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>
   9    also contains large slabs of code from pam_unix by Elliot Lee <sopwith@redhat.com>
  10    (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: 0x%08x] ENTER: " function " (flags: 0x%04x)", (uint32) pamh, flags); \
  18                 _pam_log_state(pamh, ctrl); \
  19         } while (0)
  20
  21 #define _PAM_LOG_FUNCTION_LEAVE(function, pamh, ctrl, retval) \
  22         do { \
  23                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "[pamh: 0x%08x] LEAVE: " function " returning %d", (uint32) pamh, retval); \
  24                 _pam_log_state(pamh, ctrl); \
  25         } while (0)
  26
  27 /* data tokens */
  28
  29 #define MAX_PASSWD_TRIES        3
  30
  31 /*
  32  * Work around the pam API that has functions with void ** as parameters.
  33  * These lead to strict aliasing warnings with gcc.
  34  */
  35 static int _pam_get_item(const pam_handle_t *pamh, int item_type,
  36                          const void *_item)
  37 {
  38         const void **item = (const void **)_item;
  39         return pam_get_item(pamh, item_type, item);
  40 }
  41 static int _pam_get_data(const pam_handle_t *pamh,
  42                          const char *module_data_name, const void *_data)
  43 {
  44         const void **data = (const void **)_data;
  45         return pam_get_data(pamh, module_data_name, data);
  46 }
  47
  48 /* some syslogging */
  49
  50 #ifdef HAVE_PAM_VSYSLOG
  51 static void _pam_log_int(const pam_handle_t *pamh, int err, const char *format, va_list args)
  52 {
  53         pam_vsyslog(pamh, err, format, args);
  54 }
  55 #else
  56 static void _pam_log_int(const pam_handle_t *pamh, int err, const char *format, va_list args)
  57 {
  58         char *format2 = NULL;
  59         const char *service;
  60
  61         _pam_get_item(pamh, PAM_SERVICE, &service);
  62
  63         format2 = malloc(strlen(MODULE_NAME)+strlen(format)+strlen(service)+5);
  64         if (format2 == NULL) {
  65                 /* what else todo ? */
  66                 vsyslog(err, format, args);
  67                 return;
  68         }
  69
  70         sprintf(format2, "%s(%s): %s", MODULE_NAME, service, format);
  71         vsyslog(err, format2, args);
  72         SAFE_FREE(format2);
  73 }
  74 #endif /* HAVE_PAM_VSYSLOG */
  75
  76 static BOOL _pam_log_is_silent(int ctrl)
  77 {
  78         return on(ctrl, WINBIND_SILENT);
  79 }
  80
  81 static void _pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
  82 {
  83         va_list args;
  84
  85         if (_pam_log_is_silent(ctrl)) {
  86                 return;
  87         }
  88
  89         va_start(args, format);
  90         _pam_log_int(pamh, err, format, args);
  91         va_end(args);
  92 }
  93
  94 static BOOL _pam_log_is_debug_enabled(int ctrl)
  95 {
  96         if (ctrl == -1) {
  97                 return False;
  98         }
  99
 100         if (_pam_log_is_silent(ctrl)) {
 101                 return False;
 102         }
 103
 104         if (!(ctrl & WINBIND_DEBUG_ARG)) {
 105                 return False;
 106         }
 107
 108         return True;
 109 }
 110
 111 static BOOL _pam_log_is_debug_state_enabled(int ctrl)
 112 {
 113         if (!(ctrl & WINBIND_DEBUG_STATE)) {
 114                 return False;
 115         }
 116
 117         return _pam_log_is_debug_enabled(ctrl);
 118 }
 119
 120 static void _pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 121 {
 122         va_list args;
 123
 124         if (!_pam_log_is_debug_enabled(ctrl)) {
 125                 return;
 126         }
 127
 128         va_start(args, format);
 129         _pam_log_int(pamh, err, format, args);
 130         va_end(args);
 131 }
 132
 133 static void _pam_log_state_datum(const pam_handle_t *pamh, int ctrl, int item_type, const char *key, int is_string)
 134 {
 135         const void *data = NULL;
 136         if (item_type != 0) {
 137                 pam_get_item(pamh, item_type, &data);
 138         } else {
 139                 pam_get_data(pamh, key, &data);
 140         }
 141         if (data != NULL) {
 142                 const char *type = (item_type != 0) ? "ITEM" : "DATA";
 143                 if (is_string != 0) {
 144                         _pam_log_debug(pamh, ctrl, LOG_DEBUG, "[pamh: 0x%08x] STATE: %s(%s) = \"%s\" (0x%08x)", (uint32) pamh, type, key, (const char *) data, (uint32) data);
 145                 } else {
 146                         _pam_log_debug(pamh, ctrl, LOG_DEBUG, "[pamh: 0x%08x] STATE: %s(%s) = 0x%08x", (uint32) pamh, type, key, (uint32) data);
 147                 }
 148         }
 149 }
 150
 151 #define _PAM_LOG_STATE_DATA_POINTER(pamh, ctrl, module_data_name) \
 152         _pam_log_state_datum(pamh, ctrl, 0, module_data_name, 0)
 153
 154 #define _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, module_data_name) \
 155         _pam_log_state_datum(pamh, ctrl, 0, module_data_name, 1)
 156
 157 #define _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, item_type) \
 158         _pam_log_state_datum(pamh, ctrl, item_type, #item_type, 0)
 159
 160 #define _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, item_type) \
 161         _pam_log_state_datum(pamh, ctrl, item_type, #item_type, 1)
 162
 163 #ifdef DEBUG_PASSWORD
 164 #define _LOG_PASSWORD_AS_STRING 1
 165 #else
 166 #define _LOG_PASSWORD_AS_STRING 0
 167 #endif
 168
 169 #define _PAM_LOG_STATE_ITEM_PASSWORD(pamh, ctrl, item_type) \
 170         _pam_log_state_datum(pamh, ctrl, item_type, #item_type, _LOG_PASSWORD_AS_STRING)
 171
 172 static void _pam_log_state(const pam_handle_t *pamh, int ctrl)
 173 {
 174         if (!_pam_log_is_debug_state_enabled(ctrl)) {
 175                 return;
 176         }
 177
 178         _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_SERVICE);
 179         _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_USER);
 180         _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_TTY);
 181         _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_RHOST);
 182         _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_RUSER);
 183         _PAM_LOG_STATE_ITEM_PASSWORD(pamh, ctrl, PAM_OLDAUTHTOK);
 184         _PAM_LOG_STATE_ITEM_PASSWORD(pamh, ctrl, PAM_AUTHTOK);
 185         _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_USER_PROMPT);
 186         _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, PAM_CONV);
 187 #ifdef PAM_FAIL_DELAY
 188         _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, PAM_FAIL_DELAY);
 189 #endif
 190 #ifdef PAM_REPOSITORY
 191         _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, PAM_REPOSITORY);
 192 #endif
 193
 194         _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_HOMEDIR);
 195         _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_LOGONSCRIPT);
 196         _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_PROFILEPATH);
 197         _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_NEW_AUTHTOK_REQD); /* Use atoi to get PAM result code */
 198         _PAM_LOG_STATE_DATA_POINTER(pamh, ctrl, PAM_WINBIND_PWD_LAST_SET);
 199 }
 200
 201 static int _pam_parse(const pam_handle_t *pamh, int flags, int argc, const char **argv, dictionary **result_d)
 202 {
 203         int ctrl = 0;
 204         const char *config_file = NULL;
 205         int i;
 206         const char **v;
 207         dictionary *d = NULL;
 208
 209         if (flags & PAM_SILENT) {
 210                 ctrl |= WINBIND_SILENT;
 211         }
 212
 213         for (i=argc,v=argv; i-- > 0; ++v) {
 214                 if (!strncasecmp(*v, "config", strlen("config"))) {
 215                         ctrl |= WINBIND_CONFIG_FILE;
 216                         config_file = v[i];
 217                         break;
 218                 }
 219         }
 220
 221         if (config_file == NULL) {
 222                 config_file = PAM_WINBIND_CONFIG_FILE;
 223         }
 224
 225         d = iniparser_load(config_file);
 226         if (d == NULL) {
