1 User-Visible krb5-strength Changes
3 krb5-strength 3.0 (2014-03-25)
5 The krb5-strength plugin and heimdal-strength program now support a
6 SQLite password dictionary. This format of dictionary can detect any
7 password within edit distance one of a dictionary word, meaning that
8 the dictionary word can be formed by adding, removing, or changing a
9 single character in the password. A SQLite password dictionary can be
10 used alone or in combination with any of the other supported
11 dictionary types. SQLite dictionary support is based on work by David
14 cdbmake-wordlist has been renamed to krb5-strength-wordlist.
15 Generating CDB dictionaries now requires the -c option; see the
16 documentation for more information. A SQLite database of dictionary
17 words can now be created instead, using the -s option.
19 A password history implementation for Heimdal is now included. This
20 is a separate Perl program, heimdal-history, that stacks with the
21 external program implementation of strength checking. It is not
22 available in the form of a plugin, only as a Heimdal external password
23 quality check. (MIT Kerberos provides its own password history
24 mechanism.) This program has more extensive Perl module dependencies
25 than the other programs in this distribution.
27 A new configuration option, minimum_different, can be set to require
28 that passwords contain at least that many unique characters. This can
29 be used to reject long strings of identical characters or short
30 patterns, which may pass other checks but still be too easy to guess.
32 Update to rra-c-util 5.4:
34 * Fix portable/krb5.h build with a C++ compiler.
35 * Use Lancaster Consensus environment variables to control tests.
36 * Work around perltidy bug that leaves behind stray log files.
38 Update to C TAP Harness 3.0:
40 * Reopen standard input to /dev/null when running a test list.
41 * Don't leak extraneous file descriptors to tests.
43 krb5-strength 2.2 (2013-12-16)
45 More complex character class requirements can be specified with the
46 configuration option require_classes. This option lists the character
47 classes the password must contain. These restrictions may be
48 qualified with password length ranges, allowing the requirements to
49 change with the length of the password. See README for more details
50 and the option syntax.
52 cdbmake-wordlist now supports filtering out words based on maximum
53 length (-L) and arbitrary user-provided regular expressions (-x). It
54 also supports running in filter mode to produce a new wordlist instead
57 Close a file descriptor and memory leak in the included version of
58 CrackLib. This problem was already fixed in CrackLib 2.9.0.
60 Update to rra-c-util 4.12:
62 * Properly check the return status of snprintf and friends.
64 Update to C TAP Harness 2.3:
66 * Suppress lazy plans and test summaries if the test failed with bail.
67 * Add warn_unused_result gcc attributes to relevant functions.
69 krb5-strength 2.1 (2013-10-10)
71 Fix the package build when CDB support is disabled or TinyCDB was not
74 Some of the password rejection error messages have been changed to
75 make them more accurate or comprehensible to the user.
77 Passing --with-tinycdb to configure now correctly makes TinyCDB
78 support mandatory without adding bogus directories to the library and
81 krb5-strength 2.0 (2013-10-07)
83 Add support for the MIT Kerberos password quality plugin interface,
84 available in MIT Kerberos 1.9 and later, contributed by Greg Hudson
85 and MIT. Drop the patch for MIT Kerberos 1.4 (and hence support for
86 versions of MIT Kerberos prior to 1.9). A dictionary path set in
87 krb5.conf takes precedence over the dictionary path provided by MIT
88 Kerberos when the plugin is initialized, if both are set, to allow the
89 dict_path configuration setting to be used for other plugins while
90 using a separate dictionary for krb5-strength.
92 The default installation path for this plugin is now
93 /usr/local/lib/krb5/plugins/pwqual/strength.so (for both MIT and
94 Heimdal), assuming a --libdir setting of /usr/local/lib. This may
95 require updates to the Kerberos KDC configuration or moving the plugin
96 when upgrading from earlier versions.
98 Add support for building with TinyCDB and then checking passwords
99 against a CDB database. There is a new password_dictionary_cdb
100 krb5.conf configuration setting that configures a CDB directory to
101 use. The tests with a CDB dictionary are much simpler: passwords are
102 rejected if found in the dictionary either literally, with one or two
103 characters removed from the start or end, or with one character
104 removed from both the start and the end. Both a CrackLib and a CDB
105 dictionary can be specified to check both dictionaries. A new
106 cdbmake-wordlist utility (written in Perl) is included to ease the
107 process of creating a CDB database from a simple word list.
109 A minimum password length can now be enforced directly via the plugin
110 or external check program without relying on CrackLib. To set a
111 minimum password length, add a minimum_length setting to the
112 krb5-strength section of [appdefaults] in krb5.conf.
114 New boolean settings require_ascii_printable and require_non_letter
115 are supported in the krb5-strength setting of [appdefaults] in
116 krb5.conf. The former rejects passwords containing characters other
117 than printable ASCII characters (including space), and the latter
118 requires that passwords contain at least one character that is not a
119 letter (upper or lower case) or a space.
