693 lines
21 KiB
C
693 lines
21 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* $Id: socks.c,v 1.27 2008-09-29 21:46:04 bagder Exp $
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***************************************************************************/
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#include "setup.h"
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#ifndef CURL_DISABLE_PROXY
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#include <string.h>
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#ifdef NEED_MALLOC_H
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#include <malloc.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#include "urldata.h"
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#include "sendf.h"
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#include "strequal.h"
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#include "select.h"
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#include "connect.h"
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#include "timeval.h"
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#include "socks.h"
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/* The last #include file should be: */
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#include "memdebug.h"
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/*
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* Helper read-from-socket functions. Does the same as Curl_read() but it
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* blocks until all bytes amount of buffersize will be read. No more, no less.
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*
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* This is STUPID BLOCKING behaviour which we frown upon, but right now this
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* is what we have...
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*/
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static int blockread_all(struct connectdata *conn, /* connection data */
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curl_socket_t sockfd, /* read from this socket */
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char *buf, /* store read data here */
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ssize_t buffersize, /* max amount to read */
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ssize_t *n, /* amount bytes read */
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long conn_timeout) /* timeout for data wait
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relative to
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conn->created */
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{
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ssize_t nread;
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ssize_t allread = 0;
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int result;
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struct timeval tvnow;
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long conntime;
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*n = 0;
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do {
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tvnow = Curl_tvnow();
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/* calculating how long connection is establishing */
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conntime = Curl_tvdiff(tvnow, conn->created);
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if(conntime > conn_timeout) {
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/* we already got the timeout */
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result = ~CURLE_OK;
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break;
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}
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if(Curl_socket_ready(sockfd, CURL_SOCKET_BAD,
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(int)(conn_timeout - conntime)) <= 0) {
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result = ~CURLE_OK;
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break;
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}
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result = Curl_read_plain(sockfd, buf, buffersize, &nread);
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if(result)
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break;
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if(buffersize == nread) {
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allread += nread;
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*n = allread;
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result = CURLE_OK;
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break;
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}
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if(!nread) {
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result = ~CURLE_OK;
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break;
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}
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buffersize -= nread;
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buf += nread;
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allread += nread;
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} while(1);
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return result;
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}
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/*
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* This function logs in to a SOCKS4 proxy and sends the specifics to the final
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* destination server.
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*
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* Reference :
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* http://socks.permeo.com/protocol/socks4.protocol
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*
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* Note :
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* Set protocol4a=true for "SOCKS 4A (Simple Extension to SOCKS 4 Protocol)"
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* Nonsupport "Identification Protocol (RFC1413)"
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*/
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CURLcode Curl_SOCKS4(const char *proxy_name,
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const char *hostname,
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int remote_port,
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int sockindex,
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struct connectdata *conn,
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bool protocol4a)
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{
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#define SOCKS4REQLEN 262
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unsigned char socksreq[SOCKS4REQLEN]; /* room for SOCKS4 request incl. user
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id */
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int result;
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CURLcode code;
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curl_socket_t sock = conn->sock[sockindex];
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long timeout;
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struct SessionHandle *data = conn->data;
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/* get timeout */
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timeout = Curl_timeleft(conn, NULL, TRUE);
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if(timeout < 0) {
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/* time-out, bail out, go home */
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failf(data, "Connection time-out");
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return CURLE_OPERATION_TIMEDOUT;
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}
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Curl_nonblock(sock, FALSE);
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/*
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* Compose socks4 request
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*
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* Request format
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*
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* +----+----+----+----+----+----+----+----+----+----+....+----+
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* | VN | CD | DSTPORT | DSTIP | USERID |NULL|
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* +----+----+----+----+----+----+----+----+----+----+....+----+
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* # of bytes: 1 1 2 4 variable 1
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*/
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socksreq[0] = 4; /* version (SOCKS4) */
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socksreq[1] = 1; /* connect */
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*((unsigned short*)&socksreq[2]) = htons((unsigned short)remote_port);
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/* DNS resolve only for SOCKS4, not SOCKS4a */
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if (!protocol4a) {
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struct Curl_dns_entry *dns;
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Curl_addrinfo *hp=NULL;
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int rc;
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rc = Curl_resolv(conn, hostname, remote_port, &dns);
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if(rc == CURLRESOLV_ERROR)
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return CURLE_COULDNT_RESOLVE_PROXY;
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if(rc == CURLRESOLV_PENDING)
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/* this requires that we're in "wait for resolve" state */
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rc = Curl_wait_for_resolv(conn, &dns);
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/*
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* We cannot use 'hostent' as a struct that Curl_resolv() returns. It
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* returns a Curl_addrinfo pointer that may not always look the same.
