Date: Sun, 13 Oct 2002 13:21:18 +1000 (EST) From: Edwin Groothuis <edwin@mavetju.org> To: FreeBSD-gnats-submit@FreeBSD.org Subject: bin/43994: sshd gives fatal while logging off Message-ID: <20021013032118.8AB716A712B@k7.mavetju>
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>Number: 43994
>Category: bin
>Synopsis: sshd gives fatal while logging off
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Oct 12 20:30:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Edwin Groothuis
>Release: FreeBSD 4.7-RELEASE i386
>Organization:
-
>Environment:
System: FreeBSD friet47.mavetju 4.7-RELEASE FreeBSD 4.7-RELEASE #0: Wed Oct 9 15:08:34 GMT 2002 root@builder.freebsdmall.com:/usr/obj/usr/src/sys/GENERIC i386
Running under VMWare. OS is straight out of the box, no modifications
regarding nything yet.
>Description:
When logging off I see this message coming up on the console:
Oct 12 16:32:43 friet47 sshd[122]: fatal: msg_send: write
Oct 12 16:32:55 friet47 sshd[7310]: fatal: msg_send: write
Running sshd in debug mode (triple -d) I get:
debug1: Received SIGCHLD.
debug2: notify_done: reading
debug1: End of interactive session; stdin 3, stdout (read 2037, sent 2037), stderr 0 bytes.
debug1: channel_free: channel 0: auth socket, nchannels 1
debug3: channel_free: status: The following connections are open:
debug3: channel_close_fds: channel 0: r 9 w 9 e -1
debug1: Command exited with status 1.
debug1: Received exit confirmation.
debug1: session_close: session 0 pid 9095
debug1: session_pty_cleanup: session 0 release /dev/ttyp0
debug1: restore_uid
Closing connection to 192.168.0.1
debug3: msg_send: type 7
msg_send: write
debug1: Calling cleanup 0x805ec88(0x0)
debug1: Calling cleanup 0x804d72c(0x0)
This is the write in msg.c line 43 (the first one). After some
debugging, it's caused by these lines:
static void *
pam_child(struct pam_ctxt *ctxt)
{
Buffer buffer;
struct pam_conv pam_conv = { pam_child_conv, ctxt };
pam_handle_t *pamh;
int pam_err;
buffer_init(&buffer);
setproctitle("%s [pam]", ctxt->pam_user);
pam_err = pam_start("sshd", ctxt->pam_user, &pam_conv, &pamh);
if (pam_err != PAM_SUCCESS)
goto auth_fail;
pam_err = pam_authenticate(pamh, 0);
[ pam_err is 19 here: PAM_CONV_ERR: Conversation error ]
if (pam_err != PAM_SUCCESS)
goto auth_fail;
pam_err = pam_acct_mgmt(pamh, 0);
>How-To-Repeat:
Install a clean 4.7-RELEASE, log in via ssh -1 and logoff. Check the console.
>Fix:
Beyond my capabilities.
Workaround are
- ignore it and loose some account management information.
- set ChallengeResponseAuthentication to no in /etc/ssh/sshd_config
>Release-Note:
>Audit-Trail:
>Unformatted:
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