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Configure SSL

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Configure SSL

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You can specify SSL options when you configure:

outputs that support SSL
the Kibana endpoint
modules that define the host as an HTTP URL

Example output config with SSL enabled:

output.elasticsearch.hosts: ["https://192.168.1.42:9200"]
output.elasticsearch.ssl.certificate_authorities: ["/etc/client/ca.pem"]
output.elasticsearch.ssl.certificate: "/etc/client/cert.pem"
output.elasticsearch.ssl.key: "/etc/client/cert.key"

Also see Secure communication with Logstash.

Example Kibana endpoint config with SSL enabled:

setup.kibana.host: "https://192.0.2.255:5601"
setup.kibana.ssl.enabled: true
setup.kibana.ssl.certificate_authorities: ["/etc/client/ca.pem"]
setup.kibana.ssl.certificate: "/etc/client/cert.pem"
setup.kibana.ssl.key: "/etc/client/cert.key"

Example module with SSL enabled:

- module: http
  namespace: "myservice"
  enabled: true
  period: 10s
  hosts: ["https://localhost"]
  path: "/stats"
  headers:
    Authorization: "Bearer test123"
  ssl.verification_mode: "none"

There are a number of SSL configuration options available to you:

Common configuration options

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Common SSL configuration options can be used in both client and server configurations. You can specify the following options in the ssl section of each subsystem that supports SSL.

`enabled`

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To disable SSL configuration, set the value to false. The default value is true.

SSL settings are disabled if either enabled is set to false or the ssl section is missing.

`supported_protocols`

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List of allowed SSL/TLS versions. If SSL/TLS server decides for protocol versions not configured, the connection will be dropped during or after the handshake. The setting is a list of allowed protocol versions: TLSv1 for TLS version 1.0, TLSv1.0, TLSv1.1, TLSv1.2, and TLSv1.3.

The default value is [TLSv1.1, TLSv1.2, TLSv1.3].

`cipher_suites`

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The list of cipher suites to use. The first entry has the highest priority. If this option is omitted, the Go crypto library’s default suites are used (recommended).

Note that if TLS 1.3 is enabled (which is true by default), then the default TLS 1.3 cipher suites are always included, because Go’s standard library adds them to all connections. In order to exclude the default TLS 1.3 ciphers, TLS 1.3 must also be disabled, e.g. with the setting ssl.supported_protocols = [TLSv1.2].

The following cipher suites are available:

Cypher	Notes
ECDHE-ECDSA-AES-128-CBC-SHA
ECDHE-ECDSA-AES-128-CBC-SHA256	TLS 1.2 only. Disabled by default.
ECDHE-ECDSA-AES-128-GCM-SHA256	TLS 1.2 only.
ECDHE-ECDSA-AES-256-CBC-SHA
ECDHE-ECDSA-AES-256-GCM-SHA384	TLS 1.2 only.
ECDHE-ECDSA-CHACHA20-POLY1305	TLS 1.2 only.
ECDHE-ECDSA-RC4-128-SHA	Disabled by default. RC4 not recommended.
ECDHE-RSA-3DES-CBC3-SHA
ECDHE-RSA-AES-128-CBC-SHA
ECDHE-RSA-AES-128-CBC-SHA256	TLS 1.2 only. Disabled by default.
ECDHE-RSA-AES-128-GCM-SHA256	TLS 1.2 only.
ECDHE-RSA-AES-256-CBC-SHA
ECDHE-RSA-AES-256-GCM-SHA384	TLS 1.2 only.
ECDHE-RSA-CHACHA20-POLY1205	TLS 1.2 only.
ECDHE-RSA-RC4-128-SHA	Disabled by default. RC4 not recommended.
RSA-3DES-CBC3-SHA
RSA-AES-128-CBC-SHA
RSA-AES-128-CBC-SHA256	TLS 1.2 only. Disabled by default.
RSA-AES-128-GCM-SHA256	TLS 1.2 only.
RSA-AES-256-CBC-SHA
RSA-AES-256-GCM-SHA384	TLS 1.2 only.
RSA-RC4-128-SHA	Disabled by default. RC4 not recommended.

