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tailscale/ssh
Andrew Dunham ccace1f7df ssh/tailssh: fix privilege dropping on FreeBSD; add tests
On FreeBSD and Darwin, changing a process's supplementary groups with
setgroups(2) will also change the egid of the process, setting it to the
first entry in the provided list. This is distinct from the behaviour on
other platforms (and possibly a violation of the POSIX standard).

Because of this, on FreeBSD with no TTY, our incubator code would
previously not change the process's gid, because it would read the
newly-changed egid, compare it against the expected egid, and since they
matched, not change the gid. Because we didn't use the 'login' program
on FreeBSD without a TTY, this would propagate to a child process.

This could be observed by running "id -p" in two contexts. The expected
output, and the output returned when running from a SSH shell, is:

    andrew@freebsd:~ $ id -p
    uid         andrew
    groups      andrew

However, when run via "ssh andrew@freebsd id -p", the output would be:

    $ ssh andrew@freebsd id -p
    login       root
    uid         andrew
    rgid        wheel
    groups      andrew

(this could also be observed via "id -g -r" to print just the gid)

We fix this by pulling the details of privilege dropping out into their
own function and prepending the expected gid to the start of the list on
Darwin and FreeBSD.

Finally, we add some tests that run a child process, drop privileges,
and assert that the final UID/GID/additional groups are what we expect.

More information can be found in the following article:
    https://www.usenix.org/system/files/login/articles/325-tsafrir.pdf

Updates #7616
Alternative to #7609

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: I0e6513c31b121108b50fe561c89e5816d84a45b9
2 years ago
..
tailssh ssh/tailssh: fix privilege dropping on FreeBSD; add tests 2 years ago