1034 lines
32 KiB
C
1034 lines
32 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 - 2021, 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 https://curl.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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***************************************************************************/
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#include "curl_setup.h"
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#if !defined(CURL_DISABLE_PROXY)
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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 "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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#include "multiif.h" /* for getsock macros */
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/* The last 3 #include files should be in this order */
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#include "curl_printf.h"
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#include "curl_memory.h"
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#include "memdebug.h"
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#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
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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 behavior. Only used by the SOCKS GSSAPI functions.
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*/
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int Curl_blockread_all(struct Curl_easy *data, /* transfer */
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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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{
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ssize_t nread = 0;
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ssize_t allread = 0;
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int result;
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*n = 0;
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for(;;) {
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timediff_t timeout_ms = Curl_timeleft(data, NULL, TRUE);
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if(timeout_ms < 0) {
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/* we already got the timeout */
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result = CURLE_OPERATION_TIMEDOUT;
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break;
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}
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if(!timeout_ms)
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timeout_ms = TIMEDIFF_T_MAX;
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if(SOCKET_READABLE(sockfd, timeout_ms) <= 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(CURLE_AGAIN == result)
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continue;
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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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}
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return result;
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}
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#endif
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#if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
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#define DEBUG_AND_VERBOSE
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#define sxstate(x,y) socksstate(x,y, __LINE__)
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#else
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#define sxstate(x,y) socksstate(x,y)
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#endif
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/* always use this function to change state, to make debugging easier */
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static void socksstate(struct Curl_easy *data,
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enum connect_t state
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#ifdef DEBUG_AND_VERBOSE
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, int lineno
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#endif
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)
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{
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struct connectdata *conn = data->conn;
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enum connect_t oldstate = conn->cnnct.state;
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#ifdef DEBUG_AND_VERBOSE
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/* synced with the state list in urldata.h */
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static const char * const statename[] = {
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"INIT",
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"SOCKS_INIT",
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"SOCKS_SEND",
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"SOCKS_READ_INIT",
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"SOCKS_READ",
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"GSSAPI_INIT",
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"AUTH_INIT",
