1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2013 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #ifdef HAVE_VALGRIND_MEMCHECK_H
23 #include <valgrind/memcheck.h>
31 #include "bus-internal.h"
32 #include "bus-message.h"
33 #include "bus-control.h"
34 #include "bus-bloom.h"
36 #include "capability.h"
38 _public_ int sd_bus_get_unique_name(sd_bus *bus, const char **unique) {
41 assert_return(bus, -EINVAL);
42 assert_return(unique, -EINVAL);
43 assert_return(!bus_pid_changed(bus), -ECHILD);
48 r = bus_ensure_running(bus);
52 *unique = bus->unique_name;
56 static int bus_request_name_kernel(sd_bus *bus, const char *name, uint64_t flags) {
65 size = offsetof(struct kdbus_cmd, items) + KDBUS_ITEM_SIZE(l);
66 n = alloca0_align(size, 8);
68 n->flags = request_name_flags_to_kdbus(flags);
70 n->items[0].size = KDBUS_ITEM_HEADER_SIZE + l;
71 n->items[0].type = KDBUS_ITEM_NAME;
72 memcpy(n->items[0].str, name, l);
74 #ifdef HAVE_VALGRIND_MEMCHECK_H
75 VALGRIND_MAKE_MEM_DEFINED(n, n->size);
78 r = ioctl(bus->input_fd, KDBUS_CMD_NAME_ACQUIRE, n);
82 if (n->return_flags & KDBUS_NAME_IN_QUEUE)
88 static int bus_request_name_dbus1(sd_bus *bus, const char *name, uint64_t flags) {
89 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
90 uint32_t ret, param = 0;
96 if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
97 param |= BUS_NAME_ALLOW_REPLACEMENT;
98 if (flags & SD_BUS_NAME_REPLACE_EXISTING)
99 param |= BUS_NAME_REPLACE_EXISTING;
100 if (!(flags & SD_BUS_NAME_QUEUE))
101 param |= BUS_NAME_DO_NOT_QUEUE;
103 r = sd_bus_call_method(
105 "org.freedesktop.DBus",
106 "/org/freedesktop/DBus",
107 "org.freedesktop.DBus",
117 r = sd_bus_message_read(reply, "u", &ret);
121 if (ret == BUS_NAME_ALREADY_OWNER)
123 else if (ret == BUS_NAME_EXISTS)
125 else if (ret == BUS_NAME_IN_QUEUE)
127 else if (ret == BUS_NAME_PRIMARY_OWNER)
133 _public_ int sd_bus_request_name(sd_bus *bus, const char *name, uint64_t flags) {
134 assert_return(bus, -EINVAL);
135 assert_return(name, -EINVAL);
136 assert_return(!bus_pid_changed(bus), -ECHILD);
137 assert_return(!(flags & ~(SD_BUS_NAME_ALLOW_REPLACEMENT|SD_BUS_NAME_REPLACE_EXISTING|SD_BUS_NAME_QUEUE)), -EINVAL);
138 assert_return(service_name_is_valid(name), -EINVAL);
139 assert_return(name[0] != ':', -EINVAL);
141 if (!bus->bus_client)
144 /* Don't allow requesting the special driver and local names */
145 if (STR_IN_SET(name, "org.freedesktop.DBus", "org.freedesktop.DBus.Local"))
148 if (!BUS_IS_OPEN(bus->state))
152 return bus_request_name_kernel(bus, name, flags);
154 return bus_request_name_dbus1(bus, name, flags);
157 static int bus_release_name_kernel(sd_bus *bus, const char *name) {
165 l = strlen(name) + 1;
166 size = offsetof(struct kdbus_cmd, items) + KDBUS_ITEM_SIZE(l);
167 n = alloca0_align(size, 8);
170 n->items[0].size = KDBUS_ITEM_HEADER_SIZE + l;
171 n->items[0].type = KDBUS_ITEM_NAME;
172 memcpy(n->items[0].str, name, l);
174 #ifdef HAVE_VALGRIND_MEMCHECK_H
175 VALGRIND_MAKE_MEM_DEFINED(n, n->size);
177 r = ioctl(bus->input_fd, KDBUS_CMD_NAME_RELEASE, n);
184 static int bus_release_name_dbus1(sd_bus *bus, const char *name) {
185 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
192 r = sd_bus_call_method(
194 "org.freedesktop.DBus",
195 "/org/freedesktop/DBus",
196 "org.freedesktop.DBus",
205 r = sd_bus_message_read(reply, "u", &ret);
208 if (ret == BUS_NAME_NON_EXISTENT)
210 if (ret == BUS_NAME_NOT_OWNER)
212 if (ret == BUS_NAME_RELEASED)
218 _public_ int sd_bus_release_name(sd_bus *bus, const char *name) {
219 assert_return(bus, -EINVAL);
220 assert_return(name, -EINVAL);
221 assert_return(!bus_pid_changed(bus), -ECHILD);
222 assert_return(service_name_is_valid(name), -EINVAL);
