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-rw-r--r--inetcf.c317
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+ /*
+ * Routines to parse an inetd.conf or tlid.conf file. This would be a great
+ * job for a PERL script.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) inetcf.c 1.7 97/02/12 02:13:23";
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+extern int errno;
+extern void exit();
+
+#include "tcpd.h"
+#include "inetcf.h"
+
+ /*
+ * Network configuration files may live in unusual places. Here are some
+ * guesses. Shorter names follow longer ones.
+ */
+char *inet_files[] = {
+ "/private/etc/inetd.conf", /* NEXT */
+ "/etc/inet/inetd.conf", /* SYSV4 */
+ "/usr/etc/inetd.conf", /* IRIX?? */
+ "/etc/inetd.conf", /* BSD */
+ "/etc/net/tlid.conf", /* SYSV4?? */
+ "/etc/saf/tlid.conf", /* SYSV4?? */
+ "/etc/tlid.conf", /* SYSV4?? */
+ 0,
+};
+
+static void inet_chk();
+static char *base_name();
+
+ /*
+ * Structure with everything we know about a service.
+ */
+struct inet_ent {
+ struct inet_ent *next;
+ int type;
+ char name[1];
+};
+
+static struct inet_ent *inet_list = 0;
+
+static char whitespace[] = " \t\r\n";
+
+/* inet_conf - read in and examine inetd.conf (or tlid.conf) entries */
+
+char *inet_cfg(conf)
+char *conf;
+{
+ char buf[BUFSIZ];
+ FILE *fp;
+ char *service;
+ char *protocol;
+ char *user;
+ char *path;
+ char *arg0;
+ char *arg1;
+ struct tcpd_context saved_context;
+ char *percent_m();
+ int i;
+ struct stat st;
+
+ saved_context = tcpd_context;
+
+ /*
+ * The inetd.conf (or tlid.conf) information is so useful that we insist
+ * on its availability. When no file is given run a series of educated
+ * guesses.
+ */
+ if (conf != 0) {
+ if ((fp = fopen(conf, "r")) == 0) {
+ fprintf(stderr, percent_m(buf, "open %s: %m\n"), conf);
+ exit(1);
+ }
+ } else {
+ for (i = 0; inet_files[i] && (fp = fopen(inet_files[i], "r")) == 0; i++)
+ /* void */ ;
+ if (fp == 0) {
+ fprintf(stderr, "Cannot find your inetd.conf or tlid.conf file.\n");
+ fprintf(stderr, "Please specify its location.\n");
+ exit(1);
+ }
+ conf = inet_files[i];
+ check_path(conf, &st);
+ }
+
+ /*
+ * Process the file. After the 7.0 wrapper release it became clear that
+ * there are many more inetd.conf formats than the 8 systems that I had
+ * studied. EP/IX uses a two-line specification for rpc services; HP-UX
+ * permits long lines to be broken with backslash-newline.
+ */
+ tcpd_context.file = conf;
+ tcpd_context.line = 0;
+ while (xgets(buf, sizeof(buf), fp)) {
+ service = strtok(buf, whitespace); /* service */
+ if (service == 0 || *service == '#')
+ continue;
+ if (STR_NE(service, "stream") && STR_NE(service, "dgram"))
+ strtok((char *) 0, whitespace); /* endpoint */
+ protocol = strtok((char *) 0, whitespace);
+ (void) strtok((char *) 0, whitespace); /* wait */
+ if ((user = strtok((char *) 0, whitespace)) == 0)
+ continue;
+ if (user[0] == '/') { /* user */
+ path = user;
+ } else { /* path */
+ if ((path = strtok((char *) 0, whitespace)) == 0)
+ continue;
+ }
+ if (path[0] == '?') /* IRIX optional service */
+ path++;
+ if (STR_EQ(path, "internal"))
+ continue;
+ if (path[strspn(path, "-0123456789")] == 0) {
+
+ /*
+ * ConvexOS puts RPC version numbers before path names. Jukka
+ * Ukkonen <ukkonen@csc.fi>.
+ */
+ if ((path = strtok((char *) 0, whitespace)) == 0)
+ continue;
+ }
+ if ((arg0 = strtok((char *) 0, whitespace)) == 0) {
+ tcpd_warn("incomplete line");
+ continue;
+ }
+ if (arg0[strspn(arg0, "0123456789")] == 0) {
+
+ /*
+ * We're reading a tlid.conf file, the format is:
+ *
+ * ...stuff... path arg_count arguments mod_count modules
+ */
+ if ((arg0 = strtok((char *) 0, whitespace)) == 0) {
+ tcpd_warn("incomplete line");
+ continue;
+ }
+ }
+ if ((arg1 = strtok((char *) 0, whitespace)) == 0)
+ arg1 = "";
+
+ inet_chk(protocol, path, arg0, arg1);
+ }
+ fclose(fp);
+ tcpd_context = saved_context;
+ return (conf);
+}
+
+/* inet_chk - examine one inetd.conf (tlid.conf?) entry */
+
+static void inet_chk(protocol, path, arg0, arg1)
+char *protocol;
+char *path;
+char *arg0;
+char *arg1;
+{
+ char daemon[BUFSIZ];
+ struct stat st;
+ int wrap_status = WR_MAYBE;
+ char *base_name_path = base_name(path);
+ char *tcpd_proc_name = (arg0[0] == '/' ? base_name(arg0) : arg0);
+
+ /*
+ * Always warn when the executable does not exist or when it is not
+ * executable.
