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3802a3d3 | 1 | <?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*--> |
4cf8496d | 2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" |
12b42c76 | 3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
4cf8496d ZJS |
4 | |
5 | <!-- | |
b975b0d5 | 6 | This file is part of systemd. |
4cf8496d | 7 | |
b975b0d5 | 8 | Copyright 2014 Zbigniew Jędrzejewski-Szmek |
4cf8496d | 9 | |
b975b0d5 ZJS |
10 | systemd is free software; you can redistribute it and/or modify it |
11 | under the terms of the GNU Lesser General Public License as published by | |
12 | the Free Software Foundation; either version 2.1 of the License, or | |
13 | (at your option) any later version. | |
4cf8496d | 14 | |
b975b0d5 ZJS |
15 | systemd is distributed in the hope that it will be useful, but |
16 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | Lesser General Public License for more details. | |
4cf8496d | 19 | |
b975b0d5 ZJS |
20 | You should have received a copy of the GNU Lesser General Public License |
21 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
4cf8496d ZJS |
22 | --> |
23 | ||
48f69d8f | 24 | <refentry id="sd_bus_creds_new_from_pid"> |
4cf8496d ZJS |
25 | |
26 | <refentryinfo> | |
27 | <title>sd_bus_creds_new_from_pid</title> | |
28 | <productname>systemd</productname> | |
29 | ||
30 | <authorgroup> | |
31 | <author> | |
32 | <contrib>A monkey with a typewriter</contrib> | |
33 | <firstname>Zbigniew</firstname> | |
34 | <surname>Jędrzejewski-Szmek</surname> | |
35 | <email>zbyszek@in.waw.pl</email> | |
36 | </author> | |
37 | </authorgroup> | |
38 | </refentryinfo> | |
39 | ||
40 | <refmeta> | |
41 | <refentrytitle>sd_bus_creds_new_from_pid</refentrytitle> | |
42 | <manvolnum>3</manvolnum> | |
43 | </refmeta> | |
44 | ||
45 | <refnamediv> | |
46 | <refname>sd_bus_creds_new_from_pid</refname> | |
47 | <refname>sd_bus_creds_get_mask</refname> | |
f6f7a984 | 48 | <refname>sd_bus_creds_get_augmented_mask</refname> |
4cf8496d ZJS |
49 | <refname>sd_bus_creds_ref</refname> |
50 | <refname>sd_bus_creds_unref</refname> | |
4afd3348 | 51 | <refname>sd_bus_creds_unrefp</refname> |
4cf8496d ZJS |
52 | |
53 | <refpurpose>Retrieve credentials object for the specified PID</refpurpose> | |
54 | </refnamediv> | |
55 | ||
56 | <refsynopsisdiv> | |
57 | <funcsynopsis> | |
58 | <funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo> | |
59 | ||
60 | <funcprototype> | |
61 | <funcdef>int <function>sd_bus_creds_new_from_pid</function></funcdef> | |
62 | <paramdef>pid_t <parameter>pid</parameter></paramdef> | |
63 | <paramdef>uint64_t <parameter>creds_mask</parameter></paramdef> | |
8dc385e7 | 64 | <paramdef>sd_bus_creds **<parameter>ret</parameter></paramdef> |
4cf8496d ZJS |
65 | </funcprototype> |
66 | ||
67 | <funcprototype> | |
68 | <funcdef>uint64_t <function>sd_bus_creds_get_mask</function></funcdef> | |
512e3bbc | 69 | <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef> |
4cf8496d ZJS |
70 | </funcprototype> |
71 | ||
f6f7a984 LP |
72 | <funcprototype> |
73 | <funcdef>uint64_t <function>sd_bus_creds_get_augmented_mask</function></funcdef> | |
512e3bbc | 74 | <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef> |
f6f7a984 LP |
75 | </funcprototype> |
76 | ||
4cf8496d | 77 | <funcprototype> |
8dc385e7 JE |
78 | <funcdef>sd_bus_creds *<function>sd_bus_creds_ref</function></funcdef> |
79 | <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef> | |
4cf8496d ZJS |
80 | </funcprototype> |
81 | ||
82 | <funcprototype> | |
8dc385e7 JE |
