pam_modules/sample/sample_utils.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1992-1995, by Sun Microsystems, Inc.
 * All rights reserved.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <security/pam_appl.h>
#include <string.h>
#include <stdlib.h>
#include <malloc.h>

#include "sample_utils.h"

/* ******************************************************************** */
/*                                  */
/*      Utilities Functions                 */
/*                                  */
/* ******************************************************************** */

/*
 * __free_msg():
 *  free storage for messages used in the call back "pam_conv" functions
 */

void
__free_msg(num_msg, msg)
    int num_msg;
    struct pam_message *msg;
{
    int             i;
    struct pam_message  *m;

    if (msg) {
        m = msg;
        for (i = 0; i < num_msg; i++, m++) {
            if (m->msg)
                free(m->msg);
        }
        free(msg);
    }
}

/*
 * __free_resp():
 *  free storage for responses used in the call back "pam_conv" functions
 */

void
__free_resp(num_msg, resp)
    int num_msg;
    struct pam_response *resp;
{
    int         i;
    struct pam_response *r;

    if (resp) {
        r = resp;
        for (i = 0; i < num_msg; i++, r++) {
            if (r->resp)
                free(r->resp);
        }
        free(resp);
    }
}

/*
 * __display_errmsg():
 *  display error message by calling the call back functions
 *  provided by the application through "pam_conv" structure
 */

int
__display_errmsg(conv_funp, num_msg, messages, conv_apdp)
    int (*conv_funp)();
    int num_msg;
    char messages[PAM_MAX_NUM_MSG][PAM_MAX_MSG_SIZE];
    void *conv_apdp;
{
    struct pam_message  *msg;
    struct pam_message  *m;
    struct pam_response *resp;
    int         i;
    int         k;
    int         retcode;

    msg = (struct pam_message *)calloc(num_msg,
                    sizeof (struct pam_message));
    if (msg == NULL) {
        return (PAM_CONV_ERR);
    }
    m = msg;

    i = 0;
    k = num_msg;
    resp = NULL;
    while (k--) {
        /*
         * fill out the pam_message structure to display error message
         */
        m->msg_style = PAM_ERROR_MSG;
        m->msg = (char *)malloc(PAM_MAX_MSG_SIZE);
        if (m->msg != NULL)
            (void) strcpy(m->msg, (const char *)messages[i]);
        else
            continue;
        m++;
        i++;
    }

    /*
     * Call conv function to display the message,
     * ignoring return value for now
     */
    retcode = conv_funp(num_msg, &msg, &resp, conv_apdp);
    __free_msg(num_msg, msg);
    __free_resp(num_msg, resp);
    return (retcode);
}

/*
 * __get_authtok():
 *  get authentication token by calling the call back functions
 *  provided by the application through "pam_conv" structure
 */

int
__get_authtok(conv_funp, num_msg, messages, conv_apdp, ret_respp)
    int (*conv_funp)();
    int num_msg;
    char messages[PAM_MAX_NUM_MSG][PAM_MAX_MSG_SIZE];
    void *conv_apdp;
    struct pam_response **ret_respp;
{
    struct pam_message  *msg;
    struct pam_message  *m;
    int         i;
    int         k;
    int         retcode;

    i = 0;
    k = num_msg;

    msg = (struct pam_message *)calloc(num_msg,
                        sizeof (struct pam_message));
    if (msg == NULL) {
        return (PAM_CONV_ERR);
    }
    m = msg;

    while (k--) {
        /*
         * fill out the message structure to display error message
         */
        m->msg_style = PAM_PROMPT_ECHO_OFF;
        m->msg = (char *)malloc(PAM_MAX_MSG_SIZE);
        if (m->msg != NULL)
            (void) strcpy(m->msg, (char *)messages[i]);
        else
            continue;
        m++;
        i++;
    }

    /*
     * Call conv function to display the prompt,
     * ignoring return value for now
     */
    retcode = conv_funp(num_msg, &msg, ret_respp, conv_apdp);
    __free_msg(num_msg, msg);
    return (retcode);
}