nsswitch/pam_winbind.c

   1 /* pam_winbind module
   2
   3    Copyright Andrew Tridgell <tridge@samba.org> 2000
   4    Copyright Tim Potter <tpot@samba.org> 2000
   5    Copyright Andrew Bartlett <abartlet@samba.org> 2002
   6    Copyright Guenther Deschner <gd@samba.org> 2005-2008
   7
   8    largely based on pam_userdb by Cristian Gafton <gafton@redhat.com> also
   9    contains large slabs of code from pam_unix by Elliot Lee
  10    <sopwith@redhat.com> (see copyright below for full details)
  11 */
  12
  13 #include "pam_winbind.h"
  14
  15 enum pam_winbind_request_type
  16 {
  17         PAM_WINBIND_AUTHENTICATE,
  18         PAM_WINBIND_SETCRED,
  19         PAM_WINBIND_ACCT_MGMT,
  20         PAM_WINBIND_OPEN_SESSION,
  21         PAM_WINBIND_CLOSE_SESSION,
  22         PAM_WINBIND_CHAUTHTOK,
  23         PAM_WINBIND_CLEANUP
  24 };
  25
  26 static int wbc_error_to_pam_error(wbcErr status)
  27 {
  28         switch (status) {
  29                 case WBC_ERR_SUCCESS:
  30                         return PAM_SUCCESS;
  31                 case WBC_ERR_NOT_IMPLEMENTED:
  32                         return PAM_SERVICE_ERR;
  33                 case WBC_ERR_UNKNOWN_FAILURE:
  34                         break;
  35                 case WBC_ERR_NO_MEMORY:
  36                         return PAM_BUF_ERR;
  37                 case WBC_ERR_INVALID_SID:
  38                 case WBC_ERR_INVALID_PARAM:
  39                         break;
  40                 case WBC_ERR_WINBIND_NOT_AVAILABLE:
  41                         return PAM_AUTHINFO_UNAVAIL;
  42                 case WBC_ERR_DOMAIN_NOT_FOUND:
  43                         return PAM_AUTHINFO_UNAVAIL;
  44                 case WBC_ERR_INVALID_RESPONSE:
  45                         return PAM_BUF_ERR;
  46                 case WBC_ERR_NSS_ERROR:
  47                         return PAM_USER_UNKNOWN;
  48                 case WBC_ERR_AUTH_ERROR:
  49                         return PAM_AUTH_ERR;
  50                 case WBC_ERR_UNKNOWN_USER:
  51                         return PAM_USER_UNKNOWN;
  52                 case WBC_ERR_UNKNOWN_GROUP:
  53                         return PAM_USER_UNKNOWN;
  54                 case WBC_ERR_PWD_CHANGE_FAILED:
  55                         break;
  56         }
  57
  58         /* be paranoid */
  59         return PAM_AUTH_ERR;
  60 }
  61
  62 static const char *_pam_error_code_str(int err)
  63 {
  64         switch (err) {
  65                 case PAM_SUCCESS:
  66                         return "PAM_SUCCESS";
  67                 case PAM_OPEN_ERR:
  68                         return "PAM_OPEN_ERR";
  69                 case PAM_SYMBOL_ERR:
  70                         return "PAM_SYMBOL_ERR";
  71                 case PAM_SERVICE_ERR:
  72                         return "PAM_SERVICE_ERR";
  73                 case PAM_SYSTEM_ERR:
  74                         return "PAM_SYSTEM_ERR";
  75                 case PAM_BUF_ERR:
  76                         return "PAM_BUF_ERR";
  77                 case PAM_PERM_DENIED:
  78                         return "PAM_PERM_DENIED";
  79                 case PAM_AUTH_ERR:
  80                         return "PAM_AUTH_ERR";
  81                 case PAM_CRED_INSUFFICIENT:
  82                         return "PAM_CRED_INSUFFICIENT";
  83                 case PAM_AUTHINFO_UNAVAIL:
  84                         return "PAM_AUTHINFO_UNAVAIL";
  85                 case PAM_USER_UNKNOWN:
  86                         return "PAM_USER_UNKNOWN";
  87                 case PAM_MAXTRIES:
  88                         return "PAM_MAXTRIES";
  89                 case PAM_NEW_AUTHTOK_REQD:
  90                         return "PAM_NEW_AUTHTOK_REQD";
  91                 case PAM_ACCT_EXPIRED:
  92                         return "PAM_ACCT_EXPIRED";
  93                 case PAM_SESSION_ERR:
  94                         return "PAM_SESSION_ERR";
  95                 case PAM_CRED_UNAVAIL:
  96                         return "PAM_CRED_UNAVAIL";
  97                 case PAM_CRED_EXPIRED:
  98                         return "PAM_CRED_EXPIRED";
  99                 case PAM_CRED_ERR:
 100                         return "PAM_CRED_ERR";
 101                 case PAM_NO_MODULE_DATA:
 102                         return "PAM_NO_MODULE_DATA";
 103                 case PAM_CONV_ERR:
 104                         return "PAM_CONV_ERR";
 105                 case PAM_AUTHTOK_ERR:
 106                         return "PAM_AUTHTOK_ERR";
 107                 case PAM_AUTHTOK_RECOVER_ERR:
 108                         return "PAM_AUTHTOK_RECOVER_ERR";
 109                 case PAM_AUTHTOK_LOCK_BUSY:
 110                         return "PAM_AUTHTOK_LOCK_BUSY";
 111                 case PAM_AUTHTOK_DISABLE_AGING:
 112                         return "PAM_AUTHTOK_DISABLE_AGING";
 113                 case PAM_TRY_AGAIN:
 114                         return "PAM_TRY_AGAIN";
 115                 case PAM_IGNORE:
 116                         return "PAM_IGNORE";
 117                 case PAM_ABORT:
 118                         return "PAM_ABORT";
 119                 case PAM_AUTHTOK_EXPIRED:
 120                         return "PAM_AUTHTOK_EXPIRED";
 121 #ifdef PAM_MODULE_UNKNOWN
 122                 case PAM_MODULE_UNKNOWN:
 123                         return "PAM_MODULE_UNKNOWN";
 124 #endif
 125 #ifdef PAM_BAD_ITEM
 126                 case PAM_BAD_ITEM:
 127                         return "PAM_BAD_ITEM";
 128 #endif
 129 #ifdef PAM_CONV_AGAIN
 130                 case PAM_CONV_AGAIN:
 131                         return "PAM_CONV_AGAIN";
 132 #endif
 133 #ifdef PAM_INCOMPLETE
 134                 case PAM_INCOMPLETE:
 135                         return "PAM_INCOMPLETE";
 136 #endif
 137                 default:
 138                         return NULL;
 139         }
 140 }
 141
 142 #define _PAM_LOG_FUNCTION_ENTER(function, ctx) \
 143         do { \
 144                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] ENTER: " \
 145                                function " (flags: 0x%04x)", ctx->pamh, ctx->flags); \
 146                 _pam_log_state(ctx); \
 147         } while (0)
 148
 149 #define _PAM_LOG_FUNCTION_LEAVE(function, ctx, retval) \
 150         do { \
 151                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] LEAVE: " \
 152                                function " returning %d (%s)", ctx ? ctx->pamh : NULL, retval, \
 153                                _pam_error_code_str(retval)); \
 154                 _pam_log_state(ctx); \
 155         } while (0)
 156
 157 /* data tokens */
 158
 159 #define MAX_PASSWD_TRIES        3
 160
 161 #ifdef HAVE_GETTEXT
 162 static char initialized = 0;
 163
 164 static inline void textdomain_init(void);
 165 static inline void textdomain_init(void)
 166 {
 167         if (!initialized) {
 168                 bindtextdomain(MODULE_NAME, LOCALEDIR);
 169                 initialized = 1;
 170         }
 171         return;
 172 }
 173 #endif
 174
 175
 176 /* some syslogging */
 177 static void _pam_log_int(const pam_handle_t *pamh,
 178                          int err,
 179                          const char *format,
 180                          va_list args) PRINTF_ATTRIBUTE(3, 0);
 181
 182 #ifdef HAVE_PAM_VSYSLOG
 183 static void _pam_log_int(const pam_handle_t *pamh,
 184                          int err,
 185                          const char *format,
 186                          va_list args)
 187 {
 188         pam_vsyslog(pamh, err, format, args);
 189 }
 190 #else
 191 static void _pam_log_int(const pam_handle_t *pamh,
 192                          int err,
 193                          const char *format,
 194                          va_list args)
 195 {
 196         char *base = NULL;
 197         va_list args2;
 198         const char *service;
 199         int ret;
 200
 201         va_copy(args2, args);
 202
 203         pam_get_item(pamh, PAM_SERVICE, (const void **) &service);
 204
 205         ret = vasprintf(&base, format, args);
 206         if (ret == -1) {
 207                 /* what else todo ? */
 208                 vsyslog(err, format, args2);
 209                 va_end(args2);
 210                 return;
 211         }
 212
 213         syslog(err, "%s(%s): %s", MODULE_NAME, service, base);
 214         SAFE_FREE(base);
 215         va_end(args2);
 216 }
 217 #endif /* HAVE_PAM_VSYSLOG */
 218
 219 static bool _pam_log_is_silent(int ctrl)
 220 {
 221         return on(ctrl, WINBIND_SILENT);
 222 }
 223
 224 static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 225 static void _pam_log(struct pwb_context *r, int err, const char *format, ...)
 226 {
 227         va_list args;
 228
 229         if (_pam_log_is_silent(r->ctrl)) {
 230                 return;
 231         }
 232
 233         va_start(args, format);
 234         _pam_log_int(r->pamh, err, format, args);
 235         va_end(args);
 236 }
 237 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 238 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 239 {
 240         va_list args;
 241
 242         if (_pam_log_is_silent(ctrl)) {
 243                 return;
 244         }
 245
 246         va_start(args, format);
 247         _pam_log_int(pamh, err, format, args);
 248         va_end(args);
 249 }
 250
 251 static bool _pam_log_is_debug_enabled(int ctrl)
 252 {
 253         if (ctrl == -1) {
 254                 return false;
 255         }
 256
 257         if (_pam_log_is_silent(ctrl)) {
 258                 return false;
 259         }
 260
 261         if (!(ctrl & WINBIND_DEBUG_ARG)) {
 262                 return false;
 263         }
 264
 265         return true;
 266 }
 267
 268 static bool _pam_log_is_debug_state_enabled(int ctrl)
 269 {
 270         if (!(ctrl & WINBIND_DEBUG_STATE)) {
 271                 return false;
 272         }
 273
 274         return _pam_log_is_debug_enabled(ctrl);
 275 }
 276
 277 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 278 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...)
 279 {
 280         va_list args;
 281
 282         if (!r || !_pam_log_is_debug_enabled(r->ctrl)) {
 283                 return;
 284         }
 285
 286         va_start(args, format);
 287         _pam_log_int(r->pamh, err, format, args);
 288         va_end(args);
 289 }
 290 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 291 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 292 {
 293         va_list args;
 294
 295         if (!_pam_log_is_debug_enabled(ctrl)) {
 296                 return;
 297         }
 298
 299         va_start(args, format);
 300         _pam_log_int(pamh, err, format, args);
 301         va_end(args);
 302 }
 303
 304 static void _pam_log_state_datum(struct pwb_context *ctx,
 305                                  int item_type,
 306                                  const char *key,
 307                                  int is_string)
 308 {
 309         const void *data = NULL;
 310         if (item_type != 0) {
 311                 pam_get_item(ctx->pamh, item_type, &data);
 312         } else {
 313                 pam_get_data(ctx->pamh, key, &data);
 314         }
 315         if (data != NULL) {
 316                 const char *type = (item_type != 0) ? "ITEM" : "DATA";
 317                 if (is_string != 0) {
 318                         _pam_log_debug(ctx, LOG_DEBUG,
 319                                        "[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
 320                                        ctx->pamh, type, key, (const char *)data,
 321                                        data);
 322                 } else {
 323                         _pam_log_debug(ctx, LOG_DEBUG,
 324                                        "[pamh: %p] STATE: %s(%s) = %p",
 325                                        ctx->pamh, type, key, data);
 326                 }
 327         }
 328 }
 329
 330 #define _PAM_LOG_STATE_DATA_POINTER(ctx, module_data_name) \
 331         _pam_log_state_datum(ctx, 0, module_data_name, 0)
 332
 333 #define _PAM_LOG_STATE_DATA_STRING(ctx, module_data_name) \
 334         _pam_log_state_datum(ctx, 0, module_data_name, 1)
 335
 336 #define _PAM_LOG_STATE_ITEM_POINTER(ctx, item_type) \
 337         _pam_log_state_datum(ctx, item_type, #item_type, 0)
 338
 339 #define _PAM_LOG_STATE_ITEM_STRING(ctx, item_type) \
 340         _pam_log_state_datum(ctx, item_type, #item_type, 1)
 341
 342 #ifdef DEBUG_PASSWORD
 343 #define _LOG_PASSWORD_AS_STRING 1
 344 #else
 345 #define _LOG_PASSWORD_AS_STRING 0
 346 #endif
 347
 348 #define _PAM_LOG_STATE_ITEM_PASSWORD(ctx, item_type) \
 349         _pam_log_state_datum(ctx, item_type, #item_type, \
 350                              _LOG_PASSWORD_AS_STRING)
 351 /*
 352  * wrapper to preserve old behaviour of iniparser which ignored
 353  * key values that had no value assigned like
 354  *    key =
 355  * for a key like above newer iniparser will return a zero-length
 356  * string, previously iniparser would return NULL
 357  *
 358  * JRA: For compatibility, tiniparser behaves like iniparser.
