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curl/lib/vquic/vquic-tls.c
Daniel Stenberg c074ba64a8
code: language cleanup in comments 
Based on the standards and guidelines we use for our documentation.

 - expand contractions (they're => they are etc)
 - host name = > hostname
 - file name => filename
 - user name = username
 - man page => manpage
 - run-time => runtime
 - set-up => setup
 - back-end => backend
 - a HTTP => an HTTP
 - Two spaces after a period => one space after period

Closes #14073
2024-07-01 22:58:55 +02:00

348 lines
11 KiB
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/***************************************************************************
* _ _ ____ _
* 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(USE_HTTP3) && \
(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
#if 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"
#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 curl_tls_ctx *ctx,
struct Curl_cfilter *cf,
struct Curl_easy *data,
Curl_vquic_tls_ctx_setup *cb_setup,
void *cb_user_data)
{
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->wssl.ctx = wolfSSL_CTX_new(wolfTLSv1_3_client_method());
if(!ctx->wssl.ctx) {
result = CURLE_OUT_OF_MEMORY;
goto out;
}
if(cb_setup) {
result = cb_setup(cf, data, cb_user_data);
if(result)
goto out;
}
wolfSSL_CTX_set_default_verify_paths(ctx->wssl.ctx);
if(wolfSSL_CTX_set_cipher_list(ctx->wssl.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);
result = CURLE_BAD_FUNCTION_ARGUMENT;
goto out;
}
if(wolfSSL_CTX_set1_groups_list(ctx->wssl.ctx, conn_config->curves ?
conn_config->curves :
(char *)QUIC_GROUPS) != 1) {
failf(data, "wolfSSL failed to set curves");
result = CURLE_BAD_FUNCTION_ARGUMENT;
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->wssl.ctx, keylog_callback);
#else
failf(data, "wolfSSL was built without keylog callback");
result = CURLE_NOT_BUILT_IN;
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->wssl.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->wssl.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");
result = CURLE_SSL_CACERT_BADFILE;
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 will not work so
use wolfssl's built-in default as fallback */
wolfSSL_CTX_set_default_verify_paths(ctx->wssl.ctx);
}
#endif
}
else {
wolfSSL_CTX_set_verify(ctx->wssl.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->wssl.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->wssl.ctx) {
SSL_CTX_free(ctx->wssl.ctx);
ctx->wssl.ctx = NULL;
}
return result;
}
/** SSL callbacks ***/
static CURLcode Curl_wssl_init_ssl(struct curl_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->wssl.handle);
DEBUGASSERT(ctx->wssl.ctx);
ctx->wssl.handle = wolfSSL_new(ctx->wssl.ctx);
wolfSSL_set_app_data(ctx->wssl.handle, user_data);
wolfSSL_set_connect_state(ctx->wssl.handle);
wolfSSL_set_quic_use_legacy_codepoint(ctx->wssl.handle, 0);
if(alpn)
wolfSSL_set_alpn_protos(ctx->wssl.handle, (const unsigned char *)alpn,
(unsigned int)alpn_len);
if(peer->sni) {
wolfSSL_UseSNI(ctx->wssl.handle, WOLFSSL_SNI_HOST_NAME,
peer->sni, (unsigned short)strlen(peer->sni));
}
return CURLE_OK;
}
#endif /* defined(USE_WOLFSSL) */
CURLcode Curl_vquic_tls_init(struct curl_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 *cb_setup,
void *cb_user_data, void *ssl_user_data)
{
CURLcode result;
#ifdef USE_OPENSSL
(void)result;
return Curl_ossl_ctx_init(&ctx->ossl, cf, data, peer, TRNSPRT_QUIC,
(const unsigned char *)alpn, alpn_len,
cb_setup, cb_user_data, NULL, ssl_user_data);
#elif defined(USE_GNUTLS)
(void)result;
return Curl_gtls_ctx_init(&ctx->gtls, cf, data, peer,
(const unsigned char *)alpn, alpn_len,
cb_setup, cb_user_data, ssl_user_data);
#elif defined(USE_WOLFSSL)
result = Curl_wssl_init_ctx(ctx, cf, data, cb_setup, cb_user_data);
if(result)
return result;
return Curl_wssl_init_ssl(ctx, data, peer, alpn, alpn_len, ssl_user_data);
#else
#error "no TLS lib in used, should not happen"
return CURLE_FAILED_INIT;
#endif
}
void Curl_vquic_tls_cleanup(struct curl_tls_ctx *ctx)
{
#ifdef USE_OPENSSL
if(ctx->ossl.ssl)
SSL_free(ctx->ossl.ssl);
if(ctx->ossl.ssl_ctx)
SSL_CTX_free(ctx->ossl.ssl_ctx);
#elif defined(USE_GNUTLS)
if(ctx->gtls.session)
gnutls_deinit(ctx->gtls.session);
Curl_gtls_shared_creds_free(&ctx->gtls.shared_creds);
#elif defined(USE_WOLFSSL)
if(ctx->wssl.handle)
wolfSSL_free(ctx->wssl.handle);
if(ctx->wssl.ctx)
wolfSSL_CTX_free(ctx->wssl.ctx);
#endif
memset(ctx, 0, sizeof(*ctx));
}
CURLcode Curl_vquic_tls_before_recv(struct curl_tls_ctx *ctx,
struct Curl_cfilter *cf,
struct Curl_easy *data)
{
#ifdef USE_OPENSSL
if(!ctx->ossl.x509_store_setup) {
CURLcode result = Curl_ssl_setup_x509_store(cf, data, ctx->ossl.ssl_ctx);
if(result)
return result;
ctx->ossl.x509_store_setup = TRUE;
}
#elif defined(USE_WOLFSSL)
if(!ctx->wssl.x509_store_setup) {
CURLcode result = Curl_wssl_setup_x509_store(cf, data, &ctx->wssl);
if(result)
return result;
}
#elif defined(USE_GNUTLS)
if(!ctx->gtls.shared_creds->trust_setup) {
CURLcode result = Curl_gtls_client_trust_setup(cf, data, &ctx->gtls);
if(result)
return result;
}
#else
(void)ctx; (void)cf; (void)data;
#endif
return CURLE_OK;
}
CURLcode Curl_vquic_tls_verify_peer(struct curl_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;
#ifdef USE_OPENSSL
(void)conn_config;
result = Curl_oss_check_peer_cert(cf, data, &ctx->ossl, peer);
#elif defined(USE_GNUTLS)
if(conn_config->verifyhost) {
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)
(void)data;
if(conn_config->verifyhost) {
if(peer->sni) {
WOLFSSL_X509* cert = wolfSSL_get_peer_certificate(ctx->wssl.handle);
if(wolfSSL_X509_check_host(cert, peer->sni, strlen(peer->sni), 0, NULL)
== WOLFSSL_FAILURE) {
result = CURLE_PEER_FAILED_VERIFICATION;
}
wolfSSL_X509_free(cert);
}
}
#endif
return result;
}
#endif /* !USE_HTTP3 && (USE_OPENSSL || USE_GNUTLS || USE_WOLFSSL) */
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