Man page - pam_stress(8)

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Manual

PAM_STRESS(8) Linux-PAM Manual PAM_STRESS(8)

pam_stress - The stress-testing PAM module

pam_stress.so [debug] [no_warn] [use_first_pass] [try_first_pass] [rootok] [expired] [fail_1] [fail_2] [prelim] [required]

The pam_stress PAM module is mainly intended to give the impression of failing as a fully functioning module might.

debug

Put lots of information in syslog. *NOTE* this option writes passwords to syslog, so don't use anything sensitive when testing.

no_warn

Do not give warnings about things (otherwise warnings are issued via the conversation function)

use_first_pass

Do not prompt for a password, for pam_sm_authentication function just use item PAM_AUTHTOK.

try_first_pass

Do not prompt for a password unless there has been no previous authentication token (item PAM_AUTHTOK is NULL)

rootok

This is intended for the pam_sm_chauthtok function and it instructs this function to permit root to change the user's password without entering the old password.

expired

An argument intended for the account and chauthtok module parts. It instructs the module to act as if the user's password has expired

fail_1

This instructs the module to make its first function fail.

fail_2

This instructs the module to make its second function (if there is one) fail.

prelim

For pam_sm_chauthtok, means fail on PAM_PRELIM_CHECK.

required

For pam_sm_chauthtok, means fail if the user hasn't already been authenticated by this module. (See stress_new_pwd data string in the NOTES.)

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

PAM_BUF_ERR

Memory buffer error.

PAM_PERM_DENIED

Permission denied.

PAM_AUTH_ERR

Access to the system was denied.

PAM_CONV_ERR

Conversation failure.

PAM_SUCCESS

The function passes all checks.

PAM_USER_UNKNOWN

The user is not known to the system.

PAM_CRED_ERR

Failure involving user credentials.

PAM_NEW_AUTHTOK_REQD

Authentication token is no longer valid; new one required.

PAM_SESSION_ERR

Session failure.

PAM_TRY_AGAIN

Failed preliminary check by service.

PAM_AUTHTOK_LOCK_BUSY

Authentication token lock busy.

PAM_AUTHTOK_ERR

Authentication token manipulation error.

PAM_SYSTEM_ERR

System error.

This module uses the stress_new_pwd data string which tells pam_sm_chauthtok that pam_sm_acct_mgmt says we need a new password. The only possible value for this data string is 'yes'.

#%PAM-1.0
#
# Any of the following will suffice
account  required pam_stress.so
auth     required pam_stress.so
password required pam_stress.so
session  required pam_stress.so

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

The pam_stress PAM module was developed by Andrew Morgan <morgan@linux.kernel.org>. The man page for pam_stress was written by Lucas Ramage <ramage.lucas@protonmail.com>.

06/29/2025 Linux-PAM