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stud.c
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/**
* 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 <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 <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"
#ifndef MSG_NOSIGNAL
# define MSG_NOSIGNAL 0
#endif
#ifndef AI_ADDRCONFIG
# define AI_ADDRCONFIG 0
#endif
/* Globals */
static struct ev_loop *loop;
static struct addrinfo *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;
/* Command line Options */
typedef enum {
ENC_TLS,
ENC_SSL
} ENC_TYPE;
typedef struct stud_options {
ENC_TYPE ETYPE;
int WRITE_IP_OCTET;
int WRITE_PROXY_LINE;
const char* CHROOT;
uid_t UID;
gid_t GID;
const char *FRONT_IP;
const char *FRONT_PORT;
const char *BACK_IP;
const char *BACK_PORT;
long NCORES;
const char *CERT_FILE;
const char *CIPHER_SUITE;
const char *ENGINE;
int BACKLOG;
#ifdef USE_SHARED_CACHE
int SHARED_CACHE;
#endif
int QUIET;
int SYSLOG;
int TCP_KEEPALIVE;
} stud_options;
static stud_options OPTIONS = {
ENC_TLS, // ETYPE
0, // WRITE_IP_OCTET
0, // WRITE_PROXY_LINE
NULL, // CHROOT
0, // UID
0, // GID
NULL, // FRONT_IP
"8443", // FRONT_PORT
"127.0.0.1", // BACK_IP
"8000", // BACK_PORT
1, // NCORES
NULL, // CERT_FILE
NULL, // CIPHER_SUITE
NULL, // ENGINE
100, // BACKLOG
#ifdef USE_SHARED_CACHE
0, // SHARED_CACHE
#endif
0, // QUIET
0, // SYSLOG
3600 // TCP_KEEPALIVE
};
static char tcp_proxy_line[128] = "";
/* What agent/state requests the shutdown--for proper half-closed
* handling */
typedef enum _SHUTDOWN_REQUESTOR {
SHUTDOWN_HARD,
SHUTDOWN_DOWN,
SHUTDOWN_UP
} SHUTDOWN_REQUESTOR;
/*
* Proxied State
*
* All state associated with one proxied connection
*/
typedef struct proxystate {
ringbuffer ring_down; /* pushing bytes from client to backend */
ringbuffer ring_up; /* pushing bytes from backend to client */
ev_io ev_r_up; /* Upstream write event */
ev_io ev_w_up; /* Upstream read event */
ev_io ev_r_handshake; /* Downstream write event */
ev_io ev_w_handshake; /* Downstream read event */
ev_io ev_r_down; /* Downstream write event */
ev_io ev_w_down; /* Downstream read event */
int fd_up; /* Upstream (client) socket */
int fd_down; /* Downstream (backend) socket */
int want_shutdown:1; /* Connection is half-shutdown */
int handshaked:1; /* Initial handshake happened */
int renegotiation:1; /* Renegotation is occuring */
SSL *ssl; /* OpenSSL SSL state */
struct sockaddr_storage remote_ip; /* Remote ip returned from `accept` */
} proxystate;
#define LOG(...) \
do { \
if (!OPTIONS.QUIET) fprintf(stdout, __VA_ARGS__); \
if (OPTIONS.SYSLOG) syslog(LOG_INFO, __VA_ARGS__); \
} while(0)
#define ERR(...) \
do { \
fprintf(stderr, __VA_ARGS__); \
if (OPTIONS.SYSLOG) syslog(LOG_ERR, __VA_ARGS__); \
} while(0)
/* set a file descriptor (socket) to non-blocking mode */
static void setnonblocking(int fd) {
int flag = 1;
assert (ioctl(fd, FIONBIO, &flag) == 0);
}
/* 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) {
ERR("Error activating SO_KEEPALIVE on client socket: %s", strerror(errno));
}
optval = OPTIONS.TCP_KEEPALIVE;
optlen = sizeof(optval);
if(setsockopt(fd, SOL_TCP, TCP_KEEPIDLE, &optval, optlen) < 0) {
ERR("Error setting TCP_KEEPIDLE on client socket: %s", strerror(errno));
}
}
static void fail(const char* s) {
perror(s);
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);
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) {
(void)ret;
if (where & SSL_CB_HANDSHAKE_START) {
proxystate *ps = (proxystate *)SSL_get_app_data(ssl);
if (ps->handshaked) {
ps->renegotiation = 1;
LOG("{core} SSL renegotiation asked by client\n");
}
}
}
/* Init library and load specified certificate.
