JSON Data Format

This page will guide you through the JSON logs format produced by Clear NDR® Central Server and details the different fields and values combination.

Example:

{
    "timestamp": "2009-11-24T21:27:09.534255",
    "event_type": "alert",
    "src_ip": "192.168.2.7",
    "src_port": 1041,
    "dest_ip": "x.x.250.50",
    "dest_port": 80,
    "proto": "TCP",
    "alert": {
        "action": "allowed",
        "gid": 1,
        "signature_id" :2001999,
        "rev": 9,
        "signature": "ET MALWARE BTGrab.com Spyware Downloading Ads",
        "category": "A Network Trojan was detected",
        "severity": 1
    }
}

Common Section

All the JSON log types share a common structure:

{"timestamp":"2009-11-24T21:27:09.534255","event_type":"TYPE", ...tuple... ,"TYPE":{ ... type specific content ... }}

Event types

The common part has a field “event_type” to indicate the log type.

"event_type":"TYPE"

Possible values are: STAMUS, ALERTS, ANOMALY, DCERPC, DHCP, DNP3, DNS, Fileinfo, FLOW, FTP, FTP_DATA, HTTP, IKE, KRB5, MQTT, NETFLOW, NFS, RDP, RFB, SIP, SMB, SMTP, SNMP, STATS, SSH, TFTP, TLS

PCAP fields

If Suricata is processing a pcap file, additional fields are added:

"pcap_cnt": 123

pcap_cnt contains the packet number in the pcap. This can be used to look up a packet in Wireshark for example.

"pcap_filename":"/path/to/file.pcap"

pcap_filename contains the file name and location of the pcap that generated the event.

Note

the pcap fields are only available on “real” packets, and are omitted from internal “pseudo” packets such as flow timeout packets.

Alert Events

Possible values: “allowed” and “blocked”

Example:

"action":"allowed"

Action is set to “allowed” unless when the rule is used the “reject” action.

It can contain information about Source and Target of the attack in the alert.source and alert.target field it target keyword is used in the signature.

"alert": {
  "action": "allowed",
  "gid": 1,
  "signature_id": 1,
  "rev": 1,
  "app_proto": "http",
  "signature": "HTTP body talking about corruption",
  "severity": 3,
  "source": {
    "ip": "192.168.43.32",
    "port": 36292
  },
  "target": {
    "ip": "179.60.192.3",
    "port": 80
  },

Stamus Events

Events with the event_type stamus are part of a Declaration of Compromise® or a Declaration of Policy Violation®. See Declaration of Compromise® and Declaration of Policy Violation® for more information on the concept.

A typical Stamus event will have regular common fields and a “stamus” section that looks like this:

"stamus": {
  "extra_info": null,
  "source": "192.168.2.23",
  "family_name": "Lateral Movement",
  "incidents_id": [71],
  "threat_id": 399,
  "asset_net_info": "wifi-users-hq.organization-acme",
  "pk": 3581,
  "asset_info": {
    "first_seen": "2025-07-24T02:40:34.968258Z",
    "last_seen": "2025-07-24T02:40:44.977144Z",
    "event_id": 88,
    "incident_id": 71,
    "kill_chain": "delivery",
    "state": "ongoing"
  },
  "method_id": 1002026992,
  "family_type": "family",
  "event_id": 88,
  "offender_type": "ip",
  "asset_type": "ip",
  "family_id": 7,
  "threat_name": "Powershell",
  "asset": "192.168.100.60",
  "kill_chain": "delivery"
}

Fields

  • asset: The asset that is the subject/victim of this event. This can be an IP address, a hostname, a mail, or a user.

  • asset_type: The type of the asset, such as “ip”, “hostname”, or “user”.

  • asset_net_info: Network definition information about the asset

  • offender: The offender that took part in this event. This can be an IP address, a hostname, a mail, or a user.

  • offender_type: The type of the offender, such as “ip”, “hostname”, or “user”.

  • threat_name: The name of the threat associated with this event.

  • family_name: The name of the family this threat belongs to.

  • kill_chain: The kill chain phase this event is associated with. This can be “pre_condition”, “delivery”, “exploitation”, “installation”, “command_and_control”, or “action_on_objectives”. “pre_condition” is used for Declarations of Policy Violations, while the other phases are used for Declarations of Compromise.

  • incidents_id: List of incident IDs this event is associated with. This corresponds to the Declaration of Compromise or Declaration of Policy Violation linked to this event. There will be two elements in the list if the offender is tracked.

  • threat_id: The unique identifier of the threat associated with this event. See Deep linking to DoC/DOPV GUI for more information on how to link to the GUI of Clear NDR®.

  • family_id: The unique identifier of the family this threat belongs to. See Deep linking to DoC/DOPV GUI for more information on how to link to the GUI of Clear NDR®.

  • method_id: The unique identifier of the detection method that triggered this event.

  • asset_info: information about the asset

    • first_seen: The first time the threat was seen on this asset.

    • last_seen: The last time the threat was seen on this asset.

    • state: The state of the asset in relation to the threat. The value can be “new” (initial discovery of threat on asset), “ongoing” (proof of threat activity on asset), or “kill_chain_increase” (threat activity has reached a new step in the kill chain).

    • kill_chain: The highest kill chain phase seen for this threat on the asset. This can be “pre_condition”, “delivery”, “exploitation”, “installation”, “command_and_control”, or “action_on_objectives”. “pre_condition” is used for Declarations of Policy Violations, while the other phases are used for Declarations of Compromise.

    • incident_id: The incident ID this event is associated with on the asset side. This corresponds to the Declaration of Compromise or Declaration of Policy Violation linked to this event.

    • event_id: unique identifier of the occurences of a given detection method triggering on a given asset.

In the case of a threat where the offender is also tracked (some Lateral Movement, for example), the following fields are also present:

  • offender_info: information about the offender

    • first_seen: The first time the threat was seen on the offender.

    • last_seen: The last time the threat was seen on the offender.

    • state: The state of the offender in relation to the threat. The value can be “new” (initial discovery of threat on offender), “ongoing” (proof of threat activity on offender), or “kill_chain_increase” (threat activity has reached a new step in the kill chain).

    • kill_chain_offender: The highest kill chain phase seen for this threat triggered by the offender. This can be “delivery”, “exploitation”, “installation”, “command_and_control”, or “action_on_objectives”.

    • incident_id: The incident ID this event is associated with on the offender side. This corresponds to the Declaration of Compromise linked to this event.

    • event_id: unique identifier of the occurences of a given detection method triggered by a given offender.

Anomaly Events

Events with type “anomaly” report unexpected conditions such as truncated packets, packets with invalid values, events that render the packet invalid for further processing or unexpected behaviors.

Networks which experience high occurrences of anomalies may experience packet processing degradation when anomaly logging is enabled.

Fields

  • type: Either “decode”, “stream” or “applayer”. In rare cases, type will be “unknown”. When this occurs, an additional field named “code” will be present. Events with type “applayer” are detected by the application layer parsers.

  • event: The name of the anomalous event. Events of type “decode” are prefixed with “decoder”; events of type “stream” are prefixed with “stream”.

  • code: If “type” is “unknown”, than “code” contains the unrecognized event code. Otherwise, this field is not present.

The following field is included when “type” has the value “applayer”:

  • layer: Indicates the handling layer that detected the event. This will be “proto_parser” (protocol parser), “proto_detect” (protocol detection) or “parser.”

