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curvetun_server.c
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/*
* curvetun - the cipherspace wormhole creator
* Part of the netsniff-ng project
* Copyright 2011 Daniel Borkmann <daniel@netsniff-ng.org>,
* Subject to the GPL, version 2.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#include <syslog.h>
#include <signal.h>
#include <netdb.h>
#include <stdint.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <poll.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/epoll.h>
#include <arpa/inet.h>
#include <linux/if_tun.h>
#include "die.h"
#include "epoll2.h"
#include "ioops.h"
#include "xmalloc.h"
#include "curvetun.h"
#include "curve.h"
#include "ioexact.h"
#include "corking.h"
#include "cpus.h"
#include "sock.h"
#include "built_in.h"
#include "curvetun_mgmt.h"
#include "cpusched.h"
#include "trie.h"
struct parent_info {
int efd;
int refd;
int tunfd;
int ipv4;
int udp;
};
struct worker_struct {
pthread_t trid;
int efd[2];
unsigned int cpu;
struct parent_info parent;
int (*handler)(int fd, const struct worker_struct *ws,
char *buff, size_t len);
struct curve25519_struct *c;
};
static struct worker_struct *threadpool = NULL;
static int auth_log = 1;
extern volatile sig_atomic_t sigint;
static int handler_udp_tun_to_net(int fd, const struct worker_struct *ws,
char *buff, size_t len) __pure;
static int handler_udp_net_to_tun(int fd, const struct worker_struct *ws,
char *buff, size_t len) __pure;
static int handler_udp(int fd, const struct worker_struct *ws,
char *buff, size_t len) __pure;
static int handler_tcp_tun_to_net(int fd, const struct worker_struct *ws,
char *buff, size_t len) __pure;
static int handler_tcp_net_to_tun(int fd, const struct worker_struct *ws,
char *buff, size_t len) __pure;
static int handler_tcp(int fd, const struct worker_struct *ws,
char *buff, size_t len) __pure;
ssize_t handler_tcp_read(int fd, char *buff, size_t len);
static void *worker(void *self) __pure;
static int handler_udp_tun_to_net(int fd, const struct worker_struct *ws,
char *buff, size_t len)
{
int dfd, keep = 1;
char *cbuff;
ssize_t rlen, err, clen;
struct ct_proto *hdr;
struct curve25519_proto *p;
struct sockaddr_storage naddr;
socklen_t nlen;
size_t off = sizeof(struct ct_proto) + crypto_box_zerobytes;
if (!buff || len <= off)
return 0;
memset(buff, 0, len);
while ((rlen = read(fd, buff + off, len - off)) > 0) {
dfd = -1; nlen = 0; p = NULL;
memset(&naddr, 0, sizeof(naddr));
hdr = (struct ct_proto *) buff;
memset(hdr, 0, sizeof(*hdr));
hdr->flags = 0;
trie_addr_lookup(buff + off, rlen, ws->parent.ipv4, &dfd, &naddr,
(size_t *) &nlen);
if (unlikely(dfd < 0 || nlen == 0)) {
memset(buff, 0, len);
continue;
}
err = get_user_by_sockaddr(&naddr, nlen, &p);
if (unlikely(err || !p)) {
memset(buff, 0, len);
continue;
}
