7c0a622d41
A rebuild's MetaSync resolves the head of the swarm's internal/meta once and records it; the prebuild and the swap build that flake instead of the hive's own, and a first deploy does the same in Create. hive-priv takes the commit as a validated meta_rev on UpdateContainer and CreateContainer and builds from its own forge URL (HIVE_PRIV_FORGE_URL). The head is used only when its flake lists the agent at the config commit the forge's main is at; otherwise, and when the repo has no commit or this hive has no core token file for nix's git, the hive renders locally as before. hive-c0re's and hive-priv's gitconfig now share the forge credential helper and rewrite the forge's https URLs to http, which hive-priv lacked.
564 lines
21 KiB
Rust
564 lines
21 KiB
Rust
//! Minimal privileged helper for hive-c0re.
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//!
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//! Runs as root. Exposes a narrow unix socket at `/run/hive/priv.sock`
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//! that accepts `PrivRequest` JSON lines and executes only the
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//! operations that genuinely require root. All coordination logic,
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//! broker, HTTP, and scheduling stay in the unprivileged hive-c0re
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//! process.
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//!
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//! **Security model**: every request is validated against a strict
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//! container-name allowlist before any filesystem or process operation.
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//! Only containers whose names match the hive convention (`h-*`,
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//! the manager container included) are accepted. Every variant maps to a single known operation — no
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//! arbitrary command pass-through.
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//!
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//! **Socket activation**: when systemd passes the listener socket via
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//! `LISTEN_FDS=1` + `LISTEN_PID=<self>`, the inherited fd 3 is used
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//! instead of binding a fresh socket.
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//!
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//! **Layout**: this file holds the socket loop and the one-arm-per-op
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//! dispatch table. Each op family's handlers and validation live in their
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//! own module: [`container`] (lifecycle), [`container_config`] (nspawn flags,
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//! systemd drop-ins), [`storage`] (btrfs subvolumes, quotas, snapshots, disk
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//! measurement), [`files`] (pause marker, socket dir, legacy tmpfiles) and
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//! [`infra`] (gateway nginx, forge admin, infra containers). Helpers more than
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//! one family uses are in [`shared`].
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mod container;
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mod container_config;
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mod files;
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mod infra;
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mod shared;
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mod storage;
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use std::os::fd::{AsRawFd as _, FromRawFd as _, OwnedFd, RawFd};
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use anyhow::{Context as _, Result, bail};
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use hive_priv_sock::{PRIV_SOCK, PrivEvent, PrivRequest, PrivResponse};
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use tokio::io::AsyncWriteExt;
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use tokio::net::unix::OwnedWriteHalf;
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use tokio::net::{UnixListener, UnixStream};
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#[tokio::main]
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async fn main() -> Result<()> {
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tracing_subscriber::fmt()
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.with_env_filter(
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tracing_subscriber::EnvFilter::try_from_default_env().unwrap_or_else(|_| "info".into()),
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)
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// This is a systemd-managed daemon — stdout always goes to journald,
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// never a human terminal, and journald doesn't strip ANSI escapes:
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// they land in victorialogs as raw byte-array spam otherwise.
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.with_ansi(false)
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.init();
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let listener = socket_listener()?;
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if let Err(e) = files::remove_legacy_tmpfiles() {
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tracing::warn!(error = %format!("{e:#}"), "legacy tmpfiles cleanup failed");
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}
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tracing::info!("hive-priv listening");
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loop {
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match listener.accept().await {
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Ok((stream, _)) => {
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tokio::spawn(handle(stream));
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}
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Err(e) => {
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tracing::error!(error = %e, "accept failed");
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}
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}
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}
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}
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fn socket_listener() -> Result<UnixListener> {
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// hive-priv is ALWAYS socket-activated by the `hive-priv.socket` unit
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// (fd 3 via LISTEN_FDS). There is intentionally no self-bind fallback,
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// so dev and prod take the same path; see docs/trust-boundary/boundary.md.
