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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."
---
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# PassTLSClientCert
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Adding Client Certificates in a Header
{: .subtitle }
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<!--
TODO: add schema
-->
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PassTLSClientCert adds the selected data from the passed client TLS certificate to a header.
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## Configuration Examples
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Pass the pem in the `X-Forwarded-Tls-Client-Cert` header.
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```yaml tab="Docker"
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# Pass the pem in the `X-Forwarded-Tls-Client-Cert` header.
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labels:
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- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.pem=true"
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```
```yaml tab="Kubernetes"
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apiVersion: traefik.io/v1alpha1
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kind: Middleware
metadata:
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name: test-passtlsclientcert
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spec:
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passTLSClientCert:
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pem: true
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```
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```yaml tab="Consul Catalog"
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# Pass the pem in the `X-Forwarded-Tls-Client-Cert` header
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- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.pem=true"
```
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```yaml tab="File (YAML)"
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# Pass the pem in the `X-Forwarded-Tls-Client-Cert` header.
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http:
middlewares:
test-passtlsclientcert:
passTLSClientCert:
pem: true
```
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```toml tab="File (TOML)"
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# Pass the pem in the `X-Forwarded-Tls-Client-Cert` header.
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[http.middlewares]
[http.middlewares.test-passtlsclientcert.passTLSClientCert]
pem = true
```
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??? example "Pass the pem in the `X-Forwarded-Tls-Client-Cert` header"
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```yaml tab="Docker"
# Pass all the available info in the `X-Forwarded-Tls-Client-Cert-Info` header
labels:
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- "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"
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- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.serialnumber=true"
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- "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"
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- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.subject.organizationalunit=true"
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- "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"
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```
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```yaml tab="Kubernetes"
# Pass all the available info in the `X-Forwarded-Tls-Client-Cert-Info` header
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apiVersion: traefik.io/v1alpha1
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kind: Middleware
metadata:
name: test-passtlsclientcert
spec:
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passTLSClientCert:
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info:
notAfter: true
notBefore: true
sans: true
subject:
country: true
province: true
locality: true
organization: true
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organizationalUnit: true
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commonName: true
serialNumber: true
domainComponent: true
issuer:
country: true
province: true
locality: true
organization: true
commonName: true
serialNumber: true
domainComponent: true
```
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```yaml tab="Consul Catalog"
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# Pass all the available info in the `X-Forwarded-Tls-Client-Cert-Info` header
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- "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"
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- "traefik.http.middlewares.test-passtlsclientcert.passtlsclientcert.info.subject.organizationalunit=true"
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- "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"
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```
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```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
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organizationalUnit: true
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commonName: true
serialNumber: true
domainComponent: true
issuer:
country: true
province: true
locality: true
organization: true
commonName: true
serialNumber: true
domainComponent: true
```
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```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
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organizationalUnit = true
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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
```
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## Configuration Options
### General
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PassTLSClientCert can add two headers to the request:
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- `X-Forwarded-Tls-Client-Cert` that contains the pem.
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- `X-Forwarded-Tls-Client-Cert-Info` that contains all the selected certificate information in an escaped string.
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!!! info
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* `X-Forwarded-Tls-Client-Cert-Info` header value is a string that has been escaped in order to be a valid URL query.
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* These options only work accordingly to the [MutualTLS configuration ](../../https/tls.md#client-authentication-mtls ).
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That is to say, only the certificates that match the `clientAuth.clientAuthType` policy are passed.
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The following example shows a complete certificate and explains each of the middleware options.
