public override async Task ValidateTokenRequest(ValidateTokenRequestContext context)
{
// Note: the OpenID Connect server middleware supports authorization code, refresh token, client credentials
// and resource owner password credentials grant types but this authorization provider uses a safer policy
// rejecting the last two ones. You may consider relaxing it to support the ROPC or client credentials grant types.
if (!context.Request.IsAuthorizationCodeGrantType() && !context.Request.IsRefreshTokenGrantType())
{
context.Reject(
error: OpenIdConnectConstants.Errors.UnsupportedGrantType,
description: "Only authorization code and refresh token grant types " +
"are accepted by this authorization server");
return;
}
// Note: client authentication is not mandatory for non-confidential client applications like mobile apps
// (except when using the client credentials grant type) but this authorization server uses a safer policy
// that makes client authentication mandatory and returns an error if client_id or client_secret is missing.
// You may consider relaxing it to support the resource owner password credentials grant type
// with JavaScript or desktop applications, where client credentials cannot be safely stored.
// In this case, call context.Skip() to inform the server middleware the client is not trusted.
if (string.IsNullOrEmpty(context.ClientId) || string.IsNullOrEmpty(context.ClientSecret))
{
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidRequest,
description: "Missing credentials: ensure that your credentials were correctly " +
"flowed in the request body or in the authorization header");
return;
}
var database = context.HttpContext.RequestServices.GetRequiredService <ApplicationContext>();
// Retrieve the application details corresponding to the requested client_id.
var application = await(from entity in database.Applications
where entity.ApplicationID == context.ClientId
select entity).SingleOrDefaultAsync(context.HttpContext.RequestAborted);
if (application == null)
{
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidClient,
description: "Application not found in the database: ensure that your client_id is correct");
return;
}
// Note: to mitigate brute force attacks, you SHOULD strongly consider applying
// a key derivation function like PBKDF2 to slow down the secret validation process.
// You SHOULD also consider using a time-constant comparer to prevent timing attacks.
// For that, you can use the CryptoHelper library developed by @henkmollema:
// https://github.com/henkmollema/CryptoHelper. If you don't need .NET Core support,
// SecurityDriven.NET/inferno is a rock-solid alternative: http://securitydriven.net/inferno/
if (!string.Equals(context.ClientSecret, application.Secret, StringComparison.Ordinal))
{
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidClient,
description: "Invalid credentials: ensure that you specified a correct client_secret");
return;
}
context.Validate();
}
public override Task ValidateTokenRequest(ValidateTokenRequestContext context)
{
context.Validate();
return(Task.CompletedTask);
}
// Implement OnValidateTokenRequest to support flows using the token endpoint
// (code/refresh token/password/client credentials/custom grant).
public override async Task ValidateTokenRequest(ValidateTokenRequestContext context)
{
}
public override async Task ValidateTokenRequest([NotNull] ValidateTokenRequestContext context)
{
var options = (OpenIddictOptions)context.Options;
// Reject token requests that don't specify a supported grant type.
if (!options.GrantTypes.Contains(context.Request.GrantType))
{
Logger.LogError("The token request was rejected because the '{Grant}' " +
"grant is not supported.", context.Request.GrantType);
context.Reject(
error: OpenIdConnectConstants.Errors.UnsupportedGrantType,
description: "The specified grant_type is not supported by this authorization server.");
return;
}
// Reject token requests that specify scope=offline_access if the refresh token flow is not enabled.
if (context.Request.HasScope(OpenIdConnectConstants.Scopes.OfflineAccess) &&
!options.GrantTypes.Contains(OpenIdConnectConstants.GrantTypes.RefreshToken))
{
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidRequest,
description: "The 'offline_access' scope is not allowed.");
return;
}
// Optimization: the OpenID Connect server middleware automatically rejects grant_type=authorization_code
// requests missing the redirect_uri parameter if one was specified in the initial authorization request.
// Since OpenIddict doesn't allow redirect_uri-less authorization requests, an earlier check can be made here,
// which saves the OpenID Connect server middleware from having to deserialize the authorization code ticket.
// See http://openid.net/specs/openid-connect-core-1_0.html#TokenRequestValidation for more information.
if (context.Request.IsAuthorizationCodeGrantType() && string.IsNullOrEmpty(context.Request.RedirectUri))
{
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidRequest,
description: "The mandatory 'redirect_uri' parameter was missing.");
return;
}
// Note: the OpenID Connect server middleware allows returning a refresh token with grant_type=client_credentials,
// though it's usually not recommended by the OAuth2 specification. To encourage developers to make a new
// grant_type=client_credentials request instead of using refresh tokens, OpenIddict uses a stricter policy
// that rejects grant_type=client_credentials requests containing the 'offline_access' scope.
