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  * wrapper to preserve old behaviour of iniparser which ignored
 335  * key values that had no value assigned like
 336  *    key =
 337  * for a key like above newer iniparser will return a zero-length
 338  * string, previously iniparser would return NULL
 339  */
 340 static char *iniparser_getstring_nonempty(dictionary *d, char *key, char *def)
 341 {
 342         char *ret = iniparser_getstring(d, key, def);
 343         if (ret && strlen(ret) == 0) {
 344                 ret = NULL;
 345         }
 346         return ret;
 347 }
 348
 349 static void _pam_log_state(struct pwb_context *ctx)
 350 {
 351         if (!_pam_log_is_debug_state_enabled(ctx->ctrl)) {
 352                 return;
 353         }
 354
 355         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
 356         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
 357         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
 358         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
 359         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
 360         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
 361         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
 362         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
 363         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
 364 #ifdef PAM_FAIL_DELAY
 365         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
 366 #endif
 367 #ifdef PAM_REPOSITORY
 368         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
 369 #endif
 370
 371         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
 372         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
 373         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
 374         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
 375         _PAM_LOG_STATE_DATA_STRING(ctx,
 376                                    PAM_WINBIND_NEW_AUTHTOK_REQD);
 377                                    /* Use atoi to get PAM result code */
 378         _PAM_LOG_STATE_DATA_STRING(ctx,
 379                                    PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
 380         _PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
 381 }
 382
 383 static int _pam_parse(const pam_handle_t *pamh,
 384                       int flags,
 385                       int argc,
 386                       const char **argv,
 387                       dictionary **result_d)
 388 {
 389         int ctrl = 0;
 390         const char *config_file = NULL;
 391         int i;
 392         const char **v;
 393         dictionary *d = NULL;
 394
 395         if (flags & PAM_SILENT) {
 396                 ctrl |= WINBIND_SILENT;
 397         }
 398
 399         for (i=argc,v=argv; i-- > 0; ++v) {
 400                 if (!strncasecmp(*v, "config", strlen("config"))) {
 401                         ctrl |= WINBIND_CONFIG_FILE;
 402                         config_file = v[i];
 403                         break;
 404                 }
 405         }
 406
 407         if (config_file == NULL) {
 408                 config_file = PAM_WINBIND_CONFIG_FILE;
 409         }
 410
 411         d = iniparser_load(discard_const_p(char, config_file));
 412         if (d == NULL) {
 413                 goto config_from_pam;
 414         }
 415
 416         if (iniparser_getboolean(d, discard_const_p(char, "global:debug"), false)) {
 417                 ctrl |= WINBIND_DEBUG_ARG;
 418         }
 419
 420         if (iniparser_getboolean(d, discard_const_p(char, "global:debug_state"), false)) {
 421                 ctrl |= WINBIND_DEBUG_STATE;
 422         }
 423
 424         if (iniparser_getboolean(d, discard_const_p(char, "global:cached_login"), false)) {
 425                 ctrl |= WINBIND_CACHED_LOGIN;
 426         }
 427
 428         if (iniparser_getboolean(d, discard_const_p(char, "global:krb5_auth"), false)) {
 429                 ctrl |= WINBIND_KRB5_AUTH;
 430         }
 431
 432         if (iniparser_getboolean(d, discard_const_p(char, "global:silent"), false)) {
 433                 ctrl |= WINBIND_SILENT;
 434         }
 435
 436         if (iniparser_getstring_nonempty(d, discard_const_p(char, "global:krb5_ccache_type"), NULL) != NULL) {
 437                 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 438         }
 439
 440         if ((iniparser_getstring_nonempty(d, discard_const_p(char, "global:require-membership-of"), NULL)
 441              != NULL) ||
 442             (iniparser_getstring_nonempty(d, discard_const_p(char, "global:require_membership_of"), NULL)
 443              != NULL)) {
 444                 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 445         }
 446
 447         if (iniparser_getboolean(d, discard_const_p(char, "global:try_first_pass"), false)) {
 448                 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 449         }
 450
 451         if (iniparser_getint(d, discard_const_p(char, "global:warn_pwd_expire"), 0)) {
 452                 ctrl |= WINBIND_WARN_PWD_EXPIRE;
 453         }
 454
 455         if (iniparser_getboolean(d, discard_const_p(char, "global:mkhomedir"), false)) {
 456                 ctrl |= WINBIND_MKHOMEDIR;
 457         }
 458
 459 config_from_pam:
 460         /* step through arguments */
 461         for (i=argc,v=argv; i-- > 0; ++v) {
 462
 463                 /* generic options */
 464                 if (!strcmp(*v,"debug"))
 465                         ctrl |= WINBIND_DEBUG_ARG;
 466                 else if (!strcasecmp(*v, "debug_state"))
 467                         ctrl |= WINBIND_DEBUG_STATE;
 468                 else if (!strcasecmp(*v, "silent"))
 469                         ctrl |= WINBIND_SILENT;
 470                 else if (!strcasecmp(*v, "use_authtok"))
 471                         ctrl |= WINBIND_USE_AUTHTOK_ARG;
 472                 else if (!strcasecmp(*v, "use_first_pass"))
 473                         ctrl |= WINBIND_USE_FIRST_PASS_ARG;
 474                 else if (!strcasecmp(*v, "try_first_pass"))
 475                         ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 476                 else if (!strcasecmp(*v, "unknown_ok"))
 477                         ctrl |= WINBIND_UNKNOWN_OK_ARG;
 478                 else if (!strncasecmp(*v, "require_membership_of",
 479                                       strlen("require_membership_of")))
 480                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 481                 else if (!strncasecmp(*v, "require-membership-of",
 482                                       strlen("require-membership-of")))
 483                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 484                 else if (!strcasecmp(*v, "krb5_auth"))
 485                         ctrl |= WINBIND_KRB5_AUTH;
 486                 else if (!strncasecmp(*v, "krb5_ccache_type",
 487                                       strlen("krb5_ccache_type")))
 488                         ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 489                 else if (!strcasecmp(*v, "cached_login"))
 490                         ctrl |= WINBIND_CACHED_LOGIN;
 491                 else if (!strcasecmp(*v, "mkhomedir"))
 492                         ctrl |= WINBIND_MKHOMEDIR;
 493                 else {
 494                         __pam_log(pamh, ctrl, LOG_ERR,
 495                                  "pam_parse: unknown option: %s", *v);
 496                         return -1;
 497                 }
 498
 499         }
 500
 501         if (result_d) {
 502                 *result_d = d;
 503         } else {
 504                 if (d) {
 505                         iniparser_freedict(d);
 506                 }
 507         }
 508
 509         return ctrl;
 510 };
 511
 512 static int _pam_winbind_free_context(struct pwb_context *ctx)
 513 {
 514         if (!ctx) {
 515                 return 0;
 516         }
 517
 518         if (ctx->dict) {
 519                 iniparser_freedict(ctx->dict);
 520         }
 521
 522         return 0;
 523 }
 524
 525 static int _pam_winbind_init_context(pam_handle_t *pamh,
 526                                      int flags,
 527                                      int argc,
 528                                      const char **argv,
 529                                      struct pwb_context **ctx_p)
 530 {
 531         struct pwb_context *r = NULL;
 532
 533 #ifdef HAVE_GETTEXT
 534         textdomain_init();
 535 #endif
 536
 537         r = talloc_zero(NULL, struct pwb_context);
 538         if (!r) {
 539                 return PAM_BUF_ERR;
 540         }
 541
 542         talloc_set_destructor(r, _pam_winbind_free_context);
 543
 544         r->pamh = pamh;
 545         r->flags = flags;
 546         r->argc = argc;
 547         r->argv = argv;
 548         r->ctrl = _pam_parse(pamh, flags, argc, argv, &r->dict);
 549         if (r->ctrl == -1) {
 550                 TALLOC_FREE(r);
 551                 return PAM_SYSTEM_ERR;
 552         }
 553
 554         *ctx_p = r;
 555
 556         return PAM_SUCCESS;
 557 }
 558
 559 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
 560                                       void *data,
 561                                       int error_status)
 562 {
 563         int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
 564         if (_pam_log_is_debug_state_enabled(ctrl)) {
 565                 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
 566                                "[pamh: %p] CLEAN: cleaning up PAM data %p "
 567                                "(error_status = %d)", pamh, data,
 568                                error_status);
 569         }
 570         TALLOC_FREE(data);
 571 }
 572
 573
 574 static const struct ntstatus_errors {
 575         const char *ntstatus_string;
 576         const char *error_string;
 577 } ntstatus_errors[] = {
 578         {"NT_STATUS_OK",
 579                 N_("Success")},
 580         {"NT_STATUS_BACKUP_CONTROLLER",
 581                 N_("No primary Domain Controler available")},
 582         {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
 583                 N_("No domain controllers found")},
 584         {"NT_STATUS_NO_LOGON_SERVERS",
 585                 N_("No logon servers")},
 586         {"NT_STATUS_PWD_TOO_SHORT",
 587                 N_("Password too short")},
 588         {"NT_STATUS_PWD_TOO_RECENT",
 589                 N_("The password of this user is too recent to change")},
 590         {"NT_STATUS_PWD_HISTORY_CONFLICT",
 591                 N_("Password is already in password history")},
 592         {"NT_STATUS_PASSWORD_EXPIRED",
 593                 N_("Your password has expired")},
 594         {"NT_STATUS_PASSWORD_MUST_CHANGE",
 595                 N_("You need to change your password now")},
 596         {"NT_STATUS_INVALID_WORKSTATION",
 597                 N_("You are not allowed to logon from this workstation")},
 598         {"NT_STATUS_INVALID_LOGON_HOURS",
 599                 N_("You are not allowed to logon at this time")},
 600         {"NT_STATUS_ACCOUNT_EXPIRED",
 601                 N_("Your account has expired. "
 602                    "Please contact your System administrator")}, /* SCNR */
 603         {"NT_STATUS_ACCOUNT_DISABLED",
 604                 N_("Your account is disabled. "
 605                    "Please contact your System administrator")}, /* SCNR */
 606         {"NT_STATUS_ACCOUNT_LOCKED_OUT",
 607                 N_("Your account has been locked. "
 608                    "Please contact your System administrator")}, /* SCNR */
 609         {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
 610                 N_("Invalid Trust Account")},
 611         {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
 612                 N_("Invalid Trust Account")},
 613         {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
 614                 N_("Invalid Trust Account")},
 615         {"NT_STATUS_ACCESS_DENIED",
 616                 N_("Access is denied")},
 617         {NULL, NULL}
 618 };
 619
 620 static const char *_get_ntstatus_error_string(const char *nt_status_string)
 621 {
 622         int i;
 623         for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
 624                 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
 625                                 nt_status_string)) {
 626                         return _(ntstatus_errors[i].error_string);
 627                 }
 628         }
 629         return NULL;
 630 }
 631
 632 /* --- authentication management functions --- */
 633
 634 /* Attempt a conversation */
 635
 636 static int converse(const pam_handle_t *pamh,
 637                     int nargs,
 638                     struct pam_message **message,
 639                     struct pam_response **response)
 640 {
 641         int retval;
 642         struct pam_conv *conv;
 643
 644         retval = pam_get_item(pamh, PAM_CONV, (const void **) &conv);
 645         if (retval == PAM_SUCCESS) {
 646                 retval = conv->conv(nargs,
 647                                     (const struct pam_message **)message,
 648                                     response, conv->appdata_ptr);
 649         }
 650
 651         return retval; /* propagate error status */
 652 }
 653
 654
 655 static int _make_remark(struct pwb_context *ctx,
 656                         int type,
 657                         const char *text)
 658 {
 659         int retval = PAM_SUCCESS;
 660
 661         struct pam_message *pmsg[1], msg[1];
 662         struct pam_response *resp;
 663
 664         if (ctx->flags & WINBIND_SILENT) {
 665                 return PAM_SUCCESS;
 666         }
 667
 668         pmsg[0] = &msg[0];
 669         msg[0].msg = discard_const_p(char, text);
 670         msg[0].msg_style = type;
 671
 672         resp = NULL;
 673         retval = converse(ctx->pamh, 1, pmsg, &resp);