83 | <funcdef>sd_bus_creds *<function>sd_bus_creds_unref</function></funcdef> |
84 | <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef> | |
4cf8496d | 85 | </funcprototype> |
4afd3348 LP |
86 | |
87 | <funcprototype> | |
88 | <funcdef>void <function>sd_bus_creds_unrefp</function></funcdef> | |
89 | <paramdef>sd_bus_creds **<parameter>c</parameter></paramdef> | |
90 | </funcprototype> | |
4cf8496d ZJS |
91 | </funcsynopsis> |
92 | ||
93 | <para> | |
94 | <constant>SD_BUS_CREDS_PID</constant>, | |
f6f7a984 | 95 | <constant>SD_BUS_CREDS_PPID</constant>, |
4cf8496d ZJS |
96 | <constant>SD_BUS_CREDS_TID</constant>, |
97 | <constant>SD_BUS_CREDS_UID</constant>, | |
f6f7a984 LP |
98 | <constant>SD_BUS_CREDS_EUID</constant>, |
99 | <constant>SD_BUS_CREDS_SUID</constant>, | |
100 | <constant>SD_BUS_CREDS_FSUID</constant>, | |
4cf8496d | 101 | <constant>SD_BUS_CREDS_GID</constant>, |
f6f7a984 LP |
102 | <constant>SD_BUS_CREDS_EGID</constant>, |
103 | <constant>SD_BUS_CREDS_SGID</constant>, | |
104 | <constant>SD_BUS_CREDS_FSGID</constant>, | |
105 | <constant>SD_BUS_CREDS_SUPPLEMENTARY_GIDS</constant>, | |
4cf8496d ZJS |
106 | <constant>SD_BUS_CREDS_COMM</constant>, |
107 | <constant>SD_BUS_CREDS_TID_COMM</constant>, | |
108 | <constant>SD_BUS_CREDS_EXE</constant>, | |
109 | <constant>SD_BUS_CREDS_CMDLINE</constant>, | |
110 | <constant>SD_BUS_CREDS_CGROUP</constant>, | |
111 | <constant>SD_BUS_CREDS_UNIT</constant>, | |
4cf8496d | 112 | <constant>SD_BUS_CREDS_SLICE</constant>, |
f6f7a984 LP |
113 | <constant>SD_BUS_CREDS_USER_UNIT</constant>, |
114 | <constant>SD_BUS_CREDS_USER_SLICE</constant>, | |
4cf8496d ZJS |
115 | <constant>SD_BUS_CREDS_SESSION</constant>, |
116 | <constant>SD_BUS_CREDS_OWNER_UID</constant>, | |
117 | <constant>SD_BUS_CREDS_EFFECTIVE_CAPS</constant>, | |
118 | <constant>SD_BUS_CREDS_PERMITTED_CAPS</constant>, | |
119 | <constant>SD_BUS_CREDS_INHERITABLE_CAPS</constant>, | |
120 | <constant>SD_BUS_CREDS_BOUNDING_CAPS</constant>, | |
121 | <constant>SD_BUS_CREDS_SELINUX_CONTEXT</constant>, | |
122 | <constant>SD_BUS_CREDS_AUDIT_SESSION_ID</constant>, | |
123 | <constant>SD_BUS_CREDS_AUDIT_LOGIN_UID</constant>, | |
f6f7a984 | 124 | <constant>SD_BUS_CREDS_TTY</constant>, |
4cf8496d ZJS |
125 | <constant>SD_BUS_CREDS_UNIQUE_NAME</constant>, |
126 | <constant>SD_BUS_CREDS_WELL_KNOWN_NAMES</constant>, | |
f6f7a984 LP |
127 | <constant>SD_BUS_CREDS_DESCRIPTION</constant>, |
128 | <constant>SD_BUS_CREDS_AUGMENT</constant>, | |
4cf8496d ZJS |
129 | <constant>_SD_BUS_CREDS_ALL</constant> |
130 | </para> | |
131 | </refsynopsisdiv> | |
132 | ||
133 | <refsect1> | |
134 | <title>Description</title> | |
135 | ||
f6f7a984 LP |
136 | <para><function>sd_bus_creds_new_from_pid()</function> creates a |
137 | new credentials object and fills it with information about the | |
138 | process <parameter>pid</parameter>. The pointer to this object | |
a8eaaee7 | 139 | will be stored in the <parameter>ret</parameter> pointer. Note that |
f6f7a984 LP |
140 | credential objects may also be created and retrieved via |
141 | <citerefentry><refentrytitle>sd_bus_get_name_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
142 | <citerefentry><refentrytitle>sd_bus_get_owner_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
143 | and | |
144 | <citerefentry><refentrytitle>sd_bus_message_get_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para> | |
4cf8496d ZJS |
145 | |
146 | <para>The information that will be stored is determined by | |
147 | <parameter>creds_mask</parameter>. It may contain a subset of ORed | |
148 | constants <constant>SD_BUS_CREDS_PID</constant>, | |
