WO2023211121A1

WO2023211121A1 - System for controlling file transmission and reception of application on basis of proxy, and method therefor

Info

Publication number: WO2023211121A1
Application number: PCT/KR2023/005627
Authority: WO
Inventors: 김영랑
Original assignee: 프라이빗테크놀로지 주식회사
Priority date: 2022-04-28
Filing date: 2023-04-25
Publication date: 2023-11-02
Also published as: KR102495370B1

Abstract

A gateway according to one embodiment in the present document comprises: a communication circuit; a processor operatively connected to the communication circuit; and a memory, which is operatively connected to the processor and stores a proxy server, wherein the memory can store instructions so that, when executed by the processor, the gateway receives a data flow including file input/output (IO) information indicating whether encryption is required when a file of a node is transmitted from an external server or whether decryption is required when the file is received, and processes, through the proxy server, a service processing request or a service processing request result on the basis of whether the file information is included in the service processing request of the node or the service processing request result.

Description

System and method for controlling file transmission and reception of applications based on proxy

Cross-citation with related applications

The present invention claims the benefit of priority based on Korean Patent Application No. 10-2022-0053103 filed on April 28, 2022, and all contents disclosed in the document of the Korean Patent Application are included as part of this specification.

Technology field

Embodiments disclosed in this document relate to a system and method for controlling file transmission and reception of an application based on a proxy.

Multiple devices can communicate data over a network. For example, a terminal can transmit or receive data to and from a server via the Internet. Networks may include public networks such as the Internet as well as private networks such as intranets.

The terminal communicates with the server using IP (Internet Protocol)-based TCP (Transmission Control Protocol) or UDP (User Datagram Protocol), and is used to control the connection between the source IP and destination IP authorized by TCP or UDP technology. Firewall technology may be used. In the case of such IP communication, there is a problem that IP can be forged or altered, so to solve this problem, VPN (Virtual Private Network) technology and tunneling technology are used to encrypt data packets between the terminal and the server.

When using a VPN based on tunneling technology, which is created at the terminal level or per IP assigned to the terminal, there is a vulnerability in which unauthorized or insecure applications can access unauthorized destination networks through tunneling that is always connected after initial authentication. Therefore, security incidents caused by various malware and ransomware infiltration are increasing. To solve this problem, by applying application connectivity control technology that allows only permitted applications to access the permitted network, the application that is the fundamental communication subject can be identified and access by unauthorized applications can be blocked in advance.

For example, while a permitted application can connect to a permitted network, you may not be able to control the application's ability to receive or transmit files over the network. DLP (Data Loss Prevention) exists as a technology to solve these problems, and DLP prevents unauthorized media (e.g. USB or removable storage devices) from being connected or sharing specific folders on the network. Or, when a specific application selects a file for file transfer, it prevents the file from being transferred by blocking the file from being selected, or when file input/output of a specific application occurs or when tracking file input/output, the user If you do not have file input/output permission, you can prevent data leakage by removing the file input/output handle.

This DLP technology may not be able to prevent unauthorized media from being connected in a work-from-home environment using personally owned terminals in areas where physical security control is not possible and where there are limitations in applying security policies. Furthermore, DLP technology that tracks specific actions may not be able to prevent, for example, non-user malware from directly loading and transmitting files without a file selection window if a specific action is not performed. In addition, DLP technology, which tracks file input and output of a specific application, tracks file input and output for a specific application and blocks it altogether, so it may be difficult to allow file transfer on the network connected to the application. In the case of DLP, which provides a method to lift file input/output restrictions by identifying the access address window of the Internet browser, network access information cannot be tracked in the case of applications without an access address window, so there are limitations in controlling file reception and transmission. There may be.

In addition, when uploading a file to a work server that exists on a network that the terminal can control, file encryption is performed through a service application (or web application), or the file is uploaded without encryption processing, and the network and physical You can prevent files from being leaked through access control. To solve this problem, DRM (Digital Right Management) technology exists to encrypt files and decrypt them only for those who can read the files.

However, in environments such as cloud environments and software as a service applications, there are limits to network access control, and due to the nature of the environment, it is always exposed to the Internet, preventing defects in service applications (e.g. zero day attacks). )), gaining access through brute force attacks, or credential stuffing), or unauthorized access by cloud or service providers (e.g. data mining and machine learning), ensuring the safety of uploaded files. You may not be able to do it. In addition, because DRM technology uniformly encrypts files, it only encrypts files uploaded to the cloud and does not encrypt files when uploaded to a business server that exists on a controllable network. Depending on this, selective encryption may not be possible.

Therefore, when a target application uploads a file to a cloud environment that must protect the file, there is a technology that can encrypt the file uploaded to the cloud in a form that cannot be decrypted even if it is downloaded by someone other than the entity that has ownership. It is necessary, and when uploading a file to a business server that exists on a network that the target application can control, it is an optional file that does not perform separate encryption on the terminal so that the service application that exists on the server can perform its own encryption processing. Encryption technology is required.

Various embodiments disclosed in this document are intended to provide a system and method for solving the above-described problems in a network environment.

A gateway according to an embodiment disclosed in this document includes a communication circuit, a processor operatively connected to the communication circuit, and a memory operatively connected to the processor and storing a proxy server, When the memory is executed by the processor, the gateway receives a data flow including file IO (input output) information indicating whether encryption is necessary when transmitting a file of a node from an external server or whether decryption is required when receiving a file, Through the proxy server, commands for processing the service processing request or the service processing request result based on whether file information is included in the node's service processing request or service processing request result may be stored.

A server according to an embodiment disclosed in this document includes a communication circuit, a processor operatively connected to the communication circuit, and a memory operatively connected to the processor and storing a database, the memory comprising: When executed by the processor, the server receives a network connection request including identification information of a target application of the node that wants to connect to the network of the service server and network information of the service server from the node's connection control application, and the database Based on this, it is checked whether the target application can connect to the service server, and if connection is possible, it corresponds to the network information of the service server, and whether encryption is required when transmitting the file of the node or decryption is required when receiving the file. A data flow including file IO (input output) information indicating a data flow is generated and transmitted to the node and the gateway, and when connection is not possible, commands may be stored to transmit result information indicating the inability to connect to the node.

A method of operating a gateway according to an embodiment disclosed in this document includes receiving a data flow including file IO (input output) information indicating whether encryption is required when transmitting a file from a node or whether decryption is required when receiving a file from an external server. An operation of processing the service processing request or the service processing request result based on whether file information is included in the service processing request or the service processing request result of the node through the proxy server of the gateway. You can.

A method of operating a server according to an embodiment disclosed in this document includes a network connection request including identification information of a target application of the node to connect to the network of the service server and network information of the service server from the node's connection control application. An operation of receiving, an operation of checking whether the target application can connect to the service server based on the database, and corresponding to network information of the service server, whether encryption is required when transmitting a file of the node or receiving a file. It may include generating a data flow including file input output (IO) information indicating whether decryption is necessary and transmitting it to the node and gateway.

According to the embodiments disclosed in this document, it is possible to control file reception and transmission for each application and network by checking whether to allow file input and output of the identified target and allowing file input and output only to the permitted access target. do.

According to embodiments disclosed in this document, file information included in the service request and service request result between the authenticated terminal and the service server can be monitored through a proxy included in the gateway, and file encryption or decryption can be controlled.

According to embodiments disclosed in this document, transmitted and received files can be selectively encrypted or decrypted according to the policy of the controller.

In addition, various effects that can be directly or indirectly identified through this document may be provided.

1 shows an architecture within a network environment according to various embodiments.

Figure 2 is a functional block diagram showing a database stored in a controller according to various embodiments.

Figure 3 shows control flow information, data flow information, and file table information among information included in a database according to various embodiments.

4 is a functional block diagram of a node according to various embodiments.

Figure 5 explains an operation for controlling transmission of data packets according to various embodiments.

Figure 6 shows a signal flow diagram for controller connection according to various embodiments.

7 shows a signal flow diagram for user authentication according to various embodiments.

8 illustrates a user interface screen for accessing a controller according to various embodiments.

Figure 9 shows a signal flow diagram for network access according to various embodiments.

Figure 10 shows a signal flow diagram for processing a service processing request according to various embodiments.

Figure 11 shows a signal flow diagram for receiving a service processing request result according to various embodiments.

Figure 12 shows a signal flow diagram for transmitting a service request processing log and a rejection log according to various embodiments.

Figure 13 shows a signal flow diagram for control flow update according to various embodiments.

Figure 14 shows a signal flow diagram for control flow removal according to various embodiments.

