src/login/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         "  <method name=\"Kill\">\n"                                    \
  40         "   <arg name=\"who\" type=\"s\"/>\n"                           \
  41         "   <arg name=\"signal\" type=\"s\"/>\n"                        \
  42         "  </method>\n"                                                 \
  43         "  <property name=\"Id\" type=\"s\" access=\"read\"/>\n"        \
  44         "  <property name=\"User\" type=\"(uo)\" access=\"read\"/>\n"   \
  45         "  <property name=\"Name\" type=\"s\" access=\"read\"/>\n"      \
  46         "  <property name=\"Timestamp\" type=\"t\" access=\"read\"/>\n" \
  47         "  <property name=\"TimestampMonotonic\" type=\"t\" access=\"read\"/>\n" \
  48         "  <property name=\"ControlGroupPath\" type=\"s\" access=\"read\"/>\n" \
  49         "  <property name=\"VTNr\" type=\"u\" access=\"read\"/>\n"      \
  50         "  <property name=\"Seat\" type=\"(so)\" access=\"read\"/>\n"   \
  51         "  <property name=\"TTY\" type=\"s\" access=\"read\"/>\n"       \
  52         "  <property name=\"Display\" type=\"s\" access=\"read\"/>\n"   \
  53         "  <property name=\"Remote\" type=\"b\" access=\"read\"/>\n"    \
  54         "  <property name=\"RemoteHost\" type=\"s\" access=\"read\"/>\n" \
  55         "  <property name=\"RemoteUser\" type=\"s\" access=\"read\"/>\n" \
  56         "  <property name=\"Service\" type=\"s\" access=\"read\"/>\n" \
  57         "  <property name=\"Leader\" type=\"u\" access=\"read\"/>\n"    \
  58         "  <property name=\"Audit\" type=\"u\" access=\"read\"/>\n"     \
  59         "  <property name=\"Type\" type=\"s\" access=\"read\"/>\n"      \
  60         "  <property name=\"Class\" type=\"s\" access=\"read\"/>\n"      \
  61         "  <property name=\"Active\" type=\"b\" access=\"read\"/>\n"    \
  62         "  <property name=\"Controllers\" type=\"as\" access=\"read\"/>\n" \
  63         "  <property name=\"ResetControllers\" type=\"as\" access=\"read\"/>\n" \
  64         "  <property name=\"KillProcesses\" type=\"b\" access=\"read\"/>\n" \
  65         "  <property name=\"IdleHint\" type=\"b\" access=\"read\"/>\n"  \
  66         "  <property name=\"IdleSinceHint\" type=\"t\" access=\"read\"/>\n" \
  67         "  <property name=\"IdleSinceHintMonotonic\" type=\"t\" access=\"read\"/>\n" \
  68         " </interface>\n"
  69
  70 #define INTROSPECTION                                                   \
  71         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
  72         "<node>\n"                                                      \
  73         BUS_SESSION_INTERFACE                                           \
  74         BUS_PROPERTIES_INTERFACE                                        \
  75         BUS_PEER_INTERFACE                                              \
  76         BUS_INTROSPECTABLE_INTERFACE                                    \
  77         "</node>\n"
  78
  79 #define INTERFACES_LIST                              \
  80         BUS_GENERIC_INTERFACES_LIST                  \
  81         "org.freedesktop.login1.Session\0"
  82
  83 static int bus_session_append_seat(DBusMessageIter *i, const char *property, void *data) {
  84         DBusMessageIter sub;
  85         Session *s = data;
  86         const char *id, *path;
  87         char *p = NULL;
  88
  89         assert(i);
  90         assert(property);
  91         assert(s);
  92
  93         if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
  94                 return -ENOMEM;
  95
  96         if (s->seat) {
  97                 id = s->seat->id;
  98                 path = p = seat_bus_path(s->seat);
  99
 100                 if (!p)
 101                         return -ENOMEM;
 102         } else {
 103                 id = "";
 104                 path = "/";
 105         }
 106
 107         if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &id) ||
 108             !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &path)) {
 109                 free(p);
 110                 return -ENOMEM;
 111         }
 112
 113         free(p);
 114
 115         if (!dbus_message_iter_close_container(i, &sub))
 116                 return -ENOMEM;
 117
 118         return 0;
 119 }
 120
 121 static int bus_session_append_user(DBusMessageIter *i, const char *property, void *data) {
 122         DBusMessageIter sub;
 123         User *u = data;
 124         char *p = NULL;
 125
 126         assert(i);
 127         assert(property);
 128         assert(u);
 129
 130         if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
 131                 return -ENOMEM;
 132
 133         p = user_bus_path(u);
 134         if (!p)
 135                 return -ENOMEM;
 136
 137         if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &u->uid) ||
 138             !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) {