 674
 675         if (resp) {
 676                 _pam_drop_reply(resp, 1);
 677         }
 678         return retval;
 679 }
 680
 681 static int _make_remark_v(struct pwb_context *ctx,
 682                           int type,
 683                           const char *format,
 684                           va_list args)
 685 {
 686         char *var;
 687         int ret;
 688
 689         ret = vasprintf(&var, format, args);
 690         if (ret < 0) {
 691                 _pam_log(ctx, LOG_ERR, "memory allocation failure");
 692                 return ret;
 693         }
 694
 695         ret = _make_remark(ctx, type, var);
 696         SAFE_FREE(var);
 697         return ret;
 698 }
 699
 700 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 701 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
 702 {
 703         int ret;
 704         va_list args;
 705
 706         va_start(args, format);
 707         ret = _make_remark_v(ctx, type, format, args);
 708         va_end(args);
 709         return ret;
 710 }
 711
 712 static int pam_winbind_request_log(struct pwb_context *ctx,
 713                                    int retval,
 714                                    const char *user,
 715                                    const char *fn)
 716 {
 717         switch (retval) {
 718         case PAM_AUTH_ERR:
 719                 /* incorrect password */
 720                 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
 721                          "(incorrect password or invalid membership)", user);
 722                 return retval;
 723         case PAM_ACCT_EXPIRED:
 724                 /* account expired */
 725                 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
 726                          user);
 727                 return retval;
 728         case PAM_AUTHTOK_EXPIRED:
 729                 /* password expired */
 730                 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
 731                          user);
 732                 return retval;
 733         case PAM_NEW_AUTHTOK_REQD:
 734                 /* new password required */
 735                 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
 736                          "required", user);
 737                 return retval;
 738         case PAM_USER_UNKNOWN:
 739                 /* the user does not exist */
 740                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
 741                                user);
 742                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
 743                         return PAM_IGNORE;
 744                 }
 745                 return retval;
 746         case PAM_SUCCESS:
 747                 /* Otherwise, the authentication looked good */
 748                 if (strcmp(fn, "wbcLogonUser") == 0) {
 749                         _pam_log(ctx, LOG_NOTICE,
 750                                  "user '%s' granted access", user);
 751                 } else {
 752                         _pam_log(ctx, LOG_NOTICE,
 753                                  "user '%s' OK", user);
 754                 }
 755                 return retval;
 756         default:
 757                 /* we don't know anything about this return value */
 758                 _pam_log(ctx, LOG_ERR,
 759                          "internal module error (retval = %s(%d), user = '%s')",
 760                         _pam_error_code_str(retval), retval, user);
 761                 return retval;
 762         }
 763 }
 764
 765 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
 766                                        struct wbcAuthErrorInfo *e,
 767                                        wbcErr status,
 768                                        const char *username,
 769                                        const char *fn)
 770 {
 771         int ret = PAM_AUTH_ERR;
 772
 773         if (WBC_ERROR_IS_OK(status)) {
 774                 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
 775                         fn);
 776                 ret = PAM_SUCCESS;
 777                 return pam_winbind_request_log(ctx, ret, username, fn);
 778         }
 779
 780         if (e) {
 781                 if (e->pam_error != PAM_SUCCESS) {
 782                         _pam_log(ctx, LOG_ERR,
 783                                  "request %s failed: %s, "
 784                                  "PAM error: %s (%d), NTSTATUS: %s, "
 785                                  "Error message was: %s",
 786                                  fn,
 787                                  wbcErrorString(status),
 788                                  _pam_error_code_str(e->pam_error),
 789                                  e->pam_error,
 790                                  e->nt_string,
 791                                  e->display_string);
 792                         ret = e->pam_error;
 793                         return pam_winbind_request_log(ctx, ret, username, fn);
 794                 }
 795
 796                 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
 797
 798                 ret = PAM_SERVICE_ERR;
 799                 return pam_winbind_request_log(ctx, ret, username, fn);
 800         }
 801
 802         ret = wbc_error_to_pam_error(status);
 803         return pam_winbind_request_log(ctx, ret, username, fn);
 804 }
 805
 806 #if defined(HAVE_PAM_RADIO_TYPE)
 807 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 808 {
 809         struct pam_message msg, *pmsg;
 810         struct pam_response *resp = NULL;
 811         int ret;
 812         bool retval = false;
 813         pmsg = &msg;
 814         msg.msg_style = PAM_RADIO_TYPE;
 815         msg.msg = _("Do you want to change your password now?");
 816         ret = converse(ctx->pamh, 1, &pmsg, &resp);
 817         if (resp == NULL) {
 818                 if (ret == PAM_SUCCESS) {
 819                         _pam_log(ctx, LOG_CRIT, "pam_winbind: system error!\n");
 820                         return false;
 821                 }
 822         }
 823         if (ret != PAM_SUCCESS) {
 824                 return false;
 825         }
 826         _pam_log(ctx, LOG_CRIT, "Received [%s] reply from application.\n", resp->resp);
 827
 828         if ((resp->resp != NULL) && (strcasecmp(resp->resp, "yes") == 0)) {
 829                 retval = true;
 830         }
 831
 832         _pam_drop_reply(resp, 1);
 833         return retval;
 834 }
 835 #else
 836 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 837 {
 838         return false;
 839 }
 840 #endif
 841
 842 /**
 843  * send a password expiry message if required
 844  *
 845  * @param ctx PAM winbind context.
 846  * @param next_change expected (calculated) next expiry date.
 847  * @param already_expired pointer to a boolean to indicate if the password is
 848  *        already expired.
 849  *
 850  * @return boolean Returns true if message has been sent, false if not.
 851  */
 852
 853 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
 854                                               time_t next_change,
 855                                               time_t now,
 856                                               int warn_pwd_expire,
 857                                               bool *already_expired,
 858                                               bool *change_pwd)
 859 {
 860         int days = 0;
 861         struct tm tm_now, tm_next_change;
 862         bool retval = false;
 863         int ret;
 864
 865         if (already_expired) {
 866                 *already_expired = false;
 867         }
 868
 869         if (change_pwd) {
 870                 *change_pwd = false;
 871         }
 872
 873         if (next_change <= now) {
 874                 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
 875                 if (already_expired) {
 876                         *already_expired = true;
 877                 }
 878                 return true;
 879         }
 880
 881         if ((next_change < 0) ||
 882             (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
 883                 return false;
 884         }
 885
 886         if ((localtime_r(&now, &tm_now) == NULL) ||
 887             (localtime_r(&next_change, &tm_next_change) == NULL)) {
 888                 return false;
 889         }
 890
 891         days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
 892                (tm_now.tm_yday+tm_now.tm_year*365);
 893
 894         if (days == 0) {
 895                 ret = _make_remark(ctx, PAM_TEXT_INFO,
 896                                 _("Your password expires today.\n"));
 897
 898                 /*
 899                  * If change_pwd and already_expired is null.
 900                  * We are just sending a notification message.
 901                  * We don't expect any response in this case.
 902                  */
 903
 904                 if (!change_pwd && !already_expired) {
 905                         return true;
 906                 }
 907
 908                 /*
 909                  * successfully sent the warning message.
 910                  * Give the user a chance to change pwd.
 911                  */
 912                 if (ret == PAM_SUCCESS) {
 913                         if (change_pwd) {
 914                                 retval = _pam_winbind_change_pwd(ctx);
 915                                 if (retval) {
 916                                         *change_pwd = true;
 917                                 }
 918                         }
 919                 }
 920                 return true;
 921         }
 922
 923         if (days > 0 && days < warn_pwd_expire) {
 924
 925                 ret = _make_remark_format(ctx, PAM_TEXT_INFO,
 926                                         _("Your password will expire in %d %s.\n"),
 927                                         days, (days > 1) ? _("days"):_("day"));
 928                 /*
 929                  * If change_pwd and already_expired is null.
 930                  * We are just sending a notification message.
 931                  * We don't expect any response in this case.
 932                  */
 933
 934                 if (!change_pwd && !already_expired) {
 935                         return true;
 936                 }
 937
 938                 /*
 939                  * successfully sent the warning message.
 940                  * Give the user a chance to change pwd.
 941                  */
 942                 if (ret == PAM_SUCCESS) {
 943                         if (change_pwd) {
 944                                 retval = _pam_winbind_change_pwd(ctx);
 945                                 if (retval) {
 946                                         *change_pwd = true;
 947                                 }
 948                         }
 949                 }
 950                 return true;
 951         }
 952
 953         return false;
 954 }
 955
 956 /**
 957  * Send a warning if the password expires in the near future
 958  *
 959  * @param ctx PAM winbind context.
 960  * @param response The full authentication response structure.
 961  * @param already_expired boolean, is the pwd already expired?
 962  *
 963  * @return void.
 964  */
 965
 966 static void _pam_warn_password_expiry(struct pwb_context *ctx,
 967                                       const struct wbcAuthUserInfo *info,
 968                                       const struct wbcUserPasswordPolicyInfo *policy,
 969                                       int warn_pwd_expire,
 970                                       bool *already_expired,
 971                                       bool *change_pwd)
 972 {
 973         time_t now = time(NULL);
 974         time_t next_change = 0;
 975
 976         if (!info || !policy) {
 977                 return;
 978         }
 979
 980         if (already_expired) {
 981                 *already_expired = false;
 982         }
 983
 984         if (change_pwd) {
 985                 *change_pwd = false;
 986         }
 987
 988         /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
 989         if (info->acct_flags & WBC_ACB_PWNOEXP) {
 990                 return;
 991         }
 992
 993         /* no point in sending a warning if this is a grace logon */
 994         if (PAM_WB_GRACE_LOGON(info->user_flags)) {
 995                 return;
 996         }
 997
 998         /* check if the info3 must change timestamp has been set */
 999         next_change = info->pass_must_change_time;
1000
1001         if (_pam_send_password_expiry_message(ctx, next_change, now,
1002                                               warn_pwd_expire,
1003                                               already_expired,
1004                                               change_pwd)) {
1005                 return;
1006         }
1007
1008         /* now check for the global password policy */
1009         /* good catch from Ralf Haferkamp: an expiry of "never" is translated
1010          * to -1 */
1011         if ((policy->expire == (int64_t)-1) ||
1012             (policy->expire == 0)) {
1013                 return;
1014         }
1015
1016         next_change = info->pass_last_set_time + policy->expire;
1017
1018         if (_pam_send_password_expiry_message(ctx, next_change, now,
1019                                               warn_pwd_expire,
1020                                               already_expired,
1021                                               change_pwd)) {
1022                 return;
1023         }
1024
1025         /* no warning sent */
1026 }
1027
1028 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
1029
1030 /**
1031  * Append a string, making sure not to overflow and to always return a
1032  * NULL-terminated string.
1033  *
1034  * @param dest Destination string buffer (must already be NULL-terminated).
1035  * @param src Source string buffer.
