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OCSP(1)				    OpenSSL			       OCSP(1)

       openssl-ocsp, ocsp - Online Certificate Status Protocol utility

       openssl ocsp [-help] [-out file]	[-issuer file] [-cert file] [-serial
       n] [-signer file] [-signkey file] [-sign_other file] [-no_certs]
       [-req_text] [-resp_text]	[-text]	[-reqout file] [-respout file] [-reqin
       file] [-respin file] [-nonce] [-no_nonce] [-url URL] [-host host:port]
       [-multi process-count] [-header]	[-path]	[-CApath dir] [-CAfile file]
       [-no-CAfile] [-no-CApath] [-attime timestamp] [-check_ss_sig]
       [-crl_check] [-crl_check_all] [-explicit_policy]	[-extended_crl]
       [-ignore_critical] [-inhibit_any] [-inhibit_map]	[-no_check_time]
       [-partial_chain]	[-policy arg] [-policy_check] [-policy_print]
       [-purpose purpose] [-suiteB_128]	[-suiteB_128_only] [-suiteB_192]
       [-trusted_first]	[-no_alt_chains] [-use_deltas] [-auth_level num]
       [-verify_depth num] [-verify_email email] [-verify_hostname hostname]
       [-verify_ip ip] [-verify_name name] [-x509_strict] [-VAfile file]
       [-validity_period n] [-status_age n] [-noverify]	[-verify_other file]
       [-trust_other] [-no_intern] [-no_signature_verify] [-no_cert_verify]
       [-no_chain] [-no_cert_checks] [-no_explicit] [-port num]	[-ignore_err]
       [-index file] [-CA file]	[-rsigner file]	[-rkey file] [-rother file]
       [-rsigopt nm:v] [-resp_no_certs]	[-nmin n] [-ndays n] [-resp_key_id]
       [-nrequest n] [-digest]

       The Online Certificate Status Protocol (OCSP) enables applications to
       determine the (revocation) state	of an identified certificate (RFC

       The ocsp	command	performs many common OCSP tasks. It can	be used	to
       print out requests and responses, create	requests and send queries to
       an OCSP responder and behave like a mini	OCSP server itself.

       This command operates as	either a client	or a server.  The options are
       described below,	divided	into those two modes.

   OCSP	Client Options
	   Print out a usage message.

       -out filename
	   specify output filename, default is standard	output.

       -issuer filename
	   This	specifies the current issuer certificate. This option can be
	   used	multiple times.	The certificate	specified in filename must be
	   in PEM format. This option MUST come	before any -cert options.

       -cert filename
	   Add the certificate filename	to the request.	The issuer certificate
	   is taken from the previous issuer option, or	an error occurs	if no
	   issuer certificate is specified.

       -serial num
	   Same	as the cert option except the certificate with serial number
	   num is added	to the request.	The serial number is interpreted as a
	   decimal integer unless preceded by 0x. Negative integers can	also
	   be specified	by preceding the value by a - sign.

       -signer filename, -signkey filename
	   Sign	the OCSP request using the certificate specified in the	signer
	   option and the private key specified	by the signkey option. If the
	   signkey option is not present then the private key is read from the
	   same	file as	the certificate. If neither option is specified	then
	   the OCSP request is not signed.

       -sign_other filename
	   Additional certificates to include in the signed request.

       -nonce, -no_nonce
	   Add an OCSP nonce extension to a request or disable OCSP nonce
	   addition.  Normally if an OCSP request is input using the reqin
	   option no nonce is added: using the nonce option will force
	   addition of a nonce.	 If an OCSP request is being created (using
	   cert	and serial options) a nonce is automatically added specifying
	   no_nonce overrides this.

       -req_text, -resp_text, -text
	   Print out the text form of the OCSP request,	response or both

       -reqout file, -respout file
	   Write out the DER encoded certificate request or response to	file.

       -reqin file, -respin file
	   Read	OCSP request or	response file from file. These option are
	   ignored if OCSP request or response creation	is implied by other
	   options (for	example	with serial, cert and host options).

       -url responder_url
	   Specify the responder URL. Both HTTP	and HTTPS (SSL/TLS) URLs can
	   be specified.

       -host hostname:port, -path pathname
	   If the host option is present then the OCSP request is sent to the
	   host	hostname on port port. path specifies the HTTP pathname	to use
	   or "/" by default.  This is equivalent to specifying	-url with
	   scheme http:// and the given	hostname, port,	and pathname.

       -header name=value
	   Adds	the header name	with the specified value to the	OCSP request
	   that	is sent	to the responder.  This	may be repeated.

       -timeout	seconds
	   Connection timeout to the OCSP responder in seconds.	 On POSIX
	   systems, when running as an OCSP responder, this option also	limits
	   the time that the responder is willing to wait for the client
	   request.  This time is measured from	the time the responder accepts
	   the connection until	the complete request is	received.

       -multi process-count
	   Run the specified number of OCSP responder child processes, with
	   the parent process respawning child processes as needed.  Child
	   processes will detect changes in the	CA index file and
	   automatically reload	it.  When running as a responder -timeout
	   option is recommended to limit the time each	child is willing to
	   wait	for the	client's OCSP response.	 This option is	available on
	   POSIX systems (that support the fork() and other required unix

       -CAfile file, -CApath pathname
	   File	or pathname containing trusted CA certificates.	These are used
	   to verify the signature on the OCSP response.

	   Do not load the trusted CA certificates from	the default file

	   Do not load the trusted CA certificates from	the default directory

       -attime,	-check_ss_sig, -crl_check, -crl_check_all, -explicit_policy,
       -extended_crl, -ignore_critical,	-inhibit_any, -inhibit_map,
       -no_alt_chains, -no_check_time, -partial_chain, -policy,	-policy_check,
       -policy_print, -purpose,	-suiteB_128, -suiteB_128_only, -suiteB_192,
       -trusted_first, -use_deltas, -auth_level, -verify_depth,	-verify_email,
       -verify_hostname, -verify_ip, -verify_name, -x509_strict
	   Set different certificate verification options.  See	verify(1)
	   manual page for details.

       -verify_other file
	   File	containing additional certificates to search when attempting
	   to locate the OCSP response signing certificate. Some responders
	   omit	the actual signer's certificate	from the response: this	option
	   can be used to supply the necessary certificate in such cases.

	   The certificates specified by the -verify_other option should be
	   explicitly trusted and no additional	checks will be performed on
	   them. This is useful	when the complete responder certificate	chain
	   is not available or trusting	a root CA is not appropriate.

       -VAfile file
	   File	containing explicitly trusted responder	certificates.
	   Equivalent to the -verify_other and -trust_other options.

	   Don't attempt to verify the OCSP response signature or the nonce
	   values. This	option will normally only be used for debugging	since
	   it disables all verification	of the responders certificate.

	   Ignore certificates contained in the	OCSP response when searching
	   for the signers certificate.	With this option the signers
	   certificate must be specified with either the -verify_other or
	   -VAfile options.

	   Don't check the signature on	the OCSP response. Since this option
	   tolerates invalid signatures	on OCSP	responses it will normally
	   only	be used	for testing purposes.

	   Don't verify	the OCSP response signers certificate at all. Since
	   this	option allows the OCSP response	to be signed by	any
	   certificate it should only be used for testing purposes.

	   Do not use certificates in the response as additional untrusted CA

	   Do not explicitly trust the root CA if it is	set to be trusted for
	   OCSP	signing.

	   Don't perform any additional	checks on the OCSP response signers
	   certificate.	 That is do not	make any checks	to see if the signers
	   certificate is authorised to	provide	the necessary status
	   information:	as a result this option	should only be used for
	   testing purposes.

       -validity_period	nsec, -status_age age
	   These options specify the range of times, in	seconds, which will be
	   tolerated in	an OCSP	response. Each certificate status response
	   includes a notBefore	time and an optional notAfter time. The
	   current time	should fall between these two values, but the interval
	   between the two times may be	only a few seconds. In practice	the
	   OCSP	responder and clients clocks may not be	precisely synchronised
	   and so such a check may fail. To avoid this the -validity_period
	   option can be used to specify an acceptable error range in seconds,
	   the default value is	5 minutes.

	   If the notAfter time	is omitted from	a response then	this means
	   that	new status information is immediately available. In this case
	   the age of the notBefore field is checked to	see it is not older
	   than	age seconds old.  By default this additional check is not

	   This	option sets digest algorithm to	use for	certificate
	   identification in the OCSP request. Any digest supported by the
	   OpenSSL dgst	command	can be used.  The default is SHA-1. This
	   option may be used multiple times to	specify	the digest used	by
	   subsequent certificate identifiers.

   OCSP	Server Options
       -index indexfile
	   The indexfile parameter is the name of a text index file in ca
	   format containing certificate revocation information.

	   If the index	option is specified the	ocsp utility is	in responder
	   mode, otherwise it is in client mode. The request(s)	the responder
	   processes can be either specified on	the command line (using	issuer
	   and serial options),	supplied in a file (using the reqin option) or
	   via external	OCSP clients (if port or url is	specified).

	   If the index	option is present then the CA and rsigner options must
	   also	be present.

       -CA file
	   CA certificate corresponding	to the revocation information in

       -rsigner	file
	   The certificate to sign OCSP	responses with.

       -rother file
	   Additional certificates to include in the OCSP response.

	   Don't include any certificates in the OCSP response.

	   Identify the	signer certificate using the key ID, default is	to use
	   the subject name.

       -rkey file
	   The private key to sign OCSP	responses with:	if not present the
	   file	specified in the rsigner option	is used.

