使用公共/专用密钥而不是共享机密的IdentityServer客户端身份验证 [英] IdentityServer client authentication with public/private keys instead of shared secrets

问题描述

我正在尝试使用公钥/私钥，而不是IdentityServer4的客户端机密使用共享机密. 此处记录了这种方法.

I'm trying to use public/private keys instead of a shared secret for client secrets with IdentityServer4. This approach is documented here.

如果它是一个共享机密，则请求将包含纯文本中的secret.例如

If it was a shared secret, the request would contain the secret in plain text. e.g.

curl -X POST \
  http://<identityserver>/connect/token \
  -F client_id=abc \
  -F client_secret=secret \
  -F grant_type=client_credentials \
  -F scope=api1 api2

我的问题是:应使用公钥/私钥身份验证方法作为secret传递什么?

My question is: What should be passed in as the secret with the public/private key authentication method?

为了提供一些背景知识，使用公共/密钥身份验证的客户端将通过以下步骤向IdentityServer 注册

To give some background, a Client using public/key authentication will register with IdentityServer with the following steps

1. 客户端生成一个.crt文件，例如

// create key
$ openssl genrsa -des3 -passout pass:x -out client.pass.key 2048
$ openssl rsa -passin pass:x -in client.pass.key -out client.key

// create certificate request (csr)
$ openssl req -new -key client.key -out client.csr

// create certificate (crt)
$ openssl x509 -req -sha256 -days 365 -in client.csr -signkey client.key -out client.crt

// export pfx file from key and crt
$ openssl pkcs12 -export -out client.pfx -inkey client.key -in client.crt

客户端将与IdentityServer共享client.crt文件

IdentityServer将通过以下方式注册客户端

IdentityServer will register the Client by

var client = new Client
{
    ClientId = "abc",
    ClientSecrets =
    {
        new Secret
        {
            Type = IdentityServerConstants.SecretTypes.X509CertificateBase64,
            Value = "MIIDF...." <================= contents of the crt file
        }
    },

    AllowedGrantTypes = GrantTypes.ClientCredentials,
    AllowedScopes = { "api1", "api2" }
};

推荐答案

这要归功于IdentityServer4中的单元测试！

Figured this out thanks to the unit tests in IdentityServer4!

在使用公共/私人身份验证时，不使用client_secret.而是使用client_assertion，它是JWT令牌.

When using public/private authentication, client_secret is not used. Rather, a client_assertion is used, which is a JWT token.

这是令牌请求的示例代码. client.pfx是从问题中上面的步骤生成的证书捆绑包.

Here is sample code for the token request. client.pfx is the certificate bundle generated from the steps above in the question.

var now = DateTime.UtcNow;
var clientId = "abc";
var tokenEndpoint = "http://localhost:5000/connect/token";

var cert = new X509Certificate2("client.pfx", "1234");

// create client_assertion JWT token
var token = new JwtSecurityToken(
    clientId,
    tokenEndpoint,
    new List<Claim>
    {
        new Claim("jti", Guid.NewGuid().ToString()),
        new Claim(JwtClaimTypes.Subject, clientId),
        new Claim(JwtClaimTypes.IssuedAt, now.ToEpochTime().ToString(), ClaimValueTypes.Integer64)
    },
    now,
    now.AddMinutes(1),
    new SigningCredentials(
        new X509SecurityKey(cert),
        SecurityAlgorithms.RsaSha256
    )
);

var tokenHandler = new JwtSecurityTokenHandler();
var tokenString = tokenHandler.WriteToken(token);


// token request - note there's no client_secret but a client_assertion which contains the token above
var requestBody = new FormUrlEncodedContent(new Dictionary<string, string>
{
    {"client_id", clientId},
    {"client_assertion_type", "urn:ietf:params:oauth:client-assertion-type:jwt-bearer"},
    {"client_assertion", tokenString},
    {"grant_type", "client_credentials"},
    {"scope", "api1 api2"}
});


var client = new HttpClient();
var response = await client.PostAsync(tokenEndpoint, requestBody);
var tokenRespone = new TokenResponse(await response.Content.ReadAsStringAsync());

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