OpenWrt – Rev 4
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From ee105156fa151ebfd34b8febc2928e144b3b7b0e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?G=C3=BCnther=20Deschner?= <gd@samba.org>
Date: Sat, 26 Sep 2015 01:29:10 +0200
Subject: [PATCH 01/15] CVE-2016-2111: s3:rpc_server/netlogon: always go
through netr_creds_server_step_check()
The ensures we apply the "server schannel = yes" restrictions.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=11749
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Guenther Deschner <gd@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
---
source3/rpc_server/netlogon/srv_netlog_nt.c | 24 ++++++++++++++----------
1 file changed, 14 insertions(+), 10 deletions(-)
--- a/source3/rpc_server/netlogon/srv_netlog_nt.c
+++ b/source3/rpc_server/netlogon/srv_netlog_nt.c
@@ -1508,6 +1508,7 @@ static NTSTATUS _netr_LogonSamLogon_base
case NetlogonNetworkTransitiveInformation:
{
const char *wksname = nt_workstation;
+ const char *workgroup = lp_workgroup();
status = make_auth_context_fixed(talloc_tos(), &auth_context,
logon->network->challenge);
@@ -1532,6 +1533,14 @@ static NTSTATUS _netr_LogonSamLogon_base
logon->network->nt.length)) {
status = NT_STATUS_NO_MEMORY;
}
+
+ if (NT_STATUS_IS_OK(status)) {
+ status = NTLMv2_RESPONSE_verify_netlogon_creds(
+ user_info->client.account_name,
+ user_info->client.domain_name,
+ user_info->password.response.nt,
+ creds, workgroup);
+ }
break;
}
case NetlogonInteractiveInformation:
@@ -1636,6 +1645,14 @@ static NTSTATUS _netr_LogonSamLogon_base
r->out.validation->sam3);
break;
case 6:
+ /* Only allow this if the pipe is protected. */
+ if (p->auth.auth_level < DCERPC_AUTH_LEVEL_PRIVACY) {
+ DEBUG(0,("netr_Validation6: client %s not using privacy for netlogon\n",
+ get_remote_machine_name()));
+ status = NT_STATUS_INVALID_PARAMETER;
+ break;
+ }
+
status = serverinfo_to_SamInfo6(server_info, pipe_session_key, 16,
r->out.validation->sam6);
break;
@@ -2271,11 +2288,13 @@ NTSTATUS _netr_GetForestTrustInformation
/* TODO: check server name */
- status = schannel_check_creds_state(p->mem_ctx, lp_private_dir(),
- r->in.computer_name,
- r->in.credential,
- r->out.return_authenticator,
- &creds);
+ become_root();
+ status = netr_creds_server_step_check(p, p->mem_ctx,
+ r->in.computer_name,
+ r->in.credential,
+ r->out.return_authenticator,
+ &creds);
+ unbecome_root();
if (!NT_STATUS_IS_OK(status)) {
return status;
}
@@ -2371,11 +2390,13 @@ NTSTATUS _netr_ServerGetTrustInfo(struct
/* TODO: check server name */
- status = schannel_check_creds_state(p->mem_ctx, lp_private_dir(),
- r->in.computer_name,
- r->in.credential,
- r->out.return_authenticator,
- &creds);
+ become_root();
+ status = netr_creds_server_step_check(p, p->mem_ctx,
+ r->in.computer_name,
+ r->in.credential,
+ r->out.return_authenticator,
+ &creds);
+ unbecome_root();
if (!NT_STATUS_IS_OK(status)) {
return status;
}
--- a/source4/torture/rpc/samba3rpc.c
+++ b/source4/torture/rpc/samba3rpc.c
@@ -1122,8 +1122,8 @@ static bool schan(struct torture_context
generate_random_buffer(chal.data, chal.length);
