feat: patch oauth2-proxy to support scopes as groups

README.md

@@ -151,7 +151,7 @@ kanidm group create grafana-server-admins
 kanidm group create grafana-admins
 kanidm group create grafana-editors
 kanidm system oauth2 create grafana "Grafana" https://grafana.${personalDomain}
-kanidm system oauth2 update-scope-map grafana grafana-access openid profile email
+kanidm system oauth2 update-scope-map grafana grafana-access openid email profile
 kanidm system oauth2 update-sup-scope-map grafana grafana-server-admins server_admin
 kanidm system oauth2 update-sup-scope-map grafana grafana-admins admin
 kanidm system oauth2 update-sup-scope-map grafana grafana-editors editor
@@ -160,7 +160,7 @@ kanidm system oauth2 show-basic-secret grafana
 kanidm group create web-sentinel-access
 kanidm group create web-sentinel-adguardhome-access
 kanidm system oauth2 create web-sentinel "Web services" https://oauth2.${personalDomain}
-kanidm system oauth2 update-scope-map web-sentinel web-sentinel-access openid profile email
+kanidm system oauth2 update-scope-map web-sentinel web-sentinel-access openid email
 kanidm system oauth2 update-sup-scope-map web-sentinel web-sentinel-adguardhome-access access_adguardhome
 kanidm system oauth2 show-basic-secret web-sentinel
 # Add new user
@@ -169,6 +169,7 @@ kanidm person create myuser "My User"
 kanidm person update myuser --legalname "Full Name" --mail "myuser@example.com"
 kanidm group add-members grafana-access myuser
 kanidm group add-members grafana-server-admins myuser
+kanidm group add-members web-sentinel-access myuser
 
 
 ```

hosts/sentinel/oauth2.nix

@@ -8,6 +8,7 @@
     enable = true;
     cookieDomain = config.repo.secrets.local.personalDomain;
     portalDomain = "oauth2.${config.repo.secrets.local.personalDomain}";
+    # TODO portal redirect to dashboard (in case someone clicks on kanidm "Web services")
   };
 
   age.secrets.oauth2-proxy-secret = {
@@ -16,24 +17,21 @@
     group = "oauth2_proxy";
   };
 
-  services.oauth2_proxy = {
+  services.oauth2_proxy = let
+    clientId = "web-sentinel";
+  in {
     provider = "oidc";
     scope = "openid email";
     loginURL = "https://${config.proxiedDomains.kanidm}/ui/oauth2";
     redeemURL = "https://${config.proxiedDomains.kanidm}/oauth2/token";
-    validateURL = "https://${config.proxiedDomains.kanidm}/oauth2/openid/web-sentinel/userinfo";
-    clientID = "web-sentinel";
+    validateURL = "https://${config.proxiedDomains.kanidm}/oauth2/openid/${clientId}/userinfo";
+    clientID = clientId;
     keyFile = config.age.secrets.oauth2-proxy-secret.path;
     email.domains = ["*"];
 
     extraConfig = {
-      # TODO good idea? would fail when offline
-      # TODO autorestart after 30 minutes, infinite times.
-      oidc-issuer-url = "https://${config.proxiedDomains.kanidm}/oauth2/openid/web-sentinel";
+      oidc-issuer-url = "https://${config.proxiedDomains.kanidm}/oauth2/openid/${clientId}";
       skip-provider-button = true;
-
-      # TODO away
-      show-debug-on-error = true;
     };
   };
 }

hosts/ward/microvms/adguardhome/default.nix

@@ -36,7 +36,7 @@ in {
         forceSSL = true;
         useACMEHost = sentinelCfg.lib.extra.matchingWildcardCert adguardhomeDomain;
         oauth2.enable = true;
-        oauth2.allowedGroups = ["adguardhome"];
+        oauth2.allowedGroups = ["access_adguardhome"];
         locations."/" = {
           proxyPass = "http://adguardhome";
           proxyWebsockets = true;

modules/oauth2-proxy.nix

@@ -99,12 +99,14 @@ in {
 
       cookie.domain = ".${cfg.cookieDomain}";
       cookie.secure = true;
-      cookie.httpOnly = false;
-      cookie.refresh = "5m";
+      # FIXME disabled because of errors. My closest guess is that this
+      # reuses refresh tokens but kanidm forbids that. Not sure though.
+      #cookie.refresh = "5m";
       cookie.expire = "30m";
 
       reverseProxy = true;
       httpAddress = "unix:///run/oauth2_proxy/oauth2_proxy.sock";
+      redirectURL = "https://${cfg.portalDomain}/oauth2/callback";
       setXauthrequest = true;
 
       extraConfig = {
@@ -112,12 +114,10 @@ in {
         code-challenge-method = "S256";
         # Share the cookie with all subpages
         whitelist-domain = ".${cfg.cookieDomain}";
-        redirect-url = "https://${cfg.portalDomain}/oauth2/callback";
         set-authorization-header = true;
         pass-access-token = true;
         skip-jwt-bearer-tokens = true;
         upstream = "static://202";
-        # TODO allowed group?
       };
     };
 

pkgs/default.nix

@@ -1,3 +1,4 @@
 [
   (import ./caddy.nix)
+  (import ./oauth2-proxy)
 ]

pkgs/oauth2-proxy/0001-scopes-as-groups.patch

@@ -0,0 +1,44 @@
+diff --git a/providers/oidc.go b/providers/oidc.go
+index aadaf7c5..18b03a3e 100644
+--- a/providers/oidc.go
++++ b/providers/oidc.go
+@@ -10,6 +10,7 @@ import (
+ 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options"
+ 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
+ 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/logger"
++	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/requests"
+ 	"golang.org/x/oauth2"
+ )
+ 
+@@ -80,6 +81,31 @@ func (p *OIDCProvider) Redeem(ctx context.Context, redirectURL, code, codeVerifi
+ // EnrichSession is called after Redeem to allow providers to enrich session fields
+ // such as User, Email, Groups with provider specific API calls.
+ func (p *OIDCProvider) EnrichSession(ctx context.Context, s *sessions.SessionState) error {
++	// Fallback to ValidateURL if ProfileURL not set for legacy compatibility
++	profileURL := p.ValidateURL.String()
++	if p.ProfileURL.String() != "" {
++		profileURL = p.ProfileURL.String()
++	}
++
++	json, err := requests.New(profileURL).
++		WithContext(ctx).
++		SetHeader("Authorization", "Bearer "+s.AccessToken).
++		Do().
++		UnmarshalSimpleJSON()
++	if err != nil {
++		logger.Errorf("failed making request %v", err)
++		return err
++	}
++
++	groups, err := json.Get("scopes").StringArray()
++	if err == nil {
++		for _, group := range groups {
++			if group != "" {
++				s.Groups = append(s.Groups, group)
++			}
++		}
++	}
++
+ 	// If a mandatory email wasn't set, error at this point.
+ 	if s.Email == "" {
+ 		return errors.New("neither the id_token nor the profileURL set an email")

pkgs/oauth2-proxy/default.nix

@@ -0,0 +1,5 @@
+final: prev: {
+  oauth2-proxy = prev.oauth2-proxy.overrideAttrs (_: {
+    patches = [./0001-scopes-as-groups.patch];
+  });
+}