tcpd{chk,match}(8): Raise WARNS to 2 and fix warnings.
[dragonfly.git] / contrib / tcp_wrappers / tcpdchk.c
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1 /*
2 * tcpdchk - examine all tcpd access control rules and inetd.conf entries
3 *
4 * Usage: tcpdchk [-a] [-d] [-i inet_conf] [-v]
5 *
6 * -a: complain about implicit "allow" at end of rule.
7 *
8 * -d: rules in current directory.
9 *
10 * -i: location of inetd.conf file.
11 *
12 * -v: show all rules.
13 *
14 * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
15 *
16 * $FreeBSD: src/contrib/tcp_wrappers/tcpdchk.c,v 1.3.2.1 2000/07/18 08:34:55 ume Exp $
17 */
18
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19/* System libraries. */
20
21#include <sys/types.h>
22#include <sys/stat.h>
23#ifdef INET6
24#include <sys/socket.h>
25#endif
26#include <netinet/in.h>
27#include <arpa/inet.h>
28#include <stdio.h>
29#include <syslog.h>
30#include <setjmp.h>
31#include <errno.h>
32#include <netdb.h>
33#include <string.h>
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34#include <stdlib.h>
35#include <unistd.h>
984263bc 36
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37extern void exit();
38extern int optind;
39extern char *optarg;
40
41#ifndef INADDR_NONE
42#define INADDR_NONE (-1) /* XXX should be 0xffffffff */
43#endif
44
45#ifndef S_ISDIR
46#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
47#endif
48
49/* Application-specific. */
50
51#include "tcpd.h"
52#include "inetcf.h"
53#include "scaffold.h"
54
55 /*
56 * Stolen from hosts_access.c...
57 */
58static char sep[] = ", \t\n";
59
60#define BUFLEN 2048
61
62int resident = 0;
63int hosts_access_verbose = 0;
64char *hosts_allow_table = HOSTS_ALLOW;
65char *hosts_deny_table = HOSTS_DENY;
66extern jmp_buf tcpd_buf;
67
68 /*
69 * Local stuff.
70 */
71static void usage();
72static void parse_table();
73static void print_list();
74static void check_daemon_list();
75static void check_client_list();
76static void check_daemon();
77static void check_user();
78static int check_host();
79static int reserved_name();
80
81#define PERMIT 1
82#define DENY 0
83
84#define YES 1
85#define NO 0
86
87static int defl_verdict;
88static char *myname;
89static int allow_check;
90static char *inetcf;
91
92int main(argc, argv)
93int argc;
94char **argv;
95{
96 struct request_info request;
97 struct stat st;
98 int c;
99
100 myname = argv[0];
101
102 /*
103 * Parse the JCL.
104 */
105 while ((c = getopt(argc, argv, "adi:v")) != EOF) {
106 switch (c) {
107 case 'a':
108 allow_check = 1;
109 break;
110 case 'd':
111 hosts_allow_table = "hosts.allow";
112 hosts_deny_table = "hosts.deny";
113 break;
114 case 'i':
115 inetcf = optarg;
116 break;
117 case 'v':
118 hosts_access_verbose++;
119 break;
120 default:
121 usage();
122 /* NOTREACHED */
123 }
124 }
125 if (argc != optind)
126 usage();
127
128 /*
129 * When confusion really strikes...
130 */
131 if (check_path(REAL_DAEMON_DIR, &st) < 0) {
132 tcpd_warn("REAL_DAEMON_DIR %s: %m", REAL_DAEMON_DIR);
133 } else if (!S_ISDIR(st.st_mode)) {
134 tcpd_warn("REAL_DAEMON_DIR %s is not a directory", REAL_DAEMON_DIR);
135 }
136
137 /*
138 * Process the inet configuration file (or its moral equivalent). This
139 * information is used later to find references in hosts.allow/deny to
140 * unwrapped services, and other possible problems.
141 */
142 inetcf = inet_cfg(inetcf);
143 if (hosts_access_verbose)
144 printf("Using network configuration file: %s\n", inetcf);
145
146 /*
147 * These are not run from inetd but may have built-in access control.
148 */
149 inet_set("portmap", WR_NOT);
150 inet_set("rpcbind", WR_NOT);
151
152 /*
153 * Check accessibility of access control files.
154 */
155 (void) check_path(hosts_allow_table, &st);
156 (void) check_path(hosts_deny_table, &st);
157
158 /*
159 * Fake up an arbitrary service request.
