/***
This file is part of systemd.
Copyright 2013 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see .
***/
#ifdef HAVE_VALGRIND_MEMCHECK_H
#include
#endif
#include
#include
#include "sd-bus.h"
#include "alloc-util.h"
#include "bus-bloom.h"
#include "bus-control.h"
#include "bus-internal.h"
#include "bus-message.h"
#include "bus-util.h"
#include "capability-util.h"
#include "stdio-util.h"
#include "string-util.h"
#include "strv.h"
#include "user-util.h"
_public_ int sd_bus_get_unique_name(sd_bus *bus, const char **unique) {
int r;
assert_return(bus, -EINVAL);
assert_return(unique, -EINVAL);
assert_return(!bus_pid_changed(bus), -ECHILD);
if (!bus->bus_client)
return -EINVAL;
r = bus_ensure_running(bus);
if (r < 0)
return r;
*unique = bus->unique_name;
return 0;
}
static int bus_request_name_dbus1(sd_bus *bus, const char *name, uint64_t flags) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
uint32_t ret, param = 0;
int r;
assert(bus);
assert(name);
if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
param |= BUS_NAME_ALLOW_REPLACEMENT;
if (flags & SD_BUS_NAME_REPLACE_EXISTING)
param |= BUS_NAME_REPLACE_EXISTING;
if (!(flags & SD_BUS_NAME_QUEUE))
param |= BUS_NAME_DO_NOT_QUEUE;
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"RequestName",
NULL,
&reply,
"su",
name,
param);
if (r < 0)
return r;
r = sd_bus_message_read(reply, "u", &ret);
if (r < 0)
return r;
if (ret == BUS_NAME_ALREADY_OWNER)
return -EALREADY;
else if (ret == BUS_NAME_EXISTS)
return -EEXIST;
else if (ret == BUS_NAME_IN_QUEUE)
return 0;
else if (ret == BUS_NAME_PRIMARY_OWNER)
return 1;
return -EIO;
}
_public_ int sd_bus_request_name(sd_bus *bus, const char *name, uint64_t flags) {
assert_return(bus, -EINVAL);
assert_return(name, -EINVAL);
assert_return(!bus_pid_changed(bus), -ECHILD);
assert_return(!(flags & ~(SD_BUS_NAME_ALLOW_REPLACEMENT|SD_BUS_NAME_REPLACE_EXISTING|SD_BUS_NAME_QUEUE)), -EINVAL);
assert_return(service_name_is_valid(name), -EINVAL);
assert_return(name[0] != ':', -EINVAL);
if (!bus->bus_client)
return -EINVAL;
/* Don't allow requesting the special driver and local names */
if (STR_IN_SET(name, "org.freedesktop.DBus", "org.freedesktop.DBus.Local"))
return -EINVAL;
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
return bus_request_name_dbus1(bus, name, flags);
}
static int bus_release_name_dbus1(sd_bus *bus, const char *name) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
uint32_t ret;
int r;
assert(bus);
assert(name);
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"ReleaseName",
NULL,
&reply,
"s",
name);
if (r < 0)
return r;
r = sd_bus_message_read(reply, "u", &ret);
if (r < 0)
return r;
if (ret == BUS_NAME_NON_EXISTENT)
return -ESRCH;
if (ret == BUS_NAME_NOT_OWNER)
return -EADDRINUSE;
if (ret == BUS_NAME_RELEASED)
return 0;
return -EINVAL;
}
_public_ int sd_bus_release_name(sd_bus *bus, const char *name) {
assert_return(bus, -EINVAL);
assert_return(name, -EINVAL);
assert_return(!bus_pid_changed(bus), -ECHILD);
assert_return(service_name_is_valid(name), -EINVAL);
assert_return(name[0] != ':', -EINVAL);
if (!bus->bus_client)
return -EINVAL;
/* Don't allow releasing the special driver and local names */
if (STR_IN_SET(name, "org.freedesktop.DBus", "org.freedesktop.DBus.Local"))
return -EINVAL;
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
return bus_release_name_dbus1(bus, name);
}
