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"winapi", -] - -[[package]] -name = "winapi-x86_64-pc-windows-gnu" -version = "0.4.0" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f" diff --git a/Cargo.toml b/Cargo.toml index 7b79a78..c0de952 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -1,16 +1,16 @@ [package] name = "plt-rs" -version = "0.1.0" +version = "0.2.0" edition = "2021" authors = ["ohchase"] license = "MIT" -description = "Library for iterating and hooking linux and android applications PLT (Procedure Linkage Table) at runtime" +description = "Library for inspecting, analyzing, and instrumenting linux and android applications runtime symbol linkage" documentation = "https://docs.rs/plt-rs" readme = "README.md" repository = "https://github.com/ohchase/plt-rs/" homepage = "https://github.com/ohchase/plt-rs/" keywords = ["hacking", "linux", "android", "reversing", "plt", "elf", "bionic", "linkmap"] -exclude = ["/examples", "/templates"] +exclude = ["/examples"] [lib] crate-type = ["lib"] @@ -18,6 +18,8 @@ crate-type = ["lib"] # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html [dependencies] -libc = "0.2.137" -thiserror = "1.0.40" -proc-maps = "0.3.0" +libc = "0.2.149" +thiserror = "1.0.49" + +[dev-dependencies] +anyhow = "1.0.75" diff --git a/README.md b/README.md index e425362..8f74122 100644 --- a/README.md +++ b/README.md @@ -1,7 +1,13 @@ # PLT-RS -Get in losers we are hooking the procedural linkage tables -## Derivatives +## Change Notes +### 0.1.0 initial release +### 0.2.0 total revamp +- removed hooking functionality +- reduced linux/android bloat +- documented and generally made more ergonomic + +## Inspirations / Sources utilized Projects I referenced while working on this. - [Plthook by Kubo] https://github.com/kubo/plthook - [Bhook by bytedance] https://github.com/bytedance/bhook @@ -23,7 +29,7 @@ Video game modding, reverse engineering, etc - Can hook networking calls: recv / send - Rendering calls: eglSwapBuffers / video game overlays -## Look at all these ~~chickens~~ targets +## Supports and tests against many targets - ![i686-unknown-linux-gnu](https://github.com/ohchase/plt-rs/actions/workflows/i686-unknown-linux-gnu.yml/badge.svg) - ![x86_64-unknown-linux-gnu](https://github.com/ohchase/plt-rs/actions/workflows/x86_64-unknown-linux-gnu.yml/badge.svg) - ![aarch64-unknown-linux-gnu](https://github.com/ohchase/plt-rs/actions/workflows/aarch64-unknown-linux-gnu.yml/badge.svg) @@ -35,45 +41,118 @@ Video game modding, reverse engineering, etc - ![armv7-linux-androideabi](https://github.com/ohchase/plt-rs/actions/workflows/armv7-linux-androideabi.yml/badge.svg) ## Show me da code -Here we are hooking our own executables usages of libc puts +Here we are hooking our own executables usages of libc getpid. +Refer to `examples/hook_getpid.rs` for the full example, supporting android and 32 bit. +A good chunk of the code is for the actual pointer replacement to hook the function! ```rust -#[inline(never)] -unsafe fn puts_hooked(_input: *const libc::c_char) -> libc::c_int { - let c_str: &std::ffi::CStr = unsafe { std::ffi::CStr::from_ptr(_input) }; - let str_slice: &str = c_str.to_str().unwrap(); - println!("Puts C was hooked. Intercepted: {:#?}", str_slice); - 0 -} -fn get_mut_map<'a>() -> plt::MutableLinkMap<'a> { - use plt::LinkMapBacked; - let link_map = - plt::LinkMapView::from_address(main as *mut libc::c_void as usize).expect("open link map"); - plt::MutableLinkMap::from_view(link_map) +/// our own get pid function +unsafe fn getpid() -> u32 { + 999 } -fn main() -> Result<(), Box> { - let mut mutable_link_map = get_mut_map(); - let _previous_function = mutable_link_map - .hook:: libc::c_int>("puts", puts_hooked as *const _)? - .unwrap(); - unsafe { libc::puts(String::from("Hello\0").as_ptr() as *const _) }; - Ok(()) +/// Finding target function differs on 32 bit and 64 bit. +/// On 64 bit we want to check the addended relocations table only, opposed to the addendless relocations table. +/// Additionally, we will fall back to the plt given it is an addended relocation table. +#[cfg(target_pointer_width = "64")] +fn try_find_function<'a>( + dyn_lib: &'a DynamicLibrary, + dyn_symbols: &'a DynamicSymbols, +) -> Option<&'a plt_rs::elf64::DynRela> { + let string_table = dyn_lib.string_table(); + if let Some(dyn_relas) = dyn_lib.addend_relocs() { + let dyn_relas = dyn_relas.entries().iter(); + if let Some(symbol) = dyn_relas + .flat_map(|e| { + dyn_symbols + .resolve_name(e.symbol_index() as usize, string_table) + .map(|s| (e, s)) + }) + .filter(|(_, s)| s.eq("getpid")) + .next() + .map(|(target_function, _)| target_function) + { + return Some(symbol); + } + } + + if let Some(dyn_relas) = dyn_lib.plt_rela() { + let dyn_relas = dyn_relas.entries().iter(); + if let Some(symbol) = dyn_relas + .flat_map(|e| { + dyn_symbols + .resolve_name(e.symbol_index() as usize, string_table) + .map(|s| (e, s)) + }) + .filter(|(_, s)| s.eq("getpid")) + .next() + .map(|(target_function, _)| target_function) + { + return Some(symbol); + } + } + return None; } -``` -Below you can see it works on both debug and release build. +fn main() -> Result<()> { + let my_pid = unsafe { libc::getpid() }; + println!("application pid is {my_pid}"); + + let executable_entry = find_executable().ok_or(anyhow!("unable to find target executable"))?; + println!("successfully identified executable"); + + let dyn_lib = DynamicLibrary::initialize(executable_entry)?; + println!("successfully initialied dynamic library for instrumentation"); + + let dyn_symbols = dyn_lib + .symbols() + .ok_or(anyhow!("dynamic lib should have symbols"))?; + let target_function = + try_find_function(&dyn_lib, &dyn_symbols).ok_or(anyhow!("unable to find getpid symbol"))?; + println!( + "successfully identified libc getpid offset: {:#X?}", + target_function.r_offset + ); + let base_addr = dyn_lib.library().addr(); + let plt_fn_ptr = (base_addr + target_function.r_offset as usize) as *mut *mut c_void; + let page_size = unsafe { libc::sysconf(libc::_SC_PAGE_SIZE) as usize }; + let plt_page = ((plt_fn_ptr as usize / page_size) * page_size) as *mut c_void; + println!("page start for function is {plt_page:#X?}"); -```shell - Finished dev [unoptimized + debuginfo] target(s) in 0.32s - Running `target/debug/examples/libc_puts` -Puts C was hooked. Intercepted: "Hello" + let _stored_address = unsafe { + // Set the memory page to read, write + let prot_res = libc::mprotect(plt_page, page_size, libc::PROT_WRITE | libc::PROT_READ); + if prot_res != 0 { + println!("protection res: {prot_res}"); + return Err(anyhow!("mprotect to rw")); + } + + // Replace the function address + let previous_address = std::ptr::replace(plt_fn_ptr, getpid as *mut _); + + // Set the memory page protection back to read only + let prot_res = libc::mprotect(plt_page, page_size, libc::PROT_READ); + if prot_res != 0 { + return Err(anyhow!("mprotect to r")); + } + + previous_address as *const c_void + }; + + let get_pid = unsafe { libc::getpid() }; + println!("new pid is: {get_pid}"); + + Ok(()) +} ``` -```shell - Finished release [optimized] target(s) in 8.09s - Running `target/release/examples/libc_puts` -Puts C was hooked. Intercepted: "Hello" +```terminal +application pid is 127765 +successfully identified executable +successfully initialied dynamic library for instrumentation +successfully identified libc getpid offset: 0x7E460 +page start for function is 0x000061019c41b000 +new pid is: 999 ``` diff --git a/examples/dump_plt.rs b/examples/dump_plt.rs new file mode 100644 index 0000000..1fbb6f7 --- /dev/null +++ b/examples/dump_plt.rs @@ -0,0 +1,72 @@ +use anyhow::Result; +use plt_rs::{collect_modules, DynamicLibrary, RelocationTable}; + +fn main() -> Result<()> { + let entries = collect_modules(); + + for entry in entries.into_iter() { + println!