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, dyn_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_getstr(d, CONST_DISCARD(char *, "global:krb5_ccache_type")) != NULL) {
 441                 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 442         }
 443
 444         if ((iniparser_getstr(d, CONST_DISCARD(char *, "global:require-membership-of"))
 445              != NULL) ||
 446             (iniparser_getstr(d, CONST_DISCARD(char *, "global:require_membership_of"))
 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 /* PAM_RADIO_TYPE is linux-only. */
 811 #ifdef LINUX
 812 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 813 {
 814         struct pam_message msg, *pmsg;
 815         struct pam_response *resp = NULL;
 816         const char *prompt;
 817         int ret;
 818         bool retval = false;
 819         prompt = _("Do you want to change your password now?");
 820         pmsg = &msg;
 821         msg.msg_style = PAM_RADIO_TYPE;
 822         msg.msg = prompt;
 823         ret = converse(ctx->pamh, 1, &pmsg, &resp);
 824         if (resp == NULL) {
 825                 if (ret == PAM_SUCCESS) {
 826                         _pam_log(ctx, LOG_CRIT, "pam_winbind: system error!\n");
 827                         return false;
 828                 }
 829         }
 830         if (ret != PAM_SUCCESS) {
 831                 return false;
 832         }
 833         _pam_log(ctx, LOG_CRIT, "Received [%s] reply from application.\n", resp->resp);
 834
 835         if (strcasecmp(resp->resp, "yes") == 0) {
 836                 retval = true;
 837         }
 838
 839         _pam_drop_reply(resp, 1);
 840         return retval;
 841 }
 842 #else
 843 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 844 {
 845         return false;
 846 }
 847 #endif
 848
 849
 850 /**
 851  * send a password expiry message if required
 852  *
 853  * @param ctx PAM winbind context.
 854  * @param next_change expected (calculated) next expiry date.
 855  * @param already_expired pointer to a boolean to indicate if the password is
 856  *        already expired.
 857  *
 858  * @return boolean Returns true if message has been sent, false if not.
 859  */
 860
 861 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
 862                                               time_t next_change,
 863                                               time_t now,
 864                                               int warn_pwd_expire,
 865                                               bool *already_expired,
 866                                               bool *change_pwd)
 867 {
 868         int days = 0;
 869         struct tm tm_now, tm_next_change;
 870         bool retval = false;
 871         int ret;
 872
 873         if (already_expired) {
 874                 *already_expired = false;
 875         }
 876
 877         if (change_pwd) {
 878                 *change_pwd = false;
 879         }
 880
 881         if (next_change <= now) {
 882                 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
 883                 if (already_expired) {
 884                         *already_expired = true;
 885                 }
 886                 return true;
 887         }
 888
 889         if ((next_change < 0) ||
 890             (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
 891                 return false;
 892         }
 893
 894         if ((localtime_r(&now, &tm_now) == NULL) ||
 895             (localtime_r(&next_change, &tm_next_change) == NULL)) {
 896                 return false;
 897         }
 898
 899         days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
 900                (tm_now.tm_yday+tm_now.tm_year*365);
 901
 902         if (days == 0) {
 903                 ret = _make_remark(ctx, PAM_TEXT_INFO,
 904                                 _("Your password expires today.\n"));
 905
 906                 /*
 907                  * If change_pwd and already_expired is null.
 908                  * We are just sending a notification message.
 909                  * We don't expect any response in this case.
 910                  */
 911
 912                 if (!change_pwd && !already_expired) {
 913                         return true;
 914                 }
 915
 916                 /*
 917                  * successfully sent the warning message.
 918                  * Give the user a chance to change pwd.
 919                  */
 920                 if (ret == PAM_SUCCESS) {
 921                         if (change_pwd) {
 922                                 retval = _pam_winbind_change_pwd(ctx);
 923                                 if (retval) {
 924                                         *change_pwd = true;
 925                                 }
 926                         }
 927                 }
 928                 return true;
 929         }
 930
 931         if (days > 0 && days < warn_pwd_expire) {
 932
 933                 ret = _make_remark_format(ctx, PAM_TEXT_INFO,
 934                                         _("Your password will expire in %d %s.\n"),
 935                                         days, (days > 1) ? _("days"):_("day"));
 936                 /*
 937                  * If change_pwd and already_expired is null.
 938                  * We are just sending a notification message.
 939                  * We don't expect any response in this case.
 940                  */
 941
 942                 if (!change_pwd && !already_expired) {
 943                         return true;
 944                 }
 945
 946                 /*
 947                  * successfully sent the warning message.
 948                  * Give the user a chance to change pwd.
 949                  */
 950                 if (ret == PAM_SUCCESS) {
 951                         if (change_pwd) {
 952                                 retval = _pam_winbind_change_pwd(ctx);
 953                                 if (retval) {
 954                                         *change_pwd = true;
 955                                 }
 956                         }
 957                 }
 958                 return true;
 959         }
 960
 961         return false;
 962 }
 963
 964 /**
 965  * Send a warning if the password expires in the near future
 966  *
 967  * @param ctx PAM winbind context.
 968  * @param response The full authentication response structure.
 969  * @param already_expired boolean, is the pwd already expired?
 970  *
 971  * @return void.
 972  */
 973
 974 static void _pam_warn_password_expiry(struct pwb_context *ctx,
 975                                       const struct wbcAuthUserInfo *info,
 976                                       const struct wbcUserPasswordPolicyInfo *policy,
 977                                       int warn_pwd_expire,
 978                                       bool *already_expired,
 979                                       bool *change_pwd)
 980 {
 981         time_t now = time(NULL);
 982         time_t next_change = 0;
 983
 984         if (!info || !policy) {
 985                 return;
 986         }
 987
 988         if (already_expired) {
 989                 *already_expired = false;
 990         }
 991
 992         if (change_pwd) {
 993                 *change_pwd = false;
 994         }
 995
 996         /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
 997         if (info->acct_flags & WBC_ACB_PWNOEXP) {
 998                 return;
 999         }
1000
1001         /* no point in sending a warning if this is a grace logon */
1002         if (PAM_WB_GRACE_LOGON(info->user_flags)) {
1003                 return;
1004         }
1005
1006         /* check if the info3 must change timestamp has been set */
1007         next_change = info->pass_must_change_time;
1008
1009         if (_pam_send_password_expiry_message(ctx, next_change, now,
1010                                               warn_pwd_expire,
1011                                               already_expired,
1012                                               change_pwd)) {
1013                 return;
1014         }
1015
1016         /* now check for the global password policy */
1017         /* good catch from Ralf Haferkamp: an expiry of "never" is translated
1018          * to -1 */
1019         if ((policy->expire == (int64_t)-1) ||
1020             (policy->expire == 0)) {
1021                 return;
1022         }
1023
1024         next_change = info->pass_last_set_time + policy->expire;
1025
1026         if (_pam_send_password_expiry_message(ctx, next_change, now,
1027                                               warn_pwd_expire,
1028                                               already_expired,
1029                                               change_pwd)) {
1030                 return;
1031         }
1032
1033         /* no warning sent */
1034 }
1035
1036 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
1037
1038 /**
1039  * Append a string, making sure not to overflow and to always return a
1040  * NULL-terminated string.
1041  *
1042  * @param dest Destination string buffer (must already be NULL-terminated).
1043  * @param src Source string buffer.
1044  * @param dest_buffer_size Size of dest buffer in bytes.
1045  *
1046  * @return false if dest buffer is not big enough (no bytes copied), true on
1047  * success.
1048  */
1049
1050 static bool safe_append_string(char *dest,
1051                                const char *src,
1052                                int dest_buffer_size)
1053 {
1054         int dest_length = strlen(dest);
1055         int src_length = strlen(src);
1056
1057         if (dest_length + src_length + 1 > dest_buffer_size) {
1058                 return false;
1059         }
1060
1061         memcpy(dest + dest_length, src, src_length + 1);
1062         return true;
1063 }
1064
1065 /**
1066  * Convert a names into a SID string, appending it to a buffer.
1067  *
1068  * @param ctx PAM winbind context.
1069  * @param user User in PAM request.
1070  * @param name Name to convert.
1071  * @param sid_list_buffer Where to append the string sid.
1072  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1073  *
1074  * @return false on failure, true on success.
1075  */
1076 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
1077                                        const char *user,
1078                                        const char *name,
1079                                        char *sid_list_buffer,
1080                                        int sid_list_buffer_size)
1081 {
1082         const char* sid_string = NULL;
1083         char *sid_str = NULL;
1084
1085         /* lookup name? */
1086         if (IS_SID_STRING(name)) {
1087                 sid_string = name;
1088         } else {
1089                 wbcErr wbc_status;
1090                 struct wbcDomainSid sid;
1091                 enum wbcSidType type;
1092
1093                 _pam_log_debug(ctx, LOG_DEBUG,
1094                                "no sid given, looking up: %s\n", name);
1095
1096                 wbc_status = wbcLookupName("", name, &sid, &type);
1097                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1098                         _pam_log(ctx, LOG_INFO,
1099                                  "could not lookup name: %s\n", name);
1100                         return false;
1101                 }
1102
1103                 wbc_status = wbcSidToString(&sid, &sid_str);
1104                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1105                         return false;
1106                 }
1107
1108                 sid_string = sid_str;
1109         }
1110
1111         if (!safe_append_string(sid_list_buffer, sid_string,
1112                                 sid_list_buffer_size)) {
1113                 wbcFreeMemory(sid_str);
1114                 return false;
1115         }
1116
1117         wbcFreeMemory(sid_str);
1118         return true;
1119 }
1120
1121 /**
1122  * Convert a list of names into a list of sids.
