source/nsswitch/pam_winbind.c

   1 /* pam_winbind module
   2
   3    Copyright Andrew Tridgell <tridge@samba.org> 2000
   4    Copyright Tim Potter <tpot@samba.org> 2000
   5    Copyright Andrew Bartlett <abartlet@samba.org> 2002
   6    Copyright Guenther Deschner <gd@samba.org> 2005-2008
   7
   8    largely based on pam_userdb by Cristian Gafton <gafton@redhat.com> also
   9    contains large slabs of code from pam_unix by Elliot Lee
  10    <sopwith@redhat.com> (see copyright below for full details)
  11 */
  12
  13 #include "pam_winbind.h"
  14
  15 static int wbc_error_to_pam_error(wbcErr status)
  16 {
  17         switch (status) {
  18                 case WBC_ERR_SUCCESS:
  19                         return PAM_SUCCESS;
  20                 case WBC_ERR_NOT_IMPLEMENTED:
  21                         return PAM_SERVICE_ERR;
  22                 case WBC_ERR_UNKNOWN_FAILURE:
  23                         break;
  24                 case WBC_ERR_NO_MEMORY:
  25                         return PAM_BUF_ERR;
  26                 case WBC_ERR_INVALID_SID:
  27                 case WBC_ERR_INVALID_PARAM:
  28                         break;
  29                 case WBC_ERR_WINBIND_NOT_AVAILABLE:
  30                         return PAM_AUTHINFO_UNAVAIL;
  31                 case WBC_ERR_DOMAIN_NOT_FOUND:
  32                         return PAM_AUTHINFO_UNAVAIL;
  33                 case WBC_ERR_INVALID_RESPONSE:
  34                         return PAM_BUF_ERR;
  35                 case WBC_ERR_NSS_ERROR:
  36                         return PAM_USER_UNKNOWN;
  37                 case WBC_ERR_AUTH_ERROR:
  38                         return PAM_AUTH_ERR;
  39                 case WBC_ERR_UNKNOWN_USER:
  40                         return PAM_USER_UNKNOWN;
  41                 case WBC_ERR_UNKNOWN_GROUP:
  42                         return PAM_USER_UNKNOWN;
  43                 case WBC_ERR_PWD_CHANGE_FAILED:
  44                         break;
  45         }
  46
  47         /* be paranoid */
  48         return PAM_AUTH_ERR;
  49 }
  50
  51 static const char *_pam_error_code_str(int err)
  52 {
  53         switch (err) {
  54                 case PAM_SUCCESS:
  55                         return "PAM_SUCCESS";
  56                 case PAM_OPEN_ERR:
  57                         return "PAM_OPEN_ERR";
  58                 case PAM_SYMBOL_ERR:
  59                         return "PAM_SYMBOL_ERR";
  60                 case PAM_SERVICE_ERR:
  61                         return "PAM_SERVICE_ERR";
  62                 case PAM_SYSTEM_ERR:
  63                         return "PAM_SYSTEM_ERR";
  64                 case PAM_BUF_ERR:
  65                         return "PAM_BUF_ERR";
  66                 case PAM_PERM_DENIED:
  67                         return "PAM_PERM_DENIED";
  68                 case PAM_AUTH_ERR:
  69                         return "PAM_AUTH_ERR";
  70                 case PAM_CRED_INSUFFICIENT:
  71                         return "PAM_CRED_INSUFFICIENT";
  72                 case PAM_AUTHINFO_UNAVAIL:
  73                         return "PAM_AUTHINFO_UNAVAIL";
  74                 case PAM_USER_UNKNOWN:
  75                         return "PAM_USER_UNKNOWN";
  76                 case PAM_MAXTRIES:
  77                         return "PAM_MAXTRIES";
  78                 case PAM_NEW_AUTHTOK_REQD:
  79                         return "PAM_NEW_AUTHTOK_REQD";
  80                 case PAM_ACCT_EXPIRED:
  81                         return "PAM_ACCT_EXPIRED";
  82                 case PAM_SESSION_ERR:
  83                         return "PAM_SESSION_ERR";
  84                 case PAM_CRED_UNAVAIL:
  85                         return "PAM_CRED_UNAVAIL";
  86                 case PAM_CRED_EXPIRED:
  87                         return "PAM_CRED_EXPIRED";
  88                 case PAM_CRED_ERR:
  89                         return "PAM_CRED_ERR";
  90                 case PAM_NO_MODULE_DATA:
  91                         return "PAM_NO_MODULE_DATA";
  92                 case PAM_CONV_ERR:
  93                         return "PAM_CONV_ERR";
  94                 case PAM_AUTHTOK_ERR:
  95                         return "PAM_AUTHTOK_ERR";
  96                 case PAM_AUTHTOK_RECOVERY_ERR:
  97                         return "PAM_AUTHTOK_RECOVERY_ERR";
  98                 case PAM_AUTHTOK_LOCK_BUSY:
  99                         return "PAM_AUTHTOK_LOCK_BUSY";
 100                 case PAM_AUTHTOK_DISABLE_AGING:
 101                         return "PAM_AUTHTOK_DISABLE_AGING";
 102                 case PAM_TRY_AGAIN:
 103                         return "PAM_TRY_AGAIN";
 104                 case PAM_IGNORE:
 105                         return "PAM_IGNORE";
 106                 case PAM_ABORT:
 107                         return "PAM_ABORT";
 108                 case PAM_AUTHTOK_EXPIRED:
 109                         return "PAM_AUTHTOK_EXPIRED";
 110 #ifdef PAM_MODULE_UNKNOWN
 111                 case PAM_MODULE_UNKNOWN:
 112                         return "PAM_MODULE_UNKNOWN";
 113 #endif
 114 #ifdef PAM_BAD_ITEM
 115                 case PAM_BAD_ITEM:
 116                         return "PAM_BAD_ITEM";
 117 #endif
 118 #ifdef PAM_CONV_AGAIN
 119                 case PAM_CONV_AGAIN:
 120                         return "PAM_CONV_AGAIN";
 121 #endif
 122 #ifdef PAM_INCOMPLETE
 123                 case PAM_INCOMPLETE:
 124                         return "PAM_INCOMPLETE";
 125 #endif
 126                 default:
 127                         return NULL;
 128         }
 129 }
 130
 131 #define _PAM_LOG_FUNCTION_ENTER(function, ctx) \
 132         do { \
 133                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] ENTER: " \
 134                                function " (flags: 0x%04x)", ctx->pamh, ctx->flags); \
 135                 _pam_log_state(ctx); \
 136         } while (0)
 137
 138 #define _PAM_LOG_FUNCTION_LEAVE(function, ctx, retval) \
 139         do { \
 140                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] LEAVE: " \
 141                                function " returning %d (%s)", ctx->pamh, retval, \
 142                                _pam_error_code_str(retval)); \
 143                 _pam_log_state(ctx); \
 144         } while (0)
 145
 146 /* data tokens */
 147
 148 #define MAX_PASSWD_TRIES        3
 149
 150 #ifdef HAVE_GETTEXT
 151 static char initialized = 0;
 152
 153 static inline void textdomain_init(void);
 154 static inline void textdomain_init(void)
 155 {
 156         if (!initialized) {
 157                 bindtextdomain(MODULE_NAME, dyn_LOCALEDIR);
 158                 initialized = 1;
 159         }
 160         return;
 161 }
 162 #endif
 163
 164
 165 /*
 166  * Work around the pam API that has functions with void ** as parameters
 167  * These lead to strict aliasing warnings with gcc.
 168  */
 169 static int _pam_get_item(const pam_handle_t *pamh,
 170                          int item_type,
 171                          const void *_item)
 172 {
 173         const void **item = (const void **)_item;
 174         return pam_get_item(pamh, item_type, item);
 175 }
 176 static int _pam_get_data(const pam_handle_t *pamh,
 177                          const char *module_data_name,
 178                          const void *_data)
 179 {
 180         const void **data = (const void **)_data;
 181         return pam_get_data(pamh, module_data_name, data);
 182 }
 183
 184 /* some syslogging */
 185
 186 #ifdef HAVE_PAM_VSYSLOG
 187 static void _pam_log_int(const pam_handle_t *pamh,
 188                          int err,
 189                          const char *format,
 190                          va_list args)
 191 {
 192         pam_vsyslog(pamh, err, format, args);
 193 }
 194 #else
 195 static void _pam_log_int(const pam_handle_t *pamh,
 196                          int err,
 197                          const char *format,
 198                          va_list args)
 199 {
 200         char *format2 = NULL;
 201         const char *service;
 202
 203         _pam_get_item(pamh, PAM_SERVICE, &service);
 204
 205         format2 = (char *)malloc(strlen(MODULE_NAME)+strlen(format)+strlen(service)+5);
 206         if (format2 == NULL) {
 207                 /* what else todo ? */
 208                 vsyslog(err, format, args);
 209                 return;
 210         }
 211
 212         sprintf(format2, "%s(%s): %s", MODULE_NAME, service, format);
 213         vsyslog(err, format2, args);
 214         SAFE_FREE(format2);
 215 }
 216 #endif /* HAVE_PAM_VSYSLOG */
 217
 218 static bool _pam_log_is_silent(int ctrl)
 219 {
 220         return on(ctrl, WINBIND_SILENT);
 221 }
 222
 223 static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 224 static void _pam_log(struct pwb_context *r, int err, const char *format, ...)
 225 {
 226         va_list args;
 227
 228         if (_pam_log_is_silent(r->ctrl)) {
 229                 return;
 230         }
 231
 232         va_start(args, format);
 233         _pam_log_int(r->pamh, err, format, args);
 234         va_end(args);
 235 }
 236 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 237 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 238 {
 239         va_list args;
 240
 241         if (_pam_log_is_silent(ctrl)) {
 242                 return;
 243         }
 244
 245         va_start(args, format);
 246         _pam_log_int(pamh, err, format, args);
 247         va_end(args);
 248 }
 249
 250 static bool _pam_log_is_debug_enabled(int ctrl)
 251 {
 252         if (ctrl == -1) {
 253                 return false;
 254         }
 255
 256         if (_pam_log_is_silent(ctrl)) {
 257                 return false;
 258         }
 259
 260         if (!(ctrl & WINBIND_DEBUG_ARG)) {
 261                 return false;
 262         }
 263
 264         return true;
 265 }
 266
 267 static bool _pam_log_is_debug_state_enabled(int ctrl)
 268 {
 269         if (!(ctrl & WINBIND_DEBUG_STATE)) {
 270                 return false;
 271         }
 272
 273         return _pam_log_is_debug_enabled(ctrl);
 274 }
 275
 276 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 277 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...)
