src/logind-session-dbus.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2011 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <string.h>
  24
  25 #include "logind.h"
  26 #include "logind-session.h"
  27 #include "dbus-common.h"
  28 #include "util.h"
  29
  30 #define BUS_SESSION_INTERFACE \
  31         " <interface name=\"org.freedesktop.login1.Session\">\n"        \
  32         "  <method name=\"Terminate\"/>\n"                              \
  33         "  <method name=\"Activate\"/>\n"                               \
  34         "  <method name=\"Lock\"/>\n"                                   \
  35         "  <method name=\"Unlock\"/>\n"                                 \
  36         "  <method name=\"SetIdleHint\">\n"                             \
  37         "   <arg name=\"b\" type=\"b\"/>\n"                             \
  38         "  </method>\n"                                                 \
  39         "  <property name=\"Id\" type=\"u\" access=\"read\"/>\n"        \
  40         "  <property name=\"User\" type=\"(uo)\" access=\"read\"/>\n"   \
  41         "  <property name=\"Name\" type=\"s\" access=\"read\"/>\n"      \
  42         "  <property name=\"Timestamp\" type=\"t\" access=\"read\"/>\n" \
  43         "  <property name=\"TimestampMonotonic\" type=\"t\" access=\"read\"/>\n" \
  44         "  <property name=\"ControlGroupPath\" type=\"s\" access=\"read\"/>\n" \
  45         "  <property name=\"VTNr\" type=\"u\" access=\"read\"/>\n"      \
  46         "  <property name=\"Seat\" type=\"(so)\" access=\"read\"/>\n"   \
  47         "  <property name=\"TTY\" type=\"s\" access=\"read\"/>\n"       \
  48         "  <property name=\"Display\" type=\"s\" access=\"read\"/>\n"   \
  49         "  <property name=\"Remote\" type=\"b\" access=\"read\"/>\n"    \
  50         "  <property name=\"RemoteHost\" type=\"s\" access=\"read\"/>\n" \
  51         "  <property name=\"RemoteUser\" type=\"s\" access=\"read\"/>\n" \
  52         "  <property name=\"Service\" type=\"s\" access=\"read\"/>\n" \
  53         "  <property name=\"Leader\" type=\"u\" access=\"read\"/>\n"    \
  54         "  <property name=\"Audit\" type=\"u\" access=\"read\"/>\n"     \
  55         "  <property name=\"Type\" type=\"s\" access=\"read\"/>\n"      \
  56         "  <property name=\"Active\" type=\"b\" access=\"read\"/>\n"    \
  57         "  <property name=\"Controllers\" type=\"as\" access=\"read\"/>\n" \
  58         "  <property name=\"ResetControllers\" type=\"as\" access=\"read\"/>\n" \
  59         "  <property name=\"KillProcesses\" type=\"b\" access=\"read\"/>\n" \
  60         "  <property name=\"IdleHint\" type=\"b\" access=\"read\"/>\n"  \
  61         "  <property name=\"IdleSinceHint\" type=\"t\" access=\"read\"/>\n" \
  62         "  <property name=\"IdleSinceHintMonotonic\" type=\"t\" access=\"read\"/>\n" \
  63         " </interface>\n"
  64
  65 #define INTROSPECTION                                                   \
  66         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
  67         "<node>\n"                                                      \
  68         BUS_SESSION_INTERFACE                                           \
  69         BUS_PROPERTIES_INTERFACE                                        \
  70         BUS_PEER_INTERFACE                                              \
  71         BUS_INTROSPECTABLE_INTERFACE                                    \
  72         "</node>\n"
  73
  74 #define INTERFACES_LIST                              \
  75         BUS_GENERIC_INTERFACES_LIST                  \
  76         "org.freedesktop.login1.Session\0"
  77
  78 static int bus_session_append_seat(DBusMessageIter *i, const char *property, void *data) {
  79         DBusMessageIter sub;
  80         Session *s = data;
  81         const char *id, *path;
  82         char *p = NULL;
  83
  84         assert(i);
  85         assert(property);
  86         assert(s);
  87
  88         if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
  89                 return -ENOMEM;
  90
  91         if (s->seat) {
  92                 id = s->seat->id;
  93                 path = p = seat_bus_path(s->seat);
  94
  95                 if (!p)
  96                         return -ENOMEM;
  97         } else {
  98                 id = "";
  99                 path = "/";
 100         }
 101
 102         if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &id) ||
 103             !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &path)) {
 104                 free(p);
 105                 return -ENOMEM;
 106         }
 107
 108         free(p);
