CN111563744A - Method for verifying Fabric complex endorsement policy in cross-chain - Google Patents
Method for verifying Fabric complex endorsement policy in cross-chain Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
- H04L9/3247—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving digital signatures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
- H04L63/101—Access control lists [ACL]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/50—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using hash chains, e.g. blockchains or hash trees
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Abstract
The invention discloses a method for verifying a Fabric complex endorsement policy in a cross-chain, wherein in the method, a Fabric block chain registers an MSP list, a chain code ID and an endorsement policy description in a cross-chain network at first, transmits a generated cross-chain transaction to a relay chain, then the relay chain analyzes a transaction execution result and an endorsement node signature set to generate an endorsement policy interpreter, confirms that the transaction execution result is consistent with the chain code ID registered in the cross-chain network, and fails verification if the transaction execution result is inconsistent with the chain code ID registered in the cross-chain network, and finally verifies the signature set by the endorsement policy interpreter. The invention can verify the user-defined complex endorsement strategy; the method is user-friendly to the Fabric network, and only the endorsement policy description needs to be submitted without compiling the verification policy by the user; the malicious attack of the user through different chain codes can be prevented.
Description
Technical Field
The invention belongs to the technical field of block chains, and particularly relates to a method for verifying a Fabric complex endorsement strategy in a cross-chain mode.
Background
The cross-chain technology refers to the realization of cross-chain interoperation of the account book by connecting relatively independent block chain systems. In terms of asset exchange, some block chains are still isolated from each other, so that the barriers to intercommunication between the block chain applications are very high, and the verification of the transaction in asset exchange is a very great challenge.
Verification of cross-chain transactions generated by a Fabric blockchain is particularly difficult, the Fabric blockchain has a specified endorsement node for endorsement of the transactions, the Fabric endorsement node is a set consisting of a plurality of nodes, and a user can make a customized endorsement policy for the set, such as specifying which nodes endorsement or some endorsement in the nodes is required. For example, endorsement nodes a, B, C and D exist in the Fabric blockchain, and the user may define that two nodes a and B must be endorsed successfully to ensure that the transaction endorsement is successful as long as any node succeeds in endorsement, that is, the transaction endorsement is successful. While such customization provides flexibility in terms of blockchain endorsement requirements, writing validation rules for endorsement information for transactions thrown by Fabric in cross-chain transactions provides a significant barrier, as there is a significant overhead, both in terms of workload and complexity, if a corresponding validation rule is written for each policy.
The conventional cross-chain verification cannot verify a complex endorsement policy, but can verify a simple endorsement policy, such as a transaction signed by one node or signed by a fixed number of nodes. Generally, for a default Fabric network, the endorsement policy is that the transaction can be considered to be valid as long as any node in the endorsement node pool endorses the transaction, so that the simple endorsement policy only needs to store the certificates of all endorsement nodes in the cross-chain network, and only needs to traverse the certificates for signature verification during verification. But for the complex endorsement strategy, the simple traversal cannot be performed, and the cross-chain requirement of the Fabric complex endorsement strategy in actual production cannot be met at all.
Disclosure of Invention
The invention aims to provide a method for verifying a Fabric complex endorsement policy in a cross-chain mode aiming at the defects of the prior art.
The purpose of the invention is realized by the following technical scheme: a method for verifying a Fabric complex endorsement policy in a cross-chain comprises the following steps:
(1) registering all MSP lists, chain code IDs and expressions of endorsement strategies in a block chain network into a cross-chain network by the Fabric block chain;
(2) when the Fabric blockchain generates a cross-chain transaction, the transaction information which is linked up is transmitted to a relay chain of a cross-chain network, and the relay chain carries out endorsement verification on the transaction information, and the method comprises the following sub-steps:
(2.1) the relay chain analyzes the execution result of the transaction proposal and the signature set of the endorsement node on the execution result of the transaction proposal from the transaction information;
(2.2) performing semantic analysis on an expression of an endorsement policy of the Fabric blockchain registered in the cross-chain network in the step (1) to split the expression into a logic syntax tree, and mapping the logic syntax tree and an MSP list transmitted into the cross-chain network in the step (1) to generate an endorsement policy interpreter;
(2.3) the relay link compares the chain code ID in the execution result of the transaction proposal obtained in the step (2.1) with the chain code ID registered in the cross-link network by the Fabric in the step (1), confirms that the chain code IDs are consistent, and if the chain code IDs are not consistent, the verification fails;
(2.4) placing the signature set of the endorsement node obtained in the step (2.1) on the execution result of the transaction proposal into the endorsement policy interpreter generated in the step (2.2), checking whether the number of the signature sets conforms to the expression of the endorsement policy transmitted in the step (1) by the endorsement policy interpreter, judging whether the logic of the signature set conforms to the logic syntax tree, extracting a certificate of the endorsement policy requirement in an MSP (mixed signal processor) list hooked with the logic syntax tree in the step (2.2), and checking the signature of the signature set; if the signature of the signature set meets the requirements of the endorsement policy interpreter and the signature passes the verification, the verification is passed, otherwise, the verification fails.
