Package: openssh-server Version: 1:5.5p1-6 Severity: normal
Normally the Kerberos credential cache is cleaned up after a user logs out and the SSH session closes. My assumption is that this behaviour is caused by the settings in /etc/ssh/sshd_config below: KerberosTicketCleanup yes GSSAPICleanupCredentials yes However, I found a case in which the credential cache is NOT cleaned up. This happens when a user successfully authenticates with Kerberos/GSSAPI, but authorisation fails while processing PAM account settings. This is what happens on the client: $ ssh user@host user@host's password: LDAP authorisation check failed Connection closed by 10.0.10.10 On the server you'll see a credential cache file that has been created: # ls -l /tmp/*1400400* -rw------- 1 user user 507 Feb 8 10:40 krb5cc_1400400_wGxWcnG143 But it will never be removed... Conclusion: clean up of credential caches works, but not in case PAM account fails. I don't know whether this is an upstream issue. I couldn't find any configuration settings I'm missing. My guess is that sshd doesn't know about the failed authorisation by PAM and thus doesn't invoke the clean up process. Remember that the authentication that happens on SSH-level WAS successful, which might sshd letting think that it's a successful login, so no clean up needed. Thanks for looking at this issue. -- System Information: Debian Release: 6.0 APT prefers squeeze-updates APT policy: (500, 'squeeze-updates'), (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 2.6.32-5-amd64 (SMP w/1 CPU core) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Versions of packages openssh-server depends on: ii adduser 3.112+nmu2 add and remove users and groups ii debconf [debconf-2.0] 1.5.36.1 Debian configuration management sy ii dpkg 1.15.8.9 Debian package management system ii libc6 2.11.2-10 Embedded GNU C Library: Shared lib ii libcomerr2 1.41.12-2 common error description library ii libgssapi-krb5-2 1.8.3+dfsg-4 MIT Kerberos runtime libraries - k ii libkrb5-3 1.8.3+dfsg-4 MIT Kerberos runtime libraries ii libpam-modules 1.1.1-6.1 Pluggable Authentication Modules f ii libpam-runtime 1.1.1-6.1 Runtime support for the PAM librar ii libpam0g 1.1.1-6.1 Pluggable Authentication Modules l ii libselinux1 2.0.96-1 SELinux runtime shared libraries ii libssl0.9.8 0.9.8o-4 SSL shared libraries ii libwrap0 7.6.q-19 Wietse Venema's TCP wrappers libra ii lsb-base 3.2-23.2squeeze1 Linux Standard Base 3.2 init scrip ii openssh-blacklist 0.4.1 list of default blacklisted OpenSS ii openssh-client 1:5.5p1-6 secure shell (SSH) client, for sec ii procps 1:3.2.8-9 /proc file system utilities ii zlib1g 1:1.2.3.4.dfsg-3 compression library - runtime Versions of packages openssh-server recommends: pn openssh-blacklist-extra <none> (no description available) pn xauth <none> (no description available) Versions of packages openssh-server suggests: pn molly-guard <none> (no description available) pn rssh <none> (no description available) pn ssh-askpass <none> (no description available) pn ufw <none> (no description available) -- debconf information: * ssh/use_old_init_script: true ssh/vulnerable_host_keys: ssh/encrypted_host_key_but_no_keygen: ssh/disable_cr_auth: false -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