names_blob = NTLMv2_generate_names_blob(
mem_ctx,
- cli_credentials_get_workstation(user_creds),
- cli_credentials_get_domain(user_creds));
+ cli_credentials_get_workstation(wks_creds),
+ cli_credentials_get_domain(wks_creds));
status = cli_credentials_get_ntlm_response(
user_creds, mem_ctx, &flags, chal, names_blob,
&lm_resp, &nt_resp, NULL, NULL);
--- a/libcli/auth/proto.h
+++ b/libcli/auth/proto.h
@@ -139,6 +139,11 @@ bool SMBNTLMv2encrypt(TALLOC_CTX *mem_ct
const DATA_BLOB *names_blob,
DATA_BLOB *lm_response, DATA_BLOB *nt_response,
DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key) ;
+NTSTATUS NTLMv2_RESPONSE_verify_netlogon_creds(const char *account_name,
+ const char *account_domain,
+ const DATA_BLOB response,
+ const struct netlogon_creds_CredentialState *creds,
+ const char *workgroup);
/***********************************************************
encode a password buffer with a unicode password. The buffer
--- a/libcli/auth/smbencrypt.c
+++ b/libcli/auth/smbencrypt.c
@@ -26,7 +26,7 @@
#include "../libcli/auth/msrpc_parse.h"
#include "../lib/crypto/crypto.h"
#include "../libcli/auth/libcli_auth.h"
-#include "../librpc/gen_ndr/ntlmssp.h"
+#include "../librpc/gen_ndr/ndr_ntlmssp.h"
void SMBencrypt_hash(const uint8_t lm_hash[16], const uint8_t *c8, uint8_t p24[24])
{
@@ -522,6 +522,146 @@ bool SMBNTLMv2encrypt(TALLOC_CTX *mem_ct
lm_response, nt_response, lm_session_key, user_session_key);
}
+NTSTATUS NTLMv2_RESPONSE_verify_netlogon_creds(const char *account_name,
+ const char *account_domain,
+ const DATA_BLOB response,
+ const struct netlogon_creds_CredentialState *creds,
+ const char *workgroup)
+{
+ TALLOC_CTX *frame = NULL;
+ /* RespType + HiRespType */
+ static const char *magic = "\x01\x01";
+ int cmp;
+ struct NTLMv2_RESPONSE v2_resp;
+ enum ndr_err_code err;
+ const struct AV_PAIR *av_nb_cn = NULL;
+ const struct AV_PAIR *av_nb_dn = NULL;
+
+ if (response.length < 48) {
+ /*
+ * NTLMv2_RESPONSE has at least 48 bytes.
+ */
+ return NT_STATUS_OK;
+ }
+
+ cmp = memcmp(response.data + 16, magic, 2);
+ if (cmp != 0) {
+ /*
+ * It doesn't look like a valid NTLMv2_RESPONSE
+ */
+ return NT_STATUS_OK;
+ }
+
+ frame = talloc_stackframe();
+
+ err = ndr_pull_struct_blob(&response, frame, &v2_resp,
+ (ndr_pull_flags_fn_t)ndr_pull_NTLMv2_RESPONSE);
+ if (!NDR_ERR_CODE_IS_SUCCESS(err)) {
+ NTSTATUS status;
+ status = ndr_map_error2ntstatus(err);
+ DEBUG(2,("Failed to parse NTLMv2_RESPONSE "
+ "length %u - %s - %s\n",
+ (unsigned)response.length,
+ ndr_map_error2string(err),
+ nt_errstr(status)));
+ dump_data(2, response.data, response.length);
+ TALLOC_FREE(frame);
+ return status;
+ }
+
+ if (DEBUGLVL(10)) {
+ NDR_PRINT_DEBUG(NTLMv2_RESPONSE, &v2_resp);
+ }
+
+ /*
+ * Make sure the netbios computer name in the
+ * NTLMv2_RESPONSE matches the computer name
+ * in the secure channel credentials for workstation
+ * trusts.
+ *
+ * And the netbios domain name matches our
+ * workgroup.
+ *
+ * This prevents workstations from requesting
+ * the session key of NTLMSSP sessions of clients
+ * to other hosts.