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*/
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if(dns)
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hp=dns->addr;
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if(hp) {
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char buf[64];
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unsigned short ip[4];
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Curl_printable_address(hp, buf, sizeof(buf));
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if(4 == sscanf( buf, "%hu.%hu.%hu.%hu",
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&ip[0], &ip[1], &ip[2], &ip[3])) {
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/* Set DSTIP */
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socksreq[4] = (unsigned char)ip[0];
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socksreq[5] = (unsigned char)ip[1];
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socksreq[6] = (unsigned char)ip[2];
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socksreq[7] = (unsigned char)ip[3];
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}
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else
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hp = NULL; /* fail! */
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Curl_resolv_unlock(data, dns); /* not used anymore from now on */
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}
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if(!hp) {
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failf(data, "Failed to resolve \"%s\" for SOCKS4 connect.",
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hostname);
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return CURLE_COULDNT_RESOLVE_HOST;
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}
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}
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/*
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* This is currently not supporting "Identification Protocol (RFC1413)".
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*/
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socksreq[8] = 0; /* ensure empty userid is NUL-terminated */
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if(proxy_name)
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strlcat((char*)socksreq + 8, proxy_name, sizeof(socksreq) - 8);
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/*
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* Make connection
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*/
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{
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ssize_t actualread;
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ssize_t written;
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ssize_t hostnamelen = 0;
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int packetsize = 9 +
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(int)strlen((char*)socksreq + 8); /* size including NUL */
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/* If SOCKS4a, set special invalid IP address 0.0.0.x */
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if (protocol4a) {
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socksreq[4] = 0;
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socksreq[5] = 0;
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socksreq[6] = 0;
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socksreq[7] = 1;
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/* If still enough room in buffer, also append hostname */
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hostnamelen = (ssize_t)strlen(hostname) + 1; /* length including NUL */
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if (packetsize + hostnamelen <= SOCKS4REQLEN)
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strcpy((char*)socksreq + packetsize, hostname);
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else
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hostnamelen = 0; /* Flag: hostname did not fit in buffer */
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}
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/* Send request */
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code = Curl_write_plain(conn, sock, (char *)socksreq,
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packetsize + hostnamelen,
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&written);
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if((code != CURLE_OK) || (written != packetsize + hostnamelen)) {
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failf(data, "Failed to send SOCKS4 connect request.");
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return CURLE_COULDNT_CONNECT;
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}
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if (protocol4a && hostnamelen == 0) {
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/* SOCKS4a with very long hostname - send that name separately */
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hostnamelen = (ssize_t)strlen(hostname) + 1;
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code = Curl_write_plain(conn, sock, (char *)hostname, hostnamelen,
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&written);
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if((code != CURLE_OK) || (written != hostnamelen)) {
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failf(data, "Failed to send SOCKS4 connect request.");
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return CURLE_COULDNT_CONNECT;
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}
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}
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packetsize = 8; /* receive data size */
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/* Receive response */
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result = blockread_all(conn, sock, (char *)socksreq, packetsize,
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&actualread, timeout);
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if((result != CURLE_OK) || (actualread != packetsize)) {
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failf(data, "Failed to receive SOCKS4 connect request ack.");
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return CURLE_COULDNT_CONNECT;
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}
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/*