 278 {
 279         va_list args;
 280
 281         if (!_pam_log_is_debug_enabled(r->ctrl)) {
 282                 return;
 283         }
 284
 285         va_start(args, format);
 286         _pam_log_int(r->pamh, err, format, args);
 287         va_end(args);
 288 }
 289 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 290 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 291 {
 292         va_list args;
 293
 294         if (!_pam_log_is_debug_enabled(ctrl)) {
 295                 return;
 296         }
 297
 298         va_start(args, format);
 299         _pam_log_int(pamh, err, format, args);
 300         va_end(args);
 301 }
 302
 303 static void _pam_log_state_datum(struct pwb_context *ctx,
 304                                  int item_type,
 305                                  const char *key,
 306                                  int is_string)
 307 {
 308         const void *data = NULL;
 309         if (item_type != 0) {
 310                 pam_get_item(ctx->pamh, item_type, &data);
 311         } else {
 312                 pam_get_data(ctx->pamh, key, &data);
 313         }
 314         if (data != NULL) {
 315                 const char *type = (item_type != 0) ? "ITEM" : "DATA";
 316                 if (is_string != 0) {
 317                         _pam_log_debug(ctx, LOG_DEBUG,
 318                                        "[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
 319                                        ctx->pamh, type, key, (const char *)data,
 320                                        data);
 321                 } else {
 322                         _pam_log_debug(ctx, LOG_DEBUG,
 323                                        "[pamh: %p] STATE: %s(%s) = %p",
 324                                        ctx->pamh, type, key, data);
 325                 }
 326         }
 327 }
 328
 329 #define _PAM_LOG_STATE_DATA_POINTER(ctx, module_data_name) \
 330         _pam_log_state_datum(ctx, 0, module_data_name, 0)
 331
 332 #define _PAM_LOG_STATE_DATA_STRING(ctx, module_data_name) \
 333         _pam_log_state_datum(ctx, 0, module_data_name, 1)
 334
 335 #define _PAM_LOG_STATE_ITEM_POINTER(ctx, item_type) \
 336         _pam_log_state_datum(ctx, item_type, #item_type, 0)
 337
 338 #define _PAM_LOG_STATE_ITEM_STRING(ctx, item_type) \
 339         _pam_log_state_datum(ctx, item_type, #item_type, 1)
 340
 341 #ifdef DEBUG_PASSWORD
 342 #define _LOG_PASSWORD_AS_STRING 1
 343 #else
 344 #define _LOG_PASSWORD_AS_STRING 0
 345 #endif
 346
 347 #define _PAM_LOG_STATE_ITEM_PASSWORD(ctx, item_type) \
 348         _pam_log_state_datum(ctx, item_type, #item_type, \
 349                              _LOG_PASSWORD_AS_STRING)
 350
 351 static void _pam_log_state(struct pwb_context *ctx)
 352 {
 353         if (!_pam_log_is_debug_state_enabled(ctx->ctrl)) {
 354                 return;
 355         }
 356
 357         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
 358         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
 359         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
 360         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
 361         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
 362         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
 363         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
 364         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
 365         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
 366 #ifdef PAM_FAIL_DELAY
 367         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
 368 #endif
 369 #ifdef PAM_REPOSITORY
 370         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
 371 #endif
 372
 373         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
 374         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
 375         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
 376         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
 377         _PAM_LOG_STATE_DATA_STRING(ctx,
 378                                    PAM_WINBIND_NEW_AUTHTOK_REQD);
 379                                    /* Use atoi to get PAM result code */
 380         _PAM_LOG_STATE_DATA_STRING(ctx,
 381                                    PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
 382         _PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
 383 }
 384
 385 static int _pam_parse(const pam_handle_t *pamh,
 386                       int flags,
 387                       int argc,
 388                       const char **argv,
 389                       dictionary **result_d)
 390 {
 391         int ctrl = 0;
 392         const char *config_file = NULL;
 393         int i;
 394         const char **v;
 395         dictionary *d = NULL;
 396
 397         if (flags & PAM_SILENT) {
 398                 ctrl |= WINBIND_SILENT;
 399         }
 400
 401         for (i=argc,v=argv; i-- > 0; ++v) {
 402                 if (!strncasecmp(*v, "config", strlen("config"))) {
 403                         ctrl |= WINBIND_CONFIG_FILE;
 404                         config_file = v[i];
 405                         break;
 406                 }
 407         }
 408
 409         if (config_file == NULL) {
 410                 config_file = PAM_WINBIND_CONFIG_FILE;
 411         }
 412
 413         d = iniparser_load(config_file);
 414         if (d == NULL) {
 415                 goto config_from_pam;
 416         }
 417
 418         if (iniparser_getboolean(d, "global:debug", false)) {
 419                 ctrl |= WINBIND_DEBUG_ARG;
 420         }
 421
 422         if (iniparser_getboolean(d, "global:debug_state", false)) {
 423                 ctrl |= WINBIND_DEBUG_STATE;
 424         }
 425
 426         if (iniparser_getboolean(d, "global:cached_login", false)) {
 427                 ctrl |= WINBIND_CACHED_LOGIN;
 428         }
 429
 430         if (iniparser_getboolean(d, "global:krb5_auth", false)) {
 431                 ctrl |= WINBIND_KRB5_AUTH;
 432         }
 433
 434         if (iniparser_getboolean(d, "global:silent", false)) {
 435                 ctrl |= WINBIND_SILENT;
 436         }
 437
 438         if (iniparser_getstr(d, "global:krb5_ccache_type") != NULL) {
 439                 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 440         }
 441
 442         if ((iniparser_getstr(d, "global:require-membership-of") != NULL) ||
 443             (iniparser_getstr(d, "global:require_membership_of") != NULL)) {
 444                 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 445         }
 446
 447         if (iniparser_getboolean(d, "global:try_first_pass", false)) {
 448                 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 449         }
 450
 451         if (iniparser_getint(d, "global:warn_pwd_expire", 0)) {
 452                 ctrl |= WINBIND_WARN_PWD_EXPIRE;
 453         }
 454
 455 config_from_pam:
 456         /* step through arguments */
 457         for (i=argc,v=argv; i-- > 0; ++v) {
 458
 459                 /* generic options */
 460                 if (!strcmp(*v,"debug"))
 461                         ctrl |= WINBIND_DEBUG_ARG;
 462                 else if (!strcasecmp(*v, "debug_state"))
 463                         ctrl |= WINBIND_DEBUG_STATE;
 464                 else if (!strcasecmp(*v, "silent"))
 465                         ctrl |= WINBIND_SILENT;
 466                 else if (!strcasecmp(*v, "use_authtok"))
 467                         ctrl |= WINBIND_USE_AUTHTOK_ARG;
 468                 else if (!strcasecmp(*v, "use_first_pass"))
 469                         ctrl |= WINBIND_USE_FIRST_PASS_ARG;
 470                 else if (!strcasecmp(*v, "try_first_pass"))
 471                         ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 472                 else if (!strcasecmp(*v, "unknown_ok"))
 473                         ctrl |= WINBIND_UNKNOWN_OK_ARG;
 474                 else if (!strncasecmp(*v, "require_membership_of",
 475                                       strlen("require_membership_of")))
 476                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 477                 else if (!strncasecmp(*v, "require-membership-of",
 478                                       strlen("require-membership-of")))
 479                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 480                 else if (!strcasecmp(*v, "krb5_auth"))
 481                         ctrl |= WINBIND_KRB5_AUTH;
 482                 else if (!strncasecmp(*v, "krb5_ccache_type",
 483                                       strlen("krb5_ccache_type")))
 484                         ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 485                 else if (!strcasecmp(*v, "cached_login"))
 486                         ctrl |= WINBIND_CACHED_LOGIN;
 487                 else {
 488                         __pam_log(pamh, ctrl, LOG_ERR,
 489                                  "pam_parse: unknown option: %s", *v);
 490                         return -1;
 491                 }
 492
 493         }
 494
 495         if (result_d) {
 496                 *result_d = d;
 497         } else {
 498                 if (d) {
 499                         iniparser_freedict(d);
 500                 }
 501         }
 502
 503         return ctrl;
 504 };
 505
 506 static int _pam_winbind_free_context(struct pwb_context *ctx)
 507 {
 508         if (!ctx) {
 509                 return 0;
 510         }
 511
 512         if (ctx->dict) {
 513                 iniparser_freedict(ctx->dict);
 514         }
 515
 516         return 0;
 517 }
 518
 519 static int _pam_winbind_init_context(pam_handle_t *pamh,
 520                                      int flags,
 521                                      int argc,
 522                                      const char **argv,
 523                                      struct pwb_context **ctx_p)
 524 {
 525         struct pwb_context *r = NULL;
 526
 527 #ifdef HAVE_GETTEXT
 528         textdomain_init();
 529 #endif
 530
 531         r = TALLOC_ZERO_P(NULL, struct pwb_context);
 532         if (!r) {
 533                 return PAM_BUF_ERR;
 534         }
 535
 536         talloc_set_destructor(r, _pam_winbind_free_context);
 537
 538         r->pamh = pamh;
 539         r->flags = flags;
 540         r->argc = argc;
 541         r->argv = argv;
 542         r->ctrl = _pam_parse(pamh, flags, argc, argv, &r->dict);
 543         if (r->ctrl == -1) {
 544                 TALLOC_FREE(r);
 545                 return PAM_SYSTEM_ERR;
 546         }
 547
 548         *ctx_p = r;
 549
 550         return PAM_SUCCESS;
 551 }
 552
 553 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
 554                                       void *data,
 555                                       int error_status)
 556 {
 557         int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
 558         if (_pam_log_is_debug_state_enabled(ctrl)) {
 559                 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
 560                                "[pamh: %p] CLEAN: cleaning up PAM data %p "
 561                                "(error_status = %d)", pamh, data,
 562                                error_status);
 563         }
 564         TALLOC_FREE(data);
 565 }
 566
 567
 568 static const struct ntstatus_errors {
 569         const char *ntstatus_string;
 570         const char *error_string;
 571 } ntstatus_errors[] = {
 572         {"NT_STATUS_OK",
 573                 N_("Success")},
 574         {"NT_STATUS_BACKUP_CONTROLLER",
 575                 N_("No primary Domain Controler available")},
 576         {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
 577                 N_("No domain controllers found")},
 578         {"NT_STATUS_NO_LOGON_SERVERS",
 579                 N_("No logon servers")},
 580         {"NT_STATUS_PWD_TOO_SHORT",
 581                 N_("Password too short")},
 582         {"NT_STATUS_PWD_TOO_RECENT",
 583                 N_("The password of this user is too recent to change")},
 584         {"NT_STATUS_PWD_HISTORY_CONFLICT",
 585                 N_("Password is already in password history")},
 586         {"NT_STATUS_PASSWORD_EXPIRED",
 587                 N_("Your password has expired")},
 588         {"NT_STATUS_PASSWORD_MUST_CHANGE",
 589                 N_("You need to change your password now")},
 590         {"NT_STATUS_INVALID_WORKSTATION",
 591                 N_("You are not allowed to logon from this workstation")},
 592         {"NT_STATUS_INVALID_LOGON_HOURS",
 593                 N_("You are not allowed to logon at this time")},
 594         {"NT_STATUS_ACCOUNT_EXPIRED",
 595                 N_("Your account has expired. "
 596                    "Please contact your System administrator")}, /* SCNR */
 597         {"NT_STATUS_ACCOUNT_DISABLED",
 598                 N_("Your account is disabled. "
 599                    "Please contact your System administrator")}, /* SCNR */
 600         {"NT_STATUS_ACCOUNT_LOCKED_OUT",
 601                 N_("Your account has been locked. "
 602                    "Please contact your System administrator")}, /* SCNR */
 603         {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
 604                 N_("Invalid Trust Account")},
 605         {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
 606                 N_("Invalid Trust Account")},
 607         {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
 608                 N_("Invalid Trust Account")},
 609         {"NT_STATUS_ACCESS_DENIED",
 610                 N_("Access is denied")},
 611         {NULL, NULL}
 612 };
 613
 614 static const char *_get_ntstatus_error_string(const char *nt_status_string)
 615 {
 616         int i;
 617         for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
 618                 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
 619                                 nt_status_string)) {
 620                         return _(ntstatus_errors[i].error_string);
 621                 }
 622         }
 623         return NULL;
 624 }
 625
 626 /* --- authentication management functions --- */
 627
 628 /* Attempt a conversation */
 629
 630 static int converse(const pam_handle_t *pamh,
 631                     int nargs,
 632                     struct pam_message **message,
 633                     struct pam_response **response)
 634 {
 635         int retval;
 636         struct pam_conv *conv;
 637
 638         retval = _pam_get_item(pamh, PAM_CONV, &conv);
 639         if (retval == PAM_SUCCESS) {
 640                 retval = conv->conv(nargs,
 641                                     (const struct pam_message **)message,
 642                                     response, conv->appdata_ptr);
 643         }
 644
 645         return retval; /* propagate error status */
 646 }
 647
 648
 649 static int _make_remark(struct pwb_context *ctx,
 650                         int type,
 651                         const char *text)