+ */
+ if (creds->secure_channel_type == SEC_CHAN_WKSTA) {
+ av_nb_cn = ndr_ntlmssp_find_av(&v2_resp.Challenge.AvPairs,
+ MsvAvNbComputerName);
+ av_nb_dn = ndr_ntlmssp_find_av(&v2_resp.Challenge.AvPairs,
+ MsvAvNbDomainName);
+ }
+
+ if (av_nb_cn != NULL) {
+ const char *v = NULL;
+ char *a = NULL;
+ size_t len;
+
+ v = av_nb_cn->Value.AvNbComputerName;
+
+ a = talloc_strdup(frame, creds->account_name);
+ if (a == NULL) {
+ TALLOC_FREE(frame);
+ return NT_STATUS_NO_MEMORY;
+ }
+ len = strlen(a);
+ if (len > 0 && a[len - 1] == '$') {
+ a[len - 1] = '\0';
+ }
+
+#ifdef SAMBA4_INTERNAL_HEIMDAL /* smbtorture4 for make test */
+ cmp = strcasecmp_m(a, v);
+#else /* smbd */
+ cmp = StrCaseCmp(a, v);
+#endif
+ if (cmp != 0) {
+ DEBUG(2,("%s: NTLMv2_RESPONSE with "
+ "NbComputerName[%s] rejected "
+ "for user[%s\\%s] "
+ "against SEC_CHAN_WKSTA[%s/%s] "
+ "in workgroup[%s]\n",
+ __func__, v,
+ account_domain,
+ account_name,
+ creds->computer_name,
+ creds->account_name,
+ workgroup));
+ TALLOC_FREE(frame);
+ return NT_STATUS_LOGON_FAILURE;
+ }
+ }
+ if (av_nb_dn != NULL) {
+ const char *v = NULL;
+
+ v = av_nb_dn->Value.AvNbDomainName;
+
+#ifdef SAMBA4_INTERNAL_HEIMDAL /* smbtorture4 for make test */
+ cmp = strcasecmp_m(workgroup, v);
+#else /* smbd */
+ cmp = StrCaseCmp(workgroup, v);
+#endif
+ if (cmp != 0) {
+ DEBUG(2,("%s: NTLMv2_RESPONSE with "
+ "NbDomainName[%s] rejected "
+ "for user[%s\\%s] "
+ "against SEC_CHAN_WKSTA[%s/%s] "
+ "in workgroup[%s]\n",
+ __func__, v,
+ account_domain,
+ account_name,
+ creds->computer_name,
+ creds->account_name,
+ workgroup));
+ TALLOC_FREE(frame);
+ return NT_STATUS_LOGON_FAILURE;
+ }
+ }
+
+ TALLOC_FREE(frame);
+ return NT_STATUS_OK;
+}
+
/***********************************************************
encode a password buffer with a unicode password. The buffer
is filled with random data to make it harder to attack.
--- a/libcli/auth/wscript_build
+++ b/libcli/auth/wscript_build
@@ -19,7 +19,7 @@ bld.SAMBA_SUBSYSTEM('MSRPC_PARSE',
bld.SAMBA_SUBSYSTEM('LIBCLI_AUTH',
source='credentials.c session.c smbencrypt.c smbdes.c',
- public_deps='MSRPC_PARSE',
+ public_deps='MSRPC_PARSE NDR_NTLMSSP',
public_headers='credentials.h:domain_credentials.h'
)
--- a/source3/Makefile.in
+++ b/source3/Makefile.in
@@ -783,6 +783,7 @@ GROUPDB_OBJ = groupdb/mapping.o groupdb/
PROFILE_OBJ = profile/profile.o
PROFILES_OBJ = utils/profiles.o \
$(LIBSMB_ERR_OBJ) \
+ $(LIBNDR_NTLMSSP_OBJ) \
$(PARAM_OBJ) \
$(LIB_OBJ) $(LIB_DUMMY_OBJ) \
$(POPT_LIB_OBJ) \
@@ -995,10 +996,10 @@ SWAT_OBJ = $(SWAT_OBJ1) $(PARAM_OBJ) $(P
