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cf-server.c
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791 lines (671 loc) · 24.9 KB
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/*
* CuttleFish Server
* Copyright (C) Scott Weisman
*
* this program is meant to be invoked by stunnel
* traffic is via stdio; control is through a uds file
*/
#define CF_SERVER
#define MAX_BUFFER_SIZE 1024
#define LPVOID void *
#define SET_HIGH_FD(check, high) ((high) = ((((check) + 1) > (high)) ? ((check) + 1) : (high)))
#define SELECT_START(list, high) (high) = 0; FD_ZERO(list)
#define SELECT_ADD(list, fd, high) FD_SET((fd), (list)); SET_HIGH_FD((fd), (high))
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <stdarg.h>
#include <time.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <arpa/inet.h>
typedef struct
{
uint32_t id;
int8_t type;
int accept_socket;
int listen_socket;
char payload[MAX_BUFFER_SIZE];
unsigned int send_count;
unsigned int receive_count;
uint16_t local_port;
uint16_t remote_port;
} s_cf_socket;
char client_name[MAX_BUFFER_SIZE] = "";
const char *VERSION = "v4.0";
char control_path[MAX_BUFFER_SIZE] = "";
int control_listen, tunnel_in, tunnel_out;
time_t packet_read_time, packet_send_time;
int send_buffer(int socket, const char *buf, int len);
#include "common.h"
int event_handle(fd_set *p_fd_list);
int event_handle_control(int control_accept, char *buf);
void event_handle_local_accept(s_cf_socket *cf_socket);
void event_handle_local_data(s_cf_socket *cf_socket);
int do_select(int high_fd, fd_set *read_list, int usec, char *msg);
void set_pid(const char *control_path);
int bind_port(s_cf_socket *cf_socket);
int bind_uds(const char *control_path);
char *get_arg(const char *buf, const int n, const int terminate);
int main(int argc, char *argv[])
{
int opt, result;
char *env = getenv("SSL_CLIENT_DN"); // also available SSL_CLIENT_I_DN
if (!env)
return -1;
char *cn = strstr(env, "/CN=");
if (!cn && !(cn = strstr(env, " CN=")))
return -2;
# this assumes that CN is at end of SSL_CLIENT_DN; better to look for CN=\w+
strncpy(client_name, &cn[4], MAX_BUFFER_SIZE);
char *client_name_check = strchr(client_name, '/');
if (client_name_check)
*client_name_check = 0;
while ((opt = getopt(argc, argv, "p:l:")) != -1)
{
if (optarg)
{
switch (opt)
{
case 'p':
// path for uds control files eg "/usr/var/stunnel/pipes"
strncpy(control_path, optarg, MAX_BUFFER_SIZE);
if (control_path[strlen(control_path) - 1] != '/')
strncat(control_path, "/", MAX_BUFFER_SIZE);
break;
case 'l':
// log dir eg "/var/log/stunnel"
strncpy(log_file, optarg, MAX_BUFFER_SIZE);
strncat(log_file, "/cf-", MAX_BUFFER_SIZE);
strncat(log_file, client_name, MAX_BUFFER_SIZE);
strncat(log_file, ".log", MAX_BUFFER_SIZE);
break;
}
}
}
if (!control_path[0])
{
print_log("main: pipe dir missing; exiting");
return -3;
}
strncat(control_path, client_name, MAX_BUFFER_SIZE);
result = remove(control_path);
if (result < 0 && errno != ENOENT)
{
print_log("main: can't remove socket error %d; exiting", result);
return -4;
}
umask(0);
setvbuf(stdin, (char *) NULL, _IONBF, 0);
setvbuf(stdout, (char *) NULL, _IONBF, 0);
