source3/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> 2005-2007
   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 #define _PAM_LOG_FUNCTION_ENTER(function, pamh, ctrl, flags) \
  16         do { \
  17                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "[pamh: %p] ENTER: " \
  18                                function " (flags: 0x%04x)", pamh, flags); \
  19                 _pam_log_state(pamh, ctrl); \
  20         } while (0)
  21
  22 #define _PAM_LOG_FUNCTION_LEAVE(function, pamh, ctrl, retval) \
  23         do { \
  24                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "[pamh: %p] LEAVE: " \
  25                                function " returning %d", pamh, retval); \
  26                 _pam_log_state(pamh, ctrl); \
  27         } while (0)
  28
  29 /* data tokens */
  30
  31 #define MAX_PASSWD_TRIES        3
  32
  33 /*
  34  * Work around the pam API that has functions with void ** as parameters
  35  * These lead to strict aliasing warnings with gcc.
  36  */
  37 static int _pam_get_item(const pam_handle_t *pamh,
  38                          int item_type,
  39                          const void *_item)
  40 {
  41         const void **item = (const void **)_item;
  42         return pam_get_item(pamh, item_type, item);
  43 }
  44 static int _pam_get_data(const pam_handle_t *pamh,
  45                          const char *module_data_name,
  46                          const void *_data)
  47 {
  48         const void **data = (const void **)_data;
  49         return pam_get_data(pamh, module_data_name, data);
  50 }
  51
  52 /* some syslogging */
  53
  54 #ifdef HAVE_PAM_VSYSLOG
  55 static void _pam_log_int(const pam_handle_t *pamh,
  56                          int err,
  57                          const char *format,
  58                          va_list args)
  59 {
  60         pam_vsyslog(pamh, err, format, args);
  61 }
  62 #else
  63 static void _pam_log_int(const pam_handle_t *pamh,
  64                          int err,
  65                          const char *format,
  66                          va_list args)
  67 {
  68         char *format2 = NULL;
  69         const char *service;
  70
  71         _pam_get_item(pamh, PAM_SERVICE, &service);
  72
  73         format2 = (char *)malloc(strlen(MODULE_NAME)+strlen(format)+strlen(service)+5);
  74         if (format2 == NULL) {
  75                 /* what else todo ? */
  76                 vsyslog(err, format, args);
  77                 return;
  78         }
  79
  80         sprintf(format2, "%s(%s): %s", MODULE_NAME, service, format);
  81         vsyslog(err, format2, args);
  82         SAFE_FREE(format2);
  83 }
  84 #endif /* HAVE_PAM_VSYSLOG */
  85
  86 static bool _pam_log_is_silent(int ctrl)
  87 {
  88         return on(ctrl, WINBIND_SILENT);
  89 }
  90
  91 static void _pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
  92 static void _pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
  93 {
  94         va_list args;
  95
  96         if (_pam_log_is_silent(ctrl)) {
  97                 return;
  98         }
  99
 100         va_start(args, format);
 101         _pam_log_int(pamh, err, format, args);
 102         va_end(args);
 103 }
 104
 105 static bool _pam_log_is_debug_enabled(int ctrl)
 106 {
 107         if (ctrl == -1) {
 108                 return false;
 109         }
 110
 111         if (_pam_log_is_silent(ctrl)) {
 112                 return false;
 113         }
 114
 115         if (!(ctrl & WINBIND_DEBUG_ARG)) {
 116                 return false;
 117         }
 118
 119         return true;
 120 }
 121
 122 static bool _pam_log_is_debug_state_enabled(int ctrl)
 123 {
 124         if (!(ctrl & WINBIND_DEBUG_STATE)) {
 125                 return false;
 126         }
 127
 128         return _pam_log_is_debug_enabled(ctrl);
 129 }
 130
 131 static void _pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 132 static void _pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 133 {
 134         va_list args;
 135
 136         if (!_pam_log_is_debug_enabled(ctrl)) {
 137                 return;
 138         }
 139
 140         va_start(args, format);
 141         _pam_log_int(pamh, err, format, args);
 142         va_end(args);
 143 }
 144
 145 static void _pam_log_state_datum(const pam_handle_t *pamh,
 146                                  int ctrl,
 147                                  int item_type,
 148                                  const char *key,
 149                                  int is_string)
 150 {
 151         const void *data = NULL;
 152         if (item_type != 0) {
 153                 pam_get_item(pamh, item_type, &data);
 154         } else {
 155                 pam_get_data(pamh, key, &data);
 156         }
 157         if (data != NULL) {
 158                 const char *type = (item_type != 0) ? "ITEM" : "DATA";
 159                 if (is_string != 0) {
 160                         _pam_log_debug(pamh, ctrl, LOG_DEBUG,
 161                                        "[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
 162                                        pamh, type, key, (const char *)data,
 163                                        data);
 164                 } else {
 165                         _pam_log_debug(pamh, ctrl, LOG_DEBUG,
 166                                        "[pamh: %p] STATE: %s(%s) = %p",
 167                                        pamh, type, key, data);
 168                 }
 169         }
 170 }
 171
 172 #define _PAM_LOG_STATE_DATA_POINTER(pamh, ctrl, module_data_name) \
 173         _pam_log_state_datum(pamh, ctrl, 0, module_data_name, 0)
 174
 175 #define _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, module_data_name) \
 176         _pam_log_state_datum(pamh, ctrl, 0, module_data_name, 1)
 177
 178 #define _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, item_type) \
 179         _pam_log_state_datum(pamh, ctrl, item_type, #item_type, 0)
 180
 181 #define _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, item_type) \
 182         _pam_log_state_datum(pamh, ctrl, item_type, #item_type, 1)
 183
 184 #ifdef DEBUG_PASSWORD
 185 #define _LOG_PASSWORD_AS_STRING 1
 186 #else
 187 #define _LOG_PASSWORD_AS_STRING 0
 188 #endif
 189
 190 #define _PAM_LOG_STATE_ITEM_PASSWORD(pamh, ctrl, item_type) \
 191         _pam_log_state_datum(pamh, ctrl, item_type, #item_type, \
 192                              _LOG_PASSWORD_AS_STRING)
 193
 194 static void _pam_log_state(const pam_handle_t *pamh, int ctrl)
 195 {
 196         if (!_pam_log_is_debug_state_enabled(ctrl)) {
 197                 return;
 198         }
 199
 200         _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_SERVICE);
 201         _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_USER);
 202         _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_TTY);
 203         _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_RHOST);
 204         _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_RUSER);
 205         _PAM_LOG_STATE_ITEM_PASSWORD(pamh, ctrl, PAM_OLDAUTHTOK);
 206         _PAM_LOG_STATE_ITEM_PASSWORD(pamh, ctrl, PAM_AUTHTOK);
 207         _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_USER_PROMPT);
 208         _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, PAM_CONV);
 209 #ifdef PAM_FAIL_DELAY
 210         _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, PAM_FAIL_DELAY);
 211 #endif
 212 #ifdef PAM_REPOSITORY
 213         _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, PAM_REPOSITORY);
 214 #endif
 215
 216         _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_HOMEDIR);
 217         _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_LOGONSCRIPT);
 218         _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_LOGONSERVER);
 219         _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_PROFILEPATH);
 220         _PAM_LOG_STATE_DATA_STRING(pamh, ctrl,
 221                                    PAM_WINBIND_NEW_AUTHTOK_REQD);
 222                                    /* Use atoi to get PAM result code */
 223         _PAM_LOG_STATE_DATA_STRING(pamh, ctrl,
 224                                    PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
 225         _PAM_LOG_STATE_DATA_POINTER(pamh, ctrl, PAM_WINBIND_PWD_LAST_SET);
 226 }
 227
 228 static int _pam_parse(const pam_handle_t *pamh,
 229                       int flags,
 230                       int argc,
 231                       const char **argv,
 232                       dictionary **result_d)
 233 {
 234         int ctrl = 0;
 235         const char *config_file = NULL;
 236         int i;
 237         const char **v;
 238         dictionary *d = NULL;
 239
 240         if (flags & PAM_SILENT) {
 241                 ctrl |= WINBIND_SILENT;
 242         }
 243
 244         for (i=argc,v=argv; i-- > 0; ++v) {
 245                 if (!strncasecmp(*v, "config", strlen("config"))) {
 246                         ctrl |= WINBIND_CONFIG_FILE;
 247                         config_file = v[i];
 248                         break;
 249                 }
 250         }
 251
 252         if (config_file == NULL) {
 253                 config_file = PAM_WINBIND_CONFIG_FILE;
 254         }
 255
 256         d = iniparser_load(config_file);
 257         if (d == NULL) {
 258                 goto config_from_pam;
 259         }
 260
 261         if (iniparser_getboolean(d, "global:debug", false)) {
 262                 ctrl |= WINBIND_DEBUG_ARG;
 263         }
 264
 265         if (iniparser_getboolean(d, "global:debug_state", false)) {
 266                 ctrl |= WINBIND_DEBUG_STATE;
 267         }
 268
 269         if (iniparser_getboolean(d, "global:cached_login", false)) {
 270                 ctrl |= WINBIND_CACHED_LOGIN;
 271         }
 272
 273         if (iniparser_getboolean(d, "global:krb5_auth", false)) {
 274                 ctrl |= WINBIND_KRB5_AUTH;
 275         }
 276
 277         if (iniparser_getboolean(d, "global:silent", false)) {
 278                 ctrl |= WINBIND_SILENT;
 279         }
 280
 281         if (iniparser_getstr(d, "global:krb5_ccache_type") != NULL) {
 282                 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 283         }
 284
 285         if ((iniparser_getstr(d, "global:require-membership-of") != NULL) ||
 286             (iniparser_getstr(d, "global:require_membership_of") != NULL)) {
 287                 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 288         }
 289
 290         if (iniparser_getboolean(d, "global:try_first_pass", false)) {
 291                 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 292         }
 293
 294         if (iniparser_getint(d, "global:warn_pwd_expire", 0)) {
 295                 ctrl |= WINBIND_WARN_PWD_EXPIRE;
 296         }
 297
 298 config_from_pam:
 299         /* step through arguments */
 300         for (i=argc,v=argv; i-- > 0; ++v) {
 301
 302                 /* generic options */
 303                 if (!strcmp(*v,"debug"))
 304                         ctrl |= WINBIND_DEBUG_ARG;
 305                 else if (!strcasecmp(*v, "debug_state"))
 306                         ctrl |= WINBIND_DEBUG_STATE;
 307                 else if (!strcasecmp(*v, "silent"))
 308                         ctrl |= WINBIND_SILENT;
 309                 else if (!strcasecmp(*v, "use_authtok"))
 310                         ctrl |= WINBIND_USE_AUTHTOK_ARG;
 311                 else if (!strcasecmp(*v, "use_first_pass"))
 312                         ctrl |= WINBIND_USE_FIRST_PASS_ARG;
 313                 else if (!strcasecmp(*v, "try_first_pass"))
 314                         ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 315                 else if (!strcasecmp(*v, "unknown_ok"))
 316                         ctrl |= WINBIND_UNKNOWN_OK_ARG;
 317                 else if (!strncasecmp(*v, "require_membership_of",
 318                                       strlen("require_membership_of")))
 319                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 320                 else if (!strncasecmp(*v, "require-membership-of",
 321                                       strlen("require-membership-of")))
 322                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 323                 else if (!strcasecmp(*v, "krb5_auth"))
 324                         ctrl |= WINBIND_KRB5_AUTH;
 325                 else if (!strncasecmp(*v, "krb5_ccache_type",
 326                                       strlen("krb5_ccache_type")))
 327                         ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 328                 else if (!strcasecmp(*v, "cached_login"))
 329                         ctrl |= WINBIND_CACHED_LOGIN;
 330                 else {
