1 User-Visible krb5-strength Changes
3 krb5-strength 3.2 (2020-05-17)
5 Add new -c (--check-only) option to heimdal-history to check whether a
6 password would be accepted without updating the history or password
7 length databases. Based on work by macrotex.
9 Increase hash iterations for heimdal-history by roughly a factor of
10 four to increase the time required for a password hash to about 0.1
11 seconds on modern hardware. This will affect newly-stored history
12 entries but will not invalidate existing password history entries.
14 Support building without CrackLib support by passing
15 --without-cracklib to configure. This makes the code a bit simpler
16 and lighter if you don't intend to ever use the CrackLib support.
18 krb5-strength-wordlist now requires Perl 5.010 or later.
20 Use explicit_bzero instead of memset, where available, to overwrite
21 copies of passwords before freeing memory. This reduces the lifetime
22 of passwords in memory.
24 Skip tests that require the stronger rule configuration in the
25 embedded CrackLib when built against system CrackLib. This avoids
26 test failures when built with system CrackLib.
28 Rework the check-valgrind target to use the new C TAP Harness valgrind
29 support and automatically check the valgrind log files for errors at
30 the end of the test suite.
32 Add SPDX-License-Identifier headers to all substantial source files
33 other than those in the bundled version of CrackLib.
35 Update to rra-c-util 8.2:
37 * Implement explicit_bzero with memset if it is not available.
38 * Reformat all C source using clang-format 10.
39 * Work around Test::Strict not skipping .git directories.
40 * Fix warnings with perltidy 20190601 and Perl::Critic 1.134.
41 * Improve check for obsolete strings.
42 * Use a more standard all-permissive license.
43 * Add SPDX-License-Identifier headers to all substantial source files.
44 * Skip more build system files when running the test suite.
45 * Fix warnings with Clang 10, GCC 10, and the Clang static analyzer.
46 * Exclude more valgrind false positives with Kerberos libraries.
48 Update to C TAP Harness 4.7:
50 * Fix warnings with GCC 10.
51 * Reformat all C source using clang-format 10.
52 * Fixed malloc error checking in bstrndup.
53 * Add support for valgrind testing via test list options.
54 * Report test failures as left and right, not wanted and seen.
55 * Fix is_string comparisons involving NULL pointers and "(null)".
56 * Add SPDX-License-Identifier headers to all substantial source files.
58 krb5-strength 3.1 (2016-12-25)
60 A new configuration option, cracklib_maxlen, can be set to skip
61 CrackLib checks of passwords longer than that length. The CrackLib
62 rules were designed in a world in which most passwords were four to
63 eight characters long and tend to spuriously reject longer passwords.
64 SQLite dictionaries work better for checking longer passwords and
65 passphrases. Patch from Jorj Bauer.
67 The require_classes configuration option can now require a particular
68 number of character classes in the password (whatever those classes
69 are). Patch from Toby Blake.
71 Change the error messages returned for passwords that fail strength
72 checking to start with a capital letter. This appears to be more
73 consistent with the error message conventions used inside Heimdal.
75 Change the DB_File::Lock calling method in heimdal-history to work
76 properly with the (buggy) CPAN version of DB_File::Lock, instead of
77 relying on Debian's patched version. Thanks to Bernt Jernberg for the
80 Apply the SuSE patch for a buffer overflow when using duplicate rules
81 to the embedded CrackLib. No duplicating rules are used in the rule
82 set included with this package, and this package doesn't expose the
83 general API, so this was not exploitable, but best to close the latent
84 issue. (The other recent CrackLib vulnerability, CVE-2016-6318,
85 doesn't apply since all the GECOS manipulation code was removed from
86 the embedded CrackLib in this package.)
88 Patch the mkdict and packer in the embedded copy of CrackLib to force
89 C locale when sorting (avoiding a corrupted dictionary) and warn and
90 skip out-of-order words rather than creating a corrupted dictionary.
91 Patch from Mark Sirota.
93 Configuration instrutions are now in the heimdal-history and
94 heimdal-strength man pages and a new krb5-strength man page (which
95 documents configuration of the KDC plugin) instead of the README file
96 to make it more accessible after the software has been installed.
98 Update to rra-c-util 6.2:
100 * Use calloc in preference to malloc wherever appropriate.
101 * Use reallocarray in preference to realloc wherever appropriate.
102 * Suppress warnings from Kerberos headers under make warnings.
103 * Support the embedded Kerberos in Solaris 10 in library probes.
104 * Add missing va_end in xasprintf implementation.
105 * Fix logic in Test::RRA::Automake for new Automake dist checking.
106 * Fix all return-value checks for snprintf to avoid off-by-one error.
107 * Update warning flags for make warnings to GCC 6.1.0.
108 * Fix Test::RRA::Config for new "do" semantics in Perl 5.22.2.
109 * Add a new test for obsolete eyrie.org URLs.
110 * Require Test::Strict 0.25 or newer for Perl strictness checks.
112 Update to C TAP Harness 4.1:
114 * Replace all remaining uses of sprintf.
115 * Test lists may now have comments and blank lines.
