1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000 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 "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 "apr_network_io.h"
#include <string.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 */
/* 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)) {
ap_ssize_t 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) {
ap_ssize_t 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;
}
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;
}
|