1036  * @param dest_buffer_size Size of dest buffer in bytes.
1037  *
1038  * @return false if dest buffer is not big enough (no bytes copied), true on
1039  * success.
1040  */
1041
1042 static bool safe_append_string(char *dest,
1043                                const char *src,
1044                                int dest_buffer_size)
1045 {
1046         int dest_length = strlen(dest);
1047         int src_length = strlen(src);
1048
1049         if (dest_length + src_length + 1 > dest_buffer_size) {
1050                 return false;
1051         }
1052
1053         memcpy(dest + dest_length, src, src_length + 1);
1054         return true;
1055 }
1056
1057 /**
1058  * Convert a names into a SID string, appending it to a buffer.
1059  *
1060  * @param ctx PAM winbind context.
1061  * @param user User in PAM request.
1062  * @param name Name to convert.
1063  * @param sid_list_buffer Where to append the string sid.
1064  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1065  *
1066  * @return false on failure, true on success.
1067  */
1068 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
1069                                        const char *user,
1070                                        const char *name,
1071                                        char *sid_list_buffer,
1072                                        int sid_list_buffer_size)
1073 {
1074         char sid_string[WBC_SID_STRING_BUFLEN];
1075
1076         /* lookup name? */
1077         if (IS_SID_STRING(name)) {
1078                 strlcpy(sid_string, name, sizeof(sid_string));
1079         } else {
1080                 wbcErr wbc_status;
1081                 struct wbcDomainSid sid;
1082                 enum wbcSidType type;
1083
1084                 _pam_log_debug(ctx, LOG_DEBUG,
1085                                "no sid given, looking up: %s\n", name);
1086
1087                 wbc_status = wbcLookupName("", name, &sid, &type);
1088                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1089                         _pam_log(ctx, LOG_INFO,
1090                                  "could not lookup name: %s\n", name);
1091                         return false;
1092                 }
1093
1094                 wbcSidToStringBuf(&sid, sid_string, sizeof(sid_string));
1095         }
1096
1097         if (!safe_append_string(sid_list_buffer, sid_string,
1098                                 sid_list_buffer_size)) {
1099                 return false;
1100         }
1101         return true;
1102 }
1103
1104 /**
1105  * Convert a list of names into a list of sids.
1106  *
1107  * @param ctx PAM winbind context.
1108  * @param user User in PAM request.
1109  * @param name_list List of names or string sids, separated by commas.
1110  * @param sid_list_buffer Where to put the list of string sids.
1111  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1112  *
1113  * @return false on failure, true on success.
1114  */
1115 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1116                                                  const char *user,
1117                                                  const char *name_list,
1118                                                  char *sid_list_buffer,
1119                                                  int sid_list_buffer_size)
1120 {
1121         bool result = false;
1122         char *current_name = NULL;
1123         const char *search_location;
1124         const char *comma;
1125         int len;
1126
1127         if (sid_list_buffer_size > 0) {
1128                 sid_list_buffer[0] = 0;
1129         }
1130
1131         search_location = name_list;
1132         while ((comma = strchr(search_location, ',')) != NULL) {
1133                 current_name = strndup(search_location,
1134                                        comma - search_location);
1135                 if (NULL == current_name) {
1136                         goto out;
1137                 }
1138
1139                 if (!winbind_name_to_sid_string(ctx, user,
1140                                                 current_name,
1141                                                 sid_list_buffer,
1142                                                 sid_list_buffer_size)) {
1143                         /*
1144                          * If one group name failed, we must not fail
1145                          * the authentication totally, continue with
1146                          * the following group names. If user belongs to
1147                          * one of the valid groups, we must allow it
1148                          * login. -- BoYang
1149                          */
1150
1151                         _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1152                                  "check if group %s is valid group.", current_name,
1153                                  current_name);
1154                         _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1155                                         "to sid, please contact your administrator to see "
1156                                         "if group %s is valid."), current_name, current_name);
1157                         SAFE_FREE(current_name);
1158                         search_location = comma + 1;
1159                         continue;
1160                 }
1161
1162                 SAFE_FREE(current_name);
1163
1164                 if (!safe_append_string(sid_list_buffer, ",",
1165                                         sid_list_buffer_size)) {
1166                         goto out;
1167                 }
1168
1169                 search_location = comma + 1;
1170         }
1171
1172         if (!winbind_name_to_sid_string(ctx, user, search_location,
1173                                         sid_list_buffer,
1174                                         sid_list_buffer_size)) {
1175                 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1176                          "check if group %s is valid group.", search_location,
1177                          search_location);
1178                 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1179                                 "to sid, please contact your administrator to see "
1180                                 "if group %s is valid."), search_location, search_location);
1181                 /*
1182                  * The lookup of the last name failed..
1183                  * It results in require_member_of_sid ends with ','
1184                  * It is malformated parameter here, overwrite the last ','.
1185                  */
1186                 len = strlen(sid_list_buffer);
1187                 if ((len != 0) && (sid_list_buffer[len - 1] == ',')) {
1188                         sid_list_buffer[len - 1] = '\0';
1189                 }
1190         }
1191
1192         result = true;
1193
1194 out:
1195         SAFE_FREE(current_name);
1196         return result;
1197 }
1198
1199 /**
1200  * put krb5ccname variable into environment
1201  *
1202  * @param ctx PAM winbind context.
1203  * @param krb5ccname env variable retrieved from winbindd.
1204  *
1205  * @return void.
1206  */
1207
1208 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1209                                 struct wbcLogonUserInfo *info)
1210 {
1211         char *var = NULL;
1212         int ret;
1213         uint32_t i;
1214         const char *krb5ccname = NULL;
1215
1216         if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1217                 return;
1218         }
1219
1220         if (!info) {
1221                 return;
1222         }
1223
1224         for (i=0; i < info->num_blobs; i++) {
1225                 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1226                         krb5ccname = (const char *)info->blobs[i].blob.data;
1227                         break;
1228                 }
1229         }
1230
1231         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1232                 return;
1233         }
1234
1235         _pam_log_debug(ctx, LOG_DEBUG,
1236                        "request returned KRB5CCNAME: %s", krb5ccname);
1237
1238         if (asprintf(&var, "KRB5CCNAME=%s", krb5ccname) == -1) {
1239                 return;
1240         }
1241
1242         ret = pam_putenv(ctx->pamh, var);
1243         if (ret) {
1244                 _pam_log(ctx, LOG_ERR,
1245                          "failed to set KRB5CCNAME to %s: %s",
1246                          var, pam_strerror(ctx->pamh, ret));
1247         }
1248         free(var);
1249 }
1250
1251 /**
1252  * Copy unix username if available (further processed in PAM).
1253  *
1254  * @param ctx PAM winbind context
1255  * @param user_ret A pointer that holds a pointer to a string
1256  * @param unix_username A username
1257  *
1258  * @return void.
1259  */
1260
1261 static void _pam_setup_unix_username(struct pwb_context *ctx,
1262                                      char **user_ret,
1263                                      struct wbcLogonUserInfo *info)
1264 {
1265         const char *unix_username = NULL;
1266         uint32_t i;
1267
1268         if (!user_ret || !info) {
1269                 return;
1270         }
1271
1272         for (i=0; i < info->num_blobs; i++) {
1273                 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1274                         unix_username = (const char *)info->blobs[i].blob.data;
1275                         break;
1276                 }
1277         }
1278
1279         if (!unix_username || !unix_username[0]) {
1280                 return;
1281         }
1282
1283         *user_ret = strdup(unix_username);
1284 }
1285
1286 /**
1287  * Set string into the PAM stack.
1288  *
1289  * @param ctx PAM winbind context.
1290  * @param data_name Key name for pam_set_data.
1291  * @param value String value.
1292  *
1293  * @return void.
1294  */
1295
1296 static void _pam_set_data_string(struct pwb_context *ctx,
1297                                  const char *data_name,
1298                                  const char *value)
1299 {
1300         int ret;
1301
1302         if (!data_name || !value || (strlen(data_name) == 0) ||
1303              (strlen(value) == 0)) {
1304                 return;
1305         }
1306
1307         ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1308                            _pam_winbind_cleanup_func);
1309         if (ret) {
1310                 _pam_log_debug(ctx, LOG_DEBUG,
1311                                "Could not set data %s: %s\n",
1312                                data_name, pam_strerror(ctx->pamh, ret));
1313         }
1314 }
1315
1316 /**
1317  * Set info3 strings into the PAM stack.
1318  *
1319  * @param ctx PAM winbind context.
1320  * @param data_name Key name for pam_set_data.
1321  * @param value String value.
1322  *
1323  * @return void.
1324  */
1325
1326 static void _pam_set_data_info3(struct pwb_context *ctx,
1327                                 const struct wbcAuthUserInfo *info)
1328 {
1329         _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1330                              info->home_directory);
1331         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1332                              info->logon_script);
1333         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1334                              info->logon_server);
1335         _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1336                              info->profile_path);
1337 }
1338
1339 /**
1340  * Free info3 strings in the PAM stack.
1341  *
1342  * @param pamh PAM handle
1343  *
1344  * @return void.
1345  */
1346
1347 static void _pam_free_data_info3(pam_handle_t *pamh)
1348 {
1349         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1350         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1351         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1352         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1353 }
1354
1355 /**
1356  * Send PAM_ERROR_MSG for cached or grace logons.
1357  *
1358  * @param ctx PAM winbind context.
1359  * @param username User in PAM request.
1360  * @param info3_user_flgs Info3 flags containing logon type bits.
1361  *
1362  * @return void.
1363  */
1364
1365 static void _pam_warn_logon_type(struct pwb_context *ctx,
1366                                  const char *username,
1367                                  uint32_t info3_user_flgs)
1368 {
1369         /* inform about logon type */
1370         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1371
1372                 _make_remark(ctx, PAM_ERROR_MSG,
1373                              _("Grace login. "
1374                                "Please change your password as soon you're "
1375                                "online again"));
1376                 _pam_log_debug(ctx, LOG_DEBUG,
1377                                "User %s logged on using grace logon\n",
1378                                username);
1379
1380         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1381
1382                 _make_remark(ctx, PAM_ERROR_MSG,
1383                              _("Domain Controller unreachable, "
1384                                "using cached credentials instead. "
1385                                "Network resources may be unavailable"));
1386                 _pam_log_debug(ctx, LOG_DEBUG,
1387                                "User %s logged on using cached credentials\n",
1388                                username);
1389         }
1390 }
1391
1392 /**
1393  * Send PAM_ERROR_MSG for krb5 errors.
1394  *
1395  * @param ctx PAM winbind context.
1396  * @param username User in PAM request.
1397  * @param info3_user_flgs Info3 flags containing logon type bits.
1398  *
1399  * @return void.