// See https://tools.ietf.org/html/rfc6749#section-4.4.3 for more information.
if (context.Request.IsClientCredentialsGrantType() &&
context.Request.HasScope(OpenIdConnectConstants.Scopes.OfflineAccess))
{
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidRequest,
description: "The 'offline_access' scope is not allowed when using grant_type=client_credentials.");
return;
}
// Optimization: the OpenID Connect server middleware automatically rejects grant_type=client_credentials
// requests when validation is skipped but an earlier check is made here to avoid making unnecessary
// database roundtrips to retrieve the client application corresponding to the client_id.
if (context.Request.IsClientCredentialsGrantType() && (string.IsNullOrEmpty(context.Request.ClientId) ||
string.IsNullOrEmpty(context.Request.ClientSecret)))
{
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidRequest,
description: "Client applications must be authenticated to use the client credentials grant.");
return;
}
// At this stage, skip client authentication if the client identifier is missing
// or reject the token request if client identification is set as required.
// Note: the OpenID Connect server middleware will automatically ensure that
// the calling application cannot use an authorization code or a refresh token
// if it's not the intended audience, even if client authentication was skipped.
if (string.IsNullOrEmpty(context.ClientId))
{
// Reject the request if client identification is mandatory.
if (options.RequireClientIdentification)
{
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidRequest,
description: "The mandatory 'client_id' parameter was missing.");
return;
}
Logger.LogDebug("The token request validation process was partially skipped " +
"because the 'client_id' parameter was missing or empty.");
context.Skip();
return;
}
// Retrieve the application details corresponding to the requested client_id.
var application = await Applications.FindByClientIdAsync(context.ClientId, context.HttpContext.RequestAborted);
if (application == null)
{
Logger.LogError("The token request was rejected because the client " +
"application was not found: '{ClientId}'.", context.ClientId);
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidClient,
description: "Application not found in the database: ensure that your client_id is correct.");
return;
}
if (await Applications.IsPublicAsync(application, context.HttpContext.RequestAborted))
{
// Note: public applications are not allowed to use the client credentials grant.
if (context.Request.IsClientCredentialsGrantType())
{
Logger.LogError("The token request was rejected because the public client application '{ClientId}' " +
"was not allowed to use the client credentials grant.", context.Request.ClientId);
context.Reject(
error: OpenIdConnectConstants.Errors.UnauthorizedClient,
description: "Public clients are not allowed to use the client credentials grant.");
return;
}
// Reject tokens requests containing a client_secret when the client is a public application.
if (!string.IsNullOrEmpty(context.ClientSecret))
{
Logger.LogError("The token request was rejected because the public application '{ClientId}' " +
"was not allowed to send a client secret.", context.ClientId);
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidRequest,
description: "Public clients are not allowed to send a client_secret.");
return;
}
Logger.LogInformation("The token request validation process was not fully validated because " +
"the client '{ClientId}' was a public application.", context.ClientId);
// If client authentication cannot be enforced, call context.Skip() to inform
// the OpenID Connect server middleware that the caller cannot be fully trusted.
context.Skip();
return;
}
// Confidential applications MUST authenticate
// to protect them from impersonation attacks.
if (string.IsNullOrEmpty(context.ClientSecret))
{
Logger.LogError("The token request was rejected because the confidential application " +
"'{ClientId}' didn't specify a client secret.", context.ClientId);
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidClient,
description: "Missing credentials: ensure that you specified a client_secret.");
return;
}
if (!await Applications.ValidateClientSecretAsync(application, context.ClientSecret, context.HttpContext.RequestAborted))
{
Logger.LogError("The token request was rejected because the confidential application " +
"'{ClientId}' didn't specify valid client credentials.", context.ClientId);
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidClient,
description: "Invalid credentials: ensure that you specified a correct client_secret.");
return;
}
context.Validate();
}
public override async Task ValidateTokenRequest([NotNull] ValidateTokenRequestContext context)
{
var options = (OpenIddictServerOptions)context.Options;
// Reject token requests that don't specify a supported grant type.
if (!options.GrantTypes.Contains(context.Request.GrantType))
{
_logger.LogError("The token request was rejected because the '{GrantType}' " +
"grant type is not supported.", context.Request.GrantType);
context.Reject(
error: OpenIddictConstants.Errors.UnsupportedGrantType,
description: "The specified 'grant_type' parameter is not supported.");
return;
}
// Reject token requests that specify scope=offline_access if the refresh token flow is not enabled.
