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, ...) PRINTF_ATTRIBUTE(4,5);
  82 static void _pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
  83 {
  84         va_list args;
  85
  86         if (_pam_log_is_silent(ctrl)) {
  87                 return;
  88         }
  89
  90         va_start(args, format);
  91         _pam_log_int(pamh, err, format, args);
  92         va_end(args);
  93 }
  94
  95 static BOOL _pam_log_is_debug_enabled(int ctrl)
  96 {
  97         if (ctrl == -1) {
  98                 return False;
  99         }
 100
 101         if (_pam_log_is_silent(ctrl)) {
 102                 return False;
 103         }
 104
 105         if (!(ctrl & WINBIND_DEBUG_ARG)) {
 106                 return False;
 107         }
 108
 109         return True;
 110 }
 111
 112 static BOOL _pam_log_is_debug_state_enabled(int ctrl)
 113 {
 114         if (!(ctrl & WINBIND_DEBUG_STATE)) {
 115                 return False;
 116         }
 117
 118         return _pam_log_is_debug_enabled(ctrl);
 119 }
 120
 121 static void _pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 122 static void _pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 123 {
 124         va_list args;
 125
 126         if (!_pam_log_is_debug_enabled(ctrl)) {
 127                 return;
 128         }
 129
 130         va_start(args, format);
 131         _pam_log_int(pamh, err, format, args);
 132         va_end(args);
 133 }
 134
 135 static void _pam_log_state_datum(const pam_handle_t *pamh, int ctrl, int item_type, const char *key, int is_string)
 136 {
 137         const void *data = NULL;
 138         if (item_type != 0) {
 139                 pam_get_item(pamh, item_type, &data);
 140         } else {
 141                 pam_get_data(pamh, key, &data);
 142         }
 143         if (data != NULL) {
 144                 const char *type = (item_type != 0) ? "ITEM" : "DATA";
 145                 if (is_string != 0) {
 146                         _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);
 147                 } else {
 148                         _pam_log_debug(pamh, ctrl, LOG_DEBUG, "[pamh: 0x%08x] STATE: %s(%s) = 0x%08x", (uint32) pamh, type, key, (uint32) data);
 149                 }
 150         }
 151 }
 152
 153 #define _PAM_LOG_STATE_DATA_POINTER(pamh, ctrl, module_data_name) \
 154         _pam_log_state_datum(pamh, ctrl, 0, module_data_name, 0)
 155
 156 #define _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, module_data_name) \
 157         _pam_log_state_datum(pamh, ctrl, 0, module_data_name, 1)
 158
 159 #define _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, item_type) \
 160         _pam_log_state_datum(pamh, ctrl, item_type, #item_type, 0)
 161
 162 #define _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, item_type) \
 163         _pam_log_state_datum(pamh, ctrl, item_type, #item_type, 1)
 164
 165 #ifdef DEBUG_PASSWORD
 166 #define _LOG_PASSWORD_AS_STRING 1
 167 #else
 168 #define _LOG_PASSWORD_AS_STRING 0
 169 #endif
 170
 171 #define _PAM_LOG_STATE_ITEM_PASSWORD(pamh, ctrl, item_type) \
 172         _pam_log_state_datum(pamh, ctrl, item_type, #item_type, _LOG_PASSWORD_AS_STRING)
 173
 174 static void _pam_log_state(const pam_handle_t *pamh, int ctrl)
 175 {
 176         if (!_pam_log_is_debug_state_enabled(ctrl)) {
 177                 return;
 178         }
 179
 180         _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_SERVICE);
 181         _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_USER);
 182         _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_TTY);
 183         _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_RHOST);
 184         _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_RUSER);
 185         _PAM_LOG_STATE_ITEM_PASSWORD(pamh, ctrl, PAM_OLDAUTHTOK);
 186         _PAM_LOG_STATE_ITEM_PASSWORD(pamh, ctrl, PAM_AUTHTOK);
 187         _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_USER_PROMPT);
 188         _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, PAM_CONV);
 189 #ifdef PAM_FAIL_DELAY
 190         _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, PAM_FAIL_DELAY);
 191 #endif
 192 #ifdef PAM_REPOSITORY
 193         _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, PAM_REPOSITORY);
 194 #endif
 195
 196         _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_HOMEDIR);
 197         _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_LOGONSCRIPT);
 198         _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_LOGONSERVER);
 199         _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_PROFILEPATH);
 200         _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_NEW_AUTHTOK_REQD); /* Use atoi to get PAM result code */
 201         _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
 202         _PAM_LOG_STATE_DATA_POINTER(pamh, ctrl, PAM_WINBIND_PWD_LAST_SET);
 203 }
 204
 205 static int _pam_parse(const pam_handle_t *pamh, int flags, int argc, const char **argv, dictionary **result_d)
 206 {
 207         int ctrl = 0;
 208         const char *config_file = NULL;
 209         int i;
 210         const char **v;
 211         dictionary *d = NULL;
 212
 213         if (flags & PAM_SILENT) {
 214                 ctrl |= WINBIND_SILENT;
 215         }
 216
 217         for (i=argc,v=argv; i-- > 0; ++v) {
 218                 if (!strncasecmp(*v, "config", strlen("config"))) {
 219                         ctrl |= WINBIND_CONFIG_FILE;
 220                         config_file = v[i];
 221                         break;
 222                 }
 223         }
 224
 225         if (config_file == NULL) {
 226                 config_file = PAM_WINBIND_CONFIG_FILE;
 227         }
 228
 229         d = iniparser_load(config_file);
 230         if (d == NULL) {
 231                 goto config_from_pam;
 232         }
 233
 234         if (iniparser_getboolean(d, "global:debug", False)) {
 235                 ctrl |= WINBIND_DEBUG_ARG;
 236         }
 237
 238         if (iniparser_getboolean(d, "global:debug_state", False)) {
 239                 ctrl |= WINBIND_DEBUG_STATE;
 240         }
 241
 242         if (iniparser_getboolean(d, "global:cached_login", False)) {
 243                 ctrl |= WINBIND_CACHED_LOGIN;
 244         }
 245
 246         if (iniparser_getboolean(d, "global:krb5_auth", False)) {
 247                 ctrl |= WINBIND_KRB5_AUTH;
 248         }
 249
 250         if (iniparser_getboolean(d, "global:silent", False)) {
 251                 ctrl |= WINBIND_SILENT;
 252         }
 253
 254         if (iniparser_getstr(d, "global:krb5_ccache_type") != NULL) {
 255                 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 256         }
 257
 258         if ((iniparser_getstr(d, "global:require-membership-of") != NULL) ||
 259             (iniparser_getstr(d, "global:require_membership_of") != NULL)) {
 260                 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 261         }
 262
 263         if (iniparser_getboolean(d, "global:try_first_pass", False)) {
 264                 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 265         }
 266
 267 config_from_pam:
 268         /* step through arguments */
 269         for (i=argc,v=argv; i-- > 0; ++v) {
 270
 271                 /* generic options */
 272                 if (!strcmp(*v,"debug"))
 273                         ctrl |= WINBIND_DEBUG_ARG;
 274                 else if (!strcasecmp(*v, "debug_state"))
 275                         ctrl |= WINBIND_DEBUG_STATE;
 276                 else if (!strcasecmp(*v, "silent"))
 277                         ctrl |= WINBIND_SILENT;
 278                 else if (!strcasecmp(*v, "use_authtok"))
 279                         ctrl |= WINBIND_USE_AUTHTOK_ARG;
 280                 else if (!strcasecmp(*v, "use_first_pass"))
 281                         ctrl |= WINBIND_USE_FIRST_PASS_ARG;
 282                 else if (!strcasecmp(*v, "try_first_pass"))
 283                         ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 284                 else if (!strcasecmp(*v, "unknown_ok"))
 285                         ctrl |= WINBIND_UNKNOWN_OK_ARG;
 286                 else if (!strncasecmp(*v, "require_membership_of", strlen("require_membership_of")))
 287                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 288                 else if (!strncasecmp(*v, "require-membership-of", strlen("require-membership-of")))
 289                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 290                 else if (!strcasecmp(*v, "krb5_auth"))
 291                         ctrl |= WINBIND_KRB5_AUTH;
 292                 else if (!strncasecmp(*v, "krb5_ccache_type", strlen("krb5_ccache_type")))
 293                         ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 294                 else if (!strcasecmp(*v, "cached_login"))
 295                         ctrl |= WINBIND_CACHED_LOGIN;
 296                 else {
 297                         _pam_log(pamh, ctrl, LOG_ERR, "pam_parse: unknown option: %s", *v);
 298                         return -1;
 299                 }
 300
 301         }
 302
 303         if (result_d) {
 304                 *result_d = d;
 305         } else {
 306                 if (d) {
 307                         iniparser_freedict(d);
 308                 }
 309         }
 310
 311         return ctrl;
 312 };
 313
 314 static void _pam_winbind_cleanup_func(pam_handle_t *pamh, void *data, int error_status)
 315 {
 316         int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
 317         if (_pam_log_is_debug_state_enabled(ctrl)) {
 318                 _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);
 319         }
 320         SAFE_FREE(data);
 321 }
 322
 323
 324 static const struct ntstatus_errors {
 325         const char *ntstatus_string;
 326         const char *error_string;
 327 } ntstatus_errors[] = {
 328         {"NT_STATUS_OK", "Success"},
 329         {"NT_STATUS_BACKUP_CONTROLLER", "No primary Domain Controler available"},
 330         {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND", "No domain controllers found"},
 331         {"NT_STATUS_NO_LOGON_SERVERS", "No logon servers"},
