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/* ssl.c
*
* Copyright (C) 2006-2025 wolfSSL Inc.
*
* This file is part of wolfSSL.
*
* wolfSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* wolfSSL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
#include <wolfssl/wolfcrypt/libwolfssl_sources.h>
#if defined(OPENSSL_EXTRA) && !defined(_WIN32) && !defined(_GNU_SOURCE)
/* turn on GNU extensions for XISASCII */
#define _GNU_SOURCE 1
#endif
#if !defined(WOLFCRYPT_ONLY) || defined(OPENSSL_EXTRA) || \
defined(OPENSSL_EXTRA_X509_SMALL)
#include <wolfssl/internal.h>
#include <wolfssl/error-ssl.h>
#include <wolfssl/wolfcrypt/coding.h>
#include <wolfssl/wolfcrypt/kdf.h>
#ifdef NO_INLINE
#include <wolfssl/wolfcrypt/misc.h>
#else
#define WOLFSSL_MISC_INCLUDED
#include <wolfcrypt/src/misc.c>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#if !defined(WOLFSSL_ALLOW_NO_SUITES) && !defined(WOLFCRYPT_ONLY)
#if defined(NO_DH) && !defined(HAVE_ECC) && !defined(WOLFSSL_STATIC_RSA) \
&& !defined(WOLFSSL_STATIC_DH) && !defined(WOLFSSL_STATIC_PSK) \
&& !defined(HAVE_CURVE25519) && !defined(HAVE_CURVE448)
#error "No cipher suites defined because DH disabled, ECC disabled, " \
"and no static suites defined. Please see top of README"
#endif
#ifdef WOLFSSL_CERT_GEN
/* need access to Cert struct for creating certificate */
#include <wolfssl/wolfcrypt/asn_public.h>
#endif
#endif
#if !defined(WOLFCRYPT_ONLY) && (defined(OPENSSL_EXTRA) \
|| defined(OPENSSL_EXTRA_X509_SMALL) \
|| defined(HAVE_WEBSERVER) || defined(WOLFSSL_KEY_GEN))
#include <wolfssl/openssl/evp.h>
/* openssl headers end, wolfssl internal headers next */
#endif
#include <wolfssl/wolfcrypt/wc_encrypt.h>
#ifndef NO_RSA
#include <wolfssl/wolfcrypt/rsa.h>
#endif
#ifdef OPENSSL_EXTRA
/* openssl headers begin */
#include <wolfssl/openssl/ssl.h>
#include <wolfssl/openssl/aes.h>
#ifndef WOLFCRYPT_ONLY
#include <wolfssl/openssl/hmac.h>
#include <wolfssl/openssl/cmac.h>
#endif
#include <wolfssl/openssl/crypto.h>
#include <wolfssl/openssl/des.h>
#include <wolfssl/openssl/bn.h>
#include <wolfssl/openssl/buffer.h>
#include <wolfssl/openssl/dh.h>
#include <wolfssl/openssl/rsa.h>
#include <wolfssl/openssl/fips_rand.h>
#include <wolfssl/openssl/pem.h>
#include <wolfssl/openssl/ec.h>
#include <wolfssl/openssl/ec25519.h>
#include <wolfssl/openssl/ed25519.h>
#include <wolfssl/openssl/ec448.h>
#include <wolfssl/openssl/ed448.h>
#include <wolfssl/openssl/ecdsa.h>
#include <wolfssl/openssl/ecdh.h>
#include <wolfssl/openssl/err.h>
#include <wolfssl/openssl/modes.h>
#include <wolfssl/openssl/opensslv.h>
#include <wolfssl/openssl/rc4.h>
#include <wolfssl/openssl/stack.h>
#include <wolfssl/openssl/x509_vfy.h>
/* openssl headers end, wolfssl internal headers next */
#include <wolfssl/wolfcrypt/hmac.h>
#include <wolfssl/wolfcrypt/random.h>
#include <wolfssl/wolfcrypt/des3.h>
#include <wolfssl/wolfcrypt/ecc.h>
#include <wolfssl/wolfcrypt/md4.h>
#include <wolfssl/wolfcrypt/md5.h>
