TLS fields

Elastic Stack Serverless

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.

Field	Description	Level
tls.cipher	String indicating the cipher used during the current connection. type: keyword example: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 tls.cipher	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... tls.client.certificate	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 Note: this field should contain an array of values. example: ["MII...", "MII..."] tls.client.certificate_chain	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 tls.client.hash.md5	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 tls.client.hash.sha1	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 tls.client.hash.sha256	extended
tls.client.issuer	Distinguished name of subject of the issuer of the x.509 certificate presented by the client. type: keyword example: CN=Example Root CA, OU=Infrastructure Team, DC=example, DC=com tls.client.issuer	extended
tls.client.ja3	A hash that identifies clients based on how they perform an SSL/TLS handshake. type: keyword example: d4e5b18d6b55c71272893221c96ba240 tls.client.ja3	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 tls.client.not_after	extended
tls.client.not_before	Date/Time indicating when client certificate is first considered valid. type: date example: 1970-01-01T00:00:00.000Z tls.client.not_before	extended
tls.client.server_name	Also called an SNI, this tells the server which hostname to which the client is attempting to connect to. 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=example, DC=com tls.client.subject	extended
tls.client.supported_ciphers	Array of ciphers offered by the client during the client hello. type: keyword Note: this field should contain an array of values. example: ["TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384", "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384", "..."] tls.client.supported_ciphers	extended
tls.curve	String indicating the curve used for the given cipher, when applicable. type: keyword example: secp256r1 tls.curve	extended
tls.established	Boolean flag indicating if the TLS negotiation was successful and transitioned to an encrypted tunnel. type: boolean tls.established	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 tls.next_protocol	extended
tls.resumed	Boolean flag indicating if this TLS connection was resumed from an existing TLS negotiation. type: boolean tls.resumed	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... tls.server.certificate	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 Note: this field should contain an array of values. example: ["MII...", "MII..."] tls.server.certificate_chain	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 tls.server.hash.md5	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 tls.server.hash.sha1	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 tls.server.hash.sha256	extended
tls.server.issuer	Subject of the issuer of the x.509 certificate presented by the server. type: keyword example: CN=Example Root CA, OU=Infrastructure Team, DC=example, DC=com tls.server.issuer	extended
tls.server.ja3s	A hash that identifies servers based on how they perform an SSL/TLS handshake. type: keyword example: 394441ab65754e2207b1e1b457b3641d tls.server.ja3s	extended
tls.server.not_after	Timestamp indicating when server certificate is no longer considered valid. type: date example: 2021-01-01T00:00:00.000Z tls.server.not_after	extended
tls.server.not_before	Timestamp indicating when server certificate is first considered valid. type: date example: 1970-01-01T00:00:00.000Z tls.server.not_before	extended
tls.server.subject	Subject of the x.509 certificate presented by the server. type: keyword example: CN=www.example.com, OU=Infrastructure Team, DC=example, DC=com tls.server.subject	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