 331                         _pam_log(pamh, ctrl, LOG_ERR,
 332                                  "pam_parse: unknown option: %s", *v);
 333                         return -1;
 334                 }
 335
 336         }
 337
 338         if (result_d) {
 339                 *result_d = d;
 340         } else {
 341                 if (d) {
 342                         iniparser_freedict(d);
 343                 }
 344         }
 345
 346         return ctrl;
 347 };
 348
 349 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
 350                                       void *data,
 351                                       int error_status)
 352 {
 353         int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
 354         if (_pam_log_is_debug_state_enabled(ctrl)) {
 355                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
 356                                "[pamh: %p] CLEAN: cleaning up PAM data %p "
 357                                "(error_status = %d)", pamh, data,
 358                                error_status);
 359         }
 360         SAFE_FREE(data);
 361 }
 362
 363
 364 static const struct ntstatus_errors {
 365         const char *ntstatus_string;
 366         const char *error_string;
 367 } ntstatus_errors[] = {
 368         {"NT_STATUS_OK",
 369                 "Success"},
 370         {"NT_STATUS_BACKUP_CONTROLLER",
 371                 "No primary Domain Controler available"},
 372         {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
 373                 "No domain controllers found"},
 374         {"NT_STATUS_NO_LOGON_SERVERS",
 375                 "No logon servers"},
 376         {"NT_STATUS_PWD_TOO_SHORT",
 377                 "Password too short"},
 378         {"NT_STATUS_PWD_TOO_RECENT",
 379                 "The password of this user is too recent to change"},
 380         {"NT_STATUS_PWD_HISTORY_CONFLICT",
 381                 "Password is already in password history"},
 382         {"NT_STATUS_PASSWORD_EXPIRED",
 383                 "Your password has expired"},
 384         {"NT_STATUS_PASSWORD_MUST_CHANGE",
 385                 "You need to change your password now"},
 386         {"NT_STATUS_INVALID_WORKSTATION",
 387                 "You are not allowed to logon from this workstation"},
 388         {"NT_STATUS_INVALID_LOGON_HOURS",
 389                 "You are not allowed to logon at this time"},
 390         {"NT_STATUS_ACCOUNT_EXPIRED",
 391                 "Your account has expired. "
 392                 "Please contact your System administrator"}, /* SCNR */
 393         {"NT_STATUS_ACCOUNT_DISABLED",
 394                 "Your account is disabled. "
 395                 "Please contact your System administrator"}, /* SCNR */
 396         {"NT_STATUS_ACCOUNT_LOCKED_OUT",
 397                 "Your account has been locked. "
 398                 "Please contact your System administrator"}, /* SCNR */
 399         {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
 400                 "Invalid Trust Account"},
 401         {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
 402                 "Invalid Trust Account"},
 403         {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
 404                 "Invalid Trust Account"},
 405         {"NT_STATUS_ACCESS_DENIED",
 406                 "Access is denied"},
 407         {NULL, NULL}
 408 };
 409
 410 const char *_get_ntstatus_error_string(const char *nt_status_string)
 411 {
 412         int i;
 413         for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
 414                 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
 415                                 nt_status_string)) {
 416                         return ntstatus_errors[i].error_string;
 417                 }
 418         }
 419         return NULL;
 420 }
 421
 422 /* --- authentication management functions --- */
 423
 424 /* Attempt a conversation */
 425
 426 static int converse(pam_handle_t *pamh,
 427                     int nargs,
 428                     struct pam_message **message,
 429                     struct pam_response **response)
 430 {
 431         int retval;
 432         struct pam_conv *conv;
 433
 434         retval = _pam_get_item(pamh, PAM_CONV, &conv);
 435         if (retval == PAM_SUCCESS) {
 436                 retval = conv->conv(nargs,
 437                                     (const struct pam_message **)message,
 438                                     response, conv->appdata_ptr);
 439         }
 440
 441         return retval; /* propagate error status */
 442 }
 443
 444
 445 static int _make_remark(pam_handle_t * pamh,
 446                         int flags,
 447                         int type,
 448                         const char *text)
 449 {
 450         int retval = PAM_SUCCESS;
 451
 452         struct pam_message *pmsg[1], msg[1];
 453         struct pam_response *resp;
 454
 455         if (flags & WINBIND_SILENT) {
 456                 return PAM_SUCCESS;
 457         }
 458
 459         pmsg[0] = &msg[0];
 460         msg[0].msg = discard_const_p(char, text);
 461         msg[0].msg_style = type;
 462
 463         resp = NULL;
 464         retval = converse(pamh, 1, pmsg, &resp);
 465
 466         if (resp) {
 467                 _pam_drop_reply(resp, 1);
 468         }
 469         return retval;
 470 }
 471
 472 static int _make_remark_v(pam_handle_t *pamh,
 473                           int flags,
 474                           int type,
 475                           const char *format,
 476                           va_list args)
 477 {
 478         char *var;
 479         int ret;
 480
 481         ret = vasprintf(&var, format, args);
 482         if (ret < 0) {
 483                 _pam_log(pamh, 0, LOG_ERR, "memory allocation failure");
 484                 return ret;
 485         }
 486
 487         ret = _make_remark(pamh, flags, type, var);
 488         SAFE_FREE(var);
 489         return ret;
 490 }
 491
 492 static int _make_remark_format(pam_handle_t * pamh, int flags, int type, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 493 static int _make_remark_format(pam_handle_t * pamh, int flags, int type, const char *format, ...)
 494 {
 495         int ret;
 496         va_list args;
 497
 498         va_start(args, format);
 499         ret = _make_remark_v(pamh, flags, type, format, args);
 500         va_end(args);
 501         return ret;
 502 }
 503
 504 static int pam_winbind_request(pam_handle_t *pamh,
 505                                int ctrl,
 506                                enum winbindd_cmd req_type,
 507                                struct winbindd_request *request,
 508                                struct winbindd_response *response)
 509 {
 510         /* Fill in request and send down pipe */
 511         winbindd_init_request(request, req_type);
 512
 513         if (winbind_write_sock(request, sizeof(*request), 0, 0) == -1) {
 514                 _pam_log(pamh, ctrl, LOG_ERR,
 515                          "pam_winbind_request: write to socket failed!");
 516                 winbind_close_sock();
 517                 return PAM_SERVICE_ERR;
 518         }
 519
 520         /* Wait for reply */
 521         if (winbindd_read_reply(response) == -1) {
 522                 _pam_log(pamh, ctrl, LOG_ERR,
 523                          "pam_winbind_request: read from socket failed!");
 524                 winbind_close_sock();
 525                 return PAM_SERVICE_ERR;
 526         }
 527
 528         /* We are done with the socket - close it and avoid mischeif */
 529         winbind_close_sock();
 530
 531         /* Copy reply data from socket */
 532         if (response->result == WINBINDD_OK) {
 533                 return PAM_SUCCESS;
 534         }
 535
 536         /* no need to check for pam_error codes for getpwnam() */
 537         switch (req_type) {
 538
 539                 case WINBINDD_GETPWNAM:
 540                 case WINBINDD_LOOKUPNAME:
 541                         if (strlen(response->data.auth.nt_status_string) > 0) {
 542                                 _pam_log(pamh, ctrl, LOG_ERR,
 543                                          "request failed, NT error was %s",
 544                                          response->data.auth.nt_status_string);
 545                         } else {
 546                                 _pam_log(pamh, ctrl, LOG_ERR, "request failed");
 547                         }
 548                         return PAM_USER_UNKNOWN;
 549                 default:
 550                         break;
 551         }
 552
 553         if (response->data.auth.pam_error != PAM_SUCCESS) {
 554                 _pam_log(pamh, ctrl, LOG_ERR,
 555                          "request failed: %s, "
 556                          "PAM error was %s (%d), NT error was %s",
 557                          response->data.auth.error_string,
 558                          pam_strerror(pamh, response->data.auth.pam_error),
 559                          response->data.auth.pam_error,
 560                          response->data.auth.nt_status_string);
 561                 return response->data.auth.pam_error;
 562         }
 563
 564         _pam_log(pamh, ctrl, LOG_ERR, "request failed, but PAM error 0!");
 565
 566         return PAM_SERVICE_ERR;
 567 }
 568
 569 static int pam_winbind_request_log(pam_handle_t *pamh,
 570                                    int ctrl,
 571                                    enum winbindd_cmd req_type,
 572                                    struct winbindd_request *request,
 573                                    struct winbindd_response *response,
 574                                    const char *user)
 575 {
 576         int retval;
 577
 578         retval = pam_winbind_request(pamh, ctrl, req_type, request, response);
 579
 580         switch (retval) {
 581         case PAM_AUTH_ERR:
 582                 /* incorrect password */
 583                 _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' denied access "
 584                          "(incorrect password or invalid membership)", user);
 585                 return retval;
 586         case PAM_ACCT_EXPIRED:
 587                 /* account expired */
 588                 _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' account expired",
 589                          user);
 590                 return retval;
 591         case PAM_AUTHTOK_EXPIRED:
 592                 /* password expired */
 593                 _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' password expired",
 594                          user);
 595                 return retval;
 596         case PAM_NEW_AUTHTOK_REQD:
 597                 /* new password required */
 598                 _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' new password "
 599                          "required", user);
 600                 return retval;
 601         case PAM_USER_UNKNOWN:
 602                 /* the user does not exist */
 603                 _pam_log_debug(pamh, ctrl, LOG_NOTICE, "user '%s' not found",
 604                                user);
 605                 if (ctrl & WINBIND_UNKNOWN_OK_ARG) {
 606                         return PAM_IGNORE;
 607                 }
 608                 return retval;
 609         case PAM_SUCCESS:
 610                 /* Otherwise, the authentication looked good */
 611                 switch (req_type) {
 612                         case WINBINDD_INFO:
 613                                 break;
 614                         case WINBINDD_PAM_AUTH:
 615                                 _pam_log(pamh, ctrl, LOG_NOTICE,
 616                                          "user '%s' granted access", user);
 617                                 break;
 618                         case WINBINDD_PAM_CHAUTHTOK:
 619                                 _pam_log(pamh, ctrl, LOG_NOTICE,
 620                                          "user '%s' password changed", user);
 621                                 break;
 622                         default:
 623                                 _pam_log(pamh, ctrl, LOG_NOTICE,
 624                                          "user '%s' OK", user);
 625                                 break;
 626                 }
 627
 628                 return retval;
 629         default:
 630                 /* we don't know anything about this return value */
 631                 _pam_log(pamh, ctrl, LOG_ERR,
 632                          "internal module error (retval = %d, user = '%s')",
 633                          retval, user);
 634                 return retval;
 635         }
 636 }
 637
 638 /**
 639  * send a password expiry message if required
 640  *
 641  * @param pamh PAM handle
 642  * @param ctrl PAM winbind options.
