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 #define UID_WRAPPER_NOT_REPLACE
  14
  15 #include "pam_winbind.h"
  16
  17 static int wbc_error_to_pam_error(wbcErr status)
  18 {
  19         switch (status) {
  20                 case WBC_ERR_SUCCESS:
  21                         return PAM_SUCCESS;
  22                 case WBC_ERR_NOT_IMPLEMENTED:
  23                         return PAM_SERVICE_ERR;
  24                 case WBC_ERR_UNKNOWN_FAILURE:
  25                         break;
  26                 case WBC_ERR_NO_MEMORY:
  27                         return PAM_BUF_ERR;
  28                 case WBC_ERR_INVALID_SID:
  29                 case WBC_ERR_INVALID_PARAM:
  30                         break;
  31                 case WBC_ERR_WINBIND_NOT_AVAILABLE:
  32                         return PAM_AUTHINFO_UNAVAIL;
  33                 case WBC_ERR_DOMAIN_NOT_FOUND:
  34                         return PAM_AUTHINFO_UNAVAIL;
  35                 case WBC_ERR_INVALID_RESPONSE:
  36                         return PAM_BUF_ERR;
  37                 case WBC_ERR_NSS_ERROR:
  38                         return PAM_USER_UNKNOWN;
  39                 case WBC_ERR_AUTH_ERROR:
  40                         return PAM_AUTH_ERR;
  41                 case WBC_ERR_UNKNOWN_USER:
  42                         return PAM_USER_UNKNOWN;
  43                 case WBC_ERR_UNKNOWN_GROUP:
  44                         return PAM_USER_UNKNOWN;
  45                 case WBC_ERR_PWD_CHANGE_FAILED:
  46                         break;
  47         }
  48
  49         /* be paranoid */
  50         return PAM_AUTH_ERR;
  51 }
  52
  53 static const char *_pam_error_code_str(int err)
  54 {
  55         switch (err) {
  56                 case PAM_SUCCESS:
  57                         return "PAM_SUCCESS";
  58                 case PAM_OPEN_ERR:
  59                         return "PAM_OPEN_ERR";
  60                 case PAM_SYMBOL_ERR:
  61                         return "PAM_SYMBOL_ERR";
  62                 case PAM_SERVICE_ERR:
  63                         return "PAM_SERVICE_ERR";
  64                 case PAM_SYSTEM_ERR:
  65                         return "PAM_SYSTEM_ERR";
  66                 case PAM_BUF_ERR:
  67                         return "PAM_BUF_ERR";
  68                 case PAM_PERM_DENIED:
  69                         return "PAM_PERM_DENIED";
  70                 case PAM_AUTH_ERR:
  71                         return "PAM_AUTH_ERR";
  72                 case PAM_CRED_INSUFFICIENT:
  73                         return "PAM_CRED_INSUFFICIENT";
  74                 case PAM_AUTHINFO_UNAVAIL:
  75                         return "PAM_AUTHINFO_UNAVAIL";
  76                 case PAM_USER_UNKNOWN:
  77                         return "PAM_USER_UNKNOWN";
  78                 case PAM_MAXTRIES:
  79                         return "PAM_MAXTRIES";
  80                 case PAM_NEW_AUTHTOK_REQD:
  81                         return "PAM_NEW_AUTHTOK_REQD";
  82                 case PAM_ACCT_EXPIRED:
  83                         return "PAM_ACCT_EXPIRED";
  84                 case PAM_SESSION_ERR:
  85                         return "PAM_SESSION_ERR";
  86                 case PAM_CRED_UNAVAIL:
  87                         return "PAM_CRED_UNAVAIL";
  88                 case PAM_CRED_EXPIRED:
  89                         return "PAM_CRED_EXPIRED";
  90                 case PAM_CRED_ERR:
  91                         return "PAM_CRED_ERR";
  92                 case PAM_NO_MODULE_DATA:
  93                         return "PAM_NO_MODULE_DATA";
  94                 case PAM_CONV_ERR:
  95                         return "PAM_CONV_ERR";
  96                 case PAM_AUTHTOK_ERR:
  97                         return "PAM_AUTHTOK_ERR";
  98                 case PAM_AUTHTOK_RECOVER_ERR:
  99                         return "PAM_AUTHTOK_RECOVER_ERR";
 100                 case PAM_AUTHTOK_LOCK_BUSY:
 101                         return "PAM_AUTHTOK_LOCK_BUSY";
 102                 case PAM_AUTHTOK_DISABLE_AGING:
 103                         return "PAM_AUTHTOK_DISABLE_AGING";
 104                 case PAM_TRY_AGAIN:
 105                         return "PAM_TRY_AGAIN";
 106                 case PAM_IGNORE:
 107                         return "PAM_IGNORE";
 108                 case PAM_ABORT:
 109                         return "PAM_ABORT";
 110                 case PAM_AUTHTOK_EXPIRED:
 111                         return "PAM_AUTHTOK_EXPIRED";
 112 #ifdef PAM_MODULE_UNKNOWN
 113                 case PAM_MODULE_UNKNOWN:
 114                         return "PAM_MODULE_UNKNOWN";
 115 #endif
 116 #ifdef PAM_BAD_ITEM
 117                 case PAM_BAD_ITEM:
 118                         return "PAM_BAD_ITEM";
 119 #endif
 120 #ifdef PAM_CONV_AGAIN
 121                 case PAM_CONV_AGAIN:
 122                         return "PAM_CONV_AGAIN";
 123 #endif
 124 #ifdef PAM_INCOMPLETE
 125                 case PAM_INCOMPLETE:
 126                         return "PAM_INCOMPLETE";
 127 #endif
 128                 default:
 129                         return NULL;
 130         }
 131 }
 132
 133 #define _PAM_LOG_FUNCTION_ENTER(function, ctx) \
 134         do { \
 135                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] ENTER: " \
 136                                function " (flags: 0x%04x)", ctx->pamh, ctx->flags); \
 137                 _pam_log_state(ctx); \
 138         } while (0)
 139
 140 #define _PAM_LOG_FUNCTION_LEAVE(function, ctx, retval) \
 141         do { \
 142                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] LEAVE: " \
 143                                function " returning %d (%s)", ctx->pamh, retval, \
 144                                _pam_error_code_str(retval)); \
 145                 _pam_log_state(ctx); \
 146         } while (0)
 147
 148 /* data tokens */
 149
 150 #define MAX_PASSWD_TRIES        3
 151
 152 #ifdef HAVE_GETTEXT
 153 static char initialized = 0;
 154
 155 static inline void textdomain_init(void);
 156 static inline void textdomain_init(void)
 157 {
 158         if (!initialized) {
 159                 bindtextdomain(MODULE_NAME, LOCALEDIR);
 160                 initialized = 1;
 161         }
 162         return;
 163 }
 164 #endif
 165
 166
 167 /* some syslogging */
 168
 169 #ifdef HAVE_PAM_VSYSLOG
 170 static void _pam_log_int(const pam_handle_t *pamh,
 171                          int err,
 172                          const char *format,
 173                          va_list args)
 174 {
 175         pam_vsyslog(pamh, err, format, args);
 176 }
 177 #else
 178 static void _pam_log_int(const pam_handle_t *pamh,
 179                          int err,
 180                          const char *format,
 181                          va_list args)
 182 {
 183         char *format2 = NULL;
 184         const char *service;
 185
 186         pam_get_item(pamh, PAM_SERVICE, (const void **) &service);
 187
 188         format2 = (char *)malloc(strlen(MODULE_NAME)+strlen(format)+strlen(service)+5);
 189         if (format2 == NULL) {
 190                 /* what else todo ? */
 191                 vsyslog(err, format, args);
 192                 return;
 193         }
 194
 195         sprintf(format2, "%s(%s): %s", MODULE_NAME, service, format);
 196         vsyslog(err, format2, args);
 197         SAFE_FREE(format2);
 198 }
 199 #endif /* HAVE_PAM_VSYSLOG */
 200
 201 static bool _pam_log_is_silent(int ctrl)
 202 {
 203         return on(ctrl, WINBIND_SILENT);
 204 }
 205
 206 static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 207 static void _pam_log(struct pwb_context *r, int err, const char *format, ...)
 208 {
 209         va_list args;
 210
 211         if (_pam_log_is_silent(r->ctrl)) {
 212                 return;
 213         }
 214
 215         va_start(args, format);
 216         _pam_log_int(r->pamh, err, format, args);
 217         va_end(args);
 218 }
 219 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 220 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 221 {
 222         va_list args;
 223
 224         if (_pam_log_is_silent(ctrl)) {
 225                 return;
 226         }
 227
 228         va_start(args, format);
 229         _pam_log_int(pamh, err, format, args);
 230         va_end(args);
 231 }
 232
 233 static bool _pam_log_is_debug_enabled(int ctrl)
 234 {
 235         if (ctrl == -1) {
 236                 return false;
 237         }
 238
 239         if (_pam_log_is_silent(ctrl)) {
 240                 return false;
 241         }
 242
 243         if (!(ctrl & WINBIND_DEBUG_ARG)) {
 244                 return false;
 245         }
 246
 247         return true;
 248 }
 249
 250 static bool _pam_log_is_debug_state_enabled(int ctrl)
 251 {
 252         if (!(ctrl & WINBIND_DEBUG_STATE)) {
 253                 return false;
 254         }
 255
 256         return _pam_log_is_debug_enabled(ctrl);
 257 }
 258
 259 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 260 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...)
