source/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
  15 static int wbc_error_to_pam_error(wbcErr status)
  16 {
  17         switch (status) {
  18                 case WBC_ERR_SUCCESS:
  19                         return PAM_SUCCESS;
  20                 case WBC_ERR_NOT_IMPLEMENTED:
  21                         return PAM_SERVICE_ERR;
  22                 case WBC_ERR_UNKNOWN_FAILURE:
  23                         break;
  24                 case WBC_ERR_NO_MEMORY:
  25                         return PAM_BUF_ERR;
  26                 case WBC_ERR_INVALID_SID:
  27                 case WBC_ERR_INVALID_PARAM:
  28                         break;
  29                 case WBC_ERR_WINBIND_NOT_AVAILABLE:
  30                         return PAM_AUTHINFO_UNAVAIL;
  31                 case WBC_ERR_DOMAIN_NOT_FOUND:
  32                         return PAM_AUTHINFO_UNAVAIL;
  33                 case WBC_ERR_INVALID_RESPONSE:
  34                         return PAM_BUF_ERR;
  35                 case WBC_ERR_NSS_ERROR:
  36                         return PAM_USER_UNKNOWN;
  37                 case WBC_ERR_AUTH_ERROR:
  38                         return PAM_AUTH_ERR;
  39                 case WBC_ERR_UNKNOWN_USER:
  40                         return PAM_USER_UNKNOWN;
  41                 case WBC_ERR_UNKNOWN_GROUP:
  42                         return PAM_USER_UNKNOWN;
  43                 case WBC_ERR_PWD_CHANGE_FAILED:
  44                         break;
  45         }
  46
  47         /* be paranoid */
  48         return PAM_AUTH_ERR;
  49 }
  50
  51 static const char *_pam_error_code_str(int err)
  52 {
  53         switch (err) {
  54                 case PAM_SUCCESS:
  55                         return "PAM_SUCCESS";
  56                 case PAM_OPEN_ERR:
  57                         return "PAM_OPEN_ERR";
  58                 case PAM_SYMBOL_ERR:
  59                         return "PAM_SYMBOL_ERR";
  60                 case PAM_SERVICE_ERR:
  61                         return "PAM_SERVICE_ERR";
  62                 case PAM_SYSTEM_ERR:
  63                         return "PAM_SYSTEM_ERR";
  64                 case PAM_BUF_ERR:
  65                         return "PAM_BUF_ERR";
  66                 case PAM_PERM_DENIED:
  67                         return "PAM_PERM_DENIED";
  68                 case PAM_AUTH_ERR:
  69                         return "PAM_AUTH_ERR";
  70                 case PAM_CRED_INSUFFICIENT:
  71                         return "PAM_CRED_INSUFFICIENT";
  72                 case PAM_AUTHINFO_UNAVAIL:
  73                         return "PAM_AUTHINFO_UNAVAIL";
  74                 case PAM_USER_UNKNOWN:
  75                         return "PAM_USER_UNKNOWN";
  76                 case PAM_MAXTRIES:
  77                         return "PAM_MAXTRIES";
  78                 case PAM_NEW_AUTHTOK_REQD:
  79                         return "PAM_NEW_AUTHTOK_REQD";
  80                 case PAM_ACCT_EXPIRED:
  81                         return "PAM_ACCT_EXPIRED";
  82                 case PAM_SESSION_ERR:
  83                         return "PAM_SESSION_ERR";
  84                 case PAM_CRED_UNAVAIL:
  85                         return "PAM_CRED_UNAVAIL";
  86                 case PAM_CRED_EXPIRED:
  87                         return "PAM_CRED_EXPIRED";
  88                 case PAM_CRED_ERR:
  89                         return "PAM_CRED_ERR";
  90                 case PAM_NO_MODULE_DATA:
  91                         return "PAM_NO_MODULE_DATA";
  92                 case PAM_CONV_ERR:
  93                         return "PAM_CONV_ERR";
  94                 case PAM_AUTHTOK_ERR:
  95                         return "PAM_AUTHTOK_ERR";
  96                 case PAM_AUTHTOK_RECOVER_ERR:
  97                         return "PAM_AUTHTOK_RECOVER_ERR";
  98                 case PAM_AUTHTOK_LOCK_BUSY:
  99                         return "PAM_AUTHTOK_LOCK_BUSY";
 100                 case PAM_AUTHTOK_DISABLE_AGING:
 101                         return "PAM_AUTHTOK_DISABLE_AGING";
 102                 case PAM_TRY_AGAIN:
 103                         return "PAM_TRY_AGAIN";
 104                 case PAM_IGNORE:
 105                         return "PAM_IGNORE";
 106                 case PAM_ABORT:
 107                         return "PAM_ABORT";
 108                 case PAM_AUTHTOK_EXPIRED:
 109                         return "PAM_AUTHTOK_EXPIRED";
 110 #ifdef PAM_MODULE_UNKNOWN
 111                 case PAM_MODULE_UNKNOWN:
 112                         return "PAM_MODULE_UNKNOWN";
 113 #endif
 114 #ifdef PAM_BAD_ITEM
 115                 case PAM_BAD_ITEM:
 116                         return "PAM_BAD_ITEM";
 117 #endif
 118 #ifdef PAM_CONV_AGAIN
 119                 case PAM_CONV_AGAIN:
 120                         return "PAM_CONV_AGAIN";
 121 #endif
 122 #ifdef PAM_INCOMPLETE
 123                 case PAM_INCOMPLETE:
 124                         return "PAM_INCOMPLETE";
 125 #endif
 126                 default:
 127                         return NULL;
 128         }
 129 }
 130
 131 #define _PAM_LOG_FUNCTION_ENTER(function, ctx) \
 132         do { \
 133                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] ENTER: " \
 134                                function " (flags: 0x%04x)", ctx->pamh, ctx->flags); \
 135                 _pam_log_state(ctx); \
 136         } while (0)
 137
 138 #define _PAM_LOG_FUNCTION_LEAVE(function, ctx, retval) \
 139         do { \
 140                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] LEAVE: " \
 141                                function " returning %d (%s)", ctx->pamh, retval, \
 142                                _pam_error_code_str(retval)); \
 143                 _pam_log_state(ctx); \
 144         } while (0)
 145
 146 /* data tokens */
 147
 148 #define MAX_PASSWD_TRIES        3
 149
 150 #ifdef HAVE_GETTEXT
 151 static char initialized = 0;
 152
 153 static inline void textdomain_init(void);
 154 static inline void textdomain_init(void)
 155 {
 156         if (!initialized) {
 157                 bindtextdomain(MODULE_NAME, dyn_LOCALEDIR);
 158                 initialized = 1;
 159         }
 160         return;
 161 }
 162 #endif
 163
 164
 165 /*
 166  * Work around the pam API that has functions with void ** as parameters
 167  * These lead to strict aliasing warnings with gcc.
 168  */
 169 static int _pam_get_item(const pam_handle_t *pamh,
 170                          int item_type,
 171                          const void *_item)
 172 {
 173         const void **item = (const void **)_item;
 174         return pam_get_item(pamh, item_type, item);
 175 }
 176 static int _pam_get_data(const pam_handle_t *pamh,
 177                          const char *module_data_name,
 178                          const void *_data)
 179 {
 180         const void **data = (const void **)_data;
 181         return pam_get_data(pamh, module_data_name, data);
 182 }
 183
 184 /* some syslogging */
 185
 186 #ifdef HAVE_PAM_VSYSLOG
 187 static void _pam_log_int(const pam_handle_t *pamh,
 188                          int err,
 189                          const char *format,
 190                          va_list args)
 191 {
 192         pam_vsyslog(pamh, err, format, args);
 193 }
 194 #else
 195 static void _pam_log_int(const pam_handle_t *pamh,
 196                          int err,
 197                          const char *format,
 198                          va_list args)
 199 {
 200         char *format2 = NULL;
 201         const char *service;
 202
 203         _pam_get_item(pamh, PAM_SERVICE, &service);
 204
 205         format2 = (char *)malloc(strlen(MODULE_NAME)+strlen(format)+strlen(service)+5);
 206         if (format2 == NULL) {
 207                 /* what else todo ? */
 208                 vsyslog(err, format, args);
 209                 return;
 210         }
 211
 212         sprintf(format2, "%s(%s): %s", MODULE_NAME, service, format);
 213         vsyslog(err, format2, args);
 214         SAFE_FREE(format2);
 215 }
 216 #endif /* HAVE_PAM_VSYSLOG */
 217
 218 static bool _pam_log_is_silent(int ctrl)
 219 {
 220         return on(ctrl, WINBIND_SILENT);
 221 }
 222
 223 static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 224 static void _pam_log(struct pwb_context *r, int err, const char *format, ...)
 225 {
 226         va_list args;
 227
 228         if (_pam_log_is_silent(r->ctrl)) {
 229                 return;
 230         }
 231
 232         va_start(args, format);
 233         _pam_log_int(r->pamh, err, format, args);
 234         va_end(args);
 235 }
 236 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 237 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 238 {
 239         va_list args;
 240
 241         if (_pam_log_is_silent(ctrl)) {
 242                 return;
 243         }
 244
 245         va_start(args, format);
 246         _pam_log_int(pamh, err, format, args);
 247         va_end(args);
 248 }
 249
 250 static bool _pam_log_is_debug_enabled(int ctrl)
 251 {
 252         if (ctrl == -1) {
 253                 return false;
 254         }
 255
 256         if (_pam_log_is_silent(ctrl)) {
 257                 return false;
 258         }
 259
 260         if (!(ctrl & WINBIND_DEBUG_ARG)) {
 261                 return false;
 262         }
 263
 264         return true;
 265 }
 266
 267 static bool _pam_log_is_debug_state_enabled(int ctrl)
 268 {
 269         if (!(ctrl & WINBIND_DEBUG_STATE)) {
 270                 return false;
 271         }
 272
 273         return _pam_log_is_debug_enabled(ctrl);
 274 }
 275
 276 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 277 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...)
