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/* Proxytunnel - (C) 2001-2008 Jos Visser / Mark Janssen */
/* Contact: josv@osp.nl / maniac@maniac.nl */
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* http.c */
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <stdlib.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "proxytunnel.h"
#include "io.h"
#include "basicauth.h"
#include "ntlm.h"
/*
* Analyze the proxy's HTTP response. This must be a HTTP/1.? 200 OK type
* header
*/
void analyze_HTTP(PTSTREAM *pts) {
char *p = strtok( buf, " ");
/* Strip html error pages for faulty proxies (Stephane Engel <steph[at]macchiati.org>) */
while (strncmp( p, "HTTP/", 5) != 0 ) {
if ( readline(pts) ) {
p = strtok( buf, " ");
} else {
message( "analyze_HTTP: readline failed: Connection closed by remote host\n" );
exit(2);
}
}
if (strcmp( p, "HTTP/1.0" ) != 0 && strcmp( p, "HTTP/1.1" ) != 0) {
message( "Unsupported HTTP version number %s\n", p );
exit( 1 );
}
p = strtok( NULL, " ");
if( strcmp( p, "200" ) != 0 ) {
if( ! args_info.quiet_flag )
message( "HTTP return code: %s ", p );
p += strlen( p ) + 1;
if( ! args_info.quiet_flag )
message( "%s", p );
if (!ntlm_challenge && strcmp( p, "407") != 0) {
do {
readline(pts);
if (strncmp( buf, "Proxy-Authenticate: NTLM ", 25) == 0) {
if (parse_type2((unsigned char *)&buf[25]) < 0)
exit(1);
}
} while ( strcmp( buf, "\r\n" ) != 0 );
}
if (ntlm_challenge == 1) {
proxy_protocol(pts);
return;
}
exit( 1 );
}
}
/*
* Prints lines from a buffer prepended with a prefix
*/
void print_line_prefix(char *buf, char *prefix) {
buf = strdup(buf);
char *cur = strtok(buf, "\r\n");
while ( cur != NULL) {
message( "%s%s\n", prefix, cur );
cur = strtok(NULL, "\r\n");
}
// message( "%s: '%s\n", prefix, buf );
}
/*
* Execute the basic proxy protocol of CONNECT and response, until the
* last line of the response has been read. The tunnel is then open.
*/
void proxy_protocol(PTSTREAM *pts) {
/* Create the proxy CONNECT command into buf */
if (args_info.remproxy_given ) {
if( args_info.verbose_flag )
message( "\nTunneling to %s (remote proxy)\n", args_info.remproxy_arg );
sprintf( buf, "CONNECT %s HTTP/1.1\r\nHost: %s\r\n", args_info.remproxy_arg, args_info.remproxy_arg );
} else {
if( args_info.verbose_flag )
message( "\nTunneling to %s (destination)\n", args_info.dest_arg );
sprintf( buf, "CONNECT %s HTTP/1.1\r\nHost: %s\r\n", args_info.dest_arg, args_info.dest_arg );
}
if ( args_info.user_given && args_info.pass_given ) {
/* Create connect string including the authorization part */
if (args_info.ntlm_flag) {
if (ntlm_challenge == 1) {
build_type3_response();
strzcat( buf, "Proxy-Authorization: NTLM %s\r\n", ntlm_type3_buf );
} else if (ntlm_challenge == 0) {
strzcat( buf, "Proxy-Authorization: NTLM %s\r\n", ntlm_type1_buf );
}
} else {
strzcat( buf, "Proxy-Authorization: Basic %s\r\n", basicauth(args_info.user_arg, args_info.pass_arg ) );
}
}
strzcat( buf, "Proxy-Connection: Keep-Alive\r\n");
/* Add extra header(s), headers are already \r\n terminated */
if ( args_info.header_given )
strzcat( buf, "%s", args_info.header_arg );
strzcat( buf, "\r\n" );
/* Print the CONNECT instruction before sending to proxy */
if( args_info.verbose_flag ) {
message( "Communication with local proxy:\n");
print_line_prefix(buf, " -> ");
}
/* Send the CONNECT instruction to the proxy */
if( stream_write( pts, buf, strlen( buf )) < 0 ) {
my_perror( "Socket write error" );
exit( 1 );
}
// if( args_info.verbose_flag )
// message( "Data received from local proxy:\n");
if( args_info.wa_bug_29744_flag && !args_info.encryptremproxy_flag && pts->ssl ) {
message( "Switching to non-SSL communication (local proxy)\n");
pts->ssl = 0;
}
/* Read the first line of the response and analyze it */
analyze_HTTP(pts);
if (args_info.remproxy_given ) {
/* Clean buffer for next analysis */
while ( strcmp( buf, "\r\n" ) != 0 )
readline(pts);
/* If --encrypt-remproxy is specified, connect to the remote proxy using SSL */
if ( args_info.encryptremproxy_flag )
stream_enable_ssl(stunnel);
if( args_info.verbose_flag )
message( "\nTunneling to %s (destination)\n", args_info.dest_arg );
sprintf( buf, "CONNECT %s HTTP/1.1\r\nHost: %s\r\n", args_info.dest_arg, args_info.dest_arg);
if ( args_info.remuser_given && args_info.rempass_given )
strzcat( buf, "Proxy-Authorization: Basic %s\r\n", basicauth(args_info.remuser_arg, args_info.rempass_arg ));
strzcat( buf, "Proxy-Connection: Keep-Alive\r\n");
/* Add extra header(s), headers are already \r\n terminated */
if ( args_info.header_given )
strzcat( buf, "%s", args_info.header_arg );
strzcat( buf, "\r\n" );
/* Print the CONNECT instruction before sending to proxy */
if( args_info.verbose_flag ) {
message( "Communication with remote proxy:\n");
print_line_prefix(buf, " -> ");
}
/* Send the CONNECT instruction to the proxy */
if( stream_write( pts, buf, strlen( buf )) < 0 ) {
my_perror( "Socket write error" );
exit( 1 );
}
// if( args_info.verbose_flag )
// message( "Received from remote proxy:\n");
if( args_info.wa_bug_29744_flag && pts->ssl ) {
message( "Switching to non-SSL communication (remote proxy)\n");
pts->ssl = 0;
}
/* Read the first line of the response and analyze it */
analyze_HTTP(pts);
}
/*
* Then, repeat reading lines of the responses until a blank line
* (which signifies the end of the response) is encountered.
*/
if (ntlm_challenge == 1) {
ntlm_challenge = 2;
} else {
do {
readline(pts);
} while ( strcmp( buf, "\r\n" ) != 0 );
}
}
// vim:noexpandtab:ts=4
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