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openssl/engines/e_ossltest.c
Dr. Stephen Henson c57c32a8b1 Add predicatable RAND_METHOD to test ENGINE 
The test ENGINE effectively used a predictable PRNG because it supplied
a bogus implementation of SHA256 which the old version of OpenSSL's PRNG
used. The new DRBG does not use SHA256 so it is no longer predictable
if the SHA256 implementation is replaced. Use an explicit predictable
PRNG instead.

Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
(Merged from https://github.com/openssl/openssl/pull/4098)
2017-08-06 19:24:32 +01:00

691 lines
20 KiB
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/*
* Copyright 2015-2016 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
*/
/*
* This is the OSSLTEST engine. It provides deliberately crippled digest
* implementations for test purposes. It is highly insecure and must NOT be
* used for any purpose except testing
*/
#include <stdio.h>
#include <string.h>
#include <openssl/engine.h>
#include <openssl/sha.h>
#include <openssl/md5.h>
#include <openssl/rsa.h>
#include <openssl/evp.h>
#include <openssl/modes.h>
#include <openssl/aes.h>
#include <openssl/rand.h>
#include <openssl/crypto.h>
#include "e_ossltest_err.c"
/* Engine Id and Name */
static const char *engine_ossltest_id = "ossltest";
static const char *engine_ossltest_name = "OpenSSL Test engine support";
/* Engine Lifetime functions */
static int ossltest_destroy(ENGINE *e);
static int ossltest_init(ENGINE *e);
static int ossltest_finish(ENGINE *e);
void ENGINE_load_ossltest(void);
/* Set up digests */
static int ossltest_digests(ENGINE *e, const EVP_MD **digest,
const int **nids, int nid);
static const RAND_METHOD *ossltest_rand_method(void);
/* MD5 */
static int digest_md5_init(EVP_MD_CTX *ctx);
static int digest_md5_update(EVP_MD_CTX *ctx, const void *data,
size_t count);
static int digest_md5_final(EVP_MD_CTX *ctx, unsigned char *md);
static EVP_MD *_hidden_md5_md = NULL;
static const EVP_MD *digest_md5(void)
{
if (_hidden_md5_md == NULL) {
EVP_MD *md;
if ((md = EVP_MD_meth_new(NID_md5, NID_md5WithRSAEncryption)) == NULL
|| !EVP_MD_meth_set_result_size(md, MD5_DIGEST_LENGTH)
|| !EVP_MD_meth_set_input_blocksize(md, MD5_CBLOCK)
|| !EVP_MD_meth_set_app_datasize(md,
sizeof(EVP_MD *) + sizeof(MD5_CTX))
|| !EVP_MD_meth_set_flags(md, 0)
|| !EVP_MD_meth_set_init(md, digest_md5_init)
|| !EVP_MD_meth_set_update(md, digest_md5_update)
|| !EVP_MD_meth_set_final(md, digest_md5_final)) {
EVP_MD_meth_free(md);
md = NULL;
}
_hidden_md5_md = md;
}
return _hidden_md5_md;
}
/* SHA1 */
static int digest_sha1_init(EVP_MD_CTX *ctx);
static int digest_sha1_update(EVP_MD_CTX *ctx, const void *data,
size_t count);
static int digest_sha1_final(EVP_MD_CTX *ctx, unsigned char *md);
static EVP_MD *_hidden_sha1_md = NULL;
static const EVP_MD *digest_sha1(void)
{
if (_hidden_sha1_md == NULL) {
EVP_MD *md;
if ((md = EVP_MD_meth_new(NID_sha1, NID_sha1WithRSAEncryption)) == NULL
|| !EVP_MD_meth_set_result_size(md, SHA_DIGEST_LENGTH)
|| !EVP_MD_meth_set_input_blocksize(md, SHA_CBLOCK)
|| !EVP_MD_meth_set_app_datasize(md,
sizeof(EVP_MD *) + sizeof(SHA_CTX))
|| !EVP_MD_meth_set_flags(md, EVP_MD_FLAG_DIGALGID_ABSENT)
|| !EVP_MD_meth_set_init(md, digest_sha1_init)
|| !EVP_MD_meth_set_update(md, digest_sha1_update)
|| !EVP_MD_meth_set_final(md, digest_sha1_final)) {
EVP_MD_meth_free(md);
md = NULL;
}
