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kextload_main.c
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kextload_main.c
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/*
* kextload_main.c
* kext_tools
*
* Created by Nik Gervae on 11/08/08.
* Copyright 2008 Apple Inc. All rights reserved.
*
*/
#include "kextload_main.h"
#include "kext_tools_util.h"
#include "security.h"
#include <libc.h>
#include <servers/bootstrap.h>
#include <sysexits.h>
#include <Security/SecKeychainPriv.h>
#include <IOKit/kext/KextManager.h>
#include <IOKit/kext/KextManagerPriv.h>
#include <IOKit/kext/kextmanager_types.h>
#include <IOKit/kext/OSKextPrivate.h>
#pragma mark Constants
/*******************************************************************************
* Constants
*******************************************************************************/
#pragma mark Global/Static Variables
/*******************************************************************************
* Global/Static Variables
*******************************************************************************/
const char * progname = "(unknown)";
static Boolean sKextdActive = FALSE;
#pragma mark Main Routine
/*******************************************************************************
* Global variables.
*******************************************************************************/
ExitStatus
main(int argc, char * const * argv)
{
ExitStatus result = EX_SOFTWARE;
KextloadArgs toolArgs;
/*****
* Find out what the program was invoked as.
*/
progname = rindex(argv[0], '/');
if (progname) {
progname++; // go past the '/'
} else {
progname = (char *)argv[0];
}
/* Set the OSKext log callback right away.
*/
OSKextSetLogOutputFunction(&tool_log);
/*****
* Process args & check for permission to load.
*/
result = readArgs(argc, argv, &toolArgs);
if (result != EX_OK) {
if (result == kKextloadExitHelp) {
result = EX_OK;
}
goto finish;
}
result = checkArgs(&toolArgs);
if (result != EX_OK) {
goto finish;
}
result = checkAccess();
if (result != EX_OK) {
goto finish;
}
/*****
* Assemble the list of URLs to scan, in this order (the OSKext lib inverts it
* for last-opened-wins semantics):
* 1. System repository directories (if not asking kextd to load).
* 2. Named kexts (always given after -repository & -dependency on command line).
* 3. Named repository directories (-repository/-r).
* 4. Named dependencies get priority (-dependency/-d).
*
* #2 is necessary since one might try to run kextload on two kexts,
* one of which depends on the other.
*/
if (!sKextdActive) {
CFArrayRef sysExtFolders = OSKextGetSystemExtensionsFolderURLs();
if (!sysExtFolders) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"Can't get system extensions folders.");
result = EX_OSERR;
goto finish;
}
CFArrayAppendArray(toolArgs.scanURLs,
sysExtFolders, RANGE_ALL(sysExtFolders));
}
CFArrayAppendArray(toolArgs.scanURLs, toolArgs.kextURLs,
RANGE_ALL(toolArgs.kextURLs));
CFArrayAppendArray(toolArgs.scanURLs, toolArgs.repositoryURLs,
RANGE_ALL(toolArgs.repositoryURLs));
CFArrayAppendArray(toolArgs.scanURLs, toolArgs.dependencyURLs,
RANGE_ALL(toolArgs.dependencyURLs));
if (sKextdActive) {
result = loadKextsViaKextd(&toolArgs);
} else {
result = loadKextsIntoKernel(&toolArgs);
}
finish:
/* We're actually not going to free anything else because we're exiting!
*/
exit(result);
SAFE_RELEASE(toolArgs.kextIDs);
SAFE_RELEASE(toolArgs.dependencyURLs);
SAFE_RELEASE(toolArgs.repositoryURLs);
SAFE_RELEASE(toolArgs.kextURLs);
SAFE_RELEASE(toolArgs.scanURLs);
SAFE_RELEASE(toolArgs.allKexts);
return result;
}
#pragma mark Major Subroutines
/*******************************************************************************
* Major Subroutines
*******************************************************************************/
ExitStatus
readArgs(
int argc,
char * const * argv,
KextloadArgs * toolArgs)
{
ExitStatus result = EX_USAGE;
ExitStatus scratchResult = EX_USAGE;
int optchar;
int longindex;
CFStringRef scratchString = NULL; // must release
CFURLRef scratchURL = NULL; // must release
uint32_t i;
/* Set up default arg values.
*/
bzero(toolArgs, sizeof(*toolArgs));
/*****
* Allocate collection objects needed for reading args.