116 * runtests -v will show the complete output from a test.
117 * Fix segfault in runtests when given an empty test list.
118 * Tests use C_TAP_SOURCE and C_TAP_BUILD instead of SOURCE and BUILD.
120 krb5-strength 3.0 (2014-03-25)
122 The krb5-strength plugin and heimdal-strength program now support a
123 SQLite password dictionary. This format of dictionary can detect any
124 password within edit distance one of a dictionary word, meaning that
125 the dictionary word can be formed by adding, removing, or changing a
126 single character in the password. A SQLite password dictionary can be
127 used alone or in combination with any of the other supported
128 dictionary types. SQLite dictionary support is based on work by David
131 cdbmake-wordlist has been renamed to krb5-strength-wordlist.
132 Generating CDB dictionaries now requires the -c option; see the
133 documentation for more information. A SQLite database of dictionary
134 words can now be created instead, using the -s option.
136 A password history implementation for Heimdal is now included. This
137 is a separate Perl program, heimdal-history, that stacks with the
138 external program implementation of strength checking. It is not
139 available in the form of a plugin, only as a Heimdal external password
140 quality check. (MIT Kerberos provides its own password history
141 mechanism.) This program has more extensive Perl module dependencies
142 than the other programs in this distribution.
144 A new configuration option, minimum_different, can be set to require
145 that passwords contain at least that many unique characters. This can
146 be used to reject long strings of identical characters or short
147 patterns, which may pass other checks but still be too easy to guess.
149 Update to rra-c-util 5.4:
151 * Fix portable/krb5.h build with a C++ compiler.
152 * Use Lancaster Consensus environment variables to control tests.
153 * Work around perltidy bug that leaves behind stray log files.
155 Update to C TAP Harness 3.0:
157 * Reopen standard input to /dev/null when running a test list.
158 * Don't leak extraneous file descriptors to tests.
160 krb5-strength 2.2 (2013-12-16)
162 More complex character class requirements can be specified with the
163 configuration option require_classes. This option lists the character
164 classes the password must contain. These restrictions may be
165 qualified with password length ranges, allowing the requirements to
166 change with the length of the password. See README for more details
167 and the option syntax.
169 cdbmake-wordlist now supports filtering out words based on maximum
170 length (-L) and arbitrary user-provided regular expressions (-x). It
171 also supports running in filter mode to produce a new wordlist instead
174 Close a file descriptor and memory leak in the included version of
175 CrackLib. This problem was already fixed in CrackLib 2.9.0.
177 Update to rra-c-util 4.12:
179 * Properly check the return status of snprintf and friends.
181 Update to C TAP Harness 2.3:
183 * Suppress lazy plans and test summaries if the test failed with bail.
184 * Add warn_unused_result gcc attributes to relevant functions.
186 krb5-strength 2.1 (2013-10-10)
188 Fix the package build when CDB support is disabled or TinyCDB was not
191 Some of the password rejection error messages have been changed to
192 make them more accurate or comprehensible to the user.
194 Passing --with-tinycdb to configure now correctly makes TinyCDB
195 support mandatory without adding bogus directories to the library and
196 include search paths.
198 krb5-strength 2.0 (2013-10-07)
200 Add support for the MIT Kerberos password quality plugin interface,
201 available in MIT Kerberos 1.9 and later, contributed by Greg Hudson
202 and MIT. Drop the patch for MIT Kerberos 1.4 (and hence support for
203 versions of MIT Kerberos prior to 1.9). A dictionary path set in
204 krb5.conf takes precedence over the dictionary path provided by MIT
205 Kerberos when the plugin is initialized, if both are set, to allow the
206 dict_path configuration setting to be used for other plugins while
207 using a separate dictionary for krb5-strength.
209 The default installation path for this plugin is now
210 /usr/local/lib/krb5/plugins/pwqual/strength.so (for both MIT and
211 Heimdal), assuming a --libdir setting of /usr/local/lib. This may
212 require updates to the Kerberos KDC configuration or moving the plugin
213 when upgrading from earlier versions.
215 Add support for building with TinyCDB and then checking passwords
216 against a CDB database. There is a new password_dictionary_cdb
217 krb5.conf configuration setting that configures a CDB directory to
218 use. The tests with a CDB dictionary are much simpler: passwords are
219 rejected if found in the dictionary either literally, with one or two
220 characters removed from the start or end, or with one character
221 removed from both the start and the end. Both a CrackLib and a CDB
222 dictionary can be specified to check both dictionaries. A new
223 cdbmake-wordlist utility (written in Perl) is included to ease the
224 process of creating a CDB database from a simple word list.
226 A minimum password length can now be enforced directly via the plugin
227 or external check program without relying on CrackLib. To set a
228 minimum password length, add a minimum_length setting to the
229 krb5-strength section of [appdefaults] in krb5.conf.
231 New boolean settings require_ascii_printable and require_non_letter
232 are supported in the krb5-strength setting of [appdefaults] in
233 krb5.conf. The former rejects passwords containing characters other
234 than printable ASCII characters (including space), and the latter
235 requires that passwords contain at least one character that is not a
236 letter (upper or lower case) or a space.
