From 9fb528332f48de59d70d48686e3af4df70206635 Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Tue, 29 Aug 2017 17:06:21 +0200
Subject: [PATCH 1/7] CVE-2017-12150: s3:popt_common: don't turn a guessed
username into a specified one
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12997
Signed-off-by: Stefan Metzmacher <metze@samba.org>
---
source3/include/auth_info.h | 1 +
source3/lib/popt_common.c | 6 +-----
source3/lib/util_cmdline.c | 29 +++++++++++++++++++++++++++++
3 files changed, 31 insertions(+), 5 deletions(-)
diff --git a/source3/include/auth_info.h b/source3/include/auth_info.h
index c6f71ad..8212c27 100644
--- a/source3/include/auth_info.h
+++ b/source3/include/auth_info.h
@@ -29,6 +29,7 @@ void set_cmdline_auth_info_from_file(struct user_auth_info *auth_info,
const char *get_cmdline_auth_info_username(const struct user_auth_info *auth_info);
void set_cmdline_auth_info_username(struct user_auth_info *auth_info,
const char *username);
+void reset_cmdline_auth_info_username(struct user_auth_info *auth_info);
const char *get_cmdline_auth_info_domain(const struct user_auth_info *auth_info);
void set_cmdline_auth_info_domain(struct user_auth_info *auth_info,
const char *domain);
diff --git a/source3/lib/popt_common.c b/source3/lib/popt_common.c
index 9928c70..36b5e92 100644
--- a/source3/lib/popt_common.c
+++ b/source3/lib/popt_common.c
@@ -238,7 +238,6 @@ void popt_common_credentials_set_delay_post(void)
void popt_common_credentials_post(void)
{
struct user_auth_info *auth_info = cmdline_auth_info;
- const char *username = NULL;
if (get_cmdline_auth_info_use_machine_account(auth_info) &&
!set_cmdline_auth_info_machine_account_creds(auth_info))
@@ -259,10 +258,7 @@ void popt_common_credentials_post(void)
* correctly parsed yet. If we have a username we need to set it again
* to run the string parser for the username correctly.
*/
- username = get_cmdline_auth_info_username(auth_info);
- if (username != NULL && username[0] != '\0') {
- set_cmdline_auth_info_username(auth_info, username);
- }
+ reset_cmdline_auth_info_username(auth_info);
}
static void popt_common_credentials_callback(poptContext con,
diff --git a/source3/lib/util_cmdline.c b/source3/lib/util_cmdline.c
index ad51a4f..80142e2 100644
--- a/source3/lib/util_cmdline.c
+++ b/source3/lib/util_cmdline.c
@@ -37,6 +37,7 @@
struct user_auth_info {
struct cli_credentials *creds;
struct loadparm_context *lp_ctx;
+ bool got_username;
bool got_pass;
int signing_state;
bool smb_encrypt;
@@ -93,6 +94,7 @@ void set_cmdline_auth_info_from_file(struct user_auth_info *auth_info,
if (!ok) {
exit(EIO);
}
+ auth_info->got_username = true;
}
const char *get_cmdline_auth_info_username(const struct user_auth_info *auth_info)
@@ -123,11 +125,38 @@ void set_cmdline_auth_info_username(struct user_auth_info *auth_info,
exit(ENOMEM);
}
+ auth_info->got_username = true;
if (strchr_m(username, '%') != NULL) {
auth_info->got_pass = true;
}
}
+void reset_cmdline_auth_info_username(struct user_auth_info *auth_info)
+{
+ const char *username = NULL;
+ const char *new_val = NULL;
+
+ if (!auth_info->got_username) {
+ return;
+ }
+
+ username = cli_credentials_get_username(auth_info->creds);
+ if (username == NULL) {
+ return;
+ }
+ if (username[0] == '\0') {
+ return;
+ }
+
+ cli_credentials_parse_string(auth_info->creds,
+ username,
+ CRED_SPECIFIED);
+ new_val = cli_credentials_get_username(auth_info->creds);
+ if (new_val == NULL) {
+ exit(ENOMEM);
+ }
+}
+
const char *get_cmdline_auth_info_domain(const struct user_auth_info *auth_info)
{
const char *domain = NULL;
--
1.9.1
From 97a7ddff5d327bf5bcc27c8a88b000b3a187a827 Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Thu, 3 Nov 2016 17:16:43 +0100
Subject: [PATCH 2/7] CVE-2017-12150: s3:lib:
get_cmdline_auth_info_signing_state smb_encrypt SMB_SIGNING_REQUIRED
This is an addition to the fixes for CVE-2015-5296.