 652 {
 653         int retval = PAM_SUCCESS;
 654
 655         struct pam_message *pmsg[1], msg[1];
 656         struct pam_response *resp;
 657
 658         if (ctx->flags & WINBIND_SILENT) {
 659                 return PAM_SUCCESS;
 660         }
 661
 662         pmsg[0] = &msg[0];
 663         msg[0].msg = discard_const_p(char, text);
 664         msg[0].msg_style = type;
 665
 666         resp = NULL;
 667         retval = converse(ctx->pamh, 1, pmsg, &resp);
 668
 669         if (resp) {
 670                 _pam_drop_reply(resp, 1);
 671         }
 672         return retval;
 673 }
 674
 675 static int _make_remark_v(struct pwb_context *ctx,
 676                           int type,
 677                           const char *format,
 678                           va_list args)
 679 {
 680         char *var;
 681         int ret;
 682
 683         ret = vasprintf(&var, format, args);
 684         if (ret < 0) {
 685                 _pam_log(ctx, LOG_ERR, "memory allocation failure");
 686                 return ret;
 687         }
 688
 689         ret = _make_remark(ctx, type, var);
 690         SAFE_FREE(var);
 691         return ret;
 692 }
 693
 694 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 695 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
 696 {
 697         int ret;
 698         va_list args;
 699
 700         va_start(args, format);
 701         ret = _make_remark_v(ctx, type, format, args);
 702         va_end(args);
 703         return ret;
 704 }
 705
 706 static int pam_winbind_request(struct pwb_context *ctx,
 707                                enum winbindd_cmd req_type,
 708                                struct winbindd_request *request,
 709                                struct winbindd_response *response)
 710 {
 711         /* Fill in request and send down pipe */
 712         winbindd_init_request(request, req_type);
 713
 714         if (winbind_write_sock(request, sizeof(*request), 0, 0) == -1) {
 715                 _pam_log(ctx, LOG_ERR,
 716                          "pam_winbind_request: write to socket failed!");
 717                 winbind_close_sock();
 718                 return PAM_SERVICE_ERR;
 719         }
 720
 721         /* Wait for reply */
 722         if (winbindd_read_reply(response) == -1) {
 723                 _pam_log(ctx, LOG_ERR,
 724                          "pam_winbind_request: read from socket failed!");
 725                 winbind_close_sock();
 726                 return PAM_SERVICE_ERR;
 727         }
 728
 729         /* We are done with the socket - close it and avoid mischeif */
 730         winbind_close_sock();
 731
 732         /* Copy reply data from socket */
 733         if (response->result == WINBINDD_OK) {
 734                 return PAM_SUCCESS;
 735         }
 736
 737         /* no need to check for pam_error codes for getpwnam() */
 738         switch (req_type) {
 739
 740                 case WINBINDD_LOOKUPNAME:
 741                         if (strlen(response->data.auth.nt_status_string) > 0) {
 742                                 _pam_log(ctx, LOG_ERR,
 743                                          "request failed, NT error was %s",
 744                                          response->data.auth.nt_status_string);
 745                         } else {
 746                                 _pam_log(ctx, LOG_ERR, "request failed");
 747                         }
 748                         return PAM_USER_UNKNOWN;
 749                 default:
 750                         break;
 751         }
 752
 753         if (response->data.auth.pam_error != PAM_SUCCESS) {
 754                 _pam_log(ctx, LOG_ERR,
 755                          "request failed: %s, "
 756                          "PAM error was %s (%d), NT error was %s",
 757                          response->data.auth.error_string,
 758                          pam_strerror(ctx->pamh, response->data.auth.pam_error),
 759                          response->data.auth.pam_error,
 760                          response->data.auth.nt_status_string);
 761                 return response->data.auth.pam_error;
 762         }
 763
 764         _pam_log(ctx, LOG_ERR, "request failed, but PAM error 0!");
 765
 766         return PAM_SERVICE_ERR;
 767 }
 768
 769 static int pam_winbind_request_log(struct pwb_context *ctx,
 770                                    int retval,
 771                                    const char *user)
 772 {
 773         switch (retval) {
 774         case PAM_AUTH_ERR:
 775                 /* incorrect password */
 776                 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
 777                          "(incorrect password or invalid membership)", user);
 778                 return retval;
 779         case PAM_ACCT_EXPIRED:
 780                 /* account expired */
 781                 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
 782                          user);
 783                 return retval;
 784         case PAM_AUTHTOK_EXPIRED:
 785                 /* password expired */
 786                 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
 787                          user);
 788                 return retval;
 789         case PAM_NEW_AUTHTOK_REQD:
 790                 /* new password required */
 791                 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
 792                          "required", user);
 793                 return retval;
 794         case PAM_USER_UNKNOWN:
 795                 /* the user does not exist */
 796                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
 797                                user);
 798                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
 799                         return PAM_IGNORE;
 800                 }
 801                 return retval;
 802         case PAM_SUCCESS:
 803                 /* Otherwise, the authentication looked good */
 804 #if 0
 805                 switch (req_type) {
 806                         case WINBINDD_INFO:
 807                                 break;
 808                         case WINBINDD_PAM_AUTH:
 809                                 _pam_log(ctx, LOG_NOTICE,
 810                                          "user '%s' granted access", user);
 811                                 break;
 812                         case WINBINDD_PAM_CHAUTHTOK:
 813                                 _pam_log(ctx, LOG_NOTICE,
 814                                          "user '%s' password changed", user);
 815                                 break;
 816                         default:
 817                                 _pam_log(ctx, LOG_NOTICE,
 818                                          "user '%s' OK", user);
 819                                 break;
 820                 }
 821 #endif
 822                 return retval;
 823         default:
 824                 /* we don't know anything about this return value */
 825                 _pam_log(ctx, LOG_ERR,
 826                          "internal module error (retval = %d, user = '%s')",
 827                          retval, user);
 828                 return retval;
 829         }
 830 }
 831
 832 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
 833                                        struct wbcAuthErrorInfo *e,
 834                                        wbcErr status,
 835                                        const char *username,
 836                                        const char *fn)
 837 {
 838         int ret = PAM_AUTH_ERR;
 839
 840         if (WBC_ERROR_IS_OK(status)) {
 841                 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
 842                         fn);
 843                 ret = PAM_SUCCESS;
 844                 return pam_winbind_request_log(ctx, ret, username);
 845         }
 846
 847         if (e) {
 848                 if (e->pam_error != PAM_SUCCESS) {
 849                         _pam_log(ctx, LOG_ERR,
 850                                  "request %s failed: %s, "
 851                                  "PAM error: %s (%d), NTSTATUS: %s, "
 852                                  "Error message was: %s",
 853                                  fn,
 854                                  wbcErrorString(status),
 855                                  _pam_error_code_str(e->pam_error),
 856                                  e->pam_error,
 857                                  e->nt_string,
 858                                  e->display_string);
 859                         ret = e->pam_error;
 860                         return pam_winbind_request_log(ctx, ret, username);
 861                 }
 862
 863                 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
 864
 865                 ret = PAM_SERVICE_ERR;
 866                 return pam_winbind_request_log(ctx, ret, username);
 867         }
 868
 869         ret = wbc_error_to_pam_error(status);
 870         return pam_winbind_request_log(ctx, ret, username);
 871 }
 872
 873
 874 /**
 875  * send a password expiry message if required
 876  *
 877  * @param ctx PAM winbind context.
 878  * @param next_change expected (calculated) next expiry date.
 879  * @param already_expired pointer to a boolean to indicate if the password is
 880  *        already expired.
 881  *
 882  * @return boolean Returns true if message has been sent, false if not.
 883  */
 884
 885 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
 886                                               time_t next_change,
 887                                               time_t now,
 888                                               int warn_pwd_expire,
 889                                               bool *already_expired)
 890 {
 891         int days = 0;
 892         struct tm tm_now, tm_next_change;
 893
 894         if (already_expired) {
 895                 *already_expired = false;
 896         }
 897
 898         if (next_change <= now) {
 899                 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
 900                 if (already_expired) {
 901                         *already_expired = true;
 902                 }
 903                 return true;
 904         }
 905
 906         if ((next_change < 0) ||
 907             (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
 908                 return false;
 909         }
 910
 911         if ((localtime_r(&now, &tm_now) == NULL) ||
 912             (localtime_r(&next_change, &tm_next_change) == NULL)) {
 913                 return false;
 914         }
 915
 916         days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
 917                (tm_now.tm_yday+tm_now.tm_year*365);
 918
 919         if (days == 0) {
 920                 _make_remark(ctx, PAM_TEXT_INFO,
 921                              _("Your password expires today"));
 922                 return true;
 923         }
 924
 925         if (days > 0 && days < warn_pwd_expire) {
 926                 _make_remark_format(ctx, PAM_TEXT_INFO,
 927                                     _("Your password will expire in %d %s"),
 928                                     days, (days > 1) ? _("days"):_("day"));
 929                 return true;
 930         }
 931
 932         return false;
 933 }
 934
 935 /**
 936  * Send a warning if the password expires in the near future
 937  *
 938  * @param ctx PAM winbind context.
 939  * @param response The full authentication response structure.
 940  * @param already_expired boolean, is the pwd already expired?
 941  *
 942  * @return void.
 943  */
 944
 945 static void _pam_warn_password_expiry(struct pwb_context *ctx,
 946                                       const struct winbindd_response *response,
 947                                       int warn_pwd_expire,
 948                                       bool *already_expired)
 949 {
 950         time_t now = time(NULL);
 951         time_t next_change = 0;
 952
 953         if (already_expired) {
 954                 *already_expired = false;
 955         }
 956
 957         /* accounts with ACB_PWNOEXP set never receive a warning */
 958         if (response->data.auth.info3.acct_flags & ACB_PWNOEXP) {
 959                 return;
 960         }
 961
 962         /* no point in sending a warning if this is a grace logon */
 963         if (PAM_WB_GRACE_LOGON(response->data.auth.info3.user_flgs)) {
 964                 return;
 965         }
 966
 967         /* check if the info3 must change timestamp has been set */
 968         next_change = response->data.auth.info3.pass_must_change_time;
 969
 970         if (_pam_send_password_expiry_message(ctx, next_change, now,
 971                                               warn_pwd_expire,
 972                                               already_expired)) {
 973                 return;
 974         }
 975
 976         /* now check for the global password policy */
 977         /* good catch from Ralf Haferkamp: an expiry of "never" is translated
 978          * to -1 */
 979         if (response->data.auth.policy.expire <= 0) {
 980                 return;
 981         }
 982
 983         next_change = response->data.auth.info3.pass_last_set_time +
 984                       response->data.auth.policy.expire;
 985
 986         if (_pam_send_password_expiry_message(ctx, next_change, now,
 987                                               warn_pwd_expire,
 988                                               already_expired)) {
 989                 return;
 990         }
 991
 992         /* no warning sent */
 993 }
 994
 995 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
 996
 997 /**
 998  * Append a string, making sure not to overflow and to always return a
 999  * NULL-terminated string.
1000  *
1001  * @param dest Destination string buffer (must already be NULL-terminated).
1002  * @param src Source string buffer.
1003  * @param dest_buffer_size Size of dest buffer in bytes.
1004  *
1005  * @return false if dest buffer is not big enough (no bytes copied), true on
1006  * success.
1007  */
1008
1009 static bool safe_append_string(char *dest,
1010                                const char *src,
1011                                int dest_buffer_size)
1012 {
1013         int dest_length = strlen(dest);
1014         int src_length = strlen(src);
1015
1016         if (dest_length + src_length + 1 > dest_buffer_size) {
1017                 return false;
1018         }
1019
1020         memcpy(dest + dest_length, src, src_length + 1);
1021         return true;
1022 }
1023
1024 /**
1025  * Convert a names into a SID string, appending it to a buffer.
1026  *
1027  * @param ctx PAM winbind context.
1028  * @param user User in PAM request.
1029  * @param name Name to convert.
1030  * @param sid_list_buffer Where to append the string sid.
1031  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1032  *
1033  * @return false on failure, true on success.
