aboutsummaryrefslogtreecommitdiff
path: root/src/usb-snap.cpp
blob: 87f46738a13aa174525bf5bc9b96672396ef9341 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
/*
 * 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/usb-snap.h>

#include <glib/gi18n.h>
#include <gio/gio.h>

/***
****
***/

class UsbSnap::Impl
{
public:

    explicit Impl(const std::string& fingerprint):
        m_fingerprint{fingerprint},
        m_cancellable{g_cancellable_new()}
    {
        g_bus_get (G_BUS_TYPE_SESSION, m_cancellable, on_bus_ready_static, this);
    }

    ~Impl()
    {
        g_cancellable_cancel(m_cancellable);
        g_clear_object(&m_cancellable);

        if (m_subscription_id != 0)
            g_dbus_connection_signal_unsubscribe (m_bus, m_subscription_id);

        if (m_notification_id != 0) {
            GError* error {};
            g_dbus_connection_call_sync(m_bus,
                                        BUS_NAME,
                                        OBJECT_PATH,
                                        IFACE_NAME,
                                        "CloseNotification",
                                        g_variant_new("(u)", m_notification_id),
                                        nullptr,
                                        G_DBUS_CALL_FLAGS_NONE,
                                        -1,
                                        nullptr,
                                        &error);
            if (error != nullptr) {
                g_warning("Error closing notification: %s", error->message);
                g_clear_error(&error);
            }
        }

        g_clear_object(&m_bus);
    }

    core::Signal<AdbdClient::PKResponse,bool>& on_user_response()
    {
        return m_on_user_response;
    }

private:

    static void on_bus_ready_static(GObject* /*source*/, GAsyncResult* res, gpointer gself)
    {
        GError* error {};
        auto bus = g_bus_get_finish (res, &error);
        if (error != nullptr) {
            if (!g_error_matches(error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
                g_warning("UsbSnap: Error getting session bus: %s", error->message);
            g_clear_error(&error);
        } else {
            static_cast<Impl*>(gself)->on_bus_ready(bus);
        }
        g_clear_object(&bus);
    }

    void on_bus_ready(GDBusConnection* bus)
    {
        m_bus = G_DBUS_CONNECTION(g_object_ref(G_OBJECT(bus)));

        auto body = g_strdup_printf(_("The computer's RSA key fingerprint is: %s"), m_fingerprint.c_str());

        GVariantBuilder actions_builder;
        g_variant_builder_init(&actions_builder, G_VARIANT_TYPE_STRING_ARRAY);
        g_variant_builder_add(&actions_builder, "s", ACTION_ALLOW);
        g_variant_builder_add(&actions_builder, "s", _("Allow"));
        g_variant_builder_add(&actions_builder, "s", ACTION_DENY);
        g_variant_builder_add(&actions_builder, "s", _("Deny"));

        GVariantBuilder hints_builder;
        g_variant_builder_init(&hints_builder, G_VARIANT_TYPE_VARDICT);
        g_variant_builder_add(&hints_builder, "{sv}", "x-canonical-non-shaped-icon", g_variant_new_string("true"));
        g_variant_builder_add(&hints_builder, "{sv}", "x-canonical-snap-decisions", g_variant_new_string("true"));
        g_variant_builder_add(&hints_builder, "{sv}", "x-canonical-private-affirmative-tint", g_variant_new_string("true"));

        auto args = g_variant_new("(susssasa{sv}i)",
                                  "",
                                  uint32_t(0),
                                  "computer-symbolic",
                                  _("Allow USB Debugging?"),
                                  body,
                                  &actions_builder,
                                  &hints_builder,
                                  -1);
        g_dbus_connection_call(m_bus,
                               BUS_NAME,
                               OBJECT_PATH,
                               IFACE_NAME,
                               "Notify",
                               args,
                               G_VARIANT_TYPE("(u)"),
                               G_DBUS_CALL_FLAGS_NONE,
                               -1, // timeout
                               m_cancellable,
                               on_notify_reply_static,
                               this);

