OPT_SECTION("Server authentication"),
{"trusted", OPT_TRUSTED, 's',
- "Trusted certs used for CMP server authentication when verifying responses"},
+ "Certificates to trust as chain roots when verifying signed CMP responses"},
{OPT_MORE_STR, 0, 0, "unless -srvcert is given"},
{"untrusted", OPT_UNTRUSTED, 's',
"Intermediate certs for chain construction verifying CMP/TLS/enrolled certs"},
{"srvcert", OPT_SRVCERT, 's',
- "Specific CMP server cert to use and trust directly when verifying responses"},
+ "Server cert to pin and trust directly when verifying signed CMP responses"},
{"recipient", OPT_RECIPIENT, 's',
- "Distinguished Name (DN) of the recipient to use unless -srvcert is given"},
+ "Distinguished Name (DN) to use as msg recipient; see man page for defaults"},
{"expect_sender", OPT_EXPECT_SENDER, 's',
- "DN of expected response sender. Defaults to DN of -srvcert, if provided"},
+ "DN of expected sender of responses. Defaults to subject of -srvcert, if any"},
{"ignore_keyusage", OPT_IGNORE_KEYUSAGE, '-',
"Ignore CMP signer cert key usage, else 'digitalSignature' must be allowed"},
{"unprotected_errors", OPT_UNPROTECTED_ERRORS, '-',
The argument must be formatted as I</type0=value0/type1=value1/type2=...>,
characters may be escaped by C<\>E<nbsp>(backslash), no spaces are skipped.
-In case B<-cert> is not set, for instance when using MSG_MAC_ALG,
-the subject DN is also used as sender of the PKI message.
+The subject DN is also used as fallback sender of outgoing CMP messages
+if no B<-cert> and no B<-oldcert> are given.
=item B<-issuer> I<name>
When verifying signature-based protection of CMP response messages,
these are the CA certificate(s) to trust while checking certificate chains
during CMP server authentication.
-This option gives more flexibility than the B<-srvcert> option because
-it does not pin down the expected CMP server by allowing only one certificate.
+This option gives more flexibility than the B<-srvcert> option because the
+protection certificate is not pinned but may be any certificate
+for which a chain to one of the given trusted certificates can be constructed.
Multiple filenames may be given, separated by commas and/or whitespace
(where in the latter case the whole argument must be enclosed in "...").
=item B<-srvcert> I<filename>
-The specific CMP server certificate to use and directly trust (even if it is
+The specific CMP server certificate to expect and directly trust (even if it is
expired) when verifying signature-based protection of CMP response messages.
-May be set alternatively to the B<-trusted> option
-if the certificate is available and only this one shall be accepted.
+May be set alternatively to the B<-trusted> option to pin the accepted server.
-If set, the issuer of the certificate is also used as the recipient of the CMP
-request and as the expected sender of the CMP response,
-overriding any potential B<-recipient> option.
+If set, the subject of the certificate is also used
+as default value for the recipient of CMP requests
+and as default value for the expected sender of CMP responses.
=item B<-recipient> I<name>
-This option may be used to explicitly set the Distinguished Name (DN)
-of the CMP message recipient, i.e., the CMP server (usually a CA or RA entity).
+Distinguished Name (DN) to use in the recipient field of CMP request messages,
+i.e., the CMP server (usually a CA or RA entity).
The argument must be formatted as I</type0=value0/type1=value1/type2=...>,
characters may be escaped by C<\>E<nbsp>(backslash), no spaces are skipped.
-If a CMP server certificate is given with the B<-srvcert> option, its subject
-name is taken as the recipient name and the B<-recipient> option is ignored.
-If neither of the two are given, the recipient of the PKI message is
-determined in the following order: from the B<-issuer> option if present,
-the issuer of old cert given with the B<-oldcert> option if present,
-the issuer of the client certificate (B<-cert> option) if present.
-
-The recipient field in the header of CMP messagese is mandatory.
-If none of the options that enable the derivation of the recipient name are
-given, no suitable value for the recipient in the PKIHeader is available.
