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d95794ec8a
As many open source projects have started doing it, we're removing the current year from the copyright notice, so that we don't need to bump it every year. It seems like only the first year of publication is technically relevant for copyright notices, and even that seems to be something that many companies stopped listing altogether (in a version controlled codebase, the commits are a much better source of date of publication than a hardcoded copyright statement). We also now list Godot Engine contributors first as we're collectively the current maintainers of the project, and we clarify that the "exclusive" copyright of the co-founders covers the timespan before opensourcing (their further contributions are included as part of Godot Engine contributors). Also fixed "cf." Frenchism - it's meant as "refer to / see".
543 lines
16 KiB
C++
543 lines
16 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) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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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 "macho.h"
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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 salign = p_max;
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if (p_vmaddr != 0) {
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uint64_t seg_align = 1;
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salign = 0;
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while ((seg_align & p_vmaddr) == 0) {
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seg_align = seg_align << 1;
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salign++;
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}
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salign = CLAMP(salign, p_min, p_max);
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}
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return salign;
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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);
|
|
}
|
|
return PackedByteArray();
|
|
}
|
|
|
|
const Ref<FileAccess> MachO::get_file() const {
|
|
return fa;
|
|
}
|
|
|
|
Ref<FileAccess> MachO::get_file() {
|
|
return fa;
|
|
}
|
|
|
|
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;
|
|
}
|