1123  *
1124  * @param ctx PAM winbind context.
1125  * @param user User in PAM request.
1126  * @param name_list List of names or string sids, separated by commas.
1127  * @param sid_list_buffer Where to put the list of string sids.
1128  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1129  *
1130  * @return false on failure, true on success.
1131  */
1132 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1133                                                  const char *user,
1134                                                  const char *name_list,
1135                                                  char *sid_list_buffer,
1136                                                  int sid_list_buffer_size)
1137 {
1138         bool result = false;
1139         char *current_name = NULL;
1140         const char *search_location;
1141         const char *comma;
1142
1143         if (sid_list_buffer_size > 0) {
1144                 sid_list_buffer[0] = 0;
1145         }
1146
1147         search_location = name_list;
1148         while ((comma = strstr(search_location, ",")) != NULL) {
1149                 current_name = strndup(search_location,
1150                                        comma - search_location);
1151                 if (NULL == current_name) {
1152                         goto out;
1153                 }
1154
1155                 if (!winbind_name_to_sid_string(ctx, user,
1156                                                 current_name,
1157                                                 sid_list_buffer,
1158                                                 sid_list_buffer_size)) {
1159                         /*
1160                          * If one group name failed, we must not fail
1161                          * the authentication totally, continue with
1162                          * the following group names. If user belongs to
1163                          * one of the valid groups, we must allow it
1164                          * login. -- BoYang
1165                          */
1166
1167                         _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1168                                  "check if group %s is valid group.", current_name,
1169                                  current_name);
1170                         _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1171                                         "to sid, please contact your administrator to see "
1172                                         "if group %s is valid."), current_name, current_name);
1173                         SAFE_FREE(current_name);
1174                         search_location = comma + 1;
1175                         continue;
1176                 }
1177
1178                 SAFE_FREE(current_name);
1179
1180                 if (!safe_append_string(sid_list_buffer, ",",
1181                                         sid_list_buffer_size)) {
1182                         goto out;
1183                 }
1184
1185                 search_location = comma + 1;
1186         }
1187
1188         if (!winbind_name_to_sid_string(ctx, user, search_location,
1189                                         sid_list_buffer,
1190                                         sid_list_buffer_size)) {
1191                 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1192                          "check if group %s is valid group.", search_location,
1193                          search_location);
1194                 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1195                                 "to sid, please contact your administrator to see "
1196                                 "if group %s is valid."), search_location, search_location);
1197         }
1198
1199         result = true;
1200
1201 out:
1202         SAFE_FREE(current_name);
1203         return result;
1204 }
1205
1206 /**
1207  * put krb5ccname variable into environment
1208  *
1209  * @param ctx PAM winbind context.
1210  * @param krb5ccname env variable retrieved from winbindd.
1211  *
1212  * @return void.
1213  */
1214
1215 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1216                                 struct wbcLogonUserInfo *info)
1217 {
1218         char var[PATH_MAX];
1219         int ret;
1220         uint32_t i;
1221         const char *krb5ccname = NULL;
1222
1223         if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1224                 return;
1225         }
1226
1227         if (!info) {
1228                 return;
1229         }
1230
1231         for (i=0; i < info->num_blobs; i++) {
1232                 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1233                         krb5ccname = (const char *)info->blobs[i].blob.data;
1234                         break;
1235                 }
1236         }
1237
1238         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1239                 return;
1240         }
1241
1242         _pam_log_debug(ctx, LOG_DEBUG,
1243                        "request returned KRB5CCNAME: %s", krb5ccname);
1244
1245         if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
1246                 return;
1247         }
1248
1249         ret = pam_putenv(ctx->pamh, var);
1250         if (ret) {
1251                 _pam_log(ctx, LOG_ERR,
1252                          "failed to set KRB5CCNAME to %s: %s",
1253                          var, pam_strerror(ctx->pamh, ret));
1254         }
1255 }
1256
1257 /**
1258  * Copy unix username if available (further processed in PAM).
1259  *
1260  * @param ctx PAM winbind context
1261  * @param user_ret A pointer that holds a pointer to a string
1262  * @param unix_username A username
1263  *
1264  * @return void.
1265  */
1266
1267 static void _pam_setup_unix_username(struct pwb_context *ctx,
1268                                      char **user_ret,
1269                                      struct wbcLogonUserInfo *info)
1270 {
1271         const char *unix_username = NULL;
1272         uint32_t i;
1273
1274         if (!user_ret || !info) {
1275                 return;
1276         }
1277
1278         for (i=0; i < info->num_blobs; i++) {
1279                 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1280                         unix_username = (const char *)info->blobs[i].blob.data;
1281                         break;
1282                 }
1283         }
1284
1285         if (!unix_username || !unix_username[0]) {
1286                 return;
1287         }
1288
1289         *user_ret = strdup(unix_username);
1290 }
1291
1292 /**
1293  * Set string into the PAM stack.
1294  *
1295  * @param ctx PAM winbind context.
1296  * @param data_name Key name for pam_set_data.
1297  * @param value String value.
1298  *
1299  * @return void.
1300  */
1301
1302 static void _pam_set_data_string(struct pwb_context *ctx,
1303                                  const char *data_name,
1304                                  const char *value)
1305 {
1306         int ret;
1307
1308         if (!data_name || !value || (strlen(data_name) == 0) ||
1309              (strlen(value) == 0)) {
1310                 return;
1311         }
1312
1313         ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1314                            _pam_winbind_cleanup_func);
1315         if (ret) {
1316                 _pam_log_debug(ctx, LOG_DEBUG,
1317                                "Could not set data %s: %s\n",
1318                                data_name, pam_strerror(ctx->pamh, ret));
1319         }
1320 }
1321
1322 /**
1323  * Set info3 strings into the PAM stack.
1324  *
1325  * @param ctx PAM winbind context.
1326  * @param data_name Key name for pam_set_data.
1327  * @param value String value.
1328  *
1329  * @return void.
1330  */
1331
1332 static void _pam_set_data_info3(struct pwb_context *ctx,
1333                                 const struct wbcAuthUserInfo *info)
1334 {
1335         _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1336                              info->home_directory);
1337         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1338                              info->logon_script);
1339         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1340                              info->logon_server);
1341         _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1342                              info->profile_path);
1343 }
1344
1345 /**
1346  * Free info3 strings in the PAM stack.
1347  *
1348  * @param pamh PAM handle
1349  *
1350  * @return void.
1351  */
1352
1353 static void _pam_free_data_info3(pam_handle_t *pamh)
1354 {
1355         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1356         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1357         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1358         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1359 }
1360
1361 /**
1362  * Send PAM_ERROR_MSG for cached or grace logons.
1363  *
1364  * @param ctx PAM winbind context.
1365  * @param username User in PAM request.
1366  * @param info3_user_flgs Info3 flags containing logon type bits.
1367  *
1368  * @return void.
1369  */
1370
1371 static void _pam_warn_logon_type(struct pwb_context *ctx,
1372                                  const char *username,
1373                                  uint32_t info3_user_flgs)
1374 {
1375         /* inform about logon type */
1376         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1377
1378                 _make_remark(ctx, PAM_ERROR_MSG,
1379                              _("Grace login. "
1380                                "Please change your password as soon you're "
1381                                "online again"));
1382                 _pam_log_debug(ctx, LOG_DEBUG,
1383                                "User %s logged on using grace logon\n",
1384                                username);
1385
1386         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1387
1388                 _make_remark(ctx, PAM_ERROR_MSG,
1389                              _("Domain Controller unreachable, "
1390                                "using cached credentials instead. "
1391                                "Network resources may be unavailable"));
1392                 _pam_log_debug(ctx, LOG_DEBUG,
1393                                "User %s logged on using cached credentials\n",
1394                                username);
1395         }
1396 }
1397
1398 /**
1399  * Send PAM_ERROR_MSG for krb5 errors.
1400  *
1401  * @param ctx PAM winbind context.
1402  * @param username User in PAM request.
1403  * @param info3_user_flgs Info3 flags containing logon type bits.
1404  *
1405  * @return void.
1406  */
1407
1408 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1409                                    const char *username,
1410                                    uint32_t info3_user_flgs)
1411 {
1412         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1413                 _make_remark(ctx, PAM_ERROR_MSG,
1414                              _("Failed to establish your Kerberos Ticket cache "
1415                                "due time differences\n"
1416                                "with the domain controller.  "
1417                                "Please verify the system time.\n"));
1418                 _pam_log_debug(ctx, LOG_DEBUG,
1419                                "User %s: Clock skew when getting Krb5 TGT\n",
1420                                username);
1421         }
1422 }
1423
1424 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1425                                        const struct wbcAuthErrorInfo *e,
1426                                        const char *nt_status_string,
1427                                        int *pam_error)
1428 {
1429         const char *ntstatus = NULL;
1430         const char *error_string = NULL;
1431
1432         if (!e || !pam_error) {
1433                 return false;
1434         }
1435
1436         ntstatus = e->nt_string;
1437         if (!ntstatus) {
1438                 return false;
1439         }
1440
1441         if (strcasecmp(ntstatus, nt_status_string) == 0) {
1442
1443                 error_string = _get_ntstatus_error_string(nt_status_string);
1444                 if (error_string) {
1445                         _make_remark(ctx, PAM_ERROR_MSG, error_string);
1446                         *pam_error = e->pam_error;
1447                         return true;
1448                 }
1449
1450                 if (e->display_string) {
1451                         _make_remark(ctx, PAM_ERROR_MSG, e->display_string);
1452                         *pam_error = e->pam_error;
1453                         return true;
1454                 }
1455
1456                 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1457                 *pam_error = e->pam_error;
1458
1459                 return true;
1460         }
1461
1462         return false;
1463 };
1464
1465 /**
1466  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1467  *
1468  * @param i The wbcUserPasswordPolicyInfo struct.