223 assert_return(name[0] != ':', -EINVAL);
225 if (!bus->bus_client)
228 /* Don't allow releasing the special driver and local names */
229 if (STR_IN_SET(name, "org.freedesktop.DBus", "org.freedesktop.DBus.Local"))
232 if (!BUS_IS_OPEN(bus->state))
236 return bus_release_name_kernel(bus, name);
238 return bus_release_name_dbus1(bus, name);
241 static int kernel_get_list(sd_bus *bus, uint64_t flags, char ***x) {
242 struct kdbus_cmd_list cmd = {
246 struct kdbus_info *name_list, *name;
247 uint64_t previous_id = 0;
250 /* Caller will free half-constructed list on failure... */
252 r = ioctl(bus->input_fd, KDBUS_CMD_LIST, &cmd);
256 name_list = (struct kdbus_info *) ((uint8_t *) bus->kdbus_buffer + cmd.offset);
258 KDBUS_FOREACH(name, name_list, cmd.list_size) {
260 struct kdbus_item *item;
261 const char *entry_name = NULL;
263 if ((flags & KDBUS_LIST_UNIQUE) && name->id != previous_id) {
266 if (asprintf(&n, ":1.%llu", (unsigned long long) name->id) < 0) {
271 r = strv_consume(x, n);
275 previous_id = name->id;
278 KDBUS_ITEM_FOREACH(item, name, items)
279 if (item->type == KDBUS_ITEM_OWNED_NAME)
280 entry_name = item->name.name;
282 if (entry_name && service_name_is_valid(entry_name)) {
283 r = strv_extend(x, entry_name);
294 bus_kernel_cmd_free(bus, cmd.offset);
298 static int bus_list_names_kernel(sd_bus *bus, char ***acquired, char ***activatable) {
299 _cleanup_strv_free_ char **x = NULL, **y = NULL;
303 r = kernel_get_list(bus, KDBUS_LIST_UNIQUE | KDBUS_LIST_NAMES, &x);
309 r = kernel_get_list(bus, KDBUS_LIST_ACTIVATORS, &y);
325 static int bus_list_names_dbus1(sd_bus *bus, char ***acquired, char ***activatable) {
326 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
327 _cleanup_strv_free_ char **x = NULL, **y = NULL;
331 r = sd_bus_call_method(
333 "org.freedesktop.DBus",
334 "/org/freedesktop/DBus",
335 "org.freedesktop.DBus",
343 r = sd_bus_message_read_strv(reply, &x);
347 reply = sd_bus_message_unref(reply);
351 r = sd_bus_call_method(
353 "org.freedesktop.DBus",
354 "/org/freedesktop/DBus",
355 "org.freedesktop.DBus",
356 "ListActivatableNames",
363 r = sd_bus_message_read_strv(reply, &y);
379 _public_ int sd_bus_list_names(sd_bus *bus, char ***acquired, char ***activatable) {
380 assert_return(bus, -EINVAL);
381 assert_return(acquired || activatable, -EINVAL);
382 assert_return(!bus_pid_changed(bus), -ECHILD);
384 if (!bus->bus_client)
387 if (!BUS_IS_OPEN(bus->state))
391 return bus_list_names_kernel(bus, acquired, activatable);
393 return bus_list_names_dbus1(bus, acquired, activatable);
396 static int bus_populate_creds_from_items(
398 struct kdbus_info *info,
402 struct kdbus_item *item;
410 KDBUS_ITEM_FOREACH(item, info, items) {
412 switch (item->type) {
414 case KDBUS_ITEM_PIDS:
416 if (mask & SD_BUS_CREDS_PID && item->pids.pid > 0) {
417 c->pid = (pid_t) item->pids.pid;
418 c->mask |= SD_BUS_CREDS_PID;
421 if (mask & SD_BUS_CREDS_TID && item->pids.tid > 0) {
422 c->tid = (pid_t) item->pids.tid;
423 c->mask |= SD_BUS_CREDS_TID;
426 if (mask & SD_BUS_CREDS_PPID) {
427 if (item->pids.ppid > 0) {
428 c->ppid = (pid_t) item->pids.ppid;
429 c->mask |= SD_BUS_CREDS_PPID;
430 } else if (item->pids.pid == 1) {
431 /* The structure doesn't
432 * really distinguish the case
433 * where a process has no
434 * parent and where we don't
435 * know it because it could
436 * not be translated due to
437 * namespaces. However, we
438 * know that PID 1 has no
439 * parent process, hence let's
440 * patch that in, manually. */
442 c->mask |= SD_BUS_CREDS_PPID;
448 case KDBUS_ITEM_CREDS:
450 if (mask & SD_BUS_CREDS_UID && (uid_t) item->creds.uid != UID_INVALID) {
451 c->uid = (uid_t) item->creds.uid;
452 c->mask |= SD_BUS_CREDS_UID;
455 if (mask & SD_BUS_CREDS_EUID && (uid_t) item->creds.euid != UID_INVALID) {
456 c->euid = (uid_t) item->creds.euid;
457 c->mask |= SD_BUS_CREDS_EUID;
460 if (mask & SD_BUS_CREDS_SUID && (uid_t) item->creds.suid != UID_INVALID) {
461 c->suid = (uid_t) item->creds.suid;
462 c->mask |= SD_BUS_CREDS_SUID;
465 if (mask & SD_BUS_CREDS_FSUID && (uid_t) item->creds.fsuid != UID_INVALID) {
466 c->fsuid = (uid_t) item->creds.fsuid;
467 c->mask |= SD_BUS_CREDS_FSUID;
470 if (mask & SD_BUS_CREDS_GID && (gid_t) item->creds.gid != GID_INVALID) {
471 c->gid = (gid_t) item->creds.gid;
472 c->mask |= SD_BUS_CREDS_GID;
475 if (mask & SD_BUS_CREDS_EGID && (gid_t) item->creds.egid != GID_INVALID) {
476 c->egid = (gid_t) item->creds.egid;
477 c->mask |= SD_BUS_CREDS_EGID;
480 if (mask & SD_BUS_CREDS_SGID && (gid_t) item->creds.sgid != GID_INVALID) {
481 c->sgid = (gid_t) item->creds.sgid;
482 c->mask |= SD_BUS_CREDS_SGID;
485 if (mask & SD_BUS_CREDS_FSGID && (gid_t) item->creds.fsgid != GID_INVALID) {
486 c->fsgid = (gid_t) item->creds.fsgid;
487 c->mask |= SD_BUS_CREDS_FSGID;
492 case KDBUS_ITEM_PID_COMM:
493 if (mask & SD_BUS_CREDS_COMM) {
494 r = free_and_strdup(&c->comm, item->str);
498 c->mask |= SD_BUS_CREDS_COMM;
502 case KDBUS_ITEM_TID_COMM:
503 if (mask & SD_BUS_CREDS_TID_COMM) {
504 r = free_and_strdup(&c->tid_comm, item->str);
508 c->mask |= SD_BUS_CREDS_TID_COMM;
513 if (mask & SD_BUS_CREDS_EXE) {
514 r = free_and_strdup(&c->exe, item->str);
518 c->mask |= SD_BUS_CREDS_EXE;
522 case KDBUS_ITEM_CMDLINE:
523 if (mask & SD_BUS_CREDS_CMDLINE) {
524 c->cmdline_size = item->size - offsetof(struct kdbus_item, data);
525 c->cmdline = memdup(item->data, c->cmdline_size);
529 c->mask |= SD_BUS_CREDS_CMDLINE;
533 case KDBUS_ITEM_CGROUP:
534 m = (SD_BUS_CREDS_CGROUP | SD_BUS_CREDS_UNIT |
535 SD_BUS_CREDS_USER_UNIT | SD_BUS_CREDS_SLICE |
536 SD_BUS_CREDS_SESSION | SD_BUS_CREDS_OWNER_UID) & mask;
539 r = free_and_strdup(&c->cgroup, item->str);
543 r = bus_get_root_path(bus);
547 r = free_and_strdup(&c->cgroup_root, bus->cgroup_root);
555 case KDBUS_ITEM_CAPS:
556 m = (SD_BUS_CREDS_EFFECTIVE_CAPS | SD_BUS_CREDS_PERMITTED_CAPS |
557 SD_BUS_CREDS_INHERITABLE_CAPS | SD_BUS_CREDS_BOUNDING_CAPS) & mask;
560 if (item->caps.last_cap != cap_last_cap() ||
561 item->size - offsetof(struct kdbus_item, caps.caps) < DIV_ROUND_UP(item->caps.last_cap, 32U) * 4 * 4)
564 c->capability = memdup(item->caps.caps, item->size - offsetof(struct kdbus_item, caps.caps));
572 case KDBUS_ITEM_SECLABEL:
573 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) {
574 r = free_and_strdup(&c->label, item->str);
578 c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
582 case KDBUS_ITEM_AUDIT:
583 if (mask & SD_BUS_CREDS_AUDIT_SESSION_ID) {
584 c->audit_session_id = (uint32_t) item->audit.sessionid;
585 c->mask |= SD_BUS_CREDS_AUDIT_SESSION_ID;
588 if (mask & SD_BUS_CREDS_AUDIT_LOGIN_UID) {
589 c->audit_login_uid = (uid_t) item->audit.loginuid;
590 c->mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID;
594 case KDBUS_ITEM_OWNED_NAME:
595 if ((mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) && service_name_is_valid(item->name.name)) {
596 r = strv_extend(&c->well_known_names, item->name.name);
600 c->mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES;
604 case KDBUS_ITEM_CONN_DESCRIPTION:
605 if (mask & SD_BUS_CREDS_DESCRIPTION) {
606 r = free_and_strdup(&c->description, item->str);
610 c->mask |= SD_BUS_CREDS_DESCRIPTION;
614 case KDBUS_ITEM_AUXGROUPS:
615 if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) {
619 n = (item->size - offsetof(struct kdbus_item, data64)) / sizeof(uint64_t);
624 for (i = 0; i < n; i++)
625 g[i] = item->data64[i];
627 free(c->supplementary_gids);
