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021410ea3f
openssl/apps/enc.c
Rich Salz 021410ea3f Check non-option arguments 
Make sure all commands check to see if there are any "extra" arguments
after the options, and print an error if so.

Made all error messages consistent (which is to say, minimal).

Fixes: #13527

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/13563)
2020-12-15 11:47:17 +01:00

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/*
* Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (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
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "apps.h"
#include "progs.h"
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/rand.h>
#include <openssl/pem.h>
#ifndef OPENSSL_NO_COMP
# include <openssl/comp.h>
#endif
#include <ctype.h>
#undef SIZE
#undef BSIZE
#define SIZE (512)
#define BSIZE (8*1024)
static int set_hex(const char *in, unsigned char *out, int size);
static void show_ciphers(const OBJ_NAME *name, void *bio_);
struct doall_enc_ciphers {
BIO *bio;
int n;
};
typedef enum OPTION_choice {
OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
OPT_LIST,
OPT_E, OPT_IN, OPT_OUT, OPT_PASS, OPT_ENGINE, OPT_D, OPT_P, OPT_V,
OPT_NOPAD, OPT_SALT, OPT_NOSALT, OPT_DEBUG, OPT_UPPER_P, OPT_UPPER_A,
OPT_A, OPT_Z, OPT_BUFSIZE, OPT_K, OPT_KFILE, OPT_UPPER_K, OPT_NONE,
OPT_UPPER_S, OPT_IV, OPT_MD, OPT_ITER, OPT_PBKDF2, OPT_CIPHER,
OPT_R_ENUM, OPT_PROV_ENUM
} OPTION_CHOICE;
const OPTIONS enc_options[] = {
OPT_SECTION("General"),
{"help", OPT_HELP, '-', "Display this summary"},
{"list", OPT_LIST, '-', "List ciphers"},
#ifndef OPENSSL_NO_DEPRECATED_3_0
{"ciphers", OPT_LIST, '-', "Alias for -list"},
#endif
{"e", OPT_E, '-', "Encrypt"},
{"d", OPT_D, '-', "Decrypt"},
{"p", OPT_P, '-', "Print the iv/key"},
{"P", OPT_UPPER_P, '-', "Print the iv/key and exit"},
#ifndef OPENSSL_NO_ENGINE
{"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
#endif
OPT_SECTION("Input"),
{"in", OPT_IN, '<', "Input file"},
{"k", OPT_K, 's', "Passphrase"},
{"kfile", OPT_KFILE, '<', "Read passphrase from file"},
OPT_SECTION("Output"),
{"out", OPT_OUT, '>', "Output file"},
{"pass", OPT_PASS, 's', "Passphrase source"},
{"v", OPT_V, '-', "Verbose output"},
{"a", OPT_A, '-', "Base64 encode/decode, depending on encryption flag"},
{"base64", OPT_A, '-', "Same as option -a"},
{"A", OPT_UPPER_A, '-',
"Used with -[base64|a] to specify base64 buffer as a single line"},
OPT_SECTION("Encryption"),
{"nopad", OPT_NOPAD, '-', "Disable standard block padding"},
{"salt", OPT_SALT, '-', "Use salt in the KDF (default)"},
{"nosalt", OPT_NOSALT, '-', "Do not use salt in the KDF"},
{"debug", OPT_DEBUG, '-', "Print debug info"},
{"bufsize", OPT_BUFSIZE, 's', "Buffer size"},
{"K", OPT_UPPER_K, 's', "Raw key, in hex"},
{"S", OPT_UPPER_S, 's', "Salt, in hex"},
{"iv", OPT_IV, 's', "IV in hex"},
{"md", OPT_MD, 's', "Use specified digest to create a key from the passphrase"},
{"iter", OPT_ITER, 'p', "Specify the iteration count and force use of PBKDF2"},
{"pbkdf2", OPT_PBKDF2, '-', "Use password-based key derivation function 2"},
{"none", OPT_NONE, '-', "Don't encrypt"},
#ifdef ZLIB
