nsswitch/pam_winbind.c

   1 /* pam_winbind module
   2
   3    Copyright Andrew Tridgell <tridge@samba.org> 2000
   4    Copyright Tim Potter <tpot@samba.org> 2000
   5    Copyright Andrew Bartlett <abartlet@samba.org> 2002
   6    Copyright Guenther Deschner <gd@samba.org> 2005-2008
   7
   8    largely based on pam_userdb by Cristian Gafton <gafton@redhat.com> also
   9    contains large slabs of code from pam_unix by Elliot Lee
  10    <sopwith@redhat.com> (see copyright below for full details)
  11 */
  12
  13 #include "pam_winbind.h"
  14
  15 static int wbc_error_to_pam_error(wbcErr status)
  16 {
  17         switch (status) {
  18                 case WBC_ERR_SUCCESS:
  19                         return PAM_SUCCESS;
  20                 case WBC_ERR_NOT_IMPLEMENTED:
  21                         return PAM_SERVICE_ERR;
  22                 case WBC_ERR_UNKNOWN_FAILURE:
  23                         break;
  24                 case WBC_ERR_NO_MEMORY:
  25                         return PAM_BUF_ERR;
  26                 case WBC_ERR_INVALID_SID:
  27                 case WBC_ERR_INVALID_PARAM:
  28                         break;
  29                 case WBC_ERR_WINBIND_NOT_AVAILABLE:
  30                         return PAM_AUTHINFO_UNAVAIL;
  31                 case WBC_ERR_DOMAIN_NOT_FOUND:
  32                         return PAM_AUTHINFO_UNAVAIL;
  33                 case WBC_ERR_INVALID_RESPONSE:
  34                         return PAM_BUF_ERR;
  35                 case WBC_ERR_NSS_ERROR:
  36                         return PAM_USER_UNKNOWN;
  37                 case WBC_ERR_AUTH_ERROR:
  38                         return PAM_AUTH_ERR;
  39                 case WBC_ERR_UNKNOWN_USER:
  40                         return PAM_USER_UNKNOWN;
  41                 case WBC_ERR_UNKNOWN_GROUP:
  42                         return PAM_USER_UNKNOWN;
  43                 case WBC_ERR_PWD_CHANGE_FAILED:
  44                         break;
  45         }
  46
  47         /* be paranoid */
  48         return PAM_AUTH_ERR;
  49 }
  50
  51 static const char *_pam_error_code_str(int err)
  52 {
  53         switch (err) {
  54                 case PAM_SUCCESS:
  55                         return "PAM_SUCCESS";
  56                 case PAM_OPEN_ERR:
  57                         return "PAM_OPEN_ERR";
  58                 case PAM_SYMBOL_ERR:
  59                         return "PAM_SYMBOL_ERR";
  60                 case PAM_SERVICE_ERR:
  61                         return "PAM_SERVICE_ERR";
  62                 case PAM_SYSTEM_ERR:
  63                         return "PAM_SYSTEM_ERR";
  64                 case PAM_BUF_ERR:
  65                         return "PAM_BUF_ERR";
  66                 case PAM_PERM_DENIED:
  67                         return "PAM_PERM_DENIED";
  68                 case PAM_AUTH_ERR:
  69                         return "PAM_AUTH_ERR";
  70                 case PAM_CRED_INSUFFICIENT:
  71                         return "PAM_CRED_INSUFFICIENT";
  72                 case PAM_AUTHINFO_UNAVAIL:
  73                         return "PAM_AUTHINFO_UNAVAIL";
  74                 case PAM_USER_UNKNOWN:
  75                         return "PAM_USER_UNKNOWN";
  76                 case PAM_MAXTRIES:
  77                         return "PAM_MAXTRIES";
  78                 case PAM_NEW_AUTHTOK_REQD:
  79                         return "PAM_NEW_AUTHTOK_REQD";
  80                 case PAM_ACCT_EXPIRED:
  81                         return "PAM_ACCT_EXPIRED";
  82                 case PAM_SESSION_ERR:
  83                         return "PAM_SESSION_ERR";
  84                 case PAM_CRED_UNAVAIL:
  85                         return "PAM_CRED_UNAVAIL";
  86                 case PAM_CRED_EXPIRED:
  87                         return "PAM_CRED_EXPIRED";
  88                 case PAM_CRED_ERR:
  89                         return "PAM_CRED_ERR";
  90                 case PAM_NO_MODULE_DATA:
  91                         return "PAM_NO_MODULE_DATA";
  92                 case PAM_CONV_ERR:
  93                         return "PAM_CONV_ERR";
  94                 case PAM_AUTHTOK_ERR:
  95                         return "PAM_AUTHTOK_ERR";
  96                 case PAM_AUTHTOK_RECOVER_ERR:
  97                         return "PAM_AUTHTOK_RECOVER_ERR";
  98                 case PAM_AUTHTOK_LOCK_BUSY:
  99                         return "PAM_AUTHTOK_LOCK_BUSY";
 100                 case PAM_AUTHTOK_DISABLE_AGING:
 101                         return "PAM_AUTHTOK_DISABLE_AGING";
 102                 case PAM_TRY_AGAIN:
 103                         return "PAM_TRY_AGAIN";
 104                 case PAM_IGNORE:
 105                         return "PAM_IGNORE";
 106                 case PAM_ABORT:
 107                         return "PAM_ABORT";
 108                 case PAM_AUTHTOK_EXPIRED:
 109                         return "PAM_AUTHTOK_EXPIRED";
 110 #ifdef PAM_MODULE_UNKNOWN
 111                 case PAM_MODULE_UNKNOWN:
 112                         return "PAM_MODULE_UNKNOWN";
 113 #endif
 114 #ifdef PAM_BAD_ITEM
 115                 case PAM_BAD_ITEM:
 116                         return "PAM_BAD_ITEM";
 117 #endif
 118 #ifdef PAM_CONV_AGAIN
 119                 case PAM_CONV_AGAIN:
 120                         return "PAM_CONV_AGAIN";
 121 #endif
 122 #ifdef PAM_INCOMPLETE
 123                 case PAM_INCOMPLETE:
 124                         return "PAM_INCOMPLETE";
 125 #endif
 126                 default:
 127                         return NULL;
 128         }
 129 }
 130
 131 #define _PAM_LOG_FUNCTION_ENTER(function, ctx) \
 132         do { \
 133                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] ENTER: " \
 134                                function " (flags: 0x%04x)", ctx->pamh, ctx->flags); \
 135                 _pam_log_state(ctx); \
 136         } while (0)
 137
 138 #define _PAM_LOG_FUNCTION_LEAVE(function, ctx, retval) \
 139         do { \
 140                 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] LEAVE: " \
 141                                function " returning %d (%s)", ctx->pamh, retval, \
 142                                _pam_error_code_str(retval)); \
 143                 _pam_log_state(ctx); \
 144         } while (0)
 145
 146 /* data tokens */
 147
 148 #define MAX_PASSWD_TRIES        3
 149
 150 #ifdef HAVE_GETTEXT
 151 static char initialized = 0;
 152
 153 static inline void textdomain_init(void);
 154 static inline void textdomain_init(void)
 155 {
 156         if (!initialized) {
 157                 bindtextdomain(MODULE_NAME, dyn_LOCALEDIR);
 158                 initialized = 1;
 159         }
 160         return;
 161 }
 162 #endif
 163
 164
 165 /*
 166  * Work around the pam API that has functions with void ** as parameters
 167  * These lead to strict aliasing warnings with gcc.
 168  */
 169 static int _pam_get_item(const pam_handle_t *pamh,
 170                          int item_type,
 171                          const void *_item)
 172 {
 173         const void **item = (const void **)_item;
 174         return pam_get_item(pamh, item_type, item);
 175 }
 176 static int _pam_get_data(const pam_handle_t *pamh,
 177                          const char *module_data_name,
 178                          const void *_data)
 179 {
 180         const void **data = (const void **)_data;
 181         return pam_get_data(pamh, module_data_name, data);
 182 }
 183
 184 /* some syslogging */
 185
 186 #ifdef HAVE_PAM_VSYSLOG
 187 static void _pam_log_int(const pam_handle_t *pamh,
 188                          int err,
 189                          const char *format,
 190                          va_list args)
 191 {
 192         pam_vsyslog(pamh, err, format, args);
 193 }
 194 #else
 195 static void _pam_log_int(const pam_handle_t *pamh,
 196                          int err,
 197                          const char *format,
 198                          va_list args)
 199 {
 200         char *format2 = NULL;
 201         const char *service;
 202
 203         _pam_get_item(pamh, PAM_SERVICE, &service);
 204
 205         format2 = (char *)malloc(strlen(MODULE_NAME)+strlen(format)+strlen(service)+5);
 206         if (format2 == NULL) {
 207                 /* what else todo ? */
 208                 vsyslog(err, format, args);
 209                 return;
 210         }
 211
 212         sprintf(format2, "%s(%s): %s", MODULE_NAME, service, format);
 213         vsyslog(err, format2, args);
 214         SAFE_FREE(format2);
 215 }
 216 #endif /* HAVE_PAM_VSYSLOG */
 217
 218 static bool _pam_log_is_silent(int ctrl)
 219 {
 220         return on(ctrl, WINBIND_SILENT);
 221 }
 222
 223 static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 224 static void _pam_log(struct pwb_context *r, int err, const char *format, ...)
 225 {
 226         va_list args;
 227
 228         if (_pam_log_is_silent(r->ctrl)) {
 229                 return;
 230         }
 231
 232         va_start(args, format);
 233         _pam_log_int(r->pamh, err, format, args);
 234         va_end(args);
 235 }
 236 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 237 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 238 {
 239         va_list args;
 240
 241         if (_pam_log_is_silent(ctrl)) {
 242                 return;
 243         }
 244
 245         va_start(args, format);
 246         _pam_log_int(pamh, err, format, args);
 247         va_end(args);
 248 }
 249
 250 static bool _pam_log_is_debug_enabled(int ctrl)
 251 {
 252         if (ctrl == -1) {
 253                 return false;
 254         }
 255
 256         if (_pam_log_is_silent(ctrl)) {
 257                 return false;
 258         }
 259
 260         if (!(ctrl & WINBIND_DEBUG_ARG)) {
 261                 return false;
 262         }
 263
 264         return true;
 265 }
 266
 267 static bool _pam_log_is_debug_state_enabled(int ctrl)
 268 {
 269         if (!(ctrl & WINBIND_DEBUG_STATE)) {
 270                 return false;
 271         }
 272
 273         return _pam_log_is_debug_enabled(ctrl);
 274 }
 275
 276 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 277 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...)
