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Revision 2783 - (show annotations) (download)
Thu Apr 30 10:44:41 2015 UTC (6 years, 6 months ago) by davidg
File size: 18098 byte(s)
Added compensatory controls for broken cache-control/expires headers from CDNs

1 ==============================================================================
2 CHANGES to fetch-crl - the Certificate Revocation List retrieval tool
3 ==============================================================================
4 The fetch-crl utility will retrieve certificate revocation lists (CRLs) for
5 a set of installed trust anchors, based on crl_url files or IGTF-style info
6 files. It will install these for use with OpenSSL, NSS or third-party tools.
7
8 Changes in 3.0.16-1
9 ----------------------
10 * Added cache state freshness constraints (default maxcachetime set to 96hrs)
11 * Re-set cache expiry of state data if CRL nextUpdate is within or beyond
12 7 hrs (config "expirestolerance") claimed URL Expiry or Cache-control max-age
13
14 Changes in 3.0.15-1
15 ----------------------
16 * Fixed issues resulting in undefined attribute values to be returned for CRL
17
18 Changes in 3.0.14-1
19 ----------------------
20 * Requesting CRL retrieval for an empty trust anchor store is now a warning
21 and no longer an error
22
23 Changes in 3.0.13-1
24 ----------------------
25 * Supplied system init script for boot phase will not re-run inadvertently
26 * Add rcmode config option (added differentiated reporting and success-on-
27 solely-retrieval-errors)
28 * Add --define key=val command line argument to augment configuration data
29 * Setting FETCHCRL_OPTIONS in /etc/sysconfig/fetch-crl will add these
30 options to the commandline of fetch-crl on start from cron or at boot time
31 Setting FETCHCRL_BOOT_OPTIONS adds them to the boot init script only
32 (e.g. FETCHCRLBOOTOPTIONS="--define rcmode=differentiated")
33 and FETCHCRL_CRON_OPTIONS does the same only for the cron job script
34
35 Changes in 3.0.12-1
36 ----------------------
37 * PEM formatted CRLs now always include a final newline character (fix
38 provided by Harald Barth <haba@kth.se>)
39
40 Changes in 3.0.11-1
41 ----------------------
42 * Added reference to /etc/fetch-crl.d/ to the man page, used shortened URL
43 to full documentation in man page
44 * Added version information to help output and added -V option
45 * Added a dangerous clean-crl script to remove stale .r* files (beware!)
46
47 Changes in 3.0.10-1
48 ----------------------
49 * Added a "noquiet" option in the configuration file that will override
50 the default single "-q" option in the cro-job that is shipped with
51 the fetch-crl3 init scripts (feature request by Ryan Taylor)
52 * Added option "--inet6glue" and "inet6glue" config setting to load
53 the Net::INET6Glue perl module (if it is available) to use IPv6
54 connections in LWP to download CRLs
55
56 Changes in 3.0.8-1
57 ----------------------
58 * Trust anchor name inferrence based on retrieved-CRL added as option (at cost
59 of retrieving CRL even if there is no accompanying trust anchor found later)
60 Option is disabled by default, but can be enabled by using @HASH@ in the
61 ca-template name list. (feature request by Rob van der Wal, SARA, NL)
62
63 Changes in 3.0.7-1
64 ----------------------
65 * CRL modofication time heuristic inadvertently modified file name templates
66 (solves issue kindly reported by Elan Ruusamae)
67 * Expanded representation of tokenisation characters in strings to work
68 around bug in file(1) (rhbz#699546, works around RedHat Bugzilla 699548)
69
70 Changes in 3.0.6-1
71 ----------------------
72 * Response parsing disabled to suppress superfluous warning on unexpected
73 UTF-8 respons when retrieving a CRL (solves RedHat Bugzilla 688902)
74
75 Changes in 3.0.5-1
76 ----------------------
77 * CRLs for multiple similarly-named trust anchors might not all be downloaded.
78 This is fixed in this release.
79 * Spurious "restoreLogMode" internal errors are no longer raised
80
81 Changes in 3.0.4-1
82 ----------------------
83 * Add support for directory based drop-in configuration in /etc/fetch-crl.d/
84 * Only use cached CRL contents if the nextUpdate time of the cached CRL is
85 still in the future. This will ensure that a new download is attempted
86 each and everytime for CRLs that have already expired.