When packethdr is enabled, the first 32 bytes of the packet are included as a byte64-encoded blob in the main part of record. This applies to events of “type” “packet” or “stream” only.

Examples

"anomaly": {
  "type": "decode",
  "event": "decoder.icmpv4.unknown_type"
}

"anomaly": {
  "type": "decode",
  "event": "decoder.udp.pkt_too_small"
}

"anomaly": {
  "type": "decode",
  "event": "decoder.ipv4.wrong_ip_version"
}

"anomaly": {
  "type": "stream",
  "event": "stream.pkt_invalid_timestamp"
}

{
  "timestamp": "1969-12-31T16:04:21.000000-0800",
  "pcap_cnt": 9262,
  "event_type": "anomaly",
  "src_ip": "208.21.2.184",
  "src_port": 0,
  "dest_ip": "10.1.1.99",
  "dest_port": 0,
  "proto": "UDP",
  "packet": "////////AQEBAQEBCABFAAA8xZ5AAP8R1+DQFQK4CgE=",
  "packet_info": {
    "linktype": 1
  },
  "anomaly": {
    "type": "decode",
    "event": "decoder.udp.pkt_too_small"
  }
}

{
  "timestamp": "2016-01-11T05:10:54.612110-0800",
  "flow_id": 412547343494194,
  "pcap_cnt": 1391293,
  "event_type": "anomaly",
  "src_ip": "192.168.122.149",
  "src_port": 49324,
  "dest_ip": "69.195.71.174",
  "dest_port": 443,
  "proto": "TCP",
  "app_proto": "tls",
  "anomaly": {
    "type": "applayer",
    "event": "APPLAYER_DETECT_PROTOCOL_ONLY_ONE_DIRECTION",
    "layer": "proto_detect"
  }
}

{
  "timestamp": "2016-01-11T05:10:52.828802-0800",
  "flow_id": 201217772575257,
  "pcap_cnt": 1391281,
  "event_type": "anomaly",
  "src_ip": "192.168.122.149",
  "src_port": 49323,
  "dest_ip": "69.195.71.174",
  "dest_port": 443,
  "proto": "TCP",
  "tx_id": 0,
  "app_proto": "tls",
  "anomaly": {
    "type": "applayer",
    "event": "INVALID_RECORD_TYPE",
    "layer": "proto_parser"
  }
}

HTTP Events

Fields

  • hostname: The hostname this HTTP event is attributed to

  • url: URL at the hostname that was accessed

  • http_user_agent: The user-agent of the software that was used

  • http_content_type: The type of data returned (ex: application/x-gzip)

  • “cookie”

In addition to these fields, if the extended logging is enabled in the suricata.yaml file the following fields are (can) also included:

  • length: The content size of the HTTP body

  • status: HTTP status code

  • protocol: Protocol / Version of HTTP (ex: HTTP/1.1)

  • http_method: The HTTP method (ex: GET, POST, HEAD)

  • http_refer: The referrer for this action

In addition to the extended logging fields one can also choose to enable/add from more than 50 additional custom logging HTTP fields enabled in the suricata.yaml file. The additional fields can be enabled as following:

In Administration, select Appliances, select View the device that is needed. In the right upper corner select the HTTP protocol, adjust the settings as needed.

The benefits here of using the extended logging is to see if this action for example was a POST or perhaps if a download of an executable actually returned any bytes.

It is also possible to dump every header for HTTP requests/responses or both via the setting dump-all-headers.

Examples

Event with non-extended logging:

"http": {
    "hostname": "www.digip.org",
    "url" :"\/jansson\/releases\/jansson-2.6.tar.gz",
    "http_user_agent": "<User-Agent>",
    "http_content_type": "application\/x-gzip"
}

In case the hostname shows a port number, such as in case there is a header “Host: www.test.org:1337”:

"http": {
    "http_port": 1337,
    "hostname": "www.test.org",
    "url" :"\/this\/is\/test.tar.gz",
    "http_user_agent": "<User-Agent>",
    "http_content_type": "application\/x-gzip"
}

Event with extended logging:

"http": {
    "hostname": "direkte.vg.no",
    "url": ".....",
    "http_user_agent": "<User-Agent>",
    "http_content_type": "application\/json",
    "http_refer": "http:\/\/www.vg.no\/",
    "http_method": "GET",
    "protocol": "HTTP\/1.1",
    "status":"200",
    "length":310
}

Event with dump-all-headers enabled:

"http": {
    "hostname": "test.co.uk",
    "url": "\/test\/file.json",
    "http_user_agent": "<User-Agent>",
    "http_content_type": "application\/json",
    "http_refer": "http:\/\/www.test.com\/",
    "http_method": "GET",
    "protocol": "HTTP\/1.1",
    "status": "200",
    "length":310,
    "request_headers": [
        {
            "name": "User-Agent",
            "value": "Wget/1.13.4 (linux-gnu)"
        },
        {
            "name": "Accept",
            "value": "*/*"
        },
    ],
    "response_headers": [
        {
            "name": "Date",
            "value": "Wed, 25 Mar 2015 15:40:41 GMT"
        },
    ]
}

DNS Events

A new version of dns logging has been introduced to improve how dns answers are logged.

With that new version, dns answers are logged in one event rather than an event for each answer.

It’s possible to customize how a dns answer will be logged with the following formats:

  • detailed: “rrname”, “rrtype”, “rdata” and “ttl” fields are logged for each answer

  • grouped: answers logged are aggregated by their type (A, AAAA, NS, …)

It will be still possible to use the old DNS logging format, you can control it with “version” option in dns configuration section.

Fields

Outline of fields seen in the different kinds of DNS events:

  • type: Indicating DNS message type, can be “answer” or “query”.

  • id: Identifier field

  • version: Indicating DNS logging version in use

  • flags: Indicating DNS answer flag, in hexadecimal (ex: 8180 , please note 0x is not output)

  • qr: Indicating in case of DNS answer flag, Query/Response flag (ex: true if set)

  • aa: Indicating in case of DNS answer flag, Authoritative Answer flag (ex: true if set)

  • tc: Indicating in case of DNS answer flag, Truncation flag (ex: true if set)

  • rd: Indicating in case of DNS answer flag, Recursion Desired flag (ex: true if set)

  • ra: Indicating in case of DNS answer flag, Recursion Available flag (ex: true if set)

  • z: Indicating in case of DNS answer flag, Reserved bit (ex: true if set)

  • rcode: (ex: NOERROR)

  • rrname: Resource Record Name (ex: a domain name)

  • rrtype: Resource Record Type (ex: A, AAAA, NS, PTR)

  • rdata: Resource Data (ex: IP that domain name resolves to)

  • ttl: Time-To-Live for this resource record

More complex DNS record types may log additional fields for resource data:

  • soa: Section containing fields for the SOA (start of authority) record type

    • mname: Primary name server for this zone

    • rname: Authority’s mailbox

    • serial: Serial version number

    • refresh: Refresh interval (seconds)

    • retry: Retry interval (seconds)

    • expire: Upper time limit until zone is no longer authoritative (seconds)

    • minimum: Minimum ttl for records in this zone (seconds)

  • sshfp: section containing fields for the SSHFP (ssh fingerprint) record type

    • fingerprint: Hex format of the fingerprint (ex: 12:34:56:78:9a:bc:de:...)

