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From 8e49de7754f7171a58a1f94dee0f1138dbee3c60 Mon Sep 17 00:00:00 2001
From: Jeremy Allison <jra@samba.org>
Date: Fri, 23 Oct 2015 14:54:31 -0700
Subject: [PATCH] CVE-2015-5299: s3-shadow-copy2: fix missing access check on
snapdir
Fix originally from <partha@exablox.com>
https://bugzilla.samba.org/show_bug.cgi?id=11529
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: David Disseldorp <ddiss@samba.org>
---
source3/modules/vfs_shadow_copy2.c | 47 ++++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
index fedfb53..16c1ed7 100644
--- a/source3/modules/vfs_shadow_copy2.c
+++ b/source3/modules/vfs_shadow_copy2.c
@@ -21,6 +21,8 @@
#include "includes.h"
#include "smbd/smbd.h"
+#include "smbd/globals.h"
+#include "../libcli/security/security.h"
#include "system/filesys.h"
#include "ntioctl.h"
@@ -764,6 +766,43 @@ static int shadow_copy2_mkdir(vfs_handle_struct *handle, const char *fname, mod
SHADOW2_NEXT(MKDIR, (handle, name, mode), int, -1);
}
+static bool check_access_snapdir(struct vfs_handle_struct *handle,
+ const char *path)
+{
+ struct smb_filename smb_fname;
+ int ret;
+ NTSTATUS status;
+ uint32_t access_granted = 0;
+
+ ZERO_STRUCT(smb_fname);
+ smb_fname.base_name = talloc_asprintf(talloc_tos(),
+ "%s",
+ path);
+ if (smb_fname.base_name == NULL) {
+ return false;
+ }
+
+ ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
+ if (ret != 0 || !S_ISDIR(smb_fname.st.st_ex_mode)) {
+ TALLOC_FREE(smb_fname.base_name);
+ return false;
+ }
+
+ status = smbd_check_open_rights(handle->conn,
+ &smb_fname,
+ SEC_DIR_LIST,
+ &access_granted);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0,("user does not have list permission "
+ "on snapdir %s\n",
+ smb_fname.base_name));
+ TALLOC_FREE(smb_fname.base_name);
+ return false;
+ }
+ TALLOC_FREE(smb_fname.base_name);
+ return true;
+}
+
static int shadow_copy2_rmdir(vfs_handle_struct *handle, const char *fname)
{
SHADOW2_NEXT(RMDIR, (handle, name), int, -1);
@@ -877,6 +916,7 @@ static int shadow_copy2_get_shadow_copy2_data(vfs_handle_struct *handle,
SMB_STRUCT_DIRENT *d;
TALLOC_CTX *tmp_ctx = talloc_new(handle->data);
char *snapshot;
+ bool ret;
snapdir = shadow_copy2_find_snapdir(tmp_ctx, handle);
if (snapdir == NULL) {
@@ -886,6 +926,13 @@ static int shadow_copy2_get_shadow_copy2_data(vfs_handle_struct *handle,
talloc_free(tmp_ctx);
return -1;
}
+ ret = check_access_snapdir(handle, snapdir);
+ if (!ret) {
+ DEBUG(0,("access denied on listing snapdir %s\n", snapdir));
+ errno = EACCES;
+ talloc_free(tmp_ctx);
+ return -1;
+ }
p = SMB_VFS_NEXT_OPENDIR(handle, snapdir, NULL, 0);
--
2.5.0
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