* Establishes a SSL_ctx, to act as a template for
* each connection */
static SSL_CTX * init_openssl() {
SSL_library_init();
SSL_load_error_strings();
SSL_CTX *ctx = NULL;
long ssloptions = SSL_OP_NO_SSLv2 | SSL_OP_ALL |
SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION;
if (OPTIONS.ETYPE == ENC_TLS)
ctx = SSL_CTX_new(TLSv1_server_method());
else if (OPTIONS.ETYPE == ENC_SSL)
ctx = SSL_CTX_new(SSLv23_server_method());
else
assert(OPTIONS.ETYPE == ENC_TLS || OPTIONS.ETYPE == ENC_SSL);
#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);
if (SSL_CTX_use_certificate_chain_file(ctx, OPTIONS.CERT_FILE) <= 0) {
ERR_print_errors_fp(stderr);
exit(1);
}
if (SSL_CTX_use_RSAPrivateKey_file(ctx, OPTIONS.CERT_FILE, SSL_FILETYPE_PEM) <= 0) {
ERR_print_errors_fp(stderr);
exit(1);
}
#ifndef OPENSSL_NO_DH
init_dh(ctx, OPTIONS.CERT_FILE);
#endif /* OPENSSL_NO_DH */
if (OPTIONS.ENGINE) {
ENGINE *e = NULL;
ENGINE_load_builtin_engines();
if (!strcmp(OPTIONS.ENGINE, "auto"))
ENGINE_register_all_complete();
else {
if ((e = ENGINE_by_id(OPTIONS.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 (OPTIONS.CIPHER_SUITE)
if (SSL_CTX_set_cipher_list(ctx, OPTIONS.CIPHER_SUITE) != 1)
ERR_print_errors_fp(stderr);
#ifdef USE_SHARED_CACHE
if (OPTIONS.SHARED_CACHE) {
if (shared_context_init(ctx, OPTIONS.SHARED_CACHE) < 0) {
ERR("Unable to alloc memory for shared cache.\n");
exit(1);
}
}
#endif
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, hints;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
const int gai_err = getaddrinfo(OPTIONS.FRONT_IP, OPTIONS.FRONT_PORT,
&hints, &ai);
if (gai_err != 0) {
ERR("{getaddrinfo}: [%s]\n", gai_strerror(gai_err));
exit(1);
}
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 (bind(s, ai->ai_addr, ai->ai_addrlen)) {
fail("{bind-socket}");
}
#if TCP_DEFER_ACCEPT
int timeout = 1;
setsockopt(s, IPPROTO_TCP, TCP_DEFER_ACCEPT, &timeout, sizeof(int) );
#endif /* TCP_DEFER_ACCEPT */
prepare_proxy_line(ai->ai_addr);
freeaddrinfo(ai);
listen(s, OPTIONS.BACKLOG);
return s;
}
/* Initiate a clear-text nonblocking connect() to the backend IP on behalf
* of a newly connected upstream (encrypted) client*/
static int create_back_socket() {
int s = socket(backaddr->ai_family, SOCK_STREAM, IPPROTO_TCP);
if (s == -1)
return -1;
int flag = 1;
int ret = setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (char *)&flag, sizeof(flag));
if (ret == -1) {
perror("Couldn't setsockopt to backend (TCP_NODELAY)\n");
}
int t = 1;
setnonblocking(s);
t = connect(s, backaddr->ai_addr, backaddr->ai_addrlen);
if (t == 0 || errno == EINPROGRESS || errno == EINTR)
return s;
perror("{backend-connect}");
return -1;
}
/* Only enable a libev ev_io event if the proxied connection still
* has both up and down connected */
static void safe_enable_io(proxystate *ps, ev_io *w) {
if (!ps->want_shutdown)
ev_io_start(loop, w);
}
/* Only enable a libev ev_io event if the proxied connection still
* has both up and down connected */
static void shutdown_proxy(proxystate *ps, SHUTDOWN_REQUESTOR req) {