 278 {
 279         va_list args;
 280
 281         if (!_pam_log_is_debug_enabled(r->ctrl)) {
 282                 return;
 283         }
 284
 285         va_start(args, format);
 286         _pam_log_int(r->pamh, err, format, args);
 287         va_end(args);
 288 }
 289 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 290 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 291 {
 292         va_list args;
 293
 294         if (!_pam_log_is_debug_enabled(ctrl)) {
 295                 return;
 296         }
 297
 298         va_start(args, format);
 299         _pam_log_int(pamh, err, format, args);
 300         va_end(args);
 301 }
 302
 303 static void _pam_log_state_datum(struct pwb_context *ctx,
 304                                  int item_type,
 305                                  const char *key,
 306                                  int is_string)
 307 {
 308         const void *data = NULL;
 309         if (item_type != 0) {
 310                 pam_get_item(ctx->pamh, item_type, &data);
 311         } else {
 312                 pam_get_data(ctx->pamh, key, &data);
 313         }
 314         if (data != NULL) {
 315                 const char *type = (item_type != 0) ? "ITEM" : "DATA";
 316                 if (is_string != 0) {
 317                         _pam_log_debug(ctx, LOG_DEBUG,
 318                                        "[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
 319                                        ctx->pamh, type, key, (const char *)data,
 320                                        data);
 321                 } else {
 322                         _pam_log_debug(ctx, LOG_DEBUG,
 323                                        "[pamh: %p] STATE: %s(%s) = %p",
 324                                        ctx->pamh, type, key, data);
 325                 }
 326         }
 327 }
 328
 329 #define _PAM_LOG_STATE_DATA_POINTER(ctx, module_data_name) \
 330         _pam_log_state_datum(ctx, 0, module_data_name, 0)
 331
 332 #define _PAM_LOG_STATE_DATA_STRING(ctx, module_data_name) \
 333         _pam_log_state_datum(ctx, 0, module_data_name, 1)
 334
 335 #define _PAM_LOG_STATE_ITEM_POINTER(ctx, item_type) \
 336         _pam_log_state_datum(ctx, item_type, #item_type, 0)
 337
 338 #define _PAM_LOG_STATE_ITEM_STRING(ctx, item_type) \
 339         _pam_log_state_datum(ctx, item_type, #item_type, 1)
 340
 341 #ifdef DEBUG_PASSWORD
 342 #define _LOG_PASSWORD_AS_STRING 1
 343 #else
 344 #define _LOG_PASSWORD_AS_STRING 0
 345 #endif
 346
 347 #define _PAM_LOG_STATE_ITEM_PASSWORD(ctx, item_type) \
 348         _pam_log_state_datum(ctx, item_type, #item_type, \
 349                              _LOG_PASSWORD_AS_STRING)
 350
 351 static void _pam_log_state(struct pwb_context *ctx)
 352 {
 353         if (!_pam_log_is_debug_state_enabled(ctx->ctrl)) {
 354                 return;
 355         }
 356
 357         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
 358         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
 359         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
 360         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
 361         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
 362         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
 363         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
 364         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
 365         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
 366 #ifdef PAM_FAIL_DELAY
 367         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
 368 #endif
 369 #ifdef PAM_REPOSITORY
 370         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
 371 #endif
 372
 373         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
 374         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
 375         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
 376         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
 377         _PAM_LOG_STATE_DATA_STRING(ctx,
 378                                    PAM_WINBIND_NEW_AUTHTOK_REQD);
 379                                    /* Use atoi to get PAM result code */
 380         _PAM_LOG_STATE_DATA_STRING(ctx,
 381                                    PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
 382         _PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
 383 }
 384
 385 static int _pam_parse(const pam_handle_t *pamh,
 386                       int flags,
 387                       int argc,
 388                       const char **argv,
 389                       dictionary **result_d)
 390 {
 391         int ctrl = 0;
 392         const char *config_file = NULL;
 393         int i;
 394         const char **v;
 395         dictionary *d = NULL;
 396
 397         if (flags & PAM_SILENT) {
 398                 ctrl |= WINBIND_SILENT;
 399         }
 400
 401         for (i=argc,v=argv; i-- > 0; ++v) {
 402                 if (!strncasecmp(*v, "config", strlen("config"))) {
 403                         ctrl |= WINBIND_CONFIG_FILE;
 404                         config_file = v[i];
 405                         break;
 406                 }
 407         }
 408
 409         if (config_file == NULL) {
 410                 config_file = PAM_WINBIND_CONFIG_FILE;
 411         }
 412
 413         d = iniparser_load(config_file);
 414         if (d == NULL) {
 415                 goto config_from_pam;
 416         }
 417
 418         if (iniparser_getboolean(d, "global:debug", false)) {
 419                 ctrl |= WINBIND_DEBUG_ARG;
 420         }
 421
 422         if (iniparser_getboolean(d, "global:debug_state", false)) {
 423                 ctrl |= WINBIND_DEBUG_STATE;
 424         }
 425
 426         if (iniparser_getboolean(d, "global:cached_login", false)) {
 427                 ctrl |= WINBIND_CACHED_LOGIN;
 428         }
 429
 430         if (iniparser_getboolean(d, "global:krb5_auth", false)) {
 431                 ctrl |= WINBIND_KRB5_AUTH;
 432         }
 433
 434         if (iniparser_getboolean(d, "global:silent", false)) {
 435                 ctrl |= WINBIND_SILENT;
 436         }
 437
 438         if (iniparser_getstr(d, "global:krb5_ccache_type") != NULL) {
 439                 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 440         }
 441
 442         if ((iniparser_getstr(d, "global:require-membership-of") != NULL) ||
 443             (iniparser_getstr(d, "global:require_membership_of") != NULL)) {
 444                 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 445         }
 446
 447         if (iniparser_getboolean(d, "global:try_first_pass", false)) {
 448                 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 449         }
 450
 451         if (iniparser_getint(d, "global:warn_pwd_expire", 0)) {
 452                 ctrl |= WINBIND_WARN_PWD_EXPIRE;
 453         }
 454
 455         if (iniparser_getboolean(d, "global:mkhomedir", false)) {
 456                 ctrl |= WINBIND_MKHOMEDIR;
 457         }
 458
 459 config_from_pam:
 460         /* step through arguments */
 461         for (i=argc,v=argv; i-- > 0; ++v) {
 462
 463                 /* generic options */
 464                 if (!strcmp(*v,"debug"))
 465                         ctrl |= WINBIND_DEBUG_ARG;
 466                 else if (!strcasecmp(*v, "debug_state"))
 467                         ctrl |= WINBIND_DEBUG_STATE;
 468                 else if (!strcasecmp(*v, "silent"))
 469                         ctrl |= WINBIND_SILENT;
 470                 else if (!strcasecmp(*v, "use_authtok"))
 471                         ctrl |= WINBIND_USE_AUTHTOK_ARG;
 472                 else if (!strcasecmp(*v, "use_first_pass"))
 473                         ctrl |= WINBIND_USE_FIRST_PASS_ARG;
 474                 else if (!strcasecmp(*v, "try_first_pass"))
 475                         ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 476                 else if (!strcasecmp(*v, "unknown_ok"))
 477                         ctrl |= WINBIND_UNKNOWN_OK_ARG;
 478                 else if (!strncasecmp(*v, "require_membership_of",
 479                                       strlen("require_membership_of")))
 480                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 481                 else if (!strncasecmp(*v, "require-membership-of",
 482                                       strlen("require-membership-of")))
 483                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 484                 else if (!strcasecmp(*v, "krb5_auth"))
 485                         ctrl |= WINBIND_KRB5_AUTH;
 486                 else if (!strncasecmp(*v, "krb5_ccache_type",
 487                                       strlen("krb5_ccache_type")))
 488                         ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 489                 else if (!strcasecmp(*v, "cached_login"))
 490                         ctrl |= WINBIND_CACHED_LOGIN;
 491                 else if (!strcasecmp(*v, "mkhomedir"))
 492                         ctrl |= WINBIND_MKHOMEDIR;
 493                 else {
 494                         __pam_log(pamh, ctrl, LOG_ERR,
 495                                  "pam_parse: unknown option: %s", *v);
 496                         return -1;
 497                 }
 498
 499         }
 500
 501         if (result_d) {
 502                 *result_d = d;
 503         } else {
 504                 if (d) {
 505                         iniparser_freedict(d);
 506                 }
 507         }
 508
 509         return ctrl;
 510 };
 511
 512 static int _pam_winbind_free_context(struct pwb_context *ctx)
 513 {
 514         if (!ctx) {
 515                 return 0;
 516         }
 517
 518         if (ctx->dict) {
 519                 iniparser_freedict(ctx->dict);
 520         }
 521
 522         return 0;
 523 }
 524
 525 static int _pam_winbind_init_context(pam_handle_t *pamh,
 526                                      int flags,
 527                                      int argc,
 528                                      const char **argv,
 529                                      struct pwb_context **ctx_p)
 530 {
 531         struct pwb_context *r = NULL;
 532
 533 #ifdef HAVE_GETTEXT
 534         textdomain_init();
 535 #endif
 536
 537         r = TALLOC_ZERO_P(NULL, struct pwb_context);
 538         if (!r) {
 539                 return PAM_BUF_ERR;
 540         }
 541
 542         talloc_set_destructor(r, _pam_winbind_free_context);
 543
 544         r->pamh = pamh;
 545         r->flags = flags;
 546         r->argc = argc;
 547         r->argv = argv;
 548         r->ctrl = _pam_parse(pamh, flags, argc, argv, &r->dict);
 549         if (r->ctrl == -1) {
 550                 TALLOC_FREE(r);
 551                 return PAM_SYSTEM_ERR;
 552         }
 553
 554         *ctx_p = r;
 555
 556         return PAM_SUCCESS;
 557 }
 558
 559 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
 560                                       void *data,
 561                                       int error_status)
 562 {
 563         int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
 564         if (_pam_log_is_debug_state_enabled(ctrl)) {
 565                 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
 566                                "[pamh: %p] CLEAN: cleaning up PAM data %p "
 567                                "(error_status = %d)", pamh, data,
 568                                error_status);
 569         }
 570         TALLOC_FREE(data);
 571 }
 572
 573
 574 static const struct ntstatus_errors {
 575         const char *ntstatus_string;
 576         const char *error_string;
 577 } ntstatus_errors[] = {
 578         {"NT_STATUS_OK",
 579                 N_("Success")},
 580         {"NT_STATUS_BACKUP_CONTROLLER",
 581                 N_("No primary Domain Controler available")},
 582         {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
 583                 N_("No domain controllers found")},
 584         {"NT_STATUS_NO_LOGON_SERVERS",
 585                 N_("No logon servers")},
 586         {"NT_STATUS_PWD_TOO_SHORT",
 587                 N_("Password too short")},
 588         {"NT_STATUS_PWD_TOO_RECENT",
 589                 N_("The password of this user is too recent to change")},
 590         {"NT_STATUS_PWD_HISTORY_CONFLICT",
 591                 N_("Password is already in password history")},
 592         {"NT_STATUS_PASSWORD_EXPIRED",
 593                 N_("Your password has expired")},
 594         {"NT_STATUS_PASSWORD_MUST_CHANGE",
 595                 N_("You need to change your password now")},
 596         {"NT_STATUS_INVALID_WORKSTATION",
 597                 N_("You are not allowed to logon from this workstation")},
 598         {"NT_STATUS_INVALID_LOGON_HOURS",
 599                 N_("You are not allowed to logon at this time")},
 600         {"NT_STATUS_ACCOUNT_EXPIRED",
 601                 N_("Your account has expired. "
 602                    "Please contact your System administrator")}, /* SCNR */
 603         {"NT_STATUS_ACCOUNT_DISABLED",
 604                 N_("Your account is disabled. "
 605                    "Please contact your System administrator")}, /* SCNR */
 606         {"NT_STATUS_ACCOUNT_LOCKED_OUT",
 607                 N_("Your account has been locked. "
 608                    "Please contact your System administrator")}, /* SCNR */
 609         {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
 610                 N_("Invalid Trust Account")},
 611         {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
 612                 N_("Invalid Trust Account")},
 613         {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
 614                 N_("Invalid Trust Account")},
 615         {"NT_STATUS_ACCESS_DENIED",
 616                 N_("Access is denied")},
 617         {NULL, NULL}
 618 };
 619
 620 static const char *_get_ntstatus_error_string(const char *nt_status_string)
 621 {
 622         int i;
 623         for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
 624                 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
 625                                 nt_status_string)) {
 626                         return _(ntstatus_errors[i].error_string);
 627                 }
 628         }
 629         return NULL;
 630 }
 631
 632 /* --- authentication management functions --- */
 633
 634 /* Attempt a conversation */
 635
 636 static int converse(const pam_handle_t *pamh,
 637                     int nargs,
 638                     struct pam_message **message,
 639                     struct pam_response **response)
 640 {
 641         int retval;
 642         struct pam_conv *conv;
 643
 644         retval = _pam_get_item(pamh, PAM_CONV, &conv);
 645         if (retval == PAM_SUCCESS) {
 646                 retval = conv->conv(nargs,
 647                                     (const struct pam_message **)message,
 648                                     response, conv->appdata_ptr);
 649         }
 650
 651         return retval; /* propagate error status */
 652 }
 653
 654
 655 static int _make_remark(struct pwb_context *ctx,
 656                         int type,
 657                         const char *text)
 658 {
 659         int retval = PAM_SUCCESS;
 660
 661         struct pam_message *pmsg[1], msg[1];
 662         struct pam_response *resp;
 663
 664         if (ctx->flags & WINBIND_SILENT) {
 665                 return PAM_SUCCESS;
 666         }
 667
 668         pmsg[0] = &msg[0];
 669         msg[0].msg = discard_const_p(char, text);
 670         msg[0].msg_style = type;
 671
 672         resp = NULL;
 673         retval = converse(ctx->pamh, 1, pmsg, &resp);
 674
 675         if (resp) {
 676                 _pam_drop_reply(resp, 1);
 677         }
 678         return retval;
 679 }
 680
 681 static int _make_remark_v(struct pwb_context *ctx,
 682                           int type,
 683                           const char *format,
 684                           va_list args)
 685 {
 686         char *var;
 687         int ret;
 688
 689         ret = vasprintf(&var, format, args);
 690         if (ret < 0) {
 691                 _pam_log(ctx, LOG_ERR, "memory allocation failure");
 692                 return ret;
 693         }
 694
 695         ret = _make_remark(ctx, type, var);
 696         SAFE_FREE(var);
 697         return ret;
 698 }
 699
 700 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 701 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
 702 {
 703         int ret;
 704         va_list args;
 705
 706         va_start(args, format);
 707         ret = _make_remark_v(ctx, type, format, args);
 708         va_end(args);
 709         return ret;
 710 }
 711
 712 static int pam_winbind_request_log(struct pwb_context *ctx,
 713                                    int retval,
 714                                    const char *user,
 715                                    const char *fn)
 716 {
 717         switch (retval) {
 718         case PAM_AUTH_ERR:
 719                 /* incorrect password */
 720                 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
 721                          "(incorrect password or invalid membership)", user);
 722                 return retval;
 723         case PAM_ACCT_EXPIRED:
 724                 /* account expired */
 725                 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
 726                          user);
 727                 return retval;
 728         case PAM_AUTHTOK_EXPIRED:
 729                 /* password expired */
 730                 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
 731                          user);
 732                 return retval;
 733         case PAM_NEW_AUTHTOK_REQD:
 734                 /* new password required */
 735                 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
 736                          "required", user);
 737                 return retval;
 738         case PAM_USER_UNKNOWN:
 739                 /* the user does not exist */
 740                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
 741                                user);
 742                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
 743                         return PAM_IGNORE;
 744                 }
 745                 return retval;
 746         case PAM_SUCCESS:
 747                 /* Otherwise, the authentication looked good */
 748                 if (strcmp(fn, "wbcLogonUser") == 0) {
 749                         _pam_log(ctx, LOG_NOTICE,
 750                                  "user '%s' granted access", user);
 751                 } else {
 752                         _pam_log(ctx, LOG_NOTICE,
 753                                  "user '%s' OK", user);
 754                 }
 755                 return retval;
 756         default:
 757                 /* we don't know anything about this return value */
 758                 _pam_log(ctx, LOG_ERR,
 759                          "internal module error (retval = %s(%d), user = '%s')",
 760                         _pam_error_code_str(retval), retval, user);
 761                 return retval;
 762         }
 763 }
 764
 765 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
 766                                        struct wbcAuthErrorInfo *e,
 767                                        wbcErr status,
 768                                        const char *username,
 769                                        const char *fn)
 770 {
 771         int ret = PAM_AUTH_ERR;
 772
 773         if (WBC_ERROR_IS_OK(status)) {
 774                 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
 775                         fn);
 776                 ret = PAM_SUCCESS;
 777                 return pam_winbind_request_log(ctx, ret, username, fn);
 778         }
 779
 780         if (e) {
 781                 if (e->pam_error != PAM_SUCCESS) {
 782                         _pam_log(ctx, LOG_ERR,
 783                                  "request %s failed: %s, "
 784                                  "PAM error: %s (%d), NTSTATUS: %s, "
 785                                  "Error message was: %s",
 786                                  fn,
 787                                  wbcErrorString(status),
 788                                  _pam_error_code_str(e->pam_error),
 789                                  e->pam_error,
 790                                  e->nt_string,
 791                                  e->display_string);
 792                         ret = e->pam_error;
 793                         return pam_winbind_request_log(ctx, ret, username, fn);
 794                 }
 795
 796                 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
 797
 798                 ret = PAM_SERVICE_ERR;
 799                 return pam_winbind_request_log(ctx, ret, username, fn);
 800         }
 801
 802         ret = wbc_error_to_pam_error(status);
 803         return pam_winbind_request_log(ctx, ret, username, fn);
 804 }
 805
 806
 807 /**
 808  * send a password expiry message if required
 809  *
 810  * @param ctx PAM winbind context.
