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 #define CONST_DISCARD(type,ptr) ((type)(void *)ptr)
  15
  16
  17 static int wbc_error_to_pam_error(wbcErr status)
  18 {
  19         switch (status) {
  20                 case WBC_ERR_SUCCESS:
  21                         return PAM_SUCCESS;
  22                 case WBC_ERR_NOT_IMPLEMENTED:
  23                         return PAM_SERVICE_ERR;
  24                 case WBC_ERR_UNKNOWN_FAILURE:
  25                         break;
  26                 case WBC_ERR_NO_MEMORY:
  27                         return PAM_BUF_ERR;
  28                 case WBC_ERR_INVALID_SID:
  29                 case WBC_ERR_INVALID_PARAM:
  30                         break;
  31                 case WBC_ERR_WINBIND_NOT_AVAILABLE:
  32                         return PAM_AUTHINFO_UNAVAIL;
  33                 case WBC_ERR_DOMAIN_NOT_FOUND:
  34                         return PAM_AUTHINFO_UNAVAIL;
  35                 case WBC_ERR_INVALID_RESPONSE:
  36                         return PAM_BUF_ERR;
  37                 case WBC_ERR_NSS_ERROR:
  38                         return PAM_USER_UNKNOWN;
  39                 case WBC_ERR_AUTH_ERROR:
  40                         return PAM_AUTH_ERR;
  41                 case WBC_ERR_UNKNOWN_USER:
  42                         return PAM_USER_UNKNOWN;
  43                 case WBC_ERR_UNKNOWN_GROUP:
  44                         return PAM_USER_UNKNOWN;
  45                 case WBC_ERR_PWD_CHANGE_FAILED:
  46                         break;
  47         }
  48
  49         /* be paranoid */
  50         return PAM_AUTH_ERR;
  51 }
  52
  53 static const char *_pam_error_code_str(int err)
  54 {
  55         switch (err) {
  56                 case PAM_SUCCESS:
  57                         return "PAM_SUCCESS";
  58                 case PAM_OPEN_ERR:
  59                         return "PAM_OPEN_ERR";
  60                 case PAM_SYMBOL_ERR:
  61                         return "PAM_SYMBOL_ERR";
  62                 case PAM_SERVICE_ERR:
  63                         return "PAM_SERVICE_ERR";
  64                 case PAM_SYSTEM_ERR:
  65                         return "PAM_SYSTEM_ERR";
  66                 case PAM_BUF_ERR:
  67                         return "PAM_BUF_ERR";
  68                 case PAM_PERM_DENIED:
  69                         return "PAM_PERM_DENIED";
  70                 case PAM_AUTH_ERR:
  71                         return "PAM_AUTH_ERR";
  72                 case PAM_CRED_INSUFFICIENT:
  73                         return "PAM_CRED_INSUFFICIENT";
  74                 case PAM_AUTHINFO_UNAVAIL:
  75                         return "PAM_AUTHINFO_UNAVAIL";
  76                 case PAM_USER_UNKNOWN:
  77                         return "PAM_USER_UNKNOWN";
  78                 case PAM_MAXTRIES:
  79                         return "PAM_MAXTRIES";
  80                 case PAM_NEW_AUTHTOK_REQD:
  81                         return "PAM_NEW_AUTHTOK_REQD";
  82                 case PAM_ACCT_EXPIRED:
  83                         return "PAM_ACCT_EXPIRED";
  84                 case PAM_SESSION_ERR:
  85                         return "PAM_SESSION_ERR";
  86                 case PAM_CRED_UNAVAIL:
  87                         return "PAM_CRED_UNAVAIL";
  88                 case PAM_CRED_EXPIRED:
  89                         return "PAM_CRED_EXPIRED";
  90                 case PAM_CRED_ERR:
  91                         return "PAM_CRED_ERR";
  92                 case PAM_NO_MODULE_DATA:
  93                         return "PAM_NO_MODULE_DATA";
  94                 case PAM_CONV_ERR:
  95                         return "PAM_CONV_ERR";
  96                 case PAM_AUTHTOK_ERR:
  97                         return "PAM_AUTHTOK_ERR";
  98                 case PAM_AUTHTOK_RECOVER_ERR:
  99                         return "PAM_AUTHTOK_RECOVER_ERR";
 100                 case PAM_AUTHTOK_LOCK_BUSY:
 101                         return "PAM_AUTHTOK_LOCK_BUSY";
 102                 case PAM_AUTHTOK_DISABLE_AGING:
 103                         return "PAM_AUTHTOK_DISABLE_AGING";
 104                 case PAM_TRY_AGAIN:
 105                         return "PAM_TRY_AGAIN";
 106                 case PAM_IGNORE:
 107                         return "PAM_IGNORE";
 108                 case PAM_ABORT:
 109                         return "PAM_ABORT";
 110                 case PAM_AUTHTOK_EXPIRED:
 111                         return "PAM_AUTHTOK_EXPIRED";
 112 #ifdef PAM_MODULE_UNKNOWN
 113                 case PAM_MODULE_UNKNOWN:
 114                         return "PAM_MODULE_UNKNOWN";
 115 #endif
 116 #ifdef PAM_BAD_ITEM
 117                 case PAM_BAD_ITEM:
 118                         return "PAM_BAD_ITEM";
 119 #endif
 120 #ifdef PAM_CONV_AGAIN
 121                 case PAM_CONV_AGAIN:
 122                         return "PAM_CONV_AGAIN";
 123 #endif
 124 #ifdef PAM_INCOMPLETE
 125                 case PAM_INCOMPLETE:
 126                         return "PAM_INCOMPLETE";
 127 #endif
 128                 default:
 129                         return NULL;
 130         }
 131 }
 132
 133 #define _PAM_LOG_FUNCTION_ENTER(function, ctx) \
 134         do { \
 135                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] ENTER: " \
 136                                function " (flags: 0x%04x)", ctx->pamh, ctx->flags); \
 137                 _pam_log_state(ctx); \
 138         } while (0)
 139
 140 #define _PAM_LOG_FUNCTION_LEAVE(function, ctx, retval) \
 141         do { \
 142                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] LEAVE: " \
 143                                function " returning %d (%s)", ctx->pamh, retval, \
 144                                _pam_error_code_str(retval)); \
 145                 _pam_log_state(ctx); \
 146         } while (0)
 147
 148 /* data tokens */
 149
 150 #define MAX_PASSWD_TRIES        3
 151
 152 #ifdef HAVE_GETTEXT
 153 static char initialized = 0;
 154
 155 static inline void textdomain_init(void);
 156 static inline void textdomain_init(void)
 157 {
 158         if (!initialized) {
 159                 bindtextdomain(MODULE_NAME, LOCALEDIR);
 160                 initialized = 1;
 161         }
 162         return;
 163 }
 164 #endif
 165
 166
 167 /*
 168  * Work around the pam API that has functions with void ** as parameters
 169  * These lead to strict aliasing warnings with gcc.
 170  */
 171 static int _pam_get_item(const pam_handle_t *pamh,
 172                          int item_type,
 173                          const void *_item)
 174 {
 175         const void **item = (const void **)_item;
 176         return pam_get_item(pamh, item_type, item);
 177 }
 178 static int _pam_get_data(const pam_handle_t *pamh,
 179                          const char *module_data_name,
 180                          const void *_data)
 181 {
 182         const void **data = (const void **)_data;
 183         return pam_get_data(pamh, module_data_name, data);
 184 }
 185
 186 /* some syslogging */
 187
 188 #ifdef HAVE_PAM_VSYSLOG
 189 static void _pam_log_int(const pam_handle_t *pamh,
 190                          int err,
 191                          const char *format,
 192                          va_list args)
 193 {
 194         pam_vsyslog(pamh, err, format, args);
 195 }
 196 #else
 197 static void _pam_log_int(const pam_handle_t *pamh,
 198                          int err,
 199                          const char *format,
 200                          va_list args)
 201 {
 202         char *format2 = NULL;
 203         const char *service;
 204
 205         _pam_get_item(pamh, PAM_SERVICE, &service);
 206
 207         format2 = (char *)malloc(strlen(MODULE_NAME)+strlen(format)+strlen(service)+5);
 208         if (format2 == NULL) {
 209                 /* what else todo ? */
 210                 vsyslog(err, format, args);
 211                 return;
 212         }
 213
 214         sprintf(format2, "%s(%s): %s", MODULE_NAME, service, format);
 215         vsyslog(err, format2, args);
 216         SAFE_FREE(format2);
 217 }
 218 #endif /* HAVE_PAM_VSYSLOG */
 219
 220 static bool _pam_log_is_silent(int ctrl)
 221 {
 222         return on(ctrl, WINBIND_SILENT);
 223 }
 224
 225 static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 226 static void _pam_log(struct pwb_context *r, int err, const char *format, ...)
 227 {
 228         va_list args;
 229
 230         if (_pam_log_is_silent(r->ctrl)) {
 231                 return;
 232         }
 233
 234         va_start(args, format);
 235         _pam_log_int(r->pamh, err, format, args);
 236         va_end(args);
 237 }
 238 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 239 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 240 {
 241         va_list args;
 242
 243         if (_pam_log_is_silent(ctrl)) {
 244                 return;
 245         }
 246
 247         va_start(args, format);
 248         _pam_log_int(pamh, err, format, args);
 249         va_end(args);
 250 }
 251
 252 static bool _pam_log_is_debug_enabled(int ctrl)
 253 {
 254         if (ctrl == -1) {
 255                 return false;
 256         }
 257
 258         if (_pam_log_is_silent(ctrl)) {
 259                 return false;
 260         }
 261
 262         if (!(ctrl & WINBIND_DEBUG_ARG)) {
 263                 return false;
 264         }
 265
 266         return true;
 267 }
 268
 269 static bool _pam_log_is_debug_state_enabled(int ctrl)
 270 {
 271         if (!(ctrl & WINBIND_DEBUG_STATE)) {
 272                 return false;
 273         }
 274
 275         return _pam_log_is_debug_enabled(ctrl);
 276 }
 277
 278 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 279 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...)
