1999-03-14 17:13:19 +00:00
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|
|
/*
|
|
|
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* tcpdmatch - explain what tcpd would do in a specific case
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|
*
|
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* usage: tcpdmatch [-d] [-i inet_conf] daemon[@host] [user@]host
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*
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* -d: use the access control tables in the current directory.
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*
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* -i: location of inetd.conf file.
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*
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|
|
* All errors are reported to the standard error stream, including the errors
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|
|
* that would normally be reported via the syslog daemon.
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*
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* Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
|
2000-02-03 10:27:03 +00:00
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*
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|
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* $FreeBSD$
|
1999-03-14 17:13:19 +00:00
|
|
|
*/
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|
#ifndef lint
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|
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static char sccsid[] = "@(#) tcpdmatch.c 1.5 96/02/11 17:01:36";
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|
|
#endif
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|
/* System libraries. */
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|
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|
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#include <sys/types.h>
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|
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#include <sys/stat.h>
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|
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#include <sys/socket.h>
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|
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#include <netinet/in.h>
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|
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <stdio.h>
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|
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#include <syslog.h>
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|
|
#include <setjmp.h>
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|
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#include <string.h>
|
2017-06-16 22:32:23 +00:00
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#include <unistd.h>
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1999-03-14 17:13:19 +00:00
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|
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extern void exit();
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|
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extern int optind;
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extern char *optarg;
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#ifndef INADDR_NONE
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|
#define INADDR_NONE (-1) /* XXX should be 0xffffffff */
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|
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#endif
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|
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#ifndef S_ISDIR
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|
|
#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
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|
#endif
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|
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/* Application-specific. */
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#include "tcpd.h"
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|
|
#include "inetcf.h"
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|
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#include "scaffold.h"
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|
2019-07-17 23:09:40 +00:00
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|
|
static void usage(char *myname);
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|
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static void tcpdmatch(struct request_info *request);
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1999-03-14 17:13:19 +00:00
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/* The main program */
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int main(argc, argv)
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int argc;
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char **argv;
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|
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{
|
2000-07-14 17:15:34 +00:00
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|
#ifdef INET6
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|
|
struct addrinfo hints, *hp, *res;
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#else
|
1999-03-14 17:13:19 +00:00
|
|
|
struct hostent *hp;
|
2000-07-14 17:15:34 +00:00
|
|
|
#endif
|
1999-03-14 17:13:19 +00:00
|
|
|
char *myname = argv[0];
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|
|
char *client;
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|
|
char *server;
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|
|
char *addr;
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|
|
char *user;
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|
|
char *daemon;
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|
|
struct request_info request;
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|
|
int ch;
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|
|
char *inetcf = 0;
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|
|
int count;
|
2000-02-03 10:27:03 +00:00
|
|
|
#ifdef INET6
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|
|
struct sockaddr_storage server_sin;
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|
|
struct sockaddr_storage client_sin;
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|
|
#else
|
1999-03-14 17:13:19 +00:00
|
|
|
struct sockaddr_in server_sin;
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|
|
|
struct sockaddr_in client_sin;
|
2000-02-03 10:27:03 +00:00
|
|
|
#endif
|
1999-03-14 17:13:19 +00:00
|
|
|
struct stat st;
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|
|
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|
|
/*
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|
|
|
* Show what rule actually matched.
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|
|
|
*/
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|
|
|
hosts_access_verbose = 2;
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|
|
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|
|
/*
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|
|
|
* Parse the JCL.
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|
|
|
*/
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|
|
while ((ch = getopt(argc, argv, "di:")) != EOF) {
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|
|
|
switch (ch) {
|
|
|
|
case 'd':
|
|
|
|
hosts_allow_table = "hosts.allow";
|
|
|
|
hosts_deny_table = "hosts.deny";
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|
|
|
break;
|
|
|
|
case 'i':
|
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|
|
inetcf = optarg;
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|
|
|
break;
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|
|
|
default:
|
|
|
|
usage(myname);
|
|
|
|
/* NOTREACHED */
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (argc != optind + 2)
|
|
|
|
usage(myname);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* When confusion really strikes...
