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d166ed8c11
openssl/apps/passwd.c
Dr. Stephen Henson d166ed8c11 check return values for EVP_Digest*() APIs 
Reviewed-by: Richard Levitte <levitte@openssl.org>
2016-07-15 14:09:05 +01:00

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/*
* Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#if defined OPENSSL_NO_MD5 || defined CHARSET_EBCDIC
# define NO_MD5CRYPT_1
#endif
#if !defined(OPENSSL_NO_DES) || !defined(NO_MD5CRYPT_1)
# include <string.h>
# include "apps.h"
# include <openssl/bio.h>
# include <openssl/err.h>
# include <openssl/evp.h>
# include <openssl/rand.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);
typedef enum OPTION_choice {
OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
OPT_IN,
OPT_NOVERIFY, OPT_QUIET, OPT_TABLE, OPT_REVERSE, OPT_APR1,
OPT_1, OPT_CRYPT, OPT_SALT, OPT_STDIN
} OPTION_CHOICE;
OPTIONS passwd_options[] = {
{"help", OPT_HELP, '-', "Display this summary"},
{"in", OPT_IN, '<', "Pead passwords from file"},
{"noverify", OPT_NOVERIFY, '-',
"Never verify when reading password from terminal"},
{"quiet", OPT_QUIET, '-', "No warnings"},
{"table", OPT_TABLE, '-', "Format output as table"},
{"reverse", OPT_REVERSE, '-', "Switch table columns"},
{"salt", OPT_SALT, 's', "Use provided salt"},
{"stdin", OPT_STDIN, '-', "Read passwords from stdin"},
# ifndef NO_MD5CRYPT_1
{"apr1", OPT_APR1, '-', "MD5-based password algorithm, Apache variant"},
{"1", OPT_1, '-', "MD5-based password algorithm"},
# endif
# ifndef OPENSSL_NO_DES
{"crypt", OPT_CRYPT, '-', "Standard Unix password algorithm (default)"},
# endif
{NULL}
};
int passwd_main(int argc, char **argv)
{
BIO *in = NULL;
char *infile = NULL, *salt = NULL, *passwd = NULL, **passwds = NULL;
char *salt_malloc = NULL, *passwd_malloc = NULL, *prog;
OPTION_CHOICE o;
int in_stdin = 0, pw_source_defined = 0;
#ifndef OPENSSL_NO_UI
int in_noverify = 0;
#endif
int passed_salt = 0, quiet = 0, table = 0, reverse = 0;
int ret = 1, usecrypt = 0, use1 = 0, useapr1 = 0;
size_t passwd_malloc_size = 0, pw_maxlen = 256;
prog = opt_init(argc, argv, passwd_options);
while ((o = opt_next()) != OPT_EOF) {
switch (o) {
case OPT_EOF:
case OPT_ERR:
opthelp:
BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
goto end;
case OPT_HELP:
opt_help(passwd_options);
ret = 0;
goto end;
case OPT_IN:
if (pw_source_defined)
goto opthelp;
infile = opt_arg();
pw_source_defined = 1;
break;
case OPT_NOVERIFY:
#ifndef OPENSSL_NO_UI
in_noverify = 1;
#endif
break;
case OPT_QUIET:
quiet = 1;
break;
case OPT_TABLE:
table = 1;
break;
case OPT_REVERSE:
reverse = 1;
break;
case OPT_1:
use1 = 1;
break;
case OPT_APR1:
useapr1 = 1;
break;
case OPT_CRYPT:
usecrypt = 1;
break;
case OPT_SALT:
passed_salt = 1;
salt = opt_arg();
break;
case OPT_STDIN:
if (pw_source_defined)
goto opthelp;
in_stdin = 1;
pw_source_defined = 1;
break;
}
}
argc = opt_num_rest();
argv = opt_rest();
if (*argv) {
if (pw_source_defined)
goto opthelp;
pw_source_defined = 1;
passwds = argv;
}
if (!usecrypt && !use1 && !useapr1) {
/* use default */
usecrypt = 1;
}
if (usecrypt + use1 + useapr1 > 1) {
/* conflict */
goto opthelp;
}
# ifdef OPENSSL_NO_DES
if (usecrypt)
goto opthelp;
# endif
# ifdef NO_MD5CRYPT_1
if (use1 || useapr1)
goto opthelp;
# endif
if (infile != NULL && in_stdin) {
BIO_printf(bio_err, "%s: Can't combine -in and -stdin\n", prog);
goto end;
}
if (infile != NULL || in_stdin) {
/*
* If in_stdin is true, we know that infile is NULL, and that
* bio_open_default() will give us back an alias for stdin.
