+++ /dev/null
-/*
- * Copyright (c) 2011-2014 Apple Inc. All Rights Reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-
-#include <xpc/private.h>
-#include <syslog.h>
-#include <sys/param.h>
-#include <sandbox.h>
-#include <dlfcn.h>
-#include <sysexits.h>
-#include <Security/Security.h>
-#include <stdlib.h>
-#include <libgen.h>
-#include <string.h>
-#include <CommonCrypto/CommonDigest.h>
-#include <CoreFoundation/CoreFoundation.h>
-#include <sys/types.h>
-#include <pwd.h>
-
-struct connection_info {
- xpc_connection_t peer;
- int processed;
- int done;
-};
-
-typedef typeof(SecKeychainCopyDomainSearchList) SecKeychainCopyDomainSearchListType;
-SecKeychainCopyDomainSearchListType *SecKeychainCopyDomainSearchListFunctionPointer = NULL;
-typedef typeof(SecKeychainGetPath) SecKeychainGetPathType;
-SecKeychainGetPathType *SecKeychainGetPathFunctionPointer = NULL;
-
-// prior to 8723022 we have to do our own idle timeout work
-#ifndef XPC_HANDLES_IDLE_TIMEOUT
-int current_connections = 0;
-// Number of seconds to sit with no clients
-#define IDLE_WAIT_TIME 30
-#endif
-
-xpc_object_t keychain_prefs_path = NULL;
-xpc_object_t home = NULL;
-
-extern xpc_object_t
-xpc_create_reply_with_format(xpc_object_t original, const char * format, ...);
-
-static
-xpc_object_t create_keychain_search_list_for(xpc_connection_t peer, SecPreferencesDomain domain)
-{
- CFArrayRef keychains = NULL;
- pid_t peer_pid = xpc_connection_get_pid(peer);
- OSStatus status = SecKeychainCopyDomainSearchListFunctionPointer(domain, &keychains);
- if (errSecSuccess != status) {
- syslog(LOG_ERR, "Unable to get keychain search list (domain=%d) on behalf of %d, status=0x%lx", domain, peer_pid, (unsigned long)status);
- return NULL;
- }
-
- xpc_object_t paths = xpc_array_create(NULL, 0);
- CFIndex n_keychains = CFArrayGetCount(keychains);
- CFIndex i;
- for(i = 0; i < n_keychains; i++) {
- char path[MAXPATHLEN];
-
- SecKeychainRef keychain = (SecKeychainRef)CFArrayGetValueAtIndex(keychains, i);
- UInt32 length = MAXPATHLEN;
- OSStatus status = SecKeychainGetPathFunctionPointer(keychain, &length, path);
- if (errSecSuccess != status) {
- syslog(LOG_ERR, "Unable to get path for keychain#%ld of %ld on behalf of %d, status=0x%lx", i, n_keychains, peer_pid, (unsigned long)status);
- continue;
- }
- xpc_object_t path_as_xpc_string = xpc_string_create(path);
- xpc_array_append_value(paths, path_as_xpc_string);
- xpc_release(path_as_xpc_string);
- }
- CFRelease(keychains);
- return paths;
-}
-
-static
-bool keychain_domain_needs_writes(const char *domain_name)
-{
- return (0 == strcmp("kSecPreferencesDomainUser", domain_name) || 0 == strcmp("kSecPreferencesDomainDynamic", domain_name));
-}
-
-static
-void _set_keychain_search_lists_for_domain(xpc_connection_t peer, xpc_object_t all_domains, char *domain_name, SecPreferencesDomain domain_enum)
-{
- xpc_object_t keychains_for_domain = create_keychain_search_list_for(peer, domain_enum);
- if (keychains_for_domain) {
- xpc_dictionary_set_value(all_domains, domain_name, keychains_for_domain);
- xpc_release(keychains_for_domain);
- } else {
- syslog(LOG_ERR, "Can't discover keychain paths for domain %s on behalf of %d", domain_name, xpc_connection_get_pid(peer));
