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-util.h"
   7 #include "format-util.h"
   8 #include "logind-dbus.h"
   9 #include "logind-session-dbus.h"
  10 #include "logind-user-dbus.h"
  11 #include "logind-user.h"
  12 #include "logind.h"
  13 #include "missing_capability.h"
  14 #include "signal-util.h"
  15 #include "strv.h"
  16 #include "user-util.h"
  17
  18 static BUS_DEFINE_PROPERTY_GET2(property_get_state, "s", User, user_get_state, user_state_to_string);
  19
  20 static int property_get_display(
  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         _cleanup_free_ char *p = NULL;
  30         User *u = userdata;
  31
  32         assert(bus);
  33         assert(reply);
  34         assert(u);
  35
  36         p = u->display ? session_bus_path(u->display) : strdup("/");
  37         if (!p)
  38                 return -ENOMEM;
  39
  40         return sd_bus_message_append(reply, "(so)", u->display ? u->display->id : "", p);
  41 }
  42
  43 static int property_get_sessions(
  44                 sd_bus *bus,
  45                 const char *path,
  46                 const char *interface,
  47                 const char *property,
  48                 sd_bus_message *reply,
  49                 void *userdata,
  50                 sd_bus_error *error) {
  51
  52         User *u = userdata;
  53         Session *session;
  54         int r;
  55
  56         assert(bus);
  57         assert(reply);
  58         assert(u);
  59
  60         r = sd_bus_message_open_container(reply, 'a', "(so)");
  61         if (r < 0)
  62                 return r;
  63
  64         LIST_FOREACH(sessions_by_user, session, u->sessions) {
  65                 _cleanup_free_ char *p = NULL;
  66
  67                 p = session_bus_path(session);
  68                 if (!p)
  69                         return -ENOMEM;
  70
  71                 r = sd_bus_message_append(reply, "(so)", session->id, p);
  72                 if (r < 0)
  73                         return r;
  74
  75         }
  76
  77         return sd_bus_message_close_container(reply);
  78 }
  79
  80 static int property_get_idle_hint(
  81                 sd_bus *bus,
  82                 const char *path,
  83                 const char *interface,
  84                 const char *property,
  85                 sd_bus_message *reply,
  86                 void *userdata,
  87                 sd_bus_error *error) {
  88
  89         User *u = userdata;
  90
  91         assert(bus);
  92         assert(reply);
  93         assert(u);
  94
  95         return sd_bus_message_append(reply, "b", user_get_idle_hint(u, NULL) > 0);
  96 }
  97
  98 static int property_get_idle_since_hint(
  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         dual_timestamp t = DUAL_TIMESTAMP_NULL;
 109         uint64_t k;
 110
 111         assert(bus);
 112         assert(reply);
 113         assert(u);
 114
 115         (void) user_get_idle_hint(u, &t);
 116         k = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 117
 118         return sd_bus_message_append(reply, "t", k);
 119 }
 120
 121 static int property_get_linger(
 122                 sd_bus *bus,
 123                 const char *path,
 124                 const char *interface,
 125                 const char *property,
 126                 sd_bus_message *reply,
 127                 void *userdata,
 128                 sd_bus_error *error) {
 129
 130         User *u = userdata;
 131         int r;
 132
 133         assert(bus);
 134         assert(reply);
 135         assert(u);
 136
 137         r = user_check_linger_file(u);
 138
 139         return sd_bus_message_append(reply, "b", r > 0);
 140 }
 141
 142 int bus_user_method_terminate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 143         User *u = userdata;
 144         int r;
 145
 146         assert(message);
 147         assert(u);
 148
 149         r = bus_verify_polkit_async(
 150                         message,
 151                         CAP_KILL,
 152                         "org.freedesktop.login1.manage",
 153                         NULL,
 154                         false,
 155                         u->uid,
 156                         &u->manager->polkit_registry,
 157                         error);
 158         if (r < 0)
 159                 return r;
 160         if (r == 0)
 161                 return 1; /* Will call us back */
 162
 163         r = user_stop(u, true);
 164         if (r < 0)
 165                 return r;
 166
 167         return sd_bus_reply_method_return(message, NULL);
 168 }
 169
 170 int bus_user_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 171         User *u = userdata;
 172         int32_t signo;
 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 = sd_bus_message_read(message, "i", &signo);
 193         if (r < 0)
 194                 return r;
 195
 196         if (!SIGNAL_VALID(signo))
 197                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);
 198
 199         r = user_kill(u, signo);
 200         if (r < 0)
 201                 return r;
 202
 203         return sd_bus_reply_method_return(message, NULL);
 204 }
 205
 206 const sd_bus_vtable user_vtable[] = {
 207         SD_BUS_VTABLE_START(0),
 208
 209         SD_BUS_PROPERTY("UID", "u", bus_property_get_uid, offsetof(User, uid), SD_BUS_VTABLE_PROPERTY_CONST),
 210         SD_BUS_PROPERTY("GID", "u", bus_property_get_gid, offsetof(User, gid), SD_BUS_VTABLE_PROPERTY_CONST),
 211         SD_BUS_PROPERTY("Name", "s", NULL, offsetof(User, name), SD_BUS_VTABLE_PROPERTY_CONST),
