fix: add redirect_after_logout_uri for ODIC that do not have an end_session_endpoint

apisix/plugins/openid-connect.lua

@@ -440,6 +440,8 @@ function _M.rewrite(plugin_conf, ctx)
         conf.timeout = conf.timeout * 1000
     end
 
+    local path = ctx.var.request_uri
+
     if not conf.redirect_uri then
         -- NOTE: 'lua-resty-openidc' requires that 'redirect_uri' be
         --       different from 'uri'.  So default to append the
@@ -464,6 +466,19 @@ function _M.rewrite(plugin_conf, ctx)
         conf.ssl_verify = "no"
     end
 
+    if path == (conf.logout_path or "/logout") then
+        local discovery, discovery_err = openidc.get_discovery_doc(conf)
+        if discovery_err then
+            core.log.error("OIDC access discovery url failed : ", discovery_err)
+            return 503
+        end
+        if conf.post_logout_redirect_uri and not discovery.end_session_endpoint then
+            -- If the end_session_endpoint field does not exist in the OpenID Provider Discovery
+            -- Metadata, the redirect_after_logout_uri field is used for redirection.
+            conf.redirect_after_logout_uri = conf.post_logout_redirect_uri
+        end
+    end
+
     local response, err, session, _
 
     if conf.bearer_only or conf.introspection_endpoint or conf.public_key then

docs/en/latest/plugins/openid-connect.md

@@ -43,7 +43,7 @@ description: OpenID Connect allows the client to obtain user information from th
 | realm                                | string   | False    | "apisix"              |              | Realm used for authentication.                                                                                                                                                                                                        |
 | bearer_only                          | boolean  | False    | false                 |              | When set to `true`, APISIX will only check if the authorization header in the request matches a bearer token.                                                                                                                         |
 | logout_path                          | string   | False    | "/logout"             |              | Path for logging out.                                                                                                                                                                                                                 |
-| post_logout_redirect_uri             | string   | False    |                       |              | URL to redirect to after logging out.                                                                                                                                                                                                 |
+| post_logout_redirect_uri             | string   | False    |                       |              | URL to redirect to after logging out. If the OIDC discovery endpoint does not provide an [`end_session_endpoint`](https://openid.net/specs/openid-connect-rpinitiated-1_0.html), the plugin internally redirects using the [`redirect_after_logout_uri`](https://github.com/zmartzone/lua-resty-openidc). Otherwise, it redirects using the [`post_logout_redirect_uri`](https://openid.net/specs/openid-connect-rpinitiated-1_0.html). |
 | redirect_uri                         | string  | False    |                       |              | URI to which the identity provider redirects back to. If not configured, APISIX will append the `.apisix/redirect` suffix to determine the default `redirect_uri`. Note that the provider should be properly configured to allow such `redirect_uri` values. |
 | timeout                              | integer  | False    | 3                     | [1,...]      | Request timeout time in seconds.                                                                                                                                                                                                      |
 | ssl_verify                           | boolean  | False    | false                 |              | When set to true, verifies the identity provider's SSL certificates.                                                                                                                                                                  |

docs/zh/latest/plugins/openid-connect.md

@@ -42,7 +42,7 @@ description: OpenID Connect（OIDC）是基于 OAuth 2.0 的身份认证协议
 | realm                                | string  | 否     | "apisix"              |               | bearer token 无效时 [`WWW-Authenticate` 响应头](https://www.rfc-editor.org/rfc/rfc6750#section-3)中会伴随着的 `realm` 讯息。                                                                                |
 | bearer_only                          | boolean | 否     | false                 |               | 当设置为 `true` 时，将仅检查请求头中的令牌（Token）。                                               |
 | logout_path                          | string  | 否     | "/logout"             |               | 登出路径。                                                                                        |
-| post_logout_redirect_uri             | string  | 否     |                       |               | 调用登出接口后想要跳转的 URL。                                                                     |
+| post_logout_redirect_uri             | string  | 否     |                       |               | 调用登出接口后想要跳转的 URL。如果 OIDC 的服务发现端点没有提供 [`end_session_endpoint`](https://openid.net/specs/openid-connect-rpinitiated-1_0.html) ，插件内部会使用 [`redirect_after_logout_uri`](https://github.com/zmartzone/lua-resty-openidc) 进行重定向，否则使用 [`post_logout_redirect_uri`](https://openid.net/specs/openid-connect-rpinitiated-1_0.html) 进行重定向。 |
 | redirect_uri                         | string  | 否     |                       |               | 身份提供者重定向返回的 URI。如果缺失，则 APISIX 将在当前 URI 之后追加 `.apisix/redirect` 作为默认的 `redirect_uri`。注意，OP 也需要适当配置以允许这种形式的 `redirect_uri`。 |
 | timeout                              | integer | 否     | 3                     | [1,...]       | 请求超时时间，单位为秒                                                                             |
 | ssl_verify                           | boolean | 否     | false                 | [true, false] | 当设置为 `true` 时，验证身份提供者的 SSL 证书。                                                     |

