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         int len;
1141
1142         if (sid_list_buffer_size > 0) {
1143                 sid_list_buffer[0] = 0;
1144         }
1145
1146         search_location = name_list;
1147         while ((comma = strchr(search_location, ',')) != NULL) {
1148                 current_name = strndup(search_location,
1149                                        comma - search_location);
1150                 if (NULL == current_name) {
1151                         goto out;
1152                 }
1153
1154                 if (!winbind_name_to_sid_string(ctx, user,
1155                                                 current_name,
1156                                                 sid_list_buffer,
1157                                                 sid_list_buffer_size)) {
1158                         /*
1159                          * If one group name failed, we must not fail
1160                          * the authentication totally, continue with
1161                          * the following group names. If user belongs to
1162                          * one of the valid groups, we must allow it
1163                          * login. -- BoYang
1164                          */
1165
1166                         _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1167                                  "check if group %s is valid group.", current_name,
1168                                  current_name);
1169                         _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1170                                         "to sid, please contact your administrator to see "
1171                                         "if group %s is valid."), current_name, current_name);
1172                         SAFE_FREE(current_name);
1173                         search_location = comma + 1;
1174                         continue;
1175                 }
1176
1177                 SAFE_FREE(current_name);
1178
1179                 if (!safe_append_string(sid_list_buffer, ",",
1180                                         sid_list_buffer_size)) {
1181                         goto out;
1182                 }
1183
1184                 search_location = comma + 1;
1185         }
1186
1187         if (!winbind_name_to_sid_string(ctx, user, search_location,
1188                                         sid_list_buffer,
1189                                         sid_list_buffer_size)) {
1190                 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1191                          "check if group %s is valid group.", search_location,
1192                          search_location);
1193                 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1194                                 "to sid, please contact your administrator to see "
1195                                 "if group %s is valid."), search_location, search_location);
1196                 /*
1197                  * The lookup of the last name failed..
1198                  * It results in require_member_of_sid ends with ','
1199                  * It is malformated parameter here, overwrite the last ','.
1200                  */
1201                 len = strlen(sid_list_buffer);
1202                 if ((len != 0) && (sid_list_buffer[len - 1] == ',')) {
1203                         sid_list_buffer[len - 1] = '\0';
1204                 }
1205         }
1206
1207         result = true;
1208
1209 out:
1210         SAFE_FREE(current_name);
1211         return result;
1212 }
1213
1214 /**
1215  * put krb5ccname variable into environment
1216  *
1217  * @param ctx PAM winbind context.
1218  * @param krb5ccname env variable retrieved from winbindd.
1219  *
1220  * @return void.
1221  */
1222
1223 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1224                                 struct wbcLogonUserInfo *info)
1225 {
1226         char var[PATH_MAX];
1227         int ret;
1228         uint32_t i;
1229         const char *krb5ccname = NULL;
1230
1231         if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1232                 return;
1233         }
1234
1235         if (!info) {
1236                 return;
1237         }
1238
1239         for (i=0; i < info->num_blobs; i++) {
1240                 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1241                         krb5ccname = (const char *)info->blobs[i].blob.data;
1242                         break;
1243                 }
1244         }
1245
1246         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1247                 return;
1248         }
1249
1250         _pam_log_debug(ctx, LOG_DEBUG,
1251                        "request returned KRB5CCNAME: %s", krb5ccname);
1252
1253         if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
1254                 return;
1255         }
1256
1257         ret = pam_putenv(ctx->pamh, var);
1258         if (ret) {
1259                 _pam_log(ctx, LOG_ERR,
1260                          "failed to set KRB5CCNAME to %s: %s",
1261                          var, pam_strerror(ctx->pamh, ret));
1262         }
1263 }
1264
1265 /**
1266  * Copy unix username if available (further processed in PAM).
1267  *
1268  * @param ctx PAM winbind context
1269  * @param user_ret A pointer that holds a pointer to a string
1270  * @param unix_username A username
1271  *
1272  * @return void.
1273  */
1274
1275 static void _pam_setup_unix_username(struct pwb_context *ctx,
1276                                      char **user_ret,
1277                                      struct wbcLogonUserInfo *info)
1278 {
1279         const char *unix_username = NULL;
1280         uint32_t i;
1281
1282         if (!user_ret || !info) {
1283                 return;
1284         }
1285
1286         for (i=0; i < info->num_blobs; i++) {
1287                 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1288                         unix_username = (const char *)info->blobs[i].blob.data;
1289                         break;
1290                 }
1291         }
1292
1293         if (!unix_username || !unix_username[0]) {
1294                 return;
1295         }
1296
1297         *user_ret = strdup(unix_username);
1298 }
1299
1300 /**
1301  * Set string into the PAM stack.
1302  *
1303  * @param ctx PAM winbind context.
1304  * @param data_name Key name for pam_set_data.
1305  * @param value String value.
1306  *
1307  * @return void.
1308  */
1309
1310 static void _pam_set_data_string(struct pwb_context *ctx,
1311                                  const char *data_name,
1312                                  const char *value)
1313 {
1314         int ret;
1315
1316         if (!data_name || !value || (strlen(data_name) == 0) ||
1317              (strlen(value) == 0)) {
1318                 return;
1319         }
1320
1321         ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1322                            _pam_winbind_cleanup_func);
1323         if (ret) {
1324                 _pam_log_debug(ctx, LOG_DEBUG,
1325                                "Could not set data %s: %s\n",
1326                                data_name, pam_strerror(ctx->pamh, ret));
1327         }
1328 }
1329
1330 /**
1331  * Set info3 strings into the PAM stack.
1332  *
1333  * @param ctx PAM winbind context.
1334  * @param data_name Key name for pam_set_data.
1335  * @param value String value.
1336  *
1337  * @return void.
1338  */
1339
1340 static void _pam_set_data_info3(struct pwb_context *ctx,
1341                                 const struct wbcAuthUserInfo *info)
1342 {
1343         _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1344                              info->home_directory);
1345         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1346                              info->logon_script);
1347         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1348                              info->logon_server);
1349         _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1350                              info->profile_path);
1351 }
1352
1353 /**
1354  * Free info3 strings in the PAM stack.
1355  *
1356  * @param pamh PAM handle
1357  *
1358  * @return void.
1359  */
1360
1361 static void _pam_free_data_info3(pam_handle_t *pamh)
1362 {
1363         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1364         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1365         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1366         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1367 }
1368
1369 /**
1370  * Send PAM_ERROR_MSG for cached or grace logons.
1371  *
1372  * @param ctx PAM winbind context.
1373  * @param username User in PAM request.
1374  * @param info3_user_flgs Info3 flags containing logon type bits.
1375  *
1376  * @return void.
1377  */
1378
1379 static void _pam_warn_logon_type(struct pwb_context *ctx,
1380                                  const char *username,
1381                                  uint32_t info3_user_flgs)
1382 {
1383         /* inform about logon type */
1384         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1385
1386                 _make_remark(ctx, PAM_ERROR_MSG,
1387                              _("Grace login. "
1388                                "Please change your password as soon you're "
1389                                "online again"));
1390                 _pam_log_debug(ctx, LOG_DEBUG,
1391                                "User %s logged on using grace logon\n",
1392                                username);
1393
1394         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1395
1396                 _make_remark(ctx, PAM_ERROR_MSG,
1397                              _("Domain Controller unreachable, "
1398                                "using cached credentials instead. "
1399                                "Network resources may be unavailable"));
1400                 _pam_log_debug(ctx, LOG_DEBUG,
1401                                "User %s logged on using cached credentials\n",
1402                                username);
1403         }
1404 }
1405
1406 /**
1407  * Send PAM_ERROR_MSG for krb5 errors.
1408  *
1409  * @param ctx PAM winbind context.
1410  * @param username User in PAM request.
1411  * @param info3_user_flgs Info3 flags containing logon type bits.
1412  *
1413  * @return void.