1469  *
1470  * @return string (caller needs to talloc_free).
1471  */
1472
1473 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1474                                                  struct wbcUserPasswordPolicyInfo *i)
1475 {
1476         char *str = NULL;
1477
1478         if (!i) {
1479                 goto failed;
1480         }
1481
1482         str = talloc_asprintf(ctx, _("Your password "));
1483         if (!str) {
1484                 goto failed;
1485         }
1486
1487         if (i->min_length_password > 0) {
1488                 str = talloc_asprintf_append(str,
1489                                _("must be at least %d characters; "),
1490                                i->min_length_password);
1491                 if (!str) {
1492                         goto failed;
1493                 }
1494         }
1495
1496         if (i->password_history > 0) {
1497                 str = talloc_asprintf_append(str,
1498                                _("cannot repeat any of your previous %d "
1499                                 "passwords; "),
1500                                i->password_history);
1501                 if (!str) {
1502                         goto failed;
1503                 }
1504         }
1505
1506         if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1507                 str = talloc_asprintf_append(str,
1508                                _("must contain capitals, numerals "
1509                                  "or punctuation; "
1510                                  "and cannot contain your account "
1511                                  "or full name; "));
1512                 if (!str) {
1513                         goto failed;
1514                 }
1515         }
1516
1517         str = talloc_asprintf_append(str,
1518                        _("Please type a different password. "
1519                          "Type a password which meets these requirements in "
1520                          "both text boxes."));
1521         if (!str) {
1522                 goto failed;
1523         }
1524
1525         return str;
1526
1527  failed:
1528         TALLOC_FREE(str);
1529         return NULL;
1530 }
1531
1532 static int _pam_create_homedir(struct pwb_context *ctx,
1533                                const char *dirname,
1534                                mode_t mode)
1535 {
1536         struct stat sbuf;
1537
1538         if (stat(dirname, &sbuf) == 0) {
1539                 return PAM_SUCCESS;
1540         }
1541
1542         if (mkdir(dirname, mode) != 0) {
1543
1544                 _make_remark_format(ctx, PAM_TEXT_INFO,
1545                                     _("Creating directory: %s failed: %s"),
1546                                     dirname, strerror(errno));
1547                 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1548                  dirname, strerror(errno));
1549                  return PAM_PERM_DENIED;
1550         }
1551
1552         return PAM_SUCCESS;
1553 }
1554
1555 static int _pam_chown_homedir(struct pwb_context *ctx,
1556                               const char *dirname,
1557                               uid_t uid,
1558                               gid_t gid)
1559 {
1560         if (chown(dirname, uid, gid) != 0) {
1561                 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1562                          dirname, strerror(errno));
1563                 return PAM_PERM_DENIED;
1564         }
1565
1566         return PAM_SUCCESS;
1567 }
1568
1569 static int _pam_mkhomedir(struct pwb_context *ctx)
1570 {
1571         struct passwd *pwd = NULL;
1572         char *token = NULL;
1573         char *create_dir = NULL;
1574         char *user_dir = NULL;
1575         int ret;
1576         const char *username;
1577         mode_t mode = 0700;
1578         char *safe_ptr = NULL;
1579         char *p = NULL;
1580
1581         /* Get the username */
1582         ret = pam_get_user(ctx->pamh, &username, NULL);
1583         if ((ret != PAM_SUCCESS) || (!username)) {
1584                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1585                 return PAM_SERVICE_ERR;
1586         }
1587
1588         pwd = getpwnam(username);
1589         if (pwd == NULL) {
1590                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1591                 return PAM_USER_UNKNOWN;
1592         }
1593         _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1594
1595         ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1596         if (ret == PAM_SUCCESS) {
1597                 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1598                                          pwd->pw_uid,
1599                                          pwd->pw_gid);
1600         }
1601
1602         if (ret == PAM_SUCCESS) {
1603                 return ret;
1604         }
1605
1606         /* maybe we need to create parent dirs */
1607         create_dir = talloc_strdup(ctx, "/");
1608         if (!create_dir) {
1609                 return PAM_BUF_ERR;
1610         }
1611
1612         /* find final directory */
1613         user_dir = strrchr(pwd->pw_dir, '/');
1614         if (!user_dir) {
1615                 return PAM_BUF_ERR;
1616         }
1617         user_dir++;
1618
1619         _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1620
1621         p = pwd->pw_dir;
1622
1623         while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1624
1625                 mode = 0755;
1626
1627                 p = NULL;
1628
1629                 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1630
1631                 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1632                 if (!create_dir) {
1633                         return PAM_BUF_ERR;
1634                 }
1635                 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1636
1637                 if (strcmp(token, user_dir) == 0) {
1638                         _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1639                         mode = 0700;
1640                 }
1641
1642                 ret = _pam_create_homedir(ctx, create_dir, mode);
1643                 if (ret) {
1644                         return ret;
1645                 }
1646         }
1647
1648         return _pam_chown_homedir(ctx, create_dir,
1649                                   pwd->pw_uid,
1650                                   pwd->pw_gid);
1651 }
1652
1653 /* talk to winbindd */
1654 static int winbind_auth_request(struct pwb_context *ctx,
1655                                 const char *user,
1656                                 const char *pass,
1657                                 const char *member,
1658                                 const char *cctype,
1659                                 const int warn_pwd_expire,
1660                                 struct wbcAuthErrorInfo **p_error,
1661                                 struct wbcLogonUserInfo **p_info,
1662                                 struct wbcUserPasswordPolicyInfo **p_policy,
1663                                 time_t *pwd_last_set,
1664                                 char **user_ret)
1665 {
1666         wbcErr wbc_status;
1667
1668         struct wbcLogonUserParams logon;
1669         char membership_of[1024];
1670         uid_t user_uid = -1;
1671         uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1672                          WBFLAG_PAM_GET_PWD_POLICY;
1673
1674         struct wbcLogonUserInfo *info = NULL;
1675         struct wbcAuthUserInfo *user_info = NULL;
1676         struct wbcAuthErrorInfo *error = NULL;
1677         struct wbcUserPasswordPolicyInfo *policy = NULL;
1678
1679         int ret = PAM_AUTH_ERR;
1680         int i;
1681         const char *codes[] = {
1682                 "NT_STATUS_PASSWORD_EXPIRED",
1683                 "NT_STATUS_PASSWORD_MUST_CHANGE",
1684                 "NT_STATUS_INVALID_WORKSTATION",
1685                 "NT_STATUS_INVALID_LOGON_HOURS",
1686                 "NT_STATUS_ACCOUNT_EXPIRED",
1687                 "NT_STATUS_ACCOUNT_DISABLED",
1688                 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1689                 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1690                 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1691                 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1692                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1693                 "NT_STATUS_NO_LOGON_SERVERS",
1694                 "NT_STATUS_WRONG_PASSWORD",
1695                 "NT_STATUS_ACCESS_DENIED"
1696         };
1697
1698         if (pwd_last_set) {
1699                 *pwd_last_set = 0;
1700         }
1701
1702         /* Krb5 auth always has to go against the KDC of the user's realm */
1703
1704         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1705                 flags           |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1706         }
1707
1708         if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1709                 struct passwd *pwd = NULL;
1710
1711                 pwd = getpwnam(user);
1712                 if (pwd == NULL) {
1713                         return PAM_USER_UNKNOWN;
1714                 }
1715                 user_uid        = pwd->pw_uid;
1716         }
1717
1718         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1719
1720                 _pam_log_debug(ctx, LOG_DEBUG,
1721                                "enabling krb5 login flag\n");
1722
1723                 flags           |= WBFLAG_PAM_KRB5 |
1724                                    WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1725         }
1726
1727         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1728                 _pam_log_debug(ctx, LOG_DEBUG,
1729                                "enabling cached login flag\n");
1730                 flags           |= WBFLAG_PAM_CACHED_LOGIN;
1731         }
1732
1733         if (user_ret) {
1734                 *user_ret = NULL;
1735                 flags           |= WBFLAG_PAM_UNIX_NAME;
1736         }
1737
1738         if (cctype != NULL) {
1739                 _pam_log_debug(ctx, LOG_DEBUG,
1740                                "enabling request for a %s krb5 ccache\n",
1741                                cctype);
1742         }
1743
1744         if (member != NULL) {
1745
1746                 ZERO_STRUCT(membership_of);
1747
1748                 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1749                                                           membership_of,
1750                                                           sizeof(membership_of))) {
1751                         _pam_log_debug(ctx, LOG_ERR,
1752                                        "failed to serialize membership of sid "
1753                                        "\"%s\"\n", member);
1754                         return PAM_AUTH_ERR;
1755                 }
1756         }
1757
1758         ZERO_STRUCT(logon);
1759
1760         logon.username                  = user;
1761         logon.password                  = pass;
1762
1763         if (cctype) {
1764                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1765                                              &logon.blobs,
1766                                              "krb5_cc_type",
1767                                              0,
1768                                              (uint8_t *)cctype,
1769                                              strlen(cctype)+1);
1770                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1771                         goto done;
1772                 }
1773         }
1774
1775         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1776                                      &logon.blobs,
1777                                      "flags",
1778                                      0,
1779                                      (uint8_t *)&flags,
1780                                      sizeof(flags));
1781         if (!WBC_ERROR_IS_OK(wbc_status)) {
1782                 goto done;
1783         }
1784
1785         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1786                                      &logon.blobs,
1787                                      "user_uid",
1788                                      0,
1789                                      (uint8_t *)&user_uid,
1790                                      sizeof(user_uid));
1791         if (!WBC_ERROR_IS_OK(wbc_status)) {
