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Re: [PATCH] QUIC: OpenSSL compatibility layer

Roman Arutyunyan
January 09, 2023 06:14AM
Hi,

On Wed, Dec 21, 2022 at 11:07:32AM +0400, Roman Arutyunyan wrote:
> # HG changeset patch
> # User Roman Arutyunyan <arut@nginx.com>
> # Date 1671606197 -14400
> # Wed Dec 21 11:03:17 2022 +0400
> # Branch quic
> # Node ID 64a365dcb52503e91d91c2084f56d072301e65f9
> # Parent b87a0dbc1150f415def5bc1e1f00d02b33519026
> QUIC: OpenSSL compatibility layer.
>
> The change allows to compile QUIC with OpenSSL, which lacks QUIC API.
>
> The layer is enabled by "--with-openssl-quic-compat" configure option.

Here's an updated version of the patch. The compatibility layer is now
enabled by default if BoringSSL QUIC API is not available. 0-RTT is not
supported in this version and will be done separately.

[..]

--
Roman Arutyunyan
# HG changeset patch
# User Roman Arutyunyan <arut@nginx.com>
# Date 1673262402 -14400
# Mon Jan 09 15:06:42 2023 +0400
# Branch quic
# Node ID 4e5dfe13c84fe50bec639f1b7dcc81604378a42b
# Parent aaa2a3831eefe4315dfb8a9be7178c79ff67f163
QUIC: OpenSSL compatibility layer.

The change allows to compile QUIC with OpenSSL which lacks BoringSSL QUIC API.

This implementation does not support 0-RTT.

diff --git a/README b/README
--- a/README
+++ b/README
@@ -53,7 +53,7 @@ 1. Introduction

2. Installing

- A library that provides QUIC support is required to build nginx, there
+ A library that provides QUIC support is recommended to build nginx, there
are several of those available on the market:
+ BoringSSL [4]
+ LibreSSL [5]
@@ -85,6 +85,10 @@ 2. Installing
--with-cc-opt="-I../libressl/build/include" \
--with-ld-opt="-L../libressl/build/lib"

+ Alternatively, nginx can be configured with OpenSSL compatibility
+ layer, which emulates BoringSSL QUIC API for OpenSSL. This mode is
+ enabled by default if native QUIC support is not detected.
+
When configuring nginx, it's possible to enable QUIC and HTTP/3
using the following new configuration options:

diff --git a/auto/lib/openssl/conf b/auto/lib/openssl/conf
--- a/auto/lib/openssl/conf
+++ b/auto/lib/openssl/conf
@@ -10,6 +10,7 @@ if [ $OPENSSL != NONE ]; then

if [ $USE_OPENSSL_QUIC = YES ]; then
have=NGX_QUIC . auto/have
+ have=NGX_QUIC_OPENSSL_COMPAT . auto/have
fi

case "$CC" in
@@ -124,6 +125,45 @@ else
CORE_INCS="$CORE_INCS $ngx_feature_path"
CORE_LIBS="$CORE_LIBS $ngx_feature_libs"
OPENSSL=YES
+
+ if [ $USE_OPENSSL_QUIC = YES ]; then
+
+ ngx_feature="OpenSSL QUIC support"
+ ngx_feature_name="NGX_OPENSSL_QUIC"
+ ngx_feature_run=no
+ ngx_feature_incs="#include <openssl/ssl.h>"
+ ngx_feature_test="SSL_set_quic_method(NULL, NULL)"
+ . auto/feature
+
+ if [ $ngx_found = no ]; then
+
+ ngx_feature="OpenSSL QUIC compatibility"
+ ngx_feature_name="NGX_QUIC_OPENSSL_COMPAT"
+ ngx_feature_run=no
+ ngx_feature_incs="#include <openssl/ssl.h>"
+ ngx_feature_test="
+ SSL_set_max_early_data(NULL, TLS1_3_VERSION);
+ SSL_CTX_set_msg_callback(NULL, NULL);
+ SSL_CTX_set_keylog_callback(NULL, NULL);
+ SSL_CTX_add_custom_ext(NULL, 0, 0, NULL, NULL,
+ NULL, NULL, NULL)"
+ . auto/feature
+ fi
+
+ if [ $ngx_found = no ]; then
+cat << END
+
+$0: error: certain modules require OpenSSL QUIC support.
+You can either do not enable the modules, or install the OpenSSL library with
+QUIC support into the system, or build the OpenSSL library with QUIC support
+statically from the source with nginx by using --with-openssl=<path> option.
+
+END
+ exit 1
+ fi
+
+ have=NGX_QUIC . auto/have
+ fi
fi
fi

