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Diffstat (limited to 'TLS_CHANGES')
| -rw-r--r-- | TLS_CHANGES | 2418 |
1 files changed, 2418 insertions, 0 deletions
diff --git a/TLS_CHANGES b/TLS_CHANGES new file mode 100644 index 0000000..1abe0ff --- /dev/null +++ b/TLS_CHANGES @@ -0,0 +1,2418 @@ +2004/09/12 == Released 0.8.19 == + +2004/09/01 + - Finished updating the code by adjusting to postfix-2.2-20040829 + and started using it at my own site. + +2004/08/01 + - Started adjusting the patch to postfix-2.2-20040729. + +2004/06/21 == Re-released 0.8.18 == + +2004/06/21 + - Postfix 2.1.3 has been released. Shortlived 2.1.2 did bring an + incompatibel change (patch conflict) which has been resolved. + - Fixed some typos in the tlsmgr.8 manual page (Chris Pepper + <pepper@reppep.com>). + +2004/04/27 == Re-released 0.8.18 == + +2004/04/27 + - Postfix 2.1.0 has been released. Some minor patch conflicts with respect + to the actual code and build environment. + - Due to the restructuring of the documentation the old sample-*.cf + files are no longer available. + Took documentation already adopted by Wietse for the 2.1-RC2-IPV6+TLS + snapshot. + +2004/02/09 == Re-released 0.8.18 == + +2004/02/09 + - Postfix 2.0.18-20040205 is available, patchkit applies without + problems. + +2004/02/02 == Release 0.8.18 == + +2004/02/02 + - Incorporated Luca Berra's information into the patchkit and ran tests + with my own versions. + +2004/02/01 + - Reports about server side SMTP failure with Carsten's patch can be + found on postfix-users. + 'Luca Berra' <bluca@comedia.it> informs, that he discoverd another + failure of the GNU patch program with a misplaced patch hunk in + smtpd.c + +2004/01/30 + - Edited in additional #ifdef USE_TLS conditionals. If the TLS patch + is applied but not activated (USE_TLS is not defined), a warning is + printed as soon as TLS shall be used. + +2004/01/23 + - Postfix 2.0.18-20040122 is now available. Several patch conflicts occur. + Even more: one hunk of the patch (which is provided in unified diff) + fails in smtp.c and causes a segmentation violation. + Carsten Hoeger <choeger@suse.de> provides an adapted patch kit. + +2004/01/02 == Released 0.8.17 == + +2004/01/02 + - Postfix-2.0.16-20031231 is released. No patch conflicts. + - Changed autoresponder for TLS tests to "The Postfix Book" echo + responder (provided by Patrick Koetter and Ralf Hildebrandt). + +2003/12/30 + - Postfix-2.0.16-20031226 is released. No patch conflicts. + +2003/12/26 + - Postfix-2.0.16-20031224 is released. Resolved patch conflicts. + +2003/12/16 + - Postfix-2.0.16-20031215 is released. Resolved patch conflicts. + - src/global/pfixtls.c: changed occurance of "ssize_t" to "size_t" + as some quite old operating systems do no have ssize_t + (Reported by Klaus Jaehne <kj@uue.org> for SunOS 4.1.4). + - src/global/pfixtls.c: both the client and the server engine did + print out messages even when tls_loglevel was set to 0 (reported + by Florian Effenberger <florian@effenberger.org>): evaluate loglevel + before printing any message. + +2003/11/17 == Re-released 0.8.16 == + +2003/11/17 + - Postfix 2.0.16-20031113 is released. Some minor patch conflicts. + +2003/10/27 == Re-released 0.8.16 == + +2003/10/24 + - Postfix 2.0.16-20031022 is released. Some minor patch conflicts. + +2003/09/23 == Re-released 0.8.16 == + +2003/09/23 + - Postfix 2.0.16 and 2.0.16-20030921 are now available. + Resolved some minor patch conflicts. + +2003/09/10 == Released 0.8.16 == + +2003/09/09 + - Postfix 2.0.15 has been released including another workaround for + select() on Solaris problems. It contains additional code to catch + EAGAIN on read() in the timed_read() routine (and the respective + precautions in timed_write() + - Note: this fix is not yet part of Postfix 2.0.14-20030812. + - Added corresponding code to pfixtls_timed_read()/_write(). + - Changed SSL wrappermode behaviour: use smtpd_sasl_tls_security_options + instead of smtpd_sasl_security_options as is to be expected because TLS + is active. (Bug reported by Bob Snyder <rsnyder@toontown.erial.nj.us>.) + +2003/08/29 == Re-released 0.8.15 == + +2003/08/29 + - Adapted patchkit to Postfix 2.0.14. No patch conflicts. + +2003/07/17 == Re-released 0.8.15a (-20030715 only) == + +2003/07/16 + - Experimental version Postfix 2.0.14-20030715 is released, including + the SASL changes. Resolved some minor patch conflicts. + +2003/07/11 == Released 0.8.15a (-20030706 