tunnel_in = fileno(stdin);
tunnel_out = fileno(stdout);
control_listen = bind_uds(control_path);
if (control_listen < 0)
{
print_log("main: client %s already connected; exiting", client_name);
return -5;
}
else if (!control_listen)
{
print_log("main: can't bind client %s; exiting", client_name);
return -6;
}
set_pid(control_path);
print_log("main: cf-server launched for client '%s'", client_name);
print_log("main: all sanity checks passed; entering event loop");
clear(cf_socket_list, sizeof(cf_socket_list));
packet_send_time = time(NULL);
packet_read_time = time(NULL);
for (;;)
{
s_cf_socket *cf_socket;
int check_socket;
int high_fd;
fd_set fd_list;
SELECT_START(&fd_list, high_fd);
// xxx add semaphore for exec commands. do not listen for any commands while an exec is in flight
// xxx either that or when an exec is running, wait for a first response packet before accepting other commands
// xxx or simply delay any other commands for a fixed length of time
SELECT_ADD(&fd_list, control_listen, high_fd);
SELECT_ADD(&fd_list, tunnel_in, high_fd);
for (uint32_t pos = 0; pos <= cf_socket_idx; pos++)
if ((cf_socket = cf_socket_list[pos]) && ((check_socket = cf_socket->accept_socket) || (check_socket = cf_socket->listen_socket)))
{
SELECT_ADD(&fd_list, check_socket, high_fd);
}
int select_count = do_select(high_fd, &fd_list, 100000, "wait all");
if (select_count > 0)
{
if (event_handle(&fd_list) < 0)
{
// xxx error
print_log("ERROR 1");
break;
}
}
else if (!select_count)
{
// xxx reduce semaphore count by 1 until 0
}
else
{
// xxx error
print_log("ERROR 2");
break;
}
if ((time(NULL) - packet_read_time) > 35)
{
// xxx 35 sec timeout hard-coded
print_log("main: network timeout (%d seconds); exiting", time(NULL) - packet_read_time);
break;
}
if ((time(NULL) - packet_send_time) > 25)
send_packet(0, CF_PACKET_PING, NULL, 0); // send keepalive packet every 25 secs - xxx hard-coded
}
print_log("main: event loop terminated; cleaning up");
// xxx move shutdown code to atexit() function
for (unsigned int pos = 0; pos <= cf_socket_idx; pos++)
if (cf_socket_list[pos])
cf_socket_free(cf_socket_list[pos]);
unlink(control_path);
remove(control_path);
return 0;
}
int event_handle(fd_set *p_fd_list)
{
int result;
uint32_t pos;
s_cf_socket *cf_socket;
char buf[MAX_PACKET_SIZE];
clear(buf, sizeof(buf));
print_log("event_handle: start");
///////////////////////////////////////////////////////////////////////
// data from local ports
///////////////////////////////////////////////////////////////////////
for (pos = 0; pos <= cf_socket_idx; pos++)
if ((cf_socket = cf_socket_list[pos]))
{
if (cf_socket->listen_socket && FD_ISSET(cf_socket->listen_socket, p_fd_list))
event_handle_local_accept(cf_socket);
else if (cf_socket->accept_socket && FD_ISSET(cf_socket->accept_socket, p_fd_list))
event_handle_local_data(cf_socket);
}
///////////////////////////////////////////////////////////////////////
// data from remote client
///////////////////////////////////////////////////////////////////////
if (FD_ISSET(tunnel_in, p_fd_list))
{
print_log("event_handle: client data received");
for (;;)
