The actual value is less important than whether it matches the
regular expression. A number of legal but difficult to know in
context realms could be passed in here (trust for example).
This fixes CVE-2024-1481
Fixes: https://pagure.io/freeipa/issue/9541
Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>
Do minimal validation of the Kerberos principal name when passing it to
kinit command line tool. Also pass it as the final argument to prevent
option injection.
Accepted Kerberos principals are:
- user names, using the following regexp
(username with optional @realm, no spaces or slashes in the name):
"(?!^[0-9]+$)^[a-zA-Z0-9_.][a-zA-Z0-9_.-]*[a-zA-Z0-9_.$-]?@?[a-zA-Z0-9.-]*$"
- service names (with slash in the name but no spaces). Validation of
the hostname is done. There is no validation of the service name.
The regular expression above also covers cases where a principal name
starts with '-'. This prevents option injection as well.
This fixes CVE-2024-1481
Fixes: https://pagure.io/freeipa/issue/9541
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>
