gpo: Move Group Policy code below gp directory

Moves the Group Policy extensions and supporting
code within the existing python/samba/gp directory.
Meant to clean up the clutter that's accumulating
in python/samba.

Signed-off-by: David Mulder <dmulder@suse.com>
Reviewed-by: Jeremy Allison <jra@samba.org>

Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Tue May 31 20:15:45 UTC 2022 on sn-devel-184

python/samba/gp/vgp_files_ext.py

@@ -0,0 +1,139 @@
+# vgp_files_ext samba gpo policy
+# Copyright (C) David Mulder <dmulder@suse.com> 2020
+#
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+
+import os, pwd, grp
+from samba.gp.gpclass import gp_xml_ext, check_safe_path
+from tempfile import NamedTemporaryFile
+from shutil import copyfile, move
+from hashlib import blake2b
+from samba.gp.util.logging import log
+
+def calc_mode(entry):
+    mode = 0o000
+    for permissions in entry.findall('permissions'):
+        ptype = permissions.get('type')
+        if ptype == 'user':
+            if permissions.find('read') is not None:
+                mode |= 0o400
+            if permissions.find('write') is not None:
+                mode |= 0o200
+            if permissions.find('execute') is not None:
+                mode |= 0o100
+        elif ptype == 'group':
+            if permissions.find('read') is not None:
+                mode |= 0o040
+            if permissions.find('write') is not None:
+                mode |= 0o020
+            if permissions.find('execute') is not None:
+                mode |= 0o010
+        elif ptype == 'other':
+            if permissions.find('read') is not None:
+                mode |= 0o004
+            if permissions.find('write') is not None:
+                mode |= 0o002
+            if permissions.find('execute') is not None:
+                mode |= 0o001
+    return mode
+
+def stat_from_mode(mode):
+    stat = '-'
+    for i in range(6, -1, -3):
+        mask = {0o4: 'r', 0o2: 'w', 0o1: 'x'}
+        for x in mask.keys():
+            if mode & (x << i):
+                stat += mask[x]
+            else:
+                stat += '-'
+    return stat
+
+class vgp_files_ext(gp_xml_ext):
+    def __str__(self):
+        return 'VGP/Unix Settings/Files'
+
+    def process_group_policy(self, deleted_gpo_list, changed_gpo_list):
+        for guid, settings in deleted_gpo_list:
+            self.gp_db.set_guid(guid)
+            if str(self) in settings:
+                for attribute, _ in settings[str(self)].items():
+                    if os.path.exists(attribute):
+                        os.unlink(attribute)
+                    self.gp_db.delete(str(self), attribute)
+            self.gp_db.commit()
+
+        for gpo in changed_gpo_list:
+            if gpo.file_sys_path:
+                self.gp_db.set_guid(gpo.name)
+                xml = 'MACHINE/VGP/VTLA/Unix/Files/manifest.xml'
+                path = os.path.join(gpo.file_sys_path, xml)
+                xml_conf = self.parse(path)
+                if not xml_conf:
+                    continue
+                policy = xml_conf.find('policysetting')
+                data = policy.find('data')
+                for entry in data.findall('file_properties'):
+                    local_path = self.lp.cache_path('gpo_cache')
+                    source = entry.find('source').text
+                    source_file = os.path.join(local_path,
+                        os.path.dirname(check_safe_path(path)).upper(),
+                                        source.upper())
+                    if not os.path.exists(source_file):
+                        log.warn('Source file does not exist', source_file)
+                        continue
+                    source_hash = \
+                        blake2b(open(source_file, 'rb').read()).hexdigest()
+                    target = entry.find('target').text
+                    user = entry.find('user').text
+                    group = entry.find('group').text
+                    mode = calc_mode(entry)
+                    value = '%s:%s:%s:%d' % (source_hash, user, group, mode)
+                    old_val = self.gp_db.retrieve(str(self), target)
+                    if old_val == value:
+                        continue
+                    if os.path.exists(target):
+                        log.warn('Target file already exists', target)
+                        continue
+                    with NamedTemporaryFile(dir=os.path.dirname(target),
+                                            delete=False) as f:
+                        copyfile(source_file, f.name)
+                        os.chown(f.name, pwd.getpwnam(user).pw_uid,
+                                 grp.getgrnam(group).gr_gid)
+                        os.chmod(f.name, mode)
+                        move(f.name, target)
+                    self.gp_db.store(str(self), target, value)
+                    self.gp_db.commit()
+
+    def rsop(self, gpo):
+        output = {}
+        xml = 'MACHINE/VGP/VTLA/Unix/Files/manifest.xml'
+        if gpo.file_sys_path:
+            path = os.path.join(gpo.file_sys_path, xml)
+            xml_conf = self.parse(path)
+            if not xml_conf:
+                return output
+            policy = xml_conf.find('policysetting')
+            data = policy.find('data')
+            for entry in data.findall('file_properties'):
+                source = entry.find('source').text
+                target = entry.find('target').text
+                user = entry.find('user').text
+                group = entry.find('group').text
+                mode = calc_mode(entry)
+                p = '%s\t%s\t%s\t%s -> %s' % \
+                    (stat_from_mode(mode), user, group, target, source)
+                if str(self) not in output.keys():
+                    output[str(self)] = []
+                output[str(self)].append(p)
+        return output