static int bus_list_names_dbus1(sd_bus *bus, char ***acquired, char ***activatable) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_strv_free_ char **x = NULL, **y = NULL;
int r;
if (acquired) {
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"ListNames",
NULL,
&reply,
NULL);
if (r < 0)
return r;
r = sd_bus_message_read_strv(reply, &x);
if (r < 0)
return r;
reply = sd_bus_message_unref(reply);
}
if (activatable) {
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"ListActivatableNames",
NULL,
&reply,
NULL);
if (r < 0)
return r;
r = sd_bus_message_read_strv(reply, &y);
if (r < 0)
return r;
*activatable = y;
y = NULL;
}
if (acquired) {
*acquired = x;
x = NULL;
}
return 0;
}
_public_ int sd_bus_list_names(sd_bus *bus, char ***acquired, char ***activatable) {
assert_return(bus, -EINVAL);
assert_return(acquired || activatable, -EINVAL);
assert_return(!bus_pid_changed(bus), -ECHILD);
if (!bus->bus_client)
return -EINVAL;
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
return bus_list_names_dbus1(bus, acquired, activatable);
}
static int bus_get_name_creds_dbus1(
sd_bus *bus,
const char *name,
uint64_t mask,
sd_bus_creds **creds) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply_unique = NULL, *reply = NULL;
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *c = NULL;
const char *unique = NULL;
pid_t pid = 0;
int r;
/* Only query the owner if the caller wants to know it or if
* the caller just wants to check whether a name exists */
if ((mask & SD_BUS_CREDS_UNIQUE_NAME) || mask == 0) {
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"GetNameOwner",
NULL,
&reply_unique,
"s",
name);
if (r < 0)
return r;
r = sd_bus_message_read(reply_unique, "s", &unique);
if (r < 0)
return r;
}
if (mask != 0) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
bool need_pid, need_uid, need_selinux, need_separate_calls;
c = bus_creds_new();
if (!c)
return -ENOMEM;
if ((mask & SD_BUS_CREDS_UNIQUE_NAME) && unique) {
c->unique_name = strdup(unique);
if (!c->unique_name)
return -ENOMEM;
c->mask |= SD_BUS_CREDS_UNIQUE_NAME;
}
need_pid = (mask & SD_BUS_CREDS_PID) ||
((mask & SD_BUS_CREDS_AUGMENT) &&
(mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID|
SD_BUS_CREDS_SUPPLEMENTARY_GIDS|
SD_BUS_CREDS_COMM|SD_BUS_CREDS_EXE|SD_BUS_CREDS_CMDLINE|
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|
SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS|
SD_BUS_CREDS_SELINUX_CONTEXT|
SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)));
need_uid = mask & SD_BUS_CREDS_EUID;
need_selinux = mask & SD_BUS_CREDS_SELINUX_CONTEXT;
if (need_pid + need_uid + need_selinux > 1) {
/* If we need more than one of the credentials, then use GetConnectionCredentials() */
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"GetConnectionCredentials",
&error,
&reply,
"s",
unique ?: name);
if (r < 0) {
if (!sd_bus_error_has_name(&error, SD_BUS_ERROR_UNKNOWN_METHOD))
return r;
/* If we got an unknown method error, fall back to the invidual calls... */
need_separate_calls = true;
sd_bus_error_free(&error);
} else {
need_separate_calls = false;
r = sd_bus_message_enter_container(reply, 'a', "{sv}");
if (r < 0)
return r;
for (;;) {
const char *m;
r = sd_bus_message_enter_container(reply, 'e', "sv");
if (r < 0)
return r;
if (r == 0)
break;
r = sd_bus_message_read(reply, "s", &m);
if (r < 0)
return r;
if (need_uid && streq(m, "UnixUserID")) {
uint32_t u;
