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add -i to SYNOPSIS/usage() and sundry tweaks;
ok beck

.\"	$OpenBSD: ocspcheck.8,v 1.9 2017/11/29 21:15:45 jmc Exp $
.\"
.\" Copyright (c) 2017 Bob Beck <beck@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: November 29 2017 $
.Dt OCSPCHECK 8
.Os
.Sh NAME
.Nm ocspcheck
.Nd check a certificate for validity against its OCSP responder
.Sh SYNOPSIS
.Nm
.Op Fl Nv
.Op Fl C Ar CAfile
.Op Fl i Ar staplefile
.Op Fl o Ar staplefile
.Ar file
.Sh DESCRIPTION
The
.Nm
utility validates a PEM format certificate against the OCSP responder
encoded in the certificate specified by the
.Ar file
argument.
Normally it should be used for checking server certificates
and maintaining saved OCSP responses to be used for OCSP stapling.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl C Ar CAfile
Specify a PEM format root certificate bundle to use for the validation of
requests.
By default no certificates are used beyond those in the
certificate chain provided by the
.Ar file
argument.
.It Fl i Ar staplefile
Specify an input filename from which a DER-encoded OCSP response
will be read instead of fetching it from the OCSP server.
A filename
of
.Sq -
will read the response from standard input.
.It Fl N
Do not use a nonce value in the OCSP request, or validate that the
nonce was returned in the OCSP response.
By default a nonce is always used and validated when retrieving
a response from an OCSP server.
The use of this flag is a security risk as it will allow OCSP
responses to be replayed.
It should not be used unless the OCSP server does not support the
use of OCSP nonces.
.It Fl o Ar staplefile
Specify an output filename where the DER encoded response from the
OCSP server will be written, if the OCSP response validates.
A filename
of
.Sq -
will write the response to standard output.
By default the response is not saved.
.It Fl v
Increase verbosity.
This flag may be specified multiple times to get more verbose output.
The default behaviour is to be silent unless something goes wrong.
.El
.Sh EXIT STATUS
The
.Nm
utility exits 0 if the OCSP response validates for the certificate in
.Ar file
and all output is successfully written out.
.Nm
exits >0 if an error occurs or the OCSP response fails to validate.
.Sh SEE ALSO
.Xr nc 1 ,
.Xr tls_config_set_ocsp_staple_file 3 ,
.Xr tls_config_set_ocsp_staple_mem 3 ,
.Xr httpd 8
.Sh HISTORY
The
.Nm
utility first appeared in
.Ox 6.1 .
.Sh AUTHORS
.Nm
was written by
.An Bob Beck .
.Sh CAVEATS
While
.Nm
could possibly be used in scripts to query responders for server
certificates seen on client connections, this is almost always a bad
idea.
God kills a kitten every time you make an OCSP query from the
client side of a TLS connection.
.Sh BUGS
.Nm
will create the output file if it does not exist.
On failure a newly created output file will not be removed.