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"AUTH_SEND",
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"AUTH_READ",
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"REQ_INIT",
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"RESOLVING",
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"RESOLVED",
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"RESOLVE_REMOTE",
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"REQ_SEND",
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"REQ_SENDING",
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"REQ_READ",
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"REQ_READ_MORE",
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"DONE"
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};
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#endif
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if(oldstate == state)
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/* don't bother when the new state is the same as the old state */
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return;
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conn->cnnct.state = state;
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#ifdef DEBUG_AND_VERBOSE
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infof(data,
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"SXSTATE: %s => %s conn %p; line %d",
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statename[oldstate], statename[conn->cnnct.state], conn,
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lineno);
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#endif
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}
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int Curl_SOCKS_getsock(struct connectdata *conn, curl_socket_t *sock,
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int sockindex)
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{
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int rc = 0;
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sock[0] = conn->sock[sockindex];
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switch(conn->cnnct.state) {
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case CONNECT_RESOLVING:
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case CONNECT_SOCKS_READ:
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case CONNECT_AUTH_READ:
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case CONNECT_REQ_READ:
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case CONNECT_REQ_READ_MORE:
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rc = GETSOCK_READSOCK(0);
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break;
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default:
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rc = GETSOCK_WRITESOCK(0);
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break;
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}
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return rc;
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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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* https://www.openssh.com/txt/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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CURLproxycode Curl_SOCKS4(const char *proxy_user,
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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 Curl_easy *data,
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bool *done)
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{
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struct connectdata *conn = data->conn;
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const bool protocol4a =
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(conn->socks_proxy.proxytype == CURLPROXY_SOCKS4A) ? TRUE : FALSE;
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unsigned char *socksreq = (unsigned char *)data->state.buffer;
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CURLcode result;
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curl_socket_t sockfd = conn->sock[sockindex];
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struct connstate *sx = &conn->cnnct;
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struct Curl_dns_entry *dns = NULL;
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ssize_t actualread;
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ssize_t written;
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/* make sure that the buffer is at least 600 bytes */
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DEBUGASSERT(READBUFFER_MIN >= 600);
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if(!SOCKS_STATE(sx->state) && !*done)
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sxstate(data, CONNECT_SOCKS_INIT);
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switch(sx->state) {
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case CONNECT_SOCKS_INIT:
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/* SOCKS4 can only do IPv4, insist! */
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conn->ip_version = CURL_IPRESOLVE_V4;
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if(conn->bits.httpproxy)
