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traefik/docs/content/middlewares/http/passtlsclientcert.md
Ludovic Fernandez 466d7461b7
Split Docker provider
2023-05-10 15:28:05 +02:00

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---
title: "Traefik PassTLSClientCert Documentation"
description: "In Traefik Proxy's HTTP middleware, the PassTLSClientCert adds selected data from passed client TLS certificates to headers. Read the technical documentation."
---
# PassTLSClientCert
Adding Client Certificates in a Header
{: .subtitle }
<!--
TODO: add schema
-->
PassTLSClientCert adds the selected data from the passed client TLS certificate to a header.
## Configuration Examples
Pass the pem in the `X-Forwarded-Tls-Client-Cert` header.
```yaml tab="Docker & Swarm"
# Pass the pem in the `X-Forwarded-Tls-Client-Cert` header.
labels:
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.pem=true"
```
```yaml tab="Kubernetes"
apiVersion: traefik.io/v1alpha1
kind: Middleware
metadata:
name: test-passtlsclientcert
spec:
passTLSClientCert:
pem: true
```
```yaml tab="Consul Catalog"
# Pass the pem in the `X-Forwarded-Tls-Client-Cert` header
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.pem=true"
```
```yaml tab="File (YAML)"
# Pass the pem in the `X-Forwarded-Tls-Client-Cert` header.
http:
middlewares:
test-passtlsclientcert:
passTLSClientCert:
pem: true
```
```toml tab="File (TOML)"
# Pass the pem in the `X-Forwarded-Tls-Client-Cert` header.
[http.middlewares]
[http.middlewares.test-passtlsclientcert.passTLSClientCert]
pem = true
```
??? example "Pass the pem in the `X-Forwarded-Tls-Client-Cert` header"
```yaml tab="Docker & Swarm"
# Pass all the available info in the `X-Forwarded-Tls-Client-Cert-Info` header
labels:
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.notafter=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.notbefore=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.sans=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.serialnumber=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.subject.commonname=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.subject.country=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.subject.domaincomponent=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.subject.locality=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.subject.organization=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.subject.organizationalunit=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.subject.province=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.subject.serialnumber=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.issuer.commonname=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.issuer.country=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.issuer.domaincomponent=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.issuer.locality=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.issuer.organization=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.issuer.province=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.issuer.serialnumber=true"
```
```yaml tab="Kubernetes"
# Pass all the available info in the `X-Forwarded-Tls-Client-Cert-Info` header
apiVersion: traefik.io/v1alpha1
kind: Middleware
metadata:
name: test-passtlsclientcert
spec:
passTLSClientCert:
info:
notAfter: true
notBefore: true
sans: true
subject:
country: true
province: true
locality: true
organization: true
organizationalUnit: true
commonName: true
serialNumber: true
domainComponent: true
issuer:
country: true
province: true
locality: true
organization: true
commonName: true
serialNumber: true
domainComponent: true
```
```yaml tab="Consul Catalog"
# Pass all the available info in the `X-Forwarded-Tls-Client-Cert-Info` header
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.notafter=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.notbefore=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.sans=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.subject.commonname=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.subject.country=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.subject.domaincomponent=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.subject.locality=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.subject.organization=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.subject.organizationalunit=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.subject.province=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.subject.serialnumber=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.issuer.commonname=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.issuer.country=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.issuer.domaincomponent=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.issuer.locality=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.issuer.organization=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.issuer.province=true"
- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.issuer.serialnumber=true"
```
```yaml tab="File (YAML)"
# Pass all the available info in the `X-Forwarded-Tls-Client-Cert-Info` header
http:
middlewares:
test-passtlsclientcert:
passTLSClientCert:
info:
notAfter: true
notBefore: true
sans: true
subject:
country: true
province: true
locality: true
organization: true
organizationalUnit: true
commonName: true
serialNumber: true
domainComponent: true
issuer:
country: true
province: true
locality: true
organization: true
commonName: true
serialNumber: true
domainComponent: true
```
```toml tab="File (TOML)"
# Pass all the available info in the `X-Forwarded-Tls-Client-Cert-Info` header
[http.middlewares]
[http.middlewares.test-passtlsclientcert.passTLSClientCert]
[http.middlewares.test-passtlsclientcert.passTLSClientCert.info]
notAfter = true
notBefore = true
sans = true
[http.middlewares.test-passtlsclientcert.passTLSClientCert.info.subject]
country = true
province = true
locality = true
organization = true
organizationalUnit = true
commonName = true
serialNumber = true
domainComponent = true
[http.middlewares.test-passtlsclientcert.passTLSClientCert.info.issuer]
country = true
province = true
locality = true
organization = true
commonName = true
serialNumber = true
domainComponent = true
```
## Configuration Options
### General
PassTLSClientCert can add two headers to the request:
- `X-Forwarded-Tls-Client-Cert` that contains the pem.
