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patch.py
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import subprocess,lzma
import struct,os,re
from npk import NovaPackage,NpkPartID,NpkFileContainer
def replace_chunks(old_chunks,new_chunks,data,name):
pattern_parts = [re.escape(chunk) + b'(.{0,6})' for chunk in old_chunks[:-1]]
pattern_parts.append(re.escape(old_chunks[-1]))
pattern_bytes = b''.join(pattern_parts)
pattern = re.compile(pattern_bytes, flags=re.DOTALL)
def replace_match(match):
replaced = b''.join([new_chunks[i] + match.group(i+1) for i in range(len(new_chunks) - 1)])
replaced += new_chunks[-1]
print(f'{name} public key patched {b"".join(old_chunks)[:16].hex().upper()}...')
return replaced
return re.sub(pattern, replace_match, data)
def replace_key(old,new,data,name=''):
old_chunks = [old[i:i+4] for i in range(0, len(old), 4)]
new_chunks = [new[i:i+4] for i in range(0, len(new), 4)]
data = replace_chunks(old_chunks, new_chunks, data,name)
key_map = [28,19,25,16,14,3,24,15,22,8,6,17,11,7,9,23,18,13,10,0,26,21,2,5,20,30,31,4,27,29,1,12,]
old_chunks = [bytes([old[i]]) for i in key_map]
new_chunks = [bytes([new[i]]) for i in key_map]
data = replace_chunks(old_chunks, new_chunks, data,name)
if 'ARCH' in os.environ and os.environ['ARCH'] == '-arm64' and os.environ['LATEST_VERSION'] == '7.17.2':
old_bytes = old_chunks[4] + old_chunks[5] + old_chunks[2] + old_chunks[0] + old_chunks[1] + old_chunks[6] + old_chunks[7]
new_bytes = new_chunks[4] + new_chunks[5] + new_chunks[2] + new_chunks[0] + new_chunks[1] + new_chunks[6] + new_chunks[7]
if old_bytes in data:
print(f'{name} public key patched {old[:16].hex().upper()}...')
data = data.replace(old_bytes,new_bytes)
old_codes = [bytes.fromhex('793583E2'),bytes.fromhex('FD3A83E2'),bytes.fromhex('193D83E2')]
new_codes = [bytes.fromhex('FF34A0E3'),bytes.fromhex('753C83E2'),bytes.fromhex('FC3083E2')]
data = replace_chunks(old_codes, new_codes, data,name)
return data
def patch_bzimage(data:bytes,key_dict:dict):
PE_TEXT_SECTION_OFFSET = 414
HEADER_PAYLOAD_OFFSET = 584
HEADER_PAYLOAD_LENGTH_OFFSET = HEADER_PAYLOAD_OFFSET + 4
text_section_raw_data = struct.unpack_from('<I',data,PE_TEXT_SECTION_OFFSET)[0]
payload_offset = text_section_raw_data +struct.unpack_from('<I',data,HEADER_PAYLOAD_OFFSET)[0]
payload_length = struct.unpack_from('<I',data,HEADER_PAYLOAD_LENGTH_OFFSET)[0]
payload_length = payload_length - 4 #last 4 bytes is uncompressed size(z_output_len)
z_output_len = struct.unpack_from('<I',data,payload_offset+payload_length)[0]
vmlinux_xz = data[payload_offset:payload_offset+payload_length]
vmlinux = lzma.decompress(vmlinux_xz)
assert z_output_len == len(vmlinux), 'vmlinux size is not equal to expected'
CPIO_HEADER_MAGIC = b'07070100'
CPIO_FOOTER_MAGIC = b'TRAILER!!!\x00\x00\x00\x00' #545241494C455221212100000000
cpio_offset1 = vmlinux.index(CPIO_HEADER_MAGIC)
initramfs = vmlinux[cpio_offset1:]
