src/login/logind-user-dbus.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4
   5 #include "alloc-util.h"
   6 #include "bus-polkit.h"
   7 #include "bus-util.h"
   8 #include "format-util.h"
   9 #include "logind-dbus.h"
  10 #include "logind-session-dbus.h"
  11 #include "logind-user-dbus.h"
  12 #include "logind-user.h"
  13 #include "logind.h"
  14 #include "missing_capability.h"
  15 #include "signal-util.h"
  16 #include "strv.h"
  17 #include "user-util.h"
  18
  19 static int property_get_uid(
  20                 sd_bus *bus,
  21                 const char *path,
  22                 const char *interface,
  23                 const char *property,
  24                 sd_bus_message *reply,
  25                 void *userdata,
  26                 sd_bus_error *error) {
  27
  28         User *u = userdata;
  29
  30         assert(bus);
  31         assert(reply);
  32         assert(u);
  33
  34         return sd_bus_message_append(reply, "u", (uint32_t) u->user_record->uid);
  35 }
  36
  37 static int property_get_gid(
  38                 sd_bus *bus,
  39                 const char *path,
  40                 const char *interface,
  41                 const char *property,
  42                 sd_bus_message *reply,
  43                 void *userdata,
  44                 sd_bus_error *error) {
  45
  46         User *u = userdata;
  47
  48         assert(bus);
  49         assert(reply);
  50         assert(u);
  51
  52         return sd_bus_message_append(reply, "u", (uint32_t) u->user_record->gid);
  53 }
  54
  55 static int property_get_name(
  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", u->user_record->user_name);
  71 }
  72
  73 static BUS_DEFINE_PROPERTY_GET2(property_get_state, "s", User, user_get_state, user_state_to_string);
  74
  75 static int property_get_display(
  76                 sd_bus *bus,
  77                 const char *path,
  78                 const char *interface,
  79                 const char *property,
  80                 sd_bus_message *reply,
  81                 void *userdata,
  82                 sd_bus_error *error) {
  83
  84         _cleanup_free_ char *p = NULL;
  85         User *u = userdata;
  86
  87         assert(bus);
  88         assert(reply);
  89         assert(u);
  90
  91         p = u->display ? session_bus_path(u->display) : strdup("/");
  92         if (!p)
  93                 return -ENOMEM;
  94
  95         return sd_bus_message_append(reply, "(so)", u->display ? u->display->id : "", p);
  96 }
  97
  98 static int property_get_sessions(
  99                 sd_bus *bus,
 100                 const char *path,
 101                 const char *interface,
 102                 const char *property,
 103                 sd_bus_message *reply,
 104                 void *userdata,
 105                 sd_bus_error *error) {
 106
 107         User *u = userdata;
 108         Session *session;
 109         int r;
 110
 111         assert(bus);
 112         assert(reply);
 113         assert(u);
 114
 115         r = sd_bus_message_open_container(reply, 'a', "(so)");
 116         if (r < 0)
 117                 return r;
 118
 119         LIST_FOREACH(sessions_by_user, session, u->sessions) {
 120                 _cleanup_free_ char *p = NULL;
 121
 122                 p = session_bus_path(session);
 123                 if (!p)
 124                         return -ENOMEM;
 125
 126                 r = sd_bus_message_append(reply, "(so)", session->id, p);
 127                 if (r < 0)
 128                         return r;
 129
 130         }
 131
 132         return sd_bus_message_close_container(reply);
 133 }
 134
 135 static int property_get_idle_hint(
 136                 sd_bus *bus,
 137                 const char *path,
 138                 const char *interface,
 139                 const char *property,
 140                 sd_bus_message *reply,
 141                 void *userdata,
 142                 sd_bus_error *error) {
 143
 144         User *u = userdata;
 145
 146         assert(bus);
 147         assert(reply);
 148         assert(u);
 149
 150         return sd_bus_message_append(reply, "b", user_get_idle_hint(u, NULL) > 0);
 151 }
 152
 153 static int property_get_idle_since_hint(
 154                 sd_bus *bus,
