PAM_AUTHENTICATE(3)

NAME
pam_authenticate - perform authentication within the PAM framework

SYNOPSIS
#include <sys/types.h>
#include <security/pam_appl.h>
int
pam_authenticate(pam_handle_t *pamh, int flags);

DESCRIPTION
The pam_authenticate() function attempts to authenticate the user associated with the pam context specified by the pamh argument.

The application is free to call pam_authenticate() as many times as it wishes, but some modules may maintain an internal retry counter and return PAM_MAXTRIES when it exceeds some preset or hardcoded limit.

The flags argument is the binary or of zero or more of the following values:

PAM_SILENT
    Do not emit any messages.

PAM_DISALLOW_NULL_AUTHTOK
    Fail if the user's authentication token is null.

If any other bits are set, pam_authenticate() will return PAM_BAD_CONSTANT.

RETURN VALUES
The pam_authenticate() function returns one of the following values:

[PAM_SUCCESS]
    Success.

[PAM_ABORT]
    General failure.

[PAM_AUTHINFO_UNAVAIL]
    Authentication information is unavailable.

[PAM_AUTH_ERR]
    Authentication error.

[PAM_BAD_CONSTANT]
    Bad constant.

[PAM_BUF_ERR]
    Memory buffer error.

[PAM_CONV_ERR]
    Conversation failure.

[PAM_CRED_INSUFFICIENT]
    Insufficient credentials.

[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.

SEE ALSO
pam(3), pam_strerror(3)

STANDARDS
X/Open Single Sign-On Service (XSSO) - Pluggable Authentication Modules, June 1997.

AUTHORS
The pam_authenticate() function and this manual page were developed for the FreeBSD Project by ThinkSec AS and Network Associates Laboratories, the Security Research Division of Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 (“CBOSS”), as part of the DARPA CHATS research program.

The OpenPAM library is maintained by Dag-Erling Smørgrav <des@des.no>.