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From 25139116756cc285a3a5534834cc276ef1b7baaa Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Wed, 30 Sep 2015 21:17:02 +0200
Subject: [PATCH 1/2] CVE-2015-5296: s3:libsmb: force signing when requiring
encryption in do_connect()
BUG: https://bugzilla.samba.org/show_bug.cgi?id=11536
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
---
source3/libsmb/clidfs.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/source3/libsmb/clidfs.c
+++ b/source3/libsmb/clidfs.c
@@ -98,6 +98,11 @@ static struct cli_state *do_connect(TALL
const char *username;
const char *password;
NTSTATUS status;
+ int signing_state = get_cmdline_auth_info_signing_state(auth_info);
+
+ if (force_encrypt) {
+ signing_state = Required;
+ }
/* make a copy so we don't modify the global string 'service' */
servicename = talloc_strdup(ctx,share);
@@ -132,7 +137,7 @@ static struct cli_state *do_connect(TALL
zero_sockaddr(&ss);
/* have to open a new connection */
- c = cli_initialise_ex(get_cmdline_auth_info_signing_state(auth_info));
+ c = cli_initialise_ex(signing_state);
if (c == NULL) {
d_printf("Connection to %s failed\n", server_n);
return NULL;
--- a/source3/libsmb/libsmb_server.c
+++ b/source3/libsmb/libsmb_server.c
@@ -258,6 +258,7 @@ SMBC_server_internal(TALLOC_CTX *ctx,
const char *username_used;
NTSTATUS status;
char *newserver, *newshare;
+ int signing_state = Undefined;
zero_sockaddr(&ss);
ZERO_STRUCT(c);
@@ -404,8 +405,12 @@ again:
zero_sockaddr(&ss);
+ if (context->internal->smb_encryption_level != SMBC_ENCRYPTLEVEL_NONE) {
+ signing_state = Required;
+ }
+
/* have to open a new connection */
- if ((c = cli_initialise()) == NULL) {
+ if ((c = cli_initialise_ex(signing_state)) == NULL) {
errno = ENOMEM;
return NULL;
}
@@ -750,6 +755,7 @@ SMBC_attr_server(TALLOC_CTX *ctx,
ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
pp_workgroup, pp_username, pp_password);
if (!ipc_srv) {
+ int signing_state = Undefined;
/* We didn't find a cached connection. Get the password */
if (!*pp_password || (*pp_password)[0] == '\0') {
@@ -771,6 +777,9 @@ SMBC_attr_server(TALLOC_CTX *ctx,
if (smbc_getOptionUseCCache(context)) {
flags |= CLI_FULL_CONNECTION_USE_CCACHE;
}
+ if (context->internal->smb_encryption_level != SMBC_ENCRYPTLEVEL_NONE) {
+ signing_state = Required;
+ }
zero_sockaddr(&ss);
nt_status = cli_full_connection(&ipc_cli,
@@ -780,7 +789,7 @@ SMBC_attr_server(TALLOC_CTX *ctx,
*pp_workgroup,
*pp_password,
flags,
- Undefined);
+ signing_state);
if (! NT_STATUS_IS_OK(nt_status)) {
DEBUG(1,("cli_full_connection failed! (%s)\n",
nt_errstr(nt_status)));
|
