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stud.c
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stud.c
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/**
GNvltL8Zv9 * Copyright 2011 Bump Technologies, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY BUMP TECHNOLOGIES, INC. ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BUMP TECHNOLOGIES, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of Bump Technologies, Inc.
*
**/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netdb.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <getopt.h>
#include <pwd.h>
#include <limits.h>
#include <syslog.h>
#include <stdarg.h>
#include <ctype.h>
#include <sched.h>
#include <signal.h>
#include <openssl/x509.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/engine.h>
#include <ev.h>
#include "ringbuffer.h"
#include "shctx.h"
#include "configuration.h"
#ifndef MSG_NOSIGNAL
# define MSG_NOSIGNAL 0
#endif
#ifndef AI_ADDRCONFIG
# define AI_ADDRCONFIG 0
#endif
/* For Mac OS X */
#ifndef TCP_KEEPIDLE
# ifdef TCP_KEEPALIVE
# define TCP_KEEPIDLE TCP_KEEPALIVE
# endif
#endif
#ifndef SOL_TCP
# define SOL_TCP IPPROTO_TCP
#endif
/* Globals */
static struct ev_loop *loop;
static struct stud_config_addr* backaddr;
static pid_t master_pid;
static ev_io listener;
static int listener_socket;
static int child_num;
static pid_t *child_pids;
static SSL_CTX *ssl_ctx_sha2;
static SSL_CTX *ssl_ctx;
static SSL_SESSION *client_session;
static unsigned char ssl_session_id_context[4] = "\xde\xca\xfa\xce";
#define LOG_REOPEN_INTERVAL 60
static FILE* logf;
static struct stat logf_st;
static time_t logf_check_t;
#ifdef USE_SHARED_CACHE
static ev_io shcupd_listener;
static int shcupd_socket;
struct addrinfo *shcupd_peers[MAX_SHCUPD_PEERS+1];
static unsigned char shared_secret[SHA_DIGEST_LENGTH];
//typedef struct shcupd_peer_opt {
// const char *ip;
// const char *port;
//} shcupd_peer_opt;
#endif /*USE_SHARED_CACHE*/
long openssl_version;
int create_workers;
stud_config *CONFIG;
static char tcp_proxy_line[128] = "";
/* What agent/state requests the shutdown--for proper half-closed
* handling */
typedef enum _SHUTDOWN_REQUESTOR {
SHUTDOWN_CLEAR,
SHUTDOWN_SSL,
SHUTDOWN_HANDSHAKE_TIMEOUT,
SHUTDOWN_SOCKERR,
SHUTDOWN_SSLERR,
SHUTDOWN_CONNECT
} SHUTDOWN_REQUESTOR;
/*
* Proxied State
*
* All state associated with one proxied connection
*/
typedef struct proxystate {
ringbuffer ring_ssl2clear; /* pushing bytes from secure to clear stream */
ringbuffer ring_clear2ssl; /* pushing bytes from clear to secure stream */
char buf1_ssl[128];
char buf1_clear[128];
int buf1_ssl_len;
int buf1_clear_len;
int proxy_clear_len;
uint64_t t_start;
int ssl_info_where;
int ssl_info_ret;
char ssl_info_state[128];
int socket_err;
ev_io ev_r_ssl; /* secure stream write event */
