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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_credsSD_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 isn't 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 2024-06-14. (At that
time, the date of the most recent commit that was found in the
repository was 2024-06-13.) 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 257~devel 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 2024-06-26 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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