_xeroxz
2 years ago
parent
c666bf8dbe
commit
9cf6cc8f03
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#pragma once
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#include <algorithm>
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#include <comp/obf/pass.hpp>
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#include <vector>
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namespace theo::comp::obf {
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class engine_t {
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explicit engine_t(){};
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public:
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static engine_t* get();
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void add_pass(pass_t* pass);
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void run(decomp::symbol_t* sym);
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private:
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std::vector<pass_t*> passes;
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};
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} // namespace theo::comp::obf
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#pragma once
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#include <spdlog/spdlog.h>
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#include <decomp/symbol.hpp>
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#define XED_ENCODER
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extern "C" {
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#include <xed-decode.h>
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#include <xed-interface.h>
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}
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namespace theo::comp::obf {
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class pass_t {
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public:
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explicit pass_t(decomp::sym_type_t sym_type) : m_sym_type(sym_type){};
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virtual void run(decomp::symbol_t* sym) = 0;
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decomp::sym_type_t sym_type() { return m_sym_type; }
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private:
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decomp::sym_type_t m_sym_type;
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};
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} // namespace theo::comp::obf
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#pragma once
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#include <comp/obf/pass.hpp>
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namespace theo::comp::obf {
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class jcc_rewrite_pass_t : public pass_t {
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explicit jcc_rewrite_pass_t() : pass_t(decomp::sym_type_t::inst_split){};
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public:
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static jcc_rewrite_pass_t* get() {
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static jcc_rewrite_pass_t obj;
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return &obj;
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}
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void run(decomp::symbol_t* sym){};
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};
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} // namespace theo::comp::obf
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#pragma once
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#include <comp/obf/pass.hpp>
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namespace theo::comp::obf {
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class next_inst_pass_t : public pass_t {
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explicit next_inst_pass_t() : pass_t(decomp::sym_type_t::inst_split){};
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public:
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static next_inst_pass_t* get() {
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static next_inst_pass_t obj;
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return &obj;
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}
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void run(decomp::symbol_t* sym){};
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};
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} // namespace theo::comp::obf
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#pragma once
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#include <comp/obf/pass.hpp>
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namespace theo::comp::obf {
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class reloc_transform_pass_t : public pass_t {
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explicit reloc_transform_pass_t() : pass_t(decomp::sym_type_t::inst_split){};
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public:
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static reloc_transform_pass_t* get();
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void run(decomp::symbol_t* sym);
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private:
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bool has_legit_reloc(decomp::symbol_t* sym);
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};
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} // namespace theo::comp::obf
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#pragma once
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#include <comp/obf/transform/operation.hpp>
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namespace theo::comp::obf::transform {
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class add_op_t : operation_t {
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explicit add_op_t()
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: operation_t([&](std::size_t val,
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std::size_t imm) -> std::size_t { return val + imm; },
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type_t::add_op) {}
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public:
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static add_op_t* get();
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std::vector<std::uint8_t> native(xed_inst_t* inst, std::size_t imm);
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};
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} // namespace theo::comp::obf::transform
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#pragma once
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#include <functional>
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#include <map>
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#define XED_ENCODER
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extern "C" {
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#include <xed-decode.h>
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#include <xed-interface.h>
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}
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namespace theo::comp::obf::transform {
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using transform_t = std::function<std::size_t(std::size_t, std::size_t)>;
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class operation_t {
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public:
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enum type_t { add_op, sub_op, and_op, or_op, rol_op, ror_op, xor_op };
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explicit operation_t(transform_t op, type_t type)
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: m_transform(op), m_type(type) {}
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virtual std::vector<std::uint8_t> native(xed_inst_t* inst,
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std::size_t imm) = 0;
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type_t inverse() { return m_inverse_op[m_type]; }
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transform_t get_transform() { return m_transform; }
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private:
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transform_t m_transform;
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type_t m_type;
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std::map<type_t, type_t> m_inverse_op = {
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{add_op, sub_op}, {sub_op, add_op}, {and_op, or_op}, {or_op, and_op},
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{rol_op, ror_op}, {ror_op, rol_op}, {xor_op, xor_op}};
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};
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} // namespace theo::comp::obf::transform
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#pragma once
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#include <comp/obf/transform/add_op.hpp>
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#include <comp/obf/transform/operation.hpp>
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#include <comp/obf/transform/sub_op.hpp>
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namespace theo::comp::obf::transform {
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std::map<operation_t::type_t, operation_t*> operations;
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}
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#include <comp/obf/engine.hpp>
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namespace theo::comp::obf {
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engine_t* engine_t::get() {
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static engine_t obj;
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return &obj;
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}
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void engine_t::add_pass(pass_t* pass) {
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passes.push_back(pass);
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}
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void engine_t::run(decomp::symbol_t* sym) {
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std::for_each(passes.begin(), passes.end(), [&](pass_t* pass) {
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if (sym->type() == pass->sym_type())
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pass->run(sym);
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});
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}
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} // namespace theo::comp::obf
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#include <comp/obf/passes/reloc_transform_pass.hpp>
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namespace theo::comp::obf {
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reloc_transform_pass_t* reloc_transform_pass_t::get() {
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static reloc_transform_pass_t obj;
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return &obj;
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}
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void reloc_transform_pass_t::run(decomp::symbol_t* sym) {
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if (!has_legit_reloc(sym))
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return;
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spdlog::info("adding transformations to relocation in symbol: {}",
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sym->name());
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xed_error_enum_t err;
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xed_decoded_inst_t inst;
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xed_state_t istate{XED_MACHINE_MODE_LONG_64, XED_ADDRESS_WIDTH_64b};
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xed_decoded_inst_zero_set_mode(&inst, &istate);
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if ((err = xed_decode(&inst, sym->data().data(), sym->data().size())) !=
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XED_ERROR_NONE) {
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spdlog::error("failed to decode instruction, reason: {} in symbol: {}",
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xed_error_enum_t2str(err), sym->name());
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assert(err == XED_ERROR_NONE);
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}
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};
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bool reloc_transform_pass_t::has_legit_reloc(decomp::symbol_t* sym) {
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auto res = // see if there are any relocations with offset not equal to
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// zero... relocations with zero mean its a relocation to the next
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// instruction...
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std::find_if(sym->relocs().begin(), sym->relocs().end(),
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[&](reloc_t& reloc) -> bool { return reloc.offset(); });
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return res != sym->relocs().end();
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}
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} // namespace theo::comp::obf
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#include <comp/obf/transform/add_op.hpp>
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namespace theo::comp::obf::transform {
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add_op_t* add_op_t::get() {
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static add_op_t obj;
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return &obj;
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}
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std::vector<std::uint8_t> add_op_t::native(xed_inst_t* inst, std::size_t imm) {
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auto op = xed_inst_operand(inst, 0);
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auto reg = xed_operand_reg(op);
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return {};
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}
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} // namespace theo::comp::obf::transform
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