@@ -139,29 +179,4 @@ with nginx by using --with-openssl=<path
END
exit 1
fi
-
- if [ $USE_OPENSSL_QUIC = YES ]; then
-
- ngx_feature="OpenSSL QUIC support"
- ngx_feature_name="NGX_QUIC"
- ngx_feature_run=no
- ngx_feature_incs="#include <openssl/ssl.h>"
- ngx_feature_path=
- ngx_feature_libs="-lssl -lcrypto $NGX_LIBDL $NGX_LIBPTHREAD"
- ngx_feature_test="SSL_set_quic_method(NULL, NULL)"
- . auto/feature
-
- if [ $ngx_found = no ]; then
-
-cat << END
-
-$0: error: certain modules require OpenSSL QUIC support.
-You can either do not enable the modules, or install the OpenSSL library with
-QUIC support into the system, or build the OpenSSL library with QUIC support
-statically from the source with nginx by using --with-openssl=<path> option.
-
-END
- exit 1
- fi
- fi
fi
diff --git a/auto/modules b/auto/modules
--- a/auto/modules
+++ b/auto/modules
@@ -1342,7 +1342,8 @@ if [ $USE_OPENSSL_QUIC = YES ]; then
src/event/quic/ngx_event_quic_tokens.h \
src/event/quic/ngx_event_quic_ack.h \
src/event/quic/ngx_event_quic_output.h \
- src/event/quic/ngx_event_quic_socket.h"
+ src/event/quic/ngx_event_quic_socket.h \
+ src/event/quic/ngx_event_quic_openssl_compat.h"
ngx_module_srcs="src/event/quic/ngx_event_quic.c \
src/event/quic/ngx_event_quic_udp.c \
src/event/quic/ngx_event_quic_transport.c \
@@ -1355,7 +1356,8 @@ if [ $USE_OPENSSL_QUIC = YES ]; then
src/event/quic/ngx_event_quic_tokens.c \
src/event/quic/ngx_event_quic_ack.c \
src/event/quic/ngx_event_quic_output.c \
- src/event/quic/ngx_event_quic_socket.c"
+ src/event/quic/ngx_event_quic_socket.c \
+ src/event/quic/ngx_event_quic_openssl_compat.c"

ngx_module_libs=
ngx_module_link=YES
diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -9,6 +9,10 @@
#include <ngx_core.h>
#include <ngx_event.h>

+#if (NGX_QUIC_OPENSSL_COMPAT)
+#include <ngx_event_quic_openssl_compat.h>
+#endif
+

#define NGX_SSL_PASSWORD_BUFFER_SIZE 4096

@@ -392,6 +396,10 @@ ngx_ssl_create(ngx_ssl_t *ssl, ngx_uint_

SSL_CTX_set_info_callback(ssl->ctx, ngx_ssl_info_callback);

+#if (NGX_QUIC_OPENSSL_COMPAT)
+ ngx_quic_compat_init(ssl->ctx);
+#endif
+
return NGX_OK;
}

diff --git a/src/event/quic/ngx_event_quic_connection.h b/src/event/quic/ngx_event_quic_connection.h
--- a/src/event/quic/ngx_event_quic_connection.h
+++ b/src/event/quic/ngx_event_quic_connection.h
@@ -24,6 +24,9 @@ typedef struct ngx_quic_send_ctx_s ng
typedef struct ngx_quic_socket_s ngx_quic_socket_t;
typedef struct ngx_quic_path_s ngx_quic_path_t;
typedef struct ngx_quic_keys_s ngx_quic_keys_t;
+#if (NGX_QUIC_OPENSSL_COMPAT)
+typedef struct ngx_quic_compat_s ngx_quic_compat_t;
+#endif

#include <ngx_event_quic_transport.h>
#include <ngx_event_quic_protection.h>
@@ -36,6 +39,9 @@ typedef struct ngx_quic_keys_s ng
#include <ngx_event_quic_ack.h>
#include <ngx_event_quic_output.h>
#include <ngx_event_quic_socket.h>
+#if (NGX_QUIC_OPENSSL_COMPAT)
+#include <ngx_event_quic_openssl_compat.h>
+#endif


/* RFC 9002, 6.2.2. Handshakes and New Paths: kInitialRtt */
@@ -236,6 +242,10 @@ struct ngx_quic_connection_s {
ngx_uint_t nshadowbufs;
#endif

+#if (NGX_QUIC_OPENSSL_COMPAT)
+ ngx_quic_compat_t *compat;
+#endif
+
ngx_quic_streams_t streams;
ngx_quic_congestion_t congestion;