only) == + +2003/07/11 + - Received error report about about TLS failing with the new smtpd_proxy + feature including instructions on how to reproduce. + (Did receive an earlier report on 2003/07/09, that however indicated other + setup problems, so that the actual problem was not visible.) + - Analysis: when introducing the new smtpd_proxy feature, different mechnisms + where introduced to either write to the cleanup daemon (as before) or to + the smtpd_proxy connection. Functions and streams are now expressed in + out_fprintf() function pointers etc. being assigned accordingly. + When updating to 0.8.15/2.0.13-20030706 this change was missed and the + routine adding the TLS information to the Received: headers did use the + older rec_fprintf() functions etc. This did work fine for the traditional + connection to the cleanup service, but naturally failed for smtpd_proxy + (with a segmentation violation). + Solution: access out_stream via the according pointers. + - The 2.0.13 stable version is not affected. + +2003/07/08 == Released 0.8.15 == + +2003/07/07 + - Postfix 2.0.13 and 2.0.13-20030706 are released. + Patchkit for 2.0.13 applies cleanly. + Patchkit for 2.0.13-20030607 requires several adaptations (patch conflicts, + no functional changes). + - Slightly modified SASL interface code (smpt[d]_sasl_glue layer) to + allow setting the security policy during session setup instead of + process start. This allows to actually choose SASL mechanisms available + depending on the availability of TLS encryption and authentication. + New parameters: smtpd_sasl_tls_security_options, + smtp_sasl_tls_security_options, smtp_sasl_tls_verified_security_options + - Submitted change to SASL interface to Wietse, who accepted the change + as part of the Snapshot line. + +2003/06/19 == Released 0.8.14 == + +2003/06/19 + - Add support for SubjectAlternativeName "dNSName" entries in certificate + checking (applies for client mode only). + If the client connects to the server, it does check the list of dNSName + entries against the expected hostname (therefore allowing the server to + have multiple identities). As described in RFC2818 (HTTP over TLS), + CommonName (CN) entries are only checked, if no dNSName entries are found + at all. + Initial patch proposed by Deti Fliegl <fliegl@cs.tum.edu>, reworked to + follow the RFC2818 rules and some cleanup. + +2003/06/18 + - Checked out similar settings, found another missing entry: + var_smtp_scert_vd was missing src/smtp/smtp.c. + - Renamed HAS_SSL to USE_TLS for compilation (have to use -DUSE_SSL + in the future). Currently pfixtls.h will take care of setting + USE_TLS, when HAS_SSL has been defined. + +2003/06/17 + - Received bug reports about Postfix/TLS failing (connection closing) + after having finished the "STARTTLS"/"220 Ready to start TLS" + dialogue. (Actually the first report came in via private mail on + 2003/06/12, but the information was too diffuse to track down). + Tracking down became possible after it became clear, that only Solaris + systems are affected. + Analysis: + * As of 2003/06/09 postfix uses non-blocking socket I/O for the SMTP + connection on Solaris platforms. This requires using "select()" style + waiting before read() or write() access (which are not prepared EAGAIN + or EWOULDBLOCK in the Postfix case and therefore indicate error). + * As the var_smtpd_starttls_tmout variable is not correctly initialized + (value is 0), the select() style function is not called, therefore + read() fails with EAGAIN and the connection is closed due to a + presumed error condition. + * The initialization of the variable should be done in the time_table[] + list during main(). + The entry however was lost during the patch adaptation from 0.7.13e + to 0.7.14-snap20020107 on 2002/01/07. + Impact: + * On Solaris systems, STARTTLS fails during handshake (server only). + * On other systems, the TLS negotiation phase is not protected by the + smtpd_starttls_tmout (default 300s) value and may hang until the + watchdog kills smtpd, if the client does not continue the handshake. + Restored var_smtpd_starttls_tmout variable initialization. + +2003/06/12 == Re-released 0.8.13 == + +2003/06/11 + - Adapted to snapshot 2.0.12-20030611. No patch conflicts. + +2003/06/11 + - Adapted to snapshot 2.0.11-20030609. One minor patch conflict. + +2003/05/23 == Re-released 0.8.13 == + +2003/05/23 + - First release against snapshot 2.0.10-20030523. + +2003/04/26 == Re-released 0.8.13 == + +2003/04/26 + - Updated patchkit to apply to Postfix 2.0.9. + - Updated patchkit-name to reflect the release of OpenSSL 0.9.7b. + +2003/03/06 == Re-released 0.8.13 == + +2003/03/06 + - Postfix 2.0.6 has been released. No patch conflicts. + +2003/03/02 == Re-released 0.8.13 == + +2003/03/02 + - Postfix 2.0.4 has been released. "patch" should work with some warnings + about moved line numbers. + - OpenSSL 0.9.7a has been released. No visible changes with respect to + Postfix/TLS. + +2003/01/26 == Re-released 0.8.13 == + +2003/01/26 + - Postfix 2.0.3 has been released. One minor patch-conflict. + +2003/01/13 == Released 0.8.13 == + +2003/01/13 + - Postfix 2.0.1 has been released. Some minor patch conflicts resolved. + - Added HOWTO documents contributed by Justin Davies <justin@palmcoder.net> + to the contribution area. + - Added RFC3207 (SMTP Service Extension for Secure SMTP over Transport Layer + Security) to the documentation. RFC3207 is the successor of RFC2487. + - Updated TODO list to reflect release ideas up to the release of + Postfix/TLS 0.9.0. (Or will it finally be 1.0.0? :-) + +2002/12/30 + - OpenSSL 0.9.7 has been released. Postfix/TLS works best with the new + 0.9.7 release. + +2002/12/24 == Re-released 0.8.12 == + +2002/12/24 + - Postfix 2.0.0.1 has been released. Resolved one minor patch conflict. + +2002/12/20 == Re-released 0.8.12 == + +2002/12/20 + - Postfix snapshot 1.1.12-20021214 has been released. Resolved minor + patch conflicts. + +2002/12/15 == Re-released 0.8.12 == + +2002/12/15 + - Postfix snapshot 1.1.12-20021214 has been released. Two minor patch + conflicts. + +2002/12/06 == Released 0.8.12 == + +2002/12/06 + - OpenSSL 0.9.6h has been released. Update documentation and filenames + to reflect this new release. + - Minor bug fix: when calling "sendmail -bs", smtpd is not run with + superuser permissions, therefore the loading of the private key fails. + STARTTLS is not used anyway, so the key is not needed anyway, but the + failure to load creates a misleading warning. + Do not initialize TLS engine at all when not started with superuser + permissions. + +2002/12/03 + - Postfix snapshot 1.1.12-20021203 has been released. Resolved one patch + conflict. + +2002/11/01 == Re-released 0.8.11a == + +2002/11/01 + - Postfix snapshot 1.1.11-20021031 has been released. No patch conflicts. + +2002/10/30 == Re-released 0.8.11a == + +2002/10/30 + - Postfix snapshot 1.1.11-20021029 has been released. No patch conflicts. + +2002/09/30 == Re-released 0.8.11a == + +2002/09/30 + - Postfix snapshot 1.1.11-20020928 has been released. No patch conflices. + +2002/09/24 + - Postfix snapshot 1.1.11-20020923 has been released. Adapt patchkit. + +2002/09/19 == Re-released 0.8.11a == + +2002/09/18 + - Postfix snapshot 1.1.11-20020917 has been released. Adapt patchkit. + +2002/08/23 == Re-released 0.8.11a == + +2002/08/23 + - Postfix snapshot 1.1.11-20020822 has been released. Adapt patchkit. + +2002/08/20 + - Postfix snapshot 1.1.11-20020819 has been released with several + enhancements and changes. Adapt patchkit (minor issues). + +2002/08/12 + - OpenSSL has experienced several (security critical) updates. + +2002/07/26 == Re-released 0.8.11a == + +2002/07/26 + - On popular demand, a new diff for the snapshot version of Postfix + is created: postfix-1.1.11-20020719. + +2002/06/18 == Re-released 0.8.11a == + +2002/06/18 + - On popular demand, a new diff for the snapshot versions of Postfix + is created: postfix-1.1.11-20020613. + +2002/06/03 == Released 0.8.11a == + +2002/06/03 + - When compiling with SSL but without SASL, compilation fails due to + the modification of state->sasl_mechanism_list that is not part of the + "state" structure when SASL is not compiled in. + This bug was introduced in version 0.8.11. + Bug reported and patch supplied by Bernd Matthes + <bernd.matthes@gemplus.com>. + +2002/05/29 == Released 0.8.11 == + +2002/05/29 + - Postfix 1.1.11 is released. + +2002/05/25 + - Fix processing of options after STARTTLS handshaking: AUTH= was not + handled, as the "=" was not recognized as for the extension list for + the case without TLS. (The TLS case was a copy of an older version + of the code not yet containing the "=" and the change in the main + code slipped through without noting the difference, hence the option + as not added to the TLS part. + Found by "Christoph Vogel" <Christoph.Vogel@Corbach.de>. + +2002/05/24 + - Bug reported