 261 {
 262         va_list args;
 263
 264         if (!_pam_log_is_debug_enabled(r->ctrl)) {
 265                 return;
 266         }
 267
 268         va_start(args, format);
 269         _pam_log_int(r->pamh, err, format, args);
 270         va_end(args);
 271 }
 272 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 273 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 274 {
 275         va_list args;
 276
 277         if (!_pam_log_is_debug_enabled(ctrl)) {
 278                 return;
 279         }
 280
 281         va_start(args, format);
 282         _pam_log_int(pamh, err, format, args);
 283         va_end(args);
 284 }
 285
 286 static void _pam_log_state_datum(struct pwb_context *ctx,
 287                                  int item_type,
 288                                  const char *key,
 289                                  int is_string)
 290 {
 291         const void *data = NULL;
 292         if (item_type != 0) {
 293                 pam_get_item(ctx->pamh, item_type, &data);
 294         } else {
 295                 pam_get_data(ctx->pamh, key, &data);
 296         }
 297         if (data != NULL) {
 298                 const char *type = (item_type != 0) ? "ITEM" : "DATA";
 299                 if (is_string != 0) {
 300                         _pam_log_debug(ctx, LOG_DEBUG,
 301                                        "[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
 302                                        ctx->pamh, type, key, (const char *)data,
 303                                        data);
 304                 } else {
 305                         _pam_log_debug(ctx, LOG_DEBUG,
 306                                        "[pamh: %p] STATE: %s(%s) = %p",
 307                                        ctx->pamh, type, key, data);
 308                 }
 309         }
 310 }
 311
 312 #define _PAM_LOG_STATE_DATA_POINTER(ctx, module_data_name) \
 313         _pam_log_state_datum(ctx, 0, module_data_name, 0)
 314
 315 #define _PAM_LOG_STATE_DATA_STRING(ctx, module_data_name) \
 316         _pam_log_state_datum(ctx, 0, module_data_name, 1)
 317
 318 #define _PAM_LOG_STATE_ITEM_POINTER(ctx, item_type) \
 319         _pam_log_state_datum(ctx, item_type, #item_type, 0)
 320
 321 #define _PAM_LOG_STATE_ITEM_STRING(ctx, item_type) \
 322         _pam_log_state_datum(ctx, item_type, #item_type, 1)
 323
 324 #ifdef DEBUG_PASSWORD
 325 #define _LOG_PASSWORD_AS_STRING 1
 326 #else
 327 #define _LOG_PASSWORD_AS_STRING 0
 328 #endif
 329
 330 #define _PAM_LOG_STATE_ITEM_PASSWORD(ctx, item_type) \
 331         _pam_log_state_datum(ctx, item_type, #item_type, \
 332                              _LOG_PASSWORD_AS_STRING)
 333
 334 static void _pam_log_state(struct pwb_context *ctx)
 335 {
 336         if (!_pam_log_is_debug_state_enabled(ctx->ctrl)) {
 337                 return;
 338         }
 339
 340         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
 341         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
 342         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
 343         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
 344         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
 345         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
 346         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
 347         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
 348         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
 349 #ifdef PAM_FAIL_DELAY
 350         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
 351 #endif
 352 #ifdef PAM_REPOSITORY
 353         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
 354 #endif
 355
 356         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
 357         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
 358         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
 359         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
 360         _PAM_LOG_STATE_DATA_STRING(ctx,
 361                                    PAM_WINBIND_NEW_AUTHTOK_REQD);
 362                                    /* Use atoi to get PAM result code */
 363         _PAM_LOG_STATE_DATA_STRING(ctx,
 364                                    PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
 365         _PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
 366 }
 367
 368 static int _pam_parse(const pam_handle_t *pamh,
 369                       int flags,
 370                       int argc,
 371                       const char **argv,
 372                       dictionary **result_d)
 373 {
 374         int ctrl = 0;
 375         const char *config_file = NULL;
 376         int i;
 377         const char **v;
 378         dictionary *d = NULL;
 379
 380         if (flags & PAM_SILENT) {
 381                 ctrl |= WINBIND_SILENT;
 382         }
 383
 384         for (i=argc,v=argv; i-- > 0; ++v) {
 385                 if (!strncasecmp(*v, "config", strlen("config"))) {
 386                         ctrl |= WINBIND_CONFIG_FILE;
 387                         config_file = v[i];
 388                         break;
 389                 }
 390         }
 391
 392         if (config_file == NULL) {
 393                 config_file = PAM_WINBIND_CONFIG_FILE;
 394         }
 395
 396         d = iniparser_load(discard_const_p(char, config_file));
 397         if (d == NULL) {
 398                 goto config_from_pam;
 399         }
 400
 401         if (iniparser_getboolean(d, discard_const_p(char, "global:debug"), false)) {
 402                 ctrl |= WINBIND_DEBUG_ARG;
 403         }
 404
 405         if (iniparser_getboolean(d, discard_const_p(char, "global:debug_state"), false)) {
 406                 ctrl |= WINBIND_DEBUG_STATE;
 407         }
 408
 409         if (iniparser_getboolean(d, discard_const_p(char, "global:cached_login"), false)) {
 410                 ctrl |= WINBIND_CACHED_LOGIN;
 411         }
 412
 413         if (iniparser_getboolean(d, discard_const_p(char, "global:krb5_auth"), false)) {
 414                 ctrl |= WINBIND_KRB5_AUTH;
 415         }
 416
 417         if (iniparser_getboolean(d, discard_const_p(char, "global:silent"), false)) {
 418                 ctrl |= WINBIND_SILENT;
 419         }
 420
 421         if (iniparser_getstring(d, discard_const_p(char, "global:krb5_ccache_type"), NULL) != NULL) {
 422                 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 423         }
 424
 425         if ((iniparser_getstring(d, discard_const_p(char, "global:require-membership-of"), NULL)
 426              != NULL) ||
 427             (iniparser_getstring(d, discard_const_p(char, "global:require_membership_of"), NULL)
 428              != NULL)) {
 429                 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 430         }
 431
 432         if (iniparser_getboolean(d, discard_const_p(char, "global:try_first_pass"), false)) {
 433                 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 434         }
 435
 436         if (iniparser_getint(d, discard_const_p(char, "global:warn_pwd_expire"), 0)) {
 437                 ctrl |= WINBIND_WARN_PWD_EXPIRE;
 438         }
 439
 440         if (iniparser_getboolean(d, discard_const_p(char, "global:mkhomedir"), false)) {
 441                 ctrl |= WINBIND_MKHOMEDIR;
 442         }
 443
 444 config_from_pam:
 445         /* step through arguments */
 446         for (i=argc,v=argv; i-- > 0; ++v) {
 447
 448                 /* generic options */
 449                 if (!strcmp(*v,"debug"))
 450                         ctrl |= WINBIND_DEBUG_ARG;
 451                 else if (!strcasecmp(*v, "debug_state"))
 452                         ctrl |= WINBIND_DEBUG_STATE;
 453                 else if (!strcasecmp(*v, "silent"))
 454                         ctrl |= WINBIND_SILENT;
 455                 else if (!strcasecmp(*v, "use_authtok"))
 456                         ctrl |= WINBIND_USE_AUTHTOK_ARG;
 457                 else if (!strcasecmp(*v, "use_first_pass"))
 458                         ctrl |= WINBIND_USE_FIRST_PASS_ARG;
 459                 else if (!strcasecmp(*v, "try_first_pass"))
 460                         ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 461                 else if (!strcasecmp(*v, "unknown_ok"))
 462                         ctrl |= WINBIND_UNKNOWN_OK_ARG;
 463                 else if (!strncasecmp(*v, "require_membership_of",
 464                                       strlen("require_membership_of")))
 465                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 466                 else if (!strncasecmp(*v, "require-membership-of",
 467                                       strlen("require-membership-of")))
 468                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 469                 else if (!strcasecmp(*v, "krb5_auth"))
 470                         ctrl |= WINBIND_KRB5_AUTH;
 471                 else if (!strncasecmp(*v, "krb5_ccache_type",
 472                                       strlen("krb5_ccache_type")))
 473                         ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 474                 else if (!strcasecmp(*v, "cached_login"))
 475                         ctrl |= WINBIND_CACHED_LOGIN;
 476                 else if (!strcasecmp(*v, "mkhomedir"))
 477                         ctrl |= WINBIND_MKHOMEDIR;
 478                 else {
 479                         __pam_log(pamh, ctrl, LOG_ERR,
 480                                  "pam_parse: unknown option: %s", *v);
 481                         return -1;
 482                 }
 483
 484         }
 485
 486         if (result_d) {
 487                 *result_d = d;
 488         } else {
 489                 if (d) {
 490                         iniparser_freedict(d);
 491                 }
 492         }
 493
 494         return ctrl;
 495 };
 496
 497 static int _pam_winbind_free_context(struct pwb_context *ctx)
 498 {
 499         if (!ctx) {
 500                 return 0;
 501         }
 502
 503         if (ctx->dict) {
 504                 iniparser_freedict(ctx->dict);
 505         }
 506
 507         return 0;
 508 }
 509
 510 static int _pam_winbind_init_context(pam_handle_t *pamh,
 511                                      int flags,
 512                                      int argc,
 513                                      const char **argv,
 514                                      struct pwb_context **ctx_p)
 515 {
 516         struct pwb_context *r = NULL;
 517
 518 #ifdef HAVE_GETTEXT
 519         textdomain_init();
 520 #endif
 521
 522         r = talloc_zero(NULL, struct pwb_context);
 523         if (!r) {
 524                 return PAM_BUF_ERR;
 525         }
 526
 527         talloc_set_destructor(r, _pam_winbind_free_context);
 528
 529         r->pamh = pamh;
 530         r->flags = flags;
 531         r->argc = argc;
 532         r->argv = argv;
 533         r->ctrl = _pam_parse(pamh, flags, argc, argv, &r->dict);
 534         if (r->ctrl == -1) {
 535                 TALLOC_FREE(r);
 536                 return PAM_SYSTEM_ERR;
 537         }
 538
 539         *ctx_p = r;
 540
 541         return PAM_SUCCESS;
 542 }
 543
 544 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
 545                                       void *data,
 546                                       int error_status)
 547 {
 548         int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
 549         if (_pam_log_is_debug_state_enabled(ctrl)) {
 550                 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
 551                                "[pamh: %p] CLEAN: cleaning up PAM data %p "
 552                                "(error_status = %d)", pamh, data,
 553                                error_status);
 554         }
 555         TALLOC_FREE(data);
 556 }
 557
 558
 559 static const struct ntstatus_errors {
 560         const char *ntstatus_string;
 561         const char *error_string;
 562 } ntstatus_errors[] = {
 563         {"NT_STATUS_OK",
 564                 N_("Success")},
 565         {"NT_STATUS_BACKUP_CONTROLLER",
 566                 N_("No primary Domain Controler available")},
 567         {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
 568                 N_("No domain controllers found")},
 569         {"NT_STATUS_NO_LOGON_SERVERS",
 570                 N_("No logon servers")},
 571         {"NT_STATUS_PWD_TOO_SHORT",
 572                 N_("Password too short")},
 573         {"NT_STATUS_PWD_TOO_RECENT",
 574                 N_("The password of this user is too recent to change")},
 575         {"NT_STATUS_PWD_HISTORY_CONFLICT",
 576                 N_("Password is already in password history")},
 577         {"NT_STATUS_PASSWORD_EXPIRED",
 578                 N_("Your password has expired")},
 579         {"NT_STATUS_PASSWORD_MUST_CHANGE",
 580                 N_("You need to change your password now")},
 581         {"NT_STATUS_INVALID_WORKSTATION",
 582                 N_("You are not allowed to logon from this workstation")},
 583         {"NT_STATUS_INVALID_LOGON_HOURS",
 584                 N_("You are not allowed to logon at this time")},
 585         {"NT_STATUS_ACCOUNT_EXPIRED",
 586                 N_("Your account has expired. "
 587                    "Please contact your System administrator")}, /* SCNR */
 588         {"NT_STATUS_ACCOUNT_DISABLED",
 589                 N_("Your account is disabled. "
 590                    "Please contact your System administrator")}, /* SCNR */
 591         {"NT_STATUS_ACCOUNT_LOCKED_OUT",
 592                 N_("Your account has been locked. "
 593                    "Please contact your System administrator")}, /* SCNR */
 594         {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
 595                 N_("Invalid Trust Account")},
 596         {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
 597                 N_("Invalid Trust Account")},
 598         {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
 599                 N_("Invalid Trust Account")},
 600         {"NT_STATUS_ACCESS_DENIED",
 601                 N_("Access is denied")},
 602         {NULL, NULL}
 603 };
 604
 605 static const char *_get_ntstatus_error_string(const char *nt_status_string)
 606 {
 607         int i;
 608         for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
 609                 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
 610                                 nt_status_string)) {
 611                         return _(ntstatus_errors[i].error_string);
 612                 }
 613         }
 614         return NULL;
 615 }
 616
 617 /* --- authentication management functions --- */
 618
 619 /* Attempt a conversation */
 620
 621 static int converse(const pam_handle_t *pamh,
 622                     int nargs,
 623                     struct pam_message **message,
 624                     struct pam_response **response)
 625 {
 626         int retval;
 627         struct pam_conv *conv;
 628
 629         retval = pam_get_item(pamh, PAM_CONV, (const void **) &conv);
 630         if (retval == PAM_SUCCESS) {
 631                 retval = conv->conv(nargs,
 632                                     (const struct pam_message **)message,
 633                                     response, conv->appdata_ptr);
 634         }
 635
 636         return retval; /* propagate error status */
 637 }
 638
 639
 640 static int _make_remark(struct pwb_context *ctx,
 641                         int type,
 642                         const char *text)
 643 {
 644         int retval = PAM_SUCCESS;
 645
 646         struct pam_message *pmsg[1], msg[1];
 647         struct pam_response *resp;
 648
 649         if (ctx->flags & WINBIND_SILENT) {
 650                 return PAM_SUCCESS;
 651         }
 652
 653         pmsg[0] = &msg[0];
 654         msg[0].msg = discard_const_p(char, text);
 655         msg[0].msg_style = type;
 656
 657         resp = NULL;
 658         retval = converse(ctx->pamh, 1, pmsg, &resp);
 659
 660         if (resp) {
 661                 _pam_drop_reply(resp, 1);
 662         }
 663         return retval;
 664 }
 665
 666 static int _make_remark_v(struct pwb_context *ctx,
 667                           int type,
 668                           const char *format,
 669                           va_list args)
 670 {
 671         char *var;
 672         int ret;
 673
 674         ret = vasprintf(&var, format, args);
 675         if (ret < 0) {
 676                 _pam_log(ctx, LOG_ERR, "memory allocation failure");
 677                 return ret;
 678         }
 679
 680         ret = _make_remark(ctx, type, var);
 681         SAFE_FREE(var);
 682         return ret;
 683 }
 684
 685 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 686 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
 687 {
 688         int ret;
 689         va_list args;
 690
 691         va_start(args, format);
 692         ret = _make_remark_v(ctx, type, format, args);
 693         va_end(args);
 694         return ret;
 695 }
 696
 697 static int pam_winbind_request_log(struct pwb_context *ctx,
 698                                    int retval,
 699                                    const char *user,
 700                                    const char *fn)
 701 {
 702         switch (retval) {
 703         case PAM_AUTH_ERR:
 704                 /* incorrect password */
 705                 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
 706                          "(incorrect password or invalid membership)", user);
 707                 return retval;
 708         case PAM_ACCT_EXPIRED:
 709                 /* account expired */
 710                 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
 711                          user);
 712                 return retval;
 713         case PAM_AUTHTOK_EXPIRED:
 714                 /* password expired */
 715                 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
 716                          user);
 717                 return retval;
 718         case PAM_NEW_AUTHTOK_REQD:
 719                 /* new password required */
 720                 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
 721                          "required", user);
 722                 return retval;
 723         case PAM_USER_UNKNOWN:
 724                 /* the user does not exist */
 725                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
 726                                user);
 727                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
 728                         return PAM_IGNORE;
 729                 }
 730                 return retval;
 731         case PAM_SUCCESS:
 732                 /* Otherwise, the authentication looked good */
 733                 if (strcmp(fn, "wbcLogonUser") == 0) {
 734                         _pam_log(ctx, LOG_NOTICE,
 735                                  "user '%s' granted access", user);
 736                 } else {
 737                         _pam_log(ctx, LOG_NOTICE,
 738                                  "user '%s' OK", user);
 739                 }
 740                 return retval;
 741         default:
 742                 /* we don't know anything about this return value */
 743                 _pam_log(ctx, LOG_ERR,
 744                          "internal module error (retval = %s(%d), user = '%s')",
 745                         _pam_error_code_str(retval), retval, user);
 746                 return retval;
 747         }
 748 }
 749
 750 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
 751                                        struct wbcAuthErrorInfo *e,
 752                                        wbcErr status,
 753                                        const char *username,
 754                                        const char *fn)
 755 {
 756         int ret = PAM_AUTH_ERR;
 757
 758         if (WBC_ERROR_IS_OK(status)) {
 759                 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
 760                         fn);
 761                 ret = PAM_SUCCESS;
 762                 return pam_winbind_request_log(ctx, ret, username, fn);
 763         }
 764
 765         if (e) {
 766                 if (e->pam_error != PAM_SUCCESS) {
 767                         _pam_log(ctx, LOG_ERR,
 768                                  "request %s failed: %s, "
 769                                  "PAM error: %s (%d), NTSTATUS: %s, "
 770                                  "Error message was: %s",
 771                                  fn,
 772                                  wbcErrorString(status),
 773                                  _pam_error_code_str(e->pam_error),
 774                                  e->pam_error,
 775                                  e->nt_string,
 776                                  e->display_string);
 777                         ret = e->pam_error;
 778                         return pam_winbind_request_log(ctx, ret, username, fn);
 779                 }
 780
 781                 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
 782
 783                 ret = PAM_SERVICE_ERR;
 784                 return pam_winbind_request_log(ctx, ret, username, fn);
 785         }
 786
 787         ret = wbc_error_to_pam_error(status);
 788         return pam_winbind_request_log(ctx, ret, username, fn);
 789 }
 790
 791 #if defined(HAVE_PAM_RADIO_TYPE)
 792 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 793 {
 794         struct pam_message msg, *pmsg;
 795         struct pam_response *resp = NULL;
 796         int ret;
 797         bool retval = false;
 798         pmsg = &msg;
 799         msg.msg_style = PAM_RADIO_TYPE;
 800         msg.msg = _("Do you want to change your password now?");
 801         ret = converse(ctx->pamh, 1, &pmsg, &resp);
 802         if (resp == NULL) {
 803                 if (ret == PAM_SUCCESS) {
 804                         _pam_log(ctx, LOG_CRIT, "pam_winbind: system error!\n");
 805                         return false;
 806                 }
 807         }
 808         if (ret != PAM_SUCCESS) {
 809                 return false;
 810         }
 811         _pam_log(ctx, LOG_CRIT, "Received [%s] reply from application.\n", resp->resp);
 812
 813         if ((resp->resp != NULL) && (strcasecmp(resp->resp, "yes") == 0)) {
 814                 retval = true;
 815         }
 816
 817         _pam_drop_reply(resp, 1);
 818         return retval;
 819 }
 820 #else
 821 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 822 {
 823         return false;
 824 }
 825 #endif
 826
 827 /**
 828  * send a password expiry message if required
 829  *
 830  * @param ctx PAM winbind context.
 831  * @param next_change expected (calculated) next expiry date.
 832  * @param already_expired pointer to a boolean to indicate if the password is
 833  *        already expired.
 834  *
 835  * @return boolean Returns true if message has been sent, false if not.
 836  */
 837
 838 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
 839                                               time_t next_change,
 840                                               time_t now,
 841                                               int warn_pwd_expire,
 842                                               bool *already_expired,
 843                                               bool *change_pwd)
 844 {
 845         int days = 0;
 846         struct tm tm_now, tm_next_change;
 847         bool retval = false;
 848         int ret;
 849
 850         if (already_expired) {
 851                 *already_expired = false;
 852         }
 853
 854         if (change_pwd) {
 855                 *change_pwd = false;
 856         }
 857
 858         if (next_change <= now) {
 859                 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
 860                 if (already_expired) {
 861                         *already_expired = true;
 862                 }
 863                 return true;
 864         }
 865
 866         if ((next_change < 0) ||
 867             (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
 868                 return false;
 869         }
 870
 871         if ((localtime_r(&now, &tm_now) == NULL) ||
 872             (localtime_r(&next_change, &tm_next_change) == NULL)) {
 873                 return false;
 874         }
 875
 876         days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
 877                (tm_now.tm_yday+tm_now.tm_year*365);
 878
 879         if (days == 0) {
 880                 ret = _make_remark(ctx, PAM_TEXT_INFO,
 881                                 _("Your password expires today.\n"));
 882
 883                 /*
 884                  * If change_pwd and already_expired is null.
 885                  * We are just sending a notification message.
 886                  * We don't expect any response in this case.
 887                  */
 888
 889                 if (!change_pwd && !already_expired) {
 890                         return true;
 891                 }
 892
 893                 /*
 894                  * successfully sent the warning message.
 895                  * Give the user a chance to change pwd.
 896                  */
 897                 if (ret == PAM_SUCCESS) {
 898                         if (change_pwd) {
 899                                 retval = _pam_winbind_change_pwd(ctx);
 900                                 if (retval) {
 901                                         *change_pwd = true;
 902                                 }
 903                         }
 904                 }
 905                 return true;
 906         }
 907
 908         if (days > 0 && days < warn_pwd_expire) {
 909
 910                 ret = _make_remark_format(ctx, PAM_TEXT_INFO,
 911                                         _("Your password will expire in %d %s.\n"),
 912                                         days, (days > 1) ? _("days"):_("day"));
 913                 /*
 914                  * If change_pwd and already_expired is null.
 915                  * We are just sending a notification message.
 916                  * We don't expect any response in this case.
 917                  */
 918
 919                 if (!change_pwd && !already_expired) {
 920                         return true;
 921                 }
 922
 923                 /*
 924                  * successfully sent the warning message.
 925                  * Give the user a chance to change pwd.
 926                  */
 927                 if (ret == PAM_SUCCESS) {
 928                         if (change_pwd) {
 929                                 retval = _pam_winbind_change_pwd(ctx);
 930                                 if (retval) {
 931                                         *change_pwd = true;
 932                                 }
 933                         }
 934                 }
 935                 return true;
 936         }
 937
 938         return false;
 939 }
 940
 941 /**
 942  * Send a warning if the password expires in the near future
 943  *
 944  * @param ctx PAM winbind context.
 945  * @param response The full authentication response structure.
 946  * @param already_expired boolean, is the pwd already expired?
 947  *
 948  * @return void.
 949  */
 950
 951 static void _pam_warn_password_expiry(struct pwb_context *ctx,
 952                                       const struct wbcAuthUserInfo *info,
 953                                       const struct wbcUserPasswordPolicyInfo *policy,
 954                                       int warn_pwd_expire,
 955                                       bool *already_expired,
 956                                       bool *change_pwd)
 957 {
 958         time_t now = time(NULL);
 959         time_t next_change = 0;
 960
 961         if (!info || !policy) {
 962                 return;
 963         }
 964
 965         if (already_expired) {
 966                 *already_expired = false;
 967         }
 968
 969         if (change_pwd) {
 970                 *change_pwd = false;
 971         }
 972
 973         /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
 974         if (info->acct_flags & WBC_ACB_PWNOEXP) {
 975                 return;
 976         }
 977
 978         /* no point in sending a warning if this is a grace logon */
 979         if (PAM_WB_GRACE_LOGON(info->user_flags)) {
 980                 return;
 981         }
 982
 983         /* check if the info3 must change timestamp has been set */
 984         next_change = info->pass_must_change_time;
 985
 986         if (_pam_send_password_expiry_message(ctx, next_change, now,
 987                                               warn_pwd_expire,
 988                                               already_expired,
 989                                               change_pwd)) {
 990                 return;
 991         }
 992
 993         /* now check for the global password policy */
 994         /* good catch from Ralf Haferkamp: an expiry of "never" is translated
 995          * to -1 */
 996         if ((policy->expire == (int64_t)-1) ||
 997             (policy->expire == 0)) {
 998                 return;
 999         }
1000
1001         next_change = info->pass_last_set_time + policy->expire;
1002
1003         if (_pam_send_password_expiry_message(ctx, next_change, now,
1004                                               warn_pwd_expire,
1005                                               already_expired,
1006                                               change_pwd)) {
1007                 return;
1008         }
1009
1010         /* no warning sent */
1011 }
1012
1013 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
1014
1015 /**
1016  * Append a string, making sure not to overflow and to always return a
1017  * NULL-terminated string.
1018  *
1019  * @param dest Destination string buffer (must already be NULL-terminated).
1020  * @param src Source string buffer.
1021  * @param dest_buffer_size Size of dest buffer in bytes.
1022  *
1023  * @return false if dest buffer is not big enough (no bytes copied), true on
1024  * success.
1025  */
1026
1027 static bool safe_append_string(char *dest,
1028                                const char *src,
1029                                int dest_buffer_size)
1030 {
1031         int dest_length = strlen(dest);
1032         int src_length = strlen(src);
1033
1034         if (dest_length + src_length + 1 > dest_buffer_size) {
1035                 return false;
1036         }
1037
1038         memcpy(dest + dest_length, src, src_length + 1);
1039         return true;
1040 }
1041
1042 /**
1043  * Convert a names into a SID string, appending it to a buffer.
1044  *
1045  * @param ctx PAM winbind context.
1046  * @param user User in PAM request.
1047  * @param name Name to convert.
1048  * @param sid_list_buffer Where to append the string sid.
1049  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1050  *
1051  * @return false on failure, true on success.
1052  */
1053 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
1054                                        const char *user,
1055                                        const char *name,
1056                                        char *sid_list_buffer,
1057                                        int sid_list_buffer_size)
1058 {
1059         char sid_string[WBC_SID_STRING_BUFLEN];
1060
1061         /* lookup name? */
1062         if (IS_SID_STRING(name)) {
1063                 strlcpy(sid_string, name, sizeof(sid_string));
1064         } else {
1065                 wbcErr wbc_status;
1066                 struct wbcDomainSid sid;
1067                 enum wbcSidType type;
1068
1069                 _pam_log_debug(ctx, LOG_DEBUG,
1070                                "no sid given, looking up: %s\n", name);
1071
1072                 wbc_status = wbcLookupName("", name, &sid, &type);
1073                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1074                         _pam_log(ctx, LOG_INFO,
1075                                  "could not lookup name: %s\n", name);
1076                         return false;
1077                 }
1078
1079                 wbcSidToStringBuf(&sid, sid_string, sizeof(sid_string));
1080         }
1081
1082         if (!safe_append_string(sid_list_buffer, sid_string,
1083                                 sid_list_buffer_size)) {
1084                 return false;
1085         }
1086         return true;
1087 }
1088
1089 /**
1090  * Convert a list of names into a list of sids.
1091  *
1092  * @param ctx PAM winbind context.
1093  * @param user User in PAM request.
1094  * @param name_list List of names or string sids, separated by commas.
1095  * @param sid_list_buffer Where to put the list of string sids.
1096  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1097  *
1098  * @return false on failure, true on success.
1099  */
1100 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1101                                                  const char *user,
1102                                                  const char *name_list,
1103                                                  char *sid_list_buffer,
1104                                                  int sid_list_buffer_size)
1105 {
1106         bool result = false;
1107         char *current_name = NULL;
1108         const char *search_location;
1109         const char *comma;
1110         int len;
1111
1112         if (sid_list_buffer_size > 0) {
1113                 sid_list_buffer[0] = 0;
1114         }
1115
1116         search_location = name_list;
1117         while ((comma = strchr(search_location, ',')) != NULL) {
1118                 current_name = strndup(search_location,
1119                                        comma - search_location);
1120                 if (NULL == current_name) {
1121                         goto out;
1122                 }
1123
1124                 if (!winbind_name_to_sid_string(ctx, user,
1125                                                 current_name,
1126                                                 sid_list_buffer,
1127                                                 sid_list_buffer_size)) {
1128                         /*
1129                          * If one group name failed, we must not fail
1130                          * the authentication totally, continue with
1131                          * the following group names. If user belongs to
1132                          * one of the valid groups, we must allow it
1133                          * login. -- BoYang
1134                          */
1135
1136                         _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1137                                  "check if group %s is valid group.", current_name,
1138                                  current_name);
1139                         _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1140                                         "to sid, please contact your administrator to see "
1141                                         "if group %s is valid."), current_name, current_name);
1142                         SAFE_FREE(current_name);
1143                         search_location = comma + 1;
1144                         continue;
1145                 }
1146
1147                 SAFE_FREE(current_name);
1148
1149                 if (!safe_append_string(sid_list_buffer, ",",
1150                                         sid_list_buffer_size)) {
1151                         goto out;
1152                 }
1153
1154                 search_location = comma + 1;
1155         }
1156
1157         if (!winbind_name_to_sid_string(ctx, user, search_location,
1158                                         sid_list_buffer,
1159                                         sid_list_buffer_size)) {
1160                 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1161                          "check if group %s is valid group.", search_location,
1162                          search_location);
1163                 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1164                                 "to sid, please contact your administrator to see "
1165                                 "if group %s is valid."), search_location, search_location);
1166                 /*
1167                  * The lookup of the last name failed..
1168                  * It results in require_member_of_sid ends with ','
1169                  * It is malformated parameter here, overwrite the last ','.
1170                  */
1171                 len = strlen(sid_list_buffer);
1172                 if ((len != 0) && (sid_list_buffer[len - 1] == ',')) {
1173                         sid_list_buffer[len - 1] = '\0';
1174                 }
1175         }
1176
1177         result = true;
1178
1179 out:
1180         SAFE_FREE(current_name);
1181         return result;
1182 }
1183
1184 /**
1185  * put krb5ccname variable into environment
1186  *
1187  * @param ctx PAM winbind context.
1188  * @param krb5ccname env variable retrieved from winbindd.
1189  *
1190  * @return void.
1191  */
1192
1193 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1194                                 struct wbcLogonUserInfo *info)
1195 {
1196         char *var = NULL;
1197         int ret;
1198         uint32_t i;
1199         const char *krb5ccname = NULL;
1200
1201         if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1202                 return;
1203         }
1204
1205         if (!info) {
1206                 return;
1207         }
1208
1209         for (i=0; i < info->num_blobs; i++) {
1210                 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1211                         krb5ccname = (const char *)info->blobs[i].blob.data;
1212                         break;
1213                 }
1214         }
1215
1216         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1217                 return;
1218         }
1219
1220         _pam_log_debug(ctx, LOG_DEBUG,
1221                        "request returned KRB5CCNAME: %s", krb5ccname);
1222
1223         if (asprintf(&var, "KRB5CCNAME=%s", krb5ccname) == -1) {
1224                 return;
1225         }
1226
1227         ret = pam_putenv(ctx->pamh, var);
1228         if (ret) {
1229                 _pam_log(ctx, LOG_ERR,
1230                          "failed to set KRB5CCNAME to %s: %s",
1231                          var, pam_strerror(ctx->pamh, ret));
1232         }
1233         free(var);
1234 }
1235
1236 /**
1237  * Copy unix username if available (further processed in PAM).
1238  *
1239  * @param ctx PAM winbind context
1240  * @param user_ret A pointer that holds a pointer to a string
1241  * @param unix_username A username
1242  *
1243  * @return void.
1244  */
1245
1246 static void _pam_setup_unix_username(struct pwb_context *ctx,
1247                                      char **user_ret,
1248                                      struct wbcLogonUserInfo *info)
1249 {
1250         const char *unix_username = NULL;
1251         uint32_t i;
1252
1253         if (!user_ret || !info) {
1254                 return;
1255         }
1256
1257         for (i=0; i < info->num_blobs; i++) {
1258                 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1259                         unix_username = (const char *)info->blobs[i].blob.data;
1260                         break;
1261                 }
1262         }
1263
1264         if (!unix_username || !unix_username[0]) {
1265                 return;
1266         }
1267
1268         *user_ret = strdup(unix_username);
1269 }
1270
1271 /**
1272  * Set string into the PAM stack.
1273  *
1274  * @param ctx PAM winbind context.
1275  * @param data_name Key name for pam_set_data.
1276  * @param value String value.
1277  *
1278  * @return void.
1279  */
1280
1281 static void _pam_set_data_string(struct pwb_context *ctx,
1282                                  const char *data_name,
1283                                  const char *value)
1284 {
1285         int ret;
1286
1287         if (!data_name || !value || (strlen(data_name) == 0) ||
1288              (strlen(value) == 0)) {
1289                 return;
1290         }
1291
1292         ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1293                            _pam_winbind_cleanup_func);
1294         if (ret) {
1295                 _pam_log_debug(ctx, LOG_DEBUG,
1296                                "Could not set data %s: %s\n",
1297                                data_name, pam_strerror(ctx->pamh, ret));
1298         }
1299 }
1300
1301 /**
1302  * Set info3 strings into the PAM stack.
1303  *
1304  * @param ctx PAM winbind context.
1305  * @param data_name Key name for pam_set_data.
1306  * @param value String value.
1307  *
1308  * @return void.
1309  */
1310
1311 static void _pam_set_data_info3(struct pwb_context *ctx,
1312                                 const struct wbcAuthUserInfo *info)
1313 {
1314         _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1315                              info->home_directory);
1316         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1317                              info->logon_script);
1318         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1319                              info->logon_server);
1320         _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1321                              info->profile_path);
1322 }
1323
1324 /**
1325  * Free info3 strings in the PAM stack.
1326  *
1327  * @param pamh PAM handle
1328  *
1329  * @return void.
1330  */
1331
1332 static void _pam_free_data_info3(pam_handle_t *pamh)
1333 {
1334         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1335         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1336         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1337         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1338 }
1339
1340 /**
1341  * Send PAM_ERROR_MSG for cached or grace logons.
1342  *
1343  * @param ctx PAM winbind context.
1344  * @param username User in PAM request.
1345  * @param info3_user_flgs Info3 flags containing logon type bits.
1346  *
1347  * @return void.
1348  */
1349
1350 static void _pam_warn_logon_type(struct pwb_context *ctx,
1351                                  const char *username,
1352                                  uint32_t info3_user_flgs)
1353 {
1354         /* inform about logon type */
1355         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1356
1357                 _make_remark(ctx, PAM_ERROR_MSG,
1358                              _("Grace login. "
1359                                "Please change your password as soon you're "
1360                                "online again"));
1361                 _pam_log_debug(ctx, LOG_DEBUG,
1362                                "User %s logged on using grace logon\n",
1363                                username);
1364
1365         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1366
1367                 _make_remark(ctx, PAM_ERROR_MSG,
1368                              _("Domain Controller unreachable, "
1369                                "using cached credentials instead. "
1370                                "Network resources may be unavailable"));
1371                 _pam_log_debug(ctx, LOG_DEBUG,
1372                                "User %s logged on using cached credentials\n",
1373                                username);
1374         }
1375 }
1376
1377 /**
1378  * Send PAM_ERROR_MSG for krb5 errors.
1379  *
1380  * @param ctx PAM winbind context.
1381  * @param username User in PAM request.
1382  * @param info3_user_flgs Info3 flags containing logon type bits.
1383  *
1384  * @return void.
1385  */
1386
1387 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1388                                    const char *username,
1389                                    uint32_t info3_user_flgs)
1390 {
1391         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1392                 _make_remark(ctx, PAM_ERROR_MSG,
1393                              _("Failed to establish your Kerberos Ticket cache "
1394                                "due time differences\n"
1395                                "with the domain controller.  "
1396                                "Please verify the system time.\n"));
1397                 _pam_log_debug(ctx, LOG_DEBUG,
1398                                "User %s: Clock skew when getting Krb5 TGT\n",
1399                                username);
1400         }
1401 }
1402
1403 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1404                                        const struct wbcAuthErrorInfo *e,
1405                                        const char *nt_status_string,
1406                                        int *pam_err)
1407 {
1408         const char *ntstatus = NULL;
1409         const char *error_string = NULL;
1410
1411         if (!e || !pam_err) {
1412                 return false;
1413         }
1414
1415         ntstatus = e->nt_string;
1416         if (!ntstatus) {
1417                 return false;
1418         }
1419
1420         if (strcasecmp(ntstatus, nt_status_string) == 0) {
1421
1422                 error_string = _get_ntstatus_error_string(nt_status_string);
1423                 if (error_string) {
1424                         _make_remark(ctx, PAM_ERROR_MSG, error_string);
1425                         *pam_err = e->pam_error;
1426                         return true;
1427                 }
1428
1429                 if (e->display_string) {
1430                         _make_remark(ctx, PAM_ERROR_MSG, _(e->display_string));
1431                         *pam_err = e->pam_error;
1432                         return true;
1433                 }
1434
1435                 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1436                 *pam_err = e->pam_error;
1437
1438                 return true;
1439         }
1440
1441         return false;
1442 };
1443
1444 /**
1445  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1446  *
1447  * @param i The wbcUserPasswordPolicyInfo struct.
1448  *
1449  * @return string (caller needs to talloc_free).
1450  */
1451
1452 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1453                                                  struct wbcUserPasswordPolicyInfo *i)
1454 {
1455         char *str = NULL;
1456
1457         if (!i) {
1458                 goto failed;
1459         }
1460
1461         str = talloc_asprintf(ctx, _("Your password "));
1462         if (!str) {
1463                 goto failed;
1464         }
1465
1466         if (i->min_length_password > 0) {
1467                 str = talloc_asprintf_append(str,
1468                                _("must be at least %d characters; "),
1469                                i->min_length_password);
1470                 if (!str) {
1471                         goto failed;
1472                 }
1473         }
1474
1475         if (i->password_history > 0) {
1476                 str = talloc_asprintf_append(str,
1477                                _("cannot repeat any of your previous %d "
1478                                 "passwords; "),
1479                                i->password_history);
1480                 if (!str) {
1481                         goto failed;
1482                 }
1483         }
1484
1485         if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1486                 str = talloc_asprintf_append(str,
1487                                _("must contain capitals, numerals "
1488                                  "or punctuation; "
1489                                  "and cannot contain your account "
1490                                  "or full name; "));
1491                 if (!str) {
1492                         goto failed;
1493                 }
1494         }
1495
1496         str = talloc_asprintf_append(str,
1497                        _("Please type a different password. "
1498                          "Type a password which meets these requirements in "
1499                          "both text boxes."));
1500         if (!str) {
1501                 goto failed;
1502         }
1503
1504         return str;
1505
1506  failed:
1507         TALLOC_FREE(str);
1508         return NULL;
1509 }
1510
1511 static int _pam_create_homedir(struct pwb_context *ctx,
1512                                const char *dirname,
1513                                mode_t mode)
1514 {
1515         struct stat sbuf;
1516
1517         if (stat(dirname, &sbuf) == 0) {
1518                 return PAM_SUCCESS;
1519         }
1520
1521         if (mkdir(dirname, mode) != 0) {
1522
1523                 _make_remark_format(ctx, PAM_TEXT_INFO,
1524                                     _("Creating directory: %s failed: %s"),
1525                                     dirname, strerror(errno));
1526                 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1527                  dirname, strerror(errno));
1528                  return PAM_PERM_DENIED;
1529         }
1530
1531         return PAM_SUCCESS;
1532 }
1533
1534 static int _pam_chown_homedir(struct pwb_context *ctx,
1535                               const char *dirname,
1536                               uid_t uid,
1537                               gid_t gid)
1538 {
1539         if (chown(dirname, uid, gid) != 0) {
1540                 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1541                          dirname, strerror(errno));
1542                 return PAM_PERM_DENIED;
1543         }
1544
1545         return PAM_SUCCESS;
1546 }
1547
1548 static int _pam_mkhomedir(struct pwb_context *ctx)
1549 {
1550         struct passwd *pwd = NULL;
1551         char *token = NULL;
1552         char *create_dir = NULL;
1553         char *user_dir = NULL;
1554         int ret;
1555         const char *username;
1556         mode_t mode = 0700;
1557         char *safe_ptr = NULL;
1558         char *p = NULL;
1559
1560         /* Get the username */
1561         ret = pam_get_user(ctx->pamh, &username, NULL);
1562         if ((ret != PAM_SUCCESS) || (!username)) {
1563                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1564                 return PAM_SERVICE_ERR;
1565         }
1566
1567         pwd = getpwnam(username);
1568         if (pwd == NULL) {
1569                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1570                 return PAM_USER_UNKNOWN;
1571         }
1572         _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1573
1574         ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1575         if (ret == PAM_SUCCESS) {
1576                 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1577                                          pwd->pw_uid,
1578                                          pwd->pw_gid);
1579         }
1580
1581         if (ret == PAM_SUCCESS) {
1582                 return ret;
1583         }
1584
1585         /* maybe we need to create parent dirs */
1586         create_dir = talloc_strdup(ctx, "/");
1587         if (!create_dir) {
1588                 return PAM_BUF_ERR;
1589         }
1590
1591         /* find final directory */
1592         user_dir = strrchr(pwd->pw_dir, '/');
1593         if (!user_dir) {
1594                 return PAM_BUF_ERR;
1595         }
1596         user_dir++;
1597
1598         _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1599
1600         p = pwd->pw_dir;
1601
1602         while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1603
1604                 mode = 0755;
1605
1606                 p = NULL;
1607
1608                 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1609
1610                 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1611                 if (!create_dir) {
1612                         return PAM_BUF_ERR;
1613                 }
1614                 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1615
1616                 if (strcmp(token, user_dir) == 0) {
1617                         _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1618                         mode = 0700;
1619                 }
1620
1621                 ret = _pam_create_homedir(ctx, create_dir, mode);
1622                 if (ret) {
1623                         return ret;
1624                 }
1625         }
1626
1627         return _pam_chown_homedir(ctx, create_dir,
1628                                   pwd->pw_uid,
1629                                   pwd->pw_gid);
1630 }
1631
1632 /* talk to winbindd */
1633 static int winbind_auth_request(struct pwb_context *ctx,
1634                                 const char *user,
1635                                 const char *pass,
1636                                 const char *member,
1637                                 const char *cctype,
1638                                 const int warn_pwd_expire,
1639                                 struct wbcAuthErrorInfo **p_error,
1640                                 struct wbcLogonUserInfo **p_info,
1641                                 struct wbcUserPasswordPolicyInfo **p_policy,
1642                                 time_t *pwd_last_set,
1643                                 char **user_ret)
1644 {
1645         wbcErr wbc_status;
1646
1647         struct wbcLogonUserParams logon;
1648         char membership_of[1024];
1649         uid_t user_uid = -1;
1650         uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1651                          WBFLAG_PAM_GET_PWD_POLICY;
1652
1653         struct wbcLogonUserInfo *info = NULL;
1654         struct wbcAuthUserInfo *user_info = NULL;
1655         struct wbcAuthErrorInfo *error = NULL;
1656         struct wbcUserPasswordPolicyInfo *policy = NULL;
1657
1658         int ret = PAM_AUTH_ERR;