diff --git a/src/event/quic/ngx_event_quic_openssl_compat.c b/src/event/quic/ngx_event_quic_openssl_compat.c
new file mode 100644
--- /dev/null
+++ b/src/event/quic/ngx_event_quic_openssl_compat.c
@@ -0,0 +1,656 @@
+
+/*
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_event.h>
+#include <ngx_event_quic_connection.h>
+
+
+#if (NGX_QUIC_OPENSSL_COMPAT)
+
+#define NGX_QUIC_COMPAT_RECORD_SIZE 1024
+
+#define NGX_QUIC_COMPAT_SSL_TP_EXT 0x39
+
+#define NGX_QUIC_COMPAT_CLIENT_EARLY "CLIENT_EARLY_TRAFFIC_SECRET"
+#define NGX_QUIC_COMPAT_CLIENT_HANDSHAKE "CLIENT_HANDSHAKE_TRAFFIC_SECRET"
+#define NGX_QUIC_COMPAT_SERVER_HANDSHAKE "SERVER_HANDSHAKE_TRAFFIC_SECRET"
+#define NGX_QUIC_COMPAT_CLIENT_APPLICATION "CLIENT_TRAFFIC_SECRET_0"
+#define NGX_QUIC_COMPAT_SERVER_APPLICATION "SERVER_TRAFFIC_SECRET_0"
+
+
+typedef struct {
+ ngx_quic_secret_t secret;
+ ngx_uint_t cipher;
+} ngx_quic_compat_keys_t;
+
+
+typedef struct {
+ ngx_log_t *log;
+
+ u_char type;
+ ngx_str_t payload;
+ uint64_t number;
+ ngx_quic_compat_keys_t *keys;
+
+ enum ssl_encryption_level_t level;
+} ngx_quic_compat_record_t;
+
+
+struct ngx_quic_compat_s {
+ const SSL_QUIC_METHOD *method;
+
+ enum ssl_encryption_level_t write_level;
+ enum ssl_encryption_level_t read_level;
+
+ uint64_t read_record;
+ ngx_quic_compat_keys_t keys;
+
+ ngx_str_t tp;
+ ngx_str_t ctp;
+};
+
+
+static void ngx_quic_compat_keylog_callback(const SSL *ssl, const char *line);
+static ngx_int_t ngx_quic_compat_set_encryption_secret(ngx_log_t *log,
+ ngx_quic_compat_keys_t *keys, enum ssl_encryption_level_t level,
+ const SSL_CIPHER *cipher, const uint8_t *secret, size_t secret_len);
+static int ngx_quic_compat_add_transport_params_callback(SSL *ssl,
+ unsigned int ext_type, unsigned int context, const unsigned char **out,
+ size_t *outlen, X509 *x, size_t chainidx, int *al, void *add_arg);
+static int ngx_quic_compat_parse_transport_params_callback(SSL *ssl,
+ unsigned int ext_type, unsigned int context, const unsigned char *in,
+ size_t inlen, X509 *x, size_t chainidx, int *al, void *parse_arg);
+static void ngx_quic_compat_message_callback(int write_p, int version,
+ int content_type, const void *buf, size_t len, SSL *ssl, void *arg);
+static size_t ngx_quic_compat_create_header(ngx_quic_compat_record_t *rec,
+ u_char *out, ngx_uint_t plain);
+static ngx_int_t ngx_quic_compat_create_record(ngx_quic_compat_record_t *rec,
+ ngx_str_t *res);
+
+
+ngx_int_t
+ngx_quic_compat_init(SSL_CTX *ctx)
+{
+ SSL_CTX_set_keylog_callback(ctx, ngx_quic_compat_keylog_callback);
+
+ if (SSL_CTX_add_custom_ext(ctx, NGX_QUIC_COMPAT_SSL_TP_EXT,
+ SSL_EXT_CLIENT_HELLO
+ |SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
+ ngx_quic_compat_add_transport_params_callback,
+ NULL,
+ NULL,
+ ngx_quic_compat_parse_transport_params_callback,
+ NULL)
+ == 0)
+ {
+ return NGX_ERROR;
+ }
+
+ return NGX_OK;
+}
+
+
+static void
+ngx_quic_compat_keylog_callback(const SSL *ssl, const char *line)
+{
+ u_char ch, *p, *start, value;
+ size_t n;
+ ngx_uint_t write;
+ const SSL_CIPHER *cipher;
+ ngx_quic_compat_t *com;
+ ngx_connection_t *c;
+ ngx_quic_connection_t *qc;
+ enum ssl_encryption_level_t level;
+ u_char secret[EVP_MAX_MD_SIZE];
+
+ c = ngx_ssl_get_connection(ssl);
+ if (c->type != SOCK_DGRAM) {
+ return;
+ }
+
+ p = (u_char *) line;
+
+ for (start = p; *p && *p != ' '; p++);
+
+ n = p - start;
+
+ ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
+ "quic compat secret %*s", n, start);
+
+ if (n == sizeof(NGX_QUIC_COMPAT_CLIENT_EARLY) - 1
+ && ngx_strncmp(start, NGX_QUIC_COMPAT_CLIENT_EARLY, n) == 0)
+ {
+ level = ssl_encryption_early_data;
+ write = 0;
+
+ } else if (n == sizeof(NGX_QUIC_COMPAT_CLIENT_HANDSHAKE) - 1
+ && ngx_strncmp(start, NGX_QUIC_COMPAT_CLIENT_HANDSHAKE, n) == 0)
+ {
+ level = ssl_encryption_handshake;
+ write = 0;
+
+ } else if (n == sizeof(NGX_QUIC_COMPAT_SERVER_HANDSHAKE) - 1
+ && ngx_strncmp(start, NGX_QUIC_COMPAT_SERVER_HANDSHAKE, n) == 0)
+ {
+ level = ssl_encryption_handshake;
+ write = 1;
+
+ } else if (n == sizeof(NGX_QUIC_COMPAT_CLIENT_APPLICATION) - 1
+ && ngx_strncmp(start, NGX_QUIC_COMPAT_CLIENT_APPLICATION, n)
+ == 0)
+ {
+ level = ssl_encryption_application;
+ write = 0;
+
+ } else if (n == sizeof(NGX_QUIC_COMPAT_SERVER_APPLICATION) - 1
+ && ngx_strncmp(start, NGX_QUIC_COMPAT_SERVER_APPLICATION, n)
+ == 0)
+ {
+ level = ssl_encryption_application;
+ write = 1;
+
+ } else {
+ return;
+ }
+
+ if (*p++ == '\0') {
+ return;
+ }
+
+ for ( /* void */ ; *p && *p != ' '; p++);
+
+ if (*p++ == '\0') {
+ return;
+ }
+
+ for (n = 0, start = p; *p; p++) {
+ ch = *p;
+
+ if (ch >= '0' && ch <= '9') {
+ value = ch - '0';
+ goto next;
+ }
+
+ ch = (u_char) (ch | 0x20);
+
+ if (ch >= 'a' && ch <= 'f') {
+ value = ch - 'a' + 10;
+ goto next;
+ }
+
+ ngx_log_error(NGX_LOG_EMERG, c->log, 0,
+ "invalid OpenSSL QUIC secret format");
+
+ return;
+
+ next:
+
+ if ((p - start) % 2) {
+ secret[n++] += value;
+
+ } else {
+ if (n >= EVP_MAX_MD_SIZE) {
+ ngx_log_error(NGX_LOG_EMERG, c->log, 0,
+ "too big OpenSSL QUIC secret");
+ return;
+ }
+
+ secret[n] = (value << 4);
+ }
+ }
+
+ qc = ngx_quic_get_connection(c);
+ com = qc->compat;
+ cipher = SSL_get_current_cipher(ssl);
+
+ if (write) {
+ com->method->set_write_secret((SSL *) ssl, level, cipher, secret, n);
+ com->write_level = level;
+
+ } else {
+ com->method->set_read_secret((SSL *) ssl, level, cipher, secret, n);
+ com->read_level = level;
+ com->read_record = 0;
+
+ (void) ngx_quic_compat_set_encryption_secret(c->log, &com->keys, level,
+ cipher, secret, n);
+ }
+}
+
+
+static ngx_int_t
+ngx_quic_compat_set_encryption_secret(ngx_log_t *log,
+ ngx_quic_compat_keys_t *keys, enum ssl_encryption_level_t level,
+ const SSL_CIPHER *cipher, const uint8_t *secret, size_t secret_len)
+{
+ ngx_int_t key_len;
+ ngx_str_t secret_str;
+ ngx_uint_t i;
+ ngx_quic_hkdf_t seq[2];
+ ngx_quic_secret_t *peer_secret;
+ ngx_quic_ciphers_t ciphers;
+
+ peer_secret = &keys->secret;
+
+ keys->cipher = SSL_CIPHER_get_id(cipher);
+
+ key_len = ngx_quic_ciphers(keys->cipher, &ciphers, level);
+
+ if (key_len == NGX_ERROR) {
+ ngx_ssl_error(NGX_LOG_INFO, log, 0, "unexpected cipher");
+ return NGX_ERROR;
+ }
+
+ if (sizeof(peer_secret->secret.data) < secret_len) {
+ ngx_log_error(NGX_LOG_ALERT, log, 0,
+ "unexpected secret len: %uz", secret_len);
+ return NGX_ERROR;
+ }
+
+ peer_secret->secret.len = secret_len;
+ ngx_memcpy(peer_secret->secret.data, secret, secret_len);
+
+ peer_secret->key.len = key_len;
+ peer_secret->iv.len = NGX_QUIC_IV_LEN;
+
+ secret_str.len = secret_len;
+ secret_str.data = (u_char *) secret;
+
+ ngx_quic_hkdf_set(&seq[0], "tls13 key", &peer_secret->key, &secret_str);
+ ngx_quic_hkdf_set(&seq[1], "tls13 iv", &peer_secret->iv, &secret_str);
+
+ for (i = 0; i < (sizeof(seq) / sizeof(seq[0])); i++) {
+ if (ngx_quic_hkdf_expand(&seq[i], ciphers.d, log) != NGX_OK) {
+ return NGX_ERROR;
+ }
+ }
+
+ return NGX_OK;
+}
+
+
+static int
+ngx_quic_compat_add_transport_params_callback(SSL *ssl, unsigned int ext_type,
+ unsigned int context, const unsigned char **out, size_t *outlen, X509 *x,
+ size_t chainidx, int *al, void *add_arg)
+{
+ ngx_connection_t *c;
+ ngx_quic_compat_t *com;
+ ngx_quic_connection_t *qc;
+
+ c = ngx_ssl_get_connection(ssl);
+ if (c->type != SOCK_DGRAM) {
+ return 0;
+ }
+
+ ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
+ "quic compat add transport params");
+
+ qc = ngx_quic_get_connection(c);
+ com = qc->compat;
+
+ *out = com->tp.data;
+ *outlen = com->tp.len;
+
+ return 1;
+}
+
+
+static int
+ngx_quic_compat_parse_transport_params_callback(SSL *ssl, unsigned int ext_type,
+ unsigned int context, const unsigned char *in, size_t inlen, X509 *x,
+ size_t chainidx, int *al, void *parse_arg)
+{
+ u_char *p;
+ ngx_connection_t *c;
+ ngx_quic_compat_t *com;
+ ngx_quic_connection_t *qc;
+
+ c = ngx_ssl_get_connection(ssl);
+ if (c->type != SOCK_DGRAM) {
+ return 0;
+ }
+
+ ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
+ "quic compat parse transport params");
+
+ qc = ngx_quic_get_connection(c);
+ com = qc->compat;
+
+ p = ngx_pnalloc(c->pool, inlen);
+ if (p == NULL) {
+ return 0;
+ }
+
+ ngx_memcpy(p, in, inlen);
+
+ com->ctp.data = p;
+ com->ctp.len = inlen;
+
+ return 1;
+}
+
+
+int
+SSL_set_quic_method(SSL *ssl, const SSL_QUIC_METHOD *quic_method)
+{
+ BIO *rbio, *wbio;
+ ngx_connection_t *c;
+ ngx_quic_compat_t *com;
+ ngx_quic_connection_t *qc;
