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bh=PC9b9zdl5x37neT0fm6L/j00JU90/UGjPDU7u57umto=; b=iUWAGMqG8K2JQXO8/hpG28QxAoe0KqQ1s3jf9zO3fphr90tVbaRpBDv2Ed2AxC7U1vyqQk Ll5TKXLtqDdX7kSvWzjZdKZb2urjGu8JOhQsZ26ge6rbvVVZ9XKs8+JDLUCCobTS0xLohN PZ55dmy25qEMYt+TP3avdjFv3mcBY1c= X-MC-Unique: UfIxTNOIO5KySLij-riYcw-1 From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Cc: Markus Armbruster , Michael Roth , Konstantin Kostiuk , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= Subject: [PATCH 08/14] qga: add command line to limit commands for confidential guests Date: Tue, 4 Jun 2024 16:32:36 +0100 Message-ID: <20240604153242.251334-9-berrange@redhat.com> In-Reply-To: <20240604153242.251334-1-berrange@redhat.com> References: <20240604153242.251334-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.9 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer2=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer2=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1717515279736100001 When running in a confidential guest, a very large number of QGA commands are unsafe to permit, since they can be used to violate the privacy of the guest. This introduces a new command line "--confidential" / "-i" which, if set, will run the guest in confidential mode, which should avoid leaking information to the host, while still allowing important VM mgmt tasks to be performed. Signed-off-by: Daniel P. Berrang=C3=A9 --- qga/main.c | 14 ++++++++++++++ qga/qapi-schema.json | 5 ++++- 2 files changed, 18 insertions(+), 1 deletion(-) diff --git a/qga/main.c b/qga/main.c index 7bf5ec49ba..12b91eb713 100644 --- a/qga/main.c +++ b/qga/main.c @@ -86,6 +86,7 @@ struct GAConfig { gchar *aliststr; /* allowedrpcs may point to this string */ GList *blockedrpcs; GList *allowedrpcs; + bool only_confidential; int daemonize; GLogLevelFlags log_level; int dumpconf; @@ -415,6 +416,15 @@ static bool ga_command_is_allowed(const QmpCommand *cm= d, GAState *state) /* Fallback policy is allow everything */ bool allowed =3D true; =20 + /* + * If running in confidential mode, block commands that + * would violate guest data privacy + */ + if (config->only_confidential && + !qmp_command_has_feature(cmd, QAPI_FEATURE_CONFIDENTIAL)) { + allowed =3D false; + } + if (config->allowedrpcs) { /* * If an allow-list is given, this changes the fallback @@ -1197,6 +1207,7 @@ static void config_parse(GAConfig *config, int argc, = char **argv) #endif { "statedir", 1, NULL, 't' }, { "retry-path", 0, NULL, 'r' }, + { "confidential", 0, NULL, 'i' }, { NULL, 0, NULL, 0 } }; =20 @@ -1293,6 +1304,9 @@ static void config_parse(GAConfig *config, int argc, = char **argv) } break; #endif + case 'i': + config->only_confidential =3D true; + break; case 'h': usage(argv[0]); exit(EXIT_SUCCESS); diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json index 8b1eff3abc..9a213dfc06 100644 --- a/qga/qapi-schema.json +++ b/qga/qapi-schema.json @@ -39,7 +39,10 @@ 'GuestNVMeSmart' ], 'command-features': [ # Commands permitted while FS are frozen - 'fs-frozen' + 'fs-frozen', + # Commands which do not violate privacy + # of a confidential guest + 'confidential' ] } } =20 ## --=20 2.45.1