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 "missing_capability.h"
  12 #include "signal-util.h"
  13 #include "strv.h"
  14 #include "user-util.h"
  15
  16 static BUS_DEFINE_PROPERTY_GET2(property_get_state, "s", User, user_get_state, user_state_to_string);
  17
  18 static int property_get_display(
  19                 sd_bus *bus,
  20                 const char *path,
  21                 const char *interface,
  22                 const char *property,
  23                 sd_bus_message *reply,
  24                 void *userdata,
  25                 sd_bus_error *error) {
  26
  27         _cleanup_free_ char *p = NULL;
  28         User *u = userdata;
  29
  30         assert(bus);
  31         assert(reply);
  32         assert(u);
  33
  34         p = u->display ? session_bus_path(u->display) : strdup("/");
  35         if (!p)
  36                 return -ENOMEM;
  37
  38         return sd_bus_message_append(reply, "(so)", u->display ? u->display->id : "", p);
  39 }
  40
  41 static int property_get_sessions(
  42                 sd_bus *bus,
  43                 const char *path,
  44                 const char *interface,
  45                 const char *property,
  46                 sd_bus_message *reply,
  47                 void *userdata,
  48                 sd_bus_error *error) {
  49
  50         User *u = userdata;
  51         Session *session;
  52         int r;
  53
  54         assert(bus);
  55         assert(reply);
  56         assert(u);
  57
  58         r = sd_bus_message_open_container(reply, 'a', "(so)");
  59         if (r < 0)
  60                 return r;
  61
  62         LIST_FOREACH(sessions_by_user, session, u->sessions) {
  63                 _cleanup_free_ char *p = NULL;
  64
  65                 p = session_bus_path(session);
  66                 if (!p)
  67                         return -ENOMEM;
  68
  69                 r = sd_bus_message_append(reply, "(so)", session->id, p);
  70                 if (r < 0)
  71                         return r;
  72
  73         }
  74
  75         return sd_bus_message_close_container(reply);
  76 }
  77
  78 static int property_get_idle_hint(
  79                 sd_bus *bus,
  80                 const char *path,
  81                 const char *interface,
  82                 const char *property,
  83                 sd_bus_message *reply,
  84                 void *userdata,
  85                 sd_bus_error *error) {
  86
  87         User *u = userdata;
  88
  89         assert(bus);
  90         assert(reply);
  91         assert(u);
  92
  93         return sd_bus_message_append(reply, "b", user_get_idle_hint(u, NULL) > 0);
  94 }
  95
  96 static int property_get_idle_since_hint(
  97                 sd_bus *bus,
  98                 const char *path,
  99                 const char *interface,
 100                 const char *property,
 101                 sd_bus_message *reply,
 102                 void *userdata,
 103                 sd_bus_error *error) {
 104
 105         User *u = userdata;
 106         dual_timestamp t = DUAL_TIMESTAMP_NULL;
 107         uint64_t k;
 108
 109         assert(bus);
 110         assert(reply);
 111         assert(u);
 112
 113         (void) user_get_idle_hint(u, &t);
 114         k = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 115
 116         return sd_bus_message_append(reply, "t", k);
 117 }
 118
 119 static int property_get_linger(
 120                 sd_bus *bus,
 121                 const char *path,
 122                 const char *interface,
 123                 const char *property,
 124                 sd_bus_message *reply,
 125                 void *userdata,
 126                 sd_bus_error *error) {
 127
 128         User *u = userdata;
 129         int r;
 130
 131         assert(bus);
 132         assert(reply);
 133         assert(u);
 134
 135         r = user_check_linger_file(u);
 136
 137         return sd_bus_message_append(reply, "b", r > 0);
 138 }
 139
 140 int bus_user_method_terminate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 141         User *u = userdata;
 142         int r;
 143
 144         assert(message);
 145         assert(u);
 146
 147         r = bus_verify_polkit_async(
 148                         message,
 149                         CAP_KILL,
 150                         "org.freedesktop.login1.manage",
 151                         NULL,
 152                         false,
 153                         u->uid,
 154                         &u->manager->polkit_registry,
 155                         error);
 156         if (r < 0)
 157                 return r;
 158         if (r == 0)
 159                 return 1; /* Will call us back */
 160
 161         r = user_stop(u, true);
 162         if (r < 0)
 163                 return r;
 164
 165         return sd_bus_reply_method_return(message, NULL);
 166 }
 167
 168 int bus_user_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 169         User *u = userdata;
 170         int32_t signo;
 171         int r;
 172
 173         assert(message);
 174         assert(u);
 175
 176         r = bus_verify_polkit_async(
 177                         message,
 178                         CAP_KILL,
 179                         "org.freedesktop.login1.manage",
 180                         NULL,
 181                         false,
 182                         u->uid,
 183                         &u->manager->polkit_registry,
 184                         error);
 185         if (r < 0)
 186                 return r;
 187         if (r == 0)
 188                 return 1; /* Will call us back */
 189
 190         r = sd_bus_message_read(message, "i", &signo);
 191         if (r < 0)
 192                 return r;
 193
 194         if (!SIGNAL_VALID(signo))
 195                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);
 196
 197         r = user_kill(u, signo);
 198         if (r < 0)
 199                 return r;
 200
 201         return sd_bus_reply_method_return(message, NULL);
