CN111563744B - Method for verifying Fabric complex endorsement policy in cross-chain - Google Patents
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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
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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 a Fabric blockchain registers an MSP list, a chain code ID and an endorsement policy description in the cross-chain network, a generated cross-chain transaction is transmitted to a relay chain, the relay chain analyzes a transaction execution result and an endorsement node signature set to generate an endorsement policy interpreter, the transaction execution result is confirmed to be consistent with the chain code ID registered in the cross-chain network, verification fails if the transaction execution result is inconsistent with the chain code ID, and finally the endorsement policy interpreter verifies the signature set. The invention can verify the user-defined complex endorsement strategy; the method is friendly to users of the Fabric network, does not need to write verification strategies, and only needs to submit endorsement strategy descriptions; the malicious attack of the user through different chain codes can be prevented.
Description
Technical Field
The invention belongs to the technical field of blockchains, and particularly relates to a method for verifying a Fabric complex endorsement policy in a cross-chain.
Background
The cross-chain technology refers to cross-chain interoperation of the ledger by connecting relatively independent blockchain systems. In terms of asset exchange, some blockchains are in fact still isolated from each other, the interworking barriers between the various blockchain applications are very high at present, and verification of transactions at asset exchange is a very significant challenge.
The verification of the cross-chain transaction generated by the Fabric block chain is particularly a difficulty, and the Fabric block chain has a specified endorsement node for endorsing the transaction, wherein the Fabric endorsement node is a set formed by a plurality of nodes, and a user can perform custom endorsement policy formulation on the set, such as prescribing which node or some of several nodes must endorse. For example, if there are endorsement nodes a, B, C, D in the Fabric blockchain, the user may define that if any node endorse is successful, the transaction endorse is successful, it may also be specified that there must be two nodes a, B that endorse successfully to make the transaction endorse successful. However, while such customization provides the flexibility of blockchain requirements for endorsements, the writing of validation rules for endorsement information for Fabric-thrown transactions in cross-chain transactions provides a significant hurdle, if a corresponding validation rule is written for each policy, it is a little overhead, both in terms of workload and complexity.
Typical cross-chain verification cannot verify complex endorsement policies, but only simple endorsement policies, such as transactions signed by one node or signed by a fixed number of nodes. Generally, for a default Fabric network, an endorsement policy can consider that a transaction is valid as long as any node in an endorsement node pool endorses the transaction, so that a simple endorsement policy only needs to store certificates of all endorsement nodes into a cross-chain network, and only needs to traverse the certificates for signature verification during verification. However, for a complex endorsement policy, the complex endorsement policy cannot be achieved through simple traversal, and the cross-chain requirement of the Fabric complex endorsement policy in actual production cannot be completely met.
Disclosure of Invention
The invention aims to provide a method for verifying a Fabric complex endorsement policy in a cross-chain manner aiming at the defects of the prior art.
The aim 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) The Fabric blockchain registers all MSP lists, the chain code IDs and expressions of endorsement policies in the blockchain network to the cross-chain network;
(2) When the Fabric block chain generates a cross-chain transaction, transmitting the transaction information which is already uplink to a relay chain of a cross-chain network, and carrying out endorsement verification on the transaction information by the relay chain, wherein the method comprises the following substeps:
(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) firstly, carrying out semantic analysis on the expression of the endorsement policy registered in the cross-link network by the Fabric blockchain in the step (1) to split the expression into a logic grammar tree, and then mapping the logic grammar tree with the MSP list transmitted into the cross-link network in the step (1) to generate an endorsement policy interpreter;
(2.3) the relay chain 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-chain network by the Fabric in the step (1), confirms that the chain code ID is consistent, and if the chain code ID is inconsistent, the verification fails;
(2.4) putting the signature set of the executing result of the transaction proposal by the endorsement node obtained in the step (2.1) into an endorsement policy interpreter generated in the step (2.2), checking whether the number of the signature sets accords with the expression of the endorsement policy transmitted in the step (1), judging whether the logic of the signature sets accords with a logic grammar tree, extracting a certificate required by the endorsement policy in an MSP list hooked with the logic grammar tree in the step (2.2), and checking the signature sets; if the signature of the signature set meets the requirements of the endorsement policy interpreter, and the signature verification passes, the verification passes, otherwise, the verification fails.
