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Merge branch v2.11 into v3.6

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romain 2026-01-14 11:28:12 +01:00
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7
CHANGELOG.md
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@ -1,3 +1,10 @@
## [v2.11.35](https://github.com/traefik/traefik/tree/v2.11.35) (2026-01-14)
[All Commits](https://github.com/traefik/traefik/compare/v2.11.34...v2.11.35)
**Bug fixes:**
- **[acme]** Add timeout to ACME-TLS/1 challenge handshake ([#12516](https://github.com/traefik/traefik/pull/12516) by [LBF38](https://github.com/LBF38))
- **[server]** Make encoded character options opt-in ([#12540](https://github.com/traefik/traefik/pull/12540) by [gndz07](https://github.com/gndz07))
## [v3.6.6](https://github.com/traefik/traefik/tree/v3.6.6) (2025-12-29)
[All Commits](https://github.com/traefik/traefik/compare/v3.6.5...v3.6.6)

8
cmd/traefik/traefik.go
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@ -97,10 +97,10 @@ func runCmd(staticConfiguration *static.Configuration) error {
return fmt.Errorf("setting up logger: %w", err)
}
// Display warning to advertise for new behavior of rejecting encoded characters in the request path.
// Deprecated: this has to be removed in the next minor/major version.
log.Warn().Msg("Starting with v3.6.4, Traefik now rejects some encoded characters in the request path by default. " +
"Refer to the documentation for more details: https://doc.traefik.io/traefik/migrate/v3/#encoded-characters-in-request-path")
log.Warn().Msg("Traefik can reject some encoded characters in the request path." +
"When your backend is not fully compliant with [RFC 3986](https://datatracker.ietf.org/doc/html/rfc3986)," +
"it is recommended to set these options to `false` to avoid split-view situation." +
"Refer to the documentation for more details: https://doc.traefik.io/traefik/v3.6/migrate/v3/#encoded-characters-configuration-default-values")
http.DefaultTransport.(*http.Transport).Proxy = http.ProxyFromEnvironment

12
docs/content/assets/js/extra.js
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@ -1,4 +1,14 @@
/* Highlight */
(function(hljs) {
hljs.initHighlightingOnLoad();
})(hljs);
})(hljs);
/* Scarf Analytics - cookieless, anonymous company-level intelligence */
(function() {
var img = document.createElement('img');
img.src = 'https://static.scarf.sh/a.png?x-pxid=1a49232a-b165-4015-8ed2-a1092f1f0d83';
img.referrerPolicy = 'no-referrer-when-downgrade';
img.loading = 'eager';
img.style.cssText = 'visibility:hidden;position:absolute;width:1px;height:1px;';
document.body.appendChild(img);
})();

27
docs/content/migrate/v3.md
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@ -576,3 +576,30 @@ Here is the list of the encoded characters that are rejected by default, along w
| `%23` | `#` (hash) | `entryPoints.<name>.`<br/>`.http.encodedCharacters`<br/>`.allowEncodedHash` |
Please check out the entrypoint [encodedCharacters option](../reference/install-configuration/entrypoints.md#opt-http-encodedCharacters) documentation for more details.
## v3.6.7
### Encoded Characters Configuration Default Values
Since `v3.6.7`, the options for encoded characters now have a `true` default value.
This means that Traefik will not reject requests with a path containing a specific set of encoded characters by default.
It is now up to the users to configure the security hardening of encoded characters.
Here is the list of the encoded characters that can be configured to `false` to disallow them:
| Encoded Character | Character | Config options | Default value |
|-------------------|-------------------------|--------------------------------------------------------------------------------------|---------------|
| `%2f` or `%2F` | `/` (slash) | `entryPoints.<name>`<br/>`.http.encodedCharacters`<br/>`.allowEncodedSlash` | `true` |
| `%5c` or `%5C` | `\` (backslash) | `entryPoints.<name>.`<br/>`.http.encodedCharacters`<br/>`.allowEncodedBackSlash` | `true` |
| `%00` | `NULL` (null character) | `entryPoints.<name>.`<br/>`.http.encodedCharacters`<br/>`.allowEncodedNullCharacter` | `true` |
| `%3b` or `%3B` | `;` (semicolon) | `entryPoints.<name>.`<br/>`.http.encodedCharacters`<br/>`.allowEncodedSemicolon` | `true` |
| `%25` | `%` (percent) | `entryPoints.<name>.`<br/>`.http.encodedCharacters`<br/>`.allowEncodedPercent` | `true` |
| `%3f` or `%3F` | `?` (question mark) | `entryPoints.<name>.`<br/>`.http.encodedCharacters`<br/>`.allowEncodedQuestionMark` | `true` |
| `%23` | `#` (hash) | `entryPoints.<name>.`<br/>`.http.encodedCharacters`<br/>`.allowEncodedHash` | `true` |
Note: This check is not done against query parameters,
but only against the request path as defined
in [RFC3986 section-3](https://datatracker.ietf.org/doc/html/rfc3986#section-3).
Please check out the entrypoint [encodedCharacters option](../routing/entrypoints.md#encoded-characters) documentation
for more details.

