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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-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="sd_bus_query_sender_creds" xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_bus_query_sender_creds</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_bus_query_sender_creds</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_bus_query_sender_creds</refname>
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<refname>sd_bus_query_sender_privilege</refname>
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<refpurpose>Query bus message sender credentials/privileges</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>sd_bus_query_sender_creds</function></funcdef>
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<paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
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<paramdef>uint64_t <parameter>mask</parameter></paramdef>
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<paramdef>sd_bus_creds **<parameter>creds</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>sd_bus_error* <function>sd_bus_query_sender_privilege</function></funcdef>
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<paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
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<paramdef>int <parameter>capability</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><function>sd_bus_query_sender_creds()</function> returns the credentials of the message
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<parameter>m</parameter>. The <parameter>mask</parameter> parameter is a combo of
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<constant index='false'>SD_BUS_CREDS_*</constant> flags that indicate which credential info the caller is
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interested in. See
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<citerefentry><refentrytitle>sd_bus_creds_new_from_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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for a list of possible flags. First, this message checks if the requested credentials are attached to the
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message itself. If not, but the message contains the pid of the sender and the caller specified the
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<constant index='false'>SD_BUS_CREDS_AUGMENT</constant> flag, this function tries to figure out
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the missing credentials via other means (starting from the pid). If the pid isn't available but the
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message has a sender, this function calls
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<citerefentry><refentrytitle>sd_bus_get_name_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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to get the requested credentials. If the message has no sender (when a direct connection is used), this
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function calls
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<citerefentry><refentrytitle>sd_bus_get_owner_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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to get the requested credentials. On success, the requested credentials are stored in
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<parameter>creds</parameter>. Ownership of the credentials object in <parameter>creds</parameter> is
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transferred to the caller and should be freed by calling
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<citerefentry><refentrytitle>sd_bus_creds_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
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</para>
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<para><function>sd_bus_query_sender_privilege()</function> checks if the message <parameter>m</parameter>
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has the requested privileges. If <parameter>capability</parameter> is a non-negative integer, this
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function checks if the message has the capability with the same value. See
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<citerefentry project='man-pages'><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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for a list of capabilities. If <parameter>capability</parameter> is a negative integer, this function
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returns whether the sender of the message runs as the same user as the receiver of the message, or if the
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sender of the message runs as root and the receiver of the message does not run as root. On success and
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if the message has the requested privileges, this function returns a positive integer. If the message
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does not have the requested privileges, this function returns zero.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para>On success, these functions return a non-negative integer. On failure, they return a negative
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errno-style error code.</para>
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<refsect2>
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<title>Errors</title>
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<para>Returned errors may indicate the following problems:</para>
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<variablelist>
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<varlistentry>
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<term><constant>-EINVAL</constant></term>
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<listitem><para>The message <parameter>m</parameter> or an output parameter is
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<constant>NULL</constant>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ENOTCONN</constant></term>
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<listitem><para>The bus of <parameter>m</parameter> is not connected.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ECHILD</constant></term>
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<listitem><para>The bus of <parameter>m</parameter> was created in a different process, library or module instance.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-EPERM</constant></term>
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<listitem><para>The message <parameter>m</parameter> is not sealed.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect2>
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</refsect1>
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<xi:include href="libsystemd-pkgconfig.xml" />
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_creds_new_from_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_get_name_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_get_owner_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_creds_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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