3 files changed, 89 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index 84bfad8c5..3b30736b3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1503,6 +1503,62 @@ AC_ARG_WITH([skey],
         ]
 )
 
+# Check whether user wants TCP wrappers support
+TCPW_MSG="no"
+AC_ARG_WITH([tcp-wrappers],
+        [  --with-tcp-wrappers[[=PATH]] Enable tcpwrappers support (optionally in PATH)],
+        [
+                if test "x$withval" != "xno" ; then
+                        saved_LIBS="$LIBS"
+                        saved_LDFLAGS="$LDFLAGS"
+                        saved_CPPFLAGS="$CPPFLAGS"
+                        if test -n "${withval}" && \
+                            test "x${withval}" != "xyes"; then
+                                if test -d "${withval}/lib"; then
+                                        if test -n "${need_dash_r}"; then
+                                                LDFLAGS="-L${withval}/lib -R${withval}/lib ${LDFLAGS}"
+                                        else
+                                                LDFLAGS="-L${withval}/lib ${LDFLAGS}"
+                                        fi
+                                else
+                                        if test -n "${need_dash_r}"; then
+                                                LDFLAGS="-L${withval} -R${withval} ${LDFLAGS}"
+                                        else
+                                                LDFLAGS="-L${withval} ${LDFLAGS}"
+                                        fi
+                                fi
+                                if test -d "${withval}/include"; then
+                                        CPPFLAGS="-I${withval}/include ${CPPFLAGS}"
+                                else
+                                        CPPFLAGS="-I${withval} ${CPPFLAGS}"
+                                fi
+                        fi
+                        LIBS="-lwrap $LIBS"
+                        AC_MSG_CHECKING([for libwrap])
+                        AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <tcpd.h>
+int deny_severity = 0, allow_severity = 0;
+                                ]], [[
+        hosts_access(0);
+                                ]])], [
+                                        AC_MSG_RESULT([yes])
+                                        AC_DEFINE([LIBWRAP], [1],
+                                                [Define if you want
+                                                TCP Wrappers support])
+                                        SSHDLIBS="$SSHDLIBS -lwrap"
+                                        TCPW_MSG="yes"
+                                ], [
+                                        AC_MSG_ERROR([*** libwrap missing])
+                                
+                        ])
+                        LIBS="$saved_LIBS"
+                fi
+        ]
+)
+
 # Check whether user wants to use ldns
 LDNS_MSG="no"
 AC_ARG_WITH(ldns,
@@ -5133,6 +5189,7 @@ echo "                 KerberosV support: $KRB5_MSG"
 echo "                   SELinux support: $SELINUX_MSG"
 echo "                 Smartcard support: $SCARD_MSG"
 echo "                     S/KEY support: $SKEY_MSG"
+echo "              TCP Wrappers support: $TCPW_MSG"
 echo "              MD5 password support: $MD5_MSG"
 echo "                   libedit support: $LIBEDIT_MSG"
 echo "                   libldns support: $LDNS_MSG"
diff --git a/sshd.8 b/sshd.8
index a4201146b..2ed523a2c 100644
--- a/sshd.8
+++ b/sshd.8
@@ -839,6 +839,12 @@ the user's home directory becomes accessible.
 This file should be writable only by the user, and need not be
 readable by anyone else.
 .Pp
+.It Pa /etc/hosts.allow
+.It Pa /etc/hosts.deny
+Access controls that should be enforced by tcp-wrappers are defined here.
+Further details are described in
+.Xr hosts_access 5 .
+.Pp
 .It Pa /etc/hosts.equiv
 This file is for host-based authentication (see
 .Xr ssh 1 ) .
@@ -943,6 +949,7 @@ The content of this file is not sensitive; it can be world-readable.
 .Xr ssh-keygen 1 ,
 .Xr ssh-keyscan 1 ,
 .Xr chroot 2 ,
+.Xr hosts_access 5 ,
 .Xr login.conf 5 ,
 .Xr moduli 5 ,
 .Xr sshd_config 5 ,
diff --git a/sshd.c b/sshd.c
index 45e50fac3..a66e9ca6c 100644
--- a/sshd.c
+++ b/sshd.c
@@ -126,6 +126,13 @@
 #include <Security/AuthSession.h>
 #endif
 
+#ifdef LIBWRAP
+#include <tcpd.h>
+#include <syslog.h>
+int allow_severity;
+int deny_severity;
+#endif /* LIBWRAP */
+
 /* Re-exec fds */
 #define REEXEC_DEVCRYPTO_RESERVED_FD    (STDERR_FILENO + 1)
 #define REEXEC_STARTUP_PIPE_FD          (STDERR_FILENO + 2)
@@ -1987,6 +1994,24 @@ main(int ac, char **av)
 #ifdef SSH_AUDIT_EVENTS
         audit_connection_from(remote_ip, remote_port);
 #endif
+#ifdef LIBWRAP
+        allow_severity = options.log_facility|LOG_INFO;
+        deny_severity = options.log_facility|LOG_WARNING;
+        /* Check whether logins are denied from this host. */
+        if (packet_connection_is_on_socket()) {
+                struct request_info req;
+
+                request_init(&req, RQ_DAEMON, __progname, RQ_FILE, sock_in, 0);
+                fromhost(&req);
+
+                if (!hosts_access(&req)) {
+                        debug("Connection refused by tcp wrapper");
+                        refuse(&req);
+                        /* NOTREACHED */
+                        fatal("libwrap refuse returns");
+                }
+        }
+#endif /* LIBWRAP */
 
         /* Log the connection. */
         laddr = get_local_ipaddr(sock_in);