 155                 const char *path,
 156                 const char *interface,
 157                 const char *property,
 158                 sd_bus_message *reply,
 159                 void *userdata,
 160                 sd_bus_error *error) {
 161
 162         User *u = userdata;
 163         dual_timestamp t = DUAL_TIMESTAMP_NULL;
 164         uint64_t k;
 165
 166         assert(bus);
 167         assert(reply);
 168         assert(u);
 169
 170         (void) user_get_idle_hint(u, &t);
 171         k = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 172
 173         return sd_bus_message_append(reply, "t", k);
 174 }
 175
 176 static int property_get_linger(
 177                 sd_bus *bus,
 178                 const char *path,
 179                 const char *interface,
 180                 const char *property,
 181                 sd_bus_message *reply,
 182                 void *userdata,
 183                 sd_bus_error *error) {
 184
 185         User *u = userdata;
 186         int r;
 187
 188         assert(bus);
 189         assert(reply);
 190         assert(u);
 191
 192         r = user_check_linger_file(u);
 193
 194         return sd_bus_message_append(reply, "b", r > 0);
 195 }
 196
 197 int bus_user_method_terminate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 198         User *u = userdata;
 199         int r;
 200
 201         assert(message);
 202         assert(u);
 203
 204         r = bus_verify_polkit_async(
 205                         message,
 206                         CAP_KILL,
 207                         "org.freedesktop.login1.manage",
 208                         NULL,
 209                         false,
 210                         u->user_record->uid,
 211                         &u->manager->polkit_registry,
 212                         error);
 213         if (r < 0)
 214                 return r;
 215         if (r == 0)
 216                 return 1; /* Will call us back */
 217
 218         r = user_stop(u, true);
 219         if (r < 0)
 220                 return r;
 221
 222         return sd_bus_reply_method_return(message, NULL);
 223 }
 224
 225 int bus_user_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 226         User *u = userdata;
 227         int32_t signo;
 228         int r;
 229
 230         assert(message);
 231         assert(u);
 232
 233         r = bus_verify_polkit_async(
 234                         message,
 235                         CAP_KILL,
 236                         "org.freedesktop.login1.manage",
 237                         NULL,
 238                         false,
 239                         u->user_record->uid,
 240                         &u->manager->polkit_registry,
 241                         error);
 242         if (r < 0)
 243                 return r;
 244         if (r == 0)
 245                 return 1; /* Will call us back */
 246
 247         r = sd_bus_message_read(message, "i", &signo);
 248         if (r < 0)
 249                 return r;
 250
 251         if (!SIGNAL_VALID(signo))
 252                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);
 253
 254         r = user_kill(u, signo);
 255         if (r < 0)
 256                 return r;
 257
 258         return sd_bus_reply_method_return(message, NULL);
 259 }
 260
 261 static int user_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
 262         Manager *m = userdata;
 263         uid_t uid;
 264         User *user;
 265         int r;
 266
 267         assert(bus);
 268         assert(path);
 269         assert(interface);
 270         assert(found);
 271         assert(m);
 272
 273         if (streq(path, "/org/freedesktop/login1/user/self")) {
 274                 sd_bus_message *message;
 275
 276                 message = sd_bus_get_current_message(bus);
 277
 278                 r = manager_get_user_from_creds(m, message, UID_INVALID, error, &user);
 279                 if (r == -ENXIO) {
 280                         sd_bus_error_free(error);
 281                         return 0;
 282                 }
 283                 if (r < 0)
 284                         return r;
 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                 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
 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->user_record->uid) < 0)
