IdentityServer4源码解析_2_元数据接口
目录
- IdentityServer4源码解析_1_项目结构
- IdentityServer4源码解析_2_元数据接口
- IdentityServer4源码解析_3_认证接口
- IdentityServer4源码解析_4_令牌发放接口
- IdentityServer4源码解析_5_查询用户信息接口
- [IdentityServer4源码解析_6_结束会话接口]
- [IdentityServer4源码解析_7_查询令牌信息接口]
- [IdentityServer4源码解析_8_撤销令牌接口]
协议
这一系列我们都采用这样的方式，先大概看下协议，也就是需求描述，然后看idsv4怎么实现的，这样可以加深理解。
元数据接口的协议地址如下：
摘要
该协议定义了一套标准，用户能够获取到oidc服务的基本信息，包括OAuth2.0相关接口地址。
Webfinger - 网络指纹
先了解一下Webfinger这个概念。
WebFinger可以翻译成网络指纹，它定义了一套标准，描述如何通过标准的HTTP方法去获取网络实体的资料信息。WebFinger使用JSON来描述实体信息。
查询oidc服务元数据 - OpenID Provider Issuer Discovery
可选协议。
定义了如何获取oidc服务元数据。如果客户端明确知道oidc服务的地址，可以跳过此部分。
个人理解是存在多个oidc服务的情况，可以部署一个webfinger服务，根据资源请求，路由到不同的oidc服务。
通常来说，我们只有一个oidc服务，我看了一下idsv4也没有实现这一部分协议，这里了解一下就可以了。
查询oidc服务配置信息 - OpenID Provider Configuration Request
必选协议。
用于描述oidc服务各接口地址及其他配置信息。
GET /.well-known/openid-configuration HTTP/1.1
Host: example.com
必须校验issuer与请求地址是否一致
启个idsrv服务调用试一下，返回结果如图
详细信息如下。
{
"issuer": "https://localhost:10000", //颁发者地址
"jwks_uri": "https://localhost:10000/.well-known/openid-configuration/jwks", //jwks接口地址，查询密钥
"authorization_endpoint": "https://localhost:10000/connect/authorize", //认证接口地址
"token_endpoint": "https://localhost:10000/connect/token", //令牌发放接口
"userinfo_endpoint": "https://localhost:10000/connect/userinfo", //查询用户信息接口
"end_session_endpoint": "https://localhost:10000/connect/endsession", //结束会话接口
"check_session_iframe": "https://localhost:10000/connect/checksession", //检查会话接口
"revocation_endpoint": "https://localhost:10000/connect/revocation", //撤销令牌接口
"introspection_endpoint": "https://localhost:10000/connect/introspect", //查询令牌详情接口
"device_authorization_endpoint": "https://localhost:10000/connect/deviceauthorization", //设备认证接口
"frontchannel_logout_supported": true, //是否支持前端登出
"frontchannel_logout_session_supported": true, //是否支持前端结束会话
"backchannel_logout_supported": true, //是否支持后端登出
"backchannel_logout_session_supported": true, //是否支持后端结束会话
"scopes_supported": [ //支持的授权范围,scope
"openid",
"profile",
"userid",
"username",
"email",
"mobile",
"api",
"offline_access" //token过期可用refresh_token刷新换取新token
],
"claims_supported": [ //支持的声明
"sub",
"updated_at",
"locale",
"zoneinfo",
"birthdate",
"gender",
"preferred_username",
"picture",
"profile",
"nickname",
"middle_name",
"given_name",
"family_name",
"website",
"name",
"userid",
"username",
"email",
"mobile"
],
"grant_types_supported": [ //支持的认证类型
"authorization_code", //授权码模式
"client_credentials", //客户端密钥模式
"refresh_token", //刷新token
"implicit", //隐式流程, 一般用于单页应用javascript客户端
"password", //用户名密码模式
"urn:ietf:params:oauth:grant-type:device_code" //设备授权码
],
"response_types_supported": [ //支持的返回类型
"code", //授权码
"token", //通行令牌
"id_token", //身份令牌
"id_token token", //身份令牌+统通行令牌
"code id_token", //授权码+身份令牌
"code token", //授权码+通行令牌
"code id_token token" //授权码+身份令牌+通行令牌
