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kextd_request.c
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kextd_request.c
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/*
* Copyright (c) 2000-2008 Apple Computer, 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 <CoreFoundation/CoreFoundation.h>
#include <Security/Authorization.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/IOKitServer.h>
#include <libc.h>
#include <mach/mach.h>
#include <mach/mach_host.h>
#include <mach/bootstrap.h>
#include <mach/kmod.h>
#include <notify.h>
#include <sys/proc_info.h>
#include <libproc.h>
#include <libgen.h>
#include <bsm/libbsm.h>
#include <servers/bootstrap.h> // bootstrap mach ports
#include <sandbox.h>
#include <esp.h>
#include <IOKit/kext/kextmanager_types.h>
#include <IOKit/kext/OSKext.h>
#include <IOKit/kext/OSKextPrivate.h>
#include <IOKit/kext/KextManagerPriv.h>
#include <System/libkern/kext_request_keys.h>
#include "kext_tools_util.h"
#include <bootfiles.h>
#include "fork_program.h"
#include "kextd_globals.h"
#include "paths.h"
#include "kextd_request.h"
#include "kextd_main.h"
#include "kextd_usernotification.h"
#include "kextd_mach.h" // mig-generated, not in project
#include "bootcaches.h"
#include "security.h"
#define setCrashLogMessage(m)
#define CRASH_INFO_KERNEL_KEXT_LOAD "kernel kext load request: id %s"
#define CRASH_INFO_KERNEL_KEXT_RESOURCE "kext resource request: %s from id %s"
#define CRASH_INFO_USER_KEXT_LOAD "user kext load request: %s"
#define CRASH_INFO_USER_KEXT_PATH "user kext path request: %s"
#define CRASH_INFO_USER_PROPERTY "user kext property request: %s"
kern_return_t sendPropertyValueResponse(
CFArrayRef propertyValues,
char ** xml_data_out,
int * xml_data_length);
void kextdProcessKernelLoadRequest(
CFDictionaryRef request);
void kextdProcessKernelResourceRequest(
CFDictionaryRef request);
kern_return_t kextdProcessUserLoadRequest(
CFDictionaryRef request,
uid_t remote_euid,
pid_t remote_pid);
static OSReturn checkNonrootLoadAllowed(
OSKextRef kext,
uid_t remote_euid,
pid_t remote_pid);
#pragma mark KextManager RPC routines & support
/*******************************************************************************
*******************************************************************************/
kern_return_t _kextmanager_path_for_bundle_id(
mach_port_t server,
kext_bundle_id_t bundle_id,
posix_path_t path, // PATH_MAX
OSReturn * kext_result)
{
kern_return_t result = kOSReturnSuccess;
CFStringRef kextID = NULL; // must release
OSKextRef theKext = NULL; // must release
CFURLRef kextURL = NULL; // do not release
CFURLRef absURL = NULL; // must release
char crashInfo[sizeof(CRASH_INFO_USER_KEXT_PATH) +
KMOD_MAX_NAME + PATH_MAX];
snprintf(crashInfo, sizeof(crashInfo), CRASH_INFO_USER_KEXT_PATH,
bundle_id);
setCrashLogMessage(crashInfo);
*kext_result = kOSReturnError;
path[0] = '\0';
OSKextLog(/* kext */ NULL,
kOSKextLogDebugLevel | kOSKextLogIPCFlag,
"Received client request for path to bundle %s.",
bundle_id);
kextID = CFStringCreateWithCString(kCFAllocatorDefault, bundle_id,
kCFStringEncodingUTF8);
if (!kextID) {
OSKextLogMemError();
*kext_result = kOSKextReturnNoMemory;
goto finish;
}
theKext = OSKextCreateWithIdentifier(kCFAllocatorDefault, kextID);
if (!theKext) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogIPCFlag,
"Kext %s not found for client path request.", bundle_id);
*kext_result = kOSKextReturnNotFound;
goto finish;
}
kextURL = OSKextGetURL(theKext);
if (!kextURL) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogIPCFlag,
"Kext %s found for client path request, but has no URL.", bundle_id);
goto finish;
}
absURL = CFURLCopyAbsoluteURL(kextURL);
if (!absURL) {
OSKextLogMemError();
*kext_result = kOSKextReturnNoMemory;
goto finish;
}
if (!CFURLGetFileSystemRepresentation(absURL, /* resolveToBase */ true,
(UInt8 *)path, PATH_MAX)) {
*kext_result = kOSKextReturnSerialization;
goto finish;
}
*kext_result = kOSReturnSuccess;
OSKextLog(/* kext */ NULL,
kOSKextLogDebugLevel | kOSKextLogIPCFlag,
"Returning path %s for identifier %s.", path, bundle_id);
finish:
SAFE_RELEASE(kextID);
SAFE_RELEASE(theKext);
SAFE_RELEASE(absURL);
setCrashLogMessage(NULL);
return result;
}
#pragma mark Loginwindow RPC routines & support
/*******************************************************************************
* This function is executed in the main thread after its run loop gets
* kicked by a client request.
