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/*
* Copyright 2016 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 3, as published
* by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranties of
* MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authors:
* Charles Kerr <charles.kerr@canonical.com>
*/
#include <src/adbd-client.h>
#include <src/usb-manager.h>
#include <src/usb-snap.h>
#include <glib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <set>
class UsbManager::Impl
{
public:
explicit Impl(
const std::string& socket_path,
const std::string& public_keys_filename,
const std::shared_ptr<UsbMonitor>& usb_monitor,
const std::shared_ptr<Greeter>& greeter
):
m_socket_path{socket_path},
m_public_keys_filename{public_keys_filename},
m_usb_monitor{usb_monitor},
m_greeter{greeter}
{
m_usb_monitor->on_usb_disconnected().connect([this](const std::string& /*usb_name*/) {
m_req.reset();
});
m_greeter->state().changed().connect([this](const Greeter::State& state) {
if (state == Greeter::State::INACTIVE) {
maybe_snap();
} else {
stop_snap();
}
});
// create a new adbd client
m_adbd_client.reset(new GAdbdClient{m_socket_path});
m_adbd_client->on_pk_request().connect(
[this](const AdbdClient::PKRequest& req) {
g_debug("%s got pk request: %s, calling maybe_snap()", G_STRLOC, req.fingerprint.c_str());
m_response = AdbdClient::PKResponse::DENY; // set the fallback response
m_req.reset(
new AdbdClient::PKRequest(req),
[this](AdbdClient::PKRequest* r) {
stop_snap();
r->respond(m_response);
delete r;
}
);
maybe_snap();
}
);
}
~Impl()
{
if (m_request_complete_idle_tag) {
g_source_remove(m_request_complete_idle_tag);
}
}
private:
void stop_snap()
{
m_snap_connections.clear();
m_snap.reset();
}
void maybe_snap()
{
// only prompt if there's something to prompt about
if (!m_req) {
return;
}
// only prompt in an unlocked session
if (m_greeter->state().get() != Greeter::State::INACTIVE) {
return;
}
snap();
}
void snap()
{
m_snap = std::make_shared<UsbSnap>(m_req->fingerprint);
m_snap_connections.insert((*m_snap).on_user_response().connect(
[this](AdbdClient::PKResponse response, bool remember_choice){
if (remember_choice && (response == AdbdClient::PKResponse::ALLOW)) {
write_public_key(m_req->public_key);
}
m_response = response;
// defer finishing the request into an idle func because
// ScopedConnections can't be destroyed inside their callbacks
if (m_request_complete_idle_tag == 0) {
m_request_complete_idle_tag = g_idle_add([](gpointer gself){
auto self = static_cast<Impl*>(gself);
self->m_request_complete_idle_tag = 0;
self->m_req.reset();
return G_SOURCE_REMOVE;
}, this);
}
}
));
}
void write_public_key(const std::string& public_key)
{
g_debug("%s writing public key '%s' to '%s'", G_STRLOC, public_key.c_str(), m_public_keys_filename.c_str());
// confirm the directory exists
auto dirname = g_path_get_dirname(m_public_keys_filename.c_str());
const auto dir_exists = g_file_test(dirname, G_FILE_TEST_IS_DIR);
if (!dir_exists)
g_warning("ADB data directory '%s' does not exist", dirname);
g_clear_pointer(&dirname, g_free);
if (!dir_exists)
return;
// open the file in append mode, with user rw and group r permissions
const auto fd = open(
m_public_keys_filename.c_str(),
O_APPEND|O_CREAT|O_WRONLY,
S_IRUSR|S_IWUSR|S_IRGRP
);
if (fd == -1) {
g_warning("Error opening ADB datafile: %s", g_strerror(errno));
return;
}
// write the new public key on its own line
std::string buf {public_key + '\n'};
if (write(fd, buf.c_str(), buf.size()) == -1)
g_warning("Error writing ADB datafile: %d %s", errno, g_strerror(errno));
close(fd);
}
const std::string m_socket_path;
const std::string m_public_keys_filename;
const std::shared_ptr<UsbMonitor> m_usb_monitor;
const std::shared_ptr<Greeter> m_greeter;
unsigned int m_request_complete_idle_tag {};
std::shared_ptr<GAdbdClient> m_adbd_client;
std::shared_ptr<UsbSnap> m_snap;
std::set<core::ScopedConnection> m_snap_connections;
AdbdClient::PKResponse m_response {AdbdClient::PKResponse::DENY};
std::shared_ptr<AdbdClient::PKRequest> m_req;
};
/***
****
***/
UsbManager::UsbManager(
const std::string& socket_path,
const std::string& public_keys_filename,
const std::shared_ptr<UsbMonitor>& usb_monitor,
const std::shared_ptr<Greeter>& greeter
):
impl{new Impl{socket_path, public_keys_filename, usb_monitor, greeter}}
{
}
UsbManager::~UsbManager()
{
}
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