pam_get_pass.c

/* 
 * Copyright (c) 2000. Leon Breedt, Copyright (c) 2002 David D.W. Downey
 * Adapted FreeBSD version 
 */
/*-
 * Copyright 1998 Juniper Networks, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	$FreeBSD: src/lib/libpam/libpam/pam_get_pass.c,v 1.1.1.1 1998/11/18 01:44:37 jdp Exp $
 */

/* $Id: pam_get_pass.c,v 1.2 2003/06/20 10:34:16 ek Exp $ */
#include <stdlib.h>
#include <string.h>
#include <security/pam_modules.h>
#include "pam_mod_misc.h"

static int   pam_conv_pass(pam_handle_t *, const char *, int);

static int
pam_conv_pass(pam_handle_t *pamh, const char *prompt, int options)
{
    int retval;
    const void *item;
    const struct pam_conv *conv;
    struct pam_message msg;
    const struct pam_message *msgs[1];
    struct pam_response *resp;

    if ((retval = pam_get_item(pamh, PAM_CONV, &item)) !=
        PAM_SUCCESS)
        return retval;
    conv = (const struct pam_conv *)item;
    msg.msg_style = options & PAM_OPT_ECHO_PASS ?
        PAM_PROMPT_ECHO_ON : PAM_PROMPT_ECHO_OFF;
    msg.msg = prompt;
    msgs[0] = &msg;
    if ((retval = conv->conv(1, msgs, &resp, conv->appdata_ptr)) !=
        PAM_SUCCESS)
        return retval;
    if ((retval = pam_set_item(pamh, PAM_AUTHTOK, resp[0].resp)) !=
        PAM_SUCCESS)
        return retval;
    memset(resp[0].resp, 0, strlen(resp[0].resp));
    free(resp[0].resp);
    free(resp);
    return PAM_SUCCESS;
}

int
pam_get_pass(pam_handle_t *pamh, const char **passp, const char *prompt,
    int options)
{
    int retval;
    const void *item = NULL;

    /*
     * Grab the already-entered password if we might want to use it.
     */
    if (options & (PAM_OPT_TRY_FIRST_PASS | PAM_OPT_USE_FIRST_PASS)) {
        if ((retval = pam_get_item(pamh, PAM_AUTHTOK, &item)) !=
            PAM_SUCCESS)
            return retval;
    }

    if (item == NULL) {
        /* The user hasn't entered a password yet. */
        if (options & PAM_OPT_USE_FIRST_PASS)
            return PAM_AUTH_ERR;
        /* Use the conversation function to get a password. */
        if ((retval = pam_conv_pass(pamh, prompt, options)) !=
            PAM_SUCCESS ||
            (retval = pam_get_item(pamh, PAM_AUTHTOK, &item)) !=
            PAM_SUCCESS)
            return retval;
    }
    *passp = (const char *)item;
    return PAM_SUCCESS;
}

int
pam_get_confirm_pass(pam_handle_t *pamh, const char **passp, const char *prompt1,
    const char *prompt2, int options)
{
    int retval, i;
    const void *item = NULL;
    const struct pam_conv *conv;
    struct pam_message msgs[2];
    const struct pam_message *pmsgs[2];
    struct pam_response *resp;

    if ((retval = pam_get_item(pamh, PAM_CONV, &item)) != PAM_SUCCESS)
        return retval;

    conv = (const struct pam_conv *)item;
    for(i = 0; i < 2; i++)
        msgs[i].msg_style = options & PAM_OPT_ECHO_PASS ? 
            PAM_PROMPT_ECHO_ON : PAM_PROMPT_ECHO_OFF;
    msgs[0].msg = prompt1;
    msgs[1].msg = prompt2;
    pmsgs[0] = &msgs[0];
    pmsgs[1] = &msgs[1];
    
    if((retval = conv->conv(2, pmsgs, &resp, conv->appdata_ptr)) != PAM_SUCCESS)
        return retval;

    if(!resp)
        return PAM_AUTHTOK_RECOVER_ERR;
    if(strcmp(resp[0].resp, resp[1].resp) != 0)
        return PAM_AUTHTOK_RECOVER_ERR;

    retval = pam_set_item(pamh, PAM_AUTHTOK, resp[0].resp);
    memset(resp[0].resp, 0, strlen(resp[0].resp));
    memset(resp[1].resp, 0, strlen(resp[1].resp));
    free(resp[0].resp);
    free(resp[1].resp);
    free(resp);

    if(retval == PAM_SUCCESS) {
        item = NULL;
        retval = pam_get_item(pamh, PAM_AUTHTOK, (const void **)&item);
        *passp = item;
    }

    return retval;
}