Figure 15 shows a signal flow diagram for data flow removal according to various embodiments.

Hereinafter, various embodiments of the present invention are described with reference to the accompanying drawings. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include various modifications, equivalents, and/or alternatives to the embodiments of the present invention.

In this document, the singular form of a noun corresponding to an item may include one or plural items, unless the relevant context clearly indicates otherwise. In this document, “A or B”, “at least one of A and B”, “at least one of A or B”, “A, B or C”, “at least one of A, B and C” and “A, Each of phrases such as “at least one of B, or C” may include any one of the items listed together in the corresponding phrase, or any possible combination thereof. Terms such as "first", "second", or "first" or "second" may be used simply to distinguish one component from another, and to refer to that component in other respects (e.g., importance or order) is not limited. One (e.g., first) component is said to be “coupled” or “connected” to another (e.g., second) component, with or without the terms “functionally” or “communicatively.” When mentioned, it means that any of the components can be connected to the other components directly (e.g. wired), wirelessly, or through a third component.

Each component (eg, module or program) described in this document may include singular or plural entities. According to various embodiments, one or more of the corresponding components or operations may be omitted, or one or more other components or operations may be added. Alternatively or additionally, multiple components (eg, modules or programs) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each component of the plurality of components in the same or similar manner as those performed by the corresponding component of the plurality of components prior to the integration. . According to various embodiments, operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or , or one or more other operations may be added.

The term “module” used in this document may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit, for example. A module may be an integrated part or a minimum unit of the parts or a part thereof that performs one or more functions. For example, according to one embodiment, the module may be implemented in the form of an application-specific integrated circuit (ASIC).

Various embodiments of this document may be implemented as software (e.g., a program or application) including one or more instructions stored in a storage medium (e.g., memory) that can be read by a machine. For example, the processor of the device may call at least one instruction among one or more instructions stored from a storage medium and execute it. This allows the device to be operated to perform at least one function according to the at least one instruction called. The one or more instructions may include code generated by a compiler or code that can be executed by an interpreter. A storage medium that can be read by a device may be provided in the form of a non-transitory storage medium. Here, 'non-transitory' only means that the storage medium is a tangible device and does not contain signals (e.g. electromagnetic waves), and this term refers to cases where data is semi-permanently stored in the storage medium. There is no distinction between temporary storage cases.

Methods according to various embodiments disclosed in this document may be provided and included in a computer program product. Computer program products are commodities and can be traded between sellers and buyers. A computer program product may be distributed in the form of a machine-readable storage medium (e.g. compact disc read only memory (CD-ROM)) or through an application store or between two user devices (e.g. smartphones). It may be distributed in person or online (e.g., downloaded or uploaded). In the case of online distribution, at least a portion of the computer program product may be at least temporarily stored or temporarily created in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store server, or a relay server.

The node 201-1 or 201-2 shown in FIG. 1 may be various types of devices capable of performing data communication. For example, the node 201-1 or 201-2 may be a portable device such as a smartphone or tablet, a computer device such as a desktop or laptop, a multimedia device, a medical device, a camera, a wearable device, or VR. It may include a (virtual reality) device, or a home appliance device, and is not limited to the above-described devices. For example, node 201-1 or 201-2 may include a server or gateway capable of transmitting data packets through an application. The node 201-1 or 201-2 may also be referred to as an ‘electronic device’ or a ‘terminal’.

Node 201-1 or 201-2 may store at least one target application and at least one access control application, respectively. For example, the node 201-1 may store the target application 211-1 and the access control application 212-1. The node 201-2 may store the target application 211-2 and the access control application 212-2.

Each of the target applications (211-1 or 211-2) transmits data packets to the service server (205-1 or 205-2) through the gateway 203 under the control of the access control application (212-1 or 212-2). Or, conversely, you can receive data packets.

Some of the target applications (211-1 and 211-2) are allowed and/or secured applications, such as web browsers or business applications, while others are non-allowed programs (e.g. malware, ransomware, and other unallowed programs). It may be an unsecured application) or an insecure malicious program (an application infected with malware, forged or altered). According to embodiments, the access control application (212-1 or 212-2) identifies a program (or target application, process of the target application) requesting transmission of a data packet, and data packets of the unauthorized program are transmitted to the node ( It is possible to prevent transmission outside of 201-1 or 201-2). Additionally, according to embodiments, the access control application (212-1 or 212-2) is connected to the connection control application (212-1 or 212-2) and the gateway 203 through a channel (220-1 or 220-2). Access to the service server (205-1 or 205-2) of unauthorized programs can be blocked and the program can be quarantined. Channel 220-1 or 220-2 may also be referred to as a 'secure session'.

For example, before the target application (211-1 or 211-2) according to embodiments communicates with the service server (205-1 or 205-2), the access control application (212-1 or 212-2) is connected to the controller. It is possible to check whether connection is possible from 202, and if connection is possible, authentication with the gateway 203 can be performed through a data packet authenticated by the controller 202. Once authentication is completed, the access control application (212-1 or 212-2) can create the gateway 203 and the channel (220-1 or 220-2).

According to various embodiments, the node 201-1 or 201-2 is a connection control application for managing the network connection of the target application 211-1 or 211-2 stored in the node 201-1 or 201-2. (212-1 or 212-2) and a network driver (not shown). For example, when a connection event occurs for the service server (205-1 or 205-2) of the target application (211-1 or 211-2) stored in the node (201-1 or 201-2), the connection control application (212-1 or 212-2) may determine whether the target application (211-1 or 211-2) is accessible. If the target application (211-1 or 211-2) is accessible, the access control application (212-1 or 212-2) transmits a data packet to the gateway 203 through the channel (220-1 or 220-2). You can. The access control application 212-1 or 212-2 may control the transmission of data packets within the node 201-1 or 201-2 through a kernel including an operating system and a network driver.

The controller 202 may be, for example, a server (or cloud server). The controller 202 manages data transmission between the node 201-1 or 201-2, the gateway 203, and the service server 205-1 or 205-2 to ensure reliable data transmission within the network environment. You can. For example, the controller 202 allows the authorized node 201-1 or 201-2 (or access control application 212-1 or 212-2) to access the network through policy information or blacklist information. can do.

Additionally, the controller 202 mediates the creation of a channel (220-1 or 220-2) between the access control application (212-1 or 212-2) and the gateway 203, or connects the node (201-1 or 201-2) ), the channel 220-1 or 220-2 may be removed (or recovered) according to security events collected from the gateway 203, or other linked security systems (not shown). The access control application (212-1 or 212-2) can communicate with the service server (205-1 or 205-2) only through the channel (220-1 or 220-2) authorized by the controller 202, If the authorized channel (220-1 or 220-2) does not exist, network access of the node (201-1 or 201-2) and the access control application (212-1 or 212-2) may be blocked. In one embodiment, the target application (211-1 or 211-2) communicates with the service server (205-1 or 205-2) only through the channel (220-1 or 220-2) authorized by the controller 202. This can be done, and if the authorized channel (220-1 or 220-2) does not exist, the network connection of the target application (211-1 or 211-2) is connected to the access control application (212-1 or 212-2), the controller ( 202) or may be blocked from the gateway 203. According to one embodiment, the controller 202 performs various operations associated with network access of the node 201-1 or 201-2 or the access control application 212-1 or 212-2 (e.g., registration, authorization, authentication, In order to perform (update, termination), control data packets can be transmitted and received with the access control application (212-1 or 212-2). The flow through which control data packets are transmitted (e.g., 230-1 or 230-2) may be referred to as a 'control flow'.

The gateway 203 may be located at the border of the network to which the node 201-1 or 201-2 belongs or at the border of the network to which the service server 205-1 or 205-2 belongs. For example, the gateway 203 may be located at the boundary of an intranet or cloud. According to one embodiment, the gateway 203 may be connected to the controller 202 on a cloud basis. The gateway 203 may forward only authorized data packets among the data packets received from the access control application 212-1 or 212-2 to the service server 205-1 or 205-2. The flow in which data packets are transmitted between the access control application (212-1 or 212-2) and the gateway 203 (e.g., 240-1 or 240-2) may be referred to as 'data flow'. .

Data flows can be created not only on a per-node or per-IP basis, but also on a more granular basis (e.g. per-application). The gateway 203 authenticates the access control application (212-1 or 212-2) before creating the channel (220-1 or 220-2) between the access control application (212-1 or 212-2) and the gateway 203. Perform, and among the data packets transmitted from the access control application (212-1 or 212-2), only the data packets transmitted through the channel (220-1 or 220-2) are sent to the service server (205-1 or 205-2). By forwarding to , indiscriminate network access can be blocked in advance.

