Send request body to authorization server for forward auth

docs/content/middlewares/http/forwardauth.md

@@ -334,6 +334,98 @@ http:
     addAuthCookiesToResponse = ["Session-Cookie", "State-Cookie"]
 ```
 
+### `forwardBody`
+
+_Optional, Default=false_
+
+Set the `forwardBody` option to `true` to send Body.
+
+!!! info
+
+    As body is read inside Traefik before forwarding, this breaks streaming.
+
+```yaml tab="Docker & Swarm"
+labels:
+  - "traefik.http.middlewares.test-auth.forwardauth.forwardBody=true"
+```
+
+```yaml tab="Kubernetes"
+apiVersion: traefik.io/v1alpha1
+kind: Middleware
+metadata:
+  name: test-auth
+spec:
+  forwardAuth:
+    address: https://example.com/auth
+    forwardBody: true
+```
+
+```yaml tab="Consul Catalog"
+- "traefik.http.middlewares.test-auth.forwardauth.forwardBody=true"
+```
+
+```yaml tab="File (YAML)"
+http:
+  middlewares:
+    test-auth:
+      forwardAuth:
+        address: "https://example.com/auth"
+        forwardBody: true
+```
+
+```toml tab="File (TOML)"
+[http.middlewares]
+  [http.middlewares.test-auth.forwardAuth]
+    address = "https://example.com/auth"
+    forwardBody = true
+```
+
+### `maxBodySize`
+
+_Optional, Default=-1_
+
+Set the `maxBodySize` to limit the body size in bytes.
+If body is bigger than this, it returns a 401 (unauthorized).
+Default is `-1`, which means no limit.
+
+```yaml tab="Docker & Swarm"
+labels:
+  - "traefik.http.middlewares.test-auth.forwardauth.maxBodySize=1000"
+```
+
+```yaml tab="Kubernetes"
+apiVersion: traefik.io/v1alpha1
+kind: Middleware
+metadata:
+  name: test-auth
+spec:
+  forwardAuth:
+    address: https://example.com/auth
+    forwardBody: true
+    maxBodySize: 1000
+```
+
+```yaml tab="Consul Catalog"
+- "traefik.http.middlewares.test-auth.forwardauth.maxBodySize=1000"
+```
+
+```yaml tab="File (YAML)"
+http:
+  middlewares:
+    test-auth:
+      forwardAuth:
+        address: "https://example.com/auth"
+        maxBodySize: 1000
+```
+
+```toml tab="File (TOML)"
+[http.middlewares]
+  [http.middlewares.test-auth.forwardAuth]
+    address = "https://example.com/auth"
+    forwardBody = true
+    maxBodySize = 1000
+```
+
 ### `tls`
 
 _Optional_

docs/content/reference/dynamic-configuration/docker-labels.yml

@@ -38,7 +38,9 @@
 - "traefik.http.middlewares.middleware10.forwardauth.authrequestheaders=foobar, foobar"
 - "traefik.http.middlewares.middleware10.forwardauth.authresponseheaders=foobar, foobar"
 - "traefik.http.middlewares.middleware10.forwardauth.authresponseheadersregex=foobar"
+- "traefik.http.middlewares.middleware10.forwardauth.forwardbody=true"
 - "traefik.http.middlewares.middleware10.forwardauth.headerfield=foobar"
+- "traefik.http.middlewares.middleware10.forwardauth.maxbodysize=42"
 - "traefik.http.middlewares.middleware10.forwardauth.tls.ca=foobar"
 - "traefik.http.middlewares.middleware10.forwardauth.tls.caoptional=true"
 - "traefik.http.middlewares.middleware10.forwardauth.tls.cert=foobar"

docs/content/reference/dynamic-configuration/file.toml

@@ -182,6 +182,8 @@
         authRequestHeaders = ["foobar", "foobar"]
         addAuthCookiesToResponse = ["foobar", "foobar"]
         headerField = "foobar"
+        forwardBody = true
+        maxBodySize = 42
         [http.middlewares.Middleware10.forwardAuth.tls]
           ca = "foobar"
           cert = "foobar"

docs/content/reference/dynamic-configuration/file.yaml

@@ -209,6 +209,8 @@ http:
           - foobar
           - foobar
         headerField: foobar
+        forwardBody: true
+        maxBodySize: 42
     Middleware11:
       grpcWeb:
         allowOrigins:

docs/content/reference/dynamic-configuration/kubernetes-crd-definition-v1.yml

@@ -1234,6 +1234,15 @@ spec:
                       AuthResponseHeadersRegex defines the regex to match headers to copy from the authentication server response and set on forwarded request, after stripping all headers that match the regex.
                       More info: https://doc.traefik.io/traefik/v3.2/middlewares/http/forwardauth/#authresponseheadersregex
                     type: string
+                  forwardBody:
+                    description: ForwardBody defines whether to send the request body
+                      to the authentication server.
+                    type: boolean
+                  maxBodySize:
+                    description: MaxBodySize defines the maximum body size in bytes
+                      allowed to be forwarded to the authentication server.
+                    format: int64
+                    type: integer
                   tls:
                     description: TLS defines the configuration used to secure the
                       connection to the authentication server.

docs/content/reference/dynamic-configuration/kv-ref.md

@@ -48,7 +48,9 @@ THIS FILE MUST NOT BE EDITED BY HAND
 | `traefik/http/middlewares/Middleware10/forwardAuth/authResponseHeaders/0` | `foobar` |
 | `traefik/http/middlewares/Middleware10/forwardAuth/authResponseHeaders/1` | `foobar` |
 | `traefik/http/middlewares/Middleware10/forwardAuth/authResponseHeadersRegex` | `foobar` |
+| `traefik/http/middlewares/Middleware10/forwardAuth/forwardBody` | `true` |
 | `traefik/http/middlewares/Middleware10/forwardAuth/headerField` | `foobar` |
+| `traefik/http/middlewares/Middleware10/forwardAuth/maxBodySize` | `42` |
 | `traefik/http/middlewares/Middleware10/forwardAuth/tls/ca` | `foobar` |
 | `traefik/http/middlewares/Middleware10/forwardAuth/tls/caOptional` | `true` |
 | `traefik/http/middlewares/Middleware10/forwardAuth/tls/cert` | `foobar` |

docs/content/reference/dynamic-configuration/traefik.io_middlewares.yaml

@@ -492,6 +492,15 @@ spec:
                       AuthResponseHeadersRegex defines the regex to match headers to copy from the authentication server response and set on forwarded request, after stripping all headers that match the regex.
                       More info: https://doc.traefik.io/traefik/v3.2/middlewares/http/forwardauth/#authresponseheadersregex
                     type: string
+                  forwardBody:
+                    description: ForwardBody defines whether to send the request body
+                      to the authentication server.
+                    type: boolean
+                  maxBodySize:
+                    description: MaxBodySize defines the maximum body size in bytes
+                      allowed to be forwarded to the authentication server.
+                    format: int64
+                    type: integer
                   tls:
                     description: TLS defines the configuration used to secure the
                       connection to the authentication server.