[337] | 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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| 9 | *
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| 10 | * This software is licensed as described in the file COPYING, which
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| 11 | * you should have received as part of this distribution. The terms
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| 12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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| 13 | *
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| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 15 | * copies of the Software, and permit persons to whom the Software is
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| 16 | * furnished to do so, under the terms of the COPYING file.
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| 17 | *
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| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 19 | * KIND, either express or implied.
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| 20 | *
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| 21 | ***************************************************************************/
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| 22 |
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| 23 | #include "curl_setup.h"
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| 24 |
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| 25 | #if !defined(CURL_DISABLE_PROXY)
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| 26 |
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| 27 | #ifdef HAVE_NETINET_IN_H
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| 28 | #include <netinet/in.h>
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| 29 | #endif
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| 30 | #ifdef HAVE_ARPA_INET_H
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| 31 | #include <arpa/inet.h>
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| 32 | #endif
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| 33 |
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| 34 | #include "urldata.h"
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| 35 | #include "sendf.h"
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| 36 | #include "select.h"
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| 37 | #include "connect.h"
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| 38 | #include "timeval.h"
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| 39 | #include "socks.h"
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| 40 |
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| 41 | /* The last #include file should be: */
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| 42 | #include "memdebug.h"
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| 43 |
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| 44 | /*
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| 45 | * Helper read-from-socket functions. Does the same as Curl_read() but it
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| 46 | * blocks until all bytes amount of buffersize will be read. No more, no less.
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| 47 | *
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| 48 | * This is STUPID BLOCKING behaviour which we frown upon, but right now this
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| 49 | * is what we have...
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| 50 | */
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| 51 | int Curl_blockread_all(struct connectdata *conn, /* connection data */
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| 52 | curl_socket_t sockfd, /* read from this socket */
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| 53 | char *buf, /* store read data here */
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| 54 | ssize_t buffersize, /* max amount to read */
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| 55 | ssize_t *n) /* amount bytes read */
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| 56 | {
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| 57 | ssize_t nread;
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| 58 | ssize_t allread = 0;
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| 59 | int result;
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| 60 | timediff_t timeleft;
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| 61 | *n = 0;
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| 62 | for(;;) {
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| 63 | timeleft = Curl_timeleft(conn->data, NULL, TRUE);
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| 64 | if(timeleft < 0) {
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| 65 | /* we already got the timeout */
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| 66 | result = CURLE_OPERATION_TIMEDOUT;
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| 67 | break;
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| 68 | }
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| 69 | if(SOCKET_READABLE(sockfd, timeleft) <= 0) {
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| 70 | result = ~CURLE_OK;
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| 71 | break;
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| 72 | }
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| 73 | result = Curl_read_plain(sockfd, buf, buffersize, &nread);
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| 74 | if(CURLE_AGAIN == result)
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| 75 | continue;
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| 76 | if(result)
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| 77 | break;
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| 78 |
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| 79 | if(buffersize == nread) {
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| 80 | allread += nread;
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| 81 | *n = allread;
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| 82 | result = CURLE_OK;
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| 83 | break;
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| 84 | }
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| 85 | if(!nread) {
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| 86 | result = ~CURLE_OK;
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| 87 | break;
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| 88 | }
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| 89 |
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| 90 | buffersize -= nread;
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| 91 | buf += nread;
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| 92 | allread += nread;
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| 93 | }
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| 94 | return result;
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| 95 | }
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| 96 |
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| 97 | /*
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| 98 | * This function logs in to a SOCKS4 proxy and sends the specifics to the final
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| 99 | * destination server.
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| 100 | *
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| 101 | * Reference :
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| 102 | * http://socks.permeo.com/protocol/socks4.protocol
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| 103 | *
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| 104 | * Note :
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| 105 | * Set protocol4a=true for "SOCKS 4A (Simple Extension to SOCKS 4 Protocol)"
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| 106 | * Nonsupport "Identification Protocol (RFC1413)"
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| 107 | */
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| 108 | CURLcode Curl_SOCKS4(const char *proxy_user,
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| 109 | const char *hostname,
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| 110 | int remote_port,
