使用Pkcs10CertificationRequest获取主题备用名称 [英] Getting Subject Alternate Names with Pkcs10CertificationRequest

问题描述

除请求的扩展程序（特别是 X509v3使用者备用名称）外，我目前能够解码CSR的值。这是我的DecodeCSR（string csr）中
的相关部分：

  public void DecodeCsr（string csrStr）{
 //只得到csr 
 var csrChars = Regex.Replace（csrStr，@ ----- [^-] + -----，）.Trim（）。Replace（ ，）.Replace（Environment.NewLine，）.ToCharArray（）; 
 //将该字符串转换为字节数组
 byte [] csrEncode = Convert.FromBase64CharArray（csrChars，0，csrChars.Length）; 
 //将字节数组
赋予decodeCsr Pkcs10CertificationRequest encodeCsr = new Pkcs10CertificationRequest（csrEncode）; 
 //获取一串主题信息
字符串subject = encodeCsr.GetCertificationRequestInfo（）。Subject.ToString（）; 
 //这就是我如何获取属性
的DerSet DerSet atts =（DerSet）decodeCsr.GetCertificationRequestInfo（）。Attributes; 
} 
  

以下是使用SAN的测试csr：

'pre> 串CSR =----- BEGIN CERTIFICATE REQUEST ----- MIIC1DCCAbwCAQAwXjELMAkGA1UEBhMCVVMxEDAOBgNVBAgMB0dlb3JnaWExEDAOBgNVBAcMB0F0bGFudGExDTALBgNVBAoMBFRlc3QxHDAaBgNVBAMME3d3dy50aGlzaXNhdGVzdC5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDFU4pXLB3d8csjvRIkIdZfUF2m9sijtk1bqYohqVwYr3 + OyDRkfRuTCni8RJS9VOcl6n5aUiK27P4s5j9LqqfL0vS8B949P / ewb2ip2BGB1sEmxKcsEoZYNNEhMm9p7yNTAEqJ / WN0N1CpKBFV1J / w6xiQy5tUyUe7C9c8DX6K1uhEDF9pfeTaCNxYBShm0JFuAIqn6Z + RzbC7tdwc0KgN / bhx3bEvg8b0p / hgxd2veuUmB / fcIPsFawkGFPcQzLpSbc1Vb + zru40HAbRflyQckA3ZgRsa1OHsdiOyb8vpV7dUm4VHOm38bw2wVImRMfRtNZXrL / WiWcGadtFV8nxXAgMBAAGgMTAvBgkqhkiG9w0BCQ4xIjAgMB4GA1UdEQQXMBWCCHRlc3QuY29tggl0ZXN0Mi5jb20wDQYJKoZIhvcNAQELBQADggEBAKXxHlruiqtTwB1Ov17K + mz03EidfecdW + 9u8gcLdOOLKn5kCg6RuC0mCjGHvFGjE6ljFc5cyUFbfdqzd8QXh1f3AgxveR + oq1wExJNr0Yl6kjVEdtndvHhSzUmZZ02EcPbIq / eY5KSTdKidjvIJMwTUtIyUQ71y / vSVn0YavvXYo / re57kC7chW / NS / hZmHrZ6GvMWE9ea3P3jOKPyXCULJlbQCjXc6 CQJAkBlcKpvnW6kU2PjreDWzRMhzqZzUqhc6RsGzz84 / xwBsrYXfTj91FQd9 + w15CYzBEJOv / Iz3CfVGb4s1 + yUPVxgei2ezTjfQVcQgq4CusRNTE4;


我可以从 decodeCsr.GetCertificationRequestInfo（）。Attributes获得的信息是一个 Org.BouncyCastle.Asn1.DerSet ，看起来像这样：

  DerSet atts =（DerSet）decodeCsr.GetCertificationRequestInfo（）。Attributes; 
  

这是在调试模式下的样子（下面是总体对象的图片）：

  atts {[[1.2.840.113549.1.9.14，[[[2.5.29.17，＃3026820a61757374696e2e636f6d820b61757374696e322e636f6d820b61757374696e342e636f6d]]]]]}}] Org.BouncyCastle.Asn1.DerSet 
  

我可以在调试模式下看到 DerOctetString ，但是我不知道该如何使用它。我相信，如果我能做到的话，Hugo的答案可能适用，那就是 DerOctetStringParser ，但目前我无能为力。

我尝试将 atts 当作字符串来删除，OID获得的值与<$ c完全相同$ c> DerOctetString 在调试模式下并将其强制转换为 DerOctetString 无效，而且我认为答案的伸缩性不好。