ev_io ev_w_ssl; /* secure stream read event */
ev_io ev_r_handshake; /* secure stream handshake write event */
ev_io ev_w_handshake; /* secure stream handshake read event */
ev_timer ev_t_handshake; /* handshake timer */
ev_io ev_w_connect; /* backend connect event */
ev_timer ev_t_connect; /* backend connect timer */
ev_io ev_r_clear; /* clear stream write event */
ev_io ev_w_clear; /* clear stream read event */
int fd_up; /* Upstream (client) socket */
int fd_down; /* Downstream (backend) socket */
struct stud_config_addr* addr_down;
int want_shutdown:1; /* Connection is half-shutdown */
int handshaked:1; /* Initial handshake happened */
int clear_connected:1; /* clear stream is connected */
int renegotiation:1; /* Renegotation is occuring */
int want_sha2:1; /* client wants a sha2 cert */
SSL *ssl; /* OpenSSL SSL state */
struct sockaddr_storage remote_ip; /* Remote ip returned from `accept` */
int connect_port; /* local port for connection */
} proxystate;
static void handle_connect(struct ev_loop *loop, ev_io *w, int revents);
static void connect_timeout(EV_P_ ev_timer *w, int revents);
static void start_handshake(proxystate *ps, int err);
static void client_handshake(struct ev_loop *loop, ev_io *w, int revents);
static void handshake_timeout(EV_P_ ev_timer *w, int revents);
static void ssl_write(struct ev_loop *loop, ev_io *w, int revents);
static void ssl_read(struct ev_loop *loop, ev_io *w, int revents);
static void VWLOG (int level, const char* fmt, va_list ap)
{
if (logf) {
struct timeval tv;
struct tm tm;
char buf[1024];
int n;
va_list ap1;
gettimeofday(&tv,NULL);
if (logf != stdout && logf != stderr && tv.tv_sec >= logf_check_t+LOG_REOPEN_INTERVAL) {
struct stat st;
if (stat(CONFIG->LOG_FILENAME, &st) < 0
|| st.st_dev != logf_st.st_dev
|| st.st_ino != logf_st.st_ino)
{
fclose(logf);
if ((logf = fopen(CONFIG->LOG_FILENAME, "a")) != NULL) {
fstat(fileno(logf), &logf_st);
setbuf(logf, NULL);
} else {
memset(&logf_st, 0, sizeof(logf_st));
}
}
logf_check_t = tv.tv_sec;
}
localtime_r(&tv.tv_sec, &tm);
n = strftime(buf, sizeof(buf), "%Y%m%dT%H%M%S", &tm);
sprintf(buf+n, ".%06d [%5d] %s", (int)tv.tv_usec, getpid(), fmt);
va_copy(ap1, ap);
vfprintf(logf, buf, ap1);
}
if (CONFIG->SYSLOG) {
vsyslog(level, fmt, ap);
}
}
static void WLOG (int level, const char* fmt, ...)
{
va_list ap;
va_start(ap, fmt);
VWLOG(level, fmt, ap);
va_end(ap);
}
#define LOG(...) if (!CONFIG->QUIET) WLOG(LOG_INFO, __VA_ARGS__ )
#define ERR(...) WLOG(LOG_ERR, __VA_ARGS__ )
#define SOCKERR(msg) \
if (errno == ECONNRESET) {\
LOG(msg ": %s\n", strerror(errno)); \
} else {\
ERR(msg ": %s\n", strerror(errno)); \
}
static uint64_t get_usec () {
struct timeval t;
gettimeofday(&t, NULL);
return (uint64_t)t.tv_sec * 1000000 + t.tv_usec;
}
static void
logproxy (int level, const proxystate* ps, const char* fmt, ...)
