/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#if defined(ENABLE_QUIC) && \
(defined(USE_OPENSSL) || defined(USE_GNUTLS) || defined(USE_WOLFSSL))
#ifdef USE_OPENSSL
#include <openssl/err.h>
#include "vtls/openssl.h"
#elif defined(USE_GNUTLS)
#include <gnutls/abstract.h>
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#include <gnutls/crypto.h>
#include <nettle/sha2.h>
#include "vtls/gtls.h"
#elif defined(USE_WOLFSSL)
#include <wolfssl/options.h>
#include <wolfssl/ssl.h>
#include <wolfssl/quic.h>
#include "vtls/wolfssl.h"
#endif
#include "urldata.h"
#include "curl_trc.h"
#include "cfilters.h"
#include "multiif.h"
#include "vtls/keylog.h"
#include "vtls/vtls.h"
#include "vquic-tls.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
#ifndef ARRAYSIZE
#define ARRAYSIZE(A) (sizeof(A)/sizeof((A)[0]))
#endif
#ifdef USE_OPENSSL
#define QUIC_CIPHERS \
"TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_" \
"POLY1305_SHA256:TLS_AES_128_CCM_SHA256"
#define QUIC_GROUPS "P-256:X25519:P-384:P-521"
#elif defined(USE_GNUTLS)
#define QUIC_PRIORITY \
"NORMAL:-VERS-ALL:+VERS-TLS1.3:-CIPHER-ALL:+AES-128-GCM:+AES-256-GCM:" \
"+CHACHA20-POLY1305:+AES-128-CCM:-GROUP-ALL:+GROUP-SECP256R1:" \
"+GROUP-X25519:+GROUP-SECP384R1:+GROUP-SECP521R1:" \
"%DISABLE_TLS13_COMPAT_MODE"
#elif defined(USE_WOLFSSL)
#define QUIC_CIPHERS \
"TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_" \
"POLY1305_SHA256:TLS_AES_128_CCM_SHA256"
#define QUIC_GROUPS "P-256:P-384:P-521"
#endif
#ifdef USE_OPENSSL
static void keylog_callback(const SSL *ssl, const char *line)
{
(void)ssl;
Curl_tls_keylog_write_line(line);
}
static CURLcode curl_ossl_init_ctx(struct quic_tls_ctx *ctx,
struct Curl_cfilter *cf,
struct Curl_easy *data,
Curl_vquic_tls_ctx_setup *ctx_setup)
{
struct ssl_primary_config *conn_config;
CURLcode result = CURLE_FAILED_INIT;
DEBUGASSERT(!ctx->ssl_ctx);
#ifdef USE_OPENSSL_QUIC
ctx->ssl_ctx = SSL_CTX_new(OSSL_QUIC_client_method());
#else
ctx->ssl_ctx = SSL_CTX_new(TLS_method());
#endif
if(!ctx->ssl_ctx) {
result = CURLE_OUT_OF_MEMORY;
goto out;
}
conn_config = Curl_ssl_cf_get_primary_config(cf);
if(!conn_config) {
result = CURLE_FAILED_INIT;
goto out;
}
if(ctx_setup) {
result = ctx_setup(ctx, cf, data);
if(result)
goto out;
}
SSL_CTX_set_default_verify_paths(ctx->ssl_ctx);
{
const char *curves = conn_config->curves ?
conn_config->curves : QUIC_GROUPS;
if(!SSL_CTX_set1_curves_list(ctx->ssl_ctx, curves)) {
failf(data, "failed setting curves list for QUIC: '%s'", curves);
return CURLE_SSL_CIPHER;
}
}
#ifndef OPENSSL_IS_BORINGSSL
{
const char *ciphers13 = conn_config->cipher_list13 ?
conn_config->cipher_list13 : QUIC_CIPHERS;
if(SSL_CTX_set_ciphersuites(ctx->ssl_ctx, ciphers13) != 1) {
failf(data, "failed setting QUIC cipher suite: %s", ciphers13);
return CURLE_SSL_CIPHER;
}
infof(data, "QUIC cipher selection: %s", ciphers13);
}
#endif
/* Open the file if a TLS or QUIC backend has not done this before. */
Curl_tls_keylog_open();
if(Curl_tls_keylog_enabled()) {
SSL_CTX_set_keylog_callback(ctx->ssl_ctx, keylog_callback);
}
/* OpenSSL always tries to verify the peer, this only says whether it should
* fail to connect if the verification fails, or if it should continue
* anyway. In the latter case the result of the verification is checked with
* SSL_get_verify_result() below. */
SSL_CTX_set_verify(ctx->ssl_ctx, conn_config->verifypeer ?
