diff options
Diffstat (limited to 'modules/pam_cracklib')
| -rw-r--r-- | modules/pam_cracklib/Makefile.am | 33 | ||||
| -rw-r--r-- | modules/pam_cracklib/Makefile.in | 1148 | ||||
| -rw-r--r-- | modules/pam_cracklib/README | 254 | ||||
| -rw-r--r-- | modules/pam_cracklib/README.xml | 41 | ||||
| -rw-r--r-- | modules/pam_cracklib/pam_cracklib.8 | 363 | ||||
| -rw-r--r-- | modules/pam_cracklib/pam_cracklib.8.xml | 592 | ||||
| -rw-r--r-- | modules/pam_cracklib/pam_cracklib.c | 899 | ||||
| -rwxr-xr-x | modules/pam_cracklib/tst-pam_cracklib | 2 |
8 files changed, 3332 insertions, 0 deletions
diff --git a/modules/pam_cracklib/Makefile.am b/modules/pam_cracklib/Makefile.am new file mode 100644 index 0000000..e11c42d --- /dev/null +++ b/modules/pam_cracklib/Makefile.am @@ -0,0 +1,33 @@ +# +# Copyright (c) 2005, 2006, 2009 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ +MAINTAINERCLEANFILES = $(MANS) README + +EXTRA_DIST = $(XMLS) + +if HAVE_DOC +dist_man_MANS = pam_cracklib.8 +endif +XMLS = README.xml pam_cracklib.8.xml +dist_check_SCRIPTS = tst-pam_cracklib +TESTS = $(dist_check_SCRIPTS) + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \ + $(WARN_CFLAGS) +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif +pam_cracklib_la_LIBADD = $(top_builddir)/libpam/libpam.la \ + @LIBCRACK@ @LIBCRYPT@ +securelib_LTLIBRARIES = pam_cracklib.la + +if ENABLE_REGENERATE_MAN +dist_noinst_DATA = README +-include $(top_srcdir)/Make.xml.rules +endif diff --git a/modules/pam_cracklib/Makefile.in b/modules/pam_cracklib/Makefile.in new file mode 100644 index 0000000..9cd1afc --- /dev/null +++ b/modules/pam_cracklib/Makefile.in @@ -0,0 +1,1148 @@ +# Makefile.in generated by automake 1.16.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994-2018 Free Software Foundation, Inc. + +# This Makefile.in is free software; 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All being well, the +password is passed on to subsequent modules to be installed as the new +authentication token. + +The strength checks works in the following manner: at first the Cracklib +routine is called to check if the password is part of a dictionary; if this is +not the case an additional set of strength checks is done. These checks are: + +Palindrome + + Is the new password a palindrome? + +Case Change Only + + Is the new password the old one with only a change of case? + +Similar + + Is the new password too much like the old one? This is primarily controlled + by one argument, difok which is a number of character changes (inserts, + removals, or replacements) between the old and new password that are enough + to accept the new password. This defaults to 5 changes. + +Simple + + Is the new password too small? This is controlled by 6 arguments minlen, + maxclassrepeat, dcredit, ucredit, lcredit, and ocredit. See the section on + the arguments for the details of how these work and there defaults. + +Rotated + + Is the new password a rotated version of the old password? + +Same consecutive characters + + Optional check for same consecutive characters. + +Too long monotonic character sequence + + Optional check for too long monotonic character sequence. + +Contains user name + + Optional check whether the password contains the user's name in some form. + +This module with no arguments will work well for standard unix password +encryption. With md5 encryption, passwords can be longer than 8 characters and +the default settings for this module can make it hard for the user to choose a +satisfactory new password. Notably, the requirement that the new password +contain no more than 1/2 of the characters in the old password becomes a +non-trivial constraint. For example, an old password of the form "the quick +brown fox jumped over the lazy dogs" would be difficult to change... In +addition, the default action is to allow passwords as small as 5 characters in +length. For a md5 systems it can be a good idea to increase the required +minimum size of a password. One can then allow more credit for different kinds +of characters but accept that the new password may share most of these +characters with the old password. + +OPTIONS + +debug + + This option makes the module write information to syslog(3) indicating the + behavior of the module (this option does not write password information to + the log file). + +authtok_type=XXX + + The default action is for the module to use the following prompts when + requesting passwords: "New UNIX password: " and "Retype UNIX password: ". + The example word UNIX can be replaced with this option, by default it is + empty. + +retry=N + + Prompt user at most N times before returning with error. The default is 1. + +difok=N + + This argument will change the default of 5 for the number of character + changes in the new password that differentiate it from the old password. + +minlen=N + + The minimum acceptable size for the new password (plus one if credits are + not disabled which is the default). In addition to the number of characters + in the new password, credit (of +1 in length) is given for each different + kind of character (other, upper, lower and digit). The default for this + parameter is 9 which is good for a old style UNIX password all of the same + type of character but may be too low to exploit the added security of a md5 + system. Note that there is a pair of length limits in Cracklib itself, a + "way too short" limit of 4 which is hard coded in and a defined limit (6) + that will be checked without reference to minlen. If you want to allow + passwords as short as 5 characters you should not use this module. + +dcredit=N + + (N >= 0) This is the maximum credit for having digits in the new password. + If you have less than or N digits, each digit will count +1 towards meeting + the current minlen value. The default for dcredit is 1 which is the + recommended value for minlen less than 10. + + (N < 0) This is the minimum number of digits that must be met for a new + password. + +ucredit=N + + (N >= 0) This is the maximum credit for having upper case letters in the + new password. If you have less than or N upper case letters each letter + will count +1 towards meeting the current minlen value. The default for + ucredit is 1 which is the recommended value for minlen less than 10. + + (N < 0) This is the minimum number of upper case letters that must be met + for a new password. + +lcredit=N + + (N >= 0) This is the maximum credit for having lower case letters in the + new password. If you have less than or N lower case letters, each letter + will count +1 towards meeting the current minlen value. The default for + lcredit is 1 which is the recommended value for minlen less than 10. + + (N < 0) This is the minimum number of lower case letters that must be met + for a new password. + +ocredit=N + + (N >= 0) This is the maximum credit for having other characters in the new + password. If you have less than or N other characters, each character will + count +1 towards meeting the current minlen value. The default for ocredit + is 1 which is the recommended value for minlen less than 10. + + (N < 0) This is the minimum number of other characters that must be met for + a new password. + +minclass=N + + The minimum number of required classes of characters for the new password. + The default number is zero. The four classes are digits, upper and lower + letters and other characters. The difference to the credit check is that a + specific class if of characters is not required. Instead N out of four of + the classes are required. + +maxrepeat=N + + Reject passwords which contain more than N same consecutive characters. The + default is 0 which means that this check is disabled. + +maxsequence=N + + Reject passwords which contain monotonic character sequences longer than N. + The default is 0 which means that this check is disabled. Examples of such + sequence are '12345' or 'fedcb'. Note that most such passwords will not + pass the simplicity check unless the sequence is only a minor part of the + password. + +maxclassrepeat=N + + Reject passwords which contain more than N consecutive characters of the + same class. The default is 0 which means that this check is disabled. + +reject_username + + Check whether the name of the user in straight or reversed form is + contained in the new password. If it is found the new password is rejected. + +gecoscheck + + Check whether the words from the GECOS field (usually full name of the + user) longer than 3 characters in straight or reversed form are contained + in the new password. If any such word is found the new password is + rejected. + +enforce_for_root + + The module will return error on failed check also if the user changing the + password is root. This option is off by default which means that just the + message about the failed check is printed but root can change the password + anyway. Note that root is not asked for an old password so the checks that + compare the old and new password are not performed. + +use_authtok + + This argument is used to force the module to not prompt the user for a new + password but use the one provided by the previously stacked password + module. + +dictpath=/path/to/dict + + Path to the cracklib dictionaries. + +EXAMPLES + +For an example of the use of this module, we show how it may be stacked with +the password component of pam_unix(8) + +# +# These lines stack two password type modules. In this example the +# user is given 3 opportunities to enter a strong password. The +# "use_authtok" argument ensures that the pam_unix module does not +# prompt for a password, but instead uses the one provided by +# pam_cracklib. +# +passwd password required pam_cracklib.so retry=3 +passwd password required pam_unix.so use_authtok + + +Another example (in the /etc/pam.d/passwd format) is for the case that you want +to use md5 password encryption: + +#%PAM-1.0 +# +# These lines allow a md5 systems to support passwords of at least 14 +# bytes with extra credit of 2 for digits and 2 for others the new +# password must have at least three bytes that are not present in the +# old password +# +password required pam_cracklib.so \ + difok=3 minlen=15 dcredit= 2 ocredit=2 +password required pam_unix.so use_authtok nullok md5 + + +And here is another example in case you don't want to use credits: + +#%PAM-1.0 +# +# These lines require the user to select a password with a minimum +# length of 8 and with at least 1 digit number, 1 upper case letter, +# and 1 other character +# +password required pam_cracklib.so \ + dcredit=-1 ucredit=-1 ocredit=-1 lcredit=0 minlen=8 +password required pam_unix.so use_authtok nullok md5 + + +AUTHOR + +pam_cracklib was written by Cristian Gafton <gafton@redhat.com> + diff --git a/modules/pam_cracklib/README.xml b/modules/pam_cracklib/README.xml new file mode 100644 index 0000000..c4a7b54 --- /dev/null +++ b/modules/pam_cracklib/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_cracklib.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_cracklib.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_cracklib-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_cracklib.8.xml" xpointer='xpointer(//refsect1[@id = "pam_cracklib-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_cracklib.8.xml" xpointer='xpointer(//refsect1[@id = "pam_cracklib-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_cracklib.8.xml" xpointer='xpointer(//refsect1[@id = "pam_cracklib-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_cracklib.8.xml" xpointer='xpointer(//refsect1[@id = "pam_cracklib-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_cracklib/pam_cracklib.8 b/modules/pam_cracklib/pam_cracklib.8 new file mode 100644 index 0000000..b7a6053 --- /dev/null +++ b/modules/pam_cracklib/pam_cracklib.8 @@ -0,0 +1,363 @@ +'\" t +.\" Title: pam_cracklib +.\" Author: [see the "AUTHOR" section] +.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/> +.\" Date: 06/08/2020 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" Language: English +.\" +.TH "PAM_CRACKLIB" "8" "06/08/2020" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" ----------------------------------------------------------------- +.\" * Define some portability stuff +.\" ----------------------------------------------------------------- +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" http://bugs.debian.org/507673 +.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.ie \n(.g .ds Aq \(aq +.el .ds Aq ' +.\" ----------------------------------------------------------------- +.\" * set default formatting +.\" ----------------------------------------------------------------- +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.\" ----------------------------------------------------------------- +.\" * MAIN CONTENT STARTS HERE * +.\" ----------------------------------------------------------------- +.SH "NAME" +pam_cracklib \- PAM module to check the password against dictionary words +.SH "SYNOPSIS" +.HP \w'\fBpam_cracklib\&.so\fR\ 'u +\fBpam_cracklib\&.so\fR [\fI\&.\&.\&.\fR] +.SH "DESCRIPTION" +.PP +This module can be plugged into the +\fIpassword\fR +stack of a given application to provide some plug\-in strength\-checking for passwords\&. +.PP +The action of this module is to prompt the user for a password and check its strength against a system dictionary and a set of rules for identifying poor choices\&. +.PP +The first action is to prompt for a single password, check its strength and then, if it is considered strong, prompt for the password a second time (to verify that it was typed correctly on the first occasion)\&. All being well, the password is passed on to subsequent modules to be installed as the new authentication token\&. +.PP +The strength checks works in the following manner: at first the +\fBCracklib\fR +routine is called to check if the password is part of a dictionary; if this is not the case an additional set of strength checks is done\&. These checks are: +.PP +Palindrome +.RS 4 +Is the new password a palindrome? +.RE +.PP +Case Change Only +.RS 4 +Is the new password the old one with only a change of case? +.RE +.PP +Similar +.RS 4 +Is the new password too much like the old one? This is primarily controlled by one argument, +\fBdifok\fR +which is a number of character changes (inserts, removals, or replacements) between the old and new password that are enough to accept the new password\&. This defaults to 5 changes\&. +.RE +.PP +Simple +.RS 4 +Is the new password too small? This is controlled by 6 arguments +\fBminlen\fR, +\fBmaxclassrepeat\fR, +\fBdcredit\fR, +\fBucredit\fR, +\fBlcredit\fR, and +\fBocredit\fR\&. See the section on the arguments for the details of how these work and there defaults\&. +.RE +.PP +Rotated +.RS 4 +Is the new password a rotated version of the old password? +.RE +.PP +Same consecutive characters +.RS 4 +Optional check for same consecutive characters\&. +.RE +.PP +Too long monotonic character sequence +.RS 4 +Optional check for too long monotonic character sequence\&. +.RE +.PP +Contains user name +.RS 4 +Optional check whether the password contains the user\*(Aqs name in some form\&. +.RE +.PP +This module with no arguments will work well for standard unix password encryption\&. With md5 encryption, passwords can be longer than 8 characters and the default settings for this module can make it hard for the user to choose a satisfactory new password\&. Notably, the requirement that the new password contain no more than 1/2 of the characters in the old password becomes a non\-trivial constraint\&. For example, an old password of the form "the quick brown fox jumped over the lazy dogs" would be difficult to change\&.