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pam_list.so.1
The username is the value of PAM_USER. The host is the value of PAM_RHOST or, if PAM_RHOST is not set, the value of the localhost as returned by gethostname(3C) is used.
If neither of the allow, deny, or compat options are specified, the module will look for +/- entries in the local /etc/passwd file. If this style is used, nsswitch.conf(5) must not be configured with compat for the passwd database. If no relevant +/- entry exists for the user, pam_list is not participating in result.
If compat option is specified then the module will look for +/- entries in the local /etc/passwd file. Other entries in this file will be counted as + entries. If no relevant entry exits for the user, pam_list will deny the access.
The following options can be passed to the module: allow=
The full pathname to a file of allowed users, groups, and/or netgroups. Only one of allow= or deny= can be specified.
Activate compat mode.
The full pathname to a file of denied users, groups, and/or netgroups. Only one of deny= or allow= can be specified.
Provide syslog(3C) debugging information at the LOG_AUTH | LOG_DEBUG level.
The module should perform group membership matches for the username.
The module should only perform netgroup matches on the username. This is the default option.
The username should not be used in the netgroup match.
Only the host should be used in netgroup matches.
The hostname should not be used in netgroup matches.
The user and hostname must be in the same netgroup.
An invalid set of module options was given in the pam.conf(5) for this module, or the user/netgroup file could not be opened.
A memory buffer error occurred.
The module is ignored, as it is not participating in the result.
The user is not on the allow list or is on the deny list.
The account is valid for use at this time.
No account is present for the user
/etc/pam.conf modification looks like:
other account requisite pam_roles.so.1 other account required pam_unix_account.so.1 other account required pam_list.so.1
In the case of default mode or compat mode, the important lines in /etc/passwd appear as follows:
+loginname - user is approved -loginname - user is disapproved +@netgroup - netgroup members are approved -@netgroup - netgroup members are disapproved
Example 2 Using pam_list with allow file
/etc/pam.conf modification looks like:
other account requisite pam_roles.so.1 other account required pam_unix_account.so.1 other account required pam_list.so.1 allow=/etc/users.allow
/etc/users.allow contains:
root localloginname remoteloginname @netgroup
Example 3 Using pam_list with allow file to allow members of the 'admins' group access.
/etc/pam.conf modification looks like:
other account requisite pam_roles.so.1 other account required pam_unix_account.so.1 other account required pam_list.so.1 group allow=/etc/users.allow
/etc/users.allow contains:
root %admins
| ATTRIBUTE TYPE ATTRIBUTE VALUE |
| Interface Stability Committed |
| MT-Level MT-Safe with exceptions |
The interfaces in libpam(3LIB) are MT-Safe only if each thread within the multithreaded application uses its own PAM handle.