628 c->supplementary_gids = g;
629 c->n_supplementary_gids = n;
631 c->mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS;
640 int bus_get_name_creds_kdbus(
644 bool allow_activator,
645 sd_bus_creds **creds) {
647 _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
648 struct kdbus_cmd_info *cmd;
649 struct kdbus_info *conn_info;
654 if (streq(name, "org.freedesktop.DBus"))
657 r = bus_kernel_parse_unique_name(name, &id);
661 size = offsetof(struct kdbus_cmd_info, items);
662 cmd = alloca0_align(size, 8);
665 l = strlen(name) + 1;
666 size = offsetof(struct kdbus_cmd_info, items) + KDBUS_ITEM_SIZE(l);
667 cmd = alloca0_align(size, 8);
668 cmd->items[0].size = KDBUS_ITEM_HEADER_SIZE + l;
669 cmd->items[0].type = KDBUS_ITEM_NAME;
670 memcpy(cmd->items[0].str, name, l);
673 /* If augmentation is on, and the bus didn't provide us
674 * the bits we want, then ask for the PID/TID so that we
675 * can read the rest from /proc. */
676 if ((mask & SD_BUS_CREDS_AUGMENT) &&
677 (mask & (SD_BUS_CREDS_PPID|
678 SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
679 SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID|
680 SD_BUS_CREDS_COMM|SD_BUS_CREDS_TID_COMM|SD_BUS_CREDS_EXE|SD_BUS_CREDS_CMDLINE|
681 SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID|
682 SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS|
683 SD_BUS_CREDS_SELINUX_CONTEXT|
684 SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)))
685 mask |= SD_BUS_CREDS_PID;
688 cmd->attach_flags = attach_flags_to_kdbus(mask);
690 r = ioctl(bus->input_fd, KDBUS_CMD_CONN_INFO, cmd);
694 conn_info = (struct kdbus_info *) ((uint8_t *) bus->kdbus_buffer + cmd->offset);
696 /* Non-activated names are considered not available */
697 if (!allow_activator && (conn_info->flags & KDBUS_HELLO_ACTIVATOR)) {
711 if (mask & SD_BUS_CREDS_UNIQUE_NAME) {
712 if (asprintf(&c->unique_name, ":1.%llu", (unsigned long long) conn_info->id) < 0) {
717 c->mask |= SD_BUS_CREDS_UNIQUE_NAME;
720 /* If KDBUS_ITEM_OWNED_NAME is requested then we'll get 0 of
721 them in case the service has no names. This does not mean
722 however that the list of owned names could not be
723 acquired. Hence, let's explicitly clarify that the data is
725 c->mask |= mask & SD_BUS_CREDS_WELL_KNOWN_NAMES;
727 r = bus_populate_creds_from_items(bus, conn_info, mask, c);
731 r = bus_creds_add_more(c, mask, 0, 0);
743 bus_kernel_cmd_free(bus, cmd->offset);
747 static int bus_get_name_creds_dbus1(
751 sd_bus_creds **creds) {
753 _cleanup_bus_message_unref_ sd_bus_message *reply_unique = NULL, *reply = NULL;
754 _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
755 const char *unique = NULL;
759 /* Only query the owner if the caller wants to know it or if
760 * the caller just wants to check whether a name exists */
761 if ((mask & SD_BUS_CREDS_UNIQUE_NAME) || mask == 0) {
762 r = sd_bus_call_method(
764 "org.freedesktop.DBus",
765 "/org/freedesktop/DBus",
766 "org.freedesktop.DBus",
775 r = sd_bus_message_read(reply_unique, "s", &unique);
785 if ((mask & SD_BUS_CREDS_UNIQUE_NAME) && unique) {
786 c->unique_name = strdup(unique);
790 c->mask |= SD_BUS_CREDS_UNIQUE_NAME;
793 if ((mask & SD_BUS_CREDS_PID) ||
794 ((mask & SD_BUS_CREDS_AUGMENT) &&
795 (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
796 SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID|
797 SD_BUS_CREDS_COMM|SD_BUS_CREDS_EXE|SD_BUS_CREDS_CMDLINE|
798 SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID|
799 SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS|
800 SD_BUS_CREDS_SELINUX_CONTEXT|
801 SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)))) {
805 r = sd_bus_call_method(
807 "org.freedesktop.DBus",
808 "/org/freedesktop/DBus",