r = sd_bus_message_read(reply, "v", "u", &u);
if (r < 0)
return r;
c->euid = u;
c->mask |= SD_BUS_CREDS_EUID;
} else if (need_pid && streq(m, "ProcessID")) {
uint32_t p;
r = sd_bus_message_read(reply, "v", "u", &p);
if (r < 0)
return r;
pid = p;
if (mask & SD_BUS_CREDS_PID) {
c->pid = p;
c->mask |= SD_BUS_CREDS_PID;
}
} else if (need_selinux && streq(m, "LinuxSecurityLabel")) {
const void *p = NULL;
size_t sz = 0;
r = sd_bus_message_enter_container(reply, 'v', "ay");
if (r < 0)
return r;
r = sd_bus_message_read_array(reply, 'y', &p, &sz);
if (r < 0)
return r;
free(c->label);
c->label = strndup(p, sz);
if (!c->label)
return -ENOMEM;
c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
r = sd_bus_message_exit_container(reply);
if (r < 0)
return r;
} else {
r = sd_bus_message_skip(reply, "v");
if (r < 0)
return r;
}
r = sd_bus_message_exit_container(reply);
if (r < 0)
return r;
}
r = sd_bus_message_exit_container(reply);
if (r < 0)
return r;
if (need_pid && pid == 0)
return -EPROTO;
}
} else /* When we only need a single field, then let's use separate calls */
need_separate_calls = true;
if (need_separate_calls) {
if (need_pid) {
uint32_t u;
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"GetConnectionUnixProcessID",
NULL,
&reply,
"s",
unique ?: name);
if (r < 0)
return r;
r = sd_bus_message_read(reply, "u", &u);
if (r < 0)
return r;
pid = u;
if (mask & SD_BUS_CREDS_PID) {
c->pid = u;
c->mask |= SD_BUS_CREDS_PID;
}
reply = sd_bus_message_unref(reply);
}
if (need_uid) {
uint32_t u;
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"GetConnectionUnixUser",
NULL,
&reply,
"s",
unique ? unique : name);
if (r < 0)
return r;
r = sd_bus_message_read(reply, "u", &u);
if (r < 0)
return r;
c->euid = u;
c->mask |= SD_BUS_CREDS_EUID;
reply = sd_bus_message_unref(reply);
}
if (need_selinux) {
const void *p = NULL;
size_t sz = 0;
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"GetConnectionSELinuxSecurityContext",
&error,
&reply,
"s",
unique ? unique : name);
if (r < 0) {
if (!sd_bus_error_has_name(&error, "org.freedesktop.DBus.Error.SELinuxSecurityContextUnknown"))
return r;
/* no data is fine */
} else {
r = sd_bus_message_read_array(reply, 'y', &p, &sz);
if (r < 0)
return r;
c->label = strndup(p, sz);
if (!c->label)
return -ENOMEM;
c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
}
}
}
r = bus_creds_add_more(c, mask, pid, 0);
if (r < 0)
return r;
}
if (creds) {
*creds = c;
c = NULL;
}
return 0;
}
_public_ int sd_bus_get_name_creds(
sd_bus *bus,
const char *name,
uint64_t mask,
sd_bus_creds **creds) {
assert_return(bus, -EINVAL);
assert_return(name, -EINVAL);
assert_return((mask & ~SD_BUS_CREDS_AUGMENT) <= _SD_BUS_CREDS_ALL, -EOPNOTSUPP);
assert_return(mask == 0 || creds, -EINVAL);
assert_return(!bus_pid_changed(bus), -ECHILD);
assert_return(service_name_is_valid(name), -EINVAL);
if (!bus->bus_client)
return -EINVAL;
/* Turn off augmenting if this isn't a local connection. If the connection is not local, then /proc is not
* going to match. */
if (!bus->is_local)
mask &= ~SD_BUS_CREDS_AUGMENT;
if (streq(name, "org.freedesktop.DBus.Local"))
return -EINVAL;
if (streq(name, "org.freedesktop.DBus"))
return sd_bus_get_owner_creds(bus, mask, creds);
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
return bus_get_name_creds_dbus1(bus, name, mask, creds);
}
static int bus_get_owner_creds_dbus1(sd_bus *bus, uint64_t mask, sd_bus_creds **ret) {