 643  * @param next_change expected (calculated) next expiry date.
 644  * @param already_expired pointer to a boolean to indicate if the password is
 645  *        already expired.
 646  *
 647  * @return boolean Returns true if message has been sent, false if not.
 648  */
 649
 650 static bool _pam_send_password_expiry_message(pam_handle_t *pamh,
 651                                               int ctrl,
 652                                               time_t next_change,
 653                                               time_t now,
 654                                               int warn_pwd_expire,
 655                                               bool *already_expired)
 656 {
 657         int days = 0;
 658         struct tm tm_now, tm_next_change;
 659
 660         if (already_expired) {
 661                 *already_expired = false;
 662         }
 663
 664         if (next_change <= now) {
 665                 PAM_WB_REMARK_DIRECT(pamh, ctrl, "NT_STATUS_PASSWORD_EXPIRED");
 666                 if (already_expired) {
 667                         *already_expired = true;
 668                 }
 669                 return true;
 670         }
 671
 672         if ((next_change < 0) ||
 673             (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
 674                 return false;
 675         }
 676
 677         if ((localtime_r(&now, &tm_now) == NULL) ||
 678             (localtime_r(&next_change, &tm_next_change) == NULL)) {
 679                 return false;
 680         }
 681
 682         days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
 683                (tm_now.tm_yday+tm_now.tm_year*365);
 684
 685         if (days == 0) {
 686                 _make_remark(pamh, ctrl, PAM_TEXT_INFO,
 687                              "Your password expires today");
 688                 return true;
 689         }
 690
 691         if (days > 0 && days < warn_pwd_expire) {
 692                 _make_remark_format(pamh, ctrl, PAM_TEXT_INFO,
 693                                     "Your password will expire in %d %s",
 694                                     days, (days > 1) ? "days":"day");
 695                 return true;
 696         }
 697
 698         return false;
 699 }
 700
 701 /**
 702  * Send a warning if the password expires in the near future
 703  *
 704  * @param pamh PAM handle
 705  * @param ctrl PAM winbind options.
 706  * @param response The full authentication response structure.
 707  * @param already_expired boolean, is the pwd already expired?
 708  *
 709  * @return void.
 710  */
 711
 712 static void _pam_warn_password_expiry(pam_handle_t *pamh,
 713                                       int flags,
 714                                       const struct winbindd_response *response,
 715                                       int warn_pwd_expire,
 716                                       bool *already_expired)
 717 {
 718         time_t now = time(NULL);
 719         time_t next_change = 0;
 720
 721         if (already_expired) {
 722                 *already_expired = false;
 723         }
 724
 725         /* accounts with ACB_PWNOEXP set never receive a warning */
 726         if (response->data.auth.info3.acct_flags & ACB_PWNOEXP) {
 727                 return;
 728         }
 729
 730         /* no point in sending a warning if this is a grace logon */
 731         if (PAM_WB_GRACE_LOGON(response->data.auth.info3.user_flgs)) {
 732                 return;
 733         }
 734
 735         /* check if the info3 must change timestamp has been set */
 736         next_change = response->data.auth.info3.pass_must_change_time;
 737
 738         if (_pam_send_password_expiry_message(pamh, flags, next_change, now,
 739                                               warn_pwd_expire,
 740                                               already_expired)) {
 741                 return;
 742         }
 743
 744         /* now check for the global password policy */
 745         /* good catch from Ralf Haferkamp: an expiry of "never" is translated
 746          * to -1 */
 747         if (response->data.auth.policy.expire <= 0) {
 748                 return;
 749         }
 750
 751         next_change = response->data.auth.info3.pass_last_set_time +
 752                       response->data.auth.policy.expire;
 753
 754         if (_pam_send_password_expiry_message(pamh, flags, next_change, now,
 755                                               warn_pwd_expire,
 756                                               already_expired)) {
 757                 return;
 758         }
 759
 760         /* no warning sent */
 761 }
 762
 763 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
 764
 765 /**
 766  * Append a string, making sure not to overflow and to always return a
 767  * NULL-terminated string.
 768  *
 769  * @param dest Destination string buffer (must already be NULL-terminated).
 770  * @param src Source string buffer.
 771  * @param dest_buffer_size Size of dest buffer in bytes.
 772  *
 773  * @return false if dest buffer is not big enough (no bytes copied), true on
 774  * success.
 775  */
 776
 777 static bool safe_append_string(char *dest,
 778                                const char *src,
 779                                int dest_buffer_size)
 780 {
 781         int dest_length = strlen(dest);
 782         int src_length = strlen(src);
 783
 784         if (dest_length + src_length + 1 > dest_buffer_size) {
 785                 return false;
 786         }
 787
 788         memcpy(dest + dest_length, src, src_length + 1);
 789         return true;
 790 }
 791
 792 /**
 793  * Convert a names into a SID string, appending it to a buffer.
 794  *
 795  * @param pamh PAM handle
 796  * @param ctrl PAM winbind options.
 797  * @param user User in PAM request.
 798  * @param name Name to convert.
 799  * @param sid_list_buffer Where to append the string sid.
 800  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
 801  *
 802  * @return false on failure, true on success.
 803  */
 804 static bool winbind_name_to_sid_string(pam_handle_t *pamh,
 805                                        int ctrl,
 806                                        const char *user,
 807                                        const char *name,
 808                                        char *sid_list_buffer,
 809                                        int sid_list_buffer_size)
 810 {
 811         const char* sid_string;
 812         struct winbindd_response sid_response;
 813
 814         /* lookup name? */
 815         if (IS_SID_STRING(name)) {
 816                 sid_string = name;
 817         } else {
 818                 struct winbindd_request sid_request;
 819
 820                 ZERO_STRUCT(sid_request);
 821                 ZERO_STRUCT(sid_response);
 822
 823                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
 824                                "no sid given, looking up: %s\n", name);
 825
 826                 /* fortunatly winbindd can handle non-separated names */
 827                 strncpy(sid_request.data.name.name, name,
 828                         sizeof(sid_request.data.name.name) - 1);
 829
 830                 if (pam_winbind_request_log(pamh, ctrl, WINBINDD_LOOKUPNAME,
 831                                             &sid_request, &sid_response,
 832                                             user)) {
 833                         _pam_log(pamh, ctrl, LOG_INFO,
 834                                  "could not lookup name: %s\n", name);
 835                         return false;
 836                 }
 837
 838                 sid_string = sid_response.data.sid.sid;
 839         }
 840
 841         if (!safe_append_string(sid_list_buffer, sid_string,
 842                                 sid_list_buffer_size)) {
 843                 return false;
 844         }
 845
 846         return true;
 847 }
 848
 849 /**
 850  * Convert a list of names into a list of sids.
 851  *
 852  * @param pamh PAM handle
 853  * @param ctrl PAM winbind options.
 854  * @param user User in PAM request.
 855  * @param name_list List of names or string sids, separated by commas.
 856  * @param sid_list_buffer Where to put the list of string sids.
 857  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
 858  *
 859  * @return false on failure, true on success.
 860  */
 861 static bool winbind_name_list_to_sid_string_list(pam_handle_t *pamh,
 862                                                  int ctrl,
 863                                                  const char *user,
 864                                                  const char *name_list,
 865                                                  char *sid_list_buffer,
 866                                                  int sid_list_buffer_size)
 867 {
 868         bool result = false;
 869         char *current_name = NULL;
 870         const char *search_location;
 871         const char *comma;
 872
 873         if (sid_list_buffer_size > 0) {
 874                 sid_list_buffer[0] = 0;
 875         }
 876
 877         search_location = name_list;
 878         while ((comma = strstr(search_location, ",")) != NULL) {
 879                 current_name = strndup(search_location,
 880                                        comma - search_location);
 881                 if (NULL == current_name) {
 882                         goto out;
 883                 }
 884
 885                 if (!winbind_name_to_sid_string(pamh, ctrl, user,
 886                                                 current_name,
 887                                                 sid_list_buffer,
 888                                                 sid_list_buffer_size)) {
 889                         goto out;
 890                 }
 891
 892                 SAFE_FREE(current_name);
 893
 894                 if (!safe_append_string(sid_list_buffer, ",",
 895                                         sid_list_buffer_size)) {
 896                         goto out;
 897                 }
 898
 899                 search_location = comma + 1;
 900         }
 901
 902         if (!winbind_name_to_sid_string(pamh, ctrl, user, search_location,
 903                                         sid_list_buffer,
 904                                         sid_list_buffer_size)) {
 905                 goto out;
 906         }
 907
 908         result = true;
 909
 910 out:
 911         SAFE_FREE(current_name);
 912         return result;
 913 }
 914
 915 /**
 916  * put krb5ccname variable into environment
 917  *
 918  * @param pamh PAM handle
 919  * @param ctrl PAM winbind options.
 920  * @param krb5ccname env variable retrieved from winbindd.
 921  *
 922  * @return void.
 923  */
 924
 925 static void _pam_setup_krb5_env(pam_handle_t *pamh,
 926                                 int ctrl,
 927                                 const char *krb5ccname)
 928 {
 929         char var[PATH_MAX];
 930         int ret;
 931
 932         if (off(ctrl, WINBIND_KRB5_AUTH)) {
 933                 return;
 934         }
 935
 936         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
 937                 return;
 938         }
 939
 940         _pam_log_debug(pamh, ctrl, LOG_DEBUG,
 941                        "request returned KRB5CCNAME: %s", krb5ccname);
 942
 943         if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
 944                 return;
 945         }
 946
 947         ret = pam_putenv(pamh, var);
 948         if (ret) {
 949                 _pam_log(pamh, ctrl, LOG_ERR,
 950                          "failed to set KRB5CCNAME to %s: %s",
 951                          var, pam_strerror(pamh, ret));
 952         }
 953 }
 954
 955 /**
 956  * Set string into the PAM stack.
 957  *
 958  * @param pamh PAM handle
 959  * @param ctrl PAM winbind options.
 960  * @param data_name Key name for pam_set_data.
 961  * @param value String value.
 962  *
 963  * @return void.
 964  */
 965
 966 static void _pam_set_data_string(pam_handle_t *pamh,
 967                                  int ctrl,
 968                                  const char *data_name,
 969                                  const char *value)
 970 {
 971         int ret;
 972
 973         if (!data_name || !value || (strlen(data_name) == 0) ||
 974              (strlen(value) == 0)) {
 975                 return;
 976         }
 977
 978         ret = pam_set_data(pamh, data_name, (void *)strdup(value),
 979                            _pam_winbind_cleanup_func);
 980         if (ret) {
 981                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
 982                                "Could not set data %s: %s\n",
 983                                data_name, pam_strerror(pamh, ret));
 984         }
 985
 986 }
 987
 988 /**
 989  * Set info3 strings into the PAM stack.
 990  *
 991  * @param pamh PAM handle
 992  * @param ctrl PAM winbind options.
 993  * @param data_name Key name for pam_set_data.
 994  * @param value String value.
 995  *
 996  * @return void.
