doc/man1/openssl-ocsp.pod.in - third_party/openssl - Git at Google

 =pod
 {- OpenSSL::safe::output_do_not_edit_headers(); -}

 =head1 NAME

 openssl-ocsp - Online Certificate Status Protocol command

 =head1 SYNOPSIS

 =head2 OCSP Client

 B<openssl> B<ocsp>
 [B<-help>]
 [B<-out> I<file>]
 [B<-issuer> I<file>]
 [B<-cert> I<file>]
 [B<-no_certs>]
 [B<-serial> I<n>]
 [B<-signer> I<file>]
 [B<-signkey> I<file>]
 [B<-sign_other> I<file>]
 [B<-nonce>]
 [B<-no_nonce>]
 [B<-req_text>]
 [B<-resp_text>]
 [B<-text>]
 [B<-reqout> I<file>]
 [B<-respout> I<file>]
 [B<-reqin> I<file>]
 [B<-respin> I<file>]
 [B<-url> I<URL>]
 [B<-host> I<host>:I<port>]
 [B<-path>]
 [B<-proxy> I<[http[s]://][userinfo@]host[:port][/path]>]
 [B<-no_proxy> I<addresses>]
 [B<-header>]
 [B<-timeout> I<seconds>]
 [B<-VAfile> I<file>]
 [B<-validity_period> I<n>]
 [B<-status_age> I<n>]
 [B<-noverify>]
 [B<-verify_other> I<file>]
 [B<-trust_other>]
 [B<-no_intern>]
 [B<-no_signature_verify>]
 [B<-no_cert_verify>]
 [B<-no_chain>]
 [B<-no_cert_checks>]
 [B<-no_explicit>]
 [B<-port> I<num>]
 [B<-ignore_err>]

 =head2 OCSP Server

 B<openssl> B<ocsp>
 [B<-index> I<file>]
 [B<-CA> I<file>]
 [B<-rsigner> I<file>]
 [B<-rkey> I<file>]
 [B<-passin> I<arg>]
 [B<-rother> I<file>]
 [B<-rsigopt> I<nm>:I<v>]
 [B<-rmd> I<digest>]
 [B<-badsig>]
 [B<-resp_no_certs>]
 [B<-nmin> I<n>]
 [B<-ndays> I<n>]
 [B<-resp_key_id>]
 [B<-nrequest> I<n>]
 [B<-multi> I<process-count>]
 [B<-rcid> I<digest>]
 [B<-I<digest>>]
 {- $OpenSSL::safe::opt_trust_synopsis -}
 {- $OpenSSL::safe::opt_v_synopsis -}
 {- $OpenSSL::safe::opt_provider_synopsis -}

 =head1 DESCRIPTION

 The Online Certificate Status Protocol (OCSP) enables applications to
 determine the (revocation) state of an identified certificate (RFC 2560).

 This 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.

 =head1 OPTIONS

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

 =head2 OCSP Client Options

 =over 4

 =item B<-help>

 Print out a usage message.

 =item B<-out> I<filename>

 specify output filename, default is standard output.

 =item B<-issuer> I<filename>

 This specifies the current issuer certificate.
 This option can be used multiple times.
 This option B<MUST> come before any B<-cert> options.

 =item B<-cert> I<filename>

 Add the certificate I<filename> to the request.
 This option can be used multiple times.
 The issuer certificate is taken from the previous B<-issuer> option,
 or an error occurs if no issuer certificate is specified.

 =item B<-no_certs>

 Don't include any certificates in signed request.

 =item B<-serial> I<num>

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

 =item B<-signer> I<filename>, B<-signkey> I<filename>

 Sign the OCSP request using the certificate specified in the B<-signer>
 option and the private key specified by the B<-signkey> option. If
 the B<-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.

 =item B<-sign_other> I<filename>

 Additional certificates to include in the signed request.
 The input can be in PEM, DER, or PKCS#12 format.

 =item B<-nonce>, B<-no_nonce>

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

 =item B<-req_text>, B<-resp_text>, B<-text>

 Print out the text form of the OCSP request, response or both respectively.

 =item B<-reqout> I<file>, B<-respout> I<file>

 Write out the DER encoded certificate request or response to I<file>.

