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/* $OpenBSD: encrypt.c,v 1.34 2014/12/24 22:04:26 tedu Exp $ */
/*
* Copyright (c) 1996, Jason Downs. 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(S) ``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(S) 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.
*/
#include <sys/types.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <login_cap.h>
#include <limits.h>
/*
* Very simple little program, for encrypting passwords from the command
* line. Useful for scripts and such.
*/
extern char *__progname;
void usage(void);
int ideal_rounds(void);
void print_passwd(char *, int, void *);
#define DO_BLF 0
void
usage(void)
{
(void)fprintf(stderr,
"usage: %s [-b rounds] [-c class] [-p | string]\n",
__progname);
exit(1);
}
/*
* Time how long 8 rounds takes to measure this system's performance.
* We are aiming for something that takes between 0.25 and 0.5 seconds.
*/
int
ideal_rounds(void)
{
clock_t before, after;
int r = 8;
char buf[_PASSWORD_LEN];
int duration;
strlcpy(buf, bcrypt_gensalt(r), _PASSWORD_LEN);
before = clock();
crypt("testpassword", buf);
after = clock();
duration = after - before;
/* too quick? slow it down. */
while (duration <= CLOCKS_PER_SEC / 4) {
r += 1;
duration *= 2;
}
/* too slow? speed it up. */
while (duration > CLOCKS_PER_SEC / 2) {
r -= 1;
duration /= 2;
}
return r;
}
void
print_passwd(char *string, int operation, void *extra)
{
char buffer[_PASSWORD_LEN];
if (operation == DO_BLF) {
int rounds = *(int *)extra;
if (bcrypt_newhash(string, rounds, buffer, sizeof(buffer)) != 0)
errx(1, "bcrypt newhash failed");
fputs(buffer, stdout);
return;
} else {
login_cap_t *lc;
const char *pref;
if ((lc = login_getclass(extra)) == NULL)
errx(1, "unable to get login class `%s'",
extra ? (char *)extra : "default");
pref = login_getcapstr(lc, "localcipher", NULL, NULL);
if (crypt_newhash(string, pref, buffer, sizeof(buffer)) != 0)
errx(1, "can't generate hash");
}
fputs(buffer, stdout);
}
int
main(int argc, char **argv)
{
int opt;
int operation = -1;
int prompt = 0;
int rounds;
void *extra = NULL; /* Store salt or number of rounds */
const char *errstr;
while ((opt = getopt(argc, argv, "pb:c:")) != -1) {
switch (opt) {
case 'p':
prompt = 1;
break;
case 'b': /* Blowfish password hash */
if (operation != -1)
usage();
operation = DO_BLF;
if (strcmp(optarg, "a") == 0)
rounds = ideal_rounds();
else
rounds = strtonum(optarg, 1, INT_MAX, &errstr);
if (errstr != NULL)
errx(1, "%s: %s", errstr, optarg);
extra = &rounds;
break;
case 'c': /* user login class */
extra = optarg;
operation = -1;
break;
default:
usage();
}
}
if (((argc - optind) < 1)) {
char line[BUFSIZ], *string;
if (prompt) {
if ((string = getpass("Enter string: ")) == NULL)
err(1, "getpass");
print_passwd(string, operation, extra);
(void)fputc('\n', stdout);
} else {
size_t len;
/* Encrypt stdin to stdout. */
while (!feof(stdin) &&
(fgets(line, sizeof(line), stdin) != NULL)) {
len = strlen(line);
if (len == 0 || line[0] == '\n')
continue;
if (line[len - 1] == '\n')
line[len - 1] = '\0';
print_passwd(line, operation, extra);
(void)fputc('\n', stdout);
}
}
} else {
char *string;
/* can't combine -p with a supplied string */
if (prompt)
usage();
/* Perhaps it isn't worth worrying about, but... */
if ((string = strdup(argv[optind])) == NULL)
err(1, NULL);
/* Wipe the argument. */
memset(argv[optind], 0, strlen(argv[optind]));
print_passwd(string, operation, extra);
(void)fputc('\n', stdout);
/* Wipe our copy, before we free it. */
memset(string, 0, strlen(string));
free(string);
}
exit(0);
}
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