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infof(data, "SOCKS4%s: connecting to HTTP proxy %s port %d",
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protocol4a ? "a" : "", hostname, remote_port);
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infof(data, "SOCKS4 communication to %s:%d", hostname, remote_port);
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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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socksreq[2] = (unsigned char)((remote_port >> 8) & 0xff); /* PORT MSB */
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socksreq[3] = (unsigned char)(remote_port & 0xff); /* PORT LSB */
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/* DNS resolve only for SOCKS4, not SOCKS4a */
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if(!protocol4a) {
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enum resolve_t rc =
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Curl_resolv(data, hostname, remote_port, FALSE, &dns);
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if(rc == CURLRESOLV_ERROR)
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return CURLPX_RESOLVE_HOST;
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else if(rc == CURLRESOLV_PENDING) {
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sxstate(data, CONNECT_RESOLVING);
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infof(data, "SOCKS4 non-blocking resolve of %s", hostname);
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return CURLPX_OK;
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}
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sxstate(data, CONNECT_RESOLVED);
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goto CONNECT_RESOLVED;
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}
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/* socks4a doesn't resolve anything locally */
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sxstate(data, CONNECT_REQ_INIT);
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goto CONNECT_REQ_INIT;
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case CONNECT_RESOLVING:
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/* check if we have the name resolved by now */
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dns = Curl_fetch_addr(data, hostname, (int)conn->port);
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if(dns) {
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#ifdef CURLRES_ASYNCH
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data->state.async.dns = dns;
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data->state.async.done = TRUE;
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#endif
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infof(data, "Hostname '%s' was found", hostname);
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sxstate(data, CONNECT_RESOLVED);
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}
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else {
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result = Curl_resolv_check(data, &dns);
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if(!dns) {
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if(result)
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return CURLPX_RESOLVE_HOST;
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return CURLPX_OK;
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}
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}
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/* FALLTHROUGH */
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CONNECT_RESOLVED:
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case CONNECT_RESOLVED: {
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struct Curl_addrinfo *hp = NULL;
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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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/* scan for the first IPv4 address */
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while(hp && (hp->ai_family != AF_INET))
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hp = hp->ai_next;
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if(hp) {
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struct sockaddr_in *saddr_in;
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char buf[64];
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Curl_printable_address(hp, buf, sizeof(buf));
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saddr_in = (struct sockaddr_in *)(void *)hp->ai_addr;
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socksreq[4] = ((unsigned char *)&saddr_in->sin_addr.s_addr)[0];
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socksreq[5] = ((unsigned char *)&saddr_in->sin_addr.s_addr)[1];
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socksreq[6] = ((unsigned char *)&saddr_in->sin_addr.s_addr)[2];
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socksreq[7] = ((unsigned char *)&saddr_in->sin_addr.s_addr)[3];
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infof(data, "SOCKS4 connect to IPv4 %s (locally resolved)", buf);