 332         {"NT_STATUS_PWD_TOO_SHORT", "Password too short"},
 333         {"NT_STATUS_PWD_TOO_RECENT", "The password of this user is too recent to change"},
 334         {"NT_STATUS_PWD_HISTORY_CONFLICT", "Password is already in password history"},
 335         {"NT_STATUS_PASSWORD_EXPIRED", "Your password has expired"},
 336         {"NT_STATUS_PASSWORD_MUST_CHANGE", "You need to change your password now"},
 337         {"NT_STATUS_INVALID_WORKSTATION", "You are not allowed to logon from this workstation"},
 338         {"NT_STATUS_INVALID_LOGON_HOURS", "You are not allowed to logon at this time"},
 339         {"NT_STATUS_ACCOUNT_EXPIRED", "Your account has expired. Please contact your System administrator"}, /* SCNR */
 340         {"NT_STATUS_ACCOUNT_DISABLED", "Your account is disabled. Please contact your System administrator"}, /* SCNR */
 341         {"NT_STATUS_ACCOUNT_LOCKED_OUT", "Your account has been locked. Please contact your System administrator"}, /* SCNR */
 342         {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT", "Invalid Trust Account"},
 343         {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT", "Invalid Trust Account"},
 344         {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT", "Invalid Trust Account"},
 345         {"NT_STATUS_ACCESS_DENIED", "Access is denied"},
 346         {NULL, NULL}
 347 };
 348
 349 const char *_get_ntstatus_error_string(const char *nt_status_string)
 350 {
 351         int i;
 352         for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
 353                 if (!strcasecmp(ntstatus_errors[i].ntstatus_string, nt_status_string)) {
 354                         return ntstatus_errors[i].error_string;
 355                 }
 356         }
 357         return NULL;
 358 }
 359
 360 /* --- authentication management functions --- */
 361
 362 /* Attempt a conversation */
 363
 364 static int converse(pam_handle_t *pamh, int nargs,
 365                     struct pam_message **message,
 366                     struct pam_response **response)
 367 {
 368         int retval;
 369         struct pam_conv *conv;
 370
 371         retval = _pam_get_item(pamh, PAM_CONV, &conv );
 372         if (retval == PAM_SUCCESS) {
 373                 retval = conv->conv(nargs, (const struct pam_message **)message,
 374                                     response, conv->appdata_ptr);
 375         }
 376
 377         return retval; /* propagate error status */
 378 }
 379
 380
 381 static int _make_remark(pam_handle_t * pamh, int flags, int type, const char *text)
 382 {
 383         int retval = PAM_SUCCESS;
 384
 385         struct pam_message *pmsg[1], msg[1];
 386         struct pam_response *resp;
 387
 388         if (flags & WINBIND_SILENT) {
 389                 return PAM_SUCCESS;
 390         }
 391
 392         pmsg[0] = &msg[0];
 393         msg[0].msg = CONST_DISCARD(char *, text);
 394         msg[0].msg_style = type;
 395
 396         resp = NULL;
 397         retval = converse(pamh, 1, pmsg, &resp);
 398
 399         if (resp) {
 400                 _pam_drop_reply(resp, 1);
 401         }
 402         return retval;
 403 }
 404
 405 static int _make_remark_v(pam_handle_t * pamh, int flags, int type, const char *format, va_list args)
 406 {
 407         char *var;
 408         int ret;
 409
 410         ret = vasprintf(&var, format, args);
 411         if (ret < 0) {
 412                 _pam_log(pamh, 0, LOG_ERR, "memory allocation failure");
 413                 return ret;
 414         }
 415
 416         ret = _make_remark(pamh, flags, type, var);
 417         SAFE_FREE(var);
 418         return ret;
 419 }
 420
 421 static int _make_remark_format(pam_handle_t * pamh, int flags, int type, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 422 static int _make_remark_format(pam_handle_t * pamh, int flags, int type, const char *format, ...)
 423 {
 424         int ret;
 425         va_list args;
 426
 427         va_start(args, format);
 428         ret = _make_remark_v(pamh, flags, type, format, args);
 429         va_end(args);
 430         return ret;
 431 }
 432
 433 static int pam_winbind_request(pam_handle_t * pamh, int ctrl,
 434                                enum winbindd_cmd req_type,
 435                                struct winbindd_request *request,
 436                                struct winbindd_response *response)
 437 {
 438         /* Fill in request and send down pipe */
 439         init_request(request, req_type);
 440
 441         if (write_sock(request, sizeof(*request), 0, 0) == -1) {
 442                 _pam_log(pamh, ctrl, LOG_ERR, "pam_winbind_request: write to socket failed!");
 443                 close_sock();
 444                 return PAM_SERVICE_ERR;
 445         }
 446
 447         /* Wait for reply */
 448         if (read_reply(response) == -1) {
 449                 _pam_log(pamh, ctrl, LOG_ERR, "pam_winbind_request: read from socket failed!");
 450                 close_sock();
 451                 return PAM_SERVICE_ERR;
 452         }
 453
 454         /* We are done with the socket - close it and avoid mischeif */
 455         close_sock();
 456
 457         /* Copy reply data from socket */
 458         if (response->result == WINBINDD_OK) {
 459                 return PAM_SUCCESS;
 460         }
 461
 462         /* no need to check for pam_error codes for getpwnam() */
 463         switch (req_type) {
 464
 465                 case WINBINDD_GETPWNAM:
 466                 case WINBINDD_LOOKUPNAME:
 467                         if (strlen(response->data.auth.nt_status_string) > 0) {
 468                                 _pam_log(pamh, ctrl, LOG_ERR, "request failed, NT error was %s",
 469                                 response->data.auth.nt_status_string);
 470                         } else {
 471                                 _pam_log(pamh, ctrl, LOG_ERR, "request failed");
 472                         }
 473                         return PAM_USER_UNKNOWN;
 474                 default:
 475                         break;
 476         }
 477
 478         if (response->data.auth.pam_error != PAM_SUCCESS) {
 479                 _pam_log(pamh, ctrl, LOG_ERR, "request failed: %s, PAM error was %s (%d), NT error was %s",
 480                          response->data.auth.error_string,
 481                          pam_strerror(pamh, response->data.auth.pam_error),
 482                          response->data.auth.pam_error,
 483                          response->data.auth.nt_status_string);
 484                 return response->data.auth.pam_error;
 485         }
 486
 487         _pam_log(pamh, ctrl, LOG_ERR, "request failed, but PAM error 0!");
 488
 489         return PAM_SERVICE_ERR;
 490 }
 491
 492 static int pam_winbind_request_log(pam_handle_t * pamh,
 493                                    int ctrl,
 494                                    enum winbindd_cmd req_type,
 495                                    struct winbindd_request *request,
 496                                    struct winbindd_response *response,
 497                                    const char *user)
 498 {
 499         int retval;
 500
 501         retval = pam_winbind_request(pamh, ctrl, req_type, request, response);
 502
 503         switch (retval) {
 504         case PAM_AUTH_ERR:
 505                 /* incorrect password */
 506                 _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' denied access (incorrect password or invalid membership)", user);
 507                 return retval;
 508         case PAM_ACCT_EXPIRED:
 509                 /* account expired */
 510                 _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' account expired", user);
 511                 return retval;
 512         case PAM_AUTHTOK_EXPIRED:
 513                 /* password expired */
 514                 _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' password expired", user);
 515                 return retval;
 516         case PAM_NEW_AUTHTOK_REQD:
 517                 /* new password required */
 518                 _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' new password required", user);
 519                 return retval;
 520         case PAM_USER_UNKNOWN:
 521                 /* the user does not exist */
 522                 _pam_log_debug(pamh, ctrl, LOG_NOTICE, "user '%s' not found", user);
 523                 if (ctrl & WINBIND_UNKNOWN_OK_ARG) {
 524                         return PAM_IGNORE;
 525                 }
 526                 return retval;
 527         case PAM_SUCCESS:
 528                 /* Otherwise, the authentication looked good */
 529                 switch (req_type) {
 530                         case WINBINDD_INFO:
 531                                 break;
 532                         case WINBINDD_PAM_AUTH:
 533                                 _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' granted access", user);
 534                                 break;
 535                         case WINBINDD_PAM_CHAUTHTOK:
 536                                 _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' password changed", user);
 537                                 break;
 538                         default:
 539                                 _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' OK", user);
 540                                 break;
 541                 }
 542
 543                 return retval;
 544         default:
 545                 /* we don't know anything about this return value */
 546                 _pam_log(pamh, ctrl, LOG_ERR, "internal module error (retval = %d, user = '%s')",
 547                          retval, user);
 548                 return retval;
 549         }
 550 }
 551
 552 /**
 553  * send a password expiry message if required
 554  *
 555  * @param pamh PAM handle
 556  * @param ctrl PAM winbind options.
 557  * @param next_change expected (calculated) next expiry date.
 558  * @param already_expired pointer to a boolean to indicate if the password is
 559  *        already expired.
 560  *
 561  * @return boolean Returns True if message has been sent, False if not.
