pam_group - PAM module for group access
The pam_group PAM module does not authenticate the user, but instead it grants
group memberships (in the credential setting phase of the authentication
module) to the user. Such memberships are based on the service they are
By default rules for group memberships are taken from config file
This module's usefulness relies on the file-systems accessible to the user. The
point being that once granted the membership of a group, the user may attempt
to create a setgid
binary with a restricted group ownership. Later,
when the user is not given membership to this group, they can recover group
membership with the precompiled binary. The reason that the file-systems that
the user has access to are so significant, is the fact that when a system is
the user is unable to create or execute such a binary
file. For this module to provide any level of security, all file-systems that
the user has write access to should be mounted nosuid
The pam_group module functions in parallel with the /etc/group file. If the user
is granted any groups based on the behavior of this module, they are granted
to those entries /etc/group (or equivalent).
This module does not recognise any options.
Only the auth
module type is provided.
group membership was granted.
Not all relevant data could be gotten.
Memory buffer error.
Group membership was not granted.
pam_sm_authenticate was called which
The user is not known to the system.
Default configuration file
pam_group was written by Andrew G. Morgan <firstname.lastname@example.org>.