1034  */
1035 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
1036                                        const char *user,
1037                                        const char *name,
1038                                        char *sid_list_buffer,
1039                                        int sid_list_buffer_size)
1040 {
1041         const char* sid_string;
1042         struct winbindd_response sid_response;
1043
1044         /* lookup name? */
1045         if (IS_SID_STRING(name)) {
1046                 sid_string = name;
1047         } else {
1048                 struct winbindd_request sid_request;
1049
1050                 ZERO_STRUCT(sid_request);
1051                 ZERO_STRUCT(sid_response);
1052
1053                 _pam_log_debug(ctx, LOG_DEBUG,
1054                                "no sid given, looking up: %s\n", name);
1055
1056                 /* fortunatly winbindd can handle non-separated names */
1057                 strncpy(sid_request.data.name.name, name,
1058                         sizeof(sid_request.data.name.name) - 1);
1059
1060                 if (pam_winbind_request_log(ctx, WINBINDD_LOOKUPNAME,
1061                                             &sid_request, &sid_response,
1062                                             user)) {
1063                         _pam_log(ctx, LOG_INFO,
1064                                  "could not lookup name: %s\n", name);
1065                         return false;
1066                 }
1067
1068                 sid_string = sid_response.data.sid.sid;
1069         }
1070
1071         if (!safe_append_string(sid_list_buffer, sid_string,
1072                                 sid_list_buffer_size)) {
1073                 return false;
1074         }
1075
1076         return true;
1077 }
1078
1079 /**
1080  * Convert a list of names into a list of sids.
1081  *
1082  * @param ctx PAM winbind context.
1083  * @param user User in PAM request.
1084  * @param name_list List of names or string sids, separated by commas.
1085  * @param sid_list_buffer Where to put the list of string sids.
1086  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1087  *
1088  * @return false on failure, true on success.
1089  */
1090 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1091                                                  const char *user,
1092                                                  const char *name_list,
1093                                                  char *sid_list_buffer,
1094                                                  int sid_list_buffer_size)
1095 {
1096         bool result = false;
1097         char *current_name = NULL;
1098         const char *search_location;
1099         const char *comma;
1100
1101         if (sid_list_buffer_size > 0) {
1102                 sid_list_buffer[0] = 0;
1103         }
1104
1105         search_location = name_list;
1106         while ((comma = strstr(search_location, ",")) != NULL) {
1107                 current_name = strndup(search_location,
1108                                        comma - search_location);
1109                 if (NULL == current_name) {
1110                         goto out;
1111                 }
1112
1113                 if (!winbind_name_to_sid_string(ctx, user,
1114                                                 current_name,
1115                                                 sid_list_buffer,
1116                                                 sid_list_buffer_size)) {
1117                         goto out;
1118                 }
1119
1120                 SAFE_FREE(current_name);
1121
1122                 if (!safe_append_string(sid_list_buffer, ",",
1123                                         sid_list_buffer_size)) {
1124                         goto out;
1125                 }
1126
1127                 search_location = comma + 1;
1128         }
1129
1130         if (!winbind_name_to_sid_string(ctx, user, search_location,
1131                                         sid_list_buffer,
1132                                         sid_list_buffer_size)) {
1133                 goto out;
1134         }
1135
1136         result = true;
1137
1138 out:
1139         SAFE_FREE(current_name);
1140         return result;
1141 }
1142
1143 /**
1144  * put krb5ccname variable into environment
1145  *
1146  * @param ctx PAM winbind context.
1147  * @param krb5ccname env variable retrieved from winbindd.
1148  *
1149  * @return void.
1150  */
1151
1152 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1153                                 const char *krb5ccname)
1154 {
1155         char var[PATH_MAX];
1156         int ret;
1157
1158         if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1159                 return;
1160         }
1161
1162         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1163                 return;
1164         }
1165
1166         _pam_log_debug(ctx, LOG_DEBUG,
1167                        "request returned KRB5CCNAME: %s", krb5ccname);
1168
1169         if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
1170                 return;
1171         }
1172
1173         ret = pam_putenv(ctx->pamh, var);
1174         if (ret) {
1175                 _pam_log(ctx, LOG_ERR,
1176                          "failed to set KRB5CCNAME to %s: %s",
1177                          var, pam_strerror(ctx->pamh, ret));
1178         }
1179 }
1180
1181 /**
1182  * Set string into the PAM stack.
1183  *
1184  * @param ctx PAM winbind context.
1185  * @param data_name Key name for pam_set_data.
1186  * @param value String value.
1187  *
1188  * @return void.
1189  */
1190
1191 static void _pam_set_data_string(struct pwb_context *ctx,
1192                                  const char *data_name,
1193                                  const char *value)
1194 {
1195         int ret;
1196
1197         if (!data_name || !value || (strlen(data_name) == 0) ||
1198              (strlen(value) == 0)) {
1199                 return;
1200         }
1201
1202         ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1203                            _pam_winbind_cleanup_func);
1204         if (ret) {
1205                 _pam_log_debug(ctx, LOG_DEBUG,
1206                                "Could not set data %s: %s\n",
1207                                data_name, pam_strerror(ctx->pamh, ret));
1208         }
1209 }
1210
1211 /**
1212  * Set info3 strings into the PAM stack.
1213  *
1214  * @param ctx PAM winbind context.
1215  * @param data_name Key name for pam_set_data.
1216  * @param value String value.
1217  *
1218  * @return void.
1219  */
1220
1221 static void _pam_set_data_info3(struct pwb_context *ctx,
1222                                 struct winbindd_response *response)
1223 {
1224         _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1225                              response->data.auth.info3.home_dir);
1226         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1227                              response->data.auth.info3.logon_script);
1228         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1229                              response->data.auth.info3.logon_srv);
1230         _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1231                              response->data.auth.info3.profile_path);
1232 }
1233
1234 /**
1235  * Free info3 strings in the PAM stack.
1236  *
1237  * @param pamh PAM handle
1238  *
1239  * @return void.
1240  */
1241
1242 static void _pam_free_data_info3(pam_handle_t *pamh)
1243 {
1244         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1245         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1246         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1247         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1248 }
1249
1250 /**
1251  * Send PAM_ERROR_MSG for cached or grace logons.
1252  *
1253  * @param ctx PAM winbind context.
1254  * @param username User in PAM request.
1255  * @param info3_user_flgs Info3 flags containing logon type bits.
1256  *
1257  * @return void.
1258  */
1259
1260 static void _pam_warn_logon_type(struct pwb_context *ctx,
1261                                  const char *username,
1262                                  uint32_t info3_user_flgs)
1263 {
1264         /* inform about logon type */
1265         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1266
1267                 _make_remark(ctx, PAM_ERROR_MSG,
1268                              _("Grace login. "
1269                                "Please change your password as soon you're "
1270                                "online again"));
1271                 _pam_log_debug(ctx, LOG_DEBUG,
1272                                "User %s logged on using grace logon\n",
1273                                username);
1274
1275         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1276
1277                 _make_remark(ctx, PAM_ERROR_MSG,
1278                              _("Domain Controller unreachable, "
1279                                "using cached credentials instead. "
1280                                "Network resources may be unavailable"));
1281                 _pam_log_debug(ctx, LOG_DEBUG,
1282                                "User %s logged on using cached credentials\n",
1283                                username);
1284         }
1285 }
1286
1287 /**
1288  * Send PAM_ERROR_MSG for krb5 errors.
1289  *
1290  * @param ctx PAM winbind context.
1291  * @param username User in PAM request.
1292  * @param info3_user_flgs Info3 flags containing logon type bits.
1293  *
1294  * @return void.
1295  */
1296
1297 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1298                                    const char *username,
1299                                    uint32_t info3_user_flgs)
1300 {
1301         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1302                 _make_remark(ctx, PAM_ERROR_MSG,
1303                              _("Failed to establish your Kerberos Ticket cache "
1304                                "due time differences\n"
1305                                "with the domain controller.  "
1306                                "Please verify the system time.\n"));
1307                 _pam_log_debug(ctx, LOG_DEBUG,
1308                                "User %s: Clock skew when getting Krb5 TGT\n",
1309                                username);
1310         }
1311 }
1312
1313 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1314                                        const struct wbcAuthErrorInfo *e,
1315                                        const char *nt_status_string,
1316                                        int *pam_error)
1317 {
1318         const char *ntstatus = NULL;
1319         const char *error_string = NULL;
1320
1321         if (!e || !pam_error) {
1322                 return false;
1323         }
1324
1325         ntstatus = e->nt_string;
1326         if (!ntstatus) {
1327                 return false;
1328         }
1329
1330         if (strcasecmp(ntstatus, nt_status_string) == 0) {
1331
1332                 error_string = _get_ntstatus_error_string(nt_status_string);
1333                 if (error_string) {
1334                         _make_remark(ctx, PAM_ERROR_MSG, error_string);
1335                         *pam_error = e->pam_error;
1336                         return true;
1337                 }
1338
1339                 if (e->display_string) {
1340                         _make_remark(ctx, PAM_ERROR_MSG, e->display_string);
1341                         *pam_error = e->pam_error;
1342                         return true;
1343                 }
1344
1345                 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1346                 *pam_error = e->pam_error;
1347
1348                 return true;
1349         }
1350
1351         return false;
1352 };
1353
1354 /**
1355  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1356  *
1357  * @param response The struct winbindd_response.
1358  *
1359  * @return string (caller needs to free).