 =item B<-reqin> I<file>, B<-respin> I<file>

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

 =item B<-url> I<responder_url>

 Specify the responder URL. Both HTTP and HTTPS (SSL/TLS) URLs can be specified.
 The optional userinfo and fragment components are ignored.
 Any given query component is handled as part of the path component.

 =item B<-host> I<hostname>:I<port>, B<-path> I<pathname>

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

 =item B<-proxy> I<[http[s]://][userinfo@]host[:port][/path]>

 The HTTP(S) proxy server to use for reaching the OCSP server unless B<-no_proxy>
 applies, see below.
 The proxy port defaults to 80 or 443 if the scheme is C<https>; apart from that
 the optional C<http://> or C<https://> prefix is ignored,
 as well as any userinfo and path components.
 Defaults to the environment variable C<http_proxy> if set, else C<HTTP_PROXY>
 in case no TLS is used, otherwise C<https_proxy> if set, else C<HTTPS_PROXY>.

 =item B<-no_proxy> I<addresses>

 List of IP addresses and/or DNS names of servers
 not to use an HTTP(S) proxy for, separated by commas and/or whitespace
 (where in the latter case the whole argument must be enclosed in "...").
 Default is from the environment variable C<no_proxy> if set, else C<NO_PROXY>.

 =item B<-header> I<name>=I<value>

 Adds the header I<name> with the specified I<value> to the OCSP request
 that is sent to the responder.
 This may be repeated.

 =item B<-timeout> I<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.

 =item B<-verify_other> I<file>

 File or URI 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 input can be in PEM, DER, or PKCS#12 format.

 =item B<-trust_other>

 The certificates specified by the B<-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.

 =item B<-VAfile> I<file>

 File or URI containing explicitly trusted responder certificates.
 Equivalent to the B<-verify_other> and B<-trust_other> options.
 The input can be in PEM, DER, or PKCS#12 format.

 =item B<-noverify>

 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.

 =item B<-no_intern>

 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 B<-verify_other> or B<-VAfile> options.

 =item B<-no_signature_verify>

 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.

 =item B<-no_cert_verify>

 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.

 =item B<-no_chain>

 Do not use certificates in the response as additional untrusted CA
 certificates.

 =item B<-no_explicit>

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

 =item B<-no_cert_checks>

 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.

 =item B<-validity_period> I<nsec>, B<-status_age> I<age>

 These options specify the range of times, in seconds, which will be tolerated
 in an OCSP response. Each certificate status response includes a B<notBefore>
 time and an optional B<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
 B<-validity_period> option can be used to specify an acceptable error range in
 seconds, the default value is 5 minutes.

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

 =item B<-rcid> I<digest>

 This option sets the digest algorithm to use for certificate identification
 in the OCSP response. Any digest supported by the L<openssl-dgst(1)> command can
 be used. The default is the same digest algorithm used in the request.

 =item B<-I<digest>>

 This option sets digest algorithm to use for certificate identification in the
 OCSP request. Any digest supported by the OpenSSL B<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.

 {- $OpenSSL::safe::opt_trust_item -}

 {- $OpenSSL::safe::opt_v_item -}

 {- $OpenSSL::safe::opt_provider_item -}

 =back

 =head2 OCSP Server Options

 =over 4

 =item B<-index> I<indexfile>

 The I<indexfile> parameter is the name of a text index file in B<ca>
 format containing certificate revocation information.

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

 If the B<-index> option is present then the B<-CA> and B<-rsigner> options
 must also be present.

 =item B<-CA> I<file>

 CA certificate corresponding to the revocation information in the index
 file given with B<-index>.
 The input can be in PEM, DER, or PKCS#12 format.

 =item B<-rsigner> I<file>

 The certificate to sign OCSP responses with.

 =item B<-rkey> I<file>

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

 =item B<-passin> I<arg>

 The private key password source. For more information about the format of I<arg>
 see L<openssl-passphrase-options(1)>.

 =item B<-rother> I<file>

 Additional certificates to include in the OCSP response.
 The input can be in PEM, DER, or PKCS#12 format.

 =item B<-rsigopt> I<nm>:I<v>

 Pass options to the signature algorithm when signing OCSP responses.
 Names and values of these options are algorithm-specific.

