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, 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(discard_const_p(char, config_file));
 414         if (d == NULL) {
 415                 goto config_from_pam;
 416         }
 417
 418         if (iniparser_getboolean(d, discard_const_p(char, "global:debug"), false)) {
 419                 ctrl |= WINBIND_DEBUG_ARG;
 420         }
 421
 422         if (iniparser_getboolean(d, discard_const_p(char, "global:debug_state"), false)) {
 423                 ctrl |= WINBIND_DEBUG_STATE;
 424         }
 425
 426         if (iniparser_getboolean(d, discard_const_p(char, "global:cached_login"), false)) {
 427                 ctrl |= WINBIND_CACHED_LOGIN;
 428         }
 429
 430         if (iniparser_getboolean(d, discard_const_p(char, "global:krb5_auth"), false)) {
 431                 ctrl |= WINBIND_KRB5_AUTH;
 432         }
 433
 434         if (iniparser_getboolean(d, discard_const_p(char, "global:silent"), false)) {
 435                 ctrl |= WINBIND_SILENT;
 436         }
 437
 438         if (iniparser_getstr(d, discard_const_p(char, "global:krb5_ccache_type")) != NULL) {
 439                 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 440         }
 441
 442         if ((iniparser_getstr(d, discard_const_p(char, "global:require-membership-of"))
 443              != NULL) ||
 444             (iniparser_getstr(d, discard_const_p(char, "global:require_membership_of"))
 445              != NULL)) {
 446                 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 447         }
 448
 449         if (iniparser_getboolean(d, discard_const_p(char, "global:try_first_pass"), false)) {
 450                 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 451         }
 452
 453         if (iniparser_getint(d, discard_const_p(char, "global:warn_pwd_expire"), 0)) {
 454                 ctrl |= WINBIND_WARN_PWD_EXPIRE;
 455         }
 456
 457         if (iniparser_getboolean(d, discard_const_p(char, "global:mkhomedir"), false)) {
 458                 ctrl |= WINBIND_MKHOMEDIR;
 459         }
 460
 461 config_from_pam:
 462         /* step through arguments */
 463         for (i=argc,v=argv; i-- > 0; ++v) {
 464
 465                 /* generic options */
 466                 if (!strcmp(*v,"debug"))
 467                         ctrl |= WINBIND_DEBUG_ARG;
 468                 else if (!strcasecmp(*v, "debug_state"))
 469                         ctrl |= WINBIND_DEBUG_STATE;
 470                 else if (!strcasecmp(*v, "silent"))
 471                         ctrl |= WINBIND_SILENT;
 472                 else if (!strcasecmp(*v, "use_authtok"))
 473                         ctrl |= WINBIND_USE_AUTHTOK_ARG;
 474                 else if (!strcasecmp(*v, "use_first_pass"))
 475                         ctrl |= WINBIND_USE_FIRST_PASS_ARG;
 476                 else if (!strcasecmp(*v, "try_first_pass"))
 477                         ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 478                 else if (!strcasecmp(*v, "unknown_ok"))
 479                         ctrl |= WINBIND_UNKNOWN_OK_ARG;
 480                 else if (!strncasecmp(*v, "require_membership_of",
 481                                       strlen("require_membership_of")))
 482                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 483                 else if (!strncasecmp(*v, "require-membership-of",
 484                                       strlen("require-membership-of")))
 485                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 486                 else if (!strcasecmp(*v, "krb5_auth"))
 487                         ctrl |= WINBIND_KRB5_AUTH;
 488                 else if (!strncasecmp(*v, "krb5_ccache_type",
 489                                       strlen("krb5_ccache_type")))
 490                         ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 491                 else if (!strcasecmp(*v, "cached_login"))
 492                         ctrl |= WINBIND_CACHED_LOGIN;
 493                 else if (!strcasecmp(*v, "mkhomedir"))
 494                         ctrl |= WINBIND_MKHOMEDIR;
 495                 else {
 496                         __pam_log(pamh, ctrl, LOG_ERR,
 497                                  "pam_parse: unknown option: %s", *v);
 498                         return -1;
 499                 }
 500
 501         }
 502
 503         if (result_d) {
 504                 *result_d = d;
 505         } else {
 506                 if (d) {
 507                         iniparser_freedict(d);
 508                 }
 509         }
 510
 511         return ctrl;
 512 };
 513
 514 static int _pam_winbind_free_context(struct pwb_context *ctx)
 515 {
 516         if (!ctx) {
 517                 return 0;
 518         }
 519
 520         if (ctx->dict) {
 521                 iniparser_freedict(ctx->dict);
 522         }
 523
 524         return 0;
 525 }
 526
 527 static int _pam_winbind_init_context(pam_handle_t *pamh,
 528                                      int flags,
 529                                      int argc,
 530                                      const char **argv,
 531                                      struct pwb_context **ctx_p)
 532 {
 533         struct pwb_context *r = NULL;
 534
 535 #ifdef HAVE_GETTEXT
 536         textdomain_init();
 537 #endif
 538
 539         r = talloc_zero(NULL, struct pwb_context);
 540         if (!r) {
 541                 return PAM_BUF_ERR;
 542         }
 543
 544         talloc_set_destructor(r, _pam_winbind_free_context);
 545
 546         r->pamh = pamh;
 547         r->flags = flags;
 548         r->argc = argc;
 549         r->argv = argv;
 550         r->ctrl = _pam_parse(pamh, flags, argc, argv, &r->dict);
 551         if (r->ctrl == -1) {
 552                 TALLOC_FREE(r);
 553                 return PAM_SYSTEM_ERR;
 554         }
 555
 556         *ctx_p = r;
 557
 558         return PAM_SUCCESS;
 559 }
 560
 561 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
 562                                       void *data,
 563                                       int error_status)
 564 {
 565         int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
 566         if (_pam_log_is_debug_state_enabled(ctrl)) {
 567                 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
 568                                "[pamh: %p] CLEAN: cleaning up PAM data %p "
 569                                "(error_status = %d)", pamh, data,
 570                                error_status);
 571         }
 572         TALLOC_FREE(data);
 573 }
 574
 575
 576 static const struct ntstatus_errors {
 577         const char *ntstatus_string;
 578         const char *error_string;
 579 } ntstatus_errors[] = {
 580         {"NT_STATUS_OK",
 581                 N_("Success")},
 582         {"NT_STATUS_BACKUP_CONTROLLER",
 583                 N_("No primary Domain Controler available")},
 584         {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
 585                 N_("No domain controllers found")},
 586         {"NT_STATUS_NO_LOGON_SERVERS",
 587                 N_("No logon servers")},
 588         {"NT_STATUS_PWD_TOO_SHORT",
 589                 N_("Password too short")},
 590         {"NT_STATUS_PWD_TOO_RECENT",
 591                 N_("The password of this user is too recent to change")},
 592         {"NT_STATUS_PWD_HISTORY_CONFLICT",
 593                 N_("Password is already in password history")},
 594         {"NT_STATUS_PASSWORD_EXPIRED",
 595                 N_("Your password has expired")},
 596         {"NT_STATUS_PASSWORD_MUST_CHANGE",
 597                 N_("You need to change your password now")},
 598         {"NT_STATUS_INVALID_WORKSTATION",
 599                 N_("You are not allowed to logon from this workstation")},
 600         {"NT_STATUS_INVALID_LOGON_HOURS",
 601                 N_("You are not allowed to logon at this time")},
 602         {"NT_STATUS_ACCOUNT_EXPIRED",
 603                 N_("Your account has expired. "
 604                    "Please contact your System administrator")}, /* SCNR */
 605         {"NT_STATUS_ACCOUNT_DISABLED",
 606                 N_("Your account is disabled. "
 607                    "Please contact your System administrator")}, /* SCNR */
 608         {"NT_STATUS_ACCOUNT_LOCKED_OUT",
 609                 N_("Your account has been locked. "
 610                    "Please contact your System administrator")}, /* SCNR */
 611         {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
 612                 N_("Invalid Trust Account")},
 613         {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
 614                 N_("Invalid Trust Account")},
 615         {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
 616                 N_("Invalid Trust Account")},
 617         {"NT_STATUS_ACCESS_DENIED",
 618                 N_("Access is denied")},
 619         {NULL, NULL}
 620 };
 621
 622 static const char *_get_ntstatus_error_string(const char *nt_status_string)
 623 {
 624         int i;
 625         for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
 626                 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
 627                                 nt_status_string)) {
 628                         return _(ntstatus_errors[i].error_string);
 629                 }
 630         }
 631         return NULL;
 632 }
 633
 634 /* --- authentication management functions --- */
 635
 636 /* Attempt a conversation */
 637
 638 static int converse(const pam_handle_t *pamh,
 639                     int nargs,
 640                     struct pam_message **message,
 641                     struct pam_response **response)
 642 {
 643         int retval;
 644         struct pam_conv *conv;
 645
 646         retval = _pam_get_item(pamh, PAM_CONV, &conv);
 647         if (retval == PAM_SUCCESS) {
 648                 retval = conv->conv(nargs,
 649                                     (const struct pam_message **)message,
 650                                     response, conv->appdata_ptr);
 651         }
 652
 653         return retval; /* propagate error status */
 654 }
 655
 656
 657 static int _make_remark(struct pwb_context *ctx,
 658                         int type,
 659                         const char *text)
 660 {
 661         int retval = PAM_SUCCESS;
 662
 663         struct pam_message *pmsg[1], msg[1];
 664         struct pam_response *resp;
 665
 666         if (ctx->flags & WINBIND_SILENT) {
 667                 return PAM_SUCCESS;
 668         }
 669
 670         pmsg[0] = &msg[0];
 671         msg[0].msg = discard_const_p(char, text);
 672         msg[0].msg_style = type;
 673
 674         resp = NULL;
 675         retval = converse(ctx->pamh, 1, pmsg, &resp);
 676
 677         if (resp) {
 678                 _pam_drop_reply(resp, 1);
 679         }
 680         return retval;
 681 }
 682
 683 static int _make_remark_v(struct pwb_context *ctx,
 684                           int type,
 685                           const char *format,
 686                           va_list args)
 687 {
 688         char *var;
 689         int ret;
 690
 691         ret = vasprintf(&var, format, args);
 692         if (ret < 0) {
 693                 _pam_log(ctx, LOG_ERR, "memory allocation failure");
 694                 return ret;
 695         }
 696
 697         ret = _make_remark(ctx, type, var);
 698         SAFE_FREE(var);
 699         return ret;
 700 }
 701
 702 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 703 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
 704 {
 705         int ret;
 706         va_list args;
 707
 708         va_start(args, format);
 709         ret = _make_remark_v(ctx, type, format, args);
 710         va_end(args);
 711         return ret;
 712 }
 713
 714 static int pam_winbind_request_log(struct pwb_context *ctx,
 715                                    int retval,
 716                                    const char *user,
 717                                    const char *fn)
 718 {
 719         switch (retval) {
 720         case PAM_AUTH_ERR:
 721                 /* incorrect password */
 722                 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
 723                          "(incorrect password or invalid membership)", user);
 724                 return retval;
 725         case PAM_ACCT_EXPIRED:
 726                 /* account expired */
 727                 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
 728                          user);
 729                 return retval;
 730         case PAM_AUTHTOK_EXPIRED:
 731                 /* password expired */
 732                 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
 733                          user);
 734                 return retval;
 735         case PAM_NEW_AUTHTOK_REQD:
 736                 /* new password required */
 737                 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
 738                          "required", user);
 739                 return retval;
 740         case PAM_USER_UNKNOWN:
 741                 /* the user does not exist */
 742                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
 743                                user);
 744                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
 745                         return PAM_IGNORE;
 746                 }
 747                 return retval;
 748         case PAM_SUCCESS:
 749                 /* Otherwise, the authentication looked good */
 750                 if (strcmp(fn, "wbcLogonUser") == 0) {
 751                         _pam_log(ctx, LOG_NOTICE,
