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Date:      Sun, 3 Nov 2002 20:49:02 +0100
From:      Alexander Leidinger <Alexander@Leidinger.net>
To:        current@freebsd.org
Cc:        markus@openbsd.org, des@freebsd.org
Subject:   ssh-agent broken with pam_ssh for xdm (+ fix for ssh-agent.c)
Message-ID:  <20021103204902.3c6b3705.Alexander@Leidinger.net>

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Hi,

[Markus: this is on FreeBSD-current with
$OpenBSD: ssh-agent.c,v 1.105 2002/10/01 20:34:12 markus Exp $]

I use pam_ssh in pam.d/xdm and after an update to todays -current, it
doesn't add my key anymore. In /var/log/messages I see the following if
I try a "ssh-add -l":
---snip---
ssh-agent[6438]: error: uid mismatch: peer euid 1000 != uid 0
---snip---

ssh-agent.c:after_select() contains:
---snip---
                                if ((euid != 0) && (getuid() != euid)) {
                                        error("uid mismatch: "
                                            "peer euid %u != uid %u",
                                            (u_int) euid, (u_int) getuid());
                                        close(sock);
                                        break;
                                }
---snip---

As ssh_agent gets startet from pam_ssh in xdm (which runs as root ->
getuid() = 0, geteuid() = 1000), it is obvious why it doesn't work.

At the moment I have this piece of code commented out, but I think this
should get changed to use geteuid() instead of getuid(). Or did I
misunderstood the idea behind the above code?

Bye,
Alexander.

-- 
                      Loose bits sink chips.

http://www.Leidinger.net                       Alexander @ Leidinger.net
  GPG fingerprint = C518 BC70 E67F 143F BE91  3365 79E2 9C60 B006 3FE7

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