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Curl_resolv_unlock(data, dns); /* not used anymore from now on */
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}
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else
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failf(data, "SOCKS4 connection to %s not supported", hostname);
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}
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else
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failf(data, "Failed to resolve \"%s\" for SOCKS4 connect.",
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hostname);
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if(!hp)
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return CURLPX_RESOLVE_HOST;
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}
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/* FALLTHROUGH */
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CONNECT_REQ_INIT:
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case CONNECT_REQ_INIT:
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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_user) {
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size_t plen = strlen(proxy_user);
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if(plen >= (size_t)data->set.buffer_size - 8) {
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failf(data, "Too long SOCKS proxy user name, can't use!");
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return CURLPX_LONG_USER;
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}
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/* copy the proxy name WITH trailing zero */
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memcpy(socksreq + 8, proxy_user, plen + 1);
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}
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/*
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* Make connection
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*/
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{
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size_t packetsize = 9 +
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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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size_t hostnamelen = 0;
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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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/* append hostname */
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hostnamelen = strlen(hostname) + 1; /* length including NUL */
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if(hostnamelen <= 255)
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strcpy((char *)socksreq + packetsize, hostname);
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else {
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failf(data, "SOCKS4: too long host name");
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return CURLPX_LONG_HOSTNAME;
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}
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packetsize += hostnamelen;
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}
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sx->outp = socksreq;
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sx->outstanding = packetsize;
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sxstate(data, CONNECT_REQ_SENDING);
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}
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/* FALLTHROUGH */
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case CONNECT_REQ_SENDING:
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/* Send request */
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result = Curl_write_plain(data, sockfd, (char *)sx->outp,
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sx->outstanding, &written);
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if(result && (CURLE_AGAIN != result)) {
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failf(data, "Failed to send SOCKS4 connect request.");
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return CURLPX_SEND_CONNECT;
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}
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if(written != sx->outstanding) {
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/* not done, remain in state */
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sx->outstanding -= written;
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sx->outp += written;
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return CURLPX_OK;
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}
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/* done sending! */
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sx->outstanding = 8; /* receive data size */
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sx->outp = socksreq;
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sxstate(data, CONNECT_SOCKS_READ);
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/* FALLTHROUGH */
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case CONNECT_SOCKS_READ:
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/* Receive response */
