[Bug 1666203] Re: pam_tty_audit failed in pam_open_session

[Seth Arnold]

Hello Don, probably an SRU sponsor would like the debdiff to include
references where to find the patch that you applied in upstream sources
or other bug reports. The usual way to do so is via a Description: and
Origin: header in the patch, see https://dep-
team.pages.debian.net/deps/dep3/ for more information.

Thanks

-- 
You received this bug notification because you are a member of Ubuntu
Sponsors Team, which is subscribed to the bug report.
https://bugs.launchpad.net/bugs/1666203

Title:
  pam_tty_audit failed in pam_open_session

Status in pam package in Ubuntu:
  Triaged
Status in pam package in Debian:
  New

Bug description:
  Dear Maintainer.

  I found a bug in pam_tty_audit.
  When Using the pam_tty_audit with other pam modules(ex, pam_ldap), it failed in pam_open_session.
  It was triggared by use uninitialized variable in pam_tty_audit.c::pam_open_session.

  * Enviroments
  Ubuntu 14.04.4 LTS
  linux-image-3.16.0-71-generic    3.16.0-71.92~14.04.1
  libpam-ldap:amd64    184-8.5ubuntu3
  libpam-modules:amd64    1.1.8-1ubuntu2.2

  Ubuntu 16.04.2 TLS
  linux-image-4.4.0-62-generic    4.4.0-62.83
  libpam-ldap:amd64    184-8.7ubuntu1
  libpam-modules:amd64    1.1.8-3.2ubuntu2

  * Reproduction method
  1. Install libpam-ldap.
  2. Add the following to the end of /etc/pam.d/common-sessions
  --------
  session required pam_tty_audit.so enable=* open_only
  --------
  3. When logging in with ssh etc., pam_tty_audit will fail and login fails

  * Solution (== 2018/04/16 Link updated ==)
  apply upstream patch
  https://github.com/linux-pam/linux-pam/commit/c5f829931a22c65feffee16570efdae036524bee

  * Logs (on Ubuntu14.04)
  -- auth.log --
  May 18 14:47:03 vm sshd[2272]: Accepted publickey for test from 10.99.0.1 port 51398 ssh2: RSA 8f:39:1c:3a:f4:9d:ca:99:67:fc:e3:fd:1e:0c:5b:a8
  May 18 14:47:03 vm sshd[2272]: pam_unix(sshd:session): session opened for user test by (uid=0)
  May 18 14:47:03 vm sshd[2272]: pam_tty_audit(sshd:session): error setting current audit status: Invalid argument
  May 18 14:47:03 vm sshd[2272]: error: PAM: pam_open_session(): Cannot make/remove an entry for the specified session
  May 18 14:47:03 vm sshd[2297]: Received disconnect from 10.99.0.1: 11: disconnected by user

  -- syslog --
  May 18 14:47:03 vm audispd: node=vm type=USER_ACCT msg=audit(1463550423.399:58): pid=2272 uid=0 auid=4294967295 ses=4294967295 msg='op=PAM:accounting acct="test" exe="/usr/sbin/sshd" hostname=10.99.0.1 addr=10.99.0.1 terminal=ssh res=success'
  May 18 14:47:03 vm audispd: node=vm type=CRED_ACQ msg=audit(1463550423.403:59): pid=2272 uid=0 auid=4294967295 ses=4294967295 msg='op=PAM:setcred acct="test" exe="/usr/sbin/sshd" hostname=10.99.0.1 addr=10.99.0.1 terminal=ssh res=success'
  May 18 14:47:03 vm audispd: node=vm type=LOGIN msg=audit(1463550423.403:60): pid=2272 uid=0 old-auid=4294967295 auid=20299 old-ses=4294967295 ses=3 res=1
  May 18 14:47:03 vm audispd: node=vm type=CONFIG_CHANGE msg=audit(1463550423.403:61): pid=2272 uid=0 auid=20299 ses=3 op=tty_set old-enabled=0 new-enabled=1 old-log_passwd=0 new-log_passwd=32743 res=0
  May 18 14:47:03 vm audispd: node=vm type=USER_START msg=audit(1463550423.447:62): pid=2272 uid=0 auid=20299 ses=3 msg='op=PAM:session_open acct="test" exe="/usr/sbin/sshd" hostname=10.99.0.1 addr=10.99.0.1 terminal=ssh res=failed'
  May 18 14:47:03 vm audispd: node=vm type=CRED_ACQ msg=audit(1463550423.447:63): pid=2297 uid=0 auid=20299 ses=3 msg='op=PAM:setcred acct="test" exe="/usr/sbin/sshd" hostname=10.99.0.1 addr=10.99.0.1 terminal=ssh res=success'
  May 18 14:47:03 vm audispd: node=vm type=CRED_DISP msg=audit(1463550423.451:64): pid=2272 uid=0 auid=20299 ses=3 msg='op=PAM:setcred acct="test" exe="/usr/sbin/sshd" hostname=10.99.0.1 addr=10.99.0.1 terminal=ssh res=success'

  Thanks regards.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/pam/+bug/1666203/+subscriptions