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         if (response->data.auth.pam_error != PAM_SUCCESS) {
 738                 _pam_log(ctx, LOG_ERR,
 739                          "request failed: %s, "
 740                          "PAM error was %s (%d), NT error was %s",
 741                          response->data.auth.error_string,
 742                          pam_strerror(ctx->pamh, response->data.auth.pam_error),
 743                          response->data.auth.pam_error,
 744                          response->data.auth.nt_status_string);
 745                 return response->data.auth.pam_error;
 746         }
 747
 748         _pam_log(ctx, LOG_ERR, "request failed, but PAM error 0!");
 749
 750         return PAM_SERVICE_ERR;
 751 }
 752
 753 static int pam_winbind_request_log(struct pwb_context *ctx,
 754                                    int retval,
 755                                    const char *user)
 756 {
 757         switch (retval) {
 758         case PAM_AUTH_ERR:
 759                 /* incorrect password */
 760                 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
 761                          "(incorrect password or invalid membership)", user);
 762                 return retval;
 763         case PAM_ACCT_EXPIRED:
 764                 /* account expired */
 765                 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
 766                          user);
 767                 return retval;
 768         case PAM_AUTHTOK_EXPIRED:
 769                 /* password expired */
 770                 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
 771                          user);
 772                 return retval;
 773         case PAM_NEW_AUTHTOK_REQD:
 774                 /* new password required */
 775                 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
 776                          "required", user);
 777                 return retval;
 778         case PAM_USER_UNKNOWN:
 779                 /* the user does not exist */
 780                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
 781                                user);
 782                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
 783                         return PAM_IGNORE;
 784                 }
 785                 return retval;
 786         case PAM_SUCCESS:
 787                 /* Otherwise, the authentication looked good */
 788 #if 0
 789                 switch (req_type) {
 790                         case WINBINDD_PAM_AUTH:
 791                                 _pam_log(ctx, LOG_NOTICE,
 792                                          "user '%s' granted access", user);
 793                                 break;
 794                         case WINBINDD_PAM_CHAUTHTOK:
 795                                 _pam_log(ctx, LOG_NOTICE,
 796                                          "user '%s' password changed", user);
 797                                 break;
 798                         default:
 799                                 _pam_log(ctx, LOG_NOTICE,
 800                                          "user '%s' OK", user);
 801                                 break;
 802                 }
 803 #endif
 804                 return retval;
 805         default:
 806                 /* we don't know anything about this return value */
 807                 _pam_log(ctx, LOG_ERR,
 808                          "internal module error (retval = %d, user = '%s')",
 809                          retval, user);
 810                 return retval;
 811         }
 812 }
 813
 814 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
 815                                        struct wbcAuthErrorInfo *e,
 816                                        wbcErr status,
 817                                        const char *username,
 818                                        const char *fn)
 819 {
 820         int ret = PAM_AUTH_ERR;
 821
 822         if (WBC_ERROR_IS_OK(status)) {
 823                 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
 824                         fn);
 825                 ret = PAM_SUCCESS;
 826                 return pam_winbind_request_log(ctx, ret, username);
 827         }
 828
 829         if (e) {
 830                 if (e->pam_error != PAM_SUCCESS) {
 831                         _pam_log(ctx, LOG_ERR,
 832                                  "request %s failed: %s, "
 833                                  "PAM error: %s (%d), NTSTATUS: %s, "
 834                                  "Error message was: %s",
 835                                  fn,
 836                                  wbcErrorString(status),
 837                                  _pam_error_code_str(e->pam_error),
 838                                  e->pam_error,
 839                                  e->nt_string,
 840                                  e->display_string);
 841                         ret = e->pam_error;
 842                         return pam_winbind_request_log(ctx, ret, username);
 843                 }
 844
 845                 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
 846
 847                 ret = PAM_SERVICE_ERR;
 848                 return pam_winbind_request_log(ctx, ret, username);
 849         }
 850
 851         ret = wbc_error_to_pam_error(status);
 852         return pam_winbind_request_log(ctx, ret, username);
 853 }
 854
 855
 856 /**
 857  * send a password expiry message if required
 858  *
 859  * @param ctx PAM winbind context.
 860  * @param next_change expected (calculated) next expiry date.
 861  * @param already_expired pointer to a boolean to indicate if the password is
 862  *        already expired.
 863  *
 864  * @return boolean Returns true if message has been sent, false if not.
 865  */
 866
 867 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
 868                                               time_t next_change,
 869                                               time_t now,
 870                                               int warn_pwd_expire,
 871                                               bool *already_expired)
 872 {
 873         int days = 0;
 874         struct tm tm_now, tm_next_change;
 875
 876         if (already_expired) {
 877                 *already_expired = false;
 878         }
 879
 880         if (next_change <= now) {
 881                 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
 882                 if (already_expired) {
 883                         *already_expired = true;
 884                 }
 885                 return true;
 886         }
 887
 888         if ((next_change < 0) ||
 889             (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
 890                 return false;
 891         }
 892
 893         if ((localtime_r(&now, &tm_now) == NULL) ||
 894             (localtime_r(&next_change, &tm_next_change) == NULL)) {
 895                 return false;
 896         }
 897
 898         days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
 899                (tm_now.tm_yday+tm_now.tm_year*365);
 900
 901         if (days == 0) {
 902                 _make_remark(ctx, PAM_TEXT_INFO,
 903                              _("Your password expires today"));
 904                 return true;
 905         }
 906
 907         if (days > 0 && days < warn_pwd_expire) {
 908                 _make_remark_format(ctx, PAM_TEXT_INFO,
 909                                     _("Your password will expire in %d %s"),
 910                                     days, (days > 1) ? _("days"):_("day"));
 911                 return true;
 912         }
 913
 914         return false;
 915 }
 916
 917 /**
 918  * Send a warning if the password expires in the near future
 919  *
 920  * @param ctx PAM winbind context.
 921  * @param response The full authentication response structure.
 922  * @param already_expired boolean, is the pwd already expired?
 923  *
 924  * @return void.
 925  */
 926
 927 static void _pam_warn_password_expiry(struct pwb_context *ctx,
 928                                       const struct winbindd_response *response,
 929                                       int warn_pwd_expire,
 930                                       bool *already_expired)
 931 {
 932         time_t now = time(NULL);
 933         time_t next_change = 0;
 934
 935         if (already_expired) {
 936                 *already_expired = false;
 937         }
 938
 939         /* accounts with ACB_PWNOEXP set never receive a warning */
 940         if (response->data.auth.info3.acct_flags & ACB_PWNOEXP) {
 941                 return;
 942         }
 943
 944         /* no point in sending a warning if this is a grace logon */
 945         if (PAM_WB_GRACE_LOGON(response->data.auth.info3.user_flgs)) {
 946                 return;
 947         }
 948
 949         /* check if the info3 must change timestamp has been set */
 950         next_change = response->data.auth.info3.pass_must_change_time;
 951
 952         if (_pam_send_password_expiry_message(ctx, next_change, now,
 953                                               warn_pwd_expire,
 954                                               already_expired)) {
 955                 return;
 956         }
 957
 958         /* now check for the global password policy */
 959         /* good catch from Ralf Haferkamp: an expiry of "never" is translated
 960          * to -1 */
 961         if (response->data.auth.policy.expire <= 0) {
 962                 return;
 963         }
 964
 965         next_change = response->data.auth.info3.pass_last_set_time +
 966                       response->data.auth.policy.expire;
 967
 968         if (_pam_send_password_expiry_message(ctx, next_change, now,
 969                                               warn_pwd_expire,
 970                                               already_expired)) {
 971                 return;
 972         }
 973
 974         /* no warning sent */
 975 }
 976
 977 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
 978
 979 /**
 980  * Append a string, making sure not to overflow and to always return a
 981  * NULL-terminated string.
 982  *
 983  * @param dest Destination string buffer (must already be NULL-terminated).
 984  * @param src Source string buffer.
 985  * @param dest_buffer_size Size of dest buffer in bytes.
 986  *
 987  * @return false if dest buffer is not big enough (no bytes copied), true on
 988  * success.
 989  */
 990
 991 static bool safe_append_string(char *dest,
 992                                const char *src,
 993                                int dest_buffer_size)
 994 {
 995         int dest_length = strlen(dest);
 996         int src_length = strlen(src);
 997
 998         if (dest_length + src_length + 1 > dest_buffer_size) {
 999                 return false;
1000         }
1001
1002         memcpy(dest + dest_length, src, src_length + 1);
1003         return true;
1004 }
1005
1006 /**
1007  * Convert a names into a SID string, appending it to a buffer.
