src/login/logind-user-dbus.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <errno.h>
   4
   5 #include "alloc-util.h"
   6 #include "bus-get-properties.h"
   7 #include "bus-polkit.h"
   8 #include "bus-util.h"
   9 #include "format-util.h"
  10 #include "logind-dbus.h"
  11 #include "logind-session-dbus.h"
  12 #include "logind-user-dbus.h"
  13 #include "logind-user.h"
  14 #include "logind.h"
  15 #include "missing_capability.h"
  16 #include "signal-util.h"
  17 #include "strv.h"
  18 #include "user-util.h"
  19
  20 static int property_get_uid(
  21                 sd_bus *bus,
  22                 const char *path,
  23                 const char *interface,
  24                 const char *property,
  25                 sd_bus_message *reply,
  26                 void *userdata,
  27                 sd_bus_error *error) {
  28
  29         User *u = userdata;
  30
  31         assert(bus);
  32         assert(reply);
  33         assert(u);
  34
  35         return sd_bus_message_append(reply, "u", (uint32_t) u->user_record->uid);
  36 }
  37
  38 static int property_get_gid(
  39                 sd_bus *bus,
  40                 const char *path,
  41                 const char *interface,
  42                 const char *property,
  43                 sd_bus_message *reply,
  44                 void *userdata,
  45                 sd_bus_error *error) {
  46
  47         User *u = userdata;
  48
  49         assert(bus);
  50         assert(reply);
  51         assert(u);
  52
  53         return sd_bus_message_append(reply, "u", (uint32_t) u->user_record->gid);
  54 }
  55
  56 static int property_get_name(
  57                 sd_bus *bus,
  58                 const char *path,
  59                 const char *interface,
  60                 const char *property,
  61                 sd_bus_message *reply,
  62                 void *userdata,
  63                 sd_bus_error *error) {
  64
  65         User *u = userdata;
  66
  67         assert(bus);
  68         assert(reply);
  69         assert(u);
  70
  71         return sd_bus_message_append(reply, "s", u->user_record->user_name);
  72 }
  73
  74 static BUS_DEFINE_PROPERTY_GET2(property_get_state, "s", User, user_get_state, user_state_to_string);
  75
  76 static int property_get_display(
  77                 sd_bus *bus,
  78                 const char *path,
  79                 const char *interface,
  80                 const char *property,
  81                 sd_bus_message *reply,
  82                 void *userdata,
  83                 sd_bus_error *error) {
  84
  85         _cleanup_free_ char *p = NULL;
  86         User *u = userdata;
  87
  88         assert(bus);
  89         assert(reply);
  90         assert(u);
  91
  92         p = u->display ? session_bus_path(u->display) : strdup("/");
  93         if (!p)
  94                 return -ENOMEM;
  95
  96         return sd_bus_message_append(reply, "(so)", u->display ? u->display->id : "", p);
  97 }
  98
  99 static int property_get_sessions(
 100                 sd_bus *bus,
 101                 const char *path,
 102                 const char *interface,
 103                 const char *property,
 104                 sd_bus_message *reply,
 105                 void *userdata,
 106                 sd_bus_error *error) {
 107
 108         User *u = userdata;
 109         Session *session;
 110         int r;
 111
 112         assert(bus);
 113         assert(reply);
 114         assert(u);
 115
 116         r = sd_bus_message_open_container(reply, 'a', "(so)");
 117         if (r < 0)
 118                 return r;
 119
 120         LIST_FOREACH(sessions_by_user, session, u->sessions) {
 121                 _cleanup_free_ char *p = NULL;
 122
 123                 p = session_bus_path(session);
 124                 if (!p)
 125                         return -ENOMEM;
 126
 127                 r = sd_bus_message_append(reply, "(so)", session->id, p);
 128                 if (r < 0)
 129                         return r;
 130
 131         }
 132
 133         return sd_bus_message_close_container(reply);
 134 }
 135
 136 static int property_get_idle_hint(
 137                 sd_bus *bus,
 138                 const char *path,
 139                 const char *interface,
 140                 const char *property,
 141                 sd_bus_message *reply,
 142                 void *userdata,
 143                 sd_bus_error *error) {
 144
 145         User *u = userdata;
 146
 147         assert(bus);
 148         assert(reply);
 149         assert(u);
 150
 151         return sd_bus_message_append(reply, "b", user_get_idle_hint(u, NULL) > 0);
 152 }
 153
 154 static int property_get_idle_since_hint(
 155                 sd_bus *bus,
 156                 const char *path,
 157                 const char *interface,
 158                 const char *property,
 159                 sd_bus_message *reply,
 160                 void *userdata,
 161                 sd_bus_error *error) {