160 */
161 request_init(&request,
162 RQ_DAEMON, "daemon_name",
163 RQ_SERVER_NAME, "server_hostname",
164 RQ_SERVER_ADDR, "server_addr",
165 RQ_USER, "user_name",
166 RQ_CLIENT_NAME, "client_hostname",
167 RQ_CLIENT_ADDR, "client_addr",
168 RQ_FILE, 1,
169 0);
170
171 /*
172 * Examine all access-control rules.
173 */
174 defl_verdict = PERMIT;
175 parse_table(hosts_allow_table, &request);
176 defl_verdict = DENY;
177 parse_table(hosts_deny_table, &request);
178 return (0);
179}
180
181/* usage - explain */
182
183static void usage()
184{
185 fprintf(stderr, "usage: %s [-a] [-d] [-i inet_conf] [-v]\n", myname);
186 fprintf(stderr, " -a: report rules with implicit \"ALLOW\" at end\n");
187 fprintf(stderr, " -d: use allow/deny files in current directory\n");
188 fprintf(stderr, " -i: location of inetd.conf file\n");
189 fprintf(stderr, " -v: list all rules\n");
190 exit(1);
191}
192
193/* parse_table - like table_match(), but examines _all_ entries */
194
195static void parse_table(table, request)
196char *table;
197struct request_info *request;
198{
199 FILE *fp;
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200 char sv_list[BUFLEN]; /* becomes list of daemons */
201 char *cl_list; /* becomes list of requests */
202 char *sh_cmd; /* becomes optional shell command */
203 char buf[BUFSIZ];
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204#ifdef PROCESS_OPTIONS
205 int real_verdict, verdict;
206#endif
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207 struct tcpd_context saved_context;
208
209 saved_context = tcpd_context; /* stupid compilers */
210
ae9447bd 211 if ((fp = fopen(table, "r")) != NULL) {
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212 tcpd_context.file = table;
213 tcpd_context.line = 0;
214 while (xgets(sv_list, sizeof(sv_list), fp)) {
215 if (sv_list[strlen(sv_list) - 1] != '\n') {
216 tcpd_warn("missing newline or line too long");
217 continue;
218 }
219 if (sv_list[0] == '#' || sv_list[strspn(sv_list, " \t\r\n")] == 0)
220 continue;
221 if ((cl_list = split_at(sv_list, ':')) == 0) {
222 tcpd_warn("missing \":\" separator");
223 continue;
224 }
225 sh_cmd = split_at(cl_list, ':');
226
227 if (hosts_access_verbose)
228 printf("\n>>> Rule %s line %d:\n",
229 tcpd_context.file, tcpd_context.line);
230
231 if (hosts_access_verbose)
232 print_list("daemons: ", sv_list);
233 check_daemon_list(sv_list);
234
235 if (hosts_access_verbose)
236 print_list("clients: ", cl_list);
237 check_client_list(cl_list);
238
239#ifdef PROCESS_OPTIONS
240 real_verdict = defl_verdict;
241 if (sh_cmd) {
242 verdict = setjmp(tcpd_buf);
243 if (verdict != 0) {
244 real_verdict = (verdict == AC_PERMIT);
245 } else {
246 dry_run = 1;
247 process_options(sh_cmd, request);
248 if (dry_run == 1 && real_verdict && allow_check)
249 tcpd_warn("implicit \"allow\" at end of rule");
250 }
251 } else if (defl_verdict && allow_check) {
252 tcpd_warn("implicit \"allow\" at end of rule");
253 }
254 if (hosts_access_verbose)
255 printf("access: %s\n", real_verdict ? "granted" : "denied");
256#else
257 if (sh_cmd)
258 shell_cmd(percent_x(buf, sizeof(buf), sh_cmd, request));
259 if (hosts_access_verbose)
260 printf("access: %s\n", defl_verdict ? "granted" : "denied");
261#endif
262 }
263 (void) fclose(fp);
264 } else if (errno != ENOENT) {
265 tcpd_warn("cannot open %s: %m", table);
266 }
267 tcpd_context = saved_context;
268}
269
270/* print_list - pretty-print a list */
271
272static void print_list(title, list)
273char *title;
