使用 public/private 密钥而不是共享密钥的 IdentityServer 客户端身份验证

Question

我正在尝试使用 public/private 密钥而不是 IdentityServer4 的客户端机密的共享机密。这种方法已记录 here。

如果它是共享机密，请求将以纯文本形式包含 secret。例如

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：使用 public/private 密钥验证方法应该作为 secret 传递什么？

为了提供一些背景信息，使用 public/key 身份验证的客户端将通过以下步骤向 IdentityServer 注册

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

client.crt

IdentityServer 将通过

注册客户端

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" }
};

Answer 1

我认为它必须是签名的 JWT。查看 IDS4 代码库中的 PrivateKeyJwtSecretValidator class：

https://github.com/IdentityServer/IdentityServer4/blob/2.1.3/src/IdentityServer4/Validation/PrivateKeyJwtSecretValidator.cs

Answer 2

感谢 IdentityServer4 中的单元测试！

使用public/private认证时，不使用client_secret。相反，使用了 client_assertion，这是一个 JWT 令牌。

这是令牌请求的示例代码。 client.pfx 是问题中上述步骤生成的证书包。

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());

使用 public/private 密钥而不是共享密钥的 IdentityServer 客户端身份验证

IdentityServer client authentication with public/private keys instead of shared secrets

c#

identityserver3

asp.net-core

identityserver4