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