PKI: Public Key Infrastructure in .NET

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whole process of key pair generation, certificate request creation and submission using the web pages. Hence the need for authentication support over the web was created. Secure socket layer (SSL) provides the means of server to client authentication as well as the establishment of a secure channel and shared key between the client and server. Once the server authenticates to the client using the server s own certificate and a secure channel is established, the SSL-based secure channel can be used to keep client s PKCS #10-based certificate request confidential and immune from tampering. There are several problems with the PKCS #10 and SSL combination:
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The SSL channel is established based on authentication of the server to the client. SSL does not provide native support for client to server authentication. Some implementations use SSL secure channel to pass client authentication credentials such as password and so on to the server. But this again means the certificate-requesting client must have been configured with proper authentication credentials to perform this authentication. It has also been stated that since SSL only provides stream protection and not individual packet integrity protection, it cannot be safely used as a basis for authentication to CA. Once SSL authentication is successfully performed, the CA has no knowledge of what identity has been used for this authentication and cannot safely say what identity can be put on the certificate. Adding SSL protection for the PKCS #10 does not solve the problem that there is still no specification for responses to certificate requests or for the certificate revocation process.
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The way many implementations deal with these problems is that the certificate that is issued on behalf of the client is not delivered until the client authenticates itself to the PKI through some other non-web-based (not through SSL) means. Examples are either use of an out-of-bound method or use of three-party models that deploy RAs. An example of out-of-bound method authentication is explained earlier: sending an authenticator value to the client through email and expecting a specific email response from the client. Three-party models can be implemented in different ways:
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One example is instead of having the client establish the SSL connection to the CA, have the client present authentication material to RA, which in turn establishes an SSL connection to the CA to protect the certificate requests that travel between RA and CA. The CA sends the certificate to RA, which delivers it to the client. The other example is to have the client send the certificate request to the CA. But the CA does not process the request right away. Instead the CA forwards the certificate request to RA to handle the authentication process. Once the RA is satisfied with the client s authentication credentials, the RA sends a go-ahead response on certificate generation from the CA.
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9.1.5.3 PKCS #7 Protection for PKCS #10 Cryptographic message syntax (CMS) was first standardized by RSA as PKCS #7 and then by IETF as RFC 2315 [PKCS2315]. PKCS #7 is a commonly used standard used for security protection of many protocols such as S/MIME and therefore its messaging is designed to carry data from other protocols, such as PKCS #10 certificate requests. The data from other protocols is carried either natively or with added cryptographic enhancements, such as
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signatures, encryptions, and so on. The message format for PKCS #7 is very simple: It consists of two fields:
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Content: This is the payload, or the data from other protocols, using PKCS #7 as an encapsulation mechanism. Content type: This field describes the type of the payload. PKCS #7 defines 6 content types: data, signedData, encryptedData and some other types that we don t mention here, since our interest is in defining the usage of PKCS #7 for PKIs.
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RFC 2315 defines two classes of content types: base and enhanced. Content types in the base class contain just data, with no cryptographic enhancements, while content types in the enhanced class contain a content of some type plus cryptographic enhancements such as signatures. Enhanced content types are typically encapsulated in the PKCS #7 format. Therefore, the content being enhanced (from other protocols) is called inner content, while the content that includes the cryptographic enhancements is called outer content. An example will clarify this shortly. Many PKI deployments use PKCS #7 signedData format for signing PKCS #10 certificate requests (inner content in this case). The format for the completed format, i.e. a PKCS #10 certificate request encapsulated as signedData inside a PKCS #7 packet is shown in Table 9.3. Either the end client or the RA can do the signing, using their own private keys. However, the end client must already hold a current certificate with corresponding signature key to be able to sign. This means the end client cannot be the signer for initial certificate requests. PKCS #7 also allows multiple signers to sign the signedData content in parallel or in series. However, Table 9.3 does not show a case where multiple signers sign each other s signed contents (in a serial fashion). Here is how PKCS #7 used for protection of PKCS #10 requests:
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A PKCS #10 certificate request is generated, signed (by a client of an RA) and is inserted in the content portion of the PKCS #7 signedData as shown in Table 9.3. To add more clarity, the PKCS #10 request is shaded with gray color. Note that more information needs to be added to build the PKCS #7 content, since signedData includes many other fields as described below. The so-called signer, i.e. the entity that signs the data and vouches for it, signs the PKCS #10 request with a digest algorithm. Note that this signature is different from the signature included in the PKCS #10 request itself. The signature in PKCS #10 must be performed with the private key of the key pair for which the certificate is being requested for, while the signature included by the signer is done by the signer s own private key. Even when the certificate request was originally generated and signed by the client itself, the signer here can be an RA vouching for the client (after authentication has taken place, of course). Other optional data such as certificates and CRLs may also be added to data before running the digest algorithm, so that they can be protected as well. In Table 9.3, we show this by adding brackets around these fields. The signer also fills other fields that are required for signedData content format. These fields are version, a list of algorithms used for creating the digest. If optional certificates and CRLs were added to the data, a list of these certificates and CRLs is also added to the content. The signature (digest) itself is added to a field called signerInfo as explained below. To allow for the messages to be signed by multiple authorities or so-called signers, a specific field called signerInfo is added to the content. For simplicity, Table 9.3 shows a
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