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jelbrek.m
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#import "jelbrek.h"
#import "amfi_utils.h"
#import "kernelSymbolFinder.h"
uint32_t KASLR_Slide;
uint64_t KernelBase;
mach_port_t TFP0;
NSString *newPath;
int init_jelbrek(mach_port_t tfpzero) {
@autoreleasepool {
printf("[*] Initializing jelbrekLibE\n");
if (!MACH_PORT_VALID(tfpzero)) {
printf("[-] tfp0 port not valid\n");
return 1;
}
offsets_init(); // Ian Beer's offset struct
//------- init the required variables -------//
TFP0 = tfpzero;
//---- init utilities ----//
init_kernel_utils(TFP0); // memory stuff
KernelBase = FindKernelBase();
if (!KernelBase) {
printf("[-] failed to find kernel base\n");
return 2;
}
KASLR_Slide = (uint32_t)(KernelBase - 0xFFFFFFF007004000); // slid kernel base - kernel base = kaslr slide
int ret = InitPatchfinder(KernelBase, NULL); // patchfinder
if (ret) {
printf("[-] Failed to initialize patchfinder\n");
return 3;
}
printf("[+] Initialized patchfinder\n");
uint64_t sb = unsandbox(getpid());
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
// random enough
// let's say this is ran from an unsandboxed process
// home dir is /var/mobile/Documents
// there's a chance a file named kernelcache is there
// who knows what people do XD, at least I have done it
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"dd.MM.YY:HH.mm.ss"];
NSString *docs = [[[fileManager URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject] path];
mkdir((char *)[docs UTF8String], 0777);
newPath = [docs stringByAppendingPathComponent:[NSString stringWithFormat:@"%@_kernelcache", [formatter stringFromDate:[NSDate date]]]];
printf("[*] copying to %s\n", [newPath UTF8String]);
// create a copy to be safe
[fileManager copyItemAtPath:@"/System/Library/Caches/com.apple.kernelcaches/kernelcache" toPath:newPath error:&error];
if (error) {
printf("[-] Failed to copy kernelcache with error: %s\n", [[error localizedDescription] UTF8String]);
return 4;
}
sandbox(getpid(), sb);
// init
if (initWithKernelCache((char *)[newPath UTF8String])) {
printf("[-] Error initializing KernelSymbolFinder\n");
return 4;
}
printf("[+] Initialized KernelSymbolFinder\n");
unlink((char *)[newPath UTF8String]);
init_Kernel_Execute(); //kernel execution
return 0;
}
}
typedef int (*kexecFunc)(uint64_t function, size_t argument_count, ...);
int init_with_kbase(mach_port_t tfpzero, uint64_t kernelBase, kexecFunc kexec) {
@autoreleasepool {
printf("[*] Initializing jelbrekLibE\n");
if (!MACH_PORT_VALID(tfpzero)) {
printf("[-] tfp0 port not valid\n");
return 1;
}
offsets_init(); // Ian Beer's offset struct
//------- init the required variables -------//
TFP0 = tfpzero;
//---- init utilities ----//
init_kernel_utils(TFP0); // memory stuff
KernelBase = kernelBase;
if (!KernelBase) {
printf("[-] failed to find kernel base\n");
return 2;
}
KASLR_Slide = (uint32_t)(KernelBase - 0xFFFFFFF007004000); // slid kernel base - kernel base = kaslr slide
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
// random enough
// let's say this is ran from an unsandboxed process
// home dir is /var/mobile/Documents
// there's a chance a file named kernelcache is there
// who knows what people do XD, at least I have done it
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"dd.MM.YY:HH.mm.ss"];
NSString *docs = [[[fileManager URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject] path];
mkdir((char *)[docs UTF8String], 0777);
newPath = [docs stringByAppendingPathComponent:[NSString stringWithFormat:@"%@_kernelcache", [formatter stringFromDate:[NSDate date]]]];
printf("[+] copying Kernelcache to %s\n", [newPath UTF8String]);
// create a copy to be safe
[fileManager copyItemAtPath:@"/System/Library/Caches/com.apple.kernelcaches/kernelcache" toPath:newPath error:&error];
if (error) {