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result = Curl_read_plain(sockfd, (char *)sx->outp,
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sx->outstanding, &actualread);
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if(result && (CURLE_AGAIN != result)) {
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failf(data, "SOCKS4: Failed receiving connect request ack: %s",
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curl_easy_strerror(result));
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return CURLPX_RECV_CONNECT;
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}
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else if(!result && !actualread) {
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/* connection closed */
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failf(data, "connection to proxy closed");
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return CURLPX_CLOSED;
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}
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else if(actualread != sx->outstanding) {
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/* remain in reading state */
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sx->outstanding -= actualread;
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sx->outp += actualread;
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return CURLPX_OK;
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}
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sxstate(data, CONNECT_DONE);
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break;
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default: /* lots of unused states in SOCKS4 */
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break;
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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]) {
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failf(data,
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"SOCKS4 reply has wrong version, version should be 0.");
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return CURLPX_BAD_VERSION;
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}
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/* Result */
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switch(socksreq[1]) {
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case 90:
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infof(data, "SOCKS4%s request granted.", protocol4a?"a":"");
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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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socksreq[4], socksreq[5], socksreq[6], socksreq[7],
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(((unsigned char)socksreq[2] << 8) | (unsigned char)socksreq[3]),
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(unsigned char)socksreq[1]);
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return CURLPX_REQUEST_FAILED;
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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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socksreq[4], socksreq[5], socksreq[6], socksreq[7],
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(((unsigned char)socksreq[2] << 8) | (unsigned char)socksreq[3]),
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(unsigned char)socksreq[1]);
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return CURLPX_IDENTD;
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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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socksreq[4], socksreq[5], socksreq[6], socksreq[7],
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(((unsigned char)socksreq[2] << 8) | (unsigned char)socksreq[3]),
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(unsigned char)socksreq[1]);
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return CURLPX_IDENTD_DIFFER;
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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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socksreq[4], socksreq[5], socksreq[6], socksreq[7],
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(((unsigned char)socksreq[2] << 8) | (unsigned char)socksreq[3]),
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(unsigned char)socksreq[1]);
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return CURLPX_UNKNOWN_FAIL;
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}
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*done = TRUE;
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return CURLPX_OK; /* Proxy was successful! */
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}
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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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CURLproxycode Curl_SOCKS5(const char *proxy_user,
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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 Curl_easy *data,
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bool *done)
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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 |
|
|
+----+-----+-------+------+----------+----------+
