src/login/logind-user-dbus.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2011 Lennart Poettering
   6 ***/
   7
   8 #include <errno.h>
   9 #include <string.h>
  10
  11 #include "alloc-util.h"
  12 #include "bus-util.h"
  13 #include "format-util.h"
  14 #include "logind-user.h"
  15 #include "logind.h"
  16 #include "signal-util.h"
  17 #include "strv.h"
  18 #include "user-util.h"
  19
  20 static BUS_DEFINE_PROPERTY_GET2(property_get_state, "s", User, user_get_state, user_state_to_string);
  21
  22 static int property_get_display(
  23                 sd_bus *bus,
  24                 const char *path,
  25                 const char *interface,
  26                 const char *property,
  27                 sd_bus_message *reply,
  28                 void *userdata,
  29                 sd_bus_error *error) {
  30
  31         _cleanup_free_ char *p = NULL;
  32         User *u = userdata;
  33
  34         assert(bus);
  35         assert(reply);
  36         assert(u);
  37
  38         p = u->display ? session_bus_path(u->display) : strdup("/");
  39         if (!p)
  40                 return -ENOMEM;
  41
  42         return sd_bus_message_append(reply, "(so)", u->display ? u->display->id : "", p);
  43 }
  44
  45 static int property_get_sessions(
  46                 sd_bus *bus,
  47                 const char *path,
  48                 const char *interface,
  49                 const char *property,
  50                 sd_bus_message *reply,
  51                 void *userdata,
  52                 sd_bus_error *error) {
  53
  54         User *u = userdata;
  55         Session *session;
  56         int r;
  57
  58         assert(bus);
  59         assert(reply);
  60         assert(u);
  61
  62         r = sd_bus_message_open_container(reply, 'a', "(so)");
  63         if (r < 0)
  64                 return r;
  65
  66         LIST_FOREACH(sessions_by_user, session, u->sessions) {
  67                 _cleanup_free_ char *p = NULL;
  68
  69                 p = session_bus_path(session);
  70                 if (!p)
  71                         return -ENOMEM;
  72
  73                 r = sd_bus_message_append(reply, "(so)", session->id, p);
  74                 if (r < 0)
  75                         return r;
  76
  77         }
  78
  79         return sd_bus_message_close_container(reply);
  80 }
  81
  82 static int property_get_idle_hint(
  83                 sd_bus *bus,
  84                 const char *path,
  85                 const char *interface,
  86                 const char *property,
  87                 sd_bus_message *reply,
  88                 void *userdata,
  89                 sd_bus_error *error) {
  90
  91         User *u = userdata;
  92
  93         assert(bus);
  94         assert(reply);
  95         assert(u);
  96
  97         return sd_bus_message_append(reply, "b", user_get_idle_hint(u, NULL) > 0);
  98 }
  99
 100 static int property_get_idle_since_hint(
 101                 sd_bus *bus,
 102                 const char *path,
 103                 const char *interface,
 104                 const char *property,
 105                 sd_bus_message *reply,
 106                 void *userdata,
 107                 sd_bus_error *error) {
 108
 109         User *u = userdata;
 110         dual_timestamp t = DUAL_TIMESTAMP_NULL;
 111         uint64_t k;
 112
 113         assert(bus);
 114         assert(reply);
 115         assert(u);
 116
 117         user_get_idle_hint(u, &t);
 118         k = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 119
 120         return sd_bus_message_append(reply, "t", k);
 121 }
 122
 123 static int property_get_linger(
 124                 sd_bus *bus,
 125                 const char *path,
 126                 const char *interface,
 127                 const char *property,
 128                 sd_bus_message *reply,
 129                 void *userdata,
 130                 sd_bus_error *error) {
 131
 132         User *u = userdata;
 133         int r;
 134
 135         assert(bus);
 136         assert(reply);
 137         assert(u);
 138
 139         r = user_check_linger_file(u);
 140
 141         return sd_bus_message_append(reply, "b", r > 0);
 142 }
 143
 144 int bus_user_method_terminate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 145         User *u = userdata;
 146         int r;
 147
 148         assert(message);
 149         assert(u);
 150
 151         r = bus_verify_polkit_async(
 152                         message,
 153                         CAP_KILL,
 154                         "org.freedesktop.login1.manage",
 155                         NULL,
 156                         false,
 157                         u->uid,
 158                         &u->manager->polkit_registry,
 159                         error);
 160         if (r < 0)
 161                 return r;
 162         if (r == 0)
 163                 return 1; /* Will call us back */
 164
 165         r = user_stop(u, true);
 166         if (r < 0)
 167                 return r;
 168
 169         return sd_bus_reply_method_return(message, NULL);
 170 }
 171
 172 int bus_user_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 173         User *u = userdata;
 174         int32_t signo;
 175         int r;
 176