f6f7a984 | 149 | <constant>SD_BUS_CREDS_PPID</constant>, |
4cf8496d ZJS |
150 | <constant>SD_BUS_CREDS_TID</constant>, |
151 | <constant>SD_BUS_CREDS_UID</constant>, | |
f6f7a984 LP |
152 | <constant>SD_BUS_CREDS_EUID</constant>, |
153 | <constant>SD_BUS_CREDS_SUID</constant>, | |
154 | <constant>SD_BUS_CREDS_FSUID</constant>, | |
4cf8496d | 155 | <constant>SD_BUS_CREDS_GID</constant>, |
f6f7a984 LP |
156 | <constant>SD_BUS_CREDS_EGID</constant>, |
157 | <constant>SD_BUS_CREDS_SGID</constant>, | |
158 | <constant>SD_BUS_CREDS_FSGID</constant>, | |
159 | <constant>SD_BUS_CREDS_SUPPLEMENTARY_GIDS</constant>, | |
4cf8496d ZJS |
160 | <constant>SD_BUS_CREDS_COMM</constant>, |
161 | <constant>SD_BUS_CREDS_TID_COMM</constant>, | |
162 | <constant>SD_BUS_CREDS_EXE</constant>, | |
163 | <constant>SD_BUS_CREDS_CMDLINE</constant>, | |
164 | <constant>SD_BUS_CREDS_CGROUP</constant>, | |
165 | <constant>SD_BUS_CREDS_UNIT</constant>, | |
4cf8496d | 166 | <constant>SD_BUS_CREDS_SLICE</constant>, |
f6f7a984 LP |
167 | <constant>SD_BUS_CREDS_USER_UNIT</constant>, |
168 | <constant>SD_BUS_CREDS_USER_SLICE</constant>, | |
4cf8496d ZJS |
169 | <constant>SD_BUS_CREDS_SESSION</constant>, |
170 | <constant>SD_BUS_CREDS_OWNER_UID</constant>, | |
171 | <constant>SD_BUS_CREDS_EFFECTIVE_CAPS</constant>, | |
172 | <constant>SD_BUS_CREDS_PERMITTED_CAPS</constant>, | |
173 | <constant>SD_BUS_CREDS_INHERITABLE_CAPS</constant>, | |
174 | <constant>SD_BUS_CREDS_BOUNDING_CAPS</constant>, | |
175 | <constant>SD_BUS_CREDS_SELINUX_CONTEXT</constant>, | |
176 | <constant>SD_BUS_CREDS_AUDIT_SESSION_ID</constant>, | |
177 | <constant>SD_BUS_CREDS_AUDIT_LOGIN_UID</constant>, | |
f6f7a984 | 178 | <constant>SD_BUS_CREDS_TTY</constant>, |
4cf8496d | 179 | <constant>SD_BUS_CREDS_UNIQUE_NAME</constant>, |
a8eaaee7 | 180 | <constant>SD_BUS_CREDS_WELL_KNOWN_NAMES</constant>, and |
f6f7a984 LP |
181 | <constant>SD_BUS_CREDS_DESCRIPTION</constant>. Use the special |
182 | value <constant>_SD_BUS_CREDS_ALL</constant> to request all | |
183 | supported fields. The <constant>SD_BUS_CREDS_AUGMENT</constant> | |
a8eaaee7 | 184 | constant may not be ORed into the mask for invocations of |
f6f7a984 | 185 | <function>sd_bus_creds_new_from_pid()</function>.</para> |
4cf8496d ZJS |
186 | |
187 | <para>Fields can be retrieved from the credentials object using | |
188 | <citerefentry><refentrytitle>sd_bus_creds_get_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
189 | and other functions which correspond directly to the constants | |
190 | listed above.</para> | |
191 | ||
f6f7a984 LP |
192 | <para>A mask of fields which were actually successfully retrieved |
193 | can be retrieved with | |
194 | <function>sd_bus_creds_get_mask()</function>. If the credentials | |
195 | object was created with | |
4cf8496d ZJS |
196 | <function>sd_bus_creds_new_from_pid()</function>, this will be a |
197 | subset of fields requested in <parameter>creds_mask</parameter>. | |
198 | </para> | |
199 | ||
b938cb90 | 200 | <para>Similar to <function>sd_bus_creds_get_mask()</function>, the |
f6f7a984 LP |
201 | function <function>sd_bus_creds_get_augmented_mask()</function> |
202 | returns a bitmask of field constants. The mask indicates which | |
203 | credential fields have been retrieved in a non-atomic fashion. For | |
204 | credential objects created via | |
b938cb90 | 205 | <function>sd_bus_creds_new_from_pid()</function>, this mask will be |
f6f7a984 LP |
206 | identical to the mask returned by |
207 | <function>sd_bus_creds_get_mask()</function>. However, for | |
