CN112104516B - Method for realizing OPCUA protocol support simulation system - Google Patents
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- H—ELECTRICITY
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- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
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- H04L41/0246—Exchanging or transporting network management information using the Internet; Embedding network management web servers in network elements; Web-services-based protocols
- H04L41/0273—Exchanging or transporting network management information using the Internet; Embedding network management web servers in network elements; Web-services-based protocols using web services for network management, e.g. simple object access protocol [SOAP]
- H04L41/028—Exchanging or transporting network management information using the Internet; Embedding network management web servers in network elements; Web-services-based protocols using web services for network management, e.g. simple object access protocol [SOAP] for synchronisation between service call and response
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Abstract
The invention discloses a method for realizing an OPCUA protocol supporting a pseudo-state system, which comprises the steps of synchronously normalizing output messages and quickly starting an OPCUA application on the pseudo-state system. And each executive body of the mimicry system runs an OPCUA process, and the mimicry system is a single system for external presentation. In order to ensure that the OPCUA processes on multiple execution bodies can normally run, it is necessary to ensure that the OPCUA processes on the respective execution bodies can synchronously run and output consistent content. The invention guarantees the output synchronization by sending the output agent control message; all resources are managed uniformly through a resource management module, and the OPCUA process on all running executors applies for the resources from the resource management module to solve the problem of normalization; the state of the current OPCUA operation and the configuration information required by the interaction are stored in the OPCUA state synchronization module, and the OPCUA process on the execution body can read the operation state and the configuration information to realize quick start.
Description
Technical Field
The invention belongs to the field of network communication, and particularly relates to a method for realizing an OPCUA protocol supported simulation system.
Background
While the network space is developed vigorously, the network space is facing a severe security situation, a large number of malicious attack events aiming at the network space exist, in addition, the network system is complex, and inevitable holes exist, so that the network space not only comes from external threats, but also is interwoven with the internal security hole problem, and the security risk is severe and complex. Under a new network space security situation, the traditional defense means based on prior knowledge is difficult to deal with various attacks, the defense thought needs to be changed, a new defense boundary is defined, the depth of a defense line is consolidated, and active defense from passive to endogenous security is developed.
Chinese patent CN201610853938.7, "a device, method and apparatus for encapsulating isomerous functional equivalents," proposes a mimicry security defense technique, which can obtain favorable internal defense situation from the initiative, variability and randomness, and makes dynamic change through the mimicry environment, so as to make it difficult to observe and predict the attacker, thereby greatly increasing the attack difficulty and cost including unknown available bugs and backdoors. The main principle is as shown in figure 1, after receiving an external service request, an input agent sends the external service request to one or more selected heterogeneous functional equivalents according to an agent strategy of a redundancy controller; the heterogeneous function equivalent works and runs after receiving the service request, outputs a service response and sends the service response to the output agent, and sends the mimicry arbitration parameter to the redundancy controller; and after receiving the service response, the output agent selects the output of one of the heterogeneous functional equivalents as an external service response to be sent according to the output arbitration strategy of the redundancy controller. Due to the asynchrony of the opua (ole) protocol Process and the differences of random numbers, timestamps, etc. of different systems in the interactive flow, the opua protocol cannot normally run on the mimicry system as shown in fig. 1.
The chinese patent CN201610853938.7 solves the problem of security protection of network elements well, but at present, the network functions are more and more complex, and the types of security attacks are more and more, for example, in network edge calculation, the network elements not only have network transmission functions, but also have storage and calculation functions, data stored by the network elements usually exceed G bytes or even T bytes, and the calculation functions are complex, and if the mimicry arbitration function of the chinese patent CN201610853938.7 is still adopted, it is difficult to meet the actual requirements of the network in terms of timeliness and arbitration accuracy.
The problem of TCP normalization is well solved by chinese patent CN202010521038.9, but because different applications have large differences, there is a problem that normalization is required due to timestamp, incremental sequence number, channel ID, etc. and meanwhile, when an application is abnormally restarted, there is a need to keep synchronization with application processes in other executors after restart.
Disclosure of Invention
The invention aims to provide a method for realizing an OPCUA protocol supported simulation system aiming at the defects of the prior art.