{
char buf[1024];
char abuf[INET_ADDRSTRLEN+1];
int bytes_up = -1;
int bytes_down = -1;
va_list ap;
char sslbuf[33], clearbuf[33];
int i, j;
ioctl(ps->fd_up, FIONWRITE, &bytes_up);
ioctl(ps->fd_down, FIONWRITE, &bytes_down);
for (i = 0, j = 0; i < ps->buf1_ssl_len && j < (int)sizeof(sslbuf)-2; ++i) {
char c = ps->buf1_ssl[i];
if (c == '\r') {
break;
}
sslbuf[j++] = c;
if (c == '%') {
sslbuf[j++] = c;
}
}
sslbuf[j] = 0;
for (i = 0, j = 0; i < ps->buf1_clear_len && j < (int)sizeof(clearbuf)-2; ++i) {
char c = ps->buf1_clear[i];
if (c == '\r') {
break;
}
clearbuf[j++] = c;
if (c == '%') {
clearbuf[j++] = c;
}
}
clearbuf[j] = 0;
va_start(ap, fmt);
snprintf(buf, sizeof(buf), "%s:%d :%d cfd=%d sfd=%d cbytes=%d/%d/%d sbytes=%d/%d/%d ssl=%s sockerr=%d t=%llu [%s] [%s]: %s",
inet_ntop(AF_INET, &((struct sockaddr_in*)&ps->remote_ip)->sin_addr, abuf, sizeof(abuf)),
ntohs(((struct sockaddr_in*)&ps->remote_ip)->sin_port),
ps->connect_port,
ps->fd_up, ps->fd_down,
ringbuffer_bytes_written(&ps->ring_ssl2clear) - ps->proxy_clear_len,
ringbuffer_bytes_pending(&ps->ring_ssl2clear),
bytes_up,
ringbuffer_bytes_written(&ps->ring_clear2ssl),
ringbuffer_bytes_pending(&ps->ring_clear2ssl),
bytes_down,
ps->ssl_info_state,
ps->socket_err,
(unsigned long long)(get_usec() - ps->t_start),
sslbuf,
clearbuf,
fmt);
VWLOG(level, buf, ap);
}
#define VERBOSEPROXY(...) \
if (!CONFIG->QUIET && CONFIG->VERBOSE && (logf || CONFIG->SYSLOG)) logproxy(LOG_INFO, __VA_ARGS__ )
#define ERRPROXY(...) \
if (logf || CONFIG->SYSLOG) logproxy(LOG_ERR, __VA_ARGS__ )
#define LOGPROXY(...) \
if (!CONFIG->QUIET && (logf || CONFIG->SYSLOG)) logproxy(LOG_ERR, __VA_ARGS__ )
#define NULL_DEV "/dev/null"
/* set a file descriptor (socket) to non-blocking mode */
static void setnonblocking(int fd) {
int flag = 1;
if (ioctl(fd, FIONBIO, &flag) < 0) {
SOCKERR("Error setting FIONBIO");
}
}
/* set a tcp socket to use TCP Keepalive */
static void settcpkeepalive(int fd) {
int optval = 1;
socklen_t optlen = sizeof(optval);
if(setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &optval, optlen) < 0) {
SOCKERR("Error activating SO_KEEPALIVE on client socket");
}
optval = CONFIG->TCP_KEEPALIVE_TIME;
optlen = sizeof(optval);
#ifdef TCP_KEEPIDLE
if(setsockopt(fd, SOL_TCP, TCP_KEEPIDLE, &optval, optlen) < 0) {
SOCKERR("Error setting TCP_KEEPIDLE on client socket");
}
#endif
}
static void fail(const char* s) {
ERR("%s: %s\n", s, strerror(errno));
exit(1);
}
void die (char *fmt, ...) {
va_list args;
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
exit(1);
}
#ifndef OPENSSL_NO_DH
static int init_dh(SSL_CTX *ctx, const char *cert) {
DH *dh;
BIO *bio;
assert(cert);
bio = BIO_new_file(cert, "r");
if (!bio) {
ERR_print_errors_fp(stderr);
return -1;
}
dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
BIO_free(bio);
if (!dh) {
ERR("{core} Note: no DH parameters found in %s\n", cert);
return -1;
}
LOG("{core} Using DH parameters from %s\n", cert);
SSL_CTX_set_tmp_dh(ctx, dh);
LOG("{core} DH initialized with %d bit key\n", 8*DH_size(dh));
DH_free(dh);
#ifndef OPENSSL_NO_EC
#ifdef NID_X9_62_prime256v1
EC_KEY *ecdh = NULL;
ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
SSL_CTX_set_tmp_ecdh(ctx,ecdh);
EC_KEY_free(ecdh);
SSL_CTX_set_options(ctx, SSL_OP_SINGLE_ECDH_USE);
LOG("{core} ECDH Initialized with NIST P-256\n");
#endif /* NID_X9_62_prime256v1 */
#endif /* OPENSSL_NO_EC */
return 0;
}
#endif /* OPENSSL_NO_DH */
/* This callback function is executed while OpenSSL processes the SSL
* handshake and does SSL record layer stuff. It's used to trap
* client-initiated renegotiations.
