463 lines
11 KiB
C
463 lines
11 KiB
C
/*
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* tcpdchk - examine all tcpd access control rules and inetd.conf entries
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*
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* Usage: tcpdchk [-a] [-d] [-i inet_conf] [-v]
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*
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* -a: complain about implicit "allow" at end of rule.
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*
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* -d: rules in current directory.
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*
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* -i: location of inetd.conf file.
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*
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* -v: show all rules.
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*
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* Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
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*/
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#ifndef lint
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static char sccsid[] = "@(#) tcpdchk.c 1.8 97/02/12 02:13:25";
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#endif
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/* System libraries. */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <syslog.h>
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#include <setjmp.h>
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#include <errno.h>
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#include <netdb.h>
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#include <string.h>
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extern int errno;
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extern void exit();
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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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#endif
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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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/* Application-specific. */
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#include "tcpd.h"
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#include "inetcf.h"
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#include "scaffold.h"
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/*
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* Stolen from hosts_access.c...
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*/
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static char sep[] = ", \t\n";
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#define BUFLEN 2048
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int resident = 0;
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int hosts_access_verbose = 0;
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char *hosts_allow_table = HOSTS_ALLOW;
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char *hosts_deny_table = HOSTS_DENY;
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extern jmp_buf tcpd_buf;
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/*
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* Local stuff.
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*/
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static void usage();
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static void parse_table();
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static void print_list();
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static void check_daemon_list();
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static void check_client_list();
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static void check_daemon();
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static void check_user();
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static int check_host();
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static int reserved_name();
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#define PERMIT 1
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#define DENY 0
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#define YES 1
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#define NO 0
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static int defl_verdict;
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static char *myname;
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static int allow_check;
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static char *inetcf;
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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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struct request_info request;
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struct stat st;
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int c;
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myname = argv[0];
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/*
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* Parse the JCL.
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*/
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while ((c = getopt(argc, argv, "adi:v")) != EOF) {
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switch (c) {
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case 'a':
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allow_check = 1;
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break;
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case 'd':
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hosts_allow_table = "hosts.allow";
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hosts_deny_table = "hosts.deny";
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break;
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case 'i':
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inetcf = optarg;
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break;
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case 'v':
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hosts_access_verbose++;
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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}
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if (argc != optind)
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usage();
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/*
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* 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);
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} else if (!S_ISDIR(st.st_mode)) {
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tcpd_warn("REAL_DAEMON_DIR %s is not a directory", REAL_DAEMON_DIR);
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}
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/*
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* Process the inet configuration file (or its moral equivalent). This
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* information is used later to find references in hosts.allow/deny to
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* unwrapped services, and other possible problems.
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*/
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inetcf = inet_cfg(inetcf);
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if (hosts_access_verbose)
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printf("Using network configuration file: %s\n", inetcf);
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/*
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* These are not run from inetd but may have built-in access control.
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*/
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inet_set("portmap", WR_NOT);
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inet_set("rpcbind", WR_NOT);
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/*
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* Check accessibility of access control files.
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*/
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(void) check_path(hosts_allow_table, &st);
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(void) check_path(hosts_deny_table, &st);
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/*
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* Fake up an arbitrary service request.
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*/
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request_init(&request,
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RQ_DAEMON, "daemon_name",
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RQ_SERVER_NAME, "server_hostname",
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RQ_SERVER_ADDR, "server_addr",
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RQ_USER, "user_name",
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RQ_CLIENT_NAME, "client_hostname",
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RQ_CLIENT_ADDR, "client_addr",
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RQ_FILE, 1,
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0);
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/*
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* Examine all access-control rules.