1659         int i;
1660         const char *codes[] = {
1661                 "NT_STATUS_PASSWORD_EXPIRED",
1662                 "NT_STATUS_PASSWORD_MUST_CHANGE",
1663                 "NT_STATUS_INVALID_WORKSTATION",
1664                 "NT_STATUS_INVALID_LOGON_HOURS",
1665                 "NT_STATUS_ACCOUNT_EXPIRED",
1666                 "NT_STATUS_ACCOUNT_DISABLED",
1667                 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1668                 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1669                 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1670                 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1671                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1672                 "NT_STATUS_NO_LOGON_SERVERS",
1673                 "NT_STATUS_WRONG_PASSWORD",
1674                 "NT_STATUS_ACCESS_DENIED"
1675         };
1676
1677         if (pwd_last_set) {
1678                 *pwd_last_set = 0;
1679         }
1680
1681         /* Krb5 auth always has to go against the KDC of the user's realm */
1682
1683         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1684                 flags           |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1685         }
1686
1687         if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1688                 struct passwd *pwd = NULL;
1689
1690                 pwd = getpwnam(user);
1691                 if (pwd == NULL) {
1692                         return PAM_USER_UNKNOWN;
1693                 }
1694                 user_uid        = pwd->pw_uid;
1695         }
1696
1697         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1698
1699                 _pam_log_debug(ctx, LOG_DEBUG,
1700                                "enabling krb5 login flag\n");
1701
1702                 flags           |= WBFLAG_PAM_KRB5 |
1703                                    WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1704         }
1705
1706         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1707                 _pam_log_debug(ctx, LOG_DEBUG,
1708                                "enabling cached login flag\n");
1709                 flags           |= WBFLAG_PAM_CACHED_LOGIN;
1710         }
1711
1712         if (user_ret) {
1713                 *user_ret = NULL;
1714                 flags           |= WBFLAG_PAM_UNIX_NAME;
1715         }
1716
1717         if (cctype != NULL) {
1718                 _pam_log_debug(ctx, LOG_DEBUG,
1719                                "enabling request for a %s krb5 ccache\n",
1720                                cctype);
1721         }
1722
1723         if (member != NULL) {
1724
1725                 ZERO_STRUCT(membership_of);
1726
1727                 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1728                                                           membership_of,
1729                                                           sizeof(membership_of))) {
1730                         _pam_log_debug(ctx, LOG_ERR,
1731                                        "failed to serialize membership of sid "
1732                                        "\"%s\"\n", member);
1733                         return PAM_AUTH_ERR;
1734                 }
1735         }
1736
1737         ZERO_STRUCT(logon);
1738
1739         logon.username                  = user;
1740         logon.password                  = pass;
1741
1742         if (cctype) {
1743                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1744                                              &logon.blobs,
1745                                              "krb5_cc_type",
1746                                              0,
1747                                              discard_const_p(uint8_t, cctype),
1748                                              strlen(cctype)+1);
1749                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1750                         goto done;
1751                 }
1752         }
1753
1754         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1755                                      &logon.blobs,
1756                                      "flags",
1757                                      0,
1758                                      (uint8_t *)&flags,
1759                                      sizeof(flags));
1760         if (!WBC_ERROR_IS_OK(wbc_status)) {
1761                 goto done;
1762         }
1763
1764         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1765                                      &logon.blobs,
1766                                      "user_uid",
1767                                      0,
1768                                      (uint8_t *)&user_uid,
1769                                      sizeof(user_uid));
1770         if (!WBC_ERROR_IS_OK(wbc_status)) {
1771                 goto done;
1772         }
1773
1774         if (member) {
1775                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1776                                              &logon.blobs,
1777                                              "membership_of",
1778                                              0,
1779                                              (uint8_t *)membership_of,
1780                                              sizeof(membership_of));
1781                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1782                         goto done;
1783                 }
1784         }
1785
1786         wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1787         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1788                                           user, "wbcLogonUser");
1789         wbcFreeMemory(logon.blobs);
1790         logon.blobs = NULL;
1791
1792         if (info && info->info) {
1793                 user_info = info->info;
1794         }
1795
1796         if (pwd_last_set && user_info) {
1797                 *pwd_last_set = user_info->pass_last_set_time;
1798         }
1799
1800         if (p_info && info) {
1801                 *p_info = info;
1802         }
1803
1804         if (p_policy && policy) {
1805                 *p_policy = policy;
1806         }
1807
1808         if (p_error && error) {
1809                 /* We want to process the error in the caller. */
1810                 *p_error = error;
1811                 return ret;
1812         }
1813
1814         for (i=0; i<ARRAY_SIZE(codes); i++) {
1815                 int _ret = ret;
1816                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1817                         ret = _ret;
1818                         goto done;
1819                 }
1820         }
1821
1822         if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1823
1824                 bool already_expired = false;
1825                 bool change_pwd = false;
1826
1827                 /* warn a user if the password is about to expire soon */
1828                 _pam_warn_password_expiry(ctx, user_info, policy,
1829                                           warn_pwd_expire,
1830                                           &already_expired,
1831                                           &change_pwd);
1832
1833                 if (already_expired == true) {
1834
1835                         SMB_TIME_T last_set = user_info->pass_last_set_time;
1836
1837                         _pam_log_debug(ctx, LOG_DEBUG,
1838                                        "Password has expired "
1839                                        "(Password was last set: %lld, "
1840                                        "the policy says it should expire here "
1841                                        "%lld (now it's: %ld))\n",
1842                                        (long long int)last_set,
1843                                        (long long int)last_set +
1844                                        policy->expire,
1845                                        (long)time(NULL));
1846
1847                         return PAM_AUTHTOK_EXPIRED;
1848                 }
1849
1850                 if (change_pwd) {
1851                         ret = PAM_NEW_AUTHTOK_REQD;
1852                         goto done;
1853                 }
1854
1855                 /* inform about logon type */
1856                 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1857
1858                 /* inform about krb5 failures */
1859                 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1860
1861                 /* set some info3 info for other modules in the stack */
1862                 _pam_set_data_info3(ctx, user_info);
1863
1864                 /* put krb5ccname into env */
1865                 _pam_setup_krb5_env(ctx, info);
1866
1867                 /* If winbindd returned a username, return the pointer to it
1868                  * here. */
1869                 _pam_setup_unix_username(ctx, user_ret, info);
1870         }
1871
1872  done:
1873         wbcFreeMemory(logon.blobs);
1874         if (info && info->blobs && !p_info) {
1875                 wbcFreeMemory(info->blobs);
1876         }
1877         if (error && !p_error) {
1878                 wbcFreeMemory(error);
1879         }
1880         if (info && !p_info) {
1881                 wbcFreeMemory(info);
1882         }
1883         if (policy && !p_policy) {
1884                 wbcFreeMemory(policy);
1885         }
1886
1887         return ret;
1888 }
1889
1890 /* talk to winbindd */
1891 static int winbind_chauthtok_request(struct pwb_context *ctx,
1892                                      const char *user,
1893                                      const char *oldpass,
1894                                      const char *newpass,
1895                                      time_t pwd_last_set)
1896 {
1897         wbcErr wbc_status;
1898         struct wbcChangePasswordParams params;
1899         struct wbcAuthErrorInfo *error = NULL;
1900         struct wbcUserPasswordPolicyInfo *policy = NULL;
1901         enum wbcPasswordChangeRejectReason reject_reason = -1;
1902         uint32_t flags = 0;
1903
1904         int i;
1905         const char *codes[] = {
1906                 "NT_STATUS_BACKUP_CONTROLLER",
1907                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1908                 "NT_STATUS_NO_LOGON_SERVERS",
1909                 "NT_STATUS_ACCESS_DENIED",
1910                 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1911                 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1912                 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1913         };
1914         int ret = PAM_AUTH_ERR;
1915
1916         ZERO_STRUCT(params);
1917
1918         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1919                 flags |= WBFLAG_PAM_KRB5 |
1920                          WBFLAG_PAM_CONTACT_TRUSTDOM;
1921         }
1922
1923         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1924                 flags |= WBFLAG_PAM_CACHED_LOGIN;
1925         }
1926
1927         params.account_name             = user;
1928         params.level                    = WBC_CHANGE_PASSWORD_LEVEL_PLAIN;
1929         params.old_password.plaintext   = oldpass;
1930         params.new_password.plaintext   = newpass;
1931         params.flags                    = flags;
1932
1933         wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1934         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1935                                           user, "wbcChangeUserPasswordEx");
1936
1937         if (WBC_ERROR_IS_OK(wbc_status)) {
1938                 _pam_log(ctx, LOG_NOTICE,
1939                          "user '%s' password changed", user);
1940                 return PAM_SUCCESS;
1941         }
1942
1943         if (!error) {
1944                 wbcFreeMemory(policy);
1945                 return ret;
1946         }
1947
1948         for (i=0; i<ARRAY_SIZE(codes); i++) {
1949                 int _ret = ret;
1950                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1951                         ret = _ret;
1952                         goto done;
1953                 }
1954         }
1955
1956         if (!strcasecmp(error->nt_string,
1957                         "NT_STATUS_PASSWORD_RESTRICTION")) {
1958
1959                 char *pwd_restriction_string = NULL;
1960                 SMB_TIME_T min_pwd_age = 0;
1961
1962                 if (policy) {
1963                         min_pwd_age     = policy->min_passwordage;
1964                 }
1965
1966                 /* FIXME: avoid to send multiple PAM messages after another */
1967                 switch (reject_reason) {
1968                         case -1:
1969                                 break;
1970                         case WBC_PWD_CHANGE_NO_ERROR:
1971                                 if ((min_pwd_age > 0) &&
1972                                     (pwd_last_set + min_pwd_age > time(NULL))) {
1973                                         PAM_WB_REMARK_DIRECT(ctx,
1974                                              "NT_STATUS_PWD_TOO_RECENT");
1975                                 }
1976                                 break;
1977                         case WBC_PWD_CHANGE_PASSWORD_TOO_SHORT:
1978                                 PAM_WB_REMARK_DIRECT(ctx,
1979                                         "NT_STATUS_PWD_TOO_SHORT");
1980                                 break;
1981                         case WBC_PWD_CHANGE_PWD_IN_HISTORY:
1982                                 PAM_WB_REMARK_DIRECT(ctx,
1983                                         "NT_STATUS_PWD_HISTORY_CONFLICT");
1984                                 break;
1985                         case WBC_PWD_CHANGE_NOT_COMPLEX:
1986                                 _make_remark(ctx, PAM_ERROR_MSG,
1987                                              _("Password does not meet "
1988                                                "complexity requirements"));
1989                                 break;
1990                         default:
1991                                 _pam_log_debug(ctx, LOG_DEBUG,
1992                                                "unknown password change "
1993                                                "reject reason: %d",
1994                                                reject_reason);
1995                                 break;
1996                 }
1997
1998                 pwd_restriction_string =
1999                         _pam_compose_pwd_restriction_string(ctx, policy);
2000                 if (pwd_restriction_string) {
2001                         _make_remark(ctx, PAM_ERROR_MSG,
2002                                      pwd_restriction_string);
2003                         TALLOC_FREE(pwd_restriction_string);
2004                 }
2005         }
2006  done:
2007         wbcFreeMemory(error);
2008         wbcFreeMemory(policy);
2009
2010         return ret;
2011 }
2012
2013 /*
2014  * Checks if a user has an account
2015  *
2016  * return values:
2017  *       1  = User not found
2018  *       0  = OK
2019  *      -1  = System error
2020  */
2021 static int valid_user(struct pwb_context *ctx,
2022                       const char *user)
2023 {
2024         /* check not only if the user is available over NSS calls, also make
2025          * sure it's really a winbind user, this is important when stacking PAM
2026          * modules in the 'account' or 'password' facility. */
2027
2028         wbcErr wbc_status;
2029         struct passwd *pwd = NULL;
2030         struct passwd *wb_pwd = NULL;
2031
2032         pwd = getpwnam(user);
2033         if (pwd == NULL) {
2034                 return 1;
2035         }
2036
2037         wbc_status = wbcGetpwnam(user, &wb_pwd);
2038         wbcFreeMemory(wb_pwd);
2039         if (!WBC_ERROR_IS_OK(wbc_status)) {
2040                 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
2041                         wbcErrorString(wbc_status));
2042         }
2043
2044         switch (wbc_status) {
2045                 case WBC_ERR_UNKNOWN_USER:
2046                 /* match other insane libwbclient return codes */
2047                 case WBC_ERR_WINBIND_NOT_AVAILABLE:
2048                 case WBC_ERR_DOMAIN_NOT_FOUND:
2049                         return 1;
2050                 case WBC_ERR_SUCCESS:
2051                         return 0;
2052                 default:
2053                         break;
2054         }
2055         return -1;
2056 }
2057
2058 static char *_pam_delete(register char *xx)
2059 {
2060         _pam_overwrite(xx);
2061         _pam_drop(xx);
2062         return NULL;
2063 }
2064
2065 /*
2066  * obtain a password from the user
2067  */
2068
2069 static int _winbind_read_password(struct pwb_context *ctx,
2070                                   unsigned int ctrl,
2071                                   const char *comment,
2072                                   const char *prompt1,
2073                                   const char *prompt2,
2074                                   const char **pass)
2075 {
2076         int authtok_flag;
2077         int retval;
2078         const char *item;
2079         char *token;
2080
2081         _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2082
2083         /*
2084          * make sure nothing inappropriate gets returned
2085          */
2086
2087         *pass = token = NULL;
2088
2089         /*
2090          * which authentication token are we getting?