\&.\&. In addition, the default action is to allow passwords as small as 5 characters in length\&. For a md5 systems it can be a good idea to increase the required minimum size of a password\&. One can then allow more credit for different kinds of characters but accept that the new password may share most of these characters with the old password\&. +.SH "OPTIONS" +.PP +.PP +\fBdebug\fR +.RS 4 +This option makes the module write information to +\fBsyslog\fR(3) +indicating the behavior of the module (this option does not write password information to the log file)\&. +.RE +.PP +\fBauthtok_type=\fR\fB\fIXXX\fR\fR +.RS 4 +The default action is for the module to use the following prompts when requesting passwords: "New UNIX password: " and "Retype UNIX password: "\&. The example word +\fIUNIX\fR +can be replaced with this option, by default it is empty\&. +.RE +.PP +\fBretry=\fR\fB\fIN\fR\fR +.RS 4 +Prompt user at most +\fIN\fR +times before returning with error\&. The default is +\fI1\fR\&. +.RE +.PP +\fBdifok=\fR\fB\fIN\fR\fR +.RS 4 +This argument will change the default of +\fI5\fR +for the number of character changes in the new password that differentiate it from the old password\&. +.RE +.PP +\fBminlen=\fR\fB\fIN\fR\fR +.RS 4 +The minimum acceptable size for the new password (plus one if credits are not disabled which is the default)\&. In addition to the number of characters in the new password, credit (of +1 in length) is given for each different kind of character (\fIother\fR, +\fIupper\fR, +\fIlower\fR +and +\fIdigit\fR)\&. The default for this parameter is +\fI9\fR +which is good for a old style UNIX password all of the same type of character but may be too low to exploit the added security of a md5 system\&. Note that there is a pair of length limits in +\fICracklib\fR +itself, a "way too short" limit of 4 which is hard coded in and a defined limit (6) that will be checked without reference to +\fBminlen\fR\&. If you want to allow passwords as short as 5 characters you should not use this module\&. +.RE +.PP +\fBdcredit=\fR\fB\fIN\fR\fR +.RS 4 +(N >= 0) This is the maximum credit for having digits in the new password\&. If you have less than or +\fIN\fR +digits, each digit will count +1 towards meeting the current +\fBminlen\fR +value\&. The default for +\fBdcredit\fR +is 1 which is the recommended value for +\fBminlen\fR +less than 10\&. +.sp +(N < 0) This is the minimum number of digits that must be met for a new password\&. +.RE +.PP +\fBucredit=\fR\fB\fIN\fR\fR +.RS 4 +(N >= 0) This is the maximum credit for having upper case letters in the new password\&. If you have less than or +\fIN\fR +upper case letters each letter will count +1 towards meeting the current +\fBminlen\fR +value\&. The default for +\fBucredit\fR +is +\fI1\fR +which is the recommended value for +\fBminlen\fR +less than 10\&. +.sp +(N < 0) This is the minimum number of upper case letters that must be met for a new password\&. +.RE +.PP +\fBlcredit=\fR\fB\fIN\fR\fR +.RS 4 +(N >= 0) This is the maximum credit for having lower case letters in the new password\&. If you have less than or +\fIN\fR +lower case letters, each letter will count +1 towards meeting the current +\fBminlen\fR +value\&. The default for +\fBlcredit\fR +is 1 which is the recommended value for +\fBminlen\fR +less than 10\&. +.sp +(N < 0) This is the minimum number of lower case letters that must be met for a new password\&. +.RE +.PP +\fBocredit=\fR\fB\fIN\fR\fR +.RS 4 +(N >= 0) This is the maximum credit for having other characters in the new password\&. If you have less than or +\fIN\fR +other characters, each character will count +1 towards meeting the current +\fBminlen\fR +value\&. The default for +\fBocredit\fR +is 1 which is the recommended value for +\fBminlen\fR +less than 10\&. +.sp +(N < 0) This is the minimum number of other characters that must be met for a new password\&. +.RE +.PP +\fBminclass=\fR\fB\fIN\fR\fR +.RS 4 +The minimum number of required classes of characters for the new password\&. The default number is zero\&. The four classes are digits, upper and lower letters and other characters\&. The difference to the +\fBcredit\fR +check is that a specific class if of characters is not required\&. Instead +\fIN\fR +out of four of the classes are required\&. +.RE +.PP +\fBmaxrepeat=\fR\fB\fIN\fR\fR +.RS 4 +Reject passwords which contain more than N same consecutive characters\&. The default is 0 which means that this check is disabled\&. +.RE +.PP +\fBmaxsequence=\fR\fB\fIN\fR\fR +.RS 4 +Reject passwords which contain monotonic character sequences longer than N\&. The default is 0 which means that this check is disabled\&. Examples of such sequence are \*(Aq12345\*(Aq or \*(Aqfedcb\*(Aq\&. Note that most such passwords will not pass the simplicity check unless the sequence is only a minor part of the password\&. +.RE +.PP +\fBmaxclassrepeat=\fR\fB\fIN\fR\fR +.RS 4 +Reject passwords which contain more than N consecutive characters of the same class\&. The default is 0 which means that this check is disabled\&. +.RE +.PP +\fBreject_username\fR +.RS 4 +Check whether the name of the user in straight or reversed form is contained in the new password\&. If it is found the new password is rejected\&. +.RE +.PP +\fBgecoscheck\fR +.RS 4 +Check whether the words from the GECOS field (usually full name of the user) longer than 3 characters in straight or reversed form are contained in the new password\&. If any such word is found the new password is rejected\&. +.RE +.PP +\fBenforce_for_root\fR +.RS 4 +The module will return error on failed check also if the user changing the password is root\&. This option is off by default which means that just the message about the failed check is printed but root can change the password anyway\&. Note that root is not asked for an old password so the checks that compare the old and new password are not performed\&. +.RE +.PP +\fBuse_authtok\fR +.RS 4 +This argument is used to +\fIforce\fR +the module to not prompt the user for a new password but use the one provided by the previously stacked +\fIpassword\fR +module\&. +.RE +.PP +\fBdictpath=\fR\fB\fI/path/to/dict\fR\fR +.RS 4 +Path to the cracklib dictionaries\&. +.RE +.SH "MODULE TYPES PROVIDED" +.PP +Only the +\fBpassword\fR +module type is provided\&. +.SH "RETURN VALUES" +.PP +.PP +PAM_SUCCESS +.RS 4 +The new password passes all checks\&. +.RE +.PP +PAM_AUTHTOK_ERR +.RS 4 +No new password was entered, the username could not be determined or the new password fails the strength checks\&. +.RE +.PP +PAM_AUTHTOK_RECOVERY_ERR +.RS 4 +The old password was not supplied by a previous stacked module or got not requested from the user\&. The first error can happen if +\fBuse_authtok\fR +is specified\&. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +A internal error occurred\&. +.RE +.SH "EXAMPLES" +.PP +For an example of the use of this module, we show how it may be stacked with the password component of +\fBpam_unix\fR(8) +.sp +.if n \{\ +.RS 4 +.