14
docs/content/reference/install-configuration/configuration-options.md
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@ -85,13 +85,13 @@ THIS FILE MUST NOT BE EDITED BY HAND
| <a id="opt-entrypoints-name-forwardedheaders-insecure" href="#opt-entrypoints-name-forwardedheaders-insecure" title="#opt-entrypoints-name-forwardedheaders-insecure">entrypoints._name_.forwardedheaders.insecure</a> | Trust all forwarded headers. | false |
| <a id="opt-entrypoints-name-forwardedheaders-trustedips" href="#opt-entrypoints-name-forwardedheaders-trustedips" title="#opt-entrypoints-name-forwardedheaders-trustedips">entrypoints._name_.forwardedheaders.trustedips</a> | Trust only forwarded headers from selected IPs. | |
| <a id="opt-entrypoints-name-http" href="#opt-entrypoints-name-http" title="#opt-entrypoints-name-http">entrypoints._name_.http</a> | HTTP configuration. | |
| <a id="opt-entrypoints-name-http-encodedcharacters-allowencodedbackslash" href="#opt-entrypoints-name-http-encodedcharacters-allowencodedbackslash" title="#opt-entrypoints-name-http-encodedcharacters-allowencodedbackslash">entrypoints._name_.http.encodedcharacters.allowencodedbackslash</a> | Defines whether requests with encoded back slash characters in the path are allowed. | false |
| <a id="opt-entrypoints-name-http-encodedcharacters-allowencodedhash" href="#opt-entrypoints-name-http-encodedcharacters-allowencodedhash" title="#opt-entrypoints-name-http-encodedcharacters-allowencodedhash">entrypoints._name_.http.encodedcharacters.allowencodedhash</a> | Defines whether requests with encoded hash characters in the path are allowed. | false |
| <a id="opt-entrypoints-name-http-encodedcharacters-allowencodednullcharacter" href="#opt-entrypoints-name-http-encodedcharacters-allowencodednullcharacter" title="#opt-entrypoints-name-http-encodedcharacters-allowencodednullcharacter">entrypoints._name_.http.encodedcharacters.allowencodednullcharacter</a> | Defines whether requests with encoded null characters in the path are allowed. | false |
| <a id="opt-entrypoints-name-http-encodedcharacters-allowencodedpercent" href="#opt-entrypoints-name-http-encodedcharacters-allowencodedpercent" title="#opt-entrypoints-name-http-encodedcharacters-allowencodedpercent">entrypoints._name_.http.encodedcharacters.allowencodedpercent</a> | Defines whether requests with encoded percent characters in the path are allowed. | false |
| <a id="opt-entrypoints-name-http-encodedcharacters-allowencodedquestionmark" href="#opt-entrypoints-name-http-encodedcharacters-allowencodedquestionmark" title="#opt-entrypoints-name-http-encodedcharacters-allowencodedquestionmark">entrypoints._name_.http.encodedcharacters.allowencodedquestionmark</a> | Defines whether requests with encoded question mark characters in the path are allowed. | false |
| <a id="opt-entrypoints-name-http-encodedcharacters-allowencodedsemicolon" href="#opt-entrypoints-name-http-encodedcharacters-allowencodedsemicolon" title="#opt-entrypoints-name-http-encodedcharacters-allowencodedsemicolon">entrypoints._name_.http.encodedcharacters.allowencodedsemicolon</a> | Defines whether requests with encoded semicolon characters in the path are allowed. | false |
| <a id="opt-entrypoints-name-http-encodedcharacters-allowencodedslash" href="#opt-entrypoints-name-http-encodedcharacters-allowencodedslash" title="#opt-entrypoints-name-http-encodedcharacters-allowencodedslash">entrypoints._name_.http.encodedcharacters.allowencodedslash</a> | Defines whether requests with encoded slash characters in the path are allowed. | false |
| <a id="opt-entrypoints-name-http-encodedcharacters-allowencodedbackslash" href="#opt-entrypoints-name-http-encodedcharacters-allowencodedbackslash" title="#opt-entrypoints-name-http-encodedcharacters-allowencodedbackslash">entrypoints._name_.http.encodedcharacters.allowencodedbackslash</a> | Defines whether requests with encoded back slash characters in the path are allowed. | true |
| <a id="opt-entrypoints-name-http-encodedcharacters-allowencodedhash" href="#opt-entrypoints-name-http-encodedcharacters-allowencodedhash" title="#opt-entrypoints-name-http-encodedcharacters-allowencodedhash">entrypoints._name_.http.encodedcharacters.allowencodedhash</a> | Defines whether requests with encoded hash characters in the path are allowed. | true |
| <a id="opt-entrypoints-name-http-encodedcharacters-allowencodednullcharacter" href="#opt-entrypoints-name-http-encodedcharacters-allowencodednullcharacter" title="#opt-entrypoints-name-http-encodedcharacters-allowencodednullcharacter">entrypoints._name_.http.encodedcharacters.allowencodednullcharacter</a> | Defines whether requests with encoded null characters in the path are allowed. | true |
| <a id="opt-entrypoints-name-http-encodedcharacters-allowencodedpercent" href="#opt-entrypoints-name-http-encodedcharacters-allowencodedpercent" title="#opt-entrypoints-name-http-encodedcharacters-allowencodedpercent">entrypoints._name_.http.encodedcharacters.allowencodedpercent</a> | Defines whether requests with encoded percent characters in the path are allowed. | true |
| <a id="opt-entrypoints-name-http-encodedcharacters-allowencodedquestionmark" href="#opt-entrypoints-name-http-encodedcharacters-allowencodedquestionmark" title="#opt-entrypoints-name-http-encodedcharacters-allowencodedquestionmark">entrypoints._name_.http.encodedcharacters.allowencodedquestionmark</a> | Defines whether requests with encoded question mark characters in the path are allowed. | true |
| <a id="opt-entrypoints-name-http-encodedcharacters-allowencodedsemicolon" href="#opt-entrypoints-name-http-encodedcharacters-allowencodedsemicolon" title="#opt-entrypoints-name-http-encodedcharacters-allowencodedsemicolon">entrypoints._name_.http.encodedcharacters.allowencodedsemicolon</a> | Defines whether requests with encoded semicolon characters in the path are allowed. | true |
| <a id="opt-entrypoints-name-http-encodedcharacters-allowencodedslash" href="#opt-entrypoints-name-http-encodedcharacters-allowencodedslash" title="#opt-entrypoints-name-http-encodedcharacters-allowencodedslash">entrypoints._name_.http.encodedcharacters.allowencodedslash</a> | Defines whether requests with encoded slash characters in the path are allowed. | true |
| <a id="opt-entrypoints-name-http-encodequerysemicolons" href="#opt-entrypoints-name-http-encodequerysemicolons" title="#opt-entrypoints-name-http-encodequerysemicolons">entrypoints._name_.http.encodequerysemicolons</a> | Defines whether request query semicolons should be URLEncoded. | false |
| <a id="opt-entrypoints-name-http-maxheaderbytes" href="#opt-entrypoints-name-http-maxheaderbytes" title="#opt-entrypoints-name-http-maxheaderbytes">entrypoints._name_.http.maxheaderbytes</a> | Maximum size of request headers in bytes. | 1048576 |
| <a id="opt-entrypoints-name-http-middlewares" href="#opt-entrypoints-name-http-middlewares" title="#opt-entrypoints-name-http-middlewares">entrypoints._name_.http.middlewares</a> | Default middlewares for the routers linked to the entry point. | |

36
docs/content/reference/install-configuration/entrypoints.md
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@ -84,8 +84,8 @@ additionalArguments:
## Configuration Options
| Field | Description | Default | Required |
|:----------------------------------------------------------------|:------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|:------------------------|:---------|
| Field | Description | Default | Required |
|:-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|:------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|:------------------------|:---------|
| <a id="opt-address" href="#opt-address" title="#opt-address">`address`</a> | Define the port, and optionally the hostname, on which to listen for incoming connections and packets.<br /> It also defines the protocol to use (TCP or UDP).<br /> If no protocol is specified, the default is TCP. The format is:`[host]:port[/tcp\|/udp] | - | Yes |
| <a id="opt-asDefault" href="#opt-asDefault" title="#opt-asDefault">`asDefault`</a> | Mark the `entryPoint` to be in the list of default `entryPoints`.<br /> `entryPoints`in this list are used (by default) on HTTP and TCP routers that do not define their own `entryPoints` option.<br /> More information [here](#asdefault). | false | No |