by "Christoph Vogel" <Christoph.Vogel@Corbach.de>: + Client side AUTH does not work, if STARTTLS is used: if a server + announces AUTH and STARTTLS, AUTH is being used if TLS is disabled. + Once TLS is enabled, AUTH is still offered by the server, but the + client does not use it any longer. + Reason: when AUTH is offered, not only the SMTP_REATURE_AUTH flag + is set in state->features, but also the available mechanisms are + remembered in state->sasl_mechanism_list. As AUTH may be offered + twice by some hosts (in the correct "AUTH mech" form and the older + and deprecated "AUTH=mech" form), a check against processing the + line twice is included in smtp_sasl_helo_auth(). This check now + prevented the correct processing in the second evaluation of the + ESMTP extensions offered after the STARTTLS activation. + Solution: reset state->sasl_mechanism_list before processing the + extension list just like state->features. + +2002/05/15 == Released 0.8.10 == + +2002/05/15 + - Postfix 1.1.10 has been released. No changes. + +2002/05/14 == Released 0.8.9 == + +2002/05/14 + - Postfix 1.1.9 has been released. Patchkit requires a small adjustment + (supplied by Tuomo Soini <tis@foobar.fi>). + +2002/05/10 == Released 0.8.8 == + +2002/05/10 + - OpenSSL 0.9.6d has been released. Release the unchanged patchkit + with a new version number and under a new filename to indicate + that it should be built against 0.9.6d (it has the session caching + failure of 0.9.6c fixed). Update documentation accordingly. + +2002/05/05 + - Postfix 1.1.8 has been released, the patchkit applies cleanly. + +2002/04/03 == Re-released 0.8.7 == + +2002/04/03 + - Postfix 1.1.7 has been released, the patchkit applies cleanly. + Re-released the patchkit. + +2002/03/29 == Released 0.8.7 == + +2002/03/29 + - Postfix/TLS did not honor the per-recipient-switching-off in SMTP + client mode via tls_per_site (per-host-switching off was honored). + Patch by Will Day <wd@hpgx.net>. + +2002/03/27 == Released 0.8.6 == + +2002/03/27 + - Postfix 1.1.6 has been released. Adapted patchkit to resolve minor + patch conflict. (Template provided by Simon Matter + <simon.matter@ch.sauter-bc.com>) + +2002/03/13 == Released 0.8.5 == + +2002/03/13 + - Postfix 1.1.5 has been released. The patchkit would apply cleanly, but + obviously the "lock_fd" change that applies to dict_dbm.c (Wietse) + also has to be applied to dict_sdbm.c. Tuomo Soini <tis@foobar.fi> + kindly provided this change. + +2002/02/25 == Released 0.8.4 == + +2002/02/25 + - Postfix 1.1.4 became visible. One patch conflict in a Makefile + (Carsten Hoeger <choeger@suse.de>). + +2002/02/21 + - Dates in this CHANGES document were showing 2001 even though 2002 already + began :-). Fixed. (Marvin Solomon <solomon@conceptshopping.com>) + +2002/02/07 + - Bug in the documentation (setup.html): the main.cf variables for the + SMTP server process have to be named smtpd_* instead of smtp_*. + Found by Andreas Piesk <a.piesk@gmx.net>. + +2002/02/03 == Released 0.8.3 == + +2002/02/03 + - Patch from Andreas Piesk <a.piesk@gmx.net>: remove some compiler warnings + by using explicit type casts in hexdump print statements. + - Re-released otherwise unchanged patchkit against Postfix-1.1.3. + +2002/01/30 == Released 0.8.2 == + +2002/01/30 + - Re-released unchanged patchkit against Postfix-1.1.2. + +2002/01/24 == Released 0.8.1 == + +2002/01/24 + - Postfix-1.1.1 has been released. The patchkit needed some small adjustment. + - Both Tuomo Soini <tis@foobar.fi> and Carsten Hoeger <choeger@suse.de> + helped out with this small adjustment. As a side effect of Carsten's + complete pfixtls.diff, which I compared after applying Tuomo's adjustment, + I found that pfixtls.c contained several wrong "'" characters: on the + german keyboard there is an accent looking like the apostroph but producing + a different binary code. Obviously on Carsten's machine the code was + changed which became obvious during the comparison. + (Conclusion: I wrote the comments affected on my SuSE-Linux PC at home with + german keyboard. In my university-office I do have HP-UX workstations + with US keyboards.) + +2002/01/22 == Released 0.8.0 == + +2002/01/22 + - Received a comment from Wietse on the mailing list, that it is better + to resolve the "standalone" issue by using the already available + SMTPD_STAND_ALONE() macro in smtpd. Undid 0.7.16 change and made + new change in smtpd.c. + - Updated links in the References section