*/
if (!createCFMutableArray(&toolArgs->kextIDs, &kCFTypeArrayCallBacks) ||
!createCFMutableArray(&toolArgs->dependencyURLs, &kCFTypeArrayCallBacks) ||
!createCFMutableArray(&toolArgs->repositoryURLs, &kCFTypeArrayCallBacks) ||
!createCFMutableArray(&toolArgs->kextURLs, &kCFTypeArrayCallBacks) ||
!createCFMutableArray(&toolArgs->scanURLs, &kCFTypeArrayCallBacks)) {
result = EX_OSERR;
OSKextLogMemError();
exit(result);
}
while ((optchar = getopt_long_only(argc, (char * const *)argv,
kOptChars, sOptInfo, &longindex)) != -1) {
SAFE_RELEASE_NULL(scratchString);
SAFE_RELEASE_NULL(scratchURL);
switch (optchar) {
case kOptHelp:
usage(kUsageLevelFull);
result = kKextloadExitHelp;
goto finish;
break;
case kOptBundleIdentifier:
scratchString = CFStringCreateWithCString(kCFAllocatorDefault,
optarg, kCFStringEncodingUTF8);
if (!scratchString) {
OSKextLogMemError();
result = EX_OSERR;
goto finish;
}
CFArrayAppendValue(toolArgs->kextIDs, scratchString);
break;
case kOptDependency:
case kOptRepository:
scratchURL = CFURLCreateFromFileSystemRepresentation(
kCFAllocatorDefault,
(const UInt8 *)optarg, strlen(optarg), true);
if (!scratchURL) {
OSKextLogStringError(/* kext */ NULL);
result = EX_OSERR;
goto finish;
}
CFArrayAppendValue((optchar == kOptDependency) ?
toolArgs->dependencyURLs : toolArgs->repositoryURLs,
scratchURL);
break;
case kOptQuiet:
beQuiet();
break;
case kOptVerbose:
scratchResult = setLogFilterForOpt(argc, argv, /* forceOnFlags */ 0);
if (scratchResult != EX_OK) {
result = scratchResult;
goto finish;
}
break;
case kOptNoCaches:
OSKextLog(/* kext */ NULL,
kOSKextLogWarningLevel | kOSKextLogGeneralFlag,
"Notice: -%s (-%c) ignored; use kextutil(8) to test kexts.",
kOptNameNoCaches, kOptNoCaches);
break;
case kOptNoLoadedCheck:
OSKextLog(/* kext */ NULL,
kOSKextLogWarningLevel | kOSKextLogGeneralFlag,
"Notice: -%s (-%c) ignored.",
kOptNameNoLoadedCheck, kOptNoLoadedCheck);
break;
case kOptTests:
OSKextLog(/* kext */ NULL,
kOSKextLogWarningLevel | kOSKextLogGeneralFlag,
"Notice: -%s (-%c) ignored; use kextutil(8) to test kexts.",
kOptNameTests, kOptTests);
break;
case 0:
switch (longopt) {
default:
OSKextLog(/* kext */ NULL,
kOSKextLogWarningLevel | kOSKextLogGeneralFlag,
"Use kextutil(8) for development loading of kexts.");
goto finish;
break;
}
break;
default:
OSKextLog(/* kext */ NULL,
kOSKextLogWarningLevel | kOSKextLogGeneralFlag,
"Use kextutil(8) for development loading of kexts.");
goto finish;
break;
} /* switch (optchar) */
} /* while (optchar = getopt_long_only(...) */
/*****
* Record the kext names from the command line.
