src/login/logind-user-dbus.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2011 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <errno.h>
  21 #include <string.h>
  22
  23 #include "alloc-util.h"
  24 #include "bus-util.h"
  25 #include "formats-util.h"
  26 #include "logind-user.h"
  27 #include "logind.h"
  28 #include "signal-util.h"
  29 #include "strv.h"
  30 #include "user-util.h"
  31
  32 static int property_get_display(
  33                 sd_bus *bus,
  34                 const char *path,
  35                 const char *interface,
  36                 const char *property,
  37                 sd_bus_message *reply,
  38                 void *userdata,
  39                 sd_bus_error *error) {
  40
  41         _cleanup_free_ char *p = NULL;
  42         User *u = userdata;
  43
  44         assert(bus);
  45         assert(reply);
  46         assert(u);
  47
  48         p = u->display ? session_bus_path(u->display) : strdup("/");
  49         if (!p)
  50                 return -ENOMEM;
  51
  52         return sd_bus_message_append(reply, "(so)", u->display ? u->display->id : "", p);
  53 }
  54
  55 static int property_get_state(
  56                 sd_bus *bus,
  57                 const char *path,
  58                 const char *interface,
  59                 const char *property,
  60                 sd_bus_message *reply,
  61                 void *userdata,
  62                 sd_bus_error *error) {
  63
  64         User *u = userdata;
  65
  66         assert(bus);
  67         assert(reply);
  68         assert(u);
  69
  70         return sd_bus_message_append(reply, "s", user_state_to_string(user_get_state(u)));
  71 }
  72
  73 static int property_get_sessions(
  74                 sd_bus *bus,
  75                 const char *path,
  76                 const char *interface,
  77                 const char *property,
  78                 sd_bus_message *reply,
  79                 void *userdata,
  80                 sd_bus_error *error) {
  81
  82         User *u = userdata;
  83         Session *session;
  84         int r;
  85
  86         assert(bus);
  87         assert(reply);
  88         assert(u);
  89
  90         r = sd_bus_message_open_container(reply, 'a', "(so)");
  91         if (r < 0)
  92                 return r;
  93
  94         LIST_FOREACH(sessions_by_user, session, u->sessions) {
  95                 _cleanup_free_ char *p = NULL;
  96
  97                 p = session_bus_path(session);
  98                 if (!p)
  99                         return -ENOMEM;
 100
 101                 r = sd_bus_message_append(reply, "(so)", session->id, p);
 102                 if (r < 0)
 103                         return r;
 104
 105         }
 106
 107         return sd_bus_message_close_container(reply);
 108 }
 109
 110 static int property_get_idle_hint(
 111                 sd_bus *bus,
 112                 const char *path,
 113                 const char *interface,
 114                 const char *property,
 115                 sd_bus_message *reply,
 116                 void *userdata,
 117                 sd_bus_error *error) {
 118
 119         User *u = userdata;
 120
 121         assert(bus);
 122         assert(reply);
 123         assert(u);
 124
 125         return sd_bus_message_append(reply, "b", user_get_idle_hint(u, NULL) > 0);
 126 }
 127
 128 static int property_get_idle_since_hint(
 129                 sd_bus *bus,
 130                 const char *path,
 131                 const char *interface,
 132                 const char *property,
 133                 sd_bus_message *reply,
 134                 void *userdata,
 135                 sd_bus_error *error) {
 136
 137         User *u = userdata;
 138         dual_timestamp t = DUAL_TIMESTAMP_NULL;
 139         uint64_t k;
 140
 141         assert(bus);
 142         assert(reply);
 143         assert(u);
 144
 145         user_get_idle_hint(u, &t);
 146         k = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 147
 148         return sd_bus_message_append(reply, "t", k);
 149 }
 150
 151 static int property_get_linger(
 152                 sd_bus *bus,
 153                 const char *path,
 154                 const char *interface,
 155                 const char *property,
