/* pam_winbind module Copyright Andrew Tridgell 2000 Copyright Tim Potter 2000 Copyright Andrew Bartlett 2002 Copyright Guenther Deschner 2005-2007 largely based on pam_userdb by Cristian Gafton also contains large slabs of code from pam_unix by Elliot Lee (see copyright below for full details) */ #include "pam_winbind.h" #define _PAM_LOG_FUNCTION_ENTER(function, pamh, ctrl, flags) \ do { \ _pam_log_debug(pamh, ctrl, LOG_DEBUG, "[pamh: 0x%08x] ENTER: " function " (flags: 0x%04x)", (uint32) pamh, flags); \ _pam_log_state(pamh, ctrl); \ } while (0) #define _PAM_LOG_FUNCTION_LEAVE(function, pamh, ctrl, retval) \ do { \ _pam_log_debug(pamh, ctrl, LOG_DEBUG, "[pamh: 0x%08x] LEAVE: " function " returning %d", (uint32) pamh, retval); \ _pam_log_state(pamh, ctrl); \ } while (0) /* data tokens */ #define MAX_PASSWD_TRIES 3 /* * Work around the pam API that has functions with void ** as parameters. * These lead to strict aliasing warnings with gcc. */ static int _pam_get_item(const pam_handle_t *pamh, int item_type, const void *_item) { const void **item = (const void **)_item; return pam_get_item(pamh, item_type, item); } static int _pam_get_data(const pam_handle_t *pamh, const char *module_data_name, const void *_data) { const void **data = (const void **)_data; return pam_get_data(pamh, module_data_name, data); } /* some syslogging */ #ifdef HAVE_PAM_VSYSLOG static void _pam_log_int(const pam_handle_t *pamh, int err, const char *format, va_list args) { pam_vsyslog(pamh, err, format, args); } #else static void _pam_log_int(const pam_handle_t *pamh, int err, const char *format, va_list args) { char *format2 = NULL; const char *service; _pam_get_item(pamh, PAM_SERVICE, &service); format2 = malloc(strlen(MODULE_NAME)+strlen(format)+strlen(service)+5); if (format2 == NULL) { /* what else todo ? */ vsyslog(err, format, args); return; } sprintf(format2, "%s(%s): %s", MODULE_NAME, service, format); vsyslog(err, format2, args); SAFE_FREE(format2); } #endif /* HAVE_PAM_VSYSLOG */ static BOOL _pam_log_is_silent(int ctrl) { return on(ctrl, WINBIND_SILENT); } static void _pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5); static void _pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) { va_list args; if (_pam_log_is_silent(ctrl)) { return; } va_start(args, format); _pam_log_int(pamh, err, format, args); va_end(args); } static BOOL _pam_log_is_debug_enabled(int ctrl) { if (ctrl == -1) { return False; } if (_pam_log_is_silent(ctrl)) { return False; } if (!(ctrl & WINBIND_DEBUG_ARG)) { return False; } return True; } static BOOL _pam_log_is_debug_state_enabled(int ctrl) { if (!(ctrl & WINBIND_DEBUG_STATE)) { return False; } return _pam_log_is_debug_enabled(ctrl); } static void _pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5); static void _pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) { va_list args; if (!_pam_log_is_debug_enabled(ctrl)) { return; } va_start(args, format); _pam_log_int(pamh, err, format, args); va_end(args); } static void _pam_log_state_datum(const pam_handle_t *pamh, int ctrl, int item_type, const char *key, int is_string) { const void *data = NULL; if (item_type != 0) { pam_get_item(pamh, item_type, &data); } else { pam_get_data(pamh, key, &data); } if (data != NULL) { const char *type = (item_type != 0) ? "ITEM" : "DATA"; if (is_string != 0) { _pam_log_debug(pamh, ctrl, LOG_DEBUG, "[pamh: 0x%08x] STATE: %s(%s) = \"%s\" (0x%08x)", (uint32) pamh, type, key, (const char *) data, (uint32) data); } else { _pam_log_debug(pamh, ctrl, LOG_DEBUG, "[pamh: 0x%08x] STATE: %s(%s) = 0x%08x", (uint32) pamh, type, key, (uint32) data); } } } #define _PAM_LOG_STATE_DATA_POINTER(pamh, ctrl, module_data_name) \ _pam_log_state_datum(pamh, ctrl, 0, module_data_name, 0) #define _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, module_data_name) \ _pam_log_state_datum(pamh, ctrl, 0, module_data_name, 1) #define _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, item_type) \ _pam_log_state_datum(pamh, ctrl, item_type, #item_type, 0) #define _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, item_type) \ _pam_log_state_datum(pamh, ctrl, item_type, #item_type, 1) #ifdef DEBUG_PASSWORD #define _LOG_PASSWORD_AS_STRING 1 #else #define _LOG_PASSWORD_AS_STRING 0 #endif #define _PAM_LOG_STATE_ITEM_PASSWORD(pamh, ctrl, item_type) \ _pam_log_state_datum(pamh, ctrl, item_type, #item_type, _LOG_PASSWORD_AS_STRING) static void _pam_log_state(const pam_handle_t *pamh, int ctrl) { if (!_pam_log_is_debug_state_enabled(ctrl)) { return; } _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_SERVICE); _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_USER); _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_TTY); _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_RHOST); _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_RUSER); _PAM_LOG_STATE_ITEM_PASSWORD(pamh, ctrl, PAM_OLDAUTHTOK); _PAM_LOG_STATE_ITEM_PASSWORD(pamh, ctrl, PAM_AUTHTOK); _PAM_LOG_STATE_ITEM_STRING(pamh, ctrl, PAM_USER_PROMPT); _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, PAM_CONV); #ifdef PAM_FAIL_DELAY _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, PAM_FAIL_DELAY); #endif #ifdef PAM_REPOSITORY _PAM_LOG_STATE_ITEM_POINTER(pamh, ctrl, PAM_REPOSITORY); #endif _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_HOMEDIR); _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_LOGONSCRIPT); _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_LOGONSERVER); _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_PROFILEPATH); _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_NEW_AUTHTOK_REQD); /* Use atoi to get PAM result code */ _PAM_LOG_STATE_DATA_STRING(pamh, ctrl, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH); _PAM_LOG_STATE_DATA_POINTER(pamh, ctrl, PAM_WINBIND_PWD_LAST_SET); } static int _pam_parse(const pam_handle_t *pamh, int flags, int argc, const char **argv, dictionary **result_d) { int ctrl = 0; const char *config_file = NULL; int i; const char **v; dictionary *d = NULL; if (flags & PAM_SILENT) { ctrl |= WINBIND_SILENT; } for (i=argc,v=argv; i-- > 0; ++v) { if (!strncasecmp(*v, "config", strlen("config"))) { ctrl |= WINBIND_CONFIG_FILE; config_file = v[i]; break; } } if (config_file == NULL) { config_file = PAM_WINBIND_CONFIG_FILE; } d = iniparser_load(config_file); if (d == NULL) { goto config_from_pam; } if (iniparser_getboolean(d, "global:debug", False)) { ctrl |= WINBIND_DEBUG_ARG; } if (iniparser_getboolean(d, "global:debug_state", False)) { ctrl |= WINBIND_DEBUG_STATE; } if (iniparser_getboolean(d, "global:cached_login", False)) { ctrl |= WINBIND_CACHED_LOGIN; } if (iniparser_getboolean(d, "global:krb5_auth", False)) { ctrl |= WINBIND_KRB5_AUTH; } if (iniparser_getboolean(d, "global:silent", False)) { ctrl |= WINBIND_SILENT; } if (iniparser_getstr(d, "global:krb5_ccache_type") != NULL) { ctrl |= WINBIND_KRB5_CCACHE_TYPE; } if ((iniparser_getstr(d, "global:require-membership-of") != NULL) || (iniparser_getstr(d, "global:require_membership_of") != NULL)) { ctrl |= WINBIND_REQUIRED_MEMBERSHIP; } if (iniparser_getboolean(d, "global:try_first_pass", False)) { ctrl |= WINBIND_TRY_FIRST_PASS_ARG; } config_from_pam: /* step through arguments */ for (i=argc,v=argv; i-- > 0; ++v) { /* generic options */ if (!strcmp(*v,"debug")) ctrl |= WINBIND_DEBUG_ARG; else if (!strcasecmp(*v, "debug_state")) ctrl |= WINBIND_DEBUG_STATE; else if (!strcasecmp(*v, "use_authtok")) ctrl |= WINBIND_USE_AUTHTOK_ARG; else if (!strcasecmp(*v, "use_first_pass")) ctrl |= WINBIND_USE_FIRST_PASS_ARG; else if (!strcasecmp(*v, "try_first_pass")) ctrl |= WINBIND_TRY_FIRST_PASS_ARG; else if (!strcasecmp(*v, "unknown_ok")) ctrl |= WINBIND_UNKNOWN_OK_ARG; else if (!strncasecmp(*v, "require_membership_of", strlen("require_membership_of"))) ctrl |= WINBIND_REQUIRED_MEMBERSHIP; else if (!strncasecmp(*v, "require-membership-of", strlen("require-membership-of"))) ctrl |= WINBIND_REQUIRED_MEMBERSHIP; else if (!strcasecmp(*v, "krb5_auth")) ctrl |= WINBIND_KRB5_AUTH; else if (!strncasecmp(*v, "krb5_ccache_type", strlen("krb5_ccache_type"))) ctrl |= WINBIND_KRB5_CCACHE_TYPE; else if (!strcasecmp(*v, "cached_login")) ctrl |= WINBIND_CACHED_LOGIN; else { _pam_log(pamh, ctrl, LOG_ERR, "pam_parse: unknown option: %s", *v); return -1; } } if (result_d) { *result_d = d; } else { if (d) { iniparser_freedict(d); } } return ctrl; }; static void _pam_winbind_cleanup_func(pam_handle_t *pamh, void *data, int error_status) { int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL); if (_pam_log_is_debug_state_enabled(ctrl)) { _pam_log_debug(pamh, ctrl, LOG_DEBUG, "[pamh: 0x%08x] CLEAN: cleaning up PAM data 0x%08x (error_status = %d)", (uint32) pamh, (uint32) data, error_status); } SAFE_FREE(data); } static const struct ntstatus_errors { const char *ntstatus_string; const char *error_string; } ntstatus_errors[] = { {"NT_STATUS_OK", "Success"}, {"NT_STATUS_BACKUP_CONTROLLER", "No primary Domain Controler available"}, {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND", "No domain controllers found"}, {"NT_STATUS_NO_LOGON_SERVERS", "No logon servers"}, {"NT_STATUS_PWD_TOO_SHORT", "Password too short"}, {"NT_STATUS_PWD_TOO_RECENT", "The password of this user is too recent to change"}, {"NT_STATUS_PWD_HISTORY_CONFLICT", "Password is already in password history"}, {"NT_STATUS_PASSWORD_EXPIRED", "Your password has expired"}, {"NT_STATUS_PASSWORD_MUST_CHANGE", "You need to change your password now"}, {"NT_STATUS_INVALID_WORKSTATION", "You are not allowed to logon from this workstation"}, {"NT_STATUS_INVALID_LOGON_HOURS", "You are not allowed to logon at this time"}, {"NT_STATUS_ACCOUNT_EXPIRED", "Your account has expired. Please contact your System administrator"}, /* SCNR */ {"NT_STATUS_ACCOUNT_DISABLED", "Your account is disabled. Please contact your System administrator"}, /* SCNR */ {"NT_STATUS_ACCOUNT_LOCKED_OUT", "Your account has been locked. Please contact your System administrator"}, /* SCNR */ {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT", "Invalid Trust Account"}, {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT", "Invalid Trust Account"}, {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT", "Invalid Trust Account"}, {"NT_STATUS_ACCESS_DENIED", "Access is denied"}, {NULL, NULL} }; const char *_get_ntstatus_error_string(const char *nt_status_string) { int i; for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) { if (!strcasecmp(ntstatus_errors[i].ntstatus_string, nt_status_string)) { return ntstatus_errors[i].error_string; } } return NULL; } /* --- authentication management functions --- */ /* Attempt a conversation */ static int converse(pam_handle_t *pamh, int nargs, struct pam_message **message, struct pam_response **response) { int retval; struct pam_conv *conv; retval = _pam_get_item(pamh, PAM_CONV, &conv ); if (retval == PAM_SUCCESS) { retval = conv->conv(nargs, (const struct pam_message **)message, response, conv->appdata_ptr); } return retval; /* propagate error status */ } static int _make_remark(pam_handle_t * pamh, int flags, int type, const char *text) { int retval = PAM_SUCCESS; struct pam_message *pmsg[1], msg[1]; struct pam_response *resp; if (flags & WINBIND_SILENT) { return PAM_SUCCESS; } pmsg[0] = &msg[0]; msg[0].msg = CONST_DISCARD(char *, text); msg[0].msg_style = type; resp = NULL; retval = converse(pamh, 1, pmsg, &resp); if (resp) { _pam_drop_reply(resp, 1); } return retval; } static int _make_remark_v(pam_handle_t * pamh, int flags, int type, const char *format, va_list args) { char *var; int ret; ret = vasprintf(&var, format, args); if (ret < 0) { _pam_log(pamh, 0, LOG_ERR, "memory allocation failure"); return ret; } ret = _make_remark(pamh, flags, type, var); SAFE_FREE(var); return ret; } static int _make_remark_format(pam_handle_t * pamh, int flags, int type, const char *format, ...) PRINTF_ATTRIBUTE(4,5); static int _make_remark_format(pam_handle_t * pamh, int flags, int type, const char *format, ...) { int ret; va_list args; va_start(args, format); ret = _make_remark_v(pamh, flags, type, format, args); va_end(args); return ret; } static int pam_winbind_request(pam_handle_t * pamh, int ctrl, enum winbindd_cmd req_type, struct winbindd_request *request, struct winbindd_response *response) { /* Fill in request and send down pipe */ init_request(request, req_type); if (write_sock(request, sizeof(*request), 0, 1) == -1) { _pam_log(pamh, ctrl, LOG_ERR, "pam_winbind_request: write to socket failed!"); close_sock(); return PAM_SERVICE_ERR; } /* Wait for reply */ if (read_reply(response) == -1) { _pam_log(pamh, ctrl, LOG_ERR, "pam_winbind_request: read from socket failed!"); close_sock(); return PAM_SERVICE_ERR; } /* We are done with the socket - close it and avoid mischeif */ close_sock(); /* Copy reply data from socket */ if (response->result == WINBINDD_OK) { return PAM_SUCCESS; } /* no need to check for pam_error codes for getpwnam() */ switch (req_type) { case WINBINDD_GETPWNAM: case WINBINDD_LOOKUPNAME: if (strlen(response->data.auth.nt_status_string) > 0) { _pam_log(pamh, ctrl, LOG_ERR, "request failed, NT error was %s", response->data.auth.nt_status_string); } else { _pam_log(pamh, ctrl, LOG_ERR, "request failed"); } return PAM_USER_UNKNOWN; default: break; } if (response->data.auth.pam_error != PAM_SUCCESS) { _pam_log(pamh, ctrl, LOG_ERR, "request failed: %s, PAM