1008  *
1009  * @param ctx PAM winbind context.
1010  * @param user User in PAM request.
1011  * @param name Name to convert.
1012  * @param sid_list_buffer Where to append the string sid.
1013  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1014  *
1015  * @return false on failure, true on success.
1016  */
1017 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
1018                                        const char *user,
1019                                        const char *name,
1020                                        char *sid_list_buffer,
1021                                        int sid_list_buffer_size)
1022 {
1023         const char* sid_string;
1024
1025         /* lookup name? */
1026         if (IS_SID_STRING(name)) {
1027                 sid_string = name;
1028         } else {
1029                 wbcErr wbc_status;
1030                 struct wbcDomainSid sid;
1031                 enum wbcSidType type;
1032                 char *sid_str;
1033
1034                 _pam_log_debug(ctx, LOG_DEBUG,
1035                                "no sid given, looking up: %s\n", name);
1036
1037                 wbc_status = wbcLookupName("", name, &sid, &type);
1038                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1039                         _pam_log(ctx, LOG_INFO,
1040                                  "could not lookup name: %s\n", name);
1041                         return false;
1042                 }
1043
1044                 wbc_status = wbcSidToString(&sid, &sid_str);
1045                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1046                         return false;
1047                 }
1048
1049                 wbcFreeMemory(sid_str);
1050                 sid_string = sid_str;
1051         }
1052
1053         if (!safe_append_string(sid_list_buffer, sid_string,
1054                                 sid_list_buffer_size)) {
1055                 return false;
1056         }
1057
1058         return true;
1059 }
1060
1061 /**
1062  * Convert a list of names into a list of sids.
1063  *
1064  * @param ctx PAM winbind context.
1065  * @param user User in PAM request.
1066  * @param name_list List of names or string sids, separated by commas.
1067  * @param sid_list_buffer Where to put the list of string sids.
1068  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1069  *
1070  * @return false on failure, true on success.
1071  */
1072 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1073                                                  const char *user,
1074                                                  const char *name_list,
1075                                                  char *sid_list_buffer,
1076                                                  int sid_list_buffer_size)
1077 {
1078         bool result = false;
1079         char *current_name = NULL;
1080         const char *search_location;
1081         const char *comma;
1082
1083         if (sid_list_buffer_size > 0) {
1084                 sid_list_buffer[0] = 0;
1085         }
1086
1087         search_location = name_list;
1088         while ((comma = strstr(search_location, ",")) != NULL) {
1089                 current_name = strndup(search_location,
1090                                        comma - search_location);
1091                 if (NULL == current_name) {
1092                         goto out;
1093                 }
1094
1095                 if (!winbind_name_to_sid_string(ctx, user,
1096                                                 current_name,
1097                                                 sid_list_buffer,
1098                                                 sid_list_buffer_size)) {
1099                         goto out;
1100                 }
1101
1102                 SAFE_FREE(current_name);
1103
1104                 if (!safe_append_string(sid_list_buffer, ",",
1105                                         sid_list_buffer_size)) {
1106                         goto out;
1107                 }
1108
1109                 search_location = comma + 1;
1110         }
1111
1112         if (!winbind_name_to_sid_string(ctx, user, search_location,
1113                                         sid_list_buffer,
1114                                         sid_list_buffer_size)) {
1115                 goto out;
1116         }
1117
1118         result = true;
1119
1120 out:
1121         SAFE_FREE(current_name);
1122         return result;
1123 }
1124
1125 /**
1126  * put krb5ccname variable into environment
1127  *
1128  * @param ctx PAM winbind context.
1129  * @param krb5ccname env variable retrieved from winbindd.
1130  *
1131  * @return void.
1132  */
1133
1134 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1135                                 const char *krb5ccname)
1136 {
1137         char var[PATH_MAX];
1138         int ret;
1139
1140         if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1141                 return;
1142         }
1143
1144         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1145                 return;
1146         }
1147
1148         _pam_log_debug(ctx, LOG_DEBUG,
1149                        "request returned KRB5CCNAME: %s", krb5ccname);
1150
1151         if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
1152                 return;
1153         }
1154
1155         ret = pam_putenv(ctx->pamh, var);
1156         if (ret) {
1157                 _pam_log(ctx, LOG_ERR,
1158                          "failed to set KRB5CCNAME to %s: %s",
1159                          var, pam_strerror(ctx->pamh, ret));
1160         }
1161 }
1162
1163 /**
1164  * Set string into the PAM stack.
1165  *
1166  * @param ctx PAM winbind context.
1167  * @param data_name Key name for pam_set_data.
1168  * @param value String value.
1169  *
1170  * @return void.
1171  */
1172
1173 static void _pam_set_data_string(struct pwb_context *ctx,
1174                                  const char *data_name,
1175                                  const char *value)
1176 {
1177         int ret;
1178
1179         if (!data_name || !value || (strlen(data_name) == 0) ||
1180              (strlen(value) == 0)) {
1181                 return;
1182         }
1183
1184         ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1185                            _pam_winbind_cleanup_func);
1186         if (ret) {
1187                 _pam_log_debug(ctx, LOG_DEBUG,
1188                                "Could not set data %s: %s\n",
1189                                data_name, pam_strerror(ctx->pamh, ret));
1190         }
1191 }
1192
1193 /**
1194  * Set info3 strings into the PAM stack.
1195  *
1196  * @param ctx PAM winbind context.
1197  * @param data_name Key name for pam_set_data.
1198  * @param value String value.
1199  *
1200  * @return void.
1201  */
1202
1203 static void _pam_set_data_info3(struct pwb_context *ctx,
1204                                 struct winbindd_response *response)
1205 {
1206         _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1207                              response->data.auth.info3.home_dir);
1208         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1209                              response->data.auth.info3.logon_script);
1210         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1211                              response->data.auth.info3.logon_srv);
1212         _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1213                              response->data.auth.info3.profile_path);
1214 }
1215
1216 /**
1217  * Free info3 strings in the PAM stack.
1218  *
1219  * @param pamh PAM handle
1220  *
1221  * @return void.
1222  */
1223
1224 static void _pam_free_data_info3(pam_handle_t *pamh)
1225 {
1226         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1227         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1228         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1229         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1230 }
1231
1232 /**
1233  * Send PAM_ERROR_MSG for cached or grace logons.
1234  *
1235  * @param ctx PAM winbind context.
1236  * @param username User in PAM request.
1237  * @param info3_user_flgs Info3 flags containing logon type bits.
1238  *
1239  * @return void.
1240  */
1241
1242 static void _pam_warn_logon_type(struct pwb_context *ctx,
1243                                  const char *username,
1244                                  uint32_t info3_user_flgs)
1245 {
1246         /* inform about logon type */
1247         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1248
1249                 _make_remark(ctx, PAM_ERROR_MSG,
1250                              _("Grace login. "
1251                                "Please change your password as soon you're "
1252                                "online again"));
1253                 _pam_log_debug(ctx, LOG_DEBUG,
1254                                "User %s logged on using grace logon\n",
1255                                username);
1256
1257         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1258
1259                 _make_remark(ctx, PAM_ERROR_MSG,
1260                              _("Domain Controller unreachable, "
1261                                "using cached credentials instead. "
1262                                "Network resources may be unavailable"));
1263                 _pam_log_debug(ctx, LOG_DEBUG,
1264                                "User %s logged on using cached credentials\n",
1265                                username);
1266         }
1267 }
1268
1269 /**
1270  * Send PAM_ERROR_MSG for krb5 errors.
1271  *
1272  * @param ctx PAM winbind context.
1273  * @param username User in PAM request.
1274  * @param info3_user_flgs Info3 flags containing logon type bits.
1275  *
1276  * @return void.
