[Bug 2140] Capsicum support for FreeBSD 10 (-current)

bugzilla-daemon at mindrot.org bugzilla-daemon at mindrot.org
Thu Oct 10 11:24:47 EST 2013


https://bugzilla.mindrot.org/show_bug.cgi?id=2140

--- Comment #1 from Damien Miller <djm at mindrot.org> ---
Comment on attachment 2326
  --> https://bugzilla.mindrot.org/attachment.cgi?id=2326
openssh-capsicum

Looks good - a couple of small things.

>Index: sandbox-capsicum.c
>===================================================================
>RCS file: sandbox-capsicum.c
>diff -N sandbox-capsicum.c
>--- /dev/null	1 Jan 1970 00:00:00 -0000
>+++ sandbox-capsicum.c	7 Aug 2013 19:39:21 -0000
>@@ -0,0 +1,90 @@
>+

Please add a license block here.
http://www.openbsd.org/cgi-bin/cvsweb/src/share/misc/license.template?rev=1.3;content-type=text%2Fplain
is our preferred one.

>+/* Capsicum sandbox that sets zero nfiles, nprocs and filesize rlimits,
>+ * limits file descriptors on monitoring object,
>+ * and switches to capability mode
>+*/

Minor style nit. The first line of a multiline comment should be "/*"
by itself.
The last line's '*' should be aligned to the previous line's (i.e. add
a space at the start of the line).

>+struct ssh_sandbox {
>+	struct monitor *monitor;

This isn't used and can be removed.

>+extern struct monitor *pmonitor;

This can go too.

>+	box->monitor = pmonitor;

and this.


>+	if (cap_rights_limit(box->monitor->m_recvfd, CAP_READ | CAP_WRITE) == -1)
>+		fatal("%s: failed to limit the network socket", __func__);
>+	if (cap_rights_limit(box->monitor->m_log_sendfd, CAP_WRITE) == -1)
>+		fatal("%s: failed to limit the logging socket", __func__);

Are there any other fds open at this point? How about 0, 1 and 2 -
could they be limited?

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