 =item B<-rmd> I<digest>

 The digest to use when signing the response.

 =item B<-badsig>

 Corrupt the response signature before writing it; this can be useful
 for testing.

 =item B<-resp_no_certs>

 Don't include any certificates in the OCSP response.

 =item B<-resp_key_id>

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

 =item B<-port> I<portnum>

 Port to listen for OCSP requests on. The port may also be specified
 using the B<url> option.
 A C<0> argument indicates that any available port shall be chosen automatically.

 =item B<-ignore_err>

 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.

 =item B<-nrequest> I<number>

 The OCSP server will exit after receiving I<number> requests, default unlimited.

 =item B<-multi> I<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 B<-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 system-calls).

 =item B<-nmin> I<minutes>, B<-ndays> I<days>

 Number of minutes or days when fresh revocation information is available:
 used in the B<nextUpdate> field. If neither option is present then the
 B<nextUpdate> field is omitted meaning fresh revocation information is
 immediately available.

 =back

 =head1 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 key.

 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 B<-CAfile>,
 B<-CApath> or B<-CAstore> 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
 error.

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

 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 B<-no_explicit> is B<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 B<-VAfile> option.

 =head1 NOTES

 As noted, most of the verify options are for testing or debugging purposes.
 Normally only the B<-CApath>, B<-CAfile>, B<-CAstore> and (if the responder
 is a 'global VA') B<-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 this command in responder mode via a CGI
 script using the B<-reqin> and B<-respout> options.

 =head1 EXAMPLES

 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 http://ocsp.myhost.com/ save the
 response to a file, print it out in text form, and verify the response:

  openssl ocsp -issuer issuer.pem -cert c1.pem -cert c2.pem \
      -url http://ocsp.myhost.com/ -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 B<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

 =head1 HISTORY

 The -no_alt_chains option was added in OpenSSL 1.1.0.

 =head1 COPYRIGHT

 Copyright 2001-2021 The OpenSSL Project Authors. All Rights Reserved.

 Licensed under the Apache License 2.0 (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
 L<https://www.openssl.org/source/license.html>.

 =cut
	=pod
	{- OpenSSL::safe::output_do_not_edit_headers(); -}

	=head1 NAME

	openssl-ocsp - Online Certificate Status Protocol command

	=head1 SYNOPSIS

	=head2 OCSP Client

	B<openssl> B<ocsp>
	[B<-help>]
	[B<-out> I<file>]
	[B<-issuer> I<file>]
	[B<-cert> I<file>]
	[B<-no_certs>]
	[B<-serial> I<n>]
	[B<-signer> I<file>]
	[B<-signkey> I<file>]
	[B<-sign_other> I<file>]
	[B<-nonce>]
	[B<-no_nonce>]
	[B<-req_text>]
	[B<-resp_text>]
	[B<-text>]
	[B<-reqout> I<file>]
	[B<-respout> I<file>]
	[B<-reqin> I<file>]
	[B<-respin> I<file>]
	[B<-url> I<URL>]
	[B<-host> I<host>:I<port>]
	[B<-path>]
	[B<-proxy> I<[http[s]://][userinfo@]host[:port][/path]>]
	[B<-no_proxy> I<addresses>]
	[B<-header>]
	[B<-timeout> I<seconds>]
	[B<-VAfile> I<file>]
	[B<-validity_period> I<n>]
	[B<-status_age> I<n>]
	[B<-noverify>]
	[B<-verify_other> I<file>]
	[B<-trust_other>]
	[B<-no_intern>]
	[B<-no_signature_verify>]
	[B<-no_cert_verify>]
	[B<-no_chain>]
	[B<-no_cert_checks>]
	[B<-no_explicit>]
	[B<-port> I<num>]
	[B<-ignore_err>]