printf("[-] Failed to copy kernelcache with error: %s\n", [[error localizedDescription] UTF8String]);
return 4;
}
printf("[*] copied Kernelcache\n");
// initiate KernelSymbolFinder
int initKSF = initWithKernelCache((char *)[newPath UTF8String]);
if (initKSF != 0) {
printf("[-] Error initializing KernelSymbolFinder\n");
return 4;
}
printf("[+] Initialized KernelSymbolFinder\n");
unlink((char *)[newPath UTF8String]);
// initiate Patchfinder
int ret = InitPatchfinder(0, (char *)[[newPath stringByAppendingString:@".dec"] UTF8String]); // patchfinder
if (ret != 0) {
printf("[-] Failed to initialize patchfinder\n");
return 3;
}
printf("[*] Initialized patchfinder\n");
kernel_exec = kexec;
if (!kernel_exec) init_Kernel_Execute(); //kernel execution
return 0;
}
}
void term_jelbrek() {
printf("[*] Cleaning up...\n");
TermPatchfinder(); // free memory used by patchfinder
term_Kernel_Execute(); // free stuff used by kexecute
unlink((char *)[[newPath stringByAppendingString:@".dec"] UTF8String]);
printf("[*] Clean up finished\n");
}
// Adds macho binaries on the AMFI trustcache
// This basically bypasses all signature checks on that file
// kernel thinks it's "trusted"
/*
Usage: pass a single binary or a directory for recursive patching
Technique originally made by xerub
theninjaprawn slightly patched it up and created a patchfinder
*/
int trustbin(const char *path) {
NSMutableArray *paths = [NSMutableArray array];
NSFileManager *fileManager = [NSFileManager defaultManager];
BOOL isDir = NO;
if (![fileManager fileExistsAtPath:@(path) isDirectory:&isDir]) {
printf("[-] Path does not exist!\n");
return -1;
}
NSURL *directoryURL = [NSURL URLWithString:@(path)];
NSArray *keys = [NSArray arrayWithObject:NSURLIsDirectoryKey];
if (isDir) {
NSDirectoryEnumerator *enumerator = [fileManager
enumeratorAtURL:directoryURL
includingPropertiesForKeys:keys
options:0
errorHandler:^(NSURL *url, NSError *error) {
if (error) printf("[-] %s\n", [[error localizedDescription] UTF8String]);
return YES;
}];
for (NSURL *url in enumerator) {
NSError *error;
NSNumber *isDirectory = nil;
if (![url getResourceValue:&isDirectory forKey:NSURLIsDirectoryKey error:&error]) {
if (error) continue;
}
else if (![isDirectory boolValue]) {
int rv;
int fd;
uint8_t *p;
off_t sz;
struct stat st;
uint8_t buf[16];
char *fpath = strdup([[url path] UTF8String]);
if (strtail(fpath, ".plist") == 0 || strtail(fpath, ".nib") == 0 || strtail(fpath, ".strings") == 0 || strtail(fpath, ".png") == 0) {
continue;
}
rv = lstat(fpath, &st);
if (rv || !S_ISREG(st.st_mode) || st.st_size < 0x4000) {
continue;
}
fd = open(fpath, O_RDONLY);
if (fd < 0) {
continue;
}
sz = read(fd, buf, sizeof(buf));
if (sz != sizeof(buf)) {
close(fd);
continue;
}
if (*(uint32_t *)buf != 0xBEBAFECA && !MACHO(buf)) {
close(fd);
continue;
}
p = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (p == MAP_FAILED) {
close(fd);
continue;
}
[paths addObject:@(fpath)];
printf("[*] Will trust %s\n", fpath);
free(fpath);
}
}
if ([paths count] == 0) {
printf("[-] No files in %s passed the integrity checks!\n", path);
return -2;
}
}
else {
printf("[*] Will trust %s\n", path);
[paths addObject:@(path)];
int rv;
int fd;
uint8_t *p;
off_t sz;
struct stat st;
uint8_t buf[16];
if (strtail(path, ".plist") == 0 || strtail(path, ".nib") == 0 || strtail(path, ".strings") == 0 || strtail(path, ".png") == 0) {
printf("[-] Binary not an executable! Kernel doesn't like trusting data, geez\n");
return 2;
}
rv = lstat(path, &st);
if (rv || !S_ISREG(st.st_mode) || st.st_size < 0x4000) {
printf("[-] Binary too big\n");
return 3;
}
fd = open(path, O_RDONLY);
if (fd < 0) {
printf("[-] Don't have permission to open file\n");
return 4;
}
sz = read(fd, buf, sizeof(buf));
if (sz != sizeof(buf)) {
close(fd);
printf("[-] Failed to read from binary\n");
return 5;
}
if (*(uint32_t *)buf != 0xBEBAFECA && !MACHO(buf)) {