#include <wolfssl/wolfcrypt/arc4.h>
#include <wolfssl/wolfcrypt/curve25519.h>
#include <wolfssl/wolfcrypt/ed25519.h>
#include <wolfssl/wolfcrypt/curve448.h>
#if defined(HAVE_FALCON)
#include <wolfssl/wolfcrypt/falcon.h>
#endif /* HAVE_FALCON */
#if defined(HAVE_DILITHIUM)
#include <wolfssl/wolfcrypt/dilithium.h>
#endif /* HAVE_DILITHIUM */
#if defined(HAVE_SPHINCS)
#include <wolfssl/wolfcrypt/sphincs.h>
#endif /* HAVE_SPHINCS */
#if defined(OPENSSL_ALL) || defined(HAVE_STUNNEL)
#ifdef HAVE_OCSP
#include <wolfssl/openssl/ocsp.h>
#endif
#include <wolfssl/openssl/lhash.h>
#include <wolfssl/openssl/txt_db.h>
#endif /* WITH_STUNNEL */
#if defined(WOLFSSL_SHA512) || defined(WOLFSSL_SHA384)
#include <wolfssl/wolfcrypt/sha512.h>
#endif
#if defined(WOLFCRYPT_HAVE_SRP) && !defined(NO_SHA256) \
&& !defined(WC_NO_RNG)
#include <wolfssl/wolfcrypt/srp.h>
#endif
#endif
#if defined(OPENSSL_EXTRA) || defined(OPENSSL_EXTRA_X509_SMALL)
#include <wolfssl/openssl/x509v3.h>
int wolfssl_bn_get_value(WOLFSSL_BIGNUM* bn, mp_int* mpi);
int wolfssl_bn_set_value(WOLFSSL_BIGNUM** bn, mp_int* mpi);
#endif
#if defined(WOLFSSL_QT)
#include <wolfssl/wolfcrypt/sha.h>
#endif
#ifdef NO_ASN
#include <wolfssl/wolfcrypt/dh.h>
#endif
#endif /* !WOLFCRYPT_ONLY || OPENSSL_EXTRA */
/*
* OPENSSL_COMPATIBLE_DEFAULTS:
* Enable default behaviour that is compatible with OpenSSL. For example
* SSL_CTX by default doesn't verify the loaded certs. Enabling this
* should make porting to new projects easier.
* WOLFSSL_CHECK_ALERT_ON_ERR:
* Check for alerts during the handshake in the event of an error.
* NO_SESSION_CACHE_REF:
* wolfSSL_get_session on a client will return a reference to the internal
* ClientCache by default for backwards compatibility. This define will
* make wolfSSL_get_session return a reference to ssl->session. The returned
* pointer will be freed with the related WOLFSSL object.
* SESSION_CACHE_DYNAMIC_MEM:
* Dynamically allocate sessions for the session cache from the heap, as
* opposed to the default which allocates from the stack. Allocates
* memory only when a session is added to the cache, frees memory after the
* session is no longer being used. Recommended for memory-constrained
* systems.
* WOLFSSL_SYS_CA_CERTS
* Enables ability to load system CA certs from the OS via
* wolfSSL_CTX_load_system_CA_certs.
*/
#define WOLFSSL_SSL_MISC_INCLUDED
#include "src/ssl_misc.c"
#define WOLFSSL_EVP_INCLUDED
#include "wolfcrypt/src/evp.c"
/* Crypto code uses EVP APIs. */
#define WOLFSSL_SSL_CRYPTO_INCLUDED
#include "src/ssl_crypto.c"
#ifndef WOLFCRYPT_ONLY
#define WOLFSSL_SSL_CERTMAN_INCLUDED
#include "src/ssl_certman.c"
#define WOLFSSL_SSL_SESS_INCLUDED
#include "src/ssl_sess.c"
#endif
#if (defined(OPENSSL_EXTRA) || defined(OPENSSL_EXTRA_X509_SMALL)) && \
!defined(WOLFCRYPT_ONLY)
/* Convert shortname to NID.
*
* For OpenSSL compatibility.
*
* @param [in] sn Short name of OID.
* @return NID corresponding to shortname on success.
* @return WC_NID_undef when not recognized.