It applies to smb2mount -e, smbcacls -e and smbcquotas -e.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12997
Signed-off-by: Stefan Metzmacher <metze@samba.org>
---
source3/lib/util_cmdline.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/source3/lib/util_cmdline.c b/source3/lib/util_cmdline.c
index 80142e2..90ee67c 100644
--- a/source3/lib/util_cmdline.c
+++ b/source3/lib/util_cmdline.c
@@ -265,6 +265,9 @@ void set_cmdline_auth_info_signing_state_raw(struct user_auth_info *auth_info,
int get_cmdline_auth_info_signing_state(const struct user_auth_info *auth_info)
{
+ if (auth_info->smb_encrypt) {
+ return SMB_SIGNING_REQUIRED;
+ }
return auth_info->signing_state;
}
--
1.9.1
From b760a464ee3d94edeff6eb10a0b08359d6e98099 Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Fri, 9 Dec 2016 09:26:32 +0100
Subject: [PATCH 3/7] CVE-2017-12150: s3:pylibsmb: make use of
SMB_SIGNING_DEFAULT for 'samba.samba3.libsmb_samba_internal'
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12997
Signed-off-by: Stefan Metzmacher <metze@samba.org>
---
source3/libsmb/pylibsmb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/source3/libsmb/pylibsmb.c b/source3/libsmb/pylibsmb.c
index 59c0998..350c6d4 100644
--- a/source3/libsmb/pylibsmb.c
+++ b/source3/libsmb/pylibsmb.c
@@ -444,7 +444,7 @@ static int py_cli_state_init(struct py_cli_state *self, PyObject *args,
req = cli_full_connection_creds_send(
NULL, self->ev, "myname", host, NULL, 0, share, "?????",
- cli_creds, 0, 0);
+ cli_creds, 0, SMB_SIGNING_DEFAULT);
if (!py_tevent_req_wait_exc(self->ev, req)) {
return -1;
}
--
1.9.1
From f42ffde214c3be1d6ba3afd8fe88a3e04470c4bd Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Mon, 12 Dec 2016 05:49:46 +0100
Subject: [PATCH 4/7] CVE-2017-12150: libgpo: make use of SMB_SIGNING_REQUIRED
in gpo_connect_server()
It's important that we use a signed connection to get the GPOs!
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12997
Signed-off-by: Stefan Metzmacher <metze@samba.org>
---
libgpo/gpo_fetch.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libgpo/gpo_fetch.c b/libgpo/gpo_fetch.c
index 836bc23..3740d4e 100644
--- a/libgpo/gpo_fetch.c
+++ b/libgpo/gpo_fetch.c
@@ -133,7 +133,7 @@ static NTSTATUS gpo_connect_server(ADS_STRUCT *ads,
ads->auth.password,
CLI_FULL_CONNECTION_USE_KERBEROS |
CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS,
- Undefined);
+ SMB_SIGNING_REQUIRED);
if (!NT_STATUS_IS_OK(result)) {
DEBUG(10,("check_refresh_gpo: "
"failed to connect: %s\n",
--
1.9.1
From d8c6aceb94ab72991eb538ab5dc388686a177052 Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Tue, 29 Aug 2017 15:24:14 +0200
Subject: [PATCH 5/7] CVE-2017-12150: auth/credentials:
cli_credentials_authentication_requested() should check for
NTLM_CCACHE/SIGN/SEAL
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12997
Signed-off-by: Stefan Metzmacher <metze@samba.org>
---
auth/credentials/credentials.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/auth/credentials/credentials.c b/auth/credentials/credentials.c
index 06648c7..5e3b5e8 100644
--- a/auth/credentials/credentials.c
+++ b/auth/credentials/credentials.c
@@ -25,6 +25,7 @@
#include "librpc/gen_ndr/samr.h" /* for struct samrPassword */
#include "auth/credentials/credentials.h"
#include "auth/credentials/credentials_internal.h"
+#include "auth/gensec/gensec.h"
#include "libcli/auth/libcli_auth.h"
#include "tevent.h"
#include "param/param.h"
@@ -300,6 +301,8 @@ _PUBLIC_ bool cli_credentials_set_principal_callback(struct cli_credentials *cre
_PUBLIC_ bool cli_credentials_authentication_requested(struct cli_credentials *cred)
{
+ uint32_t gensec_features = 0;
+
if (cred->bind_dn) {
return true;
}
@@ -327,6 +330,19 @@ _PUBLIC_ bool cli_credentials_authentication_requested(struct cli_credentials *c
return true;
}
+ gensec_features = cli_credentials_get_gensec_features(cred);
