New Routing Reference Documentation
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---
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title: "Traefik TLS Options Documentation"
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description: "Learn how to configure the transport layer security (TLS) connection in Traefik Proxy. Read the technical documentation."
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---
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The TLS options allow one to configure some parameters of the TLS connection.
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!!! important "'default' TLS Option"
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The `default` option is special.
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When no tls options are specified in a tls router, the `default` option is used.
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When specifying the `default` option explicitly, make sure not to specify provider namespace as the `default` option does not have one.
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Conversely, for cross-provider references, for example, when referencing the file provider from a docker label,
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you must specify the provider namespace, for example:
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`traefik.http.routers.myrouter.tls.options=myoptions@file`
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!!! important "Providers"
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TLS options are not supported by label or tag-based providers. However, you can define them when using a [KV provider](../../other-providers/kv.md).
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### Minimum TLS Version
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```yaml tab="Structured (YAML)"
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# Dynamic configuration
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tls:
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options:
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default:
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minVersion: VersionTLS12
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mintls13:
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minVersion: VersionTLS13
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```
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```toml tab="Structured (TOML)"
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# Dynamic configuration
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[tls.options]
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[tls.options.default]
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minVersion = "VersionTLS12"
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[tls.options.mintls13]
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minVersion = "VersionTLS13"
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```
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### Maximum TLS Version
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We discourage the use of this setting to disable TLS1.3.
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The recommended approach is to update the clients to support TLS1.3.
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```yaml tab="Structured (YAML)"
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# Dynamic configuration
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tls:
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options:
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default:
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maxVersion: VersionTLS13
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maxtls12:
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maxVersion: VersionTLS12
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```
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```toml tab="Structured (TOML)"
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# Dynamic configuration
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[tls.options]
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[tls.options.default]
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maxVersion = "VersionTLS13"
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[tls.options.maxtls12]
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maxVersion = "VersionTLS12"
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```
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### Cipher Suites
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See [cipherSuites](https://godoc.org/crypto/tls#pkg-constants) for more information.
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```yaml tab="Structured (YAML)"
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# Dynamic configuration
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tls:
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options:
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default:
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cipherSuites:
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- TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
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```
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```toml tab="Structured (TOML)"
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# Dynamic configuration
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[tls.options]
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[tls.options.default]
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cipherSuites = [
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"TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256"
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]
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```
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!!! important "TLS 1.3"
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Cipher suites defined for TLS 1.2 and below cannot be used in TLS 1.3, and vice versa. (<https://tools.ietf.org/html/rfc8446>)
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With TLS 1.3, the cipher suites are not configurable (all supported cipher suites are safe in this case).
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<https://golang.org/doc/go1.12#tls_1_3>
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### Curve Preferences
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This option allows to set the preferred elliptic curves in a specific order.
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The names of the curves defined by [`crypto`](https://godoc.org/crypto/tls#CurveID) (e.g. `CurveP521`) and the [RFC defined names](https://tools.ietf.org/html/rfc8446#section-4.2.7) (e. g. `secp521r1`) can be used.
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See [CurveID](https://godoc.org/crypto/tls#CurveID) for more information.
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```yaml tab="Structured (YAML)"
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# Dynamic configuration
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tls:
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options:
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default:
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curvePreferences:
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- CurveP521
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- CurveP384
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```
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```toml tab="Structured (TOML)"
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# Dynamic configuration
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[tls.options]
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[tls.options.default]
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curvePreferences = ["CurveP521", "CurveP384"]
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```
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### Strict SNI Checking
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With strict SNI checking enabled, Traefik won't allow connections from clients that do not specify a server_name extension
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or don't match any of the configured certificates.
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The default certificate is irrelevant on that matter.
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```yaml tab="Structured (YAML)"
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# Dynamic configuration
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tls:
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options:
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default:
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sniStrict: true
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```
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```toml tab="Structured (TOML)"
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# Dynamic configuration
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[tls.options]
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[tls.options.default]
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sniStrict = true
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```
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### ALPN Protocols
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_Optional, Default="h2, http/1.1, acme-tls/1"_
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This option allows to specify the list of supported application level protocols for the TLS handshake,
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in order of preference.
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If the client supports ALPN, the selected protocol will be one from this list,
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and the connection will fail if there is no mutually supported protocol.
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```yaml tab="Structured (YAML)"
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# Dynamic configuration
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tls:
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options:
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default:
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alpnProtocols:
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- http/1.1
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- h2
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```
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```toml tab="Structured (TOML)"
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# Dynamic configuration
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[tls.options]
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[tls.options.default]
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alpnProtocols = ["http/1.1", "h2"]
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```
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### Client Authentication (mTLS)
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Traefik supports mutual authentication, through the `clientAuth` section.
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For authentication policies that require verification of the client certificate, the certificate authority for the certificates should be set in `clientAuth.caFiles`.
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In Kubernetes environment, CA certificate can be set in `clientAuth.secretNames`. See [TLSOption resource](../../kubernetes/crd/http/tlsoption.md) for more details.
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The `clientAuth.clientAuthType` option governs the behaviour as follows:
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| Option | Operation |
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| --------- | ----------- |
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| `NoClientCert` | Disregards any client certificate.|
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| `RequestClientCert` | Asks for a certificate but proceeds anyway if none is provided. |
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| `RequireAnyClientCert` | Requires a certificate but does not verify if it is signed by a CA listed in `clientAuth.caFiles` or in `clientAuth.secretNames`. |
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| `VerifyClientCertIfGiven` | If a certificate is provided, verifies if it is signed by a CA listed in `clientAuth.caFiles` or in `clientAuth.secretNames`. Otherwise proceeds without any certificate. |
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| `RequireAndVerifyClientCert` | requires a certificate, which must be signed by a CA listed in `clientAuth.caFiles` or in `clientAuth.secretNames`. |
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```yaml tab="Structured (YAML)"
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# Dynamic configuration
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tls:
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options:
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default:
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clientAuth:
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# in PEM format. each file can contain multiple CAs.
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caFiles:
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- tests/clientca1.crt
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- tests/clientca2.crt
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clientAuthType: RequireAndVerifyClientCert
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```
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```toml tab="Structured (TOML)"
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# Dynamic configuration
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[tls.options]
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[tls.options.default]
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[tls.options.default.clientAuth]
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# in PEM format. each file can contain multiple CAs.
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caFiles = ["tests/clientca1.crt", "tests/clientca2.crt"]
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clientAuthType = "RequireAndVerifyClientCert"
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```
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{!traefik-for-business-applications.md!}
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