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;
982 bool do_label = bus->label && (mask & SD_BUS_CREDS_SELINUX_CONTEXT);
984 /* Avoid allocating anything if we have no chance of returning useful data */
985 if (!bus->ucred_valid && !do_label)
992 if (bus->ucred_valid) {
993 if (bus->ucred.pid > 0) {
994 pid = c->pid = bus->ucred.pid;
995 c->mask |= SD_BUS_CREDS_PID & mask;
998 if (bus->ucred.uid != UID_INVALID) {
999 c->euid = bus->ucred.uid;
1000 c->mask |= SD_BUS_CREDS_EUID & mask;
1003 if (bus->ucred.gid != GID_INVALID) {
1004 c->egid = bus->ucred.gid;
1005 c->mask |= SD_BUS_CREDS_EGID & mask;
1010 c->label = strdup(bus->label);
1014 c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
1017 r = bus_creds_add_more(c, mask, pid, 0);
1026 _public_ int sd_bus_get_owner_creds(sd_bus *bus, uint64_t mask, sd_bus_creds **ret) {
1027 assert_return(bus, -EINVAL);
1028 assert_return((mask & ~SD_BUS_CREDS_AUGMENT) <= _SD_BUS_CREDS_ALL, -EOPNOTSUPP);
1029 assert_return(ret, -EINVAL);
1030 assert_return(!bus_pid_changed(bus), -ECHILD);
1032 if (!BUS_IS_OPEN(bus->state))
1036 return bus_get_owner_creds_kdbus(bus, mask, ret);
1038 return bus_get_owner_creds_dbus1(bus, mask, ret);
1041 static int add_name_change_match(sd_bus *bus,
1044 const char *old_owner,
1045 const char *new_owner) {
1047 uint64_t name_id = KDBUS_MATCH_ID_ANY, old_owner_id = 0, new_owner_id = 0;
1048 int is_name_id = -1, r;
1049 struct kdbus_item *item;
1053 /* If we encounter a match that could match against
1054 * NameOwnerChanged messages, then we need to create
1055 * KDBUS_ITEM_NAME_{ADD,REMOVE,CHANGE} and
1056 * KDBUS_ITEM_ID_{ADD,REMOVE} matches for it, possibly
1057 * multiple if the match is underspecified.
1059 * The NameOwnerChanged signals take three parameters with
1060 * unique or well-known names, but only some forms actually
1063 * WELLKNOWN, "", UNIQUE → KDBUS_ITEM_NAME_ADD
1064 * WELLKNOWN, UNIQUE, "" → KDBUS_ITEM_NAME_REMOVE
1065 * WELLKNOWN, UNIQUE, UNIQUE → KDBUS_ITEM_NAME_CHANGE
1066 * UNIQUE, "", UNIQUE → KDBUS_ITEM_ID_ADD
1067 * UNIQUE, UNIQUE, "" → KDBUS_ITEM_ID_REMOVE
1069 * For the latter two the two unique names must be identical.
1074 is_name_id = bus_kernel_parse_unique_name(name, &name_id);
1079 if (!isempty(old_owner)) {
1080 r = bus_kernel_parse_unique_name(old_owner, &old_owner_id);
1085 if (is_name_id > 0 && old_owner_id != name_id)
1088 old_owner_id = KDBUS_MATCH_ID_ANY;
1090 if (!isempty(new_owner)) {
1091 r = bus_kernel_parse_unique_name(new_owner, &new_owner_id);
1096 if (is_name_id > 0 && new_owner_id != name_id)
1099 new_owner_id = KDBUS_MATCH_ID_ANY;
1101 if (is_name_id <= 0) {
1102 struct kdbus_cmd_match *m;
1105 /* If the name argument is missing or is a well-known
1106 * name, then add KDBUS_ITEM_NAME_{ADD,REMOVE,CHANGE}
1109 l = name ? strlen(name) + 1 : 0;
1111 sz = ALIGN8(offsetof(struct kdbus_cmd_match, items) +
1112 offsetof(struct kdbus_item, name_change) +
1113 offsetof(struct kdbus_notify_name_change, name) +
1116 m = alloca0_align(sz, 8);
1122 offsetof(struct kdbus_item, name_change) +
1123 offsetof(struct kdbus_notify_name_change, name) +
1126 item->name_change.old_id.id = old_owner_id;
1127 item->name_change.new_id.id = new_owner_id;
1130 memcpy(item->name_change.name, name, l);
1132 /* If the old name is unset or empty, then
1133 * this can match against added names */
1134 if (!old_owner || old_owner[0] == 0) {
1135 item->type = KDBUS_ITEM_NAME_ADD;
1137 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1142 /* If the new name is unset or empty, then
1143 * this can match against removed names */
1144 if (!new_owner || new_owner[0] == 0) {
1145 item->type = KDBUS_ITEM_NAME_REMOVE;
1147 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1152 /* The CHANGE match we need in either case, because
1153 * what is reported as a name change by the kernel
