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|
use libc::{gid_t, uid_t};
/// Credentials of a process
#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
pub struct UCred {
/// UID (user ID) of the process
uid: uid_t,
/// GID (group ID) of the process
gid: gid_t,
}
impl UCred {
/// Gets UID (user ID) of the process.
pub fn uid(&self) -> uid_t {
self.uid
}
/// Gets GID (group ID) of the process.
pub fn gid(&self) -> gid_t {
self.gid
}
}
#[cfg(any(target_os = "linux", target_os = "android"))]
pub(crate) use self::impl_linux::get_peer_cred;
#[cfg(any(
target_os = "dragonfly",
target_os = "macos",
target_os = "ios",
target_os = "freebsd",
target_os = "netbsd",
target_os = "openbsd"
))]
pub(crate) use self::impl_macos::get_peer_cred;
#[cfg(any(target_os = "solaris", target_os = "illumos"))]
pub(crate) use self::impl_solaris::get_peer_cred;
#[cfg(any(target_os = "linux", target_os = "android"))]
pub(crate) mod impl_linux {
use crate::net::unix::UnixStream;
use libc::{c_void, getsockopt, socklen_t, SOL_SOCKET, SO_PEERCRED};
use std::{io, mem};
use libc::ucred;
pub(crate) fn get_peer_cred(sock: &UnixStream) -> io::Result<super::UCred> {
use std::os::unix::io::AsRawFd;
unsafe {
let raw_fd = sock.as_raw_fd();
let mut ucred = ucred {
pid: 0,
uid: 0,
gid: 0,
};
let ucred_size = mem::size_of::<ucred>();
// These paranoid checks should be optimized-out
assert!(mem::size_of::<u32>() <= mem::size_of::<usize>());
assert!(ucred_size <= u32::max_value() as usize);
let mut ucred_size = ucred_size as socklen_t;
let ret = getsockopt(
raw_fd,
SOL_SOCKET,
SO_PEERCRED,
&mut ucred as *mut ucred as *mut c_void,
&mut ucred_size,
);
if ret == 0 && ucred_size as usize == mem::size_of::<ucred>() {
Ok(super::UCred {
uid: ucred.uid,
gid: ucred.gid,
})
} else {
Err(io::Error::last_os_error())
}
}
}
}
#[cfg(any(
target_os = "dragonfly",
target_os = "macos",
target_os = "ios",
target_os = "freebsd",
target_os = "netbsd",
target_os = "openbsd"
))]
pub(crate) mod impl_macos {
use crate::net::unix::UnixStream;
use libc::getpeereid;
use std::io;
use std::mem::MaybeUninit;
use std::os::unix::io::AsRawFd;
pub(crate) fn get_peer_cred(sock: &UnixStream) -> io::Result<super::UCred> {
unsafe {
let raw_fd = sock.as_raw_fd();
let mut uid = MaybeUninit::uninit();
let mut gid = MaybeUninit::uninit();
let ret = getpeereid(raw_fd, uid.as_mut_ptr(), gid.as_mut_ptr());
if ret == 0 {
Ok(super::UCred {
uid: uid.assume_init(),
gid: gid.assume_init(),
})
} else {
Err(io::Error::last_os_error())
}
}
}
}
#[cfg(any(target_os = "solaris", target_os = "illumos"))]
pub(crate) mod impl_solaris {
use crate::net::unix::UnixStream;
use std::io;
use std::os::unix::io::AsRawFd;
use std::ptr;
#[allow(non_camel_case_types)]
enum ucred_t {}
extern "C" {
fn ucred_free(cred: *mut ucred_t);
fn ucred_geteuid(cred: *const ucred_t) -> super::uid_t;
fn ucred_getegid(cred: *const ucred_t) -> super::gid_t;
fn getpeerucred(fd: std::os::raw::c_int, cred: *mut *mut ucred_t) -> std::os::raw::c_int;
}
pub(crate) fn get_peer_cred(sock: &UnixStream) -> io::Result<super::UCred> {
unsafe {
let raw_fd = sock.as_raw_fd();
let mut cred = ptr::null_mut::<*mut ucred_t>() as *mut ucred_t;
let ret = getpeerucred(raw_fd, &mut cred);
if ret == 0 {
let uid = ucred_geteuid(cred);
let gid = ucred_getegid(cred);
ucred_free(cred);
Ok(super::UCred { uid, gid })
} else {
Err(io::Error::last_os_error())
}
}
}
}
|
