372 lines
11 KiB
C++
372 lines
11 KiB
C++
/*
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* nghttp2 - HTTP/2 C Library
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*
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* Copyright (c) 2021 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "shrpx_quic.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <netinet/udp.h>
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#include <array>
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#include <chrono>
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#include <ngtcp2/ngtcp2_crypto.h>
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#include <nghttp3/nghttp3.h>
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#include <openssl/rand.h>
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#include "shrpx_config.h"
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#include "shrpx_log.h"
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#include "util.h"
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#include "xsi_strerror.h"
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bool operator==(const ngtcp2_cid &lhs, const ngtcp2_cid &rhs) {
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return ngtcp2_cid_eq(&lhs, &rhs);
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}
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namespace shrpx {
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ngtcp2_tstamp quic_timestamp() {
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return std::chrono::duration_cast<std::chrono::nanoseconds>(
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std::chrono::steady_clock::now().time_since_epoch())
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.count();
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}
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int quic_send_packet(const UpstreamAddr *faddr, const sockaddr *remote_sa,
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size_t remote_salen, const sockaddr *local_sa,
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size_t local_salen, const ngtcp2_pkt_info &pi,
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const uint8_t *data, size_t datalen, size_t gso_size) {
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iovec msg_iov = {const_cast<uint8_t *>(data), datalen};
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msghdr msg{};
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msg.msg_name = const_cast<sockaddr *>(remote_sa);
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msg.msg_namelen = remote_salen;
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msg.msg_iov = &msg_iov;
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msg.msg_iovlen = 1;
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uint8_t msg_ctrl[
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#ifdef UDP_SEGMENT
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CMSG_SPACE(sizeof(uint16_t)) +
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#endif // UDP_SEGMENT
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CMSG_SPACE(sizeof(in6_pktinfo))];
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memset(msg_ctrl, 0, sizeof(msg_ctrl));
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msg.msg_control = msg_ctrl;
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msg.msg_controllen = sizeof(msg_ctrl);
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size_t controllen = 0;
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auto cm = CMSG_FIRSTHDR(&msg);
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switch (local_sa->sa_family) {
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case AF_INET: {
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controllen += CMSG_SPACE(sizeof(in_pktinfo));
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cm->cmsg_level = IPPROTO_IP;
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cm->cmsg_type = IP_PKTINFO;
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cm->cmsg_len = CMSG_LEN(sizeof(in_pktinfo));
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auto pktinfo = reinterpret_cast<in_pktinfo *>(CMSG_DATA(cm));
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memset(pktinfo, 0, sizeof(in_pktinfo));
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auto addrin =
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reinterpret_cast<sockaddr_in *>(const_cast<sockaddr *>(local_sa));
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pktinfo->ipi_spec_dst = addrin->sin_addr;
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break;
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}
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case AF_INET6: {
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controllen += CMSG_SPACE(sizeof(in6_pktinfo));
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cm->cmsg_level = IPPROTO_IPV6;
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cm->cmsg_type = IPV6_PKTINFO;
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cm->cmsg_len = CMSG_LEN(sizeof(in6_pktinfo));
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auto pktinfo = reinterpret_cast<in6_pktinfo *>(CMSG_DATA(cm));
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memset(pktinfo, 0, sizeof(in6_pktinfo));
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auto addrin =
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reinterpret_cast<sockaddr_in6 *>(const_cast<sockaddr *>(local_sa));
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pktinfo->ipi6_addr = addrin->sin6_addr;
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break;
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}
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default:
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assert(0);
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}
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#ifdef UDP_SEGMENT
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if (gso_size && datalen > gso_size) {
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controllen += CMSG_SPACE(sizeof(uint16_t));
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cm = CMSG_NXTHDR(&msg, cm);
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cm->cmsg_level = SOL_UDP;
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cm->cmsg_type = UDP_SEGMENT;
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cm->cmsg_len = CMSG_LEN(sizeof(uint16_t));
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*(reinterpret_cast<uint16_t *>(CMSG_DATA(cm))) = gso_size;
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}
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#endif // UDP_SEGMENT
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msg.msg_controllen = controllen;
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util::fd_set_send_ecn(faddr->fd, local_sa->sa_family, pi.ecn);
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ssize_t nwrite;
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do {
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nwrite = sendmsg(faddr->fd, &msg, 0);
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} while (nwrite == -1 && errno == EINTR);
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if (nwrite == -1) {
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if (LOG_ENABLED(INFO)) {
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auto error = errno;