+
+ c = ngx_ssl_get_connection(ssl);
+
+ ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic compat set method");
+
+ qc = ngx_quic_get_connection(c);
+
+ qc->compat = ngx_pcalloc(c->pool, sizeof(ngx_quic_compat_t));
+ if (qc->compat == NULL) {
+ return 0;
+ }
+
+ com = qc->compat;
+ com->method = quic_method;
+
+ rbio = BIO_new(BIO_s_mem());
+ if (rbio == NULL) {
+ return 0;
+ }
+
+ wbio = BIO_new(BIO_s_null());
+ if (wbio == NULL) {
+ return 0;
+ }
+
+ SSL_set_bio(ssl, rbio, wbio);
+
+ SSL_set_msg_callback(ssl, ngx_quic_compat_message_callback);
+
+ /* early data is not supported */
+ SSL_set_max_early_data(ssl, 0);
+
+ return 1;
+}
+
+
+static void
+ngx_quic_compat_message_callback(int write_p, int version, int content_type,
+ const void *buf, size_t len, SSL *ssl, void *arg)
+{
+ ngx_uint_t alert;
+ ngx_connection_t *c;
+ ngx_quic_compat_t *com;
+ ngx_quic_connection_t *qc;
+ enum ssl_encryption_level_t level;
+
+ if (!write_p) {
+ return;
+ }
+
+ c = ngx_ssl_get_connection(ssl);
+ qc = ngx_quic_get_connection(c);
+
+ if (qc == NULL) {
+ /* closing */
+ return;
+ }
+
+ com = qc->compat;
+ level = com->write_level;
+
+ switch (content_type) {
+
+ case SSL3_RT_HANDSHAKE:
+ ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
+ "quic compat tx %s len:%uz ",
+ ngx_quic_level_name(level), len);
+
+ (void) com->method->add_handshake_data(ssl, level, buf, len);
+
+ break;
+
+ case SSL3_RT_ALERT:
+ if (len >= 2) {
+ alert = ((u_char *) buf)[1];
+
+ ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
+ "quic compat %s alert:%ui len:%uz ",
+ ngx_quic_level_name(level), alert, len);
+
+ (void) com->method->send_alert(ssl, level, alert);
+
+ break;
+ }
+
+ /* fall through */
+
+ default:
+ ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
+ "quic compat %s ignore msg:%d len:%uz ",
+ ngx_quic_level_name(level), content_type, len);
+
+ break;
+ }
+}
+
+
+int
+SSL_provide_quic_data(SSL *ssl, enum ssl_encryption_level_t level,
+ const uint8_t *data, size_t len)
+{
+ BIO *rbio;
+ size_t n;
+ u_char *p;
+ ngx_str_t res;
+ ngx_connection_t *c;
+ ngx_quic_compat_t *com;
+ ngx_quic_connection_t *qc;
+ ngx_quic_compat_record_t rec;
+ u_char in[NGX_QUIC_COMPAT_RECORD_SIZE + 1];
+ u_char out[NGX_QUIC_COMPAT_RECORD_SIZE + 1
+ + SSL3_RT_HEADER_LENGTH
+ + EVP_GCM_TLS_TAG_LEN];
+
+ c = ngx_ssl_get_connection(ssl);
+
+ ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic compat rx %s len:%uz",
+ ngx_quic_level_name(level), len);
+
+ qc = ngx_quic_get_connection(c);
+ com = qc->compat;
+ rbio = SSL_get_rbio(ssl);
+
+ while (len) {
+ ngx_memzero(&rec, sizeof(ngx_quic_compat_record_t));
+
+ rec.type = SSL3_RT_HANDSHAKE;
+ rec.log = c->log;
+ rec.number = com->read_record++;
+ rec.keys = &com->keys;
+
+ if (level == ssl_encryption_initial) {
+ n = ngx_min(len, 65535);
+
+ rec.payload.len = n;
+ rec.payload.data = (u_char *) data;
+
+ ngx_quic_compat_create_header(&rec, out, 1);
+
+ BIO_write(rbio, out, SSL3_RT_HEADER_LENGTH);
+ BIO_write(rbio, data, n);
+
+#if defined(NGX_QUIC_DEBUG_CRYPTO) && defined(NGX_QUIC_DEBUG_PACKETS)
+ ngx_log_debug5(NGX_LOG_DEBUG_EVENT, c->log, 0,
+ "quic compat record len:%uz %*xs%*xs",
+ n + SSL3_RT_HEADER_LENGTH,
+ (size_t) SSL3_RT_HEADER_LENGTH, out, n, data);
+#endif
+
+ } else {
+ n = ngx_min(len, NGX_QUIC_COMPAT_RECORD_SIZE);
+
+ p = ngx_cpymem(in, data, n);
+ *p++ = SSL3_RT_HANDSHAKE;
+
+ rec.payload.len = p - in;
+ rec.payload.data = in;
+
+ res.data = out;
+
+ if (ngx_quic_compat_create_record(&rec, &res) != NGX_OK) {
+ return 0;
+ }
+
+#if defined(NGX_QUIC_DEBUG_CRYPTO) && defined(NGX_QUIC_DEBUG_PACKETS)
+ ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
+ "quic compat record len:%uz %xV", res.len, &res);
+#endif
+
+ BIO_write(rbio, res.data, res.len);
+ }
+
+ data += n;
+ len -= n;
+ }
+
+ return 1;
+}
+
+
+static size_t
+ngx_quic_compat_create_header(ngx_quic_compat_record_t *rec, u_char *out,
+ ngx_uint_t plain)
+{
+ u_char type;
+ size_t len;
+
+ len = rec->payload.len;
+
+ if (plain) {
+ type = rec->type;
+
+ } else {
+ type = SSL3_RT_APPLICATION_DATA;
+ len += EVP_GCM_TLS_TAG_LEN;
+ }
+
+ out[0] = type;
+ out[1] = 0x03;
+ out[2] = 0x03;
+ out[3] = (len >> 8);
+ out[4] = len;
+
+ return 5;
+}
+
+
+static ngx_int_t
+ngx_quic_compat_create_record(ngx_quic_compat_record_t *rec, ngx_str_t *res)
+{
+ ngx_str_t ad, out;
+ ngx_quic_secret_t *secret;
+ ngx_quic_ciphers_t ciphers;
+ u_char nonce[NGX_QUIC_IV_LEN];
+
+ ad.data = res->data;
+ ad.len = ngx_quic_compat_create_header(rec, ad.data, 0);
+
+ out.len = rec->payload.len + EVP_GCM_TLS_TAG_LEN;
+ out.data = res->data + ad.len;
+
+#ifdef NGX_QUIC_DEBUG_CRYPTO
+ ngx_log_debug2(NGX_LOG_DEBUG_EVENT, rec->log, 0,
+ "quic compat ad len:%uz %xV", ad.len, &ad);
+#endif
+
+ if (ngx_quic_ciphers(rec->keys->cipher, &ciphers, rec->level) == NGX_ERROR)
+ {
+ return NGX_ERROR;
+ }
+
+ secret = &rec->keys->secret;
+
+ ngx_memcpy(nonce, secret->iv.data, secret->iv.len);
+ ngx_quic_compute_nonce(nonce, sizeof(nonce), rec->number);
+
+ if (ngx_quic_tls_seal(ciphers.c, secret, &out,
+ nonce, &rec->payload, &ad, rec->log)
+ != NGX_OK)
+ {
+ return NGX_ERROR;
+ }
+
+ res->len = ad.len + out.len;
+
+ return NGX_OK;
+}
+
+
+enum ssl_encryption_level_t
+SSL_quic_read_level(const SSL *ssl)
+{
+ ngx_connection_t *c;
+ ngx_quic_connection_t *qc;
+
+ c = ngx_ssl_get_connection(ssl);
+ qc = ngx_quic_get_connection(c);
+
+ return qc->compat->read_level;
+}
+
+
+enum ssl_encryption_level_t
+SSL_quic_write_level(const SSL *ssl)
+{
+ ngx_connection_t *c;
+ ngx_quic_connection_t *qc;
+
+ c = ngx_ssl_get_connection(ssl);
+ qc = ngx_quic_get_connection(c);
+
+ return qc->compat->write_level;
+}
+
+
+int
+SSL_set_quic_transport_params(SSL *ssl, const uint8_t *params,
+ size_t params_len)
+{
+ ngx_connection_t *c;
+ ngx_quic_compat_t *com;
+ ngx_quic_connection_t *qc;
+
+ c = ngx_ssl_get_connection(ssl);
+ qc = ngx_quic_get_connection(c);
+ com = qc->compat;
+
+ com->tp.len = params_len;
+ com->tp.data = (u_char *) params;
+
+ return 1;
+}
+
+
+void
+SSL_get_peer_quic_transport_params(const SSL *ssl, const uint8_t **out_params,
+ size_t *out_params_len)
+{
+ ngx_connection_t *c;
+ ngx_quic_compat_t *com;
+ ngx_quic_connection_t *qc;
+
+ c = ngx_ssl_get_connection(ssl);
+ qc = ngx_quic_get_connection(c);
+ com = qc->compat;
+
+ *out_params = com->ctp.data;
+ *out_params_len = com->ctp.len;
+}
+
+#endif /* NGX_QUIC_OPENSSL_COMPAT */
diff --git a/src/event/quic/ngx_event_quic_openssl_compat.h b/src/event/quic/ngx_event_quic_openssl_compat.h
new file mode 100644
--- /dev/null
+++ b/src/event/quic/ngx_event_quic_openssl_compat.h
@@ -0,0 +1,51 @@
+
+/*
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#ifndef _NGX_EVENT_QUIC_OPENSSL_COMPAT_H_INCLUDED_
+#define _NGX_EVENT_QUIC_OPENSSL_COMPAT_H_INCLUDED_
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+
+enum ssl_encryption_level_t {
+ ssl_encryption_initial = 0,
+ ssl_encryption_early_data,
+ ssl_encryption_handshake,
+ ssl_encryption_application
+};
+
+
+typedef struct ssl_quic_method_st {
+ int (*set_read_secret)(SSL *ssl, enum ssl_encryption_level_t level,
+ const SSL_CIPHER *cipher,
+ const uint8_t *rsecret, size_t secret_len);
+ int (*set_write_secret)(SSL *ssl, enum ssl_encryption_level_t level,
+ const SSL_CIPHER *cipher,
+ const uint8_t *wsecret, size_t secret_len);
+ int (*add_handshake_data)(SSL *ssl, enum ssl_encryption_level_t level,
+ const uint8_t *data, size_t len);
+ int (*flush_flight)(SSL *ssl);
+ int (*send_alert)(SSL *ssl, enum ssl_encryption_level_t level,
+ uint8_t alert);
+} SSL_QUIC_METHOD;
+
+
+ngx_int_t ngx_quic_compat_init(SSL_CTX *ctx);
+
+int SSL_set_quic_method(SSL *ssl, const SSL_QUIC_METHOD *quic_method);
+int SSL_provide_quic_data(SSL *ssl, enum ssl_encryption_level_t level,
+ const uint8_t *data, size_t len);
+enum ssl_encryption_level_t SSL_quic_read_level(const SSL *ssl);
+enum ssl_encryption_level_t SSL_quic_write_level(const SSL *ssl);
+int SSL_set_quic_transport_params(SSL *ssl, const uint8_t *params,
+ size_t params_len);
+void SSL_get_peer_quic_transport_params(const SSL *ssl,
+ const uint8_t **out_params, size_t *out_params_len);
+
+
+#endif /* _NGX_EVENT_QUIC_OPENSSL_COMPAT_H_INCLUDED_ */
diff --git a/src/event/quic/ngx_event_quic_protection.c b/src/event/quic/ngx_event_quic_protection.c
--- a/src/event/quic/ngx_event_quic_protection.c
+++ b/src/event/quic/ngx_event_quic_protection.c
@@ -23,37 +23,6 @@
#endif


