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 = strstr(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) {
1203                         if (sid_list_buffer[len - 1] == ',') {
1204                                 sid_list_buffer[len - 1] = '\0';
1205                         }
1206                 }
1207         }
1208
1209         result = true;
1210
1211 out:
1212         SAFE_FREE(current_name);
1213         return result;
1214 }
1215
1216 /**
1217  * put krb5ccname variable into environment
1218  *
1219  * @param ctx PAM winbind context.
1220  * @param krb5ccname env variable retrieved from winbindd.
1221  *
1222  * @return void.
1223  */
1224
1225 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1226                                 struct wbcLogonUserInfo *info)
1227 {
1228         char var[PATH_MAX];
1229         int ret;
1230         uint32_t i;
1231         const char *krb5ccname = NULL;
1232
1233         if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1234                 return;
1235         }
1236
1237         if (!info) {
1238                 return;
1239         }
1240
1241         for (i=0; i < info->num_blobs; i++) {
1242                 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1243                         krb5ccname = (const char *)info->blobs[i].blob.data;
1244                         break;
1245                 }
1246         }
1247
1248         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1249                 return;
1250         }
1251
1252         _pam_log_debug(ctx, LOG_DEBUG,
1253                        "request returned KRB5CCNAME: %s", krb5ccname);
1254
1255         if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
1256                 return;
1257         }
1258
1259         ret = pam_putenv(ctx->pamh, var);
1260         if (ret) {
1261                 _pam_log(ctx, LOG_ERR,
1262                          "failed to set KRB5CCNAME to %s: %s",
1263                          var, pam_strerror(ctx->pamh, ret));
1264         }
1265 }
1266
1267 /**
1268  * Copy unix username if available (further processed in PAM).
1269  *
1270  * @param ctx PAM winbind context
1271  * @param user_ret A pointer that holds a pointer to a string
1272  * @param unix_username A username
1273  *
1274  * @return void.
1275  */
1276
1277 static void _pam_setup_unix_username(struct pwb_context *ctx,
1278                                      char **user_ret,
1279                                      struct wbcLogonUserInfo *info)
1280 {
1281         const char *unix_username = NULL;
1282         uint32_t i;
1283
1284         if (!user_ret || !info) {
1285                 return;
1286         }
1287
1288         for (i=0; i < info->num_blobs; i++) {
1289                 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1290                         unix_username = (const char *)info->blobs[i].blob.data;
1291                         break;
1292                 }
1293         }
1294
1295         if (!unix_username || !unix_username[0]) {
1296                 return;
1297         }
1298
1299         *user_ret = strdup(unix_username);
1300 }
1301
1302 /**
1303  * Set string into the PAM stack.
1304  *
1305  * @param ctx PAM winbind context.
1306  * @param data_name Key name for pam_set_data.
1307  * @param value String value.
1308  *
1309  * @return void.
1310  */
1311
1312 static void _pam_set_data_string(struct pwb_context *ctx,
1313                                  const char *data_name,
1314                                  const char *value)
1315 {
1316         int ret;
1317
1318         if (!data_name || !value || (strlen(data_name) == 0) ||
1319              (strlen(value) == 0)) {
1320                 return;
1321         }
1322
1323         ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1324                            _pam_winbind_cleanup_func);
1325         if (ret) {
1326                 _pam_log_debug(ctx, LOG_DEBUG,
1327                                "Could not set data %s: %s\n",
1328                                data_name, pam_strerror(ctx->pamh, ret));
1329         }
1330 }
1331
1332 /**
1333  * Set info3 strings into the PAM stack.
1334  *
1335  * @param ctx PAM winbind context.
1336  * @param data_name Key name for pam_set_data.
1337  * @param value String value.
1338  *
1339  * @return void.
1340  */
1341
1342 static void _pam_set_data_info3(struct pwb_context *ctx,
1343                                 const struct wbcAuthUserInfo *info)
1344 {
1345         _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1346                              info->home_directory);
1347         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1348                              info->logon_script);
1349         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1350                              info->logon_server);
1351         _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1352                              info->profile_path);
1353 }
1354
1355 /**
1356  * Free info3 strings in the PAM stack.
1357  *
1358  * @param pamh PAM handle
1359  *
1360  * @return void.
1361  */
1362
1363 static void _pam_free_data_info3(pam_handle_t *pamh)
1364 {
1365         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1366         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1367         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1368         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1369 }
1370
1371 /**
1372  * Send PAM_ERROR_MSG for cached or grace logons.
1373  *
1374  * @param ctx PAM winbind context.
1375  * @param username User in PAM request.
1376  * @param info3_user_flgs Info3 flags containing logon type bits.
1377  *
1378  * @return void.
1379  */
1380
1381 static void _pam_warn_logon_type(struct pwb_context *ctx,
1382                                  const char *username,
1383                                  uint32_t info3_user_flgs)
1384 {
1385         /* inform about logon type */
1386         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1387
1388                 _make_remark(ctx, PAM_ERROR_MSG,
1389                              _("Grace login. "
1390                                "Please change your password as soon you're "
1391                                "online again"));
1392                 _pam_log_debug(ctx, LOG_DEBUG,
1393                                "User %s logged on using grace logon\n",
1394                                username);
1395
1396         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1397
1398                 _make_remark(ctx, PAM_ERROR_MSG,
1399                              _("Domain Controller unreachable, "
1400                                "using cached credentials instead. "
1401                                "Network resources may be unavailable"));
1402                 _pam_log_debug(ctx, LOG_DEBUG,
1403                                "User %s logged on using cached credentials\n",
1404                                username);
1405         }
1406 }
1407
1408 /**
1409  * Send PAM_ERROR_MSG for krb5 errors.
1410  *
1411  * @param ctx PAM winbind context.
1412  * @param username User in PAM request.
1413  * @param info3_user_flgs Info3 flags containing logon type bits.
1414  *
1415  * @return void.
1416  */
1417
1418 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1419                                    const char *username,
1420                                    uint32_t info3_user_flgs)
1421 {
1422         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1423                 _make_remark(ctx, PAM_ERROR_MSG,
1424                              _("Failed to establish your Kerberos Ticket cache "
1425                                "due time differences\n"
1426                                "with the domain controller.  "
1427                                "Please verify the system time.\n"));
1428                 _pam_log_debug(ctx, LOG_DEBUG,
1429                                "User %s: Clock skew when getting Krb5 TGT\n",
1430                                username);
1431         }
1432 }
1433
1434 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1435                                        const struct wbcAuthErrorInfo *e,
1436                                        const char *nt_status_string,
1437                                        int *pam_error)
1438 {
1439         const char *ntstatus = NULL;
1440         const char *error_string = NULL;
1441
1442         if (!e || !pam_error) {
1443                 return false;
1444         }
1445
1446         ntstatus = e->nt_string;
1447         if (!ntstatus) {
1448                 return false;
1449         }
1450
1451         if (strcasecmp(ntstatus, nt_status_string) == 0) {
1452
1453                 error_string = _get_ntstatus_error_string(nt_status_string);
1454                 if (error_string) {
1455                         _make_remark(ctx, PAM_ERROR_MSG, error_string);
1456                         *pam_error = e->pam_error;
1457                         return true;
1458                 }
1459
1460                 if (e->display_string) {
1461                         _make_remark(ctx, PAM_ERROR_MSG, e->display_string);
1462                         *pam_error = e->pam_error;
1463                         return true;
1464                 }
1465
1466                 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1467                 *pam_error = e->pam_error;
1468
1469                 return true;
1470         }
1471
1472         return false;
1473 };
1474
1475 /**
1476  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1477  *
1478  * @param i The wbcUserPasswordPolicyInfo struct.
1479  *
1480  * @return string (caller needs to talloc_free).
