mirror of https://github.com/opa334/TrollStore.git
Merge pull request #63 from luken11/signing-fast-path
Add fast path for apps that are already signed with a custom root
This commit is contained in:
Lars Fröder
GitHub
commit
a0dc58a4c0
345
Helper/main.m
345
Helper/main.m
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@ -8,53 +8,10 @@
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#import <objc/runtime.h>
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#import "CoreServices.h"
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#import "Shared.h"
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#import <mach-o/getsect.h>
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#import <mach-o/dyld.h>
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#import <mach/mach.h>
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#import <mach-o/loader.h>
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#import <mach-o/nlist.h>
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#import <mach-o/reloc.h>
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#import <mach-o/dyld_images.h>
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#import <mach-o/fat.h>
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#import <sys/utsname.h>
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#import <SpringBoardServices/SpringBoardServices.h>
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#ifdef __LP64__
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#define segment_command_universal segment_command_64
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#define mach_header_universal mach_header_64
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#define MH_MAGIC_UNIVERSAL MH_MAGIC_64
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#define MH_CIGAM_UNIVERSAL MH_CIGAM_64
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#else
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#define segment_command_universal segment_command
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#define mach_header_universal mach_header
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#define MH_MAGIC_UNIVERSAL MH_MAGIC
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#define MH_CIGAM_UNIVERSAL MH_CIGAM
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#endif
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#define SWAP32(x) ((((x) & 0xff000000) >> 24) | (((x) & 0xff0000) >> 8) | (((x) & 0xff00) << 8) | (((x) & 0xff) << 24))
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uint32_t s32(uint32_t toSwap, BOOL shouldSwap)
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{
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return shouldSwap ? SWAP32(toSwap) : toSwap;
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}
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#define CPU_SUBTYPE_ARM64E_NEW_ABI 0x80000002
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struct CSSuperBlob {
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uint32_t magic;
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uint32_t length;
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uint32_t count;
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};
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struct CSBlob {
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uint32_t type;
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uint32_t offset;
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};
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#define CS_MAGIC_EMBEDDED_SIGNATURE 0xfade0cc0
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#define CS_MAGIC_EMBEDDED_SIGNATURE_REVERSED 0xc00cdefa
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#define CS_MAGIC_EMBEDDED_ENTITLEMENTS 0xfade7171
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#import <Security/Security.h>
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extern mach_msg_return_t SBReloadIconForIdentifier(mach_port_t machport, const char* identifier);
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@interface SBSHomeScreenService : NSObject
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@ -65,6 +22,26 @@ extern NSString* BKSOpenApplicationOptionKeyActivateForEvent;
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extern void BKSTerminateApplicationForReasonAndReportWithDescription(NSString *bundleID, int reasonID, bool report, NSString *description);
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typedef CF_OPTIONS(uint32_t, SecCSFlags) {
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kSecCSDefaultFlags = 0
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};
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#define kSecCSRequirementInformation 1 << 2
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#define kSecCSSigningInformation 1 << 1
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typedef struct __SecCode const *SecStaticCodeRef;
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extern CFStringRef kSecCodeInfoEntitlementsDict;
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extern CFStringRef kSecCodeInfoCertificates;
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extern CFStringRef kSecPolicyAppleiPhoneApplicationSigning;
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extern CFStringRef kSecPolicyLeafMarkerOid;
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OSStatus SecStaticCodeCreateWithPathAndAttributes(CFURLRef path, SecCSFlags flags, CFDictionaryRef attributes, SecStaticCodeRef *staticCode);
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OSStatus SecCodeCopySigningInformation(SecStaticCodeRef code, SecCSFlags flags, CFDictionaryRef *information);
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CFDataRef SecCertificateCopyExtensionValue(SecCertificateRef certificate, CFTypeRef extensionOID, bool *isCritical);
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#define kCFPreferencesNoContainer CFSTR("kCFPreferencesNoContainer")
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typedef CFPropertyListRef (*_CFPreferencesCopyValueWithContainerType)(CFStringRef key, CFStringRef applicationID, CFStringRef userName, CFStringRef hostName, CFStringRef containerPath);
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@ -221,118 +198,189 @@ int runLdid(NSArray* args, NSString** output, NSString** errorOutput)
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return WEXITSTATUS(status);
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}
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NSDictionary* dumpEntitlements(NSString* binaryPath)
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SecStaticCodeRef getStaticCodeRef(NSString *binaryPath)
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{
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char* entitlementsData = NULL;
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uint32_t entitlementsLength = 0;
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FILE* machoFile = fopen(binaryPath.UTF8String, "rb");
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struct mach_header_universal header;
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fread(&header,sizeof(header),1,machoFile);
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uint32_t archOffset = 0;
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// Get arch offset if FAT binary
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if(header.magic == FAT_MAGIC || header.magic == FAT_CIGAM)
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if(binaryPath == nil)
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{
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fseek(machoFile,0,SEEK_SET);
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struct fat_header fatHeader;
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fread(&fatHeader,sizeof(fatHeader),1,machoFile);