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| 111 | int sockindex,
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| 112 | struct connectdata *conn)
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| 113 | {
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| 114 | const bool protocol4a =
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| 115 | (conn->socks_proxy.proxytype == CURLPROXY_SOCKS4A) ? TRUE : FALSE;
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| 116 | #define SOCKS4REQLEN 262
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| 117 | unsigned char socksreq[SOCKS4REQLEN]; /* room for SOCKS4 request incl. user
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| 118 | id */
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| 119 | int result;
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| 120 | CURLcode code;
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| 121 | curl_socket_t sock = conn->sock[sockindex];
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| 122 | struct Curl_easy *data = conn->data;
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| 123 |
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| 124 | if(Curl_timeleft(data, NULL, TRUE) < 0) {
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| 125 | /* time-out, bail out, go home */
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| 126 | failf(data, "Connection time-out");
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| 127 | return CURLE_OPERATION_TIMEDOUT;
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| 128 | }
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| 129 |
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| 130 | if(conn->bits.httpproxy)
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| 131 | infof(conn->data, "SOCKS4%s: connecting to HTTP proxy %s port %d\n",
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| 132 | protocol4a ? "a" : "", hostname, remote_port);
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| 133 |
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| 134 | (void)curlx_nonblock(sock, FALSE);
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| 135 |
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| 136 | infof(data, "SOCKS4 communication to %s:%d\n", hostname, remote_port);
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| 137 |
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| 138 | /*
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| 139 | * Compose socks4 request
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| 140 | *
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| 141 | * Request format
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| 142 | *
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| 143 | * +----+----+----+----+----+----+----+----+----+----+....+----+
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| 144 | * | VN | CD | DSTPORT | DSTIP | USERID |NULL|
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| 145 | * +----+----+----+----+----+----+----+----+----+----+....+----+
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| 146 | * # of bytes: 1 1 2 4 variable 1
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| 147 | */
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| 148 |
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| 149 | socksreq[0] = 4; /* version (SOCKS4) */
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| 150 | socksreq[1] = 1; /* connect */
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| 151 | socksreq[2] = (unsigned char)((remote_port >> 8) & 0xff); /* PORT MSB */
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| 152 | socksreq[3] = (unsigned char)(remote_port & 0xff); /* PORT LSB */
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| 153 |
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| 154 | /* DNS resolve only for SOCKS4, not SOCKS4a */
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| 155 | if(!protocol4a) {
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| 156 | struct Curl_dns_entry *dns;
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| 157 | Curl_addrinfo *hp = NULL;
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| 158 | int rc;
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| 159 |
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| 160 | rc = Curl_resolv(conn, hostname, remote_port, &dns);
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| 161 |
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| 162 | if(rc == CURLRESOLV_ERROR)
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| 163 | return CURLE_COULDNT_RESOLVE_PROXY;
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| 164 |
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| 165 | if(rc == CURLRESOLV_PENDING)
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| 166 | /* ignores the return code, but 'dns' remains NULL on failure */
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| 167 | (void)Curl_resolver_wait_resolv(conn, &dns);
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| 168 |
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| 169 | /*
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| 170 | * We cannot use 'hostent' as a struct that Curl_resolv() returns. It
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| 171 | * returns a Curl_addrinfo pointer that may not always look the same.
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| 172 | */
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| 173 | if(dns)
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| 174 | hp = dns->addr;
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| 175 | if(hp) {
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| 176 | char buf[64];
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| 177 | Curl_printable_address(hp, buf, sizeof(buf));
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| 178 |
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| 179 | if(hp->ai_family == AF_INET) {
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| 180 | struct sockaddr_in *saddr_in;
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| 181 |
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| 182 | saddr_in = (struct sockaddr_in *)(void *)hp->ai_addr;
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| 183 | socksreq[4] = ((unsigned char *)&saddr_in->sin_addr.s_addr)[0];
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| 184 | socksreq[5] = ((unsigned char *)&saddr_in->sin_addr.s_addr)[1];
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| 185 | socksreq[6] = ((unsigned char *)&saddr_in->sin_addr.s_addr)[2];
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| 186 | socksreq[7] = ((unsigned char *)&saddr_in->sin_addr.s_addr)[3];
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| 187 |
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| 188 | infof(data, "SOCKS4 connect to IPv4 %s (locally resolved)\n", buf);
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| 189 | }
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| 190 | else {
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| 191 | hp = NULL; /* fail! */
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| 192 |
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| 193 | failf(data, "SOCKS4 connection to %s not supported\n", buf);
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| 194 | }
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| 195 |
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| 196 | Curl_resolv_unlock(data, dns); /* not used anymore from now on */
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| 197 | }
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| 198 | if(!hp) {
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| 199 | failf(data, "Failed to resolve \"%s\" for SOCKS4 connect.",
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| 200 | hostname);
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| 201 | return CURLE_COULDNT_RESOLVE_HOST;
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| 202 | }
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| 203 | }
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| 204 |
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| 205 | /*
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| 206 | * This is currently not supporting "Identification Protocol (RFC1413)".