The gateway 203 can relay service processing between the authenticated node 201-1 or 201-2 and the service server 205-1 or 205-2 through the proxy server 231 included in the gateway 203. there is. The gateway 203 monitors the file information included in the service processing request and the service processing request result through the proxy server 231, and processes the file based on the file IO information included in the data flow 240-1 or 240-2. Encryption and decryption can be controlled. The proxy server 231 may also be referred to as a 'proxy'. The proxy server 231 may be a program or application.

Figure 2 is a functional block diagram showing a database stored in the controller 202 according to various embodiments, and Figure 3 shows control flow information 340, data flow information 350, and file table information ( 360).

Referring to FIG. 2, the controller 202 may store databases 311 to 320 for controlling network connection and data transmission in the memory 330. Although FIG. 2 shows only the memory 330, the controller 202 can be used to connect external electronic devices (e.g., node 201-1 or 201-2 in FIG. 1, gateway 203, or service server 205-1 or 205- 2))) and a communication circuit for performing communication (e.g., the communication circuit 430 in FIG. 4) and a processor for controlling the overall operation of the controller 202 (e.g., the processor 410 in FIG. 4). can do. The administrator can access the controller 202 and set a connection-oriented policy to control the connection between the access control application (212-1 or 212-2) and the service server (205-1 or 205-2), so the service terminal You can control network access more precisely and safely than managing sessions in .

The connection policy database 311 may include information about networks and/or services to which an identified network, node, or application can access. For example, when the controller 202 requests network access from the access control application 212-1 or 212-2, the controller 202 connects to the network identified based on the policy of the access policy database 311 (e.g., node 201-1 or network to which 201-2) belongs), a node (201-1 or 201-2), a user (e.g., a user of node 201-1 or 201-2), and/or an application (e.g., node 201-1 Alternatively, it may be determined whether the target application (211-1 or 211-2) included in 201-2) can access the service server (205-1 or 205-2). In one embodiment, the controller 202 may create a whitelist of target applications that can access a specific service (eg, IP and port) based on the connection policy database 311.

The channel policy database 312 connects the node 201-1 or 201-2 and the service server 205-1 or 201-2 (or destination IP and port) on the connection path according to the policy of the connection policy database 311. It may include information necessary for creating a channel with the gateway 203 (eg, authentication information, encryption algorithm, and/or tunnel end point IP). If a channel previously connected through another gateway exists between the access paths, the channel policy database 312 may include information for using it (e.g., whether IP information assigned to the node is collected and whether alternative processing is performed). there is.

The channel table 318 may include a channel dedicated IP assigned to the node 201-1 or 201-2 and channel creation information.

The service policy database 313 connects the node 201-1 or 201-2 and the service server 205-1 or 201-2 (or destination IP and port) on the connection path according to the policy of the connection policy database 311. The node 201-1 or 201-2 connects the domain to relay the service processing request with the service server 205-1 or 205-2 through the proxy server 231 included in the gateway 203 existing between the domain. When attempting to connect to an address, information required to pass through the proxy server 231 (e.g., domain address resolution information, certificate required to access the domain, and/or whether to return the service processing request result as failure information when the data flow check fails) Information on whether to redirect to another URL) may be included.

The file IO policy database 314 is linked to the access policy and may include information for establishing a file IO policy for the target application 211-1 or 211-2. For example, the file IO policy database 314 may include information about whether to decrypt a file when receiving it from the target application 211-1 or 211-2 and information about whether to encrypt the file when transmitting it. Additionally, the file IO policy database 314 may include algorithms used for encryption or decryption, and/or encryption or decryption key generation information.

The blacklist policy database 315 includes targets ( Example: It may indicate a blacklist registration policy to block access by at least one of a node ID (identifier), IP address, MAC (media access control) address, or user ID).

The blacklist database 320 may include a list of targets blocked by the blacklist policy database 315. For example, if the identification information of the node (201-1 or 201-2) requesting network access is included in the blacklist database 320, the controller 202 rejects the network access request, thereby allowing the node (201-1 or 201) to access the network. -2) can be isolated.

The control flow table 316 is an example of a session table for managing the flow (i.e., control flow) of control data packets generated between the access control application 212-1 or 212-2 and the controller 202.

For example, referring to Figure 3, when the access control application (212-1 or 212-2) successfully connects to the controller 202, control flow information 340 and control flow ID 342 (or 'control flow (may also be referred to as 'identification information') may be generated by the controller 202. The control flow information 340 may include identification information 344 representing at least one of an IP identified during controller connection and authentication, a node, an application, or a target additionally identified through linkage with a service server. For example, when a network connection request from the access control application 212-1 or 212-2 is received, the controller 202 sends the control flow ID and identification information included in the connection request to the control flow information 340. Whether the access control application (212-1 or 212-2) can be connected to the service server (205-1 or 205-2) by mapping with the flow ID (342) and identification information (344) and the channel with the gateway (203) You can decide whether or not it is possible to create a data flow for creation. Status information 346 may indicate various states such as creation, authentication, update, termination, etc. of a control flow.

According to one embodiment, since the control flow has an expiration time, the node 201 must update the expiration time of the control flow based on the time information 348, and if the expiration time is not updated within a certain period of time, the control flow ( Alternatively, control flow information 340) may be removed. In addition, immediate access is blocked according to security events collected from the node 201-1 or 201-2, the access control application 212-1 or 212-2, another security application (not shown), or the gateway 203. If it is determined that this is necessary, or if a connection termination request is received from them, the controller 202 may remove the control flow. When the control flow is removed, the related data flow is also removed, and the gateway 203 connects the service server 205-1 or 205 of the access control application 212-1 or 212-2 or the target application 211-1 or 211-2. Access to -2) can be blocked.

The data flow table 317 shows the flow (e.g., data flow) in which detailed data packets are transmitted between the node 201-1 or 201-2, the gateway 203, and the service server 205-1 or 205-2. ) is a table for managing. Data flows can be created by TCP sessions, applications, or more granular units. The data flow table 316 may include an application ID, destination IP address, and/or service port to identify whether the data packet transmitted from the source is an authorized data packet.

Referring to FIG. 3, the data flow information 350 may include a data flow ID 351 for identifying the data flow and a control flow ID 352 if the data flow is dependent on the control flow. Since the node (201-1 or 201-2) or the access control application (212-1 or 212-2) can create a channel and session with one or more gateways, the controller 202 controls the control flow ID assigned to the transmitting subject. With (352), data flows dependent on it can be managed. Additionally, the data flow information 350 determines whether a channel has been created between the access control application 212-1 or 212-2 and the gateway 203, and whether the service server 205-1 or 205-2), data is collected based on URL information and domain information to control service requests according to the source IP and destination IP of the data packet, service port information, protocol information, certificate information, and service request path (URL). It may include inspection target information 353 to determine packet forwarding. Additionally, the data flow information 350 may include status information 356 indicating whether the data flow is in a valid usable state. Additionally, the data flow information 350 may further include file IO information 354. The file IO information 354 may include whether decryption is necessary when receiving the file, whether encryption is necessary when transmitting the file, and exception information for file IO processing. The file IO information 354 may include target information (or policy information) (domain information, URL information, and/or file type information) to which control information for file encryption or decryption is applied. Additionally, the data flow information 350 may further include encryption/decryption information 355 for encrypting or decrypting a file. For example, the encryption and decryption information 355 may include information about whether the encryption key is generated by the gateway or the controller when encrypting a file when transmitting a file, an encryption key, and an encryption algorithm.

The file table 319 is a database for managing file encryption or decryption and may include file table information 360.

Referring to FIG. 3, the file table information 360 may store inspection target information 362 for identifying the inspection target where file transmission and reception occurred in the gateway 203. The inspection target information 362 may include, for example, source IP and destination IP, service port information, protocol information, certificate information, service request path (URL), and domain information. Additionally, the file table information 360 may include file information 364 for searching the encryption key or decryption key of the file. The file information 364 may include unique information and identification information of the file (eg, file name, partial contents of the file or header information, hash information, and/or signature information). Additionally, the file table information 360 may further include encryption and decryption information 366. The encryption/decryption information 366 may include a key used to encrypt a file, a key used to decrypt a file, an encryption algorithm type, and a decryption algorithm type. File table information 360 may be managed in the controller 202 and gateway 203.

Figure 4 shows a functional block diagram of a node 201-1 or 201-2 according to various embodiments. At least some of the configurations shown in FIG. 4 may be applied to the controller 202, gateway 203, or service server 205-1 or 205-2.