	=head2 OCSP Server

	B<openssl> B<ocsp>
	[B<-index> I<file>]
	[B<-CA> I<file>]
	[B<-rsigner> I<file>]
	[B<-rkey> I<file>]
	[B<-passin> I<arg>]
	[B<-rother> I<file>]
	[B<-rsigopt> I<nm>:I<v>]
	[B<-rmd> I<digest>]
	[B<-badsig>]
	[B<-resp_no_certs>]
	[B<-nmin> I<n>]
	[B<-ndays> I<n>]
	[B<-resp_key_id>]
	[B<-nrequest> I<n>]
	[B<-multi> I<process-count>]
	[B<-rcid> I<digest>]
	[B<-I<digest>>]
	{- $OpenSSL::safe::opt_trust_synopsis -}
	{- $OpenSSL::safe::opt_v_synopsis -}
	{- $OpenSSL::safe::opt_provider_synopsis -}

	=head1 DESCRIPTION

	The Online Certificate Status Protocol (OCSP) enables applications to
	determine the (revocation) state of an identified certificate (RFC 2560).

	This 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.

	=head1 OPTIONS

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

	=head2 OCSP Client Options

	=over 4

	=item B<-help>

	Print out a usage message.

	=item B<-out> I<filename>

	specify output filename, default is standard output.

	=item B<-issuer> I<filename>

	This specifies the current issuer certificate.
	This option can be used multiple times.
	This option B<MUST> come before any B<-cert> options.

	=item B<-cert> I<filename>

	Add the certificate I<filename> to the request.
	This option can be used multiple times.
	The issuer certificate is taken from the previous B<-issuer> option,
	or an error occurs if no issuer certificate is specified.

	=item B<-no_certs>

	Don't include any certificates in signed request.

	=item B<-serial> I<num>

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

	=item B<-signer> I<filename>, B<-signkey> I<filename>

	Sign the OCSP request using the certificate specified in the B<-signer>
	option and the private key specified by the B<-signkey> option. If
	the B<-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.

	=item B<-sign_other> I<filename>

	Additional certificates to include in the signed request.
	The input can be in PEM, DER, or PKCS#12 format.

	=item B<-nonce>, B<-no_nonce>

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

	=item B<-req_text>, B<-resp_text>, B<-text>

	Print out the text form of the OCSP request, response or both respectively.

	=item B<-reqout> I<file>, B<-respout> I<file>

	Write out the DER encoded certificate request or response to I<file>.

	=item B<-reqin> I<file>, B<-respin> I<file>

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

	=item B<-url> I<responder_url>

	Specify the responder URL. Both HTTP and HTTPS (SSL/TLS) URLs can be specified.
	The optional userinfo and fragment components are ignored.
	Any given query component is handled as part of the path component.

	=item B<-host> I<hostname>:I<port>, B<-path> I<pathname>

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

	=item B<-proxy> I<[http[s]://][userinfo@]host[:port][/path]>

	The HTTP(S) proxy server to use for reaching the OCSP server unless B<-no_proxy>
	applies, see below.
	The proxy port defaults to 80 or 443 if the scheme is C<https>; apart from that
	the optional C<http://> or C<https://> prefix is ignored,
	as well as any userinfo and path components.
	Defaults to the environment variable C<http_proxy> if set, else C<HTTP_PROXY>
	in case no TLS is used, otherwise C<https_proxy> if set, else C<HTTPS_PROXY>.

	=item B<-no_proxy> I<addresses>

	List of IP addresses and/or DNS names of servers
	not to use an HTTP(S) proxy for, separated by commas and/or whitespace
	(where in the latter case the whole argument must be enclosed in "...").
	Default is from the environment variable C<no_proxy> if set, else C<NO_PROXY>.

	=item B<-header> I<name>=I<value>

	Adds the header I<name> with the specified I<value> to the OCSP request
	that is sent to the responder.
	This may be repeated.

	=item B<-timeout> I<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.

	=item B<-verify_other> I<file>

	File or URI 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 input can be in PEM, DER, or PKCS#12 format.

	=item B<-trust_other>

	The certificates specified by the B<-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.

	=item B<-VAfile> I<file>

	File or URI containing explicitly trusted responder certificates.
	Equivalent to the B<-verify_other> and B<-trust_other> options.
	The input can be in PEM, DER, or PKCS#12 format.

	=item B<-noverify>

	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.

	=item B<-no_intern>

	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 B<-verify_other> or B<-VAfile> options.

	=item B<-no_signature_verify>

	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.

	=item B<-no_cert_verify>

	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.