 278 {
 279         va_list args;
 280
 281         if (!_pam_log_is_debug_enabled(r->ctrl)) {
 282                 return;
 283         }
 284
 285         va_start(args, format);
 286         _pam_log_int(r->pamh, err, format, args);
 287         va_end(args);
 288 }
 289 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
 290 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
 291 {
 292         va_list args;
 293
 294         if (!_pam_log_is_debug_enabled(ctrl)) {
 295                 return;
 296         }
 297
 298         va_start(args, format);
 299         _pam_log_int(pamh, err, format, args);
 300         va_end(args);
 301 }
 302
 303 static void _pam_log_state_datum(struct pwb_context *ctx,
 304                                  int item_type,
 305                                  const char *key,
 306                                  int is_string)
 307 {
 308         const void *data = NULL;
 309         if (item_type != 0) {
 310                 pam_get_item(ctx->pamh, item_type, &data);
 311         } else {
 312                 pam_get_data(ctx->pamh, key, &data);
 313         }
 314         if (data != NULL) {
 315                 const char *type = (item_type != 0) ? "ITEM" : "DATA";
 316                 if (is_string != 0) {
 317                         _pam_log_debug(ctx, LOG_DEBUG,
 318                                        "[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
 319                                        ctx->pamh, type, key, (const char *)data,
 320                                        data);
 321                 } else {
 322                         _pam_log_debug(ctx, LOG_DEBUG,
 323                                        "[pamh: %p] STATE: %s(%s) = %p",
 324                                        ctx->pamh, type, key, data);
 325                 }
 326         }
 327 }
 328
 329 #define _PAM_LOG_STATE_DATA_POINTER(ctx, module_data_name) \
 330         _pam_log_state_datum(ctx, 0, module_data_name, 0)
 331
 332 #define _PAM_LOG_STATE_DATA_STRING(ctx, module_data_name) \
 333         _pam_log_state_datum(ctx, 0, module_data_name, 1)
 334
 335 #define _PAM_LOG_STATE_ITEM_POINTER(ctx, item_type) \
 336         _pam_log_state_datum(ctx, item_type, #item_type, 0)
 337
 338 #define _PAM_LOG_STATE_ITEM_STRING(ctx, item_type) \
 339         _pam_log_state_datum(ctx, item_type, #item_type, 1)
 340
 341 #ifdef DEBUG_PASSWORD
 342 #define _LOG_PASSWORD_AS_STRING 1
 343 #else
 344 #define _LOG_PASSWORD_AS_STRING 0
 345 #endif
 346
 347 #define _PAM_LOG_STATE_ITEM_PASSWORD(ctx, item_type) \
 348         _pam_log_state_datum(ctx, item_type, #item_type, \
 349                              _LOG_PASSWORD_AS_STRING)
 350
 351 static void _pam_log_state(struct pwb_context *ctx)
 352 {
 353         if (!_pam_log_is_debug_state_enabled(ctx->ctrl)) {
 354                 return;
 355         }
 356
 357         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
 358         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
 359         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
 360         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
 361         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
 362         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
 363         _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
 364         _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
 365         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
 366 #ifdef PAM_FAIL_DELAY
 367         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
 368 #endif
 369 #ifdef PAM_REPOSITORY
 370         _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
 371 #endif
 372
 373         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
 374         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
 375         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
 376         _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
 377         _PAM_LOG_STATE_DATA_STRING(ctx,
 378                                    PAM_WINBIND_NEW_AUTHTOK_REQD);
 379                                    /* Use atoi to get PAM result code */
 380         _PAM_LOG_STATE_DATA_STRING(ctx,
 381                                    PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
 382         _PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
 383 }
 384
 385 static int _pam_parse(const pam_handle_t *pamh,
 386                       int flags,
 387                       int argc,
 388                       const char **argv,
 389                       dictionary **result_d)
 390 {
 391         int ctrl = 0;
 392         const char *config_file = NULL;
 393         int i;
 394         const char **v;
 395         dictionary *d = NULL;
 396
 397         if (flags & PAM_SILENT) {
 398                 ctrl |= WINBIND_SILENT;
 399         }
 400
 401         for (i=argc,v=argv; i-- > 0; ++v) {
 402                 if (!strncasecmp(*v, "config", strlen("config"))) {
 403                         ctrl |= WINBIND_CONFIG_FILE;
 404                         config_file = v[i];
 405                         break;
 406                 }
 407         }
 408
 409         if (config_file == NULL) {
 410                 config_file = PAM_WINBIND_CONFIG_FILE;
 411         }
 412
 413         d = iniparser_load(config_file);
 414         if (d == NULL) {
 415                 goto config_from_pam;
 416         }
 417
 418         if (iniparser_getboolean(d, "global:debug", false)) {
 419                 ctrl |= WINBIND_DEBUG_ARG;
 420         }
 421
 422         if (iniparser_getboolean(d, "global:debug_state", false)) {
 423                 ctrl |= WINBIND_DEBUG_STATE;
 424         }
 425
 426         if (iniparser_getboolean(d, "global:cached_login", false)) {
 427                 ctrl |= WINBIND_CACHED_LOGIN;
 428         }
 429
 430         if (iniparser_getboolean(d, "global:krb5_auth", false)) {
 431                 ctrl |= WINBIND_KRB5_AUTH;
 432         }
 433
 434         if (iniparser_getboolean(d, "global:silent", false)) {
 435                 ctrl |= WINBIND_SILENT;
 436         }
 437
 438         if (iniparser_getstr(d, "global:krb5_ccache_type") != NULL) {
 439                 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 440         }
 441
 442         if ((iniparser_getstr(d, "global:require-membership-of") != NULL) ||
 443             (iniparser_getstr(d, "global:require_membership_of") != NULL)) {
 444                 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 445         }
 446
 447         if (iniparser_getboolean(d, "global:try_first_pass", false)) {
 448                 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 449         }
 450
 451         if (iniparser_getint(d, "global:warn_pwd_expire", 0)) {
 452                 ctrl |= WINBIND_WARN_PWD_EXPIRE;
 453         }
 454
 455         if (iniparser_getboolean(d, "global:mkhomedir", false)) {
 456                 ctrl |= WINBIND_MKHOMEDIR;
 457         }
 458
 459 config_from_pam:
 460         /* step through arguments */
 461         for (i=argc,v=argv; i-- > 0; ++v) {
 462
 463                 /* generic options */
 464                 if (!strcmp(*v,"debug"))
 465                         ctrl |= WINBIND_DEBUG_ARG;
 466                 else if (!strcasecmp(*v, "debug_state"))
 467                         ctrl |= WINBIND_DEBUG_STATE;
 468                 else if (!strcasecmp(*v, "silent"))
 469                         ctrl |= WINBIND_SILENT;
 470                 else if (!strcasecmp(*v, "use_authtok"))
 471                         ctrl |= WINBIND_USE_AUTHTOK_ARG;
 472                 else if (!strcasecmp(*v, "use_first_pass"))
 473                         ctrl |= WINBIND_USE_FIRST_PASS_ARG;
 474                 else if (!strcasecmp(*v, "try_first_pass"))
 475                         ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
 476                 else if (!strcasecmp(*v, "unknown_ok"))
 477                         ctrl |= WINBIND_UNKNOWN_OK_ARG;
 478                 else if (!strncasecmp(*v, "require_membership_of",
 479                                       strlen("require_membership_of")))
 480                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 481                 else if (!strncasecmp(*v, "require-membership-of",
 482                                       strlen("require-membership-of")))
 483                         ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
 484                 else if (!strcasecmp(*v, "krb5_auth"))
 485                         ctrl |= WINBIND_KRB5_AUTH;
 486                 else if (!strncasecmp(*v, "krb5_ccache_type",
 487                                       strlen("krb5_ccache_type")))
 488                         ctrl |= WINBIND_KRB5_CCACHE_TYPE;
 489                 else if (!strcasecmp(*v, "cached_login"))
 490                         ctrl |= WINBIND_CACHED_LOGIN;
 491                 else if (!strcasecmp(*v, "mkhomedir"))
 492                         ctrl |= WINBIND_MKHOMEDIR;
 493                 else {
 494                         __pam_log(pamh, ctrl, LOG_ERR,
 495                                  "pam_parse: unknown option: %s", *v);
 496                         return -1;
 497                 }
 498
 499         }
 500
 501         if (result_d) {
 502                 *result_d = d;
 503         } else {
 504                 if (d) {
 505                         iniparser_freedict(d);
 506                 }
 507         }
 508
 509         return ctrl;
 510 };
 511
 512 static int _pam_winbind_free_context(struct pwb_context *ctx)
 513 {
 514         if (!ctx) {
 515                 return 0;
 516         }
 517
 518         if (ctx->dict) {
 519                 iniparser_freedict(ctx->dict);
 520         }
 521
 522         return 0;
 523 }
 524
 525 static int _pam_winbind_init_context(pam_handle_t *pamh,
 526                                      int flags,
 527                                      int argc,
 528                                      const char **argv,
 529                                      struct pwb_context **ctx_p)
 530 {
 531         struct pwb_context *r = NULL;
 532
 533 #ifdef HAVE_GETTEXT
 534         textdomain_init();
 535 #endif
 536
 537         r = TALLOC_ZERO_P(NULL, struct pwb_context);
 538         if (!r) {
 539                 return PAM_BUF_ERR;
 540         }
 541
 542         talloc_set_destructor(r, _pam_winbind_free_context);
 543
 544         r->pamh = pamh;
 545         r->flags = flags;
 546         r->argc = argc;
 547         r->argv = argv;
 548         r->ctrl = _pam_parse(pamh, flags, argc, argv, &r->dict);
 549         if (r->ctrl == -1) {
 550                 TALLOC_FREE(r);
 551                 return PAM_SYSTEM_ERR;
 552         }
 553
 554         *ctx_p = r;
 555
 556         return PAM_SUCCESS;
 557 }
 558
 559 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
 560                                       void *data,
 561                                       int error_status)
 562 {
 563         int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
 564         if (_pam_log_is_debug_state_enabled(ctrl)) {
 565                 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
 566                                "[pamh: %p] CLEAN: cleaning up PAM data %p "
 567                                "(error_status = %d)", pamh, data,
 568                                error_status);
 569         }
 570         TALLOC_FREE(data);
 571 }
 572
 573
 574 static const struct ntstatus_errors {
 575         const char *ntstatus_string;
 576         const char *error_string;
 577 } ntstatus_errors[] = {
 578         {"NT_STATUS_OK",
 579                 N_("Success")},
 580         {"NT_STATUS_BACKUP_CONTROLLER",
 581                 N_("No primary Domain Controler available")},
 582         {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
 583                 N_("No domain controllers found")},
 584         {"NT_STATUS_NO_LOGON_SERVERS",
 585                 N_("No logon servers")},
 586         {"NT_STATUS_PWD_TOO_SHORT",
 587                 N_("Password too short")},
 588         {"NT_STATUS_PWD_TOO_RECENT",
 589                 N_("The password of this user is too recent to change")},
 590         {"NT_STATUS_PWD_HISTORY_CONFLICT",
 591                 N_("Password is already in password history")},
 592         {"NT_STATUS_PASSWORD_EXPIRED",
 593                 N_("Your password has expired")},
 594         {"NT_STATUS_PASSWORD_MUST_CHANGE",
 595                 N_("You need to change your password now")},
 596         {"NT_STATUS_INVALID_WORKSTATION",
 597                 N_("You are not allowed to logon from this workstation")},
 598         {"NT_STATUS_INVALID_LOGON_HOURS",
 599                 N_("You are not allowed to logon at this time")},
 600         {"NT_STATUS_ACCOUNT_EXPIRED",
 601                 N_("Your account has expired. "
 602                    "Please contact your System administrator")}, /* SCNR */
 603         {"NT_STATUS_ACCOUNT_DISABLED",
 604                 N_("Your account is disabled. "
 605                    "Please contact your System administrator")}, /* SCNR */
 606         {"NT_STATUS_ACCOUNT_LOCKED_OUT",
 607                 N_("Your account has been locked. "
 608                    "Please contact your System administrator")}, /* SCNR */
 609         {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
 610                 N_("Invalid Trust Account")},
 611         {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
 612                 N_("Invalid Trust Account")},
 613         {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
 614                 N_("Invalid Trust Account")},
 615         {"NT_STATUS_ACCESS_DENIED",
 616                 N_("Access is denied")},
 617         {NULL, NULL}
 618 };
 619
 620 static const char *_get_ntstatus_error_string(const char *nt_status_string)
 621 {
 622         int i;
 623         for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
 624                 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
 625                                 nt_status_string)) {
 626                         return _(ntstatus_errors[i].error_string);
 627                 }
 628         }
 629         return NULL;
 630 }
 631
 632 /* --- authentication management functions --- */
 633
 634 /* Attempt a conversation */
 635
 636 static int converse(const pam_handle_t *pamh,
 637                     int nargs,
 638                     struct pam_message **message,
 639                     struct pam_response **response)
 640 {
 641         int retval;
 642         struct pam_conv *conv;
 643
 644         retval = _pam_get_item(pamh, PAM_CONV, &conv);
 645         if (retval == PAM_SUCCESS) {
 646                 retval = conv->conv(nargs,
 647                                     (const struct pam_message **)message,
 648                                     response, conv->appdata_ptr);
 649         }
 650
 651         return retval; /* propagate error status */
 652 }
 653
 654
 655 static int _make_remark(struct pwb_context *ctx,
 656                         int type,
 657                         const char *text)
 658 {
 659         int retval = PAM_SUCCESS;
 660
 661         struct pam_message *pmsg[1], msg[1];
 662         struct pam_response *resp;
 663
 664         if (ctx->flags & WINBIND_SILENT) {
 665                 return PAM_SUCCESS;
 666         }
 667
 668         pmsg[0] = &msg[0];
 669         msg[0].msg = discard_const_p(char, text);
 670         msg[0].msg_style = type;
 671
 672         resp = NULL;
 673         retval = converse(ctx->pamh, 1, pmsg, &resp);
 674
 675         if (resp) {
 676                 _pam_drop_reply(resp, 1);
 677         }
 678         return retval;
 679 }
 680
 681 static int _make_remark_v(struct pwb_context *ctx,
 682                           int type,
 683                           const char *format,
 684                           va_list args)
 685 {
 686         char *var;
 687         int ret;
 688
 689         ret = vasprintf(&var, format, args);
 690         if (ret < 0) {
 691                 _pam_log(ctx, LOG_ERR, "memory allocation failure");
 692                 return ret;
 693         }
 694
 695         ret = _make_remark(ctx, type, var);
 696         SAFE_FREE(var);
 697         return ret;
 698 }
 699
 700 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
 701 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
 702 {
 703         int ret;
 704         va_list args;
 705
 706         va_start(args, format);
 707         ret = _make_remark_v(ctx, type, format, args);
 708         va_end(args);
 709         return ret;
 710 }
 711
 712 static int pam_winbind_request_log(struct pwb_context *ctx,
 713                                    int retval,
 714                                    const char *user,
 715                                    const char *fn)
 716 {
 717         switch (retval) {
 718         case PAM_AUTH_ERR:
 719                 /* incorrect password */
 720                 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
 721                          "(incorrect password or invalid membership)", user);
 722                 return retval;
 723         case PAM_ACCT_EXPIRED:
 724                 /* account expired */
 725                 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
 726                          user);
 727                 return retval;
 728         case PAM_AUTHTOK_EXPIRED:
 729                 /* password expired */
 730                 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
 731                          user);
 732                 return retval;
 733         case PAM_NEW_AUTHTOK_REQD:
 734                 /* new password required */
 735                 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
 736                          "required", user);
 737                 return retval;
 738         case PAM_USER_UNKNOWN:
 739                 /* the user does not exist */
 740                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
 741                                user);
 742                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
 743                         return PAM_IGNORE;
 744                 }
 745                 return retval;
 746         case PAM_SUCCESS:
 747                 /* Otherwise, the authentication looked good */
 748                 if (strcmp(fn, "wbcLogonUser") == 0) {
 749                         _pam_log(ctx, LOG_NOTICE,
 750                                  "user '%s' granted access", user);
 751                 } else {
 752                         _pam_log(ctx, LOG_NOTICE,
 753                                  "user '%s' OK", user);
 754                 }
 755                 return retval;
 756         default:
 757                 /* we don't know anything about this return value */
 758                 _pam_log(ctx, LOG_ERR,
 759                          "internal module error (retval = %s(%d), user = '%s')",
 760                         _pam_error_code_str(retval), retval, user);
 761                 return retval;
 762         }
 763 }
 764
 765 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
 766                                        struct wbcAuthErrorInfo *e,
 767                                        wbcErr status,
 768                                        const char *username,
 769                                        const char *fn)
 770 {
 771         int ret = PAM_AUTH_ERR;
 772
 773         if (WBC_ERROR_IS_OK(status)) {
 774                 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
 775                         fn);
 776                 ret = PAM_SUCCESS;
 777                 return pam_winbind_request_log(ctx, ret, username, fn);
 778         }
 779
 780         if (e) {
 781                 if (e->pam_error != PAM_SUCCESS) {
 782                         _pam_log(ctx, LOG_ERR,
 783                                  "request %s failed: %s, "
 784                                  "PAM error: %s (%d), NTSTATUS: %s, "
 785                                  "Error message was: %s",
 786                                  fn,
 787                                  wbcErrorString(status),
 788                                  _pam_error_code_str(e->pam_error),
 789                                  e->pam_error,
 790                                  e->nt_string,
 791                                  e->display_string);
 792                         ret = e->pam_error;
 793                         return pam_winbind_request_log(ctx, ret, username, fn);
 794                 }
 795
 796                 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
 797
 798                 ret = PAM_SERVICE_ERR;
 799                 return pam_winbind_request_log(ctx, ret, username, fn);
 800         }
 801
 802         ret = wbc_error_to_pam_error(status);
 803         return pam_winbind_request_log(ctx, ret, username, fn);
 804 }
 805
 806
 807 /**
 808  * send a password expiry message if required
 809  *
 810  * @param ctx PAM winbind context.