809 "org.freedesktop.DBus",
810 "GetConnectionUnixProcessID",
814 unique ? unique : name);
818 r = sd_bus_message_read(reply, "u", &u);
823 if (mask & SD_BUS_CREDS_PID) {
825 c->mask |= SD_BUS_CREDS_PID;
828 reply = sd_bus_message_unref(reply);
831 if (mask & SD_BUS_CREDS_EUID) {
834 r = sd_bus_call_method(
836 "org.freedesktop.DBus",
837 "/org/freedesktop/DBus",
838 "org.freedesktop.DBus",
839 "GetConnectionUnixUser",
843 unique ? unique : name);
847 r = sd_bus_message_read(reply, "u", &u);
852 c->mask |= SD_BUS_CREDS_EUID;
854 reply = sd_bus_message_unref(reply);
857 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) {
858 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
859 const void *p = NULL;
862 r = sd_bus_call_method(
864 "org.freedesktop.DBus",
865 "/org/freedesktop/DBus",
866 "org.freedesktop.DBus",
867 "GetConnectionSELinuxSecurityContext",
871 unique ? unique : name);
873 if (!sd_bus_error_has_name(&error, "org.freedesktop.DBus.Error.SELinuxSecurityContextUnknown"))
876 r = sd_bus_message_read_array(reply, 'y', &p, &sz);
880 c->label = strndup(p, sz);
884 c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
888 r = bus_creds_add_more(c, mask, pid, 0);
901 _public_ int sd_bus_get_name_creds(
905 sd_bus_creds **creds) {
907 assert_return(bus, -EINVAL);
908 assert_return(name, -EINVAL);
909 assert_return((mask & ~SD_BUS_CREDS_AUGMENT) <= _SD_BUS_CREDS_ALL, -EOPNOTSUPP);
910 assert_return(mask == 0 || creds, -EINVAL);
911 assert_return(!bus_pid_changed(bus), -ECHILD);
912 assert_return(service_name_is_valid(name), -EINVAL);
914 if (!bus->bus_client)
917 if (streq(name, "org.freedesktop.DBus.Local"))
920 if (!BUS_IS_OPEN(bus->state))
924 return bus_get_name_creds_kdbus(bus, name, mask, false, creds);
926 return bus_get_name_creds_dbus1(bus, name, mask, creds);
929 static int bus_get_owner_creds_kdbus(sd_bus *bus, uint64_t mask, sd_bus_creds **ret) {
930 _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
931 struct kdbus_cmd_info cmd = {
932 .size = sizeof(struct kdbus_cmd_info),
934 struct kdbus_info *creator_info;
942 /* If augmentation is on, and the bus doesn't didn't allow us
943 * to get the bits we want, then ask for the PID/TID so that we
944 * can read the rest from /proc. */
945 if ((mask & SD_BUS_CREDS_AUGMENT) &&
946 (mask & (SD_BUS_CREDS_PPID|
947 SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
948 SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID|
949 SD_BUS_CREDS_COMM|SD_BUS_CREDS_TID_COMM|SD_BUS_CREDS_EXE|SD_BUS_CREDS_CMDLINE|
950 SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID|
951 SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS|
952 SD_BUS_CREDS_SELINUX_CONTEXT|
953 SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)))
954 mask |= SD_BUS_CREDS_PID;
956 cmd.attach_flags = attach_flags_to_kdbus(mask);
958 r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd);
962 creator_info = (struct kdbus_info *) ((uint8_t *) bus->kdbus_buffer + cmd.offset);
964 r = bus_populate_creds_from_items(bus, creator_info, mask, c);
965 bus_kernel_cmd_free(bus, cmd.offset);
969 r = bus_creds_add_more(c, mask, pid, 0);
978 static int bus_get_owner_creds_dbus1(sd_bus *bus, uint64_t mask, sd_bus_creds **ret) {
979 _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
983 if (!bus->ucred_valid && !isempty(bus->label))
990 if (bus->ucred_valid) {
991 if (bus->ucred.pid > 0) {
992 pid = c->pid = bus->ucred.pid;
993 c->mask |= SD_BUS_CREDS_PID & mask;
996 if (bus->ucred.uid != UID_INVALID) {
997 c->euid = bus->ucred.uid;
998 c->mask |= SD_BUS_CREDS_EUID & mask;
1001 if (bus->ucred.gid != GID_INVALID) {
1002 c->egid = bus->ucred.gid;
1003 c->mask |= SD_BUS_CREDS_EGID & mask;
