Use the IPA API directly when adding the HTTP principal

This is the only way to force in a custom version string
so that the remote IPA server doesn't reject the request
as being newer than the server.

This also removes the need to iterate over all servers
as the IPA connection API does this automatically.

https://fedorahosted.org/ipsilon/ticket/47

Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-by: Nathan Kinder <nkinder@redhat.com>

2 files changed, 49 insertions, 30 deletions

diff --git a/Makefile b/Makefile
index 4cc215c..f39b26f 100644
--- a/Makefile
+++ b/Makefile
@@ -8,9 +8,10 @@ lint:
 	# don't show recommendations, info, comments, report
 	# W0613 - unused argument
 	# Ignore cherrypy class members as they are dynamically added
+	# Ignore IPA API class members as they are dynamically added
 	pylint -d c,r,i,W0613 -r n -f colorized \
 		   --notes= \
-		   --ignored-classes=cherrypy \
+		   --ignored-classes=cherrypy,API \
 		   ./ipsilon
 
 pep8:
diff --git a/ipsilon/helpers/ipa.py b/ipsilon/helpers/ipa.py
index 9298c08..531e9b2 100644
--- a/ipsilon/helpers/ipa.py
+++ b/ipsilon/helpers/ipa.py
@@ -79,7 +79,7 @@ class Installer(EnvHelpersInstaller):
             self.server = ipaconfig.config.get_server()
 
         except Exception, e:  # pylint: disable=broad-except
-            logger.info('IPA tools installation found: [%s]', str(e))
+            logger.info('IPA tools installation found: [%s]', e)
             if opts['ipa'] == 'yes':
                 raise Exception('No IPA installation found!')
             return
@@ -115,37 +115,55 @@ class Installer(EnvHelpersInstaller):
         princ = 'HTTP/%s@%s' % (us, self.realm)
 
         # Check we have credentials to access server (for keytab)
-        from ipapython import ipaldap
+        from ipalib import api
         from ipalib import errors as ipaerrors
 
-        for srv in self.server:
-            msg = "Testing access to server: %s" % srv
-            print >> sys.stdout, msg,
-            try:
-                server = srv
-                c = ipaldap.IPAdmin(host=server)
-                c.do_sasl_gssapi_bind()
-                del c
-                print >> sys.stdout, "... Succeeded!"
-                break
-            except ipaerrors.ACIError, e:
-                # usually this error is returned when we have no
-                # good credentials, ask the user to kinit and retry
-                print >> sys.stderr, NO_CREDS_FOR_KEYTAB
-                logger.error('Invalid credentials: [%s]', repr(e))
-                raise Exception('Invalid credentials: [%s]', str(e))
-            except Exception, e:  # pylint: disable=broad-except
-                # for other exceptions let's try to fail later
-                pass
+        api.bootstrap(context='ipsilon_installer')
+        api.finalize()
 
         try:
-            subprocess.check_output([IPA_COMMAND, 'service-add', princ],
-                                    stderr=subprocess.STDOUT)
-        except subprocess.CalledProcessError, e:
-            # hopefully this means the service already exists
-            # otherwise we'll fail later again
-            logger.info('Error trying to create HTTP service:')
-            logger.info('Cmd> %s\n%s', e.cmd, e.output)
+            api.Backend.rpcclient.connect()
+            logger.debug('Try RPC connection')
+            api.Backend.rpcclient.forward('ping')
+            print >> sys.stdout, "... Succeeded!"
+        except ipaerrors.KerberosError as e:
+            print >> sys.stderr, NO_CREDS_FOR_KEYTAB
+            logger.error('Invalid credentials: [%s]', repr(e))
+            if api.Backend.rpcclient.isconnected():
+                api.Backend.rpcclient.disconnect()
+            raise Exception('Invalid credentials: [%s]' % e)
+        except ipaerrors.PublicError as e:
+            print >> sys.stderr, "Can't connect to any IPA server"
+            logger.error(
+                'Cannot connect to the server due to generic error: %s', e)
+            if api.Backend.rpcclient.isconnected():
+                api.Backend.rpcclient.disconnect()
+            raise Exception('Unable to connect to IPA server: %s' % e)
+
+        # Specify an older version to work on nearly any master. Force is
+        # set to True so a DNS A record is not required for adding the
+        # service.
+        try:
+            api.Backend.rpcclient.forward(
+                'service_add',
+                unicode(princ),
+                force=True,
+                version=u'2.0',
+            )
+        except ipaerrors.DuplicateEntry:
+            logger.debug('Principal %s already exists' % princ)
+        except ipaerrors.NotFound as e:
+            print >> sys.stderr, "%s" % e
+            logger.error('%s' % e)
+            raise Exception('%s' % e)
+        except ipaerrors.ACIError as e:
+            print >> sys.stderr, NO_CREDS_FOR_KEYTAB
+            logger.error('Invalid credentials: [%s]', repr(e))
+            raise Exception('Invalid credentials: [%s]' % e)
+        finally:
+            server = api.Backend.rpcclient.api.env.server
+            if api.Backend.rpcclient.isconnected():
+                api.Backend.rpcclient.disconnect()
 
         try:
             msg = "Trying to fetch keytab[%s] for %s" % (
@@ -160,7 +178,7 @@ class Installer(EnvHelpersInstaller):
             print >> sys.stderr, FAILED_TO_GET_KEYTAB
             logger.info('Error trying to get HTTP keytab:')
             logger.info('Cmd> %s\n%s', e.cmd, e.output)
-            raise Exception('Missing keytab: [%s]' % str(e))
+            raise Exception('Missing keytab: [%s]' % e)
 
         # Fixup permissions so only the ipsilon user can read these files
         pw = pwd.getpwnam(HTTPD_USER)