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *c = NULL;
pid_t pid = 0;
bool do_label;
int r;
assert(bus);
do_label = bus->label && (mask & SD_BUS_CREDS_SELINUX_CONTEXT);
/* Avoid allocating anything if we have no chance of returning useful data */
if (!bus->ucred_valid && !do_label)
return -ENODATA;
c = bus_creds_new();
if (!c)
return -ENOMEM;
if (bus->ucred_valid) {
if (bus->ucred.pid > 0) {
pid = c->pid = bus->ucred.pid;
c->mask |= SD_BUS_CREDS_PID & mask;
}
if (bus->ucred.uid != UID_INVALID) {
c->euid = bus->ucred.uid;
c->mask |= SD_BUS_CREDS_EUID & mask;
}
if (bus->ucred.gid != GID_INVALID) {
c->egid = bus->ucred.gid;
c->mask |= SD_BUS_CREDS_EGID & mask;
}
}
if (do_label) {
c->label = strdup(bus->label);
if (!c->label)
return -ENOMEM;
c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
}
r = bus_creds_add_more(c, mask, pid, 0);
if (r < 0)
return r;
*ret = c;
c = NULL;
return 0;
}
_public_ int sd_bus_get_owner_creds(sd_bus *bus, uint64_t mask, sd_bus_creds **ret) {
assert_return(bus, -EINVAL);
assert_return((mask & ~SD_BUS_CREDS_AUGMENT) <= _SD_BUS_CREDS_ALL, -EOPNOTSUPP);
assert_return(ret, -EINVAL);
assert_return(!bus_pid_changed(bus), -ECHILD);
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
if (!bus->is_local)
mask &= ~SD_BUS_CREDS_AUGMENT;
return bus_get_owner_creds_dbus1(bus, mask, ret);
}
#define internal_match(bus, m) \
((bus)->hello_flags & KDBUS_HELLO_MONITOR \
? (isempty(m) ? "eavesdrop='true'" : strjoina((m), ",eavesdrop='true'")) \
: (m))
static int bus_add_match_internal_dbus1(
sd_bus *bus,
const char *match) {
const char *e;
assert(bus);
assert(match);
e = internal_match(bus, match);
return sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"AddMatch",
NULL,
NULL,
"s",
e);
}
int bus_add_match_internal(
sd_bus *bus,
const char *match,
struct bus_match_component *components,
unsigned n_components,
uint64_t cookie) {
assert(bus);
if (!bus->bus_client)
return -EINVAL;
return bus_add_match_internal_dbus1(bus, match);
}
static int bus_remove_match_internal_dbus1(
sd_bus *bus,
const char *match) {
const char *e;
assert(bus);
assert(match);
e = internal_match(bus, match);
return sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"RemoveMatch",
NULL,
NULL,
"s",
e);
}
int bus_remove_match_internal(
sd_bus *bus,
const char *match,
uint64_t cookie) {
assert(bus);
if (!bus->bus_client)
return -EINVAL;
return bus_remove_match_internal_dbus1(bus, match);
}
#if 0 /// UNNEEDED by elogind
_public_ int sd_bus_get_name_machine_id(sd_bus *bus, const char *name, sd_id128_t *machine) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL, *m = NULL;
const char *mid;
int r;
assert_return(bus, -EINVAL);
assert_return(name, -EINVAL);
assert_return(machine, -EINVAL);
assert_return(!bus_pid_changed(bus), -ECHILD);
assert_return(service_name_is_valid(name), -EINVAL);
if (!bus->bus_client)
return -EINVAL;
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
if (streq_ptr(name, bus->unique_name))
return sd_id128_get_machine(machine);
r = sd_bus_message_new_method_call(
bus,
&m,
name,
"/",
"org.freedesktop.DBus.Peer",
"GetMachineId");
if (r < 0)
return r;
r = sd_bus_message_set_auto_start(m, false);
if (r < 0)
return r;
r = sd_bus_call(bus, m, 0, NULL, &reply);
if (r < 0)
return r;
r = sd_bus_message_read(reply, "s", &mid);
if (r < 0)
return r;
return sd_id128_from_string(mid, machine);
}
#endif // 0