 811  * @param next_change expected (calculated) next expiry date.
 812  * @param already_expired pointer to a boolean to indicate if the password is
 813  *        already expired.
 814  *
 815  * @return boolean Returns true if message has been sent, false if not.
 816  */
 817
 818 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
 819                                               time_t next_change,
 820                                               time_t now,
 821                                               int warn_pwd_expire,
 822                                               bool *already_expired)
 823 {
 824         int days = 0;
 825         struct tm tm_now, tm_next_change;
 826
 827         if (already_expired) {
 828                 *already_expired = false;
 829         }
 830
 831         if (next_change <= now) {
 832                 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
 833                 if (already_expired) {
 834                         *already_expired = true;
 835                 }
 836                 return true;
 837         }
 838
 839         if ((next_change < 0) ||
 840             (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
 841                 return false;
 842         }
 843
 844         if ((localtime_r(&now, &tm_now) == NULL) ||
 845             (localtime_r(&next_change, &tm_next_change) == NULL)) {
 846                 return false;
 847         }
 848
 849         days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
 850                (tm_now.tm_yday+tm_now.tm_year*365);
 851
 852         if (days == 0) {
 853                 _make_remark(ctx, PAM_TEXT_INFO,
 854                              _("Your password expires today"));
 855                 return true;
 856         }
 857
 858         if (days > 0 && days < warn_pwd_expire) {
 859                 _make_remark_format(ctx, PAM_TEXT_INFO,
 860                                     _("Your password will expire in %d %s"),
 861                                     days, (days > 1) ? _("days"):_("day"));
 862                 return true;
 863         }
 864
 865         return false;
 866 }
 867
 868 /**
 869  * Send a warning if the password expires in the near future
 870  *
 871  * @param ctx PAM winbind context.
 872  * @param response The full authentication response structure.
 873  * @param already_expired boolean, is the pwd already expired?
 874  *
 875  * @return void.
 876  */
 877
 878 static void _pam_warn_password_expiry(struct pwb_context *ctx,
 879                                       const struct wbcAuthUserInfo *info,
 880                                       const struct wbcUserPasswordPolicyInfo *policy,
 881                                       int warn_pwd_expire,
 882                                       bool *already_expired)
 883 {
 884         time_t now = time(NULL);
 885         time_t next_change = 0;
 886
 887         if (!info || !policy) {
 888                 return;
 889         }
 890
 891         if (already_expired) {
 892                 *already_expired = false;
 893         }
 894
 895         /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
 896         if (info->acct_flags & WBC_ACB_PWNOEXP) {
 897                 return;
 898         }
 899
 900         /* no point in sending a warning if this is a grace logon */
 901         if (PAM_WB_GRACE_LOGON(info->user_flags)) {
 902                 return;
 903         }
 904
 905         /* check if the info3 must change timestamp has been set */
 906         next_change = info->pass_must_change_time;
 907
 908         if (_pam_send_password_expiry_message(ctx, next_change, now,
 909                                               warn_pwd_expire,
 910                                               already_expired)) {
 911                 return;
 912         }
 913
 914         /* now check for the global password policy */
 915         /* good catch from Ralf Haferkamp: an expiry of "never" is translated
 916          * to -1 */
 917         if ((policy->expire == (int64_t)-1) ||
 918             (policy->expire == 0)) {
 919                 return;
 920         }
 921
 922         next_change = info->pass_last_set_time + policy->expire;
 923
 924         if (_pam_send_password_expiry_message(ctx, next_change, now,
 925                                               warn_pwd_expire,
 926                                               already_expired)) {
 927                 return;
 928         }
 929
 930         /* no warning sent */
 931 }
 932
 933 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
 934
 935 /**
 936  * Append a string, making sure not to overflow and to always return a
 937  * NULL-terminated string.
 938  *
 939  * @param dest Destination string buffer (must already be NULL-terminated).
 940  * @param src Source string buffer.
 941  * @param dest_buffer_size Size of dest buffer in bytes.
 942  *
 943  * @return false if dest buffer is not big enough (no bytes copied), true on
 944  * success.
 945  */
 946
 947 static bool safe_append_string(char *dest,
 948                                const char *src,
 949                                int dest_buffer_size)
 950 {
 951         int dest_length = strlen(dest);
 952         int src_length = strlen(src);
 953
 954         if (dest_length + src_length + 1 > dest_buffer_size) {
 955                 return false;
 956         }
 957
 958         memcpy(dest + dest_length, src, src_length + 1);
 959         return true;
 960 }
 961
 962 /**
 963  * Convert a names into a SID string, appending it to a buffer.
 964  *
 965  * @param ctx PAM winbind context.
 966  * @param user User in PAM request.
 967  * @param name Name to convert.
 968  * @param sid_list_buffer Where to append the string sid.
 969  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
 970  *
 971  * @return false on failure, true on success.
 972  */
 973 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
 974                                        const char *user,
 975                                        const char *name,
 976                                        char *sid_list_buffer,
 977                                        int sid_list_buffer_size)
 978 {
 979         const char* sid_string = NULL;
 980         char *sid_str = NULL;
 981
 982         /* lookup name? */
 983         if (IS_SID_STRING(name)) {
 984                 sid_string = name;
 985         } else {
 986                 wbcErr wbc_status;
 987                 struct wbcDomainSid sid;
 988                 enum wbcSidType type;
 989
 990                 _pam_log_debug(ctx, LOG_DEBUG,
 991                                "no sid given, looking up: %s\n", name);
 992
 993                 wbc_status = wbcLookupName("", name, &sid, &type);
 994                 if (!WBC_ERROR_IS_OK(wbc_status)) {
 995                         _pam_log(ctx, LOG_INFO,
 996                                  "could not lookup name: %s\n", name);
 997                         return false;
 998                 }
 999
1000                 wbc_status = wbcSidToString(&sid, &sid_str);
1001                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1002                         return false;
1003                 }
1004
1005                 sid_string = sid_str;
1006         }
1007
1008         if (!safe_append_string(sid_list_buffer, sid_string,
1009                                 sid_list_buffer_size)) {
1010                 wbcFreeMemory(sid_str);
1011                 return false;
1012         }
1013
1014         wbcFreeMemory(sid_str);
1015         return true;
1016 }
1017
1018 /**
1019  * Convert a list of names into a list of sids.
1020  *
1021  * @param ctx PAM winbind context.
1022  * @param user User in PAM request.
1023  * @param name_list List of names or string sids, separated by commas.
1024  * @param sid_list_buffer Where to put the list of string sids.
1025  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1026  *
1027  * @return false on failure, true on success.
1028  */
1029 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1030                                                  const char *user,
1031                                                  const char *name_list,
1032                                                  char *sid_list_buffer,
1033                                                  int sid_list_buffer_size)
1034 {
1035         bool result = false;
1036         char *current_name = NULL;
1037         const char *search_location;
1038         const char *comma;
1039
1040         if (sid_list_buffer_size > 0) {
1041                 sid_list_buffer[0] = 0;
1042         }
1043
1044         search_location = name_list;
1045         while ((comma = strstr(search_location, ",")) != NULL) {
1046                 current_name = strndup(search_location,
1047                                        comma - search_location);
1048                 if (NULL == current_name) {
1049                         goto out;
1050                 }
1051
1052                 if (!winbind_name_to_sid_string(ctx, user,
1053                                                 current_name,
1054                                                 sid_list_buffer,
1055                                                 sid_list_buffer_size)) {
1056                         goto out;
1057                 }
1058
1059                 SAFE_FREE(current_name);
1060
1061                 if (!safe_append_string(sid_list_buffer, ",",
1062                                         sid_list_buffer_size)) {
1063                         goto out;
1064                 }
1065
1066                 search_location = comma + 1;
1067         }
1068
1069         if (!winbind_name_to_sid_string(ctx, user, search_location,
1070                                         sid_list_buffer,
1071                                         sid_list_buffer_size)) {
1072                 goto out;
1073         }
1074
1075         result = true;
1076
1077 out:
1078         SAFE_FREE(current_name);
1079         return result;
1080 }
1081
1082 /**
1083  * put krb5ccname variable into environment
1084  *
1085  * @param ctx PAM winbind context.
1086  * @param krb5ccname env variable retrieved from winbindd.
1087  *
1088  * @return void.
1089  */
1090
1091 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1092                                 struct wbcLogonUserInfo *info)
1093 {
1094         char var[PATH_MAX];
1095         int ret;
1096         uint32_t i;
1097         const char *krb5ccname = NULL;
1098
1099         if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1100                 return;
1101         }
1102
1103         if (!info) {
1104                 return;
1105         }
1106
1107         for (i=0; i < info->num_blobs; i++) {
1108                 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1109                         krb5ccname = (const char *)info->blobs[i].blob.data;
1110                         break;
1111                 }
1112         }
1113
1114         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1115                 return;
1116         }
1117
1118         _pam_log_debug(ctx, LOG_DEBUG,
1119                        "request returned KRB5CCNAME: %s", krb5ccname);
1120
1121         if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
1122                 return;
1123         }
1124
1125         ret = pam_putenv(ctx->pamh, var);
1126         if (ret) {
1127                 _pam_log(ctx, LOG_ERR,
1128                          "failed to set KRB5CCNAME to %s: %s",
1129                          var, pam_strerror(ctx->pamh, ret));
1130         }
1131 }
1132
1133 /**
1134  * Copy unix username if available (further processed in PAM).
