ASP.NET Core 3-Azure Active Directory-令牌验证失败-签名验证失败。无法匹配密钥

Question

这是ASP操作之一：

[HttpGet]
[Route("GetArticles")]
public async Task<JsonResult> GetArticles()
{
    if (!Request.Headers.TryGetValue("Authorization", out var authorizationToken))
    {
        return Json(Unauthorized());
    }

    if (!authorizationToken.Any())
    {
        return Json(Unauthorized());
    }
    
    var jwt = await Validate(authorizationToken.First());

    return Json(await _unitOfWork.ArticlesRepos.GetAllAsync());
}

传递令牌并触发验证。验证在Validate方法中：

public async Task<JwtSecurityToken> Validate(string token)
{
    string tenant = _configuration.GetValue<string>("Tenant");
    string publicKey = _configuration.GetValue<string>("AadPubKey");
    //string stsDiscoveryEndpoint = $"https://login.microsoftonline.com/common/v2.0/.well-known/openid-configuration";
    //string stsDiscoveryEndpoint = $"https://login.microsoftonline.com/{tenant}/oauth2/v2.0/token";
    string stsDiscoveryEndpoint = $"https://login.microsoftonline.com/{tenant}/v2.0/.well-known/openid-configuration";
    
    ConfigurationManager<OpenIdConnectConfiguration> configManager = new ConfigurationManager<OpenIdConnectConfiguration>(stsDiscoveryEndpoint, new OpenIdConnectConfigurationRetriever());

    OpenIdConnectConfiguration config = await configManager.GetConfigurationAsync();
    var IssuerSigningKeys = config.SigningKeys;

    var x = new X509Certificate2(Encoding.ASCII.GetBytes(publicKey));
    var y = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(publicKey));
    var rsa = new RSACryptoServiceProvider();
    string exponentvalue = "AQAB";
    var e = Base64UrlEncoder.DecodeBytes(exponentvalue);
    var N = publicKey;
    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 = true,
        ValidIssuer = stsDiscoveryEndpoint,
        //ValidIssuer = "https://localhost:44350/",
        //ValidAudience = "https://localhost:44395/",
        ValidateIssuerSigningKey = true,
        IssuerSigningKey = signingKey,
        ValidateLifetime = false
    };

    JwtSecurityTokenHandler tokendHandler = new JwtSecurityTokenHandler();

    var result = tokendHandler.ValidateToken(token, validationParameters, out SecurityToken jwt);

    return jwt as JwtSecurityToken;
}

如你所见，我们尝试了不同的方法。我们在行中出现了以下错误

{"keys":
[{"kty":"RSA"
,"use":"sig"
,"kid":"someId"
,"x5t":"someId"
,"n":"longString"
,"e":"AQAB"
,"x5c":["otherLongString"]
,"issuer":"https://login.microsoftonline.com/myTenant/v2.0"},
{...},{...}]

提前致谢

Answer 1

使用SymmetricSecurityKey从RS256算法获取IDX10634错误看起来像是在较新版本的IdentityModel中已修复的行为。您使用的是哪个版本的IdentityModel程序集？请尝试更新到最新版本（当前为6.7.1)，看看您的问题是否仍然存在。

作为一些附带说明：

JwtSecurityTokenHandler/TokenValidationParameters是长期生存的对象。例如，TokenValidationParameters有一个缓存，可在重用时加以利用。