close(fd);
printf("[-] Binary not a macho!\n");
return 6;
}
p = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (p == MAP_FAILED) {
close(fd);
printf("[-] Failed to mmap file\n");
return 7;
}
}
uint64_t trust_chain = Find_trustcache();
printf("[*] trust_chain at 0x%llx\n", trust_chain);
struct trust_chain fake_chain;
fake_chain.next = KernelRead_64bits(trust_chain);
//((uint64_t*)fake_chain.uuid)[0] = 0xbadbabeabadbabe;
//((uint64_t*)fake_chain.uuid)[1] = 0xbadbabeabadbabe;
arc4random_buf(fake_chain.uuid, 16);
int cnt = 0;
uint8_t hash[CC_SHA256_DIGEST_LENGTH];
hash_t *allhash = malloc(sizeof(hash_t) * [paths count]);
for (int i = 0; i != [paths count]; ++i) {
uint8_t *cd = getCodeDirectory((char*)[[paths objectAtIndex:i] UTF8String]);
if (cd != NULL) {
getSHA256inplace(cd, hash);
memmove(allhash[cnt], hash, sizeof(hash_t));
++cnt;
}
else {
printf("[-] CD NULL\n");
continue;
}
}
fake_chain.count = cnt;
size_t length = (sizeof(fake_chain) + cnt * sizeof(hash_t) + 0x3FFF) & ~0x3FFF;
uint64_t kernel_trust = Kernel_alloc(length);
printf("[*] allocated: 0x%zx => 0x%llx\n", length, kernel_trust);
KernelWrite(kernel_trust, &fake_chain, sizeof(fake_chain));
KernelWrite(kernel_trust + sizeof(fake_chain), allhash, cnt * sizeof(hash_t));
#if __arm64e__
Kernel_Execute(Find_pmap_load_trust_cache_ppl(), kernel_trust, length, 0, 0, 0, 0, 0);
#else
KernelWrite_64bits(trust_chain, kernel_trust);
#endif
free(allhash);
return 0;
}
int trust_hash(hash_t hash) {
uint64_t trust_chain = Find_trustcache();
printf("[*] trust_chain at 0x%llx\n", trust_chain);
struct trust_chain fake_chain;
fake_chain.next = KernelRead_64bits(trust_chain);
//((uint64_t*)fake_chain.uuid)[0] = 0xbadbabeabadbabe;
//((uint64_t*)fake_chain.uuid)[1] = 0xbadbabeabadbabe;
arc4random_buf(fake_chain.uuid, 16);
fake_chain.count = 1;
size_t length = (sizeof(fake_chain) + sizeof(hash_t) + 0x3FFF) & ~0x3FFF;
uint64_t kernel_trust = Kernel_alloc(length);
printf("[*] allocated: 0x%zx => 0x%llx\n", length, kernel_trust);
KernelWrite(kernel_trust, &fake_chain, sizeof(fake_chain));
KernelWrite(kernel_trust + sizeof(fake_chain), hash, sizeof(hash_t));
#if __arm64e__
Kernel_Execute(Find_pmap_load_trust_cache_ppl(), kernel_trust, length, 0, 0, 0, 0, 0);
#else
KernelWrite_64bits(trust_chain, kernel_trust);
#endif
return 0;
}
static const char *csblob_parse_teamid(struct cs_blob *csblob) {
const CS_CodeDirectory *cd = csblob->csb_cd;
if (ntohl(KernelRead_32bits((uint64_t)cd + offsetof(CS_CodeDirectory, version))) < CS_SUPPORTSTEAMID) return 0;
if (KernelRead_32bits((uint64_t)cd + offsetof(CS_CodeDirectory, teamOffset)) == 0) return 0;
const char *name = ((const char *)cd) + ntohl(KernelRead_32bits((uint64_t)cd + offsetof(CS_CodeDirectory, teamOffset)));
return name;
}
int bypassCodeSign(const char *macho) {
uint64_t vnode = 0, addr = 0;
size_t blob_size = 0;
FILE *file = NULL;
CS_GenericBlob *buf_blob = NULL;
struct cs_blob *blob = NULL;
CS_CodeDirectory *rcd = NULL;
CS_GenericBlob *rentitlements = NULL;
// open
if ((file = fopen(macho, "rb")) == NULL) {
printf("[-] Failed to open file '%s'\n", macho);
goto error;
}
// get vnode
vnode = getVnodeAtPath(macho);
if (!vnode) {
printf("[-] Can't get vnode for file '%s'\n", macho);
goto error;
}
// get ubc_info
uint64_t ubc_info = KernelRead_64bits(vnode + off_v_ubcinfo);
if (!vnode) {
printf("[-] Can't get ubc_info for file '%s'\n", macho);
goto error;
}
// check if a cs_blob is already loaded, in which case there would be no need to do this
uint64_t cs_blob = KernelRead_64bits(ubc_info + off_ubcinfo_csblobs);
if (cs_blob) {
printf("[*] File '%s' already has a blob! Updating gen_count\n", macho);
KernelWrite_32bits(ubc_info + 44, KernelRead_32bits(Find_cs_gen_count()));
goto success;
}
//------ magic start here ------//
// see load_code_signature()
int64_t machOffset;