 109
 110         if (!dbus_message_iter_close_container(i, &sub))
 111                 return -ENOMEM;
 112
 113         return 0;
 114 }
 115
 116 static int bus_session_append_user(DBusMessageIter *i, const char *property, void *data) {
 117         DBusMessageIter sub;
 118         Session *s = data;
 119         char *p = NULL;
 120
 121         assert(i);
 122         assert(property);
 123         assert(s);
 124
 125         if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
 126                 return -ENOMEM;
 127
 128         p = user_bus_path(s->user);
 129         if (!p)
 130                 return -ENOMEM;
 131
 132         if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &s->user->uid) ||
 133             !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) {
 134                 free(p);
 135                 return -ENOMEM;
 136         }
 137
 138         free(p);
 139
 140         if (!dbus_message_iter_close_container(i, &sub))
 141                 return -ENOMEM;
 142
 143         return 0;
 144 }
 145
 146 static int bus_session_append_active(DBusMessageIter *i, const char *property, void *data) {
 147         Session *s = data;
 148         dbus_bool_t b;
 149
 150         assert(i);
 151         assert(property);
 152         assert(s);
 153
 154         b = session_is_active(s);
 155         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 156                 return -ENOMEM;
 157
 158         return 0;
 159 }
 160
 161 static int bus_session_append_idle_hint(DBusMessageIter *i, const char *property, void *data) {
 162         Session *s = data;
 163         int b;
 164
 165         assert(i);
 166         assert(property);
 167         assert(s);
 168
 169         b = session_get_idle_hint(s, NULL) > 0;
 170         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 171                 return -ENOMEM;
 172
 173         return 0;
 174 }
 175
 176 static int bus_session_append_idle_hint_since(DBusMessageIter *i, const char *property, void *data) {
 177         Session *s = data;
 178         dual_timestamp t;
 179         uint64_t u;
 180
 181         assert(i);
 182         assert(property);
 183         assert(s);
 184
 185         session_get_idle_hint(s, &t);
 186         u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 187
 188         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
 189                 return -ENOMEM;
 190
 191         return 0;
 192 }
 193
 194 static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_session_append_type, session_type, SessionType);
 195
 196 static int get_session_for_path(Manager *m, const char *path, Session **_s) {
 197         Session *s;
 198         char *id;
 199
 200         assert(m);
 201         assert(path);
 202         assert(_s);
 203
 204         if (!startswith(path, "/org/freedesktop/login1/session/"))
 205                 return -EINVAL;
 206
 207         id = bus_path_unescape(path + 32);
 208         if (!id)
 209                 return -ENOMEM;
 210
 211         s = hashmap_get(m->sessions, id);
 212         free(id);
 213
 214         if (!s)
 215                 return -ENOENT;
 216
 217         *_s = s;
 218         return 0;
 219 }
 220
 221 static DBusHandlerResult session_message_dispatch(
 222                 Session *s,
 223                 DBusConnection *connection,
 224                 DBusMessage *message) {
 225
 226         const BusProperty properties[] = {
 227                 { "org.freedesktop.login1.Session", "Id",                 bus_property_append_string,   "s",    s->id                   },
 228                 { "org.freedesktop.login1.Session", "User",               bus_session_append_user,      "(uo)", s                       },
 229                 { "org.freedesktop.login1.Session", "Name",               bus_property_append_string,   "s",    s->user->name           },
 230                 { "org.freedesktop.login1.Session", "Timestamp",          bus_property_append_usec,     "t",    &s->timestamp.realtime  },
 231                 { "org.freedesktop.login1.Session", "TimestampMonotonic", bus_property_append_usec,     "t",    &s->timestamp.monotonic },
 232                 { "org.freedesktop.login1.Session", "ControlGroupPath",   bus_property_append_string,   "s",    s->cgroup_path          },
 233                 { "org.freedesktop.login1.Session", "VTNr",               bus_property_append_uint32,   "u",    &s->vtnr                },
 234                 { "org.freedesktop.login1.Session", "Seat",               bus_session_append_seat,      "(so)", s                       },
