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ML4SE23_G6_Original_Prev_Diverse

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void auth_request_log_info(struct auth_request *auth_request, const char *subsystem, const char *format, ...) { struct event *event = get_request_event(auth_request, subsystem); va_list va; va_start(va, format); T_BEGIN { string_t *str = t_str_new(128); str_vprintfa(str, format, va); e_info(event, "%s", str_c(str)); } T_END; va_end(va); }

struct auth_request *auth_request_new_dummy(struct event *parent_event) { struct auth_request *request; pool_t pool; pool = pool_alloconly_create(MEMPOOL_GROWING"auth_request", 1024); request = p_new(pool, struct auth_request, 1); request->pool = pool; auth_request_post_alloc_init(request, parent_event); return request; }

void auth_request_passdb_lookup_end(struct auth_request *request, enum passdb_result result) { i_assert(array_count(&request->authdb_event) > 0); struct event *event = authdb_event(request); struct event_passthrough *e = event_create_passthrough(event)-> set_name("auth_passdb_request_finished")-> add_str("result", passdb_result_to_string(result)); if (request->passdb_cache_result != AUTH_REQUEST_CACHE_NONE && request->set->cache_ttl != 0 && request->set->cache_size != 0) e->add_str("cache", auth_request_cache_result_to_str(request->passdb_cache_result)); e_debug(e->event(), "Finished passdb lookup"); event_unref(&event); array_pop_back(&request->authdb_event); }

enum passdb_result auth_request_password_missing(struct auth_request *request) { if (request->fields.skip_password_check) { /* This passdb wasn't used for authentication */ return PASSDB_RESULT_OK; } e_info(authdb_event(request), "No password returned (and no nopassword)"); return PASSDB_RESULT_PASSWORD_MISMATCH; }

void passdb_unregister_module(struct passdb_module_interface *iface) { struct passdb_module_interface *const *ifaces; unsigned int idx; array_foreach(&passdb_interfaces, ifaces) { if (*ifaces == iface) { idx = array_foreach_idx(&passdb_interfaces, ifaces); array_delete(&passdb_interfaces, idx, 1); return; } } i_panic("passdb_unregister_module(%s): Not registered", iface->name); }

auth_request_want_skip_userdb(struct auth_request *request, struct auth_userdb *userdb) { switch (userdb->skip) { case AUTH_USERDB_SKIP_NEVER: return FALSE; case AUTH_USERDB_SKIP_FOUND: return request->userdb_success; case AUTH_USERDB_SKIP_NOTFOUND: return !request->userdb_success; } i_unreached(); }

void auth_request_refresh_last_access(struct auth_request *request) { request->last_access = ioloop_time; if (request->to_abort != NULL) timeout_reset(request->to_abort); }

void auth_request_set_field_keyvalue(struct auth_request *request, const char *field, const char *default_scheme) { const char *key, *value; value = strchr(field, '='); if (value == NULL) { key = field; value = ""; } else { key = t_strdup_until(field, value); value++; } auth_request_set_field(request, key, value, default_scheme); }

auth_request_handle_passdb_callback(enum passdb_result *result, struct auth_request *request) { struct auth_passdb *next_passdb; enum auth_db_rule result_rule; bool passdb_continue = FALSE; if (request->passdb_password != NULL) { safe_memset(request->passdb_password, 0, strlen(request->passdb_password)); } auth_request_passdb_lookup_end(request, *result); if (request->passdb->set->deny && *result != PASSDB_RESULT_USER_UNKNOWN) { /* deny passdb. we can get through this step only if the lookup returned that user doesn't exist in it. internal errors are fatal here. */ if (*result != PASSDB_RESULT_INTERNAL_FAILURE) { e_info(authdb_event(request), "User found from deny passdb"); *result = PASSDB_RESULT_USER_DISABLED; } return TRUE; } if (request->failed) { /* The passdb didn't fail, but something inside it failed (e.g. allow_nets mismatch). Make sure we'll fail this lookup, but reset the failure so the next passdb can succeed. */ if (*result == PASSDB_RESULT_OK) *result = PASSDB_RESULT_USER_UNKNOWN; request->failed = FALSE; } /* users that exist but can't log in are special. we don't try to match any of the success/failure rules to them. they'll always fail. */ switch (*result) { case PASSDB_RESULT_USER_DISABLED: return TRUE; case PASSDB_RESULT_PASS_EXPIRED: auth_request_set_field(request, "reason", "Password expired", NULL); return TRUE; case PASSDB_RESULT_OK: result_rule = request->passdb->result_success; break; case PASSDB_RESULT_INTERNAL_FAILURE: result_rule = request->passdb->result_internalfail; break; case PASSDB_RESULT_NEXT: e_debug(authdb_event(request), "Not performing authentication (noauthenticate set)"); result_rule = AUTH_DB_RULE_CONTINUE; break; case PASSDB_RESULT_SCHEME_NOT_AVAILABLE: case PASSDB_RESULT_USER_UNKNOWN: case PASSDB_RESULT_PASSWORD_MISMATCH: default: result_rule = request->passdb->result_failure; break; } switch (result_rule) { case AUTH_DB_RULE_RETURN: break; case AUTH_DB_RULE_RETURN_OK: request->passdb_success = TRUE; break; case AUTH_DB_RULE_RETURN_FAIL: request->passdb_success = FALSE; break; case AUTH_DB_RULE_CONTINUE: passdb_continue = TRUE; if (*result == PASSDB_RESULT_OK) { /* password was successfully verified. don't bother checking it again. */ auth_request_set_password_verified(request); } break; case AUTH_DB_RULE_CONTINUE_OK: passdb_continue = TRUE; request->passdb_success = TRUE; /* password was successfully verified. don't bother checking it again. */ auth_request_set_password_verified(request); break; case AUTH_DB_RULE_CONTINUE_FAIL: passdb_continue = TRUE; request->passdb_success = FALSE; break; } /* nopassword check is specific to a single passdb and shouldn't leak to the next one. we already added it to cache. */ auth_fields_remove(request->fields.extra_fields, "nopassword"); auth_fields_remove(request->fields.extra_fields, "noauthenticate"); if (request->fields.requested_login_user != NULL && *result == PASSDB_RESULT_OK) { auth_request_master_user_login_finish(request); /* if the passdb lookup continues, it continues with non-master passdbs for the requested_login_user. */ next_passdb = auth_request_get_auth(request)->passdbs; } else { next_passdb = request->passdb->next; } while (next_passdb != NULL && auth_request_want_skip_passdb(request, next_passdb)) next_passdb = next_passdb->next; if (*result == PASSDB_RESULT_OK || *result == PASSDB_RESULT_NEXT) { /* this passdb lookup succeeded, preserve its extra fields */ auth_fields_snapshot(request->fields.extra_fields); request->snapshot_have_userdb_prefetch_set = request->userdb_prefetch_set; if (request->fields.userdb_reply != NULL) auth_fields_snapshot(request->fields.userdb_reply); } else { /* this passdb lookup failed, remove any extra fields it set */ auth_fields_rollback(request->fields.extra_fields); if (request->fields.userdb_reply != NULL) { auth_fields_rollback(request->fields.userdb_reply); request->userdb_prefetch_set = request->snapshot_have_userdb_prefetch_set; } } if (passdb_continue && next_passdb != NULL) { /* try next passdb. */ request->passdb = next_passdb; request->passdb_password = NULL; if (*result == PASSDB_RESULT_USER_UNKNOWN) { /* remember that we did at least one successful passdb lookup */ request->passdbs_seen_user_unknown = TRUE; } else if (*result == PASSDB_RESULT_INTERNAL_FAILURE) { /* remember that we have had an internal failure. at the end return internal failure if we couldn't successfully login. */ request->passdbs_seen_internal_failure = TRUE; } return FALSE; } else if (*result == PASSDB_RESULT_NEXT) { /* admin forgot to put proper passdb last */ e_error(request->event, "%sLast passdb had noauthenticate field, cannot authenticate user", auth_request_get_log_prefix_db(request)); *result = PASSDB_RESULT_INTERNAL_FAILURE; } else if (request->passdb_success) { /* either this or a previous passdb lookup succeeded. */ *result = PASSDB_RESULT_OK; } else if (request->passdbs_seen_internal_failure) { /* last passdb lookup returned internal failure. it may have had the correct password, so return internal failure instead of plain failure. */ *result = PASSDB_RESULT_INTERNAL_FAILURE; } return TRUE; }

void auths_free(void) { struct auth **auth; unsigned int i, count; /* deinit in reverse order, because modules have been allocated by the first auth pool that used them */ auth = array_get_modifiable(&auths, &count); for (i = count; i > 0; i--) pool_unref(&auth[i-1]->pool); array_free(&auths); }

static struct event *get_request_event(struct auth_request *request, const char *subsystem) { if (subsystem == AUTH_SUBSYS_DB) return authdb_event(request); else if (subsystem == AUTH_SUBSYS_MECH) return request->mech_event; else return request->event; }

auth_request_proxy_dns_callback(const struct dns_lookup_result *result, struct auth_request_proxy_dns_lookup_ctx *ctx) { struct auth_request *request = ctx->request; const char *host; unsigned int i; bool proxy_host_is_self; request->dns_lookup_ctx = NULL; ctx->dns_lookup = NULL; host = auth_fields_find(request->fields.extra_fields, "host"); i_assert(host != NULL); if (result->ret != 0) { auth_request_log_error(request, AUTH_SUBSYS_PROXY, "DNS lookup for %s failed: %s", host, result->error); request->internal_failure = TRUE; auth_request_proxy_finish_failure(request); } else { if (result->msecs > AUTH_DNS_WARN_MSECS) { auth_request_log_warning(request, AUTH_SUBSYS_PROXY, "DNS lookup for %s took %u.%03u s", host, result->msecs/1000, result->msecs % 1000); } auth_fields_add(request->fields.extra_fields, "hostip", net_ip2addr(&result->ips[0]), 0); proxy_host_is_self = FALSE; for (i = 0; i < result->ips_count; i++) { if (auth_request_proxy_ip_is_self(request, &result->ips[i])) { proxy_host_is_self = TRUE; break; } } auth_request_proxy_finish_ip(request, proxy_host_is_self); } if (ctx->callback != NULL) ctx->callback(result->ret == 0, request); auth_request_unref(&request); }

