SECURE ACCESS TO REMOTE RESOURCES OVER A NETWORK

• US 20160323286A1
• Filed: 07/12/2016
• Published: 11/03/2016
• Est. Priority Date: 12/10/2003
• Status: Active Grant

• Current Assignee: SonicWALL US Holdings, Inc. (SonicWall Holdings Ltd.)
• Original Assignee: Aventail LLC
• Inventors: Sauve, Bryan, Hoover, Paul Lawrence, Erickson, Rodger Del
• Granted Patent: US 10,135,827 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 21/6218 to a system of files or objects, e.g. local or distributed file system or database
• CPC Class Codes: H04L 12/4633 Interconnection of networks using encapsulation techniques, e.g. tunneling
• CPC Class Codes: H04L 12/4675 Dynamic sharing of VLAN information amongst network nodes configuration of the network or of network elements H04L41/08
• CPC Class Codes: H04L 45/021 Ensuring consistency of routing table updates, e.g. by using epoch numbers
• CPC Class Codes: H04L 45/745 Address table lookup; Address filtering
• CPC Class Codes: H04L 61/5046 Resolving address allocation conflicts; Testing of addresses testing when self-assigning an address H04L61/5092
• CPC Class Codes: H04L 63/0227 Filtering policies mail message filtering H04L51/212
• CPC Class Codes: H04L 63/0272 Virtual private networks
• CPC Class Codes: H04L 63/10 for controlling access to devices or network resources
• CPC Class Codes: H04L 67/01 Protocols
• CPC Class Codes: H04L 67/63 Routing a service request depending on the request content or context

Abstract

A client computer hosts a virtual private network tool to establish a virtual private network connection with a remote network. Upon startup, the virtual private network tool collects critical network information for the client computer, and sends this critical network information to an address assignment server in the remote network. The address assignment server compares the critical network information with a pool of available addresses in the remote network, and assigns addresses for use by the client computer that do not conflict with the addresses for local resources. The address assignment server also provides routing information for resources in the remote network to the virtual private network tool. The virtual private network tool will postpone loading this routing information into the routing tables of the client computer until the client computer requests access to a specific resource in the remote network. When the client computer requests access to a specific resource in the remote network, the virtual private network tool will only provide the routing table with the routing information for that specific remote resource.

Claims

1. A method for securely accessing a remote resource on a remote network, the method comprising:

receiving a communication from a server of the remote resource corresponding to an application residing at a client device over a previously established virtual private network connection, the communication identifying network access information corresponding to the remote resource, wherein the network access information identifies at least one of a network address or a name associated with the remote resource;

intercepting the communication at the client device;

examining the network access information included in the communication from the remote resource server;

comparing the network access information included in the communication received from the remote resource server with information stored in a routing table at the client device;

identifying that the network access information included in the communication is not currently included in the routing table; and

adding the network access information to the routing table at the client.

2. The method of claim 1, wherein a virtual private network tool residing at the client device collects information identifying an internet protocol address for one or more network adapters at the client device.

3. The method of claim 2, wherein the virtual private network tool also collects information regarding a subnet for the one or more network adapters at the client device.

4. The method of claim 1, wherein the client device:

the routing table stored includes one or more initial routing rules for accessing a name server in the network, wherein the one or more initial routing rules are limited to one or more routing rules necessary for accessing the remote resource server;

requests access to the remote resource by a client application stored in the memory of the client computing device using the name or the network address of the remote resource;

transmits to the name server an address resolution query for the name of the remote resource based on the one or more initial routing rules;

intercepts a reply from the remote resource server intended for the client application, the reply including a network address corresponding to the name or the network address of the remote resource;

obtains from the memory the routing rule corresponding to the name of the requested resource;

identifies that the client computing device is permitted to access the requested resource based on the routing rule;

generates a routing rule for the network address identified in the reply;

provides to the client application the routing rule for the network address generated from the intercepted reply; and

opens by the client application a secure connection with the remote network based on the routing rule.