 212         BUS_PROPERTY_DUAL_TIMESTAMP("Timestamp", offsetof(User, timestamp), SD_BUS_VTABLE_PROPERTY_CONST),
 213         SD_BUS_PROPERTY("RuntimePath", "s", NULL, offsetof(User, runtime_path), SD_BUS_VTABLE_PROPERTY_CONST),
 214         SD_BUS_PROPERTY("Service", "s", NULL, offsetof(User, service), SD_BUS_VTABLE_PROPERTY_CONST),
 215         SD_BUS_PROPERTY("Slice", "s", NULL, offsetof(User, slice), SD_BUS_VTABLE_PROPERTY_CONST),
 216         SD_BUS_PROPERTY("Display", "(so)", property_get_display, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 217         SD_BUS_PROPERTY("State", "s", property_get_state, 0, 0),
 218         SD_BUS_PROPERTY("Sessions", "a(so)", property_get_sessions, 0, 0),
 219         SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 220         SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 221         SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 222         SD_BUS_PROPERTY("Linger", "b", property_get_linger, 0, 0),
 223
 224         SD_BUS_METHOD("Terminate", NULL, NULL, bus_user_method_terminate, SD_BUS_VTABLE_UNPRIVILEGED),
 225         SD_BUS_METHOD("Kill", "i", NULL, bus_user_method_kill, SD_BUS_VTABLE_UNPRIVILEGED),
 226
 227         SD_BUS_VTABLE_END
 228 };
 229
 230 int user_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
 231         Manager *m = userdata;
 232         uid_t uid;
 233         User *user;
 234         int r;
 235
 236         assert(bus);
 237         assert(path);
 238         assert(interface);
 239         assert(found);
 240         assert(m);
 241
 242         if (streq(path, "/org/freedesktop/login1/user/self")) {
 243                 sd_bus_message *message;
 244
 245                 message = sd_bus_get_current_message(bus);
 246
 247                 r = manager_get_user_from_creds(m, message, UID_INVALID, error, &user);
 248                 if (r == -ENXIO) {
 249                         sd_bus_error_free(error);
 250                         return 0;
 251                 }
 252                 if (r < 0)
 253                         return r;
 254         } else {
 255                 const char *p;
 256
 257                 p = startswith(path, "/org/freedesktop/login1/user/_");
 258                 if (!p)
 259                         return 0;
 260
 261                 r = parse_uid(p, &uid);
 262                 if (r < 0)
 263                         return 0;
 264
 265                 user = hashmap_get(m->users, UID_TO_PTR(uid));
 266                 if (!user)
 267                         return 0;
 268         }
 269
 270         *found = user;
 271         return 1;
 272 }
 273
 274 char *user_bus_path(User *u) {
 275         char *s;
 276
 277         assert(u);
 278
 279         if (asprintf(&s, "/org/freedesktop/login1/user/_"UID_FMT, u->uid) < 0)
 280                 return NULL;
 281
 282         return s;
 283 }
 284
 285 int user_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
 286         _cleanup_strv_free_ char **l = NULL;
 287         sd_bus_message *message;
 288         Manager *m = userdata;
 289         User *user;
 290         Iterator i;
 291         int r;
 292
 293         assert(bus);
 294         assert(path);
 295         assert(nodes);
 296
 297         HASHMAP_FOREACH(user, m->users, i) {
 298                 char *p;
 299
 300                 p = user_bus_path(user);
 301                 if (!p)
 302                         return -ENOMEM;
 303
 304                 r = strv_consume(&l, p);
 305                 if (r < 0)
 306                         return r;
 307         }
 308
 309         message = sd_bus_get_current_message(bus);
 310         if (message) {
 311                 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 312
 313                 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_OWNER_UID|SD_BUS_CREDS_AUGMENT, &creds);
 314                 if (r >= 0) {
 315                         uid_t uid;
 316
 317                         r = sd_bus_creds_get_owner_uid(creds, &uid);
 318                         if (r >= 0) {
 319                                 user = hashmap_get(m->users, UID_TO_PTR(uid));
 320                                 if (user) {
 321                                         r = strv_extend(&l, "/org/freedesktop/login1/user/self");
 322                                         if (r < 0)
 323                                                 return r;
 324                                 }
 325                         }
 326                 }
 327         }
 328
 329         *nodes = TAKE_PTR(l);
 330
 331         return 1;
 332 }
 333
 334 int user_send_signal(User *u, bool new_user) {
 335         _cleanup_free_ char *p = NULL;
 336
 337         assert(u);
 338
 339         p = user_bus_path(u);
 340         if (!p)
 341                 return -ENOMEM;
 342
 343         return sd_bus_emit_signal(
 344                         u->manager->bus,
 345                         "/org/freedesktop/login1",
 346                         "org.freedesktop.login1.Manager",
 347                         new_user ? "UserNew" : "UserRemoved",
 348                         "uo", (uint32_t) u->uid, p);
 349 }
 350
 351 int user_send_changed(User *u, const char *properties, ...) {
 352         _cleanup_free_ char *p = NULL;
 353         char **l;
 354
 355         assert(u);
 356
 357         if (!u->started)
 358                 return 0;
 359
 360         p = user_bus_path(u);
 361         if (!p)
 362                 return -ENOMEM;
 363
 364         l = strv_from_stdarg_alloca(properties);
 365
 366         return sd_bus_emit_properties_changed_strv(u->manager->bus, p, "org.freedesktop.login1.User", l);
 367 }