|
|
|
|
Where:
|
|
|
|
o VER protocol version: X'05'
|
|
o REP Reply field:
|
|
o X'00' succeeded
|
|
*/
|
|
struct connectdata *conn = data->conn;
|
|
unsigned char *socksreq = (unsigned char *)data->state.buffer;
|
|
char dest[256] = "unknown"; /* printable hostname:port */
|
|
int idx;
|
|
ssize_t actualread;
|
|
ssize_t written;
|
|
CURLcode result;
|
|
curl_socket_t sockfd = conn->sock[sockindex];
|
|
bool socks5_resolve_local =
|
|
(conn->socks_proxy.proxytype == CURLPROXY_SOCKS5) ? TRUE : FALSE;
|
|
const size_t hostname_len = strlen(hostname);
|
|
ssize_t len = 0;
|
|
const unsigned long auth = data->set.socks5auth;
|
|
bool allow_gssapi = FALSE;
|
|
struct connstate *sx = &conn->cnnct;
|
|
struct Curl_dns_entry *dns = NULL;
|
|
|
|
if(!SOCKS_STATE(sx->state) && !*done)
|
|
sxstate(data, CONNECT_SOCKS_INIT);
|
|
|
|
switch(sx->state) {
|
|
case CONNECT_SOCKS_INIT:
|
|
if(conn->bits.httpproxy)
|
|
infof(data, "SOCKS5: connecting to HTTP proxy %s port %d",
|
|
hostname, remote_port);
|
|
|
|
/* RFC1928 chapter 5 specifies max 255 chars for domain name in packet */
|
|
if(!socks5_resolve_local && hostname_len > 255) {
|
|
infof(data, "SOCKS5: server resolving disabled for hostnames of "
|
|
"length > 255 [actual len=%zu]", hostname_len);
|
|
socks5_resolve_local = TRUE;
|
|
}
|
|
|
|
if(auth & ~(CURLAUTH_BASIC | CURLAUTH_GSSAPI))
|
|
infof(data,
|
|
"warning: unsupported value passed to CURLOPT_SOCKS5_AUTH: %lu",
|
|
auth);
|
|
if(!(auth & CURLAUTH_BASIC))
|
|
/* disable username/password auth */
|
|
proxy_user = NULL;
|
|
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
|
|
if(auth & CURLAUTH_GSSAPI)
|
|
allow_gssapi = TRUE;
|
|
#endif
|
|
|
|
idx = 0;
|
|
socksreq[idx++] = 5; /* version */
|
|
idx++; /* number of authentication methods */
|
|
socksreq[idx++] = 0; /* no authentication */
|
|
if(allow_gssapi)
|
|
socksreq[idx++] = 1; /* GSS-API */
|
|
if(proxy_user)
|
|
socksreq[idx++] = 2; /* username/password */
|
|
/* write the number of authentication methods */
|
|
socksreq[1] = (unsigned char) (idx - 2);
|
|
|
|
result = Curl_write_plain(data, sockfd, (char *)socksreq, idx, &written);
|
|
if(result && (CURLE_AGAIN != result)) {
|
|
failf(data, "Unable to send initial SOCKS5 request.");
|
|
return CURLPX_SEND_CONNECT;
|
|
}
|
|
if(written != idx) {
|
|
sxstate(data, CONNECT_SOCKS_SEND);
|
|
sx->outstanding = idx - written;
|
|
sx->outp = &socksreq[written];
|
|
return CURLPX_OK;
|
|
}
|
|
sxstate(data, CONNECT_SOCKS_READ);
|
|
goto CONNECT_SOCKS_READ_INIT;
|
|
case CONNECT_SOCKS_SEND:
|
|
result = Curl_write_plain(data, sockfd, (char *)sx->outp,
|
|
sx->outstanding, &written);
|
|
if(result && (CURLE_AGAIN != result)) {
|
|
failf(data, "Unable to send initial SOCKS5 request.");
|
|
return CURLPX_SEND_CONNECT;
|
|
}
|
|
if(written != sx->outstanding) {
|
|
/* not done, remain in state */
|
|
sx->outstanding -= written;
|
|
sx->outp += written;
|
|
return CURLPX_OK;
|
|
}
|
|
/* FALLTHROUGH */
|
|
CONNECT_SOCKS_READ_INIT:
|
|
case CONNECT_SOCKS_READ_INIT:
|
|
sx->outstanding = 2; /* expect two bytes */
|
|
sx->outp = socksreq; /* store it here */
|
|
/* FALLTHROUGH */
|
|
case CONNECT_SOCKS_READ:
|
|
result = Curl_read_plain(sockfd, (char *)sx->outp,
|
|
sx->outstanding, &actualread);
|
|
if(result && (CURLE_AGAIN != result)) {
|
|
failf(data, "Unable to receive initial SOCKS5 response.");
|
|
return CURLPX_RECV_CONNECT;
|
|
}
|
|
else if(!result && !actualread) {
|
|
/* connection closed */
|
|
failf(data, "Connection to proxy closed");
|
|
return CURLPX_CLOSED;
|
|
}
|
|
else if(actualread != sx->outstanding) {
|
|
/* remain in reading state */
|
|
sx->outstanding -= actualread;
|
|
sx->outp += actualread;
|
|
return CURLPX_OK;
|
|
}
|
|
else if(socksreq[0] != 5) {
|
|
failf(data, "Received invalid version in initial SOCKS5 response.");
|
|
return CURLPX_BAD_VERSION;
|
|
}
|
|
else if(socksreq[1] == 0) {
|
|
/* DONE! No authentication needed. Send request. */
|
|
sxstate(data, CONNECT_REQ_INIT);
|
|
goto CONNECT_REQ_INIT;
|
|
}
|
|
else if(socksreq[1] == 2) {
|
|
/* regular name + password authentication */
|
|
sxstate(data, CONNECT_AUTH_INIT);
|
|
goto CONNECT_AUTH_INIT;
|
|
}
|
|
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
|
|
else if(allow_gssapi && (socksreq[1] == 1)) {
|
|
sxstate(data, CONNECT_GSSAPI_INIT);
|
|
result = Curl_SOCKS5_gssapi_negotiate(sockindex, data);
|
|
if(result) {
|
|
failf(data, "Unable to negotiate SOCKS5 GSS-API context.");
|
|
return CURLPX_GSSAPI;
|
|
}
|
|
}
|
|
#endif
|
|
else {
|
|
/* error */
|
|
if(!allow_gssapi && (socksreq[1] == 1)) {
|
|
failf(data,
|
|
"SOCKS5 GSSAPI per-message authentication is not supported.");
|
|
return CURLPX_GSSAPI_PERMSG;
|
|
}
|
|
else if(socksreq[1] == 255) {
|
|
failf(data, "No authentication method was acceptable.");
|
|
return CURLPX_NO_AUTH;
|
|
}
|
|
}
|
|
failf(data,
|
|
"Undocumented SOCKS5 mode attempted to be used by server.");
|
|
return CURLPX_UNKNOWN_MODE;
|
|
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
|
|
case CONNECT_GSSAPI_INIT:
|
|
/* GSSAPI stuff done non-blocking */
|
|
break;
|
|
#endif
|
|
|
|
default: /* do nothing! */
|
|
break;
|
|
|
|
CONNECT_AUTH_INIT:
|
|
case CONNECT_AUTH_INIT: {
|
|
/* Needs user name and password */
|
|