of the documentation. + +2002/01/21 == Released 0.7.16 == + +2002/01/21 + - When calling "sendmail -bs" and STARTTLS is enabled, smtpd tries to + read the private key and fails due to insufficient permissions (smtpd + is run with the privileges of the user). This case is caught since + version 0.6.18 of the Postfix/TLS patchkit: STARTTLS is still being + offered but a "465 temporary failure" message is issued. Some mailers + (read this: PINE) will then refuse to continue. (And an irritating + error message indicating the failure to read the key will be logged.) + Experienced by "Lucky Green" <shamrock@cypherpunks.to> . + - Solution: Disable STARTTLS when running "sendmail -bs" by adding + "-o smtpd_use_tls=no -o smtpd_enforce_tls=no" to smtpd's arguments + upon startup. Using STARTTLS does not make sense in simulated + SMTP mode. + +2002/01/18 == Released 0.7.15 == + +2002/01/18 + - Postfix 1.1.0 has been released. The patchkit for the former snapshot + version applied cleanly and now becomes the patchkit for the stable + version. + +2002/01/16 == Released 0.7.14a == + +2002/01/16 + - Snapshot-20020115 is released. Adapted patchkit. + - Add Postfix/TLS entries into the new conf/postfix-files + (Tuomo Soini <tis@s.foobar.fi>, Carsten Hoeger <choeger@suse.de>). + +2002/01/14 + - OpenSSL: a user reported that session caching stopped working for him + with OpenSSL 0.9.6c. I found that this is also true for my own + Postfix/TLS installation. + Solution: server side session caching is broken in OpenSSL 0.9.6c when + using non-blocking semantics (Postfix/TLS is affected as it uses + BIO-pairs); sessions are simply not added to the cache. This bug + is not security relevant. A fix has been applied to the OpenSSL source + tree for the next release. + +2002/01/08 == Released 0.7.14 == + +2002/01/07 + - New snapshots released as release candidates. Adapted the patchkit + to snapshot-20020107. Moved our production servers from 20010228-pl08 + to snapshot-20020107 with the adapted patchkit. + - Fix documentation: tlsmgr can be run chrooted since a long time. + +2001/12/21 + - OpenSSL 0.9.6c is released. Postfix/TLS is fully compatible. + +2001/12/19 == Released 0.7.13e == + +2001/12/19 + - Adapted patchkit to snapshot-20011217. + +2001/12/12 == Released 0.7.13d == + +2001/12/12 + - Adapted patchkit to snapshot-20011210. Adaption provided by + Tuomo Soini <tis@foobar.fi>. + +2001/11/28 == Released 0.7.13c == + +2001/11/28 + - Adapted patchkit to snapshot-20011127. + +2001/11/26 == Released 0.7.13b == + +2001/11/26 + - Adapted patchkit to snapshot-20011125. + +2001/11/22 == Released 0.7.13a == + +2001/11/22 + - Adapted patchkit to snapshot-20011121. + +2001/11/15 == Released 0.7.13 == + +2001/11/15 + - Adapted patchkit to postfix-20010228-pl08 and snapshot-20011115. + +2001/11/06 == Re-released 0.7.12 == + +2001/11/06 + - Snapshot-20011105 released. No patch conflicts, but in order to have + the pfixtls-* filename and home page entry reflect the new version, + I'll re-release 0.7.12. + +2001/11/05 == Released 0.7.12 == + +2001/11/05 + - Release of Postfix-20010228-pl06 and snapshot-20011104. The snapshot + version had some minor patch conflicts to be resolved. + +2001/10/14 == Released 0.7.11 == + +2001/10/14 + - Bug fix (client mode): when the peername is checked against the CommonName + in the certificate, the comparison does not correclty ignore the case + (the peername as returned by DNS query or set in the transport map + is not transformed to lower case). This bug was introduced in 0.7.5. + +2001/10/09 == Released 0.7.10 == + +2001/10/09 + - Snapshot-20011008 is released. Some minor adaptions are required to + sort out patch conflicts. + +2001/09/28 + - Received patch from Uwe Ohse <use@ohse.de>: There is a bug in sdbm's + handling of the .dir file, that also applies to Postfix/TLS. + The problem only appears for large databases. + - The example entries in conf/master.cf for the submission and smtps services + use "chroot=y" flags, while the Postfix default is "chroot=n". This could + lead to hardly explainable problems when users did not note this fact + during setup. + Fixed example entries to also use "chroot=n" default. + +2001/09/18 + - Wietse releases Postfix-20010228-pl05. The patch applies cleanly with + "patch -p1 ...", so it is not necessary to release a new patchkit. + +2001/09/04 == Released 0.7.9 == + +2001/09/04 + - Due to unititialized variable in smtpd_state.c, AUTH may