if (context.Request.HasScope(OpenIddictConstants.Scopes.OfflineAccess) &&
!options.GrantTypes.Contains(OpenIddictConstants.GrantTypes.RefreshToken))
{
context.Reject(
error: OpenIddictConstants.Errors.InvalidRequest,
description: "The 'offline_access' scope is not allowed.");
return;
}
// Optimization: the OpenID Connect server middleware automatically rejects grant_type=authorization_code
// requests missing the redirect_uri parameter if one was specified in the initial authorization request.
// Since OpenIddict doesn't allow redirect_uri-less authorization requests, an earlier check can be made here,
// which saves the OpenID Connect server middleware from having to deserialize the authorization code ticket.
// See http://openid.net/specs/openid-connect-core-1_0.html#TokenRequestValidation for more information.
if (context.Request.IsAuthorizationCodeGrantType() && string.IsNullOrEmpty(context.Request.RedirectUri))
{
context.Reject(
error: OpenIddictConstants.Errors.InvalidRequest,
description: "The mandatory 'redirect_uri' parameter is missing.");
return;
}
// Note: the OpenID Connect server middleware allows returning a refresh token with grant_type=client_credentials,
// though it's usually not recommended by the OAuth2 specification. To encourage developers to make a new
// grant_type=client_credentials request instead of using refresh tokens, OpenIddict uses a stricter policy
// that rejects grant_type=client_credentials requests containing the 'offline_access' scope.
// See https://tools.ietf.org/html/rfc6749#section-4.4.3 for more information.
if (context.Request.IsClientCredentialsGrantType() &&
context.Request.HasScope(OpenIddictConstants.Scopes.OfflineAccess))
{
context.Reject(
error: OpenIddictConstants.Errors.InvalidRequest,
description: "The 'offline_access' scope is not valid for the specified 'grant_type' parameter.");
return;
}
// Validates scopes, unless scope validation was explicitly disabled.
if (!options.DisableScopeValidation)
{
var scopes = new HashSet <string>(context.Request.GetScopes(), StringComparer.Ordinal);
scopes.ExceptWith(options.Scopes);
// If all the specified scopes are registered in the options, avoid making a database lookup.
if (scopes.Count != 0)
{
foreach (var scope in await _scopeManager.FindByNamesAsync(scopes.ToImmutableArray()))
{
scopes.Remove(await _scopeManager.GetNameAsync(scope));
}
}
// If at least one scope was not recognized, return an error.
if (scopes.Count != 0)
{
_logger.LogError("The token request was rejected because invalid scopes were specified: {Scopes}.", scopes);
context.Reject(
error: OpenIddictConstants.Errors.InvalidScope,
description: "The specified 'scope' parameter is not valid.");
return;
}
}
// Optimization: the OpenID Connect server middleware automatically rejects grant_type=client_credentials
// requests when validation is skipped but an earlier check is made here to avoid making unnecessary
// database roundtrips to retrieve the client application corresponding to the client_id.
if (context.Request.IsClientCredentialsGrantType() && (string.IsNullOrEmpty(context.Request.ClientId) ||
string.IsNullOrEmpty(context.Request.ClientSecret)))
{
context.Reject(
error: OpenIddictConstants.Errors.InvalidRequest,
description: "The 'client_id' and 'client_secret' parameters are " +
"required when using the client credentials grant.");
return;
}
// At this stage, skip client authentication if the client identifier is missing
// or reject the token request if client identification is set as required.
// Note: the OpenID Connect server middleware will automatically ensure that
// the calling application cannot use an authorization code or a refresh token
// if it's not the intended audience, even if client authentication was skipped.
if (string.IsNullOrEmpty(context.ClientId))
{
// Reject the request if client identification is mandatory.
if (!options.AcceptAnonymousClients)
{
_logger.LogError("The token request was rejected becaused the " +
"mandatory client_id parameter was missing or empty.");
context.Reject(
error: OpenIddictConstants.Errors.InvalidRequest,
description: "The mandatory 'client_id' parameter is missing.");
return;
}
_logger.LogDebug("The token request validation process was partially skipped " +
"because the 'client_id' parameter was missing or empty.");
context.Skip();
return;
}
// Retrieve the application details corresponding to the requested client_id.