 811  * @param next_change expected (calculated) next expiry date.
 812  * @param already_expired pointer to a boolean to indicate if the password is
 813  *        already expired.
 814  *
 815  * @return boolean Returns true if message has been sent, false if not.
 816  */
 817
 818 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
 819                                               time_t next_change,
 820                                               time_t now,
 821                                               int warn_pwd_expire,
 822                                               bool *already_expired)
 823 {
 824         int days = 0;
 825         struct tm tm_now, tm_next_change;
 826
 827         if (already_expired) {
 828                 *already_expired = false;
 829         }
 830
 831         if (next_change <= now) {
 832                 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
 833                 if (already_expired) {
 834                         *already_expired = true;
 835                 }
 836                 return true;
 837         }
 838
 839         if ((next_change < 0) ||
 840             (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
 841                 return false;
 842         }
 843
 844         if ((localtime_r(&now, &tm_now) == NULL) ||
 845             (localtime_r(&next_change, &tm_next_change) == NULL)) {
 846                 return false;
 847         }
 848
 849         days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
 850                (tm_now.tm_yday+tm_now.tm_year*365);
 851
 852         if (days == 0) {
 853                 _make_remark(ctx, PAM_TEXT_INFO,
 854                              _("Your password expires today"));
 855                 return true;
 856         }
 857
 858         if (days > 0 && days < warn_pwd_expire) {
 859                 _make_remark_format(ctx, PAM_TEXT_INFO,
 860                                     _("Your password will expire in %d %s"),
 861                                     days, (days > 1) ? _("days"):_("day"));
 862                 return true;
 863         }
 864
 865         return false;
 866 }
 867
 868 /**
 869  * Send a warning if the password expires in the near future
 870  *
 871  * @param ctx PAM winbind context.
 872  * @param response The full authentication response structure.
 873  * @param already_expired boolean, is the pwd already expired?
 874  *
 875  * @return void.
 876  */
 877
 878 static void _pam_warn_password_expiry(struct pwb_context *ctx,
 879                                       const struct wbcAuthUserInfo *info,
 880                                       const struct wbcUserPasswordPolicyInfo *policy,
 881                                       int warn_pwd_expire,
 882                                       bool *already_expired)
 883 {
 884         time_t now = time(NULL);
 885         time_t next_change = 0;
 886
 887         if (!info || !policy) {
 888                 return;
 889         }
 890
 891         if (already_expired) {
 892                 *already_expired = false;
 893         }
 894
 895         /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
 896         if (info->acct_flags & WBC_ACB_PWNOEXP) {
 897                 return;
 898         }
 899
 900         /* no point in sending a warning if this is a grace logon */
 901         if (PAM_WB_GRACE_LOGON(info->user_flags)) {
 902                 return;
 903         }
 904
 905         /* check if the info3 must change timestamp has been set */
 906         next_change = info->pass_must_change_time;
 907
 908         if (_pam_send_password_expiry_message(ctx, next_change, now,
 909                                               warn_pwd_expire,
 910                                               already_expired)) {
 911                 return;
 912         }
 913
 914         /* now check for the global password policy */
 915         /* good catch from Ralf Haferkamp: an expiry of "never" is translated
 916          * to -1 */
 917         if ((policy->expire == (int64_t)-1) ||
 918             (policy->expire == 0)) {
 919                 return;
 920         }
 921
 922         next_change = info->pass_last_set_time + policy->expire;
 923
 924         if (_pam_send_password_expiry_message(ctx, next_change, now,
 925                                               warn_pwd_expire,
 926                                               already_expired)) {
 927                 return;
 928         }
 929
 930         /* no warning sent */
 931 }
 932
 933 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
 934
 935 /**
 936  * Append a string, making sure not to overflow and to always return a
 937  * NULL-terminated string.
 938  *
 939  * @param dest Destination string buffer (must already be NULL-terminated).
 940  * @param src Source string buffer.
 941  * @param dest_buffer_size Size of dest buffer in bytes.
 942  *
 943  * @return false if dest buffer is not big enough (no bytes copied), true on
 944  * success.
 945  */
 946
 947 static bool safe_append_string(char *dest,
 948                                const char *src,
 949                                int dest_buffer_size)
 950 {
 951         int dest_length = strlen(dest);
 952         int src_length = strlen(src);
 953
 954         if (dest_length + src_length + 1 > dest_buffer_size) {
 955                 return false;
 956         }
 957
 958         memcpy(dest + dest_length, src, src_length + 1);
 959         return true;
 960 }
 961
 962 /**
 963  * Convert a names into a SID string, appending it to a buffer.
 964  *
 965  * @param ctx PAM winbind context.
 966  * @param user User in PAM request.
 967  * @param name Name to convert.
 968  * @param sid_list_buffer Where to append the string sid.
 969  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
 970  *
 971  * @return false on failure, true on success.
 972  */
 973 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
 974                                        const char *user,
 975                                        const char *name,
 976                                        char *sid_list_buffer,
 977                                        int sid_list_buffer_size)
 978 {
 979         const char* sid_string = NULL;
 980         char *sid_str = NULL;
 981
 982         /* lookup name? */
 983         if (IS_SID_STRING(name)) {
 984                 sid_string = name;
 985         } else {
 986                 wbcErr wbc_status;
 987                 struct wbcDomainSid sid;
 988                 enum wbcSidType type;
 989
 990                 _pam_log_debug(ctx, LOG_DEBUG,
 991                                "no sid given, looking up: %s\n", name);
 992
 993                 wbc_status = wbcLookupName("", name, &sid, &type);
 994                 if (!WBC_ERROR_IS_OK(wbc_status)) {
 995                         _pam_log(ctx, LOG_INFO,
 996                                  "could not lookup name: %s\n", name);
 997                         return false;
 998                 }
 999
1000                 wbc_status = wbcSidToString(&sid, &sid_str);
1001                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1002                         return false;
1003                 }
1004
1005                 sid_string = sid_str;
1006         }
1007
1008         if (!safe_append_string(sid_list_buffer, sid_string,
1009                                 sid_list_buffer_size)) {
1010                 wbcFreeMemory(sid_str);
1011                 return false;
1012         }
1013
1014         wbcFreeMemory(sid_str);
1015         return true;
1016 }
1017
1018 /**
1019  * Convert a list of names into a list of sids.
1020  *
1021  * @param ctx PAM winbind context.
1022  * @param user User in PAM request.
1023  * @param name_list List of names or string sids, separated by commas.
1024  * @param sid_list_buffer Where to put the list of string sids.
1025  * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1026  *
1027  * @return false on failure, true on success.
1028  */
1029 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1030                                                  const char *user,
1031                                                  const char *name_list,
1032                                                  char *sid_list_buffer,
1033                                                  int sid_list_buffer_size)
1034 {
1035         bool result = false;
1036         char *current_name = NULL;
1037         const char *search_location;
1038         const char *comma;
1039         int len;
1040
1041         if (sid_list_buffer_size > 0) {
1042                 sid_list_buffer[0] = 0;
1043         }
1044
1045         search_location = name_list;
1046         while ((comma = strstr(search_location, ",")) != NULL) {
1047                 current_name = strndup(search_location,
1048                                        comma - search_location);
1049                 if (NULL == current_name) {
1050                         goto out;
1051                 }
1052
1053                 if (!winbind_name_to_sid_string(ctx, user,
1054                                                 current_name,
1055                                                 sid_list_buffer,
1056                                                 sid_list_buffer_size)) {
1057                         /*
1058                          * If one group name failed, we must not fail
1059                          * the authentication totally, continue with
1060                          * the following group names. If user belongs to
1061                          * one of the valid groups, we must allow it
1062                          * login. -- BoYang
1063                          */
1064
1065                         _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1066                                  "check if group %s is valid group.", current_name,
1067                                  current_name);
1068                         _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1069                                         "to sid, please contact your administrator to see "
1070                                         "if group %s is valid."), current_name, current_name);
1071                         SAFE_FREE(current_name);
1072                         search_location = comma + 1;
1073                         continue;
1074                 }
1075
1076                 SAFE_FREE(current_name);
1077
1078                 if (!safe_append_string(sid_list_buffer, ",",
1079                                         sid_list_buffer_size)) {
1080                         goto out;
1081                 }
1082
1083                 search_location = comma + 1;
1084         }
1085
1086         if (!winbind_name_to_sid_string(ctx, user, search_location,
1087                                         sid_list_buffer,
1088                                         sid_list_buffer_size)) {
1089                 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1090                          "check if group %s is valid group.", search_location,
1091                          search_location);
1092                 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1093                                 "to sid, please contact your administrator to see "
1094                                 "if group %s is valid."), search_location, search_location);
1095                 /*
1096                  * The lookup of the last name failed..
1097                  * It results in require_member_of_sid ends with ','
1098                  * It is malformated parameter here, overwrite the last ','.
1099                  */
1100                 len = strlen(sid_list_buffer);
1101                 if (len) {
1102                         if (sid_list_buffer[len - 1] == ',') {
1103                                 sid_list_buffer[len - 1] = '\0';
1104                         }
1105                 }
1106         }
1107
1108         result = true;
1109
1110 out:
1111         SAFE_FREE(current_name);
1112         return result;
1113 }
1114
1115 /**
1116  * put krb5ccname variable into environment
1117  *
1118  * @param ctx PAM winbind context.