1414  */
1415
1416 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1417                                    const char *username,
1418                                    uint32_t info3_user_flgs)
1419 {
1420         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1421                 _make_remark(ctx, PAM_ERROR_MSG,
1422                              _("Failed to establish your Kerberos Ticket cache "
1423                                "due time differences\n"
1424                                "with the domain controller.  "
1425                                "Please verify the system time.\n"));
1426                 _pam_log_debug(ctx, LOG_DEBUG,
1427                                "User %s: Clock skew when getting Krb5 TGT\n",
1428                                username);
1429         }
1430 }
1431
1432 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1433                                        const struct wbcAuthErrorInfo *e,
1434                                        const char *nt_status_string,
1435                                        int *pam_error)
1436 {
1437         const char *ntstatus = NULL;
1438         const char *error_string = NULL;
1439
1440         if (!e || !pam_error) {
1441                 return false;
1442         }
1443
1444         ntstatus = e->nt_string;
1445         if (!ntstatus) {
1446                 return false;
1447         }
1448
1449         if (strcasecmp(ntstatus, nt_status_string) == 0) {
1450
1451                 error_string = _get_ntstatus_error_string(nt_status_string);
1452                 if (error_string) {
1453                         _make_remark(ctx, PAM_ERROR_MSG, error_string);
1454                         *pam_error = e->pam_error;
1455                         return true;
1456                 }
1457
1458                 if (e->display_string) {
1459                         _make_remark(ctx, PAM_ERROR_MSG, e->display_string);
1460                         *pam_error = e->pam_error;
1461                         return true;
1462                 }
1463
1464                 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1465                 *pam_error = e->pam_error;
1466
1467                 return true;
1468         }
1469
1470         return false;
1471 };
1472
1473 /**
1474  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1475  *
1476  * @param i The wbcUserPasswordPolicyInfo struct.
1477  *
1478  * @return string (caller needs to talloc_free).
1479  */
1480
1481 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1482                                                  struct wbcUserPasswordPolicyInfo *i)
1483 {
1484         char *str = NULL;
1485
1486         if (!i) {
1487                 goto failed;
1488         }
1489
1490         str = talloc_asprintf(ctx, _("Your password "));
1491         if (!str) {
1492                 goto failed;
1493         }
1494
1495         if (i->min_length_password > 0) {
1496                 str = talloc_asprintf_append(str,
1497                                _("must be at least %d characters; "),
1498                                i->min_length_password);
1499                 if (!str) {
1500                         goto failed;
1501                 }
1502         }
1503
1504         if (i->password_history > 0) {
1505                 str = talloc_asprintf_append(str,
1506                                _("cannot repeat any of your previous %d "
1507                                 "passwords; "),
1508                                i->password_history);
1509                 if (!str) {
1510                         goto failed;
1511                 }
1512         }
1513
1514         if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1515                 str = talloc_asprintf_append(str,
1516                                _("must contain capitals, numerals "
1517                                  "or punctuation; "
1518                                  "and cannot contain your account "
1519                                  "or full name; "));
1520                 if (!str) {
1521                         goto failed;
1522                 }
1523         }
1524
1525         str = talloc_asprintf_append(str,
1526                        _("Please type a different password. "
1527                          "Type a password which meets these requirements in "
1528                          "both text boxes."));
1529         if (!str) {
1530                 goto failed;
1531         }
1532
1533         return str;
1534
1535  failed:
1536         TALLOC_FREE(str);
1537         return NULL;
1538 }
1539
1540 static int _pam_create_homedir(struct pwb_context *ctx,
1541                                const char *dirname,
1542                                mode_t mode)
1543 {
1544         struct stat sbuf;
1545
1546         if (stat(dirname, &sbuf) == 0) {
1547                 return PAM_SUCCESS;
1548         }
1549
1550         if (mkdir(dirname, mode) != 0) {
1551
1552                 _make_remark_format(ctx, PAM_TEXT_INFO,
1553                                     _("Creating directory: %s failed: %s"),
1554                                     dirname, strerror(errno));
1555                 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1556                  dirname, strerror(errno));
1557                  return PAM_PERM_DENIED;
1558         }
1559
1560         return PAM_SUCCESS;
1561 }
1562
1563 static int _pam_chown_homedir(struct pwb_context *ctx,
1564                               const char *dirname,
1565                               uid_t uid,
1566                               gid_t gid)
1567 {
1568         if (chown(dirname, uid, gid) != 0) {
1569                 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1570                          dirname, strerror(errno));
1571                 return PAM_PERM_DENIED;
1572         }
1573
1574         return PAM_SUCCESS;
1575 }
1576
1577 static int _pam_mkhomedir(struct pwb_context *ctx)
1578 {
1579         struct passwd *pwd = NULL;
1580         char *token = NULL;
1581         char *create_dir = NULL;
1582         char *user_dir = NULL;
1583         int ret;
1584         const char *username;
1585         mode_t mode = 0700;
1586         char *safe_ptr = NULL;
1587         char *p = NULL;
1588
1589         /* Get the username */
1590         ret = pam_get_user(ctx->pamh, &username, NULL);
1591         if ((ret != PAM_SUCCESS) || (!username)) {
1592                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1593                 return PAM_SERVICE_ERR;
1594         }
1595
1596         pwd = getpwnam(username);
1597         if (pwd == NULL) {
1598                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1599                 return PAM_USER_UNKNOWN;
1600         }
1601         _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1602
1603         ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1604         if (ret == PAM_SUCCESS) {
1605                 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1606                                          pwd->pw_uid,
1607                                          pwd->pw_gid);
1608         }
1609
1610         if (ret == PAM_SUCCESS) {
1611                 return ret;
1612         }
1613
1614         /* maybe we need to create parent dirs */
1615         create_dir = talloc_strdup(ctx, "/");
1616         if (!create_dir) {
1617                 return PAM_BUF_ERR;
1618         }
1619
1620         /* find final directory */
1621         user_dir = strrchr(pwd->pw_dir, '/');
1622         if (!user_dir) {
1623                 return PAM_BUF_ERR;
1624         }
1625         user_dir++;
1626
1627         _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1628
1629         p = pwd->pw_dir;
1630
1631         while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1632
1633                 mode = 0755;
1634
1635                 p = NULL;
1636
1637                 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1638
1639                 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1640                 if (!create_dir) {
1641                         return PAM_BUF_ERR;
1642                 }
1643                 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1644
1645                 if (strcmp(token, user_dir) == 0) {
1646                         _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1647                         mode = 0700;
1648                 }
1649
1650                 ret = _pam_create_homedir(ctx, create_dir, mode);
1651                 if (ret) {
1652                         return ret;
1653                 }
1654         }
1655
1656         return _pam_chown_homedir(ctx, create_dir,
1657                                   pwd->pw_uid,
1658                                   pwd->pw_gid);
1659 }
1660
1661 /* talk to winbindd */
1662 static int winbind_auth_request(struct pwb_context *ctx,
1663                                 const char *user,
1664                                 const char *pass,
1665                                 const char *member,
1666                                 const char *cctype,
1667                                 const int warn_pwd_expire,
1668                                 struct wbcAuthErrorInfo **p_error,
1669                                 struct wbcLogonUserInfo **p_info,
1670                                 struct wbcUserPasswordPolicyInfo **p_policy,
1671                                 time_t *pwd_last_set,
1672                                 char **user_ret)
1673 {
1674         wbcErr wbc_status;
1675
1676         struct wbcLogonUserParams logon;
1677         char membership_of[1024];
1678         uid_t user_uid = -1;
1679         uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1680                          WBFLAG_PAM_GET_PWD_POLICY;
1681
1682         struct wbcLogonUserInfo *info = NULL;
1683         struct wbcAuthUserInfo *user_info = NULL;
1684         struct wbcAuthErrorInfo *error = NULL;
1685         struct wbcUserPasswordPolicyInfo *policy = NULL;
1686
1687         int ret = PAM_AUTH_ERR;
1688         int i;
1689         const char *codes[] = {
1690                 "NT_STATUS_PASSWORD_EXPIRED",
1691                 "NT_STATUS_PASSWORD_MUST_CHANGE",
1692                 "NT_STATUS_INVALID_WORKSTATION",
1693                 "NT_STATUS_INVALID_LOGON_HOURS",
1694                 "NT_STATUS_ACCOUNT_EXPIRED",
1695                 "NT_STATUS_ACCOUNT_DISABLED",
1696                 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1697                 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1698                 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1699                 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1700                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1701                 "NT_STATUS_NO_LOGON_SERVERS",
1702                 "NT_STATUS_WRONG_PASSWORD",
1703                 "NT_STATUS_ACCESS_DENIED"
1704         };
1705
1706         if (pwd_last_set) {
1707                 *pwd_last_set = 0;
1708         }
1709
1710         /* Krb5 auth always has to go against the KDC of the user's realm */
1711
1712         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1713                 flags           |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1714         }
