source: chapter06/shadow.xml@ 4df29592

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Last change on this file since 4df29592 was 4df29592, checked in by Matthew Burgess <matthew@…>, 17 years ago

Fix the sed that disabled the installation of the groups.1 man page. It resulted in a few other man pages not being installed too.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@8133 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

  • Property mode set to 100644
File size: 19.3 KB
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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-shadow" role="wrap">
9 <?dbhtml filename="shadow.html"?>
10
11 <title>Shadow-&shadow-version;</title>
12
13 <indexterm zone="ch-system-shadow">
14 <primary sortas="a-Shadow">Shadow</primary>
15 </indexterm>
16
17 <sect2 role="package">
18 <title/>
19
20 <para>The Shadow package contains programs for handling passwords in a secure
21 way.</para>
22
23 <segmentedlist>
24 <segtitle>&buildtime;</segtitle>
25 <segtitle>&diskspace;</segtitle>
26
27 <seglistitem>
28 <seg>&shadow-ch6-sbu;</seg>
29 <seg>&shadow-ch6-du;</seg>
30 </seglistitem>
31 </segmentedlist>
32
33 </sect2>
34
35 <sect2 role="installation">
36 <title>Installation of Shadow</title>
37
38 <note>
39 <para>If you would like to enforce the use of strong passwords, refer to
40 <ulink url="&blfs-root;view/svn/postlfs/cracklib.html"/> for installing
41 Cracklib prior to building Shadow. Then add
42 <parameter>--with-libcrack</parameter> to the <command>configure</command>
43 command below.</para>
44 </note>
45
46 <para>Fix a bug in the <command>useradd</command> and
47 <command>usermod</command> programs which prevent them from accepting group
48 names rather than group ID numbers to the <option>-g</option> option:</para>
49
50<screen><userinput>patch -Np1 -i ../&shadow-useradd-patch;</userinput></screen>
51
52 <para>Prepare Shadow for compilation:</para>
53
54<screen><userinput>./configure --libdir=/lib --sysconfdir=/etc --enable-shared \
55 --without-selinux</userinput></screen>
56
57 <variablelist>
58 <title>The meaning of the configure options:</title>
59
60 <varlistentry>
61 <term><parameter>--without-selinux</parameter></term>
62 <listitem>
63 <para>Support for selinux is enabled by default, but selinux is not
64 built in a base LFS system. The <command>configure</command> script
65 will fail if this option is not used.</para>
66 </listitem>
67 </varlistentry>
68
69 </variablelist>
70
71 <para>Disable the installation of the <command>groups</command> program
72 and its man pages, as Coreutils provides a better version:</para>
73
74<screen><userinput>sed -i 's/groups$(EXEEXT) //' src/Makefile
75find man -name Makefile -exec sed -i 's/groups\.1 / /' {} \;</userinput></screen>
76
77 <para>Disable the installation of Chinese and Korean manual pages, since
78 Man-DB cannot format them properly:</para>
79
80<screen><userinput>sed -i -e 's/ ko//' -e 's/ zh_CN zh_TW//' man/Makefile</userinput></screen>
81
82 <para>Shadow supplies other manual pages in a UTF-8 encoding. Man-DB
83 can display these in the recommended encodings by using the
84 <command>convert-mans</command> script which we installed.</para>
85
86<screen><userinput>for i in de es fi fr id it pt_BR; do
87 convert-mans UTF-8 ISO-8859-1 man/${i}/*.?
88done
89
90for i in cs hu pl; do
91 convert-mans UTF-8 ISO-8859-2 man/${i}/*.?
92done
93
94convert-mans UTF-8 EUC-JP man/ja/*.?
95convert-mans UTF-8 KOI8-R man/ru/*.?
