[][src]Crate unix_cred


unix-cred provides simple, cross-platform interfaces to read peer credentials from Unix sockets. (OS-specific interfaces are also exposed if the extra functionality is necessary).

Stream vs. Datagram sockets

Some platforms support reading peer credentials from datagram sockets using ancillary messages. Currently, unix-cred does not support this; only stream sockets are supported.

Which credentials am I getting?

On all currently supported platforms, both of the following are true:

  1. The UID and GID returned by these interfaces are the effective UID/GID, not the real or saved UID/GID.
  2. The credentials returned are cached at the time that the connect()/socketpair() call was made. (So if the process later drops privileges, or passes the file descriptor to an unprivileged process, it will still be shown as having elevated privileges.)

What are the other modules I see in this crate?

The ucred and xucred modules expose the OS-specific interfaces. ucred provides the Linux/OpenBSD/NetBSD interface, and xucred provides the macOS/FreeBSD/DragonFlyBSD interface.

ucred is not particularly useful; in most cases you should use get_peer_ids() or get_peer_pid_ids(), which are more cross-platform. However, xucred can be helpful since it provides access to the process's full supplementary group list.



The ucred module provides an interface to the ucred interface on Linux, the sockpeecred interface on OpenBSD, or the unpcbid interface on NetBSD.



Get the UID and GID of the given socket's peer.


Get the PID, UID, and GID of the given socket's peer.