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Supporting Users with Remote Assistance
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CHapTER 22
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example, the home environment) can solicit help from other users who may also be behind NATs . The private profile includes the appropriate exceptions needed to allow communication with UPnP NAT devices . If a UPnP NAT is in this environment, Remote Assistance will attempt to use the UPnP for NAT traversal . This profile also includes exceptions needed for PNRP . Offer RA via DCOM is not configured in this profile .
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Public profile The Remote Assistance exception is disabled by default and no inbound Remote Assistance traffic is permitted . Windows Firewall is configured this way by default to better protect users in a public networking environment (such as a coffee shop or airport terminal) . When the Remote Assistance exception is enabled, NAT traversal using Teredo is enabled . However, traffic to UPnP devices is not enabled, and Offer RA via DCOM is not enabled . Domain profile The Remote Assistance exception when the computer is in a domain environment is geared toward the Offer RA scenario . This exception is enabled by default in Windows 7 and is typically managed via Group Policy .
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Table 22-2 summarizes the state of the Remote Assistance firewall inbound exception for each type of network location . The Remote Assistance exception has outbound properties as well; however, outbound exceptions are not enabled in Windows Firewall by default .
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TABlE 22-2 Default State of Remote Assistance Firewall Inbound Exception for Each Type of Network
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Location NETWORK lOCATION STATE OF REMOTE ASSISTANCE EXCEPTION DEFAUlT PROPERTIES OF THE REMOTE ASSISTANCE EXCEPTION
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Msra .exe application exception UPnP enabled for communications with UPnP NATs PNRP enabled Edge traversal enabled to support Teredo Msra .exe application exception Edge traversal enabled to support Teredo Msra .exe application exception RAServer .exe (the RA COM server) application exception PNRP enabled DCOM port 135 UPnP enabled for communications with UPnP NATs
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Public
Disabled by default; must be enabled by user with Admin credentials Enabled by default in Windows 7; disabled by default in Windows Vista
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Domain
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Understanding Remote Assistance CHapTER 22
Remote assistance and the Secure Desktop
When a User consents to having a Helper share control of her computer during a Remote Assistance session, the User has the option of allowing the Helper to respond to UAC prompts (Figure 22-1) . Typically, UAC prompts appear on the Secure Desktop (which is not remoted), and consequently the Helper cannot see or respond to Secure Desktop prompts . The Secure Desktop mode is the same mode that a user sees when she logs on to her computer or presses the Secure Attention Sequence (SAS) keystroke (Ctrl+Alt+Delete) . UAC elevation prompts are displayed on the Secure Desktop instead of the user s normal desktop to protect the user from unknowingly allowing malware to run with elevated privileges on her computer . The User must provide consent to a UAC prompt to return to her normal desktop and continue working . This consent requires either clicking Continue (if the user is a local administrator on her computer) or by entering local administrative credentials (if she is a standard user on her computer) .
FIgURE 22-1 The User has the option of allowing the Helper to respond to UAC prompts when the
Remote Assistance session is in the Control Sharing state .
It is important to understand that the Secure Desktop on the User s computer is not remoted to the Helper s computer . In other words, the Helper can respond only to UAC prompts on the User s computer using the User s own credentials . This means that if the User is a standard user on her computer and the Helper is a local administrator on the User s computer, the Helper can have only administrative privileges on the User s computer if the User can first supply those credentials . Enforcing this limitation is essential to ensure the security of Windows 7 desktops . The reason behind this design decision is that, if Remote Assistance was architected to allow the Helper to remotely elevate the User s privileges, the User would be able to terminate the Remote Assistance session and thus steal local administrative credentials from the Helper .
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