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CVE-2016-2118: docs-xml: add "allow dcerpc auth level connect" defaulting to "yes"

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We sadly need to allow this for now by default.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=11616

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Günther Deschner <gd@samba.org>
This commit is contained in:
Stefan Metzmacher 2016-03-10 17:03:59 +01:00
parent 9085300e90
commit 06b038c017
3 changed files with 33 additions and 0 deletions
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29
docs-xml/smbdotconf/security/allowdcerpcauthlevelconnect.xml Normal file
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@ -0,0 +1,29 @@
<samba:parameter name="allow dcerpc auth level connect"
context="G"
type="boolean"
xmlns:samba="http://www.samba.org/samba/DTD/samba-doc">
<description>
<para>This option controls whether DCERPC services are allowed to
be used with DCERPC_AUTH_LEVEL_CONNECT, which provides authentication,
but no per message integrity nor privacy protection.</para>
<para>Some interfaces like samr, lsarpc and netlogon have a hard-coded default of
<constant>no</constant> and epmapper, mgmt and rpcecho have a hard-coded default of
<constant>yes</constant>.
</para>
<para>The behavior can be overwritten per interface name (e.g. lsarpc, netlogon, samr, srvsvc,
winreg, wkssvc ...) by using 'allow dcerpc auth level connect:interface = yes' as option.</para>
<para>This option yields precedence to the implementation specific restrictions.
E.g. the drsuapi and backupkey protocols require DCERPC_AUTH_LEVEL_PRIVACY.
The dnsserver protocol requires DCERPC_AUTH_LEVEL_INTEGRITY.
</para>
<para>Note the default will very likely change to <constant>no</constant> for Samba 4.5.</para>
</description>
<value type="default">yes</value>
<value type="example">no</value>
</samba:parameter>

2
lib/param/loadparm.c
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@ -2634,6 +2634,8 @@ struct loadparm_context *loadparm_init(TALLOC_CTX *mem_ctx)
lpcfg_do_global_parameter(lp_ctx, "RawNTLMv2Auth", "False");
lpcfg_do_global_parameter(lp_ctx, "client use spnego principal", "False");
lpcfg_do_global_parameter(lp_ctx, "allow dcerpc auth level connect", "True");
lpcfg_do_global_parameter(lp_ctx, "UnixExtensions", "True");
lpcfg_do_global_parameter(lp_ctx, "PreferredMaster", "Auto");

2
source3/param/loadparm.c
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@ -697,6 +697,8 @@ static void init_globals(struct loadparm_context *lp_ctx, bool reinit_globals)
Globals.client_ntlmv2_auth = true; /* Client should always use use NTLMv2, as we can't tell that the server supports it, but most modern servers do */
/* Note, that we will also use NTLM2 session security (which is different), if it is available */
Globals.allow_dcerpc_auth_level_connect = true; /* we need to allow this for now by default */
Globals.map_to_guest = 0; /* By Default, "Never" */
Globals.oplock_break_wait_time = 0; /* By Default, 0 msecs. */
Globals.enhanced_browsing = true;