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> 2005-2008
   7
   8    largely based on pam_userdb by Cristian Gafton <gafton@redhat.com> also
   9    contains large slabs of code from pam_unix by Elliot Lee
  10    <sopwith@redhat.com> (see copyright below for full details)
  11 */
  12
  13 #include "pam_winbind.h"
  14
  15 enum pam_winbind_request_type
  16 {
  17         PAM_WINBIND_AUTHENTICATE,
  18         PAM_WINBIND_SETCRED,
  19         PAM_WINBIND_ACCT_MGMT,
  20         PAM_WINBIND_OPEN_SESSION,
  21         PAM_WINBIND_CLOSE_SESSION,
  22         PAM_WINBIND_CHAUTHTOK,
  23         PAM_WINBIND_CLEANUP
  24 };
  25
  26 static int wbc_error_to_pam_error(wbcErr status)
  27 {
  28         switch (status) {
  29                 case WBC_ERR_SUCCESS:
  30                         return PAM_SUCCESS;
  31                 case WBC_ERR_NOT_IMPLEMENTED:
  32                         return PAM_SERVICE_ERR;
  33                 case WBC_ERR_UNKNOWN_FAILURE:
  34                         break;
  35                 case WBC_ERR_NO_MEMORY:
  36                         return PAM_BUF_ERR;
  37                 case WBC_ERR_INVALID_SID:
  38                 case WBC_ERR_INVALID_PARAM:
  39                         break;
  40                 case WBC_ERR_WINBIND_NOT_AVAILABLE:
  41                         return PAM_AUTHINFO_UNAVAIL;
  42                 case WBC_ERR_DOMAIN_NOT_FOUND:
  43                         return PAM_AUTHINFO_UNAVAIL;
  44                 case WBC_ERR_INVALID_RESPONSE:
  45                         return PAM_BUF_ERR;
  46                 case WBC_ERR_NSS_ERROR:
  47                         return PAM_USER_UNKNOWN;
  48                 case WBC_ERR_AUTH_ERROR:
  49                         return PAM_AUTH_ERR;
  50                 case WBC_ERR_UNKNOWN_USER:
  51                         return PAM_USER_UNKNOWN;
  52                 case WBC_ERR_UNKNOWN_GROUP:
  53                         return PAM_USER_UNKNOWN;
  54                 case WBC_ERR_PWD_CHANGE_FAILED:
  55                         break;
  56         }
  57
  58         /* be paranoid */
  59         return PAM_AUTH_ERR;
  60 }
  61
  62 static const char *_pam_error_code_str(int err)
  63 {
  64         switch (err) {
  65                 case PAM_SUCCESS:
  66                         return "PAM_SUCCESS";
  67                 case PAM_OPEN_ERR:
  68                         return "PAM_OPEN_ERR";
  69                 case PAM_SYMBOL_ERR:
  70                         return "PAM_SYMBOL_ERR";
  71                 case PAM_SERVICE_ERR:
  72                         return "PAM_SERVICE_ERR";
  73                 case PAM_SYSTEM_ERR:
  74                         return "PAM_SYSTEM_ERR";
  75                 case PAM_BUF_ERR:
  76                         return "PAM_BUF_ERR";
  77                 case PAM_PERM_DENIED:
  78                         return "PAM_PERM_DENIED";
  79                 case PAM_AUTH_ERR:
  80                         return "PAM_AUTH_ERR";
  81                 case PAM_CRED_INSUFFICIENT:
  82                         return "PAM_CRED_INSUFFICIENT";
  83                 case PAM_AUTHINFO_UNAVAIL:
  84                         return "PAM_AUTHINFO_UNAVAIL";
  85                 case PAM_USER_UNKNOWN:
  86                         return "PAM_USER_UNKNOWN";
  87                 case PAM_MAXTRIES:
  88                         return "PAM_MAXTRIES";
  89                 case PAM_NEW_AUTHTOK_REQD:
  90                         return "PAM_NEW_AUTHTOK_REQD";
  91                 case PAM_ACCT_EXPIRED:
  92                         return "PAM_ACCT_EXPIRED";
  93                 case PAM_SESSION_ERR:
  94                         return "PAM_SESSION_ERR";
  95                 case PAM_CRED_UNAVAIL:
  96                         return "PAM_CRED_UNAVAIL";
  97                 case PAM_CRED_EXPIRED:
  98                         return "PAM_CRED_EXPIRED";
  99                 case PAM_CRED_ERR:
 100                         return "PAM_CRED_ERR";
 101                 case PAM_NO_MODULE_DATA:
 102                         return "PAM_NO_MODULE_DATA";
 103                 case PAM_CONV_ERR:
 104                         return "PAM_CONV_ERR";
 105                 case PAM_AUTHTOK_ERR:
 106                         return "PAM_AUTHTOK_ERR";
 107                 case PAM_AUTHTOK_RECOVER_ERR:
 108                         return "PAM_AUTHTOK_RECOVER_ERR";
 109                 case PAM_AUTHTOK_LOCK_BUSY:
 110                         return "PAM_AUTHTOK_LOCK_BUSY";
 111                 case PAM_AUTHTOK_DISABLE_AGING:
 112                         return "PAM_AUTHTOK_DISABLE_AGING";
 113                 case PAM_TRY_AGAIN:
 114                         return "PAM_TRY_AGAIN";
 115                 case PAM_IGNORE:
 116                         return "PAM_IGNORE";
 117                 case PAM_ABORT:
 118                         return "PAM_ABORT";
 119                 case PAM_AUTHTOK_EXPIRED:
 120                         return "PAM_AUTHTOK_EXPIRED";
 121 #ifdef PAM_MODULE_UNKNOWN
 122                 case PAM_MODULE_UNKNOWN:
 123                         return "PAM_MODULE_UNKNOWN";
 124 #endif
 125 #ifdef PAM_BAD_ITEM
 126                 case PAM_BAD_ITEM:
 127                         return "PAM_BAD_ITEM";
 128 #endif
 129 #ifdef PAM_CONV_AGAIN
 130                 case PAM_CONV_AGAIN:
 131                         return "PAM_CONV_AGAIN";
 132 #endif
 133 #ifdef PAM_INCOMPLETE
 134                 case PAM_INCOMPLETE:
 135                         return "PAM_INCOMPLETE";
 136 #endif
 137                 default:
 138                         return NULL;
 139         }
 140 }
 141
 142 #define _PAM_LOG_FUNCTION_ENTER(function, ctx) \
 143         do { \
 144                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] ENTER: " \
 145                                function " (flags: 0x%04x)", ctx->pamh, ctx->flags); \
 146                 _pam_log_state(ctx); \
 147         } while (0)
 148
 149 #define _PAM_LOG_FUNCTION_LEAVE(function, ctx, retval) \
 150         do { \
 151                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] LEAVE: " \
 152                                function " returning %d (%s)", ctx ? ctx->pamh : NULL, retval, \
 153                                _pam_error_code_str(retval)); \
 154                 _pam_log_state(ctx); \
 155         } while (0)
 156
 157 /* data tokens */
 158
 159 #define MAX_PASSWD_TRIES        3
 160
 161 #ifdef HAVE_GETTEXT
 162 static char initialized = 0;
 163
 164 static inline void textdomain_init(void);
 165 static inline void textdomain_init(void)
 166 {
 167         if (!initialized) {
 168                 bindtextdomain(MODULE_NAME, LOCALEDIR);
 169                 initialized = 1;
 170         }
 171         return;
 172 }
 173 #endif
 174
 175
 176 /* some syslogging */
 177 static void _pam_log_int(const pam_handle_t *pamh,
 178                          int err,
 179                          const char *format,
 180                          va_list args) PRINTF_ATTRIBUTE(3, 0);
 181
 182 #ifdef HAVE_PAM_VSYSLOG
 183 static void _pam_log_int(const pam_handle_t *pamh,
 184                          int err,
 185                          const char *format,
 186                          va_list args)
 187 {
 188         pam_vsyslog(pamh, err, format, args);
 189 }
 190 #else
 191 static void _pam_log_int(const pam_handle_t *pamh,
 192                          int err,
 193                          const char *format,
 194                          va_list args)
 195 {
 196         char *base = NULL;
 197         va_list args2;
 198         const char *service;
 199         int ret;
 200
 201         va_copy(args2, args);
 202
 203         pam_get_item(pamh, PAM_SERVICE, (const void **) &service);
 204
 205         ret = vasprintf(&base, format, args);
 206         if (ret == -1) {
 207                 /* what else todo ? */
 208                 vsyslog(err, format, args2);
 209                 va_end(args2);
 210                 return;
 211         }
 212
 213         syslog(err, "%s(%s): %s", MODULE_NAME, service, base);
 214         SAFE_FREE(base);
 215         va_end(args2);
 216 }
 217 #endif /* HAVE_PAM_VSYSLOG */
 218
 219 static bool _pam_log_is_silent(int ctrl)
 220 {
 221         return on(ctrl, WINBIND_SILENT);
 222 }
 223
 224 static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 225 static void _pam_log(struct pwb_context *r, int err, const char *format, ...)
 226 {
 227         va_list args;
 228
 229         if (_pam_log_is_silent(r->ctrl)) {
 230                 return;
 231         }
 232
 233         va_start(args, format);
 234         _pam_log_int(r->pamh, err, format, args);
 235         va_end(args);
 236 }
 237 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 238 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 239 {
 240         va_list args;
 241
 242         if (_pam_log_is_silent(ctrl)) {
 243                 return;
 244         }
 245
 246         va_start(args, format);
 247         _pam_log_int(pamh, err, format, args);
 248         va_end(args);
 249 }
 250
 251 static bool _pam_log_is_debug_enabled(int ctrl)
 252 {
 253         if (ctrl == -1) {
 254                 return false;
 255         }
 256
 257         if (_pam_log_is_silent(ctrl)) {
 258                 return false;
 259         }
 260
 261         if (!(ctrl & WINBIND_DEBUG_ARG)) {
 262                 return false;
 263         }
 264
 265         return true;
 266 }
 267
 268 static bool _pam_log_is_debug_state_enabled(int ctrl)
 269 {
 270         if (!(ctrl & WINBIND_DEBUG_STATE)) {
 271                 return false;
 272         }
 273
 274         return _pam_log_is_debug_enabled(ctrl);
 275 }
 276
 277 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 278 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...)
 279 {
 280         va_list args;
 281
 282         if (!r || !_pam_log_is_debug_enabled(r->ctrl)) {
 283                 return;
 284         }
 285
 286         va_start(args, format);
 287         _pam_log_int(r->pamh, err, format, args);
 288         va_end(args);
 289 }
 290 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 291 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 292 {
 293         va_list args;
 294
 295         if (!_pam_log_is_debug_enabled(ctrl)) {
 296                 return;
 297         }
 298
 299         va_start(args, format);
 300         _pam_log_int(pamh, err, format, args);
 301         va_end(args);
 302 }
 303
 304 static void _pam_log_state_datum(struct pwb_context *ctx,
 305                                  int item_type,
 306                                  const char *key,
 307                                  int is_string)
 308 {
 309         const void *data = NULL;
 310         if (item_type != 0) {
 311                 pam_get_item(ctx->pamh, item_type, &data);
 312         } else {
 313                 pam_get_data(ctx->pamh, key, &data);
 314         }
 315         if (data != NULL) {
 316                 const char *type = (item_type != 0) ? "ITEM" : "DATA";
 317                 if (is_string != 0) {
 318                         _pam_log_debug(ctx, LOG_DEBUG,
 319                                        "[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
 320                                        ctx->pamh, type, key, (const char *)data,
 321                                        data);
 322                 } else {
 323                         _pam_log_debug(ctx, LOG_DEBUG,
 324                                        "[pamh: %p] STATE: %s(%s) = %p",
 325                                        ctx->pamh, type, key, data);
 326                 }
 327         }
 328 }
 329
 330 #define _PAM_LOG_STATE_DATA_POINTER(ctx, module_data_name) \
 331         _pam_log_state_datum(ctx, 0, module_data_name, 0)
 332
 333 #define _PAM_LOG_STATE_DATA_STRING(ctx, module_data_name) \
 334         _pam_log_state_datum(ctx, 0, module_data_name, 1)
 335
 336 #define _PAM_LOG_STATE_ITEM_POINTER(ctx, item_type) \
 337         _pam_log_state_datum(ctx, item_type, #item_type, 0)
 338
 339 #define _PAM_LOG_STATE_ITEM_STRING(ctx, item_type) \
 340         _pam_log_state_datum(ctx, item_type, #item_type, 1)
 341
 342 #ifdef DEBUG_PASSWORD
 343 #define _LOG_PASSWORD_AS_STRING 1
 344 #else
 345 #define _LOG_PASSWORD_AS_STRING 0
 346 #endif
 347
 348 #define _PAM_LOG_STATE_ITEM_PASSWORD(ctx, item_type) \
 349         _pam_log_state_datum(ctx, item_type, #item_type, \
 350                              _LOG_PASSWORD_AS_STRING)
 351 /*
 352  * wrapper to preserve old behaviour of iniparser which ignored
 353  * key values that had no value assigned like
 354  *    key =
 355  * for a key like above newer iniparser will return a zero-length
 356  * string, previously iniparser would return NULL
 357  *
 358  * JRA: For compatibility, tiniparser behaves like iniparser.
