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220 Lotus Security Handbook Figure 6-14 Authentication process in Notes and Domino The numbered steps in the diagram are described as follows: 7. The server generates a random number and a session key and encrypts both with Fred's public key. 8. The server sends the encrypted random number to Fred. 9. Fred receives the challenge and decrypts it with his private key. 10.Fred sends back the decrypted number to the server. 11.The server compares Fred's response to the original random number. 12.If the result is the same as the original random number, the server can trust that Fred really is who he claims to be. As with validation, authentication is also a two-way procedure. Fred now authenticates the server using the same challenge/response process, but this time, in reverse. The actual algorithm is complex but efficient. It avoids any RSA operations on subsequent authentications between the same client-server pair. It also establishes a session key that can be used to optimally encrypt the messages that follow authentication.
Switching off certificate-based authentication It is possible to avoid the validation and certification procedure we just described by switching off certificate-based authentication. This basically tells the server to allow anonymous access for users and servers, for which the server does not validate or authenticate them. The downside of doing this should be obvious. A Domino server for which anonymous access is permitted does not record the database activity of the users and servers. (This is normally done in the log file and in the User Activity dialog box.) And, with anonymous access, it is never possible to know who is accessing databases on the server. It is thus not possible to use the user’s identity to control access to databases and design elements. The upside of allowing anonymous access is that it is most useful for providing general public access to servers for users and servers that are not cross-certified with them. It is generally used to allow users and servers outside the organization to access a server without first obtaining a certificate for the organization. All in all, given the advantages and disadvantages of permitting anonymous access to Domino servers, this type of access should only be considered when it is not necessary to know who is accessing the database or when it is not necessary to control access based on client identity. This would thus imply that the information accessible on these databases and servers is of low sensitivity, if not entirely in the public domain. There is more to anonymous access than we can <strong>cover</strong> here. Anonymous access can also be provided for Internet/intranet users, in conjunction with session encryption. We <strong>cover</strong> this later in this chapter, in the Internet PKI section. For now, these are the steps to allow anonymous access to a Domino server for Notes users and other Domino servers: 1. From the Domino Administrator, click the Configuration tab and open the Server document. 2. Click the Security tab. 3. In the Security Settings section, enable “Allow anonymous Notes connections.” 4. Save the document. 5. Create an entry named “Anonymous” in the ACL of all databases to which you want to allow anonymous access. Assign the appropriate access level – typically Reader access. If you don't add “Anonymous” as an entry in the ACL, anonymous users and servers get “Default” access. 6. Stop and restart the server so that the changes take effect. Chapter 6. Public key infrastructures 221
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418 Lotus Security Handbook ► Una
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486 Lotus Security Handbook NextExp
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518 Lotus Security Handbook Control
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520 Lotus Security Handbook “Deny
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11.12.2 Mail policy management New
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Action name Description Change rout
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530 Lotus Security Handbook For inf
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532 Lotus Security Handbook If the
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12.1 Lotus Team Workplace (QuickPla
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538 Lotus Security Handbook Externa
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12.2.2 Proxy support for Sametime c
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546 Lotus Security Handbook ► By
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548 Lotus Security Handbook If the
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12.3 Domino Web Access (iNotes) 12.
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12.3.2 Encrypting a mail file on a
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12.3.5 Protection against malicious
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12.5 IBM WebSphere Portal 12.5.1 Au
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Figure 14-21 Firewall rules 14.3 In
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* Notes SDK include files */ #inclu
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} /*--- * filter termination */ uns
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*/ if (authData->userName && authDa
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goto NoUnlockExit; pLookup = (char
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} } ValueLength -= sizeof(WORD); /*
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* *********************************
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if (getspnam_r(userName, &result, b
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674 L
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Hostname="localhost.dotnsf.com" Por
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Other publications Online resources
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Certificate authorities Domino 260
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kFilterParsedRequest Event 299 kFil
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and iNotes 498 events 492 flowchart
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and WebSphere Portal 622 benefits 2
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Lotus Security Handbook Key securit
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