+ */
+ if (check_path(path, &st) < 0) {
+ tcpd_warn("%s: not found: %m", path);
+ } else if ((st.st_mode & 0100) == 0) {
+ tcpd_warn("%s: not executable", path);
+ }
+
+ /*
+ * Cheat on the miscd tests, nobody uses it anymore.
+ */
+ if (STR_EQ(base_name_path, "miscd")) {
+ inet_set(arg0, WR_YES);
+ return;
+ }
+
+ /*
+ * While we are here...
+ */
+ if (STR_EQ(tcpd_proc_name, "rexd") || STR_EQ(tcpd_proc_name, "rpc.rexd"))
+ tcpd_warn("%s may be an insecure service", tcpd_proc_name);
+
+ /*
+ * The tcpd program gets most of the attention.
+ */
+ if (STR_EQ(base_name_path, "tcpd")) {
+
+ if (STR_EQ(tcpd_proc_name, "tcpd"))
+ tcpd_warn("%s is recursively calling itself", tcpd_proc_name);
+
+ wrap_status = WR_YES;
+
+ /*
+ * Check: some sites install the wrapper set-uid.
+ */
+ if ((st.st_mode & 06000) != 0)
+ tcpd_warn("%s: file is set-uid or set-gid", path);
+
+ /*
+ * Check: some sites insert tcpd in inetd.conf, instead of replacing
+ * the daemon pathname.
+ */
+ if (arg0[0] == '/' && STR_EQ(tcpd_proc_name, base_name(arg1)))
+ tcpd_warn("%s inserted before %s", path, arg0);
+
+ /*
+ * Check: make sure files exist and are executable. On some systems
+ * the network daemons are set-uid so we cannot complain. Note that
+ * tcpd takes the basename only in case of absolute pathnames.
+ */
+ if (arg0[0] == '/') { /* absolute path */
+ if (check_path(arg0, &st) < 0) {
+ tcpd_warn("%s: not found: %m", arg0);
+ } else if ((st.st_mode & 0100) == 0) {
+ tcpd_warn("%s: not executable", arg0);
+ }
+ } else { /* look in REAL_DAEMON_DIR */
+ sprintf(daemon, "%s/%s", REAL_DAEMON_DIR, arg0);
+ if (check_path(daemon, &st) < 0) {
+ tcpd_warn("%s: not found in %s: %m",
+ arg0, REAL_DAEMON_DIR);
+ } else if ((st.st_mode & 0100) == 0) {
+ tcpd_warn("%s: not executable", daemon);
+ }
+ }
+
+ } else {
+
+ /*
+ * No tcpd program found. Perhaps they used the "simple installation"
+ * recipe. Look for a file with the same basename in REAL_DAEMON_DIR.
+ * Draw some conservative conclusions when a distinct file is found.
+ */
+ sprintf(daemon, "%s/%s", REAL_DAEMON_DIR, arg0);
+ if (STR_EQ(path, daemon)) {
+ wrap_status = WR_NOT;
+ } else if (check_path(daemon, &st) >= 0) {
+ wrap_status = WR_MAYBE;
+ } else if (errno == ENOENT) {
+ wrap_status = WR_NOT;
+ } else {
+ tcpd_warn("%s: file lookup: %m", daemon);
+ wrap_status = WR_MAYBE;
+ }
+ }
+
+ /*
+ * Alas, we cannot wrap rpc/tcp services.
+ */
+ if (wrap_status == WR_YES && STR_EQ(protocol, "rpc/tcp"))
+ tcpd_warn("%s: cannot wrap rpc/tcp services", tcpd_proc_name);
+
+ inet_set(tcpd_proc_name, wrap_status);
+}
+
+/* inet_set - remember service status */
+
+void inet_set(name, type)
+char *name;
+int type;
+{
+ struct inet_ent *ip =
+ (struct inet_ent *) malloc(sizeof(struct inet_ent) + strlen(name));
+
+ if (ip == 0) {
+ fprintf(stderr, "out of memory\n");
+ exit(1);
+ }
+ ip->next = inet_list;
+ strcpy(ip->name, name);
+ ip->type = type;
+ inet_list = ip;
+}
+
+/* inet_get - look up service status */
+
+int inet_get(name)
+char *name;
+{
+ struct inet_ent *ip;
+
+ if (inet_list == 0)
+ return (WR_MAYBE);
+
+ for (ip = inet_list; ip; ip = ip->next)
+ if (STR_EQ(ip->name, name))
+ return (ip->type);
+
+ return (-1);
+}
+
+/* base_name - compute last pathname component */
+
+static char *base_name(path)
+char *path;
+{
+ char *cp;
+
+ if ((cp = strrchr(path, '/')) != 0)
+ path = cp + 1;
+ return (path);
+}
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