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BOOL swpFat = fatHeader.magic == FAT_CIGAM;
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for(int i = 0; i < s32(fatHeader.nfat_arch, swpFat); i++)
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{
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struct fat_arch fatArch;
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fseek(machoFile,sizeof(fatHeader) + sizeof(fatArch) * i,SEEK_SET);
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fread(&fatArch,sizeof(fatArch),1,machoFile);
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if(s32(fatArch.cputype, swpFat) != CPU_TYPE_ARM64)
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{
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continue;
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return NULL;
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}
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archOffset = s32(fatArch.offset, swpFat);
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break;
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}
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CFURLRef binaryURL = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, (__bridge CFStringRef)binaryPath, kCFURLPOSIXPathStyle, false);
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if(binaryURL == NULL)
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{
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NSLog(@"[getStaticCodeRef] failed to get URL to binary %@", binaryPath);
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return NULL;
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}
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fseek(machoFile,archOffset,SEEK_SET);
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fread(&header,sizeof(header),1,machoFile);
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SecStaticCodeRef codeRef = NULL;
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OSStatus result;
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if(header.magic == MH_MAGIC_UNIVERSAL || header.magic == MH_CIGAM_UNIVERSAL)
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result = SecStaticCodeCreateWithPathAndAttributes(binaryURL, kSecCSDefaultFlags, NULL, &codeRef);
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CFRelease(binaryURL);
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if(result != errSecSuccess)
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{
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BOOL swp = header.magic == MH_CIGAM_UNIVERSAL;
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// This code is cursed, don't stare at it too long or it will stare back at you
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uint32_t offset = archOffset + sizeof(header);
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for(int c = 0; c < s32(header.ncmds, swp); c++)
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{
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fseek(machoFile,offset,SEEK_SET);
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struct load_command cmd;
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fread(&cmd,sizeof(cmd),1,machoFile);
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uint32_t normalizedCmd = s32(cmd.cmd,swp);
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if(normalizedCmd == LC_CODE_SIGNATURE)
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{
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struct linkedit_data_command codeSignCommand;
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fseek(machoFile,offset,SEEK_SET);
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fread(&codeSignCommand,sizeof(codeSignCommand),1,machoFile);
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uint32_t codeSignCmdOffset = archOffset + s32(codeSignCommand.dataoff, swp);
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fseek(machoFile, codeSignCmdOffset, SEEK_SET);
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struct CSSuperBlob superBlob;
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fread(&superBlob, sizeof(superBlob), 1, machoFile);
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if(SWAP32(superBlob.magic) == CS_MAGIC_EMBEDDED_SIGNATURE) // YES starting here everything is swapped no matter if CIGAM or MAGIC...
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{
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uint32_t itemCount = SWAP32(superBlob.count);
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for(int i = 0; i < itemCount; i++)
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{
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fseek(machoFile, codeSignCmdOffset + sizeof(superBlob) + i * sizeof(struct CSBlob),SEEK_SET);
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struct CSBlob blob;
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fread(&blob, sizeof(struct CSBlob), 1, machoFile);
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fseek(machoFile, codeSignCmdOffset + SWAP32(blob.offset),SEEK_SET);
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uint32_t blobMagic;
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fread(&blobMagic, sizeof(uint32_t), 1, machoFile);
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if(SWAP32(blobMagic) == CS_MAGIC_EMBEDDED_ENTITLEMENTS)
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{
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uint32_t entitlementsLengthTmp;
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fread(&entitlementsLengthTmp, sizeof(uint32_t), 1, machoFile);
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entitlementsLength = SWAP32(entitlementsLengthTmp);
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entitlementsData = malloc(entitlementsLength - 8);
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fread(&entitlementsData[0], entitlementsLength - 8, 1, machoFile);
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break;
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}
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}
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NSLog(@"[getStaticCodeRef] failed to create static code for binary %@", binaryPath);
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return NULL;
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}
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break;
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}
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return codeRef;
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}
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offset += cmd.cmdsize;
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}
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}
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NSDictionary* dumpEntitlements(SecStaticCodeRef codeRef)
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{
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fclose(machoFile);
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NSData* entitlementsNSData = nil;
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if(entitlementsData)
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if(codeRef == NULL)
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{
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entitlementsNSData = [NSData dataWithBytes:entitlementsData length:entitlementsLength];
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free(entitlementsData);
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NSLog(@"[dumpEntitlements] attempting to dump entitlements without a StaticCodeRef");
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return nil;
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}
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if(entitlementsNSData)