Referring to FIG. 4, node 201-1 or 201-2 may include a processor 410, memory 420, and communication circuit 430. According to one embodiment, the node 201-1 or 201-2 may further include a display 440 to provide a user interface.

The processor 410 can control the overall operation of the node. In various embodiments, the processor 410 may include one processor core (single core) or may include a plurality of processor cores. For example, the processor 410 may include multi-core, such as dual-core, quad-core, or hexa-core. Depending on embodiments, the processor 410 may further include a cache memory located internally or externally. Depending on embodiments, the processor 410 may be configured with one or more processors. For example, the processor 410 may include at least one of an application processor, a communication processor, or a graphical processing unit (GPU).

All or part of the processor 410 is electrically connected to other components (e.g., memory 420, communication circuit 430, or display 440) within node 201-1 or 201-2. ) or may be operatively coupled with or connected to. The processor 410 may receive instructions from other components, interpret the received instructions, and perform calculations or process data according to the interpreted instructions. The processor 410 may interpret and process messages, data, commands, or signals received from the memory 420, the communication circuit 430, or the display 440. Processor 410 may generate new messages, data, instructions, or signals based on received messages, data, instructions, or signals. Processor 410 may provide processed or generated messages, data, instructions, or signals to memory 420, communication circuit 430, or display 440.

The processor 410 can process data or signals generated or generated by a program. For example, the processor 410 may request instructions, data, or signals from the memory 420 to execute or control a program. The processor 410 may record (or store) or update instructions, data, or signals to the memory 420 in order to execute or control a program.

The memory 420 may store commands for controlling nodes, control command codes, control data, or user data. For example, the memory 420 may include at least one of an application program, an operating system (OS), middleware, or a device driver. Memory 420 may include one or more of volatile memory or non-volatile memory. Volatile memory includes dynamic random access memory (DRAM), static RAM (SRAM), synchronous DRAM (SDRAM), phase-change RAM (PRAM), magnetic RAM (MRAM), resistive RAM (RRAM), and ferroelectric RAM (FeRAM). It can be included. Non-volatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), flash memory, etc. The memory 420 uses non-volatile media such as a hard disk drive (HDD), solid state disk (SSD), embedded multi media card (eMMC), and universal flash storage (UFS). More may be included.

According to one embodiment, the memory 420 may store the target application 211-1 or 211-2 and the access control application 212-1 or 212-2 of FIG. 1. The access control application (212-1 or 212-2) can perform network connection and channel (220-1 or 220-2) creation with the gateway 203, and control flow creation and update functions with the controller 202. . To this end, the access control application 212-1 or 212-2 may include one or more security modules. In one embodiment, the memory 420 may store the control flow information 340, data flow information 350, and file table information 360 of FIG. 3.

In one embodiment, the target application 211-1 or 211-2 may include one or more security modules to create a channel 220-1 or 220-2 with the gateway 203.

Communication circuitry 430 establishes a wired or wireless communication connection between node 201-1 or 201-2 and an external electronic device (e.g., controller 202 or gateway 203), and performs communication over the established connection. can support. According to one embodiment, the communication circuit 430 may be a wireless communication circuit (e.g., a cellular communication circuit, a short-range wireless communication circuit, or a global navigation satellite system (GNSS) communication circuit) or a wired communication circuit (e.g., a local area network (LAN) ) communication circuit, or power line communication circuit), and using the corresponding communication circuit, a short-range communication network such as Bluetooth, WiFi direct, or IrDA (infrared data association) or a long-distance communication such as a cellular network, the Internet, or a computer network It can communicate with external electronic devices through a network. The various types of communication circuits 430 described above may be implemented as one chip or may be implemented as separate chips.

The display 440 can output content, data, or signals. In various embodiments, the display 440 may display image data processed by the processor 410. Depending on embodiments, the display 440 may be configured with an integrated touch screen by being combined with a plurality of touch sensors (not shown) capable of receiving touch input, etc. When the display 440 is configured as a touch screen, a plurality of touch sensors may be placed above the display 440 or below the display 440.

Referring to FIG. 5, the access control application 212 detects a network connection request to the service server 205 from the target application 211 included in the node 201, and connects the node 201 or the access control application 212. ) can be determined whether it is connected to the controller 202. If the node 201 or the access control application 212 is not connected to the controller 202, the access control application 212 may block the transmission of data packets in the kernel or network driver included in the operating system. The access control application 212 can only transmit data packets for requesting a connection to the controller 202, and if it is not connected to the controller 202, no data packets are transmitted to the service server 205. The access control application 212 connects to the controller 202 to perform identification and authentication for the target application 211, and after performing authentication, queries the controller 202 for access network information to the service server of the target application 211. It is possible to check whether access to (205) is possible, and only authorized applications can access the service server (205). Through the access control application 212, the node 201 can prevent access to malicious applications (e.g., ransomware or malware) in advance at the application layer among the 7 layers of OSI (open system interconnection). there is.

In one embodiment, if the access control application 212 is not authenticated by the gateway 203 or a channel is not created between the access control application 212 and the gateway 203, transmission from the access control application 212 The data packet may be blocked by the gateway 203. Depending on the embodiment, there may be cases where data packets transmitted from the access control application 212 are not blocked by the gateway 203 even if the access control application 212 is not authenticated by the gateway 203.

According to another embodiment, if the access control application 212 is not installed on the node 201 or a malicious application bypasses the control of the access control application 212, unauthorized data packets may be transmitted from the node 201. there is. In this case, the gateway 203 located at the border of the network blocks data packets received through unauthorized security sessions and data packets for which no data flow exists, so data packets transmitted from the node 201 (e.g. TCP session data packet for generation) may not reach the service server 205. In other words, the node 201 may be isolated from the service server 205.

Since the node 201 needs to be authorized by the controller 202 to access the network, the access control application 212 of the node 201 requests the controller 202 to create a control flow, thereby controlling the node 201. You can try to connect to the controller.

Referring to Figure 6, at operation 605, node 201 may detect a controller connection event. For example, if the connection control application 212 is installed and/or executed within node 201, node 201 may detect that a connection to controller 202 is requested.

In operation 610, the node 201 may request controller connection to the controller 202. For example, the access control application 212 may transmit identification information of the access control application 212 to the controller 202. Additionally, the access control application 212 may include identification information of the node 201 (e.g., terminal ID, IP address, MAC address), type, location, environment, identification information of the network to which the node 201 belongs, and/or the network. Random identification information generated by the system itself may be further transmitted.

In operation 615, the controller 202 may identify whether the controller connection request (e.g., the connection control application 212 and the node 201) can be connected to the controller. According to one embodiment, the controller 202 determines whether information received from the node 201 is included in the connection policy database 311, or controls the node 201, the network to which the node 201 belongs, and/or access control. It is possible to check whether the controller connection request of the object requesting controller connection is possible based on at least one of whether the identification information of the application 212 is included in the blacklist database 315.

If the object requesting controller connection can access the controller, the controller 202 can create a control flow between the node 201 (or the connection control application 212) and the controller 202. At operation 620, the controller 202 may create a control flow between the node 201 (or the connection control application 212) and the controller 202. In this case, the controller 202 generates control flow identification information in the form of a random number and stores the identification information of at least one of the node 201, the network to which the node 201 belongs, or the access control application 212 in the control flow table ( 316). Information (e.g., control flow information 340) stored in the control flow table 316 is used for user authentication of the node 201, update of information of the node 201, confirmation of policy for network access of the node 201, and/ Or it can be used for validation.

In operation 625, the controller 202 may check the connection policy corresponding to the information identified in the connection policy database 311 (e.g., information about the node 201 and the source network to which the node 201 belongs). The controller 202 may generate whitelist information of accessible applications based on the confirmed access policy. The controller 202 can check the channel policy through the IP of the node 201 identified in the channel policy database 312. The controller 202 lists the channel types and gateways that the node 201 can connect to based on the confirmed channel policy, and checks the status (e.g., throughput and/or failure) of the listed gateways to list them. Among the gateways, one channel and gateway optimized for the node 201 can be identified. In another embodiment, the controller 202 may not perform operations 620 and 625. For example, if the controller for the connection request is not available, the controller 202 may not perform operations 620 and 625.

