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