1007 if (!isempty(bus->label) && (mask & SD_BUS_CREDS_SELINUX_CONTEXT)) {
1008 c->label = strdup(bus->label);
1012 c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
1015 r = bus_creds_add_more(c, mask, pid, 0);
1024 _public_ int sd_bus_get_owner_creds(sd_bus *bus, uint64_t mask, sd_bus_creds **ret) {
1025 assert_return(bus, -EINVAL);
1026 assert_return((mask & ~SD_BUS_CREDS_AUGMENT) <= _SD_BUS_CREDS_ALL, -EOPNOTSUPP);
1027 assert_return(ret, -EINVAL);
1028 assert_return(!bus_pid_changed(bus), -ECHILD);
1030 if (!BUS_IS_OPEN(bus->state))
1034 return bus_get_owner_creds_kdbus(bus, mask, ret);
1036 return bus_get_owner_creds_dbus1(bus, mask, ret);
1039 static int add_name_change_match(sd_bus *bus,
1042 const char *old_owner,
1043 const char *new_owner) {
1045 uint64_t name_id = KDBUS_MATCH_ID_ANY, old_owner_id = 0, new_owner_id = 0;
1046 int is_name_id = -1, r;
1047 struct kdbus_item *item;
1051 /* If we encounter a match that could match against
1052 * NameOwnerChanged messages, then we need to create
1053 * KDBUS_ITEM_NAME_{ADD,REMOVE,CHANGE} and
1054 * KDBUS_ITEM_ID_{ADD,REMOVE} matches for it, possibly
1055 * multiple if the match is underspecified.
1057 * The NameOwnerChanged signals take three parameters with
1058 * unique or well-known names, but only some forms actually
1061 * WELLKNOWN, "", UNIQUE → KDBUS_ITEM_NAME_ADD
1062 * WELLKNOWN, UNIQUE, "" → KDBUS_ITEM_NAME_REMOVE
1063 * WELLKNOWN, UNIQUE, UNIQUE → KDBUS_ITEM_NAME_CHANGE
1064 * UNIQUE, "", UNIQUE → KDBUS_ITEM_ID_ADD
1065 * UNIQUE, UNIQUE, "" → KDBUS_ITEM_ID_REMOVE
1067 * For the latter two the two unique names must be identical.
1072 is_name_id = bus_kernel_parse_unique_name(name, &name_id);
1077 if (!isempty(old_owner)) {
1078 r = bus_kernel_parse_unique_name(old_owner, &old_owner_id);
1083 if (is_name_id > 0 && old_owner_id != name_id)
1086 old_owner_id = KDBUS_MATCH_ID_ANY;
1088 if (!isempty(new_owner)) {
1089 r = bus_kernel_parse_unique_name(new_owner, &new_owner_id);
1094 if (is_name_id > 0 && new_owner_id != name_id)
1097 new_owner_id = KDBUS_MATCH_ID_ANY;
1099 if (is_name_id <= 0) {
1100 struct kdbus_cmd_match *m;
1103 /* If the name argument is missing or is a well-known
1104 * name, then add KDBUS_ITEM_NAME_{ADD,REMOVE,CHANGE}
1107 l = name ? strlen(name) + 1 : 0;
1109 sz = ALIGN8(offsetof(struct kdbus_cmd_match, items) +
1110 offsetof(struct kdbus_item, name_change) +
1111 offsetof(struct kdbus_notify_name_change, name) +
1114 m = alloca0_align(sz, 8);
1120 offsetof(struct kdbus_item, name_change) +
1121 offsetof(struct kdbus_notify_name_change, name) +
1124 item->name_change.old_id.id = old_owner_id;
1125 item->name_change.new_id.id = new_owner_id;
1128 memcpy(item->name_change.name, name, l);
1130 /* If the old name is unset or empty, then
1131 * this can match against added names */
1132 if (!old_owner || old_owner[0] == 0) {
1133 item->type = KDBUS_ITEM_NAME_ADD;
1135 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1140 /* If the new name is unset or empty, then
1141 * this can match against removed names */
1142 if (!new_owner || new_owner[0] == 0) {
1143 item->type = KDBUS_ITEM_NAME_REMOVE;
1145 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1150 /* The CHANGE match we need in either case, because
1151 * what is reported as a name change by the kernel
1152 * might just be an owner change between starter and
1153 * normal clients. For userspace such a change should
1154 * be considered a removal/addition, hence let's
1155 * subscribe to this unconditionally. */
1156 item->type = KDBUS_ITEM_NAME_CHANGE;
1157 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1162 if (is_name_id != 0) {
1163 struct kdbus_cmd_match *m;
1166 /* If the name argument is missing or is a unique
