/* Copyright 1999-2005 The Apache Software Foundation or its licensors, as
* applicable.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* 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"
#include "apr_inherit.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->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->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_socket_timeout_set(*newsock, apr_time_from_sec(ap_rfc1413_timeout)))
!= 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_port_get(&sav_our_port, conn->local_addr);
apr_sockaddr_port_get(&sav_rmt_port, conn->remote_addr);
/* 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;
}
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