SSL_VERIFY_PEER : SSL_VERIFY_NONE, NULL);
/* give application a chance to interfere with SSL set up. */
if(data->set.ssl.fsslctx) {
/* When a user callback is installed to modify the SSL_CTX,
* we need to do the full initialization before calling it.
* See: #11800 */
if(!ctx->x509_store_setup) {
result = Curl_ssl_setup_x509_store(cf, data, ctx->ssl_ctx);
if(result)
goto out;
ctx->x509_store_setup = TRUE;
}
Curl_set_in_callback(data, true);
result = (*data->set.ssl.fsslctx)(data, ctx->ssl_ctx,
data->set.ssl.fsslctxp);
Curl_set_in_callback(data, false);
if(result) {
failf(data, "error signaled by ssl ctx callback");
goto out;
}
}
result = CURLE_OK;
out:
if(result && ctx->ssl_ctx) {
SSL_CTX_free(ctx->ssl_ctx);
ctx->ssl_ctx = NULL;
}
return result;
}
static CURLcode curl_ossl_set_client_cert(struct quic_tls_ctx *ctx,
struct Curl_cfilter *cf,
struct Curl_easy *data)
{
SSL_CTX *ssl_ctx = ctx->ssl_ctx;
const struct ssl_config_data *ssl_config;
ssl_config = Curl_ssl_cf_get_config(cf, data);
DEBUGASSERT(ssl_config);
if(ssl_config->primary.clientcert ||
ssl_config->primary.cert_blob ||
ssl_config->cert_type) {
return Curl_ossl_set_client_cert(
data, ssl_ctx, ssl_config->primary.clientcert,
ssl_config->primary.cert_blob, ssl_config->cert_type,
ssl_config->key, ssl_config->key_blob,
ssl_config->key_type, ssl_config->key_passwd);
}
return CURLE_OK;
}
/** SSL callbacks ***/
static CURLcode curl_ossl_init_ssl(struct quic_tls_ctx *ctx,
struct Curl_easy *data,
struct ssl_peer *peer,
const char *alpn, size_t alpn_len,
void *user_data)
{
DEBUGASSERT(!ctx->ssl);
ctx->ssl = SSL_new(ctx->ssl_ctx);
SSL_set_app_data(ctx->ssl, user_data);
SSL_set_connect_state(ctx->ssl);
#ifndef USE_OPENSSL_QUIC
SSL_set_quic_use_legacy_codepoint(ctx->ssl, 0);
#endif
if(alpn)
SSL_set_alpn_protos(ctx->ssl, (const uint8_t *)alpn, (int)alpn_len);
if(peer->sni) {
if(!SSL_set_tlsext_host_name(ctx->ssl, peer->sni)) {
failf(data, "Failed set SNI");
SSL_free(ctx->ssl);
ctx->ssl = NULL;
return CURLE_QUIC_CONNECT_ERROR;
}
}
return CURLE_OK;
}
#elif defined(USE_GNUTLS)
static int keylog_callback(gnutls_session_t session, const char *label,
const gnutls_datum_t *secret)
{
gnutls_datum_t crandom;
gnutls_datum_t srandom;
gnutls_session_get_random(session, &crandom, &srandom);
if(crandom.size != 32) {
return -1;
}
Curl_tls_keylog_write(label, crandom.data, secret->data, secret->size);
return 0;
}
static CURLcode curl_gtls_init_ctx(struct quic_tls_ctx *ctx,
struct Curl_cfilter *cf,
struct Curl_easy *data,
struct ssl_peer *peer,
const char *alpn, size_t alpn_len,
Curl_vquic_tls_ctx_setup *ctx_setup,
void *user_data)
{
struct ssl_primary_config *conn_config;
CURLcode result;
gnutls_datum_t alpns[5];
/* this will need some attention when HTTPS proxy over QUIC get fixed */