*/
int wc_OBJ_sn2nid(const char *sn)
{
const WOLFSSL_ObjectInfo *obj_info = wolfssl_object_info;
size_t i;
WOLFSSL_ENTER("wc_OBJ_sn2nid");
for (i = 0; i < wolfssl_object_info_sz; i++, obj_info++) {
if (XSTRCMP(sn, obj_info->sName) == 0)
return obj_info->nid;
}
WOLFSSL_MSG("short name not found in table");
return WC_NID_undef;
}
#endif /* OPENSSL_EXTRA || OPENSSL_EXTRA_X509_SMALL */
#ifndef WOLFCRYPT_ONLY
#if defined(WOLFSSL_SYS_CRYPTO_POLICY)
/* The system wide crypto-policy. Configured by wolfSSL_crypto_policy_enable.
* */
static struct SystemCryptoPolicy crypto_policy;
#endif /* WOLFSSL_SYS_CRYPTO_POLICY */
#if !defined(NO_RSA) || !defined(NO_DH) || defined(HAVE_ECC) || \
(defined(OPENSSL_EXTRA) && defined(WOLFSSL_KEY_GEN) && !defined(NO_DSA))
#define HAVE_GLOBAL_RNG /* consolidate flags for using globalRNG */
static WC_RNG globalRNG;
static volatile int initGlobalRNG = 0;
static WC_MAYBE_UNUSED wolfSSL_Mutex globalRNGMutex
WOLFSSL_MUTEX_INITIALIZER_CLAUSE(globalRNGMutex);
#ifndef WOLFSSL_MUTEX_INITIALIZER
static int globalRNGMutex_valid = 0;
#endif
#if defined(OPENSSL_EXTRA) && defined(HAVE_HASHDRBG)
static WOLFSSL_DRBG_CTX* gDrbgDefCtx = NULL;
#endif
WC_RNG* wolfssl_get_global_rng(void)
{
WC_RNG* ret = NULL;
if (initGlobalRNG == 0)
WOLFSSL_MSG("Global RNG no Init");
else
ret = &globalRNG;
return ret;
}
/* Make a global RNG and return.
*
* @return Global RNG on success.
* @return NULL on error.
*/
WC_RNG* wolfssl_make_global_rng(void)
{
WC_RNG* ret;
#ifdef HAVE_GLOBAL_RNG
/* Get the global random number generator instead. */
ret = wolfssl_get_global_rng();
#ifdef OPENSSL_EXTRA
if (ret == NULL) {
/* Create a global random if possible. */
(void)wolfSSL_RAND_Init();
ret = wolfssl_get_global_rng();
}
#endif
#else
WOLFSSL_ERROR_MSG("Bad RNG Init");
ret = NULL;
#endif
return ret;
}
/* Too many defines to check explicitly - prototype it and always include
* for RSA, DH, ECC and DSA for BN. */
WC_RNG* wolfssl_make_rng(WC_RNG* rng, int* local);
/* Make a random number generator or get global if possible.
*
* Global may not be available and NULL will be returned.
*
* @param [in, out] rng Local random number generator.
* @param [out] local Local random number generator returned.
* @return NULL on failure.
* @return A random number generator object.
