User Guide for Cisco Secure Access Control Server - Stewing Home

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Command Authorization Sets 4-28 User Guide for Cisco Secure Access Control Server 4.2 Chapter 4 Shared Profile Components If, for the interface command, the command-authorization set explicitly permits the FastEthernet argument by using the spelling fastethernet, ACS fails the command-authorization request. If the command-authorization rule instead permits the argument FastEthernet, ACS grants the command-authorization request. The case used in command-authorization sets must match what the device sends, which might or might not match the case you use when you type the command. Arguments and Command Authorization About Pattern Matching When you explicitly permit or deny arguments rather than rely on ACS to permit unmatched arguments, you must make certain that you know how devices send arguments to ACS. A device requesting command authorization might send different arguments than what the user typed to issue the command. For example, if during a router-hosted session a user typed the following command: interface FastEthernet0/1 the router might send the following command and arguments ACS: 01:44:53: tty2 AAA/AUTHOR/CMD(390074395): send AV cmd=interface 01:44:53: tty2 AAA/AUTHOR/CMD(390074395): send AV cmd-arg=FastEthernet 01:44:53: tty2 AAA/AUTHOR/CMD(390074395): send AV cmd-arg=0 01:44:53: tty2 AAA/AUTHOR/CMD(390074395): send AV cmd-arg=1 01:44:53: tty2 AAA/AUTHOR/CMD(390074395): send AV cmd-arg= In this example, the router sees multiple arguments where the user typed one string of characters without spaces after the command. It also omits the slash (/) that separated 0 and 1 when the user issued the command. If the command-authorization rule for the interface command explicitly permits the FastEthernet argument to use the spelling FastEthernet0/1, ACS fails the command-authorization request because it does not match what the router submitted to ACS. If the command-authorization rule instead permits the argument FastEthernet 0 1, ACS grants the command-authorization request. The case of arguments specified in command-authorization sets must match what the device sends, which might or might not match the case that you use when you type the arguments. For permit or deny command arguments, ACS applies pattern matching. That is, the argument permit wid matches any argument that contains the string wid. Thus, for example, permit wid would allow not only the argument wid but also the arguments anywid and widget. To limit the extent of pattern matching you can add the following expressions: Dollarsign ($)—Expresses that the argument must end with what has gone before. Thus permit wid$ would match wid or anywid, but not widget. Caret (^)—Expresses that the argument must begin with what follows. Thus permit ^wid would match wid or widget, but not anywid. You can combine these expressions to specify absolute matching. In the example given, you would use permit ^wid$ to ensure that only wid was permitted, and not anywid or widget. To permit or deny commands that carry no arguments, you can use absolute matching to specify the null argument condition. For example, you use permit ^$ to permit a command with no arguments. Alternatively, entering permit has the same effect. You can use either method, with the Permit Unmatched Args option unchecked, to match and permit or deny commands that have no argument. OL-14386-02
Chapter 4 Shared Profile Components Adding a Command Authorization Set OL-14386-02 To add a command-authorization set: Command Authorization Sets Step 1 In the navigation bar, click Shared Profile Components. The Shared Profile Components page lists the command-authorization set types that are available. These always include Shell Command Authorization Sets and may include others, such as command-authorization set types that support Cisco device-management applications. Step 2 Click one of the listed command-authorization set types, as applicable. The selected Command Authorization Sets table appears. Step 3 Click Add. The applicable Command Authorization Set page appears. Depending on the type of command-authorization set that you are adding, the contents of the page vary. Below the Name and Description boxes, ACS displays additional boxes or an expandable checklist tree. The expandable checklist tree appears for device command set types that support a Cisco device-management application. Step 4 In the Name box, type a name for the command-authorization set. Note The set name can contain up to 27 characters. Names cannot contain the following characters: pound sign (#), question mark (?), quotes ("), asterisk (*), right angle bracket (>), left angle bracket (
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