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# Copyright (C) 2005, 2011 Canonical Ltd
# Authors: Robert Collins <robert.collins@canonical.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""GPG signing and checking logic."""
import os
import sys
from StringIO import StringIO
from bzrlib.lazy_import import lazy_import
lazy_import(globals(), """
import errno
import subprocess
from bzrlib import (
errors,
trace,
ui,
i18n,
)
""")
#verification results
SIGNATURE_VALID = 0
SIGNATURE_KEY_MISSING = 1
SIGNATURE_NOT_VALID = 2
SIGNATURE_NOT_SIGNED = 3
class DisabledGPGStrategy(object):
"""A GPG Strategy that makes everything fail."""
def __init__(self, ignored):
"""Real strategies take a configuration."""
def sign(self, content):
raise errors.SigningFailed('Signing is disabled.')
def verify(self, content, testament):
raise errors.SignatureVerificationFailed('Signature verification is \
disabled.')
def set_acceptable_keys(self, key_patterns):
pass
class LoopbackGPGStrategy(object):
"""A GPG Strategy that acts like 'cat' - data is just passed through."""
def __init__(self, ignored):
"""Real strategies take a configuration."""
def sign(self, content):
return ("-----BEGIN PSEUDO-SIGNED CONTENT-----\n" + content +
"-----END PSEUDO-SIGNED CONTENT-----\n")
def verify(self, content, testament):
return SIGNATURE_VALID, None
def set_acceptable_keys(self, key_patterns):
patterns = key_patterns.split(",")
self.acceptable_keys = []
for pattern in patterns:
if pattern == "unknown":
pass
else:
self.acceptable_keys.append(pattern)
def _set_gpg_tty():
tty = os.environ.get('TTY')
if tty is not None:
os.environ['GPG_TTY'] = tty
trace.mutter('setting GPG_TTY=%s', tty)
else:
# This is not quite worthy of a warning, because some people
# don't need GPG_TTY to be set. But it is worthy of a big mark
# in ~/.bzr.log, so that people can debug it if it happens to them
trace.mutter('** Env var TTY empty, cannot set GPG_TTY.'
' Is TTY exported?')
class GPGStrategy(object):
"""GPG Signing and checking facilities."""
acceptable_keys = None
def _command_line(self):
return [self._config.gpg_signing_command(), '--clearsign']
def __init__(self, config):
self._config = config
def sign(self, content):
if isinstance(content, unicode):
raise errors.BzrBadParameterUnicode('content')
ui.ui_factory.clear_term()
preexec_fn = _set_gpg_tty
if sys.platform == 'win32':
# Win32 doesn't support preexec_fn, but wouldn't support TTY anyway.
preexec_fn = None
try:
process = subprocess.Popen(self._command_line(),
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
preexec_fn=preexec_fn)
try:
result = process.communicate(content)[0]
if process.returncode is None:
process.wait()
if process.returncode != 0:
raise errors.SigningFailed(self._command_line())
return result
except OSError, e:
if e.errno == errno.EPIPE:
raise errors.SigningFailed(self._command_line())
else:
raise
except ValueError:
# bad subprocess parameters, should never happen.
raise
except OSError, e:
if e.errno == errno.ENOENT:
# gpg is not installed
raise errors.SigningFailed(self._command_line())
else:
raise
def verify(self, content, testament):
"""Check content has a valid signature.
:param content: the commit signature
:param testament: the valid testament string for the commit
:return: SIGNATURE_VALID or a failed SIGNATURE_ value, key uid if valid
"""
try:
import gpgme
except ImportError, error:
raise errors.GpgmeNotInstalled(error)
context = gpgme.Context()
signature = StringIO(content)
plain_output = StringIO()
try:
result = context.verify(signature, None, plain_output)
except gpgme.GpgmeError,error:
raise errors.SignatureVerificationFailed(error[2])
if len(result) == 0:
return SIGNATURE_NOT_VALID, None
fingerprint = result[0].fpr
if self.acceptable_keys is not None:
if not fingerprint in self.acceptable_keys:
return SIGNATURE_KEY_MISSING, fingerprint[-8:]
if testament != plain_output.getvalue():
return SIGNATURE_NOT_VALID, None
if result[0].summary & gpgme.SIGSUM_VALID:
key = context.get_key(fingerprint)
name = key.uids[0].name
email = key.uids[0].email
return SIGNATURE_VALID, name + " <" + email + ">"
if result[0].summary & gpgme.SIGSUM_RED:
return SIGNATURE_NOT_VALID, None
if result[0].summary & gpgme.SIGSUM_KEY_MISSING:
return SIGNATURE_KEY_MISSING, fingerprint[-8:]
#summary isn't set if sig is valid but key is untrusted
if result[0].summary == 0 and self.acceptable_keys is not None:
if fingerprint in self.acceptable_keys:
return SIGNATURE_VALID, None
else:
return SIGNATURE_KEY_MISSING, None
raise errors.SignatureVerificationFailed("Unknown GnuPG key "\
"verification result")
def set_acceptable_keys(self, key_patterns):
try:
import gpgme
except ImportError, error:
raise errors.GpgmeNotInstalled(error)
patterns = key_patterns.split(",")
self.acceptable_keys = []
context = gpgme.Context()
for pattern in patterns:
result = context.keylist(pattern)
found_key = False
for key in result:
found_key = True
self.acceptable_keys.append(key.subkeys[0].fpr)
trace.mutter("Added acceptable key: " + key.subkeys[0].fpr)
if not found_key:
trace.note(i18n.gettext(
"No GnuPG key results for pattern: {}"
).format(pattern))
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