549 lines
17 KiB
C++
549 lines
17 KiB
C++
/*************************************************************************/
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/* macho.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "modules/modules_enabled.gen.h" // For regex.
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#include "macho.h"
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#ifdef MODULE_REGEX_ENABLED
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uint32_t MachO::seg_align(uint64_t p_vmaddr, uint32_t p_min, uint32_t p_max) {
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uint32_t align = p_max;
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if (p_vmaddr != 0) {
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uint64_t seg_align = 1;
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align = 0;
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while ((seg_align & p_vmaddr) == 0) {
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seg_align = seg_align << 1;
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align++;
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}
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align = CLAMP(align, p_min, p_max);
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}
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return align;
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}
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bool MachO::alloc_signature(uint64_t p_size) {
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ERR_FAIL_COND_V_MSG(fa.is_null(), false, "MachO: File not opened.");
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if (signature_offset != 0) {
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// Nothing to do, already have signature load command.
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return true;
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}
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if (lc_limit == 0 || lc_limit + 16 > exe_base) {
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ERR_FAIL_V_MSG(false, "MachO: Can't allocate signature load command, please use \"codesign_allocate\" utility first.");
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} else {
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// Add signature load command.
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signature_offset = lc_limit;
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fa->seek(lc_limit);
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LoadCommandHeader lc;
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lc.cmd = LC_CODE_SIGNATURE;
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lc.cmdsize = 16;
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if (swap) {
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lc.cmdsize = BSWAP32(lc.cmdsize);
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}
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fa->store_buffer((const uint8_t *)&lc, sizeof(LoadCommandHeader));
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uint32_t lc_offset = fa->get_length() + PAD(fa->get_length(), 16);
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uint32_t lc_size = 0;
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if (swap) {
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lc_offset = BSWAP32(lc_offset);
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lc_size = BSWAP32(lc_size);
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}
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fa->store_32(lc_offset);
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fa->store_32(lc_size);
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// Write new command number.
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fa->seek(0x10);
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uint32_t ncmds = fa->get_32();
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uint32_t cmdssize = fa->get_32();
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if (swap) {
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ncmds = BSWAP32(ncmds);
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cmdssize = BSWAP32(cmdssize);
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}
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ncmds += 1;
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cmdssize += 16;
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if (swap) {
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ncmds = BSWAP32(ncmds);
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cmdssize = BSWAP32(cmdssize);
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}
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fa->seek(0x10);
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fa->store_32(ncmds);
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fa->store_32(cmdssize);
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lc_limit = lc_limit + sizeof(LoadCommandHeader) + 8;
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return true;
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}
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}
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bool MachO::is_macho(const String &p_path) {
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Ref<FileAccess> fb = FileAccess::open(p_path, FileAccess::READ);
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ERR_FAIL_COND_V_MSG(fb.is_null(), false, vformat("MachO: Can't open file: \"%s\".", p_path));
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uint32_t magic = fb->get_32();
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return (magic == 0xcefaedfe || magic == 0xfeedface || magic == 0xcffaedfe || magic == 0xfeedfacf);
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}
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bool MachO::open_file(const String &p_path) {
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fa = FileAccess::open(p_path, FileAccess::READ_WRITE);
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ERR_FAIL_COND_V_MSG(fa.is_null(), false, vformat("MachO: Can't open file: \"%s\".", p_path));
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uint32_t magic = fa->get_32();
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MachHeader mach_header;
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// Read MachO header.
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swap = (magic == 0xcffaedfe || magic == 0xcefaedfe);
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if (magic == 0xcefaedfe || magic == 0xfeedface) {
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// Thin 32-bit binary.
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fa->get_buffer((uint8_t *)&mach_header, sizeof(MachHeader));
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} else if (magic == 0xcffaedfe || magic == 0xfeedfacf) {
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// Thin 64-bit binary.
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fa->get_buffer((uint8_t *)&mach_header, sizeof(MachHeader));
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fa->get_32(); // Skip extra reserved field.