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* Response format
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*
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* +----+----+----+----+----+----+----+----+
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* | VN | CD | DSTPORT | DSTIP |
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* +----+----+----+----+----+----+----+----+
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* # of bytes: 1 1 2 4
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*
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* VN is the version of the reply code and should be 0. CD is the result
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* code with one of the following values:
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*
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* 90: request granted
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* 91: request rejected or failed
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* 92: request rejected because SOCKS server cannot connect to
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* identd on the client
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* 93: request rejected because the client program and identd
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* report different user-ids
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*/
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/* wrong version ? */
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if(socksreq[0] != 0) {
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failf(data,
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"SOCKS4 reply has wrong version, version should be 4.");
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return CURLE_COULDNT_CONNECT;
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}
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/* Result */
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switch(socksreq[1])
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{
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case 90:
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if (protocol4a)
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infof(data, "SOCKS4a request granted.\n");
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else
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infof(data, "SOCKS4 request granted.\n");
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break;
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case 91:
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failf(data,
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"Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
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", request rejected or failed.",
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(unsigned char)socksreq[4], (unsigned char)socksreq[5],
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(unsigned char)socksreq[6], (unsigned char)socksreq[7],
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(unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
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socksreq[1]);
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return CURLE_COULDNT_CONNECT;
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case 92:
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failf(data,
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"Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
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", request rejected because SOCKS server cannot connect to "
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"identd on the client.",
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(unsigned char)socksreq[4], (unsigned char)socksreq[5],
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(unsigned char)socksreq[6], (unsigned char)socksreq[7],
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(unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
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socksreq[1]);
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return CURLE_COULDNT_CONNECT;
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case 93:
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failf(data,
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"Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
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", request rejected because the client program and identd "
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"report different user-ids.",
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(unsigned char)socksreq[4], (unsigned char)socksreq[5],
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(unsigned char)socksreq[6], (unsigned char)socksreq[7],
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(unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
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socksreq[1]);
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return CURLE_COULDNT_CONNECT;
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default:
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failf(data,
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"Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
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", Unknown.",
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(unsigned char)socksreq[4], (unsigned char)socksreq[5],
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(unsigned char)socksreq[6], (unsigned char)socksreq[7],
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(unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
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socksreq[1]);
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return CURLE_COULDNT_CONNECT;
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}
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}
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Curl_nonblock(sock, TRUE);
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return CURLE_OK; /* Proxy was successful! */
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}
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/*
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* This function logs in to a SOCKS5 proxy and sends the specifics to the final
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* destination server.
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*/
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CURLcode Curl_SOCKS5(const char *proxy_name,
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const char *proxy_password,
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const char *hostname,
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int remote_port,
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int sockindex,
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struct connectdata *conn)
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{
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/*
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According to the RFC1928, section "6. Replies". This is what a SOCK5
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replies:
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+----+-----+-------+------+----------+----------+
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|VER | REP | RSV | ATYP | BND.ADDR | BND.PORT |
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+----+-----+-------+------+----------+----------+
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| 1 | 1 | X'00' | 1 | Variable | 2 |
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+----+-----+-------+------+----------+----------+
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Where:
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o VER protocol version: X'05'
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o REP Reply field:
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o X'00' succeeded
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*/
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unsigned char socksreq[600]; /* room for large user/pw (255 max each) */
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ssize_t actualread;
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ssize_t written;
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int result;
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CURLcode code;
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curl_socket_t sock = conn->sock[sockindex];
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struct SessionHandle *data = conn->data;
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long timeout;
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bool socks5_resolve_local = (bool)(data->set.proxytype == CURLPROXY_SOCKS5);
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const size_t hostname_len = strlen(hostname);
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ssize_t packetsize = 0;
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/* RFC1928 chapter 5 specifies max 255 chars for domain name in packet */
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if(!socks5_resolve_local && hostname_len > 255)
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{
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infof(conn->data,"SOCKS5: server resolving disabled for hostnames of "
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"length > 255 [actual len=%d]\n", hostname_len);
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socks5_resolve_local = TRUE;
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}
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/* get timeout */
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timeout = Curl_timeleft(conn, NULL, TRUE);
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if(timeout < 0) {
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/* time-out, bail out, go home */
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failf(data, "Connection time-out");
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return CURLE_OPERATION_TIMEDOUT;
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}
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Curl_nonblock(sock, TRUE);
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/* wait until socket gets connected */
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result = Curl_socket_ready(CURL_SOCKET_BAD, sock, (int)timeout);
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if(-1 == result) {
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failf(conn->data, "SOCKS5: no connection here");
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return CURLE_COULDNT_CONNECT;
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}
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else if(0 == result) {
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failf(conn->data, "SOCKS5: connection timeout");
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return CURLE_OPERATION_TIMEDOUT;
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}
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if(result & CURL_CSELECT_ERR) {
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failf(conn->data, "SOCKS5: error occured during connection");
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return CURLE_COULDNT_CONNECT;
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}
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socksreq[0] = 5; /* version */
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socksreq[1] = (char)(proxy_name ? 2 : 1); /* number of methods (below) */
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socksreq[2] = 0; /* no authentication */
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socksreq[3] = 2; /* username/password */
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Curl_nonblock(sock, FALSE);
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code = Curl_write_plain(conn, sock, (char *)socksreq, (2 + (int)socksreq[1]),
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&written);
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if((code != CURLE_OK) || (written != (2 + (int)socksreq[1]))) {
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failf(data, "Unable to send initial SOCKS5 request.");
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return CURLE_COULDNT_CONNECT;
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}
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Curl_nonblock(sock, TRUE);
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result = Curl_socket_ready(sock, CURL_SOCKET_BAD, (int)timeout);
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if(-1 == result) {
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failf(conn->data, "SOCKS5 nothing to read");
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return CURLE_COULDNT_CONNECT;
