1 User-Visible krb5-strength Changes
3 krb5-strength 3.0 (unreleased)
5 A password history implementation for Heimdal is now included. This
6 is a separate Perl program, heimdal-history, that stacks with the
7 external program implementation of strength checking. It is not
8 available in the form of a plugin, only as a Heimdal external password
9 quality check. (MIT Kerberos provides its own password history
10 mechanism.) This program has more extensive Perl module dependencies
11 than the other programs in this distribution.
13 A new configuration option, minimum_different, can be set to require
14 that passwords contain at least that many unique characters. This can
15 be used to reject long strings of identical characters or short
16 patterns, which may pass other checks but still be too easy to guess.
18 krb5-strength 2.2 (2013-12-16)
20 More complex character class requirements can be specified with the
21 configuration option require_classes. This option lists the character
22 classes the password must contain. These restrictions may be
23 qualified with password length ranges, allowing the requirements to
24 change with the length of the password. See README for more details
25 and the option syntax.
27 cdbmake-wordlist now supports filtering out words based on maximum
28 length (-L) and arbitrary user-provided regular expressions (-x). It
29 also supports running in filter mode to produce a new wordlist instead
32 Close a file descriptor and memory leak in the included version of
33 CrackLib. This problem was already fixed in CrackLib 2.9.0.
35 Update to rra-c-util 4.12:
37 * Properly check the return status of snprintf and friends.
39 Update to C TAP Harness 2.3:
41 * Suppress lazy plans and test summaries if the test failed with bail.
42 * Add warn_unused_result gcc attributes to relevant functions.
44 krb5-strength 2.1 (2013-10-10)
46 Fix the package build when CDB support is disabled or TinyCDB was not
49 Some of the password rejection error messages have been changed to
50 make them more accurate or comprehensible to the user.
52 Passing --with-tinycdb to configure now correctly makes TinyCDB
53 support mandatory without adding bogus directories to the library and
56 krb5-strength 2.0 (2013-10-07)
58 Add support for the MIT Kerberos password quality plugin interface,
59 available in MIT Kerberos 1.9 and later, contributed by Greg Hudson
60 and MIT. Drop the patch for MIT Kerberos 1.4 (and hence support for
61 versions of MIT Kerberos prior to 1.9). A dictionary path set in
62 krb5.conf takes precedence over the dictionary path provided by MIT
63 Kerberos when the plugin is initialized, if both are set, to allow the
64 dict_path configuration setting to be used for other plugins while
65 using a separate dictionary for krb5-strength.
67 The default installation path for this plugin is now
68 /usr/local/lib/krb5/plugins/pwqual/strength.so (for both MIT and
69 Heimdal), assuming a --libdir setting of /usr/local/lib. This may
70 require updates to the Kerberos KDC configuration or moving the plugin
71 when upgrading from earlier versions.
73 Add support for building with TinyCDB and then checking passwords
74 against a CDB database. There is a new password_dictionary_cdb
75 krb5.conf configuration setting that configures a CDB directory to
76 use. The tests with a CDB dictionary are much simpler: passwords are
77 rejected if found in the dictionary either literally, with one or two
78 characters removed from the start or end, or with one character
79 removed from both the start and the end. Both a CrackLib and a CDB
80 dictionary can be specified to check both dictionaries. A new
81 cdbmake-wordlist utility (written in Perl) is included to ease the
82 process of creating a CDB database from a simple word list.
84 A minimum password length can now be enforced directly via the plugin
85 or external check program without relying on CrackLib. To set a
86 minimum password length, add a minimum_length setting to the
87 krb5-strength section of [appdefaults] in krb5.conf.
89 New boolean settings require_ascii_printable and require_non_letter
90 are supported in the krb5-strength setting of [appdefaults] in
91 krb5.conf. The former rejects passwords containing characters other
92 than printable ASCII characters (including space), and the latter
93 requires that passwords contain at least one character that is not a
94 letter (upper or lower case) or a space.
96 The plugin can now be configured without a dictionary, in which case
97 only checks for a password based on the principal and the simpler
98 checks available through the new configuration variables are done.
99 This mode is mostly useful for testing, since such simple checking can
100 more easily be done via less complex password strength configurations.
102 The check for passwords based on the principal now check for passwords
103 formed by reversing or adding numbers before and after each separate
104 component of the principal. This will catch passwords based on the
105 realm or components of the realm, which will often catch passwords
106 based on the name of the local institution.
