Systems and methods for monitoring virtual networks

1. A computer-implemented method for monitoring virtual networks, at least a portion of the method being performed by a computing device comprising at least one processor, the method comprising:

identifying, within a cloud-computing environment that hosts a plurality of virtual networks, a virtual network comprising at least one virtualized edge switching device that handles, using a software-defined network protocol, all packets passed between the virtual network and at least one additional virtual network within the cloud-computing environment;

emulating a physical wiretap within the virtualized edge switching device by:

identifying characteristics of the physical wiretap that enable the physical wiretap to filter packets; and

providing, within the virtualized edge switching device, a set of software-defined network rules based on the characteristics of the physical wiretap and containing criteria for identifying packets having at least one predetermined property associated with a security policy that:

is defined by a tenant of the virtual network; and

comprises a data loss prevention policy applied to packets distributed from a source port of the virtualized edge switching device to outside the virtual network;

intercepting, at the source port of the virtualized edge switching device, a packet destined for a destination port that resides outside of the virtual network;

determining that at least one characteristic of the packet satisfies at least one of the software-defined network rules; and

in response to determining that the characteristic of the packet satisfies at least one of the software-defined network rules:

creating a copy of the packet;

forwarding, via a tunneling mechanism, the copy of the packet to a virtual tap port that is located outside of the virtual network and performs a security analysis on the copy of the packet that is invisible to the tenant of the virtual network, wherein the tunneling mechanism encapsulates the copy of the packet at the source port and decapsulates the copy of the packet at the destination port; and

forwarding the packet to the destination port along an intended network path of the packet.

2. The method of claim 1 , wherein the tenant of the virtual network:

utilizes the virtual network to host a cloud-based application; and

requests that the virtualized edge switching device monitor packets passed between the cloud-based application and the additional virtual network.

3. The method of claim 1 , wherein the predetermined property associated with the security policy comprises at least one of:

a property of a destination of the packets;

a property of a source of the packets; and

a property of a protocol used to route the packets.

4. The method of claim 1 , wherein the virtualized edge switching device connects the source port to both additional ports within the virtual network and to ports outside the virtual network.

5. The method of claim 4 , wherein:

the security policy further comprises a malware detection policy applied to network traffic distributed from outside the virtual network to an additional destination port that resides within the virtual network.

6. The method of claim 1 , wherein the virtual tap port is outside of the control of the tenant of the virtual network.

7. The method of claim 1 , further comprising:

determining, based on an analysis of the copy of the packet at the virtual tap port, that the packet comprises a security threat; and

performing at least one security action in response to determining that the packet comprises the security threat.

8. The method of claim 1 , further comprising:

intercepting, at the source port, an additional packet that contains at least one property that satisfies at least one of the software-defined network rules;

determining, based on additional criteria within the set of software-defined network rules, that a current network traffic load within the virtual network exceeds a predetermined threshold; and

in response to determining that the current network traffic load exceeds the predetermined threshold, forwarding a copy of the additional packet to an additional virtual tap port instead of the virtual tap port.

9. A system for monitoring virtual networks, the system comprising:

an identification module, stored in memory, that identifies, within a cloud-computing environment that hosts a plurality of virtual networks, a virtual network comprising at least one virtualized edge switching device that handles, using a software-defined network protocol, all packets passed between the virtual network and at least one additional virtual network within the cloud-computing environment;

a providing module, stored in the memory, that emulates a physical wiretap within the virtualized edge switching device by:

identifying characteristics of the physical wiretap that enable the physical wiretap to filter packets; and

providing, within the virtualized edge switching device, a set of software-defined network rules based on the characteristics of the physical wiretap and containing criteria for identifying packets having at least one predetermined property associated with a security policy that:

is defined by a tenant of the virtual network; and

comprises a data loss prevention policy applied to packets distributed from a source port of the virtualized edge switching device to outside the virtual network;

an interception module, stored in the memory, that intercepts, at the source port of the virtualized edge switching device, a packet destined for a destination port that resides outside of the virtual network;