2091          */
2092
2093         if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2094                 authtok_flag = PAM_OLDAUTHTOK;
2095         } else {
2096                 authtok_flag = PAM_AUTHTOK;
2097         }
2098
2099         /*
2100          * should we obtain the password from a PAM item ?
2101          */
2102
2103         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2104             on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2105                 retval = pam_get_item(ctx->pamh,
2106                                       authtok_flag,
2107                                       (const void **) &item);
2108                 if (retval != PAM_SUCCESS) {
2109                         /* very strange. */
2110                         _pam_log(ctx, LOG_ALERT,
2111                                  "pam_get_item returned error "
2112                                  "to unix-read-password");
2113                         return retval;
2114                 } else if (item != NULL) {      /* we have a password! */
2115                         *pass = item;
2116                         item = NULL;
2117                         _pam_log(ctx, LOG_DEBUG,
2118                                  "pam_get_item returned a password");
2119                         return PAM_SUCCESS;
2120                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2121                         return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2122                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2123                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
2124                         return PAM_AUTHTOK_RECOVER_ERR;
2125                 }
2126         }
2127         /*
2128          * getting here implies we will have to get the password from the
2129          * user directly.
2130          */
2131
2132         {
2133                 struct pam_message msg[3], *pmsg[3];
2134                 struct pam_response *resp;
2135                 int i, replies;
2136
2137                 /* prepare to converse */
2138
2139                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2140                         pmsg[0] = &msg[0];
2141                         msg[0].msg_style = PAM_TEXT_INFO;
2142                         msg[0].msg = discard_const_p(char, comment);
2143                         i = 1;
2144                 } else {
2145                         i = 0;
2146                 }
2147
2148                 pmsg[i] = &msg[i];
2149                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2150                 msg[i++].msg = discard_const_p(char, prompt1);
2151                 replies = 1;
2152
2153                 if (prompt2 != NULL) {
2154                         pmsg[i] = &msg[i];
2155                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2156                         msg[i++].msg = discard_const_p(char, prompt2);
2157                         ++replies;
2158                 }
2159                 /* so call the conversation expecting i responses */
2160                 resp = NULL;
2161                 retval = converse(ctx->pamh, i, pmsg, &resp);
2162                 if (resp == NULL) {
2163                         if (retval == PAM_SUCCESS) {
2164                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2165                         }
2166                         goto done;
2167                 }
2168                 if (retval != PAM_SUCCESS) {
2169                         _pam_drop_reply(resp, i);
2170                         goto done;
2171                 }
2172
2173                 /* interpret the response */
2174
2175                 token = x_strdup(resp[i - replies].resp);
2176                 if (!token) {
2177                         _pam_log(ctx, LOG_NOTICE,
2178                                  "could not recover "
2179                                  "authentication token");
2180                         retval = PAM_AUTHTOK_RECOVER_ERR;
2181                         goto done;
2182                 }
2183
2184                 if (replies == 2) {
2185                         /* verify that password entered correctly */
2186                         if (!resp[i - 1].resp ||
2187                             strcmp(token, resp[i - 1].resp)) {
2188                                 _pam_delete(token);     /* mistyped */
2189                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2190                                 _make_remark(ctx, PAM_ERROR_MSG,
2191                                              MISTYPED_PASS);
2192                         }
2193                 }
2194
2195                 /*
2196                  * tidy up the conversation (resp_retcode) is ignored
2197                  * -- what is it for anyway? AGM
2198                  */
2199                 _pam_drop_reply(resp, i);
2200         }
2201
2202  done:
2203         if (retval != PAM_SUCCESS) {
2204                 _pam_log_debug(ctx, LOG_DEBUG,
2205                                "unable to obtain a password");
2206                 return retval;
2207         }
2208         /* 'token' is the entered password */
2209
2210         /* we store this password as an item */
2211
2212         retval = pam_set_item(ctx->pamh, authtok_flag, token);
2213         _pam_delete(token);     /* clean it up */
2214         if (retval != PAM_SUCCESS ||
2215             (retval = pam_get_item(ctx->pamh, authtok_flag, (const void **) &item)) != PAM_SUCCESS) {
2216
2217                 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2218                 return retval;
2219
2220         }
2221
2222         *pass = item;
2223         item = NULL;            /* break link to password */
2224
2225         return PAM_SUCCESS;
2226 }
2227
2228 static const char *get_conf_item_string(struct pwb_context *ctx,
2229                                         const char *item,
2230                                         int config_flag)
2231 {
2232         int i = 0;
2233         const char *parm_opt = NULL;
2234
2235         if (!(ctx->ctrl & config_flag)) {
2236                 goto out;
2237         }
2238
2239         /* let the pam opt take precedence over the pam_winbind.conf option */
2240         for (i=0; i<ctx->argc; i++) {
2241
2242                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2243                         char *p;
2244
2245                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2246                                 _pam_log(ctx, LOG_INFO,
2247                                          "no \"=\" delimiter for \"%s\" found\n",
2248                                          item);
2249                                 goto out;
2250                         }
2251                         _pam_log_debug(ctx, LOG_INFO,
2252                                        "PAM config: %s '%s'\n", item, p+1);
2253                         return p + 1;
2254                 }
2255         }
2256
2257         if (ctx->dict) {
2258                 char *key = NULL;
2259
2260                 key = talloc_asprintf(ctx, "global:%s", item);
2261                 if (!key) {
2262                         goto out;
2263                 }
2264
2265                 parm_opt = iniparser_getstring(ctx->dict, key, NULL);
2266                 TALLOC_FREE(key);
2267
2268                 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2269                                item, parm_opt);
2270         }
2271 out:
2272         return parm_opt;
2273 }
2274
2275 static int get_config_item_int(struct pwb_context *ctx,
2276                                const char *item,
2277                                int config_flag)
2278 {
2279         int i, parm_opt = -1;
2280
2281         if (!(ctx->ctrl & config_flag)) {
2282                 goto out;
2283         }
2284
2285         /* let the pam opt take precedence over the pam_winbind.conf option */
2286         for (i = 0; i < ctx->argc; i++) {
2287
2288                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2289                         char *p;
2290
2291                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2292                                 _pam_log(ctx, LOG_INFO,
2293                                          "no \"=\" delimiter for \"%s\" found\n",
2294                                          item);
2295                                 goto out;
2296                         }
2297                         parm_opt = atoi(p + 1);
2298                         _pam_log_debug(ctx, LOG_INFO,
2299                                        "PAM config: %s '%d'\n",
2300                                        item, parm_opt);
2301                         return parm_opt;
2302                 }
2303         }
2304
2305         if (ctx->dict) {
2306                 char *key = NULL;
2307
2308                 key = talloc_asprintf(ctx, "global:%s", item);
2309                 if (!key) {
2310                         goto out;
2311                 }
2312
2313                 parm_opt = iniparser_getint(ctx->dict, key, -1);
2314                 TALLOC_FREE(key);
2315
2316                 _pam_log_debug(ctx, LOG_INFO,
2317                                "CONFIG file: %s '%d'\n",
2318                                item, parm_opt);
2319         }
2320 out:
2321         return parm_opt;
2322 }
2323
2324 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2325 {
2326         return get_conf_item_string(ctx, "krb5_ccache_type",
2327                                     WINBIND_KRB5_CCACHE_TYPE);
2328 }
2329
2330 static const char *get_member_from_config(struct pwb_context *ctx)
2331 {
2332         const char *ret = NULL;
2333         ret = get_conf_item_string(ctx, "require_membership_of",
2334                                    WINBIND_REQUIRED_MEMBERSHIP);
2335         if (ret) {
2336                 return ret;
2337         }
2338         return get_conf_item_string(ctx, "require-membership-of",
2339                                     WINBIND_REQUIRED_MEMBERSHIP);
2340 }
2341
2342 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2343 {
2344         int ret;
2345         ret = get_config_item_int(ctx, "warn_pwd_expire",
2346                                   WINBIND_WARN_PWD_EXPIRE);
2347         /* no or broken setting */
2348         if (ret <= 0) {
2349                 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2350         }
2351         return ret;
2352 }
2353
2354 /**
2355  * Retrieve the winbind separator.
2356  *
2357  * @param ctx PAM winbind context.
2358  *
2359  * @return string separator character. NULL on failure.
2360  */
2361
2362 static char winbind_get_separator(struct pwb_context *ctx)
2363 {
2364         wbcErr wbc_status;
2365         static struct wbcInterfaceDetails *details = NULL;
2366
2367         wbc_status = wbcInterfaceDetails(&details);
2368         if (!WBC_ERROR_IS_OK(wbc_status)) {
2369                 _pam_log(ctx, LOG_ERR,
2370                          "Could not retrieve winbind interface details: %s",
2371                          wbcErrorString(wbc_status));
2372                 return '\0';
2373         }
2374
2375         if (!details) {
2376                 return '\0';
2377         }
2378
2379         return details->winbind_separator;
2380 }
2381
2382
2383 /**
2384  * Convert a upn to a name.
2385  *
2386  * @param ctx PAM winbind context.
2387  * @param upn  USer UPN to be trabslated.
2388  *
2389  * @return converted name. NULL pointer on failure. Caller needs to free.