 280 {
 281         va_list args;
 282
 283         if (!_pam_log_is_debug_enabled(r->ctrl)) {
 284                 return;
 285         }
 286
 287         va_start(args, format);
 288         _pam_log_int(r->pamh, err, format, args);
 289         va_end(args);
 290 }
 291 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 292 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 293 {
 294         va_list args;
 295
 296         if (!_pam_log_is_debug_enabled(ctrl)) {
 297                 return;
 298         }
 299
 300         va_start(args, format);
 301         _pam_log_int(pamh, err, format, args);
 302         va_end(args);
 303 }
 304
 305 static void _pam_log_state_datum(struct pwb_context *ctx,
 306                                  int item_type,
 307                                  const char *key,
 308                                  int is_string)
 309 {
 310         const void *data = NULL;
 311         if (item_type != 0) {
 312                 pam_get_item(ctx->pamh, item_type, &data);
 313         } else {
 314                 pam_get_data(ctx->pamh, key, &data);
 315         }
 316         if (data != NULL) {
 317                 const char *type = (item_type != 0) ? "ITEM" : "DATA";
 318                 if (is_string != 0) {
 319                         _pam_log_debug(ctx, LOG_DEBUG,
 320                                        "[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
 321                                        ctx->pamh, type, key, (const char *)data,
 322                                        data);
 323                 } else {
 324                         _pam_log_debug(ctx, LOG_DEBUG,
 325                                        "[pamh: %p] STATE: %s(%s) = %p",
 326                                        ctx->pamh, type, key, data);
 327                 }
 328         }
 329 }
 330
 331 #define _PAM_LOG_STATE_DATA_POINTER(ctx, module_data_name) \
 332         _pam_log_state_datum(ctx, 0, module_data_name, 0)
 333
 334 #define _PAM_LOG_STATE_DATA_STRING(ctx, module_data_name) \
 335         _pam_log_state_datum(ctx, 0, module_data_name, 1)
 336
 337 #define _PAM_LOG_STATE_ITEM_POINTER(ctx, item_type) \
 338         _pam_log_state_datum(ctx, item_type, #item_type, 0)
 339
 340 #define _PAM_LOG_STATE_ITEM_STRING(ctx, item_type) \
 341         _pam_log_state_datum(ctx, item_type, #item_type, 1)
 342
 343 #ifdef DEBUG_PASSWORD
 344 #define _LOG_PASSWORD_AS_STRING 1
 345 #else
 346 #define _LOG_PASSWORD_AS_STRING 0
 347 #endif
 348
 349 #define _PAM_LOG_STATE_ITEM_PASSWORD(ctx, item_type) \
 350         _pam_log_state_datum(ctx, item_type, #item_type, \
 351                              _LOG_PASSWORD_AS_STRING)
 352
 353 static void _pam_log_state(struct pwb_context *ctx)
 354 {
 355         if (!_pam_log_is_debug_state_enabled(ctx->ctrl)) {
 356                 return;
 357         }
 358
 359         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
 360         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
 361         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
 362         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
 363         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
 364         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
 365         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
 366         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
 367         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
 368 #ifdef PAM_FAIL_DELAY
 369         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
 370 #endif
 371 #ifdef PAM_REPOSITORY
 372         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
 373 #endif
 374
 375         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
 376         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
 377         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
 378         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
 379         _PAM_LOG_STATE_DATA_STRING(ctx,
 380                                    PAM_WINBIND_NEW_AUTHTOK_REQD);
 381                                    /* Use atoi to get PAM result code */
 382         _PAM_LOG_STATE_DATA_STRING(ctx,
 383                                    PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
 384         _PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
 385 }
 386
 387 static int _pam_parse(const pam_handle_t *pamh,
 388                       int flags,
 389                       int argc,
 390                       const char **argv,
 391                       dictionary **result_d)
 392 {
 393         int ctrl = 0;
 394         const char *config_file = NULL;
 395         int i;
 396         const char **v;
 397         dictionary *d = NULL;
 398
 399         if (flags & PAM_SILENT) {
 400                 ctrl |= WINBIND_SILENT;
 401         }
 402
 403         for (i=argc,v=argv; i-- > 0; ++v) {
 404                 if (!strncasecmp(*v, "config", strlen("config"))) {
 405                         ctrl |= WINBIND_CONFIG_FILE;
 406                         config_file = v[i];
 407                         break;
 408                 }
 409         }
 410
 411         if (config_file == NULL) {
 412                 config_file = PAM_WINBIND_CONFIG_FILE;
 413         }
 414
 415         d = iniparser_load(CONST_DISCARD(char *, config_file));
 416         if (d == NULL) {
 417                 goto config_from_pam;
 418         }
 419
 420         if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:debug"), false)) {
 421                 ctrl |= WINBIND_DEBUG_ARG;
 422         }
 423
 424         if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:debug_state"), false)) {
 425                 ctrl |= WINBIND_DEBUG_STATE;
 426         }
 427
 428         if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:cached_login"), false)) {
 429                 ctrl |= WINBIND_CACHED_LOGIN;
 430         }
 431
 432         if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:krb5_auth"), false)) {
 433                 ctrl |= WINBIND_KRB5_AUTH;
 434         }
 435
 436         if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:silent"), false)) {
 437                 ctrl |= WINBIND_SILENT;
 438         }
 439
 440         if (iniparser_getstring(d, CONST_DISCARD(char *, "global:krb5_ccache_type"), NULL) != NULL) {
 441                 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 442         }
 443
 444         if ((iniparser_getstring(d, CONST_DISCARD(char *, "global:require-membership-of"), NULL)
 445              != NULL) ||
 446             (iniparser_getstring(d, CONST_DISCARD(char *, "global:require_membership_of"), NULL)
 447              != NULL)) {
 448                 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 449         }
 450
 451         if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:try_first_pass"), false)) {
 452                 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 453         }
 454
 455         if (iniparser_getint(d, CONST_DISCARD(char *, "global:warn_pwd_expire"), 0)) {
 456                 ctrl |= WINBIND_WARN_PWD_EXPIRE;
 457         }
 458
 459         if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:mkhomedir"), false)) {
 460                 ctrl |= WINBIND_MKHOMEDIR;
 461         }
 462
 463 config_from_pam:
 464         /* step through arguments */
 465         for (i=argc,v=argv; i-- > 0; ++v) {
 466
 467                 /* generic options */
 468                 if (!strcmp(*v,"debug"))
 469                         ctrl |= WINBIND_DEBUG_ARG;
 470                 else if (!strcasecmp(*v, "debug_state"))
 471                         ctrl |= WINBIND_DEBUG_STATE;
 472                 else if (!strcasecmp(*v, "silent"))
 473                         ctrl |= WINBIND_SILENT;
 474                 else if (!strcasecmp(*v, "use_authtok"))
 475                         ctrl |= WINBIND_USE_AUTHTOK_ARG;
 476                 else if (!strcasecmp(*v, "use_first_pass"))
 477                         ctrl |= WINBIND_USE_FIRST_PASS_ARG;
 478                 else if (!strcasecmp(*v, "try_first_pass"))
 479                         ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 480                 else if (!strcasecmp(*v, "unknown_ok"))
 481                         ctrl |= WINBIND_UNKNOWN_OK_ARG;
 482                 else if (!strncasecmp(*v, "require_membership_of",
 483                                       strlen("require_membership_of")))
 484                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 485                 else if (!strncasecmp(*v, "require-membership-of",
 486                                       strlen("require-membership-of")))
 487                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 488                 else if (!strcasecmp(*v, "krb5_auth"))
 489                         ctrl |= WINBIND_KRB5_AUTH;
 490                 else if (!strncasecmp(*v, "krb5_ccache_type",
 491                                       strlen("krb5_ccache_type")))
 492                         ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 493                 else if (!strcasecmp(*v, "cached_login"))
 494                         ctrl |= WINBIND_CACHED_LOGIN;
 495                 else if (!strcasecmp(*v, "mkhomedir"))
 496                         ctrl |= WINBIND_MKHOMEDIR;
 497                 else {
 498                         __pam_log(pamh, ctrl, LOG_ERR,
 499                                  "pam_parse: unknown option: %s", *v);
 500                         return -1;
 501                 }
 502
 503         }
 504
 505         if (result_d) {
 506                 *result_d = d;
 507         } else {
 508                 if (d) {
 509                         iniparser_freedict(d);
 510                 }
 511         }
 512
 513         return ctrl;
 514 };
 515
 516 static int _pam_winbind_free_context(struct pwb_context *ctx)
 517 {
 518         if (!ctx) {
 519                 return 0;
 520         }
 521
 522         if (ctx->dict) {
 523                 iniparser_freedict(ctx->dict);
 524         }
 525
 526         return 0;
 527 }
 528
 529 static int _pam_winbind_init_context(pam_handle_t *pamh,
 530                                      int flags,
 531                                      int argc,
 532                                      const char **argv,
 533                                      struct pwb_context **ctx_p)
 534 {
 535         struct pwb_context *r = NULL;
 536
 537 #ifdef HAVE_GETTEXT
 538         textdomain_init();
 539 #endif
 540
 541         r = TALLOC_ZERO_P(NULL, struct pwb_context);
 542         if (!r) {
 543                 return PAM_BUF_ERR;
 544         }
 545
 546         talloc_set_destructor(r, _pam_winbind_free_context);
 547
 548         r->pamh = pamh;
 549         r->flags = flags;
 550         r->argc = argc;
 551         r->argv = argv;
 552         r->ctrl = _pam_parse(pamh, flags, argc, argv, &r->dict);
 553         if (r->ctrl == -1) {
 554                 TALLOC_FREE(r);
 555                 return PAM_SYSTEM_ERR;
 556         }
 557
 558         *ctx_p = r;
 559
 560         return PAM_SUCCESS;
 561 }
 562
 563 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
 564                                       void *data,
 565                                       int error_status)
 566 {
 567         int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
 568         if (_pam_log_is_debug_state_enabled(ctrl)) {
 569                 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
 570                                "[pamh: %p] CLEAN: cleaning up PAM data %p "
 571                                "(error_status = %d)", pamh, data,
 572                                error_status);
 573         }
 574         TALLOC_FREE(data);
 575 }
 576
 577
 578 static const struct ntstatus_errors {
 579         const char *ntstatus_string;
 580         const char *error_string;
 581 } ntstatus_errors[] = {
 582         {"NT_STATUS_OK",
 583                 N_("Success")},
 584         {"NT_STATUS_BACKUP_CONTROLLER",
 585                 N_("No primary Domain Controler available")},
 586         {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
 587                 N_("No domain controllers found")},
 588         {"NT_STATUS_NO_LOGON_SERVERS",
 589                 N_("No logon servers")},
 590         {"NT_STATUS_PWD_TOO_SHORT",
 591                 N_("Password too short")},
 592         {"NT_STATUS_PWD_TOO_RECENT",
 593                 N_("The password of this user is too recent to change")},
 594         {"NT_STATUS_PWD_HISTORY_CONFLICT",
 595                 N_("Password is already in password history")},
 596         {"NT_STATUS_PASSWORD_EXPIRED",
 597                 N_("Your password has expired")},
 598         {"NT_STATUS_PASSWORD_MUST_CHANGE",
 599                 N_("You need to change your password now")},
 600         {"NT_STATUS_INVALID_WORKSTATION",
 601                 N_("You are not allowed to logon from this workstation")},
 602         {"NT_STATUS_INVALID_LOGON_HOURS",
 603                 N_("You are not allowed to logon at this time")},
 604         {"NT_STATUS_ACCOUNT_EXPIRED",
 605                 N_("Your account has expired. "
 606                    "Please contact your System administrator")}, /* SCNR */
 607         {"NT_STATUS_ACCOUNT_DISABLED",
 608                 N_("Your account is disabled. "
 609                    "Please contact your System administrator")}, /* SCNR */
 610         {"NT_STATUS_ACCOUNT_LOCKED_OUT",
 611                 N_("Your account has been locked. "
 612                    "Please contact your System administrator")}, /* SCNR */
 613         {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
 614                 N_("Invalid Trust Account")},
 615         {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
 616                 N_("Invalid Trust Account")},
 617         {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
 618                 N_("Invalid Trust Account")},
 619         {"NT_STATUS_ACCESS_DENIED",
 620                 N_("Access is denied")},
 621         {NULL, NULL}
 622 };
 623
 624 static const char *_get_ntstatus_error_string(const char *nt_status_string)
 625 {
 626         int i;
 627         for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
 628                 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
 629                                 nt_status_string)) {
 630                         return _(ntstatus_errors[i].error_string);
 631                 }
 632         }
 633         return NULL;
 634 }
 635
 636 /* --- authentication management functions --- */
 637
 638 /* Attempt a conversation */
 639
 640 static int converse(const pam_handle_t *pamh,
 641                     int nargs,
 642                     struct pam_message **message,
 643                     struct pam_response **response)
 644 {
 645         int retval;
 646         struct pam_conv *conv;
 647
 648         retval = _pam_get_item(pamh, PAM_CONV, &conv);
 649         if (retval == PAM_SUCCESS) {
 650                 retval = conv->conv(nargs,
 651                                     (const struct pam_message **)message,
 652                                     response, conv->appdata_ptr);
 653         }
 654
 655         return retval; /* propagate error status */
 656 }
 657
 658
 659 static int _make_remark(struct pwb_context *ctx,
 660                         int type,
 661                         const char *text)
 662 {
 663         int retval = PAM_SUCCESS;
 664
 665         struct pam_message *pmsg[1], msg[1];
 666         struct pam_response *resp;
 667
 668         if (ctx->flags & WINBIND_SILENT) {
 669                 return PAM_SUCCESS;
 670         }
 671
 672         pmsg[0] = &msg[0];
 673         msg[0].msg = discard_const_p(char, text);
 674         msg[0].msg_style = type;
 675
 676         resp = NULL;
 677         retval = converse(ctx->pamh, 1, pmsg, &resp);
 678
 679         if (resp) {
 680                 _pam_drop_reply(resp, 1);
 681         }
 682         return retval;
 683 }
 684
 685 static int _make_remark_v(struct pwb_context *ctx,
 686                           int type,
 687                           const char *format,
 688                           va_list args)
 689 {
 690         char *var;
 691         int ret;
 692
 693         ret = vasprintf(&var, format, args);
 694         if (ret < 0) {
 695                 _pam_log(ctx, LOG_ERR, "memory allocation failure");
 696                 return ret;
 697         }
 698
 699         ret = _make_remark(ctx, type, var);
 700         SAFE_FREE(var);
 701         return ret;
 702 }
 703
 704 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 705 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
 706 {
 707         int ret;
 708         va_list args;
 709
 710         va_start(args, format);
 711         ret = _make_remark_v(ctx, type, format, args);
 712         va_end(args);
 713         return ret;
 714 }
 715
 716 static int pam_winbind_request_log(struct pwb_context *ctx,
 717                                    int retval,
 718                                    const char *user,
 719                                    const char *fn)
 720 {
 721         switch (retval) {
 722         case PAM_AUTH_ERR:
 723                 /* incorrect password */
 724                 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
 725                          "(incorrect password or invalid membership)", user);
 726                 return retval;
 727         case PAM_ACCT_EXPIRED:
 728                 /* account expired */
 729                 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
 730                          user);
 731                 return retval;
 732         case PAM_AUTHTOK_EXPIRED:
 733                 /* password expired */
 734                 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
 735                          user);
 736                 return retval;
 737         case PAM_NEW_AUTHTOK_REQD:
 738                 /* new password required */
 739                 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
 740                          "required", user);
 741                 return retval;
 742         case PAM_USER_UNKNOWN:
 743                 /* the user does not exist */
 744                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
 745                                user);
 746                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
 747                         return PAM_IGNORE;
 748                 }
 749                 return retval;
 750         case PAM_SUCCESS:
 751                 /* Otherwise, the authentication looked good */
 752                 if (strcmp(fn, "wbcLogonUser") == 0) {
 753                         _pam_log(ctx, LOG_NOTICE,
 754                                  "user '%s' granted access", user);
 755                 } else {
 756                         _pam_log(ctx, LOG_NOTICE,
 757                                  "user '%s' OK", user);
 758                 }
 759                 return retval;
 760         default:
 761                 /* we don't know anything about this return value */
 762                 _pam_log(ctx, LOG_ERR,
 763                          "internal module error (retval = %s(%d), user = '%s')",
 764                         _pam_error_code_str(retval), retval, user);
 765                 return retval;
 766         }
 767 }
 768
 769 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
 770                                        struct wbcAuthErrorInfo *e,
 771                                        wbcErr status,
 772                                        const char *username,
 773                                        const char *fn)
 774 {
 775         int ret = PAM_AUTH_ERR;
 776
 777         if (WBC_ERROR_IS_OK(status)) {
 778                 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
 779                         fn);
 780                 ret = PAM_SUCCESS;
 781                 return pam_winbind_request_log(ctx, ret, username, fn);
 782         }
 783
 784         if (e) {
 785                 if (e->pam_error != PAM_SUCCESS) {
 786                         _pam_log(ctx, LOG_ERR,
 787                                  "request %s failed: %s, "
 788                                  "PAM error: %s (%d), NTSTATUS: %s, "
 789                                  "Error message was: %s",
 790                                  fn,
 791                                  wbcErrorString(status),
 792                                  _pam_error_code_str(e->pam_error),
 793                                  e->pam_error,
 794                                  e->nt_string,
 795                                  e->display_string);
 796                         ret = e->pam_error;
 797                         return pam_winbind_request_log(ctx, ret, username, fn);
 798                 }
 799
 800                 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
 801
 802                 ret = PAM_SERVICE_ERR;
 803                 return pam_winbind_request_log(ctx, ret, username, fn);
 804         }
 805
 806         ret = wbc_error_to_pam_error(status);
 807         return pam_winbind_request_log(ctx, ret, username, fn);
 808 }
 809
 810 #if defined(HAVE_PAM_RADIO_TYPE)
 811 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 812 {
 813         struct pam_message msg, *pmsg;
 814         struct pam_response *resp = NULL;
 815         const char *prompt;
 816         int ret;
 817         bool retval = false;
 818         prompt = _("Do you want to change your password now?");
 819         pmsg = &msg;
 820         msg.msg_style = PAM_RADIO_TYPE;
 821         msg.msg = prompt;
 822         ret = converse(ctx->pamh, 1, &pmsg, &resp);
 823         if (resp == NULL) {
 824                 if (ret == PAM_SUCCESS) {
 825                         _pam_log(ctx, LOG_CRIT, "pam_winbind: system error!\n");
 826                         return false;
 827                 }
 828         }
 829         if (ret != PAM_SUCCESS) {
 830                 return false;
 831         }
 832         _pam_log(ctx, LOG_CRIT, "Received [%s] reply from application.\n", resp->resp);
 833
 834         if ((resp->resp != NULL) && (strcasecmp(resp->resp, "yes") == 0)) {
 835                 retval = true;
 836         }
 837
 838         _pam_drop_reply(resp, 1);
 839         return retval;
 840 }
 841 #else
 842 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 843 {
 844         return false;
 845 }
 846 #endif
 847
 848 /**
 849  * send a password expiry message if required
 850  *
 851  * @param ctx PAM winbind context.
