This bug was fixed in the package openldap - 2.6.3+dfsg-1~exp1ubuntu2
---------------
openldap (2.6.3+dfsg-1~exp1ubuntu2) lunar; urgency=medium
* Build the passwd/sha2 contrib module with -fno-strict-aliasing to
avoid computing an incorrect SHA256 hash with some versions of the
compiler (LP: #2000817):
- d/t/{control,sha2-contrib}: test to verify the SHA256 hash
produced by passwd/sha2
- d/rules: set -fno-strict-aliasing only when building the
passwd/sha2 contrib module
* d/t/smbk5pwd: Allow the openldap user to read the Heimdal master key in the
smbk5pwd DEP8 test (LP: #2004560)
-- Andreas Hasenack <[email protected]> Fri, 03 Feb 2023 09:33:14
-0300
** Changed in: openldap (Ubuntu Lunar)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/2000817
Title:
Wrong SHA256-value computed on kinetic
Status in openldap package in Ubuntu:
Fix Released
Status in openldap source package in Jammy:
In Progress
Status in openldap source package in Kinetic:
In Progress
Status in openldap source package in Lunar:
Fix Released
Status in openldap package in Debian:
Unknown
Bug description:
The OpenLDAP-contrib module sha2 (located in contrib/slapd-
modules/passwd/sha2/) computes a wrong SHA256/SSHA256-hash on Ubuntu
kinetic. This breaks our current password-authentication in ldap.
The problematic computation:
$ slappasswd -s secret -h '{SHA256}' -o module-load=pw-sha2
{SHA256}WIrrpN3OjEVOUf6yrH1j+o+ODuUuNBo979Od4UXnu54=
The (correct) reference-value on the same system (or older ubuntu
Versions):
$ echo -n "secret" | openssl dgst -sha256 -binary | openssl enc -base64
K7gNU3sdo+OL0wNhqoVWhr3g6s1xYv72ol/pe/Unols=
We nailed the problem down to a bug in the gcc-optimizer for strict-aliasing.
so most probably the gcc-version on kinetic (v12.2.0) is the reason. The
workaround is to compile the sha2-Module with the flag "-fno-strict-aliasing".
Then the correct value is computed. An example taken from a git-compiled
version of OpenLDAP 2.5.13:
$ ./servers/slapd/slappasswd -T passwd -s secret -h '{SHA256}' -o
module-load=pw-sha2 -o module-path=contrib/slapd-modules/passwd/sha2/.libs
{SHA256}K7gNU3sdo+OL0wNhqoVWhr3g6s1xYv72ol/pe/Unols=
Ubuntu:
Description: Ubuntu 22.10
Release: 22.10
OpenLDAP-Package: 2.5.13+dfsg-1ubuntu1
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