long * const pverifyresult = &data->set.ssl.certverifyresult;
int rc;
conn_config = Curl_ssl_cf_get_primary_config(cf);
if(!conn_config)
return CURLE_FAILED_INIT;
DEBUGASSERT(ctx->gtls == NULL);
ctx->gtls = calloc(1, sizeof(*(ctx->gtls)));
if(!ctx->gtls)
return CURLE_OUT_OF_MEMORY;
result = gtls_client_init(data, conn_config, &data->set.ssl,
peer, ctx->gtls, pverifyresult);
if(result)
return result;
gnutls_session_set_ptr(ctx->gtls->session, user_data);
if(ctx_setup) {
result = ctx_setup(ctx, cf, data);
if(result)
return result;
}
rc = gnutls_priority_set_direct(ctx->gtls->session, QUIC_PRIORITY, NULL);
if(rc < 0) {
CURL_TRC_CF(data, cf, "gnutls_priority_set_direct failed: %s\n",
gnutls_strerror(rc));
return CURLE_QUIC_CONNECT_ERROR;
}
/* Open the file if a TLS or QUIC backend has not done this before. */
Curl_tls_keylog_open();
if(Curl_tls_keylog_enabled()) {
gnutls_session_set_keylog_function(ctx->gtls->session, keylog_callback);
}
/* convert the ALPN string from our arguments to a list of strings
* that gnutls wants and will convert internally back to this very
* string for sending to the server. nice. */
if(alpn) {
size_t i, alen = alpn_len;
unsigned char *s = (unsigned char *)alpn;
unsigned char slen;
for(i = 0; (i < ARRAYSIZE(alpns)) && alen; ++i) {
slen = s[0];
if(slen >= alen)
return CURLE_FAILED_INIT;
alpns[i].data = s + 1;
alpns[i].size = slen;
s += slen + 1;
alen -= (size_t)slen + 1;
}
if(alen) /* not all alpn chars used, wrong format or too many */
return CURLE_FAILED_INIT;
if(i) {
gnutls_alpn_set_protocols(ctx->gtls->session,
alpns, (unsigned int)i,
GNUTLS_ALPN_MANDATORY);
}
}
return CURLE_OK;
}
#elif defined(USE_WOLFSSL)
#if defined(HAVE_SECRET_CALLBACK)
static void keylog_callback(const WOLFSSL *ssl, const char *line)
{
(void)ssl;
Curl_tls_keylog_write_line(line);
}
#endif
static CURLcode curl_wssl_init_ctx(struct quic_tls_ctx *ctx,
struct Curl_cfilter *cf,
struct Curl_easy *data,
Curl_vquic_tls_ctx_setup *ctx_setup)
{
struct ssl_primary_config *conn_config;
CURLcode result = CURLE_FAILED_INIT;
conn_config = Curl_ssl_cf_get_primary_config(cf);
if(!conn_config) {
result = CURLE_FAILED_INIT;
goto out;
}
ctx->ssl_ctx = wolfSSL_CTX_new(wolfTLSv1_3_client_method());
if(!ctx->ssl_ctx) {
result = CURLE_OUT_OF_MEMORY;
goto out;
}
if(ctx_setup) {
result = ctx_setup(ctx, cf, data);
if(result)
goto out;
}
wolfSSL_CTX_set_default_verify_paths(ctx->ssl_ctx);
if(wolfSSL_CTX_set_cipher_list(ctx->ssl_ctx, conn_config->cipher_list13 ?
conn_config->cipher_list13 :
QUIC_CIPHERS) != 1) {
char error_buffer[256];
ERR_error_string_n(ERR_get_error(), error_buffer, sizeof(error_buffer));
failf(data, "wolfSSL failed to set ciphers: %s", error_buffer);
goto out;
}
if(wolfSSL_CTX_set1_groups_list(ctx->ssl_ctx, conn_config->curves ?