 752                                  "user '%s' granted access", user);
 753                 } else {
 754                         _pam_log(ctx, LOG_NOTICE,
 755                                  "user '%s' OK", user);
 756                 }
 757                 return retval;
 758         default:
 759                 /* we don't know anything about this return value */
 760                 _pam_log(ctx, LOG_ERR,
 761                          "internal module error (retval = %s(%d), user = '%s')",
 762                         _pam_error_code_str(retval), retval, user);
 763                 return retval;
 764         }
 765 }
 766
 767 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
 768                                        struct wbcAuthErrorInfo *e,
 769                                        wbcErr status,
 770                                        const char *username,
 771                                        const char *fn)
 772 {
 773         int ret = PAM_AUTH_ERR;
 774
 775         if (WBC_ERROR_IS_OK(status)) {
 776                 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
 777                         fn);
 778                 ret = PAM_SUCCESS;
 779                 return pam_winbind_request_log(ctx, ret, username, fn);
 780         }
 781
 782         if (e) {
 783                 if (e->pam_error != PAM_SUCCESS) {
 784                         _pam_log(ctx, LOG_ERR,
 785                                  "request %s failed: %s, "
 786                                  "PAM error: %s (%d), NTSTATUS: %s, "
 787                                  "Error message was: %s",
 788                                  fn,
 789                                  wbcErrorString(status),
 790                                  _pam_error_code_str(e->pam_error),
 791                                  e->pam_error,
 792                                  e->nt_string,
 793                                  e->display_string);
 794                         ret = e->pam_error;
 795                         return pam_winbind_request_log(ctx, ret, username, fn);
 796                 }
 797
 798                 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
 799
 800                 ret = PAM_SERVICE_ERR;
 801                 return pam_winbind_request_log(ctx, ret, username, fn);
 802         }
 803
 804         ret = wbc_error_to_pam_error(status);
 805         return pam_winbind_request_log(ctx, ret, username, fn);
 806 }
 807
 808 #if defined(HAVE_PAM_RADIO_TYPE)
 809 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 810 {
 811         struct pam_message msg, *pmsg;
 812         struct pam_response *resp = NULL;
 813         const char *prompt;
 814         int ret;
 815         bool retval = false;
 816         prompt = _("Do you want to change your password now?");
 817         pmsg = &msg;
 818         msg.msg_style = PAM_RADIO_TYPE;
 819         msg.msg = prompt;
 820         ret = converse(ctx->pamh, 1, &pmsg, &resp);
 821         if (resp == NULL) {
 822                 if (ret == PAM_SUCCESS) {
 823                         _pam_log(ctx, LOG_CRIT, "pam_winbind: system error!\n");
 824                         return false;
 825                 }
 826         }
 827         if (ret != PAM_SUCCESS) {
 828                 return false;
 829         }
 830         _pam_log(ctx, LOG_CRIT, "Received [%s] reply from application.\n", resp->resp);
 831
 832         if (strcasecmp(resp->resp, "yes") == 0) {
 833                 retval = true;
 834         }
 835
 836         _pam_drop_reply(resp, 1);
 837         return retval;
 838 }
 839 #else
 840 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
 841 {
 842         return false;
 843 }
 844 #endif
 845
 846 /**
 847  * send a password expiry message if required
 848  *
 849  * @param ctx PAM winbind context.
 850  * @param next_change expected (calculated) next expiry date.
 851  * @param already_expired pointer to a boolean to indicate if the password is
 852  *        already expired.
 853  *
 854  * @return boolean Returns true if message has been sent, false if not.
 855  */
 856
 857 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
 858                                               time_t next_change,
 859                                               time_t now,
 860                                               int warn_pwd_expire,
 861                                               bool *already_expired,
 862                                               bool *change_pwd)
 863 {
 864         int days = 0;
 865         struct tm tm_now, tm_next_change;
 866         bool retval = false;
 867         int ret;
 868
 869         if (already_expired) {
 870                 *already_expired = false;
 871         }
 872
 873         if (change_pwd) {
 874                 *change_pwd = false;
 875         }
 876
 877         if (next_change <= now) {
 878                 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
 879                 if (already_expired) {
 880                         *already_expired = true;
 881                 }
 882                 return true;
 883         }
 884
 885         if ((next_change < 0) ||
 886             (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
 887                 return false;
 888         }
 889
 890         if ((localtime_r(&now, &tm_now) == NULL) ||
 891             (localtime_r(&next_change, &tm_next_change) == NULL)) {
 892                 return false;
 893         }
 894
 895         days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
 896                (tm_now.tm_yday+tm_now.tm_year*365);
 897
 898         if (days == 0) {
 899                 ret = _make_remark(ctx, PAM_TEXT_INFO,
 900                                 _("Your password expires today.\n"));
 901
 902                 /*
 903                  * If change_pwd and already_expired is null.
 904                  * We are just sending a notification message.
 905                  * We don't expect any response in this case.
 906                  */
 907
 908                 if (!change_pwd && !already_expired) {
 909                         return true;
 910                 }
 911
 912                 /*
 913                  * successfully sent the warning message.
 914                  * Give the user a chance to change pwd.
 915                  */
 916                 if (ret == PAM_SUCCESS) {
 917                         if (change_pwd) {
 918                                 retval = _pam_winbind_change_pwd(ctx);
 919                                 if (retval) {
 920                                         *change_pwd = true;
 921                                 }
 922                         }
 923                 }
 924                 return true;
 925         }
 926
 927         if (days > 0 && days < warn_pwd_expire) {
 928
 929                 ret = _make_remark_format(ctx, PAM_TEXT_INFO,
 930                                         _("Your password will expire in %d %s.\n"),
 931                                         days, (days > 1) ? _("days"):_("day"));
 932                 /*
 933                  * If change_pwd and already_expired is null.
 934                  * We are just sending a notification message.
 935                  * We don't expect any response in this case.
 936                  */
 937
 938                 if (!change_pwd && !already_expired) {
 939                         return true;
 940                 }
 941
 942                 /*
 943                  * successfully sent the warning message.
 944                  * Give the user a chance to change pwd.
 945                  */
 946                 if (ret == PAM_SUCCESS) {
 947                         if (change_pwd) {
 948                                 retval = _pam_winbind_change_pwd(ctx);
 949                                 if (retval) {
 950                                         *change_pwd = true;
 951                                 }
 952                         }
 953                 }
 954                 return true;
 955         }
 956
 957         return false;
 958 }
 959
 960 /**
 961  * Send a warning if the password expires in the near future
 962  *
 963  * @param ctx PAM winbind context.
 964  * @param response The full authentication response structure.
 965  * @param already_expired boolean, is the pwd already expired?
 966  *
 967  * @return void.
 968  */
 969
 970 static void _pam_warn_password_expiry(struct pwb_context *ctx,
 971                                       const struct wbcAuthUserInfo *info,
 972                                       const struct wbcUserPasswordPolicyInfo *policy,
 973                                       int warn_pwd_expire,
 974                                       bool *already_expired,
 975                                       bool *change_pwd)
 976 {
 977         time_t now = time(NULL);
 978         time_t next_change = 0;
 979
 980         if (!info || !policy) {
 981                 return;
 982         }
 983
 984         if (already_expired) {
 985                 *already_expired = false;
 986         }
 987
 988         if (change_pwd) {
 989                 *change_pwd = false;
 990         }
 991
 992         /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
 993         if (info->acct_flags & WBC_ACB_PWNOEXP) {
 994                 return;
 995         }
 996
 997         /* no point in sending a warning if this is a grace logon */
 998         if (PAM_WB_GRACE_LOGON(info->user_flags)) {
 999                 return;
1000         }
1001
1002         /* check if the info3 must change timestamp has been set */
1003         next_change = info->pass_must_change_time;
1004
1005         if (_pam_send_password_expiry_message(ctx, next_change, now,
1006                                               warn_pwd_expire,
1007                                               already_expired,
1008                                               change_pwd)) {
1009                 return;
1010         }
1011
1012         /* now check for the global password policy */
1013         /* good catch from Ralf Haferkamp: an expiry of "never" is translated
1014          * to -1 */
1015         if ((policy->expire == (int64_t)-1) ||
1016             (policy->expire == 0)) {
1017                 return;
1018         }
1019
1020         next_change = info->pass_last_set_time + policy->expire;
1021
1022         if (_pam_send_password_expiry_message(ctx, next_change, now,
1023                                               warn_pwd_expire,
1024                                               already_expired,
1025                                               change_pwd)) {
1026                 return;
1027         }
1028
1029         /* no warning sent */
1030 }
1031
1032 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
1033
1034 /**
1035  * Append a string, making sure not to overflow and to always return a
1036  * NULL-terminated string.
1037  *
1038  * @param dest Destination string buffer (must already be NULL-terminated).
1039  * @param src Source string buffer.
1040  * @param dest_buffer_size Size of dest buffer in bytes.
1041  *
1042  * @return false if dest buffer is not big enough (no bytes copied), true on
1043  * success.
1044  */
1045
1046 static bool safe_append_string(char *dest,
1047                                const char *src,
1048                                int dest_buffer_size)
1049 {
1050         int dest_length = strlen(dest);
1051         int src_length = strlen(src);
1052
1053         if (dest_length + src_length + 1 > dest_buffer_size) {
1054                 return false;
1055         }
1056
1057         memcpy(dest + dest_length, src, src_length + 1);
1058         return true;
1059 }
1060
1061 /**
1062  * Convert a names into a SID string, appending it to a buffer.
1063  *
1064  * @param ctx PAM winbind context.
1065  * @param user User in PAM request.
1066  * @param name Name to convert.
1067  * @param sid_list_buffer Where to append the string sid.
1068  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1069  *
1070  * @return false on failure, true on success.
1071  */
1072 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
1073                                        const char *user,
1074                                        const char *name,
1075                                        char *sid_list_buffer,
1076                                        int sid_list_buffer_size)
1077 {
1078         char sid_string[WBC_SID_STRING_BUFLEN];
1079
1080         /* lookup name? */
1081         if (IS_SID_STRING(name)) {
1082                 strlcpy(sid_string, name, sizeof(sid_string));
1083         } else {
1084                 wbcErr wbc_status;
1085                 struct wbcDomainSid sid;
1086                 enum wbcSidType type;
1087
1088                 _pam_log_debug(ctx, LOG_DEBUG,
1089                                "no sid given, looking up: %s\n", name);
1090
1091                 wbc_status = wbcLookupName("", name, &sid, &type);
1092                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1093                         _pam_log(ctx, LOG_INFO,
1094                                  "could not lookup name: %s\n", name);
1095                         return false;
1096                 }
1097
1098                 wbcSidToStringBuf(&sid, sid_string, sizeof(sid_string));
1099         }
1100
1101         if (!safe_append_string(sid_list_buffer, sid_string,
1102                                 sid_list_buffer_size)) {
1103                 return false;
1104         }
1105         return true;
1106 }
1107
1108 /**
1109  * Convert a list of names into a list of sids.