 359  */
 360 static const char *tiniparser_getstring_nonempty(struct tiniparser_dictionary *d,
 361                         const char *key,
 362                         const char *def)
 363 {
 364         const char *ret = tiniparser_getstring(d, key, def);
 365         if (ret && strlen(ret) == 0) {
 366                 ret = NULL;
 367         }
 368         return ret;
 369 }
 370
 371 static void _pam_log_state(struct pwb_context *ctx)
 372 {
 373         if (!ctx || !_pam_log_is_debug_state_enabled(ctx->ctrl)) {
 374                 return;
 375         }
 376
 377         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
 378         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
 379         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
 380         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
 381         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
 382         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
 383         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
 384         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
 385         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
 386 #ifdef PAM_FAIL_DELAY
 387         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
 388 #endif
 389 #ifdef PAM_REPOSITORY
 390         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
 391 #endif
 392
 393         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
 394         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
 395         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
 396         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
 397         _PAM_LOG_STATE_DATA_STRING(ctx,
 398                                    PAM_WINBIND_NEW_AUTHTOK_REQD);
 399                                    /* Use atoi to get PAM result code */
 400         _PAM_LOG_STATE_DATA_STRING(ctx,
 401                                    PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
 402         _PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
 403 }
 404
 405 static int _pam_parse(const pam_handle_t *pamh,
 406                       int flags,
 407                       int argc,
 408                       const char **argv,
 409                       enum pam_winbind_request_type type,
 410                       struct tiniparser_dictionary **result_d)
 411 {
 412         int ctrl = 0;
 413         const char *config_file = NULL;
 414         int i;
 415         const char **v;
 416         struct tiniparser_dictionary *d = NULL;
 417
 418         if (flags & PAM_SILENT) {
 419                 ctrl |= WINBIND_SILENT;
 420         }
 421
 422         for (i=argc,v=argv; i-- > 0; ++v) {
 423                 if (!strncasecmp(*v, "config", strlen("config"))) {
 424                         ctrl |= WINBIND_CONFIG_FILE;
 425                         config_file = v[i];
 426                         break;
 427                 }
 428         }
 429
 430         if (config_file == NULL) {
 431                 config_file = PAM_WINBIND_CONFIG_FILE;
 432         }
 433
 434         d = tiniparser_load(config_file);
 435         if (d == NULL) {
 436                 goto config_from_pam;
 437         }
 438
 439         if (tiniparser_getboolean(d, "global:debug", false)) {
 440                 ctrl |= WINBIND_DEBUG_ARG;
 441         }
 442
 443         if (tiniparser_getboolean(d, "global:debug_state", false)) {
 444                 ctrl |= WINBIND_DEBUG_STATE;
 445         }
 446
 447         if (tiniparser_getboolean(d, "global:cached_login", false)) {
 448                 ctrl |= WINBIND_CACHED_LOGIN;
 449         }
 450
 451         if (tiniparser_getboolean(d, "global:krb5_auth", false)) {
 452                 ctrl |= WINBIND_KRB5_AUTH;
 453         }
 454
 455         if (tiniparser_getboolean(d, "global:silent", false)) {
 456                 ctrl |= WINBIND_SILENT;
 457         }
 458
 459         if (tiniparser_getstring_nonempty(d, "global:krb5_ccache_type", NULL) != NULL) {
 460                 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 461         }
 462
 463         if ((tiniparser_getstring_nonempty(d, "global:require-membership-of", NULL)
 464              != NULL) ||
 465             (tiniparser_getstring_nonempty(d, "global:require_membership_of", NULL)
 466              != NULL)) {
 467                 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 468         }
 469
 470         if (tiniparser_getboolean(d, "global:try_first_pass", false)) {
 471                 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 472         }
 473
 474         if (tiniparser_getint(d, "global:warn_pwd_expire", 0)) {
 475                 ctrl |= WINBIND_WARN_PWD_EXPIRE;
 476         }
 477
 478         if (tiniparser_getboolean(d, "global:mkhomedir", false)) {
 479                 ctrl |= WINBIND_MKHOMEDIR;
 480         }
 481
 482 config_from_pam:
 483         /* step through arguments */
 484         for (i=argc,v=argv; i-- > 0; ++v) {
 485
 486                 /* generic options */
 487                 if (!strcmp(*v,"debug"))
 488                         ctrl |= WINBIND_DEBUG_ARG;
 489                 else if (!strcasecmp(*v, "debug_state"))
 490                         ctrl |= WINBIND_DEBUG_STATE;
 491                 else if (!strcasecmp(*v, "silent"))
 492                         ctrl |= WINBIND_SILENT;
 493                 else if (!strcasecmp(*v, "use_authtok"))
 494                         ctrl |= WINBIND_USE_AUTHTOK_ARG;
 495                 else if (!strcasecmp(*v, "try_authtok"))
 496                         ctrl |= WINBIND_TRY_AUTHTOK_ARG;
 497                 else if (!strcasecmp(*v, "use_first_pass"))
 498                         ctrl |= WINBIND_USE_FIRST_PASS_ARG;
 499                 else if (!strcasecmp(*v, "try_first_pass"))
 500                         ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 501                 else if (!strcasecmp(*v, "unknown_ok"))
 502                         ctrl |= WINBIND_UNKNOWN_OK_ARG;
 503                 else if ((type == PAM_WINBIND_AUTHENTICATE
 504                           || type == PAM_WINBIND_SETCRED)
 505                          && !strncasecmp(*v, "require_membership_of",
 506                                          strlen("require_membership_of")))
 507                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 508                 else if ((type == PAM_WINBIND_AUTHENTICATE
 509                           || type == PAM_WINBIND_SETCRED)
 510                          && !strncasecmp(*v, "require-membership-of",
 511                                          strlen("require-membership-of")))
 512                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 513                 else if (!strcasecmp(*v, "krb5_auth"))
 514                         ctrl |= WINBIND_KRB5_AUTH;
 515                 else if (!strncasecmp(*v, "krb5_ccache_type",
 516                                       strlen("krb5_ccache_type")))
 517                         ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 518                 else if (!strcasecmp(*v, "cached_login"))
 519                         ctrl |= WINBIND_CACHED_LOGIN;
 520                 else if (!strcasecmp(*v, "mkhomedir"))
 521                         ctrl |= WINBIND_MKHOMEDIR;
 522                 else if (!strncasecmp(*v, "warn_pwd_expire",
 523                         strlen("warn_pwd_expire")))
 524                         ctrl |= WINBIND_WARN_PWD_EXPIRE;
 525                 else if (type != PAM_WINBIND_CLEANUP) {
 526                         __pam_log(pamh, ctrl, LOG_ERR,
 527                                  "pam_parse: unknown option: %s", *v);
 528                         return -1;
 529                 }
 530
 531         }
 532
 533         if (result_d) {
 534                 *result_d = d;
 535         } else {
 536                 if (d) {
 537                         tiniparser_freedict(d);
 538                 }
 539         }
 540
 541         return ctrl;
 542 };
 543
 544 static int _pam_winbind_free_context(struct pwb_context *ctx)
 545 {
 546         if (!ctx) {
 547                 return 0;
 548         }
 549
 550         if (ctx->dict) {
 551                 tiniparser_freedict(ctx->dict);
 552         }
 553
 554         wbcCtxFree(ctx->wbc_ctx);
 555
 556         return 0;
 557 }
 558
 559 static int _pam_winbind_init_context(pam_handle_t *pamh,
 560                                      int flags,
 561                                      int argc,
 562                                      const char **argv,
 563                                      enum pam_winbind_request_type type,
 564                                      struct pwb_context **ctx_p)
 565 {
 566         struct pwb_context *r = NULL;
 567         const char *service = NULL;
 568         char service_name[32] = {0};
 569         int ctrl_code;
 570
 571 #ifdef HAVE_GETTEXT
 572         textdomain_init();
 573 #endif
 574
 575         r = talloc_zero(NULL, struct pwb_context);
 576         if (!r) {
 577                 return PAM_BUF_ERR;
 578         }
 579
 580         talloc_set_destructor(r, _pam_winbind_free_context);
 581
 582         r->pamh = pamh;
 583         r->flags = flags;
 584         r->argc = argc;
 585         r->argv = argv;
 586         ctrl_code = _pam_parse(pamh, flags, argc, argv, type, &r->dict);
 587         if (ctrl_code == -1) {
 588                 TALLOC_FREE(r);
 589                 return PAM_SYSTEM_ERR;
 590         }
 591         r->ctrl = ctrl_code;
 592
 593         r->wbc_ctx = wbcCtxCreate();
 594         if (r->wbc_ctx == NULL) {
 595                 TALLOC_FREE(r);
 596                 return PAM_SYSTEM_ERR;
 597         }
 598
 599         pam_get_item(pamh, PAM_SERVICE, (const void **)&service);
 600
 601         snprintf(service_name, sizeof(service_name), "PAM_WINBIND[%s]", service);
 602
 603         wbcSetClientProcessName(service_name);
 604
 605         *ctx_p = r;
 606
 607         return PAM_SUCCESS;
 608 }
 609
 610 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
 611                                       void *data,
 612                                       int error_status)
 613 {
 614         int ctrl = _pam_parse(pamh, 0, 0, NULL, PAM_WINBIND_CLEANUP, NULL);
 615         if (_pam_log_is_debug_state_enabled(ctrl)) {
 616                 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
 617                                "[pamh: %p] CLEAN: cleaning up PAM data %p "
 618                                "(error_status = %d)", pamh, data,
 619                                error_status);
 620         }
 621         TALLOC_FREE(data);
 622 }
 623
 624
 625 static const struct ntstatus_errors {
 626         const char *ntstatus_string;
 627         const char *error_string;
 628 } ntstatus_errors[] = {
 629         {"NT_STATUS_OK",
 630                 N_("Success")},
 631         {"NT_STATUS_BACKUP_CONTROLLER",
 632                 N_("No primary Domain Controller available")},
 633         {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
 634                 N_("No domain controllers found")},
 635         {"NT_STATUS_NO_LOGON_SERVERS",
 636                 N_("No logon servers")},
 637         {"NT_STATUS_PWD_TOO_SHORT",
 638                 N_("Password too short")},
 639         {"NT_STATUS_PWD_TOO_RECENT",
 640                 N_("The password of this user is too recent to change")},
 641         {"NT_STATUS_PWD_HISTORY_CONFLICT",
 642                 N_("Password is already in password history")},
 643         {"NT_STATUS_PASSWORD_EXPIRED",
 644                 N_("Your password has expired")},
 645         {"NT_STATUS_PASSWORD_MUST_CHANGE",
 646                 N_("You need to change your password now")},
 647         {"NT_STATUS_INVALID_WORKSTATION",
 648                 N_("You are not allowed to logon from this workstation")},
 649         {"NT_STATUS_INVALID_LOGON_HOURS",
 650                 N_("You are not allowed to logon at this time")},
 651         {"NT_STATUS_ACCOUNT_EXPIRED",
 652                 N_("Your account has expired. "
 653                    "Please contact your System administrator")}, /* SCNR */
 654         {"NT_STATUS_ACCOUNT_DISABLED",
 655                 N_("Your account is disabled. "
 656                    "Please contact your System administrator")}, /* SCNR */
 657         {"NT_STATUS_ACCOUNT_LOCKED_OUT",
 658                 N_("Your account has been locked. "
 659                    "Please contact your System administrator")}, /* SCNR */
 660         {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
 661                 N_("Invalid Trust Account")},
 662         {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
 663                 N_("Invalid Trust Account")},
 664         {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
 665                 N_("Invalid Trust Account")},
 666         {"NT_STATUS_ACCESS_DENIED",
 667                 N_("Access is denied")},
 668         {NULL, NULL}
 669 };
 670
 671 static const char *_get_ntstatus_error_string(const char *nt_status_string)
 672 {
 673         int i;
 674         for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
 675                 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
 676                                 nt_status_string)) {
 677                         return _(ntstatus_errors[i].error_string);
 678                 }
 679         }
 680         return NULL;
 681 }
 682
 683 /* --- authentication management functions --- */
 684
 685 /* Attempt a conversation */
 686
 687 static int converse(const pam_handle_t *pamh,
 688                     int nargs,
 689                     const struct pam_message **message,
 690                     struct pam_response **response)
 691 {
 692         int retval;
 693         const struct pam_conv *conv;
 694
 695         retval = pam_get_item(pamh, PAM_CONV, (const void **) &conv);
 696         if (retval == PAM_SUCCESS) {
 697                 retval = conv->conv(nargs,
 698                                     discard_const_p(const struct pam_message *, message),
 699                                     response, conv->appdata_ptr);
 700         }
 701
 702         return retval; /* propagate error status */
 703 }
 704
 705
 706 static int _make_remark(struct pwb_context *ctx,
 707                         int type,
 708                         const char *text)
 709 {
 710         int retval = PAM_SUCCESS;
 711
 712         const struct pam_message *pmsg[1];
 713         struct pam_message msg[1];
 714         struct pam_response *resp;
 715
 716         if (ctx->flags & WINBIND_SILENT) {
 717                 return PAM_SUCCESS;
 718         }
 719
 720         pmsg[0] = &msg[0];
 721         msg[0].msg = discard_const_p(char, text);
 722         msg[0].msg_style = type;
 723
 724         resp = NULL;
 725         retval = converse(ctx->pamh, 1, pmsg, &resp);
 726
 727         if (resp) {
 728                 _pam_drop_reply(resp, 1);
 729         }
 730         return retval;
 731 }
 732
 733 static int _make_remark_v(struct pwb_context *ctx,
 734                           int type,
 735                           const char *format,
 736                           va_list args) PRINTF_ATTRIBUTE(3, 0);
 737
 738 static int _make_remark_v(struct pwb_context *ctx,
 739                           int type,
 740                           const char *format,
 741                           va_list args)
 742 {
 743         char *var;
 744         int ret;
 745
 746         ret = vasprintf(&var, format, args);
 747         if (ret < 0) {
 748                 _pam_log(ctx, LOG_ERR, "memory allocation failure");
 749                 return ret;
 750         }
 751
 752         ret = _make_remark(ctx, type, var);