void auth_request_userdb_callback(enum userdb_result result, struct auth_request *request) { struct auth_userdb *userdb = request->userdb; struct auth_userdb *next_userdb; enum auth_db_rule result_rule; const char *error; bool userdb_continue = FALSE; switch (result) { case USERDB_RESULT_OK: result_rule = userdb->result_success; break; case USERDB_RESULT_INTERNAL_FAILURE: result_rule = userdb->result_internalfail; break; case USERDB_RESULT_USER_UNKNOWN: default: result_rule = userdb->result_failure; break; } switch (result_rule) { case AUTH_DB_RULE_RETURN: break; case AUTH_DB_RULE_RETURN_OK: request->userdb_success = TRUE; break; case AUTH_DB_RULE_RETURN_FAIL: request->userdb_success = FALSE; break; case AUTH_DB_RULE_CONTINUE: userdb_continue = TRUE; break; case AUTH_DB_RULE_CONTINUE_OK: userdb_continue = TRUE; request->userdb_success = TRUE; break; case AUTH_DB_RULE_CONTINUE_FAIL: userdb_continue = TRUE; request->userdb_success = FALSE; break; } auth_request_userdb_lookup_end(request, result); next_userdb = userdb->next; while (next_userdb != NULL && auth_request_want_skip_userdb(request, next_userdb)) next_userdb = next_userdb->next; if (userdb_continue && next_userdb != NULL) { /* try next userdb. */ if (result == USERDB_RESULT_INTERNAL_FAILURE) request->userdbs_seen_internal_failure = TRUE; if (result == USERDB_RESULT_OK) { /* this userdb lookup succeeded, preserve its extra fields */ if (userdb_template_export(userdb->override_fields_tmpl, request, &error) < 0) { e_error(request->event, "%sFailed to expand override_fields: %s", auth_request_get_log_prefix_db(request), error); request->private_callback.userdb( USERDB_RESULT_INTERNAL_FAILURE, request); return; } auth_fields_snapshot(request->fields.userdb_reply); } else { /* this userdb lookup failed, remove any extra fields it set */ auth_fields_rollback(request->fields.userdb_reply); } request->user_changed_by_lookup = FALSE; request->userdb = next_userdb; auth_request_lookup_user(request, request->private_callback.userdb); return; } if (request->userdb_success) { if (userdb_template_export(userdb->override_fields_tmpl, request, &error) < 0) { e_error(request->event, "%sFailed to expand override_fields: %s", auth_request_get_log_prefix_db(request), error); result = USERDB_RESULT_INTERNAL_FAILURE; } else { result = USERDB_RESULT_OK; } } else if (request->userdbs_seen_internal_failure || result == USERDB_RESULT_INTERNAL_FAILURE) { /* one of the userdb lookups failed. the user might have been in there, so this is an internal failure */ result = USERDB_RESULT_INTERNAL_FAILURE; } else if (request->client_pid != 0) { /* this was an actual login attempt, the user should have been found. */ if (auth_request_get_auth(request)->userdbs->next == NULL) { e_error(request->event, "%suser not found from userdb", auth_request_get_log_prefix_db(request)); } else { e_error(request->mech_event, "user not found from any userdbs"); } result = USERDB_RESULT_USER_UNKNOWN; } else { result = USERDB_RESULT_USER_UNKNOWN; } if (request->userdb_lookup_tempfailed) { /* no caching */ } else if (result != USERDB_RESULT_INTERNAL_FAILURE) { if (request->userdb_cache_result != AUTH_REQUEST_CACHE_HIT) auth_request_userdb_save_cache(request, result); } else if (passdb_cache != NULL && userdb->cache_key != NULL) { /* lookup failed. if we're looking here only because the request was expired in cache, fallback to using cached expired record. */ const char *cache_key = userdb->cache_key; if (auth_request_lookup_user_cache(request, cache_key, &result, TRUE)) { e_info(request->event, "%sFalling back to expired data from cache", auth_request_get_log_prefix_db(request)); } } request->private_callback.userdb(result, request); }

int auth_request_password_verify_log(struct auth_request *request, const char *plain_password, const char *crypted_password, const char *scheme, const char *subsystem, bool log_password_mismatch) { const unsigned char *raw_password; size_t raw_password_size; const char *error; int ret; struct password_generate_params gen_params = { .user = request->fields.original_username, .rounds = 0 }; if (request->fields.skip_password_check) { /* passdb continue* rule after a successful authentication */ return 1; } if (request->passdb->set->deny) { /* this is a deny database, we don't care about the password */ return 0; } if (auth_fields_exists(request->fields.extra_fields, "nopassword")) { auth_request_log_debug(request, subsystem, "Allowing any password"); return 1; } ret = password_decode(crypted_password, scheme, &raw_password, &raw_password_size, &error); if (ret <= 0) { if (ret < 0) { auth_request_log_error(request, subsystem, "Password data is not valid for scheme %s: %s", scheme, error); } else { auth_request_log_error(request, subsystem, "Unknown scheme %s", scheme); } return -1; } /* Use original_username since it may be important for some password schemes (eg. digest-md5). Otherwise the username is used only for logging purposes. */ ret = password_verify(plain_password, &gen_params, scheme, raw_password, raw_password_size, &error); if (ret < 0) { const char *password_str = request->set->debug_passwords ? t_strdup_printf(" '%s'", crypted_password) : ""; auth_request_log_error(request, subsystem, "Invalid password%s in passdb: %s", password_str, error); } else if (ret == 0) { if (log_password_mismatch) auth_request_log_password_mismatch(request, subsystem); } if (ret <= 0 && request->set->debug_passwords) T_BEGIN { log_password_failure(request, plain_password, crypted_password, scheme, &gen_params, subsystem); } T_END; return ret; }

static bool auth_request_lookup_user_cache(struct auth_request *request, const char *key, enum userdb_result *result_r, bool use_expired) { const char *value; struct auth_cache_node *node; bool expired, neg_expired; value = auth_cache_lookup(passdb_cache, request, key, &node, &expired, &neg_expired); if (value == NULL || (expired && !use_expired)) { request->userdb_cache_result = AUTH_REQUEST_CACHE_MISS; e_debug(request->event, value == NULL ? "%suserdb cache miss" : "%suserdb cache expired", auth_request_get_log_prefix_db(request)); return FALSE; } request->userdb_cache_result = AUTH_REQUEST_CACHE_HIT; e_debug(request->event, "%suserdb cache hit: %s", auth_request_get_log_prefix_db(request), value); if (*value == '\0') { /* negative cache entry */ *result_r = USERDB_RESULT_USER_UNKNOWN; auth_request_init_userdb_reply(request, FALSE); return TRUE; } /* We want to preserve any userdb fields set by the earlier passdb lookup, so initialize userdb_reply only if it doesn't exist. Don't add userdb's default_fields, because the entire userdb part of the result comes from the cache. */ if (request->fields.userdb_reply == NULL) auth_request_init_userdb_reply(request, FALSE); auth_request_userdb_import(request, value); *result_r = USERDB_RESULT_OK; return TRUE; }

auth_mech_verify_passdb(const struct auth *auth, const struct mech_module_list *list) { switch (list->module.passdb_need) { case MECH_PASSDB_NEED_NOTHING: break; case MECH_PASSDB_NEED_VERIFY_PLAIN: if (!auth_passdb_list_have_verify_plain(auth)) return FALSE; break; case MECH_PASSDB_NEED_VERIFY_RESPONSE: case MECH_PASSDB_NEED_LOOKUP_CREDENTIALS: if (!auth_passdb_list_have_lookup_credentials(auth)) return FALSE; break; case MECH_PASSDB_NEED_SET_CREDENTIALS: if (!auth_passdb_list_have_lookup_credentials(auth)) return FALSE; if (!auth_passdb_list_have_set_credentials(auth)) return FALSE; break; } return TRUE; }

static int auth_request_proxy_host_lookup(struct auth_request *request, const char *host, auth_request_proxy_cb_t *callback) { struct auth *auth = auth_default_service(); struct auth_request_proxy_dns_lookup_ctx *ctx; const char *value; unsigned int secs; /* need to do dns lookup for the host */ value = auth_fields_find(request->fields.extra_fields, "proxy_timeout"); if (value != NULL) { if (str_to_uint(value, &secs) < 0) { auth_request_log_error(request, AUTH_SUBSYS_PROXY, "Invalid proxy_timeout value: %s", value); } } ctx = p_new(request->pool, struct auth_request_proxy_dns_lookup_ctx, 1); ctx->request = request; auth_request_ref(request); request->dns_lookup_ctx = ctx; if (dns_client_lookup(auth->dns_client, host, request->event, auth_request_proxy_dns_callback, ctx, &ctx->dns_lookup) < 0) { /* failed early */ return -1; } ctx->callback = callback; return 0; }

void auths_init(void) { struct auth *auth; /* sanity checks */ i_assert(auth_request_var_expand_static_tab[AUTH_REQUEST_VAR_TAB_USER_IDX].key == 'u'); i_assert(auth_request_var_expand_static_tab[AUTH_REQUEST_VAR_TAB_USERNAME_IDX].key == 'n'); i_assert(auth_request_var_expand_static_tab[AUTH_REQUEST_VAR_TAB_DOMAIN_IDX].key == 'd'); i_assert(auth_request_var_expand_static_tab[AUTH_REQUEST_VAR_TAB_COUNT].key == '\0' && auth_request_var_expand_static_tab[AUTH_REQUEST_VAR_TAB_COUNT].long_key == NULL); i_assert(auth_request_var_expand_static_tab[AUTH_REQUEST_VAR_TAB_COUNT-1].key != '\0' || auth_request_var_expand_static_tab[AUTH_REQUEST_VAR_TAB_COUNT-1].long_key != NULL); array_foreach_elem(&auths, auth) auth_init(auth); }

void passdbs_init(void) { i_array_init(&passdb_interfaces, 16); i_array_init(&passdb_modules, 16); passdb_register_module(&passdb_passwd); passdb_register_module(&passdb_bsdauth); passdb_register_module(&passdb_dict); #ifdef HAVE_LUA passdb_register_module(&passdb_lua); #endif passdb_register_module(&passdb_passwd_file); passdb_register_module(&passdb_pam); passdb_register_module(&passdb_ldap); passdb_register_module(&passdb_sql); passdb_register_module(&passdb_static); passdb_register_module(&passdb_oauth2); }

void auths_preinit(const struct auth_settings *set, pool_t pool, const struct mechanisms_register *reg, const char *const *services) { struct master_service_settings_output set_output; const struct auth_settings *service_set; struct auth *auth; unsigned int i; const char *not_service = NULL; bool check_default = TRUE; auth_event = event_create(NULL); event_set_forced_debug(auth_event, set->debug); event_add_category(auth_event, &event_category_auth); i_array_init(&auths, 8); auth = auth_preinit(set, NULL, pool, reg); array_push_back(&auths, &auth); for (i = 0; services[i] != NULL; i++) { if (services[i][0] == '!') { if (not_service != NULL) { i_fatal("Can't have multiple protocol " "!services (seen %s and %s)", not_service, services[i]); } not_service = services[i]; } service_set = auth_settings_read(services[i], pool, &set_output); auth = auth_preinit(service_set, services[i], pool, reg); array_push_back(&auths, &auth); } if (not_service != NULL && str_array_find(services, not_service+1)) check_default = FALSE; array_foreach_elem(&auths, auth) { if (auth->service != NULL || check_default) auth_mech_list_verify_passdb(auth); } }

auth_request_append_password(struct auth_request *request, string_t *str) { const char *p, *log_type = request->set->verbose_passwords; unsigned int max_len = 1024; if (request->mech_password == NULL) return; p = strchr(log_type, ':'); if (p != NULL) { if (str_to_uint(p+1, &max_len) < 0) i_unreached(); log_type = t_strdup_until(log_type, p); } if (strcmp(log_type, "plain") == 0) { str_printfa(str, "(given password: %s)", t_strndup(request->mech_password, max_len)); } else if (strcmp(log_type, "sha1") == 0) { unsigned char sha1[SHA1_RESULTLEN]; sha1_get_digest(request->mech_password, strlen(request->mech_password), sha1); str_printfa(str, "(SHA1 of given password: %s)", t_strndup(binary_to_hex(sha1, sizeof(sha1)), max_len)); } else { i_unreached(); } }

void auth_request_set_credentials(struct auth_request *request, const char *scheme, const char *data, set_credentials_callback_t *callback) { struct auth_passdb *passdb = request->passdb; const char *cache_key, *new_credentials; cache_key = passdb_cache == NULL ? NULL : passdb->cache_key; if (cache_key != NULL) auth_cache_remove(passdb_cache, request, cache_key); request->private_callback.set_credentials = callback; new_credentials = t_strdup_printf("{%s}%s", scheme, data); if (passdb->passdb->blocking) passdb_blocking_set_credentials(request, new_credentials); else if (passdb->passdb->iface.set_credentials != NULL) { passdb->passdb->iface.set_credentials(request, new_credentials, callback); } else { /* this passdb doesn't support credentials update */ callback(FALSE, request); } }

void auth_request_fail(struct auth_request *request) { i_assert(request->state == AUTH_REQUEST_STATE_MECH_CONTINUE); auth_request_set_state(request, AUTH_REQUEST_STATE_FINISHED); auth_request_refresh_last_access(request); auth_request_log_finished(request); auth_request_handler_reply(request, AUTH_CLIENT_RESULT_FAILURE, "", 0); }

auth_request_proxy_finish_ip(struct auth_request *request, bool proxy_host_is_self) { const struct auth_request_fields *fields = &request->fields; if (!auth_fields_exists(fields->extra_fields, "proxy_maybe")) { /* proxying */ } else if (!proxy_host_is_self || !auth_request_proxy_is_self(request)) { /* proxy destination isn't ourself - proxy */ auth_fields_remove(fields->extra_fields, "proxy_maybe"); auth_fields_add(fields->extra_fields, "proxy", NULL, 0); } else { /* proxying to ourself - log in without proxying by dropping all the proxying fields. */ bool proxy_always = auth_fields_exists(fields->extra_fields, "proxy_always"); auth_request_proxy_finish_failure(request); if (proxy_always) { /* setup where "self" refers to the local director cluster, while "non-self" refers to remote clusters. we've matched self here, so add proxy field and let director fill the host. */ auth_fields_add(request->fields.extra_fields, "proxy", NULL, 0); } } }