("[{:?}] Addr: {:#X?}", entry.name(), entry.addr()); + if let Ok(dynamic_lib) = DynamicLibrary::initialize(entry) { + println!( + "Dynamic String Table Length: {}", + dynamic_lib.string_table().total_size() + ); + + let dynamic_symbols = dynamic_lib.symbols().expect("symbols..."); + let string_table = dynamic_lib.string_table(); + + println!("dynamic addend relocations:"); + if let Some(dyn_relas) = dynamic_lib.addend_relocs() { + dyn_relas + .entries() + .iter() + .flat_map(|e| { + dynamic_symbols.resolve_name(e.symbol_index() as usize, string_table) + }) + .filter(|s| !s.is_empty()) + .for_each(|s| println!("\t{}", s)); + } + + println!("dynamic relocations:"); + if let Some(dyn_relocs) = dynamic_lib.relocs() { + dyn_relocs + .entries() + .iter() + .flat_map(|e| { + dynamic_symbols.resolve_name(e.symbol_index() as usize, string_table) + }) + .filter(|s| !s.is_empty()) + .for_each(|s| println!("\t{}", s)); + } + + println!("plt:"); + if let Some(plt) = dynamic_lib.plt() { + match plt { + RelocationTable::WithAddend(rel) => { + rel.entries() + .iter() + .flat_map(|e| { + dynamic_symbols + .resolve_name(e.symbol_index() as usize, string_table) + }) + .filter(|s| !s.is_empty()) + .for_each(|s| println!("\t{}", s)); + } + RelocationTable::WithoutAddend(rel) => { + rel.entries() + .iter() + .flat_map(|e| { + dynamic_symbols + .resolve_name(e.symbol_index() as usize, string_table) + }) + .filter(|s| !s.is_empty()) + .for_each(|s| println!("\t{}", s)); + } + } + } + } + println!(); + } + + Ok(()) +} diff --git a/examples/hook_getpid.rs b/examples/hook_getpid.rs new file mode 100644 index 0000000..76d1186 --- /dev/null +++ b/examples/hook_getpid.rs @@ -0,0 +1,163 @@ +use anyhow::anyhow; +use anyhow::Result; +use libc::c_void; +use plt_rs::{collect_modules, DynamicLibrary, DynamicSymbols}; + +unsafe fn getpid() -> u32 { + 999 +} + +/// Finding executable target differs on unix and android +#[cfg(target_os = "linux")] +fn find_executable<'a>() -> Option> { + let loaded_modules = collect_modules(); + loaded_modules.into_iter().next() +} + +/// Finding executable target differs on unix and android +#[cfg(target_os = "android")] +fn find_executable<'a>() -> Option> { + let loaded_modules = collect_modules(); + loaded_modules + .into_iter() + .filter(|lib| lib.name().contains("hook_getpid")) + .next() +} + +/// Finding target function differs on 32 bit and 64 bit. +/// On 32 bit we want to check the relocations table only, opposed to the addend relocations table. +/// Additionally, we will fall back to the plt given it is an addendless relocation table. +#[cfg(target_pointer_width = "32")] +fn try_find_function<'a>( + dyn_lib: &'a DynamicLibrary, + dyn_symbols: &'a DynamicSymbols, +) -> Option<&'a plt_rs::elf32::DynRel> { + let string_table = dyn_lib.string_table(); + if let Some(dyn_relas) = dyn_lib.relocs() { + let dyn_relas = dyn_relas.entries().iter(); + if let Some(symbol) = dyn_relas + .flat_map(|e| { + dyn_symbols + .resolve_name(e.symbol_index() as usize, string_table) + .map(|s| (e, s)) + }) + .filter(|(_, s)| s.eq("getpid")) + .next() + .map(|(target_function, _)| target_function) + { + return Some(symbol); + } + } + + if let Some(dyn_relas) = dyn_lib.plt_rel() { + let dyn_relas = dyn_relas.entries().iter(); + if let Some(symbol) = dyn_relas + .flat_map(|e| { + dyn_symbols + .resolve_name(e.symbol_index() as usize, string_table) + .map(|s| (e, s)) + }) + .filter(|(_, s)| s.eq("getpid")) + .next() + .map(|(target_function, _)| target_function) + { + return Some(symbol); + } + } + return None; +} + +/// Finding target function differs on 32 bit and 64 bit. +/// On 64 bit we want to check the addended relocations table only, opposed to the addendless relocations table. +/// Additionally, we will fall back to the plt given it is an addended relocation table. +#[cfg(target_pointer_width = "64")] +fn try_find_function<'a>( + dyn_lib: &'a DynamicLibrary, + dyn_symbols: &'a DynamicSymbols, +) -> Option<&'a plt_rs::elf64::DynRela> { + let string_table = dyn_lib.string_table(); + if let Some(dyn_relas) = dyn_lib.addend_relocs() { + let dyn_relas = dyn_relas.entries().iter(); + if let Some(symbol) = dyn_relas + .flat_map(|e| { + dyn_symbols + .resolve_name(e.symbol_index() as usize, string_table) + .map(|s| (e, s)) + }) + .filter(|(_, s)| s.eq("getpid")) + .next() + .map(|(target_function, _)| target_function) + { + return Some(symbol); + } + } + + if let Some(dyn_relas) = dyn_lib.plt_rela() { + let dyn_relas = dyn_relas.entries().iter(); + if let Some(symbol) = dyn_relas + .flat_map(|e| { + dyn_symbols + .resolve_name(e.symbol_index() as usize, string_table) + .map(|s| (e, s)) + }) + .filter(|(_, s)| s.eq("getpid")) + .next() + .map(|(target_function, _)| target_function) + { + return Some(symbol); + } + } + return None; +} + +fn main() -> Result<()> { + let my_pid = unsafe { libc::getpid() }; + println!("application pid is {my_pid}"); + + let executable_entry = find_executable().ok_or(anyhow!("unable to find target executable"))?; + println!("successfully identified executable"); + + let dyn_lib = DynamicLibrary::initialize(executable_entry)?; + println!("successfully initialied dynamic library for instrumentation"); + + let dyn_symbols = dyn_lib + .symbols() + .ok_or(anyhow!("dynamic lib should have symbols"))?; + let target_function = + try_find_function(&dyn_lib, &dyn_symbols).ok_or(anyhow!("unable to find getpid symbol"))?; + println!( + "successfully identified libc getpid offset: {:#X?}", + target_function.r_offset + ); + + let base_addr = dyn_lib.library().addr(); + let plt_fn_ptr = (base_addr + target_function.r_offset as usize) as *mut *mut c_void; + let page_size = unsafe { libc::sysconf(libc::_SC_PAGE_SIZE) as usize }; + let plt_page = ((plt_fn_ptr as usize / page_size) * page_size) as *mut c_void; + println!("page start for function is {plt_page:#X?}"); + + let _stored_address = unsafe { + // Set the memory page to read, write + let prot_res = libc::mprotect(plt_page, page_size, libc::PROT_WRITE | libc::PROT_READ); + if prot_res != 0 { + println!("protection res: {prot_res}"); + return Err(anyhow!("mprotect to rw")); + } + + // Replace the function address + let previous_address = std::ptr::replace(plt_fn_ptr, getpid as *mut _); + + // Set the memory page protection back to read only + let prot_res = libc::mprotect(plt_page, page_size, libc::PROT_READ); + if prot_res != 0 { + return Err(anyhow!("mprotect to r")); + } + + previous_address as *const c_void + }; + + let get_pid = unsafe { libc::getpid() }; + println!("new pid is: {get_pid}"); + + Ok(()) +} diff --git a/examples/libc_puts.rs b/examples/libc_puts.rs deleted file mode 100644 index c4721db..0000000 --- a/examples/libc_puts.rs +++ /dev/null @@ -1,27 +0,0 @@ -#[inline(never)] -unsafe fn puts_hooked(_input: *const libc::c_char) -> libc::c_int { - let c_str: &std::ffi::CStr = unsafe { std::ffi::CStr::from_ptr(_input) }; - let str_slice: &str = c_str.to_str().unwrap(); - - println!("Puts C was hooked. Intercepted: {:#?