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File Name : crypto.py

# crypto.py
# Keys and signatures.
#
# Copyright (C) 2014  Red Hat, Inc.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# the GNU General Public License v.2, or (at your option) any later version.
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY expressed or implied, including the implied warranties 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.  Any Red Hat trademarks that are incorporated in the
# source code or documentation are not subject to the GNU General Public
# License and may only be used or replicated with the express permission of
# Red Hat, Inc.
#

from __future__ import print_function
from __future__ import absolute_import
from __future__ import unicode_literals
from dnf.i18n import _
import contextlib
import dnf.pycomp
import dnf.util
import dnf.yum.misc
import io
import logging
import os
import tempfile

try:
    from gpg import Context
    from gpg import Data
except ImportError:
    import gpgme

class Context(object):
        def __init__(self):
            self.__dict__["ctx"] = gpgme.Context()

def __enter__(self):
            return self

def __exit__(self, type, value, tb):
            pass

@property
        def armor(self):
            return self.ctx.armor

@armor.setter
        def armor(self, value):
            self.ctx.armor = value

def op_import(self, key_fo):
            if isinstance(key_fo, basestring):
                key_fo = io.BytesIO(key_fo)
            self.ctx.import_(key_fo)

def op_export(self, pattern, mode, keydata):
            self.ctx.export(pattern, keydata)

def __getattr__(self, name):
            return getattr(self.ctx, name)

class Data(object):
        def __init__(self):
            self.__dict__["buf"] = io.BytesIO()

def __enter__(self):
            return self

def __exit__(self, type, value, tb):
            pass

def read(self):
            return self.buf.getvalue()

def __getattr__(self, name):
            return getattr(self.buf, name)

GPG_HOME_ENV = 'GNUPGHOME'
logger = logging.getLogger('dnf')

def _extract_signing_subkey(key):
    return dnf.util.first(subkey for subkey in key.subkeys if subkey.can_sign)

def _printable_fingerprint(fpr_hex):
    segments = (fpr_hex[i:i + 4] for i in range(0, len(fpr_hex), 4))
    return " ".join(segments)

def import_repo_keys(repo):
    gpgdir = repo._pubring_dir
    known_keys = keyids_from_pubring(gpgdir)
    for keyurl in repo.gpgkey:
        for keyinfo in retrieve(keyurl, repo):
            keyid = keyinfo.id_
            if keyid in known_keys:
                logger.debug(_('repo %s: 0x%s already imported'), repo.id, keyid)
                continue
            if not repo._key_import._confirm(keyinfo):
                continue
            dnf.yum.misc.import_key_to_pubring(
                keyinfo.raw_key, keyinfo.short_id, gpgdir=gpgdir,
                make_ro_copy=False)
            logger.debug(_('repo %s: imported key 0x%s.'), repo.id, keyid)

def keyids_from_pubring(gpgdir):
    if not os.path.exists(gpgdir):
        return []

with pubring_dir(gpgdir), Context() as ctx:
        keyids = []
        for k in ctx.keylist():
            subkey = _extract_signing_subkey(k)
            if subkey is not None:
                keyids.append(subkey.keyid)
        return keyids

def log_key_import(keyinfo):
    msg = (_('Importing GPG key 0x%s:\n'
             ' Userid     : "%s"\n'
             ' Fingerprint: %s\n'
             ' From       : %s') %
           (keyinfo.short_id, keyinfo.userid,
            _printable_fingerprint(keyinfo.fingerprint),
            keyinfo.url.replace("file://", "")))
    logger.critical("%s", msg)

def log_dns_key_import(keyinfo, dns_result):
    log_key_import(keyinfo)
    if dns_result == dnf.dnssec.Validity.VALID:
        logger.critical(_('Verified using DNS record with DNSSEC signature.'))
    else:
        logger.critical(_('NOT verified using DNS record.'))

@contextlib.contextmanager
def pubring_dir(pubring_dir):
    orig = os.environ.get(GPG_HOME_ENV, None)
    os.environ[GPG_HOME_ENV] = pubring_dir
    try:
        yield
    finally:
        if orig is None:
            del os.environ[GPG_HOME_ENV]
        else:
            os.environ[GPG_HOME_ENV] = orig

def rawkey2infos(key_fo):
    pb_dir = tempfile.mkdtemp()
    keyinfos = []
    with pubring_dir(pb_dir), Context() as ctx:
        ctx.op_import(key_fo)
        for key in ctx.keylist():
            subkey = _extract_signing_subkey(key)
            if subkey is None:
                continue
            keyinfos.append(Key(key, subkey))
        ctx.armor = True
        for info in keyinfos:
            with Data() as sink:
                ctx.op_export(info.id_, 0, sink)
                sink.seek(0, os.SEEK_SET)
                info.raw_key = sink.read()
    dnf.util.rm_rf(pb_dir)
    return keyinfos

def retrieve(keyurl, repo=None):
    if keyurl.startswith('http:'):
        logger.warning(_("retrieving repo key for %s unencrypted from %s"), repo.id, keyurl)
    with dnf.util._urlopen(keyurl, repo=repo) as handle:
        keyinfos = rawkey2infos(handle)
    for keyinfo in keyinfos:
        keyinfo.url = keyurl
    return keyinfos

class Key(object):
    def __init__(self, key, subkey):
        self.id_ = subkey.keyid
        self.fingerprint = subkey.fpr
        self.raw_key = None
        self.timestamp = subkey.timestamp
        self.url = None
        self.userid = key.uids[0].uid

@property
    def short_id(self):
        rj = '0' if dnf.pycomp.PY3 else b'0'
        return self.id_[-8:].rjust(8, rj)

@property
    def rpm_id(self):
        return self.short_id.lower()

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..	dir	-	root/root	0755	2025-11-07 03:44:19
__pycache__	dir	-	root/root	0755	2025-03-13 10:32:42
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rpm	dir	-	root/root	0755	2025-03-13 10:32:42
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__init__.py	text/x-script.python	1.36 KB	root/root	0644	2021-04-12 03:26:33
base.py	text/x-script.python	114.74 KB	root/root	0644	2025-03-11 09:47:56
callback.py	text/x-script.python	3.64 KB	root/root	0644	2021-04-12 03:26:33
comps.py	text/x-script.python	24.24 KB	root/root	0644	2025-03-11 09:47:56
const.py	text/x-script.python	2.31 KB	root/root	0644	2025-03-11 09:47:56
crypto.py	text/x-script.python	5.98 KB	root/root	0644	2021-04-12 03:26:33
dnssec.py	text/x-script.python	11.06 KB	root/root	0644	2021-04-12 03:26:33
drpm.py	text/x-script.python	6.2 KB	root/root	0644	2021-04-12 03:26:33
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pycomp.py	text/x-script.python	3.52 KB	root/root	0644	2021-04-12 03:26:33
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repo.py	text/x-script.python	20.32 KB	root/root	0644	2025-03-11 09:47:56
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