Red Hat Bugzilla – Bug 538080
Outdated /etc/login.defs file shipped with shadow-utils (SHA512 hashing not enabled)
Last modified: 2010-06-28 11:28:32 EDT
Description of problem:
Apparently package shadow-utils in FC10 and FC11, is still shipping an outdated default version of /etc/login.defs which does not enable SHA512 hashing. The new SHA512 password hashing feature is described in http://people.redhat.com/drepper/sha-crypt.html and the new configuration enabling SHA512 was probably introduced with authconfig-5.3.19-1 (see resolution of https://bugzilla.redhat.com/show_bug.cgi?id=218652).
However, at the moment the correct configuration of password hashing using SHA512 relies only on the configuration done by authconfig, as package shadow-utils is still shipping a version of the login.defs file which does enable MD5 and not SHA512.
It would be safer if shadow-utils could install an updated login.defs which includes the ENCRYPT_METHOD_SHA512 definition. This would also make the package fully compliant with http://csrc.nist.gov/groups/ST/hash/policy.html.
Version-Release number of selected component (if applicable):
For example, 4.1.2-9.fc10, 4.1.2-13.fc11 and 18.104.22.168-5.fc11.
Steps to Reproduce:
1. install package shadow-utils on FC10 or FC11
Unless /etc/login.defs is already installed in the system (%config(noreplace)), a wrong login.defs file is installed (enabling MD5 hashing rather than the safer SHA512 hashing).
Luckily somewhere during the initial installation authconfig is taking care of configuring SHA512 hashing, but is this always the case (what happens for example if the user would re-install the package with something like 'rpm --force') ??
An updated login.defs file should be shipped with shadow-utils to be on the safe side. The last line of the updated login.defs file is "ENCRYPT_METHOD SHA512": this should override any possible value (yes/no) for MD5_CRYPT_ENAB.
I have checked if reinstalling the package could overwrite the configuration files and the result is that there is no chance that even "rpm --force" could take precedence over the "%config(noreplace)" directive in the .spec file. There is still the risk of an administrator doing "rpm -e --nodeps" && "rpm -i" (or unpackaging the rpm with rpm2cpio)...
And however, it remains the fact that the package is still carrying an outdated, non-compliant configuration file.
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