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