Further, the step (2.2) specifically comprises: and (3) carrying out semantic analysis on the expression of the endorsement policy registered in the cross-link network by the Fabric blockchain in the step (1) by adopting an abstract syntax tree, converting the expression into a tree-like data structure to obtain a logic syntax tree, and then mapping the logic syntax tree with the MSP list transmitted into the cross-link network in the step (1) to generate an endorsement policy interpreter.
Further, when the endorsement policy in the Fabric blockchain is updated, the expressions of the endorsement policy are synchronously updated into the cross-chain network, and a new endorsement policy interpreter is generated at each transaction verification.
The beneficial effects of the invention are as follows: the Fabric blockchain registers an MSP list, a chain code ID and an endorsement policy description into a cross-chain network, transmits generated cross-chain transactions 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 finally verifies the signature set by the endorsement policy interpreter; the invention has the following characteristics:
1. the invention can verify the user-defined complex endorsement strategy;
2. the method is friendly to users of the Fabric network, does not need to write verification strategies, and only needs to submit endorsement strategy descriptions;
3. the invention can prevent users from carrying out malicious attack through different chain codes.
Drawings
FIG. 1 is a schematic diagram of a registration phase of Fabric registration to a cross-link network;
FIG. 2 is a schematic diagram of a process for verifying a complex verification rule.
Detailed Description
The invention discloses a method for verifying a Fabric complex endorsement policy in a cross-chain manner, which comprises the following steps:
(1) As shown in FIG. 1, during the registration phase of the Fabric blockchain registering to the cross-chain network, the Fabric blockchain registers the MSP list of all organizations in the blockchain network, the chain code ID used to send the cross-chain transaction, and the endorsement policy description together into the cross-chain network.
The MSP list of the Fabric needs to contain MSP lists of all institutions in the Fabric blockchain network, and when an endorsement policy is generated, the MSP lists of a plurality of institutions need to be combined, rather than only the MSP list of a single institution is used as an input source of the endorsement policy.
(2) As shown in fig. 2, when the Fabric blockchain generates a cross-chain transaction, the transaction information which is already uplink is transmitted to a relay chain of the cross-chain network, and the relay chain performs endorsement verification on the transaction information, which comprises the following substeps:
and (2.1) analyzing the execution result of the transaction proposal and the signature set of the endorsement node on the execution result of the transaction proposal by the relay chain 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 the MSP list registered in the cross-chain network, wherein the endorsement policy interpreter specifically comprises: the description of the endorsement policy is subjected to semantic analysis and split into a logic grammar tree, for example, an abstract grammar tree (Abstract Syntax Tree, AST) is used for converting the expression of the endorsement policy into a tree-shaped data structure, and then the logic grammar tree and the MSP list which is transmitted into the cross-chain network in the step (1) are hooked.
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 in the invention generates a new endorsement policy interpreter at each transaction verification, instead of permanently generating a cached interpreter for a specific Fabric blockchain. The update of the endorsement policy does not affect the update of the verification method.
And (2.3) comparing the chain code ID in the execution result of the transaction proposal with the chain code ID of the Fabric registered in the cross-chain network in the step (1) by the relay chain, and confirming that the chain code IDs are consistent, and if the chain code IDs are inconsistent, failing to verify.
In order to prevent malicious attacks, when verifying transactions sent by Fabric, the ID of a chain code needs to be verified, so that malicious attackers are prevented from constructing false transactions through different chain codes to achieve the purpose of malicious transactions, when analyzing transaction information transmitted into a cross-chain network, the ID of the chain code needs to be extracted first, the extracted ID is compared with the ID of the chain code registered in the cross-chain network in advance, only the same ID can indicate that the transactions are indeed generated by the corresponding chain code, and MSP identity authentication can be continued.