*/
WC_RNG* wolfssl_make_rng(WC_RNG* rng, int* local)
{
WC_RNG* ret = NULL;
#ifdef WOLFSSL_SMALL_STACK
int freeRng = 0;
/* Allocate RNG object . */
if (rng == NULL) {
rng = (WC_RNG*)XMALLOC(sizeof(WC_RNG), NULL, DYNAMIC_TYPE_RNG);
freeRng = 1;
}
#endif
if (rng != NULL) {
if (wc_InitRng(rng) == 0) {
ret = rng;
*local = 1;
}
else {
WOLFSSL_MSG("Bad RNG Init");
#ifdef WOLFSSL_SMALL_STACK
if (freeRng) {
XFREE(rng, NULL, DYNAMIC_TYPE_RNG);
rng = NULL;
}
#endif
}
}
if (ret == NULL) {
#ifdef HAVE_GLOBAL_RNG
WOLFSSL_MSG("trying global RNG");
#endif
ret = wolfssl_make_global_rng();
}
return ret;
}
#endif
#ifdef OPENSSL_EXTRA
/* WOLFSSL_NO_OPENSSL_RAND_CB: Allows way to reduce code size for
* OPENSSL_EXTRA where RAND callbacks are not used */
#ifndef WOLFSSL_NO_OPENSSL_RAND_CB
static const WOLFSSL_RAND_METHOD* gRandMethods = NULL;
static wolfSSL_Mutex gRandMethodMutex
WOLFSSL_MUTEX_INITIALIZER_CLAUSE(gRandMethodMutex);
#ifndef WOLFSSL_MUTEX_INITIALIZER
static int gRandMethodsInit = 0;
#endif
#endif /* !WOLFSSL_NO_OPENSSL_RAND_CB */
#endif /* OPENSSL_EXTRA */
#define WOLFSSL_SSL_BN_INCLUDED
#include "src/ssl_bn.c"
#ifndef OPENSSL_EXTRA_NO_ASN1
#define WOLFSSL_SSL_ASN1_INCLUDED
#include "src/ssl_asn1.c"
#endif /* OPENSSL_EXTRA_NO_ASN1 */
#define WOLFSSL_PK_INCLUDED
#include "src/pk.c"
#include <wolfssl/wolfcrypt/hpke.h>
#if defined(WOLFSSL_TLS13) && defined(HAVE_ECH)
/* create the hpke key and ech config to send to clients */
int wolfSSL_CTX_GenerateEchConfig(WOLFSSL_CTX* ctx, const char* publicName,
word16 kemId, word16 kdfId, word16 aeadId)
{
int ret = 0;
word16 encLen = DHKEM_X25519_ENC_LEN;
WOLFSSL_EchConfig* newConfig;
WOLFSSL_EchConfig* parentConfig;
#ifdef WOLFSSL_SMALL_STACK
Hpke* hpke = NULL;
WC_RNG* rng;
#else
Hpke hpke[1];
WC_RNG rng[1];
#endif
if (ctx == NULL || publicName == NULL)
return BAD_FUNC_ARG;
#ifdef WOLFSSL_SMALL_STACK
rng = (WC_RNG*)XMALLOC(sizeof(WC_RNG), ctx->heap, DYNAMIC_TYPE_RNG);
if (rng == NULL)
return MEMORY_E;
#endif
ret = wc_InitRng(rng);
if (ret != 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(rng, ctx->heap, DYNAMIC_TYPE_RNG);
#endif
return ret;
}
newConfig = (WOLFSSL_EchConfig*)XMALLOC(sizeof(WOLFSSL_EchConfig),
ctx->heap, DYNAMIC_TYPE_TMP_BUFFER);
if (newConfig == NULL)
ret = MEMORY_E;
else
XMEMSET(newConfig, 0, sizeof(WOLFSSL_EchConfig));
/* set random config id */
if (ret == 0)
ret = wc_RNG_GenerateByte(rng, &newConfig->configId);
/* if 0 is selected for algorithms use default, may change with draft */
if (kemId == 0)
kemId = DHKEM_X25519_HKDF_SHA256;
if (kdfId == 0)
kdfId = HKDF_SHA256;
if (aeadId == 0)
aeadId = HPKE_AES_128_GCM;
if (ret == 0) {
/* set the kem id */
newConfig->kemId = kemId;
/* set the cipher suite, only 1 for now */
newConfig->numCipherSuites = 1;
newConfig->cipherSuites =
(EchCipherSuite*)XMALLOC(sizeof(EchCipherSuite), ctx->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (newConfig->cipherSuites == NULL) {
ret = MEMORY_E;
}
else {
newConfig->cipherSuites[0].kdfId = kdfId;
newConfig->cipherSuites[0].aeadId = aeadId;
}
}
#ifdef WOLFSSL_SMALL_STACK
if (ret == 0) {
hpke = (Hpke*)XMALLOC(sizeof(Hpke), ctx->heap, DYNAMIC_TYPE_TMP_BUFFER);
if (hpke == NULL)
ret = MEMORY_E;
}
#endif