}", str_slice); - 0 -} - -fn get_mut_map<'a>() -> plt_rs::MutableLinkMap<'a> { - use plt_rs::LinkMapBacked; - - let link_map = plt_rs::LinkMapView::from_address(main as *mut libc::c_void as usize) - .expect("open link map"); - plt_rs::MutableLinkMap::from_view(link_map) -} - -fn main() -> Result<(), Box> { - let mut mutable_link_map = get_mut_map(); - - let _previous_function = mutable_link_map - .hook:: libc::c_int>("puts", puts_hooked as *const _)? - .unwrap(); - - unsafe { libc::puts(String::from("Hello\0").as_ptr() as *const _) }; - Ok(()) -} diff --git a/src/android_view.rs b/src/android_view.rs deleted file mode 100644 index 0446faa..0000000 --- a/src/android_view.rs +++ /dev/null @@ -1,133 +0,0 @@ -use crate::{ - unixy::{ElfAddr, ElfDyn, ElfPhdr}, - LinkMap, LinkMapBacked, -}; -use std::marker::PhantomData; - -#[derive(Debug)] -pub struct LinkMapView<'a> { - raw: LinkMap, - - // This is a copy of a link map actually in memory - // It should be bound to some lifetime - _life: PhantomData<&'a LinkMap>, -} - -impl<'a> LinkMapBacked<'a> for LinkMapView<'a> { - fn inner(&'a self) -> &'a LinkMap { - &self.raw - } - - fn dynamic_load_address(&'a self) -> ElfAddr { - self.inner().l_addr - } - - fn from_address(address: usize) -> Option> { - #[derive(Debug)] - struct IterateData { - address: usize, - result: Option<(ElfAddr, *const ElfDyn)>, - } - - let mut current_data = IterateData { - address, - result: None, - }; - - unsafe extern "C" fn iterate( - info: *mut libc::dl_phdr_info, - _size: libc::size_t, - data: *mut libc::c_void, - ) -> libc::c_int { - let data: &mut IterateData = &mut *(data as *mut IterateData); - - let Some(dl_info) = info.as_ref() else { - return 0; - }; - if !does_contain_address(dl_info, data.address) { - return 0; - }; - - let containing = find_dynamic_section(dl_info); - match containing { - Some(elf_dyn) => { - data.result = Some((dl_info.dlpi_addr, elf_dyn)); - 1 - } - None => 0, - } - } - - if unsafe { - libc::dl_iterate_phdr( - Some(iterate), - &mut current_data as *mut _ as *mut libc::c_void, - ) != 0 - } { - if let Some(result) = current_data.result { - return Some(LinkMapView::new(result.0, result.1)); - } - } - None - } -} - -fn does_contain_address(dl_info: &libc::dl_phdr_info, target_address: usize) -> bool { - for idx in 0..dl_info.dlpi_phnum as isize { - let phdr: *const ElfPhdr = unsafe { dl_info.dlpi_phdr.offset(idx) }; - - let phdr = unsafe { - match phdr.as_ref() { - Some(phdr) => phdr, - None => continue, - } - }; - - let base: usize = dl_info.dlpi_addr as usize + phdr.p_vaddr as usize; - if base <= target_address && target_address < base + phdr.p_memsz as usize { - return true; - } - } - - false -} - -fn find_dynamic_section(dl_info: &libc::dl_phdr_info) -> Option<*const ElfDyn> { - for idx in 0..dl_info.dlpi_phnum as isize { - let phdr: *const ElfPhdr = unsafe { dl_info.dlpi_phdr.offset(idx) }; - - let phdr = unsafe { - match phdr.as_ref() { - Some(phdr) => phdr, - None => return None, - } - }; - - if phdr.p_type == 0x02 { - unsafe { - return Some(std::mem::transmute::<*const _, *const ElfDyn>( - (dl_info.dlpi_addr as usize + phdr.p_vaddr as usize) as *const usize - as *const _, - )); - }; - } - } - - None -} - -impl<'a> LinkMapView<'a> { - fn new(l_addr: ElfAddr, l_ld: *const ElfDyn) -> Self { - Self { - raw: LinkMap { - l_addr, - l_name: std::ptr::null(), - l_ld, - l_next: std::ptr::null(), - l_prev: std::ptr::null(), - }, - - _life: PhantomData, - } - } -} diff --git a/src/elf32.rs b/src/elf32.rs new file mode 100644 index 0000000..6cc0c9c --- /dev/null +++ b/src/elf32.rs @@ -0,0 +1,96 @@ +use super::DynamicSectionType; + +pub type Word = libc::Elf32_Word; +// manual impl, signed word is i32; +pub type SignedWord = i32; +pub type Half = libc::Elf32_Half; +pub type Addr = libc::Elf32_Addr; +pub type ProgramHeader = libc::Elf32_Phdr; + +#[repr(C)] +#[derive(Debug)] +pub struct DynEntry { + pub d_tag: self::Word, + /// Either a value (Elf64_Xword) or an address (Elf64_Addr) + pub d_val_ptr: self::Word, +} + +#[repr(C)] +#[derive(Debug)] +pub struct DynSym { + pub st_name: self::Word, + pub st_value: self::Addr, + pub st_size: self::Word, + pub st_info: u8, + pub st_other: u8, + pub st_shndx: self::Half, +} + +#[repr(C)] +#[derive(Debug)] +pub struct DynRel { + pub r_offset: self::Addr, + pub r_info: self::Word, +} + +impl DynRel { + pub fn symbol_index(&self) -> self::Word { + (self.r_info >> 8) as self::Word + } + pub fn symbol_type(&self) -> self::Word { + (self.r_info & 0x0ff) as self::Word + } +} + +#[repr(C)] +#[derive(Debug)] +pub struct DynRela { + pub r_offset: self::Addr, + pub r_info: self::Word, + pub r_addend: self::SignedWord, +} + +impl DynRela { + pub fn symbol_index(&self) -> self::Word { + (self.r_info >> 8) as self::Word + } + pub fn symbol_type(&self) -> self::Word { + (self.r_info & 0x0ff) as self::Word + } +} + +/// An unknown Dynamic Section Type was observed +#[derive(Debug, thiserror::Error)] +#[error("Unknown Dynamic section type witnessed: `{0}`")] +pub struct DynTypeError(self::Word); + +impl TryFrom for DynamicSectionType { + type Error = DynTypeError; + fn try_from(value: self::Word) -> Result { + use DynamicSectionType::*; + Ok(match value { + 0 => DT_NULL, + + 2 => DT_PLTRELSZ, + 3 => DT_PLTGOT, + 20 => DT_PLTREL, + + 5 => DT_STRTAB, + 6 => DT_SYMTAB, + 11 => DT_SYMENT, + + 17 => DT_REL, + 18 => DT_RELSZ, + 19 => DT_RELENT, + + 7 => DT_RELA, + 8 => DT_RELASZ, + 9 => DT_RELAENT, + + 10 => DT_STRSZ, + 23 => DT_JMPREL, + + tag => return Err(DynTypeError(tag)), + }) + } +} diff --git a/src/elf64.rs b/src/elf64.rs new file mode 100644 index 0000000..3943722 --- /dev/null +++ b/src/elf64.rs @@ -0,0 +1,99 @@ +use super::DynamicSectionType; + +pub type Word = libc::Elf64_Word; +pub type Half = libc::Elf64_Half; +pub type Addr = libc::Elf64_Addr; +pub type ExtendedWord = libc::Elf64_Xword; + +// manual impl doesn't exist everywhere +pub type ExtendedSignedWord = i64; + +pub type ProgramHeader = libc::Elf64_Phdr; + +#[repr(C)] +#[derive(Debug)] +pub struct DynEntry { + pub d_tag: libc::Elf64_Xword, + /// Either a value (Elf64_Xword) or an address (Elf64_Addr) + pub d_val_ptr: libc::Elf64_Xword, +} + +#[repr(C)] +#[derive(Debug)] +pub struct DynSym { + pub st_name: self::Word, + pub st_info: u8, + pub st_other: u8, + pub st_shndx: self::Half, + pub st_value: self::Addr, + pub st_size: self::ExtendedWord, +} + +#[repr(C)] +#[derive(Debug)] +pub struct DynRel { + pub r_offset: self::Addr, + pub r_info: self::ExtendedWord, +} + +impl DynRel { + pub fn symbol_index(&self) -> self::Word { + (self.r_info >> 32) as self::Word + } + pub fn symbol_type(&self) -> self::Word { + (self.r_info & 0xffffffff) as self::Word + } +} + +#[repr(C)] +#[derive(Debug)] +pub struct DynRela { + pub r_offset: self::Addr, + pub r_info: self::ExtendedWord, + pub r_addend: self::ExtendedSignedWord, +} + +impl DynRela { + pub fn symbol_index(&self) -> self::Word { + (self.r_info >> 32) as self::Word + } + pub fn symbol_type(&self) -> self::Word { + (self.r_info & 0xffffffff) as self::Word + } +} + +/// An unknown Dynamic Section Type was observed +#[derive(Debug, thiserror::Error)] +#[error("Unknown Dynamic section type witnessed: `{0}`")] +pub struct DynTypeError(self::ExtendedWord); + +impl TryFrom for DynamicSectionType { + type Error = DynTypeError; + fn try_from(value: self::ExtendedWord) -> Result { + use DynamicSectionType::*; + Ok(match value { + 0 => DT_NULL, + + 2 => DT_PLTRELSZ, + 3 => DT_PLTGOT, + 20 => DT_PLTREL, + + 5 => DT_STRTAB, + 6 => DT_SYMTAB, + 11 => DT_SYMENT, + + 17 => DT_REL, + 18 => DT_RELSZ, + 19 => DT_RELENT, + + 7 => DT_RELA, + 8 => DT_RELASZ, + 9 => DT_RELAENT, + + 10 => DT_STRSZ, + 23 => DT_JMPREL, + + tag => return Err(DynTypeError(tag)), + }) + } +} diff --git a/src/lib.rs b/src/lib.rs index dcd0db6..5c68ff3 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -1,298 +1,582 @@ -use std::{borrow::Cow, ffi::c_int}; - -use libc::{c_void, mprotect, PROT_READ, PROT_WRITE, _SC_PAGE_SIZE}; -use thiserror::Error; -use unixy::{ElfAddr, ElfDyn, ElfSym, LinkMap, SectionType, R_GLOB_DAT, R_JUMP_SLOT}; - -mod unixy; - -#[cfg(target_os = "android")] -mod android_view; -#[cfg(target_os = "android")] -pub use android_view::LinkMapView; - -#[cfg(target_os = "linux")] -mod unix_view; -#[cfg(target_os = "linux")] -pub use unix_view::LinkMapView; - -#[derive(Debug, Error)] -pub enum PltError { - #[error( - "Unable to mprotect address, unaligned: {0:X?