 359  */
 360 static const char *tiniparser_getstring_nonempty(struct tiniparser_dictionary *d,
 361                         const char *key,
 362                         const char *def)
 363 {
 364         const char *ret = tiniparser_getstring(d, key, def);
 365         if (ret && strlen(ret) == 0) {
 366                 ret = NULL;
 367         }
 368         return ret;
 369 }
 370
 371 static void _pam_log_state(struct pwb_context *ctx)
 372 {
 373         if (!ctx || !_pam_log_is_debug_state_enabled(ctx->ctrl)) {
 374                 return;
 375         }
 376
 377         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
 378         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
 379         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
 380         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
 381         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
 382         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
 383         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
 384         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
 385         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
 386 #ifdef PAM_FAIL_DELAY
 387         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
 388 #endif
 389 #ifdef PAM_REPOSITORY
 390         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
 391 #endif
 392
 393         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
 394         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
 395         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
 396         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
 397         _PAM_LOG_STATE_DATA_STRING(ctx,
 398                                    PAM_WINBIND_NEW_AUTHTOK_REQD);
 399                                    /* Use atoi to get PAM result code */
 400         _PAM_LOG_STATE_DATA_STRING(ctx,
 401                                    PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
 402         _PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
 403 }
 404
 405 static int _pam_parse(const pam_handle_t *pamh,
 406                       int flags,
 407                       int argc,
 408                       const char **argv,
 409                       enum pam_winbind_request_type type,
 410                       struct tiniparser_dictionary **result_d)
 411 {
 412         int ctrl = 0;
 413         const char *config_file = NULL;
 414         int i;
 415         const char **v;
 416         struct tiniparser_dictionary *d = NULL;
 417
 418         if (flags & PAM_SILENT) {
 419                 ctrl |= WINBIND_SILENT;
 420         }
 421
 422         for (i=argc,v=argv; i-- > 0; ++v) {
 423                 if (!strncasecmp(*v, "config", strlen("config"))) {
 424                         ctrl |= WINBIND_CONFIG_FILE;
 425                         config_file = v[i];
 426                         break;
 427                 }
 428         }
 429
 430         if (config_file == NULL) {
 431                 config_file = PAM_WINBIND_CONFIG_FILE;
 432         }
 433
 434         d = tiniparser_load(config_file);
 435         if (d == NULL) {
 436                 goto config_from_pam;
 437         }
 438
 439         if (tiniparser_getboolean(d, "global:debug", false)) {
 440                 ctrl |= WINBIND_DEBUG_ARG;
 441         }
 442
 443         if (tiniparser_getboolean(d, "global:debug_state", false)) {
 444                 ctrl |= WINBIND_DEBUG_STATE;
 445         }
 446
 447         if (tiniparser_getboolean(d, "global:cached_login", false)) {
 448                 ctrl |= WINBIND_CACHED_LOGIN;
 449         }
 450
 451         if (tiniparser_getboolean(d, "global:krb5_auth", false)) {
 452                 ctrl |= WINBIND_KRB5_AUTH;
 453         }
 454
 455         if (tiniparser_getboolean(d, "global:silent", false)) {
 456                 ctrl |= WINBIND_SILENT;
 457         }
 458
 459         if (tiniparser_getstring_nonempty(d, "global:krb5_ccache_type", NULL) != NULL) {
 460                 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 461         }
 462
 463         if ((tiniparser_getstring_nonempty(d, "global:require-membership-of", NULL)
 464              != NULL) ||
 465             (tiniparser_getstring_nonempty(d, "global:require_membership_of", NULL)
 466              != NULL)) {
 467                 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 468         }
 469
 470         if (tiniparser_getboolean(d, "global:try_first_pass", false)) {
 471                 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 472         }
 473
 474         if (tiniparser_getint(d, "global:warn_pwd_expire", 0)) {
 475                 ctrl |= WINBIND_WARN_PWD_EXPIRE;
 476         }
 477
 478         if (tiniparser_getboolean(d, "global:mkhomedir", false)) {
 479                 ctrl |= WINBIND_MKHOMEDIR;
 480         }
 481
 482         if (tiniparser_getboolean(d, "global:pwd_change_prompt", false)) {
 483                 ctrl |= WINBIND_PWD_CHANGE_PROMPT;
 484         }
 485
 486 config_from_pam:
 487         /* step through arguments */
 488         for (i=argc,v=argv; i-- > 0; ++v) {
 489
 490                 /* generic options */
 491                 if (!strcmp(*v,"debug"))
 492                         ctrl |= WINBIND_DEBUG_ARG;
 493                 else if (!strcasecmp(*v, "debug_state"))
 494                         ctrl |= WINBIND_DEBUG_STATE;
 495                 else if (!strcasecmp(*v, "silent"))
 496                         ctrl |= WINBIND_SILENT;
 497                 else if (!strcasecmp(*v, "use_authtok"))
 498                         ctrl |= WINBIND_USE_AUTHTOK_ARG;
 499                 else if (!strcasecmp(*v, "try_authtok"))
 500                         ctrl |= WINBIND_TRY_AUTHTOK_ARG;
 501                 else if (!strcasecmp(*v, "use_first_pass"))
 502                         ctrl |= WINBIND_USE_FIRST_PASS_ARG;
 503                 else if (!strcasecmp(*v, "try_first_pass"))
 504                         ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 505                 else if (!strcasecmp(*v, "unknown_ok"))
 506                         ctrl |= WINBIND_UNKNOWN_OK_ARG;
 507                 else if ((type == PAM_WINBIND_AUTHENTICATE
 508                           || type == PAM_WINBIND_SETCRED)
 509                          && !strncasecmp(*v, "require_membership_of",
 510                                          strlen("require_membership_of")))
 511                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 512                 else if ((type == PAM_WINBIND_AUTHENTICATE
 513                           || type == PAM_WINBIND_SETCRED)
 514                          && !strncasecmp(*v, "require-membership-of",
 515                                          strlen("require-membership-of")))
 516                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 517                 else if (!strcasecmp(*v, "krb5_auth"))
 518                         ctrl |= WINBIND_KRB5_AUTH;
 519                 else if (!strncasecmp(*v, "krb5_ccache_type",
 520                                       strlen("krb5_ccache_type")))
 521                         ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 522                 else if (!strcasecmp(*v, "cached_login"))
 523                         ctrl |= WINBIND_CACHED_LOGIN;
 524                 else if (!strcasecmp(*v, "mkhomedir"))
 525                         ctrl |= WINBIND_MKHOMEDIR;
 526                 else if (!strncasecmp(*v, "warn_pwd_expire",
 527                         strlen("warn_pwd_expire")))
 528                         ctrl |= WINBIND_WARN_PWD_EXPIRE;
 529                 else if (!strcasecmp(*v, "pwd_change_prompt"))
 530                         ctrl |= WINBIND_PWD_CHANGE_PROMPT;
 531                 else if (type != PAM_WINBIND_CLEANUP) {
 532                         __pam_log(pamh, ctrl, LOG_ERR,
 533                                  "pam_parse: unknown option: %s", *v);
 534                         return -1;
 535                 }
 536
 537         }
 538
 539         if (result_d) {
 540                 *result_d = d;
 541         } else {
 542                 if (d) {
 543                         tiniparser_freedict(d);
 544                 }
 545         }
 546
 547         return ctrl;
 548 };
 549
 550 static int _pam_winbind_free_context(struct pwb_context *ctx)
 551 {
 552         if (!ctx) {
 553                 return 0;
 554         }
 555
 556         if (ctx->dict) {
 557                 tiniparser_freedict(ctx->dict);
 558         }
 559
 560         wbcCtxFree(ctx->wbc_ctx);
 561
 562         return 0;
 563 }
 564
 565 static int _pam_winbind_init_context(pam_handle_t *pamh,
 566                                      int flags,
 567                                      int argc,
 568                                      const char **argv,
 569                                      enum pam_winbind_request_type type,
 570                                      struct pwb_context **ctx_p)
 571 {
 572         struct pwb_context *r = NULL;
 573         const char *service = NULL;
 574         char service_name[32] = {0};
 575         int ctrl_code;
 576
 577 #ifdef HAVE_GETTEXT
 578         textdomain_init();
 579 #endif
 580
 581         r = talloc_zero(NULL, struct pwb_context);
 582         if (!r) {
 583                 return PAM_BUF_ERR;
 584         }
 585
 586         talloc_set_destructor(r, _pam_winbind_free_context);
 587
 588         r->pamh = pamh;
 589         r->flags = flags;
 590         r->argc = argc;
 591         r->argv = argv;
 592         ctrl_code = _pam_parse(pamh, flags, argc, argv, type, &r->dict);
 593         if (ctrl_code == -1) {
 594                 TALLOC_FREE(r);
 595                 return PAM_SYSTEM_ERR;
 596         }
 597         r->ctrl = ctrl_code;
 598
 599         r->wbc_ctx = wbcCtxCreate();
 600         if (r->wbc_ctx == NULL) {
 601                 TALLOC_FREE(r);
 602                 return PAM_SYSTEM_ERR;
 603         }
 604
 605         pam_get_item(pamh, PAM_SERVICE, (const void **)&service);
 606
 607         snprintf(service_name, sizeof(service_name), "PAM_WINBIND[%s]", service);
 608
 609         wbcSetClientProcessName(service_name);
 610
 611         *ctx_p = r;
 612
 613         return PAM_SUCCESS;
 614 }
 615
 616 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
 617                                       void *data,
 618                                       int error_status)
 619 {
 620         int ctrl = _pam_parse(pamh, 0, 0, NULL, PAM_WINBIND_CLEANUP, NULL);
 621         if (_pam_log_is_debug_state_enabled(ctrl)) {
 622                 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
 623                                "[pamh: %p] CLEAN: cleaning up PAM data %p "
 624                                "(error_status = %d)", pamh, data,
 625                                error_status);
 626         }
 627         TALLOC_FREE(data);
 628 }
 629
 630
 631 static const struct ntstatus_errors {
 632         const char *ntstatus_string;
 633         const char *error_string;
 634 } ntstatus_errors[] = {
 635         {"NT_STATUS_OK",
 636                 N_("Success")},
 637         {"NT_STATUS_BACKUP_CONTROLLER",
 638                 N_("No primary Domain Controller available")},
 639         {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
 640                 N_("No domain controllers found")},
 641         {"NT_STATUS_NO_LOGON_SERVERS",
 642                 N_("No logon servers")},
 643         {"NT_STATUS_PWD_TOO_SHORT",
 644                 N_("Password too short")},
 645         {"NT_STATUS_PWD_TOO_RECENT",
 646                 N_("The password was recently changed and cannot be changed again before %s")},
 647         {"NT_STATUS_PWD_HISTORY_CONFLICT",
 648                 N_("Password is already in password history")},
 649         {"NT_STATUS_PASSWORD_EXPIRED",
 650                 N_("Your password has expired")},
 651         {"NT_STATUS_PASSWORD_MUST_CHANGE",
 652                 N_("You need to change your password now")},
 653         {"NT_STATUS_INVALID_WORKSTATION",
 654                 N_("You are not allowed to logon from this workstation")},
 655         {"NT_STATUS_INVALID_LOGON_HOURS",
 656                 N_("You are not allowed to logon at this time")},
 657         {"NT_STATUS_ACCOUNT_EXPIRED",
 658                 N_("Your account has expired. "
 659                    "Please contact your System administrator")}, /* SCNR */
 660         {"NT_STATUS_ACCOUNT_DISABLED",
 661                 N_("Your account is disabled. "
 662                    "Please contact your System administrator")}, /* SCNR */
 663         {"NT_STATUS_ACCOUNT_LOCKED_OUT",
 664                 N_("Your account has been locked. "
 665                    "Please contact your System administrator")}, /* SCNR */
 666         {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
 667                 N_("Invalid Trust Account")},
 668         {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
 669                 N_("Invalid Trust Account")},
 670         {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
 671                 N_("Invalid Trust Account")},
 672         {"NT_STATUS_ACCESS_DENIED",
 673                 N_("Access is denied")},
 674         {NULL, NULL}
 675 };
 676
 677 static const char *_get_ntstatus_error_string(const char *nt_status_string)
 678 {
 679         int i;
 680         for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
 681                 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
 682                                 nt_status_string)) {
 683                         return _(ntstatus_errors[i].error_string);
 684                 }
 685         }
 686         return NULL;
 687 }
 688
 689 /* --- authentication management functions --- */
 690
 691 /* Attempt a conversation */
 692
 693 static int converse(const pam_handle_t *pamh,
 694                     int nargs,
 695                     const struct pam_message **message,
 696                     struct pam_response **response)
 697 {
 698         int retval;
 699         const struct pam_conv *conv;
 700
 701         retval = pam_get_item(pamh, PAM_CONV, (const void **) &conv);
 702         if (retval == PAM_SUCCESS) {
 703                 retval = conv->conv(nargs,
 704                                     discard_const_p(const struct pam_message *, message),
 705                                     response, conv->appdata_ptr);
 706         }
 707
 708         return retval; /* propagate error status */
 709 }
 710
 711
 712 static int _make_remark(struct pwb_context *ctx,
 713                         int type,
 714                         const char *text)
 715 {
 716         int retval = PAM_SUCCESS;
 717
 718         const struct pam_message *pmsg[1];
 719         struct pam_message msg[1];
 720         struct pam_response *resp;
 721
 722         if (ctx->flags & WINBIND_SILENT) {
 723                 return PAM_SUCCESS;
 724         }
 725
 726         pmsg[0] = &msg[0];
 727         msg[0].msg = discard_const_p(char, text);
 728         msg[0].msg_style = type;
 729
 730         resp = NULL;
 731         retval = converse(ctx->pamh, 1, pmsg, &resp);
 732
 733         if (resp) {
 734                 _pam_drop_reply(resp, 1);
 735         }
 736         return retval;
 737 }
 738
 739 static int _make_remark_v(struct pwb_context *ctx,
 740                           int type,
 741                           const char *format,
 742                           va_list args) PRINTF_ATTRIBUTE(3, 0);
 743
 744 static int _make_remark_v(struct pwb_context *ctx,
 745                           int type,
 746                           const char *format,
 747                           va_list args)
 748 {
 749         char *var;
 750         int ret;
 751
 752         ret = vasprintf(&var, format, args);
 753         if (ret < 0) {
 754                 _pam_log(ctx, LOG_ERR, "memory allocation failure");
 755                 return ret;
 756         }
 757
 758         ret = _make_remark(ctx, type, var);
 759         SAFE_FREE(var);
 760         return ret;
 761 }
 762
 763 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 764 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
 765 {
 766         int ret;
 767         va_list args;
 768
 769         va_start(args, format);
 770         ret = _make_remark_v(ctx, type, format, args);
 771         va_end(args);
 772         return ret;
 773 }
 774
 775 static int pam_winbind_request_log(struct pwb_context *ctx,
 776                                    int retval,
 777                                    const char *user,
 778                                    const char *fn)
 779 {
 780         switch (retval) {
 781         case PAM_AUTH_ERR:
 782                 /* incorrect password */
 783                 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
 784                          "(incorrect password or invalid membership)", user);
 785                 return retval;
 786         case PAM_ACCT_EXPIRED:
 787                 /* account expired */
 788                 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
 789                          user);
 790                 return retval;
 791         case PAM_AUTHTOK_EXPIRED:
 792                 /* password expired */
 793                 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
 794                          user);
 795                 return retval;
 796         case PAM_NEW_AUTHTOK_REQD:
 797                 /* new password required */
 798                 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
 799                          "required", user);
 800                 return retval;
 801         case PAM_USER_UNKNOWN:
 802                 /* the user does not exist */
 803                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
 804                                user);
 805                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
