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openssl/providers/implementations/ciphers/cipher_aes_cbc_hmac_sha.c
Matt Caswell 6db0d58d81 Fix RC4-MD5 based ciphersuites 
The RC4-MD5 ciphersuites were not removing the length of the MAC when
calculating the length of decrypted TLS data. Since RC4 is a streamed
cipher that doesn't use padding we separate out the concepts of fixed
length TLS data to be removed, and TLS padding.

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/13378)
2020-11-25 10:14:43 +00:00

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/*
* Copyright 2019-2020 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
*/
/*
* AES low level APIs are deprecated for public use, but still ok for internal
* use where we're using them to implement the higher level EVP interface, as is
* the case here.
*/
#include "internal/deprecated.h"
/* Dispatch functions for AES_CBC_HMAC_SHA ciphers */
/* Only for SSL3_VERSION and TLS1_VERSION */
#include <openssl/ssl.h>
#include "cipher_aes_cbc_hmac_sha.h"
#include "prov/implementations.h"
#include "prov/providercommon.h"
#ifndef AES_CBC_HMAC_SHA_CAPABLE
# define IMPLEMENT_CIPHER(nm, sub, kbits, blkbits, ivbits, flags) \
const OSSL_DISPATCH ossl_##nm##kbits##sub##_functions[] = { \
{ 0, NULL } \
};
#else
# include "prov/providercommonerr.h"
/* TODO(3.0) Figure out what flags are required */
# define AES_CBC_HMAC_SHA_FLAGS (EVP_CIPH_CBC_MODE \
| EVP_CIPH_FLAG_DEFAULT_ASN1 \
| EVP_CIPH_FLAG_AEAD_CIPHER \
| EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK)
static OSSL_FUNC_cipher_freectx_fn aes_cbc_hmac_sha1_freectx;
static OSSL_FUNC_cipher_freectx_fn aes_cbc_hmac_sha256_freectx;
static OSSL_FUNC_cipher_get_ctx_params_fn aes_get_ctx_params;
static OSSL_FUNC_cipher_gettable_ctx_params_fn aes_gettable_ctx_params;
static OSSL_FUNC_cipher_set_ctx_params_fn aes_set_ctx_params;
static OSSL_FUNC_cipher_settable_ctx_params_fn aes_settable_ctx_params;
# define aes_gettable_params ossl_cipher_generic_gettable_params
# define aes_einit ossl_cipher_generic_einit
# define aes_dinit ossl_cipher_generic_dinit
# define aes_update ossl_cipher_generic_stream_update
# define aes_final ossl_cipher_generic_stream_final
# define aes_cipher ossl_cipher_generic_cipher
static const OSSL_PARAM cipher_aes_known_settable_ctx_params[] = {
OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_AEAD_MAC_KEY, NULL, 0),
OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD, NULL, 0),
# if !defined(OPENSSL_NO_MULTIBLOCK)
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_MAX_SEND_FRAGMENT, NULL),
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_AAD, NULL),
OSSL_PARAM_uint(OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE, NULL),
OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC, NULL, 0),
OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC_IN, NULL, 0),
# endif /* !defined(OPENSSL_NO_MULTIBLOCK) */
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
OSSL_PARAM_END
};
const OSSL_PARAM *aes_settable_ctx_params(ossl_unused void *provctx)
{
return cipher_aes_known_settable_ctx_params;
}
static int aes_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
PROV_AES_HMAC_SHA_CTX *ctx = (PROV_AES_HMAC_SHA_CTX *)vctx;
PROV_CIPHER_HW_AES_HMAC_SHA *hw =
(PROV_CIPHER_HW_AES_HMAC_SHA *)ctx->hw;
const OSSL_PARAM *p;
int ret = 1;
# if !defined(OPENSSL_NO_MULTIBLOCK)
EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM mb_param;
# endif
p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_MAC_KEY);
if (p != NULL) {
if (p->data_type != OSSL_PARAM_OCTET_STRING) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
return 0;
}
hw->init_mac_key(ctx, p->data, p->data_size);
}
# if !defined(OPENSSL_NO_MULTIBLOCK)
p = OSSL_PARAM_locate_const(params,
OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_MAX_SEND_FRAGMENT);
if (p != NULL
&& !OSSL_PARAM_get_size_t(p, &ctx->multiblock_max_send_fragment)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
return 0;
}
/*
* The inputs to tls1_multiblock_aad are:
* mb_param->inp
* mb_param->len
* mb_param->interleave
* The outputs of tls1_multiblock_aad are written to:
* ctx->multiblock_interleave
* ctx->multiblock_aad_packlen
*/
p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_AAD);
if (p != NULL) {
const OSSL_PARAM *p1 = OSSL_PARAM_locate_const(params,
OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE);
if (p->data_type != OSSL_PARAM_OCTET_STRING
|| p1 == NULL
|| !OSSL_PARAM_get_uint(p1, &mb_param.interleave)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
