336 lines
8.4 KiB
C
336 lines
8.4 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Test key rotation for TFO.
|
||
|
|
* New keys are 'rotated' in two steps:
|
||
|
|
* 1) Add new key as the 'backup' key 'behind' the primary key
|
||
|
|
* 2) Make new key the primary by swapping the backup and primary keys
|
||
|
|
*
|
||
|
|
* The rotation is done in stages using multiple sockets bound
|
||
|
|
* to the same port via SO_REUSEPORT. This simulates key rotation
|
||
|
|
* behind say a load balancer. We verify that across the rotation
|
||
|
|
* there are no cases in which a cookie is not accepted by verifying
|
||
|
|
* that TcpExtTCPFastOpenPassiveFail remains 0.
|
||
|
|
*/
|
||
|
|
#define _GNU_SOURCE
|
||
|
|
#include <arpa/inet.h>
|
||
|
|
#include <errno.h>
|
||
|
|
#include <error.h>
|
||
|
|
#include <stdbool.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <sys/epoll.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <netinet/tcp.h>
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include <time.h>
|
||
|
|
|
||
|
|
#ifndef TCP_FASTOPEN_KEY
|
||
|
|
#define TCP_FASTOPEN_KEY 33
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define N_LISTEN 10
|
||
|
|
#define PROC_FASTOPEN_KEY "/proc/sys/net/ipv4/tcp_fastopen_key"
|
||
|
|
#define KEY_LENGTH 16
|
||
|
|
|
||
|
|
#ifndef ARRAY_SIZE
|
||
|
|
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static bool do_ipv6;
|
||
|
|
static bool do_sockopt;
|
||
|
|
static bool do_rotate;
|
||
|
|
static int key_len = KEY_LENGTH;
|
||
|
|
static int rcv_fds[N_LISTEN];
|
||
|
|
static int proc_fd;
|
||
|
|
static const char *IP4_ADDR = "127.0.0.1";
|
||
|
|
static const char *IP6_ADDR = "::1";
|
||
|
|
static const int PORT = 8891;
|
||
|
|
|
||
|
|
static void get_keys(int fd, uint32_t *keys)
|
||
|
|
{
|
||
|
|
char buf[128];
|
||
|
|
socklen_t len = KEY_LENGTH * 2;
|
||
|
|
|
||
|
|
if (do_sockopt) {
|
||
|
|
if (getsockopt(fd, SOL_TCP, TCP_FASTOPEN_KEY, keys, &len))
|
||
|
|
error(1, errno, "Unable to get key");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
lseek(proc_fd, 0, SEEK_SET);
|
||
|
|
if (read(proc_fd, buf, sizeof(buf)) <= 0)
|
||
|
|
error(1, errno, "Unable to read %s", PROC_FASTOPEN_KEY);
|
||
|
|
if (sscanf(buf, "%x-%x-%x-%x,%x-%x-%x-%x", keys, keys + 1, keys + 2,
|
||
|
|
keys + 3, keys + 4, keys + 5, keys + 6, keys + 7) != 8)
|
||
|
|
error(1, 0, "Unable to parse %s", PROC_FASTOPEN_KEY);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void set_keys(int fd, uint32_t *keys)
|
||
|
|
{
|
||
|
|
char buf[128];
|
||
|
|
|
||
|
|
if (do_sockopt) {
|
||
|
|
if (setsockopt(fd, SOL_TCP, TCP_FASTOPEN_KEY, keys,
|
||
|
|
key_len))
|
||
|
|
error(1, errno, "Unable to set key");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
if (do_rotate)
|
||
|
|
