mirror of
https://github.com/openssl/openssl.git
synced 2024-12-03 05:41:46 +08:00
da1c088f59
Reviewed-by: Richard Levitte <levitte@openssl.org> Release: yes
466 lines
12 KiB
C
466 lines
12 KiB
C
/*
|
|
* Copyright 2022-2023 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 "ssl_local.h"
|
|
#include "internal/e_os.h"
|
|
#include "internal/refcount.h"
|
|
|
|
size_t ossl_calculate_comp_expansion(int alg, size_t length)
|
|
{
|
|
size_t ret;
|
|
/*
|
|
* Uncompressibility expansion:
|
|
* ZLIB: N + 11 + 5 * (N >> 14)
|
|
* Brotli: per RFC7932: N + 5 + 3 * (N >> 16)
|
|
* ZSTD: N + 4 + 14 + 3 * (N >> 17) + 4
|
|
*/
|
|
|
|
switch (alg) {
|
|
case TLSEXT_comp_cert_zlib:
|
|
ret = length + 11 + 5 * (length >> 14);
|
|
break;
|
|
case TLSEXT_comp_cert_brotli:
|
|
ret = length + 5 + 3 * (length >> 16);
|
|
break;
|
|
case TLSEXT_comp_cert_zstd:
|
|
ret = length + 22 + 3 * (length >> 17);
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
/* Check for overflow */
|
|
if (ret < length)
|
|
return 0;
|
|
return ret;
|
|
}
|
|
|
|
int ossl_comp_has_alg(int a)
|
|
{
|
|
#ifndef OPENSSL_NO_COMP_ALG
|
|
/* 0 means "any" algorithm */
|
|
if ((a == 0 || a == TLSEXT_comp_cert_brotli) && BIO_f_brotli() != NULL)
|
|
return 1;
|
|
if ((a == 0 || a == TLSEXT_comp_cert_zstd) && BIO_f_zstd() != NULL)
|
|
return 1;
|
|
if ((a == 0 || a == TLSEXT_comp_cert_zlib) && BIO_f_zlib() != NULL)
|
|
return 1;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/* New operation Helper routine */
|
|
#ifndef OPENSSL_NO_COMP_ALG
|
|
static OSSL_COMP_CERT *OSSL_COMP_CERT_new(unsigned char *data, size_t len, size_t orig_len, int alg)
|
|
{
|
|
OSSL_COMP_CERT *ret = NULL;
|
|
|
|
if (!ossl_comp_has_alg(alg)
|
|
|| data == NULL
|
|
|| (ret = OPENSSL_zalloc(sizeof(*ret))) == NULL
|
|
|| !CRYPTO_NEW_REF(&ret->references, 1))
|
|
goto err;
|
|
|
|
ret->data = data;
|
|
ret->len = len;
|
|
ret->orig_len = orig_len;
|
|
ret->alg = alg;
|
|
return ret;
|
|
err:
|
|
ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
|
|
OPENSSL_free(data);
|
|
OPENSSL_free(ret);
|
|
return NULL;
|
|
}
|
|
|
|
__owur static OSSL_COMP_CERT *OSSL_COMP_CERT_from_compressed_data(unsigned char *data, size_t len,
|
|
size_t orig_len, int alg)
|
|
{
|
|
return OSSL_COMP_CERT_new(OPENSSL_memdup(data, len), len, orig_len, alg);
|
|
}
|
|
|
|
__owur static OSSL_COMP_CERT *OSSL_COMP_CERT_from_uncompressed_data(unsigned char *data, size_t len,
|
|
int alg)
|
|
{
|
|
OSSL_COMP_CERT *ret = NULL;
|
|
size_t max_length;
|
|
int comp_length;
|
|
COMP_METHOD *method;
|
|
unsigned char *comp_data = NULL;
|
|
COMP_CTX *comp_ctx = NULL;
|
|
|
|
switch (alg) {
|
|
case TLSEXT_comp_cert_brotli:
|
|
method = COMP_brotli_oneshot();
|
|
break;
|
|
case TLSEXT_comp_cert_zlib:
|
|
method = COMP_zlib_oneshot();
|
|
break;
|
|
case TLSEXT_comp_cert_zstd:
|
|
method = COMP_zstd_oneshot();
|
|
break;
|
|
default:
|
|
goto err;
|
|
}
|
|
|
|
if ((max_length = ossl_calculate_comp_expansion(alg, len)) == 0
|
|
|| method == NULL
|
|
|| (comp_ctx = COMP_CTX_new(method)) == NULL
|
|
|| (comp_data = OPENSSL_zalloc(max_length)) == NULL)
|
|
goto err;
|
|
|
|
comp_length = COMP_compress_block(comp_ctx, comp_data, max_length, data, len);
|
|
if (comp_length <= 0)
|
|
goto err;
|
|
|
|
ret = OSSL_COMP_CERT_new(comp_data, comp_length, len, alg);
|
|
comp_data = NULL;
|
|
|
|
err:
|
|
OPENSSL_free(comp_data);
|
|
COMP_CTX_free(comp_ctx);
|
|
return ret;
|
|
}
|
|
|
|
void OSSL_COMP_CERT_free(OSSL_COMP_CERT *cc)
|
|
{
|
|
int i;
|
|
|
|
if (cc == NULL)
|
|
return;
|
|
|
|
CRYPTO_DOWN_REF(&cc->references, &i);
|
|
REF_PRINT_COUNT("OSSL_COMP_CERT", cc);
|
|
if (i > 0)
|
|
return;
|
|
REF_ASSERT_ISNT(i < 0);
|
|
|
|
OPENSSL_free(cc->data);
|
|
CRYPTO_FREE_REF(&cc->references);
|
|
OPENSSL_free(cc);
|
|
}
|
|
int OSSL_COMP_CERT_up_ref(OSSL_COMP_CERT *cc)
|
|
{
|
|
int i;
|
|
|
|
if (CRYPTO_UP_REF(&cc->references, &i) <= 0)
|
|
return 0;
|
|
|
|
REF_PRINT_COUNT("OSSL_COMP_CERT", cc);
|
|
REF_ASSERT_ISNT(i < 2);
|
|
return ((i > 1) ? 1 : 0);
|
|
}
|
|
|
|
static int ssl_set_cert_comp_pref(int *prefs, int *algs, size_t len)
|
|
{
|
|
size_t j = 0;
|
|
size_t i;
|
|
int found = 0;
|
|
int already_set[TLSEXT_comp_cert_limit];
|
|
int tmp_prefs[TLSEXT_comp_cert_limit];
|
|
|
|
/* Note that |len| is the number of |algs| elements */
|
|
/* clear all algorithms */
|
|
if (len == 0 || algs == NULL) {
|
|
memset(prefs, 0, sizeof(tmp_prefs));
|
|
return 1;
|
|
}
|
|
|
|
/* This will 0-terminate the array */
|
|
memset(tmp_prefs, 0, sizeof(tmp_prefs));
|
|
memset(already_set, 0, sizeof(already_set));
|
|
/* Include only those algorithms we support, ignoring duplicates and unknowns */
|
|
for (i = 0; i < len; i++) {
|
|
if (algs[i] != 0 && ossl_comp_has_alg(algs[i])) {
|
|
/* Check for duplicate */
|
|
if (already_set[algs[i]])
|
|
return 0;
|
|
tmp_prefs[j++] = algs[i];
|
|
already_set[algs[i]] = 1;
|
|
found = 1;
|
|
}
|
|
}
|
|
if (found)
|
|
memcpy(prefs, tmp_prefs, sizeof(tmp_prefs));
|
|
return found;
|
|
}
|
|
|
|
static size_t ssl_get_cert_to_compress(SSL *ssl, CERT_PKEY *cpk, unsigned char **data)
|
|
{
|
|
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(ssl);
|
|
WPACKET tmppkt;
|
|
BUF_MEM buf = { 0 };
|
|
size_t ret = 0;
|
|
|
|
if (sc == NULL
|
|
|| cpk == NULL
|
|
|| !sc->server
|
|
|| !SSL_in_before(ssl))
|
|
return 0;
|
|
|
|
/* Use the |tmppkt| for the to-be-compressed data */
|
|
if (!WPACKET_init(&tmppkt, &buf))
|
|
goto out;
|
|
|
|
/* no context present, add 0-length context */
|
|
if (!WPACKET_put_bytes_u8(&tmppkt, 0))
|
|
goto out;
|
|
|
|
/*
|
|
* ssl3_output_cert_chain() may generate an SSLfatal() error,
|
|
* for this case, we want to ignore it, argument for_comp = 1
|
|
*/
|
|
if (!ssl3_output_cert_chain(sc, &tmppkt, cpk, 1))
|
|
goto out;
|
|
WPACKET_get_total_written(&tmppkt, &ret);
|
|
|
|
out:
|
|
WPACKET_cleanup(&tmppkt);
|
|
if (ret != 0 && data != NULL)
|
|
*data = (unsigned char *)buf.data;
|
|
else
|
|
OPENSSL_free(buf.data);
|
|
return ret;
|
|
}
|
|
|
|
static int ssl_compress_one_cert(SSL *ssl, CERT_PKEY *cpk, int alg)
|
|
{
|
|
unsigned char *cert_data = NULL;
|
|
