Public bug reported:
On Ubuntu 24.04, the OpenLDAP package ships with the library
/usr/lib/ldap/pw-pbkdf2.so.
While this module works for generating PBKDF2-SHA512 password hashes, it does
not provide an option to configure the number of iterations.
For example:
slappasswd -o module-load=pw-pbkdf2.so -h {PBKDF2-SHA512}
generates a hash with a fixed iteration count (e.g. 10000) and does not
accept parameters to increase it.
In contrast, the upstream contrib module passwd/pbkdf2 on
https://git.openldap.org/openldap/openldap/-/tree/master/contrib/slapd-
modules/passwd/pbkdf2
supports the iteration count option and allows administrators to
configure it.
moduleload pw-pbkdf2.so [iterations]
Steps to reproduce:
Install OpenLDAP on Ubuntu 24.04. (slapd and slapd-contrib pakages)
Run
slappasswd -o module-load=pw-pbkdf2.la -h {PBKDF2} -s secret
{PBKDF2}10000$ZvU8GRSybbefW48n8BeyuA$XE1t4W09ZP0z8zmLVb/SbwaOl2Y
Expected behavior:
The pw-pbkdf2.so module should support configuration of the iteration count, as
provided in the upstream passwd/pbkdf2 contrib module.
Actual behavior:
Iteration count is hardcoded (default: 10000), and cannot be changed.
Impact:
Without the ability to configure the iteration count, it is not possible to
meet current security best practices or achieve compliance with FIPS 140-3,
which requires configurable and sufficiently high iteration counts for PBKDF2.
** Affects: openldap (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2125685
Title:
pbkdf2 module not make iterations configurable and FIPS 140-3
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