if (ps->want_shutdown || req == SHUTDOWN_HARD) {
ev_io_stop(loop, &ps->ev_w_up);
ev_io_stop(loop, &ps->ev_r_up);
ev_io_stop(loop, &ps->ev_w_handshake);
ev_io_stop(loop, &ps->ev_r_handshake);
ev_io_stop(loop, &ps->ev_w_down);
ev_io_stop(loop, &ps->ev_r_down);
close(ps->fd_up);
close(ps->fd_down);
SSL_set_shutdown(ps->ssl, SSL_SENT_SHUTDOWN);
SSL_free(ps->ssl);
free(ps);
}
else {
ps->want_shutdown = 1;
if (req == SHUTDOWN_DOWN && ringbuffer_is_empty(&ps->ring_up))
shutdown_proxy(ps, SHUTDOWN_HARD);
else if (req == SHUTDOWN_UP && ringbuffer_is_empty(&ps->ring_down))
shutdown_proxy(ps, SHUTDOWN_HARD);
}
}
/* Handle various socket errors */
static void handle_socket_errno(proxystate *ps) {
if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)
return;
if (errno == ECONNRESET)
ERR("{backend} Connection reset by peer\n");
else if (errno == ETIMEDOUT)
ERR("{backend} Connection to backend timed out\n");
else if (errno == EPIPE)
ERR("{backend} Broken pipe to backend (EPIPE)\n");
else
perror("{backend} [errno]");
shutdown_proxy(ps, SHUTDOWN_DOWN);
}
/* Read some data from the backend when libev says data is available--
* write it into the upstream buffer and make sure the write event is
* enabled for the upstream socket */
static void back_read(struct ev_loop *loop, ev_io *w, int revents) {
(void) revents;
int t;
proxystate *ps = (proxystate *)w->data;
if (ps->want_shutdown) {
ev_io_stop(loop, &ps->ev_r_down);
return;
}
int fd = w->fd;
char * buf = ringbuffer_write_ptr(&ps->ring_up);
t = recv(fd, buf, RING_DATA_LEN, 0);
if (t > 0) {
ringbuffer_write_append(&ps->ring_up, t);
if (ringbuffer_is_full(&ps->ring_up))
ev_io_stop(loop, &ps->ev_r_down);
safe_enable_io(ps, &ps->ev_w_up);
}
else if (t == 0) {
LOG("{backend} Connection closed\n");
shutdown_proxy(ps, SHUTDOWN_DOWN);
}
else {
assert(t == -1);
handle_socket_errno(ps);
}
}
/* Write some data, previously received on the secure upstream socket,
* out of the downstream buffer and onto the backend socket */
static void back_write(struct ev_loop *loop, ev_io *w, int revents) {
(void) revents;
int t;
proxystate *ps = (proxystate *)w->data;
int fd = w->fd;
int sz;
assert(!ringbuffer_is_empty(&ps->ring_down));
char *next = ringbuffer_read_next(&ps->ring_down, &sz);
t = send(fd, next, sz, MSG_NOSIGNAL);
if (t > 0) {
if (t == sz) {
ringbuffer_read_pop(&ps->ring_down);
safe_enable_io(ps, &ps->ev_r_up);
if (ringbuffer_is_empty(&ps->ring_down)) {
if (ps->want_shutdown) {
shutdown_proxy(ps, SHUTDOWN_HARD);
return; // dealloc'd
}
ev_io_stop(loop, &ps->ev_w_down);
}
}
else {
ringbuffer_read_skip(&ps->ring_down, t);
}
}
else {
assert(t == -1);
handle_socket_errno(ps);
}
}
static void start_handshake(proxystate *ps, int err);
/* Continue/complete the asynchronous connect() before starting data transmission
* between front/backend */
static void handle_connect(struct ev_loop *loop, ev_io *w, int revents) {
(void) revents;
int t;
proxystate *ps = (proxystate *)w->data;
char tcp6_address_string[INET6_ADDRSTRLEN];
size_t written = 0;
t = connect(ps->fd_down, backaddr->ai_addr, backaddr->ai_addrlen);