 997  */
 998
 999 static void _pam_set_data_info3(pam_handle_t *pamh,
1000                                 int ctrl,
1001                                 struct winbindd_response *response)
1002 {
1003         _pam_set_data_string(pamh, ctrl, PAM_WINBIND_HOMEDIR,
1004                              response->data.auth.info3.home_dir);
1005         _pam_set_data_string(pamh, ctrl, PAM_WINBIND_LOGONSCRIPT,
1006                              response->data.auth.info3.logon_script);
1007         _pam_set_data_string(pamh, ctrl, PAM_WINBIND_LOGONSERVER,
1008                              response->data.auth.info3.logon_srv);
1009         _pam_set_data_string(pamh, ctrl, PAM_WINBIND_PROFILEPATH,
1010                              response->data.auth.info3.profile_path);
1011 }
1012
1013 /**
1014  * Free info3 strings in the PAM stack.
1015  *
1016  * @param pamh PAM handle
1017  *
1018  * @return void.
1019  */
1020
1021 static void _pam_free_data_info3(pam_handle_t *pamh)
1022 {
1023         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1024         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1025         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1026         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1027 }
1028
1029 /**
1030  * Send PAM_ERROR_MSG for cached or grace logons.
1031  *
1032  * @param pamh PAM handle
1033  * @param ctrl PAM winbind options.
1034  * @param username User in PAM request.
1035  * @param info3_user_flgs Info3 flags containing logon type bits.
1036  *
1037  * @return void.
1038  */
1039
1040 static void _pam_warn_logon_type(pam_handle_t *pamh,
1041                                  int ctrl,
1042                                  const char *username,
1043                                  uint32_t info3_user_flgs)
1044 {
1045         /* inform about logon type */
1046         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1047
1048                 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
1049                              "Grace login. "
1050                              "Please change your password as soon you're "
1051                              "online again");
1052                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1053                                "User %s logged on using grace logon\n",
1054                                username);
1055
1056         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1057
1058                 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
1059                              "Domain Controller unreachable, "
1060                              "using cached credentials instead. "
1061                              "Network resources may be unavailable");
1062                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1063                                "User %s logged on using cached credentials\n",
1064                                username);
1065         }
1066 }
1067
1068 /**
1069  * Send PAM_ERROR_MSG for krb5 errors.
1070  *
1071  * @param pamh PAM handle
1072  * @param ctrl PAM winbind options.
1073  * @param username User in PAM request.
1074  * @param info3_user_flgs Info3 flags containing logon type bits.
1075  *
1076  * @return void.
1077  */
1078
1079 static void _pam_warn_krb5_failure(pam_handle_t *pamh,
1080                                    int ctrl,
1081                                    const char *username,
1082                                    uint32_t info3_user_flgs)
1083 {
1084         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1085                 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
1086                              "Failed to establish your Kerberos Ticket cache "
1087                              "due time differences\n"
1088                              "with the domain controller.  "
1089                              "Please verify the system time.\n");
1090                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1091                                "User %s: Clock skew when getting Krb5 TGT\n",
1092                                username);
1093         }
1094 }
1095
1096 /**
1097  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1098  *
1099  * @param response The struct winbindd_response.
1100  *
1101  * @return string (caller needs to free).
1102  */
1103
1104 static char *_pam_compose_pwd_restriction_string(struct winbindd_response *response)
1105 {
1106         char *str = NULL;
1107         size_t offset = 0, ret = 0, str_size = 1024;
1108
1109         str = (char *)malloc(str_size);
1110         if (!str) {
1111                 return NULL;
1112         }
1113
1114         memset(str, '\0', str_size);
1115
1116         offset = snprintf(str, str_size, "Your password ");
1117         if (offset == -1) {
1118                 goto failed;
1119         }
1120
1121         if (response->data.auth.policy.min_length_password > 0) {
1122                 ret = snprintf(str+offset, str_size-offset,
1123                                "must be at least %d characters; ",
1124                                response->data.auth.policy.min_length_password);
1125                 if (ret == -1) {
1126                         goto failed;
1127                 }
1128                 offset += ret;
1129         }
1130
1131         if (response->data.auth.policy.password_history > 0) {
1132                 ret = snprintf(str+offset, str_size-offset,
1133                                "cannot repeat any of your previous %d "
1134                                "passwords; ",
1135                                response->data.auth.policy.password_history);
1136                 if (ret == -1) {
1137                         goto failed;
1138                 }
1139                 offset += ret;
1140         }
1141
1142         if (response->data.auth.policy.password_properties &
1143             DOMAIN_PASSWORD_COMPLEX) {
1144                 ret = snprintf(str+offset, str_size-offset,
1145                                "must contain capitals, numerals "
1146                                "or punctuation; "
1147                                "and cannot contain your account "
1148                                "or full name; ");
1149                 if (ret == -1) {
1150                         goto failed;
1151                 }
1152                 offset += ret;
1153         }
1154
1155         ret = snprintf(str+offset, str_size-offset,
1156                        "Please type a different password. "
1157                        "Type a password which meets these requirements in "
1158                        "both text boxes.");
1159         if (ret == -1) {
1160                 goto failed;
1161         }
1162
1163         return str;
1164
1165  failed:
1166         SAFE_FREE(str);
1167         return NULL;
1168 }
1169
1170 /* talk to winbindd */
1171 static int winbind_auth_request(pam_handle_t * pamh,
1172                                 int ctrl,
1173                                 const char *user,
1174                                 const char *pass,
1175                                 const char *member,
1176                                 const char *cctype,
1177                                 const int warn_pwd_expire,
1178                                 struct winbindd_response *p_response,
1179                                 time_t *pwd_last_set,
1180                                 char **user_ret)
1181 {
1182         struct winbindd_request request;
1183         struct winbindd_response response;
1184         int ret;
1185         bool already_expired = false;
1186
1187         ZERO_STRUCT(request);
1188         ZERO_STRUCT(response);
1189
1190         if (pwd_last_set) {
1191                 *pwd_last_set = 0;
1192         }
1193
1194         strncpy(request.data.auth.user, user,
1195                 sizeof(request.data.auth.user)-1);
1196
1197         strncpy(request.data.auth.pass, pass,
1198                 sizeof(request.data.auth.pass)-1);
1199
1200         request.data.auth.krb5_cc_type[0] = '\0';
1201         request.data.auth.uid = -1;
1202
1203         request.flags = WBFLAG_PAM_INFO3_TEXT |
1204                         WBFLAG_PAM_GET_PWD_POLICY |
1205                         WBFLAG_PAM_CONTACT_TRUSTDOM;
1206
1207         if (ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1208                 struct passwd *pwd = NULL;
1209
1210                 pwd = getpwnam(user);
1211                 if (pwd == NULL) {
1212                         return PAM_USER_UNKNOWN;
1213                 }
1214                 request.data.auth.uid = pwd->pw_uid;
1215         }
1216
1217         if (ctrl & WINBIND_KRB5_AUTH) {
1218
1219                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1220                                "enabling krb5 login flag\n");
1221
1222                 request.flags |= WBFLAG_PAM_KRB5 |
1223                                  WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1224         }
1225
1226         if (ctrl & WINBIND_CACHED_LOGIN) {
1227                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1228                                "enabling cached login flag\n");
1229                 request.flags |= WBFLAG_PAM_CACHED_LOGIN;
1230         }
1231
1232         if (user_ret) {
1233                 *user_ret = NULL;
1234                 request.flags |= WBFLAG_PAM_UNIX_NAME;
1235         }
1236
1237         if (cctype != NULL) {
1238                 strncpy(request.data.auth.krb5_cc_type, cctype,
1239                         sizeof(request.data.auth.krb5_cc_type) - 1);
1240                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1241                                "enabling request for a %s krb5 ccache\n",
1242                                cctype);
1243         }
1244
1245         request.data.auth.require_membership_of_sid[0] = '\0';
1246
1247         if (member != NULL) {
1248
1249                 if (!winbind_name_list_to_sid_string_list(pamh, ctrl, user,
1250                         member,
1251                         request.data.auth.require_membership_of_sid,
1252                         sizeof(request.data.auth.require_membership_of_sid))) {
1253
1254                         _pam_log_debug(pamh, ctrl, LOG_ERR,
1255                                        "failed to serialize membership of sid "
1256                                        "\"%s\"\n", member);
1257                         return PAM_AUTH_ERR;
1258                 }
1259         }
1260
1261         ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_AUTH,
1262                                       &request, &response, user);
1263
1264         if (pwd_last_set) {
1265                 *pwd_last_set = response.data.auth.info3.pass_last_set_time;
1266         }
1267
1268         if (p_response) {
1269                 /* We want to process the response in the caller. */
1270                 *p_response = response;
1271                 return ret;
1272         }
1273
1274         if (ret) {
1275                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1276                                                  "NT_STATUS_PASSWORD_EXPIRED");
1277                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1278                                                  "NT_STATUS_PASSWORD_MUST_CHANGE");
1279                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1280                                                  "NT_STATUS_INVALID_WORKSTATION");
1281                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1282                                                  "NT_STATUS_INVALID_LOGON_HOURS");
1283                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1284                                                  "NT_STATUS_ACCOUNT_EXPIRED");
1285                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1286                                                  "NT_STATUS_ACCOUNT_DISABLED");
1287                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1288                                                  "NT_STATUS_ACCOUNT_LOCKED_OUT");
1289                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1290                                                  "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT");
1291                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1292                                                  "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT");
1293                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1294                                                  "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT");
1295                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1296                                                  "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
1297                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1298                                                  "NT_STATUS_NO_LOGON_SERVERS");
1299                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1300                                                  "NT_STATUS_WRONG_PASSWORD");
1301                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1302                                                  "NT_STATUS_ACCESS_DENIED");
1303         }
1304
1305         if (ret == PAM_SUCCESS) {
1306
1307                 /* warn a user if the password is about to expire soon */
1308                 _pam_warn_password_expiry(pamh, ctrl, &response,
1309                                           warn_pwd_expire,
1310                                           &already_expired);
1311
1312                 if (already_expired == true) {
1313                         SMB_TIME_T last_set;
1314                         last_set = response.data.auth.info3.pass_last_set_time;
