diff options
Diffstat (limited to 'main/openvpn/src/openvpn/socks.c')
m--------- | main/openvpn | 0 | ||||
-rw-r--r-- | main/openvpn/src/openvpn/socks.c | 574 |
2 files changed, 0 insertions, 574 deletions
diff --git a/main/openvpn b/main/openvpn new file mode 160000 +Subproject 7aaf01766f9718375986600216607aeb6397200 diff --git a/main/openvpn/src/openvpn/socks.c b/main/openvpn/src/openvpn/socks.c deleted file mode 100644 index 72bdf550..00000000 --- a/main/openvpn/src/openvpn/socks.c +++ /dev/null @@ -1,574 +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>) - */ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#elif defined(_MSC_VER) -#include "config-msvc.h" -#endif - -#include "syshead.h" - -#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_UDP) - frame_add_to_extra_link (frame, 10); -} - -struct socks_proxy_info * -socks_proxy_new (const char *server, - const char *port, - const char *authfile, - bool retry) -{ - struct socks_proxy_info *p; - - ALLOC_OBJ_CLEAR (p, struct socks_proxy_info); - - ASSERT (server); - ASSERT (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, "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, "socks_username_password_auth: TCP port read timeout expired"); - return false; - } - - /* error */ - if (status < 0) - { - msg (D_LINK_ERRORS | M_ERRNO, "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, "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; - ssize_t size; - - /* VER = 5, NMETHODS = 1, METHODS = [0 (no auth)] */ - char method_sel[3] = { 0x05, 0x01, 0x00 }; - if (p->authfile[0]) - method_sel[2] = 0x02; /* METHODS = [2 (plain login)] */ - - size = send (sd, method_sel, sizeof (method_sel), MSG_NOSIGNAL); - if (size != sizeof (method_sel)) - { - msg (D_LINK_ERRORS | M_ERRNO, "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, "socks_handshake: TCP port read timeout expired"); - return false; - } - - /* error */ - if (status < 0) - { - msg (D_LINK_ERRORS | M_ERRNO, "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, "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; - } - - /* validate that the auth method returned is the one sent */ - if (buf[1] != method_sel[2]) - { - msg (D_LINK_ERRORS, "socks_handshake: Socks proxy returned unexpected auth"); - 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->addr.in4.sin_family = AF_INET; - addr->addr.in4.sin_addr.s_addr = htonl (INADDR_ANY); - addr->addr.in4.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, "recv_socks_reply: TCP port read timeout expired"); - return false; - } - - /* error */ - if (status < 0) - { - msg (D_LINK_ERRORS | M_ERRNO, "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, "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->addr.in4.sin_addr, buf + 4, sizeof (addr->addr.in4.sin_addr)); - memcpy (&addr->addr.in4.sin_port, buf + 8, sizeof (addr->addr.in4.sin_port)); - } - - - return true; -} - -static int -port_from_servname(const char* servname) -{ - int port =0; - port = atoi(servname); - if(port >0 && port < 65536) - return port; - - struct servent* service; - service = getservbyname(servname, NULL); - if(service) - return service->s_port; - - return 0; -} - -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 char *servname, /* 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); - - int port = port_from_servname (servname); - if (port ==0) - { - msg (D_LINK_ERRORS, "establish_socks_proxy_passthrough: Cannot convert %s to port number", servname); - goto error; - } - - 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, "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, "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.addr.in4.sin_addr, sizeof (from->dest.addr.in4.sin_addr)); - buf_read (buf, &from->dest.addr.in4.sin_port, sizeof (from->dest.addr.in4.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.addr.in4.sin_addr, sizeof (to->dest.addr.in4.sin_addr)); - buf_write (&head, &to->dest.addr.in4.sin_port, sizeof (to->dest.addr.in4.sin_port)); - - return 10; -} |