1119  * @param krb5ccname env variable retrieved from winbindd.
1120  *
1121  * @return void.
1122  */
1123
1124 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1125                                 struct wbcLogonUserInfo *info)
1126 {
1127         char var[PATH_MAX];
1128         int ret;
1129         uint32_t i;
1130         const char *krb5ccname = NULL;
1131
1132         if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1133                 return;
1134         }
1135
1136         if (!info) {
1137                 return;
1138         }
1139
1140         for (i=0; i < info->num_blobs; i++) {
1141                 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1142                         krb5ccname = (const char *)info->blobs[i].blob.data;
1143                         break;
1144                 }
1145         }
1146
1147         if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1148                 return;
1149         }
1150
1151         _pam_log_debug(ctx, LOG_DEBUG,
1152                        "request returned KRB5CCNAME: %s", krb5ccname);
1153
1154         if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
1155                 return;
1156         }
1157
1158         ret = pam_putenv(ctx->pamh, var);
1159         if (ret) {
1160                 _pam_log(ctx, LOG_ERR,
1161                          "failed to set KRB5CCNAME to %s: %s",
1162                          var, pam_strerror(ctx->pamh, ret));
1163         }
1164 }
1165
1166 /**
1167  * Copy unix username if available (further processed in PAM).
1168  *
1169  * @param ctx PAM winbind context
1170  * @param user_ret A pointer that holds a pointer to a string
1171  * @param unix_username A username
1172  *
1173  * @return void.
1174  */
1175
1176 static void _pam_setup_unix_username(struct pwb_context *ctx,
1177                                      char **user_ret,
1178                                      struct wbcLogonUserInfo *info)
1179 {
1180         const char *unix_username = NULL;
1181         uint32_t i;
1182
1183         if (!user_ret || !info) {
1184                 return;
1185         }
1186
1187         for (i=0; i < info->num_blobs; i++) {
1188                 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1189                         unix_username = (const char *)info->blobs[i].blob.data;
1190                         break;
1191                 }
1192         }
1193
1194         if (!unix_username || !unix_username[0]) {
1195                 return;
1196         }
1197
1198         *user_ret = strdup(unix_username);
1199 }
1200
1201 /**
1202  * Set string into the PAM stack.
1203  *
1204  * @param ctx PAM winbind context.
1205  * @param data_name Key name for pam_set_data.
1206  * @param value String value.
1207  *
1208  * @return void.
1209  */
1210
1211 static void _pam_set_data_string(struct pwb_context *ctx,
1212                                  const char *data_name,
1213                                  const char *value)
1214 {
1215         int ret;
1216
1217         if (!data_name || !value || (strlen(data_name) == 0) ||
1218              (strlen(value) == 0)) {
1219                 return;
1220         }
1221
1222         ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1223                            _pam_winbind_cleanup_func);
1224         if (ret) {
1225                 _pam_log_debug(ctx, LOG_DEBUG,
1226                                "Could not set data %s: %s\n",
1227                                data_name, pam_strerror(ctx->pamh, ret));
1228         }
1229 }
1230
1231 /**
1232  * Set info3 strings into the PAM stack.
1233  *
1234  * @param ctx PAM winbind context.
1235  * @param data_name Key name for pam_set_data.
1236  * @param value String value.
1237  *
1238  * @return void.
1239  */
1240
1241 static void _pam_set_data_info3(struct pwb_context *ctx,
1242                                 const struct wbcAuthUserInfo *info)
1243 {
1244         _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1245                              info->home_directory);
1246         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1247                              info->logon_script);
1248         _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1249                              info->logon_server);
1250         _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1251                              info->profile_path);
1252 }
1253
1254 /**
1255  * Free info3 strings in the PAM stack.
1256  *
1257  * @param pamh PAM handle
1258  *
1259  * @return void.
1260  */
1261
1262 static void _pam_free_data_info3(pam_handle_t *pamh)
1263 {
1264         pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1265         pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1266         pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1267         pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1268 }
1269
1270 /**
1271  * Send PAM_ERROR_MSG for cached or grace logons.
1272  *
1273  * @param ctx PAM winbind context.
1274  * @param username User in PAM request.
1275  * @param info3_user_flgs Info3 flags containing logon type bits.
1276  *
1277  * @return void.
1278  */
1279
1280 static void _pam_warn_logon_type(struct pwb_context *ctx,
1281                                  const char *username,
1282                                  uint32_t info3_user_flgs)
1283 {
1284         /* inform about logon type */
1285         if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1286
1287                 _make_remark(ctx, PAM_ERROR_MSG,
1288                              _("Grace login. "
1289                                "Please change your password as soon you're "
1290                                "online again"));
1291                 _pam_log_debug(ctx, LOG_DEBUG,
1292                                "User %s logged on using grace logon\n",
1293                                username);
1294
1295         } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1296
1297                 _make_remark(ctx, PAM_ERROR_MSG,
1298                              _("Domain Controller unreachable, "
1299                                "using cached credentials instead. "
1300                                "Network resources may be unavailable"));
1301                 _pam_log_debug(ctx, LOG_DEBUG,
1302                                "User %s logged on using cached credentials\n",
1303                                username);
1304         }
1305 }
1306
1307 /**
1308  * Send PAM_ERROR_MSG for krb5 errors.
1309  *
1310  * @param ctx PAM winbind context.
1311  * @param username User in PAM request.
1312  * @param info3_user_flgs Info3 flags containing logon type bits.
1313  *
1314  * @return void.
1315  */
1316
1317 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1318                                    const char *username,
1319                                    uint32_t info3_user_flgs)
1320 {
1321         if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1322                 _make_remark(ctx, PAM_ERROR_MSG,
1323                              _("Failed to establish your Kerberos Ticket cache "
1324                                "due time differences\n"
1325                                "with the domain controller.  "
1326                                "Please verify the system time.\n"));
1327                 _pam_log_debug(ctx, LOG_DEBUG,
1328                                "User %s: Clock skew when getting Krb5 TGT\n",
1329                                username);
1330         }
1331 }
1332
1333 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1334                                        const struct wbcAuthErrorInfo *e,
1335                                        const char *nt_status_string,
1336                                        int *pam_error)
1337 {
1338         const char *ntstatus = NULL;
1339         const char *error_string = NULL;
1340
1341         if (!e || !pam_error) {
1342                 return false;
1343         }
1344
1345         ntstatus = e->nt_string;
1346         if (!ntstatus) {
1347                 return false;
1348         }
1349
1350         if (strcasecmp(ntstatus, nt_status_string) == 0) {
1351
1352                 error_string = _get_ntstatus_error_string(nt_status_string);
1353                 if (error_string) {
1354                         _make_remark(ctx, PAM_ERROR_MSG, error_string);
1355                         *pam_error = e->pam_error;
1356                         return true;
1357                 }
1358
1359                 if (e->display_string) {
1360                         _make_remark(ctx, PAM_ERROR_MSG, e->display_string);
1361                         *pam_error = e->pam_error;
1362                         return true;
1363                 }
1364
1365                 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1366                 *pam_error = e->pam_error;
1367
1368                 return true;
1369         }
1370
1371         return false;
1372 };
1373
1374 /**
1375  * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1376  *
1377  * @param i The wbcUserPasswordPolicyInfo struct.
1378  *
1379  * @return string (caller needs to talloc_free).
1380  */
1381
1382 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1383                                                  struct wbcUserPasswordPolicyInfo *i)
1384 {
1385         char *str = NULL;
1386
1387         if (!i) {
1388                 goto failed;
1389         }
1390
1391         str = talloc_asprintf(ctx, _("Your password "));
1392         if (!str) {
1393                 goto failed;
1394         }
1395
1396         if (i->min_length_password > 0) {
1397                 str = talloc_asprintf_append(str,
1398                                _("must be at least %d characters; "),
1399                                i->min_length_password);
1400                 if (!str) {
1401                         goto failed;
1402                 }
1403         }
1404
1405         if (i->password_history > 0) {
1406                 str = talloc_asprintf_append(str,
1407                                _("cannot repeat any of your previous %d "
1408                                 "passwords; "),
1409                                i->password_history);
1410                 if (!str) {
1411                         goto failed;
1412                 }
1413         }
1414
1415         if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1416                 str = talloc_asprintf_append(str,
1417                                _("must contain capitals, numerals "
1418                                  "or punctuation; "
1419                                  "and cannot contain your account "
1420                                  "or full name; "));
1421                 if (!str) {
1422                         goto failed;
1423                 }
1424         }
1425
1426         str = talloc_asprintf_append(str,
1427                        _("Please type a different password. "
1428                          "Type a password which meets these requirements in "
1429                          "both text boxes."));
1430         if (!str) {
1431                 goto failed;
1432         }
1433
1434         return str;
1435
1436  failed:
1437         TALLOC_FREE(str);
1438         return NULL;
1439 }
1440
1441 static int _pam_create_homedir(struct pwb_context *ctx,
1442                                const char *dirname,
1443                                mode_t mode)
1444 {
1445         struct stat sbuf;
1446
1447         if (stat(dirname, &sbuf) == 0) {
1448                 return PAM_SUCCESS;
1449         }
1450
1451         if (mkdir(dirname, mode) != 0) {
1452
1453                 _make_remark_format(ctx, PAM_TEXT_INFO,
1454                                     _("Creating directory: %s failed: %s"),
1455                                     dirname, strerror(errno));
1456                 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1457                  dirname, strerror(errno));
1458                  return PAM_PERM_DENIED;
1459         }
1460
1461         return PAM_SUCCESS;
1462 }
1463
1464 static int _pam_chown_homedir(struct pwb_context *ctx,
1465                               const char *dirname,
1466                               uid_t uid,
1467                               gid_t gid)
1468 {
1469         if (chown(dirname, uid, gid) != 0) {
1470                 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1471                          dirname, strerror(errno));
1472                 return PAM_PERM_DENIED;
1473         }
1474
1475         return PAM_SUCCESS;
1476 }
1477
1478 static int _pam_mkhomedir(struct pwb_context *ctx)
1479 {
1480         struct passwd *pwd = NULL;
1481         char *token = NULL;
1482         char *create_dir = NULL;
1483         char *user_dir = NULL;
1484         int ret;
1485         const char *username;
1486         mode_t mode = 0700;
1487         char *safe_ptr = NULL;
1488         char *p = NULL;
1489
1490         /* Get the username */
1491         ret = pam_get_user(ctx->pamh, &username, NULL);
1492         if ((ret != PAM_SUCCESS) || (!username)) {
1493                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1494                 return PAM_SERVICE_ERR;
1495         }
1496
1497         pwd = getpwnam(username);
1498         if (pwd == NULL) {
1499                 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1500                 return PAM_USER_UNKNOWN;
1501         }
1502         _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1503
1504         ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1505         if (ret == PAM_SUCCESS) {
1506                 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1507                                          pwd->pw_uid,
1508                                          pwd->pw_gid);
1509         }
1510
1511         if (ret == PAM_SUCCESS) {
1512                 return ret;
1513         }
1514
1515         /* maybe we need to create parent dirs */
1516         create_dir = talloc_strdup(ctx, "/");
1517         if (!create_dir) {
1518                 return PAM_BUF_ERR;
1519         }
1520
1521         /* find final directory */
1522         user_dir = strrchr(pwd->pw_dir, '/');
1523         if (!user_dir) {
1524                 return PAM_BUF_ERR;
1525         }
1526         user_dir++;
1527
1528         _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1529
1530         p = pwd->pw_dir;
1531
1532         while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1533
1534                 mode = 0755;
1535
1536                 p = NULL;
1537
1538                 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1539
1540                 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1541                 if (!create_dir) {
1542                         return PAM_BUF_ERR;
1543                 }
1544                 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1545
1546                 if (strcmp(token, user_dir) == 0) {
1547                         _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1548                         mode = 0700;
1549                 }
1550
1551                 ret = _pam_create_homedir(ctx, create_dir, mode);
1552                 if (ret) {
1553                         return ret;
1554                 }
1555         }
1556
1557         return _pam_chown_homedir(ctx, create_dir,
1558                                   pwd->pw_uid,
1559                                   pwd->pw_gid);
1560 }
1561
1562 /* talk to winbindd */
1563 static int winbind_auth_request(struct pwb_context *ctx,
1564                                 const char *user,
1565                                 const char *pass,
1566                                 const char *member,
1567                                 const char *cctype,
1568                                 const int warn_pwd_expire,
1569                                 struct wbcAuthErrorInfo **p_error,
1570                                 struct wbcLogonUserInfo **p_info,
1571                                 struct wbcUserPasswordPolicyInfo **p_policy,
1572                                 time_t *pwd_last_set,
1573                                 char **user_ret)
1574 {
1575         wbcErr wbc_status;
1576
1577         struct wbcLogonUserParams logon;
1578         char membership_of[1024];
1579         uid_t user_uid = -1;
1580         uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1581                          WBFLAG_PAM_GET_PWD_POLICY;
1582
1583         struct wbcLogonUserInfo *info = NULL;
1584         struct wbcAuthUserInfo *user_info = NULL;
1585         struct wbcAuthErrorInfo *error = NULL;
1586         struct wbcUserPasswordPolicyInfo *policy = NULL;
1587
1588         int ret = PAM_AUTH_ERR;
1589         int i;
1590         const char *codes[] = {
1591                 "NT_STATUS_PASSWORD_EXPIRED",