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| 207 | */
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| 208 | socksreq[8] = 0; /* ensure empty userid is NUL-terminated */
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| 209 | if(proxy_user) {
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| 210 | size_t plen = strlen(proxy_user);
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| 211 | if(plen >= sizeof(socksreq) - 8) {
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| 212 | failf(data, "Too long SOCKS proxy name, can't use!\n");
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| 213 | return CURLE_COULDNT_CONNECT;
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| 214 | }
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| 215 | /* copy the proxy name WITH trailing zero */
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| 216 | memcpy(socksreq + 8, proxy_user, plen + 1);
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| 217 | }
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| 218 |
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| 219 | /*
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| 220 | * Make connection
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| 221 | */
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| 222 | {
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| 223 | ssize_t actualread;
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| 224 | ssize_t written;
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| 225 | ssize_t hostnamelen = 0;
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| 226 | int packetsize = 9 +
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| 227 | (int)strlen((char *)socksreq + 8); /* size including NUL */
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| 228 |
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| 229 | /* If SOCKS4a, set special invalid IP address 0.0.0.x */
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| 230 | if(protocol4a) {
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| 231 | socksreq[4] = 0;
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| 232 | socksreq[5] = 0;
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| 233 | socksreq[6] = 0;
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| 234 | socksreq[7] = 1;
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| 235 | /* If still enough room in buffer, also append hostname */
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| 236 | hostnamelen = (ssize_t)strlen(hostname) + 1; /* length including NUL */
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| 237 | if(packetsize + hostnamelen <= SOCKS4REQLEN)
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| 238 | strcpy((char *)socksreq + packetsize, hostname);
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| 239 | else
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| 240 | hostnamelen = 0; /* Flag: hostname did not fit in buffer */
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| 241 | }
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| 242 |
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| 243 | /* Send request */
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| 244 | code = Curl_write_plain(conn, sock, (char *)socksreq,
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| 245 | packetsize + hostnamelen,
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| 246 | &written);
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| 247 | if(code || (written != packetsize + hostnamelen)) {
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| 248 | failf(data, "Failed to send SOCKS4 connect request.");
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| 249 | return CURLE_COULDNT_CONNECT;
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| 250 | }
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| 251 | if(protocol4a && hostnamelen == 0) {
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| 252 | /* SOCKS4a with very long hostname - send that name separately */
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| 253 | hostnamelen = (ssize_t)strlen(hostname) + 1;
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| 254 | code = Curl_write_plain(conn, sock, (char *)hostname, hostnamelen,
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| 255 | &written);
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| 256 | if(code || (written != hostnamelen)) {
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| 257 | failf(data, "Failed to send SOCKS4 connect request.");
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| 258 | return CURLE_COULDNT_CONNECT;
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| 259 | }
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| 260 | }
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| 261 |
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| 262 | packetsize = 8; /* receive data size */
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| 263 |
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| 264 | /* Receive response */
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| 265 | result = Curl_blockread_all(conn, sock, (char *)socksreq, packetsize,
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| 266 | &actualread);
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| 267 | if(result || (actualread != packetsize)) {
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| 268 | failf(data, "Failed to receive SOCKS4 connect request ack.");
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| 269 | return CURLE_COULDNT_CONNECT;
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| 270 | }
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| 271 |
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| 272 | /*
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| 273 | * Response format
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| 274 | *
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| 275 | * +----+----+----+----+----+----+----+----+
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| 276 | * | VN | CD | DSTPORT | DSTIP |
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| 277 | * +----+----+----+----+----+----+----+----+
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| 278 | * # of bytes: 1 1 2 4
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| 279 | *
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| 280 | * VN is the version of the reply code and should be 0. CD is the result
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| 281 | * code with one of the following values:
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| 282 | *
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| 283 | * 90: request granted
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| 284 | * 91: request rejected or failed
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| 285 | * 92: request rejected because SOCKS server cannot connect to
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| 286 | * identd on the client
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| 287 | * 93: request rejected because the client program and identd
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| 288 | * report different user-ids
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| 289 | */
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| 290 |
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| 291 | /* wrong version ? */
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| 292 | if(socksreq[0] != 0) {
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| 293 | failf(data,
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| 294 | "SOCKS4 reply has wrong version, version should be 4.");
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| 295 | return CURLE_COULDNT_CONNECT;
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| 296 | }
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| 297 |
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| 298 | /* Result */
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| 299 | switch(socksreq[1]) {
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| 300 | case 90:
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| 301 | infof(data, "SOCKS4%s request granted.\n", protocol4a?"a":"");
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| 302 | break;
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| 303 | case 91:
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| 304 | failf(data,
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| 305 | "Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
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| 306 | ", request rejected or failed.",
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| 307 | (unsigned char)socksreq[4], (unsigned char)socksreq[5],
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| 308 | (unsigned char)socksreq[6], (unsigned char)socksreq[7],
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| 309 | (((unsigned char)socksreq[2] << 8) | (unsigned char)socksreq[3]),
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| 310 | (unsigned char)socksreq[1]);
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| 311 | return CURLE_COULDNT_CONNECT;
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| 312 | case 92:
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| 313 | failf(data,
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| 314 | "Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
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| 315 | ", request rejected because SOCKS server cannot connect to "
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| 316 | "identd on the client.",
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| 317 | (unsigned char)socksreq[4], (unsigned char)socksreq[5],
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| 318 | (unsigned char)socksreq[6], (unsigned char)socksreq[7],
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| 319 | (((unsigned char)socksreq[2] << 8) | (unsigned char)socksreq[3]),
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| 320 | (unsigned char)socksreq[1]);
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| 321 | return CURLE_COULDNT_CONNECT;
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| 322 | case 93:
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| 323 | failf(data,
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| 324 | "Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
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| 325 | ", request rejected because the client program and identd "
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| 326 | "report different user-ids.",
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| 327 | (unsigned char)socksreq[4], (unsigned char)socksreq[5],
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| 328 | (unsigned char)socksreq[6], (unsigned char)socksreq[7],
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| 329 | (((unsigned char)socksreq[2] << 8) | (unsigned char)socksreq[3]),
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| 330 | (unsigned char)socksreq[1]);
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| 331 | return CURLE_COULDNT_CONNECT;
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| 332 | default:
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| 333 | failf(data,
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| 334 | "Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
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| 335 | ", Unknown.",
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| 336 | (unsigned char)socksreq[4], (unsigned char)socksreq[5],
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| 337 | (unsigned char)socksreq[6], (unsigned char)socksreq[7],
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| 338 | (((unsigned char)socksreq[2] << 8) | (unsigned char)socksreq[3]),
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| 339 | (unsigned char)socksreq[1]);
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| 340 | return CURLE_COULDNT_CONNECT;
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| 341 | }
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| 342 | }
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| 343 |
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| 344 | (void)curlx_nonblock(sock, TRUE);
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| 345 |
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| 346 | return CURLE_OK; /* Proxy was successful! */
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| 347 | }
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| 348 |
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| 349 | /*
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| 350 | * This function logs in to a SOCKS5 proxy and sends the specifics to the final
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| 351 | * destination server.