In operation 630, the controller 202 may transmit a response to the controller connection request to the node 201. In one embodiment, the controller 202 may transmit control flow information 340 including control flow identification information to the node 201 in response to a controller connection request. In one embodiment, the controller 202 may transmit the white list created through operation 625 to the access control application 212. In one embodiment, the controller 202 may transmit information necessary to create a channel including the identified gateway and channel authentication information to the node 201 by performing operation 625. Depending on the embodiment, when connecting through a pre-connected channel between the node 201 and the gateway 203, or when connecting through another channel technology between the node 201 and the gateway 203, the controller 202 ) may not transmit separate channel creation information to the node 201. Depending on the embodiment, if the object requesting controller connection is unavailable or included in the blacklist, the controller 202 may not generate a control flow and may notify the controller 202 of the inability to connect in response to the controller connection request.

In one embodiment, node 201 may process the results according to the received response. For example, the connection control application 212 may store the received control flow identification information and display a user interface screen (not shown) to the user indicating that the controller connection is complete. Once the controller connection is completed, the network connection request of the node 201 to the service server 205 can be controlled by the controller 202.

Depending on the embodiment, the controller 202 may determine that the node 201 is inaccessible. For example, when information that controller connection is impossible is received, the node 201 may stop or end execution of the access control application 212 or display a user interface screen indicating that controller connection is impossible to the user. For example, the user interface screen indicates that access to the node 201 is blocked and may include a user interface that guides the release of isolation through an administrator (e.g., the controller 202).

Depending on the embodiment, the controller 202 may determine that channel creation is necessary. If channel creation is necessary, the controller 202 may transmit information for channel creation to the node 201. For example, when information for channel creation is received from the controller 202, the node 201 may perform a channel creation processing step. In operation 635, the node 201 may request the gateway 203 to create a channel. For example, the node 201 may request the gateway 203 to create a channel based on information for channel creation (eg, gateway and channel authentication information) received from the controller 202.

Depending on the embodiment, the controller 202 may determine that channel creation is unnecessary. For example, when information indicating that channel creation is unnecessary is received from the controller 202, or when information for creating a separate channel is not received from the controller 202, the node 201 It is determined that this is the case and the next step (application inspection step) can be performed.

In one embodiment, the access control application 212, the controller 202, and the gateway 203 of the node 201 may further perform operations 635 to 660. Depending on the embodiment, the access control application 212, the controller 202, and the gateway 203 of the node 201 may perform all or only part of operations 635 to 660.

At operation 640, the access control application 212 may perform a check of the application. For example, when a white list is received from the controller 202, the access control application 212 may check whether an application included in the white list is installed on the node 201. For applications included in the white list among applications installed on the node 201, the access control application 212 checks the integrity and stability of the application (whether the application is forged or tampered with, code signing inspection, and fingerprint inspection) according to the validation policy. at least one of) can be checked.

In operation 645, the access control application 212 may transmit the inspection result of the application to the controller 202. The controller 202 may check whether the application is valid based on the test result. If the application is valid, the controller 202 checks the gateway 203 where the node 201 is located in the access policy for the node 201 to allow the node 201 to access the network, and then performs operation 650. can do.

In operation 650, the controller 202 configures the source IP, destination IP, service port information, protocol information, and You can create a data flow that includes certificate information, domain, and URL information.

The controller 202 may check the file IO policy when creating a data flow and generate file IO information 354 based on the file IO policy. Data flow information 350 of the data flow may include generated file IO information 354. File IO information 354 may include policy information related to file IO access (e.g., sending (or uploading) and receiving (or downloading) files) of applications that use data flows. For example, the file IO information 354 may include whether to encrypt the file when the application transmits it and whether to decrypt the file when the application receives it. The file IO information 354 may include whether to encrypt or decrypt by URL and whether to encrypt or decrypt by file type when encrypting or decrypting a file.

In operation 655, the controller 202 may transmit a response to the transmission of the application check result of the access control application 212. For example, the controller 202 may transmit data flow information 350 including file IO information 354 to the access control application 212. Additionally, in operation 660, the controller 202 may transmit data flow information 350 including file IO information 354 to the gateway 203.

FIG. 7 illustrates a signal flow diagram for user authentication according to various embodiments, and FIG. 8 illustrates a user interface screen for connecting to a controller according to various embodiments. The operations shown in FIG. 7 may be implemented, for example, after the signal flow diagram of FIG. 6.

In order for the node 201 to be granted detailed access rights to the destination network, the access control application 212 of the node 201 may receive authentication for the user of the node 201 from the controller 202.

Referring to FIG. 7, in operation 705, node 201 may receive input for user authentication. The input for user authentication may be, for example, a user input of entering a user ID and password. For another example, the input for user authentication may be a user input for stronger authentication (e.g., biometric information).

For example, referring to FIG. 8 , when the access control application 212 is executed, the node 201 may display a user interface screen 810 for receiving information necessary for controller access. The user interface screen 810 includes an input window 811 for entering controller access information (e.g. IP or domain), an input window 812 for entering a user ID, and/or an input window for entering a password ( 813) may be included. After information is entered into the

input windows

811, 812, and 813, the node 201 can detect a controller connection event by receiving an input to the

button

814 or 815 for user authentication. For example, when controller access information, user ID, and password are entered, node 201 may receive an input for a button 815 to access the controller as a user. As another example, when only the controller access information is input and the user ID and password are not input, the node 201 may receive an input for a button 814 for accessing the controller as a guest.

In operation 710, node 201 may request user authentication from controller 202. For example, the access control application 212 sends input information for user authentication (e.g., controller access information, user ID, and/or password entered into the

input windows

811, 812, and 813 of FIG. 8) to the controller. It can be sent to (202). If a control flow between the node 201 and the controller 202 has already been created, the access control application 212 may transmit input information for user authentication along with control flow identification information.

At operation 715, controller 202 may authenticate the user based on information received from node 201. For example, the controller 202 may store user ID, password, and/or enhanced authentication information included in the received information and a database included in the memory of the controller 202 (e.g., access policy database 311 of FIG. 2 ). ) or based on the blacklist database 320), it is possible to determine whether the user can access according to the access policy and whether the user is included in the blacklist.

When the user is authenticated, the controller 202 checks the control flow information 340 in the control flow table 316 based on the control flow identification information transmitted by the node 201, and adds control flow information 340 to the confirmed control flow information 340. You can add the user's identifying information (e.g. user ID). The added user identification information can be used to connect the authenticated user to the controller or network.

As another example, if the controller 202 does not receive a user ID, password, and/or enhanced authentication information from the node 201, and only receives controller connection information, the controller 202 cannot authenticate the user; In connection with an unauthorized user's access to the controller or network access, an unidentified user (or, The access policy corresponding to the guest) may be applied.

In operation 720, the controller 202 may check the connection policy corresponding to the information identified in the connection policy database 311 (e.g., information about the node 201 and the source network to which the node 201 belongs). The controller 202 may generate white list information of accessible applications based on the confirmed access policy. The controller 202 can check the channel policy through the IP of the node 201 identified in the channel policy database 312. The controller 202 lists the channel types and gateways that the node 201 can connect to based on the confirmed channel policy, and checks the status (e.g., throughput and/or failure) of the listed gateways to list them. Among the gateways, one channel and gateway optimized for the node 201 can be identified. In another embodiment, controller 202 may not perform operation 720. For example, if the controller for which connection is requested is not available, the controller 202 may not perform operation 720.

At operation 725, the controller 202 may transmit a response to the user authentication request to the node 201. In one embodiment, the controller 202 may transmit information indicating that the user is authenticated to the node 201 in response to a user authentication request. In one embodiment, the controller 202 may transmit the white list created through operation 720 to the access control application 212. In one embodiment, the controller 202 may transmit information necessary to create a channel including the identified gateway and channel authentication information to the node 201 by performing operation 625. Depending on the embodiment, when connecting through a pre-connected channel between the node 201 and the gateway 203, or when connecting through another channel technology between the node 201 and the gateway 203, the controller 202 ) may not transmit separate channel creation information to the node 201. Depending on the embodiment, if the object requesting controller access is unable to access or is included in the blacklist, the controller 202 may notify the controller 202 of the inability to access the controller in response to the user authentication request.

In one embodiment, node 201 may process results for user authentication. For example, the node 201 may output a user interface screen indicating that user authentication has been completed to the user through a display.

According to another embodiment, the controller 202 may determine that user authentication is not possible. For example, if the user's identifying information is included in the blacklist database, the controller 202 may determine that user authentication is not possible. In this case, in operation 725, the controller 202 may transmit information indicating that user authentication is impossible to the node 201, and the node 201 may stop or end execution of the access control application 212 or perform user authentication. A user interface screen indicating this failure can be output through the display. For example, referring to FIG. 8 , the node 201 may display a user interface screen 820 through the access control application 212. The user interface screen 820 indicates that access to the node 201 is blocked and may include a user interface 825 that guides the release of isolation through an administrator (e.g., the controller 202).