 227                 goto config_from_pam;
 228         }
 229
 230         if (iniparser_getboolean(d, "global:debug", False)) {
 231                 ctrl |= WINBIND_DEBUG_ARG;
 232         }
 233
 234         if (iniparser_getboolean(d, "global:debug_state", False)) {
 235                 ctrl |= WINBIND_DEBUG_STATE;
 236         }
 237
 238         if (iniparser_getboolean(d, "global:cached_login", False)) {
 239                 ctrl |= WINBIND_CACHED_LOGIN;
 240         }
 241
 242         if (iniparser_getboolean(d, "global:krb5_auth", False)) {
 243                 ctrl |= WINBIND_KRB5_AUTH;
 244         }
 245
 246         if (iniparser_getboolean(d, "global:silent", False)) {
 247                 ctrl |= WINBIND_SILENT;
 248         }
 249
 250         if (iniparser_getstr(d, "global:krb5_ccache_type") != NULL) {
 251                 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 252         }
 253
 254         if ((iniparser_getstr(d, "global:require-membership-of") != NULL) ||
 255             (iniparser_getstr(d, "global:require_membership_of") != NULL)) {
 256                 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 257         }
 258
 259         if (iniparser_getboolean(d, "global:try_first_pass", False)) {
 260                 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 261         }
 262
 263 config_from_pam:
 264         /* step through arguments */
 265         for (i=argc,v=argv; i-- > 0; ++v) {
 266
 267                 /* generic options */
 268                 if (!strcmp(*v,"debug"))
 269                         ctrl |= WINBIND_DEBUG_ARG;
 270                 else if (!strcasecmp(*v, "debug_state"))
 271                         ctrl |= WINBIND_DEBUG_STATE;
 272                 else if (!strcasecmp(*v, "use_authtok"))
 273                         ctrl |= WINBIND_USE_AUTHTOK_ARG;
 274                 else if (!strcasecmp(*v, "use_first_pass"))
 275                         ctrl |= WINBIND_USE_FIRST_PASS_ARG;
 276                 else if (!strcasecmp(*v, "try_first_pass"))
 277                         ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 278                 else if (!strcasecmp(*v, "unknown_ok"))
 279                         ctrl |= WINBIND_UNKNOWN_OK_ARG;
 280                 else if (!strncasecmp(*v, "require_membership_of", strlen("require_membership_of")))
 281                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 282                 else if (!strncasecmp(*v, "require-membership-of", strlen("require-membership-of")))
 283                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 284                 else if (!strcasecmp(*v, "krb5_auth"))
 285                         ctrl |= WINBIND_KRB5_AUTH;
 286                 else if (!strncasecmp(*v, "krb5_ccache_type", strlen("krb5_ccache_type")))
 287                         ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 288                 else if (!strcasecmp(*v, "cached_login"))
 289                         ctrl |= WINBIND_CACHED_LOGIN;
 290                 else {
 291                         _pam_log(pamh, ctrl, LOG_ERR, "pam_parse: unknown option: %s", *v);
 292                         return -1;
 293                 }
 294
 295         }
 296
 297         if (result_d) {
 298                 *result_d = d;
 299         } else {
 300                 if (d) {
 301                         iniparser_freedict(d);
 302                 }
 303         }
 304
 305         return ctrl;
 306 };
 307
 308 static void _pam_winbind_cleanup_func(pam_handle_t *pamh, void *data, int error_status)
 309 {
 310         int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
 311         if (_pam_log_is_debug_state_enabled(ctrl)) {
 312                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "[pamh: 0x%08x] CLEAN: cleaning up PAM data 0x%08x (error_status = %d)", (uint32) pamh, (uint32) data, error_status);
 313         }
 314         SAFE_FREE(data);
 315 }
 316
 317
 318 static const struct ntstatus_errors {
 319         const char *ntstatus_string;
 320         const char *error_string;
 321 } ntstatus_errors[] = {
 322         {"NT_STATUS_OK", "Success"},
 323         {"NT_STATUS_BACKUP_CONTROLLER", "No primary Domain Controler available"},
 324         {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND", "No domain controllers found"},
 325         {"NT_STATUS_NO_LOGON_SERVERS", "No logon servers"},
 326         {"NT_STATUS_PWD_TOO_SHORT", "Password too short"},
 327         {"NT_STATUS_PWD_TOO_RECENT", "The password of this user is too recent to change"},
 328         {"NT_STATUS_PWD_HISTORY_CONFLICT", "Password is already in password history"},
 329         {"NT_STATUS_PASSWORD_EXPIRED", "Your password has expired"},
 330         {"NT_STATUS_PASSWORD_MUST_CHANGE", "You need to change your password now"},
 331         {"NT_STATUS_INVALID_WORKSTATION", "You are not allowed to logon from this workstation"},
 332         {"NT_STATUS_INVALID_LOGON_HOURS", "You are not allowed to logon at this time"},
 333         {"NT_STATUS_ACCOUNT_EXPIRED", "Your account has expired. Please contact your System administrator"}, /* SCNR */
 334         {"NT_STATUS_ACCOUNT_DISABLED", "Your account is disabled. Please contact your System administrator"}, /* SCNR */
 335         {"NT_STATUS_ACCOUNT_LOCKED_OUT", "Your account has been locked. Please contact your System administrator"}, /* SCNR */
 336         {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT", "Invalid Trust Account"},
 337         {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT", "Invalid Trust Account"},
 338         {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT", "Invalid Trust Account"},
 339         {"NT_STATUS_ACCESS_DENIED", "Access is denied"},
 340         {NULL, NULL}
 341 };
 342
 343 const char *_get_ntstatus_error_string(const char *nt_status_string)
 344 {
 345         int i;
 346         for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
 347                 if (!strcasecmp(ntstatus_errors[i].ntstatus_string, nt_status_string)) {
 348                         return ntstatus_errors[i].error_string;
 349                 }
 350         }
 351         return NULL;
 352 }
 353
 354 /* --- authentication management functions --- */
 355
 356 /* Attempt a conversation */
 357
 358 static int converse(pam_handle_t *pamh, int nargs,
 359                     struct pam_message **message,
 360                     struct pam_response **response)
 361 {
 362         int retval;
 363         struct pam_conv *conv;
 364
 365         retval = _pam_get_item(pamh, PAM_CONV, &conv );
 366         if (retval == PAM_SUCCESS) {
 367                 retval = conv->conv(nargs, (const struct pam_message **)message,
 368                                     response, conv->appdata_ptr);
 369         }
 370
 371         return retval; /* propagate error status */
 372 }
 373
 374
 375 static int _make_remark(pam_handle_t * pamh, int type, const char *text)
 376 {
 377         int retval = PAM_SUCCESS;
 378
 379         struct pam_message *pmsg[1], msg[1];
 380         struct pam_response *resp;
 381
 382         pmsg[0] = &msg[0];
 383         msg[0].msg = CONST_DISCARD(char *, text);
 384         msg[0].msg_style = type;
 385
 386         resp = NULL;
 387         retval = converse(pamh, 1, pmsg, &resp);
 388
 389         if (resp) {
 390                 _pam_drop_reply(resp, 1);
 391         }
 392         return retval;
 393 }
 394
 395 static int _make_remark_v(pam_handle_t * pamh, int type, const char *format, va_list args)
 396 {
 397         char *var;
 398         int ret;
 399
 400         ret = vasprintf(&var, format, args);
 401         if (ret < 0) {
 402                 _pam_log(pamh, 0, LOG_ERR, "memory allocation failure");
 403                 return ret;
 404         }
 405
 406         ret = _make_remark(pamh, type, var);
 407         SAFE_FREE(var);
 408         return ret;
 409 }
 410
 411 static int _make_remark_format(pam_handle_t * pamh, int type, const char *format, ...)