1400  */
1401
1402 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1403                                    const char *username,
1404                                    uint32_t info3_user_flgs)
1405 {
1406         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1407                 _make_remark(ctx, PAM_ERROR_MSG,
1408                              _("Failed to establish your Kerberos Ticket cache "
1409                                "due time differences\n"
1410                                "with the domain controller.  "
1411                                "Please verify the system time.\n"));
1412                 _pam_log_debug(ctx, LOG_DEBUG,
1413                                "User %s: Clock skew when getting Krb5 TGT\n",
1414                                username);
1415         }
1416 }
1417
1418 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1419                                        const struct wbcAuthErrorInfo *e,
1420                                        const char *nt_status_string,
1421                                        int *pam_err)
1422 {
1423         const char *ntstatus = NULL;
1424         const char *error_string = NULL;
1425
1426         if (!e || !pam_err) {
1427                 return false;
1428         }
1429
1430         ntstatus = e->nt_string;
1431         if (!ntstatus) {
1432                 return false;
1433         }
1434
1435         if (strcasecmp(ntstatus, nt_status_string) == 0) {
1436
1437                 error_string = _get_ntstatus_error_string(nt_status_string);
1438                 if (error_string) {
1439                         _make_remark(ctx, PAM_ERROR_MSG, error_string);
1440                         *pam_err = e->pam_error;
1441                         return true;
1442                 }
1443
1444                 if (e->display_string) {
1445                         _make_remark(ctx, PAM_ERROR_MSG, _(e->display_string));
1446                         *pam_err = e->pam_error;
1447                         return true;
1448                 }
1449
1450                 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1451                 *pam_err = e->pam_error;
1452
1453                 return true;
1454         }
1455
1456         return false;
1457 };
1458
1459 /**
1460  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1461  *
1462  * @param i The wbcUserPasswordPolicyInfo struct.
1463  *
1464  * @return string (caller needs to talloc_free).
1465  */
1466
1467 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1468                                                  struct wbcUserPasswordPolicyInfo *i)
1469 {
1470         char *str = NULL;
1471
1472         if (!i) {
1473                 goto failed;
1474         }
1475
1476         str = talloc_asprintf(ctx, _("Your password "));
1477         if (!str) {
1478                 goto failed;
1479         }
1480
1481         if (i->min_length_password > 0) {
1482                 str = talloc_asprintf_append(str,
1483                                _("must be at least %d characters; "),
1484                                i->min_length_password);
1485                 if (!str) {
1486                         goto failed;
1487                 }
1488         }
1489
1490         if (i->password_history > 0) {
1491                 str = talloc_asprintf_append(str,
1492                                _("cannot repeat any of your previous %d "
1493                                 "passwords; "),
1494                                i->password_history);
1495                 if (!str) {
1496                         goto failed;
1497                 }
1498         }
1499
1500         if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1501                 str = talloc_asprintf_append(str,
1502                                _("must contain capitals, numerals "
1503                                  "or punctuation; "
1504                                  "and cannot contain your account "
1505                                  "or full name; "));
1506                 if (!str) {
1507                         goto failed;
1508                 }
1509         }
1510
1511         str = talloc_asprintf_append(str,
1512                        _("Please type a different password. "
1513                          "Type a password which meets these requirements in "
1514                          "both text boxes."));
1515         if (!str) {
1516                 goto failed;
1517         }
1518
1519         return str;
1520
1521  failed:
1522         TALLOC_FREE(str);
1523         return NULL;
1524 }
1525
1526 static int _pam_create_homedir(struct pwb_context *ctx,
1527                                const char *dirname,
1528                                mode_t mode)
1529 {
1530         struct stat sbuf;
1531
1532         if (stat(dirname, &sbuf) == 0) {
1533                 return PAM_SUCCESS;
1534         }
1535
1536         if (mkdir(dirname, mode) != 0) {
1537
1538                 _make_remark_format(ctx, PAM_TEXT_INFO,
1539                                     _("Creating directory: %s failed: %s"),
1540                                     dirname, strerror(errno));
1541                 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1542                  dirname, strerror(errno));
1543                  return PAM_PERM_DENIED;
1544         }
1545
1546         return PAM_SUCCESS;
1547 }
1548
1549 static int _pam_chown_homedir(struct pwb_context *ctx,
1550                               const char *dirname,
1551                               uid_t uid,
1552                               gid_t gid)
1553 {
1554         if (chown(dirname, uid, gid) != 0) {
1555                 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1556                          dirname, strerror(errno));
1557                 return PAM_PERM_DENIED;
1558         }
1559
1560         return PAM_SUCCESS;
1561 }
1562
1563 static int _pam_mkhomedir(struct pwb_context *ctx)
1564 {
1565         struct passwd *pwd = NULL;
1566         char *token = NULL;
1567         char *create_dir = NULL;
1568         char *user_dir = NULL;
1569         int ret;
1570         const char *username;
1571         mode_t mode = 0700;
1572         char *safe_ptr = NULL;
1573         char *p = NULL;
1574
1575         /* Get the username */
1576         ret = pam_get_user(ctx->pamh, &username, NULL);
1577         if ((ret != PAM_SUCCESS) || (!username)) {
1578                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1579                 return PAM_SERVICE_ERR;
1580         }
1581
1582         pwd = getpwnam(username);
1583         if (pwd == NULL) {
1584                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1585                 return PAM_USER_UNKNOWN;
1586         }
1587         _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1588
1589         ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1590         if (ret == PAM_SUCCESS) {
1591                 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1592                                          pwd->pw_uid,
1593                                          pwd->pw_gid);
1594         }
1595
1596         if (ret == PAM_SUCCESS) {
1597                 return ret;
1598         }
1599
1600         /* maybe we need to create parent dirs */
1601         create_dir = talloc_strdup(ctx, "/");
1602         if (!create_dir) {
1603                 return PAM_BUF_ERR;
1604         }
1605
1606         /* find final directory */
1607         user_dir = strrchr(pwd->pw_dir, '/');
1608         if (!user_dir) {
1609                 return PAM_BUF_ERR;
1610         }
1611         user_dir++;
1612
1613         _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1614
1615         p = pwd->pw_dir;
1616
1617         while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1618
1619                 mode = 0755;
1620
1621                 p = NULL;
1622
1623                 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1624
1625                 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1626                 if (!create_dir) {
1627                         return PAM_BUF_ERR;
1628                 }
1629                 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1630
1631                 if (strcmp(token, user_dir) == 0) {
1632                         _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1633                         mode = 0700;
1634                 }
1635
1636                 ret = _pam_create_homedir(ctx, create_dir, mode);
1637                 if (ret) {
1638                         return ret;
1639                 }
1640         }
1641
1642         return _pam_chown_homedir(ctx, create_dir,
1643                                   pwd->pw_uid,
1644                                   pwd->pw_gid);
1645 }
1646
1647 /* talk to winbindd */
1648 static int winbind_auth_request(struct pwb_context *ctx,
1649                                 const char *user,
1650                                 const char *pass,
1651                                 const char *member,
1652                                 const char *cctype,
1653                                 const int warn_pwd_expire,
1654                                 struct wbcAuthErrorInfo **p_error,
1655                                 struct wbcLogonUserInfo **p_info,
1656                                 struct wbcUserPasswordPolicyInfo **p_policy,
1657                                 time_t *pwd_last_set,
1658                                 char **user_ret)
1659 {
1660         wbcErr wbc_status;
1661
1662         struct wbcLogonUserParams logon;
1663         char membership_of[1024];
1664         uid_t user_uid = -1;
1665         uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1666                          WBFLAG_PAM_GET_PWD_POLICY;
1667
1668         struct wbcLogonUserInfo *info = NULL;
1669         struct wbcAuthUserInfo *user_info = NULL;
1670         struct wbcAuthErrorInfo *error = NULL;
1671         struct wbcUserPasswordPolicyInfo *policy = NULL;
1672
1673         int ret = PAM_AUTH_ERR;
1674         int i;
1675         const char *codes[] = {
1676                 "NT_STATUS_PASSWORD_EXPIRED",
1677                 "NT_STATUS_PASSWORD_MUST_CHANGE",
1678                 "NT_STATUS_INVALID_WORKSTATION",
1679                 "NT_STATUS_INVALID_LOGON_HOURS",
1680                 "NT_STATUS_ACCOUNT_EXPIRED",
1681                 "NT_STATUS_ACCOUNT_DISABLED",
1682                 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1683                 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1684                 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1685                 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1686                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1687                 "NT_STATUS_NO_LOGON_SERVERS",
1688                 "NT_STATUS_WRONG_PASSWORD",
1689                 "NT_STATUS_ACCESS_DENIED"
1690         };
1691
1692         if (pwd_last_set) {
1693                 *pwd_last_set = 0;
1694         }
1695
1696         /* Krb5 auth always has to go against the KDC of the user's realm */
1697
1698         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1699                 flags           |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1700         }
1701
1702         if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1703                 struct passwd *pwd = NULL;
1704
1705                 pwd = getpwnam(user);
1706                 if (pwd == NULL) {
1707                         return PAM_USER_UNKNOWN;
1708                 }
1709                 user_uid        = pwd->pw_uid;
1710         }
1711
1712         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1713
1714                 _pam_log_debug(ctx, LOG_DEBUG,
1715                                "enabling krb5 login flag\n");
1716
1717                 flags           |= WBFLAG_PAM_KRB5 |
1718                                    WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1719         }
1720
1721         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1722                 _pam_log_debug(ctx, LOG_DEBUG,
1723                                "enabling cached login flag\n");
1724                 flags           |= WBFLAG_PAM_CACHED_LOGIN;
1725         }
1726
1727         if (user_ret) {
1728                 *user_ret = NULL;
1729                 flags           |= WBFLAG_PAM_UNIX_NAME;
1730         }
1731
1732         if (cctype != NULL) {
1733                 _pam_log_debug(ctx, LOG_DEBUG,
1734                                "enabling request for a %s krb5 ccache\n",
1735                                cctype);
1736         }
1737
1738         if (member != NULL) {
1739
1740                 ZERO_STRUCT(membership_of);
1741
1742                 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1743                                                           membership_of,
1744                                                           sizeof(membership_of))) {
1745                         _pam_log_debug(ctx, LOG_ERR,
1746                                        "failed to serialize membership of sid "
1747                                        "\"%s\"\n", member);
1748                         return PAM_AUTH_ERR;
1749                 }
1750         }
1751
1752         ZERO_STRUCT(logon);
1753
1754         logon.username                  = user;
1755         logon.password                  = pass;
1756
1757         if (cctype) {
1758                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1759                                              &logon.blobs,
1760                                              "krb5_cc_type",
1761                                              0,
1762                                              discard_const_p(uint8_t, cctype),
1763                                              strlen(cctype)+1);
1764                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1765                         goto done;
1766                 }
1767         }
1768
1769         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1770                                      &logon.blobs,
1771                                      "flags",
1772                                      0,
1773                                      (uint8_t *)&flags,
1774                                      sizeof(flags));
1775         if (!WBC_ERROR_IS_OK(wbc_status)) {
1776                 goto done;
1777         }
1778
1779         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1780                                      &logon.blobs,
1781                                      "user_uid",
