Keyless Signature Infrastructure Provider (ksi)
===============================================

**Signature Provider Name: ksi**

**Author:** Rainer Gerhards <rgerhards@adiscon.com>

**Supported Since:** since 8.11.0

**Description**:

Provides the ability to sign syslog messages via the GuardTime KSI 
signature services.

**Configuration Parameters**:

Signature providers are loaded by omfile, when the provider is selected
in its "sig.providerName" parameter. Parameters for the provider are
given in the omfile action instance line.

This provider creates a signature file with the same base name but the
extension ".ksisig" for each log file (both for fixed-name files as well
as dynafiles). Both files together form a set. So you need to archive
both in order to prove integrity.

-  **sig.hashFunction** <Hash Algorithm>
   The following hash algorithms are currently supported:

   -  SHA1
   -  SHA2-256
   -  RIPEMD-160
   -  SHA2-224
   -  SHA2-384
   -  SHA2-512
   -  RIPEMD-256
   -  SHA3-244
   -  SHA3-256
   -  SHA3-384
   -  SHA3-512
   -  SM3

-  **sig.aggregator.uri** <KSI Aggregator URL>
   This provides the URL of the KSI Aggregator service provided by
   guardtime and looks like this: 
	
	ksi+tcp://[ip/dnsname]:3332

-  **sig.aggregator.user** <KSI UserID>
   Set your username provided by Guardtime here. 

-  **sig.aggregator.key** <KSI Key / Password>
   Set your key provided by Guardtime here. 

-  **sig.block.sizeLimit** <nbr-records>
   The maximum number of records inside a single signature block. By
   default, there is no size limit, so the signature is only written on
   file closure. Note that a signature request typically takes between
   one and two seconds. So signing to frequently is probably not a good
   idea.

-  **sig.keepRecordHashes** <on/**off**>
   Controls if record hashes are written to the .gtsig file. This
   enhances the ability to spot the location of a signature breach, but
   costs considerable disk space (65 bytes for each log record for
   SHA2-512 hashes, for example).

-  **sig.keepTreeHashes** <on/**off**>
   Controls if tree (intermediate) hashes are written to the .gtsig
   file. This enhances the ability to spot the location of a signature
   breach, but costs considerable disk space (a bit mire than the amount
   sig.keepRecordHashes requries). Note that both Tree and Record hashes
   can be kept inside the signature file.

**See Also**


**Caveats/Known Bugs:**

-  currently none known

**Samples:**

This writes a log file with it's associated signature file. Default
parameters are used.

::

    action(type="omfile" file="/var/log/somelog" sig.provider="ksi")

In the next sample, we use the more secure SHA2-512 hash function, sign
every 10,000 records and Tree and Record hashes are kept.

::

    action(type="omfile" file="/var/log/somelog" sig.provider="ksi"
    sig.hashfunction="SHA2-512" sig.block.sizelimit="10000"
    sig.keepTreeHashes="on" sig.keepRecordHashes="on")
