The
pam_sm_authenticate function returns one of the following values:
[PAM_ABORT]
General failure.
[PAM_AUTHINFO_UNAVAIL]
Authentication information is unavailable.
[PAM_AUTH_ERR]
Authentication error.
[PAM_BUF_ERR]
Memory buffer error.
[PAM_CONV_ERR]
Conversation failure.
[PAM_CRED_INSUFFICIENT]
Insufficient credentials.
[PAM_IGNORE]
Ignore this module.
[PAM_MAXTRIES]
Maximum number of tries exceeded.
[PAM_PERM_DENIED]
Permission denied.
[PAM_SERVICE_ERR]
Error in service module.
[PAM_SYSTEM_ERR]
System error.
[PAM_USER_UNKNOWN]
Unknown user.