1 User-Visible krb5-strength Changes
3 krb5-strength 3.1 (unreleased)
5 A new configuration option, cracklib_maxlen, can be set to skip
6 CrackLib checks of passwords longer than that length. The CrackLib
7 rules were designed in a world in which most passwords were four to
8 eight characters long and tend to spuriously reject longer passwords.
9 SQLite dictionaries work better for checking longer passwords and
10 passphrases. Patch from Jorj Bauer.
12 Change the error messages returned for passwords that fail strength
13 checking to start with a capital letter. This appears to be more
14 consistent with the error message conventions used inside Heimdal.
16 Change the DB_File::Lock calling method in heimdal-history to work
17 properly with the (buggy) CPAN version of DB_File::Lock, instead of
18 relying on Debian's patched version. Thanks to Bernt Jernberg for the
21 Apply the SuSE patch for a buffer overflow when using duplicate rules
22 to the embedded CrackLib. No duplicating rules are used in the rule
23 set included with this package, and this package doesn't expose the
24 general API, so this was not exploitable, but best to close the latent
25 issue. (The other recent CrackLib vulnerability, CVE-2016-6318,
26 doesn't apply since all the GECOS manipulation code was removed from
27 the embedded CrackLib in this package.)
29 Patch the mkdict and packer in the embedded copy of CrackLib to force
30 C locale when sorting (avoiding a corrupted dictionary) and warn and
31 skip out-of-order words rather than creating a corrupted dictionary.
32 Patch from Mark Sirota.
34 Configuration instrutions are now in the heimdal-history and
35 heimdal-strength man pages and a new krb5-strength man page (which
36 documents configuration of the KDC plugin) instead of the README file
37 to make it more accessible after the software has been installed.
39 Update to rra-c-util 6.2:
41 * Use calloc in preference to malloc wherever appropriate.
42 * Use reallocarray in preference to realloc wherever appropriate.
43 * Suppress warnings from Kerberos headers under make warnings.
44 * Support the embedded Kerberos in Solaris 10 in library probes.
45 * Add missing va_end in xasprintf implementation.
46 * Fix logic in Test::RRA::Automake for new Automake dist checking.
47 * Fix all return-value checks for snprintf to avoid off-by-one error.
48 * Update warning flags for make warnings to GCC 6.1.0.
49 * Fix Test::RRA::Config for new "do" semantics in Perl 5.22.2.
50 * Add a new test for obsolete eyrie.org URLs.
51 * Require Test::Strict 0.25 or newer for Perl strictness checks.
53 Update to C TAP Harness 4.1:
55 * Replace all remaining uses of sprintf.
56 * Test lists may now have comments and blank lines.
57 * runtests -v will show the complete output from a test.
58 * Fix segfault in runtests when given an empty test list.
59 * Tests use C_TAP_SOURCE and C_TAP_BUILD instead of SOURCE and BUILD.
61 krb5-strength 3.0 (2014-03-25)
63 The krb5-strength plugin and heimdal-strength program now support a
64 SQLite password dictionary. This format of dictionary can detect any
65 password within edit distance one of a dictionary word, meaning that
66 the dictionary word can be formed by adding, removing, or changing a
67 single character in the password. A SQLite password dictionary can be
68 used alone or in combination with any of the other supported
69 dictionary types. SQLite dictionary support is based on work by David
72 cdbmake-wordlist has been renamed to krb5-strength-wordlist.
73 Generating CDB dictionaries now requires the -c option; see the
74 documentation for more information. A SQLite database of dictionary
75 words can now be created instead, using the -s option.
77 A password history implementation for Heimdal is now included. This
78 is a separate Perl program, heimdal-history, that stacks with the
79 external program implementation of strength checking. It is not
80 available in the form of a plugin, only as a Heimdal external password
81 quality check. (MIT Kerberos provides its own password history
82 mechanism.) This program has more extensive Perl module dependencies
83 than the other programs in this distribution.
85 A new configuration option, minimum_different, can be set to require
86 that passwords contain at least that many unique characters. This can
87 be used to reject long strings of identical characters or short
88 patterns, which may pass other checks but still be too easy to guess.
90 Update to rra-c-util 5.4:
92 * Fix portable/krb5.h build with a C++ compiler.
93 * Use Lancaster Consensus environment variables to control tests.