1360  */
1361 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1362                                                  struct winbindd_response *response)
1363 {
1364         char *str = NULL;
1365
1366         str = talloc_asprintf(ctx, _("Your password "));
1367         if (!str) {
1368                 goto failed;
1369         }
1370
1371         if (response->data.auth.policy.min_length_password > 0) {
1372                 str = talloc_asprintf_append(str,
1373                                _("must be at least %d characters; "),
1374                                response->data.auth.policy.min_length_password);
1375                 if (!str) {
1376                         goto failed;
1377                 }
1378         }
1379
1380         if (response->data.auth.policy.password_history > 0) {
1381                 str = talloc_asprintf_append(str,
1382                                _("cannot repeat any of your previous %d "
1383                                  "passwords; "),
1384                                response->data.auth.policy.password_history);
1385                 if (!str) {
1386                         goto failed;
1387                 }
1388         }
1389
1390         if (response->data.auth.policy.password_properties &
1391             DOMAIN_PASSWORD_COMPLEX) {
1392                 str = talloc_asprintf_append(str,
1393                                _("must contain capitals, numerals "
1394                                  "or punctuation; "
1395                                  "and cannot contain your account "
1396                                  "or full name; "));
1397                 if (!str) {
1398                         goto failed;
1399                 }
1400         }
1401
1402         str = talloc_asprintf_append(str,
1403                        _("Please type a different password. "
1404                          "Type a password which meets these requirements in "
1405                          "both text boxes."));
1406         if (!str) {
1407                 goto failed;
1408         }
1409
1410         return str;
1411
1412  failed:
1413         TALLOC_FREE(str);
1414         return NULL;
1415 }
1416
1417 /* talk to winbindd */
1418 static int winbind_auth_request(struct pwb_context *ctx,
1419                                 const char *user,
1420                                 const char *pass,
1421                                 const char *member,
1422                                 const char *cctype,
1423                                 const int warn_pwd_expire,
1424                                 struct winbindd_response *p_response,
1425                                 time_t *pwd_last_set,
1426                                 char **user_ret)
1427 {
1428         struct winbindd_request request;
1429         struct winbindd_response response;
1430         int ret;
1431         bool already_expired = false;
1432
1433         ZERO_STRUCT(request);
1434         ZERO_STRUCT(response);
1435
1436         if (pwd_last_set) {
1437                 *pwd_last_set = 0;
1438         }
1439
1440         strncpy(request.data.auth.user, user,
1441                 sizeof(request.data.auth.user)-1);
1442
1443         strncpy(request.data.auth.pass, pass,
1444                 sizeof(request.data.auth.pass)-1);
1445
1446         request.data.auth.krb5_cc_type[0] = '\0';
1447         request.data.auth.uid = -1;
1448
1449         request.flags = WBFLAG_PAM_INFO3_TEXT | WBFLAG_PAM_GET_PWD_POLICY;
1450
1451         /* Krb5 auth always has to go against the KDC of the user's realm */
1452
1453         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1454                 request.flags |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1455         }
1456
1457         if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1458                 struct passwd *pwd = NULL;
1459
1460                 pwd = getpwnam(user);
1461                 if (pwd == NULL) {
1462                         return PAM_USER_UNKNOWN;
1463                 }
1464                 request.data.auth.uid = pwd->pw_uid;
1465         }
1466
1467         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1468
1469                 _pam_log_debug(ctx, LOG_DEBUG,
1470                                "enabling krb5 login flag\n");
1471
1472                 request.flags |= WBFLAG_PAM_KRB5 |
1473                                  WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1474         }
1475
1476         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1477                 _pam_log_debug(ctx, LOG_DEBUG,
1478                                "enabling cached login flag\n");
1479                 request.flags |= WBFLAG_PAM_CACHED_LOGIN;
1480         }
1481
1482         if (user_ret) {
1483                 *user_ret = NULL;
1484                 request.flags |= WBFLAG_PAM_UNIX_NAME;
1485         }
1486
1487         if (cctype != NULL) {
1488                 strncpy(request.data.auth.krb5_cc_type, cctype,
1489                         sizeof(request.data.auth.krb5_cc_type) - 1);
1490                 _pam_log_debug(ctx, LOG_DEBUG,
1491                                "enabling request for a %s krb5 ccache\n",
1492                                cctype);
1493         }
1494
1495         request.data.auth.require_membership_of_sid[0] = '\0';
1496
1497         if (member != NULL) {
1498
1499                 if (!winbind_name_list_to_sid_string_list(ctx, user,
1500                         member,
1501                         request.data.auth.require_membership_of_sid,
1502                         sizeof(request.data.auth.require_membership_of_sid))) {
1503
1504                         _pam_log_debug(ctx, LOG_ERR,
1505                                        "failed to serialize membership of sid "
1506                                        "\"%s\"\n", member);
1507                         return PAM_AUTH_ERR;
1508                 }
1509         }
1510
1511         ret = pam_winbind_request_log(ctx, WINBINDD_PAM_AUTH,
1512                                       &request, &response, user);
1513
1514         if (pwd_last_set) {
1515                 *pwd_last_set = response.data.auth.info3.pass_last_set_time;
1516         }
1517
1518         if (p_response) {
1519                 /* We want to process the response in the caller. */
1520                 *p_response = response;
1521                 return ret;
1522         }
1523
1524         if (ret) {
1525                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1526                                                  "NT_STATUS_PASSWORD_EXPIRED");
1527                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1528                                                  "NT_STATUS_PASSWORD_MUST_CHANGE");
1529                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1530                                                  "NT_STATUS_INVALID_WORKSTATION");
1531                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1532                                                  "NT_STATUS_INVALID_LOGON_HOURS");
1533                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1534                                                  "NT_STATUS_ACCOUNT_EXPIRED");
1535                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1536                                                  "NT_STATUS_ACCOUNT_DISABLED");
1537                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1538                                                  "NT_STATUS_ACCOUNT_LOCKED_OUT");
1539                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1540                                                  "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT");
1541                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1542                                                  "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT");
1543                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1544                                                  "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT");
1545                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1546                                                  "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
1547                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1548                                                  "NT_STATUS_NO_LOGON_SERVERS");
1549                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1550                                                  "NT_STATUS_WRONG_PASSWORD");
1551                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1552                                                  "NT_STATUS_ACCESS_DENIED");
1553         }
1554
1555         if (ret == PAM_SUCCESS) {
1556
1557                 /* warn a user if the password is about to expire soon */
1558                 _pam_warn_password_expiry(ctx, &response,
1559                                           warn_pwd_expire,
1560                                           &already_expired);
1561
1562                 if (already_expired == true) {
1563                         SMB_TIME_T last_set;
1564                         last_set = response.data.auth.info3.pass_last_set_time;
1565                         _pam_log_debug(ctx, LOG_DEBUG,
1566                                        "Password has expired "
1567                                        "(Password was last set: %lld, "
1568                                        "the policy says it should expire here "
1569                                        "%lld (now it's: %lu))\n",
1570                                        (long long int)last_set,
1571                                        (long long int)last_set +
1572                                        response.data.auth.policy.expire,
1573                                        time(NULL));
1574
1575                         return PAM_AUTHTOK_EXPIRED;
1576                 }
1577
1578                 /* inform about logon type */
1579                 _pam_warn_logon_type(ctx, user,
1580                                      response.data.auth.info3.user_flgs);
1581
1582                 /* inform about krb5 failures */
1583                 _pam_warn_krb5_failure(ctx, user,
1584                                        response.data.auth.info3.user_flgs);
1585
1586                 /* set some info3 info for other modules in the stack */
1587                 _pam_set_data_info3(ctx, &response);
1588
1589                 /* put krb5ccname into env */
1590                 _pam_setup_krb5_env(ctx, response.data.auth.krb5ccname);
1591
1592                 /* If winbindd returned a username, return the pointer to it
1593                  * here. */
1594                 if (user_ret && response.data.auth.unix_username[0]) {
1595                         /* We have to trust it's a null terminated string. */
1596                         *user_ret = strndup(response.data.auth.unix_username,
1597                                     sizeof(response.data.auth.unix_username) - 1);
1598                 }
1599         }
1600
1601         return ret;
1602 }
1603
1604 /* talk to winbindd */
1605 static int winbind_chauthtok_request(struct pwb_context *ctx,
1606                                      const char *user,
1607                                      const char *oldpass,
1608                                      const char *newpass,
1609                                      time_t pwd_last_set)
1610 {
1611         struct winbindd_request request;
1612         struct winbindd_response response;
1613         int ret;
1614
1615         ZERO_STRUCT(request);
1616         ZERO_STRUCT(response);
1617
1618         if (request.data.chauthtok.user == NULL) {
1619                 return -2;
1620         }
1621
1622         strncpy(request.data.chauthtok.user, user,
1623                 sizeof(request.data.chauthtok.user) - 1);
1624
1625         if (oldpass != NULL) {
1626                 strncpy(request.data.chauthtok.oldpass, oldpass,
1627                         sizeof(request.data.chauthtok.oldpass) - 1);
1628         } else {
1629                 request.data.chauthtok.oldpass[0] = '\0';
1630         }
1631
1632         if (newpass != NULL) {
1633                 strncpy(request.data.chauthtok.newpass, newpass,
1634                         sizeof(request.data.chauthtok.newpass) - 1);
1635         } else {
1636                 request.data.chauthtok.newpass[0] = '\0';
1637         }
1638
1639         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1640                 request.flags = WBFLAG_PAM_KRB5 |
1641                                 WBFLAG_PAM_CONTACT_TRUSTDOM;
1642         }
1643
1644         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1645                 request.flags |= WBFLAG_PAM_CACHED_LOGIN;
1646         }
1647
1648         ret = pam_winbind_request_log(ctx, WINBINDD_PAM_CHAUTHTOK,
1649                                       &request, &response, user);
1650
1651         if (ret == PAM_SUCCESS) {
1652                 return ret;
1653         }
1654
1655         PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1656                                          "NT_STATUS_BACKUP_CONTROLLER");
1657         PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1658                                          "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
1659         PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1660                                          "NT_STATUS_NO_LOGON_SERVERS");
1661         PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1662                                          "NT_STATUS_ACCESS_DENIED");
1663
1664         /* TODO: tell the min pwd length ? */
1665         PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1666                                          "NT_STATUS_PWD_TOO_SHORT");
1667
1668         /* TODO: tell the minage ? */
1669         PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1670                                          "NT_STATUS_PWD_TOO_RECENT");
1671
1672         /* TODO: tell the history length ? */
1673         PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1674                                          "NT_STATUS_PWD_HISTORY_CONFLICT");
1675
1676         if (!strcasecmp(response.data.auth.nt_status_string,
1677                         "NT_STATUS_PASSWORD_RESTRICTION")) {
1678
1679                 char *pwd_restriction_string = NULL;
1680                 SMB_TIME_T min_pwd_age;
1681                 uint32_t reject_reason = response.data.auth.reject_reason;
1682                 min_pwd_age = response.data.auth.policy.min_passwordage;
1683
1684                 /* FIXME: avoid to send multiple PAM messages after another */
1685                 switch (reject_reason) {
1686                         case -1:
1687                                 break;
1688                         case SAMR_REJECT_OTHER:
1689                                 if ((min_pwd_age > 0) &&
1690                                     (pwd_last_set + min_pwd_age > time(NULL))) {
1691                                         PAM_WB_REMARK_DIRECT(ctx,
1692                                              "NT_STATUS_PWD_TOO_RECENT");
1693                                 }
1694                                 break;
1695                         case SAMR_REJECT_TOO_SHORT:
1696                                 PAM_WB_REMARK_DIRECT(ctx,
1697                                         "NT_STATUS_PWD_TOO_SHORT");
1698                                 break;
1699                         case SAMR_REJECT_IN_HISTORY:
1700                                 PAM_WB_REMARK_DIRECT(ctx,
1701                                         "NT_STATUS_PWD_HISTORY_CONFLICT");
1702                                 break;
1703                         case SAMR_REJECT_COMPLEXITY:
1704                                 _make_remark(ctx, PAM_ERROR_MSG,
1705                                              _("Password does not meet "
1706                                                "complexity requirements"));
1707                                 break;
1708                         default:
1709                                 _pam_log_debug(ctx, LOG_DEBUG,
1710                                                "unknown password change "
1711                                                "reject reason: %d",
1712                                                reject_reason);
1713                                 break;
1714                 }
1715
1716                 pwd_restriction_string =
1717                         _pam_compose_pwd_restriction_string(ctx, &response);
1718                 if (pwd_restriction_string) {
1719                         _make_remark(ctx, PAM_ERROR_MSG,
1720                                      pwd_restriction_string);
1721                         TALLOC_FREE(pwd_restriction_string);
1722                 }
1723         }
1724
1725         return ret;
1726 }
1727
1728 /*
1729  * Checks if a user has an account
1730  *
1731  * return values:
1732  *       1  = User not found
1733  *       0  = OK
1734  *      -1  = System error
1735  */
1736 static int valid_user(struct pwb_context *ctx,
1737                       const char *user)
1738 {
1739         /* check not only if the user is available over NSS calls, also make
1740          * sure it's really a winbind user, this is important when stacking PAM
1741          * modules in the 'account' or 'password' facility. */
1742
1743         wbcErr wbc_status;
1744         struct passwd *pwd = NULL;
1745         struct passwd *wb_pwd = NULL;
1746
1747         pwd = getpwnam(user);
1748         if (pwd == NULL) {
1749                 return 1;
1750         }
1751
1752         wbc_status = wbcGetpwnam(user, &wb_pwd);
1753         wbcFreeMemory(wb_pwd);
1754         if (!WBC_ERROR_IS_OK(wbc_status)) {
1755                 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
1756                         wbcErrorString(wbc_status));
1757         }
1758
1759         switch (wbc_status) {
1760                 case WBC_ERR_UNKNOWN_USER:
1761                         return 1;
1762                 case WBC_ERR_SUCCESS:
1763                         return 0;
1764                 default:
1765                         break;
1766         }
1767         return -1;
1768 }
1769
1770 static char *_pam_delete(register char *xx)
1771 {
1772         _pam_overwrite(xx);
1773         _pam_drop(xx);
1774         return NULL;
1775 }
1776
1777 /*
1778  * obtain a password from the user
1779  */
1780
1781 static int _winbind_read_password(struct pwb_context *ctx,
1782                                   unsigned int ctrl,
1783                                   const char *comment,
1784                                   const char *prompt1,
1785                                   const char *prompt2,
1786                                   const char **pass)
1787 {
1788         int authtok_flag;
1789         int retval;
1790         const char *item;
1791         char *token;
1792
1793         _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
1794
1795         /*
1796          * make sure nothing inappropriate gets returned
1797          */
1798
1799         *pass = token = NULL;
1800
1801         /*
1802          * which authentication token are we getting?