 177         assert(message);
 178         assert(u);
 179
 180         r = bus_verify_polkit_async(
 181                         message,
 182                         CAP_KILL,
 183                         "org.freedesktop.login1.manage",
 184                         NULL,
 185                         false,
 186                         u->uid,
 187                         &u->manager->polkit_registry,
 188                         error);
 189         if (r < 0)
 190                 return r;
 191         if (r == 0)
 192                 return 1; /* Will call us back */
 193
 194         r = sd_bus_message_read(message, "i", &signo);
 195         if (r < 0)
 196                 return r;
 197
 198         if (!SIGNAL_VALID(signo))
 199                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);
 200
 201         r = user_kill(u, signo);
 202         if (r < 0)
 203                 return r;
 204
 205         return sd_bus_reply_method_return(message, NULL);
 206 }
 207
 208 const sd_bus_vtable user_vtable[] = {
 209         SD_BUS_VTABLE_START(0),
 210
 211         SD_BUS_PROPERTY("UID", "u", bus_property_get_uid, offsetof(User, uid), SD_BUS_VTABLE_PROPERTY_CONST),
 212         SD_BUS_PROPERTY("GID", "u", bus_property_get_gid, offsetof(User, gid), SD_BUS_VTABLE_PROPERTY_CONST),
 213         SD_BUS_PROPERTY("Name", "s", NULL, offsetof(User, name), SD_BUS_VTABLE_PROPERTY_CONST),
 214         BUS_PROPERTY_DUAL_TIMESTAMP("Timestamp", offsetof(User, timestamp), SD_BUS_VTABLE_PROPERTY_CONST),
 215         SD_BUS_PROPERTY("RuntimePath", "s", NULL, offsetof(User, runtime_path), SD_BUS_VTABLE_PROPERTY_CONST),
 216         SD_BUS_PROPERTY("Service", "s", NULL, offsetof(User, service), SD_BUS_VTABLE_PROPERTY_CONST),
 217         SD_BUS_PROPERTY("Slice", "s", NULL, offsetof(User, slice), SD_BUS_VTABLE_PROPERTY_CONST),
 218         SD_BUS_PROPERTY("Display", "(so)", property_get_display, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 219         SD_BUS_PROPERTY("State", "s", property_get_state, 0, 0),
 220         SD_BUS_PROPERTY("Sessions", "a(so)", property_get_sessions, 0, 0),
 221         SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 222         SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 223         SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 224         SD_BUS_PROPERTY("Linger", "b", property_get_linger, 0, 0),
 225
 226         SD_BUS_METHOD("Terminate", NULL, NULL, bus_user_method_terminate, SD_BUS_VTABLE_UNPRIVILEGED),
 227         SD_BUS_METHOD("Kill", "i", NULL, bus_user_method_kill, SD_BUS_VTABLE_UNPRIVILEGED),
 228
 229         SD_BUS_VTABLE_END
 230 };
 231
 232 int user_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
 233         Manager *m = userdata;
 234         uid_t uid;
 235         User *user;
 236         int r;
 237
 238         assert(bus);
 239         assert(path);
 240         assert(interface);
 241         assert(found);
 242         assert(m);
 243
 244         if (streq(path, "/org/freedesktop/login1/user/self")) {
 245                 sd_bus_message *message;
 246
 247                 message = sd_bus_get_current_message(bus);
 248                 if (!message)
 249                         return 0;
 250
 251                 r = manager_get_user_from_creds(m, message, UID_INVALID, error, &user);
 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                 uid_t uid;
 313
 314                 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_OWNER_UID|SD_BUS_CREDS_AUGMENT, &creds);
 315                 if (r >= 0) {
 316                         r = sd_bus_creds_get_owner_uid(creds, &uid);
 317                         if (r >= 0) {
 318                                 user = hashmap_get(m->users, UID_TO_PTR(uid));
 319                                 if (user) {
 320                                         r = strv_extend(&l, "/org/freedesktop/login1/user/self");
 321                                         if (r < 0)
 322                                                 return r;
 323                                 }
 324                         }
 325                 }
 326         }
 327
 328         *nodes = TAKE_PTR(l);
 329
 330         return 1;
 331 }
 332
 333 int user_send_signal(User *u, bool new_user) {
 334         _cleanup_free_ char *p = NULL;
 335
 336         assert(u);
 337
 338         p = user_bus_path(u);
 339         if (!p)
 340                 return -ENOMEM;
 341
 342         return sd_bus_emit_signal(
 343                         u->manager->bus,
 344                         "/org/freedesktop/login1",
 345                         "org.freedesktop.login1.Manager",
 346                         new_user ? "UserNew" : "UserRemoved",
 347                         "uo", (uint32_t) u->uid, p);
 348 }
 349
 350 int user_send_changed(User *u, const char *properties, ...) {
 351         _cleanup_free_ char *p = NULL;
 352         char **l;
 353
 354         assert(u);
 355
 356         if (!u->started)
 357                 return 0;
 358
 359         p = user_bus_path(u);
 360         if (!p)
 361                 return -ENOMEM;
 362
 363         l = strv_from_stdarg_alloca(properties);
 364
 365         return sd_bus_emit_properties_changed_strv(u->manager->bus, p, "org.freedesktop.login1.User", l);
 366 }