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let listen_fds: Option<i32> = std::env::var("LISTEN_FDS")
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.ok()
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.and_then(|s| s.parse().ok());
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let listen_pid: Option<u32> = std::env::var("LISTEN_PID")
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.ok()
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.and_then(|s| s.parse().ok());
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let activated =
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matches!(listen_fds, Some(n) if n >= 1) && listen_pid == Some(std::process::id());
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if !activated {
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bail!(
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"hive-priv requires systemd socket activation (expected LISTEN_FDS>=1 + \
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LISTEN_PID=<self> for {PRIV_SOCK}); run it via the hive-priv.socket unit, \
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not directly"
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);
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}
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// SAFETY: systemd has passed us a ready UnixListener on fd 3.
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let std_listener = unsafe {
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use std::os::unix::io::FromRawFd;
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std::os::unix::net::UnixListener::from_raw_fd(3)
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};
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std_listener
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.set_nonblocking(true)
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.context("set socket non-blocking")?;
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let listener =
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tokio::net::UnixListener::from_std(std_listener).context("wrap systemd socket")?;
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tracing::info!("using systemd-activated socket");
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Ok(listener)
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}
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/// Ancillary-data buffer sized and aligned for one `SCM_RIGHTS` message.
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///
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/// `CMSG_SPACE` is not a `const fn`, so the size is a literal with room
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/// to spare (24 bytes are needed for a single descriptor on x86-64). The
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/// union member gives the `cmsghdr` alignment `CMSG_FIRSTHDR` requires —
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/// a bare `[u8; N]` is only byte-aligned and would be undefined behaviour
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/// to walk.
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#[repr(C)]
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union CmsgSpace {
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_align: libc::cmsghdr,
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bytes: [u8; 32],
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}
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/// One `recvmsg` into `buf`, returning the bytes read plus any file
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/// descriptors that rode along as `SCM_RIGHTS`.
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///
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/// Why not a plain read: ancillary data is attached to a *specific*
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/// `recvmsg` call, so a buffered line reader cannot surface it — it
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/// reads the bytes and silently drops the descriptor.
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///
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/// `MSG_CMSG_CLOEXEC` is not optional: without it a received descriptor
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/// is inherited by every `btrfs` / `nixos-container` child this helper
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/// later spawns.
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fn recv_with_fds(sock: RawFd, buf: &mut [u8]) -> std::io::Result<(usize, Vec<OwnedFd>)> {
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const FD_SIZE: usize = std::mem::size_of::<RawFd>();
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let mut iov = libc::iovec {
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iov_base: buf.as_mut_ptr().cast(),
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iov_len: buf.len(),
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};
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let mut cmsg = CmsgSpace { bytes: [0; 32] };
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// SAFETY: msghdr is a plain C struct with no invalid bit patterns;
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// every field we care about is set immediately below.
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let mut msg: libc::msghdr = unsafe { std::mem::zeroed() };
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msg.msg_iov = &raw mut iov;
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msg.msg_iovlen = 1;
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msg.msg_control = std::ptr::addr_of_mut!(cmsg.bytes).cast();
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msg.msg_controllen = 32;
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// SAFETY: `msg` points at a live iovec covering `buf` and a live,
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// correctly aligned control buffer of the length we just declared.
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let n = unsafe { libc::recvmsg(sock, &raw mut msg, libc::MSG_CMSG_CLOEXEC) };
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if n < 0 {
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return Err(std::io::Error::last_os_error());
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}
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// Take ownership of every descriptor the kernel attached, even ones
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// this protocol never expects: an `OwnedFd` we drop is closed, an
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// fd we fail to claim is leaked for the lifetime of the process.
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let mut fds = Vec::new();
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// SAFETY: `msg` was just filled in by a successful `recvmsg`.
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let mut cmsgp = unsafe { libc::CMSG_FIRSTHDR(&raw const msg) };
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while !cmsgp.is_null() {
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// SAFETY: CMSG_FIRSTHDR / CMSG_NXTHDR only ever return a pointer
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// to a complete header inside the control buffer.
