chore: refactored a lot, made it fancy
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413b2a8730
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7029a048af
GPG key ID:
A4895B84D311642C
3 changed files with 172 additions and 116 deletions
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@ -1,9 +1,10 @@
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mod syscalls;
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mod operations;
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use std::ffi::c_void;
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use nix::{Result, {sys::{ptrace, wait::waitpid}, unistd::Pid}, libc::{PROT_READ, PROT_WRITE, MAP_PRIVATE, MAP_ANON}};
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use nix::{Result, {sys::{ptrace, wait::waitpid}, unistd::Pid}};
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use clap::Parser;
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use syscalls::{prepare_mmap, prepare_write};
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use operations::step_to_syscall;
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use syscalls::{RemoteString, RemoteWrite, RemoteSyscall};
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#[derive(Parser, Debug)]
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#[command(author, version, about, long_about = None)]
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@ -16,97 +17,12 @@ struct NeedleArgs {
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word: u32,
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}
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pub fn send_str(pid: Pid, syscall_addr: u64, data: &str) -> Result<usize> {
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let mut regs = ptrace::getregs(pid)?;
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regs.rip = syscall_addr;
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prepare_mmap(&mut regs, 0, data.len(), PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, 0xFFFFFFFFFFFFFFFF, 0);
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ptrace::setregs(pid, regs)?;
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ptrace::step(pid, None)?;
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waitpid(pid, None)?;
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let zone_addr = ptrace::getregs(pid)?.rax as usize;
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write_buffer(pid, zone_addr, data.as_bytes(), 32)?; // TODO word size!
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Ok(zone_addr)
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}
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pub fn read_buffer(pid: Pid, addr: usize, size: usize, word: u32) -> Result<Vec<u8>> {
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let mut out = vec![];
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for i in (0..size).step_by((word/8) as usize) {
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let data = ptrace::read(pid, (addr + i) as *mut c_void)?;
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for j in 0..(word/8) as usize {
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out.push(((data >> (j * 8)) & 0xFF) as u8);
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}
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}
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Ok(out)
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}
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pub fn write_buffer(pid: Pid, addr: usize, payload: &[u8], word:u32) -> Result<()> {
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let step = word / 8;
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let mut at = addr;
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for chunk in payload.chunks(step as usize) {
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let mut buf : u64 = 0;
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for (i, c) in chunk.iter().enumerate() {
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buf |= (*c as u64) << (i * 8);
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}
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unsafe { ptrace::write(pid, at as *mut c_void, buf as *mut c_void)?; }
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at += step as usize;
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}
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Ok(())
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}
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pub fn pwn(pid: Pid, _word_size: usize) -> Result<()> {
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let mut prev_regs;
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let mut insn_addr;
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let mut curr_instr;
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// seek to syscall
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loop {
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prev_regs = ptrace::getregs(pid)?;
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insn_addr = prev_regs.rip;
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curr_instr = ptrace::read(pid, insn_addr as *mut c_void)?;
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// println!("@ 0x{:X} [{:x}]", insn_addr, curr_instr);
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if curr_instr & 0xFFFF == 0x050F {
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// println!("found syscall!");
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break;
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}
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ptrace::step(pid, None)?;
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waitpid(pid, None)?;
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}
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// // Put syscall opcodes
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// let mut syscall_insn = vec![0x00u8; word_size/8];
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// syscall_insn[0] = 0x05; // it's two!