 852  * @param next_change expected (calculated) next expiry date.
 853  * @param already_expired pointer to a boolean to indicate if the password is
 854  *        already expired.
 855  *
 856  * @return boolean Returns true if message has been sent, false if not.
 857  */
 858
 859 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
 860                                               time_t next_change,
 861                                               time_t now,
 862                                               int warn_pwd_expire,
 863                                               bool *already_expired,
 864                                               bool *change_pwd)
 865 {
 866         int days = 0;
 867         struct tm tm_now, tm_next_change;
 868         bool retval = false;
 869         int ret;
 870
 871         if (already_expired) {
 872                 *already_expired = false;
 873         }
 874
 875         if (change_pwd) {
 876                 *change_pwd = false;
 877         }
 878
 879         if (next_change <= now) {
 880                 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
 881                 if (already_expired) {
 882                         *already_expired = true;
 883                 }
 884                 return true;
 885         }
 886
 887         if ((next_change < 0) ||
 888             (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
 889                 return false;
 890         }
 891
 892         if ((localtime_r(&now, &tm_now) == NULL) ||
 893             (localtime_r(&next_change, &tm_next_change) == NULL)) {
 894                 return false;
 895         }
 896
 897         days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
 898                (tm_now.tm_yday+tm_now.tm_year*365);
 899
 900         if (days == 0) {
 901                 ret = _make_remark(ctx, PAM_TEXT_INFO,
 902                                 _("Your password expires today.\n"));
 903
 904                 /*
 905                  * If change_pwd and already_expired is null.
 906                  * We are just sending a notification message.
 907                  * We don't expect any response in this case.
 908                  */
 909
 910                 if (!change_pwd && !already_expired) {
 911                         return true;
 912                 }
 913
 914                 /*
 915                  * successfully sent the warning message.
 916                  * Give the user a chance to change pwd.
 917                  */
 918                 if (ret == PAM_SUCCESS) {
 919                         if (change_pwd) {
 920                                 retval = _pam_winbind_change_pwd(ctx);
 921                                 if (retval) {
 922                                         *change_pwd = true;
 923                                 }
 924                         }
 925                 }
 926                 return true;
 927         }
 928
 929         if (days > 0 && days < warn_pwd_expire) {
 930
 931                 ret = _make_remark_format(ctx, PAM_TEXT_INFO,
 932                                         _("Your password will expire in %d %s.\n"),
 933                                         days, (days > 1) ? _("days"):_("day"));
 934                 /*
 935                  * If change_pwd and already_expired is null.
 936                  * We are just sending a notification message.
 937                  * We don't expect any response in this case.
 938                  */
 939
 940                 if (!change_pwd && !already_expired) {
 941                         return true;
 942                 }
 943
 944                 /*
 945                  * successfully sent the warning message.
 946                  * Give the user a chance to change pwd.
 947                  */
 948                 if (ret == PAM_SUCCESS) {
 949                         if (change_pwd) {
 950                                 retval = _pam_winbind_change_pwd(ctx);
 951                                 if (retval) {
 952                                         *change_pwd = true;
 953                                 }
 954                         }
 955                 }
 956                 return true;
 957         }
 958
 959         return false;
 960 }
 961
 962 /**
 963  * Send a warning if the password expires in the near future
 964  *
 965  * @param ctx PAM winbind context.
 966  * @param response The full authentication response structure.
 967  * @param already_expired boolean, is the pwd already expired?
 968  *
 969  * @return void.
 970  */
 971
 972 static void _pam_warn_password_expiry(struct pwb_context *ctx,
 973                                       const struct wbcAuthUserInfo *info,
 974                                       const struct wbcUserPasswordPolicyInfo *policy,
 975                                       int warn_pwd_expire,
 976                                       bool *already_expired,
 977                                       bool *change_pwd)
 978 {
 979         time_t now = time(NULL);
 980         time_t next_change = 0;
 981
 982         if (!info || !policy) {
 983                 return;
 984         }
 985
 986         if (already_expired) {
 987                 *already_expired = false;
 988         }
 989
 990         if (change_pwd) {
 991                 *change_pwd = false;
 992         }
 993
 994         /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
 995         if (info->acct_flags & WBC_ACB_PWNOEXP) {
 996                 return;
 997         }
 998
 999         /* no point in sending a warning if this is a grace logon */
1000         if (PAM_WB_GRACE_LOGON(info->user_flags)) {
1001                 return;
1002         }
1003
1004         /* check if the info3 must change timestamp has been set */
1005         next_change = info->pass_must_change_time;
1006
1007         if (_pam_send_password_expiry_message(ctx, next_change, now,
1008                                               warn_pwd_expire,
1009                                               already_expired,
1010                                               change_pwd)) {
1011                 return;
1012         }
1013
1014         /* now check for the global password policy */
1015         /* good catch from Ralf Haferkamp: an expiry of "never" is translated
1016          * to -1 */
1017         if ((policy->expire == (int64_t)-1) ||
1018             (policy->expire == 0)) {
1019                 return;
1020         }
1021
1022         next_change = info->pass_last_set_time + policy->expire;
1023
1024         if (_pam_send_password_expiry_message(ctx, next_change, now,
1025                                               warn_pwd_expire,
1026                                               already_expired,
1027                                               change_pwd)) {
1028                 return;
1029         }
1030
1031         /* no warning sent */
1032 }
1033
1034 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
1035
1036 /**
1037  * Append a string, making sure not to overflow and to always return a
1038  * NULL-terminated string.
1039  *
1040  * @param dest Destination string buffer (must already be NULL-terminated).
1041  * @param src Source string buffer.
1042  * @param dest_buffer_size Size of dest buffer in bytes.
1043  *
1044  * @return false if dest buffer is not big enough (no bytes copied), true on
1045  * success.
1046  */
1047
1048 static bool safe_append_string(char *dest,
1049                                const char *src,
1050                                int dest_buffer_size)
1051 {
1052         int dest_length = strlen(dest);
1053         int src_length = strlen(src);
1054
1055         if (dest_length + src_length + 1 > dest_buffer_size) {
1056                 return false;
1057         }
1058
1059         memcpy(dest + dest_length, src, src_length + 1);
1060         return true;
1061 }
1062
1063 /**
1064  * Convert a names into a SID string, appending it to a buffer.
1065  *
1066  * @param ctx PAM winbind context.
1067  * @param user User in PAM request.
1068  * @param name Name to convert.
1069  * @param sid_list_buffer Where to append the string sid.
1070  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1071  *
1072  * @return false on failure, true on success.
1073  */
1074 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
1075                                        const char *user,
1076                                        const char *name,
1077                                        char *sid_list_buffer,
1078                                        int sid_list_buffer_size)
1079 {
1080         char sid_string[WBC_SID_STRING_BUFLEN];
1081
1082         /* lookup name? */
1083         if (IS_SID_STRING(name)) {
1084                 strlcpy(sid_string, name, sizeof(sid_string));
1085         } else {
1086                 wbcErr wbc_status;
1087                 struct wbcDomainSid sid;
1088                 enum wbcSidType type;
1089
1090                 _pam_log_debug(ctx, LOG_DEBUG,
1091                                "no sid given, looking up: %s\n", name);
1092
1093                 wbc_status = wbcLookupName("", name, &sid, &type);
1094                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1095                         _pam_log(ctx, LOG_INFO,
1096                                  "could not lookup name: %s\n", name);
1097                         return false;
1098                 }
1099
1100                 wbcSidToStringBuf(&sid, sid_string, sizeof(sid_string));
1101         }
1102
1103         if (!safe_append_string(sid_list_buffer, sid_string,
1104                                 sid_list_buffer_size)) {
1105                 return false;
1106         }
1107         return true;
1108 }
1109
1110 /**
1111  * Convert a list of names into a list of sids.
1112  *
1113  * @param ctx PAM winbind context.
1114  * @param user User in PAM request.
1115  * @param name_list List of names or string sids, separated by commas.
1116  * @param sid_list_buffer Where to put the list of string sids.
1117  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1118  *
1119  * @return false on failure, true on success.
1120  */
1121 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1122                                                  const char *user,
1123                                                  const char *name_list,
1124                                                  char *sid_list_buffer,
1125                                                  int sid_list_buffer_size)
1126 {
1127         bool result = false;
1128         char *current_name = NULL;
1129         const char *search_location;
1130         const char *comma;
1131         int len;
1132
1133         if (sid_list_buffer_size > 0) {
1134                 sid_list_buffer[0] = 0;
1135         }
1136
1137         search_location = name_list;
1138         while ((comma = strchr(search_location, ',')) != NULL) {
1139                 current_name = strndup(search_location,
1140                                        comma - search_location);
1141                 if (NULL == current_name) {
1142                         goto out;
1143                 }
1144
1145                 if (!winbind_name_to_sid_string(ctx, user,
1146                                                 current_name,
1147                                                 sid_list_buffer,
1148                                                 sid_list_buffer_size)) {
1149                         /*
1150                          * If one group name failed, we must not fail
1151                          * the authentication totally, continue with
1152                          * the following group names. If user belongs to
1153                          * one of the valid groups, we must allow it
1154                          * login. -- BoYang
1155                          */
1156
1157                         _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1158                                  "check if group %s is valid group.", current_name,
1159                                  current_name);
1160                         _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1161                                         "to sid, please contact your administrator to see "
1162                                         "if group %s is valid."), current_name, current_name);
1163                         SAFE_FREE(current_name);
1164                         search_location = comma + 1;
1165                         continue;
1166                 }
1167
1168                 SAFE_FREE(current_name);
1169
1170                 if (!safe_append_string(sid_list_buffer, ",",
1171                                         sid_list_buffer_size)) {
1172                         goto out;
1173                 }
1174
1175                 search_location = comma + 1;
1176         }
1177
1178         if (!winbind_name_to_sid_string(ctx, user, search_location,
1179                                         sid_list_buffer,
1180                                         sid_list_buffer_size)) {
1181                 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1182                          "check if group %s is valid group.", search_location,
1183                          search_location);
1184                 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1185                                 "to sid, please contact your administrator to see "
1186                                 "if group %s is valid."), search_location, search_location);
1187                 /*
1188                  * The lookup of the last name failed..
