TLS Fieldsedit

Fields related to a TLS connection. These fields focus on the TLS protocol itself and intentionally avoids in-depth analysis of the related x.509 certificate files.

TLS Field Detailsedit

FieldDescriptionLevel

tls.cipher

String indicating the cipher used during the current connection.

type: keyword

example: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256

extended

tls.client.certificate

PEM-encoded stand-alone certificate offered by the client. This is usually mutually-exclusive of client.certificate_chain since this value also exists in that list.

type: keyword

example: MII...

extended

tls.client.certificate_chain

Array of PEM-encoded certificates that make up the certificate chain offered by the client. This is usually mutually-exclusive of client.certificate since that value should be the first certificate in the chain.

type: keyword

example: ['MII...', 'MII...']

extended

tls.client.hash.md5

Certificate fingerprint using the MD5 digest of DER-encoded version of certificate offered by the client. For consistency with other hash values, this value should be formatted as an uppercase hash.

type: keyword

example: 0F76C7F2C55BFD7D8E8B8F4BFBF0C9EC

extended

tls.client.hash.sha1

Certificate fingerprint using the SHA1 digest of DER-encoded version of certificate offered by the client. For consistency with other hash values, this value should be formatted as an uppercase hash.

type: keyword

example: 9E393D93138888D288266C2D915214D1D1CCEB2A

extended

tls.client.hash.sha256

Certificate fingerprint using the SHA256 digest of DER-encoded version of certificate offered by the client. For consistency with other hash values, this value should be formatted as an uppercase hash.

type: keyword

example: 0687F666A054EF17A08E2F2162EAB4CBC0D265E1D7875BE74BF3C712CA92DAF0

extended

tls.client.issuer

Distinguished name of subject of the issuer of the x.509 certificate presented by the client.

type: keyword

example: CN=MyDomain Root CA, OU=Infrastructure Team, DC=mydomain, DC=com

extended

tls.client.ja3

A hash that identifies clients based on how they perform an SSL/TLS handshake.

type: keyword

example: d4e5b18d6b55c71272893221c96ba240

extended

tls.client.not_after

Date/Time indicating when client certificate is no longer considered valid.

type: date

example: 2021-01-01T00:00:00.000Z

extended

tls.client.not_before

Date/Time indicating when client certificate is first considered valid.

type: date

example: 1970-01-01T00:00:00.000Z

extended

tls.client.server_name

Also called an SNI, this tells the server which hostname to which the client is attempting to connect. When this value is available, it should get copied to destination.domain.

type: keyword

example: www.elastic.co

extended

tls.client.subject

Distinguished name of subject of the x.509 certificate presented by the client.

type: keyword

example: CN=myclient, OU=Documentation Team, DC=mydomain, DC=com

extended

tls.client.supported_ciphers

Array of ciphers offered by the client during the client hello.

type: keyword

example: ['TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384', 'TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384', '...']

extended

tls.curve

String indicating the curve used for the given cipher, when applicable.

type: keyword

example: secp256r1

extended

tls.established

Boolean flag indicating if the TLS negotiation was successful and transitioned to an encrypted tunnel.

type: boolean

extended

tls.next_protocol

String indicating the protocol being tunneled. Per the values in the IANA registry (https://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-values.xhtml#alpn-protocol-ids), this string should be lower case.

type: keyword

example: http/1.1

extended

tls.resumed

Boolean flag indicating if this TLS connection was resumed from an existing TLS negotiation.

type: boolean

extended

tls.server.certificate

PEM-encoded stand-alone certificate offered by the server. This is usually mutually-exclusive of server.certificate_chain since this value also exists in that list.

type: keyword

example: MII...

extended

tls.server.certificate_chain

Array of PEM-encoded certificates that make up the certificate chain offered by the server. This is usually mutually-exclusive of server.certificate since that value should be the first certificate in the chain.

type: keyword

example: ['MII...', 'MII...']

extended

tls.server.hash.md5

Certificate fingerprint using the MD5 digest of DER-encoded version of certificate offered by the server. For consistency with other hash values, this value should be formatted as an uppercase hash.

type: keyword

example: 0F76C7F2C55BFD7D8E8B8F4BFBF0C9EC

extended

tls.server.hash.sha1

Certificate fingerprint using the SHA1 digest of DER-encoded version of certificate offered by the server. For consistency with other hash values, this value should be formatted as an uppercase hash.

type: keyword

example: 9E393D93138888D288266C2D915214D1D1CCEB2A

extended

tls.server.hash.sha256

Certificate fingerprint using the SHA256 digest of DER-encoded version of certificate offered by the server. For consistency with other hash values, this value should be formatted as an uppercase hash.

type: keyword

example: 0687F666A054EF17A08E2F2162EAB4CBC0D265E1D7875BE74BF3C712CA92DAF0

extended

tls.server.issuer

Subject of the issuer of the x.509 certificate presented by the server.

type: keyword

example: CN=MyDomain Root CA, OU=Infrastructure Team, DC=mydomain, DC=com

extended

tls.server.ja3s

A hash that identifies servers based on how they perform an SSL/TLS handshake.

type: keyword

example: 394441ab65754e2207b1e1b457b3641d

extended

tls.server.not_after

Timestamp indicating when server certificate is no longer considered valid.

type: date

example: 2021-01-01T00:00:00.000Z

extended

tls.server.not_before

Timestamp indicating when server certificate is first considered valid.

type: date

example: 1970-01-01T00:00:00.000Z

extended

tls.server.subject

Subject of the x.509 certificate presented by the server.

type: keyword

example: CN=www.mydomain.com, OU=Infrastructure Team, DC=mydomain, DC=com

extended

tls.version

Numeric part of the version parsed from the original string.

type: keyword

example: 1.2

extended

tls.version_protocol

Normalized lowercase protocol name parsed from original string.

type: keyword

example: tls

extended