_hidden_sha1_md = md;
}
return _hidden_sha1_md;
}
/* SHA256 */
static int digest_sha256_init(EVP_MD_CTX *ctx);
static int digest_sha256_update(EVP_MD_CTX *ctx, const void *data,
size_t count);
static int digest_sha256_final(EVP_MD_CTX *ctx, unsigned char *md);
static EVP_MD *_hidden_sha256_md = NULL;
static const EVP_MD *digest_sha256(void)
{
if (_hidden_sha256_md == NULL) {
EVP_MD *md;
if ((md = EVP_MD_meth_new(NID_sha256, NID_sha256WithRSAEncryption)) == NULL
|| !EVP_MD_meth_set_result_size(md, SHA256_DIGEST_LENGTH)
|| !EVP_MD_meth_set_input_blocksize(md, SHA256_CBLOCK)
|| !EVP_MD_meth_set_app_datasize(md,
sizeof(EVP_MD *) + sizeof(SHA256_CTX))
|| !EVP_MD_meth_set_flags(md, EVP_MD_FLAG_DIGALGID_ABSENT)
|| !EVP_MD_meth_set_init(md, digest_sha256_init)
|| !EVP_MD_meth_set_update(md, digest_sha256_update)
|| !EVP_MD_meth_set_final(md, digest_sha256_final)) {
EVP_MD_meth_free(md);
md = NULL;
}
_hidden_sha256_md = md;
}
return _hidden_sha256_md;
}
/* SHA384/SHA512 */
static int digest_sha384_init(EVP_MD_CTX *ctx);
static int digest_sha512_init(EVP_MD_CTX *ctx);
static int digest_sha512_update(EVP_MD_CTX *ctx, const void *data,
size_t count);
static int digest_sha384_final(EVP_MD_CTX *ctx, unsigned char *md);
static int digest_sha512_final(EVP_MD_CTX *ctx, unsigned char *md);
static EVP_MD *_hidden_sha384_md = NULL;
static const EVP_MD *digest_sha384(void)
{
if (_hidden_sha384_md == NULL) {
EVP_MD *md;
if ((md = EVP_MD_meth_new(NID_sha384, NID_sha384WithRSAEncryption)) == NULL
|| !EVP_MD_meth_set_result_size(md, SHA384_DIGEST_LENGTH)
|| !EVP_MD_meth_set_input_blocksize(md, SHA512_CBLOCK)
|| !EVP_MD_meth_set_app_datasize(md,
sizeof(EVP_MD *) + sizeof(SHA512_CTX))
|| !EVP_MD_meth_set_flags(md, EVP_MD_FLAG_DIGALGID_ABSENT)
|| !EVP_MD_meth_set_init(md, digest_sha384_init)
|| !EVP_MD_meth_set_update(md, digest_sha512_update)
|| !EVP_MD_meth_set_final(md, digest_sha384_final)) {
EVP_MD_meth_free(md);
md = NULL;
}
_hidden_sha384_md = md;
}
return _hidden_sha384_md;
}
static EVP_MD *_hidden_sha512_md = NULL;
static const EVP_MD *digest_sha512(void)
{
if (_hidden_sha512_md == NULL) {
EVP_MD *md;
if ((md = EVP_MD_meth_new(NID_sha512, NID_sha512WithRSAEncryption)) == NULL
|| !EVP_MD_meth_set_result_size(md, SHA512_DIGEST_LENGTH)
|| !EVP_MD_meth_set_input_blocksize(md, SHA512_CBLOCK)
|| !EVP_MD_meth_set_app_datasize(md,
sizeof(EVP_MD *) + sizeof(SHA512_CTX))
|| !EVP_MD_meth_set_flags(md, EVP_MD_FLAG_DIGALGID_ABSENT)
|| !EVP_MD_meth_set_init(md, digest_sha512_init)
|| !EVP_MD_meth_set_update(md, digest_sha512_update)
|| !EVP_MD_meth_set_final(md, digest_sha512_final)) {
EVP_MD_meth_free(md);
md = NULL;
}
_hidden_sha512_md = md;
}
return _hidden_sha512_md;
}
static void destroy_digests(void)
{
EVP_MD_meth_free(_hidden_md5_md);
_hidden_md5_md = NULL;
EVP_MD_meth_free(_hidden_sha1_md);
_hidden_sha1_md = NULL;
EVP_MD_meth_free(_hidden_sha256_md);
_hidden_sha256_md = NULL;
EVP_MD_meth_free(_hidden_sha384_md);
_hidden_sha384_md = NULL;
EVP_MD_meth_free(_hidden_sha512_md);
_hidden_sha512_md = NULL;
}
static int ossltest_digest_nids(const int **nids)
{
static int digest_nids[6] = { 0, 0, 0, 0, 0, 0 };
static int pos = 0;
static int init = 0;
if (!init) {
const EVP_MD *md;
if ((md = digest_md5()) != NULL)
digest_nids[pos++] = EVP_MD_type(md);
if ((md = digest_sha1()) != NULL)
digest_nids[pos++] = EVP_MD_type(md);
if ((md = digest_sha256()) != NULL)