- }
-}
-
-#define SET_KEYCHAIN_SEARCH_LISTS_FOR_DOMAIN(peer, all_domains, domain) _set_keychain_search_lists_for_domain(peer, all_domains, #domain, domain);
-
-static
-xpc_object_t create_keychain_search_lists(xpc_connection_t peer)
-{
- xpc_object_t all_domains = xpc_dictionary_create(NULL, NULL, 0);
-
- SET_KEYCHAIN_SEARCH_LISTS_FOR_DOMAIN(peer, all_domains, kSecPreferencesDomainUser);
- SET_KEYCHAIN_SEARCH_LISTS_FOR_DOMAIN(peer, all_domains, kSecPreferencesDomainSystem);
- SET_KEYCHAIN_SEARCH_LISTS_FOR_DOMAIN(peer, all_domains, kSecPreferencesDomainCommon);
- SET_KEYCHAIN_SEARCH_LISTS_FOR_DOMAIN(peer, all_domains, kSecPreferencesDomainDynamic);
-
- return all_domains;
-}
-
-
-static
-xpc_object_t create_keychain_and_lock_paths(xpc_connection_t peer, xpc_object_t keychain_path_dict)
-{
- pid_t peer_pid = xpc_connection_get_pid(peer);
- char *assembly_queue_label = NULL;
- asprintf(&assembly_queue_label, "assembly-for-%d", peer_pid);
- if (!assembly_queue_label) {
- syslog(LOG_ERR, "Unable to create assembly queue label for %d", peer_pid);
- return NULL;
- }
- dispatch_queue_t assembly_queue = dispatch_queue_create(assembly_queue_label, 0);
- free(assembly_queue_label);
- if (!assembly_queue) {
- syslog(LOG_ERR, "Unable to create assembly queue for %d", peer_pid);
- return NULL;
- }
- xpc_object_t return_paths_dict = xpc_dictionary_create(NULL, NULL, 0);
-
- xpc_dictionary_apply(keychain_path_dict, ^(const char *keychain_domain, xpc_object_t keychain_path_array) {
- xpc_object_t return_paths_array = xpc_array_create(NULL, 0);
- dispatch_apply(xpc_array_get_count(keychain_path_array), dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(size_t i) {
- xpc_object_t path_as_xpc_string = xpc_array_get_value(keychain_path_array, i);
- dispatch_sync(assembly_queue, ^{
- xpc_array_append_value(return_paths_array, path_as_xpc_string);
- });
-
- if (!keychain_domain_needs_writes(keychain_domain)) {
- // lock files are only to prevent write-write errors, readers don't hold locks, so they don't need the lock files
- return;
- }
-
- // figure out the base and dir
- const char* path = xpc_array_get_string(keychain_path_array, i);
- char* dir;
- char* base;
-
- char buffer[PATH_MAX];
- strcpy(buffer, path);
-
- if (path != NULL) {
- ptrdiff_t i = strlen(buffer) - 1;
- while (i >= 0 && buffer[i] != '/') {
- i -= 1;
- }
-
- if (i >= 0) {
- // NULL terminate the dir
- buffer[i] = 0;
- dir = buffer;
- base = buffer + i + 1;
- } else {
- dir = NULL;
- base = buffer;
- }
- }
-
- if (!(path && dir && base)) {
- syslog(LOG_ERR, "Can't get dir or base (likely out of memory) for %s", xpc_array_get_string(keychain_path_array, i));
- return;
- }
-
- // "network style" lock files
- path_as_xpc_string = xpc_string_create_with_format("%s/lck~%s", dir, base);
- dispatch_sync(assembly_queue, ^{
- xpc_array_append_value(return_paths_array, path_as_xpc_string);
- });
- xpc_release(path_as_xpc_string);
-
- CC_SHA1_CTX sha1Context;
- CC_SHA1_Init(&sha1Context);
- CC_SHA1_Update(&sha1Context, base, (CC_LONG)strlen(base));
-
- unsigned char sha1_result_bytes[CC_SHA1_DIGEST_LENGTH];
-
- CC_SHA1_Final(sha1_result_bytes, &sha1Context);
-