size_t proxy_user_len, proxy_password_len;
|
|
if(proxy_user && proxy_password) {
|
|
proxy_user_len = strlen(proxy_user);
|
|
proxy_password_len = strlen(proxy_password);
|
|
}
|
|
else {
|
|
proxy_user_len = 0;
|
|
proxy_password_len = 0;
|
|
}
|
|
|
|
/* username/password request looks like
|
|
* +----+------+----------+------+----------+
|
|
* |VER | ULEN | UNAME | PLEN | PASSWD |
|
|
* +----+------+----------+------+----------+
|
|
* | 1 | 1 | 1 to 255 | 1 | 1 to 255 |
|
|
* +----+------+----------+------+----------+
|
|
*/
|
|
len = 0;
|
|
socksreq[len++] = 1; /* username/pw subnegotiation version */
|
|
socksreq[len++] = (unsigned char) proxy_user_len;
|
|
if(proxy_user && proxy_user_len) {
|
|
/* the length must fit in a single byte */
|
|
if(proxy_user_len >= 255) {
|
|
failf(data, "Excessive user name length for proxy auth");
|
|
return CURLPX_LONG_USER;
|
|
}
|
|
memcpy(socksreq + len, proxy_user, proxy_user_len);
|
|
}
|
|
len += proxy_user_len;
|
|
socksreq[len++] = (unsigned char) proxy_password_len;
|
|
if(proxy_password && proxy_password_len) {
|
|
/* the length must fit in a single byte */
|
|
if(proxy_password_len > 255) {
|
|
failf(data, "Excessive password length for proxy auth");
|
|
return CURLPX_LONG_PASSWD;
|
|
}
|
|
memcpy(socksreq + len, proxy_password, proxy_password_len);
|
|
}
|
|
len += proxy_password_len;
|
|
sxstate(data, CONNECT_AUTH_SEND);
|
|
sx->outstanding = len;
|
|
sx->outp = socksreq;
|
|
}
|
|
/* FALLTHROUGH */
|
|
case CONNECT_AUTH_SEND:
|
|
result = Curl_write_plain(data, sockfd, (char *)sx->outp,
|
|
sx->outstanding, &written);
|
|
if(result && (CURLE_AGAIN != result)) {
|
|
failf(data, "Failed to send SOCKS5 sub-negotiation request.");
|
|
return CURLPX_SEND_AUTH;
|
|
}
|
|
if(sx->outstanding != written) {
|
|
/* remain in state */
|
|
sx->outstanding -= written;
|
|
sx->outp += written;
|
|
return CURLPX_OK;
|
|
}
|
|
sx->outp = socksreq;
|
|
sx->outstanding = 2;
|
|
sxstate(data, CONNECT_AUTH_READ);
|
|
/* FALLTHROUGH */
|
|
case CONNECT_AUTH_READ:
|
|
result = Curl_read_plain(sockfd, (char *)sx->outp,
|
|
sx->outstanding, &actualread);
|
|
if(result && (CURLE_AGAIN != result)) {
|
|
failf(data, "Unable to receive SOCKS5 sub-negotiation response.");
|
|
return CURLPX_RECV_AUTH;
|
|
}
|
|
else if(!result && !actualread) {
|
|
/* connection closed */
|
|
failf(data, "connection to proxy closed");
|
|
return CURLPX_CLOSED;
|
|
}
|
|
else if(actualread != sx->outstanding) {
|
|
/* remain in state */
|
|
sx->outstanding -= actualread;
|
|
sx->outp += actualread;
|
|
return CURLPX_OK;
|
|
}
|
|
/* ignore the first (VER) byte */
|
|
else if(socksreq[1]) { /* status */
|
|
failf(data, "User was rejected by the SOCKS5 server (%d %d).",
|
|
socksreq[0], socksreq[1]);
|
|
return CURLPX_USER_REJECTED;
|
|
}
|
|
|
|
/* Everything is good so far, user was authenticated! */
|
|
sxstate(data, CONNECT_REQ_INIT);
|
|
/* FALLTHROUGH */
|
|
CONNECT_REQ_INIT:
|
|
case CONNECT_REQ_INIT:
|
|
if(socks5_resolve_local) {
|
|
enum resolve_t rc = Curl_resolv(data, hostname, remote_port,
|
|
FALSE, &dns);
|
|
|
|
if(rc == CURLRESOLV_ERROR)
|
|
return CURLPX_RESOLVE_HOST;
|
|
|
|
if(rc == CURLRESOLV_PENDING) {
|
|
sxstate(data, CONNECT_RESOLVING);
|
|
return CURLPX_OK;
|
|
}
|
|
sxstate(data, CONNECT_RESOLVED);
|
|
goto CONNECT_RESOLVED;
|
|
}
|
|
goto CONNECT_RESOLVE_REMOTE;
|
|
|
|
case CONNECT_RESOLVING:
|
|
/* check if we have the name resolved by now */
|
|
dns = Curl_fetch_addr(data, hostname, remote_port);
|
|
|
|
if(dns) {
|
|
#ifdef CURLRES_ASYNCH
|
|
data->state.async.dns = dns;
|
|
data->state.async.done = TRUE;
|
|
#endif
|
|
infof(data, "SOCKS5: hostname '%s' found", hostname);
|
|
}
|
|
|
|
if(!dns) {
|
|
result = Curl_resolv_check(data, &dns);
|
|
if(!dns) {
|
|
if(result)
|
|
return CURLPX_RESOLVE_HOST;
|
|
return CURLPX_OK;
|
|
}
|
|
}
|
|
/* FALLTHROUGH */
|
|
CONNECT_RESOLVED:
|
|
case CONNECT_RESOLVED: {
|
|
struct Curl_addrinfo *hp = NULL;
|
|
size_t destlen;
|
|
if(dns)
|
|
hp = dns->addr;
|
|
if(!hp) {
|
|
failf(data, "Failed to resolve \"%s\" for SOCKS5 connect.",
|
|
hostname);
|
|
return CURLPX_RESOLVE_HOST;
|
|
}
|
|
|
|
Curl_printable_address(hp, dest, sizeof(dest));
|
|
destlen = strlen(dest);
|
|
msnprintf(dest + destlen, sizeof(dest) - destlen, ":%d", remote_port);
|
|
|
|
len = 0;
|
|
socksreq[len++] = 5; /* version (SOCKS5) */
|
|
socksreq[len++] = 1; /* connect */
|
|
socksreq[len++] = 0; /* must be zero */
|
|
if(hp->ai_family == AF_INET) {
|
|
int i;
|
|
struct sockaddr_in *saddr_in;
|
|
socksreq[len++] = 1; /* ATYP: IPv4 = 1 */
|
|
|
|
saddr_in = (struct sockaddr_in *)(void *)hp->ai_addr;
|
|
for(i = 0; i < 4; i++) {
|
|
socksreq[len++] = ((unsigned char *)&saddr_in->sin_addr.s_addr)[i];
|
|
}
|
|
|
|
infof(data, "SOCKS5 connect to IPv4 %s (locally resolved)", dest);
|
|
}
|
|
#ifdef ENABLE_IPV6
|
|
else if(hp->ai_family == AF_INET6) {
|
|
int i;
|
|
struct sockaddr_in6 *saddr_in6;
|
|
socksreq[len++] = 4; /* ATYP: IPv6 = 4 */
|
|
|
|
saddr_in6 = (struct sockaddr_in6 *)(void *)hp->ai_addr;
|
|
for(i = 0; i < 16; i++) {
|
|
socksreq[len++] =
|
|
((unsigned char *)&saddr_in6->sin6_addr.s6_addr)[i];
|
|
}
|
|
|
|
infof(data, "SOCKS5 connect to IPv6 %s (locally resolved)", dest);
|
|
}
|
|
#endif
|
|
else {
|
|
hp = NULL; /* fail! */
|
|
