** Changed in: openldap (Ubuntu)
Assignee: Sergio Durigan Junior (sergiodj) => Andreas Hasenack (ahasenack)
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https://bugs.launchpad.net/bugs/2000817
Title:
Wrong SHA256-value computed on kinetic
Status in openldap package in Ubuntu:
Triaged
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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