- path_as_xpc_string = xpc_string_create_with_format("%s/.fl%02X%02X%02X%02X", dir, sha1_result_bytes[0], sha1_result_bytes[1], sha1_result_bytes[2], sha1_result_bytes[3]);
- dispatch_sync(assembly_queue, ^{
- xpc_array_append_value(return_paths_array, path_as_xpc_string);
- });
- });
- xpc_dictionary_set_value(return_paths_dict, keychain_domain, return_paths_array);
- xpc_release(return_paths_array);
- return (bool)true;
- });
-
- dispatch_release(assembly_queue);
- return return_paths_dict;
-}
-
-static
-xpc_object_t create_one_sandbox_extension(xpc_object_t path, uint64_t extension_flags)
-{
- char *sandbox_extension = NULL;
- int status = sandbox_issue_fs_extension(xpc_string_get_string_ptr(path), extension_flags, &sandbox_extension);
- if (0 == status && sandbox_extension) {
- xpc_object_t sandbox_extension_as_xpc_string = xpc_string_create(sandbox_extension);
- free(sandbox_extension);
- return sandbox_extension_as_xpc_string;
- } else {
- syslog(LOG_ERR, "Can't get sandbox fs extension for %s, status=%d errno=%m ext=%s", xpc_string_get_string_ptr(path), status, sandbox_extension);
- }
- return NULL;
-}
-
-static
-xpc_object_t create_all_sandbox_extensions(xpc_object_t path_dict)
-{
- xpc_object_t extensions = xpc_array_create(NULL, 0);
-
- xpc_object_t sandbox_extension = create_one_sandbox_extension(keychain_prefs_path, FS_EXT_FOR_PATH|FS_EXT_READ);
- if (sandbox_extension) {
- xpc_array_append_value(extensions, sandbox_extension);
- xpc_release(sandbox_extension);
- }
-
- xpc_dictionary_apply(path_dict, ^(const char *keychain_domain, xpc_object_t path_array) {
- uint64_t extension_flags = FS_EXT_FOR_PATH|FS_EXT_READ;
- if (keychain_domain_needs_writes(keychain_domain)) {
- extension_flags = FS_EXT_FOR_PATH|FS_EXT_READ|FS_EXT_WRITE;
- }
- xpc_array_apply(path_array, ^(size_t index, xpc_object_t path) {
- xpc_object_t sandbox_extension = create_one_sandbox_extension(path, extension_flags);
- if (sandbox_extension) {
- xpc_array_append_value(extensions, sandbox_extension);
- xpc_release(sandbox_extension);
- }
- return (bool)true;
- });
- return (bool)true;
- });
-
- return extensions;
-}
-
-static
-void handle_request_event(struct connection_info *info, xpc_object_t event)
-{
- xpc_connection_t peer = xpc_dictionary_get_connection(event);
- xpc_type_t xtype = xpc_get_type(event);
- if (info->done) {
- syslog(LOG_ERR, "event %p while done", event);
- return;
- }
- if (xtype == XPC_TYPE_ERROR) {
- if (event == XPC_ERROR_TERMINATION_IMMINENT) {
- // launchd would like us to die, but we have open transactions. When we finish with them xpc_service_main
- // will exit for us, so there is nothing for us to do here.
- return;
- }
-
- if (!info->done) {
- info->done = true;
- xpc_release(info->peer);
-#ifndef XPC_HANDLES_IDLE_TIMEOUT
- if (0 == __sync_add_and_fetch(¤t_connections, -1)) {
- dispatch_after(dispatch_time(DISPATCH_TIME_NOW, NSEC_PER_SEC * IDLE_WAIT_TIME), dispatch_get_main_queue(), ^(void) {
- if (0 == current_connections) {
- exit(0);
- }
- });
- }
-#endif
- }
- if (peer == NULL && XPC_ERROR_CONNECTION_INVALID == event && 0 != info->processed) {
- // this is a normal shutdown on a connection that has processed at least
- // one request. Nothing intresting to log.
