MTD 248-645A Bedienungsanleitung PDF herunterladen (Seite 199)

Linux From Scratch - Version 7.0

179

6.55. Shadow-4.1.4.3

The Shadow package contains programs for handling passwords in a secure way.

Approximate build time: 0.3 SBU

Required disk space: 30 MB

6.55.1. Installation of Shadow

Note

If you would like to enforce the use of strong passwords, refer to http://www.linuxfromscratch.org/blfs/view/

svn/postlfs/cracklib.html for installing CrackLib prior to building Shadow. Then add --with-libcrack

to the configure command below.

Disable the installation of the groups program and its man pages, as Coreutils provides a better version:

sed -i 's/groups$(EXEEXT) //' src/Makefile.in

find man -name Makefile.in -exec sed -i 's/groups\.1 / /' {} \;

Fix an issue with the installation of Russian man pages:

sed -i 's/man_MANS = $(man_nopam) /man_MANS = /' man/ru/Makefile.in

Instead of using the default crypt method, use the more secure SHA-512 method of password encryption, which also

allows passwords longer than 8 characters. It is also necessary to change the obsolete /var/spool/mail location

for user mailboxes that Shadow uses by default to the /var/mail location used currently:

sed -i -e 's@#ENCRYPT_METHOD DES@ENCRYPT_METHOD SHA512@' \

-e 's@/var/spool/mail@/var/mail@' etc/login.defs

Note

If you chose to build Shadow with Cracklib support, run the following:

sed -i 's@DICTPATH.*@DICTPATH\t/lib/cracklib/pw_dict@' \

etc/login.defs

Prepare Shadow for compilation:

./configure --sysconfdir=/etc

Compile the package:

make

This package does not come with a test suite.

Install the package:

make install

Move a misplaced program to its proper location:

mv -v /usr/bin/passwd /bin

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MTD 248-645A Bedienungsanleitung Seite 199