1715
1716         if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1717                 struct passwd *pwd = NULL;
1718
1719                 pwd = getpwnam(user);
1720                 if (pwd == NULL) {
1721                         return PAM_USER_UNKNOWN;
1722                 }
1723                 user_uid        = pwd->pw_uid;
1724         }
1725
1726         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1727
1728                 _pam_log_debug(ctx, LOG_DEBUG,
1729                                "enabling krb5 login flag\n");
1730
1731                 flags           |= WBFLAG_PAM_KRB5 |
1732                                    WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1733         }
1734
1735         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1736                 _pam_log_debug(ctx, LOG_DEBUG,
1737                                "enabling cached login flag\n");
1738                 flags           |= WBFLAG_PAM_CACHED_LOGIN;
1739         }
1740
1741         if (user_ret) {
1742                 *user_ret = NULL;
1743                 flags           |= WBFLAG_PAM_UNIX_NAME;
1744         }
1745
1746         if (cctype != NULL) {
1747                 _pam_log_debug(ctx, LOG_DEBUG,
1748                                "enabling request for a %s krb5 ccache\n",
1749                                cctype);
1750         }
1751
1752         if (member != NULL) {
1753
1754                 ZERO_STRUCT(membership_of);
1755
1756                 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1757                                                           membership_of,
1758                                                           sizeof(membership_of))) {
1759                         _pam_log_debug(ctx, LOG_ERR,
1760                                        "failed to serialize membership of sid "
1761                                        "\"%s\"\n", member);
1762                         return PAM_AUTH_ERR;
1763                 }
1764         }
1765
1766         ZERO_STRUCT(logon);
1767
1768         logon.username                  = user;
1769         logon.password                  = pass;
1770
1771         if (cctype) {
1772                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1773                                              &logon.blobs,
1774                                              "krb5_cc_type",
1775                                              0,
1776                                              (uint8_t *)cctype,
1777                                              strlen(cctype)+1);
1778                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1779                         goto done;
1780                 }
1781         }
1782
1783         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1784                                      &logon.blobs,
1785                                      "flags",
1786                                      0,
1787                                      (uint8_t *)&flags,
1788                                      sizeof(flags));
1789         if (!WBC_ERROR_IS_OK(wbc_status)) {
1790                 goto done;
1791         }
1792
1793         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1794                                      &logon.blobs,
1795                                      "user_uid",
1796                                      0,
1797                                      (uint8_t *)&user_uid,
1798                                      sizeof(user_uid));
1799         if (!WBC_ERROR_IS_OK(wbc_status)) {
1800                 goto done;
1801         }
1802
1803         if (member) {
1804                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1805                                              &logon.blobs,
1806                                              "membership_of",
1807                                              0,
1808                                              (uint8_t *)membership_of,
1809                                              sizeof(membership_of));
1810                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1811                         goto done;
1812                 }
1813         }
1814
1815         wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1816         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1817                                           user, "wbcLogonUser");
1818         wbcFreeMemory(logon.blobs);
1819         logon.blobs = NULL;
1820
1821         if (info && info->info) {
1822                 user_info = info->info;
1823         }
1824
1825         if (pwd_last_set && user_info) {
1826                 *pwd_last_set = user_info->pass_last_set_time;
1827         }
1828
1829         if (p_info && info) {
1830                 *p_info = info;
1831         }
1832
1833         if (p_policy && policy) {
1834                 *p_policy = policy;
1835         }
1836
1837         if (p_error && error) {
1838                 /* We want to process the error in the caller. */
1839                 *p_error = error;
1840                 return ret;
1841         }
1842
1843         for (i=0; i<ARRAY_SIZE(codes); i++) {
1844                 int _ret = ret;
1845                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1846                         ret = _ret;
1847                         goto done;
1848                 }
1849         }
1850
1851         if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1852
1853                 bool already_expired = false;
1854                 bool change_pwd = false;
1855
1856                 /* warn a user if the password is about to expire soon */
1857                 _pam_warn_password_expiry(ctx, user_info, policy,
1858                                           warn_pwd_expire,
1859                                           &already_expired,
1860                                           &change_pwd);
1861
1862                 if (already_expired == true) {
1863
1864                         SMB_TIME_T last_set = user_info->pass_last_set_time;
1865
1866                         _pam_log_debug(ctx, LOG_DEBUG,
1867                                        "Password has expired "
1868                                        "(Password was last set: %lld, "
1869                                        "the policy says it should expire here "
1870                                        "%lld (now it's: %ld))\n",
1871                                        (long long int)last_set,
1872                                        (long long int)last_set +
1873                                        policy->expire,
1874                                        (long)time(NULL));
1875
1876                         return PAM_AUTHTOK_EXPIRED;
1877                 }
1878
1879                 if (change_pwd) {
1880                         ret = PAM_NEW_AUTHTOK_REQD;
1881                         goto done;
1882                 }
1883
1884                 /* inform about logon type */
1885                 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1886
1887                 /* inform about krb5 failures */
1888                 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1889
1890                 /* set some info3 info for other modules in the stack */
1891                 _pam_set_data_info3(ctx, user_info);
1892
1893                 /* put krb5ccname into env */
1894                 _pam_setup_krb5_env(ctx, info);
1895
1896                 /* If winbindd returned a username, return the pointer to it
1897                  * here. */
1898                 _pam_setup_unix_username(ctx, user_ret, info);
1899         }
1900
1901  done:
1902         if (logon.blobs) {
1903                 wbcFreeMemory(logon.blobs);
1904         }
1905         if (info && info->blobs && !p_info) {
1906                 wbcFreeMemory(info->blobs);
1907         }
1908         if (error && !p_error) {
1909                 wbcFreeMemory(error);
1910         }
1911         if (info && !p_info) {
1912                 wbcFreeMemory(info);
1913         }
1914         if (policy && !p_policy) {
1915                 wbcFreeMemory(policy);
1916         }
1917
1918         return ret;
1919 }
1920
1921 /* talk to winbindd */
1922 static int winbind_chauthtok_request(struct pwb_context *ctx,
1923                                      const char *user,
1924                                      const char *oldpass,
1925                                      const char *newpass,
1926                                      time_t pwd_last_set)
1927 {
1928         wbcErr wbc_status;
1929         struct wbcChangePasswordParams params;
1930         struct wbcAuthErrorInfo *error = NULL;
1931         struct wbcUserPasswordPolicyInfo *policy = NULL;
1932         enum wbcPasswordChangeRejectReason reject_reason = -1;
1933         uint32_t flags = 0;
1934
1935         int i;
1936         const char *codes[] = {
1937                 "NT_STATUS_BACKUP_CONTROLLER",
1938                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1939                 "NT_STATUS_NO_LOGON_SERVERS",
1940                 "NT_STATUS_ACCESS_DENIED",
1941                 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1942                 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1943                 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1944         };
1945         int ret = PAM_AUTH_ERR;
1946
1947         ZERO_STRUCT(params);
1948
1949         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1950                 flags |= WBFLAG_PAM_KRB5 |
1951                          WBFLAG_PAM_CONTACT_TRUSTDOM;
1952         }
1953
1954         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1955                 flags |= WBFLAG_PAM_CACHED_LOGIN;
1956         }
1957
1958         params.account_name             = user;
1959         params.level                    = WBC_AUTH_USER_LEVEL_PLAIN;
1960         params.old_password.plaintext   = oldpass;
1961         params.new_password.plaintext   = newpass;
1962         params.flags                    = flags;
1963
1964         wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1965         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1966                                           user, "wbcChangeUserPasswordEx");
1967
1968         if (WBC_ERROR_IS_OK(wbc_status)) {
1969                 _pam_log(ctx, LOG_NOTICE,
1970                          "user '%s' password changed", user);
1971                 return PAM_SUCCESS;
1972         }
1973
1974         if (!error) {
1975                 wbcFreeMemory(policy);
1976                 return ret;
1977         }
1978
1979         for (i=0; i<ARRAY_SIZE(codes); i++) {
1980                 int _ret = ret;
1981                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1982                         ret = _ret;
1983                         goto done;
1984                 }
1985         }
1986
1987         if (!strcasecmp(error->nt_string,
1988                         "NT_STATUS_PASSWORD_RESTRICTION")) {
1989
1990                 char *pwd_restriction_string = NULL;
1991                 SMB_TIME_T min_pwd_age = 0;
1992
1993                 if (policy) {
1994                         min_pwd_age     = policy->min_passwordage;
1995                 }
1996