1277  */
1278
1279 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1280                                    const char *username,
1281                                    uint32_t info3_user_flgs)
1282 {
1283         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1284                 _make_remark(ctx, PAM_ERROR_MSG,
1285                              _("Failed to establish your Kerberos Ticket cache "
1286                                "due time differences\n"
1287                                "with the domain controller.  "
1288                                "Please verify the system time.\n"));
1289                 _pam_log_debug(ctx, LOG_DEBUG,
1290                                "User %s: Clock skew when getting Krb5 TGT\n",
1291                                username);
1292         }
1293 }
1294
1295 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1296                                        const struct wbcAuthErrorInfo *e,
1297                                        const char *nt_status_string,
1298                                        int *pam_error)
1299 {
1300         const char *ntstatus = NULL;
1301         const char *error_string = NULL;
1302
1303         if (!e || !pam_error) {
1304                 return false;
1305         }
1306
1307         ntstatus = e->nt_string;
1308         if (!ntstatus) {
1309                 return false;
1310         }
1311
1312         if (strcasecmp(ntstatus, nt_status_string) == 0) {
1313
1314                 error_string = _get_ntstatus_error_string(nt_status_string);
1315                 if (error_string) {
1316                         _make_remark(ctx, PAM_ERROR_MSG, error_string);
1317                         *pam_error = e->pam_error;
1318                         return true;
1319                 }
1320
1321                 if (e->display_string) {
1322                         _make_remark(ctx, PAM_ERROR_MSG, e->display_string);
1323                         *pam_error = e->pam_error;
1324                         return true;
1325                 }
1326
1327                 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1328                 *pam_error = e->pam_error;
1329
1330                 return true;
1331         }
1332
1333         return false;
1334 };
1335
1336 /**
1337  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1338  *
1339  * @param response The struct winbindd_response.
1340  *
1341  * @return string (caller needs to free).
1342  */
1343 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1344                                                  struct winbindd_response *response)
1345 {
1346         char *str = NULL;
1347
1348         str = talloc_asprintf(ctx, _("Your password "));
1349         if (!str) {
1350                 goto failed;
1351         }
1352
1353         if (response->data.auth.policy.min_length_password > 0) {
1354                 str = talloc_asprintf_append(str,
1355                                _("must be at least %d characters; "),
1356                                response->data.auth.policy.min_length_password);
1357                 if (!str) {
1358                         goto failed;
1359                 }
1360         }
1361
1362         if (response->data.auth.policy.password_history > 0) {
1363                 str = talloc_asprintf_append(str,
1364                                _("cannot repeat any of your previous %d "
1365                                  "passwords; "),
1366                                response->data.auth.policy.password_history);
1367                 if (!str) {
1368                         goto failed;
1369                 }
1370         }
1371
1372         if (response->data.auth.policy.password_properties &
1373             DOMAIN_PASSWORD_COMPLEX) {
1374                 str = talloc_asprintf_append(str,
1375                                _("must contain capitals, numerals "
1376                                  "or punctuation; "
1377                                  "and cannot contain your account "
1378                                  "or full name; "));
1379                 if (!str) {
1380                         goto failed;
1381                 }
1382         }
1383
1384         str = talloc_asprintf_append(str,
1385                        _("Please type a different password. "
1386                          "Type a password which meets these requirements in "
1387                          "both text boxes."));
1388         if (!str) {
1389                 goto failed;
1390         }
1391
1392         return str;
1393
1394  failed:
1395         TALLOC_FREE(str);
1396         return NULL;
1397 }
1398
1399 /* talk to winbindd */
1400 static int winbind_auth_request(struct pwb_context *ctx,
1401                                 const char *user,
1402                                 const char *pass,
1403                                 const char *member,
1404                                 const char *cctype,
1405                                 const int warn_pwd_expire,
1406                                 struct winbindd_response *p_response,
1407                                 time_t *pwd_last_set,
1408                                 char **user_ret)
1409 {
1410         struct winbindd_request request;
1411         struct winbindd_response response;
1412         int ret;
1413         bool already_expired = false;
1414
1415         ZERO_STRUCT(request);
1416         ZERO_STRUCT(response);
1417
1418         if (pwd_last_set) {
1419                 *pwd_last_set = 0;
1420         }
1421
1422         strncpy(request.data.auth.user, user,
1423                 sizeof(request.data.auth.user)-1);
1424
1425         strncpy(request.data.auth.pass, pass,
1426                 sizeof(request.data.auth.pass)-1);
1427
1428         request.data.auth.krb5_cc_type[0] = '\0';
1429         request.data.auth.uid = -1;
1430
1431         request.flags = WBFLAG_PAM_INFO3_TEXT | WBFLAG_PAM_GET_PWD_POLICY;
1432
1433         /* Krb5 auth always has to go against the KDC of the user's realm */
1434
1435         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1436                 request.flags |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1437         }
1438
1439         if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1440                 struct passwd *pwd = NULL;
1441
1442                 pwd = getpwnam(user);
1443                 if (pwd == NULL) {
1444                         return PAM_USER_UNKNOWN;
1445                 }
1446                 request.data.auth.uid = pwd->pw_uid;
1447         }
1448
1449         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1450
1451                 _pam_log_debug(ctx, LOG_DEBUG,
1452                                "enabling krb5 login flag\n");
1453
1454                 request.flags |= WBFLAG_PAM_KRB5 |
1455                                  WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1456         }
1457
1458         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1459                 _pam_log_debug(ctx, LOG_DEBUG,
1460                                "enabling cached login flag\n");
1461                 request.flags |= WBFLAG_PAM_CACHED_LOGIN;
1462         }
1463
1464         if (user_ret) {
1465                 *user_ret = NULL;
1466                 request.flags |= WBFLAG_PAM_UNIX_NAME;
1467         }
1468
1469         if (cctype != NULL) {
1470                 strncpy(request.data.auth.krb5_cc_type, cctype,
1471                         sizeof(request.data.auth.krb5_cc_type) - 1);
1472                 _pam_log_debug(ctx, LOG_DEBUG,
1473                                "enabling request for a %s krb5 ccache\n",
1474                                cctype);
1475         }
1476
1477         request.data.auth.require_membership_of_sid[0] = '\0';
1478
1479         if (member != NULL) {
1480
1481                 if (!winbind_name_list_to_sid_string_list(ctx, user,
1482                         member,
1483                         request.data.auth.require_membership_of_sid,
1484                         sizeof(request.data.auth.require_membership_of_sid))) {
1485
1486                         _pam_log_debug(ctx, LOG_ERR,
1487                                        "failed to serialize membership of sid "
1488                                        "\"%s\"\n", member);
1489                         return PAM_AUTH_ERR;
1490                 }
1491         }
1492
1493         ret = pam_winbind_request_log(ctx, WINBINDD_PAM_AUTH,
1494                                       &request, &response, user);
1495
1496         if (pwd_last_set) {
1497                 *pwd_last_set = response.data.auth.info3.pass_last_set_time;
1498         }
1499
1500         if (p_response) {
1501                 /* We want to process the response in the caller. */
1502                 *p_response = response;
1503                 return ret;
1504         }
1505
1506         if (ret) {
1507                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1508                                                  "NT_STATUS_PASSWORD_EXPIRED");
1509                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1510                                                  "NT_STATUS_PASSWORD_MUST_CHANGE");
1511                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1512                                                  "NT_STATUS_INVALID_WORKSTATION");
1513                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1514                                                  "NT_STATUS_INVALID_LOGON_HOURS");
1515                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1516                                                  "NT_STATUS_ACCOUNT_EXPIRED");
1517                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1518                                                  "NT_STATUS_ACCOUNT_DISABLED");
1519                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1520                                                  "NT_STATUS_ACCOUNT_LOCKED_OUT");
1521                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1522                                                  "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT");
1523                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1524                                                  "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT");
1525                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1526                                                  "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT");
1527                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1528                                                  "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
1529                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1530                                                  "NT_STATUS_NO_LOGON_SERVERS");
1531                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1532                                                  "NT_STATUS_WRONG_PASSWORD");
1533                 PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1534                                                  "NT_STATUS_ACCESS_DENIED");
1535         }
1536
1537         if (ret == PAM_SUCCESS) {
1538
1539                 /* warn a user if the password is about to expire soon */
1540                 _pam_warn_password_expiry(ctx, &response,
1541                                           warn_pwd_expire,
1542                                           &already_expired);
1543
1544                 if (already_expired == true) {
1545                         SMB_TIME_T last_set;
1546                         last_set = response.data.auth.info3.pass_last_set_time;
1547                         _pam_log_debug(ctx, LOG_DEBUG,