error was %s (%d), NT error was %s", response->data.auth.error_string, pam_strerror(pamh, response->data.auth.pam_error), response->data.auth.pam_error, response->data.auth.nt_status_string); return response->data.auth.pam_error; } _pam_log(pamh, ctrl, LOG_ERR, "request failed, but PAM error 0!"); return PAM_SERVICE_ERR; } static int pam_winbind_request_log(pam_handle_t * pamh, int ctrl, enum winbindd_cmd req_type, struct winbindd_request *request, struct winbindd_response *response, const char *user) { int retval; retval = pam_winbind_request(pamh, ctrl, req_type, request, response); switch (retval) { case PAM_AUTH_ERR: /* incorrect password */ _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' denied access (incorrect password or invalid membership)", user); return retval; case PAM_ACCT_EXPIRED: /* account expired */ _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' account expired", user); return retval; case PAM_AUTHTOK_EXPIRED: /* password expired */ _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' password expired", user); return retval; case PAM_NEW_AUTHTOK_REQD: /* new password required */ _pam_log(pamh, ctrl, LOG_WARNING, "user '%s' new password required", user); return retval; case PAM_USER_UNKNOWN: /* the user does not exist */ _pam_log_debug(pamh, ctrl, LOG_NOTICE, "user '%s' not found", user); if (ctrl & WINBIND_UNKNOWN_OK_ARG) { return PAM_IGNORE; } return retval; case PAM_SUCCESS: /* Otherwise, the authentication looked good */ switch (req_type) { case WINBINDD_INFO: break; case WINBINDD_PAM_AUTH: _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' granted access", user); break; case WINBINDD_PAM_CHAUTHTOK: _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' password changed", user); break; default: _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' OK", user); break; } return retval; default: /* we don't know anything about this return value */ _pam_log(pamh, ctrl, LOG_ERR, "internal module error (retval = %d, user = '%s')", retval, user); return retval; } } /** * send a password expiry message if required * * @param pamh PAM handle * @param ctrl PAM winbind options. * @param next_change expected (calculated) next expiry date. * @param already_expired pointer to a boolean to indicate if the password is * already expired. * * @return boolean Returns True if message has been sent, False if not. */ static BOOL _pam_send_password_expiry_message(pam_handle_t *pamh, int ctrl, time_t next_change, time_t now, BOOL *already_expired) { int days = 0; struct tm tm_now, tm_next_change; if (already_expired) { *already_expired = False; } if (next_change <= now) { PAM_WB_REMARK_DIRECT(pamh, ctrl, "NT_STATUS_PASSWORD_EXPIRED"); if (already_expired) { *already_expired = True; } return True; } if ((next_change < 0) || (next_change > now + DAYS_TO_WARN_BEFORE_PWD_EXPIRES * SECONDS_PER_DAY)) { return False; } if ((localtime_r(&now, &tm_now) == NULL) || (localtime_r(&next_change, &tm_next_change) == NULL)) { return False; } days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) - (tm_now.tm_yday+tm_now.tm_year*365); if (days == 0) { _make_remark(pamh, ctrl, PAM_TEXT_INFO, "Your password expires today"); return True; } if (days > 0 && days < DAYS_TO_WARN_BEFORE_PWD_EXPIRES) { _make_remark_format(pamh, ctrl, PAM_TEXT_INFO, "Your password will expire in %d %s", days, (days > 1) ? "days":"day"); return True; } return False; } /** * Send a warning if the password expires in the near future * * @param pamh PAM handle * @param ctrl PAM winbind options. * @param response The full authentication response structure. * @param already_expired boolean, is the pwd already expired? * * @return void. */ static void _pam_warn_password_expiry(pam_handle_t *pamh, int flags, const struct winbindd_response *response, BOOL *already_expired) { time_t now = time(NULL); time_t next_change = 0; if (already_expired) { *already_expired = False; } /* accounts with ACB_PWNOEXP set never receive a warning */ if (response->data.auth.info3.acct_flags & ACB_PWNOEXP) { return; } /* no point in sending a warning if this is a grace logon */ if (PAM_WB_GRACE_LOGON(response->data.auth.info3.user_flgs)) { return; } /* check if the info3 must change timestamp has been set */ next_change = response->data.auth.info3.pass_must_change_time; if (_pam_send_password_expiry_message(pamh, flags, next_change, now, already_expired)) { return; } /* now check for the global password policy */ /* good catch from Ralf Haferkamp: an expiry of "never" is translated * to -1 */ if (response->data.auth.policy.expire <= 0) { return; } next_change = response->data.auth.info3.pass_last_set_time + response->data.auth.policy.expire; if (_pam_send_password_expiry_message(pamh, flags, next_change, now, already_expired)) { return; } /* no warning sent */ } #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0) static BOOL safe_append_string(char *dest, const char *src, int dest_buffer_size) /** * Append a string, making sure not to overflow and to always return a NULL-terminated * string. * * @param dest Destination string buffer (must already be NULL-terminated). * @param src Source string buffer. * @param dest_buffer_size Size of dest buffer in bytes. * * @return False if dest buffer is not big enough (no bytes copied), True on success. */ { int dest_length = strlen(dest); int src_length = strlen(src); if ( dest_length + src_length + 1 > dest_buffer_size ) { return False; } memcpy(dest + dest_length, src, src_length + 1); return True; } static BOOL winbind_name_to_sid_string(pam_handle_t *pamh, int ctrl, const char *user, const char *name, char *sid_list_buffer, int sid_list_buffer_size) /** * Convert a names into a SID string, appending it to a buffer. * * @param pamh PAM handle * @param ctrl PAM winbind options. * @param user User in PAM request. * @param name Name to convert. * @param sid_list_buffer Where to append the string sid. * @param sid_list_buffer Size of sid_list_buffer (in bytes). * * @return False on failure, True on success. */ { const char* sid_string; struct winbindd_response sid_response; /* lookup name? */ if (IS_SID_STRING(name)) { sid_string = name; } else { struct winbindd_request sid_request; ZERO_STRUCT(sid_request); ZERO_STRUCT(sid_response); _pam_log_debug(pamh, ctrl, LOG_DEBUG, "no sid given, looking up: %s\n", name); /* fortunatly winbindd can handle non-separated names */ strncpy(sid_request.data.name.name, name, sizeof(sid_request.data.name.name) - 1); if (pam_winbind_request_log(pamh, ctrl, WINBINDD_LOOKUPNAME, &sid_request, &sid_response, user)) { _pam_log(pamh, ctrl, LOG_INFO, "could not lookup name: %s\n", name); return False; } sid_string = sid_response.data.sid.sid; } if (!safe_append_string(sid_list_buffer, sid_string, sid_list_buffer_size)) { return False; } return True; } static BOOL winbind_name_list_to_sid_string_list(pam_handle_t *pamh, int ctrl, const char *user, const char *name_list, char *sid_list_buffer, int sid_list_buffer_size) /** * Convert a list of names into a list of sids. * * @param pamh PAM handle * @param ctrl PAM winbind options. * @param user User in PAM request. * @param name_list List of names or string sids, separated by commas. * @param sid_list_buffer Where to put the list of string sids. * @param sid_list_buffer Size of sid_list_buffer (in bytes). * * @return False on failure, True on success. */ { BOOL result = False; char *current_name = NULL; const char *search_location; const char *comma; if ( sid_list_buffer_size > 0 ) { sid_list_buffer[0] = 0; } search_location = name_list; while ( (comma = strstr(search_location, ",")) != NULL ) { current_name = strndup(search_location, comma - search_location); if (NULL == current_name) { goto out; } if (!winbind_name_to_sid_string(pamh, ctrl, user, current_name, sid_list_buffer, sid_list_buffer_size)) { goto out; } SAFE_FREE(current_name); if (!safe_append_string(sid_list_buffer, ",", sid_list_buffer_size)) { goto out; } search_location = comma + 1; } if (!winbind_name_to_sid_string(pamh, ctrl, user, search_location, sid_list_buffer, sid_list_buffer_size)) { goto out; } result = True; out: SAFE_FREE(current_name); return result; } /** * put krb5ccname variable into environment * * @param pamh PAM handle * @param ctrl PAM winbind options. * @param krb5ccname env variable retrieved from winbindd. * * @return void. */ static void _pam_setup_krb5_env(pam_handle_t *pamh, int ctrl, const char *krb5ccname) { char var[PATH_MAX]; int ret; if (off(ctrl, WINBIND_KRB5_AUTH)) { return; } if (!krb5ccname || (strlen(krb5ccname) == 0)) { return; } _pam_log_debug(pamh, ctrl, LOG_DEBUG, "request returned KRB5CCNAME: %s", krb5ccname); if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) { return; } ret = pam_putenv(pamh, var); if (ret) { _pam_log(pamh, ctrl, LOG_ERR, "failed to set KRB5CCNAME to %s: %s", var, pam_strerror(pamh, ret)); } } /** * Set string into the PAM stack. * * @param pamh PAM handle * @param ctrl PAM winbind options. * @param data_name Key name for pam_set_data. * @param value String value. * * @return void. */ static void _pam_set_data_string(pam_handle_t *pamh, int ctrl, const char *data_name, const char *value) { int ret; if ( !data_name || !value || (strlen(data_name) == 0) || (strlen(value) == 0) ) { return; } ret = pam_set_data(pamh, data_name, (void *)strdup(value), _pam_winbind_cleanup_func); if (ret) { _pam_log_debug(pamh, ctrl, LOG_DEBUG, "Could not set data %s: %s\n", data_name, pam_strerror(pamh, ret)); } } /** * Set info3 strings into the PAM stack. * * @param pamh PAM handle * @param ctrl PAM winbind options. * @param data_name Key name for pam_set_data. * @param value String value. * * @return void. */ static void _pam_set_data_info3(pam_handle_t *pamh, int ctrl, struct winbindd_response *response) { _pam_set_data_string(pamh, ctrl, PAM_WINBIND_HOMEDIR, response->data.auth.info3.home_dir); _pam_set_data_string(pamh, ctrl, PAM_WINBIND_LOGONSCRIPT, response->data.auth.info3.logon_script); _pam_set_data_string(pamh, ctrl, PAM_WINBIND_LOGONSERVER, response->data.auth.info3.logon_srv); _pam_set_data_string(pamh, ctrl, PAM_WINBIND_PROFILEPATH, response->data.auth.info3.profile_path); } /** * Free info3 strings in the PAM stack. * * @param pamh PAM handle * * @return void. */ static void _pam_free_data_info3(pam_handle_t *pamh) { pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL); pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL); pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL); pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL); } /** * Send PAM_ERROR_MSG for cached or grace logons. * * @param pamh PAM handle * @param ctrl PAM winbind options. * @param username User in PAM request. * @param info3_user_flgs Info3 flags containing logon type bits. * * @return void. */ static void _pam_warn_logon_type(pam_handle_t *pamh, int ctrl, const char *username, uint32 info3_user_flgs) { /* inform about logon type */ if (PAM_WB_GRACE_LOGON(info3_user_flgs)) { _make_remark(pamh, ctrl, PAM_ERROR_MSG, "Grace login. Please change your password as soon you're online again"); _pam_log_debug(pamh, ctrl, LOG_DEBUG, "User %s logged on using grace logon\n", username); } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) { _make_remark(pamh, ctrl, PAM_ERROR_MSG, "Logging on using cached account. Network resources can be unavailable"); _pam_log_debug(pamh, ctrl, LOG_DEBUG, "User %s logged on using cached account\n", username); } } /** * Compose Password Restriction String for a PAM_ERROR_MSG conversation. * * @param response The struct winbindd_response. * * @return string (caller needs to free). */ static char *_pam_compose_pwd_restriction_string(struct winbindd_response *response) { char *str = NULL; size_t offset = 0, ret = 0, str_size = 1024; str = (char *)malloc(str_size); if (!str) { return NULL; } memset(str, '\0', str_size); offset = snprintf(str, str_size, "Your password "); if (offset == -1) { goto failed; } if (response->data.auth.policy.min_length_password > 0) { ret = snprintf(str+offset, str_size-offset, "must be at least %d characters; ", response->data.auth.policy.min_length_password); if (ret == -1) { goto failed; } offset += ret; } if (response->data.auth.policy.password_history > 0) { ret = snprintf(str+offset, str_size-offset, "cannot repeat any of your previous %d passwords; ", response->data.auth.policy.password_history); if (ret == -1) { goto failed; } offset += ret; } if (response->data.auth.policy.password_properties & DOMAIN_PASSWORD_COMPLEX) { ret = snprintf(str+offset, str_size-offset, "must contain capitals, numerals or punctuation; " "and cannot contain your account or full name; "); if (ret == -1) { goto failed; } offset += ret; } ret = snprintf(str+offset, str_size-offset, "Please type a different password. " "Type a password which meets these requirements in both text boxes."); if (ret == -1) { goto failed; } return str; failed: SAFE_FREE(str); return NULL; } /* talk to winbindd */ static int winbind_auth_request(pam_handle_t * pamh, int ctrl, const char *user, const char *pass, const char *member, const char *cctype, struct winbindd_response *p_response, time_t *pwd_last_set, char **user_ret) { struct winbindd_request request; struct winbindd_response response; int ret; BOOL already_expired = False; ZERO_STRUCT(request); ZERO_STRUCT(response); if (pwd_last_set) { *pwd_last_set = 