From fd4a5fd4639bb1bfd04144fca85856d825e00ab4 Mon Sep 17 00:00:00 2001 From: "Daniel P. Berrange" Date: Fri, 8 Mar 2019 15:21:50 +0000 Subject: chardev: add support for authorization for TLS clients MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Currently any client which can complete the TLS handshake is able to use a chardev server. The server admin can turn on the 'verify-peer' option for the x509 creds to require the client to provide a x509 certificate. This means the client will have to acquire a certificate from the CA before they are permitted to use the chardev server. This is still a fairly low bar. This adds a 'tls-authz=OBJECT-ID' option to the socket chardev backend which takes the ID of a previously added 'QAuthZ' object instance. This will be used to validate the client's x509 distinguished name. Clients failing the check will not be permitted to use the chardev server. For example to setup authorization that only allows connection from a client whose x509 certificate distinguished name contains 'CN=fred', you would use: $QEMU -object tls-creds-x509,id=tls0,dir=/home/berrange/qemutls,\ endpoint=server,verify-peer=yes \ -object authz-simple,id=authz0,identity=CN=laptop.example.com,,\ O=Example Org,,L=London,,ST=London,,C=GB \ -chardev socket,host=127.0.0.1,port=9000,server,\ tls-creds=tls0,tls-authz=authz0 \ ...other qemu args... Signed-off-by: Daniel P. Berrange Reviewed-by: Marc-André Lureau --- qapi/char.json | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'qapi') diff --git a/qapi/char.json b/qapi/char.json index 77ed847..a6e81ac 100644 --- a/qapi/char.json +++ b/qapi/char.json @@ -248,6 +248,11 @@ # @addr: socket address to listen on (server=true) # or connect to (server=false) # @tls-creds: the ID of the TLS credentials object (since 2.6) +# @tls-authz: the ID of the QAuthZ authorization object against which +# the client's x509 distinguished name will be validated. This +# object is only resolved at time of use, so can be deleted +# and recreated on the fly while the chardev server is active. +# If missing, it will default to denying access (since 4.0) # @server: create server socket (default: true) # @wait: wait for incoming connection on server # sockets (default: false). @@ -268,6 +273,7 @@ { 'struct': 'ChardevSocket', 'data': { 'addr': 'SocketAddressLegacy', '*tls-creds': 'str', + '*tls-authz' : 'str', '*server': 'bool', '*wait': 'bool', '*nodelay': 'bool', -- cgit v1.1