1548                                        "Password has expired "
1549                                        "(Password was last set: %lld, "
1550                                        "the policy says it should expire here "
1551                                        "%lld (now it's: %lu))\n",
1552                                        (long long int)last_set,
1553                                        (long long int)last_set +
1554                                        response.data.auth.policy.expire,
1555                                        time(NULL));
1556
1557                         return PAM_AUTHTOK_EXPIRED;
1558                 }
1559
1560                 /* inform about logon type */
1561                 _pam_warn_logon_type(ctx, user,
1562                                      response.data.auth.info3.user_flgs);
1563
1564                 /* inform about krb5 failures */
1565                 _pam_warn_krb5_failure(ctx, user,
1566                                        response.data.auth.info3.user_flgs);
1567
1568                 /* set some info3 info for other modules in the stack */
1569                 _pam_set_data_info3(ctx, &response);
1570
1571                 /* put krb5ccname into env */
1572                 _pam_setup_krb5_env(ctx, response.data.auth.krb5ccname);
1573
1574                 /* If winbindd returned a username, return the pointer to it
1575                  * here. */
1576                 if (user_ret && response.data.auth.unix_username[0]) {
1577                         /* We have to trust it's a null terminated string. */
1578                         *user_ret = strndup(response.data.auth.unix_username,
1579                                     sizeof(response.data.auth.unix_username) - 1);
1580                 }
1581         }
1582
1583         return ret;
1584 }
1585
1586 /* talk to winbindd */
1587 static int winbind_chauthtok_request(struct pwb_context *ctx,
1588                                      const char *user,
1589                                      const char *oldpass,
1590                                      const char *newpass,
1591                                      time_t pwd_last_set)
1592 {
1593         struct winbindd_request request;
1594         struct winbindd_response response;
1595         int ret;
1596
1597         ZERO_STRUCT(request);
1598         ZERO_STRUCT(response);
1599
1600         if (request.data.chauthtok.user == NULL) {
1601                 return -2;
1602         }
1603
1604         strncpy(request.data.chauthtok.user, user,
1605                 sizeof(request.data.chauthtok.user) - 1);
1606
1607         if (oldpass != NULL) {
1608                 strncpy(request.data.chauthtok.oldpass, oldpass,
1609                         sizeof(request.data.chauthtok.oldpass) - 1);
1610         } else {
1611                 request.data.chauthtok.oldpass[0] = '\0';
1612         }
1613
1614         if (newpass != NULL) {
1615                 strncpy(request.data.chauthtok.newpass, newpass,
1616                         sizeof(request.data.chauthtok.newpass) - 1);
1617         } else {
1618                 request.data.chauthtok.newpass[0] = '\0';
1619         }
1620
1621         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1622                 request.flags = WBFLAG_PAM_KRB5 |
1623                                 WBFLAG_PAM_CONTACT_TRUSTDOM;
1624         }
1625
1626         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1627                 request.flags |= WBFLAG_PAM_CACHED_LOGIN;
1628         }
1629
1630         ret = pam_winbind_request_log(ctx, WINBINDD_PAM_CHAUTHTOK,
1631                                       &request, &response, user);
1632
1633         if (ret == PAM_SUCCESS) {
1634                 return ret;
1635         }
1636
1637         PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1638                                          "NT_STATUS_BACKUP_CONTROLLER");
1639         PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1640                                          "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
1641         PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1642                                          "NT_STATUS_NO_LOGON_SERVERS");
1643         PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1644                                          "NT_STATUS_ACCESS_DENIED");
1645
1646         /* TODO: tell the min pwd length ? */
1647         PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1648                                          "NT_STATUS_PWD_TOO_SHORT");
1649
1650         /* TODO: tell the minage ? */
1651         PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1652                                          "NT_STATUS_PWD_TOO_RECENT");
1653
1654         /* TODO: tell the history length ? */
1655         PAM_WB_REMARK_CHECK_RESPONSE_RET(ctx, response,
1656                                          "NT_STATUS_PWD_HISTORY_CONFLICT");
1657
1658         if (!strcasecmp(response.data.auth.nt_status_string,
1659                         "NT_STATUS_PASSWORD_RESTRICTION")) {
1660
1661                 char *pwd_restriction_string = NULL;
1662                 SMB_TIME_T min_pwd_age;
1663                 uint32_t reject_reason = response.data.auth.reject_reason;
1664                 min_pwd_age = response.data.auth.policy.min_passwordage;
1665
1666                 /* FIXME: avoid to send multiple PAM messages after another */
1667                 switch (reject_reason) {
1668                         case -1:
1669                                 break;
1670                         case SAMR_REJECT_OTHER:
1671                                 if ((min_pwd_age > 0) &&
1672                                     (pwd_last_set + min_pwd_age > time(NULL))) {
1673                                         PAM_WB_REMARK_DIRECT(ctx,
1674                                              "NT_STATUS_PWD_TOO_RECENT");
1675                                 }
1676                                 break;
1677                         case SAMR_REJECT_TOO_SHORT:
1678                                 PAM_WB_REMARK_DIRECT(ctx,
1679                                         "NT_STATUS_PWD_TOO_SHORT");
1680                                 break;
1681                         case SAMR_REJECT_IN_HISTORY:
1682                                 PAM_WB_REMARK_DIRECT(ctx,
1683                                         "NT_STATUS_PWD_HISTORY_CONFLICT");
1684                                 break;
1685                         case SAMR_REJECT_COMPLEXITY:
1686                                 _make_remark(ctx, PAM_ERROR_MSG,
1687                                              _("Password does not meet "
1688                                                "complexity requirements"));
1689                                 break;
1690                         default:
1691                                 _pam_log_debug(ctx, LOG_DEBUG,
1692                                                "unknown password change "
1693                                                "reject reason: %d",
1694                                                reject_reason);
1695                                 break;
1696                 }
1697
1698                 pwd_restriction_string =
1699                         _pam_compose_pwd_restriction_string(ctx, &response);
1700                 if (pwd_restriction_string) {
1701                         _make_remark(ctx, PAM_ERROR_MSG,
1702                                      pwd_restriction_string);
1703                         TALLOC_FREE(pwd_restriction_string);
1704                 }
1705         }
1706
1707         return ret;
1708 }
1709
1710 /*
1711  * Checks if a user has an account
1712  *
1713  * return values:
1714  *       1  = User not found
1715  *       0  = OK
1716  *      -1  = System error
1717  */
1718 static int valid_user(struct pwb_context *ctx,
1719                       const char *user)
1720 {
1721         /* check not only if the user is available over NSS calls, also make
1722          * sure it's really a winbind user, this is important when stacking PAM
1723          * modules in the 'account' or 'password' facility. */
1724
1725         wbcErr wbc_status;
1726         struct passwd *pwd = NULL;
1727         struct passwd *wb_pwd = NULL;
1728
1729         pwd = getpwnam(user);
1730         if (pwd == NULL) {
1731                 return 1;
1732         }
1733
1734         wbc_status = wbcGetpwnam(user, &wb_pwd);
1735         wbcFreeMemory(wb_pwd);
1736         if (!WBC_ERROR_IS_OK(wbc_status)) {
1737                 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
1738                         wbcErrorString(wbc_status));
1739         }
1740
1741         switch (wbc_status) {
1742                 case WBC_ERR_UNKNOWN_USER:
1743                         return 1;
1744                 case WBC_ERR_SUCCESS:
1745                         return 0;
1746                 default:
1747                         break;
1748         }
1749         return -1;
1750 }
1751
1752 static char *_pam_delete(register char *xx)
1753 {
1754         _pam_overwrite(xx);
1755         _pam_drop(xx);
1756         return NULL;
1757 }
1758
1759 /*
1760  * obtain a password from the user
1761  */
1762
1763 static int _winbind_read_password(struct pwb_context *ctx,
1764                                   unsigned int ctrl,
1765                                   const char *comment,
1766                                   const char *prompt1,
1767                                   const char *prompt2,
1768                                   const char **pass)
1769 {
1770         int authtok_flag;
1771         int retval;
1772         const char *item;
1773         char *token;
1774
1775         _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
1776
1777         /*
1778          * make sure nothing inappropriate gets returned
1779          */
1780
1781         *pass = token = NULL;
1782
1783         /*
1784          * which authentication token are we getting?
1785          */
1786
1787         if (on(WINBIND__OLD_PASSWORD, ctrl)) {
1788                 authtok_flag = PAM_OLDAUTHTOK;
1789         } else {
1790                 authtok_flag = PAM_AUTHTOK;
1791         }
1792
1793         /*
1794          * should we obtain the password from a PAM item ?
1795          */
1796
1797         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
1798             on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1799                 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
1800                 if (retval != PAM_SUCCESS) {
1801                         /* very strange. */
1802                         _pam_log(ctx, LOG_ALERT,
1803                                  "pam_get_item returned error "
1804                                  "to unix-read-password");
1805                         return retval;
1806                 } else if (item != NULL) {      /* we have a password! */
1807                         *pass = item;
1808                         item = NULL;
1809                         _pam_log(ctx, LOG_DEBUG,
1810                                  "pam_get_item returned a password");
1811                         return PAM_SUCCESS;
1812                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1813                         return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
1814                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
1815                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
1816                         return PAM_AUTHTOK_RECOVER_ERR;
1817                 }
1818         }
1819         /*
1820          * getting here implies we will have to get the password from the
1821          * user directly.