 162
 163         User *u = userdata;
 164         dual_timestamp t = DUAL_TIMESTAMP_NULL;
 165         uint64_t k;
 166
 167         assert(bus);
 168         assert(reply);
 169         assert(u);
 170
 171         (void) user_get_idle_hint(u, &t);
 172         k = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 173
 174         return sd_bus_message_append(reply, "t", k);
 175 }
 176
 177 static int property_get_linger(
 178                 sd_bus *bus,
 179                 const char *path,
 180                 const char *interface,
 181                 const char *property,
 182                 sd_bus_message *reply,
 183                 void *userdata,
 184                 sd_bus_error *error) {
 185
 186         User *u = userdata;
 187         int r;
 188
 189         assert(bus);
 190         assert(reply);
 191         assert(u);
 192
 193         r = user_check_linger_file(u);
 194
 195         return sd_bus_message_append(reply, "b", r > 0);
 196 }
 197
 198 int bus_user_method_terminate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 199         User *u = userdata;
 200         int r;
 201
 202         assert(message);
 203         assert(u);
 204
 205         r = bus_verify_polkit_async(
 206                         message,
 207                         CAP_KILL,
 208                         "org.freedesktop.login1.manage",
 209                         NULL,
 210                         false,
 211                         u->user_record->uid,
 212                         &u->manager->polkit_registry,
 213                         error);
 214         if (r < 0)
 215                 return r;
 216         if (r == 0)
 217                 return 1; /* Will call us back */
 218
 219         r = user_stop(u, /* force */ true);
 220         if (r < 0)
 221                 return r;
 222
 223         return sd_bus_reply_method_return(message, NULL);
 224 }
 225
 226 int bus_user_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 227         User *u = userdata;
 228         int32_t signo;
 229         int r;
 230
 231         assert(message);
 232         assert(u);
 233
 234         r = bus_verify_polkit_async(
 235                         message,
 236                         CAP_KILL,
 237                         "org.freedesktop.login1.manage",
 238                         NULL,
 239                         false,
 240                         u->user_record->uid,
 241                         &u->manager->polkit_registry,
 242                         error);
 243         if (r < 0)
 244                 return r;
 245         if (r == 0)
 246                 return 1; /* Will call us back */
 247
 248         r = sd_bus_message_read(message, "i", &signo);
 249         if (r < 0)
 250                 return r;
 251
 252         if (!SIGNAL_VALID(signo))
 253                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);
 254
 255         r = user_kill(u, signo);
 256         if (r < 0)
 257                 return r;
 258
 259         return sd_bus_reply_method_return(message, NULL);
 260 }
 261
 262 static int user_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
 263         Manager *m = userdata;
 264         uid_t uid;
 265         User *user;
 266         int r;
 267
 268         assert(bus);
 269         assert(path);
 270         assert(interface);
 271         assert(found);
 272         assert(m);
 273
 274         if (streq(path, "/org/freedesktop/login1/user/self")) {
 275                 sd_bus_message *message;
 276
 277                 message = sd_bus_get_current_message(bus);
 278
 279                 r = manager_get_user_from_creds(m, message, UID_INVALID, error, &user);
 280                 if (r == -ENXIO) {
 281                         sd_bus_error_free(error);
 282                         return 0;
 283                 }
 284                 if (r < 0)
 285                         return r;
 286         } else {
 287                 const char *p;
 288
 289                 p = startswith(path, "/org/freedesktop/login1/user/_");
 290                 if (!p)
 291                         return 0;
 292
 293                 r = parse_uid(p, &uid);
 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
 302         *found = user;
 303         return 1;
 304 }
 305
 306 char *user_bus_path(User *u) {
 307         char *s;
 308
 309         assert(u);
 310
 311         if (asprintf(&s, "/org/freedesktop/login1/user/_"UID_FMT, u->user_record->uid) < 0)
 312                 return NULL;
 313
 314         return s;
 315 }
 316
 317 static int user_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
 318         _cleanup_strv_free_ char **l = NULL;
 319         sd_bus_message *message;
 320         Manager *m = userdata;
 321         User *user;
 322         int r;
 323
 324         assert(bus);
 325         assert(path);
 326         assert(nodes);
 327
 328         HASHMAP_FOREACH(user, m->users) {
 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 }