 753         SAFE_FREE(var);
 754         return ret;
 755 }
 756
 757 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 758 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
 759 {
 760         int ret;
 761         va_list args;
 762
 763         va_start(args, format);
 764         ret = _make_remark_v(ctx, type, format, args);
 765         va_end(args);
 766         return ret;
 767 }
 768
 769 static int pam_winbind_request_log(struct pwb_context *ctx,
 770                                    int retval,
 771                                    const char *user,
 772                                    const char *fn)
 773 {
 774         switch (retval) {
 775         case PAM_AUTH_ERR:
 776                 /* incorrect password */
 777                 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
 778                          "(incorrect password or invalid membership)", user);
 779                 return retval;
 780         case PAM_ACCT_EXPIRED:
 781                 /* account expired */
 782                 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
 783                          user);
 784                 return retval;
 785         case PAM_AUTHTOK_EXPIRED:
 786                 /* password expired */
 787                 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
 788                          user);
 789                 return retval;
 790         case PAM_NEW_AUTHTOK_REQD:
 791                 /* new password required */
 792                 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
 793                          "required", user);
 794                 return retval;
 795         case PAM_USER_UNKNOWN:
 796                 /* the user does not exist */
 797                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
 798                                user);
 799                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
 800                         return PAM_IGNORE;
 801                 }
 802                 return retval;
 803         case PAM_AUTHTOK_ERR:
 804                 /* Authentication token manipulation error */
 805                 _pam_log(ctx, LOG_WARNING, "user `%s' authentication token change failed "
 806                         "(pwd complexity/history/min_age not met?)", user);
 807                 return retval;
 808         case PAM_SUCCESS:
 809                 /* Otherwise, the authentication looked good */
 810                 if (strcmp(fn, "wbcLogonUser") == 0) {
 811                         _pam_log(ctx, LOG_NOTICE,
 812                                  "user '%s' granted access", user);
 813                 } else {
 814                         _pam_log(ctx, LOG_NOTICE,
 815                                  "user '%s' OK", user);
 816                 }
 817                 return retval;
 818         default:
 819                 /* we don't know anything about this return value */
 820                 _pam_log(ctx, LOG_ERR,
 821                          "internal module error (retval = %s(%d), user = '%s')",
 822                         _pam_error_code_str(retval), retval, user);
 823                 return retval;
 824         }
 825 }
 826
 827 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
 828                                        struct wbcAuthErrorInfo *e,
 829                                        wbcErr status,
 830                                        const char *username,
 831                                        const char *fn)
 832 {
 833         int ret = PAM_AUTH_ERR;
 834
 835         if (WBC_ERROR_IS_OK(status)) {
 836                 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
 837                         fn);
 838                 ret = PAM_SUCCESS;
 839                 return pam_winbind_request_log(ctx, ret, username, fn);
 840         }
 841
 842         if (e) {
 843                 if (e->pam_error != PAM_SUCCESS) {
 844                         _pam_log(ctx, LOG_ERR,
 845                                  "request %s failed: %s, "
 846                                  "PAM error: %s (%d), NTSTATUS: %s, "
 847                                  "Error message was: %s",
 848                                  fn,
 849                                  wbcErrorString(status),
 850                                  _pam_error_code_str(e->pam_error),
 851                                  e->pam_error,
 852                                  e->nt_string,
 853                                  e->display_string);
 854                         ret = e->pam_error;
 855                         return pam_winbind_request_log(ctx, ret, username, fn);
 856                 }
 857
 858                 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
 859
 860                 ret = PAM_SERVICE_ERR;
 861                 return pam_winbind_request_log(ctx, ret, username, fn);
 862         }
 863
 864         ret = wbc_error_to_pam_error(status);
 865         return pam_winbind_request_log(ctx, ret, username, fn);
 866 }
 867
 868 #if defined(HAVE_PAM_RADIO_TYPE)
 869 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 870 {
 871         struct pam_message msg;
 872         const struct pam_message *pmsg;
 873         struct pam_response *resp = NULL;
 874         int ret;
 875         bool retval = false;
 876         pmsg = &msg;
 877         msg.msg_style = PAM_RADIO_TYPE;
 878         msg.msg = _("Do you want to change your password now?");
 879         ret = converse(ctx->pamh, 1, &pmsg, &resp);
 880         if (resp == NULL) {
 881                 if (ret == PAM_SUCCESS) {
 882                         _pam_log(ctx, LOG_CRIT, "pam_winbind: system error!\n");
 883                         return false;
 884                 }
 885         }
 886         if (ret != PAM_SUCCESS) {
 887                 return false;
 888         }
 889         _pam_log(ctx, LOG_CRIT, "Received [%s] reply from application.\n", resp->resp);
 890
 891         if ((resp->resp != NULL) && (strcasecmp(resp->resp, "yes") == 0)) {
 892                 retval = true;
 893         }
 894
 895         _pam_drop_reply(resp, 1);
 896         return retval;
 897 }
 898 #else
 899 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 900 {
 901         return false;
 902 }
 903 #endif
 904
 905 /**
 906  * send a password expiry message if required
 907  *
 908  * @param ctx PAM winbind context.
 909  * @param next_change expected (calculated) next expiry date.
 910  * @param already_expired pointer to a boolean to indicate if the password is
 911  *        already expired.
 912  *
 913  * @return boolean Returns true if message has been sent, false if not.
 914  */
 915
 916 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
 917                                               time_t next_change,
 918                                               time_t now,
 919                                               int warn_pwd_expire,
 920                                               bool *already_expired,
 921                                               bool *change_pwd)
 922 {
 923         int days = 0;
 924         struct tm tm_now, tm_next_change;
 925         bool retval = false;
 926         int ret;
 927
 928         if (already_expired) {
 929                 *already_expired = false;
 930         }
 931
 932         if (change_pwd) {
 933                 *change_pwd = false;
 934         }
 935
 936         if (next_change <= now) {
 937                 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
 938                 if (already_expired) {
 939                         *already_expired = true;
 940                 }
 941                 return true;
 942         }
 943
 944         if ((next_change < 0) ||
 945             (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
 946                 return false;
 947         }
 948
 949         if ((localtime_r(&now, &tm_now) == NULL) ||
 950             (localtime_r(&next_change, &tm_next_change) == NULL)) {
 951                 return false;
 952         }
 953
 954         days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
 955                (tm_now.tm_yday+tm_now.tm_year*365);
 956
 957         if (days == 0) {
 958                 ret = _make_remark(ctx, PAM_TEXT_INFO,
 959                                 _("Your password expires today.\n"));
 960
 961                 /*
 962                  * If change_pwd and already_expired is null.
 963                  * We are just sending a notification message.
 964                  * We don't expect any response in this case.
 965                  */
 966
 967                 if (!change_pwd && !already_expired) {
 968                         return true;
 969                 }
 970
 971                 /*
 972                  * successfully sent the warning message.
 973                  * Give the user a chance to change pwd.
 974                  */
 975                 if (ret == PAM_SUCCESS) {
 976                         if (change_pwd) {
 977                                 retval = _pam_winbind_change_pwd(ctx);
 978                                 if (retval) {
 979                                         *change_pwd = true;
 980                                 }
 981                         }
 982                 }
 983                 return true;
 984         }
 985
 986         if (days > 0 && days < warn_pwd_expire) {
 987
 988                 ret = _make_remark_format(ctx, PAM_TEXT_INFO,
 989                                         _("Your password will expire in %d %s.\n"),
 990                                         days, (days > 1) ? _("days"):_("day"));
 991                 /*
 992                  * If change_pwd and already_expired is null.
 993                  * We are just sending a notification message.
 994                  * We don't expect any response in this case.
 995                  */
 996
 997                 if (!change_pwd && !already_expired) {
 998                         return true;
 999                 }
1000
1001                 /*
1002                  * successfully sent the warning message.
1003                  * Give the user a chance to change pwd.
1004                  */
1005                 if (ret == PAM_SUCCESS) {
1006                         if (change_pwd) {
1007                                 retval = _pam_winbind_change_pwd(ctx);
1008                                 if (retval) {
1009                                         *change_pwd = true;
1010                                 }
1011                         }
1012                 }
1013                 return true;
1014         }
1015
1016         return false;
1017 }
1018
1019 /**
1020  * Send a warning if the password expires in the near future
1021  *
1022  * @param ctx PAM winbind context.
1023  * @param response The full authentication response structure.
1024  * @param already_expired boolean, is the pwd already expired?
1025  *
1026  * @return void.
1027  */
1028
1029 static void _pam_warn_password_expiry(struct pwb_context *ctx,
1030                                       const struct wbcAuthUserInfo *info,
1031                                       int warn_pwd_expire,
1032                                       bool *already_expired,
1033                                       bool *change_pwd)
1034 {
1035         time_t now = time(NULL);
1036         time_t next_change = 0;
1037
1038         if (info == NULL) {
1039                 return;
1040         }
1041
1042         if (already_expired) {
1043                 *already_expired = false;
1044         }
1045
1046         if (change_pwd) {
1047                 *change_pwd = false;
1048         }
1049
1050         /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
1051         if (info->acct_flags & WBC_ACB_PWNOEXP) {
1052                 return;
1053         }
1054
1055         /* no point in sending a warning if this is a grace logon */
1056         if (PAM_WB_GRACE_LOGON(info->user_flags)) {
1057                 return;
1058         }
1059
1060         /* check if the info3 must change timestamp has been set */
1061         next_change = info->pass_must_change_time;
1062
1063         if (_pam_send_password_expiry_message(ctx, next_change, now,
1064                                               warn_pwd_expire,
1065                                               already_expired,
1066                                               change_pwd)) {
1067                 return;
1068         }
1069
1070         /* no warning sent */
1071 }
1072
1073 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
1074
1075 /**
1076  * Append a string, making sure not to overflow and to always return a
1077  * NULL-terminated string.
1078  *
1079  * @param dest Destination string buffer (must already be NULL-terminated).
1080  * @param src Source string buffer.
1081  * @param dest_buffer_size Size of dest buffer in bytes.
1082  *
1083  * @return false if dest buffer is not big enough (no bytes copied), true on
1084  * success.
1085  */
1086
1087 static bool safe_append_string(char *dest,
1088                                const char *src,
1089                                int dest_buffer_size)
1090 {
1091         size_t len;
1092         len = strlcat(dest, src, dest_buffer_size);
1093         return (len < dest_buffer_size);
1094 }
1095
1096 /**
1097  * Convert a names into a SID string, appending it to a buffer.
1098  *
1099  * @param ctx PAM winbind context.
1100  * @param user User in PAM request.
1101  * @param name Name to convert.
1102  * @param sid_list_buffer Where to append the string sid.
1103  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1104  *
1105  * @return false on failure, true on success.
1106  */
1107 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
1108                                        const char *user,
1109                                        const char *name,
1110                                        char *sid_list_buffer,
1111                                        int sid_list_buffer_size)
1112 {
1113         char sid_string[WBC_SID_STRING_BUFLEN];
1114
1115         /* lookup name? */
1116         if (IS_SID_STRING(name)) {
1117                 strlcpy(sid_string, name, sizeof(sid_string));
1118         } else {
1119                 wbcErr wbc_status;
1120                 struct wbcDomainSid sid;
1121                 enum wbcSidType type;
1122
1123                 _pam_log_debug(ctx, LOG_DEBUG,
1124                                "no sid given, looking up: %s\n", name);
1125
1126                 wbc_status = wbcCtxLookupName(ctx->wbc_ctx,
1127                                               "",
1128                                               name,
1129                                               &sid,
1130                                               &type);
1131                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1132                         _pam_log(ctx, LOG_INFO,
1133                                  "could not lookup name: %s\n", name);
1134                         return false;
1135                 }
1136
1137                 wbcSidToStringBuf(&sid, sid_string, sizeof(sid_string));
1138         }
1139
1140         if (!safe_append_string(sid_list_buffer, sid_string,
1141                                 sid_list_buffer_size)) {
1142                 return false;
1143         }
1144         return true;
1145 }
1146
1147 /**
1148  * Convert a list of names into a list of sids.
1149  *
1150  * @param ctx PAM winbind context.
1151  * @param user User in PAM request.
1152  * @param name_list List of names or string sids, separated by commas.
1153  * @param sid_list_buffer Where to put the list of string sids.
1154  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1155  *
1156  * @return false on failure, true on success.