1110  *
1111  * @param ctx PAM winbind context.
1112  * @param user User in PAM request.
1113  * @param name_list List of names or string sids, separated by commas.
1114  * @param sid_list_buffer Where to put the list of string sids.
1115  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1116  *
1117  * @return false on failure, true on success.
1118  */
1119 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1120                                                  const char *user,
1121                                                  const char *name_list,
1122                                                  char *sid_list_buffer,
1123                                                  int sid_list_buffer_size)
1124 {
1125         bool result = false;
1126         char *current_name = NULL;
1127         const char *search_location;
1128         const char *comma;
1129         int len;
1130
1131         if (sid_list_buffer_size > 0) {
1132                 sid_list_buffer[0] = 0;
1133         }
1134
1135         search_location = name_list;
1136         while ((comma = strchr(search_location, ',')) != NULL) {
1137                 current_name = strndup(search_location,
1138                                        comma - search_location);
1139                 if (NULL == current_name) {
1140                         goto out;
1141                 }
1142
1143                 if (!winbind_name_to_sid_string(ctx, user,
1144                                                 current_name,
1145                                                 sid_list_buffer,
1146                                                 sid_list_buffer_size)) {
1147                         /*
1148                          * If one group name failed, we must not fail
1149                          * the authentication totally, continue with
1150                          * the following group names. If user belongs to
1151                          * one of the valid groups, we must allow it
1152                          * login. -- BoYang
1153                          */
1154
1155                         _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1156                                  "check if group %s is valid group.", current_name,
1157                                  current_name);
1158                         _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1159                                         "to sid, please contact your administrator to see "
1160                                         "if group %s is valid."), current_name, current_name);
1161                         SAFE_FREE(current_name);
1162                         search_location = comma + 1;
1163                         continue;
1164                 }
1165
1166                 SAFE_FREE(current_name);
1167
1168                 if (!safe_append_string(sid_list_buffer, ",",
1169                                         sid_list_buffer_size)) {
1170                         goto out;
1171                 }
1172
1173                 search_location = comma + 1;
1174         }
1175
1176         if (!winbind_name_to_sid_string(ctx, user, search_location,
1177                                         sid_list_buffer,
1178                                         sid_list_buffer_size)) {
1179                 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1180                          "check if group %s is valid group.", search_location,
1181                          search_location);
1182                 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1183                                 "to sid, please contact your administrator to see "
1184                                 "if group %s is valid."), search_location, search_location);
1185                 /*
1186                  * The lookup of the last name failed..
1187                  * It results in require_member_of_sid ends with ','
1188                  * It is malformated parameter here, overwrite the last ','.
1189                  */
1190                 len = strlen(sid_list_buffer);
1191                 if ((len != 0) && (sid_list_buffer[len - 1] == ',')) {
1192                         sid_list_buffer[len - 1] = '\0';
1193                 }
1194         }
1195
1196         result = true;
1197
1198 out:
1199         SAFE_FREE(current_name);
1200         return result;
1201 }
1202
1203 /**
1204  * put krb5ccname variable into environment
1205  *
1206  * @param ctx PAM winbind context.
1207  * @param krb5ccname env variable retrieved from winbindd.
1208  *
1209  * @return void.
1210  */
1211
1212 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1213                                 struct wbcLogonUserInfo *info)
1214 {
1215         char *var = NULL;
1216         int ret;
1217         uint32_t i;
1218         const char *krb5ccname = NULL;
1219
1220         if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1221                 return;
1222         }
1223
1224         if (!info) {
1225                 return;
1226         }
1227
1228         for (i=0; i < info->num_blobs; i++) {
1229                 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1230                         krb5ccname = (const char *)info->blobs[i].blob.data;
1231                         break;
1232                 }
1233         }
1234
1235         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1236                 return;
1237         }
1238
1239         _pam_log_debug(ctx, LOG_DEBUG,
1240                        "request returned KRB5CCNAME: %s", krb5ccname);
1241
1242         if (asprintf(&var, "KRB5CCNAME=%s", krb5ccname) == -1) {
1243                 return;
1244         }
1245
1246         ret = pam_putenv(ctx->pamh, var);
1247         if (ret) {
1248                 _pam_log(ctx, LOG_ERR,
1249                          "failed to set KRB5CCNAME to %s: %s",
1250                          var, pam_strerror(ctx->pamh, ret));
1251         }
1252         free(var);
1253 }
1254
1255 /**
1256  * Copy unix username if available (further processed in PAM).
1257  *
1258  * @param ctx PAM winbind context
1259  * @param user_ret A pointer that holds a pointer to a string
1260  * @param unix_username A username
1261  *
1262  * @return void.
1263  */
1264
1265 static void _pam_setup_unix_username(struct pwb_context *ctx,
1266                                      char **user_ret,
1267                                      struct wbcLogonUserInfo *info)
1268 {
1269         const char *unix_username = NULL;
1270         uint32_t i;
1271
1272         if (!user_ret || !info) {
1273                 return;
1274         }
1275
1276         for (i=0; i < info->num_blobs; i++) {
1277                 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1278                         unix_username = (const char *)info->blobs[i].blob.data;
1279                         break;
1280                 }
1281         }
1282
1283         if (!unix_username || !unix_username[0]) {
1284                 return;
1285         }
1286
1287         *user_ret = strdup(unix_username);
1288 }
1289
1290 /**
1291  * Set string into the PAM stack.
1292  *
1293  * @param ctx PAM winbind context.
1294  * @param data_name Key name for pam_set_data.
1295  * @param value String value.
1296  *
1297  * @return void.
1298  */
1299
1300 static void _pam_set_data_string(struct pwb_context *ctx,
1301                                  const char *data_name,
1302                                  const char *value)
1303 {
1304         int ret;
1305
1306         if (!data_name || !value || (strlen(data_name) == 0) ||
1307              (strlen(value) == 0)) {
1308                 return;
1309         }
1310
1311         ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1312                            _pam_winbind_cleanup_func);
1313         if (ret) {
1314                 _pam_log_debug(ctx, LOG_DEBUG,
1315                                "Could not set data %s: %s\n",
1316                                data_name, pam_strerror(ctx->pamh, ret));
1317         }
1318 }
1319
1320 /**
1321  * Set info3 strings into the PAM stack.
1322  *
1323  * @param ctx PAM winbind context.
1324  * @param data_name Key name for pam_set_data.
1325  * @param value String value.
1326  *
1327  * @return void.
1328  */
1329
1330 static void _pam_set_data_info3(struct pwb_context *ctx,
1331                                 const struct wbcAuthUserInfo *info)
1332 {
1333         _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1334                              info->home_directory);
1335         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1336                              info->logon_script);
1337         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1338                              info->logon_server);
1339         _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1340                              info->profile_path);
1341 }
1342
1343 /**
1344  * Free info3 strings in the PAM stack.
1345  *
1346  * @param pamh PAM handle
1347  *
1348  * @return void.
1349  */
1350
1351 static void _pam_free_data_info3(pam_handle_t *pamh)
1352 {
1353         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1354         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1355         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1356         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1357 }
1358
1359 /**
1360  * Send PAM_ERROR_MSG for cached or grace logons.
1361  *
1362  * @param ctx PAM winbind context.
1363  * @param username User in PAM request.
1364  * @param info3_user_flgs Info3 flags containing logon type bits.
1365  *
1366  * @return void.
1367  */
1368
1369 static void _pam_warn_logon_type(struct pwb_context *ctx,
1370                                  const char *username,
1371                                  uint32_t info3_user_flgs)
1372 {
1373         /* inform about logon type */
1374         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1375
1376                 _make_remark(ctx, PAM_ERROR_MSG,
1377                              _("Grace login. "
1378                                "Please change your password as soon you're "
1379                                "online again"));
1380                 _pam_log_debug(ctx, LOG_DEBUG,
1381                                "User %s logged on using grace logon\n",
1382                                username);
1383
1384         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1385
1386                 _make_remark(ctx, PAM_ERROR_MSG,
1387                              _("Domain Controller unreachable, "
1388                                "using cached credentials instead. "
1389                                "Network resources may be unavailable"));
1390                 _pam_log_debug(ctx, LOG_DEBUG,
1391                                "User %s logged on using cached credentials\n",
1392                                username);
1393         }
1394 }
1395
1396 /**
1397  * Send PAM_ERROR_MSG for krb5 errors.
1398  *
1399  * @param ctx PAM winbind context.
1400  * @param username User in PAM request.
1401  * @param info3_user_flgs Info3 flags containing logon type bits.
1402  *
1403  * @return void.
1404  */
1405
1406 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1407                                    const char *username,
1408                                    uint32_t info3_user_flgs)
1409 {
1410         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1411                 _make_remark(ctx, PAM_ERROR_MSG,
1412                              _("Failed to establish your Kerberos Ticket cache "
1413                                "due time differences\n"
1414                                "with the domain controller.  "
1415                                "Please verify the system time.\n"));
1416                 _pam_log_debug(ctx, LOG_DEBUG,
1417                                "User %s: Clock skew when getting Krb5 TGT\n",
1418                                username);
1419         }
1420 }
1421
1422 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1423                                        const struct wbcAuthErrorInfo *e,
1424                                        const char *nt_status_string,
1425                                        int *pam_err)
1426 {
1427         const char *ntstatus = NULL;
1428         const char *error_string = NULL;
1429
1430         if (!e || !pam_err) {
1431                 return false;
1432         }
1433
1434         ntstatus = e->nt_string;
1435         if (!ntstatus) {
1436                 return false;
1437         }
1438
1439         if (strcasecmp(ntstatus, nt_status_string) == 0) {
1440
1441                 error_string = _get_ntstatus_error_string(nt_status_string);
1442                 if (error_string) {
1443                         _make_remark(ctx, PAM_ERROR_MSG, error_string);
1444                         *pam_err = e->pam_error;
1445                         return true;
1446                 }
1447
1448                 if (e->display_string) {
1449                         _make_remark(ctx, PAM_ERROR_MSG, _(e->display_string));
1450                         *pam_err = e->pam_error;
1451                         return true;
1452                 }
1453
1454                 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1455                 *pam_err = e->pam_error;
1456
1457                 return true;
1458         }
1459
1460         return false;
1461 };
1462
1463 /**
1464  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1465  *
1466  * @param i The wbcUserPasswordPolicyInfo struct.
1467  *
1468  * @return string (caller needs to talloc_free).