274char *list;
275{
276 char buf[BUFLEN];
277 char *cp;
278 char *next;
279
280 fputs(title, stdout);
281 strcpy(buf, list);
282
283 for (cp = strtok(buf, sep); cp != 0; cp = next) {
284 fputs(cp, stdout);
285 next = strtok((char *) 0, sep);
286 if (next != 0)
287 fputs(" ", stdout);
288 }
289 fputs("\n", stdout);
290}
291
292/* check_daemon_list - criticize daemon list */
293
294static void check_daemon_list(list)
295char *list;
296{
297 char buf[BUFLEN];
298 char *cp;
299 char *host;
300 int daemons = 0;
301
302 strcpy(buf, list);
303
304 for (cp = strtok(buf, sep); cp != 0; cp = strtok((char *) 0, sep)) {
305 if (STR_EQ(cp, "EXCEPT")) {
306 daemons = 0;
307 } else {
308 daemons++;
309 if ((host = split_at(cp + 1, '@')) != 0 && check_host(host) > 1) {
310 tcpd_warn("host %s has more than one address", host);
311 tcpd_warn("(consider using an address instead)");
312 }
313 check_daemon(cp);
314 }
315 }
316 if (daemons == 0)
317 tcpd_warn("daemon list is empty or ends in EXCEPT");
318}
319
320/* check_client_list - criticize client list */
321
322static void check_client_list(list)
323char *list;
324{
325 char buf[BUFLEN];
326 char *cp;
327 char *host;
328 int clients = 0;
329
330 strcpy(buf, list);
331
332 for (cp = strtok(buf, sep); cp != 0; cp = strtok((char *) 0, sep)) {
333 if (STR_EQ(cp, "EXCEPT")) {
334 clients = 0;
335 } else {
336 clients++;
ae9447bd 337 if ((host = split_at(cp + 1, '@')) != NULL) { /* user@host */
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338 check_user(cp);
339 check_host(host);
340 } else {
341 check_host(cp);
342 }
343 }
344 }
345 if (clients == 0)
346 tcpd_warn("client list is empty or ends in EXCEPT");
347}
348
349/* check_daemon - criticize daemon pattern */
350
351static void check_daemon(pat)
352char *pat;
353{
354 if (pat[0] == '@') {
355 tcpd_warn("%s: daemon name begins with \"@\"", pat);
356 } else if (pat[0] == '/') {
357 tcpd_warn("%s: daemon name begins with \"/\"", pat);
358 } else if (pat[0] == '.') {
359 tcpd_warn("%s: daemon name begins with dot", pat);
360 } else if (pat[strlen(pat) - 1] == '.') {
361 tcpd_warn("%s: daemon name ends in dot", pat);
362 } else if (STR_EQ(pat, "ALL") || STR_EQ(pat, unknown)) {
363 /* void */ ;
364 } else if (STR_EQ(pat, "FAIL")) { /* obsolete */
365 tcpd_warn("FAIL is no longer recognized");
366 tcpd_warn("(use EXCEPT or DENY instead)");
367 } else if (reserved_name(pat)) {
368 tcpd_warn("%s: daemon name may be reserved word", pat);
369 } else {
370 switch (inet_get(pat)) {
371 case WR_UNKNOWN:
372 tcpd_warn("%s: no such process name in %s", pat, inetcf);
373 inet_set(pat, WR_YES); /* shut up next time */
374 break;
375 case WR_NOT:
376 tcpd_warn("%s: service possibly not wrapped", pat);
377 inet_set(pat, WR_YES);
378 break;
379 }
380 }
381}
382
383/* check_user - criticize user pattern */
384
385static void check_user(pat)
386char *pat;
387{
388 if (pat[0] == '@') { /* @netgroup */
389 tcpd_warn("%s: user name begins with \"@\"", pat);
390 } else if (pat[0] == '/') {
391 tcpd_warn("%s: user name begins with \"/\"", pat);
392 } else if (pat[0] == '.') {
393 tcpd_warn("%s: user name begins with dot", pat);
394 } else if (pat[strlen(pat) - 1] == '.') {
395 tcpd_warn("%s: user name ends in dot", pat);
396 } else if (STR_EQ(pat, "ALL") || STR_EQ(pat, unknown)
397 || STR_EQ(pat, "KNOWN")) {
398 /* void */ ;
399 } else if (STR_EQ(pat, "FAIL")) { /* obsolete */
400 tcpd_warn("FAIL is no longer recognized");
401 tcpd_warn("(use EXCEPT or DENY instead)");