1792                 goto done;
1793         }
1794
1795         if (member) {
1796                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1797                                              &logon.blobs,
1798                                              "membership_of",
1799                                              0,
1800                                              (uint8_t *)membership_of,
1801                                              sizeof(membership_of));
1802                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1803                         goto done;
1804                 }
1805         }
1806
1807         wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1808         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1809                                           user, "wbcLogonUser");
1810         wbcFreeMemory(logon.blobs);
1811         logon.blobs = NULL;
1812
1813         if (info && info->info) {
1814                 user_info = info->info;
1815         }
1816
1817         if (pwd_last_set && user_info) {
1818                 *pwd_last_set = user_info->pass_last_set_time;
1819         }
1820
1821         if (p_info && info) {
1822                 *p_info = info;
1823         }
1824
1825         if (p_policy && policy) {
1826                 *p_policy = policy;
1827         }
1828
1829         if (p_error && error) {
1830                 /* We want to process the error in the caller. */
1831                 *p_error = error;
1832                 return ret;
1833         }
1834
1835         for (i=0; i<ARRAY_SIZE(codes); i++) {
1836                 int _ret = ret;
1837                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1838                         ret = _ret;
1839                         goto done;
1840                 }
1841         }
1842
1843         if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1844
1845                 bool already_expired = false;
1846                 bool change_pwd = false;
1847
1848                 /* warn a user if the password is about to expire soon */
1849                 _pam_warn_password_expiry(ctx, user_info, policy,
1850                                           warn_pwd_expire,
1851                                           &already_expired,
1852                                           &change_pwd);
1853
1854                 if (already_expired == true) {
1855
1856                         SMB_TIME_T last_set = user_info->pass_last_set_time;
1857
1858                         _pam_log_debug(ctx, LOG_DEBUG,
1859                                        "Password has expired "
1860                                        "(Password was last set: %lld, "
1861                                        "the policy says it should expire here "
1862                                        "%lld (now it's: %ld))\n",
1863                                        (long long int)last_set,
1864                                        (long long int)last_set +
1865                                        policy->expire,
1866                                        (long)time(NULL));
1867
1868                         return PAM_AUTHTOK_EXPIRED;
1869                 }
1870
1871                 if (change_pwd) {
1872                         ret = PAM_NEW_AUTHTOK_REQD;
1873                         goto done;
1874                 }
1875
1876                 /* inform about logon type */
1877                 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1878
1879                 /* inform about krb5 failures */
1880                 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1881
1882                 /* set some info3 info for other modules in the stack */
1883                 _pam_set_data_info3(ctx, user_info);
1884
1885                 /* put krb5ccname into env */
1886                 _pam_setup_krb5_env(ctx, info);
1887
1888                 /* If winbindd returned a username, return the pointer to it
1889                  * here. */
1890                 _pam_setup_unix_username(ctx, user_ret, info);
1891         }
1892
1893  done:
1894         if (logon.blobs) {
1895                 wbcFreeMemory(logon.blobs);
1896         }
1897         if (info && info->blobs && !p_info) {
1898                 wbcFreeMemory(info->blobs);
1899         }
1900         if (error && !p_error) {
1901                 wbcFreeMemory(error);
1902         }
1903         if (info && !p_info) {
1904                 wbcFreeMemory(info);
1905         }
1906         if (policy && !p_policy) {
1907                 wbcFreeMemory(policy);
1908         }
1909
1910         return ret;
1911 }
1912
1913 /* talk to winbindd */
1914 static int winbind_chauthtok_request(struct pwb_context *ctx,
1915                                      const char *user,
1916                                      const char *oldpass,
1917                                      const char *newpass,
1918                                      time_t pwd_last_set)
1919 {
1920         wbcErr wbc_status;
1921         struct wbcChangePasswordParams params;
1922         struct wbcAuthErrorInfo *error = NULL;
1923         struct wbcUserPasswordPolicyInfo *policy = NULL;
1924         enum wbcPasswordChangeRejectReason reject_reason = -1;
1925         uint32_t flags = 0;
1926
1927         int i;
1928         const char *codes[] = {
1929                 "NT_STATUS_BACKUP_CONTROLLER",
1930                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1931                 "NT_STATUS_NO_LOGON_SERVERS",
1932                 "NT_STATUS_ACCESS_DENIED",
1933                 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1934                 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1935                 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1936         };
1937         int ret = PAM_AUTH_ERR;
1938
1939         ZERO_STRUCT(params);
1940
1941         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1942                 flags |= WBFLAG_PAM_KRB5 |
1943                          WBFLAG_PAM_CONTACT_TRUSTDOM;
1944         }
1945
1946         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1947                 flags |= WBFLAG_PAM_CACHED_LOGIN;
1948         }
1949
1950         params.account_name             = user;
1951         params.level                    = WBC_AUTH_USER_LEVEL_PLAIN;
1952         params.old_password.plaintext   = oldpass;
1953         params.new_password.plaintext   = newpass;
1954         params.flags                    = flags;
1955
1956         wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1957         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1958                                           user, "wbcChangeUserPasswordEx");
1959
1960         if (WBC_ERROR_IS_OK(wbc_status)) {
1961                 _pam_log(ctx, LOG_NOTICE,
1962                          "user '%s' password changed", user);
1963                 return PAM_SUCCESS;
1964         }
1965
1966         if (!error) {
1967                 wbcFreeMemory(policy);
1968                 return ret;
1969         }
1970
1971         for (i=0; i<ARRAY_SIZE(codes); i++) {
1972                 int _ret = ret;
1973                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1974                         ret = _ret;
1975                         goto done;
1976                 }
1977         }
1978
1979         if (!strcasecmp(error->nt_string,
1980                         "NT_STATUS_PASSWORD_RESTRICTION")) {
1981
1982                 char *pwd_restriction_string = NULL;
1983                 SMB_TIME_T min_pwd_age = 0;
1984
1985                 if (policy) {
1986                         min_pwd_age     = policy->min_passwordage;
1987                 }
1988
1989                 /* FIXME: avoid to send multiple PAM messages after another */
1990                 switch (reject_reason) {
1991                         case -1:
1992                                 break;
1993                         case WBC_PWD_CHANGE_NO_ERROR:
1994                                 if ((min_pwd_age > 0) &&
1995                                     (pwd_last_set + min_pwd_age > time(NULL))) {
1996                                         PAM_WB_REMARK_DIRECT(ctx,
1997                                              "NT_STATUS_PWD_TOO_RECENT");
1998                                 }
1999                                 break;
2000                         case WBC_PWD_CHANGE_PASSWORD_TOO_SHORT:
2001                                 PAM_WB_REMARK_DIRECT(ctx,
2002                                         "NT_STATUS_PWD_TOO_SHORT");
2003                                 break;
2004                         case WBC_PWD_CHANGE_PWD_IN_HISTORY:
2005                                 PAM_WB_REMARK_DIRECT(ctx,
2006                                         "NT_STATUS_PWD_HISTORY_CONFLICT");
2007                                 break;
2008                         case WBC_PWD_CHANGE_NOT_COMPLEX:
2009                                 _make_remark(ctx, PAM_ERROR_MSG,
2010                                              _("Password does not meet "
2011                                                "complexity requirements"));
2012                                 break;
2013                         default:
2014                                 _pam_log_debug(ctx, LOG_DEBUG,
2015                                                "unknown password change "
2016                                                "reject reason: %d",
2017                                                reject_reason);
2018                                 break;
2019                 }
2020
2021                 pwd_restriction_string =
2022                         _pam_compose_pwd_restriction_string(ctx, policy);
2023                 if (pwd_restriction_string) {
2024                         _make_remark(ctx, PAM_ERROR_MSG,
2025                                      pwd_restriction_string);
2026                         TALLOC_FREE(pwd_restriction_string);
2027                 }
2028         }
2029  done:
2030         wbcFreeMemory(error);
2031         wbcFreeMemory(policy);
2032
2033         return ret;
2034 }
2035
2036 /*
2037  * Checks if a user has an account
2038  *
2039  * return values:
2040  *       1  = User not found
2041  *       0  = OK
2042  *      -1  = System error
2043  */
2044 static int valid_user(struct pwb_context *ctx,
2045                       const char *user)
2046 {
2047         /* check not only if the user is available over NSS calls, also make
2048          * sure it's really a winbind user, this is important when stacking PAM
2049          * modules in the 'account' or 'password' facility. */
2050
2051         wbcErr wbc_status;
2052         struct passwd *pwd = NULL;
2053         struct passwd *wb_pwd = NULL;
2054
2055         pwd = getpwnam(user);
2056         if (pwd == NULL) {
2057                 return 1;
2058         }
2059
2060         wbc_status = wbcGetpwnam(user, &wb_pwd);
2061         wbcFreeMemory(wb_pwd);
2062         if (!WBC_ERROR_IS_OK(wbc_status)) {
2063                 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
2064                         wbcErrorString(wbc_status));
2065         }
2066
2067         switch (wbc_status) {
2068                 case WBC_ERR_UNKNOWN_USER:
2069                         return 1;
2070                 case WBC_ERR_SUCCESS:
2071                         return 0;
2072                 default:
2073                         break;
2074         }
2075         return -1;
2076 }
2077
2078 static char *_pam_delete(register char *xx)
2079 {
2080         _pam_overwrite(xx);
2081         _pam_drop(xx);
2082         return NULL;
2083 }
2084
2085 /*
2086  * obtain a password from the user
2087  */
2088
2089 static int _winbind_read_password(struct pwb_context *ctx,
2090                                   unsigned int ctrl,
2091                                   const char *comment,
2092                                   const char *prompt1,
2093                                   const char *prompt2,
2094                                   const char **pass)
2095 {
2096         int authtok_flag;
2097         int retval;
2098         const char *item;
2099         char *token;
2100
2101         _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2102
2103         /*
2104          * make sure nothing inappropriate gets returned
2105          */
2106
2107         *pass = token = NULL;
2108
2109         /*
2110          * which authentication token are we getting?
