PKI: Public Key Infrastructure in .NET

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Table 9.5 Certificate Payload Format according to ISAKMP RFC 2408 01234567012345670123456701234567 Next Payload Cert. type reserved Payload length
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Table 9.6 Certificate Request Payload Format according to ISAKMP RFC 2408 01234567012345670123456701234567 Next Payload Cert. type reserved Payload length
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provided or how irrelevant certificates or multiple certificates or certificate payloads without CA information are handled. ISAKMP defines a Hash (HASH) payload is defined to carry a pointer to the certificate. The pointer can then be used to locate the actual certificate.
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9.3.1 Exchange of Certificates within IKE
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9.3.1.1 Certificate Data Type Profiling for ISAKMP As mentioned, ISAKMP allows a peer to request a certificate or certificate-related material from another peer by including a Certificate Request Payload in the key exchange signaling. The second peer responds by including the requested material inside the Certificate Payload. However, part of the profiling work is to specify exactly what certificate-related data types could be used in these payloads. Only the following certificate-related data types (certificate encoding) are now allowed to be used for the ISAKMP Certificate Request Payload and the ISAKMP Certificate Payload. In most cases, one observes that Jon Postel s advice of robust protocol design: Be liberal in what you accept and conservative in what you send is followed very carefully in the use of certificate types in ISAKMP profiling:
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X.509 signature certificates: These are certificates that are used for signing purposes. If an entity receives a CERTREQ that includes this data type but does not support signing certificates, it should ignore the request. The profiling recommends against sending unsolicited certificate data (CERT payloads). In other words, an entity that has not sent any CERTREQ payloads during an exchange, should not expect a CERT payload. The
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profiling work does not consider other types of certificates such as X.509 key exchange certificates. It is allowed to send multiple certificates as long as they are sent in multiple payloads. Certificate revocation lists (CRL): Since ISAKMP limits the maximum size of 64K for CERT payload, many CRLs cannot be transferred within ISAKMP. The profiling work recommends against generating CERTREQ payloads, where the certificate type is certificate revocation list . If a peer receives a CERTREQ that includes a CRL as the certificate type, the peer should ignore the request. Authority revocation lists (ARL): ARLs are basically the same as CRLs, except that they only list CA-certificates that have been revoked. The treatment of this data type is similar to treatment of CRLs. PKCS #7 wrapped X.509 certificate: This type only indicates that the certificate-related material is wrapped inside a PKCS #7. The profiling work recommends against including this type inside a CERTREQ payload. Implementations receiving a CERTREQ including this type may accept the request and treat it as if it were an X.509 signature certificate.
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9.3.1.2 In-Band Versus Out-of-Band Exchanges One of the main goals of the profiling work is to allow the IKE peers to perform an in-band exchange of certificates for authentication purposes. However, the profiling work aims to provide the flexibility of allowing exchange of certificates (using the ISAKMP payload) that are irrelevant to the ongoing IKE authentication. Another feature would be to make the protocol use keying material, obtained from out-of-band methods rather than those that can be obtained from the exchanged certificates. Also despite its main goal, the ISAKMP-PKI profiling work aims to allow the IKE peers to obtain certificates and related materials through out-of-band methods, when efficiency requires it. In such cases, the IKE implementation should be able to ignore CERTREQ payloads, if policy allows. When in-band certificate exchange is desired, the peer must state this desire by sending at least one CERTREQ. As mentioned earlier, a peer that does not send any CERTREQ should not expect to receive any certificates. Also a peer that does not receive any CERTREQ payload should not send any CERT payloads. Again, the be liberal in what you accept philosophy recommends providing the ability to deal with CERTREQ payloads that include unsupported certificate types and gives guidelines on what to do in those cases. The implementations should tolerate reception of duplicate identical CERT payloads or receive irrelevant certificates, but should not send duplicate CERT payloads. Completely irrelevant certificates should be tolerated, since there may be a legitimate reason for them. An example is when the sender wishes to hide its true identity or other important information that is typically sent unencrypted by sending multiple certificates. Another reason for receiving seemingly irrelevant certificates is when several certificate chains follow the trust chain to the same trust anchor CA to the end entity.
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9.3.1.3 Certificate Authority and Certificate Chains The peer requesting a certificate must specify the CA they trust as the trust anchor for the certificates they expect from the sending peer. The requesting peer must populate the Certificate Authority field with the subject name of the trust anchor. If the policy of the requesting
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