1469  */
1470
1471 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1472                                                  struct wbcUserPasswordPolicyInfo *i)
1473 {
1474         char *str = NULL;
1475
1476         if (!i) {
1477                 goto failed;
1478         }
1479
1480         str = talloc_asprintf(ctx, _("Your password "));
1481         if (!str) {
1482                 goto failed;
1483         }
1484
1485         if (i->min_length_password > 0) {
1486                 str = talloc_asprintf_append(str,
1487                                _("must be at least %d characters; "),
1488                                i->min_length_password);
1489                 if (!str) {
1490                         goto failed;
1491                 }
1492         }
1493
1494         if (i->password_history > 0) {
1495                 str = talloc_asprintf_append(str,
1496                                _("cannot repeat any of your previous %d "
1497                                 "passwords; "),
1498                                i->password_history);
1499                 if (!str) {
1500                         goto failed;
1501                 }
1502         }
1503
1504         if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1505                 str = talloc_asprintf_append(str,
1506                                _("must contain capitals, numerals "
1507                                  "or punctuation; "
1508                                  "and cannot contain your account "
1509                                  "or full name; "));
1510                 if (!str) {
1511                         goto failed;
1512                 }
1513         }
1514
1515         str = talloc_asprintf_append(str,
1516                        _("Please type a different password. "
1517                          "Type a password which meets these requirements in "
1518                          "both text boxes."));
1519         if (!str) {
1520                 goto failed;
1521         }
1522
1523         return str;
1524
1525  failed:
1526         TALLOC_FREE(str);
1527         return NULL;
1528 }
1529
1530 static int _pam_create_homedir(struct pwb_context *ctx,
1531                                const char *dirname,
1532                                mode_t mode)
1533 {
1534         struct stat sbuf;
1535
1536         if (stat(dirname, &sbuf) == 0) {
1537                 return PAM_SUCCESS;
1538         }
1539
1540         if (mkdir(dirname, mode) != 0) {
1541
1542                 _make_remark_format(ctx, PAM_TEXT_INFO,
1543                                     _("Creating directory: %s failed: %s"),
1544                                     dirname, strerror(errno));
1545                 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1546                  dirname, strerror(errno));
1547                  return PAM_PERM_DENIED;
1548         }
1549
1550         return PAM_SUCCESS;
1551 }
1552
1553 static int _pam_chown_homedir(struct pwb_context *ctx,
1554                               const char *dirname,
1555                               uid_t uid,
1556                               gid_t gid)
1557 {
1558         if (chown(dirname, uid, gid) != 0) {
1559                 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1560                          dirname, strerror(errno));
1561                 return PAM_PERM_DENIED;
1562         }
1563
1564         return PAM_SUCCESS;
1565 }
1566
1567 static int _pam_mkhomedir(struct pwb_context *ctx)
1568 {
1569         struct passwd *pwd = NULL;
1570         char *token = NULL;
1571         char *create_dir = NULL;
1572         char *user_dir = NULL;
1573         int ret;
1574         const char *username;
1575         mode_t mode = 0700;
1576         char *safe_ptr = NULL;
1577         char *p = NULL;
1578
1579         /* Get the username */
1580         ret = pam_get_user(ctx->pamh, &username, NULL);
1581         if ((ret != PAM_SUCCESS) || (!username)) {
1582                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1583                 return PAM_SERVICE_ERR;
1584         }
1585
1586         pwd = getpwnam(username);
1587         if (pwd == NULL) {
1588                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1589                 return PAM_USER_UNKNOWN;
1590         }
1591         _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1592
1593         ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1594         if (ret == PAM_SUCCESS) {
1595                 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1596                                          pwd->pw_uid,
1597                                          pwd->pw_gid);
1598         }
1599
1600         if (ret == PAM_SUCCESS) {
1601                 return ret;
1602         }
1603
1604         /* maybe we need to create parent dirs */
1605         create_dir = talloc_strdup(ctx, "/");
1606         if (!create_dir) {
1607                 return PAM_BUF_ERR;
1608         }
1609
1610         /* find final directory */
1611         user_dir = strrchr(pwd->pw_dir, '/');
1612         if (!user_dir) {
1613                 return PAM_BUF_ERR;
1614         }
1615         user_dir++;
1616
1617         _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1618
1619         p = pwd->pw_dir;
1620
1621         while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1622
1623                 mode = 0755;
1624
1625                 p = NULL;
1626
1627                 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1628
1629                 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1630                 if (!create_dir) {
1631                         return PAM_BUF_ERR;
1632                 }
1633                 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1634
1635                 if (strcmp(token, user_dir) == 0) {
1636                         _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1637                         mode = 0700;
1638                 }
1639
1640                 ret = _pam_create_homedir(ctx, create_dir, mode);
1641                 if (ret) {
1642                         return ret;
1643                 }
1644         }
1645
1646         return _pam_chown_homedir(ctx, create_dir,
1647                                   pwd->pw_uid,
1648                                   pwd->pw_gid);
1649 }
1650
1651 /* talk to winbindd */
1652 static int winbind_auth_request(struct pwb_context *ctx,
1653                                 const char *user,
1654                                 const char *pass,
1655                                 const char *member,
1656                                 const char *cctype,
1657                                 const int warn_pwd_expire,
1658                                 struct wbcAuthErrorInfo **p_error,
1659                                 struct wbcLogonUserInfo **p_info,
1660                                 struct wbcUserPasswordPolicyInfo **p_policy,
1661                                 time_t *pwd_last_set,
1662                                 char **user_ret)
1663 {
1664         wbcErr wbc_status;
1665
1666         struct wbcLogonUserParams logon;
1667         char membership_of[1024];
1668         uid_t user_uid = -1;
1669         uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1670                          WBFLAG_PAM_GET_PWD_POLICY;
1671
1672         struct wbcLogonUserInfo *info = NULL;
1673         struct wbcAuthUserInfo *user_info = NULL;
1674         struct wbcAuthErrorInfo *error = NULL;
1675         struct wbcUserPasswordPolicyInfo *policy = NULL;
1676
1677         int ret = PAM_AUTH_ERR;
1678         int i;
1679         const char *codes[] = {
1680                 "NT_STATUS_PASSWORD_EXPIRED",
1681                 "NT_STATUS_PASSWORD_MUST_CHANGE",
1682                 "NT_STATUS_INVALID_WORKSTATION",
1683                 "NT_STATUS_INVALID_LOGON_HOURS",
1684                 "NT_STATUS_ACCOUNT_EXPIRED",
1685                 "NT_STATUS_ACCOUNT_DISABLED",
1686                 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1687                 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1688                 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1689                 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1690                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1691                 "NT_STATUS_NO_LOGON_SERVERS",
1692                 "NT_STATUS_WRONG_PASSWORD",
1693                 "NT_STATUS_ACCESS_DENIED"
1694         };
1695
1696         if (pwd_last_set) {
1697                 *pwd_last_set = 0;
1698         }
1699
1700         /* Krb5 auth always has to go against the KDC of the user's realm */
1701
1702         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1703                 flags           |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1704         }
1705
1706         if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1707                 struct passwd *pwd = NULL;
1708
1709                 pwd = getpwnam(user);
1710                 if (pwd == NULL) {
1711                         return PAM_USER_UNKNOWN;
1712                 }
1713                 user_uid        = pwd->pw_uid;
1714         }
1715
1716         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1717
1718                 _pam_log_debug(ctx, LOG_DEBUG,
1719                                "enabling krb5 login flag\n");
1720
1721                 flags           |= WBFLAG_PAM_KRB5 |
1722                                    WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1723         }
1724
1725         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1726                 _pam_log_debug(ctx, LOG_DEBUG,
1727                                "enabling cached login flag\n");
1728                 flags           |= WBFLAG_PAM_CACHED_LOGIN;
1729         }
1730
1731         if (user_ret) {
1732                 *user_ret = NULL;
1733                 flags           |= WBFLAG_PAM_UNIX_NAME;
1734         }
1735
1736         if (cctype != NULL) {
1737                 _pam_log_debug(ctx, LOG_DEBUG,
1738                                "enabling request for a %s krb5 ccache\n",
1739                                cctype);
1740         }
1741
1742         if (member != NULL) {
1743
1744                 ZERO_STRUCT(membership_of);
1745
1746                 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1747                                                           membership_of,
1748                                                           sizeof(membership_of))) {
1749                         _pam_log_debug(ctx, LOG_ERR,
1750                                        "failed to serialize membership of sid "
1751                                        "\"%s\"\n", member);
1752                         return PAM_AUTH_ERR;
1753                 }
1754         }
1755
1756         ZERO_STRUCT(logon);
1757
1758         logon.username                  = user;
1759         logon.password                  = pass;
1760
1761         if (cctype) {
1762                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1763                                              &logon.blobs,
1764                                              "krb5_cc_type",
1765                                              0,
1766                                              discard_const_p(uint8_t, cctype),
1767                                              strlen(cctype)+1);
1768                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1769                         goto done;
1770                 }
1771         }
1772
1773         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1774                                      &logon.blobs,
1775                                      "flags",
1776                                      0,
1777                                      (uint8_t *)&flags,
1778                                      sizeof(flags));
1779         if (!WBC_ERROR_IS_OK(wbc_status)) {
1780                 goto done;
1781         }
1782
1783         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1784                                      &logon.blobs,
1785                                      "user_uid",
1786                                      0,
1787                                      (uint8_t *)&user_uid,
1788                                      sizeof(user_uid));
1789         if (!WBC_ERROR_IS_OK(wbc_status)) {
1790                 goto done;
1791         }
1792
1793         if (member) {
1794                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1795                                              &logon.blobs,
1796                                              "membership_of",
1797                                              0,
1798                                              (uint8_t *)membership_of,
1799                                              sizeof(membership_of));
1800                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1801                         goto done;
1802                 }
1803         }
1804
1805         wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1806         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1807                                           user, "wbcLogonUser");
1808         wbcFreeMemory(logon.blobs);
