DNSProvejs

DNSProvejs 介绍

DNSProvejs 是一个在以太坊的 DNSSEC oracle 合约上建立可信 DNS 记录内容的工具（源代码）。

功能

  • 按照给定的域名和类型获取其 DNS 信息
  • 验证 DNS 并构造证明
  • 将证明提交到 DNSSEC（域名系统安全扩展）Oracle 智能合约
  • 在浏览器和 node.js 中应用

快速开始

安装

npm install '@ensdomains/dnsprovejs' --save

使用

var provider  = web3.currentProvider;
var DnsProve  = require('dnsprove');
var dnsprove  = new DnsProve(provider);
var textDomain = '_ens.matoken.xyz';
var dnsResult = await dnsprove.lookup('TXT', textDomain);
var oracle    = await dnsprove.getOracle('0x123...');
var proofs = dnsResult.proofs;

if(dnsResult.found){
    await oracle.submitAll(dnsResult, {from:nonOwner});
}else if (dnsResult.nsec){
    await oracle.deleteProof(
        'TXT', textDomain,
        proofs[proofs.length -1],
        proofs[proofs.length -2],
        {from:nonOwner}
    );
}else{
    throw("DNSSEC is not supported")
}

另外，除了向 Oracle 合约提交证明，如果你还想通过 dnsregistrar 来声明它，那么你可以调用 getAllProofs 并将结果传递给 proveAndClaim 函数。

let dnsResult = await dnsprove.lookup('TXT', '_ens.matoken.xyz', address);
let oracle    = await dnsprove.getOracle(address);
let data = await oracle.getAllProofs(dnsResult, params);
await registrar.methods
    .proveAndClaim(encodedName, data[0], data[1])
    .send(params)

DnsRegistrar 库

上面的代码演示了直接在智能合约中调用 proveAndClaim 函数的情形，此外我们还有一个经过封装的库：DNSregistrar ，它在一个函数调用中同时调用了 DNSSEC Oracle 和 DNSregistrar。

var DNSRegistrarJs = require('@ensdomains/dnsregistrar');
dnsregistrar = new DNSRegistrarJs(provider, dnsregistraraddress);
dnsregistrar.claim('foo.test').then((claim)=>{
    claim.submit({from:account});
})

深入了解

工作原理

DNSSEC（域名系统安全扩展）从 ICANN 签名的根密钥（.）开始，逐级向下，建立了一个信任链。我们首先来了解 DNS 的根密钥的哈希值（这个哈希值通过硬编码的方式写在 Oracle 智能合约中）。如果给定了一个密钥的哈希值，我们可以通过传入真正的密钥，来验证它是否匹配这个哈希值，并将其添加到可信记录集。

有了这个密钥，我们现在就可以验证用这个密钥签名的任何记录，在下图的示例中，显示的是 xyz 这一顶级域名的哈希。有了这些，我们就能识别密钥，等等。

接下来，您可以识别 ethlab.xyz 的密钥。我们可以先识别密钥的哈希值，再识别密钥本身，最后可以验证包含以太坊地址的签名文本记录。

构造证明

To construct a proof to submit to Oracle smart contract, you first need to provide name, rrsig, and rrset.
要构造一个提交给 Oracle 智能合约的证明，您首先需要提供 name rrsig 和 rrset 。

name：DNS 记录的名称

let name = '.'

rrsig：资源记录的数字签名

let sig = { name: '.',
    type: 'RRSIG',
    ttl: 0,
    class: 'IN',
    flush: false,
    data:
    { typeCovered: 'DNSKEY',
        algorithm: 253,
        labels: 0,
        originalTTL: 3600,
        expiration: 2528174800,
        inception: 1526834834,
        keyTag: 5647,
        signersName: '.',
        signature: new Buffer([]) }
    }

rrset：DNS 资源记录设置

let rrs = [
        {
            name: '.',
            type: 'DNSKEY',
            ttl: 3600,
            class: 'IN',
            flush: false,
            data: { flags: 257, algorithm: 253, key: Buffer.from("1111", "HEX")}
        },
        {
            name: '.',
            type: 'DNSKEY',
            ttl: 3600,
            class: 'IN',
            flush: false,
            data: { flags: 257, algorithm: 253, key: Buffer.from("1111", "HEX")}
        },
        {
            name: '.',
            type: 'DNSKEY',
            ttl: 3600,
            class: 'IN',
            flush: false,
            data: { flags: 257, algorithm: 253, key: Buffer.from("1112", "HEX")}
        }
    ]

