Fix sudo for procmgr

2025-04-20 16:20:56 +02:00
parent 803fd8870f
commit bfd521ff49
3 changed files with 96 additions and 25 deletions
@@ -113,6 +113,11 @@ name = "extra"
 version = "0.1.0"
 source = "git+https://gitlab.redox-os.org/redox-os/libextra.git#cf213969493db8667052a591e32a1e26d43c4234"

+[[package]]
+name = "generic-rt"
+version = "0.1.0"
+source = "git+https://gitlab.redox-os.org/redox-os/relibc#a30f13ee9b560f30cbfb41349b056d9b078862ef"
+
 [[package]]
 name = "getrandom"
 version = "0.2.15"
@@ -124,6 +129,17 @@ dependencies = [
 "wasi",
 ]

+[[package]]
+name = "goblin"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f27c1b4369c2cd341b5de549380158b105a04c331be5db9110eef7b6d2742134"
+dependencies = [
+ "log",
+ "plain",
+ "scroll",
+]
+
 [[package]]
 name = "hermit-abi"
 version = "0.1.19"
@@ -165,6 +181,12 @@ dependencies = [
 "redox_syscall",
 ]

+[[package]]
+name = "log"
+version = "0.4.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "13dc2df351e3202783a1fe0d44375f7295ffb4049267b0f3018346dc122a1d94"
+
 [[package]]
 name = "numtoa"
 version = "0.2.4"
@@ -183,6 +205,12 @@ dependencies = [
 "sdl2-sys",
 ]

+[[package]]
+name = "plain"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4596b6d070b27117e987119b4dac604f3c58cfb0b191112e24771b2faeac1a6"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.88"
@@ -211,6 +239,18 @@ dependencies = [
 "libredox",
 ]

+[[package]]
+name = "redox-rt"
+version = "0.1.0"
+source = "git+https://gitlab.redox-os.org/redox-os/relibc#a30f13ee9b560f30cbfb41349b056d9b078862ef"
+dependencies = [
+ "bitflags 2.6.0",
+ "generic-rt",
+ "goblin",
+ "plain",
+ "redox_syscall",
+]
+
 [[package]]
 name = "redox-scheme"
 version = "0.5.0"
@@ -247,8 +287,7 @@ dependencies = [
 [[package]]
 name = "redox_syscall"
 version = "0.5.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d2f103c6d277498fbceb16e84d317e2a400f160f46904d5f5410848c829511a3"
+source = "git+https://gitlab.redox-os.org/redox-os/syscall.git#8f646a63ac9c3aa532a37ddfdc136ec19878f0d6"
 dependencies = [
 "bitflags 2.6.0",
 ]
@@ -284,6 +323,26 @@ dependencies = [
 "crossbeam-utils",
 ]

+[[package]]
+name = "scroll"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "04c565b551bafbef4157586fa379538366e4385d42082f255bfd96e4fe8519da"
+dependencies = [
+ "scroll_derive",
+]
+
+[[package]]
+name = "scroll_derive"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1db149f81d46d2deba7cd3c50772474707729550221e69588478ebf9ada425ae"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "sdl2"
 version = "0.35.2"
@@ -395,7 +454,9 @@ dependencies = [
 "libc",
 "libredox",
 "orbclient",
+ "plain",
 "redox-daemon",
+ "redox-rt",
 "redox-scheme",
 "redox_event",
 "redox_liner",
@@ -55,6 +55,7 @@ path = "src/bin/usermod.rs"
 clap = "2.33.0"
 extra = { git = "https://gitlab.redox-os.org/redox-os/libextra.git" }
 orbclient = "0.3.47"
+plain = "0.2.3"
 redox-daemon = "0.1.3"
 redox_liner = "0.5.2"
 libc = "0.2.171"
@@ -66,5 +67,11 @@ redox_syscall = "0.5"
 redox_users = "0.4.6"
 termion = "4"