if (!t || errno == EISCONN || !errno) {
/* INIT */
ev_io_stop(loop, &ps->ev_w_down);
ev_io_init(&ps->ev_r_down, back_read, ps->fd_down, EV_READ);
ev_io_init(&ps->ev_w_down, back_write, ps->fd_down, EV_WRITE);
start_handshake(ps, SSL_ERROR_WANT_READ); /* for client-first handshake */
ev_io_start(loop, &ps->ev_r_down);
if (OPTIONS.WRITE_PROXY_LINE) {
char *ring_pnt = ringbuffer_write_ptr(&ps->ring_down);
assert(ps->remote_ip.ss_family == AF_INET ||
ps->remote_ip.ss_family == AF_INET6);
if(ps->remote_ip.ss_family == AF_INET) {
struct sockaddr_in* addr = (struct sockaddr_in*)&ps->remote_ip;
written = snprintf(ring_pnt,
RING_DATA_LEN,
tcp_proxy_line,
"TCP4",
inet_ntoa(addr->sin_addr),
ntohs(addr->sin_port));
}
else if (ps->remote_ip.ss_family == AF_INET6) {
struct sockaddr_in6* addr = (struct sockaddr_in6*)&ps->remote_ip;
inet_ntop(AF_INET6,&(addr->sin6_addr),tcp6_address_string,INET6_ADDRSTRLEN);
written = snprintf(ring_pnt,
RING_DATA_LEN,
tcp_proxy_line,
"TCP6",
tcp6_address_string,
ntohs(addr->sin6_port));
}
ringbuffer_write_append(&ps->ring_down, written);
ev_io_start(loop, &ps->ev_w_down);
}
else if (OPTIONS.WRITE_IP_OCTET) {
char *ring_pnt = ringbuffer_write_ptr(&ps->ring_down);
assert(ps->remote_ip.ss_family == AF_INET ||
ps->remote_ip.ss_family == AF_INET6);
*ring_pnt++ = (unsigned char) ps->remote_ip.ss_family;
if (ps->remote_ip.ss_family == AF_INET6) {
memcpy(ring_pnt, &((struct sockaddr_in6 *) &ps->remote_ip)
->sin6_addr.s6_addr, 16U);
ringbuffer_write_append(&ps->ring_down, 1U + 16U);
} else {
memcpy(ring_pnt, &((struct sockaddr_in *) &ps->remote_ip)
->sin_addr.s_addr, 4U);
ringbuffer_write_append(&ps->ring_down, 1U + 4U);
}
ev_io_start(loop, &ps->ev_w_down);
}
}
else if (errno == EINPROGRESS || errno == EINTR || errno == EALREADY) {
/* do nothing, we'll get phoned home again... */
}
else {
perror("{backend-connect}");
shutdown_proxy(ps, SHUTDOWN_HARD);
}
}
/* Upon receiving a signal from OpenSSL that a handshake is required, re-wire
* the read/write events to hook up to the handshake handlers */
static void start_handshake(proxystate *ps, int err) {
ev_io_stop(loop, &ps->ev_r_up);
ev_io_stop(loop, &ps->ev_w_up);
if (err == SSL_ERROR_WANT_READ)
ev_io_start(loop, &ps->ev_r_handshake);
else if (err == SSL_ERROR_WANT_WRITE)
ev_io_start(loop, &ps->ev_w_handshake);
}
/* After OpenSSL is done with a handshake, re-wire standard read/write handlers
* for data transmission */
static void end_handshake(proxystate *ps) {
ev_io_stop(loop, &ps->ev_r_handshake);
ev_io_stop(loop, &ps->ev_w_handshake);
/* Disable renegotiation (CVE-2009-3555) */
if (ps->ssl->s3) {
ps->ssl->s3->flags |= SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS;
}
ps->handshaked = 1;
/* if incoming buffer is not full */
if (!ringbuffer_is_full(&ps->ring_down))
safe_enable_io(ps, &ps->ev_r_up);
/* if outgoing buffer is not empty */
if (!ringbuffer_is_empty(&ps->ring_up))
// not safe.. we want to resume stream even during half-closed
ev_io_start(loop, &ps->ev_w_up);
}