cpio_offset2 = initramfs.index(CPIO_FOOTER_MAGIC)+len(CPIO_FOOTER_MAGIC)
initramfs = initramfs[:cpio_offset2]
new_initramfs = initramfs
for old_public_key,new_public_key in key_dict.items():
new_initramfs = replace_key(old_public_key,new_public_key,new_initramfs,'initramfs')
new_vmlinux = vmlinux.replace(initramfs,new_initramfs)
new_vmlinux_xz = lzma.compress(new_vmlinux,check=lzma.CHECK_CRC32,filters=[
{"id": lzma.FILTER_X86},
{"id": lzma.FILTER_LZMA2,
"preset": 9 | lzma.PRESET_EXTREME,
'dict_size': 32*1024*1024,
"lc": 4,"lp": 0, "pb": 0,
},
])
new_payload_length = len(new_vmlinux_xz)
assert new_payload_length <= payload_length , 'new vmlinux.xz size is too big'
new_payload_length = new_payload_length + 4 #last 4 bytes is uncompressed size(z_output_len)
new_data = bytearray(data)
struct.pack_into('<I',new_data,HEADER_PAYLOAD_LENGTH_OFFSET,new_payload_length)
vmlinux_xz += struct.pack('<I',z_output_len)
new_vmlinux_xz += struct.pack('<I',z_output_len)
new_vmlinux_xz = new_vmlinux_xz.ljust(len(vmlinux_xz),b'\0')
new_data = new_data.replace(vmlinux_xz,new_vmlinux_xz)
return new_data
def patch_block(dev:str,file:str,key_dict):
BLOCK_SIZE = 4096
#sudo debugfs /dev/nbd0p1 -R 'stats' | grep "Block size" | sed -n '1p' | cut -d ':' -f 2
#sudo debugfs /dev/nbd0p1 -R 'stat boot/initrd.rgz' 2> /dev/null | sed -n '11p'
stdout,_ = run_shell_command(f"debugfs {dev} -R 'stat {file}' 2> /dev/null | sed -n '11p' ")
#(0-11):1592-1603, (IND):1173, (12-15):1604-1607, (16-26):1424-1434
blocks_info = stdout.decode().strip().split(',')
print(f'blocks_info : {blocks_info}')
blocks = []
ind_block_id = None
for block_info in blocks_info:
_tmp = block_info.strip().split(':')
if _tmp[0].strip() == '(IND)':
ind_block_id = int(_tmp[1])
else:
print(f'block_info : {block_info}')
id_range = _tmp[0].strip().replace('(','').replace(')','').split('-')
block_range = _tmp[1].strip().replace('(','').replace(')','').split('-')
blocks += [id for id in range(int(block_range[0]),int(block_range[1])+1)]
print(f' blocks : {len(blocks)} ind_block_id : {ind_block_id}')
#sudo debugfs /dev/nbd0p1 -R 'cat boot/initrd.rgz' > data
data,stderr = run_shell_command(f"debugfs {dev} -R 'cat {file}' 2> /dev/null")
new_data = patch_kernel(data,key_dict)
print(f'write block {len(blocks)} : [',end="")
with open(dev,'wb') as f:
for index,block_id in enumerate(blocks):
print('#',end="")
f.seek(block_id*BLOCK_SIZE)
f.write(new_data[index*BLOCK_SIZE:(index+1)*BLOCK_SIZE])
f.flush()
print(']')
def patch_initrd_xz(initrd_xz:bytes,key_dict:dict,ljust=True):
initrd = lzma.decompress(initrd_xz)
new_initrd = initrd
for old_public_key,new_public_key in key_dict.items():
new_initrd = replace_key(old_public_key,new_public_key,new_initrd,'initrd')
preset = 6
new_initrd_xz = lzma.compress(new_initrd,check=lzma.CHECK_CRC32,filters=[{"id": lzma.FILTER_LZMA2, "preset": preset }] )
while len(new_initrd_xz) > len(initrd_xz) and preset < 9:
print(f'preset:{preset}')
