api: disallow virConnectGetDomainCapabilities on read-only connections

This API can be used to execute arbitrary emulators.
Forbid it on read-only connections.

Fixes: CVE-2019-10167
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
(cherry picked from commit 8afa68bac0cf99d1f8aaa6566685c43c22622f26)
Signed-off-by: Ján Tomko <jtomko@redhat.com>

diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 5b7c997b6fed8a57f67070294b3616755df1ba5a..22972979e77692a15e9e3c446714f53d51f7df4e 100644 (file)
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11216,6 +11216,7 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
     virResetLastError();
 
     virCheckConnectReturn(conn, NULL);
+    virCheckReadOnlyGoto(conn->flags, error);
 
     if (conn->driver->connectGetDomainCapabilities) {
         char *ret;