 412 {
 413         int ret;
 414         va_list args;
 415
 416         va_start(args, format);
 417         ret = _make_remark_v(pamh, type, format, args);
 418         va_end(args);
 419         return ret;
 420 }
 421
 422 static int pam_winbind_request(pam_handle_t * pamh, int ctrl,
 423                                enum winbindd_cmd req_type,
 424                                struct winbindd_request *request,
 425                                struct winbindd_response *response)
 426 {
 427         /* Fill in request and send down pipe */
 428         init_request(request, req_type);
 429
 430         if (write_sock(request, sizeof(*request), 0) == -1) {
 431                 _pam_log(pamh, ctrl, LOG_ERR, "pam_winbind_request: write to socket failed!");
 432                 close_sock();
 433                 return PAM_SERVICE_ERR;
 434         }
 435
 436         /* Wait for reply */
 437         if (read_reply(response) == -1) {
 438                 _pam_log(pamh, ctrl, LOG_ERR, "pam_winbind_request: read from socket failed!");
 439                 close_sock();
 440                 return PAM_SERVICE_ERR;
 441         }
 442
 443         /* We are done with the socket - close it and avoid mischeif */
 444         close_sock();
 445
 446         /* Copy reply data from socket */
 447         if (response->result == WINBINDD_OK) {
 448                 return PAM_SUCCESS;
 449         }
 450
 451         /* no need to check for pam_error codes for getpwnam() */
 452         switch (req_type) {
 453
 454                 case WINBINDD_GETPWNAM:
 455                 case WINBINDD_LOOKUPNAME:
 456                         _pam_log(pamh, ctrl, LOG_ERR, "request failed: %s, NT error was %s",
 457                                 response->data.auth.nt_status_string);
 458                         return PAM_USER_UNKNOWN;
 459                 default:
 460                         break;
 461         }
 462
 463         if (response->data.auth.pam_error != PAM_SUCCESS) {
 464                 _pam_log(pamh, ctrl, LOG_ERR, "request failed: %s, PAM error was %s (%d), NT error was %s",
 465                          response->data.auth.error_string,
 466                          pam_strerror(pamh, response->data.auth.pam_error),
 467                          response->data.auth.pam_error,
 468                          response->data.auth.nt_status_string);
 469                 return response->data.auth.pam_error;
 470         }
 471
 472         _pam_log(pamh, ctrl, LOG_ERR, "request failed, but PAM error 0!");
 473
 474         return PAM_SERVICE_ERR;
 475 }
 476
 477 static int pam_winbind_request_log(pam_handle_t * pamh,
 478                                    int ctrl,
 479                                    enum winbindd_cmd req_type,
 480                                    struct winbindd_request *request,
 481                                    struct winbindd_response *response,
 482                                    const char *user)
 483 {
 484         int retval;
 485
 486         retval = pam_winbind_request(pamh, ctrl, req_type, request, response);
 487
 488         switch (retval) {
 489         case PAM_AUTH_ERR:
 490                 /* incorrect password */
 491                 _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' denied access (incorrect password or invalid membership)", user);
 492                 return retval;
 493         case PAM_ACCT_EXPIRED:
 494                 /* account expired */
 495                 _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' account expired", user);
 496                 return retval;
 497         case PAM_AUTHTOK_EXPIRED:
 498                 /* password expired */
 499                 _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' password expired", user);
 500                 return retval;
 501         case PAM_NEW_AUTHTOK_REQD:
 502                 /* new password required */
 503                 _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' new password required", user);
 504                 return retval;
 505         case PAM_USER_UNKNOWN:
 506                 /* the user does not exist */
 507                 _pam_log_debug(pamh, ctrl, LOG_NOTICE, "user '%s' not found", user);
 508                 if (ctrl & WINBIND_UNKNOWN_OK_ARG) {
 509                         return PAM_IGNORE;
 510                 }
 511                 return retval;
 512         case PAM_SUCCESS:
 513                 if (req_type == WINBINDD_PAM_AUTH) {
 514                         /* Otherwise, the authentication looked good */
 515                         _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' granted access", user);
 516                 } else if (req_type == WINBINDD_PAM_CHAUTHTOK) {
 517                         /* Otherwise, the authentication looked good */
 518                         _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' password changed", user);
 519                 } else {
 520                         /* Otherwise, the authentication looked good */
 521                         _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' OK", user);
 522                 }
 523
 524                 return retval;
 525         default:
 526                 /* we don't know anything about this return value */
 527                 _pam_log(pamh, ctrl, LOG_ERR, "internal module error (retval = %d, user = '%s')",
 528                          retval, user);
 529                 return retval;
 530         }
 531 }
 532
 533 static BOOL _pam_send_password_expiry_message(pam_handle_t *pamh, time_t next_change, time_t now)
 534 {
 535         int days = 0;
 536         struct tm tm_now, tm_next_change;
 537
 538         if ((next_change < 0) ||
 539             (next_change < now) ||
 540             (next_change > now + DAYS_TO_WARN_BEFORE_PWD_EXPIRES * SECONDS_PER_DAY)) {
 541                 return False;
 542         }
 543
 544         if ((localtime_r(&now, &tm_now) == NULL) ||
 545             (localtime_r(&next_change, &tm_next_change) == NULL)) {
 546                 return False;
 547         }
 548
 549         days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) - (tm_now.tm_yday+tm_now.tm_year*365);
 550
 551         if (days == 0) {
 552                 _make_remark(pamh, PAM_TEXT_INFO, "Your password expires today");
 553                 return True;
 554         }
 555
 556         if (days > 0 && days < DAYS_TO_WARN_BEFORE_PWD_EXPIRES) {
 557                 _make_remark_format(pamh, PAM_TEXT_INFO, "Your password will expire in %d %s",
 558                         days, (days > 1) ? "days":"day");
 559                 return True;
 560         }
 561
 562         return False;
 563 }
 564
 565 static void _pam_warn_password_expires_in_future(pam_handle_t *pamh, struct winbindd_response *response)
 566 {
 567         time_t now = time(NULL);
 568         time_t next_change = 0;
 569
 570         /* accounts with ACB_PWNOEXP set never receive a warning */
 571         if (response->data.auth.info3.acct_flags & ACB_PWNOEXP) {
 572                 return;
 573         }
 574
 575         /* no point in sending a warning if this is a grace logon */
 576         if (PAM_WB_GRACE_LOGON(response->data.auth.info3.user_flgs)) {
 577                 return;
 578         }
 579
 580         /* check if the info3 must change timestamp has been set */
 581         next_change = response->data.auth.info3.pass_must_change_time;
 582
 583         if (_pam_send_password_expiry_message(pamh, next_change, now)) {
 584                 return;
 585         }
 586
 587         /* now check for the global password policy */
 588         if (response->data.auth.policy.expire <= 0) {
 589                 return;
 590         }
 591
 592         next_change = response->data.auth.info3.pass_last_set_time +
 593                       response->data.auth.policy.expire;
 594
 595         if (_pam_send_password_expiry_message(pamh, next_change, now)) {
 596                 return;
 597         }
 598
 599         /* no warning sent */
 600 }
 601
 602 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
 603
 604 int safe_append_string(char *dest,
 605                         const char *src,
 606                         int dest_buffer_size)
 607 /**
 608  * Append a string, making sure not to overflow and to always return a NULL-terminated
 609  * string.
 610  *
 611  * @param dest Destination string buffer (must already be NULL-terminated).
 612  * @param src Source string buffer.
 613  * @param dest_buffer_size Size of dest buffer in bytes.
 614  *
 615  * @return 0 if dest buffer is not big enough (no bytes copied), non-zero on success.
 616  */
 617 {
 618         int dest_length = strlen(dest);
 619         int src_length = strlen(src);
 620
 621         if ( dest_length + src_length + 1 > dest_buffer_size ) {
 622                 return 0;
 623         }
 624
 625         memcpy(dest + dest_length, src, src_length + 1);
 626         return 1;
 627 }
 628
 629 static int winbind_name_to_sid_string(pam_handle_t *pamh,
 630                                 int ctrl,
 631                                 const char *user,
 632                                 const char *name,
 633                                 char *sid_list_buffer,
 634                                 int sid_list_buffer_size)
 635 /**
 636  * Convert a names into a SID string, appending it to a buffer.
 637  *
 638  * @param pamh PAM handle
 639  * @param ctrl PAM winbind options.
 640  * @param user User in PAM request.
 641  * @param name Name to convert.
 642  * @param sid_list_buffer Where to append the string sid.
 643  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
 644  *
 645  * @return 0 on failure, non-zero on success.
 646  */
 647 {
 648         const char* sid_string;
 649         struct winbindd_response sid_response;
 650
 651         /* lookup name? */
 652         if (IS_SID_STRING(name)) {
 653                 sid_string = name;
 654         } else {
 655                 struct winbindd_request sid_request;
 656
 657                 ZERO_STRUCT(sid_request);
 658                 ZERO_STRUCT(sid_response);
 659
 660                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "no sid given, looking up: %s\n", name);
 661
 662                 /* fortunatly winbindd can handle non-separated names */
 663                 strncpy(sid_request.data.name.name, name,
 664                         sizeof(sid_request.data.name.name) - 1);
 665
 666                 if (pam_winbind_request_log(pamh, ctrl, WINBINDD_LOOKUPNAME, &sid_request, &sid_response, user)) {
 667                         _pam_log(pamh, ctrl, LOG_INFO, "could not lookup name: %s\n", name);
 668                         return 0;
 669                 }
 670
 671                 sid_string = sid_response.data.sid.sid;
 672         }
 673
 674         if (!safe_append_string(sid_list_buffer, sid_string, sid_list_buffer_size)) {
 675                 return 0;
 676         }
 677
 678         return 1;
 679 }
 680
 681 static int winbind_name_list_to_sid_string_list(pam_handle_t *pamh,
 682                                 int ctrl,
 683                                 const char *user,
 684                                 const char *name_list,
 685                                 char *sid_list_buffer,
 686                                 int sid_list_buffer_size)
 687 /**
 688  * Convert a list of names into a list of sids.
 689  *
 690  * @param pamh PAM handle
 691  * @param ctrl PAM winbind options.
 692  * @param user User in PAM request.
 693  * @param name_list List of names or string sids, separated by commas.
 694  * @param sid_list_buffer Where to put the list of string sids.
 695  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
 696  *
 697  * @return 0 on failure, non-zero on success.
