x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
SD_BUS_CREDS_GET_PID(3) sd_bus_creds_get_pid SD_BUS_CREDS_GET_PID(3)
NAME
sd_bus_creds_get_pid, sd_bus_creds_get_ppid, sd_bus_creds_get_tid,
sd_bus_creds_get_uid, sd_bus_creds_get_euid, sd_bus_creds_get_suid,
sd_bus_creds_get_fsuid, sd_bus_creds_get_gid, sd_bus_creds_get_egid,
sd_bus_creds_get_sgid, sd_bus_creds_get_fsgid,
sd_bus_creds_get_supplementary_gids, sd_bus_creds_get_comm,
sd_bus_creds_get_tid_comm, sd_bus_creds_get_exe,
sd_bus_creds_get_cmdline, sd_bus_creds_get_cgroup,
sd_bus_creds_get_unit, sd_bus_creds_get_slice,
sd_bus_creds_get_user_unit, sd_bus_creds_get_user_slice,
sd_bus_creds_get_session, sd_bus_creds_get_owner_uid,
sd_bus_creds_has_effective_cap, sd_bus_creds_has_permitted_cap,
sd_bus_creds_has_inheritable_cap, sd_bus_creds_has_bounding_cap,
sd_bus_creds_get_selinux_context, sd_bus_creds_get_audit_session_id,
sd_bus_creds_get_audit_login_uid, sd_bus_creds_get_tty,
sd_bus_creds_get_unique_name, sd_bus_creds_get_well_known_names,
sd_bus_creds_get_description - Retrieve fields from a credentials
object
SYNOPSIS
#include <systemd/sd-bus.h>
int sd_bus_creds_get_pid(sd_bus_creds *c, pid_t *pid);
int sd_bus_creds_get_ppid(sd_bus_creds *c, pid_t *ppid);
int sd_bus_creds_get_tid(sd_bus_creds *c, pid_t *tid);
int sd_bus_creds_get_uid(sd_bus_creds *c, uid_t *uid);
int sd_bus_creds_get_euid(sd_bus_creds *c, uid_t *uid);
int sd_bus_creds_get_suid(sd_bus_creds *c, uid_t *uid);
int sd_bus_creds_get_fsuid(sd_bus_creds *c, uid_t *uid);
int sd_bus_creds_get_gid(sd_bus_creds *c, gid_t *gid);
int sd_bus_creds_get_egid(sd_bus_creds *c, gid_t *gid);
int sd_bus_creds_get_sgid(sd_bus_creds *c, gid_t *gid);
int sd_bus_creds_get_fsgid(sd_bus_creds *c, gid_t *gid);
int sd_bus_creds_get_supplementary_gids(sd_bus_creds *c,
const gid_t **gids);
int sd_bus_creds_get_comm(sd_bus_creds *c, const char **comm);
int sd_bus_creds_get_tid_comm(sd_bus_creds *c, const char **comm);
int sd_bus_creds_get_exe(sd_bus_creds *c, const char **exe);
int sd_bus_creds_get_cmdline(sd_bus_creds *c, char ***cmdline);
int sd_bus_creds_get_cgroup(sd_bus_creds *c, const char **cgroup);
int sd_bus_creds_get_unit(sd_bus_creds *c, const char **unit);
int sd_bus_creds_get_slice(sd_bus_creds *c, const char **slice);
int sd_bus_creds_get_user_unit(sd_bus_creds *c, const char **unit);
int sd_bus_creds_get_user_slice(sd_bus_creds *c, const char **slice);
int sd_bus_creds_get_session(sd_bus_creds *c, const char **slice);
int sd_bus_creds_get_owner_uid(sd_bus_creds *c, uid_t *uid);
int sd_bus_creds_has_effective_cap(sd_bus_creds *c, int capability);
int sd_bus_creds_has_permitted_cap(sd_bus_creds *c, int capability);
int sd_bus_creds_has_inheritable_cap(sd_bus_creds *c, int capability);
int sd_bus_creds_has_bounding_cap(sd_bus_creds *c, int capability);
int sd_bus_creds_get_selinux_context(sd_bus_creds *c,
const char **context);
int sd_bus_creds_get_audit_session_id(sd_bus_creds *c,
uint32_t *sessionid);
int sd_bus_creds_get_audit_login_uid(sd_bus_creds *c, uid_t *loginuid);
int sd_bus_creds_get_tty(sd_bus_creds *c, const char **tty);
int sd_bus_creds_get_unique_name(sd_bus_creds *c, const char **name);
int sd_bus_creds_get_well_known_names(sd_bus_creds *c, char ***name);
int sd_bus_creds_get_description(sd_bus_creds *c, const char **name);
DESCRIPTION
These functions return credential information from an sd_bus_creds
object. Credential objects may be created with
sd_bus_creds_new_from_pid(3), in which case they describe the
credentials of the process identified by the specified PID, with
sd_bus_get_name_creds(3), in which case they describe the credentials
of a bus peer identified by the specified bus name, with
sd_bus_get_owner_creds(3), in which case they describe the credentials
of the creator of a bus, or with sd_bus_message_get_creds(3), in which
case they describe the credentials of the sender of the message.