print(f'new initrd xz size:{len(new_initrd_xz)}')
print(f'old initrd xz size:{len(initrd_xz)}')
preset += 1
new_initrd_xz = lzma.compress(new_initrd,check=lzma.CHECK_CRC32,filters=[{"id": lzma.FILTER_LZMA2, "preset": preset }] )
if len(new_initrd_xz) > len(initrd_xz):
new_initrd_xz = lzma.compress(new_initrd,check=lzma.CHECK_CRC32,filters=[{"id": lzma.FILTER_LZMA2, "preset": 9 | lzma.PRESET_EXTREME,'dict_size': 32*1024*1024,"lc": 4,"lp": 0, "pb": 0,}] )
if ljust:
print(f'preset:{preset}')
print(f'new initrd xz size:{len(new_initrd_xz)}')
print(f'old initrd xz size:{len(initrd_xz)}')
print(f'ljust size:{len(initrd_xz)-len(new_initrd_xz)}')
assert len(new_initrd_xz) <= len(initrd_xz),'new initrd xz size is too big'
new_initrd_xz = new_initrd_xz.ljust(len(initrd_xz),b'\0')
return new_initrd_xz
def find_7zXZ_data(data:bytes):
offset1 = 0
_data = data
while b'\xFD7zXZ\x00\x00\x01' in _data:
offset1 = offset1 + _data.index(b'\xFD7zXZ\x00\x00\x01') + 8
_data = _data[offset1:]
offset1 -= 8
offset2 = 0
_data = data
while b'\x00\x00\x00\x00\x01\x59\x5A' in _data:
offset2 = offset2 + _data.index(b'\x00\x00\x00\x00\x01\x59\x5A') + 7
_data = _data[offset2:]
print(f'found 7zXZ data offset:{offset1} size:{offset2-offset1}')
return data[offset1:offset2]
def patch_elf(data: bytes,key_dict:dict):
initrd_xz = find_7zXZ_data(data)
new_initrd_xz = patch_initrd_xz(initrd_xz,key_dict)
return data.replace(initrd_xz,new_initrd_xz)
def patch_pe(data: bytes,key_dict:dict):
vmlinux_xz = find_7zXZ_data(data)
vmlinux = lzma.decompress(vmlinux_xz)
initrd_xz_offset = vmlinux.index(b'\xFD7zXZ\x00\x00\x01')
initrd_xz_size = vmlinux[initrd_xz_offset:].index(b'\x00\x00\x00\x00\x01\x59\x5A') + 7
initrd_xz = vmlinux[initrd_xz_offset:initrd_xz_offset+initrd_xz_size]
new_initrd_xz = patch_initrd_xz(initrd_xz,key_dict)
new_vmlinux = vmlinux.replace(initrd_xz,new_initrd_xz)
new_vmlinux_xz = lzma.compress(new_vmlinux,check=lzma.CHECK_CRC32,filters=[{"id": lzma.FILTER_LZMA2, "preset": 9,}] )
assert len(new_vmlinux_xz) <= len(vmlinux_xz),'new vmlinux xz size is too big'
print(f'new vmlinux xz size:{len(new_vmlinux_xz)}')
print(f'old vmlinux xz size:{len(vmlinux_xz)}')
print(f'ljust size:{len(vmlinux_xz)-len(new_vmlinux_xz)}')
new_vmlinux_xz = new_vmlinux_xz.ljust(len(vmlinux_xz),b'\0')
new_data = data.replace(vmlinux_xz,new_vmlinux_xz)
return new_data
def patch_netinstall(key_dict: dict,input_file,output_file=None):
netinstall = open(input_file,'rb').read()
if netinstall[:2] == b'MZ':
from package import check_install_package
check_install_package(['pefile'])
import pefile
ROUTEROS_BOOT = {
129:{'arch':'power','name':'Powerboot'},
130:{'arch':'e500','name':'e500_boot'},
131:{'arch':'mips','name':'Mips_boot'},
135:{'arch':'400','name':'440__boot'},
136:{'arch':'tile','name':'tile_boot'},
137:{'arch':'arm','name':'ARM__boot'},
138:{'arch':'mmips','name':'MMipsBoot'},
139:{'arch':'arm64','name':'ARM64__boot'},