1803          */
1804
1805         if (on(WINBIND__OLD_PASSWORD, ctrl)) {
1806                 authtok_flag = PAM_OLDAUTHTOK;
1807         } else {
1808                 authtok_flag = PAM_AUTHTOK;
1809         }
1810
1811         /*
1812          * should we obtain the password from a PAM item ?
1813          */
1814
1815         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
1816             on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1817                 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
1818                 if (retval != PAM_SUCCESS) {
1819                         /* very strange. */
1820                         _pam_log(ctx, LOG_ALERT,
1821                                  "pam_get_item returned error "
1822                                  "to unix-read-password");
1823                         return retval;
1824                 } else if (item != NULL) {      /* we have a password! */
1825                         *pass = item;
1826                         item = NULL;
1827                         _pam_log(ctx, LOG_DEBUG,
1828                                  "pam_get_item returned a password");
1829                         return PAM_SUCCESS;
1830                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1831                         return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
1832                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
1833                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
1834                         return PAM_AUTHTOK_RECOVER_ERR;
1835                 }
1836         }
1837         /*
1838          * getting here implies we will have to get the password from the
1839          * user directly.
1840          */
1841
1842         {
1843                 struct pam_message msg[3], *pmsg[3];
1844                 struct pam_response *resp;
1845                 int i, replies;
1846
1847                 /* prepare to converse */
1848
1849                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
1850                         pmsg[0] = &msg[0];
1851                         msg[0].msg_style = PAM_TEXT_INFO;
1852                         msg[0].msg = discard_const_p(char, comment);
1853                         i = 1;
1854                 } else {
1855                         i = 0;
1856                 }
1857
1858                 pmsg[i] = &msg[i];
1859                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
1860                 msg[i++].msg = discard_const_p(char, prompt1);
1861                 replies = 1;
1862
1863                 if (prompt2 != NULL) {
1864                         pmsg[i] = &msg[i];
1865                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
1866                         msg[i++].msg = discard_const_p(char, prompt2);
1867                         ++replies;
1868                 }
1869                 /* so call the conversation expecting i responses */
1870                 resp = NULL;
1871                 retval = converse(ctx->pamh, i, pmsg, &resp);
1872                 if (resp == NULL) {
1873                         if (retval == PAM_SUCCESS) {
1874                                 retval = PAM_AUTHTOK_RECOVER_ERR;
1875                         }
1876                         goto done;
1877                 }
1878                 if (retval != PAM_SUCCESS) {
1879                         _pam_drop_reply(resp, i);
1880                         goto done;
1881                 }
1882
1883                 /* interpret the response */
1884
1885                 token = x_strdup(resp[i - replies].resp);
1886                 if (!token) {
1887                         _pam_log(ctx, LOG_NOTICE,
1888                                  "could not recover "
1889                                  "authentication token");
1890                         retval = PAM_AUTHTOK_RECOVER_ERR;
1891                         goto done;
1892                 }
1893
1894                 if (replies == 2) {
1895                         /* verify that password entered correctly */
1896                         if (!resp[i - 1].resp ||
1897                             strcmp(token, resp[i - 1].resp)) {
1898                                 _pam_delete(token);     /* mistyped */
1899                                 retval = PAM_AUTHTOK_RECOVER_ERR;
1900                                 _make_remark(ctx, PAM_ERROR_MSG,
1901                                              MISTYPED_PASS);
1902                         }
1903                 }
1904
1905                 /*
1906                  * tidy up the conversation (resp_retcode) is ignored
1907                  * -- what is it for anyway? AGM
1908                  */
1909                 _pam_drop_reply(resp, i);
1910         }
1911
1912  done:
1913         if (retval != PAM_SUCCESS) {
1914                 _pam_log_debug(ctx, LOG_DEBUG,
1915                                "unable to obtain a password");
1916                 return retval;
1917         }
1918         /* 'token' is the entered password */
1919
1920         /* we store this password as an item */
1921
1922         retval = pam_set_item(ctx->pamh, authtok_flag, token);
1923         _pam_delete(token);     /* clean it up */
1924         if (retval != PAM_SUCCESS ||
1925             (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
1926
1927                 _pam_log(ctx, LOG_CRIT, "error manipulating password");
1928                 return retval;
1929
1930         }
1931
1932         *pass = item;
1933         item = NULL;            /* break link to password */
1934
1935         return PAM_SUCCESS;
1936 }
1937
1938 static const char *get_conf_item_string(struct pwb_context *ctx,
1939                                         const char *item,
1940                                         int config_flag)
1941 {
1942         int i = 0;
1943         const char *parm_opt = NULL;
1944
1945         if (!(ctx->ctrl & config_flag)) {
1946                 goto out;
1947         }
1948
1949         /* let the pam opt take precedence over the pam_winbind.conf option */
1950         for (i=0; i<ctx->argc; i++) {
1951
1952                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
1953                         char *p;
1954
1955                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
1956                                 _pam_log(ctx, LOG_INFO,
1957                                          "no \"=\" delimiter for \"%s\" found\n",
1958                                          item);
1959                                 goto out;
1960                         }
1961                         _pam_log_debug(ctx, LOG_INFO,
1962                                        "PAM config: %s '%s'\n", item, p+1);
1963                         return p + 1;
1964                 }
1965         }
1966
1967         if (ctx->dict) {
1968                 char *key = NULL;
1969
1970                 key = talloc_asprintf(ctx, "global:%s", item);
1971                 if (!key) {
1972                         goto out;
1973                 }
1974
1975                 parm_opt = iniparser_getstr(ctx->dict, key);
1976                 TALLOC_FREE(key);
1977
1978                 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
1979                                item, parm_opt);
1980         }
1981 out:
1982         return parm_opt;
1983 }
1984
1985 static int get_config_item_int(struct pwb_context *ctx,
1986                                const char *item,
1987                                int config_flag)
1988 {
1989         int i, parm_opt = -1;
1990
1991         if (!(ctx->ctrl & config_flag)) {
1992                 goto out;
1993         }
1994
1995         /* let the pam opt take precedence over the pam_winbind.conf option */
1996         for (i = 0; i < ctx->argc; i++) {
1997
1998                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
1999                         char *p;
2000
2001                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2002                                 _pam_log(ctx, LOG_INFO,
2003                                          "no \"=\" delimiter for \"%s\" found\n",
2004                                          item);
2005                                 goto out;
2006                         }
2007                         parm_opt = atoi(p + 1);
2008                         _pam_log_debug(ctx, LOG_INFO,
2009                                        "PAM config: %s '%d'\n",
2010                                        item, parm_opt);
2011                         return parm_opt;
2012                 }
2013         }
2014
2015         if (ctx->dict) {
2016                 char *key = NULL;
2017
2018                 key = talloc_asprintf(ctx, "global:%s", item);
2019                 if (!key) {
2020                         goto out;
2021                 }
2022
2023                 parm_opt = iniparser_getint(ctx->dict, key, -1);
2024                 TALLOC_FREE(key);
2025
2026                 _pam_log_debug(ctx, LOG_INFO,
2027                                "CONFIG file: %s '%d'\n",
2028                                item, parm_opt);
2029         }
2030 out:
2031         return parm_opt;
2032 }
2033
2034 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2035 {
2036         return get_conf_item_string(ctx, "krb5_ccache_type",
2037                                     WINBIND_KRB5_CCACHE_TYPE);
2038 }
2039
2040 static const char *get_member_from_config(struct pwb_context *ctx)
2041 {
2042         const char *ret = NULL;
2043         ret = get_conf_item_string(ctx, "require_membership_of",
2044                                    WINBIND_REQUIRED_MEMBERSHIP);
2045         if (ret) {
2046                 return ret;
2047         }
2048         return get_conf_item_string(ctx, "require-membership-of",
2049                                     WINBIND_REQUIRED_MEMBERSHIP);
2050 }
2051
2052 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2053 {
2054         int ret;
2055         ret = get_config_item_int(ctx, "warn_pwd_expire",
2056                                   WINBIND_WARN_PWD_EXPIRE);
2057         /* no or broken setting */
2058         if (ret <= 0) {
2059                 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2060         }
2061         return ret;
2062 }
2063
2064 /**
2065  * Retrieve the winbind separator.
2066  *
2067  * @param ctx PAM winbind context.
2068  *
2069  * @return string separator character. NULL on failure.
2070  */
2071
2072 static char winbind_get_separator(struct pwb_context *ctx)
2073 {
2074         struct winbindd_request request;
2075         struct winbindd_response response;
2076
2077         ZERO_STRUCT(request);
2078         ZERO_STRUCT(response);
2079
2080         if (pam_winbind_request_log(ctx, WINBINDD_INFO,
2081                                     &request, &response, NULL)) {
2082                 return '\0';
2083         }
2084
2085         return response.data.info.winbind_separator;
2086 }
2087
2088 /**
2089  * Convert a upn to a name.
2090  *
2091  * @param ctx PAM winbind context.
2092  * @param upn  USer UPN to be trabslated.
2093  *
2094  * @return converted name. NULL pointer on failure. Caller needs to free.