/* The libev I/O handler during the OpenSSL handshake phase. Basically, just
* let OpenSSL do what it likes with the socket and obey its requests for reads
* or writes */
static void client_handshake(struct ev_loop *loop, ev_io *w, int revents) {
(void) revents;
int t;
proxystate *ps = (proxystate *)w->data;
t = SSL_do_handshake(ps->ssl);
if (t == 1) {
end_handshake(ps);
}
else {
int err = SSL_get_error(ps->ssl, t);
if (err == SSL_ERROR_WANT_READ) {
ev_io_stop(loop, &ps->ev_w_handshake);
ev_io_start(loop, &ps->ev_r_handshake);
}
else if (err == SSL_ERROR_WANT_WRITE) {
ev_io_stop(loop, &ps->ev_r_handshake);
ev_io_start(loop, &ps->ev_w_handshake);
}
else if (err == SSL_ERROR_ZERO_RETURN) {
LOG("{client} Connection closed (in handshake)\n");
shutdown_proxy(ps, SHUTDOWN_UP);
}
else {
LOG("{client} Unexpected SSL error (in handshake): %d\n", err);
shutdown_proxy(ps, SHUTDOWN_UP);
}
}
}
/* Handle a socket error condition passed to us from OpenSSL */
static void handle_fatal_ssl_error(proxystate *ps, int err) {
if (err == SSL_ERROR_ZERO_RETURN)
ERR("{client} Connection closed (in data)\n");
else if (err == SSL_ERROR_SYSCALL)
if (errno == 0)
ERR("{client} Connection closed (in data)\n");
else
perror("{client} [errno] ");
else
ERR("{client} Unexpected SSL_read error: %d\n", err);
shutdown_proxy(ps, SHUTDOWN_UP);
}
/* Read some data from the upstream secure socket via OpenSSL,
* and buffer anything we get for writing to the backend */
static void client_read(struct ev_loop *loop, ev_io *w, int revents) {
(void) revents;
int t;
proxystate *ps = (proxystate *)w->data;
if (ps->want_shutdown) {
ev_io_stop(loop, &ps->ev_r_up);
return;
}
char * buf = ringbuffer_write_ptr(&ps->ring_down);
t = SSL_read(ps->ssl, buf, RING_DATA_LEN);
/* Fix CVE-2009-3555. Disable reneg if started by client. */
if (ps->renegotiation) {
shutdown_proxy(ps, SHUTDOWN_UP);
return;
}
if (t > 0) {
ringbuffer_write_append(&ps->ring_down, t);
if (ringbuffer_is_full(&ps->ring_down))
ev_io_stop(loop, &ps->ev_r_up);
safe_enable_io(ps, &ps->ev_w_down);
}
else {
int err = SSL_get_error(ps->ssl, t);
if (err == SSL_ERROR_WANT_WRITE) {
start_handshake(ps, err);
}
else if (err == SSL_ERROR_WANT_READ) { } /* incomplete SSL data */
else
handle_fatal_ssl_error(ps, err);
}
}
/* Write some previously-buffered backend data upstream on the
* secure socket using OpenSSL */
static void client_write(struct ev_loop *loop, ev_io *w, int revents) {
(void) revents;
int t;
int sz;
proxystate *ps = (proxystate *)w->data;
assert(!ringbuffer_is_empty(&ps->ring_up));
char * next = ringbuffer_read_next(&ps->ring_up, &sz);
t = SSL_write(ps->ssl, next, sz);
if (t > 0) {
if (t == sz) {
ringbuffer_read_pop(&ps->ring_up);
safe_enable_io(ps, &ps->ev_r_down); // can be re-enabled b/c we've popped
if (ringbuffer_is_empty(&ps->ring_up)) {
if (ps->want_shutdown) {
shutdown_proxy(ps, SHUTDOWN_HARD);
return;
}
ev_io_stop(loop, &ps->ev_w_up);
}
}
else {
ringbuffer_read_skip(&ps->ring_up, t);
}
}
else {
int err = SSL_get_error(ps->ssl, t);
if (err == SSL_ERROR_WANT_READ) {
start_handshake(ps, err);
}
