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PREVENT UNAUTHORIZED USE OF YOUR HOSTS AS SMTP RELAY
Miquel van Smoorenburg <miquels@cistron.nl> 14-Jun-1996
The patch at the end of this file adds a new option to sendmail,
`W' or `TcpWrappers'. This makes it possible for precompiled distributions
to ship binaries compiled with -DTCPWRAPPERS without any unexpected
side-effects, since the option is off by default.
Here's the diff to the sendmail-8.8.5 source:
diff -ru sendmail-8.8.5.orig/src/conf.c sendmail-8.8.5/src/conf.c
--- sendmail-8.8.5.orig/src/conf.c Tue Jan 21 16:47:13 1997
+++ sendmail-8.8.5/src/conf.c Tue Jun 3 14:26:44 1997
@@ -4026,7 +4029,8 @@
return FALSE;
#if TCPWRAPPERS
- if (!hosts_ctl("sendmail", hostname, anynet_ntoa(sap), STRING_UNKNOWN))
+ if (TcpWrappers &&
+ !hosts_ctl("sendmail", hostname, anynet_ntoa(sap), STRING_UNKNOWN))
{
# ifdef LOG
if (LogLevel >= 4)
diff -ru sendmail-8.8.5.orig/src/readcf.c sendmail-8.8.5/src/readcf.c
--- sendmail-8.8.5.orig/src/readcf.c Wed Jan 15 02:51:29 1997
+++ sendmail-8.8.5/src/readcf.c Tue Jun 3 15:19:48 1997
@@ -1424,6 +1424,9 @@
{ "FallbackMXhost", 'V', FALSE },
{ "Verbose", 'v', TRUE },
{ "TryNullMXList", 'w', FALSE },
+#ifdef TCPWRAPPERS
+ { "TcpWrappers", 'W', TRUE },
+#endif
{ "QueueLA", 'x', FALSE },
{ "RefuseLA", 'X', FALSE },
{ "RecipientFactor", 'y', FALSE },
@@ -2069,6 +2072,11 @@
break;
/* 'W' available -- was wizard password */
+#ifdef TCPWRAPPERS
+ case 'W':
+ TcpWrappers = atobool(val);
+ break;
+#endif
case 'x': /* load avg at which to auto-queue msgs */
QueueLA = atoi(val);
diff -ru sendmail-8.8.5.orig/src/sendmail.8 sendmail-8.8.5/src/sendmail.8
--- sendmail-8.8.5.orig/src/sendmail.8 Fri Jan 17 00:25:50 1997
+++ sendmail-8.8.5/src/sendmail.8 Tue Jun 3 15:03:28 1997
@@ -432,6 +432,15 @@
This may not be available if your sendmail does not have the
.Dv USERDB
option compiled in.
+.It Li TcpWrappers
+Use the
+.Dv sendmail
+entry in
+.Pa /etc/hosts.allow
+to decide if the remote host has access to the SMTP port.
+This may not be available if your sendmail does not have the
+.Dv TCPWRAPPERS
+option compiled in.
.It Li ForkEachJob
Fork each job during queue runs.
May be convenient on memory-poor machines.
diff -ru sendmail-8.8.5.orig/src/sendmail.h sendmail-8.8.5/src/sendmail.h
--- sendmail-8.8.5.orig/src/sendmail.h Wed Jan 15 02:51:29 1997
+++ sendmail-8.8.5/src/sendmail.h Tue Jun 3 14:25:43 1997
@@ -1168,6 +1168,9 @@
#ifdef _FFR_DSN_RRT
EXTERN bool RrtImpliesDsn; /* turn Return-Receipt-To: into DSN */
#endif
+#ifdef TCPWRAPPERS
+EXTERN bool TcpWrappers; /* Use tcp wrappers for access control. */
+#endif
EXTERN bool IgnoreHostStatus; /* ignore long term host status files */
EXTERN bool SingleThreadDelivery; /* single thread hosts on delivery */
EXTERN bool UnsafeGroupWrites; /* group-writable files are unsafe */
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