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CFDictionaryRef signingInfo = NULL;
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OSStatus result;
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result = SecCodeCopySigningInformation(codeRef, kSecCSRequirementInformation, &signingInfo);
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if(result != errSecSuccess)
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{
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NSDictionary* plist = [NSPropertyListSerialization propertyListWithData:entitlementsNSData options:NSPropertyListImmutable format:nil error:nil];
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NSLog(@"%@ dumped entitlements %@", binaryPath, plist);
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return plist;
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NSLog(@"[dumpEntitlements] failed to copy signing info from static code");
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return nil;
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}
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NSDictionary *entitlementsNSDict = nil;
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CFDictionaryRef entitlements = CFDictionaryGetValue(signingInfo, kSecCodeInfoEntitlementsDict);
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if(entitlements == NULL)
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{
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NSLog(@"[dumpEntitlements] no entitlements specified");
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}
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else if(CFGetTypeID(entitlements) != CFDictionaryGetTypeID())
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{
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NSLog(@"[dumpEntitlements] invalid entitlements");
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}
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else
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{
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NSLog(@"Failed to dump entitlements of %@... This is bad", binaryPath);
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entitlementsNSDict = (__bridge NSDictionary *)(entitlements);
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NSLog(@"[dumpEntitlements] dumped %@", entitlementsNSDict);
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}
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CFRelease(signingInfo);
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return entitlementsNSDict;
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}
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NSDictionary* dumpEntitlementsFromBinaryAtPath(NSString *binaryPath)
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{
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// This function is intended for one-shot checks. Main-event functions should retain/release their own SecStaticCodeRefs
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if(binaryPath == nil)
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{
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return nil;
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}
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SecStaticCodeRef codeRef = getStaticCodeRef(binaryPath);
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if(codeRef == NULL)
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{
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return nil;
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}
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NSDictionary *entitlements = dumpEntitlements(codeRef);
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CFRelease(codeRef);
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return entitlements;
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}
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BOOL certificateHasDataForExtensionOID(SecCertificateRef certificate, CFStringRef oidString)
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{
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if(certificate == NULL || oidString == NULL)
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{
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NSLog(@"[certificateHasDataForExtensionOID] attempted to check null certificate or OID");
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return NO;
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}
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CFDataRef extensionData = SecCertificateCopyExtensionValue(certificate, oidString, NULL);
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if(extensionData != NULL)
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{
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CFRelease(extensionData);
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return YES;
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}
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return NO;
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}
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BOOL codeCertChainContainsFakeAppStoreExtensions(SecStaticCodeRef codeRef)
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{
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if(codeRef == NULL)
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{
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NSLog(@"[codeCertChainContainsFakeAppStoreExtensions] attempted to check cert chain of null static code object");
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return NO;
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}
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CFDictionaryRef signingInfo = NULL;
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OSStatus result;
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result = SecCodeCopySigningInformation(codeRef, kSecCSSigningInformation, &signingInfo);
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if(result != errSecSuccess)
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{
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NSLog(@"[codeCertChainContainsFakeAppStoreExtensions] failed to copy signing info from static code");
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return NO;
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}
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CFArrayRef certificates = CFDictionaryGetValue(signingInfo, kSecCodeInfoCertificates);
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// If we match the standard Apple policy, we are signed properly, but we haven't been deliberately signed with a custom root
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SecPolicyRef genuineApplePolicy = SecPolicyCreateWithProperties(kSecPolicyAppleiPhoneApplicationSigning, NULL);
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SecTrustRef genuineAppleTrust = NULL;
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SecTrustCreateWithCertificates(certificates, genuineApplePolicy, &genuineAppleTrust);
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if(SecTrustEvaluateWithError(genuineAppleTrust, nil))
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{
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CFRelease(genuineAppleTrust);
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CFRelease(genuineApplePolicy);
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CFRelease(signingInfo);
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NSLog(@"[codeCertChainContainsFakeAppStoreExtensions] found certificate extension, but was issued by Apple");
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return NO;
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}
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// We haven't matched Apple, so keep going. Are we using a custom root that would take the App Store fastpath?