 235                 { "org.freedesktop.login1.Session", "TTY",                bus_property_append_string,   "s",    s->tty                  },
 236                 { "org.freedesktop.login1.Session", "Display",            bus_property_append_string,   "s",    s->display              },
 237                 { "org.freedesktop.login1.Session", "Remote",             bus_property_append_bool,     "b",    &s->remote              },
 238                 { "org.freedesktop.login1.Session", "RemoteUser",         bus_property_append_string,   "s",    s->remote_user          },
 239                 { "org.freedesktop.login1.Session", "RemoteHost",         bus_property_append_string,   "s",    s->remote_host          },
 240                 { "org.freedesktop.login1.Session", "Service",            bus_property_append_string,   "s",    s->service              },
 241                 { "org.freedesktop.login1.Session", "Leader",             bus_property_append_pid,      "u",    &s->leader              },
 242                 { "org.freedesktop.login1.Session", "Audit",              bus_property_append_uint32,   "u",    &s->audit_id            },
 243                 { "org.freedesktop.login1.Session", "Type",               bus_session_append_type,      "s",    &s->type                },
 244                 { "org.freedesktop.login1.Session", "Active",             bus_session_append_active,    "b",    s                       },
 245                 { "org.freedesktop.login1.Session", "Controllers",        bus_property_append_strv,     "as",   s->controllers          },
 246                 { "org.freedesktop.login1.Session", "ResetControllers",   bus_property_append_strv,     "as",   s->reset_controllers    },
 247                 { "org.freedesktop.login1.Session", "KillProcesses",      bus_property_append_bool,     "b",    &s->kill_processes      },
 248                 { "org.freedesktop.login1.Session", "IdleHint",           bus_session_append_idle_hint, "b",    s                       },
 249                 { "org.freedesktop.login1.Session", "IdleSinceHint",          bus_session_append_idle_hint_since, "t", s                },
 250                 { "org.freedesktop.login1.Session", "IdleSinceHintMonotonic", bus_session_append_idle_hint_since, "t", s                },
 251                 { NULL, NULL, NULL, NULL, NULL }
 252         };
 253
 254         DBusError error;
 255         DBusMessage *reply = NULL;
 256         int r;
 257
 258         assert(s);
 259         assert(connection);
 260         assert(message);
 261
 262         dbus_error_init(&error);
 263
 264         if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Terminate")) {
 265
 266                 r = session_stop(s);
 267                 if (r < 0)
 268                         return bus_send_error_reply(connection, message, NULL, r);
 269
 270                 reply = dbus_message_new_method_return(message);
 271                 if (!reply)
 272                         goto oom;
 273
 274         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Activate")) {
 275
 276                 r = session_activate(s);
 277                 if (r < 0)
 278                         return bus_send_error_reply(connection, message, NULL, r);
 279
 280                 reply = dbus_message_new_method_return(message);
 281                 if (!reply)
 282                         goto oom;
 283
 284         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Lock") ||
 285                    dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Unlock")) {
 286                 bool b;
 287                 DBusMessage *sig;
 288
 289                 sig = dbus_message_new_signal(dbus_message_get_path(message), "org.freedesktop.login1.Session", dbus_message_get_member(message));
 290                 if (!sig)
 291                         goto oom;
 292
 293                 b = dbus_connection_send(connection, sig, NULL);
 294                 dbus_message_unref(sig);
 295
 296                 if (!b)
 297                         goto oom;
 298
 299                 reply = dbus_message_new_method_return(message);
 300                 if (!reply)
 301                         goto oom;
 302
 303         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "SetIdleHint")) {
 304                 dbus_bool_t b;
 305                 unsigned long ul;
 306
 307                 if (!dbus_message_get_args(
 308                                     message,
 309                                     &error,
 310                                     DBUS_TYPE_BOOLEAN, &b,
 311                                     DBUS_TYPE_INVALID))