96convert-mans UTF-8 ISO-8859-9 man/tr/*.?</userinput></screen>
97
98 <para id="shadow-login_defs">Instead of using the default
99 <emphasis>crypt</emphasis> method, use the more secure
100 <emphasis>MD5</emphasis> method of password encryption, which also allows
101 passwords longer than 8 characters. It is also necessary to change the
102 obsolete <filename class="directory">/var/spool/mail</filename> location
103 for user mailboxes that Shadow uses by default to the <filename
104 class="directory">/var/mail</filename> location used currently.</para>
105
106<screen><userinput>sed -i -e 's@#MD5_CRYPT_ENAB.no@MD5_CRYPT_ENAB yes@' \
107 -e 's@/var/spool/mail@/var/mail@' etc/login.defs</userinput></screen>
108
109 <note>
110 <para>If you built Shadow with Cracklib support, run the following:</para>
111
112<screen role="nodump"><userinput>sed -i 's@DICTPATH.*@DICTPATH\t/lib/cracklib/pw_dict@' \
113 etc/login.defs</userinput></screen>
114 </note>
115
116 <para>Compile the package:</para>
117
118<screen><userinput>make</userinput></screen>
119
120 <para>This package does not come with a test suite.</para>
121
122 <para>Install the package:</para>
123
124<screen><userinput>make install</userinput></screen>
125
126 <para>Move a misplaced program to its proper location:</para>
127
128<screen><userinput>mv -v /usr/bin/passwd /bin</userinput></screen>
129
130 <para>Move Shadow's libraries to more appropriate locations:</para>
131
132<screen><userinput>mv -v /lib/libshadow.*a /usr/lib
133rm -v /lib/libshadow.so
134ln -sfv ../../lib/libshadow.so.0 /usr/lib/libshadow.so</userinput></screen>
135
136 </sect2>
137
138 <sect2 id="conf-shadow" role="configuration">
139 <title>Configuring Shadow</title>
140
141 <indexterm zone="conf-shadow">
142 <primary sortas="a-Shadow">Shadow</primary>
143 <secondary>configuring</secondary>
144 </indexterm>
145
146 <para>This package contains utilities to add, modify, and delete users and
147 groups; set and change their passwords; and perform other administrative
148 tasks. For a full explanation of what <emphasis>password shadowing</emphasis>
149 means, see the <filename>doc/HOWTO</filename> file within the unpacked
150 source tree. If using Shadow support, keep in mind that programs which need
151 to verify passwords (display managers, FTP programs, pop3 daemons, etc.)
152 must be Shadow-compliant. That is, they need to be able to work with
153 shadowed passwords.</para>
154
155 <para>To enable shadowed passwords, run the following command:</para>
156
157<screen><userinput>pwconv</userinput></screen>
158
159 <para>To enable shadowed group passwords, run:</para>
160
161<screen><userinput>grpconv</userinput></screen>
162
163 <para>Shadow's stock configuration for the <command>useradd</command>
164 utility is not suitable for LFS systems. Use the following commands to
165 change the default home directory for new users and prevent the creation of
166 mail spool files:</para>
167
168<screen><userinput>useradd -D -b /home
169sed -i 's/yes/no/' /etc/default/useradd</userinput></screen>
170
171 </sect2>
172
173 <sect2 role="configuration">
174 <title>Setting the root password</title>
175
176 <para>Choose a password for user <emphasis>root</emphasis> and set it
177 by running:</para>
178
179<screen role="nodump"><userinput>passwd root</userinput></screen>
180
181 </sect2>
182
183 <sect2 id="contents-shadow" role="content">
184 <title>Contents of Shadow</title>
185
186 <segmentedlist>
187 <segtitle>Installed programs</segtitle>
188 <segtitle>Installed libraries</segtitle>
189
190 <seglistitem>
191 <seg>chage, chfn, chgpasswd, chpasswd, chsh, expiry, faillog, gpasswd,
192 groupadd, groupdel, groupmems, groupmod, grpck, grpconv, grpunconv,
193 lastlog, login, logoutd, newgrp, newusers, nologin, passwd, pwck,
194 pwconv, pwunconv, sg (link to newgrp), su, useradd, userdel, usermod,