 806                         return PAM_IGNORE;
 807                 }
 808                 return retval;
 809         case PAM_AUTHTOK_ERR:
 810                 /* Authentication token manipulation error */
 811                 _pam_log(ctx, LOG_WARNING, "user `%s' authentication token change failed "
 812                         "(pwd complexity/history/min_age not met?)", user);
 813                 return retval;
 814         case PAM_SUCCESS:
 815                 /* Otherwise, the authentication looked good */
 816                 if (strcmp(fn, "wbcLogonUser") == 0) {
 817                         _pam_log(ctx, LOG_NOTICE,
 818                                  "user '%s' granted access", user);
 819                 } else {
 820                         _pam_log(ctx, LOG_NOTICE,
 821                                  "user '%s' OK", user);
 822                 }
 823                 return retval;
 824         default:
 825                 /* we don't know anything about this return value */
 826                 _pam_log(ctx, LOG_ERR,
 827                          "internal module error (retval = %s(%d), user = '%s')",
 828                         _pam_error_code_str(retval), retval, user);
 829                 return retval;
 830         }
 831 }
 832
 833 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
 834                                        struct wbcAuthErrorInfo *e,
 835                                        wbcErr status,
 836                                        const char *username,
 837                                        const char *fn)
 838 {
 839         int ret = PAM_AUTH_ERR;
 840
 841         if (WBC_ERROR_IS_OK(status)) {
 842                 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
 843                         fn);
 844                 ret = PAM_SUCCESS;
 845                 return pam_winbind_request_log(ctx, ret, username, fn);
 846         }
 847
 848         if (e) {
 849                 if (e->pam_error != PAM_SUCCESS) {
 850                         _pam_log(ctx, LOG_ERR,
 851                                  "request %s failed: %s, "
 852                                  "PAM error: %s (%d), NTSTATUS: %s, "
 853                                  "Error message was: %s",
 854                                  fn,
 855                                  wbcErrorString(status),
 856                                  _pam_error_code_str(e->pam_error),
 857                                  e->pam_error,
 858                                  e->nt_string,
 859                                  e->display_string);
 860                         ret = e->pam_error;
 861                         return pam_winbind_request_log(ctx, ret, username, fn);
 862                 }
 863
 864                 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
 865
 866                 ret = PAM_SERVICE_ERR;
 867                 return pam_winbind_request_log(ctx, ret, username, fn);
 868         }
 869
 870         ret = wbc_error_to_pam_error(status);
 871         _pam_log(ctx, LOG_ERR,
 872                  "request %s failed: %s, PAM error: %s (%d)!",
 873                  fn, wbcErrorString(status),
 874                  _pam_error_code_str(ret), ret);
 875         return pam_winbind_request_log(ctx, ret, username, fn);
 876 }
 877
 878 #if defined(HAVE_PAM_RADIO_TYPE)
 879 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 880 {
 881         struct pam_message msg;
 882         const struct pam_message *pmsg;
 883         struct pam_response *resp = NULL;
 884         int ret;
 885         bool retval = false;
 886         pmsg = &msg;
 887         msg.msg_style = PAM_RADIO_TYPE;
 888         msg.msg = _("Do you want to change your password now?");
 889         ret = converse(ctx->pamh, 1, &pmsg, &resp);
 890         if (resp == NULL) {
 891                 if (ret == PAM_SUCCESS) {
 892                         _pam_log(ctx, LOG_CRIT, "pam_winbind: system error!\n");
 893                         return false;
 894                 }
 895         }
 896         if (ret != PAM_SUCCESS) {
 897                 return false;
 898         }
 899         _pam_log(ctx, LOG_CRIT, "Received [%s] reply from application.\n", resp->resp);
 900
 901         if ((resp->resp != NULL) && (strcasecmp(resp->resp, "yes") == 0)) {
 902                 retval = true;
 903         }
 904
 905         _pam_drop_reply(resp, 1);
 906         return retval;
 907 }
 908 #else
 909 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 910 {
 911         return false;
 912 }
 913 #endif
 914
 915 /**
 916  * send a password expiry message if required
 917  *
 918  * @param ctx PAM winbind context.
 919  * @param next_change expected (calculated) next expiry date.
 920  * @param already_expired pointer to a boolean to indicate if the password is
 921  *        already expired.
 922  *
 923  * @return boolean Returns true if message has been sent, false if not.
 924  */
 925
 926 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
 927                                               time_t next_change,
 928                                               time_t now,
 929                                               int warn_pwd_expire,
 930                                               bool *already_expired,
 931                                               bool *change_pwd)
 932 {
 933         int days = 0;
 934         struct tm tm_now, tm_next_change;
 935         bool retval = false;
 936         int ret;
 937
 938         if (already_expired) {
 939                 *already_expired = false;
 940         }
 941
 942         if (change_pwd) {
 943                 *change_pwd = false;
 944         }
 945
 946         if (next_change <= now) {
 947                 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
 948                 if (already_expired) {
 949                         *already_expired = true;
 950                 }
 951                 return true;
 952         }
 953
 954         if ((next_change < 0) ||
 955             (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
 956                 return false;
 957         }
 958
 959         if ((localtime_r(&now, &tm_now) == NULL) ||
 960             (localtime_r(&next_change, &tm_next_change) == NULL)) {
 961                 return false;
 962         }
 963
 964         days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
 965                (tm_now.tm_yday+tm_now.tm_year*365);
 966
 967         if (days == 0) {
 968                 ret = _make_remark(ctx, PAM_TEXT_INFO,
 969                                 _("Your password expires today.\n"));
 970
 971                 /*
 972                  * If change_pwd and already_expired is null.
 973                  * We are just sending a notification message.
 974                  * We don't expect any response in this case.
 975                  */
 976
 977                 if (!change_pwd && !already_expired) {
 978                         return true;
 979                 }
 980
 981                 /*
 982                  * successfully sent the warning message.
 983                  * Give the user a chance to change pwd.
 984                  */
 985                 if (ret == PAM_SUCCESS &&
 986                     (ctx->ctrl & WINBIND_PWD_CHANGE_PROMPT)) {
 987                         if (change_pwd) {
 988                                 retval = _pam_winbind_change_pwd(ctx);
 989                                 if (retval) {
 990                                         *change_pwd = true;
 991                                 }
 992                         }
 993                 }
 994                 return true;
 995         }
 996
 997         if (days > 0 && days < warn_pwd_expire) {
 998
 999                 ret = _make_remark_format(ctx, PAM_TEXT_INFO,
1000                                         _("Your password will expire in %d %s.\n"),
1001                                         days, (days > 1) ? _("days"):_("day"));
1002                 /*
1003                  * If change_pwd and already_expired is null.
1004                  * We are just sending a notification message.
1005                  * We don't expect any response in this case.
1006                  */
1007
1008                 if (!change_pwd && !already_expired) {
1009                         return true;
1010                 }
1011
1012                 /*
1013                  * successfully sent the warning message.
1014                  * Give the user a chance to change pwd.
1015                  */
1016                 if (ret == PAM_SUCCESS &&
1017                     (ctx->ctrl & WINBIND_PWD_CHANGE_PROMPT)) {
1018                         if (change_pwd) {
1019                                 retval = _pam_winbind_change_pwd(ctx);
1020                                 if (retval) {
1021                                         *change_pwd = true;
1022                                 }
1023                         }
1024                 }
1025                 return true;
1026         }
1027
1028         return false;
1029 }
1030
1031 /**
1032  * Send a warning if the password expires in the near future
1033  *
1034  * @param ctx PAM winbind context.
1035  * @param response The full authentication response structure.
1036  * @param already_expired boolean, is the pwd already expired?
1037  *
1038  * @return void.
1039  */
1040
1041 static void _pam_warn_password_expiry(struct pwb_context *ctx,
1042                                       const struct wbcAuthUserInfo *info,
1043                                       int warn_pwd_expire,
1044                                       bool *already_expired,
1045                                       bool *change_pwd)
1046 {
1047         time_t now = time(NULL);
1048         time_t next_change = 0;
1049
1050         if (info == NULL) {
1051                 return;
1052         }
1053
1054         if (already_expired) {
1055                 *already_expired = false;
1056         }
1057
1058         if (change_pwd) {
1059                 *change_pwd = false;
1060         }
1061
1062         /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
1063         if (info->acct_flags & WBC_ACB_PWNOEXP) {
1064                 return;
1065         }
1066
1067         /* no point in sending a warning if this is a grace logon */
1068         if (PAM_WB_GRACE_LOGON(info->user_flags)) {
1069                 return;
1070         }
1071
1072         /* check if the info3 must change timestamp has been set */
1073         next_change = info->pass_must_change_time;
1074
1075         if (_pam_send_password_expiry_message(ctx, next_change, now,
1076                                               warn_pwd_expire,
1077                                               already_expired,
1078                                               change_pwd)) {
1079                 return;
1080         }
1081
1082         /* no warning sent */
1083 }
1084
1085 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
1086
1087 /**
1088  * Append a string, making sure not to overflow and to always return a
1089  * NULL-terminated string.
1090  *
1091  * @param dest Destination string buffer (must already be NULL-terminated).
1092  * @param src Source string buffer.
1093  * @param dest_buffer_size Size of dest buffer in bytes.
1094  *
1095  * @return false if dest buffer is not big enough (no bytes copied), true on
1096  * success.
1097  */
1098
1099 static bool safe_append_string(char *dest,
1100                                const char *src,
1101                                int dest_buffer_size)
1102 {
1103         size_t len;
1104         len = strlcat(dest, src, dest_buffer_size);
1105         return (len < dest_buffer_size);
1106 }
1107
1108 /**
1109  * Convert a names into a SID string, appending it to a buffer.
1110  *
1111  * @param ctx PAM winbind context.
1112  * @param user User in PAM request.
1113  * @param name Name to convert.
1114  * @param sid_list_buffer Where to append the string sid.
1115  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1116  *
1117  * @return false on failure, true on success.
1118  */
1119 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
1120                                        const char *user,
1121                                        const char *name,
1122                                        char *sid_list_buffer,
1123                                        int sid_list_buffer_size)
1124 {
1125         char sid_string[WBC_SID_STRING_BUFLEN];
1126
1127         /* lookup name? */
1128         if (IS_SID_STRING(name)) {
1129                 strlcpy(sid_string, name, sizeof(sid_string));
1130         } else {
1131                 wbcErr wbc_status;
1132                 struct wbcDomainSid sid;
1133                 enum wbcSidType type;
1134
1135                 _pam_log_debug(ctx, LOG_DEBUG,
1136                                "no sid given, looking up: %s\n", name);
1137
1138                 wbc_status = wbcCtxLookupName(ctx->wbc_ctx,
1139                                               "",
1140                                               name,
1141                                               &sid,
1142                                               &type);
1143                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1144                         _pam_log(ctx, LOG_INFO,
1145                                  "could not lookup name: %s\n", name);
1146                         return false;
1147                 }
1148
1149                 wbcSidToStringBuf(&sid, sid_string, sizeof(sid_string));
1150         }
1151
1152         if (!safe_append_string(sid_list_buffer, sid_string,
1153                                 sid_list_buffer_size)) {
1154                 return false;
1155         }
1156         return true;
1157 }
1158
1159 /**
1160  * Convert a list of names into a list of sids.
1161  *
1162  * @param ctx PAM winbind context.
1163  * @param user User in PAM request.
1164  * @param name_list List of names or string sids, separated by commas.
1165  * @param sid_list_buffer Where to put the list of string sids.
1166  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1167  *
1168  * @return false on failure, true on success.
1169  */
1170 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1171                                                  const char *user,
1172                                                  const char *name_list,
1173                                                  char *sid_list_buffer,
1174                                                  int sid_list_buffer_size)
1175 {
1176         bool result = false;
1177         char *current_name = NULL;
1178         const char *search_location;
1179         const char *comma;
1180         int len;
1181
1182         if (sid_list_buffer_size > 0) {
1183                 sid_list_buffer[0] = 0;
1184         }
1185
1186         search_location = name_list;
1187         while ((comma = strchr(search_location, ',')) != NULL) {
1188                 current_name = strndup(search_location,
1189                                        comma - search_location);
1190                 if (NULL == current_name) {
1191                         goto out;
1192                 }
1193
1194                 if (!winbind_name_to_sid_string(ctx, user,
1195                                                 current_name,
1196                                                 sid_list_buffer,
1197                                                 sid_list_buffer_size)) {
1198                         /*
1199                          * If one group name failed, we must not fail
1200                          * the authentication totally, continue with
1201                          * the following group names. If user belongs to
1202                          * one of the valid groups, we must allow it
1203                          * login. -- BoYang
1204                          */
1205
1206                         _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1207                                  "check if group %s is valid group.", current_name,
1208                                  current_name);
1209                         _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1210                                         "to sid, please contact your administrator to see "
1211                                         "if group %s is valid."), current_name, current_name);
1212                         SAFE_FREE(current_name);
1213                         search_location = comma + 1;
1214                         continue;
1215                 }
1216
1217                 SAFE_FREE(current_name);
1218
1219                 if (!safe_append_string(sid_list_buffer, ",",
1220                                         sid_list_buffer_size)) {
1221                         goto out;
1222                 }
1223
1224                 search_location = comma + 1;
1225         }
1226
1227         if (!winbind_name_to_sid_string(ctx, user, search_location,
1228                                         sid_list_buffer,
1229                                         sid_list_buffer_size)) {
1230                 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1231                          "check if group %s is valid group.", search_location,
1232                          search_location);
1233                 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1234                                 "to sid, please contact your administrator to see "
1235                                 "if group %s is valid."), search_location, search_location);
1236
1237                 /* If no valid groups were converted we should fail outright */
1238                 if (name_list != NULL && strlen(sid_list_buffer) == 0) {
1239                         result = false;
1240                         goto out;
1241                 }
1242                 /*
1243                  * The lookup of the last name failed..