    • algo: Algorithm number (ex: 1 for RSA, 2 for DSS)

    • type: Fingerprint type (ex: 1 for SHA-1)

One can control which RR types are logged by using the “types” field in the suricata.yaml file. If this field is not specified, all RR types are logged. More than 50 values can be specified with this field as shown below:

types: [a, ns, md, mf, cname, soa, mb, mg, mr, null,
wks, ptr, hinfo, minfo, mx, txt, rp, afsdb, x25, isdn,
rt, nsap, nsapptr, sig, key, px, gpos, aaaa, loc, nxt,
srv, atma, naptr, kx, cert, a6, dname, opt, apl, ds,
sshfp, ipseckey, rrsig, nsec, dnskey, dhcid, nsec3,
nsec3param, tlsa, hip, cds, cdnskey, spf, tkey,
tsig, maila, any, uri]

In Administration, select Appliances, select View the device that is needed. In the right upper corner select the DNS protocol, adjust the settings as needed.

Examples

Example of a DNS query for the IPv4 address of “twitter.com” (resource record type ‘A’):

"dns": {
    "type": "query",
    "id": 16000,
    "rrname": "twitter.com",
    "rrtype": "A"
}

Example of a DNS answer with “detailed” format:

"dns": {
    "version": 2,
    "type": "answer",
    "id": 45444,
    "flags": "8180",
    "qr": true,
    "rd": true,
    "ra": true,
    "rcode": "NOERROR",
    "answers": [
      {
        "rrname": "www.suricata-ids.org",
        "rrtype": "CNAME",
        "ttl": 3324,
        "rdata": "suricata-ids.org"
      },
      {
        "rrname": "suricata-ids.org",
        "rrtype": "A",
        "ttl": 10,
        "rdata": "192.0.78.24"
      },
      {
        "rrname": "suricata-ids.org",
        "rrtype": "A",
        "ttl": 10,
        "rdata": "192.0.78.25"
      }
    ]
}

Example of a DNS answer with “grouped” format:

"dns": {
    "version": 2,
    "type": "answer",
    "id": 18523,
    "flags": "8180",
    "qr": true,
    "rd": true,
    "ra": true,
    "rcode": "NOERROR",
    "grouped": {
      "A": [
        "192.0.78.24",
        "192.0.78.25"
      ],
      "CNAME": [
        "suricata-ids.org"
      ]
    }
}

Example of a old DNS answer with an IPv4 (resource record type ‘A’) return:

"dns": {
    "type": "answer",
    "id":16000,
    "flags":"8180",
    "qr":true,
    "rd":true,
    "ra":true,
    "rcode":"NOERROR"
    "rrname": "twitter.com",
    "rrtype":"A",
    "ttl":8,
    "rdata": "199.16.156.6"
}

IKE Events

The parser implementations for IKEv1 and IKEv2 have a slightly different feature set. They can be distinguished using the “version_major” field (which equals either 1 or 2). The unique properties are contained within a separate “ikev1” and “ikev2” sub-object.

Fields

  • init_spi", "resp_spi: The Security Parameter Index (SPI) of the initiator and responder.

  • version_major: Major version of the ISAKMP header.

  • version_minor: Minor version of the ISAKMP header.

  • payload: List of payload types in the current packet.

  • exchange_type: Type of the exchange, as numeric values.

  • exchange_type_verbose: Type of the exchange, in human-readable form. Needs extended: yes set in the ike EVE output option.

  • alg_enc, alg_hash, alg_auth, alg_dh, alg_esn: Properties of the chosen security association by the server.

  • ikev1.encrypted_payloads: Set to true if the payloads in the packet are encrypted.

  • ikev1.doi: Value of the domain of interpretation (DOI).

  • ikev1.server.key_exchange_payload, ikev1.client.key_exchange_payload: Public key exchange payloads of the server and client.

  • ikev1.server.key_exchange_payload_length, ikev1.client.key_exchange_payload_length: Length of the public key exchange payload.

  • ikev1.server.nonce_payload, ikev1.client.nonce_payload: Nonce payload of the server and client.

  • ikev1.server.nonce_payload_length, ikev1.client.nonce_payload_length: Length of the nonce payload.

  • ikev1.client.client_proposals: List of the security associations proposed to the server.

  • ikev1.vendor_ids: List of the vendor IDs observed in the communication.

  • server_proposals: List of server proposals with parameters, if there are more than one. This is a non-standard case; this field is only present if such a situation was observed in the inspected traffic.

Examples

Example of IKE logging:

"ike": {
  "version_major": 1,
  "version_minor": 0,
  "init_spi": "8511617bfea2f172",
  "resp_spi": "c0fc6bae013de0f5",
  "message_id": 0,
  "exchange_type": 2,
  "exchange_type_verbose": "Identity Protection",
  "sa_life_type": "LifeTypeSeconds",
  "sa_life_type_raw": 1,
  "sa_life_duration": "Unknown",
  "sa_life_duration_raw": 900,
  "alg_enc": "EncAesCbc",
  "alg_enc_raw": 7,
  "alg_hash": "HashSha2_256",
  "alg_hash_raw": 4,
  "alg_auth": "AuthPreSharedKey",
  "alg_auth_raw": 1,
  "alg_dh": "GroupModp2048Bit",
  "alg_dh_raw": 14,
  "sa_key_length": "Unknown",
  "sa_key_length_raw": 256,
  "alg_esn": "NoESN",
  "payload": [
    "VendorID",
    "Transform",
    "Proposal",
    "SecurityAssociation"
  ],
  "ikev1": {
    "doi": 1,
    "encrypted_payloads": false,
    "client": {
      "key_exchange_payload": "0bf7907681a656aabed38fb1ba8918b10d707a8e635a...",
      "key_exchange_payload_length": 256,
      "nonce_payload": "1427d158fc1ed6bbbc1bd81e6b74960809c87d18af5f0abef14d5274ac232904",
      "nonce_payload_length": 32,
      "proposals": [
        {
          "sa_life_type": "LifeTypeSeconds",
          "sa_life_type_raw": 1,
          "sa_life_duration": "Unknown",
          "sa_life_duration_raw": 900,
          "alg_enc": "EncAesCbc",
          "alg_enc_raw": 7,
          "alg_hash": "HashSha2_256",
          "alg_hash_raw": 4,
          "alg_auth": "AuthPreSharedKey",
          "alg_auth_raw": 1,
          "alg_dh": "GroupModp2048Bit",
          "alg_dh_raw": 14,
          "sa_key_length": "Unknown",
          "sa_key_length_raw": 256
        }
      ]
    },
    "server": {
      "key_exchange_payload": "1e43be52b088ec840ff81865074b6d459b5ca7813b46...",
      "key_exchange_payload_length": 256,
      "nonce_payload": "04d78293ead007bc1a0f0c6c821a3515286a935af12ca50e08905b15d6c8fcd4",
      "nonce_payload_length": 32
    },
    "vendor_ids": [
      "4048b7d56ebce88525e7de7f00d6c2d3",
      "4a131c81070358455c5728f20e95452f",
      "afcad71368a1f1c96b8696fc77570100",
      "7d9419a65310ca6f2c179d9215529d56",
      "cd60464335df21f87cfdb2fc68b6a448",
      "90cb80913ebb696e086381b5ec427b1f"
    ]
  },
}

