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 $
19 /* System libraries. */
21 #include <sys/types.h>
24 #include <sys/socket.h>
26 #include <netinet/in.h>
27 #include <arpa/inet.h>
42 #define INADDR_NONE (-1) /* XXX should be 0xffffffff */
46 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
49 /* Application-specific. */
56 * Stolen from hosts_access.c...
58 static char sep[] = ", \t\n";
63 int hosts_access_verbose = 0;
64 char *hosts_allow_table = HOSTS_ALLOW;
65 char *hosts_deny_table = HOSTS_DENY;
66 extern jmp_buf tcpd_buf;
72 static void parse_table();
73 static void print_list();
74 static void check_daemon_list();
75 static void check_client_list();
76 static void check_daemon();
77 static void check_user();
78 static int check_host();
79 static int reserved_name();
87 static int defl_verdict;
89 static int allow_check;
96 struct request_info request;
105 while ((c = getopt(argc, argv, "adi:v")) != EOF) {
111 hosts_allow_table = "hosts.allow";
112 hosts_deny_table = "hosts.deny";
118 hosts_access_verbose++;
129 * When confusion really strikes...
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);
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.
142 inetcf = inet_cfg(inetcf);
143 if (hosts_access_verbose)
144 printf("Using network configuration file: %s\n", inetcf);
147 * These are not run from inetd but may have built-in access control.
149 inet_set("portmap", WR_NOT);
150 inet_set("rpcbind", WR_NOT);
153 * Check accessibility of access control files.
155 (void) check_path(hosts_allow_table, &st);
156 (void) check_path(hosts_deny_table, &st);
159 * Fake up an arbitrary service request.
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",
172 * Examine all access-control rules.
174 defl_verdict = PERMIT;
175 parse_table(hosts_allow_table, &request);
177 parse_table(hosts_deny_table, &request);
181 /* usage - explain */
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");
193 /* parse_table - like table_match(), but examines _all_ entries */
195 static void parse_table(table, request)
197 struct request_info *request;
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 */
204 #ifdef PROCESS_OPTIONS
205 int real_verdict, verdict;
207 struct tcpd_context saved_context;
209 saved_context = tcpd_context; /* stupid compilers */
211 if ((fp = fopen(table, "r")) != NULL) {
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");
219 if (sv_list[0] == '#' || sv_list[strspn(sv_list, " \t\r\n")] == 0)
221 if ((cl_list = split_at(sv_list, ':')) == 0) {
222 tcpd_warn("missing \":\" separator");
225 sh_cmd = split_at(cl_list, ':');
227 if (hosts_access_verbose)
228 printf("\n>>> Rule %s line %d:\n",
229 tcpd_context.file, tcpd_context.line);
231 if (hosts_access_verbose)
232 print_list("daemons: ", sv_list);
233 check_daemon_list(sv_list);
235 if (hosts_access_verbose)
236 print_list("clients: ", cl_list);
237 check_client_list(cl_list);
239 #ifdef PROCESS_OPTIONS
240 real_verdict = defl_verdict;
242 verdict = setjmp(tcpd_buf);
244 real_verdict = (verdict == AC_PERMIT);
247 process_options(sh_cmd, request);
248 if (dry_run == 1 && real_verdict && allow_check)
249 tcpd_warn("implicit \"allow\" at end of rule");
251 } else if (defl_verdict && allow_check) {
252 tcpd_warn("implicit \"allow\" at end of rule");
254 if (hosts_access_verbose)
255 printf("access: %s\n", real_verdict ? "granted" : "denied");
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");
264 } else if (errno != ENOENT) {
265 tcpd_warn("cannot open %s: %m", table);
267 tcpd_context = saved_context;
270 /* print_list - pretty-print a list */
272 static void print_list(title, list)
280 fputs(title, stdout);
283 for (cp = strtok(buf, sep); cp != 0; cp = next) {
285 next = strtok((char *) 0, sep);
292 /* check_daemon_list - criticize daemon list */
294 static void check_daemon_list(list)
304 for (cp = strtok(buf, sep); cp != 0; cp = strtok((char *) 0, sep)) {
305 if (STR_EQ(cp, "EXCEPT")) {
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)");
317 tcpd_warn("daemon list is empty or ends in EXCEPT");
320 /* check_client_list - criticize client list */
322 static void check_client_list(list)
332 for (cp = strtok(buf, sep); cp != 0; cp = strtok((char *) 0, sep)) {
333 if (STR_EQ(cp, "EXCEPT")) {
337 if ((host = split_at(cp + 1, '@')) != NULL) { /* user@host */
346 tcpd_warn("client list is empty or ends in EXCEPT");
349 /* check_daemon - criticize daemon pattern */
351 static void check_daemon(pat)
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)) {
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);
370 switch (inet_get(pat)) {
372 tcpd_warn("%s: no such process name in %s", pat, inetcf);
373 inet_set(pat, WR_YES); /* shut up next time */
376 tcpd_warn("%s: service possibly not wrapped", pat);
377 inet_set(pat, WR_YES);
383 /* check_user - criticize user pattern */
385 static void check_user(pat)
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")) {
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);
408 static int is_inet6_addr(pat)
411 struct addrinfo hints, *res;
418 if ((ch = pat[len - 1]) != ']')
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)
432 /* check_host - criticize host pattern */
434 static int check_host(pat)
441 struct tcpd_context saved_context;
443 char *wsp = " \t\r\n";
445 if (pat[0] == '@') { /* @netgroup */
447 /* SCO has no *netgrent() support */
454 setnetgrent(pat + 1);
455 if (getnetgrent(&machinep, &userp, &domainp) == 0)
456 tcpd_warn("%s: unknown or empty netgroup", pat + 1);
459 tcpd_warn("netgroup support disabled");
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)) {
469 for (cp = strtok(buf, wsp); cp; cp = strtok((char *) 0, wsp))
472 tcpd_context = saved_context;
474 } else if (errno != ENOENT) {
475 tcpd_warn("open %s: %m", pat);
477 } else if ((mask = split_at(pat, '/')) != NULL) { /* network/netmask */
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)))
486 if (dot_quad_addr(pat) == INADDR_NONE
487 || dot_quad_addr(mask) == INADDR_NONE)
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 */
496 } else if (is_inet6_addr(pat)) { /* IPv6 address */
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);
505 } else { /* numeric form */
506 if (STR_EQ(pat, "0.0.0.0") || STR_EQ(pat, "255.255.255.255")) {
508 } else if (pat[0] == '.') {
509 tcpd_warn("%s: network number begins with dot", pat);
510 } else if (pat[strlen(pat) - 1] != '.') {
517 /* reserved_name - determine if name is reserved */
519 static int reserved_name(pat)
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"));