1481  */
1482
1483 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1484                                                  struct wbcUserPasswordPolicyInfo *i)
1485 {
1486         char *str = NULL;
1487
1488         if (!i) {
1489                 goto failed;
1490         }
1491
1492         str = talloc_asprintf(ctx, _("Your password "));
1493         if (!str) {
1494                 goto failed;
1495         }
1496
1497         if (i->min_length_password > 0) {
1498                 str = talloc_asprintf_append(str,
1499                                _("must be at least %d characters; "),
1500                                i->min_length_password);
1501                 if (!str) {
1502                         goto failed;
1503                 }
1504         }
1505
1506         if (i->password_history > 0) {
1507                 str = talloc_asprintf_append(str,
1508                                _("cannot repeat any of your previous %d "
1509                                 "passwords; "),
1510                                i->password_history);
1511                 if (!str) {
1512                         goto failed;
1513                 }
1514         }
1515
1516         if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1517                 str = talloc_asprintf_append(str,
1518                                _("must contain capitals, numerals "
1519                                  "or punctuation; "
1520                                  "and cannot contain your account "
1521                                  "or full name; "));
1522                 if (!str) {
1523                         goto failed;
1524                 }
1525         }
1526
1527         str = talloc_asprintf_append(str,
1528                        _("Please type a different password. "
1529                          "Type a password which meets these requirements in "
1530                          "both text boxes."));
1531         if (!str) {
1532                 goto failed;
1533         }
1534
1535         return str;
1536
1537  failed:
1538         TALLOC_FREE(str);
1539         return NULL;
1540 }
1541
1542 static int _pam_create_homedir(struct pwb_context *ctx,
1543                                const char *dirname,
1544                                mode_t mode)
1545 {
1546         struct stat sbuf;
1547
1548         if (stat(dirname, &sbuf) == 0) {
1549                 return PAM_SUCCESS;
1550         }
1551
1552         if (mkdir(dirname, mode) != 0) {
1553
1554                 _make_remark_format(ctx, PAM_TEXT_INFO,
1555                                     _("Creating directory: %s failed: %s"),
1556                                     dirname, strerror(errno));
1557                 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1558                  dirname, strerror(errno));
1559                  return PAM_PERM_DENIED;
1560         }
1561
1562         return PAM_SUCCESS;
1563 }
1564
1565 static int _pam_chown_homedir(struct pwb_context *ctx,
1566                               const char *dirname,
1567                               uid_t uid,
1568                               gid_t gid)
1569 {
1570         if (chown(dirname, uid, gid) != 0) {
1571                 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1572                          dirname, strerror(errno));
1573                 return PAM_PERM_DENIED;
1574         }
1575
1576         return PAM_SUCCESS;
1577 }
1578
1579 static int _pam_mkhomedir(struct pwb_context *ctx)
1580 {
1581         struct passwd *pwd = NULL;
1582         char *token = NULL;
1583         char *create_dir = NULL;
1584         char *user_dir = NULL;
1585         int ret;
1586         const char *username;
1587         mode_t mode = 0700;
1588         char *safe_ptr = NULL;
1589         char *p = NULL;
1590
1591         /* Get the username */
1592         ret = pam_get_user(ctx->pamh, &username, NULL);
1593         if ((ret != PAM_SUCCESS) || (!username)) {
1594                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1595                 return PAM_SERVICE_ERR;
1596         }
1597
1598         pwd = getpwnam(username);
1599         if (pwd == NULL) {
1600                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1601                 return PAM_USER_UNKNOWN;
1602         }
1603         _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1604
1605         ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1606         if (ret == PAM_SUCCESS) {
1607                 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1608                                          pwd->pw_uid,
1609                                          pwd->pw_gid);
1610         }
1611
1612         if (ret == PAM_SUCCESS) {
1613                 return ret;
1614         }
1615
1616         /* maybe we need to create parent dirs */
1617         create_dir = talloc_strdup(ctx, "/");
1618         if (!create_dir) {
1619                 return PAM_BUF_ERR;
1620         }
1621
1622         /* find final directory */
1623         user_dir = strrchr(pwd->pw_dir, '/');
1624         if (!user_dir) {
1625                 return PAM_BUF_ERR;
1626         }
1627         user_dir++;
1628
1629         _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1630
1631         p = pwd->pw_dir;
1632
1633         while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1634
1635                 mode = 0755;
1636
1637                 p = NULL;
1638
1639                 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1640
1641                 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1642                 if (!create_dir) {
1643                         return PAM_BUF_ERR;
1644                 }
1645                 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1646
1647                 if (strcmp(token, user_dir) == 0) {
1648                         _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1649                         mode = 0700;
1650                 }
1651
1652                 ret = _pam_create_homedir(ctx, create_dir, mode);
1653                 if (ret) {
1654                         return ret;
1655                 }
1656         }
1657
1658         return _pam_chown_homedir(ctx, create_dir,
1659                                   pwd->pw_uid,
1660                                   pwd->pw_gid);
1661 }
1662
1663 /* talk to winbindd */
1664 static int winbind_auth_request(struct pwb_context *ctx,
1665                                 const char *user,
1666                                 const char *pass,
1667                                 const char *member,
1668                                 const char *cctype,
1669                                 const int warn_pwd_expire,
1670                                 struct wbcAuthErrorInfo **p_error,
1671                                 struct wbcLogonUserInfo **p_info,
1672                                 struct wbcUserPasswordPolicyInfo **p_policy,
1673                                 time_t *pwd_last_set,
1674                                 char **user_ret)
1675 {
1676         wbcErr wbc_status;
1677
1678         struct wbcLogonUserParams logon;
1679         char membership_of[1024];
1680         uid_t user_uid = -1;
1681         uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1682                          WBFLAG_PAM_GET_PWD_POLICY;
1683
1684         struct wbcLogonUserInfo *info = NULL;
1685         struct wbcAuthUserInfo *user_info = NULL;
1686         struct wbcAuthErrorInfo *error = NULL;
1687         struct wbcUserPasswordPolicyInfo *policy = NULL;
1688
1689         int ret = PAM_AUTH_ERR;
1690         int i;
1691         const char *codes[] = {
1692                 "NT_STATUS_PASSWORD_EXPIRED",
1693                 "NT_STATUS_PASSWORD_MUST_CHANGE",
1694                 "NT_STATUS_INVALID_WORKSTATION",
1695                 "NT_STATUS_INVALID_LOGON_HOURS",
1696                 "NT_STATUS_ACCOUNT_EXPIRED",
1697                 "NT_STATUS_ACCOUNT_DISABLED",
1698                 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1699                 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1700                 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1701                 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1702                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1703                 "NT_STATUS_NO_LOGON_SERVERS",
1704                 "NT_STATUS_WRONG_PASSWORD",
1705                 "NT_STATUS_ACCESS_DENIED"
1706         };
1707
1708         if (pwd_last_set) {
1709                 *pwd_last_set = 0;
1710         }
1711
1712         /* Krb5 auth always has to go against the KDC of the user's realm */
1713
1714         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1715                 flags           |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1716         }
1717
1718         if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1719                 struct passwd *pwd = NULL;
1720
1721                 pwd = getpwnam(user);
1722                 if (pwd == NULL) {
1723                         return PAM_USER_UNKNOWN;
1724                 }
1725                 user_uid        = pwd->pw_uid;
1726         }
1727
1728         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1729
1730                 _pam_log_debug(ctx, LOG_DEBUG,
1731                                "enabling krb5 login flag\n");
1732
1733                 flags           |= WBFLAG_PAM_KRB5 |
1734                                    WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1735         }
1736
1737         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1738                 _pam_log_debug(ctx, LOG_DEBUG,
1739                                "enabling cached login flag\n");
1740                 flags           |= WBFLAG_PAM_CACHED_LOGIN;
1741         }
1742
1743         if (user_ret) {
1744                 *user_ret = NULL;
1745                 flags           |= WBFLAG_PAM_UNIX_NAME;
1746         }
1747
1748         if (cctype != NULL) {
1749                 _pam_log_debug(ctx, LOG_DEBUG,
1750                                "enabling request for a %s krb5 ccache\n",
1751                                cctype);
1752         }
1753
1754         if (member != NULL) {
1755
1756                 ZERO_STRUCT(membership_of);
1757
1758                 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1759                                                           membership_of,
1760                                                           sizeof(membership_of))) {
1761                         _pam_log_debug(ctx, LOG_ERR,
1762                                        "failed to serialize membership of sid "