1822          */
1823
1824         {
1825                 struct pam_message msg[3], *pmsg[3];
1826                 struct pam_response *resp;
1827                 int i, replies;
1828
1829                 /* prepare to converse */
1830
1831                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
1832                         pmsg[0] = &msg[0];
1833                         msg[0].msg_style = PAM_TEXT_INFO;
1834                         msg[0].msg = discard_const_p(char, comment);
1835                         i = 1;
1836                 } else {
1837                         i = 0;
1838                 }
1839
1840                 pmsg[i] = &msg[i];
1841                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
1842                 msg[i++].msg = discard_const_p(char, prompt1);
1843                 replies = 1;
1844
1845                 if (prompt2 != NULL) {
1846                         pmsg[i] = &msg[i];
1847                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
1848                         msg[i++].msg = discard_const_p(char, prompt2);
1849                         ++replies;
1850                 }
1851                 /* so call the conversation expecting i responses */
1852                 resp = NULL;
1853                 retval = converse(ctx->pamh, i, pmsg, &resp);
1854                 if (resp == NULL) {
1855                         if (retval == PAM_SUCCESS) {
1856                                 retval = PAM_AUTHTOK_RECOVER_ERR;
1857                         }
1858                         goto done;
1859                 }
1860                 if (retval != PAM_SUCCESS) {
1861                         _pam_drop_reply(resp, i);
1862                         goto done;
1863                 }
1864
1865                 /* interpret the response */
1866
1867                 token = x_strdup(resp[i - replies].resp);
1868                 if (!token) {
1869                         _pam_log(ctx, LOG_NOTICE,
1870                                  "could not recover "
1871                                  "authentication token");
1872                         retval = PAM_AUTHTOK_RECOVER_ERR;
1873                         goto done;
1874                 }
1875
1876                 if (replies == 2) {
1877                         /* verify that password entered correctly */
1878                         if (!resp[i - 1].resp ||
1879                             strcmp(token, resp[i - 1].resp)) {
1880                                 _pam_delete(token);     /* mistyped */
1881                                 retval = PAM_AUTHTOK_RECOVER_ERR;
1882                                 _make_remark(ctx, PAM_ERROR_MSG,
1883                                              MISTYPED_PASS);
1884                         }
1885                 }
1886
1887                 /*
1888                  * tidy up the conversation (resp_retcode) is ignored
1889                  * -- what is it for anyway? AGM
1890                  */
1891                 _pam_drop_reply(resp, i);
1892         }
1893
1894  done:
1895         if (retval != PAM_SUCCESS) {
1896                 _pam_log_debug(ctx, LOG_DEBUG,
1897                                "unable to obtain a password");
1898                 return retval;
1899         }
1900         /* 'token' is the entered password */
1901
1902         /* we store this password as an item */
1903
1904         retval = pam_set_item(ctx->pamh, authtok_flag, token);
1905         _pam_delete(token);     /* clean it up */
1906         if (retval != PAM_SUCCESS ||
1907             (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
1908
1909                 _pam_log(ctx, LOG_CRIT, "error manipulating password");
1910                 return retval;
1911
1912         }
1913
1914         *pass = item;
1915         item = NULL;            /* break link to password */
1916
1917         return PAM_SUCCESS;
1918 }
1919
1920 static const char *get_conf_item_string(struct pwb_context *ctx,
1921                                         const char *item,
1922                                         int config_flag)
1923 {
1924         int i = 0;
1925         const char *parm_opt = NULL;
1926
1927         if (!(ctx->ctrl & config_flag)) {
1928                 goto out;
1929         }
1930
1931         /* let the pam opt take precedence over the pam_winbind.conf option */
1932         for (i=0; i<ctx->argc; i++) {
1933
1934                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
1935                         char *p;
1936
1937                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
1938                                 _pam_log(ctx, LOG_INFO,
1939                                          "no \"=\" delimiter for \"%s\" found\n",
1940                                          item);
1941                                 goto out;
1942                         }
1943                         _pam_log_debug(ctx, LOG_INFO,
1944                                        "PAM config: %s '%s'\n", item, p+1);
1945                         return p + 1;
1946                 }
1947         }
1948
1949         if (ctx->dict) {
1950                 char *key = NULL;
1951
1952                 key = talloc_asprintf(ctx, "global:%s", item);
1953                 if (!key) {
1954                         goto out;
1955                 }
1956
1957                 parm_opt = iniparser_getstr(ctx->dict, key);
1958                 TALLOC_FREE(key);
1959
1960                 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
1961                                item, parm_opt);
1962         }
1963 out:
1964         return parm_opt;
1965 }
1966
1967 static int get_config_item_int(struct pwb_context *ctx,
1968                                const char *item,
1969                                int config_flag)
1970 {
1971         int i, parm_opt = -1;
1972
1973         if (!(ctx->ctrl & config_flag)) {
1974                 goto out;
1975         }
1976
1977         /* let the pam opt take precedence over the pam_winbind.conf option */
1978         for (i = 0; i < ctx->argc; i++) {
1979
1980                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
1981                         char *p;
1982
1983                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
1984                                 _pam_log(ctx, LOG_INFO,
1985                                          "no \"=\" delimiter for \"%s\" found\n",
1986                                          item);
1987                                 goto out;
1988                         }
1989                         parm_opt = atoi(p + 1);
1990                         _pam_log_debug(ctx, LOG_INFO,
1991                                        "PAM config: %s '%d'\n",
1992                                        item, parm_opt);
1993                         return parm_opt;
1994                 }
1995         }
1996
1997         if (ctx->dict) {
1998                 char *key = NULL;
1999
2000                 key = talloc_asprintf(ctx, "global:%s", item);
2001                 if (!key) {
2002                         goto out;
2003                 }
2004
2005                 parm_opt = iniparser_getint(ctx->dict, key, -1);
2006                 TALLOC_FREE(key);
2007
2008                 _pam_log_debug(ctx, LOG_INFO,
2009                                "CONFIG file: %s '%d'\n",
2010                                item, parm_opt);
2011         }
2012 out:
2013         return parm_opt;
2014 }
2015
2016 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2017 {
2018         return get_conf_item_string(ctx, "krb5_ccache_type",
2019                                     WINBIND_KRB5_CCACHE_TYPE);
2020 }
2021
2022 static const char *get_member_from_config(struct pwb_context *ctx)
2023 {
2024         const char *ret = NULL;
2025         ret = get_conf_item_string(ctx, "require_membership_of",
2026                                    WINBIND_REQUIRED_MEMBERSHIP);
2027         if (ret) {
2028                 return ret;
2029         }
2030         return get_conf_item_string(ctx, "require-membership-of",
2031                                     WINBIND_REQUIRED_MEMBERSHIP);
2032 }
2033
2034 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2035 {
2036         int ret;
2037         ret = get_config_item_int(ctx, "warn_pwd_expire",
2038                                   WINBIND_WARN_PWD_EXPIRE);
2039         /* no or broken setting */
2040         if (ret <= 0) {
2041                 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2042         }
2043         return ret;
2044 }
2045
2046 /**
2047  * Retrieve the winbind separator.
2048  *
2049  * @param ctx PAM winbind context.
2050  *
2051  * @return string separator character. NULL on failure.
2052  */
2053
2054 static char winbind_get_separator(struct pwb_context *ctx)
2055 {
2056         wbcErr wbc_status;
2057         static struct wbcInterfaceDetails *details = NULL;
2058
2059         wbc_status = wbcInterfaceDetails(&details);
2060         if (!WBC_ERROR_IS_OK(wbc_status)) {
2061                 _pam_log(ctx, LOG_ERR,
2062                          "Could not retrieve winbind interface details: %s",
2063                          wbcErrorString(wbc_status));
2064                 return '\0';
2065         }
2066
2067         if (!details) {
2068                 return '\0';
2069         }
2070
2071         return details->winbind_separator;
2072 }
2073
2074
2075 /**
2076  * Convert a upn to a name.
2077  *
2078  * @param ctx PAM winbind context.
2079  * @param upn  USer UPN to be trabslated.
2080  *
2081  * @return converted name. NULL pointer on failure. Caller needs to free.