{
// xxx is this select() even needed? always wait for a complete packet to be received
int high_fd;
fd_set fd_list;
SELECT_START(&fd_list, high_fd);
SELECT_ADD(&fd_list, tunnel_in, high_fd);
if (do_select(high_fd, &fd_list, 10000, "wait tunnel") <= 0)
break;
if ((result = read(tunnel_in, buf, sizeof(buf))) <= 0)
{
// tunnel is closed, exit
print_log("event_handle: exit; read result=%d, errno=%d", result, errno);
return errno || result < 0 ? -1 : 0;
}
if (!queue_put(buf, result))
{
print_log("event_handle: queue_put error");
break;
}
if (queue_check())
break;
// a whole packet was not received, retry once to see if the next read will complete it
print_log("event_handle: incomplete or bad packet");
}
}
s_cf_packet *cf_packet;
int queue_loop_exit = 0;
while (!queue_loop_exit && (cf_packet = queue_get()))
{
print_log("event_handle: client data id=%d, type=%d, len=%d", cf_packet->id, cf_packet->type, cf_packet->len);
packet_read_time = time(NULL);
s_cf_socket *cf_socket;
switch (cf_packet->type)
{
case CF_PACKET_DISCONNECT:
print_log("event_handle: client-side disconnect");
// xxx end semaphore if exec socket
if ((cf_socket = cf_socket_find(cf_packet->id)))
cf_socket_free(cf_socket);
else
print_log("event_handle: client-side packet with bad id");
break;
case CF_PACKET_DATA:
print_log("event_handle: client-side data");
// xxx end semaphore if exec socket
if ((cf_socket = cf_socket_find(cf_packet->id)))
{
if (cf_socket->accept_socket)
{
cf_socket->receive_count += cf_packet->len;
send_buffer(cf_socket->accept_socket, (const char *) PACKET_PAYLOAD(cf_packet), cf_packet->len);
}
else
{
// xxx if accept_socket not set yet, then put packet back on queue
// if !queue_check() then set break_while_loop = 1;
// queue_put(cf_socket, PACKET_SIZE(cf_socket));
// if break_while_loop then break out of loop to avoid processing the packet over and over
// xxx problem if this messes up packet order for the stream; solution will be to redesign packet queue
print_log("event_handle: no accept_socket for client-side data");
queue_put(cf_socket, PACKET_SIZE(cf_packet));
queue_loop_exit = 1;
}
}
else
print_log("event_handle: client-side packet with bad id");
break;
case CF_PACKET_PING:
print_log("event_handle: client-side ping");
break;
case CF_PACKET_MESSAGE:
print_log("event_handle: client-side message");
// xxx print_log("%.32s", PACKET_PAYLOAD(cf_packet));
break;
default:
print_log("event_handle: client data ERROR UKNOWN OR INVALID TYPE id=%d type=%d", cf_packet->id, cf_packet->type);
break;
}
print_log("event_handle: client data end");
}
///////////////////////////////////////////////////////////////////////
// data from control socket
///////////////////////////////////////////////////////////////////////
if (FD_ISSET(control_listen, p_fd_list))
{
print_log("event_handle: control_listen data received");
struct sockaddr_un accept_addr;
socklen_t sockaddr_un_len = sizeof(struct sockaddr_un);
int control_accept = accept(control_listen, (struct sockaddr *) &accept_addr, &sockaddr_un_len);
if (control_accept > 0)
{
do
{
if ((result = read(control_accept, buf, sizeof(buf))) <= 0)
{
errno ?