not be offered + without TLS even though smtpd_tls_auth_only was not enabled. + (Patch from Nick Simicich <njs@scifi.squawk.com>.) + +2001/08/29 + - In the snapshot-20010808 version of 0.7.9, the "tlsmgr" line in the sample + conf/master.cf is missing (reported by Will Day <wd@hpgx.net>). Fixed. + +2001/08/27 == Released 0.7.8 == + +2001/08/27 + - Received bugreport about issuer_CN imprints consisting of long strings + of nonsense. This only appeard with certificates issued from a certain + CA (RSA Data Security Inc., Secure Server Certification Authority). + (Will Day <wd@hpgx.net>) + - The problem: the issuer data of this certificate is: + Issuer + C=US + O=RSA Data Security, Inc. + OU=Secure Server Certification Authority + It does not contain a CN (CommonName) field. OpenSSL's + X509_NAME_get_text_by_NID() function does not catch this condition + (no error flag set), but it also does not set the name in the memory + location specified. + - Solution: + 1. Preset the memory for the string to '\0', so that a string of length + 0 is obtained on the failure described above. + 2. When no CN data is available, use the O (Organization) field + instead. The data are used for logging only (it is the issuer, not + the subject name), so this change does not affect functionality. + +2001/08/22 == Released 0.7.7 == + +2001/08/22 + - Found one more bug: erronously called SSL_get_ex_new_index() instead + of SSL_SESSION_get_ex_new_index() (note the _SESSION missing). This + could be responsible for the failure at the locations found during + debugging. Works fine on HP-UX (did also before), must cross check + at home... + +2001/08/21 + - Received report, that smtp (client) fails with signal 11 (platform: + linux redhat). Cannot reproduce any problem on HP-UX (did run 1 + week in production before release). But malloc() and stack strategies + are different between platforms. + - Can reproduce the failure on my Linux PC at home :-(. + - Found one bug in new_session_cb(): on successfull external caching, + success is reported by a return value of 1. This however must be another + bug, as it has nothing to do with the locations of the failure, when + analyzing the core dumps/running under debugger. + Still getting SIGSEGV... + +2001/08/20 == Released 0.7.6 == + +2001/08/20 + - Following "popular demand" implemented new feature and configuration option + "smtpd_tls_auth_only": Only allow authentication using the AUTH protocol, + when the TLS encryption layer is active. Default is "no" in order to + keep compatiblity to postfix without TLS patch. + This option does not distinguish between different AUTH mechanisms. + +2001/08/16 == Released 0.7.5 == + +2001/08/15 + - The new session cache handling is working now at my site for quite some + time. + - Client side: modified peername matching code, such that wildcard + certificates can be used. Matching is done as in HTTP/TLS: only the + leftmost part of the hostname may be replaced by a '*'. + +2001/08/09 + - Further debugged the CRYPTO_set_ex_data() functionality. + - Unified "external cache write" and "external cache remove" callbacks + for client and server side. The "external cache read" functions are not + that easy to combine, as the lookup keys are quite different and do not + match the fixed interface to the callback function. + - Change shutdown behaviour according to SSL_shutdown(). When SSL_shutdown() + returns, the shutdown handshake may not be complete, if we were the first + party to send the shutdown alert. We must call SSL_shutdown() again, + to wait for the peer's alert. + +2001/08/08 + - Postfix snapshot 20010808 is being released. + +2001/08/08 + - Rewrite server side to remove externally cached sessions via callback. + - Rewrite client side to remove externally cached sessions via callback. + This turns out to be more difficult as expected, as the client side + session cache is sorted by hostnames, but the callbacks are called + with the SSL_SESSION objects. The information must be stored into the + SSL_SESSION objects by using the CRYPTO_set_ex_data() functionality, + the documentation of which, ahem, ... + - Reloading sessions stays separate, as the functionality is different. + +2001/08/07 + - Started reworking the session cache code. + * On the server side the retrieval from the external cache and the writing + to the cache are handled by callback functions. The removal is handled + directly. + * On the client side, all session