1782                                      0,
1783                                      (uint8_t *)&user_uid,
1784                                      sizeof(user_uid));
1785         if (!WBC_ERROR_IS_OK(wbc_status)) {
1786                 goto done;
1787         }
1788
1789         if (member) {
1790                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1791                                              &logon.blobs,
1792                                              "membership_of",
1793                                              0,
1794                                              (uint8_t *)membership_of,
1795                                              sizeof(membership_of));
1796                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1797                         goto done;
1798                 }
1799         }
1800
1801         wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1802         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1803                                           user, "wbcLogonUser");
1804         wbcFreeMemory(logon.blobs);
1805         logon.blobs = NULL;
1806
1807         if (info && info->info) {
1808                 user_info = info->info;
1809         }
1810
1811         if (pwd_last_set && user_info) {
1812                 *pwd_last_set = user_info->pass_last_set_time;
1813         }
1814
1815         if (p_info && info) {
1816                 *p_info = info;
1817         }
1818
1819         if (p_policy && policy) {
1820                 *p_policy = policy;
1821         }
1822
1823         if (p_error && error) {
1824                 /* We want to process the error in the caller. */
1825                 *p_error = error;
1826                 return ret;
1827         }
1828
1829         for (i=0; i<ARRAY_SIZE(codes); i++) {
1830                 int _ret = ret;
1831                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1832                         ret = _ret;
1833                         goto done;
1834                 }
1835         }
1836
1837         if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1838
1839                 bool already_expired = false;
1840                 bool change_pwd = false;
1841
1842                 /* warn a user if the password is about to expire soon */
1843                 _pam_warn_password_expiry(ctx, user_info, policy,
1844                                           warn_pwd_expire,
1845                                           &already_expired,
1846                                           &change_pwd);
1847
1848                 if (already_expired == true) {
1849
1850                         SMB_TIME_T last_set = user_info->pass_last_set_time;
1851
1852                         _pam_log_debug(ctx, LOG_DEBUG,
1853                                        "Password has expired "
1854                                        "(Password was last set: %lld, "
1855                                        "the policy says it should expire here "
1856                                        "%lld (now it's: %ld))\n",
1857                                        (long long int)last_set,
1858                                        (long long int)last_set +
1859                                        policy->expire,
1860                                        (long)time(NULL));
1861
1862                         return PAM_AUTHTOK_EXPIRED;
1863                 }
1864
1865                 if (change_pwd) {
1866                         ret = PAM_NEW_AUTHTOK_REQD;
1867                         goto done;
1868                 }
1869
1870                 /* inform about logon type */
1871                 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1872
1873                 /* inform about krb5 failures */
1874                 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1875
1876                 /* set some info3 info for other modules in the stack */
1877                 _pam_set_data_info3(ctx, user_info);
1878
1879                 /* put krb5ccname into env */
1880                 _pam_setup_krb5_env(ctx, info);
1881
1882                 /* If winbindd returned a username, return the pointer to it
1883                  * here. */
1884                 _pam_setup_unix_username(ctx, user_ret, info);
1885         }
1886
1887  done:
1888         wbcFreeMemory(logon.blobs);
1889         if (info && info->blobs && !p_info) {
1890                 wbcFreeMemory(info->blobs);
1891         }
1892         if (error && !p_error) {
1893                 wbcFreeMemory(error);
1894         }
1895         if (info && !p_info) {
1896                 wbcFreeMemory(info);
1897         }
1898         if (policy && !p_policy) {
1899                 wbcFreeMemory(policy);
1900         }
1901
1902         return ret;
1903 }
1904
1905 /* talk to winbindd */
1906 static int winbind_chauthtok_request(struct pwb_context *ctx,
1907                                      const char *user,
1908                                      const char *oldpass,
1909                                      const char *newpass,
1910                                      time_t pwd_last_set)
1911 {
1912         wbcErr wbc_status;
1913         struct wbcChangePasswordParams params;
1914         struct wbcAuthErrorInfo *error = NULL;
1915         struct wbcUserPasswordPolicyInfo *policy = NULL;
1916         enum wbcPasswordChangeRejectReason reject_reason = -1;
1917         uint32_t flags = 0;
1918
1919         int i;
1920         const char *codes[] = {
1921                 "NT_STATUS_BACKUP_CONTROLLER",
1922                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1923                 "NT_STATUS_NO_LOGON_SERVERS",
1924                 "NT_STATUS_ACCESS_DENIED",
1925                 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1926                 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1927                 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1928         };
1929         int ret = PAM_AUTH_ERR;
1930
1931         ZERO_STRUCT(params);
1932
1933         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1934                 flags |= WBFLAG_PAM_KRB5 |
1935                          WBFLAG_PAM_CONTACT_TRUSTDOM;
1936         }
1937
1938         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1939                 flags |= WBFLAG_PAM_CACHED_LOGIN;
1940         }
1941
1942         params.account_name             = user;
1943         params.level                    = WBC_CHANGE_PASSWORD_LEVEL_PLAIN;
1944         params.old_password.plaintext   = oldpass;
1945         params.new_password.plaintext   = newpass;
1946         params.flags                    = flags;
1947
1948         wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1949         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1950                                           user, "wbcChangeUserPasswordEx");
1951
1952         if (WBC_ERROR_IS_OK(wbc_status)) {
1953                 _pam_log(ctx, LOG_NOTICE,
1954                          "user '%s' password changed", user);
1955                 return PAM_SUCCESS;
1956         }
1957
1958         if (!error) {
1959                 wbcFreeMemory(policy);
1960                 return ret;
1961         }
1962
1963         for (i=0; i<ARRAY_SIZE(codes); i++) {
1964                 int _ret = ret;
1965                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1966                         ret = _ret;
1967                         goto done;
1968                 }
1969         }
1970
1971         if (!strcasecmp(error->nt_string,
1972                         "NT_STATUS_PASSWORD_RESTRICTION")) {
1973
1974                 char *pwd_restriction_string = NULL;
1975                 SMB_TIME_T min_pwd_age = 0;
1976
1977                 if (policy) {
1978                         min_pwd_age     = policy->min_passwordage;
1979                 }
1980
1981                 /* FIXME: avoid to send multiple PAM messages after another */
1982                 switch (reject_reason) {
1983                         case -1:
1984                                 break;
1985                         case WBC_PWD_CHANGE_NO_ERROR:
1986                                 if ((min_pwd_age > 0) &&
1987                                     (pwd_last_set + min_pwd_age > time(NULL))) {
1988                                         PAM_WB_REMARK_DIRECT(ctx,
1989                                              "NT_STATUS_PWD_TOO_RECENT");
1990                                 }
1991                                 break;
1992                         case WBC_PWD_CHANGE_PASSWORD_TOO_SHORT:
1993                                 PAM_WB_REMARK_DIRECT(ctx,
1994                                         "NT_STATUS_PWD_TOO_SHORT");
1995                                 break;
1996                         case WBC_PWD_CHANGE_PWD_IN_HISTORY:
1997                                 PAM_WB_REMARK_DIRECT(ctx,
1998                                         "NT_STATUS_PWD_HISTORY_CONFLICT");
1999                                 break;
2000                         case WBC_PWD_CHANGE_NOT_COMPLEX:
2001                                 _make_remark(ctx, PAM_ERROR_MSG,
2002                                              _("Password does not meet "
2003                                                "complexity requirements"));
2004                                 break;
2005                         default:
2006                                 _pam_log_debug(ctx, LOG_DEBUG,
2007                                                "unknown password change "
2008                                                "reject reason: %d",
2009                                                reject_reason);
2010                                 break;
2011                 }
2012
2013                 pwd_restriction_string =
2014                         _pam_compose_pwd_restriction_string(ctx, policy);
2015                 if (pwd_restriction_string) {
2016                         _make_remark(ctx, PAM_ERROR_MSG,
2017                                      pwd_restriction_string);
2018                         TALLOC_FREE(pwd_restriction_string);
2019                 }
2020         }
2021  done:
2022         wbcFreeMemory(error);
2023         wbcFreeMemory(policy);
2024
2025         return ret;
2026 }
2027
2028 /*
2029  * Checks if a user has an account
2030  *
2031  * return values:
2032  *       1  = User not found
2033  *       0  = OK
2034  *      -1  = System error
2035  */
2036 static int valid_user(struct pwb_context *ctx,
2037                       const char *user)
2038 {
2039         /* check not only if the user is available over NSS calls, also make
2040          * sure it's really a winbind user, this is important when stacking PAM
2041          * modules in the 'account' or 'password' facility. */
2042
2043         wbcErr wbc_status;
2044         struct passwd *pwd = NULL;
2045         struct passwd *wb_pwd = NULL;
2046
2047         pwd = getpwnam(user);
2048         if (pwd == NULL) {
2049                 return 1;
2050         }
2051
2052         wbc_status = wbcGetpwnam(user, &wb_pwd);
2053         wbcFreeMemory(wb_pwd);
2054         if (!WBC_ERROR_IS_OK(wbc_status)) {
2055                 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
2056                         wbcErrorString(wbc_status));
2057         }
2058
2059         switch (wbc_status) {
2060                 case WBC_ERR_UNKNOWN_USER:
2061                 /* match other insane libwbclient return codes */
2062                 case WBC_ERR_WINBIND_NOT_AVAILABLE:
2063                 case WBC_ERR_DOMAIN_NOT_FOUND:
2064                         return 1;
2065                 case WBC_ERR_SUCCESS:
2066                         return 0;
2067                 default:
2068                         break;
2069         }
2070         return -1;
2071 }
2072
2073 static char *_pam_delete(register char *xx)
2074 {
2075         _pam_overwrite(xx);
2076         _pam_drop(xx);
2077         return NULL;
2078 }
2079
2080 /*
2081  * obtain a password from the user
2082  */
2083
2084 static int _winbind_read_password(struct pwb_context *ctx,
2085                                   unsigned int ctrl,
2086                                   const char *comment,
2087                                   const char *prompt1,
2088                                   const char *prompt2,
2089                                   const char **pass)
2090 {
2091         int authtok_flag;
2092         int retval;
2093         const char *item;
2094         char *token;
2095
2096         _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2097
2098         /*
2099          * make sure nothing inappropriate gets returned
2100          */
2101
2102         *pass = token = NULL;
2103
2104         /*
2105          * which authentication token are we getting?
2106          */
2107
2108         if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2109                 authtok_flag = PAM_OLDAUTHTOK;
2110         } else {
2111                 authtok_flag = PAM_AUTHTOK;
2112         }
2113
2114         /*
2115          * should we obtain the password from a PAM item ?
2116          */
2117
2118         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2119             on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2120                 retval = pam_get_item(ctx->pamh,
2121                                       authtok_flag,
2122                                       (const void **) &item);
2123                 if (retval != PAM_SUCCESS) {
2124                         /* very strange. */
2125                         _pam_log(ctx, LOG_ALERT,
2126                                  "pam_get_item returned error "
2127                                  "to unix-read-password");
2128                         return retval;
2129                 } else if (item != NULL) {      /* we have a password! */
2130                         *pass = item;
2131                         item = NULL;
2132                         _pam_log(ctx, LOG_DEBUG,
2133                                  "pam_get_item returned a password");
2134                         return PAM_SUCCESS;
2135                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2136                         return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2137                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2138                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
2139                         return PAM_AUTHTOK_RECOVER_ERR;
2140                 }
2141         }
2142         /*
2143          * getting here implies we will have to get the password from the
2144          * user directly.
