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