uint64_t lc_cmd = getCodeSignatureLC(file, &machOffset);
if (!lc_cmd || machOffset < 0) {
printf("[-] Can't find LC_CODE_SIGNATURE or binary is not arm64!\n");
goto error;
}
struct linkedit_data_command *lcp = load_bytes(file, lc_cmd, sizeof(struct linkedit_data_command));
lcp->dataoff += machOffset;
blob_size = lcp->datasize;
addr = Kernel_alloc(blob_size);
if (!addr) {
printf("[-] Failed to allocate\n");
goto error;
}
buf_blob = load_bytes(file, lcp->dataoff, lcp->datasize);
if (!buf_blob) {
printf("[-] Can't load blob\n");
goto error;
}
if (KernelWrite(addr, buf_blob, lcp->datasize) != lcp->datasize) {
printf("[-] Can't write!\n");
goto error;
}
// ubc_cs_blob_add:
// cs_blob_create_validated:
blob = malloc(sizeof(struct cs_blob));
blob->csb_mem_size = lcp->datasize;
blob->csb_mem_offset = 0;
blob->csb_mem_kaddr = addr;
blob->csb_flags = 0;
blob->csb_signer_type = CS_SIGNER_TYPE_UNKNOWN;
blob->csb_platform_binary = 0;
blob->csb_platform_path = 0;
blob->csb_teamid = NULL;
blob->csb_entitlements_blob = NULL;
blob->csb_entitlements = NULL;
blob->csb_reconstituted = false;
size_t length = lcp->datasize;
if (cs_validate_csblob((const uint8_t *)addr, length, &rcd, &rentitlements)) {
printf("[-] Invalid blob\n");
goto error;
}
const unsigned char *md_base;
uint8_t hash[CS_HASH_MAX_SIZE];
int md_size;
uint64_t cd = (uint64_t)rcd;
rcd = malloc(sizeof(CS_CodeDirectory));
KernelRead(cd, rcd, sizeof(CS_CodeDirectory));
uint64_t entitlements = 0;
if (rentitlements) {
entitlements = (uint64_t)rentitlements;
rentitlements = malloc(sizeof(CS_GenericBlob));
KernelRead(entitlements, rentitlements, sizeof(CS_GenericBlob));
}
blob->csb_cd = (const CS_CodeDirectory *)cd;
blob->csb_entitlements_blob = (const CS_GenericBlob *)entitlements;
blob->csb_hashtype = cs_find_md(rcd->hashType);
if (blob->csb_hashtype == NULL || KernelRead_64bits((uint64_t)blob->csb_hashtype + offsetof(struct cs_hash, cs_digest_size)) > sizeof(hash)) {
printf("[-] UNSUPPORTED TYPE. AM I SUPPOSED TO PANIC? Hmm...\n");
sleep(2);
printf("nah...");
goto error;
}
blob->csb_hash_pageshift = rcd->pageSize;
blob->csb_hash_pagesize = (1U << rcd->pageSize);
blob->csb_hash_pagemask = blob->csb_hash_pagesize - 1;
blob->csb_hash_firstlevel_pagesize = 0;
blob->csb_flags = (ntohl(rcd->flags) & CS_ALLOWED_MACHO) | CS_VALID;
blob->csb_end_offset = (((vm_offset_t)ntohl(rcd->codeLimit) + blob->csb_hash_pagemask) & ~((vm_offset_t)blob->csb_hash_pagemask));
if((ntohl(rcd->version) >= CS_SUPPORTSSCATTER) && (ntohl(rcd->scatterOffset))) {
const SC_Scatter *scatter = (const SC_Scatter*)
((const char*)rcd + ntohl(rcd->scatterOffset));
blob->csb_start_offset = ((off_t)ntohl(scatter->base)) * blob->csb_hash_pagesize;
} else {
blob->csb_start_offset = 0;
}
md_base = (const unsigned char *)cd;
md_size = ntohl(rcd->length);
// BAAAAAH
/*blob->csb_hashtype->cs_init(&mdctx);
blob->csb_hashtype->cs_update(&mdctx, md_base, md_size);
blob->csb_hashtype->cs_final(hash, &mdctx);*/
getSHA256inplace((uint8_t *)getCodeDirectory(macho), hash); // hash is not checked. it'll work with SHA1 as well
memcpy(blob->csb_cdhash, hash, CS_CDHASH_LEN);
// end cs_blob_create_validated
blob->csb_cpu_type = 0x0100000c; // assume arm64
blob->csb_base_offset = machOffset;
// vnode_check_signature:
blob->csb_signer_type = 0;
blob->csb_flags = 0x24000005;
blob->csb_platform_binary = 1;
// CoreTrustCheckThisBinaryPls():
// NAAAAH HAHA BYE BYE
// amfidCheckPls(): screw you too
// end fake vnode_check_signature()
// CoreTrust & amfid both returned success as you can see ^ \ssssss
vm_address_t new_mem_kaddr = 0;
vm_size_t new_mem_size = 0;
CS_CodeDirectory *new_cd = NULL;
CS_GenericBlob const *new_entitlements = NULL;
// ubc_cs_reconstitute_code_signature:
// Apple come on, why are these funcs not separate in the kernelcache but separate on XNU sources. it would have saved me so much time...
