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pyc_code.cpp
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#include "pyc_code.h"
#include "pyc_module.h"
#include "data.h"
#include "plusaes.hpp"
/* == Marshal structure for Code object ==
1.0 1.3 1.5 2.1 2.3 3.0 3.8 3.11
argcount short short short long long long long
posonlyargc long long
kwonlyargc long long long
nlocals short short short long long long
stacksize short short long long long long
flags short short short long long long long
code Obj Obj Obj Obj Obj Obj Obj Obj
consts Obj Obj Obj Obj Obj Obj Obj Obj
names Obj Obj Obj Obj Obj Obj Obj Obj
varnames Obj Obj Obj Obj Obj Obj
freevars Obj Obj Obj Obj
cellvars Obj Obj Obj Obj
locals+names Obj
locals+kinds Obj
filename Obj Obj Obj Obj Obj Obj Obj Obj
name Obj Obj Obj Obj Obj Obj Obj Obj
qualname Obj
firstline short short long long long long
lntable Obj Obj Obj Obj Obj Obj
exceptiontable Obj
*/
void PycCode::load(PycData* stream, PycModule* mod)
{
if (mod->verCompare(1, 3) >= 0 && mod->verCompare(2, 3) < 0)
m_argCount = stream->get16();
else if (mod->verCompare(2, 3) >= 0)
m_argCount = stream->get32();
if (mod->verCompare(3, 8) >= 0)
m_posOnlyArgCount = stream->get32();
else
m_posOnlyArgCount = 0;
if (mod->majorVer() >= 3)
m_kwOnlyArgCount = stream->get32();
else
m_kwOnlyArgCount = 0;
if (mod->verCompare(1, 3) >= 0 && mod->verCompare(2, 3) < 0)
m_numLocals = stream->get16();
else if (mod->verCompare(2, 3) >= 0 && mod->verCompare(3, 11) < 0)
m_numLocals = stream->get32();
else
m_numLocals = 0;
if (mod->verCompare(1, 5) >= 0 && mod->verCompare(2, 3) < 0)
m_stackSize = stream->get16();
else if (mod->verCompare(2, 3) >= 0)
m_stackSize = stream->get32();
else
m_stackSize = 0;
if (mod->verCompare(1, 3) >= 0 && mod->verCompare(2, 3) < 0)
m_flags = stream->get16();
else if (mod->verCompare(2, 3) >= 0)
m_flags = stream->get32();
else
m_flags = 0;
bool pyarmor_co_obfuscated_flag = m_flags & 0x20000000;
if (mod->verCompare(3, 8) < 0) {
// Remap flags to new values introduced in 3.8
// Pyarmor CO_OBFUSCATED flag always locates at 0x20000000
if (m_flags & 0xD0000000)
fprintf(stderr, "Remapping flags (%08X) may not be correct\n", m_flags);
m_flags = (m_flags & 0x1FFF) | ((m_flags & 0xFFFE000) << 4) | (m_flags & 0x20000000);
}
m_code = LoadObject(stream, mod).cast<PycString>();
m_consts = LoadObject(stream, mod).cast<PycSequence>();
m_names = LoadObject(stream, mod).cast<PycSequence>();
if (mod->verCompare(1, 3) >= 0)
m_localNames = LoadObject(stream, mod).cast<PycSequence>();
else
m_localNames = new PycTuple;
if (mod->verCompare(3, 11) >= 0)
m_localKinds = LoadObject(stream, mod).cast<PycString>();
else
m_localKinds = new PycString;
if (mod->verCompare(2, 1) >= 0 && mod->verCompare(3, 11) < 0)
m_freeVars = LoadObject(stream, mod).cast<PycSequence>();
else
m_freeVars = new PycTuple;
if (mod->verCompare(2, 1) >= 0 && mod->verCompare(3, 11) < 0)
m_cellVars = LoadObject(stream, mod).cast<PycSequence>();
else
m_cellVars = new PycTuple;
m_fileName = LoadObject(stream, mod).cast<PycString>();
m_name = LoadObject(stream, mod).cast<PycString>();
if (mod->verCompare(3, 11) >= 0)
m_qualName = LoadObject(stream, mod).cast<PycString>();
else
m_qualName = new PycString;
if (mod->verCompare(1, 5) >= 0 && mod->verCompare(2, 3) < 0)
m_firstLine = stream->get16();
else if (mod->verCompare(2, 3) >= 0)
m_firstLine = stream->get32();
if (mod->verCompare(1, 5) >= 0)
m_lnTable = LoadObject(stream, mod).cast<PycString>();
else
m_lnTable = new PycString;