1997                 /* FIXME: avoid to send multiple PAM messages after another */
1998                 switch (reject_reason) {
1999                         case -1:
2000                                 break;
2001                         case WBC_PWD_CHANGE_NO_ERROR:
2002                                 if ((min_pwd_age > 0) &&
2003                                     (pwd_last_set + min_pwd_age > time(NULL))) {
2004                                         PAM_WB_REMARK_DIRECT(ctx,
2005                                              "NT_STATUS_PWD_TOO_RECENT");
2006                                 }
2007                                 break;
2008                         case WBC_PWD_CHANGE_PASSWORD_TOO_SHORT:
2009                                 PAM_WB_REMARK_DIRECT(ctx,
2010                                         "NT_STATUS_PWD_TOO_SHORT");
2011                                 break;
2012                         case WBC_PWD_CHANGE_PWD_IN_HISTORY:
2013                                 PAM_WB_REMARK_DIRECT(ctx,
2014                                         "NT_STATUS_PWD_HISTORY_CONFLICT");
2015                                 break;
2016                         case WBC_PWD_CHANGE_NOT_COMPLEX:
2017                                 _make_remark(ctx, PAM_ERROR_MSG,
2018                                              _("Password does not meet "
2019                                                "complexity requirements"));
2020                                 break;
2021                         default:
2022                                 _pam_log_debug(ctx, LOG_DEBUG,
2023                                                "unknown password change "
2024                                                "reject reason: %d",
2025                                                reject_reason);
2026                                 break;
2027                 }
2028
2029                 pwd_restriction_string =
2030                         _pam_compose_pwd_restriction_string(ctx, policy);
2031                 if (pwd_restriction_string) {
2032                         _make_remark(ctx, PAM_ERROR_MSG,
2033                                      pwd_restriction_string);
2034                         TALLOC_FREE(pwd_restriction_string);
2035                 }
2036         }
2037  done:
2038         wbcFreeMemory(error);
2039         wbcFreeMemory(policy);
2040
2041         return ret;
2042 }
2043
2044 /*
2045  * Checks if a user has an account
2046  *
2047  * return values:
2048  *       1  = User not found
2049  *       0  = OK
2050  *      -1  = System error
2051  */
2052 static int valid_user(struct pwb_context *ctx,
2053                       const char *user)
2054 {
2055         /* check not only if the user is available over NSS calls, also make
2056          * sure it's really a winbind user, this is important when stacking PAM
2057          * modules in the 'account' or 'password' facility. */
2058
2059         wbcErr wbc_status;
2060         struct passwd *pwd = NULL;
2061         struct passwd *wb_pwd = NULL;
2062
2063         pwd = getpwnam(user);
2064         if (pwd == NULL) {
2065                 return 1;
2066         }
2067
2068         wbc_status = wbcGetpwnam(user, &wb_pwd);
2069         wbcFreeMemory(wb_pwd);
2070         if (!WBC_ERROR_IS_OK(wbc_status)) {
2071                 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
2072                         wbcErrorString(wbc_status));
2073         }
2074
2075         switch (wbc_status) {
2076                 case WBC_ERR_UNKNOWN_USER:
2077                         return 1;
2078                 case WBC_ERR_SUCCESS:
2079                         return 0;
2080                 default:
2081                         break;
2082         }
2083         return -1;
2084 }
2085
2086 static char *_pam_delete(register char *xx)
2087 {
2088         _pam_overwrite(xx);
2089         _pam_drop(xx);
2090         return NULL;
2091 }
2092
2093 /*
2094  * obtain a password from the user
2095  */
2096
2097 static int _winbind_read_password(struct pwb_context *ctx,
2098                                   unsigned int ctrl,
2099                                   const char *comment,
2100                                   const char *prompt1,
2101                                   const char *prompt2,
2102                                   const char **pass)
2103 {
2104         int authtok_flag;
2105         int retval;
2106         const char *item;
2107         char *token;
2108
2109         _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2110
2111         /*
2112          * make sure nothing inappropriate gets returned
2113          */
2114
2115         *pass = token = NULL;
2116
2117         /*
2118          * which authentication token are we getting?
2119          */
2120
2121         if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2122                 authtok_flag = PAM_OLDAUTHTOK;
2123         } else {
2124                 authtok_flag = PAM_AUTHTOK;
2125         }
2126
2127         /*
2128          * should we obtain the password from a PAM item ?
2129          */
2130
2131         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2132             on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2133                 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
2134                 if (retval != PAM_SUCCESS) {
2135                         /* very strange. */
2136                         _pam_log(ctx, LOG_ALERT,
2137                                  "pam_get_item returned error "
2138                                  "to unix-read-password");
2139                         return retval;
2140                 } else if (item != NULL) {      /* we have a password! */
2141                         *pass = item;
2142                         item = NULL;
2143                         _pam_log(ctx, LOG_DEBUG,
2144                                  "pam_get_item returned a password");
2145                         return PAM_SUCCESS;
2146                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2147                         return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2148                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2149                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
2150                         return PAM_AUTHTOK_RECOVER_ERR;
2151                 }
2152         }
2153         /*
2154          * getting here implies we will have to get the password from the
2155          * user directly.
2156          */
2157
2158         {
2159                 struct pam_message msg[3], *pmsg[3];
2160                 struct pam_response *resp;
2161                 int i, replies;
2162
2163                 /* prepare to converse */
2164
2165                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2166                         pmsg[0] = &msg[0];
2167                         msg[0].msg_style = PAM_TEXT_INFO;
2168                         msg[0].msg = discard_const_p(char, comment);
2169                         i = 1;
2170                 } else {
2171                         i = 0;
2172                 }
2173
2174                 pmsg[i] = &msg[i];
2175                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2176                 msg[i++].msg = discard_const_p(char, prompt1);
2177                 replies = 1;
2178
2179                 if (prompt2 != NULL) {
2180                         pmsg[i] = &msg[i];
2181                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2182                         msg[i++].msg = discard_const_p(char, prompt2);
2183                         ++replies;
2184                 }
2185                 /* so call the conversation expecting i responses */
2186                 resp = NULL;
2187                 retval = converse(ctx->pamh, i, pmsg, &resp);
2188                 if (resp == NULL) {
2189                         if (retval == PAM_SUCCESS) {
2190                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2191                         }
2192                         goto done;
2193                 }
2194                 if (retval != PAM_SUCCESS) {
2195                         _pam_drop_reply(resp, i);
2196                         goto done;
2197                 }
2198
2199                 /* interpret the response */
2200
2201                 token = x_strdup(resp[i - replies].resp);
2202                 if (!token) {
2203                         _pam_log(ctx, LOG_NOTICE,
2204                                  "could not recover "
2205                                  "authentication token");
2206                         retval = PAM_AUTHTOK_RECOVER_ERR;
2207                         goto done;
2208                 }
2209
2210                 if (replies == 2) {
2211                         /* verify that password entered correctly */
2212                         if (!resp[i - 1].resp ||
2213                             strcmp(token, resp[i - 1].resp)) {
2214                                 _pam_delete(token);     /* mistyped */
2215                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2216                                 _make_remark(ctx, PAM_ERROR_MSG,
2217                                              MISTYPED_PASS);
2218                         }
2219                 }
2220
2221                 /*
2222                  * tidy up the conversation (resp_retcode) is ignored
2223                  * -- what is it for anyway? AGM
2224                  */
2225                 _pam_drop_reply(resp, i);
2226         }
2227
2228  done:
2229         if (retval != PAM_SUCCESS) {
2230                 _pam_log_debug(ctx, LOG_DEBUG,
2231                                "unable to obtain a password");
2232                 return retval;
2233         }
2234         /* 'token' is the entered password */
2235
2236         /* we store this password as an item */
2237
2238         retval = pam_set_item(ctx->pamh, authtok_flag, token);
2239         _pam_delete(token);     /* clean it up */
2240         if (retval != PAM_SUCCESS ||
2241             (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
2242
2243                 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2244                 return retval;
2245
2246         }
2247
2248         *pass = item;
2249         item = NULL;            /* break link to password */
2250
2251         return PAM_SUCCESS;
2252 }
2253
2254 static const char *get_conf_item_string(struct pwb_context *ctx,
2255                                         const char *item,
2256                                         int config_flag)
2257 {
2258         int i = 0;
2259         const char *parm_opt = NULL;
2260
2261         if (!(ctx->ctrl & config_flag)) {
2262                 goto out;
2263         }
2264
2265         /* let the pam opt take precedence over the pam_winbind.conf option */
2266         for (i=0; i<ctx->argc; i++) {
2267
2268                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2269                         char *p;
2270
2271                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2272                                 _pam_log(ctx, LOG_INFO,
2273                                          "no \"=\" delimiter for \"%s\" found\n",
2274                                          item);