1315                         _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1316                                        "Password has expired "
1317                                        "(Password was last set: %lld, "
1318                                        "the policy says it should expire here "
1319                                        "%lld (now it's: %lu))\n",
1320                                        (long long int)last_set,
1321                                        (long long int)last_set +
1322                                        response.data.auth.policy.expire,
1323                                        time(NULL));
1324
1325                         return PAM_AUTHTOK_EXPIRED;
1326                 }
1327
1328                 /* inform about logon type */
1329                 _pam_warn_logon_type(pamh, ctrl, user,
1330                                      response.data.auth.info3.user_flgs);
1331
1332                 /* inform about krb5 failures */
1333                 _pam_warn_krb5_failure(pamh, ctrl, user,
1334                                        response.data.auth.info3.user_flgs);
1335
1336                 /* set some info3 info for other modules in the stack */
1337                 _pam_set_data_info3(pamh, ctrl, &response);
1338
1339                 /* put krb5ccname into env */
1340                 _pam_setup_krb5_env(pamh, ctrl, response.data.auth.krb5ccname);
1341
1342                 /* If winbindd returned a username, return the pointer to it
1343                  * here. */
1344                 if (user_ret && response.data.auth.unix_username[0]) {
1345                         /* We have to trust it's a null terminated string. */
1346                         *user_ret = strndup(response.data.auth.unix_username,
1347                                     sizeof(response.data.auth.unix_username) - 1);
1348                 }
1349         }
1350
1351         return ret;
1352 }
1353
1354 /* talk to winbindd */
1355 static int winbind_chauthtok_request(pam_handle_t * pamh,
1356                                      int ctrl,
1357                                      const char *user,
1358                                      const char *oldpass,
1359                                      const char *newpass,
1360                                      time_t pwd_last_set)
1361 {
1362         struct winbindd_request request;
1363         struct winbindd_response response;
1364         int ret;
1365
1366         ZERO_STRUCT(request);
1367         ZERO_STRUCT(response);
1368
1369         if (request.data.chauthtok.user == NULL) {
1370                 return -2;
1371         }
1372
1373         strncpy(request.data.chauthtok.user, user,
1374                 sizeof(request.data.chauthtok.user) - 1);
1375
1376         if (oldpass != NULL) {
1377                 strncpy(request.data.chauthtok.oldpass, oldpass,
1378                         sizeof(request.data.chauthtok.oldpass) - 1);
1379         } else {
1380                 request.data.chauthtok.oldpass[0] = '\0';
1381         }
1382
1383         if (newpass != NULL) {
1384                 strncpy(request.data.chauthtok.newpass, newpass,
1385                         sizeof(request.data.chauthtok.newpass) - 1);
1386         } else {
1387                 request.data.chauthtok.newpass[0] = '\0';
1388         }
1389
1390         if (ctrl & WINBIND_KRB5_AUTH) {
1391                 request.flags = WBFLAG_PAM_KRB5 |
1392                                 WBFLAG_PAM_CONTACT_TRUSTDOM;
1393         }
1394
1395         ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_CHAUTHTOK,
1396                                       &request, &response, user);
1397
1398         if (ret == PAM_SUCCESS) {
1399                 return ret;
1400         }
1401
1402         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1403                                          "NT_STATUS_BACKUP_CONTROLLER");
1404         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1405                                          "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
1406         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1407                                          "NT_STATUS_NO_LOGON_SERVERS");
1408         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1409                                          "NT_STATUS_ACCESS_DENIED");
1410
1411         /* TODO: tell the min pwd length ? */
1412         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1413                                          "NT_STATUS_PWD_TOO_SHORT");
1414
1415         /* TODO: tell the minage ? */
1416         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1417                                          "NT_STATUS_PWD_TOO_RECENT");
1418
1419         /* TODO: tell the history length ? */
1420         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response,
1421                                          "NT_STATUS_PWD_HISTORY_CONFLICT");
1422
1423         if (!strcasecmp(response.data.auth.nt_status_string,
1424                         "NT_STATUS_PASSWORD_RESTRICTION")) {
1425
1426                 char *pwd_restriction_string = NULL;
1427                 SMB_TIME_T min_pwd_age;
1428                 uint32_t reject_reason = response.data.auth.reject_reason;
1429                 min_pwd_age = response.data.auth.policy.min_passwordage;
1430
1431                 /* FIXME: avoid to send multiple PAM messages after another */
1432                 switch (reject_reason) {
1433                         case -1:
1434                                 break;
1435                         case SAMR_REJECT_OTHER:
1436                                 if ((min_pwd_age > 0) &&
1437                                     (pwd_last_set + min_pwd_age > time(NULL))) {
1438                                         PAM_WB_REMARK_DIRECT(pamh, ctrl,
1439                                              "NT_STATUS_PWD_TOO_RECENT");
1440                                 }
1441                                 break;
1442                         case SAMR_REJECT_TOO_SHORT:
1443                                 PAM_WB_REMARK_DIRECT(pamh, ctrl,
1444                                         "NT_STATUS_PWD_TOO_SHORT");
1445                                 break;
1446                         case SAMR_REJECT_IN_HISTORY:
1447                                 PAM_WB_REMARK_DIRECT(pamh, ctrl,
1448                                         "NT_STATUS_PWD_HISTORY_CONFLICT");
1449                                 break;
1450                         case SAMR_REJECT_COMPLEXITY:
1451                                 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
1452                                              "Password does not meet "
1453                                              "complexity requirements");
1454                                 break;
1455                         default:
1456                                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1457                                                "unknown password change "
1458                                                "reject reason: %d",
1459                                                reject_reason);
1460                                 break;
1461                 }
1462
1463                 pwd_restriction_string =
1464                         _pam_compose_pwd_restriction_string(&response);
1465                 if (pwd_restriction_string) {
1466                         _make_remark(pamh, ctrl, PAM_ERROR_MSG,
1467                                      pwd_restriction_string);
1468                         SAFE_FREE(pwd_restriction_string);
1469                 }
1470         }
1471
1472         return ret;
1473 }
1474
1475 /*
1476  * Checks if a user has an account
1477  *
1478  * return values:
1479  *       1  = User not found
1480  *       0  = OK
1481  *      -1  = System error
1482  */
1483 static int valid_user(pam_handle_t *pamh,
1484                       int ctrl,
1485                       const char *user)
1486 {
1487         /* check not only if the user is available over NSS calls, also make
1488          * sure it's really a winbind user, this is important when stacking PAM
1489          * modules in the 'account' or 'password' facility. */
1490
1491         struct passwd *pwd = NULL;
1492         struct winbindd_request request;
1493         struct winbindd_response response;
1494         int ret;
1495
1496         ZERO_STRUCT(request);
1497         ZERO_STRUCT(response);
1498
1499         pwd = getpwnam(user);
1500         if (pwd == NULL) {
1501                 return 1;
1502         }
1503
1504         strncpy(request.data.username, user,
1505                 sizeof(request.data.username) - 1);
1506
1507         ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_GETPWNAM,
1508                                       &request, &response, user);
1509
1510         switch (ret) {
1511                 case PAM_USER_UNKNOWN:
1512                         return 1;
1513                 case PAM_SUCCESS:
1514                         return 0;
1515                 default:
1516                         break;
1517         }
1518         return -1;
1519 }
1520
1521 static char *_pam_delete(register char *xx)
1522 {
1523         _pam_overwrite(xx);
1524         _pam_drop(xx);
1525         return NULL;
1526 }
1527
1528 /*
1529  * obtain a password from the user
1530  */
1531
1532 static int _winbind_read_password(pam_handle_t * pamh,
1533                                   unsigned int ctrl,
1534                                   const char *comment,
1535                                   const char *prompt1,
1536                                   const char *prompt2,
1537                                   const char **pass)
1538 {
1539         int authtok_flag;
1540         int retval;
1541         const char *item;
1542         char *token;
1543
1544         _pam_log(pamh, ctrl, LOG_DEBUG, "getting password (0x%08x)", ctrl);
1545
1546         /*
1547          * make sure nothing inappropriate gets returned
1548          */
1549
1550         *pass = token = NULL;
1551
1552         /*
1553          * which authentication token are we getting?
1554          */
1555
1556         if (on(WINBIND__OLD_PASSWORD, ctrl)) {
1557                 authtok_flag = PAM_OLDAUTHTOK;
1558         } else {
1559                 authtok_flag = PAM_AUTHTOK;
1560         }
1561
1562         /*
1563          * should we obtain the password from a PAM item ?
1564          */
1565
1566         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
1567             on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1568                 retval = _pam_get_item(pamh, authtok_flag, &item);
1569                 if (retval != PAM_SUCCESS) {
1570                         /* very strange. */
1571                         _pam_log(pamh, ctrl, LOG_ALERT,
1572                                  "pam_get_item returned error "
1573                                  "to unix-read-password");
1574                         return retval;
1575                 } else if (item != NULL) {      /* we have a password! */
1576                         *pass = item;
1577                         item = NULL;
1578                         _pam_log(pamh, ctrl, LOG_DEBUG,
1579                                  "pam_get_item returned a password");
1580                         return PAM_SUCCESS;
1581                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1582                         return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
1583                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
1584                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
1585                         return PAM_AUTHTOK_RECOVER_ERR;
1586                 }
1587         }
1588         /*
1589          * getting here implies we will have to get the password from the
1590          * user directly.
1591          */
1592
1593         {
1594                 struct pam_message msg[3], *pmsg[3];
1595                 struct pam_response *resp;
1596                 int i, replies;
1597
1598                 /* prepare to converse */
1599
1600                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
1601                         pmsg[0] = &msg[0];
1602                         msg[0].msg_style = PAM_TEXT_INFO;
1603                         msg[0].msg = discard_const_p(char, comment);
1604                         i = 1;
1605                 } else {
1606                         i = 0;
1607                 }
1608
1609                 pmsg[i] = &msg[i];
1610                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
1611                 msg[i++].msg = discard_const_p(char, prompt1);
1612                 replies = 1;
1613
1614                 if (prompt2 != NULL) {
1615                         pmsg[i] = &msg[i];
1616                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
1617                         msg[i++].msg = discard_const_p(char, prompt2);
1618                         ++replies;
1619                 }
1620                 /* so call the conversation expecting i responses */
1621                 resp = NULL;
1622                 retval = converse(pamh, i, pmsg, &resp);
1623                 if (resp == NULL) {
1624                         if (retval == PAM_SUCCESS) {
1625                                 retval = PAM_AUTHTOK_RECOVER_ERR;
1626                         }
1627                         goto done;
1628                 }
1629                 if (retval != PAM_SUCCESS) {
1630                         _pam_drop_reply(resp, i);
1631                         goto done;
1632                 }
1633
1634                 /* interpret the response */
1635
1636                 token = x_strdup(resp[i - replies].resp);
1637                 if (!token) {
1638                         _pam_log(pamh, ctrl, LOG_NOTICE,