The purpose of the invention is realized by the following technical scheme: a method for realizing OPCUA protocol support simulation system comprises a resource management module, an output agent module and an OPCUA state synchronization module; different resource tables are created in a resource management module, and resources are managed uniformly, so that the same relevant resources are obtained by the OPCUA processes running on different executives; the OPCUA state synchronization module stores configuration information corresponding to the current state of all OPCUA processes according to different states of the OPCUA processes, and realizes quick start of the OPCUA process of a new execution body; the output agent module enables the OPCUA process output of each execution body to be synchronous through controlling message output.
Further, in the resource management module, resource data are stored in different tables, different tables represent different resource types, and the content in the tables consists of table names, indexes and values; the index is a key value for inquiring the resource, and is obtained by Hash calculation through quintuple and self protocol information; the value is the data information portion of the resource.
Further, the resource table includes a random number storage table, a current time storage table, a source port number storage table, and an increment sequence storage table.
Further, the five-tuple includes a source port number, a destination port number, a source IP, a destination IP, and a protocol type.
Further, the resource management module is used for resource application and release, and specifically includes:
the OPCUA process of the executive body sends a resource application request to the resource management module, and the resource management module sets the executive body and judges whether all the executive bodies are set or not; if yes, returning directly if the resource exists, and if not, returning after creation;
when the OPCUA process of the executive body exits or the executive body exits, the executive body sends a resource release request to the resource management module, and the resource management module sets the executive body and judges whether all the running executive bodies are set or not; if yes, releasing the corresponding resource.
Further, the OPCUA state synchronization module is configured to store the current state and configuration information of OPCUA, and interact with the new online OPCUA process to enable the new online OPCUA process to run to the same state as other OPCUA processes.
Further, the workflow of the OPCUA state synchronization module includes the following steps:
(1) after starting the OPCUA process of the executive body, sending a message to an OPCUA state synchronization module;
(2) the OPCUA state synchronization module firstly inquires whether a saved state exists; if yes, judging whether the OPCUA process of the executive body is synchronous with the saved state or not according to the index corresponding to the message, if not, executing the step (3), and if so, executing the step (4); if the saved state does not exist, executing the step (4);
(3) the OPCUA state synchronization module and the execution body OPCUA process finish initialization of configuration information through interaction until the saved states of the execution body OPCUA process and the OPCUA state synchronization module are synchronized; the OPCUA state synchronization module quits the interaction with the execution body OPCUA process; continuing to execute the step (4);
(4) the method comprises the steps that an executive OPCUA process sends messages to an output proxy module, and after the output proxy module judges that the messages of all executive OPCUA processes are output, the output proxy module firstly informs an OPCUA state synchronization module to extract configuration information corresponding to the states of all current OPCUA processes and updates the stored states; if the final state is reached, not extracting information and updating the state; and finally, the output agent module outputs the message.
Further, the final state refers to an active session state.
Further, the state of the opuua process includes establishing a TCP connection, HELLO interaction, establishing a secure channel, acquiring endpoint, establishing a session, and activating a session.
The invention has the beneficial effects that: the method for supporting the pseudo-state system by the OPCUA protocol realizes synchronization and normalization of output messages and quick start of the OPCUA application on the pseudo-state system. Ensuring output synchronization by sending control messages at the output agent; all resources are managed uniformly through a resource management module, and OPCUA processes on all running executors apply for the resources from the resource management module to solve the problem of normalization; the state of the current OPCUA operation and the configuration information required by the interaction are stored in the OPCUA state synchronization module, and the OPCUA process on the execution body can read the operation state and the configuration information to realize quick start. The invention deploys the OPCUA protocol to the mimicry system, and can be expanded to the solution of supporting the mimicry system by other application programs.
Drawings
FIG. 1 is a schematic diagram of the operation principle of a mimicry system;
FIG. 2 is a schematic diagram of the phase division of the OPCUA application of the method of the present invention;
FIG. 3 is a schematic view of the resource management module workflow of the method of the present invention;
FIG. 4 is a schematic diagram of the OPCUA export proxy module of the method of the present invention;
FIG. 5 is a schematic diagram of an OPCUA state synchronization module of the method of the present invention;
fig. 6 is a schematic view of the overall embodiment of the present invention.