],
"response_modes_supported": [ //支持的响应方法
"form_post", //form-post提交
"query", //get提交
"fragment" //fragment提交
],
"token_endpoint_auth_methods_supported": [ //发放令牌接口支持的认证方式
"client_secret_basic", //basic
"client_secret_post" //post
],
"id_token_signing_alg_values_supported": [ //身份令牌加密算法
"RS256"
],
"subject_types_supported": [
"public"
],
"code_challenge_methods_supported": [
"plain",
"S256"
],
"request_parameter_supported": true
}
JWK - Json Web Keys
idsv还注入这样一个接口：DiscoveryKeyEndpoint，尝试发现返回了一组密钥。协议内容如下。
GET /.well-known/openid-configuration/jwks，返回结果如下
{
"keys": [
{
"kty": "RSA",
"use": "sig",
"kid": "LS-EQOr-3BkalkkUVh8q7Q",
"e": "AQAB",
"n": "08BLLaTz4JrTYmE4bZ9c7oKVrZKLy3KfGT5mmnslhl41nk_EV_8OUdL8wMXunC2KERdnsy5XYk4aw3LlvxZDIvjxO9PEblPsoap-WErdi9GVyAv-NJ6eJQy3S7FRSkvzQYBsLnCKm5wu0kjdQBVUCFJ7wfiZ9ayY7pH7K10qN2Utvt-qsCLUy0cJ0StuP_rquefp7_XhUw3A8IIA8P6DjfZIbpwrVjOeVWoI_ZKIwfxShghOAKBDLyQuC2PhozsqZ7HvGEeAPm06YPMWQVbE9_LBn2j_Ul_VBUWc9KfBNOzk_BMQHyF2NUlwMtqMUEcwK_hpjEeo62O_aFT8EDkgcQ",
"alg": "RS256"
},
{
"kty": "RSA",
"use": "sig",
"kid": "LS-EQOr-3BkalkkUVh8q7Q",
"e": "AQAB",
"n": "08BLLaTz4JrTYmE4bZ9c7oKVrZKLy3KfGT5mmnslhl41nk_EV_8OUdL8wMXunC2KERdnsy5XYk4aw3LlvxZDIvjxO9PEblPsoap-WErdi9GVyAv-NJ6eJQy3S7FRSkvzQYBsLnCKm5wu0kjdQBVUCFJ7wfiZ9ayY7pH7K10qN2Utvt-qsCLUy0cJ0StuP_rquefp7_XhUw3A8IIA8P6DjfZIbpwrVjOeVWoI_ZKIwfxShghOAKBDLyQuC2PhozsqZ7HvGEeAPm06YPMWQVbE9_LBn2j_Ul_VBUWc9KfBNOzk_BMQHyF2NUlwMtqMUEcwK_hpjEeo62O_aFT8EDkgcQ",
"alg": "RS256"
}
]
}
源码解析
接口地址都在Constants.cs这个文件，ProtocalRoutePaths这个类里面定义的。现在知道为什么接口地址是.well-known/openid-configuration这样奇怪的一个路由了，这是oidc协议定的（对，都是产品的锅）。
oidc服务配置信息接口 - DiscoveryEndpoint
代码很长，但是逻辑很简单，就是组装协议规定的所有地址和信息。
需要注意的支持的claims、支持的scope等信息是遍历所有IdentityResource、ApiResource动态获取的。
基本上每个接口都可以配置是否显示在元数据文档中。
public async Task<IEndpointResult> ProcessAsync(HttpContext context)
{
_logger.LogTrace("Processing discovery request.");
// validate HTTP
if (!HttpMethods.IsGet(context.Request.Method))
{
_logger.LogWarning("Discovery endpoint only supports GET requests");
return new StatusCodeResult(HttpStatusCode.MethodNotAllowed);
}
_logger.LogDebug("Start discovery request");
if (!_options.Endpoints.EnableDiscoveryEndpoint)
{
_logger.LogInformation("Discovery endpoint disabled. 404.");
return new StatusCodeResult(HttpStatusCode.NotFound);
}
var baseUrl = context.GetIdentityServerBaseUrl().EnsureTrailingSlash();
var issuerUri = context.GetIdentityServerIssuerUri();
// generate response
_logger.LogTrace("Calling into discovery response generator: {type}", _responseGenerator.GetType().FullName);
var response = await _responseGenerator.CreateDiscoveryDocumentAsync(baseUrl, issuerUri);
return new DiscoveryDocumentResult(response, _options.Discovery.ResponseCacheInterval);
}
/// <summary>
/// Creates the discovery document.
