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FIGURE 16-11
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Outlook 2007 Trust Center s E-mail Security page
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local machine To export the certificate, we first have to obtain its thumbprint The following command pipes that value to a txt file, which will appear as shown in Figure 16-12
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>Get-ExchangeCertificate -DomainName e2k7-mb-02virtuecorpcom >>excerttxt
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FIGURE 16-12
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Get-ExchangeCerti cate output to obtain a thumbprint
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The first thumbprint value is what is needed for the subsequent Export-ExchangeCertificate cmdlet syntax shown next The Personal Information Interchange (pfx) file can then be imported to a trusted store Alternatively, when the clients receive the certificate warning, they can view the certificate and install it manually Note the Install Certificate button at the bottom of Figure 16-13
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>Export-ExchangeCertificate -Thumbprint DE498B71B297BDFC51FB342A1DCCA783E19680CD -BinaryEncoded:$true -Path c:\certificates\exportpfx -Password:(Get-Credential) password
Importing the default self-signed certificate into a trusted store for the client allows the use of SSL without acquiring a third-party certificate and eliminates the certificate error they may receive, especially when using a browser accessing OWA over HTTPS This is not optimal because users may need secure access from multiple workstations, thus creating the need to address the certificate error at each unique workstation or logon prompt
Securing Outlook Web Access (OWA)
As mentioned, OWA is secured with an optional self-signed certificate by default This may not be optimal for users on the road accessing OWA on different computers or kiosks For this reason, a trusted third-party-issued certificate or a PKI is a better solution
FIGURE 16-13 Viewing certi cate details
PART V
Part V:
Security
Outlook Web Access can use different authentication types By default, OWA uses Forms-Based Authentication (FBA) and SSL FBA provides the most security It stores the username/password combination in an encrypted cookie This allows Exchange to monitor timeout values for OWA and end the session after a set time is reached Windows Integrated Authentication requires a Windows operating system and Internet Explorer Basic Authentication is supported across all browsers and will likely serve the OWA Light users on Safari on Mac OS X and Firefox on Linux OWA is configured to use SSL by default This is reflected in Internet Information Service (IIS) Manager Navigate to Default Web Site in the IIS Manager and right-click the Default Web Site where the Exchange virtual directories are hosted and select Properties from the context menu Under the Directory Security tab, select the Edit button in the Secure Communications area Figure 16-14 identifies the check box to require SSL for OWA client access Using a valid certificate from a trusted authority will eliminate the certificate error warnings when OWA is accessed Using the properties from the Default Web Site forces the use of SSL for the entire website of virtual directories Alternatively, the same security option is available for each of the virtual directories beneath, should the administrator want to secure them individually
Securing POP3 and IMAP4 with TSL or SSL
If your clients need Post Office Protocol v3 (POP3) or Internet Messaging Access Protocol v4 Rev1 (IMAP4) services through Microsoft Exchange, it is recommended that you secure this communication and authentication SSL is easily implemented to secure client access with
FIGURE 16-14 IIS Manager s Secure Communications dialog box
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Client Access Protocol POP3 IMAP4 TABLE 16-3
Standard Port 110 143
Port with SSL 995 993
Default Client Access Ports Used for POP3 and IMAP4 with and without SSL
these classic protocols, either with the EMC or through the EMS Transport Layer Security (TLS) for POP and IMAP is new to Exchange 2007 By default, accessing POP or IMAP from the client with SSL connects to a different port These ports are outlined in Table 16-3 It is also possible to restrict access to port 110 and 143 and thus force SSL only Assuming you are at least a member of the Local Administrators group and a member of the Exchange Server Administrators group, you can use the EMC and navigate to the Client Access object under Server Configuration From here, select the POP3 and IMAP4 tab Highlight the protocol to secure with SSL and select Properties in the Actions pane The process is the same for POP3 as it is for IMAP4 In the Authentication tab, enter the X509 certificate name, as shown in Figure 16-15, and click Apply In the same tab,
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