 202 }
 203
 204 const sd_bus_vtable user_vtable[] = {
 205         SD_BUS_VTABLE_START(0),
 206
 207         SD_BUS_PROPERTY("UID", "u", bus_property_get_uid, offsetof(User, uid), SD_BUS_VTABLE_PROPERTY_CONST),
 208         SD_BUS_PROPERTY("GID", "u", bus_property_get_gid, offsetof(User, gid), SD_BUS_VTABLE_PROPERTY_CONST),
 209         SD_BUS_PROPERTY("Name", "s", NULL, offsetof(User, name), SD_BUS_VTABLE_PROPERTY_CONST),
 210         BUS_PROPERTY_DUAL_TIMESTAMP("Timestamp", offsetof(User, timestamp), SD_BUS_VTABLE_PROPERTY_CONST),
 211         SD_BUS_PROPERTY("RuntimePath", "s", NULL, offsetof(User, runtime_path), SD_BUS_VTABLE_PROPERTY_CONST),
 212         SD_BUS_PROPERTY("Service", "s", NULL, offsetof(User, service), SD_BUS_VTABLE_PROPERTY_CONST),
 213         SD_BUS_PROPERTY("Slice", "s", NULL, offsetof(User, slice), SD_BUS_VTABLE_PROPERTY_CONST),
 214         SD_BUS_PROPERTY("Display", "(so)", property_get_display, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 215         SD_BUS_PROPERTY("State", "s", property_get_state, 0, 0),
 216         SD_BUS_PROPERTY("Sessions", "a(so)", property_get_sessions, 0, 0),
 217         SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 218         SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 219         SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 220         SD_BUS_PROPERTY("Linger", "b", property_get_linger, 0, 0),
 221
 222         SD_BUS_METHOD("Terminate", NULL, NULL, bus_user_method_terminate, SD_BUS_VTABLE_UNPRIVILEGED),
 223         SD_BUS_METHOD("Kill", "i", NULL, bus_user_method_kill, SD_BUS_VTABLE_UNPRIVILEGED),
 224
 225         SD_BUS_VTABLE_END
 226 };
 227
 228 int user_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
 229         Manager *m = userdata;
 230         uid_t uid;
 231         User *user;
 232         int r;
 233
 234         assert(bus);
 235         assert(path);
 236         assert(interface);
 237         assert(found);
 238         assert(m);
 239
 240         if (streq(path, "/org/freedesktop/login1/user/self")) {
 241                 sd_bus_message *message;
 242
 243                 message = sd_bus_get_current_message(bus);
 244                 if (!message)
 245                         return 0;
 246
 247                 r = manager_get_user_from_creds(m, message, UID_INVALID, error, &user);
 248                 if (r < 0)
 249                         return r;
 250         } else {
 251                 const char *p;
 252
 253                 p = startswith(path, "/org/freedesktop/login1/user/_");
 254                 if (!p)
 255                         return 0;
 256
 257                 r = parse_uid(p, &uid);
 258                 if (r < 0)
 259                         return 0;
 260
 261                 user = hashmap_get(m->users, UID_TO_PTR(uid));
 262                 if (!user)
 263                         return 0;
 264         }
 265
 266         *found = user;
 267         return 1;
 268 }
 269
 270 char *user_bus_path(User *u) {
 271         char *s;
 272
 273         assert(u);
 274
 275         if (asprintf(&s, "/org/freedesktop/login1/user/_"UID_FMT, u->uid) < 0)
 276                 return NULL;
 277
 278         return s;
 279 }
 280
 281 int user_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
 282         _cleanup_strv_free_ char **l = NULL;
 283         sd_bus_message *message;
 284         Manager *m = userdata;
 285         User *user;
 286         Iterator i;
 287         int r;
 288
 289         assert(bus);
 290         assert(path);
 291         assert(nodes);
 292
 293         HASHMAP_FOREACH(user, m->users, i) {
 294                 char *p;
 295
 296                 p = user_bus_path(user);
 297                 if (!p)
 298                         return -ENOMEM;
 299
 300                 r = strv_consume(&l, p);
 301                 if (r < 0)
 302                         return r;
 303         }
 304
 305         message = sd_bus_get_current_message(bus);
 306         if (message) {
 307                 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 308                 uid_t uid;
 309
 310                 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_OWNER_UID|SD_BUS_CREDS_AUGMENT, &creds);
 311                 if (r >= 0) {
 312                         r = sd_bus_creds_get_owner_uid(creds, &uid);
 313                         if (r >= 0) {
 314                                 user = hashmap_get(m->users, UID_TO_PTR(uid));
 315                                 if (user) {
 316                                         r = strv_extend(&l, "/org/freedesktop/login1/user/self");
 317                                         if (r < 0)
 318                                                 return r;
 319                                 }
 320                         }
 321                 }
 322         }
 323
 324         *nodes = TAKE_PTR(l);
 325
 326         return 1;
 327 }
 328
 329 int user_send_signal(User *u, bool new_user) {
 330         _cleanup_free_ char *p = NULL;
 331
 332         assert(u);
 333
 334         p = user_bus_path(u);
 335         if (!p)
 336                 return -ENOMEM;
 337
 338         return sd_bus_emit_signal(
 339                         u->manager->bus,
 340                         "/org/freedesktop/login1",
 341                         "org.freedesktop.login1.Manager",
 342                         new_user ? "UserNew" : "UserRemoved",
 343                         "uo", (uint32_t) u->uid, p);
 344 }
 345
 346 int user_send_changed(User *u, const char *properties, ...) {
 347         _cleanup_free_ char *p = NULL;
 348         char **l;
 349
 350         assert(u);
 351
 352         if (!u->started)
 353                 return 0;
 354
 355         p = user_bus_path(u);
 356         if (!p)
 357                 return -ENOMEM;
 358
 359         l = strv_from_stdarg_alloca(properties);
 360
 361         return sd_bus_emit_properties_changed_strv(u->manager->bus, p, "org.freedesktop.login1.User", l);
 362 }