# onfca Makefile
#
# SPDX-FileCopyrightText: © 2022 Open Networking Foundation <support@opennetworking.org>
# SPDX-License-Identifier: Apache-2.0

# openssl onfiguration is also given in pki.cnf
#
# NOTE: This makefile makes heavy use of Automatic Variables
#   https://www.gnu.org/software/make/manual/html_node/Automatic-Variables.html
#  and order-only prerequisites
#   https://www.gnu.org/software/make/manual/html_node/Prerequisite-Types.html
#  Please review and understand this documentation before making changes

SHELL = bash -eu -o pipefail

# see bottom for help generation
.DEFAULT_GOAL := help
.PHONY: test license help

# common parameters for all options
KEY_SIZE              ?= 2048
OPENSSL_CNF           ?= pki.cnf

# base dir
BASE_DIR               ?= onf_pki

# default CA to use when verifying leaf certs, by default the IM CA
DEFAULT_CA            ?= im_ca

# root CA
ROOT_CA_NAME          ?= root_ca
ROOT_CA_PASSPHRASE    ?= "TestingRootCAPassPhrase"
ROOT_CA_SUBJECT       ?= /C=US/ST=California/L=Menlo Park/O=ONF/OU=Infra/CN=ONF Test Root CA
ROOT_EXPIRATION_DAYS  ?= 1825

# intermediate CA
IM_CA_NAME            ?= im_ca
IM_CA_PASSPHRASE      ?= "TestingIMCAPassPhrase"
IM_CA_SUBJECT         ?= /C=US/ST=California/L=Menlo Park/O=ONF/OU=Infra/CN=ONF Test IM CA
IM_EXPIRATION_DAYS    ?= 1095
IM_REVOKE_REASON      ?= CACompromise

# leaf certs
LEAF_EXPIRATION_DAYS  ?= 730
LEAF_PURPOSE          ?= server_cert_ext  # alternatively, use client_cert_ext for client certs
LEAF_SUBJECT_PARTIAL  ?= /C=US/ST=California/L=Menlo Park/O=ONF/OU=Infra/CN=
LEAF_KEYPAIR          ?= core
LEAF_SAN              ?= DNS:core.example.com,DNS:core.example.net
LEAF_REVOKE_REASON    ?= keyCompromise

# utility/validation targets
valid_server: ## Check Server Cert validity (set LEAF_KEYPAIR, DEFAULT_CA)
	openssl verify -verbose -x509_strict -show_chain \
	  -purpose sslserver \
	  -CAfile $(BASE_DIR)/$(DEFAULT_CA)/chain.pem \
	  -CRLfile $(BASE_DIR)/$(DEFAULT_CA)/ca.crl -crl_check \
	  $(BASE_DIR)/certout/$(LEAF_KEYPAIR).pem

valid_client: ## Check Client Cert validity (set LEAF_KEYPAIR, DEFAULT_CA)
	openssl verify -verbose -x509_strict -show_chain \
	  -purpose sslclient \
	  -CAfile $(BASE_DIR)/$(DEFAULT_CA)/chain.pem \
	  -CRLfile $(BASE_DIR)/$(DEFAULT_CA)/ca.crl -crl_check \
	  $(BASE_DIR)/certout/$(LEAF_KEYPAIR).pem

valid_im: ## Check IM CA validity (set IM_CA_NAME, ROOT_CA_NAME)
	openssl verify -verbose -x509_strict -purpose any \
	  -CAfile $(BASE_DIR)/$(ROOT_CA_NAME)/ca.pem \
	  -CRLfile $(BASE_DIR)/$(ROOT_CA_NAME)/ca.crl -crl_check_all \
	  $(BASE_DIR)/$(IM_CA_NAME)/ca.pem

printca: $(BASE_DIR)/$(DEFAULT_CA)/ca.pem ## Print CA Public Key (PEM) for DEFAULT_CA
	openssl x509 -in $< -text -noout

printcrl: $(BASE_DIR)/$(DEFAULT_CA)/ca.crl ## Print CRL (Revoke List) for DEFAULT_CA
	openssl crl -in $< -text -noout

printkey: ## Print KEY (Private Key) for LEAF_KEYPAIR
	openssl rsa -in $(BASE_DIR)/certout/$(LEAF_KEYPAIR).key -text -noout -check

printcsr: ## Print CSR (Sign Request) for LEAF_KEYPAIR
	openssl req -in $(BASE_DIR)/certout/$(LEAF_KEYPAIR).csr -text -noout -verify

printpem: ## Print PEM (Public Key) for LEAF_KEYPAIR
	openssl x509 -in $(BASE_DIR)/certout/$(LEAF_KEYPAIR).pem -text -noout