if (ret == 0)
ret = wc_HpkeInit(hpke, kemId, kdfId, aeadId, ctx->heap);
/* generate the receiver private key */
if (ret == 0)
ret = wc_HpkeGenerateKeyPair(hpke, &newConfig->receiverPrivkey, rng);
/* done with RNG */
wc_FreeRng(rng);
/* serialize the receiver key */
if (ret == 0)
ret = wc_HpkeSerializePublicKey(hpke, newConfig->receiverPrivkey,
newConfig->receiverPubkey, &encLen);
if (ret == 0) {
newConfig->publicName = (char*)XMALLOC(XSTRLEN(publicName) + 1,
ctx->heap, DYNAMIC_TYPE_TMP_BUFFER);
if (newConfig->publicName == NULL) {
ret = MEMORY_E;
}
else {
XMEMCPY(newConfig->publicName, publicName,
XSTRLEN(publicName) + 1);
}
}
if (ret != 0) {
if (newConfig) {
XFREE(newConfig->cipherSuites, ctx->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(newConfig->publicName, ctx->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(newConfig, ctx->heap, DYNAMIC_TYPE_TMP_BUFFER);
}
}
else {
parentConfig = ctx->echConfigs;
if (parentConfig == NULL) {
ctx->echConfigs = newConfig;
}
else {
while (parentConfig->next != NULL) {
parentConfig = parentConfig->next;
}
parentConfig->next = newConfig;
}
}
if (ret == 0)
ret = WOLFSSL_SUCCESS;
#ifdef WOLFSSL_SMALL_STACK
XFREE(hpke, ctx->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(rng, ctx->heap, DYNAMIC_TYPE_RNG);
#endif
return ret;
}
int wolfSSL_CTX_SetEchConfigsBase64(WOLFSSL_CTX* ctx, const char* echConfigs64,
word32 echConfigs64Len)
{
int ret = 0;
word32 decodedLen = echConfigs64Len * 3 / 4 + 1;
byte* decodedConfigs;
if (ctx == NULL || echConfigs64 == NULL || echConfigs64Len == 0)
return BAD_FUNC_ARG;
decodedConfigs = (byte*)XMALLOC(decodedLen, ctx->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (decodedConfigs == NULL)
return MEMORY_E;
decodedConfigs[decodedLen - 1] = 0;
/* decode the echConfigs */
ret = Base64_Decode((const byte*)echConfigs64, echConfigs64Len,
decodedConfigs, &decodedLen);
if (ret != 0) {
XFREE(decodedConfigs, ctx->heap, DYNAMIC_TYPE_TMP_BUFFER);
return ret;
}
ret = wolfSSL_CTX_SetEchConfigs(ctx, decodedConfigs, decodedLen);
XFREE(decodedConfigs, ctx->heap, DYNAMIC_TYPE_TMP_BUFFER);
return ret;
}
int wolfSSL_CTX_SetEchConfigs(WOLFSSL_CTX* ctx, const byte* echConfigs,
word32 echConfigsLen)
{
int ret;
if (ctx == NULL || echConfigs == NULL || echConfigsLen == 0)
return BAD_FUNC_ARG;
FreeEchConfigs(ctx->echConfigs, ctx->heap);
ctx->echConfigs = NULL;
ret = SetEchConfigsEx(&ctx->echConfigs, ctx->heap, echConfigs,
echConfigsLen);
if (ret == 0)
return WOLFSSL_SUCCESS;
return ret;
}
/* get the ech configs that the server context is using */
int wolfSSL_CTX_GetEchConfigs(WOLFSSL_CTX* ctx, byte* output,
word32* outputLen) {
if (ctx == NULL || outputLen == NULL)
return BAD_FUNC_ARG;
/* if we don't have ech configs */
if (ctx->echConfigs == NULL)
return WOLFSSL_FATAL_ERROR;
return GetEchConfigsEx(ctx->echConfigs, output, outputLen);
}
void wolfSSL_CTX_SetEchEnable(WOLFSSL_CTX* ctx, byte enable)
{
if (ctx != NULL) {
ctx->disableECH = !enable;
if (ctx->disableECH) {
TLSX_Remove(&ctx->extensions, TLSX_ECH, ctx->heap);
FreeEchConfigs(ctx->echConfigs, ctx->heap);
ctx->echConfigs = NULL;
}
}
}
/* set the ech config from base64 for our client ssl object, base64 is the