return 0;
}
mb_param.inp = p->data;
mb_param.len = p->data_size;
if (hw->tls1_multiblock_aad(vctx, &mb_param) <= 0)
return 0;
}
/*
* The inputs to tls1_multiblock_encrypt are:
* mb_param->inp
* mb_param->len
* mb_param->interleave
* mb_param->out
* The outputs of tls1_multiblock_encrypt are:
* ctx->multiblock_encrypt_len
*/
p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC);
if (p != NULL) {
const OSSL_PARAM *p1 = OSSL_PARAM_locate_const(params,
OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE);
const OSSL_PARAM *pin = OSSL_PARAM_locate_const(params,
OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC_IN);
if (p->data_type != OSSL_PARAM_OCTET_STRING
|| pin == NULL
|| pin->data_type != OSSL_PARAM_OCTET_STRING
|| p1 == NULL
|| !OSSL_PARAM_get_uint(p1, &mb_param.interleave)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
return 0;
}
mb_param.out = p->data;
mb_param.inp = pin->data;
mb_param.len = pin->data_size;
if (hw->tls1_multiblock_encrypt(vctx, &mb_param) <= 0)
return 0;
}
# endif /* !defined(OPENSSL_NO_MULTIBLOCK) */
p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TLS1_AAD);
if (p != NULL) {
if (p->data_type != OSSL_PARAM_OCTET_STRING) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
return 0;
}
if (hw->set_tls1_aad(ctx, p->data, p->data_size) <= 0)
return 0;
}
p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
if (p != NULL) {
size_t keylen;
if (!OSSL_PARAM_get_size_t(p, &keylen)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
return 0;
}
if (ctx->base.keylen != keylen) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
return 0;
}
}
p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_TLS_VERSION);
if (p != NULL) {
if (!OSSL_PARAM_get_uint(p, &ctx->base.tlsversion)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
return 0;
}
if (ctx->base.tlsversion == SSL3_VERSION
|| ctx->base.tlsversion == TLS1_VERSION) {
if (!ossl_assert(ctx->base.removetlsfixed >= AES_BLOCK_SIZE)) {
ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
return 0;
}
/*
* There is no explicit IV with these TLS versions, so don't attempt
* to remove it.
*/
ctx->base.removetlsfixed -= AES_BLOCK_SIZE;
}
}
return ret;
}
static int aes_get_ctx_params(void *vctx, OSSL_PARAM params[])
{
PROV_AES_HMAC_SHA_CTX *ctx = (PROV_AES_HMAC_SHA_CTX *)vctx;
OSSL_PARAM *p;
# if !defined(OPENSSL_NO_MULTIBLOCK)
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_MAX_BUFSIZE);
if (p != NULL) {
PROV_CIPHER_HW_AES_HMAC_SHA *hw =
(PROV_CIPHER_HW_AES_HMAC_SHA *)ctx->hw;
size_t len = hw->tls1_multiblock_max_bufsize(ctx);
if (!OSSL_PARAM_set_size_t(p, len)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
return 0;
}
}
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE);
if (p != NULL && !OSSL_PARAM_set_uint(p, ctx->multiblock_interleave)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
return 0;
}
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_AAD_PACKLEN);
if (p != NULL && !OSSL_PARAM_set_uint(p, ctx->multiblock_aad_packlen)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
return 0;
}
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC_LEN);
if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->multiblock_encrypt_len)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
return 0;
}
# endif /* !defined(OPENSSL_NO_MULTIBLOCK) */
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD);
if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->tls_aad_pad)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
return 0;
}
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_KEYLEN);
if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->base.keylen)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
return 0;
}
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IVLEN);
if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->base.ivlen)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
return 0;
}
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IV);
if (p != NULL
&& !OSSL_PARAM_set_octet_string(p, ctx->base.oiv, ctx->base.ivlen)
&& !OSSL_PARAM_set_octet_ptr(p, &ctx->base.oiv, ctx->base.ivlen)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
return 0;
}
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IV_STATE);
if (p != NULL
&& !OSSL_PARAM_set_octet_string(p, ctx->base.iv, ctx->base.ivlen)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
return 0;
}
return 1;
}
static const OSSL_PARAM cipher_aes_known_gettable_ctx_params[] = {
# if !defined(OPENSSL_NO_MULTIBLOCK)
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_MAX_BUFSIZE, NULL),