print_log("event_handle: request socket read error %d = %s", errno, strerror(errno)) :
print_log("event_handle: request socket has no data; closing");
break;
}
buf[result] = 0;
if (buf[result - 1] < 33)
buf[result - 1] = 0;
print_log("event_handle control_accept data: %d '%s'", result, buf);
if (event_handle_control(control_accept, buf))
return -2;
print_log("event_handle: request processed");
} while (0);
print_log("event_handle: closing control_accept socket");
close(control_accept);
}
else
print_log("event_handle: accept error %d", errno);
}
return 0;
}
int event_handle_control(int control_accept, char *buf)
{
char msg[MAX_BUFFER_SIZE];
s_cf_socket *cf_socket;
char *arg = strchr(buf, ' ') + 1;
if (buf[0] == 'C' && buf[1] == 'O')
{
// CONNECT local_port host remote_port
print_log("event_handle_control: CONNECT command received '%s'", arg);
if ((cf_socket = cf_socket_new()))
{
// xxx check arg != NULL
cf_socket->local_port = atoi(get_arg(arg, 0, 1));
strncpy(cf_socket->payload, get_arg(arg, 1, 1), MAX_BUFFER_SIZE);
cf_socket->remote_port = atoi(get_arg(arg, 2, 1));
// xxx check payload and local_port and remote_port
if (!cf_socket->remote_port || bind_port(cf_socket))
{
send_buffer(control_accept, "CONNECT FAIL\n", -1);
cf_socket_free(cf_socket);
}
else
{
sprintf(msg, "CONNECT SUCCESS %d\n", cf_socket->local_port);
send_buffer(control_accept, msg, -1);
}
}
else
{
// xxx error
print_log("ERROR 4");
}
}
else if (buf[0] == 'E')
{
// EXEC local_port command
print_log("event_handle_control: EXEC command received '%s'", arg);
if ((cf_socket = cf_socket_new()))
{
// xxx check arg != NULL
cf_socket->type = CF_SOCKET_EXEC;
cf_socket->local_port = atoi(get_arg(arg, 0, 1));
strncpy(cf_socket->payload, get_arg(arg, 1, 0), MAX_BUFFER_SIZE);
// xxx check payload and local_port
if (bind_port(cf_socket))
{
send_buffer(control_accept, "EXEC FAIL\n", -1);
cf_socket_free(cf_socket);
}
else
{
sprintf(msg, "EXEC SUCCESS %d\n", cf_socket->local_port);
send_buffer(control_accept, msg, -1);
}
// send exec packet here not below because we always want to run the program
// xxx this is a potential race condition because we could get back data from the exec
// xxx before the local side connects to the listening socket
// xxx set exec semaphore here
}
else
{
// xxx error
print_log("ERROR 5");
}
}
else if (buf[0] == 'F')
{
// FILE local_port file_name
print_log("event_handle_control: FILE command received '%s'", arg);
if ((cf_socket = cf_socket_new()))
{
// xxx check arg != NULL
cf_socket->type = CF_SOCKET_FILE;
cf_socket->local_port = atoi(get_arg(arg, 0, 1));
strncpy(cf_socket->payload, get_arg(arg, 1, 0), MAX_BUFFER_SIZE);
// xxx check payload and local_port
if (bind_port(cf_socket))
{
send_buffer(control_accept, "FILE FAIL\n", -1);
cf_socket_free(cf_socket);
}
else
{
sprintf(msg, "FILE SUCCESS %d\n", cf_socket->local_port);
send_buffer(control_accept, msg, -1);
}
}
else
{
// xxx error
print_log("ERROR 6");
}
}
else if (buf[0] == 'C' && buf[1] == 'L')
{
print_log("event_handle_control: CLOSE command received");
send_buffer(control_accept, "CLOSING\n", -1);
return -1;
}
else if (buf[0] == 'P')
{
print_log("event_handle_control: PING command received");
send_packet(0, CF_PACKET_PING, NULL, 0);
}
else if (buf[0] == 'L' && buf[0] == 'I')
{
print_log("event_handle_control: LIST command received");
for (uint32_t pos = 0; pos <= cf_socket_idx; pos++)