解决方案

我使用以下代码进行了操作：

  public static void DecodeCsr（string csr）
 {
 csr = Regex.Replace（csr，@ ----- [^-] + ----- ，String.Empty）.Trim（）。Replace（，）.Replace（Environment.NewLine，）; 
 
 PemObject pem = new PemObject（ CSR，Convert.FromBase64String（csr））; 
 Pkcs10CertificationRequest请求=新的Pkcs10CertificationRequest（pem.Content）; 
 CertificationRequestInfo requestInfo = request.GetCertificationRequestInfo（）; 
 
 //属性是Sequence的集合，其中包含Asn1Object的集合
 //让我们找到包含ID为 1.2.840.113549.1.9.14的DerObjectIdentifier的序列b $ b DerSequence extensionSequence = requestInfo.Attributes.OfType< DerSequence>（）
 .First（o => o.OfType< DerObjectIdentifier>（）
 .Any（oo => oo.Id = = 1.2.840.113549.1.9.14））； 
 
 //让我们获取此序列的值集
 DerSet extensionSet = extensionSequence.OfType< DerSet>（）。First（）; 
 
 // estensionSet = [[2.5.29.17，＃30158208746573742e636f6d820974657374322e636f6d]]] 
 // extensionSet包含嵌套序列...让我们使用递归方法
 DerOctetString str = GetAsn1ObjectRecursive< DerOctetString>（extensionSet.OfType< DerSequence>（）。First（）， 2.5.29.17）； 
 
 GeneralNames名称= GeneralNames.GetInstance（Asn1Object.FromByteArray（str.GetOctets（）））; 
 Console.WriteLine（names.ToString（））; 
} 
 
静态T GetAsn1ObjectRecursive< T>（DerSequence序列，字符串ID）其中T：Asn1Object 
 {
 if（sequence.OfType< DerObjectIdentifier>（）。 Any（o => o.Id == id））
 {
返回序列.OfType< T>（）。First（）; 
} 
 
 foreach（顺序为DerSequence子序列。OfType< DerSequence>（））
 {
 T值= GetAsn1ObjectRecursive< T>（subSequence，id）; 
 if（value！= default（T））
 {
返回值； 
} 
} 
 
 return default（T）; 
} 
  

棘手的部分是 BouncyCastle 与集合兼容随处可见，请求的值位于嵌套的嵌套集合内。我使用递归函数，是因为我不确定您的CSR是否总是将此值嵌套。

I'm currently able to decode a CSR's values except for Requested Extensions, specifically X509v3 Subject Alternative Name. Here's the relevant part of my `DecodeCSR(string csr):

public void DecodeCsr(string csrStr){
//getting just csr
var csrChars = Regex.Replace(csrStr, @"-----[^-]+-----", "").Trim().Replace(" ", "").Replace(Environment.NewLine, "").ToCharArray();
//converting that string into a byte array
byte[] csrEncode = Convert.FromBase64CharArray(csrChars, 0, csrChars.Length);
//giving decodeCsr the byte array
Pkcs10CertificationRequest decodeCsr = new Pkcs10CertificationRequest(csrEncode);
//getting a string of subject information
string subject = decodeCsr.GetCertificationRequestInfo().Subject.ToString();
//here's how I'm getting a DerSet of attribute
DerSet atts = (DerSet)decodeCsr.GetCertificationRequestInfo().Attributes;
}

Here's a test csr with SANs:

string csr = "-----BEGIN CERTIFICATE REQUEST-----MIIC1DCCAbwCAQAwXjELMAkGA1UEBhMCVVMxEDAOBgNVBAgMB0dlb3JnaWExEDAOBgNVBAcMB0F0bGFudGExDTALBgNVBAoMBFRlc3QxHDAaBgNVBAMME3d3dy50aGlzaXNhdGVzdC5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDFU4pXLB3d8csjvRIkIdZfUF2m9sijtk1bqYohqVwYr3+OyDRkfRuTCni8RJS9VOcl6n5aUiK27P4s5j9LqqfL0vS8B949P/ewb2ip2BGB1sEmxKcsEoZYNNEhMm9p7yNTAEqJ/WN0N1CpKBFV1J/w6xiQy5tUyUe7C9c8DX6K1uhEDF9pfeTaCNxYBShm0JFuAIqn6Z+RzbC7tdwc0KgN/bhx3bEvg8b0p/hgxd2veuUmB/fcIPsFawkGFPcQzLpSbc1Vb+zru40HAbRflyQckA3ZgRsa1OHsdiOyb8vpV7dUm4VHOm38bw2wVImRMfRtNZXrL/WiWcGadtFV8nxXAgMBAAGgMTAvBgkqhkiG9w0BCQ4xIjAgMB4GA1UdEQQXMBWCCHRlc3QuY29tggl0ZXN0Mi5jb20wDQYJKoZIhvcNAQELBQADggEBAKXxHlruiqtTwB1Ov17K+mz03EidfecdW+9u8gcLdOOLKn5kCg6RuC0mCjGHvFGjE6ljFc5cyUFbfdqzd8QXh1f3AgxveR+oq1wExJNr0Yl6kjVEdtndvHhSzUmZZ02EcPbIq/eY5KSTdKidjvIJMwTUtIyUQ71y/vSVn0YavvXYo/re57kC7chW/Ns/hZmHrZ6GvMWE9ea3P3jOKPyXCULJlbQCjXc6CQJAkBlcKpvnW6kU2PjreDWzRMhzqZzUqhc6RsGzz84/xwBsrYXfTj91FQd9+w15CYzBEJOv/Iz3CfVGb4s1+yUPVxgei2ezTjfQVcQgq4CusRnDU5/7lmE=-----END CERTIFICATE REQUEST-----";

The information I can get from decodeCsr.GetCertificationRequestInfo().Attributes is an Org.BouncyCastle.Asn1.DerSet that looks like this:

DerSet atts = (DerSet)decodeCsr.GetCertificationRequestInfo().Attributes;

This is what it looks like in debug mode(a picture of the overal object is below):

atts    {[[1.2.840.113549.1.9.14, [[[2.5.29.17, #3026820a61757374696e2e636f6d820b61757374696e322e636f6d820b61757374696e342e636f6d]]]]]} Org.BouncyCastle.Asn1.DerSet

I can see the DerOctetString in debug mode, however I have no idea how to get to it. I believe if i can get that far Hugo's answer may be applicable, there is a DerOctetStringParser but at the moment I have nothing to give it.

I've tried to treat atts as a string removed the OIDs get the value exactly like the DerOctetString in debug mode and cast it as a DerOctetString that didn't work, and I don't believe that answer scales well.

解决方案

I made it work with the following code :

public static void DecodeCsr(string csr)
{
    csr = Regex.Replace(csr, @"-----[^-]+-----", String.Empty).Trim().Replace(" ", "").Replace(Environment.NewLine, "");

    PemObject pem = new PemObject("CSR", Convert.FromBase64String(csr));
    Pkcs10CertificationRequest request = new Pkcs10CertificationRequest(pem.Content);
    CertificationRequestInfo requestInfo = request.GetCertificationRequestInfo();

    // an Attribute is a collection of Sequence which contains a collection of Asn1Object
    // let's find the sequence that contains a DerObjectIdentifier with Id of "1.2.840.113549.1.9.14"
    DerSequence extensionSequence = requestInfo.Attributes.OfType<DerSequence>()
                                                          .First(o => o.OfType<DerObjectIdentifier>()
                                                                       .Any(oo => oo.Id == "1.2.840.113549.1.9.14"));

    // let's get the set of value for this sequence
    DerSet extensionSet = extensionSequence.OfType<DerSet>().First();

    // estensionSet = [[2.5.29.17, #30158208746573742e636f6d820974657374322e636f6d]]]
    // extensionSet contains nested sequence ... let's use a recursive method 
    DerOctetString str = GetAsn1ObjectRecursive<DerOctetString>(extensionSet.OfType<DerSequence>().First(), "2.5.29.17");

    GeneralNames names = GeneralNames.GetInstance(Asn1Object.FromByteArray(str.GetOctets()));
    Console.WriteLine(names.ToString());
}

static T GetAsn1ObjectRecursive<T>(DerSequence sequence, String id) where T : Asn1Object
{
    if (sequence.OfType<DerObjectIdentifier>().Any(o => o.Id == id))
    {
        return sequence.OfType<T>().First();
    }

    foreach (DerSequence subSequence in sequence.OfType<DerSequence>())
    {
        T value = GetAsn1ObjectRecursive<T>(subSequence, id);
        if (value != default(T))
        {
            return value;
        }
    }

    return default(T);
}

The tricky part is that BouncyCastle works with collection everywhere and the requested value is inside a nested nested collection. I use a recursive function because I'm not sure if your CSR will always have this value as nested.

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