Juju Core's Joyent provider before version 1.25.5 uploads the user's private ssh key.
{
"availability": "No subscription required",
"binaries": [
{
"binary_name": "juju",
"binary_version": "1.24.7-0ubuntu1~14.04.1"
},
{
"binary_name": "juju-core",
"binary_version": "1.24.7-0ubuntu1~14.04.1"
},
{
"binary_name": "juju-local",
"binary_version": "1.24.7-0ubuntu1~14.04.1"
},
{
"binary_name": "juju-local-kvm",
"binary_version": "1.24.7-0ubuntu1~14.04.1"
}
]
}