| <a id="opt-forwardedHeaders-trustedIPs" href="#opt-forwardedHeaders-trustedIPs" title="#opt-forwardedHeaders-trustedIPs">`forwardedHeaders.trustedIPs`</a> | Set the IPs or CIDR from where Traefik trusts the forwarded headers information (`X-Forwarded-*`). | - | No |
@ -95,16 +95,16 @@ additionalArguments:
| <a id="opt-http-redirections-entryPoint-permanent" href="#opt-http-redirections-entryPoint-permanent" title="#opt-http-redirections-entryPoint-permanent">`http.redirections.`<br />`entryPoint.permanent`</a> | Enable permanent redirecting of all incoming requests on an entry point to another one changing the scheme. <br /> The target element, it can be an entry point name (ex: `websecure`), or a port (`:443`). | false | No |
| <a id="opt-http-redirections-entryPoint-priority" href="#opt-http-redirections-entryPoint-priority" title="#opt-http-redirections-entryPoint-priority">`http.redirections.`<br />`entryPoint.priority`</a> | Default priority applied to the routers attached to the `entryPoint`. | MaxInt32-1 (2147483646) | No |
| <a id="opt-http-encodedCharacters" href="#opt-http-encodedCharacters" title="#opt-http-encodedCharacters">`http.encodedCharacters`</a> | Defines which encoded characters are allowed in the request path. More information [here](#encoded-characters). | false | No |
| <a id="opt-http-encodedCharacters-allowEncodedSlash" href="#opt-http-encodedCharacters-allowEncodedSlash" title="#opt-http-encodedCharacters-allowEncodedSlash">`http.encodedCharacters.`<br />`allowEncodedSlash`</a> | Defines whether requests with encoded slash characters in the path are allowed. | false | No |
| <a id="opt-http-encodedCharacters-allowEncodedBackSlash" href="#opt-http-encodedCharacters-allowEncodedBackSlash" title="#opt-http-encodedCharacters-allowEncodedBackSlash">`http.encodedCharacters.`<br />`allowEncodedBackSlash`</a> | Defines whether requests with encoded back slash characters in the path are allowed. | false | No |
| <a id="opt-http-encodedCharacters-allowEncodedNullCharacter" href="#opt-http-encodedCharacters-allowEncodedNullCharacter" title="#opt-http-encodedCharacters-allowEncodedNullCharacter">`http.encodedCharacters.`<br />`allowEncodedNullCharacter`</a> | Defines whether requests with encoded null characters in the path are allowed. | false | No |
| <a id="opt-http-encodedCharacters-allowEncodedSemicolon" href="#opt-http-encodedCharacters-allowEncodedSemicolon" title="#opt-http-encodedCharacters-allowEncodedSemicolon">`http.encodedCharacters.`<br />`allowEncodedSemicolon`</a> | Defines whether requests with encoded semicolon characters in the path are allowed. | false | No |
| <a id="opt-http-encodedCharacters-allowEncodedPercent" href="#opt-http-encodedCharacters-allowEncodedPercent" title="#opt-http-encodedCharacters-allowEncodedPercent">`http.encodedCharacters.`<br />`allowEncodedPercent`</a> | Defines whether requests with encoded percent characters in the path are allowed. | false | No |
| <a id="opt-http-encodedCharacters-allowEncodedQuestionMark" href="#opt-http-encodedCharacters-allowEncodedQuestionMark" title="#opt-http-encodedCharacters-allowEncodedQuestionMark">`http.encodedCharacters.`<br />`allowEncodedQuestionMark`</a> | Defines whether requests with encoded question mark characters in the path are allowed. | false | No |
| <a id="opt-http-encodedCharacters-allowEncodedHash" href="#opt-http-encodedCharacters-allowEncodedHash" title="#opt-http-encodedCharacters-allowEncodedHash">`http.encodedCharacters.`<br />`allowEncodedHash`</a> | Defines whether requests with encoded hash characters in the path are allowed. | false | No |
| <a id="opt-http-encodedCharacters-allowEncodedSlash" href="#opt-http-encodedCharacters-allowEncodedSlash" title="#opt-http-encodedCharacters-allowEncodedSlash">`http.encodedCharacters.`<br />`allowEncodedSlash`</a> | Defines whether requests with encoded slash characters in the path are allowed. | true | No |
| <a id="opt-http-encodedCharacters-allowEncodedBackSlash" href="#opt-http-encodedCharacters-allowEncodedBackSlash" title="#opt-http-encodedCharacters-allowEncodedBackSlash">`http.encodedCharacters.`<br />`allowEncodedBackSlash`</a> | Defines whether requests with encoded back slash characters in the path are allowed. | true | No |
| <a id="opt-http-encodedCharacters-allowEncodedNullCharacter" href="#opt-http-encodedCharacters-allowEncodedNullCharacter" title="#opt-http-encodedCharacters-allowEncodedNullCharacter">`http.encodedCharacters.`<br />`allowEncodedNullCharacter`</a> | Defines whether requests with encoded null characters in the path are allowed. | true | No |
| <a id="opt-http-encodedCharacters-allowEncodedSemicolon" href="#opt-http-encodedCharacters-allowEncodedSemicolon" title="#opt-http-encodedCharacters-allowEncodedSemicolon">`http.encodedCharacters.`<br />`allowEncodedSemicolon`</a> | Defines whether requests with encoded semicolon characters in the path are allowed. | true | No |
| <a id="opt-http-encodedCharacters-allowEncodedPercent" href="#opt-http-encodedCharacters-allowEncodedPercent" title="#opt-http-encodedCharacters-allowEncodedPercent">`http.encodedCharacters.`<br />`allowEncodedPercent`</a> | Defines whether requests with encoded percent characters in the path are allowed. | true | No |
| <a id="opt-http-encodedCharacters-allowEncodedQuestionMark" href="#opt-http-encodedCharacters-allowEncodedQuestionMark" title="#opt-http-encodedCharacters-allowEncodedQuestionMark">`http.encodedCharacters.`<br />`allowEncodedQuestionMark`</a> | Defines whether requests with encoded question mark characters in the path are allowed. | true | No |
| <a id="opt-http-encodedCharacters-allowEncodedHash" href="#opt-http-encodedCharacters-allowEncodedHash" title="#opt-http-encodedCharacters-allowEncodedHash">`http.encodedCharacters.`<br />`allowEncodedHash`</a> | Defines whether requests with encoded hash characters in the path are allowed. | true | No |
| <a id="opt-http-encodeQuerySemicolons" href="#opt-http-encodeQuerySemicolons" title="#opt-http-encodeQuerySemicolons">`http.encodeQuerySemicolons`</a> | Enable query semicolons encoding. <br /> Use this option to avoid non-encoded semicolons to be interpreted as query parameter separators by Traefik. <br /> When using this option, the non-encoded semicolons characters in query will be transmitted encoded to the backend.<br /> More information [here](#encodequerysemicolons). | false | No |
| <a id="opt-http-sanitizePath" href="#opt-http-sanitizePath" title="#opt-http-sanitizePath">`http.sanitizePath`</a> | Defines whether to enable the request path sanitization.<br /> More information [here](#sanitizepath). | false | No |
| <a id="opt-http-maxHeaderBytes" href="#opt-http-maxHeaderBytes" title="#opt-http-maxHeaderBytes">`http.maxHeaderBytes`</a> | Set the maximum size of request headers in bytes. | 1048576 | No |
| <a id="opt-http-maxHeaderBytes" href="#opt-http-maxHeaderBytes" title="#opt-http-maxHeaderBytes">`http.maxHeaderBytes`</a> | Set the maximum size of request headers in bytes. | 1048576 | No |
| <a id="opt-http-middlewares" href="#opt-http-middlewares" title="#opt-http-middlewares">`http.middlewares`</a> | Set the list of middlewares that are prepended by default to the list of middlewares of each router associated to the named entry point. <br />More information [here](#httpmiddlewares). | - | No |
| <a id="opt-http-tls" href="#opt-http-tls" title="#opt-http-tls">`http.tls`</a> | Enable TLS on every router attached to the `entryPoint`. <br /> If no certificate are set, a default self-signed certificate is generated by Traefik. <br /> We recommend to not use self signed certificates in production. | - | No |
| <a id="opt-http-tls-options" href="#opt-http-tls-options" title="#opt-http-tls-options">`http.tls.options`</a> | Apply TLS options on every router attached to the `entryPoint`. <br /> The TLS options can be overidden per router. <br /> More information in the [dedicated section](../../routing/providers/kubernetes-crd.md#kind-tlsoption). | - | No |
@ -220,16 +220,22 @@ it can lead to unsafe routing when the `sanitizePath` option is set to `false`.