 139                 free(p);
 140                 return -ENOMEM;
 141         }
 142
 143         free(p);
 144
 145         if (!dbus_message_iter_close_container(i, &sub))
 146                 return -ENOMEM;
 147
 148         return 0;
 149 }
 150
 151 static int bus_session_append_active(DBusMessageIter *i, const char *property, void *data) {
 152         Session *s = data;
 153         dbus_bool_t b;
 154
 155         assert(i);
 156         assert(property);
 157         assert(s);
 158
 159         b = session_is_active(s);
 160         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 161                 return -ENOMEM;
 162
 163         return 0;
 164 }
 165
 166 static int bus_session_append_idle_hint(DBusMessageIter *i, const char *property, void *data) {
 167         Session *s = data;
 168         int b;
 169
 170         assert(i);
 171         assert(property);
 172         assert(s);
 173
 174         b = session_get_idle_hint(s, NULL) > 0;
 175         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 176                 return -ENOMEM;
 177
 178         return 0;
 179 }
 180
 181 static int bus_session_append_idle_hint_since(DBusMessageIter *i, const char *property, void *data) {
 182         Session *s = data;
 183         dual_timestamp t;
 184         uint64_t u;
 185
 186         assert(i);
 187         assert(property);
 188         assert(s);
 189
 190         session_get_idle_hint(s, &t);
 191         u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 192
 193         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
 194                 return -ENOMEM;
 195
 196         return 0;
 197 }
 198
 199 static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_session_append_type, session_type, SessionType);
 200 static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_session_append_class, session_class, SessionClass);
 201
 202 static int get_session_for_path(Manager *m, const char *path, Session **_s) {
 203         Session *s;
 204         char *id;
 205
 206         assert(m);
 207         assert(path);
 208         assert(_s);
 209
 210         if (!startswith(path, "/org/freedesktop/login1/session/"))
 211                 return -EINVAL;
 212
 213         id = bus_path_unescape(path + 32);
 214         if (!id)
 215                 return -ENOMEM;
 216
 217         s = hashmap_get(m->sessions, id);
 218         free(id);
 219
 220         if (!s)
 221                 return -ENOENT;
 222
 223         *_s = s;
 224         return 0;
 225 }
 226
 227 static const BusProperty bus_login_session_properties[] = {
 228         { "Id",                     bus_property_append_string,         "s", offsetof(Session, id),                 true },
 229         { "Timestamp",              bus_property_append_usec,           "t", offsetof(Session, timestamp.realtime)  },
 230         { "TimestampMonotonic",     bus_property_append_usec,           "t", offsetof(Session, timestamp.monotonic) },
 231         { "ControlGroupPath",       bus_property_append_string,         "s", offsetof(Session, cgroup_path),        true },
 232         { "VTNr",                   bus_property_append_uint32,         "u", offsetof(Session, vtnr)                },
 233         { "Seat",                   bus_session_append_seat,         "(so)", 0 },
 234         { "TTY",                    bus_property_append_string,         "s", offsetof(Session, tty),                true },
 235         { "Display",                bus_property_append_string,         "s", offsetof(Session, display),            true },
 236         { "Remote",                 bus_property_append_bool,           "b", offsetof(Session, remote)              },
 237         { "RemoteUser",             bus_property_append_string,         "s", offsetof(Session, remote_user),        true },
 238         { "RemoteHost",             bus_property_append_string,         "s", offsetof(Session, remote_host),        true },
 239         { "Service",                bus_property_append_string,         "s", offsetof(Session, service),            true },
 240         { "Leader",                 bus_property_append_pid,            "u", offsetof(Session, leader)              },
 241         { "Audit",                  bus_property_append_uint32,         "u", offsetof(Session, audit_id)            },
 242         { "Type",                   bus_session_append_type,            "s", offsetof(Session, type)                },
 243         { "Class",                  bus_session_append_class,           "s", offsetof(Session, class)               },
 244         { "Active",                 bus_session_append_active,          "b", 0 },
 245         { "Controllers",            bus_property_append_strv,          "as", offsetof(Session, controllers),        true },
 246         { "ResetControllers",       bus_property_append_strv,          "as", offsetof(Session, reset_controllers),  true },
