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256 lines
9.0 KiB
256 lines
9.0 KiB
From 513bd34e4523e49e742487be32a7239111486a12 Mon Sep 17 00:00:00 2001
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From: Stefan Metzmacher <metze@samba.org>
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Date: Sat, 27 Feb 2016 03:43:58 +0100
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Subject: [PATCH 1/4] CVE-2016-2115: docs-xml: add "client ipc signing" option
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BUG: https://bugzilla.samba.org/show_bug.cgi?id=11756
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Signed-off-by: Stefan Metzmacher <metze@samba.org>
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Reviewed-by: Ralph Boehme <slow@samba.org>
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---
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docs-xml/smbdotconf/security/clientipcsigning.xml | 23 +++++++++++++++++++++++
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docs-xml/smbdotconf/security/clientsigning.xml | 3 +++
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source3/include/proto.h | 1 +
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source3/param/loadparm.c | 12 ++++++++++++
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4 files changed, 39 insertions(+)
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create mode 100644 docs-xml/smbdotconf/security/clientipcsigning.xml
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--- /dev/null
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+++ b/docs-xml/smbdotconf/security/clientipcsigning.xml
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@@ -0,0 +1,23 @@
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+<samba:parameter name="client ipc signing"
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+ context="G"
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+ type="enum"
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+ enumlist="enum_smb_signing_vals"
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+ xmlns:samba="http://www.samba.org/samba/DTD/samba-doc">
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+<description>
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+ <para>This controls whether the client is allowed or required to use SMB signing for IPC$
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+ connections as DCERPC transport inside of winbind. Possible values
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+ are <emphasis>auto</emphasis>, <emphasis>mandatory</emphasis>
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+ and <emphasis>disabled</emphasis>.
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+ </para>
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+
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+ <para>When set to auto, SMB signing is offered, but not enforced and if set
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+ to disabled, SMB signing is not offered either.</para>
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+
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+ <para>Connections from winbindd to Active Directory Domain Controllers
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+ always enforce signing.</para>
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+</description>
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+
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+<related>client signing</related>
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+
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+<value type="default">mandatory</value>
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+</samba:parameter>
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--- a/docs-xml/smbdotconf/security/clientsigning.xml
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+++ b/docs-xml/smbdotconf/security/clientsigning.xml
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@@ -12,6 +12,9 @@
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<para>When set to auto, SMB signing is offered, but not enforced.
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When set to mandatory, SMB signing is required and if set
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to disabled, SMB signing is not offered either.
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+
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+ <para>IPC$ connections for DCERPC e.g. in winbindd, are handled by the
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+ <smbconfoption name="client ipc signing"/> option.</para>
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</para>
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</description>
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--- a/source3/include/proto.h
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+++ b/source3/include/proto.h
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@@ -1690,9 +1690,11 @@ int lp_winbind_cache_time(void);
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int lp_winbind_reconnect_delay(void);
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int lp_winbind_max_clients(void);
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const char **lp_winbind_nss_info(void);
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+bool lp_winbind_sealed_pipes(void);
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int lp_algorithmic_rid_base(void);
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int lp_name_cache_timeout(void);
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int lp_client_signing(void);
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+int lp_client_ipc_signing(void);
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int lp_server_signing(void);
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int lp_client_ldap_sasl_wrapping(void);
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char *lp_parm_talloc_string(int snum, const char *type, const char *option, const char *def);
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--- a/source3/param/loadparm.c
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+++ b/source3/param/loadparm.c
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@@ -215,6 +215,7 @@ struct global {
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int winbind_expand_groups;
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bool bWinbindRefreshTickets;
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bool bWinbindOfflineLogon;
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+ bool bWinbindSealedPipes;
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bool bWinbindNormalizeNames;
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bool bWinbindRpcOnly;
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bool bCreateKrb5Conf;
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@@ -366,6 +367,7 @@ struct global {
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int restrict_anonymous;
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int name_cache_timeout;
