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SecStaticCode.cpp
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SecStaticCode.cpp
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/*
* Copyright (c) 2006-2007,2011-2015 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@
*/
//
// SecStaticCode - API frame for SecStaticCode objects
//
#include "cs.h"
#include "StaticCode.h"
#include <security_utilities/cfmunge.h>
#include <security_utilities/logging.h>
#include <fcntl.h>
#include <dirent.h>
using namespace CodeSigning;
//
// CF-standard type code function
//
CFTypeID SecStaticCodeGetTypeID(void)
{
BEGIN_CSAPI
return gCFObjects().StaticCode.typeID;
END_CSAPI1(_kCFRuntimeNotATypeID)
}
//
// Create an StaticCode directly from disk path.
//
OSStatus SecStaticCodeCreateWithPath(CFURLRef path, SecCSFlags flags, SecStaticCodeRef *staticCodeRef)
{
BEGIN_CSAPI
checkFlags(flags, kSecCSForceOnlineNotarizationCheck);
CodeSigning::Required(staticCodeRef) = (new SecStaticCode(DiskRep::bestGuess(cfString(path).c_str()), flags))->handle();
END_CSAPI
}
const CFStringRef kSecCodeAttributeArchitecture = CFSTR("architecture");
const CFStringRef kSecCodeAttributeSubarchitecture =CFSTR("subarchitecture");
const CFStringRef kSecCodeAttributeBundleVersion = CFSTR("bundleversion");
const CFStringRef kSecCodeAttributeUniversalFileOffset = CFSTR("UniversalFileOffset");
OSStatus SecStaticCodeCreateWithPathAndAttributes(CFURLRef path, SecCSFlags flags, CFDictionaryRef attributes,
SecStaticCodeRef *staticCodeRef)
{
BEGIN_CSAPI
checkFlags(flags, kSecCSForceOnlineNotarizationCheck);
DiskRep::Context ctx;
std::string version; // holds memory placed into ctx
if (attributes) {
std::string archName;
int archNumber, subarchNumber, offset;
if (cfscan(attributes, "{%O=%d}", kSecCodeAttributeUniversalFileOffset, &offset)) {
ctx.offset = offset;
} else if (cfscan(attributes, "{%O=%s}", kSecCodeAttributeArchitecture, &archName)) {
ctx.arch = Architecture(archName.c_str());
} else if (cfscan(attributes, "{%O=%d,%O=%d}",
kSecCodeAttributeArchitecture, &archNumber, kSecCodeAttributeSubarchitecture, &subarchNumber))
ctx.arch = Architecture(archNumber, subarchNumber);
else if (cfscan(attributes, "{%O=%d}", kSecCodeAttributeArchitecture, &archNumber))
ctx.arch = Architecture(archNumber);
if (cfscan(attributes, "{%O=%s}", kSecCodeAttributeBundleVersion, &version))
ctx.version = version.c_str();
}
CodeSigning::Required(staticCodeRef) = (new SecStaticCode(DiskRep::bestGuess(cfString(path).c_str(), &ctx), flags))->handle();
END_CSAPI
}
//
// Check static validity of a StaticCode
//
OSStatus SecStaticCodeCheckValidity(SecStaticCodeRef staticCodeRef, SecCSFlags flags,
SecRequirementRef requirementRef)
{
return SecStaticCodeCheckValidityWithErrors(staticCodeRef, flags, requirementRef, NULL);
}
OSStatus SecStaticCodeCheckValidityWithErrors(SecStaticCodeRef staticCodeRef, SecCSFlags flags,
SecRequirementRef requirementRef, CFErrorRef *errors)
{
BEGIN_CSAPI
checkFlags(flags,
kSecCSReportProgress
| kSecCSCheckAllArchitectures
| kSecCSDoNotValidateExecutable
| kSecCSDoNotValidateResources
| kSecCSConsiderExpiration
| kSecCSEnforceRevocationChecks
| kSecCSNoNetworkAccess
| kSecCSCheckNestedCode
| kSecCSStrictValidate
| kSecCSStrictValidateStructure
| kSecCSRestrictSidebandData
| kSecCSCheckGatekeeperArchitectures
| kSecCSRestrictSymlinks
| kSecCSRestrictToAppLike
| kSecCSUseSoftwareSigningCert
| kSecCSValidatePEH
| kSecCSSingleThreaded
| kSecCSApplyEmbeddedPolicy
| kSecCSSkipRootVolumeExceptions
| kSecCSSkipXattrFiles
| kSecCSAllowNetworkAccess
);
if (errors)
flags |= kSecCSFullReport; // internal-use flag
#if !TARGET_OS_OSX
