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|
/* $OpenBSD: passwd.c,v 1.12 2021/12/12 20:40:25 tb Exp $ */
#if defined OPENSSL_NO_MD5
#define NO_MD5CRYPT_1
#endif
#if !defined(OPENSSL_NO_DES) || !defined(NO_MD5CRYPT_1)
#include <assert.h>
#include <string.h>
#include "apps.h"
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#ifndef OPENSSL_NO_DES
#include <openssl/des.h>
#endif
#ifndef NO_MD5CRYPT_1
#include <openssl/md5.h>
#endif
static unsigned const char cov_2char[64] = {
/* from crypto/des/fcrypt.c */
0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44,
0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C,
0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54,
0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62,
0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,
0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72,
0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A
};
static int
do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
char *passwd, BIO * out, int quiet, int table, int reverse,
size_t pw_maxlen, int usecrypt, int use1, int useapr1);
static struct {
char *infile;
int in_stdin;
int noverify;
int quiet;
int reverse;
char *salt;
int table;
int use1;
int useapr1;
int usecrypt;
} passwd_config;
static const struct option passwd_options[] = {
#ifndef NO_MD5CRYPT_1
{
.name = "1",
.desc = "Use MD5 based BSD password algorithm 1",
.type = OPTION_FLAG,
.opt.flag = &passwd_config.use1,
},
{
.name = "apr1",
.desc = "Use apr1 algorithm (Apache variant of BSD algorithm)",
.type = OPTION_FLAG,
.opt.flag = &passwd_config.useapr1,
},
#endif
#ifndef OPENSSL_NO_DES
{
.name = "crypt",
.desc = "Use crypt algorithm (default)",
.type = OPTION_FLAG,
.opt.flag = &passwd_config.usecrypt,
},
#endif
{
.name = "in",
.argname = "file",
.desc = "Read passwords from specified file",
.type = OPTION_ARG,
.opt.arg = &passwd_config.infile,
},
{
.name = "noverify",
.desc = "Do not verify password",
.type = OPTION_FLAG,
.opt.flag = &passwd_config.noverify,
},
{
.name = "quiet",
.desc = "Do not output warnings",
.type = OPTION_FLAG,
.opt.flag = &passwd_config.quiet,
},
{
.name = "reverse",
.desc = "Reverse table columns (requires -table)",
.type = OPTION_FLAG,
.opt.flag = &passwd_config.reverse,
},
{
.name = "salt",
.argname = "string",
.desc = "Use specified salt",
.type = OPTION_ARG,
.opt.arg = &passwd_config.salt,
},
{
.name = "stdin",
.desc = "Read passwords from stdin",
.type = OPTION_FLAG,
.opt.flag = &passwd_config.in_stdin,
},
{
.name = "table",
.desc = "Output cleartext and hashed passwords (tab separated)",
.type = OPTION_FLAG,
.opt.flag = &passwd_config.table,
},
{ NULL },
};
static void
passwd_usage(void)
{
fprintf(stderr, "usage: passwd [-1 | -apr1 | -crypt] [-in file] "
"[-noverify] [-quiet]\n"
" [-reverse] [-salt string] [-stdin] [-table] [password]\n\n");
options_usage(passwd_options);
}
int
passwd_main(int argc, char **argv)
{
char *passwd = NULL, **passwds = NULL;
char *salt_malloc = NULL, *passwd_malloc = NULL;
size_t passwd_malloc_size = 0;
BIO *in = NULL, *out = NULL;
int badopt = 0;
int passed_salt = 0;
size_t pw_maxlen = 0;
int argsused;
int ret = 1;
if (single_execution) {
if (pledge("stdio cpath wpath rpath tty", NULL) == -1) {
