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