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// syscall_insn[1] = 0x0F;
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// unsafe {
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// ptrace::write(pid, insn_addr, syscall_insn.as_slice().as_ptr() as *mut c_void)?;
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// }
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let msg = send_str(pid, insn_addr, "injected!\n\0")?;
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let mut call_regs = prev_regs.clone();
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call_regs.rip = insn_addr;
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prepare_write(&mut call_regs, 1, msg, 10);
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ptrace::setregs(pid, call_regs)?;
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ptrace::step(pid, None)?;
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waitpid(pid, None)?;
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// println!("Written payload to stdout on tracee");
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// restore code and registers
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// unsafe {
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// ptrace::write(pid, insn_addr, prev_instr.as_ptr() as *mut c_void)?;
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// }
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ptrace::setregs(pid, prev_regs)?;
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pub fn nasty_stuff(pid: Pid, _word_size: usize) -> Result<()> {
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let original_registers = ptrace::getregs(pid)?;
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let syscall_addr = step_to_syscall(pid)?;
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let msg = RemoteString::new(pid, syscall_addr, "injected!\n\0".into())?;
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RemoteWrite::args(1, msg).syscall(pid, syscall_addr)?;
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ptrace::setregs(pid, original_registers)?;
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Ok(())
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}
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@ -125,7 +41,7 @@ fn main() {
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println!("Attached to process #{}", args.pid);
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if let Err(e) = pwn(pid, args.word as usize) {
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if let Err(e) = nasty_stuff(pid, args.word as usize) {
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eprintln!("Could not pwn : {}", e);
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}
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54
src/needle/operations.rs
Normal file
54
src/needle/operations.rs
Normal file
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@ -0,0 +1,54 @@
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use std::ffi::c_void;
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use nix::{Result, unistd::Pid, sys::{ptrace, wait::waitpid}};
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#[allow(unused)]
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pub fn read_buffer(pid: Pid, addr: usize, size: usize, word: u32) -> Result<Vec<u8>> {
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let mut out = vec![];
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for i in (0..size).step_by((word/8) as usize) {
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let data = ptrace::read(pid, (addr + i) as *mut c_void)?;
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for j in 0..(word/8) as usize {
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out.push(((data >> (j * 8)) & 0xFF) as u8);
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}
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}
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Ok(out)
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}
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pub fn write_buffer(pid: Pid, addr: usize, payload: &[u8], word:u32) -> Result<()> {
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let step = word / 8;
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let mut at = addr;
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for chunk in payload.chunks(step as usize) {
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let mut buf : u64 = 0;
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for (i, c) in chunk.iter().enumerate() {
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buf |= (*c as u64) << (i * 8);
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}
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unsafe { ptrace::write(pid, at as *mut c_void, buf as *mut c_void)?; }
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at += step as usize;
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}
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Ok(())
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}
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pub fn step_to_syscall(pid: Pid) -> Result<usize> {
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let mut registers;
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let mut addr;
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let mut instructions;
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// seek to syscall
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loop {
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registers = ptrace::getregs(pid)?;
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addr = registers.rip as usize;
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instructions = ptrace::read(pid, addr as *mut c_void)?;
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// println!("@ 0x{:X} [{:x}]", insn_addr, curr_instr);
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if instructions & 0xFFFF == 0x050F {
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return Ok(addr);
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}
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ptrace::step(pid, None)?;
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waitpid(pid, None)?;
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}
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}
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@ -1,6 +1,37 @@
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use nix::libc::user_regs_struct;
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use nix::{libc::{user_regs_struct, MAP_PRIVATE, MAP_ANON, PROT_READ, PROT_WRITE}, Result, sys::{ptrace, wait::waitpid}, unistd::Pid};
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fn prepare_for_syscall(regs: &mut user_regs_struct, rax: u64, rdi: u64, rsi: u64, rdx: u64, r10: u64, r8: u64, r9: u64) {
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use crate::operations::write_buffer;
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pub struct RemoteString {
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pub ptr: usize,
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pub txt: String,
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}
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impl RemoteString {
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pub fn new(pid: Pid, syscall: usize, txt: String) -> Result<Self> {
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let ptr = RemoteMMap::args(
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0, txt.len(), PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, 0xFFFFFFFFFFFFFFFF, 0
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).syscall(pid, syscall)? as usize;
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write_buffer(pid, ptr, txt.as_bytes(), 32)?; // TODO don't hardcode word size
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Ok(RemoteString { ptr, txt })