{"z", OPT_Z, '-', "Use zlib as the 'encryption'"},
#endif
{"", OPT_CIPHER, '-', "Any supported cipher"},
OPT_R_OPTIONS,
OPT_PROV_OPTIONS,
{NULL}
};
int enc_main(int argc, char **argv)
{
static char buf[128];
static const char magic[] = "Salted__";
ENGINE *e = NULL;
BIO *in = NULL, *out = NULL, *b64 = NULL, *benc = NULL, *rbio =
NULL, *wbio = NULL;
EVP_CIPHER_CTX *ctx = NULL;
const EVP_CIPHER *cipher = NULL, *c;
const EVP_MD *dgst = NULL;
char *hkey = NULL, *hiv = NULL, *hsalt = NULL, *p;
char *infile = NULL, *outfile = NULL, *prog;
char *str = NULL, *passarg = NULL, *pass = NULL, *strbuf = NULL;
char mbuf[sizeof(magic) - 1];
OPTION_CHOICE o;
int bsize = BSIZE, verbose = 0, debug = 0, olb64 = 0, nosalt = 0;
int enc = 1, printkey = 0, i, k;
int base64 = 0, informat = FORMAT_BINARY, outformat = FORMAT_BINARY;
int ret = 1, inl, nopad = 0;
unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
unsigned char *buff = NULL, salt[PKCS5_SALT_LEN];
int pbkdf2 = 0;
int iter = 0;
long n;
struct doall_enc_ciphers dec;
#ifdef ZLIB
int do_zlib = 0;
BIO *bzl = NULL;
#endif
/* first check the program name */
prog = opt_progname(argv[0]);
if (strcmp(prog, "base64") == 0) {
base64 = 1;
#ifdef ZLIB
} else if (strcmp(prog, "zlib") == 0) {
do_zlib = 1;
#endif
} else {
cipher = EVP_get_cipherbyname(prog);
if (cipher == NULL && strcmp(prog, "enc") != 0) {
BIO_printf(bio_err, "%s is not a known cipher\n", prog);
goto end;
}
}
prog = opt_init(argc, argv, enc_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(enc_options);
ret = 0;
goto end;
case OPT_LIST:
BIO_printf(bio_out, "Supported ciphers:\n");
dec.bio = bio_out;
dec.n = 0;
OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH,
show_ciphers, &dec);
BIO_printf(bio_out, "\n");
ret = 0;
goto end;
case OPT_E:
enc = 1;
break;
case OPT_IN:
infile = opt_arg();
break;
case OPT_OUT:
outfile = opt_arg();
break;
case OPT_PASS:
passarg = opt_arg();
break;
case OPT_ENGINE:
e = setup_engine(opt_arg(), 0);
break;
case OPT_D:
enc = 0;
break;
case OPT_P:
printkey = 1;
break;
case OPT_V:
verbose = 1;
break;
case OPT_NOPAD:
nopad = 1;
break;
case OPT_SALT:
nosalt = 0;
break;
case OPT_NOSALT:
nosalt = 1;
break;
case OPT_DEBUG:
debug = 1;
break;
case OPT_UPPER_P:
printkey = 2;
break;
case OPT_UPPER_A:
olb64 = 1;
break;
case OPT_A:
base64 = 1;
break;
case OPT_Z:
#ifdef ZLIB
do_zlib = 1;
#endif
break;
case OPT_BUFSIZE:
p = opt_arg();
i = (int)strlen(p) - 1;
k = i >= 1 && p[i] == 'k';
if (k)
p[i] = '\0';
if (!opt_long(opt_arg(), &n)
|| n < 0 || (k && n >= LONG_MAX / 1024))
goto opthelp;
if (k)
n *= 1024;
bsize = (int)n;
break;
case OPT_K:
str = opt_arg();
break;
case OPT_KFILE:
in = bio_open_default(opt_arg(), 'r', FORMAT_TEXT);
if (in == NULL)
goto opthelp;
i = BIO_gets(in, buf, sizeof(buf));
BIO_free(in);
in = NULL;
if (i <= 0) {
BIO_printf(bio_err,
"%s Can't read key from %s\n", prog, opt_arg());
goto opthelp;
}
while (--i > 0 && (buf[i] == '\r' || buf[i] == '\n'))
buf[i] = '\0';
if (i <= 0) {
BIO_printf(bio_err, "%s: zero length password\n", prog);
goto opthelp;
}
str = buf;
break;
case OPT_UPPER_K:
hkey = opt_arg();
break;
case OPT_UPPER_S:
hsalt = opt_arg();
break;
case OPT_IV:
hiv = opt_arg();
break;
case OPT_MD:
if (!opt_md(opt_arg(), &dgst))
goto opthelp;
break;
case OPT_CIPHER:
if (!opt_cipher(opt_unknown(), &c))
goto opthelp;
cipher = c;
break;
case OPT_ITER:
if (!opt_int(opt_arg(), &iter))
goto opthelp;
pbkdf2 = 1;
break;
case OPT_PBKDF2:
pbkdf2 = 1;
if (iter == 0) /* do not overwrite a chosen value */
iter = 10000;
break;
case OPT_NONE:
cipher = NULL;
break;
case OPT_R_CASES:
if (!opt_rand(o))
goto end;
break;
case OPT_PROV_CASES:
if (!opt_provider(o))
goto end;
break;
}
}
/* No extra arguments. */
argc = opt_num_rest();
if (argc != 0)
goto opthelp;
if (cipher && EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) {
BIO_printf(bio_err, "%s: AEAD ciphers not supported\n", prog);
goto end;
}
if (cipher && (EVP_CIPHER_mode(cipher) == EVP_CIPH_XTS_MODE)) {
BIO_printf(bio_err, "%s XTS ciphers not supported\n", prog);
goto end;
}
if (dgst == NULL)
dgst = EVP_sha256();
if (iter == 0)
iter = 1;
/* It must be large enough for a base64 encoded line */
if (base64 && bsize < 80)
bsize = 80;
if (verbose)
BIO_printf(bio_err, "bufsize=%d\n", bsize);
#ifdef ZLIB
if (!do_zlib)
#endif
if (base64) {
if (enc)
outformat = FORMAT_BASE64;
else
informat = FORMAT_BASE64;
}
strbuf = app_malloc(SIZE, "strbuf");
buff = app_malloc(EVP_ENCODE_LENGTH(bsize), "evp buffer");
if (infile == NULL) {
in = dup_bio_in(informat);
} else {
in = bio_open_default(infile, 'r', informat);
}
if (in == NULL)
goto end;
if (str == NULL && passarg != NULL) {
if (!app_passwd(passarg, NULL, &pass, NULL)) {
BIO_printf(bio_err, "Error getting password\n");
goto end;
}
str = pass;
}
if ((str == NULL) && (cipher != NULL) && (hkey == NULL)) {
if (1) {
#ifndef OPENSSL_NO_UI_CONSOLE
for (;;) {
char prompt[200];
BIO_snprintf(prompt, sizeof(prompt), "enter %s %s password:",
OBJ_nid2ln(EVP_CIPHER_nid(cipher)),
(enc) ? "encryption" : "decryption");
strbuf[0] = '\0';
i = EVP_read_pw_string((char *)strbuf, SIZE, prompt, enc);
if (i == 0) {
if (strbuf[0] == '\0') {
ret = 1;
goto end;
}
str = strbuf;
break;
}
if (i < 0) {
BIO_printf(bio_err, "bad password read\n");
goto end;
}
}
} else {
#endif
BIO_printf(bio_err, "password required\n");
goto end;
}
}
out = bio_open_default(outfile, 'w', outformat);
if (out == NULL)
goto end;
if (debug) {
BIO_set_callback(in, BIO_debug_callback);
BIO_set_callback(out, BIO_debug_callback);
BIO_set_callback_arg(in, (char *)bio_err);
BIO_set_callback_arg(out, (char *)bio_err);
}
rbio = in;
wbio = out;
#ifdef ZLIB
if (do_zlib) {
if ((bzl = BIO_new(BIO_f_zlib())) == NULL)
goto end;
if (debug) {
BIO_set_callback(bzl, BIO_debug_callback);
BIO_set_callback_arg(bzl, (char *)bio_err);
}
if (enc)
wbio = BIO_push(bzl, wbio);
else
rbio = BIO_push(bzl, rbio);
}
#endif
if (base64) {
if ((b64 = BIO_new(BIO_f_base64())) == NULL)
goto end;
if (debug) {
BIO_set_callback(b64, BIO_debug_callback);
BIO_set_callback_arg(b64, (char *)bio_err);
}
if (olb64)
BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
if (enc)
wbio = BIO_push(b64, wbio);
else
rbio = BIO_push(b64, rbio);
}
if (cipher != NULL) {
/*
* Note that str is NULL if a key was passed on the command line, so
* we get no salt in that case. Is this a bug?