 311                 return NULL;
 312
 313         return s;
 314 }
 315
 316 static 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
 344                 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_OWNER_UID|SD_BUS_CREDS_AUGMENT, &creds);
 345                 if (r >= 0) {
 346                         uid_t uid;
 347
 348                         r = sd_bus_creds_get_owner_uid(creds, &uid);
 349                         if (r >= 0) {
 350                                 user = hashmap_get(m->users, UID_TO_PTR(uid));
 351                                 if (user) {
 352                                         r = strv_extend(&l, "/org/freedesktop/login1/user/self");
 353                                         if (r < 0)
 354                                                 return r;
 355                                 }
 356                         }
 357                 }
 358         }
 359
 360         *nodes = TAKE_PTR(l);
 361
 362         return 1;
 363 }
 364
 365 static const sd_bus_vtable user_vtable[] = {
 366         SD_BUS_VTABLE_START(0),
 367
 368         SD_BUS_PROPERTY("UID", "u", property_get_uid, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 369         SD_BUS_PROPERTY("GID", "u", property_get_gid, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 370         SD_BUS_PROPERTY("Name", "s", property_get_name, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 371         BUS_PROPERTY_DUAL_TIMESTAMP("Timestamp", offsetof(User, timestamp), SD_BUS_VTABLE_PROPERTY_CONST),
 372         SD_BUS_PROPERTY("RuntimePath", "s", NULL, offsetof(User, runtime_path), SD_BUS_VTABLE_PROPERTY_CONST),
 373         SD_BUS_PROPERTY("Service", "s", NULL, offsetof(User, service), SD_BUS_VTABLE_PROPERTY_CONST),
 374         SD_BUS_PROPERTY("Slice", "s", NULL, offsetof(User, slice), SD_BUS_VTABLE_PROPERTY_CONST),
 375         SD_BUS_PROPERTY("Display", "(so)", property_get_display, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 376         SD_BUS_PROPERTY("State", "s", property_get_state, 0, 0),
 377         SD_BUS_PROPERTY("Sessions", "a(so)", property_get_sessions, 0, 0),
 378         SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 379         SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 380         SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 381         SD_BUS_PROPERTY("Linger", "b", property_get_linger, 0, 0),
 382
 383         SD_BUS_METHOD("Terminate", NULL, NULL, bus_user_method_terminate, SD_BUS_VTABLE_UNPRIVILEGED),
 384         SD_BUS_METHOD_WITH_NAMES("Kill",
 385                                  "i",
 386                                  SD_BUS_PARAM(signal_number),
 387                                  NULL,,
 388                                  bus_user_method_kill,
 389                                  SD_BUS_VTABLE_UNPRIVILEGED),
 390
 391         SD_BUS_VTABLE_END
 392 };
 393
 394 const BusObjectImplementation user_object = {
 395         "/org/freedesktop/login1/user",
 396         "org.freedesktop.login1.User",
 397         .fallback_vtables = BUS_FALLBACK_VTABLES({user_vtable, user_object_find}),
 398         .node_enumerator = user_node_enumerator,
 399 };
 400
 401 int user_send_signal(User *u, bool new_user) {
 402         _cleanup_free_ char *p = NULL;
 403
 404         assert(u);
 405
 406         p = user_bus_path(u);
 407         if (!p)
 408                 return -ENOMEM;
 409
 410         return sd_bus_emit_signal(
 411                         u->manager->bus,
 412                         "/org/freedesktop/login1",
 413                         "org.freedesktop.login1.Manager",
 414                         new_user ? "UserNew" : "UserRemoved",
 415                         "uo", (uint32_t) u->user_record->uid, p);
 416 }
 417
 418 int user_send_changed(User *u, const char *properties, ...) {
 419         _cleanup_free_ char *p = NULL;
 420         char **l;
 421
 422         assert(u);
 423
 424         if (!u->started)
 425                 return 0;
 426
 427         p = user_bus_path(u);
 428         if (!p)
 429                 return -ENOMEM;
 430
 431         l = strv_from_stdarg_alloca(properties);
 432
 433         return sd_bus_emit_properties_changed_strv(u->manager->bus, p, "org.freedesktop.login1.User", l);
 434 }