1157  */
1158 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1159                                                  const char *user,
1160                                                  const char *name_list,
1161                                                  char *sid_list_buffer,
1162                                                  int sid_list_buffer_size)
1163 {
1164         bool result = false;
1165         char *current_name = NULL;
1166         const char *search_location;
1167         const char *comma;
1168         int len;
1169
1170         if (sid_list_buffer_size > 0) {
1171                 sid_list_buffer[0] = 0;
1172         }
1173
1174         search_location = name_list;
1175         while ((comma = strchr(search_location, ',')) != NULL) {
1176                 current_name = strndup(search_location,
1177                                        comma - search_location);
1178                 if (NULL == current_name) {
1179                         goto out;
1180                 }
1181
1182                 if (!winbind_name_to_sid_string(ctx, user,
1183                                                 current_name,
1184                                                 sid_list_buffer,
1185                                                 sid_list_buffer_size)) {
1186                         /*
1187                          * If one group name failed, we must not fail
1188                          * the authentication totally, continue with
1189                          * the following group names. If user belongs to
1190                          * one of the valid groups, we must allow it
1191                          * login. -- BoYang
1192                          */
1193
1194                         _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1195                                  "check if group %s is valid group.", current_name,
1196                                  current_name);
1197                         _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1198                                         "to sid, please contact your administrator to see "
1199                                         "if group %s is valid."), current_name, current_name);
1200                         SAFE_FREE(current_name);
1201                         search_location = comma + 1;
1202                         continue;
1203                 }
1204
1205                 SAFE_FREE(current_name);
1206
1207                 if (!safe_append_string(sid_list_buffer, ",",
1208                                         sid_list_buffer_size)) {
1209                         goto out;
1210                 }
1211
1212                 search_location = comma + 1;
1213         }
1214
1215         if (!winbind_name_to_sid_string(ctx, user, search_location,
1216                                         sid_list_buffer,
1217                                         sid_list_buffer_size)) {
1218                 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1219                          "check if group %s is valid group.", search_location,
1220                          search_location);
1221                 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1222                                 "to sid, please contact your administrator to see "
1223                                 "if group %s is valid."), search_location, search_location);
1224
1225                 /* If no valid groups were converted we should fail outright */
1226                 if (name_list != NULL && strlen(sid_list_buffer) == 0) {
1227                         result = false;
1228                         goto out;
1229                 }
1230                 /*
1231                  * The lookup of the last name failed..
1232                  * It results in require_member_of_sid ends with ','
1233                  * It is malformatted parameter here, overwrite the last ','.
1234                  */
1235                 len = strlen(sid_list_buffer);
1236                 if ((len != 0) && (sid_list_buffer[len - 1] == ',')) {
1237                         sid_list_buffer[len - 1] = '\0';
1238                 }
1239         }
1240
1241         result = true;
1242
1243 out:
1244         SAFE_FREE(current_name);
1245         return result;
1246 }
1247
1248 /**
1249  * put krb5ccname variable into environment
1250  *
1251  * @param ctx PAM winbind context.
1252  * @param krb5ccname env variable retrieved from winbindd.
1253  *
1254  * @return void.
1255  */
1256
1257 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1258                                 struct wbcLogonUserInfo *info)
1259 {
1260         char *var = NULL;
1261         int ret;
1262         uint32_t i;
1263         const char *krb5ccname = NULL;
1264
1265         if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1266                 return;
1267         }
1268
1269         if (!info) {
1270                 return;
1271         }
1272
1273         for (i=0; i < info->num_blobs; i++) {
1274                 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1275                         krb5ccname = (const char *)info->blobs[i].blob.data;
1276                         break;
1277                 }
1278         }
1279
1280         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1281                 return;
1282         }
1283
1284         _pam_log_debug(ctx, LOG_DEBUG,
1285                        "request returned KRB5CCNAME: %s", krb5ccname);
1286
1287         if (asprintf(&var, "KRB5CCNAME=%s", krb5ccname) == -1) {
1288                 return;
1289         }
1290
1291         ret = pam_putenv(ctx->pamh, var);
1292         if (ret != PAM_SUCCESS) {
1293                 _pam_log(ctx, LOG_ERR,
1294                          "failed to set KRB5CCNAME to %s: %s",
1295                          var, pam_strerror(ctx->pamh, ret));
1296         }
1297         free(var);
1298 }
1299
1300 /**
1301  * Copy unix username if available (further processed in PAM).
1302  *
1303  * @param ctx PAM winbind context
1304  * @param user_ret A pointer that holds a pointer to a string
1305  * @param unix_username A username
1306  *
1307  * @return void.
1308  */
1309
1310 static void _pam_setup_unix_username(struct pwb_context *ctx,
1311                                      char **user_ret,
1312                                      struct wbcLogonUserInfo *info)
1313 {
1314         const char *unix_username = NULL;
1315         uint32_t i;
1316
1317         if (!user_ret || !info) {
1318                 return;
1319         }
1320
1321         for (i=0; i < info->num_blobs; i++) {
1322                 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1323                         unix_username = (const char *)info->blobs[i].blob.data;
1324                         break;
1325                 }
1326         }
1327
1328         if (!unix_username || !unix_username[0]) {
1329                 return;
1330         }
1331
1332         *user_ret = strdup(unix_username);
1333 }
1334
1335 /**
1336  * Set string into the PAM stack.
1337  *
1338  * @param ctx PAM winbind context.
1339  * @param data_name Key name for pam_set_data.
1340  * @param value String value.
1341  *
1342  * @return void.
1343  */
1344
1345 static void _pam_set_data_string(struct pwb_context *ctx,
1346                                  const char *data_name,
1347                                  const char *value)
1348 {
1349         int ret;
1350
1351         if (!data_name || !value || (strlen(data_name) == 0) ||
1352              (strlen(value) == 0)) {
1353                 return;
1354         }
1355
1356         ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1357                            _pam_winbind_cleanup_func);
1358         if (ret != PAM_SUCCESS) {
1359                 _pam_log_debug(ctx, LOG_DEBUG,
1360                                "Could not set data %s: %s\n",
1361                                data_name, pam_strerror(ctx->pamh, ret));
1362         }
1363 }
1364
1365 /**
1366  * Set info3 strings into the PAM stack.
1367  *
1368  * @param ctx PAM winbind context.
1369  * @param data_name Key name for pam_set_data.
1370  * @param value String value.
1371  *
1372  * @return void.
1373  */
1374
1375 static void _pam_set_data_info3(struct pwb_context *ctx,
1376                                 const struct wbcAuthUserInfo *info)
1377 {
1378         _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1379                              info->home_directory);
1380         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1381                              info->logon_script);
1382         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1383                              info->logon_server);
1384         _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1385                              info->profile_path);
1386 }
1387
1388 /**
1389  * Free info3 strings in the PAM stack.
1390  *
1391  * @param pamh PAM handle
1392  *
1393  * @return void.
1394  */
1395
1396 static void _pam_free_data_info3(pam_handle_t *pamh)
1397 {
1398         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1399         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1400         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1401         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1402 }
1403
1404 /**
1405  * Send PAM_ERROR_MSG for cached or grace logons.
1406  *
1407  * @param ctx PAM winbind context.
1408  * @param username User in PAM request.
1409  * @param info3_user_flgs Info3 flags containing logon type bits.
1410  *
1411  * @return void.
1412  */
1413
1414 static void _pam_warn_logon_type(struct pwb_context *ctx,
1415                                  const char *username,
1416                                  uint32_t info3_user_flgs)
1417 {
1418         /* inform about logon type */
1419         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1420
1421                 _make_remark(ctx, PAM_ERROR_MSG,
1422                              _("Grace login. "
1423                                "Please change your password as soon you're "
1424                                "online again"));
1425                 _pam_log_debug(ctx, LOG_DEBUG,
1426                                "User %s logged on using grace logon\n",
1427                                username);
1428
1429         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1430
1431                 _make_remark(ctx, PAM_ERROR_MSG,
1432                              _("Domain Controller unreachable, "
1433                                "using cached credentials instead. "
1434                                "Network resources may be unavailable"));
1435                 _pam_log_debug(ctx, LOG_DEBUG,
1436                                "User %s logged on using cached credentials\n",
1437                                username);
1438         }
1439 }
1440
1441 /**
1442  * Send PAM_ERROR_MSG for krb5 errors.
1443  *
1444  * @param ctx PAM winbind context.
1445  * @param username User in PAM request.
1446  * @param info3_user_flgs Info3 flags containing logon type bits.
1447  *
1448  * @return void.
1449  */
1450
1451 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1452                                    const char *username,
1453                                    uint32_t info3_user_flgs)
1454 {
1455         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1456                 _make_remark(ctx, PAM_ERROR_MSG,
1457                              _("Failed to establish your Kerberos Ticket cache "
1458                                "due time differences\n"
1459                                "with the domain controller.  "
1460                                "Please verify the system time.\n"));
1461                 _pam_log_debug(ctx, LOG_DEBUG,
1462                                "User %s: Clock skew when getting Krb5 TGT\n",
1463                                username);
1464         }
1465 }
1466
1467 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1468                                        const struct wbcAuthErrorInfo *e,
1469                                        const char *nt_status_string,
1470                                        int *pam_err)
1471 {
1472         const char *ntstatus = NULL;
1473         const char *error_string = NULL;
1474
1475         if (!e || !pam_err) {
1476                 return false;
1477         }
1478
1479         ntstatus = e->nt_string;
1480         if (!ntstatus) {
1481                 return false;
1482         }
1483
1484         if (strcasecmp(ntstatus, nt_status_string) == 0) {
1485
1486                 error_string = _get_ntstatus_error_string(nt_status_string);
1487                 if (error_string) {
1488                         _make_remark(ctx, PAM_ERROR_MSG, error_string);
1489                         *pam_err = e->pam_error;
1490                         return true;
1491                 }
1492
1493                 if (e->display_string) {
1494                         _make_remark(ctx, PAM_ERROR_MSG, _(e->display_string));
1495                         *pam_err = e->pam_error;
1496                         return true;
1497                 }
1498
1499                 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1500                 *pam_err = e->pam_error;
1501
1502                 return true;
1503         }
1504
1505         return false;
1506 };
1507
1508 /**
1509  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1510  *
1511  * @param i The wbcUserPasswordPolicyInfo struct.
1512  *
1513  * @return string (caller needs to talloc_free).
1514  */
1515
1516 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1517                                                  struct wbcUserPasswordPolicyInfo *i)
1518 {
1519         char *str = NULL;
1520
1521         if (!i) {
1522                 goto failed;
1523         }
1524
1525         str = talloc_asprintf(ctx, _("Your password "));
1526         if (!str) {
1527                 goto failed;
1528         }
1529
1530         if (i->min_length_password > 0) {
1531                 str = talloc_asprintf_append(str,
1532                                _("must be at least %d characters; "),
1533                                i->min_length_password);
1534                 if (!str) {
1535                         goto failed;
1536                 }
1537         }
1538
1539         if (i->password_history > 0) {
1540                 str = talloc_asprintf_append(str,
1541                                _("cannot repeat any of your previous %d "
1542                                 "passwords; "),
1543                                i->password_history);
1544                 if (!str) {
1545                         goto failed;
1546                 }
1547         }
1548
1549         if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1550                 str = talloc_asprintf_append(str,
1551                                _("must contain capitals, numerals "
1552                                  "or punctuation; "
1553                                  "and cannot contain your account "
1554                                  "or full name; "));
1555                 if (!str) {
1556                         goto failed;
1557                 }
1558         }
1559
1560         str = talloc_asprintf_append(str,
1561                        _("Please type a different password. "
1562                          "Type a password which meets these requirements in "
1563                          "both text boxes."));
1564         if (!str) {
1565                 goto failed;
1566         }
1567
1568         return str;
1569
1570  failed:
1571         TALLOC_FREE(str);
1572         return NULL;
1573 }
1574
1575 static int _pam_create_homedir(struct pwb_context *ctx,
1576                                const char *dirname,
1577                                mode_t mode)
1578 {
1579         struct stat sbuf;
1580
1581         if (stat(dirname, &sbuf) == 0) {
1582                 return PAM_SUCCESS;
1583         }
1584
1585         if (mkdir(dirname, mode) != 0) {
1586
1587                 _make_remark_format(ctx, PAM_TEXT_INFO,
1588                                     _("Creating directory: %s failed: %s"),
1589                                     dirname, strerror(errno));
1590                 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1591                  dirname, strerror(errno));
1592                  return PAM_PERM_DENIED;
1593         }
1594
1595         return PAM_SUCCESS;
1596 }
1597
1598 static int _pam_chown_homedir(struct pwb_context *ctx,
1599                               const char *dirname,
1600                               uid_t uid,
1601                               gid_t gid)
1602 {
1603         if (chown(dirname, uid, gid) != 0) {
1604                 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1605                          dirname, strerror(errno));
1606                 return PAM_PERM_DENIED;
1607         }
1608
1609         return PAM_SUCCESS;
1610 }
1611
1612 static int _pam_mkhomedir(struct pwb_context *ctx)
1613 {
1614         struct passwd *pwd = NULL;
1615         char *token = NULL;
1616         char *create_dir = NULL;
1617         char *user_dir = NULL;
1618         int ret;
1619         const char *username;
1620         mode_t mode = 0700;
1621         char *safe_ptr = NULL;
1622         char *p = NULL;
1623
1624         /* Get the username */
1625         ret = pam_get_user(ctx->pamh, &username, NULL);
1626         if ((ret != PAM_SUCCESS) || (!username)) {
1627                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1628                 return PAM_SERVICE_ERR;
1629         }
1630
1631         pwd = getpwnam(username);
1632         if (pwd == NULL) {
1633                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1634                 return PAM_USER_UNKNOWN;
1635         }
1636         _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1637
1638         ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1639         if (ret == PAM_SUCCESS) {
1640                 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1641                                          pwd->pw_uid,
1642                                          pwd->pw_gid);
1643         }
1644
1645         if (ret == PAM_SUCCESS) {
1646                 return ret;
1647         }
1648
1649         /* maybe we need to create parent dirs */
1650         create_dir = talloc_strdup(ctx, "/");
1651         if (!create_dir) {
1652                 return PAM_BUF_ERR;
1653         }
1654
1655         /* find final directory */
1656         user_dir = strrchr(pwd->pw_dir, '/');
1657         if (!user_dir) {
1658                 return PAM_BUF_ERR;
1659         }
1660         user_dir++;
1661
1662         _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1663
1664         p = pwd->pw_dir;
1665
1666         while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1667
1668                 mode = 0755;
1669
1670                 p = NULL;
1671
1672                 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1673
1674                 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1675                 if (!create_dir) {
1676                         return PAM_BUF_ERR;
1677                 }
1678                 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1679