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let hdr = unsafe { std::ptr::read_unaligned(cmsgp) };
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if hdr.cmsg_level == libc::SOL_SOCKET && hdr.cmsg_type == libc::SCM_RIGHTS {
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// SAFETY: same, and CMSG_LEN(0) is the header's own length.
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let payload = hdr.cmsg_len as usize - unsafe { libc::CMSG_LEN(0) } as usize;
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let count = payload / FD_SIZE;
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// SAFETY: CMSG_DATA points at `payload` bytes of descriptors.
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let data = unsafe { libc::CMSG_DATA(cmsgp) };
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for i in 0..count {
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// Copied out byte-wise rather than read through a
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// `*const RawFd`: the control buffer is only guaranteed
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// `cmsghdr`-aligned, so casting to a more strictly
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// aligned pointer would be unsound even where it happens
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// to work.
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let mut raw = [0u8; FD_SIZE];
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// SAFETY: i < count, so this reads inside the payload.
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unsafe {
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std::ptr::copy_nonoverlapping(data.add(i * FD_SIZE), raw.as_mut_ptr(), FD_SIZE);
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}
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// SAFETY: the kernel just created this descriptor for
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// us — we are its only owner.
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fds.push(unsafe { OwnedFd::from_raw_fd(RawFd::from_ne_bytes(raw)) });
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}
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}
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// SAFETY: `cmsgp` came from this same message.
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cmsgp = unsafe { libc::CMSG_NXTHDR(&raw const msg, cmsgp) };
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}
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// `n >= 0` was checked above, so the conversion cannot fail; going
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// through `try_from` keeps it a cast-free, lint-clean widening.
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let read = usize::try_from(n).unwrap_or_default();
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Ok((read, fds))
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}
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/// Reads newline-delimited requests off one connection, pairing each
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/// with the descriptor that arrived with it.
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///
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/// The pairing is deliberately trivial, because the protocol is:
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/// `hive-sock-client` connects per request, so a connection carries one
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/// line and at most one descriptor. The loop below still handles several
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/// sequential requests (the server always has), but it refuses to guess
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/// — a second descriptor arriving before its line is a protocol error,
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/// not something to queue and hope about.
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struct Requests<'a> {
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sock: &'a UnixStream,
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buf: Vec<u8>,
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fd: Option<OwnedFd>,
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}
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impl Requests<'_> {
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/// Next complete request line and its descriptor, or `None` at EOF.
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async fn next(&mut self) -> Result<Option<(String, Option<OwnedFd>)>> {
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loop {
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if let Some(nl) = self.buf.iter().position(|&b| b == b'\n') {
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let line: Vec<u8> = self.buf.drain(..=nl).take(nl).collect();
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let line = String::from_utf8(line).context("request line was not valid UTF-8")?;
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return Ok(Some((line, self.fd.take())));
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}
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let mut chunk = [0u8; 8192];
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let raw = self.sock.as_raw_fd();
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let (n, fds) = self
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.sock
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.async_io(tokio::io::Interest::READABLE, || {
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recv_with_fds(raw, &mut chunk)
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})
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.await
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.context("recvmsg on the priv socket")?;
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for fd in fds {
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if self.fd.replace(fd).is_some() {
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bail!("more than one file descriptor passed for a single request");
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}
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}
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if n == 0 {
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if !self.buf.is_empty() {
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bail!("connection closed mid-request ({} bytes)", self.buf.len());
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}
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return Ok(None);
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}
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self.buf.extend_from_slice(&chunk[..n]);
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}
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}
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}
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async fn handle(stream: UnixStream) {
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let (reader, mut writer) = stream.into_split();
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let mut requests = Requests {
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sock: reader.as_ref(),
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buf: Vec::new(),
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fd: None,
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};
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loop {
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let (line, fd) = match requests.next().await {
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Ok(Some(req)) => req,
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Ok(None) => break,
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Err(e) => {
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tracing::warn!(error = %format!("{e:#}"), "reading request failed");
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break;
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}
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};
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let resp = dispatch(&line, fd, &mut writer).await;
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// Write the terminal PrivResponse as a PrivEvent::Done. Wire-identical
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// to a bare PrivResponse (untagged), so old hive-c0re callers that
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// deserialise directly to PrivResponse continue to work.
