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sd-bus: Add sd_bus_query_sender_creds/privilege docs

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Daan De Meyer 2020-04-28 19:29:46 +02:00 committed by Zbigniew Jędrzejewski-Szmek
parent 2344aefccf
commit bac1b83217
4 changed files with 138 additions and 2 deletions
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1
man/rules/meson.build
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@ -378,6 +378,7 @@ manpages = [
['sd_bus_path_decode', 'sd_bus_path_decode_many', 'sd_bus_path_encode_many'],
''],
['sd_bus_process', '3', [], ''],
['sd_bus_query_sender_creds', '3', ['sd_bus_query_sender_privilege'], ''],
['sd_bus_reply_method_error',
'3',
['sd_bus_reply_method_errno',

2
man/sd-bus.xml
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@ -139,6 +139,8 @@
<citerefentry><refentrytitle>sd_bus_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_path_encode</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_process</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_query_sender_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_query_sender_privilege</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_reply_method_return</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_reply_method_error</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_request_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>,

133
man/sd_bus_query_sender_creds.xml Normal file
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@ -0,0 +1,133 @@
<?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+ -->
<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 &lt;systemd/sd-bus.h&gt;</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, 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.
</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>

4
src/systemd/sd-bus.h
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@ -385,8 +385,8 @@ int sd_bus_emit_interfaces_added(sd_bus *bus, const char *path, const char *inte
int sd_bus_emit_interfaces_removed_strv(sd_bus *bus, const char *path, char **interfaces);
int sd_bus_emit_interfaces_removed(sd_bus *bus, const char *path, const char *interface, ...) _sd_sentinel_;
int sd_bus_query_sender_creds(sd_bus_message *call, uint64_t mask, sd_bus_creds **creds);
int sd_bus_query_sender_privilege(sd_bus_message *call, int capability);
int sd_bus_query_sender_creds(sd_bus_message *m, uint64_t mask, sd_bus_creds **creds);
int sd_bus_query_sender_privilege(sd_bus_message *m, int capability);
int sd_bus_match_signal(sd_bus *bus, sd_bus_slot **ret, const char *sender, const char *path, const char *interface, const char *member, sd_bus_message_handler_t callback, void *userdata);
int sd_bus_match_signal_async(sd_bus *bus, sd_bus_slot **ret, const char *sender, const char *path, const char *interface, const char *member, sd_bus_message_handler_t match_callback, sd_bus_message_handler_t add_callback, void *userdata);