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TLS.md

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Transport Layer Security

There is an ongoing effort to standardize TLS options across plugins. When possible, plugins will provide the standard settings described below. With the exception of the advanced configuration available TLS settings will be documented in the sample configuration.

Client Configuration

For client TLS support we have the following options:

## Root certificates for verifying server certificates encoded in PEM format.
# tls_ca = "/etc/telegraf/ca.pem"

## The public and private keypairs for the client encoded in PEM format.  May
## contain intermediate certificates.
# tls_cert = "/etc/telegraf/cert.pem"
# tls_key = "/etc/telegraf/key.pem"
## Skip TLS verification.
# insecure_skip_verify = false

Advanced Configuration

For plugins using the standard client configuration you can also set several advanced settings. These options are not included in the sample configuration for the interest of brevity.

## Define list of allowed ciphers suites.  If not defined the default ciphers
## supported by Go will be used.
##   ex: tls_cipher_suites = [
## 	         "TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305",
## 	         "TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305",
## 	         "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
## 	         "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
## 	         "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
## 	         "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
## 	         "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256",
## 	         "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA",
## 	         "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256",
## 	         "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA",
## 	         "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA",
## 	         "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA",
## 	         "TLS_RSA_WITH_AES_128_GCM_SHA256",
## 	         "TLS_RSA_WITH_AES_256_GCM_SHA384",
## 	         "TLS_RSA_WITH_AES_128_CBC_SHA256",
## 	         "TLS_RSA_WITH_AES_128_CBC_SHA",
## 	         "TLS_RSA_WITH_AES_256_CBC_SHA"
#       ]
# tls_cipher_suites = []

## Minimum TLS version that is acceptable.
# tls_min_version = "TLS10"

## Maximum SSL/TLS version that is acceptable.
# tls_max_version = "TLS12"

Cipher suites for use with tls_cipher_suites:

  • TLS_RSA_WITH_RC4_128_SHA
  • TLS_RSA_WITH_3DES_EDE_CBC_SHA
  • TLS_RSA_WITH_AES_128_CBC_SHA
  • TLS_RSA_WITH_AES_256_CBC_SHA
  • TLS_RSA_WITH_AES_128_CBC_SHA256
  • TLS_RSA_WITH_AES_128_GCM_SHA256
  • TLS_RSA_WITH_AES_256_GCM_SHA384
  • TLS_ECDHE_ECDSA_WITH_RC4_128_SHA
  • TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
  • TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
  • TLS_ECDHE_RSA_WITH_RC4_128_SHA
  • TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA
  • TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
  • TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
  • TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256
  • TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
  • TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
  • TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
  • TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
  • TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
  • TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305
  • TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305

TLS 1.3 cipher suites require Telegraf 1.12 and Go 1.12 or later:

  • TLS_AES_128_GCM_SHA256
  • TLS_AES_256_GCM_SHA384
  • TLS_CHACHA20_POLY1305_SHA256

TLS versions for use with tls_min_version or tls_max_version:

  • TLS10
  • TLS11
  • TLS12
  • TLS13 (Telegraf 1.12 and Go 1.12 required, must enable TLS 1.3 using environment variables)

TLS 1.3

TLS 1.3 is available only on an opt-in basis in Go 1.12. To enable it, set the GODEBUG environment variable (comma-separated key=value options) such that it includes "tls13=1".

Server Configuration

The server TLS configuration provides support for TLS mutual authentication:

## Set one or more allowed client CA certificate file names to
## enable mutually authenticated TLS connections.
# tls_allowed_cacerts = ["/etc/telegraf/clientca.pem"]

## Add service certificate and key.
# tls_cert = "/etc/telegraf/cert.pem"
# tls_key = "/etc/telegraf/key.pem"