-As a last resort it is set to NULL-DN.
-
-When a response is received, its sender must match the recipient of the request.
+The recipient field in the header of a CMP message is mandatory.
+If not given explicitly the recipient is determined in the following order:
+the subject of the CMP server certificate given with the B<-srvcert> option,
+the B<-issuer> option,
+the issuer of the certificate given with the B<-oldcert> option,
+the issuer of the CMP client certificate (B<-cert> option),
+as far as any of those is present, else the NULL-DN as last resort.
=item B<-expect_sender> I<name>
-Distinguished Name (DN) of the expected sender of CMP response messages when
-MSG_SIG_ALG is used for protection.
-This can be used to ensure that only a particular entity is accepted
-as the CMP server, and attackers are not able to use arbitrary certificates
-of a trusted PKI hierarchy to fraudulently pose as a CMP server.
-Note that this option gives slightly more freedom than B<-srvcert>,
-which pins down the server to a particular certificate,
-while B<-expect_sender> I<name> will continue to match after updates of the
-server cert.
+Distinguished Name (DN)
+expected in the sender field of signature-protected response messages.
+Defaults to the subject DN of the pinned B<-srvcert>, if any.
The argument must be formatted as I</type0=value0/type1=value1/type2=...>,
characters may be escaped by C<\>E<nbsp>(backslash), no spaces are skipped.
-If not given, the subject DN of B<-srvcert>, if provided, will be used.
+This can be used to make sure that only a particular entity is accepted as
+CMP message signer, and attackers are not able to use arbitrary certificates
+of a trusted PKI hierarchy to fraudulently pose as a CMP server.
+Note that this option gives slightly more freedom than setting the B<-srvcert>,
+which pins the server to the holder of a particular certificate, while the
+expected sender name will continue to match after updates of the server cert.
=item B<-ignore_keyusage>
to a structure containing arguments, previously set by
OSSL_CMP_CTX_set_transfer_cb_arg() or NULL if unset.
-OSSL_CMP_CTX_set1_srvCert() pins the given server certificate B<srvCert>
-directly trusts it (even if it is expired) for verifying response messages.
+OSSL_CMP_CTX_set1_srvCert() sets the expected server cert B<srvCert> and trusts
+it directly (even if it is expired) when verifying signed response messages.
+May be used alternatively to OSSL_CMP_CTX_set0_trustedStore()
+to pin the accepted server.
+Any previously set value is freed.
The B<cert> argument may be NULL to clear the entry.
-
-OSSL_CMP_CTX_set1_expected_sender() sets the Distinguished Name (DN) expected to
-be given in the sender response for messages protected with MSG_SIG_ALG. This
-may be used to enforce that during validation of received messages the given DN
-matches the sender field of the PKIMessage header, which in turn is used to
-identify the server certificate.
-This can be used to ensure that only a particular entity is accepted to act as
-CMP server, and attackers are not able to use arbitrary certificates of a
-trusted PKI hierarchy to fraudulently pose as server.
-This defaults to the subject of the B<srvCert>, if any.
-
-OSSL_CMP_CTX_set0_trustedStore() sets the X509_STORE type certificate store
-containing trusted (root) CA certificates. The certificate store may also hold
-CRLs and a certificate verification callback function used for CMP server
-authentication. Any already existing store entry is freed. When given a NULL
-parameter the entry is cleared.
-
-OSSL_CMP_CTX_get0_trustedStore() returns a pointer to the certificate store
-containing trusted root CA certificates, which may be empty if unset.
+If set, the subject of the certificate is also used
+as default value for the recipient of CMP requests
+and as default value for the expected sender of CMP responses.
+
+OSSL_CMP_CTX_set1_expected_sender() sets the Distinguished Name (DN)
+expected in the sender field of signature-protected response messages.
+Defaults to the subject of the pinned server certificate B<-srvcert>, if any.
