pam_authenticate (3) - Linux Manuals
pam_authenticate: account authentication
pam_authenticate - account authentication
*pamh, int flags);
The PAM service module may request that the user enter their username vio the the conversation mechanism (see pam_start(3) and pam_conv(3)). The name of the authenticated user will be present in the PAM item PAM_USER. This item may be recovered with a call to pam_get_item(3).
The pamh argument is an authentication handle obtained by a prior call to pam_start(). The flags argument is the binary or of zero or more of the following values:
- Do not emit any messages.
- The PAM module service should return PAM_AUTH_ERR if the user does not have a registered authentication token.
- The application should exit immediately after calling pam_end(3) first.
- The user was not authenticated.
- For some reason the application does not have sufficient credentials to authenticate the user.
- The modules were not able to access the authentication information. This might be due to a network or hardware failure etc.
- One or more of the authentication modules has reached its limit of tries authenticating the user. Do not try again.
- The user was successfully authenticated.
- User unknown to authentication service.