1763                                        "\"%s\"\n", member);
1764                         return PAM_AUTH_ERR;
1765                 }
1766         }
1767
1768         ZERO_STRUCT(logon);
1769
1770         logon.username                  = user;
1771         logon.password                  = pass;
1772
1773         if (cctype) {
1774                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1775                                              &logon.blobs,
1776                                              "krb5_cc_type",
1777                                              0,
1778                                              (uint8_t *)cctype,
1779                                              strlen(cctype)+1);
1780                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1781                         goto done;
1782                 }
1783         }
1784
1785         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1786                                      &logon.blobs,
1787                                      "flags",
1788                                      0,
1789                                      (uint8_t *)&flags,
1790                                      sizeof(flags));
1791         if (!WBC_ERROR_IS_OK(wbc_status)) {
1792                 goto done;
1793         }
1794
1795         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1796                                      &logon.blobs,
1797                                      "user_uid",
1798                                      0,
1799                                      (uint8_t *)&user_uid,
1800                                      sizeof(user_uid));
1801         if (!WBC_ERROR_IS_OK(wbc_status)) {
1802                 goto done;
1803         }
1804
1805         if (member) {
1806                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1807                                              &logon.blobs,
1808                                              "membership_of",
1809                                              0,
1810                                              (uint8_t *)membership_of,
1811                                              sizeof(membership_of));
1812                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1813                         goto done;
1814                 }
1815         }
1816
1817         wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1818         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1819                                           user, "wbcLogonUser");
1820         wbcFreeMemory(logon.blobs);
1821         logon.blobs = NULL;
1822
1823         if (info && info->info) {
1824                 user_info = info->info;
1825         }
1826
1827         if (pwd_last_set && user_info) {
1828                 *pwd_last_set = user_info->pass_last_set_time;
1829         }
1830
1831         if (p_info && info) {
1832                 *p_info = info;
1833         }
1834
1835         if (p_policy && policy) {
1836                 *p_policy = policy;
1837         }
1838
1839         if (p_error && error) {
1840                 /* We want to process the error in the caller. */
1841                 *p_error = error;
1842                 return ret;
1843         }
1844
1845         for (i=0; i<ARRAY_SIZE(codes); i++) {
1846                 int _ret = ret;
1847                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1848                         ret = _ret;
1849                         goto done;
1850                 }
1851         }
1852
1853         if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1854
1855                 bool already_expired = false;
1856                 bool change_pwd = false;
1857
1858                 /* warn a user if the password is about to expire soon */
1859                 _pam_warn_password_expiry(ctx, user_info, policy,
1860                                           warn_pwd_expire,
1861                                           &already_expired,
1862                                           &change_pwd);
1863
1864                 if (already_expired == true) {
1865
1866                         SMB_TIME_T last_set = user_info->pass_last_set_time;
1867
1868                         _pam_log_debug(ctx, LOG_DEBUG,
1869                                        "Password has expired "
1870                                        "(Password was last set: %lld, "
1871                                        "the policy says it should expire here "
1872                                        "%lld (now it's: %ld))\n",
1873                                        (long long int)last_set,
1874                                        (long long int)last_set +
1875                                        policy->expire,
1876                                        (long)time(NULL));
1877
1878                         return PAM_AUTHTOK_EXPIRED;
1879                 }
1880
1881                 if (change_pwd) {
1882                         ret = PAM_NEW_AUTHTOK_REQD;
1883                         goto done;
1884                 }
1885
1886                 /* inform about logon type */
1887                 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1888
1889                 /* inform about krb5 failures */
1890                 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1891
1892                 /* set some info3 info for other modules in the stack */
1893                 _pam_set_data_info3(ctx, user_info);
1894
1895                 /* put krb5ccname into env */
1896                 _pam_setup_krb5_env(ctx, info);
1897
1898                 /* If winbindd returned a username, return the pointer to it
1899                  * here. */
1900                 _pam_setup_unix_username(ctx, user_ret, info);
1901         }
1902
1903  done:
1904         if (logon.blobs) {
1905                 wbcFreeMemory(logon.blobs);
1906         }
1907         if (info && info->blobs && !p_info) {
1908                 wbcFreeMemory(info->blobs);
1909         }
1910         if (error && !p_error) {
1911                 wbcFreeMemory(error);
1912         }
1913         if (info && !p_info) {
1914                 wbcFreeMemory(info);
1915         }
1916         if (policy && !p_policy) {
1917                 wbcFreeMemory(policy);
1918         }
1919
1920         return ret;
1921 }
1922
1923 /* talk to winbindd */
1924 static int winbind_chauthtok_request(struct pwb_context *ctx,
1925                                      const char *user,
1926                                      const char *oldpass,
1927                                      const char *newpass,
1928                                      time_t pwd_last_set)
1929 {
1930         wbcErr wbc_status;
1931         struct wbcChangePasswordParams params;
1932         struct wbcAuthErrorInfo *error = NULL;
1933         struct wbcUserPasswordPolicyInfo *policy = NULL;
1934         enum wbcPasswordChangeRejectReason reject_reason = -1;
1935         uint32_t flags = 0;
1936
1937         int i;
1938         const char *codes[] = {
1939                 "NT_STATUS_BACKUP_CONTROLLER",
1940                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1941                 "NT_STATUS_NO_LOGON_SERVERS",
1942                 "NT_STATUS_ACCESS_DENIED",
1943                 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1944                 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1945                 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1946         };
1947         int ret = PAM_AUTH_ERR;
1948
1949         ZERO_STRUCT(params);
1950
1951         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1952                 flags |= WBFLAG_PAM_KRB5 |
1953                          WBFLAG_PAM_CONTACT_TRUSTDOM;
1954         }
1955
1956         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1957                 flags |= WBFLAG_PAM_CACHED_LOGIN;
1958         }
1959
1960         params.account_name             = user;
1961         params.level                    = WBC_AUTH_USER_LEVEL_PLAIN;
1962         params.old_password.plaintext   = oldpass;
1963         params.new_password.plaintext   = newpass;
1964         params.flags                    = flags;
1965
1966         wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1967         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1968                                           user, "wbcChangeUserPasswordEx");
1969
1970         if (WBC_ERROR_IS_OK(wbc_status)) {
1971                 _pam_log(ctx, LOG_NOTICE,
1972                          "user '%s' password changed", user);
1973                 return PAM_SUCCESS;
1974         }
1975
1976         if (!error) {
1977                 wbcFreeMemory(policy);
1978                 return ret;
1979         }
1980
1981         for (i=0; i<ARRAY_SIZE(codes); i++) {
1982                 int _ret = ret;
1983                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1984                         ret = _ret;
1985                         goto done;
1986                 }
1987         }
1988
1989         if (!strcasecmp(error->nt_string,
1990                         "NT_STATUS_PASSWORD_RESTRICTION")) {
1991
1992                 char *pwd_restriction_string = NULL;
1993                 SMB_TIME_T min_pwd_age = 0;
1994
1995                 if (policy) {
1996                         min_pwd_age     = policy->min_passwordage;
1997                 }
1998
1999                 /* FIXME: avoid to send multiple PAM messages after another */
2000                 switch (reject_reason) {
2001                         case -1:
2002                                 break;
2003                         case WBC_PWD_CHANGE_REJECT_OTHER:
2004                                 if ((min_pwd_age > 0) &&
2005                                     (pwd_last_set + min_pwd_age > time(NULL))) {
2006                                         PAM_WB_REMARK_DIRECT(ctx,
2007                                              "NT_STATUS_PWD_TOO_RECENT");
2008                                 }
2009                                 break;
2010                         case WBC_PWD_CHANGE_REJECT_TOO_SHORT:
2011                                 PAM_WB_REMARK_DIRECT(ctx,
2012                                         "NT_STATUS_PWD_TOO_SHORT");
2013                                 break;
2014                         case WBC_PWD_CHANGE_REJECT_IN_HISTORY:
2015                                 PAM_WB_REMARK_DIRECT(ctx,
2016                                         "NT_STATUS_PWD_HISTORY_CONFLICT");
2017                                 break;
2018                         case WBC_PWD_CHANGE_REJECT_COMPLEXITY:
2019                                 _make_remark(ctx, PAM_ERROR_MSG,
2020                                              _("Password does not meet "
2021                                                "complexity requirements"));
2022                                 break;
2023                         default:
2024                                 _pam_log_debug(ctx, LOG_DEBUG,
2025                                                "unknown password change "
2026                                                "reject reason: %d",
2027                                                reject_reason);
2028                                 break;
2029                 }
2030
2031                 pwd_restriction_string =
2032                         _pam_compose_pwd_restriction_string(ctx, policy);
2033                 if (pwd_restriction_string) {
2034                         _make_remark(ctx, PAM_ERROR_MSG,
2035                                      pwd_restriction_string);
2036                         TALLOC_FREE(pwd_restriction_string);
2037                 }
2038         }
2039  done:
2040         wbcFreeMemory(error);
2041         wbcFreeMemory(policy);
2042
2043         return ret;
2044 }
2045
2046 /*
2047  * Checks if a user has an account
2048  *
2049  * return values:
2050  *       1  = User not found
2051  *       0  = OK
2052  *      -1  = System error
2053  */
2054 static int valid_user(struct pwb_context *ctx,
2055                       const char *user)
2056 {
2057         /* check not only if the user is available over NSS calls, also make
2058          * sure it's really a winbind user, this is important when stacking PAM
2059          * modules in the 'account' or 'password' facility. */
2060
2061         wbcErr wbc_status;
2062         struct passwd *pwd = NULL;
2063         struct passwd *wb_pwd = NULL;
2064
2065         pwd = getpwnam(user);
2066         if (pwd == NULL) {
2067                 return 1;
2068         }
2069
2070         wbc_status = wbcGetpwnam(user, &wb_pwd);
2071         wbcFreeMemory(wb_pwd);
2072         if (!WBC_ERROR_IS_OK(wbc_status)) {
2073                 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
2074                         wbcErrorString(wbc_status));
2075         }
2076
2077         switch (wbc_status) {
2078                 case WBC_ERR_UNKNOWN_USER:
2079                         return 1;
2080                 case WBC_ERR_SUCCESS:
2081                         return 0;
2082                 default:
2083                         break;
2084         }
2085         return -1;
2086 }
2087
2088 static char *_pam_delete(register char *xx)
2089 {
2090         _pam_overwrite(xx);
2091         _pam_drop(xx);
2092         return NULL;
2093 }
2094
2095 /*
2096  * obtain a password from the user
2097  */
2098
2099 static int _winbind_read_password(struct pwb_context *ctx,
2100                                   unsigned int ctrl,
2101                                   const char *comment,
2102                                   const char *prompt1,
2103                                   const char *prompt2,
2104                                   const char **pass)
2105 {
2106         int authtok_flag;
2107         int retval;
2108         const char *item;
2109         char *token;
2110
2111         _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2112
2113         /*
2114          * make sure nothing inappropriate gets returned
2115          */
2116
2117         *pass = token = NULL;
2118
2119         /*
2120          * which authentication token are we getting?
2121          */
2122
2123         if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2124                 authtok_flag = PAM_OLDAUTHTOK;
2125         } else {
2126                 authtok_flag = PAM_AUTHTOK;
2127         }
2128
2129         /*
2130          * should we obtain the password from a PAM item ?
2131          */
2132
2133         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2134             on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2135                 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
2136                 if (retval != PAM_SUCCESS) {
2137                         /* very strange. */
2138                         _pam_log(ctx, LOG_ALERT,
2139                                  "pam_get_item returned error "
2140                                  "to unix-read-password");
2141                         return retval;
2142                 } else if (item != NULL) {      /* we have a password! */
2143                         *pass = item;
2144                         item = NULL;
2145                         _pam_log(ctx, LOG_DEBUG,
2146                                  "pam_get_item returned a password");
2147                         return PAM_SUCCESS;
2148                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2149                         return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2150                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2151                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
2152                         return PAM_AUTHTOK_RECOVER_ERR;
2153                 }
2154         }
2155         /*
2156          * getting here implies we will have to get the password from the
2157          * user directly.
2158          */
2159
2160         {
2161                 struct pam_message msg[3], *pmsg[3];
2162                 struct pam_response *resp;
2163                 int i, replies;
2164
2165                 /* prepare to converse */
2166
2167                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2168                         pmsg[0] = &msg[0];
2169                         msg[0].msg_style = PAM_TEXT_INFO;
2170                         msg[0].msg = discard_const_p(char, comment);
2171                         i = 1;
2172                 } else {
2173                         i = 0;
2174                 }
2175
2176                 pmsg[i] = &msg[i];
2177                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2178                 msg[i++].msg = discard_const_p(char, prompt1);
2179                 replies = 1;
2180
2181                 if (prompt2 != NULL) {
2182                         pmsg[i] = &msg[i];
2183                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2184                         msg[i++].msg = discard_const_p(char, prompt2);
2185                         ++replies;
2186                 }
2187                 /* so call the conversation expecting i responses */
2188                 resp = NULL;
2189                 retval = converse(ctx->pamh, i, pmsg, &resp);
2190                 if (resp == NULL) {
2191                         if (retval == PAM_SUCCESS) {
2192                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2193                         }
2194                         goto done;
2195                 }
2196                 if (retval != PAM_SUCCESS) {
2197                         _pam_drop_reply(resp, i);
2198                         goto done;
2199                 }
2200
2201                 /* interpret the response */
2202
2203                 token = x_strdup(resp[i - replies].resp);
2204                 if (!token) {
2205                         _pam_log(ctx, LOG_NOTICE,
2206                                  "could not recover "
2207                                  "authentication token");
2208                         retval = PAM_AUTHTOK_RECOVER_ERR;
2209                         goto done;
2210                 }
2211
2212                 if (replies == 2) {
2213                         /* verify that password entered correctly */
2214                         if (!resp[i - 1].resp ||
2215                             strcmp(token, resp[i - 1].resp)) {
2216                                 _pam_delete(token);     /* mistyped */
2217                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2218                                 _make_remark(ctx, PAM_ERROR_MSG,
2219                                              MISTYPED_PASS);
2220                         }
2221                 }
2222
2223                 /*
2224                  * tidy up the conversation (resp_retcode) is ignored
2225                  * -- what is it for anyway? AGM
2226                  */
2227                 _pam_drop_reply(resp, i);
2228         }
2229
2230  done:
2231         if (retval != PAM_SUCCESS) {
2232                 _pam_log_debug(ctx, LOG_DEBUG,
2233                                "unable to obtain a password");
2234                 return retval;
2235         }
2236         /* 'token' is the entered password */
2237
2238         /* we store this password as an item */
2239
2240         retval = pam_set_item(ctx->pamh, authtok_flag, token);
2241         _pam_delete(token);     /* clean it up */
2242         if (retval != PAM_SUCCESS ||
2243             (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
2244
2245                 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2246                 return retval;
2247
2248         }
2249
2250         *pass = item;
2251         item = NULL;            /* break link to password */
2252
2253         return PAM_SUCCESS;
2254 }
2255
2256 static const char *get_conf_item_string(struct pwb_context *ctx,
2257                                         const char *item,
2258                                         int config_flag)
2259 {
2260         int i = 0;
2261         const char *parm_opt = NULL;
2262
2263         if (!(ctx->ctrl & config_flag)) {
2264                 goto out;
2265         }
2266
2267         /* let the pam opt take precedence over the pam_winbind.conf option */
2268         for (i=0; i<ctx->argc; i++) {
2269
2270                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2271                         char *p;
2272
2273                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2274                                 _pam_log(ctx, LOG_INFO,
2275                                          "no \"=\" delimiter for \"%s\" found\n",
2276                                          item);
2277                                 goto out;
2278                         }
2279                         _pam_log_debug(ctx, LOG_INFO,
2280                                        "PAM config: %s '%s'\n", item, p+1);
2281                         return p + 1;
2282                 }
2283         }
2284
2285         if (ctx->dict) {
2286                 char *key = NULL;
2287
2288                 key = talloc_asprintf(ctx, "global:%s", item);
2289                 if (!key) {
2290                         goto out;
2291                 }
2292
2293                 parm_opt = iniparser_getstr(ctx->dict, key);
2294                 TALLOC_FREE(key);