1809         logon.blobs = NULL;
1810
1811         if (info && info->info) {
1812                 user_info = info->info;
1813         }
1814
1815         if (pwd_last_set && user_info) {
1816                 *pwd_last_set = user_info->pass_last_set_time;
1817         }
1818
1819         if (p_info && info) {
1820                 *p_info = info;
1821         }
1822
1823         if (p_policy && policy) {
1824                 *p_policy = policy;
1825         }
1826
1827         if (p_error && error) {
1828                 /* We want to process the error in the caller. */
1829                 *p_error = error;
1830                 return ret;
1831         }
1832
1833         for (i=0; i<ARRAY_SIZE(codes); i++) {
1834                 int _ret = ret;
1835                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1836                         ret = _ret;
1837                         goto done;
1838                 }
1839         }
1840
1841         if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1842
1843                 bool already_expired = false;
1844                 bool change_pwd = false;
1845
1846                 /* warn a user if the password is about to expire soon */
1847                 _pam_warn_password_expiry(ctx, user_info, policy,
1848                                           warn_pwd_expire,
1849                                           &already_expired,
1850                                           &change_pwd);
1851
1852                 if (already_expired == true) {
1853
1854                         SMB_TIME_T last_set = user_info->pass_last_set_time;
1855
1856                         _pam_log_debug(ctx, LOG_DEBUG,
1857                                        "Password has expired "
1858                                        "(Password was last set: %lld, "
1859                                        "the policy says it should expire here "
1860                                        "%lld (now it's: %ld))\n",
1861                                        (long long int)last_set,
1862                                        (long long int)last_set +
1863                                        policy->expire,
1864                                        (long)time(NULL));
1865
1866                         return PAM_AUTHTOK_EXPIRED;
1867                 }
1868
1869                 if (change_pwd) {
1870                         ret = PAM_NEW_AUTHTOK_REQD;
1871                         goto done;
1872                 }
1873
1874                 /* inform about logon type */
1875                 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1876
1877                 /* inform about krb5 failures */
1878                 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1879
1880                 /* set some info3 info for other modules in the stack */
1881                 _pam_set_data_info3(ctx, user_info);
1882
1883                 /* put krb5ccname into env */
1884                 _pam_setup_krb5_env(ctx, info);
1885
1886                 /* If winbindd returned a username, return the pointer to it
1887                  * here. */
1888                 _pam_setup_unix_username(ctx, user_ret, info);
1889         }
1890
1891  done:
1892         wbcFreeMemory(logon.blobs);
1893         if (info && info->blobs && !p_info) {
1894                 wbcFreeMemory(info->blobs);
1895         }
1896         if (error && !p_error) {
1897                 wbcFreeMemory(error);
1898         }
1899         if (info && !p_info) {
1900                 wbcFreeMemory(info);
1901         }
1902         if (policy && !p_policy) {
1903                 wbcFreeMemory(policy);
1904         }
1905
1906         return ret;
1907 }
1908
1909 /* talk to winbindd */
1910 static int winbind_chauthtok_request(struct pwb_context *ctx,
1911                                      const char *user,
1912                                      const char *oldpass,
1913                                      const char *newpass,
1914                                      time_t pwd_last_set)
1915 {
1916         wbcErr wbc_status;
1917         struct wbcChangePasswordParams params;
1918         struct wbcAuthErrorInfo *error = NULL;
1919         struct wbcUserPasswordPolicyInfo *policy = NULL;
1920         enum wbcPasswordChangeRejectReason reject_reason = -1;
1921         uint32_t flags = 0;
1922
1923         int i;
1924         const char *codes[] = {
1925                 "NT_STATUS_BACKUP_CONTROLLER",
1926                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1927                 "NT_STATUS_NO_LOGON_SERVERS",
1928                 "NT_STATUS_ACCESS_DENIED",
1929                 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1930                 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1931                 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1932         };
1933         int ret = PAM_AUTH_ERR;
1934
1935         ZERO_STRUCT(params);
1936
1937         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1938                 flags |= WBFLAG_PAM_KRB5 |
1939                          WBFLAG_PAM_CONTACT_TRUSTDOM;
1940         }
1941
1942         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1943                 flags |= WBFLAG_PAM_CACHED_LOGIN;
1944         }
1945
1946         params.account_name             = user;
1947         params.level                    = WBC_AUTH_USER_LEVEL_PLAIN;
1948         params.old_password.plaintext   = oldpass;
1949         params.new_password.plaintext   = newpass;
1950         params.flags                    = flags;
1951
1952         wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1953         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1954                                           user, "wbcChangeUserPasswordEx");
1955
1956         if (WBC_ERROR_IS_OK(wbc_status)) {
1957                 _pam_log(ctx, LOG_NOTICE,
1958                          "user '%s' password changed", user);
1959                 return PAM_SUCCESS;
1960         }
1961
1962         if (!error) {
1963                 wbcFreeMemory(policy);
1964                 return ret;
1965         }
1966
1967         for (i=0; i<ARRAY_SIZE(codes); i++) {
1968                 int _ret = ret;
1969                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1970                         ret = _ret;
1971                         goto done;
1972                 }
1973         }
1974
1975         if (!strcasecmp(error->nt_string,
1976                         "NT_STATUS_PASSWORD_RESTRICTION")) {
1977
1978                 char *pwd_restriction_string = NULL;
1979                 SMB_TIME_T min_pwd_age = 0;
1980
1981                 if (policy) {
1982                         min_pwd_age     = policy->min_passwordage;
1983                 }
1984
1985                 /* FIXME: avoid to send multiple PAM messages after another */
1986                 switch (reject_reason) {
1987                         case -1:
1988                                 break;
1989                         case WBC_PWD_CHANGE_NO_ERROR:
1990                                 if ((min_pwd_age > 0) &&
1991                                     (pwd_last_set + min_pwd_age > time(NULL))) {
1992                                         PAM_WB_REMARK_DIRECT(ctx,
1993                                              "NT_STATUS_PWD_TOO_RECENT");
1994                                 }
1995                                 break;
1996                         case WBC_PWD_CHANGE_PASSWORD_TOO_SHORT:
1997                                 PAM_WB_REMARK_DIRECT(ctx,
1998                                         "NT_STATUS_PWD_TOO_SHORT");
1999                                 break;
2000                         case WBC_PWD_CHANGE_PWD_IN_HISTORY:
2001                                 PAM_WB_REMARK_DIRECT(ctx,
2002                                         "NT_STATUS_PWD_HISTORY_CONFLICT");
2003                                 break;
2004                         case WBC_PWD_CHANGE_NOT_COMPLEX:
2005                                 _make_remark(ctx, PAM_ERROR_MSG,
2006                                              _("Password does not meet "
2007                                                "complexity requirements"));
2008                                 break;
2009                         default:
2010                                 _pam_log_debug(ctx, LOG_DEBUG,
2011                                                "unknown password change "
2012                                                "reject reason: %d",
2013                                                reject_reason);
2014                                 break;
2015                 }
2016
2017                 pwd_restriction_string =
2018                         _pam_compose_pwd_restriction_string(ctx, policy);
2019                 if (pwd_restriction_string) {
2020                         _make_remark(ctx, PAM_ERROR_MSG,
2021                                      pwd_restriction_string);
2022                         TALLOC_FREE(pwd_restriction_string);
2023                 }
2024         }
2025  done:
2026         wbcFreeMemory(error);
2027         wbcFreeMemory(policy);
2028
2029         return ret;
2030 }
2031
2032 /*
2033  * Checks if a user has an account
2034  *
2035  * return values:
2036  *       1  = User not found
2037  *       0  = OK
2038  *      -1  = System error
2039  */
2040 static int valid_user(struct pwb_context *ctx,
2041                       const char *user)
2042 {
2043         /* check not only if the user is available over NSS calls, also make
2044          * sure it's really a winbind user, this is important when stacking PAM
2045          * modules in the 'account' or 'password' facility. */
2046
2047         wbcErr wbc_status;
2048         struct passwd *pwd = NULL;
2049         struct passwd *wb_pwd = NULL;
2050
2051         pwd = getpwnam(user);
2052         if (pwd == NULL) {
2053                 return 1;
2054         }
2055
2056         wbc_status = wbcGetpwnam(user, &wb_pwd);
2057         wbcFreeMemory(wb_pwd);
2058         if (!WBC_ERROR_IS_OK(wbc_status)) {
2059                 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
2060                         wbcErrorString(wbc_status));
2061         }
2062
2063         switch (wbc_status) {
2064                 case WBC_ERR_UNKNOWN_USER:
2065                         return 1;
2066                 case WBC_ERR_SUCCESS:
2067                         return 0;
2068                 default:
2069                         break;
2070         }
2071         return -1;
2072 }
2073
2074 static char *_pam_delete(register char *xx)
2075 {
2076         _pam_overwrite(xx);
2077         _pam_drop(xx);
2078         return NULL;
2079 }
2080
2081 /*
2082  * obtain a password from the user
2083  */
2084
2085 static int _winbind_read_password(struct pwb_context *ctx,
2086                                   unsigned int ctrl,
2087                                   const char *comment,
2088                                   const char *prompt1,
2089                                   const char *prompt2,
2090                                   const char **pass)
2091 {
2092         int authtok_flag;
2093         int retval;
2094         const char *item;
2095         char *token;
2096
2097         _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2098
2099         /*
2100          * make sure nothing inappropriate gets returned
2101          */
2102
2103         *pass = token = NULL;
2104
2105         /*
2106          * which authentication token are we getting?
2107          */
2108
2109         if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2110                 authtok_flag = PAM_OLDAUTHTOK;
2111         } else {
2112                 authtok_flag = PAM_AUTHTOK;
2113         }
2114
2115         /*
2116          * should we obtain the password from a PAM item ?
2117          */
2118
2119         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2120             on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2121                 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
2122                 if (retval != PAM_SUCCESS) {
2123                         /* very strange. */
2124                         _pam_log(ctx, LOG_ALERT,
2125                                  "pam_get_item returned error "
2126                                  "to unix-read-password");
2127                         return retval;
2128                 } else if (item != NULL) {      /* we have a password! */
2129                         *pass = item;
2130                         item = NULL;
2131                         _pam_log(ctx, LOG_DEBUG,
2132                                  "pam_get_item returned a password");
2133                         return PAM_SUCCESS;
2134                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2135                         return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2136                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2137                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
2138                         return PAM_AUTHTOK_RECOVER_ERR;
2139                 }
2140         }
2141         /*
2142          * getting here implies we will have to get the password from the
2143          * user directly.