1135  *
1136  * @param ctx PAM winbind context
1137  * @param user_ret A pointer that holds a pointer to a string
1138  * @param unix_username A username
1139  *
1140  * @return void.
1141  */
1142
1143 static void _pam_setup_unix_username(struct pwb_context *ctx,
1144                                      char **user_ret,
1145                                      struct wbcLogonUserInfo *info)
1146 {
1147         const char *unix_username = NULL;
1148         uint32_t i;
1149
1150         if (!user_ret || !info) {
1151                 return;
1152         }
1153
1154         for (i=0; i < info->num_blobs; i++) {
1155                 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1156                         unix_username = (const char *)info->blobs[i].blob.data;
1157                         break;
1158                 }
1159         }
1160
1161         if (!unix_username || !unix_username[0]) {
1162                 return;
1163         }
1164
1165         *user_ret = strdup(unix_username);
1166 }
1167
1168 /**
1169  * Set string into the PAM stack.
1170  *
1171  * @param ctx PAM winbind context.
1172  * @param data_name Key name for pam_set_data.
1173  * @param value String value.
1174  *
1175  * @return void.
1176  */
1177
1178 static void _pam_set_data_string(struct pwb_context *ctx,
1179                                  const char *data_name,
1180                                  const char *value)
1181 {
1182         int ret;
1183
1184         if (!data_name || !value || (strlen(data_name) == 0) ||
1185              (strlen(value) == 0)) {
1186                 return;
1187         }
1188
1189         ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1190                            _pam_winbind_cleanup_func);
1191         if (ret) {
1192                 _pam_log_debug(ctx, LOG_DEBUG,
1193                                "Could not set data %s: %s\n",
1194                                data_name, pam_strerror(ctx->pamh, ret));
1195         }
1196 }
1197
1198 /**
1199  * Set info3 strings into the PAM stack.
1200  *
1201  * @param ctx PAM winbind context.
1202  * @param data_name Key name for pam_set_data.
1203  * @param value String value.
1204  *
1205  * @return void.
1206  */
1207
1208 static void _pam_set_data_info3(struct pwb_context *ctx,
1209                                 const struct wbcAuthUserInfo *info)
1210 {
1211         _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1212                              info->home_directory);
1213         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1214                              info->logon_script);
1215         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1216                              info->logon_server);
1217         _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1218                              info->profile_path);
1219 }
1220
1221 /**
1222  * Free info3 strings in the PAM stack.
1223  *
1224  * @param pamh PAM handle
1225  *
1226  * @return void.
1227  */
1228
1229 static void _pam_free_data_info3(pam_handle_t *pamh)
1230 {
1231         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1232         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1233         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1234         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1235 }
1236
1237 /**
1238  * Send PAM_ERROR_MSG for cached or grace logons.
1239  *
1240  * @param ctx PAM winbind context.
1241  * @param username User in PAM request.
1242  * @param info3_user_flgs Info3 flags containing logon type bits.
1243  *
1244  * @return void.
1245  */
1246
1247 static void _pam_warn_logon_type(struct pwb_context *ctx,
1248                                  const char *username,
1249                                  uint32_t info3_user_flgs)
1250 {
1251         /* inform about logon type */
1252         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1253
1254                 _make_remark(ctx, PAM_ERROR_MSG,
1255                              _("Grace login. "
1256                                "Please change your password as soon you're "
1257                                "online again"));
1258                 _pam_log_debug(ctx, LOG_DEBUG,
1259                                "User %s logged on using grace logon\n",
1260                                username);
1261
1262         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1263
1264                 _make_remark(ctx, PAM_ERROR_MSG,
1265                              _("Domain Controller unreachable, "
1266                                "using cached credentials instead. "
1267                                "Network resources may be unavailable"));
1268                 _pam_log_debug(ctx, LOG_DEBUG,
1269                                "User %s logged on using cached credentials\n",
1270                                username);
1271         }
1272 }
1273
1274 /**
1275  * Send PAM_ERROR_MSG for krb5 errors.
1276  *
1277  * @param ctx PAM winbind context.
1278  * @param username User in PAM request.
1279  * @param info3_user_flgs Info3 flags containing logon type bits.
1280  *
1281  * @return void.
1282  */
1283
1284 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1285                                    const char *username,
1286                                    uint32_t info3_user_flgs)
1287 {
1288         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1289                 _make_remark(ctx, PAM_ERROR_MSG,
1290                              _("Failed to establish your Kerberos Ticket cache "
1291                                "due time differences\n"
1292                                "with the domain controller.  "
1293                                "Please verify the system time.\n"));
1294                 _pam_log_debug(ctx, LOG_DEBUG,
1295                                "User %s: Clock skew when getting Krb5 TGT\n",
1296                                username);
1297         }
1298 }
1299
1300 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1301                                        const struct wbcAuthErrorInfo *e,
1302                                        const char *nt_status_string,
1303                                        int *pam_error)
1304 {
1305         const char *ntstatus = NULL;
1306         const char *error_string = NULL;
1307
1308         if (!e || !pam_error) {
1309                 return false;
1310         }
1311
1312         ntstatus = e->nt_string;
1313         if (!ntstatus) {
1314                 return false;
1315         }
1316
1317         if (strcasecmp(ntstatus, nt_status_string) == 0) {
1318
1319                 error_string = _get_ntstatus_error_string(nt_status_string);
1320                 if (error_string) {
1321                         _make_remark(ctx, PAM_ERROR_MSG, error_string);
1322                         *pam_error = e->pam_error;
1323                         return true;
1324                 }
1325
1326                 if (e->display_string) {
1327                         _make_remark(ctx, PAM_ERROR_MSG, e->display_string);
1328                         *pam_error = e->pam_error;
1329                         return true;
1330                 }
1331
1332                 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1333                 *pam_error = e->pam_error;
1334
1335                 return true;
1336         }
1337
1338         return false;
1339 };
1340
1341 /**
1342  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1343  *
1344  * @param i The wbcUserPasswordPolicyInfo struct.
1345  *
1346  * @return string (caller needs to talloc_free).
1347  */
1348
1349 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1350                                                  struct wbcUserPasswordPolicyInfo *i)
1351 {
1352         char *str = NULL;
1353
1354         if (!i) {
1355                 goto failed;
1356         }
1357
1358         str = talloc_asprintf(ctx, _("Your password "));
1359         if (!str) {
1360                 goto failed;
1361         }
1362
1363         if (i->min_length_password > 0) {
1364                 str = talloc_asprintf_append(str,
1365                                _("must be at least %d characters; "),
1366                                i->min_length_password);
1367                 if (!str) {
1368                         goto failed;
1369                 }
1370         }
1371
1372         if (i->password_history > 0) {
1373                 str = talloc_asprintf_append(str,
1374                                _("cannot repeat any of your previous %d "
1375                                  "passwords; "),
1376                                i->password_history);
1377                 if (!str) {
1378                         goto failed;
1379                 }
1380         }
1381
1382         if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1383                 str = talloc_asprintf_append(str,
1384                                _("must contain capitals, numerals "
1385                                  "or punctuation; "
1386                                  "and cannot contain your account "
1387                                  "or full name; "));
1388                 if (!str) {
1389                         goto failed;
1390                 }
1391         }
1392
1393         str = talloc_asprintf_append(str,
1394                        _("Please type a different password. "
1395                          "Type a password which meets these requirements in "
1396                          "both text boxes."));
1397         if (!str) {
1398                 goto failed;
1399         }
1400
1401         return str;
1402
1403  failed:
1404         TALLOC_FREE(str);
1405         return NULL;
1406 }
1407
1408 static int _pam_create_homedir(struct pwb_context *ctx,
1409                                const char *dirname,
1410                                mode_t mode)
1411 {
1412         struct stat sbuf;
1413
1414         if (stat(dirname, &sbuf) == 0) {
1415                 return PAM_SUCCESS;
1416         }
1417
1418         if (mkdir(dirname, mode) != 0) {
1419
1420                 _make_remark_format(ctx, PAM_TEXT_INFO,
1421                                     _("Creating directory: %s failed: %s"),
1422                                     dirname, strerror(errno));
1423                 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1424                  dirname, strerror(errno));
1425                  return PAM_PERM_DENIED;
1426         }
1427
1428         return PAM_SUCCESS;
1429 }
1430
1431 static int _pam_chown_homedir(struct pwb_context *ctx,
1432                               const char *dirname,
1433                               uid_t uid,
1434                               gid_t gid)
1435 {
1436         if (chown(dirname, uid, gid) != 0) {
1437                 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1438                          dirname, strerror(errno));
1439                 return PAM_PERM_DENIED;
1440         }
1441
1442         return PAM_SUCCESS;
1443 }
1444
1445 static int _pam_mkhomedir(struct pwb_context *ctx)
1446 {
1447         struct passwd *pwd = NULL;
1448         char *token = NULL;
1449         char *create_dir = NULL;
1450         char *user_dir = NULL;
1451         int ret;
1452         const char *username;
1453         mode_t mode = 0700;
1454         char *safe_ptr = NULL;
1455         char *p = NULL;
1456
1457         /* Get the username */
1458         ret = pam_get_user(ctx->pamh, &username, NULL);
1459         if ((ret != PAM_SUCCESS) || (!username)) {
1460                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1461                 return PAM_SERVICE_ERR;
1462         }
1463
1464         pwd = getpwnam(username);
1465         if (pwd == NULL) {
1466                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1467                 return PAM_USER_UNKNOWN;
1468         }
1469         _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1470
1471         ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1472         if (ret == PAM_SUCCESS) {
1473                 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1474                                          pwd->pw_uid,
1475                                          pwd->pw_gid);
1476         }
1477
1478         if (ret == PAM_SUCCESS) {
1479                 return ret;
1480         }
1481
1482         /* maybe we need to create parent dirs */
1483         create_dir = talloc_strdup(ctx, "/");
1484         if (!create_dir) {
1485                 return PAM_BUF_ERR;
1486         }
1487
1488         /* find final directory */
1489         user_dir = strrchr(pwd->pw_dir, '/');
1490         if (!user_dir) {
1491                 return PAM_BUF_ERR;
1492         }
1493         user_dir++;
1494
1495         _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1496
1497         p = pwd->pw_dir;
1498
1499         while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1500
1501                 mode = 0755;
1502
1503                 p = NULL;
1504
1505                 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1506
1507                 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1508                 if (!create_dir) {
1509                         return PAM_BUF_ERR;
1510                 }
1511                 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1512
1513                 if (strcmp(token, user_dir) == 0) {
1514                         _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1515                         mode = 0700;
1516                 }
1517
1518                 ret = _pam_create_homedir(ctx, create_dir, mode);
1519                 if (ret) {
1520                         return ret;
1521                 }
1522         }
1523
1524         return _pam_chown_homedir(ctx, create_dir,
1525                                   pwd->pw_uid,
1526                                   pwd->pw_gid);
1527 }
1528
1529 /* talk to winbindd */
1530 static int winbind_auth_request(struct pwb_context *ctx,
1531                                 const char *user,
1532                                 const char *pass,
1533                                 const char *member,
1534                                 const char *cctype,
1535                                 const int warn_pwd_expire,
1536                                 struct wbcAuthErrorInfo **p_error,
1537                                 struct wbcLogonUserInfo **p_info,
1538                                 struct wbcUserPasswordPolicyInfo **p_policy,
1539                                 time_t *pwd_last_set,
1540                                 char **user_ret)
1541 {
1542         wbcErr wbc_status;
1543
1544         struct wbcLogonUserParams logon;
1545         char membership_of[1024];
1546         uid_t user_uid = -1;
1547         uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1548                          WBFLAG_PAM_GET_PWD_POLICY;
1549
1550         struct wbcLogonUserInfo *info = NULL;
1551         struct wbcAuthUserInfo *user_info = NULL;
1552         struct wbcAuthErrorInfo *error = NULL;
1553         struct wbcUserPasswordPolicyInfo *policy = NULL;
1554
1555         int ret = PAM_AUTH_ERR;
1556         int i;
1557         const char *codes[] = {
1558                 "NT_STATUS_PASSWORD_EXPIRED",
1559                 "NT_STATUS_PASSWORD_MUST_CHANGE",
1560                 "NT_STATUS_INVALID_WORKSTATION",
1561                 "NT_STATUS_INVALID_LOGON_HOURS",
1562                 "NT_STATUS_ACCOUNT_EXPIRED",
1563                 "NT_STATUS_ACCOUNT_DISABLED",
1564                 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1565                 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1566                 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1567                 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1568                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1569                 "NT_STATUS_NO_LOGON_SERVERS",
1570                 "NT_STATUS_WRONG_PASSWORD",
1571                 "NT_STATUS_ACCESS_DENIED"
1572         };
1573