-#ifdef OPENSSL_IS_BORINGSSL
-#define ngx_quic_cipher_t EVP_AEAD
-#else
-#define ngx_quic_cipher_t EVP_CIPHER
-#endif
-
-
-typedef struct {
- const ngx_quic_cipher_t *c;
- const EVP_CIPHER *hp;
- const EVP_MD *d;
-} ngx_quic_ciphers_t;
-
-
-typedef struct {
- size_t out_len;
- u_char *out;
-
- size_t prk_len;
- const uint8_t *prk;
-
- size_t label_len;
- const u_char *label;
-} ngx_quic_hkdf_t;
-
-#define ngx_quic_hkdf_set(seq, _label, _out, _prk) \
- (seq)->out_len = (_out)->len; (seq)->out = (_out)->data; \
- (seq)->prk_len = (_prk)->len, (seq)->prk = (_prk)->data, \
- (seq)->label_len = (sizeof(_label) - 1); (seq)->label = (u_char *)(_label);
-
-
static ngx_int_t ngx_hkdf_expand(u_char *out_key, size_t out_len,
const EVP_MD *digest, const u_char *prk, size_t prk_len,
const u_char *info, size_t info_len);
@@ -63,20 +32,12 @@ static ngx_int_t ngx_hkdf_extract(u_char