perror("pledge");
exit(1);
}
}
memset(&passwd_config, 0, sizeof(passwd_config));
if (options_parse(argc, argv, passwd_options, NULL, &argsused) != 0) {
passwd_usage();
goto err;
}
if (argsused < argc)
passwds = &argv[argsused];
if (passwd_config.salt != NULL)
passed_salt = 1;
if (!passwd_config.usecrypt && !passwd_config.use1 &&
!passwd_config.useapr1)
passwd_config.usecrypt = 1; /* use default */
if (passwd_config.usecrypt + passwd_config.use1 +
passwd_config.useapr1 > 1)
badopt = 1; /* conflicting options */
/* Reject unsupported algorithms */
#ifdef OPENSSL_NO_DES
if (passwd_config.usecrypt)
badopt = 1;
#endif
#ifdef NO_MD5CRYPT_1
if (passwd_config.use1 || passwd_config.useapr1)
badopt = 1;
#endif
if (badopt) {
passwd_usage();
goto err;
}
if ((out = BIO_new(BIO_s_file())) == NULL)
goto err;
BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
if (passwd_config.infile != NULL || passwd_config.in_stdin) {
if ((in = BIO_new(BIO_s_file())) == NULL)
goto err;
if (passwd_config.infile != NULL) {
assert(passwd_config.in_stdin == 0);
if (BIO_read_filename(in, passwd_config.infile) <= 0)
goto err;
} else {
assert(passwd_config.in_stdin);
BIO_set_fp(in, stdin, BIO_NOCLOSE);
}
}
if (passwd_config.usecrypt)
pw_maxlen = 8;
else if (passwd_config.use1 || passwd_config.useapr1)
pw_maxlen = 256;/* arbitrary limit, should be enough for most
* passwords */
if (passwds == NULL) {
/* no passwords on the command line */
passwd_malloc_size = pw_maxlen + 2;
/* longer than necessary so that we can warn about truncation */
passwd = passwd_malloc = malloc(passwd_malloc_size);
if (passwd_malloc == NULL)
goto err;
}
if (in == NULL && passwds == NULL) {
/* build a null-terminated list */
static char *passwds_static[2] = {NULL, NULL};
passwds = passwds_static;
if (in == NULL)
if (EVP_read_pw_string(passwd_malloc,
passwd_malloc_size, "Password: ",
!(passed_salt || passwd_config.noverify)) != 0)
goto err;
passwds[0] = passwd_malloc;
}
if (in == NULL) {
assert(passwds != NULL);
assert(*passwds != NULL);
do { /* loop over list of passwords */
passwd = *passwds++;
if (!do_passwd(passed_salt, &passwd_config.salt,
&salt_malloc, passwd, out, passwd_config.quiet,
passwd_config.table, passwd_config.reverse,
pw_maxlen, passwd_config.usecrypt,
passwd_config.use1, passwd_config.useapr1))
goto err;
} while (*passwds != NULL);
} else {
int done;
assert(passwd != NULL);
do {
int r = BIO_gets(in, passwd, pw_maxlen + 1);
if (r > 0) {
char *c = (strchr(passwd, '\n'));
if (c != NULL)
*c = 0; /* truncate at newline */
else {
/* ignore rest of line */
char trash[BUFSIZ];
do
r = BIO_gets(in, trash, sizeof trash);
while ((r > 0) && (!strchr(trash, '\n')));
}
if (!do_passwd(passed_salt, &passwd_config.salt,
&salt_malloc, passwd, out,
passwd_config.quiet, passwd_config.table,
passwd_config.reverse, pw_maxlen,
passwd_config.usecrypt, passwd_config.use1,
passwd_config.useapr1))
goto err;
}
done = (r <= 0);
} while (!done);
}
ret = 0;
err:
ERR_print_errors(bio_err);
free(salt_malloc);
free(passwd_malloc);
BIO_free(in);
BIO_free_all(out);
return (ret);
}
#ifndef NO_MD5CRYPT_1
/* MD5-based password algorithm (should probably be available as a library
* function; then the static buffer would not be acceptable).