1574         if (pwd_last_set) {
1575                 *pwd_last_set = 0;
1576         }
1577
1578         /* Krb5 auth always has to go against the KDC of the user's realm */
1579
1580         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1581                 flags           |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1582         }
1583
1584         if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1585                 struct passwd *pwd = NULL;
1586
1587                 pwd = getpwnam(user);
1588                 if (pwd == NULL) {
1589                         return PAM_USER_UNKNOWN;
1590                 }
1591                 user_uid        = pwd->pw_uid;
1592         }
1593
1594         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1595
1596                 _pam_log_debug(ctx, LOG_DEBUG,
1597                                "enabling krb5 login flag\n");
1598
1599                 flags           |= WBFLAG_PAM_KRB5 |
1600                                    WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1601         }
1602
1603         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1604                 _pam_log_debug(ctx, LOG_DEBUG,
1605                                "enabling cached login flag\n");
1606                 flags           |= WBFLAG_PAM_CACHED_LOGIN;
1607         }
1608
1609         if (user_ret) {
1610                 *user_ret = NULL;
1611                 flags           |= WBFLAG_PAM_UNIX_NAME;
1612         }
1613
1614         if (cctype != NULL) {
1615                 _pam_log_debug(ctx, LOG_DEBUG,
1616                                "enabling request for a %s krb5 ccache\n",
1617                                cctype);
1618         }
1619
1620         if (member != NULL) {
1621
1622                 ZERO_STRUCT(membership_of);
1623
1624                 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1625                                                           membership_of,
1626                                                           sizeof(membership_of))) {
1627                         _pam_log_debug(ctx, LOG_ERR,
1628                                        "failed to serialize membership of sid "
1629                                        "\"%s\"\n", member);
1630                         return PAM_AUTH_ERR;
1631                 }
1632         }
1633
1634         ZERO_STRUCT(logon);
1635
1636         logon.username                  = user;
1637         logon.password                  = pass;
1638
1639         if (cctype) {
1640                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1641                                              &logon.blobs,
1642                                              "krb5_cc_type",
1643                                              0,
1644                                              (uint8_t *)cctype,
1645                                              strlen(cctype)+1);
1646                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1647                         goto done;
1648                 }
1649         }
1650
1651         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1652                                      &logon.blobs,
1653                                      "flags",
1654                                      0,
1655                                      (uint8_t *)&flags,
1656                                      sizeof(flags));
1657         if (!WBC_ERROR_IS_OK(wbc_status)) {
1658                 goto done;
1659         }
1660
1661         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1662                                      &logon.blobs,
1663                                      "user_uid",
1664                                      0,
1665                                      (uint8_t *)&user_uid,
1666                                      sizeof(user_uid));
1667         if (!WBC_ERROR_IS_OK(wbc_status)) {
1668                 goto done;
1669         }
1670
1671         if (member) {
1672                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1673                                              &logon.blobs,
1674                                              "membership_of",
1675                                              0,
1676                                              (uint8_t *)membership_of,
1677                                              sizeof(membership_of));
1678                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1679                         goto done;
1680                 }
1681         }
1682
1683         wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1684         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1685                                           user, "wbcLogonUser");
1686         wbcFreeMemory(logon.blobs);
1687         logon.blobs = NULL;
1688
1689         if (info && info->info) {
1690                 user_info = info->info;
1691         }
1692
1693         if (pwd_last_set && user_info) {
1694                 *pwd_last_set = user_info->pass_last_set_time;
1695         }
1696
1697         if (p_info && info) {
1698                 *p_info = info;
1699         }
1700
1701         if (p_policy && policy) {
1702                 *p_policy = policy;
1703         }
1704
1705         if (p_error && error) {
1706                 /* We want to process the error in the caller. */
1707                 *p_error = error;
1708                 return ret;
1709         }
1710
1711         for (i=0; i<ARRAY_SIZE(codes); i++) {
1712                 int _ret = ret;
1713                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1714                         ret = _ret;
1715                         goto done;
1716                 }
1717         }
1718
1719         if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1720
1721                 bool already_expired = false;
1722
1723                 /* warn a user if the password is about to expire soon */
1724                 _pam_warn_password_expiry(ctx, user_info, policy,
1725                                           warn_pwd_expire,
1726                                           &already_expired);
1727
1728                 if (already_expired == true) {
1729
1730                         SMB_TIME_T last_set = user_info->pass_last_set_time;
1731
1732                         _pam_log_debug(ctx, LOG_DEBUG,
1733                                        "Password has expired "
1734                                        "(Password was last set: %lld, "
1735                                        "the policy says it should expire here "
1736                                        "%lld (now it's: %lu))\n",
1737                                        (long long int)last_set,
1738                                        (long long int)last_set +
1739                                        policy->expire,
1740                                        time(NULL));
1741
1742                         return PAM_AUTHTOK_EXPIRED;
1743                 }
1744
1745                 /* inform about logon type */
1746                 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1747
1748                 /* inform about krb5 failures */
1749                 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1750
1751                 /* set some info3 info for other modules in the stack */
1752                 _pam_set_data_info3(ctx, user_info);
1753
1754                 /* put krb5ccname into env */
1755                 _pam_setup_krb5_env(ctx, info);
1756
1757                 /* If winbindd returned a username, return the pointer to it
1758                  * here. */
1759                 _pam_setup_unix_username(ctx, user_ret, info);
1760         }
1761
1762  done:
1763         if (logon.blobs) {
1764                 wbcFreeMemory(logon.blobs);
1765         }
1766         if (info && info->blobs) {
1767                 wbcFreeMemory(info->blobs);
1768         }
1769         if (error && !p_error) {
1770                 wbcFreeMemory(error);
1771         }
1772         if (info && !p_info) {
1773                 wbcFreeMemory(info);
1774         }
1775         if (policy && !p_policy) {
1776                 wbcFreeMemory(policy);
1777         }
1778
1779         return ret;
1780 }
1781
1782 /* talk to winbindd */
1783 static int winbind_chauthtok_request(struct pwb_context *ctx,
1784                                      const char *user,
1785                                      const char *oldpass,
1786                                      const char *newpass,
1787                                      time_t pwd_last_set)
1788 {
1789         wbcErr wbc_status;
1790         struct wbcChangePasswordParams params;
1791         struct wbcAuthErrorInfo *error = NULL;
1792         struct wbcUserPasswordPolicyInfo *policy = NULL;
1793         enum wbcPasswordChangeRejectReason reject_reason = -1;
1794         uint32_t flags = 0;
1795
1796         int i;
1797         const char *codes[] = {
1798                 "NT_STATUS_BACKUP_CONTROLLER",
1799                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1800                 "NT_STATUS_NO_LOGON_SERVERS",
1801                 "NT_STATUS_ACCESS_DENIED",
1802                 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1803                 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1804                 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1805         };
1806         int ret = PAM_AUTH_ERR;
1807
1808         ZERO_STRUCT(params);
1809
1810         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1811                 flags |= WBFLAG_PAM_KRB5 |
1812                          WBFLAG_PAM_CONTACT_TRUSTDOM;
1813         }
1814
1815         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1816                 flags |= WBFLAG_PAM_CACHED_LOGIN;
1817         }
1818
1819         params.account_name             = user;
1820         params.level                    = WBC_AUTH_USER_LEVEL_PLAIN;
1821         params.old_password.plaintext   = oldpass;
1822         params.new_password.plaintext   = newpass;
1823         params.flags                    = flags;
1824
1825         wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1826         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1827                                           user, "wbcChangeUserPasswordEx");
1828
1829         if (WBC_ERROR_IS_OK(wbc_status)) {
1830                 _pam_log(ctx, LOG_NOTICE,
1831                          "user '%s' password changed", user);
1832                 return PAM_SUCCESS;
1833         }
1834
1835         if (!error) {
1836                 wbcFreeMemory(policy);
1837                 return ret;
1838         }
1839
1840         for (i=0; i<ARRAY_SIZE(codes); i++) {
1841                 int _ret = ret;
1842                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1843                         ret = _ret;
1844                         goto done;
1845                 }
1846         }
1847
1848         if (!strcasecmp(error->nt_string,
1849                         "NT_STATUS_PASSWORD_RESTRICTION")) {
1850
1851                 char *pwd_restriction_string = NULL;
1852                 SMB_TIME_T min_pwd_age = 0;
1853
1854                 if (policy) {
1855                         min_pwd_age     = policy->min_passwordage;
1856                 }
1857
1858                 /* FIXME: avoid to send multiple PAM messages after another */
1859                 switch (reject_reason) {
1860                         case -1:
1861                                 break;
1862                         case WBC_PWD_CHANGE_REJECT_OTHER:
1863                                 if ((min_pwd_age > 0) &&
1864                                     (pwd_last_set + min_pwd_age > time(NULL))) {
1865                                         PAM_WB_REMARK_DIRECT(ctx,
1866                                              "NT_STATUS_PWD_TOO_RECENT");
1867                                 }
1868                                 break;
1869                         case WBC_PWD_CHANGE_REJECT_TOO_SHORT:
1870                                 PAM_WB_REMARK_DIRECT(ctx,
1871                                         "NT_STATUS_PWD_TOO_SHORT");
1872                                 break;
1873                         case WBC_PWD_CHANGE_REJECT_IN_HISTORY:
1874                                 PAM_WB_REMARK_DIRECT(ctx,
1875                                         "NT_STATUS_PWD_HISTORY_CONFLICT");
1876                                 break;
1877                         case WBC_PWD_CHANGE_REJECT_COMPLEXITY:
1878                                 _make_remark(ctx, PAM_ERROR_MSG,
1879                                              _("Password does not meet "
1880                                                "complexity requirements"));
1881                                 break;
1882                         default:
1883                                 _pam_log_debug(ctx, LOG_DEBUG,
1884                                                "unknown password change "
1885                                                "reject reason: %d",
1886                                                reject_reason);
1887                                 break;
1888                 }
1889
1890                 pwd_restriction_string =
1891                         _pam_compose_pwd_restriction_string(ctx, policy);
1892                 if (pwd_restriction_string) {
1893                         _make_remark(ctx, PAM_ERROR_MSG,
1894                                      pwd_restriction_string);
1895                         TALLOC_FREE(pwd_restriction_string);
1896                 }
1897         }
1898  done:
1899         wbcFreeMemory(error);
1900         wbcFreeMemory(policy);
1901
1902         return ret;
1903 }
1904
1905 /*
1906  * Checks if a user has an account
1907  *
1908  * return values:
1909  *       1  = User not found
1910  *       0  = OK
1911  *      -1  = System error
1912  */
1913 static int valid_user(struct pwb_context *ctx,
1914                       const char *user)
1915 {
1916         /* check not only if the user is available over NSS calls, also make
1917          * sure it's really a winbind user, this is important when stacking PAM
1918          * modules in the 'account' or 'password' facility. */
1919
1920         wbcErr wbc_status;
1921         struct passwd *pwd = NULL;
1922         struct passwd *wb_pwd = NULL;
1923
1924         pwd = getpwnam(user);
1925         if (pwd == NULL) {
1926                 return 1;
1927         }
1928
1929         wbc_status = wbcGetpwnam(user, &wb_pwd);
1930         wbcFreeMemory(wb_pwd);
1931         if (!WBC_ERROR_IS_OK(wbc_status)) {
1932                 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
1933                         wbcErrorString(wbc_status));
1934         }
1935
1936         switch (wbc_status) {
1937                 case WBC_ERR_UNKNOWN_USER:
1938                         return 1;
1939                 case WBC_ERR_SUCCESS:
1940                         return 0;
1941                 default:
1942                         break;
1943         }
1944         return -1;
1945 }
1946
1947 static char *_pam_delete(register char *xx)
1948 {
1949         _pam_overwrite(xx);
1950         _pam_drop(xx);
1951         return NULL;
1952 }
1953
1954 /*
1955  * obtain a password from the user
1956  */
1957
1958 static int _winbind_read_password(struct pwb_context *ctx,
1959                                   unsigned int ctrl,
1960                                   const char *comment,
1961                                   const char *prompt1,
1962                                   const char *prompt2,
1963                                   const char **pass)
1964 {
1965         int authtok_flag;
1966         int retval;
1967         const char *item;
1968         char *token;
1969
1970         _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
1971
1972         /*
1973          * make sure nothing inappropriate gets returned
1974          */
1975
1976         *pass = token = NULL;
1977
1978         /*
1979          * which authentication token are we getting?