2275                                 goto out;
2276                         }
2277                         _pam_log_debug(ctx, LOG_INFO,
2278                                        "PAM config: %s '%s'\n", item, p+1);
2279                         return p + 1;
2280                 }
2281         }
2282
2283         if (ctx->dict) {
2284                 char *key = NULL;
2285
2286                 key = talloc_asprintf(ctx, "global:%s", item);
2287                 if (!key) {
2288                         goto out;
2289                 }
2290
2291                 parm_opt = iniparser_getstr(ctx->dict, key);
2292                 TALLOC_FREE(key);
2293
2294                 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2295                                item, parm_opt);
2296         }
2297 out:
2298         return parm_opt;
2299 }
2300
2301 static int get_config_item_int(struct pwb_context *ctx,
2302                                const char *item,
2303                                int config_flag)
2304 {
2305         int i, parm_opt = -1;
2306
2307         if (!(ctx->ctrl & config_flag)) {
2308                 goto out;
2309         }
2310
2311         /* let the pam opt take precedence over the pam_winbind.conf option */
2312         for (i = 0; i < ctx->argc; i++) {
2313
2314                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2315                         char *p;
2316
2317                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2318                                 _pam_log(ctx, LOG_INFO,
2319                                          "no \"=\" delimiter for \"%s\" found\n",
2320                                          item);
2321                                 goto out;
2322                         }
2323                         parm_opt = atoi(p + 1);
2324                         _pam_log_debug(ctx, LOG_INFO,
2325                                        "PAM config: %s '%d'\n",
2326                                        item, parm_opt);
2327                         return parm_opt;
2328                 }
2329         }
2330
2331         if (ctx->dict) {
2332                 char *key = NULL;
2333
2334                 key = talloc_asprintf(ctx, "global:%s", item);
2335                 if (!key) {
2336                         goto out;
2337                 }
2338
2339                 parm_opt = iniparser_getint(ctx->dict, key, -1);
2340                 TALLOC_FREE(key);
2341
2342                 _pam_log_debug(ctx, LOG_INFO,
2343                                "CONFIG file: %s '%d'\n",
2344                                item, parm_opt);
2345         }
2346 out:
2347         return parm_opt;
2348 }
2349
2350 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2351 {
2352         return get_conf_item_string(ctx, "krb5_ccache_type",
2353                                     WINBIND_KRB5_CCACHE_TYPE);
2354 }
2355
2356 static const char *get_member_from_config(struct pwb_context *ctx)
2357 {
2358         const char *ret = NULL;
2359         ret = get_conf_item_string(ctx, "require_membership_of",
2360                                    WINBIND_REQUIRED_MEMBERSHIP);
2361         if (ret) {
2362                 return ret;
2363         }
2364         return get_conf_item_string(ctx, "require-membership-of",
2365                                     WINBIND_REQUIRED_MEMBERSHIP);
2366 }
2367
2368 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2369 {
2370         int ret;
2371         ret = get_config_item_int(ctx, "warn_pwd_expire",
2372                                   WINBIND_WARN_PWD_EXPIRE);
2373         /* no or broken setting */
2374         if (ret <= 0) {
2375                 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2376         }
2377         return ret;
2378 }
2379
2380 /**
2381  * Retrieve the winbind separator.
2382  *
2383  * @param ctx PAM winbind context.
2384  *
2385  * @return string separator character. NULL on failure.
2386  */
2387
2388 static char winbind_get_separator(struct pwb_context *ctx)
2389 {
2390         wbcErr wbc_status;
2391         static struct wbcInterfaceDetails *details = NULL;
2392
2393         wbc_status = wbcInterfaceDetails(&details);
2394         if (!WBC_ERROR_IS_OK(wbc_status)) {
2395                 _pam_log(ctx, LOG_ERR,
2396                          "Could not retrieve winbind interface details: %s",
2397                          wbcErrorString(wbc_status));
2398                 return '\0';
2399         }
2400
2401         if (!details) {
2402                 return '\0';
2403         }
2404
2405         return details->winbind_separator;
2406 }
2407
2408
2409 /**
2410  * Convert a upn to a name.
2411  *
2412  * @param ctx PAM winbind context.
2413  * @param upn  USer UPN to be trabslated.
2414  *
2415  * @return converted name. NULL pointer on failure. Caller needs to free.
2416  */
2417
2418 static char* winbind_upn_to_username(struct pwb_context *ctx,
2419                                      const char *upn)
2420 {
2421         char sep;
2422         wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2423         struct wbcDomainSid sid;
2424         enum wbcSidType type;
2425         char *domain;
2426         char *name;
2427         char *p;
2428
2429         /* This cannot work when the winbind separator = @ */
2430
2431         sep = winbind_get_separator(ctx);
2432         if (!sep || sep == '@') {
2433                 return NULL;
2434         }
2435
2436         name = talloc_strdup(ctx, upn);
2437         if (!name) {
2438                 return NULL;
2439         }
2440         if ((p = strchr(name, '@')) != NULL) {
2441                 *p = 0;
2442                 domain = p + 1;
2443         }
2444
2445         /* Convert the UPN to a SID */
2446
2447         wbc_status = wbcLookupName(domain, name, &sid, &type);
2448         if (!WBC_ERROR_IS_OK(wbc_status)) {
2449                 return NULL;
2450         }
2451
2452         /* Convert the the SID back to the sAMAccountName */
2453
2454         wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2455         if (!WBC_ERROR_IS_OK(wbc_status)) {
2456                 return NULL;
2457         }
2458
2459         return talloc_asprintf(ctx, "%s\\%s", domain, name);
2460 }
2461
2462 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2463                          int argc, const char **argv)
2464 {
2465         int retval = PAM_SUCCESS;
2466         struct pwb_context *ctx = NULL;
2467         struct wbcLogoffUserParams logoff;
2468         struct wbcAuthErrorInfo *error = NULL;
2469         const char *user;
2470         wbcErr wbc_status = WBC_ERR_SUCCESS;
2471
2472         ZERO_STRUCT(logoff);
2473
2474         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2475         if (retval) {
2476                 goto out;
2477         }
2478
2479         _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2480
2481         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2482
2483                 /* destroy the ccache here */
2484
2485                 uint32_t wbc_flags = 0;
2486                 const char *ccname = NULL;
2487                 struct passwd *pwd = NULL;
2488
2489                 retval = pam_get_user(pamh, &user, _("Username: "));
2490                 if (retval) {
2491                         _pam_log(ctx, LOG_ERR,
2492                                  "could not identify user");
2493                         goto out;
2494                 }
2495
2496                 if (user == NULL) {
2497                         _pam_log(ctx, LOG_ERR,
2498                                  "username was NULL!");
2499                         retval = PAM_USER_UNKNOWN;
2500                         goto out;
2501                 }
2502
2503                 _pam_log_debug(ctx, LOG_DEBUG,
2504                                "username [%s] obtained", user);
2505
2506                 ccname = pam_getenv(pamh, "KRB5CCNAME");
2507                 if (ccname == NULL) {
2508                         _pam_log_debug(ctx, LOG_DEBUG,
2509                                        "user has no KRB5CCNAME environment");
2510                 }
2511
2512                 pwd = getpwnam(user);
2513                 if (pwd == NULL) {
2514                         retval = PAM_USER_UNKNOWN;
2515                         goto out;
2516                 }
2517
2518                 wbc_flags = WBFLAG_PAM_KRB5 |
2519                         WBFLAG_PAM_CONTACT_TRUSTDOM;
2520
2521                 logoff.username         = user;
2522
2523                 if (ccname) {
2524                         wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2525                                                      &logoff.blobs,
2526                                                      "ccfilename",
2527                                                      0,
2528                                                      (uint8_t *)ccname,
2529                                                      strlen(ccname)+1);
2530                         if (!WBC_ERROR_IS_OK(wbc_status)) {
2531                                 goto out;
2532                         }
2533                 }
2534
2535                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2536                                              &logoff.blobs,
2537                                              "flags",
2538                                              0,
2539                                              (uint8_t *)&wbc_flags,
2540                                              sizeof(wbc_flags));
2541                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2542                         goto out;
2543                 }
2544
2545                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2546                                              &logoff.blobs,
2547                                              "user_uid",
2548                                              0,
2549                                              (uint8_t *)&pwd->pw_uid,
2550                                              sizeof(pwd->pw_uid));
2551                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2552                         goto out;
2553                 }
2554
2555                 wbc_status = wbcLogoffUserEx(&logoff, &error);
2556                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2557                                                      user, "wbcLogoffUser");
2558                 wbcFreeMemory(error);
2559                 wbcFreeMemory(logoff.blobs);
2560                 logoff.blobs = NULL;
2561
2562                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2563                         _pam_log(ctx, LOG_INFO,
2564                                  "failed to logoff user %s: %s\n",
2565                                          user, wbcErrorString(wbc_status));
2566                 }
2567         }
2568
2569 out:
2570         if (logoff.blobs) {
2571                 wbcFreeMemory(logoff.blobs);
2572         }
2573
2574         if (!WBC_ERROR_IS_OK(wbc_status)) {
2575                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2576                      user, "wbcLogoffUser");
2577         }
2578
2579         /*
2580          * Delete the krb5 ccname variable from the PAM environment
2581          * if it was set by winbind.