- `X-Forwarded-Tls-Client-Cert-Info` that contains all the selected certificate information in an escaped string.
!!! info
* `X-Forwarded-Tls-Client-Cert-Info` header value is a string that has been escaped in order to be a valid URL query.
* These options only work accordingly to the [MutualTLS configuration](../../https/tls.md#client-authentication-mtls).
That is to say, only the certificates that match the `clientAuth.clientAuthType` policy are passed.
The following example shows a complete certificate and explains each of the middleware options.
??? example "A complete client TLS certificate"
```
Certificate:
Data:
Version: 3 (0x2)
Serial Number: 1 (0x1)
Signature Algorithm: sha1WithRSAEncryption
Issuer: DC=org, DC=cheese, O=Cheese, O=Cheese 2, OU=Simple Signing Section, OU=Simple Signing Section 2, CN=Simple Signing CA, CN=Simple Signing CA 2, C=FR, C=US, L=TOULOUSE, L=LYON, ST=Signing State, ST=Signing State 2/emailAddress=simple@signing.com/emailAddress=simple2@signing.com
Validity
Not Before: Dec 6 11:10:16 2018 GMT
Not After : Dec 5 11:10:16 2020 GMT
Subject: DC=org, DC=cheese, O=Cheese, O=Cheese 2, OU=Simple Signing Section, OU=Simple Signing Section 2, CN=*.example.org, CN=*.example.com, C=FR, C=US, L=TOULOUSE, L=LYON, ST=Cheese org state, ST=Cheese com state/emailAddress=cert@example.org/emailAddress=cert@sexample.com
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
RSA Public-Key: (2048 bit)
Modulus:
00:de:77:fa:8d:03:70:30:39:dd:51:1b:cc:60:db:
a9:5a:13:b1:af:fe:2c:c6:38:9b:88:0a:0f:8e:d9:
1b:a1:1d:af:0d:66:e4:13:5b:bc:5d:36:92:d7:5e:
d0:fa:88:29:d3:78:e1:81:de:98:b2:a9:22:3f:bf:
8a:af:12:92:63:d4:a9:c3:f2:e4:7e:d2:dc:a2:c5:
39:1c:7a:eb:d7:12:70:63:2e:41:47:e0:f0:08:e8:
dc:be:09:01:ec:28:09:af:35:d7:79:9c:50:35:d1:
6b:e5:87:7b:34:f6:d2:31:65:1d:18:42:69:6c:04:
11:83:fe:44:ae:90:92:2d:0b:75:39:57:62:e6:17:
2f:47:2b:c7:53:dd:10:2d:c9:e3:06:13:d2:b9:ba:
63:2e:3c:7d:83:6b:d6:89:c9:cc:9d:4d:bf:9f:e8:
a3:7b:da:c8:99:2b:ba:66:d6:8e:f8:41:41:a0:c9:
d0:5e:c8:11:a4:55:4a:93:83:87:63:04:63:41:9c:
fb:68:04:67:c2:71:2f:f2:65:1d:02:5d:15:db:2c:
d9:04:69:85:c2:7d:0d:ea:3b:ac:85:f8:d4:8f:0f:
c5:70:b2:45:e1:ec:b2:54:0b:e9:f7:82:b4:9b:1b:
2d:b9:25:d4:ab:ca:8f:5b:44:3e:15:dd:b8:7f:b7:
ee:f9
Exponent: 65537 (0x10001)
X509v3 extensions:
X509v3 Key Usage: critical
Digital Signature, Key Encipherment
X509v3 Basic Constraints:
CA:FALSE
X509v3 Extended Key Usage:
TLS Web Server Authentication, TLS Web Client Authentication
X509v3 Subject Key Identifier:
94:BA:73:78:A2:87:FB:58:28:28:CF:98:3B:C2:45:70:16:6E:29:2F
X509v3 Authority Key Identifier:
keyid:1E:52:A2:E8:54:D5:37:EB:D5:A8:1D:E4:C2:04:1D:37:E2:F7:70:03
X509v3 Subject Alternative Name:
DNS:*.example.org, DNS:*.example.net, DNS:*.example.com, IP Address:10.0.1.0, IP Address:10.0.1.2, email:test@example.org, email:test@example.net
Signature Algorithm: sha1WithRSAEncryption
76:6b:05:b0:0e:34:11:b1:83:99:91:dc:ae:1b:e2:08:15:8b:
16:b2:9b:27:1c:02:ac:b5:df:1b:d0:d0:75:a4:2b:2c:5c:65:
ed:99:ab:f7:cd:fe:38:3f:c3:9a:22:31:1b:ac:8c:1c:c2:f9:
5d:d4:75:7a:2e:72:c7:85:a9:04:af:9f:2a:cc:d3:96:75:f0:
8e:c7:c6:76:48:ac:45:a4:b9:02:1e:2f:c0:15:c4:07:08:92:
cb:27:50:67:a1:c8:05:c5:3a:b3:a6:48:be:eb:d5:59:ab:a2:
1b:95:30:71:13:5b:0a:9a:73:3b:60:cc:10:d0:6a:c7:e5:d7:
8b:2f:f9:2e:98:f2:ff:81:14:24:09:e3:4b:55:57:09:1a:22:
74:f1:f6:40:13:31:43:89:71:0a:96:1a:05:82:1f:83:3a:87:
9b:17:25:ef:5a:55:f2:2d:cd:0d:4d:e4:81:58:b6:e3:8d:09:
62:9a:0c:bd:e4:e5:5c:f0:95:da:cb:c7:34:2c:34:5f:6d:fc:
60:7b:12:5b:86:fd:df:21:89:3b:48:08:30:bf:67:ff:8c:e6:
9b:53:cc:87:36:47:70:40:3b:d9:90:2a:d2:d2:82:c6:9c:f5:
d1:d8:e0:e6:fd:aa:2f:95:7e:39:ac:fc:4e:d4:ce:65:b3:ec:
c6:98:8a:31
-----BEGIN CERTIFICATE-----
MIIGWjCCBUKgAwIBAgIBATANBgkqhkiG9w0BAQUFADCCAYQxEzARBgoJkiaJk/Is
ZAEZFgNvcmcxFjAUBgoJkiaJk/IsZAEZFgZjaGVlc2UxDzANBgNVBAoMBkNoZWVz
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-----END CERTIFICATE-----
```
### `pem`
The `pem` option sets the `X-Forwarded-Tls-Client-Cert` header with the certificate.
In the example, it is the part between `-----BEGIN CERTIFICATE-----` and `-----END CERTIFICATE-----` delimiters:
??? example "The data used by the pem option"
```
-----BEGIN CERTIFICATE-----
MIIGWjCCBUKgAwIBAgIBATANBgkqhkiG9w0BAQUFADCCAYQxEzARBgoJkiaJk/Is
ZAEZFgNvcmcxFjAUBgoJkiaJk/IsZAEZFgZjaGVlc2UxDzANBgNVBAoMBkNoZWVz
ZTERMA8GA1UECgwIQ2hlZXNlIDIxHzAdBgNVBAsMFlNpbXBsZSBTaWduaW5nIFNl
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KszTlnXwjsfGdkisRaS5Ah4vwBXEBwiSyydQZ6HIBcU6s6ZIvuvVWauiG5UwcRNb
CppzO2DMENBqx+XXiy/5Lpjy/4EUJAnjS1VXCRoidPH2QBMxQ4lxCpYaBYIfgzqH
mxcl71pV8i3NDU3kgVi2440JYpoMveTlXPCV2svHNCw0X238YHsSW4b93yGJO0gI
ML9n/4zmm1PMhzZHcEA72ZAq0tKCxpz10djg5v2qL5V+Oaz8TtTOZbPsxpiKMQ==
-----END CERTIFICATE-----
```
!!! info "Extracted data"
The delimiters and `\n` will be removed.