 698  */
 699 {
 700         int result = 0;
 701         char *current_name = NULL;
 702         const char *search_location;
 703         const char *comma;
 704
 705         if ( sid_list_buffer_size > 0 ) {
 706                 sid_list_buffer[0] = 0;
 707         }
 708
 709         search_location = name_list;
 710         while ( (comma = strstr(search_location, ",")) != NULL ) {
 711                 current_name = strndup(search_location, comma - search_location);
 712                 if (NULL == current_name) {
 713                         goto out;
 714                 }
 715
 716                 if (!winbind_name_to_sid_string(pamh, ctrl, user, current_name, sid_list_buffer, sid_list_buffer_size)) {
 717                         goto out;
 718                 }
 719
 720                 SAFE_FREE(current_name);
 721
 722                 if (!safe_append_string(sid_list_buffer, ",", sid_list_buffer_size)) {
 723                         goto out;
 724                 }
 725
 726                 search_location = comma + 1;
 727         }
 728
 729         if (!winbind_name_to_sid_string(pamh, ctrl, user, search_location, sid_list_buffer, sid_list_buffer_size)) {
 730                 goto out;
 731         }
 732
 733         result = 1;
 734
 735 out:
 736         SAFE_FREE(current_name);
 737         return result;
 738 }
 739
 740 /* talk to winbindd */
 741 static int winbind_auth_request(pam_handle_t * pamh,
 742                                 int ctrl,
 743                                 const char *user,
 744                                 const char *pass,
 745                                 const char *member,
 746                                 const char *cctype,
 747                                 struct winbindd_response *p_response,
 748                                 time_t *pwd_last_set,
 749                                 char **user_ret)
 750 {
 751         struct winbindd_request request;
 752         struct winbindd_response response;
 753         int ret;
 754
 755         ZERO_STRUCT(request);
 756         ZERO_STRUCT(response);
 757
 758         if (pwd_last_set) {
 759                 *pwd_last_set = 0;
 760         }
 761
 762         strncpy(request.data.auth.user, user,
 763                 sizeof(request.data.auth.user)-1);
 764
 765         strncpy(request.data.auth.pass, pass,
 766                 sizeof(request.data.auth.pass)-1);
 767
 768         request.data.auth.krb5_cc_type[0] = '\0';
 769         request.data.auth.uid = -1;
 770
 771         request.flags = WBFLAG_PAM_INFO3_TEXT | WBFLAG_PAM_CONTACT_TRUSTDOM;
 772
 773         if (ctrl & WINBIND_KRB5_AUTH) {
 774
 775                 struct passwd *pwd = NULL;
 776
 777                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "enabling krb5 login flag\n");
 778
 779                 request.flags |= WBFLAG_PAM_KRB5 | WBFLAG_PAM_FALLBACK_AFTER_KRB5;
 780
 781                 pwd = getpwnam(user);
 782                 if (pwd == NULL) {
 783                         return PAM_USER_UNKNOWN;
 784                 }
 785                 request.data.auth.uid = pwd->pw_uid;
 786         }
 787
 788         if (ctrl & WINBIND_CACHED_LOGIN) {
 789                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "enabling cached login flag\n");
 790                 request.flags |= WBFLAG_PAM_CACHED_LOGIN;
 791         }
 792
 793         if (user_ret) {
 794                 *user_ret = NULL;
 795                 request.flags |= WBFLAG_PAM_UNIX_NAME;
 796         }
 797
 798         if (cctype != NULL) {
 799                 strncpy(request.data.auth.krb5_cc_type, cctype,
 800                         sizeof(request.data.auth.krb5_cc_type) - 1);
 801                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "enabling request for a %s krb5 ccache\n", cctype);
 802         }
 803
 804         request.data.auth.require_membership_of_sid[0] = '\0';
 805
 806         if (member != NULL) {
 807
 808                 if (!winbind_name_list_to_sid_string_list(pamh, ctrl, user, member,
 809                         request.data.auth.require_membership_of_sid,
 810                         sizeof(request.data.auth.require_membership_of_sid))) {
 811
 812                         _pam_log_debug(pamh, ctrl, LOG_ERR, "failed to serialize membership of sid \"%s\"\n", member);
 813                         return PAM_AUTH_ERR;
 814                 }
 815         }
 816
 817         ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_AUTH, &request, &response, user);
 818
 819         if (pwd_last_set) {
 820                 *pwd_last_set = response.data.auth.info3.pass_last_set_time;
 821         }
 822
 823         if ((ctrl & WINBIND_KRB5_AUTH) &&
 824             response.data.auth.krb5ccname[0] != '\0') {
 825
 826                 char var[PATH_MAX];
 827
 828                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "request returned KRB5CCNAME: %s",
 829                                response.data.auth.krb5ccname);
 830
 831                 snprintf(var, sizeof(var), "KRB5CCNAME=%s", response.data.auth.krb5ccname);
 832
 833                 ret = pam_putenv(pamh, var);
 834                 if (ret != PAM_SUCCESS) {
 835                         _pam_log(pamh, ctrl, LOG_ERR, "failed to set KRB5CCNAME to %s", var);
 836                         return ret;
 837                 }
 838         }
 839
 840         if (p_response) {
 841                 /* We want to process the response in the caller. */
 842                 *p_response = response;
 843                 return ret;
 844         }
 845
 846         if (ret) {
 847                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PASSWORD_EXPIRED");
 848                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PASSWORD_MUST_CHANGE");
 849                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_INVALID_WORKSTATION");
 850                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_INVALID_LOGON_HOURS");
 851                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_ACCOUNT_EXPIRED");
 852                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_ACCOUNT_DISABLED");
 853                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_ACCOUNT_LOCKED_OUT");
 854                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT");
 855                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT");
 856                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT");
 857                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
 858                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_NO_LOGON_SERVERS");
 859         }
 860
 861         /* handle the case where the auth was ok, but the password must expire right now */
 862         /* good catch from Ralf Haferkamp: an expiry of "never" is translated to -1 */
 863         if ( ! (response.data.auth.info3.acct_flags & ACB_PWNOEXP) &&
 864              ! (PAM_WB_GRACE_LOGON(response.data.auth.info3.user_flgs)) &&
 865             (response.data.auth.policy.expire > 0) &&
 866             (response.data.auth.info3.pass_last_set_time + response.data.auth.policy.expire < time(NULL))) {
 867
 868                 ret = PAM_AUTHTOK_EXPIRED;
 869
 870                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,"Password has expired (Password was last set: %d, "
 871                                "the policy says it should expire here %d (now it's: %d)\n",
 872                                response.data.auth.info3.pass_last_set_time,
 873                                response.data.auth.info3.pass_last_set_time + response.data.auth.policy.expire,
 874                                time(NULL));
 875
 876                 PAM_WB_REMARK_DIRECT_RET(pamh, "NT_STATUS_PASSWORD_EXPIRED");
 877
 878         }
 879
 880         /* warn a user if the password is about to expire soon */
 881         _pam_warn_password_expires_in_future(pamh, &response);
 882
 883         /* inform about logon type */
 884         if (PAM_WB_GRACE_LOGON(response.data.auth.info3.user_flgs)) {
 885
 886                 _make_remark(pamh, PAM_ERROR_MSG,
 887                         "Grace login. Please change your password as soon you're online again");
 888                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
 889                         "User %s logged on using grace logon\n", user);
 890
 891         } else if (PAM_WB_CACHED_LOGON(response.data.auth.info3.user_flgs)) {
 892
 893                 _make_remark(pamh, PAM_ERROR_MSG,
 894                         "Logging on using cached account. Network resources can be unavailable");
 895                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
 896                         "User %s logged on using cached account\n", user);
 897         }
 898
 899         /* save the CIFS homedir for pam_cifs / pam_mount */
 900         if (response.data.auth.info3.home_dir[0] != '\0') {
 901
 902                 int ret2 = pam_set_data(pamh, PAM_WINBIND_HOMEDIR,
 903                                         (void *) strdup(response.data.auth.info3.home_dir),
 904                                         _pam_winbind_cleanup_func);
 905                 if (ret2) {
 906                         _pam_log_debug(pamh, ctrl, LOG_DEBUG, "Could not set data: %s",
 907                                        pam_strerror(pamh, ret2));
 908                 }
 909
 910         }
 911
 912         /* save the logon script path for other PAM modules */
 913         if (response.data.auth.info3.logon_script[0] != '\0') {
 914
 915                 int ret2 = pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT,
 916                                         (void *) strdup(response.data.auth.info3.logon_script),
 917                                         _pam_winbind_cleanup_func);
 918                 if (ret2) {
 919                         _pam_log_debug(pamh, ctrl, LOG_DEBUG, "Could not set data: %s",
 920                                        pam_strerror(pamh, ret2));
 921                 }
 922         }
 923