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} else {
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ERR_FAIL_V_MSG(false, vformat("MachO: File is not a valid MachO binary: \"%s\".", p_path));
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}
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if (swap) {
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mach_header.ncmds = BSWAP32(mach_header.ncmds);
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mach_header.cpusubtype = BSWAP32(mach_header.cpusubtype);
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mach_header.cputype = BSWAP32(mach_header.cputype);
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}
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cpusubtype = mach_header.cpusubtype;
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cputype = mach_header.cputype;
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align = 0;
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exe_base = std::numeric_limits<uint64_t>::max();
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exe_limit = 0;
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lc_limit = 0;
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link_edit_offset = 0;
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signature_offset = 0;
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// Read load commands.
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for (uint32_t i = 0; i < mach_header.ncmds; i++) {
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LoadCommandHeader lc;
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fa->get_buffer((uint8_t *)&lc, sizeof(LoadCommandHeader));
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if (swap) {
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lc.cmd = BSWAP32(lc.cmd);
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lc.cmdsize = BSWAP32(lc.cmdsize);
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}
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uint64_t ps = fa->get_position();
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switch (lc.cmd) {
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case LC_SEGMENT: {
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LoadCommandSegment lc_seg;
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fa->get_buffer((uint8_t *)&lc_seg, sizeof(LoadCommandSegment));
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if (swap) {
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lc_seg.nsects = BSWAP32(lc_seg.nsects);
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lc_seg.vmaddr = BSWAP32(lc_seg.vmaddr);
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lc_seg.vmsize = BSWAP32(lc_seg.vmsize);
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}
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align = MAX(align, seg_align(lc_seg.vmaddr, 2, 15));
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if (String(lc_seg.segname) == "__TEXT") {
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exe_limit = MAX(exe_limit, lc_seg.vmsize);
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for (uint32_t j = 0; j < lc_seg.nsects; j++) {
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Section lc_sect;
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fa->get_buffer((uint8_t *)&lc_sect, sizeof(Section));
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if (String(lc_sect.sectname) == "__text") {
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if (swap) {
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exe_base = MIN(exe_base, BSWAP32(lc_sect.offset));
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} else {
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exe_base = MIN(exe_base, lc_sect.offset);
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}
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}
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if (swap) {
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align = MAX(align, BSWAP32(lc_sect.align));
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} else {
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align = MAX(align, lc_sect.align);
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}
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}
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} else if (String(lc_seg.segname) == "__LINKEDIT") {
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link_edit_offset = ps - 8;
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}
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} break;
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case LC_SEGMENT_64: {
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LoadCommandSegment64 lc_seg;
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fa->get_buffer((uint8_t *)&lc_seg, sizeof(LoadCommandSegment64));
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if (swap) {
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lc_seg.nsects = BSWAP32(lc_seg.nsects);
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lc_seg.vmaddr = BSWAP64(lc_seg.vmaddr);
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lc_seg.vmsize = BSWAP64(lc_seg.vmsize);
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}
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align = MAX(align, seg_align(lc_seg.vmaddr, 3, 15));
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if (String(lc_seg.segname) == "__TEXT") {
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exe_limit = MAX(exe_limit, lc_seg.vmsize);
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for (uint32_t j = 0; j < lc_seg.nsects; j++) {
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Section64 lc_sect;
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fa->get_buffer((uint8_t *)&lc_sect, sizeof(Section64));
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if (String(lc_sect.sectname) == "__text") {
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if (swap) {
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exe_base = MIN(exe_base, BSWAP32(lc_sect.offset));
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} else {
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exe_base = MIN(exe_base, lc_sect.offset);
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}
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if (swap) {
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align = MAX(align, BSWAP32(lc_sect.align));
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} else {
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align = MAX(align, lc_sect.align);
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}
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}
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}
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} else if (String(lc_seg.segname) == "__LINKEDIT") {
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link_edit_offset = ps - 8;
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}
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} break;
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case LC_CODE_SIGNATURE: {
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signature_offset = ps - 8;
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} break;
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default: {
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} break;
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}
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fa->seek(ps + lc.cmdsize - 8);
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lc_limit = ps + lc.cmdsize - 8;
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}
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if (exe_limit == 0 || lc_limit == 0) {
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ERR_FAIL_V_MSG(false, vformat("MachO: No load commands or executable code found: \"%s\".", p_path));
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}
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return true;
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}
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uint64_t MachO::get_exe_base() {