 312                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 313
 314                 ul = dbus_bus_get_unix_user(connection, dbus_message_get_sender(message), &error);
 315                 if (ul == (unsigned long) -1)
 316                         return bus_send_error_reply(connection, message, &error, -EIO);
 317
 318                 if (ul != 0 && ul != s->user->uid)
 319                         return bus_send_error_reply(connection, message, NULL, -EPERM);
 320
 321                 session_set_idle_hint(s, b);
 322
 323                 reply = dbus_message_new_method_return(message);
 324                 if (!reply)
 325                         goto oom;
 326
 327         } else
 328                 return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, properties);
 329
 330         if (reply) {
 331                 if (!dbus_connection_send(connection, reply, NULL))
 332                         goto oom;
 333
 334                 dbus_message_unref(reply);
 335         }
 336
 337         return DBUS_HANDLER_RESULT_HANDLED;
 338
 339 oom:
 340         if (reply)
 341                 dbus_message_unref(reply);
 342
 343         dbus_error_free(&error);
 344
 345         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 346 }
 347
 348 static DBusHandlerResult session_message_handler(
 349                 DBusConnection *connection,
 350                 DBusMessage *message,
 351                 void *userdata) {
 352
 353         Manager *m = userdata;
 354         Session *s;
 355         int r;
 356
 357         r = get_session_for_path(m, dbus_message_get_path(message), &s);
 358         if (r < 0) {
 359
 360                 if (r == -ENOMEM)
 361                         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 362
 363                 if (r == -ENOENT) {
 364                         DBusError e;
 365
 366                         dbus_error_init(&e);
 367                         dbus_set_error_const(&e, DBUS_ERROR_UNKNOWN_OBJECT, "Unknown session");
 368                         return bus_send_error_reply(connection, message, &e, r);
 369                 }
 370
 371                 return bus_send_error_reply(connection, message, NULL, r);
 372         }
 373
 374         return session_message_dispatch(s, connection, message);
 375 }
 376
 377 const DBusObjectPathVTable bus_session_vtable = {
 378         .message_function = session_message_handler
 379 };
 380
 381 char *session_bus_path(Session *s) {
 382         char *t, *r;
 383
 384         assert(s);
 385
 386         t = bus_path_escape(s->id);
 387         if (!t)
 388                 return NULL;
 389
 390         r = strappend("/org/freedesktop/login1/session/", t);
 391         free(t);
 392
 393         return r;
 394 }
 395
 396 int session_send_signal(Session *s, bool new_session) {
 397         DBusMessage *m;
 398         int r = -ENOMEM;
 399         char *p = NULL;
 400
 401         assert(s);
 402
 403         m = dbus_message_new_signal("/org/freedesktop/login1",
 404                                     "org.freedesktop.login1.Manager",
 405                                     new_session ? "SessionNew" : "SessionRemoved");
 406
 407         if (!m)
 408                 return -ENOMEM;
 409
 410         p = session_bus_path(s);
 411         if (!p)
 412                 goto finish;
 413
 414         if (!dbus_message_append_args(
 415                             m,
 416                             DBUS_TYPE_STRING, &s->id,
 417                             DBUS_TYPE_OBJECT_PATH, &p,
 418                             DBUS_TYPE_INVALID))
 419                 goto finish;
 420
 421         if (!dbus_connection_send(s->manager->bus, m, NULL))
 422                 goto finish;
 423
 424         r = 0;
 425
 426 finish:
 427         dbus_message_unref(m);
 428         free(p);
 429
 430         return r;
 431 }
 432
 433 int session_send_changed(Session *s, const char *properties) {
 434         DBusMessage *m;
 435         int r = -ENOMEM;
 436         char *p = NULL;
 437
 438         assert(s);
 439
 440         if (!s->started)
 441                 return 0;
 442
 443         p = session_bus_path(s);
 444         if (!p)
 445                 return -ENOMEM;
 446
 447         m = bus_properties_changed_new(p, "org.freedesktop.login1.Session", properties);
 448         if (!m)
 449                 goto finish;
 450
 451         if (!dbus_connection_send(s->manager->bus, m, NULL))
 452                 goto finish;
 453
 454         r = 0;
 455
 456 finish:
 457         if (m)
 458                 dbus_message_unref(m);
 459         free(p);
 460
 461         return r;
 462 }