 562  */
 563
 564 static BOOL _pam_send_password_expiry_message(pam_handle_t *pamh, int ctrl, time_t next_change, time_t now, BOOL *already_expired)
 565 {
 566         int days = 0;
 567         struct tm tm_now, tm_next_change;
 568
 569         if (already_expired) {
 570                 *already_expired = False;
 571         }
 572
 573         if (next_change <= now) {
 574                 PAM_WB_REMARK_DIRECT(pamh, ctrl, "NT_STATUS_PASSWORD_EXPIRED");
 575                 if (already_expired) {
 576                         *already_expired = True;
 577                 }
 578                 return True;
 579         }
 580
 581         if ((next_change < 0) ||
 582             (next_change > now + DAYS_TO_WARN_BEFORE_PWD_EXPIRES * SECONDS_PER_DAY)) {
 583                 return False;
 584         }
 585
 586         if ((localtime_r(&now, &tm_now) == NULL) ||
 587             (localtime_r(&next_change, &tm_next_change) == NULL)) {
 588                 return False;
 589         }
 590
 591         days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) - (tm_now.tm_yday+tm_now.tm_year*365);
 592
 593         if (days == 0) {
 594                 _make_remark(pamh, ctrl, PAM_TEXT_INFO, "Your password expires today");
 595                 return True;
 596         }
 597
 598         if (days > 0 && days < DAYS_TO_WARN_BEFORE_PWD_EXPIRES) {
 599                 _make_remark_format(pamh, ctrl, PAM_TEXT_INFO, "Your password will expire in %d %s",
 600                         days, (days > 1) ? "days":"day");
 601                 return True;
 602         }
 603
 604         return False;
 605 }
 606
 607 /**
 608  * Send a warning if the password expires in the near future
 609  *
 610  * @param pamh PAM handle
 611  * @param ctrl PAM winbind options.
 612  * @param response The full authentication response structure.
 613  * @param already_expired boolean, is the pwd already expired?
 614  *
 615  * @return void.
 616  */
 617
 618 static void _pam_warn_password_expiry(pam_handle_t *pamh,
 619                                       int flags,
 620                                       const struct winbindd_response *response,
 621                                       BOOL *already_expired)
 622 {
 623         time_t now = time(NULL);
 624         time_t next_change = 0;
 625
 626         if (already_expired) {
 627                 *already_expired = False;
 628         }
 629
 630         /* accounts with ACB_PWNOEXP set never receive a warning */
 631         if (response->data.auth.info3.acct_flags & ACB_PWNOEXP) {
 632                 return;
 633         }
 634
 635         /* no point in sending a warning if this is a grace logon */
 636         if (PAM_WB_GRACE_LOGON(response->data.auth.info3.user_flgs)) {
 637                 return;
 638         }
 639
 640         /* check if the info3 must change timestamp has been set */
 641         next_change = response->data.auth.info3.pass_must_change_time;
 642
 643         if (_pam_send_password_expiry_message(pamh, flags, next_change, now,
 644                                               already_expired)) {
 645                 return;
 646         }
 647
 648         /* now check for the global password policy */
 649         /* good catch from Ralf Haferkamp: an expiry of "never" is translated
 650          * to -1 */
 651         if (response->data.auth.policy.expire <= 0) {
 652                 return;
 653         }
 654
 655         next_change = response->data.auth.info3.pass_last_set_time +
 656                       response->data.auth.policy.expire;
 657
 658         if (_pam_send_password_expiry_message(pamh, flags, next_change, now,
 659                                               already_expired)) {
 660                 return;
 661         }
 662
 663         /* no warning sent */
 664 }
 665
 666 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
 667
 668 static BOOL safe_append_string(char *dest,
 669                         const char *src,
 670                         int dest_buffer_size)
 671 /**
 672  * Append a string, making sure not to overflow and to always return a NULL-terminated
 673  * string.
 674  *
 675  * @param dest Destination string buffer (must already be NULL-terminated).
 676  * @param src Source string buffer.
 677  * @param dest_buffer_size Size of dest buffer in bytes.
 678  *
 679  * @return False if dest buffer is not big enough (no bytes copied), True on success.
 680  */
 681 {
 682         int dest_length = strlen(dest);
 683         int src_length = strlen(src);
 684
 685         if ( dest_length + src_length + 1 > dest_buffer_size ) {
 686                 return False;
 687         }
 688
 689         memcpy(dest + dest_length, src, src_length + 1);
 690         return True;
 691 }
 692
 693 static BOOL winbind_name_to_sid_string(pam_handle_t *pamh,
 694                                 int ctrl,
 695                                 const char *user,
 696                                 const char *name,
 697                                 char *sid_list_buffer,
 698                                 int sid_list_buffer_size)
 699 /**
 700  * Convert a names into a SID string, appending it to a buffer.
 701  *
 702  * @param pamh PAM handle
 703  * @param ctrl PAM winbind options.
 704  * @param user User in PAM request.
 705  * @param name Name to convert.
 706  * @param sid_list_buffer Where to append the string sid.
 707  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
 708  *
 709  * @return False on failure, True on success.
 710  */
 711 {
 712         const char* sid_string;
 713         struct winbindd_response sid_response;
 714
 715         /* lookup name? */
 716         if (IS_SID_STRING(name)) {
 717                 sid_string = name;
 718         } else {
 719                 struct winbindd_request sid_request;
 720
 721                 ZERO_STRUCT(sid_request);
 722                 ZERO_STRUCT(sid_response);
 723
 724                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "no sid given, looking up: %s\n", name);
 725
 726                 /* fortunatly winbindd can handle non-separated names */
 727                 strncpy(sid_request.data.name.name, name,
 728                         sizeof(sid_request.data.name.name) - 1);
 729
 730                 if (pam_winbind_request_log(pamh, ctrl, WINBINDD_LOOKUPNAME, &sid_request, &sid_response, user)) {
 731                         _pam_log(pamh, ctrl, LOG_INFO, "could not lookup name: %s\n", name);
 732                         return False;
 733                 }
 734
 735                 sid_string = sid_response.data.sid.sid;
 736         }
 737
 738         if (!safe_append_string(sid_list_buffer, sid_string, sid_list_buffer_size)) {
 739                 return False;
 740         }
 741
 742         return True;
 743 }
 744
 745 static BOOL winbind_name_list_to_sid_string_list(pam_handle_t *pamh,
 746                                 int ctrl,
 747                                 const char *user,
 748                                 const char *name_list,
 749                                 char *sid_list_buffer,
 750                                 int sid_list_buffer_size)
 751 /**
 752  * Convert a list of names into a list of sids.
 753  *
 754  * @param pamh PAM handle
 755  * @param ctrl PAM winbind options.
 756  * @param user User in PAM request.
 757  * @param name_list List of names or string sids, separated by commas.
 758  * @param sid_list_buffer Where to put the list of string sids.
 759  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
 760  *
 761  * @return False on failure, True on success.
 762  */
 763 {
 764         BOOL result = False;
 765         char *current_name = NULL;
 766         const char *search_location;
 767         const char *comma;
 768
 769         if ( sid_list_buffer_size > 0 ) {
 770                 sid_list_buffer[0] = 0;
 771         }
 772
 773         search_location = name_list;
 774         while ( (comma = strstr(search_location, ",")) != NULL ) {
 775                 current_name = strndup(search_location, comma - search_location);
 776                 if (NULL == current_name) {
 777                         goto out;
 778                 }
 779
 780                 if (!winbind_name_to_sid_string(pamh, ctrl, user, current_name, sid_list_buffer, sid_list_buffer_size)) {
 781                         goto out;
 782                 }
 783
 784                 SAFE_FREE(current_name);
 785
 786                 if (!safe_append_string(sid_list_buffer, ",", sid_list_buffer_size)) {
 787                         goto out;
 788                 }
 789
 790                 search_location = comma + 1;
 791         }
 792
 793         if (!winbind_name_to_sid_string(pamh, ctrl, user, search_location, sid_list_buffer, sid_list_buffer_size)) {
 794                 goto out;
 795         }
 796
 797         result = True;
 798
 799 out:
 800         SAFE_FREE(current_name);
 801         return result;
 802 }
 803
 804 /**
 805  * put krb5ccname variable into environment
 806  *
 807  * @param pamh PAM handle
 808  * @param ctrl PAM winbind options.
 809  * @param krb5ccname env variable retrieved from winbindd.
 810  *
 811  * @return void.
 812  */
 813
 814 static void _pam_setup_krb5_env(pam_handle_t *pamh, int ctrl, const char *krb5ccname)
 815 {
 816         char var[PATH_MAX];
 817         int ret;
 818
 819         if (off(ctrl, WINBIND_KRB5_AUTH)) {
 820                 return;
 821         }
 822
 823         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
 824                 return;
 825         }
 826
 827         _pam_log_debug(pamh, ctrl, LOG_DEBUG, "request returned KRB5CCNAME: %s", krb5ccname);
 828
 829         if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
 830                 return;
 831         }
 832
 833         ret = pam_putenv(pamh, var);
 834         if (ret) {
 835                 _pam_log(pamh, ctrl, LOG_ERR, "failed to set KRB5CCNAME to %s: %s",
 836                         var, pam_strerror(pamh, ret));
 837         }
 838 }
 839
 840 /**
 841  * Set string into the PAM stack.
 842  *
 843  * @param pamh PAM handle
 844  * @param ctrl PAM winbind options.
 845  * @param data_name Key name for pam_set_data.
 846  * @param value String value.
 847  *
 848  * @return void.
 849  */
 850
 851 static void _pam_set_data_string(pam_handle_t *pamh, int ctrl, const char *data_name, const char *value)
 852 {
 853         int ret;
 854
 855         if ( !data_name || !value || (strlen(data_name) == 0) || (strlen(value) == 0) ) {
 856                 return;
 857         }
 858
 859         ret = pam_set_data(pamh, data_name, (void *)strdup(value), _pam_winbind_cleanup_func);
 860         if (ret) {
 861                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "Could not set data %s: %s\n",
 862                         data_name, pam_strerror(pamh, ret));
 863         }
 864
 865 }
 866
 867 /**
 868  * Set info3 strings into the PAM stack.
 869  *
 870  * @param pamh PAM handle
 871  * @param ctrl PAM winbind options.
 872  * @param data_name Key name for pam_set_data.
 873  * @param value String value.
 874  *
 875  * @return void.