* format ech configs are sent using dns records */
int wolfSSL_SetEchConfigsBase64(WOLFSSL* ssl, char* echConfigs64,
word32 echConfigs64Len)
{
int ret = 0;
word32 decodedLen = echConfigs64Len * 3 / 4 + 1;
byte* decodedConfigs;
if (ssl == NULL || echConfigs64 == NULL || echConfigs64Len == 0)
return BAD_FUNC_ARG;
/* already have ech configs */
if (ssl->options.useEch == 1) {
return WOLFSSL_FATAL_ERROR;
}
decodedConfigs = (byte*)XMALLOC(decodedLen, ssl->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (decodedConfigs == NULL)
return MEMORY_E;
decodedConfigs[decodedLen - 1] = 0;
/* decode the echConfigs */
ret = Base64_Decode((byte*)echConfigs64, echConfigs64Len,
decodedConfigs, &decodedLen);
if (ret != 0) {
XFREE(decodedConfigs, ssl->heap, DYNAMIC_TYPE_TMP_BUFFER);
return ret;
}
ret = wolfSSL_SetEchConfigs(ssl, decodedConfigs, decodedLen);
XFREE(decodedConfigs, ssl->heap, DYNAMIC_TYPE_TMP_BUFFER);
return ret;
}
/* set the ech config from a raw buffer, this is the format ech configs are
* sent using retry_configs from the ech server */
int wolfSSL_SetEchConfigs(WOLFSSL* ssl, const byte* echConfigs,
word32 echConfigsLen)
{
int ret;
if (ssl == NULL || echConfigs == NULL || echConfigsLen == 0)
return BAD_FUNC_ARG;
/* already have ech configs */
if (ssl->options.useEch == 1) {
return WOLFSSL_FATAL_ERROR;
}
ret = SetEchConfigsEx(&ssl->echConfigs, ssl->heap, echConfigs,
echConfigsLen);
/* if we found valid configs */
if (ret == 0) {
ssl->options.useEch = 1;
return WOLFSSL_SUCCESS;
}
return ret;
}
/* get the raw ech config from our struct */
int GetEchConfig(WOLFSSL_EchConfig* config, byte* output, word32* outputLen)
{
int i;
word16 totalLen = 0;
if (config == NULL || (output == NULL && outputLen == NULL))
return BAD_FUNC_ARG;
/* 2 for version */
totalLen += 2;
/* 2 for length */
totalLen += 2;
/* 1 for configId */
totalLen += 1;
/* 2 for kemId */
totalLen += 2;
/* 2 for hpke_len */
totalLen += 2;
/* hpke_pub_key */
switch (config->kemId) {
case DHKEM_P256_HKDF_SHA256:
totalLen += DHKEM_P256_ENC_LEN;
break;
case DHKEM_P384_HKDF_SHA384:
totalLen += DHKEM_P384_ENC_LEN;
break;
case DHKEM_P521_HKDF_SHA512:
totalLen += DHKEM_P521_ENC_LEN;
break;
case DHKEM_X25519_HKDF_SHA256:
totalLen += DHKEM_X25519_ENC_LEN;
break;
case DHKEM_X448_HKDF_SHA512:
totalLen += DHKEM_X448_ENC_LEN;
break;
}
/* cipherSuitesLen */
totalLen += 2;
/* cipherSuites */
totalLen += config->numCipherSuites * 4;
/* public name len */
totalLen += 2;
/* public name */
totalLen += XSTRLEN(config->publicName);
/* trailing zeros */
totalLen += 2;
if (output == NULL) {
*outputLen = totalLen;
return WC_NO_ERR_TRACE(LENGTH_ONLY_E);
}
if (totalLen > *outputLen) {
*outputLen = totalLen;
return INPUT_SIZE_E;
}
/* version */
c16toa(TLSX_ECH, output);
output += 2;
/* length - 4 for version and length itself */
c16toa(totalLen - 4, output);
output += 2;
/* configId */
*output = config->configId;
output++;
/* kemId */
c16toa(config->kemId, output);
output += 2;
/* length and key itself */
switch (config->kemId) {
case DHKEM_P256_HKDF_SHA256:
c16toa(DHKEM_P256_ENC_LEN, output);
output += 2;
XMEMCPY(output, config->receiverPubkey, DHKEM_P256_ENC_LEN);
output += DHKEM_P256_ENC_LEN;
break;
case DHKEM_P384_HKDF_SHA384:
c16toa(DHKEM_P384_ENC_LEN, output);
output += 2;
XMEMCPY(output, config->receiverPubkey, DHKEM_P384_ENC_LEN);
output += DHKEM_P384_ENC_LEN;
break;
case DHKEM_P521_HKDF_SHA512:
c16toa(DHKEM_P521_ENC_LEN, output);
output += 2;
XMEMCPY(output, config->receiverPubkey, DHKEM_P521_ENC_LEN);
output += DHKEM_P521_ENC_LEN;
break;
case DHKEM_X25519_HKDF_SHA256:
c16toa(DHKEM_X25519_ENC_LEN, output);
output += 2;
XMEMCPY(output, config->receiverPubkey, DHKEM_X25519_ENC_LEN);
output += DHKEM_X25519_ENC_LEN;
break;
case DHKEM_X448_HKDF_SHA512:
c16toa(DHKEM_X448_ENC_LEN, output);
output += 2;
XMEMCPY(output, config->receiverPubkey, DHKEM_X448_ENC_LEN);
output += DHKEM_X448_ENC_LEN;
break;
}
/* cipherSuites len */
c16toa(config->numCipherSuites * 4, output);
output += 2;
/* cipherSuites */
for (i = 0; i < config->numCipherSuites; i++) {
c16toa(config->cipherSuites[i].kdfId, output);
output += 2;
c16toa(config->cipherSuites[i].aeadId, output);
output += 2;
}
/* set maximum name length to 0 */
*output = 0;
output++;
/* publicName len */
*output = XSTRLEN(config->publicName);
output++;
/* publicName */
XMEMCPY(output, config->publicName,
XSTRLEN(config->publicName));
output += XSTRLEN(config->publicName);
/* terminating zeros */
c16toa(0, output);
/* output += 2; */
*outputLen = totalLen;
return 0;
}
/* wrapper function to get ech configs from application code */
int wolfSSL_GetEchConfigs(WOLFSSL* ssl, byte* output, word32* outputLen)
{
if (ssl == NULL || outputLen == NULL)
return BAD_FUNC_ARG;
/* if we don't have ech configs */
if (ssl->options.useEch != 1) {
return WOLFSSL_FATAL_ERROR;
}
return GetEchConfigsEx(ssl->echConfigs, output, outputLen);
}
void wolfSSL_SetEchEnable(WOLFSSL* ssl, byte enable)
{
if (ssl != NULL) {
ssl->options.disableECH = !enable;
if (ssl->options.disableECH) {
TLSX_Remove(&ssl->extensions, TLSX_ECH, ssl->heap);
FreeEchConfigs(ssl->echConfigs, ssl->heap);
ssl->echConfigs = NULL;
}
}
}
int SetEchConfigsEx(WOLFSSL_EchConfig** outputConfigs, void* heap,
const byte* echConfigs, word32 echConfigsLen)
{
int ret = 0;
int i;
int j;
word16 totalLength;
word16 version;
word16 length;
word16 hpkePubkeyLen;
word16 cipherSuitesLen;
word16 publicNameLen;
WOLFSSL_EchConfig* configList = NULL;
WOLFSSL_EchConfig* workingConfig = NULL;
WOLFSSL_EchConfig* lastConfig = NULL;
byte* echConfig = NULL;
if (outputConfigs == NULL || echConfigs == NULL || echConfigsLen == 0)
return BAD_FUNC_ARG;
/* check that the total length is well formed */
ato16(echConfigs, &totalLength);
if (totalLength != echConfigsLen - 2) {
return WOLFSSL_FATAL_ERROR;
}
/* skip the total length uint16_t */
i = 2;
do {
echConfig = (byte*)echConfigs + i;
ato16(echConfig, &version);
ato16(echConfig + 2, &length);
/* if the version does not match */
if (version != TLSX_ECH) {
/* we hit the end of the configs */
if ( (word32)i + 2 >= echConfigsLen ) {
break;
}
/* skip this config, +4 for version and length */
i += length + 4;
continue;
}
/* check if the length will overrun the buffer */
if ((word32)i + length + 4 > echConfigsLen) {
break;
}
if (workingConfig == NULL) {
workingConfig =
(WOLFSSL_EchConfig*)XMALLOC(sizeof(WOLFSSL_EchConfig), heap,
DYNAMIC_TYPE_TMP_BUFFER);
