1 /*
2 * tcpdmatch - explain what tcpd would do in a specific case
3 *
4 * usage: tcpdmatch [-d] [-i inet_conf] daemon[@host] [user@]host
5 *
6 * -d: use the access control tables in the current directory.
7 *
8 * -i: location of inetd.conf file.
9 *
10 * All errors are reported to the standard error stream, including the errors
11 * that would normally be reported via the syslog daemon.
12 *
13 * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
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14 *
15 * $FreeBSD: head/contrib/tcp_wrappers/tcpdmatch.c 56977 2000-02-03 10:27:03Z shin $ |
16 */
17
18#ifndef lint
19static char sccsid[] = "@(#) tcpdmatch.c 1.5 96/02/11 17:01:36";
20#endif
21
22/* System libraries. */
23
24#include <sys/types.h>
25#include <sys/stat.h>
26#include <sys/socket.h>
27#include <netinet/in.h>
28#include <arpa/inet.h>
29#include <netdb.h>
30#include <stdio.h>
31#include <syslog.h>
32#include <setjmp.h>
33#include <string.h>
34
35extern void exit();
36extern int optind;
37extern char *optarg;
38
39#ifndef INADDR_NONE
40#define INADDR_NONE (-1) /* XXX should be 0xffffffff */
41#endif
42
43#ifndef S_ISDIR
44#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
45#endif
46
47/* Application-specific. */
48
49#include "tcpd.h"
50#include "inetcf.h"
51#include "scaffold.h"
52
53static void usage();
54static void tcpdmatch();
55
56/* The main program */
57
58int main(argc, argv)
59int argc;
60char **argv;
61{
62 struct hostent *hp;
63 char *myname = argv[0];
64 char *client;
65 char *server;
66 char *addr;
67 char *user;
68 char *daemon;
69 struct request_info request;
70 int ch;
71 char *inetcf = 0;
72 int count;
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73#ifdef INET6
74 struct sockaddr_storage server_sin;
75 struct sockaddr_storage client_sin;
76 char *ap;
77 int alen;
78#else |
79 struct sockaddr_in server_sin;
80 struct sockaddr_in client_sin;
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| 81#endif |
82 struct stat st;
83
84 /*
85 * Show what rule actually matched.
86 */
87 hosts_access_verbose = 2;
88
89 /*
90 * Parse the JCL.
91 */
92 while ((ch = getopt(argc, argv, "di:")) != EOF) {
93 switch (ch) {
94 case 'd':
95 hosts_allow_table = "hosts.allow";
96 hosts_deny_table = "hosts.deny";
97 break;
98 case 'i':
99 inetcf = optarg;
100 break;
101 default:
102 usage(myname);
103 /* NOTREACHED */
104 }
105 }
106 if (argc != optind + 2)
107 usage(myname);
108
109 /*
110 * When confusion really strikes...
111 */
112 if (check_path(REAL_DAEMON_DIR, &st) < 0) {
113 tcpd_warn("REAL_DAEMON_DIR %s: %m", REAL_DAEMON_DIR);
114 } else if (!S_ISDIR(st.st_mode)) {
115 tcpd_warn("REAL_DAEMON_DIR %s is not a directory", REAL_DAEMON_DIR);
116 }
117
118 /*
119 * Default is to specify a daemon process name. When daemon@host is
120 * specified, separate the two parts.
121 */
122 if ((server = split_at(argv[optind], '@')) == 0)
123 server = unknown;
124 if (argv[optind][0] == '/') {
125 daemon = strrchr(argv[optind], '/') + 1;
126 tcpd_warn("%s: daemon name normalized to: %s", argv[optind], daemon);
127 } else {
128 daemon = argv[optind];
129 }
130
131 /*
132 * Default is to specify a client hostname or address. When user@host is
133 * specified, separate the two parts.
134 */
135 if ((client = split_at(argv[optind + 1], '@')) != 0) {
136 user = argv[optind + 1];
137 } else {
138 client = argv[optind + 1];
139 user = unknown;
140 }
141
142 /*
143 * Analyze the inetd (or tlid) configuration file, so that we can warn
144 * the user about services that may not be wrapped, services that are not
145 * configured, or services that are wrapped in an incorrect manner. Allow
146 * for services that are not run from inetd, or that have tcpd access
147 * control built into them.