flags |= kSecCSApplyEmbeddedPolicy;
#endif
SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(staticCodeRef);
code->setValidationFlags(flags);
const SecRequirement *req = SecRequirement::optional(requirementRef);
DTRACK(CODESIGN_EVAL_STATIC, code, (char*)code->mainExecutablePath().c_str());
code->staticValidate(flags, req);
// Everything checked out correctly but we need to make sure that when
// we validated the code directory, we trusted the signer. We defer this
// until now because the caller may still trust the signer via a
// provisioning profile so if we prematurely throw an error when validating
// the directory, we potentially skip resource validation even though the
// caller will go on to trust the signature
// <rdar://problem/6075501> Applications that are validated against a provisioning profile do not have their resources checked
if ((flags & kSecCSApplyEmbeddedPolicy) && code->trustedSigningCertChain() == false) {
return CSError::cfError(errors, errSecCSSignatureUntrusted);
}
END_CSAPI_ERRORS
}
OSStatus SecStaticCodeValidateResourceWithErrors(SecStaticCodeRef staticCodeRef, CFURLRef resourcePath, SecCSFlags flags, CFErrorRef *errors)
{
BEGIN_CSAPI
checkFlags(flags,
kSecCSCheckAllArchitectures
| kSecCSConsiderExpiration
| kSecCSEnforceRevocationChecks
| kSecCSNoNetworkAccess
| kSecCSStrictValidate
| kSecCSStrictValidateStructure
| kSecCSRestrictSidebandData
| kSecCSCheckGatekeeperArchitectures
| kSecCSSkipRootVolumeExceptions
| kSecCSAllowNetworkAccess
| kSecCSFastExecutableValidation
);
SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(staticCodeRef);
code->setValidationFlags(flags);
code->staticValidateResource(cfString(resourcePath), flags, NULL);
END_CSAPI_ERRORS
}
//
// ====================================================================================
//
// The following API functions are called SecCode* but accept both SecCodeRef and
// SecStaticCodeRef arguments, operating on the implied SecStaticCodeRef as appropriate.
// Hence they're here, rather than in SecCode.cpp.
//
//
// Retrieve location information for an StaticCode.
//
OSStatus SecCodeCopyPath(SecStaticCodeRef staticCodeRef, SecCSFlags flags, CFURLRef *path)
{
BEGIN_CSAPI
checkFlags(flags);
SecPointer<SecStaticCode> staticCode = SecStaticCode::requiredStatic(staticCodeRef);
CodeSigning::Required(path) = staticCode->copyCanonicalPath();
END_CSAPI
}
//
// Fetch or make up a designated requirement
//
OSStatus SecCodeCopyDesignatedRequirement(SecStaticCodeRef staticCodeRef, SecCSFlags flags,
SecRequirementRef *requirementRef)
{
BEGIN_CSAPI
checkFlags(flags);
const Requirement *req =
SecStaticCode::requiredStatic(staticCodeRef)->designatedRequirement();
CodeSigning::Required(requirementRef) = (new SecRequirement(req))->handle();
END_CSAPI
}
//
// Fetch a particular internal requirement, if present
//
OSStatus SecCodeCopyInternalRequirement(SecStaticCodeRef staticCodeRef, SecRequirementType type,
SecCSFlags flags, SecRequirementRef *requirementRef)
{
BEGIN_CSAPI
checkFlags(flags);
const Requirement *req =
SecStaticCode::requiredStatic(staticCodeRef)->internalRequirement(type);
CodeSigning::Required(requirementRef) = req ? (new SecRequirement(req))->handle() : NULL;
END_CSAPI
}
//
// Record for future use a detached code signature.
//
OSStatus SecCodeSetDetachedSignature(SecStaticCodeRef codeRef, CFDataRef signature,
SecCSFlags flags)
{
BEGIN_CSAPI
checkFlags(flags);
SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(codeRef);
code->detachedSignature(signature); // ... and pass it to the code
code->resetValidity();
END_CSAPI
}
//
// Attach a code signature to a kernel memory mapping for page-in validation.
//
OSStatus SecCodeMapMemory(SecStaticCodeRef codeRef, SecCSFlags flags)
{
BEGIN_CSAPI
checkFlags(flags);
SecPointer<SecStaticCode> code = SecStaticCode::requiredStatic(codeRef);
if (const CodeDirectory *cd = code->codeDirectory(false)) {
if (code->isDetached()) {
// Detached signatures need to attach their code directory from memory.
fsignatures args = { static_cast<off_t>(code->diskRep()->signingBase()), (void *)cd, cd->length() };
UnixError::check(::fcntl(code->diskRep()->fd(), F_ADDSIGS, &args));
} else {
// All other signatures can simply point to the signature in the main executable.
Universal *execImage = code->diskRep()->mainExecutableImage();
if (execImage == NULL) {
MacOSError::throwMe(errSecCSNoMainExecutable);
}
unique_ptr<MachO> arch(execImage->architecture());
if (arch.get() == NULL) {
MacOSError::throwMe(errSecCSNoMainExecutable);
}
size_t signatureOffset = arch->signingOffset();
size_t signatureLength = arch->signingLength();
if (signatureOffset == 0) {
MacOSError::throwMe(errSecCSUnsigned);
}
fsignatures args = {
static_cast<off_t>(code->diskRep()->signingBase()),
(void *)signatureOffset,
signatureLength,
};
UnixError::check(::fcntl(code->diskRep()->fd(), F_ADDFILESIGS, &args));
}
} else {
MacOSError::throwMe(errSecCSUnsigned);
}
END_CSAPI
}
//
// Attach a callback block to a code object
//
OSStatus SecStaticCodeSetCallback(SecStaticCodeRef codeRef, SecCSFlags flags, SecCodeCallback *old, SecCodeCallback monitor)
{
BEGIN_CSAPI
checkFlags(flags);
SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
if (old)
*old = code->monitor();
code->setMonitor(monitor);
END_CSAPI
}
OSStatus SecStaticCodeSetValidationConditions(SecStaticCodeRef codeRef, CFDictionaryRef conditions)
{
BEGIN_CSAPI
checkFlags(0);
SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
code->setValidationModifiers(conditions);
END_CSAPI
}
//
// Set cancellation flag on a static code object.
//
OSStatus SecStaticCodeCancelValidation(SecStaticCodeRef codeRef, SecCSFlags flags)
{
BEGIN_CSAPI
checkFlags(0);
SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
code->cancelValidation();
END_CSAPI
}
//
// Retrieve a component object for a special slot directly.
//
CFDataRef SecCodeCopyComponent(SecCodeRef codeRef, int slot, CFDataRef hash)
{
BEGIN_CSAPI
SecStaticCode* code = SecStaticCode::requiredStatic(codeRef);
return code->copyComponent(slot, hash);
END_CSAPI1(NULL)
}
//
// Check if a special slot exists
//
CFBooleanRef SecCodeSpecialSlotIsPresent(SecStaticCodeRef codeRef, int slot)
{
BEGIN_CSAPI
SecStaticCode* code = SecStaticCode::requiredStatic(codeRef);
return code->codeDirectory()->slotIsPresent(-slot) ? kCFBooleanTrue : kCFBooleanFalse ;
END_CSAPI1(kCFBooleanFalse)
}
//
// Updates the flags to indicate whether this object wants to enable online notarization checks.
//
OSStatus SecStaticCodeEnableOnlineNotarizationCheck(SecStaticCodeRef codeRef, Boolean enable)
{
BEGIN_CSAPI
SecStaticCode* code = SecStaticCode::requiredStatic(codeRef);
SecCSFlags flags = code->getFlags();
if (enable) {
flags = addFlags(flags, kSecCSForceOnlineNotarizationCheck);
} else {
flags = clearFlags(flags, kSecCSForceOnlineNotarizationCheck);
}
code->setFlags(flags);
END_CSAPI
}
//
// Validate a single plain file's resource seal against a memory copy.
// This will fail for any other file type (symlink, directory, nested code, etc. etc.)
//
OSStatus SecCodeValidateFileResource(SecStaticCodeRef codeRef, CFStringRef relativePath, CFDataRef fileData, SecCSFlags flags)
{
BEGIN_CSAPI
checkFlags(0);
if (fileData == NULL)
MacOSError::throwMe(errSecCSObjectRequired);
SecStaticCode *code = SecStaticCode::requiredStatic(codeRef);
code->validatePlainMemoryResource(cfString(relativePath), fileData, flags);
END_CSAPI
}