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| 352 | */
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| 353 | CURLcode Curl_SOCKS5(const char *proxy_user,
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| 354 | const char *proxy_password,
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| 355 | const char *hostname,
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| 356 | int remote_port,
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| 357 | int sockindex,
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| 358 | struct connectdata *conn)
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| 359 | {
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| 360 | /*
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| 361 | According to the RFC1928, section "6. Replies". This is what a SOCK5
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| 362 | replies:
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| 363 |
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| 364 | +----+-----+-------+------+----------+----------+
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| 365 | |VER | REP | RSV | ATYP | BND.ADDR | BND.PORT |
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| 366 | +----+-----+-------+------+----------+----------+
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| 367 | | 1 | 1 | X'00' | 1 | Variable | 2 |
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| 368 | +----+-----+-------+------+----------+----------+
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| 369 |
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| 370 | Where:
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| 371 |
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| 372 | o VER protocol version: X'05'
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| 373 | o REP Reply field:
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| 374 | o X'00' succeeded
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| 375 | */
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| 376 |
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| 377 | unsigned char socksreq[600]; /* room for large user/pw (255 max each) */
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| 378 | int idx;
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| 379 | ssize_t actualread;
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| 380 | ssize_t written;
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| 381 | int result;
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| 382 | CURLcode code;
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| 383 | curl_socket_t sock = conn->sock[sockindex];
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| 384 | struct Curl_easy *data = conn->data;
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| 385 | timediff_t timeout;
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| 386 | bool socks5_resolve_local =
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| 387 | (conn->socks_proxy.proxytype == CURLPROXY_SOCKS5) ? TRUE : FALSE;
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| 388 | const size_t hostname_len = strlen(hostname);
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| 389 | ssize_t len = 0;
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| 390 | const unsigned long auth = data->set.socks5auth;
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| 391 | bool allow_gssapi = FALSE;
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| 392 |
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| 393 | if(conn->bits.httpproxy)
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| 394 | infof(conn->data, "SOCKS5: connecting to HTTP proxy %s port %d\n",
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| 395 | hostname, remote_port);
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| 396 |
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| 397 | /* RFC1928 chapter 5 specifies max 255 chars for domain name in packet */
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| 398 | if(!socks5_resolve_local && hostname_len > 255) {
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| 399 | infof(conn->data, "SOCKS5: server resolving disabled for hostnames of "
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| 400 | "length > 255 [actual len=%zu]\n", hostname_len);
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| 401 | socks5_resolve_local = TRUE;
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| 402 | }
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| 403 |
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| 404 | /* get timeout */
