PAM_DEBUG(8) Linux-PAM Manual PAM_DEBUG(8)

pam_debug - PAM module to debug the PAM stack [auth=value] [cred=value] [acct=value] [prechauthtok=value] [chauthtok=value] [auth=value] [open_session=value] [close_session=value]

The pam_debug PAM module is intended as a debugging aide for determining how the PAM stack is operating. This module returns what its module arguments tell it to return.


The pam_sm_authenticate(3) function will return value.


The pam_sm_setcred(3) function will return value.


The pam_sm_acct_mgmt(3) function will return value.


The pam_sm_chauthtok(3) function will return value if the PAM_PRELIM_CHECK flag is set.


The pam_sm_chauthtok(3) function will return value if the PAM_PRELIM_CHECK flag is not set.


The pam_sm_open_session(3) function will return value.


The pam_sm_close_session(3) function will return value.

Where value can be one of: success, open_err, symbol_err, service_err, system_err, buf_err, perm_denied, auth_err, cred_insufficient, authinfo_unavail, user_unknown, maxtries, new_authtok_reqd, acct_expired, session_err, cred_unavail, cred_expired, cred_err, no_module_data, conv_err, authtok_err, authtok_recover_err, authtok_lock_busy, authtok_disable_aging, try_again, ignore, abort, authtok_expired, module_unknown, bad_item, conv_again, incomplete.

All module types (auth, account, password and session) are provided.


Default return code if no other value was specified, else specified return value.

auth    requisite
auth    [success=2 default=ok] auth=perm_denied cred=success
auth    [default=reset] auth=success cred=perm_denied
auth    [success=done default=die]
auth    optional auth=perm_denied cred=perm_denied
auth    sufficient auth=success cred=success

pam.conf(5), pam.d(5), pam(8)

pam_debug was written by Andrew G. Morgan <>.

05/07/2023 Linux-PAM