Here is a list of acronyms used in defining the cipher suites:

3DES: Cipher suites using triple DES
AES-128/256: Cipher suites using AES with 128/256-bit keys.
CBC: Cipher using Cipher Block Chaining as block cipher mode.
ECDHE: Cipher suites using Elliptic Curve Diffie-Hellman (DH) ephemeral key exchange.
ECDSA: Cipher suites using Elliptic Curve Digital Signature Algorithm for authentication.
GCM: Galois/Counter mode is used for symmetric key cryptography.
RC4: Cipher suites using RC4.
RSA: Cipher suites using RSA.
SHA, SHA256, SHA384: Cipher suites using SHA-1, SHA-256 or SHA-384.

`curve_types`

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The list of curve types for ECDHE (Elliptic Curve Diffie-Hellman ephemeral key exchange).

The following elliptic curve types are available:

P-256
P-384
P-521
X25519

`ca_sha256`

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This configures a certificate pin that you can use to ensure that a specific certificate is part of the verified chain.

The pin is a base64 encoded string of the SHA-256 of the certificate.

This check is not a replacement for the normal SSL validation, but it adds additional validation. If this option is used with verification_mode set to none, the check will always fail because it will not receive any verified chains.

Client configuration options

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You can specify the following options in the ssl section of each subsystem that supports SSL.

`certificate_authorities`

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The list of root certificates for verifications is required. If certificate_authorities is empty or not set, the system keystore is used. If certificate_authorities is self-signed, the host system needs to trust that CA cert as well.

By default you can specify a list of files that metricbeat will read, but you can also embed a certificate directly in the YAML configuration:

certificate_authorities:
  - |
    -----BEGIN CERTIFICATE-----
    MIIDCjCCAfKgAwIBAgITJ706Mu2wJlKckpIvkWxEHvEyijANBgkqhkiG9w0BAQsF
    ADAUMRIwEAYDVQQDDAlsb2NhbGhvc3QwIBcNMTkwNzIyMTkyOTA0WhgPMjExOTA2
    MjgxOTI5MDRaMBQxEjAQBgNVBAMMCWxvY2FsaG9zdDCCASIwDQYJKoZIhvcNAQEB
    BQADggEPADCCAQoCggEBANce58Y/JykI58iyOXpxGfw0/gMvF0hUQAcUrSMxEO6n
    fZRA49b4OV4SwWmA3395uL2eB2NB8y8qdQ9muXUdPBWE4l9rMZ6gmfu90N5B5uEl
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    yvgJ38BRsFOtkRuAGSf6ZUwTO8JJRRIFnpUzXflAnGivK9M13D5GEQMmIl6U9Pvk
    sxSmbIUfc2SGJGCJD4I=
    -----END CERTIFICATE-----

`certificate: "/etc/client/cert.pem"`

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The path to the certificate for SSL client authentication is only required if client_authentication is specified. If the certificate is not specified, client authentication is not available. The connection might fail if the server requests client authentication. If the SSL server does not require client authentication, the certificate will be loaded, but not requested or used by the server.

When this option is configured, the key option is also required. The certificate option support embedding of the certificate:

certificate: |
    -----BEGIN CERTIFICATE-----
    MIIDCjCCAfKgAwIBAgITJ706Mu2wJlKckpIvkWxEHvEyijANBgkqhkiG9w0BAQsF
    ADAUMRIwEAYDVQQDDAlsb2NhbGhvc3QwIBcNMTkwNzIyMTkyOTA0WhgPMjExOTA2
    MjgxOTI5MDRaMBQxEjAQBgNVBAMMCWxvY2FsaG9zdDCCASIwDQYJKoZIhvcNAQEB
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    fZRA49b4OV4SwWmA3395uL2eB2NB8y8qdQ9muXUdPBWE4l9rMZ6gmfu90N5B5uEl
    94NcfBfYOKi1fJQ9i7WKhTjlRkMCgBkWPkUokvBZFRt8RtF7zI77BSEorHGQCk9t
    /D7BS0GJyfVEhftbWcFEAG3VRcoMhF7kUzYwp+qESoriFRYLeDWv68ZOvG7eoWnP
    PsvZStEVEimjvK5NSESEQa9xWyJOmlOKXhkdymtcUd/nXnx6UTCFgnkgzSdTWV41
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    BBYEFPwN1OceFGm9v6ux8G+DZ3TUDYxqMB8GA1UdIwQYMBaAFPwN1OceFGm9v6ux
    8G+DZ3TUDYxqMA8GA1UdEwEB/wQFMAMBAf8wDQYJKoZIhvcNAQELBQADggEBAG5D
    874A4YI7YUwOVsVAdbWtgp1d0zKcPRR+r2OdSbTAV5/gcS3jgBJ3i1BN34JuDVFw
    3DeJSYT3nxy2Y56lLnxDeF8CUTUtVQx3CuGkRg1ouGAHpO/6OqOhwLLorEmxi7tA
    H2O8mtT0poX5AnOAhzVy7QW0D/k4WaoLyckM5hUa6RtvgvLxOwA0U+VGurCDoctu
    8F4QOgTAWyh8EZIwaKCliFRSynDpv3JTUwtfZkxo6K6nce1RhCWFAsMvDZL8Dgc0
    yvgJ38BRsFOtkRuAGSf6ZUwTO8JJRRIFnpUzXflAnGivK9M13D5GEQMmIl6U9Pvk
    sxSmbIUfc2SGJGCJD4I=
    -----END CERTIFICATE-----

`key: "/etc/client/cert.key"`

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The client certificate key used for client authentication and is only required if client_authentication is configured. The key option support embedding of the private key:

key: |
    -----BEGIN PRIVATE KEY-----
    MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQDXHufGPycpCOfI
    sjl6cRn8NP4DLxdIVEAHFK0jMRDup32UQOPW+DleEsFpgN9/ebi9ngdjQfMvKnUP
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    nMh1cclBAgMBAAECggEBAKdP5jyOicqknoG9/G564RcDsDyRt64NuO7I6hBg7SZx
    Jn7UKWDdFuFP/RYtoabn6QOxkVVlydp5Typ3Xu7zmfOyss479Q/HIXxmmbkD0Kp0
    eRm2KN3y0b6FySsS40KDRjKGQCuGGlNotW3crMw6vOvvsLTlcKgUHF054UVCHoK/
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    zrfZ5eUrBDWjRU2R8uppgRImsxMCgYEA2MxuL/C/Ko0d7XsSX1kM4JHJiGpQDvb5
    GUrlKjP/qVyUysNF92B9xAZZHxxfPWpdfGGBynhw7X6s+YeIoxTzFPZVV9hlkpAA
    5igma0n8ZpZEqzttjVdpOQZK8o/Oni/Q2S10WGftQOOGw5Is8+LY30XnLvHBJhO7
    TKMurJ4KCNsCgYAe5TDSVmaj3dGEtFC5EUxQ4nHVnQyCpxa8npL+vor5wSvmsfUF
    hO0s3GQE4sz2qHecnXuPldEd66HGwC1m2GKygYDk/v7prO1fQ47aHi9aDQB9N3Li
    e7Vmtdn3bm+lDjtn0h3Qt0YygWj+wwLZnazn9EaWHXv9OuEMfYxVgYKpdwKBgEze
    Zy8+WDm5IWRjn8cI5wT1DBT/RPWZYgcyxABrwXmGZwdhp3wnzU/kxFLAl5BKF22T
    kRZ+D+RVZvVutebE9c937BiilJkb0AXLNJwT9pdVLnHcN2LHHHronUhV7vetkop+
    kGMMLlY0lkLfoGq1AxpfSbIea9KZam6o6VKxEnPDAoGAFDCJm+ZtsJK9nE5GEMav
    NHy+PwkYsHhbrPl4dgStTNXLenJLIJ+Ke0Pcld4ZPfYdSyu/Tv4rNswZBNpNsW9K
    0NwJlyMBfayoPNcJKXrH/csJY7hbKviAHr1eYy9/8OL0dHf85FV+9uY5YndLcsDc
    nygO9KTJuUiBrLr0AHEnqko=
    -----END PRIVATE KEY-----

`key_passphrase`

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The passphrase used to decrypt an encrypted key stored in the configured key file.