configList = workingConfig;
if (workingConfig != NULL) {
workingConfig->next = NULL;
}
}
else {
lastConfig = workingConfig;
workingConfig->next =
(WOLFSSL_EchConfig*)XMALLOC(sizeof(WOLFSSL_EchConfig),
heap, DYNAMIC_TYPE_TMP_BUFFER);
workingConfig = workingConfig->next;
}
if (workingConfig == NULL) {
ret = MEMORY_E;
break;
}
XMEMSET(workingConfig, 0, sizeof(WOLFSSL_EchConfig));
/* rawLen */
workingConfig->rawLen = length + 4;
/* raw body */
workingConfig->raw = (byte*)XMALLOC(workingConfig->rawLen,
heap, DYNAMIC_TYPE_TMP_BUFFER);
if (workingConfig->raw == NULL) {
ret = MEMORY_E;
break;
}
XMEMCPY(workingConfig->raw, echConfig, workingConfig->rawLen);
/* skip over version and length */
echConfig += 4;
/* configId, 1 byte */
workingConfig->configId = *(echConfig);
echConfig++;
/* kemId, 2 bytes */
ato16(echConfig, &workingConfig->kemId);
echConfig += 2;
/* hpke public_key length, 2 bytes */
ato16(echConfig, &hpkePubkeyLen);
echConfig += 2;
/* hpke public_key */
XMEMCPY(workingConfig->receiverPubkey, echConfig, hpkePubkeyLen);
echConfig += hpkePubkeyLen;
/* cipherSuitesLen */
ato16(echConfig, &cipherSuitesLen);
workingConfig->cipherSuites = (EchCipherSuite*)XMALLOC(cipherSuitesLen,
heap, DYNAMIC_TYPE_TMP_BUFFER);
if (workingConfig->cipherSuites == NULL) {
ret = MEMORY_E;
break;
}
echConfig += 2;
workingConfig->numCipherSuites = cipherSuitesLen / 4;
/* cipherSuites */
for (j = 0; j < workingConfig->numCipherSuites; j++) {
ato16(echConfig + j * 4, &workingConfig->cipherSuites[j].kdfId);
ato16(echConfig + j * 4 + 2,
&workingConfig->cipherSuites[j].aeadId);
}
echConfig += cipherSuitesLen;
/* ignore the maximum name length */
echConfig++;
/* publicNameLen */
publicNameLen = *(echConfig);
workingConfig->publicName = (char*)XMALLOC(publicNameLen + 1,
heap, DYNAMIC_TYPE_TMP_BUFFER);
if (workingConfig->publicName == NULL) {
ret = MEMORY_E;
break;
}
echConfig++;
/* publicName */
XMEMCPY(workingConfig->publicName, echConfig, publicNameLen);
/* null terminated */
workingConfig->publicName[publicNameLen] = 0;
/* add length to go to next config, +4 for version and length */
i += length + 4;
/* check that we support this config */
for (j = 0; j < HPKE_SUPPORTED_KEM_LEN; j++) {
if (hpkeSupportedKem[j] == workingConfig->kemId)
break;
}
/* if we don't support the kem or at least one cipher suite */
if (j >= HPKE_SUPPORTED_KEM_LEN ||
EchConfigGetSupportedCipherSuite(workingConfig) < 0)
{
XFREE(workingConfig->cipherSuites, heap,
DYNAMIC_TYPE_TMP_BUFFER);
XFREE(workingConfig->publicName, heap,
DYNAMIC_TYPE_TMP_BUFFER);
XFREE(workingConfig->raw, heap, DYNAMIC_TYPE_TMP_BUFFER);
workingConfig = lastConfig;
}
} while ((word32)i < echConfigsLen);
/* if we found valid configs */
if (ret == 0 && configList != NULL) {
*outputConfigs = configList;
return ret;
}
workingConfig = configList;
while (workingConfig != NULL) {
lastConfig = workingConfig;
workingConfig = workingConfig->next;
XFREE(lastConfig->cipherSuites, heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(lastConfig->publicName, heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(lastConfig->raw, heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(lastConfig, heap, DYNAMIC_TYPE_TMP_BUFFER);
}
if (ret == 0)