 876  */
 877
 878 static void _pam_set_data_info3(pam_handle_t *pamh, int ctrl, struct winbindd_response *response)
 879 {
 880         _pam_set_data_string(pamh, ctrl, PAM_WINBIND_HOMEDIR, response->data.auth.info3.home_dir);
 881         _pam_set_data_string(pamh, ctrl, PAM_WINBIND_LOGONSCRIPT, response->data.auth.info3.logon_script);
 882         _pam_set_data_string(pamh, ctrl, PAM_WINBIND_LOGONSERVER, response->data.auth.info3.logon_srv);
 883         _pam_set_data_string(pamh, ctrl, PAM_WINBIND_PROFILEPATH, response->data.auth.info3.profile_path);
 884 }
 885
 886 /**
 887  * Free info3 strings in the PAM stack.
 888  *
 889  * @param pamh PAM handle
 890  *
 891  * @return void.
 892  */
 893
 894 static void _pam_free_data_info3(pam_handle_t *pamh)
 895 {
 896         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
 897         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
 898         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
 899         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
 900 }
 901
 902 /**
 903  * Send PAM_ERROR_MSG for cached or grace logons.
 904  *
 905  * @param pamh PAM handle
 906  * @param ctrl PAM winbind options.
 907  * @param username User in PAM request.
 908  * @param info3_user_flgs Info3 flags containing logon type bits.
 909  *
 910  * @return void.
 911  */
 912
 913 static void _pam_warn_logon_type(pam_handle_t *pamh, int ctrl, const char *username, uint32 info3_user_flgs)
 914 {
 915         /* inform about logon type */
 916         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
 917
 918                 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
 919                         "Grace login. Please change your password as soon you're online again");
 920                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
 921                         "User %s logged on using grace logon\n", username);
 922
 923         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
 924
 925                 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
 926                         "Domain Controller unreachable, using cached credentials instead. Network resources may be unavailable");
 927                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
 928                         "User %s logged on using cached credentials\n", username);
 929         }
 930 }
 931
 932 /**
 933  * Send PAM_ERROR_MSG for krb5 errors.
 934  *
 935  * @param pamh PAM handle
 936  * @param ctrl PAM winbind options.
 937  * @param username User in PAM request.
 938  * @param info3_user_flgs Info3 flags containing logon type bits.
 939  *
 940  * @return void.
 941  */
 942
 943 static void _pam_warn_krb5_failure(pam_handle_t *pamh, int ctrl, const char *username, uint32 info3_user_flgs)
 944 {
 945         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
 946                 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
 947                              "Failed to establish your Kerberos Ticket cache "
 948                              "due time differences\n"
 949                              "with the domain controller.  "
 950                              "Please verify the system time.\n");
 951                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
 952                         "User %s: Clock skew when getting Krb5 TGT\n", username);
 953         }
 954 }
 955
 956 /**
 957  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
 958  *
 959  * @param response The struct winbindd_response.
 960  *
 961  * @return string (caller needs to free).
 962  */
 963
 964 static char *_pam_compose_pwd_restriction_string(struct winbindd_response *response)
 965 {
 966         char *str = NULL;
 967         size_t offset = 0, ret = 0, str_size = 1024;
 968
 969         str = (char *)malloc(str_size);
 970         if (!str) {
 971                 return NULL;
 972         }
 973
 974         memset(str, '\0', str_size);
 975
 976         offset = snprintf(str, str_size, "Your password ");
 977         if (offset == -1) {
 978                 goto failed;
 979         }
 980
 981         if (response->data.auth.policy.min_length_password > 0) {
 982                 ret = snprintf(str+offset, str_size-offset,
 983                              "must be at least %d characters; ",
 984                              response->data.auth.policy.min_length_password);
 985                 if (ret == -1) {
 986                         goto failed;
 987                 }
 988                 offset += ret;
 989         }
 990
 991         if (response->data.auth.policy.password_history > 0) {
 992                 ret = snprintf(str+offset, str_size-offset,
 993                              "cannot repeat any of your previous %d passwords; ",
 994                              response->data.auth.policy.password_history);
 995                 if (ret == -1) {
 996                         goto failed;
 997                 }
 998                 offset += ret;
 999         }
1000
1001         if (response->data.auth.policy.password_properties & DOMAIN_PASSWORD_COMPLEX) {
1002                 ret = snprintf(str+offset, str_size-offset,
1003                              "must contain capitals, numerals or punctuation; "
1004                              "and cannot contain your account or full name; ");
1005                 if (ret == -1) {
1006                         goto failed;
1007                 }
1008                 offset += ret;
1009         }
1010
1011         ret = snprintf(str+offset, str_size-offset,
1012                      "Please type a different password. "
1013                      "Type a password which meets these requirements in both text boxes.");
1014         if (ret == -1) {
1015                 goto failed;
1016         }
1017
1018         return str;
1019
1020  failed:
1021         SAFE_FREE(str);
1022         return NULL;
1023 }
1024
1025 /* talk to winbindd */
1026 static int winbind_auth_request(pam_handle_t * pamh,
1027                                 int ctrl,
1028                                 const char *user,
1029                                 const char *pass,
1030                                 const char *member,
1031                                 const char *cctype,
1032                                 struct winbindd_response *p_response,
1033                                 time_t *pwd_last_set,
1034                                 char **user_ret)
1035 {
1036         struct winbindd_request request;
1037         struct winbindd_response response;
1038         int ret;
1039         BOOL already_expired = False;
1040
1041         ZERO_STRUCT(request);
1042         ZERO_STRUCT(response);
1043
1044         if (pwd_last_set) {
1045                 *pwd_last_set = 0;
1046         }
1047
1048         strncpy(request.data.auth.user, user,
1049                 sizeof(request.data.auth.user)-1);
1050
1051         strncpy(request.data.auth.pass, pass,
1052                 sizeof(request.data.auth.pass)-1);
1053
1054         request.data.auth.krb5_cc_type[0] = '\0';
1055         request.data.auth.uid = -1;
1056
1057         request.flags = WBFLAG_PAM_INFO3_TEXT | WBFLAG_PAM_CONTACT_TRUSTDOM;
1058
1059         if (ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1060                 struct passwd *pwd = NULL;
1061
1062                 pwd = getpwnam(user);
1063                 if (pwd == NULL) {
1064                         return PAM_USER_UNKNOWN;
1065                 }
1066                 request.data.auth.uid = pwd->pw_uid;
1067         }
1068
1069         if (ctrl & WINBIND_KRB5_AUTH) {
1070
1071                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "enabling krb5 login flag\n");
1072
1073                 request.flags |= WBFLAG_PAM_KRB5 | WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1074         }
1075
1076         if (ctrl & WINBIND_CACHED_LOGIN) {
1077                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "enabling cached login flag\n");
1078                 request.flags |= WBFLAG_PAM_CACHED_LOGIN;
1079         }
1080
1081         if (user_ret) {
1082                 *user_ret = NULL;
1083                 request.flags |= WBFLAG_PAM_UNIX_NAME;
1084         }
1085
1086         if (cctype != NULL) {
1087                 strncpy(request.data.auth.krb5_cc_type, cctype,
1088                         sizeof(request.data.auth.krb5_cc_type) - 1);
1089                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "enabling request for a %s krb5 ccache\n", cctype);
1090         }
1091
1092         request.data.auth.require_membership_of_sid[0] = '\0';
1093
1094         if (member != NULL) {
1095
1096                 if (!winbind_name_list_to_sid_string_list(pamh, ctrl, user, member,
1097                         request.data.auth.require_membership_of_sid,
1098                         sizeof(request.data.auth.require_membership_of_sid))) {
1099
1100                         _pam_log_debug(pamh, ctrl, LOG_ERR, "failed to serialize membership of sid \"%s\"\n", member);
1101                         return PAM_AUTH_ERR;
1102                 }
1103         }
1104
1105         ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_AUTH, &request, &response, user);
1106
1107         if (pwd_last_set) {
1108                 *pwd_last_set = response.data.auth.info3.pass_last_set_time;
1109         }
1110
1111         if (p_response) {
1112                 /* We want to process the response in the caller. */
1113                 *p_response = response;
1114                 return ret;
1115         }
1116
1117         if (ret) {
1118                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_PASSWORD_EXPIRED");
1119                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_PASSWORD_MUST_CHANGE");
1120                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_INVALID_WORKSTATION");
1121                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_INVALID_LOGON_HOURS");
1122                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_ACCOUNT_EXPIRED");
1123                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_ACCOUNT_DISABLED");
1124                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_ACCOUNT_LOCKED_OUT");
1125                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT");
1126                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT");
1127                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT");
1128                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
1129                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_NO_LOGON_SERVERS");
1130                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_WRONG_PASSWORD");
