how to generate barcode in asp.net c# Designing Secure Communications Between Networks in C#.NET

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Designing Secure Communications Between Networks
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When L2TP/IPSec is used to secure VPN traffic, both peers (computers on either side of a communication) must be able to present a certificate that the other peer can validate. Each computer sends to its peer a list of the root CAs that it has machine certificates from. If the peer trusts one of the CAs listed, it should be able to validate the certificate presented by its peer. If it trusts none of them, the con nection cannot be negotiated. When the reader questioned the administrator at Site 3, he found that the site had its own CA hierarchy. He then examined the trusted root CA certificates in the certificate stores of Router1 and Router2 and found, not surprisingly, neither router had a copy of the Site 3 root CA. By sub stituting PPTP for the VPN protocol, the need for certificates was removed. A bet ter solution would have been to develop a trust relationship based on the PKI infrastructure that was present, and that s just what we did next.
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How to Determine Which Certificates Are Necessary
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If you are given the task of determining where trust relationships are needed, the process is simple. To determine which certificates are necessary, complete the following steps:
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Note A fictitious scenario has been included in these steps to illustrate what should be happening.
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1. Make a sketch, or examine one, of the sites and the demand-dial interfaces that will be created between the sites. Figure 7-17 shows such a sketch of three Tailspin Toys sites: New York, San Francisco, and Paris.
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CATS Two VPN Router1 VP2 User database DD_Paris 208.147.66.50 DD_New_York
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DD_San_Francisco
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207.209.68.50 DD_Paris DD_San_Francisco User database DD_New_York
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Internet CATS One VPN tunnel encrypted VPN Router3
VPN Router2 208.147.67.50 DD_Paris DD_New York
User database DD_New_York
Figure 7-17 Connecting Tailspin Toys sites
Lesson 4
Designing Secure Communications with External Organizations
7-47
2. Examine the certificate issued to the proposed VPN router for each site. You can locate this certificate by adding the Certificates snap-in for the local computer to an MMC console and looking in the Personal certificate store. If you look at the Details property page, the Issuer Information provides the name of the CA that issued the cer tificate, and the Certification Path property page displays the root CA in the hierarchy. 3. Make a list (List 1) of VPN routers, their site location, and the names of the root CAs you have discovered for each. Table 7-8 is a list that corresponds to the dia gram in Figure 7-17.
Table 7-8
List 1
Root CA CATSOne CATSOne ParisOne
Router Router1 Router2 Router3
4. Make another list (List 2). Start by listing each VPN router, and then for each VPN router list the sites with which it must have a demand-dial interface. Table 7-9 is the list that corresponds to our example.
Table 7-9
List 2
Site San Francisco
Paris
New York
Paris
New York
San Francisco
Router Router1 Router1 Router2 Router2 Router3 Router3
5. Use the list created in step 3 (List 1) to determine the root CA certificate identified for each site s VPN router. Add the root CA certificate name next to the site names in List 2. Table 7-10 is List 2 with this modification.
Table 7-10
List 2 Modified
Site San Francisco Paris New York Paris New York San Francisco Trusted Root CA for Site CATSOne ParisOne CATSOne ParisOne CATSOne CATSOne
Router Router1 Router1 Router2 Router2 Router3 Router3
7-48
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Designing Secure Communications Between Networks
6. Examine the Root Certification Authorities store for each VPN router. Add the cer tificates that are present to List 2. (See Table 7-11.).
Table 7-11
List 2 Modified
Site San Francisco Paris New York Paris New York San Francisco Trusted Root CA for Site CATSOne ParisOne CATSOne ParisOne CATsOne CATSOne Root Certificates Present CATSOne CATSOne CATSOne CATSOne ParisOne ParisOne
Router Router1 Router1 Router2 Router2 Router3 Router3
7. Examine Table 7-11. Do the routers certificate stores include all the necessary cer tificates Is a copy of the root CA certificate listed as required in List 2 present Place a check mark beside the certificates that are missing from each router s store, as shown in Table 7-12. If a certificate that is necessary is present, the demand-dial interface, if properly configured, will be able to connect. If a certificate is missing, it will not. In this example, Router1 (in the New York site) can accept a certificate from Router2 (in the San Francisco site) because it has a match on its list of trusted CAs. Likewise, Router2 can accept a machine certificate from Router1 because there is a match on its list of trusted CAs. However, Router3 (in the Paris site) does not trust any of the CAs that Router 2 can present. A VPN site-to-site L2TP/IPSec connection cannot be made between Router2 and Router3 or between Router1 and Router3.
Table 7-12
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