mirror of
https://github.com/systemd/systemd.git
synced 2024-10-29 21:55:36 +03:00
bf876e3f3e
sd-bus objects use hashmaps, which use module-global state, so it is not safe to pass a sd-bus object created by a module instance to another module instance (e.g.: when two libraries static linking sd-bus are pulled in a single process). Initialize a random per-module origin id and store it in the object, and compare it when entering a public API, and error out if they don't match, together with the PID.
135 lines
6.2 KiB
XML
135 lines
6.2 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
|
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
|
|
|
|
<refentry id="sd_bus_query_sender_creds" xmlns:xi="http://www.w3.org/2001/XInclude">
|
|
|
|
<refentryinfo>
|
|
<title>sd_bus_query_sender_creds</title>
|
|
<productname>systemd</productname>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>sd_bus_query_sender_creds</refentrytitle>
|
|
<manvolnum>3</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>sd_bus_query_sender_creds</refname>
|
|
<refname>sd_bus_query_sender_privilege</refname>
|
|
|
|
<refpurpose>Query bus message sender credentials/privileges</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<funcsynopsis>
|
|
<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_query_sender_creds</function></funcdef>
|
|
<paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
|
|
<paramdef>uint64_t <parameter>mask</parameter></paramdef>
|
|
<paramdef>sd_bus_creds **<parameter>creds</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>sd_bus_error* <function>sd_bus_query_sender_privilege</function></funcdef>
|
|
<paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
|
|
<paramdef>int <parameter>capability</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para><function>sd_bus_query_sender_creds()</function> returns the credentials of the message
|
|
<parameter>m</parameter>. The <parameter>mask</parameter> parameter is a combo of
|
|
<constant index='false'>SD_BUS_CREDS_*</constant> flags that indicate which credential info the caller is
|
|
interested in. See
|
|
<citerefentry><refentrytitle>sd_bus_creds_new_from_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
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
|
|
<constant index='false'>SD_BUS_CREDS_AUGMENT</constant> 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
|
|
<citerefentry><refentrytitle>sd_bus_get_name_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
to get the requested credentials. If the message has no sender (when a direct connection is used), this
|
|
function calls
|
|
<citerefentry><refentrytitle>sd_bus_get_owner_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
to get the requested credentials. On success, the requested credentials are stored in
|
|
<parameter>creds</parameter>. Ownership of the credentials object in <parameter>creds</parameter> is
|
|
transferred to the caller and should be freed by calling
|
|
<citerefentry><refentrytitle>sd_bus_creds_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
|
|
</para>
|
|
|
|
<para><function>sd_bus_query_sender_privilege()</function> checks if the message <parameter>m</parameter>
|
|
has the requested privileges. If <parameter>capability</parameter> is a non-negative integer, this
|
|
function checks if the message has the capability with the same value. See
|
|
<citerefentry project='man-pages'><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
|
|
for a list of capabilities. If <parameter>capability</parameter> 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.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Return Value</title>
|
|
|
|
<para>On success, these functions return a non-negative integer. On failure, they return a negative
|
|
errno-style error code.</para>
|
|
|
|
<refsect2>
|
|
<title>Errors</title>
|
|
|
|
<para>Returned errors may indicate the following problems:</para>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><constant>-EINVAL</constant></term>
|
|
|
|
<listitem><para>The message <parameter>m</parameter> or an output parameter is
|
|
<constant>NULL</constant>.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><constant>-ENOTCONN</constant></term>
|
|
|
|
<listitem><para>The bus of <parameter>m</parameter> is not connected.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><constant>-ECHILD</constant></term>
|
|
|
|
<listitem><para>The bus of <parameter>m</parameter> was created in a different process, library or module instance.
|
|
</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><constant>-EPERM</constant></term>
|
|
|
|
<listitem><para>The message <parameter>m</parameter> is not sealed.</para></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect2>
|
|
</refsect1>
|
|
|
|
<xi:include href="libsystemd-pkgconfig.xml" />
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_bus_creds_new_from_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_bus_get_name_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_bus_get_owner_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_bus_creds_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
</refentry>
|