revoke_leaf: ## Revoke Leaf Cert (set IM_CA_NAME, LEAF_KEYPAIR, LEAF_REVOKE_REASON)
	BASE_DIR=$(BASE_DIR) CA_NAME=$(IM_CA_NAME) openssl ca \
	  -config $(OPENSSL_CNF) \
	  -passin file:$(BASE_DIR)/$(IM_CA_NAME)/private/ca_passphrase \
	  -revoke $(BASE_DIR)/certout/$(LEAF_KEYPAIR).pem \
	  -crl_reason $(LEAF_REVOKE_REASON)
	BASE_DIR=$(BASE_DIR) CA_NAME=$(IM_CA_NAME) openssl ca -gencrl \
	  -config $(OPENSSL_CNF) \
	  -passin file:$(BASE_DIR)/$(IM_CA_NAME)/private/ca_passphrase \
	  -out $(BASE_DIR)/$(IM_CA_NAME)/ca.crl

revoke_im: ## Revoke Intermediate CA Cert (set IM_CA_NAME, IM_REVOKE_REASON, ROOT_CA_NAME)
	BASE_DIR=$(BASE_DIR) CA_NAME=$(ROOT_CA_NAME) openssl ca \
	  -config $(OPENSSL_CNF) \
	  -passin file:$(BASE_DIR)/$(ROOT_CA_NAME)/private/ca_passphrase \
	  -revoke $(BASE_DIR)/$(IM_CA_NAME)/ca.pem \
	  -crl_reason $(IM_REVOKE_REASON)
	BASE_DIR=$(BASE_DIR) CA_NAME=$(ROOT_CA_NAME) openssl ca -gencrl \
	  -config $(OPENSSL_CNF) \
	  -passin file:$(BASE_DIR)/$(ROOT_CA_NAME)/private/ca_passphrase \
	  -out $(BASE_DIR)/$(ROOT_CA_NAME)/ca.crl

destroy:  ## Delete all certificates and data
	rm -rf $(BASE_DIR)

# don't delete intermediate files
.PRECIOUS: ca_passphrase $(BASE_DIR)/certout/%.csr $(BASE_DIR)/certout/%.key

# Generic CA directory creation
$(BASE_DIR)/%_ca:
	mkdir -p $@/private $@/db $@/crl/db $@/certs
	chmod 700 $@/private
	touch $@/db/ca.db
	printf "unique_subject = no\ncopy_extensions = copy\n" > $@/db/ca.db.attr
	echo 01 > $@/db/ca.srl
	echo 01 > $@/crl/db/ca.crl.srl
	touch $@/index.txt

# Root CA creation
$(BASE_DIR)/$(ROOT_CA_NAME)/private/ca_passphrase: | $(BASE_DIR)/$(ROOT_CA_NAME)
	@echo $(ROOT_CA_PASSPHRASE) > $@

$(BASE_DIR)/$(ROOT_CA_NAME)/private/ca_key.pem: | $(BASE_DIR)/$(ROOT_CA_NAME)/private/ca_passphrase
	@echo "## Creating root CA private key, $@"
	BASE_DIR=$(BASE_DIR) CA_NAME=$(ROOT_CA_NAME) openssl genrsa -aes256 \
	  -passout file:$(BASE_DIR)/$(ROOT_CA_NAME)/private/ca_passphrase \
	  -out $@ $(KEY_SIZE)

$(BASE_DIR)/$(ROOT_CA_NAME)/ca.pem: | $(BASE_DIR)/$(ROOT_CA_NAME)/private/ca_key.pem
	@echo "## Creating self-signed root CA cert: $@"
	BASE_DIR=$(BASE_DIR) CA_NAME=$(ROOT_CA_NAME) openssl req -config $(OPENSSL_CNF) \
	  -extensions root_ca_ext \
	  -new -x509 -sha256 \
	  -days $(ROOT_EXPIRATION_DAYS) \
	  -key $(@D)/private/ca_key.pem \
	  -passin file:$(BASE_DIR)/$(ROOT_CA_NAME)/private/ca_passphrase \
	  -subj "$(ROOT_CA_SUBJECT)" \
	  -out $@
	@echo "## Creating root CA revocation list: $(@D)/ca.crl"
	BASE_DIR=$(BASE_DIR) CA_NAME=$(ROOT_CA_NAME) openssl ca -gencrl \
	  -config $(OPENSSL_CNF) \
	  -passin file:$(BASE_DIR)/$(ROOT_CA_NAME)/private/ca_passphrase \
	  -out $(@D)/ca.crl

# Intermediate CA creation
$(BASE_DIR)/$(IM_CA_NAME)/private/ca_passphrase: | $(BASE_DIR)/$(IM_CA_NAME)
	@echo $(IM_CA_PASSPHRASE) > $@

$(BASE_DIR)/$(IM_CA_NAME)/private/ca_key.pem: | $(BASE_DIR)/$(IM_CA_NAME)/private/ca_passphrase
	@echo "## Creating intermediate CA private key: $@"
	BASE_DIR=$(BASE_DIR) CA_NAME=$(IM_CA_NAME) openssl genrsa -aes256 \
	  -passout file:$(@D)/ca_passphrase \
	  -out $@ $(KEY_SIZE)

$(BASE_DIR)/$(IM_CA_NAME)/private/im_ca.csr: | $(BASE_DIR)/$(IM_CA_NAME)/private/ca_key.pem
	@echo "## Creating intermediate CA signing request $@ from $<"
	BASE_DIR=$(BASE_DIR) CA_NAME=$(IM_CA_NAME) openssl req -config $(OPENSSL_CNF) \
	  -new -sha256 \
	  -key $(@D)/ca_key.pem \
	  -passin file:$(@D)/ca_passphrase \
	  -subj "$(IM_CA_SUBJECT)" \
	  -out $@

$(BASE_DIR)/$(IM_CA_NAME)/ca.pem: | $(BASE_DIR)/$(IM_CA_NAME)/private/im_ca.csr $(BASE_DIR)/$(ROOT_CA_NAME)/ca.pem
	@echo "## Signing $< with root CA key to create intermediate CA cert: $@"
	BASE_DIR=$(BASE_DIR) CA_NAME=$(ROOT_CA_NAME) openssl ca -config $(OPENSSL_CNF) \
	  -extensions im_ca_ext \
	  -notext -batch -md sha256 \
	  -days $(IM_EXPIRATION_DAYS) \
	  -passin file:$(BASE_DIR)/$(ROOT_CA_NAME)/private/ca_passphrase \
	  -in $(@D)/private/im_ca.csr \
	  -out $@
	@echo "## Creating chain with Root CA and IM CA: $@"
	  cat $@ $(BASE_DIR)/$(ROOT_CA_NAME)/ca.pem > $(@D)/chain.pem
	  openssl crl2pkcs7 -nocrl -certfile $(@D)/chain.pem | openssl pkcs7 -print_certs -noout
	@echo "## Creating IM CA revocation list: $(@D)/ca.crl"
	BASE_DIR=$(BASE_DIR) CA_NAME=$(IM_CA_NAME) openssl ca -gencrl \
	  -config $(OPENSSL_CNF) \
	  -passin file:$(BASE_DIR)/$(IM_CA_NAME)/private/ca_passphrase \
	  -out $(@D)/ca.crl

# Leaf cert creation
$(BASE_DIR)/certout:
	mkdir -p $@

$(BASE_DIR)/certout/%.key: | $(BASE_DIR)/certout
	@echo "## Creating leaf private key: $@"
	openssl genrsa -out $@ $(KEY_SIZE)

$(BASE_DIR)/certout/%.csr: | $(BASE_DIR)/certout/%.key
	@echo "## Creating signing request $@ from $<"
	BASE_DIR=$(BASE_DIR) CA_NAME=$(IM_CA_NAME) openssl req -config $(OPENSSL_CNF) \
	  -new -sha256 \
	  -key $(@D)/$(*F).key \
	  -subj "$(LEAF_SUBJECT_PARTIAL)$*" \
	  -addext "subjectAltName = $(LEAF_SAN)" \
	  -out $@

$(BASE_DIR)/certout/%.pem: | $(BASE_DIR)/certout/%.csr $(BASE_DIR)/$(IM_CA_NAME)/ca.pem
	@echo "## Signing $< with IM CA key to create signed leaf cert: $@"
	BASE_DIR=$(BASE_DIR) CA_NAME=$(IM_CA_NAME) openssl ca -config $(OPENSSL_CNF) \
	  -extensions $(LEAF_PURPOSE) \
	  -policy any_pol \
	  -notext -batch -md sha256 \
	  -days $(LEAF_EXPIRATION_DAYS) \
	  -passin file:$(BASE_DIR)/$(IM_CA_NAME)/private/ca_passphrase \
	  -in $(@D)/$(*F).csr \
	  -out $@
	@echo "## Creating bundle with IM CA and Leaf: $(basename $@)_bundle.pem"
	  cat $@ $(BASE_DIR)/$(IM_CA_NAME)/ca.pem > $(basename $@)_bundle.pem
	  openssl crl2pkcs7 -nocrl -certfile $(basename $@)_bundle.pem | openssl pkcs7 -print_certs -noout

# testing and license tasks
test: license

license: $(VENV_NAME) ## Check license with the reuse tool
	reuse --version ;\
  reuse --root . lint

help: ## Print help for each target
	@echo onfca make targets
	@echo See README.md for more detailed instructions
	@echo
	@grep '^[[:alnum:]_-]*:.* ##' $(MAKEFILE_LIST) \
	  | sort | awk 'BEGIN {FS=":.* ## "}; {printf "%-25s %s\n", $$1, $$2};'