conn_config->curves :
(char *)QUIC_GROUPS) != 1) {
failf(data, "wolfSSL failed to set curves");
goto out;
}
/* Open the file if a TLS or QUIC backend has not done this before. */
Curl_tls_keylog_open();
if(Curl_tls_keylog_enabled()) {
#if defined(HAVE_SECRET_CALLBACK)
wolfSSL_CTX_set_keylog_callback(ctx->ssl_ctx, keylog_callback);
#else
failf(data, "wolfSSL was built without keylog callback");
goto out;
#endif
}
if(conn_config->verifypeer) {
const char * const ssl_cafile = conn_config->CAfile;
const char * const ssl_capath = conn_config->CApath;
wolfSSL_CTX_set_verify(ctx->ssl_ctx, SSL_VERIFY_PEER, NULL);
if(ssl_cafile || ssl_capath) {
/* tell wolfSSL where to find CA certificates that are used to verify
the server's certificate. */
int rc =
wolfSSL_CTX_load_verify_locations_ex(ctx->ssl_ctx, ssl_cafile,
ssl_capath,
WOLFSSL_LOAD_FLAG_IGNORE_ERR);
if(SSL_SUCCESS != rc) {
/* Fail if we insist on successfully verifying the server. */
failf(data, "error setting certificate verify locations:"
" CAfile: %s CApath: %s",
ssl_cafile ? ssl_cafile : "none",
ssl_capath ? ssl_capath : "none");
goto out;
}
infof(data, " CAfile: %s", ssl_cafile ? ssl_cafile : "none");
infof(data, " CApath: %s", ssl_capath ? ssl_capath : "none");
}
#ifdef CURL_CA_FALLBACK
else {
/* verifying the peer without any CA certificates won't work so
use wolfssl's built-in default as fallback */
wolfSSL_CTX_set_default_verify_paths(ctx->ssl_ctx);
}
#endif
}
else {
wolfSSL_CTX_set_verify(ctx->ssl_ctx, SSL_VERIFY_NONE, NULL);
}
/* give application a chance to interfere with SSL set up. */
if(data->set.ssl.fsslctx) {
Curl_set_in_callback(data, true);
result = (*data->set.ssl.fsslctx)(data, ctx->ssl_ctx,
data->set.ssl.fsslctxp);
Curl_set_in_callback(data, false);
if(result) {
failf(data, "error signaled by ssl ctx callback");
goto out;
}
}
result = CURLE_OK;
out:
if(result && ctx->ssl_ctx) {
SSL_CTX_free(ctx->ssl_ctx);
ctx->ssl_ctx = NULL;
}
return result;
}
/** SSL callbacks ***/
static CURLcode curl_wssl_init_ssl(struct quic_tls_ctx *ctx,
struct Curl_easy *data,
struct ssl_peer *peer,
const char *alpn, size_t alpn_len,
void *user_data)
{
(void)data;
DEBUGASSERT(!ctx->ssl);
DEBUGASSERT(ctx->ssl_ctx);
ctx->ssl = wolfSSL_new(ctx->ssl_ctx);
wolfSSL_set_app_data(ctx->ssl, user_data);
wolfSSL_set_connect_state(ctx->ssl);
wolfSSL_set_quic_use_legacy_codepoint(ctx->ssl, 0);
if(alpn)
wolfSSL_set_alpn_protos(ctx->ssl, (const unsigned char *)alpn,
(int)alpn_len);
if(peer->sni) {
wolfSSL_UseSNI(ctx->ssl, WOLFSSL_SNI_HOST_NAME,
peer->sni, (unsigned short)strlen(peer->sni));
}
return CURLE_OK;
}
#endif /* defined(USE_WOLFSSL) */
CURLcode Curl_vquic_tls_init(struct quic_tls_ctx *ctx,
struct Curl_cfilter *cf,
struct Curl_easy *data,
struct ssl_peer *peer,
const char *alpn, size_t alpn_len,
Curl_vquic_tls_ctx_setup *ctx_setup,