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let event = PrivEvent::Done(resp);
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let mut json = serde_json::to_string(&event).unwrap_or_else(|e| {
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format!("{{\"ok\":false,\"stdout\":\"\",\"stderr\":\"\",\"error\":\"serialise failed: {e}\"}}")
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});
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json.push('\n');
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if let Err(e) = writer.write_all(json.as_bytes()).await {
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tracing::warn!(error = %e, "write response failed");
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break;
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}
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}
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}
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/// Reject a request whose descriptor and operation disagree, in either
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/// direction.
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///
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/// No guessing when the caller didn't say: an op that streams into a
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/// passed descriptor cannot invent one, and an op that takes none must
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/// not silently accept one. Returning the `Err` here drops the
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/// `OwnedFd`, which closes it.
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fn check_fd_agreement(req: &PrivRequest, fd: Option<&OwnedFd>) -> Result<()> {
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let wants_fd = matches!(req, PrivRequest::SendAgentSnapshotToFd { .. });
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match (wants_fd, fd.is_some()) {
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(true, false) => bail!("this operation requires a passed file descriptor, none arrived"),
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(false, true) => bail!("this operation does not take a passed file descriptor"),
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_ => Ok(()),
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}
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}
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async fn dispatch(line: &str, fd: Option<OwnedFd>, writer: &mut OwnedWriteHalf) -> PrivResponse {
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match run(line, fd, writer).await {
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Ok((stdout, stderr)) => PrivResponse {
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ok: true,
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stdout,
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stderr,
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error: None,
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},
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Err(e) => PrivResponse {
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ok: false,
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stdout: String::new(),
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stderr: String::new(),
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error: Some(format!("{e:#}")),
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},
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}
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}
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/// Parse one request line, check it agrees with the descriptor that
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/// arrived with it, and execute it.
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///
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/// Split out of [`dispatch`] so the three failure modes collapse into one
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/// `Result` instead of three nested matches building the same struct.
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async fn run(
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line: &str,
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fd: Option<OwnedFd>,
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writer: &mut OwnedWriteHalf,
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) -> Result<(String, String)> {
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let req = serde_json::from_str::<PrivRequest>(line).context("parse request")?;
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check_fd_agreement(&req, fd.as_ref())?;
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exec(req, fd, writer).await
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}
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/// Execute a validated `PrivRequest`. Returns `(stdout, stderr)` on success.
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/// For streaming ops (`CreateContainer`/`UpdateContainer` with `stream: true`)
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/// output lines are forwarded to `writer` as `PrivEvent::Line` messages and
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/// the returned strings are empty.
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///
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/// `fd` is the descriptor that arrived with this request, already checked
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/// against the operation by [`check_fd_agreement`]: `Some` exactly for
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/// the variants that stream into a caller-supplied descriptor, `None`
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/// for every other operation.
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// One match arm per priv op — a flat 1:1 dispatch table. Every arm either
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// delegates directly or validates then delegates; an op whose handling is
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// more than that gets its own named function instead, so the match's length
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// tracks the op count, not complexity.