+ if (gensec_features & GENSEC_FEATURE_NTLM_CCACHE) {
+ return true;
+ }
+
+ if (gensec_features & GENSEC_FEATURE_SIGN) {
+ return true;
+ }
+
+ if (gensec_features & GENSEC_FEATURE_SEAL) {
+ return true;
+ }
+
return false;
}
--
1.9.1
From 28f4a8dbd2b82bb8fb9f6224e1641d935766e62a Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Tue, 29 Aug 2017 15:35:49 +0200
Subject: [PATCH 6/7] CVE-2017-12150: libcli/smb: add
smbXcli_conn_signing_mandatory()
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12997
Signed-off-by: Stefan Metzmacher <metze@samba.org>
---
libcli/smb/smbXcli_base.c | 5 +++++
libcli/smb/smbXcli_base.h | 1 +
2 files changed, 6 insertions(+)
diff --git a/libcli/smb/smbXcli_base.c b/libcli/smb/smbXcli_base.c
index b21d796..239e5eb 100644
--- a/libcli/smb/smbXcli_base.c
+++ b/libcli/smb/smbXcli_base.c
@@ -468,6 +468,11 @@ bool smbXcli_conn_use_unicode(struct smbXcli_conn *conn)
return false;
}
+bool smbXcli_conn_signing_mandatory(struct smbXcli_conn *conn)
+{
+ return conn->mandatory_signing;
+}
+
void smbXcli_conn_set_sockopt(struct smbXcli_conn *conn, const char *options)
{
set_socket_options(conn->sock_fd, options);
diff --git a/libcli/smb/smbXcli_base.h b/libcli/smb/smbXcli_base.h
index e48fc35..2594f07 100644
--- a/libcli/smb/smbXcli_base.h
+++ b/libcli/smb/smbXcli_base.h
@@ -47,6 +47,7 @@ bool smbXcli_conn_dfs_supported(struct smbXcli_conn *conn);
enum protocol_types smbXcli_conn_protocol(struct smbXcli_conn *conn);
bool smbXcli_conn_use_unicode(struct smbXcli_conn *conn);
+bool smbXcli_conn_signing_mandatory(struct smbXcli_conn *conn);
void smbXcli_conn_set_sockopt(struct smbXcli_conn *conn, const char *options);
const struct sockaddr_storage *smbXcli_conn_local_sockaddr(struct smbXcli_conn *conn);
--
1.9.1
From 28506663282a1457708c38c58437e9eb9c0002bf Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Mon, 12 Dec 2016 06:07:56 +0100
Subject: [PATCH 7/7] CVE-2017-12150: s3:libsmb: only fallback to anonymous if
authentication was not requested
With forced encryption or required signing we should also don't fallback.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12997
Signed-off-by: Stefan Metzmacher <metze@samba.org>
---
source3/libsmb/clidfs.c | 16 ++++------------
1 file changed, 4 insertions(+), 12 deletions(-)
diff --git a/source3/libsmb/clidfs.c b/source3/libsmb/clidfs.c
index 75012b2..fdcd665 100644
--- a/source3/libsmb/clidfs.c
+++ b/source3/libsmb/clidfs.c
@@ -26,6 +26,7 @@
#include "trans2.h"
#include "libsmb/nmblib.h"
#include "../libcli/smb/smbXcli_base.h"
+#include "auth/credentials/credentials.h"
/********************************************************************
Important point.
@@ -145,9 +146,6 @@ static NTSTATUS do_connect(TALLOC_CTX *ctx,
char *servicename;
char *sharename;
char *newserver, *newshare;
- const char *username;
- const char *password;
- const char *domain;
NTSTATUS status;
int flags = 0;
int signing_state = get_cmdline_auth_info_signing_state(auth_info);
@@ -225,21 +223,15 @@ static NTSTATUS do_connect(TALLOC_CTX *ctx,
smb2cli_conn_set_max_credits(c->conn, DEFAULT_SMB2_MAX_CREDITS);
}
- username = get_cmdline_auth_info_username(auth_info);
- password = get_cmdline_auth_info_password(auth_info);
- domain = get_cmdline_auth_info_domain(auth_info);
- if ((domain == NULL) || (domain[0] == '\0')) {
- domain = lp_workgroup();
- }
-
creds = get_cmdline_auth_info_creds(auth_info);
status = cli_session_setup_creds(c, creds);
if (!NT_STATUS_IS_OK(status)) {
/* If a password was not supplied then
* try again with a null username. */
- if (password[0] || !username[0] ||
- get_cmdline_auth_info_use_kerberos(auth_info) ||
+ if (force_encrypt || smbXcli_conn_signing_mandatory(c->conn) ||
+ cli_credentials_authentication_requested(creds) ||
+ cli_credentials_is_anonymous(creds) ||
!NT_STATUS_IS_OK(status = cli_session_setup_anon(c)))
{
d_printf("session setup failed: %s\n",
--
1.9.1