else if (err == SSL_ERROR_WANT_WRITE) {} /* incomplete SSL data */
else
handle_fatal_ssl_error(ps, err);
}
}
/* libev read handler for the bound socket. Socket is accepted,
* the proxystate is allocated and initalized, and we're off the races
* connecting to the backend */
static void handle_accept(struct ev_loop *loop, ev_io *w, int revents) {
(void) revents;
struct sockaddr_storage addr;
socklen_t sl = sizeof(addr);
int client = accept(w->fd, (struct sockaddr *) &addr, &sl);
if (client == -1) {
switch (errno) {
case EMFILE:
ERR("{client} accept() failed; too many open files for this process\n");
break;
case ENFILE:
ERR("{client} accept() failed; too many open files for this system\n");
break;
case 'k':
OPTIONS.TCP_KEEPALIVE = atoi(optarg);
break;
default:
assert(errno == EINTR || errno == EWOULDBLOCK || errno == EAGAIN);
break;
}
return;
}
int flag = 1;
int ret = setsockopt(client, IPPROTO_TCP, TCP_NODELAY, (char *)&flag, sizeof(flag) );
if (ret == -1) {
perror("Couldn't setsockopt on client (TCP_NODELAY)\n");
}
#ifdef TCP_CWND
int cwnd = 10;
ret = setsockopt(client, IPPROTO_TCP, TCP_CWND, &cwnd, sizeof(cwnd));
if (ret == -1) {
perror("Couldn't setsockopt on client (TCP_CWND)\n");
}
#endif
setnonblocking(client);
settcpkeepalive(client);
int back = create_back_socket();
if (back == -1) {
close(client);
perror("{backend-connect}");
return;
}
SSL_CTX * ctx = (SSL_CTX *)w->data;
SSL *ssl = SSL_new(ctx);
long mode = SSL_MODE_ENABLE_PARTIAL_WRITE;
#ifdef SSL_MODE_RELEASE_BUFFERS
mode |= SSL_MODE_RELEASE_BUFFERS;
#endif
SSL_set_mode(ssl, mode);
SSL_set_accept_state(ssl);
SSL_set_fd(ssl, client);
proxystate *ps = (proxystate *)malloc(sizeof(proxystate));
ps->fd_up = client;
ps->fd_down = back;
ps->ssl = ssl;
ps->want_shutdown = 0;
ps->handshaked = 0;
ps->renegotiation = 0;
ps->remote_ip = addr;
ringbuffer_init(&ps->ring_up);
ringbuffer_init(&ps->ring_down);
/* set up events */
ev_io_init(&ps->ev_r_up, client_read, client, EV_READ);
ev_io_init(&ps->ev_w_up, client_write, client, EV_WRITE);
ev_io_init(&ps->ev_r_handshake, client_handshake, client, EV_READ);
ev_io_init(&ps->ev_w_handshake, client_handshake, client, EV_WRITE);
ev_io_init(&ps->ev_w_down, handle_connect, back, EV_WRITE);
ev_io_init(&ps->ev_r_down, back_read, back, EV_READ);
ev_io_start(loop, &ps->ev_w_down);
ps->ev_r_up.data = ps;
ps->ev_w_up.data = ps;
ps->ev_r_down.data = ps;
ps->ev_w_down.data = ps;
ps->ev_r_handshake.data = ps;
ps->ev_w_handshake.data = ps;
/* Link back proxystate to SSL state */
SSL_set_app_data(ssl, ps);
}
static void check_ppid(struct ev_loop *loop, ev_timer *w, int revents) {
(void) revents;
pid_t ppid = getppid();
if (ppid != master_pid) {
ERR("{core} Process %d detected parent death, closing listener socket.\n", child_num);
ev_timer_stop(loop, w);
ev_io_stop(loop, &listener);
close(listener_socket);
}
}
/* Set up the child (worker) process including libev event loop, read event
* on the bound socket, etc */
static void handle_connections() {
LOG("{core} Process %d online\n", child_num);
#if defined(CPU_ZERO) && defined(CPU_SET)