1680                 if (strcmp(token, user_dir) == 0) {
1681                         _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1682                         mode = 0700;
1683                 }
1684
1685                 ret = _pam_create_homedir(ctx, create_dir, mode);
1686                 if (ret != PAM_SUCCESS) {
1687                         return ret;
1688                 }
1689         }
1690
1691         return _pam_chown_homedir(ctx, create_dir,
1692                                   pwd->pw_uid,
1693                                   pwd->pw_gid);
1694 }
1695
1696 /* talk to winbindd */
1697 static int winbind_auth_request(struct pwb_context *ctx,
1698                                 const char *user,
1699                                 const char *pass,
1700                                 const char *member,
1701                                 const char *cctype,
1702                                 const int warn_pwd_expire,
1703                                 struct wbcAuthErrorInfo **p_error,
1704                                 struct wbcLogonUserInfo **p_info,
1705                                 time_t *pwd_last_set,
1706                                 char **user_ret)
1707 {
1708         wbcErr wbc_status;
1709         struct wbcLogonUserParams logon;
1710         char membership_of[1024];
1711         uid_t user_uid = -1;
1712         uint32_t flags = WBFLAG_PAM_INFO3_TEXT;
1713         struct wbcLogonUserInfo *info = NULL;
1714         struct wbcAuthUserInfo *user_info = NULL;
1715         struct wbcAuthErrorInfo *error = NULL;
1716         int ret = PAM_AUTH_ERR;
1717         int i;
1718         const char *codes[] = {
1719                 "NT_STATUS_PASSWORD_EXPIRED",
1720                 "NT_STATUS_PASSWORD_MUST_CHANGE",
1721                 "NT_STATUS_INVALID_WORKSTATION",
1722                 "NT_STATUS_INVALID_LOGON_HOURS",
1723                 "NT_STATUS_ACCOUNT_EXPIRED",
1724                 "NT_STATUS_ACCOUNT_DISABLED",
1725                 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1726                 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1727                 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1728                 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1729                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1730                 "NT_STATUS_NO_LOGON_SERVERS",
1731                 "NT_STATUS_WRONG_PASSWORD",
1732                 "NT_STATUS_ACCESS_DENIED"
1733         };
1734
1735         if (pwd_last_set) {
1736                 *pwd_last_set = 0;
1737         }
1738
1739         /* Krb5 auth always has to go against the KDC of the user's realm */
1740
1741         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1742                 flags           |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1743         }
1744
1745         if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1746                 struct passwd *pwd = NULL;
1747
1748                 pwd = getpwnam(user);
1749                 if (pwd == NULL) {
1750                         return PAM_USER_UNKNOWN;
1751                 }
1752                 user_uid        = pwd->pw_uid;
1753         }
1754
1755         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1756
1757                 _pam_log_debug(ctx, LOG_DEBUG,
1758                                "enabling krb5 login flag\n");
1759
1760                 flags           |= WBFLAG_PAM_KRB5 |
1761                                    WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1762         }
1763
1764         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1765                 _pam_log_debug(ctx, LOG_DEBUG,
1766                                "enabling cached login flag\n");
1767                 flags           |= WBFLAG_PAM_CACHED_LOGIN;
1768         }
1769
1770         if (user_ret) {
1771                 *user_ret = NULL;
1772                 flags           |= WBFLAG_PAM_UNIX_NAME;
1773         }
1774
1775         if (cctype != NULL) {
1776                 _pam_log_debug(ctx, LOG_DEBUG,
1777                                "enabling request for a %s krb5 ccache\n",
1778                                cctype);
1779         }
1780
1781         if (member != NULL) {
1782
1783                 ZERO_STRUCT(membership_of);
1784
1785                 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1786                                                           membership_of,
1787                                                           sizeof(membership_of))) {
1788                         _pam_log_debug(ctx, LOG_ERR,
1789                                        "failed to serialize membership of sid "
1790                                        "\"%s\"\n", member);
1791                         return PAM_AUTH_ERR;
1792                 }
1793         }
1794
1795         ZERO_STRUCT(logon);
1796
1797         logon.username                  = user;
1798         logon.password                  = pass;
1799
1800         if (cctype) {
1801                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1802                                              &logon.blobs,
1803                                              "krb5_cc_type",
1804                                              0,
1805                                              discard_const_p(uint8_t, cctype),
1806                                              strlen(cctype)+1);
1807                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1808                         goto done;
1809                 }
1810         }
1811
1812         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1813                                      &logon.blobs,
1814                                      "flags",
1815                                      0,
1816                                      (uint8_t *)&flags,
1817                                      sizeof(flags));
1818         if (!WBC_ERROR_IS_OK(wbc_status)) {
1819                 goto done;
1820         }
1821
1822         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1823                                      &logon.blobs,
1824                                      "user_uid",
1825                                      0,
1826                                      (uint8_t *)&user_uid,
1827                                      sizeof(user_uid));
1828         if (!WBC_ERROR_IS_OK(wbc_status)) {
1829                 goto done;
1830         }
1831
1832         if (member) {
1833                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1834                                              &logon.blobs,
1835                                              "membership_of",
1836                                              0,
1837                                              (uint8_t *)membership_of,
1838                                              sizeof(membership_of));
1839                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1840                         goto done;
1841                 }
1842         }
1843
1844         wbc_status = wbcCtxLogonUser(ctx->wbc_ctx,
1845                                      &logon,
1846                                      &info,
1847                                      &error,
1848                                      NULL);
1849         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1850                                           user, "wbcLogonUser");
1851         wbcFreeMemory(logon.blobs);
1852         logon.blobs = NULL;
1853
1854         if (info && info->info) {
1855                 user_info = info->info;
1856         }
1857
1858         if (pwd_last_set && user_info) {
1859                 *pwd_last_set = user_info->pass_last_set_time;
1860         }
1861
1862         if (p_info && info) {
1863                 *p_info = info;
1864         }
1865
1866         if (p_error && error) {
1867                 /* We want to process the error in the caller. */
1868                 *p_error = error;
1869                 return ret;
1870         }
1871
1872         for (i=0; i<ARRAY_SIZE(codes); i++) {
1873                 int _ret = ret;
1874                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1875                         ret = _ret;
1876                         goto done;
1877                 }
1878         }
1879
1880         if ((ret == PAM_SUCCESS) && user_info && info) {
1881
1882                 bool already_expired = false;
1883                 bool change_pwd = false;
1884
1885                 /* warn a user if the password is about to expire soon */
1886                 _pam_warn_password_expiry(ctx, user_info,
1887                                           warn_pwd_expire,
1888                                           &already_expired,
1889                                           &change_pwd);
1890
1891                 if (already_expired == true) {
1892
1893                         SMB_TIME_T last_set = user_info->pass_last_set_time;
1894                         SMB_TIME_T must_set = user_info->pass_must_change_time;
1895
1896                         _pam_log_debug(ctx, LOG_DEBUG,
1897                                        "Password has expired "
1898                                        "(Password was last set: %lld, "
1899                                        "it must be changed here "
1900                                        "%lld (now it's: %ld))\n",
1901                                        (long long int)last_set,
1902                                        (long long int)must_set,
1903                                        (long)time(NULL));
1904
1905                         return PAM_AUTHTOK_EXPIRED;
1906                 }
1907
1908                 if (change_pwd) {
1909                         ret = PAM_NEW_AUTHTOK_REQD;
1910                         goto done;
1911                 }
1912
1913                 /* inform about logon type */
1914                 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1915
1916                 /* inform about krb5 failures */
1917                 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1918
1919                 /* set some info3 info for other modules in the stack */
1920                 _pam_set_data_info3(ctx, user_info);
1921
1922                 /* put krb5ccname into env */
1923                 _pam_setup_krb5_env(ctx, info);
1924
1925                 /* If winbindd returned a username, return the pointer to it
1926                  * here. */
1927                 _pam_setup_unix_username(ctx, user_ret, info);
1928         }
1929
1930  done:
1931         wbcFreeMemory(logon.blobs);
1932         if (info && info->blobs && !p_info) {
1933                 wbcFreeMemory(info->blobs);
1934         }
1935         if (error && !p_error) {
1936                 wbcFreeMemory(error);
1937         }
1938         if (info && !p_info) {
1939                 wbcFreeMemory(info);
1940         }
1941
1942         return ret;
1943 }
1944
1945 /* talk to winbindd */
1946 static int winbind_chauthtok_request(struct pwb_context *ctx,
1947                                      const char *user,
1948                                      const char *oldpass,
1949                                      const char *newpass,
1950                                      time_t pwd_last_set)
1951 {
1952         wbcErr wbc_status;
1953         struct wbcChangePasswordParams params;
1954         struct wbcAuthErrorInfo *error = NULL;
1955         struct wbcUserPasswordPolicyInfo *policy = NULL;
1956         enum wbcPasswordChangeRejectReason reject_reason = -1;
1957         uint32_t flags = 0;
1958
1959         int i;
1960         const char *codes[] = {
1961                 "NT_STATUS_BACKUP_CONTROLLER",
1962                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1963                 "NT_STATUS_NO_LOGON_SERVERS",
1964                 "NT_STATUS_ACCESS_DENIED",
1965                 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1966                 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1967                 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1968         };
1969         int ret = PAM_AUTH_ERR;
1970
1971         ZERO_STRUCT(params);
1972
1973         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1974                 flags |= WBFLAG_PAM_KRB5 |
1975                          WBFLAG_PAM_CONTACT_TRUSTDOM;
1976         }
1977
1978         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1979                 flags |= WBFLAG_PAM_CACHED_LOGIN;
1980         }
1981
1982         params.account_name             = user;
1983         params.level                    = WBC_CHANGE_PASSWORD_LEVEL_PLAIN;
1984         params.old_password.plaintext   = oldpass;
1985         params.new_password.plaintext   = newpass;
1986         params.flags                    = flags;
1987
1988         wbc_status = wbcCtxChangeUserPasswordEx(ctx->wbc_ctx,
1989                                                 &params,
1990                                                 &error,
1991                                                 &reject_reason,
1992                                                 &policy);
1993         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1994                                           user, "wbcChangeUserPasswordEx");
1995
1996         if (WBC_ERROR_IS_OK(wbc_status)) {
1997                 _pam_log(ctx, LOG_NOTICE,
1998                          "user '%s' password changed", user);
1999                 return PAM_SUCCESS;
2000         }
2001
2002         if (!error) {
2003                 wbcFreeMemory(policy);
2004                 return ret;
2005         }
2006
2007         for (i=0; i<ARRAY_SIZE(codes); i++) {
2008                 int _ret = ret;
2009                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
2010                         ret = _ret;
2011                         goto done;
2012                 }
2013         }
2014
2015         if (!strcasecmp(error->nt_string,
2016                         "NT_STATUS_PASSWORD_RESTRICTION")) {
2017
2018                 char *pwd_restriction_string = NULL;
2019                 SMB_TIME_T min_pwd_age = 0;
2020
2021                 if (policy) {
2022                         min_pwd_age     = policy->min_passwordage;
2023                 }
2024
2025                 /* FIXME: avoid to send multiple PAM messages after another */
2026                 switch ((int)reject_reason) {
2027                         case -1:
2028                                 break;
2029                         case WBC_PWD_CHANGE_NO_ERROR:
2030                                 if ((min_pwd_age > 0) &&
2031                                     (pwd_last_set + min_pwd_age > time(NULL))) {
2032                                         PAM_WB_REMARK_DIRECT(ctx,
2033                                              "NT_STATUS_PWD_TOO_RECENT");
2034                                 }
2035                                 break;
2036                         case WBC_PWD_CHANGE_PASSWORD_TOO_SHORT:
2037                                 PAM_WB_REMARK_DIRECT(ctx,
2038                                         "NT_STATUS_PWD_TOO_SHORT");
2039                                 break;
2040                         case WBC_PWD_CHANGE_PWD_IN_HISTORY:
2041                                 PAM_WB_REMARK_DIRECT(ctx,
2042                                         "NT_STATUS_PWD_HISTORY_CONFLICT");
2043                                 break;
2044                         case WBC_PWD_CHANGE_NOT_COMPLEX:
2045                                 _make_remark(ctx, PAM_ERROR_MSG,
2046                                              _("Password does not meet "
2047                                                "complexity requirements"));
2048                                 break;
2049                         default:
2050                                 _pam_log_debug(ctx, LOG_DEBUG,
2051                                                "unknown password change "
2052                                                "reject reason: %d",
2053                                                reject_reason);
2054                                 break;
2055                 }
2056
2057                 pwd_restriction_string =
2058                         _pam_compose_pwd_restriction_string(ctx, policy);
2059                 if (pwd_restriction_string) {
2060                         _make_remark(ctx, PAM_ERROR_MSG,
2061                                      pwd_restriction_string);
2062                         TALLOC_FREE(pwd_restriction_string);
2063                 }
2064         }
2065  done:
2066         wbcFreeMemory(error);
2067         wbcFreeMemory(policy);
2068
2069         return ret;
2070 }
2071
2072 /*
2073  * Checks if a user has an account
2074  *
2075  * return values:
2076  *       1  = User not found
2077  *       0  = OK
2078  *      -1  = System error
2079  */
2080 static int valid_user(struct pwb_context *ctx,
2081                       const char *user)
2082 {
2083         /* check not only if the user is available over NSS calls, also make
2084          * sure it's really a winbind user, this is important when stacking PAM
2085          * modules in the 'account' or 'password' facility. */
2086
2087         wbcErr wbc_status;
2088         struct passwd *pwd = NULL;
2089         struct passwd *wb_pwd = NULL;
2090
2091         pwd = getpwnam(user);
2092         if (pwd == NULL) {
2093                 return 1;
2094         }
2095
2096         wbc_status = wbcCtxGetpwnam(ctx->wbc_ctx, user, &wb_pwd);
2097         wbcFreeMemory(wb_pwd);
2098         if (!WBC_ERROR_IS_OK(wbc_status)) {
2099                 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
2100                         wbcErrorString(wbc_status));
2101         }
2102
2103         switch (wbc_status) {
2104                 case WBC_ERR_UNKNOWN_USER:
2105                 /* match other insane libwbclient return codes */
2106                 case WBC_ERR_WINBIND_NOT_AVAILABLE:
2107                 case WBC_ERR_DOMAIN_NOT_FOUND:
2108                         return 1;
2109                 case WBC_ERR_SUCCESS:
2110                         return 0;
2111                 default:
2112                         break;
2113         }
2114         return -1;
2115 }
2116
2117 static char *_pam_delete(register char *xx)
2118 {
2119         _pam_overwrite(xx);
2120         _pam_drop(xx);
2121         return NULL;
2122 }
2123
2124 /*
2125  * obtain a password from the user
2126  */
2127
2128 static int _winbind_read_password(struct pwb_context *ctx,
2129                                   unsigned int ctrl,
2130                                   const char *comment,
2131                                   const char *prompt1,
2132                                   const char *prompt2,
2133                                   const char **pass)
2134 {
2135         int authtok_flag;
2136         int retval;
2137         const char *item;
2138         char *token;
2139
2140         _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2141
2142         /*
2143          * make sure nothing inappropriate gets returned
2144          */
2145
2146         *pass = token = NULL;
2147
2148         /*
2149          * which authentication token are we getting?
