1 files changed, 51 insertions, 0 deletions
diff --git a/modules/pam_group/README b/modules/pam_group/README
new file mode 100644
index 0000000..0492023
--- /dev/null
+++ b/modules/pam_group/README
@@ -0,0 +1,51 @@
+pam_group — PAM module for group access
+
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+DESCRIPTION
+
+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).
+
+EXAMPLES
+
+These are some example lines which might be specified in /etc/security/
+group.conf.
+
+Running 'xsh' on tty* (any ttyXXX device), the user 'us' is given access to the
+floppy (through membership of the floppy group)
+
+xsh;tty*&!ttyp*;us;Al0000-2400;floppy
+
+Running 'xsh' on tty* (any ttyXXX device), the user 'sword' is given access to
+games (through membership of the floppy group) after work hours.
+
+xsh; tty* ;sword;!Wk0900-1800;games, sound
+xsh; tty* ;*;Al0900-1800;floppy
+
+
+Any member of the group 'admin' running 'xsh' on tty*, is granted access (at
+any time) to the group 'plugdev'
+
+xsh; tty* ;%admin;Al0000-2400;plugdev
+
+