1189                  * It results in require_member_of_sid ends with ','
1190                  * It is malformated parameter here, overwrite the last ','.
1191                  */
1192                 len = strlen(sid_list_buffer);
1193                 if ((len != 0) && (sid_list_buffer[len - 1] == ',')) {
1194                         sid_list_buffer[len - 1] = '\0';
1195                 }
1196         }
1197
1198         result = true;
1199
1200 out:
1201         SAFE_FREE(current_name);
1202         return result;
1203 }
1204
1205 /**
1206  * put krb5ccname variable into environment
1207  *
1208  * @param ctx PAM winbind context.
1209  * @param krb5ccname env variable retrieved from winbindd.
1210  *
1211  * @return void.
1212  */
1213
1214 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1215                                 struct wbcLogonUserInfo *info)
1216 {
1217         char var[PATH_MAX];
1218         int ret;
1219         uint32_t i;
1220         const char *krb5ccname = NULL;
1221
1222         if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1223                 return;
1224         }
1225
1226         if (!info) {
1227                 return;
1228         }
1229
1230         for (i=0; i < info->num_blobs; i++) {
1231                 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1232                         krb5ccname = (const char *)info->blobs[i].blob.data;
1233                         break;
1234                 }
1235         }
1236
1237         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1238                 return;
1239         }
1240
1241         _pam_log_debug(ctx, LOG_DEBUG,
1242                        "request returned KRB5CCNAME: %s", krb5ccname);
1243
1244         if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
1245                 return;
1246         }
1247
1248         ret = pam_putenv(ctx->pamh, var);
1249         if (ret) {
1250                 _pam_log(ctx, LOG_ERR,
1251                          "failed to set KRB5CCNAME to %s: %s",
1252                          var, pam_strerror(ctx->pamh, ret));
1253         }
1254 }
1255
1256 /**
1257  * Copy unix username if available (further processed in PAM).
1258  *
1259  * @param ctx PAM winbind context
1260  * @param user_ret A pointer that holds a pointer to a string
1261  * @param unix_username A username
1262  *
1263  * @return void.
1264  */
1265
1266 static void _pam_setup_unix_username(struct pwb_context *ctx,
1267                                      char **user_ret,
1268                                      struct wbcLogonUserInfo *info)
1269 {
1270         const char *unix_username = NULL;
1271         uint32_t i;
1272
1273         if (!user_ret || !info) {
1274                 return;
1275         }
1276
1277         for (i=0; i < info->num_blobs; i++) {
1278                 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1279                         unix_username = (const char *)info->blobs[i].blob.data;
1280                         break;
1281                 }
1282         }
1283
1284         if (!unix_username || !unix_username[0]) {
1285                 return;
1286         }
1287
1288         *user_ret = strdup(unix_username);
1289 }
1290
1291 /**
1292  * Set string into the PAM stack.
1293  *
1294  * @param ctx PAM winbind context.
1295  * @param data_name Key name for pam_set_data.
1296  * @param value String value.
1297  *
1298  * @return void.
1299  */
1300
1301 static void _pam_set_data_string(struct pwb_context *ctx,
1302                                  const char *data_name,
1303                                  const char *value)
1304 {
1305         int ret;
1306
1307         if (!data_name || !value || (strlen(data_name) == 0) ||
1308              (strlen(value) == 0)) {
1309                 return;
1310         }
1311
1312         ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1313                            _pam_winbind_cleanup_func);
1314         if (ret) {
1315                 _pam_log_debug(ctx, LOG_DEBUG,
1316                                "Could not set data %s: %s\n",
1317                                data_name, pam_strerror(ctx->pamh, ret));
1318         }
1319 }
1320
1321 /**
1322  * Set info3 strings into the PAM stack.
1323  *
1324  * @param ctx PAM winbind context.
1325  * @param data_name Key name for pam_set_data.
1326  * @param value String value.
1327  *
1328  * @return void.
1329  */
1330
1331 static void _pam_set_data_info3(struct pwb_context *ctx,
1332                                 const struct wbcAuthUserInfo *info)
1333 {
1334         _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1335                              info->home_directory);
1336         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1337                              info->logon_script);
1338         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1339                              info->logon_server);
1340         _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1341                              info->profile_path);
1342 }
1343
1344 /**
1345  * Free info3 strings in the PAM stack.
1346  *
1347  * @param pamh PAM handle
1348  *
1349  * @return void.
1350  */
1351
1352 static void _pam_free_data_info3(pam_handle_t *pamh)
1353 {
1354         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1355         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1356         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1357         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1358 }
1359
1360 /**
1361  * Send PAM_ERROR_MSG for cached or grace logons.
1362  *
1363  * @param ctx PAM winbind context.
1364  * @param username User in PAM request.
1365  * @param info3_user_flgs Info3 flags containing logon type bits.
1366  *
1367  * @return void.
1368  */
1369
1370 static void _pam_warn_logon_type(struct pwb_context *ctx,
1371                                  const char *username,
1372                                  uint32_t info3_user_flgs)
1373 {
1374         /* inform about logon type */
1375         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1376
1377                 _make_remark(ctx, PAM_ERROR_MSG,
1378                              _("Grace login. "
1379                                "Please change your password as soon you're "
1380                                "online again"));
1381                 _pam_log_debug(ctx, LOG_DEBUG,
1382                                "User %s logged on using grace logon\n",
1383                                username);
1384
1385         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1386
1387                 _make_remark(ctx, PAM_ERROR_MSG,
1388                              _("Domain Controller unreachable, "
1389                                "using cached credentials instead. "
1390                                "Network resources may be unavailable"));
1391                 _pam_log_debug(ctx, LOG_DEBUG,
1392                                "User %s logged on using cached credentials\n",
1393                                username);
1394         }
1395 }
1396
1397 /**
1398  * Send PAM_ERROR_MSG for krb5 errors.
1399  *
1400  * @param ctx PAM winbind context.
1401  * @param username User in PAM request.
1402  * @param info3_user_flgs Info3 flags containing logon type bits.
1403  *
1404  * @return void.
1405  */
1406
1407 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1408                                    const char *username,
1409                                    uint32_t info3_user_flgs)
1410 {
1411         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1412                 _make_remark(ctx, PAM_ERROR_MSG,
1413                              _("Failed to establish your Kerberos Ticket cache "
1414                                "due time differences\n"
1415                                "with the domain controller.  "
1416                                "Please verify the system time.\n"));
1417                 _pam_log_debug(ctx, LOG_DEBUG,
1418                                "User %s: Clock skew when getting Krb5 TGT\n",
1419                                username);
1420         }
1421 }
1422
1423 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1424                                        const struct wbcAuthErrorInfo *e,
1425                                        const char *nt_status_string,
1426                                        int *pam_err)
1427 {
1428         const char *ntstatus = NULL;
1429         const char *error_string = NULL;
1430
1431         if (!e || !pam_err) {
1432                 return false;
1433         }
1434
1435         ntstatus = e->nt_string;
1436         if (!ntstatus) {
1437                 return false;
1438         }
1439
1440         if (strcasecmp(ntstatus, nt_status_string) == 0) {
1441
1442                 error_string = _get_ntstatus_error_string(nt_status_string);
1443                 if (error_string) {
1444                         _make_remark(ctx, PAM_ERROR_MSG, error_string);
1445                         *pam_err = e->pam_error;
1446                         return true;
1447                 }
1448
1449                 if (e->display_string) {
1450                         _make_remark(ctx, PAM_ERROR_MSG, _(e->display_string));
1451                         *pam_err = e->pam_error;
1452                         return true;
1453                 }
1454
1455                 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1456                 *pam_err = e->pam_error;
1457
1458                 return true;
1459         }
1460
1461         return false;
1462 };
1463
1464 /**
1465  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1466  *
1467  * @param i The wbcUserPasswordPolicyInfo struct.
1468  *
1469  * @return string (caller needs to talloc_free).
1470  */
1471
1472 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1473                                                  struct wbcUserPasswordPolicyInfo *i)
1474 {
1475         char *str = NULL;
1476
1477         if (!i) {
1478                 goto failed;
1479         }
1480
1481         str = talloc_asprintf(ctx, _("Your password "));
1482         if (!str) {
1483                 goto failed;
1484         }
1485
1486         if (i->min_length_password > 0) {
1487                 str = talloc_asprintf_append(str,
1488                                _("must be at least %d characters; "),
1489                                i->min_length_password);
1490                 if (!str) {
1491                         goto failed;
1492                 }
1493         }
1494
1495         if (i->password_history > 0) {
1496                 str = talloc_asprintf_append(str,
1497                                _("cannot repeat any of your previous %d "
1498                                 "passwords; "),
1499                                i->password_history);
1500                 if (!str) {
1501                         goto failed;
1502                 }
1503         }
1504
1505         if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1506                 str = talloc_asprintf_append(str,
1507                                _("must contain capitals, numerals "
1508                                  "or punctuation; "
1509                                  "and cannot contain your account "
1510                                  "or full name; "));
1511                 if (!str) {
1512                         goto failed;
1513                 }
1514         }
1515
1516         str = talloc_asprintf_append(str,
1517                        _("Please type a different password. "
1518                          "Type a password which meets these requirements in "
1519                          "both text boxes."));
1520         if (!str) {
1521                 goto failed;
1522         }
1523
1524         return str;
1525
1526  failed:
1527         TALLOC_FREE(str);
1528         return NULL;
1529 }
1530
1531 static int _pam_create_homedir(struct pwb_context *ctx,
1532                                const char *dirname,
1533                                mode_t mode)
1534 {
1535         struct stat sbuf;
1536
1537         if (stat(dirname, &sbuf) == 0) {
1538                 return PAM_SUCCESS;
1539         }
1540
1541         if (mkdir(dirname, mode) != 0) {
1542
1543                 _make_remark_format(ctx, PAM_TEXT_INFO,
1544                                     _("Creating directory: %s failed: %s"),
1545                                     dirname, strerror(errno));
1546                 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1547                  dirname, strerror(errno));
1548                  return PAM_PERM_DENIED;
1549         }
1550
1551         return PAM_SUCCESS;
1552 }
1553
1554 static int _pam_chown_homedir(struct pwb_context *ctx,
1555                               const char *dirname,
1556                               uid_t uid,
1557                               gid_t gid)
1558 {
1559         if (chown(dirname, uid, gid) != 0) {
1560                 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1561                          dirname, strerror(errno));
1562                 return PAM_PERM_DENIED;
1563         }
1564
1565         return PAM_SUCCESS;
1566 }
1567
1568 static int _pam_mkhomedir(struct pwb_context *ctx)
1569 {
1570         struct passwd *pwd = NULL;
1571         char *token = NULL;
1572         char *create_dir = NULL;
1573         char *user_dir = NULL;
1574         int ret;
1575         const char *username;
1576         mode_t mode = 0700;
1577         char *safe_ptr = NULL;
1578         char *p = NULL;
1579
1580         /* Get the username */
1581         ret = pam_get_user(ctx->pamh, &username, NULL);
1582         if ((ret != PAM_SUCCESS) || (!username)) {
1583                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1584                 return PAM_SERVICE_ERR;
1585         }
1586
1587         pwd = getpwnam(username);
1588         if (pwd == NULL) {
1589                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1590                 return PAM_USER_UNKNOWN;
1591         }
1592         _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1593
1594         ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1595         if (ret == PAM_SUCCESS) {
1596                 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1597                                          pwd->pw_uid,
1598                                          pwd->pw_gid);
1599         }
1600
1601         if (ret == PAM_SUCCESS) {
1602                 return ret;
1603         }
1604
1605         /* maybe we need to create parent dirs */
1606         create_dir = talloc_strdup(ctx, "/");
1607         if (!create_dir) {
1608                 return PAM_BUF_ERR;
1609         }
1610
1611         /* find final directory */
1612         user_dir = strrchr(pwd->pw_dir, '/');
1613         if (!user_dir) {
1614                 return PAM_BUF_ERR;
1615         }
1616         user_dir++;
1617
1618         _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1619
1620         p = pwd->pw_dir;
1621
1622         while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1623
1624                 mode = 0755;
1625
1626                 p = NULL;
1627
1628                 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1629
1630                 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1631                 if (!create_dir) {
1632                         return PAM_BUF_ERR;
1633                 }
1634                 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1635
1636                 if (strcmp(token, user_dir) == 0) {
1637                         _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1638                         mode = 0700;
1639                 }
1640
1641                 ret = _pam_create_homedir(ctx, create_dir, mode);
1642                 if (ret) {
1643                         return ret;
1644                 }
1645         }
1646
1647         return _pam_chown_homedir(ctx, create_dir,
1648                                   pwd->pw_uid,
1649                                   pwd->pw_gid);
1650 }
1651
1652 /* talk to winbindd */
1653 static int winbind_auth_request(struct pwb_context *ctx,
1654                                 const char *user,
1655                                 const char *pass,
1656                                 const char *member,
1657                                 const char *cctype,
1658                                 const int warn_pwd_expire,
1659                                 struct wbcAuthErrorInfo **p_error,
1660                                 struct wbcLogonUserInfo **p_info,
1661                                 struct wbcUserPasswordPolicyInfo **p_policy,
1662                                 time_t *pwd_last_set,
1663                                 char **user_ret)
1664 {
1665         wbcErr wbc_status;
1666
1667         struct wbcLogonUserParams logon;
1668         char membership_of[1024];
1669         uid_t user_uid = -1;
1670         uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1671                          WBFLAG_PAM_GET_PWD_POLICY;
1672
1673         struct wbcLogonUserInfo *info = NULL;
1674         struct wbcAuthUserInfo *user_info = NULL;
1675         struct wbcAuthErrorInfo *error = NULL;