87
88 Changes in 3.0.3-1
89 ----------------------
90 * Clean up of man page format macro PU (reported by Mattias Ellert)
91
92 Changes in 3.0.2-1
93 ----------------------
94 * Clean up of man page format macro PU (reported by Mattias Ellert)
95
96 Changes in 3.0.1-1
97 ----------------------
98 * hunts through more places to find the latest successful CRL download to
99 set the latest local modification time for a CRL
100 (resolves a comparison error in case output and infodir are unset)
101
102 Changes in 3.0.0-0.RC4
103 ----------------------
104 * the config file name has changed to fetch-crl.conf, although a
105 fetch-crl.cnf file will also be used when present
106 * symlinked meta-data files can be ignored with the --nosymlinks option
107 (or nosymlinks in the configuration file). This allows fetch-crl to be
108 used effectively with new-format IGTF distribution before 1.37
109 * infinite loop for non-indexed CA file names fixed
110
111 Changes in fetch-crl 3.0
112 ------------------------
113 * fetch-crl 3.0 is a complete re-write, and shares no code with the 1.x and
114 2.x series utility of the same name, although the function and some of
115 the syntax is obviously the same
116
117 * support for multiple output formats: OpenSSL 1 in dual-hash mode, specific
118 DER and PEM outputs, and NSS databases
119 * support for multiple CRLs for a single CA, allowing more than one CA with
120 the same subject name but different CLRs. Review your client software to see
121 if and how these CRLs are used.
122 * stateful retrieval helps reduce bandwidth usage by caching the CRLs locally
123 and respecting the Cache Control headers sent by the web server hosting the
124 CRL. This can reduce the number of downloads
125 * support for HEAD-only requests when state preservation is used (initially
126 only retrieve HTTP headers, and only if the CRL actually changed to a full
127 download)
128 * support for more CRL retrieval protocols (file:// and ftp://)
129 * ability to try site-local URLs first, before relying on the URLs shipped with
130 the trust anchor. This allows building an explicit local caching (web) server.
131 * ability to specify additional URLs to try in case the URLs shipped with the
132 trust anchor were not responsive. This allows for automatic fall-back to
133 (local or global) mirror services for CRL downloads
134 * warnings and errors can be suppressed on a per-trust anchor basis, to allow
135 silencing for particularly unstable trust anchors
136 * aging tolerance (the delay time before errors are generated in case downloads
137 consistently fail) can be configured on a per-trust anchor basis
138 * parallel downloading for multiple trust anchors
139 * minimized use of temporary files in the file system (now limited to the
140 invocation of OpenSSL only, and only for brief periods of time)
141 * dependencies on wget, lynx and other unix utilities have been removed
142 * explicit web proxy support (using LWP http proxies)
143 * completely re-written in perl, with some (hopefully minimal) dependencies:
144 LWP, Sys::Syslog, POSIX. And Data::Dumper (when debugging is enabled),
145 and IO::Select (if parallel downloads are enabled).
146
147 Differences with respect to the previous versions
148
149 * when downloading CRLs via https, the server certificate is not checked,
150 neither for the correct DNS name nor for being issued by a valid CA. Since
151 the CRL in itself is signed, this is not a security vulnerability. If
152 stricter checking is anyway desired, and the Crypt::SSLeay perl module has
153 been installed, set the HTTPS_CA_FILE environment variable before invoking
154 fetch-crl -- but keep in mind that the DNS name verification is limited
155 and will (incorrectly) reject DNS names if these are listed only in the
156 subjectAlternativeName of the server certificate
157 * Existing files with a name that matches a CRL target name are overwritten,
158 even if they did not originally contain CRL data. In v2 this was configurable
159 via the FORCE_OVERWRITE configuration setting. In version 3, files are
160 overwritten by default, and this can no longer be configured.
161 * fetch-crl3 will no longer check CA certificates for consistency or validity
162 by themselves, only retrieved CRLs are verified
163
164 Downsides of the new version
165
166 * it requires perl5 to be installed (tested with perl 5.8.0 and higher) with
167 libwww-perl, whereas version 2 only required a traditional Bourne shell
168 * requires a version of OpenSSL (0.9.5a or better) to be installed. Needs
169 OpenSSL 1.0.0 (at least beta5) for dual-hash support.
170 * when using parallel downloads, it can only run on pure-POSIX systems
171 * parallelism in combination with the NSS database output format is not tested
172 * Even when only the NSS database output format has been selected, OpenSSL is
173 still needed for verification and processing
174
175
176 ==============================================================================
177
178 The change log below applies to the 1.x and 2.x series fetch-crl and is
179 included for historical purposes only. Fetch-crl3, with which this
180 changes file is being shipped, is a complete re-write of the utility.
181 Although a lot of backwards compatibility has been preserves, there have
182 been significant changes and the information below should NOT be used
183 to infer any behaviour of fetch-crl3.