 924         /* save the profile path for other PAM modules */
 925         if (response.data.auth.info3.profile_path[0] != '\0') {
 926
 927                 int ret2 = pam_set_data(pamh, PAM_WINBIND_PROFILEPATH,
 928                                         (void *) strdup(response.data.auth.info3.profile_path),
 929                                         _pam_winbind_cleanup_func);
 930                 if (ret2) {
 931                         _pam_log_debug(pamh, ctrl, LOG_DEBUG, "Could not set data: %s",
 932                                        pam_strerror(pamh, ret2));
 933                 }
 934         }
 935
 936         /* If winbindd returned a username, return the pointer to it here. */
 937         if (user_ret && response.extra_data.data) {
 938                 /* We have to trust it's a null terminated string. */
 939                 *user_ret = (char *)response.extra_data.data;
 940         }
 941
 942         return ret;
 943 }
 944
 945 /* talk to winbindd */
 946 static int winbind_chauthtok_request(pam_handle_t * pamh,
 947                                      int ctrl,
 948                                      const char *user,
 949                                      const char *oldpass,
 950                                      const char *newpass,
 951                                      time_t pwd_last_set)
 952 {
 953         struct winbindd_request request;
 954         struct winbindd_response response;
 955         int ret;
 956
 957         ZERO_STRUCT(request);
 958         ZERO_STRUCT(response);
 959
 960         if (request.data.chauthtok.user == NULL) return -2;
 961
 962         strncpy(request.data.chauthtok.user, user,
 963                 sizeof(request.data.chauthtok.user) - 1);
 964
 965         if (oldpass != NULL) {
 966                 strncpy(request.data.chauthtok.oldpass, oldpass,
 967                         sizeof(request.data.chauthtok.oldpass) - 1);
 968         } else {
 969                 request.data.chauthtok.oldpass[0] = '\0';
 970         }
 971
 972         if (newpass != NULL) {
 973                 strncpy(request.data.chauthtok.newpass, newpass,
 974                         sizeof(request.data.chauthtok.newpass) - 1);
 975         } else {
 976                 request.data.chauthtok.newpass[0] = '\0';
 977         }
 978
 979         if (ctrl & WINBIND_KRB5_AUTH) {
 980                 request.flags = WBFLAG_PAM_KRB5 | WBFLAG_PAM_CONTACT_TRUSTDOM;
 981         }
 982
 983         ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_CHAUTHTOK, &request, &response, user);
 984
 985         if (ret == PAM_SUCCESS) {
 986                 return ret;
 987         }
 988
 989         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_BACKUP_CONTROLLER");
 990         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
 991         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_NO_LOGON_SERVERS");
 992         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_ACCESS_DENIED");
 993
 994         /* TODO: tell the min pwd length ? */
 995         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PWD_TOO_SHORT");
 996
 997         /* TODO: tell the minage ? */
 998         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PWD_TOO_RECENT");
 999
1000         /* TODO: tell the history length ? */
1001         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PWD_HISTORY_CONFLICT");
1002
1003         if (!strcasecmp(response.data.auth.nt_status_string, "NT_STATUS_PASSWORD_RESTRICTION")) {
1004
1005                 /* FIXME: avoid to send multiple PAM messages after another */
1006                 switch (response.data.auth.reject_reason) {
1007                         case -1:
1008                                 break;
1009                         case REJECT_REASON_OTHER:
1010                                 if ((response.data.auth.policy.min_passwordage > 0) &&
1011                                     (pwd_last_set + response.data.auth.policy.min_passwordage > time(NULL))) {
1012                                         PAM_WB_REMARK_DIRECT(pamh, "NT_STATUS_PWD_TOO_RECENT");
1013                                 }
1014                                 break;
1015                         case REJECT_REASON_TOO_SHORT:
1016                                 PAM_WB_REMARK_DIRECT(pamh, "NT_STATUS_PWD_TOO_SHORT");
1017                                 break;
1018                         case REJECT_REASON_IN_HISTORY:
1019                                 PAM_WB_REMARK_DIRECT(pamh, "NT_STATUS_PWD_HISTORY_CONFLICT");
1020                                 break;
1021                         case REJECT_REASON_NOT_COMPLEX:
1022                                 _make_remark(pamh, PAM_ERROR_MSG, "Password does not meet complexity requirements");
1023                                 break;
1024                         default:
1025                                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1026                                                "unknown password change reject reason: %d",
1027                                                response.data.auth.reject_reason);
1028                                 break;
1029                 }
1030
1031                 _make_remark_format(pamh, PAM_ERROR_MSG,
1032                         "Your password must be at least %d characters; "
1033                         "cannot repeat any of the your previous %d passwords"
1034                         "%s. "
1035                         "Please type a different password. "
1036                         "Type a password which meets these requirements in both text boxes.",
1037                         response.data.auth.policy.min_length_password,
1038                         response.data.auth.policy.password_history,
1039                         (response.data.auth.policy.password_properties & DOMAIN_PASSWORD_COMPLEX) ?
1040                                 "; must contain capitals, numerals or punctuation; and cannot contain your account or full name" :
1041                                 "");
1042
1043         }
1044
1045         return ret;
1046 }
1047
1048 /*
1049  * Checks if a user has an account
1050  *
1051  * return values:
1052  *       1  = User not found
1053  *       0  = OK
1054  *      -1  = System error
1055  */
1056 static int valid_user(pam_handle_t *pamh, int ctrl, const char *user)
1057 {
1058         /* check not only if the user is available over NSS calls, also make
1059          * sure it's really a winbind user, this is important when stacking PAM
1060          * modules in the 'account' or 'password' facility. */
1061
1062         struct passwd *pwd = NULL;
1063         struct winbindd_request request;
1064         struct winbindd_response response;
1065         int ret;
1066
1067         ZERO_STRUCT(request);
1068         ZERO_STRUCT(response);
1069
1070         pwd = getpwnam(user);
1071         if (pwd == NULL) {
1072                 return 1;
1073         }
1074
1075         strncpy(request.data.username, user,
1076                 sizeof(request.data.username) - 1);
1077
1078         ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_GETPWNAM, &request, &response, user);
1079
1080         switch (ret) {
1081                 case PAM_USER_UNKNOWN:
1082                         return 1;
1083                 case PAM_SUCCESS:
1084                         return 0;
1085                 default:
1086                         break;
1087         }
1088         return -1;
1089 }
1090
1091 static char *_pam_delete(register char *xx)
1092 {
1093         _pam_overwrite(xx);
1094         _pam_drop(xx);
1095         return NULL;
1096 }
1097
1098 /*
1099  * obtain a password from the user
1100  */
1101
1102 static int _winbind_read_password(pam_handle_t * pamh,
1103                                   unsigned int ctrl,
1104                                   const char *comment,
1105                                   const char *prompt1,
1106                                   const char *prompt2,
1107                                   const char **pass)
1108 {
1109         int authtok_flag;
1110         int retval;
1111         const char *item;
1112         char *token;
1113
1114         _pam_log(pamh, ctrl, LOG_DEBUG, "getting password (0x%08x)", ctrl);
1115
1116         /*
1117          * make sure nothing inappropriate gets returned
1118          */
1119
1120         *pass = token = NULL;
1121
1122         /*
1123          * which authentication token are we getting?
1124          */
1125
1126         authtok_flag = on(WINBIND__OLD_PASSWORD, ctrl) ? PAM_OLDAUTHTOK : PAM_AUTHTOK;
1127
1128         /*
1129          * should we obtain the password from a PAM item ?
1130          */
1131
1132         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) || on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1133                 retval = _pam_get_item(pamh, authtok_flag, &item);
1134                 if (retval != PAM_SUCCESS) {
1135                         /* very strange. */
1136                         _pam_log(pamh, ctrl, LOG_ALERT,
1137                                  "pam_get_item returned error to unix-read-password"
1138                             );
1139                         return retval;
1140                 } else if (item != NULL) {      /* we have a password! */
1141                         *pass = item;
1142                         item = NULL;
1143                         _pam_log(pamh, ctrl, LOG_DEBUG,
1144                                  "pam_get_item returned a password");
1145                         return PAM_SUCCESS;
1146                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1147                         return PAM_AUTHTOK_RECOVER_ERR;         /* didn't work */
1148                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
1149                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
1150                         return PAM_AUTHTOK_RECOVER_ERR;
1151                 }
1152         }
1153         /*
1154          * getting here implies we will have to get the password from the
1155          * user directly.