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*/
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defl_verdict = PERMIT;
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parse_table(hosts_allow_table, &request);
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defl_verdict = DENY;
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parse_table(hosts_deny_table, &request);
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return (0);
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}
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/* usage - explain */
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static void usage()
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{
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fprintf(stderr, "usage: %s [-a] [-d] [-i inet_conf] [-v]\n", myname);
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fprintf(stderr, " -a: report rules with implicit \"ALLOW\" at end\n");
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fprintf(stderr, " -d: use allow/deny files in current directory\n");
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fprintf(stderr, " -i: location of inetd.conf file\n");
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fprintf(stderr, " -v: list all rules\n");
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exit(1);
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}
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/* parse_table - like table_match(), but examines _all_ entries */
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static void parse_table(table, request)
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char *table;
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struct request_info *request;
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{
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FILE *fp;
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int real_verdict;
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char sv_list[BUFLEN]; /* becomes list of daemons */
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char *cl_list; /* becomes list of requests */
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char *sh_cmd; /* becomes optional shell command */
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char buf[BUFSIZ];
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int verdict;
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struct tcpd_context saved_context;
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saved_context = tcpd_context; /* stupid compilers */
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if (fp = fopen(table, "r")) {
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tcpd_context.file = table;
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tcpd_context.line = 0;
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while (xgets(sv_list, sizeof(sv_list), fp)) {
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if (sv_list[strlen(sv_list) - 1] != '\n') {
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tcpd_warn("missing newline or line too long");
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continue;
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}
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if (sv_list[0] == '#' || sv_list[strspn(sv_list, " \t\r\n")] == 0)
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continue;
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if ((cl_list = split_at(sv_list, ':')) == 0) {
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tcpd_warn("missing \":\" separator");
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continue;
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}
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sh_cmd = split_at(cl_list, ':');
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if (hosts_access_verbose)
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printf("\n>>> Rule %s line %d:\n",
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tcpd_context.file, tcpd_context.line);
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if (hosts_access_verbose)
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print_list("daemons: ", sv_list);
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check_daemon_list(sv_list);
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if (hosts_access_verbose)
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print_list("clients: ", cl_list);
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check_client_list(cl_list);
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#ifdef PROCESS_OPTIONS
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real_verdict = defl_verdict;
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if (sh_cmd) {
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verdict = setjmp(tcpd_buf);
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if (verdict != 0) {
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real_verdict = (verdict == AC_PERMIT);
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} else {
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dry_run = 1;
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process_options(sh_cmd, request);
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if (dry_run == 1 && real_verdict && allow_check)
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tcpd_warn("implicit \"allow\" at end of rule");
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}
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} else if (defl_verdict && allow_check) {
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tcpd_warn("implicit \"allow\" at end of rule");
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}
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if (hosts_access_verbose)
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printf("access: %s\n", real_verdict ? "granted" : "denied");
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#else
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if (sh_cmd)
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shell_cmd(percent_x(buf, sizeof(buf), sh_cmd, request));
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if (hosts_access_verbose)
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printf("access: %s\n", defl_verdict ? "granted" : "denied");
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#endif
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}
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(void) fclose(fp);
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} else if (errno != ENOENT) {
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tcpd_warn("cannot open %s: %m", table);
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}
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tcpd_context = saved_context;
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}
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/* print_list - pretty-print a list */
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static void print_list(title, list)
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char *title;
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char *list;
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{
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char buf[BUFLEN];
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char *cp;
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char *next;
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fputs(title, stdout);
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strcpy(buf, list);
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for (cp = strtok(buf, sep); cp != 0; cp = next) {
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fputs(cp, stdout);
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next = strtok((char *) 0, sep);
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if (next != 0)
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fputs(" ", stdout);
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}
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fputs("\n", stdout);
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}
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/* check_daemon_list - criticize daemon list */
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static void check_daemon_list(list)
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char *list;
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{
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char buf[BUFLEN];
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char *cp;
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char *host;
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int daemons = 0;
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strcpy(buf, list);
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for (cp = strtok(buf, sep); cp != 0; cp = strtok((char *) 0, sep)) {
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if (STR_EQ(cp, "EXCEPT")) {
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daemons = 0;
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} else {
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daemons++;
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if ((host = split_at(cp + 1, '@')) != 0 && check_host(host) > 1) {
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tcpd_warn("host %s has more than one address", host);
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tcpd_warn("(consider using an address instead)");
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}
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check_daemon(cp);
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}
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}
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if (daemons == 0)
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tcpd_warn("daemon list is empty or ends in EXCEPT");
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}
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/* check_client_list - criticize client list */
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static void check_client_list(list)
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char *list;
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{
