diff --git a/configure.ac b/configure.ac index a601168a8b09..7f42760e00ed 100644 --- a/configure.ac +++ b/configure.ac @@ -1665,6 +1665,62 @@ else AC_MSG_RESULT([no]) fi +# 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 $LIBS" + AC_MSG_CHECKING([for libwrap]) + AC_LINK_IFELSE([AC_LANG_PROGRAM([[ +#include +#include +#include +#include +int deny_severity = 0, allow_severity = 0; + ]], [[ + hosts_access(0); + ]])], [ + AC_MSG_RESULT([yes]) + AC_DEFINE([LIBWRAP], [1], + [Define if you want + TCP Wrappers support]) + SSHDLIBS="$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, @@ -5714,6 +5770,7 @@ echo " PAM support: $PAM_MSG" echo " OSF SIA support: $SIA_MSG" echo " KerberosV support: $KRB5_MSG" echo " SELinux support: $SELINUX_MSG" +echo " TCP Wrappers support: $TCPW_MSG" echo " libedit support: $LIBEDIT_MSG" echo " libldns support: $LDNS_MSG" echo " Solaris process contract support: $SPC_MSG" diff --git a/sshd-session.c b/sshd-session.c index 4234523e85da..ac6cb7e8d4a3 100644 --- a/sshd-session.c +++ b/sshd-session.c @@ -70,6 +70,11 @@ #include #endif +#ifdef LIBWRAP +#include +#include +#endif /* LIBWRAP */ + #include "xmalloc.h" #include "ssh.h" #include "ssh2.h" @@ -1269,6 +1274,25 @@ main(int ac, char **av) audit_connection_from(ssh, remote_ip, remote_port); #endif +#ifdef LIBWRAP + int allow_severity = options.log_facility|LOG_INFO; + int deny_severity = options.log_facility|LOG_WARNING; + /* Check whether logins are denied from this host. */ + if (ssh_packet_connection_is_on_socket(ssh)) { + 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 */ + rdomain = ssh_packet_rdomain_in(ssh); /* Log the connection. */ diff --git a/sshd.8 b/sshd.8 index ce3b9228a293..aa8e0ff4039f 100644 --- a/sshd.8 +++ b/sshd.8 @@ -921,6 +921,12 @@ 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 ) . @@ -1048,6 +1054,7 @@ Each SSHv2 userauth type has its own PAM service name: .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 ,