Not all credential fields are part of every "sd_bus_creds" object. Use
sd_bus_creds_get_mask(3) to determine the mask of fields available.
sd_bus_creds_get_pid() will retrieve the PID (process identifier).
Similarly, sd_bus_creds_get_ppid() will retrieve the parent PID. Note
that PID 1 has no parent process, in which case -ENXIO is returned.
sd_bus_creds_get_tid() will retrieve the TID (thread identifier).
sd_bus_creds_get_uid() will retrieve the numeric UID (user identifier).
Similarly, sd_bus_creds_get_euid() returns the effective UID,
sd_bus_creds_get_suid() the saved UID and sd_bus_creds_get_fsuid() the
file system UID.
sd_bus_creds_get_gid() will retrieve the numeric GID (group
identifier). Similarly, sd_bus_creds_get_egid() returns the effective
GID, sd_bus_creds_get_sgid() the saved GID and sd_bus_creds_get_fsgid()
the file system GID.
sd_bus_creds_get_supplementary_gids() will retrieve the supplementary
GIDs list.
sd_bus_creds_get_comm() will retrieve the comm field (truncated name of
the executable, as stored in /proc/pid/comm).
sd_bus_creds_get_tid_comm() will retrieve the comm field of the thread
(as stored in /proc/pid/task/tid/comm).
sd_bus_creds_get_exe() will retrieve the path to the program executable
(as stored in the /proc/pid/exe link, but with the " (deleted)" suffix
removed). Note that kernel threads do not have an executable path, in
which case -ENXIO is returned. Note that this property should not be
used for more than explanatory information, in particular it should not
be used for security-relevant decisions. That's because the executable
might have been replaced or removed by the time the value can be
processed. Moreover, the kernel exports this information in an
ambiguous way (i.e. a deleted executable cannot be safely distinguished
from one whose name suffix is " (deleted)").
sd_bus_creds_get_cmdline() will retrieve an array of command line
arguments (as stored in /proc/pid/cmdline). Note that kernel threads do
not have a command line, in which case -ENXIO is returned.
sd_bus_creds_get_cgroup() will retrieve the control group path. See
Control Groups v2[1].
sd_bus_creds_get_unit() will retrieve the systemd unit name (in the
system instance of systemd) that the process is a part of. See
systemd.unit(5). For processes that are not part of a unit, returns
-ENXIO.
sd_bus_creds_get_user_unit() will retrieve the systemd unit name (in
the user instance of systemd) that the process is a part of. See
systemd.unit(5). For processes that are not part of a user unit,
returns -ENXIO.
sd_bus_creds_get_slice() will retrieve the systemd slice (a unit in the
system instance of systemd) that the process is a part of. See
systemd.slice(5). Similarly, sd_bus_creds_get_user_slice() retrieves
the systemd slice of the process, in the user instance of systemd.
sd_bus_creds_get_session() will retrieve the identifier of the login
session that the process is a part of. Please note the login session
may be limited to a stub process or two. User processes may instead be
started from their systemd user manager, e.g. GUI applications started
using DBus activation, as well as service processes which are shared
between multiple logins of the same user. For processes that are not
part of a session, returns -ENXIO.
sd_bus_creds_get_owner_uid() will retrieve the numeric UID (user
identifier) of the user who owns the user unit or login session that
the process is a part of. See systemd-logind.service(8). For processes
that are not part of a user unit or session, returns -ENXIO.
