Advise plugin for enabling sudo for members of the admins group

Create HBAC and a sudo rule for allowing members of the admins
group to run sudo on all enrolled hosts.

https://pagure.io/freeipa/issue/7538

Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>

ipaserver/advise/plugins/admins_sudo.py

@@ -0,0 +1,63 @@
+#
+# Copyright (C) 2018 FreeIPA Contributors see COPYING for license
+#
+
+from __future__ import absolute_import
+
+from ipalib.plugable import Registry
+from ipaserver.advise.base import Advice
+
+register = Registry()
+
+
+@register()
+class enable_admins_sudo(Advice):
+    """
+    Configures HBAC and SUDO for members of the admins group
+    """
+
+    description = ("Instructions for enabling HBAC and unauthenticated "
+                   "SUDO for members of the admins group.")
+
+    def check_ccache_not_empty(self):
+        self.log.comment('Check whether the credential cache is not empty')
+        self.log.exit_on_failed_command(
+            'klist',
+            [
+                "Credential cache is empty",
+                'Use kinit as privileged user to obtain Kerberos credentials'
+            ])
+
+    def create_hbac_rule(self):
+        self.log.comment('Create the HBAC rule for sudo')
+        self.log.exit_on_failed_command(
+            'err=$(ipa hbacrule-add --hostcat=all --desc "Allow admins '
+            'to run sudo on all hosts" admins_sudo 2>&1)',
+            ['Failed to add hbac rule: ${err}'])
+        self.log.command('ipa hbacrule-add-user --groups=admins admins_sudo')
+        self.log.command(
+            'ipa hbacrule-add-service --hbacsvcs=sudo admins_sudo'
+        )
+
+    def create_sudo_rule(self):
+        self.log.comment('Create the SUDO rule for the admins group')
+        self.log.exit_on_failed_command(
+            'err=$(ipa sudorule-add --desc "Allow admins to run any command '
+            'on any host" --hostcat=all --cmdcat=all admins_all '
+            '2>&1)',
+            ['Failed to add sudo rule: ${err}'])
+        self.log.command('ipa sudorule-add-user --groups=admins admins_all')
+
+    def get_info(self):
+        self.check_ccache_not_empty()
+        with self.log.if_branch(
+                'ipa hbacrule-show admins_sudo > /dev/null 2>&1'):
+            self.log.command('echo HBAC rule admins_sudo already exists')
+        with self.log.else_branch():
+            self.create_hbac_rule()
+
+        with self.log.if_branch(
+                'ipa sudorule-show admins_all > /dev/null 2>&1'):
+            self.log.command('echo SUDO rule admins_all already exists')
+        with self.log.else_branch():
+            self.create_sudo_rule()