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