vm_offset_t new_blob_addr;
vm_size_t new_blob_size;
vm_size_t new_cdsize;
const CS_CodeDirectory *old_cd = blob->csb_cd;
new_cdsize = htonl(KernelRead_32bits((uint64_t)old_cd + offsetof(CS_CodeDirectory, length)));
new_blob_size = sizeof(CS_SuperBlob);
new_blob_size += sizeof(CS_BlobIndex);
new_blob_size += new_cdsize;
if (blob->csb_entitlements_blob) {
new_blob_size += sizeof(CS_BlobIndex);
new_blob_size += ntohl(KernelRead_32bits((uint64_t)blob->csb_entitlements_blob + offsetof(CS_GenericBlob, length)));
}
new_blob_addr = ubc_cs_blob_allocate(new_blob_size);
if (!new_blob_addr) {
printf("[-] Can't alloc\n");
goto error;
}
CS_SuperBlob *new_superblob = (CS_SuperBlob *)new_blob_addr;
KernelWrite_32bits((uint64_t)new_superblob + offsetof(CS_SuperBlob, magic), htonl(CSMAGIC_EMBEDDED_SIGNATURE));
KernelWrite_32bits((uint64_t)new_superblob + offsetof(CS_SuperBlob, length), htonl((uint32_t)new_blob_size));
if (blob->csb_entitlements_blob) {
vm_size_t ent_offset, cd_offset;
cd_offset = sizeof(CS_SuperBlob) + 2 * sizeof(CS_BlobIndex);
ent_offset = cd_offset + new_cdsize;
KernelWrite_32bits((uint64_t)new_superblob + offsetof(CS_SuperBlob, count), htonl(2));
KernelWrite_32bits((uint64_t)new_superblob + offsetof(CS_SuperBlob, index[0].type), htonl(CSSLOT_CODEDIRECTORY));
KernelWrite_32bits((uint64_t)new_superblob + offsetof(CS_SuperBlob, index[0].offset), htonl((uint32_t)cd_offset));
KernelWrite_32bits((uint64_t)new_superblob + offsetof(CS_SuperBlob, index[1].type), htonl(CSSLOT_ENTITLEMENTS));
KernelWrite_32bits((uint64_t)new_superblob + offsetof(CS_SuperBlob, index[1].offset), htonl((uint32_t)ent_offset));
void *buf = malloc(ntohl(KernelRead_32bits((uint64_t)blob->csb_entitlements_blob + offsetof(CS_GenericBlob, length))));
KernelRead((uint64_t)blob->csb_entitlements_blob, buf, ntohl(KernelRead_32bits((uint64_t)blob->csb_entitlements_blob + offsetof(CS_GenericBlob, length))));
KernelWrite((uint64_t)(new_blob_addr + ent_offset), buf, ntohl(KernelRead_32bits((uint64_t)blob->csb_entitlements_blob + offsetof(CS_GenericBlob, length))));
free(buf);
new_cd = (CS_CodeDirectory *)(new_blob_addr + cd_offset);
} else {
new_cd = (CS_CodeDirectory *)new_blob_addr;
}
void *buf = malloc(new_cdsize);
KernelRead((uint64_t)old_cd, buf, new_cdsize);
KernelWrite((uint64_t)new_cd, buf, new_cdsize);
free(buf);
vm_size_t len = new_blob_size;
CS_CodeDirectory *_cd = NULL;
CS_GenericBlob *_entitlements = NULL;
if (cs_validate_csblob((const uint8_t *)new_blob_addr, len, &_cd, &_entitlements)) {
printf("[-] Invalid blob\n");
kern_free(new_blob_addr, new_blob_size);
goto error;
}
new_entitlements = _entitlements;
new_mem_size = new_blob_size;
new_mem_kaddr = new_blob_addr;
// end ubc_cs_reconstitute_code_signature
Kernel_free(blob->csb_mem_kaddr, blob->csb_mem_size);
addr = 0;
blob->csb_mem_kaddr = new_mem_kaddr;
blob->csb_mem_size = new_mem_size;
blob->csb_cd = new_cd;
if (!new_entitlements) {
const char *newEntitlements = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
"<!DOCTYPE plist PUBLIC \"-//Apple//DTD PLIST 1.0//EN\" \"http://www.apple.com/DTDs/PropertyList-1.0.dtd\">"
"<plist version=\"1.0\">"
"<dict>"
"<key>platform-application</key>" // we're apple made :)
"<true/>"
"<key>com.apple.private.security.no-container</key>" // no container
"<true/>"
//"<key>com.apple.private.security.container-required</key>" // containermanagerd no crazy
//"<false/>"
"<key>get-task-allow</key>" // allow us to task_for_pid
"<true/>"
"<key>com.apple.private.skip-library-validation</key>" // allow invalid libs
"<true/>"
"</dict>"
"</plist>";
CS_GenericBlob *newBlob = malloc(sizeof(CS_GenericBlob) + strlen(newEntitlements) + 1);
if (!newBlob) {
printf("[-] Can't alloc new entitlements\n");
goto error;
}
newBlob->magic = ntohl(CSMAGIC_EMBEDDED_ENTITLEMENTS);
newBlob->length = ntohl(strlen(newEntitlements) + 1);
memcpy(newBlob->data, newEntitlements, strlen(newEntitlements) + 1);
new_entitlements = (CS_GenericBlob *)ubc_cs_blob_allocate(sizeof(CS_GenericBlob) + strlen(newEntitlements) + 1);
if (!new_entitlements) {
printf("[-] Can't alloc new entitlements on kernel\n");
free(blob);
goto error;
}
KernelWrite((uint64_t)new_entitlements, newBlob, sizeof(CS_GenericBlob) + strlen(newEntitlements) + 1);
free(newBlob);
}
blob->csb_entitlements_blob = new_entitlements;