if (mod->verCompare(3, 11) >= 0)
m_exceptTable = LoadObject(stream, mod).cast<PycString>();
else
m_exceptTable = new PycString;
// Pyarmor extra fields
if (!pyarmor_co_obfuscated_flag)
return;
unsigned char extra_data[256] = {0};
unsigned char extra_length = stream->getByte();
stream->getBuffer(extra_length, extra_data);
unsigned char pyarmor_fn_count = extra_data[0] & 3;
unsigned char pyarmor_co_descriptor_count = (extra_data[0] >> 2) & 3;
if (extra_data[0] & 0xF0)
{
fprintf(stderr, "Unsupported Pyarmor CO extra flag (%02X)\n", extra_data[0]);
fprintf(stderr, "Please open an issue at https://github.com/Lil-House/Pyarmor-Static-Unpack-1shot/issues to request support and help to make this tool better.\n");
}
if (pyarmor_co_descriptor_count > 1)
{
fprintf(stderr, "Do not support multiple Pyarmor CO descriptors (%d in total)\n", pyarmor_co_descriptor_count);
fprintf(stderr, "Please open an issue at https://github.com/Lil-House/Pyarmor-Static-Unpack-1shot/issues to request support and help to make this tool better.\n");
}
unsigned char *extra_ptr = extra_data + 4;
for (unsigned char i = 0; i < pyarmor_fn_count; i++)
{
unsigned char item_length = (*extra_ptr >> 6) + 2;
// Ignore the details
extra_ptr += item_length;
}
for (unsigned char i = 0; i < pyarmor_co_descriptor_count; i++)
{
unsigned char item_length = (*extra_ptr >> 6) + 2;
unsigned char *item_end = extra_ptr + item_length;
// Ignore low 6 bits
extra_ptr++;
unsigned long consts_index = 0;
while (extra_ptr < item_end)
{
consts_index = (consts_index << 8) | *extra_ptr;
extra_ptr++;
}
pyarmorDecryptCoCode(consts_index, mod);
}
}
void PycCode::pyarmorDecryptCoCode(unsigned long consts_index, PycModule *mod)
{
PycRef<PycString> descriptor = getConst(consts_index).cast<PycString>();
const std::string &descriptor_str = descriptor->strValue();
if (descriptor_str.length() < 20)
{
fprintf(stderr, "Pyarmor CO descriptor is too short\n");
return;
}
const PyarmorCoDescriptor *desc = (const PyarmorCoDescriptor *)(descriptor_str.data() + 8);
bool copy_prologue = desc->flags & 0x8;
bool xor_aes_nonce = desc->flags & 0x4;
bool short_code = desc->flags & 0x2;
unsigned int nonce_index = short_code
? desc->short_nonce_index
: desc->short_nonce_index + desc->decrypt_begin_index + desc->decrypt_length;
unsigned char nonce[16] = {0};
memcpy(nonce, m_code->value() + nonce_index, 12);
nonce[15] = 2;
if (xor_aes_nonce)
{
if (!mod->pyarmor_co_code_aes_nonce_xor_enabled)
{
fprintf(stderr, "FATAL: Pyarmor CO code AES nonce XOR is not enabled but used\n");
}
else
{
unsigned char *xor_key = mod->pyarmor_co_code_aes_nonce_xor_key;
for (int i = 0; i < 12; i++)
nonce[i] ^= xor_key[i];
}
}
std::string &code_bytes = (std::string &)m_code->strValue();
plusaes::crypt_ctr(
(unsigned char *)&code_bytes[desc->decrypt_begin_index],
desc->decrypt_length,
mod->pyarmor_aes_key,
16,
&nonce);
if (copy_prologue)
{
memcpy(
&code_bytes[0],
&code_bytes[desc->decrypt_length],
desc->decrypt_begin_index);
// Assume tail of code is not used there
memset(
&code_bytes[desc->decrypt_length],
9, // NOP
desc->decrypt_begin_index);
}
// When running, the first 8 bytes are set to &PyCodeObject
std::string new_str = "<COAddr>" + descriptor_str.substr(8);
descriptor->setValue(new_str);
}
PycRef<PycString> PycCode::getCellVar(PycModule* mod, int idx) const
{
if (mod->verCompare(3, 11) >= 0)
return getLocal(idx);
return (idx >= m_cellVars->size())
? m_freeVars->get(idx - m_cellVars->size()).cast<PycString>()
: m_cellVars->get(idx).cast<PycString>();
}