src/login/logind-user-dbus.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4 #include <string.h>
   5
   6 #include "alloc-util.h"
   7 #include "bus-util.h"
   8 #include "format-util.h"
   9 #include "logind-user.h"
  10 #include "logind.h"
  11 #include "signal-util.h"
  12 #include "strv.h"
  13 #include "user-util.h"
  14
  15 static BUS_DEFINE_PROPERTY_GET2(property_get_state, "s", User, user_get_state, user_state_to_string);
  16
  17 static int property_get_display(
  18                 sd_bus *bus,
  19                 const char *path,
  20                 const char *interface,
  21                 const char *property,
  22                 sd_bus_message *reply,
  23                 void *userdata,
  24                 sd_bus_error *error) {
  25
  26         _cleanup_free_ char *p = NULL;
  27         User *u = userdata;
  28
  29         assert(bus);
  30         assert(reply);
  31         assert(u);
  32
  33         p = u->display ? session_bus_path(u->display) : strdup("/");
  34         if (!p)
  35                 return -ENOMEM;
  36
  37         return sd_bus_message_append(reply, "(so)", u->display ? u->display->id : "", p);
  38 }
  39
  40 static int property_get_sessions(
  41                 sd_bus *bus,
  42                 const char *path,
  43                 const char *interface,
  44                 const char *property,
  45                 sd_bus_message *reply,
  46                 void *userdata,
  47                 sd_bus_error *error) {
  48
  49         User *u = userdata;
  50         Session *session;
  51         int r;
  52
  53         assert(bus);
  54         assert(reply);
  55         assert(u);
  56
  57         r = sd_bus_message_open_container(reply, 'a', "(so)");
  58         if (r < 0)
  59                 return r;
  60
  61         LIST_FOREACH(sessions_by_user, session, u->sessions) {
  62                 _cleanup_free_ char *p = NULL;
  63
  64                 p = session_bus_path(session);
  65                 if (!p)
  66                         return -ENOMEM;
  67
  68                 r = sd_bus_message_append(reply, "(so)", session->id, p);
  69                 if (r < 0)
  70                         return r;
  71
  72         }
  73
  74         return sd_bus_message_close_container(reply);
  75 }
  76
  77 static int property_get_idle_hint(
  78                 sd_bus *bus,
  79                 const char *path,
  80                 const char *interface,
  81                 const char *property,
  82                 sd_bus_message *reply,
  83                 void *userdata,
  84                 sd_bus_error *error) {
  85
  86         User *u = userdata;
  87
  88         assert(bus);
  89         assert(reply);
  90         assert(u);
  91
  92         return sd_bus_message_append(reply, "b", user_get_idle_hint(u, NULL) > 0);
  93 }
  94
  95 static int property_get_idle_since_hint(
  96                 sd_bus *bus,
  97                 const char *path,
  98                 const char *interface,
  99                 const char *property,
 100                 sd_bus_message *reply,
 101                 void *userdata,
 102                 sd_bus_error *error) {
 103
 104         User *u = userdata;
 105         dual_timestamp t = DUAL_TIMESTAMP_NULL;
 106         uint64_t k;
 107
 108         assert(bus);
 109         assert(reply);
 110         assert(u);
 111
 112         user_get_idle_hint(u, &t);
 113         k = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 114
 115         return sd_bus_message_append(reply, "t", k);
 116 }
 117
 118 static int property_get_linger(
 119                 sd_bus *bus,
 120                 const char *path,
 121                 const char *interface,
 122                 const char *property,
 123                 sd_bus_message *reply,
 124                 void *userdata,
 125                 sd_bus_error *error) {
 126
 127         User *u = userdata;
 128         int r;
 129
 130         assert(bus);
 131         assert(reply);
 132         assert(u);
 133
 134         r = user_check_linger_file(u);
 135
 136         return sd_bus_message_append(reply, "b", r > 0);
 137 }
 138
 139 int bus_user_method_terminate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 140         User *u = userdata;
 141         int r;
 142
 143         assert(message);
 144         assert(u);
 145
 146         r = bus_verify_polkit_async(
 147                         message,
 148                         CAP_KILL,
 149                         "org.freedesktop.login1.manage",
 150                         NULL,
 151                         false,
 152                         u->uid,
 153                         &u->manager->polkit_registry,
 154                         error);
 155         if (r < 0)
 156                 return r;
 157         if (r == 0)
 158                 return 1; /* Will call us back */
 159
 160         r = user_stop(u, true);
 161         if (r < 0)
 162                 return r;
 163
 164         return sd_bus_reply_method_return(message, NULL);
 165 }
 166
 167 int bus_user_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 168         User *u = userdata;
 169         int32_t signo;
 170         int r;
 171
 172         assert(message);
 173         assert(u);
 174
 175         r = bus_verify_polkit_async(
 176                         message,
 177                         CAP_KILL,
 178                         "org.freedesktop.login1.manage",
 179                         NULL,
 180                         false,
 181                         u->uid,
 182                         &u->manager->polkit_registry,
 183                         error);
 184         if (r < 0)
 185                 return r;
 186         if (r == 0)
 187                 return 1; /* Will call us back */
 188
 189         r = sd_bus_message_read(message, "i", &signo);
 190         if (r < 0)
 191                 return r;
 192
 193         if (!SIGNAL_VALID(signo))
 194                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);
 195
 196         r = user_kill(u, signo);
 197         if (r < 0)
