source/nsswitch/pam_winbind.c

   1 /* pam_winbind module
   2
   3    Copyright Andrew Tridgell <tridge@samba.org> 2000
   4    Copyright Tim Potter <tpot@samba.org> 2000
   5    Copyright Andrew Bartlett <abartlet@samba.org> 2002
   6    Copyright Guenther Deschner <gd@samba.org> 2005-2007
   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 /**
 741  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
 742  *
 743  * @param response The struct winbindd_response.
 744  *
 745  * @return string (caller needs to free).
 746  */
 747
 748 static char *_pam_compose_pwd_restriction_string(struct winbindd_response *response)
 749 {
 750         char *str = NULL;
 751         size_t offset = 0, ret = 0, str_size = 1024;
 752
 753         str = (char *)malloc(str_size);
 754         if (!str) {
 755                 return NULL;
 756         }
 757
 758         memset(str, '\0', str_size);
 759
 760         offset = snprintf(str, str_size, "Your password ");
 761         if (offset == -1) {
 762                 goto failed;
 763         }
 764
 765         if (response->data.auth.policy.min_length_password > 0) {
 766                 ret = snprintf(str+offset, str_size-offset,
 767                              "must be at least %d characters; ",
 768                              response->data.auth.policy.min_length_password);
 769                 if (ret == -1) {
 770                         goto failed;
 771                 }
 772                 offset += ret;
 773         }
 774
 775         if (response->data.auth.policy.password_history > 0) {
 776                 ret = snprintf(str+offset, str_size-offset,
 777                              "cannot repeat any of your previous %d passwords; ",
 778                              response->data.auth.policy.password_history);
 779                 if (ret == -1) {
 780                         goto failed;
 781                 }
 782                 offset += ret;
 783         }
 784
 785         if (response->data.auth.policy.password_properties & DOMAIN_PASSWORD_COMPLEX) {
 786                 ret = snprintf(str+offset, str_size-offset,
 787                              "must contain capitals, numerals or punctuation; "
 788                              "and cannot contain your account or full name; ");
 789                 if (ret == -1) {
 790                         goto failed;
 791                 }
 792                 offset += ret;
 793         }
 794
 795         ret = snprintf(str+offset, str_size-offset,
 796                      "Please type a different password. "
 797                      "Type a password which meets these requirements in both text boxes.");
 798         if (ret == -1) {
 799                 goto failed;
 800         }
 801
 802         return str;
 803
 804  failed:
 805         SAFE_FREE(str);
 806         return NULL;
 807 }
 808
 809 /* talk to winbindd */
 810 static int winbind_auth_request(pam_handle_t * pamh,
 811                                 int ctrl,
 812                                 const char *user,
 813                                 const char *pass,
 814                                 const char *member,
 815                                 const char *cctype,
 816                                 struct winbindd_response *p_response,
 817                                 time_t *pwd_last_set,
 818                                 char **user_ret)
 819 {
 820         struct winbindd_request request;
 821         struct winbindd_response response;
 822         int ret;
 823
 824         ZERO_STRUCT(request);
 825         ZERO_STRUCT(response);
 826
 827         if (pwd_last_set) {
 828                 *pwd_last_set = 0;
 829         }
 830
 831         strncpy(request.data.auth.user, user,
 832                 sizeof(request.data.auth.user)-1);
 833
 834         strncpy(request.data.auth.pass, pass,
 835                 sizeof(request.data.auth.pass)-1);
 836
 837         request.data.auth.krb5_cc_type[0] = '\0';
 838         request.data.auth.uid = -1;
 839
 840         request.flags = WBFLAG_PAM_INFO3_TEXT | WBFLAG_PAM_CONTACT_TRUSTDOM;
 841
 842         if (ctrl & WINBIND_KRB5_AUTH) {
 843
 844                 struct passwd *pwd = NULL;
 845
 846                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "enabling krb5 login flag\n");
 847
 848                 request.flags |= WBFLAG_PAM_KRB5 | WBFLAG_PAM_FALLBACK_AFTER_KRB5;
 849
 850                 pwd = getpwnam(user);
 851                 if (pwd == NULL) {
 852                         return PAM_USER_UNKNOWN;
 853                 }
 854                 request.data.auth.uid = pwd->pw_uid;
 855         }
 856
 857         if (ctrl & WINBIND_CACHED_LOGIN) {
 858                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "enabling cached login flag\n");
 859                 request.flags |= WBFLAG_PAM_CACHED_LOGIN;
 860         }
 861
 862         if (user_ret) {
 863                 *user_ret = NULL;
 864                 request.flags |= WBFLAG_PAM_UNIX_NAME;
 865         }
 866
 867         if (cctype != NULL) {
 868                 strncpy(request.data.auth.krb5_cc_type, cctype,
 869                         sizeof(request.data.auth.krb5_cc_type) - 1);
 870                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "enabling request for a %s krb5 ccache\n", cctype);
 871         }
 872
 873         request.data.auth.require_membership_of_sid[0] = '\0';
 874
 875         if (member != NULL) {
 876
 877                 if (!winbind_name_list_to_sid_string_list(pamh, ctrl, user, member,
 878                         request.data.auth.require_membership_of_sid,
 879                         sizeof(request.data.auth.require_membership_of_sid))) {
 880
 881                         _pam_log_debug(pamh, ctrl, LOG_ERR, "failed to serialize membership of sid \"%s\"\n", member);
 882                         return PAM_AUTH_ERR;
 883                 }
 884         }
 885
 886         ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_AUTH, &request, &response, user);
 887
 888         if (pwd_last_set) {
 889                 *pwd_last_set = response.data.auth.info3.pass_last_set_time;
 890         }
 891
 892         if ((ctrl & WINBIND_KRB5_AUTH) &&
 893             response.data.auth.krb5ccname[0] != '\0') {
 894
 895                 char var[PATH_MAX];
 896
 897                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "request returned KRB5CCNAME: %s",
 898                                response.data.auth.krb5ccname);
 899
 900                 snprintf(var, sizeof(var), "KRB5CCNAME=%s", response.data.auth.krb5ccname);