94 * Work around perltidy bug that leaves behind stray log files.
96 Update to C TAP Harness 3.0:
98 * Reopen standard input to /dev/null when running a test list.
99 * Don't leak extraneous file descriptors to tests.
101 krb5-strength 2.2 (2013-12-16)
103 More complex character class requirements can be specified with the
104 configuration option require_classes. This option lists the character
105 classes the password must contain. These restrictions may be
106 qualified with password length ranges, allowing the requirements to
107 change with the length of the password. See README for more details
108 and the option syntax.
110 cdbmake-wordlist now supports filtering out words based on maximum
111 length (-L) and arbitrary user-provided regular expressions (-x). It
112 also supports running in filter mode to produce a new wordlist instead
115 Close a file descriptor and memory leak in the included version of
116 CrackLib. This problem was already fixed in CrackLib 2.9.0.
118 Update to rra-c-util 4.12:
120 * Properly check the return status of snprintf and friends.
122 Update to C TAP Harness 2.3:
124 * Suppress lazy plans and test summaries if the test failed with bail.
125 * Add warn_unused_result gcc attributes to relevant functions.
127 krb5-strength 2.1 (2013-10-10)
129 Fix the package build when CDB support is disabled or TinyCDB was not
132 Some of the password rejection error messages have been changed to
133 make them more accurate or comprehensible to the user.
135 Passing --with-tinycdb to configure now correctly makes TinyCDB
136 support mandatory without adding bogus directories to the library and
137 include search paths.
139 krb5-strength 2.0 (2013-10-07)
141 Add support for the MIT Kerberos password quality plugin interface,
142 available in MIT Kerberos 1.9 and later, contributed by Greg Hudson
143 and MIT. Drop the patch for MIT Kerberos 1.4 (and hence support for
144 versions of MIT Kerberos prior to 1.9). A dictionary path set in
145 krb5.conf takes precedence over the dictionary path provided by MIT
146 Kerberos when the plugin is initialized, if both are set, to allow the
147 dict_path configuration setting to be used for other plugins while
148 using a separate dictionary for krb5-strength.
150 The default installation path for this plugin is now
151 /usr/local/lib/krb5/plugins/pwqual/strength.so (for both MIT and
152 Heimdal), assuming a --libdir setting of /usr/local/lib. This may
153 require updates to the Kerberos KDC configuration or moving the plugin
154 when upgrading from earlier versions.
156 Add support for building with TinyCDB and then checking passwords
157 against a CDB database. There is a new password_dictionary_cdb
158 krb5.conf configuration setting that configures a CDB directory to
159 use. The tests with a CDB dictionary are much simpler: passwords are
160 rejected if found in the dictionary either literally, with one or two
161 characters removed from the start or end, or with one character
162 removed from both the start and the end. Both a CrackLib and a CDB
163 dictionary can be specified to check both dictionaries. A new
164 cdbmake-wordlist utility (written in Perl) is included to ease the
165 process of creating a CDB database from a simple word list.
167 A minimum password length can now be enforced directly via the plugin
168 or external check program without relying on CrackLib. To set a
169 minimum password length, add a minimum_length setting to the
170 krb5-strength section of [appdefaults] in krb5.conf.
172 New boolean settings require_ascii_printable and require_non_letter
173 are supported in the krb5-strength setting of [appdefaults] in
174 krb5.conf. The former rejects passwords containing characters other
175 than printable ASCII characters (including space), and the latter
176 requires that passwords contain at least one character that is not a
177 letter (upper or lower case) or a space.
179 The plugin can now be configured without a dictionary, in which case
180 only checks for a password based on the principal and the simpler
181 checks available through the new configuration variables are done.
182 This mode is mostly useful for testing, since such simple checking can
183 more easily be done via less complex password strength configurations.
185 The check for passwords based on the principal now check for passwords
186 formed by reversing or adding numbers before and after each separate
187 component of the principal. This will catch passwords based on the
188 realm or components of the realm, which will often catch passwords
189 based on the name of the local institution.
191 The plugin now sets the Kerberos error message in the context to pass
192 error information, resulting in higher-quality error reporting in the
195 CrackLib checks for passwords where a character is a simple increment
196 or decrement of the previous character. In previous versions, the
197 embedded version of CrackLib allowed at most four such occurrences in
198 the entire password. This results in false positives on long
199 passphrases, since such accidental letter relationships aren't
200 uncommon in human languages. Change the embedded CrackLib to allow
201 one such simple increment for every three characters in the password,
202 which tightens the check somewhat for shorter passwords and loosens it
203 considerably for longer passwords.