sd_bus_creds_has_effective_cap() will check whether the capability
specified by capability was set in the effective capabilities mask. A
positive return value means that it was set, zero means that it was not
set, and a negative return value indicates an error. See
capabilities(7) and the AmbientCapabilities= and CapabilityBoundingSet=
settings in systemd.exec(5).
sd_bus_creds_has_permitted_cap() is similar to
sd_bus_creds_has_effective_cap(), but will check the permitted
capabilities mask.
sd_bus_creds_has_inheritable_cap() is similar to
sd_bus_creds_has_effective_cap(), but will check the inheritable
capabilities mask.
sd_bus_creds_has_bounding_cap() is similar to
sd_bus_creds_has_effective_cap(), but will check the bounding
capabilities mask.
sd_bus_creds_get_selinux_context() will retrieve the SELinux security
context (label) of the process.
sd_bus_creds_get_audit_session_id() will retrieve the audit session
identifier of the process. Returns -ENXIO for processes that are not
part of an audit session.
sd_bus_creds_get_audit_login_uid() will retrieve the audit user login
identifier (the identifier of the user who is "responsible" for the
session). Returns -ENXIO for processes that are not part of an audit
session.
sd_bus_creds_get_tty() will retrieve the controlling TTY, without the
prefixing "/dev/". Returns -ENXIO for processes that have no
controlling TTY.
sd_bus_creds_get_unique_name() will retrieve the D-Bus unique name. See
The D-Bus specification[2].
sd_bus_creds_get_well_known_names() will retrieve the set of D-Bus
well-known names. See The D-Bus specification[2].
sd_bus_creds_get_description() will retrieve a descriptive name of the
bus connection of the peer. This name is useful to discern multiple bus
connections by the same peer, and may be altered by the peer with the
sd_bus_set_description(3) call.
All functions that take a const char** parameter will store the answer
there as an address of a NUL-terminated string. It will be valid as
long as c remains valid, and should not be freed or modified by the
caller.
All functions that take a char*** parameter will store the answer there
as an address of an array of strings. Each individual string is
NUL-terminated, and the array is NULL-terminated as a whole. It will be
valid as long as c remains valid, and should not be freed or modified
by the caller.
RETURN VALUE
On success, these calls return 0 or a positive integer. On failure,
these calls return a negative errno-style error code.
Errors
Returned errors may indicate the following problems:
-ENODATA
The given field is not available in the credentials object c.
-ENXIO
The given field is not specified for the described process or peer.
This will be returned by sd_bus_creds_get_unit(),
sd_bus_creds_get_slice(), sd_bus_creds_get_user_unit(),
sd_bus_creds_get_user_slice(), and sd_bus_creds_get_session() if
the process is not part of a systemd system unit, systemd user
unit, systemd slice, or logind session. It will be returned by
sd_bus_creds_get_owner_uid() if the process is not part of a
systemd user unit or logind session. It will also be returned by
sd_bus_creds_get_exe() and sd_bus_creds_get_cmdline() for kernel
threads (since these are not started from an executable binary, nor
have a command line), and by sd_bus_creds_get_audit_session_id()
and sd_bus_creds_get_audit_login_uid() when the process is not part
of an audit session, and sd_bus_creds_get_tty() if the process has
no controlling TTY.
-EINVAL
Specified pointer parameter is NULL.
-ENOMEM
Memory allocation failed.
NOTES
Functions described here are available as a shared library, which can
be compiled against and linked to with the libsystemd pkg-config(1)
file.
The code described here uses getenv(3), which is declared to be not
multi-thread-safe. This means that the code calling the functions
described here must not call setenv(3) from a parallel thread. It is
recommended to only do calls to setenv() from an early phase of the
program when no other threads have been started.
SEE ALSO
systemd(1), sd-bus(3), sd_bus_creds_new_from_pid(2), fork(2),
execve(2), credentials(7), free(3), proc(5), systemd.journal-fields(7)
NOTES
1. Control Groups v2
https://docs.kernel.org/admin-guide/cgroup-v2.html
2. The D-Bus specification
https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names-bus
systemd 254 SD_BUS_CREDS_GET_PID(3)
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