2 * tcpdchk - examine all tcpd access control rules and inetd.conf entries
4 * Usage: tcpdchk [-a] [-d] [-i inet_conf] [-v]
6 * -a: complain about implicit "allow" at end of rule.
8 * -d: rules in current directory.
10 * -i: location of inetd.conf file.
14 * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
16 * $FreeBSD: src/contrib/tcp_wrappers/tcpdchk.c,v 1.3.2.1 2000/07/18 08:34:55 ume Exp $
17 * $DragonFly: src/contrib/tcp_wrappers/tcpdchk.c,v 1.3 2005/04/29 01:00:27 joerg Exp $
21 static char sccsid[] = "@(#) tcpdchk.c 1.8 97/02/12 02:13:25";
24 /* System libraries. */
26 #include <sys/types.h>
29 #include <sys/socket.h>
31 #include <netinet/in.h>
32 #include <arpa/inet.h>
45 #define INADDR_NONE (-1) /* XXX should be 0xffffffff */
49 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
52 /* Application-specific. */
59 * Stolen from hosts_access.c...
61 static char sep[] = ", \t\n";
66 int hosts_access_verbose = 0;
67 char *hosts_allow_table = HOSTS_ALLOW;
68 char *hosts_deny_table = HOSTS_DENY;
69 extern jmp_buf tcpd_buf;
75 static void parse_table();
76 static void print_list();
77 static void check_daemon_list();
78 static void check_client_list();
79 static void check_daemon();
80 static void check_user();
81 static int check_host();
82 static int reserved_name();
90 static int defl_verdict;
92 static int allow_check;
99 struct request_info request;
108 while ((c = getopt(argc, argv, "adi:v")) != EOF) {
114 hosts_allow_table = "hosts.allow";
115 hosts_deny_table = "hosts.deny";
121 hosts_access_verbose++;
132 * When confusion really strikes...
134 if (check_path(REAL_DAEMON_DIR, &st) < 0) {
135 tcpd_warn("REAL_DAEMON_DIR %s: %m", REAL_DAEMON_DIR);
136 } else if (!S_ISDIR(st.st_mode)) {
137 tcpd_warn("REAL_DAEMON_DIR %s is not a directory", REAL_DAEMON_DIR);
141 * Process the inet configuration file (or its moral equivalent). This
142 * information is used later to find references in hosts.allow/deny to
143 * unwrapped services, and other possible problems.
145 inetcf = inet_cfg(inetcf);
146 if (hosts_access_verbose)
147 printf("Using network configuration file: %s\n", inetcf);
150 * These are not run from inetd but may have built-in access control.
152 inet_set("portmap", WR_NOT);
153 inet_set("rpcbind", WR_NOT);
156 * Check accessibility of access control files.
158 (void) check_path(hosts_allow_table, &st);
159 (void) check_path(hosts_deny_table, &st);
162 * Fake up an arbitrary service request.
164 request_init(&request,
165 RQ_DAEMON, "daemon_name",
166 RQ_SERVER_NAME, "server_hostname",
167 RQ_SERVER_ADDR, "server_addr",
168 RQ_USER, "user_name",
169 RQ_CLIENT_NAME, "client_hostname",
170 RQ_CLIENT_ADDR, "client_addr",
175 * Examine all access-control rules.