\} +.nf +# +# These lines stack two password type modules\&. In this example the +# user is given 3 opportunities to enter a strong password\&. The +# "use_authtok" argument ensures that the pam_unix module does not +# prompt for a password, but instead uses the one provided by +# pam_cracklib\&. +# +passwd password required pam_cracklib\&.so retry=3 +passwd password required pam_unix\&.so use_authtok + +.fi +.if n \{\ +.RE +.\} +.PP +Another example (in the +/etc/pam\&.d/passwd +format) is for the case that you want to use md5 password encryption: +.sp +.if n \{\ +.RS 4 +.\} +.nf +#%PAM\-1\&.0 +# +# These lines allow a md5 systems to support passwords of at least 14 +# bytes with extra credit of 2 for digits and 2 for others the new +# password must have at least three bytes that are not present in the +# old password +# +password required pam_cracklib\&.so \e + difok=3 minlen=15 dcredit= 2 ocredit=2 +password required pam_unix\&.so use_authtok nullok md5 + +.fi +.if n \{\ +.RE +.\} +.PP +And here is another example in case you don\*(Aqt want to use credits: +.sp +.if n \{\ +.RS 4 +.\} +.nf +#%PAM\-1\&.0 +# +# These lines require the user to select a password with a minimum +# length of 8 and with at least 1 digit number, 1 upper case letter, +# and 1 other character +# +password required pam_cracklib\&.so \e + dcredit=\-1 ucredit=\-1 ocredit=\-1 lcredit=0 minlen=8 +password required pam_unix\&.so use_authtok nullok md5 + +.fi +.if n \{\ +.RE +.\} +.sp +.SH "SEE ALSO" +.PP +\fBpam.conf\fR(5), +\fBpam.d\fR(5), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_cracklib was written by Cristian Gafton <gafton@redhat\&.com> diff --git a/modules/pam_cracklib/pam_cracklib.8.xml b/modules/pam_cracklib/pam_cracklib.8.xml new file mode 100644 index 0000000..75e44e2 --- /dev/null +++ b/modules/pam_cracklib/pam_cracklib.8.xml @@ -0,0 +1,592 @@ +<?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_cracklib"> + + <refmeta> + <refentrytitle>pam_cracklib</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_cracklib-name"> + <refname>pam_cracklib</refname> + <refpurpose>PAM module to check the password against dictionary words</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_cracklib-cmdsynopsis"> + <command>pam_cracklib.so</command> + <arg choice="opt"> + <replaceable>...</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_cracklib-description"> + + <title>DESCRIPTION</title> + + <para> + This module can be plugged into the <emphasis>password</emphasis> stack of + a given application to provide some plug-in strength-checking for passwords. + </para> + + <para> + The action of this module is to prompt the user for a password and + check its strength against a system dictionary and a set of rules for + identifying poor choices. + </para> + + <para> + The first action is to prompt for a single password, check its + strength and then, if it is considered strong, prompt for the password + a second time (to verify that it was typed correctly on the first + occasion). All being well, the password is passed on to subsequent + modules to be installed as the new authentication token. + </para> + + <para> + The strength checks works in the following manner: at first the + <function>Cracklib</function> routine is called to check if the password + is part of a dictionary; if this is not the case an additional set of + strength checks is done. These checks are: + </para> + + <variablelist> + <varlistentry> + <term>Palindrome</term> + <listitem> + <para> + Is the new password a palindrome? + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>Case Change Only</term> + <listitem> + <para> + Is the new password the old one with only a change of case? + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>Similar</term> + <listitem> + <para> + Is the new password too much like the old one? + This is primarily controlled by one argument, + <option>difok</option> which is a number of character changes + (inserts, removals, or replacements) between the old and new + password that are enough to accept the new password. + This defaults to 5 changes. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>Simple</term> + <listitem> + <para> + Is the new password too small? + This is controlled by 6 arguments <option>minlen</option>, + <option>maxclassrepeat</option>, + <option>dcredit</option>, <option>ucredit</option>, + <option>lcredit</option>, and <option>ocredit</option>. See the section + on the arguments for the details of how these work and there defaults. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>Rotated</term> + <listitem> + <para> + Is the new password a rotated version of the old password? + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>Same consecutive characters</term> + <listitem> + <para> + Optional check for same consecutive characters. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>Too long monotonic character sequence</term> + <listitem> + <para> + Optional check for too long monotonic character sequence. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>Contains user name</term> + <listitem> + <para> + Optional check whether the password contains the user's name + in some form. + </para> + </listitem> + </varlistentry> + </variablelist> + <para> + This module with no arguments will work well for standard unix + password encryption. With md5 encryption, passwords can be longer + than 8 characters and the default settings for this module can make it + hard for the user to choose a satisfactory new password. Notably, the + requirement that the new password contain no more than 1/2 of the + characters in the old password becomes a non-trivial constraint. For + example, an old password of the form "the quick brown fox jumped over + the lazy dogs" would be difficult to change... In addition, the + default action is to allow passwords as small as 5 characters in + length. For a md5 systems it can be a good idea to increase the + required minimum size of a password. One can then allow more credit + for different kinds of characters but accept that the new password may + share most of these characters with the old password. + </para> + + </refsect1> + + <refsect1 id="pam_cracklib-options"> + + <title>OPTIONS</title> + <para> + <variablelist> + + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + This option makes the module write information to + <citerefentry> + <refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum> + </citerefentry> + indicating the behavior of the module (this option does + not write password information to the log file). + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>authtok_type=<replaceable>XXX</replaceable></option> + </term> + <listitem> + <para> + The default action is for the module to use the + following prompts when requesting passwords: + "New UNIX password: " and "Retype UNIX password: ". + The example word <emphasis>UNIX</emphasis> can + be replaced with this option, by default it is empty. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>retry=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + Prompt user at most <replaceable>N</replaceable> times + before returning with error. The default is + <emphasis>1</emphasis>. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>difok=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + This argument will change the default of + <emphasis>5</emphasis> for the number of character + changes in the new password that differentiate it + from the old password. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>minlen=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + The minimum acceptable size for the new password (plus + one if credits are not disabled which is the default). + In addition to the number of characters in the new password, + credit (of +1 in length) is given for each different kind + of character (<emphasis>other</emphasis>, + <emphasis>upper</emphasis>, <emphasis>lower</emphasis> and + <emphasis>digit</emphasis>). The default for this parameter + is <emphasis>9</emphasis> which is good for a old style UNIX + password all of the same type of character but may be too low + to exploit the added security of a md5 system. Note that + there is a pair of length limits in + <emphasis>Cracklib</emphasis> itself, a "way too short" limit + of 4 which is hard coded in and a defined limit (6) that will + be checked without reference to <option>minlen</option>. + If you want to allow passwords as short as 5 characters you + should not use this module. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>dcredit=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + (N >= 0) This is the maximum credit for having digits in + the new password. If you have less than or + <replaceable>N</replaceable> + digits, each digit will count +1 towards meeting the current + <option>minlen</option> value. The default for + <option>dcredit</option> is 1 which is the recommended + value for <option>minlen</option> less than 10. + </para> + <para> + (N < 0) This is the minimum number of digits that must + be met for a new password. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>ucredit=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + (N >= 0) This is the maximum credit for having upper + case letters in the new password. If you have less than + or <replaceable>N</replaceable> upper case letters each + letter will count +1 towards meeting the current + <option>minlen</option> value. The default for + <option>ucredit</option> is <emphasis>1</emphasis> which + is the recommended value for <option>minlen</option> less + than 10. + </para> + <para> + (N < 0) This is the minimum number of upper + case letters that must be met for a new password. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>lcredit=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + (N >= 0) This is the maximum credit for having + lower case letters in the new password. If you have + less than or <replaceable>N</replaceable> lower case + letters, each letter will count +1 towards meeting the + current <option>minlen</option> value. The default for + <option>lcredit</option> is 1 which is the recommended + value for <option>minlen</option> less than 10. + </para> + <para> + (N < 0) This is the minimum number of lower + case letters that must be met for a new password. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>ocredit=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + (N >= 0) This is the maximum credit for having other + characters in the new password. If you have less than or + <replaceable>N</replaceable> other characters, each + character will count +1 towards meeting the current + <option>minlen</option> value. The default for + <option>ocredit</option> is 1 which is the recommended + value for <option>minlen</option> less than 10. + </para> + <para> + (N < 0) This is the minimum number of other + characters that must be met for a new password. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>minclass=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + The minimum number of required classes of characters for + the new password. The default number is zero. The four + classes are digits, upper and lower letters and other + characters. + The difference to the <option>credit</option> check is + that a specific class if of characters is not required. + Instead <replaceable>N</replaceable> out of four of the + classes are required. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>maxrepeat=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + Reject passwords which contain more than N same consecutive + characters. The default is 0 which means that this check + is disabled. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>maxsequence=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + Reject passwords which contain monotonic character sequences + longer than N. The default is 0 which means that this check + is disabled. Examples of such sequence are '12345' or 'fedcb'. + Note that most such passwords will not pass the simplicity + check unless the sequence is only a minor part of the password. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>maxclassrepeat=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + Reject passwords which contain more than N consecutive + characters of the same class. The default is 0 which means + that this check is disabled. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>reject_username</option> + </term> + <listitem> + <para> + Check whether the name of the user in straight or reversed + form is contained in the new password. If it is found the + new password is rejected. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>gecoscheck</option> + </term> + <listitem> + <para> + Check whether the words from the GECOS field (usually full name + of the user) longer than 3 characters in straight or reversed + form are contained in the new password. If any such word is + found the new password is rejected. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>enforce_for_root</option> + </term> + <listitem> + <para> + The module will return error on failed check also if the user + changing the password is root. This option is off by default + which means that just the message about the failed check is + printed but root can change the password anyway. + Note that root is not asked for an old password so the checks + that compare the old and new password are not performed. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>use_authtok</option> + </term> + <listitem> + <para> + This argument is used to <emphasis>force</emphasis> the + module to not prompt the user for a new password but use + the one provided by the previously stacked + <emphasis>password</emphasis> module. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>dictpath=<replaceable>/path/to/dict</replaceable></option> + </term> + <listitem> + <para> + Path to the cracklib dictionaries. + </para> + </listitem> + </varlistentry> + + </variablelist> + </para> + </refsect1> + + <refsect1 id="pam_cracklib-types"> + <title>MODULE TYPES PROVIDED</title> + <para> + Only the <option>password</option> module type is provided. + </para> + </refsect1> + + <refsect1 id='pam_cracklib-return_values'> + <title>RETURN VALUES</title> + <para> + <variablelist> + + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + The new password passes all checks. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_AUTHTOK_ERR</term> + <listitem> + <para> + No new password was entered, + the username could not be determined or the new + password fails the strength checks. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_AUTHTOK_RECOVERY_ERR</term> + <listitem> + <para> + The old password was not supplied by a previous stacked + module or got not requested from the user. + The first error can happen if <option>use_authtok</option> + is specified. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SERVICE_ERR</term> + <listitem> + <para> + A internal error occurred. + </para> + </listitem> + </varlistentry> + + </variablelist> + </para> + </refsect1> + + <refsect1 id='pam_cracklib-examples'> + <title>EXAMPLES</title> + <para> + For an example of the use of this module, we show how it may be + stacked with the password component of + <citerefentry> + <refentrytitle>pam_unix</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + <programlisting> +# +# These lines stack two password type modules. In this example the +# user is given 3 opportunities to enter a strong password. The +# "use_authtok" argument ensures that the pam_unix module does not +# prompt for a password, but instead uses the one provided by +# pam_cracklib. +# +passwd password required pam_cracklib.so retry=3 +passwd password required pam_unix.so use_authtok + </programlisting> + </para> + + <para> + Another example (in the <filename>/etc/pam.d/passwd</filename> format) + is for the case that you want to use md5 password encryption: + <programlisting> +#%PAM-1.0 +# +# These lines allow a md5 systems to support passwords of at least 14 +# bytes with extra credit of 2 for digits and 2 for others the new +# password must have at least three bytes that are not present in the +# old password +# +password required pam_cracklib.so \ + difok=3 minlen=15 dcredit= 2 ocredit=2 +password required pam_unix.so use_authtok nullok md5 + </programlisting> + </para> + + <para> + And here is another example in case you don't want to use credits: + <programlisting> +#%PAM-1.0 +# +# These lines require the user to select a password with a minimum +# length of 8 and with at least 1 digit number, 1 upper case letter, +# and 1 other character +# +password required pam_cracklib.so \ + dcredit=-1 ucredit=-1 ocredit=-1 lcredit=0 minlen=8 +password required pam_unix.so use_authtok nullok md5 + </programlisting> + </para> + + </refsect1> + + <refsect1 id='pam_cracklib-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_cracklib-author'> + <title>AUTHOR</title> + <para> + pam_cracklib was written by Cristian Gafton <gafton@redhat.com> + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_cracklib/pam_cracklib.c b/modules/pam_cracklib/pam_cracklib.c new file mode 100644 index 0000000..0129130 --- /dev/null +++ b/modules/pam_cracklib/pam_cracklib.c @@ -0,0 +1,899 @@ +/* + * pam_cracklib module + * + * 0.9. switch to using a distance algorithm in similar() + * 0.86. added support for setting minimum numbers of digits, uppers, + * lowers, and others + * 0.85. added six new options to use this with long passwords. + * 0.8. tidied output and improved D(()) usage for debugging. + * 0.7. added support for more obscure checks for new passwd. + * 0.6. root can reset user passwd to any values (it's only warned) + * 0.5. supports retries - 'retry=N' argument + * 0.4. added argument 'type=XXX' for 'New XXX password' prompt + * 0.3. Added argument 'debug' + * 0.2. new password is fed to cracklib for verify after typed once + * 0.1. First release + * + * Written by Cristian Gafton <gafton@redhat.com> 1996/09/10 + * Long password support by Philip W. Dalrymple <pwd@mdtsoft.com> 1997/07/18 + * See the end of the file for Copyright Information + * + * Modification for long password systems (>8 chars). The original + * module had problems when used in a md5 password system in that it + * allowed too short passwords but required that at least half of the + * bytes in the new password did not appear in the old one. this + * action is still the default and the changes should not break any + * current user. This modification adds 6 new options, one to set the + * number of bytes in the new password that are not in the old one, + * the other five to control the length checking, these are all + * documented (or will be before anyone else sees this code) in the PAM + * S.A.G. in the section on the cracklib module. + */ + +#include "config.h" + +#include <stdio.h> +#ifdef HAVE_LIBXCRYPT +# include <xcrypt.h> +#elif defined(HAVE_CRYPT_H) +# include <crypt.h> +#endif +#include <unistd.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <stdarg.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <ctype.h> +#include <limits.h> +#include <pwd.h> +#include <security/pam_modutil.h> + +#ifdef HAVE_CRACK_H +#include <crack.h> +#else +extern char *FascistCheck(char *pw, const char *dictpath); +#endif + +#ifndef CRACKLIB_DICTS +#define CRACKLIB_DICTS NULL +#endif + +#ifdef MIN +#undef MIN +#endif +#define MIN(_a, _b) (((_a) < (_b)) ? (_a) : (_b)) + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_ext.h> +#include "pam_inline.h" + +/* argument parsing */ +#define PAM_DEBUG_ARG 0x0001 + +struct cracklib_options { + int retry_times; + int diff_ok; + int min_length; + int dig_credit; + int up_credit; + int low_credit; + int oth_credit; + int min_class; + int max_repeat; + int max_sequence; + int max_class_repeat; + int reject_user; + int gecos_check; + int enforce_for_root; + const char *cracklib_dictpath; +}; + +#define CO_RETRY_TIMES 1 +#define CO_DIFF_OK 5 +#define CO_MIN_LENGTH 9 +# define CO_MIN_LENGTH_BASE 5 +#define CO_DIG_CREDIT 1 +#define CO_UP_CREDIT 1 +#define CO_LOW_CREDIT 1 +#define CO_OTH_CREDIT 1 +#define CO_MIN_WORD_LENGTH 4 + +static int +_pam_parse (pam_handle_t *pamh, struct cracklib_options *opt, + int argc, const char **argv) +{ + int ctrl=0; + + /* step through arguments */ + for (ctrl=0; argc-- > 0; ++argv) { + const char *str; + char *ep = NULL; + + /* generic options */ + + if (!strcmp(*argv,"debug")) + ctrl |= PAM_DEBUG_ARG; + else if ((str = pam_str_skip_prefix(*argv, "type=")) != NULL) + pam_set_item (pamh, PAM_AUTHTOK_TYPE, str); + else if ((str = pam_str_skip_prefix(*argv, "retry=")) != NULL) { + opt->retry_times = strtol(str, &ep, 10); + if (!ep || (opt->retry_times < 1)) + opt->retry_times = CO_RETRY_TIMES; + } else if ((str = pam_str_skip_prefix(*argv, "difok=")) != NULL) { + opt->diff_ok = strtol(str, &ep, 10); + if (!ep || (opt->diff_ok < 0)) + opt->diff_ok = CO_DIFF_OK; + } else if (pam_str_skip_prefix(*argv, "difignore=") != NULL) { + /* just ignore */ + } else if ((str = pam_str_skip_prefix(*argv, "minlen=")) != NULL) { + opt->min_length = strtol(str, &ep, 10); + if (!ep || (opt->min_length < CO_MIN_LENGTH_BASE)) + opt->min_length = CO_MIN_LENGTH_BASE; + } else if ((str = pam_str_skip_prefix(*argv, "dcredit=")) != NULL) { + opt->dig_credit = strtol(str, &ep, 10); + if (!ep) + opt->dig_credit = 0; + } else if ((str = pam_str_skip_prefix(*argv, "ucredit=")) != NULL) { + opt->up_credit = strtol(str, &ep, 10); + if (!ep) + opt->up_credit = 0; + } else if ((str = pam_str_skip_prefix(*argv, "lcredit=")) != NULL) { + opt->low_credit = strtol(str, &ep, 10); + if (!ep) + opt->low_credit = 0; + } else if ((str = pam_str_skip_prefix(*argv, "ocredit=")) != NULL) { + opt->oth_credit = strtol(str, &ep, 10); + if (!ep) + opt->oth_credit = 0; + } else if ((str = pam_str_skip_prefix(*argv, "minclass=")) != NULL) { + opt->min_class = strtol(str, &ep, 10); + if (!ep) + opt->min_class = 0; + if (opt->min_class > 4) + opt->min_class = 4; + } else if ((str = pam_str_skip_prefix(*argv, "maxrepeat=")) != NULL) { + opt->max_repeat = strtol(str, &ep, 10); + if (!ep) + opt->max_repeat = 0; + } else if ((str = pam_str_skip_prefix(*argv, "maxsequence=")) != NULL) { + opt->max_sequence = strtol(str, &ep, 10); + if (!ep) + opt->max_sequence = 0; + } else if ((str = pam_str_skip_prefix(*argv, "maxclassrepeat=")) != NULL) { + opt->max_class_repeat = strtol(str, &ep, 10); + if (!ep) + opt->max_class_repeat = 0; + } else if (!strcmp(*argv, "reject_username")) { + opt->reject_user = 1; + } else if (!strcmp(*argv, "gecoscheck")) { + opt->gecos_check = 1; + } else if (!strcmp(*argv, "enforce_for_root")) { + opt->enforce_for_root = 1; + } else if (pam_str_skip_prefix(*argv, "authtok_type=") != NULL) { + /* for pam_get_authtok, ignore */; + } else if (!strcmp(*argv, "use_authtok")) { + /* for pam_get_authtok, ignore */; + } else if (!strcmp(*argv, "use_first_pass")) { + /* for pam_get_authtok, ignore */; + } else if (!strcmp(*argv, "try_first_pass")) { + /* for pam_get_authtok, ignore */; + } else if ((str = pam_str_skip_prefix(*argv, "dictpath=")) != NULL) { + opt->cracklib_dictpath = str; + if (!