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char buf[BUFLEN];
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char *cp;
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char *host;
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int clients = 0;
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strcpy(buf, list);
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for (cp = strtok(buf, sep); cp != 0; cp = strtok((char *) 0, sep)) {
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if (STR_EQ(cp, "EXCEPT")) {
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clients = 0;
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} else {
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clients++;
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if (host = split_at(cp + 1, '@')) { /* user@host */
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check_user(cp);
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check_host(host);
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} else {
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check_host(cp);
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}
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}
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}
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if (clients == 0)
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tcpd_warn("client list is empty or ends in EXCEPT");
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}
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/* check_daemon - criticize daemon pattern */
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static void check_daemon(pat)
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char *pat;
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{
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if (pat[0] == '@') {
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tcpd_warn("%s: daemon name begins with \"@\"", pat);
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} else if (pat[0] == '.') {
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tcpd_warn("%s: daemon name begins with dot", pat);
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} else if (pat[strlen(pat) - 1] == '.') {
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tcpd_warn("%s: daemon name ends in dot", pat);
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} else if (STR_EQ(pat, "ALL") || STR_EQ(pat, unknown)) {
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/* void */ ;
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} else if (STR_EQ(pat, "FAIL")) { /* obsolete */
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tcpd_warn("FAIL is no longer recognized");
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tcpd_warn("(use EXCEPT or DENY instead)");
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} else if (reserved_name(pat)) {
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tcpd_warn("%s: daemon name may be reserved word", pat);
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} else {
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switch (inet_get(pat)) {
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case WR_UNKNOWN:
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tcpd_warn("%s: no such process name in %s", pat, inetcf);
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inet_set(pat, WR_YES); /* shut up next time */
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break;
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case WR_NOT:
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tcpd_warn("%s: service possibly not wrapped", pat);
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inet_set(pat, WR_YES);
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break;
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}
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}
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}
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/* check_user - criticize user pattern */
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static void check_user(pat)
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char *pat;
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{
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if (pat[0] == '@') { /* @netgroup */
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tcpd_warn("%s: user name begins with \"@\"", pat);
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} else if (pat[0] == '.') {
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tcpd_warn("%s: user name begins with dot", pat);
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} else if (pat[strlen(pat) - 1] == '.') {
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tcpd_warn("%s: user name ends in dot", pat);
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} else if (STR_EQ(pat, "ALL") || STR_EQ(pat, unknown)
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|| STR_EQ(pat, "KNOWN")) {
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/* void */ ;
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} else if (STR_EQ(pat, "FAIL")) { /* obsolete */
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tcpd_warn("FAIL is no longer recognized");
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tcpd_warn("(use EXCEPT or DENY instead)");
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} else if (reserved_name(pat)) {
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tcpd_warn("%s: user name may be reserved word", pat);
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}
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}
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/* check_host - criticize host pattern */
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static int check_host(pat)
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char *pat;
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{
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char *mask;
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int addr_count = 1;
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if (pat[0] == '@') { /* @netgroup */
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#ifdef NO_NETGRENT
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/* SCO has no *netgrent() support */
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#else
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#ifdef NETGROUP
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char *machinep;
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char *userp;
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char *domainp;
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setnetgrent(pat + 1);
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if (getnetgrent(&machinep, &userp, &domainp) == 0)
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tcpd_warn("%s: unknown or empty netgroup", pat + 1);
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endnetgrent();
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#else
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tcpd_warn("netgroup support disabled");
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#endif
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#endif
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} else if (mask = split_at(pat, '/')) { /* network/netmask */
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if (dot_quad_addr(pat) == INADDR_NONE
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|| dot_quad_addr(mask) == INADDR_NONE)
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tcpd_warn("%s/%s: bad net/mask pattern", pat, mask);
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} else if (STR_EQ(pat, "FAIL")) { /* obsolete */
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tcpd_warn("FAIL is no longer recognized");
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tcpd_warn("(use EXCEPT or DENY instead)");
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} else if (reserved_name(pat)) { /* other reserved */
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/* void */ ;
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} else if (NOT_INADDR(pat)) { /* internet name */
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if (pat[strlen(pat) - 1] == '.') {
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tcpd_warn("%s: domain or host name ends in dot", pat);
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} else if (pat[0] != '.') {
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addr_count = check_dns(pat);
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}
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} else { /* numeric form */
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if (STR_EQ(pat, "0.0.0.0") || STR_EQ(pat, "255.255.255.255")) {
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/* void */ ;
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} else if (pat[0] == '.') {
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tcpd_warn("%s: network number begins with dot", pat);
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} else if (pat[strlen(pat) - 1] != '.') {
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check_dns(pat);
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}
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}
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return (addr_count);
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}
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/* reserved_name - determine if name is reserved */
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static int reserved_name(pat)
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char *pat;
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{
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return (STR_EQ(pat, unknown)
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|| STR_EQ(pat, "KNOWN")
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|| STR_EQ(pat, paranoid)
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|| STR_EQ(pat, "ALL")
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|| STR_EQ(pat, "LOCAL"));
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}
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