a determination module, stored in the memory, that determines that at least one characteristic of the packet satisfies at least one of the software-defined network rules;

a forward module, stored in the memory, that in response to determining that the characteristic of the packet satisfies at least one of the software-defined network rules:

creates a copy of the packet;

forwards, via a tunneling mechanism, the copy of the packet to a virtual tap port that is located outside of the virtual network and performs a security analysis on the copy of the packet that is invisible to the tenant of the virtual network, wherein the tunneling mechanism encapsulates the copy of the packet at the source port and decapsulates the copy of the packet at the destination port; and

forwards the packet to the destination port along an intended network path of the packet; and

at least one hardware processor that executes the identification module, the providing module, the interception module, the determination module, and the forward module.

10. The system of claim 9 , wherein the tenant of the virtual network:

utilizes the virtual network to host a cloud-based application; and

requests that the virtualized edge switching device monitor packets passed between the cloud-based application and the additional virtual network.

11. The system of claim 9 , wherein the predetermined property associated with the security policy comprises at least one of:

a property of a destination of the packets;

a property of a source of the packets; and

a property of a protocol used to route the packets.

12. The system of claim 9 , wherein the virtualized edge switching device connects the source port to both additional ports within the virtual network and to ports outside the virtual network.

13. The system of claim 12 , wherein:

the security policy further comprises a malware detection policy applied to network traffic distributed from outside the virtual network to an additional destination port that resides within the virtual network.

14. The system of claim 9 , wherein the virtual tap port is outside of the control of the tenant of the virtual network.

15. The system of claim 9 , further comprising:

an analysis module that determines, based on an analysis of the copy of the packet at the virtual tap port, that the packet comprises a security threat; and

a security module that performs at least one security action in response to the determination that the packet comprises the security threat.

16. The system of claim 9 , wherein:

the interception module intercepts, at the source port, an additional packet that contains at least one property that satisfies at least one of the software-defined network rules;

the determination module determines, based on additional criteria within the set of software-defined network rules, that a current network traffic load within the virtual network exceeds a predetermined threshold; and

in response to the determination that the current network traffic load exceeds the predetermined threshold, the forward module forwards a copy of the additional packet to an additional virtual tap port instead of the virtual tap port.

17. A non-transitory computer-readable medium comprising one or more computer-readable instructions that, when executed by at least one processor of a computing device, cause the computing device to:

identify, within a cloud-computing environment that hosts a plurality of virtual networks, a virtual network comprising at least one virtualized edge switching device that handles, using a software-defined network protocol, all packets passed between the virtual network and at least one additional virtual network within the cloud-computing environment;

emulate a physical wiretap within the virtualized edge switching device by:

identifying characteristics of the physical wiretap that enable the physical wiretap to filter packets; and

providing, within the virtualized edge switching device, a set of software-defined network rules based on the characteristics of the physical wiretap and containing criteria for identifying packets having at least one predetermined property associated with a security policy that:

is defined by a tenant of the virtual network; and

comprises a data loss prevention policy applied to packets distributed from a source port of the virtualized edge switching device to outside the virtual network;

intercept, at a source port of the virtualized edge switching device, a packet destined for a destination port that resides outside of the virtual network;

determine that at least one characteristic of the packet satisfies at least one of the software-defined network rules; and

in response to determining that the characteristic of the packet satisfies at least one of the software-defined network rules:

create a copy of the packet;

forward, via a tunneling mechanism, the copy of the packet to a virtual tap port that is located outside of the virtual network and performs a security analysis on the copy of the packet that is invisible to the tenant of the virtual network, wherein the tunneling mechanism encapsulates the copy of the packet at the source port and decapsulates the copy of the packet at the destination port; and

forward the packet to the destination port along an intended network path of the packet.

18. The non-transitory computer-readable medium of claim 17 , wherein the tenant of the virtual network:

utilizes the virtual network to host a cloud-based application; and

requests that the virtualized edge switching device monitor packets passed between the cloud-based application and the additional virtual network.