2144          */
2145
2146         {
2147                 struct pam_message msg[3], *pmsg[3];
2148                 struct pam_response *resp;
2149                 int i, replies;
2150
2151                 /* prepare to converse */
2152
2153                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2154                         pmsg[0] = &msg[0];
2155                         msg[0].msg_style = PAM_TEXT_INFO;
2156                         msg[0].msg = discard_const_p(char, comment);
2157                         i = 1;
2158                 } else {
2159                         i = 0;
2160                 }
2161
2162                 pmsg[i] = &msg[i];
2163                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2164                 msg[i++].msg = discard_const_p(char, prompt1);
2165                 replies = 1;
2166
2167                 if (prompt2 != NULL) {
2168                         pmsg[i] = &msg[i];
2169                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2170                         msg[i++].msg = discard_const_p(char, prompt2);
2171                         ++replies;
2172                 }
2173                 /* so call the conversation expecting i responses */
2174                 resp = NULL;
2175                 retval = converse(ctx->pamh, i, pmsg, &resp);
2176                 if (resp == NULL) {
2177                         if (retval == PAM_SUCCESS) {
2178                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2179                         }
2180                         goto done;
2181                 }
2182                 if (retval != PAM_SUCCESS) {
2183                         _pam_drop_reply(resp, i);
2184                         goto done;
2185                 }
2186
2187                 /* interpret the response */
2188
2189                 token = x_strdup(resp[i - replies].resp);
2190                 if (!token) {
2191                         _pam_log(ctx, LOG_NOTICE,
2192                                  "could not recover "
2193                                  "authentication token");
2194                         retval = PAM_AUTHTOK_RECOVER_ERR;
2195                         goto done;
2196                 }
2197
2198                 if (replies == 2) {
2199                         /* verify that password entered correctly */
2200                         if (!resp[i - 1].resp ||
2201                             strcmp(token, resp[i - 1].resp)) {
2202                                 _pam_delete(token);     /* mistyped */
2203                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2204                                 _make_remark(ctx, PAM_ERROR_MSG,
2205                                              MISTYPED_PASS);
2206                         }
2207                 }
2208
2209                 /*
2210                  * tidy up the conversation (resp_retcode) is ignored
2211                  * -- what is it for anyway? AGM
2212                  */
2213                 _pam_drop_reply(resp, i);
2214         }
2215
2216  done:
2217         if (retval != PAM_SUCCESS) {
2218                 _pam_log_debug(ctx, LOG_DEBUG,
2219                                "unable to obtain a password");
2220                 return retval;
2221         }
2222         /* 'token' is the entered password */
2223
2224         /* we store this password as an item */
2225
2226         retval = pam_set_item(ctx->pamh, authtok_flag, token);
2227         _pam_delete(token);     /* clean it up */
2228         if (retval != PAM_SUCCESS ||
2229             (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
2230
2231                 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2232                 return retval;
2233
2234         }
2235
2236         *pass = item;
2237         item = NULL;            /* break link to password */
2238
2239         return PAM_SUCCESS;
2240 }
2241
2242 static const char *get_conf_item_string(struct pwb_context *ctx,
2243                                         const char *item,
2244                                         int config_flag)
2245 {
2246         int i = 0;
2247         const char *parm_opt = NULL;
2248
2249         if (!(ctx->ctrl & config_flag)) {
2250                 goto out;
2251         }
2252
2253         /* let the pam opt take precedence over the pam_winbind.conf option */
2254         for (i=0; i<ctx->argc; i++) {
2255
2256                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2257                         char *p;
2258
2259                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2260                                 _pam_log(ctx, LOG_INFO,
2261                                          "no \"=\" delimiter for \"%s\" found\n",
2262                                          item);
2263                                 goto out;
2264                         }
2265                         _pam_log_debug(ctx, LOG_INFO,
2266                                        "PAM config: %s '%s'\n", item, p+1);
2267                         return p + 1;
2268                 }
2269         }
2270
2271         if (ctx->dict) {
2272                 char *key = NULL;
2273
2274                 key = talloc_asprintf(ctx, "global:%s", item);
2275                 if (!key) {
2276                         goto out;
2277                 }
2278
2279                 parm_opt = iniparser_getstr(ctx->dict, key);
2280                 TALLOC_FREE(key);
2281
2282                 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2283                                item, parm_opt);
2284         }
2285 out:
2286         return parm_opt;
2287 }
2288
2289 static int get_config_item_int(struct pwb_context *ctx,
2290                                const char *item,
2291                                int config_flag)
2292 {
2293         int i, parm_opt = -1;
2294
2295         if (!(ctx->ctrl & config_flag)) {
2296                 goto out;
2297         }
2298
2299         /* let the pam opt take precedence over the pam_winbind.conf option */
2300         for (i = 0; i < ctx->argc; i++) {
2301
2302                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2303                         char *p;
2304
2305                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2306                                 _pam_log(ctx, LOG_INFO,
2307                                          "no \"=\" delimiter for \"%s\" found\n",
2308                                          item);
2309                                 goto out;
2310                         }
2311                         parm_opt = atoi(p + 1);
2312                         _pam_log_debug(ctx, LOG_INFO,
2313                                        "PAM config: %s '%d'\n",
2314                                        item, parm_opt);
2315                         return parm_opt;
2316                 }
2317         }
2318
2319         if (ctx->dict) {
2320                 char *key = NULL;
2321
2322                 key = talloc_asprintf(ctx, "global:%s", item);
2323                 if (!key) {
2324                         goto out;
2325                 }
2326
2327                 parm_opt = iniparser_getint(ctx->dict, key, -1);
2328                 TALLOC_FREE(key);
2329
2330                 _pam_log_debug(ctx, LOG_INFO,
2331                                "CONFIG file: %s '%d'\n",
2332                                item, parm_opt);
2333         }
2334 out:
2335         return parm_opt;
2336 }
2337
2338 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2339 {
2340         return get_conf_item_string(ctx, "krb5_ccache_type",
2341                                     WINBIND_KRB5_CCACHE_TYPE);
2342 }
2343
2344 static const char *get_member_from_config(struct pwb_context *ctx)
2345 {
2346         const char *ret = NULL;
2347         ret = get_conf_item_string(ctx, "require_membership_of",
2348                                    WINBIND_REQUIRED_MEMBERSHIP);
2349         if (ret) {
2350                 return ret;
2351         }
2352         return get_conf_item_string(ctx, "require-membership-of",
2353                                     WINBIND_REQUIRED_MEMBERSHIP);
2354 }
2355
2356 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2357 {
2358         int ret;
2359         ret = get_config_item_int(ctx, "warn_pwd_expire",
2360                                   WINBIND_WARN_PWD_EXPIRE);
2361         /* no or broken setting */
2362         if (ret <= 0) {
2363                 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2364         }
2365         return ret;
2366 }
2367
2368 /**
2369  * Retrieve the winbind separator.
2370  *
2371  * @param ctx PAM winbind context.
2372  *
2373  * @return string separator character. NULL on failure.
2374  */
2375
2376 static char winbind_get_separator(struct pwb_context *ctx)
2377 {
2378         wbcErr wbc_status;
2379         static struct wbcInterfaceDetails *details = NULL;
2380
2381         wbc_status = wbcInterfaceDetails(&details);
2382         if (!WBC_ERROR_IS_OK(wbc_status)) {
2383                 _pam_log(ctx, LOG_ERR,
2384                          "Could not retrieve winbind interface details: %s",
2385                          wbcErrorString(wbc_status));
2386                 return '\0';
2387         }
2388
2389         if (!details) {
2390                 return '\0';
2391         }
2392
2393         return details->winbind_separator;
2394 }
2395
2396
2397 /**
2398  * Convert a upn to a name.
2399  *
2400  * @param ctx PAM winbind context.
2401  * @param upn  USer UPN to be trabslated.
2402  *
2403  * @return converted name. NULL pointer on failure. Caller needs to free.
2404  */
2405
2406 static char* winbind_upn_to_username(struct pwb_context *ctx,
2407                                      const char *upn)
2408 {
2409         char sep;
2410         wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2411         struct wbcDomainSid sid;
2412         enum wbcSidType type;
2413         char *domain = NULL;
2414         char *name;
2415         char *p;
2416
2417         /* This cannot work when the winbind separator = @ */
2418
2419         sep = winbind_get_separator(ctx);
2420         if (!sep || sep == '@') {
2421                 return NULL;
2422         }
2423
2424         name = talloc_strdup(ctx, upn);
2425         if (!name) {
2426                 return NULL;
2427         }
2428         if ((p = strchr(name, '@')) != NULL) {
2429                 *p = 0;
2430                 domain = p + 1;
2431         }
2432
2433         /* Convert the UPN to a SID */
2434
2435         wbc_status = wbcLookupName(domain, name, &sid, &type);
2436         if (!WBC_ERROR_IS_OK(wbc_status)) {
2437                 return NULL;
2438         }
2439
2440         /* Convert the the SID back to the sAMAccountName */
2441
2442         wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2443         if (!WBC_ERROR_IS_OK(wbc_status)) {
2444                 return NULL;
2445         }
2446
2447         return talloc_asprintf(ctx, "%s\\%s", domain, name);
2448 }
2449
2450 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2451                          int argc, const char **argv)
2452 {
2453         int retval = PAM_SUCCESS;
2454         struct pwb_context *ctx = NULL;
2455         struct wbcLogoffUserParams logoff;
2456         struct wbcAuthErrorInfo *error = NULL;
2457         const char *user;
2458         wbcErr wbc_status = WBC_ERR_SUCCESS;
2459
2460         ZERO_STRUCT(logoff);
2461
2462         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2463         if (retval) {
2464                 goto out;
2465         }
2466
2467         _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2468
2469         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2470
2471                 /* destroy the ccache here */
2472
2473                 uint32_t wbc_flags = 0;
2474                 const char *ccname = NULL;
2475                 struct passwd *pwd = NULL;
2476
2477                 retval = pam_get_user(pamh, &user, _("Username: "));
2478                 if (retval) {
2479                         _pam_log(ctx, LOG_ERR,
2480                                  "could not identify user");
2481                         goto out;
2482                 }
2483
2484                 if (user == NULL) {
2485                         _pam_log(ctx, LOG_ERR,
2486                                  "username was NULL!");
2487                         retval = PAM_USER_UNKNOWN;
2488                         goto out;
2489                 }
2490
2491                 _pam_log_debug(ctx, LOG_DEBUG,
2492                                "username [%s] obtained", user);
2493
2494                 ccname = pam_getenv(pamh, "KRB5CCNAME");
2495                 if (ccname == NULL) {
2496                         _pam_log_debug(ctx, LOG_DEBUG,
2497                                        "user has no KRB5CCNAME environment");
2498                 }
2499
2500                 pwd = getpwnam(user);
2501                 if (pwd == NULL) {
2502                         retval = PAM_USER_UNKNOWN;
2503                         goto out;
2504                 }
2505
2506                 wbc_flags = WBFLAG_PAM_KRB5 |
2507                         WBFLAG_PAM_CONTACT_TRUSTDOM;
2508
2509                 logoff.username         = user;
2510
2511                 if (ccname) {
2512                         wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2513                                                      &logoff.blobs,
2514                                                      "ccfilename",
2515                                                      0,
2516                                                      discard_const_p(uint8_t, ccname),
2517                                                      strlen(ccname)+1);
2518                         if (!WBC_ERROR_IS_OK(wbc_status)) {
2519                                 goto out;
2520                         }
2521                 }
2522
2523                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2524                                              &logoff.blobs,
2525                                              "flags",
2526                                              0,
2527                                              (uint8_t *)&wbc_flags,
2528                                              sizeof(wbc_flags));
2529                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2530                         goto out;
2531                 }
2532
2533                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2534                                              &logoff.blobs,
2535                                              "user_uid",
2536                                              0,
2537                                              (uint8_t *)&pwd->pw_uid,
2538                                              sizeof(pwd->pw_uid));
2539                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2540                         goto out;
2541                 }
2542
2543                 wbc_status = wbcLogoffUserEx(&logoff, &error);
2544                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2545                                                      user, "wbcLogoffUser");
2546                 wbcFreeMemory(error);
2547                 wbcFreeMemory(logoff.blobs);
2548                 logoff.blobs = NULL;
2549
2550                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2551                         _pam_log(ctx, LOG_INFO,
2552                                  "failed to logoff user %s: %s\n",
2553                                          user, wbcErrorString(wbc_status));
2554                 }
2555         }
2556
2557 out:
2558         if (logoff.blobs) {
2559                 wbcFreeMemory(logoff.blobs);
2560         }
2561
2562         if (!WBC_ERROR_IS_OK(wbc_status)) {
2563                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2564                      user, "wbcLogoffUser");
2565         }
2566
2567         /*
2568          * Delete the krb5 ccname variable from the PAM environment
2569          * if it was set by winbind.
