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-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 BUS_DEFINE_PROPERTY_GET2(property_get_state, "s", User, user_get_state, user_state_to_string);
  20
  21 static int property_get_display(
  22                 sd_bus *bus,
  23                 const char *path,
  24                 const char *interface,
  25                 const char *property,
  26                 sd_bus_message *reply,
  27                 void *userdata,
  28                 sd_bus_error *error) {
  29
  30         _cleanup_free_ char *p = NULL;
  31         User *u = userdata;
  32
  33         assert(bus);
  34         assert(reply);
  35         assert(u);
  36
  37         p = u->display ? session_bus_path(u->display) : strdup("/");
  38         if (!p)
  39                 return -ENOMEM;
  40
  41         return sd_bus_message_append(reply, "(so)", u->display ? u->display->id : "", p);
  42 }
  43
  44 static int property_get_sessions(
  45                 sd_bus *bus,
  46                 const char *path,
  47                 const char *interface,
  48                 const char *property,
  49                 sd_bus_message *reply,
  50                 void *userdata,
  51                 sd_bus_error *error) {
  52
  53         User *u = userdata;
  54         Session *session;
  55         int r;
  56
  57         assert(bus);
  58         assert(reply);
  59         assert(u);
  60
  61         r = sd_bus_message_open_container(reply, 'a', "(so)");
  62         if (r < 0)
  63                 return r;
  64
  65         LIST_FOREACH(sessions_by_user, session, u->sessions) {
  66                 _cleanup_free_ char *p = NULL;
  67
  68                 p = session_bus_path(session);
  69                 if (!p)
  70                         return -ENOMEM;
  71
  72                 r = sd_bus_message_append(reply, "(so)", session->id, p);
  73                 if (r < 0)
  74                         return r;
  75
  76         }
  77
  78         return sd_bus_message_close_container(reply);
  79 }
  80
  81 static int property_get_idle_hint(
  82                 sd_bus *bus,
  83                 const char *path,
  84                 const char *interface,
  85                 const char *property,
  86                 sd_bus_message *reply,
  87                 void *userdata,
  88                 sd_bus_error *error) {
  89
  90         User *u = userdata;
  91
  92         assert(bus);
  93         assert(reply);
  94         assert(u);
  95
  96         return sd_bus_message_append(reply, "b", user_get_idle_hint(u, NULL) > 0);
  97 }
  98
  99 static int property_get_idle_since_hint(
 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         dual_timestamp t = DUAL_TIMESTAMP_NULL;
 110         uint64_t k;
 111
 112         assert(bus);
 113         assert(reply);
 114         assert(u);
 115
 116         (void) user_get_idle_hint(u, &t);
 117         k = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 118
 119         return sd_bus_message_append(reply, "t", k);
 120 }
 121
 122 static int property_get_linger(
 123                 sd_bus *bus,
 124                 const char *path,
 125                 const char *interface,
 126                 const char *property,
 127                 sd_bus_message *reply,
 128                 void *userdata,
 129                 sd_bus_error *error) {
 130
 131         User *u = userdata;
 132         int r;
 133
 134         assert(bus);
 135         assert(reply);
 136         assert(u);
 137
 138         r = user_check_linger_file(u);
 139
 140         return sd_bus_message_append(reply, "b", r > 0);
 141 }
 142
 143 int bus_user_method_terminate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 144         User *u = userdata;
 145         int r;
 146
 147         assert(message);
 148         assert(u);
 149
 150         r = bus_verify_polkit_async(
 151                         message,
 152                         CAP_KILL,
 153                         "org.freedesktop.login1.manage",
 154                         NULL,
 155                         false,
 156                         u->uid,
 157                         &u->manager->polkit_registry,
 158                         error);
 159         if (r < 0)
 160                 return r;
 161         if (r == 0)
 162                 return 1; /* Will call us back */
 163
 164         r = user_stop(u, true);
 165         if (r < 0)
 166                 return r;
 167
 168         return sd_bus_reply_method_return(message, NULL);
 169 }
 170
 171 int bus_user_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 172         User *u = userdata;
 173         int32_t signo;
 174         int r;
 175
 176         assert(message);
 177         assert(u);
 178
 179         r = bus_verify_polkit_async(
 180                         message,
 181                         CAP_KILL,
 182                         "org.freedesktop.login1.manage",
 183                         NULL,
 184                         false,
 185                         u->uid,
 186                         &u->manager->polkit_registry,
 187                         error);
 188         if (r < 0)
 189                 return r;
 190         if (r == 0)
 191                 return 1; /* Will call us back */
 192
 193         r = sd_bus_message_read(message, "i", &signo);
 194         if (r < 0)
 195                 return r;
 196
 197         if (!SIGNAL_VALID(signo))
 198                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);
 199
 200         r = user_kill(u, signo);
 201         if (r < 0)
 202                 return r;
 203
 204         return sd_bus_reply_method_return(message, NULL);
 205 }
 206
 207 const sd_bus_vtable user_vtable[] = {
 208         SD_BUS_VTABLE_START(0),
 209
 210         SD_BUS_PROPERTY("UID", "u", bus_property_get_uid, offsetof(User, uid), SD_BUS_VTABLE_PROPERTY_CONST),
 211         SD_BUS_PROPERTY("GID", "u", bus_property_get_gid, offsetof(User, gid), SD_BUS_VTABLE_PROPERTY_CONST),
 212         SD_BUS_PROPERTY("Name", "s", NULL, offsetof(User, name), SD_BUS_VTABLE_PROPERTY_CONST),
 213         BUS_PROPERTY_DUAL_TIMESTAMP("Timestamp", offsetof(User, timestamp), SD_BUS_VTABLE_PROPERTY_CONST),
 214         SD_BUS_PROPERTY("RuntimePath", "s", NULL, offsetof(User, runtime_path), SD_BUS_VTABLE_PROPERTY_CONST),
 215         SD_BUS_PROPERTY("Service", "s", NULL, offsetof(User, service), SD_BUS_VTABLE_PROPERTY_CONST),
 216         SD_BUS_PROPERTY("Slice", "s", NULL, offsetof(User, slice), SD_BUS_VTABLE_PROPERTY_CONST),
 217         SD_BUS_PROPERTY("Display", "(so)", property_get_display, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 218         SD_BUS_PROPERTY("State", "s", property_get_state, 0, 0),
 219         SD_BUS_PROPERTY("Sessions", "a(so)", property_get_sessions, 0, 0),
 220         SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 221         SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 222         SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 223         SD_BUS_PROPERTY("Linger", "b", property_get_linger, 0, 0),
 224
 225         SD_BUS_METHOD("Terminate", NULL, NULL, bus_user_method_terminate, SD_BUS_VTABLE_UNPRIVILEGED),
 226         SD_BUS_METHOD("Kill", "i", NULL, bus_user_method_kill, SD_BUS_VTABLE_UNPRIVILEGED),
 227
 228         SD_BUS_VTABLE_END
 229 };
 230
 231 int user_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
 232         Manager *m = userdata;
 233         uid_t uid;
 234         User *user;
 235         int r;
 236
 237         assert(bus);
 238         assert(path);
 239         assert(interface);
 240         assert(found);
 241         assert(m);
 242
 243         if (streq(path, "/org/freedesktop/login1/user/self")) {
 244                 sd_bus_message *message;
 245
 246                 message = sd_bus_get_current_message(bus);
 247                 if (!message)
 248                         return 0;
 249
 250                 r = manager_get_user_from_creds(m, message, UID_INVALID, error, &user);
 251                 if (r == -ENXIO) {
 252                         sd_bus_error_free(error);
 253                         return 0;
 254                 }
 255                 if (r < 0)
 256                         return r;
 257         } else {
 258                 const char *p;
 259
 260                 p = startswith(path, "/org/freedesktop/login1/user/_");
 261                 if (!p)
 262                         return 0;
 263
 264                 r = parse_uid(p, &uid);
 265                 if (r < 0)
 266                         return 0;
 267
 268                 user = hashmap_get(m->users, UID_TO_PTR(uid));
 269                 if (!user)
 270                         return 0;
 271         }
 272
 273         *found = user;
 274         return 1;
 275 }
 276
 277 char *user_bus_path(User *u) {
 278         char *s;
 279
 280         assert(u);
 281
 282         if (asprintf(&s, "/org/freedesktop/login1/user/_"UID_FMT, u->uid) < 0)
 283                 return NULL;
 284
 285         return s;
 286 }
 287
 288 int user_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
 289         _cleanup_strv_free_ char **l = NULL;
 290         sd_bus_message *message;
 291         Manager *m = userdata;
 292         User *user;
 293         Iterator i;
 294         int r;
 295
 296         assert(bus);
 297         assert(path);
 298         assert(nodes);
 299
 300         HASHMAP_FOREACH(user, m->users, i) {
 301                 char *p;
 302
 303                 p = user_bus_path(user);
 304                 if (!p)
 305                         return -ENOMEM;
 306
 307                 r = strv_consume(&l, p);
 308                 if (r < 0)
 309                         return r;
 310         }
 311
 312         message = sd_bus_get_current_message(bus);
 313         if (message) {
 314                 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 315
 316                 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_OWNER_UID|SD_BUS_CREDS_AUGMENT, &creds);
 317                 if (r >= 0) {
 318                         uid_t uid;
 319
 320                         r = sd_bus_creds_get_owner_uid(creds, &uid);
 321                         if (r >= 0) {
 322                                 user = hashmap_get(m->users, UID_TO_PTR(uid));
 323                                 if (user) {
 324                                         r = strv_extend(&l, "/org/freedesktop/login1/user/self");
 325                                         if (r < 0)
 326                                                 return r;
 327                                 }
 328                         }
 329                 }
 330         }
 331
 332         *nodes = TAKE_PTR(l);
 333
 334         return 1;
 335 }
 336
 337 int user_send_signal(User *u, bool new_user) {
 338         _cleanup_free_ char *p = NULL;
 339
 340         assert(u);
 341
 342         p = user_bus_path(u);
 343         if (!p)
 344                 return -ENOMEM;
 345
 346         return sd_bus_emit_signal(
 347                         u->manager->bus,
 348                         "/org/freedesktop/login1",
 349                         "org.freedesktop.login1.Manager",
 350                         new_user ? "UserNew" : "UserRemoved",
 351                         "uo", (uint32_t) u->uid, p);
 352 }
 353
 354 int user_send_changed(User *u, const char *properties, ...) {
 355         _cleanup_free_ char *p = NULL;
 356         char **l;
 357
 358         assert(u);
 359
 360         if (!u->started)
 361                 return 0;
 362
 363         p = user_bus_path(u);
 364         if (!p)
 365                 return -ENOMEM;
 366
 367         l = strv_from_stdarg_alloca(properties);
 368
 369         return sd_bus_emit_properties_changed_strv(u->manager->bus, p, "org.freedesktop.login1.User", l);
 370 }