uint64_t ents = Kernel_Execute(Find_osunserializexml(), (uint64_t)new_entitlements + offsetof(CS_GenericBlob, data), 0, 0, 0, 0, 0, 0);
if (ents) {
ents = ZmFixAddr(ents);
blob->csb_entitlements = (void *)ents;
uint64_t OSBoolTrue = Find_OSBoolean_True();
OSDictionary_SetItem(ents, "platform-application", OSBoolTrue);
OSDictionary_SetItem(ents, "com.apple.private.security.no-container", OSBoolTrue);
OSDictionary_SetItem(ents, "get-task-allow", OSBoolTrue);
OSDictionary_SetItem(ents, "com.apple.private.skip-library-validation", OSBoolTrue);
}
else {
printf("[?] Invalid entitlement blob??\n");
goto error;
}
blob->csb_reconstituted = true;
blob->csb_teamid = csblob_parse_teamid(blob);
off_t blob_start_offset = blob->csb_base_offset + blob->csb_start_offset;
off_t blob_end_offset = blob->csb_base_offset + blob->csb_end_offset;
if (blob_start_offset >= blob_end_offset || blob_start_offset < 0 || blob_end_offset <= 0) {
printf("[-] Invalid blob\n");
goto error;
}
// memory_object_signed()
uint64_t ui_control = KernelRead_64bits(ubc_info + 8);
uint64_t moc_object = KernelRead_64bits(ui_control + 8);
KernelWrite_32bits(moc_object + 168, (KernelRead_32bits(moc_object + 168) & 0xFFFFFEFF) | (1 << 8));
KernelWrite_32bits(ubc_info + 44, KernelRead_32bits(Find_cs_gen_count()));
blob->csb_next = 0;
// write it!
uint64_t kblob = ubc_cs_blob_allocate(sizeof(struct cs_blob));
KernelWrite(kblob, blob, sizeof(struct cs_blob));
KernelWrite_64bits(ubc_info + off_ubcinfo_csblobs, kblob);
if (strstr(macho, ".dylib")) {
uint32_t v_flags = KernelRead_32bits(vnode + off_v_flags);
KernelWrite_32bits(vnode + off_v_flags, v_flags | 0x200); // VSHARED_DYLD
}
printf("[?] Am I still alive?\n");
goto success;
//------ magic end here ------//
error:;
if (file) fclose(file);
if (vnode) vnode_put(vnode);
if (addr) kern_free(addr, blob_size);
if (blob) free(blob);
if (buf_blob) free(buf_blob);
if (rcd) free(rcd);
if (rentitlements) free(rentitlements);
printf("[-] Blob creation failed!\n");
return -1;
success:;
if (file) fclose(file);
if (vnode) vnode_put(vnode);
if (addr) kern_free(addr, blob_size);
if (blob) free(blob);
if (buf_blob) free(buf_blob);
if (rcd) free(rcd);
if (rentitlements) free(rentitlements);
printf("[+] Seems like we succeeded!\n");
return 0;
}
uint64_t unsandbox(pid_t pid) {
if (!pid) return NO;
printf("[*] Unsandboxing pid %d\n", pid);
uint64_t proc = proc_of_pid(pid); // pid's proccess structure on the kernel
printf("[i] Our proc in memory: 0x%llx\n", proc);
uint64_t ucred = KernelRead_64bits(proc + off_p_ucred); // pid credentials
printf("[i] Our ucreds: 0x%llx\n", ucred);
uint64_t cr_label = KernelRead_64bits(ucred + off_ucred_cr_label); // MAC label
printf("[i] cr_label: 0x%llx\n", cr_label);
uint64_t orig_sb = KernelRead_64bits(cr_label + off_sandbox_slot);
printf("[i] sandbox_slot: 0x%llx\n", orig_sb);
KernelWrite_64bits(cr_label + off_sandbox_slot /* First slot is AMFI's. so, this is second? */, 0); //get rid of sandbox by nullifying it
return (KernelRead_64bits(KernelRead_64bits(ucred + off_ucred_cr_label) + off_sandbox_slot) == 0) ? orig_sb : NO;
}
BOOL sandbox(pid_t pid, uint64_t sb) {
if (!pid) return NO;
printf("[*] Sandboxing pid %d with slot at 0x%llx\n", pid, sb);
uint64_t proc = proc_of_pid(pid); // pid's proccess structure on the kernel
uint64_t ucred = KernelRead_64bits(proc + off_p_ucred); // pid credentials
uint64_t cr_label = KernelRead_64bits(ucred + off_ucred_cr_label /* MAC label */);
KernelWrite_64bits(cr_label + off_sandbox_slot /* First slot is AMFI's. so, this is second? */, sb);
return (KernelRead_64bits(KernelRead_64bits(ucred + off_ucred_cr_label) + off_sandbox_slot) == sb) ? YES : NO;
}
BOOL setcsflags(pid_t pid) {
if (!pid) return NO;
uint64_t proc = proc_of_pid(pid);
uint32_t csflags = KernelRead_32bits(proc + off_p_csflags);
uint32_t newflags = (csflags | CS_PLATFORM_BINARY | CS_INSTALLER | CS_GET_TASK_ALLOW | CS_DEBUGGED) & ~(CS_RESTRICT | CS_HARD | CS_KILL);
KernelWrite_32bits(proc + off_p_csflags, newflags);
return (KernelRead_32bits(proc + off_p_csflags) == newflags) ? YES : NO;
}
BOOL rootify(pid_t pid) {
if (!pid) return NO;
uint64_t proc = proc_of_pid(pid);
printf("[i] Our proc in memory: 0x%llx\n", proc);
uint64_t ucred = KernelRead_64bits(proc + off_p_ucred);
printf("[i] ucred: 0x%llx\n", ucred);
//make everything 0 without setuid(0), pretty straightforward.