1131                 PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_ACCESS_DENIED");
1132         }
1133
1134         if (ret == PAM_SUCCESS) {
1135
1136                 /* warn a user if the password is about to expire soon */
1137                 _pam_warn_password_expiry(pamh, ctrl, &response, &already_expired);
1138
1139                 if (already_expired == True) {
1140                         _pam_log_debug(pamh, ctrl, LOG_DEBUG, "Password has expired "
1141                                        "(Password was last set: %lld, the policy says "
1142                                        "it should expire here %lld (now it's: %lu))\n",
1143                                        response.data.auth.info3.pass_last_set_time,
1144                                        response.data.auth.info3.pass_last_set_time +
1145                                        response.data.auth.policy.expire,
1146                                        time(NULL));
1147
1148                         return PAM_AUTHTOK_EXPIRED;
1149                 }
1150
1151                 /* inform about logon type */
1152                 _pam_warn_logon_type(pamh, ctrl, user, response.data.auth.info3.user_flgs);
1153
1154                 /* inform about krb5 failures */
1155                 _pam_warn_krb5_failure(pamh, ctrl, user, response.data.auth.info3.user_flgs);
1156
1157                 /* set some info3 info for other modules in the stack */
1158                 _pam_set_data_info3(pamh, ctrl, &response);
1159
1160                 /* put krb5ccname into env */
1161                 _pam_setup_krb5_env(pamh, ctrl, response.data.auth.krb5ccname);
1162
1163                 /* If winbindd returned a username, return the pointer to it here. */
1164                 if (user_ret && response.extra_data.data) {
1165                         /* We have to trust it's a null terminated string. */
1166                         *user_ret = (char *)response.extra_data.data;
1167                 }
1168         }
1169
1170         return ret;
1171 }
1172
1173 /* talk to winbindd */
1174 static int winbind_chauthtok_request(pam_handle_t * pamh,
1175                                      int ctrl,
1176                                      const char *user,
1177                                      const char *oldpass,
1178                                      const char *newpass,
1179                                      time_t pwd_last_set)
1180 {
1181         struct winbindd_request request;
1182         struct winbindd_response response;
1183         int ret;
1184
1185         ZERO_STRUCT(request);
1186         ZERO_STRUCT(response);
1187
1188         if (request.data.chauthtok.user == NULL) return -2;
1189
1190         strncpy(request.data.chauthtok.user, user,
1191                 sizeof(request.data.chauthtok.user) - 1);
1192
1193         if (oldpass != NULL) {
1194                 strncpy(request.data.chauthtok.oldpass, oldpass,
1195                         sizeof(request.data.chauthtok.oldpass) - 1);
1196         } else {
1197                 request.data.chauthtok.oldpass[0] = '\0';
1198         }
1199
1200         if (newpass != NULL) {
1201                 strncpy(request.data.chauthtok.newpass, newpass,
1202                         sizeof(request.data.chauthtok.newpass) - 1);
1203         } else {
1204                 request.data.chauthtok.newpass[0] = '\0';
1205         }
1206
1207         if (ctrl & WINBIND_KRB5_AUTH) {
1208                 request.flags = WBFLAG_PAM_KRB5 | WBFLAG_PAM_CONTACT_TRUSTDOM;
1209         }
1210
1211         ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_CHAUTHTOK, &request, &response, user);
1212
1213         if (ret == PAM_SUCCESS) {
1214                 return ret;
1215         }
1216
1217         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_BACKUP_CONTROLLER");
1218         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
1219         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_NO_LOGON_SERVERS");
1220         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_ACCESS_DENIED");
1221
1222         /* TODO: tell the min pwd length ? */
1223         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_PWD_TOO_SHORT");
1224
1225         /* TODO: tell the minage ? */
1226         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_PWD_TOO_RECENT");
1227
1228         /* TODO: tell the history length ? */
1229         PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_PWD_HISTORY_CONFLICT");
1230
1231         if (!strcasecmp(response.data.auth.nt_status_string, "NT_STATUS_PASSWORD_RESTRICTION")) {
1232
1233                 char *pwd_restriction_string = NULL;
1234
1235                 /* FIXME: avoid to send multiple PAM messages after another */
1236                 switch (response.data.auth.reject_reason) {
1237                         case -1:
1238                                 break;
1239                         case REJECT_REASON_OTHER:
1240                                 if ((response.data.auth.policy.min_passwordage > 0) &&
1241                                     (pwd_last_set + response.data.auth.policy.min_passwordage > time(NULL))) {
1242                                         PAM_WB_REMARK_DIRECT(pamh, ctrl, "NT_STATUS_PWD_TOO_RECENT");
1243                                 }
1244                                 break;
1245                         case REJECT_REASON_TOO_SHORT:
1246                                 PAM_WB_REMARK_DIRECT(pamh, ctrl, "NT_STATUS_PWD_TOO_SHORT");
1247                                 break;
1248                         case REJECT_REASON_IN_HISTORY:
1249                                 PAM_WB_REMARK_DIRECT(pamh, ctrl, "NT_STATUS_PWD_HISTORY_CONFLICT");
1250                                 break;
1251                         case REJECT_REASON_NOT_COMPLEX:
1252                                 _make_remark(pamh, ctrl, PAM_ERROR_MSG, "Password does not meet complexity requirements");
1253                                 break;
1254                         default:
1255                                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1256                                                "unknown password change reject reason: %d",
1257                                                response.data.auth.reject_reason);
1258                                 break;
1259                 }
1260
1261                 pwd_restriction_string = _pam_compose_pwd_restriction_string(&response);
1262                 if (pwd_restriction_string) {
1263                         _make_remark(pamh, ctrl, PAM_ERROR_MSG, pwd_restriction_string);
1264                         SAFE_FREE(pwd_restriction_string);
1265                 }
1266         }
1267
1268         return ret;
1269 }
1270
1271 /*
1272  * Checks if a user has an account
1273  *
1274  * return values:
1275  *       1  = User not found
1276  *       0  = OK
1277  *      -1  = System error
1278  */
1279 static int valid_user(pam_handle_t *pamh, int ctrl, const char *user)
1280 {
1281         /* check not only if the user is available over NSS calls, also make
1282          * sure it's really a winbind user, this is important when stacking PAM
1283          * modules in the 'account' or 'password' facility. */
1284
1285         struct passwd *pwd = NULL;
1286         struct winbindd_request request;
1287         struct winbindd_response response;
1288         int ret;
1289
1290         ZERO_STRUCT(request);
1291         ZERO_STRUCT(response);
1292
1293         pwd = getpwnam(user);
1294         if (pwd == NULL) {
1295                 return 1;
1296         }
1297
1298         strncpy(request.data.username, user,
1299                 sizeof(request.data.username) - 1);
1300
1301         ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_GETPWNAM, &request, &response, user);
1302
1303         switch (ret) {
1304                 case PAM_USER_UNKNOWN:
1305                         return 1;
1306                 case PAM_SUCCESS:
1307                         return 0;
1308                 default:
1309                         break;
1310         }
1311         return -1;
1312 }
1313
1314 static char *_pam_delete(register char *xx)
1315 {
1316         _pam_overwrite(xx);
1317         _pam_drop(xx);
1318         return NULL;
1319 }
1320
1321 /*
1322  * obtain a password from the user
1323  */
1324
1325 static int _winbind_read_password(pam_handle_t * pamh,
1326                                   unsigned int ctrl,
1327                                   const char *comment,
1328                                   const char *prompt1,
1329                                   const char *prompt2,
1330                                   const char **pass)
1331 {
1332         int authtok_flag;
1333         int retval;
1334         const char *item;
1335         char *token;
1336
1337         _pam_log(pamh, ctrl, LOG_DEBUG, "getting password (0x%08x)", ctrl);
1338
1339         /*
1340          * make sure nothing inappropriate gets returned
1341          */
1342
1343         *pass = token = NULL;
1344
1345         /*
1346          * which authentication token are we getting?
1347          */
1348
1349         authtok_flag = on(WINBIND__OLD_PASSWORD, ctrl) ? PAM_OLDAUTHTOK : PAM_AUTHTOK;
1350
1351         /*
1352          * should we obtain the password from a PAM item ?
1353          */
1354
1355         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) || on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1356                 retval = _pam_get_item(pamh, authtok_flag, &item);
1357                 if (retval != PAM_SUCCESS) {
1358                         /* very strange. */
1359                         _pam_log(pamh, ctrl, LOG_ALERT,
1360                                  "pam_get_item returned error to unix-read-password"
1361                             );
1362                         return retval;
1363                 } else if (item != NULL) {      /* we have a password! */
1364                         *pass = item;
1365                         item = NULL;
1366                         _pam_log(pamh, ctrl, LOG_DEBUG,
1367                                  "pam_get_item returned a password");
1368                         return PAM_SUCCESS;
1369                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1370                         return PAM_AUTHTOK_RECOVER_ERR;         /* didn't work */
1371                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
1372                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
1373                         return PAM_AUTHTOK_RECOVER_ERR;
1374                 }
1375         }
1376         /*
1377          * getting here implies we will have to get the password from the
1378          * user directly.