STATUS_OBJ = utils/status.o utils/status_profile.o \
$(LOCKING_OBJ) $(PARAM_OBJ) \
$(PROFILE_OBJ) $(LIB_NONSMBD_OBJ) $(POPT_LIB_OBJ) \
- $(LIBSMB_ERR_OBJ) $(FNAME_UTIL_OBJ)
+ $(LIBSMB_ERR_OBJ) $(LIBNDR_NTLMSSP_OBJ) $(FNAME_UTIL_OBJ)
SMBCONTROL_OBJ = utils/smbcontrol.o $(PARAM_OBJ) $(LIB_NONSMBD_OBJ) \
- $(LIBSMB_ERR_OBJ) $(POPT_LIB_OBJ) $(PRINTBASE_OBJ)
+ $(LIBSMB_ERR_OBJ) $(LIBNDR_NTLMSSP_OBJ) $(POPT_LIB_OBJ) $(PRINTBASE_OBJ)
SMBTREE_OBJ = utils/smbtree.o $(PARAM_OBJ) \
$(PROFILE_OBJ) $(LIB_NONSMBD_OBJ) $(LIBSMB_OBJ) \
@@ -1012,11 +1013,11 @@ SMBTREE_OBJ = utils/smbtree.o $(PARAM_OB
TESTPARM_OBJ = utils/testparm.o \
$(PARAM_OBJ) $(LIB_NONSMBD_OBJ) $(POPT_LIB_OBJ) \
- $(LIBSMB_ERR_OBJ)
+ $(LIBSMB_ERR_OBJ) $(LIBNDR_NTLMSSP_OBJ)
SMBTA_UTIL_OBJ = utils/smbta-util.o $(PARAM_OBJ) $(POPT_LIB_OBJ) \
$(LIB_NONSMBD_OBJ) \
- $(LIBSMB_ERR_OBJ) $(FNAME_UTIL_OBJ)
+ $(LIBSMB_ERR_OBJ) $(LIBNDR_NTLMSSP_OBJ) $(FNAME_UTIL_OBJ)
TEST_LP_LOAD_OBJ = param/test_lp_load.o \
$(PARAM_OBJ) $(LIB_NONSMBD_OBJ) \
@@ -1146,6 +1147,7 @@ SMBCONFTORT_OBJ = $(SMBCONFTORT_OBJ0) \
$(LIB_NONSMBD_OBJ) \
$(PARAM_OBJ) \
$(LIBSMB_ERR_OBJ) \
+ $(LIBNDR_NTLMSSP_OBJ) \
$(POPT_LIB_OBJ)
PTHREADPOOLTEST_OBJ = lib/pthreadpool/pthreadpool.o \
@@ -1229,7 +1231,7 @@ CUPS_OBJ = client/smbspool.o $(PARAM_OBJ
$(LIBNDR_GEN_OBJ0)
NMBLOOKUP_OBJ = utils/nmblookup.o $(PARAM_OBJ) $(LIBNMB_OBJ) \
- $(LIB_NONSMBD_OBJ) $(POPT_LIB_OBJ) $(LIBSMB_ERR_OBJ)
+ $(LIB_NONSMBD_OBJ) $(POPT_LIB_OBJ) $(LIBSMB_ERR_OBJ) $(LIBNDR_NTLMSSP_OBJ)
SMBTORTURE_OBJ1 = torture/torture.o torture/nbio.o torture/scanner.o torture/utable.o \
torture/denytest.o torture/mangle_test.o \
@@ -1253,6 +1255,7 @@ MASKTEST_OBJ = torture/masktest.o $(PARA
$(LIBNDR_GEN_OBJ0)
MSGTEST_OBJ = torture/msgtest.o $(PARAM_OBJ) $(LIBSMB_ERR_OBJ) \
+ $(LIBNDR_NTLMSSP_OBJ) \
$(LIB_NONSMBD_OBJ) \
$(LIBNDR_GEN_OBJ0)
@@ -1269,7 +1272,7 @@ PDBTEST_OBJ = torture/pdbtest.o $(PARAM_
VFSTEST_OBJ = torture/cmd_vfs.o torture/vfstest.o $(SMBD_OBJ_BASE) $(READLINE_OBJ)
-SMBICONV_OBJ = $(PARAM_OBJ) torture/smbiconv.o $(LIB_NONSMBD_OBJ) $(POPT_LIB_OBJ) $(LIBSMB_ERR_OBJ)
+SMBICONV_OBJ = $(PARAM_OBJ) torture/smbiconv.o $(LIB_NONSMBD_OBJ) $(POPT_LIB_OBJ) $(LIBSMB_ERR_OBJ) $(LIBNDR_NTLMSSP_OBJ)
LOG2PCAP_OBJ = utils/log2pcaphex.o
@@ -1297,17 +1300,17 @@ SMBCQUOTAS_OBJ = utils/smbcquotas.o $(LI
EVTLOGADM_OBJ0 = utils/eventlogadm.o
EVTLOGADM_OBJ = $(EVTLOGADM_OBJ0) $(PARAM_OBJ) $(LIB_NONSMBD_OBJ) \
- $(LIBSMB_ERR_OBJ) $(LIB_EVENTLOG_OBJ) \
+ $(LIBSMB_ERR_OBJ) $(LIBNDR_NTLMSSP_OBJ) $(LIB_EVENTLOG_OBJ) \
librpc/gen_ndr/ndr_eventlog.o \
librpc/gen_ndr/ndr_lsa.o
SHARESEC_OBJ0 = utils/sharesec.o