*(opt->cracklib_dictpath)) { + opt->cracklib_dictpath = CRACKLIB_DICTS; + } + } else { + pam_syslog(pamh,LOG_ERR,"pam_parse: unknown option; %s",*argv); + } + } + + return ctrl; +} + +/* Helper functions */ + +/* + * can't be a palindrome - like `R A D A R' or `M A D A M' + */ +static int palindrome(const char *new) +{ + int i, j; + + i = strlen (new); + + for (j = 0;j < i;j++) + if (new[i - j - 1] != new[j]) + return 0; + + return 1; +} + +/* + * Calculate how different two strings are in terms of the number of + * character removals, additions, and changes needed to go from one to + * the other + */ + +static int distdifferent(const char *old, const char *new, + size_t i, size_t j) +{ + char c, d; + + if ((i == 0) || (strlen(old) < i)) { + c = 0; + } else { + c = old[i - 1]; + } + if ((j == 0) || (strlen(new) < j)) { + d = 0; + } else { + d = new[j - 1]; + } + return (c != d); +} + +static int distcalculate(int **distances, const char *old, const char *new, + size_t i, size_t j) +{ + int tmp = 0; + + if (distances[i][j] != -1) { + return distances[i][j]; + } + + tmp = distcalculate(distances, old, new, i - 1, j - 1); + tmp = MIN(tmp, distcalculate(distances, old, new, i, j - 1)); + tmp = MIN(tmp, distcalculate(distances, old, new, i - 1, j)); + tmp += distdifferent(old, new, i, j); + + distances[i][j] = tmp; + + return tmp; +} + +static int distance(const char *old, const char *new) +{ + int **distances = NULL; + size_t m, n, i, j, r; + + m = strlen(old); + n = strlen(new); + distances = malloc(sizeof(int*) * (m + 1)); + + for (i = 0; i <= m; i++) { + distances[i] = malloc(sizeof(int) * (n + 1)); + for(j = 0; j <= n; j++) { + distances[i][j] = -1; + } + } + for (i = 0; i <= m; i++) { + distances[i][0] = i; + } + for (j = 0; j <= n; j++) { + distances[0][j] = j; + } + distances[0][0] = 0; + + r = distcalculate(distances, old, new, m, n); + + for (i = 0; i <= m; i++) { + memset(distances[i], 0, sizeof(int) * (n + 1)); + free(distances[i]); + } + free(distances); + + return r; +} + +static int similar(struct cracklib_options *opt, + const char *old, const char *new) +{ + if (distance(old, new) >= opt->diff_ok) { + return 0; + } + + if (strlen(new) >= (strlen(old) * 2)) { + return 0; + } + + /* passwords are too similar */ + return 1; +} + +/* + * enough classes of characters + */ + +static int minclass (struct cracklib_options *opt, + const char *new) +{ + int digits = 0; + int uppers = 0; + int lowers = 0; + int others = 0; + int total_class; + int i; + int retval; + + D(( "called" )); + for (i = 0; new[i]; i++) + { + if (isdigit (new[i])) + digits = 1; + else if (isupper (new[i])) + uppers = 1; + else if (islower (new[i])) + lowers = 1; + else + others = 1; + } + + total_class = digits + uppers + lowers + others; + + D (("total class: %d\tmin_class: %d", total_class, opt->min_class)); + + if (total_class >= opt->min_class) + retval = 0; + else + retval = 1; + + return retval; +} + + +/* + * a nice mix of characters. + */ +static int simple(struct cracklib_options *opt, const char *new) +{ + int digits = 0; + int uppers = 0; + int lowers = 0; + int others = 0; + int size; + int i; + enum { NONE, DIGIT, UCASE, LCASE, OTHER } prevclass = NONE; + int sameclass = 0; + + for (i = 0;new[i];i++) { + if (isdigit (new[i])) { + digits++; + if (prevclass != DIGIT) { + prevclass = DIGIT; + sameclass = 1; + } else + sameclass++; + } + else if (isupper (new[i])) { + uppers++; + if (prevclass != UCASE) { + prevclass = UCASE; + sameclass = 1; + } else + sameclass++; + } + else if (islower (new[i])) { + lowers++; + if (prevclass != LCASE) { + prevclass = LCASE; + sameclass = 1; + } else + sameclass++; + } + else { + others++; + if (prevclass != OTHER) { + prevclass = OTHER; + sameclass = 1; + } else + sameclass++; + } + if (opt->max_class_repeat > 0 && sameclass > opt->max_class_repeat) { + return 1; + } + } + + /* + * The scam was this - a password of only one character type + * must be 8 letters long. Two types, 7, and so on. + * This is now changed, the base size and the credits or defaults + * see the docs on the module for info on these parameters, the + * defaults cause the effect to be the same as before the change + */ + + if ((opt->dig_credit >= 0) && (digits > opt->dig_credit)) + digits = opt->dig_credit; + + if ((opt->up_credit >= 0) && (uppers > opt->up_credit)) + uppers = opt->up_credit; + + if ((opt->low_credit >= 0) && (lowers > opt->low_credit)) + lowers = opt->low_credit; + + if ((opt->oth_credit >= 0) && (others > opt->oth_credit)) + others = opt->oth_credit; + + size = opt->min_length; + + if (opt->dig_credit >= 0) + size -= digits; + else if (digits < opt->dig_credit * -1) + return 1; + + if (opt->up_credit >= 0) + size -= uppers; + else if (uppers < opt->up_credit * -1) + return 1; + + if (opt->low_credit >= 0) + size -= lowers; + else if (lowers < opt->low_credit * -1) + return 1; + + if (opt->oth_credit >= 0) + size -= others; + else if (others < opt->oth_credit * -1) + return 1; + + if (size <= i) + return 0; + + return 1; +} + +static int consecutive(struct cracklib_options *opt, const char *new) +{ + char c; + int i; + int same; + + if (opt->max_repeat == 0) + return 0; + + for (i = 0; new[i]; i++) { + if (i > 0 && new[i] == c) { + ++same; + if (same > opt->max_repeat) + return 1; + } else { + c = new[i]; + same = 1; + } + } + return 0; +} + +static int sequence(struct cracklib_options *opt, const char *new) +{ + char c; + int i; + int sequp = 1; + int seqdown = 1; + + if (opt->max_sequence == 0) + return 0; + + if (new[0] == '\0') + return 0; + + for (i = 1; new[i]; i++) { + c = new[i-1]; + if (new[i] == c+1) { + ++sequp; + if (sequp > opt->max_sequence) + return 1; + seqdown = 1; + } else if (new[i] == c-1) { + ++seqdown; + if (seqdown > opt->max_sequence) + return 1; + sequp = 1; + } else { + sequp = 1; + seqdown = 1; + } + } + return 0; +} + +static int wordcheck(const char *new, char *word) +{ + char *f, *b; + + if (strstr(new, word) != NULL) + return 1; + + /* now reverse the word, we can do that in place + as it is strdup-ed */ + f = word; + b = word+strlen(word)-1; + while (f < b) { + char c; + + c = *f; + *f = *b; + *b = c; + --b; + ++f; + } + + if (strstr(new, word) != NULL) + return 1; + return 0; +} + +static int usercheck(struct cracklib_options *opt, const char *new, + char *user) +{ + if (!opt->reject_user) + return 0; + + return wordcheck(new, user); +} + +static char * str_lower(char *string) +{ + char *cp; + + if (!string) + return NULL; + + for (cp = string; *cp; cp++) + *cp = tolower(*cp); + return string; +} + +static int gecoscheck(pam_handle_t *pamh, struct cracklib_options *opt, const char *new, + const char *user) +{ + struct passwd *pwd; + char *list; + char *p; + char *next; + + if (!opt->gecos_check) + return 0; + + if ((pwd = pam_modutil_getpwnam(pamh, user)) == NULL) { + return 0; + } + + list = strdup(pwd->pw_gecos); + + if (list == NULL || *list == '\0') { + free(list); + return 0; + } + + for (p = list;;p = next + 1) { + next = strchr(p, ' '); + if (next) + *next = '\0'; + + if (strlen(p) >= CO_MIN_WORD_LENGTH) { + str_lower(p); + if (wordcheck(new, p)) { + free(list); + return 1; + } + } + + if (!next) + break; + } + + free(list); + return 0; +} + +static const char *password_check(pam_handle_t *pamh, struct cracklib_options *opt, + const char *old, const char *new, + const char *user) +{ + const char *msg = NULL; + char *oldmono = NULL, *newmono, *wrapped = NULL; + char *usermono = NULL; + + if (old && strcmp(new, old) == 0) { + msg = _("is the same as the old one"); + return msg; + } + + newmono = str_lower(strdup(new)); + if (!newmono) + msg = _("memory allocation error"); + + usermono = str_lower(strdup(user)); + if (!usermono) + msg = _("memory allocation error"); + + if (!msg && old) { + oldmono = str_lower(strdup(old)); + if (oldmono) + wrapped = malloc(strlen(oldmono) * 2 + 1); + if (wrapped) { + strcpy (wrapped, oldmono); + strcat (wrapped, oldmono); + } else { + msg = _("memory allocation error"); + } + } + + if (!msg && palindrome(newmono)) + msg = _("is a palindrome"); + + if (!msg && oldmono && strcmp(oldmono, newmono) == 0) + msg = _("case changes only"); + + if (!msg && oldmono && similar(opt, oldmono, newmono)) + msg = _("is too similar to the old one"); + + if (!msg && simple(opt, new)) + msg = _("is too simple"); + + if (!msg && wrapped && strstr(wrapped, newmono)) + msg = _("is rotated"); + + if (!msg && minclass (opt, new)) + msg = _("not enough character classes"); + + if (!msg && consecutive(opt, new)) + msg = _("contains too many same characters consecutively"); + + if (!msg && sequence(opt, new)) + msg = _("contains too long of a monotonic character sequence"); + + if (!msg && (usercheck(opt, newmono, usermono) || gecoscheck(pamh, opt, newmono, user))) + msg = _("contains the user name in some form"); + + free(usermono); + if (newmono) { + memset(newmono, 0, strlen(newmono)); + free(newmono); + } + if (oldmono) { + memset(oldmono, 0, strlen(oldmono)); + free(oldmono); + } + if (wrapped) { + memset(wrapped, 0, strlen(wrapped)); + free(wrapped); + } + + return msg; +} + + +static int _pam_unix_approve_pass(pam_handle_t *pamh, + unsigned int ctrl, + struct cracklib_options *opt, + const char *pass_old, + const char *pass_new) +{ + const char *msg = NULL; + const char *user; + int retval; + + if (pass_new == NULL || (pass_old && !strcmp(pass_old,pass_new))) { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_DEBUG, "bad authentication token"); + pam_error(pamh, "%s", pass_new == NULL ? + _("No password has been supplied.") : + _("The password has not been changed.")); + return PAM_AUTHTOK_ERR; + } + + retval = pam_get_user(pamh, &user, NULL); + if (retval != PAM_SUCCESS) { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_NOTICE, "cannot determine user name: %s", + pam_strerror(pamh, retval)); + return PAM_AUTHTOK_ERR; + } + /* + * if one wanted to hardwire authentication token strength + * checking this would be the place + */ + msg = password_check(pamh, opt, pass_old, pass_new, user); + + if (msg) { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_NOTICE, + "new passwd fails strength check: %s", msg); + pam_error(pamh, _("BAD PASSWORD: %s"), msg); + return PAM_AUTHTOK_ERR; + }; + return PAM_SUCCESS; + +} + +/* The Main Thing (by Cristian Gafton, CEO at this module :-) + * (stolen from http://home.netscape.com) + */ +int +pam_sm_chauthtok(pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + unsigned int ctrl; + struct cracklib_options options; + + D(("called.")); + + memset(&options, 0, sizeof(options)); + options.retry_times = CO_RETRY_TIMES; + options.diff_ok = CO_DIFF_OK; + options.min_length = CO_MIN_LENGTH; + options.dig_credit = CO_DIG_CREDIT; + options.up_credit = CO_UP_CREDIT; + options.low_credit = CO_LOW_CREDIT; + options.oth_credit = CO_OTH_CREDIT; + options.cracklib_dictpath = CRACKLIB_DICTS; + + ctrl = _pam_parse(pamh, &options, argc, argv); + + if (flags & PAM_PRELIM_CHECK) { + /* Check for passwd dictionary */ + /* We cannot do that, since the original path is compiled + into the cracklib library and we don't know it. */ + return PAM_SUCCESS; + } else if (flags & PAM_UPDATE_AUTHTOK) { + int retval; + const void *oldtoken; + int tries; + + D(("do update")); + + + retval = pam_get_item (pamh, PAM_OLDAUTHTOK, &oldtoken); + if (retval != PAM_SUCCESS) { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh,LOG_ERR,"Can not get old passwd"); + oldtoken = NULL; + } + + tries = 0; + while (tries < options.retry_times) { + const char *crack_msg; + const char *newtoken = NULL; + + + tries++; + + /* Planned modus operandi: + * Get a passwd. + * Verify it against cracklib. + * If okay get it a second time. + * Check to be the same with the first one. + * set PAM_AUTHTOK and return + */ + + retval = pam_get_authtok_noverify (pamh, &newtoken, NULL); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, "pam_get_authtok_noverify returned error: %s", + pam_strerror (pamh, retval)); + continue; + } else if (newtoken == NULL) { /* user aborted password change, quit */ + return PAM_AUTHTOK_ERR; + } + + D(("testing password")); + /* now test this passwd against cracklib */ + + D(("against cracklib")); + if ((crack_msg = FascistCheck (newtoken, options.cracklib_dictpath))) { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh,LOG_DEBUG,"bad password: %s",crack_msg); + pam_error (pamh, _("BAD PASSWORD: %s"), crack_msg); + if (getuid() || options.enforce_for_root || (flags & PAM_CHANGE_EXPIRED_AUTHTOK)) + { + pam_set_item (pamh, PAM_AUTHTOK, NULL); + retval = PAM_AUTHTOK_ERR; + continue; + } + } + + /* check it for strength too... */ + D(("for strength")); + retval = _pam_unix_approve_pass (pamh, ctrl, &options, + oldtoken, newtoken); + if (retval != PAM_SUCCESS) { + if (getuid() || options.enforce_for_root || (flags & PAM_CHANGE_EXPIRED_AUTHTOK)) + { + pam_set_item(pamh, PAM_AUTHTOK, NULL); + retval = PAM_AUTHTOK_ERR; + continue; + } + } + + retval = pam_get_authtok_verify (pamh, &newtoken, NULL); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, "pam_get_authtok_verify returned error: %s", + pam_strerror (pamh, retval)); + pam_set_item(pamh, PAM_AUTHTOK, NULL); + continue; + } else if (newtoken == NULL) { /* user aborted password change, quit */ + return PAM_AUTHTOK_ERR; + } + + return PAM_SUCCESS; + } + + D(("returning because maxtries reached")); + + pam_set_item (pamh, PAM_AUTHTOK, NULL); + + /* if we have only one try, we can use the real reason, + else say that there were too many tries. */ + if (options.retry_times > 1) + return PAM_MAXTRIES; + else + return retval; + + } else { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_NOTICE, "UNKNOWN flags setting %02X",flags); + return PAM_SERVICE_ERR; + } + + /* Not reached */ + return PAM_SERVICE_ERR; +} + + + +/* + * Copyright (c) Cristian Gafton <gafton@redhat.com>, 1996. + * All rights reserved + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * + * The following copyright was appended for the long password support + * added with the libpam 0.58 release: + * + * Modificaton Copyright (c) Philip W. Dalrymple III <pwd@mdtsoft.com> + * 1997. All rights reserved + * + * THE MODIFICATION THAT PROVIDES SUPPORT FOR LONG PASSWORD TYPE CHECKING TO + * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ diff --git a/modules/pam_cracklib/tst-pam_cracklib b/modules/pam_cracklib/tst-pam_cracklib new file mode 100755 index 0000000..46a7060 --- /dev/null +++ b/modules/pam_cracklib/tst-pam_cracklib @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_cracklib.so |