build/verify: add verification support for signatures

Makefile

@@ -1,6 +1,7 @@
 STEPS=		base boot cdrom chroot clean core distfiles \
 		kernel nano plugins ports prefetch print rebase \
-		release rename serial sign skim test vga vm xtools
+		release rename serial sign skim test verify vga \
+		vm xtools
 .PHONY:		${STEPS}
 
 PAGER?=		less

README.md

@@ -200,15 +200,21 @@ Core packages (pristine copies) can be batch-built using:
 
     # make core-<repo_branch_or_tag>[,...]
 
-Package sets (may be signed depending on whether the key is
-found under /root) ready for web server deployment are automatically
-generated and modified by ports.sh and core.sh.
+Package sets ready for web server deployment are automatically
+generated and modified by ports.sh, plugins.sh and core.sh.
+If signing keys are available, the packages set will be signed
+twice, first embedded into repository metadata (inside) and
+then again as a flat file (outside) to ensure integrity.
 
 Signing for all sets can be redone or applied to a previous run
 that did not sign by invoking:
 
     # make sign
 
+A verification of all available set signatures is done via:
+
+    # make verify
+
 Virtual machine images come in varying disk formats and sizes.
 The default format is vmdk with 20G and 1G swap. If you want
 to change that you can manually alter the invoke using:
@@ -293,7 +299,7 @@ Should it not fit your needs, you can change the name using:
 
     # make rename-<set>[,<another_set>] VERSION=<new_name>
 
-The available targets are: base and kernel.
+The available targets are: base, kernel and package.
 
 Last but not least, in case build variables needs to be inspected,
 they can be printed selectively using:

build/verify.sh

@@ -0,0 +1,49 @@
+#!/bin/sh
+
+# Copyright (c) 2016 Franco Fichtner <franco@opnsense.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+
+set -e
+
+SELF=verify
+
+. ./common.sh && $(${SCRUB_ARGS})
+
+setup_stage ${STAGEDIR}
+setup_base ${STAGEDIR}
+setup_chroot ${STAGEDIR}
+
+extract_packages ${STAGEDIR}
+install_packages ${STAGEDIR} ${PRODUCT_PKGNAME}
+
+mkdir -p ${STAGEDIR}${SETSDIR}
+cp ${SETSDIR}/* ${STAGEDIR}${SETSDIR}
+
+for FILE in $(find ${SETSDIR} -name "*.sig"); do
+	chroot ${STAGEDIR} /bin/sh -es <<EOF
+echo ">>> Verifying ${FILE%%.sig}:"
+opnsense-verify ${FILE%%.sig}
+EOF
+done