143:{'arch':'x86_64','name':'x86_64boot'}
}
with pefile.PE(input_file) as pe:
for resource in pe.DIRECTORY_ENTRY_RESOURCE.entries:
if resource.id == pefile.RESOURCE_TYPE["RT_RCDATA"]:
for sub_resource in resource.directory.entries:
if sub_resource.id in ROUTEROS_BOOT:
bootloader = ROUTEROS_BOOT[sub_resource.id]
print(f'found {bootloader["arch"]}({sub_resource.id}) bootloader')
rva = sub_resource.directory.entries[0].data.struct.OffsetToData
size = sub_resource.directory.entries[0].data.struct.Size
data = pe.get_data(rva,size)
_size = struct.unpack('<I',data[:4])[0]
_data = data[4:4+_size]
try:
if _data[:2] == b'MZ':
new_data = patch_pe(_data,key_dict)
elif _data[:4] == b'\x7FELF':
new_data = patch_elf(_data,key_dict)
else:
raise Exception(f'unknown bootloader format {_data[:4].hex().upper()}')
except Exception as e:
print(f'patch {bootloader["arch"]}({sub_resource.id}) bootloader failed {e}')
new_data = _data
new_data = struct.pack("<I",_size) + new_data.ljust(len(_data),b'\0')
new_data = new_data.ljust(size,b'\0')
pe.set_bytes_at_rva(rva,new_data)
pe.write(output_file or input_file)
elif netinstall[:4] == b'\x7FELF':
import re
# 83 00 00 00 C4 68 C4 0B 5A C2 04 08 10 9E 52 00
# 8A 00 00 00 C3 68 C4 0B 6A 60 57 08 C0 3D 54 00
# 81 00 00 00 D3 68 C4 0B 2A 9E AB 08 5C 1B 78 00
# 82 00 00 00 E8 6B C4 0B 86 B9 23 09 78 01 82 00
# 87 00 00 00 ED 6B C4 0B FE BA A5 09 44 BF 7B 00
# 89 00 00 00 0C 6A C4 0B 42 7A 21 0A C4 1D 3E 00
# 8B 00 00 00 1E 69 C4 0B 06 98 5F 0A 28 95 5E 00
# 8C 00 00 00 F1 6B C4 0B 2E 2D BE 0A 78 EA 5D 00
# 88 00 00 00 03 69 C4 0B A6 17 1C 0B 28 55 4A 00
# 8F 00 00 00 FC 6B C4 0B CE 6C 66 0B E0 E8 58 00
SECTION_HEADER_OFFSET_IN_FILE = struct.unpack_from(b'<I',netinstall[0x20:])[0]
SECTION_HEADER_ENTRY_SIZE = struct.unpack_from(b'<H',netinstall[0x2E:])[0]
NUMBER_OF_SECTION_HEADER_ENTRIES = struct.unpack_from(b'<H',netinstall[0x30:])[0]
STRING_TABLE_INDEX = struct.unpack_from(b'<H',netinstall[0x32:])[0]
section_name_offset = SECTION_HEADER_OFFSET_IN_FILE + STRING_TABLE_INDEX * SECTION_HEADER_ENTRY_SIZE + 16
SECTION_NAME_BLOCK = struct.unpack_from(b'<I',netinstall[section_name_offset:])[0]
for i in range(NUMBER_OF_SECTION_HEADER_ENTRIES):
section_offset = SECTION_HEADER_OFFSET_IN_FILE + i * SECTION_HEADER_ENTRY_SIZE
name_offset,_,_,addr,offset = struct.unpack_from('<IIIII',netinstall[section_offset:])
name = netinstall[SECTION_NAME_BLOCK+name_offset:].split(b'\0')[0]
if name == b'.text':
print(f'found .text section at {hex(offset)} addr {hex(addr)}')
text_section_addr = addr
text_section_offset = offset
break
offset = re.search(rb'\x83\x00\x00\x00.{12}\x8A\x00\x00\x00.{12}\x81\x00\x00\x00.{12}',netinstall).start()
print(f'found bootloaders offset {hex(offset)}')
for i in range(10):
id,name_ptr,data_ptr,data_size = struct.unpack_from('<IIII',netinstall[offset+i*16:offset+i*16+16])
name = netinstall[text_section_offset+name_ptr-text_section_addr:].split(b'\0')[0]