+[target.'cfg(target_os = "redox")'.dependencies]
+redox-rt = { git = "https://gitlab.redox-os.org/redox-os/relibc", default-features = false }
+
+[patch.crates-io]
+redox_syscall = { git = "https://gitlab.redox-os.org/redox-os/syscall.git" }
+
 [profile.release]
 lto = true
@@ -7,14 +7,16 @@ use std::process::{Command, exit};

 use extra::option::OptionalExt;
 use libredox::flag::O_CLOEXEC;
+use redox_rt::protocol::ProcCall;
+use redox_rt::sys::proc_call;
 use redox_scheme::scheme::SchemeSync;
 use redox_scheme::{
    CallerCtx, OpenResult, RequestKind, Response, SendFdRequest, SignalBehavior, Socket,
 };
 use redox_users::{All, AllGroups, AllUsers, Config, get_uid};
-use syscall::error::*;
 use syscall::flag::*;
 use syscall::schemev2::NewFdFlags;
+use syscall::{dup, error::*};
 use termion::input::TermRead;

 const MAX_ATTEMPTS: u16 = 3;
@@ -94,9 +96,13 @@ pub fn main() {
        }
    }

+    // FIXME move to libredox
+    unsafe extern "C" {
+        safe fn redox_cur_procfd_v0() -> usize;
+    }
+
    // Elevate privileges of our own process with help from the sudo daemon
-    let self_proc = syscall::open("/scheme/thisproc/current/open_via_dup", 0).unwrap();
-    syscall::sendfd(file, self_proc, 0, 0).unwrap();
+    syscall::sendfd(file, dup(redox_cur_procfd_v0(), &[]).unwrap(), 0, 0).unwrap();

    run_command_as_root(&cmd, &args.collect());
 }
@@ -220,28 +226,25 @@ impl Scheme {
        let handle = self.handles.get_mut(&req.id()).ok_or(Error::new(EBADF))?;
        match std::mem::replace(handle, Handle::Placeholder) {
            Handle::AwaitingContextFd => {
-                let mut context_file = usize::MAX;
-                req.obtain_fd(socket, FobtainFdFlags::empty(), Err(&mut context_file))?;
-                let context_file = unsafe { OwnedFd::from_raw_fd(context_file as RawFd) };
+                let mut proc_fd = usize::MAX;
+                req.obtain_fd(socket, FobtainFdFlags::empty(), Err(&mut proc_fd))?;
+                let proc_fd = unsafe { OwnedFd::from_raw_fd(proc_fd as RawFd) };

-                let context_uid_fd = unsafe {
-                    OwnedFd::from_raw_fd(
-                        syscall::dup(context_file.as_raw_fd() as usize, b"uid")? as RawFd
-                    )
-                };
-                let context_gid_fd = unsafe {
-                    OwnedFd::from_raw_fd(
-                        syscall::dup(context_file.as_raw_fd() as usize, b"gid")? as RawFd
-                    )
-                };
+                let [ruid, euid, suid] = [0, 0, 0];
+                let [rgid, egid, sgid] = [0, 0, 0];
+                let mut payload = [0; size_of::<u32>() * 6];
+                plain::slice_from_mut_bytes(&mut payload)
+                    .unwrap()
+                    .copy_from_slice(&[ruid, euid, suid, rgid, egid, sgid]);

-                // The caller was previously authenticated as member of the sudo group. Allow it to
-                // elevate privileges of a single process (likely itself).
-                syscall::write(context_uid_fd.as_raw_fd() as usize, b"0")
-                    .map_err(|_| Error::new(EIO))?;
-
-                syscall::write(context_gid_fd.as_raw_fd() as usize, b"0")
-                    .map_err(|_| Error::new(EIO))?;
+                if let Err(err) = proc_call(
+                    proc_fd.as_raw_fd() as usize,
+                    &mut payload,
+                    CallFlags::empty(),
+                    &[ProcCall::SetResugid as u64],
+                ) {
+                    eprintln!("failed to setresugid: {err}");
+                }
            }
            old => {
                *handle = old;