184
185 Fetch-crl 1.x and 2.x were released under the EU DataGrid License.
186
187 Changes in version EGP 2.8.5
188 ----------------------------
189 (2010.06.03)
190
191 * fetch-crl was occasionally leaving behind {hash}.r0.XXXXXX.r0 files
192 This has been fixed in this release (patch thanks to Jason Smith, BNL)
193 * man page was not compliant to Debian guidelines, this has been fixed
194 (patch thanks to Mattias Ellert, Uppsala University)
195
196 Changes in version EGP 2.8.4
197 ----------------------------
198 (2010.04.04)
199
200 * Fixes error when randomWait is not set [RH Bug 579488]
201
202 Changes in version EGP 2.8.3
203 ----------------------------
204 (2010.03.28)
205
206 * Preserve SELinux context for CRL files if SElinux status program exists
207 and selinux is enabled (RH bug 577403)
208 * Fix argument parsing on syslog facility specification (RH bug 577387)
209 * Increase granularity of the RandomWait and allow for 0 in -r option
210
211 Changes in version EGP 2.8.2
212 ----------------------------
213 (2010.03.03)
214
215 * Improved support for multiple CRL URLs by downloading until a success
216 is achieved, instead of downloading all of them
217 * Imported randomwait patch from Steve Traylen
218
219 Changes in version EGP 2.8.1
220 ----------------------------
221 (2010.01.26)
222
223 * The installed CRL file is re-checked for validity to catch file system
224 errors and local disk corruption. When possible, it will try to restore
225 a backup copy. Failures are not subject to aging tolerance.
226
227 Changes in version EGP 2.8.0
228 ----------------------------
229 (2009.09.22)
230
231 * The RPM packaging has been overhauled and is now sufficiently conformant
232 to EPEL and FedoraProject guidelines.
233 * New init scripts and a cron job entry have been added to allow management
234 of fetch-crl via the chkconfig mechanism
235
236 These changes were contributed by Steve Traylen (CERN, Geneva, CH).
237
238 Changes in version EGP 2.7.0
239 ----------------------------
240 (2009.01.25)
241
242 * Warnings and errors are now counted. If there are errors in the download
243 or verification process for one or more CRLs, the exit status will be 1;
244 if there are errors in the local setup or in the script invocation, the
245 exit status will be 2.
246 * The installed CRLs no longer have the textual representation of the CRL,
247 but only the PEM data blob, thus reducing IO and memory requirements.
248 * the CRL aging threshold is now set by default to 24 hours. The previous
249 default was 0. The CRL aging threshold is set in the config file using
250 CRL_AGING_THRESHOLD=<xx>, or with the "-a" command-line argument.
251 * Default network timeouts reduced to 10 seconds (was 30) and retries to 2
252 * Added caching and conditional downloading. When CACHEDIR is set, the
253 original downloads are preserved and wget timestamping mode enabled.
254 When the content did not change, only the timestamp on the installed
255 CRL is updated. If SLOPPYCRLHASHES is set, the has is calculated based
256 on the name of the crl_url file, otherwise it is taken from the CRL itself.
257 - The CACHEDIR must be exclusively writable by the user running fetch-crl
258 - Setting CACHEDIR significantly reduced the bandwidth used by fetch-crl
259 * Added RESETPATHMODE setting in sysconfig. It defines whether or not to
260 set re-set $PATH to "/bin:/usr/bin" before start. The search for OpenSSL
261 may be done based on the old path.
262 yes=always replace; searchopenssl=search for openssl first and then reset;
263 no=keep original path, whatever that me be (may be empty if called from cron)
264 Default="yes". This replaces the hard-coded path in the tool!
265 * Hidden "FORCE_OVERWRITE" option now has a regular name. This is backwards-
266 compatible. Set FORCE_OVERWRITE=yes if you want files overwritten that
267 have a CRL-like name and ought to have CRL content, but currently do not.
268 * Addresses gLite Savannah bugs 28418 and 29559. Bug 27023 is partially
269 addressed. Bug 20062 can be remedied with WGET_OPTS arguments.