SHARESEC_OBJ = $(SHARESEC_OBJ0) $(PARAM_OBJ) $(LIB_NONSMBD_OBJ) \
- $(LIBSMB_ERR_OBJ) \
+ $(LIBSMB_ERR_OBJ) $(LIBNDR_NTLMSSP_OBJ) \
$(POPT_LIB_OBJ)
TALLOCTORT_OBJ = @tallocdir@/testsuite.o @tallocdir@/testsuite_main.o \
- $(PARAM_OBJ) $(LIB_NONSMBD_OBJ) $(LIBSMB_ERR_OBJ)
+ $(PARAM_OBJ) $(LIB_NONSMBD_OBJ) $(LIBSMB_ERR_OBJ) $(LIBNDR_NTLMSSP_OBJ)
REPLACETORT_OBJ = @libreplacedir@/test/testsuite.o \
@libreplacedir@/test/getifaddrs.o \
@@ -1323,7 +1326,7 @@ SMBFILTER_OBJ = utils/smbfilter.o $(PARA
$(LIBNDR_GEN_OBJ0)
WINBIND_WINS_NSS_OBJ = ../nsswitch/wins.o $(PARAM_OBJ) \
- $(LIB_NONSMBD_OBJ) $(LIBSMB_ERR_OBJ) $(LIBNMB_OBJ)
+ $(LIB_NONSMBD_OBJ) $(LIBSMB_ERR_OBJ) $(LIBNDR_NTLMSSP_OBJ) $(LIBNMB_OBJ)
PAM_SMBPASS_OBJ_0 = pam_smbpass/pam_smb_auth.o pam_smbpass/pam_smb_passwd.o \
pam_smbpass/pam_smb_acct.o pam_smbpass/support.o ../lib/util/asn1.o
@@ -1531,12 +1534,14 @@ RPC_OPEN_TCP_OBJ = torture/rpc_open_tcp.
DBWRAP_TOOL_OBJ = utils/dbwrap_tool.o \
$(PARAM_OBJ) \
$(LIB_NONSMBD_OBJ) \
- $(LIBSMB_ERR_OBJ)
+ $(LIBSMB_ERR_OBJ) \
+ $(LIBNDR_NTLMSSP_OBJ)
DBWRAP_TORTURE_OBJ = utils/dbwrap_torture.o \
$(PARAM_OBJ) \
$(LIB_NONSMBD_OBJ) \
$(LIBSMB_ERR_OBJ) \
+ $(LIBNDR_NTLMSSP_OBJ) \
$(POPT_LIB_OBJ)
SPLIT_TOKENS_OBJ = utils/split_tokens.o \
--- a/source4/torture/raw/samba3misc.c
+++ b/source4/torture/raw/samba3misc.c
@@ -340,6 +340,7 @@ bool torture_samba3_badpath(struct tortu
bool ret = true;
TALLOC_CTX *mem_ctx;
bool nt_status_support;
+ bool client_ntlmv2_auth;
if (!(mem_ctx = talloc_init("torture_samba3_badpath"))) {
d_printf("talloc_init failed\n");
@@ -347,20 +348,17 @@ bool torture_samba3_badpath(struct tortu
}
nt_status_support = lpcfg_nt_status_support(torture->lp_ctx);
+ client_ntlmv2_auth = lpcfg_client_ntlmv2_auth(torture->lp_ctx);
- if (!lpcfg_set_cmdline(torture->lp_ctx, "nt status support", "yes")) {
- printf("Could not set 'nt status support = yes'\n");
- goto fail;
- }
+ torture_assert_goto(torture, lpcfg_set_cmdline(torture->lp_ctx, "nt status support", "yes"), ret, fail, "Could not set 'nt status support = yes'\n");
+ torture_assert_goto(torture, lpcfg_set_cmdline(torture->lp_ctx, "client ntlmv2 auth", "yes"), ret, fail, "Could not set 'client ntlmv2 auth = yes'\n");
if (!torture_open_connection(&cli_nt, torture, 0)) {
goto fail;
}
- if (!lpcfg_set_cmdline(torture->lp_ctx, "nt status support", "no")) {
- printf("Could not set 'nt status support = yes'\n");
- goto fail;
- }
+ torture_assert_goto(torture, lpcfg_set_cmdline(torture->lp_ctx, "nt status support", "no"), ret, fail, "Could not set 'nt status support = no'\n");