/// </summary>
/// <param name="baseUrl">The base URL.</param>
/// <param name="issuerUri">The issuer URI.</param>
public virtual async Task<Dictionary<string, object>> CreateDiscoveryDocumentAsync(string baseUrl, string issuerUri)
{
var entries = new Dictionary<string, object>
{
{ OidcConstants.Discovery.Issuer, issuerUri }
};
// jwks
if (Options.Discovery.ShowKeySet)
{
if ((await Keys.GetValidationKeysAsync()).Any())
{
entries.Add(OidcConstants.Discovery.JwksUri, baseUrl + Constants.ProtocolRoutePaths.DiscoveryWebKeys);
}
}
// endpoints
if (Options.Discovery.ShowEndpoints)
{
if (Options.Endpoints.EnableAuthorizeEndpoint)
{
entries.Add(OidcConstants.Discovery.AuthorizationEndpoint, baseUrl + Constants.ProtocolRoutePaths.Authorize);
}
if (Options.Endpoints.EnableTokenEndpoint)
{
entries.Add(OidcConstants.Discovery.TokenEndpoint, baseUrl + Constants.ProtocolRoutePaths.Token);
}
if (Options.Endpoints.EnableUserInfoEndpoint)
{
entries.Add(OidcConstants.Discovery.UserInfoEndpoint, baseUrl + Constants.ProtocolRoutePaths.UserInfo);
}
if (Options.Endpoints.EnableEndSessionEndpoint)
{
entries.Add(OidcConstants.Discovery.EndSessionEndpoint, baseUrl + Constants.ProtocolRoutePaths.EndSession);
}
if (Options.Endpoints.EnableCheckSessionEndpoint)
{
entries.Add(OidcConstants.Discovery.CheckSessionIframe, baseUrl + Constants.ProtocolRoutePaths.CheckSession);
}
if (Options.Endpoints.EnableTokenRevocationEndpoint)
{
entries.Add(OidcConstants.Discovery.RevocationEndpoint, baseUrl + Constants.ProtocolRoutePaths.Revocation);
}
if (Options.Endpoints.EnableIntrospectionEndpoint)
{
entries.Add(OidcConstants.Discovery.IntrospectionEndpoint, baseUrl + Constants.ProtocolRoutePaths.Introspection);
}
if (Options.Endpoints.EnableDeviceAuthorizationEndpoint)
{
entries.Add(OidcConstants.Discovery.DeviceAuthorizationEndpoint, baseUrl + Constants.ProtocolRoutePaths.DeviceAuthorization);
}
if (Options.MutualTls.Enabled)
{
var mtlsEndpoints = new Dictionary<string, string>();
if (Options.Endpoints.EnableTokenEndpoint)
{
mtlsEndpoints.Add(OidcConstants.Discovery.TokenEndpoint, baseUrl + Constants.ProtocolRoutePaths.MtlsToken);
}
if (Options.Endpoints.EnableTokenRevocationEndpoint)
{
mtlsEndpoints.Add(OidcConstants.Discovery.RevocationEndpoint, baseUrl + Constants.ProtocolRoutePaths.MtlsRevocation);
}
if (Options.Endpoints.EnableIntrospectionEndpoint)
{
mtlsEndpoints.Add(OidcConstants.Discovery.IntrospectionEndpoint, baseUrl + Constants.ProtocolRoutePaths.MtlsIntrospection);
}
if (Options.Endpoints.EnableDeviceAuthorizationEndpoint)
{
mtlsEndpoints.Add(OidcConstants.Discovery.DeviceAuthorizationEndpoint, baseUrl + Constants.ProtocolRoutePaths.MtlsDeviceAuthorization);
}
if (mtlsEndpoints.Any())
{
entries.Add(OidcConstants.Discovery.MtlsEndpointAliases, mtlsEndpoints);
}
}
}
// logout
if (Options.Endpoints.EnableEndSessionEndpoint)
{
entries.Add(OidcConstants.Discovery.FrontChannelLogoutSupported, true);
entries.Add(OidcConstants.Discovery.FrontChannelLogoutSessionSupported, true);
entries.Add(OidcConstants.Discovery.BackChannelLogoutSupported, true);
entries.Add(OidcConstants.Discovery.BackChannelLogoutSessionSupported, true);
}
// scopes and claims
if (Options.Discovery.ShowIdentityScopes ||
Options.Discovery.ShowApiScopes ||
Options.Discovery.ShowClaims)
{
var resources = await ResourceStore.GetAllEnabledResourcesAsync();
var scopes = new List<string>();
// scopes