*/
static void info_callback(const SSL *ssl, int where, int ret) {
proxystate *ps = (proxystate *)SSL_get_app_data(ssl);
ps->ssl_info_where = where;
ps->ssl_info_ret = ret;
strlcpy(ps->ssl_info_state, SSL_state_string_long(ssl), sizeof(ps->ssl_info_state));
if (where & SSL_CB_HANDSHAKE_START) {
if (ps->handshaked) {
ps->renegotiation = 1;
LOG("{core} SSL renegotiation asked by client\n");
}
}
}
/* Unfortunately, there is no hook for the singature algorithm callback
* and the minimal processing done by the library is encapsulated away
* where it can't be found.
* So, we duplicate processing. :(
* Data is two-bytes length (bytes), then hash, signature pairs
* we only care about SHA256_RSA, because that's our non-default
*/
void tlsext_debug_callback(SSL *ssl, int client_server, int type, unsigned char *data, int len, void *arg)
{
(void) client_server;
(void) arg;
if (type == TLSEXT_TYPE_signature_algorithms) {
/* require even length data */
if (len > 2 && (len & 1) == 0) {
int dsize = (data[0] << 8) | data[1];
if (dsize == len - 2) {
int i;
for (i = 2; i < len; i+=2) {
unsigned char hash_alg = data[i], sig_alg = data[i+1];
if (sig_alg == TLSEXT_signature_rsa && hash_alg == TLSEXT_hash_sha256) {
proxystate *ps = (proxystate *)SSL_get_app_data(ssl);
ps->want_sha2 = 1;
}
}
}
}
}
}
/* This callback function is executed after all extensions have been processed and
* before OpenSSL sends the SSL certificate. Use to send SHA-2 cert to compliant clients
*/
int servername_callback(SSL *ssl, int *al, void *data) {
(void) data;
(void) al;
proxystate *ps = (proxystate *)SSL_get_app_data(ssl);
if (ps->want_sha2) {
SSL_set_SSL_CTX(ssl, ssl_ctx_sha2);
}
return SSL_TLSEXT_ERR_NOACK; // NOACK because we didn't actually use the servername info
}
/* ALPN callback, always negotiate to HTTP/1.1; could be configurable if we care later
* negotiating ALPN enables TLS false start with many clients, so we'll get their request
* one round trip sooner
*/
int alpn_callback(SSL *ssl, const unsigned char **out, unsigned char *outlen,
const unsigned char *in, unsigned int inlen, void *arg) {
int selected;
(void) arg;
(void) ssl;
static unsigned char alpn[] = { 8, 'h', 't', 't', 'p', '/', '1', '.', '1'};
unsigned int length = sizeof(alpn);
selected = SSL_select_next_proto((unsigned char **)out, outlen, alpn, length, in, inlen);
if (selected == OPENSSL_NPN_NEGOTIATED) {
return SSL_TLSEXT_ERR_OK;
}
return SSL_TLSEXT_ERR_NOACK;
}
#ifdef USE_SHARED_CACHE
/* Handle incoming message updates */
static void handle_shcupd(struct ev_loop *loop, ev_io *w, int revents) {
(void) revents;
unsigned char msg[SHSESS_MAX_ENCODED_LEN], hash[EVP_MAX_MD_SIZE];
ssize_t r;
unsigned int hash_len;
uint32_t encdate;
long now = (time_t)ev_now(loop);
while ( ( r = recv(w->fd, msg, sizeof(msg), 0) ) > 0 ) {
/* msg len must be greater than 1 Byte of data + sig length */
if (r < (int)(1+sizeof(shared_secret)))
continue;
/* compute sig */
r -= sizeof(shared_secret);
HMAC(EVP_sha1(), shared_secret, sizeof(shared_secret), msg, r, hash, &hash_len);
if (hash_len != sizeof(shared_secret)) /* should never append */
continue;
/* check sign */
if(memcmp(msg+r, hash, hash_len))
continue;
/* msg len must be greater than 1 Byte of data + encdate length */
if (r < (int)(1+sizeof(uint32_t)))
continue;
/* drop too unsync updates */
r -= sizeof(uint32_t);
