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         "  <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         Session *s = data;
 123         char *p = NULL;
 124
 125         assert(i);
 126         assert(property);
 127         assert(s);
 128
 129         if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
 130                 return -ENOMEM;
 131
 132         p = user_bus_path(s->user);
 133         if (!p)
 134                 return -ENOMEM;
 135
 136         if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &s->user->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 DBusHandlerResult session_message_dispatch(
 226                 Session *s,
 227                 DBusConnection *connection,
 228                 DBusMessage *message) {
 229
 230         const BusProperty properties[] = {
 231                 { "org.freedesktop.login1.Session", "Id",                 bus_property_append_string,   "s",    s->id                   },
 232                 { "org.freedesktop.login1.Session", "User",               bus_session_append_user,      "(uo)", s                       },
 233                 { "org.freedesktop.login1.Session", "Name",               bus_property_append_string,   "s",    s->user->name           },
 234                 { "org.freedesktop.login1.Session", "Timestamp",          bus_property_append_usec,     "t",    &s->timestamp.realtime  },
 235                 { "org.freedesktop.login1.Session", "TimestampMonotonic", bus_property_append_usec,     "t",    &s->timestamp.monotonic },
 236                 { "org.freedesktop.login1.Session", "ControlGroupPath",   bus_property_append_string,   "s",    s->cgroup_path          },
 237                 { "org.freedesktop.login1.Session", "VTNr",               bus_property_append_uint32,   "u",    &s->vtnr                },
 238                 { "org.freedesktop.login1.Session", "Seat",               bus_session_append_seat,      "(so)", s                       },
 239                 { "org.freedesktop.login1.Session", "TTY",                bus_property_append_string,   "s",    s->tty                  },
 240                 { "org.freedesktop.login1.Session", "Display",            bus_property_append_string,   "s",    s->display              },
 241                 { "org.freedesktop.login1.Session", "Remote",             bus_property_append_bool,     "b",    &s->remote              },
 242                 { "org.freedesktop.login1.Session", "RemoteUser",         bus_property_append_string,   "s",    s->remote_user          },
 243                 { "org.freedesktop.login1.Session", "RemoteHost",         bus_property_append_string,   "s",    s->remote_host          },
 244                 { "org.freedesktop.login1.Session", "Service",            bus_property_append_string,   "s",    s->service              },
 245                 { "org.freedesktop.login1.Session", "Leader",             bus_property_append_pid,      "u",    &s->leader              },
 246                 { "org.freedesktop.login1.Session", "Audit",              bus_property_append_uint32,   "u",    &s->audit_id            },
 247                 { "org.freedesktop.login1.Session", "Type",               bus_session_append_type,      "s",    &s->type                },
 248                 { "org.freedesktop.login1.Session", "Active",             bus_session_append_active,    "b",    s                       },
 249                 { "org.freedesktop.login1.Session", "Controllers",        bus_property_append_strv,     "as",   s->controllers          },
 250                 { "org.freedesktop.login1.Session", "ResetControllers",   bus_property_append_strv,     "as",   s->reset_controllers    },
 251                 { "org.freedesktop.login1.Session", "KillProcesses",      bus_property_append_bool,     "b",    &s->kill_processes      },
 252                 { "org.freedesktop.login1.Session", "IdleHint",           bus_session_append_idle_hint, "b",    s                       },
 253                 { "org.freedesktop.login1.Session", "IdleSinceHint",          bus_session_append_idle_hint_since, "t", s                },
 254                 { "org.freedesktop.login1.Session", "IdleSinceHintMonotonic", bus_session_append_idle_hint_since, "t", s                },
 255                 { NULL, NULL, NULL, NULL, NULL }
 256         };
 257
 258         DBusError error;
 259         DBusMessage *reply = NULL;
 260         int r;
 261
 262         assert(s);
 263         assert(connection);
 264         assert(message);
 265
 266         dbus_error_init(&error);
 267
 268         if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Terminate")) {
 269
 270                 r = session_stop(s);
 271                 if (r < 0)
 272                         return bus_send_error_reply(connection, message, NULL, r);
 273
 274                 reply = dbus_message_new_method_return(message);
 275                 if (!reply)
 276                         goto oom;
 277
 278         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Activate")) {
 279
 280                 r = session_activate(s);
 281                 if (r < 0)
 282                         return bus_send_error_reply(connection, message, NULL, r);
 283
 284                 reply = dbus_message_new_method_return(message);
 285                 if (!reply)
 286                         goto oom;
 287
 288         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Lock") ||
 289                    dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Unlock")) {
 290
 291                 if (session_send_signal(s, streq(dbus_message_get_member(message), "Lock")) < 0)
 292                         goto oom;
 293
 294                 reply = dbus_message_new_method_return(message);
 295                 if (!reply)
 296                         goto oom;
 297
 298         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "SetIdleHint")) {
 299                 dbus_bool_t b;
 300                 unsigned long ul;
 301
 302                 if (!dbus_message_get_args(
 303                                     message,
 304                                     &error,
 305                                     DBUS_TYPE_BOOLEAN, &b,
 306                                     DBUS_TYPE_INVALID))
 307                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 308
 309                 ul = dbus_bus_get_unix_user(connection, dbus_message_get_sender(message), &error);
 310                 if (ul == (unsigned long) -1)