Modbus Events

Common fields

  • id: The unique transaction number given by Suricata

Request/Response fields

  • transaction_id: The transaction id found in the packet

  • protocol_id: The modbus version

  • unit_id: ID of the remote server to interact with

  • function_raw: Raw value of the function code byte

  • function_code: Associated name of the raw function value

  • access_type: Type of access requested by the function

  • category: The function code’s category

  • error_flags: Errors found in the data while parsing

Exception fields

  • raw: Raw value of the exception code byte

  • code: Associated name of the raw exception value

Diagnostic fields

  • raw: Raw value of the subfunction code bytes

  • code: Associated name of the raw subfunction value

  • data: Bytes following the subfunction code

MEI fields

  • raw: Raw value of the mei function code bytes

  • code: Associated name of the raw mei function value

  • data: Bytes following the mei function code

Read Request fields

  • address: Starting address to read from

  • quantity: Amount to read

Read Response fields

  • data: Data that was read

Multiple Write Request fields

  • address: Starting address to write to

  • quantity: Amount to write

  • data: Data to write

Mask Write fields

  • address: Starting address of content modification

  • and_mask: And mask to modify content with

  • or_mask: Or mask to modify content with

Other Write fields

  • address: Starting address to write to

  • data: Data to write

Generic Data fields

  • data: Data following the function code

Example

Example of Modbus logging of a request and response:

"modbus": {
  "id": 1,
  "request": {
    "transaction_id": 0,
    "protocol_id": 0,
    "unit_id": 0,
    "function_raw": 1,
    "function_code": "RdCoils",
    "access_type": "READ | COILS",
    "category": "PUBLIC_ASSIGNED",
    "error_flags": "NONE",
  },
  "response": {
    "transaction_id": 0,
    "protocol_id": 0,
    "unit_id": 0,
    "function_raw": 1,
    "function_code": "RdCoils",
    "access_type": "READ | COILS",
    "category": "PUBLIC_ASSIGNED",
    "error_flags": "DATA_VALUE",
  },
}

FTP Events

Fields

  • command: The FTP command.

  • command_data: The data accompanying the command.

  • reply: The command reply, which may contain multiple lines, in array format.

  • completion_code: The 3-digit completion code. The first digit indicates whether the response is good, bad or incomplete. This is also in array format and may contain multiple completion codes matching multiple reply lines.

  • dynamic_port: The dynamic port established for subsequent data transfers, when applicable, with a “PORT” or “EPRT” command.

  • mode: The type of FTP connection. Most connections are “passive” but may be “active”.

  • reply_received: Indicates whether a response was matched to the command. In some non-typical cases, a command may lack a response.

Examples

Example of regular FTP logging:

"ftp": {
  "command": "RETR",
  "command_data": "100KB.zip",
  "reply": [
    "Opening BINARY mode data connection for 100KB.zip (102400 bytes).",
    "Transfer complete."
  ],
  "completion_code": [
    "150",
    "226"
  ],

Example showing all fields:

"ftp": {
  "command": "EPRT",
  "command_data": "|2|2a01:e34:ee97:b130:8c3e:45ea:5ac6:e301|41813|",
  "reply": [
    "EPRT command successful. Consider using EPSV."
  ],
  "completion_code": [
    "200"
  ],
  "dynamic_port": 41813,
  "mode": "active",
  "reply_received": "yes"
}

FTP_DATA Events

Fields

  • command: The FTP command associated with the event.

  • filename: The name of the involved file.

Examples

Example of FTP_DATA logging:

"ftp_data": {
  "filename": "temp.txt",
  "command": "RETR"
}

TLS Events

Fields

  • subject: The subject field from the TLS certificate

  • issuer: The issuer field from the TLS certificate

  • session_resumed: This field has the value of “true” if the TLS session was resumed via a session id. If this field appears, “subject” and “issuer” do not appear, since a TLS certificate is not seen.

If extended logging is enabled the following fields are also included:

  • serial: The serial number of the TLS certificate

  • fingerprint: The (SHA1) fingerprint of the TLS certificate

  • sni: The Server Name Indication (SNI) extension sent by the client

  • version: The SSL/TLS version used

  • not_before: The NotBefore field from the TLS certificate

  • not_after: The NotAfter field from the TLS certificate

  • ja3: The JA3 fingerprint consisting of both a JA3 hash and a JA3 string

  • ja3s: The JA3S fingerprint consisting of both a JA3 hash and a JA3 string

JA3 must be enabled in the Suricata config file (set ‘app-layer.protocols.tls.ja3-fingerprints’ to ‘yes’).

In addition to this, custom logging also allows the following fields:

  • certificate: The TLS certificate base64 encoded

  • chain: The entire TLS certificate chain base64 encoded

Examples

Example of regular TLS logging:

"tls": {
    "subject": "C=US, ST=California, L=Mountain View, O=Google Inc, CN=*.google.com",
    "issuerdn": "C=US, O=Google Inc, CN=Google Internet Authority G2"
}

Example of regular TLS logging for resumed sessions:

"tls": {
    "session_resumed": true
}

Example of extended TLS logging:

"tls": {
    "subject": "C=US, ST=California, L=Mountain View, O=Google Inc, CN=*.google.com",
    "issuerdn": "C=US, O=Google Inc, CN=Google Internet Authority G2",
    "serial": "0C:00:99:B7:D7:54:C9:F6:77:26:31:7E:BA:EA:7C:1C",
    "fingerprint": "8f:51:12:06:a0:cc:4e:cd:e8:a3:8b:38:f8:87:59:e5:af:95:ca:cd",
    "sni": "calendar.google.com",
    "version": "TLS 1.2",
    "notbefore": "2017-01-04T10:48:43",
    "notafter": "2017-03-29T10:18:00"
}

Example of certificate logging using TLS custom logging (subject, sni, certificate):

"tls": {
    "subject": "C=US, ST=California, L=Mountain View, O=Google Inc, CN=*.googleapis.com",
    "sni": "www.googleapis.com",
    "certificate": "MIIE3TCCA8WgAwIBAgIIQPsvobRZN0gwDQYJKoZIhvcNAQELBQAwSTELMA [...]"
 }

TFTP Events

Fields

  • packet: The operation code, can be “read” or “write” or “error”

  • file: The filename transported with the tftp protocol

  • mode: The mode field, can be “octet” or “mail” or “netascii” (or any combination of upper and lower case)

Example of TFTP logging:

"tftp": {
    "packet": "write",
    "file": "rfc1350.txt",
    "mode": "octet"
 }

SMB Events

Fields

  • id (integer): internal transaction id

  • dialect (string): the negotiated protocol dialect, or “unknown” if missing

  • command (string): command name. E.g. SMB2_COMMAND_CREATE or SMB1_COMMAND_WRITE_ANDX

  • status (string): status string. Can be both NT_STATUS or DOS_ERR and other variants

  • status_code (string): status code as hex string

  • session_id (integer): SMB2+ session_id. SMB1 user id.

  • tree_id (integer): Tree ID

  • filename (string): filename for CREATE and other commands.

  • disposition (string): requested disposition. E.g. FILE_OPEN, FILE_CREATE and FILE_OVERWRITE. See MSN Docs.

  • access (string): indication of how the file was opened. “normal” or “delete on close (field is subject to change)

  • created, accessed, modified, changed (integer): timestamps in seconds since unix epoch

  • size (integer): size of the requested file

  • fuid (string): SMB2+ file GUID. SMB1 FID as hex.

  • share (string): share name.