`verification_mode`

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Controls the verification of server certificates. Valid values are:

full

Verifies that the provided certificate is signed by a trusted authority (CA) and also verifies that the server’s hostname (or IP address) matches the names identified within the certificate.

strict

Verifies that the provided certificate is signed by a trusted authority (CA) and also verifies that the server’s hostname (or IP address) matches the names identified within the certificate. If the Subject Alternative Name is empty, it returns an error.

certificate

Verifies that the provided certificate is signed by a trusted authority (CA), but does not perform any hostname verification.

none

Performs no verification of the server’s certificate. This mode disables many of the security benefits of SSL/TLS and should only be used after cautious consideration. It is primarily intended as a temporary diagnostic mechanism when attempting to resolve TLS errors; its use in production environments is strongly discouraged.

The default value is full.

`ca_trusted_fingerprint`

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A HEX encoded SHA-256 of a CA certificate. If this certificate is present in the chain during the handshake, it will be added to the certificate_authorities list and the handshake will continue normaly.

Server configuration options

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You can specify the following options in the ssl section of each subsystem that supports SSL.

`certificate_authorities`

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The list of root certificates for client verifications is only required if client_authentication is configured. If certificate_authorities is empty or not set, and client_authentication is configured, the system keystore is used.

If certificate_authorities is self-signed, the host system needs to trust that CA cert as well. By default you can specify a list of files that metricbeat will read, but you can also embed a certificate directly in the YAML configuration:

certificate_authorities:
  - |
    -----BEGIN CERTIFICATE-----
    MIIDCjCCAfKgAwIBAgITJ706Mu2wJlKckpIvkWxEHvEyijANBgkqhkiG9w0BAQsF
    ADAUMRIwEAYDVQQDDAlsb2NhbGhvc3QwIBcNMTkwNzIyMTkyOTA0WhgPMjExOTA2
    MjgxOTI5MDRaMBQxEjAQBgNVBAMMCWxvY2FsaG9zdDCCASIwDQYJKoZIhvcNAQEB
    BQADggEPADCCAQoCggEBANce58Y/JykI58iyOXpxGfw0/gMvF0hUQAcUrSMxEO6n
    fZRA49b4OV4SwWmA3395uL2eB2NB8y8qdQ9muXUdPBWE4l9rMZ6gmfu90N5B5uEl
    94NcfBfYOKi1fJQ9i7WKhTjlRkMCgBkWPkUokvBZFRt8RtF7zI77BSEorHGQCk9t
    /D7BS0GJyfVEhftbWcFEAG3VRcoMhF7kUzYwp+qESoriFRYLeDWv68ZOvG7eoWnP
    PsvZStEVEimjvK5NSESEQa9xWyJOmlOKXhkdymtcUd/nXnx6UTCFgnkgzSdTWV41
    CI6B6aJ9svCTI2QuoIq2HxX/ix7OvW1huVmcyHVxyUECAwEAAaNTMFEwHQYDVR0O
    BBYEFPwN1OceFGm9v6ux8G+DZ3TUDYxqMB8GA1UdIwQYMBaAFPwN1OceFGm9v6ux
    8G+DZ3TUDYxqMA8GA1UdEwEB/wQFMAMBAf8wDQYJKoZIhvcNAQELBQADggEBAG5D
    874A4YI7YUwOVsVAdbWtgp1d0zKcPRR+r2OdSbTAV5/gcS3jgBJ3i1BN34JuDVFw
    3DeJSYT3nxy2Y56lLnxDeF8CUTUtVQx3CuGkRg1ouGAHpO/6OqOhwLLorEmxi7tA
    H2O8mtT0poX5AnOAhzVy7QW0D/k4WaoLyckM5hUa6RtvgvLxOwA0U+VGurCDoctu
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    yvgJ38BRsFOtkRuAGSf6ZUwTO8JJRRIFnpUzXflAnGivK9M13D5GEQMmIl6U9Pvk
    sxSmbIUfc2SGJGCJD4I=
    -----END CERTIFICATE-----

`certificate: "/etc/server/cert.pem"`

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For server authentication, the path to the SSL authentication certificate must be specified for TLS. If the certificate is not specified, startup will fail.