+This can be used to make sure that only a particular entity is accepted as
+CMP message signer, and attackers are not able to use arbitrary certificates
+of a trusted PKI hierarchy to fraudulently pose as CMP server.
+Note that this gives slightly more freedom than OSSL_CMP_CTX_set1_srvCert(),
+which pins the server to the holder of a particular certificate, while the
+expected sender name will continue to match after updates of the server cert.
+
+OSSL_CMP_CTX_set0_trustedStore() sets the certificate store of type X509_STORE
+containing trusted (root) CA certificates.
+The store may also hold CRLs and
+a certificate verification callback function used for CMP server authentication.
+Any store entry already set before is freed.
+When given a NULL parameter the entry is cleared.
+
+OSSL_CMP_CTX_get0_trustedStore() returns a pointer to the currently set
+certificate store containing trusted cert etc., or an empty store if unset.
OSSL_CMP_CTX_set1_untrusted_certs() sets up a list of non-trusted certificates
of intermediate CAs that may be useful for path construction when authenticating
The B<cert> argument may be NULL to clear the entry.
OSSL_CMP_CTX_set1_pkey() sets the private key corresponding to the
-protecting certificate B<cert> set via B<OSSL_CMP_CTX_set1_cert()>.
+protection certificate B<cert> set via B<OSSL_CMP_CTX_set1_cert()>.
This key is used create signature-based protection (protectionAlg = MSG_SIG_ALG)
of outgoing messages
unless a PBM secret has been set via B<OSSL_CMP_CTX_set1_secretValue()>.
OSSL_CMP_CTX_set1_referenceValue() sets the given referenceValue B<ref> with
length B<len> in the given B<ctx> or clears it if the B<ref> argument is NULL.
According to RFC 4210 section 5.1.1, if no value for the "sender" field in
-CMP message headers can be determined (i.e., no protecting certificate B<cert>
+CMP message headers can be determined (i.e., no protection certificate B<cert>
and no B<subjectName> is given) then the "sender" field will contain the NULL-DN
and the senderKID field of the CMP message header must be set.
When signature-based protection is used the senderKID will be set to
-the subjectKeyIdentifier of the protecting B<cert> as far as present.
+the subjectKeyIdentifier of the protection B<cert> as far as present.
If not present or when PBM-based protection is used
the B<ref> value is taken as the fallback value for the senderKID.
OSSL_CMP_CTX_set1_recipient() sets the recipient name that will be used in the
-PKIHeader of a request message, i.e. the X509 name of the (CA) server.
-Setting is overruled by subject of B<srvCert> if set.
-If neither B<srvCert> nor recipient are set, the recipient of the PKI message is
-determined in the following order: issuer, issuer of old cert (oldCert),
-issuer of protecting certificate (B<cert>), else NULL-DN.
-When a response is received, its sender must match the recipient of the request.
+PKIHeader of CMP request messages, i.e. the X509 name of the (CA) server.
+
+The recipient field in the header of a CMP message is mandatory.
+If not given explicitly the recipient is determined in the following order:
+the subject of the CMP server certificate set using OSSL_CMP_CTX_set1_srvCert(),
+the value set using OSSL_CMP_CTX_set1_issuer(),
+the issuer of the certificate set using OSSL_CMP_CTX_set1_oldCert(),
+the issuer of the protection certificate (B<cert>),
+as far as any of those is present, else the NULL-DN as last resort.
OSSL_CMP_CTX_push0_geninfo_ITAV() adds B<itav> to the stack in the B<ctx> to be
added to the GeneralInfo field of the CMP PKIMessage header of a request
OSSL_CMP_CTX_set1_oldCert() sets the old certificate to be updated in
Key Update Requests (KUR) or to be revoked in Revocation Requests (RR).
-It must be given for RR, else it defaults to the protecting B<cert>.
+It must be given for RR, else it defaults to the protection B<cert>.
The B<reference certificate> determined in this way, if any, is also used for
deriving default subject DN and Subject Alternative Names for IR, CR, and KUR.
Its issuer, if any, is used as default recipient in the CMP message header.
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