clen = curve25519_encode(ws->c, p, (unsigned char *) (buff + off -
crypto_box_zerobytes), (rlen +
crypto_box_zerobytes), (unsigned char **)
&cbuff);
if (unlikely(clen <= 0)) {
memset(buff, 0, len);
continue;
}
hdr->payload = htons((uint16_t) clen);
set_udp_cork(dfd);
sendto(dfd, hdr, sizeof(struct ct_proto), 0, (struct sockaddr *)
&naddr, nlen);
sendto(dfd, cbuff, clen, 0, (struct sockaddr *) &naddr, nlen);
set_udp_uncork(dfd);
memset(buff, 0, len);
}
return keep;
}
static void handler_udp_notify_close(int fd, struct sockaddr_storage *addr)
{
struct ct_proto hdr;
memset(&hdr, 0, sizeof(hdr));
hdr.flags |= PROTO_FLAG_EXIT;
hdr.payload = 0;
sendto(fd, &hdr, sizeof(hdr), 0, (struct sockaddr *) addr,
sizeof(*addr));
}
static int handler_udp_net_to_tun(int fd, const struct worker_struct *ws,
char *buff, size_t len)
{
int keep = 1;
char *cbuff;
ssize_t rlen, err, clen;
struct ct_proto *hdr;
struct curve25519_proto *p;
struct sockaddr_storage naddr;
socklen_t nlen = sizeof(naddr);
if (!buff || !len)
return 0;
memset(&naddr, 0, sizeof(naddr));
while ((rlen = recvfrom(fd, buff, len, 0, (struct sockaddr *) &naddr,
&nlen)) > 0) {
p = NULL;
hdr = (struct ct_proto *) buff;
if (unlikely(rlen < sizeof(struct ct_proto)))
goto close;
if (unlikely(rlen - sizeof(*hdr) != ntohs(hdr->payload)))
goto close;
if (unlikely(ntohs(hdr->payload) == 0))
goto close;
if (hdr->flags & PROTO_FLAG_EXIT) {
close:
remove_user_by_sockaddr(&naddr, nlen);
trie_addr_remove_addr(&naddr, nlen);
handler_udp_notify_close(fd, &naddr);
return keep;
}
if (hdr->flags & PROTO_FLAG_INIT) {
syslog_maybe(auth_log, LOG_INFO, "Got initial userhash "
"from remote end!\n");
if (unlikely(rlen - sizeof(*hdr) <
sizeof(struct username_struct)))
goto close;
err = try_register_user_by_sockaddr(ws->c,
buff + sizeof(struct ct_proto),
rlen - sizeof(struct ct_proto),
&naddr, nlen, auth_log);
if (unlikely(err))
goto close;
goto next;
}
err = get_user_by_sockaddr(&naddr, nlen, &p);
if (unlikely(err || !p))
goto close;
clen = curve25519_decode(ws->c, p, (unsigned char *) buff +
sizeof(struct ct_proto),
rlen - sizeof(struct ct_proto),
(unsigned char **) &cbuff, NULL);
if (unlikely(clen <= 0))
goto close;
cbuff += crypto_box_zerobytes;
clen -= crypto_box_zerobytes;
err = trie_addr_maybe_update(cbuff, clen, ws->parent.ipv4,
fd, &naddr, nlen);
if (unlikely(err))
goto next;
err = write(ws->parent.tunfd, cbuff, clen);
next:
nlen = sizeof(naddr);
memset(&naddr, 0, sizeof(naddr));
}
return keep;
}
static int handler_udp(int fd, const struct worker_struct *ws,
char *buff, size_t len)
{
int ret = 0;
if (fd == ws->parent.tunfd)
ret = handler_udp_tun_to_net(fd, ws, buff, len);
else
ret = handler_udp_net_to_tun(fd, ws, buff, len);
return ret;
}
static int handler_tcp_tun_to_net(int fd, const struct worker_struct *ws,
char *buff, size_t len)
{
int dfd, keep = 1;
char *cbuff;
ssize_t rlen, err, clen;