2145          */
2146
2147         {
2148                 struct pam_message msg[3], *pmsg[3];
2149                 struct pam_response *resp;
2150                 int i, replies;
2151
2152                 /* prepare to converse */
2153
2154                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2155                         pmsg[0] = &msg[0];
2156                         msg[0].msg_style = PAM_TEXT_INFO;
2157                         msg[0].msg = discard_const_p(char, comment);
2158                         i = 1;
2159                 } else {
2160                         i = 0;
2161                 }
2162
2163                 pmsg[i] = &msg[i];
2164                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2165                 msg[i++].msg = discard_const_p(char, prompt1);
2166                 replies = 1;
2167
2168                 if (prompt2 != NULL) {
2169                         pmsg[i] = &msg[i];
2170                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2171                         msg[i++].msg = discard_const_p(char, prompt2);
2172                         ++replies;
2173                 }
2174                 /* so call the conversation expecting i responses */
2175                 resp = NULL;
2176                 retval = converse(ctx->pamh, i, pmsg, &resp);
2177                 if (resp == NULL) {
2178                         if (retval == PAM_SUCCESS) {
2179                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2180                         }
2181                         goto done;
2182                 }
2183                 if (retval != PAM_SUCCESS) {
2184                         _pam_drop_reply(resp, i);
2185                         goto done;
2186                 }
2187
2188                 /* interpret the response */
2189
2190                 token = x_strdup(resp[i - replies].resp);
2191                 if (!token) {
2192                         _pam_log(ctx, LOG_NOTICE,
2193                                  "could not recover "
2194                                  "authentication token");
2195                         retval = PAM_AUTHTOK_RECOVER_ERR;
2196                         goto done;
2197                 }
2198
2199                 if (replies == 2) {
2200                         /* verify that password entered correctly */
2201                         if (!resp[i - 1].resp ||
2202                             strcmp(token, resp[i - 1].resp)) {
2203                                 _pam_delete(token);     /* mistyped */
2204                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2205                                 _make_remark(ctx, PAM_ERROR_MSG,
2206                                              MISTYPED_PASS);
2207                         }
2208                 }
2209
2210                 /*
2211                  * tidy up the conversation (resp_retcode) is ignored
2212                  * -- what is it for anyway? AGM
2213                  */
2214                 _pam_drop_reply(resp, i);
2215         }
2216
2217  done:
2218         if (retval != PAM_SUCCESS) {
2219                 _pam_log_debug(ctx, LOG_DEBUG,
2220                                "unable to obtain a password");
2221                 return retval;
2222         }
2223         /* 'token' is the entered password */
2224
2225         /* we store this password as an item */
2226
2227         retval = pam_set_item(ctx->pamh, authtok_flag, token);
2228         _pam_delete(token);     /* clean it up */
2229         if (retval != PAM_SUCCESS ||
2230             (retval = pam_get_item(ctx->pamh, authtok_flag, (const void **) &item)) != PAM_SUCCESS) {
2231
2232                 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2233                 return retval;
2234
2235         }
2236
2237         *pass = item;
2238         item = NULL;            /* break link to password */
2239
2240         return PAM_SUCCESS;
2241 }
2242
2243 static const char *get_conf_item_string(struct pwb_context *ctx,
2244                                         const char *item,
2245                                         int config_flag)
2246 {
2247         int i = 0;
2248         const char *parm_opt = NULL;
2249
2250         if (!(ctx->ctrl & config_flag)) {
2251                 goto out;
2252         }
2253
2254         /* let the pam opt take precedence over the pam_winbind.conf option */
2255         for (i=0; i<ctx->argc; i++) {
2256
2257                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2258                         char *p;
2259
2260                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2261                                 _pam_log(ctx, LOG_INFO,
2262                                          "no \"=\" delimiter for \"%s\" found\n",
2263                                          item);
2264                                 goto out;
2265                         }
2266                         _pam_log_debug(ctx, LOG_INFO,
2267                                        "PAM config: %s '%s'\n", item, p+1);
2268                         return p + 1;
2269                 }
2270         }
2271
2272         if (ctx->dict) {
2273                 char *key = NULL;
2274
2275                 key = talloc_asprintf(ctx, "global:%s", item);
2276                 if (!key) {
2277                         goto out;
2278                 }
2279
2280                 parm_opt = iniparser_getstring_nonempty(ctx->dict, key, NULL);
2281                 TALLOC_FREE(key);
2282
2283                 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2284                                item, parm_opt);
2285         }
2286 out:
2287         return parm_opt;
2288 }
2289
2290 static int get_config_item_int(struct pwb_context *ctx,
2291                                const char *item,
2292                                int config_flag)
2293 {
2294         int i, parm_opt = -1;
2295
2296         if (!(ctx->ctrl & config_flag)) {
2297                 goto out;
2298         }
2299
2300         /* let the pam opt take precedence over the pam_winbind.conf option */
2301         for (i = 0; i < ctx->argc; i++) {
2302
2303                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2304                         char *p;
2305
2306                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2307                                 _pam_log(ctx, LOG_INFO,
2308                                          "no \"=\" delimiter for \"%s\" found\n",
2309                                          item);
2310                                 goto out;
2311                         }
2312                         parm_opt = atoi(p + 1);
2313                         _pam_log_debug(ctx, LOG_INFO,
2314                                        "PAM config: %s '%d'\n",
2315                                        item, parm_opt);
2316                         return parm_opt;
2317                 }
2318         }
2319
2320         if (ctx->dict) {
2321                 char *key = NULL;
2322
2323                 key = talloc_asprintf(ctx, "global:%s", item);
2324                 if (!key) {
2325                         goto out;
2326                 }
2327
2328                 parm_opt = iniparser_getint(ctx->dict, key, -1);
2329                 TALLOC_FREE(key);
2330
2331                 _pam_log_debug(ctx, LOG_INFO,
2332                                "CONFIG file: %s '%d'\n",
2333                                item, parm_opt);
2334         }
2335 out:
2336         return parm_opt;
2337 }
2338
2339 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2340 {
2341         return get_conf_item_string(ctx, "krb5_ccache_type",
2342                                     WINBIND_KRB5_CCACHE_TYPE);
2343 }
2344
2345 static const char *get_member_from_config(struct pwb_context *ctx)
2346 {
2347         const char *ret = NULL;
2348         ret = get_conf_item_string(ctx, "require_membership_of",
2349                                    WINBIND_REQUIRED_MEMBERSHIP);
2350         if (ret) {
2351                 return ret;
2352         }
2353         return get_conf_item_string(ctx, "require-membership-of",
2354                                     WINBIND_REQUIRED_MEMBERSHIP);
2355 }
2356
2357 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2358 {
2359         int ret;
2360         ret = get_config_item_int(ctx, "warn_pwd_expire",
2361                                   WINBIND_WARN_PWD_EXPIRE);
2362         /* no or broken setting */
2363         if (ret <= 0) {
2364                 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2365         }
2366         return ret;
2367 }
2368
2369 /**
2370  * Retrieve the winbind separator.
2371  *
2372  * @param ctx PAM winbind context.
2373  *
2374  * @return string separator character. NULL on failure.
2375  */
2376
2377 static char winbind_get_separator(struct pwb_context *ctx)
2378 {
2379         wbcErr wbc_status;
2380         static struct wbcInterfaceDetails *details = NULL;
2381
2382         wbc_status = wbcInterfaceDetails(&details);
2383         if (!WBC_ERROR_IS_OK(wbc_status)) {
2384                 _pam_log(ctx, LOG_ERR,
2385                          "Could not retrieve winbind interface details: %s",
2386                          wbcErrorString(wbc_status));
2387                 return '\0';
2388         }
2389
2390         if (!details) {
2391                 return '\0';
2392         }
2393
2394         return details->winbind_separator;
2395 }
2396
2397
2398 /**
2399  * Convert a upn to a name.
2400  *
2401  * @param ctx PAM winbind context.
2402  * @param upn  USer UPN to be trabslated.
2403  *
2404  * @return converted name. NULL pointer on failure. Caller needs to free.
2405  */
2406
2407 static char* winbind_upn_to_username(struct pwb_context *ctx,
2408                                      const char *upn)
2409 {
2410         char sep;
2411         wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2412         struct wbcDomainSid sid;
2413         enum wbcSidType type;
2414         char *domain = NULL;
2415         char *name;
2416         char *p;
2417
2418         /* This cannot work when the winbind separator = @ */
2419
2420         sep = winbind_get_separator(ctx);
2421         if (!sep || sep == '@') {
2422                 return NULL;
2423         }
2424
2425         name = talloc_strdup(ctx, upn);
2426         if (!name) {
2427                 return NULL;
2428         }
2429         if ((p = strchr(name, '@')) != NULL) {
2430                 *p = 0;
2431                 domain = p + 1;
2432         }
2433
2434         /* Convert the UPN to a SID */
2435
2436         wbc_status = wbcLookupName(domain, name, &sid, &type);
2437         if (!WBC_ERROR_IS_OK(wbc_status)) {
2438                 return NULL;
2439         }
2440
2441         /* Convert the the SID back to the sAMAccountName */
2442
2443         wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2444         if (!WBC_ERROR_IS_OK(wbc_status)) {
2445                 return NULL;
2446         }
2447
2448         return talloc_asprintf(ctx, "%s%c%s", domain, sep, name);
2449 }
2450
2451 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2452                          int argc, const char **argv)
2453 {
2454         int retval = PAM_SUCCESS;
2455         struct pwb_context *ctx = NULL;
2456         struct wbcLogoffUserParams logoff;
2457         struct wbcAuthErrorInfo *error = NULL;
2458         const char *user;
2459         wbcErr wbc_status = WBC_ERR_SUCCESS;
2460
2461         ZERO_STRUCT(logoff);
2462
2463         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2464         if (retval) {
2465                 goto out;
2466         }
2467
2468         _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2469
2470         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2471
2472                 /* destroy the ccache here */
2473
2474                 uint32_t wbc_flags = 0;
2475                 const char *ccname = NULL;
2476                 struct passwd *pwd = NULL;
2477
2478                 retval = pam_get_user(pamh, &user, _("Username: "));
2479                 if (retval) {
2480                         _pam_log(ctx, LOG_ERR,
2481                                  "could not identify user");
2482                         goto out;
2483                 }
2484
2485                 if (user == NULL) {
2486                         _pam_log(ctx, LOG_ERR,
2487                                  "username was NULL!");
2488                         retval = PAM_USER_UNKNOWN;
2489                         goto out;
2490                 }
2491
2492                 _pam_log_debug(ctx, LOG_DEBUG,
2493                                "username [%s] obtained", user);
2494
2495                 ccname = pam_getenv(pamh, "KRB5CCNAME");
2496                 if (ccname == NULL) {
2497                         _pam_log_debug(ctx, LOG_DEBUG,
2498                                        "user has no KRB5CCNAME environment");
2499                 }
2500
2501                 pwd = getpwnam(user);
2502                 if (pwd == NULL) {
2503                         retval = PAM_USER_UNKNOWN;
2504                         goto out;
2505                 }
2506
2507                 wbc_flags = WBFLAG_PAM_KRB5 |
2508                         WBFLAG_PAM_CONTACT_TRUSTDOM;
2509
2510                 logoff.username         = user;
2511
2512                 if (ccname) {
2513                         wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2514                                                      &logoff.blobs,
2515                                                      "ccfilename",
2516                                                      0,
2517                                                      discard_const_p(uint8_t, ccname),
2518                                                      strlen(ccname)+1);
2519                         if (!WBC_ERROR_IS_OK(wbc_status)) {
2520                                 goto out;
2521                         }
2522                 }
2523
2524                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2525                                              &logoff.blobs,
2526                                              "flags",
2527                                              0,
2528                                              (uint8_t *)&wbc_flags,
2529                                              sizeof(wbc_flags));
2530                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2531                         goto out;
2532                 }
2533
2534                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2535                                              &logoff.blobs,
2536                                              "user_uid",
2537                                              0,
2538                                              (uint8_t *)&pwd->pw_uid,
2539                                              sizeof(pwd->pw_uid));
2540                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2541                         goto out;
2542                 }
2543
2544                 wbc_status = wbcLogoffUserEx(&logoff, &error);
2545                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2546                                                      user, "wbcLogoffUser");
2547                 wbcFreeMemory(error);
2548                 wbcFreeMemory(logoff.blobs);
2549                 logoff.blobs = NULL;
2550
2551                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2552                         _pam_log(ctx, LOG_INFO,
2553                                  "failed to logoff user %s: %s\n",
2554                                          user, wbcErrorString(wbc_status));
2555                 }
2556         }
2557
2558 out:
2559         if (logoff.blobs) {
2560                 wbcFreeMemory(logoff.blobs);
2561         }
2562
2563         if (!WBC_ERROR_IS_OK(wbc_status)) {
2564                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2565                      user, "wbcLogoffUser");
2566         }
2567
2568         /*
2569          * Delete the krb5 ccname variable from the PAM environment
2570          * if it was set by winbind.
