如何验证来自不同发行者的 jwt 令牌

我正在使用可操作的消息（通过 Outlook Web 应用程序）来调用逻辑应用程序。因此我在请求中得到了一个不记名令牌：

“操作-授权”：“承载者eyJ0eXAi...”

调用堆栈：Outlook web app -> Logic App -> my endpoint hosted in azure

现在我尝试使用 jwt.io 验证令牌，但收到签名无效的问题。 所以我尝试用 c# 来验证它JwtSecurityTokenHandler.

我尝试添加https://substrate.office.com/sts/到发行人列表，但似乎验证甚至没有到达那里。

我使用以下代码来验证 Office.com 颁发的 jwt 令牌：

bool IsAuthorized(HttpActionContext actionContext)
        {
            var valid = base.IsAuthorized(actionContext);

            // Custom handle for Bearer token, when invalid from base-class
            if (!valid && actionContext.Request.Headers.Authorization.Scheme == "Bearer")
            {
                var jwt = actionContext.Request.Headers.Authorization.Parameter;
                var th = new JwtSecurityTokenHandler();
                var sjwt = th.ReadToken(jwt) as JwtSecurityToken;                

                var validationParameters = new TokenValidationParameters
                {
                    ValidateIssuerSigningKey = false,
                    //IssuerSigningToken = sjwt,
                    ValidateActor = false,
                    ValidateAudience = false,
                    ValidateIssuer = true,
                    ValidateLifetime = true,
                    ValidIssuers = new[] { "https://substrate.office.com/sts/" },
                    ValidAudiences = new[] {"https://XXX.logic.azure.com"}
        };

                SecurityToken validatedToken;
                try
                {
                    th.ValidateToken(jwt, validationParameters, out validatedToken);
                }
                catch (Exception ex)
                {
                    return false;
                }
            }

            return valid;
        }

这是我的 JWT 令牌：

我收到异常：

IDX10500: Signature validation failed. Unable to resolve SecurityKeyIdentifier: 'SecurityKeyIdentifier
    (
    IsReadOnly = False,
    Count = 2,
    Clause[0] = X509ThumbprintKeyIdentifierClause(Hash = 0x818...),
    Clause[1] = System.IdentityModel.Tokens.NamedKeySecurityKeyIdentifierClause
    )
', ...

尽管我设定了ValidateIssuerSigningKey = false.

有没有办法接受https://substrate.office.com/sts/作为有效的发行人？

异常表明“签名验证失败”。 为了解决这个问题，我们不能仅仅将想要的有效发行人添加到ValidIssuers，我们需要验证令牌是否是由发行者本身发行的。

特别是对于这种情况，office.com 是发行者，我在这里找到了预期的密钥（JWK - JSON Web Key）：https://substrate.office.com/sts/common/discovery/keys https://substrate.office.com/sts/common/discovery/keys (also https://substrate.office.com/sts/common/.well-known/openid-configuration https://substrate.office.com/sts/common/.well-known/openid-configuration)

这是工作代码：

bool IsAuthorized(HttpActionContext actionContext)
        {
            var valid = base.IsAuthorized(actionContext);

            // Custom handle for Bearer token, when invalid from base-class
            if (!valid && actionContext.Request.Headers.Authorization.Scheme == "Bearer")
            {
                var jwt = actionContext.Request.Headers.Authorization.Parameter;
                var th = new JwtSecurityTokenHandler();

                var validationParameters = new TokenValidationParameters
                {
                    ValidateAudience = false,
                    ValidateLifetime = true,
                    ValidateIssuer = true,
                    ValidateIssuerSigningKey = true,
                    IssuerSigningKey = new JsonWebKey(GetJWK()),
                    ValidIssuers = new[] { "https://substrate.office.com/sts/" }
                };

                Microsoft.IdentityModel.Tokens.SecurityToken validatedToken;
                try
                {
                    var claims = th.ValidateToken(jwt, validationParameters, out validatedToken);
                    valid = true;
                }
                catch (Exception ex)
                {
                    valid = false;
                }
            }

            return valid;
        }

        // Get the token from configuration
        private string GetJWK()
        {
            return ConfigurationManager.AppSettings["ida:jwks_json"];
        }

在应用程序设置中，我将来自网站的 RSA 密钥用于验证令牌，它看起来像：

{"kty":"RSA","use":"sig","kid":"gY...","x5t":"gY...","n":"2w...","e":"AQAB","x5c":["MII..."]}