failf(data, "SOCKS5 connection to %s not supported", dest);
|
|
}
|
|
|
|
Curl_resolv_unlock(data, dns); /* not used anymore from now on */
|
|
goto CONNECT_REQ_SEND;
|
|
}
|
|
CONNECT_RESOLVE_REMOTE:
|
|
case CONNECT_RESOLVE_REMOTE:
|
|
/* Authentication is complete, now specify destination to the proxy */
|
|
len = 0;
|
|
socksreq[len++] = 5; /* version (SOCKS5) */
|
|
socksreq[len++] = 1; /* connect */
|
|
socksreq[len++] = 0; /* must be zero */
|
|
|
|
if(!socks5_resolve_local) {
|
|
socksreq[len++] = 3; /* ATYP: domain name = 3 */
|
|
socksreq[len++] = (char) hostname_len; /* one byte address length */
|
|
memcpy(&socksreq[len], hostname, hostname_len); /* address w/o NULL */
|
|
len += hostname_len;
|
|
infof(data, "SOCKS5 connect to %s:%d (remotely resolved)",
|
|
hostname, remote_port);
|
|
}
|
|
/* FALLTHROUGH */
|
|
|
|
CONNECT_REQ_SEND:
|
|
case CONNECT_REQ_SEND:
|
|
/* PORT MSB */
|
|
socksreq[len++] = (unsigned char)((remote_port >> 8) & 0xff);
|
|
/* PORT LSB */
|
|
socksreq[len++] = (unsigned char)(remote_port & 0xff);
|
|
|
|
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
|
|
if(conn->socks5_gssapi_enctype) {
|
|
failf(data, "SOCKS5 GSS-API protection not yet implemented.");
|
|
return CURLPX_GSSAPI_PROTECTION;
|
|
}
|
|
#endif
|
|
sx->outp = socksreq;
|
|
sx->outstanding = len;
|
|
sxstate(data, CONNECT_REQ_SENDING);
|
|
/* FALLTHROUGH */
|
|
case CONNECT_REQ_SENDING:
|
|
result = Curl_write_plain(data, sockfd, (char *)sx->outp,
|
|
sx->outstanding, &written);
|
|
if(result && (CURLE_AGAIN != result)) {
|
|
failf(data, "Failed to send SOCKS5 connect request.");
|
|
return CURLPX_SEND_REQUEST;
|
|
}
|
|
if(sx->outstanding != written) {
|
|
/* remain in state */
|
|
sx->outstanding -= written;
|
|
sx->outp += written;
|
|
return CURLPX_OK;
|
|
}
|
|
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
|
|
if(conn->socks5_gssapi_enctype) {
|
|
failf(data, "SOCKS5 GSS-API protection not yet implemented.");
|
|
return CURLPX_GSSAPI_PROTECTION;
|
|
}
|
|
#endif
|
|
sx->outstanding = 10; /* minimum packet size is 10 */
|
|
sx->outp = socksreq;
|
|
sxstate(data, CONNECT_REQ_READ);
|
|
/* FALLTHROUGH */
|
|
case CONNECT_REQ_READ:
|
|
result = Curl_read_plain(sockfd, (char *)sx->outp,
|
|
sx->outstanding, &actualread);
|
|
if(result && (CURLE_AGAIN != result)) {
|
|
failf(data, "Failed to receive SOCKS5 connect request ack.");
|
|
return CURLPX_RECV_REQACK;
|
|
}
|
|
else if(!result && !actualread) {
|
|
/* connection closed */
|
|
failf(data, "connection to proxy closed");
|
|
return CURLPX_CLOSED;
|
|
}
|
|
else if(actualread != sx->outstanding) {
|
|
/* remain in state */
|
|
sx->outstanding -= actualread;
|
|
sx->outp += actualread;
|
|
return CURLPX_OK;
|
|
}
|
|
|
|
if(socksreq[0] != 5) { /* version */
|
|
failf(data,
|
|
"SOCKS5 reply has wrong version, version should be 5.");
|
|
return CURLPX_BAD_VERSION;
|
|
}
|
|
else if(socksreq[1]) { /* Anything besides 0 is an error */
|
|
CURLproxycode rc = CURLPX_REPLY_UNASSIGNED;
|
|
int code = socksreq[1];
|
|
failf(data, "Can't complete SOCKS5 connection to %s. (%d)",
|
|
hostname, (unsigned char)socksreq[1]);
|
|
if(code < 9) {
|
|
/* RFC 1928 section 6 lists: */
|
|
static const CURLproxycode lookup[] = {
|
|
CURLPX_OK,
|
|
CURLPX_REPLY_GENERAL_SERVER_FAILURE,
|
|
CURLPX_REPLY_NOT_ALLOWED,
|
|
CURLPX_REPLY_NETWORK_UNREACHABLE,
|
|
CURLPX_REPLY_HOST_UNREACHABLE,
|
|
CURLPX_REPLY_CONNECTION_REFUSED,
|
|
CURLPX_REPLY_TTL_EXPIRED,
|
|
CURLPX_REPLY_COMMAND_NOT_SUPPORTED,
|
|
CURLPX_REPLY_ADDRESS_TYPE_NOT_SUPPORTED,
|
|
};
|
|
rc = lookup[code];
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/* 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];
|
|
len = 5 + addrlen + 2;
|
|
}
|
|
else if(socksreq[3] == 4) {
|
|
/* IPv6 */
|
|
len = 4 + 16 + 2;
|
|
}
|
|
else if(socksreq[3] == 1) {
|
|
len = 4 + 4 + 2;
|
|
}
|
|
else {
|
|
failf(data, "SOCKS5 reply has wrong address type.");
|
|
return CURLPX_BAD_ADDRESS_TYPE;
|
|
}
|
|
|
|
/* At this point we already read first 10 bytes */
|
|
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
|
|
if(!conn->socks5_gssapi_enctype) {
|
|
/* decrypt_gssapi_blockread already read the whole packet */
|
|
#endif
|
|
if(len > 10) {
|
|
sx->outstanding = len - 10; /* get the rest */
|
|
sx->outp = &socksreq[10];
|
|
sxstate(data, CONNECT_REQ_READ_MORE);
|
|
}
|
|
else {
|
|
sxstate(data, CONNECT_DONE);
|
|
break;
|
|
}
|
|
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
|
|
}
|
|
#endif
|
|
/* FALLTHROUGH */
|
|
case CONNECT_REQ_READ_MORE:
|
|
result = Curl_read_plain(sockfd, (char *)sx->outp,
|
|
sx->outstanding, &actualread);
|
|
if(result && (CURLE_AGAIN != result)) {
|
|
failf(data, "Failed to receive SOCKS5 connect request ack.");
|
|
return CURLPX_RECV_ADDRESS;
|
|
}
|
|
else if(!result && !actualread) {
|
|
/* connection closed */
|
|
failf(data, "connection to proxy closed");
|
|
return CURLPX_CLOSED;
|
|
}
|
|
else if(actualread != sx->outstanding) {
|
|
/* remain in state */
|
|
sx->outstanding -= actualread;
|
|
sx->outp += actualread;
|
|
return CURLPX_OK;
|
|
}
|
|
sxstate(data, CONNECT_DONE);
|
|
}
|
|
infof(data, "SOCKS5 request granted.");
|
|
|
|
*done = TRUE;
|
|
return CURLPX_OK; /* Proxy was successful! */
|
|
}
|
|
|
|
#endif /* CURL_DISABLE_PROXY */
|