var application = await _applicationManager.FindByClientIdAsync(context.ClientId);
if (application == null)
{
_logger.LogError("The token request was rejected because the client " +
"application was not found: '{ClientId}'.", context.ClientId);
context.Reject(
error: OpenIddictConstants.Errors.InvalidClient,
description: "The specified 'client_id' parameter is invalid.");
return;
}
// Store the application entity as a request property to make it accessible
// from the other provider methods without having to call the store twice.
context.Request.SetProperty($"{OpenIddictConstants.Properties.Application}:{context.ClientId}", application);
// Reject the request if the application is not allowed to use the token endpoint.
if (!options.IgnoreEndpointPermissions &&
!await _applicationManager.HasPermissionAsync(application, OpenIddictConstants.Permissions.Endpoints.Token))
{
_logger.LogError("The token request was rejected because the application '{ClientId}' " +
"was not allowed to use the token endpoint.", context.ClientId);
context.Reject(
error: OpenIddictConstants.Errors.UnauthorizedClient,
description: "This client application is not allowed to use the token endpoint.");
return;
}
if (!options.IgnoreGrantTypePermissions)
{
// Reject the request if the application is not allowed to use the specified grant type.
if (!await _applicationManager.HasPermissionAsync(application,
OpenIddictConstants.Permissions.Prefixes.GrantType + context.Request.GrantType))
{
_logger.LogError("The token request was rejected because the application '{ClientId}' was not allowed to " +
"use the specified grant type: {GrantType}.", context.ClientId, context.Request.GrantType);
context.Reject(
error: OpenIddictConstants.Errors.UnauthorizedClient,
description: "This client application is not allowed to use the specified grant type.");
return;
}
// Reject the request if the offline_access scope was request and if
// the application is not allowed to use the refresh token grant type.
if (context.Request.HasScope(OpenIddictConstants.Scopes.OfflineAccess) &&
!await _applicationManager.HasPermissionAsync(application, OpenIddictConstants.Permissions.GrantTypes.RefreshToken))
{
_logger.LogError("The token request was rejected because the application '{ClientId}' " +
"was not allowed to request the 'offline_access' scope.", context.ClientId);
context.Reject(
error: OpenIddictConstants.Errors.InvalidRequest,
description: "The client application is not allowed to use the 'offline_access' scope.");
return;
}
}
if (await _applicationManager.IsPublicAsync(application))
{
// Note: public applications are not allowed to use the client credentials grant.
if (context.Request.IsClientCredentialsGrantType())
{
_logger.LogError("The token request was rejected because the public client application '{ClientId}' " +
"was not allowed to use the client credentials grant.", context.Request.ClientId);
context.Reject(
error: OpenIddictConstants.Errors.UnauthorizedClient,
description: "The specified 'grant_type' parameter is not valid for this client application.");
return;
}
// Reject token requests containing a client_secret when the client is a public application.
if (!string.IsNullOrEmpty(context.ClientSecret))
{
_logger.LogError("The token request was rejected because the public application '{ClientId}' " +
"was not allowed to send a client secret.", context.ClientId);
context.Reject(
error: OpenIddictConstants.Errors.InvalidRequest,
description: "The 'client_secret' parameter is not valid for this client application.");
return;
}
_logger.LogDebug("The token request validation process was not fully validated because " +
"the client '{ClientId}' was a public application.", context.ClientId);
// If client authentication cannot be enforced, call context.Skip() to inform
// the OpenID Connect server middleware that the caller cannot be fully trusted.
context.Skip();
return;
}
// Confidential and hybrid applications MUST authenticate
// to protect them from impersonation attacks.
if (string.IsNullOrEmpty(context.ClientSecret))
{
_logger.LogError("The token request was rejected because the confidential or hybrid application " +
"'{ClientId}' didn't specify a client secret.", context.ClientId);
context.Reject(
error: OpenIddictConstants.Errors.InvalidClient,
description: "The 'client_secret' parameter required for this client application is missing.");
return;
}
if (!await _applicationManager.ValidateClientSecretAsync(application, context.ClientSecret))
{
_logger.LogError("The token request was rejected because the confidential or hybrid application " +
"'{ClientId}' didn't specify valid client credentials.", context.ClientId);
context.Reject(
error: OpenIddictConstants.Errors.InvalidClient,
description: "The specified client credentials are invalid.");
return;
}
// Unless permission enforcement was explicitly disabled, ensure
// the client application is allowed to use the specified scopes.
if (!options.IgnoreScopePermissions)
{
foreach (var scope in context.Request.GetScopes())
{
// Avoid validating the "openid" and "offline_access" scopes as they represent protocol scopes.