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CFRelease(genuineAppleTrust);
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CFRelease(genuineApplePolicy);
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// Cert chain should be of length 3
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if(CFArrayGetCount(certificates) != 3)
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{
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CFRelease(signingInfo);
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NSLog(@"[codeCertChainContainsFakeAppStoreExtensions] certificate chain length != 3");
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return NO;
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}
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const void *keys[1] = { kSecPolicyLeafMarkerOid };
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const void *values[1] = { CFSTR("1.2.840.113635.100.6.1.3") };
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CFDictionaryRef customPolicyOptions = CFDictionaryCreate(NULL, keys, values, 1, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
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// AppleCodeSigning only checks for the codeSigning EKU by default
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SecPolicyRef customRootPolicy = SecPolicyCreateWithProperties(kSecPolicyAppleCodeSigning, customPolicyOptions);
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SecTrustRef customRootTrust = NULL;
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// Need to add our certificate chain to the anchor as it is expected to be a self-signed root
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SecTrustCreateWithCertificates(certificates, customRootPolicy, &customRootTrust);
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SecTrustSetAnchorCertificates(customRootTrust, certificates);
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BOOL evaluatesToCustomAnchor = SecTrustEvaluateWithError(customRootTrust, nil);
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CFRelease(customRootTrust);
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CFRelease(customRootPolicy);
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CFRelease(customPolicyOptions);
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CFRelease(signingInfo);
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return evaluatesToCustomAnchor;
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}
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BOOL signApp(NSString* appPath, NSError** error)
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@ -347,12 +395,41 @@ BOOL signApp(NSString* appPath, NSError** error)
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if(![[NSFileManager defaultManager] fileExistsAtPath:executablePath]) return NO;
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NSObject *tsBundleIsPreSigned = appInfoDict[@"TSBundlePreSigned"];
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if([tsBundleIsPreSigned isKindOfClass:[NSNumber class]])
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{
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// if TSBundlePreSigned = YES, this bundle has been externally signed so we can skip over signing it now
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NSNumber *tsBundleIsPreSignedNum = (NSNumber *)tsBundleIsPreSigned;
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if([tsBundleIsPreSignedNum boolValue] == YES)
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{
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NSLog(@"[signApp] taking fast path for app which declares it has already been signed (%@)", executablePath);
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return YES;
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}
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}
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SecStaticCodeRef codeRef = getStaticCodeRef(executablePath);
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if(codeRef == NULL)
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{
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NSLog(@"[signApp] failed to get static code, can't derive entitlements from %@", executablePath);
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return NO;
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}
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if(codeCertChainContainsFakeAppStoreExtensions(codeRef))
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{
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NSLog(@"[signApp] taking fast path for app signed using a custom root certificate (%@)", executablePath);
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CFRelease(codeRef);
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return YES;
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}
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NSString* certPath = [trollStoreAppPath() stringByAppendingPathComponent:@"cert.p12"];
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NSString* certArg = [@"-K" stringByAppendingPathComponent:certPath];
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NSString* errorOutput;
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int ldidRet;
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NSDictionary* entitlements = dumpEntitlements(executablePath);
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NSDictionary* entitlements = dumpEntitlements(codeRef);
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CFRelease(codeRef);
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if(!entitlements)
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{
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NSLog(@"app main binary has no entitlements, signing app with fallback entitlements...");
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@ -6,7 +6,7 @@
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// uicache on steroids
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extern NSDictionary* dumpEntitlements(NSString* binaryPath);
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extern NSDictionary* dumpEntitlementsFromBinaryAtPath(NSString* binaryPath);
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NSDictionary* constructGroupsContainersForEntitlements(NSDictionary* entitlements, BOOL systemGroups)
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{
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@ -118,7 +118,7 @@ void registerPath(char* cPath, int unregister)
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// Add entitlements
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NSString* appExecutablePath = [path stringByAppendingPathComponent:appInfoPlist[@"CFBundleExecutable"]];
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NSDictionary* entitlements = dumpEntitlements(appExecutablePath);
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NSDictionary* entitlements = dumpEntitlementsFromBinaryAtPath(appExecutablePath);
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if(entitlements)
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{
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dictToRegister[@"Entitlements"] = entitlements;
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@ -188,7 +188,7 @@ void registerPath(char* cPath, int unregister)
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// Add entitlements
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NSString* pluginExecutablePath = [pluginPath stringByAppendingPathComponent:pluginInfoPlist[@"CFBundleExecutable"]];
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NSDictionary* pluginEntitlements = dumpEntitlements(pluginExecutablePath);
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NSDictionary* pluginEntitlements = dumpEntitlementsFromBinaryAtPath(pluginExecutablePath);
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if(pluginEntitlements)
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{
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pluginDict[@"Entitlements"] = pluginEntitlements;
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