402 } else if (reserved_name(pat)) {
403 tcpd_warn("%s: user name may be reserved word", pat);
404 }
405}
406
407#ifdef INET6
408static int is_inet6_addr(pat)
409 char *pat;
410{
411 struct addrinfo hints, *res;
412 int len, ret;
413 char ch;
414
415 if (*pat != '[')
416 return (0);
417 len = strlen(pat);
418 if ((ch = pat[len - 1]) != ']')
419 return (0);
420 pat[len - 1] = '\0';
421 memset(&hints, 0, sizeof(hints));
422 hints.ai_family = AF_INET6;
423 hints.ai_socktype = SOCK_STREAM;
424 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
425 if ((ret = getaddrinfo(pat + 1, NULL, &hints, &res)) == 0)
426 freeaddrinfo(res);
427 pat[len - 1] = ch;
428 return (ret == 0);
429}
430#endif
431
432/* check_host - criticize host pattern */
433
434static int check_host(pat)
435char *pat;
436{
437 char buf[BUFSIZ];
438 char *mask;
439 int addr_count = 1;
440 FILE *fp;
441 struct tcpd_context saved_context;
442 char *cp;
443 char *wsp = " \t\r\n";
444
445 if (pat[0] == '@') { /* @netgroup */
446#ifdef NO_NETGRENT
447 /* SCO has no *netgrent() support */
448#else
449#ifdef NETGROUP
450 char *machinep;
451 char *userp;
452 char *domainp;
453
454 setnetgrent(pat + 1);
455 if (getnetgrent(&machinep, &userp, &domainp) == 0)
456 tcpd_warn("%s: unknown or empty netgroup", pat + 1);
457 endnetgrent();
458#else
459 tcpd_warn("netgroup support disabled");
460#endif
461#endif
462 } else if (pat[0] == '/') { /* /path/name */
463 if ((fp = fopen(pat, "r")) != 0) {
464 saved_context = tcpd_context;
465 tcpd_context.file = pat;
466 tcpd_context.line = 0;
467 while (fgets(buf, sizeof(buf), fp)) {
468 tcpd_context.line++;
469 for (cp = strtok(buf, wsp); cp; cp = strtok((char *) 0, wsp))
470 check_host(cp);
471 }
472 tcpd_context = saved_context;
473 fclose(fp);
474 } else if (errno != ENOENT) {
475 tcpd_warn("open %s: %m", pat);
476 }
ae9447bd 477 } else if ((mask = split_at(pat, '/')) != NULL) { /* network/netmask */
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478#ifdef INET6
479 int mask_len;
480
481 if ((dot_quad_addr(pat) == INADDR_NONE
482 || dot_quad_addr(mask) == INADDR_NONE)
483 && (!is_inet6_addr(pat)
484 || ((mask_len = atoi(mask)) < 0 || mask_len > 128)))
485#else
486 if (dot_quad_addr(pat) == INADDR_NONE
487 || dot_quad_addr(mask) == INADDR_NONE)
488#endif
489 tcpd_warn("%s/%s: bad net/mask pattern", pat, mask);
490 } else if (STR_EQ(pat, "FAIL")) { /* obsolete */
491 tcpd_warn("FAIL is no longer recognized");
492 tcpd_warn("(use EXCEPT or DENY instead)");
493 } else if (reserved_name(pat)) { /* other reserved */
494 /* void */ ;
495#ifdef INET6
496 } else if (is_inet6_addr(pat)) { /* IPv6 address */
497 addr_count = 1;
498#endif
499 } else if (NOT_INADDR(pat)) { /* internet name */
500 if (pat[strlen(pat) - 1] == '.') {
501 tcpd_warn("%s: domain or host name ends in dot", pat);
502 } else if (pat[0] != '.') {
503 addr_count = check_dns(pat);
504 }
505 } else { /* numeric form */
506 if (STR_EQ(pat, "0.0.0.0") || STR_EQ(pat, "255.255.255.255")) {
507 /* void */ ;
508 } else if (pat[0] == '.') {
509 tcpd_warn("%s: network number begins with dot", pat);
510 } else if (pat[strlen(pat) - 1] != '.') {
511 check_dns(pat);
512 }
513 }
514 return (addr_count);
515}
516
517/* reserved_name - determine if name is reserved */
518
519static int reserved_name(pat)
520char *pat;
521{
522 return (STR_EQ(pat, unknown)
523 || STR_EQ(pat, "KNOWN")
524 || STR_EQ(pat, paranoid)
525 || STR_EQ(pat, "ALL")
526 || STR_EQ(pat, "LOCAL"));
527}