177 defl_verdict = PERMIT;
178 parse_table(hosts_allow_table, &request);
180 parse_table(hosts_deny_table, &request);
184 /* usage - explain */
188 fprintf(stderr, "usage: %s [-a] [-d] [-i inet_conf] [-v]\n", myname);
189 fprintf(stderr, " -a: report rules with implicit \"ALLOW\" at end\n");
190 fprintf(stderr, " -d: use allow/deny files in current directory\n");
191 fprintf(stderr, " -i: location of inetd.conf file\n");
192 fprintf(stderr, " -v: list all rules\n");
196 /* parse_table - like table_match(), but examines _all_ entries */
198 static void parse_table(table, request)
200 struct request_info *request;
204 char sv_list[BUFLEN]; /* becomes list of daemons */
205 char *cl_list; /* becomes list of requests */
206 char *sh_cmd; /* becomes optional shell command */
209 struct tcpd_context saved_context;
211 saved_context = tcpd_context; /* stupid compilers */
213 if (fp = fopen(table, "r")) {
214 tcpd_context.file = table;
215 tcpd_context.line = 0;
216 while (xgets(sv_list, sizeof(sv_list), fp)) {
217 if (sv_list[strlen(sv_list) - 1] != '\n') {
218 tcpd_warn("missing newline or line too long");
221 if (sv_list[0] == '#' || sv_list[strspn(sv_list, " \t\r\n")] == 0)
223 if ((cl_list = split_at(sv_list, ':')) == 0) {
224 tcpd_warn("missing \":\" separator");
227 sh_cmd = split_at(cl_list, ':');
229 if (hosts_access_verbose)
230 printf("\n>>> Rule %s line %d:\n",
231 tcpd_context.file, tcpd_context.line);
233 if (hosts_access_verbose)
234 print_list("daemons: ", sv_list);
235 check_daemon_list(sv_list);
237 if (hosts_access_verbose)
238 print_list("clients: ", cl_list);
239 check_client_list(cl_list);
241 #ifdef PROCESS_OPTIONS
242 real_verdict = defl_verdict;
244 verdict = setjmp(tcpd_buf);
246 real_verdict = (verdict == AC_PERMIT);
249 process_options(sh_cmd, request);
250 if (dry_run == 1 && real_verdict && allow_check)
251 tcpd_warn("implicit \"allow\" at end of rule");
253 } else if (defl_verdict && allow_check) {
254 tcpd_warn("implicit \"allow\" at end of rule");
256 if (hosts_access_verbose)
257 printf("access: %s\n", real_verdict ? "granted" : "denied");
260 shell_cmd(percent_x(buf, sizeof(buf), sh_cmd, request));
261 if (hosts_access_verbose)
262 printf("access: %s\n", defl_verdict ? "granted" : "denied");
266 } else if (errno != ENOENT) {
267 tcpd_warn("cannot open %s: %m", table);
269 tcpd_context = saved_context;
272 /* print_list - pretty-print a list */
274 static void print_list(title, list)
282 fputs(title, stdout);
285 for (cp = strtok(buf, sep); cp != 0; cp = next) {
287 next = strtok((char *) 0, sep);
294 /* check_daemon_list - criticize daemon list */
296 static void check_daemon_list(list)
306 for (cp = strtok(buf, sep); cp != 0; cp = strtok((char *) 0, sep)) {
307 if (STR_EQ(cp, "EXCEPT")) {
311 if ((host = split_at(cp + 1, '@')) != 0 && check_host(host) > 1) {
312 tcpd_warn("host %s has more than one address", host);
313 tcpd_warn("(consider using an address instead)");
319 tcpd_warn("daemon list is empty or ends in EXCEPT");
322 /* check_client_list - criticize client list */
324 static void check_client_list(list)
334 for (cp = strtok(buf, sep); cp != 0; cp = strtok((char *) 0, sep)) {
335 if (STR_EQ(cp, "EXCEPT")) {
339 if (host = split_at(cp + 1, '@')) { /* user@host */
348 tcpd_warn("client list is empty or ends in EXCEPT");
351 /* check_daemon - criticize daemon pattern */
353 static void check_daemon(pat)
357 tcpd_warn("%s: daemon name begins with \"@\"", pat);
358 } else if (pat[0] == '/') {
359 tcpd_warn("%s: daemon name begins with \"/\"", pat);
360 } else if (pat[0] == '.') {
361 tcpd_warn("%s: daemon name begins with dot", pat);
362 } else if (pat[strlen(pat) - 1] == '.') {
363 tcpd_warn("%s: daemon name ends in dot", pat);
