Difference between revisions of "Cracklib"

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(I added a note about rebuilding Shadow.)
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{| style="text-align: left; background-color: AliceBlue;"
 
{| style="text-align: left; background-color: AliceBlue;"
−
|-
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|-valign="top"
 
!Download Source:
 
!Download Source:
−
|-
+
|-valign="top"
 
| http://prdownloads.sourceforge.net/cracklib/cracklib-{{Cracklib-Version}}.tar.gz
 
| http://prdownloads.sourceforge.net/cracklib/cracklib-{{Cracklib-Version}}.tar.gz
−
|-
+
|-valign="top"
 
| http://prdownloads.sourceforge.net/cracklib/cracklib-words.gz (Recommended word list for English-speaking countries)
 
| http://prdownloads.sourceforge.net/cracklib/cracklib-words.gz (Recommended word list for English-speaking countries)
−
|-
+
|-valign="top"
 
!Download Optional Patch:
 
!Download Optional Patch:
−
|-
 
 
| http://www.linuxfromscratch.org/patches/blfs/svn/cracklib-{{Cracklib-Version}}-heimdal-1.patch (Required patch to create a library used with the Heimdal Kerberos 5 package)
 
| http://www.linuxfromscratch.org/patches/blfs/svn/cracklib-{{Cracklib-Version}}-heimdal-1.patch (Required patch to create a library used with the Heimdal Kerberos 5 package)
 
|}
 
|}
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The CrackLib package contains a library used to enforce strong passwords by comparing user selected passwords to words in chosen word lists.
 
The CrackLib package contains a library used to enforce strong passwords by comparing user selected passwords to words in chosen word lists.
 +
 +
'''<font color=red>Important Note:</font>'''
 +
After installing Cracklib, you will need to reinstall [[Shadow]]
 +
if you want to have strong password support on your system.
 +
However, since [[Linux-PAM]] also requires you to rebuild
 +
[[Shadow]], you might as well wait until after you've built
 +
[[Linux-PAM]] if you intend to install that package on your
 +
system as well.
  
 
== Dependencies ==
 
== Dependencies ==
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{| style="text-align: left;"
 
{| style="text-align: left;"
 
|-
 
|-
−
! '''Installed Programs:'''
+
! Installed Programs:
 
| cracklib-check, cracklib-format, cracklib-packer, cracklib-unpacker, create-cracklib-dict
 
| cracklib-check, cracklib-format, cracklib-packer, cracklib-unpacker, create-cracklib-dict
 
|-
 
|-
−
! '''Installed Libraries:'''
+
! Installed Libraries:
 
| libcrack.{so,a}, libcrack_heimdal.{so,a}, cracklibmodule.{so,a} Python Modules
 
| libcrack.{so,a}, libcrack_heimdal.{so,a}, cracklibmodule.{so,a} Python Modules
 
|-
 
|-
−
! '''Installed Directories:'''
+
! Installed Directories:
 
|/lib/cracklib, /usr/share/dict, /usr/share/cracklib
 
|/lib/cracklib, /usr/share/dict, /usr/share/cracklib
 
|}
 
|}
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{| style="text-align: left;"
 
{| style="text-align: left;"
 
|-
 
|-
−
! '''create-cracklib-dict'''
+
! create-cracklib-dict
 
| is used to create the CrackLib dictionary from the given word list(s).  
 
| is used to create the CrackLib dictionary from the given word list(s).  
 
|-
 
|-
−
! '''libcrack.{so,a}'''
+
! libcrack.{so,a}
 
| provides a fast dictionary lookup method for strong password enforcement.
 
| provides a fast dictionary lookup method for strong password enforcement.
 
|}
 
|}
  
 
[[Category:Security]]
 
[[Category:Security]]

Revision as of 23:51, 5 January 2007

Download Source:
http://prdownloads.sourceforge.net/cracklib/cracklib-2.8.22.tar.gz
http://prdownloads.sourceforge.net/cracklib/cracklib-words.gz (Recommended word list for English-speaking countries)
Download Optional Patch: http://www.linuxfromscratch.org/patches/blfs/svn/cracklib-2.8.22-heimdal-1.patch (Required patch to create a library used with the Heimdal Kerberos 5 package)

Introduction to CrackLib

The CrackLib package contains a library used to enforce strong passwords by comparing user selected passwords to words in chosen word lists. 

Important Note:
After installing Cracklib, you will need to reinstall Shadow
if you want to have strong password support on your system.
However, since Linux-PAM also requires you to rebuild
Shadow, you might as well wait until after you've built
Linux-PAM if you intend to install that package on your
system as well.