*/
in = bio_open_default(infile, 'r', FORMAT_TEXT);
if (in == NULL)
goto end;
}
if (usecrypt)
pw_maxlen = 8;
else if (use1 || 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 =
app_malloc(passwd_malloc_size, "password buffer");
}
if ((in == NULL) && (passwds == NULL)) {
if (1) {
#ifndef OPENSSL_NO_UI
/* 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 || in_noverify)) != 0)
goto end;
passwds[0] = passwd_malloc;
} else {
#endif
BIO_printf(bio_err, "password required\n");
goto end;
}
}
if (in == NULL) {
assert(passwds != NULL);
assert(*passwds != NULL);
do { /* loop over list of passwords */
passwd = *passwds++;
if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, bio_out,
quiet, table, reverse, pw_maxlen, usecrypt, use1,
useapr1))
goto end;
}
while (*passwds != NULL);
} else
/* in != NULL */
{
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, &salt, &salt_malloc, passwd, bio_out, quiet,
table, reverse, pw_maxlen, usecrypt, use1, useapr1))
goto end;
}
done = (r <= 0);
}
while (!done);
}
ret = 0;
end:
ERR_print_errors(bio_err);
OPENSSL_free(salt_malloc);
OPENSSL_free(passwd_malloc);
BIO_free(in);
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)
{
/* "$apr1$..salt..$.......md5hash..........\0" */
static char out_buf[6 + 9 + 24 + 2];
unsigned char buf[MD5_DIGEST_LENGTH];
char *salt_out;
int n;
unsigned int i;
EVP_MD_CTX *md = NULL, *md2 = NULL;
size_t passwd_len, salt_len;
passwd_len = strlen(passwd);
out_buf[0] = '$';
out_buf[1] = 0;
assert(strlen(magic) <= 4); /* "1" or "apr1" */
OPENSSL_strlcat(out_buf, magic, sizeof out_buf);
OPENSSL_strlcat(out_buf, "$", sizeof out_buf);
OPENSSL_strlcat(out_buf, salt, sizeof out_buf);
assert(strlen(out_buf) <= 6 + 8); /* "$apr1$..salt.." */
salt_out = out_buf + 2 + strlen(magic);
salt_len = strlen(salt_out);
assert(salt_len <= 8);
md = EVP_MD_CTX_new();
if (md == NULL
|| !EVP_DigestInit_ex(md, EVP_md5(), NULL)
|| !EVP_DigestUpdate(md, passwd, passwd_len)
|| !EVP_DigestUpdate(md, "$", 1)
|| !EVP_DigestUpdate(md, magic, strlen(magic))
|| !EVP_DigestUpdate(md, "$", 1)
|| !EVP_DigestUpdate(md, salt_out, salt_len))
md2 = EVP_MD_CTX_new();
if (md2 == NULL
|| !EVP_DigestInit_ex(md2, EVP_md5(), NULL)
|| !EVP_DigestUpdate(md2, passwd, passwd_len)
|| !EVP_DigestUpdate(md2, salt_out, salt_len)
|| !EVP_DigestUpdate(md2, passwd, passwd_len)
|| !EVP_DigestFinal_ex(md2, buf, NULL))
goto err;
for (i = passwd_len; i > sizeof buf; i -= sizeof buf) {
if (!EVP_DigestUpdate(md, buf, sizeof buf))
goto err;
}
if (!EVP_DigestUpdate(md, buf, i))
goto err;
n = passwd_len;
while (n) {
if (!EVP_DigestUpdate(md, (n & 1) ? "\0" : passwd, 1))
goto err;
n >>= 1;
}
if (!EVP_DigestFinal_ex(md, buf, NULL))
return NULL;
for (i = 0; i < 1000; i++) {
if (!EVP_DigestInit_ex(md2, EVP_md5(), NULL))
goto err;
if (!EVP_DigestUpdate(md2,
(i & 1) ? (unsigned const char *)passwd : buf,
(i & 1) ? passwd_len : sizeof buf))
goto err;
if (i % 3) {
if (!EVP_DigestUpdate(md2, salt_out, salt_len))
goto err;
}
if (i % 7) {
if (!EVP_DigestUpdate(md2, passwd, passwd_len))
goto err;
}
if (!EVP_DigestUpdate(md2,
(i & 1) ? buf : (unsigned const char *)passwd,
(i & 1) ? sizeof buf : passwd_len))
goto err;
if (!EVP_DigestFinal_ex(md2, buf, NULL))
goto err;
}
EVP_MD_CTX_free(md2);
EVP_MD_CTX_free(md);
md2 = NULL;
md = NULL;
{
/* transform buf into output string */
unsigned char buf_perm[sizeof buf];
int dest, source;
char *output;
/* silly output permutation */
for (dest = 0, source = 0; dest < 14;
dest++, source = (source + 6) % 17)
buf_perm[dest] = buf[source];
buf_perm[14] = buf[5];
buf_perm[15] = buf[11];
# ifndef PEDANTIC /* Unfortunately, this generates a "no
* effect" warning */
assert(16 == sizeof buf_perm);
# endif
output = salt_out + salt_len;
assert(output == out_buf + strlen(out_buf));
*output++ = '$';
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));
}
return out_buf;
err:
EVP_MD_CTX_free(md2);
EVP_MD_CTX_free(md);
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 = app_malloc(3, "salt buffer");
}
if (RAND_bytes((unsigned char *)*salt_p, 2) <= 0)
goto end;
(*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;
# ifdef CHARSET_EBCDIC
ascii2ebcdic(*salt_p, *salt_p, 2); /* des_crypt will convert back
* to ASCII */
# endif
}
# endif /* !OPENSSL_NO_DES */
# ifndef NO_MD5CRYPT_1
if (use1 || useapr1) {
int i;
if (*salt_malloc_p == NULL) {
*salt_p = *salt_malloc_p = app_malloc(9, "salt buffer");
}
if (RAND_bytes((unsigned char *)*salt_p, 8) <= 0)
goto end;
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)
/*
* XXX: really we should know how to print a size_t, not cast it
*/
BIO_printf(bio_err,
"Warning: truncating password to %u characters\n",
(unsigned)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)
hash = md5crypt(passwd, (use1 ? "1" : "apr1"), *salt_p);
# 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 0;
end:
return 1;
}
#else
int passwd_main(int argc, char **argv)
{
BIO_printf(bio_err, "Program not available.\n");
return (1);
}
#endif
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