2390  */
2391
2392 static char* winbind_upn_to_username(struct pwb_context *ctx,
2393                                      const char *upn)
2394 {
2395         char sep;
2396         wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2397         struct wbcDomainSid sid;
2398         enum wbcSidType type;
2399         char *domain = NULL;
2400         char *name;
2401         char *p;
2402
2403         /* This cannot work when the winbind separator = @ */
2404
2405         sep = winbind_get_separator(ctx);
2406         if (!sep || sep == '@') {
2407                 return NULL;
2408         }
2409
2410         name = talloc_strdup(ctx, upn);
2411         if (!name) {
2412                 return NULL;
2413         }
2414         if ((p = strchr(name, '@')) != NULL) {
2415                 *p = 0;
2416                 domain = p + 1;
2417         }
2418
2419         /* Convert the UPN to a SID */
2420
2421         wbc_status = wbcLookupName(domain, name, &sid, &type);
2422         if (!WBC_ERROR_IS_OK(wbc_status)) {
2423                 return NULL;
2424         }
2425
2426         /* Convert the the SID back to the sAMAccountName */
2427
2428         wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2429         if (!WBC_ERROR_IS_OK(wbc_status)) {
2430                 return NULL;
2431         }
2432
2433         return talloc_asprintf(ctx, "%s\\%s", domain, name);
2434 }
2435
2436 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2437                          int argc, const char **argv)
2438 {
2439         int retval = PAM_SUCCESS;
2440         struct pwb_context *ctx = NULL;
2441         struct wbcLogoffUserParams logoff;
2442         struct wbcAuthErrorInfo *error = NULL;
2443         const char *user;
2444         wbcErr wbc_status = WBC_ERR_SUCCESS;
2445
2446         ZERO_STRUCT(logoff);
2447
2448         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2449         if (retval) {
2450                 goto out;
2451         }
2452
2453         _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2454
2455         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2456
2457                 /* destroy the ccache here */
2458
2459                 uint32_t wbc_flags = 0;
2460                 const char *ccname = NULL;
2461                 struct passwd *pwd = NULL;
2462
2463                 retval = pam_get_user(pamh, &user, _("Username: "));
2464                 if (retval) {
2465                         _pam_log(ctx, LOG_ERR,
2466                                  "could not identify user");
2467                         goto out;
2468                 }
2469
2470                 if (user == NULL) {
2471                         _pam_log(ctx, LOG_ERR,
2472                                  "username was NULL!");
2473                         retval = PAM_USER_UNKNOWN;
2474                         goto out;
2475                 }
2476
2477                 _pam_log_debug(ctx, LOG_DEBUG,
2478                                "username [%s] obtained", user);
2479
2480                 ccname = pam_getenv(pamh, "KRB5CCNAME");
2481                 if (ccname == NULL) {
2482                         _pam_log_debug(ctx, LOG_DEBUG,
2483                                        "user has no KRB5CCNAME environment");
2484                 }
2485
2486                 pwd = getpwnam(user);
2487                 if (pwd == NULL) {
2488                         retval = PAM_USER_UNKNOWN;
2489                         goto out;
2490                 }
2491
2492                 wbc_flags = WBFLAG_PAM_KRB5 |
2493                         WBFLAG_PAM_CONTACT_TRUSTDOM;
2494
2495                 logoff.username         = user;
2496
2497                 if (ccname) {
2498                         wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2499                                                      &logoff.blobs,
2500                                                      "ccfilename",
2501                                                      0,
2502                                                      discard_const_p(uint8_t, ccname),
2503                                                      strlen(ccname)+1);
2504                         if (!WBC_ERROR_IS_OK(wbc_status)) {
2505                                 goto out;
2506                         }
2507                 }
2508
2509                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2510                                              &logoff.blobs,
2511                                              "flags",
2512                                              0,
2513                                              (uint8_t *)&wbc_flags,
2514                                              sizeof(wbc_flags));
2515                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2516                         goto out;
2517                 }
2518
2519                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2520                                              &logoff.blobs,
2521                                              "user_uid",
2522                                              0,
2523                                              (uint8_t *)&pwd->pw_uid,
2524                                              sizeof(pwd->pw_uid));
2525                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2526                         goto out;
2527                 }
2528
2529                 wbc_status = wbcLogoffUserEx(&logoff, &error);
2530                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2531                                                      user, "wbcLogoffUser");
2532                 wbcFreeMemory(error);
2533                 wbcFreeMemory(logoff.blobs);
2534                 logoff.blobs = NULL;
2535
2536                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2537                         _pam_log(ctx, LOG_INFO,
2538                                  "failed to logoff user %s: %s\n",
2539                                          user, wbcErrorString(wbc_status));
2540                 }
2541         }
2542
2543 out:
2544         if (logoff.blobs) {
2545                 wbcFreeMemory(logoff.blobs);
2546         }
2547
2548         if (!WBC_ERROR_IS_OK(wbc_status)) {
2549                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2550                      user, "wbcLogoffUser");
2551         }
2552
2553         /*
2554          * Delete the krb5 ccname variable from the PAM environment
2555          * if it was set by winbind.
2556          */
2557         if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2558                 pam_putenv(pamh, "KRB5CCNAME");
2559         }
2560
2561         _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2562
2563         TALLOC_FREE(ctx);
2564
2565         return retval;
2566 }
2567
2568 PAM_EXTERN
2569 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2570                         int argc, const char **argv)
2571 {
2572         const char *username;
2573         const char *password;
2574         const char *member = NULL;
2575         const char *cctype = NULL;
2576         int warn_pwd_expire;
2577         int retval = PAM_AUTH_ERR;
2578         char *username_ret = NULL;
2579         char *new_authtok_required = NULL;
2580         char *real_username = NULL;
2581         struct pwb_context *ctx = NULL;
2582
2583         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2584         if (retval) {
2585                 goto out;
2586         }
2587
2588         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2589
2590         /* Get the username */
2591         retval = pam_get_user(pamh, &username, NULL);
2592         if ((retval != PAM_SUCCESS) || (!username)) {
2593                 _pam_log_debug(ctx, LOG_DEBUG,
2594                                "can not get the username");
2595                 retval = PAM_SERVICE_ERR;
2596                 goto out;
2597         }
2598
2599
2600 #if defined(AIX)
2601         /* Decode the user name since AIX does not support logn user
2602            names by default.  The name is encoded as _#uid.  */
2603
2604         if (username[0] == '_') {
2605                 uid_t id = atoi(&username[1]);
2606                 struct passwd *pw = NULL;
2607
2608                 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2609                         real_username = strdup(pw->pw_name);
2610                 }
2611         }
2612 #endif
2613
2614         if (!real_username) {
2615                 /* Just making a copy of the username we got from PAM */
2616                 if ((real_username = strdup(username)) == NULL) {
2617                         _pam_log_debug(ctx, LOG_DEBUG,
2618                                        "memory allocation failure when copying "
2619                                        "username");
2620                         retval = PAM_SERVICE_ERR;
2621                         goto out;
2622                 }
2623         }
2624
2625         /* Maybe this was a UPN */
2626
2627         if (strchr(real_username, '@') != NULL) {
2628                 char *samaccountname = NULL;
2629
2630                 samaccountname = winbind_upn_to_username(ctx,
2631                                                          real_username);
2632                 if (samaccountname) {
2633                         free(real_username);
2634                         real_username = strdup(samaccountname);
2635                 }
2636         }
2637
2638         retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2639                                         _("Password: "), NULL,
2640                                         &password);
2641
2642         if (retval != PAM_SUCCESS) {
2643                 _pam_log(ctx, LOG_ERR,
2644                          "Could not retrieve user's password");
2645                 retval = PAM_AUTHTOK_ERR;
2646                 goto out;
2647         }
2648
2649         /* Let's not give too much away in the log file */
2650
2651 #ifdef DEBUG_PASSWORD
2652         _pam_log_debug(ctx, LOG_INFO,
2653                        "Verify user '%s' with password '%s'",
2654                        real_username, password);
2655 #else
2656         _pam_log_debug(ctx, LOG_INFO,
2657                        "Verify user '%s'", real_username);
2658 #endif
2659
2660         member = get_member_from_config(ctx);
2661         cctype = get_krb5_cc_type_from_config(ctx);
2662         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2663
2664         /* Now use the username to look up password */
2665         retval = winbind_auth_request(ctx, real_username, password,
2666                                       member, cctype, warn_pwd_expire,
2667                                       NULL, NULL, NULL,
2668                                       NULL, &username_ret);
2669
2670         if (retval == PAM_NEW_AUTHTOK_REQD ||
2671             retval == PAM_AUTHTOK_EXPIRED) {
2672
2673                 char *new_authtok_required_during_auth = NULL;
2674
2675                 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2676                 if (!new_authtok_required) {
2677                         retval = PAM_BUF_ERR;
2678                         goto out;
2679                 }
2680
2681                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2682                              new_authtok_required,
2683                              _pam_winbind_cleanup_func);
2684
2685                 retval = PAM_SUCCESS;
2686
2687                 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2688                 if (!new_authtok_required_during_auth) {
2689                         retval = PAM_BUF_ERR;
2690                         goto out;
2691                 }
2692
2693                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2694                              new_authtok_required_during_auth,
2695                              _pam_winbind_cleanup_func);
2696
2697                 goto out;
2698         }
2699
2700 out:
2701         if (username_ret) {
2702                 pam_set_item (pamh, PAM_USER, username_ret);
2703                 _pam_log_debug(ctx, LOG_INFO,
2704                                "Returned user was '%s'", username_ret);
2705                 free(username_ret);
2706         }
2707
2708         if (real_username) {
2709                 free(real_username);
2710         }
2711
2712         if (!new_authtok_required) {
2713                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2714         }
2715
2716         if (retval != PAM_SUCCESS) {
2717                 _pam_free_data_info3(pamh);
2718         }
2719
2720         if (ctx != NULL) {
2721                 _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2722                 TALLOC_FREE(ctx);
2723         }
2724
2725         return retval;
2726 }
2727
2728 PAM_EXTERN
2729 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2730                    int argc, const char **argv)
2731 {
2732         int ret = PAM_SYSTEM_ERR;
2733         struct pwb_context *ctx = NULL;
2734
2735         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2736         if (ret) {
2737                 goto out;
2738         }
2739
2740         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2741
2742         switch (flags & ~PAM_SILENT) {
2743
2744                 case PAM_DELETE_CRED:
2745                         ret = _pam_delete_cred(pamh, flags, argc, argv);
2746                         break;
2747                 case PAM_REFRESH_CRED:
2748                         _pam_log_debug(ctx, LOG_WARNING,
2749                                        "PAM_REFRESH_CRED not implemented");
2750                         ret = PAM_SUCCESS;
2751                         break;
2752                 case PAM_REINITIALIZE_CRED:
2753                         _pam_log_debug(ctx, LOG_WARNING,
2754                                        "PAM_REINITIALIZE_CRED not implemented");
2755                         ret = PAM_SUCCESS;
2756                         break;
2757                 case PAM_ESTABLISH_CRED:
2758                         _pam_log_debug(ctx, LOG_WARNING,
2759                                        "PAM_ESTABLISH_CRED not implemented");
2760                         ret = PAM_SUCCESS;
2761                         break;
2762                 default:
2763                         ret = PAM_SYSTEM_ERR;
2764                         break;
2765         }
2766
2767  out:
2768
2769         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2770
2771         TALLOC_FREE(ctx);
2772
2773         return ret;
2774 }
2775
2776 /*
2777  * Account management. We want to verify that the account exists
2778  * before returning PAM_SUCCESS
2779  */
2780 PAM_EXTERN
2781 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2782                    int argc, const char **argv)
2783 {
2784         const char *username;
2785         int ret = PAM_USER_UNKNOWN;
2786         const char *tmp = NULL;
2787         struct pwb_context *ctx = NULL;
2788
2789         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2790         if (ret) {
2791                 goto out;
2792         }
2793
2794         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2795
2796
2797         /* Get the username */
2798         ret = pam_get_user(pamh, &username, NULL);
2799         if ((ret != PAM_SUCCESS) || (!username)) {
2800                 _pam_log_debug(ctx, LOG_DEBUG,
2801                                "can not get the username");
2802                 ret = PAM_SERVICE_ERR;
2803                 goto out;
2804         }
2805
2806         /* Verify the username */
2807         ret = valid_user(ctx, username);
2808         switch (ret) {
2809         case -1:
2810                 /* some sort of system error. The log was already printed */
2811                 ret = PAM_SERVICE_ERR;
2812                 goto out;
2813         case 1:
2814                 /* the user does not exist */
2815                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2816                                username);
2817                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2818                         ret = PAM_IGNORE;
2819                         goto out;
2820                 }
2821                 ret = PAM_USER_UNKNOWN;
2822                 goto out;
2823         case 0:
2824                 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2825                              (const void **)&tmp);
2826                 if (tmp != NULL) {
2827                         ret = atoi(tmp);
2828                         switch (ret) {
2829                         case PAM_AUTHTOK_EXPIRED:
2830                                 /* fall through, since new token is required in this case */
2831                         case PAM_NEW_AUTHTOK_REQD:
2832                                 _pam_log(ctx, LOG_WARNING,
2833                                          "pam_sm_acct_mgmt success but %s is set",
2834                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
2835                                 _pam_log(ctx, LOG_NOTICE,
2836                                          "user '%s' needs new password",
2837                                          username);
2838                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2839                                 ret = PAM_NEW_AUTHTOK_REQD;
2840                                 goto out;
2841                         default:
2842                                 _pam_log(ctx, LOG_WARNING,
2843                                          "pam_sm_acct_mgmt success");
2844                                 _pam_log(ctx, LOG_NOTICE,
2845                                          "user '%s' granted access", username);
2846                                 ret = PAM_SUCCESS;
2847                                 goto out;
2848                         }
2849                 }
2850
2851                 /* Otherwise, the authentication looked good */
2852                 _pam_log(ctx, LOG_NOTICE,
2853                          "user '%s' granted access", username);
2854                 ret = PAM_SUCCESS;
2855                 goto out;
2856         default:
2857                 /* we don't know anything about this return value */
2858                 _pam_log(ctx, LOG_ERR,
2859                          "internal module error (ret = %d, user = '%s')",
2860                          ret, username);
2861                 ret = PAM_SERVICE_ERR;
2862                 goto out;
2863         }
2864
2865         /* should not be reached */
2866         ret = PAM_IGNORE;
2867
2868  out:
2869
2870         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2871
2872         TALLOC_FREE(ctx);
2873
2874         return ret;
2875 }
2876
2877 PAM_EXTERN
2878 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2879                         int argc, const char **argv)
2880 {
2881         int ret = PAM_SUCCESS;
2882         struct pwb_context *ctx = NULL;
2883
2884         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2885         if (ret) {
2886                 goto out;
2887         }
2888
2889         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2890
2891         if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2892                 /* check and create homedir */
2893                 ret = _pam_mkhomedir(ctx);
2894         }
2895  out:
2896         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2897
2898         TALLOC_FREE(ctx);
2899
2900         return ret;
2901 }
2902
2903 PAM_EXTERN
2904 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2905                          int argc, const char **argv)
2906 {
2907         int ret = PAM_SUCCESS;
2908         struct pwb_context *ctx = NULL;
2909
2910         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2911         if (ret) {
2912                 goto out;
2913         }
2914
2915         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2916
2917 out:
2918         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2919
2920         TALLOC_FREE(ctx);
2921
2922         return ret;
2923 }
2924
2925 /**
2926  * evaluate whether we need to re-authenticate with kerberos after a
2927  * password change
2928  *
2929  * @param ctx PAM winbind context.