270 Addresses OSG ticket 4673.
271
272 Changes in version EGP 2.6.6
273 ----------------------------
274 (2007.09.16)
275 (version 2.5.5 is invalid and was not publicly released)
276
277 * Added obscure configuration parameter to allow overwriting of
278 arbitrary data files with a downloaded CRL (on request of
279 CERN, see https://savannah.cern.ch/bugs/index.php?29559)
280
281 Changes in version EGP 2.6.4
282 ----------------------------
283 (2007.08.15)
284
285 * Expired CA issuer certificate now gives a warning instead of an error
286 with the full verification result message
287 * additional logfile output target can be selected via the configuration file
288 * CRL aging threshold documented in manual page. Errors will now also be
289 generated in the CRL download failed consistently and the current CRL
290 has already expired
291
292 Changes in version EGP 2.6.3
293 ----------------------------
294 (2006.11.13)
295
296 * cron job example: fetch-crl invocation syntax error corrected
297
298 Changes in version EGP 2.6.2
299 ----------------------------
300 (2006.10.27)
301
302 * fixed bug: older wget versions do not recognise --no-check-certificate
303
304 Changes in version EGP 2.6.1
305 ----------------------------
306 (2006.10.25)
307
308 * fixed local timezone vs UTC error in LastUpdate CRL validation comparison
309 * fixed time comparison is the one-hour LastUpdate/download tolerance
310 (both fixes thanks to Alain Roy)
311 * added support for directory names containing whitespace
312 * added support for syslog reporting (via -f option or SYSLOGFACILITY directive)
313 * SERVERCERTCHECK=no is now the default. It can be reset via the configuration
314 file, or using the "--check-server-certificate" commandline option
315 * the main configuration file location (formerly fixed to be
316 /etc/sysconfig/fetch-crl) can now be set via the variable $FETCH_CRL_SYSCONFIG
317 * logfile format timestamp and tag have been normalised
318
319 Changes in version EGP 2.6
320 --------------------------
321 (2006.05.20)
322
323 * if the current local CRL has a lastUpdate time in the future, and the
324 newly downloaded CRL is older that the current one, allow the installation
325 of the newly downloaded CRL and issue a warning.
326 * added non-suppressable warning in case the newly downloaded CRL has a
327 lastUpdate time in the future, but install that CRL anyway (as the local
328 clock might have been wrong).
329
330 Changes in version EGP 2.5
331 --------------------------
332 (2006.01.16)
333
334 * added additional configuration arguments and configuration variables
335 to skip the server certificate check in wget
336 (to support https:// URLs where the server is authenticated with
337 a certificate that is not part of it's own trusted domain, such as
338 the KISTI URL)
339
340 Changes in version EGP 2.4
341 --------------------------
342 (2005.11.15)
343
344 * for those platforms that support the stat(1) command, and in case the
345 .crl_url file is named after the hash of the crl subject name to download,
346 error eporting for individual download errors can be suppressed for
347 a configurable amount of time as set via the "-a" option (unit: hours).
348
349 Changes in version EGP 2.3
350 --------------------------
351 (2005.11.05)
352
353 * do not replace recent CRLs with ones that have an older lastUpdate
354 timestamp (prevents ARP/DNS DoS attacks)
355
356 Changes in version EGP 2.2
357 --------------------------
358 (2005.10.27)
359
360 * secure http download by wget recognise the CAs in the trusted directory.
361 solves the issue described in the LCG bug tracking system
362 https://savannah.cern.ch/bugs/index.php?func=detailitem&item_id=12182
363
364 Changes in version EGP 2.1
365 --------------------------
366 (2005.08.12)
367 * specifically look for the most recent version of OpenSSL. The
368 one in GLOBUS_LOCATION (which used to take precedence in the
369 previous releases) is outdated in many cases and caused
370 troubles on the LCG production systems in validating v2 CRLs
371 * added manual page fetch-crl(8)
372
373 Changes in version EGP 2.0
374 --------------------------
375 (2005.02.28)
376 * name of the installed script changed to "fetch-crl"
377 * the cronjob script is no longer installed by default, but supplied
378 as an example in the %doc directory
379 * RPM is now relocatable (default install in /usr)
380 * READMA and CHANGES file now inclued in %doc tree
381 * make install now installs
382 * version increased to 2.0
383
384 Changes in version EGP 1.9
385 --------------------------
386 (2005.02.24)
387 * the content of the final target CRL file is now checked for
388 containing a valid CRL if it already exists. If it does not
389 contain a CRL, an error is displayed and the file left untouched
390 So making the final ".r0" file in ${outdir} a link to something else
391 will not work, preventing an escalation in the final stage.
392
393 Changes in version EGP 1.8
394 --------------------------
395 (changes from Fabio's version 1.7, 2005.02.24)
396
397 * All temporary files (the initial CRL download using wget
398 and the PEM-converted version of that file) are now created using
399 mktemp
400 * the RetrieveFileByURL function will not overwrite files that
401 have any data in them
402 * Note that the script can be run by a non-priviledged user, but
403 that the output directory must be made writable by that user
404 in an out-of-band way.
405
406 EDG version 1.7
407 ---------------
408 Imported with consent of Fabio Hernandez and Steve Traylen from
409 the original EDG repository.
410 The EU DataGrid License applies, see http://www.eu-datagrid.org/

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