pam_setcred (3) - Linux Man Pages
pam_setcred: establish / delete user credentials
pam_setcred - establish / delete user credentials
*pamh, int flags);
A credential is something that the user possesses. It is some property, such as a Kerberos ticket, or a supplementary group membership that make up the uniqueness of a given user. On a Linux system the user's UID and GID's are credentials too. However, it has been decided that these properties (along with the default supplementary groups of which the user is a member) are credentials that should be set directly by the application and not by PAM. Such credentials should be established, by the application, prior to a call to this function. For example, initgroups(2) (or equivalent) should have been performed.
Valid flags, any one of which, may be logically OR'd with PAM_SILENT, are:
- Initialize the credentials for the user.
- Delete the user's credentials.
- Fully reinitialize the user's credentials.
- Extend the lifetime of the existing credentials.
- Memory buffer error.
- Failed to set user credentials.
- User credentials are expired.
- Failed to retrieve user credentials.
- Data was successful stored.
- A NULL pointer was submitted as PAM handle, the function was called by a module or another system error occured.
- User is not known to an authentication module.