*******************************************************************************/
kern_return_t _kextmanager_create_property_value_array(
mach_port_t server,
char * property_key,
char ** xml_data_out,
int * xml_data_length)
{
kern_return_t result = kOSReturnError;
CFStringRef propertyKey = NULL; // must release
CFArrayRef propertyValues = NULL; // must release
char crashInfo[sizeof(CRASH_INFO_USER_PROPERTY) +
KMOD_MAX_NAME + PATH_MAX];
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogGeneralFlag,
"Received client request for property value array.");
if (!xml_data_out || !xml_data_length) {
result = kOSKextReturnInvalidArgument;
goto finish;
}
*xml_data_length = 0;
*xml_data_out = NULL;
snprintf(crashInfo, sizeof(crashInfo), CRASH_INFO_USER_PROPERTY,
property_key);
setCrashLogMessage(crashInfo);
propertyKey = CFStringCreateWithCString(kCFAllocatorDefault, property_key,
kCFStringEncodingUTF8);
if (!propertyKey) {
OSKextLogMemError();
goto finish;
}
if (readSystemKextPropertyValues(propertyKey, gKernelArchInfo,
/* forceUpdate? */ FALSE, &propertyValues)) {
result = sendPropertyValueResponse(propertyValues,
xml_data_out, xml_data_length);
goto finish;
}
finish:
SAFE_RELEASE(propertyKey);
SAFE_RELEASE(propertyValues);
setCrashLogMessage(NULL);
OSKextFlushInfoDictionary(NULL /* all kexts */);
OSKextFlushLoadInfo(NULL /* all kexts */, /* flushDependencies */ true);
return result;
}
/*******************************************************************************
*******************************************************************************/
kern_return_t sendPropertyValueResponse(
CFArrayRef propertyValues,
char ** xml_data_out,
int * xml_data_length)
{
kern_return_t result = kOSReturnError;
CFDataRef plistData = NULL; // must release
CFErrorRef error = NULL; // must relase
plistData = CFPropertyListCreateData(kCFAllocatorDefault,
propertyValues, kCFPropertyListBinaryFormat_v1_0,
/* options */ 0,
&error);
if (!plistData) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"Can't create plist data for property value response.");
log_CFError(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
error);
goto finish;
}
*xml_data_length = (int)CFDataGetLength(plistData);
if (*xml_data_length) {
result = vm_allocate(mach_task_self(), (vm_address_t *)xml_data_out,
*xml_data_length, VM_FLAGS_ANYWHERE);
if (result != kOSReturnSuccess) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"vm_allocate() failed.");
goto finish;
}
memcpy(*xml_data_out, CFDataGetBytePtr(plistData), *xml_data_length);
}
finish:
SAFE_RELEASE(plistData);
SAFE_RELEASE(error);
return result;
}
#pragma mark Kernel Kext Requests
#define KEXTD_LOCKED() (_gKextutilLock ? true:false)
/*******************************************************************************
* Incoming MIG message from kernel to let us know we should fetch requests from
* it using kextd_process_kernel_requests().
*******************************************************************************/
kern_return_t svc_kextd_ping(mach_port_t mp __unused)
{
bool shutdownRequested = false;
if (KEXTD_LOCKED()) {
gKernelRequestsPending = true;
return kOSReturnSuccess;
} else {
shutdownRequested = kextd_process_kernel_requests();
if (shutdownRequested) {
CFRunLoopStop(CFRunLoopGetCurrent());
}
}
return kOSReturnSuccess;
}
/*******************************************************************************
*******************************************************************************/
bool kextd_process_kernel_requests(void)
{
CFArrayRef kernelRequests = NULL; // must release
Boolean loadNotificationReceived = false;
Boolean unloadNotificationReceived = false;
Boolean prelinkedKernelRequested = false;
Boolean shutdownRequested = false;
char * scratchCString = NULL; // must free
CFIndex count, i;
/* Stay in the while loop until _OSKextCopyKernelRequests() returns
* no more requests.
