首页 > 解决方案 > 如何在 GO 中创建具有扩展名和属性值的证书签名请求?

问题描述

我正在尝试使用 crypto/x509 包来创建证书请求(csr),但我不知道如何添加扩展和属性参数。

CertificateRequest 结构中,我们可以看到扩展是 pkix.Extension 类型。这是pki.Extension的结构:

type Extension struct {
        Id       asn1.ObjectIdentifier
        Critical bool `asn1:"optional"`
        Value    []byte
}

在代码中搜索我在https://golang.org/src/crypto/x509/x509.go中找到了以下常量:

var (
    oidExtKeyUsageAny                            = asn1.ObjectIdentifier{2, 5, 29, 37, 0}
    oidExtKeyUsageServerAuth                     = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 1}
    oidExtKeyUsageClientAuth                     = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 2}
    oidExtKeyUsageCodeSigning                    = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 3}
    oidExtKeyUsageEmailProtection                = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 4}
    oidExtKeyUsageIPSECEndSystem                 = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 5}
    oidExtKeyUsageIPSECTunnel                    = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 6}
    oidExtKeyUsageIPSECUser                      = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 7}
    oidExtKeyUsageTimeStamping                   = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 8}
    oidExtKeyUsageOCSPSigning                    = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 9}
    oidExtKeyUsageMicrosoftServerGatedCrypto     = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 311, 10, 3, 3}
    oidExtKeyUsageNetscapeServerGatedCrypto      = asn1.ObjectIdentifier{2, 16, 840, 1, 113730, 4, 1}
    oidExtKeyUsageMicrosoftCommercialCodeSigning = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 311, 2, 1, 22}
    oidExtKeyUsageMicrosoftKernelCodeSigning     = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 311, 61, 1, 1}
)

好的,现在我有了参数的 ID。就我而言,我想将 KeyUsage 扩展设置为 serverAuth。我有身份证,但价值是多少?

我不知道我的方法是否正确。有人可以帮我解决这个问题吗?

标签: gocertificatecsr

解决方案


属性字段被视为已弃用并且无法正常工作。

当我必须向 csr 添加属性时,我将 x509.CreateCertificateRequest 所需的功能复制到内部文件中,并通过在编组证书请求的 tbsCSR 字段之前以原始格式添加我的属性来修复 CreateCertificateRequest。注意:certificateRequest 结构不是 x509.CertfiacteRequest,该结构用于编组。下面是 passwordChallengeAttribute 的代码示例:

var oidChallengePassword = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 9, 7}

type passwordChallengeAttribute struct {
    Type  asn1.ObjectIdentifier
    Value []string `asn1:"set"`
}

passwordAttribute := passwordChallengeAttribute{
    Type:  oidChallengePassword,
    Value: []string{challenge},
}

b, err := asn1.Marshal(passwordAttribute)
if err != nil {
    //
}

var rawAttribute asn1.RawValue
asn1.Unmarshal(b, &rawAttribute)
tbsCSR.RawAttributes = append(tbsCSR.RawAttributes, rawAttribute)

但是使用扩展更好并且受支持,因此您只需要实现表示所需扩展的数据结构,将其编组并添加到扩展列表中。例如,添加 BasicConstraints 扩展:

type basicConstraints struct {
    IsCA       bool `asn1:"optional"`
    MaxPathLen int  `asn1:"optional,default:-1"`
}   
var extensions []pkix.Extension
basicCon := basicConstraints{IsCA: true, MaxPathLen: -1} 
bitstr, err := asn1.Marshal(basicCon)
if err != nil {
    //  
}   
var oidExtensionBasicConstraints = []int{2, 5, 29, 19} //export from x509 package
bcExt := pkix.Extension{Id: oidExtensionBasicConstraints, Value: bitstr}
extensions = append(extensions, bcExt)
csrTmpl := &x509.CertificateRequest{
    Extensions:    extensions,
}

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