1379          */
1380
1381         {
1382                 struct pam_message msg[3], *pmsg[3];
1383                 struct pam_response *resp;
1384                 int i, replies;
1385
1386                 /* prepare to converse */
1387
1388                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
1389                         pmsg[0] = &msg[0];
1390                         msg[0].msg_style = PAM_TEXT_INFO;
1391                         msg[0].msg = CONST_DISCARD(char *, comment);
1392                         i = 1;
1393                 } else {
1394                         i = 0;
1395                 }
1396
1397                 pmsg[i] = &msg[i];
1398                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
1399                 msg[i++].msg = CONST_DISCARD(char *, prompt1);
1400                 replies = 1;
1401
1402                 if (prompt2 != NULL) {
1403                         pmsg[i] = &msg[i];
1404                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
1405                         msg[i++].msg = CONST_DISCARD(char *, prompt2);
1406                         ++replies;
1407                 }
1408                 /* so call the conversation expecting i responses */
1409                 resp = NULL;
1410                 retval = converse(pamh, i, pmsg, &resp);
1411
1412                 if (resp != NULL) {
1413
1414                         /* interpret the response */
1415
1416                         if (retval == PAM_SUCCESS) {    /* a good conversation */
1417
1418                                 token = x_strdup(resp[i - replies].resp);
1419                                 if (token != NULL) {
1420                                         if (replies == 2) {
1421                                                 /* verify that password entered correctly */
1422                                                 if (!resp[i - 1].resp
1423                                                     || strcmp(token, resp[i - 1].resp)) {
1424                                                         _pam_delete(token);     /* mistyped */
1425                                                         retval = PAM_AUTHTOK_RECOVER_ERR;
1426                                                         _make_remark(pamh, ctrl, PAM_ERROR_MSG, MISTYPED_PASS);
1427                                                 }
1428                                         }
1429                                 } else {
1430                                         _pam_log(pamh, ctrl, LOG_NOTICE, "could not recover authentication token");
1431                                         retval = PAM_AUTHTOK_RECOVER_ERR;
1432                                 }
1433
1434                         }
1435                         /*
1436                          * tidy up the conversation (resp_retcode) is ignored
1437                          * -- what is it for anyway? AGM
1438                          */
1439
1440                         _pam_drop_reply(resp, i);
1441
1442                 } else {
1443                         retval = (retval == PAM_SUCCESS)
1444                             ? PAM_AUTHTOK_RECOVER_ERR : retval;
1445                 }
1446         }
1447
1448         if (retval != PAM_SUCCESS) {
1449                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1450                                  "unable to obtain a password");
1451                 return retval;
1452         }
1453         /* 'token' is the entered password */
1454
1455         /* we store this password as an item */
1456
1457         retval = pam_set_item(pamh, authtok_flag, token);
1458         _pam_delete(token);     /* clean it up */
1459         if (retval != PAM_SUCCESS ||
1460             (retval = _pam_get_item(pamh, authtok_flag, &item)) != PAM_SUCCESS) {
1461
1462                 _pam_log(pamh, ctrl, LOG_CRIT, "error manipulating password");
1463                 return retval;
1464
1465         }
1466
1467         *pass = item;
1468         item = NULL;            /* break link to password */
1469
1470         return PAM_SUCCESS;
1471 }
1472
1473 const char *get_conf_item_string(const pam_handle_t *pamh,
1474                                  int argc,
1475                                  const char **argv,
1476                                  int ctrl,
1477                                  dictionary *d,
1478                                  const char *item,
1479                                  int config_flag)
1480 {
1481         int i = 0;
1482         const char *parm_opt = NULL;
1483         char *key = NULL;
1484
1485         if (!(ctrl & config_flag)) {
1486                 goto out;
1487         }
1488
1489         /* let the pam opt take precedence over the pam_winbind.conf option */
1490
1491         if (d != NULL) {
1492
1493                 if (!asprintf(&key, "global:%s", item)) {
1494                         goto out;
1495                 }
1496
1497                 parm_opt = iniparser_getstr(d, key);
1498                 SAFE_FREE(key);
1499         }
1500
1501         for ( i=0; i<argc; i++ ) {
1502
1503                 if ((strncmp(argv[i], item, strlen(item)) == 0)) {
1504                         char *p;
1505
1506                         if ( (p = strchr( argv[i], '=' )) == NULL) {
1507                                 _pam_log(pamh, ctrl, LOG_INFO, "no \"=\" delimiter for \"%s\" found\n", item);
1508                                 goto out;
1509                         }
1510                         _pam_log_debug(pamh, ctrl, LOG_INFO, "PAM config: %s '%s'\n", item, p+1);
1511                         return p + 1;
1512                 }
1513         }
1514
1515         if (d != NULL) {
1516                 _pam_log_debug(pamh, ctrl, LOG_INFO, "CONFIG file: %s '%s'\n", item, parm_opt);
1517         }
1518 out:
1519         return parm_opt;
1520 }
1521
1522 const char *get_krb5_cc_type_from_config(const pam_handle_t *pamh, int argc, const char **argv, int ctrl, dictionary *d)
1523 {
1524         return get_conf_item_string(pamh, argc, argv, ctrl, d, "krb5_ccache_type", WINBIND_KRB5_CCACHE_TYPE);
1525 }
1526
1527 const char *get_member_from_config(const pam_handle_t *pamh, int argc, const char **argv, int ctrl, dictionary *d)
1528 {
1529         const char *ret = NULL;
1530         ret = get_conf_item_string(pamh, argc, argv, ctrl, d, "require_membership_of", WINBIND_REQUIRED_MEMBERSHIP);
1531         if (ret) {
1532                 return ret;
1533         }
1534         return get_conf_item_string(pamh, argc, argv, ctrl, d, "require-membership-of", WINBIND_REQUIRED_MEMBERSHIP);
1535 }
1536
1537 PAM_EXTERN
1538 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
1539                         int argc, const char **argv)
1540 {
1541         const char *username;
1542         const char *password;
1543         const char *member = NULL;
1544         const char *cctype = NULL;
1545         int retval = PAM_AUTH_ERR;
1546         dictionary *d = NULL;
1547         char *username_ret = NULL;
1548         char *new_authtok_required = NULL;
1549         char *real_username = NULL;
1550
1551         /* parse arguments */
1552         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1553         if (ctrl == -1) {
1554                 retval = PAM_SYSTEM_ERR;
1555                 goto out;
1556         }
1557
1558         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", pamh, ctrl, flags);
1559
1560         /* Get the username */
1561         retval = pam_get_user(pamh, &username, NULL);
1562         if ((retval != PAM_SUCCESS) || (!username)) {
1563                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "can not get the username");
1564                 retval = PAM_SERVICE_ERR;
1565                 goto out;
1566         }
1567
1568 #if defined(AIX)
1569         /* Decode the user name since AIX does not support logn user
1570            names by default.  The name is encoded as _#uid.  */
1571
1572         if ( username[0] == '_' ) {
1573                 uid_t id = atoi( &username[1] );
1574                 struct passwd *pw = NULL;
1575
1576                 if ( (id!=0) && ((pw = getpwuid( id )) != NULL) ) {
1577                         real_username = strdup( pw->pw_name );
1578                 }
1579         }
1580 #endif
1581
1582         if ( !real_username ) {
1583                 /* Just making a copy of the username we got from PAM */
1584                 if ( (real_username = strdup( username )) == NULL ) {
1585                         _pam_log_debug(pamh, ctrl, LOG_DEBUG,
1586                                        "memory allocation failure when copying username");
1587                         retval = PAM_SERVICE_ERR;
1588                         goto out;
1589                 }
1590         }
1591
1592         retval = _winbind_read_password(pamh, ctrl, NULL,
1593                                         "Password: ", NULL,
1594                                         &password);
1595
1596         if (retval != PAM_SUCCESS) {
1597                 _pam_log(pamh, ctrl, LOG_ERR, "Could not retrieve user's password");
1598                 retval = PAM_AUTHTOK_ERR;
1599                 goto out;
1600         }
1601
1602         /* Let's not give too much away in the log file */
1603
1604 #ifdef DEBUG_PASSWORD
1605         _pam_log_debug(pamh, ctrl, LOG_INFO, "Verify user '%s' with password '%s'",
1606                        real_username, password);
1607 #else
1608         _pam_log_debug(pamh, ctrl, LOG_INFO, "Verify user '%s'", real_username);
1609 #endif
1610
1611         member = get_member_from_config(pamh, argc, argv, ctrl, d);
1612
1613         cctype = get_krb5_cc_type_from_config(pamh, argc, argv, ctrl, d);
1614
1615         /* Now use the username to look up password */
1616         retval = winbind_auth_request(pamh, ctrl, username, password, member,
1617                                       cctype, NULL, NULL, &username_ret);
1618
1619         if (retval == PAM_NEW_AUTHTOK_REQD ||
1620             retval == PAM_AUTHTOK_EXPIRED) {
1621
1622                 char *new_authtok_required_during_auth = NULL;
1623
1624                 if (!asprintf(&new_authtok_required, "%d", retval)) {
1625                         retval = PAM_BUF_ERR;
1626                         goto out;
1627                 }
1628
1629                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, new_authtok_required, _pam_winbind_cleanup_func);
1630
1631                 retval = PAM_SUCCESS;
1632
1633                 if (!asprintf(&new_authtok_required_during_auth, "%d", True)) {
1634                         retval = PAM_BUF_ERR;
1635                         goto out;
1636                 }
1637
1638                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
1639                              new_authtok_required_during_auth, _pam_winbind_cleanup_func);
1640
1641                 goto out;
1642         }
1643
1644 out:
1645         if (username_ret) {
1646                 pam_set_item (pamh, PAM_USER, username_ret);
1647                 _pam_log_debug(pamh, ctrl, LOG_INFO, "Returned user was '%s'", username_ret);
1648                 free(username_ret);
1649         }
1650
1651         if ( real_username ) {
1652                 free( real_username );
1653         }
1654
1655         if (d) {
1656                 iniparser_freedict(d);
1657         }
1658
1659         if (!new_authtok_required) {
1660                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
1661         }
1662
1663         if (retval != PAM_SUCCESS) {
1664                 _pam_free_data_info3(pamh);
1665         }
1666
1667         _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", pamh, ctrl, retval);
1668
1669         return retval;
1670 }
1671
1672 PAM_EXTERN
1673 int pam_sm_setcred(pam_handle_t *pamh, int flags,
1674                    int argc, const char **argv)
1675 {
1676         int ret = PAM_SYSTEM_ERR;
1677         dictionary *d = NULL;
1678
1679         /* parse arguments */
1680         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1681         if (ctrl == -1) {
1682                 ret = PAM_SYSTEM_ERR;
1683                 goto out;
1684         }
1685
1686         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", pamh, ctrl, flags);
1687
1688         switch (flags & ~PAM_SILENT) {
1689
1690                 case PAM_DELETE_CRED:
1691                         ret = pam_sm_close_session(pamh, flags, argc, argv);
1692                         break;
1693                 case PAM_REFRESH_CRED:
