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use cap_std::fs::{Dir, OpenOptions};
use pam::constants::{PamFlag, PamResultCode};
use pam::module::{PamHandle, PamHooks};
use std::ffi::CStr;
use std::io::{ErrorKind, Write};
use std::path::Path;
use std::process;
const CG_MOUNT: &str = "/sys/fs/cgroup";
struct PAMUserCG;
pam::pam_hooks!(PAMUserCG);
fn create_and_open_dir<P: AsRef<Path> + Copy>(
d: &Dir,
path: P,
) -> std::io::Result<Dir> {
match d.create_dir(path) {
Ok(()) => Ok(()),
Err(e) => match e.kind() {
ErrorKind::AlreadyExists => Ok(()),
_ => Err(e),
},
}?;
d.open_dir(path)
}
struct SessionError;
fn open_session(h: &mut PamHandle) -> Result<(), SessionError> {
let user = h.get_user(None).or(Err(SessionError))?;
let user = users::get_user_by_name(&user).ok_or(SessionError)?;
let aa = cap_std::ambient_authority();
let d = Dir::open_ambient_dir(CG_MOUNT, aa).or(Err(SessionError))?;
let d = create_and_open_dir(&d, "user").or(Err(SessionError))?;
let d = create_and_open_dir(&d, &user.uid().to_string())
.or(Err(SessionError))?;
let d = create_and_open_dir(&d, "leaf").or(Err(SessionError))?;
let pid = process::id().to_string();
let mut options = OpenOptions::new();
options.write(true);
let mut procs = d.open_with("cgroup.procs", &options).or(Err(SessionError))?;
procs.write_all(pid.as_bytes()).or(Err(SessionError))?;
Ok(())
}
impl PamHooks for PAMUserCG {
fn sm_open_session(
h: &mut PamHandle,
_args: Vec<&CStr>,
_flags: PamFlag,
) -> PamResultCode {
if open_session(h).is_ok() {
PamResultCode::PAM_SUCCESS
} else {
PamResultCode::PAM_SESSION_ERR
}
}
}
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