if (string.Equals(scope, OpenIddictConstants.Scopes.OfflineAccess, StringComparison.Ordinal) ||
string.Equals(scope, OpenIddictConstants.Scopes.OpenId, StringComparison.Ordinal))
{
continue;
}
// Reject the request if the application is not allowed to use the iterated scope.
if (!await _applicationManager.HasPermissionAsync(application,
OpenIddictConstants.Permissions.Prefixes.Scope + scope))
{
_logger.LogError("The token request was rejected because the application '{ClientId}' " +
"was not allowed to use the scope {Scope}.", context.ClientId, scope);
context.Reject(
error: OpenIddictConstants.Errors.InvalidRequest,
description: "This client application is not allowed to use the specified scope.");
return;
}
}
}
context.Validate();
await _eventService.PublishAsync(new OpenIddictServerEvents.ValidateTokenRequest(context));
}
public override async Task ValidateTokenRequest([NotNull] ValidateTokenRequestContext context)
{
var services = context.HttpContext.RequestServices.GetRequiredService <OpenIddictServices <TUser, TApplication> >();
// Note: OpenIdConnectServerHandler supports authorization code, refresh token,
// client credentials, resource owner password credentials and custom grants
// but this authorization server uses a stricter policy rejecting custom grant types.
if (!context.Request.IsAuthorizationCodeGrantType() && !context.Request.IsRefreshTokenGrantType() &&
!context.Request.IsPasswordGrantType() && !context.Request.IsClientCredentialsGrantType())
{
context.Reject(
error: OpenIdConnectConstants.Errors.UnsupportedGrantType,
description: "Only authorization code, refresh token, client credentials " +
"and password grants are accepted by this authorization server.");
return;
}
// Note: though required by the OpenID Connect specification for the refresh token grant,
// client authentication is not mandatory for non-confidential client applications in OAuth2.
// To avoid breaking OAuth2 scenarios, OpenIddict uses a relaxed policy that allows
// public applications to use the refresh token grant without having to authenticate.
// See http://openid.net/specs/openid-connect-core-1_0.html#RefreshingAccessToken
// and https://tools.ietf.org/html/rfc6749#section-6 for more information.
// Skip client authentication if the client identifier is missing.
// Note: ASOS will automatically ensure that the calling application
// cannot use an authorization code or a refresh token if it's not
// the intended audience, even if client authentication was skipped.
if (string.IsNullOrEmpty(context.ClientId))
{
context.Skip();
return;
}
// Retrieve the application details corresponding to the requested client_id.
var application = await services.Applications.FindApplicationByIdAsync(context.ClientId);
if (application == null)
{
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidClient,
description: "Application not found in the database: ensure that your client_id is correct.");
return;
}
// Reject tokens requests containing a client_secret if the client application is not confidential.
if (await services.Applications.IsPublicApplicationAsync(application) && !string.IsNullOrEmpty(context.ClientSecret))
{
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidRequest,
description: "Public clients are not allowed to send a client_secret.");
return;
}
// Confidential applications MUST authenticate
// to protect them from impersonation attacks.
else if (await services.Applications.IsConfidentialApplicationAsync(application))
{
if (string.IsNullOrEmpty(context.ClientSecret))
{
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidClient,
description: "Missing credentials: ensure that you specified a client_secret.");
return;
}
if (!await services.Applications.ValidateSecretAsync(application, context.ClientSecret))
{
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidClient,
description: "Invalid credentials: ensure that you specified a correct client_secret.");
return;
}
}
context.Validate();
}
public override async Task ValidateTokenRequest([NotNull] ValidateTokenRequestContext context)
{
var services = context.HttpContext.RequestServices.GetRequiredService <OpenIddictServices <TUser, TApplication, TAuthorization, TScope, TToken> >();
// Reject token requests that don't specify a supported grant type.
if (!services.Options.GrantTypes.Contains(context.Request.GrantType))
{
services.Logger.LogError("The token request was rejected because the '{Grant}' " +
"grant is not supported.", context.Request.GrantType);
context.Reject(
error: OpenIdConnectConstants.Errors.UnsupportedGrantType,
description: "The specified grant_type is not supported by this authorization server.");
return;
}
// Reject token requests that specify scope=offline_access if the refresh token flow is not enabled.
if (context.Request.HasScope(OpenIdConnectConstants.Scopes.OfflineAccess) && !services.Options.IsRefreshTokenFlowEnabled())
{
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidRequest,
description: "The 'offline_access' scope is not allowed.");
return;
}
// Note: the OpenID Connect server middleware allows returning a refresh token with grant_type=client_credentials,
// though it's usually not recommended by the OAuth2 specification. To encourage developers to make a new
// grant_type=client_credentials request instead of using refresh tokens, OpenIddict uses a stricter policy
// that rejects grant_type=client_credentials requests containing the 'offline_access' scope.