### Encoded Characters
You can configure Traefik to control the handling of encoded characters in request paths for security purposes.
By default, Traefik rejects requests containing certain encoded characters that could be used in path traversal or other security attacks.
By default, Traefik do not reject requests with path containing certain encoded characters that could be used in path traversal or other security attacks.
!!! warning "Security Considerations"
!!! info
This check is not done against the request query parameters,
but only against the request path as defined in [RFC3986 section-3](https://datatracker.ietf.org/doc/html/rfc3986#section-3).
Allowing certain encoded characters may expose your application to security vulnerabilities.
!!! info "Security Considerations"
When your backend is not fully compliant with [RFC 3986](https://datatracker.ietf.org/doc/html/rfc3986) and notably decode encoded reserved characters in the requets path,
it is recommended to set these options to `false` to avoid split-view situation and helps prevent path traversal attacks or other malicious attempts to bypass security controls.
Here is the list of the encoded characters that are rejected by default:
| Encoded Character | Character |
|-------------------|-------------------------|
| Encoded Character | Character |
|------------------------------------------------------------------------------------|-------------------------|
| <a id="opt-2f-or-2F" href="#opt-2f-or-2F" title="#opt-2f-or-2F">`%2f` or `%2F`</a> | `/` (slash) |
| <a id="opt-5c-or-5C" href="#opt-5c-or-5C" title="#opt-5c-or-5C">`%5c` or `%5C`</a> | `\` (backslash) |
| <a id="opt-00" href="#opt-00" title="#opt-00">`%00`</a> | `NULL` (null character) |

14
docs/content/reference/static-configuration/cli-ref.md
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@ -238,25 +238,25 @@ Trust only forwarded headers from selected IPs.
HTTP configuration.
`--entrypoints.<name>.http.encodedcharacters.allowencodedbackslash`:
Defines whether requests with encoded back slash characters in the path are allowed. (Default: ```false```)
Defines whether requests with encoded back slash characters in the path are allowed. (Default: ```true```)
`--entrypoints.<name>.http.encodedcharacters.allowencodedhash`:
Defines whether requests with encoded hash characters in the path are allowed. (Default: ```false```)
Defines whether requests with encoded hash characters in the path are allowed. (Default: ```true```)
`--entrypoints.<name>.http.encodedcharacters.allowencodednullcharacter`:
Defines whether requests with encoded null characters in the path are allowed. (Default: ```false```)
Defines whether requests with encoded null characters in the path are allowed. (Default: ```true```)
`--entrypoints.<name>.http.encodedcharacters.allowencodedpercent`:
Defines whether requests with encoded percent characters in the path are allowed. (Default: ```false```)
Defines whether requests with encoded percent characters in the path are allowed. (Default: ```true```)
`--entrypoints.<name>.http.encodedcharacters.allowencodedquestionmark`:
Defines whether requests with encoded question mark characters in the path are allowed. (Default: ```false```)
Defines whether requests with encoded question mark characters in the path are allowed. (Default: ```true```)
`--entrypoints.<name>.http.encodedcharacters.allowencodedsemicolon`:
Defines whether requests with encoded semicolon characters in the path are allowed. (Default: ```false```)
Defines whether requests with encoded semicolon characters in the path are allowed. (Default: ```true```)
`--entrypoints.<name>.http.encodedcharacters.allowencodedslash`:
Defines whether requests with encoded slash characters in the path are allowed. (Default: ```false```)
Defines whether requests with encoded slash characters in the path are allowed. (Default: ```true```)
`--entrypoints.<name>.http.encodequerysemicolons`:
Defines whether request query semicolons should be URLEncoded. (Default: ```false```)

14
docs/content/reference/static-configuration/env-ref.md
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@ -247,25 +247,25 @@ HTTP/3 configuration. (Default: ```false```)
UDP port to advertise, on which HTTP/3 is available. (Default: ```0```)
`TRAEFIK_ENTRYPOINTS_<NAME>_HTTP_ENCODEDCHARACTERS_ALLOWENCODEDBACKSLASH`:
Defines whether requests with encoded back slash characters in the path are allowed. (Default: ```false```)
Defines whether requests with encoded back slash characters in the path are allowed. (Default: ```true```)
`TRAEFIK_ENTRYPOINTS_<NAME>_HTTP_ENCODEDCHARACTERS_ALLOWENCODEDHASH`:
Defines whether requests with encoded hash characters in the path are allowed. (Default: ```false```)
Defines whether requests with encoded hash characters in the path are allowed. (Default: ```true```)
`TRAEFIK_ENTRYPOINTS_<NAME>_HTTP_ENCODEDCHARACTERS_ALLOWENCODEDNULLCHARACTER`:
Defines whether requests with encoded null characters in the path are allowed. (Default: ```false```)
Defines whether requests with encoded null characters in the path are allowed. (Default: ```true```)
`TRAEFIK_ENTRYPOINTS_<NAME>_HTTP_ENCODEDCHARACTERS_ALLOWENCODEDPERCENT`:
Defines whether requests with encoded percent characters in the path are allowed. (Default: ```false```)
Defines whether requests with encoded percent characters in the path are allowed. (Default: ```true```)
`TRAEFIK_ENTRYPOINTS_<NAME>_HTTP_ENCODEDCHARACTERS_ALLOWENCODEDQUESTIONMARK`:
Defines whether requests with encoded question mark characters in the path are allowed. (Default: ```false```)
Defines whether requests with encoded question mark characters in the path are allowed. (Default: ```true```)
`TRAEFIK_ENTRYPOINTS_<NAME>_HTTP_ENCODEDCHARACTERS_ALLOWENCODEDSEMICOLON`:
Defines whether requests with encoded semicolon characters in the path are allowed. (Default: ```false```)
Defines whether requests with encoded semicolon characters in the path are allowed. (Default: ```true```)
`TRAEFIK_ENTRYPOINTS_<NAME>_HTTP_ENCODEDCHARACTERS_ALLOWENCODEDSLASH`:
Defines whether requests with encoded slash characters in the path are allowed. (Default: ```false```)
Defines whether requests with encoded slash characters in the path are allowed. (Default: ```true```)
`TRAEFIK_ENTRYPOINTS_<NAME>_HTTP_ENCODEQUERYSEMICOLONS`:
Defines whether request query semicolons should be URLEncoded. (Default: ```false```)

105
docs/content/routing/entrypoints.md
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@ -131,13 +131,13 @@ They can be defined by using a file (YAML or TOML) or CLI arguments.