  • share_type (string): FILE, PIPE, PRINT or unknown.

  • client_dialects (array of strings): list of SMB dialects the client speaks.

  • client_guid (string): client GUID

  • server_guid (string): server GUID

  • request.native_os (string): SMB1 native OS string

  • request.native_lm (string): SMB1 native Lan Manager string

  • response.native_os (string): SMB1 native OS string

  • response.native_lm (string): SMB1 native Lan Manager string

Examples of SMB logging:

Pipe open:

"smb": {
  "id": 1,
  "dialect": "unknown",
  "command": "SMB2_COMMAND_CREATE",
  "status": "STATUS_SUCCESS",
  "status_code": "0x0",
  "session_id": 4398046511201,
  "tree_id": 1,
  "filename": "atsvc",
  "disposition": "FILE_OPEN",
  "access": "normal",
  "created": 0,
  "accessed": 0,
  "modified": 0,
  "changed": 0,
  "size": 0,
  "fuid": "0000004d-0000-0000-0005-0000ffffffff"
}

File/pipe close:

"smb": {
  "id": 15,
  "dialect": "2.10",
  "command": "SMB2_COMMAND_CLOSE",
  "status": "STATUS_SUCCESS",
  "status_code": "0x0",
  "session_id": 4398046511121,
  "tree_id": 1,
}

Tree connect (share open):

"smb": {
  "id": 3,
  "dialect": "2.10",
  "command": "SMB2_COMMAND_TREE_CONNECT",
  "status": "STATUS_SUCCESS",
  "status_code": "0x0",
  "session_id": 4398046511121,
  "tree_id": 1,
  "share": "\\\\admin-pc\\c$",
  "share_type": "FILE"
}

Dialect negotiation from SMB1 to SMB2 dialect 2.10:

"smb": {
  "id": 1,
  "dialect": "2.??",
  "command": "SMB1_COMMAND_NEGOTIATE_PROTOCOL",
  "status": "STATUS_SUCCESS",
  "status_code": "0x0",
  "session_id": 0,
  "tree_id": 0,
  "client_dialects": [
    "PC NETWORK PROGRAM 1.0",
    "LANMAN1.0",
    "Windows for Workgroups 3.1a",
    "LM1.2X002",
    "LANMAN2.1",
    "NT LM 0.12",
    "SMB 2.002",
    "SMB 2.???"
  ],
  "server_guid": "aec6e793-2b11-4019-2d95-55453a0ad2f1"
}
"smb": {
  "id": 2,
  "dialect": "2.10",
  "command": "SMB2_COMMAND_NEGOTIATE_PROTOCOL",
  "status": "STATUS_SUCCESS",
  "status_code": "0x0",
  "session_id": 0,
  "tree_id": 0,
  "client_dialects": [
    "2.02",
    "2.10"
  ],
  "client_guid": "601985d2-aad9-11e7-8494-00088bb57f27",
  "server_guid": "aec6e793-2b11-4019-2d95-55453a0ad2f1"
}

SMB1 partial SMB1_COMMAND_SESSION_SETUP_ANDX:

"request": {
  "native_os": "Unix",
  "native_lm": "Samba 3.9.0-SVN-build-11572"
},
"response": {
  "native_os": "Windows (TM) Code Name \"Longhorn\" Ultimate 5231",
  "native_lm": "Windows (TM) Code Name \"Longhorn\" Ultimate 6.0"
}

DCERPC fields

  • request (string): command. E.g. REQUEST, BIND.

  • response (string): reply. E.g. RESPONSE, BINDACK or FAULT.

  • opnum (integer): the opnum

  • call_id (integer): the call id

  • frag_cnt (integer): the number of fragments for the stub data

  • stub_data_size: total stub data size

  • interfaces (array): list of interfaces

  • interfaces.uuid (string): string representation of the UUID

  • interfaces.version (string): interface version

  • interfaces.ack_result (integer): ack result

  • interfaces.ack_reason (integer): ack reason

DCERPC REQUEST/RESPONSE:

"smb": {
  "id": 4,
  "dialect": "unknown",
  "command": "SMB2_COMMAND_IOCTL",
  "status": "STATUS_SUCCESS",
  "status_code": "0x0",
  "session_id": 4398046511201,
  "tree_id": 0,
  "dcerpc": {
    "request": "REQUEST",
    "response": "RESPONSE",
    "opnum": 0,
    "req": {
      "frag_cnt": 1,
      "stub_data_size": 136
    },
    "res": {
      "frag_cnt": 1,
      "stub_data_size": 8
    },
    "call_id": 2
  }
}

DCERPC BIND/BINDACK:

"smb": {
  "id": 53,
  "dialect": "2.10",
  "command": "SMB2_COMMAND_WRITE",
  "status": "STATUS_SUCCESS",
  "status_code": "0x0",
  "session_id": 35184439197745,
  "tree_id": 1,
  "dcerpc": {
    "request": "BIND",
    "response": "BINDACK",
    "interfaces": [
      {
        "uuid": "12345778-1234-abcd-ef00-0123456789ac",
        "version": "1.0",
        "ack_result": 2,
        "ack_reason": 0
      },
      {
        "uuid": "12345778-1234-abcd-ef00-0123456789ac",
        "version": "1.0",
        "ack_result": 0,
        "ack_reason": 0
      },
      {
        "uuid": "12345778-1234-abcd-ef00-0123456789ac",
        "version": "1.0",
        "ack_result": 3,
        "ack_reason": 0
      }
    ],
    "call_id": 2
  }

NTLMSSP fields

  • domain (string): the Windows domain.

  • user (string): the user.

  • host (string): the host.

Example:

"ntlmssp": {
  "domain": "VNET3",
  "user": "administrator",
  "host": "BLU"
}

More complete example:

"smb": {
  "id": 3,
  "dialect": "NT LM 0.12",
  "command": "SMB1_COMMAND_SESSION_SETUP_ANDX",
  "status": "STATUS_SUCCESS",
  "status_code": "0x0",
  "session_id": 2048,
  "tree_id": 0,
  "ntlmssp": {
    "domain": "VNET3",
    "user": "administrator",
    "host": "BLU"
  },
  "request": {
    "native_os": "Unix",
    "native_lm": "Samba 3.9.0-SVN-build-11572"
  },
  "response": {
    "native_os": "Windows (TM) Code Name \"Longhorn\" Ultimate 5231",
    "native_lm": "Windows (TM) Code Name \"Longhorn\" Ultimate 6.0"
  }
}

Kerberos fields

  • kerberos.realm (string): the Kerberos Realm.

  • kerberos.snames (array of strings): snames.

Example:

"smb": {
  "dialect": "2.10",
  "command": "SMB2_COMMAND_SESSION_SETUP",
  "status": "STATUS_SUCCESS",
  "status_code": "0x0",
  "session_id": 35184439197745,
  "tree_id": 0,
  "kerberos": {
    "realm": "CONTOSO.LOCAL",
    "snames": [
      "cifs",
      "DC1.contoso.local"
    ]
  }
}

SSH Events

Fields

  • proto_version: The protocol version transported with the ssh protocol (1.x, 2.x)

  • software_version: The software version used by end user

  • hassh.hash: MD5 of hassh algorithms of client or server

  • hassh.string: hassh algorithms of client or server

Hassh must be enabled in the Suricata config file (set ‘app-layer.protocols.ssh.hassh’ to ‘yes’).