1592                 "NT_STATUS_PASSWORD_MUST_CHANGE",
1593                 "NT_STATUS_INVALID_WORKSTATION",
1594                 "NT_STATUS_INVALID_LOGON_HOURS",
1595                 "NT_STATUS_ACCOUNT_EXPIRED",
1596                 "NT_STATUS_ACCOUNT_DISABLED",
1597                 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1598                 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1599                 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1600                 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1601                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1602                 "NT_STATUS_NO_LOGON_SERVERS",
1603                 "NT_STATUS_WRONG_PASSWORD",
1604                 "NT_STATUS_ACCESS_DENIED"
1605         };
1606
1607         if (pwd_last_set) {
1608                 *pwd_last_set = 0;
1609         }
1610
1611         /* Krb5 auth always has to go against the KDC of the user's realm */
1612
1613         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1614                 flags           |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1615         }
1616
1617         if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1618                 struct passwd *pwd = NULL;
1619
1620                 pwd = getpwnam(user);
1621                 if (pwd == NULL) {
1622                         return PAM_USER_UNKNOWN;
1623                 }
1624                 user_uid        = pwd->pw_uid;
1625         }
1626
1627         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1628
1629                 _pam_log_debug(ctx, LOG_DEBUG,
1630                                "enabling krb5 login flag\n");
1631
1632                 flags           |= WBFLAG_PAM_KRB5 |
1633                                    WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1634         }
1635
1636         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1637                 _pam_log_debug(ctx, LOG_DEBUG,
1638                                "enabling cached login flag\n");
1639                 flags           |= WBFLAG_PAM_CACHED_LOGIN;
1640         }
1641
1642         if (user_ret) {
1643                 *user_ret = NULL;
1644                 flags           |= WBFLAG_PAM_UNIX_NAME;
1645         }
1646
1647         if (cctype != NULL) {
1648                 _pam_log_debug(ctx, LOG_DEBUG,
1649                                "enabling request for a %s krb5 ccache\n",
1650                                cctype);
1651         }
1652
1653         if (member != NULL) {
1654
1655                 ZERO_STRUCT(membership_of);
1656
1657                 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1658                                                           membership_of,
1659                                                           sizeof(membership_of))) {
1660                         _pam_log_debug(ctx, LOG_ERR,
1661                                        "failed to serialize membership of sid "
1662                                        "\"%s\"\n", member);
1663                         return PAM_AUTH_ERR;
1664                 }
1665         }
1666
1667         ZERO_STRUCT(logon);
1668
1669         logon.username                  = user;
1670         logon.password                  = pass;
1671
1672         if (cctype) {
1673                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1674                                              &logon.blobs,
1675                                              "krb5_cc_type",
1676                                              0,
1677                                              (uint8_t *)cctype,
1678                                              strlen(cctype)+1);
1679                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1680                         goto done;
1681                 }
1682         }
1683
1684         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1685                                      &logon.blobs,
1686                                      "flags",
1687                                      0,
1688                                      (uint8_t *)&flags,
1689                                      sizeof(flags));
1690         if (!WBC_ERROR_IS_OK(wbc_status)) {
1691                 goto done;
1692         }
1693
1694         wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1695                                      &logon.blobs,
1696                                      "user_uid",
1697                                      0,
1698                                      (uint8_t *)&user_uid,
1699                                      sizeof(user_uid));
1700         if (!WBC_ERROR_IS_OK(wbc_status)) {
1701                 goto done;
1702         }
1703
1704         if (member) {
1705                 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1706                                              &logon.blobs,
1707                                              "membership_of",
1708                                              0,
1709                                              (uint8_t *)membership_of,
1710                                              sizeof(membership_of));
1711                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1712                         goto done;
1713                 }
1714         }
1715
1716         wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1717         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1718                                           user, "wbcLogonUser");
1719         wbcFreeMemory(logon.blobs);
1720         logon.blobs = NULL;
1721
1722         if (info && info->info) {
1723                 user_info = info->info;
1724         }
1725
1726         if (pwd_last_set && user_info) {
1727                 *pwd_last_set = user_info->pass_last_set_time;
1728         }
1729
1730         if (p_info && info) {
1731                 *p_info = info;
1732         }
1733
1734         if (p_policy && policy) {
1735                 *p_policy = policy;
1736         }
1737
1738         if (p_error && error) {
1739                 /* We want to process the error in the caller. */
1740                 *p_error = error;
1741                 return ret;
1742         }
1743
1744         for (i=0; i<ARRAY_SIZE(codes); i++) {
1745                 int _ret = ret;
1746                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1747                         ret = _ret;
1748                         goto done;
1749                 }
1750         }
1751
1752         if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1753
1754                 bool already_expired = false;
1755
1756                 /* warn a user if the password is about to expire soon */
1757                 _pam_warn_password_expiry(ctx, user_info, policy,
1758                                           warn_pwd_expire,
1759                                           &already_expired);
1760
1761                 if (already_expired == true) {
1762
1763                         SMB_TIME_T last_set = user_info->pass_last_set_time;
1764
1765                         _pam_log_debug(ctx, LOG_DEBUG,
1766                                        "Password has expired "
1767                                        "(Password was last set: %lld, "
1768                                        "the policy says it should expire here "
1769                                        "%lld (now it's: %lu))\n",
1770                                        (long long int)last_set,
1771                                        (long long int)last_set +
1772                                        policy->expire,
1773                                        time(NULL));
1774
1775                         return PAM_AUTHTOK_EXPIRED;
1776                 }
1777
1778                 /* inform about logon type */
1779                 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1780
1781                 /* inform about krb5 failures */
1782                 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1783
1784                 /* set some info3 info for other modules in the stack */
1785                 _pam_set_data_info3(ctx, user_info);
1786
1787                 /* put krb5ccname into env */
1788                 _pam_setup_krb5_env(ctx, info);
1789
1790                 /* If winbindd returned a username, return the pointer to it
1791                  * here. */
1792                 _pam_setup_unix_username(ctx, user_ret, info);
1793         }
1794
1795  done:
1796         if (logon.blobs) {
1797                 wbcFreeMemory(logon.blobs);
1798         }
1799         if (info && info->blobs && !p_info) {
1800                 wbcFreeMemory(info->blobs);
1801         }
1802         if (error && !p_error) {
1803                 wbcFreeMemory(error);
1804         }
1805         if (info && !p_info) {
1806                 wbcFreeMemory(info);
1807         }
1808         if (policy && !p_policy) {
1809                 wbcFreeMemory(policy);
1810         }
1811
1812         return ret;
1813 }
1814
1815 /* talk to winbindd */
1816 static int winbind_chauthtok_request(struct pwb_context *ctx,
1817                                      const char *user,
1818                                      const char *oldpass,
1819                                      const char *newpass,
1820                                      time_t pwd_last_set)
1821 {
1822         wbcErr wbc_status;
1823         struct wbcChangePasswordParams params;
1824         struct wbcAuthErrorInfo *error = NULL;
1825         struct wbcUserPasswordPolicyInfo *policy = NULL;
1826         enum wbcPasswordChangeRejectReason reject_reason = -1;
1827         uint32_t flags = 0;
1828
1829         int i;
1830         const char *codes[] = {
1831                 "NT_STATUS_BACKUP_CONTROLLER",
1832                 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1833                 "NT_STATUS_NO_LOGON_SERVERS",
1834                 "NT_STATUS_ACCESS_DENIED",
1835                 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1836                 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1837                 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1838         };
1839         int ret = PAM_AUTH_ERR;
1840
1841         ZERO_STRUCT(params);
1842
1843         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1844                 flags |= WBFLAG_PAM_KRB5 |
1845                          WBFLAG_PAM_CONTACT_TRUSTDOM;
1846         }
1847
1848         if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1849                 flags |= WBFLAG_PAM_CACHED_LOGIN;
1850         }
1851
1852         params.account_name             = user;
1853         params.level                    = WBC_AUTH_USER_LEVEL_PLAIN;
1854         params.old_password.plaintext   = oldpass;
1855         params.new_password.plaintext   = newpass;
1856         params.flags                    = flags;
1857
1858         wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1859         ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1860                                           user, "wbcChangeUserPasswordEx");
1861
1862         if (WBC_ERROR_IS_OK(wbc_status)) {
1863                 _pam_log(ctx, LOG_NOTICE,
1864                          "user '%s' password changed", user);
1865                 return PAM_SUCCESS;
1866         }
1867
1868         if (!error) {
1869                 wbcFreeMemory(policy);
1870                 return ret;
1871         }
1872
1873         for (i=0; i<ARRAY_SIZE(codes); i++) {
1874                 int _ret = ret;
1875                 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1876                         ret = _ret;
1877                         goto done;
1878                 }
1879         }
1880
1881         if (!strcasecmp(error->nt_string,
1882                         "NT_STATUS_PASSWORD_RESTRICTION")) {
1883
1884                 char *pwd_restriction_string = NULL;
1885                 SMB_TIME_T min_pwd_age = 0;
1886
1887                 if (policy) {
1888                         min_pwd_age     = policy->min_passwordage;
1889                 }
1890
1891                 /* FIXME: avoid to send multiple PAM messages after another */
1892                 switch (reject_reason) {
1893                         case -1:
1894                                 break;
1895                         case WBC_PWD_CHANGE_REJECT_OTHER:
1896                                 if ((min_pwd_age > 0) &&
1897                                     (pwd_last_set + min_pwd_age > time(NULL))) {
1898                                         PAM_WB_REMARK_DIRECT(ctx,
1899                                              "NT_STATUS_PWD_TOO_RECENT");
1900                                 }
1901                                 break;
1902                         case WBC_PWD_CHANGE_REJECT_TOO_SHORT:
1903                                 PAM_WB_REMARK_DIRECT(ctx,
1904                                         "NT_STATUS_PWD_TOO_SHORT");
1905                                 break;
1906                         case WBC_PWD_CHANGE_REJECT_IN_HISTORY:
1907                                 PAM_WB_REMARK_DIRECT(ctx,
1908                                         "NT_STATUS_PWD_HISTORY_CONFLICT");
1909                                 break;
1910                         case WBC_PWD_CHANGE_REJECT_COMPLEXITY:
1911                                 _make_remark(ctx, PAM_ERROR_MSG,
1912                                              _("Password does not meet "
1913                                                "complexity requirements"));
1914                                 break;
1915                         default:
1916                                 _pam_log_debug(ctx, LOG_DEBUG,
1917                                                "unknown password change "
1918                                                "reject reason: %d",
1919                                                reject_reason);
1920                                 break;
1921                 }
1922
1923                 pwd_restriction_string =
1924                         _pam_compose_pwd_restriction_string(ctx, policy);
1925                 if (pwd_restriction_string) {
1926                         _make_remark(ctx, PAM_ERROR_MSG,
1927                                      pwd_restriction_string);
1928                         TALLOC_FREE(pwd_restriction_string);
1929                 }
1930         }
1931  done:
1932         wbcFreeMemory(error);
1933         wbcFreeMemory(policy);
1934
1935         return ret;
1936 }
1937
1938 /*
1939  * Checks if a user has an account
1940  *
1941  * return values:
1942  *       1  = User not found
1943  *       0  = OK
1944  *      -1  = System error
1945  */
1946 static int valid_user(struct pwb_context *ctx,
1947                       const char *user)
1948 {
1949         /* check not only if the user is available over NSS calls, also make
1950          * sure it's really a winbind user, this is important when stacking PAM
1951          * modules in the 'account' or 'password' facility. */
1952
1953         wbcErr wbc_status;
1954         struct passwd *pwd = NULL;
1955         struct passwd *wb_pwd = NULL;
1956
1957         pwd = getpwnam(user);
1958         if (pwd == NULL) {
1959                 return 1;
1960         }
1961
1962         wbc_status = wbcGetpwnam(user, &wb_pwd);
1963         wbcFreeMemory(wb_pwd);
1964         if (!WBC_ERROR_IS_OK(wbc_status)) {
1965                 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
1966                         wbcErrorString(wbc_status));
1967         }
1968
1969         switch (wbc_status) {
1970                 case WBC_ERR_UNKNOWN_USER:
1971                         return 1;
1972                 case WBC_ERR_SUCCESS:
1973                         return 0;
1974                 default:
1975                         break;
1976         }
1977         return -1;
1978 }
1979
1980 static char *_pam_delete(register char *xx)
1981 {
1982         _pam_overwrite(xx);
1983         _pam_drop(xx);
1984         return NULL;
1985 }
1986
1987 /*
1988  * obtain a password from the user
1989  */
1990
1991 static int _winbind_read_password(struct pwb_context *ctx,
1992                                   unsigned int ctrl,
1993                                   const char *comment,
1994                                   const char *prompt1,
1995                                   const char *prompt2,
1996                                   const char **pass)
1997 {
1998         int authtok_flag;
1999         int retval;
2000         const char *item;
2001         char *token;
2002
2003         _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2004
2005         /*
2006          * make sure nothing inappropriate gets returned
2007          */
2008
2009         *pass = token = NULL;
2010
2011         /*
2012          * which authentication token are we getting?