*/
for (i = optind; (int)i < argc; i++) {
SAFE_RELEASE_NULL(scratchURL);
scratchURL = CFURLCreateFromFileSystemRepresentation(
kCFAllocatorDefault,
(const UInt8 *)argv[i], strlen(argv[i]), true);
if (!scratchURL) {
result = EX_OSERR;
OSKextLogMemError();
goto finish;
}
CFArrayAppendValue(toolArgs->kextURLs, scratchURL);
}
result = EX_OK;
finish:
SAFE_RELEASE(scratchString);
SAFE_RELEASE(scratchURL);
if (result == EX_USAGE) {
usage(kUsageLevelBrief);
}
return result;
}
/*******************************************************************************
*******************************************************************************/
ExitStatus
checkArgs(KextloadArgs * toolArgs)
{
ExitStatus result = EX_USAGE;
if (!CFArrayGetCount(toolArgs->kextURLs) &&
!CFArrayGetCount(toolArgs->kextIDs)) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"No kernel extensions specified; name kernel extension bundles\n"
" following options, or use -%s (-%c).",
kOptNameBundleIdentifier, kOptBundleIdentifier);
goto finish;
}
result = EX_OK;
finish:
if (result == EX_USAGE) {
usage(kUsageLevelBrief);
}
return result;
}
/*******************************************************************************
*******************************************************************************/
ExitStatus checkAccess(void)
{
ExitStatus result = EX_OK;
#if !TARGET_OS_EMBEDDED
kern_return_t kern_result = kOSReturnError;
mach_port_t kextd_port = MACH_PORT_NULL;
kern_result = bootstrap_look_up(bootstrap_port,
(char *)KEXTD_SERVER_NAME, &kextd_port);
if (kern_result == kOSReturnSuccess) {
sKextdActive = TRUE;
} else {
if (geteuid() == 0) {
OSKextLog(/* kext */ NULL,
kOSKextLogBasicLevel | kOSKextLogGeneralFlag |
kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"Can't contact kextd; attempting to load directly into kernel.");
} else {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag |
kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"Can't contact kextd; must run as root to load kexts.");
result = EX_NOPERM;
goto finish;
}
}
#else
if (geteuid() != 0) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag |
kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"You must be running as root to load kexts.");
result = EX_NOPERM;
goto finish;
}
#endif /* !TARGET_OS_EMBEDDED */
finish:
#if !TARGET_OS_EMBEDDED
if (kextd_port != MACH_PORT_NULL) {
mach_port_deallocate(mach_task_self(), kextd_port);
}
#endif /* !TARGET_OS_EMBEDDED */
return result;
}
/*******************************************************************************
*******************************************************************************/
ExitStatus loadKextsViaKextd(KextloadArgs * toolArgs)
{
ExitStatus result = EX_OK;
OSReturn loadResult = kOSReturnError;
char scratchCString[PATH_MAX];
CFIndex count, index;
count = CFArrayGetCount(toolArgs->kextIDs);
for (index = 0; index < count; index++) {
CFStringRef kextID = CFArrayGetValueAtIndex(toolArgs->kextIDs, index);
if (!CFStringGetCString(kextID, scratchCString, sizeof(scratchCString),
kCFStringEncodingUTF8)) {
strlcpy(scratchCString, "unknown", sizeof(scratchCString));
}
OSKextLog(/* kext */ NULL,
kOSKextLogBasicLevel | kOSKextLogGeneralFlag |
kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"Requesting load of %s.",
scratchCString);
loadResult = KextManagerLoadKextWithIdentifier(kextID,
toolArgs->scanURLs);
if (loadResult != kOSReturnSuccess) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"%s failed to load - %s; "
"check the system/kernel logs for errors or try kextutil(8).",
scratchCString, safe_mach_error_string(loadResult));
if (result == EX_OK) {
result = exitStatusForOSReturn(loadResult);
// keep trying other kexts though
}
} else {
OSKextLog(/* kext */ NULL,
kOSKextLogBasicLevel | kOSKextLogGeneralFlag | kOSKextLogLoadFlag,
"%s loaded successfully (or already loaded).",
scratchCString);
}
}
count = CFArrayGetCount(toolArgs->kextURLs);
for (index = 0; index < count; index++) {
CFURLRef kextURL = CFArrayGetValueAtIndex(toolArgs->kextURLs, index);
if (!CFURLGetFileSystemRepresentation(kextURL, /* resolveToBase */ true,
(UInt8 *)scratchCString, sizeof(scratchCString))) {
strlcpy(scratchCString, "unknown", sizeof(scratchCString));
}
OSKextLog(/* kext */ NULL,
kOSKextLogBasicLevel | kOSKextLogGeneralFlag |
kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"Requesting load of %s.",
scratchCString);
loadResult = KextManagerLoadKextWithURL(kextURL,
toolArgs->scanURLs);
if (loadResult != kOSReturnSuccess) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"%s failed to load - %s; "
"check the system/kernel logs for errors or try kextutil(8).",
scratchCString, safe_mach_error_string(loadResult));
if (result == EX_OK) {
result = exitStatusForOSReturn(loadResult);
// keep trying other kexts though
}
} else {
OSKextLog(/* kext */ NULL,
kOSKextLogBasicLevel | kOSKextLogGeneralFlag | kOSKextLogLoadFlag,
"%s loaded successfully (or already loaded).",
scratchCString);
}
}
return result;
}
/*******************************************************************************
*******************************************************************************/
ExitStatus loadKextsIntoKernel(KextloadArgs * toolArgs)
{
ExitStatus result = EX_OK;
OSReturn loadResult = kOSReturnError;
char scratchCString[PATH_MAX];
CFIndex count, index;
#if !TARGET_OS_EMBEDDED
Boolean earlyBoot = false;
Boolean readOnly = false;
#endif
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel | kOSKextLogGeneralFlag,
"Reading extensions.");
toolArgs->allKexts = OSKextCreateKextsFromURLs(kCFAllocatorDefault,
toolArgs->scanURLs);
if (!toolArgs->allKexts) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"Can't read kexts from disk.");
result = EX_OSERR;
goto finish;
}
#if !TARGET_OS_EMBEDDED
// not perfect, but we check to see if kextd is running to determine
// if we are in early boot.
int skc_result;
earlyBoot = (isKextdRunning() == false);
skc_result = callSecKeychainMDSInstall();
if (skc_result != 0) {
// SecKeychainMDSInstall should never fail, except on read only FS.