- "192.168.0.1"
http:
encodedCharacters:
allowEncodedSlash: true
allowEncodedBackSlash: true
allowEncodedNullCharacter: true
allowEncodedSemicolon: true
allowEncodedPercent: true
allowEncodedQuestionMark: true
allowEncodedHash: true
allowEncodedSlash: false
allowEncodedBackSlash: false
allowEncodedNullCharacter: false
allowEncodedSemicolon: false
allowEncodedPercent: false
allowEncodedQuestionMark: false
allowEncodedHash: false
```
```toml tab="File (TOML)"
@ -166,13 +166,13 @@ They can be defined by using a file (YAML or TOML) or CLI arguments.
insecure = true
trustedIPs = ["127.0.0.1", "192.168.0.1"]
[entryPoints.name.http.encodedCharacters]
allowEncodedSlash = true
allowEncodedBackSlash = true
allowEncodedNullCharacter = true
allowEncodedSemicolon = true
allowEncodedPercent = true
allowEncodedQuestionMark = true
allowEncodedHash = true
allowEncodedSlash = false
allowEncodedBackSlash = false
allowEncodedNullCharacter = false
allowEncodedSemicolon = false
allowEncodedPercent = false
allowEncodedQuestionMark = false
allowEncodedHash = false
```
```bash tab="CLI"
@ -191,13 +191,13 @@ They can be defined by using a file (YAML or TOML) or CLI arguments.
--entryPoints.name.proxyProtocol.trustedIPs=127.0.0.1,192.168.0.1
--entryPoints.name.forwardedHeaders.insecure=true
--entryPoints.name.forwardedHeaders.trustedIPs=127.0.0.1,192.168.0.1
--entryPoints.name.http.encodedCharacters.allowEncodedSlash=true
--entryPoints.name.http.encodedCharacters.allowEncodedBackSlash=true
--entryPoints.name.http.encodedCharacters.allowEncodedNullCharacter=true
--entryPoints.name.http.encodedCharacters.allowEncodedSemicolon=true
--entryPoints.name.http.encodedCharacters.allowEncodedPercent=true
--entryPoints.name.http.encodedCharacters.allowEncodedQuestionMark=true
--entryPoints.name.http.encodedCharacters.allowEncodedHash=true
--entryPoints.name.http.encodedCharacters.allowEncodedSlash=false
--entryPoints.name.http.encodedCharacters.allowEncodedBackSlash=false
--entryPoints.name.http.encodedCharacters.allowEncodedNullCharacter=false
--entryPoints.name.http.encodedCharacters.allowEncodedSemicolon=false
--entryPoints.name.http.encodedCharacters.allowEncodedPercent=false
--entryPoints.name.http.encodedCharacters.allowEncodedQuestionMark=false
--entryPoints.name.http.encodedCharacters.allowEncodedHash=false
```
### Address
@ -1180,20 +1180,21 @@ entryPoints:
### Encoded Characters
You can configure Traefik to control the handling of encoded characters in request paths for security purposes.
By default, Traefik rejects requests with path containing certain encoded characters that could be used in path traversal or other security attacks.
By default, Traefik do not reject requests with path containing certain encoded characters that could be used in path traversal or other security attacks.
!!! info
This check is not done against the request query parameters,
but only against the request path as defined in [RFC3986 section-3](https://datatracker.ietf.org/doc/html/rfc3986#section-3).
!!! warning "Security Considerations"
!!! info "Security Considerations"
Allowing certain encoded characters may expose your application to security vulnerabilities.
When your backend is not fully compliant with [RFC 3986](https://datatracker.ietf.org/doc/html/rfc3986) and notably decode encoded reserved characters in the requets path,
it is recommended to set these options to `false` to avoid split-view situation and helps prevent path traversal attacks or other malicious attempts to bypass security controls.
??? info "`encodedCharacters.allowEncodedSlash`"
_Optional, Default=false_
_Optional, Default=true_
Controls whether requests with encoded slash characters (`%2F` or `%2f`) in the path are allowed.
@ -1204,7 +1205,7 @@ By default, Traefik rejects requests with path containing certain encoded charac
address: ":80"
http:
encodedCharacters:
allowEncodedSlash: true
allowEncodedSlash: false
```
```toml tab="File (TOML)"
@ -1214,18 +1215,18 @@ By default, Traefik rejects requests with path containing certain encoded charac
address = ":80"
[entryPoints.web.http.encodedCharacters]
allowEncodedSlash = true
allowEncodedSlash = false
```
```bash tab="CLI"
## Static configuration
--entryPoints.web.address=:80
--entryPoints.web.http.encodedCharacters.allowEncodedSlash=true
--entryPoints.web.http.encodedCharacters.allowEncodedSlash=false
```
??? info "`encodedCharacters.allowEncodedBackSlash`"
_Optional, Default=false_
_Optional, Default=true_
Controls whether requests with encoded back slash characters (`%5C` or `%5c`) in the path are allowed.
@ -1236,7 +1237,7 @@ By default, Traefik rejects requests with path containing certain encoded charac
address: ":80"
http:
encodedCharacters:
allowEncodedBackSlash: true
allowEncodedBackSlash: false
```
```toml tab="File (TOML)"
@ -1246,18 +1247,18 @@ By default, Traefik rejects requests with path containing certain encoded charac
address = ":80"
[entryPoints.web.http.encodedCharacters]
allowEncodedBackSlash = true
allowEncodedBackSlash = false
```
```bash tab="CLI"
## Static configuration
--entryPoints.web.address=:80
--entryPoints.web.http.encodedCharacters.allowEncodedBackSlash=true
--entryPoints.web.http.encodedCharacters.allowEncodedBackSlash=false
```
??? info "`encodedCharacters.allowEncodedNullCharacter`"
_Optional, Default=false_
_Optional, Default=true_
Controls whether requests with encoded null characters (`%00`) in the path are allowed.