*/
while (1) {
SAFE_RELEASE_NULL(kernelRequests);
kernelRequests = _OSKextCopyKernelRequests();
if (!kernelRequests || !CFArrayGetCount(kernelRequests)) {
break;
}
count = CFArrayGetCount(kernelRequests);
for (i = 0; i < count; i++) {
CFDictionaryRef request = NULL; // do not release
CFStringRef predicate = NULL; // do not release
SAFE_FREE_NULL(scratchCString);
request = CFArrayGetValueAtIndex(kernelRequests, i);
predicate = request ? CFDictionaryGetValue(request,
CFSTR(kKextRequestPredicateKey)) : NULL;
if (!request) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogIPCFlag,
"Empty kernel request.");
continue;
}
if (!predicate) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogIPCFlag,
"No predicate in kernel request.");
continue;
}
/* Check the request predicate and process it or note it needs
* to be processed.
*/
if (CFEqual(predicate, CFSTR(kKextRequestPredicateRequestPrelink))) {
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogIPCFlag,
"Got prelink kernel request.");
prelinkedKernelRequested = true;
} else if (CFEqual(predicate, CFSTR(kKextRequestPredicateRequestKextdExit))) {
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogIPCFlag,
"Got exit request from kernel.");
shutdownRequested = true;
} else if (CFEqual(predicate, CFSTR(kKextRequestPredicateRequestLoad))) {
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogIPCFlag,
"Got load request from kernel.");
kextdProcessKernelLoadRequest(request);
} else if (CFEqual(predicate, CFSTR(kKextRequestPredicateLoadNotification))) {
/* We don't do anything with the kext identifier because notify(3)
* doesn't allow for an argument.
*/
loadNotificationReceived = true;
} else if (CFEqual(predicate, CFSTR(kKextRequestPredicateUnloadNotification))) {
/* We don't do anything with the kext identifier because notify(3)
* doesn't allow for an argument.
*/
unloadNotificationReceived = true;
} else if (CFEqual(predicate, CFSTR(kKextRequestPredicateRequestResource))) {
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogIPCFlag,
"Got resource file request from kernel.");
kextdProcessKernelResourceRequest(request);
} else {
scratchCString = createUTF8CStringForCFString(predicate);
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogIPCFlag,
"Unknown predicate%s%s in kernel request.",
scratchCString ? " " : "",
scratchCString ? scratchCString : "");
}
} /* for (i = 0; i < count; i++) */
} /* while (1) */
// finish:
if (prelinkedKernelRequested) {
Boolean readOnlyFS = FALSE;
struct statfs statfsBuffer;
/* If the statfs() fails we will forge ahead and try kextcache.
* Only if we know for sure it's read-only do we skip.
*/
if (statfs("/System/Library/Caches", &statfsBuffer) == 0) {
if (statfsBuffer.f_flags & MNT_RDONLY) {
readOnlyFS = TRUE;
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogFileAccessFlag,
"Skipping prelinked kernel build; read-only filesystem.");
}
}
if (!readOnlyFS) {
char * const kextcacheArgs[] = {
"/usr/sbin/kextcache",
"-F",
"-system-prelinked-kernel",
NULL };
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogGeneralFlag,
"Building prelinked kernel.");
(void)fork_program("/usr/sbin/kextcache",
kextcacheArgs,
/* waitFlag */ false);
}
}
if (loadNotificationReceived) {
notify_post(kOSKextLoadNotification);
}
if (unloadNotificationReceived) {
notify_post(kOSKextUnloadNotification);
}
gKernelRequestsPending = false;
SAFE_FREE(scratchCString);
SAFE_RELEASE(kernelRequests);
OSKextFlushInfoDictionary(NULL /* all kexts */);
OSKextFlushLoadInfo(NULL /* all kexts */, /* flushDependencies */ true);
return shutdownRequested;
}
/*******************************************************************************
* Kernel load request.