+ torture_assert_goto(torture, lpcfg_set_cmdline(torture->lp_ctx, "client ntlmv2 auth", "no"), ret, fail, "Could not set 'client ntlmv2 auth = no'\n");
if (!torture_open_connection(&cli_dos, torture, 1)) {
goto fail;
@@ -373,6 +371,12 @@ bool torture_samba3_badpath(struct tortu
}
smbcli_deltree(cli_nt->tree, dirname);
+ torture_assert_goto(torture, lpcfg_set_cmdline(torture->lp_ctx, "nt status support",
+ nt_status_support ? "yes":"no"),
+ ret, fail, "Could not set 'nt status support' back to where it was\n");
+ torture_assert_goto(torture, lpcfg_set_cmdline(torture->lp_ctx, "client ntlmv2 auth",
+ client_ntlmv2_auth ? "yes":"no"),
+ ret, fail, "Could not set 'client ntlmv2 auth' back to where it was\n");
status = smbcli_mkdir(cli_nt->tree, dirname);
if (!NT_STATUS_IS_OK(status)) {
--- a/source4/torture/basic/base.c
+++ b/source4/torture/basic/base.c
@@ -1476,6 +1476,7 @@ static bool torture_chkpath_test(struct
static bool torture_samba3_errorpaths(struct torture_context *tctx)
{
bool nt_status_support;
+ bool client_ntlmv2_auth;
struct smbcli_state *cli_nt = NULL, *cli_dos = NULL;
bool result = false;
int fnum;
@@ -1485,18 +1486,27 @@ static bool torture_samba3_errorpaths(st
NTSTATUS status;
nt_status_support = lpcfg_nt_status_support(tctx->lp_ctx);
+ client_ntlmv2_auth = lpcfg_client_ntlmv2_auth(tctx->lp_ctx);
if (!lpcfg_set_cmdline(tctx->lp_ctx, "nt status support", "yes")) {
torture_comment(tctx, "Could not set 'nt status support = yes'\n");
goto fail;
}
+ if (!lpcfg_set_cmdline(tctx->lp_ctx, "client ntlmv2 auth", "yes")) {
+ torture_result(tctx, TORTURE_FAIL, "Could not set 'client ntlmv2 auth = yes'\n");
+ goto fail;
+ }
if (!torture_open_connection(&cli_nt, tctx, 0)) {
goto fail;
}
if (!lpcfg_set_cmdline(tctx->lp_ctx, "nt status support", "no")) {
- torture_comment(tctx, "Could not set 'nt status support = yes'\n");
+ torture_result(tctx, TORTURE_FAIL, "Could not set 'nt status support = no'\n");
+ goto fail;
+ }
+ if (!lpcfg_set_cmdline(tctx->lp_ctx, "client ntlmv2 auth", "no")) {
+ torture_result(tctx, TORTURE_FAIL, "Could not set 'client ntlmv2 auth = no'\n");
goto fail;
}
@@ -1506,7 +1516,12 @@ static bool torture_samba3_errorpaths(st
if (!lpcfg_set_cmdline(tctx->lp_ctx, "nt status support",
nt_status_support ? "yes":"no")) {
- torture_comment(tctx, "Could not reset 'nt status support = yes'");
+ torture_result(tctx, TORTURE_FAIL, "Could not reset 'nt status support'");
+ goto fail;
+ }
+ if (!lpcfg_set_cmdline(tctx->lp_ctx, "client ntlmv2 auth",
+ client_ntlmv2_auth ? "yes":"no")) {
+ torture_result(tctx, TORTURE_FAIL, "Could not reset 'client ntlmv2 auth'");