1156          */
1157
1158         {
1159                 struct pam_message msg[3], *pmsg[3];
1160                 struct pam_response *resp;
1161                 int i, replies;
1162
1163                 /* prepare to converse */
1164
1165                 if (comment != NULL) {
1166                         pmsg[0] = &msg[0];
1167                         msg[0].msg_style = PAM_TEXT_INFO;
1168                         msg[0].msg = CONST_DISCARD(char *, comment);
1169                         i = 1;
1170                 } else {
1171                         i = 0;
1172                 }
1173
1174                 pmsg[i] = &msg[i];
1175                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
1176                 msg[i++].msg = CONST_DISCARD(char *, prompt1);
1177                 replies = 1;
1178
1179                 if (prompt2 != NULL) {
1180                         pmsg[i] = &msg[i];
1181                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
1182                         msg[i++].msg = CONST_DISCARD(char *, prompt2);
1183                         ++replies;
1184                 }
1185                 /* so call the conversation expecting i responses */
1186                 resp = NULL;
1187                 retval = converse(pamh, i, pmsg, &resp);
1188
1189                 if (resp != NULL) {
1190
1191                         /* interpret the response */
1192
1193                         if (retval == PAM_SUCCESS) {    /* a good conversation */
1194
1195                                 token = x_strdup(resp[i - replies].resp);
1196                                 if (token != NULL) {
1197                                         if (replies == 2) {
1198                                                 /* verify that password entered correctly */
1199                                                 if (!resp[i - 1].resp
1200                                                     || strcmp(token, resp[i - 1].resp)) {
1201                                                         _pam_delete(token);     /* mistyped */
1202                                                         retval = PAM_AUTHTOK_RECOVER_ERR;
1203                                                         _make_remark(pamh, PAM_ERROR_MSG, MISTYPED_PASS);
1204                                                 }
1205                                         }
1206                                 } else {
1207                                         _pam_log(pamh, ctrl, LOG_NOTICE, "could not recover authentication token");
1208                                         retval = PAM_AUTHTOK_RECOVER_ERR;
1209                                 }
1210
1211                         }
1212                         /*
1213                          * tidy up the conversation (resp_retcode) is ignored
1214                          * -- what is it for anyway? AGM
1215                          */
1216
1217                         _pam_drop_reply(resp, i);
1218
1219                 } else {
1220                         retval = (retval == PAM_SUCCESS)
1221                             ? PAM_AUTHTOK_RECOVER_ERR : retval;
1222                 }
1223         }
1224
1225         if (retval != PAM_SUCCESS) {
1226                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1227                                  "unable to obtain a password");
1228                 return retval;
1229         }
1230         /* 'token' is the entered password */
1231
1232         /* we store this password as an item */
1233
1234         retval = pam_set_item(pamh, authtok_flag, token);
1235         _pam_delete(token);     /* clean it up */
1236         if (retval != PAM_SUCCESS ||
1237             (retval = _pam_get_item(pamh, authtok_flag, &item)) != PAM_SUCCESS) {
1238
1239                 _pam_log(pamh, ctrl, LOG_CRIT, "error manipulating password");
1240                 return retval;
1241
1242         }
1243
1244         *pass = item;
1245         item = NULL;            /* break link to password */
1246
1247         return PAM_SUCCESS;
1248 }
1249
1250 const char *get_conf_item_string(const pam_handle_t *pamh,
1251                                  int argc,
1252                                  const char **argv,
1253                                  int ctrl,
1254                                  dictionary *d,
1255                                  const char *item,
1256                                  int config_flag)
1257 {
1258         int i = 0;
1259         const char *parm_opt = NULL;
1260         char *key = NULL;
1261
1262         if (!(ctrl & config_flag)) {
1263                 goto out;
1264         }
1265
1266         /* let the pam opt take precedence over the pam_winbind.conf option */
1267
1268         if (d != NULL) {
1269
1270                 if (!asprintf(&key, "global:%s", item)) {
1271                         goto out;
1272                 }
1273
1274                 parm_opt = iniparser_getstr(d, key);
1275                 SAFE_FREE(key);
1276         }
1277
1278         for ( i=0; i<argc; i++ ) {
1279
1280                 if ((strncmp(argv[i], item, strlen(item)) == 0)) {
1281                         char *p;
1282
1283                         if ( (p = strchr( argv[i], '=' )) == NULL) {
1284                                 _pam_log(pamh, ctrl, LOG_INFO, "no \"=\" delimiter for \"%s\" found\n", item);
1285                                 goto out;
1286                         }
1287                         _pam_log_debug(pamh, ctrl, LOG_INFO, "PAM config: %s '%s'\n", item, p+1);
1288                         return p + 1;
1289                 }
1290         }
1291
1292         if (d != NULL) {
1293                 _pam_log_debug(pamh, ctrl, LOG_INFO, "CONFIG file: %s '%s'\n", item, parm_opt);
1294         }
1295 out:
1296         return parm_opt;
1297 }
1298
1299 const char *get_krb5_cc_type_from_config(const pam_handle_t *pamh, int argc, const char **argv, int ctrl, dictionary *d)
1300 {
1301         return get_conf_item_string(pamh, argc, argv, ctrl, d, "krb5_ccache_type", WINBIND_KRB5_CCACHE_TYPE);
1302 }
1303
1304 const char *get_member_from_config(const pam_handle_t *pamh, int argc, const char **argv, int ctrl, dictionary *d)
1305 {
1306         const char *ret = NULL;
1307         ret = get_conf_item_string(pamh, argc, argv, ctrl, d, "require_membership_of", WINBIND_REQUIRED_MEMBERSHIP);
1308         if (ret) {
1309                 return ret;
1310         }
1311         return get_conf_item_string(pamh, argc, argv, ctrl, d, "require-membership-of", WINBIND_REQUIRED_MEMBERSHIP);
1312 }
1313
1314 PAM_EXTERN
1315 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
1316                         int argc, const char **argv)
1317 {
1318         const char *username;
1319         const char *password;
1320         const char *member = NULL;
1321         const char *cctype = NULL;
1322         int retval = PAM_AUTH_ERR;
1323         dictionary *d = NULL;
1324         char *username_ret = NULL;
1325         char *new_authtok_required = NULL;
1326
1327         /* parse arguments */
1328         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1329         if (ctrl == -1) {
1330                 retval = PAM_SYSTEM_ERR;
1331                 goto out;
1332         }
1333
1334         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", pamh, ctrl, flags);
1335
1336         /* Get the username */
1337         retval = pam_get_user(pamh, &username, NULL);
1338         if ((retval != PAM_SUCCESS) || (!username)) {
1339                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "can not get the username");
1340                 retval = PAM_SERVICE_ERR;
1341                 goto out;
1342         }
1343
1344         retval = _winbind_read_password(pamh, ctrl, NULL,
1345                                         "Password: ", NULL,
1346                                         &password);
1347
1348         if (retval != PAM_SUCCESS) {
1349                 _pam_log(pamh, ctrl, LOG_ERR, "Could not retrieve user's password");
1350                 retval = PAM_AUTHTOK_ERR;
1351                 goto out;
1352         }
1353
1354         /* Let's not give too much away in the log file */
1355
1356 #ifdef DEBUG_PASSWORD
1357         _pam_log_debug(pamh, ctrl, LOG_INFO, "Verify user '%s' with password '%s'",
1358                        username, password);
1359 #else
1360         _pam_log_debug(pamh, ctrl, LOG_INFO, "Verify user '%s'", username);
1361 #endif
1362
1363         member = get_member_from_config(pamh, argc, argv, ctrl, d);
1364
1365         cctype = get_krb5_cc_type_from_config(pamh, argc, argv, ctrl, d);
1366
1367         /* Now use the username to look up password */
1368         retval = winbind_auth_request(pamh, ctrl, username, password, member,
1369                                       cctype, NULL, NULL, &username_ret);
1370
1371         if (retval == PAM_NEW_AUTHTOK_REQD ||
1372             retval == PAM_AUTHTOK_EXPIRED) {
1373
1374                 if (!asprintf(&new_authtok_required, "%d", retval)) {
1375                         retval = PAM_BUF_ERR;
1376                         goto out;
1377                 }
1378
1379                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, new_authtok_required, _pam_winbind_cleanup_func);
1380
1381                 retval = PAM_SUCCESS;
1382                 goto out;
1383         }
1384
1385 out:
1386         if (username_ret) {
1387                 pam_set_item (pamh, PAM_USER, username_ret);
1388                 _pam_log_debug(pamh, ctrl, LOG_INFO, "Returned user was '%s'", username_ret);
1389                 free(username_ret);
1390         }
1391
1392         if (d) {
1393                 iniparser_freedict(d);
1394         }
1395
1396         if (!new_authtok_required) {
1397                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
1398         }
1399
1400         _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", pamh, ctrl, retval);
1401
1402         return retval;
1403 }
1404
1405 PAM_EXTERN
1406 int pam_sm_setcred(pam_handle_t *pamh, int flags,
1407                    int argc, const char **argv)
1408 {
1409         int ret = PAM_SYSTEM_ERR;
1410         dictionary *d = NULL;
1411
1412         /* parse arguments */
1413         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1414         if (ctrl == -1) {
1415                 ret = PAM_SYSTEM_ERR;
1416                 goto out;
1417         }
1418
1419         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", pamh, ctrl, flags);
1420
1421         switch (flags & ~PAM_SILENT) {
1422
1423                 case PAM_DELETE_CRED:
1424                         ret = pam_sm_close_session(pamh, flags, argc, argv);
1425                         break;
1426                 case PAM_REFRESH_CRED:
1427                         _pam_log_debug(pamh, ctrl, LOG_WARNING, "PAM_REFRESH_CRED not implemented");
1428                         ret = PAM_SUCCESS;