If there are more than one certificate, they are separated by a "`,`".
!!! warning "`X-Forwarded-Tls-Client-Cert` value could exceed the web server header size limit"
The header size limit of web servers is commonly between 4kb and 8kb.
If that turns out to be a problem, and if reconfiguring the server to allow larger headers is not an option,
one can alleviate the problem by selecting only the interesting parts of the cert,
through the use of the `info` options described below. (And by setting `pem` to false).
### `info`
The `info` option selects the specific client certificate details you want to add to the `X-Forwarded-Tls-Client-Cert-Info` header.
The value of the header is an escaped concatenation of all the selected certificate details.
But in the following, unless specified otherwise, all the header values examples are shown unescaped, for readability.
The following example shows such a concatenation, when all the available fields are selected:
```text
Subject="DC=org,DC=cheese,C=FR,C=US,ST=Cheese org state,ST=Cheese com state,L=TOULOUSE,L=LYON,O=Cheese,O=Cheese 2,CN=*.example.com";Issuer="DC=org,DC=cheese,C=FR,C=US,ST=Signing State,ST=Signing State 2,L=TOULOUSE,L=LYON,O=Cheese,O=Cheese 2,CN=Simple Signing CA 2";NB="1544094616";NA="1607166616";SAN="*.example.org,*.example.net,*.example.com,test@example.org,test@example.net,10.0.1.0,10.0.1.2"
```
!!! info "Multiple certificates"
If there are more than one certificate, they are separated by a `,`.
#### `info.serialNumber`
Set the `info.serialNumber` option to `true` to add the `Serial Number` of the certificate.
The data is taken from the following certificate part:
```text
Serial Number:
6a:2f:20:f8:ce:8d:48:52:ba:d9:bb:be:60:ec:bf:79
```
And it is formatted as follows in the header (decimal representation):
```text
SerialNumber="141142874255168551917600297745052909433"
```
#### `info.notAfter`
Set the `info.notAfter` option to `true` to add the `Not After` information from the `Validity` part.
The data is taken from the following certificate part:
```text
Validity
Not After : Dec 5 11:10:16 2020 GMT
```
And it is formatted as follows in the header:
```text
NA="1607166616"
```
#### `info.notBefore`
Set the `info.notBefore` option to `true` to add the `Not Before` information from the `Validity` part.
The data is taken from the following certificate part:
```text
Validity
Not Before: Dec 6 11:10:16 2018 GMT
```
And it is formatted as follows in the header:
```text
NB="1544094616"
```
#### `info.sans`
Set the `info.sans` option to `true` to add the `Subject Alternative Name` information from the `Subject Alternative Name` part.
The data is taken from the following certificate part:
```text
X509v3 Subject Alternative Name:
DNS:*.example.org, DNS:*.example.net, DNS:*.example.com, IP Address:10.0.1.0, IP Address:10.0.1.2, email:test@example.org, email:test@example.net
```
And it is formatted as follows in the header:
```text
SAN="*.example.org,*.example.net,*.example.com,test@example.org,test@example.net,10.0.1.0,10.0.1.2"
```
!!! info "Multiple values"
The SANs are separated by a `,`.
#### `info.subject`
The `info.subject` selects the specific client certificate subject details you want to add to the `X-Forwarded-Tls-Client-Cert-Info` header.
The data is taken from the following certificate part:
```text
Subject: DC=org, DC=cheese, O=Cheese, O=Cheese 2, OU=Simple Signing Section, OU=Simple Signing Section 2, CN=*.example.org, CN=*.example.com, C=FR, C=US, L=TOULOUSE, L=LYON, ST=Cheese org state, ST=Cheese com state/emailAddress=cert@example.org/emailAddress=cert@sexample.com
```
##### `info.subject.country`
Set the `info.subject.country` option to `true` to add the `country` information into the subject.
The data is taken from the subject part with the `C` key.
