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