2295
2296                 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2297                                item, parm_opt);
2298         }
2299 out:
2300         return parm_opt;
2301 }
2302
2303 static int get_config_item_int(struct pwb_context *ctx,
2304                                const char *item,
2305                                int config_flag)
2306 {
2307         int i, parm_opt = -1;
2308
2309         if (!(ctx->ctrl & config_flag)) {
2310                 goto out;
2311         }
2312
2313         /* let the pam opt take precedence over the pam_winbind.conf option */
2314         for (i = 0; i < ctx->argc; i++) {
2315
2316                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2317                         char *p;
2318
2319                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2320                                 _pam_log(ctx, LOG_INFO,
2321                                          "no \"=\" delimiter for \"%s\" found\n",
2322                                          item);
2323                                 goto out;
2324                         }
2325                         parm_opt = atoi(p + 1);
2326                         _pam_log_debug(ctx, LOG_INFO,
2327                                        "PAM config: %s '%d'\n",
2328                                        item, parm_opt);
2329                         return parm_opt;
2330                 }
2331         }
2332
2333         if (ctx->dict) {
2334                 char *key = NULL;
2335
2336                 key = talloc_asprintf(ctx, "global:%s", item);
2337                 if (!key) {
2338                         goto out;
2339                 }
2340
2341                 parm_opt = iniparser_getint(ctx->dict, key, -1);
2342                 TALLOC_FREE(key);
2343
2344                 _pam_log_debug(ctx, LOG_INFO,
2345                                "CONFIG file: %s '%d'\n",
2346                                item, parm_opt);
2347         }
2348 out:
2349         return parm_opt;
2350 }
2351
2352 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2353 {
2354         return get_conf_item_string(ctx, "krb5_ccache_type",
2355                                     WINBIND_KRB5_CCACHE_TYPE);
2356 }
2357
2358 static const char *get_member_from_config(struct pwb_context *ctx)
2359 {
2360         const char *ret = NULL;
2361         ret = get_conf_item_string(ctx, "require_membership_of",
2362                                    WINBIND_REQUIRED_MEMBERSHIP);
2363         if (ret) {
2364                 return ret;
2365         }
2366         return get_conf_item_string(ctx, "require-membership-of",
2367                                     WINBIND_REQUIRED_MEMBERSHIP);
2368 }
2369
2370 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2371 {
2372         int ret;
2373         ret = get_config_item_int(ctx, "warn_pwd_expire",
2374                                   WINBIND_WARN_PWD_EXPIRE);
2375         /* no or broken setting */
2376         if (ret <= 0) {
2377                 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2378         }
2379         return ret;
2380 }
2381
2382 /**
2383  * Retrieve the winbind separator.
2384  *
2385  * @param ctx PAM winbind context.
2386  *
2387  * @return string separator character. NULL on failure.
2388  */
2389
2390 static char winbind_get_separator(struct pwb_context *ctx)
2391 {
2392         wbcErr wbc_status;
2393         static struct wbcInterfaceDetails *details = NULL;
2394
2395         wbc_status = wbcInterfaceDetails(&details);
2396         if (!WBC_ERROR_IS_OK(wbc_status)) {
2397                 _pam_log(ctx, LOG_ERR,
2398                          "Could not retrieve winbind interface details: %s",
2399                          wbcErrorString(wbc_status));
2400                 return '\0';
2401         }
2402
2403         if (!details) {
2404                 return '\0';
2405         }
2406
2407         return details->winbind_separator;
2408 }
2409
2410
2411 /**
2412  * Convert a upn to a name.
2413  *
2414  * @param ctx PAM winbind context.
2415  * @param upn  USer UPN to be trabslated.
2416  *
2417  * @return converted name. NULL pointer on failure. Caller needs to free.
2418  */
2419
2420 static char* winbind_upn_to_username(struct pwb_context *ctx,
2421                                      const char *upn)
2422 {
2423         char sep;
2424         wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2425         struct wbcDomainSid sid;
2426         enum wbcSidType type;
2427         char *domain;
2428         char *name;
2429         char *p;
2430
2431         /* This cannot work when the winbind separator = @ */
2432
2433         sep = winbind_get_separator(ctx);
2434         if (!sep || sep == '@') {
2435                 return NULL;
2436         }
2437
2438         name = talloc_strdup(ctx, upn);
2439         if (!name) {
2440                 return NULL;
2441         }
2442         if ((p = strchr(name, '@')) != NULL) {
2443                 *p = 0;
2444                 domain = p + 1;
2445         }
2446
2447         /* Convert the UPN to a SID */
2448
2449         wbc_status = wbcLookupName(domain, name, &sid, &type);
2450         if (!WBC_ERROR_IS_OK(wbc_status)) {
2451                 return NULL;
2452         }
2453
2454         /* Convert the the SID back to the sAMAccountName */
2455
2456         wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2457         if (!WBC_ERROR_IS_OK(wbc_status)) {
2458                 return NULL;
2459         }
2460
2461         return talloc_asprintf(ctx, "%s\\%s", domain, name);
2462 }
2463
2464 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2465                          int argc, const char **argv)
2466 {
2467         int retval = PAM_SUCCESS;
2468         struct pwb_context *ctx = NULL;
2469         struct wbcLogoffUserParams logoff;
2470         struct wbcAuthErrorInfo *error = NULL;
2471         const char *user;
2472         wbcErr wbc_status = WBC_ERR_SUCCESS;
2473
2474         ZERO_STRUCT(logoff);
2475
2476         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2477         if (retval) {
2478                 goto out;
2479         }
2480
2481         _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2482
2483         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2484
2485                 /* destroy the ccache here */
2486
2487                 uint32_t wbc_flags = 0;
2488                 const char *ccname = NULL;
2489                 struct passwd *pwd = NULL;
2490
2491                 retval = pam_get_user(pamh, &user, _("Username: "));
2492                 if (retval) {
2493                         _pam_log(ctx, LOG_ERR,
2494                                  "could not identify user");
2495                         goto out;
2496                 }
2497
2498                 if (user == NULL) {
2499                         _pam_log(ctx, LOG_ERR,
2500                                  "username was NULL!");
2501                         retval = PAM_USER_UNKNOWN;
2502                         goto out;
2503                 }
2504
2505                 _pam_log_debug(ctx, LOG_DEBUG,
2506                                "username [%s] obtained", user);
2507
2508                 ccname = pam_getenv(pamh, "KRB5CCNAME");
2509                 if (ccname == NULL) {
2510                         _pam_log_debug(ctx, LOG_DEBUG,
2511                                        "user has no KRB5CCNAME environment");
2512                 }
2513
2514                 pwd = getpwnam(user);
2515                 if (pwd == NULL) {
2516                         retval = PAM_USER_UNKNOWN;
2517                         goto out;
2518                 }
2519
2520                 wbc_flags = WBFLAG_PAM_KRB5 |
2521                         WBFLAG_PAM_CONTACT_TRUSTDOM;
2522
2523                 logoff.username         = user;
2524
2525                 if (ccname) {
2526                         wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2527                                                      &logoff.blobs,
2528                                                      "ccfilename",
2529                                                      0,
2530                                                      (uint8_t *)ccname,
2531                                                      strlen(ccname)+1);
2532                         if (!WBC_ERROR_IS_OK(wbc_status)) {
2533                                 goto out;
2534                         }
2535                 }
2536
2537                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2538                                              &logoff.blobs,
2539                                              "flags",
2540                                              0,
2541                                              (uint8_t *)&wbc_flags,
2542                                              sizeof(wbc_flags));
2543                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2544                         goto out;
2545                 }
2546
2547                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2548                                              &logoff.blobs,
2549                                              "user_uid",
2550                                              0,
2551                                              (uint8_t *)&pwd->pw_uid,
2552                                              sizeof(pwd->pw_uid));
2553                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2554                         goto out;
2555                 }
2556
2557                 wbc_status = wbcLogoffUserEx(&logoff, &error);
2558                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2559                                                      user, "wbcLogoffUser");
2560                 wbcFreeMemory(error);
2561                 wbcFreeMemory(logoff.blobs);
2562                 logoff.blobs = NULL;
2563
2564                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2565                         _pam_log(ctx, LOG_INFO,
2566                                  "failed to logoff user %s: %s\n",
2567                                          user, wbcErrorString(wbc_status));
2568                 }
2569         }
2570
2571 out:
2572         if (logoff.blobs) {
2573                 wbcFreeMemory(logoff.blobs);
2574         }
2575
2576         if (!WBC_ERROR_IS_OK(wbc_status)) {
2577                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2578                      user, "wbcLogoffUser");
2579         }
2580
2581         /*
2582          * Delete the krb5 ccname variable from the PAM environment
2583          * if it was set by winbind.