2082  */
2083
2084 static char* winbind_upn_to_username(struct pwb_context *ctx,
2085                                      const char *upn)
2086 {
2087         char sep;
2088         wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2089         struct wbcDomainSid sid;
2090         enum wbcSidType type;
2091         char *domain;
2092         char *name;
2093
2094         /* This cannot work when the winbind separator = @ */
2095
2096         sep = winbind_get_separator(ctx);
2097         if (!sep || sep == '@') {
2098                 return NULL;
2099         }
2100
2101         /* Convert the UPN to a SID */
2102
2103         wbc_status = wbcLookupName("", upn, &sid, &type);
2104         if (!WBC_ERROR_IS_OK(wbc_status)) {
2105                 return NULL;
2106         }
2107
2108         /* Convert the the SID back to the sAMAccountName */
2109
2110         wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2111         if (!WBC_ERROR_IS_OK(wbc_status)) {
2112                 return NULL;
2113         }
2114
2115         return talloc_asprintf(ctx, "%s\\%s", domain, name);
2116 }
2117
2118 PAM_EXTERN
2119 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2120                         int argc, const char **argv)
2121 {
2122         const char *username;
2123         const char *password;
2124         const char *member = NULL;
2125         const char *cctype = NULL;
2126         int warn_pwd_expire;
2127         int retval = PAM_AUTH_ERR;
2128         char *username_ret = NULL;
2129         char *new_authtok_required = NULL;
2130         char *real_username = NULL;
2131         struct pwb_context *ctx = NULL;
2132
2133         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2134         if (retval) {
2135                 goto out;
2136         }
2137
2138         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2139
2140         /* Get the username */
2141         retval = pam_get_user(pamh, &username, NULL);
2142         if ((retval != PAM_SUCCESS) || (!username)) {
2143                 _pam_log_debug(ctx, LOG_DEBUG,
2144                                "can not get the username");
2145                 retval = PAM_SERVICE_ERR;
2146                 goto out;
2147         }
2148
2149
2150 #if defined(AIX)
2151         /* Decode the user name since AIX does not support logn user
2152            names by default.  The name is encoded as _#uid.  */
2153
2154         if (username[0] == '_') {
2155                 uid_t id = atoi(&username[1]);
2156                 struct passwd *pw = NULL;
2157
2158                 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2159                         real_username = strdup(pw->pw_name);
2160                 }
2161         }
2162 #endif
2163
2164         if (!real_username) {
2165                 /* Just making a copy of the username we got from PAM */
2166                 if ((real_username = strdup(username)) == NULL) {
2167                         _pam_log_debug(ctx, LOG_DEBUG,
2168                                        "memory allocation failure when copying "
2169                                        "username");
2170                         retval = PAM_SERVICE_ERR;
2171                         goto out;
2172                 }
2173         }
2174
2175         /* Maybe this was a UPN */
2176
2177         if (strchr(real_username, '@') != NULL) {
2178                 char *samaccountname = NULL;
2179
2180                 samaccountname = winbind_upn_to_username(ctx,
2181                                                          real_username);
2182                 if (samaccountname) {
2183                         free(real_username);
2184                         real_username = strdup(samaccountname);
2185                 }
2186         }
2187
2188         retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2189                                         _("Password: "), NULL,
2190                                         &password);
2191
2192         if (retval != PAM_SUCCESS) {
2193                 _pam_log(ctx, LOG_ERR,
2194                          "Could not retrieve user's password");
2195                 retval = PAM_AUTHTOK_ERR;
2196                 goto out;
2197         }
2198
2199         /* Let's not give too much away in the log file */
2200
2201 #ifdef DEBUG_PASSWORD
2202         _pam_log_debug(ctx, LOG_INFO,
2203                        "Verify user '%s' with password '%s'",
2204                        real_username, password);
2205 #else
2206         _pam_log_debug(ctx, LOG_INFO,
2207                        "Verify user '%s'", real_username);
2208 #endif
2209
2210         member = get_member_from_config(ctx);
2211         cctype = get_krb5_cc_type_from_config(ctx);
2212         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2213
2214         /* Now use the username to look up password */
2215         retval = winbind_auth_request(ctx, real_username, password,
2216                                       member, cctype, warn_pwd_expire, NULL,
2217                                       NULL, &username_ret);
2218
2219         if (retval == PAM_NEW_AUTHTOK_REQD ||
2220             retval == PAM_AUTHTOK_EXPIRED) {
2221
2222                 char *new_authtok_required_during_auth = NULL;
2223
2224                 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2225                 if (!new_authtok_required) {
2226                         retval = PAM_BUF_ERR;
2227                         goto out;
2228                 }
2229
2230                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2231                              new_authtok_required,
2232                              _pam_winbind_cleanup_func);
2233
2234                 retval = PAM_SUCCESS;
2235
2236                 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2237                 if (!new_authtok_required_during_auth) {
2238                         retval = PAM_BUF_ERR;
2239                         goto out;
2240                 }
2241
2242                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2243                              new_authtok_required_during_auth,
2244                              _pam_winbind_cleanup_func);
2245
2246                 goto out;
2247         }
2248
2249 out:
2250         if (username_ret) {
2251                 pam_set_item (pamh, PAM_USER, username_ret);
2252                 _pam_log_debug(ctx, LOG_INFO,
2253                                "Returned user was '%s'", username_ret);
2254                 free(username_ret);
2255         }
2256
2257         if (real_username) {
2258                 free(real_username);
2259         }
2260
2261         if (!new_authtok_required) {
2262                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2263         }
2264
2265         if (retval != PAM_SUCCESS) {
2266                 _pam_free_data_info3(pamh);
2267         }
2268
2269         _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2270
2271         TALLOC_FREE(ctx);
2272
2273         return retval;
2274 }
2275
2276 PAM_EXTERN
2277 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2278                    int argc, const char **argv)
2279 {
2280         int ret = PAM_SYSTEM_ERR;
2281         struct pwb_context *ctx = NULL;
2282
2283         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2284         if (ret) {
2285                 goto out;
2286         }
2287
2288         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2289
2290         switch (flags & ~PAM_SILENT) {
2291
2292                 case PAM_DELETE_CRED:
2293                         ret = pam_sm_close_session(pamh, flags, argc, argv);
2294                         break;
2295                 case PAM_REFRESH_CRED:
2296                         _pam_log_debug(ctx, LOG_WARNING,
2297                                        "PAM_REFRESH_CRED not implemented");
2298                         ret = PAM_SUCCESS;
2299                         break;
2300                 case PAM_REINITIALIZE_CRED:
2301                         _pam_log_debug(ctx, LOG_WARNING,
2302                                        "PAM_REINITIALIZE_CRED not implemented");
2303                         ret = PAM_SUCCESS;
2304                         break;
2305                 case PAM_ESTABLISH_CRED:
2306                         _pam_log_debug(ctx, LOG_WARNING,
2307                                        "PAM_ESTABLISH_CRED not implemented");
2308                         ret = PAM_SUCCESS;
2309                         break;
2310                 default:
2311                         ret = PAM_SYSTEM_ERR;
2312                         break;
2313         }
2314
2315  out:
2316
2317         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2318
2319         TALLOC_FREE(ctx);
2320
2321         return ret;
2322 }
2323
2324 /*
2325  * Account management. We want to verify that the account exists
2326  * before returning PAM_SUCCESS
2327  */
2328 PAM_EXTERN
2329 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2330                    int argc, const char **argv)
2331 {
2332         const char *username;
2333         int ret = PAM_USER_UNKNOWN;
2334         void *tmp = NULL;
2335         struct pwb_context *ctx = NULL;
2336
2337         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2338         if (ret) {
2339                 goto out;
2340         }
2341
2342         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2343
2344
2345         /* Get the username */
2346         ret = pam_get_user(pamh, &username, NULL);
2347         if ((ret != PAM_SUCCESS) || (!username)) {
2348                 _pam_log_debug(ctx, LOG_DEBUG,
2349                                "can not get the username");
2350                 ret = PAM_SERVICE_ERR;
2351                 goto out;
2352         }
2353
2354         /* Verify the username */
2355         ret = valid_user(ctx, username);
2356         switch (ret) {
2357         case -1:
2358                 /* some sort of system error. The log was already printed */
2359                 ret = PAM_SERVICE_ERR;
2360                 goto out;
2361         case 1:
2362                 /* the user does not exist */
2363                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2364                                username);
2365                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2366                         ret = PAM_IGNORE;
2367                         goto out;
2368                 }
2369                 ret = PAM_USER_UNKNOWN;