2150          */
2151
2152         if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2153                 authtok_flag = PAM_OLDAUTHTOK;
2154         } else {
2155                 authtok_flag = PAM_AUTHTOK;
2156         }
2157
2158         /*
2159          * should we obtain the password from a PAM item ?
2160          */
2161
2162         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2163             on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2164                 retval = pam_get_item(ctx->pamh,
2165                                       authtok_flag,
2166                                       (const void **) &item);
2167                 if (retval != PAM_SUCCESS) {
2168                         /* very strange. */
2169                         _pam_log(ctx, LOG_ALERT,
2170                                  "pam_get_item returned error "
2171                                  "to unix-read-password");
2172                         return retval;
2173                 } else if (item != NULL) {      /* we have a password! */
2174                         *pass = item;
2175                         item = NULL;
2176                         _pam_log(ctx, LOG_DEBUG,
2177                                  "pam_get_item returned a password");
2178                         return PAM_SUCCESS;
2179                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2180                         return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2181                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2182                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
2183                         return PAM_AUTHTOK_RECOVER_ERR;
2184                 }
2185         }
2186         /*
2187          * getting here implies we will have to get the password from the
2188          * user directly.
2189          */
2190
2191         {
2192                 struct pam_message msg[3];
2193                 const struct pam_message *pmsg[3];
2194                 struct pam_response *resp;
2195                 int i, replies;
2196
2197                 /* prepare to converse */
2198
2199                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2200                         pmsg[0] = &msg[0];
2201                         msg[0].msg_style = PAM_TEXT_INFO;
2202                         msg[0].msg = discard_const_p(char, comment);
2203                         i = 1;
2204                 } else {
2205                         i = 0;
2206                 }
2207
2208                 pmsg[i] = &msg[i];
2209                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2210                 msg[i++].msg = discard_const_p(char, prompt1);
2211                 replies = 1;
2212
2213                 if (prompt2 != NULL) {
2214                         pmsg[i] = &msg[i];
2215                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2216                         msg[i++].msg = discard_const_p(char, prompt2);
2217                         ++replies;
2218                 }
2219                 /* so call the conversation expecting i responses */
2220                 resp = NULL;
2221                 retval = converse(ctx->pamh, i, pmsg, &resp);
2222                 if (resp == NULL) {
2223                         if (retval == PAM_SUCCESS) {
2224                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2225                         }
2226                         goto done;
2227                 }
2228                 if (retval != PAM_SUCCESS) {
2229                         _pam_drop_reply(resp, i);
2230                         goto done;
2231                 }
2232
2233                 /* interpret the response */
2234
2235                 token = x_strdup(resp[i - replies].resp);
2236                 if (!token) {
2237                         _pam_log(ctx, LOG_NOTICE,
2238                                  "could not recover "
2239                                  "authentication token");
2240                         retval = PAM_AUTHTOK_RECOVER_ERR;
2241                         goto done;
2242                 }
2243
2244                 if (replies == 2) {
2245                         /* verify that password entered correctly */
2246                         if (!resp[i - 1].resp ||
2247                             strcmp(token, resp[i - 1].resp)) {
2248                                 _pam_delete(token);     /* mistyped */
2249                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2250                                 _make_remark(ctx, PAM_ERROR_MSG,
2251                                              MISTYPED_PASS);
2252                         }
2253                 }
2254
2255                 /*
2256                  * tidy up the conversation (resp_retcode) is ignored
2257                  * -- what is it for anyway? AGM
2258                  */
2259                 _pam_drop_reply(resp, i);
2260         }
2261
2262  done:
2263         if (retval != PAM_SUCCESS) {
2264                 _pam_log_debug(ctx, LOG_DEBUG,
2265                                "unable to obtain a password");
2266                 return retval;
2267         }
2268         /* 'token' is the entered password */
2269
2270         /* we store this password as an item */
2271
2272         retval = pam_set_item(ctx->pamh, authtok_flag, token);
2273         _pam_delete(token);     /* clean it up */
2274         if (retval != PAM_SUCCESS ||
2275             (retval = pam_get_item(ctx->pamh, authtok_flag, (const void **) &item)) != PAM_SUCCESS) {
2276
2277                 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2278                 return retval;
2279
2280         }
2281
2282         *pass = item;
2283         item = NULL;            /* break link to password */
2284
2285         return PAM_SUCCESS;
2286 }
2287
2288 static const char *get_conf_item_string(struct pwb_context *ctx,
2289                                         const char *item,
2290                                         int config_flag)
2291 {
2292         int i = 0;
2293         const char *parm_opt = NULL;
2294
2295         if (!(ctx->ctrl & config_flag)) {
2296                 goto out;
2297         }
2298
2299         /* let the pam opt take precedence over the pam_winbind.conf option */
2300         for (i=0; i<ctx->argc; i++) {
2301
2302                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2303                         char *p;
2304
2305                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2306                                 _pam_log(ctx, LOG_INFO,
2307                                          "no \"=\" delimiter for \"%s\" found\n",
2308                                          item);
2309                                 goto out;
2310                         }
2311                         _pam_log_debug(ctx, LOG_INFO,
2312                                        "PAM config: %s '%s'\n", item, p+1);
2313                         return p + 1;
2314                 }
2315         }
2316
2317         if (ctx->dict) {
2318                 char *key = NULL;
2319
2320                 key = talloc_asprintf(ctx, "global:%s", item);
2321                 if (!key) {
2322                         goto out;
2323                 }
2324
2325                 parm_opt = tiniparser_getstring_nonempty(ctx->dict, key, NULL);
2326                 TALLOC_FREE(key);
2327
2328                 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2329                                item, parm_opt);
2330         }
2331 out:
2332         return parm_opt;
2333 }
2334
2335 static int get_config_item_int(struct pwb_context *ctx,
2336                                const char *item,
2337                                int config_flag)
2338 {
2339         int i, parm_opt = -1;
2340
2341         if (!(ctx->ctrl & config_flag)) {
2342                 goto out;
2343         }
2344
2345         /* let the pam opt take precedence over the pam_winbind.conf option */
2346         for (i = 0; i < ctx->argc; i++) {
2347
2348                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2349                         char *p;
2350
2351                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2352                                 _pam_log(ctx, LOG_INFO,
2353                                          "no \"=\" delimiter for \"%s\" found\n",
2354                                          item);
2355                                 goto out;
2356                         }
2357                         parm_opt = atoi(p + 1);
2358                         _pam_log_debug(ctx, LOG_INFO,
2359                                        "PAM config: %s '%d'\n",
2360                                        item, parm_opt);
2361                         return parm_opt;
2362                 }
2363         }
2364
2365         if (ctx->dict) {
2366                 char *key = NULL;
2367
2368                 key = talloc_asprintf(ctx, "global:%s", item);
2369                 if (!key) {
2370                         goto out;
2371                 }
2372
2373                 parm_opt = tiniparser_getint(ctx->dict, key, -1);
2374                 TALLOC_FREE(key);
2375
2376                 _pam_log_debug(ctx, LOG_INFO,
2377                                "CONFIG file: %s '%d'\n",
2378                                item, parm_opt);
2379         }
2380 out:
2381         return parm_opt;
2382 }
2383
2384 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2385 {
2386         return get_conf_item_string(ctx, "krb5_ccache_type",
2387                                     WINBIND_KRB5_CCACHE_TYPE);
2388 }
2389
2390 static const char *get_member_from_config(struct pwb_context *ctx)
2391 {
2392         const char *ret = NULL;
2393         ret = get_conf_item_string(ctx, "require_membership_of",
2394                                    WINBIND_REQUIRED_MEMBERSHIP);
2395         if (ret != NULL) {
2396                 return ret;
2397         }
2398         return get_conf_item_string(ctx, "require-membership-of",
2399                                     WINBIND_REQUIRED_MEMBERSHIP);
2400 }
2401
2402 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2403 {
2404         int ret;
2405         ret = get_config_item_int(ctx, "warn_pwd_expire",
2406                                   WINBIND_WARN_PWD_EXPIRE);
2407         /* no or broken setting */
2408         if (ret < 0) {
2409                 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2410         }
2411         return ret;
2412 }
2413
2414 /**
2415  * Retrieve the winbind separator.
2416  *
2417  * @param ctx PAM winbind context.
2418  *
2419  * @return string separator character. NULL on failure.
2420  */
2421
2422 static char winbind_get_separator(struct pwb_context *ctx)
2423 {
2424         wbcErr wbc_status;
2425         static struct wbcInterfaceDetails *details = NULL;
2426
2427         wbc_status = wbcCtxInterfaceDetails(ctx->wbc_ctx, &details);
2428         if (!WBC_ERROR_IS_OK(wbc_status)) {
2429                 _pam_log(ctx, LOG_ERR,
2430                          "Could not retrieve winbind interface details: %s",
2431                          wbcErrorString(wbc_status));
2432                 return '\0';
2433         }
2434
2435         if (!details) {
2436                 return '\0';
2437         }
2438
2439         return details->winbind_separator;
2440 }
2441
2442
2443 /**
2444  * Convert a upn to a name.
2445  *
2446  * @param ctx PAM winbind context.
2447  * @param upn  User UPN to be translated.
2448  *
2449  * @return converted name. NULL pointer on failure. Caller needs to free.