1676         struct wbcUserPasswordPolicyInfo *policy = NULL;
1677
1678         int ret = PAM_AUTH_ERR;
1679         int i;
1680         const char *codes[] = {
1681                 "NT_STATUS_PASSWORD_EXPIRED",
1682                 "NT_STATUS_PASSWORD_MUST_CHANGE",
1683                 "NT_STATUS_INVALID_WORKSTATION",
1684                 "NT_STATUS_INVALID_LOGON_HOURS",
1685                 "NT_STATUS_ACCOUNT_EXPIRED",
1686                 "NT_STATUS_ACCOUNT_DISABLED",
1687                 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1688                 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1689                 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1690                 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1691                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1692                 "NT_STATUS_NO_LOGON_SERVERS",
1693                 "NT_STATUS_WRONG_PASSWORD",
1694                 "NT_STATUS_ACCESS_DENIED"
1695         };
1696
1697         if (pwd_last_set) {
1698                 *pwd_last_set = 0;
1699         }
1700
1701         /* Krb5 auth always has to go against the KDC of the user's realm */
1702
1703         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1704                 flags           |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1705         }
1706
1707         if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1708                 struct passwd *pwd = NULL;
1709
1710                 pwd = getpwnam(user);
1711                 if (pwd == NULL) {
1712                         return PAM_USER_UNKNOWN;
1713                 }
1714                 user_uid        = pwd->pw_uid;
1715         }
1716
1717         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1718
1719                 _pam_log_debug(ctx, LOG_DEBUG,
1720                                "enabling krb5 login flag\n");
1721
1722                 flags           |= WBFLAG_PAM_KRB5 |
1723                                    WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1724         }
1725
1726         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1727                 _pam_log_debug(ctx, LOG_DEBUG,
1728                                "enabling cached login flag\n");
1729                 flags           |= WBFLAG_PAM_CACHED_LOGIN;
1730         }
1731
1732         if (user_ret) {
1733                 *user_ret = NULL;
1734                 flags           |= WBFLAG_PAM_UNIX_NAME;
1735         }
1736
1737         if (cctype != NULL) {
1738                 _pam_log_debug(ctx, LOG_DEBUG,
1739                                "enabling request for a %s krb5 ccache\n",
1740                                cctype);
1741         }
1742
1743         if (member != NULL) {
1744
1745                 ZERO_STRUCT(membership_of);
1746
1747                 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1748                                                           membership_of,
1749                                                           sizeof(membership_of))) {
1750                         _pam_log_debug(ctx, LOG_ERR,
1751                                        "failed to serialize membership of sid "
1752                                        "\"%s\"\n", member);
1753                         return PAM_AUTH_ERR;
1754                 }
1755         }
1756
1757         ZERO_STRUCT(logon);
1758
1759         logon.username                  = user;
1760         logon.password                  = pass;
1761
1762         if (cctype) {
1763                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1764                                              &logon.blobs,
1765                                              "krb5_cc_type",
1766                                              0,
1767                                              (uint8_t *)cctype,
1768                                              strlen(cctype)+1);
1769                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1770                         goto done;
1771                 }
1772         }
1773
1774         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1775                                      &logon.blobs,
1776                                      "flags",
1777                                      0,
1778                                      (uint8_t *)&flags,
1779                                      sizeof(flags));
1780         if (!WBC_ERROR_IS_OK(wbc_status)) {
1781                 goto done;
1782         }
1783
1784         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1785                                      &logon.blobs,
1786                                      "user_uid",
1787                                      0,
1788                                      (uint8_t *)&user_uid,
1789                                      sizeof(user_uid));
1790         if (!WBC_ERROR_IS_OK(wbc_status)) {
1791                 goto done;
1792         }
1793
1794         if (member) {
1795                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1796                                              &logon.blobs,
1797                                              "membership_of",
1798                                              0,
1799                                              (uint8_t *)membership_of,
1800                                              sizeof(membership_of));
1801                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1802                         goto done;
1803                 }
1804         }
1805
1806         wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1807         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1808                                           user, "wbcLogonUser");
1809         wbcFreeMemory(logon.blobs);
1810         logon.blobs = NULL;
1811
1812         if (info && info->info) {
1813                 user_info = info->info;
1814         }
1815
1816         if (pwd_last_set && user_info) {
1817                 *pwd_last_set = user_info->pass_last_set_time;
1818         }
1819
1820         if (p_info && info) {
1821                 *p_info = info;
1822         }
1823
1824         if (p_policy && policy) {
1825                 *p_policy = policy;
1826         }
1827
1828         if (p_error && error) {
1829                 /* We want to process the error in the caller. */
1830                 *p_error = error;
1831                 return ret;
1832         }
1833
1834         for (i=0; i<ARRAY_SIZE(codes); i++) {
1835                 int _ret = ret;
1836                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1837                         ret = _ret;
1838                         goto done;
1839                 }
1840         }
1841
1842         if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1843
1844                 bool already_expired = false;
1845                 bool change_pwd = false;
1846
1847                 /* warn a user if the password is about to expire soon */
1848                 _pam_warn_password_expiry(ctx, user_info, policy,
1849                                           warn_pwd_expire,
1850                                           &already_expired,
1851                                           &change_pwd);
1852
1853                 if (already_expired == true) {
1854
1855                         SMB_TIME_T last_set = user_info->pass_last_set_time;
1856
1857                         _pam_log_debug(ctx, LOG_DEBUG,
1858                                        "Password has expired "
1859                                        "(Password was last set: %lld, "
1860                                        "the policy says it should expire here "
1861                                        "%lld (now it's: %ld))\n",
1862                                        (long long int)last_set,
1863                                        (long long int)last_set +
1864                                        policy->expire,
1865                                        (long)time(NULL));
1866
1867                         return PAM_AUTHTOK_EXPIRED;
1868                 }
1869
1870                 if (change_pwd) {
1871                         ret = PAM_NEW_AUTHTOK_REQD;
1872                         goto done;
1873                 }
1874
1875                 /* inform about logon type */
1876                 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1877
1878                 /* inform about krb5 failures */
1879                 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1880
1881                 /* set some info3 info for other modules in the stack */
1882                 _pam_set_data_info3(ctx, user_info);
1883
1884                 /* put krb5ccname into env */
1885                 _pam_setup_krb5_env(ctx, info);
1886
1887                 /* If winbindd returned a username, return the pointer to it
1888                  * here. */
1889                 _pam_setup_unix_username(ctx, user_ret, info);
1890         }
1891
1892  done:
1893         wbcFreeMemory(logon.blobs);
1894         if (info && info->blobs && !p_info) {
1895                 wbcFreeMemory(info->blobs);
1896         }
1897         if (error && !p_error) {
1898                 wbcFreeMemory(error);
1899         }
1900         if (info && !p_info) {
1901                 wbcFreeMemory(info);
1902         }
1903         if (policy && !p_policy) {
1904                 wbcFreeMemory(policy);
1905         }
1906
1907         return ret;
1908 }
1909
1910 /* talk to winbindd */
1911 static int winbind_chauthtok_request(struct pwb_context *ctx,
1912                                      const char *user,
1913                                      const char *oldpass,
1914                                      const char *newpass,
1915                                      time_t pwd_last_set)
1916 {
1917         wbcErr wbc_status;
1918         struct wbcChangePasswordParams params;
1919         struct wbcAuthErrorInfo *error = NULL;
1920         struct wbcUserPasswordPolicyInfo *policy = NULL;
1921         enum wbcPasswordChangeRejectReason reject_reason = -1;
1922         uint32_t flags = 0;
1923
1924         int i;
1925         const char *codes[] = {
1926                 "NT_STATUS_BACKUP_CONTROLLER",
1927                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1928                 "NT_STATUS_NO_LOGON_SERVERS",
1929                 "NT_STATUS_ACCESS_DENIED",
1930                 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1931                 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1932                 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1933         };
1934         int ret = PAM_AUTH_ERR;
1935
1936         ZERO_STRUCT(params);
1937
1938         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1939                 flags |= WBFLAG_PAM_KRB5 |
1940                          WBFLAG_PAM_CONTACT_TRUSTDOM;
1941         }
1942
1943         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1944                 flags |= WBFLAG_PAM_CACHED_LOGIN;
1945         }
1946
1947         params.account_name             = user;
1948         params.level                    = WBC_AUTH_USER_LEVEL_PLAIN;
1949         params.old_password.plaintext   = oldpass;
1950         params.new_password.plaintext   = newpass;
1951         params.flags                    = flags;
1952
1953         wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1954         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1955                                           user, "wbcChangeUserPasswordEx");
1956
1957         if (WBC_ERROR_IS_OK(wbc_status)) {
1958                 _pam_log(ctx, LOG_NOTICE,
1959                          "user '%s' password changed", user);
1960                 return PAM_SUCCESS;
1961         }
1962
1963         if (!error) {
1964                 wbcFreeMemory(policy);
1965                 return ret;
1966         }
1967
1968         for (i=0; i<ARRAY_SIZE(codes); i++) {
1969                 int _ret = ret;
1970                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1971                         ret = _ret;
1972                         goto done;
1973                 }
1974         }
1975
1976         if (!strcasecmp(error->nt_string,
1977                         "NT_STATUS_PASSWORD_RESTRICTION")) {
1978
1979                 char *pwd_restriction_string = NULL;
1980                 SMB_TIME_T min_pwd_age = 0;
1981
1982                 if (policy) {
1983                         min_pwd_age     = policy->min_passwordage;
1984                 }
1985
1986                 /* FIXME: avoid to send multiple PAM messages after another */
1987                 switch (reject_reason) {
1988                         case -1:
1989                                 break;
1990                         case WBC_PWD_CHANGE_NO_ERROR:
1991                                 if ((min_pwd_age > 0) &&
1992                                     (pwd_last_set + min_pwd_age > time(NULL))) {
1993                                         PAM_WB_REMARK_DIRECT(ctx,
1994                                              "NT_STATUS_PWD_TOO_RECENT");
1995                                 }
1996                                 break;
1997                         case WBC_PWD_CHANGE_PASSWORD_TOO_SHORT:
1998                                 PAM_WB_REMARK_DIRECT(ctx,
1999                                         "NT_STATUS_PWD_TOO_SHORT");
2000                                 break;
2001                         case WBC_PWD_CHANGE_PWD_IN_HISTORY:
2002                                 PAM_WB_REMARK_DIRECT(ctx,
2003                                         "NT_STATUS_PWD_HISTORY_CONFLICT");
2004                                 break;
2005                         case WBC_PWD_CHANGE_NOT_COMPLEX:
2006                                 _make_remark(ctx, PAM_ERROR_MSG,
2007                                              _("Password does not meet "
2008                                                "complexity requirements"));
2009                                 break;
2010                         default:
2011                                 _pam_log_debug(ctx, LOG_DEBUG,
2012                                                "unknown password change "
2013                                                "reject reason: %d",
2014                                                reject_reason);
2015                                 break;
2016                 }
2017
2018                 pwd_restriction_string =
2019                         _pam_compose_pwd_restriction_string(ctx, policy);
2020                 if (pwd_restriction_string) {
2021                         _make_remark(ctx, PAM_ERROR_MSG,
2022                                      pwd_restriction_string);
2023                         TALLOC_FREE(pwd_restriction_string);
2024                 }
2025         }
2026  done:
2027         wbcFreeMemory(error);
2028         wbcFreeMemory(policy);
2029
2030         return ret;
2031 }
2032
2033 /*
2034  * Checks if a user has an account
2035  *
2036  * return values:
2037  *       1  = User not found
2038  *       0  = OK
2039  *      -1  = System error
2040  */
2041 static int valid_user(struct pwb_context *ctx,
2042                       const char *user)
2043 {
2044         /* check not only if the user is available over NSS calls, also make
2045          * sure it's really a winbind user, this is important when stacking PAM
2046          * modules in the 'account' or 'password' facility. */
2047
2048         wbcErr wbc_status;
2049         struct passwd *pwd = NULL;
2050         struct passwd *wb_pwd = NULL;
2051
2052         pwd = getpwnam(user);
2053         if (pwd == NULL) {
2054                 return 1;
2055         }
2056
2057         wbc_status = wbcGetpwnam(user, &wb_pwd);
2058         wbcFreeMemory(wb_pwd);
2059         if (!WBC_ERROR_IS_OK(wbc_status)) {
2060                 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
2061                         wbcErrorString(wbc_status));
2062         }
2063
2064         switch (wbc_status) {
2065                 case WBC_ERR_UNKNOWN_USER:
2066                         return 1;
2067                 case WBC_ERR_SUCCESS:
2068                         return 0;
2069                 default:
2070                         break;
2071         }
2072         return -1;
2073 }
2074
2075 static char *_pam_delete(register char *xx)
2076 {
2077         _pam_overwrite(xx);
2078         _pam_drop(xx);
2079         return NULL;
2080 }
2081
2082 /*
2083  * obtain a password from the user
2084  */
2085
2086 static int _winbind_read_password(struct pwb_context *ctx,
2087                                   unsigned int ctrl,
2088                                   const char *comment,
2089                                   const char *prompt1,
2090                                   const char *prompt2,
2091                                   const char **pass)
2092 {
2093         int authtok_flag;
2094         int retval;
2095         const char *item;
2096         char *token;
2097
2098         _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2099
2100         /*
2101          * make sure nothing inappropriate gets returned
2102          */
2103
2104         *pass = token = NULL;
2105
2106         /*
2107          * which authentication token are we getting?