2111          */
2112
2113         if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2114                 authtok_flag = PAM_OLDAUTHTOK;
2115         } else {
2116                 authtok_flag = PAM_AUTHTOK;
2117         }
2118
2119         /*
2120          * should we obtain the password from a PAM item ?
2121          */
2122
2123         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2124             on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2125                 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
2126                 if (retval != PAM_SUCCESS) {
2127                         /* very strange. */
2128                         _pam_log(ctx, LOG_ALERT,
2129                                  "pam_get_item returned error "
2130                                  "to unix-read-password");
2131                         return retval;
2132                 } else if (item != NULL) {      /* we have a password! */
2133                         *pass = item;
2134                         item = NULL;
2135                         _pam_log(ctx, LOG_DEBUG,
2136                                  "pam_get_item returned a password");
2137                         return PAM_SUCCESS;
2138                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2139                         return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2140                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2141                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
2142                         return PAM_AUTHTOK_RECOVER_ERR;
2143                 }
2144         }
2145         /*
2146          * getting here implies we will have to get the password from the
2147          * user directly.
2148          */
2149
2150         {
2151                 struct pam_message msg[3], *pmsg[3];
2152                 struct pam_response *resp;
2153                 int i, replies;
2154
2155                 /* prepare to converse */
2156
2157                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2158                         pmsg[0] = &msg[0];
2159                         msg[0].msg_style = PAM_TEXT_INFO;
2160                         msg[0].msg = discard_const_p(char, comment);
2161                         i = 1;
2162                 } else {
2163                         i = 0;
2164                 }
2165
2166                 pmsg[i] = &msg[i];
2167                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2168                 msg[i++].msg = discard_const_p(char, prompt1);
2169                 replies = 1;
2170
2171                 if (prompt2 != NULL) {
2172                         pmsg[i] = &msg[i];
2173                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2174                         msg[i++].msg = discard_const_p(char, prompt2);
2175                         ++replies;
2176                 }
2177                 /* so call the conversation expecting i responses */
2178                 resp = NULL;
2179                 retval = converse(ctx->pamh, i, pmsg, &resp);
2180                 if (resp == NULL) {
2181                         if (retval == PAM_SUCCESS) {
2182                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2183                         }
2184                         goto done;
2185                 }
2186                 if (retval != PAM_SUCCESS) {
2187                         _pam_drop_reply(resp, i);
2188                         goto done;
2189                 }
2190
2191                 /* interpret the response */
2192
2193                 token = x_strdup(resp[i - replies].resp);
2194                 if (!token) {
2195                         _pam_log(ctx, LOG_NOTICE,
2196                                  "could not recover "
2197                                  "authentication token");
2198                         retval = PAM_AUTHTOK_RECOVER_ERR;
2199                         goto done;
2200                 }
2201
2202                 if (replies == 2) {
2203                         /* verify that password entered correctly */
2204                         if (!resp[i - 1].resp ||
2205                             strcmp(token, resp[i - 1].resp)) {
2206                                 _pam_delete(token);     /* mistyped */
2207                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2208                                 _make_remark(ctx, PAM_ERROR_MSG,
2209                                              MISTYPED_PASS);
2210                         }
2211                 }
2212
2213                 /*
2214                  * tidy up the conversation (resp_retcode) is ignored
2215                  * -- what is it for anyway? AGM
2216                  */
2217                 _pam_drop_reply(resp, i);
2218         }
2219
2220  done:
2221         if (retval != PAM_SUCCESS) {
2222                 _pam_log_debug(ctx, LOG_DEBUG,
2223                                "unable to obtain a password");
2224                 return retval;
2225         }
2226         /* 'token' is the entered password */
2227
2228         /* we store this password as an item */
2229
2230         retval = pam_set_item(ctx->pamh, authtok_flag, token);
2231         _pam_delete(token);     /* clean it up */
2232         if (retval != PAM_SUCCESS ||
2233             (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
2234
2235                 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2236                 return retval;
2237
2238         }
2239
2240         *pass = item;
2241         item = NULL;            /* break link to password */
2242
2243         return PAM_SUCCESS;
2244 }
2245
2246 static const char *get_conf_item_string(struct pwb_context *ctx,
2247                                         const char *item,
2248                                         int config_flag)
2249 {
2250         int i = 0;
2251         const char *parm_opt = NULL;
2252
2253         if (!(ctx->ctrl & config_flag)) {
2254                 goto out;
2255         }
2256
2257         /* let the pam opt take precedence over the pam_winbind.conf option */
2258         for (i=0; i<ctx->argc; i++) {
2259
2260                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2261                         char *p;
2262
2263                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2264                                 _pam_log(ctx, LOG_INFO,
2265                                          "no \"=\" delimiter for \"%s\" found\n",
2266                                          item);
2267                                 goto out;
2268                         }
2269                         _pam_log_debug(ctx, LOG_INFO,
2270                                        "PAM config: %s '%s'\n", item, p+1);
2271                         return p + 1;
2272                 }
2273         }
2274
2275         if (ctx->dict) {
2276                 char *key = NULL;
2277
2278                 key = talloc_asprintf(ctx, "global:%s", item);
2279                 if (!key) {
2280                         goto out;
2281                 }
2282
2283                 parm_opt = iniparser_getstr(ctx->dict, key);
2284                 TALLOC_FREE(key);
2285
2286                 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2287                                item, parm_opt);
2288         }
2289 out:
2290         return parm_opt;
2291 }
2292
2293 static int get_config_item_int(struct pwb_context *ctx,
2294                                const char *item,
2295                                int config_flag)
2296 {
2297         int i, parm_opt = -1;
2298
2299         if (!(ctx->ctrl & config_flag)) {
2300                 goto out;
2301         }
2302
2303         /* let the pam opt take precedence over the pam_winbind.conf option */
2304         for (i = 0; i < ctx->argc; i++) {
2305
2306                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2307                         char *p;
2308
2309                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2310                                 _pam_log(ctx, LOG_INFO,
2311                                          "no \"=\" delimiter for \"%s\" found\n",
2312                                          item);
2313                                 goto out;
2314                         }
2315                         parm_opt = atoi(p + 1);
2316                         _pam_log_debug(ctx, LOG_INFO,
2317                                        "PAM config: %s '%d'\n",
2318                                        item, parm_opt);
2319                         return parm_opt;
2320                 }
2321         }
2322
2323         if (ctx->dict) {
2324                 char *key = NULL;
2325
2326                 key = talloc_asprintf(ctx, "global:%s", item);
2327                 if (!key) {
2328                         goto out;
2329                 }
2330
2331                 parm_opt = iniparser_getint(ctx->dict, key, -1);
2332                 TALLOC_FREE(key);
2333
2334                 _pam_log_debug(ctx, LOG_INFO,
2335                                "CONFIG file: %s '%d'\n",
2336                                item, parm_opt);
2337         }
2338 out:
2339         return parm_opt;
2340 }
2341
2342 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2343 {
2344         return get_conf_item_string(ctx, "krb5_ccache_type",
2345                                     WINBIND_KRB5_CCACHE_TYPE);
2346 }
2347
2348 static const char *get_member_from_config(struct pwb_context *ctx)
2349 {
2350         const char *ret = NULL;
2351         ret = get_conf_item_string(ctx, "require_membership_of",
2352                                    WINBIND_REQUIRED_MEMBERSHIP);
2353         if (ret) {
2354                 return ret;
2355         }
2356         return get_conf_item_string(ctx, "require-membership-of",
2357                                     WINBIND_REQUIRED_MEMBERSHIP);
2358 }
2359
2360 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2361 {
2362         int ret;
2363         ret = get_config_item_int(ctx, "warn_pwd_expire",
2364                                   WINBIND_WARN_PWD_EXPIRE);
2365         /* no or broken setting */
2366         if (ret <= 0) {
2367                 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2368         }
2369         return ret;
2370 }
2371
2372 /**
2373  * Retrieve the winbind separator.
2374  *
2375  * @param ctx PAM winbind context.
2376  *
2377  * @return string separator character. NULL on failure.