1154 * might just be an owner change between starter and
1155 * normal clients. For userspace such a change should
1156 * be considered a removal/addition, hence let's
1157 * subscribe to this unconditionally. */
1158 item->type = KDBUS_ITEM_NAME_CHANGE;
1159 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1164 if (is_name_id != 0) {
1165 struct kdbus_cmd_match *m;
1168 /* If the name argument is missing or is a unique
1169 * name, then add KDBUS_ITEM_ID_{ADD,REMOVE} matches
1172 sz = ALIGN8(offsetof(struct kdbus_cmd_match, items) +
1173 offsetof(struct kdbus_item, id_change) +
1174 sizeof(struct kdbus_notify_id_change));
1176 m = alloca0_align(sz, 8);
1182 offsetof(struct kdbus_item, id_change) +
1183 sizeof(struct kdbus_notify_id_change);
1184 item->id_change.id = name_id;
1186 /* If the old name is unset or empty, then this can
1187 * match against added ids */
1188 if (!old_owner || old_owner[0] == 0) {
1189 item->type = KDBUS_ITEM_ID_ADD;
1191 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1196 /* If thew new name is unset or empty, then this can
1197 * match against removed ids */
1198 if (!new_owner || new_owner[0] == 0) {
1199 item->type = KDBUS_ITEM_ID_REMOVE;
1201 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1210 int bus_add_match_internal_kernel(
1212 struct bus_match_component *components,
1213 unsigned n_components,
1216 struct kdbus_cmd_match *m;
1217 struct kdbus_item *item;
1220 const char *sender = NULL;
1221 size_t sender_length = 0;
1222 uint64_t src_id = KDBUS_MATCH_ID_ANY;
1223 bool using_bloom = false;
1225 bool matches_name_change = true;
1226 const char *name_change_arg[3] = {};
1231 /* Monitor streams don't support matches, make this a NOP */
1232 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
1235 bloom = alloca0(bus->bloom_size);
1237 sz = ALIGN8(offsetof(struct kdbus_cmd_match, items));
1239 for (i = 0; i < n_components; i++) {
1240 struct bus_match_component *c = &components[i];
1244 case BUS_MATCH_SENDER:
1245 if (!streq(c->value_str, "org.freedesktop.DBus"))
1246 matches_name_change = false;
1248 r = bus_kernel_parse_unique_name(c->value_str, &src_id);
1252 sz += ALIGN8(offsetof(struct kdbus_item, id) + sizeof(uint64_t));
1254 sender = c->value_str;
1255 sender_length = strlen(sender);
1256 sz += ALIGN8(offsetof(struct kdbus_item, str) + sender_length + 1);
1261 case BUS_MATCH_MESSAGE_TYPE:
1262 if (c->value_u8 != SD_BUS_MESSAGE_SIGNAL)
1263 matches_name_change = false;
1265 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "message-type", bus_message_type_to_string(c->value_u8));
1269 case BUS_MATCH_INTERFACE:
1270 if (!streq(c->value_str, "org.freedesktop.DBus"))
1271 matches_name_change = false;
1273 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "interface", c->value_str);
1277 case BUS_MATCH_MEMBER:
1278 if (!streq(c->value_str, "NameOwnerChanged"))
1279 matches_name_change = false;
1281 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "member", c->value_str);
1285 case BUS_MATCH_PATH:
1286 if (!streq(c->value_str, "/org/freedesktop/DBus"))
1287 matches_name_change = false;
1289 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "path", c->value_str);
1293 case BUS_MATCH_PATH_NAMESPACE:
1294 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: {
1312 * XXX: DBus spec defines arg[0..63]path= matching to be
1313 * a two-way glob. That is, if either string is a prefix
1314 * of the other, it matches.
1315 * This is really hard to realize in bloom-filters, as
1316 * we would have to create a bloom-match for each prefix
1317 * of @c->value_str. This is excessive, hence we just
1318 * ignore all those matches and accept everything from
1319 * the kernel. People should really avoid those matches.
1320 * If they're used in real-life some day, we will have
1321 * to properly support multiple-matches here.