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| 405 | timeout = Curl_timeleft(data, NULL, TRUE);
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| 406 |
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| 407 | if(timeout < 0) {
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| 408 | /* time-out, bail out, go home */
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| 409 | failf(data, "Connection time-out");
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| 410 | return CURLE_OPERATION_TIMEDOUT;
|
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| 411 | }
|
---|
| 412 |
|
---|
| 413 | (void)curlx_nonblock(sock, TRUE);
|
---|
| 414 |
|
---|
| 415 | /* wait until socket gets connected */
|
---|
| 416 | result = SOCKET_WRITABLE(sock, timeout);
|
---|
| 417 |
|
---|
| 418 | if(-1 == result) {
|
---|
| 419 | failf(conn->data, "SOCKS5: no connection here");
|
---|
| 420 | return CURLE_COULDNT_CONNECT;
|
---|
| 421 | }
|
---|
| 422 | if(0 == result) {
|
---|
| 423 | failf(conn->data, "SOCKS5: connection timeout");
|
---|
| 424 | return CURLE_OPERATION_TIMEDOUT;
|
---|
| 425 | }
|
---|
| 426 |
|
---|
| 427 | if(result & CURL_CSELECT_ERR) {
|
---|
| 428 | failf(conn->data, "SOCKS5: error occurred during connection");
|
---|
| 429 | return CURLE_COULDNT_CONNECT;
|
---|
| 430 | }
|
---|
| 431 |
|
---|
| 432 | if(auth & ~(CURLAUTH_BASIC | CURLAUTH_GSSAPI))
|
---|
| 433 | infof(conn->data,
|
---|
| 434 | "warning: unsupported value passed to CURLOPT_SOCKS5_AUTH: %lu\n",
|
---|
| 435 | auth);
|
---|
| 436 | if(!(auth & CURLAUTH_BASIC))
|
---|
| 437 | /* disable username/password auth */
|
---|
| 438 | proxy_user = NULL;
|
---|
| 439 | #if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
|
---|
| 440 | if(auth & CURLAUTH_GSSAPI)
|
---|
| 441 | allow_gssapi = TRUE;
|
---|
| 442 | #endif
|
---|
| 443 |
|
---|
| 444 | idx = 0;
|
---|
| 445 | socksreq[idx++] = 5; /* version */
|
---|
| 446 | idx++; /* reserve for the number of authentication methods */
|
---|
| 447 | socksreq[idx++] = 0; /* no authentication */
|
---|
| 448 | if(allow_gssapi)
|
---|
| 449 | socksreq[idx++] = 1; /* GSS-API */
|
---|
| 450 | if(proxy_user)
|
---|
| 451 | socksreq[idx++] = 2; /* username/password */
|
---|
| 452 | /* write the number of authentication methods */
|
---|
| 453 | socksreq[1] = (unsigned char) (idx - 2);
|
---|
| 454 |
|
---|
| 455 | (void)curlx_nonblock(sock, FALSE);
|
---|
| 456 |
|
---|
| 457 | infof(data, "SOCKS5 communication to %s:%d\n", hostname, remote_port);
|
---|
| 458 |
|
---|
| 459 | code = Curl_write_plain(conn, sock, (char *)socksreq, (2 + (int)socksreq[1]),
|
---|
| 460 | &written);
|
---|
| 461 | if(code || (written != (2 + (int)socksreq[1]))) {
|
---|
| 462 | failf(data, "Unable to send initial SOCKS5 request.");
|
---|
| 463 | return CURLE_COULDNT_CONNECT;
|
---|
| 464 | }
|
---|
| 465 |
|
---|
| 466 | (void)curlx_nonblock(sock, TRUE);
|
---|
| 467 |
|
---|
| 468 | result = SOCKET_READABLE(sock, timeout);
|
---|
| 469 |
|
---|
| 470 | if(-1 == result) {
|
---|
| 471 | failf(conn->data, "SOCKS5 nothing to read");
|
---|
| 472 | return CURLE_COULDNT_CONNECT;
|
---|
| 473 | }
|
---|
| 474 | if(0 == result) {
|
---|
| 475 | failf(conn->data, "SOCKS5 read timeout");
|
---|
| 476 | return CURLE_OPERATION_TIMEDOUT;
|
---|
| 477 | }
|
---|
| 478 |
|
---|
| 479 | if(result & CURL_CSELECT_ERR) {
|
---|
| 480 | failf(conn->data, "SOCKS5 read error occurred");
|
---|
| 481 | return CURLE_RECV_ERROR;
|
---|
| 482 | }
|
---|
| 483 |
|
---|
| 484 | (void)curlx_nonblock(sock, FALSE);
|
---|
| 485 |
|
---|
| 486 | result = Curl_blockread_all(conn, sock, (char *)socksreq, 2, &actualread);
|
---|
| 487 | if(result || (actualread != 2)) {
|
---|
| 488 | failf(data, "Unable to receive initial SOCKS5 response.");
|
---|
| 489 | return CURLE_COULDNT_CONNECT;
|
---|
| 490 | }
|
---|
| 491 |
|
---|
| 492 | if(socksreq[0] != 5) {
|
---|
| 493 | failf(data, "Received invalid version in initial SOCKS5 response.");
|
---|
| 494 | return CURLE_COULDNT_CONNECT;
|
---|
| 495 | }
|
---|
| 496 | if(socksreq[1] == 0) {
|
---|
| 497 | /* Nothing to do, no authentication needed */
|
---|
| 498 | ;
|
---|
| 499 | }
|
---|
| 500 | #if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
|
---|
| 501 | else if(allow_gssapi && (socksreq[1] == 1)) {
|
---|
| 502 | code = Curl_SOCKS5_gssapi_negotiate(sockindex, conn);
|
---|
| 503 | if(code) {
|
---|
| 504 | failf(data, "Unable to negotiate SOCKS5 GSS-API context.");
|
---|
| 505 | return CURLE_COULDNT_CONNECT;
|
---|
| 506 | }
|
---|
| 507 | }
|
---|
| 508 | #endif
|
---|
| 509 | else if(socksreq[1] == 2) {
|
---|
| 510 | /* Needs user name and password */