5. The method of claim 1, wherein the remote resource server is at least one of is at least one of a Domain Name Server or a Windows Internet Naming Service server.

6. The method of claim 1, wherein the network access information is collected by querying an application program interface (API) at the client device.

7. The method of claim 1, wherein a virtual address is assigned by the remote access server that the client device may use when accessing the remote resource.

8. The method of claim 7, wherein the assigned virtual address does not conflict with network addresses local to the client device.

9. A non-transitory computer readable storage medium having embodied thereon a program executable by a processor for implementing a method for securely accessing a remote resource on a remote network, the method comprising:

receiving a communication from a server of the remote resource corresponding to an application residing at a client device over a previously established virtual private network connection, the communication identifying network access information corresponding to the remote resource, wherein the network access information identifies at least one of a network address or a name associated with the remote resource;

intercepting the communication at the client device;

examining the network access information included in the communication from the remote resource server;

comparing the network access information included in the communication received from the remote resource server with information stored in a routing table at the client device;

identifying that the network access information included in the communication is not currently included in the routing table; and

adding the network access information to the routing table at the client.

10. The non-transitory computer readable storage medium of claim 9, wherein a virtual private network tool residing at the client device collects information identifying an internet protocol address for one or more network adapters at the client device.

11. The non-transitory computer readable storage medium of claim 10, wherein the virtual private network tool also collects information regarding a subnet for the one or more network adapters at the client device.

12. The non-transitory computer readable storage medium of claim 9, wherein the client device:

the routing table stored includes one or more initial routing rules for accessing a name server in the network, wherein the one or more initial routing rules are limited to one or more routing rules necessary for accessing the remote resource server;

requests access to the remote resource by a client application stored in the memory of the client computing device using the name or the network address of the remote resource;

transmits to the name server an address resolution query for the name of the remote resource based on the one or more initial routing rules;

intercepts a reply from the remote resource server intended for the client application, the reply including a network address corresponding to the name or the network address of the remote resource;

obtains from the memory the routing rule corresponding to the name of the requested resource;

identifies that the client computing device is permitted to access the requested resource based on the routing rule;

generates a routing rule for the network address identified in the reply;

provides to the client application the routing rule for the network address generated from the intercepted reply; and

opens by the client application a secure connection with the remote network based on the routing rule.

13. The non-transitory computer readable storage medium of claim 9, wherein the remote resource server is at least one of is at least one of a Domain Name Server or a Windows Internet Naming Service server.

14. The non-transitory computer readable storage medium of claim 9, wherein the network access information is collected by querying an application program interface (API) at the client device.

15. The non-transitory computer readable storage medium of claim 9, wherein a virtual address is assigned by the remote access server that the client device may use when accessing the remote resource.

16. The non-transitory computer readable storage medium of claim 15, wherein the assigned virtual address does not conflict with network addresses local to the client device.

17. An apparatus for securely accessing a remote resource on a remote network, the apparatus comprising:

a network interface that receives communication from a server of the remote resource corresponding to an application residing at a client device over a previously established virtual private network connection, the communication identifying network access information corresponding to the remote resource, wherein the network access information identifies at least one of a network address or a name associated with the remote resource;

a memory; and

a processor, wherein the processor executing instructions out of the memory;

intercepts the communication;

examines the network access information included in the communication from the remote resource server;

compares the network access information included in the communication received from the remote resource server with information stored in a routing table stored in the memory;

identifies that the network access information included in the communication is not currently included in the routing table; and

adds the network access information to the routing table at the client.

18. The apparatus of claim 17, wherein a virtual private network tool residing at the client device collects information identifying an internet protocol address for one or more network.

19. The apparatus of claim 18, wherein the virtual private network tool also collects information regarding a subnet for the one or more network adapters.

20. The apparatus of claim 18, wherein the remote resource server is at least one of is at least one of a Domain Name Server or a Windows Internet Naming Service server.