finalise 2.1.2

[authbind.git] / authbind.1

diff --git a/authbind.1 b/authbind.1
index 74d44d727d9ec00931c4bd6ec1dc601a5b5c5066..d73e998990a92e6139d5c2ef6165f7aaac8e0569 100644 (file)
--- a/authbind.1
+++ b/authbind.1
@@ -146,21 +146,47 @@ cannot be accessed, then not only will
 fail, but an error message will be printed to stderr.  Unrecognised
 lines in
 .BI /etc/authbind/byuid/ uid
 fail, but an error message will be printed to stderr.  Unrecognised
 lines in
 .BI /etc/authbind/byuid/ uid

-files are silently ignored (as are lines whose
+files are silently ignored, as are lines whose

 .I addr
 has non-zero bits more than
 .I length
 .I addr
 has non-zero bits more than
 .I length

-from the top) or where some
+from the top or where some

 .I min
 is larger than
 .IR max .
 .I min
 is larger than
 .IR max .

-.PP
+.SH EXAMPLE
+So for example an attempt by uid 432
+to bind to port 80 of address [2620:106:e002:f00f::21]
+would result in authbind calling
+.I access(2)
+on, in order,
+.RS
+.B /etc/authbind/byport/80
+.br
+.B /etc/authbind/byaddr/2620:106:e002:f00f::21,80
+.br
+.B /etc/authbind/byaddr/2620:106:e002:f00f:0:0:0:21,80
+.RE
+If none of these files exist, authbind will read
+.RS
+.B /etc/authbind/byuid/432
+.RE
+and search for a line to permit
+the relevant access; examples of lines which would do so are:
+.RS
+.B 2620:106:e002:f00f::21,80
+.br
+.B ::/0,80
+.RE
+.SH PORTS 512-1023

 Authorising binding to ports from 512 to 1023 inclusive is
 not recommended.  Some protocols (including some versions of NFS)
 authorise clients by seeing that they are using a port number in this
 range.  So by authorising a program to be a server for such a port,
 you are also authorising it to impersonate the whole host for those
 Authorising binding to ports from 512 to 1023 inclusive is
 not recommended.  Some protocols (including some versions of NFS)
 authorise clients by seeing that they are using a port number in this
 range.  So by authorising a program to be a server for such a port,
 you are also authorising it to impersonate the whole host for those

-protocols.  To make sure that this isn't done by accident,
+protocols.
+
+To make sure that this isn't done by accident,

 if the port number requested is in the range 512-1023, authbind
 will expect the permission files to have an additional
 .B !
 if the port number requested is in the range 512-1023, authbind
 will expect the permission files to have an additional
 .B !