OSSL_PARAM_uint(OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE, NULL),
OSSL_PARAM_uint(OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_AAD_PACKLEN, NULL),
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC_LEN, NULL),
# endif /* !defined(OPENSSL_NO_MULTIBLOCK) */
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, NULL),
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL),
OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_IV, NULL, 0),
OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_IV_STATE, NULL, 0),
OSSL_PARAM_END
};
const OSSL_PARAM *aes_gettable_ctx_params(ossl_unused void *provctx)
{
return cipher_aes_known_gettable_ctx_params;
}
static void base_init(void *provctx, PROV_AES_HMAC_SHA_CTX *ctx,
const PROV_CIPHER_HW_AES_HMAC_SHA *meths,
size_t kbits, size_t blkbits, size_t ivbits,
uint64_t flags)
{
ossl_cipher_generic_initkey(&ctx->base, kbits, blkbits, ivbits,
EVP_CIPH_CBC_MODE, flags,
&meths->base, provctx);
ctx->hw = (PROV_CIPHER_HW_AES_HMAC_SHA *)ctx->base.hw;
}
static void *aes_cbc_hmac_sha1_newctx(void *provctx, size_t kbits,
size_t blkbits, size_t ivbits,
uint64_t flags)
{
PROV_AES_HMAC_SHA1_CTX *ctx;
if (!ossl_prov_is_running())
return NULL;
ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx != NULL)
base_init(provctx, &ctx->base_ctx,
ossl_prov_cipher_hw_aes_cbc_hmac_sha1(), kbits, blkbits,
ivbits, flags);
return ctx;
}
static void aes_cbc_hmac_sha1_freectx(void *vctx)
{
PROV_AES_HMAC_SHA1_CTX *ctx = (PROV_AES_HMAC_SHA1_CTX *)vctx;
if (ctx != NULL) {
ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
OPENSSL_clear_free(ctx, sizeof(*ctx));
}
}
static void *aes_cbc_hmac_sha256_newctx(void *provctx, size_t kbits,
size_t blkbits, size_t ivbits,
uint64_t flags)
{
PROV_AES_HMAC_SHA256_CTX *ctx;
if (!ossl_prov_is_running())
return NULL;
ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx != NULL)
base_init(provctx, &ctx->base_ctx,
ossl_prov_cipher_hw_aes_cbc_hmac_sha256(), kbits, blkbits,
ivbits, flags);
return ctx;
}
static void aes_cbc_hmac_sha256_freectx(void *vctx)
{
PROV_AES_HMAC_SHA256_CTX *ctx = (PROV_AES_HMAC_SHA256_CTX *)vctx;
if (ctx != NULL) {
ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
OPENSSL_clear_free(ctx, sizeof(*ctx));
}
}
# define IMPLEMENT_CIPHER(nm, sub, kbits, blkbits, ivbits, flags) \
static OSSL_FUNC_cipher_newctx_fn nm##_##kbits##_##sub##_newctx; \
static void *nm##_##kbits##_##sub##_newctx(void *provctx) \
{ \
return nm##_##sub##_newctx(provctx, kbits, blkbits, ivbits, flags); \
} \
static OSSL_FUNC_cipher_get_params_fn nm##_##kbits##_##sub##_get_params; \
static int nm##_##kbits##_##sub##_get_params(OSSL_PARAM params[]) \
{ \
return ossl_cipher_generic_get_params(params, EVP_CIPH_CBC_MODE, \
flags, kbits, blkbits, ivbits); \
} \
const OSSL_DISPATCH ossl_##nm##kbits##sub##_functions[] = { \
{ OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void))nm##_##kbits##_##sub##_newctx },\
{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))nm##_##sub##_freectx }, \
{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))nm##_einit }, \
{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))nm##_dinit }, \
{ OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))nm##_update }, \
{ OSSL_FUNC_CIPHER_FINAL, (void (*)(void))nm##_final }, \
{ OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))nm##_cipher }, \
{ OSSL_FUNC_CIPHER_GET_PARAMS, \
(void (*)(void))nm##_##kbits##_##sub##_get_params }, \
{ OSSL_FUNC_CIPHER_GETTABLE_PARAMS, \
(void (*)(void))nm##_gettable_params }, \
{ OSSL_FUNC_CIPHER_GET_CTX_PARAMS, \
(void (*)(void))nm##_get_ctx_params }, \
{ OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, \
(void (*)(void))nm##_gettable_ctx_params }, \
{ OSSL_FUNC_CIPHER_SET_CTX_PARAMS, \
(void (*)(void))nm##_set_ctx_params }, \
{ OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, \
(void (*)(void))nm##_settable_ctx_params }, \
{ 0, NULL } \
};
#endif /* AES_CBC_HMAC_SHA_CAPABLE */
/* ossl_aes128cbc_hmac_sha1_functions */
IMPLEMENT_CIPHER(aes, cbc_hmac_sha1, 128, 128, 128, AES_CBC_HMAC_SHA_FLAGS)
/* ossl_aes256cbc_hmac_sha1_functions */
IMPLEMENT_CIPHER(aes, cbc_hmac_sha1, 256, 128, 128, AES_CBC_HMAC_SHA_FLAGS)
/* ossl_aes128cbc_hmac_sha256_functions */
IMPLEMENT_CIPHER(aes, cbc_hmac_sha256, 128, 128, 128, AES_CBC_HMAC_SHA_FLAGS)
/* ossl_aes256cbc_hmac_sha256_functions */
IMPLEMENT_CIPHER(aes, cbc_hmac_sha256, 256, 128, 128, AES_CBC_HMAC_SHA_FLAGS)
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