struct ct_proto *hdr;
struct curve25519_proto *p;
socklen_t nlen;
size_t off = sizeof(struct ct_proto) + crypto_box_zerobytes;
if (!buff || len <= off)
return 0;
memset(buff, 0, len);
while ((rlen = read(fd, buff + off, len - off)) > 0) {
dfd = -1; p = NULL;
hdr = (struct ct_proto *) buff;
memset(hdr, 0, sizeof(*hdr));
hdr->flags = 0;
trie_addr_lookup(buff + off, rlen, ws->parent.ipv4, &dfd, NULL,
(size_t *) &nlen);
if (unlikely(dfd < 0)) {
memset(buff, 0, len);
continue;
}
err = get_user_by_socket(dfd, &p);
if (unlikely(err || !p)) {
memset(buff, 0, len);
continue;
}
clen = curve25519_encode(ws->c, p, (unsigned char *) (buff + off -
crypto_box_zerobytes), (rlen +
crypto_box_zerobytes), (unsigned char **)
&cbuff);
if (unlikely(clen <= 0)) {
memset(buff, 0, len);
continue;
}
hdr->payload = htons((uint16_t) clen);
set_tcp_cork(dfd);
write_exact(dfd, hdr, sizeof(struct ct_proto), 0);
write_exact(dfd, cbuff, clen, 0);
set_tcp_uncork(dfd);
memset(buff, 0, len);
}
return keep;
}
ssize_t handler_tcp_read(int fd, char *buff, size_t len)
{
ssize_t rlen;
struct ct_proto *hdr = (struct ct_proto *) buff;
if (!buff || !len)
return 0;
/* May exit on EAGAIN if 0 Byte read */
rlen = read_exact(fd, buff, sizeof(struct ct_proto), 1);
if (rlen < 0)
return rlen;
if (unlikely(ntohs(hdr->payload) > len - sizeof(struct ct_proto))) {
errno = ENOMEM;
return 1; /* Force server to close connection */
}
/* May not exit on EAGAIN if 0 Byte read */
rlen = read_exact(fd, buff + sizeof(struct ct_proto),
ntohs(hdr->payload), 0);
if (rlen < 0)
return rlen;
return sizeof(struct ct_proto) + rlen;
}
static void handler_tcp_notify_close(int fd)
{
struct ct_proto hdr;
memset(&hdr, 0, sizeof(hdr));
hdr.flags |= PROTO_FLAG_EXIT;
hdr.payload = 0;
if (write(fd, &hdr, sizeof(hdr))) { ; }
}
static int handler_tcp_net_to_tun(int fd, const struct worker_struct *ws,
char *buff, size_t len)
{
int keep = 1, count = 0;
char *cbuff;
ssize_t rlen, err, clen;
struct ct_proto *hdr;
struct curve25519_proto *p;
if (!buff || !len)
return 0;
while ((rlen = handler_tcp_read(fd, buff, len)) > 0) {
p = NULL;
hdr = (struct ct_proto *) buff;
if (unlikely(rlen < sizeof(struct ct_proto)))
goto close;
if (unlikely(rlen - sizeof(*hdr) != ntohs(hdr->payload)))
goto close;
if (unlikely(ntohs(hdr->payload) == 0))
goto close;
if (hdr->flags & PROTO_FLAG_EXIT) {
close:
remove_user_by_socket(fd);
trie_addr_remove(fd);
handler_tcp_notify_close(fd);
rlen = write(ws->parent.efd, &fd, sizeof(fd));
keep = 0;
return keep;
}
if (hdr->flags & PROTO_FLAG_INIT) {
syslog_maybe(auth_log, LOG_INFO, "Got initial userhash "
"from remote end!\n");
if (unlikely(rlen - sizeof(*hdr) <
sizeof(struct username_struct)))
goto close;
err = try_register_user_by_socket(ws->c,
buff + sizeof(struct ct_proto),
rlen - sizeof(struct ct_proto),
fd, auth_log);
if (unlikely(err))
goto close;
continue;
}