208 | credential objects retrieved via | |
b938cb90 | 209 | <function>sd_bus_get_name_creds()</function>, this mask will be set |
f6f7a984 LP |
210 | for the credential fields that could not be determined atomically |
211 | at peer connection time, and which were later added by reading | |
212 | augmenting credential data from | |
a8eaaee7 | 213 | <filename>/proc</filename>. Similarly, for credential objects |
b938cb90 | 214 | retrieved via <function>sd_bus_get_owner_creds()</function>, the |
f6f7a984 | 215 | mask is set for the fields that could not be determined atomically |
a8eaaee7 | 216 | at bus creation time, but have been augmented. Similarly, for |
f6f7a984 | 217 | credential objects retrieved via |
b938cb90 | 218 | <function>sd_bus_message_get_creds()</function>, the mask is set |
f6f7a984 | 219 | for the fields that could not be determined atomically at message |
a8eaaee7 | 220 | sending time, but have been augmented. The mask returned by |
f6f7a984 LP |
221 | <function>sd_bus_creds_get_augmented_mask()</function> is always a |
222 | subset of (or identical to) the mask returned by | |
223 | <function>sd_bus_creds_get_mask()</function> for the same | |
224 | object. The latter call hence returns all credential fields | |
225 | available in the credential object, the former then marks the | |
226 | subset of those that have been augmented. Note that augmented | |
b938cb90 JE |
227 | fields are unsuitable for authorization decisions, as they may be |
228 | retrieved at different times, thus being subject to races. Hence, | |
f6f7a984 LP |
229 | augmented fields should be used exclusively for informational |
230 | purposes. | |
231 | </para> | |
232 | ||
233 | <para><function>sd_bus_creds_ref()</function> creates a new | |
4cf8496d ZJS |
234 | reference to the credentials object <parameter>c</parameter>. This |
235 | object will not be destroyed until | |
f6f7a984 | 236 | <function>sd_bus_creds_unref()</function> has been called as many |
4cf8496d | 237 | times plus once more. Once the reference count has dropped to zero, |
06b643e7 | 238 | <parameter>c</parameter> cannot be used anymore, so further |
4cf8496d ZJS |
239 | calls to <function>sd_bus_creds_ref(c)</function> or |
240 | <function>sd_bus_creds_unref(c)</function> are illegal.</para> | |
241 | ||
f6f7a984 | 242 | <para><function>sd_bus_creds_unref()</function> destroys a reference |
4cf8496d | 243 | to <parameter>c</parameter>.</para> |
4afd3348 LP |
244 | |
245 | <para><function>sd_bus_creds_unrefp()</function> is similar to | |
246 | <function>sd_bus_creds_unref()</function> but takes a pointer to a | |
247 | pointer to an <type>sd_bus_creds</type> object. This call is useful in | |
248 | conjunction with GCC's and LLVM's <ulink | |
249 | url="https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html">Clean-up | |
250 | Variable Attribute</ulink>. Note that this function is defined as | |
251 | inline function.</para> | |
252 | ||
253 | <para><function>sd_bus_creds_ref()</function>, | |
254 | <function>sd_bus_creds_unref()</function> and | |
255 | <function>sd_bus_creds_unrefp()</function> execute no operation if | |
256 | the passed in bus credentials object is | |
257 | <constant>NULL</constant>.</para> | |
258 | ||
4cf8496d ZJS |
259 | </refsect1> |
260 | ||
261 | <refsect1> | |
262 | <title>Return Value</title> | |
263 | ||
264 | <para>On success, <function>sd_bus_creds_new_from_pid()</function> | |
265 | returns 0 or a positive integer. On failure, it returns a negative | |
266 | errno-style error code.</para> | |
267 | ||