2378  */
2379
2380 static char winbind_get_separator(struct pwb_context *ctx)
2381 {
2382         wbcErr wbc_status;
2383         static struct wbcInterfaceDetails *details = NULL;
2384
2385         wbc_status = wbcInterfaceDetails(&details);
2386         if (!WBC_ERROR_IS_OK(wbc_status)) {
2387                 _pam_log(ctx, LOG_ERR,
2388                          "Could not retrieve winbind interface details: %s",
2389                          wbcErrorString(wbc_status));
2390                 return '\0';
2391         }
2392
2393         if (!details) {
2394                 return '\0';
2395         }
2396
2397         return details->winbind_separator;
2398 }
2399
2400
2401 /**
2402  * Convert a upn to a name.
2403  *
2404  * @param ctx PAM winbind context.
2405  * @param upn  USer UPN to be trabslated.
2406  *
2407  * @return converted name. NULL pointer on failure. Caller needs to free.
2408  */
2409
2410 static char* winbind_upn_to_username(struct pwb_context *ctx,
2411                                      const char *upn)
2412 {
2413         char sep;
2414         wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2415         struct wbcDomainSid sid;
2416         enum wbcSidType type;
2417         char *domain;
2418         char *name;
2419         char *p;
2420
2421         /* This cannot work when the winbind separator = @ */
2422
2423         sep = winbind_get_separator(ctx);
2424         if (!sep || sep == '@') {
2425                 return NULL;
2426         }
2427
2428         name = talloc_strdup(ctx, upn);
2429         if (!name) {
2430                 return NULL;
2431         }
2432         if ((p = strchr(name, '@')) != NULL) {
2433                 *p = 0;
2434                 domain = p + 1;
2435         }
2436
2437         /* Convert the UPN to a SID */
2438
2439         wbc_status = wbcLookupName(domain, name, &sid, &type);
2440         if (!WBC_ERROR_IS_OK(wbc_status)) {
2441                 return NULL;
2442         }
2443
2444         /* Convert the the SID back to the sAMAccountName */
2445
2446         wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2447         if (!WBC_ERROR_IS_OK(wbc_status)) {
2448                 return NULL;
2449         }
2450
2451         return talloc_asprintf(ctx, "%s\\%s", domain, name);
2452 }
2453
2454 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2455                          int argc, const char **argv)
2456 {
2457         int retval = PAM_SUCCESS;
2458         struct pwb_context *ctx = NULL;
2459         struct wbcLogoffUserParams logoff;
2460         struct wbcAuthErrorInfo *error = NULL;
2461         const char *user;
2462         wbcErr wbc_status = WBC_ERR_SUCCESS;
2463
2464         ZERO_STRUCT(logoff);
2465
2466         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2467         if (retval) {
2468                 goto out;
2469         }
2470
2471         _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2472
2473         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2474
2475                 /* destroy the ccache here */
2476
2477                 uint32_t wbc_flags = 0;
2478                 const char *ccname = NULL;
2479                 struct passwd *pwd = NULL;
2480
2481                 retval = pam_get_user(pamh, &user, _("Username: "));
2482                 if (retval) {
2483                         _pam_log(ctx, LOG_ERR,
2484                                  "could not identify user");
2485                         goto out;
2486                 }
2487
2488                 if (user == NULL) {
2489                         _pam_log(ctx, LOG_ERR,
2490                                  "username was NULL!");
2491                         retval = PAM_USER_UNKNOWN;
2492                         goto out;
2493                 }
2494
2495                 _pam_log_debug(ctx, LOG_DEBUG,
2496                                "username [%s] obtained", user);
2497
2498                 ccname = pam_getenv(pamh, "KRB5CCNAME");
2499                 if (ccname == NULL) {
2500                         _pam_log_debug(ctx, LOG_DEBUG,
2501                                        "user has no KRB5CCNAME environment");
2502                 }
2503
2504                 pwd = getpwnam(user);
2505                 if (pwd == NULL) {
2506                         retval = PAM_USER_UNKNOWN;
2507                         goto out;
2508                 }
2509
2510                 wbc_flags = WBFLAG_PAM_KRB5 |
2511                         WBFLAG_PAM_CONTACT_TRUSTDOM;
2512
2513                 logoff.username         = user;
2514
2515                 if (ccname) {
2516                         wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2517                                                      &logoff.blobs,
2518                                                      "ccfilename",
2519                                                      0,
2520                                                      (uint8_t *)ccname,
2521                                                      strlen(ccname)+1);
2522                         if (!WBC_ERROR_IS_OK(wbc_status)) {
2523                                 goto out;
2524                         }
2525                 }
2526
2527                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2528                                              &logoff.blobs,
2529                                              "flags",
2530                                              0,
2531                                              (uint8_t *)&wbc_flags,
2532                                              sizeof(wbc_flags));
2533                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2534                         goto out;
2535                 }
2536
2537                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2538                                              &logoff.blobs,
2539                                              "user_uid",
2540                                              0,
2541                                              (uint8_t *)&pwd->pw_uid,
2542                                              sizeof(pwd->pw_uid));
2543                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2544                         goto out;
2545                 }
2546
2547                 wbc_status = wbcLogoffUserEx(&logoff, &error);
2548                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2549                                                      user, "wbcLogoffUser");
2550                 wbcFreeMemory(error);
2551                 wbcFreeMemory(logoff.blobs);
2552                 logoff.blobs = NULL;
2553
2554                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2555                         _pam_log(ctx, LOG_INFO,
2556                                  "failed to logoff user %s: %s\n",
2557                                          user, wbcErrorString(wbc_status));
2558                 }
2559         }
2560
2561 out:
2562         if (logoff.blobs) {
2563                 wbcFreeMemory(logoff.blobs);
2564         }
2565
2566         if (!WBC_ERROR_IS_OK(wbc_status)) {
2567                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2568                      user, "wbcLogoffUser");
2569         }
2570
2571         /*
2572          * Delete the krb5 ccname variable from the PAM environment
2573          * if it was set by winbind.
2574          */
2575         if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2576                 pam_putenv(pamh, "KRB5CCNAME");
2577         }
2578
2579         _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2580
2581         TALLOC_FREE(ctx);
2582
2583         return retval;
2584 }
2585
2586 PAM_EXTERN
2587 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2588                         int argc, const char **argv)
2589 {
2590         const char *username;
2591         const char *password;
2592         const char *member = NULL;
2593         const char *cctype = NULL;
2594         int warn_pwd_expire;
2595         int retval = PAM_AUTH_ERR;
2596         char *username_ret = NULL;
2597         char *new_authtok_required = NULL;
2598         char *real_username = NULL;
2599         struct pwb_context *ctx = NULL;
2600
2601         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2602         if (retval) {
2603                 goto out;
2604         }
2605
2606         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2607
2608         /* Get the username */
2609         retval = pam_get_user(pamh, &username, NULL);
2610         if ((retval != PAM_SUCCESS) || (!username)) {
2611                 _pam_log_debug(ctx, LOG_DEBUG,
2612                                "can not get the username");
2613                 retval = PAM_SERVICE_ERR;
2614                 goto out;
2615         }
2616
2617
2618 #if defined(AIX)
2619         /* Decode the user name since AIX does not support logn user
2620            names by default.  The name is encoded as _#uid.  */
2621
2622         if (username[0] == '_') {
2623                 uid_t id = atoi(&username[1]);
2624                 struct passwd *pw = NULL;
2625
2626                 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2627                         real_username = strdup(pw->pw_name);
2628                 }
2629         }
2630 #endif
2631
2632         if (!real_username) {
2633                 /* Just making a copy of the username we got from PAM */
2634                 if ((real_username = strdup(username)) == NULL) {
2635                         _pam_log_debug(ctx, LOG_DEBUG,
2636                                        "memory allocation failure when copying "
2637                                        "username");
2638                         retval = PAM_SERVICE_ERR;
2639                         goto out;
2640                 }
2641         }
2642
2643         /* Maybe this was a UPN */
2644
2645         if (strchr(real_username, '@') != NULL) {
2646                 char *samaccountname = NULL;
2647
2648                 samaccountname = winbind_upn_to_username(ctx,
2649                                                          real_username);
2650                 if (samaccountname) {
2651                         free(real_username);
2652                         real_username = strdup(samaccountname);
2653                 }
2654         }
2655
2656         retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2657                                         _("Password: "), NULL,
2658                                         &password);
2659
2660         if (retval != PAM_SUCCESS) {
2661                 _pam_log(ctx, LOG_ERR,
2662                          "Could not retrieve user's password");
2663                 retval = PAM_AUTHTOK_ERR;
2664                 goto out;
2665         }
2666
2667         /* Let's not give too much away in the log file */
2668
2669 #ifdef DEBUG_PASSWORD
2670         _pam_log_debug(ctx, LOG_INFO,
2671                        "Verify user '%s' with password '%s'",
2672                        real_username, password);
2673 #else
2674         _pam_log_debug(ctx, LOG_INFO,
2675                        "Verify user '%s'", real_username);
2676 #endif
2677
2678         member = get_member_from_config(ctx);
2679         cctype = get_krb5_cc_type_from_config(ctx);
2680         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2681
2682         /* Now use the username to look up password */
2683         retval = winbind_auth_request(ctx, real_username, password,
2684                                       member, cctype, warn_pwd_expire,
2685                                       NULL, NULL, NULL,
2686                                       NULL, &username_ret);
2687
2688         if (retval == PAM_NEW_AUTHTOK_REQD ||
2689             retval == PAM_AUTHTOK_EXPIRED) {
2690
2691                 char *new_authtok_required_during_auth = NULL;
2692
2693                 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2694                 if (!new_authtok_required) {
2695                         retval = PAM_BUF_ERR;
2696                         goto out;
2697                 }
2698
2699                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2700                              new_authtok_required,
2701                              _pam_winbind_cleanup_func);
2702
2703                 retval = PAM_SUCCESS;
2704