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|
|
|
*/
|
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|
|
if (check_path(REAL_DAEMON_DIR, &st) < 0) {
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|
|
|
tcpd_warn("REAL_DAEMON_DIR %s: %m", REAL_DAEMON_DIR);
|
|
|
|
} else if (!S_ISDIR(st.st_mode)) {
|
|
|
|
tcpd_warn("REAL_DAEMON_DIR %s is not a directory", REAL_DAEMON_DIR);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Default is to specify a daemon process name. When daemon@host is
|
|
|
|
* specified, separate the two parts.
|
|
|
|
*/
|
|
|
|
if ((server = split_at(argv[optind], '@')) == 0)
|
|
|
|
server = unknown;
|
|
|
|
if (argv[optind][0] == '/') {
|
|
|
|
daemon = strrchr(argv[optind], '/') + 1;
|
|
|
|
tcpd_warn("%s: daemon name normalized to: %s", argv[optind], daemon);
|
|
|
|
} else {
|
|
|
|
daemon = argv[optind];
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Default is to specify a client hostname or address. When user@host is
|
|
|
|
* specified, separate the two parts.
|
|
|
|
*/
|
|
|
|
if ((client = split_at(argv[optind + 1], '@')) != 0) {
|
|
|
|
user = argv[optind + 1];
|
|
|
|
} else {
|
|
|
|
client = argv[optind + 1];
|
|
|
|
user = unknown;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Analyze the inetd (or tlid) configuration file, so that we can warn
|
|
|
|
* the user about services that may not be wrapped, services that are not
|
|
|
|
* configured, or services that are wrapped in an incorrect manner. Allow
|
|
|
|
* for services that are not run from inetd, or that have tcpd access
|
|
|
|
* control built into them.
|
|
|
|
*/
|
|
|
|
inetcf = inet_cfg(inetcf);
|
|
|
|
inet_set("portmap", WR_NOT);
|
|
|
|
inet_set("rpcbind", WR_NOT);
|
|
|
|
switch (inet_get(daemon)) {
|
|
|
|
case WR_UNKNOWN:
|
|
|
|
tcpd_warn("%s: no such process name in %s", daemon, inetcf);
|
|
|
|
break;
|
|
|
|
case WR_NOT:
|
|
|
|
tcpd_warn("%s: service possibly not wrapped", daemon);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check accessibility of access control files.
|
|
|
|
*/
|
|
|
|
(void) check_path(hosts_allow_table, &st);
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|
|
(void) check_path(hosts_deny_table, &st);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Fill in what we have figured out sofar. Use socket and DNS routines
|
|
|
|
* for address and name conversions. We attach stdout to the request so
|
|
|
|
* that banner messages will become visible.
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|
|
|
*/
|
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|
|
request_init(&request, RQ_DAEMON, daemon, RQ_USER, user, RQ_FILE, 1, 0);
|
|
|
|
sock_methods(&request);
|
|
|
|
|
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|
|
/*
|
|
|
|
* If a server hostname is specified, insist that the name maps to at
|
|
|
|
* most one address. eval_hostname() warns the user about name server
|
|
|
|
* problems, while using the request.server structure as a cache for host
|
|
|
|
* address and name conversion results.
|
|
|
|
*/
|
|
|
|
if (NOT_INADDR(server) == 0 || HOSTNAME_KNOWN(server)) {
|
|
|
|
if ((hp = find_inet_addr(server)) == 0)
|
|
|
|
exit(1);
|
2000-07-14 17:15:34 +00:00
|
|
|
#ifndef INET6
|
1999-03-14 17:13:19 +00:00
|
|
|
memset((char *) &server_sin, 0, sizeof(server_sin));
|
|
|
|
server_sin.sin_family = AF_INET;
|
2000-02-03 10:27:03 +00:00
|
|
|
#endif
|
1999-03-14 17:13:19 +00:00
|
|
|
request_set(&request, RQ_SERVER_SIN, &server_sin, 0);
|
|
|
|
|
2000-02-03 10:27:03 +00:00
|
|
|
#ifdef INET6
|
2000-07-14 17:15:34 +00:00
|
|
|
for (res = hp, count = 0; res; res = res->ai_next, count++) {
|
|
|
|
memcpy(&server_sin, res->ai_addr, res->ai_addrlen);
|
2000-02-03 10:27:03 +00:00
|
|
|
#else
|
2000-07-14 17:15:34 +00:00
|
|
|
for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
|
1999-03-14 17:13:19 +00:00
|
|
|
memcpy((char *) &server_sin.sin_addr, addr,
|
|
|
|
sizeof(server_sin.sin_addr));
|
2000-02-03 10:27:03 +00:00
|
|
|
#endif
|
1999-03-14 17:13:19 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Force evaluation of server host name and address. Host name
|
|
|
|
* conflicts will be reported while eval_hostname() does its job.
