Date: Thu, 08 Dec 2011 15:04:20 -0500 From: Jeff Mitchell <mitchell@....org> To: oss-security@...ts.openwall.com CC: Kurt Seifried <kseifried@...hat.com> Subject: Re: Disputing CVE-2011-4122 On 12/8/2011 2:47 PM, Kurt Seifried wrote: > On 12/08/2011 07:11 AM, Jeff Mitchell wrote: >> On 12/07/2011 11:26 AM, Kurt Seifried wrote: >>>> One could assume that kcheckpass should do the validation. However, the >>>> PAM documentation makes no mention of what a service name is supposed to >>>> look like, and consequently it must be treated as opaque by the >>>> application code. Therefore all validation must be expected to be done >>>> by the library, and failure to do so must be seen as a bug in the >>>> library exclusively. >>> >>> Can you provide a link to the documentation? >> >> http://pubs.opengroup.org/onlinepubs/8329799/pam_start.htm >> >> Thanks, >> Jeff >> > Looking around I did find: > > http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/3/html/Reference_Guide/s1-pam-config-files.html > > ===================== > 15.2.1. PAM Service Files > > Each PAM-aware application or service has a file within the /etc/pam.d/ > directory. Each file within this directory bears the name of the service > for which it controls access. > > It is up to the PAM-aware program to define its service name and install > its own PAM configuration file in the /etc/pam.d/ directory. For > example, the login program defines its service name as login and > installs the /etc/pam.d/login PAM configuration file. > ===================== > > so to some degree it is defined: the service name must fit legal file > name constraints, but this means things like length, but on ext4 for > example this means 256 chars max, and only NULL and "/" are disallowed, > to say nothing of other file systems like xfs (any bytes except null) > and Joliet (CDFS, max 64 characters, unicode supported) > > So perhaps going for a lowest common denominator of common filesystems > you'd expect to find /etc/ on (so ext4, xfs, maybe Joliet for cd based > systems?) as a filter would be appropriate? And poking the PAM people to > refine the specification a little bit? Thoughts or comments anyone? > >  http://en.wikipedia.org/wiki/Comparison_of_file_systems The documentation you linked to above is for LinuxPAM, not OpenPAM. They're different systems and the bug only affects OpenPAM. --Jeff Download attachment "signature.asc" of type "application/pgp-signature" (261 bytes)
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