Bug 818741

Summary: Do not fall back to MD5 when crypt() falls its hashing algo
Product: [Fedora] Fedora Reporter: Paul Wouters <pwouters>
Component: pamAssignee: Tomas Mraz <tmraz>
Status: CLOSED RAWHIDE QA Contact: Fedora Extras Quality Assurance <extras-qa>
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Version: 17CC: tmraz
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Fixed In Version: pam-1.1.5-7.fc18 Doc Type: Bug Fix
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Last Closed: 2012-05-24 08:20:03 UTC Type: Bug
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Description Flags
patch disabling MD5 fallback none

Description Paul Wouters 2012-05-03 20:10:05 UTC 
Description of problem:
There is fallback code that uses crypt() in DES mode when it fails to work with another hashing algorithm via the $x$ salt argument passing.

In fips mode when MD5 is not allowed using a salt of $1$ (for MD5) results in crypt() returning NULL, and the fallback using the even worse then MD5 algo of single DES.
Comment 1 Paul Wouters 2012-05-03 20:11:51 UTC 
Created attachment 581954 [details]
patch disabling MD5 fallback
Comment 2 Paul Wouters 2012-05-03 20:12:49 UTC 
Slight correction, the fallback is to MD5 not DES, and it happens when the FIPS check fails for sha256/sha512.