3 * Routines to parse an inetd.conf or tlid.conf file. This would be a great
4 * job for a PERL script.
6 * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
10 static char sccsid[] = "@(#) inetcf.c 1.7 97/02/12 02:13:23";
13 #include <sys/types.h>
25 * Network configuration files may live in unusual places. Here are some
26 * guesses. Shorter names follow longer ones.
28 char *inet_files[] = {
29 "/private/etc/inetd.conf", /* NEXT */
30 "/etc/inet/inetd.conf", /* SYSV4 */
31 "/usr/etc/inetd.conf", /* IRIX?? */
32 "/etc/inetd.conf", /* BSD */
33 "/etc/net/tlid.conf", /* SYSV4?? */
34 "/etc/saf/tlid.conf", /* SYSV4?? */
35 "/etc/tlid.conf", /* SYSV4?? */
39 static void inet_chk(char *protocol, char *path, char *arg0, char *arg1);
40 static char *base_name(char *path);
41 extern char *percent_m(char *obuf, char *ibuf);
44 * Structure with everything we know about a service.
47 struct inet_ent *next;
52 static struct inet_ent *inet_list = 0;
54 static char whitespace[] = " \t\r\n";
56 /* inet_conf - read in and examine inetd.conf (or tlid.conf) entries */
69 struct tcpd_context saved_context;
73 saved_context = tcpd_context;
76 * The inetd.conf (or tlid.conf) information is so useful that we insist
77 * on its availability. When no file is given run a series of educated
81 if ((fp = fopen(conf, "r")) == 0) {
82 fprintf(stderr, percent_m(buf, "open %s: %m\n"), conf);
86 for (i = 0; inet_files[i] && (fp = fopen(inet_files[i], "r")) == 0; i++)
89 fprintf(stderr, "Cannot find your inetd.conf or tlid.conf file.\n");
90 fprintf(stderr, "Please specify its location.\n");
94 check_path(conf, &st);
98 * Process the file. After the 7.0 wrapper release it became clear that
99 * there are many more inetd.conf formats than the 8 systems that I had
100 * studied. EP/IX uses a two-line specification for rpc services; HP-UX
101 * permits long lines to be broken with backslash-newline.
103 tcpd_context.file = conf;
104 tcpd_context.line = 0;
105 while (xgets(buf, sizeof(buf), fp)) {
106 service = strtok(buf, whitespace); /* service */
107 if (service == 0 || *service == '#')
109 if (STR_NE(service, "stream") && STR_NE(service, "dgram"))
110 strtok((char *) 0, whitespace); /* endpoint */
111 protocol = strtok((char *) 0, whitespace);
112 (void) strtok((char *) 0, whitespace); /* wait */
113 if ((user = strtok((char *) 0, whitespace)) == 0)
115 if (user[0] == '/') { /* user */
118 if ((path = strtok((char *) 0, whitespace)) == 0)
121 if (path[0] == '?') /* IRIX optional service */
123 if (STR_EQ(path, "internal"))
125 if (path[strspn(path, "-0123456789")] == 0) {
128 * ConvexOS puts RPC version numbers before path names. Jukka
129 * Ukkonen <ukkonen@csc.fi>.
131 if ((path = strtok((char *) 0, whitespace)) == 0)
134 if ((arg0 = strtok((char *) 0, whitespace)) == 0) {
135 tcpd_warn("incomplete line");
138 if (arg0[strspn(arg0, "0123456789")] == 0) {
141 * We're reading a tlid.conf file, the format is:
143 * ...stuff... path arg_count arguments mod_count modules
145 if ((arg0 = strtok((char *) 0, whitespace)) == 0) {
146 tcpd_warn("incomplete line");
150 if ((arg1 = strtok((char *) 0, whitespace)) == 0)
153 inet_chk(protocol, path, arg0, arg1);
156 tcpd_context = saved_context;
160 /* inet_chk - examine one inetd.conf (tlid.conf?) entry */
162 static void inet_chk(protocol, path, arg0, arg1)
170 int wrap_status = WR_MAYBE;
171 char *base_name_path = base_name(path);
172 char *tcpd_proc_name = (arg0[0] == '/' ? base_name(arg0) : arg0);
175 * Always warn when the executable does not exist or when it is not
178 if (check_path(path, &st) < 0) {
179 tcpd_warn("%s: not found: %m", path);
180 } else if ((st.st_mode & 0100) == 0) {
181 tcpd_warn("%s: not executable", path);
185 * Cheat on the miscd tests, nobody uses it anymore.
