Re: [libvirt] [PATCH 9/9] remote: pass identity across to newly opened daemons

On 9/5/19 1:56 PM, Daniel P. Berrangé wrote: > When opening a connection to a second driver inside the daemon, we must > ensure the identity of the current user is passed across. This allows > the second daemon to perform access control checks against the real end > users, instead of against the libvirt daemon that's proxying across the > API calls. > > Signed-off-by: Daniel P. Berrangé <berrange(a)redhat.com&gt; > --- > src/libvirt_remote.syms | 1 + > src/remote/remote_daemon_dispatch.c | 112 +++++++++++++++++++++++++--- > src/remote/remote_driver.c | 1 + > src/remote/remote_protocol.x | 16 +++- > src/remote_protocol-structs | 8 ++ > src/rpc/virnetserverclient.c | 12 +++ > src/rpc/virnetserverclient.h | 2 + > 7 files changed, 139 insertions(+), 13 deletions(-) > > /* Define the program number, protocol version and procedure numbers here. */ > @@ -6603,5 +6611,11 @@ enum remote_procedure { > * @generate: none > * @acl: domain:write > */ > - REMOTE_PROC_DOMAIN_GET_GUEST_INFO = 418 > + REMOTE_PROC_DOMAIN_GET_GUEST_INFO = 418, > + > + /** > + * @generate: client > + * @acl: connect:write > + */ > + REMOTE_PROC_CONNECT_SET_IDENTITY = 419 IIUC, the only thing that stops a malicious user from switching identity is that they have write access on the opened connection?

Because on one hand we want secondary daemons to accept identity switches from the proxy daemon, but at the same time we don't want users to do that.

Code-wise, patches are good and I'd ACK them, but this is a bit unclear to me so I'd like to understand it more first. > }; > diff --git a/src/remote_protocol-structs b/src/remote_protocol-structs > index 616c3d5d52..71169c4148 100644 > --- a/src/remote_protocol-structs > +++ b/src/remote_protocol-structs > @@ -3115,6 +3115,13 @@ struct remote_domain_get_guest_info_ret { > u_int params_len; > remote_typed_param * params_val; > } params; > +} s/}/};/ > +struct remote_connect_set_identity_args { > + struct { > + u_int params_len; > + remote_typed_param * params_val; > + } params; > + u_int flags; > }; Michal