Change PKI so that attestation certs are fully compliant. (#668)

* Change PKI so that attestation certs are fully compliant.

Initially we generated the smallest certificate possible.
Unfortunately sometimes attestation certificates are
thoroughly checked and the FIDO x509v3 extensions must be present.
This PR now creates a PKI (root CA and signing CA) with corresponding
CRLs and also allows to create multiple batch certificates for the keys
instead of a single one.
The latest generated batch cert/key is automatically symlinked so that
the previous documentation still holds.

* Change openssl options to support older versions

* OSX doesn't support long options

---------

Co-authored-by: kaczmarczyck <43844792+kaczmarczyck@users.noreply.github.com>

tools/openssl/signing-ca.conf

@@ -0,0 +1,91 @@
+
+oid_section = OIDS
+
+[ default ]
+ca = signing-ca
+dir = ./crypto_data
+
+[ req ]
+default_bits = 4096
+encrypt_key = yes
+default_md = sha256
+utf8 = yes
+string_mask = utf8only
+prompt = no
+distinguished_name = ca_dn
+req_extensions = ca_reqext
+
+[ OIDS ]
+fido_attestation = 1.3.6.1.4.1.45724.2.1.1
+fido_aaguid = 1.3.6.1.4.1.45724.1.1.4
+
+[ ca_dn ]
+countryName = "US"
+organizationName = "OpenSK"
+organizationalUnitName = "Authenticator Attestation"
+commonName = "OpenSK Signing"
+
+[ ca_reqext ]
+keyUsage = critical,keyCertSign,cRLSign
+basicConstraints = critical,CA:true,pathlen:0
+subjectKeyIdentifier = hash
+
+[ ca ]
+default_ca = signing_ca
+
+[ signing_ca ]
+certificate = $dir/ca/$ca.pem
+private_key = $dir/ca/$ca/private/$ca.key
+new_certs_dir = $dir/ca/$ca
+serial = $dir/ca/$ca/db/$ca.pem.srl
+crlnumber = $dir/ca/$ca/db/$ca.pem.srl
+database = $dir/ca/$ca/db/$ca.db
+unique_subject = no
+default_days = 35064
+default_md = sha256
+policy = match_pol
+email_in_dn = no
+preserve = no
+name_opt = ca_default
+cert_opt = ca_default
+copy_extensions = copy
+x509_extensions = fido_key_ext
+default_crl_days = 7
+crl_extensions = crl_ext
+
+[ match_pol ]
+countryName = match
+organizationName = match
+organizationalUnitName = match
+commonName = supplied
+
+[ any_pol ]
+countryName = optional
+stateOrProvinceName = optional
+localityName = optional
+organizationName = optional
+organizationalUnitName = optional
+commonName = optional
+emailAddress = optional
+
+[ root_ca_ext ]
+keyUsage = critical,keyCertSign,cRLSign
+basicConstraints = critical,CA:true
+subjectKeyIdentifier = hash
+authorityKeyIdentifier = keyid:always
+
+[ signing_ca_ext ]
+keyUsage = critical,keyCertSign,cRLSign
+basicConstraints = critical,CA:true,pathlen:0
+subjectKeyIdentifier = hash
+authorityKeyIdentifier = keyid:always
+
+[ fido_key_ext ]
+keyUsage = critical,digitalSignature
+basicConstraints = CA:false
+subjectKeyIdentifier = hash
+authorityKeyIdentifier = keyid:always
+
+[ crl_ext ]
+authorityKeyIdentifier = keyid:always
+