1694                         _pam_log_debug(pamh, ctrl, LOG_WARNING, "PAM_REFRESH_CRED not implemented");
1695                         ret = PAM_SUCCESS;
1696                         break;
1697                 case PAM_REINITIALIZE_CRED:
1698                         _pam_log_debug(pamh, ctrl, LOG_WARNING, "PAM_REINITIALIZE_CRED not implemented");
1699                         ret = PAM_SUCCESS;
1700                         break;
1701                 case PAM_ESTABLISH_CRED:
1702                         _pam_log_debug(pamh, ctrl, LOG_WARNING, "PAM_ESTABLISH_CRED not implemented");
1703                         ret = PAM_SUCCESS;
1704                         break;
1705                 default:
1706                         ret = PAM_SYSTEM_ERR;
1707                         break;
1708         }
1709
1710  out:
1711         if (d) {
1712                 iniparser_freedict(d);
1713         }
1714
1715         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", pamh, ctrl, ret);
1716
1717         return ret;
1718 }
1719
1720 /*
1721  * Account management. We want to verify that the account exists
1722  * before returning PAM_SUCCESS
1723  */
1724 PAM_EXTERN
1725 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
1726                    int argc, const char **argv)
1727 {
1728         const char *username;
1729         int ret = PAM_USER_UNKNOWN;
1730         void *tmp = NULL;
1731         dictionary *d = NULL;
1732
1733         /* parse arguments */
1734         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1735         if (ctrl == -1) {
1736                 return PAM_SYSTEM_ERR;
1737         }
1738
1739         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", pamh, ctrl, flags);
1740
1741
1742         /* Get the username */
1743         ret = pam_get_user(pamh, &username, NULL);
1744         if ((ret != PAM_SUCCESS) || (!username)) {
1745                 _pam_log_debug(pamh, ctrl, LOG_DEBUG,"can not get the username");
1746                 ret = PAM_SERVICE_ERR;
1747                 goto out;
1748         }
1749
1750         /* Verify the username */
1751         ret = valid_user(pamh, ctrl, username);
1752         switch (ret) {
1753         case -1:
1754                 /* some sort of system error. The log was already printed */
1755                 ret = PAM_SERVICE_ERR;
1756                 goto out;
1757         case 1:
1758                 /* the user does not exist */
1759                 _pam_log_debug(pamh, ctrl, LOG_NOTICE, "user '%s' not found", username);
1760                 if (ctrl & WINBIND_UNKNOWN_OK_ARG) {
1761                         ret = PAM_IGNORE;
1762                         goto out;
1763                 }
1764                 ret = PAM_USER_UNKNOWN;
1765                 goto out;
1766         case 0:
1767                 pam_get_data( pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, (const void **)&tmp);
1768                 if (tmp != NULL) {
1769                         ret = atoi((const char *)tmp);
1770                         switch (ret) {
1771                         case PAM_AUTHTOK_EXPIRED:
1772                                 /* fall through, since new token is required in this case */
1773                         case PAM_NEW_AUTHTOK_REQD:
1774                                 _pam_log(pamh, ctrl, LOG_WARNING, "pam_sm_acct_mgmt success but %s is set",
1775                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
1776                                 _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' needs new password", username);
1777                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
1778                                 ret = PAM_NEW_AUTHTOK_REQD;
1779                                 goto out;
1780                         default:
1781                                 _pam_log(pamh, ctrl, LOG_WARNING, "pam_sm_acct_mgmt success");
1782                                 _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' granted access", username);
1783                                 ret = PAM_SUCCESS;
1784                                 goto out;
1785                         }
1786                 }
1787
1788                 /* Otherwise, the authentication looked good */
1789                 _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' granted access", username);
1790                 ret = PAM_SUCCESS;
1791                 goto out;
1792         default:
1793                 /* we don't know anything about this return value */
1794                 _pam_log(pamh, ctrl, LOG_ERR, "internal module error (ret = %d, user = '%s')",
1795                          ret, username);
1796                 ret = PAM_SERVICE_ERR;
1797                 goto out;
1798         }
1799
1800         /* should not be reached */
1801         ret = PAM_IGNORE;
1802
1803  out:
1804
1805         if (d) {
1806                 iniparser_freedict(d);
1807         }
1808
1809         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", pamh, ctrl, ret);
1810
1811         return ret;
1812 }
1813
1814 PAM_EXTERN
1815 int pam_sm_open_session(pam_handle_t *pamh, int flags,
1816                         int argc, const char **argv)
1817 {
1818         int ret = PAM_SYSTEM_ERR;
1819         dictionary *d = NULL;
1820
1821         /* parse arguments */
1822         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1823         if (ctrl == -1) {
1824                 ret = PAM_SYSTEM_ERR;
1825                 goto out;
1826         }
1827
1828         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", pamh, ctrl, flags);
1829
1830         ret = PAM_SUCCESS;
1831
1832  out:
1833         if (d) {
1834                 iniparser_freedict(d);
1835         }
1836
1837         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", pamh, ctrl, ret);
1838
1839         return ret;
1840 }
1841
1842 PAM_EXTERN
1843 int pam_sm_close_session(pam_handle_t *pamh, int flags,
1844                          int argc, const char **argv)
1845 {
1846         dictionary *d = NULL;
1847         int retval = PAM_SUCCESS;
1848
1849         /* parse arguments */
1850         int ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1851         if (ctrl == -1) {
1852                 retval = PAM_SYSTEM_ERR;
1853                 goto out;
1854         }
1855
1856         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", pamh, ctrl, flags);
1857
1858         if (!(flags & PAM_DELETE_CRED)) {
1859                 retval = PAM_SUCCESS;
1860                 goto out;
1861         }
1862
1863         if (ctrl & WINBIND_KRB5_AUTH) {
1864
1865                 /* destroy the ccache here */
1866                 struct winbindd_request request;
1867                 struct winbindd_response response;
1868                 const char *user;
1869                 const char *ccname = NULL;
1870                 struct passwd *pwd = NULL;
1871
1872                 ZERO_STRUCT(request);
1873                 ZERO_STRUCT(response);
1874
1875                 retval = pam_get_user(pamh, &user, "Username: ");
1876                 if (retval) {
1877                         _pam_log(pamh, ctrl, LOG_ERR, "could not identify user");
1878                         goto out;
1879                 }
1880
1881                 if (user == NULL) {
1882                         _pam_log(pamh, ctrl, LOG_ERR, "username was NULL!");
1883                         retval = PAM_USER_UNKNOWN;
1884                         goto out;
1885                 }
1886
1887                 _pam_log_debug(pamh, ctrl, LOG_DEBUG, "username [%s] obtained", user);
1888
1889                 ccname = pam_getenv(pamh, "KRB5CCNAME");
1890                 if (ccname == NULL) {
1891                         _pam_log_debug(pamh, ctrl, LOG_DEBUG, "user has no KRB5CCNAME environment");
1892                 }
1893
1894                 strncpy(request.data.logoff.user, user,
1895                         sizeof(request.data.logoff.user) - 1);
1896
1897                 if (ccname) {
1898                         strncpy(request.data.logoff.krb5ccname, ccname,
1899                                 sizeof(request.data.logoff.krb5ccname) - 1);
1900                 }
1901
1902                 pwd = getpwnam(user);
1903                 if (pwd == NULL) {
1904                         retval = PAM_USER_UNKNOWN;
1905                         goto out;
1906                 }
1907                 request.data.logoff.uid = pwd->pw_uid;
1908
1909                 request.flags = WBFLAG_PAM_KRB5 | WBFLAG_PAM_CONTACT_TRUSTDOM;
1910
1911                 retval = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_LOGOFF, &request, &response, user);
1912         }
1913
1914 out:
1915         if (d) {
1916                 iniparser_freedict(d);
1917         }
1918
1919         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", pamh, ctrl, retval);
1920
1921         return retval;
1922 }
1923
1924 /**
1925  * evaluate whether we need to re-authenticate with kerberos after a password change
1926  *
1927  * @param pamh PAM handle
1928  * @param ctrl PAM winbind options.
1929  * @param user The username
1930  *
1931  * @return boolean Returns True if required, False if not.
1932  */
1933
1934 static BOOL _pam_require_krb5_auth_after_chauthtok(pam_handle_t *pamh, int ctrl, const char *user)
1935 {
1936
1937         /* Make sure that we only do this if
1938          * a) the chauthtok got initiated during a logon attempt (authenticate->acct_mgmt->chauthtok)
1939          * b) any later password change via the "passwd" command if done by the user itself
1940          */
1941
1942         char *new_authtok_reqd_during_auth = NULL;
1943         struct passwd *pwd = NULL;
1944
1945         if (!(ctrl & WINBIND_KRB5_AUTH)) {
1946                 return False;
1947         }
1948
1949         _pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH, &new_authtok_reqd_during_auth);
1950         pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH, NULL, NULL);
1951
1952         if (new_authtok_reqd_during_auth) {
1953                 return True;
1954         }
1955
1956         pwd = getpwnam(user);
1957         if (!pwd) {
1958                 return False;
1959         }
1960
1961         if (getuid() == pwd->pw_uid) {
1962                 return True;
1963         }
1964
1965         return False;
1966 }
1967
1968
1969 PAM_EXTERN
1970 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
1971                      int argc, const char **argv)
1972 {
1973         unsigned int lctrl;
1974         int ret;
1975         unsigned int ctrl;
1976
1977         /* <DO NOT free() THESE> */
1978         const char *user;
1979         char *pass_old, *pass_new;
1980         /* </DO NOT free() THESE> */
1981
1982         char *Announce;
1983
1984         int retry = 0;
1985         dictionary *d = NULL;
1986         char *username_ret = NULL;
1987         struct winbindd_response response;
1988
1989         ZERO_STRUCT(response);
1990
1991         ctrl = _pam_parse(pamh, flags, argc, argv, &d);
1992         if (ctrl == -1) {
1993                 ret = PAM_SYSTEM_ERR;
1994                 goto out;
1995         }
1996
1997         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", pamh, ctrl, flags);
1998
1999         /* clearing offline bit for the auth in the password change */
2000         ctrl &= ~WINBIND_CACHED_LOGIN;
2001
2002         /*
2003          * First get the name of a user
2004          */
2005         ret = pam_get_user(pamh, &user, "Username: ");
2006         if (ret) {
2007                 _pam_log(pamh, ctrl, LOG_ERR,
2008                          "password - could not identify user");
2009                 goto out;
2010         }
2011
2012         if (user == NULL) {
2013                 _pam_log(pamh, ctrl, LOG_ERR, "username was NULL!");
2014                 ret = PAM_USER_UNKNOWN;
2015                 goto out;
2016         }
2017
2018         _pam_log_debug(pamh, ctrl, LOG_DEBUG, "username [%s] obtained", user);
2019
2020         /* check if this is really a user in winbindd, not only in NSS */
2021         ret = valid_user(pamh, ctrl, user);
2022         switch (ret) {
2023                 case 1:
2024                         ret = PAM_USER_UNKNOWN;
2025                         goto out;
2026                 case -1:
2027                         ret = PAM_SYSTEM_ERR;
2028                         goto out;
2029                 default:
2030                         break;
2031         }
2032
2033         /*
2034          * obtain and verify the current password (OLDAUTHTOK) for
2035          * the user.