148 */
149 inetcf = inet_cfg(inetcf);
150 inet_set("portmap", WR_NOT);
151 inet_set("rpcbind", WR_NOT);
152 switch (inet_get(daemon)) {
153 case WR_UNKNOWN:
154 tcpd_warn("%s: no such process name in %s", daemon, inetcf);
155 break;
156 case WR_NOT:
157 tcpd_warn("%s: service possibly not wrapped", daemon);
158 break;
159 }
160
161 /*
162 * Check accessibility of access control files.
163 */
164 (void) check_path(hosts_allow_table, &st);
165 (void) check_path(hosts_deny_table, &st);
166
167 /*
168 * Fill in what we have figured out sofar. Use socket and DNS routines
169 * for address and name conversions. We attach stdout to the request so
170 * that banner messages will become visible.
171 */
172 request_init(&request, RQ_DAEMON, daemon, RQ_USER, user, RQ_FILE, 1, 0);
173 sock_methods(&request);
174
175 /*
176 * If a server hostname is specified, insist that the name maps to at
177 * most one address. eval_hostname() warns the user about name server
178 * problems, while using the request.server structure as a cache for host
179 * address and name conversion results.
180 */
181 if (NOT_INADDR(server) == 0 || HOSTNAME_KNOWN(server)) {
182 if ((hp = find_inet_addr(server)) == 0)
183 exit(1);
184 memset((char *) &server_sin, 0, sizeof(server_sin));
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185#ifdef INET6
186 server_sin.ss_family = hp->h_addrtype;
187 switch (hp->h_addrtype) {
188 case AF_INET:
189 ap = (char *)&((struct sockaddr_in *)&server_sin)->sin_addr;
190 alen = sizeof(struct sockaddr_in);
191 break;
192 case AF_INET6:
193 ap = (char *)&((struct sockaddr_in6 *)&server_sin)->sin6_addr;
194 alen = sizeof(struct sockaddr_in6);
195 break;
196 default:
197 exit(1);
198 }
199#ifdef SIN6_LEN
200 server_sin.ss_len = alen;
201#endif
202#else |
203 server_sin.sin_family = AF_INET;
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| 204#endif |
205 request_set(&request, RQ_SERVER_SIN, &server_sin, 0);
206
207 for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
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208#ifdef INET6
209 memcpy(ap, addr, alen);
210#else |
211 memcpy((char *) &server_sin.sin_addr, addr,
212 sizeof(server_sin.sin_addr));
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| 213#endif |
214
215 /*
216 * Force evaluation of server host name and address. Host name
217 * conflicts will be reported while eval_hostname() does its job.
218 */
219 request_set(&request, RQ_SERVER_NAME, "", RQ_SERVER_ADDR, "", 0);
220 if (STR_EQ(eval_hostname(request.server), unknown))
221 tcpd_warn("host address %s->name lookup failed",
222 eval_hostaddr(request.server));
223 }
224 if (count > 1) {
225 fprintf(stderr, "Error: %s has more than one address\n", server);
226 fprintf(stderr, "Please specify an address instead\n");
227 exit(1);
228 }
229 free((char *) hp);
230 } else {
231 request_set(&request, RQ_SERVER_NAME, server, 0);
232 }
233
234 /*
235 * If a client address is specified, we simulate the effect of client
236 * hostname lookup failure.
237 */
238 if (dot_quad_addr(client) != INADDR_NONE) {
239 request_set(&request, RQ_CLIENT_ADDR, client, 0);
240 tcpdmatch(&request);
241 exit(0);
242 }
243
244 /*
245 * Perhaps they are testing special client hostname patterns that aren't
246 * really host names at all.
247 */
248 if (NOT_INADDR(client) && HOSTNAME_KNOWN(client) == 0) {
249 request_set(&request, RQ_CLIENT_NAME, client, 0);
250 tcpdmatch(&request);
251 exit(0);
252 }
253
254 /*
255 * Otherwise, assume that a client hostname is specified, and insist that
256 * the address can be looked up. The reason for this requirement is that
257 * in real life the client address is available (at least with IP). Let
258 * eval_hostname() figure out if this host is properly registered, while
259 * using the request.client structure as a cache for host name and
260 * address conversion results.
