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.
47 * Improve support for AIX's bundled Kerberos.
49 Update to C TAP Harness 4.7:
51 * Fix warnings with GCC 10.
52 * Reformat all C source using clang-format 10.
53 * Fixed malloc error checking in bstrndup.
54 * Add support for valgrind testing via test list options.
55 * Report test failures as left and right, not wanted and seen.
56 * Fix is_string comparisons involving NULL pointers and "(null)".
57 * Add SPDX-License-Identifier headers to all substantial source files.
59 krb5-strength 3.1 (2016-12-25)
61 A new configuration option, cracklib_maxlen, can be set to skip
62 CrackLib checks of passwords longer than that length. The CrackLib
63 rules were designed in a world in which most passwords were four to
64 eight characters long and tend to spuriously reject longer passwords.
65 SQLite dictionaries work better for checking longer passwords and
66 passphrases. Patch from Jorj Bauer.
68 The require_classes configuration option can now require a particular
69 number of character classes in the password (whatever those classes
70 are). Patch from Toby Blake.
72 Change the error messages returned for passwords that fail strength
73 checking to start with a capital letter. This appears to be more
74 consistent with the error message conventions used inside Heimdal.
76 Change the DB_File::Lock calling method in heimdal-history to work
77 properly with the (buggy) CPAN version of DB_File::Lock, instead of
78 relying on Debian's patched version. Thanks to Bernt Jernberg for the
81 Apply the SuSE patch for a buffer overflow when using duplicate rules
82 to the embedded CrackLib. No duplicating rules are used in the rule
83 set included with this package, and this package doesn't expose the
84 general API, so this was not exploitable, but best to close the latent
85 issue. (The other recent CrackLib vulnerability, CVE-2016-6318,
86 doesn't apply since all the GECOS manipulation code was removed from
87 the embedded CrackLib in this package.)
89 Patch the mkdict and packer in the embedded copy of CrackLib to force
90 C locale when sorting (avoiding a corrupted dictionary) and warn and
91 skip out-of-order words rather than creating a corrupted dictionary.
92 Patch from Mark Sirota.
94 Configuration instrutions are now in the heimdal-history and
95 heimdal-strength man pages and a new krb5-strength man page (which
96 documents configuration of the KDC plugin) instead of the README file
97 to make it more accessible after the software has been installed.
99 Update to rra-c-util 6.2:
101 * Use calloc in preference to malloc wherever appropriate.
102 * Use reallocarray in preference to realloc wherever appropriate.
103 * Suppress warnings from Kerberos headers under make warnings.
104 * Support the embedded Kerberos in Solaris 10 in library probes.
105 * Add missing va_end in xasprintf implementation.
106 * Fix logic in Test::RRA::Automake for new Automake dist checking.
107 * Fix all return-value checks for snprintf to avoid off-by-one error.
108 * Update warning flags for make warnings to GCC 6.1.0.
109 * Fix Test::RRA::Config for new "do" semantics in Perl 5.22.2.
110 * Add a new test for obsolete eyrie.org URLs.
111 * Require Test::Strict 0.25 or newer for Perl strictness checks.
113 Update to C TAP Harness 4.1:
115 * Replace all remaining uses of sprintf.
116 * Test lists may now have comments and blank lines.
117 * runtests -v will show the complete output from a test.
118 * Fix segfault in runtests when given an empty test list.
119 * Tests use C_TAP_SOURCE and C_TAP_BUILD instead of SOURCE and BUILD.
121 krb5-strength 3.0 (2014-03-25)
123 The krb5-strength plugin and heimdal-strength program now support a
124 SQLite password dictionary. This format of dictionary can detect any
125 password within edit distance one of a dictionary word, meaning that
126 the dictionary word can be formed by adding, removing, or changing a
127 single character in the password. A SQLite password dictionary can be
128 used alone or in combination with any of the other supported
129 dictionary types. SQLite dictionary support is based on work by David
132 cdbmake-wordlist has been renamed to krb5-strength-wordlist.
133 Generating CDB dictionaries now requires the -c option; see the
134 documentation for more information. A SQLite database of dictionary
135 words can now be created instead, using the -s option.
137 A password history implementation for Heimdal is now included. This
138 is a separate Perl program, heimdal-history, that stacks with the
139 external program implementation of strength checking. It is not
140 available in the form of a plugin, only as a Heimdal external password
141 quality check. (MIT Kerberos provides its own password history
142 mechanism.) This program has more extensive Perl module dependencies
143 than the other programs in this distribution.