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}
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}
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pub trait RemoteSyscall {
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fn registers(&self, regs: &mut user_regs_struct);
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fn syscall(&self, pid: Pid, addr: usize) -> Result<u64> {
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let mut regs = ptrace::getregs(pid)?;
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regs.rip = addr as u64;
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self.registers(&mut regs);
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ptrace::setregs(pid, regs)?;
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ptrace::step(pid, None)?;
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waitpid(pid, None)?;
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regs = ptrace::getregs(pid)?;
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Ok(regs.rax)
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}
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fn prepare_registers(regs: &mut user_regs_struct, rax: u64, rdi: u64, rsi: u64, rdx: u64, r10: u64, r8: u64, r9: u64) {
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regs.rax = rax;
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regs.rdi = rdi;
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regs.rsi = rsi;
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@ -8,24 +39,79 @@ fn prepare_for_syscall(regs: &mut user_regs_struct, rax: u64, rdi: u64, rsi: u64
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regs.r10 = r10;
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regs.r8 = r8;
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regs.r9 = r9;
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}
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}
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pub struct RemoteMMap {
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addr: u64,
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len: usize,
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prot: i32,
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flags: i32,
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fd: u64,
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off: u64,
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}
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impl RemoteMMap {
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pub fn args(addr: u64, len: usize, prot: i32, flags: i32, fd: u64, off: u64) -> Self {
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RemoteMMap { addr, len, prot, flags, fd, off }
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}
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}
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impl RemoteSyscall for RemoteMMap {
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fn registers(&self, regs: &mut user_regs_struct) {
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Self::prepare_registers(regs, 9, self.addr, self.len as u64, self.prot as u64, self.flags as u64, self.fd, self.off);
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}
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}
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pub struct RemoteOpen {
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filename: RemoteString,
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flags: u64,
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mode: u64,
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}
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#[allow(unused)]
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pub fn prepare_mmap(regs: &mut user_regs_struct, addr: u64, len: usize, prot: i32, flags: i32, fd: u64, off: u64) {
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prepare_for_syscall(regs, 9, addr, len as u64, prot as u64, flags as u64, fd, off);
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impl RemoteOpen {
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pub fn args(filename: RemoteString, flags: u64, mode: u64) -> Self {
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RemoteOpen { filename, flags, mode }
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}
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}
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impl RemoteSyscall for RemoteOpen {
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fn registers(&self, regs: &mut user_regs_struct) {
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Self::prepare_registers(regs, 2, self.filename.ptr as u64, self.flags, self.mode, 0, 0, 0);
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}
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}
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pub struct RemoteWrite {
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fd: u64,
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buf: RemoteString, // TODO make remote slice or remote bytes
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}
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impl RemoteWrite {
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pub fn args(fd: u64, buf: RemoteString) -> Self {
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RemoteWrite { fd, buf }
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}
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}
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impl RemoteSyscall for RemoteWrite {
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fn registers(&self, regs: &mut user_regs_struct) {
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Self::prepare_registers(regs, 1, self.fd, self.buf.ptr as u64, self.buf.txt.len() as u64, 0, 0, 0);
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}
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}
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pub struct RemoteExit {
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code: i64,
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}
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#[allow(unused)]
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pub fn prepare_open(regs: &mut user_regs_struct, filename: &str, flags: u64, mode: u64) {
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prepare_for_syscall(regs, 2, filename.as_ptr() as u64, flags, mode, 0, 0, 0);
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impl RemoteExit {
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pub fn args(code: i64) -> Self {
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RemoteExit { code }
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}
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}
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#[allow(unused)]
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pub fn prepare_write(regs: &mut user_regs_struct, fd: u64, buf: usize, count: usize) {
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prepare_for_syscall(regs, 1, fd, buf as u64, count as u64, 0, 0, 0);
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}
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#[allow(unused)]
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pub fn prepare_exit(regs: &mut user_regs_struct, error_code: i64) {
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prepare_for_syscall(regs, 60, error_code as u64, 0, 0, 0, 0, 0);
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impl RemoteSyscall for RemoteExit {
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fn registers(&self, regs: &mut user_regs_struct) {
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Self::prepare_registers(regs, 60, self.code as u64, 0, 0, 0, 0, 0);
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}
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}
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