268 | <para><function>sd_bus_creds_get_mask()</function> returns the | |
269 | mask of successfully acquired fields.</para> | |
270 | ||
f6f7a984 LP |
271 | <para><function>sd_bus_creds_get_augmented_mask()</function> |
272 | returns the mask of fields that have been augmented from data in | |
273 | <filename>/proc</filename>, and are thus not suitable for | |
274 | authorization decisions.</para> | |
275 | ||
276 | <para><function>sd_bus_creds_ref()</function> always returns the | |
4cf8496d ZJS |
277 | argument.</para> |
278 | ||
f6f7a984 | 279 | <para><function>sd_bus_creds_unref()</function> always returns |
4cf8496d ZJS |
280 | <constant>NULL</constant>.</para> |
281 | </refsect1> | |
282 | ||
283 | <refsect1> | |
284 | <title>Reference ownership</title> | |
285 | ||
286 | <para>Function <function>sd_bus_creds_new_from_pid()</function> | |
287 | creates a new object and the caller owns the sole reference. When | |
288 | not needed anymore, this reference should be destroyed with | |
289 | <citerefentry><refentrytitle>sd_bus_creds_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>. | |
290 | </para> | |
291 | </refsect1> | |
292 | ||
293 | <refsect1> | |
294 | <title>Errors</title> | |
295 | ||
296 | <para>Returned errors may indicate the following problems:</para> | |
297 | ||
298 | <variablelist> | |
299 | ||
300 | <varlistentry> | |
8474b70c | 301 | <term><constant>-ESRCH</constant></term> |
4cf8496d ZJS |
302 | |
303 | <listitem><para>Specified <parameter>pid</parameter> could not | |
304 | be found.</para></listitem> | |
305 | </varlistentry> | |
306 | ||
307 | <varlistentry> | |
8474b70c | 308 | <term><constant>-EINVAL</constant></term> |
4cf8496d ZJS |
309 | |
310 | <listitem><para>Specified parameter is invalid | |
311 | (<constant>NULL</constant> in case of output | |
312 | parameters).</para></listitem> | |
313 | </varlistentry> | |
314 | ||
315 | <varlistentry> | |
8474b70c | 316 | <term><constant>-ENOMEM</constant></term> |
4cf8496d ZJS |
317 | |
318 | <listitem><para>Memory allocation failed.</para></listitem> | |
319 | </varlistentry> | |
f6f7a984 LP |
320 | |
321 | <varlistentry> | |
322 | <term><constant>-EOPNOTSUPP</constant></term> | |
323 | ||
324 | <listitem><para>One of the requested fields is unknown to the local system.</para></listitem> | |
325 | </varlistentry> | |
4cf8496d ZJS |
326 | </variablelist> |
327 | </refsect1> | |
328 | ||
329 | <refsect1> | |
330 | <title>Notes</title> | |
331 | ||
f6f7a984 LP |
332 | <para><function>sd_bus_creds_new_from_pid()</function> and the |
333 | other calls described here are available as a shared library, | |
334 | which can be compiled and linked to with the | |
335 | <constant>libsystemd</constant> <citerefentry | |
336 | project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
4cf8496d ZJS |
337 | file.</para> |
338 | </refsect1> | |
339 | ||
340 | <refsect1> | |
341 | <title>See Also</title> | |
342 | ||
343 | <para> | |
344 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
345 | <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
4cf8496d | 346 | <citerefentry><refentrytitle>sd_bus_creds_get_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry>, |
f6f7a984 LP |
347 | <citerefentry><refentrytitle>sd_bus_get_name_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>, |
348 | <citerefentry><refentrytitle>sd_bus_get_owner_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
349 | <citerefentry><refentrytitle>sd_bus_message_get_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
4cf8496d ZJS |
350 | </para> |
351 | </refsect1> | |
352 | ||
353 | </refentry> |