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??? example "A complete client TLS certificate"
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```
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
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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
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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
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X509v3 Basic Constraints:
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CA:FALSE
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X509v3 Extended Key Usage:
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TLS Web Server Authentication, TLS Web Client Authentication
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X509v3 Subject Key Identifier:
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94:BA:73:78:A2:87:FB:58:28:28:CF:98:3B:C2:45:70:16:6E:29:2F
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X509v3 Authority Key Identifier:
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keyid:1E:52:A2:E8:54:D5:37:EB:D5:A8:1D:E4:C2:04:1D:37:E2:F7:70:03
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X509v3 Subject Alternative Name:
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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
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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
ZTERMA8GA1UECgwIQ2hlZXNlIDIxHzAdBgNVBAsMFlNpbXBsZSBTaWduaW5nIFNl
Y3Rpb24xITAfBgNVBAsMGFNpbXBsZSBTaWduaW5nIFNlY3Rpb24gMjEaMBgGA1UE
AwwRU2ltcGxlIFNpZ25pbmcgQ0ExHDAaBgNVBAMME1NpbXBsZSBTaWduaW5nIENB
IDIxCzAJBgNVBAYTAkZSMQswCQYDVQQGEwJVUzERMA8GA1UEBwwIVE9VTE9VU0Ux
DTALBgNVBAcMBExZT04xFjAUBgNVBAgMDVNpZ25pbmcgU3RhdGUxGDAWBgNVBAgM
D1NpZ25pbmcgU3RhdGUgMjEhMB8GCSqGSIb3DQEJARYSc2ltcGxlQHNpZ25pbmcu
Y29tMSIwIAYJKoZIhvcNAQkBFhNzaW1wbGUyQHNpZ25pbmcuY29tMB4XDTE4MTIw
NjExMTAxNloXDTIwMTIwNTExMTAxNlowggF2MRMwEQYKCZImiZPyLGQBGRYDb3Jn
MRYwFAYKCZImiZPyLGQBGRYGY2hlZXNlMQ8wDQYDVQQKDAZDaGVlc2UxETAPBgNV
BAoMCENoZWVzZSAyMR8wHQYDVQQLDBZTaW1wbGUgU2lnbmluZyBTZWN0aW9uMSEw
HwYDVQQLDBhTaW1wbGUgU2lnbmluZyBTZWN0aW9uIDIxFTATBgNVBAMMDCouY2hl
ZXNlLm9yZzEVMBMGA1UEAwwMKi5jaGVlc2UuY29tMQswCQYDVQQGEwJGUjELMAkG
A1UEBhMCVVMxETAPBgNVBAcMCFRPVUxPVVNFMQ0wCwYDVQQHDARMWU9OMRkwFwYD
VQQIDBBDaGVlc2Ugb3JnIHN0YXRlMRkwFwYDVQQIDBBDaGVlc2UgY29tIHN0YXRl
MR4wHAYJKoZIhvcNAQkBFg9jZXJ0QGNoZWVzZS5vcmcxHzAdBgkqhkiG9w0BCQEW
EGNlcnRAc2NoZWVzZS5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIB
AQDed/qNA3AwOd1RG8xg26laE7Gv/izGOJuICg+O2RuhHa8NZuQTW7xdNpLXXtD6
iCnTeOGB3piyqSI/v4qvEpJj1KnD8uR+0tyixTkceuvXEnBjLkFH4PAI6Ny+CQHs
KAmvNdd5nFA10Wvlh3s09tIxZR0YQmlsBBGD/kSukJItC3U5V2LmFy9HK8dT3RAt
yeMGE9K5umMuPH2Da9aJycydTb+f6KN72siZK7pm1o74QUGgydBeyBGkVUqTg4dj
BGNBnPtoBGfCcS/yZR0CXRXbLNkEaYXCfQ3qO6yF+NSPD8VwskXh7LJUC+n3grSb
Gy25JdSryo9bRD4V3bh/t+75AgMBAAGjgeAwgd0wDgYDVR0PAQH/BAQDAgWgMAkG
A1UdEwQCMAAwHQYDVR0lBBYwFAYIKwYBBQUHAwEGCCsGAQUFBwMCMB0GA1UdDgQW
BBSUunN4oof7WCgoz5g7wkVwFm4pLzAfBgNVHSMEGDAWgBQeUqLoVNU369WoHeTC
BB034vdwAzBhBgNVHREEWjBYggwqLmNoZWVzZS5vcmeCDCouY2hlZXNlLm5ldIIM
Ki5jaGVlc2UuY29thwQKAAEAhwQKAAECgQ90ZXN0QGNoZWVzZS5vcmeBD3Rlc3RA
Y2hlZXNlLm5ldDANBgkqhkiG9w0BAQUFAAOCAQEAdmsFsA40EbGDmZHcrhviCBWL
FrKbJxwCrLXfG9DQdaQrLFxl7Zmr983+OD/DmiIxG6yMHML5XdR1ei5yx4WpBK+f
KszTlnXwjsfGdkisRaS5Ah4vwBXEBwiSyydQZ6HIBcU6s6ZIvuvVWauiG5UwcRNb
CppzO2DMENBqx+XXiy/5Lpjy/4EUJAnjS1VXCRoidPH2QBMxQ4lxCpYaBYIfgzqH
mxcl71pV8i3NDU3kgVi2440JYpoMveTlXPCV2svHNCw0X238YHsSW4b93yGJO0gI
ML9n/4zmm1PMhzZHcEA72ZAq0tKCxpz10djg5v2qL5V+Oaz8TtTOZbPsxpiKMQ==
-----END CERTIFICATE-----
```
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### `pem`
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The `pem` option sets the `X-Forwarded-Tls-Client-Cert` header with the certificate.