 247         { "KillProcesses",          bus_property_append_bool,           "b", offsetof(Session, kill_processes)      },
 248         { "IdleHint",               bus_session_append_idle_hint,       "b", 0 },
 249         { "IdleSinceHint",          bus_session_append_idle_hint_since, "t", 0 },
 250         { "IdleSinceHintMonotonic", bus_session_append_idle_hint_since, "t", 0 },
 251         { NULL, }
 252 };
 253
 254 static const BusProperty bus_login_session_user_properties[] = {
 255         { "User",                   bus_session_append_user,         "(uo)", 0 },
 256         { "Name",                   bus_property_append_string,         "s", offsetof(User, name),                  true },
 257         { NULL, }
 258 };
 259
 260 static DBusHandlerResult session_message_dispatch(
 261                 Session *s,
 262                 DBusConnection *connection,
 263                 DBusMessage *message) {
 264
 265         DBusError error;
 266         DBusMessage *reply = NULL;
 267         int r;
 268
 269         assert(s);
 270         assert(connection);
 271         assert(message);
 272
 273         dbus_error_init(&error);
 274
 275         if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Terminate")) {
 276
 277                 r = session_stop(s);
 278                 if (r < 0)
 279                         return bus_send_error_reply(connection, message, NULL, r);
 280
 281                 reply = dbus_message_new_method_return(message);
 282                 if (!reply)
 283                         goto oom;
 284
 285         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Activate")) {
 286
 287                 r = session_activate(s);
 288                 if (r < 0)
 289                         return bus_send_error_reply(connection, message, NULL, r);
 290
 291                 reply = dbus_message_new_method_return(message);
 292                 if (!reply)
 293                         goto oom;
 294
 295         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Lock") ||
 296                    dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Unlock")) {
 297
 298                 if (session_send_lock(s, streq(dbus_message_get_member(message), "Lock")) < 0)
 299                         goto oom;
 300
 301                 reply = dbus_message_new_method_return(message);
 302                 if (!reply)
 303                         goto oom;
 304
 305         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "SetIdleHint")) {
 306                 dbus_bool_t b;
 307                 unsigned long ul;
 308
 309                 if (!dbus_message_get_args(
 310                                     message,
 311                                     &error,
 312                                     DBUS_TYPE_BOOLEAN, &b,
 313                                     DBUS_TYPE_INVALID))
 314                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 315
 316                 ul = dbus_bus_get_unix_user(connection, dbus_message_get_sender(message), &error);
 317                 if (ul == (unsigned long) -1)
 318                         return bus_send_error_reply(connection, message, &error, -EIO);
 319
 320                 if (ul != 0 && ul != s->user->uid)
 321                         return bus_send_error_reply(connection, message, NULL, -EPERM);
 322
 323                 session_set_idle_hint(s, b);
 324
 325                 reply = dbus_message_new_method_return(message);
 326                 if (!reply)
 327                         goto oom;
 328
 329         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Kill")) {
 330                 const char *swho;
 331                 int32_t signo;
 332                 KillWho who;
 333
 334                 if (!dbus_message_get_args(
 335                                     message,
 336                                     &error,
 337                                     DBUS_TYPE_STRING, &swho,
 338                                     DBUS_TYPE_INT32, &signo,
 339                                     DBUS_TYPE_INVALID))
 340                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 341
 342                 if (isempty(swho))
 343                         who = KILL_ALL;
 344                 else {
 345                         who = kill_who_from_string(swho);
 346                         if (who < 0)
 347                                 return bus_send_error_reply(connection, message, &error, -EINVAL);
 348                 }
 349
 350                 if (signo <= 0 || signo >= _NSIG)
 351                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 352
 353                 r = session_kill(s, who, signo);
 354                 if (r < 0)
 355                         return bus_send_error_reply(connection, message, NULL, r);
 356
 357                 reply = dbus_message_new_method_return(message);
 358                 if (!reply)
 359                         goto oom;
 360
 361         } else {
