X-Git-Url: https://git.distorted.org.uk/~mdw/fwd/blobdiff_plain/1c2054c7558f523dec9d7c1f243a2ceddd81c781..bdbbfcd4eb2f6e15270f558342630d964cb9f418:/fw.1

diff --git a/fw.1 b/fw.1
index 251aa5a..d90d9d9 100644
--- a/fw.1
+++ b/fw.1
@@ -1,6 +1,6 @@
 .\" -*-nroff-*-
 .\"
-.\" $Id: fw.1,v 1.16 2003/11/25 14:46:50 mdw Exp $
+.\" $Id: fw.1,v 1.17 2003/11/29 20:36:07 mdw Exp $
 .\"
 .\" Manual page for fw
 .\"
@@ -28,6 +28,9 @@
 .\" ---- Revision history ---------------------------------------------------
 .\" 
 .\" $Log: fw.1,v $
+.\" Revision 1.17  2003/11/29 20:36:07  mdw
+.\" Privileged outgoing connections.
+.\"
 .\" Revision 1.16  2003/11/25 14:46:50  mdw
 .\" Update docco for new options.
 .\"
@@ -1129,6 +1132,36 @@ which means to use whichever address the kernel thinks is most
 convenient.  This option is useful if the destination is doing
 host-based access control and your server is multi-homed.
 .OE
+.OS "Socket options"
+.B socket.inet.dest.priv-port
+.RB [=]
+.BR yes | no
+.OD
+Make a privileged connection (i.e., from a low-numbered port) to the
+target.  This only works if
+.B fw
+was started with root privileges.  However, it still works if
+.B fw
+has
+.I dropped
+privileges after initialization (the
+.B \-s
+option).  Before dropping privileges, 
+.B fw
+forks off a separate process which continues to run with root
+privileges, and on demand passes sockets bound to privileged ports and
+connected to the appropriate peer back to the main program.  The
+privileged child only passes back sockets connected to peer addresses
+named in the configuration; even if the
+.B fw
+process is compromised, it can't make privileged connections to other
+addresses.  Note that because of this privilege separation, it's also
+not possible to reconfigure
+.B fw
+to make privileged connections to different peer addresses later. by
+changing configuration files and sending the daemon a
+.BR SIGHUP .
+.OE
 .PP
 The access control rules are examined in the order: local entries first,
 then global ones, each in the order given in the configuration file.
@@ -1555,6 +1588,10 @@ exec
 .RB [ = ]
 .BR any | \c
 .I addr
+.br
+.B socket.inet.dest.priv-port
+.RB [=]
+.BR yes | no
 .PP
 .BR socket.unix.fattr. *
 .