static bool auth_passdb_list_have_set_credentials(const struct auth *auth) { const struct auth_passdb *passdb; for (passdb = auth->masterdbs; passdb != NULL; passdb = passdb->next) { if (passdb->passdb->iface.set_credentials != NULL) return TRUE; } for (passdb = auth->passdbs; passdb != NULL; passdb = passdb->next) { if (passdb->passdb->iface.set_credentials != NULL) return TRUE; } return FALSE; }

struct auth *auth_find_service(const char *name) { struct auth *const *a; unsigned int i, count; a = array_get(&auths, &count); if (name != NULL) { for (i = 1; i < count; i++) { if (strcmp(a[i]->service, name) == 0) return a[i]; } /* not found. maybe we can instead find a !service */ for (i = 1; i < count; i++) { if (a[i]->service[0] == '!' && strcmp(a[i]->service + 1, name) != 0) return a[i]; } } return a[0]; }

static void auth_deinit(struct auth *auth) { struct auth_passdb *passdb; struct auth_userdb *userdb; for (passdb = auth->masterdbs; passdb != NULL; passdb = passdb->next) passdb_deinit(passdb->passdb); for (passdb = auth->passdbs; passdb != NULL; passdb = passdb->next) passdb_deinit(passdb->passdb); for (userdb = auth->userdbs; userdb != NULL; userdb = userdb->next) userdb_deinit(userdb->userdb); dns_client_deinit(&auth->dns_client); }

auth_userdb_preinit(struct auth *auth, const struct auth_userdb_settings *set) { struct auth_userdb *auth_userdb, **dest; auth_userdb = p_new(auth->pool, struct auth_userdb, 1); auth_userdb->set = set; auth_userdb->skip = auth_userdb_skip_parse(set->skip); auth_userdb->result_success = auth_db_rule_parse(set->result_success); auth_userdb->result_failure = auth_db_rule_parse(set->result_failure); auth_userdb->result_internalfail = auth_db_rule_parse(set->result_internalfail); auth_userdb->default_fields_tmpl = userdb_template_build(auth->pool, set->driver, set->default_fields); auth_userdb->override_fields_tmpl = userdb_template_build(auth->pool, set->driver, set->override_fields); for (dest = &auth->userdbs; *dest != NULL; dest = &(*dest)->next) ; *dest = auth_userdb; auth_userdb->userdb = userdb_preinit(auth->pool, set); /* make sure any %variables in default_fields exist in cache_key */ if (auth_userdb->userdb->default_cache_key != NULL) { auth_userdb->cache_key = p_strconcat(auth->pool, auth_userdb->userdb->default_cache_key, set->default_fields, NULL); } else { auth_userdb->cache_key = NULL; } }

static bool auth_passdb_list_have_lookup_credentials(const struct auth *auth) { const struct auth_passdb *passdb; for (passdb = auth->passdbs; passdb != NULL; passdb = passdb->next) { if (passdb->passdb->iface.lookup_credentials != NULL) return TRUE; } return FALSE; }

void auth_request_set_state(struct auth_request *request, enum auth_request_state state) { if (request->state == state) return; i_assert(request->to_penalty == NULL); i_assert(auth_request_state_count[request->state] > 0); auth_request_state_count[request->state]--; auth_request_state_count[state]++; request->state = state; auth_refresh_proctitle(); }

void auth_request_success(struct auth_request *request, const void *data, size_t data_size) { i_assert(request->state == AUTH_REQUEST_STATE_MECH_CONTINUE); if (!request->set->policy_check_after_auth) { struct auth_policy_check_ctx *ctx = p_new(request->pool, struct auth_policy_check_ctx, 1); ctx->success_data = buffer_create_dynamic(request->pool, 1); ctx->request = request; ctx->type = AUTH_POLICY_CHECK_TYPE_SUCCESS; auth_request_policy_check_callback(0, ctx); return; } /* perform second policy lookup here */ struct auth_policy_check_ctx *ctx = p_new(request->pool, struct auth_policy_check_ctx, 1); ctx->request = request; ctx->success_data = buffer_create_dynamic(request->pool, data_size); buffer_append(ctx->success_data, data, data_size); ctx->type = AUTH_POLICY_CHECK_TYPE_SUCCESS; auth_policy_check(request, request->mech_password, auth_request_policy_check_callback, ctx); }

void auth_request_verify_plain_callback(enum passdb_result result, struct auth_request *request) { struct auth_passdb *passdb = request->passdb; i_assert(request->state == AUTH_REQUEST_STATE_PASSDB); auth_request_set_state(request, AUTH_REQUEST_STATE_MECH_CONTINUE); if (result == PASSDB_RESULT_OK && auth_fields_exists(request->fields.extra_fields, "noauthenticate")) result = PASSDB_RESULT_NEXT; if (result != PASSDB_RESULT_INTERNAL_FAILURE) auth_request_save_cache(request, result); else { /* lookup failed. if we're looking here only because the request was expired in cache, fallback to using cached expired record. */ const char *cache_key = passdb->cache_key; if (passdb_cache_verify_plain(request, cache_key, request->mech_password, &result, TRUE)) { e_info(authdb_event(request), "Falling back to expired data from cache"); return; } } auth_request_verify_plain_callback_finish(result, request); }

void auth_request_initial(struct auth_request *request) { i_assert(request->state == AUTH_REQUEST_STATE_NEW); auth_request_set_state(request, AUTH_REQUEST_STATE_MECH_CONTINUE); if (auth_request_fail_on_nuls(request, request->initial_response, request->initial_response_len)) return; request->mech->auth_initial(request, request->initial_response, request->initial_response_len); }

static enum auth_userdb_skip auth_userdb_skip_parse(const char *str) { if (strcmp(str, "never") == 0) return AUTH_USERDB_SKIP_NEVER; if (strcmp(str, "found") == 0) return AUTH_USERDB_SKIP_FOUND; if (strcmp(str, "notfound") == 0) return AUTH_USERDB_SKIP_NOTFOUND; i_unreached(); }

auth_request_validate_networks(struct auth_request *request, const char *name, const char *networks, const struct ip_addr *remote_ip) { const char *const *net; struct ip_addr net_ip; unsigned int bits; bool found = FALSE; for (net = t_strsplit_spaces(networks, ", "); *net != NULL; net++) { e_debug(authdb_event(request), "%s: Matching for network %s", name, *net); if (strcmp(*net, "local") == 0) { if (remote_ip->family == 0) { found = TRUE; break; } } else if (net_parse_range(*net, &net_ip, &bits) < 0) { e_info(authdb_event(request), "%s: Invalid network '%s'", name, *net); } else if (remote_ip->family != 0 && net_is_in_network(remote_ip, &net_ip, bits)) { found = TRUE; break; } } if (found) ; else if (remote_ip->family == 0) { e_info(authdb_event(request), "%s check failed: Remote IP not known and 'local' missing", name); } else { e_info(authdb_event(request), "%s check failed: IP %s not in allowed networks", name, net_ip2addr(remote_ip)); } if (!found) request->failed = TRUE; }

static void auth_request_set_uidgid_file(struct auth_request *request, const char *path_template) { string_t *path; struct stat st; const char *error; path = t_str_new(256); if (auth_request_var_expand(path, path_template, request, NULL, &error) <= 0) { e_error(authdb_event(request), "Failed to expand uidgid_file=%s: %s", path_template, error); request->userdb_lookup_tempfailed = TRUE; } else if (stat(str_c(path), &st) < 0) { e_error(authdb_event(request), "stat(%s) failed: %m", str_c(path)); request->userdb_lookup_tempfailed = TRUE; } else { auth_fields_add(request->fields.userdb_reply, "uid", dec2str(st.st_uid), 0); auth_fields_add(request->fields.userdb_reply, "gid", dec2str(st.st_gid), 0); } }

struct auth *auth_default_service(void) { struct auth *const *a; unsigned int count; a = array_get(&auths, &count); return a[0]; }

auth_request_want_skip_passdb(struct auth_request *request, struct auth_passdb *passdb) { /* if mechanism is not supported, skip */ const char *const *mechs = passdb->mechanisms; const char *const *username_filter = passdb->username_filter; const char *username; username = request->fields.user; if (!auth_request_mechanism_accepted(mechs, request->mech)) { auth_request_log_debug(request, request->mech != NULL ? AUTH_SUBSYS_MECH : "none", "skipping passdb: mechanism filtered"); return TRUE; } if (passdb->username_filter != NULL && !auth_request_username_accepted(username_filter, username)) { auth_request_log_debug(request, request->mech != NULL ? AUTH_SUBSYS_MECH : "none", "skipping passdb: username filtered"); return TRUE; } /* skip_password_check basically specifies if authentication is finished */ bool authenticated = request->fields.skip_password_check; switch (passdb->skip) { case AUTH_PASSDB_SKIP_NEVER: return FALSE; case AUTH_PASSDB_SKIP_AUTHENTICATED: return authenticated; case AUTH_PASSDB_SKIP_UNAUTHENTICATED: return !authenticated; } i_unreached(); }

bool passdb_get_credentials(struct auth_request *auth_request, const char *input, const char *input_scheme, const unsigned char **credentials_r, size_t *size_r) { const char *wanted_scheme = auth_request->wanted_credentials_scheme; const char *plaintext, *error; int ret; struct password_generate_params pwd_gen_params; if (auth_request->prefer_plain_credentials && password_scheme_is_alias(input_scheme, "PLAIN")) { /* we've a plaintext scheme and we prefer to get it instead of converting it to the fallback scheme */ wanted_scheme = ""; } ret = password_decode(input, input_scheme, credentials_r, size_r, &error); if (ret <= 0) { if (ret < 0) { e_error(authdb_event(auth_request), "Password data is not valid for scheme %s: %s", input_scheme, error); } else { e_error(authdb_event(auth_request), "Unknown scheme %s", input_scheme); } return FALSE; } if (*wanted_scheme == '\0') { /* anything goes. change the wanted_credentials_scheme to what we actually got, so blocking passdbs work. */ auth_request->wanted_credentials_scheme = p_strdup(auth_request->pool, t_strcut(input_scheme, '.')); return TRUE; } if (!password_scheme_is_alias(input_scheme, wanted_scheme)) { if (!password_scheme_is_alias(input_scheme, "PLAIN")) { const char *error = t_strdup_printf( "Requested %s scheme, but we have only %s", wanted_scheme, input_scheme); if (auth_request->set->debug_passwords) { error = t_strdup_printf("%s (input: %s)", error, input); } e_info(authdb_event(auth_request), "%s", error); return FALSE; } /* we can generate anything out of plaintext passwords */ plaintext = t_strndup(*credentials_r, *size_r); i_zero(&pwd_gen_params); pwd_gen_params.user = auth_request->fields.original_username; if (!auth_request->domain_is_realm && strchr(pwd_gen_params.user, '@') != NULL) { /* domain must not be used as realm. add the @realm. */ pwd_gen_params.user = t_strconcat(pwd_gen_params.user, "@", auth_request->fields.realm, NULL); } if (auth_request->set->debug_passwords) { e_debug(authdb_event(auth_request), "Generating %s from user '%s', password '%s'", wanted_scheme, pwd_gen_params.user, plaintext); } if (!password_generate(plaintext, &pwd_gen_params, wanted_scheme, credentials_r, size_r)) { e_error(authdb_event(auth_request), "Requested unknown scheme %s", wanted_scheme); return FALSE; } } return TRUE; }