        g_clear_pointer(&body, g_free);
    }

    static void on_notify_reply_static(GObject* obus, GAsyncResult* res, gpointer gself)
    {
        GError* error {};
        auto reply = g_dbus_connection_call_finish (G_DBUS_CONNECTION(obus), res, &error);
        if (error != nullptr) {
            if (!g_error_matches(error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
                g_warning("UsbSnap: Error calling Notify: %s", error->message);
            g_clear_error(&error);
        } else {
            uint32_t id {};
            g_variant_get(reply, "(u)", &id);
            static_cast<Impl*>(gself)->on_notify_reply(id);
        }
        g_clear_pointer(&reply, g_variant_unref);
    }

    void on_notify_reply(uint32_t id)
    {
        m_notification_id = id;

        m_subscription_id = g_dbus_connection_signal_subscribe(m_bus,
                                                               BUS_NAME,
                                                               IFACE_NAME,
                                                               nullptr,
                                                               OBJECT_PATH,
                                                               nullptr,
                                                               G_DBUS_SIGNAL_FLAGS_NONE,
                                                               on_notification_signal_static,
                                                               this,
                                                               nullptr);
    }

    static void on_notification_signal_static(GDBusConnection* /*connection*/,
                                              const gchar* /*sender_name*/,
                                              const gchar* object_path,
                                              const gchar* interface_name,
                                              const gchar* signal_name,
                                              GVariant* parameters,
                                              gpointer gself)
    {
        g_return_if_fail(!g_strcmp0(object_path, OBJECT_PATH));
        g_return_if_fail(!g_strcmp0(interface_name, IFACE_NAME));

        auto self = static_cast<Impl*>(gself);

        if (!g_strcmp0(signal_name, "ActionInvoked"))
        {
            uint32_t id {};
            const char* action_name {};
            g_variant_get(parameters, "(u&s)", &id, &action_name);
            if (id == self->m_notification_id)
                self->on_action_invoked(action_name);
        }
        else if (!g_strcmp0(signal_name, "NotificationClosed"))
        {
            uint32_t id {};
            uint32_t close_reason {};
            g_variant_get(parameters, "(uu)", &id, &close_reason);
            if (id == self->m_notification_id)
                self->on_notification_closed(close_reason);
        }
    }

    void on_action_invoked(const char* action_name)
    {
        const auto response = !g_strcmp0(action_name, ACTION_ALLOW)
            ? AdbdClient::PKResponse::ALLOW
            : AdbdClient::PKResponse::DENY;

        // FIXME: the current default is to cover the most common use case.
        // We need to get the notification ui's checkbox working ASAP so
        // that the user can provide this flag
        const bool remember_this_choice = response == AdbdClient::PKResponse::ALLOW;

        m_on_user_response(response, remember_this_choice);
    }

    void on_notification_closed(uint32_t close_reason)
    {
        if (close_reason == CloseReason::EXPIRED)
            m_on_user_response(AdbdClient::PKResponse::DENY, false);

        m_notification_id = 0;
    }

    static constexpr char const * ACTION_ALLOW {"allow"};
    static constexpr char const * ACTION_DENY  {"deny"};

    static constexpr char const * BUS_NAME    {"org.freedesktop.Notifications" };
    static constexpr char const * IFACE_NAME  {"org.freedesktop.Notifications" };
    static constexpr char const * OBJECT_PATH {"/org/freedesktop/Notifications" };
    enum CloseReason { EXPIRED=1, DISMISSED=2, API=3, UNDEFINED=4 };

    const std::string m_fingerprint;
    core::Signal<AdbdClient::PKResponse,bool> m_on_user_response;
    GCancellable* m_cancellable {};
    GDBusConnection* m_bus {};
    uint32_t m_notification_id {};
    unsigned int m_subscription_id {};
};

/***
****
***/

UsbSnap::UsbSnap(const std::string& public_key):
    impl{new Impl{public_key}}
{
}

UsbSnap::~UsbSnap()
{
}

core::Signal<AdbdClient::PKResponse,bool>&
UsbSnap::on_user_response()
{
    return impl->on_user_response();
}