 362                 const BusBoundProperties bps[] = {
 363                         { "org.freedesktop.login1.Session", bus_login_session_properties,      s       },
 364                         { "org.freedesktop.login1.Session", bus_login_session_user_properties, s->user },
 365                         { NULL, }
 366                 };
 367                 return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, bps);
 368         }
 369
 370         if (reply) {
 371                 if (!dbus_connection_send(connection, reply, NULL))
 372                         goto oom;
 373
 374                 dbus_message_unref(reply);
 375         }
 376
 377         return DBUS_HANDLER_RESULT_HANDLED;
 378
 379 oom:
 380         if (reply)
 381                 dbus_message_unref(reply);
 382
 383         dbus_error_free(&error);
 384
 385         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 386 }
 387
 388 static DBusHandlerResult session_message_handler(
 389                 DBusConnection *connection,
 390                 DBusMessage *message,
 391                 void *userdata) {
 392
 393         Manager *m = userdata;
 394         Session *s;
 395         int r;
 396
 397         r = get_session_for_path(m, dbus_message_get_path(message), &s);
 398         if (r < 0) {
 399
 400                 if (r == -ENOMEM)
 401                         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 402
 403                 if (r == -ENOENT) {
 404                         DBusError e;
 405
 406                         dbus_error_init(&e);
 407                         dbus_set_error_const(&e, DBUS_ERROR_UNKNOWN_OBJECT, "Unknown session");
 408                         return bus_send_error_reply(connection, message, &e, r);
 409                 }
 410
 411                 return bus_send_error_reply(connection, message, NULL, r);
 412         }
 413
 414         return session_message_dispatch(s, connection, message);
 415 }
 416
 417 const DBusObjectPathVTable bus_session_vtable = {
 418         .message_function = session_message_handler
 419 };
 420
 421 char *session_bus_path(Session *s) {
 422         char *t, *r;
 423
 424         assert(s);
 425
 426         t = bus_path_escape(s->id);
 427         if (!t)
 428                 return NULL;
 429
 430         r = strappend("/org/freedesktop/login1/session/", t);
 431         free(t);
 432
 433         return r;
 434 }
 435
 436 int session_send_signal(Session *s, bool new_session) {
 437         DBusMessage *m;
 438         int r = -ENOMEM;
 439         char *p = NULL;
 440
 441         assert(s);
 442
 443         m = dbus_message_new_signal("/org/freedesktop/login1",
 444                                     "org.freedesktop.login1.Manager",
 445                                     new_session ? "SessionNew" : "SessionRemoved");
 446
 447         if (!m)
 448                 return -ENOMEM;
 449
 450         p = session_bus_path(s);
 451         if (!p)
 452                 goto finish;
 453
 454         if (!dbus_message_append_args(
 455                             m,
 456                             DBUS_TYPE_STRING, &s->id,
 457                             DBUS_TYPE_OBJECT_PATH, &p,
 458                             DBUS_TYPE_INVALID))
 459                 goto finish;
 460
 461         if (!dbus_connection_send(s->manager->bus, m, NULL))
 462                 goto finish;
 463
 464         r = 0;
 465
 466 finish:
 467         dbus_message_unref(m);
 468         free(p);
 469
 470         return r;
 471 }
 472
 473 int session_send_changed(Session *s, const char *properties) {
 474         DBusMessage *m;
 475         int r = -ENOMEM;
 476         char *p = NULL;
 477
 478         assert(s);
 479
 480         if (!s->started)
 481                 return 0;
 482
 483         p = session_bus_path(s);
 484         if (!p)
 485                 return -ENOMEM;
 486
 487         m = bus_properties_changed_new(p, "org.freedesktop.login1.Session", properties);
 488         if (!m)
 489                 goto finish;
 490
 491         if (!dbus_connection_send(s->manager->bus, m, NULL))
 492                 goto finish;
 493
 494         r = 0;
 495
 496 finish:
 497         if (m)
 498                 dbus_message_unref(m);
 499         free(p);
 500
 501         return r;
 502 }
 503
 504 int session_send_lock(Session *s, bool lock) {
 505         DBusMessage *m;
 506         bool b;
 507         char *p;
 508
 509         assert(s);
 510
 511         p = session_bus_path(s);
 512         if (!p)
 513                 return -ENOMEM;
 514
 515         m = dbus_message_new_signal(p, "org.freedesktop.login1.Session", lock ? "Lock" : "Unlock");
 516         free(p);
 517
 518         if (!m)
 519                 return -ENOMEM;
 520
 521         b = dbus_connection_send(s->manager->bus, m, NULL);
 522         dbus_message_unref(m);
 523
 524         if (!b)
 525                 return -ENOMEM;
 526
 527         return 0;
 528 }