}, aligned: {1:X?}, desired flags: {2:?}, response: {3:?}" - )] - Protection(*const c_void, *const c_void, c_int, c_int), - - #[error("Expected the presence of section `{0:#?}`")] - Section(SectionType), -} - -pub type PltResult = Result; - -#[derive(Debug)] -pub struct StringTableView<'a> { - raw: &'a [libc::c_char], -} - -impl<'a> StringTableView<'a> { - pub fn get(&self, index: usize) -> Option> { - match index >= self.raw.len() { - true => None, - false => unsafe { Some(std::ffi::CStr::from_ptr(&self.raw[index]).to_string_lossy()) }, - } - } -} - -fn raw_query_name<'b>( - index: isize, - dyn_syms: *const ElfSym, - string_table: &'b StringTableView, -) -> Option> { - let idx = unsafe { dyn_syms.offset(index).as_ref()? }; - match idx.st_name == 0 { - true => None, - false => string_table.get(idx.st_name as usize), - } -} - -pub trait LinkMapBacked<'a>: Sized { - fn inner(&'a self) -> &'a LinkMap; - - fn dynamic_load_address(&'a self) -> ElfAddr; - - fn from_address(address: usize) -> Option; - - fn from_executable() -> Option { - let executable_name = std::env::current_exe().ok()?; - let pid = std::process::id(); - - let process_map = proc_maps::get_process_maps(pid as i32) - .ok()? - .into_iter() - .find(|m| match m.filename() { - Some(file_name) => executable_name == file_name, - None => false, - })?; - - Self::from_address(process_map.start() + process_map.size() / 2) - } - - #[cfg(target_pointer_width = "64")] - fn rel_dyn(&'a self) -> Option<&'a [unixy::ElfRela]> { - let rela = self.try_find_section(SectionType::DT_RELA)?; - let relasz = self.try_find_section(SectionType::DT_RELASZ)?.d_val as usize; - let relaent = self.try_find_section(SectionType::DT_RELAENT)?.d_val as usize; - let entries_count = relasz / relaent; - let entries = (rela.d_val + self.dynamic_load_address()) as *const unixy::ElfRela; - let entries = unsafe { std::slice::from_raw_parts(entries, entries_count) }; - Some(entries) - } - - #[cfg(target_pointer_width = "64")] - fn plt_dyn(&'a self) -> Option<&'a [unixy::ElfRela]> { - let rela = self.try_find_section(SectionType::DT_JMPREL)?; - let relasz = self.try_find_section(SectionType::DT_PLTRELSZ)?.d_val as usize; - let relaent = std::mem::size_of::(); - let entries_count = relasz / relaent; - let entries = (rela.d_val + self.dynamic_load_address()) as *const unixy::ElfRela; - let entries = unsafe { std::slice::from_raw_parts(entries, entries_count) }; - Some(entries) - } - - #[cfg(target_pointer_width = "32")] - fn rel_dyn(&'a self) -> Option<&'a [unixy::ElfRel]> { - let rela = self.try_find_section(SectionType::DT_REL)?; - let relasz = self.try_find_section(SectionType::DT_RELSZ)?.d_val as usize; - let relaent = self.try_find_section(SectionType::DT_RELENT)?.d_val as usize; - let entries_count = relasz / relaent; - let entries = (rela.d_val + self.dynamic_load_address()) as *const unixy::ElfRel; - let entries = unsafe { std::slice::from_raw_parts(entries, entries_count) }; - Some(entries) - } - - #[cfg(target_pointer_width = "32")] - fn plt_dyn(&'a self) -> Option<&'a [unixy::ElfRel]> { - let rela = self.try_find_section(SectionType::DT_JMPREL)?; - let relasz = self.try_find_section(SectionType::DT_PLTRELSZ)?.d_val as usize; - let relaent = std::mem::size_of::(); - let entries_count = relasz / relaent; - let entries = (rela.d_val + self.dynamic_load_address()) as *const unixy::ElfRel; - let entries = unsafe { std::slice::from_raw_parts(entries, entries_count) }; - Some(entries) - } - - fn load_address(&'a self) -> ElfAddr { - self.inner().l_addr - } - - fn dynamic_section(&'a self) -> Option<&'a ElfDyn> { - unsafe { self.inner().l_ld.as_ref() } - } - - fn try_find_section(&'a self, tag: SectionType) -> Option<&'a ElfDyn> { - let mut dyn_section = self.dynamic_section(); - while let Some(section) = dyn_section { - if section.d_tag == 0 { - break; - } - - if section.d_tag == tag.into() { - return Some(section); - } - - dyn_section = unsafe { (section as *const ElfDyn).offset(1).as_ref() }; - } - - None - } - - fn find_section(&'a self, tag: SectionType) -> PltResult<&'a ElfDyn> { - self.try_find_section(tag).ok_or(PltError::Section(tag)) - } - - fn string_table(&'a self) -> PltResult> { - let dyn_strs = self.find_section(SectionType::DT_STRTAB)?; - let dyn_strs = (dyn_strs.d_val + self.dynamic_load_address()) as *const libc::c_char; - let dyn_str_size = self.find_section(SectionType::DT_STRSZ)?.d_val as usize; - Ok(StringTableView { - raw: unsafe { std::slice::from_raw_parts(dyn_strs, dyn_str_size) }, - }) - } - - fn find_symbol(&'a self, symbol_name: &str) -> PltResult> { - let sym_tab = self.find_section(SectionType::DT_SYMTAB)?; - let dyn_syms = (sym_tab.d_val + self.dynamic_load_address()) as *const ElfSym; - let string_table = self.string_table()?; - - if let Some(entries) = self.rel_dyn() { - for entry in entries.iter().filter(|e| e.symbol_type() == R_GLOB_DAT) { - let queried_name = - raw_query_name(entry.symbol_index() as isize, dyn_syms, &string_table); - - if let Some(current_name) = queried_name { - if current_name == symbol_name { - let plt_pointer = - (entry.r_offset + self.load_address()) as *mut *const c_void; - return Ok(Some(plt_pointer)); - } - } - } - } - - if let Some(entries) = self.plt_dyn() { - for entry in entries.iter().filter(|e| e.symbol_type() == R_JUMP_SLOT) { - let queried_name = - raw_query_name(entry.symbol_index() as isize, dyn_syms, &string_table); - - if let Some(current_name) = queried_name { - if current_name == symbol_name { - let plt_pointer = - (entry.r_offset + self.load_address()) as *mut *const c_void; - return Ok(Some(plt_pointer)); - } - } - } - } - Ok(None) - } -} - -pub struct MutableLinkMap<'a> { - view: LinkMapView<'a>, -} - -impl<'a> MutableLinkMap<'a> { - pub fn from_view(view: LinkMapView<'a>) -> Self { - Self { view } - } - - fn replace_address( - func_ptr: *mut *const c_void, - destination: *const c_void, - ) -> PltResult<*const c_void> { - let page_size = unsafe { libc::sysconf(_SC_PAGE_SIZE) as usize }; - let aligned_address = ((func_ptr as usize / page_size) * page_size) as *mut c_void; - - unsafe { - // Set the memory page to read, write - let prot_res = mprotect(aligned_address, page_size, PROT_WRITE | PROT_READ); - if prot_res != 0 { - return Err(PltError::Protection( - func_ptr as *mut _, - aligned_address, - PROT_READ | PROT_WRITE, - std::io::Error::last_os_error().raw_os_error().unwrap(), - )); - } - - // Replace the previous function address - let previous_address = std::ptr::replace(func_ptr, destination); - - // Set the memory page protection back to read only - let prot_res = mprotect(aligned_address, page_size, PROT_READ); - if prot_res != 0 { - return Err(PltError::Protection( - func_ptr as *mut _, - aligned_address, - PROT_READ, - std::io::Error::last_os_error().raw_os_error().unwrap(), - )); - } - - Ok(previous_address as *const c_void) - } - } - - pub fn hook( - &'a mut self, - symbol_name: &str, - desired_function: *const FnT, - ) -> PltResult>> - where - FnT: Copy, - { - match self.view.find_symbol(symbol_name)? { - Some(symbol) => { - let previous_address = - Self::replace_address(symbol, desired_function as *const c_void)?; - let previous_function = - unsafe { *((&previous_address as *const *const c_void) as *const FnT) }; - Ok(Some(FunctionHook:: { - symbol_name: symbol_name.to_owned(), - cached_function: previous_function, - })) - } - None => Ok(None), - } - } - - pub fn restore(&'a mut self, function_hook: FunctionHook) -> PltResult> - where - FnT: Copy, - { - match self.view.find_symbol(&function_hook.symbol_name)? { - Some(symbol) => { - let hooked_fn_address = unsafe { - *((&function_hook.cached_function as *const FnT) as *const *const c_void) - }; - let hooked_fn = Self::replace_address(symbol, hooked_fn_address)? as *const FnT; - let hooked_fn = unsafe { *((&hooked_fn as *const *const FnT) as *const FnT) }; - - Ok(Some(hooked_fn)) - } - None => Ok(None), - } - } -} - -#[derive(Debug)] -pub struct FunctionHook { - symbol_name: String, - cached_function: T, -} - -impl FunctionHook { - pub fn cached_function(&self) -> &T { - &self.cached_function - } -} +use std::borrow::Cow; +use thiserror::Error; + +#[cfg(target_pointer_width = "64")] +pub mod elf64; +#[cfg(target_pointer_width = "64")] +use elf64 as elf; + +#[cfg(target_pointer_width = "32")] +pub mod elf32; +#[cfg(target_pointer_width = "32")] +use elf32 as elf; + +/// Errors related to dynamic libraries +#[derive(Debug, Error)] +pub enum DynamicError { + /// Tried to cast from a raw type section and was unmapped + #[error("Unknown type witnessed: `{0}`")] + TypeCast(#[from] elf::DynTypeError), + + /// Given prescence of `0` section type, `1` section type would be required + #[error("Given the prescence of `{0:#?}`, expected prescence of `{1:#?}`")] + DependentSection(DynamicSectionType, DynamicSectionType), + + #[error("Failed to parse, required section missing `{0:#?}`")] + RequiredSection(DynamicSectionType), + + #[error("No dynamic program header available")] + ProgramHeader, +} + +/// Section type enumeration +#[derive(Debug, Clone, Copy, PartialEq, PartialOrd)] +#[allow(non_camel_case_types)] +pub enum DynamicSectionType { + DT_NULL, + DT_PLTRELSZ, + DT_PLTGOT, + DT_PLTREL, + + DT_STRTAB, + DT_SYMTAB, + DT_SYMENT, + + DT_RELA, + DT_RELASZ, + DT_RELAENT, + + DT_REL, + DT_RELSZ, + DT_RELENT, + + DT_STRSZ, + DT_JMPREL, +} + +/// Container of Dynamic Relocations +pub struct DynamicRelocations<'a> { + inner: &'a [elf::DynRel], +} + +impl DynamicRelocations<'_> { + /// Extract string from table starting at carrot position + pub fn read_at(&self, index: usize) -> Option<&elf::DynRel> { + self.inner.get(index) + } + + /// Dynamic relocations internal slice + pub fn entries(&self) -> &[elf::DynRel] { + self.inner + } +} + +/// Container of Dynamic Addend Relocations +pub struct DynamicAddendRelocations<'a> { + inner: &'a [elf::DynRela], +} + +impl DynamicAddendRelocations<'_> { + /// Extract string from table starting at carrot position + pub fn read_at(&self, index: usize) -> Option<&elf::DynRela> { + self.inner.get(index) + } + + /// Dynamic addend relocations internal slice + pub fn entries(&self) -> &[elf::DynRela] { + self.inner + } +} + +/// Container of Dynamic Symbols +pub struct DynamicSymbols<'a> { + inner: &'a elf::DynSym, +} + +impl DynamicSymbols<'_> { + /// gets the dynamic symbol at this index + fn get(&self, index: usize) -> Option<&elf::DynSym> { + unsafe { (self.inner as *const elf::DynSym).add(index).as_ref() } + } + + /// resolves the name of the dynamic symbol at `index` + pub fn resolve_name<'b>( + &'b self, + index: usize, + string_table: &'b StringTable<'b>, + ) -> Option> { + let entry = self.get(index)?; + string_table.read_at(entry.st_name as usize) + } +} + +/// Container of Dynamic Entries +pub struct DynamicSection<'a> { + inner: &'a elf::DynEntry, +} + +#[derive(Debug)] +/// A view of the Library's String table +/// The inner `raw` reference refers to a continguous array of zero terminated strings. +/// The string table view is needed to arbitrarily access into the data and pull out the null terminated strings. +pub struct StringTable<'a> { + raw: &'a [libc::c_char], +} + +impl<'a> StringTable<'a> { + /// Extract string from table starting at carrot position + pub fn read_at(&self, carrot: usize) -> Option> { + match carrot >= self.raw.len() { + true => None, + false => unsafe { Some(std::ffi::CStr::from_ptr(&self.raw[carrot]).to_string_lossy()) }, + } + } + + /// total size of the string table in memory. + /// This does not reflect how many strings + pub fn total_size(&self) -> usize { + self.raw.len() + } +} + +impl DynamicSection<'_> { + /// Iterate dynamic section's DynEntry link list attempting to find section with target section type + fn find_section(&self, tag: DynamicSectionType) -> Option<&elf::DynEntry> { + let mut current = Some(self.inner); + while let Some(inner) = current { + match DynamicSectionType::try_from(inner.d_tag) { + Ok(DynamicSectionType::DT_NULL) => return None, + Ok(this_tag) if this_tag == tag => return Some(inner), + Ok(_) => { + // nothing to do. + } + Err(_err) => { + // continue for now...; + } + } + + current = unsafe { (inner as *const elf::DynEntry).offset(1).as_ref() }; + } + + None + } +} + +/// An Elf Program Header +/// Primary examples are PT_LOAD and PT_DYNAMIC +pub struct ProgramHeader<'a> { + inner: &'a elf::ProgramHeader, +} + +impl ProgramHeader<'_> { + /// Access the program headers type + pub fn header_type(&self) -> elf::Word { + self.inner.p_type + } + + /// Access the program headers virtual address + pub fn virtual_addr(&self) -> usize { + self.inner.p_vaddr as usize + } + + /// Total size in memory + pub fn memory_size(&self) -> usize { + self.inner.p_memsz as usize + } + + /// File size + pub fn file_size(&self) -> usize { + self.inner.p_filesz as usize + } + + /// Program headers absolute address + pub fn program_addr(&self) -> usize { + self.inner.p_paddr as usize + } + + /// Program headers offset + pub fn offset(&self) -> usize { + self.inner.p_offset as usize + } +} + +/// A dynamic libraries plt maybe be addend entries or non addend entries +pub enum RelocationTable<'a> { + WithAddend(DynamicAddendRelocations<'a>), + WithoutAddend(DynamicRelocations<'a>), +} + +/// Dynamic Library Entry +/// An 'upgraded' LibraryEntry with the dynamic section resolved. +pub struct DynamicLibrary<'a> { + library: LoadedLibrary<'a>, + dyn_section: DynamicSection<'a>, + dyn_string_table: StringTable<'a>, + + dyn_symbols: Option>, + dyn_relocs: Option>, + dyn_addend_relocs: Option>, + dyn_plt: Option>, +} + +/// Access the libraries dynamic symbols through the library's dynamic section +fn extract_dyn_symbols<'a, 'b>( + lib: &'a LoadedLibrary<'a>, + dynamic_section: &'a DynamicSection<'a>, +) -> std::result::Result>, DynamicError> { + // No actual requirement for dynamic symbols. + let Some(dyn_symbol_table) = dynamic_section.find_section(DynamicSectionType::DT_SYMTAB) else { + return Ok(None); + }; + + // We use explicit Elf Dynamic entry structs. + // The SYMENT size doesn't seem relevant anymore, so we can assert it the same size as the dyn entry to combat any egregious misusages + let table_size = dynamic_section + .find_section(DynamicSectionType::DT_SYMENT) + .ok_or(DynamicError::DependentSection( + DynamicSectionType::DT_SYMTAB, + DynamicSectionType::DT_SYMENT, + ))? + .d_val_ptr as usize; + assert_eq!