2013          */
2014
2015         if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2016                 authtok_flag = PAM_OLDAUTHTOK;
2017         } else {
2018                 authtok_flag = PAM_AUTHTOK;
2019         }
2020
2021         /*
2022          * should we obtain the password from a PAM item ?
2023          */
2024
2025         if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2026             on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2027                 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
2028                 if (retval != PAM_SUCCESS) {
2029                         /* very strange. */
2030                         _pam_log(ctx, LOG_ALERT,
2031                                  "pam_get_item returned error "
2032                                  "to unix-read-password");
2033                         return retval;
2034                 } else if (item != NULL) {      /* we have a password! */
2035                         *pass = item;
2036                         item = NULL;
2037                         _pam_log(ctx, LOG_DEBUG,
2038                                  "pam_get_item returned a password");
2039                         return PAM_SUCCESS;
2040                 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2041                         return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2042                 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2043                            && off(WINBIND__OLD_PASSWORD, ctrl)) {
2044                         return PAM_AUTHTOK_RECOVER_ERR;
2045                 }
2046         }
2047         /*
2048          * getting here implies we will have to get the password from the
2049          * user directly.
2050          */
2051
2052         {
2053                 struct pam_message msg[3], *pmsg[3];
2054                 struct pam_response *resp;
2055                 int i, replies;
2056
2057                 /* prepare to converse */
2058
2059                 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2060                         pmsg[0] = &msg[0];
2061                         msg[0].msg_style = PAM_TEXT_INFO;
2062                         msg[0].msg = discard_const_p(char, comment);
2063                         i = 1;
2064                 } else {
2065                         i = 0;
2066                 }
2067
2068                 pmsg[i] = &msg[i];
2069                 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2070                 msg[i++].msg = discard_const_p(char, prompt1);
2071                 replies = 1;
2072
2073                 if (prompt2 != NULL) {
2074                         pmsg[i] = &msg[i];
2075                         msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2076                         msg[i++].msg = discard_const_p(char, prompt2);
2077                         ++replies;
2078                 }
2079                 /* so call the conversation expecting i responses */
2080                 resp = NULL;
2081                 retval = converse(ctx->pamh, i, pmsg, &resp);
2082                 if (resp == NULL) {
2083                         if (retval == PAM_SUCCESS) {
2084                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2085                         }
2086                         goto done;
2087                 }
2088                 if (retval != PAM_SUCCESS) {
2089                         _pam_drop_reply(resp, i);
2090                         goto done;
2091                 }
2092
2093                 /* interpret the response */
2094
2095                 token = x_strdup(resp[i - replies].resp);
2096                 if (!token) {
2097                         _pam_log(ctx, LOG_NOTICE,
2098                                  "could not recover "
2099                                  "authentication token");
2100                         retval = PAM_AUTHTOK_RECOVER_ERR;
2101                         goto done;
2102                 }
2103
2104                 if (replies == 2) {
2105                         /* verify that password entered correctly */
2106                         if (!resp[i - 1].resp ||
2107                             strcmp(token, resp[i - 1].resp)) {
2108                                 _pam_delete(token);     /* mistyped */
2109                                 retval = PAM_AUTHTOK_RECOVER_ERR;
2110                                 _make_remark(ctx, PAM_ERROR_MSG,
2111                                              MISTYPED_PASS);
2112                         }
2113                 }
2114
2115                 /*
2116                  * tidy up the conversation (resp_retcode) is ignored
2117                  * -- what is it for anyway? AGM
2118                  */
2119                 _pam_drop_reply(resp, i);
2120         }
2121
2122  done:
2123         if (retval != PAM_SUCCESS) {
2124                 _pam_log_debug(ctx, LOG_DEBUG,
2125                                "unable to obtain a password");
2126                 return retval;
2127         }
2128         /* 'token' is the entered password */
2129
2130         /* we store this password as an item */
2131
2132         retval = pam_set_item(ctx->pamh, authtok_flag, token);
2133         _pam_delete(token);     /* clean it up */
2134         if (retval != PAM_SUCCESS ||
2135             (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
2136
2137                 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2138                 return retval;
2139
2140         }
2141
2142         *pass = item;
2143         item = NULL;            /* break link to password */
2144
2145         return PAM_SUCCESS;
2146 }
2147
2148 static const char *get_conf_item_string(struct pwb_context *ctx,
2149                                         const char *item,
2150                                         int config_flag)
2151 {
2152         int i = 0;
2153         const char *parm_opt = NULL;
2154
2155         if (!(ctx->ctrl & config_flag)) {
2156                 goto out;
2157         }
2158
2159         /* let the pam opt take precedence over the pam_winbind.conf option */
2160         for (i=0; i<ctx->argc; i++) {
2161
2162                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2163                         char *p;
2164
2165                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2166                                 _pam_log(ctx, LOG_INFO,
2167                                          "no \"=\" delimiter for \"%s\" found\n",
2168                                          item);
2169                                 goto out;
2170                         }
2171                         _pam_log_debug(ctx, LOG_INFO,
2172                                        "PAM config: %s '%s'\n", item, p+1);
2173                         return p + 1;
2174                 }
2175         }
2176
2177         if (ctx->dict) {
2178                 char *key = NULL;
2179
2180                 key = talloc_asprintf(ctx, "global:%s", item);
2181                 if (!key) {
2182                         goto out;
2183                 }
2184
2185                 parm_opt = iniparser_getstr(ctx->dict, key);
2186                 TALLOC_FREE(key);
2187
2188                 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2189                                item, parm_opt);
2190         }
2191 out:
2192         return parm_opt;
2193 }
2194
2195 static int get_config_item_int(struct pwb_context *ctx,
2196                                const char *item,
2197                                int config_flag)
2198 {
2199         int i, parm_opt = -1;
2200
2201         if (!(ctx->ctrl & config_flag)) {
2202                 goto out;
2203         }
2204
2205         /* let the pam opt take precedence over the pam_winbind.conf option */
2206         for (i = 0; i < ctx->argc; i++) {
2207
2208                 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2209                         char *p;
2210
2211                         if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2212                                 _pam_log(ctx, LOG_INFO,
2213                                          "no \"=\" delimiter for \"%s\" found\n",
2214                                          item);
2215                                 goto out;
2216                         }
2217                         parm_opt = atoi(p + 1);
2218                         _pam_log_debug(ctx, LOG_INFO,
2219                                        "PAM config: %s '%d'\n",
2220                                        item, parm_opt);
2221                         return parm_opt;
2222                 }
2223         }
2224
2225         if (ctx->dict) {
2226                 char *key = NULL;
2227
2228                 key = talloc_asprintf(ctx, "global:%s", item);
2229                 if (!key) {
2230                         goto out;
2231                 }
2232
2233                 parm_opt = iniparser_getint(ctx->dict, key, -1);
2234                 TALLOC_FREE(key);
2235
2236                 _pam_log_debug(ctx, LOG_INFO,
2237                                "CONFIG file: %s '%d'\n",
2238                                item, parm_opt);
2239         }
2240 out:
2241         return parm_opt;
2242 }
2243
2244 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2245 {
2246         return get_conf_item_string(ctx, "krb5_ccache_type",
2247                                     WINBIND_KRB5_CCACHE_TYPE);
2248 }
2249
2250 static const char *get_member_from_config(struct pwb_context *ctx)
2251 {
2252         const char *ret = NULL;
2253         ret = get_conf_item_string(ctx, "require_membership_of",
2254                                    WINBIND_REQUIRED_MEMBERSHIP);
2255         if (ret) {
2256                 return ret;
2257         }
2258         return get_conf_item_string(ctx, "require-membership-of",
2259                                     WINBIND_REQUIRED_MEMBERSHIP);
2260 }
2261
2262 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2263 {
2264         int ret;
2265         ret = get_config_item_int(ctx, "warn_pwd_expire",
2266                                   WINBIND_WARN_PWD_EXPIRE);
2267         /* no or broken setting */
2268         if (ret <= 0) {
2269                 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2270         }
2271         return ret;
2272 }
2273
2274 /**
2275  * Retrieve the winbind separator.
2276  *
2277  * @param ctx PAM winbind context.
2278  *
2279  * @return string separator character. NULL on failure.
2280  */
2281
2282 static char winbind_get_separator(struct pwb_context *ctx)
2283 {
2284         wbcErr wbc_status;
2285         static struct wbcInterfaceDetails *details = NULL;
2286
2287         wbc_status = wbcInterfaceDetails(&details);
2288         if (!WBC_ERROR_IS_OK(wbc_status)) {
2289                 _pam_log(ctx, LOG_ERR,
2290                          "Could not retrieve winbind interface details: %s",
2291                          wbcErrorString(wbc_status));
2292                 return '\0';
2293         }
2294
2295         if (!details) {
2296                 return '\0';
2297         }
2298
2299         return details->winbind_separator;
2300 }
2301
2302
2303 /**
2304  * Convert a upn to a name.
2305  *
2306  * @param ctx PAM winbind context.
2307  * @param upn  USer UPN to be trabslated.
2308  *
2309  * @return converted name. NULL pointer on failure. Caller needs to free.
2310  */
2311
2312 static char* winbind_upn_to_username(struct pwb_context *ctx,
2313                                      const char *upn)
2314 {
2315         char sep;
2316         wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2317         struct wbcDomainSid sid;
2318         enum wbcSidType type;
2319         char *domain;
2320         char *name;
2321         char *p;
2322
2323         /* This cannot work when the winbind separator = @ */
2324
2325         sep = winbind_get_separator(ctx);
2326         if (!sep || sep == '@') {
2327                 return NULL;
2328         }
2329
2330         name = talloc_strdup(ctx, upn);
2331         if (!name) {
2332                 return NULL;
2333         }
2334
2335         if ((p = strchr(name, '@')) != NULL) {
2336                 *p = 0;
2337                 domain = p + 1;
2338         }
2339
2340         /* Convert the UPN to a SID */
2341
2342         wbc_status = wbcLookupName(domain, name, &sid, &type);
2343         if (!WBC_ERROR_IS_OK(wbc_status)) {
2344                 return NULL;
2345         }
2346
2347         /* Convert the the SID back to the sAMAccountName */
2348
2349         wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2350         if (!WBC_ERROR_IS_OK(wbc_status)) {
2351                 return NULL;
2352         }
2353
2354         return talloc_asprintf(ctx, "%s\\%s", domain, name);
2355 }
2356
2357 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2358                          int argc, const char **argv)
2359 {
2360         int retval = PAM_SUCCESS;
2361         struct pwb_context *ctx = NULL;
2362         struct wbcLogoffUserParams logoff;
2363         struct wbcAuthErrorInfo *error = NULL;
2364         const char *user;
2365         wbcErr wbc_status = WBC_ERR_SUCCESS;
2366
2367         ZERO_STRUCT(logoff);
2368
2369         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2370         if (retval) {
2371                 goto out;
2372         }
2373
2374         _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2375
2376         if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2377
2378                 /* destroy the ccache here */
2379
2380                 uint32_t wbc_flags = 0;
2381                 const char *ccname = NULL;
2382                 struct passwd *pwd = NULL;
2383
2384                 retval = pam_get_user(pamh, &user, _("Username: "));
2385                 if (retval) {
2386                         _pam_log(ctx, LOG_ERR,
2387                                  "could not identify user");
2388                         goto out;
2389                 }
2390
2391                 if (user == NULL) {
2392                         _pam_log(ctx, LOG_ERR,
2393                                  "username was NULL!");
2394                         retval = PAM_USER_UNKNOWN;
2395                         goto out;
2396                 }
2397
2398                 _pam_log_debug(ctx, LOG_DEBUG,
2399                                "username [%s] obtained", user);
2400
2401                 ccname = pam_getenv(pamh, "KRB5CCNAME");
2402                 if (ccname == NULL) {
2403                         _pam_log_debug(ctx, LOG_DEBUG,
2404                                        "user has no KRB5CCNAME environment");
2405                 }
2406
2407                 pwd = getpwnam(user);
2408                 if (pwd == NULL) {
2409                         retval = PAM_USER_UNKNOWN;
2410                         goto out;
2411                 }
2412
2413                 wbc_flags = WBFLAG_PAM_KRB5 |
2414                         WBFLAG_PAM_CONTACT_TRUSTDOM;
2415
2416                 logoff.username         = user;
2417
2418                 if (ccname) {
2419                         wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2420                                                      &logoff.blobs,
2421                                                      "ccfilename",
2422                                                      0,
2423                                                      (uint8_t *)ccname,
2424                                                      strlen(ccname)+1);
2425                         if (!WBC_ERROR_IS_OK(wbc_status)) {
2426                                 goto out;
2427                         }
2428                 }
2429
2430                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2431                                              &logoff.blobs,
2432                                              "flags",
2433                                              0,
2434                                              (uint8_t *)&wbc_flags,
2435                                              sizeof(wbc_flags));
2436                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2437                         goto out;
2438                 }
2439
2440                 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2441                                              &logoff.blobs,
2442                                              "user_uid",
2443                                              0,
2444                                              (uint8_t *)&pwd->pw_uid,
2445                                              sizeof(pwd->pw_uid));
2446                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2447                         goto out;
2448                 }
2449
2450                 wbc_status = wbcLogoffUserEx(&logoff, &error);
2451                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2452                                                      user, "wbcLogoffUser");
2453                 wbcFreeMemory(error);
2454                 wbcFreeMemory(logoff.blobs);
2455                 logoff.blobs = NULL;
2456
2457                 if (!WBC_ERROR_IS_OK(wbc_status)) {
2458                         _pam_log(ctx, LOG_INFO,
2459                                  "failed to logoff user %s: %s\n",
2460                                          user, wbcErrorString(wbc_status));
2461                 }
2462         }
2463
2464 out:
2465         if (logoff.blobs) {
2466                 wbcFreeMemory(logoff.blobs);
2467         }
2468
2469         if (!WBC_ERROR_IS_OK(wbc_status)) {
2470                 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2471                      user, "wbcLogoffUser");
2472         }
2473
2474         /*
2475          * Delete the krb5 ccname variable from the PAM environment
2476          * if it was set by winbind.