Further, the step (2.2) is specifically: adopting an abstract syntax tree to perform semantic analysis on the expression of the endorsement policy of the Fabric blockchain registered in the cross-chain network in the step (1) and converting the expression into a tree-shaped data structure to obtain a logic syntax tree, and then mapping the logic syntax tree and an MSP list transmitted into the cross-chain network in the step (1) to generate the endorsement policy interpreter.
Further, when the endorsement policy in the Fabric blockchain is updated, the expression of the endorsement policy is synchronously updated into the cross-chain network, and a new endorsement policy interpreter is generated at the time of verification of each transaction.
The invention has the beneficial effects that: in the invention, a Fabric block chain registers an MSP list, a chain code ID and an endorsement strategy description in a cross-chain network, transmits a generated cross-chain transaction to a relay chain, then the relay chain analyzes a transaction execution result and an endorsement node signature set to generate an endorsement strategy interpreter, confirms that the transaction execution result is consistent with the chain code ID registered in the cross-chain network, and finally the endorsement strategy interpreter verifies the signature set; the invention has the following characteristics:
1. the invention can verify the user-defined complex endorsement strategy;
2. the method is user-friendly to the Fabric network, verification strategies do not need to be compiled by self, and endorsement strategy descriptions only need to be submitted;
3. the invention can prevent the user from carrying out malicious attack through different chain codes.
Drawings
FIG. 1 is a schematic diagram of a registration phase of a Fabric to a cross-link network;
FIG. 2 is a flow chart of the verification of the Fabric Complex validation rule.
Detailed Description
The invention discloses a method for verifying a Fabric complex endorsement policy in a cross-chain, which comprises the following steps:
(1) as shown in FIG. 1, during the registration phase of a Fabric blockchain to a cross-chain network, the Fabric blockchain registers a list of MSPs of all institutions in the blockchain network, a chain code ID used to send cross-chain transactions, and an endorsement policy description into the cross-chain network.
The Fabric MSP list needs to include MSP lists of all organizations in the Fabric blockchain network, and MSP lists of multiple organizations need to be combined when the endorsement policy is generated, instead of only taking the MSP list of a single organization as an input source of the endorsement policy.
(2) As shown in fig. 2, when a Fabric blockchain generates a cross-chain transaction, the transaction information that has been linked up is transmitted to a relay chain of a cross-chain network, and the relay chain performs endorsement verification on the transaction information, including the following sub-steps:
and (2.1) the relay chain analyzes the execution result of the transaction proposal and the signature set of the endorsement node on the execution result of the transaction proposal from the transaction information.
(2.2) compiling the endorsement policy description of the Fabric blockchain registered in the cross-chain network in the step (1), and generating an endorsement policy interpreter by combining with an MSP (mixed-Signal processor) list registered in the cross-chain network, specifically: semantic analysis is carried out on the endorsement policy description, the endorsement policy description is split into a logic Syntax Tree, for example, an Abstract Syntax Tree (AST) is used for converting an endorsement policy expression into a Tree-shaped data structure, and then the logic Syntax Tree is hooked with an MSP list transmitted into a cross-chain network in the step (1).
It should be noted that, when the endorsement policy in the Fabric blockchain is updated, the endorsement policy is synchronously updated to the cross-chain network, and the verification method of the invention generates a new endorsement policy interpreter during each transaction verification, rather than permanently generating a cached interpreter for a specific Fabric blockchain. The updating of the endorsement policy does not affect the updating of the authentication method.
And (2.3) the relay link compares the link code ID in the execution result of the transaction proposal with the link code ID registered in the cross-link network by the Fabric in the step (1), confirms that the link code IDs are consistent, and if the link code IDs are not consistent, the verification fails.
In order to prevent malicious attacks, when a transaction sent by a Fabric is verified, the ID of the chain code needs to be checked, and a malicious attacker is prevented from achieving the purpose of malicious transaction through false transactions constructed by different chain codes.