Depending on the embodiment, the controller 202 may determine that channel creation is necessary. If channel creation is necessary, the controller 202 may transmit information for channel creation to the node 201. For example, when information for channel creation is received from the controller 202, the node 201 may perform a channel creation processing step. In operation 730, the node 201 may request the gateway 203 to create a channel. For example, the node 201 may request the gateway 203 to create a channel based on information for channel creation (eg, gateway and channel authentication information) received from the controller 202.

In one embodiment, the access control application 212, the controller 202, and the gateway 203 of the node 201 may further perform operations 730 to 755. Depending on the embodiment, the access control application 212, the controller 202, and the gateway 203 of the node 201 may perform all or part of operations 730 to 755.

At operation 735, access control application 212 may perform a check of the application. For example, when a white list is received from the controller 202, the access control application 212 may check whether an application included in the white list is installed on the node 201. For applications included in the white list among applications installed on the node 201, the access control application 212 checks the integrity and stability of the application (whether the application is forged or tampered with, code signing inspection, and fingerprint inspection) according to the validation policy. at least one of) can be checked.

In operation 740, the access control application 212 may transmit the application's inspection result to the controller 202.

The controller 202 may determine whether the application is valid based on the test result. If the application is valid, the controller 202 checks the gateway 203 where the node 201 is located in the access policy for the node 201 to allow the node 201 to access the network, and then performs operation 745. can do.

In operation 745, the controller 202 configures the source IP, destination IP, service port information, protocol information, and You can create a data flow that includes certificate information, domain, and URL information.

In operation 750, the controller 202 may transmit a response to the application check result transmission of the access control application 212. For example, the controller 202 may transmit data flow information 350 including file IO information 354 to the access control application 212. Additionally, in operation 755, the controller 202 may transmit data flow information 350 including file IO information 354 to the gateway 203.

FIG. 9 shows a signal flow diagram for network access according to various embodiments, and the operations shown in FIG. 9 may be implemented, for example, after the signal flow diagram of FIG. 6 or FIG. 7.

Referring to FIG. 9, in operation 905, node 201 may detect a network connection event. For example, the node 201 may detect that the target application attempts to connect to the service server 205 through the connection control application 212.

In one embodiment, connection control application 212 may inspect data flow when a network connection event is detected. For example, the access control application 212 may check whether a data flow corresponding to the identification information, destination IP, and/or port information of the target application exists. Additionally, the access control application 212 can check whether the data flow is valid even if the data flow exists. As an example, the access control application 212 performs an integrity and safety check (e.g., application forgery, tampering, code signing check, fingerprint check) of the access control application 212 and the target application according to the validation policy. And, according to the connection policy received from the controller 202, it is possible to check whether the destination IP and port of the target application installed on the node 201 are accessible.

If a valid data flow exists, the access control application 212 may skip the following operations and transmit the data packet of the target application to the gateway 203 through the channel.

If a data flow exists but is not valid, the access control application 212 may not transmit a data packet and output a user interface screen indicating that the network connection has failed.

If the data flow does not exist, the authentication time of the data flow has expired and needs to be renewed, or if the data flow needs to be updated for other reasons, the access control application 212 may request network access from the controller 202. there is. Depending on the embodiment, the access control application 212 performs an integrity and safety check of the access control application 212 and the target application according to a validation policy before requesting network access, and when the integrity and stability of the application are confirmed, the controller You can request network access from (202).

In operation 910, the access control application 212 may request network access to the service server 205 from the controller 202. In this case, the access control application 212 may transmit target application identification information and identification information of the service server 205 (eg, IP and service port) to the controller 202 along with identification information of the control flow.

At operation 915, the controller 202 may confirm the connection policy and channel policy associated with the target application in response to a request received from the connection control application 212.

The controller 202 may check whether the target application satisfies the access policy of the access policy database 311. For example, the controller 202 determines whether the entity requesting network access (e.g., target application) and the identification information of the requested entity (e.g., service server 205) are included in the connection policy database 311 and network connection. You can check whether the gateway request is available.

If connection to the target application is not possible, the controller 202 may transmit information indicating that connection is not possible to the node 201 in operation 920. In this case, the access control application 212 may output a user interface screen indicating that access is impossible through the display.

If the target application can be connected, the controller 202 can check whether a channel for connecting to the target (eg, service server 205) for which network connection has been requested has been created in the channel table 318. For example, if a channel has not been created, the controller 202 can check whether channel creation is necessary to access the service server 205 in the channel policy of the channel policy database 312. If channel creation is necessary, the controller 202 may transmit a result indicating network connection unavailability to the node 201. As another example, if a channel has been created or it is confirmed that channel creation is unnecessary in the channel policy, the controller 202 records the information (e.g., destination IP and service) that the node 201 requested for network connection in the data flow table 317. You can check whether a valid data flow corresponding to port information exists.

If a valid data flow exists, the controller 202 may transmit data flow information to the node 201. If a valid data flow does not exist, the controller 202 may create a data flow including source IP, destination IP, service port information, protocol information, certificate information, domain, and URL information.

In operation 920, the controller 202 may transmit a response to the network connection request of the access control application 212 to the node 201. For example, the controller 202 may transmit the data flow information 350 generated by performing operation 915 to the connection control application 212. Depending on the embodiment, if the object requesting connection is unable to connect, the controller 202 may notify the network connection inability in response to the network connection request.

Node 201 may process the result according to the received response. For example, the access control application 212 may store the received data flow information 350 and transmit the data packet of the target application when network access is available. For another example, when receiving a response that network connection is not possible, the node 201 may drop the data packet of the target application.

Additionally, in operation 925, the controller 202 may transmit data flow information 350 to the gateway 203.

In operation 1005, the proxy server 231 may detect a service processing request event. For example, the proxy server 231 may confirm that a service processing request event has occurred when the target application (or its process) requests service processing from the service server 205.

The proxy server 231 can check whether a data flow corresponding to the source IP or certificate identification information, destination IP or domain and port information, and/or protocol information included in the service processing request information received from the target application exists. there is. If a data flow exists, the proxy server 231 may perform the following operations.

In operation 1010, the proxy server 231 may check whether file information is included in the service processing request information. If file information is not included, the proxy server 231 may forward the service processing request to the service server 205. If file information is included, the proxy server 231 may perform operation 1015.

In operation 1015, proxy server 231 may check whether the file is encrypted. The proxy server 231 can check whether encryption is required when transmitting a file from the file IO information 354 included in the data flow information 350. If encryption is required when transmitting a file, for example, the proxy server 231 can check whether encryption is necessary based on the file extension. The proxy server 231 may check in the file IO information 354 whether the extension of the file information included in the service processing request information is an extension that requires encryption when transmitting the file.

If encryption is not required when transmitting a file, the proxy server 231 may forward the service processing request to the service server 205. If encryption is required when transmitting a file, the proxy server 231 may extract unique information and identification information of the file (e.g., file name, partial contents of the file or header information, hash information, and/or signature information). The proxy server 231 may check whether encrypted file information corresponding to the extracted unique information and identification information exists in the file table 319 stored in the memory of the gateway 203.

If file information exists in the file table 319, the target file has already been encrypted, so the proxy server 231 can forward the service processing request to the service server 205. If there is no file information in the file table 319, whether to generate the encryption key in the gateway 203 or the controller 202 is determined according to the encryption and decryption information 355 included in the data flow information 350. You can check it. For example, when the gateway 203 generates an encryption key, the gateway 203 may generate an encryption key based on the encryption and decryption information 355 and encrypt the file using the generated encryption key. The gateway 203 may forward the service processing request after encrypting the file. As another example, when the controller 202 generates an encryption key, the gateway 203 may perform operation 1020.

In operation 1020, the gateway 203 may request file encryption information from the controller 202, including file identification information. File identification information may include unique information and identification information of the file (e.g., file name, partial contents of the file or header information, hash information, and/or signature information). The gateway 203 may transmit data flow identification information or inspection target identification information along with file identification information.

At operation 1025, controller 202 may generate file encryption information. The controller 202 identifies the data flow based on the data flow identification information or the inspection target identification information received from the gateway 203, and selects the target in the file table 319 based on the file identification information received from the gateway 203. You can check whether the file information of the file (or the file corresponding to the file identification information) exists.