- return;
- }
- syslog(LOG_ERR, "listener event error (connection %p): %s", peer, xpc_dictionary_get_string(event, XPC_ERROR_KEY_DESCRIPTION));
- } else if (xtype == XPC_TYPE_DICTIONARY) {
- const char *operation = xpc_dictionary_get_string(event, "op");
- if (operation && !strcmp(operation, "GrantKeychainPaths")) {
- xpc_object_t keychain_paths = create_keychain_search_lists(peer);
- xpc_object_t all_paths = create_keychain_and_lock_paths(peer, keychain_paths);
- xpc_object_t sandbox_extensions = NULL;
- if (all_paths) {
- sandbox_extensions = create_all_sandbox_extensions(all_paths);
- }
-
- xpc_object_t reply = xpc_create_reply_with_format(event, "{keychain-paths: %value, all-paths: %value, extensions: %value, keychain-home: %value}",
- keychain_paths, all_paths, sandbox_extensions, home);
- xpc_connection_send_message(peer, reply);
- xpc_release(reply);
- if (keychain_paths) {
- xpc_release(keychain_paths);
- }
- if (all_paths) {
- xpc_release(all_paths);
- }
- if (sandbox_extensions) {
- xpc_release(sandbox_extensions);
- }
- if (INT32_MAX != info->processed) {
- info->processed++;
- }
- } else {
- syslog(LOG_ERR, "Unknown op=%s request from pid %d", operation, xpc_connection_get_pid(peer));
- }
- } else {
- syslog(LOG_ERR, "Unhandled request event=%p type=%p", event, xtype);
- }
-}
-
-static
-void finalize_connection(void *not_used)
-{
-#ifdef XPC_HANDLES_IDLE_TIMEOUT
- xpc_transaction_end();
-#endif
-}
-
-static
-void handle_connection_event(const xpc_connection_t peer)
-{
-#ifndef XPC_HANDLES_IDLE_TIMEOUT
- __sync_add_and_fetch(¤t_connections, 1);
-#endif
- __block struct connection_info info;
- info.peer = peer;
- info.processed = 0;
- info.done = false;
-
- xpc_connection_set_event_handler(peer, ^(xpc_object_t event) {
- handle_request_event(&info, event);
- });
-
- // unlike dispatch objects xpc objects don't need a context set in order to run a finalizer. (we use our finalizer to
- // end the transaction we are about to begin...this keeps xpc from idle exiting us while we have a live connection)
- xpc_connection_set_finalizer_f(peer, finalize_connection);
-#ifdef XPC_HANDLES_IDLE_TIMEOUT
- xpc_transaction_begin();
-#endif
-
- // enable the peer connection to receive messages
- xpc_connection_resume(peer);
- xpc_retain(peer);
-}
-
-
-static const char* g_path_to_plist = "/Library/Preferences/com.apple.security.plist";
-
-
-
-int main(int argc, const char *argv[])
-{
- char *wait4debugger = getenv("WAIT4DEBUGGER");
- if (wait4debugger && !strcasecmp("YES", wait4debugger)) {
- syslog(LOG_ERR, "Waiting for debugger");
- kill(getpid(), SIGSTOP);
- }
-
- // get the home directory
- const char* home_dir = getenv("HOME");
-
- if (home_dir == NULL || strlen(home_dir) == 0) {
- struct passwd* pwd = getpwuid(getuid());
- home_dir = pwd->pw_dir; // look it up in directory services, sort of...
- }
-
- size_t home_dir_length = strlen(home_dir);
- size_t path_to_plist_length = strlen(g_path_to_plist);
-
- size_t total_length = home_dir_length + path_to_plist_length + 1; // compensate for terminating zero
- if (total_length > PATH_MAX) {
- // someone is spoofing us, just exit
- return -1;
- }
-
- // make storage for the real path
- char buffer[total_length];
- strlcpy(buffer, home_dir, total_length);
- strlcat(buffer, g_path_to_plist, total_length);
- keychain_prefs_path = xpc_string_create(buffer);
- home = xpc_string_create(home_dir);
-
- void *security_framework = dlopen("/System/Library/Frameworks/Security.framework/Security", RTLD_LAZY);
- if (security_framework) {
- SecKeychainCopyDomainSearchListFunctionPointer = dlsym(security_framework, "SecKeychainCopyDomainSearchList");
- if (!SecKeychainCopyDomainSearchListFunctionPointer) {
- syslog(LOG_ERR, "Can't lookup SecKeychainCopyDomainSearchList in %p: %s", security_framework, dlerror());
- return EX_OSERR;
- }
- SecKeychainGetPathFunctionPointer = dlsym(security_framework, "SecKeychainGetPath");
- if (!SecKeychainGetPathFunctionPointer) {
- syslog(LOG_ERR, "Can't lookup SecKeychainGetPath in %p: %s", security_framework, dlerror());
- return EX_OSERR;
- }
- }
-
- xpc_main(handle_connection_event);
-
- return EX_OSERR;
-}
projects / apple / security.git / blobdiff