195 vigr (link to vipw), and vipw</seg>
196 <seg>libshadow.{a,so}</seg>
197 </seglistitem>
198 </segmentedlist>
199
200 <variablelist>
201 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
202 <?dbfo list-presentation="list"?>
203 <?dbhtml list-presentation="table"?>
204
205 <varlistentry id="chage">
206 <term><command>chage</command></term>
207 <listitem>
208 <para>Used to change the maximum number of days between obligatory
209 password changes</para>
210 <indexterm zone="ch-system-shadow chage">
211 <primary sortas="b-chage">chage</primary>
212 </indexterm>
213 </listitem>
214 </varlistentry>
215
216 <varlistentry id="chfn">
217 <term><command>chfn</command></term>
218 <listitem>
219 <para>Used to change a user's full name and other information</para>
220 <indexterm zone="ch-system-shadow chfn">
221 <primary sortas="b-chfn">chfn</primary>
222 </indexterm>
223 </listitem>
224 </varlistentry>
225
226 <varlistentry id="chgpasswd">
227 <term><command>chgpasswd</command></term>
228 <listitem>
229 <para>Used to update group passwords in batch mode</para>
230 <indexterm zone="ch-system-shadow chgpasswd">
231 <primary sortas="b-chgpasswd">chgpasswd</primary>
232 </indexterm>
233 </listitem>
234 </varlistentry>
235
236 <varlistentry id="chpasswd">
237 <term><command>chpasswd</command></term>
238 <listitem>
239 <para>Used to update user passwords in batch mode</para>
240 <indexterm zone="ch-system-shadow chpasswd">
241 <primary sortas="b-chpasswd">chpasswd</primary>
242 </indexterm>
243 </listitem>
244 </varlistentry>
245
246 <varlistentry id="chsh">
247 <term><command>chsh</command></term>
248 <listitem>
249 <para>Used to change a user's default login shell</para>
250 <indexterm zone="ch-system-shadow chsh">
251 <primary sortas="b-chsh">chsh</primary>
252 </indexterm>
253 </listitem>
254 </varlistentry>
255
256 <varlistentry id="expiry">
257 <term><command>expiry</command></term>
258 <listitem>
259 <para>Checks and enforces the current password expiration policy</para>
260 <indexterm zone="ch-system-shadow expiry">
261 <primary sortas="b-expiry">expiry</primary>
262 </indexterm>
263 </listitem>
264 </varlistentry>
265
266 <varlistentry id="faillog">
267 <term><command>faillog</command></term>
268 <listitem>
269 <para>Is used to examine the log of login failures, to set a maximum
270 number of failures before an account is blocked, or to reset the
271 failure count</para>
272 <indexterm zone="ch-system-shadow faillog">
273 <primary sortas="b-faillog">faillog</primary>
274 </indexterm>
275 </listitem>
276 </varlistentry>
277
278 <varlistentry id="gpasswd">
279 <term><command>gpasswd</command></term>
280 <listitem>
281 <para>Is used to add and delete members and administrators to
282 groups</para>
283 <indexterm zone="ch-system-shadow gpasswd">
284 <primary sortas="b-gpasswd">gpasswd</primary>
285 </indexterm>
286 </listitem>
287 </varlistentry>
288
289 <varlistentry id="groupadd">
290 <term><command>groupadd</command></term>
291 <listitem>
292 <para>Creates a group with the given name</para>
293 <indexterm zone="ch-system-shadow groupadd">
294 <primary sortas="b-groupadd">groupadd</primary>
295 </indexterm>
296 </listitem>
297 </varlistentry>
298
299 <varlistentry id="groupdel">
300 <term><command>groupdel</command></term>
301 <listitem>
302 <para>Deletes the group with the given name</para>
303 <indexterm zone="ch-system-shadow groupdel">
304 <primary sortas="b-groupdel">groupdel</primary>
305 </indexterm>
306 </listitem>
307 </varlistentry>
308
309 <varlistentry id="groupmems">
310 <term><command>groupmems</command></term>
311 <listitem>
312 <para>Allows a user to administer his/her own group membership list
313 without the requirement of super user privileges.</para>
314 <indexterm zone="ch-system-shadow groupmems">