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LOG(INFO) << "sendmsg failed: errno=" << error;
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}
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return -errno;
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}
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if (LOG_ENABLED(INFO)) {
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LOG(INFO) << "QUIC sent packet: local="
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<< util::to_numeric_addr(local_sa, local_salen)
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<< " remote=" << util::to_numeric_addr(remote_sa, remote_salen)
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<< " ecn=" << log::hex << pi.ecn << log::dec << " " << nwrite
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<< " bytes";
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}
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return 0;
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}
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int generate_quic_retry_connection_id(ngtcp2_cid &cid, size_t cidlen,
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const uint8_t *server_id, uint8_t km_id,
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const uint8_t *key) {
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assert(cidlen == SHRPX_QUIC_SCIDLEN);
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if (RAND_bytes(cid.data, cidlen) != 1) {
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return -1;
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}
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cid.datalen = cidlen;
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cid.data[0] = (cid.data[0] & 0x3f) | km_id;
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auto p = cid.data + SHRPX_QUIC_CID_PREFIX_OFFSET;
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std::copy_n(server_id, SHRPX_QUIC_SERVER_IDLEN, p);
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return encrypt_quic_connection_id(p, p, key);
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}
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int generate_quic_connection_id(ngtcp2_cid &cid, size_t cidlen,
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const uint8_t *cid_prefix, uint8_t km_id,
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const uint8_t *key) {
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assert(cidlen == SHRPX_QUIC_SCIDLEN);
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if (RAND_bytes(cid.data, cidlen) != 1) {
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return -1;
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}
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cid.datalen = cidlen;
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cid.data[0] = (cid.data[0] & 0x3f) | km_id;
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auto p = cid.data + SHRPX_QUIC_CID_PREFIX_OFFSET;
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std::copy_n(cid_prefix, SHRPX_QUIC_CID_PREFIXLEN, p);
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return encrypt_quic_connection_id(p, p, key);
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}
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int encrypt_quic_connection_id(uint8_t *dest, const uint8_t *src,
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const uint8_t *key) {
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auto ctx = EVP_CIPHER_CTX_new();
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auto d = defer(EVP_CIPHER_CTX_free, ctx);
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if (!EVP_EncryptInit_ex(ctx, EVP_aes_128_ecb(), nullptr, key, nullptr)) {
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return -1;
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}
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EVP_CIPHER_CTX_set_padding(ctx, 0);
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int len;
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if (!EVP_EncryptUpdate(ctx, dest, &len, src, SHRPX_QUIC_DECRYPTED_DCIDLEN) ||
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!EVP_EncryptFinal_ex(ctx, dest + len, &len)) {
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return -1;
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}
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return 0;
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}
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int decrypt_quic_connection_id(uint8_t *dest, const uint8_t *src,
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const uint8_t *key) {
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auto ctx = EVP_CIPHER_CTX_new();
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auto d = defer(EVP_CIPHER_CTX_free, ctx);
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if (!EVP_DecryptInit_ex(ctx, EVP_aes_128_ecb(), nullptr, key, nullptr)) {
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return -1;
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}
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EVP_CIPHER_CTX_set_padding(ctx, 0);
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int len;
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if (!EVP_DecryptUpdate(ctx, dest, &len, src, SHRPX_QUIC_DECRYPTED_DCIDLEN) ||
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!EVP_DecryptFinal_ex(ctx, dest + len, &len)) {
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return -1;
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}
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return 0;
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}
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int generate_quic_hashed_connection_id(ngtcp2_cid &dest,
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const Address &remote_addr,
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const Address &local_addr,
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const ngtcp2_cid &cid) {
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auto ctx = EVP_MD_CTX_new();
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auto d = defer(EVP_MD_CTX_free, ctx);
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std::array<uint8_t, 32> h;
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unsigned int hlen = EVP_MD_size(EVP_sha256());
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if (!EVP_DigestInit_ex(ctx, EVP_sha256(), nullptr) ||
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!EVP_DigestUpdate(ctx, &remote_addr.su.sa, remote_addr.len) ||
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!EVP_DigestUpdate(ctx, &local_addr.su.sa, local_addr.len) ||
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!EVP_DigestUpdate(ctx, cid.data, cid.datalen) ||
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!EVP_DigestFinal_ex(ctx, h.data(), &hlen)) {
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return -1;
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}
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assert(hlen == h.size());
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std::copy_n(std::begin(h), sizeof(dest.data), std::begin(dest.data));
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dest.datalen = sizeof(dest.data);
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return 0;
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}