1980          */
1981
1982         if (on(WINBIND__OLD_PASSWORD, ctrl)) {
1983                 authtok_flag = PAM_OLDAUTHTOK;
1984         } else {
1985                 authtok_flag = PAM_AUTHTOK;
1986         }
1987
1988         /*
1989          * should we obtain the password from a PAM item ?
1990          */
1991
1992         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
1993             on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1994                 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
1995                 if (retval != PAM_SUCCESS) {
1996                         /* very strange. */
1997                         _pam_log(ctx, LOG_ALERT,
1998                                  "pam_get_item returned error "
1999                                  "to unix-read-password");
2000                         return retval;
2001                 } else if (item != NULL) {      /* we have a password! */
2002                         *pass = item;
2003                         item = NULL;
2004                         _pam_log(ctx, LOG_DEBUG,
2005                                  "pam_get_item returned a password");
2006                         return PAM_SUCCESS;
2007                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2008                         return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2009                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2010                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
2011                         return PAM_AUTHTOK_RECOVER_ERR;
2012                 }
2013         }
2014         /*
2015          * getting here implies we will have to get the password from the
2016          * user directly.
2017          */
2018
2019         {
2020                 struct pam_message msg[3], *pmsg[3];
2021                 struct pam_response *resp;
2022                 int i, replies;
2023
2024                 /* prepare to converse */
2025
2026                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2027                         pmsg[0] = &msg[0];
2028                         msg[0].msg_style = PAM_TEXT_INFO;
2029                         msg[0].msg = discard_const_p(char, comment);
2030                         i = 1;
2031                 } else {
2032                         i = 0;
2033                 }
2034
2035                 pmsg[i] = &msg[i];
2036                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2037                 msg[i++].msg = discard_const_p(char, prompt1);
2038                 replies = 1;
2039
2040                 if (prompt2 != NULL) {
2041                         pmsg[i] = &msg[i];
2042                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2043                         msg[i++].msg = discard_const_p(char, prompt2);
2044                         ++replies;
2045                 }
2046                 /* so call the conversation expecting i responses */
2047                 resp = NULL;
2048                 retval = converse(ctx->pamh, i, pmsg, &resp);
2049                 if (resp == NULL) {
2050                         if (retval == PAM_SUCCESS) {
2051                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2052                         }
2053                         goto done;
2054                 }
2055                 if (retval != PAM_SUCCESS) {
2056                         _pam_drop_reply(resp, i);
2057                         goto done;
2058                 }
2059
2060                 /* interpret the response */
2061
2062                 token = x_strdup(resp[i - replies].resp);
2063                 if (!token) {
2064                         _pam_log(ctx, LOG_NOTICE,
2065                                  "could not recover "
2066                                  "authentication token");
2067                         retval = PAM_AUTHTOK_RECOVER_ERR;
2068                         goto done;
2069                 }
2070
2071                 if (replies == 2) {
2072                         /* verify that password entered correctly */
2073                         if (!resp[i - 1].resp ||
2074                             strcmp(token, resp[i - 1].resp)) {
2075                                 _pam_delete(token);     /* mistyped */
2076                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2077                                 _make_remark(ctx, PAM_ERROR_MSG,
2078                                              MISTYPED_PASS);
2079                         }
2080                 }
2081
2082                 /*
2083                  * tidy up the conversation (resp_retcode) is ignored
2084                  * -- what is it for anyway? AGM
2085                  */
2086                 _pam_drop_reply(resp, i);
2087         }
2088
2089  done:
2090         if (retval != PAM_SUCCESS) {
2091                 _pam_log_debug(ctx, LOG_DEBUG,
2092                                "unable to obtain a password");
2093                 return retval;
2094         }
2095         /* 'token' is the entered password */
2096
2097         /* we store this password as an item */
2098
2099         retval = pam_set_item(ctx->pamh, authtok_flag, token);
2100         _pam_delete(token);     /* clean it up */
2101         if (retval != PAM_SUCCESS ||
2102             (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
2103
2104                 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2105                 return retval;
2106
2107         }
2108
2109         *pass = item;
2110         item = NULL;            /* break link to password */
2111
2112         return PAM_SUCCESS;
2113 }
2114
2115 static const char *get_conf_item_string(struct pwb_context *ctx,
2116                                         const char *item,
2117                                         int config_flag)
2118 {
2119         int i = 0;
2120         const char *parm_opt = NULL;
2121
2122         if (!(ctx->ctrl & config_flag)) {
2123                 goto out;
2124         }
2125
2126         /* let the pam opt take precedence over the pam_winbind.conf option */
2127         for (i=0; i<ctx->argc; i++) {
2128
2129                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2130                         char *p;
2131
2132                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2133                                 _pam_log(ctx, LOG_INFO,
2134                                          "no \"=\" delimiter for \"%s\" found\n",
2135                                          item);
2136                                 goto out;
2137                         }
2138                         _pam_log_debug(ctx, LOG_INFO,
2139                                        "PAM config: %s '%s'\n", item, p+1);
2140                         return p + 1;
2141                 }
2142         }
2143
2144         if (ctx->dict) {
2145                 char *key = NULL;
2146
2147                 key = talloc_asprintf(ctx, "global:%s", item);
2148                 if (!key) {
2149                         goto out;
2150                 }
2151
2152                 parm_opt = iniparser_getstr(ctx->dict, key);
2153                 TALLOC_FREE(key);
2154
2155                 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2156                                item, parm_opt);
2157         }
2158 out:
2159         return parm_opt;
2160 }
2161
2162 static int get_config_item_int(struct pwb_context *ctx,
2163                                const char *item,
2164                                int config_flag)
2165 {
2166         int i, parm_opt = -1;
2167
2168         if (!(ctx->ctrl & config_flag)) {
2169                 goto out;
2170         }
2171
2172         /* let the pam opt take precedence over the pam_winbind.conf option */
2173         for (i = 0; i < ctx->argc; i++) {
2174
2175                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2176                         char *p;
2177
2178                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2179                                 _pam_log(ctx, LOG_INFO,
2180                                          "no \"=\" delimiter for \"%s\" found\n",
2181                                          item);
2182                                 goto out;
2183                         }
2184                         parm_opt = atoi(p + 1);
2185                         _pam_log_debug(ctx, LOG_INFO,
2186                                        "PAM config: %s '%d'\n",
2187                                        item, parm_opt);
2188                         return parm_opt;
2189                 }
2190         }
2191
2192         if (ctx->dict) {
2193                 char *key = NULL;
2194
2195                 key = talloc_asprintf(ctx, "global:%s", item);
2196                 if (!key) {
2197                         goto out;
2198                 }
2199
2200                 parm_opt = iniparser_getint(ctx->dict, key, -1);
2201                 TALLOC_FREE(key);
2202
2203                 _pam_log_debug(ctx, LOG_INFO,
2204                                "CONFIG file: %s '%d'\n",
2205                                item, parm_opt);
2206         }
2207 out:
2208         return parm_opt;
2209 }
2210
2211 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2212 {
2213         return get_conf_item_string(ctx, "krb5_ccache_type",
2214                                     WINBIND_KRB5_CCACHE_TYPE);
2215 }
2216
2217 static const char *get_member_from_config(struct pwb_context *ctx)
2218 {
2219         const char *ret = NULL;
2220         ret = get_conf_item_string(ctx, "require_membership_of",
2221                                    WINBIND_REQUIRED_MEMBERSHIP);
2222         if (ret) {
2223                 return ret;
2224         }
2225         return get_conf_item_string(ctx, "require-membership-of",
2226                                     WINBIND_REQUIRED_MEMBERSHIP);
2227 }
2228
2229 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2230 {
2231         int ret;
2232         ret = get_config_item_int(ctx, "warn_pwd_expire",
2233                                   WINBIND_WARN_PWD_EXPIRE);
2234         /* no or broken setting */
2235         if (ret <= 0) {
2236                 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2237         }
2238         return ret;
2239 }
2240
2241 /**
2242  * Retrieve the winbind separator.
2243  *
2244  * @param ctx PAM winbind context.
2245  *
2246  * @return string separator character. NULL on failure.
2247  */
2248
2249 static char winbind_get_separator(struct pwb_context *ctx)
2250 {
2251         wbcErr wbc_status;
2252         static struct wbcInterfaceDetails *details = NULL;
2253
2254         wbc_status = wbcInterfaceDetails(&details);
2255         if (!WBC_ERROR_IS_OK(wbc_status)) {
2256                 _pam_log(ctx, LOG_ERR,
2257                          "Could not retrieve winbind interface details: %s",
2258                          wbcErrorString(wbc_status));
2259                 return '\0';
2260         }
2261
2262         if (!details) {
2263                 return '\0';
2264         }
2265
2266         return details->winbind_separator;
2267 }
2268
2269
2270 /**
2271  * Convert a upn to a name.
2272  *
2273  * @param ctx PAM winbind context.
2274  * @param upn  USer UPN to be trabslated.
2275  *
2276  * @return converted name. NULL pointer on failure. Caller needs to free.
2277  */
2278
2279 static char* winbind_upn_to_username(struct pwb_context *ctx,
2280                                      const char *upn)
2281 {
2282         char sep;
2283         wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2284         struct wbcDomainSid sid;
2285         enum wbcSidType type;
2286         char *domain;
2287         char *name;
2288         char *p;
2289
2290         /* This cannot work when the winbind separator = @ */
2291
2292         sep = winbind_get_separator(ctx);
2293         if (!sep || sep == '@') {
2294                 return NULL;
2295         }
2296
2297         name = talloc_strdup(ctx, upn);
2298         if (!name) {
2299                 return NULL;
2300         }
2301
2302         if ((p = strchr(name, '@')) != NULL) {
2303                 *p = 0;
2304                 domain = p + 1;
2305         }
2306
2307         /* Convert the UPN to a SID */
2308
2309         wbc_status = wbcLookupName(domain, name, &sid, &type);
2310         if (!WBC_ERROR_IS_OK(wbc_status)) {
2311                 return NULL;
2312         }
2313
2314         /* Convert the the SID back to the sAMAccountName */
2315
2316         wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2317         if (!WBC_ERROR_IS_OK(wbc_status)) {
2318                 return NULL;
2319         }
2320
2321         return talloc_asprintf(ctx, "%s\\%s", domain, name);
2322 }
2323
2324 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2325                          int argc, const char **argv)
2326 {
2327         int retval = PAM_SUCCESS;
2328         struct pwb_context *ctx = NULL;
2329         struct wbcLogoffUserParams logoff;
2330         struct wbcAuthErrorInfo *error = NULL;
2331         const char *user;
2332         wbcErr wbc_status = WBC_ERR_SUCCESS;
2333
2334         ZERO_STRUCT(logoff);
2335
2336         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2337         if (retval) {
2338                 goto out;
2339         }
2340
2341         _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2342
2343         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2344
2345                 /* destroy the ccache here */
2346
2347                 uint32_t wbc_flags = 0;
2348                 const char *ccname = NULL;
2349                 struct passwd *pwd = NULL;
2350
2351                 retval = pam_get_user(pamh, &user, _("Username: "));
2352                 if (retval) {
2353                         _pam_log(ctx, LOG_ERR,
2354                                  "could not identify user");
2355                         goto out;
2356                 }
2357
2358                 if (user == NULL) {
2359                         _pam_log(ctx, LOG_ERR,
2360                                  "username was NULL!");
2361                         retval = PAM_USER_UNKNOWN;
2362                         goto out;
2363                 }
2364
2365                 _pam_log_debug(ctx, LOG_DEBUG,
2366                                "username [%s] obtained", user);
2367
2368                 ccname = pam_getenv(pamh, "KRB5CCNAME");
2369                 if (ccname == NULL) {
2370                         _pam_log_debug(ctx, LOG_DEBUG,
2371                                        "user has no KRB5CCNAME environment");
2372                 }
2373
2374                 pwd = getpwnam(user);
2375                 if (pwd == NULL) {
2376                         retval = PAM_USER_UNKNOWN;
2377                         goto out;
2378                 }
2379
2380                 wbc_flags = WBFLAG_PAM_KRB5 |
2381                         WBFLAG_PAM_CONTACT_TRUSTDOM;
2382
2383                 logoff.username         = user;
2384
2385                 if (ccname) {
2386                         wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2387                                                      &logoff.blobs,
2388                                                      "ccfilename",
2389                                                      0,
2390                                                      (uint8_t *)ccname,
2391                                                      strlen(ccname)+1);
2392                         if (!WBC_ERROR_IS_OK(wbc_status)) {
2393                                 goto out;
2394                         }
2395                 }
2396
2397                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2398                                              &logoff.blobs,
2399                                              "flags",
2400                                              0,
2401                                              (uint8_t *)&wbc_flags,
2402                                              sizeof(wbc_flags));
2403                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2404                         goto out;
2405                 }
2406
2407                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2408                                              &logoff.blobs,
2409                                              "user_uid",
2410                                              0,
2411                                              (uint8_t *)&pwd->pw_uid,
2412                                              sizeof(pwd->pw_uid));
2413                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2414                         goto out;
2415                 }
2416
2417                 wbc_status = wbcLogoffUserEx(&logoff, &error);
2418                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2419                                                      user, "wbcLogoffUser");
2420                 wbcFreeMemory(error);
2421                 wbcFreeMemory(logoff.blobs);
2422                 logoff.blobs = NULL;
2423
2424                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2425                         _pam_log(ctx, LOG_INFO,
2426                                  "failed to logoff user %s: %s\n",
2427                                          user, wbcErrorString(wbc_status));
2428                 }
2429         }
2430
2431 out:
2432         if (logoff.blobs) {
2433                 wbcFreeMemory(logoff.blobs);
2434         }
2435
2436         if (!WBC_ERROR_IS_OK(wbc_status)) {
2437                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2438                      user, "wbcLogoffUser");
2439         }
2440
2441         /*
2442          * Delete the krb5 ccname variable from the PAM environment
2443          * if it was set by winbind.
2444          */
2445         if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2446                 pam_putenv(pamh, "KRB5CCNAME");
2447         }
2448
2449         _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2450
2451         TALLOC_FREE(ctx);
2452
2453         return retval;
2454 }
2455
2456 PAM_EXTERN
2457 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2458                         int argc, const char **argv)
2459 {
2460         const char *username;
2461         const char *password;
2462         const char *member = NULL;
2463         const char *cctype = NULL;
2464         int warn_pwd_expire;
2465         int retval = PAM_AUTH_ERR;
2466         char *username_ret = NULL;
2467         char *new_authtok_required = NULL;
2468         char *real_username = NULL;
2469         struct pwb_context *ctx = NULL;
2470
2471         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2472         if (retval) {
2473                 goto out;
2474         }
2475
2476         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2477
2478         /* Get the username */
2479         retval = pam_get_user(pamh, &username, NULL);
2480         if ((retval != PAM_SUCCESS) || (!username)) {
2481                 _pam_log_debug(ctx, LOG_DEBUG,
2482                                "can not get the username");
2483                 retval = PAM_SERVICE_ERR;
2484                 goto out;
2485         }
2486
2487
2488 #if defined(AIX)
2489         /* Decode the user name since AIX does not support logn user
2490            names by default.  The name is encoded as _#uid.  */
2491
2492         if (username[0] == '_') {
2493                 uid_t id = atoi(&username[1]);
2494                 struct passwd *pw = NULL;
2495
2496                 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2497                         real_username = strdup(pw->pw_name);
2498                 }
2499         }
2500 #endif
2501
2502         if (!real_username) {
2503                 /* Just making a copy of the username we got from PAM */
2504                 if ((real_username = strdup(username)) == NULL) {
2505                         _pam_log_debug(ctx, LOG_DEBUG,
2506                                        "memory allocation failure when copying "
2507                                        "username");
2508                         retval = PAM_SERVICE_ERR;
2509                         goto out;
2510                 }
2511         }
2512
2513         /* Maybe this was a UPN */
2514
2515         if (strchr(real_username, '@') != NULL) {
2516                 char *samaccountname = NULL;
2517
2518                 samaccountname = winbind_upn_to_username(ctx,
2519                                                          real_username);
2520                 if (samaccountname) {
2521                         free(real_username);
2522                         real_username = strdup(samaccountname);
2523                 }
2524         }
2525
2526         retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2527                                         _("Password: "), NULL,
2528                                         &password);
2529
2530         if (retval != PAM_SUCCESS) {
2531                 _pam_log(ctx, LOG_ERR,
2532                          "Could not retrieve user's password");
2533                 retval = PAM_AUTHTOK_ERR;
2534                 goto out;
2535         }
2536
2537         /* Let's not give too much away in the log file */
2538
2539 #ifdef DEBUG_PASSWORD
2540         _pam_log_debug(ctx, LOG_INFO,
2541                        "Verify user '%s' with password '%s'",
2542                        real_username, password);
2543 #else
2544         _pam_log_debug(ctx, LOG_INFO,
2545                        "Verify user '%s'", real_username);
2546 #endif
2547
2548         member = get_member_from_config(ctx);
2549         cctype = get_krb5_cc_type_from_config(ctx);
2550         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2551
2552         /* Now use the username to look up password */
2553         retval = winbind_auth_request(ctx, real_username, password,
2554                                       member, cctype, warn_pwd_expire,
2555                                       NULL, NULL, NULL,
2556                                       NULL, &username_ret);
2557
2558         if (retval == PAM_NEW_AUTHTOK_REQD ||
2559             retval == PAM_AUTHTOK_EXPIRED) {
2560
2561                 char *new_authtok_required_during_auth = NULL;
2562
2563                 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2564                 if (!new_authtok_required) {
2565                         retval = PAM_BUF_ERR;
2566                         goto out;
2567                 }
2568
2569                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2570                              new_authtok_required,
2571                              _pam_winbind_cleanup_func);
2572
2573                 retval = PAM_SUCCESS;
2574
2575                 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2576                 if (!new_authtok_required_during_auth) {
2577                         retval = PAM_BUF_ERR;
2578                         goto out;
2579                 }
2580
2581                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2582                              new_authtok_required_during_auth,
2583                              _pam_winbind_cleanup_func);
2584
2585                 goto out;
2586         }
2587
2588 out:
2589         if (username_ret) {
2590                 pam_set_item (pamh, PAM_USER, username_ret);
2591                 _pam_log_debug(ctx, LOG_INFO,
2592                                "Returned user was '%s'", username_ret);
2593                 free(username_ret);
2594         }
2595
2596         if (real_username) {
2597                 free(real_username);
2598         }
2599
2600         if (!new_authtok_required) {
2601                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2602         }
2603
2604         if (retval != PAM_SUCCESS) {
2605                 _pam_free_data_info3(pamh);
2606         }
2607
2608         _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2609
2610         TALLOC_FREE(ctx);
2611
2612         return retval;
2613 }
2614
2615 PAM_EXTERN
2616 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2617                    int argc, const char **argv)
2618 {
2619         int ret = PAM_SYSTEM_ERR;
2620         struct pwb_context *ctx = NULL;
2621
2622         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2623         if (ret) {
2624                 goto out;
2625         }
2626
2627         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2628
2629         switch (flags & ~PAM_SILENT) {
2630
2631                 case PAM_DELETE_CRED:
2632                         ret = _pam_delete_cred(pamh, flags, argc, argv);
2633                         break;
2634                 case PAM_REFRESH_CRED:
2635                         _pam_log_debug(ctx, LOG_WARNING,
2636                                        "PAM_REFRESH_CRED not implemented");
2637                         ret = PAM_SUCCESS;
2638                         break;
2639                 case PAM_REINITIALIZE_CRED:
2640                         _pam_log_debug(ctx, LOG_WARNING,
2641                                        "PAM_REINITIALIZE_CRED not implemented");
2642                         ret = PAM_SUCCESS;
2643                         break;
2644                 case PAM_ESTABLISH_CRED:
2645                         _pam_log_debug(ctx, LOG_WARNING,
2646                                        "PAM_ESTABLISH_CRED not implemented");
2647                         ret = PAM_SUCCESS;
2648                         break;
2649                 default:
2650                         ret = PAM_SYSTEM_ERR;
2651                         break;
2652         }
2653
2654  out:
2655
2656         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2657
2658         TALLOC_FREE(ctx);
2659
2660         return ret;
2661 }
2662
2663 /*
2664  * Account management. We want to verify that the account exists
2665  * before returning PAM_SUCCESS
2666  */
2667 PAM_EXTERN
2668 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2669                    int argc, const char **argv)
2670 {
2671         const char *username;
2672         int ret = PAM_USER_UNKNOWN;
2673         void *tmp = NULL;
2674         struct pwb_context *ctx = NULL;
2675
2676         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2677         if (ret) {
2678                 goto out;
2679         }
2680
2681         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2682
2683
2684         /* Get the username */
2685         ret = pam_get_user(pamh, &username, NULL);
2686         if ((ret != PAM_SUCCESS) || (!username)) {
2687                 _pam_log_debug(ctx, LOG_DEBUG,
2688                                "can not get the username");
2689                 ret = PAM_SERVICE_ERR;
2690                 goto out;
2691         }
2692
2693         /* Verify the username */
2694         ret = valid_user(ctx, username);
2695         switch (ret) {
2696         case -1:
2697                 /* some sort of system error. The log was already printed */
2698                 ret = PAM_SERVICE_ERR;
2699                 goto out;
2700         case 1:
2701                 /* the user does not exist */
2702                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2703                                username);
2704                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2705                         ret = PAM_IGNORE;
2706                         goto out;
2707                 }
2708                 ret = PAM_USER_UNKNOWN;
2709                 goto out;
2710         case 0:
2711                 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2712                              (const void **)&tmp);
2713                 if (tmp != NULL) {
2714                         ret = atoi((const char *)tmp);
2715                         switch (ret) {
2716                         case PAM_AUTHTOK_EXPIRED:
2717                                 /* fall through, since new token is required in this case */
2718                         case PAM_NEW_AUTHTOK_REQD:
2719                                 _pam_log(ctx, LOG_WARNING,
2720                                          "pam_sm_acct_mgmt success but %s is set",
2721                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
2722                                 _pam_log(ctx, LOG_NOTICE,
2723                                          "user '%s' needs new password",
2724                                          username);
2725                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2726                                 ret = PAM_NEW_AUTHTOK_REQD;
2727                                 goto out;
2728                         default:
2729                                 _pam_log(ctx, LOG_WARNING,
2730                                          "pam_sm_acct_mgmt success");
2731                                 _pam_log(ctx, LOG_NOTICE,
2732                                          "user '%s' granted access", username);
2733                                 ret = PAM_SUCCESS;
2734                                 goto out;
2735                         }
2736                 }
2737
2738                 /* Otherwise, the authentication looked good */
2739                 _pam_log(ctx, LOG_NOTICE,
2740                          "user '%s' granted access", username);
2741                 ret = PAM_SUCCESS;
2742                 goto out;
2743         default:
2744                 /* we don't know anything about this return value */
2745                 _pam_log(ctx, LOG_ERR,
2746                          "internal module error (ret = %d, user = '%s')",
2747                          ret, username);
2748                 ret = PAM_SERVICE_ERR;
2749                 goto out;
2750         }
2751
2752         /* should not be reached */
2753         ret = PAM_IGNORE;
2754
2755  out:
2756
2757         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2758
2759         TALLOC_FREE(ctx);
2760
2761         return ret;
2762 }
2763
2764 PAM_EXTERN
2765 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2766                         int argc, const char **argv)
2767 {
2768         int ret = PAM_SUCCESS;
2769         struct pwb_context *ctx = NULL;
2770
2771         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2772         if (ret) {
2773                 goto out;
2774         }
2775
2776         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2777
2778         if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2779                 /* check and create homedir */
2780                 ret = _pam_mkhomedir(ctx);
2781         }
2782  out:
2783         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2784
2785         TALLOC_FREE(ctx);
2786
2787         return ret;
2788 }
2789
2790 PAM_EXTERN
2791 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2792                          int argc, const char **argv)
2793 {
2794         int ret = PAM_SUCCESS;
2795         struct pwb_context *ctx = NULL;
2796
2797         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2798         if (ret) {
2799                 goto out;
2800         }
2801
2802         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2803
2804 out:
2805         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2806
2807         TALLOC_FREE(ctx);
2808
2809         return ret;
2810 }
2811
2812 /**
2813  * evaluate whether we need to re-authenticate with kerberos after a
2814  * password change
2815  *
2816  * @param ctx PAM winbind context.