2930  * @param user The username
2931  *
2932  * @return boolean Returns true if required, false if not.
2933  */
2934
2935 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2936                                                    const char *user)
2937 {
2938
2939         /* Make sure that we only do this if a) the chauthtok got initiated
2940          * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2941          * later password change via the "passwd" command if done by the user
2942          * itself
2943          * NB. If we login from gdm or xdm and the password expires,
2944          * we change the password, but there is no memory cache.
2945          * Thus, even for passthrough login, we should do the
2946          * authentication again to update memory cache.
2947          * --- BoYang
2948          * */
2949
2950         char *new_authtok_reqd_during_auth = NULL;
2951         struct passwd *pwd = NULL;
2952
2953         pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2954                       (const void **) &new_authtok_reqd_during_auth);
2955         pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2956                      NULL, NULL);
2957
2958         if (new_authtok_reqd_during_auth) {
2959                 return true;
2960         }
2961
2962         pwd = getpwnam(user);
2963         if (!pwd) {
2964                 return false;
2965         }
2966
2967         if (getuid() == pwd->pw_uid) {
2968                 return true;
2969         }
2970
2971         return false;
2972 }
2973
2974
2975 PAM_EXTERN
2976 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2977                      int argc, const char **argv)
2978 {
2979         unsigned int lctrl;
2980         int ret;
2981         bool cached_login = false;
2982
2983         /* <DO NOT free() THESE> */
2984         const char *user;
2985         const char *pass_old;
2986         const char *pass_new;
2987         /* </DO NOT free() THESE> */
2988
2989         char *Announce;
2990
2991         int retry = 0;
2992         char *username_ret = NULL;
2993         struct wbcAuthErrorInfo *error = NULL;
2994         struct pwb_context *ctx = NULL;
2995
2996         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2997         if (ret) {
2998                 goto out;
2999         }
3000
3001         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
3002
3003         cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
3004
3005         /* clearing offline bit for auth */
3006         ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
3007
3008         /*
3009          * First get the name of a user
3010          */
3011         ret = pam_get_user(pamh, &user, _("Username: "));
3012         if (ret) {
3013                 _pam_log(ctx, LOG_ERR,
3014                          "password - could not identify user");
3015                 goto out;
3016         }
3017
3018         if (user == NULL) {
3019                 _pam_log(ctx, LOG_ERR, "username was NULL!");
3020                 ret = PAM_USER_UNKNOWN;
3021                 goto out;
3022         }
3023
3024         _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
3025
3026         /* check if this is really a user in winbindd, not only in NSS */
3027         ret = valid_user(ctx, user);
3028         switch (ret) {
3029                 case 1:
3030                         ret = PAM_USER_UNKNOWN;
3031                         goto out;
3032                 case -1:
3033                         ret = PAM_SYSTEM_ERR;
3034                         goto out;
3035                 default:
3036                         break;
3037         }
3038
3039         /*
3040          * obtain and verify the current password (OLDAUTHTOK) for
3041          * the user.
3042          */
3043
3044         if (flags & PAM_PRELIM_CHECK) {
3045                 time_t pwdlastset_prelim = 0;
3046
3047                 /* instruct user what is happening */
3048
3049 #define greeting _("Changing password for")
3050                 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
3051                 if (!Announce) {
3052                         _pam_log(ctx, LOG_CRIT,
3053                                  "password - out of memory");
3054                         ret = PAM_BUF_ERR;
3055                         goto out;
3056                 }
3057 #undef greeting
3058
3059                 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
3060                 ret = _winbind_read_password(ctx, lctrl,
3061                                                 Announce,
3062                                                 _("(current) NT password: "),
3063                                                 NULL,
3064                                                 (const char **) &pass_old);
3065                 TALLOC_FREE(Announce);
3066                 if (ret != PAM_SUCCESS) {
3067                         _pam_log(ctx, LOG_NOTICE,
3068                                  "password - (old) token not obtained");
3069                         goto out;
3070                 }
3071
3072                 /* verify that this is the password for this user */
3073
3074                 ret = winbind_auth_request(ctx, user, pass_old,
3075                                            NULL, NULL, 0,
3076                                            &error, NULL, NULL,
3077                                            &pwdlastset_prelim, NULL);
3078
3079                 if (ret != PAM_ACCT_EXPIRED &&
3080                     ret != PAM_AUTHTOK_EXPIRED &&
3081                     ret != PAM_NEW_AUTHTOK_REQD &&
3082                     ret != PAM_SUCCESS) {
3083                         pass_old = NULL;
3084                         goto out;
3085                 }
3086
3087                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3088                              (void *)pwdlastset_prelim, NULL);
3089
3090                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3091                                    (const void *) pass_old);
3092                 pass_old = NULL;
3093                 if (ret != PAM_SUCCESS) {
3094                         _pam_log(ctx, LOG_CRIT,
3095                                  "failed to set PAM_OLDAUTHTOK");
3096                 }
3097         } else if (flags & PAM_UPDATE_AUTHTOK) {
3098
3099                 time_t pwdlastset_update = 0;
3100
3101                 /*
3102                  * obtain the proposed password
3103                  */
3104
3105                 /*
3106                  * get the old token back.
3107                  */
3108
3109                 ret = pam_get_item(pamh, PAM_OLDAUTHTOK, (const void **) &pass_old);
3110
3111                 if (ret != PAM_SUCCESS) {
3112                         _pam_log(ctx, LOG_NOTICE,
3113                                  "user not authenticated");
3114                         goto out;
3115                 }
3116
3117                 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3118
3119                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3120                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3121                 }
3122                 retry = 0;
3123                 ret = PAM_AUTHTOK_ERR;
3124                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3125                         /*
3126                          * use_authtok is to force the use of a previously entered
3127                          * password -- needed for pluggable password strength checking
3128                          */
3129
3130                         ret = _winbind_read_password(ctx, lctrl,
3131                                                      NULL,
3132                                                      _("Enter new NT password: "),
3133                                                      _("Retype new NT password: "),
3134                                                      (const char **)&pass_new);
3135
3136                         if (ret != PAM_SUCCESS) {
3137                                 _pam_log_debug(ctx, LOG_ALERT,
3138                                                "password - "
3139                                                "new password not obtained");
3140                                 pass_old = NULL;/* tidy up */
3141                                 goto out;
3142                         }
3143
3144                         /*
3145                          * At this point we know who the user is and what they
3146                          * propose as their new password. Verify that the new
3147                          * password is acceptable.
3148                          */
3149
3150                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
3151                                 pass_new = NULL;
3152                         }
3153                 }
3154
3155                 /*
3156                  * By reaching here we have approved the passwords and must now
3157                  * rebuild the password database file.
3158                  */
3159                 pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3160                              (const void **) &pwdlastset_update);
3161
3162                 /*
3163                  * if cached creds were enabled, make sure to set the
3164                  * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3165                  * update the cached creds storage - gd
3166                  */
3167                 if (cached_login) {
3168                         ctx->ctrl |= WINBIND_CACHED_LOGIN;
3169                 }
3170
3171                 ret = winbind_chauthtok_request(ctx, user, pass_old,
3172                                                 pass_new, pwdlastset_update);
3173                 if (ret) {
3174                         pass_old = pass_new = NULL;
3175                         goto out;
3176                 }
3177
3178                 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3179
3180                         const char *member = NULL;
3181                         const char *cctype = NULL;
3182                         int warn_pwd_expire;
3183                         struct wbcLogonUserInfo *info = NULL;
3184                         struct wbcUserPasswordPolicyInfo *policy = NULL;
3185
3186                         member = get_member_from_config(ctx);
3187                         cctype = get_krb5_cc_type_from_config(ctx);
3188                         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3189
3190                         /* Keep WINBIND_CACHED_LOGIN bit for
3191                          * authentication after changing the password.
3192                          * This will update the cached credentials in case
3193                          * that winbindd_dual_pam_chauthtok() fails
3194                          * to update them.
3195                          * --- BoYang
3196                          * */
3197
3198                         ret = winbind_auth_request(ctx, user, pass_new,
3199                                                    member, cctype, 0,
3200                                                    &error, &info, &policy,
3201                                                    NULL, &username_ret);
3202                         pass_old = pass_new = NULL;
3203
3204                         if (ret == PAM_SUCCESS) {
3205
3206                                 struct wbcAuthUserInfo *user_info = NULL;
3207
3208                                 if (info && info->info) {
3209                                         user_info = info->info;
3210                                 }
3211
3212                                 /* warn a user if the password is about to
3213                                  * expire soon */
3214                                 _pam_warn_password_expiry(ctx, user_info, policy,
3215                                                           warn_pwd_expire,
3216                                                           NULL, NULL);
3217
3218                                 /* set some info3 info for other modules in the
3219                                  * stack */
3220                                 _pam_set_data_info3(ctx, user_info);
3221
3222                                 /* put krb5ccname into env */
3223                                 _pam_setup_krb5_env(ctx, info);
3224
3225                                 if (username_ret) {
3226                                         pam_set_item(pamh, PAM_USER,
3227                                                      username_ret);
3228                                         _pam_log_debug(ctx, LOG_INFO,
3229                                                        "Returned user was '%s'",
3230                                                        username_ret);
3231                                         free(username_ret);
3232                                 }
3233
3234                         }
3235
3236                         if (info && info->blobs) {
3237                                 wbcFreeMemory(info->blobs);
3238                         }
3239                         wbcFreeMemory(info);
3240                         wbcFreeMemory(policy);
3241
3242                         goto out;
3243                 }
3244         } else {
3245                 ret = PAM_SERVICE_ERR;
3246         }
3247
3248 out:
3249         {
3250                 /* Deal with offline errors. */
3251                 int i;
3252                 const char *codes[] = {
3253                         "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3254                         "NT_STATUS_NO_LOGON_SERVERS",
3255                         "NT_STATUS_ACCESS_DENIED"
3256                 };
3257
3258                 for (i=0; i<ARRAY_SIZE(codes); i++) {
3259                         int _ret;
3260                         if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3261                                 break;
3262                         }
3263                 }
3264         }
3265
3266         wbcFreeMemory(error);
3267
3268         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3269
3270         TALLOC_FREE(ctx);
3271
3272         return ret;
3273 }
3274
3275 #ifdef PAM_STATIC
3276
3277 /* static module data */
3278
3279 struct pam_module _pam_winbind_modstruct = {
3280         MODULE_NAME,
3281         pam_sm_authenticate,
3282         pam_sm_setcred,
3283         pam_sm_acct_mgmt,
3284         pam_sm_open_session,
3285         pam_sm_close_session,
3286         pam_sm_chauthtok
3287 };
3288
3289 #endif
3290
3291 /*
3292  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
3293  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
3294  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3295  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2008
3296  * Copyright (c) Jan Rêkorajski 1999.
3297  * Copyright (c) Andrew G. Morgan 1996-8.
3298  * Copyright (c) Alex O. Yuriev, 1996.
3299  * Copyright (c) Cristian Gafton 1996.
3300  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3301  *
3302  * Redistribution and use in source and binary forms, with or without
3303  * modification, are permitted provided that the following conditions
3304  * are met:
3305  * 1. Redistributions of source code must retain the above copyright
3306  *    notice, and the entire permission notice in its entirety,
3307  *    including the disclaimer of warranties.
3308  * 2. Redistributions in binary form must reproduce the above copyright
3309  *    notice, this list of conditions and the following disclaimer in the
3310  *    documentation and/or other materials provided with the distribution.
3311  * 3. The name of the author may not be used to endorse or promote
3312  *    products derived from this software without specific prior
3313  *    written permission.
3314  *
3315  * ALTERNATIVELY, this product may be distributed under the terms of
3316  * the GNU Public License, in which case the provisions of the GPL are
3317  * required INSTEAD OF the above restrictions.  (This clause is
3318  * necessary due to a potential bad interaction between the GPL and
3319  * the restrictions contained in a BSD-style copyright.)
3320  *
3321  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3322  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3323  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3324  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3325  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3326  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3327  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3328  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3329  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3330  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3331  * OF THE POSSIBILITY OF SUCH DAMAGE.
3332  */