And it is formatted as follows in the header:
```text
C=FR,C=US
```
##### `info.subject.province`
Set the `info.subject.province` option to `true` to add the `province` information into the subject.
The data is taken from the subject part with the `ST` key.
And it is formatted as follows in the header:
```text
ST=Cheese org state,ST=Cheese com state
```
##### `info.subject.locality`
Set the `info.subject.locality` option to `true` to add the `locality` information into the subject.
The data is taken from the subject part with the `L` key.
And it is formatted as follows in the header:
```text
L=TOULOUSE,L=LYON
```
##### `info.subject.organization`
Set the `info.subject.organization` option to `true` to add the `organization` information into the subject.
The data is taken from the subject part with the `O` key.
And it is formatted as follows in the header:
```text
O=Cheese,O=Cheese 2
```
##### `info.subject.organizationalUnit`
Set the `info.subject.organizationalUnit` option to `true` to add the `organizationalUnit` information into the subject.
The data is taken from the subject part with the `OU` key.
And it is formatted as follows in the header:
```text
OU=Cheese Section,OU=Cheese Section 2
```
##### `info.subject.commonName`
Set the `info.subject.commonName` option to `true` to add the `commonName` information into the subject.
The data is taken from the subject part with the `CN` key.
And it is formatted as follows in the header:
```text
CN=*.example.com
```
##### `info.subject.serialNumber`
Set the `info.subject.serialNumber` option to `true` to add the `serialNumber` information into the subject.
The data is taken from the subject part with the `SN` key.
And it is formatted as follows in the header:
```text
SN=1234567890
```
##### `info.subject.domainComponent`
Set the `info.subject.domainComponent` option to `true` to add the `domainComponent` information into the subject.
The data is taken from the subject part with the `DC` key.
And it is formatted as follows in the header:
```text
DC=org,DC=cheese
```
#### `info.issuer`
The `info.issuer` selects the specific client certificate issuer details you want to add to the `X-Forwarded-Tls-Client-Cert-Info` header.
The data is taken from the following certificate part:
```text
Issuer: DC=org, DC=cheese, O=Cheese, O=Cheese 2, OU=Simple Signing Section, OU=Simple Signing Section 2, CN=Simple Signing CA, CN=Simple Signing CA 2, C=FR, C=US, L=TOULOUSE, L=LYON, ST=Signing State, ST=Signing State 2/emailAddress=simple@signing.com/emailAddress=simple2@signing.com
```
##### `info.issuer.country`
Set the `info.issuer.country` option to `true` to add the `country` information into the issuer.
The data is taken from the issuer part with the `C` key.
And it is formatted as follows in the header:
```text
C=FR,C=US
```
##### `info.issuer.province`
Set the `info.issuer.province` option to `true` to add the `province` information into the issuer.
The data is taken from the issuer part with the `ST` key.
And it is formatted as follows in the header:
```text
ST=Signing State,ST=Signing State 2
```
##### `info.issuer.locality`
Set the `info.issuer.locality` option to `true` to add the `locality` information into the issuer.
The data is taken from the issuer part with the `L` key.
And it is formatted as follows in the header:
```text
L=TOULOUSE,L=LYON
```
##### `info.issuer.organization`
Set the `info.issuer.organization` option to `true` to add the `organization` information into the issuer.
The data is taken from the issuer part with the `O` key.
And it is formatted as follows in the header:
```text
O=Cheese,O=Cheese 2
```
##### `info.issuer.commonName`
Set the `info.issuer.commonName` option to `true` to add the `commonName` information into the issuer.
The data is taken from the issuer part with the `CN` key.
And it is formatted as follows in the header:
```text
CN=Simple Signing CA 2
```
##### `info.issuer.serialNumber`
Set the `info.issuer.serialNumber` option to `true` to add the `serialNumber` information into the issuer.
The data is taken from the issuer part with the `SN` key.
And it is formatted as follows in the header:
```text
SN=1234567890
```
##### `info.issuer.domainComponent`
Set the `info.issuer.domainComponent` option to `true` to add the `domainComponent` information into the issuer.
The data is taken from the issuer part with the `DC` key.
And it is formatted as follows in the header:
```text
DC=org,DC=cheese
```
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