1326 case BUS_MATCH_ARG_NAMESPACE...BUS_MATCH_ARG_NAMESPACE_LAST: {
1327 char buf[sizeof("arg")-1 + 2 + sizeof("-dot-prefix")];
1329 xsprintf(buf, "arg%i-dot-prefix", c->type - BUS_MATCH_ARG_NAMESPACE);
1330 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, buf, c->value_str);
1335 case BUS_MATCH_DESTINATION:
1336 /* The bloom filter does not include
1337 the destination, since it is only
1338 available for broadcast messages
1339 which do not carry a destination
1340 since they are undirected. */
1343 case BUS_MATCH_ROOT:
1344 case BUS_MATCH_VALUE:
1345 case BUS_MATCH_LEAF:
1346 case _BUS_MATCH_NODE_TYPE_MAX:
1347 case _BUS_MATCH_NODE_TYPE_INVALID:
1348 assert_not_reached("Invalid match type?");
1353 sz += ALIGN8(offsetof(struct kdbus_item, data64) + bus->bloom_size);
1355 m = alloca0_align(sz, 8);
1361 if (src_id != KDBUS_MATCH_ID_ANY) {
1362 item->size = offsetof(struct kdbus_item, id) + sizeof(uint64_t);
1363 item->type = KDBUS_ITEM_ID;
1365 item = KDBUS_ITEM_NEXT(item);
1369 item->size = offsetof(struct kdbus_item, data64) + bus->bloom_size;
1370 item->type = KDBUS_ITEM_BLOOM_MASK;
1371 memcpy(item->data64, bloom, bus->bloom_size);
1372 item = KDBUS_ITEM_NEXT(item);
1376 item->size = offsetof(struct kdbus_item, str) + sender_length + 1;
1377 item->type = KDBUS_ITEM_NAME;
1378 memcpy(item->str, sender, sender_length + 1);
1381 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1385 if (matches_name_change) {
1387 /* If this match could theoretically match
1388 * NameOwnerChanged messages, we need to
1389 * install a second non-bloom filter explitly
1392 r = add_name_change_match(bus, cookie, name_change_arg[0], name_change_arg[1], name_change_arg[2]);
1400 #define internal_match(bus, m) \
1401 ((bus)->hello_flags & KDBUS_HELLO_MONITOR \
1402 ? (isempty(m) ? "eavesdrop='true'" : strjoina((m), ",eavesdrop='true'")) \
1405 static int bus_add_match_internal_dbus1(
1407 const char *match) {
1414 e = internal_match(bus, match);
1416 return sd_bus_call_method(
1418 "org.freedesktop.DBus",
1419 "/org/freedesktop/DBus",
1420 "org.freedesktop.DBus",
1428 int bus_add_match_internal(
1431 struct bus_match_component *components,
1432 unsigned n_components,
1437 if (!bus->bus_client)
1441 return bus_add_match_internal_kernel(bus, components, n_components, cookie);
1443 return bus_add_match_internal_dbus1(bus, match);
1446 int bus_remove_match_internal_kernel(
1450 struct kdbus_cmd_match m = {
1451 .size = offsetof(struct kdbus_cmd_match, items),
1458 /* Monitor streams don't support matches, make this a NOP */
1459 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
1462 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_REMOVE, &m);
1469 static int bus_remove_match_internal_dbus1(
1471 const char *match) {
1478 e = internal_match(bus, match);
1480 return sd_bus_call_method(
1482 "org.freedesktop.DBus",
1483 "/org/freedesktop/DBus",
1484 "org.freedesktop.DBus",
1492 int bus_remove_match_internal(
1499 if (!bus->bus_client)
1503 return bus_remove_match_internal_kernel(bus, cookie);
1505 return bus_remove_match_internal_dbus1(bus, match);
1508 _public_ int sd_bus_get_name_machine_id(sd_bus *bus, const char *name, sd_id128_t *machine) {
1509 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL, *m = NULL;
1513 assert_return(bus, -EINVAL);
1514 assert_return(name, -EINVAL);
1515 assert_return(machine, -EINVAL);
1516 assert_return(!bus_pid_changed(bus), -ECHILD);
1517 assert_return(service_name_is_valid(name), -EINVAL);
1519 if (!bus->bus_client)
1522 if (!BUS_IS_OPEN(bus->state))
1525 if (streq_ptr(name, bus->unique_name))
1526 return sd_id128_get_machine(machine);
1528 r = sd_bus_message_new_method_call(
1533 "org.freedesktop.DBus.Peer",
1538 r = sd_bus_message_set_auto_start(m, false);
1542 r = sd_bus_call(bus, m, 0, NULL, &reply);
1546 r = sd_bus_message_read(reply, "s", &mid);
1550 return sd_id128_from_string(mid, machine);