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