*/
if (str != NULL) {
/*
* Salt handling: if encrypting generate a salt and write to
* output BIO. If decrypting read salt from input BIO.
*/
unsigned char *sptr;
size_t str_len = strlen(str);
if (nosalt) {
sptr = NULL;
} else {
if (enc) {
if (hsalt) {
if (!set_hex(hsalt, salt, sizeof(salt))) {
BIO_printf(bio_err, "invalid hex salt value\n");
goto end;
}
} else if (RAND_bytes(salt, sizeof(salt)) <= 0) {
goto end;
}
/*
* If -P option then don't bother writing
*/
if ((printkey != 2)
&& (BIO_write(wbio, magic,
sizeof(magic) - 1) != sizeof(magic) - 1
|| BIO_write(wbio,
(char *)salt,
sizeof(salt)) != sizeof(salt))) {
BIO_printf(bio_err, "error writing output file\n");
goto end;
}
} else if (BIO_read(rbio, mbuf, sizeof(mbuf)) != sizeof(mbuf)
|| BIO_read(rbio,
(unsigned char *)salt,
sizeof(salt)) != sizeof(salt)) {
BIO_printf(bio_err, "error reading input file\n");
goto end;
} else if (memcmp(mbuf, magic, sizeof(magic) - 1)) {
BIO_printf(bio_err, "bad magic number\n");
goto end;
}
sptr = salt;
}
if (pbkdf2 == 1) {
/*
* derive key and default iv
* concatenated into a temporary buffer
*/
unsigned char tmpkeyiv[EVP_MAX_KEY_LENGTH + EVP_MAX_IV_LENGTH];
int iklen = EVP_CIPHER_key_length(cipher);
int ivlen = EVP_CIPHER_iv_length(cipher);
/* not needed if HASH_UPDATE() is fixed : */
int islen = (sptr != NULL ? sizeof(salt) : 0);
if (!PKCS5_PBKDF2_HMAC(str, str_len, sptr, islen,
iter, dgst, iklen+ivlen, tmpkeyiv)) {
BIO_printf(bio_err, "PKCS5_PBKDF2_HMAC failed\n");
goto end;
}
/* split and move data back to global buffer */
memcpy(key, tmpkeyiv, iklen);
memcpy(iv, tmpkeyiv+iklen, ivlen);
} else {
BIO_printf(bio_err, "*** WARNING : "
"deprecated key derivation used.\n"
"Using -iter or -pbkdf2 would be better.\n");
if (!EVP_BytesToKey(cipher, dgst, sptr,
(unsigned char *)str, str_len,
1, key, iv)) {
BIO_printf(bio_err, "EVP_BytesToKey failed\n");
goto end;
}
}
/*
* zero the complete buffer or the string passed from the command
* line.
*/
if (str == strbuf)
OPENSSL_cleanse(str, SIZE);
else
OPENSSL_cleanse(str, str_len);
}
if (hiv != NULL) {
int siz = EVP_CIPHER_iv_length(cipher);
if (siz == 0) {
BIO_printf(bio_err, "warning: iv not used by this cipher\n");
} else if (!set_hex(hiv, iv, siz)) {
BIO_printf(bio_err, "invalid hex iv value\n");
goto end;
}
}
if ((hiv == NULL) && (str == NULL)
&& EVP_CIPHER_iv_length(cipher) != 0) {
/*
* No IV was explicitly set and no IV was generated.
* Hence the IV is undefined, making correct decryption impossible.
*/
BIO_printf(bio_err, "iv undefined\n");
goto end;
}
if (hkey != NULL) {
if (!set_hex(hkey, key, EVP_CIPHER_key_length(cipher))) {
BIO_printf(bio_err, "invalid hex key value\n");
goto end;
}
/* wiping secret data as we no longer need it */
cleanse(hkey);
}
if ((benc = BIO_new(BIO_f_cipher())) == NULL)
goto end;
/*
* Since we may be changing parameters work on the encryption context
* rather than calling BIO_set_cipher().
