From: Volker Lendecke <vl@samba.org>
Date: Wed, 26 Aug 2009 12:56:41 +0000 (+0200)
Subject: Add a parameter to disable the automatic creation of krb5.conf files
X-Git-Tag: 3.2.11-ctdb-64^0
X-Git-Url: http://git.samba.org/?p=obnox%2Fsamba-ctdb.git;a=commitdiff_plain;h=bd991fc0f7eb98cc9ba8fcea34b46aecf1de6019

Add a parameter to disable the automatic creation of krb5.conf files

This is necessary because MIT 1.5 can't deal with certain types (Tree Root) of
transitive AD trusts. The workaround is to add a [capaths] directive to
/etc/krb5.conf, which we don't automatically put into the krb5.conf winbind
creates.

The alternative would have been something like a "krb5 conf include", but I
think if someone has to mess with /etc/krb5.conf at this level, it should be
easy to add the site-local KDCs as well.

Next alternative is to correctly figure out the [capaths] parameter for all
trusted domains, but for that I don't have the time right now. Sorry :-)
---

diff --git a/docs-xml/smbdotconf/winbind/createkrb5conf.xml b/docs-xml/smbdotconf/winbind/createkrb5conf.xml
new file mode 100644
index 0000000000..38818240c3
--- /dev/null
+++ b/docs-xml/smbdotconf/winbind/createkrb5conf.xml
@@ -0,0 +1,24 @@
+<samba:parameter name="create krb5 conf"
+	context="G"
+	type="string"
+		 advanced="1" developer="0"
+                 xmlns:samba="http://www.samba.org/samba/DTD/samba-doc">
+<description>
+
+	<para>
+	Setting this paramter to <value type="example">no</value> prevents
+	winbind from creating custom krb5.conf files. Winbind normally does
+	this because the krb5 libraries are not AD-site-aware and thus would
+	pick any domain controller out of potentially very many. Winbind
+	is site-aware and makes the krb5 libraries use a local DC by
+	creating its own krb5.conf files.
+	</para>
+	<para>
+	Preventing winbind from doing this might become necessary if you
+	have to add special options into your system-krb5.conf that winbind
+	does not see.
+	</para>
+
+</description>
+<value type="default">yes</value>
+</samba:parameter>
diff --git a/source/libads/kerberos.c b/source/libads/kerberos.c
index dd89d7c73f..8b974bc97a 100644
--- a/source/libads/kerberos.c
+++ b/source/libads/kerberos.c
@@ -839,7 +839,7 @@ bool create_local_private_krb5_conf_for_domain(const char *realm,
 						const char *sitename,
 						struct sockaddr_storage *pss)
 {
-	char *dname = talloc_asprintf(NULL, "%s/smb_krb5", lp_lockdir());
+	char *dname;
 	char *tmpname = NULL;
 	char *fname = NULL;
 	char *file_contents = NULL;
@@ -849,6 +849,11 @@ bool create_local_private_krb5_conf_for_domain(const char *realm,
 	int fd;
 	char *realm_upper = NULL;
 
+	if (!lp_create_krb5_conf()) {
+		return False;
+	}
+
+	dname = talloc_asprintf(NULL, "%s/smb_krb5", lp_lockdir());
 	if (!dname) {
 		return False;
 	}
diff --git a/source/param/loadparm.c b/source/param/loadparm.c
index d711489ec3..441fc62935 100644
--- a/source/param/loadparm.c
+++ b/source/param/loadparm.c
@@ -195,6 +195,7 @@ struct global {
 	bool bWinbindOfflineLogon;
 	bool bWinbindNormalizeNames;
 	bool bWinbindRpcOnly;
+	bool bCreateKrb5Conf;
 	char *szIdmapBackend;
 	char *szIdmapAllocBackend;
 	char *szAddShareCommand;
@@ -4445,6 +4446,15 @@ static struct parm_struct parm_table[] = {
 		.enum_list	= NULL,
 		.flags		= FLAG_ADVANCED,
 	},
+	{
+		.label		= "create krb5 conf",
+		.type		= P_BOOL,
+		.p_class	= P_GLOBAL,
+		.ptr		= &Globals.bCreateKrb5Conf,
+		.special	= NULL,
+		.enum_list	= NULL,
+		.flags		= FLAG_ADVANCED,
+	},
 
 	{NULL,  P_BOOL,  P_NONE,  NULL,  NULL,  NULL,  0}
 };
@@ -4740,6 +4750,7 @@ static void init_globals(bool first_time_only)
 #endif
 	Globals.bUnixExtensions = True;
 	Globals.bResetOnZeroVC = False;
+	Globals.bCreateKrb5Conf = true;
 
 	/* hostname lookups can be very expensive and are broken on
 	   a large number of sites (tridge) */
@@ -5061,6 +5072,7 @@ FN_GLOBAL_BOOL(lp_winbind_refresh_tickets, &Globals.bWinbindRefreshTickets)
 FN_GLOBAL_BOOL(lp_winbind_offline_logon, &Globals.bWinbindOfflineLogon)
 FN_GLOBAL_BOOL(lp_winbind_normalize_names, &Globals.bWinbindNormalizeNames)
 FN_GLOBAL_BOOL(lp_winbind_rpc_only, &Globals.bWinbindRpcOnly)
+FN_GLOBAL_BOOL(lp_create_krb5_conf, &Globals.bCreateKrb5Conf)
 
 FN_GLOBAL_CONST_STRING(lp_idmap_backend, &Globals.szIdmapBackend)
 FN_GLOBAL_STRING(lp_idmap_alloc_backend, &Globals.szIdmapAllocBackend)