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ERR_FAIL_COND_V_MSG(fa.is_null(), 0, "MachO: File not opened.");
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return exe_base;
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}
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uint64_t MachO::get_exe_limit() {
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ERR_FAIL_COND_V_MSG(fa.is_null(), 0, "MachO: File not opened.");
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return exe_limit;
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}
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int32_t MachO::get_align() {
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ERR_FAIL_COND_V_MSG(fa.is_null(), 0, "MachO: File not opened.");
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return align;
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}
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uint32_t MachO::get_cputype() {
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ERR_FAIL_COND_V_MSG(fa.is_null(), 0, "MachO: File not opened.");
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return cputype;
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}
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uint32_t MachO::get_cpusubtype() {
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ERR_FAIL_COND_V_MSG(fa.is_null(), 0, "MachO: File not opened.");
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return cpusubtype;
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}
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uint64_t MachO::get_size() {
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ERR_FAIL_COND_V_MSG(fa.is_null(), 0, "MachO: File not opened.");
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return fa->get_length();
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}
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uint64_t MachO::get_signature_offset() {
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ERR_FAIL_COND_V_MSG(fa.is_null(), 0, "MachO: File not opened.");
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ERR_FAIL_COND_V_MSG(signature_offset == 0, 0, "MachO: No signature load command.");
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fa->seek(signature_offset + 8);
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if (swap) {
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return BSWAP32(fa->get_32());
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} else {
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return fa->get_32();
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}
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}
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uint64_t MachO::get_code_limit() {
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ERR_FAIL_COND_V_MSG(fa.is_null(), 0, "MachO: File not opened.");
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if (signature_offset == 0) {
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return fa->get_length() + PAD(fa->get_length(), 16);
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} else {
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return get_signature_offset();
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}
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}
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uint64_t MachO::get_signature_size() {
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ERR_FAIL_COND_V_MSG(fa.is_null(), 0, "MachO: File not opened.");
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ERR_FAIL_COND_V_MSG(signature_offset == 0, 0, "MachO: No signature load command.");
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fa->seek(signature_offset + 12);
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if (swap) {
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return BSWAP32(fa->get_32());
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} else {
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return fa->get_32();
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}
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}
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bool MachO::is_signed() {
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ERR_FAIL_COND_V_MSG(fa.is_null(), false, "MachO: File not opened.");
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if (signature_offset == 0) {
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return false;
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}
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fa->seek(get_signature_offset());
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uint32_t magic = BSWAP32(fa->get_32());
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if (magic != 0xfade0cc0) {
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return false; // No SuperBlob found.
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}
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fa->get_32(); // Skip size field, unused.
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uint32_t count = BSWAP32(fa->get_32());
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for (uint32_t i = 0; i < count; i++) {
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uint32_t index_type = BSWAP32(fa->get_32());
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uint32_t offset = BSWAP32(fa->get_32());
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if (index_type == 0x00000000) { // CodeDirectory index type.
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fa->seek(get_signature_offset() + offset + 12);
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uint32_t flags = BSWAP32(fa->get_32());
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if (flags & 0x20000) {
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return false; // Found CD, linker-signed.
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} else {
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return true; // Found CD, not linker-signed.
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}
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}
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}
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return false; // No CD found.
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}
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PackedByteArray MachO::get_cdhash_sha1() {
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ERR_FAIL_COND_V_MSG(fa.is_null(), PackedByteArray(), "MachO: File not opened.");
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if (signature_offset == 0) {
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return PackedByteArray();
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}
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fa->seek(get_signature_offset());
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uint32_t magic = BSWAP32(fa->get_32());
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if (magic != 0xfade0cc0) {
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return PackedByteArray(); // No SuperBlob found.
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}
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fa->get_32(); // Skip size field, unused.
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uint32_t count = BSWAP32(fa->get_32());
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for (uint32_t i = 0; i < count; i++) {
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fa->get_32(); // Index type, skip.
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uint32_t offset = BSWAP32(fa->get_32());
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uint64_t pos = fa->get_position();
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fa->seek(get_signature_offset() + offset);
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uint32_t cdmagic = BSWAP32(fa->get_32());
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uint32_t cdsize = BSWAP32(fa->get_32());
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if (cdmagic == 0xfade0c02) { // CodeDirectory.