0; } strncpy(request.data.auth.user, user, sizeof(request.data.auth.user)-1); strncpy(request.data.auth.pass, pass, sizeof(request.data.auth.pass)-1); request.data.auth.krb5_cc_type[0] = '\0'; request.data.auth.uid = -1; request.flags = WBFLAG_PAM_INFO3_TEXT | WBFLAG_PAM_CONTACT_TRUSTDOM; if (ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) { struct passwd *pwd = NULL; pwd = getpwnam(user); if (pwd == NULL) { return PAM_USER_UNKNOWN; } request.data.auth.uid = pwd->pw_uid; } if (ctrl & WINBIND_KRB5_AUTH) { _pam_log_debug(pamh, ctrl, LOG_DEBUG, "enabling krb5 login flag\n"); request.flags |= WBFLAG_PAM_KRB5 | WBFLAG_PAM_FALLBACK_AFTER_KRB5; } if (ctrl & WINBIND_CACHED_LOGIN) { _pam_log_debug(pamh, ctrl, LOG_DEBUG, "enabling cached login flag\n"); request.flags |= WBFLAG_PAM_CACHED_LOGIN; } if (user_ret) { *user_ret = NULL; request.flags |= WBFLAG_PAM_UNIX_NAME; } if (cctype != NULL) { strncpy(request.data.auth.krb5_cc_type, cctype, sizeof(request.data.auth.krb5_cc_type) - 1); _pam_log_debug(pamh, ctrl, LOG_DEBUG, "enabling request for a %s krb5 ccache\n", cctype); } request.data.auth.require_membership_of_sid[0] = '\0'; if (member != NULL) { if (!winbind_name_list_to_sid_string_list(pamh, ctrl, user, member, request.data.auth.require_membership_of_sid, sizeof(request.data.auth.require_membership_of_sid))) { _pam_log_debug(pamh, ctrl, LOG_ERR, "failed to serialize membership of sid \"%s\"\n", member); return PAM_AUTH_ERR; } } ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_AUTH, &request, &response, user); if (pwd_last_set) { *pwd_last_set = response.data.auth.info3.pass_last_set_time; } if (p_response) { /* We want to process the response in the caller. */ *p_response = response; return ret; } if (ret) { PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_PASSWORD_EXPIRED"); PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_PASSWORD_MUST_CHANGE"); PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_INVALID_WORKSTATION"); PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_INVALID_LOGON_HOURS"); PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_ACCOUNT_EXPIRED"); PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_ACCOUNT_DISABLED"); PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_ACCOUNT_LOCKED_OUT"); PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT"); PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT"); PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT"); PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND"); PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_NO_LOGON_SERVERS"); PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_WRONG_PASSWORD"); PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_ACCESS_DENIED"); } if (ret == PAM_SUCCESS) { /* warn a user if the password is about to expire soon */ _pam_warn_password_expiry(pamh, ctrl, &response, &already_expired); if (already_expired == True) { _pam_log_debug(pamh, ctrl, LOG_DEBUG, "Password has expired " "(Password was last set: %lld, the policy says " "it should expire here %lld (now it's: %lu))\n", response.data.auth.info3.pass_last_set_time, response.data.auth.info3.pass_last_set_time + response.data.auth.policy.expire, time(NULL)); return PAM_AUTHTOK_EXPIRED; } /* inform about logon type */ _pam_warn_logon_type(pamh, ctrl, user, response.data.auth.info3.user_flgs); /* set some info3 info for other modules in the stack */ _pam_set_data_info3(pamh, ctrl, &response); /* put krb5ccname into env */ _pam_setup_krb5_env(pamh, ctrl, response.data.auth.krb5ccname); /* If winbindd returned a username, return the pointer to it here. */ if (user_ret && response.extra_data.data) { /* We have to trust it's a null terminated string. */ *user_ret = (char *)response.extra_data.data; } } return ret; } /* talk to winbindd */ static int winbind_chauthtok_request(pam_handle_t * pamh, int ctrl, const char *user, const char *oldpass, const char *newpass, time_t pwd_last_set) { struct winbindd_request request; struct winbindd_response response; int ret; ZERO_STRUCT(request); ZERO_STRUCT(response); if (request.data.chauthtok.user == NULL) return -2; strncpy(request.data.chauthtok.user, user, sizeof(request.data.chauthtok.user) - 1); if (oldpass != NULL) { strncpy(request.data.chauthtok.oldpass, oldpass, sizeof(request.data.chauthtok.oldpass) - 1); } else { request.data.chauthtok.oldpass[0] = '\0'; } if (newpass != NULL) { strncpy(request.data.chauthtok.newpass, newpass, sizeof(request.data.chauthtok.newpass) - 1); } else { request.data.chauthtok.newpass[0] = '\0'; } if (ctrl & WINBIND_KRB5_AUTH) { request.flags = WBFLAG_PAM_KRB5 | WBFLAG_PAM_CONTACT_TRUSTDOM; } ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_CHAUTHTOK, &request, &response, user); if (ret == PAM_SUCCESS) { return ret; } PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_BACKUP_CONTROLLER"); PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND"); PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_NO_LOGON_SERVERS"); PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_ACCESS_DENIED"); /* TODO: tell the min pwd length ? */ PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_PWD_TOO_SHORT"); /* TODO: tell the minage ? */ PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_PWD_TOO_RECENT"); /* TODO: tell the history length ? */ PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, ctrl, response, "NT_STATUS_PWD_HISTORY_CONFLICT"); if (!strcasecmp(response.data.auth.nt_status_string, "NT_STATUS_PASSWORD_RESTRICTION")) { char *pwd_restriction_string = NULL; /* FIXME: avoid to send multiple PAM messages after another */ switch (response.data.auth.reject_reason) { case -1: break; case REJECT_REASON_OTHER: if ((response.data.auth.policy.min_passwordage > 0) && (pwd_last_set + response.data.auth.policy.min_passwordage > time(NULL))) { PAM_WB_REMARK_DIRECT(pamh, ctrl, "NT_STATUS_PWD_TOO_RECENT"); } break; case REJECT_REASON_TOO_SHORT: PAM_WB_REMARK_DIRECT(pamh, ctrl, "NT_STATUS_PWD_TOO_SHORT"); break; case REJECT_REASON_IN_HISTORY: PAM_WB_REMARK_DIRECT(pamh, ctrl, "NT_STATUS_PWD_HISTORY_CONFLICT"); break; case REJECT_REASON_NOT_COMPLEX: _make_remark(pamh, ctrl, PAM_ERROR_MSG, "Password does not meet complexity requirements"); break; default: _pam_log_debug(pamh, ctrl, LOG_DEBUG, "unknown password change reject reason: %d", response.data.auth.reject_reason); break; } pwd_restriction_string = _pam_compose_pwd_restriction_string(&response); if (pwd_restriction_string) { _make_remark(pamh, ctrl, PAM_ERROR_MSG, pwd_restriction_string); SAFE_FREE(pwd_restriction_string); } } return ret; } /* * Checks if a user has an account * * return values: * 1 = User not found * 0 = OK * -1 = System error */ static int valid_user(pam_handle_t *pamh, int ctrl, const char *user) { /* check not only if the user is available over NSS calls, also make * sure it's really a winbind user, this is important when stacking PAM * modules in the 'account' or 'password' facility. */ struct passwd *pwd = NULL; struct winbindd_request request; struct winbindd_response response; int ret; ZERO_STRUCT(request); ZERO_STRUCT(response); pwd = getpwnam(user); if (pwd == NULL) { return 1; } strncpy(request.data.username, user, sizeof(request.data.username) - 1); ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_GETPWNAM, &request, &response, user); switch (ret) { case PAM_USER_UNKNOWN: return 1; case PAM_SUCCESS: return 0; default: break; } return -1; } static char *_pam_delete(register char *xx) { _pam_overwrite(xx); _pam_drop(xx); return NULL; } /* * obtain a password from the user */ static int _winbind_read_password(pam_handle_t * pamh, unsigned int ctrl, const char *comment, const char *prompt1, const char *prompt2, const char **pass) { int authtok_flag; int retval; const char *item; char *token; _pam_log(pamh, ctrl, LOG_DEBUG, "getting password (0x%08x)", ctrl); /* * make sure nothing inappropriate gets returned */ *pass = token = NULL; /* * which authentication token are we getting? */ authtok_flag = on(WINBIND__OLD_PASSWORD, ctrl) ? PAM_OLDAUTHTOK : PAM_AUTHTOK; /* * should we obtain the password from a PAM item ? */ if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) || on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) { retval = _pam_get_item(pamh, authtok_flag, &item); if (retval != PAM_SUCCESS) { /* very strange. */ _pam_log(pamh, ctrl, LOG_ALERT, "pam_get_item returned error to unix-read-password" ); return retval; } else if (item != NULL) { /* we have a password! */ *pass = item; item = NULL; _pam_log(pamh, ctrl, LOG_DEBUG, "pam_get_item returned a password"); return PAM_SUCCESS; } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) { return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */ } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl) && off(WINBIND__OLD_PASSWORD, ctrl)) { return PAM_AUTHTOK_RECOVER_ERR; } } /* * getting here implies we will have to get the password from the * user directly. */ { struct pam_message msg[3], *pmsg[3]; struct pam_response *resp; int i, replies; /* prepare to converse */ if (comment != NULL && off(ctrl, WINBIND_SILENT)) { pmsg[0] = &msg[0]; msg[0].msg_style = PAM_TEXT_INFO; msg[0].msg = CONST_DISCARD(char *, comment); i = 1; } else { i = 0; } pmsg[i] = &msg[i]; msg[i].msg_style = PAM_PROMPT_ECHO_OFF; msg[i++].msg = CONST_DISCARD(char *, prompt1); replies = 1; if (prompt2 != NULL) { pmsg[i] = &msg[i]; msg[i].msg_style = PAM_PROMPT_ECHO_OFF; msg[i++].msg = CONST_DISCARD(char *, prompt2); ++replies; } /* so call the conversation expecting i responses */ resp = NULL; retval = converse(pamh, i, pmsg, &resp); if (resp != NULL) { /* interpret the response */ if (retval == PAM_SUCCESS) { /* a good conversation */ token = x_strdup(resp[i - replies].resp); if (token != NULL) { if (replies == 2) { /* verify that password entered correctly */ if (!resp[i - 1].resp || strcmp(token, resp[i - 1].resp)) { _pam_delete(token); /* mistyped */ retval = PAM_AUTHTOK_RECOVER_ERR; _make_remark(pamh, ctrl, PAM_ERROR_MSG, MISTYPED_PASS); } } } else { _pam_log(pamh, ctrl, LOG_NOTICE, "could not recover authentication token"); retval = PAM_AUTHTOK_RECOVER_ERR; } } /* * tidy up the conversation (resp_retcode) is ignored * -- what is it for anyway? AGM */ _pam_drop_reply(resp, i); } else { retval = (retval == PAM_SUCCESS) ? PAM_AUTHTOK_RECOVER_ERR : retval; } } if (retval != PAM_SUCCESS) { _pam_log_debug(pamh, ctrl, LOG_DEBUG, "unable to obtain a password"); return retval; } /* 'token' is the entered password */ /* we store this password as an item */ retval = pam_set_item(pamh, authtok_flag, token); _pam_delete(token); /* clean it up */ if (retval != PAM_SUCCESS || (retval = _pam_get_item(pamh, authtok_flag, &item)) != PAM_SUCCESS) { _pam_log(pamh, ctrl, LOG_CRIT, "error manipulating password"); return retval; } *pass = item; item = NULL; /* break link to password */ return PAM_SUCCESS; } const char *get_conf_item_string(const pam_handle_t *pamh, int argc, const char **argv, int ctrl, dictionary *d, const char *item, int config_flag) { int i = 0; const char *parm_opt = NULL; char *key = NULL; if (!(ctrl & config_flag)) { goto out; } /* let the pam opt take precedence over the pam_winbind.conf option */ if (d != NULL) { if (!asprintf(&key, "global:%s", item)) { goto out; } parm_opt = iniparser_getstr(d, key); SAFE_FREE(key); } for ( i=0; ipw_name ); } } #endif if ( !real_username ) { /* Just making a copy of the username we got from PAM */ if ( (real_username = strdup( username )) == NULL ) { _pam_log_debug(pamh, ctrl, LOG_DEBUG, "memory allocation failure when copying username"); retval = PAM_SERVICE_ERR; goto out; } } retval = _winbind_read_password(pamh, ctrl, NULL, "Password: ", NULL, &password); if (retval != PAM_SUCCESS) { _pam_log(pamh, ctrl, LOG_ERR, "Could not retrieve user's password"); retval = PAM_AUTHTOK_ERR; goto out; } /* Let's not give too much away in the log file */ #ifdef DEBUG_PASSWORD _pam_log_debug(pamh, ctrl, LOG_INFO, "Verify user '%s' with password '%s'", real_username, password); #else _pam_log_debug(pamh, ctrl, LOG_INFO, "Verify user '%s'", real_username); #endif member = get_member_from_config(pamh, argc, argv, ctrl, d); cctype = get_krb5_cc_type_from_config(pamh, argc, argv, ctrl, d); /* Now use the username to look up password */ retval = winbind_auth_request(pamh, ctrl, username, password, member, cctype, NULL, NULL, &username_ret); if (retval == PAM_NEW_AUTHTOK_REQD || retval == PAM_AUTHTOK_EXPIRED) { char *new_authtok_required_during_auth = NULL; if (!asprintf(&new_authtok_required, "%d", retval)) { retval = PAM_BUF_ERR; goto out; } pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, new_authtok_required, _pam_winbind_cleanup_func); retval = PAM_SUCCESS; if (!asprintf(&new_authtok_required_during_auth, "%d", True)) { retval = PAM_BUF_ERR; goto out; } pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH, new_authtok_required_during_auth, _pam_winbind_cleanup_func); goto out; } out: if (username_ret) { pam_set_item (pamh, PAM_USER, username_ret); _pam_log_debug(pamh, ctrl, LOG_INFO, "Returned user was '%s'", username_ret); free(username_ret); } if ( real_username ) { free( real_username ); } if (d) { iniparser_freedict(d); } if (!new_authtok_required) { pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL); } if (retval != PAM_SUCCESS) { _pam_free_data_info3(pamh); } _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", pamh, ctrl, retval); return retval; } PAM_EXTERN int pam_sm_setcred(pam_handle_t *pamh, int flags, int argc, const char **argv) { int ret = PAM_SYSTEM_ERR; dictionary *d = NULL; /* parse arguments */ int ctrl = _pam_parse(pamh, flags, argc, argv, &d); if (ctrl == -1) { ret = PAM_SYSTEM_ERR; goto out; } _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", pamh, ctrl, flags); switch (flags & ~PAM_SILENT) { case PAM_DELETE_CRED: ret = pam_sm_close_session(pamh, flags, argc, argv); break; case PAM_REFRESH_CRED: _pam_log_debug(pamh, ctrl, LOG_WARNING, "PAM_REFRESH_CRED not implemented"); ret = PAM_SUCCESS; break; case PAM_REINITIALIZE_CRED: _pam_log_debug(pamh, ctrl, LOG_WARNING, "PAM_REINITIALIZE_CRED not implemented"); ret = PAM_SUCCESS; break; case PAM_ESTABLISH_CRED: _pam_log_debug(pamh, ctrl, LOG_WARNING, "PAM_ESTABLISH_CRED not implemented"); ret = PAM_SUCCESS; break; default: ret = PAM_SYSTEM_ERR; break; } out: if (d) { iniparser_freedict(d); } _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", pamh, ctrl, ret); return ret; } /* * Account management. We want to verify that the account exists * before returning PAM_SUCCESS */ PAM_EXTERN int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc, const char **argv) { const char *username; int ret = PAM_USER_UNKNOWN; void *tmp = NULL; dictionary *d = NULL; /* parse arguments */ int ctrl = _pam_parse(pamh, flags, argc, argv, &d); if (ctrl == -1) { return PAM_SYSTEM_ERR; } _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", pamh, ctrl, flags); /* Get the username */ ret = pam_get_user(pamh, &username, NULL); if ((ret != PAM_SUCCESS) || (!username)) { _pam_log_debug(pamh, ctrl, LOG_DEBUG,"can not get the username"); ret = PAM_SERVICE_ERR; goto out; } /* Verify the username */ ret = valid_user(pamh, ctrl, username); switch (ret) { case -1: /* some sort of system error. The log was already printed */ ret = PAM_SERVICE_ERR; goto out; case 1: /* the user does not exist */ _pam_log_debug(pamh, ctrl, LOG_NOTICE, "user '%s' not found", username); if (ctrl & WINBIND_UNKNOWN_OK_ARG) { ret = PAM_IGNORE; goto out; } ret = PAM_USER_UNKNOWN; goto out; case 0: pam_get_data( pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, (const void **)&tmp); if (tmp != NULL) { ret = atoi((const char *)tmp); switch (ret) { case PAM_AUTHTOK_EXPIRED: /* fall through, since new token is required in this case */ case PAM_NEW_AUTHTOK_REQD: _pam_log(pamh, ctrl, LOG_WARNING, "pam_sm_acct_mgmt success but %s is set", PAM_WINBIND_NEW_AUTHTOK_REQD); _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' needs new password", username); /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */ ret = PAM_NEW_AUTHTOK_REQD; goto out; default: _pam_log(pamh, ctrl, LOG_WARNING, "pam_sm_acct_mgmt success"); _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' granted access", username); ret = PAM_SUCCESS; goto out; } } /* Otherwise, the authentication looked good */ _pam_log(pamh, ctrl, LOG_NOTICE, "user '%s' granted access", username); ret = PAM_SUCCESS; goto out; default: /* we don't know anything about this return value */ _pam_log(pamh, ctrl, LOG_ERR, "internal module error (ret = %d, user = '%s')", ret, username); ret = PAM_SERVICE_ERR; goto out; } /* should not be reached */ ret = PAM_IGNORE; out: if (d) { iniparser_freedict(d); } _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", pamh, ctrl, ret); return ret; } PAM_EXTERN int pam_sm_open_session(pam_handle_t *pamh, int flags, int argc, const char **argv) { int ret = PAM_SYSTEM_ERR; dictionary *d = NULL; /* parse arguments */ int ctrl = _pam_parse(pamh, flags, argc, argv, &d); if (ctrl == -1) { ret = PAM_SYSTEM_ERR; goto out; } _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", pamh, ctrl, flags); ret = PAM_SUCCESS; out: if (d) { iniparser_freedict(d); } _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", pamh, ctrl, ret); return ret; } PAM_EXTERN int pam_sm_close_session(pam_handle_t *pamh, int flags, int argc, const char **argv) { dictionary *d = NULL; int retval = PAM_SUCCESS; /* parse arguments */ int ctrl = _pam_parse(pamh, flags, argc, argv, &d); if (ctrl == -1) { retval = PAM_SYSTEM_ERR; goto out; } _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", pamh, ctrl, flags); if (!(flags & PAM_DELETE_CRED)) { retval = PAM_SUCCESS; goto out; } if (ctrl & WINBIND_KRB5_AUTH) { /* destroy the ccache here */ struct winbindd_request request; struct winbindd_response response; const char *user; const char *ccname = NULL; struct passwd *pwd = NULL; ZERO_STRUCT(request); ZERO_STRUCT(response); retval = pam_get_user(pamh, &user, "Username: "); if (retval) { _pam_log(pamh, ctrl, LOG_ERR, "could not identify user"); goto out; } if (user == NULL) { _pam_log(pamh, ctrl, LOG_ERR, "username was NULL!"); retval = PAM_USER_UNKNOWN; goto out; } _pam_log_debug(pamh, ctrl, LOG_DEBUG, "username [%s] obtained", user); ccname = pam_getenv(pamh, "KRB5CCNAME"); if (ccname == NULL) { _pam_log_debug(pamh, ctrl, LOG_DEBUG, "user has no KRB5CCNAME environment"); } strncpy(request.data.logoff.user, user, sizeof(request.data.logoff.user) - 1); if (ccname) { strncpy(request.data.logoff.krb5ccname, ccname, sizeof(request.data.logoff.krb5ccname) - 1); } pwd = getpwnam(user); if (pwd == NULL) { retval = PAM_USER_UNKNOWN; goto out; } request.data.logoff.uid = pwd->pw_uid; request.flags = WBFLAG_PAM_KRB5 | WBFLAG_PAM_CONTACT_TRUSTDOM; retval = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_LOGOFF, &request, &response, user); } out: if (d) { iniparser_freedict(d); } _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", pamh, ctrl, retval); return retval; } /** * evaluate whether we need to re-authenticate with kerberos after a password change * * @param pamh PAM handle * @param ctrl PAM winbind options. * @param user The username * * @return boolean Returns True if required, False if not. */ static BOOL _pam_require_krb5_auth_after_chauthtok(pam_handle_t *pamh, int ctrl, const char *user) { /* Make sure that we only do this if * a) the chauthtok got initiated during a logon attempt (authenticate->acct_mgmt->chauthtok) * b) any later password change via the "passwd" command if done by the user itself */ char *new_authtok_reqd_during_auth = NULL; struct passwd *pwd = NULL; if (!