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#[allow(clippy::too_many_lines)]
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async fn exec(
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req: PrivRequest,
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fd: Option<OwnedFd>,
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writer: &mut OwnedWriteHalf,
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) -> Result<(String, String)> {
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match req {
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PrivRequest::StartContainer { ref name } => container::start_container(name).await,
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PrivRequest::StopContainer { ref name } => container::stop_container(name).await,
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PrivRequest::KillContainer { ref name } => container::kill_container(name).await,
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PrivRequest::UpdateContainer {
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ref name,
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stream,
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ref meta_rev,
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} => {
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container::container_flake_action("update", name, meta_rev.as_deref(), stream, writer)
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.await
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}
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PrivRequest::CreateContainer {
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ref name,
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stream,
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ref meta_rev,
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} => {
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container::container_flake_action("create", name, meta_rev.as_deref(), stream, writer)
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.await
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}
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PrivRequest::DestroyContainer { ref name } => container::destroy_container(name).await,
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PrivRequest::ListContainers => container::container_run(&["list"]).await,
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PrivRequest::WriteNspawnFlags {
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ref container,
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ref binds,
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ref isolation,
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ref load_credentials,
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ref hive_facts,
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} => container_config::handle_write_nspawn_flags(
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container,
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binds,
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isolation,
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load_credentials,
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hive_facts,
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),
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PrivRequest::EnsureAgentSocketDir { ref name } => files::ensure_agent_socket_dir(name),
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PrivRequest::WriteResourceLimits {
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ref container,
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ref memory_max,
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ref cpu_quota,
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cpu_weight,
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io_weight,
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} => container_config::write_resource_limits(
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container, memory_max, cpu_quota, cpu_weight, io_weight,
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),
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PrivRequest::RemoveServiceDropin { ref container } => {
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container_config::remove_service_dropin(container)
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}
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PrivRequest::DaemonReload => container_config::daemon_reload().await,
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PrivRequest::ReloadGatewayNginx => infra::sync_gateway_nginx().await,
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PrivRequest::RunForgeAdmin { ref args } => infra::exec_forge_admin(args).await,
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PrivRequest::SetAgentPaused {
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ref agent_name,
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paused,
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} => files::exec_set_agent_paused(agent_name, paused),
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PrivRequest::ControlInfraContainer { container, action } => {
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infra::control_infra_container(container, action).await
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}
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PrivRequest::EnsureAgentSubvolume { ref agent_name } => {
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storage::exec_ensure_agent_subvolume(agent_name).await
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}
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PrivRequest::DeleteAgentSubvolume { ref agent_name } => {
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storage::exec_delete_agent_subvolume(agent_name).await
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}
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PrivRequest::EnsureBtrfsQuota => storage::ensure_btrfs_quota().await,
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PrivRequest::ReadSubvolumeUsage { ref agent_name } => {
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storage::exec_read_subvolume_usage(agent_name).await
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}
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PrivRequest::SetSubvolumeQuota {
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ref agent_name,
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limit_bytes,
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} => storage::exec_set_subvolume_quota(agent_name, limit_bytes).await,
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PrivRequest::MeasureAgentDisk { ref agent_name } => {
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storage::exec_measure_agent_disk(agent_name).await
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}
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PrivRequest::UpgradeAgentSubvolume { ref agent_name } => {
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storage::exec_upgrade_agent_subvolume(agent_name).await
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}
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PrivRequest::SnapshotAgentSubvolume {
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ref agent_name,
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ref snapshot_name,
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} => storage::exec_snapshot_agent_subvolume(agent_name, snapshot_name).await,
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PrivRequest::DeleteAgentSnapshot {
|
|
ref agent_name,
|
|
ref snapshot_name,
|
|
} => storage::exec_delete_agent_snapshot(agent_name, snapshot_name).await,
|
|
|
|
PrivRequest::SendAgentSnapshotToFile {
|
|
ref agent_name,
|
|
ref snapshot_name,
|
|
ref parent_snapshot_name,
|
|
ref dest_file_name,
|
|
} => {
|
|
storage::exec_send_agent_snapshot_to_file(
|
|
agent_name,
|
|
snapshot_name,
|
|
parent_snapshot_name.as_deref(),
|
|
dest_file_name,
|
|
)
|
|
.await
|
|
}
|
|
|
|
PrivRequest::SendAgentSnapshotToFd {
|
|
ref agent_name,
|
|
ref snapshot_name,
|
|
ref parent_snapshot_name,
|
|
} => {
|
|
storage::exec_send_agent_snapshot_to_fd(
|
|
agent_name,
|
|
snapshot_name,
|
|
parent_snapshot_name.as_deref(),
|
|
fd,
|
|
)
|
|
.await
|
|
}
|
|
|
|
PrivRequest::SyncAgentTmpfiles => {
|
|
files::remove_legacy_tmpfiles()?;
|
|
Ok((String::new(), String::new()))
|
|
}
|
|
}
|
|
}
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::{OwnedFd, PrivRequest, check_fd_agreement};
|
|
|
|
/// A request that streams into a caller-supplied descriptor.