2584          */
2585         if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2586                 pam_putenv(pamh, "KRB5CCNAME");
2587         }
2588
2589         _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2590
2591         TALLOC_FREE(ctx);
2592
2593         return retval;
2594 }
2595
2596 PAM_EXTERN
2597 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2598                         int argc, const char **argv)
2599 {
2600         const char *username;
2601         const char *password;
2602         const char *member = NULL;
2603         const char *cctype = NULL;
2604         int warn_pwd_expire;
2605         int retval = PAM_AUTH_ERR;
2606         char *username_ret = NULL;
2607         char *new_authtok_required = NULL;
2608         char *real_username = NULL;
2609         struct pwb_context *ctx = NULL;
2610
2611         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2612         if (retval) {
2613                 goto out;
2614         }
2615
2616         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2617
2618         /* Get the username */
2619         retval = pam_get_user(pamh, &username, NULL);
2620         if ((retval != PAM_SUCCESS) || (!username)) {
2621                 _pam_log_debug(ctx, LOG_DEBUG,
2622                                "can not get the username");
2623                 retval = PAM_SERVICE_ERR;
2624                 goto out;
2625         }
2626
2627
2628 #if defined(AIX)
2629         /* Decode the user name since AIX does not support logn user
2630            names by default.  The name is encoded as _#uid.  */
2631
2632         if (username[0] == '_') {
2633                 uid_t id = atoi(&username[1]);
2634                 struct passwd *pw = NULL;
2635
2636                 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2637                         real_username = strdup(pw->pw_name);
2638                 }
2639         }
2640 #endif
2641
2642         if (!real_username) {
2643                 /* Just making a copy of the username we got from PAM */
2644                 if ((real_username = strdup(username)) == NULL) {
2645                         _pam_log_debug(ctx, LOG_DEBUG,
2646                                        "memory allocation failure when copying "
2647                                        "username");
2648                         retval = PAM_SERVICE_ERR;
2649                         goto out;
2650                 }
2651         }
2652
2653         /* Maybe this was a UPN */
2654
2655         if (strchr(real_username, '@') != NULL) {
2656                 char *samaccountname = NULL;
2657
2658                 samaccountname = winbind_upn_to_username(ctx,
2659                                                          real_username);
2660                 if (samaccountname) {
2661                         free(real_username);
2662                         real_username = strdup(samaccountname);
2663                 }
2664         }
2665
2666         retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2667                                         _("Password: "), NULL,
2668                                         &password);
2669
2670         if (retval != PAM_SUCCESS) {
2671                 _pam_log(ctx, LOG_ERR,
2672                          "Could not retrieve user's password");
2673                 retval = PAM_AUTHTOK_ERR;
2674                 goto out;
2675         }
2676
2677         /* Let's not give too much away in the log file */
2678
2679 #ifdef DEBUG_PASSWORD
2680         _pam_log_debug(ctx, LOG_INFO,
2681                        "Verify user '%s' with password '%s'",
2682                        real_username, password);
2683 #else
2684         _pam_log_debug(ctx, LOG_INFO,
2685                        "Verify user '%s'", real_username);
2686 #endif
2687
2688         member = get_member_from_config(ctx);
2689         cctype = get_krb5_cc_type_from_config(ctx);
2690         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2691
2692         /* Now use the username to look up password */
2693         retval = winbind_auth_request(ctx, real_username, password,
2694                                       member, cctype, warn_pwd_expire,
2695                                       NULL, NULL, NULL,
2696                                       NULL, &username_ret);
2697
2698         if (retval == PAM_NEW_AUTHTOK_REQD ||
2699             retval == PAM_AUTHTOK_EXPIRED) {
2700
2701                 char *new_authtok_required_during_auth = NULL;
2702
2703                 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2704                 if (!new_authtok_required) {
2705                         retval = PAM_BUF_ERR;
2706                         goto out;
2707                 }
2708
2709                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2710                              new_authtok_required,
2711                              _pam_winbind_cleanup_func);
2712
2713                 retval = PAM_SUCCESS;
2714
2715                 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2716                 if (!new_authtok_required_during_auth) {
2717                         retval = PAM_BUF_ERR;
2718                         goto out;
2719                 }
2720
2721                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2722                              new_authtok_required_during_auth,
2723                              _pam_winbind_cleanup_func);
2724
2725                 goto out;
2726         }
2727
2728 out:
2729         if (username_ret) {
2730                 pam_set_item (pamh, PAM_USER, username_ret);
2731                 _pam_log_debug(ctx, LOG_INFO,
2732                                "Returned user was '%s'", username_ret);
2733                 free(username_ret);
2734         }
2735
2736         if (real_username) {
2737                 free(real_username);
2738         }
2739
2740         if (!new_authtok_required) {
2741                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2742         }
2743
2744         if (retval != PAM_SUCCESS) {
2745                 _pam_free_data_info3(pamh);
2746         }
2747
2748         _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2749
2750         TALLOC_FREE(ctx);
2751
2752         return retval;
2753 }
2754
2755 PAM_EXTERN
2756 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2757                    int argc, const char **argv)
2758 {
2759         int ret = PAM_SYSTEM_ERR;
2760         struct pwb_context *ctx = NULL;
2761
2762         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2763         if (ret) {
2764                 goto out;
2765         }
2766
2767         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2768
2769         switch (flags & ~PAM_SILENT) {
2770
2771                 case PAM_DELETE_CRED:
2772                         ret = _pam_delete_cred(pamh, flags, argc, argv);
2773                         break;
2774                 case PAM_REFRESH_CRED:
2775                         _pam_log_debug(ctx, LOG_WARNING,
2776                                        "PAM_REFRESH_CRED not implemented");
2777                         ret = PAM_SUCCESS;
2778                         break;
2779                 case PAM_REINITIALIZE_CRED:
2780                         _pam_log_debug(ctx, LOG_WARNING,
2781                                        "PAM_REINITIALIZE_CRED not implemented");
2782                         ret = PAM_SUCCESS;
2783                         break;
2784                 case PAM_ESTABLISH_CRED:
2785                         _pam_log_debug(ctx, LOG_WARNING,
2786                                        "PAM_ESTABLISH_CRED not implemented");
2787                         ret = PAM_SUCCESS;
2788                         break;
2789                 default:
2790                         ret = PAM_SYSTEM_ERR;
2791                         break;
2792         }
2793
2794  out:
2795
2796         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2797
2798         TALLOC_FREE(ctx);
2799
2800         return ret;
2801 }
2802
2803 /*
2804  * Account management. We want to verify that the account exists
2805  * before returning PAM_SUCCESS
2806  */
2807 PAM_EXTERN
2808 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2809                    int argc, const char **argv)
2810 {
2811         const char *username;
2812         int ret = PAM_USER_UNKNOWN;
2813         void *tmp = NULL;
2814         struct pwb_context *ctx = NULL;
2815
2816         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2817         if (ret) {
2818                 goto out;
2819         }
2820
2821         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2822
2823
2824         /* Get the username */
2825         ret = pam_get_user(pamh, &username, NULL);
2826         if ((ret != PAM_SUCCESS) || (!username)) {
2827                 _pam_log_debug(ctx, LOG_DEBUG,
2828                                "can not get the username");
2829                 ret = PAM_SERVICE_ERR;
2830                 goto out;
2831         }
2832
2833         /* Verify the username */
2834         ret = valid_user(ctx, username);
2835         switch (ret) {
2836         case -1:
2837                 /* some sort of system error. The log was already printed */
2838                 ret = PAM_SERVICE_ERR;
2839                 goto out;
2840         case 1:
2841                 /* the user does not exist */
2842                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2843                                username);
2844                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2845                         ret = PAM_IGNORE;
2846                         goto out;
2847                 }
2848                 ret = PAM_USER_UNKNOWN;
2849                 goto out;
2850         case 0:
2851                 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2852                              (const void **)&tmp);
2853                 if (tmp != NULL) {
2854                         ret = atoi((const char *)tmp);
2855                         switch (ret) {
2856                         case PAM_AUTHTOK_EXPIRED:
2857                                 /* fall through, since new token is required in this case */
2858                         case PAM_NEW_AUTHTOK_REQD:
2859                                 _pam_log(ctx, LOG_WARNING,
2860                                          "pam_sm_acct_mgmt success but %s is set",
2861                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
2862                                 _pam_log(ctx, LOG_NOTICE,
2863                                          "user '%s' needs new password",
2864                                          username);
2865                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2866                                 ret = PAM_NEW_AUTHTOK_REQD;
2867                                 goto out;
2868                         default:
2869                                 _pam_log(ctx, LOG_WARNING,
2870                                          "pam_sm_acct_mgmt success");
2871                                 _pam_log(ctx, LOG_NOTICE,
2872                                          "user '%s' granted access", username);
2873                                 ret = PAM_SUCCESS;
2874                                 goto out;
2875                         }
2876                 }
2877
2878                 /* Otherwise, the authentication looked good */
2879                 _pam_log(ctx, LOG_NOTICE,
2880                          "user '%s' granted access", username);
2881                 ret = PAM_SUCCESS;
2882                 goto out;
2883         default:
2884                 /* we don't know anything about this return value */
2885                 _pam_log(ctx, LOG_ERR,
2886                          "internal module error (ret = %d, user = '%s')",
2887                          ret, username);
2888                 ret = PAM_SERVICE_ERR;
2889                 goto out;
2890         }
2891
2892         /* should not be reached */
2893         ret = PAM_IGNORE;
2894
2895  out:
2896
2897         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2898
2899         TALLOC_FREE(ctx);
2900
2901         return ret;
2902 }
2903
2904 PAM_EXTERN
2905 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2906                         int argc, const char **argv)
2907 {
2908         int ret = PAM_SUCCESS;
2909         struct pwb_context *ctx = NULL;
2910
2911         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2912         if (ret) {
2913                 goto out;
2914         }
2915
2916         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2917
2918         if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2919                 /* check and create homedir */
2920                 ret = _pam_mkhomedir(ctx);
2921         }
2922  out:
2923         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2924
2925         TALLOC_FREE(ctx);
2926
2927         return ret;
2928 }
2929
2930 PAM_EXTERN
2931 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2932                          int argc, const char **argv)
2933 {
2934         int ret = PAM_SUCCESS;
2935         struct pwb_context *ctx = NULL;
2936
2937         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2938         if (ret) {
2939                 goto out;
2940         }
2941
2942         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2943
2944 out:
2945         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2946
2947         TALLOC_FREE(ctx);
2948
2949         return ret;
2950 }
2951
2952 /**
2953  * evaluate whether we need to re-authenticate with kerberos after a
2954  * password change
2955  *
2956  * @param ctx PAM winbind context.
2957  * @param user The username
2958  *
2959  * @return boolean Returns true if required, false if not.
2960  */
2961
2962 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2963                                                    const char *user)
2964 {
2965
2966         /* Make sure that we only do this if a) the chauthtok got initiated
2967          * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2968          * later password change via the "passwd" command if done by the user
2969          * itself
2970          * NB. If we login from gdm or xdm and the password expires,
2971          * we change the password, but there is no memory cache.
2972          * Thus, even for passthrough login, we should do the
2973          * authentication again to update memory cache.
2974          * --- BoYang
2975          * */
2976
2977         char *new_authtok_reqd_during_auth = NULL;
2978         struct passwd *pwd = NULL;
2979
2980         _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2981                       &new_authtok_reqd_during_auth);
2982         pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2983                      NULL, NULL);
2984
2985         if (new_authtok_reqd_during_auth) {
2986                 return true;
2987         }
2988
2989         pwd = getpwnam(user);
2990         if (!pwd) {
2991                 return false;
2992         }
2993
2994         if (getuid() == pwd->pw_uid) {
2995                 return true;
2996         }
2997
2998         return false;
2999 }
3000
3001
3002 PAM_EXTERN
3003 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
3004                      int argc, const char **argv)
3005 {
3006         unsigned int lctrl;
3007         int ret;
3008         bool cached_login = false;
3009
3010         /* <DO NOT free() THESE> */
3011         const char *user;
3012         char *pass_old, *pass_new;
3013         /* </DO NOT free() THESE> */
3014
3015         char *Announce;
3016
3017         int retry = 0;
3018         char *username_ret = NULL;
3019         struct wbcAuthErrorInfo *error = NULL;
3020         struct pwb_context *ctx = NULL;
3021
3022         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
3023         if (ret) {
3024                 goto out;
3025         }
3026
3027         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
3028
3029         cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
3030
3031         /* clearing offline bit for auth */
3032         ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
3033
3034         /*
3035          * First get the name of a user
3036          */
3037         ret = pam_get_user(pamh, &user, _("Username: "));
3038         if (ret) {
3039                 _pam_log(ctx, LOG_ERR,
3040                          "password - could not identify user");
3041                 goto out;
3042         }
3043
3044         if (user == NULL) {
3045                 _pam_log(ctx, LOG_ERR, "username was NULL!");
3046                 ret = PAM_USER_UNKNOWN;
3047                 goto out;
3048         }
3049
3050         _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
3051
3052         /* check if this is really a user in winbindd, not only in NSS */
3053         ret = valid_user(ctx, user);
3054         switch (ret) {
3055                 case 1:
3056                         ret = PAM_USER_UNKNOWN;
3057                         goto out;
3058                 case -1:
3059                         ret = PAM_SYSTEM_ERR;
3060                         goto out;
3061                 default:
3062                         break;
3063         }
3064
3065         /*
3066          * obtain and verify the current password (OLDAUTHTOK) for
3067          * the user.
3068          */
3069
3070         if (flags & PAM_PRELIM_CHECK) {
3071                 time_t pwdlastset_prelim = 0;
3072
3073                 /* instruct user what is happening */
3074
3075 #define greeting _("Changing password for")
3076                 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
3077                 if (!Announce) {
3078                         _pam_log(ctx, LOG_CRIT,
3079                                  "password - out of memory");
3080                         ret = PAM_BUF_ERR;
3081                         goto out;
3082                 }
3083 #undef greeting
3084
3085                 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
3086                 ret = _winbind_read_password(ctx, lctrl,
3087                                                 Announce,
3088                                                 _("(current) NT password: "),
3089                                                 NULL,
3090                                                 (const char **) &pass_old);
3091                 TALLOC_FREE(Announce);
3092                 if (ret != PAM_SUCCESS) {
3093                         _pam_log(ctx, LOG_NOTICE,
3094                                  "password - (old) token not obtained");
3095                         goto out;
3096                 }
3097
3098                 /* verify that this is the password for this user */
3099
3100                 ret = winbind_auth_request(ctx, user, pass_old,
3101                                            NULL, NULL, 0,
3102                                            &error, NULL, NULL,
3103                                            &pwdlastset_prelim, NULL);
3104
3105                 if (ret != PAM_ACCT_EXPIRED &&
3106                     ret != PAM_AUTHTOK_EXPIRED &&
3107                     ret != PAM_NEW_AUTHTOK_REQD &&
3108                     ret != PAM_SUCCESS) {
3109                         pass_old = NULL;
3110                         goto out;
3111                 }
3112
3113                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3114                              (void *)pwdlastset_prelim, NULL);
3115
3116                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3117                                    (const void *) pass_old);
3118                 pass_old = NULL;
3119                 if (ret != PAM_SUCCESS) {
3120                         _pam_log(ctx, LOG_CRIT,
3121                                  "failed to set PAM_OLDAUTHTOK");
3122                 }
3123         } else if (flags & PAM_UPDATE_AUTHTOK) {
3124
3125                 time_t pwdlastset_update = 0;
3126
3127                 /*
3128                  * obtain the proposed password
3129                  */
3130
3131                 /*
3132                  * get the old token back.