err = get_user_by_socket(fd, &p);
if (unlikely(err || !p))
continue;
clen = curve25519_decode(ws->c, p, (unsigned char *) buff +
sizeof(struct ct_proto),
rlen - sizeof(struct ct_proto),
(unsigned char **) &cbuff, NULL);
if (unlikely(clen <= 0))
continue;
cbuff += crypto_box_zerobytes;
clen -= crypto_box_zerobytes;
err = trie_addr_maybe_update(cbuff, clen, ws->parent.ipv4,
fd, NULL, 0);
if (unlikely(err))
continue;
err = write(ws->parent.tunfd, cbuff, clen);
count++;
if (count == 10) {
write_exact(ws->efd[1], &fd, sizeof(fd), 1);
/* Read later next data and let others process */
return keep;
}
}
return keep;
}
static int handler_tcp(int fd, const struct worker_struct *ws,
char *buff, size_t len)
{
int ret = 0;
if (fd == ws->parent.tunfd)
ret = handler_tcp_tun_to_net(fd, ws, buff, len);
else
ret = handler_tcp_net_to_tun(fd, ws, buff, len);
return ret;
}
static void *worker(void *self)
{
int fd, old_state;
ssize_t ret;
size_t blen = TUNBUFF_SIZ; //FIXME
struct worker_struct *ws = self;
struct pollfd fds;
char *buff;
fds.fd = ws->efd[0];
fds.events = POLLIN;
ws->c = curve25519_tfm_alloc();
buff = xmalloc_aligned(blen, 64);
syslog(LOG_INFO, "curvetun thread on CPU%u up!\n", ws->cpu);
pthread_cleanup_push(curve25519_tfm_free_void, ws->c);
pthread_cleanup_push(xfree_func, buff);
while (likely(!sigint)) {
poll(&fds, 1, -1);
if ((fds.revents & POLLIN) != POLLIN)
continue;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_state);
while ((ret = read_exact(ws->efd[0], &fd, sizeof(fd), 1)) > 0) {
if (ret != sizeof(fd)) {
sched_yield();
continue;
}
ret = ws->handler(fd, ws, buff, blen);
if (ret)
write_exact(ws->parent.refd, &fd, sizeof(fd), 1);
}
pthread_setcancelstate(old_state, NULL);
}
syslog(LOG_INFO, "curvetun thread on CPU%u down!\n", ws->cpu);
pthread_cleanup_pop(1);
pthread_cleanup_pop(1);
pthread_exit((void *) ((long) ws->cpu));
}
static void thread_spawn_or_panic(unsigned int cpus, int efd, int refd,
int tunfd, int ipv4, int udp)
{
int i, ret;
cpu_set_t cpuset;
unsigned int threads;
threads = cpus * THREADS_PER_CPU;
for (i = 0; i < threads; ++i) {
CPU_ZERO(&cpuset);
threadpool[i].cpu = i % cpus;
CPU_SET(threadpool[i].cpu, &cpuset);
ret = pipe2(threadpool[i].efd, O_NONBLOCK);
if (ret < 0)
syslog_panic("Cannot create event socket!\n");
threadpool[i].c = xmalloc_aligned(sizeof(*threadpool[i].c), 64);
threadpool[i].parent.efd = efd;
threadpool[i].parent.refd = refd;
threadpool[i].parent.tunfd = tunfd;
threadpool[i].parent.ipv4 = ipv4;
threadpool[i].parent.udp = udp;
threadpool[i].handler = udp ? handler_udp : handler_tcp;
ret = pthread_create(&threadpool[i].trid, NULL,
worker, &threadpool[i]);
if (ret < 0)
syslog_panic("Thread creation failed!\n");
ret = pthread_setaffinity_np(threadpool[i].trid,
sizeof(cpuset), &cpuset);
if (ret < 0)
syslog_panic("Thread CPU migration failed!\n");
pthread_detach(threadpool[i].trid);
