mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-21 11:13:30 +00:00
d8094070f9
for tcpdchk
322 lines
7.9 KiB
C
322 lines
7.9 KiB
C
/*
|
|
* 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)) {
|
|
#ifdef __FreeBSD__
|
|
wrap_status = WR_MAYBE;
|
|
#else
|
|
wrap_status = WR_NOT;
|
|
#endif
|
|
} 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);
|
|
}
|