|
|
|
|
*/
|
|
|
|
request_set(&request, RQ_SERVER_NAME, "", RQ_SERVER_ADDR, "", 0);
|
|
|
|
if (STR_EQ(eval_hostname(request.server), unknown))
|
|
|
|
tcpd_warn("host address %s->name lookup failed",
|
|
|
|
eval_hostaddr(request.server));
|
|
|
|
}
|
|
|
|
if (count > 1) {
|
|
|
|
fprintf(stderr, "Error: %s has more than one address\n", server);
|
|
|
|
fprintf(stderr, "Please specify an address instead\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
2000-07-14 17:15:34 +00:00
|
|
|
#ifdef INET6
|
|
|
|
freeaddrinfo(hp);
|
|
|
|
#else
|
1999-03-14 17:13:19 +00:00
|
|
|
free((char *) hp);
|
2000-07-14 17:15:34 +00:00
|
|
|
#endif
|
1999-03-14 17:13:19 +00:00
|
|
|
} else {
|
|
|
|
request_set(&request, RQ_SERVER_NAME, server, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If a client address is specified, we simulate the effect of client
|
|
|
|
* hostname lookup failure.
|
|
|
|
*/
|
|
|
|
if (dot_quad_addr(client) != INADDR_NONE) {
|
|
|
|
request_set(&request, RQ_CLIENT_ADDR, client, 0);
|
|
|
|
tcpdmatch(&request);
|
|
|
|
exit(0);
|
|
|
|
}
|
2000-07-14 17:15:34 +00:00
|
|
|
#ifdef INET6
|
|
|
|
memset(&hints, 0, sizeof(hints));
|
|
|
|
hints.ai_family = AF_INET6;
|
|
|
|
hints.ai_socktype = SOCK_STREAM;
|
|
|
|
hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
|
|
|
|
if (getaddrinfo(client, NULL, &hints, &res) == 0) {
|
|
|
|
freeaddrinfo(res);
|
|
|
|
request_set(&request, RQ_CLIENT_ADDR, client, 0);
|
|
|
|
tcpdmatch(&request);
|
|
|
|
exit(0);
|
|
|
|
}
|
|
|
|
#endif
|
1999-03-14 17:13:19 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Perhaps they are testing special client hostname patterns that aren't
|
|
|
|
* really host names at all.
|
|
|
|
*/
|
|
|
|
if (NOT_INADDR(client) && HOSTNAME_KNOWN(client) == 0) {
|
|
|
|
request_set(&request, RQ_CLIENT_NAME, client, 0);
|
|
|
|
tcpdmatch(&request);
|
|
|
|
exit(0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Otherwise, assume that a client hostname is specified, and insist that
|
|
|
|
* the address can be looked up. The reason for this requirement is that
|
|
|
|
* in real life the client address is available (at least with IP). Let
|
|
|
|
* eval_hostname() figure out if this host is properly registered, while
|
|
|
|
* using the request.client structure as a cache for host name and
|
|
|
|
* address conversion results.
|
|
|
|
*/
|
|
|
|
if ((hp = find_inet_addr(client)) == 0)
|
|
|
|
exit(1);
|
2000-02-03 10:27:03 +00:00
|
|
|
#ifdef INET6
|
2000-07-14 17:15:34 +00:00
|
|
|
request_set(&request, RQ_CLIENT_SIN, &client_sin, 0);
|
|
|
|
|
|
|
|
for (res = hp, count = 0; res; res = res->ai_next, count++) {
|
|
|
|
memcpy(&client_sin, res->ai_addr, res->ai_addrlen);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* getnameinfo() doesn't do reverse lookup against link-local
|
|
|
|
* address. So, we pass through host name evaluation against
|
|
|
|
* such addresses.
|
|
|
|
*/
|
|
|
|
if (res->ai_family != AF_INET6 ||
|
|
|
|
!IN6_IS_ADDR_LINKLOCAL(&((struct sockaddr_in6 *)res->ai_addr)->sin6_addr)) {
|
|
|
|
/*
|
|
|
|
* Force evaluation of client host name and address. Host name
|
|
|
|
* conflicts will be reported while eval_hostname() does its job.