cache operations are performed explicitly. + * The explicit handling is on the client side is bad, as it requires a + quite complicated logic to detect session reuse and the appropriate + handling. + * The explicit handling of session removal on both sides is bad, as + the OpenSSL library will remove sessions (on session failure) according + to the TLS specifications automatically, so we want to take advantage + of this feature and have the externally cached sessions removed as + required via callback. + - First step: on the client side, also use the new_session_cb(), so that + new sessions are automatically saved to the external cache on creation. + +2001/08/01 + - Postfix-20010228-pl04 is being released. + +2001/07/11 == Released 0.7.4 == + +2001/07/10 + - Postfix snapshot 20010709 was released. Resolved some minor patch + conflicts. + +2001/07/10 + - OpenSSL 0.9.6b has been released including a security fix for the + libraries internal pseudo random number generator. + * Note: to exploit the weakness, an attacker must be able to retrieve + single random bytes. As in Postfix/TLS random bytes are only used + indirectly during the SSL handshake, an attacker could never access + the PRNG in the way required to exploit the weakness. + * Postfix/TLS is therefore not vulnerable (as are most (all?) applications + utilizing the SSL layer). + * The OpenSSL team however recommends to upgrade or install the bugfix + included in the announcement in any case. + * Details can be found at http://www.openssl.org/ + +2001/05/31 == Released 0.7.3a == + +2001/05/30 + - Report from <Andre.Konopka@Presse-Data.de>: TLS logging does not work. + Reason: parameters are not evaluated in mail_params.c, as the corresponding + lines for other_int_defaults[] were missing from the patch. This + only affected the 0.7.3-snapshot version, the version for "stable" + is correct. + I will release 0.7.3a with this fix only for the snapshot version to keep + version numbering consistent with the "stable" version. + +2001/05/28 == Released 0.7.3 == + +2001/05/28 + - Upgraded to snapshot-20010425: resolved some minor patch conflicts. + No functional changes. + +2001/05/16 + - Received french documentation (doc_french/) contributed by + Etienne Roulland <Etienne.Roulland@univ-poitiers.fr>. + +2001/05/03 == Released 0.7.2 == + +2001/05/03 + - Postfix-Snapshot 20010502 is released. Bernhard Rosenkraenzer + <bero@redhat.de> supplies an adapted patch for Postfix/TLS, as the + normal patch has several rejections because of code changes; + functionality has not changed. + +2001/05/01 + - Patchlevel 02 of Postfix 20010228 is being released. The Postfix/TLS + patchkit applies cleanly when using the "-p1" switch to patch. + +2001/04/09 == Released 0.7.1 == + +2001/04/06 + - OpenSSL 0.9.6a is released. It contains several bugfixes and will become + the recommended version to be used with Postfix/TLS. + I will run some more test and then re-release Postfix/TLS (without + additional changes to the source) as 0.7.1 to make people aware of the + new versions of Postfix and OpenSSL. + +2001/04/05 + - Hint from Bodo Moeller <moeller@cdc.informatik.tu-darmstadt.de>: + the "Known Bugs" section in doc/test.html actually contains bugs + of clients and/or interoperatbility problems. Better name it + "Known interoperability problems" and rename the entries + "Postfix/TLS server" and "Postfix/TLS client" to improve clarity. + +2001/03/29 + - Patchlevel 01 of Postfix 20010228 is being released. The Postfix/TLS + patchkit applies cleanly when using the "-p1" switch to patch. + OpenSSL 0.9.6a will be out within the next handful of days, so I will + delay the release of a new patchlevel until then. + +2001/03/01 == Released 0.7.0 == + - IMPORTANT: If you are upgrading from a much older version, you will find + that some configuration options have changed over time (fingerprints are + now handled with ':'. check_relay_ccerts is now permit_tls_clientcerts. + Session caching has been reworked.) + It is recommended to re-read the sample-tls.cf file or the html version + in the documentation. + +2001/03/01 + - Wietse has announced the _release_ version (non-beta) or postfix: + 20010228! + - Applied the Patchkit to the _release_ version (not the snapshot version). + Resolved one minor patch conflict. + - So, it's time to call this Postfix/TLS 0.7.0. + +2001/02/26 == Released 0.6.38 == + +2001/02/26 + - Snapshot-20010225 has been released. Resolved one