1244                  * It results in require_member_of_sid ends with ','
1245                  * It is malformatted parameter here, overwrite the last ','.
1246                  */
1247                 len = strlen(sid_list_buffer);
1248                 if ((len != 0) && (sid_list_buffer[len - 1] == ',')) {
1249                         sid_list_buffer[len - 1] = '\0';
1250                 }
1251         }
1252
1253         result = true;
1254
1255 out:
1256         SAFE_FREE(current_name);
1257         return result;
1258 }
1259
1260 /**
1261  * put krb5ccname variable into environment
1262  *
1263  * @param ctx PAM winbind context.
1264  * @param krb5ccname env variable retrieved from winbindd.
1265  *
1266  * @return void.
1267  */
1268
1269 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1270                                 struct wbcLogonUserInfo *info)
1271 {
1272         char *var = NULL;
1273         int ret;
1274         uint32_t i;
1275         const char *krb5ccname = NULL;
1276
1277         if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1278                 return;
1279         }
1280
1281         if (!info) {
1282                 return;
1283         }
1284
1285         for (i=0; i < info->num_blobs; i++) {
1286                 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1287                         krb5ccname = (const char *)info->blobs[i].blob.data;
1288                         break;
1289                 }
1290         }
1291
1292         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1293                 return;
1294         }
1295
1296         _pam_log_debug(ctx, LOG_DEBUG,
1297                        "request returned KRB5CCNAME: %s", krb5ccname);
1298
1299         if (asprintf(&var, "KRB5CCNAME=%s", krb5ccname) == -1) {
1300                 return;
1301         }
1302
1303         ret = pam_putenv(ctx->pamh, var);
1304         if (ret != PAM_SUCCESS) {
1305                 _pam_log(ctx, LOG_ERR,
1306                          "failed to set KRB5CCNAME to %s: %s",
1307                          var, pam_strerror(ctx->pamh, ret));
1308         }
1309         free(var);
1310 }
1311
1312 /**
1313  * Copy unix username if available (further processed in PAM).
1314  *
1315  * @param ctx PAM winbind context
1316  * @param user_ret A pointer that holds a pointer to a string
1317  * @param unix_username A username
1318  *
1319  * @return void.
1320  */
1321
1322 static void _pam_setup_unix_username(struct pwb_context *ctx,
1323                                      char **user_ret,
1324                                      struct wbcLogonUserInfo *info)
1325 {
1326         const char *unix_username = NULL;
1327         uint32_t i;
1328
1329         if (!user_ret || !info) {
1330                 return;
1331         }
1332
1333         for (i=0; i < info->num_blobs; i++) {
1334                 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1335                         unix_username = (const char *)info->blobs[i].blob.data;
1336                         break;
1337                 }
1338         }
1339
1340         if (!unix_username || !unix_username[0]) {
1341                 return;
1342         }
1343
1344         *user_ret = strdup(unix_username);
1345 }
1346
1347 /**
1348  * Set string into the PAM stack.
1349  *
1350  * @param ctx PAM winbind context.
1351  * @param data_name Key name for pam_set_data.
1352  * @param value String value.
1353  *
1354  * @return void.
1355  */
1356
1357 static void _pam_set_data_string(struct pwb_context *ctx,
1358                                  const char *data_name,
1359                                  const char *value)
1360 {
1361         int ret;
1362
1363         if (!data_name || !value || (strlen(data_name) == 0) ||
1364              (strlen(value) == 0)) {
1365                 return;
1366         }
1367
1368         ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1369                            _pam_winbind_cleanup_func);
1370         if (ret != PAM_SUCCESS) {
1371                 _pam_log_debug(ctx, LOG_DEBUG,
1372                                "Could not set data %s: %s\n",
1373                                data_name, pam_strerror(ctx->pamh, ret));
1374         }
1375 }
1376
1377 /**
1378  * Set info3 strings into the PAM stack.
1379  *
1380  * @param ctx PAM winbind context.
1381  * @param data_name Key name for pam_set_data.
1382  * @param value String value.
1383  *
1384  * @return void.
1385  */
1386
1387 static void _pam_set_data_info3(struct pwb_context *ctx,
1388                                 const struct wbcAuthUserInfo *info)
1389 {
1390         if (info != NULL) {
1391                 _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1392                              info->home_directory);
1393                 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1394                              info->logon_script);
1395                 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1396                              info->logon_server);
1397                 _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1398                              info->profile_path);
1399         }
1400 }
1401
1402 /**
1403  * Free info3 strings in the PAM stack.
1404  *
1405  * @param pamh PAM handle
1406  *
1407  * @return void.
1408  */
1409
1410 static void _pam_free_data_info3(pam_handle_t *pamh)
1411 {
1412         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1413         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1414         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1415         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1416 }
1417
1418 /**
1419  * Send PAM_ERROR_MSG for cached or grace logons.
1420  *
1421  * @param ctx PAM winbind context.
1422  * @param username User in PAM request.
1423  * @param info3_user_flgs Info3 flags containing logon type bits.
1424  *
1425  * @return void.
1426  */
1427
1428 static void _pam_warn_logon_type(struct pwb_context *ctx,
1429                                  const char *username,
1430                                  uint32_t info3_user_flgs)
1431 {
1432         /* inform about logon type */
1433         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1434
1435                 _make_remark(ctx, PAM_ERROR_MSG,
1436                              _("Grace login. "
1437                                "Please change your password as soon you're "
1438                                "online again"));
1439                 _pam_log_debug(ctx, LOG_DEBUG,
1440                                "User %s logged on using grace logon\n",
1441                                username);
1442
1443         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1444
1445                 _make_remark(ctx, PAM_ERROR_MSG,
1446                              _("Domain Controller unreachable, "
1447                                "using cached credentials instead. "
1448                                "Network resources may be unavailable"));
1449                 _pam_log_debug(ctx, LOG_DEBUG,
1450                                "User %s logged on using cached credentials\n",
1451                                username);
1452         }
1453 }
1454
1455 /**
1456  * Send PAM_ERROR_MSG for krb5 errors.
1457  *
1458  * @param ctx PAM winbind context.
1459  * @param username User in PAM request.
1460  * @param info3_user_flgs Info3 flags containing logon type bits.
1461  *
1462  * @return void.
1463  */
1464
1465 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1466                                    const char *username,
1467                                    uint32_t info3_user_flgs)
1468 {
1469         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1470                 _make_remark(ctx, PAM_ERROR_MSG,
1471                              _("Failed to establish your Kerberos Ticket cache "
1472                                "due time differences\n"
1473                                "with the domain controller.  "
1474                                "Please verify the system time.\n"));
1475                 _pam_log_debug(ctx, LOG_DEBUG,
1476                                "User %s: Clock skew when getting Krb5 TGT\n",
1477                                username);
1478         }
1479 }
1480
1481 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1482                                        const struct wbcAuthErrorInfo *e,
1483                                        const char *nt_status_string,
1484                                        int *pam_err)
1485 {
1486         const char *ntstatus = NULL;
1487         const char *error_string = NULL;
1488
1489         if (!e || !pam_err) {
1490                 return false;
1491         }
1492
1493         ntstatus = e->nt_string;
1494         if (!ntstatus) {
1495                 return false;
1496         }
1497
1498         if (strcasecmp(ntstatus, nt_status_string) == 0) {
1499
1500                 error_string = _get_ntstatus_error_string(nt_status_string);
1501                 if (error_string) {
1502                         _make_remark(ctx, PAM_ERROR_MSG, error_string);
1503                         *pam_err = e->pam_error;
1504                         return true;
1505                 }
1506
1507                 if (e->display_string) {
1508                         _make_remark(ctx, PAM_ERROR_MSG, _(e->display_string));
1509                         *pam_err = e->pam_error;
1510                         return true;
1511                 }
1512
1513                 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1514                 *pam_err = e->pam_error;
1515
1516                 return true;
1517         }
1518
1519         return false;
1520 };
1521
1522 /**
1523  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1524  *
1525  * @param i The wbcUserPasswordPolicyInfo struct.
1526  *
1527  * @return string (caller needs to talloc_free).
1528  */
1529
1530 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1531                                                  struct wbcUserPasswordPolicyInfo *i)
1532 {
1533         char *str = NULL;
1534
1535         if (!i) {
1536                 goto failed;
1537         }
1538
1539         str = talloc_asprintf(ctx, _("Your password "));
1540         if (!str) {
1541                 goto failed;
1542         }
1543
1544         if (i->min_length_password > 0) {
1545                 str = talloc_asprintf_append(str,
1546                                _("must be at least %d characters; "),
1547                                i->min_length_password);
1548                 if (!str) {
1549                         goto failed;
1550                 }
1551         }
1552
1553         if (i->password_history > 0) {
1554                 str = talloc_asprintf_append(str,
1555                                _("cannot repeat any of your previous %d "
1556                                 "passwords; "),
1557                                i->password_history);
1558                 if (!str) {
1559                         goto failed;
1560                 }
1561         }
1562
1563         if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1564                 str = talloc_asprintf_append(str,
1565                                _("must contain capitals, numerals "
1566                                  "or punctuation; "
1567                                  "and cannot contain your account "
1568                                  "or full name; "));
1569                 if (!str) {
1570                         goto failed;
1571                 }
1572         }
1573
1574         str = talloc_asprintf_append(str,
1575                        _("Please type a different password. "
1576                          "Type a password which meets these requirements in "
1577                          "both text boxes."));
1578         if (!str) {
1579                 goto failed;
1580         }
1581
1582         return str;
1583
1584  failed:
1585         TALLOC_FREE(str);
1586         return NULL;
1587 }
1588
1589 static int _pam_create_homedir(struct pwb_context *ctx,
1590                                const char *dirname,
1591                                mode_t mode)
1592 {
1593         int ret;
1594
1595         ret = mkdir(dirname, mode);
1596         if (ret != 0 && errno == EEXIST) {
1597                 struct stat sbuf;
1598
1599                 ret = stat(dirname, &sbuf);
1600                 if (ret != 0) {
1601                         return PAM_PERM_DENIED;
1602                 }
1603
1604                 if (!S_ISDIR(sbuf.st_mode)) {
1605                         return PAM_PERM_DENIED;
1606                 }
1607         }
1608
1609         if (ret != 0) {
1610                 _make_remark_format(ctx, PAM_TEXT_INFO,
1611                                     _("Creating directory: %s failed: %s"),
1612                                     dirname, strerror(errno));
1613                 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1614                  dirname, strerror(errno));
1615                  return PAM_PERM_DENIED;
1616         }
1617
1618         return PAM_SUCCESS;
1619 }
1620
1621 static int _pam_chown_homedir(struct pwb_context *ctx,
1622                               const char *dirname,
1623                               uid_t uid,
1624                               gid_t gid)
1625 {
1626         if (chown(dirname, uid, gid) != 0) {
1627                 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1628                          dirname, strerror(errno));
1629                 return PAM_PERM_DENIED;
1630         }
1631
1632         return PAM_SUCCESS;
1633 }
1634
1635 static int _pam_mkhomedir(struct pwb_context *ctx)
1636 {
1637         struct passwd *pwd = NULL;
1638         char *token = NULL;
1639         char *create_dir = NULL;
1640         char *user_dir = NULL;
1641         int ret;
1642         const char *username;
1643         mode_t mode = 0700;
1644         char *safe_ptr = NULL;
1645         char *p = NULL;
1646
1647         /* Get the username */
1648         ret = pam_get_user(ctx->pamh, &username, NULL);
1649         if ((ret != PAM_SUCCESS) || (!username)) {
1650                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1651                 return PAM_SERVICE_ERR;
1652         }
1653
1654         pwd = getpwnam(username);
1655         if (pwd == NULL) {
1656                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1657                 return PAM_USER_UNKNOWN;
1658         }
1659         _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1660
1661         ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1662         if (ret == PAM_SUCCESS) {
1663                 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1664                                          pwd->pw_uid,
1665                                          pwd->pw_gid);
1666         }
1667
1668         if (ret == PAM_SUCCESS) {
1669                 return ret;
1670         }
1671
1672         /* maybe we need to create parent dirs */
1673         create_dir = talloc_strdup(ctx, "/");
1674         if (!create_dir) {
1675                 return PAM_BUF_ERR;
1676         }
1677
1678         /* find final directory */
1679         user_dir = strrchr(pwd->pw_dir, '/');
1680         if (!user_dir) {
1681                 return PAM_BUF_ERR;
1682         }
1683         user_dir++;
1684
1685         _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1686
1687         p = pwd->pw_dir;
1688
1689         while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1690
1691                 mode = 0755;
1692
1693                 p = NULL;
1694
1695                 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1696
1697                 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1698                 if (!create_dir) {
1699                         return PAM_BUF_ERR;
1700                 }
1701                 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1702
1703                 if (strcmp(token, user_dir) == 0) {
1704                         _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1705                         mode = 0700;
1706                 }
1707
1708                 ret = _pam_create_homedir(ctx, create_dir, mode);
1709                 if (ret != PAM_SUCCESS) {
1710                         return ret;
1711                 }
1712         }
1713
1714         return _pam_chown_homedir(ctx, create_dir,
1715                                   pwd->pw_uid,
1716                                   pwd->pw_gid);
1717 }
1718
1719 /* talk to winbindd */
1720 static int winbind_auth_request(struct pwb_context *ctx,
1721                                 const char *user,
1722                                 const char *pass,
1723                                 const char *member,
1724                                 const char *cctype,
1725                                 const int warn_pwd_expire,
1726                                 struct wbcAuthErrorInfo **p_error,
1727                                 struct wbcLogonUserInfo **p_info,
1728                                 time_t *pwd_last_set,
1729                                 char **user_ret)
1730 {
1731         wbcErr wbc_status;
1732         struct wbcLogonUserParams logon;
1733         char membership_of[1024];
1734         uid_t user_uid = -1;
1735         uint32_t flags = WBFLAG_PAM_INFO3_TEXT;
1736         struct wbcLogonUserInfo *info = NULL;
1737         struct wbcAuthUserInfo *user_info = NULL;
1738         struct wbcAuthErrorInfo *error = NULL;
1739         int ret = PAM_AUTH_ERR;
1740         int i;
1741         const char *codes[] = {
1742                 "NT_STATUS_PASSWORD_EXPIRED",
1743                 "NT_STATUS_PASSWORD_MUST_CHANGE",
1744                 "NT_STATUS_INVALID_WORKSTATION",
1745                 "NT_STATUS_INVALID_LOGON_HOURS",
1746                 "NT_STATUS_ACCOUNT_EXPIRED",
1747                 "NT_STATUS_ACCOUNT_DISABLED",