2036          */
2037
2038         if (flags & PAM_PRELIM_CHECK) {
2039                 time_t pwdlastset_prelim = 0;
2040
2041                 /* instruct user what is happening */
2042 #define greeting "Changing password for "
2043                 Announce = (char *) malloc(sizeof(greeting) + strlen(user));
2044                 if (Announce == NULL) {
2045                         _pam_log(pamh, ctrl, LOG_CRIT, "password - out of memory");
2046                         ret = PAM_BUF_ERR;
2047                         goto out;
2048                 }
2049                 (void) strcpy(Announce, greeting);
2050                 (void) strcpy(Announce + sizeof(greeting) - 1, user);
2051 #undef greeting
2052
2053                 lctrl = ctrl | WINBIND__OLD_PASSWORD;
2054                 ret = _winbind_read_password(pamh, lctrl,
2055                                                 Announce,
2056                                                 "(current) NT password: ",
2057                                                 NULL,
2058                                                 (const char **) &pass_old);
2059                 if (ret != PAM_SUCCESS) {
2060                         _pam_log(pamh, ctrl, LOG_NOTICE, "password - (old) token not obtained");
2061                         goto out;
2062                 }
2063
2064                 /* verify that this is the password for this user */
2065
2066                 ret = winbind_auth_request(pamh, ctrl, user, pass_old,
2067                                         NULL, NULL, &response, &pwdlastset_prelim, NULL);
2068
2069                 if (ret != PAM_ACCT_EXPIRED &&
2070                     ret != PAM_AUTHTOK_EXPIRED &&
2071                     ret != PAM_NEW_AUTHTOK_REQD &&
2072                     ret != PAM_SUCCESS) {
2073                         pass_old = NULL;
2074                         goto out;
2075                 }
2076
2077                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET, (void *)pwdlastset_prelim, NULL);
2078
2079                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK, (const void *) pass_old);
2080                 pass_old = NULL;
2081                 if (ret != PAM_SUCCESS) {
2082                         _pam_log(pamh, ctrl, LOG_CRIT, "failed to set PAM_OLDAUTHTOK");
2083                 }
2084         } else if (flags & PAM_UPDATE_AUTHTOK) {
2085
2086                 time_t pwdlastset_update = 0;
2087
2088                 /*
2089                  * obtain the proposed password
2090                  */
2091
2092                 /*
2093                  * get the old token back.
2094                  */
2095
2096                 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
2097
2098                 if (ret != PAM_SUCCESS) {
2099                         _pam_log(pamh, ctrl, LOG_NOTICE, "user not authenticated");
2100                         goto out;
2101                 }
2102
2103                 lctrl = ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
2104
2105                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
2106                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
2107                 }
2108                 retry = 0;
2109                 ret = PAM_AUTHTOK_ERR;
2110                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
2111                         /*
2112                          * use_authtok is to force the use of a previously entered
2113                          * password -- needed for pluggable password strength checking
2114                          */
2115
2116                         ret = _winbind_read_password(pamh, lctrl,
2117                                                         NULL,
2118                                                         "Enter new NT password: ",
2119                                                         "Retype new NT password: ",
2120                                                         (const char **) &pass_new);
2121
2122                         if (ret != PAM_SUCCESS) {
2123                                 _pam_log_debug(pamh, ctrl, LOG_ALERT
2124                                          ,"password - new password not obtained");
2125                                 pass_old = NULL;/* tidy up */
2126                                 goto out;
2127                         }
2128
2129                         /*
2130                          * At this point we know who the user is and what they
2131                          * propose as their new password. Verify that the new
2132                          * password is acceptable.
2133                          */
2134
2135                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
2136                                 pass_new = NULL;
2137                         }
2138                 }
2139
2140                 /*
2141                  * By reaching here we have approved the passwords and must now
2142                  * rebuild the password database file.
2143                  */
2144                 _pam_get_data( pamh, PAM_WINBIND_PWD_LAST_SET,
2145                                &pwdlastset_update);
2146
2147                 ret = winbind_chauthtok_request(pamh, ctrl, user, pass_old, pass_new, pwdlastset_update);
2148                 if (ret) {
2149                         _pam_overwrite(pass_new);
2150                         _pam_overwrite(pass_old);
2151                         pass_old = pass_new = NULL;
2152                         goto out;
2153                 }
2154
2155                 if (_pam_require_krb5_auth_after_chauthtok(pamh, ctrl, user)) {
2156
2157                         const char *member = get_member_from_config(pamh, argc, argv, ctrl, d);
2158                         const char *cctype = get_krb5_cc_type_from_config(pamh, argc, argv, ctrl, d);
2159
2160                         ret = winbind_auth_request(pamh, ctrl, user, pass_new,
2161                                                         member, cctype, &response, NULL, &username_ret);
2162                         _pam_overwrite(pass_new);
2163                         _pam_overwrite(pass_old);
2164                         pass_old = pass_new = NULL;
2165
2166                         if (ret == PAM_SUCCESS) {
2167
2168                                 /* warn a user if the password is about to expire soon */
2169                                 _pam_warn_password_expiry(pamh, ctrl, &response, NULL);
2170
2171                                 /* set some info3 info for other modules in the stack */
2172                                 _pam_set_data_info3(pamh, ctrl, &response);
2173
2174                                 /* put krb5ccname into env */
2175                                 _pam_setup_krb5_env(pamh, ctrl, response.data.auth.krb5ccname);
2176
2177                                 if (username_ret) {
2178                                         pam_set_item (pamh, PAM_USER, username_ret);
2179                                         _pam_log_debug(pamh, ctrl, LOG_INFO, "Returned user was '%s'", username_ret);
2180                                         free(username_ret);
2181                                 }
2182                         }
2183
2184                         goto out;
2185                 }
2186         } else {
2187                 ret = PAM_SERVICE_ERR;
2188         }
2189
2190 out:
2191         if (d) {
2192                 iniparser_freedict(d);
2193         }
2194
2195         /* Deal with offline errors. */
2196         PAM_WB_REMARK_CHECK_RESPONSE(pamh, ctrl, response, "NT_STATUS_NO_LOGON_SERVERS");
2197         PAM_WB_REMARK_CHECK_RESPONSE(pamh, ctrl, response, "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND");
2198         PAM_WB_REMARK_CHECK_RESPONSE(pamh, ctrl, response, "NT_STATUS_ACCESS_DENIED");
2199
2200         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", pamh, ctrl, ret);
2201
2202         return ret;
2203 }
2204
2205 #ifdef PAM_STATIC
2206
2207 /* static module data */
2208
2209 struct pam_module _pam_winbind_modstruct = {
2210         MODULE_NAME,
2211         pam_sm_authenticate,
2212         pam_sm_setcred,
2213         pam_sm_acct_mgmt,
2214         pam_sm_open_session,
2215         pam_sm_close_session,
2216         pam_sm_chauthtok
2217 };
2218
2219 #endif
2220
2221 /*
2222  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
2223  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
2224  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
2225  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2007
2226  * Copyright (c) Jan Rêkorajski 1999.
2227  * Copyright (c) Andrew G. Morgan 1996-8.
2228  * Copyright (c) Alex O. Yuriev, 1996.
2229  * Copyright (c) Cristian Gafton 1996.
2230  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
2231  *
2232  * Redistribution and use in source and binary forms, with or without
2233  * modification, are permitted provided that the following conditions
2234  * are met:
2235  * 1. Redistributions of source code must retain the above copyright
2236  *    notice, and the entire permission notice in its entirety,
2237  *    including the disclaimer of warranties.
2238  * 2. Redistributions in binary form must reproduce the above copyright
2239  *    notice, this list of conditions and the following disclaimer in the
2240  *    documentation and/or other materials provided with the distribution.
2241  * 3. The name of the author may not be used to endorse or promote
2242  *    products derived from this software without specific prior
2243  *    written permission.
2244  *
2245  * ALTERNATIVELY, this product may be distributed under the terms of
2246  * the GNU Public License, in which case the provisions of the GPL are
2247  * required INSTEAD OF the above restrictions.  (This clause is
2248  * necessary due to a potential bad interaction between the GPL and
2249  * the restrictions contained in a BSD-style copyright.)
2250  *
2251  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
2252  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
2253  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
2254  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
2255  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
2256  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
2257  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2258  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
2259  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
2260  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
2261  * OF THE POSSIBILITY OF SUCH DAMAGE.
2262  */