2477          */
2478         if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2479                 pam_putenv(pamh, "KRB5CCNAME");
2480         }
2481
2482         _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2483
2484         TALLOC_FREE(ctx);
2485
2486         return retval;
2487 }
2488
2489 PAM_EXTERN
2490 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2491                         int argc, const char **argv)
2492 {
2493         const char *username;
2494         const char *password;
2495         const char *member = NULL;
2496         const char *cctype = NULL;
2497         int warn_pwd_expire;
2498         int retval = PAM_AUTH_ERR;
2499         char *username_ret = NULL;
2500         char *new_authtok_required = NULL;
2501         char *real_username = NULL;
2502         struct pwb_context *ctx = NULL;
2503
2504         retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2505         if (retval) {
2506                 goto out;
2507         }
2508
2509         _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2510
2511         /* Get the username */
2512         retval = pam_get_user(pamh, &username, NULL);
2513         if ((retval != PAM_SUCCESS) || (!username)) {
2514                 _pam_log_debug(ctx, LOG_DEBUG,
2515                                "can not get the username");
2516                 retval = PAM_SERVICE_ERR;
2517                 goto out;
2518         }
2519
2520
2521 #if defined(AIX)
2522         /* Decode the user name since AIX does not support logn user
2523            names by default.  The name is encoded as _#uid.  */
2524
2525         if (username[0] == '_') {
2526                 uid_t id = atoi(&username[1]);
2527                 struct passwd *pw = NULL;
2528
2529                 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2530                         real_username = strdup(pw->pw_name);
2531                 }
2532         }
2533 #endif
2534
2535         if (!real_username) {
2536                 /* Just making a copy of the username we got from PAM */
2537                 if ((real_username = strdup(username)) == NULL) {
2538                         _pam_log_debug(ctx, LOG_DEBUG,
2539                                        "memory allocation failure when copying "
2540                                        "username");
2541                         retval = PAM_SERVICE_ERR;
2542                         goto out;
2543                 }
2544         }
2545
2546         /* Maybe this was a UPN */
2547
2548         if (strchr(real_username, '@') != NULL) {
2549                 char *samaccountname = NULL;
2550
2551                 samaccountname = winbind_upn_to_username(ctx,
2552                                                          real_username);
2553                 if (samaccountname) {
2554                         free(real_username);
2555                         real_username = strdup(samaccountname);
2556                 }
2557         }
2558
2559         retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2560                                         _("Password: "), NULL,
2561                                         &password);
2562
2563         if (retval != PAM_SUCCESS) {
2564                 _pam_log(ctx, LOG_ERR,
2565                          "Could not retrieve user's password");
2566                 retval = PAM_AUTHTOK_ERR;
2567                 goto out;
2568         }
2569
2570         /* Let's not give too much away in the log file */
2571
2572 #ifdef DEBUG_PASSWORD
2573         _pam_log_debug(ctx, LOG_INFO,
2574                        "Verify user '%s' with password '%s'",
2575                        real_username, password);
2576 #else
2577         _pam_log_debug(ctx, LOG_INFO,
2578                        "Verify user '%s'", real_username);
2579 #endif
2580
2581         member = get_member_from_config(ctx);
2582         cctype = get_krb5_cc_type_from_config(ctx);
2583         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2584
2585         /* Now use the username to look up password */
2586         retval = winbind_auth_request(ctx, real_username, password,
2587                                       member, cctype, warn_pwd_expire,
2588                                       NULL, NULL, NULL,
2589                                       NULL, &username_ret);
2590
2591         if (retval == PAM_NEW_AUTHTOK_REQD ||
2592             retval == PAM_AUTHTOK_EXPIRED) {
2593
2594                 char *new_authtok_required_during_auth = NULL;
2595
2596                 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2597                 if (!new_authtok_required) {
2598                         retval = PAM_BUF_ERR;
2599                         goto out;
2600                 }
2601
2602                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2603                              new_authtok_required,
2604                              _pam_winbind_cleanup_func);
2605
2606                 retval = PAM_SUCCESS;
2607
2608                 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2609                 if (!new_authtok_required_during_auth) {
2610                         retval = PAM_BUF_ERR;
2611                         goto out;
2612                 }
2613
2614                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2615                              new_authtok_required_during_auth,
2616                              _pam_winbind_cleanup_func);
2617
2618                 goto out;
2619         }
2620
2621 out:
2622         if (username_ret) {
2623                 pam_set_item (pamh, PAM_USER, username_ret);
2624                 _pam_log_debug(ctx, LOG_INFO,
2625                                "Returned user was '%s'", username_ret);
2626                 free(username_ret);
2627         }
2628
2629         if (real_username) {
2630                 free(real_username);
2631         }
2632
2633         if (!new_authtok_required) {
2634                 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2635         }
2636
2637         if (retval != PAM_SUCCESS) {
2638                 _pam_free_data_info3(pamh);
2639         }
2640
2641         _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2642
2643         TALLOC_FREE(ctx);
2644
2645         return retval;
2646 }
2647
2648 PAM_EXTERN
2649 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2650                    int argc, const char **argv)
2651 {
2652         int ret = PAM_SYSTEM_ERR;
2653         struct pwb_context *ctx = NULL;
2654
2655         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2656         if (ret) {
2657                 goto out;
2658         }
2659
2660         _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2661
2662         switch (flags & ~PAM_SILENT) {
2663
2664                 case PAM_DELETE_CRED:
2665                         ret = _pam_delete_cred(pamh, flags, argc, argv);
2666                         break;
2667                 case PAM_REFRESH_CRED:
2668                         _pam_log_debug(ctx, LOG_WARNING,
2669                                        "PAM_REFRESH_CRED not implemented");
2670                         ret = PAM_SUCCESS;
2671                         break;
2672                 case PAM_REINITIALIZE_CRED:
2673                         _pam_log_debug(ctx, LOG_WARNING,
2674                                        "PAM_REINITIALIZE_CRED not implemented");
2675                         ret = PAM_SUCCESS;
2676                         break;
2677                 case PAM_ESTABLISH_CRED:
2678                         _pam_log_debug(ctx, LOG_WARNING,
2679                                        "PAM_ESTABLISH_CRED not implemented");
2680                         ret = PAM_SUCCESS;
2681                         break;
2682                 default:
2683                         ret = PAM_SYSTEM_ERR;
2684                         break;
2685         }
2686
2687  out:
2688
2689         _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2690
2691         TALLOC_FREE(ctx);
2692
2693         return ret;
2694 }
2695
2696 /*
2697  * Account management. We want to verify that the account exists
2698  * before returning PAM_SUCCESS
2699  */
2700 PAM_EXTERN
2701 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2702                    int argc, const char **argv)
2703 {
2704         const char *username;
2705         int ret = PAM_USER_UNKNOWN;
2706         void *tmp = NULL;
2707         struct pwb_context *ctx = NULL;
2708
2709         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2710         if (ret) {
2711                 goto out;
2712         }
2713
2714         _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2715
2716
2717         /* Get the username */
2718         ret = pam_get_user(pamh, &username, NULL);
2719         if ((ret != PAM_SUCCESS) || (!username)) {
2720                 _pam_log_debug(ctx, LOG_DEBUG,
2721                                "can not get the username");
2722                 ret = PAM_SERVICE_ERR;
2723                 goto out;
2724         }
2725
2726         /* Verify the username */
2727         ret = valid_user(ctx, username);
2728         switch (ret) {
2729         case -1:
2730                 /* some sort of system error. The log was already printed */
2731                 ret = PAM_SERVICE_ERR;
2732                 goto out;
2733         case 1:
2734                 /* the user does not exist */
2735                 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2736                                username);
2737                 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2738                         ret = PAM_IGNORE;
2739                         goto out;
2740                 }
2741                 ret = PAM_USER_UNKNOWN;
2742                 goto out;
2743         case 0:
2744                 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2745                              (const void **)&tmp);
2746                 if (tmp != NULL) {
2747                         ret = atoi((const char *)tmp);
2748                         switch (ret) {
2749                         case PAM_AUTHTOK_EXPIRED:
2750                                 /* fall through, since new token is required in this case */
2751                         case PAM_NEW_AUTHTOK_REQD:
2752                                 _pam_log(ctx, LOG_WARNING,
2753                                          "pam_sm_acct_mgmt success but %s is set",
2754                                          PAM_WINBIND_NEW_AUTHTOK_REQD);
2755                                 _pam_log(ctx, LOG_NOTICE,
2756                                          "user '%s' needs new password",
2757                                          username);
2758                                 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2759                                 ret = PAM_NEW_AUTHTOK_REQD;
2760                                 goto out;
2761                         default:
2762                                 _pam_log(ctx, LOG_WARNING,
2763                                          "pam_sm_acct_mgmt success");
2764                                 _pam_log(ctx, LOG_NOTICE,
2765                                          "user '%s' granted access", username);
2766                                 ret = PAM_SUCCESS;
2767                                 goto out;
2768                         }
2769                 }
2770
2771                 /* Otherwise, the authentication looked good */
2772                 _pam_log(ctx, LOG_NOTICE,
2773                          "user '%s' granted access", username);
2774                 ret = PAM_SUCCESS;
2775                 goto out;
2776         default:
2777                 /* we don't know anything about this return value */
2778                 _pam_log(ctx, LOG_ERR,
2779                          "internal module error (ret = %d, user = '%s')",
2780                          ret, username);
2781                 ret = PAM_SERVICE_ERR;
2782                 goto out;
2783         }
2784
2785         /* should not be reached */
2786         ret = PAM_IGNORE;
2787
2788  out:
2789
2790         _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2791
2792         TALLOC_FREE(ctx);
2793
2794         return ret;
2795 }
2796
2797 PAM_EXTERN
2798 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2799                         int argc, const char **argv)
2800 {
2801         int ret = PAM_SUCCESS;
2802         struct pwb_context *ctx = NULL;
2803
2804         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2805         if (ret) {
2806                 goto out;
2807         }
2808
2809         _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2810
2811         if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2812                 /* check and create homedir */
2813                 ret = _pam_mkhomedir(ctx);
2814         }
2815  out:
2816         _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2817
2818         TALLOC_FREE(ctx);
2819
2820         return ret;
2821 }
2822
2823 PAM_EXTERN
2824 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2825                          int argc, const char **argv)
2826 {
2827         int ret = PAM_SUCCESS;
2828         struct pwb_context *ctx = NULL;
2829
2830         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2831         if (ret) {
2832                 goto out;
2833         }
2834
2835         _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2836
2837 out:
2838         _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2839
2840         TALLOC_FREE(ctx);
2841
2842         return ret;
2843 }
2844
2845 /**
2846  * evaluate whether we need to re-authenticate with kerberos after a
2847  * password change
2848  *
2849  * @param ctx PAM winbind context.
