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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | HISTORY | SEE ALSO | COLOPHON |
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SD_BUS_Q...DER_CREDS(3) sd_bus_query_sender_creds SD_BUS_Q...DER_CREDS(3)
sd_bus_query_sender_creds, sd_bus_query_sender_privilege - Query
bus message sender credentials/privileges
#include <systemd/sd-bus.h>
int sd_bus_query_sender_creds(sd_bus_message *m, uint64_t mask,
sd_bus_creds **creds);
sd_bus_error* sd_bus_query_sender_privilege(sd_bus_message *m,
int capability);
sd_bus_query_sender_creds() returns the credentials of the message
m. The mask parameter is a combo of SD_BUS_CREDS_* flags that
indicate which credential info the caller is interested in. See
sd_bus_creds_new_from_pid(3) for a list of possible flags. First,
this message checks if the requested credentials are attached to
the message itself. If not, but the message contains the pid of
the sender and the caller specified the SD_BUS_CREDS_AUGMENT flag,
this function tries to figure out the missing credentials via
other means (starting from the pid). If the PID is not available
but the message has a sender, this function calls
sd_bus_get_name_creds(3) to get the requested credentials. If the
message has no sender (when a direct connection is used), this
function calls sd_bus_get_owner_creds(3) to get the requested
credentials. On success, the requested credentials are stored in
creds. Ownership of the credentials object in creds is transferred
to the caller and should be freed by calling
sd_bus_creds_unref(3).
sd_bus_query_sender_privilege() checks if the message m has the
requested privileges. If capability is a non-negative integer,
this function checks if the message has the capability with the
same value. See capabilities(7) for a list of capabilities. If
capability is a negative integer, this function returns whether
the sender of the message runs as the same user as the receiver of
the message, or if the sender of the message runs as root and the
receiver of the message does not run as root. On success and if
the message has the requested privileges, this function returns a
positive integer. If the message does not have the requested
privileges, this function returns zero.
On success, these functions return a non-negative integer. On
failure, they return a negative errno-style error code.
Errors
Returned errors may indicate the following problems:
-EINVAL
The message m or an output parameter is NULL.
Added in version 246.
-ENOTCONN
The bus of m is not connected.
Added in version 246.
-ECHILD
The bus of m was created in a different process, library or
module instance.
Added in version 246.
-EPERM
The message m is not sealed.
Added in version 246.
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.
sd_bus_query_sender_creds() and sd_bus_query_sender_privilege()
were added in version 246.
systemd(1), sd-bus(3), sd_bus_creds_new_from_pid(3),
sd_bus_get_name_creds(3), sd_bus_get_owner_creds(3),
sd_bus_creds_unref(3), capabilities(7)
This page is part of the systemd (systemd system and service
manager) project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have a
bug report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
This page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2025-08-11. (At that
time, the date of the most recent commit that was found in the
repository was 2025-08-11.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
[email protected]
systemd 258~rc2 SD_BUS_Q...DER_CREDS(3)
Pages that refer to this page: sd-bus(3), sd_bus_add_object(3), systemd.directives(7), systemd.index(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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