2095  */
2096
2097 static char* winbind_upn_to_username(struct pwb_context *ctx,
2098                                      const char *upn)
2099 {
2100         struct winbindd_request req;
2101         struct winbindd_response resp;
2102         int retval;
2103         char sep;
2104
2105         /* This cannot work when the winbind separator = @ */
2106
2107         sep = winbind_get_separator(ctx);
2108         if (!sep || sep == '@') {
2109                 return NULL;
2110         }
2111
2112         /* Convert the UPN to a SID */
2113
2114         ZERO_STRUCT(req);
2115         ZERO_STRUCT(resp);
2116
2117         strncpy(req.data.name.dom_name, "",
2118                 sizeof(req.data.name.dom_name) - 1);
2119         strncpy(req.data.name.name, upn,
2120                 sizeof(req.data.name.name) - 1);
2121         retval = pam_winbind_request_log(ctx, WINBINDD_LOOKUPNAME,
2122                                          &req, &resp, upn);
2123         if (retval != PAM_SUCCESS) {
2124                 return NULL;
2125         }
2126
2127         /* Convert the the SID back to the sAMAccountName */
2128
2129         ZERO_STRUCT(req);
2130         strncpy(req.data.sid, resp.data.sid.sid, sizeof(req.data.sid)-1);
2131         ZERO_STRUCT(resp);
2132         retval =  pam_winbind_request_log(ctx, WINBINDD_LOOKUPSID,
2133                                           &req, &resp, upn);
2134         if (retval != PAM_SUCCESS) {
2135                 return NULL;
2136         }
2137
2138         return talloc_asprintf(ctx, "%s\\%s",
2139                                resp.data.name.dom_name,
2140                                resp.data.name.name);
2141 }
2142
2143 PAM_EXTERN
2144 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2145                         int argc, const char **argv)
2146 {
2147         const char *username;
2148         const char *password;
2149         const char *member = NULL;
2150         const char *cctype = NULL;
2151         int warn_pwd_expire;
2152         int retval = PAM_AUTH_ERR;
2153         char *username_ret = NULL;
2154         char *new_authtok_required = NULL;
2155         char *real_username = NULL;
2156         struct pwb_context *ctx = NULL;
2157
2158         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2159         if (retval) {
2160                 goto out;
2161         }
2162
2163         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2164
2165         /* Get the username */
2166         retval = pam_get_user(pamh, &username, NULL);
2167         if ((retval != PAM_SUCCESS) || (!username)) {
2168                 _pam_log_debug(ctx, LOG_DEBUG,
2169                                "can not get the username");
2170                 retval = PAM_SERVICE_ERR;
2171                 goto out;
2172         }
2173
2174
2175 #if defined(AIX)
2176         /* Decode the user name since AIX does not support logn user
2177            names by default.  The name is encoded as _#uid.  */
2178
2179         if (username[0] == '_') {
2180                 uid_t id = atoi(&username[1]);
2181                 struct passwd *pw = NULL;
2182
2183                 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2184                         real_username = strdup(pw->pw_name);
2185                 }
2186         }
2187 #endif
2188
2189         if (!real_username) {
2190                 /* Just making a copy of the username we got from PAM */
2191                 if ((real_username = strdup(username)) == NULL) {
2192                         _pam_log_debug(ctx, LOG_DEBUG,
2193                                        "memory allocation failure when copying "
2194                                        "username");
2195                         retval = PAM_SERVICE_ERR;
2196                         goto out;
2197                 }
2198         }
2199
2200         /* Maybe this was a UPN */
2201
2202         if (strchr(real_username, '@') != NULL) {
2203                 char *samaccountname = NULL;
2204
2205                 samaccountname = winbind_upn_to_username(ctx,
2206                                                          real_username);
2207                 if (samaccountname) {
2208                         free(real_username);
2209                         real_username = strdup(samaccountname);
2210                 }
2211         }
2212
2213         retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2214                                         _("Password: "), NULL,
2215                                         &password);
2216
2217         if (retval != PAM_SUCCESS) {
2218                 _pam_log(ctx, LOG_ERR,
2219                          "Could not retrieve user's password");
2220                 retval = PAM_AUTHTOK_ERR;
2221                 goto out;
2222         }
2223
2224         /* Let's not give too much away in the log file */
2225
2226 #ifdef DEBUG_PASSWORD
2227         _pam_log_debug(ctx, LOG_INFO,
2228                        "Verify user '%s' with password '%s'",
2229                        real_username, password);
2230 #else
2231         _pam_log_debug(ctx, LOG_INFO,
2232                        "Verify user '%s'", real_username);
2233 #endif
2234
2235         member = get_member_from_config(ctx);
2236         cctype = get_krb5_cc_type_from_config(ctx);
2237         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2238
2239         /* Now use the username to look up password */
2240         retval = winbind_auth_request(ctx, real_username, password,
2241                                       member, cctype, warn_pwd_expire, NULL,
2242                                       NULL, &username_ret);
2243
2244         if (retval == PAM_NEW_AUTHTOK_REQD ||
2245             retval == PAM_AUTHTOK_EXPIRED) {
2246
2247                 char *new_authtok_required_during_auth = NULL;
2248
2249                 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2250                 if (!new_authtok_required) {
2251                         retval = PAM_BUF_ERR;
2252                         goto out;
2253                 }
2254
2255                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2256                              new_authtok_required,
2257                              _pam_winbind_cleanup_func);
2258
2259                 retval = PAM_SUCCESS;
2260
2261                 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2262                 if (!new_authtok_required_during_auth) {
2263                         retval = PAM_BUF_ERR;
2264                         goto out;
2265                 }
2266
2267                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2268                              new_authtok_required_during_auth,
2269                              _pam_winbind_cleanup_func);
2270
2271                 goto out;
2272         }
2273
2274 out:
2275         if (username_ret) {
2276                 pam_set_item (pamh, PAM_USER, username_ret);
2277                 _pam_log_debug(ctx, LOG_INFO,
2278                                "Returned user was '%s'", username_ret);
2279                 free(username_ret);
2280         }
2281
2282         if (real_username) {
2283                 free(real_username);
2284         }
2285
2286         if (!new_authtok_required) {
2287                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2288         }
2289
2290         if (retval != PAM_SUCCESS) {
2291                 _pam_free_data_info3(pamh);
2292         }
2293
2294         _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2295
2296         TALLOC_FREE(ctx);
2297
2298         return retval;
2299 }
2300
2301 PAM_EXTERN
2302 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2303                    int argc, const char **argv)
2304 {
2305         int ret = PAM_SYSTEM_ERR;
2306         struct pwb_context *ctx = NULL;
2307
2308         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2309         if (ret) {
2310                 goto out;
2311         }
2312
2313         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2314
2315         switch (flags & ~PAM_SILENT) {
2316
2317                 case PAM_DELETE_CRED:
2318                         ret = pam_sm_close_session(pamh, flags, argc, argv);
2319                         break;
2320                 case PAM_REFRESH_CRED:
2321                         _pam_log_debug(ctx, LOG_WARNING,
2322                                        "PAM_REFRESH_CRED not implemented");
2323                         ret = PAM_SUCCESS;
2324                         break;
2325                 case PAM_REINITIALIZE_CRED:
2326                         _pam_log_debug(ctx, LOG_WARNING,
2327                                        "PAM_REINITIALIZE_CRED not implemented");
2328                         ret = PAM_SUCCESS;
2329                         break;
2330                 case PAM_ESTABLISH_CRED:
2331                         _pam_log_debug(ctx, LOG_WARNING,
2332                                        "PAM_ESTABLISH_CRED not implemented");
2333                         ret = PAM_SUCCESS;
2334                         break;
2335                 default:
2336                         ret = PAM_SYSTEM_ERR;
2337                         break;
2338         }
2339
2340  out:
2341
2342         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2343
2344         TALLOC_FREE(ctx);
2345
2346         return ret;
2347 }
2348
2349 /*
2350  * Account management. We want to verify that the account exists
2351  * before returning PAM_SUCCESS
2352  */
2353 PAM_EXTERN
2354 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2355                    int argc, const char **argv)
2356 {
2357         const char *username;
2358         int ret = PAM_USER_UNKNOWN;
2359         void *tmp = NULL;
2360         struct pwb_context *ctx = NULL;
2361
2362         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2363         if (ret) {
2364                 goto out;
2365         }
2366
2367         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2368
2369
2370         /* Get the username */
2371         ret = pam_get_user(pamh, &username, NULL);
2372         if ((ret != PAM_SUCCESS) || (!username)) {
2373                 _pam_log_debug(ctx, LOG_DEBUG,
2374                                "can not get the username");
2375                 ret = PAM_SERVICE_ERR;
2376                 goto out;
2377         }
2378
2379         /* Verify the username */
2380         ret = valid_user(ctx, username);
2381         switch (ret) {
2382         case -1:
2383                 /* some sort of system error. The log was already printed */
2384                 ret = PAM_SERVICE_ERR;
2385                 goto out;
2386         case 1:
2387                 /* the user does not exist */
2388                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2389                                username);
2390                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2391                         ret = PAM_IGNORE;
2392                         goto out;
2393                 }
2394                 ret = PAM_USER_UNKNOWN;
2395                 goto out;
2396         case 0:
2397                 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2398                              (const void **)&tmp);
2399                 if (tmp != NULL) {
2400                         ret = atoi((const char *)tmp);
2401                         switch (ret) {
2402                         case PAM_AUTHTOK_EXPIRED:
2403                                 /* fall through, since new token is required in this case */
2404                         case PAM_NEW_AUTHTOK_REQD:
2405                                 _pam_log(ctx, LOG_WARNING,
2406                                          "pam_sm_acct_mgmt success but %s is set",
2407                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
2408                                 _pam_log(ctx, LOG_NOTICE,
2409                                          "user '%s' needs new password",
2410                                          username);
2411                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2412                                 ret = PAM_NEW_AUTHTOK_REQD;
2413                                 goto out;
2414                         default:
2415                                 _pam_log(ctx, LOG_WARNING,
2416                                          "pam_sm_acct_mgmt success");
2417                                 _pam_log(ctx, LOG_NOTICE,
2418                                          "user '%s' granted access", username);
2419                                 ret = PAM_SUCCESS;
2420                                 goto out;
2421                         }
2422                 }
2423
2424                 /* Otherwise, the authentication looked good */
2425                 _pam_log(ctx, LOG_NOTICE,
2426                          "user '%s' granted access", username);
2427                 ret = PAM_SUCCESS;
2428                 goto out;
2429         default:
2430                 /* we don't know anything about this return value */
2431                 _pam_log(ctx, LOG_ERR,
2432                          "internal module error (ret = %d, user = '%s')",
2433                          ret, username);
2434                 ret = PAM_SERVICE_ERR;
2435                 goto out;
2436         }
2437
2438         /* should not be reached */
2439         ret = PAM_IGNORE;
2440
2441  out:
2442
2443         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2444
2445         TALLOC_FREE(ctx);
2446
2447         return ret;
2448 }
2449
2450 PAM_EXTERN
2451 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2452                         int argc, const char **argv)
2453 {
2454         int ret = PAM_SYSTEM_ERR;
2455         struct pwb_context *ctx = NULL;
2456
2457         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2458         if (ret) {
2459                 goto out;
2460         }
2461
2462         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2463
2464         ret = PAM_SUCCESS;
2465
2466  out:
2467         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2468
2469         TALLOC_FREE(ctx);
2470
2471         return ret;
2472 }
2473
2474 PAM_EXTERN
2475 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2476                          int argc, const char **argv)
2477 {
2478         int retval = PAM_SUCCESS;
2479         struct pwb_context *ctx = NULL;
2480
2481         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2482         if (retval) {
2483                 goto out;
2484         }
2485
2486         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2487
2488         if (!(flags & PAM_DELETE_CRED)) {
2489                 retval = PAM_SUCCESS;
2490                 goto out;
2491         }
2492
2493         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2494
2495                 /* destroy the ccache here */
2496                 struct winbindd_request request;
2497                 struct winbindd_response response;
2498                 const char *user;
2499                 const char *ccname = NULL;
2500                 struct passwd *pwd = NULL;
2501
2502                 ZERO_STRUCT(request);
2503                 ZERO_STRUCT(response);
2504
2505                 retval = pam_get_user(pamh, &user, _("Username: "));
2506                 if (retval) {
2507                         _pam_log(ctx, LOG_ERR,
2508                                  "could not identify user");
2509                         goto out;
2510                 }
2511
2512                 if (user == NULL) {
2513                         _pam_log(ctx, LOG_ERR,
2514                                  "username was NULL!");
2515                         retval = PAM_USER_UNKNOWN;
2516                         goto out;
2517                 }
2518
2519                 _pam_log_debug(ctx, LOG_DEBUG,
2520                                "username [%s] obtained", user);
2521
2522                 ccname = pam_getenv(pamh, "KRB5CCNAME");
2523                 if (ccname == NULL) {
2524                         _pam_log_debug(ctx, LOG_DEBUG,
2525                                        "user has no KRB5CCNAME environment");
2526                 }
2527
2528                 strncpy(request.data.logoff.user, user,
2529                         sizeof(request.data.logoff.user) - 1);
2530
2531                 if (ccname) {
2532                         strncpy(request.data.logoff.krb5ccname, ccname,
2533                                 sizeof(request.data.logoff.krb5ccname) - 1);
2534                 }
2535
2536                 pwd = getpwnam(user);
2537                 if (pwd == NULL) {
2538                         retval = PAM_USER_UNKNOWN;
2539                         goto out;
2540                 }
2541                 request.data.logoff.uid = pwd->pw_uid;
2542
2543                 request.flags = WBFLAG_PAM_KRB5 |
2544                                 WBFLAG_PAM_CONTACT_TRUSTDOM;
2545
2546                 retval = pam_winbind_request_log(ctx,
2547                                                  WINBINDD_PAM_LOGOFF,
2548                                                  &request, &response, user);
2549         }
2550
2551 out:
2552         /*
2553          * Delete the krb5 ccname variable from the PAM environment
2554          * if it was set by winbind.
2555          */
2556         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2557                 pam_putenv(pamh, "KRB5CCNAME");
2558         }
2559
2560         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, retval);
2561
2562         TALLOC_FREE(ctx);
2563
2564         return retval;
2565 }
2566
2567 /**
2568  * evaluate whether we need to re-authenticate with kerberos after a
2569  * password change
2570  *
2571  * @param ctx PAM winbind context.