auth_preinit(const struct auth_settings *set, const char *service, pool_t pool, const struct mechanisms_register *reg) { struct auth_passdb_settings *const *passdbs; struct auth_userdb_settings *const *userdbs; struct auth *auth; unsigned int i, count, db_count, passdb_count, last_passdb = 0; auth = p_new(pool, struct auth, 1); auth->pool = pool; auth->service = p_strdup(pool, service); auth->set = set; auth->reg = reg; if (array_is_created(&set->passdbs)) passdbs = array_get(&set->passdbs, &db_count); else { passdbs = NULL; db_count = 0; } /* initialize passdbs first and count them */ for (passdb_count = 0, i = 0; i < db_count; i++) { if (passdbs[i]->master) continue; /* passdb { skip=unauthenticated } as the first passdb doesn't make sense, since user is never authenticated at that point. skip over them silently. */ if (auth->passdbs == NULL && auth_passdb_skip_parse(passdbs[i]->skip) == AUTH_PASSDB_SKIP_UNAUTHENTICATED) continue; auth_passdb_preinit(auth, passdbs[i], &auth->passdbs); passdb_count++; last_passdb = i; } if (passdb_count != 0 && passdbs[last_passdb]->pass) i_fatal("Last passdb can't have pass=yes"); for (i = 0; i < db_count; i++) { if (!passdbs[i]->master) continue; /* skip skip=unauthenticated, as explained above */ if (auth->masterdbs == NULL && auth_passdb_skip_parse(passdbs[i]->skip) == AUTH_PASSDB_SKIP_UNAUTHENTICATED) continue; if (passdbs[i]->deny) i_fatal("Master passdb can't have deny=yes"); if (passdbs[i]->pass && passdb_count == 0) { i_fatal("Master passdb can't have pass=yes " "if there are no passdbs"); } auth_passdb_preinit(auth, passdbs[i], &auth->masterdbs); } if (array_is_created(&set->userdbs)) { userdbs = array_get(&set->userdbs, &count); for (i = 0; i < count; i++) auth_userdb_preinit(auth, userdbs[i]); } if (auth->userdbs == NULL) { /* use a dummy userdb static. */ auth_userdb_preinit(auth, &userdb_dummy_set); } return auth; }

auth_request_lookup_credentials_finish(enum passdb_result result, const unsigned char *credentials, size_t size, struct auth_request *request) { const char *error; if (passdb_template_export(request->passdb->override_fields_tmpl, request, &error) < 0) { e_error(authdb_event(request), "Failed to expand override_fields: %s", error); result = PASSDB_RESULT_INTERNAL_FAILURE; } if (!auth_request_handle_passdb_callback(&result, request)) { /* try next passdb */ if (request->fields.skip_password_check && request->fields.delayed_credentials == NULL && size > 0) { /* passdb continue* rule after a successful lookup. remember these credentials and use them later on. */ auth_request_set_delayed_credentials(request, credentials, size); } auth_request_lookup_credentials(request, request->wanted_credentials_scheme, request->private_callback.lookup_credentials); } else { if (request->fields.delayed_credentials != NULL && size == 0) { /* we did multiple passdb lookups, but the last one didn't provide any credentials (e.g. just wanted to add some extra fields). so use the first passdb's credentials instead. */ credentials = request->fields.delayed_credentials; size = request->fields.delayed_credentials_size; } if (request->set->debug_passwords && result == PASSDB_RESULT_OK) { e_debug(authdb_event(request), "Credentials: %s", binary_to_hex(credentials, size)); } if (result == PASSDB_RESULT_SCHEME_NOT_AVAILABLE && request->passdbs_seen_user_unknown) { /* one of the passdbs accepted the scheme, but the user was unknown there */ result = PASSDB_RESULT_USER_UNKNOWN; } request->passdb_result = result; request->private_callback. lookup_credentials(result, credentials, size, request); } }

static void get_log_identifier(string_t *str, struct auth_request *auth_request) { const char *ip; if (auth_request->fields.user == NULL) str_append(str, "?"); else str_sanitize_append(str, auth_request->fields.user, MAX_LOG_USERNAME_LEN); ip = net_ip2addr(&auth_request->fields.remote_ip); if (ip[0] != '\0') { str_append_c(str, ','); str_append(str, ip); } if (auth_request->fields.requested_login_user != NULL) str_append(str, ",master"); if (auth_request->fields.session_id != NULL) str_printfa(str, ",<%s>", auth_request->fields.session_id); }

void passdb_handle_credentials(enum passdb_result result, const char *password, const char *scheme, lookup_credentials_callback_t *callback, struct auth_request *auth_request) { const unsigned char *credentials = NULL; size_t size = 0; if (result != PASSDB_RESULT_OK) { callback(result, NULL, 0, auth_request); return; } else if (auth_fields_exists(auth_request->fields.extra_fields, "noauthenticate")) { callback(PASSDB_RESULT_NEXT, NULL, 0, auth_request); return; } if (password != NULL) { if (!passdb_get_credentials(auth_request, password, scheme, &credentials, &size)) result = PASSDB_RESULT_SCHEME_NOT_AVAILABLE; } else if (*auth_request->wanted_credentials_scheme == '\0') { /* We're doing a passdb lookup (not authenticating). Pass through a NULL password without an error. */ } else if (auth_request->fields.delayed_credentials != NULL) { /* We already have valid credentials from an earlier passdb lookup. auth_request_lookup_credentials_finish() will use them. */ } else { e_info(authdb_event(auth_request), "Requested %s scheme, but we have a NULL password", auth_request->wanted_credentials_scheme); result = PASSDB_RESULT_SCHEME_NOT_AVAILABLE; } callback(result, credentials, size, auth_request); }

void auth_request_get_log_prefix(string_t *str, struct auth_request *auth_request, const char *subsystem) { const char *name; if (subsystem == AUTH_SUBSYS_DB) { if (!auth_request->userdb_lookup) { i_assert(auth_request->passdb != NULL); name = auth_request->passdb->set->name[0] != '\0' ? auth_request->passdb->set->name : auth_request->passdb->passdb->iface.name; } else { i_assert(auth_request->userdb != NULL); name = auth_request->userdb->set->name[0] != '\0' ? auth_request->userdb->set->name : auth_request->userdb->userdb->iface->name; } } else if (subsystem == AUTH_SUBSYS_MECH) { i_assert(auth_request->mech != NULL); name = t_str_lcase(auth_request->mech->mech_name); } else { name = subsystem; } str_append(str, name); str_append_c(str, '('); get_log_identifier(str, auth_request); str_append(str, "): "); }

static void auth_request_userdb_save_cache(struct auth_request *request, enum userdb_result result) { struct auth_userdb *userdb = request->userdb; string_t *str; const char *cache_value; if (passdb_cache == NULL || userdb->cache_key == NULL) return; if (result == USERDB_RESULT_USER_UNKNOWN) cache_value = ""; else { str = t_str_new(128); auth_fields_append(request->fields.userdb_reply, str, AUTH_FIELD_FLAG_CHANGED, AUTH_FIELD_FLAG_CHANGED); if (request->user_changed_by_lookup) { /* username was changed by passdb or userdb */ if (str_len(str) > 0) str_append_c(str, '\t'); str_append(str, "user="); str_append_tabescaped(str, request->fields.user); } if (str_len(str) == 0) { /* no userdb fields. but we can't save an empty string, since that means "user unknown". */ str_append(str, AUTH_REQUEST_USER_KEY_IGNORE); } cache_value = str_c(str); } /* last_success has no meaning with userdb */ auth_cache_insert(passdb_cache, request, userdb->cache_key, cache_value, FALSE); }

static const char *get_log_prefix_mech(struct auth_request *auth_request) { string_t *str = t_str_new(64); auth_request_get_log_prefix(str, auth_request, AUTH_SUBSYS_MECH); return str_c(str); }

void passdbs_deinit(void) { array_free(&passdb_modules); array_free(&passdb_interfaces); }

passdb_find(const char *driver, const char *args, unsigned int *idx_r) { struct passdb_module *const *passdbs; unsigned int i, count; passdbs = array_get(&passdb_modules, &count); for (i = 0; i < count; i++) { if (strcmp(passdbs[i]->iface.name, driver) == 0 && strcmp(passdbs[i]->args, args) == 0) { *idx_r = i; return passdbs[i]; } } return NULL; }

void auth_request_init(struct auth_request *request) { struct auth *auth; auth = auth_request_get_auth(request); request->set = auth->set; request->passdb = auth->passdbs; request->userdb = auth->userdbs; }

static void auth_request_save_cache(struct auth_request *request, enum passdb_result result) { struct auth_passdb *passdb = request->passdb; const char *encoded_password; string_t *str; struct password_generate_params gen_params = { .user = request->fields.user, .rounds = 0 }; switch (result) { case PASSDB_RESULT_USER_UNKNOWN: case PASSDB_RESULT_PASSWORD_MISMATCH: case PASSDB_RESULT_OK: case PASSDB_RESULT_SCHEME_NOT_AVAILABLE: /* can be cached */ break; case PASSDB_RESULT_NEXT: case PASSDB_RESULT_USER_DISABLED: case PASSDB_RESULT_PASS_EXPIRED: /* FIXME: we can't cache this now, or cache lookup would return success. */ return; case PASSDB_RESULT_INTERNAL_FAILURE: i_unreached(); } if (passdb_cache == NULL || passdb->cache_key == NULL) return; if (result < 0) { /* lookup failed. */ if (result == PASSDB_RESULT_USER_UNKNOWN) { auth_cache_insert(passdb_cache, request, passdb->cache_key, "", FALSE); } return; } if (request->passdb_password == NULL && !auth_fields_exists(request->fields.extra_fields, "nopassword")) { /* passdb didn't provide the correct password */ if (result != PASSDB_RESULT_OK || request->mech_password == NULL) return; /* we can still cache valid password lookups though. strdup() it so that mech_password doesn't get cleared too early. */ if (!password_generate_encoded(request->mech_password, &gen_params, CACHED_PASSWORD_SCHEME, &encoded_password)) i_unreached(); request->passdb_password = p_strconcat(request->pool, "{"CACHED_PASSWORD_SCHEME"}", encoded_password, NULL); } /* save all except the currently given password in cache */ str = t_str_new(256); if (request->passdb_password != NULL) { if (*request->passdb_password != '{') { /* cached passwords must have a known scheme */ str_append_c(str, '{'); str_append(str, passdb->passdb->default_pass_scheme); str_append_c(str, '}'); } str_append_tabescaped(str, request->passdb_password); } if (!auth_fields_is_empty(request->fields.extra_fields)) { str_append_c(str, '\t'); /* add only those extra fields to cache that were set by this passdb lookup. the CHANGED flag does this, because we snapshotted the extra_fields before the current passdb lookup. */ auth_fields_append(request->fields.extra_fields, str, AUTH_FIELD_FLAG_CHANGED, AUTH_FIELD_FLAG_CHANGED); } auth_cache_insert(passdb_cache, request, passdb->cache_key, str_c(str), result == PASSDB_RESULT_OK); }

void auth_request_proxy_finish_failure(struct auth_request *request) { /* drop all proxying fields */ auth_fields_remove(request->fields.extra_fields, "proxy"); auth_fields_remove(request->fields.extra_fields, "proxy_maybe"); auth_fields_remove(request->fields.extra_fields, "proxy_always"); auth_fields_remove(request->fields.extra_fields, "host"); auth_fields_remove(request->fields.extra_fields, "port"); auth_fields_remove(request->fields.extra_fields, "destuser"); }

void auth_request_userdb_lookup_begin(struct auth_request *request) { struct event *event; const char *name; i_assert(request->userdb != NULL); i_assert(request->userdb_lookup); request->userdb_cache_result = AUTH_REQUEST_CACHE_NONE; name = (request->userdb->set->name[0] != '\0' ? request->userdb->set->name : request->userdb->userdb->iface->name); event = event_create(request->event); event_add_str(event, "userdb_id", dec2str(request->userdb->userdb->id)); event_add_str(event, "userdb_name", name); event_add_str(event, "userdb", request->userdb->userdb->iface->name); event_set_log_prefix_callback(event, FALSE, auth_request_get_log_prefix_db, request); /* check if we should enable verbose logging here*/ if (*request->userdb->set->auth_verbose == 'y') event_set_min_log_level(event, LOG_TYPE_INFO); else if (*request->userdb->set->auth_verbose == 'n') event_set_min_log_level(event, LOG_TYPE_WARNING); e_debug(event_create_passthrough(event)-> set_name("auth_userdb_request_started")-> event(), "Performing userdb lookup"); array_push_back(&request->authdb_event, &event); }