@ -1268,7 +1269,7 @@ By default, Traefik rejects requests with path containing certain encoded charac
address: ":80"
http:
encodedCharacters:
allowEncodedNullCharacter: true
allowEncodedNullCharacter: false
```
```toml tab="File (TOML)"
@ -1278,18 +1279,18 @@ By default, Traefik rejects requests with path containing certain encoded charac
address = ":80"
[entryPoints.web.http.encodedCharacters]
allowEncodedNullCharacter = true
allowEncodedNullCharacter = false
```
```bash tab="CLI"
## Static configuration
--entryPoints.web.address=:80
--entryPoints.web.http.encodedCharacters.allowEncodedNullCharacter=true
--entryPoints.web.http.encodedCharacters.allowEncodedNullCharacter=false
```
??? info "`encodedCharacters.allowEncodedSemicolon`"
_Optional, Default=false_
_Optional, Default=true_
Controls whether requests with encoded semicolon characters (`%3B` or `%3b`) in the path are allowed.
@ -1300,7 +1301,7 @@ By default, Traefik rejects requests with path containing certain encoded charac
address: ":80"
http:
encodedCharacters:
allowEncodedSemicolon: true
allowEncodedSemicolon: false
```
```toml tab="File (TOML)"
@ -1310,18 +1311,18 @@ By default, Traefik rejects requests with path containing certain encoded charac
address = ":80"
[entryPoints.web.http.encodedCharacters]
allowEncodedSemicolon = true
allowEncodedSemicolon = false
```
```bash tab="CLI"
## Static configuration
--entryPoints.web.address=:80
--entryPoints.web.http.encodedCharacters.allowEncodedSemicolon=true
--entryPoints.web.http.encodedCharacters.allowEncodedSemicolon=false
```
??? info "`encodedCharacters.allowEncodedPercent`"
_Optional, Default=false_
_Optional, Default=true_
Controls whether requests with encoded percent characters (`%25`) in the path are allowed.
@ -1332,7 +1333,7 @@ By default, Traefik rejects requests with path containing certain encoded charac
address: ":80"
http:
encodedCharacters:
allowEncodedPercent: true
allowEncodedPercent: false
```
```toml tab="File (TOML)"
@ -1342,18 +1343,18 @@ By default, Traefik rejects requests with path containing certain encoded charac
address = ":80"
[entryPoints.web.http.encodedCharacters]
allowEncodedPercent = true
allowEncodedPercent = false
```
```bash tab="CLI"
## Static configuration
--entryPoints.web.address=:80
--entryPoints.web.http.encodedCharacters.allowEncodedPercent=true
--entryPoints.web.http.encodedCharacters.allowEncodedPercent=false
```
??? info "`encodedCharacters.allowEncodedQuestionMark`"
_Optional, Default=false_
_Optional, Default=true_
Controls whether requests with encoded question mark characters (`%3F` or `%3f`) in the path are allowed.
@ -1364,7 +1365,7 @@ By default, Traefik rejects requests with path containing certain encoded charac
address: ":80"
http:
encodedCharacters:
allowEncodedQuestionMark: true
allowEncodedQuestionMark: false
```
```toml tab="File (TOML)"
@ -1374,18 +1375,18 @@ By default, Traefik rejects requests with path containing certain encoded charac
address = ":80"
[entryPoints.web.http.encodedCharacters]
allowEncodedQuestionMark = true
allowEncodedQuestionMark = false
```
```bash tab="CLI"
## Static configuration
--entryPoints.web.address=:80
--entryPoints.web.http.encodedCharacters.allowEncodedQuestionMark=true
--entryPoints.web.http.encodedCharacters.allowEncodedQuestionMark=false
```
??? info "`encodedCharacters.allowEncodedHash`"
_Optional, Default=false_
_Optional, Default=true_
Controls whether requests with encoded hash characters (`%23`) in the path are allowed.
@ -1396,7 +1397,7 @@ By default, Traefik rejects requests with path containing certain encoded charac
address: ":80"
http:
encodedCharacters:
allowEncodedHash: true
allowEncodedHash: false
```
```toml tab="File (TOML)"
@ -1406,13 +1407,13 @@ By default, Traefik rejects requests with path containing certain encoded charac
address = ":80"
[entryPoints.web.http.encodedCharacters]
allowEncodedHash = true
allowEncodedHash = false
```
```bash tab="CLI"
## Static configuration
--entryPoints.web.address=:80
--entryPoints.web.http.encodedCharacters.allowEncodedHash=true
--entryPoints.web.http.encodedCharacters.allowEncodedHash=false
```
### SanitizePath

23
docs/content/security/request-path.md
View file

@ -20,7 +20,7 @@ When Traefik receives an HTTP request, it processes the request path through sev
Traefik inspects the path for potentially dangerous encoded characters and rejects requests containing them unless explicitly allowed.
Here is the list of the encoded characters that are rejected by default:
Here is the list of the encoded characters that are allowed by default:
| Encoded Character | Character |
|-------------------|-------------------------|
@ -87,7 +87,12 @@ Configure it in the [EntryPoints](../routing/entrypoints.md#encoded-characters)
This filtering occurs before path sanitization and catches attack attempts that use encoding to bypass other security controls.
All encoded character filtering is enabled by default (`false` means encoded characters are rejected), providing maximum security:
All encoded character filtering is disabled by default (`true` means encoded characters are allowed).
!!! info "Security Considerations"
When your backend is not fully compliant with [RFC 3986](https://datatracker.ietf.org/doc/html/rfc3986) and notably decode encoded reserved characters in the requets path,
it is recommended to set these options to `false` to avoid split-view situation and helps prevent path traversal attacks or other malicious attempts to bypass security controls.