2572  * @param user The username
2573  *
2574  * @return boolean Returns true if required, false if not.
2575  */
2576
2577 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2578                                                    const char *user)
2579 {
2580
2581         /* Make sure that we only do this if a) the chauthtok got initiated
2582          * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2583          * later password change via the "passwd" command if done by the user
2584          * itself
2585          * NB. If we login from gdm or xdm and the password expires,
2586          * we change the password, but there is no memory cache.
2587          * Thus, even for passthrough login, we should do the
2588          * authentication again to update memory cache.
2589          * --- BoYang
2590          * */
2591
2592         char *new_authtok_reqd_during_auth = NULL;
2593         struct passwd *pwd = NULL;
2594
2595         _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2596                       &new_authtok_reqd_during_auth);
2597         pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2598                      NULL, NULL);
2599
2600         if (new_authtok_reqd_during_auth) {
2601                 return true;
2602         }
2603
2604         pwd = getpwnam(user);
2605         if (!pwd) {
2606                 return false;
2607         }
2608
2609         if (getuid() == pwd->pw_uid) {
2610                 return true;
2611         }
2612
2613         return false;
2614 }
2615
2616
2617 PAM_EXTERN
2618 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2619                      int argc, const char **argv)
2620 {
2621         unsigned int lctrl;
2622         int ret;
2623         bool cached_login = false;
2624
2625         /* <DO NOT free() THESE> */
2626         const char *user;
2627         char *pass_old, *pass_new;
2628         /* </DO NOT free() THESE> */
2629
2630         char *Announce;
2631
2632         int retry = 0;
2633         char *username_ret = NULL;
2634         struct winbindd_response response;
2635         struct pwb_context *ctx = NULL;
2636
2637         ZERO_STRUCT(response);
2638
2639         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2640         if (ret) {
2641                 goto out;
2642         }
2643
2644         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
2645
2646         cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
2647
2648         /* clearing offline bit for auth */
2649         ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
2650
2651         /*
2652          * First get the name of a user
2653          */
2654         ret = pam_get_user(pamh, &user, _("Username: "));
2655         if (ret) {
2656                 _pam_log(ctx, LOG_ERR,
2657                          "password - could not identify user");
2658                 goto out;
2659         }
2660
2661         if (user == NULL) {
2662                 _pam_log(ctx, LOG_ERR, "username was NULL!");
2663                 ret = PAM_USER_UNKNOWN;
2664                 goto out;
2665         }
2666
2667         _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
2668
2669         /* check if this is really a user in winbindd, not only in NSS */
2670         ret = valid_user(ctx, user);
2671         switch (ret) {
2672                 case 1:
2673                         ret = PAM_USER_UNKNOWN;
2674                         goto out;
2675                 case -1:
2676                         ret = PAM_SYSTEM_ERR;
2677                         goto out;
2678                 default:
2679                         break;
2680         }
2681
2682         /*
2683          * obtain and verify the current password (OLDAUTHTOK) for
2684          * the user.
2685          */
2686
2687         if (flags & PAM_PRELIM_CHECK) {
2688                 time_t pwdlastset_prelim = 0;
2689
2690                 /* instruct user what is happening */
2691 #define greeting _("Changing password for ")
2692                 Announce = (char *) malloc(sizeof(greeting) + strlen(user));
2693                 if (Announce == NULL) {
2694                         _pam_log(ctx, LOG_CRIT,
2695                                  "password - out of memory");
2696                         ret = PAM_BUF_ERR;
2697                         goto out;
2698                 }
2699                 (void) strcpy(Announce, greeting);
2700                 (void) strcpy(Announce + sizeof(greeting) - 1, user);
2701 #undef greeting
2702
2703                 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
2704                 ret = _winbind_read_password(ctx, lctrl,
2705                                                 Announce,
2706                                                 _("(current) NT password: "),
2707                                                 NULL,
2708                                                 (const char **) &pass_old);
2709                 TALLOC_FREE(Announce);
2710                 if (ret != PAM_SUCCESS) {
2711                         _pam_log(ctx, LOG_NOTICE,
2712                                  "password - (old) token not obtained");
2713                         goto out;
2714                 }
2715
2716                 /* verify that this is the password for this user */
2717
2718                 ret = winbind_auth_request(ctx, user, pass_old,
2719                                            NULL, NULL, 0, &response,
2720                                            &pwdlastset_prelim, NULL);
2721
2722                 if (ret != PAM_ACCT_EXPIRED &&
2723                     ret != PAM_AUTHTOK_EXPIRED &&
2724                     ret != PAM_NEW_AUTHTOK_REQD &&
2725                     ret != PAM_SUCCESS) {
2726                         pass_old = NULL;
2727                         goto out;
2728                 }
2729
2730                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
2731                              (void *)pwdlastset_prelim, NULL);
2732
2733                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
2734                                    (const void *) pass_old);
2735                 pass_old = NULL;
2736                 if (ret != PAM_SUCCESS) {
2737                         _pam_log(ctx, LOG_CRIT,
2738                                  "failed to set PAM_OLDAUTHTOK");
2739                 }
2740         } else if (flags & PAM_UPDATE_AUTHTOK) {
2741
2742                 time_t pwdlastset_update = 0;
2743
2744                 /*
2745                  * obtain the proposed password
2746                  */
2747
2748                 /*
2749                  * get the old token back.
2750                  */
2751
2752                 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
2753
2754                 if (ret != PAM_SUCCESS) {
2755                         _pam_log(ctx, LOG_NOTICE,
2756                                  "user not authenticated");
2757                         goto out;
2758                 }
2759
2760                 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
2761
2762                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
2763                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
2764                 }
2765                 retry = 0;
2766                 ret = PAM_AUTHTOK_ERR;
2767                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
2768                         /*
2769                          * use_authtok is to force the use of a previously entered
2770                          * password -- needed for pluggable password strength checking
2771                          */
2772
2773                         ret = _winbind_read_password(ctx, lctrl,
2774                                                      NULL,
2775                                                      _("Enter new NT password: "),
2776                                                      _("Retype new NT password: "),
2777                                                      (const char **)&pass_new);
2778
2779                         if (ret != PAM_SUCCESS) {
2780                                 _pam_log_debug(ctx, LOG_ALERT,
2781                                                "password - "
2782                                                "new password not obtained");
2783                                 pass_old = NULL;/* tidy up */
2784                                 goto out;
2785                         }
2786
2787                         /*
2788                          * At this point we know who the user is and what they
2789                          * propose as their new password. Verify that the new
2790                          * password is acceptable.
2791                          */
2792
2793                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
2794                                 pass_new = NULL;
2795                         }
2796                 }
2797
2798                 /*
2799                  * By reaching here we have approved the passwords and must now
2800                  * rebuild the password database file.
2801                  */
2802                 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
2803                               &pwdlastset_update);
2804
2805                 /*
2806                  * if cached creds were enabled, make sure to set the
2807                  * WINBIND_CACHED_LOGIN bit here in order to have winbindd
2808                  * update the cached creds storage - gd
2809                  */
2810                 if (cached_login) {
2811                         ctx->ctrl |= WINBIND_CACHED_LOGIN;
2812                 }
2813
2814                 ret = winbind_chauthtok_request(ctx, user, pass_old,
2815                                                 pass_new, pwdlastset_update);
2816                 if (ret) {
2817                         _pam_overwrite(pass_new);
2818                         _pam_overwrite(pass_old);
2819                         pass_old = pass_new = NULL;
2820                         goto out;
2821                 }
2822
2823                 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
2824
2825                         const char *member = NULL;
2826                         const char *cctype = NULL;
2827                         int warn_pwd_expire;
2828
2829                         member = get_member_from_config(ctx);
2830                         cctype = get_krb5_cc_type_from_config(ctx);
2831                         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2832
2833                         /* Keep WINBIND_CACHED_LOGIN bit for
2834                          * authentication after changing the password.
2835                          * This will update the cached credentials in case
2836                          * that winbindd_dual_pam_chauthtok() fails
2837                          * to update them.
2838                          * --- BoYang
2839                          * */
2840
2841                         ret = winbind_auth_request(ctx, user, pass_new,
2842                                                    member, cctype, 0, &response,
2843                                                    NULL, &username_ret);
2844                         _pam_overwrite(pass_new);
2845                         _pam_overwrite(pass_old);
2846                         pass_old = pass_new = NULL;
2847
2848                         if (ret == PAM_SUCCESS) {
2849
2850                                 /* warn a user if the password is about to
2851                                  * expire soon */
2852                                 _pam_warn_password_expiry(ctx, &response,
2853                                                           warn_pwd_expire,
2854                                                           NULL);
2855
2856                                 /* set some info3 info for other modules in the
2857                                  * stack */
2858                                 _pam_set_data_info3(ctx, &response);
2859
2860                                 /* put krb5ccname into env */
2861                                 _pam_setup_krb5_env(ctx,
2862                                                     response.data.auth.krb5ccname);
2863
2864                                 if (username_ret) {
2865                                         pam_set_item(pamh, PAM_USER,
2866                                                      username_ret);
2867                                         _pam_log_debug(ctx, LOG_INFO,
2868                                                        "Returned user was '%s'",
2869                                                        username_ret);
2870                                         free(username_ret);
2871                                 }
2872                         }
2873
2874                         goto out;
2875                 }
2876         } else {
2877                 ret = PAM_SERVICE_ERR;
2878         }
2879
2880 out:
2881
2882         /* Deal with offline errors. */
2883         PAM_WB_REMARK_CHECK_RESPONSE(ctx, response,
2884                                      "NT_STATUS_NO_LOGON_SERVERS");
2885         PAM_WB_REMARK_CHECK_RESPONSE(ctx, response,
2886                                      "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
2887         PAM_WB_REMARK_CHECK_RESPONSE(ctx, response,
2888                                      "NT_STATUS_ACCESS_DENIED");
2889
2890         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
2891
2892         TALLOC_FREE(ctx);
2893
2894         return ret;
2895 }
2896
2897 #ifdef PAM_STATIC
2898
2899 /* static module data */
2900
2901 struct pam_module _pam_winbind_modstruct = {
2902         MODULE_NAME,
2903         pam_sm_authenticate,
2904         pam_sm_setcred,
2905         pam_sm_acct_mgmt,
2906         pam_sm_open_session,
2907         pam_sm_close_session,
2908         pam_sm_chauthtok
2909 };
2910
2911 #endif
2912
2913 /*
2914  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
2915  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
2916  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
2917  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2008
2918  * Copyright (c) Jan Rêkorajski 1999.
2919  * Copyright (c) Andrew G. Morgan 1996-8.
2920  * Copyright (c) Alex O. Yuriev, 1996.
2921  * Copyright (c) Cristian Gafton 1996.
2922  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
2923  *
2924  * Redistribution and use in source and binary forms, with or without
2925  * modification, are permitted provided that the following conditions
2926  * are met:
2927  * 1. Redistributions of source code must retain the above copyright
2928  *    notice, and the entire permission notice in its entirety,
2929  *    including the disclaimer of warranties.
2930  * 2. Redistributions in binary form must reproduce the above copyright
2931  *    notice, this list of conditions and the following disclaimer in the
2932  *    documentation and/or other materials provided with the distribution.
2933  * 3. The name of the author may not be used to endorse or promote
2934  *    products derived from this software without specific prior
2935  *    written permission.
2936  *
2937  * ALTERNATIVELY, this product may be distributed under the terms of
2938  * the GNU Public License, in which case the provisions of the GPL are
2939  * required INSTEAD OF the above restrictions.  (This clause is
2940  * necessary due to a potential bad interaction between the GPL and
2941  * the restrictions contained in a BSD-style copyright.)
2942  *
2943  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
2944  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
2945  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
2946  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
2947  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
2948  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
2949  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2950  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
2951  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
2952  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
2953  * OF THE POSSIBILITY OF SUCH DAMAGE.
2954  */