2817  * @param user The username
2818  *
2819  * @return boolean Returns true if required, false if not.
2820  */
2821
2822 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2823                                                    const char *user)
2824 {
2825
2826         /* Make sure that we only do this if a) the chauthtok got initiated
2827          * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2828          * later password change via the "passwd" command if done by the user
2829          * itself
2830          * NB. If we login from gdm or xdm and the password expires,
2831          * we change the password, but there is no memory cache.
2832          * Thus, even for passthrough login, we should do the
2833          * authentication again to update memory cache.
2834          * --- BoYang
2835          * */
2836
2837         char *new_authtok_reqd_during_auth = NULL;
2838         struct passwd *pwd = NULL;
2839
2840         _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2841                       &new_authtok_reqd_during_auth);
2842         pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2843                      NULL, NULL);
2844
2845         if (new_authtok_reqd_during_auth) {
2846                 return true;
2847         }
2848
2849         pwd = getpwnam(user);
2850         if (!pwd) {
2851                 return false;
2852         }
2853
2854         if (getuid() == pwd->pw_uid) {
2855                 return true;
2856         }
2857
2858         return false;
2859 }
2860
2861
2862 PAM_EXTERN
2863 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2864                      int argc, const char **argv)
2865 {
2866         unsigned int lctrl;
2867         int ret;
2868         bool cached_login = false;
2869
2870         /* <DO NOT free() THESE> */
2871         const char *user;
2872         char *pass_old, *pass_new;
2873         /* </DO NOT free() THESE> */
2874
2875         char *Announce;
2876
2877         int retry = 0;
2878         char *username_ret = NULL;
2879         struct wbcAuthErrorInfo *error = NULL;
2880         struct pwb_context *ctx = NULL;
2881
2882         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2883         if (ret) {
2884                 goto out;
2885         }
2886
2887         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
2888
2889         cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
2890
2891         /* clearing offline bit for auth */
2892         ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
2893
2894         /*
2895          * First get the name of a user
2896          */
2897         ret = pam_get_user(pamh, &user, _("Username: "));
2898         if (ret) {
2899                 _pam_log(ctx, LOG_ERR,
2900                          "password - could not identify user");
2901                 goto out;
2902         }
2903
2904         if (user == NULL) {
2905                 _pam_log(ctx, LOG_ERR, "username was NULL!");
2906                 ret = PAM_USER_UNKNOWN;
2907                 goto out;
2908         }
2909
2910         _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
2911
2912         /* check if this is really a user in winbindd, not only in NSS */
2913         ret = valid_user(ctx, user);
2914         switch (ret) {
2915                 case 1:
2916                         ret = PAM_USER_UNKNOWN;
2917                         goto out;
2918                 case -1:
2919                         ret = PAM_SYSTEM_ERR;
2920                         goto out;
2921                 default:
2922                         break;
2923         }
2924
2925         /*
2926          * obtain and verify the current password (OLDAUTHTOK) for
2927          * the user.
2928          */
2929
2930         if (flags & PAM_PRELIM_CHECK) {
2931                 time_t pwdlastset_prelim = 0;
2932
2933                 /* instruct user what is happening */
2934
2935 #define greeting _("Changing password for ")
2936                 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
2937                 if (!Announce) {
2938                         _pam_log(ctx, LOG_CRIT,
2939                                  "password - out of memory");
2940                         ret = PAM_BUF_ERR;
2941                         goto out;
2942                 }
2943 #undef greeting
2944
2945                 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
2946                 ret = _winbind_read_password(ctx, lctrl,
2947                                                 Announce,
2948                                                 _("(current) NT password: "),
2949                                                 NULL,
2950                                                 (const char **) &pass_old);
2951                 TALLOC_FREE(Announce);
2952                 if (ret != PAM_SUCCESS) {
2953                         _pam_log(ctx, LOG_NOTICE,
2954                                  "password - (old) token not obtained");
2955                         goto out;
2956                 }
2957
2958                 /* verify that this is the password for this user */
2959
2960                 ret = winbind_auth_request(ctx, user, pass_old,
2961                                            NULL, NULL, 0,
2962                                            &error, NULL, NULL,
2963                                            &pwdlastset_prelim, NULL);
2964
2965                 if (ret != PAM_ACCT_EXPIRED &&
2966                     ret != PAM_AUTHTOK_EXPIRED &&
2967                     ret != PAM_NEW_AUTHTOK_REQD &&
2968                     ret != PAM_SUCCESS) {
2969                         pass_old = NULL;
2970                         goto out;
2971                 }
2972
2973                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
2974                              (void *)pwdlastset_prelim, NULL);
2975
2976                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
2977                                    (const void *) pass_old);
2978                 pass_old = NULL;
2979                 if (ret != PAM_SUCCESS) {
2980                         _pam_log(ctx, LOG_CRIT,
2981                                  "failed to set PAM_OLDAUTHTOK");
2982                 }
2983         } else if (flags & PAM_UPDATE_AUTHTOK) {
2984
2985                 time_t pwdlastset_update = 0;
2986
2987                 /*
2988                  * obtain the proposed password
2989                  */
2990
2991                 /*
2992                  * get the old token back.
2993                  */
2994
2995                 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
2996
2997                 if (ret != PAM_SUCCESS) {
2998                         _pam_log(ctx, LOG_NOTICE,
2999                                  "user not authenticated");
3000                         goto out;
3001                 }
3002
3003                 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3004
3005                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3006                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3007                 }
3008                 retry = 0;
3009                 ret = PAM_AUTHTOK_ERR;
3010                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3011                         /*
3012                          * use_authtok is to force the use of a previously entered
3013                          * password -- needed for pluggable password strength checking
3014                          */
3015
3016                         ret = _winbind_read_password(ctx, lctrl,
3017                                                      NULL,
3018                                                      _("Enter new NT password: "),
3019                                                      _("Retype new NT password: "),
3020                                                      (const char **)&pass_new);
3021
3022                         if (ret != PAM_SUCCESS) {
3023                                 _pam_log_debug(ctx, LOG_ALERT,
3024                                                "password - "
3025                                                "new password not obtained");
3026                                 pass_old = NULL;/* tidy up */
3027                                 goto out;
3028                         }
3029
3030                         /*
3031                          * At this point we know who the user is and what they
3032                          * propose as their new password. Verify that the new
3033                          * password is acceptable.
3034                          */
3035
3036                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
3037                                 pass_new = NULL;
3038                         }
3039                 }
3040
3041                 /*
3042                  * By reaching here we have approved the passwords and must now
3043                  * rebuild the password database file.
3044                  */
3045                 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3046                               &pwdlastset_update);
3047
3048                 /*
3049                  * if cached creds were enabled, make sure to set the
3050                  * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3051                  * update the cached creds storage - gd
3052                  */
3053                 if (cached_login) {
3054                         ctx->ctrl |= WINBIND_CACHED_LOGIN;
3055                 }
3056
3057                 ret = winbind_chauthtok_request(ctx, user, pass_old,
3058                                                 pass_new, pwdlastset_update);
3059                 if (ret) {
3060                         pass_old = pass_new = NULL;
3061                         goto out;
3062                 }
3063
3064                 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3065
3066                         const char *member = NULL;
3067                         const char *cctype = NULL;
3068                         int warn_pwd_expire;
3069                         struct wbcLogonUserInfo *info = NULL;
3070                         struct wbcUserPasswordPolicyInfo *policy = NULL;
3071
3072                         member = get_member_from_config(ctx);
3073                         cctype = get_krb5_cc_type_from_config(ctx);
3074                         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3075
3076                         /* Keep WINBIND_CACHED_LOGIN bit for
3077                          * authentication after changing the password.
3078                          * This will update the cached credentials in case
3079                          * that winbindd_dual_pam_chauthtok() fails
3080                          * to update them.
3081                          * --- BoYang
3082                          * */
3083
3084                         ret = winbind_auth_request(ctx, user, pass_new,
3085                                                    member, cctype, 0,
3086                                                    &error, &info, &policy,
3087                                                    NULL, &username_ret);
3088                         pass_old = pass_new = NULL;
3089
3090                         if (ret == PAM_SUCCESS) {
3091
3092                                 struct wbcAuthUserInfo *user_info = NULL;
3093
3094                                 if (info && info->info) {
3095                                         user_info = info->info;
3096                                 }
3097
3098                                 /* warn a user if the password is about to
3099                                  * expire soon */
3100                                 _pam_warn_password_expiry(ctx, user_info, policy,
3101                                                           warn_pwd_expire,
3102                                                           NULL);
3103
3104                                 /* set some info3 info for other modules in the
3105                                  * stack */
3106                                 _pam_set_data_info3(ctx, user_info);
3107
3108                                 /* put krb5ccname into env */
3109                                 _pam_setup_krb5_env(ctx, info);
3110
3111                                 if (username_ret) {
3112                                         pam_set_item(pamh, PAM_USER,
3113                                                      username_ret);
3114                                         _pam_log_debug(ctx, LOG_INFO,
3115                                                        "Returned user was '%s'",
3116                                                        username_ret);
3117                                         free(username_ret);
3118                                 }
3119
3120                                 wbcFreeMemory(info);
3121                                 wbcFreeMemory(policy);
3122                         }
3123
3124                         goto out;
3125                 }
3126         } else {
3127                 ret = PAM_SERVICE_ERR;
3128         }
3129
3130 out:
3131         {
3132                 /* Deal with offline errors. */
3133                 int i;
3134                 const char *codes[] = {
3135                         "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3136                         "NT_STATUS_NO_LOGON_SERVERS",
3137                         "NT_STATUS_ACCESS_DENIED"
3138                 };
3139
3140                 for (i=0; i<ARRAY_SIZE(codes); i++) {
3141                         int _ret;
3142                         if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3143                                 break;
3144                         }
3145                 }
3146         }
3147
3148         wbcFreeMemory(error);
3149
3150         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3151
3152         TALLOC_FREE(ctx);
3153
3154         return ret;
3155 }
3156
3157 #ifdef PAM_STATIC
3158
3159 /* static module data */
3160
3161 struct pam_module _pam_winbind_modstruct = {
3162         MODULE_NAME,
3163         pam_sm_authenticate,
3164         pam_sm_setcred,
3165         pam_sm_acct_mgmt,
3166         pam_sm_open_session,
3167         pam_sm_close_session,
3168         pam_sm_chauthtok
3169 };
3170
3171 #endif
3172
3173 /*
3174  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
3175  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
3176  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3177  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2008
3178  * Copyright (c) Jan Rêkorajski 1999.
3179  * Copyright (c) Andrew G. Morgan 1996-8.
3180  * Copyright (c) Alex O. Yuriev, 1996.
3181  * Copyright (c) Cristian Gafton 1996.
3182  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3183  *
3184  * Redistribution and use in source and binary forms, with or without
3185  * modification, are permitted provided that the following conditions
3186  * are met:
3187  * 1. Redistributions of source code must retain the above copyright
3188  *    notice, and the entire permission notice in its entirety,
3189  *    including the disclaimer of warranties.
3190  * 2. Redistributions in binary form must reproduce the above copyright
3191  *    notice, this list of conditions and the following disclaimer in the
3192  *    documentation and/or other materials provided with the distribution.
3193  * 3. The name of the author may not be used to endorse or promote
3194  *    products derived from this software without specific prior
3195  *    written permission.
3196  *
3197  * ALTERNATIVELY, this product may be distributed under the terms of
3198  * the GNU Public License, in which case the provisions of the GPL are
3199  * required INSTEAD OF the above restrictions.  (This clause is
3200  * necessary due to a potential bad interaction between the GPL and
3201  * the restrictions contained in a BSD-style copyright.)
3202  *
3203  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3204  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3205  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3206  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3207  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3208  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3209  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3210  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3211  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3212  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3213  * OF THE POSSIBILITY OF SUCH DAMAGE.
3214  */