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From: "Daniel P. Berrangé" <berrange@redhat.com>
To: qemu-devel@nongnu.org
Cc: "Markus Armbruster" <armbru@redhat.com>,
	"Michael Roth" <michael.roth@amd.com>,
	"Konstantin Kostiuk" <kkostiuk@redhat.com>,
	"Daniel P. Berrangé" <berrange@redhat.com>
Subject: [PATCH 11/14] qga: mark guest-file-* commands with 'unrestricted' flag
Date: Tue,  4 Jun 2024 16:32:39 +0100	[thread overview]
Message-ID: <20240604153242.251334-12-berrange@redhat.com> (raw)
In-Reply-To: <20240604153242.251334-1-berrange@redhat.com>

This blocks use of all the 'guest-file-*' commands unless the QGA is run
with the --unrestricted command line argument.

These commands allow the host admin to read and write arbitrary guest
files and so directly compromise the guest OS.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 qga/qapi-schema.json | 48 ++++++++++++++++++++++++++++++++++++++------
 1 file changed, 42 insertions(+), 6 deletions(-)

diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index de7c1de0b7..2f80d89536 100644
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -283,11 +283,17 @@
 #
 # Returns: Guest file handle
 #
+# Features:
+#
+# @unrestricted: not permitted if agent disables unrestricted
+#                resource access mode
+#
 # Since: 0.15.0
 ##
 { 'command': 'guest-file-open',
   'data':    { 'path': 'str', '*mode': 'str' },
-  'returns': 'int' }
+  'returns': 'int',
+  'features': [ 'unrestricted' ] }
 
 ##
 # @guest-file-close:
@@ -296,10 +302,16 @@
 #
 # @handle: filehandle returned by guest-file-open
 #
+# Features:
+#
+# @unrestricted: not permitted if agent disables unrestricted
+#                resource access mode
+#
 # Since: 0.15.0
 ##
 { 'command': 'guest-file-close',
-  'data': { 'handle': 'int' } }
+  'data': { 'handle': 'int' },
+  'features': [ 'unrestricted' ] }
 
 ##
 # @GuestFileRead:
@@ -332,11 +344,17 @@
 #
 # Returns: @GuestFileRead
 #
+# Features:
+#
+# @unrestricted: not permitted if agent disables unrestricted
+#                resource access mode
+#
 # Since: 0.15.0
 ##
 { 'command': 'guest-file-read',
   'data':    { 'handle': 'int', '*count': 'int' },
-  'returns': 'GuestFileRead' }
+  'returns': 'GuestFileRead',
+  'features': [ 'unrestricted' ] }
 
 ##
 # @GuestFileWrite:
@@ -367,11 +385,17 @@
 #
 # Returns: @GuestFileWrite
 #
+# Features:
+#
+# @unrestricted: not permitted if agent disables unrestricted
+#                resource access mode
+#
 # Since: 0.15.0
 ##
 { 'command': 'guest-file-write',
   'data':    { 'handle': 'int', 'buf-b64': 'str', '*count': 'int' },
-  'returns': 'GuestFileWrite' }
+  'returns': 'GuestFileWrite',
+  'features': [ 'unrestricted' ] }
 
 
 ##
@@ -434,12 +458,18 @@
 #
 # Returns: @GuestFileSeek
 #
+# Features:
+#
+# @unrestricted: not permitted if agent disables unrestricted
+#                resource access mode
+#
 # Since: 0.15.0
 ##
 { 'command': 'guest-file-seek',
   'data':    { 'handle': 'int', 'offset': 'int',
                'whence': 'GuestFileWhence' },
-  'returns': 'GuestFileSeek' }
+  'returns': 'GuestFileSeek',
+  'features': [ 'unrestricted' ] }
 
 ##
 # @guest-file-flush:
@@ -448,10 +478,16 @@
 #
 # @handle: filehandle returned by guest-file-open
 #
+# Features:
+#
+# @unrestricted: not permitted if agent disables unrestricted
+#                resource access mode
+#
 # Since: 0.15.0
 ##
 { 'command': 'guest-file-flush',
-  'data': { 'handle': 'int' } }
+  'data': { 'handle': 'int' },
+  'features': [ 'unrestricted' ] }
 
 ##
 # @GuestFsfreezeStatus:
-- 
2.45.1



  parent reply	other threads:[~2024-06-04 15:34 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-06-04 15:32 [PATCH 00/14] Improve mechanism for configuring allowed commands Daniel P. Berrangé
2024-06-04 15:32 ` [PATCH 01/14] qapi: use "QAPI_FEATURE" as namespace for special features Daniel P. Berrangé
2024-06-04 15:32 ` [PATCH 02/14] qapi: add helper for checking if a command feature is set Daniel P. Berrangé
2024-06-04 15:32 ` [PATCH 03/14] qapi: cope with special feature names containing a '-' Daniel P. Berrangé
2024-07-12  7:54   ` Markus Armbruster
2024-06-04 15:32 ` [PATCH 04/14] qapi: add a 'command-features' pragma Daniel P. Berrangé
2024-07-12  8:07   ` Markus Armbruster
2024-07-12  8:12     ` Daniel P. Berrangé
2024-07-12  8:50       ` Markus Armbruster
2024-07-12  9:17         ` Daniel P. Berrangé
2024-07-16 18:08           ` Markus Armbruster
2024-07-17 10:46             ` Daniel P. Berrangé
2024-07-17 11:43               ` Markus Armbruster
2024-06-04 15:32 ` [PATCH 05/14] qapi: stop hardcoding list of special features Daniel P. Berrangé
2024-06-04 15:32 ` [PATCH 06/14] qapi: define enum for custom special features on commands Daniel P. Berrangé
2024-06-04 15:32 ` [PATCH 07/14] qga: use special feature to mark those that can run when FS are frozen Daniel P. Berrangé
2024-06-04 15:32 ` [PATCH 08/14] qga: add command line to limit commands for confidential guests Daniel P. Berrangé
2024-06-04 15:32 ` [PATCH 09/14] qga: define commands which can be run in confidential mode Daniel P. Berrangé
2024-06-04 15:32 ` [PATCH 10/14] qga: add command line to block unrestricted command/file access Daniel P. Berrangé
2024-06-04 15:32 ` Daniel P. Berrangé [this message]
2024-06-04 15:32 ` [PATCH 12/14] qga: mark guest-exec-* commands with 'unrestricted' flag Daniel P. Berrangé
2024-06-04 15:32 ` [PATCH 13/14] qga: add command line to block user authentication commands Daniel P. Berrangé
2024-06-04 15:32 ` [PATCH 14/14] qga: mark guest-ssh-* / guest-*-password commands with 'unrestricted' flag Daniel P. Berrangé
2024-07-02 18:09 ` [PATCH 00/14] Improve mechanism for configuring allowed commands Daniel P. Berrangé
2024-07-15  9:52 ` Markus Armbruster
2024-07-15 10:56   ` Daniel P. Berrangé

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