Date: Mon, 30 Jul 2012 11:52:21 +0200 From: Ludwig Nussel <ludwig.nussel@...e.de> To: oss-security@...ts.openwall.com Subject: Re: libdbus hardening Florian Weimer wrote: > On 07/30/2012 10:59 AM, Ludwig Nussel wrote: >> Florian Weimer wrote: >>> On 07/17/2012 12:08 PM, Florian Weimer wrote: >>> >>>> Note that GNU libc will likely change the name to secure_getenv. >>>> Upstream does not want to document __secure_getenv as-is. >>> >>> This will be part of glibc 2.17. autoconf instructions are available here: >>> >>> <http://sourceware.org/glibc/wiki/Tips_and_Tricks/secure_getenv> >> >> Now the next step would be to make glibc automatically use secure_getenv >> when running setuid root and require programs to explicitly call >> insecure_getenv() or something like that :-) > > You're welcome to absorb the transition costs. 8-) I looked into this > briefly, and the potentially insecure getenv calls are not in the > majority, so we'd have to expect quite a bit of breakage, or at least > add a configurable whitelist of variable names in a file in /etc. Potential breakage would only occur in setuid programs that actually use getenv for valid purposes though. I wonder how many of those actually exist. > FWIW, I consider PAM and NSS (Name Service Switch) the major problem > areas, too. Do you know if the APIs would allow confining plug-ins to > subprocesses? Then we only have to solve the transparent child > process problem. No idea. I'd probably rather implement the setuid binary itself as client/server program and get rid of setuid in the first place instead of trying to play tricks in PAM though. cu Ludwig -- (o_ Ludwig Nussel //\ V_/_ http://www.suse.de/ SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 16746 (AG Nürnberg)
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