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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | MODULE TYPES PROVIDED | RETURN VALUES | FILES | SEE ALSO | AUTHORS | COLOPHON |
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PAM_GROUP(8) Linux-PAM Manual PAM_GROUP(8)
pam_group - PAM module for group access
pam_group.so
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 applying for.
By default rules for group memberships are taken from config file
/etc/security/group.conf.
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 mounted nosuid 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 in addition to those entries
/etc/group (or equivalent).
This module does not recognise any options.
Only the auth module type is provided.
PAM_SUCCESS
group membership was granted.
PAM_ABORT
Not all relevant data could be gotten.
PAM_BUF_ERR
Memory buffer error.
PAM_CRED_ERR
Group membership was not granted.
PAM_IGNORE
pam_sm_authenticate was called which does nothing.
PAM_USER_UNKNOWN
The user is not known to the system.
/etc/security/group.conf
Default configuration file
group.conf(5), pam.d(5), pam(8).
pam_group was written by Andrew G. Morgan <morgan@kernel.org>.
This page is part of the linux-pam (Pluggable Authentication
Modules for Linux) project. Information about the project can be
found at ⟨http://www.linux-pam.org/⟩. If you have a bug report
for this manual page, see ⟨//www.linux-pam.org/⟩. This page was
obtained from the project's upstream Git repository
⟨https://github.com/linux-pam/linux-pam.git⟩ on 2023-12-22. (At
that time, the date of the most recent commit that was found in
the repository was 2023-12-18.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
Linux-PAM Manual 12/22/2023 PAM_GROUP(8)
Pages that refer to this page: group.conf(5)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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