goto fail;
}
--- a/source3/libsmb/cliconnect.c
+++ b/source3/libsmb/cliconnect.c
@@ -2077,6 +2077,17 @@ NTSTATUS cli_session_setup(struct cli_st
NTSTATUS status;
/* otherwise do a NT1 style session setup */
+ if (lp_client_ntlmv2_auth() && lp_client_use_spnego()) {
+ /*
+ * Don't send an NTLMv2 response without NTLMSSP
+ * if we want to use spnego support
+ */
+ DEBUG(1, ("Server does not support EXTENDED_SECURITY "
+ " but 'client use spnego = yes"
+ " and 'client ntlmv2 auth = yes'\n"));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
status = cli_session_setup_nt1(cli, user, pass, passlen,
ntpass, ntpasslen, workgroup);
if (!NT_STATUS_IS_OK(status)) {
--- a/docs-xml/smbdotconf/protocol/clientusespnego.xml
+++ b/docs-xml/smbdotconf/protocol/clientusespnego.xml
@@ -9,6 +9,11 @@
supporting servers (including WindowsXP, Windows2000 and Samba
3.0) to agree upon an authentication
mechanism. This enables Kerberos authentication in particular.</para>
+
+ <para>When <smbconfoption name="client NTLMv2 auth"/> is also set to
+ <constant>yes</constant> extended security (SPNEGO) is required
+ in order to use NTLMv2 only within NTLMSSP. This behavior was
+ introduced with the patches for CVE-2016-2111.</para>
</description>
<value type="default">yes</value>
--- a/docs-xml/smbdotconf/security/clientntlmv2auth.xml
+++ b/docs-xml/smbdotconf/security/clientntlmv2auth.xml
@@ -28,6 +28,11 @@
NTLMv2 by default, and some sites (particularly those following
'best practice' security polices) only allow NTLMv2 responses, and
not the weaker LM or NTLM.</para>
+
+ <para>When <smbconfoption name="client use spnego"/> is also set to
+ <constant>yes</constant> extended security (SPNEGO) is required
+ in order to use NTLMv2 only within NTLMSSP. This behavior was
+ introduced with the patches for CVE-2016-2111.</para>
</description>
<value type="default">yes</value>
</samba:parameter>
--- /dev/null
+++ b/docs-xml/smbdotconf/security/rawntlmv2auth.xml
@@ -0,0 +1,19 @@
+<samba:parameter name="raw NTLMv2 auth"
+ context="G"
+ type="boolean"
+ xmlns:samba="http://www.samba.org/samba/DTD/samba-doc">
+<description>
+ <para>This parameter determines whether or not <citerefentry><refentrytitle>smbd</refentrytitle>
+ <manvolnum>8</manvolnum></citerefentry> will allow SMB1 clients without
+ extended security (without SPNEGO) to use NTLMv2 authentication.</para>
+
+ <para>If this option, <command moreinfo="none">lanman auth</command>
+ and <command moreinfo="none">ntlm auth</command> are all disabled,
+ then only clients with SPNEGO support will be permitted.