315 <primary sortas="b-groupmems">groupmems</primary>
316 </indexterm>
317 </listitem>
318 </varlistentry>
319
320 <varlistentry id="groupmod">
321 <term><command>groupmod</command></term>
322 <listitem>
323 <para>Is used to modify the given group's name or GID</para>
324 <indexterm zone="ch-system-shadow groupmod">
325 <primary sortas="b-groupmod">groupmod</primary>
326 </indexterm>
327 </listitem>
328 </varlistentry>
329
330 <varlistentry id="grpck">
331 <term><command>grpck</command></term>
332 <listitem>
333 <para>Verifies the integrity of the group files
334 <filename>/etc/group</filename> and
335 <filename>/etc/gshadow</filename></para>
336 <indexterm zone="ch-system-shadow grpck">
337 <primary sortas="b-grpck">grpck</primary>
338 </indexterm>
339 </listitem>
340 </varlistentry>
341
342 <varlistentry id="grpconv">
343 <term><command>grpconv</command></term>
344 <listitem>
345 <para>Creates or updates the shadow group file from the normal
346 group file</para>
347 <indexterm zone="ch-system-shadow grpconv">
348 <primary sortas="b-grpconv">grpconv</primary>
349 </indexterm>
350 </listitem>
351 </varlistentry>
352
353 <varlistentry id="grpunconv">
354 <term><command>grpunconv</command></term>
355 <listitem>
356 <para>Updates <filename>/etc/group</filename> from
357 <filename>/etc/gshadow</filename> and then deletes the latter</para>
358 <indexterm zone="ch-system-shadow grpunconv">
359 <primary sortas="b-grpunconv">grpunconv</primary>
360 </indexterm>
361 </listitem>
362 </varlistentry>
363
364 <varlistentry id="lastlog">
365 <term><command>lastlog</command></term>
366 <listitem>
367 <para>Reports the most recent login of all users or of a
368 given user</para>
369 <indexterm zone="ch-system-shadow lastlog">
370 <primary sortas="b-lastlog">lastlog</primary>
371 </indexterm>
372 </listitem>
373 </varlistentry>
374
375 <varlistentry id="login">
376 <term><command>login</command></term>
377 <listitem>
378 <para>Is used by the system to let users sign on</para>
379 <indexterm zone="ch-system-shadow login">
380 <primary sortas="b-login">login</primary>
381 </indexterm>
382 </listitem>
383 </varlistentry>
384
385 <varlistentry id="logoutd">
386 <term><command>logoutd</command></term>
387 <listitem>
388 <para>Is a daemon used to enforce restrictions on log-on time
389 and ports</para>
390 <indexterm zone="ch-system-shadow logoutd">
391 <primary sortas="b-logoutd">logoutd</primary>
392 </indexterm>
393 </listitem>
394 </varlistentry>
395
396 <varlistentry id="newgrp">
397 <term><command>newgrp</command></term>
398 <listitem>
399 <para>Is used to change the current GID during a login session</para>
400 <indexterm zone="ch-system-shadow newgrp">
401 <primary sortas="b-newgrp">newgrp</primary>
402 </indexterm>
403 </listitem>
404 </varlistentry>
405
406 <varlistentry id="newusers">
407 <term><command>newusers</command></term>
408 <listitem>
409 <para>Is used to create or update an entire series of user
410 accounts</para>
411 <indexterm zone="ch-system-shadow newusers">
412 <primary sortas="b-newusers">newusers</primary>
413 </indexterm>
414 </listitem>
415 </varlistentry>
416
417 <varlistentry id="nologin">
418 <term><command>nologin</command></term>
419 <listitem>
420 <para>Displays a message that an account is not available. Designed
421 to be used as the default shell for accounts that have been
422 disabled</para>
423 <indexterm zone="ch-system-shadow nologin">
424 <primary sortas="b-nologin">nologin</primary>
425 </indexterm>
426 </listitem>
427 </varlistentry>
428
429 <varlistentry id="passwd">
430 <term><command>passwd</command></term>
431 <listitem>
432 <para>Is used to change the password for a user or group account</para>
433 <indexterm zone="ch-system-shadow passwd">
434 <primary sortas="b-passwd">passwd</primary>
435 </indexterm>
436 </listitem>
437 </varlistentry>
438
439 <varlistentry id="pwck">