 156                 sd_bus_message *reply,
 157                 void *userdata,
 158                 sd_bus_error *error) {
 159
 160         User *u = userdata;
 161         int r;
 162
 163         assert(bus);
 164         assert(reply);
 165         assert(u);
 166
 167         r = user_check_linger_file(u);
 168
 169         return sd_bus_message_append(reply, "b", r > 0);
 170 }
 171
 172 int bus_user_method_terminate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 173         User *u = userdata;
 174         int r;
 175
 176         assert(message);
 177         assert(u);
 178
 179         r = bus_verify_polkit_async(
 180                         message,
 181                         CAP_KILL,
 182                         "org.freedesktop.login1.manage",
 183                         NULL,
 184                         false,
 185                         u->uid,
 186                         &u->manager->polkit_registry,
 187                         error);
 188         if (r < 0)
 189                 return r;
 190         if (r == 0)
 191                 return 1; /* Will call us back */
 192
 193         r = user_stop(u, true);
 194         if (r < 0)
 195                 return r;
 196
 197         return sd_bus_reply_method_return(message, NULL);
 198 }
 199
 200 int bus_user_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 201         User *u = userdata;
 202         int32_t signo;
 203         int r;
 204
 205         assert(message);
 206         assert(u);
 207
 208         r = bus_verify_polkit_async(
 209                         message,
 210                         CAP_KILL,
 211                         "org.freedesktop.login1.manage",
 212                         NULL,
 213                         false,
 214                         u->uid,
 215                         &u->manager->polkit_registry,
 216                         error);
 217         if (r < 0)
 218                 return r;
 219         if (r == 0)
 220                 return 1; /* Will call us back */
 221
 222         r = sd_bus_message_read(message, "i", &signo);
 223         if (r < 0)
 224                 return r;
 225
 226         if (!SIGNAL_VALID(signo))
 227                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);
 228
 229         r = user_kill(u, signo);
 230         if (r < 0)
 231                 return r;
 232
 233         return sd_bus_reply_method_return(message, NULL);
 234 }
 235
 236 const sd_bus_vtable user_vtable[] = {
 237         SD_BUS_VTABLE_START(0),
 238
 239         SD_BUS_PROPERTY("UID", "u", bus_property_get_uid, offsetof(User, uid), SD_BUS_VTABLE_PROPERTY_CONST),
 240         SD_BUS_PROPERTY("GID", "u", bus_property_get_gid, offsetof(User, gid), SD_BUS_VTABLE_PROPERTY_CONST),
 241         SD_BUS_PROPERTY("Name", "s", NULL, offsetof(User, name), SD_BUS_VTABLE_PROPERTY_CONST),
 242         BUS_PROPERTY_DUAL_TIMESTAMP("Timestamp", offsetof(User, timestamp), SD_BUS_VTABLE_PROPERTY_CONST),
 243         SD_BUS_PROPERTY("RuntimePath", "s", NULL, offsetof(User, runtime_path), SD_BUS_VTABLE_PROPERTY_CONST),
 244         SD_BUS_PROPERTY("Service", "s", NULL, offsetof(User, service), SD_BUS_VTABLE_PROPERTY_CONST),
 245         SD_BUS_PROPERTY("Slice", "s", NULL, offsetof(User, slice), SD_BUS_VTABLE_PROPERTY_CONST),
 246         SD_BUS_PROPERTY("Display", "(so)", property_get_display, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 247         SD_BUS_PROPERTY("State", "s", property_get_state, 0, 0),
 248         SD_BUS_PROPERTY("Sessions", "a(so)", property_get_sessions, 0, 0),
 249         SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 250         SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 251         SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 252         SD_BUS_PROPERTY("Linger", "b", property_get_linger, 0, 0),
 253
 254         SD_BUS_METHOD("Terminate", NULL, NULL, bus_user_method_terminate, SD_BUS_VTABLE_UNPRIVILEGED),
 255         SD_BUS_METHOD("Kill", "i", NULL, bus_user_method_kill, SD_BUS_VTABLE_UNPRIVILEGED),
 256
 257         SD_BUS_VTABLE_END
 258 };
 259
 260 int user_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
 261         Manager *m = userdata;
 262         uid_t uid;
 263         User *user;
 264         int r;
 265
