Question

我想在我的API上的承载标头中验证来自Okta的JWT访问令牌，但验证始终无法给出以下错误：

2016-12-16 10:12:30.451 +00:00 [Information] Failed to validate the token "eyJhbGciOiJSUzI1NiIsImtpZCI6Il95EVnTTc3MkRHSFdtV19ETDNJYUUyNlUifQ.eFULi1ET2htZFhUalFmcmV5bHdaZkI5aFVobFJ5VlRTenRvRTc1cHVSNUYwUlEiLCJpc3MiOLCJjaWQiOiJZTFpSUUZoWEY1RlpTd2xrbDlwVCIsInVpZCI6IjAwdTkxYXdpZmthZzZYcFE5MGg3Iiwic2NwIjpbIm9wZW5pZCIsInByb2ZpbGUiXX0.K50-cdNI1_m1GLglguCvpiinhxKYNwy0ieAABP7lfO2briaT29mzPeQx07a8F_CyJtQbEtOsPkYviCSK309m8n70WoM51B7FxYTebAxIvWZNrdB_Nsid4YrQHoOoM5b54Fzr4FE-7510TJxvKPg8lWViTQG5cfijE6AL-JXuPYlmdikByZbLwg57P4sUBWByF-pTcRqE2l03VOdkyQOJJ4v22jSUSgKFSYdaXH4ufFt2iTv_sbnNTTtXz4tKLLgfzsKZuxo7-N6-QB7Zuhn7g".
Microsoft.IdentityModel.Tokens.SecurityTokenSignatureKeyNotFoundException: IDX10501: Signature validation failed. Unable to match 'kid': '_yomDqFziFzjpiI-OZmeDEgM772DGHWmW_DL3IaE26U', 
token: '{"alg":"RS256","typ":"JWT","kid":"_yomDqFziFzjpiI-OZmeDEgM772DGHWmW_DL3IaE26U"}.{"ver":1,"jti":"AT.-DOhmdXTjQfreylwZfB9hUhlRyVTSztoE75puR5F0RQ","iss":"https://dev-606497.oktapreview.com","aud":"https://dev-606497.oktapreview.com","sub":"myemail@email.com","iat":1481883065,"exp":1481886665,"cid":"YLZRQFhXF5FZSwlkl9pT","uid":"00u91awifkag6XpQ90h7","scp":["openid","profile"]}'.
   at System.IdentityModel.Tokens.Jwt.JwtSecurityTokenHandler.ValidateSignature(String token, TokenValidationParameters validationParameters)
   at System.IdentityModel.Tokens.Jwt.JwtSecurityTokenHandler.ValidateToken(String token, TokenValidationParameters validationParameters, SecurityToken& validatedToken)
   at Microsoft.AspNetCore.Authentication.JwtBearer.JwtBearerHandler.<HandleAuthenticateAsync>d__1.MoveNext()

我想知道原因是否可以，令牌中的公钥'kid'与Okta上的Keys端点中的公钥不同？

{"keys": [{"alg": "RS256","e": "AQAB","n": "wtkBXocJLBE-ArN56pLzSiR3x2w99R2d_rlCpFN__3k1I6P0vcfE4SKwoafzucaG-kEwy9pn4p49z0O24UHX0NmdxOMhyFmJsfss0tK0AkBhXB-e9kk5r316ePRtb7eo8uAnjNP7w2T6sSqwdppw7I8NQa4KrFIYFVDx4xDcYMfnGrKjKFdghxSpG2dP7vcQsjJHkMyEHYj7nTTyplReX21_Et2F5zHqvqQZ1JRuL_Ol-JrSEeM0Hznpb7kpggnFUA_xnzcR4AhT5P2WNNNenlfurjM_AN1ymV8DT04Tx7tp6G60N1AkDw4t4Q0LfuevQ","kid": "gtUiz-YdlCSRpr0Ue7LRuEtqgVqRmDWpe5ZuvBaWgVk","kty": "RSA","use": "sig"}]}

这是WebAPI上的设置：

app.UseJwtBearerAuthentication(new JwtBearerOptions
{
    AuthenticationScheme = JwtBearerDefaults.AuthenticationScheme,
    Audience = "http://api.azurewebsites.net",
    Authority = "https://dev-606497.oktapreview.com"
});

Answer 1

为了通过公钥url获取访问令牌的密钥，需要为您的Okta组织启用一些功能。请发送电子邮件至developers@okta.com

Answer 2

您是正确的 - 孩子与公钥不同 - 它是密钥ID ，用于标识要在Keys响应中使用的公钥。如果我们查看response example的v1 / keys：

"keys": [
  {
    "alg": "RS256",
    "e": "AQAB",
    "n": "iKqiD4cr7FZKm6f05K4r-GQOvjRqjOeFmOho9V7SAXYwCyJluaGBLVvDWO1XlduPLOrsG_Wgs67SOG5qeLPR8T1zDK4bfJAo1Tvbw
          YeTwVSfd_0mzRq8WaVc_2JtEK7J-4Z0MdVm_dJmcMHVfDziCRohSZthN__WM2NwGnbewWnla0wpEsU3QMZ05_OxvbBdQZaDUsNSx4
          6is29eCdYwhkAfFd_cFRq3DixLEYUsRwmOqwABwwDjBTNvgZOomrtD8BRFWSTlwsbrNZtJMYU33wuLO9ynFkZnY6qRKVHr3YToIrq
          NBXw0RWCheTouQ-snfAB6wcE2WDN3N5z760ejqQ",
    "kid": "U5R8cHbGw445Qbq8zVO1PcCpXL8yG6IcovVa3laCoxM",
    "kty": "RSA",
    "use": "sig"
  },
  ... more
]

我们可以看到有一个 kid 属性 - 如果您手动执行此操作，则必须迭代键才能找到与 kid 匹配的键 strong>在您的/令牌响应中，并在JWT验证中使用它。

有几个示例在ASP.net中演示了此验证流程 - 例如，here's the relevant code中的Authorization Code flow sample。

查看我们的Validating Access Tokens文档以获得对流程的更全面了解也很有帮助。

更新：注意到您尝试查找的小孩不在密钥响应中 - 这是为通过OIDC返回的访问令牌设计的（它们是不透明的）。这里有几个选项：

如果是OpenId Connect，则必须通过/userinfo endpoint
或者，如果您正在查看API Access Management，您需要联系developers@okta.com为您启用该功能（如Sohaib建议的那样）。这将通过密钥端点公开访问令牌的公钥。

AspNetCore中的Okta OAuth2令牌验证失败

2 个答案: