I2NSF network security function facing interface YANG data model

1. A method of providing a security service by means of a network operator management system in a security management system, the method comprising:

receiving a high-level first security policy from an I2NSF (Interface to Network Security Functions) user;

receiving an available security service from a developer's management system;

creating a low-level second security policy corresponding to the first security policy on the basis of the security service; and

transmitting a packet including the second security policy for setting the created second security policy to each of a plurality of NSFs (Network Security Function) to an NSF instance,

wherein the network operator management system and the NSFs are respectively connected to an I2NSF NSF-facing interface, and

wherein the second security policy includes at least one or more of 1) blocking SNS access during business hours, 2) blocking a malicious VoIP (Voice over Internet Protocol) or a malicious VoCN (Voice over Cellular Network) packet, or 3) mitigating flood of http and https for a company web server.

2. The method of claim 1 , wherein the second security policy includes an applied policy rule, and default action information showing an action for a generic security function.

3. The method of claim 2 , wherein the policy rule includes policy information and rule information, and

the rule information includes an event clause showing a change of a system, a condition clause showing an application condition of a policy rule, and an action clause showing a security function that is performed when the event clause and the condition clause are satisfied.

4. The method of claim 3 , wherein, on the basis of the fact that the second security policy is for blocking SNS access during business hours, the policy rule further includes time information for enabling the policy rule to be applied only during the business hours and a source IP address for examining a transmission packet.

5. The method of claim 4 , wherein, on the basis of the time information and the source IP address, when a URL (Uniform Resource Locator) of the transmission packet is a URL of a specific SNS, transmission of the transmission packet is dropped.

6. The method of claim 3 , wherein, on the basis of the fact that the second security policy is for blocking the malicious VoIP or the malicious VoCN packet, the policy rule further includes 1) an IP address and 2) a port number to which the malicious VoIP or the malicious VoCN packet are received.

7. The method of claim 6 , wherein, on the basis of the 1) IP address and the 2) port number, a packet matched with a voice ID of the malicious VoIP or the malicious VoCN packet is dropped.

8. The method of claim 3 , wherein, on the basis of the fact that the second security policy is for mitigating flood of http and https for the company web server, the policy rule further includes 1) IP address and 2) port number of a packet received to the company web server.

9. The method of claim 8 , wherein, on the basis of the 1) IP address and the 2) port number, when a reception ratio per second in which a packet received to the company web server can be allowed is exceeded, a packet that is received to the company web server is dropped.

10. The method of claim 3 , wherein the condition clause further includes information about a range of an IP address for matching.

11. A security management system for providing a security service, the security management system comprising:

an I2NSF (Interface to Network Security Functions) creating a high-level first security policy;

a developer's management system providing a security service;

a network operator management system receiving the first security policy from the I2NSF user, receiving the security service from the developer's management system, creating a low-level second security policy corresponding to the first security policy on the basis of the security service, and transmitting a packet including the second security policy for setting the created second security polity to each of a plurality of NSFs (Network Security Function), to an NSF instance; and

a plurality of NSFs (Network Security Function) receiving the second security policy from the security management system,

wherein the network operator management system and the NSFs are respectively connected to an I2NSF NSF-facing interface, and

wherein the second security policy includes at least one or more of 1) blocking SNS access during business hours, 2) blocking a malicious VoIP (Voice over Internet Protocol) or a malicious VoCN (Voice over Cellular Network)) packet, or 3) mitigating flood of http and https for a company web server.

12. The security management system of claim 11 , wherein the second security policy includes an applied policy rule, and default action information showing an action for a generic security function.

13. The security management system of claim 12 , wherein the policy rule includes policy information and rule information, and

the rule information includes an event clause showing a change of a system, a condition clause showing an application condition of a policy rule, and an action clause showing a security function that is performed when the event clause and the condition clause are satisfied.

14. The security management system of claim 13 , wherein on the basis of the fact that the second security policy is for blocking SNS access during business hours, the policy rule further includes time information for enabling the policy rule to be applied only during the business hours and a source IP address for examining a transmission packet.

15. The security management system of claim 14 , wherein on the basis of the time information and the source IP address, when a URL (Uniform Resource Locator) of the transmission packet is a URL of a specific SNS, transmission of the transmission packet is dropped.

16. The security management system of claim 13 , wherein on the basis of the fact that the second security policy is for blocking the malicious VoIP or the malicious VoCN packet, the policy rule further includes 1) an IP address and 2) a port number to which the malicious VoIP or the malicious VoCN packet are received.

17. The security management system of claim 16 , wherein, on the basis of the 1) IP address and the 2) port number, a packet matched with a voice ID of the malicious VoIP or the malicious VoCN packet is dropped.

18. The security management system of claim 13 , wherein, on the basis of the fact that the second security policy is for mitigating flood of http and https for the company web server, the policy rule further includes 1) IP address and 2) port number of a packet received to the company web server.

19. The security management system of claim 18 , wherein, on the basis of the 1) IP address and the 2) port number, when a reception ratio per second in which a packet received to the company web server can be allowed is exceeded, a packet that is received to the company web server is dropped.

20. The security management system of claim 13 , wherein the condition clause further includes information about a range of an IP address for matching.