PKI: Public Key Infrastructure in .NET

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PKI: Public Key Infrastructure
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peer can allow for multiple trust anchors, one CERTREQ per trust anchor must be generated. The specification forbids sending certificate requests with an empty certificate authority field. The entity receiving a certificate request with X.509 certificate-signature as its certificate type must make sure that the certificate it is sending is acceptable to the requesting peer, i.e. it is not issued by a trust anchor different from the one specified in the CERTREQ. If not, the sending entity must include each certificate in the chain, from the sending entity s certificate to the certificate from the issuer whose name matches the Certificate Authority field within the CERTREQ.
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9.3.2 Identity Management for ISAKMP: No IP Address, Please!
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Regardless of what type of identity is used in the ISAKMP identification payload, this identity is used as a look-up key for both policy and certificate directory look-ups. Inclusion of this payload is mandatory in IKE phase 1 messaging, to the extent that if the identity included in this payload does match an identity on the certificate presented by the peer, the receiving peer must abort the ongoing key exchange. Therefore, great care must be taken in providing trustworthiness for this identity. The ISAKMP specification puts several limitations on the use of the IP address inside its ISAKMP ID payload: first, this IP address must match the source IP address of the peer. Second, this IP address must match exactly one of the identities listed on the certificate presented by the peer. As mentioned earlier, from the PKI management standpoint, this poses a strong requirement for certificate generation: the certificate must be generated after the device has acquired an IP address. For mobile devices with possibly dynamic IP addresses, changing the IP address that was used as certificate subject name would require obtaining a new certificate. Due to obvious difficulties in accommodating the requirements associated with use of an IP address as ISAKMP identification payload, the profiling work recommended against using the IP address for ISAKMP identification payload. The specification, however, mandates that IKE implementations must allow the configuration of local policies requiring the peer source address to appear on the certificate. Several other forms of identities are profiled in the specification, of which the most important ones are FQDN IDs and user-FQDN IDs (RFC 822) to support host-based and user-based access control lists configured in the VPNs supporting hosts and users without fixed IP addresses. Using the identity for policy look-up is a bit more flexible than the case for identity verification and authentication. In cases, when the access control list at the VPN is based on the IP address, the IP address of packets from the peer may be used as policy look-ups as long as a mapping between that IP address and one of the verifiable identities can be made, since the IP address is not very trustworthy. This means even if the IP address is recognized by the VPN gateway and the policy to be applied to the peer s traffic can be determined, the policy is not implemented on the IPsec traffic until the IP address and identity are validated. When FQDN-based identities are used in conjunction with DNS to arrive at IP addresses, care must be taken so that the security of DNS database and its procedures can be guaranteed through DNS security mechanisms [DNSSEC2535]. To accommodate the need for a secure identity, X.509 certificates are allowed to carry multiple forms of identity for the owner. The specification also allows the implementers to pick an identity from those listed on the certificate that is different from the identity included in the ISAKMP ID payload for their policy look-up. This is to accommodate cases where a
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