// We get -67674 when SecKeychainMDSInstall can't write to its DB.
// see 18367703
if (earlyBoot && skc_result == -67674) {
struct statfs statfsBuffer;
if (statfs("/System/Library", &statfsBuffer) == 0) {
if (statfsBuffer.f_flags & MNT_RDONLY) {
readOnly = true;
}
}
}
else {
goto finish;
}
}
#endif
count = CFArrayGetCount(toolArgs->kextIDs);
for (index = 0; index < count; index++) {
OSKextRef theKext = NULL; // do not release
CFStringRef kextID = CFArrayGetValueAtIndex(
toolArgs->kextIDs,
index);
if (!CFStringGetCString(kextID, scratchCString, sizeof(scratchCString),
kCFStringEncodingUTF8)) {
strlcpy(scratchCString, "unknown", sizeof(scratchCString));
}
OSKextLog(/* kext */ NULL,
kOSKextLogBasicLevel | kOSKextLogGeneralFlag |
kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"Loading %s.",
scratchCString);
theKext = OSKextGetKextWithIdentifier(kextID);
if (!theKext) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"Error: Kext %s - not found/unable to create.", scratchCString);
result = kOSKextReturnNotFound;
goto finish;
}
#if !TARGET_OS_EMBEDDED
// temp change for 18367703
if (readOnly &&
(CFStringCompare(kextID, CFSTR("com.apple.nke.asp-tcp"), 0) == kCFCompareEqualTo
||
CFStringCompare(kextID, CFSTR("com.apple.filesystems.afpfs"), 0) == kCFCompareEqualTo)) {
OSKextLogCFString(NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag,
CFSTR("Netboot, loading '%@'"),
kextID);
}
else {
OSStatus sigResult = checkKextSignature(theKext, true, earlyBoot);
if ( sigResult != 0 ) {
if ( isInvalidSignatureAllowed() ) {
OSKextLogCFString(NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag,
CFSTR("kext-dev-mode allowing invalid signature %ld 0x%02lX for kext '%s'"),
(long)sigResult, (long)sigResult,
scratchCString);
}
else {
OSKextLogCFString(NULL,
kOSKextLogErrorLevel |
kOSKextLogLoadFlag | kOSKextLogIPCFlag,
CFSTR("ERROR: invalid signature for '%s', will not load"),
scratchCString);
result = sigResult;
goto finish;
}
}
}
#endif // not TARGET_OS_EMBEDDED
/* The codepath from this function will do any error logging
* and cleanup needed.
*/
loadResult = OSKextLoadWithOptions(theKext,
/* statExclusion */ kOSKextExcludeNone,
/* addPersonalitiesExclusion */ kOSKextExcludeNone,
/* personalityNames */ NULL,
/* delayAutounloadFlag */ false);
if (loadResult != kOSReturnSuccess) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"%s failed to load - %s.",
scratchCString, safe_mach_error_string(loadResult));
if (result == EX_OK) {
result = exitStatusForOSReturn(loadResult);
// keep trying other kexts though
}
} else {
OSKextLog(/* kext */ NULL,
kOSKextLogBasicLevel | kOSKextLogGeneralFlag | kOSKextLogLoadFlag,
"%s loaded successfully (or already loaded).",
scratchCString);
}
}
count = CFArrayGetCount(toolArgs->kextURLs);
for (index = 0; index < count; index++) {
CFURLRef kextURL = CFArrayGetValueAtIndex(
toolArgs->kextURLs,
index);
if (!CFURLGetFileSystemRepresentation(kextURL, /* resolveToBase */ true,
(UInt8 *)scratchCString, sizeof(scratchCString))) {
strlcpy(scratchCString, "unknown", sizeof(scratchCString));
}
OSKextLog(/* kext */ NULL,
kOSKextLogBasicLevel | kOSKextLogGeneralFlag |
kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"Loading %s.",
scratchCString);
OSKextRef theKext = NULL; // do not release
/* Use OSKextGetKextWithURL() to avoid double open error messages,
* because we already tried to open all kexts above.