2850  * @param user The username
2851  *
2852  * @return boolean Returns true if required, false if not.
2853  */
2854
2855 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2856                                                    const char *user)
2857 {
2858
2859         /* Make sure that we only do this if a) the chauthtok got initiated
2860          * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2861          * later password change via the "passwd" command if done by the user
2862          * itself
2863          * NB. If we login from gdm or xdm and the password expires,
2864          * we change the password, but there is no memory cache.
2865          * Thus, even for passthrough login, we should do the
2866          * authentication again to update memory cache.
2867          * --- BoYang
2868          * */
2869
2870         char *new_authtok_reqd_during_auth = NULL;
2871         struct passwd *pwd = NULL;
2872
2873         _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2874                       &new_authtok_reqd_during_auth);
2875         pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2876                      NULL, NULL);
2877
2878         if (new_authtok_reqd_during_auth) {
2879                 return true;
2880         }
2881
2882         pwd = getpwnam(user);
2883         if (!pwd) {
2884                 return false;
2885         }
2886
2887         if (getuid() == pwd->pw_uid) {
2888                 return true;
2889         }
2890
2891         return false;
2892 }
2893
2894
2895 PAM_EXTERN
2896 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2897                      int argc, const char **argv)
2898 {
2899         unsigned int lctrl;
2900         int ret;
2901         bool cached_login = false;
2902
2903         /* <DO NOT free() THESE> */
2904         const char *user;
2905         char *pass_old, *pass_new;
2906         /* </DO NOT free() THESE> */
2907
2908         char *Announce;
2909
2910         int retry = 0;
2911         char *username_ret = NULL;
2912         struct wbcAuthErrorInfo *error = NULL;
2913         struct pwb_context *ctx = NULL;
2914
2915         ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2916         if (ret) {
2917                 goto out;
2918         }
2919
2920         _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
2921
2922         cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
2923
2924         /* clearing offline bit for auth */
2925         ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
2926
2927         /*
2928          * First get the name of a user
2929          */
2930         ret = pam_get_user(pamh, &user, _("Username: "));
2931         if (ret) {
2932                 _pam_log(ctx, LOG_ERR,
2933                          "password - could not identify user");
2934                 goto out;
2935         }
2936
2937         if (user == NULL) {
2938                 _pam_log(ctx, LOG_ERR, "username was NULL!");
2939                 ret = PAM_USER_UNKNOWN;
2940                 goto out;
2941         }
2942
2943         _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
2944
2945         /* check if this is really a user in winbindd, not only in NSS */
2946         ret = valid_user(ctx, user);
2947         switch (ret) {
2948                 case 1:
2949                         ret = PAM_USER_UNKNOWN;
2950                         goto out;
2951                 case -1:
2952                         ret = PAM_SYSTEM_ERR;
2953                         goto out;
2954                 default:
2955                         break;
2956         }
2957
2958         /*
2959          * obtain and verify the current password (OLDAUTHTOK) for
2960          * the user.
2961          */
2962
2963         if (flags & PAM_PRELIM_CHECK) {
2964                 time_t pwdlastset_prelim = 0;
2965
2966                 /* instruct user what is happening */
2967
2968 #define greeting _("Changing password for")
2969                 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
2970                 if (!Announce) {
2971                         _pam_log(ctx, LOG_CRIT,
2972                                  "password - out of memory");
2973                         ret = PAM_BUF_ERR;
2974                         goto out;
2975                 }
2976 #undef greeting
2977
2978                 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
2979                 ret = _winbind_read_password(ctx, lctrl,
2980                                                 Announce,
2981                                                 _("(current) NT password: "),
2982                                                 NULL,
2983                                                 (const char **) &pass_old);
2984                 TALLOC_FREE(Announce);
2985                 if (ret != PAM_SUCCESS) {
2986                         _pam_log(ctx, LOG_NOTICE,
2987                                  "password - (old) token not obtained");
2988                         goto out;
2989                 }
2990
2991                 /* verify that this is the password for this user */
2992
2993                 ret = winbind_auth_request(ctx, user, pass_old,
2994                                            NULL, NULL, 0,
2995                                            &error, NULL, NULL,
2996                                            &pwdlastset_prelim, NULL);
2997
2998                 if (ret != PAM_ACCT_EXPIRED &&
2999                     ret != PAM_AUTHTOK_EXPIRED &&
3000                     ret != PAM_NEW_AUTHTOK_REQD &&
3001                     ret != PAM_SUCCESS) {
3002                         pass_old = NULL;
3003                         goto out;
3004                 }
3005
3006                 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3007                              (void *)pwdlastset_prelim, NULL);
3008
3009                 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3010                                    (const void *) pass_old);
3011                 pass_old = NULL;
3012                 if (ret != PAM_SUCCESS) {
3013                         _pam_log(ctx, LOG_CRIT,
3014                                  "failed to set PAM_OLDAUTHTOK");
3015                 }
3016         } else if (flags & PAM_UPDATE_AUTHTOK) {
3017
3018                 time_t pwdlastset_update = 0;
3019
3020                 /*
3021                  * obtain the proposed password
3022                  */
3023
3024                 /*
3025                  * get the old token back.
3026                  */
3027
3028                 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
3029
3030                 if (ret != PAM_SUCCESS) {
3031                         _pam_log(ctx, LOG_NOTICE,
3032                                  "user not authenticated");
3033                         goto out;
3034                 }
3035
3036                 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3037
3038                 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3039                         lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3040                 }
3041                 retry = 0;
3042                 ret = PAM_AUTHTOK_ERR;
3043                 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3044                         /*
3045                          * use_authtok is to force the use of a previously entered
3046                          * password -- needed for pluggable password strength checking
3047                          */
3048
3049                         ret = _winbind_read_password(ctx, lctrl,
3050                                                      NULL,
3051                                                      _("Enter new NT password: "),
3052                                                      _("Retype new NT password: "),
3053                                                      (const char **)&pass_new);
3054
3055                         if (ret != PAM_SUCCESS) {
3056                                 _pam_log_debug(ctx, LOG_ALERT,
3057                                                "password - "
3058                                                "new password not obtained");
3059                                 pass_old = NULL;/* tidy up */
3060                                 goto out;
3061                         }
3062
3063                         /*
3064                          * At this point we know who the user is and what they
3065                          * propose as their new password. Verify that the new
3066                          * password is acceptable.
3067                          */
3068
3069                         if (pass_new[0] == '\0') {/* "\0" password = NULL */
3070                                 pass_new = NULL;
3071                         }
3072                 }
3073
3074                 /*
3075                  * By reaching here we have approved the passwords and must now
3076                  * rebuild the password database file.
3077                  */
3078                 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3079                               &pwdlastset_update);
3080
3081                 /*
3082                  * if cached creds were enabled, make sure to set the
3083                  * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3084                  * update the cached creds storage - gd
3085                  */
3086                 if (cached_login) {
3087                         ctx->ctrl |= WINBIND_CACHED_LOGIN;
3088                 }
3089
3090                 ret = winbind_chauthtok_request(ctx, user, pass_old,
3091                                                 pass_new, pwdlastset_update);
3092                 if (ret) {
3093                         pass_old = pass_new = NULL;
3094                         goto out;
3095                 }
3096
3097                 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3098
3099                         const char *member = NULL;
3100                         const char *cctype = NULL;
3101                         int warn_pwd_expire;
3102                         struct wbcLogonUserInfo *info = NULL;
3103                         struct wbcUserPasswordPolicyInfo *policy = NULL;
3104
3105                         member = get_member_from_config(ctx);
3106                         cctype = get_krb5_cc_type_from_config(ctx);
3107                         warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3108
3109                         /* Keep WINBIND_CACHED_LOGIN bit for
3110                          * authentication after changing the password.
3111                          * This will update the cached credentials in case
3112                          * that winbindd_dual_pam_chauthtok() fails
3113                          * to update them.
3114                          * --- BoYang
3115                          * */
3116
3117                         ret = winbind_auth_request(ctx, user, pass_new,
3118                                                    member, cctype, 0,
3119                                                    &error, &info, &policy,
3120                                                    NULL, &username_ret);
3121                         pass_old = pass_new = NULL;
3122
3123                         if (ret == PAM_SUCCESS) {
3124
3125                                 struct wbcAuthUserInfo *user_info = NULL;
3126
3127                                 if (info && info->info) {
3128                                         user_info = info->info;
3129                                 }
3130
3131                                 /* warn a user if the password is about to
3132                                  * expire soon */
3133                                 _pam_warn_password_expiry(ctx, user_info, policy,
3134                                                           warn_pwd_expire,
3135                                                           NULL);
3136
3137                                 /* set some info3 info for other modules in the
3138                                  * stack */
3139                                 _pam_set_data_info3(ctx, user_info);
3140
3141                                 /* put krb5ccname into env */
3142                                 _pam_setup_krb5_env(ctx, info);
3143
3144                                 if (username_ret) {
3145                                         pam_set_item(pamh, PAM_USER,
3146                                                      username_ret);
3147                                         _pam_log_debug(ctx, LOG_INFO,
3148                                                        "Returned user was '%s'",
3149                                                        username_ret);
3150                                         free(username_ret);
3151                                 }
3152
3153                         }
3154
3155                         if (info && info->blobs) {
3156                                 wbcFreeMemory(info->blobs);
3157                         }
3158                         wbcFreeMemory(info);
3159                         wbcFreeMemory(policy);
3160
3161                         goto out;
3162                 }
3163         } else {
3164                 ret = PAM_SERVICE_ERR;
3165         }
3166
3167 out:
3168         {
3169                 /* Deal with offline errors. */
3170                 int i;
3171                 const char *codes[] = {
3172                         "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3173                         "NT_STATUS_NO_LOGON_SERVERS",
3174                         "NT_STATUS_ACCESS_DENIED"
3175                 };
3176
3177                 for (i=0; i<ARRAY_SIZE(codes); i++) {
3178                         int _ret;
3179                         if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3180                                 break;
3181                         }
3182                 }
3183         }
3184
3185         wbcFreeMemory(error);
3186
3187         _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3188
3189         TALLOC_FREE(ctx);
3190
3191         return ret;
3192 }
3193
3194 #ifdef PAM_STATIC
3195
3196 /* static module data */
3197
3198 struct pam_module _pam_winbind_modstruct = {
3199         MODULE_NAME,
3200         pam_sm_authenticate,
3201         pam_sm_setcred,
3202         pam_sm_acct_mgmt,
3203         pam_sm_open_session,
3204         pam_sm_close_session,
3205         pam_sm_chauthtok
3206 };
3207
3208 #endif
3209
3210 /*
3211  * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
3212  * Copyright (c) Tim Potter       <tpot@samba.org>     2000
3213  * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3214  * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2008
3215  * Copyright (c) Jan Rêkorajski 1999.
3216  * Copyright (c) Andrew G. Morgan 1996-8.
3217  * Copyright (c) Alex O. Yuriev, 1996.
3218  * Copyright (c) Cristian Gafton 1996.
3219  * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3220  *
3221  * Redistribution and use in source and binary forms, with or without
3222  * modification, are permitted provided that the following conditions
3223  * are met:
3224  * 1. Redistributions of source code must retain the above copyright
3225  *    notice, and the entire permission notice in its entirety,
3226  *    including the disclaimer of warranties.
3227  * 2. Redistributions in binary form must reproduce the above copyright
3228  *    notice, this list of conditions and the following disclaimer in the
3229  *    documentation and/or other materials provided with the distribution.
3230  * 3. The name of the author may not be used to endorse or promote
3231  *    products derived from this software without specific prior
3232  *    written permission.
3233  *
3234  * ALTERNATIVELY, this product may be distributed under the terms of
3235  * the GNU Public License, in which case the provisions of the GPL are
3236  * required INSTEAD OF the above restrictions.  (This clause is
3237  * necessary due to a potential bad interaction between the GPL and
3238  * the restrictions contained in a BSD-style copyright.)
3239  *
3240  * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3241  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3242  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3243  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3244  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3245  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3246  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3247  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3248  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3249  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3250  * OF THE POSSIBILITY OF SUCH DAMAGE.
3251  */