2108          */
2109
2110         if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2111                 authtok_flag = PAM_OLDAUTHTOK;
2112         } else {
2113                 authtok_flag = PAM_AUTHTOK;
2114         }
2115
2116         /*
2117          * should we obtain the password from a PAM item ?
2118          */
2119
2120         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2121             on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2122                 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
2123                 if (retval != PAM_SUCCESS) {
2124                         /* very strange. */
2125                         _pam_log(ctx, LOG_ALERT,
2126                                  "pam_get_item returned error "
2127                                  "to unix-read-password");
2128                         return retval;
2129                 } else if (item != NULL) {      /* we have a password! */
2130                         *pass = item;
2131                         item = NULL;
2132                         _pam_log(ctx, LOG_DEBUG,
2133                                  "pam_get_item returned a password");
2134                         return PAM_SUCCESS;
2135                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2136                         return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2137                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2138                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
2139                         return PAM_AUTHTOK_RECOVER_ERR;
2140                 }
2141         }
2142         /*
2143          * getting here implies we will have to get the password from the
2144          * user directly.
2145          */
2146
2147         {
2148                 struct pam_message msg[3], *pmsg[3];
2149                 struct pam_response *resp;
2150                 int i, replies;
2151
2152                 /* prepare to converse */
2153
2154                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2155                         pmsg[0] = &msg[0];
2156                         msg[0].msg_style = PAM_TEXT_INFO;
2157                         msg[0].msg = discard_const_p(char, comment);
2158                         i = 1;
2159                 } else {
2160                         i = 0;
2161                 }
2162
2163                 pmsg[i] = &msg[i];
2164                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2165                 msg[i++].msg = discard_const_p(char, prompt1);
2166                 replies = 1;
2167
2168                 if (prompt2 != NULL) {
2169                         pmsg[i] = &msg[i];
2170                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2171                         msg[i++].msg = discard_const_p(char, prompt2);
2172                         ++replies;
2173                 }
2174                 /* so call the conversation expecting i responses */
2175                 resp = NULL;
2176                 retval = converse(ctx->pamh, i, pmsg, &resp);
2177                 if (resp == NULL) {
2178                         if (retval == PAM_SUCCESS) {
2179                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2180                         }
2181                         goto done;
2182                 }
2183                 if (retval != PAM_SUCCESS) {
2184                         _pam_drop_reply(resp, i);
2185                         goto done;
2186                 }
2187
2188                 /* interpret the response */
2189
2190                 token = x_strdup(resp[i - replies].resp);
2191                 if (!token) {
2192                         _pam_log(ctx, LOG_NOTICE,
2193                                  "could not recover "
2194                                  "authentication token");
2195                         retval = PAM_AUTHTOK_RECOVER_ERR;
2196                         goto done;
2197                 }
2198
2199                 if (replies == 2) {
2200                         /* verify that password entered correctly */
2201                         if (!resp[i - 1].resp ||
2202                             strcmp(token, resp[i - 1].resp)) {
2203                                 _pam_delete(token);     /* mistyped */
2204                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2205                                 _make_remark(ctx, PAM_ERROR_MSG,
2206                                              MISTYPED_PASS);
2207                         }
2208                 }
2209
2210                 /*
2211                  * tidy up the conversation (resp_retcode) is ignored
2212                  * -- what is it for anyway? AGM
2213                  */
2214                 _pam_drop_reply(resp, i);
2215         }
2216
2217  done:
2218         if (retval != PAM_SUCCESS) {
2219                 _pam_log_debug(ctx, LOG_DEBUG,
2220                                "unable to obtain a password");
2221                 return retval;
2222         }
2223         /* 'token' is the entered password */
2224
2225         /* we store this password as an item */
2226
2227         retval = pam_set_item(ctx->pamh, authtok_flag, token);
2228         _pam_delete(token);     /* clean it up */
2229         if (retval != PAM_SUCCESS ||
2230             (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
2231
2232                 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2233                 return retval;
2234
2235         }
2236
2237         *pass = item;
2238         item = NULL;            /* break link to password */
2239
2240         return PAM_SUCCESS;
2241 }
2242
2243 static const char *get_conf_item_string(struct pwb_context *ctx,
2244                                         const char *item,
2245                                         int config_flag)
2246 {
2247         int i = 0;
2248         const char *parm_opt = NULL;
2249
2250         if (!(ctx->ctrl & config_flag)) {
2251                 goto out;
2252         }
2253
2254         /* let the pam opt take precedence over the pam_winbind.conf option */
2255         for (i=0; i<ctx->argc; i++) {
2256
2257                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2258                         char *p;
2259
2260                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2261                                 _pam_log(ctx, LOG_INFO,
2262                                          "no \"=\" delimiter for \"%s\" found\n",
2263                                          item);
2264                                 goto out;
2265                         }
2266                         _pam_log_debug(ctx, LOG_INFO,
2267                                        "PAM config: %s '%s'\n", item, p+1);
2268                         return p + 1;
2269                 }
2270         }
2271
2272         if (ctx->dict) {
2273                 char *key = NULL;
2274
2275                 key = talloc_asprintf(ctx, "global:%s", item);
2276                 if (!key) {
2277                         goto out;
2278                 }
2279
2280                 parm_opt = iniparser_getstring(ctx->dict, key, NULL);
2281                 TALLOC_FREE(key);
2282
2283                 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2284                                item, parm_opt);
2285         }
2286 out:
2287         return parm_opt;
2288 }
2289
2290 static int get_config_item_int(struct pwb_context *ctx,
2291                                const char *item,
2292                                int config_flag)
2293 {
2294         int i, parm_opt = -1;
2295
2296         if (!(ctx->ctrl & config_flag)) {
2297                 goto out;
2298         }
2299
2300         /* let the pam opt take precedence over the pam_winbind.conf option */
2301         for (i = 0; i < ctx->argc; i++) {
2302
2303                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2304                         char *p;
2305
2306                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2307                                 _pam_log(ctx, LOG_INFO,
2308                                          "no \"=\" delimiter for \"%s\" found\n",
2309                                          item);
2310                                 goto out;
2311                         }
2312                         parm_opt = atoi(p + 1);
2313                         _pam_log_debug(ctx, LOG_INFO,
2314                                        "PAM config: %s '%d'\n",
2315                                        item, parm_opt);
2316                         return parm_opt;
2317                 }
2318         }
2319
2320         if (ctx->dict) {
2321                 char *key = NULL;
2322
2323                 key = talloc_asprintf(ctx, "global:%s", item);
2324                 if (!key) {
2325                         goto out;
2326                 }
2327
2328                 parm_opt = iniparser_getint(ctx->dict, key, -1);
2329                 TALLOC_FREE(key);
2330
2331                 _pam_log_debug(ctx, LOG_INFO,
2332                                "CONFIG file: %s '%d'\n",
2333                                item, parm_opt);
2334         }
2335 out:
2336         return parm_opt;
2337 }
2338
2339 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2340 {
2341         return get_conf_item_string(ctx, "krb5_ccache_type",
2342                                     WINBIND_KRB5_CCACHE_TYPE);
2343 }
2344
2345 static const char *get_member_from_config(struct pwb_context *ctx)
2346 {
2347         const char *ret = NULL;
2348         ret = get_conf_item_string(ctx, "require_membership_of",
2349                                    WINBIND_REQUIRED_MEMBERSHIP);
2350         if (ret) {
2351                 return ret;
2352         }
2353         return get_conf_item_string(ctx, "require-membership-of",
2354                                     WINBIND_REQUIRED_MEMBERSHIP);
2355 }
2356
2357 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2358 {
2359         int ret;
2360         ret = get_config_item_int(ctx, "warn_pwd_expire",
2361                                   WINBIND_WARN_PWD_EXPIRE);
2362         /* no or broken setting */
2363         if (ret <= 0) {
2364                 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2365         }
2366         return ret;
2367 }
2368
2369 /**
2370  * Retrieve the winbind separator.
2371  *
2372  * @param ctx PAM winbind context.
2373  *
2374  * @return string separator character. NULL on failure.
2375  */
2376
2377 static char winbind_get_separator(struct pwb_context *ctx)
2378 {
2379         wbcErr wbc_status;
2380         static struct wbcInterfaceDetails *details = NULL;
2381
2382         wbc_status = wbcInterfaceDetails(&details);
2383         if (!WBC_ERROR_IS_OK(wbc_status)) {
2384                 _pam_log(ctx, LOG_ERR,
2385                          "Could not retrieve winbind interface details: %s",
2386                          wbcErrorString(wbc_status));
2387                 return '\0';
2388         }
2389
2390         if (!details) {
2391                 return '\0';
2392         }
2393
2394         return details->winbind_separator;
2395 }
2396
2397
2398 /**
2399  * Convert a upn to a name.
2400  *
2401  * @param ctx PAM winbind context.
2402  * @param upn  USer UPN to be trabslated.
2403  *
2404  * @return converted name. NULL pointer on failure. Caller needs to free.
