libcryptoutil/common/passutils.c

	passutils.c revision 1c9bd843ebc00801cc418156a3893362a1dc872e
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <locale.h>
#include <cryptoutil.h>

#define MAX_PASS_TRIES      5   /* maximum tries to get passphrase */

#define DEFAULT_TOKEN_PROMPT    gettext("Enter PIN for %s: ")
#define DEFAULT_TOKEN_REPROMPT  gettext("Re-enter PIN for %s: ")
#define DEFAULT_TOKEN_MINSIZE   gettext("PIN must be at least %d characters.\n")

#define DEFAULT_USER_PROMPT gettext("Enter key: ")
#define DEFAULT_USER_REPROMPT   gettext("Re-enter key: ")
#define DEFAULT_USER_MINSIZE    gettext("Key must be at least %d characters.\n")

#define DEFAULT_PK11TOKEN   SOFT_TOKEN_LABEL

/*
 * Default token name
 */
char *
pkcs11_default_token(void)
{
    return (DEFAULT_PK11TOKEN);
}

/*
 * Prompt user for a passphrase or the PIN for a token.
 *
 * An optional minimum length can be enforced.  Caller can optionally also
 * reprompt for the passphrase/PIN to confirm it was entered correctly.
 * The caller must free the buffer containing the passphrase/PIN with free().
 * 0 returned for success, -1 for failure with the first passphrase/PIN,
 * -2 for failure with the optional second passphrase/PIN used to confirm.
 */
int
pkcs11_get_pass(char *token_name, char **pdata, size_t *psize, size_t min_psize,
    boolean_t with_confirmation)
{
    char    prompt[1024];
    char    *tmpbuf = NULL;
    char    *databuf = NULL;
    int tries;

    if (token_name != NULL)
        (void) snprintf(prompt, sizeof (prompt), DEFAULT_TOKEN_PROMPT,
            token_name);
    else
        (void) snprintf(prompt, sizeof (prompt), DEFAULT_USER_PROMPT);

    for (tries = MAX_PASS_TRIES; tries > 0; tries--) {
        tmpbuf = getpassphrase(prompt);
        if (tmpbuf == NULL)
            return (-1);

        if (strnlen(tmpbuf, min_psize) >= min_psize)
            break;

        if (token_name != NULL)
            (void) printf(DEFAULT_TOKEN_MINSIZE, min_psize);
        else
            (void) printf(DEFAULT_USER_MINSIZE, min_psize);
    }
    if (tries == 0) {
        (void) printf(gettext("Exceeded number of attempts.\n"));
        return (-1);
    }

    databuf = strdup(tmpbuf);
    (void) memset(tmpbuf, 0, strlen(tmpbuf));   /* clean up */
    if (databuf == NULL)
        return (-1);

    if (with_confirmation) {
        if (token_name != NULL)
            (void) snprintf(prompt, sizeof (prompt),
                DEFAULT_TOKEN_REPROMPT, token_name);
        else
            (void) snprintf(prompt, sizeof (prompt),
                DEFAULT_USER_REPROMPT);
        tmpbuf = getpassphrase(prompt);
        if (tmpbuf == NULL) {
            /* clean up */
            (void) memset(databuf, 0, strlen(databuf));
            free(databuf);
            return (-2);
        }

        if (strcmp(databuf, tmpbuf) != 0) {
            /* clean up */
            (void) memset(tmpbuf, 0, strlen(tmpbuf));
            (void) memset(databuf, 0, strlen(databuf));
            free(databuf);
            return (-2);
        }
    }

    *pdata = databuf;
    *psize = strlen(databuf);

    return (0);
}