summaryrefslogtreecommitdiff
path: root/socks.c
diff options
context:
space:
mode:
Diffstat (limited to 'socks.c')
-rw-r--r--socks.c551
1 files changed, 0 insertions, 551 deletions
diff --git a/socks.c b/socks.c
deleted file mode 100644
index 8287274..0000000
--- a/socks.c
+++ /dev/null
@@ -1,551 +0,0 @@
-/*
- * OpenVPN -- An application to securely tunnel IP networks
- * over a single TCP/UDP port, with support for SSL/TLS-based
- * session authentication and key exchange,
- * packet encryption, packet authentication, and
- * packet compression.
- *
- * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program (see the file COPYING included with this
- * distribution); if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-/*
- * 2004-01-30: Added Socks5 proxy support, see RFC 1928
- * (Christof Meerwald, http://cmeerw.org)
- *
- * 2010-10-10: Added Socks5 plain text authentication support (RFC 1929)
- * (Pierre Bourdon <delroth@gmail.com>)
- */
-
-#include "syshead.h"
-
-#ifdef ENABLE_SOCKS
-
-#include "common.h"
-#include "misc.h"
-#include "win32.h"
-#include "socket.h"
-#include "fdmisc.h"
-#include "misc.h"
-#include "proxy.h"
-
-#include "memdbg.h"
-
-#define UP_TYPE_SOCKS "SOCKS Proxy"
-
-void
-socks_adjust_frame_parameters (struct frame *frame, int proto)
-{
- if (proto == PROTO_UDPv4)
- frame_add_to_extra_link (frame, 10);
-}
-
-struct socks_proxy_info *
-socks_proxy_new (const char *server,
- int port,
- const char *authfile,
- bool retry,
- struct auto_proxy_info *auto_proxy_info)
-{
- struct socks_proxy_info *p;
-
- if (auto_proxy_info)
- {
- if (!server)
- {
- if (!auto_proxy_info->socks.server)
- return NULL;
-
- server = auto_proxy_info->socks.server;
- port = auto_proxy_info->socks.port;
- }
- }
-
- ALLOC_OBJ_CLEAR (p, struct socks_proxy_info);
-
- ASSERT (server);
- ASSERT (legal_ipv4_port (port));
-
- strncpynt (p->server, server, sizeof (p->server));
- p->port = port;
-
- if (authfile)
- strncpynt (p->authfile, authfile, sizeof (p->authfile));
- else
- p->authfile[0] = 0;
-
- p->retry = retry;
- p->defined = true;
-
- return p;
-}
-
-void
-socks_proxy_close (struct socks_proxy_info *sp)
-{
- free (sp);
-}
-
-static bool
-socks_username_password_auth (struct socks_proxy_info *p,
- socket_descriptor_t sd,
- volatile int *signal_received)
-{
- char to_send[516];
- char buf[2];
- int len = 0;
- const int timeout_sec = 5;
- struct user_pass creds;
- ssize_t size;
-
- creds.defined = 0;
- get_user_pass (&creds, p->authfile, UP_TYPE_SOCKS, GET_USER_PASS_MANAGEMENT);
-
- if( !creds.username || (strlen(creds.username) > 255)
- || !creds.password || (strlen(creds.password) > 255) ) {
- msg (M_NONFATAL,
- "SOCKS username and/or password exceeds 255 characters. "
- "Authentication not possible.");
- return false;
- }
- openvpn_snprintf (to_send, sizeof (to_send), "\x01%c%s%c%s", (int) strlen(creds.username),
- creds.username, (int) strlen(creds.password), creds.password);
- size = send (sd, to_send, strlen(to_send), MSG_NOSIGNAL);
-
- if (size != strlen (to_send))
- {
- msg (D_LINK_ERRORS | M_ERRNO_SOCK, "socks_username_password_auth: TCP port write failed on send()");
