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SSL Certificate Lookup

Splunk Cloud
Overview
Details
Provides sslcert_lookup, an external lookup that when given an IP or domain (works with SNI) and optionally port from an existing search, can give enrich the search by finding values from an SSL certificate like CN , SAN (Subject Alternative Names), and expiration. This can be handy for several use cases like looking for certificate expiration or discovering what site may be at an IP address.

SA-sslcert_lookup

This supporting add-on provides an external lookup called sslcert_lookup to collect the attributes of an SSL cert at a given address and port. It is built on the Splunk SDK.

Possible use-cases:
- Enrich ip addresses in a search with a certificate's common name (ssl_subject_common_name) or the certificate's subject alternative name (ssl_subject_alt_name) to gain intelligence of what might be the endpoint of the ip at that current time.
- Using makeresults or inputlookup commands, monitor a set of IPs or hostnames for expiring certs and alert
- Using the collect command to store a history of certificate changes

Version: 1.1.2

Lookup reference:

sslcert_lookup

Description

Given the input of a domain or ip address and optionally a connecting port (defaults to https 443 port if not specified), the sslcert_lookup returns various attributes of an SSL certificate.

Setup

Note this is not designed as an input (though that does not stop you from using the collect command) and is meant to only be installed on the search head (like any other app). No further setup required after install only particular SPL syntax required.

Syntax

search * | lookup sslcert_lookup dest AS <search\_field\_with\_domain\_or\_ip> [dest_port AS <search\_field\_with\_port>] [OUTPUT <specfic\_field\_list>]

Required arguments

dest field from search
Syntax: * | lookup sslcert_lookup dest AS <search\_field\_with\_domain\_or\_ip>
Description: Specify a field with a domain or ip address value.

Optional arguments

dest_port field from search
Syntax: * | lookup sslcert_lookup dest AS <search\_field\_with\_domain\_or\_ip> dest_port AS <search\_field\_with\_port>
Description: Specify a field with a port to connect to.
Default: 443

sslcert macro

Description

Simple method for running the sslcert_lookup.

Syntax

search * | `sslcert(<search\_field\_with\_domain\_or\_ip> [, <search\_field\_with\_port>])`

Required arguments

dest field from search
Syntax: * | `sslcert(<search\_field\_with\_domain\_or\_ip>)`
Description: Specify a field with a domain or ip address value.

Optional arguments

dest_port field from search
Syntax: * | `sslcert(<search\_field\_with\_domain\_or\_ip>, <search\_field\_with\_port>)`
Description: Specify a field with a port to connect to.
Default: 443

Possible Fields Returned

dest,dest_port,ssl_end_time, ssl_engine, ssl_hash, ssl_is_valid, ssl_issuer, ssl_issuer_common_name, ssl_issuer_email, ssl_issuer_locality, ssl_issuer_organization, ssl_issuer_state, ssl_issuer_street, ssl_issuer_unit, ssl_name, ssl_policies, ssl_publickey, ssl_publickey_algorithm, ssl_self_issued, ssl_self_signed, ssl_serial, ssl_session_id, ssl_signature_algorithm, ssl_start_time, ssl_subject, ssl_subject_alt_name, ssl_subject_common_name, ssl_subject_email, ssl_subject_locality, ssl_subject_organization, ssl_subject_state, ssl_subject_street, ssl_subject_unit, ssl_validity_window, ssl_version

Examples

1: Connect to domain

| makeresults | eval dest="splunk.com" | lookup sslcert_lookup dest

2: Connect to domain using macro

| makeresults | eval dest="splunk.com" | `sslcert(dest)`

3: Connect to ip

| makeresults | eval dest="8.8.8.8" | lookup sslcert_lookup dest

4: Connect to host and port

| makeresults | eval dest="mysplunkserver", dest_port=8000 | lookup sslcert_lookup dest dest_port

5: Connect to host and port using macro

| makeresults | eval dest="mysplunkserver", dest_port=8000 | `sslcert(dest, dest_port)`

6: Connect to ip and get only CN

| makeresults | eval dest="8.8.8.8" | lookup sslcert_lookup dest OUTPUT ssl_subject_common_name

7: Connect to ip and get only CN and SAN

| makeresults | eval dest="8.8.8.8" | lookup sslcert_lookup dest OUTPUT ssl_subject_common_name ssl_subject_alt_name | eval ssl_subject_alt_name = split(ssl_subject_alt_name,"|")

Release Notes

Version 1.1.2
Jan. 31, 2022

Updated splunklib from 1.6.14 to 1.6.18. Updated asn1crypto from 1.3.0 to 1.4.0.

Version 1.1.1
Dec. 15, 2020

Fixed app for Windows deployments. Updated to latest splunklib.


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