OSSL_COMP_CERT *comp_cert = NULL;
|
|
size_t length;
|
|
|
|
if (cpk == NULL
|
|
|| alg == TLSEXT_comp_cert_none
|
|
|| !ossl_comp_has_alg(alg))
|
|
return 0;
|
|
|
|
if ((length = ssl_get_cert_to_compress(ssl, cpk, &cert_data)) == 0)
|
|
return 0;
|
|
comp_cert = OSSL_COMP_CERT_from_uncompressed_data(cert_data, length, alg);
|
|
OPENSSL_free(cert_data);
|
|
if (comp_cert == NULL)
|
|
return 0;
|
|
|
|
OSSL_COMP_CERT_free(cpk->comp_cert[alg]);
|
|
cpk->comp_cert[alg] = comp_cert;
|
|
return 1;
|
|
}
|
|
|
|
/* alg_in can be 0, meaning any/all algorithms */
|
|
static int ssl_compress_certs(SSL *ssl, CERT_PKEY *cpks, int alg_in)
|
|
{
|
|
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(ssl);
|
|
int i;
|
|
int j;
|
|
int alg;
|
|
int count = 0;
|
|
|
|
if (sc == NULL
|
|
|| cpks == NULL
|
|
|| !ossl_comp_has_alg(alg_in))
|
|
return 0;
|
|
|
|
/* Look through the preferences to see what we have */
|
|
for (i = 0; i < TLSEXT_comp_cert_limit; i++) {
|
|
/*
|
|
* alg = 0 means compress for everything, but only for algorithms enabled
|
|
* alg != 0 means compress for that algorithm if enabled
|
|
*/
|
|
alg = sc->cert_comp_prefs[i];
|
|
if ((alg_in == 0 && alg != TLSEXT_comp_cert_none)
|
|
|| (alg_in != 0 && alg == alg_in)) {
|
|
|
|
for (j = 0; j < SSL_PKEY_NUM; j++) {
|
|
/* No cert, move on */
|
|
if (cpks[j].x509 == NULL)
|
|
continue;
|
|
|
|
if (!ssl_compress_one_cert(ssl, &cpks[j], alg))
|
|
return 0;
|
|
|
|
/* if the cert expanded, set the value in the CERT_PKEY to NULL */
|
|
if (cpks[j].comp_cert[alg]->len >= cpks[j].comp_cert[alg]->orig_len) {
|
|
OSSL_COMP_CERT_free(cpks[j].comp_cert[alg]);
|
|
cpks[j].comp_cert[alg] = NULL;
|
|
} else {
|
|
count++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return (count > 0);
|
|
}
|
|
|
|
static size_t ssl_get_compressed_cert(SSL *ssl, CERT_PKEY *cpk, int alg, unsigned char **data,
|
|
size_t *orig_len)
|
|
{
|
|
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(ssl);
|
|
size_t cert_len = 0;
|
|
size_t comp_len = 0;
|
|
unsigned char *cert_data = NULL;
|
|
OSSL_COMP_CERT *comp_cert = NULL;
|
|
|
|
if (sc == NULL
|
|
|| cpk == NULL
|
|
|| data == NULL
|
|
|| orig_len == NULL
|
|
|| !sc->server
|
|
|| !SSL_in_before(ssl)
|
|
|| !ossl_comp_has_alg(alg))
|
|
return 0;
|
|
|
|
if ((cert_len = ssl_get_cert_to_compress(ssl, cpk, &cert_data)) == 0)
|
|
goto err;
|
|
|
|
comp_cert = OSSL_COMP_CERT_from_uncompressed_data(cert_data, cert_len, alg);
|
|
OPENSSL_free(cert_data);
|
|
if (comp_cert == NULL)
|
|
goto err;
|
|
|
|
comp_len = comp_cert->len;
|
|
*orig_len = comp_cert->orig_len;
|
|
*data = comp_cert->data;
|
|
comp_cert->data = NULL;
|
|
err:
|
|
OSSL_COMP_CERT_free(comp_cert);
|
|
return comp_len;
|
|
}
|
|
|
|
static int ossl_set1_compressed_cert(CERT *cert, int algorithm,
|
|
unsigned char *comp_data, size_t comp_length,
|
|
size_t orig_length)
|
|
{
|
|
OSSL_COMP_CERT *comp_cert;
|
|
|
|
/* No explicit cert set */
|
|
if (cert == NULL || cert->key == NULL)
|
|
return 0;
|
|
|
|
comp_cert = OSSL_COMP_CERT_from_compressed_data(comp_data, comp_length,
