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-rw-r--r--server/rfc1413.c288
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diff --git a/server/rfc1413.c b/server/rfc1413.c
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-/* ====================================================================
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 2000-2001 The Apache Software Foundation. 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. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Apache" and "Apache Software Foundation" 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 name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``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 SOFTWARE FOUNDATION 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 Software Foundation. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- *
- * Portions of this software are based upon public domain software
- * originally written at the National Center for Supercomputing Applications,
- * University of Illinois, Urbana-Champaign.
- */
-
-/* TODO - put timeouts back in */
-/*
- * 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 "apr.h"
-#include "apr_network_io.h"
-#include "apr_strings.h"
-#include "apr_lib.h"
-
-#define APR_WANT_STDIO
-#define APR_WANT_STRFUNC
-#include "apr_want.h"
-
-#include "ap_config.h"
-#include "httpd.h" /* for server_rec, conn_rec, etc. */
-#include "http_log.h" /* for aplog_error */
-#include "rfc1413.h"
-#include "http_main.h" /* set_callback_and_alarm */
-#include "util_ebcdic.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 FROM_UNKNOWN "unknown"
-
-int ap_rfc1413_timeout = RFC1413_TIMEOUT; /* Global so it can be changed */
-
-static apr_status_t rfc1413_connect(apr_socket_t **newsock, conn_rec *conn,
- server_rec *srv)
-{
- apr_status_t rv;
- apr_sockaddr_t *localsa, *destsa;
-
- if ((rv = apr_sockaddr_info_get(&localsa, conn->local_ip, APR_UNSPEC,
- 0, /* ephemeral port */
- 0, conn->pool)) != APR_SUCCESS) {
- /* This should not fail since we have a numeric address string
- * as the host. */
- ap_log_error(APLOG_MARK, APLOG_CRIT, rv, srv,
- "rfc1413: apr_sockaddr_info_get(%s) failed",
- conn->local_ip);
- return rv;
- }
-
- if ((rv = apr_sockaddr_info_get(&destsa, conn->remote_ip,
- localsa->sa.sin.sin_family, /* has to match */
- RFC1413_PORT, 0, conn->pool)) != APR_SUCCESS) {
- /* This should not fail since we have a numeric address string
- * as the host. */
- ap_log_error(APLOG_MARK, APLOG_CRIT, rv, srv,
- "rfc1413: apr_sockaddr_info_get(%s) failed",
- conn->remote_ip);
- return rv;
- }
-
- if ((rv = apr_socket_create(newsock,
- localsa->sa.sin.sin_family, /* has to match */
- SOCK_STREAM, conn->pool)) != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_CRIT, rv, srv,
- "rfc1413: error creating query socket");
- return rv;
- }
-
- if ((rv = apr_setsocketopt(*newsock, APR_SO_TIMEOUT,
- (apr_int32_t)(ap_rfc1413_timeout
- * APR_USEC_PER_SEC)))
- != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_CRIT, rv, srv,
- "rfc1413: error setting query socket timeout");
- apr_socket_close(*newsock);
- return rv;
- }
-
-/*
- * 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.
- */
-
- if ((rv = apr_bind(*newsock, localsa)) != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_CRIT, rv, srv,
- "rfc1413: Error binding query socket to local port");
- apr_socket_close(*newsock);
- return rv;
- }
-
-/*
- * errors from connect usually imply the remote machine doesn't support
- * the service; don't log such an error
- */
- if ((rv = apr_connect(*newsock, destsa)) != APR_SUCCESS) {
- apr_socket_close(*newsock);
- return rv;
- }
-
- return APR_SUCCESS;
-}
-
-static apr_status_t rfc1413_query(apr_socket_t *sock, conn_rec *conn,
- server_rec *srv)
-{
- apr_port_t rmt_port, our_port;
- apr_port_t sav_rmt_port, sav_our_port;
- apr_size_t i;
- char *cp;
- char buffer[RFC1413_MAXDATA + 1];
- char user[RFC1413_USERLEN + 1]; /* XXX */
- apr_size_t buflen;
- apr_sockaddr_t *localsa;
-
- apr_socket_addr_get(&localsa, APR_LOCAL, sock);
- apr_sockaddr_port_get(&sav_our_port, localsa);
- sav_rmt_port = RFC1413_PORT;
-
- /* send the data */
- buflen = apr_snprintf(buffer, sizeof(buffer), "%hu,%hu\r\n", sav_rmt_port,
- sav_our_port);
- ap_xlate_proto_to_ascii(buffer, buflen);
-
- /* send query to server. Handle short write. */
- i = 0;
- while (i < buflen) {
- apr_size_t j = strlen(buffer + i);
- apr_status_t status;
- status = apr_send(sock, buffer+i, &j);
- if (status != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_CRIT, status, srv,
- "write: rfc1413: error sending request");
- return status;
- }
- 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 its
- * way out of the buffer.
- */
-
- i = 0;
- memset(buffer, '\0', sizeof(buffer));
- /*
- * Note that the strchr function below checks for \012 instead of '\n'
- * this allows it to work on both ASCII and EBCDIC machines.
- */
- while((cp = strchr(buffer, '\012')) == NULL && i < sizeof(buffer) - 1) {
- apr_size_t j = sizeof(buffer) - 1 - i;
- apr_status_t status;
- status = apr_recv(sock, buffer+i, &j);
- if (status != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_CRIT, status, srv,
- "read: rfc1413: error reading response");
- return status;
- }
- else if (j > 0) {
- i+=j;
- }
- else if (status == APR_SUCCESS && j == 0) {
- /* Oops... we ran out of data before finding newline */
- return APR_EINVAL;
- }
- }
-
-/* RFC1413_USERLEN = 512 */
- ap_xlate_proto_from_ascii(buffer, i);
- if (sscanf(buffer, "%hu , %hu : USERID :%*[^:]:%512s", &rmt_port, &our_port,
- user) != 3 || sav_rmt_port != rmt_port
- || sav_our_port != our_port)
- return APR_EINVAL;
-
- /*
- * Strip trailing carriage return. It is part of the
- * protocol, not part of the data.
- */
-
- if ((cp = strchr(user, '\r')))
- *cp = '\0';
-
- conn->remote_logname = apr_pstrdup(conn->pool, user);
-
- return APR_SUCCESS;
-}
-
-char *ap_rfc1413(conn_rec *conn, server_rec *srv)
-{
- apr_socket_t *sock;
- apr_status_t rv;
-
- rv = rfc1413_connect(&sock, conn, srv);
- if (rv == APR_SUCCESS) {
- rv = rfc1413_query(sock, conn, srv);
- apr_socket_close(sock);
- }
- if (rv != APR_SUCCESS) {
- conn->remote_logname = FROM_UNKNOWN;
- }
- return conn->remote_logname;
-}