* authorized by the /etc/hosts.{allow,deny} files. The local system is
* always treated as an authorized host. The access control tables are never
* consulted for requests from the local system, and are always consulted
- * for requests from other hosts. Access control is based on IP addresses
- * only; attempts to map an address to a host name might cause the
- * portmapper to hang.
+ * for requests from other hosts.
*
* Author: Wietse Venema (wietse@wzv.win.tue.nl), dept. of Mathematics and
* Computing Science, Eindhoven University of Technology, The Netherlands.
*/
-#include "tcpwrapper.h"
-
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <tcpwrapper.h>
#include <unistd.h>
#include <string.h>
#include <rpc/rpc.h>
#include <rpc/rpcent.h>
#endif
-static void logit();
-static void toggle_verboselog();
+static void logit(int severity, struct sockaddr_in *addr,
+ u_long procnum, u_long prognum, char *text);
+static void toggle_verboselog(int sig);
int verboselog = 0;
int allow_severity = LOG_INFO;
int deny_severity = LOG_WARNING;
/* A handful of macros for "readability". */
+#ifdef HAVE_LIBWRAP
/* coming from libwrap.a (tcp_wrappers) */
extern int hosts_ctl(char *daemon, char *name, char *addr, char *user);
+#else
+int hosts_ctl(char *daemon, char *name, char *addr, char *user)
+{
+ return 0;
+}
+#endif
#define legal_port(a,p) \
(ntohs((a)->sin_port) < IPPORT_RESERVED || (p) >= IPPORT_RESERVED)
#define log_client(addr, proc, prog) \
logit(allow_severity, addr, proc, prog, "")
+#define ALLOW 1
+#define DENY 0
+
int
good_client(daemon, addr)
char *daemon;
char **sp;
char *tmpname;
- /* Check the IP address first. */
- if (hosts_ctl(daemon, "", inet_ntoa(addr->sin_addr), ""))
- return 1;
-
- /* Check the hostname. */
- hp = gethostbyaddr ((const char *) &(addr->sin_addr),
- sizeof (addr->sin_addr), AF_INET);
-
- if (!hp)
- return 0;
-
- /* must make sure the hostent is authorative. */
- tmpname = alloca (strlen (hp->h_name) + 1);
- strcpy (tmpname, hp->h_name);
- hp = gethostbyname(tmpname);
- if (hp) {
- /* now make sure the "addr->sin_addr" is on the list */
+ /* First check the address. */
+ if (hosts_ctl(daemon, "", inet_ntoa(addr->sin_addr), "") == DENY)
+ return DENY;
+
+ /* Now do the hostname lookup */
+ hp = gethostbyaddr ((const char *) &(addr->sin_addr),
+ sizeof (addr->sin_addr), AF_INET);
+ if (!hp)
+ return DENY; /* never heard of it. misconfigured DNS? */
+
+ /* Make sure the hostent is authorative. */
+ tmpname = strdup(hp->h_name);
+ if (!tmpname)
+ return DENY;
+ hp = gethostbyname(tmpname);
+ free(tmpname);
+ if (!hp)
+ return DENY; /* never heard of it. misconfigured DNS? */
+
+ /* Now make sure the address is on the list */
for (sp = hp->h_addr_list ; *sp ; sp++) {
- if (memcmp(*sp, &(addr->sin_addr), hp->h_length)==0)
- break;
+ if (memcmp(*sp, &(addr->sin_addr), hp->h_length) == 0)
+ break;
}
if (!*sp)
- /* it was a FAKE. */
- return 0;
- }
- else
- /* never heard of it. misconfigured DNS? */
- return 0;
-
- /* Check the official name first. */
- if (hosts_ctl(daemon, "", hp->h_name, ""))
- return 1;
-
- /* Check aliases. */
- for (sp = hp->h_aliases; *sp ; sp++) {
- if (hosts_ctl(daemon, "", *sp, ""))
- return 1;
- }
-
- /* No match */
- return 0;
+ return DENY; /* it was a FAKE. */
+
+ /* Check the official name and address. */
+ if (hosts_ctl(daemon, hp->h_name, inet_ntoa(addr->sin_addr), "") == DENY)
+ return DENY;
+
+ /* Now check aliases. */
+ for (sp = hp->h_aliases; *sp ; sp++) {
+ if (hosts_ctl(daemon, *sp, inet_ntoa(addr->sin_addr), "") == DENY)
+ return DENY;
+ }
+
+ return ALLOW;
}
/* check_startup - additional startup code */
-void check_startup()
+void check_startup(void)
{
/*
u_long proc;
u_long prog;
{
- if (!(from_local(addr) || good_client(daemon, addr))) {
- log_bad_host(addr, proc, prog);
- return (FALSE);
- }
- if (verboselog)
- log_client(addr, proc, prog);
+ if (!(from_local(addr) || good_client(daemon, addr))) {
+ log_bad_host(addr, proc, prog);
+ return (FALSE);
+ }
+ if (verboselog)
+ log_client(addr, proc, prog);
+
return (TRUE);
}
/* check_privileged_port - additional checks for privileged-port updates */
int
-check_privileged_port(addr, proc, prog, port)
-struct sockaddr_in *addr;
-u_long proc;
-u_long prog;
-u_long port;
+check_privileged_port(struct sockaddr_in *addr,
+ u_long proc, u_long prog, u_long port)
{
#ifdef CHECK_PORT
if (!legal_port(addr, port)) {
/* toggle_verboselog - toggle verbose logging flag */
-static void toggle_verboselog(sig)
-int sig;
+static void toggle_verboselog(int sig)
{
(void) signal(sig, toggle_verboselog);
verboselog = !verboselog;
/* logit - report events of interest via the syslog daemon */
-static void logit(severity, addr, procnum, prognum, text)
-int severity;
-struct sockaddr_in *addr;
-u_long procnum;
-u_long prognum;
-char *text;
+static void logit(int severity, struct sockaddr_in *addr,
+ u_long procnum, u_long prognum, char *text)
{
char *procname;
char procbuf[16 + 4 * sizeof(u_long)];
projects / nfs-utils.git / blobdiff