```yaml tab="File (YAML)"
entryPoints:
@ -95,13 +100,13 @@ entryPoints:
address: ":443"
http:
encodedCharacters:
allowEncodedSlash: false # %2F - Default: false (RECOMMENDED)
allowEncodedBackSlash: false # %5C - Default: false (RECOMMENDED)
allowEncodedNullCharacter: false # %00 - Default: false (RECOMMENDED)
allowEncodedSemicolon: false # %3B - Default: false (RECOMMENDED)
allowEncodedPercent: false # %25 - Default: false (RECOMMENDED)
allowEncodedQuestionMark: false # %3F - Default: false (RECOMMENDED)
allowEncodedHash: false # %23 - Default: false (RECOMMENDED)
allowEncodedSlash: false # %2F - Default: true
allowEncodedBackSlash: false # %5C - Default: true
allowEncodedNullCharacter: false # %00 - Default: true
allowEncodedSemicolon: false # %3B - Default: true
allowEncodedPercent: false # %25 - Default: true
allowEncodedQuestionMark: false # %3F - Default: true
allowEncodedHash: false # %23 - Default: true
```
```toml tab="File (TOML)"

10
integration/fixtures/simple_encoded_chars.toml
View file

@ -8,12 +8,18 @@
[entryPoints]
[entryPoints.strict]
address = ":8000"
# Default: no encoded characters allowed
[entryPoints.strict.http.encodedCharacters]
allowEncodedSlash = false
[entryPoints.permissive]
address = ":8001"
# No config, default values should apply
[entryPoints.permissive2]
address = ":8002"
# No config for allowEncodedSlash, default value is effectively true
[entryPoints.permissive.http.encodedCharacters]
allowEncodedSlash = true
allowEncodedBackSlash = false
[api]
insecure = true

2
integration/fixtures/websocket/config.toml
View file

@ -9,8 +9,6 @@
[entryPoints]
[entryPoints.web]
address = ":8000"
[entryPoints.web.http.encodedCharacters]
allowEncodedSlash = true
[api]
insecure = true

12
integration/simple_test.go
View file

@ -2131,6 +2131,12 @@ func (s *SimpleSuite) TestEncodedCharactersDifferentEntryPoints() {
target: "127.0.0.1:8001", // permissive entry point
expected: http.StatusOK,
},
{
desc: "Encoded slash should be ALLOWED on permissive2 entry point",
request: "GET /path%2Fwith%2Fslash HTTP/1.1\r\nHost: test.localhost\r\n\r\n",
target: "127.0.0.1:8002", // permissive2 entry point
expected: http.StatusOK,
},
{
desc: "Regular path should work on strict entry point",
request: "GET /regular/path HTTP/1.1\r\nHost: test.localhost\r\n\r\n",
@ -2143,6 +2149,12 @@ func (s *SimpleSuite) TestEncodedCharactersDifferentEntryPoints() {
target: "127.0.0.1:8001",
expected: http.StatusOK,
},
{
desc: "Regular path should work on permissive2 entry point",
request: "GET /regular/path HTTP/1.1\r\nHost: test.localhost\r\n\r\n",
target: "127.0.0.1:8002",
expected: http.StatusOK,
},
}
for _, test := range testCases {

12
pkg/config/dynamic/http_config.go
View file

@ -72,12 +72,12 @@ type Router struct {
Rule string `json:"rule,omitempty" toml:"rule,omitempty" yaml:"rule,omitempty"`
ParentRefs []string `json:"parentRefs,omitempty" toml:"parentRefs,omitempty" yaml:"parentRefs,omitempty" label:"-" export:"true"`
// Deprecated: Please do not use this field and rewrite the router rules to use the v3 syntax.
RuleSyntax string `json:"ruleSyntax,omitempty" toml:"ruleSyntax,omitempty" yaml:"ruleSyntax,omitempty" export:"true"`
Priority int `json:"priority,omitempty" toml:"priority,omitempty,omitzero" yaml:"priority,omitempty" export:"true"`
TLS *RouterTLSConfig `json:"tls,omitempty" toml:"tls,omitempty" yaml:"tls,omitempty" label:"allowEmpty" file:"allowEmpty" kv:"allowEmpty" export:"true"`
Observability *RouterObservabilityConfig `json:"observability,omitempty" toml:"observability,omitempty" yaml:"observability,omitempty" export:"true"`
DefaultRule bool `json:"-" toml:"-" yaml:"-" label:"-" file:"-"`
DeniedEncodedPathCharacters RouterDeniedEncodedPathCharacters `json:"-" toml:"-" yaml:"-" label:"-" file:"-"`
RuleSyntax string `json:"ruleSyntax,omitempty" toml:"ruleSyntax,omitempty" yaml:"ruleSyntax,omitempty" export:"true"`
Priority int `json:"priority,omitempty" toml:"priority,omitempty,omitzero" yaml:"priority,omitempty" export:"true"`
TLS *RouterTLSConfig `json:"tls,omitempty" toml:"tls,omitempty" yaml:"tls,omitempty" label:"allowEmpty" file:"allowEmpty" kv:"allowEmpty" export:"true"`
Observability *RouterObservabilityConfig `json:"observability,omitempty" toml:"observability,omitempty" yaml:"observability,omitempty" export:"true"`
DefaultRule bool `json:"-" toml:"-" yaml:"-" label:"-" file:"-"`
DeniedEncodedPathCharacters *RouterDeniedEncodedPathCharacters `json:"-" toml:"-" yaml:"-" label:"-" file:"-" kv:"-"`
}
// +k8s:deepcopy-gen=true

6
pkg/config/dynamic/zz_generated.deepcopy.go
View file

@ -1389,7 +1389,11 @@ func (in *Router) DeepCopyInto(out *Router) {
*out = new(RouterObservabilityConfig)
(*in).DeepCopyInto(*out)
}
out.DeniedEncodedPathCharacters = in.DeniedEncodedPathCharacters
if in.DeniedEncodedPathCharacters != nil {
in, out := &in.DeniedEncodedPathCharacters, &out.DeniedEncodedPathCharacters
*out = new(RouterDeniedEncodedPathCharacters)
**out = **in
}
return
}

10
pkg/config/static/entrypoints.go
View file

@ -92,6 +92,16 @@ type EncodedCharacters struct {
AllowEncodedHash bool `description:"Defines whether requests with encoded hash characters in the path are allowed." json:"allowEncodedHash,omitempty" toml:"allowEncodedHash,omitempty" yaml:"allowEncodedHash,omitempty" export:"true"`
}
func (ec *EncodedCharacters) SetDefaults() {
ec.AllowEncodedSlash = true
ec.AllowEncodedBackSlash = true
ec.AllowEncodedNullCharacter = true
ec.AllowEncodedSemicolon = true
ec.AllowEncodedPercent = true
ec.AllowEncodedQuestionMark = true
ec.AllowEncodedHash = true
}
// HTTP2Config is the HTTP2 configuration of an entry point.
type HTTP2Config struct {
MaxConcurrentStreams int32 `description:"Specifies the number of concurrent streams per connection that each client is allowed to initiate." json:"maxConcurrentStreams,omitempty" toml:"maxConcurrentStreams,omitempty" yaml:"maxConcurrentStreams,omitempty" export:"true"`

2
pkg/server/aggregator.go
View file

@ -215,7 +215,7 @@ func applyModel(cfg dynamic.Configuration) dynamic.Configuration {
if m.DeniedEncodedPathCharacters != nil {
// As the denied encoded path characters option is not configurable at the router level,
// we can simply copy the whole structure to override the router's default config.
cp.DeniedEncodedPathCharacters = *m.DeniedEncodedPathCharacters
cp.DeniedEncodedPathCharacters = m.DeniedEncodedPathCharacters
}
if cp.Observability == nil {

19
pkg/server/router/deny.go
View file

@ -2,29 +2,10 @@ package router
import (
"net/http"
"strings"
"github.com/rs/zerolog/log"
)
// denyFragment rejects the request if the URL path contains a fragment (hash character).
// When go receives an HTTP request, it assumes the absence of fragment URL.
// However, it is still possible to send a fragment in the request.
// In this case, Traefik will encode the '#' character, altering the request's intended meaning.