1639                                  "could not recover "
1640                                  "authentication token");
1641                         retval = PAM_AUTHTOK_RECOVER_ERR;
1642                         goto done;
1643                 }
1644
1645                 if (replies == 2) {
1646                         /* verify that password entered correctly */
1647                         if (!resp[i - 1].resp ||
1648                             strcmp(token, resp[i - 1].resp)) {
1649                                 _pam_delete(token);     /* mistyped */
1650                                 retval = PAM_AUTHTOK_RECOVER_ERR;
1651                                 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
1652                                              MISTYPED_PASS);
1653                         }
1654                 }
1655
1656                 /*
1657                  * tidy up the conversation (resp_retcode) is ignored
1658                  * -- what is it for anyway? AGM
1659                  */
1660                 _pam_drop_reply(resp, i);
1661         }
1662
1663  done:
1664         if (retval != PAM_SUCCESS) {
1665                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1666                                "unable to obtain a password");
1667                 return retval;
1668         }
1669         /* 'token' is the entered password */
1670
1671         /* we store this password as an item */
1672
1673         retval = pam_set_item(pamh, authtok_flag, token);
1674         _pam_delete(token);     /* clean it up */
1675         if (retval != PAM_SUCCESS ||
1676             (retval = _pam_get_item(pamh, authtok_flag, &item)) != PAM_SUCCESS) {
1677
1678                 _pam_log(pamh, ctrl, LOG_CRIT, "error manipulating password");
1679                 return retval;
1680
1681         }
1682
1683         *pass = item;
1684         item = NULL;            /* break link to password */
1685
1686         return PAM_SUCCESS;
1687 }
1688
1689 const char *get_conf_item_string(const pam_handle_t *pamh,
1690                                  int argc,
1691                                  const char **argv,
1692                                  int ctrl,
1693                                  dictionary *d,
1694                                  const char *item,
1695                                  int config_flag)
1696 {
1697         int i = 0;
1698         const char *parm_opt = NULL;
1699
1700         if (!(ctrl & config_flag)) {
1701                 goto out;
1702         }
1703
1704         /* let the pam opt take precedence over the pam_winbind.conf option */
1705         for (i=0; i<argc; i++) {
1706
1707                 if ((strncmp(argv[i], item, strlen(item)) == 0)) {
1708                         char *p;
1709
1710                         if ((p = strchr(argv[i], '=')) == NULL) {
1711                                 _pam_log(pamh, ctrl, LOG_INFO,
1712                                          "no \"=\" delimiter for \"%s\" found\n",
1713                                          item);
1714                                 goto out;
1715                         }
1716                         _pam_log_debug(pamh, ctrl, LOG_INFO,
1717                                        "PAM config: %s '%s'\n", item, p+1);
1718                         return p + 1;
1719                 }
1720         }
1721
1722         if (d != NULL) {
1723                 char *key = NULL;
1724
1725                 if (!asprintf(&key, "global:%s", item)) {
1726                         goto out;
1727                 }
1728
1729                 parm_opt = iniparser_getstr(d, key);
1730                 SAFE_FREE(key);
1731
1732                 _pam_log_debug(pamh, ctrl, LOG_INFO, "CONFIG file: %s '%s'\n",
1733                                item, parm_opt);
1734         }
1735 out:
1736         return parm_opt;
1737 }
1738
1739 int get_config_item_int(const pam_handle_t *pamh,
1740                               int argc,
1741                               const char **argv,
1742                               int ctrl,
1743                               dictionary *d,
1744                               const char *item,
1745                               int config_flag)
1746 {
1747         int i, parm_opt = -1;
1748
1749         if (!(ctrl & config_flag)) {
1750                 goto out;
1751         }
1752
1753         /* let the pam opt take precedence over the pam_winbind.conf option */
1754         for (i = 0; i < argc; i++) {
1755
1756                 if ((strncmp(argv[i], item, strlen(item)) == 0)) {
1757                         char *p;
1758
1759                         if ((p = strchr(argv[i], '=')) == NULL) {
1760                                 _pam_log(pamh, ctrl, LOG_INFO,
1761                                          "no \"=\" delimiter for \"%s\" found\n",
1762                                          item);
1763                                 goto out;
1764                         }
1765                         parm_opt = atoi(p + 1);
1766                         _pam_log_debug(pamh, ctrl, LOG_INFO,
1767                                        "PAM config: %s '%d'\n",
1768                                        item, parm_opt);
1769                         return parm_opt;
1770                 }
1771         }
1772
1773         if (d != NULL) {
1774                 char *key = NULL;
1775
1776                 if (!asprintf(&key, "global:%s", item)) {
1777                         goto out;
1778                 }
1779
1780                 parm_opt = iniparser_getint(d, key, -1);
1781                 SAFE_FREE(key);
1782
1783                 _pam_log_debug(pamh, ctrl, LOG_INFO,
1784                                "CONFIG file: %s '%d'\n",
1785                                item, parm_opt);
1786         }
1787 out:
1788         return parm_opt;
1789 }
1790
1791 const char *get_krb5_cc_type_from_config(const pam_handle_t *pamh,
1792                                          int argc,
1793                                          const char **argv,
1794                                          int ctrl,
1795                                          dictionary *d)
1796 {
1797         return get_conf_item_string(pamh, argc, argv, ctrl, d,
1798                                     "krb5_ccache_type",
1799                                     WINBIND_KRB5_CCACHE_TYPE);
1800 }
1801
1802 const char *get_member_from_config(const pam_handle_t *pamh,
1803                                    int argc,
1804                                    const char **argv,
1805                                    int ctrl,
1806                                    dictionary *d)
1807 {
1808         const char *ret = NULL;
1809         ret = get_conf_item_string(pamh, argc, argv, ctrl, d,
1810                                    "require_membership_of",
1811                                    WINBIND_REQUIRED_MEMBERSHIP);
1812         if (ret) {
1813                 return ret;
1814         }
1815         return get_conf_item_string(pamh, argc, argv, ctrl, d,
1816                                     "require-membership-of",
1817                                     WINBIND_REQUIRED_MEMBERSHIP);
1818 }
1819
1820 int get_warn_pwd_expire_from_config(const pam_handle_t *pamh,
1821                                     int argc,
1822                                     const char **argv,
1823                                     int ctrl,
1824                                     dictionary *d)
1825 {
1826         int ret;
1827         ret = get_config_item_int(pamh, argc, argv, ctrl, d,
1828                                   "warn_pwd_expire",
1829                                   WINBIND_WARN_PWD_EXPIRE);
1830         /* no or broken setting */
1831         if (ret <= 0) {
1832                 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
1833         }
1834         return ret;
1835 }
1836
1837 /**
1838  * Retrieve the winbind separator.
1839  *
1840  * @param pamh PAM handle
1841  * @param ctrl PAM winbind options.
1842  *
1843  * @return string separator character. NULL on failure.
1844  */
1845
1846 static char winbind_get_separator(pam_handle_t *pamh,
1847                                   int ctrl)
1848 {
1849         struct winbindd_request request;
1850         struct winbindd_response response;
1851
1852         ZERO_STRUCT(request);
1853         ZERO_STRUCT(response);
1854
1855         if (pam_winbind_request_log(pamh, ctrl, WINBINDD_INFO,
1856                                     &request, &response, NULL)) {
1857                 return '\0';
1858         }
1859
1860         return response.data.info.winbind_separator;
1861 }
1862
1863 /**
1864  * Convert a upn to a name.
1865  *
1866  * @param pamh PAM handle
1867  * @param ctrl PAM winbind options.
1868  * @param upn  USer UPN to be trabslated.
1869  *
1870  * @return converted name. NULL pointer on failure. Caller needs to free.
1871  */
1872
1873 static char* winbind_upn_to_username(pam_handle_t *pamh,
1874                                      int ctrl,
1875                                      const char *upn)
1876 {
1877         struct winbindd_request req;
1878         struct winbindd_response resp;
1879         int retval;
1880         char *account_name;
1881         int account_name_len;
1882         char sep;
1883
1884         /* This cannot work when the winbind separator = @ */
1885
1886         sep = winbind_get_separator(pamh, ctrl);
1887         if (!sep || sep == '@') {
1888                 return NULL;
1889         }
1890
1891         /* Convert the UPN to a SID */
1892
1893         ZERO_STRUCT(req);
1894         ZERO_STRUCT(resp);
1895
1896         strncpy(req.data.name.dom_name, "",
1897                 sizeof(req.data.name.dom_name) - 1);
1898         strncpy(req.data.name.name, upn,
1899                 sizeof(req.data.name.name) - 1);
1900         retval = pam_winbind_request_log(pamh, ctrl, WINBINDD_LOOKUPNAME,
1901                                          &req, &resp, upn);
1902         if (retval != PAM_SUCCESS) {
1903                 return NULL;
1904         }
1905
1906         /* Convert the the SID back to the sAMAccountName */
1907
1908         ZERO_STRUCT(req);
1909         strncpy(req.data.sid, resp.data.sid.sid, sizeof(req.data.sid)-1);
1910         ZERO_STRUCT(resp);
1911         retval =  pam_winbind_request_log(pamh, ctrl, WINBINDD_LOOKUPSID,
1912                                           &req, &resp, upn);
1913         if (retval != PAM_SUCCESS) {
1914                 return NULL;
1915         }
1916
1917         account_name_len = asprintf(&account_name, "%s\\%s",
1918                                     resp.data.name.dom_name,
1919                                     resp.data.name.name);
1920
1921         return account_name;
1922 }
1923
1924 PAM_EXTERN
1925 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
1926                         int argc, const char **argv)
1927 {
1928         const char *username;
1929         const char *password;
1930         const char *member = NULL;
1931         const char *cctype = NULL;
1932         int warn_pwd_expire;
1933         int retval = PAM_AUTH_ERR;
1934         dictionary *d = NULL;
1935         char *username_ret = NULL;
1936         char *new_authtok_required = NULL;
1937         char *real_username = NULL;
1938
1939         /* parse arguments */
1940         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1941         if (ctrl == -1) {
1942                 retval = PAM_SYSTEM_ERR;
1943                 goto out;
1944         }
1945
1946         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", pamh, ctrl, flags);
1947
1948         /* Get the username */
1949         retval = pam_get_user(pamh, &username, NULL);
1950         if ((retval != PAM_SUCCESS) || (!username)) {
1951                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1952                                "can not get the username");
1953                 retval = PAM_SERVICE_ERR;
1954                 goto out;
1955         }
1956
1957
1958 #if defined(AIX)
1959         /* Decode the user name since AIX does not support logn user
1960            names by default.  The name is encoded as _#uid.  */
1961
1962         if (username[0] == '_') {
1963                 uid_t id = atoi(&username[1]);
1964                 struct passwd *pw = NULL;
1965
1966                 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
1967                         real_username = strdup(pw->pw_name);
1968                 }
1969         }
1970 #endif
1971
1972         if (!real_username) {
1973                 /* Just making a copy of the username we got from PAM */
1974                 if ((real_username = strdup(username)) == NULL) {
1975                         _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1976                                        "memory allocation failure when copying "
1977                                        "username");
1978                         retval = PAM_SERVICE_ERR;
1979                         goto out;
1980                 }
1981         }
1982
1983         /* Maybe this was a UPN */
1984
1985         if (strchr(real_username, '@') != NULL) {
1986                 char *samaccountname = NULL;
1987
1988                 samaccountname = winbind_upn_to_username(pamh, ctrl,
1989                                                          real_username);
1990                 if (samaccountname) {
1991                         free(real_username);
1992                         real_username = samaccountname;
1993                 }
1994         }
1995
1996         retval = _winbind_read_password(pamh, ctrl, NULL,
1997                                         "Password: ", NULL,
1998                                         &password);
1999
2000         if (retval != PAM_SUCCESS) {
2001                 _pam_log(pamh, ctrl, LOG_ERR,