- return false;
- }
-
- while (len < 2)
- {
- int status;
- ssize_t size;
- fd_set reads;
- struct timeval tv;
- char c;
-
- FD_ZERO (&reads);
- FD_SET (sd, &reads);
- tv.tv_sec = timeout_sec;
- tv.tv_usec = 0;
-
- status = select (sd + 1, &reads, NULL, NULL, &tv);
-
- get_signal (signal_received);
- if (*signal_received)
- return false;
-
- /* timeout? */
- if (status == 0)
- {
- msg (D_LINK_ERRORS | M_ERRNO_SOCK, "socks_username_password_auth: TCP port read timeout expired");
- return false;
- }
-
- /* error */
- if (status < 0)
- {
- msg (D_LINK_ERRORS | M_ERRNO_SOCK, "socks_username_password_auth: TCP port read failed on select()");
- return false;
- }
-
- /* read single char */
- size = recv(sd, &c, 1, MSG_NOSIGNAL);
-
- /* error? */
- if (size != 1)
- {
- msg (D_LINK_ERRORS | M_ERRNO_SOCK, "socks_username_password_auth: TCP port read failed on recv()");
- return false;
- }
-
- /* store char in buffer */
- buf[len++] = c;
- }
-
- /* VER = 5, SUCCESS = 0 --> auth success */
- if (buf[0] != 5 && buf[1] != 0)
- {
- msg (D_LINK_ERRORS, "socks_username_password_auth: server refused the authentication");
- return false;
- }
-
- return true;
-}
-
-static bool
-socks_handshake (struct socks_proxy_info *p,
- socket_descriptor_t sd,
- volatile int *signal_received)
-{
- char buf[2];
- int len = 0;
- const int timeout_sec = 5;
-
- /* VER = 5, NMETHODS = 2, METHODS = [0 (no auth), 2 (plain login)] */
- const ssize_t size = send (sd, "\x05\x02\x00\x02", 4, MSG_NOSIGNAL);
- if (size != 4)
- {
- msg (D_LINK_ERRORS | M_ERRNO_SOCK, "socks_handshake: TCP port write failed on send()");
- return false;
- }
-
- while (len < 2)
- {
- int status;
- ssize_t size;
- fd_set reads;
- struct timeval tv;
- char c;
-
- FD_ZERO (&reads);
- FD_SET (sd, &reads);
- tv.tv_sec = timeout_sec;
- tv.tv_usec = 0;
-
- status = select (sd + 1, &reads, NULL, NULL, &tv);
-
- get_signal (signal_received);
- if (*signal_received)
- return false;
-
- /* timeout? */
- if (status == 0)
- {
- msg (D_LINK_ERRORS | M_ERRNO_SOCK, "socks_handshake: TCP port read timeout expired");
- return false;
- }
-
- /* error */
- if (status < 0)
- {
- msg (D_LINK_ERRORS | M_ERRNO_SOCK, "socks_handshake: TCP port read failed on select()");
- return false;
- }
-
- /* read single char */
- size = recv(sd, &c, 1, MSG_NOSIGNAL);
-
- /* error? */
- if (size != 1)
- {
- msg (D_LINK_ERRORS | M_ERRNO_SOCK, "socks_handshake: TCP port read failed on recv()");
- return false;
- }
-
- /* store char in buffer */
- buf[len++] = c;
- }
-
- /* VER == 5 */
- if (buf[0] != '\x05')
- {
- msg (D_LINK_ERRORS, "socks_handshake: Socks proxy returned bad status");
- return false;
- }
-
- /* select the appropriate authentication method */
- switch (buf[1])
- {
- case 0: /* no authentication */
- break;
-
- case 2: /* login/password */
- if (!p->authfile[0])
- {
- msg(D_LINK_ERRORS, "socks_handshake: server asked for username/login auth but we were "
- "not provided any credentials");
- return false;
- }
-
- if (!socks_username_password_auth(p, sd, signal_received))
- return false;
-
- break;
-