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int client_signing;
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+ int client_ipc_signing;
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int server_signing;
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int client_ldap_sasl_wrapping;
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int iUsershareMaxShares;
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@@ -2319,6 +2321,15 @@ static struct parm_struct parm_table[] =
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.flags = FLAG_ADVANCED,
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},
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{
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+ .label = "client ipc signing",
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+ .type = P_ENUM,
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+ .p_class = P_GLOBAL,
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+ .ptr = &Globals.client_ipc_signing,
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+ .special = NULL,
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+ .enum_list = enum_smb_signing_vals,
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+ .flags = FLAG_ADVANCED,
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+ },
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+ {
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.label = "server signing",
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.type = P_ENUM,
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.p_class = P_GLOBAL,
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@@ -4765,6 +4776,15 @@ static struct parm_struct parm_table[] =
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.flags = FLAG_ADVANCED,
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},
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{
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+ .label = "winbind sealed pipes",
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+ .type = P_BOOL,
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+ .p_class = P_GLOBAL,
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+ .ptr = &Globals.bWinbindSealedPipes,
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+ .special = NULL,
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+ .enum_list = NULL,
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+ .flags = FLAG_ADVANCED,
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+ },
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+ {
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.label = "winbind normalize names",
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.type = P_BOOL,
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.p_class = P_GLOBAL,
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@@ -5458,6 +5478,7 @@ static void init_globals(bool reinit_glo
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Globals.szWinbindNssInfo = str_list_make_v3(NULL, "template", NULL);
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Globals.bWinbindRefreshTickets = False;
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Globals.bWinbindOfflineLogon = False;
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+ Globals.bWinbindSealedPipes = True;
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Globals.iIdmapCacheTime = 86400 * 7; /* a week by default */
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Globals.iIdmapNegativeCacheTime = 120; /* 2 minutes by default */
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@@ -5470,6 +5491,7 @@ static void init_globals(bool reinit_glo
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Globals.bClientUseSpnego = True;
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Globals.client_signing = Auto;
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+ Globals.client_ipc_signing = Required;
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Globals.server_signing = False;
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Globals.bDeferSharingViolations = True;
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@@ -5736,6 +5758,7 @@ FN_GLOBAL_BOOL(lp_winbind_nested_groups,
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FN_GLOBAL_INTEGER(lp_winbind_expand_groups, &Globals.winbind_expand_groups)
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FN_GLOBAL_BOOL(lp_winbind_refresh_tickets, &Globals.bWinbindRefreshTickets)
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FN_GLOBAL_BOOL(lp_winbind_offline_logon, &Globals.bWinbindOfflineLogon)
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+FN_GLOBAL_BOOL(lp_winbind_sealed_pipes, &Globals.bWinbindSealedPipes)
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FN_GLOBAL_BOOL(lp_winbind_normalize_names, &Globals.bWinbindNormalizeNames)
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FN_GLOBAL_BOOL(lp_winbind_rpc_only, &Globals.bWinbindRpcOnly)
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FN_GLOBAL_BOOL(lp_create_krb5_conf, &Globals.bCreateKrb5Conf)
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@@ -6071,6 +6094,7 @@ FN_GLOBAL_LIST(lp_winbind_nss_info, &Glo
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FN_GLOBAL_INTEGER(lp_algorithmic_rid_base, &Globals.AlgorithmicRidBase)
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FN_GLOBAL_INTEGER(lp_name_cache_timeout, &Globals.name_cache_timeout)
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FN_GLOBAL_INTEGER(lp_client_signing, &Globals.client_signing)
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+FN_GLOBAL_INTEGER(lp_client_ipc_signing, &Globals.client_ipc_signing)
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FN_GLOBAL_INTEGER(lp_server_signing, &Globals.server_signing)
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FN_GLOBAL_INTEGER(lp_client_ldap_sasl_wrapping, &Globals.client_ldap_sasl_wrapping)
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@@ -9700,6 +9724,20 @@ static bool lp_load_ex(const char *pszFn
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lp_do_parameter(GLOBAL_SECTION_SNUM, "wins server", "127.0.0.1");
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}
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+ if (!lp_is_in_client()) {
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+ switch (lp_client_ipc_signing()) {
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+ case Required:
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+ lp_set_cmdline("client signing", "mandatory");
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+ break;
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+ case Auto:
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+ lp_set_cmdline("client signing", "auto");
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+ break;
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+ case False:
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+ lp_set_cmdline("client signing", "disabled");
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+ break;
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+ }
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+ }
