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