	=item B<-no_chain>

	Do not use certificates in the response as additional untrusted CA
	certificates.

	=item B<-no_explicit>

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

	=item B<-no_cert_checks>

	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.

	=item B<-validity_period> I<nsec>, B<-status_age> I<age>

	These options specify the range of times, in seconds, which will be tolerated
	in an OCSP response. Each certificate status response includes a B<notBefore>
	time and an optional B<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
	B<-validity_period> option can be used to specify an acceptable error range in
	seconds, the default value is 5 minutes.

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

	=item B<-rcid> I<digest>

	This option sets the digest algorithm to use for certificate identification
	in the OCSP response. Any digest supported by the L<openssl-dgst(1)> command can
	be used. The default is the same digest algorithm used in the request.

	=item B<-I<digest>>

	This option sets digest algorithm to use for certificate identification in the
	OCSP request. Any digest supported by the OpenSSL B<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.

	{- $OpenSSL::safe::opt_trust_item -}

	{- $OpenSSL::safe::opt_v_item -}

	{- $OpenSSL::safe::opt_provider_item -}

	=back

	=head2 OCSP Server Options

	=over 4

	=item B<-index> I<indexfile>

	The I<indexfile> parameter is the name of a text index file in B<ca>
	format containing certificate revocation information.

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

	If the B<-index> option is present then the B<-CA> and B<-rsigner> options
	must also be present.

	=item B<-CA> I<file>

	CA certificate corresponding to the revocation information in the index
	file given with B<-index>.
	The input can be in PEM, DER, or PKCS#12 format.

	=item B<-rsigner> I<file>

	The certificate to sign OCSP responses with.

	=item B<-rkey> I<file>

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

	=item B<-passin> I<arg>

	The private key password source. For more information about the format of I<arg>
	see L<openssl-passphrase-options(1)>.

	=item B<-rother> I<file>

	Additional certificates to include in the OCSP response.
	The input can be in PEM, DER, or PKCS#12 format.

	=item B<-rsigopt> I<nm>:I<v>

	Pass options to the signature algorithm when signing OCSP responses.
	Names and values of these options are algorithm-specific.

	=item B<-rmd> I<digest>

	The digest to use when signing the response.

	=item B<-badsig>

	Corrupt the response signature before writing it; this can be useful
	for testing.

	=item B<-resp_no_certs>

	Don't include any certificates in the OCSP response.

	=item B<-resp_key_id>

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

	=item B<-port> I<portnum>

	Port to listen for OCSP requests on. The port may also be specified
	using the B<url> option.
	A C<0> argument indicates that any available port shall be chosen automatically.

	=item B<-ignore_err>

	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.

	=item B<-nrequest> I<number>

	The OCSP server will exit after receiving I<number> requests, default unlimited.

	=item B<-multi> I<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 B<-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 system-calls).

	=item B<-nmin> I<minutes>, B<-ndays> I<days>

	Number of minutes or days when fresh revocation information is available:
	used in the B<nextUpdate> field. If neither option is present then the
	B<nextUpdate> field is omitted meaning fresh revocation information is
	immediately available.

	=back

	=head1 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 key.

	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 B<-CAfile>,
	B<-CApath> or B<-CAstore> 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
	error.

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

	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 B<-no_explicit> is B<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 B<-VAfile> option.

	=head1 NOTES

	As noted, most of the verify options are for testing or debugging purposes.
	Normally only the B<-CApath>, B<-CAfile>, B<-CAstore> and (if the responder
	is a 'global VA') B<-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 this command in responder mode via a CGI
	script using the B<-reqin> and B<-respout> options.

	=head1 EXAMPLES

	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 http://ocsp.myhost.com/ save the
	response to a file, print it out in text form, and verify the response:

	openssl ocsp -issuer issuer.pem -cert c1.pem -cert c2.pem \
	-url http://ocsp.myhost.com/ -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 B<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

	=head1 HISTORY

	The -no_alt_chains option was added in OpenSSL 1.1.0.

	=head1 COPYRIGHT

	Copyright 2001-2021 The OpenSSL Project Authors. All Rights Reserved.

	Licensed under the Apache License 2.0 (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
	L<https://www.openssl.org/source/license.html>.

	=cut