121 The plugin can now be configured without a dictionary, in which case
122 only checks for a password based on the principal and the simpler
123 checks available through the new configuration variables are done.
124 This mode is mostly useful for testing, since such simple checking can
125 more easily be done via less complex password strength configurations.
127 The check for passwords based on the principal now check for passwords
128 formed by reversing or adding numbers before and after each separate
129 component of the principal. This will catch passwords based on the
130 realm or components of the realm, which will often catch passwords
131 based on the name of the local institution.
133 The plugin now sets the Kerberos error message in the context to pass
134 error information, resulting in higher-quality error reporting in the
137 CrackLib checks for passwords where a character is a simple increment
138 or decrement of the previous character. In previous versions, the
139 embedded version of CrackLib allowed at most four such occurrences in
140 the entire password. This results in false positives on long
141 passphrases, since such accidental letter relationships aren't
142 uncommon in human languages. Change the embedded CrackLib to allow
143 one such simple increment for every three characters in the password,
144 which tightens the check somewhat for shorter passwords and loosens it
145 considerably for longer passwords.
147 Expect the Heimdal password strength checking plugin header in
148 kadm5/kadm5-pwcheck.h instead of outside of the kadm5 directory. This
149 is the path used by current versions of Heimdal. Drop support for
150 older versions of Heimdal that don't install this header file.
152 Update to rra-c-util 4.9:
154 * Probe for Kerberos headers using file checks instead of compiles.
155 * Improve probe for the Heimdal libroken library.
156 * Always build with large file support.
157 * Conditionally call AM_PROG_AR for portability to new Autotools.
159 Update to C TAP Harness 2.2:
161 * Allow more easily running single programs under tests/runtests.
162 * Flush the output from the test harness after each test.
164 krb5-strength 1.1 (2012-05-11)
166 Change the minimum password length in the embedded CrackLib to 8.
168 Reject passwords formed from the username portion of the principal
169 with digits appended.
171 In the embedded CrackLib, also check for a duplicated dictionary word.
173 Support linking with the system CrackLib instead of the embedded and
174 stricter copy by passing --with-cracklib to configure.
176 Fix variable sizes in the embedded CrackLib on 64-bit platforms. This
177 may fix interoperability problems with databases created on platforms
178 with a different native integer size. Thanks, Karl Lehnberger and
181 Stop using local in the test suite for portability to Solaris /bin/sh.
183 Update to rra-c-util 4.4:
185 * Use PATH_KRB5_CONFIG to override krb5-config location.
186 * Fix probing for ibm_svc/krb5_svc.h on AIX.
187 * Support Heimdal libraries without libroken, like OpenBSD.
188 * Fix manual Kerberos library probing without transitive dependencies.
189 * Support systems that only have krb5/krb5.h.
190 * Pass --deps to krb5-config in the non-reduced-dependencies case.
191 * Silence __attribute__ warnings on more compilers.
192 * Update warning flags for make warnings.
193 * Flesh out MAINTCLEANFILES to remove autogen results.
194 * Add notices to all files copied from rra-c-util.
196 Update to C TAP Harness 1.12:
198 * Drop is_double from the C TAP library to avoid requiring -lm.
199 * Avoid using local in the shell libtap.sh library.
200 * Silence __attribute__ warnings on more compilers.
201 * runtests now frees all allocated resources on exit.
202 * Fix runtests to still honor SOURCE and -s without BUILD and -b.
203 * Add tests/HOWTO documenting how to add new tests.
204 * Ensure correct output ordering in test results.
205 * Add -h and a better usage message to tests/runtests.
207 krb5-strength 1.0 (2010-02-16)
209 Add heimdal-strength, a program that checks password strength using
210 the protocol for a Heimdal external check program.
212 The shared module now also exports the interface expected by Heimdal's
213 dynamically loaded password strength checking API and can be used as a
214 Heimdal kadmin plugin.
216 Add a new plugin API for MIT Kerberos modelled after the plugin API
217 used for other MIT Kerberos plugins. Thanks to Marcus Watts for
218 substantial research and contributions to the interface design. This
219 work is incomplete in this release, missing the corresponding patch to
222 Fixed the data format written by the included packer program to add
223 enough nul bytes at the end of the data. Previously, there was not
224 enough trailing nul bytes for the expected input format, leading to
225 uninitialized memory reads in the password lookup.
227 Add a test suite using the driver and library from C TAP Harness 1.1.
229 Add portability code for platforms without a working snprintf or other
230 deficiencies and updated the code to take advantage of those
233 krb5-strength 0.5 (2007-07-18)
235 The check of the password against the principal checked against the
236 fully-qualified principal, which is not the usual problem.
237 Additionally check that the password doesn't match the principal with
238 the realm removed or the reverse of that (case-insensitive).
240 krb5-strength 0.4 (2007-03-28)
242 The patches directory was omitted from the distribution. Really
245 krb5-strength 0.3 (2007-03-23)
247 Initial public release. Includes a patch for MIT Kerberos, a slightly
248 modified version of CrackLib, and glue wrapped around CrackLib to make