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}
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else if(0 == result) {
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failf(conn->data, "SOCKS5 read timeout");
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return CURLE_OPERATION_TIMEDOUT;
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}
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if(result & CURL_CSELECT_ERR) {
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failf(conn->data, "SOCKS5 read error occured");
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return CURLE_RECV_ERROR;
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}
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Curl_nonblock(sock, FALSE);
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result=blockread_all(conn, sock, (char *)socksreq, 2, &actualread, timeout);
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if((result != CURLE_OK) || (actualread != 2)) {
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failf(data, "Unable to receive initial SOCKS5 response.");
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return CURLE_COULDNT_CONNECT;
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}
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if(socksreq[0] != 5) {
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failf(data, "Received invalid version in initial SOCKS5 response.");
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return CURLE_COULDNT_CONNECT;
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}
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if(socksreq[1] == 0) {
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/* Nothing to do, no authentication needed */
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;
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}
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else if(socksreq[1] == 2) {
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/* Needs user name and password */
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size_t userlen, pwlen;
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int len;
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if(proxy_name && proxy_password) {
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userlen = strlen(proxy_name);
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pwlen = strlen(proxy_password);
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}
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else {
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userlen = 0;
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pwlen = 0;
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}
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/* username/password request looks like
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* +----+------+----------+------+----------+
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* |VER | ULEN | UNAME | PLEN | PASSWD |
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* +----+------+----------+------+----------+
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* | 1 | 1 | 1 to 255 | 1 | 1 to 255 |
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* +----+------+----------+------+----------+
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*/
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len = 0;
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socksreq[len++] = 1; /* username/pw subnegotiation version */
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socksreq[len++] = (char) userlen;
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|
memcpy(socksreq + len, proxy_name, (int) userlen);
|
|
len += userlen;
|
|
socksreq[len++] = (char) pwlen;
|
|
memcpy(socksreq + len, proxy_password, (int) pwlen);
|
|
len += pwlen;
|
|
|
|
code = Curl_write_plain(conn, sock, (char *)socksreq, len, &written);
|
|
if((code != CURLE_OK) || (len != written)) {
|
|
failf(data, "Failed to send SOCKS5 sub-negotiation request.");
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
|
|
result=blockread_all(conn, sock, (char *)socksreq, 2, &actualread,
|
|
timeout);
|
|
if((result != CURLE_OK) || (actualread != 2)) {
|
|
failf(data, "Unable to receive SOCKS5 sub-negotiation response.");
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
|
|
/* ignore the first (VER) byte */
|
|
if(socksreq[1] != 0) { /* status */
|
|
failf(data, "User was rejected by the SOCKS5 server (%d %d).",
|
|
socksreq[0], socksreq[1]);
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
|
|
/* Everything is good so far, user was authenticated! */
|
|
}
|
|
else {
|
|
/* error */
|
|
if(socksreq[1] == 1) {
|
|
failf(data,
|
|
"SOCKS5 GSSAPI per-message authentication is not supported.");
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
else if(socksreq[1] == 255) {
|
|
if(!proxy_name || !*proxy_name) {
|
|
failf(data,
|
|
"No authentication method was acceptable. (It is quite likely"
|
|
" that the SOCKS5 server wanted a username/password, since none"
|
|
" was supplied to the server on this connection.)");
|
|
}
|
|
else {
|
|
failf(data, "No authentication method was acceptable.");
|
|
}
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
else {
|
|
failf(data,
|
|
"Undocumented SOCKS5 mode attempted to be used by server.");
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
}
|
|
|
|
/* Authentication is complete, now specify destination to the proxy */
|
|
socksreq[0] = 5; /* version (SOCKS5) */
|
|
socksreq[1] = 1; /* connect */
|
|
socksreq[2] = 0; /* must be zero */
|
|
|
|
if(!socks5_resolve_local) {
|
|
packetsize = (ssize_t)(5 + hostname_len + 2);
|
|
|
|
socksreq[3] = 3; /* ATYP: domain name = 3 */
|
|
socksreq[4] = (char) hostname_len; /* address length */
|
|
memcpy(&socksreq[5], hostname, hostname_len); /* address bytes w/o NULL */
|
|
|
|
*((unsigned short*)&socksreq[hostname_len+5]) =
|
|
htons((unsigned short)remote_port);
|
|
}
|
|
else {
|
|
struct Curl_dns_entry *dns;
|
|
Curl_addrinfo *hp=NULL;
|
|
int rc = Curl_resolv(conn, hostname, remote_port, &dns);
|
|
|
|
packetsize = 10;
|
|
|
|
socksreq[3] = 1; /* IPv4 = 1 */
|
|
|
|
if(rc == CURLRESOLV_ERROR)
|
|
return CURLE_COULDNT_RESOLVE_HOST;
|
|
|
|
if(rc == CURLRESOLV_PENDING)
|
|
/* this requires that we're in "wait for resolve" state */
|
|
rc = Curl_wait_for_resolv(conn, &dns);
|
|
|
|
/*
|
|
* We cannot use 'hostent' as a struct that Curl_resolv() returns. It
|
|
* returns a Curl_addrinfo pointer that may not always look the same.