2705                 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2706                 if (!new_authtok_required_during_auth) {
2707                         retval = PAM_BUF_ERR;
2708                         goto out;
2709                 }
2710
2711                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2712                              new_authtok_required_during_auth,
2713                              _pam_winbind_cleanup_func);
2714
2715                 goto out;
2716         }
2717
2718 out:
2719         if (username_ret) {
2720                 pam_set_item (pamh, PAM_USER, username_ret);
2721                 _pam_log_debug(ctx, LOG_INFO,
2722                                "Returned user was '%s'", username_ret);
2723                 free(username_ret);
2724         }
2725
2726         if (real_username) {
2727                 free(real_username);
2728         }
2729
2730         if (!new_authtok_required) {
2731                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2732         }
2733
2734         if (retval != PAM_SUCCESS) {
2735                 _pam_free_data_info3(pamh);
2736         }
2737
2738         _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2739
2740         TALLOC_FREE(ctx);
2741
2742         return retval;
2743 }
2744
2745 PAM_EXTERN
2746 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2747                    int argc, const char **argv)
2748 {
2749         int ret = PAM_SYSTEM_ERR;
2750         struct pwb_context *ctx = NULL;
2751
2752         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2753         if (ret) {
2754                 goto out;
2755         }
2756
2757         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2758
2759         switch (flags & ~PAM_SILENT) {
2760
2761                 case PAM_DELETE_CRED:
2762                         ret = _pam_delete_cred(pamh, flags, argc, argv);
2763                         break;
2764                 case PAM_REFRESH_CRED:
2765                         _pam_log_debug(ctx, LOG_WARNING,
2766                                        "PAM_REFRESH_CRED not implemented");
2767                         ret = PAM_SUCCESS;
2768                         break;
2769                 case PAM_REINITIALIZE_CRED:
2770                         _pam_log_debug(ctx, LOG_WARNING,
2771                                        "PAM_REINITIALIZE_CRED not implemented");
2772                         ret = PAM_SUCCESS;
2773                         break;
2774                 case PAM_ESTABLISH_CRED:
2775                         _pam_log_debug(ctx, LOG_WARNING,
2776                                        "PAM_ESTABLISH_CRED not implemented");
2777                         ret = PAM_SUCCESS;
2778                         break;
2779                 default:
2780                         ret = PAM_SYSTEM_ERR;
2781                         break;
2782         }
2783
2784  out:
2785
2786         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2787
2788         TALLOC_FREE(ctx);
2789
2790         return ret;
2791 }
2792
2793 /*
2794  * Account management. We want to verify that the account exists
2795  * before returning PAM_SUCCESS
2796  */
2797 PAM_EXTERN
2798 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2799                    int argc, const char **argv)
2800 {
2801         const char *username;
2802         int ret = PAM_USER_UNKNOWN;
2803         void *tmp = NULL;
2804         struct pwb_context *ctx = NULL;
2805
2806         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2807         if (ret) {
2808                 goto out;
2809         }
2810
2811         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2812
2813
2814         /* Get the username */
2815         ret = pam_get_user(pamh, &username, NULL);
2816         if ((ret != PAM_SUCCESS) || (!username)) {
2817                 _pam_log_debug(ctx, LOG_DEBUG,
2818                                "can not get the username");
2819                 ret = PAM_SERVICE_ERR;
2820                 goto out;
2821         }
2822
2823         /* Verify the username */
2824         ret = valid_user(ctx, username);
2825         switch (ret) {
2826         case -1:
2827                 /* some sort of system error. The log was already printed */
2828                 ret = PAM_SERVICE_ERR;
2829                 goto out;
2830         case 1:
2831                 /* the user does not exist */
2832                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2833                                username);
2834                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2835                         ret = PAM_IGNORE;
2836                         goto out;
2837                 }
2838                 ret = PAM_USER_UNKNOWN;
2839                 goto out;
2840         case 0:
2841                 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2842                              (const void **)&tmp);
2843                 if (tmp != NULL) {
2844                         ret = atoi((const char *)tmp);
2845                         switch (ret) {
2846                         case PAM_AUTHTOK_EXPIRED:
2847                                 /* fall through, since new token is required in this case */
2848                         case PAM_NEW_AUTHTOK_REQD:
2849                                 _pam_log(ctx, LOG_WARNING,
2850                                          "pam_sm_acct_mgmt success but %s is set",
2851                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
2852                                 _pam_log(ctx, LOG_NOTICE,
2853                                          "user '%s' needs new password",
2854                                          username);
2855                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2856                                 ret = PAM_NEW_AUTHTOK_REQD;
2857                                 goto out;
2858                         default:
2859                                 _pam_log(ctx, LOG_WARNING,
2860                                          "pam_sm_acct_mgmt success");
2861                                 _pam_log(ctx, LOG_NOTICE,
2862                                          "user '%s' granted access", username);
2863                                 ret = PAM_SUCCESS;
2864                                 goto out;
2865                         }
2866                 }
2867
2868                 /* Otherwise, the authentication looked good */
2869                 _pam_log(ctx, LOG_NOTICE,
2870                          "user '%s' granted access", username);
2871                 ret = PAM_SUCCESS;
2872                 goto out;
2873         default:
2874                 /* we don't know anything about this return value */
2875                 _pam_log(ctx, LOG_ERR,
2876                          "internal module error (ret = %d, user = '%s')",
2877                          ret, username);
2878                 ret = PAM_SERVICE_ERR;
2879                 goto out;
2880         }
2881
2882         /* should not be reached */
2883         ret = PAM_IGNORE;
2884
2885  out:
2886
2887         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2888
2889         TALLOC_FREE(ctx);
2890
2891         return ret;
2892 }
2893
2894 PAM_EXTERN
2895 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2896                         int argc, const char **argv)
2897 {
2898         int ret = PAM_SUCCESS;
2899         struct pwb_context *ctx = NULL;
2900
2901         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2902         if (ret) {
2903                 goto out;
2904         }
2905
2906         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2907
2908         if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2909                 /* check and create homedir */
2910                 ret = _pam_mkhomedir(ctx);
2911         }
2912  out:
2913         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2914
2915         TALLOC_FREE(ctx);
2916
2917         return ret;
2918 }
2919
2920 PAM_EXTERN
2921 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2922                          int argc, const char **argv)
2923 {
2924         int ret = PAM_SUCCESS;
2925         struct pwb_context *ctx = NULL;
2926
2927         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2928         if (ret) {
2929                 goto out;
2930         }
2931
2932         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2933
2934 out:
2935         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2936
2937         TALLOC_FREE(ctx);
2938
2939         return ret;
2940 }
2941
2942 /**
2943  * evaluate whether we need to re-authenticate with kerberos after a
2944  * password change
2945  *
2946  * @param ctx PAM winbind context.
2947  * @param user The username
2948  *
2949  * @return boolean Returns true if required, false if not.
2950  */
2951
2952 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2953                                                    const char *user)
2954 {
2955
2956         /* Make sure that we only do this if a) the chauthtok got initiated
2957          * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2958          * later password change via the "passwd" command if done by the user
2959          * itself
2960          * NB. If we login from gdm or xdm and the password expires,
2961          * we change the password, but there is no memory cache.
2962          * Thus, even for passthrough login, we should do the
2963          * authentication again to update memory cache.
2964          * --- BoYang
2965          * */
2966
2967         char *new_authtok_reqd_during_auth = NULL;
2968         struct passwd *pwd = NULL;
2969
2970         _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2971                       &new_authtok_reqd_during_auth);
2972         pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2973                      NULL, NULL);
2974
2975         if (new_authtok_reqd_during_auth) {
2976                 return true;
2977         }
2978
2979         pwd = getpwnam(user);
2980         if (!pwd) {
2981                 return false;
2982         }
2983
2984         if (getuid() == pwd->pw_uid) {
2985                 return true;
2986         }
2987
2988         return false;
2989 }
2990
2991
2992 PAM_EXTERN
2993 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2994                      int argc, const char **argv)
2995 {
2996         unsigned int lctrl;
2997         int ret;
2998         bool cached_login = false;
2999
3000         /* <DO NOT free() THESE> */
3001         const char *user;
3002         char *pass_old, *pass_new;
3003         /* </DO NOT free() THESE> */
3004
3005         char *Announce;
3006
3007         int retry = 0;
3008         char *username_ret = NULL;
3009         struct wbcAuthErrorInfo *error = NULL;
3010         struct pwb_context *ctx = NULL;
3011
3012         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
3013         if (ret) {
3014                 goto out;
3015         }
3016
3017         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
3018
3019         cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
3020
3021         /* clearing offline bit for auth */
3022         ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
3023
3024         /*
3025          * First get the name of a user
3026          */
3027         ret = pam_get_user(pamh, &user, _("Username: "));
3028         if (ret) {
3029                 _pam_log(ctx, LOG_ERR,
3030                          "password - could not identify user");
3031                 goto out;
3032         }
3033
3034         if (user == NULL) {
3035                 _pam_log(ctx, LOG_ERR, "username was NULL!");
3036                 ret = PAM_USER_UNKNOWN;
3037                 goto out;
3038         }
3039
3040         _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
3041
3042         /* check if this is really a user in winbindd, not only in NSS */
3043         ret = valid_user(ctx, user);
3044         switch (ret) {
3045                 case 1:
3046                         ret = PAM_USER_UNKNOWN;
3047                         goto out;
3048                 case -1:
3049                         ret = PAM_SYSTEM_ERR;
3050                         goto out;
3051                 default:
3052                         break;
3053         }
3054
3055         /*
3056          * obtain and verify the current password (OLDAUTHTOK) for
3057          * the user.