2582          */
2583         if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2584                 pam_putenv(pamh, "KRB5CCNAME");
2585         }
2586
2587         _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2588
2589         TALLOC_FREE(ctx);
2590
2591         return retval;
2592 }
2593
2594 PAM_EXTERN
2595 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2596                         int argc, const char **argv)
2597 {
2598         const char *username;
2599         const char *password;
2600         const char *member = NULL;
2601         const char *cctype = NULL;
2602         int warn_pwd_expire;
2603         int retval = PAM_AUTH_ERR;
2604         char *username_ret = NULL;
2605         char *new_authtok_required = NULL;
2606         char *real_username = NULL;
2607         struct pwb_context *ctx = NULL;
2608
2609         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2610         if (retval) {
2611                 goto out;
2612         }
2613
2614         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2615
2616         /* Get the username */
2617         retval = pam_get_user(pamh, &username, NULL);
2618         if ((retval != PAM_SUCCESS) || (!username)) {
2619                 _pam_log_debug(ctx, LOG_DEBUG,
2620                                "can not get the username");
2621                 retval = PAM_SERVICE_ERR;
2622                 goto out;
2623         }
2624
2625
2626 #if defined(AIX)
2627         /* Decode the user name since AIX does not support logn user
2628            names by default.  The name is encoded as _#uid.  */
2629
2630         if (username[0] == '_') {
2631                 uid_t id = atoi(&username[1]);
2632                 struct passwd *pw = NULL;
2633
2634                 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2635                         real_username = strdup(pw->pw_name);
2636                 }
2637         }
2638 #endif
2639
2640         if (!real_username) {
2641                 /* Just making a copy of the username we got from PAM */
2642                 if ((real_username = strdup(username)) == NULL) {
2643                         _pam_log_debug(ctx, LOG_DEBUG,
2644                                        "memory allocation failure when copying "
2645                                        "username");
2646                         retval = PAM_SERVICE_ERR;
2647                         goto out;
2648                 }
2649         }
2650
2651         /* Maybe this was a UPN */
2652
2653         if (strchr(real_username, '@') != NULL) {
2654                 char *samaccountname = NULL;
2655
2656                 samaccountname = winbind_upn_to_username(ctx,
2657                                                          real_username);
2658                 if (samaccountname) {
2659                         free(real_username);
2660                         real_username = strdup(samaccountname);
2661                 }
2662         }
2663
2664         retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2665                                         _("Password: "), NULL,
2666                                         &password);
2667
2668         if (retval != PAM_SUCCESS) {
2669                 _pam_log(ctx, LOG_ERR,
2670                          "Could not retrieve user's password");
2671                 retval = PAM_AUTHTOK_ERR;
2672                 goto out;
2673         }
2674
2675         /* Let's not give too much away in the log file */
2676
2677 #ifdef DEBUG_PASSWORD
2678         _pam_log_debug(ctx, LOG_INFO,
2679                        "Verify user '%s' with password '%s'",
2680                        real_username, password);
2681 #else
2682         _pam_log_debug(ctx, LOG_INFO,
2683                        "Verify user '%s'", real_username);
2684 #endif
2685
2686         member = get_member_from_config(ctx);
2687         cctype = get_krb5_cc_type_from_config(ctx);
2688         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2689
2690         /* Now use the username to look up password */
2691         retval = winbind_auth_request(ctx, real_username, password,
2692                                       member, cctype, warn_pwd_expire,
2693                                       NULL, NULL, NULL,
2694                                       NULL, &username_ret);
2695
2696         if (retval == PAM_NEW_AUTHTOK_REQD ||
2697             retval == PAM_AUTHTOK_EXPIRED) {
2698
2699                 char *new_authtok_required_during_auth = NULL;
2700
2701                 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2702                 if (!new_authtok_required) {
2703                         retval = PAM_BUF_ERR;
2704                         goto out;
2705                 }
2706
2707                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2708                              new_authtok_required,
2709                              _pam_winbind_cleanup_func);
2710
2711                 retval = PAM_SUCCESS;
2712
2713                 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2714                 if (!new_authtok_required_during_auth) {
2715                         retval = PAM_BUF_ERR;
2716                         goto out;
2717                 }
2718
2719                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2720                              new_authtok_required_during_auth,
2721                              _pam_winbind_cleanup_func);
2722
2723                 goto out;
2724         }
2725
2726 out:
2727         if (username_ret) {
2728                 pam_set_item (pamh, PAM_USER, username_ret);
2729                 _pam_log_debug(ctx, LOG_INFO,
2730                                "Returned user was '%s'", username_ret);
2731                 free(username_ret);
2732         }
2733
2734         if (real_username) {
2735                 free(real_username);
2736         }
2737
2738         if (!new_authtok_required) {
2739                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2740         }
2741
2742         if (retval != PAM_SUCCESS) {
2743                 _pam_free_data_info3(pamh);
2744         }
2745
2746         _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2747
2748         TALLOC_FREE(ctx);
2749
2750         return retval;
2751 }
2752
2753 PAM_EXTERN
2754 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2755                    int argc, const char **argv)
2756 {
2757         int ret = PAM_SYSTEM_ERR;
2758         struct pwb_context *ctx = NULL;
2759
2760         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2761         if (ret) {
2762                 goto out;
2763         }
2764
2765         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2766
2767         switch (flags & ~PAM_SILENT) {
2768
2769                 case PAM_DELETE_CRED:
2770                         ret = _pam_delete_cred(pamh, flags, argc, argv);
2771                         break;
2772                 case PAM_REFRESH_CRED:
2773                         _pam_log_debug(ctx, LOG_WARNING,
2774                                        "PAM_REFRESH_CRED not implemented");
2775                         ret = PAM_SUCCESS;
2776                         break;
2777                 case PAM_REINITIALIZE_CRED:
2778                         _pam_log_debug(ctx, LOG_WARNING,
2779                                        "PAM_REINITIALIZE_CRED not implemented");
2780                         ret = PAM_SUCCESS;
2781                         break;
2782                 case PAM_ESTABLISH_CRED:
2783                         _pam_log_debug(ctx, LOG_WARNING,
2784                                        "PAM_ESTABLISH_CRED not implemented");
2785                         ret = PAM_SUCCESS;
2786                         break;
2787                 default:
2788                         ret = PAM_SYSTEM_ERR;
2789                         break;
2790         }
2791
2792  out:
2793
2794         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2795
2796         TALLOC_FREE(ctx);
2797
2798         return ret;
2799 }
2800
2801 /*
2802  * Account management. We want to verify that the account exists
2803  * before returning PAM_SUCCESS
2804  */
2805 PAM_EXTERN
2806 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2807                    int argc, const char **argv)
2808 {
2809         const char *username;
2810         int ret = PAM_USER_UNKNOWN;
2811         void *tmp = NULL;
2812         struct pwb_context *ctx = NULL;
2813
2814         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2815         if (ret) {
2816                 goto out;
2817         }
2818
2819         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2820
2821
2822         /* Get the username */