If file information of the target file exists in the file table 319, since the target file is already an encrypted file, the controller 202 may transmit information indicating that encryption is not necessary to the gateway 203. If the file information of the target file does not exist in the file table 319, the controller 202 generates an encryption key according to the file IO policy of the file IO policy database 314, and includes the file information of the target file to be encrypted, The data flow information 350 and file table information 360 can be updated by adding encryption and decryption information including encryption or decryption keys and algorithms to the data flow and file tables.

At operation 1030, the controller 202 may transmit a response to the request for file encryption information. For example, if the file is already encrypted, the controller 202 may transmit information indicating that encryption is not necessary to the gateway 203. As another example, if the file is not encrypted, the controller 202 may generate encryption information (eg, an encryption key and an encryption algorithm) and transmit the generated encryption information to the gateway 203.

In operation 1035, the proxy server 231 may perform file encryption processing. For example, the proxy server 231 may encrypt the target file based on the encryption information received from the encryption information controller 202 generated by the gateway 203. The proxy server 231 extracts identification information (e.g., file name, partial contents of the file or header information, hash information, and/or signature information) of the encrypted file and updates the file table information 360 of the gateway 202. can do.

In operation 1040, the proxy server 231 may forward a service processing request. For example, the proxy server 231 may forward a service processing request when encryption of a file is unnecessary (e.g., a file that has already been encrypted). As another example, the proxy server 231 may forward a service processing request after encrypting a file based on encryption information generated by the gateway 203 or encryption information received from the controller 202.

In operation 1045, the proxy server 231 may transmit the file encryption processing result to the controller 202. For example, proxy server 231 may transmit file identification information, encryption information including an encryption key generated by gateway 203, and encrypted file information to controller 202.

At operation 1050, controller 202 may update the file table. The controller 202 may identify a data flow based on data flow identification information or inspection target information received from the gateway 203 and update the file table based on the received file identification information. The controller 202 may update the file table information 360 based on the encryption information and encrypted file information received from the gateway 202, and then use the updated file table information 360 when decrypting the target file. You can.

Figure 11 shows a signal flow diagram for receiving a service processing request result according to various embodiments. The operations shown in FIG. 11 may be implemented, for example, after the signal flow diagram of FIG. 10.

In operation 1105, the proxy server 231 may detect a reception event resulting from a service processing request. For example, when the proxy server 231 receives a result of a service processing request according to the process of FIG. 10, it may confirm that a service processing request result reception event has occurred. When receiving a result of a service processing request according to the process of FIG. 10, the proxy server 231 may perform a check on whether or not the file is encrypted on the service processing request result information based on a pre-identified data flow.

In operation 1110, the proxy server 231 may check whether file information is included in the service processing request result information. If file information is not included, the proxy server 231 may forward the service processing request result to the node 201. If file information is included, the proxy server 231 may perform operation 1115.

In operation 1115, proxy server 231 may check whether the file is encrypted. The proxy server 231 extracts the unique information and identification information of the file (e.g., file name, partial contents of the file or header information, hash information, and/or signature information), and configures the gateway 203 based on the extracted information. You can check whether encrypted file information exists in the file table 319. For example, if encrypted file information exists, the proxy server 231 decrypts the target file using the encryption or decryption key and algorithm included in the encryption/decryption information 366 and forwards the service processing request result. You can. As another example, when encrypted file information does not exist, the proxy server 231 may perform operation 1120.

In operation 1120, the proxy server 231 may request file decryption information from the controller 202, including file identification information. File identification information may include unique information and identification information of the file (e.g., file name, partial contents of the file or header information, hash information, and/or signature information). The gateway 203 may transmit data flow identification information or inspection target identification information along with file identification information.

At operation 1125, controller 202 may check file decryption information. The controller 202 identifies the data flow based on the data flow identification information or the inspection target identification information received from the gateway 203, and selects the target in the file table 319 based on the file identification information received from the gateway 203. You can check whether the file information of the file (or the file corresponding to the file identification information) exists.

If file information of the target file exists in the file table 319, the target file is an encrypted file, and the controller 202 can transmit the decryption algorithm and decryption key information required for decryption to the gateway 203. If file information of the target file does not exist in the file table 319, since the target file is not an encrypted file, information indicating that decryption is not necessary may be transmitted to the gateway 203.

At operation 1130, the controller 202 may transmit a response to the request for file decryption information. For example, if the file is encrypted, the controller 202 may transmit decryption information (e.g., decryption algorithm and decryption key) to the gateway 203. As another example, if the file is not encrypted, the controller 202 may transmit information indicating that decryption is not necessary to the gateway 203.

In operation 1135, the proxy server 231 may perform file decryption processing. For example, when decryption information is received from the controller 202, the proxy server 231 may decrypt the target file based on the received decryption information.

In operation 1140, the proxy server 231 may forward a service processing request. For example, the proxy server 231 may forward the service processing request result when encryption of the file is unnecessary (e.g., if the file is not an encrypted file). As another example, the proxy server 231 decrypts the file based on the encryption and decryption information 366 included in the file table information 360 of the gateway 203 or based on the decryption information received from the controller 202. The service processing request results can be forwarded to .

In operation 1205, the proxy server 231 may transmit a service request processing log and a rejection log to the controller 202. The proxy server 231 may transmit service request processing logs and rejection logs to the controller 202 in designated time units. For example, the service request may include a service processing request for the service server 205 of the node 201.

At operation 1210, the controller 202 may analyze the log received from the gateway 203. The controller 202 may update statistical information on service requests and rejections based on the received log information. The controller 202 may analyze the received log to check whether the object requesting the service (e.g., the node 201 or the target application 211 of the node 201) is performing abnormal behavior. For example, if the object requesting the service is performing abnormal behavior, the controller 202 may register it in the blacklist 320 according to the blacklist policy of the blacklist policy database 315. Additionally, the controller can block service access of a target performing abnormal behavior by removing the target's data flow and control flow. The controller 202 may return updated data flow information to the gateway 203.

In operation 1215, the controller 202 may transmit the update result of the data flow to the gateway 203. When the gateway 203 needs to remove a data flow according to the received data flow information, it removes the data flow of the target performing abnormal behavior from the data flow table 317 so that the target can no longer perform service access requests. You can make it so that you can't do it.

Referring to FIG. 13, at operation 1305, the access control application 212 may request a control flow update.

In one embodiment, the access control application 212 may request a control flow update from the controller 202 to maintain the control flow and data flow. In one embodiment, the access control application 212 may request a control flow update including identification information of the control flow at specified intervals.

At operation 1310, controller 202 may update (check) the control flow. For example, the controller 202 determines whether the control flow information 340 indicated by the received identification information exists in the control flow table 316, and if the control flow information 340 exists, the data flow information 350 dependent thereon. You can check whether exists. If the connection is released by another security system, the update time has elapsed, or the connection is released due to risk detection, the control flow may not exist. If a control flow does not exist, the controller 202 may return unreachable information to the node 201. If a control flow exists, the controller 202 may update the update time or expiration time of the control flow and search for data flows dependent on the control flow. For example, if re-authentication must be performed in the discovered data flow or if there is a data flow that is no longer accessible, the controller 202 may return the corresponding data flow information to the node 201.

For example, if an update (check) fails, the controller 202 may transmit unconnectable information to the node 201. In this case, the node 201 may terminate the access control application 212 or block the network connection of the access control application 212. For another example, if the update (check) is successful, the controller 202 may update the expiration time of the control flow and the data flow dependent thereon. The controller 202 may transmit updated control flow information and data flow information to the node 201. In this case, the node 201 may update the control flow information 340 and data flow information 350.

In operation 1315, the controller 202 may transmit update (check) result information to the access control application 212. For example, if an update (check) fails, the controller 202 may transmit no-connection information. For another example, if the update (check) is successful, the controller 202 may transmit the updated control flow information 340 and data flow information 350 dependent thereon to the connection control application 212. In this case, the node 201 may update the control flow information 340 and data flow information 350.

The access control application 212 may process update (check) result information. If the control flow update result indicates that connection is not possible, the access control application 212 may terminate the target application or block all network connections of the target application. If the control flow update result indicates normal and there is updated data flow information 350, the connection control application 212 may update the data flow table 316 in the connection control application 212.

Referring to FIG. 14, in operation 1405, the node 201 may request the controller 202 to terminate the control flow. For example, node 201 may terminate the connection control application 212, request termination of the control flow when the network connection is unused for a specified period of time, or when a connection termination request is received from another system.

At operation 1410, the controller 202 may remove the control flow corresponding to the identification information received from the node 201. The controller 202 may also remove data flows dependent on the removed control flow.

