Cryptographic peer discovery, authentication, and authorization for on-path signaling

• US 8,122,482 B2
• Filed: 01/24/2008
• Issued: 02/21/2012
• Est. Priority Date: 01/24/2008
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: McGrew, David A., Shore, Melinda L.
• Primary Examiner(s): Zand, Kambiz
• Assistant Examiner(s): Hailu, Teshome
• Application Number:
  US12/019,541
• Publication Number:
  US 20090193506A1
• Time in Patent Office: 1,489 Days
• Field of Search: 726/1, 713/153
• US Class Current: 726/1
• CPC Class Codes: H04L 63/0263 Rule management
• CPC Class Codes: H04L 63/029 Firewall traversal, e.g. tunnelling or, creating pinholes
• CPC Class Codes: H04L 63/0807 using tickets, e.g. Kerberos cryptographic mechanisms or cryptographic arrangements for entity authentication using tickets or tokens H04L9/3213

Abstract

A method is disclosed for cryptographic peer discovery, authentication, and authorization. According to one embodiment, a data packet, which is addressed to a destination device other than an intermediary network device, is intercepted at the intermediary network device. The data packet contains a request and a group identifier. A shared secret cryptographic key, which is mapped to the group identifier, is selected. A challenge is sent toward an upstream device from whence the data packet came. A response is received. A verification value is generated based on the cryptographic key and the challenge. It is determined whether the response matches the verification value. If the response matches the verification value, then it is determined whether the request is allowed by an authorization set that is mapped to the group identifier. If the request is allowed, then a policy of the intermediary network device is configured based on the request.

Claims

1. A method for secure network device policy configuration, the method comprising the computer-implemented steps of:

storing a mapping between a group identifier and a particular cryptographic key, wherein the group identifier identifies a group of three or more network devices;

intercepting, at an intermediary network device, one or more data packets that (a) are addressed to a destination device other than the intermediary network device, (b) collectively contain a request, and (c) collectively contain the group identifier;

selecting, from among one or more cryptographic keys that are stored at the intermediary network device, the particular cryptographic key that is mapped to the group identifier;

determining whether a mutual authentication process is successful between the intermediary network device and an upstream device that sent the one or more data packets toward to the intermediary network device; and

in response to determining that the mutual authentication process is successful between the intermediary network device and the upstream device, configuring, based on the request, a policy of the intermediary network device.

2. A method as recited in claim 1, wherein the one or more data packets do not contain the particular cryptographic key.

3. A method as recited in claim 1, wherein the particular steps further comprise sending the one or more data packets toward the destination device.

4. A method as recited in claim 1, wherein configuring the policy of the intermediary network device comprises configuring a firewall to allow forwarding of each data flow that satisfies criteria that are specified in the request.

5. A method as recited in claim 1, wherein configuring the policy of the intermediary network device comprises configuring the intermediary network device to provide, to each data flow that satisfies criteria that are specified in the request, a quality of service that is at least as high as a quality of service that is specified in the request.

6. An apparatus for secure network device policy configuration, comprising:

means for storing a mapping between a group identifier and a particular cryptographic key, wherein the group identifier identifies a group of three or more network devices;

means for intercepting, at an intermediary network device, one or more data packets that (a) are addressed to a destination device other than the intermediary network device, (b) collectively contain a request, and (c) collectively contain the group identifier;

means for selecting, from among one or more cryptographic keys that are stored at the intermediary network device, the particular cryptographic key that is mapped to the group identifier;

means for determining whether a mutual authentication process is successful between the intermediary network device and an upstream device that sent the one or more data packets toward to the intermediary network device; and

means for configuring, in response to determining that the mutual authentication process is successful between the intermediary network device and the upstream device, based on the request, a policy of the intermediary network device.

7. An apparatus as recited in claim 6, wherein the one or more data packets do not contain the particular cryptographic key.

8. An apparatus as recited in claim 6, further comprising means for sending the one or more data packets toward the destination device.

9. An apparatus as recited in claim 6, wherein the means for configuring the policy of the intermediary network device comprise means for configuring a firewall to allow forwarding of each data flow that satisfies criteria that are specified in the request.

10. An apparatus as recited in claim 6, wherein the means for configuring the policy of the intermediary network device comprise means for configuring the intermediary network device to provide, to each data flow that satisfies criteria that are specified in the request, a quality of service that is at least as high as a quality of service that is specified in the request.

11. An apparatus for secure network device policy configuration, comprising:

a network interface that is coupled to a data network for receiving one or more packet flows therefrom;

a processor;

one or more stored sequences of instructions which, when executed by the processor, cause the processor to carry out the steps of;

storing a mapping between a group identifier and a particular cryptographic key, wherein the group identifier identifies a group of three or more network devices;

intercepting, at an intermediary network device, one or more data packets that (a) are addressed to a destination device other than the intermediary network device, (b) collectively contain a request, and (c) collectively contain the group identifier;

selecting, from among one or more cryptographic keys that are stored at the intermediary network device, the particular cryptographic key that is mapped to the group identifier;

determining whether a mutual authentication process is successful between the intermediary network device and an upstream device that sent the one or more data packets toward to the intermediary network device; and

in response to determining that the mutual authentication process is successful between the intermediary network device and the upstream device, configuring, based on the request, a policy of the intermediary network device.

12. An apparatus as recited in claim 11, wherein the one or more data packets do not contain the particular cryptographic key.

13. An apparatus as recited in claim 11, wherein the one or more sequences of instructions further comprise instructions which, when executed by the processor, cause the processor to carry out the steps of sending the one or more data packets toward the destination device.

14. An apparatus as recited in claim 11, wherein configuring the policy of the intermediary network device comprises configuring a firewall to allow forwarding of each data flow that satisfies criteria that are specified in the request.

15. An apparatus as recited in claim 11, wherein configuring the policy of the intermediary network device comprises configuring the intermediary network device to provide, to each data flow that satisfies criteria that are specified in the request, a quality of service that is at least as high as a quality of service that is specified in the request.