2405  */
2406
2407 static char* winbind_upn_to_username(struct pwb_context *ctx,
2408                                      const char *upn)
2409 {
2410         char sep;
2411         wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2412         struct wbcDomainSid sid;
2413         enum wbcSidType type;
2414         char *domain = NULL;
2415         char *name;
2416         char *p;
2417
2418         /* This cannot work when the winbind separator = @ */
2419
2420         sep = winbind_get_separator(ctx);
2421         if (!sep || sep == '@') {
2422                 return NULL;
2423         }
2424
2425         name = talloc_strdup(ctx, upn);
2426         if (!name) {
2427                 return NULL;
2428         }
2429         if ((p = strchr(name, '@')) != NULL) {
2430                 *p = 0;
2431                 domain = p + 1;
2432         }
2433
2434         /* Convert the UPN to a SID */
2435
2436         wbc_status = wbcLookupName(domain, name, &sid, &type);
2437         if (!WBC_ERROR_IS_OK(wbc_status)) {
2438                 return NULL;
2439         }
2440
2441         /* Convert the the SID back to the sAMAccountName */
2442
2443         wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2444         if (!WBC_ERROR_IS_OK(wbc_status)) {
2445                 return NULL;
2446         }
2447
2448         return talloc_asprintf(ctx, "%s\\%s", domain, name);
2449 }
2450
2451 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2452                          int argc, const char **argv)
2453 {
2454         int retval = PAM_SUCCESS;
2455         struct pwb_context *ctx = NULL;
2456         struct wbcLogoffUserParams logoff;
2457         struct wbcAuthErrorInfo *error = NULL;
2458         const char *user;
2459         wbcErr wbc_status = WBC_ERR_SUCCESS;
2460
2461         ZERO_STRUCT(logoff);
2462
2463         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2464         if (retval) {
2465                 goto out;
2466         }
2467
2468         _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2469
2470         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2471
2472                 /* destroy the ccache here */
2473
2474                 uint32_t wbc_flags = 0;
2475                 const char *ccname = NULL;
2476                 struct passwd *pwd = NULL;
2477
2478                 retval = pam_get_user(pamh, &user, _("Username: "));
2479                 if (retval) {
2480                         _pam_log(ctx, LOG_ERR,
2481                                  "could not identify user");
2482                         goto out;
2483                 }
2484
2485                 if (user == NULL) {
2486                         _pam_log(ctx, LOG_ERR,
2487                                  "username was NULL!");
2488                         retval = PAM_USER_UNKNOWN;
2489                         goto out;
2490                 }
2491
2492                 _pam_log_debug(ctx, LOG_DEBUG,
2493                                "username [%s] obtained", user);
2494
2495                 ccname = pam_getenv(pamh, "KRB5CCNAME");
2496                 if (ccname == NULL) {
2497                         _pam_log_debug(ctx, LOG_DEBUG,
2498                                        "user has no KRB5CCNAME environment");
2499                 }
2500
2501                 pwd = getpwnam(user);
2502                 if (pwd == NULL) {
2503                         retval = PAM_USER_UNKNOWN;
2504                         goto out;
2505                 }
2506
2507                 wbc_flags = WBFLAG_PAM_KRB5 |
2508                         WBFLAG_PAM_CONTACT_TRUSTDOM;
2509
2510                 logoff.username         = user;
2511
2512                 if (ccname) {
2513                         wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2514                                                      &logoff.blobs,
2515                                                      "ccfilename",
2516                                                      0,
2517                                                      (uint8_t *)ccname,
2518                                                      strlen(ccname)+1);
2519                         if (!WBC_ERROR_IS_OK(wbc_status)) {
2520                                 goto out;
2521                         }
2522                 }
2523
2524                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2525                                              &logoff.blobs,
2526                                              "flags",
2527                                              0,
2528                                              (uint8_t *)&wbc_flags,
2529                                              sizeof(wbc_flags));
2530                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2531                         goto out;
2532                 }
2533
2534                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2535                                              &logoff.blobs,
2536                                              "user_uid",
2537                                              0,
2538                                              (uint8_t *)&pwd->pw_uid,
2539                                              sizeof(pwd->pw_uid));
2540                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2541                         goto out;
2542                 }
2543
2544                 wbc_status = wbcLogoffUserEx(&logoff, &error);
2545                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2546                                                      user, "wbcLogoffUser");
2547                 wbcFreeMemory(error);
2548                 wbcFreeMemory(logoff.blobs);
2549                 logoff.blobs = NULL;
2550
2551                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2552                         _pam_log(ctx, LOG_INFO,
2553                                  "failed to logoff user %s: %s\n",
2554                                          user, wbcErrorString(wbc_status));
2555                 }
2556         }
2557
2558 out:
2559         if (logoff.blobs) {
2560                 wbcFreeMemory(logoff.blobs);
2561         }
2562
2563         if (!WBC_ERROR_IS_OK(wbc_status)) {
2564                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2565                      user, "wbcLogoffUser");
2566         }
2567
2568         /*
2569          * Delete the krb5 ccname variable from the PAM environment
2570          * if it was set by winbind.
2571          */
2572         if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2573                 pam_putenv(pamh, "KRB5CCNAME");
2574         }
2575
2576         _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2577
2578         TALLOC_FREE(ctx);
2579
2580         return retval;
2581 }
2582
2583 PAM_EXTERN
2584 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2585                         int argc, const char **argv)
2586 {
2587         const char *username;
2588         const char *password;
2589         const char *member = NULL;
2590         const char *cctype = NULL;
2591         int warn_pwd_expire;
2592         int retval = PAM_AUTH_ERR;
2593         char *username_ret = NULL;
2594         char *new_authtok_required = NULL;
2595         char *real_username = NULL;
2596         struct pwb_context *ctx = NULL;
2597
2598         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2599         if (retval) {
2600                 goto out;
2601         }
2602
2603         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2604
2605         /* Get the username */
2606         retval = pam_get_user(pamh, &username, NULL);
2607         if ((retval != PAM_SUCCESS) || (!username)) {
2608                 _pam_log_debug(ctx, LOG_DEBUG,
2609                                "can not get the username");
2610                 retval = PAM_SERVICE_ERR;
2611                 goto out;
2612         }
2613
2614
2615 #if defined(AIX)
2616         /* Decode the user name since AIX does not support logn user
2617            names by default.  The name is encoded as _#uid.  */
2618
2619         if (username[0] == '_') {
2620                 uid_t id = atoi(&username[1]);
2621                 struct passwd *pw = NULL;
2622
2623                 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2624                         real_username = strdup(pw->pw_name);
2625                 }
2626         }
2627 #endif
2628
2629         if (!real_username) {
2630                 /* Just making a copy of the username we got from PAM */
2631                 if ((real_username = strdup(username)) == NULL) {
2632                         _pam_log_debug(ctx, LOG_DEBUG,
2633                                        "memory allocation failure when copying "
2634                                        "username");
2635                         retval = PAM_SERVICE_ERR;
2636                         goto out;
2637                 }
2638         }
2639
2640         /* Maybe this was a UPN */
2641
2642         if (strchr(real_username, '@') != NULL) {
2643                 char *samaccountname = NULL;
2644
2645                 samaccountname = winbind_upn_to_username(ctx,
2646                                                          real_username);
2647                 if (samaccountname) {
2648                         free(real_username);
2649                         real_username = strdup(samaccountname);
2650                 }
2651         }
2652
2653         retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2654                                         _("Password: "), NULL,
2655                                         &password);
2656
2657         if (retval != PAM_SUCCESS) {
2658                 _pam_log(ctx, LOG_ERR,
2659                          "Could not retrieve user's password");
2660                 retval = PAM_AUTHTOK_ERR;
2661                 goto out;
2662         }
2663
2664         /* Let's not give too much away in the log file */
2665
2666 #ifdef DEBUG_PASSWORD
2667         _pam_log_debug(ctx, LOG_INFO,
2668                        "Verify user '%s' with password '%s'",
2669                        real_username, password);
2670 #else
2671         _pam_log_debug(ctx, LOG_INFO,
2672                        "Verify user '%s'", real_username);
2673 #endif
2674
2675         member = get_member_from_config(ctx);
2676         cctype = get_krb5_cc_type_from_config(ctx);
2677         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2678
2679         /* Now use the username to look up password */
2680         retval = winbind_auth_request(ctx, real_username, password,
2681                                       member, cctype, warn_pwd_expire,
2682                                       NULL, NULL, NULL,
2683                                       NULL, &username_ret);
2684
2685         if (retval == PAM_NEW_AUTHTOK_REQD ||
2686             retval == PAM_AUTHTOK_EXPIRED) {
2687
2688                 char *new_authtok_required_during_auth = NULL;
2689
2690                 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2691                 if (!new_authtok_required) {
2692                         retval = PAM_BUF_ERR;
2693                         goto out;
2694                 }
2695
2696                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2697                              new_authtok_required,
2698                              _pam_winbind_cleanup_func);
2699
2700                 retval = PAM_SUCCESS;
2701
2702                 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2703                 if (!new_authtok_required_during_auth) {
2704                         retval = PAM_BUF_ERR;
2705                         goto out;
2706                 }
2707
2708                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2709                              new_authtok_required_during_auth,
2710                              _pam_winbind_cleanup_func);
2711
2712                 goto out;
2713         }
2714
2715 out:
2716         if (username_ret) {
2717                 pam_set_item (pamh, PAM_USER, username_ret);
2718                 _pam_log_debug(ctx, LOG_INFO,
2719                                "Returned user was '%s'", username_ret);
2720                 free(username_ret);
2721         }
2722
2723         if (real_username) {
2724                 free(real_username);
2725         }
2726
2727         if (!new_authtok_required) {
2728                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2729         }
2730
2731         if (retval != PAM_SUCCESS) {
2732                 _pam_free_data_info3(pamh);
2733         }
2734
2735         _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2736
2737         TALLOC_FREE(ctx);
2738
2739         return retval;
2740 }
2741
2742 PAM_EXTERN
2743 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2744                    int argc, const char **argv)
2745 {
2746         int ret = PAM_SYSTEM_ERR;
2747         struct pwb_context *ctx = NULL;
2748
2749         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2750         if (ret) {
2751                 goto out;
2752         }
2753
2754         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2755
2756         switch (flags & ~PAM_SILENT) {
2757
2758                 case PAM_DELETE_CRED:
2759                         ret = _pam_delete_cred(pamh, flags, argc, argv);
2760                         break;
2761                 case PAM_REFRESH_CRED:
2762                         _pam_log_debug(ctx, LOG_WARNING,
2763                                        "PAM_REFRESH_CRED not implemented");
2764                         ret = PAM_SUCCESS;
2765                         break;
2766                 case PAM_REINITIALIZE_CRED:
2767                         _pam_log_debug(ctx, LOG_WARNING,
2768                                        "PAM_REINITIALIZE_CRED not implemented");
2769                         ret = PAM_SUCCESS;
2770                         break;
2771                 case PAM_ESTABLISH_CRED:
2772                         _pam_log_debug(ctx, LOG_WARNING,
2773                                        "PAM_ESTABLISH_CRED not implemented");
2774                         ret = PAM_SUCCESS;
2775                         break;
2776                 default:
2777                         ret = PAM_SYSTEM_ERR;
2778                         break;
2779         }
2780
2781  out:
2782
2783         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2784
2785         TALLOC_FREE(ctx);
2786
2787         return ret;
2788 }
2789
2790 /*
2791  * Account management. We want to verify that the account exists
2792  * before returning PAM_SUCCESS
2793  */
2794 PAM_EXTERN
2795 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2796                    int argc, const char **argv)
2797 {
2798         const char *username;
2799         int ret = PAM_USER_UNKNOWN;
2800         void *tmp = NULL;
2801         struct pwb_context *ctx = NULL;
2802
2803         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2804         if (ret) {
2805                 goto out;
2806         }
2807
2808         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2809
2810
2811         /* Get the username */
2812         ret = pam_get_user(pamh, &username, NULL);
2813         if ((ret != PAM_SUCCESS) || (!username)) {
2814                 _pam_log_debug(ctx, LOG_DEBUG,
2815                                "can not get the username");
2816                 ret = PAM_SERVICE_ERR;
2817                 goto out;
2818         }
2819
2820         /* Verify the username */
2821         ret = valid_user(ctx, username);
2822         switch (ret) {
2823         case -1:
2824                 /* some sort of system error. The log was already printed */
2825                 ret = PAM_SERVICE_ERR;
2826                 goto out;
2827         case 1:
2828                 /* the user does not exist */
2829                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2830                                username);
2831                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2832                         ret = PAM_IGNORE;
2833                         goto out;
2834                 }
2835                 ret = PAM_USER_UNKNOWN;
2836                 goto out;
2837         case 0:
2838                 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2839                              (const void **)&tmp);
2840                 if (tmp != NULL) {
2841                         ret = atoi((const char *)tmp);
2842                         switch (ret) {
2843                         case PAM_AUTHTOK_EXPIRED:
2844                                 /* fall through, since new token is required in this case */
2845                         case PAM_NEW_AUTHTOK_REQD:
2846                                 _pam_log(ctx, LOG_WARNING,
2847                                          "pam_sm_acct_mgmt success but %s is set",
2848                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
2849                                 _pam_log(ctx, LOG_NOTICE,
2850                                          "user '%s' needs new password",
2851                                          username);
2852                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2853                                 ret = PAM_NEW_AUTHTOK_REQD;
2854                                 goto out;
2855                         default:
2856                                 _pam_log(ctx, LOG_WARNING,
2857                                          "pam_sm_acct_mgmt success");
2858                                 _pam_log(ctx, LOG_NOTICE,
2859                                          "user '%s' granted access", username);
2860                                 ret = PAM_SUCCESS;
2861                                 goto out;
2862                         }
2863                 }
2864
2865                 /* Otherwise, the authentication looked good */
2866                 _pam_log(ctx, LOG_NOTICE,
2867                          "user '%s' granted access", username);
2868                 ret = PAM_SUCCESS;
2869                 goto out;
2870         default:
2871                 /* we don't know anything about this return value */
2872                 _pam_log(ctx, LOG_ERR,
2873                          "internal module error (ret = %d, user = '%s')",
2874                          ret, username);
2875                 ret = PAM_SERVICE_ERR;
2876                 goto out;
2877         }
2878
2879         /* should not be reached */
2880         ret = PAM_IGNORE;
2881
2882  out:
2883
2884         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2885
2886         TALLOC_FREE(ctx);
2887
2888         return ret;
2889 }
2890
2891 PAM_EXTERN
2892 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2893                         int argc, const char **argv)
2894 {
2895         int ret = PAM_SUCCESS;
2896         struct pwb_context *ctx = NULL;
2897
2898         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2899         if (ret) {
2900                 goto out;
2901         }
2902
2903         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2904
2905         if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2906                 /* check and create homedir */
2907                 ret = _pam_mkhomedir(ctx);
2908         }
2909  out:
2910         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2911
2912         TALLOC_FREE(ctx);
2913
2914         return ret;
2915 }
2916
2917 PAM_EXTERN
2918 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2919                          int argc, const char **argv)
2920 {
2921         int ret = PAM_SUCCESS;
2922         struct pwb_context *ctx = NULL;
2923
2924         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2925         if (ret) {
2926                 goto out;
2927         }
2928
2929         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2930
2931 out:
2932         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2933
2934         TALLOC_FREE(ctx);
2935
2936         return ret;
2937 }
2938
2939 /**
2940  * evaluate whether we need to re-authenticate with kerberos after a
2941  * password change
2942  *
2943  * @param ctx PAM winbind context.