1167 * name, then add KDBUS_ITEM_ID_{ADD,REMOVE} matches
1170 sz = ALIGN8(offsetof(struct kdbus_cmd_match, items) +
1171 offsetof(struct kdbus_item, id_change) +
1172 sizeof(struct kdbus_notify_id_change));
1174 m = alloca0_align(sz, 8);
1180 offsetof(struct kdbus_item, id_change) +
1181 sizeof(struct kdbus_notify_id_change);
1182 item->id_change.id = name_id;
1184 /* If the old name is unset or empty, then this can
1185 * match against added ids */
1186 if (!old_owner || old_owner[0] == 0) {
1187 item->type = KDBUS_ITEM_ID_ADD;
1189 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1194 /* If thew new name is unset or empty, then this can
1195 * match against removed ids */
1196 if (!new_owner || new_owner[0] == 0) {
1197 item->type = KDBUS_ITEM_ID_REMOVE;
1199 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1208 int bus_add_match_internal_kernel(
1210 struct bus_match_component *components,
1211 unsigned n_components,
1214 struct kdbus_cmd_match *m;
1215 struct kdbus_item *item;
1218 const char *sender = NULL;
1219 size_t sender_length = 0;
1220 uint64_t src_id = KDBUS_MATCH_ID_ANY;
1221 bool using_bloom = false;
1223 bool matches_name_change = true;
1224 const char *name_change_arg[3] = {};
1229 /* Monitor streams don't support matches, make this a NOP */
1230 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
1233 bloom = alloca0(bus->bloom_size);
1235 sz = ALIGN8(offsetof(struct kdbus_cmd_match, items));
1237 for (i = 0; i < n_components; i++) {
1238 struct bus_match_component *c = &components[i];
1242 case BUS_MATCH_SENDER:
1243 if (!streq(c->value_str, "org.freedesktop.DBus"))
1244 matches_name_change = false;
1246 r = bus_kernel_parse_unique_name(c->value_str, &src_id);
1250 sz += ALIGN8(offsetof(struct kdbus_item, id) + sizeof(uint64_t));
1252 sender = c->value_str;
1253 sender_length = strlen(sender);
1254 sz += ALIGN8(offsetof(struct kdbus_item, str) + sender_length + 1);
1259 case BUS_MATCH_MESSAGE_TYPE:
1260 if (c->value_u8 != SD_BUS_MESSAGE_SIGNAL)
1261 matches_name_change = false;
1263 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "message-type", bus_message_type_to_string(c->value_u8));
1267 case BUS_MATCH_INTERFACE:
1268 if (!streq(c->value_str, "org.freedesktop.DBus"))
1269 matches_name_change = false;
1271 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "interface", c->value_str);
1275 case BUS_MATCH_MEMBER:
1276 if (!streq(c->value_str, "NameOwnerChanged"))
1277 matches_name_change = false;
1279 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "member", c->value_str);
1283 case BUS_MATCH_PATH:
1284 if (!streq(c->value_str, "/org/freedesktop/DBus"))
1285 matches_name_change = false;
1287 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "path", c->value_str);
1291 case BUS_MATCH_PATH_NAMESPACE:
1292 if (!streq(c->value_str, "/")) {
1293 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "path-slash-prefix", c->value_str);
1298 case BUS_MATCH_ARG...BUS_MATCH_ARG_LAST: {
1299 char buf[sizeof("arg")-1 + 2 + 1];
1301 if (c->type - BUS_MATCH_ARG < 3)
1302 name_change_arg[c->type - BUS_MATCH_ARG] = c->value_str;
1304 xsprintf(buf, "arg%i", c->type - BUS_MATCH_ARG);
1305 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, buf, c->value_str);
1310 case BUS_MATCH_ARG_PATH...BUS_MATCH_ARG_PATH_LAST: {
1311 char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];
1313 xsprintf(buf, "arg%i-slash-prefix", c->type - BUS_MATCH_ARG_PATH);
1314 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, buf, c->value_str);
1319 case BUS_MATCH_ARG_NAMESPACE...BUS_MATCH_ARG_NAMESPACE_LAST: {
1320 char buf[sizeof("arg")-1 + 2 + sizeof("-dot-prefix")];
1322 xsprintf(buf, "arg%i-dot-prefix", c->type - BUS_MATCH_ARG_NAMESPACE);