digest_nids[pos++] = EVP_MD_type(md);
if ((md = digest_sha384()) != NULL)
digest_nids[pos++] = EVP_MD_type(md);
if ((md = digest_sha512()) != NULL)
digest_nids[pos++] = EVP_MD_type(md);
digest_nids[pos] = 0;
init = 1;
}
*nids = digest_nids;
return pos;
}
/* Setup ciphers */
static int ossltest_ciphers(ENGINE *, const EVP_CIPHER **,
const int **, int);
static int ossltest_cipher_nids[] = {
NID_aes_128_cbc, NID_aes_128_gcm, 0
};
/* AES128 */
int ossltest_aes128_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc);
int ossltest_aes128_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl);
int ossltest_aes128_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc);
int ossltest_aes128_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl);
static int ossltest_aes128_gcm_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
void *ptr);
static EVP_CIPHER *_hidden_aes_128_cbc = NULL;
static const EVP_CIPHER *ossltest_aes_128_cbc(void)
{
if (_hidden_aes_128_cbc == NULL
&& ((_hidden_aes_128_cbc = EVP_CIPHER_meth_new(NID_aes_128_cbc,
16 /* block size */,
16 /* key len */)) == NULL
|| !EVP_CIPHER_meth_set_iv_length(_hidden_aes_128_cbc,16)
|| !EVP_CIPHER_meth_set_flags(_hidden_aes_128_cbc,
EVP_CIPH_FLAG_DEFAULT_ASN1
| EVP_CIPH_CBC_MODE)
|| !EVP_CIPHER_meth_set_init(_hidden_aes_128_cbc,
ossltest_aes128_init_key)
|| !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_128_cbc,
ossltest_aes128_cbc_cipher)
|| !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_128_cbc,
EVP_CIPHER_impl_ctx_size(EVP_aes_128_cbc())))) {
EVP_CIPHER_meth_free(_hidden_aes_128_cbc);
_hidden_aes_128_cbc = NULL;
}
return _hidden_aes_128_cbc;
}
static EVP_CIPHER *_hidden_aes_128_gcm = NULL;
#define AES_GCM_FLAGS (EVP_CIPH_FLAG_DEFAULT_ASN1 \
| EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER \
| EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT \
| EVP_CIPH_CUSTOM_COPY |EVP_CIPH_FLAG_AEAD_CIPHER \
| EVP_CIPH_GCM_MODE)
static const EVP_CIPHER *ossltest_aes_128_gcm(void)
{
if (_hidden_aes_128_gcm == NULL
&& ((_hidden_aes_128_gcm = EVP_CIPHER_meth_new(NID_aes_128_gcm,
1 /* block size */,
16 /* key len */)) == NULL
|| !EVP_CIPHER_meth_set_iv_length(_hidden_aes_128_gcm,12)
|| !EVP_CIPHER_meth_set_flags(_hidden_aes_128_gcm, AES_GCM_FLAGS)
|| !EVP_CIPHER_meth_set_init(_hidden_aes_128_gcm,
ossltest_aes128_gcm_init_key)
|| !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_128_gcm,
ossltest_aes128_gcm_cipher)
|| !EVP_CIPHER_meth_set_ctrl(_hidden_aes_128_gcm,
ossltest_aes128_gcm_ctrl)
|| !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_128_gcm,
EVP_CIPHER_impl_ctx_size(EVP_aes_128_gcm())))) {
EVP_CIPHER_meth_free(_hidden_aes_128_gcm);
_hidden_aes_128_gcm = NULL;
}
return _hidden_aes_128_gcm;
}
static void destroy_ciphers(void)
{
EVP_CIPHER_meth_free(_hidden_aes_128_cbc);
EVP_CIPHER_meth_free(_hidden_aes_128_gcm);
_hidden_aes_128_cbc = NULL;
}
static int bind_ossltest(ENGINE *e)
{
/* Ensure the ossltest error handling is set up */
ERR_load_OSSLTEST_strings();
if (!ENGINE_set_id(e, engine_ossltest_id)
|| !ENGINE_set_name(e, engine_ossltest_name)
|| !ENGINE_set_digests(e, ossltest_digests)
|| !ENGINE_set_ciphers(e, ossltest_ciphers)
|| !ENGINE_set_RAND(e, ossltest_rand_method())
|| !ENGINE_set_destroy_function(e, ossltest_destroy)
|| !ENGINE_set_init_function(e, ossltest_init)
|| !ENGINE_set_finish_function(e, ossltest_finish)) {