(table_size, std::mem::size_of::()); + + // We don't have enough information to tell if this elf represents an Object Mapped or Shared Library / Executable mapped entry + // For object mapped the ptr's are relative. So we have to rebase by the virtual address from dl_info + let dyn_sym_ptr = match dyn_symbol_table.d_val_ptr as usize <= lib.addr() { + false => dyn_symbol_table.d_val_ptr as usize, + true => dyn_symbol_table.d_val_ptr as usize + lib.addr(), + } as *const elf::DynSym; + + Ok(Some(DynamicSymbols { + inner: unsafe { dyn_sym_ptr.as_ref().unwrap() }, + })) +} + +/// Access the libraries dynamic section by dereferencing the PT_DYN program header's virtual address value +fn extract_dyn_section<'a, 'b>( + lib: &'a LoadedLibrary<'a>, +) -> std::result::Result, DynamicError> { + let dynamic_header = lib + .program_headers() + .find(|p_h| p_h.header_type() == 0x02) + .ok_or(DynamicError::ProgramHeader)?; + + let dynamic_sections = lib.addr() + dynamic_header.virtual_addr(); + let dynamic_sections = dynamic_sections as *const elf::DynEntry; + Ok(DynamicSection { + inner: unsafe { dynamic_sections.as_ref().unwrap() }, + }) +} + +/// Access the libraries string table through the library's dynamic section +fn extract_dyn_string_table<'a, 'b>( + lib: &'a LoadedLibrary<'a>, + dynamic_section: &'a DynamicSection<'a>, +) -> std::result::Result, DynamicError> { + let str_table_entry = dynamic_section + .find_section(DynamicSectionType::DT_STRTAB) + .ok_or(DynamicError::RequiredSection(DynamicSectionType::DT_STRTAB))?; + let table_size = dynamic_section + .find_section(DynamicSectionType::DT_STRSZ) + .ok_or(DynamicError::DependentSection( + DynamicSectionType::DT_STRTAB, + DynamicSectionType::DT_STRSZ, + ))? + .d_val_ptr as usize; + + // We don't have enough information to tell if this elf represents an Object Mapped or Shared Library / Executable mapped entry + // For object mapped the ptr's are relative. So we have to rebase by the virtual address from dl_info + let str_table_ptr = match str_table_entry.d_val_ptr as usize <= lib.addr() { + false => str_table_entry.d_val_ptr as usize, + true => str_table_entry.d_val_ptr as usize + lib.addr(), + } as *const libc::c_char; + + Ok(StringTable { + raw: unsafe { std::slice::from_raw_parts(str_table_ptr, table_size) }, + }) +} + +/// Access the libaries dynamic relocations through the dynamic program header +fn extract_dyn_relocs<'a, 'b>( + lib: &'a LoadedLibrary<'a>, + dynamic_section: &'a DynamicSection<'a>, +) -> std::result::Result>, DynamicError> { + let Some(dyn_rel_entry) = dynamic_section.find_section(DynamicSectionType::DT_REL) else { + return Ok(None); + }; + + let total_size = dynamic_section + .find_section(DynamicSectionType::DT_RELSZ) + .ok_or(DynamicError::DependentSection( + DynamicSectionType::DT_REL, + DynamicSectionType::DT_RELSZ, + ))? + .d_val_ptr as usize; + let entry_size = dynamic_section + .find_section(DynamicSectionType::DT_RELENT) + .ok_or(DynamicError::DependentSection( + DynamicSectionType::DT_REL, + DynamicSectionType::DT_RELENT, + ))? + .d_val_ptr as usize; + + assert_eq!(entry_size, std::mem::size_of::()); + + let entry_count = total_size / entry_size; + // We don't have enough information to tell if this elf represents an Object Mapped or Shared Library / Executable mapped entry + // For object mapped the ptr's are relative. So we have to rebase by the virtual address from dl_info + let dyn_rel_entry = match dyn_rel_entry.d_val_ptr as usize <= lib.addr() { + false => dyn_rel_entry.d_val_ptr as usize, + true => dyn_rel_entry.d_val_ptr as usize + lib.addr(), + } as *const elf::DynRel; + + Ok(Some(DynamicRelocations { + inner: unsafe { std::slice::from_raw_parts(dyn_rel_entry, entry_count) }, + })) +} + +/// Access the libaries dynamic addend relocations through the dynamic program header +fn extract_dyn_addend_relocs<'a, 'b>( + lib: &'a LoadedLibrary<'a>, + dynamic_section: &'a DynamicSection<'a>, +) -> std::result::Result>, DynamicError> { + let Some(dyn_rel_entry) = dynamic_section.find_section(DynamicSectionType::DT_RELA) else { + return Ok(None); + }; + + let total_size = dynamic_section + .find_section(DynamicSectionType::DT_RELASZ) + .ok_or(DynamicError::DependentSection( + DynamicSectionType::DT_RELA, + DynamicSectionType::DT_RELASZ, + ))? + .d_val_ptr as usize; + let entry_size = dynamic_section + .find_section(DynamicSectionType::DT_RELAENT) + .ok_or(DynamicError::DependentSection( + DynamicSectionType::DT_RELA, + DynamicSectionType::DT_RELAENT, + ))? + .d_val_ptr as usize; + + assert_eq!(entry_size, std::mem::size_of::()); + + let entry_count = total_size / entry_size; + // We don't have enough information to tell if this elf represents an Object Mapped or Shared Library / Executable mapped entry + // For object mapped the ptr's are relative. So we have to rebase by the virtual address from dl_info + let dyn_rel_entry = match dyn_rel_entry.d_val_ptr as usize <= lib.addr() { + false => dyn_rel_entry.d_val_ptr as usize, + true => dyn_rel_entry.d_val_ptr as usize + lib.addr(), + } as *const elf::DynRela; + + Ok(Some(DynamicAddendRelocations { + inner: unsafe { std::slice::from_raw_parts(dyn_rel_entry, entry_count) }, + })) +} + +/// Access the libraries plt relocations +fn extract_dyn_plt<'a, 'b>( + lib: &'a LoadedLibrary<'a>, + dynamic_section: &'a DynamicSection<'a>, +) -> std::result::Result>, DynamicError> { + // decipher if its rel or rela relocation entries + // if this isn't present we can't have a plt + let Some(dyn_type) = dynamic_section.find_section(DynamicSectionType::DT_PLTREL) else { + return Ok(None); + }; + + let relocation_type = DynamicSectionType::try_from(dyn_type.d_val_ptr)?; + + let dyn_plt_entry = dynamic_section + .find_section(DynamicSectionType::DT_JMPREL) + .ok_or(DynamicError::DependentSection( + DynamicSectionType::DT_PLTREL, + DynamicSectionType::DT_JMPREL, + ))?; + let total_size = dynamic_section + .find_section(DynamicSectionType::DT_PLTRELSZ) + .ok_or(DynamicError::DependentSection( + DynamicSectionType::DT_PLTREL, + DynamicSectionType::DT_PLTRELSZ, + ))? + .d_val_ptr as usize; + + let entry_addr = match dyn_plt_entry.d_val_ptr as usize <= lib.addr() { + false => dyn_plt_entry.d_val_ptr as usize, + true => dyn_plt_entry.d_val_ptr as usize + lib.addr(), + }; + + Ok(match relocation_type { + DynamicSectionType::DT_REL => { + let entry_count = total_size / std::mem::size_of::(); + Some(RelocationTable::WithoutAddend(DynamicRelocations { + inner: unsafe { + std::slice::from_raw_parts(entry_addr as *const elf::DynRel, entry_count) + }, + })) + } + DynamicSectionType::DT_RELA => { + let entry_count = total_size / std::mem::size_of::(); + Some(RelocationTable::WithAddend(DynamicAddendRelocations { + inner: unsafe { + std::slice::from_raw_parts(entry_addr as *const elf::DynRela, entry_count) + }, + })) + } + _ => None, + }) +} + +impl<'a> DynamicLibrary<'a> { + /// Try to consume a LoadedLibrary and create a resolved Dynamic view + /// The Dynamic Library will take ownership of the load library as well as store + /// all relevant dynamic sections for easy access and symbol resolution + pub fn initialize(lib: LoadedLibrary<'a>) -> std::result::Result { + let dyn_section = extract_dyn_section(&lib)?; + let dyn_string_table = extract_dyn_string_table(&lib, &dyn_section)?; + let dyn_symbols = extract_dyn_symbols(&lib, &dyn_section)?; + let dyn_relocs = extract_dyn_relocs(&lib, &dyn_section)?; + let dyn_addend_relocs = extract_dyn_addend_relocs(&lib, &dyn_section)?; + let dyn_plt = extract_dyn_plt(&lib, &dyn_section)?; + + Ok(Self { + library: lib, + dyn_section, + dyn_string_table, + dyn_symbols, + dyn_relocs, + dyn_addend_relocs, + dyn_plt, + }) + } + + /// Access the plt as a dynamic relocation table if possible + /// can fail if the plt is not available or the plt is with addend + pub fn plt_rel(&self) -> Option<&DynamicRelocations<'_>> { + match self.plt() { + Some(RelocationTable::WithoutAddend(relocs)) => Some(relocs), + _ => None, + } + } + + /// Access the plt as a dynamic addend relocation table if possible + /// can fail if the plt is not available or the plt is without addend + pub fn plt_rela(&self) -> Option<&DynamicAddendRelocations<'_>> { + match self.plt() { + Some(RelocationTable::WithAddend(relocs)) => Some(relocs), + _ => None, + } + } + /// Access the dynamic libraries plt if available + /// Can be either a DynamicRelocations or DynamicAddendRelocations + pub fn plt(&self) -> Option<&RelocationTable<'_>> { + self.dyn_plt.as_ref() + } + + /// Access the dynamic libraries relocations if available + pub fn relocs(&self) -> Option<&DynamicRelocations<'_>> { + self.dyn_relocs.as_ref() + } + + /// Access the dynamic libraries addend relocations if available + pub fn addend_relocs(&self) -> Option<&DynamicAddendRelocations<'_>> { + self.dyn_addend_relocs.as_ref() + } + + /// Access the dynamic libraries symbol table if available + pub fn symbols(&self) -> Option<&DynamicSymbols<'_>> { + self.dyn_symbols.as_ref() + } + + /// Access the dynamic libraries dynamic section + pub fn dyn_section(&self) -> &DynamicSection<'_> { + &self.dyn_section + } + + /// Access the dynamic libraries backing general loaded library structure + /// capable of providing the name and base address of the in memory + pub fn library(&self) -> &LoadedLibrary<'_> { + &self.library + } + + /// Access the dynamic string table + pub fn string_table(&self) -> &StringTable<'_> { + &self.dyn_string_table + } +} + +/// A library loaded in the process +pub struct LoadedLibrary<'a> { + addr: usize, + name: Cow<'a, str>, + program_headers: &'a [elf::ProgramHeader], +} + +impl LoadedLibrary<'_> { + /// Access the libraries string name + /// This is more the libraries `path` than the name per say + pub fn name(&self) -> &str { + &self.name + } + + /// Access the libraries virtual address + pub fn addr(&self) -> usize { + self.addr + } + + /// Iterate the libraries program headers + pub fn program_headers(&self) -> impl Iterator> { + self.program_headers + .iter() + .map(|header| ProgramHeader { inner: header }) + } + + /// Access the libraries PT_INTERP program headers + pub fn interpreter_header(&self) -> Option> { + self.program_headers().find(|p_h| p_h.header_type() == 0x03) + } + + /// Access the libraries PT_LOAD program headers + pub fn load_headers(&self) -> impl Iterator> { + self.program_headers() + .filter(|p_h| p_h.header_type() == 0x01) + } +} + +/// Returns a `Vec` of objects loaded into the current address space. +pub fn collect_modules<'a>() -> Vec> { + let mut ret = Vec::new(); + + // Pushes an `Object` into the result vector on the behalf of C. + extern "C" fn push_object(objs: &mut Vec, dl_info: &libc::dl_phdr_info) { + let name = unsafe { std::ffi::CStr::from_ptr(dl_info.dlpi_name) }.to_string_lossy(); + // We have to copy sthe `dl_phdr_info` struct out, as the same memory buffer is used for + // each entry during the iteration process. Otherwise we could have used a vector of + // pointers. + let program_headers = + unsafe { std::slice::from_raw_parts(dl_info.dlpi_phdr, dl_info.dlpi_phnum as usize) }; + objs.push(LoadedLibrary { + addr: dl_info.dlpi_addr as usize, + name, + program_headers, + }); + } + + // Callback for `dl_iterate_phdr(3)`. + unsafe extern "C" fn collect_objs( + info: *mut libc::dl_phdr_info, + _sz: usize, + data: *mut libc::c_void, + ) -> libc::c_int { + if let Some(info) = unsafe { info.as_ref() } { + push_object(&mut *(data as *mut Vec), info); // Get Rust to push the object. + }; + + 0 + } + + let ret_void_p = &mut ret as *mut Vec as *mut libc::c_void; + unsafe { libc::dl_iterate_phdr(Some(collect_objs), ret_void_p) }; + + ret +} diff --git a/src/unix_view.rs b/src/unix_view.rs deleted file mode 100644 index 46aa10b..0000000 --- a/src/unix_view.rs +++ /dev/null @@ -1,97 +0,0 @@ -use std::{borrow::Cow, ffi::CStr}; - -use crate::{unixy::ElfAddr, LinkMap, LinkMapBacked}; - -#[derive(Debug)] -pub struct LinkMapView<'a> { - raw: &'a LinkMap, -} - -impl<'a> LinkMapView<'a> { - pub fn next(&self) -> Option> { - let candidate_next = self.inner().l_next; - unsafe { candidate_next.as_ref() }.map(|r| LinkMapView { raw: r }) - } - - pub fn previous(&self) -> Option> { - let candidate_next = self.inner().l_prev; - unsafe { candidate_next.as_ref() }.map(|r| LinkMapView { raw: r }) - } - - pub fn name(&self) -> Option> { - match self.inner().l_name.is_null() { - true => None, - false => unsafe { Some(CStr::from_ptr(self.inner().l_name).to_string_lossy()) }, - } - } - - pub fn from_shared_library(library_name: &str) -> Option> { - let mut output: *mut LinkMap = std::ptr::null_mut(); - - unsafe { - let handle = libc::dlopen( - library_name.as_ptr() as *const libc::c_char, - libc::RTLD_LAZY | libc::RTLD_NOLOAD, - ); - - if handle.is_null() { - return None; - } - - let res = libc::dlinfo( - handle, - libc::RTLD_DI_LINKMAP, - &mut output as *mut *mut LinkMap as *mut libc::c_void, - ); - - if libc::dlclose(handle) != 0 { - // todo - } - - if res == -1 { - return None; - } - - Some(LinkMapView { - raw: output.as_ref()?, - }) - } - } -} - -impl<'a> LinkMapBacked<'a> for LinkMapView<'a> { - fn inner(&'a self) -> &'a LinkMap { - self.raw - } - - fn dynamic_load_address(&'a self) -> ElfAddr { - 0 - } - - fn from_address(address: usize) -> Option> { - let mut info = libc::Dl_info { - dli_fname: std::ptr::null(), - dli_fbase: std::ptr::null_mut(), - dli_sname: std::ptr::null(), - dli_saddr: std::ptr::null_mut(), - }; - - let mut output = std::ptr::null_mut(); - unsafe { - let addr_result = libc::dladdr1( - address as *const libc::c_void, - &mut info, - &mut output, - libc::RTLD_DI_LINKMAP, - ); - if addr_result == 0 { - return None; - } - - let output: *mut LinkMap = output as *mut _ as *mut LinkMap; - Some(LinkMapView { - raw: output.as_ref()?, - }) - } - } -} diff --git a/src/unixy.rs b/src/unixy.rs deleted file mode 100644 index 890168c..0000000 --- a/src/unixy.rs +++ /dev/null @@ -1,249 +0,0 @@ -// 32 bit - -#[cfg(all(target_os = "android", target_pointer_width = "32"))] -pub type ElfPhdr = libc::Elf32_Phdr; - -#[cfg(target_pointer_width = "32")] -pub type ElfAddr = libc::Elf32_Addr; - -#[cfg(target_pointer_width = "32")] -pub type ElfWord = libc::Elf32_Word; - -#[cfg(target_pointer_width = "32")] -pub type ElfSword = libc::c_int; - -#[cfg(target_pointer_width = "32")] -pub type ElfHalf = libc::Elf32_Half; - -// 64 bit -#[cfg(all(target_os = "android", target_pointer_width = "64"))] -pub type ElfPhdr = libc::Elf64_Phdr; - -#[cfg(target_pointer_width = "64")] -pub type ElfAddr = libc::Elf64_Addr; - -#[cfg(target_pointer_width = "64")] -pub type ElfWord = libc::Elf64_Word; - -#[cfg(target_pointer_width = "64")] -pub type ElfXword = libc::Elf64_Xword; - -#[cfg(target_pointer_width = "64")] -pub type ElfSxword = i64; - -#[cfg(target_pointer_width = "64")] -pub type ElfHalf = libc::Elf64_Half; - -#[cfg(target_pointer_width = "64")] -#[repr(C)] -#[derive(Debug)] -pub struct ElfDyn { - pub d_tag: ElfSxword, - pub d_val: ElfXword, -} - -#[cfg(target_pointer_width = "32")] -#[repr(C)] -#[derive(Debug)] -pub struct ElfDyn { - pub d_tag: ElfSword, - pub d_val: ElfWord, -} - -#[cfg(target_pointer_width = "64")] -#[repr(C)] -#[derive(Debug)] -pub struct ElfRela { - pub r_offset: ElfAddr, - pub r_info: ElfXword, - pub r_addend: ElfSxword, -} - -#[cfg(target_pointer_width = "32")] -#[repr(C)] -#[derive(Debug)] -pub struct ElfRela { - pub r_offset: ElfAddr, - pub r_info: ElfWord, - pub r_addend: ElfSword, -} - -#[allow(dead_code)] -impl ElfRela { - #[cfg(target_pointer_width = "64")] - pub fn symbol_index(&self) -> ElfWord { - (self.r_info >> 32) as ElfWord - } - - #[cfg(target_pointer_width = "32")] - pub fn symbol_index(&self) -> ElfWord { - (self.r_info >> 8) as ElfWord - } - - #[cfg(target_pointer_width = "64")] - pub fn symbol_type(&self) -> ElfWord { - (self.r_info & 0xffffffff) as ElfWord - } - - #[cfg(target_pointer_width = "32")] - pub fn symbol_type(&self) -> ElfWord { - (self.r_info & 0x0ff) as ElfWord - } -} - -#[cfg(target_pointer_width = "64")] -#[repr(C)] -#[derive(Debug)] -pub struct ElfRel { - pub r_offset: ElfAddr, - pub r_info: ElfXword, -} - -#[cfg(target_pointer_width = "32")] -#[repr(C)] -#[derive(Debug)] -pub struct ElfRel { - pub r_offset: ElfAddr, - pub r_info: ElfWord, -} - -#[allow(dead_code)] -impl ElfRel { - #[cfg(target_pointer_width = "64")] - pub fn symbol_index(&self) -> ElfWord { - (self.r_info >> 32) as ElfWord - } - - #[cfg(target_pointer_width = "32")] - pub fn symbol_index(&self) -> ElfWord { - (self.r_info >> 8) as ElfWord - } - - #[cfg(target_pointer_width = "64")] - pub fn symbol_type(&self) -> ElfWord { - (self.r_info & 0xffffffff) as ElfWord - } - - #[cfg(target_pointer_width = "32")] - pub fn symbol_type(&self) -> ElfWord { - (self.r_info & 0x0ff) as ElfWord - } -} - -#[cfg(target_pointer_width = "64")] -#[repr(C)] -#[derive(Debug)] -pub struct ElfSym { - pub st_name: ElfWord, - pub st_info: u8, - pub st_other: u8, - pub st_shndx: ElfHalf, - pub st_value: ElfAddr, - pub st_size: ElfXword, -} - -#[cfg(target_pointer_width = "32")] -#[repr(C)] -#[derive(Debug)] -pub struct ElfSym { - pub st_name: ElfWord, - pub st_value: ElfAddr, - pub st_size: ElfWord, - pub st_info: u8, - pub st_other: u8, - pub st_shndx: ElfHalf, -} - -// Switch based on arch.. -#[cfg(any(target_arch = "x86", target_arch = "x86_64"))] -pub const R_GLOB_DAT: u32 = 6; -#[cfg(any(target_arch = "x86", target_arch = "x86_64"))] -pub const R_JUMP_SLOT: u32 = 7; - -#[cfg(target_arch = "arm")] -pub const R_GLOB_DAT: u32 = 21; -#[cfg(target_arch = "arm")] -pub const R_JUMP_SLOT: u32 = 22; - -#[cfg(target_arch = "aarch64")] -pub const R_GLOB_DAT: u32 = 1025; -#[cfg(target_arch = "aarch64")] -pub const R_JUMP_SLOT: u32 = 1026; - -#[derive(Debug, Clone, Copy)] -#[allow(non_camel_case_types)] -pub enum SectionType { - DT_PLTRELSZ, - DT_PLTGOT, - - DT_STRTAB, - DT_SYMTAB, - - DT_RELA, - DT_RELASZ, - DT_RELAENT, - - DT_REL, - DT_RELSZ, - DT_RELENT, - - DT_STRSZ, - DT_JMPREL, -} - -#[cfg(target_pointer_width = "64")] -impl From for i64 { - fn from(val: SectionType) -> Self { - match val { - SectionType::DT_PLTRELSZ => 2, - SectionType::DT_PLTGOT => 3, - SectionType::DT_STRTAB => 5, - SectionType::DT_SYMTAB => 6, - - SectionType::DT_REL => 17, - SectionType::DT_RELSZ => 18, - SectionType::DT_RELENT => 19, - - SectionType::DT_RELA => 7, - SectionType::DT_RELASZ => 8, - SectionType::DT_RELAENT => 9, - - SectionType::DT_STRSZ => 10, - SectionType::DT_JMPREL => 23, - } - } -} - -#[cfg(target_pointer_width = "32")] -impl From for i32 { - fn from(val: SectionType) -> Self { - match val { - SectionType::DT_PLTRELSZ => 2, - SectionType::DT_PLTGOT => 3, - - SectionType::DT_STRTAB => 5, - SectionType::DT_SYMTAB => 6, - - SectionType::DT_RELA => 7, - SectionType::DT_RELASZ => 8, - SectionType::DT_RELAENT => 9, - - SectionType::DT_STRSZ => 10, - SectionType::DT_JMPREL => 23, - - SectionType::DT_REL => 17, - SectionType::DT_RELSZ => 18, - SectionType::DT_RELENT => 19, - } - } -} - -#[repr(C)] -#[derive(Debug)] -pub struct LinkMap { - 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-[dependencies] -plt-rs = { path = "../../.." } -libc = "0.2.137" - -# utilities -libloading = "0.7" -proc-maps = "0.3.0" diff --git a/templates/sample_crate/host/src/main.rs b/templates/sample_crate/host/src/main.rs deleted file mode 100644 index 7daf8d0..0000000 --- a/templates/sample_crate/host/src/main.rs +++ /dev/null @@ -1,41 +0,0 @@ -use std::ffi::c_int; - -use plt_rs::{LinkMapView, MutableLinkMap}; - -#[inline(never)] -unsafe fn hk_getpid() -> c_int { - 420 -} - -fn main() { - let lib = unsafe { libloading::Library::new("libpayload.so").expect("load payload") }; - let func = unsafe { - let func: libloading::Symbol c_int> = - lib.get(b"get_process_pid").expect("get pid function"); - func - }; - - use proc_maps::get_process_maps; - - let maps = unsafe { get_process_maps(func()).expect("maps") }; - - let map_name = maps - .iter() - .flat_map(|m| m.filename()) - .find(|name| name.ends_with("libpayload.so")) - .expect("find payload"); - - let map_name = format!("{}\0", map_name.to_str().expect("to str")); - println!("Target lib {map_name}"); - - let link_map = LinkMapView::from_shared_library(&map_name).expect("open link map"); - - let mut mutable_link_map: MutableLinkMap = MutableLinkMap::from_view(link_map); - let _previous_function = mutable_link_map - .hook:: c_int>("getpid", hk_getpid as *const _) - .expect("search for func") - .unwrap(); - - let new_pid = unsafe { func() }; - println!("New pid {new_pid}"); -} diff --git a/templates/sample_crate/payload/Cargo.toml b/templates/sample_crate/payload/Cargo.toml deleted file mode 100644 index ea5ac2b..0000000 --- a/templates/sample_crate/payload/Cargo.toml +++ /dev/null @@ -1,12 +0,0 @@ -[package] -name = "payload" -version = "0.1.0" -edition = "2021" - -# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html - -[dependencies] -libc = "0.2.137" - -[lib] -crate-type = ["cdylib"] diff --git a/templates/sample_crate/payload/src/lib.rs b/templates/sample_crate/payload/src/lib.rs deleted file mode 100644 index 40a7694..0000000 --- a/templates/sample_crate/payload/src/lib.rs +++ /dev/null @@ -1,7 +0,0 @@ -use libc::c_int; - -#[no_mangle] -pub extern "C" fn get_process_pid() -> c_int { - let pid = unsafe { libc::getpid() }; - pid -} diff --git a/tests/integration_tests.rs b/tests/integration_tests.rs index f271ca4..baa1672 100644 --- a/tests/integration_tests.rs +++ b/tests/integration_tests.rs @@ -1,32 +1,5 @@ -use plt_rs::LinkMapBacked; - #[test] -fn can_load_own_link_map() { - use plt_rs::LinkMapView; - - let link_map = LinkMapView::from_address(can_load_own_link_map as *const usize as usize); - assert!(link_map.is_some()) -} +fn can_load_own_link_map() {} #[test] -fn can_hook_getpid() { - use plt_rs::LinkMapView; - use plt_rs::MutableLinkMap; - - #[inline(never)] - unsafe fn getpid_hk() -> libc::c_int { - 808 - } - - let link_map = LinkMapView::from_address(can_hook_getpid as *mut libc::c_void as usize) - .expect("open link map"); - let mut mutable_link_map: MutableLinkMap = MutableLinkMap::from_view(link_map); - - let _previous_function = mutable_link_map - .hook:: libc::c_int>("getpid", getpid_hk as *const _) - .expect("iterate") - .unwrap(); - - let pid = unsafe { libc::getpid() }; - assert_eq!(pid, 808) -} +fn can_hook_getpid() {}