2823         ret = pam_get_user(pamh, &username, NULL);
2824         if ((ret != PAM_SUCCESS) || (!username)) {
2825                 _pam_log_debug(ctx, LOG_DEBUG,
2826                                "can not get the username");
2827                 ret = PAM_SERVICE_ERR;
2828                 goto out;
2829         }
2830
2831         /* Verify the username */
2832         ret = valid_user(ctx, username);
2833         switch (ret) {
2834         case -1:
2835                 /* some sort of system error. The log was already printed */
2836                 ret = PAM_SERVICE_ERR;
2837                 goto out;
2838         case 1:
2839                 /* the user does not exist */
2840                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2841                                username);
2842                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2843                         ret = PAM_IGNORE;
2844                         goto out;
2845                 }
2846                 ret = PAM_USER_UNKNOWN;
2847                 goto out;
2848         case 0:
2849                 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2850                              (const void **)&tmp);
2851                 if (tmp != NULL) {
2852                         ret = atoi((const char *)tmp);
2853                         switch (ret) {
2854                         case PAM_AUTHTOK_EXPIRED:
2855                                 /* fall through, since new token is required in this case */
2856                         case PAM_NEW_AUTHTOK_REQD:
2857                                 _pam_log(ctx, LOG_WARNING,
2858                                          "pam_sm_acct_mgmt success but %s is set",
2859                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
2860                                 _pam_log(ctx, LOG_NOTICE,
2861                                          "user '%s' needs new password",
2862                                          username);
2863                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2864                                 ret = PAM_NEW_AUTHTOK_REQD;
2865                                 goto out;
2866                         default:
2867                                 _pam_log(ctx, LOG_WARNING,
2868                                          "pam_sm_acct_mgmt success");
2869                                 _pam_log(ctx, LOG_NOTICE,
2870                                          "user '%s' granted access", username);
2871                                 ret = PAM_SUCCESS;
2872                                 goto out;
2873                         }
2874                 }
2875
2876                 /* Otherwise, the authentication looked good */
2877                 _pam_log(ctx, LOG_NOTICE,
2878                          "user '%s' granted access", username);
2879                 ret = PAM_SUCCESS;
2880                 goto out;
2881         default:
2882                 /* we don't know anything about this return value */
2883                 _pam_log(ctx, LOG_ERR,
2884                          "internal module error (ret = %d, user = '%s')",
2885                          ret, username);
2886                 ret = PAM_SERVICE_ERR;
2887                 goto out;
2888         }
2889
2890         /* should not be reached */
2891         ret = PAM_IGNORE;
2892
2893  out:
2894
2895         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2896
2897         TALLOC_FREE(ctx);
2898
2899         return ret;
2900 }
2901
2902 PAM_EXTERN
2903 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2904                         int argc, const char **argv)
2905 {
2906         int ret = PAM_SUCCESS;
2907         struct pwb_context *ctx = NULL;
2908
2909         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2910         if (ret) {
2911                 goto out;
2912         }
2913
2914         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2915
2916         if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2917                 /* check and create homedir */
2918                 ret = _pam_mkhomedir(ctx);
2919         }
2920  out:
2921         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2922
2923         TALLOC_FREE(ctx);
2924
2925         return ret;
2926 }
2927
2928 PAM_EXTERN
2929 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2930                          int argc, const char **argv)
2931 {
2932         int ret = PAM_SUCCESS;
2933         struct pwb_context *ctx = NULL;
2934
2935         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2936         if (ret) {
2937                 goto out;
2938         }
2939
2940         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2941
2942 out:
2943         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2944
2945         TALLOC_FREE(ctx);
2946
2947         return ret;
2948 }
2949
2950 /**
2951  * evaluate whether we need to re-authenticate with kerberos after a
2952  * password change
2953  *
2954  * @param ctx PAM winbind context.
2955  * @param user The username
2956  *
2957  * @return boolean Returns true if required, false if not.
2958  */
2959
2960 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2961                                                    const char *user)
2962 {
2963
2964         /* Make sure that we only do this if a) the chauthtok got initiated
2965          * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2966          * later password change via the "passwd" command if done by the user
2967          * itself
2968          * NB. If we login from gdm or xdm and the password expires,
2969          * we change the password, but there is no memory cache.
2970          * Thus, even for passthrough login, we should do the
2971          * authentication again to update memory cache.
2972          * --- BoYang
2973          * */
2974
2975         char *new_authtok_reqd_during_auth = NULL;
2976         struct passwd *pwd = NULL;
2977
2978         _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2979                       &new_authtok_reqd_during_auth);
2980         pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2981                      NULL, NULL);
2982
2983         if (new_authtok_reqd_during_auth) {
2984                 return true;
2985         }
2986
2987         pwd = getpwnam(user);
2988         if (!pwd) {
2989                 return false;
2990         }
2991
2992         if (getuid() == pwd->pw_uid) {
2993                 return true;
2994         }
2995
2996         return false;
2997 }
2998
2999
3000 PAM_EXTERN
3001 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
3002                      int argc, const char **argv)
3003 {
3004         unsigned int lctrl;
3005         int ret;
3006         bool cached_login = false;
3007
3008         /* <DO NOT free() THESE> */
3009         const char *user;
3010         char *pass_old, *pass_new;
3011         /* </DO NOT free() THESE> */
3012
3013         char *Announce;
3014
3015         int retry = 0;
3016         char *username_ret = NULL;
3017         struct wbcAuthErrorInfo *error = NULL;
3018         struct pwb_context *ctx = NULL;
3019
3020         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
3021         if (ret) {
3022                 goto out;
3023         }
3024
3025         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
3026
3027         cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
3028
3029         /* clearing offline bit for auth */
3030         ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
3031
3032         /*
3033          * First get the name of a user
3034          */
3035         ret = pam_get_user(pamh, &user, _("Username: "));
3036         if (ret) {
3037                 _pam_log(ctx, LOG_ERR,
3038                          "password - could not identify user");
3039                 goto out;
3040         }
3041
3042         if (user == NULL) {
3043                 _pam_log(ctx, LOG_ERR, "username was NULL!");
3044                 ret = PAM_USER_UNKNOWN;
3045                 goto out;
3046         }
3047
3048         _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
3049
3050         /* check if this is really a user in winbindd, not only in NSS */
3051         ret = valid_user(ctx, user);
3052         switch (ret) {
3053                 case 1:
3054                         ret = PAM_USER_UNKNOWN;
3055                         goto out;
3056                 case -1:
3057                         ret = PAM_SYSTEM_ERR;
3058                         goto out;
3059                 default:
3060                         break;
3061         }
3062
3063         /*
3064          * obtain and verify the current password (OLDAUTHTOK) for
3065          * the user.