static bool password_has_illegal_chars(const char *password) { for (; *password != '\0'; password++) { switch (*password) { case '\001': case '\t': case '\r': case '\n': /* these characters have a special meaning in internal protocols, make sure the password doesn't accidentally get there unescaped. */ return TRUE; } } return FALSE; }

void auth_request_set_null_field(struct auth_request *request, const char *name) { if (str_begins_with(name, "userdb_")) { /* make sure userdb prefetch is used even if all the fields were returned as NULL. */ request->userdb_prefetch_set = TRUE; } }

static bool auth_passdb_list_have_verify_plain(const struct auth *auth) { const struct auth_passdb *passdb; for (passdb = auth->passdbs; passdb != NULL; passdb = passdb->next) { if (passdb->passdb->iface.verify_plain != NULL) return TRUE; } return FALSE; }

auth_request_set_password(struct auth_request *request, const char *value, const char *default_scheme, bool noscheme) { if (request->passdb_password != NULL) { e_error(authdb_event(request), "Multiple password values not supported"); return; } /* if the password starts with '{' it most likely contains also '}'. check it anyway to make sure, because we assert-crash later if it doesn't exist. this could happen if plaintext passwords are used. */ if (*value == '{' && !noscheme && strchr(value, '}') != NULL) request->passdb_password = p_strdup(request->pool, value); else { i_assert(default_scheme != NULL); request->passdb_password = p_strdup_printf(request->pool, "{%s}%s", default_scheme, value); } }

void auth_request_set_userdb_field(struct auth_request *request, const char *name, const char *value) { size_t name_len = strlen(name); uid_t uid; gid_t gid; i_assert(value != NULL); if (name_len > 10 && strcmp(name+name_len-10, ":protected") == 0) { /* set this field only if it hasn't been set before */ name = t_strndup(name, name_len-10); if (auth_fields_exists(request->fields.userdb_reply, name)) return; } else if (name_len > 7 && strcmp(name+name_len-7, ":remove") == 0) { /* remove this field entirely */ name = t_strndup(name, name_len-7); auth_fields_remove(request->fields.userdb_reply, name); return; } if (strcmp(name, "uid") == 0) { uid = userdb_parse_uid(request, value); if (uid == (uid_t)-1) { request->userdb_lookup_tempfailed = TRUE; return; } value = dec2str(uid); } else if (strcmp(name, "gid") == 0) { gid = userdb_parse_gid(request, value); if (gid == (gid_t)-1) { request->userdb_lookup_tempfailed = TRUE; return; } value = dec2str(gid); } else if (strcmp(name, "tempfail") == 0) { request->userdb_lookup_tempfailed = TRUE; return; } else if (auth_request_try_update_username(request, name, value)) { return; } else if (strcmp(name, "uidgid_file") == 0) { auth_request_set_uidgid_file(request, value); return; } else if (strcmp(name, "userdb_import") == 0) { auth_request_userdb_import(request, value); return; } else if (strcmp(name, "system_user") == 0) { /* FIXME: the system_user is for backwards compatibility */ static bool warned = FALSE; if (!warned) { e_warning(authdb_event(request), "Replace system_user with system_groups_user"); warned = TRUE; } name = "system_groups_user"; } else if (strcmp(name, AUTH_REQUEST_USER_KEY_IGNORE) == 0) { return; } auth_fields_add(request->fields.userdb_reply, name, value, 0); }

void passdbs_generate_md5(unsigned char md5[STATIC_ARRAY MD5_RESULTLEN]) { struct md5_context ctx; struct passdb_module *const *passdbs; unsigned int i, count; md5_init(&ctx); passdbs = array_get(&passdb_modules, &count); for (i = 0; i < count; i++) { md5_update(&ctx, &passdbs[i]->id, sizeof(passdbs[i]->id)); md5_update(&ctx, passdbs[i]->iface.name, strlen(passdbs[i]->iface.name)); md5_update(&ctx, passdbs[i]->args, strlen(passdbs[i]->args)); } md5_final(&ctx, md5); }

auth_request_cache_result_to_str(enum auth_request_cache_result result) { switch(result) { case AUTH_REQUEST_CACHE_NONE: return "none"; case AUTH_REQUEST_CACHE_HIT: return "hit"; case AUTH_REQUEST_CACHE_MISS: return "miss"; default: i_unreached(); } }

auth_request_mechanism_accepted(const char *const *mechs, const struct mech_module *mech) { /* no filter specified, anything goes */ if (mechs == NULL) return TRUE; /* request has no mechanism, see if none is accepted */ if (mech == NULL) return str_array_icase_find(mechs, "none"); /* check if request mechanism is accepted */ return str_array_icase_find(mechs, mech->mech_name); }

auth_request_userdb_import(struct auth_request *request, const char *args) { const char *key, *value, *const *arg; for (arg = t_strsplit(args, "\t"); *arg != NULL; arg++) { value = strchr(*arg, '='); if (value == NULL) { key = *arg; value = ""; } else { key = t_strdup_until(*arg, value); value++; } auth_request_set_userdb_field(request, key, value); } }

void auth_request_policy_check_callback(int result, void *context) { struct auth_policy_check_ctx *ctx = context; ctx->request->policy_processed = TRUE; /* It's possible that multiple policy lookups return a penalty. Sum them all up to the event. */ ctx->request->policy_penalty += result < 0 ? 0 : result; if (ctx->request->set->policy_log_only && result != 0) { auth_request_policy_penalty_finish(context); return; } if (result < 0) { /* fail it right here and now */ auth_request_fail(ctx->request); } else if (ctx->type != AUTH_POLICY_CHECK_TYPE_SUCCESS && result > 0 && !ctx->request->fields.no_penalty) { ctx->request->to_penalty = timeout_add(result * 1000, auth_request_policy_penalty_finish, context); } else { auth_request_policy_penalty_finish(context); } }

void auth_request_passdb_lookup_begin(struct auth_request *request) { struct event *event; const char *name; i_assert(request->passdb != NULL); i_assert(!request->userdb_lookup); request->passdb_cache_result = AUTH_REQUEST_CACHE_NONE; name = (request->passdb->set->name[0] != '\0' ? request->passdb->set->name : request->passdb->passdb->iface.name); event = event_create(request->event); event_add_str(event, "passdb_id", dec2str(request->passdb->passdb->id)); event_add_str(event, "passdb_name", name); event_add_str(event, "passdb", request->passdb->passdb->iface.name); event_set_log_prefix_callback(event, FALSE, auth_request_get_log_prefix_db, request); /* check if we should enable verbose logging here */ if (*request->passdb->set->auth_verbose == 'y') event_set_min_log_level(event, LOG_TYPE_INFO); else if (*request->passdb->set->auth_verbose == 'n') event_set_min_log_level(event, LOG_TYPE_WARNING); e_debug(event_create_passthrough(event)-> set_name("auth_passdb_request_started")-> event(), "Performing passdb lookup"); array_push_back(&request->authdb_event, &event); }

void auths_deinit(void) { struct auth *auth; array_foreach_elem(&auths, auth) auth_deinit(auth); event_unref(&auth_event); }

bool auth_request_import_master(struct auth_request *request, const char *key, const char *value) { pid_t pid; i_assert(value != NULL); /* master request lookups may set these */ if (strcmp(key, "session_pid") == 0) { if (str_to_pid(value, &pid) == 0) request->session_pid = pid; } else if (strcmp(key, "request_auth_token") == 0) request->request_auth_token = TRUE; else return FALSE; return TRUE; }

static void auth_mech_list_verify_passdb(const struct auth *auth) { const struct mech_module_list *list; for (list = auth->reg->modules; list != NULL; list = list->next) { if (!auth_mech_verify_passdb(auth, list)) break; } if (list != NULL) { if (auth->passdbs == NULL) { i_fatal("No passdbs specified in configuration file. " "%s mechanism needs one", list->module.mech_name); } i_fatal("%s mechanism can't be supported with given passdbs", list->module.mech_name); } }

int CMS_data(CMS_ContentInfo *cms, BIO *out, unsigned int flags) { BIO *cont; int r; if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_data) { CMSerr(CMS_F_CMS_DATA, CMS_R_TYPE_NOT_DATA); return 0; } cont = CMS_dataInit(cms, NULL); if (!cont) return 0; r = cms_copy_content(out, cont, flags); BIO_free_all(cont); return r; }

CMS_ContentInfo *CMS_digest_create(BIO *in, const EVP_MD *md, unsigned int flags) { CMS_ContentInfo *cms; if (!md) md = EVP_sha1(); cms = cms_DigestedData_create(md); if (!cms) return NULL; if(!(flags & CMS_DETACHED)) CMS_set_detached(cms, 0); if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags)) return cms; CMS_ContentInfo_free(cms); return NULL; }

static BIO *cms_get_text_bio(BIO *out, unsigned int flags) { BIO *rbio; if (out == NULL) rbio = BIO_new(BIO_s_null()); else if (flags & CMS_TEXT) { rbio = BIO_new(BIO_s_mem()); BIO_set_mem_eof_return(rbio, 0); } else rbio = out; return rbio; }

int CMS_decrypt_set1_password(CMS_ContentInfo *cms, unsigned char *pass, ossl_ssize_t passlen) { STACK_OF(CMS_RecipientInfo) *ris; CMS_RecipientInfo *ri; int i, r; ris = CMS_get0_RecipientInfos(cms); for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) { ri = sk_CMS_RecipientInfo_value(ris, i); if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_PASS) continue; CMS_RecipientInfo_set0_password(ri, pass, passlen); r = CMS_RecipientInfo_decrypt(cms, ri); CMS_RecipientInfo_set0_password(ri, NULL, 0); if (r > 0) return 1; } CMSerr(CMS_F_CMS_DECRYPT_SET1_PASSWORD, CMS_R_NO_MATCHING_RECIPIENT); return 0; }

CMS_ContentInfo *CMS_data_create(BIO *in, unsigned int flags) { CMS_ContentInfo *cms; cms = cms_Data_create(); if (!cms) return NULL; if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags)) return cms; CMS_ContentInfo_free(cms); return NULL; }

int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out, unsigned int flags) { BIO *cont; int r; if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_id_smime_ct_compressedData) { CMSerr(CMS_F_CMS_UNCOMPRESS, CMS_R_TYPE_NOT_COMPRESSED_DATA); return 0; } if (!dcont && !check_content(cms)) return 0; cont = CMS_dataInit(cms, dcont); if (!cont) return 0; r = cms_copy_content(out, cont, flags); do_free_upto(cont, dcont); return r; }

static int check_content(CMS_ContentInfo *cms) { ASN1_OCTET_STRING **pos = CMS_get0_content(cms); if (!pos || !*pos) { CMSerr(CMS_F_CHECK_CONTENT, CMS_R_NO_CONTENT); return 0; } return 1; }

int CMS_decrypt_set1_pkey(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert) { STACK_OF(CMS_RecipientInfo) *ris; CMS_RecipientInfo *ri; int i, r, ri_type; int debug = 0; ris = CMS_get0_RecipientInfos(cms); if (ris) debug = cms->d.envelopedData->encryptedContentInfo->debug; ri_type = cms_pkey_get_ri_type(pk); if (ri_type == CMS_RECIPINFO_NONE) { CMSerr(CMS_F_CMS_DECRYPT_SET1_PKEY, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE); return 0; } for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) { ri = sk_CMS_RecipientInfo_value(ris, i); if (CMS_RecipientInfo_type(ri) != ri_type) continue; if (ri_type == CMS_RECIPINFO_AGREE) { r = cms_kari_set1_pkey(cms, ri, pk, cert); if (r > 0) return 1; if (r < 0) return 0; } /* If we have a cert try matching RecipientInfo * otherwise try them all. */ else if (!cert || !CMS_RecipientInfo_ktri_cert_cmp(ri, cert)) { CMS_RecipientInfo_set0_pkey(ri, pk); r = CMS_RecipientInfo_decrypt(cms, ri); CMS_RecipientInfo_set0_pkey(ri, NULL); if (cert) { /* If not debugging clear any error and * return success to avoid leaking of * information useful to MMA */ if (!debug) { ERR_clear_error(); return 1; } if (r > 0) return 1; CMSerr(CMS_F_CMS_DECRYPT_SET1_PKEY, CMS_R_DECRYPT_ERROR); return 0; } /* If no cert and not debugging don't leave loop * after first successful decrypt. Always attempt * to decrypt all recipients to avoid leaking timing * of a successful decrypt. */ else if (r > 0 && debug) return 1; } } /* If no cert and not debugging always return success */ if (!cert && !debug) { ERR_clear_error(); return 1; } CMSerr(CMS_F_CMS_DECRYPT_SET1_PKEY, CMS_R_NO_MATCHING_RECIPIENT); return 0; }

int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert, BIO *dcont, BIO *out, unsigned int flags) { int r; BIO *cont; if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_enveloped) { CMSerr(CMS_F_CMS_DECRYPT, CMS_R_TYPE_NOT_ENVELOPED_DATA); return 0; } if (!dcont && !check_content(cms)) return 0; if (flags & CMS_DEBUG_DECRYPT) cms->d.envelopedData->encryptedContentInfo->debug = 1; else cms->d.envelopedData->encryptedContentInfo->debug = 0; if (!pk && !cert && !dcont && !out) return 1; if (pk && !CMS_decrypt_set1_pkey(cms, pk, cert)) return 0; cont = CMS_dataInit(cms, dcont); if (!cont) return 0; r = cms_copy_content(out, cont, flags); do_free_upto(cont, dcont); return r; }

int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out, unsigned int flags) { CMSerr(CMS_F_CMS_UNCOMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM); return 0; }

CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags) { CMSerr(CMS_F_CMS_COMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM); return NULL; }

static int cms_kari_set1_pkey(CMS_ContentInfo *cms, CMS_RecipientInfo *ri, EVP_PKEY *pk, X509 *cert) { int i; STACK_OF(CMS_RecipientEncryptedKey) *reks; CMS_RecipientEncryptedKey *rek; reks = CMS_RecipientInfo_kari_get0_reks(ri); if (!cert) return 0; for (i = 0; i < sk_CMS_RecipientEncryptedKey_num(reks); i++) { int rv; rek = sk_CMS_RecipientEncryptedKey_value(reks, i); if (CMS_RecipientEncryptedKey_cert_cmp(rek, cert)) continue; CMS_RecipientInfo_kari_set0_pkey(ri, pk); rv = CMS_RecipientInfo_kari_decrypt(cms, ri, rek); CMS_RecipientInfo_kari_set0_pkey(ri, NULL); if (rv > 0) return 1; return -1; } return 0; }

int CMS_EncryptedData_decrypt(CMS_ContentInfo *cms, const unsigned char *key, size_t keylen, BIO *dcont, BIO *out, unsigned int flags) { BIO *cont; int r; if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_encrypted) { CMSerr(CMS_F_CMS_ENCRYPTEDDATA_DECRYPT, CMS_R_TYPE_NOT_ENCRYPTED_DATA); return 0; } if (!dcont && !check_content(cms)) return 0; if (CMS_EncryptedData_set1_key(cms, NULL, key, keylen) <= 0) return 0; cont = CMS_dataInit(cms, dcont); if (!cont) return 0; r = cms_copy_content(out, cont, flags); do_free_upto(cont, dcont); return r; }

static int cms_signerinfo_verify_cert(CMS_SignerInfo *si, X509_STORE *store, STACK_OF(X509) *certs, STACK_OF(X509_CRL) *crls, unsigned int flags) { X509_STORE_CTX ctx; X509 *signer; int i, j, r = 0; CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL); if (!X509_STORE_CTX_init(&ctx, store, signer, certs)) { CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT, CMS_R_STORE_INIT_ERROR); goto err; } X509_STORE_CTX_set_default(&ctx, "smime_sign"); if (crls) X509_STORE_CTX_set0_crls(&ctx, crls); i = X509_verify_cert(&ctx); if (i <= 0) { j = X509_STORE_CTX_get_error(&ctx); CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT, CMS_R_CERTIFICATE_VERIFY_ERROR); ERR_add_error_data(2, "Verify error:", X509_verify_cert_error_string(j)); goto err; } r = 1; err: X509_STORE_CTX_cleanup(&ctx); return r; }

int CMS_final(CMS_ContentInfo *cms, BIO *data, BIO *dcont, unsigned int flags) { BIO *cmsbio; int ret = 0; if (!(cmsbio = CMS_dataInit(cms, dcont))) { CMSerr(CMS_F_CMS_FINAL,ERR_R_MALLOC_FAILURE); return 0; } SMIME_crlf_copy(data, cmsbio, flags); (void)BIO_flush(cmsbio); if (!CMS_dataFinal(cms, cmsbio)) { CMSerr(CMS_F_CMS_FINAL,CMS_R_CMS_DATAFINAL_ERROR); goto err; } ret = 1; err: do_free_upto(cmsbio, dcont); return ret; }

CMS_ContentInfo *CMS_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs, BIO *data, unsigned int flags) { CMS_ContentInfo *cms; int i; cms = CMS_ContentInfo_new(); if (!cms || !CMS_SignedData_init(cms)) goto merr; if (pkey && !CMS_add1_signer(cms, signcert, pkey, NULL, flags)) { CMSerr(CMS_F_CMS_SIGN, CMS_R_ADD_SIGNER_ERROR); goto err; } for (i = 0; i < sk_X509_num(certs); i++) { X509 *x = sk_X509_value(certs, i); if (!CMS_add1_cert(cms, x)) goto merr; } if(!(flags & CMS_DETACHED)) CMS_set_detached(cms, 0); if ((flags & (CMS_STREAM|CMS_PARTIAL)) || CMS_final(cms, data, NULL, flags)) return cms; else goto err; merr: CMSerr(CMS_F_CMS_SIGN, ERR_R_MALLOC_FAILURE); err: if (cms) CMS_ContentInfo_free(cms); return NULL; }

CMS_ContentInfo *CMS_sign_receipt(CMS_SignerInfo *si, X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs, unsigned int flags) { CMS_SignerInfo *rct_si; CMS_ContentInfo *cms = NULL; ASN1_OCTET_STRING **pos, *os; BIO *rct_cont = NULL; int r = 0; flags &= ~(CMS_STREAM|CMS_TEXT); /* Not really detached but avoids content being allocated */ flags |= CMS_PARTIAL|CMS_BINARY|CMS_DETACHED; if (!pkey || !signcert) { CMSerr(CMS_F_CMS_SIGN_RECEIPT, CMS_R_NO_KEY_OR_CERT); return NULL; } /* Initialize signed data */ cms = CMS_sign(NULL, NULL, certs, NULL, flags); if (!cms) goto err; /* Set inner content type to signed receipt */ if (!CMS_set1_eContentType(cms, OBJ_nid2obj(NID_id_smime_ct_receipt))) goto err; rct_si = CMS_add1_signer(cms, signcert, pkey, NULL, flags); if (!rct_si) { CMSerr(CMS_F_CMS_SIGN_RECEIPT, CMS_R_ADD_SIGNER_ERROR); goto err; } os = cms_encode_Receipt(si); if (!os) goto err; /* Set content to digest */ rct_cont = BIO_new_mem_buf(os->data, os->length); if (!rct_cont) goto err; /* Add msgSigDigest attribute */ if (!cms_msgSigDigest_add1(rct_si, si)) goto err; /* Finalize structure */ if (!CMS_final(cms, rct_cont, NULL, flags)) goto err; /* Set embedded content */ pos = CMS_get0_content(cms); *pos = os; r = 1; err: if (rct_cont) BIO_free(rct_cont); if (r) return cms; CMS_ContentInfo_free(cms); return NULL; }

CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *data, const EVP_CIPHER *cipher, unsigned int flags) { CMS_ContentInfo *cms; int i; X509 *recip; cms = CMS_EnvelopedData_create(cipher); if (!cms) goto merr; for (i = 0; i < sk_X509_num(certs); i++) { recip = sk_X509_value(certs, i); if (!CMS_add1_recipient_cert(cms, recip, flags)) { CMSerr(CMS_F_CMS_ENCRYPT, CMS_R_RECIPIENT_ERROR); goto err; } } if(!(flags & CMS_DETACHED)) CMS_set_detached(cms, 0); if ((flags & (CMS_STREAM|CMS_PARTIAL)) || CMS_final(cms, data, NULL, flags)) return cms; else goto err; merr: CMSerr(CMS_F_CMS_ENCRYPT, ERR_R_MALLOC_FAILURE); err: if (cms) CMS_ContentInfo_free(cms); return NULL; }

int CMS_digest_verify(CMS_ContentInfo *cms, BIO *dcont, BIO *out, unsigned int flags) { BIO *cont; int r; if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_digest) { CMSerr(CMS_F_CMS_DIGEST_VERIFY, CMS_R_TYPE_NOT_DIGESTED_DATA); return 0; } if (!dcont && !check_content(cms)) return 0; cont = CMS_dataInit(cms, dcont); if (!cont) return 0; r = cms_copy_content(out, cont, flags); if (r) r = cms_DigestedData_do_final(cms, cont, 1); do_free_upto(cont, dcont); return r; }

int CMS_verify_receipt(CMS_ContentInfo *rcms, CMS_ContentInfo *ocms, STACK_OF(X509) *certs, X509_STORE *store, unsigned int flags) { int r; flags &= ~(CMS_DETACHED|CMS_TEXT); r = CMS_verify(rcms, certs, store, NULL, NULL, flags); if (r <= 0) return r; return cms_Receipt_verify(rcms, ocms); }

int CMS_decrypt_set1_key(CMS_ContentInfo *cms, unsigned char *key, size_t keylen, unsigned char *id, size_t idlen) { STACK_OF(CMS_RecipientInfo) *ris; CMS_RecipientInfo *ri; int i, r; ris = CMS_get0_RecipientInfos(cms); for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) { ri = sk_CMS_RecipientInfo_value(ris, i); if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_KEK) continue; /* If we have an id try matching RecipientInfo * otherwise try them all. */ if (!id || (CMS_RecipientInfo_kekri_id_cmp(ri, id, idlen) == 0)) { CMS_RecipientInfo_set0_key(ri, key, keylen); r = CMS_RecipientInfo_decrypt(cms, ri); CMS_RecipientInfo_set0_key(ri, NULL, 0); if (r > 0) return 1; if (id) { CMSerr(CMS_F_CMS_DECRYPT_SET1_KEY, CMS_R_DECRYPT_ERROR); return 0; } ERR_clear_error(); } } CMSerr(CMS_F_CMS_DECRYPT_SET1_KEY, CMS_R_NO_MATCHING_RECIPIENT); return 0; }