1748                 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1749                 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1750                 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1751                 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1752                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1753                 "NT_STATUS_NO_LOGON_SERVERS",
1754                 "NT_STATUS_WRONG_PASSWORD",
1755                 "NT_STATUS_ACCESS_DENIED"
1756         };
1757
1758         if (pwd_last_set) {
1759                 *pwd_last_set = 0;
1760         }
1761
1762         /* Krb5 auth always has to go against the KDC of the user's realm */
1763
1764         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1765                 flags           |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1766         }
1767
1768         if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1769                 struct passwd *pwd = NULL;
1770
1771                 pwd = getpwnam(user);
1772                 if (pwd == NULL) {
1773                         return PAM_USER_UNKNOWN;
1774                 }
1775                 user_uid        = pwd->pw_uid;
1776         }
1777
1778         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1779
1780                 _pam_log_debug(ctx, LOG_DEBUG,
1781                                "enabling krb5 login flag\n");
1782
1783                 flags           |= WBFLAG_PAM_KRB5 |
1784                                    WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1785         }
1786
1787         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1788                 _pam_log_debug(ctx, LOG_DEBUG,
1789                                "enabling cached login flag\n");
1790                 flags           |= WBFLAG_PAM_CACHED_LOGIN;
1791         }
1792
1793         if (user_ret) {
1794                 *user_ret = NULL;
1795                 flags           |= WBFLAG_PAM_UNIX_NAME;
1796         }
1797
1798         if (cctype != NULL) {
1799                 _pam_log_debug(ctx, LOG_DEBUG,
1800                                "enabling request for a %s krb5 ccache\n",
1801                                cctype);
1802         }
1803
1804         if (member != NULL) {
1805
1806                 ZERO_STRUCT(membership_of);
1807
1808                 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1809                                                           membership_of,
1810                                                           sizeof(membership_of))) {
1811                         _pam_log_debug(ctx, LOG_ERR,
1812                                        "failed to serialize membership of sid "
1813                                        "\"%s\"\n", member);
1814                         return PAM_AUTH_ERR;
1815                 }
1816         }
1817
1818         ZERO_STRUCT(logon);
1819
1820         logon.username                  = user;
1821         logon.password                  = pass;
1822
1823         if (cctype) {
1824                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1825                                              &logon.blobs,
1826                                              "krb5_cc_type",
1827                                              0,
1828                                              discard_const_p(uint8_t, cctype),
1829                                              strlen(cctype)+1);
1830                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1831                         goto done;
1832                 }
1833         }
1834
1835         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1836                                      &logon.blobs,
1837                                      "flags",
1838                                      0,
1839                                      (uint8_t *)&flags,
1840                                      sizeof(flags));
1841         if (!WBC_ERROR_IS_OK(wbc_status)) {
1842                 goto done;
1843         }
1844
1845         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1846                                      &logon.blobs,
1847                                      "user_uid",
1848                                      0,
1849                                      (uint8_t *)&user_uid,
1850                                      sizeof(user_uid));
1851         if (!WBC_ERROR_IS_OK(wbc_status)) {
1852                 goto done;
1853         }
1854
1855         if (member) {
1856                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1857                                              &logon.blobs,
1858                                              "membership_of",
1859                                              0,
1860                                              (uint8_t *)membership_of,
1861                                              sizeof(membership_of));
1862                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1863                         goto done;
1864                 }
1865         }
1866
1867         wbc_status = wbcCtxLogonUser(ctx->wbc_ctx,
1868                                      &logon,
1869                                      &info,
1870                                      &error,
1871                                      NULL);
1872         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1873                                           user, "wbcLogonUser");
1874         wbcFreeMemory(logon.blobs);
1875         logon.blobs = NULL;
1876
1877         if (info && info->info) {
1878                 user_info = info->info;
1879         }
1880
1881         if (pwd_last_set && user_info) {
1882                 *pwd_last_set = user_info->pass_last_set_time;
1883         }
1884
1885         if (p_info && info) {
1886                 *p_info = info;
1887         }
1888
1889         if (p_error && error) {
1890                 /* We want to process the error in the caller. */
1891                 *p_error = error;
1892                 return ret;
1893         }
1894
1895         for (i=0; i<ARRAY_SIZE(codes); i++) {
1896                 int _ret = ret;
1897                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1898                         ret = _ret;
1899                         goto done;
1900                 }
1901         }
1902
1903         if ((ret == PAM_SUCCESS) && user_info && info) {
1904
1905                 bool already_expired = false;
1906                 bool change_pwd = false;
1907
1908                 /* warn a user if the password is about to expire soon */
1909                 _pam_warn_password_expiry(ctx, user_info,
1910                                           warn_pwd_expire,
1911                                           &already_expired,
1912                                           &change_pwd);
1913
1914                 if (already_expired == true) {
1915
1916                         SMB_TIME_T last_set = user_info->pass_last_set_time;
1917                         SMB_TIME_T must_set = user_info->pass_must_change_time;
1918
1919                         _pam_log_debug(ctx, LOG_DEBUG,
1920                                        "Password has expired "
1921                                        "(Password was last set: %lld, "
1922                                        "it must be changed here "
1923                                        "%lld (now it's: %ld))\n",
1924                                        (long long int)last_set,
1925                                        (long long int)must_set,
1926                                        (long)time(NULL));
1927
1928                         return PAM_AUTHTOK_EXPIRED;
1929                 }
1930
1931                 if (change_pwd) {
1932                         ret = PAM_NEW_AUTHTOK_REQD;
1933                         goto done;
1934                 }
1935
1936                 /* inform about logon type */
1937                 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1938
1939                 /* inform about krb5 failures */
1940                 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1941
1942                 /* set some info3 info for other modules in the stack */
1943                 _pam_set_data_info3(ctx, user_info);
1944
1945                 /* put krb5ccname into env */
1946                 _pam_setup_krb5_env(ctx, info);
1947
1948                 /* If winbindd returned a username, return the pointer to it
1949                  * here. */
1950                 _pam_setup_unix_username(ctx, user_ret, info);
1951         }
1952
1953  done:
1954         wbcFreeMemory(logon.blobs);
1955         if (info && info->blobs && !p_info) {
1956                 wbcFreeMemory(info->blobs);
1957                 /*
1958                  * We set blobs to NULL to prevent a use after free in the
1959                  * in the wbcLogonUserInfoDestructor
1960                  */
1961                 info->blobs = NULL;
1962         }
1963         if (error && !p_error) {
1964                 wbcFreeMemory(error);
1965         }
1966         if (info && !p_info) {
1967                 wbcFreeMemory(info);
1968         }
1969
1970         return ret;
1971 }
1972
1973 /* talk to winbindd */
1974 static int winbind_chauthtok_request(struct pwb_context *ctx,
1975                                      const char *user,
1976                                      const char *oldpass,
1977                                      const char *newpass,
1978                                      time_t pwd_last_set)
1979 {
1980         wbcErr wbc_status;
1981         struct wbcChangePasswordParams params;
1982         struct wbcAuthErrorInfo *error = NULL;
1983         struct wbcUserPasswordPolicyInfo *policy = NULL;
1984         enum wbcPasswordChangeRejectReason reject_reason = -1;
1985         uint32_t flags = 0;
1986
1987         int i;
1988         const char *codes[] = {
1989                 "NT_STATUS_BACKUP_CONTROLLER",
1990                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1991                 "NT_STATUS_NO_LOGON_SERVERS",
1992                 "NT_STATUS_ACCESS_DENIED",
1993                 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1994                 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1995                 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1996         };
1997         int ret = PAM_AUTH_ERR;
1998
1999         ZERO_STRUCT(params);
2000
2001         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2002                 flags |= WBFLAG_PAM_KRB5 |
2003                          WBFLAG_PAM_CONTACT_TRUSTDOM;
2004         }
2005
2006         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
2007                 flags |= WBFLAG_PAM_CACHED_LOGIN;
2008         }
2009
2010         params.account_name             = user;
2011         params.level                    = WBC_CHANGE_PASSWORD_LEVEL_PLAIN;
2012         params.old_password.plaintext   = oldpass;
2013         params.new_password.plaintext   = newpass;
2014         params.flags                    = flags;
2015
2016         wbc_status = wbcCtxChangeUserPasswordEx(ctx->wbc_ctx,
2017                                                 &params,
2018                                                 &error,
2019                                                 &reject_reason,
2020                                                 &policy);
2021         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2022                                           user, "wbcChangeUserPasswordEx");
2023
2024         if (WBC_ERROR_IS_OK(wbc_status)) {
2025                 _pam_log(ctx, LOG_NOTICE,
2026                          "user '%s' password changed", user);
2027                 return PAM_SUCCESS;
2028         }
2029
2030         if (!error) {
2031                 wbcFreeMemory(policy);
2032                 return ret;
2033         }
2034
2035         for (i=0; i<ARRAY_SIZE(codes); i++) {
2036                 int _ret = ret;
2037                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
2038                         ret = _ret;
2039                         goto done;
2040                 }
2041         }
2042
2043         if (!strcasecmp(error->nt_string,
2044                         "NT_STATUS_PASSWORD_RESTRICTION")) {
2045
2046                 char *pwd_restriction_string = NULL;
2047                 SMB_TIME_T min_pwd_age = 0;
2048
2049                 if (policy) {
2050                         min_pwd_age     = policy->min_passwordage;
2051                 }
2052
2053                 /* FIXME: avoid to send multiple PAM messages after another */
2054                 switch ((int)reject_reason) {
2055                         case -1:
2056                                 break;
2057                         case WBC_PWD_CHANGE_NO_ERROR:
2058                                 if ((min_pwd_age > 0) &&
2059                                     (pwd_last_set + min_pwd_age > time(NULL))) {
2060                                         time_t next_change = pwd_last_set + min_pwd_age;
2061 #if defined(__clang__)
2062 #pragma clang diagnostic push
2063 #pragma clang diagnostic ignored "-Wformat-nonliteral"
2064 #endif
2065                                         _make_remark_format(ctx, PAM_ERROR_MSG,
2066                                                 _get_ntstatus_error_string("NT_STATUS_PWD_TOO_RECENT"),
2067                                                 ctime(&next_change));
2068 #if defined(__clang__)
2069 #pragma clang diagnostic pop
2070 #endif
2071                                         goto done;
2072                                 }
2073                                 break;
2074                         case WBC_PWD_CHANGE_PASSWORD_TOO_SHORT:
2075                                 PAM_WB_REMARK_DIRECT(ctx,
2076                                         "NT_STATUS_PWD_TOO_SHORT");
2077                                 break;
2078                         case WBC_PWD_CHANGE_PWD_IN_HISTORY:
2079                                 PAM_WB_REMARK_DIRECT(ctx,
2080                                         "NT_STATUS_PWD_HISTORY_CONFLICT");
2081                                 break;
2082                         case WBC_PWD_CHANGE_NOT_COMPLEX:
2083                                 _make_remark(ctx, PAM_ERROR_MSG,
2084                                              _("Password does not meet "
2085                                                "complexity requirements"));
2086                                 break;
2087                         default:
2088                                 _pam_log_debug(ctx, LOG_DEBUG,
2089                                                "unknown password change "
2090                                                "reject reason: %d",
2091                                                reject_reason);
2092                                 break;
2093                 }
2094
2095                 pwd_restriction_string =
2096                         _pam_compose_pwd_restriction_string(ctx, policy);
2097                 if (pwd_restriction_string) {
2098                         _make_remark(ctx, PAM_ERROR_MSG,
2099                                      pwd_restriction_string);
2100                         TALLOC_FREE(pwd_restriction_string);
2101                 }
2102         }
2103  done:
2104         wbcFreeMemory(error);
2105         wbcFreeMemory(policy);
2106
2107         return ret;
2108 }
2109
2110 /*
2111  * Checks if a user has an account
2112  *
2113  * return values:
2114  *       1  = User not found
2115  *       0  = OK
2116  *      -1  = System error
2117  */
2118 static int valid_user(struct pwb_context *ctx,
2119                       const char *user)
2120 {
2121         /* check not only if the user is available over NSS calls, also make
2122          * sure it's really a winbind user, this is important when stacking PAM
2123          * modules in the 'account' or 'password' facility. */
2124
2125         wbcErr wbc_status;
2126         struct passwd *pwd = NULL;
2127         struct passwd *wb_pwd = NULL;
2128
2129         pwd = getpwnam(user);
2130         if (pwd == NULL) {
2131                 return 1;
2132         }
2133
2134         wbc_status = wbcCtxGetpwnam(ctx->wbc_ctx, user, &wb_pwd);
2135         wbcFreeMemory(wb_pwd);
2136         if (!WBC_ERROR_IS_OK(wbc_status)) {
2137                 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
2138                         wbcErrorString(wbc_status));
2139         }
2140
2141         switch (wbc_status) {
2142                 case WBC_ERR_UNKNOWN_USER:
2143                 /* match other insane libwbclient return codes */
2144                 case WBC_ERR_WINBIND_NOT_AVAILABLE:
2145                 case WBC_ERR_DOMAIN_NOT_FOUND:
2146                         return 1;
2147                 case WBC_ERR_SUCCESS:
2148                         return 0;
2149                 default:
2150                         break;
2151         }
2152         return -1;
2153 }
2154
2155 static char *_pam_delete(register char *xx)
2156 {
2157         _pam_overwrite(xx);
2158         _pam_drop(xx);
2159         return NULL;
2160 }
2161
2162 /*
2163  * obtain a password from the user
2164  */
2165
2166 static int _winbind_read_password(struct pwb_context *ctx,
2167                                   unsigned int ctrl,
2168                                   const char *comment,
2169                                   const char *prompt1,
2170                                   const char *prompt2,
2171                                   const char **pass)
2172 {
2173         int authtok_flag;
2174         int retval;
2175         const char *item;
2176         char *token;
2177
2178         _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2179
2180         /*
2181          * make sure nothing inappropriate gets returned
2182          */
2183
2184         *pass = token = NULL;
2185
2186         /*
2187          * which authentication token are we getting?