OSSLTESTerr(OSSLTEST_F_BIND_OSSLTEST, OSSLTEST_R_INIT_FAILED);
return 0;
}
return 1;
}
#ifndef OPENSSL_NO_DYNAMIC_ENGINE
static int bind_helper(ENGINE *e, const char *id)
{
if (id && (strcmp(id, engine_ossltest_id) != 0))
return 0;
if (!bind_ossltest(e))
return 0;
return 1;
}
IMPLEMENT_DYNAMIC_CHECK_FN()
IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
#endif
static ENGINE *engine_ossltest(void)
{
ENGINE *ret = ENGINE_new();
if (ret == NULL)
return NULL;
if (!bind_ossltest(ret)) {
ENGINE_free(ret);
return NULL;
}
return ret;
}
void ENGINE_load_ossltest(void)
{
/* Copied from eng_[openssl|dyn].c */
ENGINE *toadd = engine_ossltest();
if (!toadd)
return;
ENGINE_add(toadd);
ENGINE_free(toadd);
ERR_clear_error();
}
static int ossltest_init(ENGINE *e)
{
return 1;
}
static int ossltest_finish(ENGINE *e)
{
return 1;
}
static int ossltest_destroy(ENGINE *e)
{
destroy_digests();
destroy_ciphers();
ERR_unload_OSSLTEST_strings();
return 1;
}
static int ossltest_digests(ENGINE *e, const EVP_MD **digest,
const int **nids, int nid)
{
int ok = 1;
if (!digest) {
/* We are returning a list of supported nids */
return ossltest_digest_nids(nids);
}
/* We are being asked for a specific digest */
switch (nid) {
case NID_md5:
*digest = digest_md5();
break;
case NID_sha1:
*digest = digest_sha1();
break;
case NID_sha256:
*digest = digest_sha256();
break;
case NID_sha384:
*digest = digest_sha384();
break;
case NID_sha512:
*digest = digest_sha512();
break;
default:
ok = 0;
*digest = NULL;
break;
}
return ok;
}
static int ossltest_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
const int **nids, int nid)
{
int ok = 1;
if (!cipher) {
/* We are returning a list of supported nids */
*nids = ossltest_cipher_nids;
return (sizeof(ossltest_cipher_nids) - 1)
/ sizeof(ossltest_cipher_nids[0]);
}
/* We are being asked for a specific cipher */
switch (nid) {
case NID_aes_128_cbc:
*cipher = ossltest_aes_128_cbc();
break;
case NID_aes_128_gcm:
*cipher = ossltest_aes_128_gcm();
break;
default:
ok = 0;
*cipher = NULL;
break;
}
return ok;
}
static void fill_known_data(unsigned char *md, unsigned int len)
{
unsigned int i;
for (i=0; i<len; i++) {
md[i] = (unsigned char)(i & 0xff);
}
}
/*
* MD5 implementation. We go through the motions of doing MD5 by deferring to
* the standard implementation. Then we overwrite the result with a will defined
* value, so that all "MD5" digests using the test engine always end up with
* the same value.
*/
#undef data
#define data(ctx) ((MD5_CTX *)EVP_MD_CTX_md_data(ctx))
static int digest_md5_init(EVP_MD_CTX *ctx)
{
return MD5_Init(data(ctx));
}
static int digest_md5_update(EVP_MD_CTX *ctx, const void *data,
size_t count)
{
return MD5_Update(data(ctx), data, (size_t)count);
}
static int digest_md5_final(EVP_MD_CTX *ctx, unsigned char *md)
{
int ret;
ret = MD5_Final(md, data(ctx));
if (ret > 0) {
fill_known_data(md, MD5_DIGEST_LENGTH);
}
return ret;
}
/*
* SHA1 implementation.
*/
#undef data
#define data(ctx) ((SHA_CTX *)EVP_MD_CTX_md_data(ctx))
static int digest_sha1_init(EVP_MD_CTX *ctx)
{
return SHA1_Init(data(ctx));
}
static int digest_sha1_update(EVP_MD_CTX *ctx, const void *data,
size_t count)
{
return SHA1_Update(data(ctx), data, (size_t)count);
}
static int digest_sha1_final(EVP_MD_CTX *ctx, unsigned char *md)
{
int ret;
ret = SHA1_Final(md, data(ctx));
if (ret > 0) {
fill_known_data(md, SHA_DIGEST_LENGTH);
}
return ret;
}
/*
* SHA256 implementation.