3133                  */
3134
3135                 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
3136
3137                 if (ret != PAM_SUCCESS) {
3138                         _pam_log(ctx, LOG_NOTICE,
3139                                  "user not authenticated");
3140                         goto out;
3141                 }
3142
3143                 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3144
3145                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3146                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3147                 }
3148                 retry = 0;
3149                 ret = PAM_AUTHTOK_ERR;
3150                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3151                         /*
3152                          * use_authtok is to force the use of a previously entered
3153                          * password -- needed for pluggable password strength checking
3154                          */
3155
3156                         ret = _winbind_read_password(ctx, lctrl,
3157                                                      NULL,
3158                                                      _("Enter new NT password: "),
3159                                                      _("Retype new NT password: "),
3160                                                      (const char **)&pass_new);
3161
3162                         if (ret != PAM_SUCCESS) {
3163                                 _pam_log_debug(ctx, LOG_ALERT,
3164                                                "password - "
3165                                                "new password not obtained");
3166                                 pass_old = NULL;/* tidy up */
3167                                 goto out;
3168                         }
3169
3170                         /*
3171                          * At this point we know who the user is and what they
3172                          * propose as their new password. Verify that the new
3173                          * password is acceptable.
3174                          */
3175
3176                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
3177                                 pass_new = NULL;
3178                         }
3179                 }
3180
3181                 /*
3182                  * By reaching here we have approved the passwords and must now
3183                  * rebuild the password database file.
3184                  */
3185                 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3186                               &pwdlastset_update);
3187
3188                 /*
3189                  * if cached creds were enabled, make sure to set the
3190                  * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3191                  * update the cached creds storage - gd
3192                  */
3193                 if (cached_login) {
3194                         ctx->ctrl |= WINBIND_CACHED_LOGIN;
3195                 }
3196
3197                 ret = winbind_chauthtok_request(ctx, user, pass_old,
3198                                                 pass_new, pwdlastset_update);
3199                 if (ret) {
3200                         pass_old = pass_new = NULL;
3201                         goto out;
3202                 }
3203
3204                 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3205
3206                         const char *member = NULL;
3207                         const char *cctype = NULL;
3208                         int warn_pwd_expire;
3209                         struct wbcLogonUserInfo *info = NULL;
3210                         struct wbcUserPasswordPolicyInfo *policy = NULL;
3211
3212                         member = get_member_from_config(ctx);
3213                         cctype = get_krb5_cc_type_from_config(ctx);
3214                         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3215
3216                         /* Keep WINBIND_CACHED_LOGIN bit for
3217                          * authentication after changing the password.
3218                          * This will update the cached credentials in case
3219                          * that winbindd_dual_pam_chauthtok() fails
3220                          * to update them.
3221                          * --- BoYang
3222                          * */
3223
3224                         ret = winbind_auth_request(ctx, user, pass_new,
3225                                                    member, cctype, 0,
3226                                                    &error, &info, &policy,
3227                                                    NULL, &username_ret);
3228                         pass_old = pass_new = NULL;
3229
3230                         if (ret == PAM_SUCCESS) {
3231
3232                                 struct wbcAuthUserInfo *user_info = NULL;
3233
3234                                 if (info && info->info) {
3235                                         user_info = info->info;
3236                                 }
3237
3238                                 /* warn a user if the password is about to
3239                                  * expire soon */
3240                                 _pam_warn_password_expiry(ctx, user_info, policy,
3241                                                           warn_pwd_expire,
3242                                                           NULL, NULL);
3243
3244                                 /* set some info3 info for other modules in the
3245                                  * stack */
3246                                 _pam_set_data_info3(ctx, user_info);
3247
3248                                 /* put krb5ccname into env */
3249                                 _pam_setup_krb5_env(ctx, info);
3250
3251                                 if (username_ret) {
3252                                         pam_set_item(pamh, PAM_USER,
3253                                                      username_ret);
3254                                         _pam_log_debug(ctx, LOG_INFO,
3255                                                        "Returned user was '%s'",
3256                                                        username_ret);
3257                                         free(username_ret);
3258                                 }
3259
3260                         }
3261
3262                         if (info && info->blobs) {
3263                                 wbcFreeMemory(info->blobs);
3264                         }
3265                         wbcFreeMemory(info);
3266                         wbcFreeMemory(policy);
3267
3268                         goto out;
3269                 }
3270         } else {
3271                 ret = PAM_SERVICE_ERR;
3272         }
3273
3274 out:
3275         {
3276                 /* Deal with offline errors. */
3277                 int i;
3278                 const char *codes[] = {
3279                         "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3280                         "NT_STATUS_NO_LOGON_SERVERS",
3281                         "NT_STATUS_ACCESS_DENIED"
3282                 };
3283
3284                 for (i=0; i<ARRAY_SIZE(codes); i++) {
3285                         int _ret;
3286                         if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3287                                 break;
3288                         }
3289                 }
3290         }
3291
3292         wbcFreeMemory(error);
3293
3294         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3295
3296         TALLOC_FREE(ctx);
3297
3298         return ret;
3299 }
3300
3301 #ifdef PAM_STATIC
3302
3303 /* static module data */
3304
3305 struct pam_module _pam_winbind_modstruct = {
3306         MODULE_NAME,
3307         pam_sm_authenticate,
3308         pam_sm_setcred,
3309         pam_sm_acct_mgmt,
3310         pam_sm_open_session,
3311         pam_sm_close_session,
3312         pam_sm_chauthtok
3313 };
3314
3315 #endif
3316
3317 /*
3318  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
3319  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
3320  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3321  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2008
3322  * Copyright (c) Jan Rêkorajski 1999.
3323  * Copyright (c) Andrew G. Morgan 1996-8.
3324  * Copyright (c) Alex O. Yuriev, 1996.
3325  * Copyright (c) Cristian Gafton 1996.
3326  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3327  *
3328  * Redistribution and use in source and binary forms, with or without
3329  * modification, are permitted provided that the following conditions
3330  * are met:
3331  * 1. Redistributions of source code must retain the above copyright
3332  *    notice, and the entire permission notice in its entirety,
3333  *    including the disclaimer of warranties.
3334  * 2. Redistributions in binary form must reproduce the above copyright
3335  *    notice, this list of conditions and the following disclaimer in the
3336  *    documentation and/or other materials provided with the distribution.
3337  * 3. The name of the author may not be used to endorse or promote
3338  *    products derived from this software without specific prior
3339  *    written permission.
3340  *
3341  * ALTERNATIVELY, this product may be distributed under the terms of
3342  * the GNU Public License, in which case the provisions of the GPL are
3343  * required INSTEAD OF the above restrictions.  (This clause is
3344  * necessary due to a potential bad interaction between the GPL and
3345  * the restrictions contained in a BSD-style copyright.)
3346  *
3347  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3348  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3349  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3350  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3351  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3352  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3353  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3354  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3355  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3356  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3357  * OF THE POSSIBILITY OF SUCH DAMAGE.
3358  */