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+
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init_iconv();
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bAllowIncludeRegistry = true;
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--- a/source3/rpc_server/spoolss/srv_spoolss_nt.c
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+++ b/source3/rpc_server/spoolss/srv_spoolss_nt.c
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@@ -2480,7 +2480,7 @@ static bool spoolss_connect_to_client(st
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"", /* username */
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"", /* domain */
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"", /* password */
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- 0, lp_client_signing());
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+ 0, False);
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if ( !NT_STATUS_IS_OK( ret ) ) {
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DEBUG(2,("spoolss_connect_to_client: connection to [%s] failed!\n",
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--- /dev/null
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+++ b/docs-xml/smbdotconf/winbind/winbindsealedpipes.xml
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@@ -0,0 +1,15 @@
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+<samba:parameter name="winbind sealed pipes"
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+ context="G"
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+ type="boolean"
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+ xmlns:samba="http://www.samba.org/samba/DTD/samba-doc">
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+<description>
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+ <para>This option controls whether any requests from winbindd to domain controllers
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+ pipe will be sealed. Disabling sealing can be useful for debugging
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+ purposes.</para>
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+
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+ <para>The behavior can be controlled per netbios domain
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+ by using 'winbind sealed pipes:NETBIOSDOMAIN = no' as option.</para>
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+</description>
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+
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+<value type="default">yes</value>
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+</samba:parameter>
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--- a/source3/winbindd/winbindd_cm.c
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+++ b/source3/winbindd/winbindd_cm.c
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@@ -2384,6 +2384,15 @@ NTSTATUS cm_connect_sam(struct winbindd_
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TALLOC_FREE(conn->samr_pipe);
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anonymous:
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+ if (lp_winbind_sealed_pipes() && (IS_DC || domain->primary)) {
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+ status = NT_STATUS_DOWNGRADE_DETECTED;
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+ DEBUG(1, ("Unwilling to make SAMR connection to domain %s "
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+ "without connection level security, "
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+ "must set 'winbind sealed pipes = false' "
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+ "to proceed: %s\n",
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+ domain->name, nt_errstr(status)));
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+ goto done;
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+ }
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/* Finally fall back to anonymous. */
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status = cli_rpc_pipe_open_noauth(conn->cli, &ndr_table_samr.syntax_id,
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@@ -2610,6 +2619,16 @@ NTSTATUS cm_connect_lsa(struct winbindd_
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anonymous:
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+ if (lp_winbind_sealed_pipes() && (IS_DC || domain->primary)) {
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+ result = NT_STATUS_DOWNGRADE_DETECTED;
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+ DEBUG(1, ("Unwilling to make LSA connection to domain %s "
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+ "without connection level security, "
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+ "must set 'winbind sealed pipes = false' "
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+ "to proceed: %s\n",
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+ domain->name, nt_errstr(result)));
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+ goto done;
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+ }
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+
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result = cli_rpc_pipe_open_noauth(conn->cli,
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&ndr_table_lsarpc.syntax_id,
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&conn->lsa_pipe);
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@@ -2749,7 +2768,18 @@ NTSTATUS cm_connect_netlogon(struct winb
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no_schannel:
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if ((lp_client_schannel() == False) ||
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- ((neg_flags & NETLOGON_NEG_SCHANNEL) == 0)) {
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+ ((neg_flags & NETLOGON_NEG_SCHANNEL) == 0)) {
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+ if (lp_winbind_sealed_pipes() && (IS_DC || domain->primary)) {
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+ result = NT_STATUS_DOWNGRADE_DETECTED;
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+ DEBUG(1, ("Unwilling to make connection to domain %s "
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+ "without connection level security, "
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+ "must set 'winbind sealed pipes = false' "
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+ "to proceed: %s\n",
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+ domain->name, nt_errstr(result)));
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+ TALLOC_FREE(netlogon_pipe);
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+ invalidate_cm_connection(conn);
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+ return result;
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+ }
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/*
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* NetSamLogonEx only works for schannel
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*/
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