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adding re-signing

master
brent s 4 years ago
parent
commit
a137dc395c
  1. 83
      re_sign.py
  2. 1
      verifyfeed.py

83
re_sign.py

@ -0,0 +1,83 @@ @@ -0,0 +1,83 @@
#!/usr/bin/env python3.6

# stdlib
import os
import re
# pypi
import gpg
import gpg.constants
import gpg.errors

# Re-sign all episode files that have an invalid signature.

# The GPG home
GNUPGHOME = '~/podcast/gpg'
# The key ID to use to sign/verify. Must exist in the local keyring, trusted, etc.
GPGKEY = '0x63D1CEA387C27A92E0D50AB8343C305F9109D4DC'
# The "parent" path that contains both audio files and detached sigs.
# It is assumed that the sigs for each episode file live in ../gpg/* (relative
# to the media file(s)).
# If you need to change this, check the signer class.
EPPATH = '~/podcast/releases'
FILEEXTS = ('mp3', 'ogg')

class signer(object):
def __init__(self, key_id, gpg_home = '~/.gnupg',
sig_ext = '.asc', gpg_armor = True):
os.environ['GNUPGHOME'] = os.path.abspath(os.path.expanduser(gpg_home))
self.sig_ext = sig_ext
self.gpg = gpg.Context()
# has to be an iterable
self.gpg.signers = []
self.key = self.gpg.get_key(key_id, True)
if self.key.can_sign:
self.gpg.signers.append(self.key)
self.gpg.armor = True

def chkSigValid(self, fpath, sigpath_base):
sigpath = '.'.join((sigpath_base, re.sub('^\.', '', self.sig_ext)))
with open(sigpath, 'rb') as sig, open(fpath, 'rb') as f, \
open(os.devnull, 'wb') as DEVNULL:
try:
self.gpg.verify(f, signature = sig, sink = DEVNULL,
verify = self.gpg.signers)
return(True)
except (gpg.errors.BadSignatures, gpg.errors.GPGMEError,
FileNotFoundError):
print('BAD/MISSING SIGNATURE: {0}'.format(fpath))
return(False)

def signEpFile(self, fpath, sigpath_base):
sigpath = '.'.join((sigpath_base, re.sub('^\.', '', self.sig_ext)))
with open(sigpath, 'wb') as f, open(fpath, 'rb') as s:
f.write(self.gpg.sign(s, mode = gpg.constants.SIG_MODE_DETACH)[0])
print('Signed/re-signed {0}'.format(fpath))
return()

def getEpFiles(path, exts):
print('Building list of media files; please wait...')
fpaths = []
path = os.path.abspath(os.path.expanduser(path))
for root, dirs, files in os.walk(path):
for f in files:
if f.endswith(exts):
fpaths.append(os.path.join(root, f))
return(fpaths)

def main(GPGHOME = GNUPGHOME, KEYID = GPGKEY,
EPSPATH = EPPATH, FILEEXT = FILEEXTS):
fpaths = getEpFiles(EPSPATH, FILEEXT)
sig = signer(KEYID, gpg_home = GPGHOME)
print('Verifying files (and signing if necessary)...')
for f in fpaths:
sigfilebase = os.path.abspath(
os.path.join(
os.path.dirname(f),
os.path.join('..',
'gpg',
os.path.basename(f))))
if not sig.chkSigValid(f, sigfilebase):
sig.signEpFile(f, sigfilebase)

if __name__ == '__main__':
main()

1
verifyfeed.py

@ -11,6 +11,7 @@ try: @@ -11,6 +11,7 @@ try:
from lxml import etree
except ImportError:
import xml.etree.ElementTree as etree
# TODO: GPG verification too

baseurl = 'https://sysadministrivia.com'