static uint64_t ngx_quic_parse_pn(u_char **pos, ngx_int_t len, u_char *mask,
uint64_t *largest_pn);
-static void ngx_quic_compute_nonce(u_char *nonce, size_t len, uint64_t pn);
-static ngx_int_t ngx_quic_ciphers(ngx_uint_t id,
- ngx_quic_ciphers_t *ciphers, enum ssl_encryption_level_t level);

static ngx_int_t ngx_quic_tls_open(const ngx_quic_cipher_t *cipher,
ngx_quic_secret_t *s, ngx_str_t *out, u_char *nonce, ngx_str_t *in,
ngx_str_t *ad, ngx_log_t *log);
-static ngx_int_t ngx_quic_tls_seal(const ngx_quic_cipher_t *cipher,
- ngx_quic_secret_t *s, ngx_str_t *out, u_char *nonce, ngx_str_t *in,
- ngx_str_t *ad, ngx_log_t *log);
static ngx_int_t ngx_quic_tls_hp(ngx_log_t *log, const EVP_CIPHER *cipher,
ngx_quic_secret_t *s, u_char *out, u_char *in);
-static ngx_int_t ngx_quic_hkdf_expand(ngx_quic_hkdf_t *hkdf,
- const EVP_MD *digest, ngx_log_t *log);