2370                 goto out;
2371         case 0:
2372                 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2373                              (const void **)&tmp);
2374                 if (tmp != NULL) {
2375                         ret = atoi((const char *)tmp);
2376                         switch (ret) {
2377                         case PAM_AUTHTOK_EXPIRED:
2378                                 /* fall through, since new token is required in this case */
2379                         case PAM_NEW_AUTHTOK_REQD:
2380                                 _pam_log(ctx, LOG_WARNING,
2381                                          "pam_sm_acct_mgmt success but %s is set",
2382                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
2383                                 _pam_log(ctx, LOG_NOTICE,
2384                                          "user '%s' needs new password",
2385                                          username);
2386                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2387                                 ret = PAM_NEW_AUTHTOK_REQD;
2388                                 goto out;
2389                         default:
2390                                 _pam_log(ctx, LOG_WARNING,
2391                                          "pam_sm_acct_mgmt success");
2392                                 _pam_log(ctx, LOG_NOTICE,
2393                                          "user '%s' granted access", username);
2394                                 ret = PAM_SUCCESS;
2395                                 goto out;
2396                         }
2397                 }
2398
2399                 /* Otherwise, the authentication looked good */
2400                 _pam_log(ctx, LOG_NOTICE,
2401                          "user '%s' granted access", username);
2402                 ret = PAM_SUCCESS;
2403                 goto out;
2404         default:
2405                 /* we don't know anything about this return value */
2406                 _pam_log(ctx, LOG_ERR,
2407                          "internal module error (ret = %d, user = '%s')",
2408                          ret, username);
2409                 ret = PAM_SERVICE_ERR;
2410                 goto out;
2411         }
2412
2413         /* should not be reached */
2414         ret = PAM_IGNORE;
2415
2416  out:
2417
2418         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2419
2420         TALLOC_FREE(ctx);
2421
2422         return ret;
2423 }
2424
2425 PAM_EXTERN
2426 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2427                         int argc, const char **argv)
2428 {
2429         int ret = PAM_SYSTEM_ERR;
2430         struct pwb_context *ctx = NULL;
2431
2432         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2433         if (ret) {
2434                 goto out;
2435         }
2436
2437         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2438
2439         ret = PAM_SUCCESS;
2440
2441  out:
2442         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2443
2444         TALLOC_FREE(ctx);
2445
2446         return ret;
2447 }
2448
2449 PAM_EXTERN
2450 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2451                          int argc, const char **argv)
2452 {
2453         int retval = PAM_SUCCESS;
2454         struct pwb_context *ctx = NULL;
2455
2456         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2457         if (retval) {
2458                 goto out;
2459         }
2460
2461         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2462
2463         if (!(flags & PAM_DELETE_CRED)) {
2464                 retval = PAM_SUCCESS;
2465                 goto out;
2466         }
2467
2468         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2469
2470                 /* destroy the ccache here */
2471                 struct winbindd_request request;
2472                 struct winbindd_response response;
2473                 const char *user;
2474                 const char *ccname = NULL;
2475                 struct passwd *pwd = NULL;
2476
2477                 ZERO_STRUCT(request);
2478                 ZERO_STRUCT(response);
2479
2480                 retval = pam_get_user(pamh, &user, _("Username: "));
2481                 if (retval) {
2482                         _pam_log(ctx, LOG_ERR,
2483                                  "could not identify user");
2484                         goto out;
2485                 }
2486
2487                 if (user == NULL) {
2488                         _pam_log(ctx, LOG_ERR,
2489                                  "username was NULL!");
2490                         retval = PAM_USER_UNKNOWN;
2491                         goto out;
2492                 }
2493
2494                 _pam_log_debug(ctx, LOG_DEBUG,
2495                                "username [%s] obtained", user);
2496
2497                 ccname = pam_getenv(pamh, "KRB5CCNAME");
2498                 if (ccname == NULL) {
2499                         _pam_log_debug(ctx, LOG_DEBUG,
2500                                        "user has no KRB5CCNAME environment");
2501                 }
2502
2503                 strncpy(request.data.logoff.user, user,
2504                         sizeof(request.data.logoff.user) - 1);
2505
2506                 if (ccname) {
2507                         strncpy(request.data.logoff.krb5ccname, ccname,
2508                                 sizeof(request.data.logoff.krb5ccname) - 1);
2509                 }
2510
2511                 pwd = getpwnam(user);
2512                 if (pwd == NULL) {
2513                         retval = PAM_USER_UNKNOWN;
2514                         goto out;
2515                 }
2516                 request.data.logoff.uid = pwd->pw_uid;
2517
2518                 request.flags = WBFLAG_PAM_KRB5 |
2519                                 WBFLAG_PAM_CONTACT_TRUSTDOM;
2520
2521                 retval = pam_winbind_request_log(ctx,
2522                                                  WINBINDD_PAM_LOGOFF,
2523                                                  &request, &response, user);
2524         }
2525
2526 out:
2527         /*
2528          * Delete the krb5 ccname variable from the PAM environment
2529          * if it was set by winbind.
2530          */
2531         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2532                 pam_putenv(pamh, "KRB5CCNAME");
2533         }
2534
2535         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, retval);
2536
2537         TALLOC_FREE(ctx);
2538
2539         return retval;
2540 }
2541
2542 /**
2543  * evaluate whether we need to re-authenticate with kerberos after a
2544  * password change
2545  *
2546  * @param ctx PAM winbind context.
2547  * @param user The username
2548  *
2549  * @return boolean Returns true if required, false if not.
2550  */
2551
2552 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2553                                                    const char *user)
2554 {
2555
2556         /* Make sure that we only do this if a) the chauthtok got initiated
2557          * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2558          * later password change via the "passwd" command if done by the user
2559          * itself
2560          * NB. If we login from gdm or xdm and the password expires,
2561          * we change the password, but there is no memory cache.
2562          * Thus, even for passthrough login, we should do the
2563          * authentication again to update memory cache.
2564          * --- BoYang
2565          * */
2566
2567         char *new_authtok_reqd_during_auth = NULL;
2568         struct passwd *pwd = NULL;
2569
2570         _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2571                       &new_authtok_reqd_during_auth);
2572         pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2573                      NULL, NULL);
2574
2575         if (new_authtok_reqd_during_auth) {
2576                 return true;
2577         }
2578
2579         pwd = getpwnam(user);
2580         if (!pwd) {
2581                 return false;
2582         }
2583
2584         if (getuid() == pwd->pw_uid) {
2585                 return true;
2586         }
2587
2588         return false;
2589 }
2590
2591
2592 PAM_EXTERN
2593 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2594                      int argc, const char **argv)
2595 {
2596         unsigned int lctrl;
2597         int ret;
2598         bool cached_login = false;
2599
2600         /* <DO NOT free() THESE> */
2601         const char *user;
2602         char *pass_old, *pass_new;
2603         /* </DO NOT free() THESE> */
2604
2605         char *Announce;
2606
2607         int retry = 0;
2608         char *username_ret = NULL;
2609         struct winbindd_response response;
2610         struct pwb_context *ctx = NULL;
2611
2612         ZERO_STRUCT(response);
2613
2614         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2615         if (ret) {
2616                 goto out;
2617         }
2618
2619         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
2620
2621         cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
2622
2623         /* clearing offline bit for auth */
2624         ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
2625
2626         /*
2627          * First get the name of a user
2628          */
2629         ret = pam_get_user(pamh, &user, _("Username: "));
2630         if (ret) {
2631                 _pam_log(ctx, LOG_ERR,
2632                          "password - could not identify user");
2633                 goto out;
2634         }
2635
2636         if (user == NULL) {
2637                 _pam_log(ctx, LOG_ERR, "username was NULL!");
2638                 ret = PAM_USER_UNKNOWN;
2639                 goto out;
2640         }
2641
2642         _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
2643
2644         /* check if this is really a user in winbindd, not only in NSS */
2645         ret = valid_user(ctx, user);
2646         switch (ret) {
2647                 case 1:
2648                         ret = PAM_USER_UNKNOWN;
2649                         goto out;
2650                 case -1:
2651                         ret = PAM_SYSTEM_ERR;
2652                         goto out;
2653                 default:
2654                         break;
2655         }
2656
2657         /*
2658          * obtain and verify the current password (OLDAUTHTOK) for
2659          * the user.
