1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
|
<?xml version="1.0" encoding='UTF-8'?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
<refentry id="pam_exec">
<refmeta>
<refentrytitle>pam_exec</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo>
</refmeta>
<refnamediv id="pam_exec-name">
<refname>pam_exec</refname>
<refpurpose>PAM module which calls an external command</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis id="pam_exec-cmdsynopsis">
<command>pam_exec.so</command>
<arg choice="opt">
debug
</arg>
<arg choice="opt">
expose_authtok
</arg>
<arg choice="opt">
seteuid
</arg>
<arg choice="opt">
quiet
</arg>
<arg choice="opt">
stdout
</arg>
<arg choice="opt">
log=<replaceable>file</replaceable>
</arg>
<arg choice="opt">
type=<replaceable>type</replaceable>
</arg>
<arg choice="plain">
<replaceable>command</replaceable>
</arg>
<arg choice="opt">
<replaceable>...</replaceable>
</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id="pam_exec-description">
<title>DESCRIPTION</title>
<para>
pam_exec is a PAM module that can be used to run
an external command.
</para>
<para>
The child's environment is set to the current PAM environment list, as
returned by
<citerefentry>
<refentrytitle>pam_getenvlist</refentrytitle><manvolnum>3</manvolnum>
</citerefentry>
In addition, the following PAM items are
exported as environment variables: <emphasis>PAM_RHOST</emphasis>,
<emphasis>PAM_RUSER</emphasis>, <emphasis>PAM_SERVICE</emphasis>,
<emphasis>PAM_TTY</emphasis>, <emphasis>PAM_USER</emphasis> and
<emphasis>PAM_TYPE</emphasis>, which contains one of the module
types: <option>account</option>, <option>auth</option>,
<option>password</option>, <option>open_session</option> and
<option>close_session</option>.
</para>
<para>
Commands called by pam_exec need to be aware of that the user
can have controll over the environment.
</para>
</refsect1>
<refsect1 id="pam_exec-options">
<title>OPTIONS</title>
<para>
<variablelist>
<varlistentry>
<term>
<option>debug</option>
</term>
<listitem>
<para>
Print debug information.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>expose_authtok</option>
</term>
<listitem>
<para>
During authentication the calling command can read
the password from <citerefentry>
<refentrytitle>stdin</refentrytitle><manvolnum>3</manvolnum>
</citerefentry>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>log=<replaceable>file</replaceable></option>
</term>
<listitem>
<para>
The output of the command is appended to
<filename>file</filename>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>type=<replaceable>type</replaceable></option>
</term>
<listitem>
<para>
Only run the command if the module type matches the given type.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>stdout</option>
</term>
<listitem>
<para>
Per default the output of the executed command is written to <filename>/dev/null</filename>. With this option, the stdout output of the executed command is redirected to the calling application. It's in the responsibility of this application what happens with the output. The <option>log</option> option is ignored.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>quiet</option>
</term>
<listitem>
<para>
Per default pam_exec.so will echo the exit status of the
external command if it fails.
Specifying this option will suppress the message.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>seteuid</option>
</term>
<listitem>
<para>
Per default pam_exec.so will execute the external command
with the real user ID of the calling process.
Specifying this option means the command is run
with the effective user ID.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 id="pam_exec-types">
<title>MODULE TYPES PROVIDED</title>
<para>
All module types (<option>auth</option>, <option>account</option>,
<option>password</option> and <option>session</option>) are provided.
</para>
</refsect1>
<refsect1 id='pam_exec-return_values'>
<title>RETURN VALUES</title>
<para>
<variablelist>
<varlistentry>
<term>PAM_SUCCESS</term>
<listitem>
<para>
The external command was run successfully.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_SERVICE_ERR</term>
<listitem>
<para>
No argument or a wrong number of arguments were given.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_SYSTEM_ERR</term>
<listitem>
<para>
A system error occurred or the command to execute failed.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_IGNORE</term>
<listitem>
<para>
<function>pam_setcred</function> was called, which
does not execute the command. Or, the value given for the type=
parameter did not match the module type.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 id='pam_exec-examples'>
<title>EXAMPLES</title>
<para>
Add the following line to <filename>/etc/pam.d/passwd</filename> to
rebuild the NIS database after each local password change:
<programlisting>
password optional pam_exec.so seteuid /usr/bin/make -C /var/yp
</programlisting>
This will execute the command
<programlisting>make -C /var/yp</programlisting>
with effective user ID.
</para>
</refsect1>
<refsect1 id='pam_exec-see_also'>
<title>SEE ALSO</title>
<para>
<citerefentry>
<refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>
</para>
</refsect1>
<refsect1 id='pam_exec-author'>
<title>AUTHOR</title>
<para>
pam_exec was written by Thorsten Kukuk <kukuk@thkukuk.de> and
Josh Triplett <josh@joshtriplett.org>.
</para>
</refsect1>
</refentry>
|