static ngx_int_t ngx_quic_create_packet(ngx_quic_header_t *pkt,
ngx_str_t *res);
@@ -84,7 +45,7 @@ static ngx_int_t ngx_quic_create_retry_p
ngx_str_t *res);


-static ngx_int_t
+ngx_int_t
ngx_quic_ciphers(ngx_uint_t id, ngx_quic_ciphers_t *ciphers,
enum ssl_encryption_level_t level)
{
@@ -221,7 +182,7 @@ ngx_quic_keys_set_initial_secret(ngx_qui
}


-static ngx_int_t
+ngx_int_t
ngx_quic_hkdf_expand(ngx_quic_hkdf_t *h, const EVP_MD *digest, ngx_log_t *log)
{
size_t info_len;
@@ -480,7 +441,7 @@ ngx_quic_tls_open(const ngx_quic_cipher_
}


-static ngx_int_t
+ngx_int_t
ngx_quic_tls_seal(const ngx_quic_cipher_t *cipher, ngx_quic_secret_t *s,
ngx_str_t *out, u_char *nonce, ngx_str_t *in, ngx_str_t *ad, ngx_log_t *log)
{
@@ -961,7 +922,7 @@ ngx_quic_parse_pn(u_char **pos, ngx_int_
}


-static void
+void
ngx_quic_compute_nonce(u_char *nonce, size_t len, uint64_t pn)
{
nonce[len - 8] ^= (pn >> 56) & 0x3f;
diff --git a/src/event/quic/ngx_event_quic_protection.h b/src/event/quic/ngx_event_quic_protection.h
--- a/src/event/quic/ngx_event_quic_protection.h
+++ b/src/event/quic/ngx_event_quic_protection.h
@@ -23,6 +23,13 @@
#define NGX_QUIC_MAX_MD_SIZE 48


+#ifdef OPENSSL_IS_BORINGSSL
+#define ngx_quic_cipher_t EVP_AEAD
+#else
+#define ngx_quic_cipher_t EVP_CIPHER
+#endif
+
+
typedef struct {
size_t len;
u_char data[NGX_QUIC_MAX_MD_SIZE];
@@ -56,6 +63,30 @@ struct ngx_quic_keys_s {
};