2660          */
2661
2662         if (flags & PAM_PRELIM_CHECK) {
2663                 time_t pwdlastset_prelim = 0;
2664
2665                 /* instruct user what is happening */
2666 #define greeting _("Changing password for ")
2667                 Announce = (char *) malloc(sizeof(greeting) + strlen(user));
2668                 if (Announce == NULL) {
2669                         _pam_log(ctx, LOG_CRIT,
2670                                  "password - out of memory");
2671                         ret = PAM_BUF_ERR;
2672                         goto out;
2673                 }
2674                 (void) strcpy(Announce, greeting);
2675                 (void) strcpy(Announce + sizeof(greeting) - 1, user);
2676 #undef greeting
2677
2678                 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
2679                 ret = _winbind_read_password(ctx, lctrl,
2680                                                 Announce,
2681                                                 _("(current) NT password: "),
2682                                                 NULL,
2683                                                 (const char **) &pass_old);
2684                 TALLOC_FREE(Announce);
2685                 if (ret != PAM_SUCCESS) {
2686                         _pam_log(ctx, LOG_NOTICE,
2687                                  "password - (old) token not obtained");
2688                         goto out;
2689                 }
2690
2691                 /* verify that this is the password for this user */
2692
2693                 ret = winbind_auth_request(ctx, user, pass_old,
2694                                            NULL, NULL, 0, &response,
2695                                            &pwdlastset_prelim, NULL);
2696
2697                 if (ret != PAM_ACCT_EXPIRED &&
2698                     ret != PAM_AUTHTOK_EXPIRED &&
2699                     ret != PAM_NEW_AUTHTOK_REQD &&
2700                     ret != PAM_SUCCESS) {
2701                         pass_old = NULL;
2702                         goto out;
2703                 }
2704
2705                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
2706                              (void *)pwdlastset_prelim, NULL);
2707
2708                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
2709                                    (const void *) pass_old);
2710                 pass_old = NULL;
2711                 if (ret != PAM_SUCCESS) {
2712                         _pam_log(ctx, LOG_CRIT,
2713                                  "failed to set PAM_OLDAUTHTOK");
2714                 }
2715         } else if (flags & PAM_UPDATE_AUTHTOK) {
2716
2717                 time_t pwdlastset_update = 0;
2718
2719                 /*
2720                  * obtain the proposed password
2721                  */
2722
2723                 /*
2724                  * get the old token back.
2725                  */
2726
2727                 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
2728
2729                 if (ret != PAM_SUCCESS) {
2730                         _pam_log(ctx, LOG_NOTICE,
2731                                  "user not authenticated");
2732                         goto out;
2733                 }
2734
2735                 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
2736
2737                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
2738                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
2739                 }
2740                 retry = 0;
2741                 ret = PAM_AUTHTOK_ERR;
2742                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
2743                         /*
2744                          * use_authtok is to force the use of a previously entered
2745                          * password -- needed for pluggable password strength checking
2746                          */
2747
2748                         ret = _winbind_read_password(ctx, lctrl,
2749                                                      NULL,
2750                                                      _("Enter new NT password: "),
2751                                                      _("Retype new NT password: "),
2752                                                      (const char **)&pass_new);
2753
2754                         if (ret != PAM_SUCCESS) {
2755                                 _pam_log_debug(ctx, LOG_ALERT,
2756                                                "password - "
2757                                                "new password not obtained");
2758                                 pass_old = NULL;/* tidy up */
2759                                 goto out;
2760                         }
2761
2762                         /*
2763                          * At this point we know who the user is and what they
2764                          * propose as their new password. Verify that the new
2765                          * password is acceptable.
2766                          */
2767
2768                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
2769                                 pass_new = NULL;
2770                         }
2771                 }
2772
2773                 /*
2774                  * By reaching here we have approved the passwords and must now
2775                  * rebuild the password database file.
2776                  */
2777                 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
2778                               &pwdlastset_update);
2779
2780                 /*
2781                  * if cached creds were enabled, make sure to set the
2782                  * WINBIND_CACHED_LOGIN bit here in order to have winbindd
2783                  * update the cached creds storage - gd
2784                  */
2785                 if (cached_login) {
2786                         ctx->ctrl |= WINBIND_CACHED_LOGIN;
2787                 }
2788
2789                 ret = winbind_chauthtok_request(ctx, user, pass_old,
2790                                                 pass_new, pwdlastset_update);
2791                 if (ret) {
2792                         _pam_overwrite(pass_new);
2793                         _pam_overwrite(pass_old);
2794                         pass_old = pass_new = NULL;
2795                         goto out;
2796                 }
2797
2798                 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
2799
2800                         const char *member = NULL;
2801                         const char *cctype = NULL;
2802                         int warn_pwd_expire;
2803
2804                         member = get_member_from_config(ctx);
2805                         cctype = get_krb5_cc_type_from_config(ctx);
2806                         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2807
2808                         /* Keep WINBIND_CACHED_LOGIN bit for
2809                          * authentication after changing the password.
2810                          * This will update the cached credentials in case
2811                          * that winbindd_dual_pam_chauthtok() fails
2812                          * to update them.
2813                          * --- BoYang
2814                          * */
2815
2816                         ret = winbind_auth_request(ctx, user, pass_new,
2817                                                    member, cctype, 0, &response,
2818                                                    NULL, &username_ret);
2819                         _pam_overwrite(pass_new);
2820                         _pam_overwrite(pass_old);
2821                         pass_old = pass_new = NULL;
2822
2823                         if (ret == PAM_SUCCESS) {
2824
2825                                 /* warn a user if the password is about to
2826                                  * expire soon */
2827                                 _pam_warn_password_expiry(ctx, &response,
2828                                                           warn_pwd_expire,
2829                                                           NULL);
2830
2831                                 /* set some info3 info for other modules in the
2832                                  * stack */
2833                                 _pam_set_data_info3(ctx, &response);
2834
2835                                 /* put krb5ccname into env */
2836                                 _pam_setup_krb5_env(ctx,
2837                                                     response.data.auth.krb5ccname);
2838
2839                                 if (username_ret) {
2840                                         pam_set_item(pamh, PAM_USER,
2841                                                      username_ret);
2842                                         _pam_log_debug(ctx, LOG_INFO,
2843                                                        "Returned user was '%s'",
2844                                                        username_ret);
2845                                         free(username_ret);
2846                                 }
2847                         }
2848
2849                         goto out;
2850                 }
2851         } else {
2852                 ret = PAM_SERVICE_ERR;
2853         }
2854
2855 out:
2856
2857         /* Deal with offline errors. */
2858         PAM_WB_REMARK_CHECK_RESPONSE(ctx, response,
2859                                      "NT_STATUS_NO_LOGON_SERVERS");
2860         PAM_WB_REMARK_CHECK_RESPONSE(ctx, response,
2861                                      "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
2862         PAM_WB_REMARK_CHECK_RESPONSE(ctx, response,
2863                                      "NT_STATUS_ACCESS_DENIED");
2864
2865         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
2866
2867         TALLOC_FREE(ctx);
2868
2869         return ret;
2870 }
2871
2872 #ifdef PAM_STATIC
2873
2874 /* static module data */
2875
2876 struct pam_module _pam_winbind_modstruct = {
2877         MODULE_NAME,
2878         pam_sm_authenticate,
2879         pam_sm_setcred,
2880         pam_sm_acct_mgmt,
2881         pam_sm_open_session,
2882         pam_sm_close_session,
2883         pam_sm_chauthtok
2884 };
2885
2886 #endif
2887
2888 /*
2889  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
2890  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
2891  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
2892  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2008
2893  * Copyright (c) Jan Rêkorajski 1999.
2894  * Copyright (c) Andrew G. Morgan 1996-8.
2895  * Copyright (c) Alex O. Yuriev, 1996.
2896  * Copyright (c) Cristian Gafton 1996.
2897  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
2898  *
2899  * Redistribution and use in source and binary forms, with or without
2900  * modification, are permitted provided that the following conditions
2901  * are met:
2902  * 1. Redistributions of source code must retain the above copyright
2903  *    notice, and the entire permission notice in its entirety,
2904  *    including the disclaimer of warranties.
2905  * 2. Redistributions in binary form must reproduce the above copyright
2906  *    notice, this list of conditions and the following disclaimer in the
2907  *    documentation and/or other materials provided with the distribution.
2908  * 3. The name of the author may not be used to endorse or promote
2909  *    products derived from this software without specific prior
2910  *    written permission.
2911  *
2912  * ALTERNATIVELY, this product may be distributed under the terms of
2913  * the GNU Public License, in which case the provisions of the GPL are
2914  * required INSTEAD OF the above restrictions.  (This clause is
2915  * necessary due to a potential bad interaction between the GPL and
2916  * the restrictions contained in a BSD-style copyright.)
2917  *
2918  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
2919  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
2920  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
2921  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
2922  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
2923  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
2924  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2925  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
2926  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
2927  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
2928  * OF THE POSSIBILITY OF SUCH DAMAGE.
2929  */