2188          */
2189
2190         if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2191                 authtok_flag = PAM_OLDAUTHTOK;
2192         } else {
2193                 authtok_flag = PAM_AUTHTOK;
2194         }
2195
2196         /*
2197          * should we obtain the password from a PAM item ?
2198          */
2199
2200         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2201             on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2202                 retval = pam_get_item(ctx->pamh,
2203                                       authtok_flag,
2204                                       (const void **) &item);
2205                 if (retval != PAM_SUCCESS) {
2206                         /* very strange. */
2207                         _pam_log(ctx, LOG_ALERT,
2208                                  "pam_get_item returned error "
2209                                  "to unix-read-password");
2210                         return retval;
2211                 } else if (item != NULL) {      /* we have a password! */
2212                         *pass = item;
2213                         item = NULL;
2214                         _pam_log(ctx, LOG_DEBUG,
2215                                  "pam_get_item returned a password");
2216                         return PAM_SUCCESS;
2217                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2218                         return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2219                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2220                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
2221                         return PAM_AUTHTOK_RECOVER_ERR;
2222                 }
2223         }
2224         /*
2225          * getting here implies we will have to get the password from the
2226          * user directly.
2227          */
2228
2229         {
2230                 struct pam_message msg[3];
2231                 const struct pam_message *pmsg[3];
2232                 struct pam_response *resp;
2233                 int i, replies;
2234
2235                 /* prepare to converse */
2236
2237                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2238                         pmsg[0] = &msg[0];
2239                         msg[0].msg_style = PAM_TEXT_INFO;
2240                         msg[0].msg = discard_const_p(char, comment);
2241                         i = 1;
2242                 } else {
2243                         i = 0;
2244                 }
2245
2246                 pmsg[i] = &msg[i];
2247                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2248                 msg[i++].msg = discard_const_p(char, prompt1);
2249                 replies = 1;
2250
2251                 if (prompt2 != NULL) {
2252                         pmsg[i] = &msg[i];
2253                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2254                         msg[i++].msg = discard_const_p(char, prompt2);
2255                         ++replies;
2256                 }
2257                 /* so call the conversation expecting i responses */
2258                 resp = NULL;
2259                 retval = converse(ctx->pamh, i, pmsg, &resp);
2260                 if (resp == NULL) {
2261                         if (retval == PAM_SUCCESS) {
2262                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2263                         }
2264                         goto done;
2265                 }
2266                 if (retval != PAM_SUCCESS) {
2267                         _pam_drop_reply(resp, i);
2268                         goto done;
2269                 }
2270
2271                 /* interpret the response */
2272
2273                 token = x_strdup(resp[i - replies].resp);
2274                 if (!token) {
2275                         _pam_log(ctx, LOG_NOTICE,
2276                                  "could not recover "
2277                                  "authentication token");
2278                         retval = PAM_AUTHTOK_RECOVER_ERR;
2279                         goto done;
2280                 }
2281
2282                 if (replies == 2) {
2283                         /* verify that password entered correctly */
2284                         if (!resp[i - 1].resp ||
2285                             strcmp(token, resp[i - 1].resp)) {
2286                                 _pam_delete(token);     /* mistyped */
2287                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2288                                 _make_remark(ctx, PAM_ERROR_MSG,
2289                                              MISTYPED_PASS);
2290                         }
2291                 }
2292
2293                 /*
2294                  * tidy up the conversation (resp_retcode) is ignored
2295                  * -- what is it for anyway? AGM
2296                  */
2297                 _pam_drop_reply(resp, i);
2298         }
2299
2300  done:
2301         if (retval != PAM_SUCCESS) {
2302                 _pam_log_debug(ctx, LOG_DEBUG,
2303                                "unable to obtain a password");
2304                 return retval;
2305         }
2306         /* 'token' is the entered password */
2307
2308         /* we store this password as an item */
2309
2310         retval = pam_set_item(ctx->pamh, authtok_flag, token);
2311         _pam_delete(token);     /* clean it up */
2312         if (retval != PAM_SUCCESS ||
2313             (retval = pam_get_item(ctx->pamh, authtok_flag, (const void **) &item)) != PAM_SUCCESS) {
2314
2315                 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2316                 return retval;
2317
2318         }
2319
2320         *pass = item;
2321         item = NULL;            /* break link to password */
2322
2323         return PAM_SUCCESS;
2324 }
2325
2326 static const char *get_conf_item_string(struct pwb_context *ctx,
2327                                         const char *item,
2328                                         int config_flag)
2329 {
2330         int i = 0;
2331         const char *parm_opt = NULL;
2332
2333         if (!(ctx->ctrl & config_flag)) {
2334                 goto out;
2335         }
2336
2337         /* let the pam opt take precedence over the pam_winbind.conf option */
2338         for (i=0; i<ctx->argc; i++) {
2339
2340                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2341                         char *p;
2342
2343                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2344                                 _pam_log(ctx, LOG_INFO,
2345                                          "no \"=\" delimiter for \"%s\" found\n",
2346                                          item);
2347                                 goto out;
2348                         }
2349                         _pam_log_debug(ctx, LOG_INFO,
2350                                        "PAM config: %s '%s'\n", item, p+1);
2351                         return p + 1;
2352                 }
2353         }
2354
2355         if (ctx->dict) {
2356                 char *key = NULL;
2357
2358                 key = talloc_asprintf(ctx, "global:%s", item);
2359                 if (!key) {
2360                         goto out;
2361                 }
2362
2363                 parm_opt = tiniparser_getstring_nonempty(ctx->dict, key, NULL);
2364                 TALLOC_FREE(key);
2365
2366                 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2367                                item, parm_opt);
2368         }
2369 out:
2370         return parm_opt;
2371 }
2372
2373 static int get_config_item_int(struct pwb_context *ctx,
2374                                const char *item,
2375                                int config_flag)
2376 {
2377         int i, parm_opt = -1;
2378
2379         if (!(ctx->ctrl & config_flag)) {
2380                 goto out;
2381         }
2382
2383         /* let the pam opt take precedence over the pam_winbind.conf option */
2384         for (i = 0; i < ctx->argc; i++) {
2385
2386                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2387                         char *p;
2388
2389                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2390                                 _pam_log(ctx, LOG_INFO,
2391                                          "no \"=\" delimiter for \"%s\" found\n",
2392                                          item);
2393                                 goto out;
2394                         }
2395                         parm_opt = atoi(p + 1);
2396                         _pam_log_debug(ctx, LOG_INFO,
2397                                        "PAM config: %s '%d'\n",
2398                                        item, parm_opt);
2399                         return parm_opt;
2400                 }
2401         }
2402
2403         if (ctx->dict) {
2404                 char *key = NULL;
2405
2406                 key = talloc_asprintf(ctx, "global:%s", item);
2407                 if (!key) {
2408                         goto out;
2409                 }
2410
2411                 parm_opt = tiniparser_getint(ctx->dict, key, -1);
2412                 TALLOC_FREE(key);
2413
2414                 _pam_log_debug(ctx, LOG_INFO,
2415                                "CONFIG file: %s '%d'\n",
2416                                item, parm_opt);
2417         }
2418 out:
2419         return parm_opt;
2420 }
2421
2422 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2423 {
2424         return get_conf_item_string(ctx, "krb5_ccache_type",
2425                                     WINBIND_KRB5_CCACHE_TYPE);
2426 }
2427
2428 static const char *get_member_from_config(struct pwb_context *ctx)
2429 {
2430         const char *ret = NULL;
2431         ret = get_conf_item_string(ctx, "require_membership_of",
2432                                    WINBIND_REQUIRED_MEMBERSHIP);
2433         if (ret != NULL) {
2434                 return ret;
2435         }
2436         return get_conf_item_string(ctx, "require-membership-of",
2437                                     WINBIND_REQUIRED_MEMBERSHIP);
2438 }
2439
2440 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2441 {
2442         int ret;
2443         ret = get_config_item_int(ctx, "warn_pwd_expire",
2444                                   WINBIND_WARN_PWD_EXPIRE);
2445         /* no or broken setting */
2446         if (ret < 0) {
2447                 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2448         }
2449         return ret;
2450 }
2451
2452 /**
2453  * Retrieve the winbind separator.
2454  *
2455  * @param ctx PAM winbind context.
2456  *
2457  * @return string separator character. NULL on failure.
2458  */
2459
2460 static char winbind_get_separator(struct pwb_context *ctx)
2461 {
2462         wbcErr wbc_status;
2463         static struct wbcInterfaceDetails *details = NULL;
2464
2465         wbc_status = wbcCtxInterfaceDetails(ctx->wbc_ctx, &details);
2466         if (!WBC_ERROR_IS_OK(wbc_status)) {
2467                 _pam_log(ctx, LOG_ERR,
2468                          "Could not retrieve winbind interface details: %s",
2469                          wbcErrorString(wbc_status));
2470                 return '\0';
2471         }
2472
2473         if (!details) {
2474                 return '\0';
2475         }
2476
2477         return details->winbind_separator;
2478 }
2479
2480
2481 /**
2482  * Convert a upn to a name.
2483  *
2484  * @param ctx PAM winbind context.
2485  * @param upn  User UPN to be translated.
2486  *
2487  * @return converted name. NULL pointer on failure. Caller needs to free.
2488  */
2489
2490 static char* winbind_upn_to_username(struct pwb_context *ctx,
2491                                      const char *upn)
2492 {
2493         char sep;
2494         wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2495         struct wbcDomainSid sid;
2496         enum wbcSidType type;
2497         char *domain = NULL;
2498         char *name;
2499         char *p;
2500         char *result;
2501
2502         /* This cannot work when the winbind separator = @ */
2503
2504         sep = winbind_get_separator(ctx);
2505         if (!sep || sep == '@') {
2506                 return NULL;
2507         }
2508
2509         name = talloc_strdup(ctx, upn);
2510         if (!name) {
2511                 return NULL;
2512         }
2513
2514         p = strchr(name, '@');
2515         if (p == NULL) {
2516                 TALLOC_FREE(name);
2517                 return NULL;
2518         }
2519         *p = '\0';
2520         domain = p + 1;
2521
2522         /* Convert the UPN to a SID */
2523
2524         wbc_status = wbcCtxLookupName(ctx->wbc_ctx, domain, name, &sid, &type);
2525         if (!WBC_ERROR_IS_OK(wbc_status)) {
2526                 return NULL;
2527         }
2528
2529         /* Convert the the SID back to the sAMAccountName */
2530
2531         wbc_status = wbcCtxLookupSid(ctx->wbc_ctx, &sid, &domain, &name, &type);
2532         if (!WBC_ERROR_IS_OK(wbc_status)) {
2533                 return NULL;
2534         }
2535
2536         result = talloc_asprintf(ctx, "%s%c%s", domain, sep, name);
2537         wbcFreeMemory(domain);
2538         wbcFreeMemory(name);
2539         return result;
2540 }
2541
2542 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2543                             int argc, enum pam_winbind_request_type type,
2544                             const char **argv)
2545 {
2546         int retval = PAM_SUCCESS;
2547         struct pwb_context *ctx = NULL;
2548         struct wbcLogoffUserParams logoff;
2549         struct wbcAuthErrorInfo *error = NULL;
2550         const char *user;
2551         wbcErr wbc_status = WBC_ERR_SUCCESS;
2552
2553         ZERO_STRUCT(logoff);
2554
2555         retval = _pam_winbind_init_context(pamh, flags, argc, argv, type, &ctx);
2556         if (retval != PAM_SUCCESS) {
2557                 return retval;
2558         }
2559
2560         _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2561
2562         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2563
2564                 /* destroy the ccache here */
2565
2566                 uint32_t wbc_flags = 0;
2567                 const char *ccname = NULL;
2568                 struct passwd *pwd = NULL;
2569
2570                 retval = pam_get_user(pamh, &user, _("Username: "));
2571                 if (retval != PAM_SUCCESS) {
2572                         _pam_log(ctx, LOG_ERR,
2573                                  "could not identify user");
2574                         goto out;
2575                 }
2576
2577                 if (user == NULL) {
2578                         _pam_log(ctx, LOG_ERR,
2579                                  "username was NULL!");
2580                         retval = PAM_USER_UNKNOWN;
2581                         goto out;
2582                 }
2583
2584                 _pam_log_debug(ctx, LOG_DEBUG,
2585                                "username [%s] obtained", user);
2586
2587                 ccname = pam_getenv(pamh, "KRB5CCNAME");
2588                 if (ccname == NULL) {
2589                         _pam_log_debug(ctx, LOG_DEBUG,
2590                                        "user has no KRB5CCNAME environment");
2591                 }
2592
2593                 pwd = getpwnam(user);
2594                 if (pwd == NULL) {
2595                         retval = PAM_USER_UNKNOWN;
2596                         goto out;
2597                 }
2598
2599                 wbc_flags = WBFLAG_PAM_KRB5 |
2600                         WBFLAG_PAM_CONTACT_TRUSTDOM;
2601
2602                 logoff.username         = user;
2603
2604                 if (ccname) {
2605                         wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2606                                                      &logoff.blobs,
2607                                                      "ccfilename",
2608                                                      0,
2609                                                      discard_const_p(uint8_t, ccname),
2610                                                      strlen(ccname)+1);
2611                         if (!WBC_ERROR_IS_OK(wbc_status)) {
2612                                 goto out;
2613                         }
2614                 }
2615
2616                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2617                                              &logoff.blobs,
2618                                              "flags",
2619                                              0,
2620                                              (uint8_t *)&wbc_flags,
2621                                              sizeof(wbc_flags));
2622                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2623                         goto out;
2624                 }
2625
2626                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2627                                              &logoff.blobs,
2628                                              "user_uid",
2629                                              0,
2630                                              (uint8_t *)&pwd->pw_uid,
2631                                              sizeof(pwd->pw_uid));
2632                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2633                         goto out;
2634                 }
2635
2636                 wbc_status = wbcCtxLogoffUserEx(ctx->wbc_ctx, &logoff, &error);
2637                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2638                                                      user, "wbcLogoffUser");
2639                 wbcFreeMemory(logoff.blobs);
2640                 logoff.blobs = NULL;
2641
2642                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2643                         _pam_log(ctx, LOG_INFO,
2644                                  "failed to logoff user %s: %s\n",
2645                                          user, wbcErrorString(wbc_status));
2646                 }
2647         }
2648
2649 out:
2650         if (logoff.blobs) {
2651                 wbcFreeMemory(logoff.blobs);
2652         }
2653
2654         if (!WBC_ERROR_IS_OK(wbc_status)) {
2655                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2656                      user, "wbcLogoffUser");
2657         }
2658         wbcFreeMemory(error);
2659
2660         /*
2661          * Delete the krb5 ccname variable from the PAM environment
2662          * if it was set by winbind.