3066          */
3067
3068         if (flags & PAM_PRELIM_CHECK) {
3069                 time_t pwdlastset_prelim = 0;
3070
3071                 /* instruct user what is happening */
3072
3073 #define greeting _("Changing password for")
3074                 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
3075                 if (!Announce) {
3076                         _pam_log(ctx, LOG_CRIT,
3077                                  "password - out of memory");
3078                         ret = PAM_BUF_ERR;
3079                         goto out;
3080                 }
3081 #undef greeting
3082
3083                 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
3084                 ret = _winbind_read_password(ctx, lctrl,
3085                                                 Announce,
3086                                                 _("(current) NT password: "),
3087                                                 NULL,
3088                                                 (const char **) &pass_old);
3089                 TALLOC_FREE(Announce);
3090                 if (ret != PAM_SUCCESS) {
3091                         _pam_log(ctx, LOG_NOTICE,
3092                                  "password - (old) token not obtained");
3093                         goto out;
3094                 }
3095
3096                 /* verify that this is the password for this user */
3097
3098                 ret = winbind_auth_request(ctx, user, pass_old,
3099                                            NULL, NULL, 0,
3100                                            &error, NULL, NULL,
3101                                            &pwdlastset_prelim, NULL);
3102
3103                 if (ret != PAM_ACCT_EXPIRED &&
3104                     ret != PAM_AUTHTOK_EXPIRED &&
3105                     ret != PAM_NEW_AUTHTOK_REQD &&
3106                     ret != PAM_SUCCESS) {
3107                         pass_old = NULL;
3108                         goto out;
3109                 }
3110
3111                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3112                              (void *)pwdlastset_prelim, NULL);
3113
3114                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3115                                    (const void *) pass_old);
3116                 pass_old = NULL;
3117                 if (ret != PAM_SUCCESS) {
3118                         _pam_log(ctx, LOG_CRIT,
3119                                  "failed to set PAM_OLDAUTHTOK");
3120                 }
3121         } else if (flags & PAM_UPDATE_AUTHTOK) {
3122
3123                 time_t pwdlastset_update = 0;
3124
3125                 /*
3126                  * obtain the proposed password
3127                  */
3128
3129                 /*
3130                  * get the old token back.
3131                  */
3132
3133                 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
3134
3135                 if (ret != PAM_SUCCESS) {
3136                         _pam_log(ctx, LOG_NOTICE,
3137                                  "user not authenticated");
3138                         goto out;
3139                 }
3140
3141                 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3142
3143                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3144                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3145                 }
3146                 retry = 0;
3147                 ret = PAM_AUTHTOK_ERR;
3148                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3149                         /*
3150                          * use_authtok is to force the use of a previously entered
3151                          * password -- needed for pluggable password strength checking
3152                          */
3153
3154                         ret = _winbind_read_password(ctx, lctrl,
3155                                                      NULL,
3156                                                      _("Enter new NT password: "),
3157                                                      _("Retype new NT password: "),
3158                                                      (const char **)&pass_new);
3159
3160                         if (ret != PAM_SUCCESS) {
3161                                 _pam_log_debug(ctx, LOG_ALERT,
3162                                                "password - "
3163                                                "new password not obtained");
3164                                 pass_old = NULL;/* tidy up */
3165                                 goto out;
3166                         }
3167
3168                         /*
3169                          * At this point we know who the user is and what they
3170                          * propose as their new password. Verify that the new
3171                          * password is acceptable.
3172                          */
3173
3174                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
3175                                 pass_new = NULL;
3176                         }
3177                 }
3178
3179                 /*
3180                  * By reaching here we have approved the passwords and must now
3181                  * rebuild the password database file.
3182                  */
3183                 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3184                               &pwdlastset_update);
3185
3186                 /*
3187                  * if cached creds were enabled, make sure to set the
3188                  * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3189                  * update the cached creds storage - gd
3190                  */
3191                 if (cached_login) {
3192                         ctx->ctrl |= WINBIND_CACHED_LOGIN;
3193                 }
3194
3195                 ret = winbind_chauthtok_request(ctx, user, pass_old,
3196                                                 pass_new, pwdlastset_update);
3197                 if (ret) {
3198                         pass_old = pass_new = NULL;
3199                         goto out;
3200                 }
3201
3202                 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3203
3204                         const char *member = NULL;
3205                         const char *cctype = NULL;
3206                         int warn_pwd_expire;
3207                         struct wbcLogonUserInfo *info = NULL;
3208                         struct wbcUserPasswordPolicyInfo *policy = NULL;
3209
3210                         member = get_member_from_config(ctx);
3211                         cctype = get_krb5_cc_type_from_config(ctx);
3212                         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3213
3214                         /* Keep WINBIND_CACHED_LOGIN bit for
3215                          * authentication after changing the password.
3216                          * This will update the cached credentials in case
3217                          * that winbindd_dual_pam_chauthtok() fails
3218                          * to update them.
3219                          * --- BoYang
3220                          * */
3221
3222                         ret = winbind_auth_request(ctx, user, pass_new,
3223                                                    member, cctype, 0,
3224                                                    &error, &info, &policy,
3225                                                    NULL, &username_ret);
3226                         pass_old = pass_new = NULL;
3227
3228                         if (ret == PAM_SUCCESS) {
3229
3230                                 struct wbcAuthUserInfo *user_info = NULL;
3231
3232                                 if (info && info->info) {
3233                                         user_info = info->info;
3234                                 }
3235
3236                                 /* warn a user if the password is about to
3237                                  * expire soon */
3238                                 _pam_warn_password_expiry(ctx, user_info, policy,
3239                                                           warn_pwd_expire,
3240                                                           NULL, NULL);
3241
3242                                 /* set some info3 info for other modules in the
3243                                  * stack */
3244                                 _pam_set_data_info3(ctx, user_info);
3245
3246                                 /* put krb5ccname into env */
3247                                 _pam_setup_krb5_env(ctx, info);
3248
3249                                 if (username_ret) {
3250                                         pam_set_item(pamh, PAM_USER,
3251                                                      username_ret);
3252                                         _pam_log_debug(ctx, LOG_INFO,
3253                                                        "Returned user was '%s'",
3254                                                        username_ret);
3255                                         free(username_ret);
3256                                 }
3257
3258                         }
3259
3260                         if (info && info->blobs) {
3261                                 wbcFreeMemory(info->blobs);
3262                         }
3263                         wbcFreeMemory(info);
3264                         wbcFreeMemory(policy);
3265
3266                         goto out;
3267                 }
3268         } else {
3269                 ret = PAM_SERVICE_ERR;
3270         }
3271
3272 out:
3273         {
3274                 /* Deal with offline errors. */
3275                 int i;
3276                 const char *codes[] = {
3277                         "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3278                         "NT_STATUS_NO_LOGON_SERVERS",
3279                         "NT_STATUS_ACCESS_DENIED"
3280                 };
3281
3282                 for (i=0; i<ARRAY_SIZE(codes); i++) {
3283                         int _ret;
3284                         if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3285                                 break;
3286                         }
3287                 }
3288         }
3289
3290         wbcFreeMemory(error);
3291
3292         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3293
3294         TALLOC_FREE(ctx);
3295
3296         return ret;
3297 }
3298
3299 #ifdef PAM_STATIC
3300
3301 /* static module data */
3302
3303 struct pam_module _pam_winbind_modstruct = {
3304         MODULE_NAME,
3305         pam_sm_authenticate,
3306         pam_sm_setcred,
3307         pam_sm_acct_mgmt,
3308         pam_sm_open_session,
3309         pam_sm_close_session,
3310         pam_sm_chauthtok
3311 };
3312
3313 #endif
3314
3315 /*
3316  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
3317  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
3318  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3319  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2008
3320  * Copyright (c) Jan Rêkorajski 1999.
3321  * Copyright (c) Andrew G. Morgan 1996-8.
3322  * Copyright (c) Alex O. Yuriev, 1996.
3323  * Copyright (c) Cristian Gafton 1996.
3324  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3325  *
3326  * Redistribution and use in source and binary forms, with or without
3327  * modification, are permitted provided that the following conditions
3328  * are met:
3329  * 1. Redistributions of source code must retain the above copyright
3330  *    notice, and the entire permission notice in its entirety,
3331  *    including the disclaimer of warranties.
3332  * 2. Redistributions in binary form must reproduce the above copyright
3333  *    notice, this list of conditions and the following disclaimer in the
3334  *    documentation and/or other materials provided with the distribution.
3335  * 3. The name of the author may not be used to endorse or promote
3336  *    products derived from this software without specific prior
3337  *    written permission.
3338  *
3339  * ALTERNATIVELY, this product may be distributed under the terms of
3340  * the GNU Public License, in which case the provisions of the GPL are
3341  * required INSTEAD OF the above restrictions.  (This clause is
3342  * necessary due to a potential bad interaction between the GPL and
3343  * the restrictions contained in a BSD-style copyright.)
3344  *
3345  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3346  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3347  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3348  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3349  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3350  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3351  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3352  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3353  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3354  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3355  * OF THE POSSIBILITY OF SUCH DAMAGE.
3356  */