238 The plugin can now be configured without a dictionary, in which case
239 only checks for a password based on the principal and the simpler
240 checks available through the new configuration variables are done.
241 This mode is mostly useful for testing, since such simple checking can
242 more easily be done via less complex password strength configurations.
244 The check for passwords based on the principal now check for passwords
245 formed by reversing or adding numbers before and after each separate
246 component of the principal. This will catch passwords based on the
247 realm or components of the realm, which will often catch passwords
248 based on the name of the local institution.
250 The plugin now sets the Kerberos error message in the context to pass
251 error information, resulting in higher-quality error reporting in the
254 CrackLib checks for passwords where a character is a simple increment
255 or decrement of the previous character. In previous versions, the
256 embedded version of CrackLib allowed at most four such occurrences in
257 the entire password. This results in false positives on long
258 passphrases, since such accidental letter relationships aren't
259 uncommon in human languages. Change the embedded CrackLib to allow
260 one such simple increment for every three characters in the password,
261 which tightens the check somewhat for shorter passwords and loosens it
262 considerably for longer passwords.
264 Expect the Heimdal password strength checking plugin header in
265 kadm5/kadm5-pwcheck.h instead of outside of the kadm5 directory. This
266 is the path used by current versions of Heimdal. Drop support for
267 older versions of Heimdal that don't install this header file.
269 Update to rra-c-util 4.9:
271 * Probe for Kerberos headers using file checks instead of compiles.
272 * Improve probe for the Heimdal libroken library.
273 * Always build with large file support.
274 * Conditionally call AM_PROG_AR for portability to new Autotools.
276 Update to C TAP Harness 2.2:
278 * Allow more easily running single programs under tests/runtests.
279 * Flush the output from the test harness after each test.
281 krb5-strength 1.1 (2012-05-11)
283 Change the minimum password length in the embedded CrackLib to 8.
285 Reject passwords formed from the username portion of the principal
286 with digits appended.
288 In the embedded CrackLib, also check for a duplicated dictionary word.
290 Support linking with the system CrackLib instead of the embedded and
291 stricter copy by passing --with-cracklib to configure.
293 Fix variable sizes in the embedded CrackLib on 64-bit platforms. This
294 may fix interoperability problems with databases created on platforms
295 with a different native integer size. Thanks, Karl Lehnberger and
298 Stop using local in the test suite for portability to Solaris /bin/sh.
300 Update to rra-c-util 4.4:
302 * Use PATH_KRB5_CONFIG to override krb5-config location.
303 * Fix probing for ibm_svc/krb5_svc.h on AIX.
304 * Support Heimdal libraries without libroken, like OpenBSD.
305 * Fix manual Kerberos library probing without transitive dependencies.
306 * Support systems that only have krb5/krb5.h.
307 * Pass --deps to krb5-config in the non-reduced-dependencies case.
308 * Silence __attribute__ warnings on more compilers.
309 * Update warning flags for make warnings.
310 * Flesh out MAINTCLEANFILES to remove autogen results.
311 * Add notices to all files copied from rra-c-util.
313 Update to C TAP Harness 1.12:
315 * Drop is_double from the C TAP library to avoid requiring -lm.
316 * Avoid using local in the shell libtap.sh library.
317 * Silence __attribute__ warnings on more compilers.
318 * runtests now frees all allocated resources on exit.
319 * Fix runtests to still honor SOURCE and -s without BUILD and -b.
320 * Add tests/HOWTO documenting how to add new tests.
321 * Ensure correct output ordering in test results.
322 * Add -h and a better usage message to tests/runtests.
324 krb5-strength 1.0 (2010-02-16)
326 Add heimdal-strength, a program that checks password strength using
327 the protocol for a Heimdal external check program.
329 The shared module now also exports the interface expected by Heimdal's
330 dynamically loaded password strength checking API and can be used as a
331 Heimdal kadmin plugin.
333 Add a new plugin API for MIT Kerberos modelled after the plugin API
334 used for other MIT Kerberos plugins. Thanks to Marcus Watts for
335 substantial research and contributions to the interface design. This
336 work is incomplete in this release, missing the corresponding patch to
339 Fixed the data format written by the included packer program to add
340 enough nul bytes at the end of the data. Previously, there was not
341 enough trailing nul bytes for the expected input format, leading to
342 uninitialized memory reads in the password lookup.
344 Add a test suite using the driver and library from C TAP Harness 1.1.
346 Add portability code for platforms without a working snprintf or other
347 deficiencies and updated the code to take advantage of those
350 krb5-strength 0.5 (2007-07-18)
352 The check of the password against the principal checked against the
353 fully-qualified principal, which is not the usual problem.
354 Additionally check that the password doesn't match the principal with
355 the realm removed or the reverse of that (case-insensitive).
357 krb5-strength 0.4 (2007-03-28)
359 The patches directory was omitted from the distribution. Really
362 krb5-strength 0.3 (2007-03-23)
364 Initial public release. Includes a patch for MIT Kerberos, a slightly
365 modified version of CrackLib, and glue wrapped around CrackLib to make