       -rsigopt	nm:v
	   Pass	options	to the signature algorithm when	signing	OCSP
	   responses.  Names and values	of these options are algorithm-

       -port portnum
	   Port	to listen for OCSP requests on.	The port may also be specified
	   using the url option.

	   Ignore malformed requests or	responses: When	acting as an OCSP
	   client, retry if a malformed	response is received. When acting as
	   an OCSP responder, continue running instead of terminating upon
	   receiving a malformed request.

       -nrequest number
	   The OCSP server will	exit after receiving number requests, default

       -nmin minutes, -ndays days
	   Number of minutes or	days when fresh	revocation information is
	   available: used in the nextUpdate field. If neither option is
	   present then	the nextUpdate field is	omitted	meaning	fresh
	   revocation information is immediately available.

OCSP Response verification.
       OCSP Response follows the rules specified in RFC2560.

       Initially the OCSP responder certificate	is located and the signature
       on the OCSP request checked using the responder certificate's public

       Then a normal certificate verify	is performed on	the OCSP responder
       certificate building up a certificate chain in the process. The
       locations of the	trusted	certificates used to build the chain can be
       specified by the	CAfile and CApath options or they will be looked for
       in the standard OpenSSL certificates directory.

       If the initial verify fails then	the OCSP verify	process	halts with an

       Otherwise the issuing CA	certificate in the request is compared to the
       OCSP responder certificate: if there is a match then the	OCSP verify

       Otherwise the OCSP responder certificate's CA is	checked	against	the
       issuing CA certificate in the request. If there is a match and the
       OCSPSigning extended key	usage is present in the	OCSP responder
       certificate then	the OCSP verify	succeeds.

       Otherwise, if -no_explicit is not set the root CA of the	OCSP
       responders CA is	checked	to see if it is	trusted	for OCSP signing. If
       it is the OCSP verify succeeds.

       If none of these	checks is successful then the OCSP verify fails.

       What this effectively means if that if the OCSP responder certificate
       is authorised directly by the CA	it is issuing revocation information
       about (and it is	correctly configured) then verification	will succeed.

       If the OCSP responder is	a "global responder" which can give details
       about multiple CAs and has its own separate certificate chain then its
       root CA can be trusted for OCSP signing.	For example:

	openssl	x509 -in ocspCA.pem -addtrust OCSPSigning -out trustedCA.pem

       Alternatively the responder certificate itself can be explicitly
       trusted with the	-VAfile	option.

       As noted, most of the verify options are	for testing or debugging
       purposes.  Normally only	the -CApath, -CAfile and (if the responder is
       a 'global VA') -VAfile options need to be used.

       The OCSP	server is only useful for test and demonstration purposes: it
       is not really usable as a full OCSP responder. It contains only a very
       simple HTTP request handling and	can only handle	the POST form of OCSP
       queries.	It also	handles	requests serially meaning it cannot respond to
       new requests until it has processed the current one. The	text index
       file format of revocation is also inefficient for large quantities of
       revocation data.

       It is possible to run the ocsp application in responder mode via	a CGI
       script using the	reqin and respout options.

       Create an OCSP request and write	it to a	file:

	openssl	ocsp -issuer issuer.pem	-cert c1.pem -cert c2.pem -reqout req.der

       Send a query to an OCSP responder with URL save
       the response to a file, print it	out in text form, and verify the

	openssl	ocsp -issuer issuer.pem	-cert c1.pem -cert c2.pem \
	    -url -resp_text -respout resp.der

       Read in an OCSP response	and print out text form:

	openssl	ocsp -respin resp.der -text -noverify

       OCSP server on port 8888	using a	standard ca configuration, and a
       separate	responder certificate. All requests and	responses are printed
       to a file.

	openssl	ocsp -index demoCA/index.txt -port 8888	-rsigner rcert.pem -CA demoCA/cacert.pem
	       -text -out log.txt

       As above	but exit after processing one request:

	openssl	ocsp -index demoCA/index.txt -port 8888	-rsigner rcert.pem -CA demoCA/cacert.pem
	    -nrequest 1

       Query status information	using an internally generated request:

	openssl	ocsp -index demoCA/index.txt -rsigner rcert.pem	-CA demoCA/cacert.pem
	    -issuer demoCA/cacert.pem -serial 1

       Query status information	using request read from	a file,	and write the
       response	to a second file.

	openssl	ocsp -index demoCA/index.txt -rsigner rcert.pem	-CA demoCA/cacert.pem
	    -reqin req.der -respout resp.der

       The -no_alt_chains option was added in OpenSSL 1.1.0.

       Copyright 2001-2020 The OpenSSL Project Authors.	All Rights Reserved.

       Licensed	under the OpenSSL license (the "License").  You	may not	use
       this file except	in compliance with the License.	 You can obtain	a copy
       in the file LICENSE in the source distribution or at

1.1.1k				  2021-03-25			       OCSP(1)


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