data = netinstall[text_section_offset+data_ptr-text_section_addr:text_section_offset+data_ptr-text_section_addr+data_size]
print(f'found {name.decode()}({id}) bootloader offset {hex(text_section_offset+data_ptr-text_section_addr)} size {data_size}')
try:
if data[:2] == b'MZ':
new_data = patch_pe(data,key_dict)
elif data[:4] == b'\x7FELF':
new_data = patch_elf(data,key_dict)
else:
raise Exception(f'unknown bootloader format {data[:4].hex().upper()}')
except Exception as e:
print(f'patch {name.decode()}({id}) bootloader failed {e}')
new_data = data
new_data = new_data.ljust(len(data),b'\0')
netinstall = netinstall.replace(data,new_data)
open(output_file or input_file,'wb').write(netinstall)
def patch_kernel(data:bytes,key_dict):
if data[:2] == b'MZ':
print('patching EFI Kernel')
if data[56:60] == b'ARM\x64':
print('patching arm64')
return patch_elf(data,key_dict)
else:
print('patching x86_64')
return patch_bzimage(data,key_dict)
elif data[:4] == b'\x7FELF':
print('patching ELF')
return patch_elf(data,key_dict)
elif data[:5] == b'\xFD7zXZ':
print('patching initrd')
return patch_initrd_xz(data,key_dict)
else:
raise Exception('unknown kernel format')
def patch_squashfs(path,key_dict):
for root, dirs, files in os.walk(path):
for file in files:
if file =='loader':
continue
file = os.path.join(root,file)
if os.path.isfile(file):
data = open(file,'rb').read()
for old_public_key,new_public_key in key_dict.items():
_data = replace_key(old_public_key,new_public_key,data,file)
if _data != data:
open(file,'wb').write(_data)
url_dict = {
os.environ['MIKRO_LICENCE_URL'].encode():os.environ['CUSTOM_LICENCE_URL'].encode(),
os.environ['MIKRO_UPGRADE_URL'].encode():os.environ['CUSTOM_UPGRADE_URL'].encode(),
os.environ['MIKRO_CLOUD_URL'].encode():os.environ['CUSTOM_CLOUD_URL'].encode(),
os.environ['MIKRO_CLOUD_PUBLIC_KEY'].encode():os.environ['CUSTOM_CLOUD_PUBLIC_KEY'].encode(),
}
data = open(file,'rb').read()
for old_url,new_url in url_dict.items():
if old_url in data:
print(f'{file} url patched {old_url.decode()[:7]}...')
data = data.replace(old_url,new_url)
open(file,'wb').write(data)
if os.path.split(file)[1] == 'licupgr':
url_dict = {
os.environ['MIKRO_RENEW_URL'].encode():os.environ['CUSTOM_RENEW_URL'].encode(),
}
for old_url,new_url in url_dict.items():
if old_url in data:
print(f'{file} url patched {old_url.decode()[:7]}...')
data = data.replace(old_url,new_url)
open(file,'wb').write(data)
def run_shell_command(command):
process = subprocess.run(command, shell=True, check=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
return process.stdout, process.stderr
def patch_npk_package(package,key_dict):
if package[NpkPartID.NAME_INFO].data.name == 'system':
file_container = NpkFileContainer.unserialize_from(package[NpkPartID.FILE_CONTAINER].data)
for item in file_container:
if item.name in [b'boot/EFI/BOOT/BOOTX64.EFI',b'boot/kernel',b'boot/initrd.rgz']:
print(f'patch {item.name} ...')