|
---|
| 511 | size_t proxy_user_len, proxy_password_len;
|
---|
| 512 | if(proxy_user && proxy_password) {
|
---|
| 513 | proxy_user_len = strlen(proxy_user);
|
---|
| 514 | proxy_password_len = strlen(proxy_password);
|
---|
| 515 | }
|
---|
| 516 | else {
|
---|
| 517 | proxy_user_len = 0;
|
---|
| 518 | proxy_password_len = 0;
|
---|
| 519 | }
|
---|
| 520 |
|
---|
| 521 | /* username/password request looks like
|
---|
| 522 | * +----+------+----------+------+----------+
|
---|
| 523 | * |VER | ULEN | UNAME | PLEN | PASSWD |
|
---|
| 524 | * +----+------+----------+------+----------+
|
---|
| 525 | * | 1 | 1 | 1 to 255 | 1 | 1 to 255 |
|
---|
| 526 | * +----+------+----------+------+----------+
|
---|
| 527 | */
|
---|
| 528 | len = 0;
|
---|
| 529 | socksreq[len++] = 1; /* username/pw subnegotiation version */
|
---|
| 530 | socksreq[len++] = (unsigned char) proxy_user_len;
|
---|
| 531 | if(proxy_user && proxy_user_len)
|
---|
| 532 | memcpy(socksreq + len, proxy_user, proxy_user_len);
|
---|
| 533 | len += proxy_user_len;
|
---|
| 534 | socksreq[len++] = (unsigned char) proxy_password_len;
|
---|
| 535 | if(proxy_password && proxy_password_len)
|
---|
| 536 | memcpy(socksreq + len, proxy_password, proxy_password_len);
|
---|
| 537 | len += proxy_password_len;
|
---|
| 538 |
|
---|
| 539 | code = Curl_write_plain(conn, sock, (char *)socksreq, len, &written);
|
---|
| 540 | if(code || (len != written)) {
|
---|
| 541 | failf(data, "Failed to send SOCKS5 sub-negotiation request.");
|
---|
| 542 | return CURLE_COULDNT_CONNECT;
|
---|
| 543 | }
|
---|
| 544 |
|
---|
| 545 | result = Curl_blockread_all(conn, sock, (char *)socksreq, 2, &actualread);
|
---|
| 546 | if(result || (actualread != 2)) {
|
---|
| 547 | failf(data, "Unable to receive SOCKS5 sub-negotiation response.");
|
---|
| 548 | return CURLE_COULDNT_CONNECT;
|
---|
| 549 | }
|
---|
| 550 |
|
---|
| 551 | /* ignore the first (VER) byte */
|
---|
| 552 | if(socksreq[1] != 0) { /* status */
|
---|
| 553 | failf(data, "User was rejected by the SOCKS5 server (%d %d).",
|
---|
| 554 | socksreq[0], socksreq[1]);
|
---|
| 555 | return CURLE_COULDNT_CONNECT;
|
---|
| 556 | }
|
---|
| 557 |
|
---|
| 558 | /* Everything is good so far, user was authenticated! */
|
---|
| 559 | }
|
---|
| 560 | else {
|
---|
| 561 | /* error */
|
---|
| 562 | if(!allow_gssapi && (socksreq[1] == 1)) {
|
---|
| 563 | failf(data,
|
---|
| 564 | "SOCKS5 GSSAPI per-message authentication is not supported.");
|
---|
| 565 | return CURLE_COULDNT_CONNECT;
|
---|
| 566 | }
|
---|
| 567 | if(socksreq[1] == 255) {
|
---|
| 568 | if(!proxy_user || !*proxy_user) {
|
---|
| 569 | failf(data,
|
---|
| 570 | "No authentication method was acceptable. (It is quite likely"
|
---|
| 571 | " that the SOCKS5 server wanted a username/password, since none"
|
---|
| 572 | " was supplied to the server on this connection.)");
|
---|
| 573 | }
|
---|
| 574 | else {
|
---|
| 575 | failf(data, "No authentication method was acceptable.");
|
---|
| 576 | }
|
---|
| 577 | return CURLE_COULDNT_CONNECT;
|
---|
| 578 | }
|
---|
| 579 | else {
|
---|
| 580 | failf(data,
|
---|
| 581 | "Undocumented SOCKS5 mode attempted to be used by server.");
|
---|
| 582 | return CURLE_COULDNT_CONNECT;
|
---|
| 583 | }
|
---|
| 584 | }
|
---|
| 585 |
|
---|
| 586 | /* Authentication is complete, now specify destination to the proxy */
|
---|
| 587 | len = 0;
|
---|
| 588 | socksreq[len++] = 5; /* version (SOCKS5) */
|
---|
| 589 | socksreq[len++] = 1; /* connect */
|
---|
| 590 | socksreq[len++] = 0; /* must be zero */
|
---|
| 591 |
|
---|
| 592 | if(!socks5_resolve_local) {
|
---|
| 593 | socksreq[len++] = 3; /* ATYP: domain name = 3 */
|
---|
| 594 | socksreq[len++] = (char) hostname_len; /* address length */
|
---|
| 595 | memcpy(&socksreq[len], hostname, hostname_len); /* address str w/o NULL */
|
---|
| 596 | len += hostname_len;
|
---|
| 597 | }
|
---|
| 598 | else {
|
---|
| 599 | struct Curl_dns_entry *dns;
|
---|
| 600 | Curl_addrinfo *hp = NULL;
|
---|
| 601 | int rc = Curl_resolv(conn, hostname, remote_port, &dns);
|
---|
| 602 |
|
---|
| 603 | if(rc == CURLRESOLV_ERROR)
|
---|
| 604 | return CURLE_COULDNT_RESOLVE_HOST;
|
---|
| 605 |
|
---|
| 606 | if(rc == CURLRESOLV_PENDING) {
|
---|
| 607 | /* this requires that we're in "wait for resolve" state */
|
---|
| 608 | code = Curl_resolver_wait_resolv(conn, &dns);
|
---|
| 609 | if(code)
|
---|
| 610 | return code;
|
---|
| 611 | }
|
---|
| 612 |
|
---|
| 613 | /*
|
---|
| 614 | * We cannot use 'hostent' as a struct that Curl_resolv() returns. It
|
---|
| 615 | * returns a Curl_addrinfo pointer that may not always look the same.