(ctrl & WINBIND_KRB5_AUTH)) { return False; } _pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH, &new_authtok_reqd_during_auth); pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH, NULL, NULL); if (new_authtok_reqd_during_auth) { return True; } pwd = getpwnam(user); if (!pwd) { return False; } if (getuid() == pwd->pw_uid) { return True; } return False; } PAM_EXTERN int pam_sm_chauthtok(pam_handle_t * pamh, int flags, int argc, const char **argv) { unsigned int lctrl; int ret; unsigned int ctrl; /* */ const char *user; char *pass_old, *pass_new; /* */ char *Announce; int retry = 0; dictionary *d = NULL; char *username_ret = NULL; struct winbindd_response response; ZERO_STRUCT(response); ctrl = _pam_parse(pamh, flags, argc, argv, &d); if (ctrl == -1) { ret = PAM_SYSTEM_ERR; goto out; } _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", pamh, ctrl, flags); /* clearing offline bit for the auth in the password change */ ctrl &= ~WINBIND_CACHED_LOGIN; /* * First get the name of a user */ ret = pam_get_user(pamh, &user, "Username: "); if (ret) { _pam_log(pamh, ctrl, LOG_ERR, "password - could not identify user"); goto out; } if (user == NULL) { _pam_log(pamh, ctrl, LOG_ERR, "username was NULL!"); ret = PAM_USER_UNKNOWN; goto out; } _pam_log_debug(pamh, ctrl, LOG_DEBUG, "username [%s] obtained", user); /* check if this is really a user in winbindd, not only in NSS */ ret = valid_user(pamh, ctrl, user); switch (ret) { case 1: ret = PAM_USER_UNKNOWN; goto out; case -1: ret = PAM_SYSTEM_ERR; goto out; default: break; } /* * obtain and verify the current password (OLDAUTHTOK) for * the user. */ if (flags & PAM_PRELIM_CHECK) { time_t pwdlastset_prelim = 0; /* instruct user what is happening */ #define greeting "Changing password for " Announce = (char *) malloc(sizeof(greeting) + strlen(user)); if (Announce == NULL) { _pam_log(pamh, ctrl, LOG_CRIT, "password - out of memory"); ret = PAM_BUF_ERR; goto out; } (void) strcpy(Announce, greeting); (void) strcpy(Announce + sizeof(greeting) - 1, user); #undef greeting lctrl = ctrl | WINBIND__OLD_PASSWORD; ret = _winbind_read_password(pamh, lctrl, Announce, "(current) NT password: ", NULL, (const char **) &pass_old); if (ret != PAM_SUCCESS) { _pam_log(pamh, ctrl, LOG_NOTICE, "password - (old) token not obtained"); goto out; } /* verify that this is the password for this user */ ret = winbind_auth_request(pamh, ctrl, user, pass_old, NULL, NULL, &response, &pwdlastset_prelim, NULL); if (ret != PAM_ACCT_EXPIRED && ret != PAM_AUTHTOK_EXPIRED && ret != PAM_NEW_AUTHTOK_REQD && ret != PAM_SUCCESS) { pass_old = NULL; goto out; } pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET, (void *)pwdlastset_prelim, NULL); ret = pam_set_item(pamh, PAM_OLDAUTHTOK, (const void *) pass_old); pass_old = NULL; if (ret != PAM_SUCCESS) { _pam_log(pamh, ctrl, LOG_CRIT, "failed to set PAM_OLDAUTHTOK"); } } else if (flags & PAM_UPDATE_AUTHTOK) { time_t pwdlastset_update = 0; /* * obtain the proposed password */ /* * get the old token back. */ ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old); if (ret != PAM_SUCCESS) { _pam_log(pamh, ctrl, LOG_NOTICE, "user not authenticated"); goto out; } lctrl = ctrl & ~WINBIND_TRY_FIRST_PASS_ARG; if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) { lctrl |= WINBIND_USE_FIRST_PASS_ARG; } retry = 0; ret = PAM_AUTHTOK_ERR; while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) { /* * use_authtok is to force the use of a previously entered * password -- needed for pluggable password strength checking */ ret = _winbind_read_password(pamh, lctrl, NULL, "Enter new NT password: ", "Retype new NT password: ", (const char **) &pass_new); if (ret != PAM_SUCCESS) { _pam_log_debug(pamh, ctrl, LOG_ALERT ,"password - new password not obtained"); pass_old = NULL;/* tidy up */ goto out; } /* * At this point we know who the user is and what they * propose as their new password. Verify that the new * password is acceptable. */ if (pass_new[0] == '\0') {/* "\0" password = NULL */ pass_new = NULL; } } /* * By reaching here we have approved the passwords and must now * rebuild the password database file. */ _pam_get_data( pamh, PAM_WINBIND_PWD_LAST_SET, &pwdlastset_update); ret = winbind_chauthtok_request(pamh, ctrl, user, pass_old, pass_new, pwdlastset_update); if (ret) { _pam_overwrite(pass_new); _pam_overwrite(pass_old); pass_old = pass_new = NULL; goto out; } if (_pam_require_krb5_auth_after_chauthtok(pamh, ctrl, user)) { const char *member = get_member_from_config(pamh, argc, argv, ctrl, d); const char *cctype = get_krb5_cc_type_from_config(pamh, argc, argv, ctrl, d); ret = winbind_auth_request(pamh, ctrl, user, pass_new, member, cctype, &response, NULL, &username_ret); _pam_overwrite(pass_new); _pam_overwrite(pass_old); pass_old = pass_new = NULL; if (ret == PAM_SUCCESS) { /* warn a user if the password is about to expire soon */ _pam_warn_password_expiry(pamh, ctrl, &response, NULL); /* set some info3 info for other modules in the stack */ _pam_set_data_info3(pamh, ctrl, &response); /* put krb5ccname into env */ _pam_setup_krb5_env(pamh, ctrl, response.data.auth.krb5ccname); if (username_ret) { pam_set_item (pamh, PAM_USER, username_ret); _pam_log_debug(pamh, ctrl, LOG_INFO, "Returned user was '%s'", username_ret); free(username_ret); } } goto out; } } else { ret = PAM_SERVICE_ERR; } out: if (d) { iniparser_freedict(d); } /* Deal with offline errors. */ PAM_WB_REMARK_CHECK_RESPONSE(pamh, ctrl, response, "NT_STATUS_NO_LOGON_SERVERS"); PAM_WB_REMARK_CHECK_RESPONSE(pamh, ctrl, response, "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND"); PAM_WB_REMARK_CHECK_RESPONSE(pamh, ctrl, response, "NT_STATUS_ACCESS_DENIED"); _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", pamh, ctrl, ret); return ret; } #ifdef PAM_STATIC /* static module data */ struct pam_module _pam_winbind_modstruct = { MODULE_NAME, pam_sm_authenticate, pam_sm_setcred, pam_sm_acct_mgmt, pam_sm_open_session, pam_sm_close_session, pam_sm_chauthtok }; #endif /* * Copyright (c) Andrew Tridgell 2000 * Copyright (c) Tim Potter 2000 * Copyright (c) Andrew Bartlettt 2002 * Copyright (c) Guenther Deschner 2005-2007 * Copyright (c) Jan Rêkorajski 1999. * Copyright (c) Andrew G. Morgan 1996-8. * Copyright (c) Alex O. Yuriev, 1996. * Copyright (c) Cristian Gafton 1996. * Copyright (C) Elliot Lee 1996, Red Hat Software. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, and the entire permission notice in its entirety, * including the disclaimer of warranties. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote * products derived from this software without specific prior * written permission. * * ALTERNATIVELY, this product may be distributed under the terms of * the GNU Public License, in which case the provisions of the GPL are * required INSTEAD OF the above restrictions. (This clause is * necessary due to a potential bad interaction between the GPL and * the restrictions contained in a BSD-style copyright.) * * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. */