item.data = patch_kernel(item.data,key_dict)
package[NpkPartID.FILE_CONTAINER].data = file_container.serialize()
squashfs_file = 'squashfs-root.sfs'
extract_dir = 'squashfs-root'
open(squashfs_file,'wb').write(package[NpkPartID.SQUASHFS].data)
print(f"extract {squashfs_file} ...")
run_shell_command(f"unsquashfs -d {extract_dir} {squashfs_file}")
patch_squashfs(extract_dir,key_dict)
logo = os.path.join(extract_dir,"nova/lib/console/logo.txt")
run_shell_command(f"sudo sed -i '1d' {logo}")
run_shell_command(f"sudo sed -i '8s#.*# elseif@live.cn https://github.com/elseif/MikroTikPatch#' {logo}")
print(f"pack {extract_dir} ...")
run_shell_command(f"rm -f {squashfs_file}")
run_shell_command(f"mksquashfs {extract_dir} {squashfs_file} -quiet -comp xz -no-xattrs -b 256k")
print(f"clean ...")
run_shell_command(f"rm -rf {extract_dir}")
package[NpkPartID.SQUASHFS].data = open(squashfs_file,'rb').read()
run_shell_command(f"rm -f {squashfs_file}")
def patch_npk_file(key_dict,kcdsa_private_key,eddsa_private_key,input_file,output_file=None):
npk = NovaPackage.load(input_file)
if len(npk._packages) > 0:
for package in npk._packages:
patch_npk_package(package,key_dict)
else:
patch_npk_package(npk,key_dict)
npk.sign(kcdsa_private_key,eddsa_private_key)
npk.save(output_file or input_file)
if __name__ == '__main__':
import argparse,os
parser = argparse.ArgumentParser(description='MikroTik patcher')
subparsers = parser.add_subparsers(dest="command")
npk_parser = subparsers.add_parser('npk',help='patch and sign npk file')
npk_parser.add_argument('input',type=str, help='Input file')
npk_parser.add_argument('-O','--output',type=str,help='Output file')
kernel_parser = subparsers.add_parser('kernel',help='patch kernel file')
kernel_parser.add_argument('input',type=str, help='Input file')
kernel_parser.add_argument('-O','--output',type=str,help='Output file')
block_parser = subparsers.add_parser('block',help='patch block file')
block_parser.add_argument('dev',type=str, help='block device')
block_parser.add_argument('file',type=str, help='file path')
netinstall_parser = subparsers.add_parser('netinstall',help='patch netinstall file')
netinstall_parser.add_argument('input',type=str, help='Input file')
netinstall_parser.add_argument('-O','--output',type=str,help='Output file')
args = parser.parse_args()
key_dict = {
bytes.fromhex(os.environ['MIKRO_LICENSE_PUBLIC_KEY']):bytes.fromhex(os.environ['CUSTOM_LICENSE_PUBLIC_KEY']),
bytes.fromhex(os.environ['MIKRO_NPK_SIGN_PUBLIC_KEY']):bytes.fromhex(os.environ['CUSTOM_NPK_SIGN_PUBLIC_KEY'])
}
kcdsa_private_key = bytes.fromhex(os.environ['CUSTOM_LICENSE_PRIVATE_KEY'])
eddsa_private_key = bytes.fromhex(os.environ['CUSTOM_NPK_SIGN_PRIVATE_KEY'])
if args.command =='npk':
print(f'patching {args.input} ...')
patch_npk_file(key_dict,kcdsa_private_key,eddsa_private_key,args.input,args.output)
elif args.command == 'kernel':
print(f'patching {args.input} ...')
data = patch_kernel(open(args.input,'rb').read(),key_dict)
open(args.output or args.input,'wb').write(data)
elif args.command == 'block':
print(f'patching {args.file} in {args.dev} ...')
patch_block(args.dev,args.file,key_dict)
elif args.command == 'netinstall':
print(f'patching {args.input} ...')
patch_netinstall(key_dict,args.input,args.output)
else:
parser.print_help()