encdate = *((uint32_t *)&msg[r]);
if (!(abs((int)(int32_t)now-ntohl(encdate)) < SSL_CTX_get_timeout(ssl_ctx)))
continue;
shctx_sess_add(msg, r, now);
}
}
/* Send remote updates messages callback */
void shcupd_session_new(unsigned char *msg, unsigned int len, long cdate) {
unsigned int hash_len;
struct addrinfo **pai = shcupd_peers;
uint32_t ncdate;
/* add session creation encoded date to footer */
ncdate = htonl((uint32_t)cdate);
memcpy(msg+len, &ncdate, sizeof(ncdate));
len += sizeof(ncdate);
/* add msg sign */
HMAC(EVP_sha1(), shared_secret, sizeof(shared_secret),
msg, len, msg+len, &hash_len);
len += hash_len;
/* send msg to peers */
while (*pai) {
sendto(shcupd_socket, msg, len, 0, (*pai)->ai_addr, (*pai)->ai_addrlen);
pai++;
}
}
/* Compute a sha1 secret from an ASN1 rsa private key */
static int compute_secret(RSA *rsa, unsigned char *secret) {
unsigned char *buf,*p;
unsigned int length;
length = i2d_RSAPrivateKey(rsa, NULL);
if (length <= 0)
return -1;
p = buf = (unsigned char *)malloc(length*sizeof(unsigned char));
if (!buf)
return -1;
i2d_RSAPrivateKey(rsa,&p);
SHA1(buf, length, secret);
free(buf);
return 0;
}
/* Create udp socket to receive and send updates */
static int create_shcupd_socket() {
struct addrinfo *ai, hints;
struct addrinfo **pai = shcupd_peers;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
const int gai_err = getaddrinfo(CONFIG->SHCUPD_IP, CONFIG->SHCUPD_PORT,
&hints, &ai);
if (gai_err != 0) {
ERR("{getaddrinfo}: [%s]\n", gai_strerror(gai_err));
exit(1);
}
/* check if peers inet family addresses match */
while (*pai) {
if ((*pai)->ai_family != ai->ai_family) {
ERR("Share host and peers inet family differs\n");
exit(1);
}
pai++;
}
int s = socket(ai->ai_family, SOCK_DGRAM, IPPROTO_UDP);
if (s == -1)
fail("{socket: shared cache updates}");
int t = 1;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &t, sizeof(int));
#ifdef SO_REUSEPORT
setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &t, sizeof(int));
#endif
setnonblocking(s);
if (ai->ai_addr->sa_family == AF_INET) {
struct ip_mreqn mreqn;
memset(&mreqn, 0, sizeof(mreqn));
mreqn.imr_multiaddr.s_addr = ((struct sockaddr_in *)ai->ai_addr)->sin_addr.s_addr;
if (CONFIG->SHCUPD_MCASTIF) {
if (isalpha(*CONFIG->SHCUPD_MCASTIF)) { /* appears to be an iface name */
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
if (strlen(CONFIG->SHCUPD_MCASTIF) > IFNAMSIZ) {
ERR("Error iface name is too long [%s]\n",CONFIG->SHCUPD_MCASTIF);
exit(1);
}
memcpy(ifr.ifr_name, CONFIG->SHCUPD_MCASTIF, strlen(CONFIG->SHCUPD_MCASTIF));
if (ioctl(s, SIOCGIFINDEX, &ifr)) {
fail("{ioctl: SIOCGIFINDEX}");
}
mreqn.imr_ifindex = ifr.ifr_ifindex;
}
else if (strchr(CONFIG->SHCUPD_MCASTIF,'.')) { /* appears to be an ipv4 address */
mreqn.imr_address.s_addr = inet_addr(CONFIG->SHCUPD_MCASTIF);
}
else { /* appears to be an iface index */
mreqn.imr_ifindex = atoi(CONFIG->SHCUPD_MCASTIF);
}
}
if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreqn, sizeof(mreqn)) < 0) {
if (errno != EINVAL) { /* EINVAL if it is not a multicast address,
not an error we consider unicast */
fail("{setsockopt: IP_ADD_MEMBERSIP}");
}
}
else { /* this is a multicast address */
unsigned char loop = 0;
if(setsockopt(s, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)) < 0) {
fail("{setsockopt: IP_MULTICAST_LOOP}");
}
}
/* optional set sockopts for sending to multicast msg */