Dependencies

Optional

Non-Multilib

If desired, apply the Heimdal patch (note that with this patch the original library is not affected; this patch only creates an additional library used by the Heimdal password-checking routines): 

patch -Np1 -i ../cracklib-2.8.22-heimdal-1.patch

Configure and compile the package: 

./configure --prefix=/usr -with-default-dict=/lib/cracklib/pw_dict &&
make

Install the package: 

make install &&
LIBNAME=$(cat lib/libcrack.la | grep library_names | cut -f2 -d"'" | cut  -f2 -d" ") &&
mv /usr/lib/$LIBNAME /lib &&
LIBNAME=$(cat lib/libcrack.la | grep library_names | cut -f2 -d"'" | cut -f1 -d" ") &&
mv /usr/lib/$LIBNAME /lib &&
ln -sf ../../lib/$LIBNAME /usr/lib/libcrack.so

Install the dictionary: 

install -m644 -D ../cracklib-words.gz /usr/share/dict/cracklib-words.gz
gunzip -f /usr/share/dict/cracklib-words.gz
ln -sf cracklib-words /usr/share/dict/words
echo $(hostname) >>/usr/share/dict/cracklib-extra-words &&
install -m755 -d /lib/cracklib
create-cracklib-dict /usr/share/dict/cracklib-words /usr/share/dict/cracklib-extra-words

Multilib

If desired, apply the Heimdal patch (note that with this patch the original library is not affected; this patch only creates an additional library used by the Heimdal password-checking routines): 

patch -Np1 -i ../cracklib-2.8.22-heimdal-1.patch

32Bit

Configure and compile the package: 

CC="gcc ${BUILD32}" USE_ARCH=32 ./configure --prefix=/usr -with-default-dict=/lib/cracklib/pw_dict &&
make

Install the package: 

make install &&
LIBNAME=$(cat lib/libcrack.la | grep library_names | cut -f2 -d"'" | cut -f2 -d" ") &&
mv /usr/lib/$LIBNAME /lib &&
LIBNAME=$(cat lib/libcrack.la | grep library_names | cut -f2 -d"'" | cut -f1 -d" ") &&
mv /usr/lib/$LIBNAME /lib &&
ln -sf ../../lib/$LIBNAME /usr/lib/libcrack.so

N32

Configure and compile the package: 

CC="gcc ${BUILDN32}" USE_ARCH=n32 ./configure --prefix=/usr \
  --libdir=/usr/lib32 -with-default-dict=/lib/cracklib/pw_dict &&
make

Install the package: 

make install &&
LIBNAME=$(cat lib/libcrack.la | grep library_names | cut -f2 -d"'" | cut -f2 -d" ") &&
mv /usr/lib/$LIBNAME /lib32 &&
LIBNAME=$(cat lib/libcrack.la | grep library_names | cut -f2 -d"'" | cut -f1 -d" ") &&
mv /usr/lib/$LIBNAME /lib32 &&
ln -sf ../../lib/$LIBNAME /usr/lib32/libcrack.so

64Bit

Configure and compile the package: 

CC="gcc ${BUILDN64}" USE_ARCH=64 ./configure --prefix=/usr \
  --libdir=/usr/lib64 -with-default-dict=/lib/cracklib/pw_dict &&
make

Install the package: 

make install &&
LIBNAME=$(cat lib/libcrack.la | grep library_names | cut -f2 -d"'" | cut -f2 -d" ") &&
mv /usr/lib/$LIBNAME /lib64 &&
LIBNAME=$(cat lib/libcrack.la | grep library_names | cut -f2 -d"'" | cut -f1 -d" ") &&
mv /usr/lib/$LIBNAME /lib64 &&
ln -sf ../../lib/$LIBNAME /usr/lib64/libcrack.so

Install the dictionary: 

install -m644 -D ../cracklib-words.gz /usr/share/dict/cracklib-words.gz
gunzip -f /usr/share/dict/cracklib-words.gz
ln -sf cracklib-words /usr/share/dict/words
install -m755 -d /lib/cracklib
create-cracklib-dict /usr/share/dict/cracklib-words /usr/share/dict/cracklib-extra-words

Contents

Installed Programs: cracklib-check, cracklib-format, cracklib-packer, cracklib-unpacker, create-cracklib-dict
Installed Libraries: libcrack.{so,a}, libcrack_heimdal.{so,a}, cracklibmodule.{so,a} Python Modules
Installed Directories: /lib/cracklib, /usr/share/dict, /usr/share/cracklib

Short Descriptions

create-cracklib-dict is used to create the CrackLib dictionary from the given word list(s).
libcrack.{so,a} provides a fast dictionary lookup method for strong password enforcement.
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