t/plugin/openid-connect.t

@@ -1303,3 +1303,125 @@ passed
     }
 --- response_body_like
 x-userinfo: ey.*
+
+
+
+=== TEST 34: Set up new route with plugin matching URI `/*`
+--- config
+    location /t {
+        content_by_lua_block {
+            local t = require("lib.test_admin").test
+            local code, body = t('/apisix/admin/routes/1',
+                 ngx.HTTP_PUT,
+                 [[{ "plugins": {
+                            "openid-connect": {
+                                "client_id": "kbyuFDidLLm280LIwVFiazOqjO3ty8KH",
+                                "client_secret": "60Op4HFM0I8ajz0WdiStAbziZ-VFQttXuxixHHs2R7r7-CW8GR79l-mmLqMhc-Sa",
+                                "discovery": "https://samples.auth0.com/.well-known/openid-configuration",
+                                "redirect_uri": "https://iresty.com",
+                                "post_logout_redirect_uri": "https://iresty.com",
+                                "scope": "openid profile"
+                            }
+                        },
+                        "upstream": {
+                            "nodes": {
+                                "127.0.0.1:1980": 1
+                            },
+                            "type": "roundrobin"
+                        },
+                        "uri": "/*"
+                }]]
+                )
+
+            if code >= 300 then
+                ngx.status = code
+            end
+            ngx.say(body)
+        }
+    }
+--- response_body
+passed
+
+
+
+=== TEST 35: Check whether outh0 can redirect normally using post_logout_redirect_uri configuration
+--- config
+    location /t {
+        content_by_lua_block {
+            local http = require "resty.http"
+            local httpc = http.new()
+            local uri = "http://127.0.0.1:" .. ngx.var.server_port .. "/logout"
+            local res, err = httpc:request_uri(uri, {method = "GET"})
+            ngx.status = res.status
+            local location = res.headers['Location']
+            if location and string.find(location, 'https://iresty.com') ~= -1 and
+                string.find(location, 'post_logout_redirect_uri=https://iresty.com') ~= -1 then
+                ngx.say(true)
+            end
+        }
+    }
+--- timeout: 10s
+--- response_body
+true
+--- error_code: 302
+
+
+
+=== TEST 36: Set up new route with plugin matching URI `/*`
+--- config
+    location /t {
+        content_by_lua_block {
+            local t = require("lib.test_admin").test
+            local code, body = t('/apisix/admin/routes/1',
+                 ngx.HTTP_PUT,
+                 [[{ "plugins": {
+                            "openid-connect": {
+                                "client_id": "942299072001-vhduu1uljmdhhbbp7g22m3qsmo246a75.apps.googleusercontent.com",
+                                "client_secret": "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",
+                                "discovery": "https://accounts.google.com/.well-known/openid-configuration",
+                                "redirect_uri": "https://iresty.com",
+                                "post_logout_redirect_uri": "https://iresty.com",
+                                "scope": "openid profile"
+                            }
+                        },
+                        "upstream": {
+                            "nodes": {
+                                "127.0.0.1:1980": 1
+                            },
+                            "type": "roundrobin"
+                        },
+                        "uri": "/*"
+                }]]
+                )
+
+            if code >= 300 then
+                ngx.status = code
+            end
+            ngx.say(body)
+        }
+    }
+--- response_body
+passed
+
+
+
+=== TEST 37: Check whether google can redirect normally using post_logout_redirect_uri configuration
+--- config
+    location /t {
+        content_by_lua_block {
+            local http = require "resty.http"
+            local httpc = http.new()
+            local uri = "http://127.0.0.1:" .. ngx.var.server_port .. "/logout"
+            local res, err = httpc:request_uri(uri, {method = "GET"})
+            ngx.status = res.status
+            local location = res.headers['Location']
+            if location and string.find(location, 'https://iresty.com') ~= -1 and
+                string.find(location, 'post_logout_redirect_uri=https://iresty.com') ~= -1 then
+                ngx.say(true)
+            end
+        }
+    }
+--- timeout: 10s
+--- response_body
+true
+--- error_code: 302