2570          */
2571         if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2572                 pam_putenv(pamh, "KRB5CCNAME");
2573         }
2574
2575         _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2576
2577         TALLOC_FREE(ctx);
2578
2579         return retval;
2580 }
2581
2582 PAM_EXTERN
2583 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2584                         int argc, const char **argv)
2585 {
2586         const char *username;
2587         const char *password;
2588         const char *member = NULL;
2589         const char *cctype = NULL;
2590         int warn_pwd_expire;
2591         int retval = PAM_AUTH_ERR;
2592         char *username_ret = NULL;
2593         char *new_authtok_required = NULL;
2594         char *real_username = NULL;
2595         struct pwb_context *ctx = NULL;
2596
2597         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2598         if (retval) {
2599                 goto out;
2600         }
2601
2602         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2603
2604         /* Get the username */
2605         retval = pam_get_user(pamh, &username, NULL);
2606         if ((retval != PAM_SUCCESS) || (!username)) {
2607                 _pam_log_debug(ctx, LOG_DEBUG,
2608                                "can not get the username");
2609                 retval = PAM_SERVICE_ERR;
2610                 goto out;
2611         }
2612
2613
2614 #if defined(AIX)
2615         /* Decode the user name since AIX does not support logn user
2616            names by default.  The name is encoded as _#uid.  */
2617
2618         if (username[0] == '_') {
2619                 uid_t id = atoi(&username[1]);
2620                 struct passwd *pw = NULL;
2621
2622                 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2623                         real_username = strdup(pw->pw_name);
2624                 }
2625         }
2626 #endif
2627
2628         if (!real_username) {
2629                 /* Just making a copy of the username we got from PAM */
2630                 if ((real_username = strdup(username)) == NULL) {
2631                         _pam_log_debug(ctx, LOG_DEBUG,
2632                                        "memory allocation failure when copying "
2633                                        "username");
2634                         retval = PAM_SERVICE_ERR;
2635                         goto out;
2636                 }
2637         }
2638
2639         /* Maybe this was a UPN */
2640
2641         if (strchr(real_username, '@') != NULL) {
2642                 char *samaccountname = NULL;
2643
2644                 samaccountname = winbind_upn_to_username(ctx,
2645                                                          real_username);
2646                 if (samaccountname) {
2647                         free(real_username);
2648                         real_username = strdup(samaccountname);
2649                 }
2650         }
2651
2652         retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2653                                         _("Password: "), NULL,
2654                                         &password);
2655
2656         if (retval != PAM_SUCCESS) {
2657                 _pam_log(ctx, LOG_ERR,
2658                          "Could not retrieve user's password");
2659                 retval = PAM_AUTHTOK_ERR;
2660                 goto out;
2661         }
2662
2663         /* Let's not give too much away in the log file */
2664
2665 #ifdef DEBUG_PASSWORD
2666         _pam_log_debug(ctx, LOG_INFO,
2667                        "Verify user '%s' with password '%s'",
2668                        real_username, password);
2669 #else
2670         _pam_log_debug(ctx, LOG_INFO,
2671                        "Verify user '%s'", real_username);
2672 #endif
2673
2674         member = get_member_from_config(ctx);
2675         cctype = get_krb5_cc_type_from_config(ctx);
2676         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2677
2678         /* Now use the username to look up password */
2679         retval = winbind_auth_request(ctx, real_username, password,
2680                                       member, cctype, warn_pwd_expire,
2681                                       NULL, NULL, NULL,
2682                                       NULL, &username_ret);
2683
2684         if (retval == PAM_NEW_AUTHTOK_REQD ||
2685             retval == PAM_AUTHTOK_EXPIRED) {
2686
2687                 char *new_authtok_required_during_auth = NULL;
2688
2689                 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2690                 if (!new_authtok_required) {
2691                         retval = PAM_BUF_ERR;
2692                         goto out;
2693                 }
2694
2695                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2696                              new_authtok_required,
2697                              _pam_winbind_cleanup_func);
2698
2699                 retval = PAM_SUCCESS;
2700
2701                 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2702                 if (!new_authtok_required_during_auth) {
2703                         retval = PAM_BUF_ERR;
2704                         goto out;
2705                 }
2706
2707                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2708                              new_authtok_required_during_auth,
2709                              _pam_winbind_cleanup_func);
2710
2711                 goto out;
2712         }
2713
2714 out:
2715         if (username_ret) {
2716                 pam_set_item (pamh, PAM_USER, username_ret);
2717                 _pam_log_debug(ctx, LOG_INFO,
2718                                "Returned user was '%s'", username_ret);
2719                 free(username_ret);
2720         }
2721
2722         if (real_username) {
2723                 free(real_username);
2724         }
2725
2726         if (!new_authtok_required) {
2727                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2728         }
2729
2730         if (retval != PAM_SUCCESS) {
2731                 _pam_free_data_info3(pamh);
2732         }
2733
2734         _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2735
2736         TALLOC_FREE(ctx);
2737
2738         return retval;
2739 }
2740
2741 PAM_EXTERN
2742 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2743                    int argc, const char **argv)
2744 {
2745         int ret = PAM_SYSTEM_ERR;
2746         struct pwb_context *ctx = NULL;
2747
2748         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2749         if (ret) {
2750                 goto out;
2751         }
2752
2753         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2754
2755         switch (flags & ~PAM_SILENT) {
2756
2757                 case PAM_DELETE_CRED:
2758                         ret = _pam_delete_cred(pamh, flags, argc, argv);
2759                         break;
2760                 case PAM_REFRESH_CRED:
2761                         _pam_log_debug(ctx, LOG_WARNING,
2762                                        "PAM_REFRESH_CRED not implemented");
2763                         ret = PAM_SUCCESS;
2764                         break;
2765                 case PAM_REINITIALIZE_CRED:
2766                         _pam_log_debug(ctx, LOG_WARNING,
2767                                        "PAM_REINITIALIZE_CRED not implemented");
2768                         ret = PAM_SUCCESS;
2769                         break;
2770                 case PAM_ESTABLISH_CRED:
2771                         _pam_log_debug(ctx, LOG_WARNING,
2772                                        "PAM_ESTABLISH_CRED not implemented");
2773                         ret = PAM_SUCCESS;
2774                         break;
2775                 default:
2776                         ret = PAM_SYSTEM_ERR;
2777                         break;
2778         }
2779
2780  out:
2781
2782         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2783
2784         TALLOC_FREE(ctx);
2785
2786         return ret;
2787 }
2788
2789 /*
2790  * Account management. We want to verify that the account exists
2791  * before returning PAM_SUCCESS
2792  */
2793 PAM_EXTERN
2794 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2795                    int argc, const char **argv)
2796 {
2797         const char *username;
2798         int ret = PAM_USER_UNKNOWN;
2799         void *tmp = NULL;
2800         struct pwb_context *ctx = NULL;
2801
2802         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2803         if (ret) {
2804                 goto out;
2805         }
2806
2807         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2808
2809
2810         /* Get the username */
2811         ret = pam_get_user(pamh, &username, NULL);
2812         if ((ret != PAM_SUCCESS) || (!username)) {
2813                 _pam_log_debug(ctx, LOG_DEBUG,
2814                                "can not get the username");
2815                 ret = PAM_SERVICE_ERR;
2816                 goto out;
2817         }
2818
2819         /* Verify the username */
2820         ret = valid_user(ctx, username);
2821         switch (ret) {
2822         case -1:
2823                 /* some sort of system error. The log was already printed */
2824                 ret = PAM_SERVICE_ERR;
2825                 goto out;
2826         case 1:
2827                 /* the user does not exist */
2828                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2829                                username);
2830                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2831                         ret = PAM_IGNORE;
2832                         goto out;
2833                 }
2834                 ret = PAM_USER_UNKNOWN;
2835                 goto out;
2836         case 0:
2837                 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2838                              (const void **)&tmp);
2839                 if (tmp != NULL) {
2840                         ret = atoi((const char *)tmp);
2841                         switch (ret) {
2842                         case PAM_AUTHTOK_EXPIRED:
2843                                 /* fall through, since new token is required in this case */
2844                         case PAM_NEW_AUTHTOK_REQD:
2845                                 _pam_log(ctx, LOG_WARNING,
2846                                          "pam_sm_acct_mgmt success but %s is set",
2847                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
2848                                 _pam_log(ctx, LOG_NOTICE,
2849                                          "user '%s' needs new password",
2850                                          username);
2851                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2852                                 ret = PAM_NEW_AUTHTOK_REQD;
2853                                 goto out;
2854                         default:
2855                                 _pam_log(ctx, LOG_WARNING,
2856                                          "pam_sm_acct_mgmt success");
2857                                 _pam_log(ctx, LOG_NOTICE,
2858                                          "user '%s' granted access", username);
2859                                 ret = PAM_SUCCESS;
2860                                 goto out;
2861                         }
2862                 }
2863
2864                 /* Otherwise, the authentication looked good */
2865                 _pam_log(ctx, LOG_NOTICE,
2866                          "user '%s' granted access", username);
2867                 ret = PAM_SUCCESS;
2868                 goto out;
2869         default:
2870                 /* we don't know anything about this return value */
2871                 _pam_log(ctx, LOG_ERR,
2872                          "internal module error (ret = %d, user = '%s')",
2873                          ret, username);
2874                 ret = PAM_SERVICE_ERR;
2875                 goto out;
2876         }
2877
2878         /* should not be reached */
2879         ret = PAM_IGNORE;
2880
2881  out:
2882
2883         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2884
2885         TALLOC_FREE(ctx);
2886
2887         return ret;
2888 }
2889
2890 PAM_EXTERN
2891 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2892                         int argc, const char **argv)
2893 {
2894         int ret = PAM_SUCCESS;
2895         struct pwb_context *ctx = NULL;
2896
2897         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2898         if (ret) {
2899                 goto out;
2900         }
2901
2902         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2903
2904         if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2905                 /* check and create homedir */
2906                 ret = _pam_mkhomedir(ctx);
2907         }
2908  out:
2909         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2910
2911         TALLOC_FREE(ctx);
2912
2913         return ret;
2914 }
2915
2916 PAM_EXTERN
2917 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2918                          int argc, const char **argv)
2919 {
2920         int ret = PAM_SUCCESS;
2921         struct pwb_context *ctx = NULL;
2922
2923         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2924         if (ret) {
2925                 goto out;
2926         }
2927
2928         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2929
2930 out:
2931         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2932
2933         TALLOC_FREE(ctx);
2934
2935         return ret;
2936 }
2937
2938 /**
2939  * evaluate whether we need to re-authenticate with kerberos after a
2940  * password change
2941  *
2942  * @param ctx PAM winbind context.
2943  * @param user The username
2944  *
2945  * @return boolean Returns true if required, false if not.
2946  */
2947
2948 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2949                                                    const char *user)
2950 {
2951
2952         /* Make sure that we only do this if a) the chauthtok got initiated
2953          * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2954          * later password change via the "passwd" command if done by the user
2955          * itself
2956          * NB. If we login from gdm or xdm and the password expires,
2957          * we change the password, but there is no memory cache.
2958          * Thus, even for passthrough login, we should do the
2959          * authentication again to update memory cache.