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In the example, it is the part between `-----BEGIN CERTIFICATE-----` and `-----END CERTIFICATE-----` delimiters:
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??? example "The data used by the pem option"
```
-----BEGIN CERTIFICATE-----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==
-----END CERTIFICATE-----
```
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!!! info "Extracted data"
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The delimiters and `\n` will be removed.
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If there are more than one certificate, they are separated by a "`,`".
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!!! warning "`X-Forwarded-Tls-Client-Cert` value could exceed the web server header size limit"
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The header size limit of web servers is commonly between 4kb and 8kb.
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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).
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### `info`
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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.
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But in the following, unless specified otherwise, all the header values examples are shown unescaped, for readability.
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The following example shows such a concatenation, when all the available fields are selected:
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```text
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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"
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```
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!!! info "Multiple certificates"
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If there are more than one certificate, they are separated by a `,` .
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#### `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"
```
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#### `info.notAfter`
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Set the `info.notAfter` option to `true` to add the `Not After` information from the `Validity` part.
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The data is taken from the following certificate part:
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```text
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Validity
Not After : Dec 5 11:10:16 2020 GMT
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```
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And it is formatted as follows in the header:
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```text
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NA="1607166616"
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```
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#### `info.notBefore`
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Set the `info.notBefore` option to `true` to add the `Not Before` information from the `Validity` part.
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The data is taken from the following certificate part:
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```text
Validity
Not Before: Dec 6 11:10:16 2018 GMT
```
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And it is formatted as follows in the header:
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```text
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NB="1544094616"
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```
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#### `info.sans`
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Set the `info.sans` option to `true` to add the `Subject Alternative Name` information from the `Subject Alternative Name` part.
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The data is taken from the following certificate part:
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```text
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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
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```
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And it is formatted as follows in the header:
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```text
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SAN="*.example.org,*.example.net,*.example.com,test@example.org,test@example.net,10.0.1.0,10.0.1.2"
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```
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!!! info "Multiple values"
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The SANs are separated by a `,` .
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#### `info.subject`
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The `info.subject` selects the specific client certificate subject details you want to add to the `X-Forwarded-Tls-Client-Cert-Info` header.
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The data is taken from the following certificate part:
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```text
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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
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```
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##### `info.subject.country`
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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.
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And it is formatted as follows in the header:
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```text
C=FR,C=US
```
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##### `info.subject.province`
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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.
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And it is formatted as follows in the header:
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```text
ST=Cheese org state,ST=Cheese com state
```
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##### `info.subject.locality`
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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.
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And it is formatted as follows in the header:
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```text
L=TOULOUSE,L=LYON
```
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##### `info.subject.organization`
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Set the `info.subject.organization` option to `true` to add the `organization` information into the subject.
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The data is taken from the subject part with the `O` key.
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And it is formatted as follows in the header:
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```text
O=Cheese,O=Cheese 2
```
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##### `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
```
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##### `info.subject.commonName`
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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.
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And it is formatted as follows in the header:
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```text
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CN=*.example.com
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```
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##### `info.subject.serialNumber`
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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.
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And it is formatted as follows in the header:
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```text
SN=1234567890
```
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##### `info.subject.domainComponent`
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Set the `info.subject.domainComponent` option to `true` to add the `domainComponent` information into the subject.
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The data is taken from the subject part with the `DC` key.
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And it is formatted as follows in the header:
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```text
DC=org,DC=cheese
```
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#### `info.issuer`
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The `info.issuer` selects the specific client certificate issuer details you want to add to the `X-Forwarded-Tls-Client-Cert-Info` header.
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The data is taken from the following certificate part:
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```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
```
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##### `info.issuer.country`
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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.
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And it is formatted as follows in the header:
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```text
C=FR,C=US
```
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##### `info.issuer.province`
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Set the `info.issuer.province` option to `true` to add the `province` information into the issuer.
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The data is taken from the issuer part with the `ST` key.
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And it is formatted as follows in the header:
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```text
ST=Signing State,ST=Signing State 2
```
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##### `info.issuer.locality`
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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.
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And it is formatted as follows in the header:
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```text
L=TOULOUSE,L=LYON
```
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##### `info.issuer.organization`
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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.
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And it is formatted as follows in the header:
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```text
O=Cheese,O=Cheese 2
```
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##### `info.issuer.commonName`
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Set the `info.issuer.commonName` option to `true` to add the `commonName` information into the issuer.
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The data is taken from the issuer part with the `CN` key.
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And it is formatted as follows in the header:
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```text
CN=Simple Signing CA 2
```
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##### `info.issuer.serialNumber`
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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.
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And it is formatted as follows in the header:
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```text
SN=1234567890
```
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##### `info.issuer.domainComponent`
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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.
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And it is formatted as follows in the header:
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```text
DC=org,DC=cheese
```