 266         assert(bus);
 267         assert(path);
 268         assert(interface);
 269         assert(found);
 270         assert(m);
 271
 272         if (streq(path, "/org/freedesktop/login1/user/self")) {
 273                 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 274                 sd_bus_message *message;
 275
 276                 message = sd_bus_get_current_message(bus);
 277                 if (!message)
 278                         return 0;
 279
 280                 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_OWNER_UID|SD_BUS_CREDS_AUGMENT, &creds);
 281                 if (r < 0)
 282                         return r;
 283
 284                 r = sd_bus_creds_get_owner_uid(creds, &uid);
 285         } else {
 286                 const char *p;
 287
 288                 p = startswith(path, "/org/freedesktop/login1/user/_");
 289                 if (!p)
 290                         return 0;
 291
 292                 r = parse_uid(p, &uid);
 293         }
 294         if (r < 0)
 295                 return 0;
 296
 297         user = hashmap_get(m->users, UID_TO_PTR(uid));
 298         if (!user)
 299                 return 0;
 300
 301         *found = user;
 302         return 1;
 303 }
 304
 305 char *user_bus_path(User *u) {
 306         char *s;
 307
 308         assert(u);
 309
 310         if (asprintf(&s, "/org/freedesktop/login1/user/_"UID_FMT, u->uid) < 0)
 311                 return NULL;
 312
 313         return s;
 314 }
 315
 316 int user_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
 317         _cleanup_strv_free_ char **l = NULL;
 318         sd_bus_message *message;
 319         Manager *m = userdata;
 320         User *user;
 321         Iterator i;
 322         int r;
 323
 324         assert(bus);
 325         assert(path);
 326         assert(nodes);
 327
 328         HASHMAP_FOREACH(user, m->users, i) {
 329                 char *p;
 330
 331                 p = user_bus_path(user);
 332                 if (!p)
 333                         return -ENOMEM;
 334
 335                 r = strv_consume(&l, p);
 336                 if (r < 0)
 337                         return r;
 338         }
 339
 340         message = sd_bus_get_current_message(bus);
 341         if (message) {
 342                 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 343                 uid_t uid;
 344
 345                 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_OWNER_UID|SD_BUS_CREDS_AUGMENT, &creds);
 346                 if (r >= 0) {
 347                         r = sd_bus_creds_get_owner_uid(creds, &uid);
 348                         if (r >= 0) {
 349                                 user = hashmap_get(m->users, UID_TO_PTR(uid));
 350                                 if (user) {
 351                                         r = strv_extend(&l, "/org/freedesktop/login1/user/self");
 352                                         if (r < 0)
 353                                                 return r;
 354                                 }
 355                         }
 356                 }
 357         }
 358
 359         *nodes = l;
 360         l = NULL;
 361
 362         return 1;
 363 }
 364
 365 int user_send_signal(User *u, bool new_user) {
 366         _cleanup_free_ char *p = NULL;
 367
 368         assert(u);
 369
 370         p = user_bus_path(u);
 371         if (!p)
 372                 return -ENOMEM;
 373
 374         return sd_bus_emit_signal(
 375                         u->manager->bus,
 376                         "/org/freedesktop/login1",
 377                         "org.freedesktop.login1.Manager",
 378                         new_user ? "UserNew" : "UserRemoved",
 379                         "uo", (uint32_t) u->uid, p);
 380 }
 381
 382 int user_send_changed(User *u, const char *properties, ...) {
 383         _cleanup_free_ char *p = NULL;
 384         char **l;
 385
 386         assert(u);
 387
 388         if (!u->started)
 389                 return 0;
 390
 391         p = user_bus_path(u);
 392         if (!p)
 393                 return -ENOMEM;
 394
 395         l = strv_from_stdarg_alloca(properties);
 396
 397         return sd_bus_emit_properties_changed_strv(u->manager->bus, p, "org.freedesktop.login1.User", l);
 398 }