108 The plugin now sets the Kerberos error message in the context to pass
109 error information, resulting in higher-quality error reporting in the
112 CrackLib checks for passwords where a character is a simple increment
113 or decrement of the previous character. In previous versions, the
114 embedded version of CrackLib allowed at most four such occurrences in
115 the entire password. This results in false positives on long
116 passphrases, since such accidental letter relationships aren't
117 uncommon in human languages. Change the embedded CrackLib to allow
118 one such simple increment for every three characters in the password,
119 which tightens the check somewhat for shorter passwords and loosens it
120 considerably for longer passwords.
122 Expect the Heimdal password strength checking plugin header in
123 kadm5/kadm5-pwcheck.h instead of outside of the kadm5 directory. This
124 is the path used by current versions of Heimdal. Drop support for
125 older versions of Heimdal that don't install this header file.
127 Update to rra-c-util 4.9:
129 * Probe for Kerberos headers using file checks instead of compiles.
130 * Improve probe for the Heimdal libroken library.
131 * Always build with large file support.
132 * Conditionally call AM_PROG_AR for portability to new Autotools.
134 Update to C TAP Harness 2.2:
136 * Allow more easily running single programs under tests/runtests.
137 * Flush the output from the test harness after each test.
139 krb5-strength 1.1 (2012-05-11)
141 Change the minimum password length in the embedded CrackLib to 8.
143 Reject passwords formed from the username portion of the principal
144 with digits appended.
146 In the embedded CrackLib, also check for a duplicated dictionary word.
148 Support linking with the system CrackLib instead of the embedded and
149 stricter copy by passing --with-cracklib to configure.
151 Fix variable sizes in the embedded CrackLib on 64-bit platforms. This
152 may fix interoperability problems with databases created on platforms
153 with a different native integer size. Thanks, Karl Lehnberger and
156 Stop using local in the test suite for portability to Solaris /bin/sh.
158 Update to rra-c-util 4.4:
160 * Use PATH_KRB5_CONFIG to override krb5-config location.
161 * Fix probing for ibm_svc/krb5_svc.h on AIX.
162 * Support Heimdal libraries without libroken, like OpenBSD.
163 * Fix manual Kerberos library probing without transitive dependencies.
164 * Support systems that only have krb5/krb5.h.
165 * Pass --deps to krb5-config in the non-reduced-dependencies case.
166 * Silence __attribute__ warnings on more compilers.
167 * Update warning flags for make warnings.
168 * Flesh out MAINTCLEANFILES to remove autogen results.
169 * Add notices to all files copied from rra-c-util.
171 Update to C TAP Harness 1.12:
173 * Drop is_double from the C TAP library to avoid requiring -lm.
174 * Avoid using local in the shell libtap.sh library.
175 * Silence __attribute__ warnings on more compilers.
176 * runtests now frees all allocated resources on exit.
177 * Fix runtests to still honor SOURCE and -s without BUILD and -b.
178 * Add tests/HOWTO documenting how to add new tests.
179 * Ensure correct output ordering in test results.
180 * Add -h and a better usage message to tests/runtests.
182 krb5-strength 1.0 (2010-02-16)
184 Add heimdal-strength, a program that checks password strength using
185 the protocol for a Heimdal external check program.
187 The shared module now also exports the interface expected by Heimdal's
188 dynamically loaded password strength checking API and can be used as a
189 Heimdal kadmin plugin.
191 Add a new plugin API for MIT Kerberos modelled after the plugin API
192 used for other MIT Kerberos plugins. Thanks to Marcus Watts for
193 substantial research and contributions to the interface design. This
194 work is incomplete in this release, missing the corresponding patch to
197 Fixed the data format written by the included packer program to add
198 enough nul bytes at the end of the data. Previously, there was not
199 enough trailing nul bytes for the expected input format, leading to
200 uninitialized memory reads in the password lookup.
202 Add a test suite using the driver and library from C TAP Harness 1.1.
204 Add portability code for platforms without a working snprintf or other
205 deficiencies and updated the code to take advantage of those
208 krb5-strength 0.5 (2007-07-18)
210 The check of the password against the principal checked against the
211 fully-qualified principal, which is not the usual problem.
212 Additionally check that the password doesn't match the principal with
213 the realm removed or the reverse of that (case-insensitive).
215 krb5-strength 0.4 (2007-03-28)
217 The patches directory was omitted from the distribution. Really
220 krb5-strength 0.3 (2007-03-23)
222 Initial public release. Includes a patch for MIT Kerberos, a slightly
223 modified version of CrackLib, and glue wrapped around CrackLib to make