Detailed Description
The invention relates to a method for realizing an OPCUA protocol support simulation system, which mainly comprises a uniform resource management module, an OPCUA state synchronization module and an OPCUA output agent module. The OPCUA protocol is applied in the form of an OPCUA process in a mimicry system.
As shown in fig. 2, the OPCUA process includes six states of establishing a TCP connection, HELLO interaction, establishing a secure channel, acquiring endpoint, establishing a session, and activating the session, where each state corresponds to different configuration information. The configuration information corresponding to the TCP connection state is established mainly comprises TCP three-way handshake information, such as the size of a sliding window, a random number and the like; the configuration information corresponding to the HELLO interaction state mainly comprises values of the sizes of interaction sending and receiving data caches; the configuration information corresponding to the established safe channel state mainly comprises the configuration information of the safe channel, such as a safe algorithm, TokenID, safe channel ID information and the like; acquiring configuration information corresponding to an endpoint state, wherein the configuration information mainly comprises an endpoint supported by an OPCUA process and configuration information required for establishing a secure channel, such as encryption mode configuration information and the like; the configuration information corresponding to the session establishment state includes configuration information for establishing a session by the OPCUA, such as Sessionld, authitiontontoken, and the like; the configuration information corresponding to the activation session state contains information required by the opuua process (client) to activate the session, such as a signature generated by a private key associated with the client certificate.
The resource management module is used for uniformly managing all resources and solving the problems of normalization of the OPCUA process and key node synchronization in different executors of the mimicry system.
As shown in fig. 3, the resource management module includes two parts, agent and resource management; wherein, the agent part is used for resource application or release request session; the resource data in the resource management part is stored in the form of tables, and each table represents a resource type, such as a random number storage table, a current time storage table, a source port number storage table, an increment sequence storage table and the like; the contents of the resource data consist of a table name, an index, and a value. Different indexes represent different states of the OPCUA process; the index is obtained by Hash calculation through quintuple and self protocol information; the five-tuple includes a source port number, a destination port number, a source IP, a destination IP, and a protocol type.
When the agent part receives a resource application or a release request sent by an executive OPCUA process, firstly, an index is created according to a request attribute; the request attribute comprises a quintuple of common TCP connection, a secure channel ID of the OPCUA and the like; then setting an execution body corresponding to the index; finally, the agent part judges whether all the running executors are set; if the execution body which is not set exists, continuing to wait for the OPCUA process on other execution bodies to send the request; if all the running executives have been set, the agent part sends a resource application or release request to the resource management part.
After receiving the resource application request, the resource management part judges whether the resource exists according to the index; if not, the resource is created, and the resource value and the index thereof are returned to the agent part; if so, the resource value is returned directly to the proxy portion. The proxy component distributes the acquired resource values to the OPCUA processes on all running executives. When the OPCUA process of the executive body exits or the executive body exits, the executive body applies for releasing resources to the resource management module; and after receiving the resource release request, the resource management part finds the corresponding resource according to the index and releases the resource.
In the mimicry system, the OPCUA process in each executive body can cause the problem of inconsistent running speed due to the difference of the hardware architecture and software of the executive body; the resource management module can ensure that the information acquired by all executors is consistent, and can ensure the synchronization of key nodes and execution flows in the OPCUA process and the normalization of the key information in the OPCUA process. For example, when the OPCUA message applies for the current time, the current time acquired by the OPCUA in all the executors can be guaranteed to be consistent by acquiring the current time in the resource management module.
As shown in fig. 4, the output proxy module mainly completes synchronous output of the OPCUA message. When an output agent module receives an OPCUA message output by an executive body, firstly, an index is created according to the characteristics of the message, then bit information of the executive body corresponding to the index is set, and finally, the output agent module judges whether all the executive bodies currently running are set; and if all the messages are set, outputting the messages, and otherwise, continuously waiting for other execution bodies OPCUA processes to output the messages.
Because the mimicry system is presented as a single execution unit, the output agent module only outputs one message after receiving all the operating executive OPCUA process messages; the synchronization of the output flow of each executive can be ensured through the output agent module.