 198                 return r;
 199
 200         return sd_bus_reply_method_return(message, NULL);
 201 }
 202
 203 const sd_bus_vtable user_vtable[] = {
 204         SD_BUS_VTABLE_START(0),
 205
 206         SD_BUS_PROPERTY("UID", "u", bus_property_get_uid, offsetof(User, uid), SD_BUS_VTABLE_PROPERTY_CONST),
 207         SD_BUS_PROPERTY("GID", "u", bus_property_get_gid, offsetof(User, gid), SD_BUS_VTABLE_PROPERTY_CONST),
 208         SD_BUS_PROPERTY("Name", "s", NULL, offsetof(User, name), SD_BUS_VTABLE_PROPERTY_CONST),
 209         BUS_PROPERTY_DUAL_TIMESTAMP("Timestamp", offsetof(User, timestamp), SD_BUS_VTABLE_PROPERTY_CONST),
 210         SD_BUS_PROPERTY("RuntimePath", "s", NULL, offsetof(User, runtime_path), SD_BUS_VTABLE_PROPERTY_CONST),
 211         SD_BUS_PROPERTY("Service", "s", NULL, offsetof(User, service), SD_BUS_VTABLE_PROPERTY_CONST),
 212         SD_BUS_PROPERTY("Slice", "s", NULL, offsetof(User, slice), SD_BUS_VTABLE_PROPERTY_CONST),
 213         SD_BUS_PROPERTY("Display", "(so)", property_get_display, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 214         SD_BUS_PROPERTY("State", "s", property_get_state, 0, 0),
 215         SD_BUS_PROPERTY("Sessions", "a(so)", property_get_sessions, 0, 0),
 216         SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 217         SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 218         SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 219         SD_BUS_PROPERTY("Linger", "b", property_get_linger, 0, 0),
 220
 221         SD_BUS_METHOD("Terminate", NULL, NULL, bus_user_method_terminate, SD_BUS_VTABLE_UNPRIVILEGED),
 222         SD_BUS_METHOD("Kill", "i", NULL, bus_user_method_kill, SD_BUS_VTABLE_UNPRIVILEGED),
 223
 224         SD_BUS_VTABLE_END
 225 };
 226
 227 int user_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
 228         Manager *m = userdata;
 229         uid_t uid;
 230         User *user;
 231         int r;
 232
 233         assert(bus);
 234         assert(path);
 235         assert(interface);
 236         assert(found);
 237         assert(m);
 238
 239         if (streq(path, "/org/freedesktop/login1/user/self")) {
 240                 sd_bus_message *message;
 241
 242                 message = sd_bus_get_current_message(bus);
 243                 if (!message)
 244                         return 0;
 245
 246                 r = manager_get_user_from_creds(m, message, UID_INVALID, error, &user);
 247                 if (r < 0)
 248                         return r;
 249         } else {
 250                 const char *p;
 251
 252                 p = startswith(path, "/org/freedesktop/login1/user/_");
 253                 if (!p)
 254                         return 0;
 255
 256                 r = parse_uid(p, &uid);
 257                 if (r < 0)
 258                         return 0;
 259
 260                 user = hashmap_get(m->users, UID_TO_PTR(uid));
 261                 if (!user)
 262                         return 0;
 263         }
 264
 265         *found = user;
 266         return 1;
 267 }
 268
 269 char *user_bus_path(User *u) {
 270         char *s;
 271
 272         assert(u);
 273
 274         if (asprintf(&s, "/org/freedesktop/login1/user/_"UID_FMT, u->uid) < 0)
 275                 return NULL;
 276
 277         return s;
 278 }
 279
 280 int user_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
 281         _cleanup_strv_free_ char **l = NULL;
 282         sd_bus_message *message;
 283         Manager *m = userdata;
 284         User *user;
 285         Iterator i;
 286         int r;
 287
 288         assert(bus);
 289         assert(path);
 290         assert(nodes);
 291
 292         HASHMAP_FOREACH(user, m->users, i) {
 293                 char *p;
 294
 295                 p = user_bus_path(user);
 296                 if (!p)
 297                         return -ENOMEM;
 298
 299                 r = strv_consume(&l, p);
 300                 if (r < 0)
 301                         return r;
 302         }
 303
 304         message = sd_bus_get_current_message(bus);
 305         if (message) {
 306                 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 307                 uid_t uid;
 308
 309                 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_OWNER_UID|SD_BUS_CREDS_AUGMENT, &creds);
 310                 if (r >= 0) {
 311                         r = sd_bus_creds_get_owner_uid(creds, &uid);
 312                         if (r >= 0) {
 313                                 user = hashmap_get(m->users, UID_TO_PTR(uid));
 314                                 if (user) {
 315                                         r = strv_extend(&l, "/org/freedesktop/login1/user/self");
 316                                         if (r < 0)
 317                                                 return r;
 318                                 }
 319                         }
 320                 }
 321         }
 322
 323         *nodes = TAKE_PTR(l);
 324
 325         return 1;
 326 }
 327
 328 int user_send_signal(User *u, bool new_user) {
 329         _cleanup_free_ char *p = NULL;
 330
 331         assert(u);
 332
 333         p = user_bus_path(u);
 334         if (!p)
 335                 return -ENOMEM;
 336
 337         return sd_bus_emit_signal(
 338                         u->manager->bus,
 339                         "/org/freedesktop/login1",
 340                         "org.freedesktop.login1.Manager",
 341                         new_user ? "UserNew" : "UserRemoved",
 342                         "uo", (uint32_t) u->uid, p);
 343 }
 344
 345 int user_send_changed(User *u, const char *properties, ...) {
 346         _cleanup_free_ char *p = NULL;
 347         char **l;
 348
 349         assert(u);
 350
 351         if (!u->started)
 352                 return 0;
 353
 354         p = user_bus_path(u);
 355         if (!p)
 356                 return -ENOMEM;
 357
 358         l = strv_from_stdarg_alloca(properties);
 359
 360         return sd_bus_emit_properties_changed_strv(u->manager->bus, p, "org.freedesktop.login1.User", l);
 361 }