// To avoid this behavior, the following function rejects requests that include a fragment in the URL.
func denyFragment(h http.Handler) http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
if strings.Contains(req.URL.RawPath, "#") {
log.Debug().Msgf("Rejecting request because it contains a fragment in the URL path: %s", req.URL.RawPath)
rw.WriteHeader(http.StatusBadRequest)
return
}
h.ServeHTTP(rw, req)
})
}
// denyEncodedPathCharacters reject the request if the escaped path contains encoded characters in the given list.
func denyEncodedPathCharacters(encodedCharacters map[string]struct{}, h http.Handler) http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {

36
pkg/server/router/deny_test.go
View file

@ -8,42 +8,6 @@ import (
"github.com/stretchr/testify/assert"
)
func Test_denyFragment(t *testing.T) {
tests := []struct {
name string
url string
wantStatus int
}{
{
name: "Rejects fragment character",
url: "http://example.com/#",
wantStatus: http.StatusBadRequest,
},
{
name: "Allows without fragment",
url: "http://example.com/",
wantStatus: http.StatusOK,
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
t.Parallel()
handler := denyFragment(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
}))
req := httptest.NewRequest(http.MethodGet, test.url, nil)
res := httptest.NewRecorder()
handler.ServeHTTP(res, req)
assert.Equal(t, test.wantStatus, res.Code)
})
}
}
func Test_denyEncodedPathCharacters(t *testing.T) {
tests := []struct {
name string

5
pkg/server/router/router.go
View file

@ -274,10 +274,7 @@ func (m *Manager) buildHTTPHandler(ctx context.Context, router *runtime.RouterIn
// Here we are adding deny handlers for encoded path characters and fragment.
// Deny handler are only added for root routers, child routers are protected by their parent router deny handlers.
if len(router.ParentRefs) == 0 {
chain = chain.Append(func(next http.Handler) (http.Handler, error) {
return denyFragment(next), nil
})
if len(router.ParentRefs) == 0 && router.DeniedEncodedPathCharacters != nil {
chain = chain.Append(func(next http.Handler) (http.Handler, error) {
return denyEncodedPathCharacters(router.DeniedEncodedPathCharacters.Map(), next), nil
})

60
pkg/server/router/router_test.go
View file

@ -1837,7 +1837,7 @@ func TestManager_BuildHandlers_Deny(t *testing.T) {
},
},
},
expectedStatusCode: http.StatusBadRequest,
expectedStatusCode: http.StatusOK,
},
{
desc: "parent router with child routers, request with encoded slash",
@ -1860,18 +1860,18 @@ func TestManager_BuildHandlers_Deny(t *testing.T) {
},
},
},
expectedStatusCode: http.StatusBadRequest,
expectedStatusCode: http.StatusOK,
},
{
desc: "parent router allowing encoded slash without child router",
desc: "parent router disallowing encoded slash without child router",
requestPath: "/foo%2F",
routers: map[string]*dynamic.Router{
"parent": {
EntryPoints: []string{"web"},
Rule: "PathPrefix(`/`)",
Service: "service",
DeniedEncodedPathCharacters: dynamic.RouterDeniedEncodedPathCharacters{
AllowEncodedSlash: true,
DeniedEncodedPathCharacters: &dynamic.RouterDeniedEncodedPathCharacters{
AllowEncodedSlash: false,
},
},
},
@ -1882,17 +1882,17 @@ func TestManager_BuildHandlers_Deny(t *testing.T) {
},
},
},
expectedStatusCode: http.StatusOK,
expectedStatusCode: http.StatusBadRequest,
},
{
desc: "parent router allowing encoded slash with child routers",
desc: "parent router disallowing encoded slash with child routers",
requestPath: "/foo%2F",
routers: map[string]*dynamic.Router{
"parent": {
EntryPoints: []string{"web"},
Rule: "PathPrefix(`/`)",
DeniedEncodedPathCharacters: dynamic.RouterDeniedEncodedPathCharacters{
AllowEncodedSlash: true,
DeniedEncodedPathCharacters: &dynamic.RouterDeniedEncodedPathCharacters{
AllowEncodedSlash: false,
},
},
"child1": {
@ -1908,48 +1908,6 @@ func TestManager_BuildHandlers_Deny(t *testing.T) {
},
},
},
expectedStatusCode: http.StatusOK,
},
{
desc: "parent router without child routers, request with fragment",
requestPath: "/foo#",
routers: map[string]*dynamic.Router{
"parent": {
EntryPoints: []string{"web"},
Rule: "PathPrefix(`/`)",
Service: "service",
},
},
services: map[string]*dynamic.Service{
"service": {
LoadBalancer: &dynamic.ServersLoadBalancer{
Servers: []dynamic.Server{{URL: "http://localhost:8080"}},
},
},
},
expectedStatusCode: http.StatusBadRequest,
},
{
desc: "parent router with child routers, request with fragment",
requestPath: "/foo#",
routers: map[string]*dynamic.Router{
"parent": {
EntryPoints: []string{"web"},
Rule: "PathPrefix(`/`)",
},
"child1": {
Rule: "Path(`/v1`)",
Service: "child1-service",
ParentRefs: []string{"parent"},
},
},
services: map[string]*dynamic.Service{
"child1-service": {
LoadBalancer: &dynamic.ServersLoadBalancer{
Servers: []dynamic.Server{{URL: "http://localhost:8080"}},
},
},
},
expectedStatusCode: http.StatusBadRequest,
},
}

20
pkg/server/server_entrypoint_tcp.go
View file

@ -683,6 +683,8 @@ func newHTTPServer(ctx context.Context, ln net.Listener, configuration *static.E
handler = normalizePath(handler)
handler = denyFragment(handler)
serverHTTP := &http.Server{
Protocols: &protocols,
Handler: handler,
@ -765,6 +767,24 @@ func (t *trackedConnection) Close() error {
return t.WriteCloser.Close()
}
// denyFragment rejects the request if the URL path contains a fragment (hash character).
// When go receives an HTTP request, it assumes the absence of fragment URL.
// However, it is still possible to send a fragment in the request.
// In this case, Traefik will encode the '#' character, altering the request's intended meaning.
// To avoid this behavior, the following function rejects requests that include a fragment in the URL.
func denyFragment(h http.Handler) http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
if strings.Contains(req.URL.RawPath, "#") {
log.Debug().Msgf("Rejecting request because it contains a fragment in the URL path: %s", req.URL.RawPath)
rw.WriteHeader(http.StatusBadRequest)
return
}
h.ServeHTTP(rw, req)
})
}
// This function is inspired by http.AllowQuerySemicolons.
func encodeQuerySemicolons(h http.Handler) http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {

36
pkg/server/server_entrypoint_tcp_test.go
View file

@ -387,6 +387,42 @@ func TestKeepAliveH2c(t *testing.T) {
require.Contains(t, err.Error(), "use of closed network connection")
}
func Test_denyFragment(t *testing.T) {
tests := []struct {
name string
url string
wantStatus int
}{
{
name: "Rejects fragment character",
url: "http://example.com/#",
wantStatus: http.StatusBadRequest,
},
{
name: "Allows without fragment",
url: "http://example.com/",
wantStatus: http.StatusOK,
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
t.Parallel()
handler := denyFragment(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
}))
req := httptest.NewRequest(http.MethodGet, test.url, nil)
res := httptest.NewRecorder()
handler.ServeHTTP(res, req)
assert.Equal(t, test.wantStatus, res.Code)
})
}
}
func TestSanitizePath(t *testing.T) {
tests := []struct {
path string