:tocdepth: 3

base/bif/plugins/Zeek_SSH.events.bif.zeek
=========================================
.. zeek:namespace:: GLOBAL


:Namespace: GLOBAL

Summary
~~~~~~~
Events
######
============================================================== ==================================================================
:zeek:id:`ssh1_server_host_key`: :zeek:type:`event`            During the :abbr:`SSH (Secure Shell)` key exchange, the server
                                                               supplies its public host key.
:zeek:id:`ssh2_dh_gex_init`: :zeek:type:`event`                Generated if the connection uses a Diffie-Hellman Group Exchange
                                                               key exchange method.
:zeek:id:`ssh2_dh_server_params`: :zeek:type:`event`           Generated if the connection uses a Diffie-Hellman Group Exchange
                                                               key exchange method.
:zeek:id:`ssh2_ecc_init`: :zeek:type:`event`                   The :abbr:`ECDH (Elliptic Curve Diffie-Hellman)` and
                                                               :abbr:`ECMQV (Elliptic Curve Menezes-Qu-Vanstone)` key exchange
                                                               algorithms use two ephemeral key pairs to generate a shared
                                                               secret.
:zeek:id:`ssh2_ecc_key`: :zeek:type:`event`                    The :abbr:`ECDH (Elliptic Curve Diffie-Hellman)` and
                                                               :abbr:`ECMQV (Elliptic Curve Menezes-Qu-Vanstone)` key exchange
                                                               algorithms use two ephemeral key pairs to generate a shared
                                                               secret.
:zeek:id:`ssh2_gss_error`: :zeek:type:`event`                  In the event of a GSS-API error on the server, the server MAY send
                                                               send an error message with some additional details.
:zeek:id:`ssh2_gss_init`: :zeek:type:`event`                   In the event of a GSS-API key exchange, this event is raised on
                                                               SSH_MSG_KEXGSS_INIT message.
:zeek:id:`ssh2_rsa_secret`: :zeek:type:`event`                 In the event of a GSS-API key exchange, this event is raised on
                                                               SSH_MSG_KEXRSA_PUBKEY message.
:zeek:id:`ssh2_server_host_key`: :zeek:type:`event`            During the :abbr:`SSH (Secure Shell)` key exchange, the server
                                                               supplies its public host key.
:zeek:id:`ssh_auth_attempted`: :zeek:type:`event`              This event is generated when an :abbr:`SSH (Secure Shell)`
                                                               connection was determined to have had an authentication attempt.
:zeek:id:`ssh_auth_successful`: :zeek:type:`event`             This event is generated when an :abbr:`SSH (Secure Shell)`
                                                               connection was determined to have had a successful
                                                               authentication.
:zeek:id:`ssh_capabilities`: :zeek:type:`event`                During the initial :abbr:`SSH (Secure Shell)` key exchange, each
                                                               endpoint lists the algorithms that it supports, in order of
                                                               preference.
:zeek:id:`ssh_client_version`: :zeek:type:`event`              An :abbr:`SSH (Secure Shell)` Protocol Version Exchange message
                                                               from the client.
:zeek:id:`ssh_encrypted_packet`: :zeek:type:`event`            This event is generated when an :abbr:`SSH (Secure Shell)`
                                                               encrypted packet is seen.
:zeek:id:`ssh_server_host_key`: :zeek:type:`event`             During the :abbr:`SSH (Secure Shell)` key exchange, the server
                                                               supplies its public host key.
:zeek:id:`ssh_server_host_key_fingerprint`: :zeek:type:`event` During the :abbr:`SSH (Secure Shell)` key exchange, the server
                                                               supplies its public host key.
:zeek:id:`ssh_server_pre_banner_data`: :zeek:type:`event`      SSH servers can send textual data to the client before sending
                                                               a banner.
:zeek:id:`ssh_server_version`: :zeek:type:`event`              An :abbr:`SSH (Secure Shell)` Protocol Version Exchange message
                                                               from the server.
============================================================== ==================================================================


Detailed Interface
~~~~~~~~~~~~~~~~~~
Events
######
.. zeek:id:: ssh1_server_host_key
   :source-code: base/bif/plugins/Zeek_SSH.events.bif.zeek 163 163

   :Type: :zeek:type:`event` (c: :zeek:type:`connection`, modulus: :zeek:type:`string`, exponent: :zeek:type:`string`)

   During the :abbr:`SSH (Secure Shell)` key exchange, the server
   supplies its public host key. This event is generated when the
   appropriate key exchange message is seen for SSH1.


   :param c: The connection over which the :abbr:`SSH (Secure Shell)`
      connection took place.


   :param p: The exponent for the server's public host key (note this parameter
      is truly the exponent even though named *p* and the *exponent* parameter
      will eventually replace it).


   :param e: The prime modulus for the server's public host key (note this parameter
      is truly the modulus even though named *e* and the *modulus* parameter
      will eventually replace it).


   :param modulus: The prime modulus of the server's public host key.


   :param exponent: The exponent of the server's public host key.

   .. zeek:see:: ssh_server_version ssh_client_version ssh_auth_failed
      ssh_auth_result ssh_auth_successful ssh_auth_attempted
      ssh_capabilities ssh2_server_host_key ssh1_server_host_key
      ssh_server_host_key ssh_encrypted_packet ssh2_dh_server_params
      ssh2_gss_error ssh2_ecc_key ssh2_ecc_init ssh2_dh_gex_init
      ssh2_gss_init ssh2_rsa_secret ssh_server_host_key_fingerprint

.. zeek:id:: ssh2_dh_gex_init
   :source-code: base/bif/plugins/Zeek_SSH.events.bif.zeek 342 342

   :Type: :zeek:type:`event` (c: :zeek:type:`connection`, is_orig: :zeek:type:`bool`)

   Generated if the connection uses a Diffie-Hellman Group Exchange
   key exchange method. This event contains the direction of the key
   exchange setup, which is indicated by the the SSH_MSG_KEX_DH_GEX_INIT
   message as defined in :rfc:`4419#section-3`.


   :param c: The connection.


   :param is_orig: Did this message come from the originator?

   .. zeek:see:: ssh_server_version ssh_client_version ssh_auth_failed
      ssh_auth_result ssh_auth_successful ssh_auth_attempted
      ssh_capabilities ssh2_server_host_key ssh1_server_host_key
      ssh_server_host_key ssh_encrypted_packet ssh2_dh_server_params
      ssh2_gss_error ssh2_ecc_key ssh2_ecc_init ssh2_dh_gex_init
      ssh2_gss_init ssh2_rsa_secret ssh_server_host_key_fingerprint

.. zeek:id:: ssh2_dh_server_params
   :source-code: base/bif/plugins/Zeek_SSH.events.bif.zeek 258 258

   :Type: :zeek:type:`event` (c: :zeek:type:`connection`, p: :zeek:type:`string`, q: :zeek:type:`string`)

   Generated if the connection uses a Diffie-Hellman Group Exchange
   key exchange method. This event contains the server DH parameters,
   which are sent in the SSH_MSG_KEY_DH_GEX_GROUP message as defined in
   :rfc:`4419#section-3`.


   :param c: The connection.


   :param p: The DH prime modulus.


   :param q: The DH generator.

   .. zeek:see:: ssh_server_version ssh_client_version ssh_auth_failed
      ssh_auth_result ssh_auth_successful ssh_auth_attempted
      ssh_capabilities ssh2_server_host_key ssh1_server_host_key
      ssh_server_host_key ssh_encrypted_packet ssh2_dh_server_params
      ssh2_gss_error ssh2_ecc_key ssh2_ecc_init ssh2_dh_gex_init
      ssh2_gss_init ssh2_rsa_secret ssh_server_host_key_fingerprint

.. zeek:id:: ssh2_ecc_init
   :source-code: base/bif/plugins/Zeek_SSH.events.bif.zeek 324 324

   :Type: :zeek:type:`event` (c: :zeek:type:`connection`, is_orig: :zeek:type:`bool`)

   The :abbr:`ECDH (Elliptic Curve Diffie-Hellman)` and
   :abbr:`ECMQV (Elliptic Curve Menezes-Qu-Vanstone)` key exchange
   algorithms use two ephemeral key pairs to generate a shared
   secret. This event is generated when either the SSH_MSG_KEX_ECDH_INIT
   or SSH_MSG_ECMQV_INIT message is observed. By definition, these need
   to originate from the client and not from the server.
   For more information, see:
   :rfc:`5656#section-4`.


   :param c: The connection.


   :param is_orig: Did this message come from the originator?

   .. zeek:see:: ssh_server_version ssh_client_version ssh_auth_failed
      ssh_auth_result ssh_auth_successful ssh_auth_attempted
      ssh_capabilities ssh2_server_host_key ssh1_server_host_key
      ssh_server_host_key ssh_encrypted_packet ssh2_dh_server_params
      ssh2_gss_error ssh2_ecc_key ssh2_ecc_init ssh2_dh_gex_init
      ssh2_gss_init ssh2_rsa_secret ssh_server_host_key_fingerprint

.. zeek:id:: ssh2_ecc_key
   :source-code: base/bif/plugins/Zeek_SSH.events.bif.zeek 302 302

   :Type: :zeek:type:`event` (c: :zeek:type:`connection`, is_orig: :zeek:type:`bool`, q: :zeek:type:`string`)

   The :abbr:`ECDH (Elliptic Curve Diffie-Hellman)` and
   :abbr:`ECMQV (Elliptic Curve Menezes-Qu-Vanstone)` key exchange
   algorithms use two ephemeral key pairs to generate a shared
   secret. This event is generated when either the client's or
   server's ephemeral public key is seen. For more information, see:
   :rfc:`5656#section-4`.


   :param c: The connection.


   :param is_orig: Did this message come from the originator?


   :param q: The ephemeral public key

   .. zeek:see:: ssh_server_version ssh_client_version ssh_auth_failed
      ssh_auth_result ssh_auth_successful ssh_auth_attempted
      ssh_capabilities ssh2_server_host_key ssh1_server_host_key
      ssh_server_host_key ssh_encrypted_packet ssh2_dh_server_params
      ssh2_gss_error ssh2_ecc_key ssh2_ecc_init ssh2_dh_gex_init
      ssh2_gss_init ssh2_rsa_secret ssh_server_host_key_fingerprint

.. zeek:id:: ssh2_gss_error
   :source-code: base/bif/plugins/Zeek_SSH.events.bif.zeek 280 280

   :Type: :zeek:type:`event` (c: :zeek:type:`connection`, major_status: :zeek:type:`count`, minor_status: :zeek:type:`count`, err_msg: :zeek:type:`string`)

   In the event of a GSS-API error on the server, the server MAY send
   send an error message with some additional details. This event is
   generated when such an error message is seen. For more information,
   see :rfc:`4462#section-2.1`.


   :param c: The connection.


   :param major_status: GSS-API major status code.


   :param minor_status: GSS-API minor status code.


   :param err_msg: Detailed human-readable error message

   .. zeek:see:: ssh_server_version ssh_client_version ssh_auth_failed
      ssh_auth_result ssh_auth_successful ssh_auth_attempted
      ssh_capabilities ssh2_server_host_key ssh1_server_host_key
      ssh_server_host_key ssh_encrypted_packet ssh2_dh_server_params
      ssh2_gss_error ssh2_ecc_key ssh2_ecc_init ssh2_dh_gex_init
      ssh2_gss_init ssh2_rsa_secret ssh_server_host_key_fingerprint

.. zeek:id:: ssh2_gss_init
   :source-code: base/bif/plugins/Zeek_SSH.events.bif.zeek 359 359

   :Type: :zeek:type:`event` (c: :zeek:type:`connection`, is_orig: :zeek:type:`bool`)

   In the event of a GSS-API key exchange, this event is raised on
   SSH_MSG_KEXGSS_INIT message.
   For more information see :rfc:`4462#section-2.1`.


   :param c: The connection.


   :param is_orig: Did this message come from the originator?

   .. zeek:see:: ssh_server_version ssh_client_version ssh_auth_failed
      ssh_auth_result ssh_auth_successful ssh_auth_attempted
      ssh_capabilities ssh2_server_host_key ssh1_server_host_key
      ssh_server_host_key ssh_encrypted_packet ssh2_dh_server_params
      ssh2_gss_error ssh2_ecc_key ssh2_ecc_init ssh2_dh_gex_init
      ssh2_gss_init ssh2_rsa_secret ssh_server_host_key_fingerprint

.. zeek:id:: ssh2_rsa_secret
   :source-code: base/bif/plugins/Zeek_SSH.events.bif.zeek 377 377

   :Type: :zeek:type:`event` (c: :zeek:type:`connection`, is_orig: :zeek:type:`bool`)

   In the event of a GSS-API key exchange, this event is raised on
   SSH_MSG_KEXRSA_PUBKEY message. This message is sent first by the server,
   after which the server will respond with a SSH_MSG_KEXRSA_SECRET message.
   For more information see :rfc:`4432#section-4`.


   :param c: The connection.


   :param is_orig: Did this message come from the originator?

   .. zeek:see:: ssh_server_version ssh_client_version ssh_auth_failed
      ssh_auth_result ssh_auth_successful ssh_auth_attempted
      ssh_capabilities ssh2_server_host_key ssh1_server_host_key
      ssh_server_host_key ssh_encrypted_packet ssh2_dh_server_params
      ssh2_gss_error ssh2_ecc_key ssh2_ecc_init ssh2_dh_gex_init
      ssh2_gss_init ssh2_rsa_secret ssh_server_host_key_fingerprint

.. zeek:id:: ssh2_server_host_key
   :source-code: base/bif/plugins/Zeek_SSH.events.bif.zeek 135 135

   :Type: :zeek:type:`event` (c: :zeek:type:`connection`, key: :zeek:type:`string`)

   During the :abbr:`SSH (Secure Shell)` key exchange, the server
   supplies its public host key. This event is generated when the
   appropriate key exchange message is seen for SSH2.


   :param c: The connection over which the :abbr:`SSH (Secure Shell)`
      connection took place.


   :param key: The server's public host key. Note that this is the public key
      itself, and not just the fingerprint or hash.

   .. zeek:see:: ssh_server_version ssh_client_version ssh_auth_failed
      ssh_auth_result ssh_auth_attempted ssh_capabilities
      ssh2_server_host_key ssh1_server_host_key ssh_server_host_key
      ssh_encrypted_packet ssh2_dh_server_params ssh2_gss_error
      ssh2_ecc_key ssh2_ecc_init ssh2_dh_gex_init ssh2_gss_init
      ssh2_rsa_secret ssh_server_host_key_fingerprint

.. zeek:id:: ssh_auth_attempted
   :source-code: base/bif/plugins/Zeek_SSH.events.bif.zeek 92 92

   :Type: :zeek:type:`event` (c: :zeek:type:`connection`, authenticated: :zeek:type:`bool`)

   This event is generated when an :abbr:`SSH (Secure Shell)`
   connection was determined to have had an authentication attempt.
   This determination is based on packet size analysis, and errs
   on the side of caution - that is, if there's any doubt about
   whether or not an authentication attempt occurred, this event is
   *not* raised.

   At this point in the protocol, all we can determine is whether
   or not the user is authenticated. We don't know if the particular
   attempt succeeded or failed, since some servers require multiple
   authentications (e.g. require both a password AND a pubkey), and
   could return an authentication failed message which is marked
   as a partial success.

   This event will often be raised multiple times per connection.


   :param c: The connection over which the :abbr:`SSH (Secure Shell)`
      connection took place.


   :param authenticated: This is true if the analyzer detected a
      successful connection from the authentication attempt.

   .. zeek:see:: ssh_server_version ssh_client_version ssh_auth_failed
      ssh_auth_result ssh_auth_successful ssh_auth_attempted
      ssh_capabilities ssh2_server_host_key ssh1_server_host_key
      ssh_server_host_key ssh_encrypted_packet ssh2_dh_server_params
      ssh2_gss_error ssh2_ecc_key ssh2_ecc_init ssh2_dh_gex_init
      ssh2_gss_init ssh2_rsa_secret ssh_server_host_key_fingerprint

.. zeek:id:: ssh_auth_successful
   :source-code: base/bif/plugins/Zeek_SSH.events.bif.zeek 61 61

   :Type: :zeek:type:`event` (c: :zeek:type:`connection`, auth_method_none: :zeek:type:`bool`)

   This event is generated when an :abbr:`SSH (Secure Shell)`
   connection was determined to have had a successful
   authentication. This determination is based on packet size
   analysis, and errs on the side of caution - that is, if there's any
   doubt about the authentication success, this event is *not* raised.


   :param c: The connection over which the :abbr:`SSH (Secure Shell)`
      connection took place.


   :param auth_method_none: This is true if the analyzer detected a
      successful connection before any authentication challenge. The
      :abbr:`SSH (Secure Shell)` protocol provides a mechanism for
      unauthenticated access, which some servers support.

   .. zeek:see:: ssh_server_version ssh_client_version ssh_auth_failed
      ssh_auth_result ssh_auth_successful ssh_auth_attempted
      ssh_capabilities ssh2_server_host_key ssh1_server_host_key
      ssh_server_host_key ssh_encrypted_packet ssh2_dh_server_params
      ssh2_gss_error ssh2_ecc_key ssh2_ecc_init ssh2_dh_gex_init
      ssh2_gss_init ssh2_rsa_secret ssh_server_host_key_fingerprint

.. zeek:id:: ssh_capabilities
   :source-code: base/protocols/ssh/main.zeek 289 312

   :Type: :zeek:type:`event` (c: :zeek:type:`connection`, cookie: :zeek:type:`string`, capabilities: :zeek:type:`SSH::Capabilities`)

   During the initial :abbr:`SSH (Secure Shell)` key exchange, each
   endpoint lists the algorithms that it supports, in order of
   preference. This event is generated for each endpoint, when the
   SSH_MSG_KEXINIT message is seen. See :rfc:`4253#section-7.1` for
   details.


   :param c: The connection over which the :abbr:`SSH (Secure Shell)`
      connection took place.


   :param cookie: The SSH_MSG_KEXINIT cookie - a random value generated by
      the sender.


   :param capabilities: The list of algorithms and languages that the sender
      advertises support for, in order of preference.

   .. zeek:see:: ssh_server_version ssh_client_version ssh_auth_failed
      ssh_auth_result ssh_auth_successful ssh_auth_attempted
      ssh_capabilities ssh2_server_host_key ssh1_server_host_key
      ssh_server_host_key ssh_encrypted_packet ssh2_dh_server_params
      ssh2_gss_error ssh2_ecc_key ssh2_ecc_init ssh2_dh_gex_init
      ssh2_gss_init ssh2_rsa_secret ssh_server_host_key_fingerprint

.. zeek:id:: ssh_client_version
   :source-code: base/bif/plugins/Zeek_SSH.events.bif.zeek 38 38

   :Type: :zeek:type:`event` (c: :zeek:type:`connection`, version: :zeek:type:`string`)

   An :abbr:`SSH (Secure Shell)` Protocol Version Exchange message
   from the client. This contains an identification string that's used
   for version identification. See :rfc:`4253#section-4.2` for
   details.


   :param c: The connection over which the message was sent.


   :param version: The identification string

   .. zeek:see:: ssh_server_version ssh_client_version ssh_auth_failed
      ssh_auth_result ssh_auth_successful ssh_auth_attempted
      ssh_capabilities ssh2_server_host_key ssh1_server_host_key
      ssh_server_host_key ssh_encrypted_packet ssh2_dh_server_params
      ssh2_gss_error ssh2_ecc_key ssh2_ecc_init ssh2_dh_gex_init
      ssh2_gss_init ssh2_rsa_secret ssh_server_host_key_fingerprint

.. zeek:id:: ssh_encrypted_packet
   :source-code: base/bif/plugins/Zeek_SSH.events.bif.zeek 238 238

   :Type: :zeek:type:`event` (c: :zeek:type:`connection`, orig: :zeek:type:`bool`, len: :zeek:type:`count`)

   This event is generated when an :abbr:`SSH (Secure Shell)`
   encrypted packet is seen. This event is not handled by default, but
   is provided for heuristic analysis scripts. Note that you have to set
   :zeek:id:`SSH::disable_analyzer_after_detection` to false to use this
   event. This carries a performance penalty.


   :param c: The connection over which the :abbr:`SSH (Secure Shell)`
      connection took place.


   :param orig: Whether the packet was sent by the originator of the TCP
      connection.


   :param len: The length of the :abbr:`SSH (Secure Shell)` payload, in
      bytes. Note that this ignores reassembly, as this is unknown.

   .. zeek:see:: ssh_server_version ssh_client_version ssh_auth_failed
      ssh_auth_result ssh_auth_successful ssh_auth_attempted
      ssh_capabilities ssh2_server_host_key ssh1_server_host_key
      ssh_server_host_key ssh_encrypted_packet ssh2_dh_server_params
      ssh2_gss_error ssh2_ecc_key ssh2_ecc_init ssh2_dh_gex_init
      ssh2_gss_init ssh2_rsa_secret ssh_server_host_key_fingerprint

.. zeek:id:: ssh_server_host_key
   :source-code: base/bif/plugins/Zeek_SSH.events.bif.zeek 193 193

   :Type: :zeek:type:`event` (c: :zeek:type:`connection`, hash: :zeek:type:`string`)

   During the :abbr:`SSH (Secure Shell)` key exchange, the server
   supplies its public host key. This event is generated when the
   appropriate key exchange message is seen for SSH1 or SSH2 and provides
   a fingerprint of the server's host key.


   :param c: The connection over which the :abbr:`SSH (Secure Shell)`
      connection took place.


   :param hash: an MD5 hash fingerprint associated with the server's host key.
         For SSH2, this is the hash of the "server public host key" string as
         seen on the wire in the Diffie-Hellman key exchange reply message
         (the string itself, excluding the 4-byte length associated with it),
         which is also the *key* parameter of :zeek:see:`ssh2_server_host_key`
         For SSH1, this is the hash of the combined multiprecision integer
         strings representing the RSA1 key's prime modulus and public exponent
         (concatenated in that order) as seen on the wire,
         which are also the parameters of :zeek:see:`ssh1_server_host_key`.
         In either case, the hash is the same "fingerprint" string as presented
         by other traditional tools, ``ssh``, ``ssh-keygen``, etc, and is the
         hexadecimal representation of all 16 MD5 hash bytes delimited by colons.

   .. zeek:see:: ssh_server_version ssh_client_version ssh_auth_failed
      ssh_auth_result ssh_auth_successful ssh_auth_attempted
      ssh_capabilities ssh2_server_host_key ssh1_server_host_key
      ssh_server_host_key ssh_encrypted_packet ssh2_dh_server_params
      ssh2_gss_error ssh2_ecc_key ssh2_ecc_init ssh2_dh_gex_init
      ssh2_gss_init ssh2_rsa_secret ssh_server_host_key_fingerprint

.. zeek:id:: ssh_server_host_key_fingerprint
   :source-code: base/protocols/ssh/main.zeek 352 358

   :Type: :zeek:type:`event` (c: :zeek:type:`connection`, fingerprint: :zeek:type:`string`)

   During the :abbr:`SSH (Secure Shell)` key exchange, the server
   supplies its public host key. This event is generated when the
   appropriate key exchange message is seen for SSH1 or SSH2 and provides
   a fingerprint of the server's host key.


   :param c: The connection over which the :abbr:`SSH (Secure Shell)`
      connection took place.


   :param fingerprint: A fingerprint of the host key, generated in the same fashion as
                the ``ssh-keygen -l`` command would generate it, with the hash
                used followed by a base64-encoded version of the hash of the key.

   .. zeek:see:: ssh_server_version ssh_client_version ssh_auth_failed
      ssh_auth_result ssh_auth_successful ssh_auth_attempted
      ssh_capabilities ssh2_server_host_key ssh1_server_host_key
      ssh_server_host_key ssh_encrypted_packet ssh2_dh_server_params
      ssh2_gss_error ssh2_ecc_key ssh2_ecc_init ssh2_dh_gex_init
      ssh2_gss_init ssh2_rsa_secret ssh_server_host_key

.. zeek:id:: ssh_server_pre_banner_data
   :source-code: base/bif/plugins/Zeek_SSH.events.bif.zeek 393 393

   :Type: :zeek:type:`event` (c: :zeek:type:`connection`, data: :zeek:type:`string`)

   SSH servers can send textual data to the client before sending
   a banner. The primary use case of this are error messages of TCP
   wrappers.

   As this event happens before the SSH banner is exchanged, it is
   possible that it contains data from different protocols; e.g. if
   an SSH client connects to a non-SSH-server.


   :param c: The connection.


   :param data: The pre-banner data.

   .. zeek:see:: ssh_server_version

.. zeek:id:: ssh_server_version
   :source-code: base/bif/plugins/Zeek_SSH.events.bif.zeek 20 20

   :Type: :zeek:type:`event` (c: :zeek:type:`connection`, version: :zeek:type:`string`)

   An :abbr:`SSH (Secure Shell)` Protocol Version Exchange message
   from the server. This contains an identification string that's used
   for version identification. See :rfc:`4253#section-4.2` for
   details.


   :param c: The connection over which the message was sent.


   :param version: The identification string

   .. zeek:see:: ssh_server_version ssh_client_version ssh_auth_failed
      ssh_auth_result ssh_auth_successful ssh_auth_attempted
      ssh_capabilities ssh2_server_host_key ssh1_server_host_key
      ssh_server_host_key ssh_encrypted_packet ssh2_dh_server_params
      ssh2_gss_error ssh2_ecc_key ssh2_ecc_init ssh2_dh_gex_init
      ssh2_gss_init ssh2_rsa_secret ssh_server_pre_banner_data
      ssh_server_host_key_fingerprint