snprintf(buf, 128, "%08x-%08x-%08x-%08x,%08x-%08x-%08x-%08x",
|
||
|
|
keys[0], keys[1], keys[2], keys[3], keys[4], keys[5],
|
||
|
|
keys[6], keys[7]);
|
||
|
|
else
|
||
|
|
snprintf(buf, 128, "%08x-%08x-%08x-%08x",
|
||
|
|
keys[0], keys[1], keys[2], keys[3]);
|
||
|
|
lseek(proc_fd, 0, SEEK_SET);
|
||
|
|
if (write(proc_fd, buf, sizeof(buf)) <= 0)
|
||
|
|
error(1, errno, "Unable to write %s", PROC_FASTOPEN_KEY);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void build_rcv_fd(int family, int proto, int *rcv_fds)
|
||
|
|
{
|
||
|
|
struct sockaddr_in addr4 = {0};
|
||
|
|
struct sockaddr_in6 addr6 = {0};
|
||
|
|
struct sockaddr *addr;
|
||
|
|
int opt = 1, i, sz;
|
||
|
|
int qlen = 100;
|
||
|
|
uint32_t keys[8];
|
||
|
|
|
||
|
|
switch (family) {
|
||
|
|
case AF_INET:
|
||
|
|
addr4.sin_family = family;
|
||
|
|
addr4.sin_addr.s_addr = htonl(INADDR_ANY);
|
||
|
|
addr4.sin_port = htons(PORT);
|
||
|
|
sz = sizeof(addr4);
|
||
|
|
addr = (struct sockaddr *)&addr4;
|
||
|
|
break;
|
||
|
|
case AF_INET6:
|
||
|
|
addr6.sin6_family = AF_INET6;
|
||
|
|
addr6.sin6_addr = in6addr_any;
|
||
|
|
addr6.sin6_port = htons(PORT);
|
||
|
|
sz = sizeof(addr6);
|
||
|
|
addr = (struct sockaddr *)&addr6;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
error(1, 0, "Unsupported family %d", family);
|
||
|
|
/* clang does not recognize error() above as terminating
|
||
|
|
* the program, so it complains that saddr, sz are
|
||
|
|
* not initialized when this code path is taken. Silence it.
|
||
|
|
*/
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
for (i = 0; i < ARRAY_SIZE(keys); i++)
|
||
|
|
keys[i] = rand();
|
||
|
|
for (i = 0; i < N_LISTEN; i++) {
|
||
|
|
rcv_fds[i] = socket(family, proto, 0);
|
||
|
|
if (rcv_fds[i] < 0)
|
||
|
|
error(1, errno, "failed to create receive socket");
|
||
|
|
if (setsockopt(rcv_fds[i], SOL_SOCKET, SO_REUSEPORT, &opt,
|
||
|
|
sizeof(opt)))
|
||
|
|
error(1, errno, "failed to set SO_REUSEPORT");
|
||
|
|
if (bind(rcv_fds[i], addr, sz))
|
||
|
|
error(1, errno, "failed to bind receive socket");
|
||
|
|
if (setsockopt(rcv_fds[i], SOL_TCP, TCP_FASTOPEN, &qlen,
|
||
|
|
sizeof(qlen)))
|
||
|
|
error(1, errno, "failed to set TCP_FASTOPEN");
|
||
|
|
set_keys(rcv_fds[i], keys);
|
||
|
|
if (proto == SOCK_STREAM && listen(rcv_fds[i], 10))
|
||
|
|
error(1, errno, "failed to listen on receive port");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int connect_and_send(int family, int proto)
|
||
|
|
{
|
||
|
|
struct sockaddr_in saddr4 = {0};
|
||
|
|
struct sockaddr_in daddr4 = {0};
|
||
|
|
struct sockaddr_in6 saddr6 = {0};
|
||
|
|
struct sockaddr_in6 daddr6 = {0};
|
||
|
|
struct sockaddr *saddr, *daddr;
|
||
|
|
int fd, sz, ret;
|
||
|
|
char data[1];
|
||
|
|
|
||
|
|
switch (family) {
|
||