|
|
fn fd_taking_request() -> PrivRequest {
|
|
PrivRequest::SendAgentSnapshotToFd {
|
|
agent_name: "atlas".to_owned(),
|
|
snapshot_name: "hive-migrate".to_owned(),
|
|
parent_snapshot_name: None,
|
|
}
|
|
}
|
|
|
|
/// A real descriptor — `/dev/null` rather than a fake, so the drop
|
|
/// that closes it on a rejection path is genuinely exercised.
|
|
fn some_fd() -> OwnedFd {
|
|
std::fs::File::open("/dev/null")
|
|
.expect("open /dev/null")
|
|
.into()
|
|
}
|
|
|
|
/// An op that streams into a passed descriptor cannot invent one:
|
|
/// falling back to anything (a temp file, the response socket) would
|
|
/// send an agent's state somewhere the caller never asked for.
|
|
#[test]
|
|
fn an_fd_taking_op_without_a_descriptor_is_rejected() {
|
|
let err = check_fd_agreement(&fd_taking_request(), None)
|
|
.expect_err("no descriptor arrived, so this must not proceed");
|
|
let msg = format!("{err:#}");
|
|
assert!(msg.contains("requires a passed file descriptor"), "{msg}");
|
|
}
|
|
|
|
/// The mirror case: a descriptor sent alongside an op that takes
|
|
/// none is a protocol error, not something to ignore. Returning the
|
|
/// error drops the `OwnedFd`, which closes it — the alternative
|
|
/// leaks one descriptor per stray request in a long-lived root
|
|
/// process.
|
|
#[test]
|
|
fn a_descriptor_sent_to_an_op_that_takes_none_is_rejected() {
|
|
let fd = some_fd();
|
|
let err = check_fd_agreement(&PrivRequest::DaemonReload, Some(&fd))
|
|
.expect_err("an unexpected descriptor must not be silently ignored");
|
|
let msg = format!("{err:#}");
|
|
assert!(
|
|
msg.contains("does not take a passed file descriptor"),
|
|
"{msg}"
|
|
);
|
|
}
|
|
|
|
/// Both agreeing combinations pass, so the check rejects mismatches
|
|
/// rather than descriptors in general.
|
|
#[test]
|
|
fn agreeing_combinations_are_accepted() {
|
|
let fd = some_fd();
|
|
check_fd_agreement(&fd_taking_request(), Some(&fd))
|
|
.expect("an fd-taking op with its descriptor is the normal case");
|
|
check_fd_agreement(&PrivRequest::DaemonReload, None)
|
|
.expect("every ordinary request arrives without a descriptor");
|
|
}
|
|
|
|
/// An older hive-c0re's `SyncAgentTmpfiles` still decodes, payload and
|
|
/// all, so it gets the legacy cleanup rather than a parse error. Control:
|
|
/// an unknown op does not decode.
|
|
#[test]
|
|
fn legacy_sync_agent_tmpfiles_request_still_decodes() {
|
|
let legacy =
|
|
r#"{"op":"sync_agent_tmpfiles","agents":[{"name":"atlas","uid":1000,"gid":994}]}"#;
|
|
assert!(matches!(
|
|
serde_json::from_str::<PrivRequest>(legacy),
|
|
Ok(PrivRequest::SyncAgentTmpfiles)
|
|
));
|
|
assert!(serde_json::from_str::<PrivRequest>(r#"{"op":"sync_agent_tmpfilez"}"#).is_err());
|
|
}
|
|
}
|