When this option is configured, the key option is also required. The certificate option support embedding of the certificate:

certificate: |
    -----BEGIN CERTIFICATE-----
    MIIDCjCCAfKgAwIBAgITJ706Mu2wJlKckpIvkWxEHvEyijANBgkqhkiG9w0BAQsF
    ADAUMRIwEAYDVQQDDAlsb2NhbGhvc3QwIBcNMTkwNzIyMTkyOTA0WhgPMjExOTA2
    MjgxOTI5MDRaMBQxEjAQBgNVBAMMCWxvY2FsaG9zdDCCASIwDQYJKoZIhvcNAQEB
    BQADggEPADCCAQoCggEBANce58Y/JykI58iyOXpxGfw0/gMvF0hUQAcUrSMxEO6n
    fZRA49b4OV4SwWmA3395uL2eB2NB8y8qdQ9muXUdPBWE4l9rMZ6gmfu90N5B5uEl
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    /D7BS0GJyfVEhftbWcFEAG3VRcoMhF7kUzYwp+qESoriFRYLeDWv68ZOvG7eoWnP
    PsvZStEVEimjvK5NSESEQa9xWyJOmlOKXhkdymtcUd/nXnx6UTCFgnkgzSdTWV41
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    yvgJ38BRsFOtkRuAGSf6ZUwTO8JJRRIFnpUzXflAnGivK9M13D5GEQMmIl6U9Pvk
    sxSmbIUfc2SGJGCJD4I=
    -----END CERTIFICATE-----

`key: "/etc/server/cert.key"`

edit

The server certificate key used for authentication is required. The key option support embedding of the private key:

key: |
    -----BEGIN PRIVATE KEY-----
    MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQDXHufGPycpCOfI
    sjl6cRn8NP4DLxdIVEAHFK0jMRDup32UQOPW+DleEsFpgN9/ebi9ngdjQfMvKnUP
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    e7Vmtdn3bm+lDjtn0h3Qt0YygWj+wwLZnazn9EaWHXv9OuEMfYxVgYKpdwKBgEze
    Zy8+WDm5IWRjn8cI5wT1DBT/RPWZYgcyxABrwXmGZwdhp3wnzU/kxFLAl5BKF22T
    kRZ+D+RVZvVutebE9c937BiilJkb0AXLNJwT9pdVLnHcN2LHHHronUhV7vetkop+
    kGMMLlY0lkLfoGq1AxpfSbIea9KZam6o6VKxEnPDAoGAFDCJm+ZtsJK9nE5GEMav
    NHy+PwkYsHhbrPl4dgStTNXLenJLIJ+Ke0Pcld4ZPfYdSyu/Tv4rNswZBNpNsW9K
    0NwJlyMBfayoPNcJKXrH/csJY7hbKviAHr1eYy9/8OL0dHf85FV+9uY5YndLcsDc
    nygO9KTJuUiBrLr0AHEnqko=
    -----END PRIVATE KEY-----

`key_passphrase`

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The passphrase is used to decrypt an encrypted key stored in the configured key file.

`verification_mode`

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Controls the verification of client certificates. Valid values are:

full

Verifies that the provided certificate is signed by a trusted authority (CA) and also verifies that the server’s hostname (or IP address) matches the names identified within the certificate.

strict

certificate

Verifies that the provided certificate is signed by a trusted authority (CA), but does not perform any hostname verification.

none

The default value is full.

`renegotiation`

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This configures what types of TLS renegotiation are supported. The valid options are:

never

Disables renegotiation.

once

Allows a remote server to request renegotiation once per connection.

freely

Allows a remote server to request renegotiation repeatedly.

The default value is never.

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