2571          */
2572         if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2573                 pam_putenv(pamh, "KRB5CCNAME");
2574         }
2575
2576         _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2577
2578         TALLOC_FREE(ctx);
2579
2580         return retval;
2581 }
2582
2583 PAM_EXTERN
2584 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2585                         int argc, const char **argv)
2586 {
2587         const char *username;
2588         const char *password;
2589         const char *member = NULL;
2590         const char *cctype = NULL;
2591         int warn_pwd_expire;
2592         int retval = PAM_AUTH_ERR;
2593         char *username_ret = NULL;
2594         char *new_authtok_required = NULL;
2595         char *real_username = NULL;
2596         struct pwb_context *ctx = NULL;
2597
2598         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2599         if (retval) {
2600                 goto out;
2601         }
2602
2603         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2604
2605         /* Get the username */
2606         retval = pam_get_user(pamh, &username, NULL);
2607         if ((retval != PAM_SUCCESS) || (!username)) {
2608                 _pam_log_debug(ctx, LOG_DEBUG,
2609                                "can not get the username");
2610                 retval = PAM_SERVICE_ERR;
2611                 goto out;
2612         }
2613
2614
2615 #if defined(AIX)
2616         /* Decode the user name since AIX does not support logn user
2617            names by default.  The name is encoded as _#uid.  */
2618
2619         if (username[0] == '_') {
2620                 uid_t id = atoi(&username[1]);
2621                 struct passwd *pw = NULL;
2622
2623                 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2624                         real_username = strdup(pw->pw_name);
2625                 }
2626         }
2627 #endif
2628
2629         if (!real_username) {
2630                 /* Just making a copy of the username we got from PAM */
2631                 if ((real_username = strdup(username)) == NULL) {
2632                         _pam_log_debug(ctx, LOG_DEBUG,
2633                                        "memory allocation failure when copying "
2634                                        "username");
2635                         retval = PAM_SERVICE_ERR;
2636                         goto out;
2637                 }
2638         }
2639
2640         /* Maybe this was a UPN */
2641
2642         if (strchr(real_username, '@') != NULL) {
2643                 char *samaccountname = NULL;
2644
2645                 samaccountname = winbind_upn_to_username(ctx,
2646                                                          real_username);
2647                 if (samaccountname) {
2648                         free(real_username);
2649                         real_username = strdup(samaccountname);
2650                 }
2651         }
2652
2653         retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2654                                         _("Password: "), NULL,
2655                                         &password);
2656
2657         if (retval != PAM_SUCCESS) {
2658                 _pam_log(ctx, LOG_ERR,
2659                          "Could not retrieve user's password");
2660                 retval = PAM_AUTHTOK_ERR;
2661                 goto out;
2662         }
2663
2664         /* Let's not give too much away in the log file */
2665
2666 #ifdef DEBUG_PASSWORD
2667         _pam_log_debug(ctx, LOG_INFO,
2668                        "Verify user '%s' with password '%s'",
2669                        real_username, password);
2670 #else
2671         _pam_log_debug(ctx, LOG_INFO,
2672                        "Verify user '%s'", real_username);
2673 #endif
2674
2675         member = get_member_from_config(ctx);
2676         cctype = get_krb5_cc_type_from_config(ctx);
2677         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2678
2679         /* Now use the username to look up password */
2680         retval = winbind_auth_request(ctx, real_username, password,
2681                                       member, cctype, warn_pwd_expire,
2682                                       NULL, NULL, NULL,
2683                                       NULL, &username_ret);
2684
2685         if (retval == PAM_NEW_AUTHTOK_REQD ||
2686             retval == PAM_AUTHTOK_EXPIRED) {
2687
2688                 char *new_authtok_required_during_auth = NULL;
2689
2690                 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2691                 if (!new_authtok_required) {
2692                         retval = PAM_BUF_ERR;
2693                         goto out;
2694                 }
2695
2696                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2697                              new_authtok_required,
2698                              _pam_winbind_cleanup_func);
2699
2700                 retval = PAM_SUCCESS;
2701
2702                 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2703                 if (!new_authtok_required_during_auth) {
2704                         retval = PAM_BUF_ERR;
2705                         goto out;
2706                 }
2707
2708                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2709                              new_authtok_required_during_auth,
2710                              _pam_winbind_cleanup_func);
2711
2712                 goto out;
2713         }
2714
2715 out:
2716         if (username_ret) {
2717                 pam_set_item (pamh, PAM_USER, username_ret);
2718                 _pam_log_debug(ctx, LOG_INFO,
2719                                "Returned user was '%s'", username_ret);
2720                 free(username_ret);
2721         }
2722
2723         if (real_username) {
2724                 free(real_username);
2725         }
2726
2727         if (!new_authtok_required) {
2728                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2729         }
2730
2731         if (retval != PAM_SUCCESS) {
2732                 _pam_free_data_info3(pamh);
2733         }
2734
2735         if (ctx != NULL) {
2736                 _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2737                 TALLOC_FREE(ctx);
2738         }
2739
2740         return retval;
2741 }
2742
2743 PAM_EXTERN
2744 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2745                    int argc, const char **argv)
2746 {
2747         int ret = PAM_SYSTEM_ERR;
2748         struct pwb_context *ctx = NULL;
2749
2750         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2751         if (ret) {
2752                 goto out;
2753         }
2754
2755         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2756
2757         switch (flags & ~PAM_SILENT) {
2758
2759                 case PAM_DELETE_CRED:
2760                         ret = _pam_delete_cred(pamh, flags, argc, argv);
2761                         break;
2762                 case PAM_REFRESH_CRED:
2763                         _pam_log_debug(ctx, LOG_WARNING,
2764                                        "PAM_REFRESH_CRED not implemented");
2765                         ret = PAM_SUCCESS;
2766                         break;
2767                 case PAM_REINITIALIZE_CRED:
2768                         _pam_log_debug(ctx, LOG_WARNING,
2769                                        "PAM_REINITIALIZE_CRED not implemented");
2770                         ret = PAM_SUCCESS;
2771                         break;
2772                 case PAM_ESTABLISH_CRED:
2773                         _pam_log_debug(ctx, LOG_WARNING,
2774                                        "PAM_ESTABLISH_CRED not implemented");
2775                         ret = PAM_SUCCESS;
2776                         break;
2777                 default:
2778                         ret = PAM_SYSTEM_ERR;
2779                         break;
2780         }
2781
2782  out:
2783
2784         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2785
2786         TALLOC_FREE(ctx);
2787
2788         return ret;
2789 }
2790
2791 /*
2792  * Account management. We want to verify that the account exists
2793  * before returning PAM_SUCCESS
2794  */
2795 PAM_EXTERN
2796 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2797                    int argc, const char **argv)
2798 {
2799         const char *username;
2800         int ret = PAM_USER_UNKNOWN;
2801         const char *tmp = NULL;
2802         struct pwb_context *ctx = NULL;
2803
2804         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2805         if (ret) {
2806                 goto out;
2807         }
2808
2809         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2810
2811
2812         /* Get the username */
2813         ret = pam_get_user(pamh, &username, NULL);
2814         if ((ret != PAM_SUCCESS) || (!username)) {
2815                 _pam_log_debug(ctx, LOG_DEBUG,
2816                                "can not get the username");
2817                 ret = PAM_SERVICE_ERR;
2818                 goto out;
2819         }
2820
2821         /* Verify the username */
2822         ret = valid_user(ctx, username);
2823         switch (ret) {
2824         case -1:
2825                 /* some sort of system error. The log was already printed */
2826                 ret = PAM_SERVICE_ERR;
2827                 goto out;
2828         case 1:
2829                 /* the user does not exist */
2830                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2831                                username);
2832                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2833                         ret = PAM_IGNORE;
2834                         goto out;
2835                 }
2836                 ret = PAM_USER_UNKNOWN;
2837                 goto out;
2838         case 0:
2839                 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2840                              (const void **)&tmp);
2841                 if (tmp != NULL) {
2842                         ret = atoi(tmp);
2843                         switch (ret) {
2844                         case PAM_AUTHTOK_EXPIRED:
2845                                 /* fall through, since new token is required in this case */
2846                         case PAM_NEW_AUTHTOK_REQD:
2847                                 _pam_log(ctx, LOG_WARNING,
2848                                          "pam_sm_acct_mgmt success but %s is set",
2849                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
2850                                 _pam_log(ctx, LOG_NOTICE,
2851                                          "user '%s' needs new password",
2852                                          username);
2853                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2854                                 ret = PAM_NEW_AUTHTOK_REQD;
2855                                 goto out;
2856                         default:
2857                                 _pam_log(ctx, LOG_WARNING,
2858                                          "pam_sm_acct_mgmt success");
2859                                 _pam_log(ctx, LOG_NOTICE,
2860                                          "user '%s' granted access", username);
2861                                 ret = PAM_SUCCESS;
2862                                 goto out;
2863                         }
2864                 }
2865
2866                 /* Otherwise, the authentication looked good */
2867                 _pam_log(ctx, LOG_NOTICE,
2868                          "user '%s' granted access", username);
2869                 ret = PAM_SUCCESS;
2870                 goto out;
2871         default:
2872                 /* we don't know anything about this return value */
2873                 _pam_log(ctx, LOG_ERR,
2874                          "internal module error (ret = %d, user = '%s')",
2875                          ret, username);
2876                 ret = PAM_SERVICE_ERR;
2877                 goto out;
2878         }
2879
2880         /* should not be reached */
2881         ret = PAM_IGNORE;
2882
2883  out:
2884
2885         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2886
2887         TALLOC_FREE(ctx);
2888
2889         return ret;
2890 }
2891
2892 PAM_EXTERN
2893 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2894                         int argc, const char **argv)
2895 {
2896         int ret = PAM_SUCCESS;
2897         struct pwb_context *ctx = NULL;
2898
2899         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2900         if (ret) {
2901                 goto out;
2902         }
2903
2904         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2905
2906         if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2907                 /* check and create homedir */
2908                 ret = _pam_mkhomedir(ctx);
2909         }
2910  out:
2911         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2912
2913         TALLOC_FREE(ctx);
2914
2915         return ret;
2916 }
2917
2918 PAM_EXTERN
2919 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2920                          int argc, const char **argv)
2921 {
2922         int ret = PAM_SUCCESS;
2923         struct pwb_context *ctx = NULL;
2924
2925         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2926         if (ret) {
2927                 goto out;
2928         }
2929
2930         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2931
2932 out:
2933         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2934
2935         TALLOC_FREE(ctx);
2936
2937         return ret;
2938 }
2939
2940 /**
2941  * evaluate whether we need to re-authenticate with kerberos after a
2942  * password change
2943  *
2944  * @param ctx PAM winbind context.
2945  * @param user The username
2946  *
2947  * @return boolean Returns true if required, false if not.
2948  */
2949
2950 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2951                                                    const char *user)
2952 {
2953
2954         /* Make sure that we only do this if a) the chauthtok got initiated
2955          * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2956          * later password change via the "passwd" command if done by the user
2957          * itself
2958          * NB. If we login from gdm or xdm and the password expires,
2959          * we change the password, but there is no memory cache.
2960          * Thus, even for passthrough login, we should do the
2961          * authentication again to update memory cache.