 311                         return bus_send_error_reply(connection, message, &error, -EIO);
 312
 313                 if (ul != 0 && ul != s->user->uid)
 314                         return bus_send_error_reply(connection, message, NULL, -EPERM);
 315
 316                 session_set_idle_hint(s, b);
 317
 318                 reply = dbus_message_new_method_return(message);
 319                 if (!reply)
 320                         goto oom;
 321
 322         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Kill")) {
 323                 const char *swho;
 324                 int32_t signo;
 325                 KillWho who;
 326
 327                 if (!dbus_message_get_args(
 328                                     message,
 329                                     &error,
 330                                     DBUS_TYPE_STRING, &swho,
 331                                     DBUS_TYPE_INT32, &signo,
 332                                     DBUS_TYPE_INVALID))
 333                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 334
 335                 if (isempty(swho))
 336                         who = KILL_ALL;
 337                 else {
 338                         who = kill_who_from_string(swho);
 339                         if (who < 0)
 340                                 return bus_send_error_reply(connection, message, &error, -EINVAL);
 341                 }
 342
 343                 if (signo <= 0 || signo >= _NSIG)
 344                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 345
 346                 r = session_kill(s, who, signo);
 347                 if (r < 0)
 348                         return bus_send_error_reply(connection, message, NULL, r);
 349
 350                 reply = dbus_message_new_method_return(message);
 351                 if (!reply)
 352                         goto oom;
 353
 354         } else
 355                 return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, properties);
 356
 357         if (reply) {
 358                 if (!dbus_connection_send(connection, reply, NULL))
 359                         goto oom;
 360
 361                 dbus_message_unref(reply);
 362         }
 363
 364         return DBUS_HANDLER_RESULT_HANDLED;
 365
 366 oom:
 367         if (reply)
 368                 dbus_message_unref(reply);
 369
 370         dbus_error_free(&error);
 371
 372         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 373 }
 374
 375 static DBusHandlerResult session_message_handler(
 376                 DBusConnection *connection,
 377                 DBusMessage *message,
 378                 void *userdata) {
 379
 380         Manager *m = userdata;
 381         Session *s;
 382         int r;
 383
 384         r = get_session_for_path(m, dbus_message_get_path(message), &s);
 385         if (r < 0) {
 386
 387                 if (r == -ENOMEM)
 388                         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 389
 390                 if (r == -ENOENT) {
 391                         DBusError e;
 392
 393                         dbus_error_init(&e);
 394                         dbus_set_error_const(&e, DBUS_ERROR_UNKNOWN_OBJECT, "Unknown session");
 395                         return bus_send_error_reply(connection, message, &e, r);
 396                 }
 397
 398                 return bus_send_error_reply(connection, message, NULL, r);
 399         }
 400
 401         return session_message_dispatch(s, connection, message);
 402 }
 403
 404 const DBusObjectPathVTable bus_session_vtable = {
 405         .message_function = session_message_handler
 406 };
 407
 408 char *session_bus_path(Session *s) {
 409         char *t, *r;
 410
 411         assert(s);
 412
 413         t = bus_path_escape(s->id);
 414         if (!t)
 415                 return NULL;
 416
 417         r = strappend("/org/freedesktop/login1/session/", t);
 418         free(t);
 419
 420         return r;
 421 }
 422
 423 int session_send_signal(Session *s, bool new_session) {
 424         DBusMessage *m;
 425         int r = -ENOMEM;
 426         char *p = NULL;
 427
 428         assert(s);
 429
 430         m = dbus_message_new_signal("/org/freedesktop/login1",
 431                                     "org.freedesktop.login1.Manager",
 432                                     new_session ? "SessionNew" : "SessionRemoved");
 433
 434         if (!m)
 435                 return -ENOMEM;
 436
 437         p = session_bus_path(s);
 438         if (!p)
 439                 goto finish;
 440
 441         if (!dbus_message_append_args(
 442                             m,
 443                             DBUS_TYPE_STRING, &s->id,
 444                             DBUS_TYPE_OBJECT_PATH, &p,
 445                             DBUS_TYPE_INVALID))
 446                 goto finish;
 447
 448         if (!dbus_connection_send(s->manager->bus, m, NULL))
 449                 goto finish;
 450
 451         r = 0;
 452
 453 finish:
 454         dbus_message_unref(m);
 455         free(p);
 456
 457         return r;
 458 }
 459
 460 int session_send_changed(Session *s, const char *properties) {
 461         DBusMessage *m;
 462         int r = -ENOMEM;
 463         char *p = NULL;
 464
 465         assert(s);
 466
 467         if (!s->started)
 468                 return 0;
 469
 470         p = session_bus_path(s);
 471         if (!p)
 472                 return -ENOMEM;
 473
 474         m = bus_properties_changed_new(p, "org.freedesktop.login1.Session", properties);
 475         if (!m)
 476                 goto finish;
 477
 478         if (!dbus_connection_send(s->manager->bus, m, NULL))
 479                 goto finish;
 480
 481         r = 0;
 482
 483 finish:
 484         if (m)
 485                 dbus_message_unref(m);
 486         free(p);
 487
 488         return r;
 489 }
 490
 491 int session_send_lock(Session *s, bool lock) {
 492         DBusMessage *m;
 493         bool b;
 494         char *p;
 495
 496         assert(s);
 497
 498         p = session_bus_path(s);
 499         if (!p)
 500                 return -ENOMEM;
 501
 502         m = dbus_message_new_signal(p, "org.freedesktop.login1.Session", lock ? "Lock" : "Unlock");
 503         free(p);
 504
 505         if (!m)
 506                 return -ENOMEM;
 507
 508         b = dbus_connection_send(s->manager->bus, m, NULL);
 509         dbus_message_unref(m);
 510
 511         if (!b)
 512                 return -ENOMEM;
 513
 514         return 0;
 515 }