2002                          "Could not retrieve user's password");
2003                 retval = PAM_AUTHTOK_ERR;
2004                 goto out;
2005         }
2006
2007         /* Let's not give too much away in the log file */
2008
2009 #ifdef DEBUG_PASSWORD
2010         _pam_log_debug(pamh, ctrl, LOG_INFO,
2011                        "Verify user '%s' with password '%s'",
2012                        real_username, password);
2013 #else
2014         _pam_log_debug(pamh, ctrl, LOG_INFO,
2015                        "Verify user '%s'", real_username);
2016 #endif
2017
2018         member = get_member_from_config(pamh, argc, argv, ctrl, d);
2019
2020         cctype = get_krb5_cc_type_from_config(pamh, argc, argv, ctrl, d);
2021
2022         warn_pwd_expire = get_warn_pwd_expire_from_config(pamh, argc, argv,
2023                                                           ctrl, d);
2024
2025         /* Now use the username to look up password */
2026         retval = winbind_auth_request(pamh, ctrl, real_username, password,
2027                                       member, cctype, warn_pwd_expire, NULL,
2028                                       NULL, &username_ret);
2029
2030         if (retval == PAM_NEW_AUTHTOK_REQD ||
2031             retval == PAM_AUTHTOK_EXPIRED) {
2032
2033                 char *new_authtok_required_during_auth = NULL;
2034
2035                 if (!asprintf(&new_authtok_required, "%d", retval)) {
2036                         retval = PAM_BUF_ERR;
2037                         goto out;
2038                 }
2039
2040                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2041                              new_authtok_required,
2042                              _pam_winbind_cleanup_func);
2043
2044                 retval = PAM_SUCCESS;
2045
2046                 if (!asprintf(&new_authtok_required_during_auth, "%d", true)) {
2047                         retval = PAM_BUF_ERR;
2048                         goto out;
2049                 }
2050
2051                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2052                              new_authtok_required_during_auth,
2053                              _pam_winbind_cleanup_func);
2054
2055                 goto out;
2056         }
2057
2058 out:
2059         if (username_ret) {
2060                 pam_set_item (pamh, PAM_USER, username_ret);
2061                 _pam_log_debug(pamh, ctrl, LOG_INFO,
2062                                "Returned user was '%s'", username_ret);
2063                 free(username_ret);
2064         }
2065
2066         if (real_username) {
2067                 free(real_username);
2068         }
2069
2070         if (d) {
2071                 iniparser_freedict(d);
2072         }
2073
2074         if (!new_authtok_required) {
2075                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2076         }
2077
2078         if (retval != PAM_SUCCESS) {
2079                 _pam_free_data_info3(pamh);
2080         }
2081
2082         _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", pamh, ctrl, retval);
2083
2084         return retval;
2085 }
2086
2087 PAM_EXTERN
2088 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2089                    int argc, const char **argv)
2090 {
2091         int ret = PAM_SYSTEM_ERR;
2092         dictionary *d = NULL;
2093
2094         /* parse arguments */
2095         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
2096         if (ctrl == -1) {
2097                 ret = PAM_SYSTEM_ERR;
2098                 goto out;
2099         }
2100
2101         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", pamh, ctrl, flags);
2102
2103         switch (flags & ~PAM_SILENT) {
2104
2105                 case PAM_DELETE_CRED:
2106                         ret = pam_sm_close_session(pamh, flags, argc, argv);
2107                         break;
2108                 case PAM_REFRESH_CRED:
2109                         _pam_log_debug(pamh, ctrl, LOG_WARNING,
2110                                        "PAM_REFRESH_CRED not implemented");
2111                         ret = PAM_SUCCESS;
2112                         break;
2113                 case PAM_REINITIALIZE_CRED:
2114                         _pam_log_debug(pamh, ctrl, LOG_WARNING,
2115                                        "PAM_REINITIALIZE_CRED not implemented");
2116                         ret = PAM_SUCCESS;
2117                         break;
2118                 case PAM_ESTABLISH_CRED:
2119                         _pam_log_debug(pamh, ctrl, LOG_WARNING,
2120                                        "PAM_ESTABLISH_CRED not implemented");
2121                         ret = PAM_SUCCESS;
2122                         break;
2123                 default:
2124                         ret = PAM_SYSTEM_ERR;
2125                         break;
2126         }
2127
2128  out:
2129         if (d) {
2130                 iniparser_freedict(d);
2131         }
2132
2133         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", pamh, ctrl, ret);
2134
2135         return ret;
2136 }
2137
2138 /*
2139  * Account management. We want to verify that the account exists
2140  * before returning PAM_SUCCESS
2141  */
2142 PAM_EXTERN
2143 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2144                    int argc, const char **argv)
2145 {
2146         const char *username;
2147         int ret = PAM_USER_UNKNOWN;
2148         void *tmp = NULL;
2149         dictionary *d = NULL;
2150
2151         /* parse arguments */
2152         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
2153         if (ctrl == -1) {
2154                 return PAM_SYSTEM_ERR;
2155         }
2156
2157         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", pamh, ctrl, flags);
2158
2159
2160         /* Get the username */
2161         ret = pam_get_user(pamh, &username, NULL);
2162         if ((ret != PAM_SUCCESS) || (!username)) {
2163                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
2164                                "can not get the username");
2165                 ret = PAM_SERVICE_ERR;
2166                 goto out;
2167         }
2168
2169         /* Verify the username */
2170         ret = valid_user(pamh, ctrl, username);
2171         switch (ret) {
2172         case -1:
2173                 /* some sort of system error. The log was already printed */
2174                 ret = PAM_SERVICE_ERR;
2175                 goto out;
2176         case 1:
2177                 /* the user does not exist */
2178                 _pam_log_debug(pamh, ctrl, LOG_NOTICE, "user '%s' not found",
2179                                username);
2180                 if (ctrl & WINBIND_UNKNOWN_OK_ARG) {
2181                         ret = PAM_IGNORE;
2182                         goto out;
2183                 }
2184                 ret = PAM_USER_UNKNOWN;
2185                 goto out;
2186         case 0:
2187                 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2188                              (const void **)&tmp);
2189                 if (tmp != NULL) {
2190                         ret = atoi((const char *)tmp);
2191                         switch (ret) {
2192                         case PAM_AUTHTOK_EXPIRED:
2193                                 /* fall through, since new token is required in this case */
2194                         case PAM_NEW_AUTHTOK_REQD:
2195                                 _pam_log(pamh, ctrl, LOG_WARNING,
2196                                          "pam_sm_acct_mgmt success but %s is set",
2197                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
2198                                 _pam_log(pamh, ctrl, LOG_NOTICE,
2199                                          "user '%s' needs new password",
2200                                          username);
2201                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2202                                 ret = PAM_NEW_AUTHTOK_REQD;
2203                                 goto out;
2204                         default:
2205                                 _pam_log(pamh, ctrl, LOG_WARNING,
2206                                          "pam_sm_acct_mgmt success");
2207                                 _pam_log(pamh, ctrl, LOG_NOTICE,
2208                                          "user '%s' granted access", username);
2209                                 ret = PAM_SUCCESS;
2210                                 goto out;
2211                         }
2212                 }
2213
2214                 /* Otherwise, the authentication looked good */
2215                 _pam_log(pamh, ctrl, LOG_NOTICE,
2216                          "user '%s' granted access", username);
2217                 ret = PAM_SUCCESS;
2218                 goto out;
2219         default:
2220                 /* we don't know anything about this return value */
2221                 _pam_log(pamh, ctrl, LOG_ERR,
2222                          "internal module error (ret = %d, user = '%s')",
2223                          ret, username);
2224                 ret = PAM_SERVICE_ERR;
2225                 goto out;
2226         }
2227
2228         /* should not be reached */
2229         ret = PAM_IGNORE;
2230
2231  out:
2232
2233         if (d) {
2234                 iniparser_freedict(d);
2235         }
2236
2237         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", pamh, ctrl, ret);
2238
2239         return ret;
2240 }
2241
2242 PAM_EXTERN
2243 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2244                         int argc, const char **argv)
2245 {
2246         int ret = PAM_SYSTEM_ERR;
2247         dictionary *d = NULL;
2248
2249         /* parse arguments */
2250         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
2251         if (ctrl == -1) {
2252                 ret = PAM_SYSTEM_ERR;
2253                 goto out;
2254         }
2255
2256         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", pamh, ctrl, flags);
2257
2258         ret = PAM_SUCCESS;
2259
2260  out:
2261         if (d) {
2262                 iniparser_freedict(d);
2263         }
2264
2265         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", pamh, ctrl, ret);
2266
2267         return ret;
2268 }
2269
2270 PAM_EXTERN
2271 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2272                          int argc, const char **argv)
2273 {
2274         dictionary *d = NULL;
2275         int retval = PAM_SUCCESS;
2276
2277         /* parse arguments */
2278         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
2279         if (ctrl == -1) {
2280                 retval = PAM_SYSTEM_ERR;
2281                 goto out;
2282         }
2283
2284         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", pamh, ctrl, flags);
2285
2286         if (!(flags & PAM_DELETE_CRED)) {
2287                 retval = PAM_SUCCESS;
2288                 goto out;
2289         }
2290
2291         if (ctrl & WINBIND_KRB5_AUTH) {
2292
2293                 /* destroy the ccache here */
2294                 struct winbindd_request request;
2295                 struct winbindd_response response;
2296                 const char *user;
2297                 const char *ccname = NULL;
2298                 struct passwd *pwd = NULL;
2299
2300                 ZERO_STRUCT(request);
2301                 ZERO_STRUCT(response);
2302
2303                 retval = pam_get_user(pamh, &user, "Username: ");
2304                 if (retval) {
2305                         _pam_log(pamh, ctrl, LOG_ERR,
2306                                  "could not identify user");
2307                         goto out;
2308                 }
2309
2310                 if (user == NULL) {
2311                         _pam_log(pamh, ctrl, LOG_ERR,
2312                                  "username was NULL!");
2313                         retval = PAM_USER_UNKNOWN;
2314                         goto out;
2315                 }
2316
2317                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
2318                                "username [%s] obtained", user);
2319
2320                 ccname = pam_getenv(pamh, "KRB5CCNAME");
2321                 if (ccname == NULL) {
2322                         _pam_log_debug(pamh, ctrl, LOG_DEBUG,
2323                                        "user has no KRB5CCNAME environment");
2324                 }
2325
2326                 strncpy(request.data.logoff.user, user,
2327                         sizeof(request.data.logoff.user) - 1);
2328
2329                 if (ccname) {
2330                         strncpy(request.data.logoff.krb5ccname, ccname,
2331                                 sizeof(request.data.logoff.krb5ccname) - 1);
2332                 }
2333
2334                 pwd = getpwnam(user);
2335                 if (pwd == NULL) {
2336                         retval = PAM_USER_UNKNOWN;
2337                         goto out;
2338                 }
2339                 request.data.logoff.uid = pwd->pw_uid;
2340
2341                 request.flags = WBFLAG_PAM_KRB5 |
2342                                 WBFLAG_PAM_CONTACT_TRUSTDOM;
2343
2344                 retval = pam_winbind_request_log(pamh, ctrl,
2345                                                  WINBINDD_PAM_LOGOFF,
2346                                                  &request, &response, user);
2347         }
2348
2349 out:
2350         if (d) {
2351                 iniparser_freedict(d);
2352         }
2353
2354         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", pamh, ctrl, retval);
2355
2356         return retval;
2357 }
2358
2359 /**
2360  * evaluate whether we need to re-authenticate with kerberos after a
2361  * password change
2362  *
2363  * @param pamh PAM handle
2364  * @param ctrl PAM winbind options.
2365  * @param user The username
2366  *
2367  * @return boolean Returns true if required, false if not.