- default: /* unknown auth method */
- msg(D_LINK_ERRORS, "socks_handshake: unknown SOCKS auth method");
- return false;
- }
-
- return true;
-}
-
-static bool
-recv_socks_reply (socket_descriptor_t sd,
- struct openvpn_sockaddr *addr,
- volatile int *signal_received)
-{
- char atyp = '\0';
- int alen = 0;
- int len = 0;
- char buf[22];
- const int timeout_sec = 5;
-
- if (addr != NULL)
- {
- addr->sa.sin_family = AF_INET;
- addr->sa.sin_addr.s_addr = htonl (INADDR_ANY);
- addr->sa.sin_port = htons (0);
- }
-
- while (len < 4 + alen + 2)
- {
- int status;
- ssize_t size;
- fd_set reads;
- struct timeval tv;
- char c;
-
- FD_ZERO (&reads);
- FD_SET (sd, &reads);
- tv.tv_sec = timeout_sec;
- tv.tv_usec = 0;
-
- status = select (sd + 1, &reads, NULL, NULL, &tv);
-
- get_signal (signal_received);
- if (*signal_received)
- return false;
-
- /* timeout? */
- if (status == 0)
- {
- msg (D_LINK_ERRORS | M_ERRNO_SOCK, "recv_socks_reply: TCP port read timeout expired");
- return false;
- }
-
- /* error */
- if (status < 0)
- {
- msg (D_LINK_ERRORS | M_ERRNO_SOCK, "recv_socks_reply: TCP port read failed on select()");
- return false;
- }
-
- /* read single char */
- size = recv(sd, &c, 1, MSG_NOSIGNAL);
-
- /* error? */
- if (size != 1)
- {
- msg (D_LINK_ERRORS | M_ERRNO_SOCK, "recv_socks_reply: TCP port read failed on recv()");
- return false;
- }
-
- if (len == 3)
- atyp = c;
-
- if (len == 4)
- {
- switch (atyp)
- {
- case '\x01': /* IP V4 */
- alen = 4;
- break;
-
- case '\x03': /* DOMAINNAME */
- alen = (unsigned char) c;
- break;
-
- case '\x04': /* IP V6 */
- alen = 16;
- break;
-
- default:
- msg (D_LINK_ERRORS, "recv_socks_reply: Socks proxy returned bad address type");
- return false;
- }
- }
-
- /* store char in buffer */
- if (len < (int)sizeof(buf))
- buf[len] = c;
- ++len;
- }
-
- /* VER == 5 && REP == 0 (succeeded) */
- if (buf[0] != '\x05' || buf[1] != '\x00')
- {
- msg (D_LINK_ERRORS, "recv_socks_reply: Socks proxy returned bad reply");
- return false;
- }
-
- /* ATYP == 1 (IP V4 address) */
- if (atyp == '\x01' && addr != NULL)
- {
- memcpy (&addr->sa.sin_addr, buf + 4, sizeof (addr->sa.sin_addr));
- memcpy (&addr->sa.sin_port, buf + 8, sizeof (addr->sa.sin_port));
- }
-
-
- return true;
-}
-
-void
-establish_socks_proxy_passthru (struct socks_proxy_info *p,
- socket_descriptor_t sd, /* already open to proxy */
- const char *host, /* openvpn server remote */
- const int port, /* openvpn server port */
- volatile int *signal_received)
-{
- char buf[128];
- size_t len;
-
- if (!socks_handshake (p, sd, signal_received))
- goto error;
-
- /* format Socks CONNECT message */
- buf[0] = '\x05'; /* VER = 5 */
- buf[1] = '\x01'; /* CMD = 1 (CONNECT) */
- buf[2] = '\x00'; /* RSV */
- buf[3] = '\x03'; /* ATYP = 3 (DOMAINNAME) */
-
- len = strlen(host);
- len = (5 + len + 2 > sizeof(buf)) ? (sizeof(buf) - 5 - 2) : len;
-
- buf[4] = (char) len;
- memcpy(buf + 5, host, len);
-
- buf[5 + len] = (char) (port >> 8);
- buf[5 + len + 1] = (char) (port & 0xff);
-
- {
- const ssize_t size = send (sd, buf, 5 + len + 2, MSG_NOSIGNAL);
- if ((int)size != 5 + (int)len + 2)
- {