364 } else if (STR_EQ(pat, "ALL") || STR_EQ(pat, unknown)) {
366 } else if (STR_EQ(pat, "FAIL")) { /* obsolete */
367 tcpd_warn("FAIL is no longer recognized");
368 tcpd_warn("(use EXCEPT or DENY instead)");
369 } else if (reserved_name(pat)) {
370 tcpd_warn("%s: daemon name may be reserved word", pat);
372 switch (inet_get(pat)) {
374 tcpd_warn("%s: no such process name in %s", pat, inetcf);
375 inet_set(pat, WR_YES); /* shut up next time */
378 tcpd_warn("%s: service possibly not wrapped", pat);
379 inet_set(pat, WR_YES);
385 /* check_user - criticize user pattern */
387 static void check_user(pat)
390 if (pat[0] == '@') { /* @netgroup */
391 tcpd_warn("%s: user name begins with \"@\"", pat);
392 } else if (pat[0] == '/') {
393 tcpd_warn("%s: user name begins with \"/\"", pat);
394 } else if (pat[0] == '.') {
395 tcpd_warn("%s: user name begins with dot", pat);
396 } else if (pat[strlen(pat) - 1] == '.') {
397 tcpd_warn("%s: user name ends in dot", pat);
398 } else if (STR_EQ(pat, "ALL") || STR_EQ(pat, unknown)
399 || STR_EQ(pat, "KNOWN")) {
401 } else if (STR_EQ(pat, "FAIL")) { /* obsolete */
402 tcpd_warn("FAIL is no longer recognized");
403 tcpd_warn("(use EXCEPT or DENY instead)");
404 } else if (reserved_name(pat)) {
405 tcpd_warn("%s: user name may be reserved word", pat);
410 static int is_inet6_addr(pat)
413 struct addrinfo hints, *res;
420 if ((ch = pat[len - 1]) != ']')
423 memset(&hints, 0, sizeof(hints));
424 hints.ai_family = AF_INET6;
425 hints.ai_socktype = SOCK_STREAM;
426 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
427 if ((ret = getaddrinfo(pat + 1, NULL, &hints, &res)) == 0)
434 /* check_host - criticize host pattern */
436 static int check_host(pat)
443 struct tcpd_context saved_context;
445 char *wsp = " \t\r\n";
447 if (pat[0] == '@') { /* @netgroup */
449 /* SCO has no *netgrent() support */
456 setnetgrent(pat + 1);
457 if (getnetgrent(&machinep, &userp, &domainp) == 0)
458 tcpd_warn("%s: unknown or empty netgroup", pat + 1);
461 tcpd_warn("netgroup support disabled");
464 } else if (pat[0] == '/') { /* /path/name */
465 if ((fp = fopen(pat, "r")) != 0) {
466 saved_context = tcpd_context;
467 tcpd_context.file = pat;
468 tcpd_context.line = 0;
469 while (fgets(buf, sizeof(buf), fp)) {
471 for (cp = strtok(buf, wsp); cp; cp = strtok((char *) 0, wsp))
474 tcpd_context = saved_context;
476 } else if (errno != ENOENT) {
477 tcpd_warn("open %s: %m", pat);
479 } else if (mask = split_at(pat, '/')) { /* network/netmask */
483 if ((dot_quad_addr(pat) == INADDR_NONE
484 || dot_quad_addr(mask) == INADDR_NONE)
485 && (!is_inet6_addr(pat)
486 || ((mask_len = atoi(mask)) < 0 || mask_len > 128)))
488 if (dot_quad_addr(pat) == INADDR_NONE
489 || dot_quad_addr(mask) == INADDR_NONE)
491 tcpd_warn("%s/%s: bad net/mask pattern", pat, mask);
492 } else if (STR_EQ(pat, "FAIL")) { /* obsolete */
493 tcpd_warn("FAIL is no longer recognized");
494 tcpd_warn("(use EXCEPT or DENY instead)");
495 } else if (reserved_name(pat)) { /* other reserved */
498 } else if (is_inet6_addr(pat)) { /* IPv6 address */
501 } else if (NOT_INADDR(pat)) { /* internet name */
502 if (pat[strlen(pat) - 1] == '.') {
503 tcpd_warn("%s: domain or host name ends in dot", pat);
504 } else if (pat[0] != '.') {
505 addr_count = check_dns(pat);
507 } else { /* numeric form */
508 if (STR_EQ(pat, "0.0.0.0") || STR_EQ(pat, "255.255.255.255")) {
510 } else if (pat[0] == '.') {
511 tcpd_warn("%s: network number begins with dot", pat);
512 } else if (pat[strlen(pat) - 1] != '.') {
519 /* reserved_name - determine if name is reserved */
521 static int reserved_name(pat)
524 return (STR_EQ(pat, unknown)
525 || STR_EQ(pat, "KNOWN")
526 || STR_EQ(pat, paranoid)
527 || STR_EQ(pat, "ALL")
528 || STR_EQ(pat, "LOCAL"));