}
sleep(1);
}
static void thread_finish(unsigned int cpus)
{
int i;
unsigned int threads;
threads = cpus * THREADS_PER_CPU;
for (i = 0; i < threads; ++i) {
while (pthread_join(threadpool[i].trid, NULL) < 0)
;
close(threadpool[i].efd[0]);
close(threadpool[i].efd[1]);
}
}
int server_main(char *home, char *dev, char *port, int udp, int ipv4, int log)
{
int lfd = -1, kdpfd, nfds, nfd, curfds, efd[2], refd[2], tunfd, i;
unsigned int cpus = 0, threads, udp_cpu = 0;
ssize_t ret;
struct epoll_event *events;
struct addrinfo hints, *ahead, *ai;
auth_log = !!log;
openlog("curvetun", LOG_PID | LOG_CONS | LOG_NDELAY, LOG_DAEMON);
syslog(LOG_INFO, "curvetun server booting!\n");
syslog_maybe(!auth_log, LOG_INFO, "curvetun user logging disabled!\n");
parse_userfile_and_generate_user_store_or_die(home);
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = udp ? SOCK_DGRAM : SOCK_STREAM;
hints.ai_protocol = udp ? IPPROTO_UDP : IPPROTO_TCP;
hints.ai_flags = AI_PASSIVE;
ret = getaddrinfo(NULL, port, &hints, &ahead);
if (ret < 0)
syslog_panic("Cannot get address info!\n");
for (ai = ahead; ai != NULL && lfd < 0; ai = ai->ai_next) {
lfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (lfd < 0)
continue;
if (ai->ai_family == AF_INET6) {
#ifdef IPV6_V6ONLY
ret = set_ipv6_only(lfd);
if (ret < 0) {
close(lfd);
lfd = -1;
continue;
}
#else
close(lfd);
lfd = -1;
continue;
#endif /* IPV6_V6ONLY */
}
set_reuseaddr(lfd);
set_mtu_disc_dont(lfd);
ret = bind(lfd, ai->ai_addr, ai->ai_addrlen);
if (ret < 0) {
close(lfd);
lfd = -1;
continue;
}
if (!udp) {
ret = listen(lfd, 5);
if (ret < 0) {
close(lfd);
lfd = -1;
continue;
}
}
if (ipv4 == -1) {
ipv4 = (ai->ai_family == AF_INET6 ? 0 :
(ai->ai_family == AF_INET ? 1 : -1));
}
syslog_maybe(auth_log, LOG_INFO, "curvetun on IPv%d via %s "
"on port %s!\n", ai->ai_family == AF_INET ? 4 : 6,
udp ? "UDP" : "TCP", port);
syslog_maybe(auth_log, LOG_INFO, "Allowed overlay proto is "
"IPv%d!\n", ipv4 ? 4 : 6);
}
freeaddrinfo(ahead);
if (lfd < 0 || ipv4 < 0)
syslog_panic("Cannot create socket!\n");
tunfd = tun_open_or_die(dev ? dev : DEVNAME_SERVER, IFF_TUN | IFF_NO_PI);
pipe_or_die(efd, O_NONBLOCK);
pipe_or_die(refd, O_NONBLOCK);
set_nonblocking(lfd);
events = xcalloc(MAX_EPOLL_SIZE, sizeof(*events));
for (i = 0; i < MAX_EPOLL_SIZE; ++i)
events[i].data.fd = -1;
kdpfd = epoll_create(MAX_EPOLL_SIZE);
if (kdpfd < 0)
syslog_panic("Cannot create socket!\n");
set_epoll_descriptor(kdpfd, EPOLL_CTL_ADD, lfd,
udp ? EPOLLIN | EPOLLET | EPOLLONESHOT : EPOLLIN);
set_epoll_descriptor(kdpfd, EPOLL_CTL_ADD, efd[0], EPOLLIN);
set_epoll_descriptor(kdpfd, EPOLL_CTL_ADD, refd[0], EPOLLIN);
set_epoll_descriptor(kdpfd, EPOLL_CTL_ADD, tunfd,
EPOLLIN | EPOLLET | EPOLLONESHOT);
curfds = 4;
trie_init();
cpus = get_number_cpus_online();
threads = cpus * THREADS_PER_CPU;
if (!ispow2(threads))