if (Options.Discovery.ShowIdentityScopes)
{
scopes.AddRange(resources.IdentityResources.Where(x => x.ShowInDiscoveryDocument).Select(x => x.Name));
}
if (Options.Discovery.ShowApiScopes)
{
var apiScopes = from api in resources.ApiResources
from scope in api.Scopes
where scope.ShowInDiscoveryDocument
select scope.Name;
scopes.AddRange(apiScopes);
scopes.Add(IdentityServerConstants.StandardScopes.OfflineAccess);
}
if (scopes.Any())
{
entries.Add(OidcConstants.Discovery.ScopesSupported, scopes.ToArray());
}
// claims
if (Options.Discovery.ShowClaims)
{
var claims = new List<string>();
// add non-hidden identity scopes related claims
claims.AddRange(resources.IdentityResources.Where(x => x.ShowInDiscoveryDocument).SelectMany(x => x.UserClaims));
// add non-hidden api scopes related claims
foreach (var resource in resources.ApiResources)
{
claims.AddRange(resource.UserClaims);
foreach (var scope in resource.Scopes)
{
if (scope.ShowInDiscoveryDocument)
{
claims.AddRange(scope.UserClaims);
}
}
}
entries.Add(OidcConstants.Discovery.ClaimsSupported, claims.Distinct().ToArray());
}
}
// grant types
if (Options.Discovery.ShowGrantTypes)
{
var standardGrantTypes = new List<string>
{
OidcConstants.GrantTypes.AuthorizationCode,
OidcConstants.GrantTypes.ClientCredentials,
OidcConstants.GrantTypes.RefreshToken,
OidcConstants.GrantTypes.Implicit
};
if (!(ResourceOwnerValidator is NotSupportedResourceOwnerPasswordValidator))
{
standardGrantTypes.Add(OidcConstants.GrantTypes.Password);
}
if (Options.Endpoints.EnableDeviceAuthorizationEndpoint)
{
standardGrantTypes.Add(OidcConstants.GrantTypes.DeviceCode);
}
var showGrantTypes = new List<string>(standardGrantTypes);
if (Options.Discovery.ShowExtensionGrantTypes)
{
showGrantTypes.AddRange(ExtensionGrants.GetAvailableGrantTypes());
}
entries.Add(OidcConstants.Discovery.GrantTypesSupported, showGrantTypes.ToArray());
}
// response types
if (Options.Discovery.ShowResponseTypes)
{
entries.Add(OidcConstants.Discovery.ResponseTypesSupported, Constants.SupportedResponseTypes.ToArray());
}
// response modes
if (Options.Discovery.ShowResponseModes)
{
entries.Add(OidcConstants.Discovery.ResponseModesSupported, Constants.SupportedResponseModes.ToArray());
}
// misc
if (Options.Discovery.ShowTokenEndpointAuthenticationMethods)
{
var types = SecretParsers.GetAvailableAuthenticationMethods().ToList();
if (Options.MutualTls.Enabled)
{
types.Add(OidcConstants.EndpointAuthenticationMethods.TlsClientAuth);
types.Add(OidcConstants.EndpointAuthenticationMethods.SelfSignedTlsClientAuth);
}
entries.Add(OidcConstants.Discovery.TokenEndpointAuthenticationMethodsSupported, types);
}
var signingCredentials = await Keys.GetSigningCredentialsAsync();
if (signingCredentials != null)
{
var algorithm = signingCredentials.Algorithm;
entries.Add(OidcConstants.Discovery.IdTokenSigningAlgorithmsSupported, new[] { algorithm });
}
entries.Add(OidcConstants.Discovery.SubjectTypesSupported, new[] { "public" });
entries.Add(OidcConstants.Discovery.CodeChallengeMethodsSupported, new[] { OidcConstants.CodeChallengeMethods.Plain, OidcConstants.CodeChallengeMethods.Sha256 });
if (Options.Endpoints.EnableAuthorizeEndpoint)
{
entries.Add(OidcConstants.Discovery.RequestParameterSupported, true);
if (Options.Endpoints.EnableJwtRequestUri)
{
entries.Add(OidcConstants.Discovery.RequestUriParameterSupported, true);
}
}
if (Options.MutualTls.Enabled)
{