 901
 902                 ret = pam_putenv(pamh, var);
 903                 if (ret != PAM_SUCCESS) {
 904                         _pam_log(pamh, ctrl, LOG_ERR, "failed to set KRB5CCNAME to %s", var);
 905                         return ret;
 906                 }
 907         }
 908
 909         if (p_response) {
 910                 /* We want to process the response in the caller. */
 911                 *p_response = response;
 912                 return ret;
 913         }
 914
 915         if (ret) {
 916                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PASSWORD_EXPIRED");
 917                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PASSWORD_MUST_CHANGE");
 918                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_INVALID_WORKSTATION");
 919                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_INVALID_LOGON_HOURS");
 920                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_ACCOUNT_EXPIRED");
 921                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_ACCOUNT_DISABLED");
 922                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_ACCOUNT_LOCKED_OUT");
 923                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT");
 924                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT");
 925                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT");
 926                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
 927                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_NO_LOGON_SERVERS");
 928         }
 929
 930         /* handle the case where the auth was ok, but the password must expire right now */
 931         /* good catch from Ralf Haferkamp: an expiry of "never" is translated to -1 */
 932         if ( ! (response.data.auth.info3.acct_flags & ACB_PWNOEXP) &&
 933              ! (PAM_WB_GRACE_LOGON(response.data.auth.info3.user_flgs)) &&
 934             (response.data.auth.policy.expire > 0) &&
 935             (response.data.auth.info3.pass_last_set_time + response.data.auth.policy.expire < time(NULL))) {
 936
 937                 ret = PAM_AUTHTOK_EXPIRED;
 938
 939                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,"Password has expired (Password was last set: %d, "
 940                                "the policy says it should expire here %d (now it's: %d)\n",
 941                                response.data.auth.info3.pass_last_set_time,
 942                                response.data.auth.info3.pass_last_set_time + response.data.auth.policy.expire,
 943                                time(NULL));
 944
 945                 PAM_WB_REMARK_DIRECT_RET(pamh, "NT_STATUS_PASSWORD_EXPIRED");
 946
 947         }
 948
 949         /* warn a user if the password is about to expire soon */
 950         _pam_warn_password_expires_in_future(pamh, &response);
 951
 952         /* inform about logon type */
 953         if (PAM_WB_GRACE_LOGON(response.data.auth.info3.user_flgs)) {
 954
 955                 _make_remark(pamh, PAM_ERROR_MSG,
 956                         "Grace login. Please change your password as soon you're online again");
 957                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
 958                         "User %s logged on using grace logon\n", user);
 959
 960         } else if (PAM_WB_CACHED_LOGON(response.data.auth.info3.user_flgs)) {
 961
 962                 _make_remark(pamh, PAM_ERROR_MSG,
 963                         "Logging on using cached account. Network resources can be unavailable");
 964                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
 965                         "User %s logged on using cached account\n", user);
 966         }
 967
 968         /* save the CIFS homedir for pam_cifs / pam_mount */
 969         if (response.data.auth.info3.home_dir[0] != '\0') {
 970
 971                 int ret2 = pam_set_data(pamh, PAM_WINBIND_HOMEDIR,
 972                                         (void *) strdup(response.data.auth.info3.home_dir),
 973                                         _pam_winbind_cleanup_func);
 974                 if (ret2) {
 975                         _pam_log_debug(pamh, ctrl, LOG_DEBUG, "Could not set data: %s",
 976                                        pam_strerror(pamh, ret2));
 977                 }
 978
 979         }
 980
 981         /* save the logon script path for other PAM modules */
 982         if (response.data.auth.info3.logon_script[0] != '\0') {
 983
 984                 int ret2 = pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT,
 985                                         (void *) strdup(response.data.auth.info3.logon_script),
 986                                         _pam_winbind_cleanup_func);
 987                 if (ret2) {
 988                         _pam_log_debug(pamh, ctrl, LOG_DEBUG, "Could not set data: %s",
 989                                        pam_strerror(pamh, ret2));
 990                 }
 991         }
 992
 993         /* save the profile path for other PAM modules */
 994         if (response.data.auth.info3.profile_path[0] != '\0') {
 995
 996                 int ret2 = pam_set_data(pamh, PAM_WINBIND_PROFILEPATH,
 997                                         (void *) strdup(response.data.auth.info3.profile_path),
 998                                         _pam_winbind_cleanup_func);
 999                 if (ret2) {
1000                         _pam_log_debug(pamh, ctrl, LOG_DEBUG, "Could not set data: %s",
1001                                        pam_strerror(pamh, ret2));
1002                 }
1003         }
1004
1005         /* If winbindd returned a username, return the pointer to it here. */
1006         if (user_ret && response.extra_data.data) {
1007                 /* We have to trust it's a null terminated string. */
1008                 *user_ret = (char *)response.extra_data.data;
1009         }
1010
1011         return ret;
1012 }
1013
1014 /* talk to winbindd */
1015 static int winbind_chauthtok_request(pam_handle_t * pamh,
1016                                      int ctrl,
1017                                      const char *user,
1018                                      const char *oldpass,
1019                                      const char *newpass,
1020                                      time_t pwd_last_set)
1021 {
1022         struct winbindd_request request;
1023         struct winbindd_response response;
1024         int ret;
1025
1026         ZERO_STRUCT(request);
1027         ZERO_STRUCT(response);
1028
1029         if (request.data.chauthtok.user == NULL) return -2;