2368  */
2369
2370 static bool _pam_require_krb5_auth_after_chauthtok(pam_handle_t *pamh,
2371                                                    int ctrl,
2372                                                    const char *user)
2373 {
2374
2375         /* Make sure that we only do this if a) the chauthtok got initiated
2376          * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2377          * later password change via the "passwd" command if done by the user
2378          * itself */
2379
2380         char *new_authtok_reqd_during_auth = NULL;
2381         struct passwd *pwd = NULL;
2382
2383         if (!(ctrl & WINBIND_KRB5_AUTH)) {
2384                 return false;
2385         }
2386
2387         _pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2388                       &new_authtok_reqd_during_auth);
2389         pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2390                      NULL, NULL);
2391
2392         if (new_authtok_reqd_during_auth) {
2393                 return true;
2394         }
2395
2396         pwd = getpwnam(user);
2397         if (!pwd) {
2398                 return false;
2399         }
2400
2401         if (getuid() == pwd->pw_uid) {
2402                 return true;
2403         }
2404
2405         return false;
2406 }
2407
2408
2409 PAM_EXTERN
2410 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2411                      int argc, const char **argv)
2412 {
2413         unsigned int lctrl;
2414         int ret;
2415         unsigned int ctrl;
2416
2417         /* <DO NOT free() THESE> */
2418         const char *user;
2419         char *pass_old, *pass_new;
2420         /* </DO NOT free() THESE> */
2421
2422         char *Announce;
2423
2424         int retry = 0;
2425         dictionary *d = NULL;
2426         char *username_ret = NULL;
2427         struct winbindd_response response;
2428
2429         ZERO_STRUCT(response);
2430
2431         ctrl = _pam_parse(pamh, flags, argc, argv, &d);
2432         if (ctrl == -1) {
2433                 ret = PAM_SYSTEM_ERR;
2434                 goto out;
2435         }
2436
2437         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", pamh, ctrl, flags);
2438
2439         /* clearing offline bit for the auth in the password change */
2440         ctrl &= ~WINBIND_CACHED_LOGIN;
2441
2442         /*
2443          * First get the name of a user
2444          */
2445         ret = pam_get_user(pamh, &user, "Username: ");
2446         if (ret) {
2447                 _pam_log(pamh, ctrl, LOG_ERR,
2448                          "password - could not identify user");
2449                 goto out;
2450         }
2451
2452         if (user == NULL) {
2453                 _pam_log(pamh, ctrl, LOG_ERR, "username was NULL!");
2454                 ret = PAM_USER_UNKNOWN;
2455                 goto out;
2456         }
2457
2458         _pam_log_debug(pamh, ctrl, LOG_DEBUG, "username [%s] obtained", user);
2459
2460         /* check if this is really a user in winbindd, not only in NSS */
2461         ret = valid_user(pamh, ctrl, user);
2462         switch (ret) {
2463                 case 1:
2464                         ret = PAM_USER_UNKNOWN;
2465                         goto out;
2466                 case -1:
2467                         ret = PAM_SYSTEM_ERR;
2468                         goto out;
2469                 default:
2470                         break;
2471         }
2472
2473         /*
2474          * obtain and verify the current password (OLDAUTHTOK) for
2475          * the user.
2476          */
2477
2478         if (flags & PAM_PRELIM_CHECK) {
2479                 time_t pwdlastset_prelim = 0;
2480
2481                 /* instruct user what is happening */
2482 #define greeting "Changing password for "
2483                 Announce = (char *) malloc(sizeof(greeting) + strlen(user));
2484                 if (Announce == NULL) {
2485                         _pam_log(pamh, ctrl, LOG_CRIT,
2486                                  "password - out of memory");
2487                         ret = PAM_BUF_ERR;
2488                         goto out;
2489                 }
2490                 (void) strcpy(Announce, greeting);
2491                 (void) strcpy(Announce + sizeof(greeting) - 1, user);
2492 #undef greeting
2493
2494                 lctrl = ctrl | WINBIND__OLD_PASSWORD;
2495                 ret = _winbind_read_password(pamh, lctrl,
2496                                                 Announce,
2497                                                 "(current) NT password: ",
2498                                                 NULL,
2499                                                 (const char **) &pass_old);
2500                 if (ret != PAM_SUCCESS) {
2501                         _pam_log(pamh, ctrl, LOG_NOTICE,
2502                                  "password - (old) token not obtained");
2503                         goto out;
2504                 }
2505
2506                 /* verify that this is the password for this user */
2507
2508                 ret = winbind_auth_request(pamh, ctrl, user, pass_old,
2509                                            NULL, NULL, 0, &response,
2510                                            &pwdlastset_prelim, NULL);
2511
2512                 if (ret != PAM_ACCT_EXPIRED &&
2513                     ret != PAM_AUTHTOK_EXPIRED &&
2514                     ret != PAM_NEW_AUTHTOK_REQD &&
2515                     ret != PAM_SUCCESS) {
2516                         pass_old = NULL;
2517                         goto out;
2518                 }
2519
2520                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
2521                              (void *)pwdlastset_prelim, NULL);
2522
2523                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
2524                                    (const void *) pass_old);
2525                 pass_old = NULL;
2526                 if (ret != PAM_SUCCESS) {
2527                         _pam_log(pamh, ctrl, LOG_CRIT,
2528                                  "failed to set PAM_OLDAUTHTOK");
2529                 }
2530         } else if (flags & PAM_UPDATE_AUTHTOK) {
2531
2532                 time_t pwdlastset_update = 0;
2533
2534                 /*
2535                  * obtain the proposed password
2536                  */
2537
2538                 /*
2539                  * get the old token back.
2540                  */
2541
2542                 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
2543
2544                 if (ret != PAM_SUCCESS) {
2545                         _pam_log(pamh, ctrl, LOG_NOTICE,
2546                                  "user not authenticated");
2547                         goto out;
2548                 }
2549
2550                 lctrl = ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
2551
2552                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
2553                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
2554                 }
2555                 retry = 0;
2556                 ret = PAM_AUTHTOK_ERR;
2557                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
2558                         /*
2559                          * use_authtok is to force the use of a previously entered
2560                          * password -- needed for pluggable password strength checking
2561                          */
2562
2563                         ret = _winbind_read_password(pamh, lctrl,
2564                                                      NULL,
2565                                                      "Enter new NT password: ",
2566                                                      "Retype new NT password: ",
2567                                                      (const char **)&pass_new);
2568
2569                         if (ret != PAM_SUCCESS) {
2570                                 _pam_log_debug(pamh, ctrl, LOG_ALERT,
2571                                                "password - "
2572                                                "new password not obtained");
2573                                 pass_old = NULL;/* tidy up */
2574                                 goto out;
2575                         }
2576
2577                         /*
2578                          * At this point we know who the user is and what they
2579                          * propose as their new password. Verify that the new
2580                          * password is acceptable.
2581                          */
2582
2583                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
2584                                 pass_new = NULL;
2585                         }
2586                 }
2587
2588                 /*
2589                  * By reaching here we have approved the passwords and must now
2590                  * rebuild the password database file.
2591                  */
2592                 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
2593                               &pwdlastset_update);
2594
2595                 ret = winbind_chauthtok_request(pamh, ctrl, user, pass_old,
2596                                                 pass_new, pwdlastset_update);
2597                 if (ret) {
2598                         _pam_overwrite(pass_new);
2599                         _pam_overwrite(pass_old);
2600                         pass_old = pass_new = NULL;
2601                         goto out;
2602                 }
2603
2604                 if (_pam_require_krb5_auth_after_chauthtok(pamh, ctrl, user)) {
2605
2606                         const char *member = NULL;
2607                         const char *cctype = NULL;
2608                         int warn_pwd_expire;
2609
2610                         member = get_member_from_config(pamh, argc, argv,
2611                                                         ctrl, d);
2612                         cctype = get_krb5_cc_type_from_config(pamh, argc, argv,
2613                                                               ctrl, d);
2614                         warn_pwd_expire = get_warn_pwd_expire_from_config(pamh,
2615                                                                           argc,
2616                                                                           argv,
2617                                                                           ctrl,
2618                                                                           d);
2619
2620
2621                         ret = winbind_auth_request(pamh, ctrl, user, pass_new,
2622                                                    member, cctype, 0, &response,
2623                                                    NULL, &username_ret);
2624                         _pam_overwrite(pass_new);
2625                         _pam_overwrite(pass_old);
2626                         pass_old = pass_new = NULL;
2627
2628                         if (ret == PAM_SUCCESS) {
2629
2630                                 /* warn a user if the password is about to
2631                                  * expire soon */
2632                                 _pam_warn_password_expiry(pamh, ctrl, &response,
2633                                                           warn_pwd_expire,
2634                                                           NULL);
2635
2636                                 /* set some info3 info for other modules in the
2637                                  * stack */
2638                                 _pam_set_data_info3(pamh, ctrl, &response);
2639
2640                                 /* put krb5ccname into env */
2641                                 _pam_setup_krb5_env(pamh, ctrl,
2642                                                     response.data.auth.krb5ccname);
2643
2644                                 if (username_ret) {
2645                                         pam_set_item(pamh, PAM_USER,
2646                                                      username_ret);
2647                                         _pam_log_debug(pamh, ctrl, LOG_INFO,
2648                                                        "Returned user was '%s'",
2649                                                        username_ret);
2650                                         free(username_ret);
2651                                 }
2652                         }
2653
2654                         goto out;
2655                 }
2656         } else {
2657                 ret = PAM_SERVICE_ERR;
2658         }
2659
2660 out:
2661         if (d) {
2662                 iniparser_freedict(d);
2663         }
2664
2665         /* Deal with offline errors. */
2666         PAM_WB_REMARK_CHECK_RESPONSE(pamh, ctrl, response,
2667                                      "NT_STATUS_NO_LOGON_SERVERS");
2668         PAM_WB_REMARK_CHECK_RESPONSE(pamh, ctrl, response,
2669                                      "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
2670         PAM_WB_REMARK_CHECK_RESPONSE(pamh, ctrl, response,
2671                                      "NT_STATUS_ACCESS_DENIED");
2672
2673         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", pamh, ctrl, ret);
2674
2675         return ret;
2676 }
2677
2678 #ifdef PAM_STATIC
2679
2680 /* static module data */
2681
2682 struct pam_module _pam_winbind_modstruct = {
2683         MODULE_NAME,
2684         pam_sm_authenticate,
2685         pam_sm_setcred,
2686         pam_sm_acct_mgmt,
2687         pam_sm_open_session,
2688         pam_sm_close_session,
2689         pam_sm_chauthtok
2690 };
2691
2692 #endif
2693
2694 /*
2695  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
2696  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
2697  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
2698  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2007
2699  * Copyright (c) Jan Rêkorajski 1999.
2700  * Copyright (c) Andrew G. Morgan 1996-8.
2701  * Copyright (c) Alex O. Yuriev, 1996.
2702  * Copyright (c) Cristian Gafton 1996.
2703  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
2704  *
2705  * Redistribution and use in source and binary forms, with or without
2706  * modification, are permitted provided that the following conditions
2707  * are met:
2708  * 1. Redistributions of source code must retain the above copyright
2709  *    notice, and the entire permission notice in its entirety,
2710  *    including the disclaimer of warranties.
2711  * 2. Redistributions in binary form must reproduce the above copyright
2712  *    notice, this list of conditions and the following disclaimer in the
2713  *    documentation and/or other materials provided with the distribution.
2714  * 3. The name of the author may not be used to endorse or promote
2715  *    products derived from this software without specific prior
2716  *    written permission.
2717  *
2718  * ALTERNATIVELY, this product may be distributed under the terms of
2719  * the GNU Public License, in which case the provisions of the GPL are
2720  * required INSTEAD OF the above restrictions.  (This clause is
2721  * necessary due to a potential bad interaction between the GPL and
2722  * the restrictions contained in a BSD-style copyright.)
2723  *
2724  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
2725  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
2726  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
2727  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
2728  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
2729  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
2730  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2731  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
2732  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
2733  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
2734  * OF THE POSSIBILITY OF SUCH DAMAGE.
2735  */