if (CONFIG->SHCUPD_MCASTIF &&
setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, &mreqn, sizeof(mreqn)) < 0) {
fail("{setsockopt: IP_MULTICAST_IF}");
}
if (CONFIG->SHCUPD_MCASTTTL) {
unsigned char ttl;
ttl = (unsigned char)atoi(CONFIG->SHCUPD_MCASTTTL);
if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0) {
fail("{setsockopt: IP_MULTICAST_TTL}");
}
}
}
#ifdef IPV6_ADD_MEMBERSHIP
else if (ai->ai_addr->sa_family == AF_INET6) {
struct ipv6_mreq mreq;
memset(&mreq, 0, sizeof(mreq));
memcpy(&mreq.ipv6mr_multiaddr, &((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr,
sizeof(mreq.ipv6mr_multiaddr));
if (CONFIG->SHCUPD_MCASTIF) {
if (isalpha(*CONFIG->SHCUPD_MCASTIF)) { /* appears to be an iface name */
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
if (strlen(CONFIG->SHCUPD_MCASTIF) > IFNAMSIZ) {
ERR("Error iface name is too long [%s]\n",CONFIG->SHCUPD_MCASTIF);
exit(1);
}
memcpy(ifr.ifr_name, CONFIG->SHCUPD_MCASTIF, strlen(CONFIG->SHCUPD_MCASTIF));
if (ioctl(s, SIOCGIFINDEX, &ifr)) {
fail("{ioctl: SIOCGIFINDEX}");
}
mreq.ipv6mr_interface = ifr.ifr_ifindex;
}
else { /* option appears to be an iface index */
mreq.ipv6mr_interface = atoi(CONFIG->SHCUPD_MCASTIF);
}
}
if (setsockopt(s, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
if (errno != EINVAL) { /* EINVAL if it is not a multicast address,
not an error we consider unicast */
fail("{setsockopt: IPV6_ADD_MEMBERSIP}");
}
}
else { /* this is a multicast address */
unsigned int loop = 0;
if(setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &loop, sizeof(loop)) < 0) {
fail("{setsockopt: IPV6_MULTICAST_LOOP}");
}
}
/* optional set sockopts for sending to multicast msg */
if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_IF,
&mreq.ipv6mr_interface, sizeof(mreq.ipv6mr_interface)) < 0) {
fail("{setsockopt: IPV6_MULTICAST_IF}");
}
if (CONFIG->SHCUPD_MCASTTTL) {
int hops;
hops = atoi(CONFIG->SHCUPD_MCASTTTL);
if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hops, sizeof(hops)) < 0) {
fail("{setsockopt: IPV6_MULTICAST_HOPS}");
}
}
}
#endif /* IPV6_ADD_MEMBERSHIP */
if (bind(s, ai->ai_addr, ai->ai_addrlen)) {
fail("{bind-socket}");
}
freeaddrinfo(ai);
return s;
}
#endif /*USE_SHARED_CACHE */
RSA *load_rsa_privatekey(SSL_CTX *ctx, const char *file) {
BIO *bio;
RSA *rsa;
bio = BIO_new_file(file, "r");
if (!bio) {
ERR_print_errors_fp(stderr);
return NULL;
}
rsa = PEM_read_bio_RSAPrivateKey(bio, NULL,
ctx->default_passwd_callback, ctx->default_passwd_callback_userdata);
BIO_free(bio);
return rsa;
}
static int
verify_callback (int ok, X509_STORE_CTX *ctx)
{
SSL* ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
proxystate *ps = (proxystate *)SSL_get_app_data(ssl);
LOGPROXY(ps, "ssl verify callback ok=%d\n", ok);
if (ok) {
if (CONFIG->PINNED_CERT_DIGEST) {
X509 *cert;
unsigned char md[EVP_MAX_MD_SIZE];
unsigned int mdlen;
cert = X509_STORE_CTX_get_current_cert(ctx);
if (cert) {
if (X509_digest(cert, EVP_sha1(), md, &mdlen)) {
if (memcmp(md, CONFIG->PINNED_CERT_DIGEST, mdlen)) {
ERRPROXY(ps, "pinned certificate mismatch\n");
ok = 0;
} else {
LOGPROXY(ps, "pinned peer certificate verified\n");
}
} else {
ERRPROXY(ps, "error computing pinned certificate digest\n");
ok = 0;
}
} else {
ERRPROXY(ps, "no certificate was supplied\n");
}
}
}
return ok;
}
/* Init library and load specified certificate.