1030
1031         strncpy(request.data.chauthtok.user, user,
1032                 sizeof(request.data.chauthtok.user) - 1);
1033
1034         if (oldpass != NULL) {
1035                 strncpy(request.data.chauthtok.oldpass, oldpass,
1036                         sizeof(request.data.chauthtok.oldpass) - 1);
1037         } else {
1038                 request.data.chauthtok.oldpass[0] = '\0';
1039         }
1040
1041         if (newpass != NULL) {
1042                 strncpy(request.data.chauthtok.newpass, newpass,
1043                         sizeof(request.data.chauthtok.newpass) - 1);
1044         } else {
1045                 request.data.chauthtok.newpass[0] = '\0';
1046         }
1047
1048         if (ctrl & WINBIND_KRB5_AUTH) {
1049                 request.flags = WBFLAG_PAM_KRB5 | WBFLAG_PAM_CONTACT_TRUSTDOM;
1050         }
1051
1052         ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_CHAUTHTOK, &request, &response, user);
1053
1054         if (ret == PAM_SUCCESS) {
1055                 return ret;
1056         }
1057
1058         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_BACKUP_CONTROLLER");
1059         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
1060         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_NO_LOGON_SERVERS");
1061         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_ACCESS_DENIED");
1062
1063         /* TODO: tell the min pwd length ? */
1064         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PWD_TOO_SHORT");
1065
1066         /* TODO: tell the minage ? */
1067         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PWD_TOO_RECENT");
1068
1069         /* TODO: tell the history length ? */
1070         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PWD_HISTORY_CONFLICT");
1071
1072         if (!strcasecmp(response.data.auth.nt_status_string, "NT_STATUS_PASSWORD_RESTRICTION")) {
1073
1074                 char *pwd_restriction_string = NULL;
1075
1076                 /* FIXME: avoid to send multiple PAM messages after another */
1077                 switch (response.data.auth.reject_reason) {
1078                         case -1:
1079                                 break;
1080                         case REJECT_REASON_OTHER:
1081                                 if ((response.data.auth.policy.min_passwordage > 0) &&
1082                                     (pwd_last_set + response.data.auth.policy.min_passwordage > time(NULL))) {
1083                                         PAM_WB_REMARK_DIRECT(pamh, "NT_STATUS_PWD_TOO_RECENT");
1084                                 }
1085                                 break;
1086                         case REJECT_REASON_TOO_SHORT:
1087                                 PAM_WB_REMARK_DIRECT(pamh, "NT_STATUS_PWD_TOO_SHORT");
1088                                 break;
1089                         case REJECT_REASON_IN_HISTORY:
1090                                 PAM_WB_REMARK_DIRECT(pamh, "NT_STATUS_PWD_HISTORY_CONFLICT");
1091                                 break;
1092                         case REJECT_REASON_NOT_COMPLEX:
1093                                 _make_remark(pamh, PAM_ERROR_MSG, "Password does not meet complexity requirements");
1094                                 break;
1095                         default:
1096                                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1097                                                "unknown password change reject reason: %d",
1098                                                response.data.auth.reject_reason);
1099                                 break;
1100                 }
1101
1102                 pwd_restriction_string = _pam_compose_pwd_restriction_string(&response);
1103                 if (pwd_restriction_string) {
1104                         _make_remark(pamh, PAM_ERROR_MSG, pwd_restriction_string);
1105                         SAFE_FREE(pwd_restriction_string);
1106                 }
1107         }
1108
1109         return ret;
1110 }
1111
1112 /*
1113  * Checks if a user has an account
1114  *
1115  * return values:
1116  *       1  = User not found
1117  *       0  = OK
1118  *      -1  = System error
1119  */
1120 static int valid_user(pam_handle_t *pamh, int ctrl, const char *user)
1121 {
1122         /* check not only if the user is available over NSS calls, also make
1123          * sure it's really a winbind user, this is important when stacking PAM
1124          * modules in the 'account' or 'password' facility. */
1125
1126         struct passwd *pwd = NULL;
1127         struct winbindd_request request;
1128         struct winbindd_response response;
1129         int ret;
1130
1131         ZERO_STRUCT(request);
1132         ZERO_STRUCT(response);
1133
1134         pwd = getpwnam(user);
1135         if (pwd == NULL) {
1136                 return 1;
1137         }
1138
1139         strncpy(request.data.username, user,
1140                 sizeof(request.data.username) - 1);
1141
1142         ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_GETPWNAM, &request, &response, user);
1143
1144         switch (ret) {
1145                 case PAM_USER_UNKNOWN:
1146                         return 1;
1147                 case PAM_SUCCESS:
1148                         return 0;
1149                 default:
1150                         break;
1151         }
1152         return -1;
1153 }
1154
1155 static char *_pam_delete(register char *xx)
1156 {
1157         _pam_overwrite(xx);
1158         _pam_drop(xx);
1159         return NULL;
1160 }
1161
1162 /*
1163  * obtain a password from the user
1164  */
1165
1166 static int _winbind_read_password(pam_handle_t * pamh,
1167                                   unsigned int ctrl,
1168                                   const char *comment,
1169                                   const char *prompt1,
1170                                   const char *prompt2,
1171                                   const char **pass)
1172 {
1173         int authtok_flag;
1174         int retval;
1175         const char *item;
1176         char *token;
1177
1178         _pam_log(pamh, ctrl, LOG_DEBUG, "getting password (0x%08x)", ctrl);
1179
1180         /*
1181          * make sure nothing inappropriate gets returned
1182          */
1183
1184         *pass = token = NULL;
1185
1186         /*
1187          * which authentication token are we getting?
1188          */
1189
1190         authtok_flag = on(WINBIND__OLD_PASSWORD, ctrl) ? PAM_OLDAUTHTOK : PAM_AUTHTOK;
1191
1192         /*
1193          * should we obtain the password from a PAM item ?
1194          */
1195
1196         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) || on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1197                 retval = _pam_get_item(pamh, authtok_flag, &item);
1198                 if (retval != PAM_SUCCESS) {
1199                         /* very strange. */
1200                         _pam_log(pamh, ctrl, LOG_ALERT,
1201                                  "pam_get_item returned error to unix-read-password"
1202                             );
1203                         return retval;
1204                 } else if (item != NULL) {      /* we have a password! */
1205                         *pass = item;
1206                         item = NULL;
1207                         _pam_log(pamh, ctrl, LOG_DEBUG,
1208                                  "pam_get_item returned a password");
1209                         return PAM_SUCCESS;
1210                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1211                         return PAM_AUTHTOK_RECOVER_ERR;         /* didn't work */
1212                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
1213                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
1214                         return PAM_AUTHTOK_RECOVER_ERR;
1215                 }
1216         }
1217         /*
1218          * getting here implies we will have to get the password from the
1219          * user directly.
1220          */
1221
1222         {
1223                 struct pam_message msg[3], *pmsg[3];
1224                 struct pam_response *resp;
1225                 int i, replies;
1226
1227                 /* prepare to converse */
1228
1229                 if (comment != NULL) {
1230                         pmsg[0] = &msg[0];
1231                         msg[0].msg_style = PAM_TEXT_INFO;
1232                         msg[0].msg = CONST_DISCARD(char *, comment);
1233                         i = 1;
1234                 } else {
1235                         i = 0;
1236                 }
1237
1238                 pmsg[i] = &msg[i];
1239                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
1240                 msg[i++].msg = CONST_DISCARD(char *, prompt1);
1241                 replies = 1;
1242
1243                 if (prompt2 != NULL) {
1244                         pmsg[i] = &msg[i];
1245                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
1246                         msg[i++].msg = CONST_DISCARD(char *, prompt2);
1247                         ++replies;
1248                 }
1249                 /* so call the conversation expecting i responses */
1250                 resp = NULL;
1251                 retval = converse(pamh, i, pmsg, &resp);
1252
1253                 if (resp != NULL) {
1254
1255                         /* interpret the response */
1256
1257                         if (retval == PAM_SUCCESS) {    /* a good conversation */
1258
1259                                 token = x_strdup(resp[i - replies].resp);
1260                                 if (token != NULL) {
1261                                         if (replies == 2) {
1262                                                 /* verify that password entered correctly */
1263                                                 if (!resp[i - 1].resp
1264                                                     || strcmp(token, resp[i - 1].resp)) {
1265                                                         _pam_delete(token);     /* mistyped */
1266                                                         retval = PAM_AUTHTOK_RECOVER_ERR;
1267                                                         _make_remark(pamh, PAM_ERROR_MSG, MISTYPED_PASS);
1268                                                 }
1269                                         }
1270                                 } else {
1271                                         _pam_log(pamh, ctrl, LOG_NOTICE, "could not recover authentication token");
1272                                         retval = PAM_AUTHTOK_RECOVER_ERR;
1273                                 }
1274
1275                         }
1276                         /*
1277                          * tidy up the conversation (resp_retcode) is ignored
1278                          * -- what is it for anyway? AGM
1279                          */
1280
1281                         _pam_drop_reply(resp, i);
1282
1283                 } else {
1284                         retval = (retval == PAM_SUCCESS)
1285                             ? PAM_AUTHTOK_RECOVER_ERR : retval;
1286                 }
1287         }
1288
1289         if (retval != PAM_SUCCESS) {
1290                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1291                                  "unable to obtain a password");
1292                 return retval;
1293         }
1294         /* 'token' is the entered password */
1295
1296         /* we store this password as an item */
1297
1298         retval = pam_set_item(pamh, authtok_flag, token);
1299         _pam_delete(token);     /* clean it up */
1300         if (retval != PAM_SUCCESS ||
1301             (retval = _pam_get_item(pamh, authtok_flag, &item)) != PAM_SUCCESS) {
1302
1303                 _pam_log(pamh, ctrl, LOG_CRIT, "error manipulating password");
1304                 return retval;
1305
1306         }
1307
1308         *pass = item;
1309         item = NULL;            /* break link to password */
1310
1311         return PAM_SUCCESS;
1312 }
1313
1314 const char *get_conf_item_string(const pam_handle_t *pamh,
1315                                  int argc,
1316                                  const char **argv,
1317                                  int ctrl,
1318                                  dictionary *d,
1319                                  const char *item,
1320                                  int config_flag)
1321 {
1322         int i = 0;
1323         const char *parm_opt = NULL;
1324         char *key = NULL;
1325
1326         if (!(ctrl & config_flag)) {
1327                 goto out;
1328         }
1329
1330         /* let the pam opt take precedence over the pam_winbind.conf option */
1331
1332         if (d != NULL) {
1333
1334                 if (!asprintf(&key, "global:%s", item)) {
1335                         goto out;
1336                 }
1337
1338                 parm_opt = iniparser_getstr(d, key);
1339                 SAFE_FREE(key);
1340         }
1341
1342         for ( i=0; i<argc; i++ ) {
1343
1344                 if ((strncmp(argv[i], item, strlen(item)) == 0)) {
1345                         char *p;
1346
1347                         if ( (p = strchr( argv[i], '=' )) == NULL) {
1348                                 _pam_log(pamh, ctrl, LOG_INFO, "no \"=\" delimiter for \"%s\" found\n", item);
1349                                 goto out;
1350                         }
1351                         _pam_log_debug(pamh, ctrl, LOG_INFO, "PAM config: %s '%s'\n", item, p+1);
1352                         return p + 1;
1353                 }
1354         }
1355
1356         if (d != NULL) {
1357                 _pam_log_debug(pamh, ctrl, LOG_INFO, "CONFIG file: %s '%s'\n", item, parm_opt);
1358         }
1359 out:
1360         return parm_opt;
1361 }
1362
1363 const char *get_krb5_cc_type_from_config(const pam_handle_t *pamh, int argc, const char **argv, int ctrl, dictionary *d)
1364 {
1365         return get_conf_item_string(pamh, argc, argv, ctrl, d, "krb5_ccache_type", WINBIND_KRB5_CCACHE_TYPE);
1366 }
1367
1368 const char *get_member_from_config(const pam_handle_t *pamh, int argc, const char **argv, int ctrl, dictionary *d)
1369 {
1370         const char *ret = NULL;
1371         ret = get_conf_item_string(pamh, argc, argv, ctrl, d, "require_membership_of", WINBIND_REQUIRED_MEMBERSHIP);
1372         if (ret) {
1373                 return ret;
1374         }
1375         return get_conf_item_string(pamh, argc, argv, ctrl, d, "require-membership-of", WINBIND_REQUIRED_MEMBERSHIP);
1376 }
1377
1378 PAM_EXTERN
1379 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
1380                         int argc, const char **argv)
1381 {
1382         const char *username;
1383         const char *password;
1384         const char *member = NULL;
1385         const char *cctype = NULL;
1386         int retval = PAM_AUTH_ERR;
1387         dictionary *d = NULL;
1388         char *username_ret = NULL;
1389         char *new_authtok_required = NULL;
1390
1391         /* parse arguments */
1392         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1393         if (ctrl == -1) {
1394                 retval = PAM_SYSTEM_ERR;
1395                 goto out;
1396         }
1397
1398         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", pamh, ctrl, flags);
1399
1400         /* Get the username */
1401         retval = pam_get_user(pamh, &username, NULL);
1402         if ((retval != PAM_SUCCESS) || (!username)) {
1403                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "can not get the username");
1404                 retval = PAM_SERVICE_ERR;
1405                 goto out;
1406         }
1407
1408         retval = _winbind_read_password(pamh, ctrl, NULL,
1409                                         "Password: ", NULL,
1410                                         &password);
1411
1412         if (retval != PAM_SUCCESS) {
1413                 _pam_log(pamh, ctrl, LOG_ERR, "Could not retrieve user's password");
1414                 retval = PAM_AUTHTOK_ERR;
1415                 goto out;
1416         }
1417
1418         /* Let's not give too much away in the log file */
1419
1420 #ifdef DEBUG_PASSWORD
1421         _pam_log_debug(pamh, ctrl, LOG_INFO, "Verify user '%s' with password '%s'",
1422                        username, password);
1423 #else
1424         _pam_log_debug(pamh, ctrl, LOG_INFO, "Verify user '%s'", username);
1425 #endif
1426
1427         member = get_member_from_config(pamh, argc, argv, ctrl, d);
1428
1429         cctype = get_krb5_cc_type_from_config(pamh, argc, argv, ctrl, d);
1430
1431         /* Now use the username to look up password */
1432         retval = winbind_auth_request(pamh, ctrl, username, password, member,
1433                                       cctype, NULL, NULL, &username_ret);
1434
1435         if (retval == PAM_NEW_AUTHTOK_REQD ||
1436             retval == PAM_AUTHTOK_EXPIRED) {
1437
1438                 if (!asprintf(&new_authtok_required, "%d", retval)) {
1439                         retval = PAM_BUF_ERR;
1440                         goto out;
1441                 }
1442
1443                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, new_authtok_required, _pam_winbind_cleanup_func);
1444
1445                 retval = PAM_SUCCESS;
1446                 goto out;
1447         }
1448
1449 out:
1450         if (username_ret) {
1451                 pam_set_item (pamh, PAM_USER, username_ret);
1452                 _pam_log_debug(pamh, ctrl, LOG_INFO, "Returned user was '%s'", username_ret);
1453                 free(username_ret);
1454         }
1455
1456         if (d) {
1457                 iniparser_freedict(d);
1458         }
1459
1460         if (!new_authtok_required) {
1461                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
1462         }
1463
1464         _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", pamh, ctrl, retval);
1465
1466         return retval;
1467 }
1468
1469 PAM_EXTERN
1470 int pam_sm_setcred(pam_handle_t *pamh, int flags,
1471                    int argc, const char **argv)
1472 {
1473         int ret = PAM_SYSTEM_ERR;
1474         dictionary *d = NULL;
1475
1476         /* parse arguments */
1477         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1478         if (ctrl == -1) {
1479                 ret = PAM_SYSTEM_ERR;
1480                 goto out;
1481         }
1482
1483         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", pamh, ctrl, flags);
1484
1485         switch (flags & ~PAM_SILENT) {
1486
1487                 case PAM_DELETE_CRED:
1488                         ret = pam_sm_close_session(pamh, flags, argc, argv);
1489                         break;
1490                 case PAM_REFRESH_CRED:
1491                         _pam_log_debug(pamh, ctrl, LOG_WARNING, "PAM_REFRESH_CRED not implemented");
1492                         ret = PAM_SUCCESS;
1493                         break;
1494                 case PAM_REINITIALIZE_CRED:
1495                         _pam_log_debug(pamh, ctrl, LOG_WARNING, "PAM_REINITIALIZE_CRED not implemented");
1496                         ret = PAM_SUCCESS;
1497                         break;
1498                 case PAM_ESTABLISH_CRED:
1499                         _pam_log_debug(pamh, ctrl, LOG_WARNING, "PAM_ESTABLISH_CRED not implemented");
1500                         ret = PAM_SUCCESS;
1501                         break;
1502                 default:
1503                         ret = PAM_SYSTEM_ERR;
1504                         break;
1505         }
1506
1507  out:
1508         if (d) {
1509                 iniparser_freedict(d);
1510         }
1511
1512         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", pamh, ctrl, ret);
1513
1514         return ret;
1515 }
1516
1517 /*
1518  * Account management. We want to verify that the account exists
1519  * before returning PAM_SUCCESS
1520  */
1521 PAM_EXTERN
1522 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
1523                    int argc, const char **argv)
1524 {
1525         const char *username;
1526         int ret = PAM_USER_UNKNOWN;
1527         void *tmp = NULL;
1528         dictionary *d = NULL;
1529
1530         /* parse arguments */
1531         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1532         if (ctrl == -1) {
1533                 return PAM_SYSTEM_ERR;
1534         }
1535
1536         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", pamh, ctrl, flags);
1537
1538
1539         /* Get the username */
1540         ret = pam_get_user(pamh, &username, NULL);
1541         if ((ret != PAM_SUCCESS) || (!username)) {
1542                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,"can not get the username");
1543                 ret = PAM_SERVICE_ERR;
1544                 goto out;
1545         }
1546
1547         /* Verify the username */
1548         ret = valid_user(pamh, ctrl, username);
1549         switch (ret) {
1550         case -1:
1551                 /* some sort of system error. The log was already printed */
1552                 ret = PAM_SERVICE_ERR;
1553                 goto out;
1554         case 1:
1555                 /* the user does not exist */
1556                 _pam_log_debug(pamh, ctrl, LOG_NOTICE, "user '%s' not found", username);
1557                 if (ctrl & WINBIND_UNKNOWN_OK_ARG) {
1558                         ret = PAM_IGNORE;
1559                         goto out;
1560                 }
1561                 ret = PAM_USER_UNKNOWN;
1562                 goto out;
1563         case 0:
1564                 pam_get_data( pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, (const void **)&tmp);
1565                 if (tmp != NULL) {
1566                         ret = atoi((const char *)tmp);
1567                         switch (ret) {
1568                         case PAM_AUTHTOK_EXPIRED:
1569                                 /* fall through, since new token is required in this case */
1570                         case PAM_NEW_AUTHTOK_REQD:
1571                                 _pam_log(pamh, ctrl, LOG_WARNING, "pam_sm_acct_mgmt success but %s is set",
1572                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
1573                                 _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' needs new password", username);
1574                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
1575                                 ret = PAM_NEW_AUTHTOK_REQD;
1576                                 goto out;
1577                         default:
1578                                 _pam_log(pamh, ctrl, LOG_WARNING, "pam_sm_acct_mgmt success");
1579                                 _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' granted access", username);
1580                                 ret = PAM_SUCCESS;
1581                                 goto out;
1582                         }
1583                 }
1584
1585                 /* Otherwise, the authentication looked good */
1586                 _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' granted access", username);
1587                 ret = PAM_SUCCESS;
1588                 goto out;
1589         default:
1590                 /* we don't know anything about this return value */
1591                 _pam_log(pamh, ctrl, LOG_ERR, "internal module error (ret = %d, user = '%s')",
1592                          ret, username);
1593                 ret = PAM_SERVICE_ERR;
1594                 goto out;
1595         }
1596
1597         /* should not be reached */
1598         ret = PAM_IGNORE;
1599
1600  out:
1601
1602         if (d) {
1603                 iniparser_freedict(d);
1604         }
1605
1606         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", pamh, ctrl, ret);
1607
1608         return ret;
1609 }
1610
1611 PAM_EXTERN
1612 int pam_sm_open_session(pam_handle_t *pamh, int flags,
1613                         int argc, const char **argv)
1614 {
1615         int ret = PAM_SYSTEM_ERR;
1616         dictionary *d = NULL;
1617
1618         /* parse arguments */
1619         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1620         if (ctrl == -1) {
1621                 ret = PAM_SYSTEM_ERR;
1622                 goto out;
1623         }
1624
1625         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", pamh, ctrl, flags);
1626
1627         ret = PAM_SUCCESS;
1628
1629  out:
1630         if (d) {
1631                 iniparser_freedict(d);
1632         }
1633
1634         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", pamh, ctrl, ret);
1635
1636         return ret;
1637 }
1638
1639 PAM_EXTERN
1640 int pam_sm_close_session(pam_handle_t *pamh, int flags,
1641                          int argc, const char **argv)
1642 {
1643         dictionary *d = NULL;
1644         int retval = PAM_SUCCESS;
1645
1646         /* parse arguments */
1647         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1648         if (ctrl == -1) {
1649                 retval = PAM_SYSTEM_ERR;
1650                 goto out;
1651         }
1652
1653         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", pamh, ctrl, flags);
1654
1655         if (!(flags & PAM_DELETE_CRED)) {
1656                 retval = PAM_SUCCESS;
1657                 goto out;
1658         }
1659
1660         if (ctrl & WINBIND_KRB5_AUTH) {
1661
1662                 /* destroy the ccache here */
1663                 struct winbindd_request request;
1664                 struct winbindd_response response;
1665                 const char *user;
1666                 const char *ccname = NULL;
1667                 struct passwd *pwd = NULL;
1668
1669                 ZERO_STRUCT(request);
1670                 ZERO_STRUCT(response);
1671
1672                 retval = pam_get_user(pamh, &user, "Username: ");
1673                 if (retval) {
1674                         _pam_log(pamh, ctrl, LOG_ERR, "could not identify user");
1675                         goto out;
1676                 }
1677
1678                 if (user == NULL) {
1679                         _pam_log(pamh, ctrl, LOG_ERR, "username was NULL!");
1680                         retval = PAM_USER_UNKNOWN;
1681                         goto out;
1682                 }
1683
1684                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "username [%s] obtained", user);
1685
1686                 ccname = pam_getenv(pamh, "KRB5CCNAME");
1687                 if (ccname == NULL) {
1688                         _pam_log_debug(pamh, ctrl, LOG_DEBUG, "user has no KRB5CCNAME environment");
1689                 }
1690
1691                 strncpy(request.data.logoff.user, user,
1692                         sizeof(request.data.logoff.user) - 1);
1693
1694                 if (ccname) {