2450  */
2451
2452 static char* winbind_upn_to_username(struct pwb_context *ctx,
2453                                      const char *upn)
2454 {
2455         char sep;
2456         wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2457         struct wbcDomainSid sid;
2458         enum wbcSidType type;
2459         char *domain = NULL;
2460         char *name;
2461         char *p;
2462         char *result;
2463
2464         /* This cannot work when the winbind separator = @ */
2465
2466         sep = winbind_get_separator(ctx);
2467         if (!sep || sep == '@') {
2468                 return NULL;
2469         }
2470
2471         name = talloc_strdup(ctx, upn);
2472         if (!name) {
2473                 return NULL;
2474         }
2475
2476         p = strchr(name, '@');
2477         if (p == NULL) {
2478                 TALLOC_FREE(name);
2479                 return NULL;
2480         }
2481         *p = '\0';
2482         domain = p + 1;
2483
2484         /* Convert the UPN to a SID */
2485
2486         wbc_status = wbcCtxLookupName(ctx->wbc_ctx, domain, name, &sid, &type);
2487         if (!WBC_ERROR_IS_OK(wbc_status)) {
2488                 return NULL;
2489         }
2490
2491         /* Convert the the SID back to the sAMAccountName */
2492
2493         wbc_status = wbcCtxLookupSid(ctx->wbc_ctx, &sid, &domain, &name, &type);
2494         if (!WBC_ERROR_IS_OK(wbc_status)) {
2495                 return NULL;
2496         }
2497
2498         result = talloc_asprintf(ctx, "%s%c%s", domain, sep, name);
2499         wbcFreeMemory(domain);
2500         wbcFreeMemory(name);
2501         return result;
2502 }
2503
2504 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2505                             int argc, enum pam_winbind_request_type type,
2506                             const char **argv)
2507 {
2508         int retval = PAM_SUCCESS;
2509         struct pwb_context *ctx = NULL;
2510         struct wbcLogoffUserParams logoff;
2511         struct wbcAuthErrorInfo *error = NULL;
2512         const char *user;
2513         wbcErr wbc_status = WBC_ERR_SUCCESS;
2514
2515         ZERO_STRUCT(logoff);
2516
2517         retval = _pam_winbind_init_context(pamh, flags, argc, argv, type, &ctx);
2518         if (retval != PAM_SUCCESS) {
2519                 return retval;
2520         }
2521
2522         _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2523
2524         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2525
2526                 /* destroy the ccache here */
2527
2528                 uint32_t wbc_flags = 0;
2529                 const char *ccname = NULL;
2530                 struct passwd *pwd = NULL;
2531
2532                 retval = pam_get_user(pamh, &user, _("Username: "));
2533                 if (retval != PAM_SUCCESS) {
2534                         _pam_log(ctx, LOG_ERR,
2535                                  "could not identify user");
2536                         goto out;
2537                 }
2538
2539                 if (user == NULL) {
2540                         _pam_log(ctx, LOG_ERR,
2541                                  "username was NULL!");
2542                         retval = PAM_USER_UNKNOWN;
2543                         goto out;
2544                 }
2545
2546                 _pam_log_debug(ctx, LOG_DEBUG,
2547                                "username [%s] obtained", user);
2548
2549                 ccname = pam_getenv(pamh, "KRB5CCNAME");
2550                 if (ccname == NULL) {
2551                         _pam_log_debug(ctx, LOG_DEBUG,
2552                                        "user has no KRB5CCNAME environment");
2553                 }
2554
2555                 pwd = getpwnam(user);
2556                 if (pwd == NULL) {
2557                         retval = PAM_USER_UNKNOWN;
2558                         goto out;
2559                 }
2560
2561                 wbc_flags = WBFLAG_PAM_KRB5 |
2562                         WBFLAG_PAM_CONTACT_TRUSTDOM;
2563
2564                 logoff.username         = user;
2565
2566                 if (ccname) {
2567                         wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2568                                                      &logoff.blobs,
2569                                                      "ccfilename",
2570                                                      0,
2571                                                      discard_const_p(uint8_t, ccname),
2572                                                      strlen(ccname)+1);
2573                         if (!WBC_ERROR_IS_OK(wbc_status)) {
2574                                 goto out;
2575                         }
2576                 }
2577
2578                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2579                                              &logoff.blobs,
2580                                              "flags",
2581                                              0,
2582                                              (uint8_t *)&wbc_flags,
2583                                              sizeof(wbc_flags));
2584                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2585                         goto out;
2586                 }
2587
2588                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2589                                              &logoff.blobs,
2590                                              "user_uid",
2591                                              0,
2592                                              (uint8_t *)&pwd->pw_uid,
2593                                              sizeof(pwd->pw_uid));
2594                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2595                         goto out;
2596                 }
2597
2598                 wbc_status = wbcCtxLogoffUserEx(ctx->wbc_ctx, &logoff, &error);
2599                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2600                                                      user, "wbcLogoffUser");
2601                 wbcFreeMemory(error);
2602                 wbcFreeMemory(logoff.blobs);
2603                 logoff.blobs = NULL;
2604
2605                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2606                         _pam_log(ctx, LOG_INFO,
2607                                  "failed to logoff user %s: %s\n",
2608                                          user, wbcErrorString(wbc_status));
2609                 }
2610         }
2611
2612 out:
2613         if (logoff.blobs) {
2614                 wbcFreeMemory(logoff.blobs);
2615         }
2616
2617         if (!WBC_ERROR_IS_OK(wbc_status)) {
2618                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2619                      user, "wbcLogoffUser");
2620         }
2621
2622         /*
2623          * Delete the krb5 ccname variable from the PAM environment
2624          * if it was set by winbind.
2625          */
2626         if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2627                 pam_putenv(pamh, "KRB5CCNAME");
2628         }
2629
2630         _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2631
2632         TALLOC_FREE(ctx);
2633
2634         return retval;
2635 }
2636
2637 PAM_EXTERN
2638 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2639                         int argc, const char **argv)
2640 {
2641         const char *username;
2642         const char *password;
2643         const char *member = NULL;
2644         const char *cctype = NULL;
2645         int warn_pwd_expire;
2646         int retval = PAM_AUTH_ERR;
2647         char *username_ret = NULL;
2648         char *new_authtok_required = NULL;
2649         char *real_username = NULL;
2650         struct pwb_context *ctx = NULL;
2651
2652         retval = _pam_winbind_init_context(pamh, flags, argc, argv,
2653                                            PAM_WINBIND_AUTHENTICATE, &ctx);
2654         if (retval != PAM_SUCCESS) {
2655                 return retval;
2656         }
2657
2658         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2659
2660         /* Get the username */
2661         retval = pam_get_user(pamh, &username, NULL);
2662         if ((retval != PAM_SUCCESS) || (!username)) {
2663                 _pam_log_debug(ctx, LOG_DEBUG,
2664                                "can not get the username");
2665                 retval = PAM_SERVICE_ERR;
2666                 goto out;
2667         }
2668
2669
2670 #if defined(AIX)
2671         /* Decode the user name since AIX does not support logn user
2672            names by default.  The name is encoded as _#uid.  */
2673
2674         if (username[0] == '_') {
2675                 uid_t id = atoi(&username[1]);
2676                 struct passwd *pw = NULL;
2677
2678                 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2679                         real_username = strdup(pw->pw_name);
2680                 }
2681         }
2682 #endif
2683
2684         if (!real_username) {
2685                 /* Just making a copy of the username we got from PAM */
2686                 if ((real_username = strdup(username)) == NULL) {
2687                         _pam_log_debug(ctx, LOG_DEBUG,
2688                                        "memory allocation failure when copying "
2689                                        "username");
2690                         retval = PAM_SERVICE_ERR;
2691                         goto out;
2692                 }
2693         }
2694
2695         /* Maybe this was a UPN */
2696
2697         if (strchr(real_username, '@') != NULL) {
2698                 char *samaccountname = NULL;
2699
2700                 samaccountname = winbind_upn_to_username(ctx,
2701                                                          real_username);
2702                 if (samaccountname) {
2703                         free(real_username);
2704                         real_username = strdup(samaccountname);
2705                 }
2706         }
2707
2708         retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2709                                         _("Password: "), NULL,
2710                                         &password);
2711
2712         if (retval != PAM_SUCCESS) {
2713                 _pam_log(ctx, LOG_ERR,
2714                          "Could not retrieve user's password");
2715                 retval = PAM_AUTHTOK_ERR;
2716                 goto out;
2717         }
2718
2719         /* Let's not give too much away in the log file */
2720
2721 #ifdef DEBUG_PASSWORD
2722         _pam_log_debug(ctx, LOG_INFO,
2723                        "Verify user '%s' with password '%s'",
2724                        real_username, password);
2725 #else
2726         _pam_log_debug(ctx, LOG_INFO,
2727                        "Verify user '%s'", real_username);
2728 #endif
2729
2730         member = get_member_from_config(ctx);
2731         cctype = get_krb5_cc_type_from_config(ctx);
2732         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2733
2734         /* Now use the username to look up password */
2735         retval = winbind_auth_request(ctx, real_username, password,
2736                                       member, cctype, warn_pwd_expire,
2737                                       NULL, NULL, NULL, &username_ret);
2738
2739         if (retval == PAM_NEW_AUTHTOK_REQD ||
2740             retval == PAM_AUTHTOK_EXPIRED) {
2741
2742                 char *new_authtok_required_during_auth = NULL;
2743
2744                 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2745                 if (!new_authtok_required) {
2746                         retval = PAM_BUF_ERR;
2747                         goto out;
2748                 }
2749
2750                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2751                              new_authtok_required,
2752                              _pam_winbind_cleanup_func);
2753
2754                 retval = PAM_SUCCESS;
2755
2756                 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2757                 if (!new_authtok_required_during_auth) {
2758                         retval = PAM_BUF_ERR;
2759                         goto out;
2760                 }
2761
2762                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2763                              new_authtok_required_during_auth,
2764                              _pam_winbind_cleanup_func);
2765
2766                 goto out;
2767         }
2768
2769 out:
2770         if (username_ret) {
2771                 pam_set_item (pamh, PAM_USER, username_ret);
2772                 _pam_log_debug(ctx, LOG_INFO,
2773                                "Returned user was '%s'", username_ret);
2774                 free(username_ret);
2775         }
2776
2777         if (real_username) {
2778                 free(real_username);
2779         }
2780
2781         if (!new_authtok_required) {
2782                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2783         }
2784
2785         if (retval != PAM_SUCCESS) {
2786                 _pam_free_data_info3(pamh);
2787         }
2788
2789         _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2790
2791         TALLOC_FREE(ctx);
2792
2793         return retval;
2794 }
2795
2796 PAM_EXTERN
2797 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2798                    int argc, const char **argv)
2799 {
2800         int ret = PAM_SYSTEM_ERR;
2801         struct pwb_context *ctx = NULL;
2802
2803         ret = _pam_winbind_init_context(pamh, flags, argc, argv,
2804                                         PAM_WINBIND_SETCRED, &ctx);
2805         if (ret != PAM_SUCCESS) {
2806                 return ret;
2807         }
2808
2809         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2810
2811         switch (flags & ~PAM_SILENT) {
2812
2813                 case PAM_DELETE_CRED:
2814                         ret = _pam_delete_cred(pamh, flags, argc,
2815                                                PAM_WINBIND_SETCRED, argv);
2816                         break;
2817                 case PAM_REFRESH_CRED:
2818                         _pam_log_debug(ctx, LOG_WARNING,
2819                                        "PAM_REFRESH_CRED not implemented");
2820                         ret = PAM_SUCCESS;
2821                         break;
2822                 case PAM_REINITIALIZE_CRED:
2823                         _pam_log_debug(ctx, LOG_WARNING,
2824                                        "PAM_REINITIALIZE_CRED not implemented");
2825                         ret = PAM_SUCCESS;
2826                         break;
2827                 case PAM_ESTABLISH_CRED:
2828                         _pam_log_debug(ctx, LOG_WARNING,
2829                                        "PAM_ESTABLISH_CRED not implemented");
2830                         ret = PAM_SUCCESS;
2831                         break;
2832                 default:
2833                         ret = PAM_SYSTEM_ERR;
2834                         break;
2835         }
2836
2837         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2838
2839         TALLOC_FREE(ctx);
2840
2841         return ret;
2842 }
2843
2844 /*
2845  * Account management. We want to verify that the account exists
2846  * before returning PAM_SUCCESS
2847  */
2848 PAM_EXTERN
2849 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2850                    int argc, const char **argv)
2851 {
2852         const char *username;
2853         int ret = PAM_USER_UNKNOWN;
2854         const char *tmp = NULL;
2855         struct pwb_context *ctx = NULL;
2856
2857         ret = _pam_winbind_init_context(pamh, flags, argc, argv,
2858                                         PAM_WINBIND_ACCT_MGMT, &ctx);
2859         if (ret != PAM_SUCCESS) {
2860                 return ret;
2861         }
2862
2863         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2864
2865
2866         /* Get the username */
2867         ret = pam_get_user(pamh, &username, NULL);
2868         if ((ret != PAM_SUCCESS) || (!username)) {
2869                 _pam_log_debug(ctx, LOG_DEBUG,
2870                                "can not get the username");
2871                 ret = PAM_SERVICE_ERR;
2872                 goto out;
2873         }
2874
2875         /* Verify the username */
2876         ret = valid_user(ctx, username);
2877         switch (ret) {
2878         case -1:
2879                 /* some sort of system error. The log was already printed */
2880                 ret = PAM_SERVICE_ERR;
2881                 goto out;
2882         case 1:
2883                 /* the user does not exist */
2884                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2885                                username);
2886                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2887                         ret = PAM_IGNORE;
2888                         goto out;
2889                 }
2890                 ret = PAM_USER_UNKNOWN;
2891                 goto out;
2892         case 0:
2893                 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2894                              (const void **)&tmp);
2895                 if (tmp != NULL) {
2896                         ret = atoi(tmp);
2897                         switch (ret) {
2898                         case PAM_AUTHTOK_EXPIRED:
2899                                 /* Since new token is required in this case */
2900                                 FALL_THROUGH;
2901                         case PAM_NEW_AUTHTOK_REQD:
2902                                 _pam_log(ctx, LOG_WARNING,
2903                                          "pam_sm_acct_mgmt success but %s is set",
2904                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
2905                                 _pam_log(ctx, LOG_NOTICE,
2906                                          "user '%s' needs new password",
2907                                          username);
2908                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2909                                 ret = PAM_NEW_AUTHTOK_REQD;
2910                                 goto out;
2911                         default:
2912                                 _pam_log(ctx, LOG_WARNING,
2913                                          "pam_sm_acct_mgmt success");
2914                                 _pam_log(ctx, LOG_NOTICE,
2915                                          "user '%s' granted access", username);
2916                                 ret = PAM_SUCCESS;
2917                                 goto out;
2918                         }
2919                 }
2920
2921                 /* Otherwise, the authentication looked good */
2922                 _pam_log(ctx, LOG_NOTICE,
2923                          "user '%s' granted access", username);
2924                 ret = PAM_SUCCESS;
2925                 goto out;
2926         default:
2927                 /* we don't know anything about this return value */
2928                 _pam_log(ctx, LOG_ERR,
2929                          "internal module error (ret = %d, user = '%s')",
2930                          ret, username);
2931                 ret = PAM_SERVICE_ERR;
2932                 goto out;
2933         }
2934
2935         /* should not be reached */
2936         ret = PAM_IGNORE;
2937
2938  out:
2939
2940         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2941
2942         TALLOC_FREE(ctx);
2943
2944         return ret;
2945 }
2946
2947 PAM_EXTERN
2948 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2949                         int argc, const char **argv)
2950 {
2951         int ret = PAM_SUCCESS;
2952         struct pwb_context *ctx = NULL;
2953
2954         ret = _pam_winbind_init_context(pamh, flags, argc, argv,
2955                                         PAM_WINBIND_OPEN_SESSION, &ctx);
2956         if (ret != PAM_SUCCESS) {
2957                 return ret;
2958         }
2959
2960         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2961
2962         if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2963                 /* check and create homedir */
2964                 ret = _pam_mkhomedir(ctx);
2965         }
2966
2967         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2968
2969         TALLOC_FREE(ctx);
2970
2971         return ret;
2972 }
2973
2974 PAM_EXTERN
2975 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2976                          int argc, const char **argv)
2977 {
2978         int ret = PAM_SUCCESS;
2979         struct pwb_context *ctx = NULL;
2980
2981         ret = _pam_winbind_init_context(pamh, flags, argc, argv,
2982                                         PAM_WINBIND_CLOSE_SESSION, &ctx);
2983         if (ret != PAM_SUCCESS) {
2984                 return ret;
2985         }
2986
2987         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2988
2989         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2990
2991         TALLOC_FREE(ctx);
2992
2993         return ret;
2994 }
2995
2996 /**
2997  * evaluate whether we need to re-authenticate with kerberos after a
2998  * password change
2999  *
3000  * @param ctx PAM winbind context.
