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PAM_USERTYPE
Section: Linux-PAM Manual (8) Updated: 02/02/2026 Index
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NAME
pam_usertype - check if the authenticated user is a system or regular account
SYNOPSIS
-
pam_usertype.so [flag...] {condition}
DESCRIPTION
pam_usertype.so is designed to succeed or fail authentication based on type of the account of the authenticated user. The type of the account is decided with help of
SYS_UID_MAX
settings in
/etc/login.defs. One use is to select whether to load other modules based on this test.
The module should be given only one condition as module argument. Authentication will succeed only if the condition is met.
OPTIONS
The following
flags are supported:
use_uid
-
Evaluate conditions using the account of the user whose UID the application is running under instead of the user being authenticated.
audit
-
Log unknown users to the system log.
Available
conditions are:
issystem
-
Succeed if the user is a system user.
isregular
-
Succeed if the user is a regular user.
MODULE TYPES PROVIDED
All module types (account,
auth,
password
and
session) are provided.
RETURN VALUES
PAM_SUCCESS
-
The condition was true.
PAM_BUF_ERR
-
Memory buffer error.
PAM_CONV_ERR
-
The conversation method supplied by the application failed to obtain the username.
PAM_INCOMPLETE
-
The conversation method supplied by the application returned PAM_CONV_AGAIN.
PAM_AUTH_ERR
-
The condition was false.
PAM_SERVICE_ERR
-
A service error occurred or the arguments can't be parsed correctly.
PAM_USER_UNKNOWN
-
User was not found.
EXAMPLES
Skip remaining modules if the user is a system user:
-
account sufficient pam_usertype.so issystem
SEE ALSO
login.defs(5),
pam(8)
AUTHOR
Pavel Březina <pbrezina@redhat.com>
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- MODULE TYPES PROVIDED
-
- RETURN VALUES
-
- EXAMPLES
-
- SEE ALSO
-
- AUTHOR
-
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