*******************************************************************************/
void
kextdProcessKernelLoadRequest(CFDictionaryRef request)
{
CFDictionaryRef requestArgs = NULL; // do not release
OSKextRef osKext = NULL; // do not release
OSReturn osLoadResult = kOSKextReturnNotFound;
CFArrayRef loadList = NULL; // must release
CFStringRef kextIdentifier = NULL; // do not release
char * kext_id = NULL; // must free
char crashInfo[sizeof(CRASH_INFO_KERNEL_KEXT_LOAD) + KMOD_MAX_NAME + PATH_MAX];
requestArgs = request ? CFDictionaryGetValue(request,
CFSTR(kKextRequestArgumentsKey)) : NULL;
kextIdentifier = requestArgs ? CFDictionaryGetValue(requestArgs,
CFSTR(kKextRequestArgumentBundleIdentifierKey)) : NULL;
if (!requestArgs) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"No arguments in kernel kext load request.");
goto finish;
}
if (!kextIdentifier) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"No kext ID in kernel kext load request.");
goto finish;
}
kext_id = createUTF8CStringForCFString(kextIdentifier);
if (!kext_id) {
// xxx - not much we can do here.
OSKextLogMemError();
goto finish;
}
snprintf(crashInfo, sizeof(crashInfo), CRASH_INFO_KERNEL_KEXT_LOAD,
kext_id);
setCrashLogMessage(crashInfo);
/* Read the extensions if necessary (also resets the release timer).
*/
readExtensions();
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"Kernel requests kext with id %s.", kext_id);
osKext = OSKextGetKextWithIdentifier(kextIdentifier);
if (!osKext) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"Kext id %s not found; removing personalities from kernel.", kext_id);
OSKextRemovePersonalitiesForIdentifierFromKernel(kextIdentifier);
goto finish;
}
/* xxx - under what circumstances should we remove personalities?
* xxx - if the request gets into the kernel and fails, OSKext.cpp
* xxx - removes them, but there can be other failures on the way....
*/
OSStatus sigResult = checkKextSignature(osKext, true, false);
if ( sigResult != 0 ) {
if ( isInvalidSignatureAllowed() ) {
CFStringRef myKextPath = NULL; // must release
myKextPath = copyKextPath(osKext);
OSKextLogCFString(NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag,
CFSTR("kext-dev-mode allowing invalid signature %ld 0x%02lX for kext \"%@\""),
(long)sigResult, (long)sigResult,
myKextPath ? myKextPath : CFSTR("Unknown"));
SAFE_RELEASE(myKextPath);
}
else {
CFStringRef myBundleID = NULL; // do not release
myBundleID = OSKextGetIdentifier(osKext);
OSKextLogCFString(NULL,
kOSKextLogErrorLevel |
kOSKextLogLoadFlag | kOSKextLogIPCFlag,
CFSTR("ERROR: invalid signature for %@, will not load"),
myBundleID ? myBundleID : CFSTR("Unknown"));
OSKextRemoveKextPersonalitiesFromKernel(osKext);
goto finish;
}
}
osLoadResult = OSKextLoad(osKext);
if (osLoadResult != kOSReturnSuccess) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"Load %s failed; removing personalities from kernel.", kext_id);
OSKextRemoveKextPersonalitiesFromKernel(osKext);
} else {
if (kOSReturnSuccess != IOCatalogueModuleLoaded(
kIOMasterPortDefault, kext_id)) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"Failed to notify IOCatalogue that %s loaded.",
kext_id);
} else {
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"Loaded %s and notified IOCatalogue.",
kext_id);
}
}
if (osLoadResult == kOSKextReturnAuthentication) {
loadList = OSKextCopyLoadList(osKext, /* needAll? */ false);
recordNonsecureKexts(loadList);
}
finish:
SAFE_RELEASE(loadList);
SAFE_FREE(kext_id);
setCrashLogMessage(NULL);
return;
}
/*******************************************************************************
* Kernel resource file request.
