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Both of these protocols have no security of their own and are, therefore, a security risk As I mentioned earlier in the chapter, packet-sniffing a POP3 session will quickly yield a user name and password for the user being monitored (the same applies to an IMAP4 session) I m treating these two as one, as the configuration of each is identical Securing the Session Exchange 2007 supports securing POP3/IMAP via SSL/TLS Using Exchange s self-signed SSL certificate that ships with the product, the only configuration you need to do is modify (if desired) the ports used for SSL using the Exchange Management Console, if you have Exchange 2007 Service Pack 1 (SP1) installed (shown in Figure 12-9) If you re not running SP1, use the Set-PopSettings and Set-ImapSettings cmdlets within the Exchange Management Shell Securing the Authentication Again, if you have SP1 installed, you can modify the authentication settings from the Exchange Management Console, shown in Figure 12-10 (if you re not running SP1, you ll need to use the Set-PopSettings and Set-ImapSettings cmdlets)
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Microsoft Exchange Server 2007: A Beginner s Guide
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Figure 12-9 Modify the SSL ports in the Exchange Management Console
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Table 12-2 lists the values and their implications on the use of SSL/TLS with POP3 and IMAP4
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While there is no need to configure how the Client Access role interacts with other roles, I think it is important for you to be aware of the various ports and authentication methods used Table 12-3 lists the roles, ports, supported authentication, and encryption methods when the Client Access role communicates with other servers
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Securing the Hub Transport and Edge Transport Server Roles
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There are a few different aspects of security that apply to the Transport roles The first issue that should come to mind when considering the security of the Transport roles is the fact that one of your transport servers (whether Hub or Edge) may be (depending on your configuration) directly exposed to the Internet In addition, there is communication between a Hub Transport server and other server roles that needs to be secured
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12:
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Securing Exchange 2007
Figure 12-10 Modifying the authentication settings from the Exchange Management Console
Internet Exposure
If you re not using an ISA server, at least one of your Transport servers will be receiving e-mail from the Internet This can mean the server is exposed, but there are several simple and secure workarounds: Use an SMTP proxy, keeping the Transport server protected from external exposure Publish SMTP services via an ISA server (this is your most secure option, as the ISA server adds its own layer of security) If you only have the Hub Transport role to receive e-mail from the Internet, configure your firewall to only allow access to the needed ports (more on this later)
Securing Connectors
The send and receive connectors used by the Transport servers are secured using TLS and authentication, as shown in Figure 12-11 Depending on the connector, the TLS may or may not be enabled (see Table 12-3 at the end of this section for specifics on when TLS is enabled) Microsoft automatically takes care of the security for default send and receive connectors, but should you need to create your own (more on this in 6), ensure that TLS is used to maintain security of your messages as they traverse your network
Microsoft Exchange Server 2007: A Beginner s Guide
Authentication Value Plain Text Login
Description TLS is not required Credentials will be sent unencrypted unless TLS or SSL is implemented It will be up to the client to specify secured POP3 or IMAP4 ports (995 for POP3 with SSL and 993 for IMAP4 with SSL)
Plain Text TLS is not required on standard POP3 and IMAP4 ports Authentication Login (110 for POP3 and 143 for IMAP4) However, basic authentication is only allowed on a port secured by TLS or SSL Secure Login Standard POP3 and IMAP 4 ports must be secured with TLS before authentication is allowed
Table 12-2 POP3/IMAP4 Authentication Settings
Server Role Mailbox (2007) Mailbox (earlier versions)
Ports
Authentication
Encryption RPC Encryption (enabled by default) None by default, but can use IPSec
RPC (uses many Kerberos (default) ports) NTLM TCP 80, TCP 443 Kerberos (default) (SSL) NTLM (default fallback) Basic (optional) TCP 5060, TCP 5061, TCP 5062, dynamic ports IP address only
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