|
|
case AF_INET:
|
||
|
|
saddr4.sin_family = AF_INET;
|
||
|
|
saddr4.sin_addr.s_addr = htonl(INADDR_ANY);
|
||
|
|
saddr4.sin_port = 0;
|
||
|
|
|
||
|
|
daddr4.sin_family = AF_INET;
|
||
|
|
if (!inet_pton(family, IP4_ADDR, &daddr4.sin_addr.s_addr))
|
||
|
|
error(1, errno, "inet_pton failed: %s", IP4_ADDR);
|
||
|
|
daddr4.sin_port = htons(PORT);
|
||
|
|
|
||
|
|
sz = sizeof(saddr4);
|
||
|
|
saddr = (struct sockaddr *)&saddr4;
|
||
|
|
daddr = (struct sockaddr *)&daddr4;
|
||
|
|
break;
|
||
|
|
case AF_INET6:
|
||
|
|
saddr6.sin6_family = AF_INET6;
|
||
|
|
saddr6.sin6_addr = in6addr_any;
|
||
|
|
|
||
|
|
daddr6.sin6_family = AF_INET6;
|
||
|
|
if (!inet_pton(family, IP6_ADDR, &daddr6.sin6_addr))
|
||
|
|
error(1, errno, "inet_pton failed: %s", IP6_ADDR);
|
||
|
|
daddr6.sin6_port = htons(PORT);
|
||
|
|
|
||
|
|
sz = sizeof(saddr6);
|
||
|
|
saddr = (struct sockaddr *)&saddr6;
|
||
|
|
daddr = (struct sockaddr *)&daddr6;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
error(1, 0, "Unsupported family %d", family);
|
||
|
|
/* clang does not recognize error() above as terminating
|
||
|
|
* the program, so it complains that saddr, daddr, sz are
|
||
|
|
* not initialized when this code path is taken. Silence it.
|
||
|
|
*/
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
fd = socket(family, proto, 0);
|
||
|
|
if (fd < 0)
|
||
|
|
error(1, errno, "failed to create send socket");
|
||
|
|
if (bind(fd, saddr, sz))
|
||
|
|
error(1, errno, "failed to bind send socket");
|
||
|
|
data[0] = 'a';
|
||
|
|
ret = sendto(fd, data, 1, MSG_FASTOPEN, daddr, sz);
|
||
|
|
if (ret != 1)
|
||
|
|
error(1, errno, "failed to sendto");
|
||
|
|
|
||
|
|
return fd;
|
||
|
|
}
|
||
|
|
|
||
|
|
static bool is_listen_fd(int fd)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; i < N_LISTEN; i++) {
|
||
|
|
if (rcv_fds[i] == fd)
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void rotate_key(int fd)
|
||
|
|
{
|
||
|
|
static int iter;
|
||
|
|
static uint32_t new_key[4];
|
||
|
|
uint32_t keys[8];
|
||
|
|
uint32_t tmp_key[4];
|
||
|
|
int i;
|
||
|
|
|
||
|
|
if (iter < N_LISTEN) {
|
||
|
|
/* first set new key as backups */
|
||
|
|
if (iter == 0) {
|
||
|
|
for (i = 0; i < ARRAY_SIZE(new_key); i++)
|
||
|
|
new_key[i] = rand();
|
||
|
|
}
|
||
|
|
get_keys(fd, keys);
|
||
|
|
memcpy(keys + 4, new_key, KEY_LENGTH);
|
||
|
|
set_keys(fd, keys);
|
||
|
|
} else {
|
||
|
|
/* swap the keys */
|
||
|
|
get_keys(fd, keys);
|
||
|
|
memcpy(tmp_key, keys + 4, KEY_LENGTH);
|
||
|
|
memcpy(keys + 4, keys, KEY_LENGTH);
|
||
|
|
memcpy(keys, tmp_key, KEY_LENGTH);
|
||
|
|
set_keys(fd, keys);
|
||
|
|
}
|
||
|
|
if (++iter >= (N_LISTEN * 2))
|
||
|
|
iter = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void run_one_test(int family)
|