Example of SSH logging:

"ssh": {
  "client": {
      "proto_version": "2.0",
      "software_version": "OpenSSH_6.7",
      "hassh": {
          "hash": "ec7378c1a92f5a8dde7e8b7a1ddf33d1",
          "string": "curve25519-sha256,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c",
      }
   },
  "server": {
      "proto_version": "2.0",
      "software_version": "OpenSSH_6.7",
      "hassh": {
          "hash": "ec7378c1a92f5a8dde7e8b7a1ddf33d1",
          "string": "curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256",
      }
   }
}

FLOW Events

Fields

  • pkts_toserver: total number of packets to server, include bypassed packets

  • pkts_toclient: total number of packets to client

  • bytes_toserver: total bytes count to server

  • bytes_toclient: total bytes count to client

  • bypassed.pkts_toserver: number of bypassed packets to server

  • bypassed.pkts_toclient: number of bypassed packets to client

  • bypassed.bytes_toserver: bypassed bytes count to server

  • bypassed.bytes_toclient: bypassed bytes count to client

  • start: date of start of the flow

  • end: date of end of flow (last seen packet)

  • age: duration of the flow

  • bypass: if the flow has been bypassed, it is set to “local” (internal bypass) or “capture”

  • state: display state of the flow (include “new”, “established”, “closed”, “bypassed”)

  • reason: mechanism that did trigger the end of the flow (include “timeout”, “forced” and “shutdown”)

  • alerted: “true” or “false” depending if an alert has been seen on flow

Example

"flow": {
  "pkts_toserver": 23,
  "pkts_toclient": 21,
  "bytes_toserver": 4884,
  "bytes_toclient": 7392,
  "bypassed": {
    "pkts_toserver": 10,
    "pkts_toclient": 8,
    "bytes_toserver": 1305,
    "bytes_toclient": 984
  },
  "start": "2019-05-28T23:32:29.025256+0200",
  "end": "2019-05-28T23:35:28.071281+0200",
  "age": 179,
  "bypass": "capture",
  "state": "bypassed",
  "reason": "timeout",
  "alerted": false
}

RDP Events

Initial negotiations between RDP client and server are stored as transactions and logged.

Each RDP record contains a per-flow incrementing “tx_id” field.

The “event_type” field indicates an RDP event subtype. Possible values:

  • initial_request

  • initial_response

  • connect_request

  • connect_response

  • tls_handshake

RDP type: Initial Request

The optional cookie field is a string identifier the RDP client has chosen to provide.

The optional flags field is a list of client directives. Possible values:

  • restricted_admin_mode_required

  • redirected_authentication_mode_required

  • correlation_info_present

RDP type: Initial Response

In the event of a standard initial response:

The protocol field is the selected protocol. Possible values:

  • rdp

  • ssl

  • hybrid

  • rds_tls

  • hybrid_ex

The optional flags field is a list of support server modes. Possible values:

  • extended_client_data

  • dynvc_gfx

  • restricted_admin

  • redirected_authentication

Alternatively, in the event of an error-indicating initial response:

There will be no “protocol” or “flags” fields.

The “error_code” field will contain the numeric code provided by the RDP server.

The “reason” field will contain a text summary of this code. Possible values:

  • ssl required by server (error code 0x1)

  • ssl not allowed by server (error code 0x2)

  • ssl cert not on server (error code 0x3)

  • inconsistent flags (error code 0x4)

  • hybrid required by server (error code 0x5)

  • ssl with user auth required by server (error code 0x6)

RDP type: Connect Request

The optional “channel” field is a list of requested data channel names.

Common channels:

  • rdpdr (device redirection)

  • cliprdr (shared clipboard)

  • rdpsnd (sound)

The optional “client” field is a sub-object that may contain the following:

  • version: RDP protocol version. Possible values are “v4”, “v5”, “v10.0”, “v10.1”, “v10.2”, “v10.3”, “v10.4”, “v10.5”, “v10.6”, “v10.7”, “unknown”.

  • desktop_width: Numeric desktop width value.

  • desktop_height: Numeric desktop height value.

  • color_depth: Numeric color depth. Possible values are 4, 8, 15, 16, 24.

  • keyboard_layout: Locale identifier name, e.g., “en-US”.

  • build: OS and SP level, e.g., “Windows XP”, “Windows 7 SP1”.

  • client_name: Client computer name.

  • keyboard_type: Possible values are “xt”, “ico”, “at”, “enhanced”, “1050”, “9140”, “jp”.

  • keyboard_subtype: Numeric code for keyboard.

  • function_keys: Number of function keys on client keyboard.

  • ime: Input method editor (IME) file name.

  • product_id: Product id string.

  • serial_number: Numeric value.

  • capabilities: List of any of the following: support_errinfo_pdf, want_32bpp_session, support_statusinfo_pdu, strong_asymmetric_keys, valid_connection_type, support_monitor_layout_pdu, support_netchar_autodetect, support_dynvc_gfx_protocol, support_dynamic_time_zone, support_heartbeat_pdu.

  • id: Client product id string.

  • connection_hint: Possible values are modem, low_broadband, satellite, high_broadband, wan, lan, autodetect.

  • physical_width: Numeric phyical width of display.

  • physical_height: Numeric physical height of display.

  • desktop_orientation: Numeric angle of orientation.

  • scale_factor: Numeric scale factor of desktop.

  • device_scale_factor: Numeric scale factor of display.

RDP type: Connect Response

With this event, the initial RDP negotiation is complete in terms of tracking and logging.

RDP type: TLS Handshake

With this event, the initial RDP negotiation is complete in terms of tracking and logging.

The session will use TLS encryption.

The “x509_serials” field is a list of observed certificate serial numbers, e.g., “16ed2aa0495f259d4f5d99edada570d1”.

Examples

RDP logging:

"rdp": {
  "tx_id": 0,
  "event_type": "initial_request",
  "cookie": "A70067"
}

"rdp": {
  "tx_id": 1,
  "event_type": "initial_response"
}

"rdp": {
  "tx_id": 2,
  "event_type": "connect_request",
  "client": {
    "version": "v5",
    "desktop_width": 1152,
    "desktop_height": 864,
    "color_depth": 15,
    "keyboard_layout": "en-US",
    "build": "Windows XP",
    "client_name": "ISD2-KM84178",
    "keyboard_type": "enhanced",
    "function_keys": 12,
    "product_id": 1,
    "capabilities": [
      "support_errinfo_pdf"
    ],
    "id": "55274-OEM-0011903-00107"
  },
  "channels": [
    "rdpdr",
    "cliprdr",
    "rdpsnd"
  ]
}

"rdp": {
  "tx_id": 3,
  "event_type": "connect_response"
}

RDP logging, with transition to TLS

"rdp": {
  "tx_id": 0,
  "event_type": "initial_request",
  "cookie": "AWAKECODI"
}

"rdp": {
  "tx_id": 1,
  "event_type": "initial_response",
  "server_supports": [
    "extended_client_data"
  ],
  "protocol": "hybrid"
}

"rdp": {
  "tx_id": 2,
  "event_type": "tls_handshake",
  "x509_serials": [
    "16ed2aa0495f259d4f5d99edada570d1"
  ]
}

RFB Events

Fields

  • server_protocol_version.major, server_protocol_version.minor: The RFB protocol version offered by the server.

  • client_protocol_version.major, client_protocol_version.minor: The RFB protocol version agreed by the client.