+typedef struct {
+ const ngx_quic_cipher_t *c;
+ const EVP_CIPHER *hp;
+ const EVP_MD *d;
+} ngx_quic_ciphers_t;
+
+
+typedef struct {
+ size_t out_len;
+ u_char *out;
+
+ size_t prk_len;
+ const uint8_t *prk;
+
+ size_t label_len;
+ const u_char *label;
+} ngx_quic_hkdf_t;
+
+#define ngx_quic_hkdf_set(seq, _label, _out, _prk) \
+ (seq)->out_len = (_out)->len; (seq)->out = (_out)->data; \
+ (seq)->prk_len = (_prk)->len, (seq)->prk = (_prk)->data, \
+ (seq)->label_len = (sizeof(_label) - 1); (seq)->label = (u_char *)(_label);
+
+
ngx_int_t ngx_quic_keys_set_initial_secret(ngx_quic_keys_t *keys,
ngx_str_t *secret, ngx_log_t *log);
ngx_int_t ngx_quic_keys_set_encryption_secret(ngx_log_t *log,
@@ -70,6 +101,14 @@ void ngx_quic_keys_switch(ngx_connection
ngx_int_t ngx_quic_keys_update(ngx_connection_t *c, ngx_quic_keys_t *keys);
ngx_int_t ngx_quic_encrypt(ngx_quic_header_t *pkt, ngx_str_t *res);
ngx_int_t ngx_quic_decrypt(ngx_quic_header_t *pkt, uint64_t *largest_pn);
+void ngx_quic_compute_nonce(u_char *nonce, size_t len, uint64_t pn);
+ngx_int_t ngx_quic_ciphers(ngx_uint_t id, ngx_quic_ciphers_t *ciphers,
+ enum ssl_encryption_level_t level);
+ngx_int_t ngx_quic_tls_seal(const ngx_quic_cipher_t *cipher,
+ ngx_quic_secret_t *s, ngx_str_t *out, u_char *nonce, ngx_str_t *in,
+ ngx_str_t *ad, ngx_log_t *log);
+ngx_int_t ngx_quic_hkdf_expand(ngx_quic_hkdf_t *hkdf, const EVP_MD *digest,
+ ngx_log_t *log);


#endif /* _NGX_EVENT_QUIC_PROTECTION_H_INCLUDED_ */
diff --git a/src/event/quic/ngx_event_quic_ssl.c b/src/event/quic/ngx_event_quic_ssl.c
--- a/src/event/quic/ngx_event_quic_ssl.c
+++ b/src/event/quic/ngx_event_quic_ssl.c
@@ -10,6 +10,13 @@
#include <ngx_event_quic_connection.h>


+#if defined OPENSSL_IS_BORINGSSL \
+ || defined LIBRESSL_VERSION_NUMBER \
+ || NGX_QUIC_OPENSSL_COMPAT
+#define NGX_QUIC_BORINGSSL_API 1
+#endif
+
+
/*
* RFC 9000, 7.5. Cryptographic Message Buffering
*
@@ -18,7 +25,7 @@
#define NGX_QUIC_MAX_BUFFERED 65535


-#if defined OPENSSL_IS_BORINGSSL || defined LIBRESSL_VERSION_NUMBER
+#if (NGX_QUIC_BORINGSSL_API)
static int ngx_quic_set_read_secret(ngx_ssl_conn_t *ssl_conn,
enum ssl_encryption_level_t level, const SSL_CIPHER *cipher,
const uint8_t *secret, size_t secret_len);
@@ -39,7 +46,7 @@ static int ngx_quic_send_alert(ngx_ssl_c
static ngx_int_t ngx_quic_crypto_input(ngx_connection_t *c, ngx_chain_t *data);


-#if defined OPENSSL_IS_BORINGSSL || defined LIBRESSL_VERSION_NUMBER
+#if (NGX_QUIC_BORINGSSL_API)

static int
ngx_quic_set_read_secret(ngx_ssl_conn_t *ssl_conn,
@@ -67,12 +74,6 @@ ngx_quic_set_read_secret(ngx_ssl_conn_t
return 0;
}

- if (level == ssl_encryption_early_data) {
- if (ngx_quic_init_streams(c) != NGX_OK) {
- return 0;
- }
- }
-
return 1;
}

@@ -138,10 +139,6 @@ ngx_quic_set_encryption_secrets(ngx_ssl_
}

if (level == ssl_encryption_early_data) {
- if (ngx_quic_init_streams(c) != NGX_OK) {
- return 0;
- }
-
return 1;
}

@@ -456,6 +453,12 @@ ngx_quic_crypto_input(ngx_connection_t *
return NGX_ERROR;
}

+ if (ngx_quic_keys_available(qc->keys, ssl_encryption_early_data)) {
+ if (ngx_quic_init_streams(c) != NGX_OK) {
+ return NGX_ERROR;
+ }
+ }
+
return NGX_OK;
}

@@ -540,7 +543,7 @@ ngx_quic_init_connection(ngx_connection_
ssl_conn = c->ssl->connection;

if (!quic_method.send_alert) {
-#if defined OPENSSL_IS_BORINGSSL || defined LIBRESSL_VERSION_NUMBER
+#if (NGX_QUIC_BORINGSSL_API)
quic_method.set_read_secret = ngx_quic_set_read_secret;
quic_method.set_write_secret = ngx_quic_set_write_secret;
#else
diff --git a/src/event/quic/ngx_event_quic_transport.h b/src/event/quic/ngx_event_quic_transport.h
--- a/src/event/quic/ngx_event_quic_transport.h
+++ b/src/event/quic/ngx_event_quic_transport.h
@@ -11,6 +11,10 @@
#include <ngx_config.h>
#include <ngx_core.h>

+#if (NGX_QUIC_OPENSSL_COMPAT)
+#include <ngx_event_quic_openssl_compat.h>
+#endif
+

/*
* RFC 9000, 17.2. Long Header Packets
_______________________________________________
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Subject Author Views Posted

[PATCH] QUIC: OpenSSL compatibility layer

Roman Arutyunyan 480 December 21, 2022 02:08AM

Re: [PATCH] QUIC: OpenSSL compatibility layer

Roman Arutyunyan 15 January 09, 2023 06:14AM



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