void *user_data)
{
CURLcode result;
#ifdef USE_OPENSSL
result = curl_ossl_init_ctx(ctx, cf, data, ctx_setup);
if(result)
return result;
result = curl_ossl_set_client_cert(ctx, cf, data);
if(result)
return result;
return curl_ossl_init_ssl(ctx, data, peer, alpn, alpn_len, user_data);
#elif defined(USE_GNUTLS)
(void)result;
return curl_gtls_init_ctx(ctx, cf, data, peer, alpn, alpn_len,
ctx_setup, user_data);
#elif defined(USE_WOLFSSL)
result = curl_wssl_init_ctx(ctx, cf, data, ctx_setup);
if(result)
return result;
return curl_wssl_init_ssl(ctx, data, peer, alpn, alpn_len, user_data);
#else
#error "no TLS lib in used, should not happen"
return CURLE_FAILED_INIT;
#endif
}
void Curl_vquic_tls_cleanup(struct quic_tls_ctx *ctx)
{
#ifdef USE_OPENSSL
if(ctx->ssl)
SSL_free(ctx->ssl);
if(ctx->ssl_ctx)
SSL_CTX_free(ctx->ssl_ctx);
#elif defined(USE_GNUTLS)
if(ctx->gtls) {
if(ctx->gtls->cred)
gnutls_certificate_free_credentials(ctx->gtls->cred);
if(ctx->gtls->session)
gnutls_deinit(ctx->gtls->session);
free(ctx->gtls);
}
#elif defined(USE_WOLFSSL)
if(ctx->ssl)
wolfSSL_free(ctx->ssl);
if(ctx->ssl_ctx)
wolfSSL_CTX_free(ctx->ssl_ctx);
#endif
memset(ctx, 0, sizeof(*ctx));
}
CURLcode Curl_vquic_tls_before_recv(struct quic_tls_ctx *ctx,
struct Curl_cfilter *cf,
struct Curl_easy *data)
{
#ifdef USE_OPENSSL
if(!ctx->x509_store_setup) {
CURLcode result = Curl_ssl_setup_x509_store(cf, data, ctx->ssl_ctx);
if(result)
return result;
ctx->x509_store_setup = TRUE;
}
#else
(void)ctx; (void)cf; (void)data;
#endif
return CURLE_OK;
}
CURLcode Curl_vquic_tls_verify_peer(struct quic_tls_ctx *ctx,
struct Curl_cfilter *cf,
struct Curl_easy *data,
struct ssl_peer *peer)
{
struct ssl_primary_config *conn_config;
CURLcode result = CURLE_OK;
conn_config = Curl_ssl_cf_get_primary_config(cf);
if(!conn_config)
return CURLE_FAILED_INIT;
if(conn_config->verifyhost) {
#ifdef USE_OPENSSL
X509 *server_cert;
server_cert = SSL_get1_peer_certificate(ctx->ssl);
if(!server_cert) {
return CURLE_PEER_FAILED_VERIFICATION;
}
result = Curl_ossl_verifyhost(data, cf->conn, peer, server_cert);
X509_free(server_cert);
if(result)
return result;
#elif defined(USE_GNUTLS)
result = Curl_gtls_verifyserver(data, ctx->gtls->session,
conn_config, &data->set.ssl, peer,
data->set.str[STRING_SSL_PINNEDPUBLICKEY]);
if(result)
return result;
#elif defined(USE_WOLFSSL)
if(!peer->sni ||
wolfSSL_check_domain_name(ctx->ssl, peer->sni) == SSL_FAILURE)
return CURLE_PEER_FAILED_VERIFICATION;
#endif
infof(data, "Verified certificate just fine");
}
else
infof(data, "Skipped certificate verification");
#ifdef USE_OPENSSL
if(data->set.ssl.certinfo)
/* asked to gather certificate info */
(void)Curl_ossl_certchain(data, ctx->ssl);
#endif
return result;
}
#endif /* !ENABLE_QUIC && (USE_OPENSSL || USE_GNUTLS || USE_WOLFSSL) */