* Establishes a SSL_ctx, to act as a template for
* each connection */
SSL_CTX * init_openssl(int sha2) {
SSL_library_init();
SSL_load_error_strings();
SSL_CTX *ctx = NULL;
RSA *rsa;
char *cert_file;
long ssloptions = SSL_OP_NO_SSLv2 | SSL_OP_ALL |
SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION;
if (CONFIG->ETYPE == ENC_TLS) {
ssloptions |= SSL_OP_NO_SSLv3;
}
ctx = SSL_CTX_new((CONFIG->PMODE == SSL_CLIENT) ? SSLv23_client_method() : SSLv23_server_method());
#ifdef SSL_OP_NO_COMPRESSION
ssloptions |= SSL_OP_NO_COMPRESSION;
#endif
SSL_CTX_set_options(ctx, ssloptions);
SSL_CTX_set_info_callback(ctx, info_callback);
SSL_CTX_set_tlsext_servername_callback(ctx, servername_callback);
SSL_CTX_set_alpn_select_cb(ctx, alpn_callback, NULL);
if (CONFIG->CA_FILE) {
SSL_CTX_load_verify_locations(ctx, CONFIG->CA_FILE, NULL);
}
if (CONFIG->ENGINE) {
ENGINE *e = NULL;
ENGINE_load_builtin_engines();
if (!strcmp(CONFIG->ENGINE, "auto"))
ENGINE_register_all_complete();
else {
if ((e = ENGINE_by_id(CONFIG->ENGINE)) == NULL ||
!ENGINE_init(e) ||
!ENGINE_set_default(e, ENGINE_METHOD_ALL)) {
ERR_print_errors_fp(stderr);
exit(1);
}
LOG("{core} will use OpenSSL engine %s.\n", ENGINE_get_id(e));
ENGINE_finish(e);
ENGINE_free(e);
}
}
if (CONFIG->CIPHER_SUITE)
if (SSL_CTX_set_cipher_list(ctx, CONFIG->CIPHER_SUITE) != 1)
ERR_print_errors_fp(stderr);
if (CONFIG->PREFER_SERVER_CIPHERS)
SSL_CTX_set_options(ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
/* SSL_SERVER Mode stuff */
cert_file = CONFIG->CERT_FILE;
if (sha2) {
cert_file = CONFIG->CERT_FILE_SHA2;
}
if (SSL_CTX_use_certificate_chain_file(ctx, cert_file) <= 0) {
ERR_print_errors_fp(stderr);
exit(1);
}
rsa = load_rsa_privatekey(ctx, cert_file);
if(!rsa) {
ERR("Error loading rsa private key\n");
exit(1);
}
if (SSL_CTX_use_RSAPrivateKey(ctx,rsa) <= 0) {
ERR_print_errors_fp(stderr);
exit(1);
}
SSL_CTX_set_session_id_context(ctx, ssl_session_id_context, sizeof(ssl_session_id_context));
if (CONFIG->PMODE == SSL_CLIENT)
return ctx;
if (CONFIG->REQUIRE_PEER_CERT) {
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, verify_callback);
}
#ifndef OPENSSL_NO_DH
init_dh(ctx, cert_file);
#endif /* OPENSSL_NO_DH */
#ifdef USE_SHARED_CACHE
if (CONFIG->SHARED_CACHE) {
if (shared_context_init(ctx, CONFIG->SHARED_CACHE) < 0) {
ERR("Unable to alloc memory for shared cache.\n");
exit(1);
}
if (CONFIG->SHCUPD_PORT) {
if (compute_secret(rsa, shared_secret) < 0) {
ERR("Unable to compute shared secret.\n");
exit(1);
}
/* Force tls tickets cause keys differs */
