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