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Merge remote-tracking branch 'origin/topic/jsiwek/gh-1264-ssh-host-key-fingerprints' into master

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* origin/topic/jsiwek/gh-1264-ssh-host-key-fingerprints:
  Simply ssh/main.zeek by using "ssh_server_host_key" for fingerprinting
  Deprecate "ssh1_server_host_key" parameters *e* and *p*
  GH-1264: Implement "ssh_server_host_key" event
This commit is contained in:
Jon Siwek 2020-11-16 11:22:00 -08:00
commit 02c0b33b54
12 changed files with 140 additions and 43 deletions
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29
scripts/base/protocols/ssh/main.zeek
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@ -111,17 +111,6 @@ export {
## ssh_server_host_key ssh_encrypted_packet ssh2_dh_server_params
## ssh2_gss_error ssh2_ecc_key
global ssh_auth_result: event(c: connection, result: bool, auth_attempts: count);
## Event that can be handled when the analyzer sees an SSH server host
## key. This abstracts :zeek:id:`ssh1_server_host_key` and
## :zeek:id:`ssh2_server_host_key`.
##
## .. zeek:see:: ssh_server_version ssh_client_version
## ssh_auth_successful ssh_auth_failed ssh_auth_result
## ssh_auth_attempted ssh_capabilities ssh2_server_host_key
## ssh1_server_host_key ssh_encrypted_packet ssh2_dh_server_params
## ssh2_gss_error ssh2_ecc_key
global ssh_server_host_key: event(c: connection, hash: string);
}
module SSH;
@ -337,24 +326,12 @@ event ssh_auth_failed(c: connection) &priority=-5
event ssh_auth_result(c, F, c$ssh$auth_attempts);
}
function generate_fingerprint(c: connection, key: string)
event ssh_server_host_key(c: connection, hash: string) &priority=5
{
if ( !c?$ssh )
if ( ! c?$ssh )
return;
local lx = str_split_indices(md5_hash(key), vector(2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30));
c$ssh$host_key = join_string_vec(lx, ":");
}
event ssh1_server_host_key(c: connection, p: string, e: string) &priority=5
{
generate_fingerprint(c, e + p);
}
event ssh2_server_host_key(c: connection, key: string) &priority=5
{
generate_fingerprint(c, key);
c$ssh$host_key = hash;
}
event protocol_confirmation(c: connection, atype: Analyzer::Tag, aid: count) &priority=20