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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON |
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SD_BUS_QUERY_SENDER_CREDS(3)_bus_query_sender_credsBUS_QUERY_SENDER_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, 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.
-ENOTCONN
The bus of m is not connected.
-ECHILD
The bus of m was created in a different process.
-EPERM
The message m is not sealed.
These APIs are implemented as a shared library, which can be compiled
and linked to with the libsystemd pkg-config(1) file.
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 2020-08-13. (At that
time, the date of the most recent commit that was found in the repos‐
itory was 2020-08-11.) 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 man-pages@man7.org
systemd 246 SD_BUS_QUERY_SENDER_CREDS(3)
Pages that refer to this page: sd-bus(3), 30-systemd-environment-d-generator(7), systemd.directives(7), systemd.index(7)
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