3058          */
3059
3060         if (flags & PAM_PRELIM_CHECK) {
3061                 time_t pwdlastset_prelim = 0;
3062
3063                 /* instruct user what is happening */
3064
3065 #define greeting _("Changing password for")
3066                 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
3067                 if (!Announce) {
3068                         _pam_log(ctx, LOG_CRIT,
3069                                  "password - out of memory");
3070                         ret = PAM_BUF_ERR;
3071                         goto out;
3072                 }
3073 #undef greeting
3074
3075                 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
3076                 ret = _winbind_read_password(ctx, lctrl,
3077                                                 Announce,
3078                                                 _("(current) NT password: "),
3079                                                 NULL,
3080                                                 (const char **) &pass_old);
3081                 TALLOC_FREE(Announce);
3082                 if (ret != PAM_SUCCESS) {
3083                         _pam_log(ctx, LOG_NOTICE,
3084                                  "password - (old) token not obtained");
3085                         goto out;
3086                 }
3087
3088                 /* verify that this is the password for this user */
3089
3090                 ret = winbind_auth_request(ctx, user, pass_old,
3091                                            NULL, NULL, 0,
3092                                            &error, NULL, NULL,
3093                                            &pwdlastset_prelim, NULL);
3094
3095                 if (ret != PAM_ACCT_EXPIRED &&
3096                     ret != PAM_AUTHTOK_EXPIRED &&
3097                     ret != PAM_NEW_AUTHTOK_REQD &&
3098                     ret != PAM_SUCCESS) {
3099                         pass_old = NULL;
3100                         goto out;
3101                 }
3102
3103                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3104                              (void *)pwdlastset_prelim, NULL);
3105
3106                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3107                                    (const void *) pass_old);
3108                 pass_old = NULL;
3109                 if (ret != PAM_SUCCESS) {
3110                         _pam_log(ctx, LOG_CRIT,
3111                                  "failed to set PAM_OLDAUTHTOK");
3112                 }
3113         } else if (flags & PAM_UPDATE_AUTHTOK) {
3114
3115                 time_t pwdlastset_update = 0;
3116
3117                 /*
3118                  * obtain the proposed password
3119                  */
3120
3121                 /*
3122                  * get the old token back.
3123                  */
3124
3125                 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
3126
3127                 if (ret != PAM_SUCCESS) {
3128                         _pam_log(ctx, LOG_NOTICE,
3129                                  "user not authenticated");
3130                         goto out;
3131                 }
3132
3133                 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3134
3135                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3136                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3137                 }
3138                 retry = 0;
3139                 ret = PAM_AUTHTOK_ERR;
3140                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3141                         /*
3142                          * use_authtok is to force the use of a previously entered
3143                          * password -- needed for pluggable password strength checking
3144                          */
3145
3146                         ret = _winbind_read_password(ctx, lctrl,
3147                                                      NULL,
3148                                                      _("Enter new NT password: "),
3149                                                      _("Retype new NT password: "),
3150                                                      (const char **)&pass_new);
3151
3152                         if (ret != PAM_SUCCESS) {
3153                                 _pam_log_debug(ctx, LOG_ALERT,
3154                                                "password - "
3155                                                "new password not obtained");
3156                                 pass_old = NULL;/* tidy up */
3157                                 goto out;
3158                         }
3159
3160                         /*
3161                          * At this point we know who the user is and what they
3162                          * propose as their new password. Verify that the new
3163                          * password is acceptable.
3164                          */
3165
3166                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
3167                                 pass_new = NULL;
3168                         }
3169                 }
3170
3171                 /*
3172                  * By reaching here we have approved the passwords and must now
3173                  * rebuild the password database file.
3174                  */
3175                 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3176                               &pwdlastset_update);
3177
3178                 /*
3179                  * if cached creds were enabled, make sure to set the
3180                  * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3181                  * update the cached creds storage - gd
3182                  */
3183                 if (cached_login) {
3184                         ctx->ctrl |= WINBIND_CACHED_LOGIN;
3185                 }
3186
3187                 ret = winbind_chauthtok_request(ctx, user, pass_old,
3188                                                 pass_new, pwdlastset_update);
3189                 if (ret) {
3190                         pass_old = pass_new = NULL;
3191                         goto out;
3192                 }
3193
3194                 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3195
3196                         const char *member = NULL;
3197                         const char *cctype = NULL;
3198                         int warn_pwd_expire;
3199                         struct wbcLogonUserInfo *info = NULL;
3200                         struct wbcUserPasswordPolicyInfo *policy = NULL;
3201
3202                         member = get_member_from_config(ctx);
3203                         cctype = get_krb5_cc_type_from_config(ctx);
3204                         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3205
3206                         /* Keep WINBIND_CACHED_LOGIN bit for
3207                          * authentication after changing the password.
3208                          * This will update the cached credentials in case
3209                          * that winbindd_dual_pam_chauthtok() fails
3210                          * to update them.
3211                          * --- BoYang
3212                          * */
3213
3214                         ret = winbind_auth_request(ctx, user, pass_new,
3215                                                    member, cctype, 0,
3216                                                    &error, &info, &policy,
3217                                                    NULL, &username_ret);
3218                         pass_old = pass_new = NULL;
3219
3220                         if (ret == PAM_SUCCESS) {
3221
3222                                 struct wbcAuthUserInfo *user_info = NULL;
3223
3224                                 if (info && info->info) {
3225                                         user_info = info->info;
3226                                 }
3227
3228                                 /* warn a user if the password is about to
3229                                  * expire soon */
3230                                 _pam_warn_password_expiry(ctx, user_info, policy,
3231                                                           warn_pwd_expire,
3232                                                           NULL, NULL);
3233
3234                                 /* set some info3 info for other modules in the
3235                                  * stack */
3236                                 _pam_set_data_info3(ctx, user_info);
3237
3238                                 /* put krb5ccname into env */
3239                                 _pam_setup_krb5_env(ctx, info);
3240
3241                                 if (username_ret) {
3242                                         pam_set_item(pamh, PAM_USER,
3243                                                      username_ret);
3244                                         _pam_log_debug(ctx, LOG_INFO,
3245                                                        "Returned user was '%s'",
3246                                                        username_ret);
3247                                         free(username_ret);
3248                                 }
3249
3250                         }
3251
3252                         if (info && info->blobs) {
3253                                 wbcFreeMemory(info->blobs);
3254                         }
3255                         wbcFreeMemory(info);
3256                         wbcFreeMemory(policy);
3257
3258                         goto out;
3259                 }
3260         } else {
3261                 ret = PAM_SERVICE_ERR;
3262         }
3263
3264 out:
3265         {
3266                 /* Deal with offline errors. */
3267                 int i;
3268                 const char *codes[] = {
3269                         "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3270                         "NT_STATUS_NO_LOGON_SERVERS",
3271                         "NT_STATUS_ACCESS_DENIED"
3272                 };
3273
3274                 for (i=0; i<ARRAY_SIZE(codes); i++) {
3275                         int _ret;
3276                         if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3277                                 break;
3278                         }
3279                 }
3280         }
3281
3282         wbcFreeMemory(error);
3283
3284         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3285
3286         TALLOC_FREE(ctx);
3287
3288         return ret;
3289 }
3290
3291 #ifdef PAM_STATIC
3292
3293 /* static module data */
3294
3295 struct pam_module _pam_winbind_modstruct = {
3296         MODULE_NAME,
3297         pam_sm_authenticate,
3298         pam_sm_setcred,
3299         pam_sm_acct_mgmt,
3300         pam_sm_open_session,
3301         pam_sm_close_session,
3302         pam_sm_chauthtok
3303 };
3304
3305 #endif
3306
3307 /*
3308  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
3309  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
3310  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3311  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2008
3312  * Copyright (c) Jan Rêkorajski 1999.
3313  * Copyright (c) Andrew G. Morgan 1996-8.
3314  * Copyright (c) Alex O. Yuriev, 1996.
3315  * Copyright (c) Cristian Gafton 1996.
3316  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3317  *
3318  * Redistribution and use in source and binary forms, with or without
3319  * modification, are permitted provided that the following conditions
3320  * are met:
3321  * 1. Redistributions of source code must retain the above copyright
3322  *    notice, and the entire permission notice in its entirety,
3323  *    including the disclaimer of warranties.
3324  * 2. Redistributions in binary form must reproduce the above copyright
3325  *    notice, this list of conditions and the following disclaimer in the
3326  *    documentation and/or other materials provided with the distribution.
3327  * 3. The name of the author may not be used to endorse or promote
3328  *    products derived from this software without specific prior
3329  *    written permission.
3330  *
3331  * ALTERNATIVELY, this product may be distributed under the terms of
3332  * the GNU Public License, in which case the provisions of the GPL are
3333  * required INSTEAD OF the above restrictions.  (This clause is
3334  * necessary due to a potential bad interaction between the GPL and
3335  * the restrictions contained in a BSD-style copyright.)
3336  *
3337  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3338  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3339  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3340  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3341  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3342  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3343  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3344  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3345  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3346  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3347  * OF THE POSSIBILITY OF SUCH DAMAGE.
3348  */