*******************************************************************************/
#define kDSStoreFilename ".DS_Store"
void
kextdProcessKernelResourceRequest(
CFDictionaryRef request)
{
CFDictionaryRef requestArgs = NULL; // do not release
OSKextRef osKext = NULL; // must release
CFDataRef resource = NULL; // must release
OSReturn requestResult = kOSKextReturnInvalidArgument;
CFStringRef kextIdentifier = NULL; // do not release
CFStringRef resourceName = NULL; // do not release
CFURLRef kextURL = NULL; // do not release
char * kextIdentifierCString = NULL; // must free
char * resourceNameCString = NULL; // must free
char kextPathCString[PATH_MAX];
char crashInfo[sizeof(CRASH_INFO_KERNEL_KEXT_RESOURCE) +
KMOD_MAX_NAME + PATH_MAX];
requestArgs = request ? CFDictionaryGetValue(request,
CFSTR(kKextRequestArgumentsKey)) : NULL;
kextIdentifier = requestArgs ? CFDictionaryGetValue(requestArgs,
CFSTR(kKextRequestArgumentBundleIdentifierKey)) : NULL;
resourceName = requestArgs ? CFDictionaryGetValue(requestArgs,
CFSTR(kKextRequestArgumentNameKey)) : NULL;
OSKextLog(/* kext */ NULL,
kOSKextLogDebugLevel | kOSKextLogIPCFlag,
"Request for resource.");
if (!requestArgs) {
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogIPCFlag,
"No arguments in kernel kext resource request.");
goto finish;
}
if (!kextIdentifier) {
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogIPCFlag,
"No kext ID in kernel kext resource request.");
goto finish;
}
if (!resourceName) {
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogIPCFlag,
"No resource name in kernel kext resource request.");
goto finish;
}
requestResult = kOSKextReturnNoMemory;
kextIdentifierCString = createUTF8CStringForCFString(kextIdentifier);
resourceNameCString = createUTF8CStringForCFString(resourceName);
if (!kextIdentifierCString || !resourceNameCString) {
// xxx - not much we can do here.
OSKextLogMemError();
goto finish;
}
snprintf(crashInfo, sizeof(crashInfo), CRASH_INFO_KERNEL_KEXT_RESOURCE,
resourceNameCString, kextIdentifierCString);
setCrashLogMessage(crashInfo);
if (CFEqual(resourceName, CFSTR(kDSStoreFilename))) {
requestResult = kOSKextReturnInvalidArgument;
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogIPCFlag | kOSKextLogFileAccessFlag,
"Request for %s resource by %s - not allowed.",
kDSStoreFilename, kextIdentifierCString);
goto finish;
}
/* Read the extensions if necessary (also resets the release timer).
*/
readExtensions();
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogIPCFlag,
"Kernel requests resource %s from kext id %s.",
resourceNameCString, kextIdentifierCString);
requestResult = kOSKextReturnNotFound;
osKext = OSKextCreateWithIdentifier(kCFAllocatorDefault, kextIdentifier);
if (!osKext) {
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogIPCFlag,
"Kext id %s not found; can't retrieve requested resource.",
kextIdentifierCString);
goto finish;
}
kextURL = OSKextGetURL(osKext);
if (!kextURL ||
!CFURLGetFileSystemRepresentation(kextURL, /* resolveToBase? */ TRUE,
(UInt8 *)kextPathCString, sizeof(kextPathCString))) {
strlcpy(kextPathCString, "(unknown)", sizeof("(unknown)"));
}
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogIPCFlag,
"Seeking resource %s in %s.",
resourceNameCString, kextPathCString);
if (!OSKextIsValid(osKext)) {
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogIPCFlag | kOSKextLogValidationFlag,
"%s is not valid; can't retrieve requested resource.",
kextPathCString);
requestResult = kOSKextReturnValidation;
goto finish;
}
if (!OSKextIsAuthentic(osKext)) {
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogIPCFlag | kOSKextLogAuthenticationFlag,
"%s has incorrect permissions; can't retrieve requested resource.",
kextPathCString);
requestResult = kOSKextReturnAuthentication;
goto finish;
}
resource = OSKextCopyResource(osKext, resourceName,
/* resourceType */ NULL);
if (!resource) {
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogIPCFlag | kOSKextLogFileAccessFlag,
"Can't find resource %s in %s.",
resourceNameCString, kextPathCString);
requestResult = kOSKextReturnNotFound;
goto finish;
}
requestResult = kOSReturnSuccess;
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogIPCFlag | kOSKextLogValidationFlag,
"Found resource %s in %s; sending to kernel.",
resourceNameCString, kextPathCString);
finish:
// now we send it to the kernel
(void) _OSKextSendResource(request, requestResult, resource);
SAFE_RELEASE(resource);
SAFE_RELEASE(osKext);
SAFE_FREE(kextIdentifierCString);
SAFE_FREE(resourceNameCString);
setCrashLogMessage(NULL);
return;
}
#pragma mark User Space Kext Load Requests
/*******************************************************************************
* User space load request.