3001  * @param user The username
3002  *
3003  * @return boolean Returns true if required, false if not.
3004  */
3005
3006 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
3007                                                    const char *user)
3008 {
3009
3010         /* Make sure that we only do this if a) the chauthtok got initiated
3011          * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
3012          * later password change via the "passwd" command if done by the user
3013          * itself
3014          * NB. If we login from gdm or xdm and the password expires,
3015          * we change the password, but there is no memory cache.
3016          * Thus, even for passthrough login, we should do the
3017          * authentication again to update memory cache.
3018          * --- BoYang
3019          * */
3020
3021         const char *new_authtok_reqd_during_auth = NULL;
3022         struct passwd *pwd = NULL;
3023
3024         pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
3025                       (const void **) &new_authtok_reqd_during_auth);
3026         pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
3027                      NULL, NULL);
3028
3029         if (new_authtok_reqd_during_auth) {
3030                 return true;
3031         }
3032
3033         pwd = getpwnam(user);
3034         if (!pwd) {
3035                 return false;
3036         }
3037
3038         if (getuid() == pwd->pw_uid) {
3039                 return true;
3040         }
3041
3042         return false;
3043 }
3044
3045
3046 PAM_EXTERN
3047 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
3048                      int argc, const char **argv)
3049 {
3050         unsigned int lctrl;
3051         int ret;
3052         bool cached_login = false;
3053
3054         /* <DO NOT free() THESE> */
3055         const char *user;
3056         const char *pass_old;
3057         const char *pass_new;
3058         /* </DO NOT free() THESE> */
3059
3060         char *Announce;
3061
3062         int retry = 0;
3063         char *username_ret = NULL;
3064         struct wbcAuthErrorInfo *error = NULL;
3065         struct pwb_context *ctx = NULL;
3066
3067         ret = _pam_winbind_init_context(pamh, flags, argc, argv,
3068                                         PAM_WINBIND_CHAUTHTOK, &ctx);
3069         if (ret != PAM_SUCCESS) {
3070                 return ret;
3071         }
3072
3073         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
3074
3075         cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
3076
3077         /* clearing offline bit for auth */
3078         ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
3079
3080         /*
3081          * First get the name of a user
3082          */
3083         ret = pam_get_user(pamh, &user, _("Username: "));
3084         if (ret != PAM_SUCCESS) {
3085                 _pam_log(ctx, LOG_ERR,
3086                          "password - could not identify user");
3087                 goto out;
3088         }
3089
3090         if (user == NULL) {
3091                 _pam_log(ctx, LOG_ERR, "username was NULL!");
3092                 ret = PAM_USER_UNKNOWN;
3093                 goto out;
3094         }
3095
3096         _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
3097
3098         /* check if this is really a user in winbindd, not only in NSS */
3099         ret = valid_user(ctx, user);
3100         switch (ret) {
3101                 case 1:
3102                         ret = PAM_USER_UNKNOWN;
3103                         goto out;
3104                 case -1:
3105                         ret = PAM_SYSTEM_ERR;
3106                         goto out;
3107                 default:
3108                         break;
3109         }
3110
3111         /*
3112          * obtain and verify the current password (OLDAUTHTOK) for
3113          * the user.
3114          */
3115
3116         if (flags & PAM_PRELIM_CHECK) {
3117                 time_t pwdlastset_prelim = 0;
3118
3119                 /* instruct user what is happening */
3120
3121 #define greeting _("Changing password for")
3122                 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
3123                 if (!Announce) {
3124                         _pam_log(ctx, LOG_CRIT,
3125                                  "password - out of memory");
3126                         ret = PAM_BUF_ERR;
3127                         goto out;
3128                 }
3129 #undef greeting
3130
3131                 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
3132                 ret = _winbind_read_password(ctx, lctrl,
3133                                                 Announce,
3134                                                 _("(current) NT password: "),
3135                                                 NULL,
3136                                                 (const char **) &pass_old);
3137                 TALLOC_FREE(Announce);
3138                 if (ret != PAM_SUCCESS) {
3139                         _pam_log(ctx, LOG_NOTICE,
3140                                  "password - (old) token not obtained");
3141                         goto out;
3142                 }
3143
3144                 /* verify that this is the password for this user */
3145
3146                 ret = winbind_auth_request(ctx, user, pass_old,
3147                                            NULL, NULL, 0,
3148                                            &error, NULL,
3149                                            &pwdlastset_prelim, NULL);
3150
3151                 if (ret != PAM_ACCT_EXPIRED &&
3152                     ret != PAM_AUTHTOK_EXPIRED &&
3153                     ret != PAM_NEW_AUTHTOK_REQD &&
3154                     ret != PAM_SUCCESS) {
3155                         pass_old = NULL;
3156                         goto out;
3157                 }
3158
3159                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3160                              (void *)pwdlastset_prelim, NULL);
3161
3162                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3163                                    (const void *) pass_old);
3164                 pass_old = NULL;
3165                 if (ret != PAM_SUCCESS) {
3166                         _pam_log(ctx, LOG_CRIT,
3167                                  "failed to set PAM_OLDAUTHTOK");
3168                 }
3169         } else if (flags & PAM_UPDATE_AUTHTOK) {
3170
3171                 time_t pwdlastset_update = 0;
3172
3173                 /*
3174                  * obtain the proposed password
3175                  */
3176
3177                 /*
3178                  * get the old token back.
3179                  */
3180
3181                 ret = pam_get_item(pamh, PAM_OLDAUTHTOK, (const void **) &pass_old);
3182
3183                 if (ret != PAM_SUCCESS) {
3184                         _pam_log(ctx, LOG_NOTICE,
3185                                  "user not authenticated");
3186                         goto out;
3187                 }
3188
3189                 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3190
3191                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3192                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3193                 }
3194                 if (on(WINBIND_TRY_AUTHTOK_ARG, lctrl)) {
3195                         lctrl |= WINBIND_TRY_FIRST_PASS_ARG;
3196                 }
3197                 retry = 0;
3198                 ret = PAM_AUTHTOK_ERR;
3199                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3200                         /*
3201                          * use_authtok is to force the use of a previously entered
3202                          * password -- needed for pluggable password strength checking
3203                          */
3204
3205                         ret = _winbind_read_password(ctx, lctrl,
3206                                                      NULL,
3207                                                      _("Enter new NT password: "),
3208                                                      _("Retype new NT password: "),
3209                                                      (const char **)&pass_new);
3210
3211                         if (ret != PAM_SUCCESS) {
3212                                 _pam_log_debug(ctx, LOG_ALERT,
3213                                                "password - "
3214                                                "new password not obtained");
3215                                 pass_old = NULL;/* tidy up */
3216                                 goto out;
3217                         }
3218
3219                         /*
3220                          * At this point we know who the user is and what they
3221                          * propose as their new password. Verify that the new
3222                          * password is acceptable.
3223                          */
3224
3225                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
3226                                 pass_new = NULL;
3227                         }
3228                 }
3229
3230                 /*
3231                  * By reaching here we have approved the passwords and must now
3232                  * rebuild the password database file.
3233                  */
3234                 pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3235                              (const void **) &pwdlastset_update);
3236
3237                 /*
3238                  * if cached creds were enabled, make sure to set the
3239                  * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3240                  * update the cached creds storage - gd
3241                  */
3242                 if (cached_login) {
3243                         ctx->ctrl |= WINBIND_CACHED_LOGIN;
3244                 }
3245
3246                 ret = winbind_chauthtok_request(ctx, user, pass_old,
3247                                                 pass_new, pwdlastset_update);
3248                 if (ret != PAM_SUCCESS) {
3249                         pass_old = pass_new = NULL;
3250                         goto out;
3251                 }
3252
3253                 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3254
3255                         const char *member = NULL;
3256                         const char *cctype = NULL;
3257                         int warn_pwd_expire;
3258                         struct wbcLogonUserInfo *info = NULL;
3259
3260                         member = get_member_from_config(ctx);
3261                         cctype = get_krb5_cc_type_from_config(ctx);
3262                         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3263
3264                         /* Keep WINBIND_CACHED_LOGIN bit for
3265                          * authentication after changing the password.
3266                          * This will update the cached credentials in case
3267                          * that winbindd_dual_pam_chauthtok() fails
3268                          * to update them.
3269                          * --- BoYang
3270                          * */
3271
3272                         ret = winbind_auth_request(ctx, user, pass_new,
3273                                                    member, cctype, 0,
3274                                                    &error, &info,
3275                                                    NULL, &username_ret);
3276                         pass_old = pass_new = NULL;
3277
3278                         if (ret == PAM_SUCCESS) {
3279
3280                                 struct wbcAuthUserInfo *user_info = NULL;
3281
3282                                 if (info && info->info) {
3283                                         user_info = info->info;
3284                                 }
3285
3286                                 /* warn a user if the password is about to
3287                                  * expire soon */
3288                                 _pam_warn_password_expiry(ctx, user_info,
3289                                                           warn_pwd_expire,
3290                                                           NULL, NULL);
3291
3292                                 /* set some info3 info for other modules in the
3293                                  * stack */
3294                                 _pam_set_data_info3(ctx, user_info);
3295
3296                                 /* put krb5ccname into env */
3297                                 _pam_setup_krb5_env(ctx, info);
3298
3299                                 if (username_ret) {
3300                                         pam_set_item(pamh, PAM_USER,
3301                                                      username_ret);
3302                                         _pam_log_debug(ctx, LOG_INFO,
3303                                                        "Returned user was '%s'",
3304                                                        username_ret);
3305                                         free(username_ret);
3306                                 }
3307
3308                         }
3309
3310                         if (info && info->blobs) {
3311                                 wbcFreeMemory(info->blobs);
3312                         }
3313                         wbcFreeMemory(info);
3314
3315                         goto out;
3316                 }
3317         } else {
3318                 ret = PAM_SERVICE_ERR;
3319         }
3320
3321 out:
3322         {
3323                 /* Deal with offline errors. */
3324                 int i;
3325                 const char *codes[] = {
3326                         "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3327                         "NT_STATUS_NO_LOGON_SERVERS",
3328                         "NT_STATUS_ACCESS_DENIED"
3329                 };
3330
3331                 for (i=0; i<ARRAY_SIZE(codes); i++) {
3332                         int _ret;
3333                         if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3334                                 break;
3335                         }
3336                 }
3337         }
3338
3339         wbcFreeMemory(error);
3340
3341         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3342
3343         TALLOC_FREE(ctx);
3344
3345         return ret;
3346 }
3347
3348 #ifdef PAM_STATIC
3349
3350 /* static module data */
3351
3352 struct pam_module _pam_winbind_modstruct = {
3353         MODULE_NAME,
3354         pam_sm_authenticate,
3355         pam_sm_setcred,
3356         pam_sm_acct_mgmt,
3357         pam_sm_open_session,
3358         pam_sm_close_session,
3359         pam_sm_chauthtok
3360 };
3361
3362 #endif
3363
3364 /*
3365  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
3366  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
3367  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3368  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2008
3369  * Copyright (c) Jan Rêkorajski 1999.
3370  * Copyright (c) Andrew G. Morgan 1996-8.
3371  * Copyright (c) Alex O. Yuriev, 1996.
3372  * Copyright (c) Cristian Gafton 1996.
3373  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3374  *
3375  * Redistribution and use in source and binary forms, with or without
3376  * modification, are permitted provided that the following conditions
3377  * are met:
3378  * 1. Redistributions of source code must retain the above copyright
3379  *    notice, and the entire permission notice in its entirety,
3380  *    including the disclaimer of warranties.
3381  * 2. Redistributions in binary form must reproduce the above copyright
3382  *    notice, this list of conditions and the following disclaimer in the
3383  *    documentation and/or other materials provided with the distribution.
3384  * 3. The name of the author may not be used to endorse or promote
3385  *    products derived from this software without specific prior
3386  *    written permission.
3387  *
3388  * ALTERNATIVELY, this product may be distributed under the terms of
3389  * the GNU Public License, in which case the provisions of the GPL are
3390  * required INSTEAD OF the above restrictions.  (This clause is
3391  * necessary due to a potential bad interaction between the GPL and
3392  * the restrictions contained in a BSD-style copyright.)
3393  *
3394  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3395  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3396  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3397  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3398  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3399  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3400  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3401  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3402  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3403  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3404  * OF THE POSSIBILITY OF SUCH DAMAGE.
3405  */