|
---|
| 616 | */
|
---|
| 617 | if(dns)
|
---|
| 618 | hp = dns->addr;
|
---|
| 619 | if(hp) {
|
---|
| 620 | int i;
|
---|
| 621 | char buf[64];
|
---|
| 622 | Curl_printable_address(hp, buf, sizeof(buf));
|
---|
| 623 |
|
---|
| 624 | if(hp->ai_family == AF_INET) {
|
---|
| 625 | struct sockaddr_in *saddr_in;
|
---|
| 626 | socksreq[len++] = 1; /* ATYP: IPv4 = 1 */
|
---|
| 627 |
|
---|
| 628 | saddr_in = (struct sockaddr_in *)(void *)hp->ai_addr;
|
---|
| 629 | for(i = 0; i < 4; i++) {
|
---|
| 630 | socksreq[len++] = ((unsigned char *)&saddr_in->sin_addr.s_addr)[i];
|
---|
| 631 | }
|
---|
| 632 |
|
---|
| 633 | infof(data, "SOCKS5 connect to IPv4 %s (locally resolved)\n", buf);
|
---|
| 634 | }
|
---|
| 635 | #ifdef ENABLE_IPV6
|
---|
| 636 | else if(hp->ai_family == AF_INET6) {
|
---|
| 637 | struct sockaddr_in6 *saddr_in6;
|
---|
| 638 | socksreq[len++] = 4; /* ATYP: IPv6 = 4 */
|
---|
| 639 |
|
---|
| 640 | saddr_in6 = (struct sockaddr_in6 *)(void *)hp->ai_addr;
|
---|
| 641 | for(i = 0; i < 16; i++) {
|
---|
| 642 | socksreq[len++] =
|
---|
| 643 | ((unsigned char *)&saddr_in6->sin6_addr.s6_addr)[i];
|
---|
| 644 | }
|
---|
| 645 |
|
---|
| 646 | infof(data, "SOCKS5 connect to IPv6 %s (locally resolved)\n", buf);
|
---|
| 647 | }
|
---|
| 648 | #endif
|
---|
| 649 | else {
|
---|
| 650 | hp = NULL; /* fail! */
|
---|
| 651 |
|
---|
| 652 | failf(data, "SOCKS5 connection to %s not supported\n", buf);
|
---|
| 653 | }
|
---|
| 654 |
|
---|
| 655 | Curl_resolv_unlock(data, dns); /* not used anymore from now on */
|
---|
| 656 | }
|
---|
| 657 | if(!hp) {
|
---|
| 658 | failf(data, "Failed to resolve \"%s\" for SOCKS5 connect.",
|
---|
| 659 | hostname);
|
---|
| 660 | return CURLE_COULDNT_RESOLVE_HOST;
|
---|
| 661 | }
|
---|
| 662 | }
|
---|
| 663 |
|
---|
| 664 | socksreq[len++] = (unsigned char)((remote_port >> 8) & 0xff); /* PORT MSB */
|
---|
| 665 | socksreq[len++] = (unsigned char)(remote_port & 0xff); /* PORT LSB */
|
---|
| 666 |
|
---|
| 667 | #if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
|
---|
| 668 | if(conn->socks5_gssapi_enctype) {
|
---|
| 669 | failf(data, "SOCKS5 GSS-API protection not yet implemented.");
|
---|
| 670 | }
|
---|
| 671 | else
|
---|
| 672 | #endif
|
---|
| 673 | code = Curl_write_plain(conn, sock, (char *)socksreq, len, &written);
|
---|
| 674 |
|
---|
| 675 | if(code || (len != written)) {
|
---|
| 676 | failf(data, "Failed to send SOCKS5 connect request.");
|
---|
| 677 | return CURLE_COULDNT_CONNECT;
|
---|
| 678 | }
|
---|
| 679 |
|
---|
| 680 | len = 10; /* minimum packet size is 10 */
|
---|
| 681 |
|
---|
| 682 | #if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
|
---|
| 683 | if(conn->socks5_gssapi_enctype) {
|
---|
| 684 | failf(data, "SOCKS5 GSS-API protection not yet implemented.");
|
---|
| 685 | }
|
---|
| 686 | else
|
---|
| 687 | #endif
|
---|
| 688 | result = Curl_blockread_all(conn, sock, (char *)socksreq,
|
---|
| 689 | len, &actualread);
|
---|
| 690 |
|
---|
| 691 | if(result || (len != actualread)) {
|
---|
| 692 | failf(data, "Failed to receive SOCKS5 connect request ack.");
|
---|
| 693 | return CURLE_COULDNT_CONNECT;
|
---|
| 694 | }
|
---|
| 695 |
|
---|
| 696 | if(socksreq[0] != 5) { /* version */
|
---|
| 697 | failf(data,
|
---|
| 698 | "SOCKS5 reply has wrong version, version should be 5.");
|
---|
| 699 | return CURLE_COULDNT_CONNECT;
|
---|
| 700 | }
|
---|
| 701 |
|
---|
| 702 | /* Fix: in general, returned BND.ADDR is variable length parameter by RFC
|
---|
| 703 | 1928, so the reply packet should be read until the end to avoid errors at
|
---|
| 704 | subsequent protocol level.