  • authentication.security_type: Security type agreed upon in the logged transaction, e.g. 2 is VNC auth.

  • authentication.vnc.challenge, authentication.vnc.response: Only available when security type 2 is used. Contains the challenge and response byte buffers exchanged by the server and client as hex strings.

  • authentication.security-result: Result of the authentication process (OK, FAIL or TOOMANY).

  • screen_shared: Boolean value describing whether the client requested screen sharing.

  • framebuffer: Contains metadata about the initial screen setup process. Only available when the handshake completed this far.

  • framebuffer.width, framebuffer.height: Screen size as offered by the server.

  • framebuffer.name: Desktop name as advertised by the server.

  • framebuffer.pixel_format: Pixel representation information, such as color depth. See RFC6143 (https://tools.ietf.org/html/rfc6143) for details.

Examples

Example of RFB logging, with full VNC style authentication parameters:

"rfb": {
  "server_protocol_version": {
    "major": "003",
    "minor": "007"
  },
  "client_protocol_version": {
    "major": "003",
    "minor": "007"
  },
  "authentication": {
    "security_type": 2,
    "vnc": {
      "challenge": "0805b790b58e967f2b350a0c99de3881",
      "response": "aecb26faeaaa62179636a5934bac1078"
    },
    "security-result": "OK"
  },
  "screen_shared": false,
  "framebuffer": {
    "width": 1280,
    "height": 800,
    "name": "foobar@localhost.localdomain",
    "pixel_format": {
      "bits_per_pixel": 32,
      "depth": 24,
      "big_endian": false,
      "true_color": true,
      "red_max": 255,
      "green_max": 255,
      "blue_max": 255,
      "red_shift": 16,
      "green_shift": 8,
      "blue_shift": 0
    }
  }

MQTT Events

EVE-JSON output for MQTT consists of one object per MQTT transaction, with some common and various type-specific fields.

Transactions

A single MQTT communication can consist of multiple messages that need to be exchanged between broker and client. For example, some actions at higher QoS levels (> 0) usually involve a combination of requests and acknowledgement messages that are linked by a common identifier:

  • CONNECT followed by CONNACK

  • PUBLISH followed by PUBACK (QoS 1) or PUBREC/PUBREL/PUBCOMP (QoS 2)

  • SUBSCRIBE followed by SUBACK

  • UNSUBSCRIBE followed by UNSUBACK

The MQTT parser merges individual messages into one EVE output item if they belong to one transaction. In such cases, the source and destination information (IP/port) reflect the direction of the initial request, but contain messages from both sides.

Example for a PUBLISH at QoS 2:

{
  "timestamp": "2020-05-19T18:00:39.016985+0200",
  "flow_id": 1454127794305760,
  "pcap_cnt": 65,
  "event_type": "mqtt",
  "src_ip": "0000:0000:0000:0000:0000:0000:0000:0001",
  "src_port": 60105,
  "dest_ip": "0000:0000:0000:0000:0000:0000:0000:0001",
  "dest_port": 1883,
  "proto": "TCP",
  "mqtt": {
    "publish": {
      "qos": 2,
      "retain": false,
      "dup": false,
      "topic": "house/bulbs/bulb1",
      "message_id": 3,
      "message": "OFF"
    },
    "pubrec": {
      "qos": 0,
      "retain": false,
      "dup": false,
      "message_id": 3
    },
    "pubrel": {
      "qos": 1,
      "retain": false,
      "dup": false,
      "message_id": 3
    },
    "pubcomp": {
      "qos": 0,
      "retain": false,
      "dup": false,
      "message_id": 3
    }
  }
}

Note that some message types (aka control packet types), such as PINGREQ and PINGRESP, have no type-specific data, nor do they have information that facilitate grouping into transactions. These will be logged as single items and only contain the common fields listed below.

Common fields

Common fields from the MQTT fixed header:

  • \*.qos: Quality of service level for the message, integer between 0 and 2.

  • \*.retain: Boolean value of the MQTT ‘retain’ flag.

  • \*.dup: Boolean value of the MQTT ‘dup’ (duplicate) flag.

MQTT CONNECT fields

  • connect.protocol_string: Protocol string as defined in the spec, e.g. MQTT (MQTT 3.1.1 and later) or MQIsdp (MQTT 3.1).

  • connect.protocol_version: Protocol version as defined in the specification:

    • protocol version 3: MQTT 3.1

    • protocol version 4: MQTT 3.1.1

    • protocol version 5: MQTT 5.0

  • connect.flags.username, connect.flags.password: Set to true if credentials are submitted with the connect request.

  • connect.flags.will: Set to true if a will is set.

  • connect.flags.will_retain: Set to true if the will is to be retained on the broker.

  • connect.will.clean_session: Set to true if the connection is to made with a clean session.

  • connect.client_id: Client ID string submitted my the connecting client.

  • connect.username, connect.password: User/password authentication credentials submitted with the connect request. Passwords are only logged when the corresponding configuration setting is enabled (mqtt.passwords: yes).

  • connect.will.topic: Topic to publish the will message to.

  • connect.will.message: Message to be published on connection loss.

  • connect.will.properties: (Optional, MQTT 5.0) Will properties set on this request. See 3.1.3.2 in the spec for more information on will properties.

  • connect.properties: (Optional, MQTT 5.0) CONNECT properties set on this request. See 3.1.2.11 in the spec for more information on CONNECT properties.

Example of MQTT CONNECT logging:

"connect": {
  "qos": 0,
  "retain": false,
  "dup": false,
  "protocol_string": "MQTT",
  "protocol_version": 5,
  "flags": {
    "username": true,
    "password": true,
    "will_retain": false,
    "will": true,
    "clean_session": true
  },
  "client_id": "client",
  "username": "user",
  "password": "pass",
  "will": {
    "topic": "willtopic",
    "message": "willmessage",
    "properties": {
      "content_type": "mywilltype",
      "correlation_data": "3c32aa4313b3e",
      "message_expiry_interval": 133,
      "payload_format_indicator": 144,
      "response_topic": "response_topic1",
      "userprop": "uservalue",
      "will_delay_interval": 200
    }
  },
  "properties": {
    "maximum_packet_size": 11111,
    "receive_maximum": 222,
    "session_expiry_interval": 555,
    "topic_alias_maximum": 666,
    "userprop1": "userval1",
    "userprop2": "userval2"
  }
}

MQTT CONNACK fields

  • connack.session_present: Set to true if a session is continued on connection.

  • connack.return_code: Return code/reason code for this reply. See 3.2.2.2 in the spec for more information on these codes.

  • connect.properties: (Optional, MQTT 5.0) CONNACK properties set on this request. See 3.2.2.3 in the spec for more information on CONNACK properties.

Example of MQTT CONNACK logging:

"connack": {
  "qos": 0,
  "retain": false,
  "dup": false,
  "session_present": false,
  "return_code": 0,
  "properties": {
    "topic_alias_maximum": 10
  }
}

MQTT PUBLISH fields

  • publish.topic: Topic this message is published to.

  • publish.message_id: (Only present if QOS level > 0) Message ID for this publication.

  • publish.message: Message to be published.

  • publish.properties: (Optional, MQTT 5.0) PUBLISH properties set on this request. See 3.3.2.3 in the spec for more information on PUBLISH properties.

Example of MQTT PUBLISH logging

"publish": {
  "qos": 1,
  "retain": false,
  "dup": false,
  "topic": "topic",
  "message_id": 1,
  "message": "baa baa sheep",
  "properties": {
    "content_type": "mytype",
    "correlation_data": "3c32aa4313b3e",
    "message_expiry_interval": 77,
    "payload_format_indicator": 88,
    "response_topic": "response_topic1",
    "topic_alias": 5,
    "userprop": "userval"
  }
}

MQTT PUBACK/PUBREL/PUBREC/PUBCOMP fields

  • [puback|pubrel|pubrec|pubcomp].message_id: Original message ID this message refers to.

  • [puback|pubrel|pubrec|pubcomp].reason_code: Return code/reason code for this reply. See the spec for more information on these codes.

  • [puback|pubrel|pubrec|pubcomp].properties: (Optional, MQTT 5.0) Properties set on this request. See the spec for more information on these properties.

Example of MQTT PUBACK/PUBREL/PUBREC/PUBCOMP logging:

"puback": {
  "qos": 0,
  "retain": false,
  "dup": false,
  "message_id": 1,
  "reason_code": 16
}

MQTT SUBSCRIBE fields

  • subscribe.message_id: (Only present if QOS level > 0) Message ID for this subscription.

  • subscribe.topics: Array of pairs describing the subscribed topics:

    • subscribe.topics[].topic: Topic to subscribe to.

    • subscribe.topics[].qos: QOS level to apply for when subscribing.

  • subscribe.properties: (Optional, MQTT 5.0) SUBSCRIBE properties set on this request. See 3.8.2.1 in the spec for more information on SUBSCRIBE properties.

Example of MQTT SUBSCRIBE logging

"subscribe": {
  "qos": 1,
  "retain": false,
  "dup": false,
  "message_id": 1,
  "topics": [
    {
      "topic": "topicX",
      "qos": 0
    },
    {
      "topic": "topicY",
      "qos": 0
    }
  ]
}

MQTT SUBACK fields

  • suback.message_id: Original message ID this message refers to.

  • suback.qos_granted: Array of QOS levels granted for the subscribed topics, in the order of the original request.

  • suback.properties: (Optional, MQTT 5.0) SUBACK properties set on this request. See 3.9.2.1 in the spec for more information on SUBACK properties.

Example of MQTT SUBACK logging:

"suback": {
  "qos": 0,
  "retain": false,
  "dup": false,
  "message_id": 1,
  "qos_granted": [
    0,
    0
  ]
}

MQTT UNSUBSCRIBE fields

  • unsubscribe.message_id: (Only present if QOS level > 0) Message ID for this unsubscribe action.

  • unsubscribe.topics: Array of topics to be unsubscribed from.

  • unsubscribe.properties: (Optional, MQTT 5.0) UNSUBSCRIBE properties set on this request. See 3.10.2.1 in the spec for more information on UNSUBSCRIBE properties.

Example of MQTT UNSUBSCRIBE logging

"unsubscribe": {
  "qos": 1,
  "retain": false,
  "dup": false,
  "message_id": 1,
  "topics": [
    "topicX",
    "topicY"
  ]
}

MQTT UNSUBACK fields

  • unsuback.message_id: Original message ID this message refers to.

Example of MQTT UNSUBACK logging:

"unsuback": {
  "qos": 0,
  "retain": false,
  "dup": false,
  "message_id": 1
}

MQTT AUTH fields (MQTT 5.0)

  • auth.reason_code: Return code/reason code for this message. See 3.15.2.1 in the spec for more information on these codes.

  • auth.properties: (Optional, MQTT 5.0) Properties set on this request. See 3.15.2.2 in the spec for more information on these properties.

Example of MQTT AUTH logging:

"auth": {
  "qos": 0,
  "retain": false,
  "dup": false,
  "reason_code": 16
}

MQTT DISCONNECT fields

  • auth.reason_code: (Optional) Return code/reason code for this message. See 3.14.2.1 in the spec for more information on these codes.

  • auth.properties: (Optional, MQTT 5.0) Properties set on this request. See 3.14.2.2 in the spec for more information on DISCONNECT properties.

Example of MQTT DISCONNECT logging:

"disconnect": {
  "qos": 0,
  "retain": false,
  "dup": false,
  "reason_code": 4,
  "properties": {
    "session_expiry_interval": 122,
  }
}

Truncated MQTT data

Messages exceeding the maximum message length limit (config setting app-layer.protocols.mqtt.max-msg-length) will not be parsed entirely to reduce the danger of denial of service issues. In such cases, only reduced metadata will be included in the EVE-JSON output. Furthermore, since no message ID is parsed, such messages can not be placed into transactions, hence, they will always appear as a single transaction.

These truncated events will – besides basic communication metadata – only contain the following fields:

  • truncated: Set to true if the entry is truncated.

  • skipped_length: Size of the original message.

Example of a truncated MQTT PUBLISH message (with 10000 being the maximum length):

{
  "timestamp": "2020-06-23T16:25:48.729785+0200",
  "flow_id": 1872904524326406,
  "pcap_cnt": 107,
  "event_type": "mqtt",
  "src_ip": "0000:0000:0000:0000:0000:0000:0000:0001",
  "src_port": 53335,
  "dest_ip": "0000:0000:0000:0000:0000:0000:0000:0001",
  "dest_port": 1883,
  "proto": "TCP",
  "mqtt": {
    "publish": {
      "qos": 0,
      "retain": false,
      "dup": false,
      "truncated": true,
      "skipped_length": 100011
    }

HTTP2 Events

Fields

There are the two fields “request” and “response” which can each contain the same set of fields :

  • settings: a list of settings with “name” and “value”

  • headers: a list of headers with either “name” and “value”, or “table_size_update”, or “error” if any

  • error_code: the error code from GOAWAY or RST_STREAM, which can be “NO_ERROR”

  • priority: the stream priority.

Examples

Example of HTTP2 logging, of a settings frame:

"http2": {
  "request": {
    "settings": [
      {
        "settings_id": "SETTINGSMAXCONCURRENTSTREAMS",
        "settings_value": 100
      },
      {
        "settings_id": "SETTINGSINITIALWINDOWSIZE",
        "settings_value": 65535
      }
    ]
  },
  "response": {}
}

Example of HTTP2 logging, of a request and response

"http2": {
  "request": {
    "headers": [
      {
        "name": ":authority",
        "value": "localhost:3000"
      },
      {
        "name": ":method",
        "value": "GET"
      },
      {
        "name": ":path",
        "value": "/doc/manual/html/index.html"
      },
      {
        "name": ":scheme",
        "value": "http"
      },
      {
        "name": "accept",
        "value": "*/*"
      },
      {
        "name": "accept-encoding",
        "value": "gzip, deflate"
      },
      {
        "name": "user-agent",
        "value": "nghttp2/0.5.2-DEV"
      }
    ]
  },
  "response": {
    "headers": [
      {
        "name": ":status",
        "value": "200"
      },
      {
        "name": "server",
        "value": "nghttpd nghttp2/0.5.2-DEV"
      },
      {
        "name": "content-length",
        "value": "22617"
      },
      {
        "name": "cache-control",
        "value": "max-age=3600"
      },
      {
        "name": "date",
        "value": "Sat, 02 Aug 2014 10:50:25 GMT"
      },
      {
        "name": "last-modified",
        "value": "Sat, 02 Aug 2014 07:58:59 GMT"
      }
    ]
  }
}