+ That means NTLMv2 is only supported within NTLMSSP.</para>
+</description>
+
+<related>lanman auth</related>
+<related>ntlm auth</related>
+<value type="default">no</value>
+</samba:parameter>
--- a/source3/include/proto.h
+++ b/source3/include/proto.h
@@ -1489,6 +1489,7 @@ bool lp_map_untrusted_to_domain(void);
int lp_restrict_anonymous(void);
bool lp_lanman_auth(void);
bool lp_ntlm_auth(void);
+bool lp_raw_ntlmv2_auth(void);
bool lp_client_plaintext_auth(void);
bool lp_client_lanman_auth(void);
bool lp_client_ntlmv2_auth(void);
--- a/source3/param/loadparm.c
+++ b/source3/param/loadparm.c
@@ -336,6 +336,7 @@ struct global {
bool bAllowTrustedDomains;
bool bLanmanAuth;
bool bNTLMAuth;
+ bool bRawNTLMv2Auth;
bool bUseSpnego;
bool bClientLanManAuth;
bool bClientNTLMv2Auth;
@@ -1383,6 +1384,15 @@ static struct parm_struct parm_table[] =
.flags = FLAG_ADVANCED,
},
{
+ .label = "raw NTLMv2 auth",
+ .type = P_BOOL,
+ .p_class = P_GLOBAL,
+ .ptr = &Globals.bRawNTLMv2Auth,
+ .special = NULL,
+ .enum_list = NULL,
+ .flags = FLAG_ADVANCED,
+ },
+ {
.label = "client NTLMv2 auth",
.type = P_BOOL,
.p_class = P_GLOBAL,
@@ -5337,6 +5347,7 @@ static void init_globals(bool reinit_glo
Globals.bClientPlaintextAuth = False; /* Do NOT use a plaintext password even if is requested by the server */
Globals.bLanmanAuth = False; /* Do NOT use the LanMan hash, even if it is supplied */
Globals.bNTLMAuth = True; /* Do use NTLMv1 if it is supplied by the client (otherwise NTLMv2) */
+ Globals.bRawNTLMv2Auth = false; /* Allow NTLMv2 without NTLMSSP */
Globals.bClientNTLMv2Auth = 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 */
@@ -5819,6 +5830,7 @@ FN_GLOBAL_BOOL(lp_map_untrusted_to_domai
FN_GLOBAL_INTEGER(lp_restrict_anonymous, &Globals.restrict_anonymous)
FN_GLOBAL_BOOL(lp_lanman_auth, &Globals.bLanmanAuth)
FN_GLOBAL_BOOL(lp_ntlm_auth, &Globals.bNTLMAuth)
+FN_GLOBAL_BOOL(lp_raw_ntlmv2_auth, &Globals.bRawNTLMv2Auth)
FN_GLOBAL_BOOL(lp_client_plaintext_auth, &Globals.bClientPlaintextAuth)
FN_GLOBAL_BOOL(lp_client_lanman_auth, &Globals.bClientLanManAuth)
FN_GLOBAL_BOOL(lp_client_ntlmv2_auth, &Globals.bClientNTLMv2Auth)
--- a/source3/auth/auth_util.c
+++ b/source3/auth/auth_util.c
@@ -30,6 +30,7 @@
#include "../lib/util/util_pw.h"
#include "lib/winbind_util.h"
#include "passdb.h"
+#include "../lib/tsocket/tsocket.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH
@@ -367,6 +368,19 @@ NTSTATUS make_user_info_for_reply_enc(st
const char *client_domain,
DATA_BLOB lm_resp, DATA_BLOB nt_resp)
{
+ bool allow_raw = lp_raw_ntlmv2_auth();
+
+ if (!allow_raw && nt_resp.length >= 48) {
+ /*
+ * NTLMv2_RESPONSE has at least 48 bytes
+ * and should only be supported via NTLMSSP.
+ */
+ DEBUG(2,("Rejecting raw NTLMv2 authentication with "
+ "user [%s\\%s]\n",
+ client_domain, smb_name));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
return make_user_info_map(user_info, smb_name,
client_domain,
get_remote_machine_name(),
--- a/selftest/target/Samba3.pm
+++ b/selftest/target/Samba3.pm
@@ -127,6 +127,7 @@ sub setup_dc($$)
domain master = yes
domain logons = yes
lanman auth = yes
+ raw NTLMv2 auth = yes
";
my $vars = $self->provision($path,
@@ -230,6 +231,7 @@ sub setup_secserver($$$)
my $secserver_options = "
security = server
password server = $s3dcvars->{SERVER_IP}
+ client ntlmv2 auth = no
";
my $ret = $self->provision($prefix,