|
---|
| 705 |
|
---|
| 706 | +----+-----+-------+------+----------+----------+
|
---|
| 707 | |VER | REP | RSV | ATYP | BND.ADDR | BND.PORT |
|
---|
| 708 | +----+-----+-------+------+----------+----------+
|
---|
| 709 | | 1 | 1 | X'00' | 1 | Variable | 2 |
|
---|
| 710 | +----+-----+-------+------+----------+----------+
|
---|
| 711 |
|
---|
| 712 | ATYP:
|
---|
| 713 | o IP v4 address: X'01', BND.ADDR = 4 byte
|
---|
| 714 | o domain name: X'03', BND.ADDR = [ 1 byte length, string ]
|
---|
| 715 | o IP v6 address: X'04', BND.ADDR = 16 byte
|
---|
| 716 | */
|
---|
| 717 |
|
---|
| 718 | /* Calculate real packet size */
|
---|
| 719 | if(socksreq[3] == 3) {
|
---|
| 720 | /* domain name */
|
---|
| 721 | int addrlen = (int) socksreq[4];
|
---|
| 722 | len = 5 + addrlen + 2;
|
---|
| 723 | }
|
---|
| 724 | else if(socksreq[3] == 4) {
|
---|
| 725 | /* IPv6 */
|
---|
| 726 | len = 4 + 16 + 2;
|
---|
| 727 | }
|
---|
| 728 |
|
---|
| 729 | /* At this point we already read first 10 bytes */
|
---|
| 730 | #if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
|
---|
| 731 | if(!conn->socks5_gssapi_enctype) {
|
---|
| 732 | /* decrypt_gssapi_blockread already read the whole packet */
|
---|
| 733 | #endif
|
---|
| 734 | if(len > 10) {
|
---|
| 735 | result = Curl_blockread_all(conn, sock, (char *)&socksreq[10],
|
---|
| 736 | len - 10, &actualread);
|
---|
| 737 | if(result || ((len - 10) != actualread)) {
|
---|
| 738 | failf(data, "Failed to receive SOCKS5 connect request ack.");
|
---|
| 739 | return CURLE_COULDNT_CONNECT;
|
---|
| 740 | }
|
---|
| 741 | }
|
---|
| 742 | #if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
|
---|
| 743 | }
|
---|
| 744 | #endif
|
---|
| 745 |
|
---|
| 746 | if(socksreq[1] != 0) { /* Anything besides 0 is an error */
|
---|
| 747 | if(socksreq[3] == 1) {
|
---|
| 748 | failf(data,
|
---|
| 749 | "Can't complete SOCKS5 connection to %d.%d.%d.%d:%d. (%d)",
|
---|
| 750 | (unsigned char)socksreq[4], (unsigned char)socksreq[5],
|
---|
| 751 | (unsigned char)socksreq[6], (unsigned char)socksreq[7],
|
---|
| 752 | (((unsigned char)socksreq[8] << 8) |
|
---|
| 753 | (unsigned char)socksreq[9]),
|
---|
| 754 | (unsigned char)socksreq[1]);
|
---|
| 755 | }
|
---|
| 756 | else if(socksreq[3] == 3) {
|
---|
| 757 | unsigned char port_upper = (unsigned char)socksreq[len - 2];
|
---|
| 758 | socksreq[len - 2] = 0;
|
---|
| 759 | failf(data,
|
---|
| 760 | "Can't complete SOCKS5 connection to %s:%d. (%d)",
|
---|
| 761 | (char *)&socksreq[5],
|
---|
| 762 | ((port_upper << 8) |
|
---|
| 763 | (unsigned char)socksreq[len - 1]),
|
---|
| 764 | (unsigned char)socksreq[1]);
|
---|
| 765 | socksreq[len - 2] = port_upper;
|
---|
| 766 | }
|
---|
| 767 | else if(socksreq[3] == 4) {
|
---|
| 768 | failf(data,
|
---|
| 769 | "Can't complete SOCKS5 connection to %02x%02x:%02x%02x:"
|
---|
| 770 | "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%d. (%d)",
|
---|
| 771 | (unsigned char)socksreq[4], (unsigned char)socksreq[5],
|
---|
| 772 | (unsigned char)socksreq[6], (unsigned char)socksreq[7],
|
---|
| 773 | (unsigned char)socksreq[8], (unsigned char)socksreq[9],
|
---|
| 774 | (unsigned char)socksreq[10], (unsigned char)socksreq[11],
|
---|
| 775 | (unsigned char)socksreq[12], (unsigned char)socksreq[13],
|
---|
| 776 | (unsigned char)socksreq[14], (unsigned char)socksreq[15],
|
---|
| 777 | (unsigned char)socksreq[16], (unsigned char)socksreq[17],
|
---|
| 778 | (unsigned char)socksreq[18], (unsigned char)socksreq[19],
|
---|
| 779 | (((unsigned char)socksreq[20] << 8) |
|
---|
| 780 | (unsigned char)socksreq[21]),
|
---|
| 781 | (unsigned char)socksreq[1]);
|
---|
| 782 | }
|
---|
| 783 | return CURLE_COULDNT_CONNECT;
|
---|
| 784 | }
|
---|
| 785 | infof(data, "SOCKS5 request granted.\n");
|
---|
| 786 |
|
---|
| 787 | (void)curlx_nonblock(sock, TRUE);
|
---|
| 788 | return CURLE_OK; /* Proxy was successful! */
|
---|
| 789 | }
|
---|
| 790 |
|
---|
| 791 | #endif /* CURL_DISABLE_PROXY */
|
---|
| 792 |
|
---|