BIGNUM *BN_mod_sqrt(BIGNUM *in, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx) /* * Returns 'ret' such that ret^2 == a (mod p), using the Tonelli/Shanks * algorithm (cf. Henri Cohen, "A Course in Algebraic Computational Number * Theory", algorithm 1.5.1). 'p' must be prime, otherwise an error or * an incorrect "result" will be returned. */ { BIGNUM *ret = in; int err = 1; int r; BIGNUM *A, *b, *q, *t, *x, *y; int e, i, j; int used_ctx = 0; if (!BN_is_odd(p) || BN_abs_is_word(p, 1)) { if (BN_abs_is_word(p, 2)) { if (ret == NULL) ret = BN_new(); if (ret == NULL) goto end; if (!BN_set_word(ret, BN_is_bit_set(a, 0))) { if (ret != in) BN_free(ret); return NULL; } bn_check_top(ret); return ret; } ERR_raise(ERR_LIB_BN, BN_R_P_IS_NOT_PRIME); return NULL; } if (BN_is_zero(a) || BN_is_one(a)) { if (ret == NULL) ret = BN_new(); if (ret == NULL) goto end; if (!BN_set_word(ret, BN_is_one(a))) { if (ret != in) BN_free(ret); return NULL; } bn_check_top(ret); return ret; } BN_CTX_start(ctx); used_ctx = 1; A = BN_CTX_get(ctx); b = BN_CTX_get(ctx); q = BN_CTX_get(ctx); t = BN_CTX_get(ctx); x = BN_CTX_get(ctx); y = BN_CTX_get(ctx); if (y == NULL) goto end; if (ret == NULL) ret = BN_new(); if (ret == NULL) goto end; /* A = a mod p */ if (!BN_nnmod(A, a, p, ctx)) goto end; /* now write |p| - 1 as 2^e*q where q is odd */ e = 1; while (!BN_is_bit_set(p, e)) e++; /* we'll set q later (if needed) */ if (e == 1) { /*- * The easy case: (|p|-1)/2 is odd, so 2 has an inverse * modulo (|p|-1)/2, and square roots can be computed * directly by modular exponentiation. * We have * 2 * (|p|+1)/4 == 1 (mod (|p|-1)/2), * so we can use exponent (|p|+1)/4, i.e. (|p|-3)/4 + 1. */ if (!BN_rshift(q, p, 2)) goto end; q->neg = 0; if (!BN_add_word(q, 1)) goto end; if (!BN_mod_exp(ret, A, q, p, ctx)) goto end; err = 0; goto vrfy; } if (e == 2) { /*- * |p| == 5 (mod 8) * * In this case 2 is always a non-square since * Legendre(2,p) = (-1)^((p^2-1)/8) for any odd prime. * So if a really is a square, then 2*a is a non-square. * Thus for * b := (2*a)^((|p|-5)/8), * i := (2*a)*b^2 * we have * i^2 = (2*a)^((1 + (|p|-5)/4)*2) * = (2*a)^((p-1)/2) * = -1; * so if we set * x := a*b*(i-1), * then * x^2 = a^2 * b^2 * (i^2 - 2*i + 1) * = a^2 * b^2 * (-2*i) * = a*(-i)*(2*a*b^2) * = a*(-i)*i * = a. * * (This is due to A.O.L. Atkin, * Subject: Square Roots and Cognate Matters modulo p=8n+5. * URL: https://listserv.nodak.edu/cgi-bin/wa.exe?A2=ind9211&L=NMBRTHRY&P=4026 * November 1992.) */ /* t := 2*a */ if (!BN_mod_lshift1_quick(t, A, p)) goto end; /* b := (2*a)^((|p|-5)/8) */ if (!BN_rshift(q, p, 3)) goto end; q->neg = 0; if (!BN_mod_exp(b, t, q, p, ctx)) goto end; /* y := b^2 */ if (!BN_mod_sqr(y, b, p, ctx)) goto end; /* t := (2*a)*b^2 - 1 */ if (!BN_mod_mul(t, t, y, p, ctx)) goto end; if (!BN_sub_word(t, 1)) goto end; /* x = a*b*t */ if (!BN_mod_mul(x, A, b, p, ctx)) goto end; if (!BN_mod_mul(x, x, t, p, ctx)) goto end; if (!BN_copy(ret, x)) goto end; err = 0; goto vrfy; } /* * e > 2, so we really have to use the Tonelli/Shanks algorithm. First, * find some y that is not a square. */ if (!BN_copy(q, p)) goto end; /* use 'q' as temp */ q->neg = 0; i = 2; do { /* * For efficiency, try small numbers first; if this fails, try random * numbers. */ if (i < 22) { if (!BN_set_word(y, i)) goto end; } else { if (!BN_priv_rand_ex(y, BN_num_bits(p), 0, 0, 0, ctx)) goto end; if (BN_ucmp(y, p) >= 0) { if (!(p->neg ? BN_add : BN_sub) (y, y, p)) goto end; } /* now 0 <= y < |p| */ if (BN_is_zero(y)) if (!BN_set_word(y, i)) goto end; } r = BN_kronecker(y, q, ctx); /* here 'q' is |p| */ if (r < -1) goto end; if (r == 0) { /* m divides p */ ERR_raise(ERR_LIB_BN, BN_R_P_IS_NOT_PRIME); goto end; } } while (r == 1 && ++i < 82); if (r != -1) { /* * Many rounds and still no non-square -- this is more likely a bug * than just bad luck. Even if p is not prime, we should have found * some y such that r == -1. */ ERR_raise(ERR_LIB_BN, BN_R_TOO_MANY_ITERATIONS); goto end; } /* Here's our actual 'q': */ if (!BN_rshift(q, q, e)) goto end; /* * Now that we have some non-square, we can find an element of order 2^e * by computing its q'th power. */ if (!BN_mod_exp(y, y, q, p, ctx)) goto end; if (BN_is_one(y)) { ERR_raise(ERR_LIB_BN, BN_R_P_IS_NOT_PRIME); goto end; } /*- * Now we know that (if p is indeed prime) there is an integer * k, 0 <= k < 2^e, such that * * a^q * y^k == 1 (mod p). * * As a^q is a square and y is not, k must be even. * q+1 is even, too, so there is an element * * X := a^((q+1)/2) * y^(k/2), * * and it satisfies * * X^2 = a^q * a * y^k * = a, * * so it is the square root that we are looking for. */ /* t := (q-1)/2 (note that q is odd) */ if (!BN_rshift1(t, q)) goto end; /* x := a^((q-1)/2) */ if (BN_is_zero(t)) { /* special case: p = 2^e + 1 */ if (!BN_nnmod(t, A, p, ctx)) goto end; if (BN_is_zero(t)) { /* special case: a == 0 (mod p) */ BN_zero(ret); err = 0; goto end; } else if (!BN_one(x)) goto end; } else { if (!BN_mod_exp(x, A, t, p, ctx)) goto end; if (BN_is_zero(x)) { /* special case: a == 0 (mod p) */ BN_zero(ret); err = 0; goto end; } } /* b := a*x^2 (= a^q) */ if (!BN_mod_sqr(b, x, p, ctx)) goto end; if (!BN_mod_mul(b, b, A, p, ctx)) goto end; /* x := a*x (= a^((q+1)/2)) */ if (!BN_mod_mul(x, x, A, p, ctx)) goto end; while (1) { /*- * Now b is a^q * y^k for some even k (0 <= k < 2^E * where E refers to the original value of e, which we * don't keep in a variable), and x is a^((q+1)/2) * y^(k/2). * * We have a*b = x^2, * y^2^(e-1) = -1, * b^2^(e-1) = 1. */ if (BN_is_one(b)) { if (!BN_copy(ret, x)) goto end; err = 0; goto vrfy; } /* Find the smallest i, 0 < i < e, such that b^(2^i) = 1. */ for (i = 1; i < e; i++) { if (i == 1) { if (!BN_mod_sqr(t, b, p, ctx)) goto end; } else { if (!BN_mod_mul(t, t, t, p, ctx)) goto end; } if (BN_is_one(t)) break; } /* If not found, a is not a square or p is not prime. */ if (i >= e) { ERR_raise(ERR_LIB_BN, BN_R_NOT_A_SQUARE); goto end; } /* t := y^2^(e - i - 1) */ if (!BN_copy(t, y)) goto end; for (j = e - i - 1; j > 0; j--) { if (!BN_mod_sqr(t, t, p, ctx)) goto end; } if (!BN_mod_mul(y, t, t, p, ctx)) goto end; if (!BN_mod_mul(x, x, t, p, ctx)) goto end; if (!BN_mod_mul(b, b, y, p, ctx)) goto end; e = i; } vrfy: if (!err) { /* * verify the result -- the input might have been not a square (test * added in 0.9.8) */ if (!BN_mod_sqr(x, ret, p, ctx)) err = 1; if (!err && 0 != BN_cmp(x, A)) { ERR_raise(ERR_LIB_BN, BN_R_NOT_A_SQUARE); err = 1; } } end: if (err) { if (ret != in) BN_clear_free(ret); ret = NULL; } if (used_ctx) BN_CTX_end(ctx); bn_check_top(ret); return ret; }

void loongarch_cpu_dump_state(CPUState *cs, FILE *f, int flags) { LoongArchCPU *cpu = LOONGARCH_CPU(cs); CPULoongArchState *env = &cpu->env; int i; qemu_fprintf(f, " PC=%016" PRIx64 " ", env->pc); qemu_fprintf(f, " FCSR0 0x%08x fp_status 0x%02x\n", env->fcsr0, get_float_exception_flags(&env->fp_status)); /* gpr */ for (i = 0; i < 32; i++) { if ((i & 3) == 0) { qemu_fprintf(f, " GPR%02d:", i); } qemu_fprintf(f, " %s %016" PRIx64, regnames[i], env->gpr[i]); if ((i & 3) == 3) { qemu_fprintf(f, "\n"); } } qemu_fprintf(f, "CRMD=%016" PRIx64 "\n", env->CSR_CRMD); qemu_fprintf(f, "PRMD=%016" PRIx64 "\n", env->CSR_PRMD); qemu_fprintf(f, "EUEN=%016" PRIx64 "\n", env->CSR_EUEN); qemu_fprintf(f, "ESTAT=%016" PRIx64 "\n", env->CSR_ESTAT); qemu_fprintf(f, "ERA=%016" PRIx64 "\n", env->CSR_ERA); qemu_fprintf(f, "BADV=%016" PRIx64 "\n", env->CSR_BADV); qemu_fprintf(f, "BADI=%016" PRIx64 "\n", env->CSR_BADI); qemu_fprintf(f, "EENTRY=%016" PRIx64 "\n", env->CSR_EENTRY); qemu_fprintf(f, "PRCFG1=%016" PRIx64 ", PRCFG2=%016" PRIx64 "," " PRCFG3=%016" PRIx64 "\n", env->CSR_PRCFG1, env->CSR_PRCFG3, env->CSR_PRCFG3); qemu_fprintf(f, "TLBRENTRY=%016" PRIx64 "\n", env->CSR_TLBRENTRY); qemu_fprintf(f, "TLBRBADV=%016" PRIx64 "\n", env->CSR_TLBRBADV); qemu_fprintf(f, "TLBRERA=%016" PRIx64 "\n", env->CSR_TLBRERA); /* fpr */ if (flags & CPU_DUMP_FPU) { for (i = 0; i < 32; i++) { qemu_fprintf(f, " %s %016" PRIx64, fregnames[i], env->fpr[i]); if ((i & 3) == 3) { qemu_fprintf(f, "\n"); } } } }