In the mimicry system, an executive body is cleaned to be taken off a line after being attacked from the outside, a new executive body is taken on the line at the same time, an OPCUA process in the new on-line executive body cannot normally work because the OPCUA process is asynchronous with the OPCUA processes in other normally-running executive bodies, and if the new on-line executive body is also taken as a running executive body in an output agent module, the OPCUA messages of other executive bodies cannot be output because the new on-line executive body cannot output messages consistent with the other executive bodies, so that the OPCUA messages of other executive bodies cannot normally work. And if the newly online executive body participates in output judgment, ensuring that the OPCUA processes on all the executive bodies run synchronously.
The OPCUA state synchronization module is used for solving the problem of quick starting of the OPCUA process of the new online executive body; the OPCUA process of the new online executive body completes the initial stage interaction with the OPCUA state synchronization module, and can be quickly synchronized with the state of the OPCUA process on the running executive body.
Specifically, the workflow of the OPCUA state synchronization module, as shown in fig. 5, includes the following steps:
(1) after starting the OPCUA process of the executive body, sending an OPCUA message to an OPCUA state synchronization module;
(2) after receiving the OPCUA message of the executive body, the OPCUA state synchronization module judges whether a stored state exists or not; if the OPCUA state of the executive body is different from the stored state, the executive body is a new on-line executive body, and the step (3) is executed; if the states exist and are the same, executing the step (4); if the fact that all execution bodies are newly online does not exist, executing the step (4);
(3) the OPCUA state synchronization module reads the configuration information corresponding to the saved state, and interacts with the OPCUA process of the execution body until the OPCUA process of the execution body runs to the saved state of the OPCUA state synchronization module; all resources of the OPCUA process of the executive body in the interactive process are acquired from the resource management module through indexes, and related resources at the stage are already applied by other running executive bodies and exist;
(4) at the moment, all the OPCUA processes of the execution bodies run synchronously, and all OPCUA messages of the execution bodies are output to the output agent module; when the output agent module receives all the executive OPCUA messages, the output agent module firstly informs the OPCUA state synchronization module to extract the configuration information corresponding to all the current OPCUA states and establishes corresponding index updating and saving states; if the final state is reached, not extracting information and updating the state; and finally, the output agent module outputs the message.
The technical solution is further described in detail with reference to the following examples.
The overall flow of the OPCUA process running on the mimicry system is shown in fig. 6: an external OPCUA process input message is distributed to the running executors 1, 2 and 3 through an input agent; the three executors receive the message and then analyze and process the message to construct a response message, and information such as random numbers, timestamps and the like in the response message is acquired from the resource management module. Sending the response message to an output agent module, calculating an index by the output agent module according to the message related information, and juxtaposing a mark bit of a corresponding execution body; when all the operating execution bodies are set, the OPCUA state synchronization module is firstly informed, the OPCUA state synchronization module acquires the configuration information corresponding to the current state, and then the output proxy module outputs the OPCUA message.
After the executor 3 is cleaned and is taken off the line, then the executor 4 is taken on the line, the OPCUA process of the executor 4 will interact with the OPCUA state synchronization module after being started, and the interaction flow is specifically as follows: after a new executive 4 is online, when an OPCUA process on the executive 4 establishes TCP connection, an OPCUA message firstly enters an OPCUA state synchronization module, and an index corresponding to the current state can be calculated; then judging whether a stored state exists in the OPCUA state synchronization module; and if the OPCUA of the executive body 4 is the same as the saved state, judging whether the OPCUA of the executive body 4 is the same as the saved state according to the index, and if the OPCUA of the executive body 4 is not the same as the saved state, interacting with the OPCUA process of the executive body 4 according to the configuration information corresponding to the saved state by the OPCUA state synchronization module until the OPCUA process of the executive body 4 runs to the saved state of the OPCUA state synchronization module. When the OPCUA process state of the executive body 4 is switched to the state saved by the OPCUA state synchronization module, the OPCUA state synchronization module exits the interaction with the OPCUA process in the executive body 4; the opuca message of the executor 4 is output to the output agent module, and the normal flow is started.
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