KernelWrite_32bits(proc + off_p_uid, 0);
KernelWrite_32bits(proc + off_p_ruid, 0);
KernelWrite_32bits(proc + off_p_gid, 0);
KernelWrite_32bits(proc + off_p_rgid, 0);
KernelWrite_32bits(ucred + off_ucred_cr_uid, 0);
KernelWrite_32bits(ucred + off_ucred_cr_ruid, 0);
KernelWrite_32bits(ucred + off_ucred_cr_svuid, 0);
KernelWrite_32bits(ucred + off_ucred_cr_ngroups, 1);
KernelWrite_32bits(ucred + off_ucred_cr_groups, 0);
KernelWrite_32bits(ucred + off_ucred_cr_rgid, 0);
KernelWrite_32bits(ucred + off_ucred_cr_svgid, 0);
return (KernelRead_32bits(proc + off_p_uid) == 0) ? YES : NO;
}
void platformize(pid_t pid) {
if (!pid) return;
uint64_t proc = proc_of_pid(pid);
uint64_t task = KernelRead_64bits(proc + off_task);
uint32_t t_flags = KernelRead_32bits(task + off_t_flags);
t_flags |= 0x400; // add TF_PLATFORM flag, = 0x400
KernelWrite_32bits(task+off_t_flags, t_flags);
uint32_t csflags = KernelRead_32bits(proc + off_p_csflags);
KernelWrite_32bits(proc + off_p_csflags, csflags | 0x24004001u); //patch csflags
}
BOOL entitlePidOnAMFI(pid_t pid, const char *ent, BOOL val) {
if (!pid) return NO;
uint64_t proc = proc_of_pid(pid);
uint64_t ucred = KernelRead_64bits(proc + off_p_ucred);
uint64_t cr_label = KernelRead_64bits(ucred + off_ucred_cr_label);
uint64_t entitlements = KernelRead_64bits(cr_label + off_amfi_slot);
if (OSDictionary_GetItem(entitlements, ent) == 0) {
printf("[*] Setting Entitlements...\n");
uint64_t entval = OSDictionary_GetItem(entitlements, ent);
printf("[i] before: %s is 0x%llx\n", ent, entval);
OSDictionary_SetItem(entitlements, ent, (val) ? Find_OSBoolean_True() : Find_OSBoolean_False());
entval = OSDictionary_GetItem(entitlements, ent);
printf("[i] after: %s is 0x%llx\n", ent, entval);
return (entval) ? YES : NO;
}
return YES;
}
BOOL patchEntitlements(pid_t pid, const char *entitlementString) {
if (!pid) return NO;
#define SWAP32(val) __builtin_bswap32(val)
struct cs_blob *csblob = malloc(sizeof(struct cs_blob));
CS_CodeDirectory *code_dir = malloc(sizeof(CS_CodeDirectory));
CS_GenericBlob *blob;
// our codesign blobs can be found at our vnode -> ubcinfo -> csblobs
uint64_t proc = proc_of_pid(pid);
uint64_t vnode = KernelRead_64bits(proc + off_p_textvp);
uint64_t ubc_info = KernelRead_64bits(vnode + off_v_ubcinfo);
uint64_t cs_blobs = KernelRead_64bits(ubc_info + off_ubcinfo_csblobs);
// read from there into the csblob struct
KernelRead(cs_blobs, csblob, sizeof(struct cs_blob));
uint64_t codeDirAddr = (uint64_t) csblob->csb_cd;
uint64_t entBlobAddr = (uint64_t) csblob->csb_entitlements_blob;
printf("[entitlePid][*] Code directory at 0x%llx\n", codeDirAddr);
printf("[entitlePid][*] Blob at 0x%llx\n", entBlobAddr);
// read into the code directory struct
KernelRead(codeDirAddr, code_dir, sizeof(CS_CodeDirectory));
if (SWAP32(code_dir->magic) != CSMAGIC_CODEDIRECTORY) {
printf("[entitlePid] Wrong magic! 0x%x != 0x%x\n", code_dir->magic, CSMAGIC_CODEDIRECTORY);
free(code_dir);
free(csblob);
return NO;
}
// get length of our current blob
// we use SWAP32 to convert big endian to little endian
uint32_t length = SWAP32(KernelRead_32bits(entBlobAddr + offsetof(CS_GenericBlob, length)));
if (length < 8) {
printf("[entitlePid] Blob too small!\n");