1695                         strncpy(request.data.logoff.krb5ccname, ccname,
1696                                 sizeof(request.data.logoff.krb5ccname) - 1);
1697                 }
1698
1699                 pwd = getpwnam(user);
1700                 if (pwd == NULL) {
1701                         retval = PAM_USER_UNKNOWN;
1702                         goto out;
1703                 }
1704                 request.data.logoff.uid = pwd->pw_uid;
1705
1706                 request.flags = WBFLAG_PAM_KRB5 | WBFLAG_PAM_CONTACT_TRUSTDOM;
1707
1708                 retval = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_LOGOFF, &request, &response, user);
1709         }
1710
1711 out:
1712         if (d) {
1713                 iniparser_freedict(d);
1714         }
1715
1716         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", pamh, ctrl, retval);
1717
1718         return retval;
1719 }
1720
1721
1722
1723 PAM_EXTERN
1724 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
1725                      int argc, const char **argv)
1726 {
1727         unsigned int lctrl;
1728         int ret;
1729         unsigned int ctrl;
1730
1731         /* <DO NOT free() THESE> */
1732         const char *user;
1733         char *pass_old, *pass_new;
1734         /* </DO NOT free() THESE> */
1735
1736         char *Announce;
1737
1738         int retry = 0;
1739         dictionary *d = NULL;
1740
1741         ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1742         if (ctrl == -1) {
1743                 ret = PAM_SYSTEM_ERR;
1744                 goto out;
1745         }
1746
1747         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", pamh, ctrl, flags);
1748
1749         /* clearing offline bit for the auth in the password change */
1750         ctrl &= ~WINBIND_CACHED_LOGIN;
1751
1752         /*
1753          * First get the name of a user
1754          */
1755         ret = pam_get_user(pamh, &user, "Username: ");
1756         if (ret) {
1757                 _pam_log(pamh, ctrl, LOG_ERR,
1758                          "password - could not identify user");
1759                 goto out;
1760         }
1761
1762         if (user == NULL) {
1763                 _pam_log(pamh, ctrl, LOG_ERR, "username was NULL!");
1764                 ret = PAM_USER_UNKNOWN;
1765                 goto out;
1766         }
1767
1768         _pam_log_debug(pamh, ctrl, LOG_DEBUG, "username [%s] obtained", user);
1769
1770         /* check if this is really a user in winbindd, not only in NSS */
1771         ret = valid_user(pamh, ctrl, user);
1772         switch (ret) {
1773                 case 1:
1774                         ret = PAM_USER_UNKNOWN;
1775                         goto out;
1776                 case -1:
1777                         ret = PAM_SYSTEM_ERR;
1778                         goto out;
1779                 default:
1780                         break;
1781         }
1782
1783         /*
1784          * obtain and verify the current password (OLDAUTHTOK) for
1785          * the user.
1786          */
1787
1788         if (flags & PAM_PRELIM_CHECK) {
1789                 struct winbindd_response response;
1790                 time_t pwdlastset_prelim = 0;
1791
1792                 /* instruct user what is happening */
1793 #define greeting "Changing password for "
1794                 Announce = (char *) malloc(sizeof(greeting) + strlen(user));
1795                 if (Announce == NULL) {
1796                         _pam_log(pamh, ctrl, LOG_CRIT, "password - out of memory");
1797                         ret = PAM_BUF_ERR;
1798                         goto out;
1799                 }
1800                 (void) strcpy(Announce, greeting);
1801                 (void) strcpy(Announce + sizeof(greeting) - 1, user);
1802 #undef greeting
1803
1804                 lctrl = ctrl | WINBIND__OLD_PASSWORD;
1805                 ret = _winbind_read_password(pamh, lctrl,
1806                                                 Announce,
1807                                                 "(current) NT password: ",
1808                                                 NULL,
1809                                                 (const char **) &pass_old);
1810                 if (ret != PAM_SUCCESS) {
1811                         _pam_log(pamh, ctrl, LOG_NOTICE, "password - (old) token not obtained");
1812                         goto out;
1813                 }
1814
1815                 /* We don't need krb5 env set for password change test. */
1816                 ctrl &= ~WINBIND_KRB5_AUTH;
1817
1818                 /* verify that this is the password for this user */
1819
1820                 ret = winbind_auth_request(pamh, ctrl, user, pass_old,
1821                                         NULL, NULL, &response, &pwdlastset_prelim, NULL);
1822
1823                 if (ret != PAM_ACCT_EXPIRED &&
1824                     ret != PAM_AUTHTOK_EXPIRED &&
1825                     ret != PAM_NEW_AUTHTOK_REQD &&
1826                     ret != PAM_SUCCESS) {
1827                         pass_old = NULL;
1828                         if (d) {
1829                                 iniparser_freedict(d);
1830                         }
1831                         /* Deal with offline errors. */
1832                         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh,
1833                                                 response,
1834                                                 "NT_STATUS_NO_LOGON_SERVERS");
1835                         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh,
1836                                                 response,
1837                                                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
1838                         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh,
1839                                                 response,
1840                                                 "NT_STATUS_ACCESS_DENIED");
1841                         return ret;
1842                 }
1843
1844                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET, (void *)pwdlastset_prelim, NULL);
1845
1846                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK, (const void *) pass_old);
1847                 pass_old = NULL;
1848                 if (ret != PAM_SUCCESS) {
1849                         _pam_log(pamh, ctrl, LOG_CRIT, "failed to set PAM_OLDAUTHTOK");
1850                 }
1851         } else if (flags & PAM_UPDATE_AUTHTOK) {
1852
1853                 time_t pwdlastset_update = 0;
1854
1855                 /*
1856                  * obtain the proposed password
1857                  */
1858
1859                 /*
1860                  * get the old token back.