构建好数据，并将用于建立证明的数据实例化到一个 Result 对象，然后 toSubmit 就能够生成输入数据。

      const Result = require('@ensdomains/dnsprovejs/dist/dns/result')
      let result = new Result([{name,sig,rrs}])
      result.proofs[0].toSubmit()
      // [ '0x0030fd0000000e1096b0e2d05b01a692160f00000030000100000e100006010103fd1111000030000100000e100006010103fd1111000030000100000e100006010103fd1112',
'0x' ]

相关库

DnsProver 库及其函数

DnsProver 允许您查找给定 DNS 类型的域名，并返回可以提交给 DNSSEC Oracle 的 DNS 记录和证明。

DnsProver.lookup(type, query)

  /**
   * lookup takes DNS record type and name and returns `DnsResult` object.
   *
   * @param {string} type - eg: TXT
   * @param {string} query - eg: _ens.yourdomain.xyz
   * @returns {Object} DnsResult - contains list of results retrieved from DNS record and proofs which are constructed from the record and used to submit into DNSSEC Oracle
   */
DnsProver.getOracle(address)

  /**
   * getOracle returns Oracle object
   *
   * @param {string} address - DNSSEC Oracle contract address
   * @returns {Object} Oracle - allows you to call DNSSEC oracle functions
   *
   */

Oracle 库及其函数

Oracle 与 DNSSEC Oracle 智能合约进行交互。

Oracle.knownProof(proof)

  /**
   * kownProof
   * @param {Object} proof
   * @param {string} proof.name - eg 'ethlab.xyz'
   * @param {type} proof.type - eg 'TXT'
   * @returns {Object} oracle_proof - contains list of results retrieved from DNS record and proofs
   */
Oracle.submitAll(result, params)

  /**
   * submitAll submits all required proofs into the DNSSEC oracle as one transaction in a batch.
   * @param {Object} result
   * @param {Object} params - from, gas, gasPrice, etc
   */
Oracle.getAllProofs(result)

  /**
   * getAllProofs returns all the proofs needs to be submitted into DNSSEC Oracle.
   * It traverses from the leaf of the chain of proof to check if proof in DNSSEC Oracle
   * and the one from DNS record matches with valid inception value.
   * This function is used so that it can pass the necessary proof to `dnsregistrar.proveAndClaim` function.
   *
   * @param {Object} result
   * @returns {string} data
   * @returns {Object} prevProof
   */
Oracle.submitProof(proof, prevProof, params)

  /**
   * submitProof submits a proof to Oracle contract.
   * If `prevProof` is `null`, the oracle contract uses hard-coded root anchor proof to validate the validity of the proof given.
   * `params` is used to pass any params to be sent to transaction, such as `{from:address}`.
   * @param {Object} proof
   * @param {Object} prevProof
   * @param {Object} params - from, gas, gasPrice, etc
   * @returns {boolean} success - returns true unless transaction fails
   */
Oracle.deleteProof(type, name, proof, prevProof, params)

  /**
   * deleteProof deletes a proof
   * @param {string} type - eg: TXT
   * @param {string} name - eg: _ens.matoken.xyz
   * @param {string} proof
   * @param {string} prevProof
   * @param {Object} params - from, gas, gasPrice, etc
   */
OracleProof

  /**
   * @constructor
   * @param {Object} proof
   * @param {number} proof.inception - time the signature was generated
   * @param {number} proof.inserted - time the record was inserted into DNSSEC oracle
   * @param {string} proof.hash - hash of proof stored in DNSSEC oracle
   * @param {string} proof.hashToProve - hash of proof constructed from DNS record
   * @param {boolean} proof.validInception - true if inception in DNSSEC oracle is older than the one from DNS record.
   * @param {boolean} proof.matched - true if inception is valid and hash is matched
   */

Proof 库及其函数

Proof 包含提交到 DNSSEC Oracle 的 rrset 和签名数据。

Proof

  /**
   * @constructor
   * @param {string} name
   * @param {string} type
   * @param {string} sig
   * @param {number} inception
   * @param {string} sigwire
   * @param {string} rrdata
   */
Proof.toSubmit()

  /**
   * toSubmit returns an array consisting of hex string of sigwiredata (concatinatd string of sigwire and rrdata) and its signature
   * @returns {array} data
   */

DnsResult 库

DnsResult 是一个通过调用 lookup 函数返回的对象，它包含有关 DNS 记录的信息。

DnsResult

  /**
   *
   * @constructor
   * @param {Object} dns_result
   * @param {boolean} dns_result.found - true if the given record exists
   * @param {boolean} dns_result.nsec  - true if the given record does not exist and NSEC/NSEC3 is enabled
   * @param {Array} dns_result.results - an array of SignedSet containing name, signature, and rrs
   * @param {Array} dns_result.proofs  - an array of proofs constructed using results
   * @param {string} dns_result.lastProof - the last proof which you submit into Oracle contruct
   */
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