static void loongarch_cpu_do_interrupt(CPUState *cs) { LoongArchCPU *cpu = LOONGARCH_CPU(cs); CPULoongArchState *env = &cpu->env; bool update_badinstr = 1; int cause = -1; const char *name; bool tlbfill = FIELD_EX64(env->CSR_TLBRERA, CSR_TLBRERA, ISTLBR); uint32_t vec_size = FIELD_EX64(env->CSR_ECFG, CSR_ECFG, VS); if (cs->exception_index != EXCCODE_INT) { if (cs->exception_index < 0 || cs->exception_index > ARRAY_SIZE(excp_names)) { name = "unknown"; } else { name = excp_names[cs->exception_index]; } qemu_log_mask(CPU_LOG_INT, "%s enter: pc " TARGET_FMT_lx " ERA " TARGET_FMT_lx " TLBRERA " TARGET_FMT_lx " %s exception\n", __func__, env->pc, env->CSR_ERA, env->CSR_TLBRERA, name); } switch (cs->exception_index) { case EXCCODE_DBP: env->CSR_DBG = FIELD_DP64(env->CSR_DBG, CSR_DBG, DCL, 1); env->CSR_DBG = FIELD_DP64(env->CSR_DBG, CSR_DBG, ECODE, 0xC); goto set_DERA; set_DERA: env->CSR_DERA = env->pc; env->CSR_DBG = FIELD_DP64(env->CSR_DBG, CSR_DBG, DST, 1); env->pc = env->CSR_EENTRY + 0x480; break; case EXCCODE_INT: if (FIELD_EX64(env->CSR_DBG, CSR_DBG, DST)) { env->CSR_DBG = FIELD_DP64(env->CSR_DBG, CSR_DBG, DEI, 1); goto set_DERA; } QEMU_FALLTHROUGH; case EXCCODE_PIF: cause = cs->exception_index; update_badinstr = 0; break; case EXCCODE_SYS: case EXCCODE_BRK: case EXCCODE_INE: case EXCCODE_IPE: case EXCCODE_FPE: case EXCCODE_BCE: env->CSR_BADV = env->pc; QEMU_FALLTHROUGH; case EXCCODE_ADEM: case EXCCODE_PIL: case EXCCODE_PIS: case EXCCODE_PME: case EXCCODE_PNR: case EXCCODE_PNX: case EXCCODE_PPI: cause = cs->exception_index; break; default: qemu_log("Error: exception(%d) '%s' has not been supported\n", cs->exception_index, excp_names[cs->exception_index]); abort(); } if (update_badinstr) { env->CSR_BADI = cpu_ldl_code(env, env->pc); } /* Save PLV and IE */ if (tlbfill) { env->CSR_TLBRPRMD = FIELD_DP64(env->CSR_TLBRPRMD, CSR_TLBRPRMD, PPLV, FIELD_EX64(env->CSR_CRMD, CSR_CRMD, PLV)); env->CSR_TLBRPRMD = FIELD_DP64(env->CSR_TLBRPRMD, CSR_TLBRPRMD, PIE, FIELD_EX64(env->CSR_CRMD, CSR_CRMD, IE)); /* set the DA mode */ env->CSR_CRMD = FIELD_DP64(env->CSR_CRMD, CSR_CRMD, DA, 1); env->CSR_CRMD = FIELD_DP64(env->CSR_CRMD, CSR_CRMD, PG, 0); env->CSR_TLBRERA = FIELD_DP64(env->CSR_TLBRERA, CSR_TLBRERA, PC, (env->pc >> 2)); } else { env->CSR_ESTAT = FIELD_DP64(env->CSR_ESTAT, CSR_ESTAT, ECODE, cause); env->CSR_PRMD = FIELD_DP64(env->CSR_PRMD, CSR_PRMD, PPLV, FIELD_EX64(env->CSR_CRMD, CSR_CRMD, PLV)); env->CSR_PRMD = FIELD_DP64(env->CSR_PRMD, CSR_PRMD, PIE, FIELD_EX64(env->CSR_CRMD, CSR_CRMD, IE)); env->CSR_ERA = env->pc; } env->CSR_CRMD = FIELD_DP64(env->CSR_CRMD, CSR_CRMD, PLV, 0); env->CSR_CRMD = FIELD_DP64(env->CSR_CRMD, CSR_CRMD, IE, 0); if (vec_size) { vec_size = (1 << vec_size) * 4; } if (cs->exception_index == EXCCODE_INT) { /* Interrupt */ uint32_t vector = 0; uint32_t pending = FIELD_EX64(env->CSR_ESTAT, CSR_ESTAT, IS); pending &= FIELD_EX64(env->CSR_ECFG, CSR_ECFG, LIE); /* Find the highest-priority interrupt. */ vector = 31 - clz32(pending); env->pc = env->CSR_EENTRY + (EXCCODE_EXTERNAL_INT + vector) * vec_size; qemu_log_mask(CPU_LOG_INT, "%s: PC " TARGET_FMT_lx " ERA " TARGET_FMT_lx " cause %d\n" " A " TARGET_FMT_lx " D " TARGET_FMT_lx " vector = %d ExC " TARGET_FMT_lx "ExS" TARGET_FMT_lx "\n", __func__, env->pc, env->CSR_ERA, cause, env->CSR_BADV, env->CSR_DERA, vector, env->CSR_ECFG, env->CSR_ESTAT); } else { if (tlbfill) { env->pc = env->CSR_TLBRENTRY; } else { env->pc = env->CSR_EENTRY; env->pc += cause * vec_size; } qemu_log_mask(CPU_LOG_INT, "%s: PC " TARGET_FMT_lx " ERA " TARGET_FMT_lx " cause %d%s\n, ESTAT " TARGET_FMT_lx " EXCFG " TARGET_FMT_lx " BADVA " TARGET_FMT_lx "BADI " TARGET_FMT_lx " SYS_NUM " TARGET_FMT_lu " cpu %d asid " TARGET_FMT_lx "\n", __func__, env->pc, tlbfill ? env->CSR_TLBRERA : env->CSR_ERA, cause, tlbfill ? "(refill)" : "", env->CSR_ESTAT, env->CSR_ECFG, tlbfill ? env->CSR_TLBRBADV : env->CSR_BADV, env->CSR_BADI, env->gpr[11], cs->cpu_index, env->CSR_ASID); } cs->exception_index = -1; }

static void loongarch_cpu_class_init(ObjectClass *c, void *data) { LoongArchCPUClass *lacc = LOONGARCH_CPU_CLASS(c); CPUClass *cc = CPU_CLASS(c); DeviceClass *dc = DEVICE_CLASS(c); device_class_set_parent_realize(dc, loongarch_cpu_realizefn, &lacc->parent_realize); device_class_set_parent_reset(dc, loongarch_cpu_reset, &lacc->parent_reset); cc->class_by_name = loongarch_cpu_class_by_name; cc->has_work = loongarch_cpu_has_work; cc->dump_state = loongarch_cpu_dump_state; cc->set_pc = loongarch_cpu_set_pc; #ifndef CONFIG_USER_ONLY dc->vmsd = &vmstate_loongarch_cpu; cc->sysemu_ops = &loongarch_sysemu_ops; #endif cc->disas_set_info = loongarch_cpu_disas_set_info; cc->gdb_read_register = loongarch_cpu_gdb_read_register; cc->gdb_write_register = loongarch_cpu_gdb_write_register; cc->disas_set_info = loongarch_cpu_disas_set_info; cc->gdb_num_core_regs = 34; cc->gdb_core_xml_file = "loongarch-base64.xml"; cc->gdb_stop_before_watchpoint = true; #ifdef CONFIG_TCG cc->tcg_ops = &loongarch_tcg_ops; #endif }

void G_NORETURN do_raise_exception(CPULoongArchState *env, uint32_t exception, uintptr_t pc) { CPUState *cs = env_cpu(env); qemu_log_mask(CPU_LOG_INT, "%s: %d (%s)\n", __func__, exception, loongarch_exception_name(exception)); cs->exception_index = exception; cpu_loop_exit_restore(cs, pc); }

static void loongarch_cpu_list_entry(gpointer data, gpointer user_data) { const char *typename = object_class_get_name(OBJECT_CLASS(data)); qemu_printf("%s\n", typename); }

const char *loongarch_exception_name(int32_t exception) { assert(excp_names[exception]); return excp_names[exception]; }

static void loongarch_cpu_disas_set_info(CPUState *s, disassemble_info *info) { info->print_insn = print_insn_loongarch; }

void loongarch_cpu_set_irq(void *opaque, int irq, int level) { LoongArchCPU *cpu = opaque; CPULoongArchState *env = &cpu->env; CPUState *cs = CPU(cpu); if (irq < 0 || irq >= N_IRQS) { return; } env->CSR_ESTAT = deposit64(env->CSR_ESTAT, irq, 1, level != 0); if (FIELD_EX64(env->CSR_ESTAT, CSR_ESTAT, IS)) { cpu_interrupt(cs, CPU_INTERRUPT_HARD); } else { cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD); } }

static void loongarch_cpu_reset(DeviceState *dev) { CPUState *cs = CPU(dev); LoongArchCPU *cpu = LOONGARCH_CPU(cs); LoongArchCPUClass *lacc = LOONGARCH_CPU_GET_CLASS(cpu); CPULoongArchState *env = &cpu->env; lacc->parent_reset(dev); env->fcsr0_mask = FCSR0_M1 | FCSR0_M2 | FCSR0_M3; env->fcsr0 = 0x0; int n; /* Set csr registers value after reset */ env->CSR_CRMD = FIELD_DP64(env->CSR_CRMD, CSR_CRMD, PLV, 0); env->CSR_CRMD = FIELD_DP64(env->CSR_CRMD, CSR_CRMD, IE, 0); env->CSR_CRMD = FIELD_DP64(env->CSR_CRMD, CSR_CRMD, DA, 1); env->CSR_CRMD = FIELD_DP64(env->CSR_CRMD, CSR_CRMD, PG, 0); env->CSR_CRMD = FIELD_DP64(env->CSR_CRMD, CSR_CRMD, DATF, 1); env->CSR_CRMD = FIELD_DP64(env->CSR_CRMD, CSR_CRMD, DATM, 1); env->CSR_EUEN = FIELD_DP64(env->CSR_EUEN, CSR_EUEN, FPE, 0); env->CSR_EUEN = FIELD_DP64(env->CSR_EUEN, CSR_EUEN, SXE, 0); env->CSR_EUEN = FIELD_DP64(env->CSR_EUEN, CSR_EUEN, ASXE, 0); env->CSR_EUEN = FIELD_DP64(env->CSR_EUEN, CSR_EUEN, BTE, 0); env->CSR_MISC = 0; env->CSR_ECFG = FIELD_DP64(env->CSR_ECFG, CSR_ECFG, VS, 0); env->CSR_ECFG = FIELD_DP64(env->CSR_ECFG, CSR_ECFG, LIE, 0); env->CSR_ESTAT = env->CSR_ESTAT & (~MAKE_64BIT_MASK(0, 2)); env->CSR_RVACFG = FIELD_DP64(env->CSR_RVACFG, CSR_RVACFG, RBITS, 0); env->CSR_TCFG = FIELD_DP64(env->CSR_TCFG, CSR_TCFG, EN, 0); env->CSR_LLBCTL = FIELD_DP64(env->CSR_LLBCTL, CSR_LLBCTL, KLO, 0); env->CSR_TLBRERA = FIELD_DP64(env->CSR_TLBRERA, CSR_TLBRERA, ISTLBR, 0); env->CSR_MERRCTL = FIELD_DP64(env->CSR_MERRCTL, CSR_MERRCTL, ISMERR, 0); env->CSR_PRCFG3 = FIELD_DP64(env->CSR_PRCFG3, CSR_PRCFG3, TLB_TYPE, 2); env->CSR_PRCFG3 = FIELD_DP64(env->CSR_PRCFG3, CSR_PRCFG3, MTLB_ENTRY, 63); env->CSR_PRCFG3 = FIELD_DP64(env->CSR_PRCFG3, CSR_PRCFG3, STLB_WAYS, 7); env->CSR_PRCFG3 = FIELD_DP64(env->CSR_PRCFG3, CSR_PRCFG3, STLB_SETS, 8); for (n = 0; n < 4; n++) { env->CSR_DMW[n] = FIELD_DP64(env->CSR_DMW[n], CSR_DMW, PLV0, 0); env->CSR_DMW[n] = FIELD_DP64(env->CSR_DMW[n], CSR_DMW, PLV1, 0); env->CSR_DMW[n] = FIELD_DP64(env->CSR_DMW[n], CSR_DMW, PLV2, 0); env->CSR_DMW[n] = FIELD_DP64(env->CSR_DMW[n], CSR_DMW, PLV3, 0); } #ifndef CONFIG_USER_ONLY env->pc = 0x1c000000; memset(env->tlb, 0, sizeof(env->tlb)); #endif restore_fp_status(env); cs->exception_index = -1; }

static void loongarch_cpu_set_pc(CPUState *cs, vaddr value) { LoongArchCPU *cpu = LOONGARCH_CPU(cs); CPULoongArchState *env = &cpu->env; env->pc = value; }

static void loongarch_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr, vaddr addr, unsigned size, MMUAccessType access_type, int mmu_idx, MemTxAttrs attrs, MemTxResult response, uintptr_t retaddr) { LoongArchCPU *cpu = LOONGARCH_CPU(cs); CPULoongArchState *env = &cpu->env; if (access_type == MMU_INST_FETCH) { do_raise_exception(env, EXCCODE_ADEF, retaddr); } else { do_raise_exception(env, EXCCODE_ADEM, retaddr); } }

static inline bool cpu_loongarch_hw_interrupts_enabled(CPULoongArchState *env) { bool ret = 0; ret = (FIELD_EX64(env->CSR_CRMD, CSR_CRMD, IE) && !(FIELD_EX64(env->CSR_DBG, CSR_DBG, DST))); return ret; }