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fa->seek(get_signature_offset() + offset + 36);
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uint8_t hash_size = fa->get_8();
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uint8_t hash_type = fa->get_8();
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if (hash_size == 0x14 && hash_type == 0x01) { /* SHA-1 */
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PackedByteArray hash;
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hash.resize(0x14);
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fa->seek(get_signature_offset() + offset);
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PackedByteArray blob;
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blob.resize(cdsize);
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fa->get_buffer(blob.ptrw(), cdsize);
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CryptoCore::SHA1Context ctx;
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ctx.start();
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ctx.update(blob.ptr(), blob.size());
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ctx.finish(hash.ptrw());
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return hash;
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}
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}
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fa->seek(pos);
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}
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return PackedByteArray();
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}
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PackedByteArray MachO::get_cdhash_sha256() {
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ERR_FAIL_COND_V_MSG(fa.is_null(), PackedByteArray(), "MachO: File not opened.");
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if (signature_offset == 0) {
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return PackedByteArray();
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}
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fa->seek(get_signature_offset());
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uint32_t magic = BSWAP32(fa->get_32());
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if (magic != 0xfade0cc0) {
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return PackedByteArray(); // No SuperBlob found.
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}
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fa->get_32(); // Skip size field, unused.
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uint32_t count = BSWAP32(fa->get_32());
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for (uint32_t i = 0; i < count; i++) {
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fa->get_32(); // Index type, skip.
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uint32_t offset = BSWAP32(fa->get_32());
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uint64_t pos = fa->get_position();
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fa->seek(get_signature_offset() + offset);
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uint32_t cdmagic = BSWAP32(fa->get_32());
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uint32_t cdsize = BSWAP32(fa->get_32());
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if (cdmagic == 0xfade0c02) { // CodeDirectory.
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fa->seek(get_signature_offset() + offset + 36);
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uint8_t hash_size = fa->get_8();
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uint8_t hash_type = fa->get_8();
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if (hash_size == 0x20 && hash_type == 0x02) { /* SHA-256 */
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PackedByteArray hash;
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hash.resize(0x20);
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fa->seek(get_signature_offset() + offset);
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PackedByteArray blob;
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blob.resize(cdsize);
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fa->get_buffer(blob.ptrw(), cdsize);
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CryptoCore::SHA256Context ctx;
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ctx.start();
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ctx.update(blob.ptr(), blob.size());
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ctx.finish(hash.ptrw());
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return hash;
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}
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}
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fa->seek(pos);
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}
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return PackedByteArray();
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}
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PackedByteArray MachO::get_requirements() {
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ERR_FAIL_COND_V_MSG(fa.is_null(), PackedByteArray(), "MachO: File not opened.");
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if (signature_offset == 0) {
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return PackedByteArray();
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}
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fa->seek(get_signature_offset());
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uint32_t magic = BSWAP32(fa->get_32());
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if (magic != 0xfade0cc0) {
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return PackedByteArray(); // No SuperBlob found.
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}
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fa->get_32(); // Skip size field, unused.
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uint32_t count = BSWAP32(fa->get_32());
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for (uint32_t i = 0; i < count; i++) {
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fa->get_32(); // Index type, skip.
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uint32_t offset = BSWAP32(fa->get_32());
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uint64_t pos = fa->get_position();
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fa->seek(get_signature_offset() + offset);
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uint32_t rqmagic = BSWAP32(fa->get_32());
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uint32_t rqsize = BSWAP32(fa->get_32());
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if (rqmagic == 0xfade0c01) { // Requirements.
