rfc1413.c revision acf57b44f2f61797023f7e9c2606cebf07f73d08
/* ====================================================================
* Copyright (c) 1995-1999 The Apache Group. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* 4. The names "Apache Server" and "Apache Group" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE APACHE GROUP OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Group and was originally based
* on public domain software written at the National Center for
* Supercomputing Applications, University of Illinois, Urbana-Champaign.
* For more information on the Apache Group and the Apache HTTP server
* project, please see <http://www.apache.org/>.
*
*/
/*
* rfc1413() speaks a common subset of the RFC 1413, AUTH, TAP and IDENT
* protocols. The code queries an RFC 1413 etc. compatible daemon on a remote
* host to look up the owner of a connection. The information should not be
* used for authentication purposes. This routine intercepts alarm signals.
*
* Diagnostics are reported through syslog(3).
*
* Author: Wietse Venema, Eindhoven University of Technology,
* The Netherlands.
*/
/* Some small additions for Apache --- ditch the "sccsid" var if
* compiling with gcc (it *has* changed), include ap_config.h for the
* prototypes it defines on at least one system (SunlOSs) which has
* them missing from the standard header files, and one minor change
* below (extra parens around assign "if (foo = bar) ..." to shut up
* gcc -Wall).
*/
/* Rewritten by David Robinson */
#include "httpd.h" /* for server_rec, conn_rec, ap_longjmp, etc. */
#include "http_log.h" /* for aplog_error */
#include "rfc1413.h"
#include "http_main.h" /* set_callback_and_alarm */
#include "apr_network_io.h"
/* Local stuff. */
/* Semi-well-known port */
#define RFC1413_PORT 113
/* maximum allowed length of userid */
#define RFC1413_USERLEN 512
/* rough limit on the amount of data we accept. */
#define RFC1413_MAXDATA 1000
#ifndef RFC1413_TIMEOUT
#define RFC1413_TIMEOUT 30
#endif
#define ANY_PORT 0 /* Any old port will do */
#define FROM_UNKNOWN "unknown"
int ap_rfc1413_timeout = RFC1413_TIMEOUT; /* Global so it can be changed */
static JMP_BUF timebuf;
/* bind_connect - bind both ends of a socket */
/* Ambarish fix this. Very broken */
static int get_rfc1413(ap_socket_t *sock, const char *local_ip,
const char *rmt_ip,
char user[RFC1413_USERLEN+1], server_rec *srv)
{
unsigned int rmt_port, our_port;
unsigned int sav_rmt_port, sav_our_port;
ap_status_t status;
int i;
char *cp;
char buffer[RFC1413_MAXDATA + 1];
int buflen;
/*
* Bind the local and remote ends of the query socket to the same
* IP addresses as the connection under investigation. We go
* through all this trouble because the local or remote system
* might have more than one network address. The RFC1413 etc.
* client sends only port numbers; the server takes the IP
* addresses from the query socket.
*/
ap_set_local_port(sock, ANY_PORT);
ap_set_local_ipaddr(sock, local_ip);
if ((status = ap_bind(sock)) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, status, srv,
"bind: rfc1413: Error binding to local port");
return -1;
}
ap_get_local_port(&sav_our_port, sock);
/*
* errors from connect usually imply the remote machine doesn't support
* the service
*/
ap_set_remote_port(sock, RFC1413_PORT);
ap_set_remote_ipaddr(sock, rmt_ip);
if (ap_connect(sock, NULL) != APR_SUCCESS)
return -1;
ap_get_remote_port(&sav_rmt_port, sock);
/* send the data */
buflen = ap_snprintf(buffer, sizeof(buffer), "%u,%u\r\n", sav_rmt_port,
sav_our_port);
/* send query to server. Handle short write. */
#ifdef CHARSET_EBCDIC
ebcdic2ascii(&buffer, &buffer, buflen);
#endif
i = 0;
while(i < strlen(buffer)) {
int j = strlen(buffer + i);
ap_status_t status;
status = ap_send(sock, buffer+i, &j);
if (status != APR_SUCCESS && status != APR_EINTR) {
ap_log_error(APLOG_MARK, APLOG_CRIT, status, srv,
"write: rfc1413: error sending request");
return -1;
}
else if (j > 0) {
i+=j;
}
}
/*
* Read response from server. - the response should be newline
* terminated according to rfc - make sure it doesn't stomp it's
* way out of the buffer.
*/
i = 0;
memset(buffer, '\0', sizeof(buffer));
/*
* Note that the strchr function below checks for 10 instead of '\n'
* this allows it to work on both ASCII and EBCDIC machines.
*/
while((cp = strchr(buffer, '\012')) == NULL && i < sizeof(buffer) - 1) {
int j = sizeof(buffer) - 1 - i;
ap_status_t status;
status = ap_recv(sock, buffer+i, &j);
if (status != APR_SUCCESS && status != APR_EINTR) {
ap_log_error(APLOG_MARK, APLOG_CRIT, status, srv,
"read: rfc1413: error reading response");
return -1;
}
else if (j > 0) {
i+=j;
}
}
/* RFC1413_USERLEN = 512 */
#ifdef CHARSET_EBCDIC
ascii2ebcdic(&buffer, &buffer, (size_t)i);
#endif
if (sscanf(buffer, "%u , %u : USERID :%*[^:]:%512s", &rmt_port, &our_port,
user) != 3 || sav_rmt_port != rmt_port
|| sav_our_port != our_port)
return -1;
/*
* Strip trailing carriage return. It is part of the
* protocol, not part of the data.
*/
if ((cp = strchr(user, '\r')))
*cp = '\0';
return 0;
}
/* rfc1413 - return remote user name, given socket structures */
char *ap_rfc1413(conn_rec *conn, server_rec *srv)
{
ap_status_t status;
static char user[RFC1413_USERLEN + 1]; /* XXX */
static char *result;
static ap_socket_t *sock;
result = FROM_UNKNOWN;
if ((status = ap_create_tcp_socket(&sock, conn->pool)) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, status, srv,
"socket: rfc1413: error creating socket");
conn->remote_logname = result;
}
/*
* Set up a timer so we won't get stuck while waiting for the server.
*/
if (ap_setjmp(timebuf) == 0) {
if (get_rfc1413(sock, conn->local_ip, conn->remote_ip, user, srv) >= 0)
result = user;
}
ap_close_socket(sock);
conn->remote_logname = result;
return conn->remote_logname;
}