|
|
|
|
*/
|
|
|
|
request_set(&request, RQ_CLIENT_NAME, "", RQ_CLIENT_ADDR, "", 0);
|
|
|
|
if (STR_EQ(eval_hostname(request.client), unknown))
|
|
|
|
tcpd_warn("host address %s->name lookup failed",
|
|
|
|
eval_hostaddr(request.client));
|
|
|
|
}
|
|
|
|
tcpdmatch(&request);
|
|
|
|
if (res->ai_next)
|
|
|
|
printf("\n");
|
2000-02-03 10:27:03 +00:00
|
|
|
}
|
2000-07-14 17:15:34 +00:00
|
|
|
freeaddrinfo(hp);
|
2000-02-03 10:27:03 +00:00
|
|
|
#else
|
2000-07-14 17:15:34 +00:00
|
|
|
memset((char *) &client_sin, 0, sizeof(client_sin));
|
1999-03-14 17:13:19 +00:00
|
|
|
client_sin.sin_family = AF_INET;
|
|
|
|
request_set(&request, RQ_CLIENT_SIN, &client_sin, 0);
|
|
|
|
|
|
|
|
for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
|
|
|
|
memcpy((char *) &client_sin.sin_addr, addr,
|
|
|
|
sizeof(client_sin.sin_addr));
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Force evaluation of client host name and address. Host name
|
|
|
|
* conflicts will be reported while eval_hostname() does its job.
|
|
|
|
*/
|
|
|
|
request_set(&request, RQ_CLIENT_NAME, "", RQ_CLIENT_ADDR, "", 0);
|
|
|
|
if (STR_EQ(eval_hostname(request.client), unknown))
|
|
|
|
tcpd_warn("host address %s->name lookup failed",
|
|
|
|
eval_hostaddr(request.client));
|
|
|
|
tcpdmatch(&request);
|
|
|
|
if (hp->h_addr_list[count + 1])
|
|
|
|
printf("\n");
|
|
|
|
}
|
|
|
|
free((char *) hp);
|
2000-07-14 17:15:34 +00:00
|
|
|
#endif
|
1999-03-14 17:13:19 +00:00
|
|
|
exit(0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Explain how to use this program */
|
|
|
|
|
|
|
|
static void usage(myname)
|
|
|
|
char *myname;
|
|
|
|
{
|
|
|
|
fprintf(stderr, "usage: %s [-d] [-i inet_conf] daemon[@host] [user@]host\n",
|
|
|
|
myname);
|
|
|
|
fprintf(stderr, " -d: use allow/deny files in current directory\n");
|
|
|
|
fprintf(stderr, " -i: location of inetd.conf file\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Print interesting expansions */
|
|
|
|
|
|
|
|
static void expand(text, pattern, request)
|
|
|
|
char *text;
|
|
|
|
char *pattern;
|
|
|
|
struct request_info *request;
|
|
|
|
{
|
|
|
|
char buf[BUFSIZ];
|
|
|
|
|
|
|
|
if (STR_NE(percent_x(buf, sizeof(buf), pattern, request), unknown))
|
|
|
|
printf("%s %s\n", text, buf);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Try out a (server,client) pair */
|
|
|
|
|
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static void tcpdmatch(request)
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struct request_info *request;
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{
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int verdict;
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/*
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* Show what we really know. Suppress uninteresting noise.
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*/
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expand("client: hostname", "%n", request);
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expand("client: address ", "%a", request);
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expand("client: username", "%u", request);
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expand("server: hostname", "%N", request);
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expand("server: address ", "%A", request);
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expand("server: process ", "%d", request);
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/*
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* Reset stuff that might be changed by options handlers. In dry-run
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* mode, extension language routines that would not return should inform
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* us of their plan, by clearing the dry_run flag. This is a bit clumsy
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* but we must be able to verify hosts with more than one network
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* address.
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*/
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rfc931_timeout = RFC931_TIMEOUT;
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allow_severity = SEVERITY;
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deny_severity = LOG_WARNING;
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dry_run = 1;
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/*
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* When paranoid mode is enabled, access is rejected no matter what the
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* access control rules say.
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*/
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#ifdef PARANOID
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if (STR_EQ(eval_hostname(request->client), paranoid)) {
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printf("access: denied (PARANOID mode)\n\n");
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return;
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}
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#endif
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/*
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* Report the access control verdict.
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*/
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verdict = hosts_access(request);
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printf("access: %s\n",
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dry_run == 0 ? "delegated" :
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verdict ? "granted" : "denied");
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}
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