1323 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, buf, c->value_str);
1328 case BUS_MATCH_DESTINATION:
1329 /* The bloom filter does not include
1330 the destination, since it is only
1331 available for broadcast messages
1332 which do not carry a destination
1333 since they are undirected. */
1336 case BUS_MATCH_ROOT:
1337 case BUS_MATCH_VALUE:
1338 case BUS_MATCH_LEAF:
1339 case _BUS_MATCH_NODE_TYPE_MAX:
1340 case _BUS_MATCH_NODE_TYPE_INVALID:
1341 assert_not_reached("Invalid match type?");
1346 sz += ALIGN8(offsetof(struct kdbus_item, data64) + bus->bloom_size);
1348 m = alloca0_align(sz, 8);
1354 if (src_id != KDBUS_MATCH_ID_ANY) {
1355 item->size = offsetof(struct kdbus_item, id) + sizeof(uint64_t);
1356 item->type = KDBUS_ITEM_ID;
1358 item = KDBUS_ITEM_NEXT(item);
1362 item->size = offsetof(struct kdbus_item, data64) + bus->bloom_size;
1363 item->type = KDBUS_ITEM_BLOOM_MASK;
1364 memcpy(item->data64, bloom, bus->bloom_size);
1365 item = KDBUS_ITEM_NEXT(item);
1369 item->size = offsetof(struct kdbus_item, str) + sender_length + 1;
1370 item->type = KDBUS_ITEM_NAME;
1371 memcpy(item->str, sender, sender_length + 1);
1374 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1378 if (matches_name_change) {
1380 /* If this match could theoretically match
1381 * NameOwnerChanged messages, we need to
1382 * install a second non-bloom filter explitly
1385 r = add_name_change_match(bus, cookie, name_change_arg[0], name_change_arg[1], name_change_arg[2]);
1393 #define internal_match(bus, m) \
1394 ((bus)->hello_flags & KDBUS_HELLO_MONITOR \
1395 ? (isempty(m) ? "eavesdrop='true'" : strjoina((m), ",eavesdrop='true'")) \
1398 static int bus_add_match_internal_dbus1(
1400 const char *match) {
1407 e = internal_match(bus, match);
1409 return sd_bus_call_method(
1411 "org.freedesktop.DBus",
1412 "/org/freedesktop/DBus",
1413 "org.freedesktop.DBus",
1421 int bus_add_match_internal(
1424 struct bus_match_component *components,
1425 unsigned n_components,
1430 if (!bus->bus_client)
1434 return bus_add_match_internal_kernel(bus, components, n_components, cookie);
1436 return bus_add_match_internal_dbus1(bus, match);
1439 int bus_remove_match_internal_kernel(
1443 struct kdbus_cmd_match m = {
1444 .size = offsetof(struct kdbus_cmd_match, items),
1451 /* Monitor streams don't support matches, make this a NOP */
1452 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
1455 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_REMOVE, &m);
1462 static int bus_remove_match_internal_dbus1(
1464 const char *match) {
1471 e = internal_match(bus, match);
1473 return sd_bus_call_method(
1475 "org.freedesktop.DBus",
1476 "/org/freedesktop/DBus",
1477 "org.freedesktop.DBus",
1485 int bus_remove_match_internal(
1492 if (!bus->bus_client)
1496 return bus_remove_match_internal_kernel(bus, cookie);
1498 return bus_remove_match_internal_dbus1(bus, match);
1501 _public_ int sd_bus_get_name_machine_id(sd_bus *bus, const char *name, sd_id128_t *machine) {
1502 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL, *m = NULL;
1506 assert_return(bus, -EINVAL);
1507 assert_return(name, -EINVAL);
1508 assert_return(machine, -EINVAL);
1509 assert_return(!bus_pid_changed(bus), -ECHILD);
1510 assert_return(service_name_is_valid(name), -EINVAL);
1512 if (!bus->bus_client)
1515 if (!BUS_IS_OPEN(bus->state))
1518 if (streq_ptr(name, bus->unique_name))
1519 return sd_id128_get_machine(machine);
1521 r = sd_bus_message_new_method_call(
1526 "org.freedesktop.DBus.Peer",
1531 r = sd_bus_message_set_auto_start(m, false);
1535 r = sd_bus_call(bus, m, 0, NULL, &reply);
1539 r = sd_bus_message_read(reply, "s", &mid);
1543 return sd_id128_from_string(mid, machine);