145 A new configuration option, minimum_different, can be set to require
146 that passwords contain at least that many unique characters. This can
147 be used to reject long strings of identical characters or short
148 patterns, which may pass other checks but still be too easy to guess.
150 Update to rra-c-util 5.4:
152 * Fix portable/krb5.h build with a C++ compiler.
153 * Use Lancaster Consensus environment variables to control tests.
154 * Work around perltidy bug that leaves behind stray log files.
156 Update to C TAP Harness 3.0:
158 * Reopen standard input to /dev/null when running a test list.
159 * Don't leak extraneous file descriptors to tests.
161 krb5-strength 2.2 (2013-12-16)
163 More complex character class requirements can be specified with the
164 configuration option require_classes. This option lists the character
165 classes the password must contain. These restrictions may be
166 qualified with password length ranges, allowing the requirements to
167 change with the length of the password. See README for more details
168 and the option syntax.
170 cdbmake-wordlist now supports filtering out words based on maximum
171 length (-L) and arbitrary user-provided regular expressions (-x). It
172 also supports running in filter mode to produce a new wordlist instead
175 Close a file descriptor and memory leak in the included version of
176 CrackLib. This problem was already fixed in CrackLib 2.9.0.
178 Update to rra-c-util 4.12:
180 * Properly check the return status of snprintf and friends.
182 Update to C TAP Harness 2.3:
184 * Suppress lazy plans and test summaries if the test failed with bail.
185 * Add warn_unused_result gcc attributes to relevant functions.
187 krb5-strength 2.1 (2013-10-10)
189 Fix the package build when CDB support is disabled or TinyCDB was not
192 Some of the password rejection error messages have been changed to
193 make them more accurate or comprehensible to the user.
195 Passing --with-tinycdb to configure now correctly makes TinyCDB
196 support mandatory without adding bogus directories to the library and
197 include search paths.
199 krb5-strength 2.0 (2013-10-07)
201 Add support for the MIT Kerberos password quality plugin interface,
202 available in MIT Kerberos 1.9 and later, contributed by Greg Hudson
203 and MIT. Drop the patch for MIT Kerberos 1.4 (and hence support for
204 versions of MIT Kerberos prior to 1.9). A dictionary path set in
205 krb5.conf takes precedence over the dictionary path provided by MIT
206 Kerberos when the plugin is initialized, if both are set, to allow the
207 dict_path configuration setting to be used for other plugins while
208 using a separate dictionary for krb5-strength.
210 The default installation path for this plugin is now
211 /usr/local/lib/krb5/plugins/pwqual/strength.so (for both MIT and
212 Heimdal), assuming a --libdir setting of /usr/local/lib. This may
213 require updates to the Kerberos KDC configuration or moving the plugin
214 when upgrading from earlier versions.
216 Add support for building with TinyCDB and then checking passwords
217 against a CDB database. There is a new password_dictionary_cdb
218 krb5.conf configuration setting that configures a CDB directory to
219 use. The tests with a CDB dictionary are much simpler: passwords are
220 rejected if found in the dictionary either literally, with one or two
221 characters removed from the start or end, or with one character
222 removed from both the start and the end. Both a CrackLib and a CDB
223 dictionary can be specified to check both dictionaries. A new
224 cdbmake-wordlist utility (written in Perl) is included to ease the
225 process of creating a CDB database from a simple word list.
227 A minimum password length can now be enforced directly via the plugin
228 or external check program without relying on CrackLib. To set a
229 minimum password length, add a minimum_length setting to the
230 krb5-strength section of [appdefaults] in krb5.conf.
232 New boolean settings require_ascii_printable and require_non_letter
233 are supported in the krb5-strength setting of [appdefaults] in
234 krb5.conf. The former rejects passwords containing characters other
235 than printable ASCII characters (including space), and the latter
236 requires that passwords contain at least one character that is not a
237 letter (upper or lower case) or a space.
239 The plugin can now be configured without a dictionary, in which case
240 only checks for a password based on the principal and the simpler
241 checks available through the new configuration variables are done.
242 This mode is mostly useful for testing, since such simple checking can
243 more easily be done via less complex password strength configurations.
245 The check for passwords based on the principal now check for passwords
246 formed by reversing or adding numbers before and after each separate
247 component of the principal. This will catch passwords based on the
248 realm or components of the realm, which will often catch passwords
249 based on the name of the local institution.
