package/network/services/samba36/patches/012-patch-cve-2015-5299.patch

   1 From 8e49de7754f7171a58a1f94dee0f1138dbee3c60 Mon Sep 17 00:00:00 2001
   2 From: Jeremy Allison <jra@samba.org>
   3 Date: Fri, 23 Oct 2015 14:54:31 -0700
   4 Subject: [PATCH] CVE-2015-5299: s3-shadow-copy2: fix missing access check on
   5  snapdir
   6
   7 Fix originally from <partha@exablox.com>
   8
   9 https://bugzilla.samba.org/show_bug.cgi?id=11529
  10
  11 Signed-off-by: Jeremy Allison <jra@samba.org>
  12 Reviewed-by: David Disseldorp <ddiss@samba.org>
  13 ---
  14  source3/modules/vfs_shadow_copy2.c | 47 ++++++++++++++++++++++++++++++++++++++
  15  1 file changed, 47 insertions(+)
  16
  17 --- a/source3/modules/vfs_shadow_copy2.c
  18 +++ b/source3/modules/vfs_shadow_copy2.c
  19 @@ -21,6 +21,8 @@
  20
  21  #include "includes.h"
  22  #include "smbd/smbd.h"
  23 +#include "smbd/globals.h"
  24 +#include "../libcli/security/security.h"
  25  #include "system/filesys.h"
  26  #include "ntioctl.h"
  27
  28 @@ -764,6 +766,43 @@ static int shadow_copy2_mkdir(vfs_handle
  29          SHADOW2_NEXT(MKDIR, (handle, name, mode), int, -1);
  30  }
  31
  32 +static bool check_access_snapdir(struct vfs_handle_struct *handle,
  33 +                               const char *path)
  34 +{
  35 +       struct smb_filename smb_fname;
  36 +       int ret;
  37 +       NTSTATUS status;
  38 +       uint32_t access_granted = 0;
  39 +
  40 +       ZERO_STRUCT(smb_fname);
  41 +       smb_fname.base_name = talloc_asprintf(talloc_tos(),
  42 +                                               "%s",
  43 +                                               path);
  44 +       if (smb_fname.base_name == NULL) {
  45 +               return false;
  46 +       }
  47 +
  48 +       ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
  49 +       if (ret != 0 || !S_ISDIR(smb_fname.st.st_ex_mode)) {
  50 +               TALLOC_FREE(smb_fname.base_name);
  51 +               return false;
  52 +       }
  53 +
  54 +       status = smbd_check_open_rights(handle->conn,
  55 +                                       &smb_fname,
  56 +                                       SEC_DIR_LIST,
  57 +                                       &access_granted);
  58 +       if (!NT_STATUS_IS_OK(status)) {
  59 +               DEBUG(0,("user does not have list permission "
  60 +                       "on snapdir %s\n",
  61 +                       smb_fname.base_name));
  62 +               TALLOC_FREE(smb_fname.base_name);
  63 +               return false;
  64 +       }
  65 +       TALLOC_FREE(smb_fname.base_name);
  66 +       return true;
  67 +}
  68 +
  69  static int shadow_copy2_rmdir(vfs_handle_struct *handle,  const char *fname)
  70  {
  71          SHADOW2_NEXT(RMDIR, (handle, name), int, -1);
  72 @@ -877,6 +916,7 @@ static int shadow_copy2_get_shadow_copy2
  73         SMB_STRUCT_DIRENT *d;
  74         TALLOC_CTX *tmp_ctx = talloc_new(handle->data);
  75         char *snapshot;
  76 +       bool ret;
  77
  78         snapdir = shadow_copy2_find_snapdir(tmp_ctx, handle);
  79         if (snapdir == NULL) {
  80 @@ -886,6 +926,13 @@ static int shadow_copy2_get_shadow_copy2
  81                 talloc_free(tmp_ctx);
  82                 return -1;
  83         }
  84 +       ret = check_access_snapdir(handle, snapdir);
  85 +       if (!ret) {
  86 +               DEBUG(0,("access denied on listing snapdir %s\n", snapdir));
  87 +               errno = EACCES;
  88 +               talloc_free(tmp_ctx);
  89 +               return -1;
  90 +       }
  91
  92         p = SMB_VFS_NEXT_OPENDIR(handle, snapdir, NULL, 0);
  93