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sstate: Allow validation of sstate singatures against list of keys

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Allow a user to validate sstate objects against a list of keys, instead
of just any known key in the user's keychain.

(From OE-Core rev: 52ba0c5e6e2e3d5d01dc3f01404f0ab1bb29b3b5)

Signed-off-by: Daniel McGregor <daniel.mcgregor@vecima.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Daniel McGregor 2021-10-12 22:04:56 -06:00 committed by Richard Purdie
parent 9a7bc68135
commit 652fdf8719
2 changed files with 26 additions and 6 deletions
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5
meta/classes/sstate.bbclass
View File

@ -116,6 +116,9 @@ SSTATE_SIG_KEY ?= ""
SSTATE_SIG_PASSPHRASE ?= ""
# Whether to verify the GnUPG signatures when extracting sstate archives
SSTATE_VERIFY_SIG ?= "0"
# List of signatures to consider valid.
SSTATE_VALID_SIGS ??= ""
SSTATE_VALID_SIGS[vardepvalue] = ""
SSTATE_HASHEQUIV_METHOD ?= "oe.sstatesig.OEOuthashBasic"
SSTATE_HASHEQUIV_METHOD[doc] = "The fully-qualified function used to calculate \
@ -372,7 +375,7 @@ def sstate_installpkg(ss, d):
bb.warn("No signature file for sstate package %s, skipping acceleration..." % sstatepkg)
return False
signer = get_signer(d, 'local')
if not signer.verify(sstatepkg + '.sig'):
if not signer.verify(sstatepkg + '.sig', d.getVar("SSTATE_VALID_SIGS")):
bb.warn("Cannot verify signature on sstate package %s, skipping acceleration..." % sstatepkg)
return False

27
meta/lib/oe/gpg_sign.py
View File

@ -109,16 +109,33 @@ class LocalSigner(object):
bb.fatal("Could not get gpg version: %s" % e)
def verify(self, sig_file):
def verify(self, sig_file, valid_sigs = ''):
"""Verify signature"""
cmd = self.gpg_cmd + ["--verify", "--no-permission-warning"]
cmd = self.gpg_cmd + ["--verify", "--no-permission-warning", "--status-fd", "1"]
if self.gpg_path:
cmd += ["--homedir", self.gpg_path]
cmd += [sig_file]
status = subprocess.call(cmd)
ret = False if status else True
return ret
status = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
# Valid if any key matches if unspecified
if not valid_sigs:
ret = False if status.returncode else True
return ret
import re
goodsigs = []
sigre = re.compile(r'^\[GNUPG:\] GOODSIG (\S+)\s(.*)$')
for l in status.stdout.decode("utf-8").splitlines():
s = sigre.match(l)
if s:
goodsigs += [s.group(1)]
for sig in valid_sigs.split():
if sig in goodsigs:
return True
if len(goodsigs):
bb.warn('No accepted signatures found. Good signatures found: %s.' % ' '.join(goodsigs))
return False
def get_signer(d, backend):