(2.4) putting the signature set of the endorsement node obtained in the step (2.1) on the execution result of the transaction proposal into the endorsement policy interpreter generated in the step (2.2), and verifying the endorsement policy interpreter through the logic syntax tree obtained in the step (2.2), wherein the verification is specifically as follows: checking whether the number of the signature sets conforms to the endorsement policy description transmitted in the step (1), judging whether the logic of the signature sets conforms to the logic syntax tree, extracting the certificate required by the endorsement policy in the MSP list hooked with the logic syntax tree in the step (2.2), and checking the signature of the endorsement node on the signature sets of the execution result of the transaction proposal; if the signature of the signature set meets the requirements of the endorsement policy interpreter and the signature passes the verification, the verification is passed, otherwise, the verification fails.
To elaborate on the specific authentication process, an example is used, when organization 1 (with member A, B), organization 2 (with member C, D) and organization 3 (with member E, F) form a Fabric blockchain network, the MSP lists of organization 1, organization 2 and organization 3 need to be submitted to the cross-chain network during registration of the Fabric network to the cross-chain network. Meanwhile, if the Fabric blockchain specifies an endorsement policy of add (Or add 2.c, Or add 3.e)) at this time, the policy expression also needs to be registered in the cross-chain network, And the chain code ID involved in the cross-chain transaction needs to be registered. After the registration is finished, if the Fabric network generates a cross-chain transaction, the cross-chain transaction is submitted to the cross-chain network, the cross-chain network needs to verify transaction information, a grammar tree is generated according to the endorsement policy expression, leaf nodes of the grammar tree are a member A, a member C and a member E, and at the moment, the mapping between the members of the leaf nodes and the certificate of the member in the MSP list needs to be established. An endorsement policy interpreter is generated from this syntax tree that produces the mappings. The signature set of the endorsement node in the transaction message can then be verified by the interpreter.
Claims (3)
1.A method for verifying a Fabric complex endorsement policy in a cross-chain manner is characterized by comprising the following steps:
(1) the Fabric blockchain registers all MSP lists, chain code IDs, expressions of endorsement policies and the like in the blockchain network into the cross-chain network.
(2) When the Fabric blockchain generates a cross-chain transaction, the transaction information which is linked up is transmitted to a relay chain of a cross-chain network, and the relay chain carries out endorsement verification on the transaction information, and the method comprises the following sub-steps:
and (2.1) the relay chain analyzes the execution result of the transaction proposal, the signature set of the endorsement node on the execution result of the transaction proposal and the like from the transaction information.
And (2.2) performing semantic analysis on the expression of the endorsement policy of the Fabric blockchain registered in the cross-chain network in the step (1) to split the expression into a logic syntax tree, and then mapping the logic syntax tree and the MSP list transmitted into the cross-chain network in the step (1) to generate the endorsement policy interpreter.
And (2.3) the relay link compares the chain code ID in the execution result of the transaction proposal obtained in the step (2.1) with the chain code ID registered in the cross-link network by the Fabric in the step (1), confirms that the chain code IDs are consistent, and if the chain code IDs are not consistent, the verification fails.
(2.4) placing the signature set of the endorsement node obtained in the step (2.1) on the execution result of the transaction proposal into the endorsement policy interpreter generated in the step (2.2), checking whether the number of the signature sets conforms to the expression of the endorsement policy transmitted in the step (1) by the endorsement policy interpreter, judging whether the logic of the signature set conforms to the logic syntax tree, extracting a certificate of the endorsement policy requirement in an MSP (mixed signal processor) list hooked with the logic syntax tree in the step (2.2), and checking the signature of the signature set; if the signature of the signature set meets the requirements of the endorsement policy interpreter and the signature passes the verification, the verification is passed, otherwise, the verification fails.
2. The method for validating the Fabric complex endorsement policy in the cross-chain as claimed in claim 1, wherein the step (2.2) is specifically as follows: adopting an abstract syntax tree to perform semantic analysis on the expression of the endorsement policy of the Fabric blockchain registered in the cross-chain network in the step (1) and converting the expression into a tree-shaped data structure to obtain a logic syntax tree, and then mapping the logic syntax tree and an MSP list transmitted into the cross-chain network in the step (1) to generate the endorsement policy interpreter.
3. The method for verifying the Fabric complex endorsement policy in the cross-chain as claimed in claim 1, wherein when the endorsement policy in the Fabric blockchain is updated, the expression of the endorsement policy is synchronously updated into the cross-chain network, and a new endorsement policy interpreter is generated at each transaction verification.
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| CN111563744B (en) | 2023-05-26 |
| CN116582272A (en) | 2023-08-11 |
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