if ((cf_socket = cf_socket_list[pos]))
{
sprintf(msg, "ID=%d\tLOCAL_PORT=%d\tREMOTE_PORT=%d\tTYPE=%s\tSTATUS=%s\tPAYLOAD=\"%s\"\n",
cf_socket->id,
cf_socket->local_port,
cf_socket->remote_port,
(cf_socket->remote_port ? "socket" : "command"),
(cf_socket->accept_socket ? "active" : "waiting"),
cf_socket->payload);
send_buffer(control_accept, msg, -1);
}
}
else if (buf[0] == 'L' && buf[0] == 'O')
{
print_log("event_handle_control: LOG command received");
char payload[MAX_BUFFER_SIZE];
strncpy(payload, get_arg(arg, 0, 1), MAX_BUFFER_SIZE);
send_packet(0, CF_PACKET_LOG, (void *) payload, strlen(payload) + 1);
}
else if (buf[0] == 'S')
{
print_log("event_handle_control: STATUS command received");
sprintf(msg, "LAST_PING=T-%dsec\n", (int) (time(NULL) - packet_read_time));
send_buffer(control_accept, msg, -1);
}
return 0;
}
void event_handle_local_accept(s_cf_socket *cf_socket)
{
struct sockaddr_in accept_addr;
socklen_t sockaddr_in_len = sizeof(struct sockaddr_in);
print_log("event_handle_local_accept: listen socket %d", cf_socket->listen_socket);
if ((cf_socket->accept_socket = accept(cf_socket->listen_socket, (struct sockaddr *) &accept_addr, &sockaddr_in_len)) < 0)
print_log("event_handle_local_accept: failed for accept()");
else
{
print_log("event_handle_local_accept: accept %d from listen socket", cf_socket->accept_socket);
print_log("event_handle_local_accept: setting upstream tunnel for accept socket %d", cf_socket->accept_socket);
switch (cf_socket->type)
{
case CF_SOCKET_PING:
// ping has no listen socket; do nothing here
// xxx in fact, this is an error
break;
case CF_SOCKET_EXEC:
send_packet(cf_socket->id, CF_PACKET_EXEC, (void *) cf_socket->payload, strlen(cf_socket->payload) + 1);
break;
case CF_SOCKET_FILE:
send_packet(cf_socket->id, CF_PACKET_FILE, (void *) cf_socket->payload, strlen(cf_socket->payload) + 1);
break;
default:
if (cf_socket->remote_port)
{
char payload[MAX_BUFFER_SIZE];
send_packet(cf_socket->id, CF_PACKET_CONNECT, (void *) payload, sprintf(payload, "%s:%d", cf_socket->payload, cf_socket->remote_port) + 1);
}
break;
}
}
// we only accept one socket so close listen socket now
close(cf_socket->listen_socket);
cf_socket->listen_socket = 0;
}
void event_handle_local_data(s_cf_socket *cf_socket)
{
char buf[MAX_BUFFER_SIZE];
int result, count = 0;
print_log("event_handle_local_data: accept socket %d", cf_socket->accept_socket);
for (;;)
{
if ((result = read(cf_socket->accept_socket, buf, sizeof(buf))) <= 0)
{
print_log("event_handle_local_data: server-side socket disconnect");
send_packet(cf_socket->id, CF_PACKET_DISCONNECT, NULL, 0);
cf_socket_free(cf_socket);
break;
}
else
{
print_log("event_handle_local_data: server-side data received %d", result);
cf_socket->send_count += result;
send_packet(cf_socket->id, CF_PACKET_DATA, buf, result);
}
if (++count > 4)
break;
int high_fd;
fd_set fd_list;
SELECT_START(&fd_list, high_fd);
SELECT_ADD(&fd_list, cf_socket->accept_socket, high_fd);
if (do_select(high_fd, &fd_list, 10000, "wait local data") <= 0)
break;
}
}
int send_buffer(int socket, const char *buf, int len)
{
int total_sent = 0;
if (len < 0)
len = strlen(buf);
if (!socket)
{
print_log("send_buffer: bad socket descriptor");
return -1;
}
else if (socket < 0)
socket = tunnel_out; // send to tunnel
while (len > 0)
{
// xxx reset send time
int n = write(socket, buf + total_sent, len);
if (n < 0)
{
errno ?