SSL_CTX_set_options(ctx, SSL_OP_NO_TICKET);
if (*shcupd_peers) {
shsess_set_new_cbk(shcupd_session_new);
}
}
}
#endif
RSA_free(rsa);
return ctx;
}
static void prepare_proxy_line(struct sockaddr* ai_addr) {
tcp_proxy_line[0] = 0;
char tcp6_address_string[INET6_ADDRSTRLEN];
if (ai_addr->sa_family == AF_INET) {
struct sockaddr_in* addr = (struct sockaddr_in*)ai_addr;
size_t res = snprintf(tcp_proxy_line,
sizeof(tcp_proxy_line),
"PROXY %%s %%s %s %%hu %hu\r\n",
inet_ntoa(addr->sin_addr),
ntohs(addr->sin_port));
assert(res < sizeof(tcp_proxy_line));
}
else if (ai_addr->sa_family == AF_INET6 ) {
struct sockaddr_in6* addr = (struct sockaddr_in6*)ai_addr;
inet_ntop(AF_INET6,&(addr->sin6_addr),tcp6_address_string,INET6_ADDRSTRLEN);
size_t res = snprintf(tcp_proxy_line,
sizeof(tcp_proxy_line),
"PROXY %%s %%s %s %%hu %hu\r\n",
tcp6_address_string,
ntohs(addr->sin6_port));
assert(res < sizeof(tcp_proxy_line));
}
else {
ERR("The --write-proxy mode is not implemented for this address family.\n");
exit(1);
}
}
/* Create the bound socket in the parent process */
static int create_main_socket() {
struct addrinfo *ai = CONFIG->FRONTADDR->addr;
int s = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
if (s == -1)
fail("{socket: main}");
int t = 1;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &t, sizeof(int));
#ifdef SO_REUSEPORT
setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &t, sizeof(int));
#endif
setnonblocking(s);
if (CONFIG->RECV_BUFSIZE > 0) {
setsockopt(s, SOL_SOCKET, SO_RCVBUF, &CONFIG->RECV_BUFSIZE, sizeof(CONFIG->RECV_BUFSIZE));
}
if (CONFIG->SEND_BUFSIZE > 0) {
setsockopt(s, SOL_SOCKET, SO_SNDBUF, &CONFIG->SEND_BUFSIZE, sizeof(CONFIG->SEND_BUFSIZE));
}
if (bind(s, ai->ai_addr, ai->ai_addrlen)) {
fail("{bind-socket}");
}
#ifndef NO_DEFER_ACCEPT
#if TCP_DEFER_ACCEPT
int timeout = 1;
setsockopt(s, IPPROTO_TCP, TCP_DEFER_ACCEPT, &timeout, sizeof(int) );
#endif /* TCP_DEFER_ACCEPT */
#endif
prepare_proxy_line(ai->ai_addr);
freeaddrinfo(ai);
listen(s, CONFIG->BACKLOG);
return s;
}
static struct stud_config_addr* get_backaddr ()
{
struct stud_config_addr* a;
if (!backaddr) {
backaddr = CONFIG->BACKADDR;
if (!backaddr) {
backaddr = CONFIG->BACKADDR_DEFAULT;
}
}
a = backaddr;
backaddr = backaddr->next;
return a;
}
/* Initiate a clear-text nonblocking connect() to the backend IP on behalf
* of a newly connected upstream (encrypted) client*/
static int create_back_socket(const struct stud_config_addr* addr) {
int s = socket(addr->addr->ai_family, addr->addr->ai_socktype, addr->addr->ai_protocol);