1861                  */
1862
1863                 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
1864
1865                 if (ret != PAM_SUCCESS) {
1866                         _pam_log(pamh, ctrl, LOG_NOTICE, "user not authenticated");
1867                         goto out;
1868                 }
1869
1870                 lctrl = ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
1871
1872                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
1873                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
1874                 }
1875                 retry = 0;
1876                 ret = PAM_AUTHTOK_ERR;
1877                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
1878                         /*
1879                          * use_authtok is to force the use of a previously entered
1880                          * password -- needed for pluggable password strength checking
1881                          */
1882
1883                         ret = _winbind_read_password(pamh, lctrl,
1884                                                         NULL,
1885                                                         "Enter new NT password: ",
1886                                                         "Retype new NT password: ",
1887                                                         (const char **) &pass_new);
1888
1889                         if (ret != PAM_SUCCESS) {
1890                                 _pam_log_debug(pamh, ctrl, LOG_ALERT
1891                                          ,"password - new password not obtained");
1892                                 pass_old = NULL;/* tidy up */
1893                                 goto out;
1894                         }
1895
1896                         /*
1897                          * At this point we know who the user is and what they
1898                          * propose as their new password. Verify that the new
1899                          * password is acceptable.
1900                          */
1901
1902                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
1903                                 pass_new = NULL;
1904                         }
1905                 }
1906
1907                 /*
1908                  * By reaching here we have approved the passwords and must now
1909                  * rebuild the password database file.
1910                  */
1911                 _pam_get_data( pamh, PAM_WINBIND_PWD_LAST_SET,
1912                                &pwdlastset_update);
1913
1914                 ret = winbind_chauthtok_request(pamh, ctrl, user, pass_old, pass_new, pwdlastset_update);
1915                 if (ret) {
1916                         _pam_overwrite(pass_new);
1917                         _pam_overwrite(pass_old);
1918                         pass_old = pass_new = NULL;
1919                         goto out;
1920                 }
1921
1922                 /* just in case we need krb5 creds after a password change over msrpc */
1923
1924                 if (ctrl & WINBIND_KRB5_AUTH) {
1925                         struct winbindd_response response;
1926
1927                         const char *member = get_member_from_config(pamh, argc, argv, ctrl, d);
1928                         const char *cctype = get_krb5_cc_type_from_config(pamh, argc, argv, ctrl, d);
1929
1930                         ret = winbind_auth_request(pamh, ctrl, user, pass_new,
1931                                                         member, cctype, &response, NULL, NULL);
1932                         _pam_overwrite(pass_new);
1933                         _pam_overwrite(pass_old);
1934                         pass_old = pass_new = NULL;
1935                         if (d) {
1936                                 iniparser_freedict(d);
1937                         }
1938                         /* Deal with offline errors. */
1939                         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh,
1940                                                 response,
1941                                                 "NT_STATUS_NO_LOGON_SERVERS");
1942                         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh,
1943                                                 response,
1944                                                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
1945                         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh,
1946                                                 response,
1947                                                 "NT_STATUS_ACCESS_DENIED");
1948                         return ret;
1949                 }
1950         } else {
1951                 ret = PAM_SERVICE_ERR;
1952         }
1953
1954 out:
1955         if (d) {
1956                 iniparser_freedict(d);
1957         }
1958
1959         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", pamh, ctrl, ret);
1960
1961         return ret;
1962 }
1963
1964 #ifdef PAM_STATIC
1965
1966 /* static module data */
1967
1968 struct pam_module _pam_winbind_modstruct = {
1969         MODULE_NAME,
1970         pam_sm_authenticate,
1971         pam_sm_setcred,
1972         pam_sm_acct_mgmt,
1973         pam_sm_open_session,
1974         pam_sm_close_session,
1975         pam_sm_chauthtok
1976 };
1977
1978 #endif
1979
1980 /*
1981  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
1982  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
1983  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
1984  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2007
1985  * Copyright (c) Jan Rêkorajski 1999.
1986  * Copyright (c) Andrew G. Morgan 1996-8.
1987  * Copyright (c) Alex O. Yuriev, 1996.
1988  * Copyright (c) Cristian Gafton 1996.
1989  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
1990  *
1991  * Redistribution and use in source and binary forms, with or without
1992  * modification, are permitted provided that the following conditions
1993  * are met:
1994  * 1. Redistributions of source code must retain the above copyright
1995  *    notice, and the entire permission notice in its entirety,
1996  *    including the disclaimer of warranties.
1997  * 2. Redistributions in binary form must reproduce the above copyright
1998  *    notice, this list of conditions and the following disclaimer in the
1999  *    documentation and/or other materials provided with the distribution.
2000  * 3. The name of the author may not be used to endorse or promote
2001  *    products derived from this software without specific prior
2002  *    written permission.
2003  *
2004  * ALTERNATIVELY, this product may be distributed under the terms of
2005  * the GNU Public License, in which case the provisions of the GPL are
2006  * required INSTEAD OF the above restrictions.  (This clause is
2007  * necessary due to a potential bad interaction between the GPL and
2008  * the restrictions contained in a BSD-style copyright.)
2009  *
2010  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
2011  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
2012  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
2013  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
2014  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
2015  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
2016  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2017  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
2018  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
2019  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
2020  * OF THE POSSIBILITY OF SUCH DAMAGE.
2021  */