2663          */
2664         if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2665                 pam_putenv(pamh, "KRB5CCNAME");
2666         }
2667
2668         _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2669
2670         TALLOC_FREE(ctx);
2671
2672         return retval;
2673 }
2674
2675 #ifdef SECURITY_OPENPAM_H_INCLUDED
2676 /*
2677  * Logic below is copied from openpam_check_error_code() in
2678  *./contrib/openpam/lib/libpam/openpam_dispatch.c on FreeBSD.
2679  */
2680 static int openpam_convert_error_code(struct pwb_context *ctx,
2681                                       enum pam_winbind_request_type req,
2682                                       int r)
2683 {
2684         if (r == PAM_SUCCESS ||
2685             r == PAM_SYSTEM_ERR ||
2686             r == PAM_SERVICE_ERR ||
2687             r == PAM_BUF_ERR ||
2688             r == PAM_CONV_ERR ||
2689             r == PAM_PERM_DENIED ||
2690             r == PAM_ABORT) {
2691                 return r;
2692         }
2693
2694         /* specific winbind request types */
2695         switch (req) {
2696         case PAM_WINBIND_AUTHENTICATE:
2697                 if (r == PAM_AUTH_ERR ||
2698                     r == PAM_CRED_INSUFFICIENT ||
2699                     r == PAM_AUTHINFO_UNAVAIL ||
2700                     r == PAM_USER_UNKNOWN ||
2701                     r == PAM_MAXTRIES) {
2702                         return r;
2703                 }
2704                 break;
2705         case PAM_WINBIND_SETCRED:
2706                 if (r == PAM_CRED_UNAVAIL ||
2707                     r == PAM_CRED_EXPIRED ||
2708                     r == PAM_USER_UNKNOWN ||
2709                     r == PAM_CRED_ERR) {
2710                         return r;
2711                 }
2712                 break;
2713         case PAM_WINBIND_ACCT_MGMT:
2714                 if (r == PAM_USER_UNKNOWN ||
2715                     r == PAM_AUTH_ERR ||
2716                     r == PAM_NEW_AUTHTOK_REQD ||
2717                     r == PAM_ACCT_EXPIRED) {
2718                         return r;
2719                 }
2720                 break;
2721         case PAM_WINBIND_OPEN_SESSION:
2722         case PAM_WINBIND_CLOSE_SESSION:
2723                 if (r == PAM_SESSION_ERR) {
2724                         return r;
2725                 }
2726                 break;
2727         case PAM_WINBIND_CHAUTHTOK:
2728                 if (r == PAM_PERM_DENIED ||
2729                     r == PAM_AUTHTOK_ERR ||
2730                     r == PAM_AUTHTOK_RECOVERY_ERR ||
2731                     r == PAM_AUTHTOK_LOCK_BUSY ||
2732                     r == PAM_AUTHTOK_DISABLE_AGING ||
2733                     r == PAM_TRY_AGAIN) {
2734                         return r;
2735                 }
2736                 break;
2737         default:
2738                 break;
2739         }
2740         _pam_log(ctx, LOG_INFO,
2741                  "Converting PAM error [%d] to PAM_SERVICE_ERR.\n", r);
2742         return PAM_SERVICE_ERR;
2743 };
2744 #define pam_error_code(a, b, c) openpam_convert_error_code(a, b, c)
2745 #else
2746 #define pam_error_code(a, b, c) (c)
2747 #endif
2748
2749 _PUBLIC_ PAM_EXTERN
2750 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2751                         int argc, const char **argv)
2752 {
2753         const char *username;
2754         const char *password;
2755         const char *member = NULL;
2756         const char *cctype = NULL;
2757         int warn_pwd_expire;
2758         int retval = PAM_AUTH_ERR;
2759         char *username_ret = NULL;
2760         char *new_authtok_required = NULL;
2761         char *real_username = NULL;
2762         struct pwb_context *ctx = NULL;
2763
2764         retval = _pam_winbind_init_context(pamh, flags, argc, argv,
2765                                            PAM_WINBIND_AUTHENTICATE, &ctx);
2766         if (retval != PAM_SUCCESS) {
2767                 return retval;
2768         }
2769
2770         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2771
2772         /* Get the username */
2773         retval = pam_get_user(pamh, &username, NULL);
2774         if ((retval != PAM_SUCCESS) || (!username)) {
2775                 _pam_log_debug(ctx, LOG_DEBUG,
2776                                "can not get the username");
2777                 retval = PAM_SERVICE_ERR;
2778                 goto out;
2779         }
2780
2781
2782 #if defined(AIX)
2783         /* Decode the user name since AIX does not support logn user
2784            names by default.  The name is encoded as _#uid.  */
2785
2786         if (username[0] == '_') {
2787                 uid_t id = atoi(&username[1]);
2788                 struct passwd *pw = NULL;
2789
2790                 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2791                         real_username = strdup(pw->pw_name);
2792                 }
2793         }
2794 #endif
2795
2796         if (!real_username) {
2797                 /* Just making a copy of the username we got from PAM */
2798                 if ((real_username = strdup(username)) == NULL) {
2799                         _pam_log_debug(ctx, LOG_DEBUG,
2800                                        "memory allocation failure when copying "
2801                                        "username");
2802                         retval = PAM_SERVICE_ERR;
2803                         goto out;
2804                 }
2805         }
2806
2807         /* Maybe this was a UPN */
2808
2809         if (strchr(real_username, '@') != NULL) {
2810                 char *samaccountname = NULL;
2811
2812                 samaccountname = winbind_upn_to_username(ctx,
2813                                                          real_username);
2814                 if (samaccountname) {
2815                         free(real_username);
2816                         real_username = strdup(samaccountname);
2817                 }
2818         }
2819
2820         retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2821                                         _("Password: "), NULL,
2822                                         &password);
2823
2824         if (retval != PAM_SUCCESS) {
2825                 _pam_log(ctx, LOG_ERR,
2826                          "Could not retrieve user's password");
2827                 retval = PAM_AUTHTOK_ERR;
2828                 goto out;
2829         }
2830
2831         /* Let's not give too much away in the log file */
2832
2833 #ifdef DEBUG_PASSWORD
2834         _pam_log_debug(ctx, LOG_INFO,
2835                        "Verify user '%s' with password '%s'",
2836                        real_username, password);
2837 #else
2838         _pam_log_debug(ctx, LOG_INFO,
2839                        "Verify user '%s'", real_username);
2840 #endif
2841
2842         member = get_member_from_config(ctx);
2843         cctype = get_krb5_cc_type_from_config(ctx);
2844         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2845
2846         /* Now use the username to look up password */
2847         retval = winbind_auth_request(ctx, real_username, password,
2848                                       member, cctype, warn_pwd_expire,
2849                                       NULL, NULL, NULL, &username_ret);
2850
2851         if (retval == PAM_NEW_AUTHTOK_REQD ||
2852             retval == PAM_AUTHTOK_EXPIRED) {
2853
2854                 char *new_authtok_required_during_auth = NULL;
2855
2856                 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2857                 if (!new_authtok_required) {
2858                         retval = PAM_BUF_ERR;
2859                         goto out;
2860                 }
2861
2862                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2863                              new_authtok_required,
2864                              _pam_winbind_cleanup_func);
2865
2866                 retval = PAM_SUCCESS;
2867
2868                 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2869                 if (!new_authtok_required_during_auth) {
2870                         retval = PAM_BUF_ERR;
2871                         goto out;
2872                 }
2873
2874                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2875                              new_authtok_required_during_auth,
2876                              _pam_winbind_cleanup_func);
2877
2878                 goto out;
2879         }
2880
2881 out:
2882         if (username_ret) {
2883                 pam_set_item (pamh, PAM_USER, username_ret);
2884                 _pam_log_debug(ctx, LOG_INFO,
2885                                "Returned user was '%s'", username_ret);
2886                 free(username_ret);
2887         }
2888
2889         if (real_username) {
2890                 free(real_username);
2891         }
2892
2893         if (!new_authtok_required) {
2894                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2895         }
2896
2897         if (retval != PAM_SUCCESS) {
2898                 _pam_free_data_info3(pamh);
2899         }
2900
2901         _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2902
2903         TALLOC_FREE(ctx);
2904
2905         return retval;
2906 }
2907
2908 _PUBLIC_ PAM_EXTERN
2909 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2910                    int argc, const char **argv)
2911 {
2912         int ret = PAM_SYSTEM_ERR;
2913         struct pwb_context *ctx = NULL;
2914
2915         ret = _pam_winbind_init_context(pamh, flags, argc, argv,
2916                                         PAM_WINBIND_SETCRED, &ctx);
2917         if (ret != PAM_SUCCESS) {
2918                 return ret;
2919         }
2920
2921         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2922
2923         switch (flags & ~PAM_SILENT) {
2924
2925                 case PAM_DELETE_CRED:
2926                         ret = _pam_delete_cred(pamh, flags, argc,
2927                                                PAM_WINBIND_SETCRED, argv);
2928                         break;
2929                 case PAM_REFRESH_CRED:
2930                         _pam_log_debug(ctx, LOG_WARNING,
2931                                        "PAM_REFRESH_CRED not implemented");
2932                         ret = PAM_SUCCESS;
2933                         break;
2934                 case PAM_REINITIALIZE_CRED:
2935                         _pam_log_debug(ctx, LOG_WARNING,
2936                                        "PAM_REINITIALIZE_CRED not implemented");
2937                         ret = PAM_SUCCESS;
2938                         break;
2939                 case PAM_ESTABLISH_CRED:
2940                         _pam_log_debug(ctx, LOG_WARNING,
2941                                        "PAM_ESTABLISH_CRED not implemented");
2942                         ret = PAM_SUCCESS;
2943                         break;
2944                 default:
2945                         ret = PAM_SYSTEM_ERR;
2946                         break;
2947         }
2948
2949         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2950
2951         TALLOC_FREE(ctx);
2952
2953         return pam_error_code(ctx, PAM_WINBIND_SETCRED, ret);
2954 }
2955
2956 /*
2957  * Account management. We want to verify that the account exists
2958  * before returning PAM_SUCCESS
2959  */
2960 _PUBLIC_ PAM_EXTERN
2961 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2962                    int argc, const char **argv)
2963 {
2964         const char *username;
2965         int ret = PAM_USER_UNKNOWN;
2966         const char *tmp = NULL;
2967         struct pwb_context *ctx = NULL;
2968
2969         ret = _pam_winbind_init_context(pamh, flags, argc, argv,
2970                                         PAM_WINBIND_ACCT_MGMT, &ctx);
2971         if (ret != PAM_SUCCESS) {
2972                 return ret;
2973         }
2974
2975         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2976
2977
2978         /* Get the username */
2979         ret = pam_get_user(pamh, &username, NULL);
2980         if ((ret != PAM_SUCCESS) || (!username)) {
2981                 _pam_log_debug(ctx, LOG_DEBUG,
2982                                "can not get the username");
2983                 ret = PAM_SERVICE_ERR;
2984                 goto out;
2985         }
2986
2987         /* Verify the username */
2988         ret = valid_user(ctx, username);
2989         switch (ret) {
2990         case -1:
2991                 /* some sort of system error. The log was already printed */
2992                 ret = PAM_SERVICE_ERR;
2993                 goto out;
2994         case 1:
2995                 /* the user does not exist */
2996                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2997                                username);
2998                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2999                         ret = PAM_IGNORE;
3000                         goto out;
3001                 }
3002                 ret = PAM_USER_UNKNOWN;
3003                 goto out;
3004         case 0:
3005                 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
3006                              (const void **)&tmp);
3007                 if (tmp != NULL) {
3008                         ret = atoi(tmp);
3009                         switch (ret) {
3010                         case PAM_AUTHTOK_EXPIRED:
3011                                 /* Since new token is required in this case */
3012                                 FALL_THROUGH;
3013                         case PAM_NEW_AUTHTOK_REQD:
3014                                 _pam_log(ctx, LOG_WARNING,
3015                                          "pam_sm_acct_mgmt success but %s is set",
3016                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
3017                                 _pam_log(ctx, LOG_NOTICE,
3018                                          "user '%s' needs new password",
3019                                          username);
3020                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
3021                                 ret = PAM_NEW_AUTHTOK_REQD;
3022                                 goto out;
3023                         default:
3024                                 _pam_log(ctx, LOG_WARNING,
3025                                          "pam_sm_acct_mgmt success");
3026                                 _pam_log(ctx, LOG_NOTICE,
3027                                          "user '%s' granted access", username);
3028                                 ret = PAM_SUCCESS;
3029                                 goto out;
3030                         }
3031                 }
3032
3033                 /* Otherwise, the authentication looked good */
3034                 _pam_log(ctx, LOG_NOTICE,
3035                          "user '%s' granted access", username);
3036                 ret = PAM_SUCCESS;
3037                 goto out;
3038         default:
3039                 /* we don't know anything about this return value */
3040                 _pam_log(ctx, LOG_ERR,
3041                          "internal module error (ret = %d, user = '%s')",
3042                          ret, username);
3043                 ret = PAM_SERVICE_ERR;
3044                 goto out;
3045         }
3046
3047         /* should not be reached */
3048         ret = PAM_IGNORE;
3049
3050  out:
3051
3052         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
3053
3054         TALLOC_FREE(ctx);
3055
3056         return pam_error_code(ctx, PAM_WINBIND_ACCT_MGMT, ret);
3057 }
3058
3059 _PUBLIC_ PAM_EXTERN
3060 int pam_sm_open_session(pam_handle_t *pamh, int flags,
3061                         int argc, const char **argv)
3062 {
3063         int ret = PAM_SUCCESS;
3064         struct pwb_context *ctx = NULL;
3065
3066         ret = _pam_winbind_init_context(pamh, flags, argc, argv,
3067                                         PAM_WINBIND_OPEN_SESSION, &ctx);
3068         if (ret != PAM_SUCCESS) {
3069                 return ret;
3070         }
3071
3072         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
3073
3074         if (ctx->ctrl & WINBIND_MKHOMEDIR) {
3075                 /* check and create homedir */
3076                 ret = _pam_mkhomedir(ctx);
3077         }
3078
3079         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
3080
3081         TALLOC_FREE(ctx);
3082
3083         return pam_error_code(ctx, PAM_WINBIND_OPEN_SESSION, ret);
3084 }
3085
3086 _PUBLIC_ PAM_EXTERN
3087 int pam_sm_close_session(pam_handle_t *pamh, int flags,
3088                          int argc, const char **argv)
3089 {
3090         int ret = PAM_SUCCESS;
3091         struct pwb_context *ctx = NULL;
3092
3093         ret = _pam_winbind_init_context(pamh, flags, argc, argv,
3094                                         PAM_WINBIND_CLOSE_SESSION, &ctx);
3095         if (ret != PAM_SUCCESS) {
3096                 return ret;
3097         }
3098
3099         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
3100
3101         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
3102
3103         TALLOC_FREE(ctx);
3104
3105         return pam_error_code(ctx, PAM_WINBIND_CLOSE_SESSION, ret);
3106 }
3107
3108 /**
3109  * evaluate whether we need to re-authenticate with kerberos after a
3110  * password change
3111  *
3112  * @param ctx PAM winbind context.