1429                         break;
1430                 case PAM_REINITIALIZE_CRED:
1431                         _pam_log_debug(pamh, ctrl, LOG_WARNING, "PAM_REINITIALIZE_CRED not implemented");
1432                         ret = PAM_SUCCESS;
1433                         break;
1434                 case PAM_ESTABLISH_CRED:
1435                         _pam_log_debug(pamh, ctrl, LOG_WARNING, "PAM_ESTABLISH_CRED not implemented");
1436                         ret = PAM_SUCCESS;
1437                         break;
1438                 default:
1439                         ret = PAM_SYSTEM_ERR;
1440                         break;
1441         }
1442
1443  out:
1444         if (d) {
1445                 iniparser_freedict(d);
1446         }
1447
1448         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", pamh, ctrl, ret);
1449
1450         return ret;
1451 }
1452
1453 /*
1454  * Account management. We want to verify that the account exists
1455  * before returning PAM_SUCCESS
1456  */
1457 PAM_EXTERN
1458 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
1459                    int argc, const char **argv)
1460 {
1461         const char *username;
1462         int ret = PAM_USER_UNKNOWN;
1463         void *tmp = NULL;
1464         dictionary *d = NULL;
1465
1466         /* parse arguments */
1467         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1468         if (ctrl == -1) {
1469                 return PAM_SYSTEM_ERR;
1470         }
1471
1472         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", pamh, ctrl, flags);
1473
1474
1475         /* Get the username */
1476         ret = pam_get_user(pamh, &username, NULL);
1477         if ((ret != PAM_SUCCESS) || (!username)) {
1478                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,"can not get the username");
1479                 ret = PAM_SERVICE_ERR;
1480                 goto out;
1481         }
1482
1483         /* Verify the username */
1484         ret = valid_user(pamh, ctrl, username);
1485         switch (ret) {
1486         case -1:
1487                 /* some sort of system error. The log was already printed */
1488                 ret = PAM_SERVICE_ERR;
1489                 goto out;
1490         case 1:
1491                 /* the user does not exist */
1492                 _pam_log_debug(pamh, ctrl, LOG_NOTICE, "user '%s' not found", username);
1493                 if (ctrl & WINBIND_UNKNOWN_OK_ARG) {
1494                         ret = PAM_IGNORE;
1495                         goto out;
1496                 }
1497                 ret = PAM_USER_UNKNOWN;
1498                 goto out;
1499         case 0:
1500                 pam_get_data( pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, (const void **)&tmp);
1501                 if (tmp != NULL) {
1502                         ret = atoi((const char *)tmp);
1503                         switch (ret) {
1504                         case PAM_AUTHTOK_EXPIRED:
1505                                 /* fall through, since new token is required in this case */
1506                         case PAM_NEW_AUTHTOK_REQD:
1507                                 _pam_log(pamh, ctrl, LOG_WARNING, "pam_sm_acct_mgmt success but %s is set",
1508                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
1509                                 _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' needs new password", username);
1510                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
1511                                 ret = PAM_NEW_AUTHTOK_REQD;
1512                                 goto out;
1513                         default:
1514                                 _pam_log(pamh, ctrl, LOG_WARNING, "pam_sm_acct_mgmt success");
1515                                 _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' granted access", username);
1516                                 ret = PAM_SUCCESS;
1517                                 goto out;
1518                         }
1519                 }
1520
1521                 /* Otherwise, the authentication looked good */
1522                 _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' granted access", username);
1523                 ret = PAM_SUCCESS;
1524                 goto out;
1525         default:
1526                 /* we don't know anything about this return value */
1527                 _pam_log(pamh, ctrl, LOG_ERR, "internal module error (ret = %d, user = '%s')",
1528                          ret, username);
1529                 ret = PAM_SERVICE_ERR;
1530                 goto out;
1531         }
1532
1533         /* should not be reached */
1534         ret = PAM_IGNORE;
1535
1536  out:
1537
1538         if (d) {
1539                 iniparser_freedict(d);
1540         }
1541
1542         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", pamh, ctrl, ret);
1543
1544         return ret;
1545 }
1546
1547 PAM_EXTERN
1548 int pam_sm_open_session(pam_handle_t *pamh, int flags,
1549                         int argc, const char **argv)
1550 {
1551         int ret = PAM_SYSTEM_ERR;
1552         dictionary *d = NULL;
1553
1554         /* parse arguments */
1555         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1556         if (ctrl == -1) {
1557                 ret = PAM_SYSTEM_ERR;
1558                 goto out;
1559         }
1560
1561         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", pamh, ctrl, flags);
1562
1563         ret = PAM_SUCCESS;
1564
1565  out:
1566         if (d) {
1567                 iniparser_freedict(d);
1568         }
1569
1570         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", pamh, ctrl, ret);
1571
1572         return ret;
1573 }
1574
1575 PAM_EXTERN
1576 int pam_sm_close_session(pam_handle_t *pamh, int flags,
1577                          int argc, const char **argv)
1578 {
1579         dictionary *d = NULL;
1580         int retval = PAM_SUCCESS;
1581
1582         /* parse arguments */
1583         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1584         if (ctrl == -1) {
1585                 retval = PAM_SYSTEM_ERR;
1586                 goto out;
1587         }
1588
1589         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", pamh, ctrl, flags);
1590
1591         if (!(flags & PAM_DELETE_CRED)) {
1592                 retval = PAM_SUCCESS;
1593                 goto out;
1594         }
1595
1596         if (ctrl & WINBIND_KRB5_AUTH) {
1597
1598                 /* destroy the ccache here */
1599                 struct winbindd_request request;
1600                 struct winbindd_response response;
1601                 const char *user;
1602                 const char *ccname = NULL;
1603                 struct passwd *pwd = NULL;
1604
1605                 ZERO_STRUCT(request);
1606                 ZERO_STRUCT(response);
1607
1608                 retval = pam_get_user(pamh, &user, "Username: ");
1609                 if (retval) {
1610                         _pam_log(pamh, ctrl, LOG_ERR, "could not identify user");
1611                         goto out;
1612                 }
1613
1614                 if (user == NULL) {
1615                         _pam_log(pamh, ctrl, LOG_ERR, "username was NULL!");
1616                         retval = PAM_USER_UNKNOWN;
1617                         goto out;
1618                 }
1619
1620                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "username [%s] obtained", user);
1621
1622                 ccname = pam_getenv(pamh, "KRB5CCNAME");
1623                 if (ccname == NULL) {
1624                         _pam_log_debug(pamh, ctrl, LOG_DEBUG, "user has no KRB5CCNAME environment");
1625                 }
1626
1627                 strncpy(request.data.logoff.user, user,
1628                         sizeof(request.data.logoff.user) - 1);
1629
1630                 if (ccname) {
1631                         strncpy(request.data.logoff.krb5ccname, ccname,
1632                                 sizeof(request.data.logoff.krb5ccname) - 1);
1633                 }
1634
1635                 pwd = getpwnam(user);
1636                 if (pwd == NULL) {
1637                         retval = PAM_USER_UNKNOWN;
1638                         goto out;
1639                 }
1640                 request.data.logoff.uid = pwd->pw_uid;
1641
1642                 request.flags = WBFLAG_PAM_KRB5 | WBFLAG_PAM_CONTACT_TRUSTDOM;
1643
1644                 retval = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_LOGOFF, &request, &response, user);
1645         }
1646
1647 out:
1648         if (d) {
1649                 iniparser_freedict(d);
1650         }
1651
1652         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", pamh, ctrl, retval);
1653
1654         return retval;
1655 }
1656
1657
1658
1659 PAM_EXTERN
1660 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
1661                      int argc, const char **argv)
1662 {
1663         unsigned int lctrl;
1664         int ret;
1665         unsigned int ctrl;
1666
1667         /* <DO NOT free() THESE> */
1668         const char *user;
1669         char *pass_old, *pass_new;
1670         /* </DO NOT free() THESE> */
1671
1672         char *Announce;
1673
1674         int retry = 0;
1675         dictionary *d = NULL;
1676
1677         ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1678         if (ctrl == -1) {
1679                 ret = PAM_SYSTEM_ERR;
1680                 goto out;
1681         }
1682
1683         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", pamh, ctrl, flags);
1684
1685         /* clearing offline bit for the auth in the password change */
1686         ctrl &= ~WINBIND_CACHED_LOGIN;
1687
1688         /*
1689          * First get the name of a user
1690          */
1691         ret = pam_get_user(pamh, &user, "Username: ");
1692         if (ret) {
1693                 _pam_log(pamh, ctrl, LOG_ERR,
1694                          "password - could not identify user");
1695                 goto out;
1696         }
1697
1698         if (user == NULL) {
1699                 _pam_log(pamh, ctrl, LOG_ERR, "username was NULL!");
1700                 ret = PAM_USER_UNKNOWN;
1701                 goto out;
1702         }
1703
1704         _pam_log_debug(pamh, ctrl, LOG_DEBUG, "username [%s] obtained", user);
1705
1706         /* check if this is really a user in winbindd, not only in NSS */
1707         ret = valid_user(pamh, ctrl, user);
1708         switch (ret) {
1709                 case 1:
1710                         ret = PAM_USER_UNKNOWN;
1711                         goto out;
1712                 case -1:
1713                         ret = PAM_SYSTEM_ERR;
1714                         goto out;
1715                 default:
1716                         break;
1717         }
1718
1719         /*
1720          * obtain and verify the current password (OLDAUTHTOK) for
1721          * the user.
