summaryrefslogtreecommitdiffstats
path: root/source/n/openssh/openssh.tcp_wrappers.diff
blob: 38e3b3b4ebaea507816b5005d579514b2a54763e (about) (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
--- ./configure.ac.orig	2019-04-17 17:52:57.000000000 -0500
+++ ./configure.ac	2019-04-18 15:13:25.404941727 -0500
@@ -1494,6 +1494,62 @@
 	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 -lnsl $LIBS"
+			AC_MSG_CHECKING([for libwrap])
+			AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <tcpd.h>
+int deny_severity = 0, allow_severity = 0;
+				]], [[
+	hosts_access(0);
+				]])], [
+					AC_MSG_RESULT([yes])
+					AC_DEFINE([LIBWRAP], [1],
+						[Define if you want
+						TCP Wrappers support])
+					SSHDLIBS="$SSHDLIBS -lwrap -lnsl"
+					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,
@@ -5245,6 +5301,7 @@
 echo "                   OSF SIA support: $SIA_MSG"
 echo "                 KerberosV support: $KRB5_MSG"
 echo "                   SELinux support: $SELINUX_MSG"
+echo "              TCP Wrappers support: $TCPW_MSG"
 echo "              MD5 password support: $MD5_MSG"
 echo "                   libedit support: $LIBEDIT_MSG"
 echo "                   libldns support: $LDNS_MSG"
--- ./sshd.c.orig	2019-04-17 17:52:57.000000000 -0500
+++ ./sshd.c	2019-04-18 15:13:25.406941726 -0500
@@ -122,6 +122,12 @@
 #include "auth-options.h"
 #include "version.h"
 #include "ssherr.h"
+#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)
@@ -2022,6 +2028,26 @@
 	the_active_state = ssh;
 	ssh_packet_set_server(ssh);
 
+/* Moved LIBWRAP check here */
+#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 (ssh_packet_connection_is_on_socket(ssh)) {	/* This check must be after ssh_packet_set_connection() */
+		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 */
+
 	check_ip_options(ssh);
 
 	/* Prepare the channels layer */
--- ./sshd.8.orig	2019-04-17 17:52:57.000000000 -0500
+++ ./sshd.8	2019-04-18 15:13:25.407941726 -0500
@@ -873,6 +873,12 @@
 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 ) .
@@ -975,6 +981,7 @@
 .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 ,