(2.4) putting the signature set of the executing result of the transaction proposal by the endorsement node obtained in the step (2.1) into an endorsement policy interpreter generated in the step (2.2), and verifying the signature set by the endorsement policy interpreter through a logic grammar tree obtained in the step (2.2), wherein the method specifically comprises the following steps: checking whether the number of the signature sets accords with the endorsement policy description transmitted in the step (1), judging whether the logic of the signature sets accords with a logic grammar tree, extracting certificates required by the endorsement policy in an MSP list hooked with the logic grammar tree in the step (2.2), and checking signature of the endorsement node on the signature sets of the execution results of the transaction proposal; if the signature of the signature set meets the requirements of the endorsement policy interpreter, and the signature verification passes, the verification passes, otherwise, the verification fails.
One example may be used to detail a specific verification process that requires submitting the MSP lists of organization 1, organization 2, and organization 3 to the cross-chain network at the stage of registration of the Fabric network to the cross-chain network after organization 1 (containing member A, B), organization 2 (containing member C, D), and organization 3 (containing member E, F) have formed the Fabric blockchain network. Meanwhile, if the Fabric blockchain specifies an endorsement policy such as an And (org1.a, or (org2.c, org3.e)), the policy expression needs to be registered together with the cross-chain network, and the chain code ID involved in the cross-chain transaction needs to be registered. After registration, if the Fabric network generates a cross-link transaction, the cross-link transaction is submitted to the cross-link network, transaction information is required to be verified by the cross-link network, a grammar tree is firstly generated according to the above endorsement policy expression, leaf nodes of the grammar tree are member A, member C and member E, and at the moment, mapping is required to be established between the member of the leaf node and the certificate of the member in the MSP list. An endorsement policy interpreter is generated by this syntax tree that generates the map. This allows the signature set of the endorsement node in the transaction information to be verified by the interpreter.
Claims (3)
1.A method for verifying a Fabric complex endorsement policy in a cross-chain is characterized by comprising the following steps:
(1) The Fabric blockchain registers all MSP lists, the chain code IDs and expressions of endorsement policies in the blockchain network to the cross-chain network;
(2) When the Fabric block chain generates a cross-chain transaction, transmitting the transaction information which is already uplink to a relay chain of a cross-chain network, and carrying out endorsement verification on the transaction information by the relay chain, wherein the method comprises the following substeps:
(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) firstly, carrying out semantic analysis on the expression of the endorsement policy registered in the cross-link network by the Fabric blockchain in the step (1) to split the expression into a logic grammar tree, and then mapping the logic grammar tree with the MSP list transmitted into the cross-link network in the step (1) to generate an endorsement policy interpreter;
(2.3) the relay chain 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-chain network by the Fabric in the step (1), confirms that the chain code ID is consistent, and if the chain code ID is inconsistent, the verification fails;
(2.4) putting the signature set of the executing result of the transaction proposal by the endorsement node obtained in the step (2.1) into an endorsement policy interpreter generated in the step (2.2), checking whether the number of the signature sets accords with the expression of the endorsement policy transmitted in the step (1), judging whether the logic of the signature sets accords with a logic grammar tree, extracting a certificate required by the endorsement policy in an MSP list hooked with the logic grammar tree in the step (2.2), and checking the signature sets; if the signature of the signature set meets the requirements of the endorsement policy interpreter, and the signature verification passes, the verification passes, otherwise, the verification fails.
2. The method for verifying a Fabric complex endorsement policy in a cross-chain as claimed in claim 1, wherein the step (2.2) is specifically: and (3) carrying out semantic analysis on the expression of the endorsement policy registered in the cross-link network by the Fabric blockchain in the step (1) by adopting an abstract syntax tree, converting the expression into a tree-like data structure to obtain a logic syntax tree, and then mapping the logic syntax tree with the MSP list transmitted into the cross-link network in the step (1) to generate an endorsement policy interpreter.
3. The method of claim 1, wherein when the endorsement policy in the Fabric blockchain is updated, the expressions of the endorsement policy are synchronously updated into the cross-chain network and a new endorsement policy interpreter is generated at each transaction verification.
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