print_log("send_buffer: failed to send_buffer data on socket id=%d, errno=%d, errstr=%s", socket ? socket : -1, errno, strerror(errno)) :
print_log("send_buffer: failed to send_buffer data on socket id=%d", socket ? socket : -1);
return -1;
}
else if (!n)
print_log("send_buffer: no data written on socket id=%d, requested=%d", socket ? socket : -1, len);
else if (socket == tunnel_out)
packet_send_time = time(NULL); // reset the send timeout
total_sent += n;
len -= n;
}
return 0;
}
void set_pid(const char *control_path)
{
char pid_path[MAX_BUFFER_SIZE] = "";
strncpy(pid_path, control_path, MAX_BUFFER_SIZE);
strncat(pid_path, ".pid", MAX_BUFFER_SIZE);
FILE *pid_fd = fopen(pid_path, "w");
fprintf(pid_fd, "%d", getpid());
fflush(pid_fd);
fclose(pid_fd);
}
int bind_uds(const char *control_path)
{
struct sockaddr_un addr;
clear(&addr, sizeof(addr));
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, control_path);
int sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock < 0)
{
print_log("bind_uds: socket failed");
return sock;
}
else if (bind(sock, (struct sockaddr *) &addr, sizeof(addr.sun_family) + strlen(addr.sun_path)))
{
print_log("bind_uds: failed binding to path: %s", control_path);
close(sock);
return 0;
}
else if (listen(sock, 16))
{
print_log("bind_uds: listen failed: %d", errno);
close(sock);
return 0;
}
struct stat stat_data;
if (stat(control_path, &stat_data))
{
print_log("bind_uds: %s doesn't exist %d", control_path, errno);
close(sock);
return 0;
}
return sock;
}
int bind_port(s_cf_socket *cf_socket)
{
struct sockaddr addr_result;
struct sockaddr_in addr_in;
int result;
const int on = 1;
uint addr_len = sizeof(addr_result);
print_log("bind_port %d", cf_socket->local_port);
clear(&addr_in, sizeof(struct sockaddr_in));
addr_in.sin_family = AF_INET;
addr_in.sin_addr.s_addr = INADDR_ANY;
addr_in.sin_port = htons(cf_socket->local_port);
if ((cf_socket->listen_socket = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
print_log("bind_port %d failed for socket()", cf_socket->local_port);
return -1;
}
if (bind(cf_socket->listen_socket, (struct sockaddr *) &addr_in, sizeof(addr_in)) < 0)
{
print_log("bind_port %d failed for bind()", cf_socket->local_port);
close(cf_socket->listen_socket);
return -2;
}
if (!cf_socket->local_port)
{
getsockname(cf_socket->listen_socket, &addr_result, &addr_len);
cf_socket->local_port = ntohs(((struct sockaddr_in *) &addr_result)->sin_port);
}
if (setsockopt(cf_socket->listen_socket, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(int)) < 0)
{
print_log("bind_port %d failed for setsockopt()", cf_socket->local_port);
close(cf_socket->listen_socket);
return -3;
}
if ((result = listen(cf_socket->listen_socket, 2)))
{
print_log("bind_port %d failed for listen()", cf_socket->local_port);
close(cf_socket->listen_socket);
return -4;
}
print_log("bind_port local_port=%d remote_port=%d payload={%s}", cf_socket->local_port, cf_socket->remote_port, cf_socket->payload);
return 0;
}
char *get_arg(const char *buf, const int n, const int terminate)
{
static char arg[MAX_BUFFER_SIZE];
char *result = arg;
strncpy(arg, buf, MAX_BUFFER_SIZE);
for (int i = 0; i < n; i++)
result = strchr(result, ' ') + 1;
if (terminate)
{
char *end = strchr(result, ' ');
if (end)
*end = 0;
}
print_log("arg %d '%s'", n, result);
return result;
}
int do_select(int high_fd, fd_set *read_list, int usec, char *msg)
{
struct timeval tv = {0, usec};
int result = select(high_fd, read_list, NULL, NULL, &tv);
if (result < 0)
{
errno ?
print_log("do_select: ERROR %s result=%d, errno=%d, errstr=%s", msg, result, errno, strerror(errno)) :
print_log("do_select: ERROR %s result=%d", msg, result);
}
return result;
}
/*
* xxx modify to work with http://www.fehcom.de/ipnet/ucspi-ssl.html or http://smarden.org/ipsvd/ or http://homepage.ntlworld.com/jonathan.deboynepollard/Softwares/nosh/ or netcat instead of stunnel
*/