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Description of problem:

As per the upstream ticket https://github.com/SSSD/sssd/issues/6635 I am opening this bz.

Solution provided by Tomáš

Default re_expressions does not use "^" so they may skip/ignore some leading character (@ and \)
Changing

#define SSS_DEFAULT_RE "(?P<name>[^@]+)@?(?P<domain>[^@]*$)"
to

#define SSS_DEFAULT_RE "^(?P<name>[^@]+)@?(?P<domain>[^@]*$)"
and similar change for SSS_IPA_AD_DEFAULT_RE will solve the issue. It will make SSSD more strict about input values.

Consider that this regular expression is used also for group names and MS Windows group name can actually include @

$ grep "SSS_DEFAULT_RE" util/util.h 
#define SSS_DEFAULT_RE "(?P<name>[^@]+)@?(?P<domain>[^@]*$)"

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.
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Actual results:


Expected results:


Additional info:

*** Bug 2180998 has been marked as a duplicate of this bug. ***

Upstream PR: https://github.com/SSSD/sssd/pull/6646

Pushed PR: https://github.com/SSSD/sssd/pull/6646

* `master`
    * b78b508b1dbdb78c8d17916472a3398d67f76bbd - responder: regexp cleanup
    * 526aea3e8cb48dbfaabb009e06236828ad903429 - util: Improve re_expression defaults

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (sssd bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:7127

The needinfo request[s] on this closed bug have been removed as they have been unresolved for 120 days