* For magic string "1", this should be compatible to the MD5-based BSD
* password algorithm.
* For 'magic' string "apr1", this is compatible to the MD5-based Apache
* password algorithm.
* (Apparently, the Apache password algorithm is identical except that the
* 'magic' string was changed -- the laziest application of the NIH principle
* I've ever encountered.)
*/
static char *
md5crypt(const char *passwd, const char *magic, const char *salt)
{
static char out_buf[6 + 9 + 24 + 2]; /* "$apr1$..salt..$.......md5h
* ash..........\0" */
unsigned char buf[MD5_DIGEST_LENGTH];
char *salt_out;
int n;
unsigned int i;
EVP_MD_CTX *md = NULL, *md2 = NULL;
size_t passwd_len, salt_len;
passwd_len = strlen(passwd);
out_buf[0] = '$';
out_buf[1] = 0;
assert(strlen(magic) <= 4); /* "1" or "apr1" */
strlcat(out_buf, magic, sizeof(out_buf));
strlcat(out_buf, "$", sizeof(out_buf));
strlcat(out_buf, salt, sizeof(out_buf));
assert(strlen(out_buf) <= 6 + 8); /* "$apr1$..salt.." */
salt_out = out_buf + 2 + strlen(magic);
salt_len = strlen(salt_out);
assert(salt_len <= 8);
if ((md = EVP_MD_CTX_new()) == NULL)
goto err;
if (!EVP_DigestInit_ex(md, EVP_md5(), NULL))
goto err;
if (!EVP_DigestUpdate(md, passwd, passwd_len))
goto err;
if (!EVP_DigestUpdate(md, "$", 1))
goto err;
if (!EVP_DigestUpdate(md, magic, strlen(magic)))
goto err;
if (!EVP_DigestUpdate(md, "$", 1))
goto err;
if (!EVP_DigestUpdate(md, salt_out, salt_len))
goto err;
if ((md2 = EVP_MD_CTX_new()) == NULL)
goto err;
if (!EVP_DigestInit_ex(md2, EVP_md5(), NULL))
goto err;
if (!EVP_DigestUpdate(md2, passwd, passwd_len))
goto err;
if (!EVP_DigestUpdate(md2, salt_out, salt_len))
goto err;
if (!EVP_DigestUpdate(md2, passwd, passwd_len))
goto err;
if (!EVP_DigestFinal_ex(md2, buf, NULL))
goto err;
for (i = passwd_len; i > sizeof buf; i -= sizeof buf) {
if (!EVP_DigestUpdate(md, buf, sizeof buf))
goto err;
}
if (!EVP_DigestUpdate(md, buf, i))
goto err;
n = passwd_len;
while (n) {
if (!EVP_DigestUpdate(md, (n & 1) ? "\0" : passwd, 1))
goto err;
n >>= 1;
}
if (!EVP_DigestFinal_ex(md, buf, NULL))
goto err;
for (i = 0; i < 1000; i++) {
if (!EVP_DigestInit_ex(md2, EVP_md5(), NULL))
goto err;
if (!EVP_DigestUpdate(md2,
(i & 1) ? (unsigned const char *) passwd : buf,
(i & 1) ? passwd_len : sizeof buf))
goto err;
if (i % 3) {
if (!EVP_DigestUpdate(md2, salt_out, salt_len))
goto err;
}
if (i % 7) {
if (!EVP_DigestUpdate(md2, passwd, passwd_len))
goto err;
}
if (!EVP_DigestUpdate(md2,
(i & 1) ? buf : (unsigned const char *) passwd,
(i & 1) ? sizeof buf : passwd_len))
goto err;
if (!EVP_DigestFinal_ex(md2, buf, NULL))
goto err;
}
EVP_MD_CTX_free(md2);
md2 = NULL;
{
/* transform buf into output string */
unsigned char buf_perm[sizeof buf];
int dest, source;