|
|
orig_length, algorithm);
|
|
if (comp_cert == NULL)
|
|
return 0;
|
|
|
|
OSSL_COMP_CERT_free(cert->key->comp_cert[algorithm]);
|
|
cert->key->comp_cert[algorithm] = comp_cert;
|
|
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
/*-
|
|
* Public API
|
|
*/
|
|
int SSL_CTX_set1_cert_comp_preference(SSL_CTX *ctx, int *algs, size_t len)
|
|
{
|
|
#ifndef OPENSSL_NO_COMP_ALG
|
|
return ssl_set_cert_comp_pref(ctx->cert_comp_prefs, algs, len);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
int SSL_set1_cert_comp_preference(SSL *ssl, int *algs, size_t len)
|
|
{
|
|
#ifndef OPENSSL_NO_COMP_ALG
|
|
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(ssl);
|
|
|
|
if (sc == NULL)
|
|
return 0;
|
|
return ssl_set_cert_comp_pref(sc->cert_comp_prefs, algs, len);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
int SSL_compress_certs(SSL *ssl, int alg)
|
|
{
|
|
#ifndef OPENSSL_NO_COMP_ALG
|
|
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(ssl);
|
|
|
|
if (sc == NULL || sc->cert == NULL)
|
|
return 0;
|
|
|
|
return ssl_compress_certs(ssl, sc->cert->pkeys, alg);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
int SSL_CTX_compress_certs(SSL_CTX *ctx, int alg)
|
|
{
|
|
int ret = 0;
|
|
#ifndef OPENSSL_NO_COMP_ALG
|
|
SSL *new = SSL_new(ctx);
|
|
|
|
if (new == NULL)
|
|
return 0;
|
|
|
|
ret = ssl_compress_certs(new, ctx->cert->pkeys, alg);
|
|
SSL_free(new);
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
size_t SSL_get1_compressed_cert(SSL *ssl, int alg, unsigned char **data, size_t *orig_len)
|
|
{
|
|
#ifndef OPENSSL_NO_COMP_ALG
|
|
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(ssl);
|
|
CERT_PKEY *cpk = NULL;
|
|
|
|
if (sc->cert != NULL)
|
|
cpk = sc->cert->key;
|
|
else
|
|
cpk = ssl->ctx->cert->key;
|
|
|
|
return ssl_get_compressed_cert(ssl, cpk, alg, data, orig_len);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
size_t SSL_CTX_get1_compressed_cert(SSL_CTX *ctx, int alg, unsigned char **data, size_t *orig_len)
|
|
{
|
|
#ifndef OPENSSL_NO_COMP_ALG
|
|
size_t ret;
|
|
SSL *new = SSL_new(ctx);
|
|
|
|
ret = ssl_get_compressed_cert(new, ctx->cert->key, alg, data, orig_len);
|
|
SSL_free(new);
|
|
return ret;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
int SSL_CTX_set1_compressed_cert(SSL_CTX *ctx, int algorithm, unsigned char *comp_data,
|
|
size_t comp_length, size_t orig_length)
|
|
{
|
|
#ifndef OPENSSL_NO_COMP_ALG
|
|
return ossl_set1_compressed_cert(ctx->cert, algorithm, comp_data, comp_length, orig_length);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
int SSL_set1_compressed_cert(SSL *ssl, int algorithm, unsigned char *comp_data,
|
|
size_t comp_length, size_t orig_length)
|
|
{
|
|
#ifndef OPENSSL_NO_COMP_ALG
|
|
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(ssl);
|
|
|
|
/* Cannot set a pre-compressed certificate on a client */
|
|
if (sc == NULL || !sc->server)
|
|
return 0;
|
|
|
|
return ossl_set1_compressed_cert(sc->cert, algorithm, comp_data, comp_length, orig_length);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|