*/
BIO_get_cipher_ctx(benc, &ctx);
if (!EVP_CipherInit_ex(ctx, cipher, e, NULL, NULL, enc)) {
BIO_printf(bio_err, "Error setting cipher %s\n",
EVP_CIPHER_name(cipher));
ERR_print_errors(bio_err);
goto end;
}
if (nopad)
EVP_CIPHER_CTX_set_padding(ctx, 0);
if (!EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, enc)) {
BIO_printf(bio_err, "Error setting cipher %s\n",
EVP_CIPHER_name(cipher));
ERR_print_errors(bio_err);
goto end;
}
if (debug) {
BIO_set_callback(benc, BIO_debug_callback);
BIO_set_callback_arg(benc, (char *)bio_err);
}
if (printkey) {
if (!nosalt) {
printf("salt=");
for (i = 0; i < (int)sizeof(salt); i++)
printf("%02X", salt[i]);
printf("\n");
}
if (EVP_CIPHER_key_length(cipher) > 0) {
printf("key=");
for (i = 0; i < EVP_CIPHER_key_length(cipher); i++)
printf("%02X", key[i]);
printf("\n");
}
if (EVP_CIPHER_iv_length(cipher) > 0) {
printf("iv =");
for (i = 0; i < EVP_CIPHER_iv_length(cipher); i++)
printf("%02X", iv[i]);
printf("\n");
}
if (printkey == 2) {
ret = 0;
goto end;
}
}
}
/* Only encrypt/decrypt as we write the file */
if (benc != NULL)
wbio = BIO_push(benc, wbio);
while (BIO_pending(rbio) || !BIO_eof(rbio)) {
inl = BIO_read(rbio, (char *)buff, bsize);
if (inl <= 0)
break;
if (BIO_write(wbio, (char *)buff, inl) != inl) {
BIO_printf(bio_err, "error writing output file\n");
goto end;
}
}
if (!BIO_flush(wbio)) {
BIO_printf(bio_err, "bad decrypt\n");
goto end;
}
ret = 0;
if (verbose) {
BIO_printf(bio_err, "bytes read : %8ju\n", BIO_number_read(in));
BIO_printf(bio_err, "bytes written: %8ju\n", BIO_number_written(out));
}
end:
ERR_print_errors(bio_err);
OPENSSL_free(strbuf);
OPENSSL_free(buff);
BIO_free(in);
BIO_free_all(out);
BIO_free(benc);
BIO_free(b64);
#ifdef ZLIB
BIO_free(bzl);
#endif
release_engine(e);
OPENSSL_free(pass);
return ret;
}
static void show_ciphers(const OBJ_NAME *name, void *arg)
{
struct doall_enc_ciphers *dec = (struct doall_enc_ciphers *)arg;
const EVP_CIPHER *cipher;
if (!islower((unsigned char)*name->name))
return;
/* Filter out ciphers that we cannot use */
cipher = EVP_get_cipherbyname(name->name);
if (cipher == NULL ||
(EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) != 0 ||
EVP_CIPHER_mode(cipher) == EVP_CIPH_XTS_MODE)
return;
BIO_printf(dec->bio, "-%-25s", name->name);
if (++dec->n == 3) {
BIO_printf(dec->bio, "\n");
dec->n = 0;
} else
BIO_printf(dec->bio, " ");
}
static int set_hex(const char *in, unsigned char *out, int size)
{
int i, n;
unsigned char j;
i = size * 2;
n = strlen(in);
if (n > i) {
BIO_printf(bio_err, "hex string is too long, ignoring excess\n");
n = i; /* ignore exceeding part */
} else if (n < i) {
BIO_printf(bio_err, "hex string is too short, padding with zero bytes to length\n");
}
memset(out, 0, size);
for (i = 0; i < n; i++) {
j = (unsigned char)*in++;
if (!isxdigit(j)) {
BIO_printf(bio_err, "non-hex digit\n");
return 0;
}
j = (unsigned char)OPENSSL_hexchar2int(j);
if (i & 1)
out[i / 2] |= j;
else
out[i / 2] = (j << 4);
}
return 1;
}
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