440 <term><command>pwck</command></term>
441 <listitem>
442 <para>Verifies the integrity of the password files
443 <filename>/etc/passwd</filename> and
444 <filename>/etc/shadow</filename></para>
445 <indexterm zone="ch-system-shadow pwck">
446 <primary sortas="b-pwck">pwck</primary>
447 </indexterm>
448 </listitem>
449 </varlistentry>
450
451 <varlistentry id="pwconv">
452 <term><command>pwconv</command></term>
453 <listitem>
454 <para>Creates or updates the shadow password file from the normal
455 password file</para>
456 <indexterm zone="ch-system-shadow pwconv">
457 <primary sortas="b-pwconv">pwconv</primary>
458 </indexterm>
459 </listitem>
460 </varlistentry>
461
462 <varlistentry id="pwunconv">
463 <term><command>pwunconv</command></term>
464 <listitem>
465 <para>Updates <filename>/etc/passwd</filename> from
466 <filename>/etc/shadow</filename> and then deletes the latter</para>
467 <indexterm zone="ch-system-shadow pwunconv">
468 <primary sortas="b-pwunconv">pwunconv</primary>
469 </indexterm>
470 </listitem>
471 </varlistentry>
472
473 <varlistentry id="sg">
474 <term><command>sg</command></term>
475 <listitem>
476 <para>Executes a given command while the user's GID
477 is set to that of the given group</para>
478 <indexterm zone="ch-system-shadow sg">
479 <primary sortas="b-sg">sg</primary>
480 </indexterm>
481 </listitem>
482 </varlistentry>
483
484 <varlistentry id="su">
485 <term><command>su</command></term>
486 <listitem>
487 <para>Runs a shell with substitute user and group IDs</para>
488 <indexterm zone="ch-system-shadow su">
489 <primary sortas="b-su">su</primary>
490 </indexterm>
491 </listitem>
492 </varlistentry>
493
494 <varlistentry id="useradd">
495 <term><command>useradd</command></term>
496 <listitem>
497 <para>Creates a new user with the given name, or updates the default
498 new-user information</para>
499 <indexterm zone="ch-system-shadow useradd">
500 <primary sortas="b-useradd">useradd</primary>
501 </indexterm>
502 </listitem>
503 </varlistentry>
504
505 <varlistentry id="userdel">
506 <term><command>userdel</command></term>
507 <listitem>
508 <para>Deletes the given user account</para>
509 <indexterm zone="ch-system-shadow userdel">
510 <primary sortas="b-userdel">userdel</primary>
511 </indexterm>
512 </listitem>
513 </varlistentry>
514
515 <varlistentry id="usermod">
516 <term><command>usermod</command></term>
517 <listitem>
518 <para>Is used to modify the given user's login name, User
519 Identification (UID), shell, initial group, home directory, etc.</para>
520 <indexterm zone="ch-system-shadow usermod">
521 <primary sortas="b-usermod">usermod</primary>
522 </indexterm>
523 </listitem>
524 </varlistentry>
525
526 <varlistentry id="vigr">
527 <term><command>vigr</command></term>
528 <listitem>
529 <para>Edits the <filename>/etc/group</filename> or
530 <filename>/etc/gshadow</filename> files</para>
531 <indexterm zone="ch-system-shadow vigr">
532 <primary sortas="b-vigr">vigr</primary>
533 </indexterm>
534 </listitem>
535 </varlistentry>
536
537 <varlistentry id="vipw">
538 <term><command>vipw</command></term>
539 <listitem>
540 <para>Edits the <filename>/etc/passwd</filename> or
541 <filename>/etc/shadow</filename> files</para>
542 <indexterm zone="ch-system-shadow vipw">
543 <primary sortas="b-vipw">vipw</primary>
544 </indexterm>
545 </listitem>
546 </varlistentry>
547
548 <varlistentry id="libshadow">
549 <term><filename class="libraryfile">libshadow</filename></term>
550 <listitem>
551 <para>Contains functions used by most programs in this package</para>
552 <indexterm zone="ch-system-shadow libshadow">
553 <primary sortas="c-libshadow">libshadow</primary>
554 </indexterm>
555 </listitem>
556 </varlistentry>
557
558 </variablelist>
559
560 </sect2>
561
562</sect1>
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