||
|
|
{
|
||
|
|
struct epoll_event ev;
|
||
|
|
int i, send_fd;
|
||
|
|
int n_loops = 10000;
|
||
|
|
int rotate_key_fd = 0;
|
||
|
|
int key_rotate_interval = 50;
|
||
|
|
int fd, epfd;
|
||
|
|
char buf[1];
|
||
|
|
|
||
|
|
build_rcv_fd(family, SOCK_STREAM, rcv_fds);
|
||
|
|
epfd = epoll_create(1);
|
||
|
|
if (epfd < 0)
|
||
|
|
error(1, errno, "failed to create epoll");
|
||
|
|
ev.events = EPOLLIN;
|
||
|
|
for (i = 0; i < N_LISTEN; i++) {
|
||
|
|
ev.data.fd = rcv_fds[i];
|
||
|
|
if (epoll_ctl(epfd, EPOLL_CTL_ADD, rcv_fds[i], &ev))
|
||
|
|
error(1, errno, "failed to register sock epoll");
|
||
|
|
}
|
||
|
|
while (n_loops--) {
|
||
|
|
send_fd = connect_and_send(family, SOCK_STREAM);
|
||
|
|
if (do_rotate && ((n_loops % key_rotate_interval) == 0)) {
|
||
|
|
rotate_key(rcv_fds[rotate_key_fd]);
|
||
|
|
if (++rotate_key_fd >= N_LISTEN)
|
||
|
|
rotate_key_fd = 0;
|
||
|
|
}
|
||
|
|
while (1) {
|
||
|
|
i = epoll_wait(epfd, &ev, 1, -1);
|
||
|
|
if (i < 0)
|
||
|
|
error(1, errno, "epoll_wait failed");
|
||
|
|
if (is_listen_fd(ev.data.fd)) {
|
||
|
|
fd = accept(ev.data.fd, NULL, NULL);
|
||
|
|
if (fd < 0)
|
||
|
|
error(1, errno, "failed to accept");
|
||
|
|
ev.data.fd = fd;
|
||
|
|
if (epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &ev))
|
||
|
|
error(1, errno, "failed epoll add");
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
i = recv(ev.data.fd, buf, sizeof(buf), 0);
|
||
|
|
if (i != 1)
|
||
|
|
error(1, errno, "failed recv data");
|
||
|
|
if (epoll_ctl(epfd, EPOLL_CTL_DEL, ev.data.fd, NULL))
|
||
|
|
error(1, errno, "failed epoll del");
|
||
|
|
close(ev.data.fd);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
close(send_fd);
|
||
|
|
}
|
||
|
|
for (i = 0; i < N_LISTEN; i++)
|
||
|
|
close(rcv_fds[i]);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void parse_opts(int argc, char **argv)
|
||
|
|
{
|
||
|
|
int c;
|
||
|
|
|
||
|
|
while ((c = getopt(argc, argv, "46sr")) != -1) {
|
||
|
|
switch (c) {
|
||
|
|
case '4':
|
||
|
|
do_ipv6 = false;
|
||
|
|
break;
|
||
|
|
case '6':
|
||
|
|
do_ipv6 = true;
|
||
|
|
break;
|
||
|
|
case 's':
|
||
|
|
do_sockopt = true;
|
||
|
|
break;
|
||
|
|
case 'r':
|
||
|
|
do_rotate = true;
|
||
|
|
key_len = KEY_LENGTH * 2;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
error(1, 0, "%s: parse error", argv[0]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
parse_opts(argc, argv);
|
||
|
|
proc_fd = open(PROC_FASTOPEN_KEY, O_RDWR);
|
||
|
|
if (proc_fd < 0)
|
||
|
|
error(1, errno, "Unable to open %s", PROC_FASTOPEN_KEY);
|
||
|
|
srand(time(NULL));
|
||
|
|
if (do_ipv6)
|
||
|
|
run_one_test(AF_INET6);
|
||
|
|
else
|
||
|
|
run_one_test(AF_INET);
|
||
|
|
close(proc_fd);
|
||
|
|
fprintf(stderr, "PASS\n");
|
||
|
|
return 0;
|
||
|
|
}
|