187 if (STR_EQ(base_name_path, "miscd")) {
188 inet_set(arg0, WR_YES);
193 * While we are here...
195 if (STR_EQ(tcpd_proc_name, "rexd") || STR_EQ(tcpd_proc_name, "rpc.rexd"))
196 tcpd_warn("%s may be an insecure service", tcpd_proc_name);
199 * The tcpd program gets most of the attention.
201 if (STR_EQ(base_name_path, "tcpd")) {
203 if (STR_EQ(tcpd_proc_name, "tcpd"))
204 tcpd_warn("%s is recursively calling itself", tcpd_proc_name);
206 wrap_status = WR_YES;
209 * Check: some sites install the wrapper set-uid.
211 if ((st.st_mode & 06000) != 0)
212 tcpd_warn("%s: file is set-uid or set-gid", path);
215 * Check: some sites insert tcpd in inetd.conf, instead of replacing
216 * the daemon pathname.
218 if (arg0[0] == '/' && STR_EQ(tcpd_proc_name, base_name(arg1)))
219 tcpd_warn("%s inserted before %s", path, arg0);
222 * Check: make sure files exist and are executable. On some systems
223 * the network daemons are set-uid so we cannot complain. Note that
224 * tcpd takes the basename only in case of absolute pathnames.
226 if (arg0[0] == '/') { /* absolute path */
227 if (check_path(arg0, &st) < 0) {
228 tcpd_warn("%s: not found: %m", arg0);
229 } else if ((st.st_mode & 0100) == 0) {
230 tcpd_warn("%s: not executable", arg0);
232 } else { /* look in REAL_DAEMON_DIR */
233 sprintf(daemon, "%s/%s", REAL_DAEMON_DIR, arg0);
234 if (check_path(daemon, &st) < 0) {
235 tcpd_warn("%s: not found in %s: %m",
236 arg0, REAL_DAEMON_DIR);
237 } else if ((st.st_mode & 0100) == 0) {
238 tcpd_warn("%s: not executable", daemon);
245 * No tcpd program found. Perhaps they used the "simple installation"
246 * recipe. Look for a file with the same basename in REAL_DAEMON_DIR.
247 * Draw some conservative conclusions when a distinct file is found.
249 sprintf(daemon, "%s/%s", REAL_DAEMON_DIR, arg0);
250 if (STR_EQ(path, daemon)) {
252 wrap_status = WR_MAYBE;
254 wrap_status = WR_NOT;
256 } else if (check_path(daemon, &st) >= 0) {
257 wrap_status = WR_MAYBE;
258 } else if (errno == ENOENT) {
259 wrap_status = WR_NOT;
261 tcpd_warn("%s: file lookup: %m", daemon);
262 wrap_status = WR_MAYBE;
267 * Alas, we cannot wrap rpc/tcp services.
269 if (wrap_status == WR_YES && STR_EQ(protocol, "rpc/tcp"))
270 tcpd_warn("%s: cannot wrap rpc/tcp services", tcpd_proc_name);
272 inet_set(tcpd_proc_name, wrap_status);
275 /* inet_set - remember service status */
277 void inet_set(name, type)
281 struct inet_ent *ip =
282 (struct inet_ent *) malloc(sizeof(struct inet_ent) + strlen(name));
285 fprintf(stderr, "out of memory\n");
288 ip->next = inet_list;
289 strcpy(ip->name, name);
294 /* inet_get - look up service status */
304 for (ip = inet_list; ip; ip = ip->next)
305 if (STR_EQ(ip->name, name))
311 /* base_name - compute last pathname component */
313 static char *base_name(path)
318 if ((cp = strrchr(path, '/')) != 0)