// See https://tools.ietf.org/html/rfc6749#section-4.4.3 for more information.
if (context.Request.IsClientCredentialsGrantType() &&
context.Request.HasScope(OpenIdConnectConstants.Scopes.OfflineAccess))
{
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidRequest,
description: "The 'offline_access' scope is not allowed when using grant_type=client_credentials.");
return;
}
// Note: the OpenID Connect server middleware rejects grant_type=client_credentials requests
// when validation is skipped but an early check is made here to avoid making unnecessary
// database roundtrips to retrieve the client application corresponding to the client_id.
if (context.Request.IsClientCredentialsGrantType() && (string.IsNullOrEmpty(context.Request.ClientId) ||
string.IsNullOrEmpty(context.Request.ClientSecret)))
{
services.Logger.LogError("The token request was rejected because the client credentials were missing.");
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidRequest,
description: "Client applications must be authenticated to use the client credentials grant.");
return;
}
// Note: though required by the OpenID Connect specification for the refresh token grant,
// client authentication is not mandatory for non-confidential client applications in OAuth2.
// To avoid breaking OAuth2 scenarios, OpenIddict uses a relaxed policy that allows
// public applications to use the refresh token grant without having to authenticate.
// See http://openid.net/specs/openid-connect-core-1_0.html#RefreshingAccessToken
// and https://tools.ietf.org/html/rfc6749#section-6 for more information.
// At this stage, skip client authentication if the client identifier is missing.
// Note: the OpenID Connect server middleware will automatically ensure that
// the calling application cannot use an authorization code or a refresh token
// if it's not the intended audience, even if client authentication was skipped.
if (string.IsNullOrEmpty(context.ClientId))
{
services.Logger.LogInformation("The token request validation process was skipped " +
"because the client_id parameter was missing or empty.");
context.Skip();
return;
}
// Retrieve the application details corresponding to the requested client_id.
var application = await services.Applications.FindByClientIdAsync(context.ClientId);
if (application == null)
{
services.Logger.LogError("The token request was rejected because the client " +
"application was not found: '{ClientId}'.", context.ClientId);
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidClient,
description: "Application not found in the database: ensure that your client_id is correct.");
return;
}
if (await services.Applications.IsPublicAsync(application))
{
// Note: public applications are not allowed to use the client credentials grant.
if (context.Request.IsClientCredentialsGrantType())
{
services.Logger.LogError("The token request was rejected because the public client application '{ClientId}' " +
"was not allowed to use the client credentials grant.", context.Request.ClientId);
context.Reject(
error: OpenIdConnectConstants.Errors.UnauthorizedClient,
description: "Public clients are not allowed to use the client credentials grant.");
return;
}
// Reject tokens requests containing a client_secret when the client is a public application.
if (!string.IsNullOrEmpty(context.ClientSecret))
{
services.Logger.LogError("The token request was rejected because the public application '{ClientId}' " +
"was not allowed to send a client secret.", context.ClientId);
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidRequest,
description: "Public clients are not allowed to send a client_secret.");
return;
}
services.Logger.LogInformation("The token request validation process was not fully validated because " +
"the client '{ClientId}' was a public application.", context.ClientId);
// If client authentication cannot be enforced, call context.Skip() to inform
// the OpenID Connect server middleware that the caller cannot be fully trusted.
context.Skip();
return;
}
// Confidential applications MUST authenticate
// to protect them from impersonation attacks.
if (string.IsNullOrEmpty(context.ClientSecret))
{
services.Logger.LogError("The token request was rejected because the confidential application " +
"'{ClientId}' didn't specify a client secret.", context.ClientId);
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidClient,
description: "Missing credentials: ensure that you specified a client_secret.");
return;
}
if (!await services.Applications.ValidateSecretAsync(application, context.ClientSecret))
{
services.Logger.LogError("The token request was rejected because the confidential application " +
"'{ClientId}' didn't specify valid client credentials.", context.ClientId);
context.Reject(
error: OpenIdConnectConstants.Errors.InvalidClient,
description: "Invalid credentials: ensure that you specified a correct client_secret.");
return;
}
context.Validate();
}