free(code_dir);
free(csblob);
return NO;
}
printf("[entitlePid][*] length = %d\n", length);
// allocate space for our new blob
blob = malloc(sizeof(CS_GenericBlob));
if (!blob) {
printf("[entitlePid][-] Ran out of memory? oops\n");
free(code_dir);
free(csblob);
return NO;
}
// read that much data into the CS_GenericBlob struct
KernelRead(entBlobAddr, blob, length);
if (strlen(entitlementString) + strlen("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<!DOCTYPE plist PUBLIC \"-//Apple//DTD PLIST 1.0//EN\" \"http://www.apple.com/DTDs/PropertyList-1.0.dtd\">\n"
"<plist version=\"1.0\">\n"
"<dict>\n\n</dict>\n"
"</plist>\n") > strlen(blob->data)) {
printf("[entitlePid] Sorry! You can't make the codesigning blob bigger! You have room for %lu bytes (including plist stuff)\n", strlen(blob->data));
free(code_dir);
free(csblob);
free(blob);
return NO;
// experimental
// this seems to work now
// but panic after some time after process quits
/* printf("[entitlePid][*] Blob is bigger than what we have, getting more room\n");
// calculate new length
uint32_t newLength = (uint32_t)(4 + 4 + strlen(entitlementString) +
strlen("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<!DOCTYPE plist PUBLIC \"-//Apple//DTD PLIST 1.0//EN\" \"http://www.apple.com/DTDs/PropertyList-1.0.dtd\">\n"
"<plist version=\"1.0\">\n"
"<dict>\n\n</dict>\n"
"</plist>\n") + 1); // magic + length + data + null terminator
// update length; BIG ENDIAN
blob->length = SWAP32(newLength);
// add more space on kernel
entBlobAddr = Kernel_alloc(newLength);
Kernel_Execute(Find_bzero(), entBlobAddr, newLength, 0, 0, 0, 0, 0);
// add old blob
KernelWrite(entBlobAddr, blob, length);
// update address
csblob->csb_entitlements_blob = (const CS_GenericBlob *)entBlobAddr;
KernelWrite(cs_blobs, csblob, sizeof(struct cs_blob));
// update hash
uint8_t newHash[CC_SHA256_DIGEST_LENGTH];
CC_SHA256(blob, newLength, (unsigned char *)newHash);
KernelWrite(codeDirAddr + SWAP32(code_dir->hashOffset) - CSSLOT_ENTITLEMENTS * code_dir->hashSize, newHash, sizeof(newHash));
length = newLength;
*/
}
uint8_t entHash[CC_SHA256_DIGEST_LENGTH];
uint8_t digest[CC_SHA256_DIGEST_LENGTH];
// make sure actual SHA256 hash of the blob matches the one on the code directory
KernelRead(codeDirAddr + SWAP32(code_dir->hashOffset) - CSSLOT_ENTITLEMENTS * code_dir->hashSize, entHash, sizeof(entHash));
CC_SHA256(blob, length, digest);
if (memcmp(entHash, digest, sizeof(digest))) {
printf("[entitlePid] Original hash doesn't match?\n");
free(blob);
free(code_dir);
free(csblob);
return NO;
}
// add our new entitlements
sprintf(blob->data,
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<!DOCTYPE plist PUBLIC \"-//Apple//DTD PLIST 1.0//EN\" \"http://www.apple.com/DTDs/PropertyList-1.0.dtd\">\n"
"<plist version=\"1.0\">\n"
"<dict>\n%s\n</dict>\n"
"</plist>\n", entitlementString);
// calculate the SHA256
CC_SHA256(blob, length, digest);
// write our new hash
KernelWrite(codeDirAddr + SWAP32(code_dir->hashOffset) - CSSLOT_ENTITLEMENTS * code_dir->hashSize, digest, sizeof(digest));
free(code_dir);
// write our new blob
KernelWrite(entBlobAddr, blob, length);
//KernelWrite_64bits((uint64_t) csblob->csb_entitlements, OSUnserializeXML(blob->data));