samba-tool: Add a gpo command for removing VGP Symbolic Link Group Policy

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): Wed Jan 27 07:32:03 UTC 2021 on sn-devel-184

docs-xml/manpages/samba-tool.8.xml

@@ -894,6 +894,11 @@
 	<para>Adds a VGP Symbolic Link Group Policy to the sysvol</para>
 </refsect3>
 
+<refsect3>
+	<title>gpo manage symlink remove</title>
+	<para>Removes a VGP Symbolic Link Group Policy from the sysvol</para>
+</refsect3>
+
 <refsect2>
 	<title>group</title>
 	<para>Manage groups.</para>

python/samba/netcmd/gpo.py

@@ -2421,7 +2421,65 @@ samba-tool gpo manage symlink remove {31B2F340-016D-11D2-945F-00C04FB984F9} /tmp
 
     def run(self, gpo, source, target, H=None, sambaopts=None, credopts=None,
             versionopts=None):
-        pass
+        self.lp = sambaopts.get_loadparm()
+        self.creds = credopts.get_credentials(self.lp, fallback_machine=True)
+
+        # We need to know writable DC to setup SMB connection
+        if H and H.startswith('ldap://'):
+            dc_hostname = H[7:]
+            self.url = H
+        else:
+            dc_hostname = netcmd_finddc(self.lp, self.creds)
+            self.url = dc_url(self.lp, self.creds, dc=dc_hostname)
+
+        # SMB connect to DC
+        conn = smb_connection(dc_hostname,
+                              'sysvol',
+                              lp=self.lp,
+                              creds=self.creds)
+
+        realm = self.lp.get('realm')
+        vgp_dir = '\\'.join([realm.lower(), 'Policies', gpo,
+                             'MACHINE\\VGP\\VTLA\\Unix\\Symlink'])
+        vgp_xml = '\\'.join([vgp_dir, 'manifest.xml'])
+        try:
+            xml_data = ET.ElementTree(ET.fromstring(conn.loadfile(vgp_xml)))
+            policy = xml_data.getroot().find('policysetting')
+            data = policy.find('data')
+        except NTSTATUSError as e:
+            # STATUS_OBJECT_NAME_INVALID, STATUS_OBJECT_NAME_NOT_FOUND,
+            # STATUS_OBJECT_PATH_NOT_FOUND
+            if e.args[0] in [0xC0000033, 0xC0000034, 0xC000003A]:
+                raise CommandError("Cannot remove link from '%s' to '%s' "
+                    "because it does not exist" % source, target)
+            elif e.args[0] == 0xC0000022: # STATUS_ACCESS_DENIED
+                raise CommandError("The authenticated user does "
+                                   "not have sufficient privileges")
+            else:
+                raise
+
+        for file_properties in data.findall('file_properties'):
+            source_elm = file_properties.find('source')
+            target_elm = file_properties.find('target')
+            if source_elm.text == source and target_elm.text == target:
+                data.remove(file_properties)
+                break
+        else:
+            raise CommandError("Cannot remove link from '%s' to '%s' "
+                               "because it does not exist" % source, target)
+
+
+        out = BytesIO()
+        xml_data.write(out, encoding='UTF-8', xml_declaration=True)
+        out.seek(0)
+        try:
+            create_directory_hier(conn, vgp_dir)
+            conn.savefile(vgp_xml, out.read())
+        except NTSTATUSError as e:
+            if e.args[0] == 0xC0000022: # STATUS_ACCESS_DENIED
+                raise CommandError("The authenticated user does "
+                                   "not have sufficient privileges")
+            raise
 
 class cmd_symlink(SuperCommand):
     """Manage symlink Group Policy Objects"""

selftest/knownfail.d/gpo

@@ -1 +0,0 @@
-^samba.tests.samba_tool.gpo.samba.tests.samba_tool.gpo.GpoCmdTestCase.test_symlink_add