2944  * @param user The username
2945  *
2946  * @return boolean Returns true if required, false if not.
2947  */
2948
2949 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2950                                                    const char *user)
2951 {
2952
2953         /* Make sure that we only do this if a) the chauthtok got initiated
2954          * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2955          * later password change via the "passwd" command if done by the user
2956          * itself
2957          * NB. If we login from gdm or xdm and the password expires,
2958          * we change the password, but there is no memory cache.
2959          * Thus, even for passthrough login, we should do the
2960          * authentication again to update memory cache.
2961          * --- BoYang
2962          * */
2963
2964         char *new_authtok_reqd_during_auth = NULL;
2965         struct passwd *pwd = NULL;
2966
2967         _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2968                       &new_authtok_reqd_during_auth);
2969         pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2970                      NULL, NULL);
2971
2972         if (new_authtok_reqd_during_auth) {
2973                 return true;
2974         }
2975
2976         pwd = getpwnam(user);
2977         if (!pwd) {
2978                 return false;
2979         }
2980
2981         if (getuid() == pwd->pw_uid) {
2982                 return true;
2983         }
2984
2985         return false;
2986 }
2987
2988
2989 PAM_EXTERN
2990 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2991                      int argc, const char **argv)
2992 {
2993         unsigned int lctrl;
2994         int ret;
2995         bool cached_login = false;
2996
2997         /* <DO NOT free() THESE> */
2998         const char *user;
2999         char *pass_old, *pass_new;
3000         /* </DO NOT free() THESE> */
3001
3002         char *Announce;
3003
3004         int retry = 0;
3005         char *username_ret = NULL;
3006         struct wbcAuthErrorInfo *error = NULL;
3007         struct pwb_context *ctx = NULL;
3008
3009         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
3010         if (ret) {
3011                 goto out;
3012         }
3013
3014         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
3015
3016         cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
3017
3018         /* clearing offline bit for auth */
3019         ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
3020
3021         /*
3022          * First get the name of a user
3023          */
3024         ret = pam_get_user(pamh, &user, _("Username: "));
3025         if (ret) {
3026                 _pam_log(ctx, LOG_ERR,
3027                          "password - could not identify user");
3028                 goto out;
3029         }
3030
3031         if (user == NULL) {
3032                 _pam_log(ctx, LOG_ERR, "username was NULL!");
3033                 ret = PAM_USER_UNKNOWN;
3034                 goto out;
3035         }
3036
3037         _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
3038
3039         /* check if this is really a user in winbindd, not only in NSS */
3040         ret = valid_user(ctx, user);
3041         switch (ret) {
3042                 case 1:
3043                         ret = PAM_USER_UNKNOWN;
3044                         goto out;
3045                 case -1:
3046                         ret = PAM_SYSTEM_ERR;
3047                         goto out;
3048                 default:
3049                         break;
3050         }
3051
3052         /*
3053          * obtain and verify the current password (OLDAUTHTOK) for
3054          * the user.
3055          */
3056
3057         if (flags & PAM_PRELIM_CHECK) {
3058                 time_t pwdlastset_prelim = 0;
3059
3060                 /* instruct user what is happening */
3061
3062 #define greeting _("Changing password for")
3063                 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
3064                 if (!Announce) {
3065                         _pam_log(ctx, LOG_CRIT,
3066                                  "password - out of memory");
3067                         ret = PAM_BUF_ERR;
3068                         goto out;
3069                 }
3070 #undef greeting
3071
3072                 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
3073                 ret = _winbind_read_password(ctx, lctrl,
3074                                                 Announce,
3075                                                 _("(current) NT password: "),
3076                                                 NULL,
3077                                                 (const char **) &pass_old);
3078                 TALLOC_FREE(Announce);
3079                 if (ret != PAM_SUCCESS) {
3080                         _pam_log(ctx, LOG_NOTICE,
3081                                  "password - (old) token not obtained");
3082                         goto out;
3083                 }
3084
3085                 /* verify that this is the password for this user */
3086
3087                 ret = winbind_auth_request(ctx, user, pass_old,
3088                                            NULL, NULL, 0,
3089                                            &error, NULL, NULL,
3090                                            &pwdlastset_prelim, NULL);
3091
3092                 if (ret != PAM_ACCT_EXPIRED &&
3093                     ret != PAM_AUTHTOK_EXPIRED &&
3094                     ret != PAM_NEW_AUTHTOK_REQD &&
3095                     ret != PAM_SUCCESS) {
3096                         pass_old = NULL;
3097                         goto out;
3098                 }
3099
3100                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3101                              (void *)pwdlastset_prelim, NULL);
3102
3103                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3104                                    (const void *) pass_old);
3105                 pass_old = NULL;
3106                 if (ret != PAM_SUCCESS) {
3107                         _pam_log(ctx, LOG_CRIT,
3108                                  "failed to set PAM_OLDAUTHTOK");
3109                 }
3110         } else if (flags & PAM_UPDATE_AUTHTOK) {
3111
3112                 time_t pwdlastset_update = 0;
3113
3114                 /*
3115                  * obtain the proposed password
3116                  */
3117
3118                 /*
3119                  * get the old token back.
3120                  */
3121
3122                 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
3123
3124                 if (ret != PAM_SUCCESS) {
3125                         _pam_log(ctx, LOG_NOTICE,
3126                                  "user not authenticated");
3127                         goto out;
3128                 }
3129
3130                 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3131
3132                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3133                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3134                 }
3135                 retry = 0;
3136                 ret = PAM_AUTHTOK_ERR;
3137                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3138                         /*
3139                          * use_authtok is to force the use of a previously entered
3140                          * password -- needed for pluggable password strength checking
3141                          */
3142
3143                         ret = _winbind_read_password(ctx, lctrl,
3144                                                      NULL,
3145                                                      _("Enter new NT password: "),
3146                                                      _("Retype new NT password: "),
3147                                                      (const char **)&pass_new);
3148
3149                         if (ret != PAM_SUCCESS) {
3150                                 _pam_log_debug(ctx, LOG_ALERT,
3151                                                "password - "
3152                                                "new password not obtained");
3153                                 pass_old = NULL;/* tidy up */
3154                                 goto out;
3155                         }
3156
3157                         /*
3158                          * At this point we know who the user is and what they
3159                          * propose as their new password. Verify that the new
3160                          * password is acceptable.
3161                          */
3162
3163                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
3164                                 pass_new = NULL;
3165                         }
3166                 }
3167
3168                 /*
3169                  * By reaching here we have approved the passwords and must now
3170                  * rebuild the password database file.
3171                  */
3172                 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3173                               &pwdlastset_update);
3174
3175                 /*
3176                  * if cached creds were enabled, make sure to set the
3177                  * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3178                  * update the cached creds storage - gd
3179                  */
3180                 if (cached_login) {
3181                         ctx->ctrl |= WINBIND_CACHED_LOGIN;
3182                 }
3183
3184                 ret = winbind_chauthtok_request(ctx, user, pass_old,
3185                                                 pass_new, pwdlastset_update);
3186                 if (ret) {
3187                         pass_old = pass_new = NULL;
3188                         goto out;
3189                 }
3190
3191                 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3192
3193                         const char *member = NULL;
3194                         const char *cctype = NULL;
3195                         int warn_pwd_expire;
3196                         struct wbcLogonUserInfo *info = NULL;
3197                         struct wbcUserPasswordPolicyInfo *policy = NULL;
3198
3199                         member = get_member_from_config(ctx);
3200                         cctype = get_krb5_cc_type_from_config(ctx);
3201                         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3202
3203                         /* Keep WINBIND_CACHED_LOGIN bit for
3204                          * authentication after changing the password.
3205                          * This will update the cached credentials in case
3206                          * that winbindd_dual_pam_chauthtok() fails
3207                          * to update them.
3208                          * --- BoYang
3209                          * */
3210
3211                         ret = winbind_auth_request(ctx, user, pass_new,
3212                                                    member, cctype, 0,
3213                                                    &error, &info, &policy,
3214                                                    NULL, &username_ret);
3215                         pass_old = pass_new = NULL;
3216
3217                         if (ret == PAM_SUCCESS) {
3218
3219                                 struct wbcAuthUserInfo *user_info = NULL;
3220
3221                                 if (info && info->info) {
3222                                         user_info = info->info;
3223                                 }
3224
3225                                 /* warn a user if the password is about to
3226                                  * expire soon */
3227                                 _pam_warn_password_expiry(ctx, user_info, policy,
3228                                                           warn_pwd_expire,
3229                                                           NULL, NULL);
3230
3231                                 /* set some info3 info for other modules in the
3232                                  * stack */
3233                                 _pam_set_data_info3(ctx, user_info);
3234
3235                                 /* put krb5ccname into env */
3236                                 _pam_setup_krb5_env(ctx, info);
3237
3238                                 if (username_ret) {
3239                                         pam_set_item(pamh, PAM_USER,
3240                                                      username_ret);
3241                                         _pam_log_debug(ctx, LOG_INFO,
3242                                                        "Returned user was '%s'",
3243                                                        username_ret);
3244                                         free(username_ret);
3245                                 }
3246
3247                         }
3248
3249                         if (info && info->blobs) {
3250                                 wbcFreeMemory(info->blobs);
3251                         }
3252                         wbcFreeMemory(info);
3253                         wbcFreeMemory(policy);
3254
3255                         goto out;
3256                 }
3257         } else {
3258                 ret = PAM_SERVICE_ERR;
3259         }
3260
3261 out:
3262         {
3263                 /* Deal with offline errors. */
3264                 int i;
3265                 const char *codes[] = {
3266                         "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3267                         "NT_STATUS_NO_LOGON_SERVERS",
3268                         "NT_STATUS_ACCESS_DENIED"
3269                 };
3270
3271                 for (i=0; i<ARRAY_SIZE(codes); i++) {
3272                         int _ret;
3273                         if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3274                                 break;
3275                         }
3276                 }
3277         }
3278
3279         wbcFreeMemory(error);
3280
3281         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3282
3283         TALLOC_FREE(ctx);
3284
3285         return ret;
3286 }
3287
3288 #ifdef PAM_STATIC
3289
3290 /* static module data */
3291
3292 struct pam_module _pam_winbind_modstruct = {
3293         MODULE_NAME,
3294         pam_sm_authenticate,
3295         pam_sm_setcred,
3296         pam_sm_acct_mgmt,
3297         pam_sm_open_session,
3298         pam_sm_close_session,
3299         pam_sm_chauthtok
3300 };
3301
3302 #endif
3303
3304 /*
3305  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
3306  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
3307  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3308  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2008
3309  * Copyright (c) Jan Rêkorajski 1999.
3310  * Copyright (c) Andrew G. Morgan 1996-8.
3311  * Copyright (c) Alex O. Yuriev, 1996.
3312  * Copyright (c) Cristian Gafton 1996.
3313  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3314  *
3315  * Redistribution and use in source and binary forms, with or without
3316  * modification, are permitted provided that the following conditions
3317  * are met:
3318  * 1. Redistributions of source code must retain the above copyright
3319  *    notice, and the entire permission notice in its entirety,
3320  *    including the disclaimer of warranties.
3321  * 2. Redistributions in binary form must reproduce the above copyright
3322  *    notice, this list of conditions and the following disclaimer in the
3323  *    documentation and/or other materials provided with the distribution.
3324  * 3. The name of the author may not be used to endorse or promote
3325  *    products derived from this software without specific prior
3326  *    written permission.
3327  *
3328  * ALTERNATIVELY, this product may be distributed under the terms of
3329  * the GNU Public License, in which case the provisions of the GPL are
3330  * required INSTEAD OF the above restrictions.  (This clause is
3331  * necessary due to a potential bad interaction between the GPL and
3332  * the restrictions contained in a BSD-style copyright.)
3333  *
3334  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3335  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3336  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3337  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3338  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3339  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3340  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3341  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3342  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3343  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3344  * OF THE POSSIBILITY OF SUCH DAMAGE.
3345  */