cpu_set_t cpus;
CPU_ZERO(&cpus);
CPU_SET(child_num, &cpus);
int res = sched_setaffinity(0, sizeof(cpus), &cpus);
if (!res)
LOG("{core} Successfully attached to CPU #%d\n", child_num);
else
ERR("{core-warning} Unable to attach to CPU #%d; do you have that many cores?\n", child_num);
#endif
loop = ev_default_loop(EVFLAG_AUTO);
ev_timer timer_ppid_check;
ev_timer_init(&timer_ppid_check, check_ppid, 1.0, 1.0);
ev_timer_start(loop, &timer_ppid_check);
ev_io_init(&listener, handle_accept, listener_socket, EV_READ);
listener.data = ssl_ctx;
ev_io_start(loop, &listener);
ev_loop(loop, 0);
ERR("{core} Child %d exiting.\n", child_num);
exit(1);
}
/* Print usage w/error message and exit failure */
static void usage_fail(const char *prog, const char *msg) {
if (msg)
fprintf(stderr, "%s: %s\n", prog, msg);
fprintf(stderr, "usage: %s [OPTION] PEM\n", prog);
fprintf(stderr,
"Encryption Methods:\n"
" --tls TLSv1 (default)\n"
" --ssl SSLv3 (implies no TLSv1)\n"
" -c CIPHER_SUITE set allowed ciphers (default is OpenSSL defaults)\n"
" -e ENGINE set OpenSSL engine\n"
"\n"
"Socket:\n"
" -b HOST,PORT backend [connect] (default is \"127.0.0.1,8000\")\n"
" -f HOST,PORT frontend [bind] (default is \"*,8443\")\n"
"\n"
"Performance:\n"
" -n CORES number of worker processes (default is 1)\n"
" -B BACKLOG set listen backlog size (default is 100)\n"
" -k SECS Change default tcp keepalive on client socket\n"
#ifdef USE_SHARED_CACHE
" -C SHARED_CACHE set shared cache size in sessions (default no shared cache)\n"
#endif
"\n"
"Security:\n"
" -r PATH chroot\n"
" -u USERNAME set gid/uid after binding the socket\n"
"\n"
"Logging:\n"
" -q be quiet; emit only error messages\n"
" -s send log message to syslog in addition to stderr/stdout\n"
"\n"
"Special:\n"
" --write-ip write 1 octet with the IP family followed by the IP\n"
" address in 4 (IPv4) or 16 (IPv6) octets little-endian\n"
" to backend before the actual data\n"
" --write-proxy write HaProxy's PROXY (IPv4 or IPv6) protocol line\n"
" before actual data\n"
);
exit(1);
}
static void parse_host_and_port(const char *prog, const char *name, char *inp, int wildcard_okay, const char **ip, const char **port) {
char buf[150];
char *sp;
if (strlen(inp) >= sizeof buf) {
snprintf(buf, sizeof buf, "invalid option for %s HOST,PORT\n", name);
usage_fail(prog, buf);
}
sp = strchr(inp, ',');
if (!sp) {
snprintf(buf, sizeof buf, "invalid option for %s HOST,PORT\n", name);
usage_fail(prog, buf);
}
if (!strncmp(inp, "*", sp - inp)) {
if (!wildcard_okay) {
snprintf(buf, sizeof buf, "wildcard host specification invalid for %s\n", name);
usage_fail(prog, buf);
}
*ip = NULL;
}
else {
*sp = 0;
*ip = inp;
}
*port = sp + 1;
}
/* Handle command line arguments modifying behavior */
static void parse_cli(int argc, char **argv) {
const char *prog = argv[0];
static int tls = 0, ssl = 0;
int c;
struct passwd* passwd;
static struct option long_options[] =
{
{"tls", 0, &tls, 1},
{"ssl", 0, &ssl, 1},
{"write-ip", 0, &OPTIONS.WRITE_IP_OCTET, 1},
{"write-proxy", 0, &OPTIONS.WRITE_PROXY_LINE, 1},