In operation 1415, the controller 202 requests the gateway 203 to remove the data flow, and in operation 1420, the gateway 203 may block the network connection of the access control application 212 by removing the data flow.

Referring to FIG. 15, in operation 1505, the access control application 212 may detect termination of the target application. The access control application 212 can monitor in real time whether the target application running on the node 201 is terminated.

In operation 1510, the access control application 212 may request the controller 202 to terminate the data flow. For example, the access control application 212 may request termination of the data flow by transmitting data flow identification information assigned to the terminated target application or identification information of the target application to the controller 202.

In operation 1515, the controller 202 may remove the data flow based on the data flow identification information received from the node 201 or the identification information of the target application. The controller 202 may identify and search a control flow based on the received data flow identification information or the identification information of the target application, and remove the data flow tied to the identified and searched control flow.

In operation 1520, the controller 202 requests the gateway 203 to remove the data flow, and in operation 1525, the gateway 203 removes the data flow and thereby removes the service corresponding to the removed data flow of the access control application 212. Access to the server 205 can be blocked. The target application will no longer be able to transmit data packets to the destination network.

The above description is merely an illustrative explanation of the technical idea disclosed in this document, and those skilled in the art in the technical field to which the embodiments disclosed in this document belong will understand without departing from the essential characteristics of the embodiments disclosed in this document. Various modifications and variations will be possible.

Accordingly, the embodiments disclosed in this document are not intended to limit the technical ideas disclosed in this document, but rather to explain them, and the scope of the technical ideas disclosed in this document is not limited by these embodiments. The scope of protection of the technical ideas disclosed in this document shall be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope shall be interpreted as being included in the scope of rights of this document.

Claims

In the gateway,

communication circuit;

a processor operatively connected to the communication circuit; and

a memory operatively connected to the processor and storing a proxy server, wherein the memory, when executed by the processor, causes the gateway to:

Receive a data flow containing file IO (input output) information indicating whether encryption is required when sending a file from the node or whether decryption is required when receiving a file from an external server,

A gateway that stores instructions for processing the service processing request or the service processing request result of the node based on whether the service processing request or the service processing request result of the node includes file information through the proxy server.
The method of claim 1, wherein the commands allow the gateway to:

If the file information is not included in the service processing request, forwarding the service processing request,

When the file information is included in the service processing request, the gateway checks whether encryption is necessary when transmitting the file from the file IO information.
The method of claim 2, wherein the memory further stores a file table for managing file encryption or decryption,

The commands allow the gateway to:

When encryption is required when transmitting a file according to the file IO information, the gateway checks whether the file information exists in the file table based on file identification information for identifying the target file.
The method of claim 3, wherein the commands allow the gateway to:

If the file information exists, forward the service processing request,

When the file information does not exist, the gateway determines whether to generate an encryption key in the gateway or in the external server according to the encryption information of the data flow.
The method of claim 4, wherein the commands allow the gateway to:

When the encryption key is generated by the gateway, the encryption key is generated according to the encryption information, the target file is encrypted using the encryption key, and the service processing request is forwarded,

A gateway that transmits the file identification information, encryption information including the encryption key, and encrypted file information to the external server.
The method of claim 4, wherein the commands allow the gateway to:

When the encryption key is generated by the external server, a request for file encryption information including the file identification information is transmitted to the external server,

When receiving encryption information about the target file from the external server, encrypt the target file based on the encryption information and forward the service processing request,

A gateway that forwards the service processing request when information indicating that encryption of the target file is unnecessary is received from the external server.
The method of claim 1, wherein the commands allow the gateway to:

If the file information is not included in the service processing request result, forwarding the service processing request result,

A gateway that checks whether the file is encrypted when the file information is included in the service processing request result.
The method of claim 7, wherein the memory further stores a file table for managing file encryption or decryption,

The commands allow the gateway to:

If the file information is included in the service processing request result, check whether the file information exists in the file table,

If the file information exists, the gateway decrypts the target file using the decryption key and decryption algorithm included in the file table and forwards the service processing request result.
The method of claim 8, wherein the commands allow the gateway to:

If the file information does not exist, transmitting a file decryption information request including file identification information for identifying the target file to the external server,

When receiving decryption information about the target file from the external server, decrypt the target file based on the decryption information and forward the service processing request result,

A gateway that forwards the service processing request result when information indicating that decryption of the target file is unnecessary is received from the external server.
In claim 1,

The data flow includes at least one of source network information for identifying the node, network information of a service server, or certificate identification information.
The method of claim 1, wherein the commands allow the gateway to:

A gateway that creates the channel based on channel creation information for creating a channel between the node and the gateway received from the node.
On the server,

communication circuit;

a processor operatively connected to the communication circuit; and

a memory operatively connected to the processor and storing a database, wherein the memory, when executed by the processor, causes the server to:

Receiving a network connection request including identification information of a target application of the node that wants to connect to the network of the service server and network information of the service server from the node's connection control application,

Check whether the target application can connect to the service server based on the database,

If connection is possible, the node generates a data flow that corresponds to the network information of the service server and includes file IO (input output) information indicating whether encryption is required when transmitting a file from the node or whether decryption is required when receiving the file. and transmit to the gateway,

A server that stores commands to transmit result information indicating inability to connect to the node when connection is not possible.
The method of claim 12, wherein the commands allow the server to:

Transmitting a whitelist of applications that can be accessed to the access control application,

Confirm whether the application is valid based on the inspection result of the application received from the access control application,

If the application is valid, check the gateway where the node is located,

A data flow containing at least one of source network information, network information of the service server, or certificate identification information is generated and transmitted to the node and the gateway, and the data flow requires approval for file transmission and reception of the application. Server, including file IO (input output) information indicating whether the server
The method of claim 12, wherein the commands allow the server to:

Receive a network connection request from the access control application, wherein the network connection request includes identification information of the access control application,

Check whether the access control application can connect to the controller based on the database,

A server configured to generate a control flow between the connection control application and the server when a connection is available.
The method of claim 14, wherein the commands allow the server to:

After creation of the control flow, a user authentication request is received from an access control application, wherein the user authentication request includes a user ID, password and/or enhanced authentication information,

Verify whether the user can access based on the information included in the user authentication request,

If the user is accessible, the server adds the user's identification information to the control flow.
The method of claim 12, wherein the commands allow the server to:

When you create a control flow or complete user authentication,

Identifying channels and gateways connectable to the access control application based on the database,

A server that causes the node to transmit information for creating the identified gateway and the identified channel to the node.
The method of claim 12, wherein the commands allow the server to:

Receiving an encryption information request or a decryption information request for a target file from the gateway, the encryption information request or the decryption information request includes file identification information for identifying the target file,

Check whether file table information for the target file exists in the database based on the file identification information,

A server configured to transmit encryption information or decryption information of the target file to the gateway based on the file table information.
The method of claim 17, wherein the commands allow the server to:

In response to the encryption information request,

If file table information for the target file exists, information indicating that encryption for the target file is unnecessary is transmitted to the gateway,

When file table information for the target file does not exist, the server generates an encryption key based on the database and transmits encryption information including the encryption key and encryption algorithm to the gateway.
The method of claim 17, wherein the commands allow the server to:

In response to the decryption information request,

If file table information for the target file exists, transmitting the decryption algorithm and decryption key information included in the file table information to the gateway,

When file table information for the target file does not exist, the server transmits information indicating that decryption of the target file is unnecessary to the gateway.
The method of claim 12, wherein the commands allow the server to:

Receiving file identification information for identifying a target file, encryption information including an encryption key and an encryption algorithm for encrypting the target file, and encrypted file information from the gateway,

A server configured to update file table information of the database based on the received file identification information, the encryption information, and the encrypted file information.
In the method of operating the gateway,

An operation of receiving a data flow including file IO (input output) information indicating whether encryption is required when transmitting a file of a node from an external server or whether decryption is required when receiving a file, and

An operation method comprising processing the service processing request or the service processing request result of the node based on whether file information is included in the service processing request or the service processing request result of the node, through the proxy server of the gateway.
In the operating method of the server,

An operation of receiving a network connection request including identification information of a target application of the node trying to connect to the network of a service server and network information of the service server from a connection control application of the node;

An operation of checking whether the target application can connect to the service server based on the database of the server, and

Generates a data flow that corresponds to the network information of the service server and includes file IO (input output) information indicating whether encryption is necessary when transmitting a file from the node or whether decryption is required when receiving a file, and transmits it to the node and gateway. A method of operation, including an operation.