问题描述
我正在Net Core WebApi应用程序中使用以下代码，并且运行良好.
I'm using the code below in a Net Core WebApi app and it's working well.
我可以解码它产生的JWT，但是我也想验证它的签名.但是，我从哪里获得验证密钥?
I can decode the JWT that it produces, but I would also like to verify it's signature. But, where do I get the key to verify it with?
tenant = Configuration.GetSection("AzureAD:Tenant").Value;
Logger.AppLogDebug("tenat value found: [{0}]", tenant);
azureAdInstance = Configuration.GetSection("AzureAD:AzureADInstance").Value;
Logger.AppLogDebug("azureAdInstance value found: [{0}]", azureAdInstance);
audience = Configuration.GetSection("AzureAD:Audience").Value;
Logger.AppLogDebug("Audience value found: [{0}]", audience);
var authority = $"{azureAdInstance}{tenant}";
Logger.AppLogDebug("authority value set to: [{0}]", authority);
var authContext = new AuthenticationContext(authority);
var clientCredential = new ClientCredential(key, secret);
var token = authContext.AcquireTokenAsync(audience, clientCredential).Result.AccessToken;
return new ObjectResult($"Bearer {token}");
推荐答案
您可以使用JwtBearer或AddAzureADBearer中间件来验证访问令牌.这样，当接收到来自客户端的请求时，您的Web api将自动解码令牌并验证签名.您可以参考以下链接，了解如何使用两种中间件:
You can use JwtBearer or AddAzureADBearer middleware to validate the access token . So that when receiving request form client , your web api will automatically decode token and verify the signature . You can refer to below link for how to use the two middlewares :
https://stackoverflow.com/a/57619013/5751404
如果要手动验证jwt令牌，则在验证访问令牌的签名时，应该获取公共密钥，因为Azure AD可以使用一组特定的公共-私有密钥对中的任何一个对令牌进行签名，因此这些密钥可以在以下位置找到:
If you want to manually verify the jwt token , When validating the signature of access token , you should get the public key since Azure AD may sign token using any one of a certain set of public-private key pairs , the keys could be found at :
https://login.microsoftonline.com/{tenant}/.well-known/openid-configuration
在JSON响应中，您将看到属性jwks_uri，该属性是URI，其中包含Azure AD的JSON Web密钥集.匹配jwt令牌中的kid声明，您可以找到AAD用于通过非对称加密算法(默认情况下为RSA 256)对令牌进行签名的密钥.
Within the JSON response, you’ll see a property jwks_uri which is the URI that contains the JSON Web Key Set for Azure AD. Matching the kid claim in jwt token , you can find the key which AAD used to sign the token with asymmetric encryption algorithms, such as RSA 256 by default .
然后您可以使用:
public JwtSecurityToken validate(string token,string key){
var rsa = new RSACryptoServiceProvider();
string exponentvalue = "AQAB";
var e = Base64UrlEncoder.DecodeBytes(exponentvalue);
var N = key;
var modulus = Base64UrlEncoder.DecodeBytes(N);
rsa.ImportParameters(
new RSAParameters()
{
Modulus = modulus,
Exponent = e
});
var signingKey = new RsaSecurityKey(rsa);
TokenValidationParameters validationParameters = new TokenValidationParameters
{
ValidateAudience = false,
ValidateIssuer = false,
ValidateIssuerSigningKey = true,
IssuerSigningKey = signingKey,
ValidateLifetime = false
};
JwtSecurityTokenHandler tokendHandler = new JwtSecurityTokenHandler();
SecurityToken jwt;
var result = tokendHandler.ValidateToken(token, validationParameters, out jwt);
return jwt as JwtSecurityToken;
}
我还没有测试上面的代码，但是您可以尝试从上面开始.
I haven't test above codes but you can try and start with that .
此外，您正在使用客户端凭证流来获取特定资源的令牌.如果资源是Microsoft hosted apis，例如Microsoft Graph API，Azure Management API等.您无需在应用程序中验证访问令牌.将带有令牌的请求发送到Microsoft托管的api时，它将为您验证令牌.
In addition , you are using client credential flow to acquiring token for specific resource . If the resource is the Microsoft hosted apis such as Microsoft Graph API, Azure Management API etc.. You don't need to validate the access token in your application . When sending request with token to Microsoft hosted apis , it will validate the tokens for you .
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