/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */

/* lib/kadm5/srv/pwqual_princ.c */

/*

 * Copyright (C) 2010 by the Massachusetts Institute of Technology.

 * All rights reserved.

 *

 * Export of this software from the United States of America may

 *   require a specific license from the United States Government.

 *   It is the responsibility of any person or organization contemplating

 *   export to obtain such a license before exporting.

 *

 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and

 * distribute this software and its documentation for any purpose and

 * without fee is hereby granted, provided that the above copyright

 * notice appear in all copies and that both that copyright notice and

 * this permission notice appear in supporting documentation, and that

 * the name of M.I.T. not be used in advertising or publicity pertaining

 * to distribution of the software without specific, written prior

 * permission.  Furthermore if you modify this software you must label

 * your software as modified software and not distribute it in such a

 * fashion that it might be confused with the original M.I.T. software.

 * M.I.T. makes no representations about the suitability of

 * this software for any purpose.  It is provided "as is" without express

 * or implied warranty.

 */

/* Password quality module to check passwords against principal components */

#include "k5-int.h"

#include <krb5/pwqual_plugin.h>

#include "server_internal.h"

static krb5_error_code

princ_check(krb5_context context, krb5_pwqual_moddata data,

            const char *password, const char *policy_name,

            krb5_principal princ, const char **languages)

{

    int i, n;

    char *cp;

    /* Don't check for principals with no password policy. */

    if (policy_name == NULL)

        return 0;

    /* Check against components of the principal. */

    n = krb5_princ_size(handle->context, princ);

    cp = krb5_princ_realm(handle->context, princ)->data;

    if (strcasecmp(cp, password) == 0)

        return KADM5_PASS_Q_DICT;

    for (i = 0; i < n; i++) {

        cp = krb5_princ_component(handle->context, princ, i)->data;

        if (strcasecmp(cp, password) == 0) {

            k5_setmsg(context, KADM5_PASS_Q_DICT,

                      _("Password may not match principal name"));

            return KADM5_PASS_Q_DICT;

        }

    }

    return 0;

}

krb5_error_code

pwqual_princ_initvt(krb5_context context, int maj_ver, int min_ver,

                    krb5_plugin_vtable vtable)

{

    krb5_pwqual_vtable vt;

    if (maj_ver != 1)

        return KRB5_PLUGIN_VER_NOTSUPP;

    vt = (krb5_pwqual_vtable)vtable;

    vt->name = "princ";

    vt->check = princ_check;

    return 0;

}