*/
#undef data
#define data(ctx) ((SHA256_CTX *)EVP_MD_CTX_md_data(ctx))
static int digest_sha256_init(EVP_MD_CTX *ctx)
{
return SHA256_Init(data(ctx));
}
static int digest_sha256_update(EVP_MD_CTX *ctx, const void *data,
size_t count)
{
return SHA256_Update(data(ctx), data, (size_t)count);
}
static int digest_sha256_final(EVP_MD_CTX *ctx, unsigned char *md)
{
int ret;
ret = SHA256_Final(md, data(ctx));
if (ret > 0) {
fill_known_data(md, SHA256_DIGEST_LENGTH);
}
return ret;
}
/*
* SHA384/512 implementation.
*/
#undef data
#define data(ctx) ((SHA512_CTX *)EVP_MD_CTX_md_data(ctx))
static int digest_sha384_init(EVP_MD_CTX *ctx)
{
return SHA384_Init(data(ctx));
}
static int digest_sha512_init(EVP_MD_CTX *ctx)
{
return SHA512_Init(data(ctx));
}
static int digest_sha512_update(EVP_MD_CTX *ctx, const void *data,
size_t count)
{
return SHA512_Update(data(ctx), data, (size_t)count);
}
static int digest_sha384_final(EVP_MD_CTX *ctx, unsigned char *md)
{
int ret;
/* Actually uses SHA512_Final! */
ret = SHA512_Final(md, data(ctx));
if (ret > 0) {
fill_known_data(md, SHA384_DIGEST_LENGTH);
}
return ret;
}
static int digest_sha512_final(EVP_MD_CTX *ctx, unsigned char *md)
{
int ret;
ret = SHA512_Final(md, data(ctx));
if (ret > 0) {
fill_known_data(md, SHA512_DIGEST_LENGTH);
}
return ret;
}
/*
* AES128 Implementation
*/
int ossltest_aes128_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc)
{
return EVP_CIPHER_meth_get_init(EVP_aes_128_cbc()) (ctx, key, iv, enc);
}
int ossltest_aes128_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl)
{
unsigned char *tmpbuf;
int ret;
tmpbuf = OPENSSL_malloc(inl);
if (tmpbuf == NULL)
return -1;
/* Remember what we were asked to encrypt */
memcpy(tmpbuf, in, inl);
/* Go through the motions of encrypting it */
ret = EVP_CIPHER_meth_get_do_cipher(EVP_aes_128_cbc())(ctx, out, in, inl);
/* Throw it all away and just use the plaintext as the output */
memcpy(out, tmpbuf, inl);
OPENSSL_free(tmpbuf);
return ret;
}
int ossltest_aes128_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc)
{
return EVP_CIPHER_meth_get_init(EVP_aes_128_gcm()) (ctx, key, iv, enc);
}
int ossltest_aes128_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl)
{
unsigned char *tmpbuf = OPENSSL_malloc(inl);
/* OPENSSL_malloc will return NULL if inl == 0 */
if (tmpbuf == NULL && inl > 0)
return -1;
/* Remember what we were asked to encrypt */
memcpy(tmpbuf, in, inl);
/* Go through the motions of encrypting it */
EVP_CIPHER_meth_get_do_cipher(EVP_aes_128_gcm())(ctx, out, in, inl);
/* Throw it all away and just use the plaintext as the output */
memcpy(out, tmpbuf, inl);
OPENSSL_free(tmpbuf);
return inl;
}
static int ossltest_aes128_gcm_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
void *ptr)
{
/* Pass the ctrl down */
int ret = EVP_CIPHER_meth_get_ctrl(EVP_aes_128_gcm())(ctx, type, arg, ptr);
if (ret <= 0)
return ret;
switch(type) {
case EVP_CTRL_AEAD_GET_TAG:
/* Always give the same tag */
memset(ptr, 0, EVP_GCM_TLS_TAG_LEN);
break;
default:
break;
}
return 1;
}
static int ossltest_rand_bytes(unsigned char *buf, int num)
{
unsigned char val = 1;
while (--num >= 0)
*buf++ = val++;
return 1;
}
static int ossltest_rand_status(void)
{
return 1;
}
static const RAND_METHOD *ossltest_rand_method(void)
{
static RAND_METHOD osslt_rand_meth = {
NULL,
ossltest_rand_bytes,
NULL,
NULL,
ossltest_rand_bytes,
ossltest_rand_status
};
return &osslt_rand_meth;
}
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