** Description changed: - On Karmic (alpha 4 plus updates), changing the nsswitch.conf 'passwd' - field to anything with 'ldap' as the first item breaks the ability to - become root using 'su' and 'sudo' as anyone but root. + SRU Request: + + [Impact] + As heavily outlined in the amount of comments in this bug the impact is detrimental to both community and enterprise users alike. + + [Development Fix] + Howard Chu released a patch in #73 which was later confirmed in #106 & #108 as a resolution. The patch has since then made its way into the latest development tree. + + [Stable Fix] + Patch from #73 can be applied cleanly to Lucid and new distributions. + + [Test Case] + On Karmic (alpha 4 plus updates), changing the nsswitch.conf 'passwd' field to anything with 'ldap' as the first item breaks the ability to become root using 'su' and 'sudo' as anyone but root. Default nsswitch.conf: passwd: compat group: compat shadow: compat matt@box:~$ sudo uname -a [sudo] password for matt: Linux box 2.6.31-9-server #29-Ubuntu SMP Sun Aug 30 18:37:42 UTC 2009 x86_64 GNU/Linux matt@box:~$ su - Password: root@box:~# Modified nsswitch.conf with 'ldap' before 'compat': passwd: ldap compat group: ldap compat shadow: ldap compat matt@box:~$ sudo uname -a sudo: setreuid(ROOT_UID, user_uid): Operation not permitted matt@box:~$ su - Password: setgid: Operation not permitted Modified nsswitch.conf with 'ldap' after 'compat': passwd: compat ldap group: compat ldap shadow: compat ldap matt@box:~$ sudo uname -a [sudo] password for matt: Linux box 2.6.31-9-server #29-Ubuntu SMP Sun Aug 30 18:37:42 UTC 2009 x86_64 GNU/Linux matt@box:~$ su - Password: root@box:~# The same arrangements in nsswitch.conf work as expected in Jaunty and earlier releases. + [Regression Potential] + This should be minimal as the code change only addresses the duplicating global_init during thread callbacks. + + Lucid Release Note: == NSS via LDAP+SSL breaks setuid applications like sudo == Upgrading systems configured to use ldap over ssl as the first service in the nss stack (in nsswitch.conf) leads to a broken nss resolution for setuid applications after the upgrade to Lucid (for example sudo would stop working). There isn't any simple workaround for now. One option is to switch to libnss-ldapd in place of libnss-ldap before the upgrade. Another one consists in using nscd before the upgrade.
-- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to libnss-ldap in Ubuntu. https://bugs.launchpad.net/bugs/423252 Title: NSS using LDAP+SSL breaks setuid applications like su, sudo, apache2 suexec, and atd To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-release-notes/+bug/423252/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
