forked from pool/grub2
957b4bf706
- Switch to '--no-hostonly' when creating the ZIPL initrd in the KIWI build environment to avoid some potential issues due to the missing modules * grub2-s390x-set-hostonly.patch OBS-URL: https://build.opensuse.org/request/show/1191065 OBS-URL: https://build.opensuse.org/package/show/Base:System/grub2?expand=0&rev=510
118 lines
4.2 KiB
Diff
118 lines
4.2 KiB
Diff
From 6c8d390809956d355fed8bc830f64e86838e3e82 Mon Sep 17 00:00:00 2001
|
|
From: Michael Chang <mchang@suse.com>
|
|
Date: Sat, 18 Nov 2023 21:42:00 +0800
|
|
Subject: [PATCH 3/4] Restrict 'ls' and auto file completion on cryptodisk
|
|
print
|
|
|
|
The 'ls' command allows file listing, while file completion assists in
|
|
providing matched file names by partially inputting via the TAB key.
|
|
Both functionalities should be restricted when the disk is automatically
|
|
unlocked for the same reasons as highlighted in the previous patch
|
|
addressing the limitation on file access to the cryptodisk.
|
|
|
|
Given that no file is explicitly opened for listing, employing file
|
|
filters becomes impractical. Consequently, this patch focuses on
|
|
modifying relevant routines separately to incorporate necessary checks.
|
|
The objective is to introduce measures that prevent 'ls' and auto file
|
|
completion from accessing encrypted data when the disk is automatically
|
|
unlocked.
|
|
|
|
By implementing these modifications, any attempt to utilize 'ls' or file
|
|
completion on the cryptodisk will result in an "Access Denied:
|
|
prohibited to browse encrypted data" error message, thus effectively
|
|
alerting the user about the restricted access.
|
|
|
|
While protecting content within disk files from viewing is essential,
|
|
it's equally crucial to restrict access to in-memory content. This
|
|
includes prohibiting access to the decrypted in-memory copies of disk
|
|
files.
|
|
|
|
This enhancement aims to fortify security protocols by extending
|
|
restrictions to additional functionalities beyond direct file access.
|
|
|
|
Signed-Off-by Michael Chang <mchang@suse.com>
|
|
---
|
|
grub-core/commands/ls.c | 8 ++++++++
|
|
grub-core/commands/minicmd.c | 6 ++++++
|
|
grub-core/kern/corecmd.c | 8 ++++++++
|
|
grub-core/normal/completion.c | 8 ++++++++
|
|
4 files changed, 30 insertions(+)
|
|
|
|
diff --git a/grub-core/commands/ls.c b/grub-core/commands/ls.c
|
|
index 8e98c73cc..aeb336a73 100644
|
|
--- a/grub-core/commands/ls.c
|
|
+++ b/grub-core/commands/ls.c
|
|
@@ -183,6 +183,14 @@ grub_ls_list_files (char *dirname, int longlist, int all, int human)
|
|
if (! dev)
|
|
goto fail;
|
|
|
|
+ if (dev->disk &&
|
|
+ grub_disk_is_crypto (dev->disk) &&
|
|
+ grub_file_filters[GRUB_FILE_FILTER_NOCAT])
|
|
+ {
|
|
+ grub_error (GRUB_ERR_ACCESS_DENIED, N_("prohibited to browse encrypted content"));
|
|
+ goto fail;
|
|
+ }
|
|
+
|
|
fs = grub_fs_probe (dev);
|
|
path = grub_strchr (dirname, ')');
|
|
if (! path)
|
|
diff --git a/grub-core/commands/minicmd.c b/grub-core/commands/minicmd.c
|
|
index fa498931e..8f2ac0539 100644
|
|
--- a/grub-core/commands/minicmd.c
|
|
+++ b/grub-core/commands/minicmd.c
|
|
@@ -101,6 +101,12 @@ grub_mini_cmd_dump (struct grub_command *cmd __attribute__ ((unused)),
|
|
if (argc == 0)
|
|
return grub_error (GRUB_ERR_BAD_ARGUMENT, "no address specified");
|
|
|
|
+ /* NOCAT filter is applied to prevent cat alike command from revealing file
|
|
+ * content, the dump command should also be prohibited to revealing memory
|
|
+ * content as well */
|
|
+ if (grub_file_filters[GRUB_FILE_FILTER_NOCAT])
|
|
+ return grub_error (GRUB_ERR_ACCESS_DENIED, N_("prohibited by security policy"));
|
|
+
|
|
#if GRUB_CPU_SIZEOF_VOID_P == GRUB_CPU_SIZEOF_LONG
|
|
#define grub_strtoaddr grub_strtoul
|
|
#else
|
|
diff --git a/grub-core/kern/corecmd.c b/grub-core/kern/corecmd.c
|
|
index 62d434ba9..b639bc3ae 100644
|
|
--- a/grub-core/kern/corecmd.c
|
|
+++ b/grub-core/kern/corecmd.c
|
|
@@ -135,6 +135,14 @@ grub_core_cmd_ls (struct grub_command *cmd __attribute__ ((unused)),
|
|
if (! dev)
|
|
goto fail;
|
|
|
|
+ if (dev->disk &&
|
|
+ grub_disk_is_crypto (dev->disk) &&
|
|
+ grub_file_filters[GRUB_FILE_FILTER_NOCAT])
|
|
+ {
|
|
+ grub_error (GRUB_ERR_ACCESS_DENIED, N_("prohibited to browse encrypted content"));
|
|
+ goto fail;
|
|
+ }
|
|
+
|
|
fs = grub_fs_probe (dev);
|
|
path = grub_strchr (argv[0], ')');
|
|
if (! path)
|
|
diff --git a/grub-core/normal/completion.c b/grub-core/normal/completion.c
|
|
index 18cadfa85..d003ec37d 100644
|
|
--- a/grub-core/normal/completion.c
|
|
+++ b/grub-core/normal/completion.c
|
|
@@ -259,6 +259,14 @@ complete_file (void)
|
|
goto fail;
|
|
}
|
|
|
|
+ if (dev->disk &&
|
|
+ grub_disk_is_crypto (dev->disk) &&
|
|
+ grub_file_filters[GRUB_FILE_FILTER_NOCAT])
|
|
+ {
|
|
+ grub_error (GRUB_ERR_ACCESS_DENIED, N_("prohibited to browse encrypted content"));
|
|
+ goto fail;
|
|
+ }
|
|
+
|
|
fs = grub_fs_probe (dev);
|
|
if (! fs)
|
|
{
|
|
--
|
|
2.42.1
|
|
|