- msg (D_LINK_ERRORS | M_ERRNO_SOCK, "establish_socks_proxy_passthru: TCP port write failed on send()");
- goto error;
- }
- }
-
- /* receive reply from Socks proxy and discard */
- if (!recv_socks_reply (sd, NULL, signal_received))
- goto error;
-
- return;
-
- error:
- /* on error, should we exit or restart? */
- if (!*signal_received)
- *signal_received = (p->retry ? SIGUSR1 : SIGTERM); /* SOFT-SIGUSR1 -- socks error */
- return;
-}
-
-void
-establish_socks_proxy_udpassoc (struct socks_proxy_info *p,
- socket_descriptor_t ctrl_sd, /* already open to proxy */
- socket_descriptor_t udp_sd,
- struct openvpn_sockaddr *relay_addr,
- volatile int *signal_received)
-{
- if (!socks_handshake (p, ctrl_sd, signal_received))
- goto error;
-
- {
- /* send Socks UDP ASSOCIATE message */
- /* VER = 5, CMD = 3 (UDP ASSOCIATE), RSV = 0, ATYP = 1 (IP V4),
- BND.ADDR = 0, BND.PORT = 0 */
- const ssize_t size = send (ctrl_sd,
- "\x05\x03\x00\x01\x00\x00\x00\x00\x00\x00",
- 10, MSG_NOSIGNAL);
- if (size != 10)
- {
- msg (D_LINK_ERRORS | M_ERRNO_SOCK, "establish_socks_proxy_passthru: TCP port write failed on send()");
- goto error;
- }
- }
-
- /* receive reply from Socks proxy */
- CLEAR (*relay_addr);
- if (!recv_socks_reply (ctrl_sd, relay_addr, signal_received))
- goto error;
-
- return;
-
- error:
- /* on error, should we exit or restart? */
- if (!*signal_received)
- *signal_received = (p->retry ? SIGUSR1 : SIGTERM); /* SOFT-SIGUSR1 -- socks error */
- return;
-}
-
-/*
- * Remove the 10 byte socks5 header from an incoming
- * UDP packet, setting *from to the source address.
- *
- * Run after UDP read.
- */
-void
-socks_process_incoming_udp (struct buffer *buf,
- struct link_socket_actual *from)
-{
- int atyp;
-
- if (BLEN (buf) < 10)
- goto error;
-
- buf_read_u16 (buf);
- if (buf_read_u8 (buf) != 0)
- goto error;
-
- atyp = buf_read_u8 (buf);
- if (atyp != 1) /* ATYP == 1 (IP V4) */
- goto error;
-
- buf_read (buf, &from->dest.sa.sin_addr, sizeof (from->dest.sa.sin_addr));
- buf_read (buf, &from->dest.sa.sin_port, sizeof (from->dest.sa.sin_port));
-
- return;
-
- error:
- buf->len = 0;
-}
-
-/*
- * Add a 10 byte socks header prior to UDP write.
- * *to is the destination address.
- *
- * Run before UDP write.
- * Returns the size of the header.
- */
-int
-socks_process_outgoing_udp (struct buffer *buf,
- const struct link_socket_actual *to)
-{
- /*
- * Get a 10 byte subset buffer prepended to buf --
- * we expect these bytes will be here because
- * we allocated frame space in socks_adjust_frame_parameters.
- */
- struct buffer head = buf_sub (buf, 10, true);
-
- /* crash if not enough headroom in buf */
- ASSERT (buf_defined (&head));
-
- buf_write_u16 (&head, 0); /* RSV = 0 */
- buf_write_u8 (&head, 0); /* FRAG = 0 */
- buf_write_u8 (&head, '\x01'); /* ATYP = 1 (IP V4) */
- buf_write (&head, &to->dest.sa.sin_addr, sizeof (to->dest.sa.sin_addr));
- buf_write (&head, &to->dest.sa.sin_port, sizeof (to->dest.sa.sin_port));
-
- return 10;
-}
-
-#else
-static void dummy(void) {}
-#endif /* ENABLE_SOCKS */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-09 06:17:31 +0000