251 The plugin now sets the Kerberos error message in the context to pass
252 error information, resulting in higher-quality error reporting in the
255 CrackLib checks for passwords where a character is a simple increment
256 or decrement of the previous character. In previous versions, the
257 embedded version of CrackLib allowed at most four such occurrences in
258 the entire password. This results in false positives on long
259 passphrases, since such accidental letter relationships aren't
260 uncommon in human languages. Change the embedded CrackLib to allow
261 one such simple increment for every three characters in the password,
262 which tightens the check somewhat for shorter passwords and loosens it
263 considerably for longer passwords.
265 Expect the Heimdal password strength checking plugin header in
266 kadm5/kadm5-pwcheck.h instead of outside of the kadm5 directory. This
267 is the path used by current versions of Heimdal. Drop support for
268 older versions of Heimdal that don't install this header file.
270 Update to rra-c-util 4.9:
272 * Probe for Kerberos headers using file checks instead of compiles.
273 * Improve probe for the Heimdal libroken library.
274 * Always build with large file support.
275 * Conditionally call AM_PROG_AR for portability to new Autotools.
277 Update to C TAP Harness 2.2:
279 * Allow more easily running single programs under tests/runtests.
280 * Flush the output from the test harness after each test.
282 krb5-strength 1.1 (2012-05-11)
284 Change the minimum password length in the embedded CrackLib to 8.
286 Reject passwords formed from the username portion of the principal
287 with digits appended.
289 In the embedded CrackLib, also check for a duplicated dictionary word.
291 Support linking with the system CrackLib instead of the embedded and
292 stricter copy by passing --with-cracklib to configure.
294 Fix variable sizes in the embedded CrackLib on 64-bit platforms. This
295 may fix interoperability problems with databases created on platforms
296 with a different native integer size. Thanks, Karl Lehnberger and
299 Stop using local in the test suite for portability to Solaris /bin/sh.
301 Update to rra-c-util 4.4:
303 * Use PATH_KRB5_CONFIG to override krb5-config location.
304 * Fix probing for ibm_svc/krb5_svc.h on AIX.
305 * Support Heimdal libraries without libroken, like OpenBSD.
306 * Fix manual Kerberos library probing without transitive dependencies.
307 * Support systems that only have krb5/krb5.h.
308 * Pass --deps to krb5-config in the non-reduced-dependencies case.
309 * Silence __attribute__ warnings on more compilers.
310 * Update warning flags for make warnings.
311 * Flesh out MAINTCLEANFILES to remove autogen results.
312 * Add notices to all files copied from rra-c-util.
314 Update to C TAP Harness 1.12:
316 * Drop is_double from the C TAP library to avoid requiring -lm.
317 * Avoid using local in the shell libtap.sh library.
318 * Silence __attribute__ warnings on more compilers.
319 * runtests now frees all allocated resources on exit.
320 * Fix runtests to still honor SOURCE and -s without BUILD and -b.
321 * Add tests/HOWTO documenting how to add new tests.
322 * Ensure correct output ordering in test results.
323 * Add -h and a better usage message to tests/runtests.
325 krb5-strength 1.0 (2010-02-16)
327 Add heimdal-strength, a program that checks password strength using
328 the protocol for a Heimdal external check program.
330 The shared module now also exports the interface expected by Heimdal's
331 dynamically loaded password strength checking API and can be used as a
332 Heimdal kadmin plugin.
334 Add a new plugin API for MIT Kerberos modelled after the plugin API
335 used for other MIT Kerberos plugins. Thanks to Marcus Watts for
336 substantial research and contributions to the interface design. This
337 work is incomplete in this release, missing the corresponding patch to
340 Fixed the data format written by the included packer program to add
341 enough nul bytes at the end of the data. Previously, there was not
342 enough trailing nul bytes for the expected input format, leading to
343 uninitialized memory reads in the password lookup.
345 Add a test suite using the driver and library from C TAP Harness 1.1.
347 Add portability code for platforms without a working snprintf or other
348 deficiencies and updated the code to take advantage of those
351 krb5-strength 0.5 (2007-07-18)
353 The check of the password against the principal checked against the
354 fully-qualified principal, which is not the usual problem.
355 Additionally check that the password doesn't match the principal with
356 the realm removed or the reverse of that (case-insensitive).
358 krb5-strength 0.4 (2007-03-28)
360 The patches directory was omitted from the distribution. Really
363 krb5-strength 0.3 (2007-03-23)
365 Initial public release. Includes a patch for MIT Kerberos, a slightly
366 modified version of CrackLib, and glue wrapped around CrackLib to make