syslog_panic("Thread number not power of two!\n");
threadpool = xcalloc(threads, sizeof(*threadpool));
thread_spawn_or_panic(cpus, efd[1], refd[1], tunfd, ipv4, udp);
init_cpusched(threads);
register_socket(tunfd);
register_socket(lfd);
syslog(LOG_INFO, "curvetun up and running!\n");
while (likely(!sigint)) {
nfds = epoll_wait(kdpfd, events, curfds, -1);
if (nfds < 0) {
syslog(LOG_ERR, "epoll_wait error: %s\n",
strerror(errno));
break;
}
for (i = 0; i < nfds; ++i) {
if (unlikely(events[i].data.fd < 0))
continue;
if (events[i].data.fd == lfd && !udp) {
int ncpu;
char hbuff[256], sbuff[256];
struct sockaddr_storage taddr;
socklen_t tlen;
tlen = sizeof(taddr);
nfd = accept(lfd, (struct sockaddr *) &taddr,
&tlen);
if (nfd < 0) {
syslog(LOG_ERR, "accept error: %s\n",
strerror(errno));
continue;
}
if (curfds + 1 > MAX_EPOLL_SIZE) {
close(nfd);
continue;
}
curfds++;
ncpu = register_socket(nfd);
memset(hbuff, 0, sizeof(hbuff));
memset(sbuff, 0, sizeof(sbuff));
getnameinfo((struct sockaddr *) &taddr, tlen,
hbuff, sizeof(hbuff),
sbuff, sizeof(sbuff),
NI_NUMERICHOST | NI_NUMERICSERV);
syslog_maybe(auth_log, LOG_INFO, "New connection "
"from %s:%s (%d active client connections) - id %d on CPU%d",
hbuff, sbuff, curfds-4, nfd, ncpu);
set_nonblocking(nfd);
set_socket_keepalive(nfd);
set_tcp_nodelay(nfd);
ret = set_epoll_descriptor2(kdpfd, EPOLL_CTL_ADD,
nfd, EPOLLIN | EPOLLET | EPOLLONESHOT);
if (ret < 0) {
close(nfd);
curfds--;
continue;
}
} else if (events[i].data.fd == refd[0]) {
int fd_one;
ret = read_exact(refd[0], &fd_one,
sizeof(fd_one), 1);
if (ret != sizeof(fd_one) || fd_one <= 0)
continue;
ret = set_epoll_descriptor2(kdpfd, EPOLL_CTL_MOD,
fd_one, EPOLLIN | EPOLLET | EPOLLONESHOT);
if (ret < 0) {
close(fd_one);
continue;
}
} else if (events[i].data.fd == efd[0]) {
int fd_del, test;
ret = read_exact(efd[0], &fd_del,
sizeof(fd_del), 1);
if (ret != sizeof(fd_del) || fd_del <= 0)
continue;
ret = read(fd_del, &test, sizeof(test));
if (ret < 0 && errno == EBADF)
continue;
ret = set_epoll_descriptor2(kdpfd, EPOLL_CTL_DEL,
fd_del, 0);
if (ret < 0) {
close(fd_del);
continue;
}
close(fd_del);
curfds--;
unregister_socket(fd_del);
syslog_maybe(auth_log, LOG_INFO, "Closed connection "
"with id %d (%d active client connections remain)\n", fd_del,
curfds-4);
} else {
int cpu, fd_work = events[i].data.fd;
if (!udp)
cpu = socket_to_cpu(fd_work);
else
udp_cpu = (udp_cpu + 1) & (threads - 1);
write_exact(threadpool[udp ? udp_cpu : cpu].efd[1],
&fd_work, sizeof(fd_work), 1);
}
}
}
syslog(LOG_INFO, "curvetun prepare shut down!\n");
close(lfd);
close(efd[0]);
close(efd[1]);
close(refd[0]);
close(refd[1]);
close(tunfd);
thread_finish(cpus);
xfree(threadpool);
xfree(events);
unregister_socket(lfd);
unregister_socket(tunfd);
destroy_cpusched();
trie_cleanup();
destroy_user_store();
syslog(LOG_INFO, "curvetun shut down!\n");
closelog();
return 0;
}