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sstate: implement basic signing/validation 

To provide some element of integrity to sstate archives, allow sstate archives
to be GPG signed with a specified key (detached signature to a sidecar .sig
file), and verify the signatures when sstate archives are unpacked.

(From OE-Core rev: 237b6c51b42b0c64434dc45685e10f757ac939c2)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Ross Burton 2015-09-03 19:39:07 +01:00 committed by Richard Purdie
parent 3bafddbadf
commit e3feac122b
1 changed files with 18 additions and 1 deletions
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19
meta/classes/sstate.bbclass
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@ -54,6 +54,13 @@ EXTRA_STAGING_FIXMES ?= ""
SIGGEN_LOCKEDSIGS_CHECK_LEVEL ?= 'error'
# The GnuPG key ID and passphrase to use to sign sstate archives (or unset to
# not sign)
SSTATE_SIG_KEY ?= ""
SSTATE_SIG_PASSPHRASE ?= ""
# Whether to verify the GnUPG signatures when extracting sstate archives
SSTATE_VERIFY_SIG ?= "0"
# Specify dirs in which the shell function is executed and don't use ${B}
# as default dirs to avoid possible race about ${B} with other task.
sstate_create_package[dirs] = "${SSTATE_BUILDDIR}"
@ -298,6 +305,10 @@ def sstate_installpkg(ss, d):
d.setVar('SSTATE_INSTDIR', sstateinst)
d.setVar('SSTATE_PKG', sstatepkg)
if bb.utils.to_boolean(d.getVar("SSTATE_VERIFY_SIG", True), False):
if subprocess.call(["gpg", "--verify", sstatepkg + ".sig", sstatepkg]) != 0:
bb.warn("Cannot verify signature on sstate package %s" % sstatepkg)
for f in (d.getVar('SSTATEPREINSTFUNCS', True) or '').split() + ['sstate_unpack_package'] + (d.getVar('SSTATEPOSTUNPACKFUNCS', True) or '').split():
bb.build.exec_func(f, d)
@ -605,7 +616,8 @@ def pstaging_fetch(sstatefetch, sstatepkg, d):
# Try a fetch from the sstate mirror, if it fails just return and
# we will build the package
for srcuri in ['file://{0}'.format(sstatefetch),
'file://{0}.siginfo'.format(sstatefetch)]:
'file://{0}.siginfo'.format(sstatefetch),
'file://{0}.sig'.format(sstatefetch)]:
localdata.setVar('SRC_URI', srcuri)
try:
fetcher = bb.fetch2.Fetch([srcuri], localdata, cache=False)
@ -665,6 +677,11 @@ sstate_create_package () {
chmod 0664 $TFILE
mv -f $TFILE ${SSTATE_PKG}
if [ -n "${SSTATE_SIG_KEY}" ]; then
rm -f ${SSTATE_PKG}.sig
echo ${SSTATE_SIG_PASSPHRASE} | gpg --batch --passphrase-fd 0 --detach-sign --local-user ${SSTATE_SIG_KEY} --output ${SSTATE_PKG}.sig ${SSTATE_PKG}
fi
cd ${WORKDIR}
rm -rf ${SSTATE_BUILDDIR}
}