===================================================================
RCS file: /cvs/mandoc/man.cgi.8,v
retrieving revision 1.7
retrieving revision 1.11
diff -u -p -r1.7 -r1.11
--- mandoc/man.cgi.8	2014/07/18 19:03:39	1.7
+++ mandoc/man.cgi.8	2014/09/14 19:44:28	1.11
@@ -1,4 +1,4 @@
-.\"     $Id: man.cgi.8,v 1.7 2014/07/18 19:03:39 schwarze Exp $
+.\"     $Id: man.cgi.8,v 1.11 2014/09/14 19:44:28 schwarze Exp $
 .\"
 .\" Copyright (c) 2014 Ingo Schwarze <schwarze@openbsd.org>
 .\"
@@ -14,7 +14,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: July 18 2014 $
+.Dd $Mdocdate: September 14 2014 $
 .Dt MAN.CGI 8
 .Os
 .Sh NAME
@@ -43,6 +43,12 @@ either a name of a manual page or an
 using the syntax described in the
 .Xr apropos 1
 manual; filling this in is required for each search.
+.Pp
+The expression is broken into words at whitespace.
+Whitespace characters and backslashes can be escaped
+by prepending a backslash.
+The effect of prepending a backslash to another character is undefined;
+in the current implementation, it has no effect.
 .It
 A
 .Dq Submit
@@ -189,6 +195,11 @@ element.
 An ASCII string to be used for the HTML
 .Aq TITLE
 element.
+.It Ev HTTP_HOST
+The FQDN of the (possibly virtual) host the HTTP server is running on.
+This is used for
+.Ic Location:
+headers in HTTP 303 responses.
 .It Ev MAN_DIR
 A path to the
 .Nm
@@ -262,6 +273,34 @@ For backward compatibility with the traditional
 is supported as an alias for
 .Cm sec .
 .El
+.Ss Restricted character set
+For security reasons, in particular to prevent cross site scripting
+attacks, some strings used by
+.Nm
+can only contain the following characters:
+.Pp
+.Bl -dash -compact -offset indent
+.It
+lower case and upper case ASCII letters
+.It
+the ten decimal digits
+.It
+the dash
+.Pq Sq -
+.It
+the dot
+.Pq Sq \&.
+.It
+the slash
+.Pq Sq /
+.It
+the underscore
+.Pq Sq _
+.El
+.Pp
+In particular, this applies to the
+.Ev SCRIPT_NAME ,
+to all manpaths, and to all architecture names.
 .Sh ENVIRONMENT
 The web server may pass the following CGI variables to
 .Nm :
@@ -274,7 +313,7 @@ and ending before the
 .Ev QUERY_STRING .
 It is used by the
 .Cm show
-page to aquire the manpath and filename it needs.
+page to acquire the manpath and filename it needs.
 .It Ev QUERY_STRING
 The HTTP query string passed from the client to the server.
 It is the final part of the URI, after the question mark.
@@ -288,6 +327,10 @@ binary relative to the server root, usually
 .Pa /cgi-bin/man.cgi .
 This is used for generating URIs to be embedded
 in generated HTML code and HTTP headers.
+If this contains any character not contained in the
+.Sx Restricted character set ,
+.Nm
+reports an internal server error and exits without doing anything.
 .El
 .Sh FILES
 .Bl -tag -width Ds
@@ -327,6 +370,12 @@ Manual pages documenting
 itself, linked from the index page.
 .It Pa /man/manpath.conf
 The list of available manpaths, one per line.
+If any of the lines in this file contains a slash
+.Pq Sq /
+or any character not contained in the
+.Sx Restricted character set ,
+.Nm
+reports an internal server error and exits without doing anything.
 .It Pa /man/OpenBSD-current/man1/mandoc.1
 An example
 .Xr mdoc 7