2962          * --- BoYang
2963          * */
2964
2965         char *new_authtok_reqd_during_auth = NULL;
2966         struct passwd *pwd = NULL;
2967
2968         pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2969                       (const void **) &new_authtok_reqd_during_auth);
2970         pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2971                      NULL, NULL);
2972
2973         if (new_authtok_reqd_during_auth) {
2974                 return true;
2975         }
2976
2977         pwd = getpwnam(user);
2978         if (!pwd) {
2979                 return false;
2980         }
2981
2982         if (getuid() == pwd->pw_uid) {
2983                 return true;
2984         }
2985
2986         return false;
2987 }
2988
2989
2990 PAM_EXTERN
2991 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2992                      int argc, const char **argv)
2993 {
2994         unsigned int lctrl;
2995         int ret;
2996         bool cached_login = false;
2997
2998         /* <DO NOT free() THESE> */
2999         const char *user;
3000         const char *pass_old;
3001         const char *pass_new;
3002         /* </DO NOT free() THESE> */
3003
3004         char *Announce;
3005
3006         int retry = 0;
3007         char *username_ret = NULL;
3008         struct wbcAuthErrorInfo *error = NULL;
3009         struct pwb_context *ctx = NULL;
3010
3011         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
3012         if (ret) {
3013                 goto out;
3014         }
3015
3016         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
3017
3018         cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
3019
3020         /* clearing offline bit for auth */
3021         ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
3022
3023         /*
3024          * First get the name of a user
3025          */
3026         ret = pam_get_user(pamh, &user, _("Username: "));
3027         if (ret) {
3028                 _pam_log(ctx, LOG_ERR,
3029                          "password - could not identify user");
3030                 goto out;
3031         }
3032
3033         if (user == NULL) {
3034                 _pam_log(ctx, LOG_ERR, "username was NULL!");
3035                 ret = PAM_USER_UNKNOWN;
3036                 goto out;
3037         }
3038
3039         _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
3040
3041         /* check if this is really a user in winbindd, not only in NSS */
3042         ret = valid_user(ctx, user);
3043         switch (ret) {
3044                 case 1:
3045                         ret = PAM_USER_UNKNOWN;
3046                         goto out;
3047                 case -1:
3048                         ret = PAM_SYSTEM_ERR;
3049                         goto out;
3050                 default:
3051                         break;
3052         }
3053
3054         /*
3055          * obtain and verify the current password (OLDAUTHTOK) for
3056          * the user.
3057          */
3058
3059         if (flags & PAM_PRELIM_CHECK) {
3060                 time_t pwdlastset_prelim = 0;
3061
3062                 /* instruct user what is happening */
3063
3064 #define greeting _("Changing password for")
3065                 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
3066                 if (!Announce) {
3067                         _pam_log(ctx, LOG_CRIT,
3068                                  "password - out of memory");
3069                         ret = PAM_BUF_ERR;
3070                         goto out;
3071                 }
3072 #undef greeting
3073
3074                 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
3075                 ret = _winbind_read_password(ctx, lctrl,
3076                                                 Announce,
3077                                                 _("(current) NT password: "),
3078                                                 NULL,
3079                                                 (const char **) &pass_old);
3080                 TALLOC_FREE(Announce);
3081                 if (ret != PAM_SUCCESS) {
3082                         _pam_log(ctx, LOG_NOTICE,
3083                                  "password - (old) token not obtained");
3084                         goto out;
3085                 }
3086
3087                 /* verify that this is the password for this user */
3088
3089                 ret = winbind_auth_request(ctx, user, pass_old,
3090                                            NULL, NULL, 0,
3091                                            &error, NULL, NULL,
3092                                            &pwdlastset_prelim, NULL);
3093
3094                 if (ret != PAM_ACCT_EXPIRED &&
3095                     ret != PAM_AUTHTOK_EXPIRED &&
3096                     ret != PAM_NEW_AUTHTOK_REQD &&
3097                     ret != PAM_SUCCESS) {
3098                         pass_old = NULL;
3099                         goto out;
3100                 }
3101
3102                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3103                              (void *)pwdlastset_prelim, NULL);
3104
3105                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3106                                    (const void *) pass_old);
3107                 pass_old = NULL;
3108                 if (ret != PAM_SUCCESS) {
3109                         _pam_log(ctx, LOG_CRIT,
3110                                  "failed to set PAM_OLDAUTHTOK");
3111                 }
3112         } else if (flags & PAM_UPDATE_AUTHTOK) {
3113
3114                 time_t pwdlastset_update = 0;
3115
3116                 /*
3117                  * obtain the proposed password
3118                  */
3119
3120                 /*
3121                  * get the old token back.
3122                  */
3123
3124                 ret = pam_get_item(pamh, PAM_OLDAUTHTOK, (const void **) &pass_old);
3125
3126                 if (ret != PAM_SUCCESS) {
3127                         _pam_log(ctx, LOG_NOTICE,
3128                                  "user not authenticated");
3129                         goto out;
3130                 }
3131
3132                 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3133
3134                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3135                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3136                 }
3137                 retry = 0;
3138                 ret = PAM_AUTHTOK_ERR;
3139                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3140                         /*
3141                          * use_authtok is to force the use of a previously entered
3142                          * password -- needed for pluggable password strength checking
3143                          */
3144
3145                         ret = _winbind_read_password(ctx, lctrl,
3146                                                      NULL,
3147                                                      _("Enter new NT password: "),
3148                                                      _("Retype new NT password: "),
3149                                                      (const char **)&pass_new);
3150
3151                         if (ret != PAM_SUCCESS) {
3152                                 _pam_log_debug(ctx, LOG_ALERT,
3153                                                "password - "
3154                                                "new password not obtained");
3155                                 pass_old = NULL;/* tidy up */
3156                                 goto out;
3157                         }
3158
3159                         /*
3160                          * At this point we know who the user is and what they
3161                          * propose as their new password. Verify that the new
3162                          * password is acceptable.
3163                          */
3164
3165                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
3166                                 pass_new = NULL;
3167                         }
3168                 }
3169
3170                 /*
3171                  * By reaching here we have approved the passwords and must now
3172                  * rebuild the password database file.
3173                  */
3174                 pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3175                              (const void **) &pwdlastset_update);
3176
3177                 /*
3178                  * if cached creds were enabled, make sure to set the
3179                  * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3180                  * update the cached creds storage - gd
3181                  */
3182                 if (cached_login) {
3183                         ctx->ctrl |= WINBIND_CACHED_LOGIN;
3184                 }
3185
3186                 ret = winbind_chauthtok_request(ctx, user, pass_old,
3187                                                 pass_new, pwdlastset_update);
3188                 if (ret) {
3189                         pass_old = pass_new = NULL;
3190                         goto out;
3191                 }
3192
3193                 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3194
3195                         const char *member = NULL;
3196                         const char *cctype = NULL;
3197                         int warn_pwd_expire;
3198                         struct wbcLogonUserInfo *info = NULL;
3199                         struct wbcUserPasswordPolicyInfo *policy = NULL;
3200
3201                         member = get_member_from_config(ctx);
3202                         cctype = get_krb5_cc_type_from_config(ctx);
3203                         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3204
3205                         /* Keep WINBIND_CACHED_LOGIN bit for
3206                          * authentication after changing the password.
3207                          * This will update the cached credentials in case
3208                          * that winbindd_dual_pam_chauthtok() fails
3209                          * to update them.
3210                          * --- BoYang
3211                          * */
3212
3213                         ret = winbind_auth_request(ctx, user, pass_new,
3214                                                    member, cctype, 0,
3215                                                    &error, &info, &policy,
3216                                                    NULL, &username_ret);
3217                         pass_old = pass_new = NULL;
3218
3219                         if (ret == PAM_SUCCESS) {
3220
3221                                 struct wbcAuthUserInfo *user_info = NULL;
3222
3223                                 if (info && info->info) {
3224                                         user_info = info->info;
3225                                 }
3226
3227                                 /* warn a user if the password is about to
3228                                  * expire soon */
3229                                 _pam_warn_password_expiry(ctx, user_info, policy,
3230                                                           warn_pwd_expire,
3231                                                           NULL, NULL);
3232
3233                                 /* set some info3 info for other modules in the
3234                                  * stack */
3235                                 _pam_set_data_info3(ctx, user_info);
3236
3237                                 /* put krb5ccname into env */
3238                                 _pam_setup_krb5_env(ctx, info);
3239
3240                                 if (username_ret) {
3241                                         pam_set_item(pamh, PAM_USER,
3242                                                      username_ret);
3243                                         _pam_log_debug(ctx, LOG_INFO,
3244                                                        "Returned user was '%s'",
3245                                                        username_ret);
3246                                         free(username_ret);
3247                                 }
3248
3249                         }
3250
3251                         if (info && info->blobs) {
3252                                 wbcFreeMemory(info->blobs);
3253                         }
3254                         wbcFreeMemory(info);
3255                         wbcFreeMemory(policy);
3256
3257                         goto out;
3258                 }
3259         } else {
3260                 ret = PAM_SERVICE_ERR;
3261         }
3262
3263 out:
3264         {
3265                 /* Deal with offline errors. */
3266                 int i;
3267                 const char *codes[] = {
3268                         "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3269                         "NT_STATUS_NO_LOGON_SERVERS",
3270                         "NT_STATUS_ACCESS_DENIED"
3271                 };
3272
3273                 for (i=0; i<ARRAY_SIZE(codes); i++) {
3274                         int _ret;
3275                         if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3276                                 break;
3277                         }
3278                 }
3279         }
3280
3281         wbcFreeMemory(error);
3282
3283         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3284
3285         TALLOC_FREE(ctx);
3286
3287         return ret;
3288 }
3289
3290 #ifdef PAM_STATIC
3291
3292 /* static module data */
3293
3294 struct pam_module _pam_winbind_modstruct = {
3295         MODULE_NAME,
3296         pam_sm_authenticate,
3297         pam_sm_setcred,
3298         pam_sm_acct_mgmt,
3299         pam_sm_open_session,
3300         pam_sm_close_session,
3301         pam_sm_chauthtok
3302 };
3303
3304 #endif
3305
3306 /*
3307  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
3308  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
3309  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3310  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2008
3311  * Copyright (c) Jan Rêkorajski 1999.
3312  * Copyright (c) Andrew G. Morgan 1996-8.
3313  * Copyright (c) Alex O. Yuriev, 1996.
3314  * Copyright (c) Cristian Gafton 1996.
3315  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3316  *
3317  * Redistribution and use in source and binary forms, with or without
3318  * modification, are permitted provided that the following conditions
3319  * are met:
3320  * 1. Redistributions of source code must retain the above copyright
3321  *    notice, and the entire permission notice in its entirety,
3322  *    including the disclaimer of warranties.
3323  * 2. Redistributions in binary form must reproduce the above copyright
3324  *    notice, this list of conditions and the following disclaimer in the
3325  *    documentation and/or other materials provided with the distribution.
3326  * 3. The name of the author may not be used to endorse or promote
3327  *    products derived from this software without specific prior
3328  *    written permission.
3329  *
3330  * ALTERNATIVELY, this product may be distributed under the terms of
3331  * the GNU Public License, in which case the provisions of the GPL are
3332  * required INSTEAD OF the above restrictions.  (This clause is
3333  * necessary due to a potential bad interaction between the GPL and
3334  * the restrictions contained in a BSD-style copyright.)
3335  *
3336  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3337  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3338  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3339  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3340  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3341  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3342  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3343  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3344  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3345  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3346  * OF THE POSSIBILITY OF SUCH DAMAGE.
3347  */