*******************************************************************************/
kern_return_t
_kextmanager_load_kext(
mach_port_t server,
audit_token_t audit_token,
char * xml_data_in,
int xml_data_length)
{
OSReturn result = kOSReturnError;
CFDataRef requestData = NULL; // must release
CFDictionaryRef request = NULL; // must release
CFErrorRef error = NULL; // must release
pid_t remote_pid = -1;
uid_t remote_euid = -1;
requestData = CFDataCreateWithBytesNoCopy(kCFAllocatorDefault,
(const UInt8 *)xml_data_in, xml_data_length,
/* deallocator */ kCFAllocatorNull);
if (!requestData) {
OSKextLogMemError();
result = kOSKextReturnNoMemory;
goto finish;
}
request = CFPropertyListCreateWithData(kCFAllocatorDefault,
requestData, /* options */ 0, /* format */ NULL,
&error);
if (!request) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogIPCFlag,
"Can't read kext load request.");
log_CFError(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogIPCFlag,
error);
result = kOSKextReturnSerialization;
goto finish;
}
if (CFGetTypeID(request) != CFDictionaryGetTypeID()) {
result = kOSKextReturnBadData;
goto finish;
}
audit_token_to_au32(audit_token, /* audit UID */ NULL,
&remote_euid, /* egid */ NULL, /* ruid */ NULL, /* rgid */ NULL,
&remote_pid, /* asid */ NULL, /* au_tid_t */ NULL);
result = kextdProcessUserLoadRequest(request, remote_euid, remote_pid);
finish:
SAFE_RELEASE(requestData);
SAFE_RELEASE(request);
SAFE_RELEASE(error);
OSKextFlushInfoDictionary(NULL /* all kexts */);
OSKextFlushLoadInfo(NULL /* all kexts */, /* flushDependencies */ true);
/* MIG is consume-on-success
* xxx - do we need separate result & op-result?
*/
if (result == kOSReturnSuccess) {
vm_deallocate(mach_task_self(), (vm_address_t)xml_data_in,
(vm_size_t)xml_data_length);
}
return result;
}
/*******************************************************************************
*******************************************************************************/
const char * nameForPID(pid_t pid)
{
char * result = NULL;
int path_length = 0;
char path[PROC_PIDPATHINFO_MAXSIZE];
path_length = proc_pidpath(pid, path,
sizeof(path));
if (path_length > 0) {
result = basename(path);
}
if (!result) {
result = "(unknown)";
}
return result;
}
/*******************************************************************************
*******************************************************************************/
#define UNKNOWN_KEXT "unknown kext"
#define SYSTEM_FOLDER "/System/"
#define _kSystemExtensionsDirSlash (kSystemExtensionsDir "/")
#define _kLibraryExtensionsDirSlash (kLibraryExtensionsDir "/")
#define _kSystemFilesystemsDirSlash ("/System/Library/Filesystems/")
/*******************************************************************************
*******************************************************************************/
static CFURLRef createAbsOrRealURLForURL(
CFURLRef anURL,
uid_t remote_euid,
pid_t remote_pid,
OSReturn * error)
{
CFURLRef result = NULL;
OSReturn localError = kOSReturnSuccess;
Boolean inLE = FALSE;
Boolean inSLE = FALSE;
Boolean inSLF = FALSE;
char urlPathCString[PATH_MAX];
char realpathCString[PATH_MAX];
if (!CFURLGetFileSystemRepresentation(anURL, /* resolveToBase? */ TRUE,
(UInt8 *)urlPathCString, sizeof(urlPathCString)))
{
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"Can't get path from URL for kext load request.");
localError = kOSKextReturnSerialization;
goto finish;
}
if (remote_euid == 0) {
result = CFURLCopyAbsoluteURL(anURL);
if (!result) {
OSKextLogMemError();
goto finish;
}
goto finish;
} else {
inSLE = (0 == strncmp(urlPathCString, _kSystemExtensionsDirSlash,
strlen(_kSystemExtensionsDirSlash)));
inLE = (0 == strncmp(urlPathCString, _kLibraryExtensionsDirSlash,
strlen(_kLibraryExtensionsDirSlash)));
inSLF = (0 == strncmp(urlPathCString, _kSystemFilesystemsDirSlash,
strlen(_kSystemFilesystemsDirSlash)));
/*****
* May want to open these checks to use OSKextGetSystemExtensionsFolderURLs().
