Stop and uninstall ipa_kpasswd on upgrade, fix dbmodules in krb5.conf

The ipa_kpasswd service was deprecated in 2.2, replaced by kadmin. On
upgrade it will be left running by the previous installation, we need
to stop it and uninstall the service.

The dbmodules section needs to reflect that we're now using the new
IPA kdb backend instead of the standard MIT ldap backend.

https://fedorahosted.org/freeipa/ticket/2341

freeipa.spec.in

@@ -440,6 +440,19 @@ if [ "$1" -ge "1" ]; then
 %endif
 fi
 
+%pre server
+# Stop ipa_kpasswd if it exists before upgrading so we don't have a
+# zombie process when we're done.
+if [ -e /usr/sbin/ipa_kpasswd ]; then
+%if 0%{?fedora} >= 16
+# Use systemd scheme
+    /bin/systemctl stop ipa_kpasswd.service >/dev/null 2>&1 || :
+%else
+# Use SystemV scheme only before F16
+    /sbin/service ipa_kpasswd stop >/dev/null 2>&1 || :
+%endif
+fi
+
 %pre server-selinux
 if [ -s /etc/selinux/config ]; then
        . %{_sysconfdir}/selinux/config

install/tools/ipa-upgradeconfig

@@ -29,6 +29,7 @@ try:
     from ipaserver.install import installutils
     from ipaserver.install import dsinstance
     from ipaserver.install import httpinstance
+    from ipaserver.install import service
     import krbV
     import re
     import os
@@ -43,6 +44,25 @@ error was:
 """ % sys.exc_value
     sys.exit(1)
 
+class KpasswdInstance(service.SimpleServiceInstance):
+    def __init__(self):
+        service.SimpleServiceInstance.__init__(self, "ipa_kpasswd")
+
+def uninstall_ipa_kpasswd():
+    """
+    We can't use the full service uninstaller because that will attempt
+    to stop and disable the service which by now doesn't exist. We just
+    want to clean up sysrestore.state to remove all references to
+    ipa_kpasswd.
+    """
+    ipa_kpasswd = KpasswdInstance()
+
+    running = ipa_kpasswd.restore_state("running")
+    enabled = not ipa_kpasswd.restore_state("enabled")
+
+    if enabled is not None and not enabled:
+        ipa_kpasswd.remove()
+
 def backup_file(filename, ext):
     """Make a backup of filename using ext as the extension. Do not overwrite
        previous backups."""
@@ -119,7 +139,7 @@ def upgrade(sub_dict, filename, template, add=False):
     if new < 0:
         print "%s not found." % template
 
-    if old < new or add:
+    if old < new or (add and old == 0):
         backup_file(filename, new)
         update_conf(sub_dict, filename, template)
         print "Upgraded %s to version %d" % (filename, new)
@@ -157,6 +177,46 @@ def upgrade_pki():
         ipautil.run(['/usr/bin/pki-setup-proxy', '-pki_instance_root=/var/lib'
                      ,'-pki_instance_name=pki-ca','-subsystem_type=ca'])
 
+def update_dbmodules(realm, filename="/etc/krb5.conf"):
+    newfile = []
+    found_dbrealm = False
+    found_realm = False
+    prefix = ''
+
+    st = os.stat(filename)
+    fd = open(filename)
+
+    lines = fd.readlines()
+    fd.close()
+
+    if '    db_library = ipadb.so\n' in lines:
+        # Already updated
+        return
+
+    for line in lines:
+        if line.startswith('[dbmodules]'):
+            found_dbrealm = True
+        if found_dbrealm and line.find(realm) > -1:
+            found_realm = True
+            prefix = '#'
+        if found_dbrealm and line.find('}') > -1 and found_realm:
+            found_realm = False
+            newfile.append('#%s' % line)
+            prefix = ''
+            continue
+      
+        newfile.append('%s%s' % (prefix, line))
+
+    # Append updated dbmodules information
+    newfile.append('  %s = {\n' % realm)
+    newfile.append('    db_library = ipadb.so\n')
+    newfile.append('  }\n')
+
+    # Write out new file
+    fd = open(filename, 'w')
+    fd.write("".join(newfile))
+    fd.close()
+
 def main():
     """
     Get some basics about the system. If getting those basics fail then
@@ -188,6 +248,8 @@ def main():
     upgrade(sub_dict, "/etc/httpd/conf.d/ipa-rewrite.conf", ipautil.SHARE_DIR + "ipa-rewrite.conf")
     upgrade(sub_dict, "/etc/httpd/conf.d/ipa-pki-proxy.conf", ipautil.SHARE_DIR + "ipa-pki-proxy.conf", add=True)
     upgrade_pki()
+    update_dbmodules(krbctx.default_realm)
+    uninstall_ipa_kpasswd()
 try:
     if __name__ == "__main__":
         sys.exit(main())