1722          */
1723
1724         if (flags & PAM_PRELIM_CHECK) {
1725                 struct winbindd_response response;
1726                 time_t pwdlastset_prelim = 0;
1727
1728                 /* instruct user what is happening */
1729 #define greeting "Changing password for "
1730                 Announce = (char *) malloc(sizeof(greeting) + strlen(user));
1731                 if (Announce == NULL) {
1732                         _pam_log(pamh, ctrl, LOG_CRIT, "password - out of memory");
1733                         ret = PAM_BUF_ERR;
1734                         goto out;
1735                 }
1736                 (void) strcpy(Announce, greeting);
1737                 (void) strcpy(Announce + sizeof(greeting) - 1, user);
1738 #undef greeting
1739
1740                 lctrl = ctrl | WINBIND__OLD_PASSWORD;
1741                 ret = _winbind_read_password(pamh, lctrl,
1742                                                 Announce,
1743                                                 "(current) NT password: ",
1744                                                 NULL,
1745                                                 (const char **) &pass_old);
1746                 if (ret != PAM_SUCCESS) {
1747                         _pam_log(pamh, ctrl, LOG_NOTICE, "password - (old) token not obtained");
1748                         goto out;
1749                 }
1750
1751                 /* We don't need krb5 env set for password change test. */
1752                 ctrl &= ~WINBIND_KRB5_AUTH;
1753
1754                 /* verify that this is the password for this user */
1755
1756                 ret = winbind_auth_request(pamh, ctrl, user, pass_old,
1757                                         NULL, NULL, &response, &pwdlastset_prelim, NULL);
1758
1759                 if (ret != PAM_ACCT_EXPIRED &&
1760                     ret != PAM_AUTHTOK_EXPIRED &&
1761                     ret != PAM_NEW_AUTHTOK_REQD &&
1762                     ret != PAM_SUCCESS) {
1763                         pass_old = NULL;
1764                         if (d) {
1765                                 iniparser_freedict(d);
1766                         }
1767                         /* Deal with offline errors. */
1768                         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh,
1769                                                 response,
1770                                                 "NT_STATUS_NO_LOGON_SERVERS");
1771                         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh,
1772                                                 response,
1773                                                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
1774                         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh,
1775                                                 response,
1776                                                 "NT_STATUS_ACCESS_DENIED");
1777                         return ret;
1778                 }
1779
1780                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET, (void *)pwdlastset_prelim, NULL);
1781
1782                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK, (const void *) pass_old);
1783                 pass_old = NULL;
1784                 if (ret != PAM_SUCCESS) {
1785                         _pam_log(pamh, ctrl, LOG_CRIT, "failed to set PAM_OLDAUTHTOK");
1786                 }
1787         } else if (flags & PAM_UPDATE_AUTHTOK) {
1788
1789                 time_t pwdlastset_update = 0;
1790
1791                 /*
1792                  * obtain the proposed password
1793                  */
1794
1795                 /*
1796                  * get the old token back.
1797                  */
1798
1799                 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
1800
1801                 if (ret != PAM_SUCCESS) {
1802                         _pam_log(pamh, ctrl, LOG_NOTICE, "user not authenticated");
1803                         goto out;
1804                 }
1805
1806                 lctrl = ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
1807
1808                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
1809                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
1810                 }
1811                 retry = 0;
1812                 ret = PAM_AUTHTOK_ERR;
1813                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
1814                         /*
1815                          * use_authtok is to force the use of a previously entered
1816                          * password -- needed for pluggable password strength checking
1817                          */
1818
1819                         ret = _winbind_read_password(pamh, lctrl,
1820                                                         NULL,
1821                                                         "Enter new NT password: ",
1822                                                         "Retype new NT password: ",
1823                                                         (const char **) &pass_new);
1824
1825                         if (ret != PAM_SUCCESS) {
1826                                 _pam_log_debug(pamh, ctrl, LOG_ALERT
1827                                          ,"password - new password not obtained");
1828                                 pass_old = NULL;/* tidy up */
1829                                 goto out;
1830                         }
1831
1832                         /*
1833                          * At this point we know who the user is and what they
1834                          * propose as their new password. Verify that the new
1835                          * password is acceptable.
1836                          */
1837
1838                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
1839                                 pass_new = NULL;
1840                         }
1841                 }
1842
1843                 /*
1844                  * By reaching here we have approved the passwords and must now
1845                  * rebuild the password database file.
1846                  */
1847                 _pam_get_data( pamh, PAM_WINBIND_PWD_LAST_SET,
1848                                &pwdlastset_update);
1849
1850                 ret = winbind_chauthtok_request(pamh, ctrl, user, pass_old, pass_new, pwdlastset_update);
1851                 if (ret) {
1852                         _pam_overwrite(pass_new);
1853                         _pam_overwrite(pass_old);
1854                         pass_old = pass_new = NULL;
1855                         goto out;
1856                 }
1857
1858                 /* just in case we need krb5 creds after a password change over msrpc */
1859
1860                 if (ctrl & WINBIND_KRB5_AUTH) {
1861                         struct winbindd_response response;
1862
1863                         const char *member = get_member_from_config(pamh, argc, argv, ctrl, d);
1864                         const char *cctype = get_krb5_cc_type_from_config(pamh, argc, argv, ctrl, d);
1865
1866                         ret = winbind_auth_request(pamh, ctrl, user, pass_new,
1867                                                         member, cctype, &response, NULL, NULL);
1868                         _pam_overwrite(pass_new);
1869                         _pam_overwrite(pass_old);
1870                         pass_old = pass_new = NULL;
1871                         if (d) {
1872                                 iniparser_freedict(d);
1873                         }
1874                         /* Deal with offline errors. */
1875                         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh,
1876                                                 response,
1877                                                 "NT_STATUS_NO_LOGON_SERVERS");
1878                         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh,
1879                                                 response,
1880                                                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
1881                         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh,
1882                                                 response,
1883                                                 "NT_STATUS_ACCESS_DENIED");
1884                         return ret;
1885                 }
1886         } else {
1887                 ret = PAM_SERVICE_ERR;
1888         }
1889
1890 out:
1891         if (d) {
1892                 iniparser_freedict(d);
1893         }
1894
1895         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", pamh, ctrl, ret);
1896
1897         return ret;
1898 }
1899
1900 #ifdef PAM_STATIC
1901
1902 /* static module data */
1903
1904 struct pam_module _pam_winbind_modstruct = {
1905         MODULE_NAME,
1906         pam_sm_authenticate,
1907         pam_sm_setcred,
1908         pam_sm_acct_mgmt,
1909         pam_sm_open_session,
1910         pam_sm_close_session,
1911         pam_sm_chauthtok
1912 };
1913
1914 #endif
1915
1916 /*
1917  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
1918  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
1919  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
1920  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2007
1921  * Copyright (c) Jan Rêkorajski 1999.
1922  * Copyright (c) Andrew G. Morgan 1996-8.
1923  * Copyright (c) Alex O. Yuriev, 1996.
1924  * Copyright (c) Cristian Gafton 1996.
1925  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
1926  *
1927  * Redistribution and use in source and binary forms, with or without
1928  * modification, are permitted provided that the following conditions
1929  * are met:
1930  * 1. Redistributions of source code must retain the above copyright
1931  *    notice, and the entire permission notice in its entirety,
1932  *    including the disclaimer of warranties.
1933  * 2. Redistributions in binary form must reproduce the above copyright
1934  *    notice, this list of conditions and the following disclaimer in the
1935  *    documentation and/or other materials provided with the distribution.
1936  * 3. The name of the author may not be used to endorse or promote
1937  *    products derived from this software without specific prior
1938  *    written permission.
1939  *
1940  * ALTERNATIVELY, this product may be distributed under the terms of
1941  * the GNU Public License, in which case the provisions of the GPL are
1942  * required INSTEAD OF the above restrictions.  (This clause is
1943  * necessary due to a potential bad interaction between the GPL and
1944  * the restrictions contained in a BSD-style copyright.)
1945  *
1946  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
1947  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
1948  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
1949  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
1950  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
1951  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
1952  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1953  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
1954  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1955  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
1956  * OF THE POSSIBILITY OF SUCH DAMAGE.
1957  */