3113  * @param user The username
3114  *
3115  * @return boolean Returns true if required, false if not.
3116  */
3117
3118 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
3119                                                    const char *user)
3120 {
3121
3122         /* Make sure that we only do this if a) the chauthtok got initiated
3123          * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
3124          * later password change via the "passwd" command if done by the user
3125          * itself
3126          * NB. If we login from gdm or xdm and the password expires,
3127          * we change the password, but there is no memory cache.
3128          * Thus, even for passthrough login, we should do the
3129          * authentication again to update memory cache.
3130          * --- BoYang
3131          * */
3132
3133         const char *new_authtok_reqd_during_auth = NULL;
3134         struct passwd *pwd = NULL;
3135
3136         pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
3137                       (const void **) &new_authtok_reqd_during_auth);
3138         pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
3139                      NULL, NULL);
3140
3141         if (new_authtok_reqd_during_auth) {
3142                 return true;
3143         }
3144
3145         pwd = getpwnam(user);
3146         if (!pwd) {
3147                 return false;
3148         }
3149
3150         if (getuid() == pwd->pw_uid) {
3151                 return true;
3152         }
3153
3154         return false;
3155 }
3156
3157
3158 _PUBLIC_ PAM_EXTERN
3159 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
3160                      int argc, const char **argv)
3161 {
3162         unsigned int lctrl;
3163         int ret;
3164         bool cached_login = false;
3165
3166         /* <DO NOT free() THESE> */
3167         const char *user;
3168         const char *pass_old;
3169         const char *pass_new;
3170         /* </DO NOT free() THESE> */
3171
3172         char *Announce;
3173
3174         int retry = 0;
3175         char *username_ret = NULL;
3176         struct wbcAuthErrorInfo *error = NULL;
3177         struct pwb_context *ctx = NULL;
3178
3179         ret = _pam_winbind_init_context(pamh, flags, argc, argv,
3180                                         PAM_WINBIND_CHAUTHTOK, &ctx);
3181         if (ret != PAM_SUCCESS) {
3182                 return ret;
3183         }
3184
3185         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
3186
3187         cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
3188
3189         /* clearing offline bit for auth */
3190         ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
3191
3192         /*
3193          * First get the name of a user
3194          */
3195         ret = pam_get_user(pamh, &user, _("Username: "));
3196         if (ret != PAM_SUCCESS) {
3197                 _pam_log(ctx, LOG_ERR,
3198                          "password - could not identify user");
3199                 goto out;
3200         }
3201
3202         if (user == NULL) {
3203                 _pam_log(ctx, LOG_ERR, "username was NULL!");
3204                 ret = PAM_USER_UNKNOWN;
3205                 goto out;
3206         }
3207
3208         _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
3209
3210         /* check if this is really a user in winbindd, not only in NSS */
3211         ret = valid_user(ctx, user);
3212         switch (ret) {
3213                 case 1:
3214                         ret = PAM_USER_UNKNOWN;
3215                         goto out;
3216                 case -1:
3217                         ret = PAM_SYSTEM_ERR;
3218                         goto out;
3219                 default:
3220                         break;
3221         }
3222
3223         /*
3224          * obtain and verify the current password (OLDAUTHTOK) for
3225          * the user.
3226          */
3227
3228         if (flags & PAM_PRELIM_CHECK) {
3229                 time_t pwdlastset_prelim = 0;
3230
3231                 /* instruct user what is happening */
3232
3233 #define greeting _("Changing password for")
3234                 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
3235                 if (!Announce) {
3236                         _pam_log(ctx, LOG_CRIT,
3237                                  "password - out of memory");
3238                         ret = PAM_BUF_ERR;
3239                         goto out;
3240                 }
3241 #undef greeting
3242
3243                 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
3244                 ret = _winbind_read_password(ctx, lctrl,
3245                                                 Announce,
3246                                                 _("(current) NT password: "),
3247                                                 NULL,
3248                                                 (const char **) &pass_old);
3249                 TALLOC_FREE(Announce);
3250                 if (ret != PAM_SUCCESS) {
3251                         _pam_log(ctx, LOG_NOTICE,
3252                                  "password - (old) token not obtained");
3253                         goto out;
3254                 }
3255
3256                 /* verify that this is the password for this user */
3257
3258                 ret = winbind_auth_request(ctx, user, pass_old,
3259                                            NULL, NULL, 0,
3260                                            &error, NULL,
3261                                            &pwdlastset_prelim, NULL);
3262
3263                 if (ret != PAM_ACCT_EXPIRED &&
3264                     ret != PAM_AUTHTOK_EXPIRED &&
3265                     ret != PAM_NEW_AUTHTOK_REQD &&
3266                     ret != PAM_SUCCESS) {
3267                         pass_old = NULL;
3268                         goto out;
3269                 }
3270
3271                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3272                              (void *)pwdlastset_prelim, NULL);
3273
3274                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3275                                    (const void *) pass_old);
3276                 pass_old = NULL;
3277                 if (ret != PAM_SUCCESS) {
3278                         _pam_log(ctx, LOG_CRIT,
3279                                  "failed to set PAM_OLDAUTHTOK");
3280                 }
3281         } else if (flags & PAM_UPDATE_AUTHTOK) {
3282
3283                 time_t pwdlastset_update = 0;
3284
3285                 /*
3286                  * obtain the proposed password
3287                  */
3288
3289                 /*
3290                  * get the old token back.
3291                  */
3292
3293                 ret = pam_get_item(pamh, PAM_OLDAUTHTOK, (const void **) &pass_old);
3294
3295                 if (ret != PAM_SUCCESS) {
3296                         _pam_log(ctx, LOG_NOTICE,
3297                                  "user not authenticated");
3298                         goto out;
3299                 }
3300
3301                 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3302
3303                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3304                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3305                 }
3306                 if (on(WINBIND_TRY_AUTHTOK_ARG, lctrl)) {
3307                         lctrl |= WINBIND_TRY_FIRST_PASS_ARG;
3308                 }
3309                 retry = 0;
3310                 ret = PAM_AUTHTOK_ERR;
3311                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3312                         /*
3313                          * use_authtok is to force the use of a previously entered
3314                          * password -- needed for pluggable password strength checking
3315                          */
3316
3317                         ret = _winbind_read_password(ctx, lctrl,
3318                                                      NULL,
3319                                                      _("Enter new NT password: "),
3320                                                      _("Retype new NT password: "),
3321                                                      (const char **)&pass_new);
3322
3323                         if (ret != PAM_SUCCESS) {
3324                                 _pam_log_debug(ctx, LOG_ALERT,
3325                                                "password - "
3326                                                "new password not obtained");
3327                                 pass_old = NULL;/* tidy up */
3328                                 goto out;
3329                         }
3330
3331                         /*
3332                          * At this point we know who the user is and what they
3333                          * propose as their new password. Verify that the new
3334                          * password is acceptable.
3335                          */
3336
3337                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
3338                                 pass_new = NULL;
3339                         }
3340                 }
3341
3342                 /*
3343                  * By reaching here we have approved the passwords and must now
3344                  * rebuild the password database file.
3345                  */
3346                 pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3347                              (const void **) &pwdlastset_update);
3348
3349                 /*
3350                  * if cached creds were enabled, make sure to set the
3351                  * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3352                  * update the cached creds storage - gd
3353                  */
3354                 if (cached_login) {
3355                         ctx->ctrl |= WINBIND_CACHED_LOGIN;
3356                 }
3357
3358                 ret = winbind_chauthtok_request(ctx, user, pass_old,
3359                                                 pass_new, pwdlastset_update);
3360                 if (ret != PAM_SUCCESS) {
3361                         pass_old = pass_new = NULL;
3362                         goto out;
3363                 }
3364
3365                 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3366
3367                         const char *member = NULL;
3368                         const char *cctype = NULL;
3369                         int warn_pwd_expire;
3370                         struct wbcLogonUserInfo *info = NULL;
3371
3372                         member = get_member_from_config(ctx);
3373                         cctype = get_krb5_cc_type_from_config(ctx);
3374                         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3375
3376                         /* Keep WINBIND_CACHED_LOGIN bit for
3377                          * authentication after changing the password.
3378                          * This will update the cached credentials in case
3379                          * that winbindd_dual_pam_chauthtok() fails
3380                          * to update them.
3381                          * --- BoYang
3382                          * */
3383
3384                         ret = winbind_auth_request(ctx, user, pass_new,
3385                                                    member, cctype, 0,
3386                                                    &error, &info,
3387                                                    NULL, &username_ret);
3388                         pass_old = pass_new = NULL;
3389
3390                         if (ret == PAM_SUCCESS) {
3391
3392                                 struct wbcAuthUserInfo *user_info = NULL;
3393
3394                                 if (info && info->info) {
3395                                         user_info = info->info;
3396                                 }
3397
3398                                 /* warn a user if the password is about to
3399                                  * expire soon */
3400                                 _pam_warn_password_expiry(ctx, user_info,
3401                                                           warn_pwd_expire,
3402                                                           NULL, NULL);
3403
3404                                 /* set some info3 info for other modules in the
3405                                  * stack */
3406                                 _pam_set_data_info3(ctx, user_info);
3407
3408                                 /* put krb5ccname into env */
3409                                 _pam_setup_krb5_env(ctx, info);
3410
3411                                 if (username_ret) {
3412                                         pam_set_item(pamh, PAM_USER,
3413                                                      username_ret);
3414                                         _pam_log_debug(ctx, LOG_INFO,
3415                                                        "Returned user was '%s'",
3416                                                        username_ret);
3417                                         free(username_ret);
3418                                 }
3419
3420                         }
3421
3422                         if (info && info->blobs) {
3423                                 wbcFreeMemory(info->blobs);
3424                         }
3425                         wbcFreeMemory(info);
3426
3427                         goto out;
3428                 }
3429         } else {
3430                 ret = PAM_SERVICE_ERR;
3431         }
3432
3433 out:
3434         {
3435                 /* Deal with offline errors. */
3436                 int i;
3437                 const char *codes[] = {
3438                         "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3439                         "NT_STATUS_NO_LOGON_SERVERS",
3440                         "NT_STATUS_ACCESS_DENIED"
3441                 };
3442
3443                 for (i=0; i<ARRAY_SIZE(codes); i++) {
3444                         int _ret;
3445                         if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3446                                 break;
3447                         }
3448                 }
3449         }
3450
3451         wbcFreeMemory(error);
3452
3453         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3454
3455         TALLOC_FREE(ctx);
3456
3457         return pam_error_code(ctx, PAM_WINBIND_CHAUTHTOK, ret);
3458 }
3459
3460 #ifdef PAM_STATIC
3461
3462 /* static module data */
3463
3464 struct pam_module _pam_winbind_modstruct = {
3465         MODULE_NAME,
3466         pam_sm_authenticate,
3467         pam_sm_setcred,
3468         pam_sm_acct_mgmt,
3469         pam_sm_open_session,
3470         pam_sm_close_session,
3471         pam_sm_chauthtok
3472 };
3473
3474 #endif
3475
3476 /*
3477  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
3478  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
3479  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3480  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2008
3481  * Copyright (c) Jan Rêkorajski 1999.
3482  * Copyright (c) Andrew G. Morgan 1996-8.
3483  * Copyright (c) Alex O. Yuriev, 1996.
3484  * Copyright (c) Cristian Gafton 1996.
3485  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3486  *
3487  * Redistribution and use in source and binary forms, with or without
3488  * modification, are permitted provided that the following conditions
3489  * are met:
3490  * 1. Redistributions of source code must retain the above copyright
3491  *    notice, and the entire permission notice in its entirety,
3492  *    including the disclaimer of warranties.
3493  * 2. Redistributions in binary form must reproduce the above copyright
3494  *    notice, this list of conditions and the following disclaimer in the
3495  *    documentation and/or other materials provided with the distribution.
3496  * 3. The name of the author may not be used to endorse or promote
3497  *    products derived from this software without specific prior
3498  *    written permission.
3499  *
3500  * ALTERNATIVELY, this product may be distributed under the terms of
3501  * the GNU Public License, in which case the provisions of the GPL are
3502  * required INSTEAD OF the above restrictions.  (This clause is
3503  * necessary due to a potential bad interaction between the GPL and
3504  * the restrictions contained in a BSD-style copyright.)
3505  *
3506  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3507  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3508  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3509  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3510  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3511  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3512  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3513  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3514  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3515  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3516  * OF THE POSSIBILITY OF SUCH DAMAGE.
3517  */