* That means we don't log here if we don't find the kext.
*/
loadResult = kOSKextReturnNotFound;
theKext = OSKextGetKextWithURL(kextURL);
if (theKext) {
/* The codepath from OSKextLoadWithOptions will do any error logging
* and cleanup needed.
*/
#if !TARGET_OS_EMBEDDED
OSStatus sigResult = 0;
CFStringRef myBundleID = NULL; // do not release
myBundleID = OSKextGetIdentifier(theKext);
// temp change for 18367703
if (readOnly && myBundleID &&
(CFStringCompare(myBundleID, CFSTR("com.apple.nke.asp-tcp"), 0) == kCFCompareEqualTo
||
CFStringCompare(myBundleID, CFSTR("com.apple.filesystems.afpfs"), 0) == kCFCompareEqualTo)) {
OSKextLogCFString(NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag,
CFSTR("Netboot, loading '%@'"),
myBundleID);
}
else {
sigResult = checkKextSignature(theKext, true, earlyBoot);
if ( sigResult != 0 ) {
if ( isInvalidSignatureAllowed() ) {
OSKextLogCFString(NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag,
CFSTR("kext-dev-mode allowing invalid signature %ld 0x%02lX for kext '%s'"),
(long)sigResult, (long)sigResult,
scratchCString);
sigResult = 0;
}
else {
OSKextLogCFString(NULL,
kOSKextLogErrorLevel |
kOSKextLogLoadFlag | kOSKextLogIPCFlag,
CFSTR("ERROR: invalid signature for '%s', will not load"),
scratchCString);
loadResult = sigResult;
}
}
}
if (sigResult == 0) {
loadResult = OSKextLoadWithOptions(theKext,
kOSKextExcludeNone,
kOSKextExcludeNone,
NULL,
false);
}
#else
loadResult = OSKextLoadWithOptions(theKext,
kOSKextExcludeNone,
kOSKextExcludeNone,
NULL,
false);
#endif // not TARGET_OS_EMBEDDED
}
if (loadResult != kOSReturnSuccess) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag | kOSKextLogIPCFlag,
"%s failed to load - %s.",
scratchCString, safe_mach_error_string(loadResult));
if (result == EX_OK) {
result = exitStatusForOSReturn(loadResult);
// keep trying other kexts though
}
} else {
OSKextLog(/* kext */ NULL,
kOSKextLogBasicLevel | kOSKextLogGeneralFlag | kOSKextLogLoadFlag,
"%s loaded successfully (or already loaded).",
scratchCString);
}
}
finish:
return result;
}
/*******************************************************************************
*******************************************************************************/
ExitStatus exitStatusForOSReturn(OSReturn osReturn)
{
ExitStatus result = EX_OSERR;
switch (osReturn) {
case kOSKextReturnNotPrivileged:
result = EX_NOPERM;
break;
default:
result = EX_OSERR;
break;
}
return result;
}
/*******************************************************************************
* usage()
*******************************************************************************/
void usage(UsageLevel usageLevel)
{
fprintf(stderr, "usage: %s [options] [--] [kext] ...\n"
"\n", progname);
if (usageLevel == kUsageLevelBrief) {
fprintf(stderr, "use %s -%s for an explanation of each option\n",
progname, kOptNameHelp);
return;
}
fprintf(stderr, "kext: a kext bundle to load or examine\n");
fprintf(stderr, "\n");
fprintf(stderr, "-%s <bundle_id> (-%c):\n"
" load/use the kext whose CFBundleIdentifier is <bundle_id>\n",
kOptNameBundleIdentifier, kOptBundleIdentifier);
fprintf(stderr, "-%s <kext> (-%c):\n"
" consider <kext> as a candidate dependency\n",
kOptNameDependency, kOptDependency);
fprintf(stderr, "-%s <directory> (-%c):\n"
" look in <directory> for kexts\n",
kOptNameRepository, kOptRepository);
fprintf(stderr, "\n");
fprintf(stderr, "-%s (-%c):\n"
" quiet mode: print no informational or error messages\n",
kOptNameQuiet, kOptQuiet);
fprintf(stderr, "-%s [ 0-6 | 0x<flags> ] (-%c):\n"
" verbose mode; print info about analysis & loading\n",
kOptNameVerbose, kOptVerbose);
fprintf(stderr, "\n");
fprintf(stderr, "-%s (-%c): print this message and exit\n",
kOptNameHelp, kOptHelp);
fprintf(stderr, "\n");
fprintf(stderr, "--: end of options\n");
return;
}