261 */
262 if ((hp = find_inet_addr(client)) == 0)
263 exit(1);
264 memset((char *) &client_sin, 0, sizeof(client_sin));
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265#ifdef INET6
266 client_sin.ss_family = hp->h_addrtype;
267 switch (hp->h_addrtype) {
268 case AF_INET:
269 ap = (char *)&((struct sockaddr_in *)&client_sin)->sin_addr;
270 alen = sizeof(struct sockaddr_in);
271 break;
272 case AF_INET6:
273 ap = (char *)&((struct sockaddr_in6 *)&client_sin)->sin6_addr;
274 alen = sizeof(struct sockaddr_in6);
275 break;
276 default:
277 exit(1);
278 }
279#ifdef SIN6_LEN
280 client_sin.ss_len = alen;
281#endif
282#else |
283 client_sin.sin_family = AF_INET;
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| 284#endif |
285 request_set(&request, RQ_CLIENT_SIN, &client_sin, 0);
286
287 for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
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288#ifdef INET6
289 memcpy(ap, addr, alen);
290#else |
291 memcpy((char *) &client_sin.sin_addr, addr,
292 sizeof(client_sin.sin_addr));
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| 293#endif |
294
295 /*
296 * Force evaluation of client host name and address. Host name
297 * conflicts will be reported while eval_hostname() does its job.
298 */
299 request_set(&request, RQ_CLIENT_NAME, "", RQ_CLIENT_ADDR, "", 0);
300 if (STR_EQ(eval_hostname(request.client), unknown))
301 tcpd_warn("host address %s->name lookup failed",
302 eval_hostaddr(request.client));
303 tcpdmatch(&request);
304 if (hp->h_addr_list[count + 1])
305 printf("\n");
306 }
307 free((char *) hp);
308 exit(0);
309}
310
311/* Explain how to use this program */
312
313static void usage(myname)
314char *myname;
315{
316 fprintf(stderr, "usage: %s [-d] [-i inet_conf] daemon[@host] [user@]host\n",
317 myname);
318 fprintf(stderr, " -d: use allow/deny files in current directory\n");
319 fprintf(stderr, " -i: location of inetd.conf file\n");
320 exit(1);
321}
322
323/* Print interesting expansions */
324
325static void expand(text, pattern, request)
326char *text;
327char *pattern;
328struct request_info *request;
329{
330 char buf[BUFSIZ];
331
332 if (STR_NE(percent_x(buf, sizeof(buf), pattern, request), unknown))
333 printf("%s %s\n", text, buf);
334}
335
336/* Try out a (server,client) pair */
337
338static void tcpdmatch(request)
339struct request_info *request;
340{
341 int verdict;
342
343 /*
344 * Show what we really know. Suppress uninteresting noise.
345 */
346 expand("client: hostname", "%n", request);
347 expand("client: address ", "%a", request);
348 expand("client: username", "%u", request);
349 expand("server: hostname", "%N", request);
350 expand("server: address ", "%A", request);
351 expand("server: process ", "%d", request);
352
353 /*
354 * Reset stuff that might be changed by options handlers. In dry-run
355 * mode, extension language routines that would not return should inform
356 * us of their plan, by clearing the dry_run flag. This is a bit clumsy
357 * but we must be able to verify hosts with more than one network
358 * address.
359 */
360 rfc931_timeout = RFC931_TIMEOUT;
361 allow_severity = SEVERITY;
362 deny_severity = LOG_WARNING;
363 dry_run = 1;
364
365 /*
366 * When paranoid mode is enabled, access is rejected no matter what the
367 * access control rules say.
368 */
369#ifdef PARANOID
370 if (STR_EQ(eval_hostname(request->client), paranoid)) {
371 printf("access: denied (PARANOID mode)\n\n");
372 return;
373 }
374#endif
375
376 /*
377 * Report the access control verdict.
378 */
379 verdict = hosts_access(request);
380 printf("access: %s\n",
381 dry_run == 0 ? "delegated" :
382 verdict ? "granted" : "denied");
383}
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