2960          * --- BoYang
2961          * */
2962
2963         char *new_authtok_reqd_during_auth = NULL;
2964         struct passwd *pwd = NULL;
2965
2966         _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2967                       &new_authtok_reqd_during_auth);
2968         pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2969                      NULL, NULL);
2970
2971         if (new_authtok_reqd_during_auth) {
2972                 return true;
2973         }
2974
2975         pwd = getpwnam(user);
2976         if (!pwd) {
2977                 return false;
2978         }
2979
2980         if (getuid() == pwd->pw_uid) {
2981                 return true;
2982         }
2983
2984         return false;
2985 }
2986
2987
2988 PAM_EXTERN
2989 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2990                      int argc, const char **argv)
2991 {
2992         unsigned int lctrl;
2993         int ret;
2994         bool cached_login = false;
2995
2996         /* <DO NOT free() THESE> */
2997         const char *user;
2998         char *pass_old, *pass_new;
2999         /* </DO NOT free() THESE> */
3000
3001         char *Announce;
3002
3003         int retry = 0;
3004         char *username_ret = NULL;
3005         struct wbcAuthErrorInfo *error = NULL;
3006         struct pwb_context *ctx = NULL;
3007
3008         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
3009         if (ret) {
3010                 goto out;
3011         }
3012
3013         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
3014
3015         cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
3016
3017         /* clearing offline bit for auth */
3018         ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
3019
3020         /*
3021          * First get the name of a user
3022          */
3023         ret = pam_get_user(pamh, &user, _("Username: "));
3024         if (ret) {
3025                 _pam_log(ctx, LOG_ERR,
3026                          "password - could not identify user");
3027                 goto out;
3028         }
3029
3030         if (user == NULL) {
3031                 _pam_log(ctx, LOG_ERR, "username was NULL!");
3032                 ret = PAM_USER_UNKNOWN;
3033                 goto out;
3034         }
3035
3036         _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
3037
3038         /* check if this is really a user in winbindd, not only in NSS */
3039         ret = valid_user(ctx, user);
3040         switch (ret) {
3041                 case 1:
3042                         ret = PAM_USER_UNKNOWN;
3043                         goto out;
3044                 case -1:
3045                         ret = PAM_SYSTEM_ERR;
3046                         goto out;
3047                 default:
3048                         break;
3049         }
3050
3051         /*
3052          * obtain and verify the current password (OLDAUTHTOK) for
3053          * the user.
3054          */
3055
3056         if (flags & PAM_PRELIM_CHECK) {
3057                 time_t pwdlastset_prelim = 0;
3058
3059                 /* instruct user what is happening */
3060
3061 #define greeting _("Changing password for")
3062                 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
3063                 if (!Announce) {
3064                         _pam_log(ctx, LOG_CRIT,
3065                                  "password - out of memory");
3066                         ret = PAM_BUF_ERR;
3067                         goto out;
3068                 }
3069 #undef greeting
3070
3071                 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
3072                 ret = _winbind_read_password(ctx, lctrl,
3073                                                 Announce,
3074                                                 _("(current) NT password: "),
3075                                                 NULL,
3076                                                 (const char **) &pass_old);
3077                 TALLOC_FREE(Announce);
3078                 if (ret != PAM_SUCCESS) {
3079                         _pam_log(ctx, LOG_NOTICE,
3080                                  "password - (old) token not obtained");
3081                         goto out;
3082                 }
3083
3084                 /* verify that this is the password for this user */
3085
3086                 ret = winbind_auth_request(ctx, user, pass_old,
3087                                            NULL, NULL, 0,
3088                                            &error, NULL, NULL,
3089                                            &pwdlastset_prelim, NULL);
3090
3091                 if (ret != PAM_ACCT_EXPIRED &&
3092                     ret != PAM_AUTHTOK_EXPIRED &&
3093                     ret != PAM_NEW_AUTHTOK_REQD &&
3094                     ret != PAM_SUCCESS) {
3095                         pass_old = NULL;
3096                         goto out;
3097                 }
3098
3099                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3100                              (void *)pwdlastset_prelim, NULL);
3101
3102                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3103                                    (const void *) pass_old);
3104                 pass_old = NULL;
3105                 if (ret != PAM_SUCCESS) {
3106                         _pam_log(ctx, LOG_CRIT,
3107                                  "failed to set PAM_OLDAUTHTOK");
3108                 }
3109         } else if (flags & PAM_UPDATE_AUTHTOK) {
3110
3111                 time_t pwdlastset_update = 0;
3112
3113                 /*
3114                  * obtain the proposed password
3115                  */
3116
3117                 /*
3118                  * get the old token back.
3119                  */
3120
3121                 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
3122
3123                 if (ret != PAM_SUCCESS) {
3124                         _pam_log(ctx, LOG_NOTICE,
3125                                  "user not authenticated");
3126                         goto out;
3127                 }
3128
3129                 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3130
3131                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3132                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3133                 }
3134                 retry = 0;
3135                 ret = PAM_AUTHTOK_ERR;
3136                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3137                         /*
3138                          * use_authtok is to force the use of a previously entered
3139                          * password -- needed for pluggable password strength checking
3140                          */
3141
3142                         ret = _winbind_read_password(ctx, lctrl,
3143                                                      NULL,
3144                                                      _("Enter new NT password: "),
3145                                                      _("Retype new NT password: "),
3146                                                      (const char **)&pass_new);
3147
3148                         if (ret != PAM_SUCCESS) {
3149                                 _pam_log_debug(ctx, LOG_ALERT,
3150                                                "password - "
3151                                                "new password not obtained");
3152                                 pass_old = NULL;/* tidy up */
3153                                 goto out;
3154                         }
3155
3156                         /*
3157                          * At this point we know who the user is and what they
3158                          * propose as their new password. Verify that the new
3159                          * password is acceptable.
3160                          */
3161
3162                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
3163                                 pass_new = NULL;
3164                         }
3165                 }
3166
3167                 /*
3168                  * By reaching here we have approved the passwords and must now
3169                  * rebuild the password database file.
3170                  */
3171                 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3172                               &pwdlastset_update);
3173
3174                 /*
3175                  * if cached creds were enabled, make sure to set the
3176                  * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3177                  * update the cached creds storage - gd
3178                  */
3179                 if (cached_login) {
3180                         ctx->ctrl |= WINBIND_CACHED_LOGIN;
3181                 }
3182
3183                 ret = winbind_chauthtok_request(ctx, user, pass_old,
3184                                                 pass_new, pwdlastset_update);
3185                 if (ret) {
3186                         pass_old = pass_new = NULL;
3187                         goto out;
3188                 }
3189
3190                 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3191
3192                         const char *member = NULL;
3193                         const char *cctype = NULL;
3194                         int warn_pwd_expire;
3195                         struct wbcLogonUserInfo *info = NULL;
3196                         struct wbcUserPasswordPolicyInfo *policy = NULL;
3197
3198                         member = get_member_from_config(ctx);
3199                         cctype = get_krb5_cc_type_from_config(ctx);
3200                         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3201
3202                         /* Keep WINBIND_CACHED_LOGIN bit for
3203                          * authentication after changing the password.
3204                          * This will update the cached credentials in case
3205                          * that winbindd_dual_pam_chauthtok() fails
3206                          * to update them.
3207                          * --- BoYang
3208                          * */
3209
3210                         ret = winbind_auth_request(ctx, user, pass_new,
3211                                                    member, cctype, 0,
3212                                                    &error, &info, &policy,
3213                                                    NULL, &username_ret);
3214                         pass_old = pass_new = NULL;
3215
3216                         if (ret == PAM_SUCCESS) {
3217
3218                                 struct wbcAuthUserInfo *user_info = NULL;
3219
3220                                 if (info && info->info) {
3221                                         user_info = info->info;
3222                                 }
3223
3224                                 /* warn a user if the password is about to
3225                                  * expire soon */
3226                                 _pam_warn_password_expiry(ctx, user_info, policy,
3227                                                           warn_pwd_expire,
3228                                                           NULL, NULL);
3229
3230                                 /* set some info3 info for other modules in the
3231                                  * stack */
3232                                 _pam_set_data_info3(ctx, user_info);
3233
3234                                 /* put krb5ccname into env */
3235                                 _pam_setup_krb5_env(ctx, info);
3236
3237                                 if (username_ret) {
3238                                         pam_set_item(pamh, PAM_USER,
3239                                                      username_ret);
3240                                         _pam_log_debug(ctx, LOG_INFO,
3241                                                        "Returned user was '%s'",
3242                                                        username_ret);
3243                                         free(username_ret);
3244                                 }
3245
3246                         }
3247
3248                         if (info && info->blobs) {
3249                                 wbcFreeMemory(info->blobs);
3250                         }
3251                         wbcFreeMemory(info);
3252                         wbcFreeMemory(policy);
3253
3254                         goto out;
3255                 }
3256         } else {
3257                 ret = PAM_SERVICE_ERR;
3258         }
3259
3260 out:
3261         {
3262                 /* Deal with offline errors. */
3263                 int i;
3264                 const char *codes[] = {
3265                         "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3266                         "NT_STATUS_NO_LOGON_SERVERS",
3267                         "NT_STATUS_ACCESS_DENIED"
3268                 };
3269
3270                 for (i=0; i<ARRAY_SIZE(codes); i++) {
3271                         int _ret;
3272                         if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3273                                 break;
3274                         }
3275                 }
3276         }
3277
3278         wbcFreeMemory(error);
3279
3280         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3281
3282         TALLOC_FREE(ctx);
3283
3284         return ret;
3285 }
3286
3287 #ifdef PAM_STATIC
3288
3289 /* static module data */
3290
3291 struct pam_module _pam_winbind_modstruct = {
3292         MODULE_NAME,
3293         pam_sm_authenticate,
3294         pam_sm_setcred,
3295         pam_sm_acct_mgmt,
3296         pam_sm_open_session,
3297         pam_sm_close_session,
3298         pam_sm_chauthtok
3299 };
3300
3301 #endif
3302
3303 /*
3304  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
3305  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
3306  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3307  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2008
3308  * Copyright (c) Jan Rêkorajski 1999.
3309  * Copyright (c) Andrew G. Morgan 1996-8.
3310  * Copyright (c) Alex O. Yuriev, 1996.
3311  * Copyright (c) Cristian Gafton 1996.
3312  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3313  *
3314  * Redistribution and use in source and binary forms, with or without
3315  * modification, are permitted provided that the following conditions
3316  * are met:
3317  * 1. Redistributions of source code must retain the above copyright
3318  *    notice, and the entire permission notice in its entirety,
3319  *    including the disclaimer of warranties.
3320  * 2. Redistributions in binary form must reproduce the above copyright
3321  *    notice, this list of conditions and the following disclaimer in the
3322  *    documentation and/or other materials provided with the distribution.
3323  * 3. The name of the author may not be used to endorse or promote
3324  *    products derived from this software without specific prior
3325  *    written permission.
3326  *
3327  * ALTERNATIVELY, this product may be distributed under the terms of
3328  * the GNU Public License, in which case the provisions of the GPL are
3329  * required INSTEAD OF the above restrictions.  (This clause is
3330  * necessary due to a potential bad interaction between the GPL and
3331  * the restrictions contained in a BSD-style copyright.)
3332  *
3333  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3334  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3335  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3336  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3337  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3338  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3339  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3340  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3341  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3342  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3343  * OF THE POSSIBILITY OF SUCH DAMAGE.
3344  */