char *output;
/* silly output permutation */
for (dest = 0, source = 0; dest < 14; dest++, source = (source + 6) % 17)
buf_perm[dest] = buf[source];
buf_perm[14] = buf[5];
buf_perm[15] = buf[11];
assert(16 == sizeof buf_perm);
output = salt_out + salt_len;
assert(output == out_buf + strlen(out_buf));
*output++ = '$';
for (i = 0; i < 15; i += 3) {
*output++ = cov_2char[buf_perm[i + 2] & 0x3f];
*output++ = cov_2char[((buf_perm[i + 1] & 0xf) << 2) |
(buf_perm[i + 2] >> 6)];
*output++ = cov_2char[((buf_perm[i] & 3) << 4) |
(buf_perm[i + 1] >> 4)];
*output++ = cov_2char[buf_perm[i] >> 2];
}
assert(i == 15);
*output++ = cov_2char[buf_perm[i] & 0x3f];
*output++ = cov_2char[buf_perm[i] >> 6];
*output = 0;
assert(strlen(out_buf) < sizeof(out_buf));
}
EVP_MD_CTX_free(md);
return out_buf;
err:
EVP_MD_CTX_free(md);
EVP_MD_CTX_free(md2);
return NULL;
}
#endif
static int
do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
char *passwd, BIO * out, int quiet, int table, int reverse,
size_t pw_maxlen, int usecrypt, int use1, int useapr1)
{
char *hash = NULL;
assert(salt_p != NULL);
assert(salt_malloc_p != NULL);
/* first make sure we have a salt */
if (!passed_salt) {
#ifndef OPENSSL_NO_DES
if (usecrypt) {
if (*salt_malloc_p == NULL) {
*salt_p = *salt_malloc_p = malloc(3);
if (*salt_malloc_p == NULL)
goto err;
}
arc4random_buf(*salt_p, 2);
(*salt_p)[0] = cov_2char[(*salt_p)[0] & 0x3f]; /* 6 bits */
(*salt_p)[1] = cov_2char[(*salt_p)[1] & 0x3f]; /* 6 bits */
(*salt_p)[2] = 0;
}
#endif /* !OPENSSL_NO_DES */
#ifndef NO_MD5CRYPT_1
if (use1 || useapr1) {
int i;
if (*salt_malloc_p == NULL) {
*salt_p = *salt_malloc_p = malloc(9);
if (*salt_malloc_p == NULL)
goto err;
}
arc4random_buf(*salt_p, 8);
for (i = 0; i < 8; i++)
(*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
(*salt_p)[8] = 0;
}
#endif /* !NO_MD5CRYPT_1 */
}
assert(*salt_p != NULL);
/* truncate password if necessary */
if ((strlen(passwd) > pw_maxlen)) {
if (!quiet)
BIO_printf(bio_err,
"Warning: truncating password to %zu characters\n",
pw_maxlen);
passwd[pw_maxlen] = 0;
}
assert(strlen(passwd) <= pw_maxlen);
/* now compute password hash */
#ifndef OPENSSL_NO_DES
if (usecrypt)
hash = DES_crypt(passwd, *salt_p);
#endif
#ifndef NO_MD5CRYPT_1
if (use1 || useapr1)
if ((hash = md5crypt(passwd, (use1 ? "1" : "apr1"), *salt_p)) == NULL)
goto err;
#endif
assert(hash != NULL);
if (table && !reverse)
BIO_printf(out, "%s\t%s\n", passwd, hash);
else if (table && reverse)
BIO_printf(out, "%s\t%s\n", hash, passwd);
else
BIO_printf(out, "%s\n", hash);
return 1;
err:
free(*salt_malloc_p);
*salt_malloc_p = NULL;
return 0;
}
#else
int
passwd_main(int argc, char **argv)
{
fputs("Program not available.\n", stderr)
return (1);
}
#endif
|