|
|
*/
|
|
if(dns)
|
|
hp=dns->addr;
|
|
if(hp) {
|
|
char buf[64];
|
|
unsigned short ip[4];
|
|
Curl_printable_address(hp, buf, sizeof(buf));
|
|
|
|
if(4 == sscanf( buf, "%hu.%hu.%hu.%hu",
|
|
&ip[0], &ip[1], &ip[2], &ip[3])) {
|
|
socksreq[4] = (unsigned char)ip[0];
|
|
socksreq[5] = (unsigned char)ip[1];
|
|
socksreq[6] = (unsigned char)ip[2];
|
|
socksreq[7] = (unsigned char)ip[3];
|
|
}
|
|
else
|
|
hp = NULL; /* fail! */
|
|
|
|
Curl_resolv_unlock(data, dns); /* not used anymore from now on */
|
|
}
|
|
if(!hp) {
|
|
failf(data, "Failed to resolve \"%s\" for SOCKS5 connect.",
|
|
hostname);
|
|
return CURLE_COULDNT_RESOLVE_HOST;
|
|
}
|
|
|
|
*((unsigned short*)&socksreq[8]) = htons((unsigned short)remote_port);
|
|
}
|
|
|
|
code = Curl_write_plain(conn, sock, (char *)socksreq, packetsize, &written);
|
|
if((code != CURLE_OK) || (written != packetsize)) {
|
|
failf(data, "Failed to send SOCKS5 connect request.");
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
|
|
packetsize = 10; /* minimum packet size is 10 */
|
|
|
|
result = blockread_all(conn, sock, (char *)socksreq, packetsize,
|
|
&actualread, timeout);
|
|
if((result != CURLE_OK) || (actualread != packetsize)) {
|
|
failf(data, "Failed to receive SOCKS5 connect request ack.");
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
|
|
if(socksreq[0] != 5) { /* version */
|
|
failf(data,
|
|
"SOCKS5 reply has wrong version, version should be 5.");
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
if(socksreq[1] != 0) { /* Anything besides 0 is an error */
|
|
failf(data,
|
|
"Can't complete SOCKS5 connection to %d.%d.%d.%d:%d. (%d)",
|
|
(unsigned char)socksreq[4], (unsigned char)socksreq[5],
|
|
(unsigned char)socksreq[6], (unsigned char)socksreq[7],
|
|
(unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
|
|
socksreq[1]);
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
|
|
/* Fix: in general, returned BND.ADDR is variable length parameter by RFC
|
|
1928, so the reply packet should be read until the end to avoid errors at
|
|
subsequent protocol level.
|
|
|
|
+----+-----+-------+------+----------+----------+
|
|
|VER | REP | RSV | ATYP | BND.ADDR | BND.PORT |
|
|
+----+-----+-------+------+----------+----------+
|
|
| 1 | 1 | X'00' | 1 | Variable | 2 |
|
|
+----+-----+-------+------+----------+----------+
|
|
|
|
ATYP:
|
|
o IP v4 address: X'01', BND.ADDR = 4 byte
|
|
o domain name: X'03', BND.ADDR = [ 1 byte length, string ]
|
|
o IP v6 address: X'04', BND.ADDR = 16 byte
|
|
*/
|
|
|
|
/* Calculate real packet size */
|
|
if(socksreq[3] == 3) {
|
|
/* domain name */
|
|
int addrlen = (int) socksreq[4];
|
|
packetsize = 5 + addrlen + 2;
|
|
}
|
|
else if(socksreq[3] == 4) {
|
|
/* IPv6 */
|
|
packetsize = 4 + 16 + 2;
|
|
}
|
|
|
|
/* At this point we already read first 10 bytes */
|
|
if(packetsize > 10) {
|
|
packetsize -= 10;
|
|
result = blockread_all(conn, sock, (char *)&socksreq[10], packetsize,
|
|
&actualread, timeout);
|
|
if((result != CURLE_OK) || (actualread != packetsize)) {
|
|
failf(data, "Failed to receive SOCKS5 connect request ack.");
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
}
|
|
|
|
Curl_nonblock(sock, TRUE);
|
|
return CURLE_OK; /* Proxy was successful! */
|
|
}
|
|
|
|
#endif /* CURL_DISABLE_PROXY */
|
|
|