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int generate_quic_stateless_reset_token(uint8_t *token, const ngtcp2_cid &cid,
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const uint8_t *secret,
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size_t secretlen) {
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if (ngtcp2_crypto_generate_stateless_reset_token(token, secret, secretlen,
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&cid) != 0) {
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return -1;
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}
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return 0;
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}
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int generate_retry_token(uint8_t *token, size_t &tokenlen, uint32_t version,
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const sockaddr *sa, socklen_t salen,
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const ngtcp2_cid &retry_scid, const ngtcp2_cid &odcid,
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const uint8_t *secret, size_t secretlen) {
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auto t = std::chrono::duration_cast<std::chrono::nanoseconds>(
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std::chrono::system_clock::now().time_since_epoch())
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.count();
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auto stokenlen = ngtcp2_crypto_generate_retry_token(
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token, secret, secretlen, version, sa, salen, &retry_scid, &odcid, t);
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if (stokenlen < 0) {
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return -1;
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}
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tokenlen = stokenlen;
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return 0;
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}
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int verify_retry_token(ngtcp2_cid &odcid, const uint8_t *token, size_t tokenlen,
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uint32_t version, const ngtcp2_cid &dcid,
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const sockaddr *sa, socklen_t salen,
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const uint8_t *secret, size_t secretlen) {
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auto t = std::chrono::duration_cast<std::chrono::nanoseconds>(
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std::chrono::system_clock::now().time_since_epoch())
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.count();
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if (ngtcp2_crypto_verify_retry_token(&odcid, token, tokenlen, secret,
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secretlen, version, sa, salen, &dcid,
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10 * NGTCP2_SECONDS, t) != 0) {
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return -1;
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}
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return 0;
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}
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int generate_token(uint8_t *token, size_t &tokenlen, const sockaddr *sa,
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size_t salen, const uint8_t *secret, size_t secretlen) {
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auto t = std::chrono::duration_cast<std::chrono::nanoseconds>(
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std::chrono::system_clock::now().time_since_epoch())
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.count();
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auto stokenlen = ngtcp2_crypto_generate_regular_token(
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token, secret, secretlen, sa, salen, t);
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if (stokenlen < 0) {
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return -1;
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}
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tokenlen = stokenlen;
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return 0;
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}
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int verify_token(const uint8_t *token, size_t tokenlen, const sockaddr *sa,
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socklen_t salen, const uint8_t *secret, size_t secretlen) {
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auto t = std::chrono::duration_cast<std::chrono::nanoseconds>(
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std::chrono::system_clock::now().time_since_epoch())
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.count();
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if (ngtcp2_crypto_verify_regular_token(token, tokenlen, secret, secretlen, sa,
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salen, 3600 * NGTCP2_SECONDS,
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t) != 0) {
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return -1;
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}
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return 0;
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}
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int generate_quic_connection_id_encryption_key(uint8_t *key, size_t keylen,
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const uint8_t *secret,
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size_t secretlen,
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const uint8_t *salt,
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size_t saltlen) {
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constexpr uint8_t info[] = "connection id encryption key";
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ngtcp2_crypto_md sha256;
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ngtcp2_crypto_md_init(
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&sha256, reinterpret_cast<void *>(const_cast<EVP_MD *>(EVP_sha256())));
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if (ngtcp2_crypto_hkdf(key, keylen, &sha256, secret, secretlen, salt, saltlen,
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info, str_size(info)) != 0) {
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return -1;
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}
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return 0;
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}
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const QUICKeyingMaterial *
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select_quic_keying_material(const QUICKeyingMaterials &qkms, uint8_t km_id) {
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for (auto &qkm : qkms.keying_materials) {
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if (km_id == qkm.id) {
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return &qkm;
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}
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}
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return &qkms.keying_materials.front();
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}
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} // namespace shrpx
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