205 Expect the Heimdal password strength checking plugin header in
206 kadm5/kadm5-pwcheck.h instead of outside of the kadm5 directory. This
207 is the path used by current versions of Heimdal. Drop support for
208 older versions of Heimdal that don't install this header file.
210 Update to rra-c-util 4.9:
212 * Probe for Kerberos headers using file checks instead of compiles.
213 * Improve probe for the Heimdal libroken library.
214 * Always build with large file support.
215 * Conditionally call AM_PROG_AR for portability to new Autotools.
217 Update to C TAP Harness 2.2:
219 * Allow more easily running single programs under tests/runtests.
220 * Flush the output from the test harness after each test.
222 krb5-strength 1.1 (2012-05-11)
224 Change the minimum password length in the embedded CrackLib to 8.
226 Reject passwords formed from the username portion of the principal
227 with digits appended.
229 In the embedded CrackLib, also check for a duplicated dictionary word.
231 Support linking with the system CrackLib instead of the embedded and
232 stricter copy by passing --with-cracklib to configure.
234 Fix variable sizes in the embedded CrackLib on 64-bit platforms. This
235 may fix interoperability problems with databases created on platforms
236 with a different native integer size. Thanks, Karl Lehnberger and
239 Stop using local in the test suite for portability to Solaris /bin/sh.
241 Update to rra-c-util 4.4:
243 * Use PATH_KRB5_CONFIG to override krb5-config location.
244 * Fix probing for ibm_svc/krb5_svc.h on AIX.
245 * Support Heimdal libraries without libroken, like OpenBSD.
246 * Fix manual Kerberos library probing without transitive dependencies.
247 * Support systems that only have krb5/krb5.h.
248 * Pass --deps to krb5-config in the non-reduced-dependencies case.
249 * Silence __attribute__ warnings on more compilers.
250 * Update warning flags for make warnings.
251 * Flesh out MAINTCLEANFILES to remove autogen results.
252 * Add notices to all files copied from rra-c-util.
254 Update to C TAP Harness 1.12:
256 * Drop is_double from the C TAP library to avoid requiring -lm.
257 * Avoid using local in the shell libtap.sh library.
258 * Silence __attribute__ warnings on more compilers.
259 * runtests now frees all allocated resources on exit.
260 * Fix runtests to still honor SOURCE and -s without BUILD and -b.
261 * Add tests/HOWTO documenting how to add new tests.
262 * Ensure correct output ordering in test results.
263 * Add -h and a better usage message to tests/runtests.
265 krb5-strength 1.0 (2010-02-16)
267 Add heimdal-strength, a program that checks password strength using
268 the protocol for a Heimdal external check program.
270 The shared module now also exports the interface expected by Heimdal's
271 dynamically loaded password strength checking API and can be used as a
272 Heimdal kadmin plugin.
274 Add a new plugin API for MIT Kerberos modelled after the plugin API
275 used for other MIT Kerberos plugins. Thanks to Marcus Watts for
276 substantial research and contributions to the interface design. This
277 work is incomplete in this release, missing the corresponding patch to
280 Fixed the data format written by the included packer program to add
281 enough nul bytes at the end of the data. Previously, there was not
282 enough trailing nul bytes for the expected input format, leading to
283 uninitialized memory reads in the password lookup.
285 Add a test suite using the driver and library from C TAP Harness 1.1.
287 Add portability code for platforms without a working snprintf or other
288 deficiencies and updated the code to take advantage of those
291 krb5-strength 0.5 (2007-07-18)
293 The check of the password against the principal checked against the
294 fully-qualified principal, which is not the usual problem.
295 Additionally check that the password doesn't match the principal with
296 the realm removed or the reverse of that (case-insensitive).
298 krb5-strength 0.4 (2007-03-28)
300 The patches directory was omitted from the distribution. Really
303 krb5-strength 0.3 (2007-03-23)
305 Initial public release. Includes a patch for MIT Kerberos, a slightly
306 modified version of CrackLib, and glue wrapped around CrackLib to make