entries.Add(OidcConstants.Discovery.TlsClientCertificateBoundAccessTokens, true);
}
// custom entries
if (!Options.Discovery.CustomEntries.IsNullOrEmpty())
{
foreach (var customEntry in Options.Discovery.CustomEntries)
{
if (entries.ContainsKey(customEntry.Key))
{
Logger.LogError("Discovery custom entry {key} cannot be added, because it already exists.", customEntry.Key);
}
else
{
if (customEntry.Value is string customValueString)
{
if (customValueString.StartsWith("~/") && Options.Discovery.ExpandRelativePathsInCustomEntries)
{
entries.Add(customEntry.Key, baseUrl + customValueString.Substring(2));
continue;
}
}
entries.Add(customEntry.Key, customEntry.Value);
}
}
}
return entries;
}
然后是jwks描述信息的代码。关于加密的信息也是根据配置的SecuritKey去动态返回的。
public virtual async Task<IEnumerable<Models.JsonWebKey>> CreateJwkDocumentAsync()
{
var webKeys = new List<Models.JsonWebKey>();
foreach (var key in await Keys.GetValidationKeysAsync())
{
if (key.Key is X509SecurityKey x509Key)
{
var cert64 = Convert.ToBase64String(x509Key.Certificate.RawData);
var thumbprint = Base64Url.Encode(x509Key.Certificate.GetCertHash());
if (x509Key.PublicKey is RSA rsa)
{
var parameters = rsa.ExportParameters(false);
var exponent = Base64Url.Encode(parameters.Exponent);
var modulus = Base64Url.Encode(parameters.Modulus);
var rsaJsonWebKey = new Models.JsonWebKey
{
kty = "RSA",
use = "sig",
kid = x509Key.KeyId,
x5t = thumbprint,
e = exponent,
n = modulus,
x5c = new[] { cert64 },
alg = key.SigningAlgorithm
};
webKeys.Add(rsaJsonWebKey);
}
else if (x509Key.PublicKey is ECDsa ecdsa)
{
var parameters = ecdsa.ExportParameters(false);
var x = Base64Url.Encode(parameters.Q.X);
var y = Base64Url.Encode(parameters.Q.Y);
var ecdsaJsonWebKey = new Models.JsonWebKey
{
kty = "EC",
use = "sig",
kid = x509Key.KeyId,
x5t = thumbprint,
x = x,
y = y,
crv = CryptoHelper.GetCrvValueFromCurve(parameters.Curve),
x5c = new[] { cert64 },
alg = key.SigningAlgorithm
};
webKeys.Add(ecdsaJsonWebKey);
}
else
{
throw new InvalidOperationException($"key type: {x509Key.PublicKey.GetType().Name} not supported.");
}
}
else if (key.Key is RsaSecurityKey rsaKey)
{
var parameters = rsaKey.Rsa?.ExportParameters(false) ?? rsaKey.Parameters;
var exponent = Base64Url.Encode(parameters.Exponent);
var modulus = Base64Url.Encode(parameters.Modulus);
var webKey = new Models.JsonWebKey
{
kty = "RSA",
use = "sig",
kid = rsaKey.KeyId,
e = exponent,
n = modulus,
alg = key.SigningAlgorithm
};
webKeys.Add(webKey);
}
else if (key.Key is ECDsaSecurityKey ecdsaKey)
{
var parameters = ecdsaKey.ECDsa.ExportParameters(false);
var x = Base64Url.Encode(parameters.Q.X);
var y = Base64Url.Encode(parameters.Q.Y);
var ecdsaJsonWebKey = new Models.JsonWebKey
{
kty = "EC",
use = "sig",
kid = ecdsaKey.KeyId,
x = x,
y = y,
crv = CryptoHelper.GetCrvValueFromCurve(parameters.Curve),
alg = key.SigningAlgorithm
};
webKeys.Add(ecdsaJsonWebKey);
}
else if (key.Key is JsonWebKey jsonWebKey)
{
var webKey = new Models.JsonWebKey
{
kty = jsonWebKey.Kty,
use = jsonWebKey.Use ?? "sig",
kid = jsonWebKey.Kid,
x5t = jsonWebKey.X5t,
e = jsonWebKey.E,
n = jsonWebKey.N,
x5c = jsonWebKey.X5c?.Count == 0 ? null : jsonWebKey.X5c.ToArray(),
alg = jsonWebKey.Alg,
x = jsonWebKey.X,
y = jsonWebKey.Y
};
webKeys.Add(webKey);
}
}
return webKeys;
}
结语
这一节还是比较好理解的。总而言之就是oidc协议规定了，需要提供GET接口，返回所有接口的地址，以及相关配置信息。idsv4的实现方式就是接口地址根据协议规定的去拼接，其他配置项信息根据开发的配置去动态获取，然后以协议约定的JSON格式返回。
