BIND-9 PKCS#11 support

Prerequisite

The PKCS#11 support needs a PKCS#11 OpenSSL engine based on the Solaris one,
released the 2007-11-21 for OpenSSL 0.9.8g, with a bug fix (call to free)
and some improvements, including user friendly PIN management.

Compilation

"configure --with-pkcs11 ..."

PKCS#11 Libraries

Tested with Solaris one with a SCA board and with openCryptoki with the
software token.

OpenSSL Engines

With PKCS#11 support the PKCS#11 engine is statically loaded but at its
initialization it dynamically loads the PKCS#11 objects.
Even the pre commands are therefore unused they are defined with:
 SO_PATH:
   define: PKCS11_SO_PATH
   default: /usr/local/lib/engines/engine_pkcs11.so
 MODULE_PATH:
   define: PKCS11_MODULE_PATH
   default: /usr/lib/libpkcs11.so
Without PKCS#11 support, a specific OpenSSL engine can be still used
by defining ENGINE_ID at compile time.

PKCS#11 tools

The contrib/pkcs11-keygen directory contains a set of experimental tools
to handle keys stored in a Hardware Security Module at the benefit of BIND.

The patch for OpenSSL 0.9.8g is in this directory. Read its README.pkcs11
for the way to use it (these are the original notes so with the original
path, etc. Define OPENCRYPTOKI to use it with openCryptoki.)

PIN management

With the just fixed PKCS#11 OpenSSL engine, the PIN should be entered
each time it is required. With the improved engine, the PIN should be
entered the first time it is required or can be configured in the
OpenSSL configuration file (aka. openssl.cnf) by adding in it:
 - at the beginning:
	openssl_conf = openssl_def
 - at any place these sections:
	[ openssl_def ]
	engines = engine_section
	[ engine_section ]
	pkcs11 = pkcs11_section
	[ pkcs11_section ]
	PIN = put__your__pin__value__here

Note

Some names here are registered trademarks, at least Solaris is a trademark
of Sun Microsystems Inc...