* For now, keep it tight and just do /System/Library/Extensions & Filesystems.
*/
if (!inSLE && !inSLF && !inLE) {
localError = kOSKextReturnNotPrivileged;
if (!inSLE && !inSLF) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"Request from non-root process '%s' (euid %d) to load %s - "
"not in extensions dirs or filesystems folder.",
nameForPID(remote_pid), remote_euid, urlPathCString);
}
goto finish;
}
if (!realpath(urlPathCString, realpathCString)) {
localError = kOSReturnError; // xxx - should we have a filesystem error?
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"Unable to resolve raw path %s.", urlPathCString);
goto finish;
}
/*****
* Check the path once more now that we've resolved it with realpath().
*/
inSLE = (0 == strncmp(realpathCString, _kSystemExtensionsDirSlash,
strlen(_kSystemExtensionsDirSlash)));
inLE = (0 == strncmp(urlPathCString, _kLibraryExtensionsDirSlash,
strlen(_kLibraryExtensionsDirSlash)));
inSLF = (0 == strncmp(realpathCString, _kSystemFilesystemsDirSlash,
strlen(_kSystemFilesystemsDirSlash)));
if (!inSLE && !inSLF && !inLE) {
localError = kOSKextReturnNotPrivileged;
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"Request from non-root process '%s' (euid %d) to load %s - "
"(real path %s) - not in extensions dirs or filesystems folder.",
nameForPID(remote_pid), remote_euid, urlPathCString,
realpathCString);
goto finish;
}
}
result = CFURLCreateFromFileSystemRepresentation(kCFAllocatorDefault,
(UInt8 *)realpathCString, strlen(realpathCString), /* isDir */ TRUE);
if (!result) {
OSKextLogMemError();
goto finish;
}
finish:
if (error) {
*error = localError;
}
return result;
}
/*******************************************************************************
*******************************************************************************/
static OSReturn
checkNonrootLoadAllowed(
OSKextRef kext,
uid_t remote_euid,
pid_t remote_pid)
{
OSReturn result = kOSKextReturnNotPrivileged;
CFArrayRef loadList = NULL; // must release
CFStringRef kextPath = NULL; // must release
Boolean kextAllows = TRUE;
char kextPathCString[PATH_MAX];
CFIndex count, index;
loadList = OSKextCopyLoadList(kext, /* needAll?*/ TRUE);
if (!loadList) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag |
kOSKextLogDependenciesFlag | kOSKextLogIPCFlag,
"Can't resolve dependencies for kext load request.");
result = kOSKextReturnDependencies;
goto finish;
}
count = CFArrayGetCount(loadList);
for (index = count - 1; index >= 0; index--) {
OSKextRef thisKext = (OSKextRef)CFArrayGetValueAtIndex(loadList, index);
CFBooleanRef allowed = (CFBooleanRef)OSKextGetValueForInfoDictionaryKey(
thisKext, CFSTR(kOSBundleAllowUserLoadKey));
CFURLRef kextURL = OSKextGetURL(thisKext);
SAFE_RELEASE_NULL(kextPath);
kextPath = CFURLCopyFileSystemPath(kextURL, kCFURLPOSIXPathStyle);
if (!kextPath) {
OSKextLogMemError();
result = kOSKextReturnNoMemory;
}
if (!CFURLGetFileSystemRepresentation(kextURL, /* resolveToBase? */ TRUE,
(UInt8 *)kextPathCString, sizeof(kextPathCString))) {
strlcpy(kextPathCString, UNKNOWN_KEXT, sizeof(UNKNOWN_KEXT));
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"Can't get path from URL for kext load request.");
result = kOSKextReturnSerialization;
goto finish;
}
if (!allowed ||
(CFGetTypeID(allowed) != CFBooleanGetTypeID()) ||
!CFBooleanGetValue(allowed)) {
kextAllows = FALSE;
goto finish;
}
}
result = kOSReturnSuccess;
finish:
SAFE_RELEASE(loadList);
SAFE_RELEASE(kextPath);
if (!kextAllows) {
result = kOSKextReturnNotPrivileged;
OSKextLog(/* kext */ NULL,