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PackedByteArray blob;
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fa->seek(get_signature_offset() + offset);
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blob.resize(rqsize);
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fa->get_buffer(blob.ptrw(), rqsize);
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return blob;
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}
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fa->seek(pos);
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}
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return PackedByteArray();
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}
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const Ref<FileAccess> MachO::get_file() const {
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return fa;
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}
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Ref<FileAccess> MachO::get_file() {
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return fa;
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}
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bool MachO::set_signature_size(uint64_t p_size) {
|
|
ERR_FAIL_COND_V_MSG(fa.is_null(), false, "MachO: File not opened.");
|
|
|
|
// Ensure signature load command exists.
|
|
ERR_FAIL_COND_V_MSG(link_edit_offset == 0, false, "MachO: No __LINKEDIT segment found.");
|
|
ERR_FAIL_COND_V_MSG(!alloc_signature(p_size), false, "MachO: Can't allocate signature load command.");
|
|
|
|
// Update signature load command.
|
|
uint64_t old_size = get_signature_size();
|
|
uint64_t new_size = p_size + PAD(p_size, 16384);
|
|
|
|
if (new_size <= old_size) {
|
|
fa->seek(get_signature_offset());
|
|
for (uint64_t i = 0; i < old_size; i++) {
|
|
fa->store_8(0x00);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
fa->seek(signature_offset + 12);
|
|
if (swap) {
|
|
fa->store_32(BSWAP32(new_size));
|
|
} else {
|
|
fa->store_32(new_size);
|
|
}
|
|
|
|
uint64_t end = get_signature_offset() + new_size;
|
|
|
|
// Update "__LINKEDIT" segment.
|
|
LoadCommandHeader lc;
|
|
fa->seek(link_edit_offset);
|
|
fa->get_buffer((uint8_t *)&lc, sizeof(LoadCommandHeader));
|
|
if (swap) {
|
|
lc.cmd = BSWAP32(lc.cmd);
|
|
lc.cmdsize = BSWAP32(lc.cmdsize);
|
|
}
|
|
switch (lc.cmd) {
|
|
case LC_SEGMENT: {
|
|
LoadCommandSegment lc_seg;
|
|
fa->get_buffer((uint8_t *)&lc_seg, sizeof(LoadCommandSegment));
|
|
if (swap) {
|
|
lc_seg.vmsize = BSWAP32(lc_seg.vmsize);
|
|
lc_seg.filesize = BSWAP32(lc_seg.filesize);
|
|
lc_seg.fileoff = BSWAP32(lc_seg.fileoff);
|
|
}
|
|
|
|
lc_seg.vmsize = end - lc_seg.fileoff;
|
|
lc_seg.vmsize += PAD(lc_seg.vmsize, 4096);
|
|
lc_seg.filesize = end - lc_seg.fileoff;
|
|
|
|
if (swap) {
|
|
lc_seg.vmsize = BSWAP32(lc_seg.vmsize);
|
|
lc_seg.filesize = BSWAP32(lc_seg.filesize);
|
|
}
|
|
fa->seek(link_edit_offset + 8);
|
|
fa->store_buffer((const uint8_t *)&lc_seg, sizeof(LoadCommandSegment));
|
|
} break;
|
|
case LC_SEGMENT_64: {
|
|
LoadCommandSegment64 lc_seg;
|
|
fa->get_buffer((uint8_t *)&lc_seg, sizeof(LoadCommandSegment64));
|
|
if (swap) {
|
|
lc_seg.vmsize = BSWAP64(lc_seg.vmsize);
|
|
lc_seg.filesize = BSWAP64(lc_seg.filesize);
|
|
lc_seg.fileoff = BSWAP64(lc_seg.fileoff);
|
|
}
|
|
lc_seg.vmsize = end - lc_seg.fileoff;
|
|
lc_seg.vmsize += PAD(lc_seg.vmsize, 4096);
|
|
lc_seg.filesize = end - lc_seg.fileoff;
|
|
if (swap) {
|
|
lc_seg.vmsize = BSWAP64(lc_seg.vmsize);
|
|
lc_seg.filesize = BSWAP64(lc_seg.filesize);
|
|
}
|
|
fa->seek(link_edit_offset + 8);
|
|
fa->store_buffer((const uint8_t *)&lc_seg, sizeof(LoadCommandSegment64));
|
|
} break;
|
|
default: {
|
|
ERR_FAIL_V_MSG(false, "MachO: Invalid __LINKEDIT segment type.");
|
|
} break;
|
|
}
|
|
fa->seek(get_signature_offset());
|
|
for (uint64_t i = 0; i < new_size; i++) {
|
|
fa->store_8(0x00);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
#endif // MODULE_REGEX_ENABLED
|