minor patch conflict. + +2001/02/23 == Released 0.6.37 == + +2001/02/23 + - Snapshot-20010222 has been announced as RELEASE CANDIDAT. Resolved one + minor patch conflict. + - Removed "check_relay_ccerts" restriction which has been replaced + by "permit_tls_clientcerts" in 0.6.24. (Was left in until now for + transition.) + - Do not try to save session data > 8kB, since this cannot be handled + by SDBM. (This is more or less academical, since I have never met a + session even half that large.) + +2001/02/19 == Released 0.6.36 == + +2001/02/05 + - Snapshot-20010204 has been released. Resolved one minor patch conflict. + +2001/02/03 == Released 0.6.35 == + +2001/02/03 + - Snapshot-20010202 has been released. Resolved one minor patch conflict. + +2001/01/29 == Released 0.6.34 == + +2001/01/29 + - Snapshot-20010128 has been released. Resolved some minor patch conflicts. + +2001/01/11 == Released 0.6.33 == + +2001/01/10 + - Discussion in Thread "When to get peer certificate?" continues and it + comes out, that cross references between datastructures are well maintained + inside OpenSSL. A fact not well known due to lack of documentation + (seems I am facing some more work on the OpenSSL manpages :-). + - Moved around data needed for the certificate verification: a lot of + "static" entries globally needed inside pfixtls.c could now be moved + into the connection specific TLScontext. + +2001/01/07 == Released 0.6.32 == + +2001/01/07 + - Since now the checks at handshake stage (in pfixtls.c) are more strict, + some of the checks in smptd.c and smtp_proto.c could be removed. + At a later point I can probably move even more checks into pfixtls.c... + +2001/01/05 + - Had a discussion with Ari Pirinen <aripirin@europe.com> on openssl-users + (Thread: When to get peer certificate?) about the earliest possible + place to check the CommonName of the peer against the expected name. + (This is what smtp does when enforcing the peername of the server it + is connecting to.) + The final result was, that the check can already been done inside the + verifiy_callback() routine even before the handshake is completed. + The positive side effect is, that since the session is never completly + established, it is also not cached on either client or server. + - Since this is a good idea, I have extended the verify_callback in + src/global/pfixtls.c to check the CommonName of the peer (if applicable) + and have the handshake shut down immediatly on failure. I have also + changed the behaviour so that whenever a positive certificate verification + is required, the handshake is shut down immediatly. + (The versions up to now did delay these checks until the session was + established and then shut down the connection. I had established this + practice while working on BIO-pairs and running into a bug in + OpenSSL 0.9.5 (fixed now) and with the verify depth.) + +2000/12/23 == Released 0.6.31 == + +2000/12/23 + - Bug: When only enabling smtpd_tls_wrappermode and not additionally setting + smtpd_use_tls or smtpd_enforce_tls, the TLS engine was not fired up on + startup of smtpd + Fixed: also start TLS engine when only smtpd_tls_wrappermode is enabled. + (Experienced by "Fiamingo, Frank" <FiamingF@strsoh.org>) + +2000/12/18 == Released 0.6.30 == + +2000/12/18 + - New snapshot 20001217 has been released. Due to the change of "timeout" + parameters now being its own class and table, the old patchkit does not + apply cleanly! + - Checked out Postfix/TLS parameters being timeout values and put them into + the new style time parameter table. This allows to specify time values + like 3600s or 1h. Updated sample configuration to reflect this new style. + - "Fiamingo, Frank" <FiamingF@strsoh.org> pointed out to me, that there are + three parameters in src/global/mail_params.h (namely DEF_TLS_RAND_EXCH_NAME, + DEF_SMTPD_TLS_CERT_FILE, DEF_SMTPD_TLS_CA_FILE) that are hardcoded as + "/etc/postfix/something". + This does not match the usual style of postfix, where no paths are + hardcoded this way. I have removed the defaults for CERT_FILE and CA_FILE. + The RAND_EXCH is needed for good PRNG seeding on systems without + /dev/urandom, I however don't know yet, how to rearrange this requirement. + I could use the Postfix internal mechanisms to enforce a parameter, but + this would annoy people having compiled in TLS but not activated. + +2000/12/13 == Released 0.6.29 == + +2000/12/13 + - Snapshot-20001212 has been released. + - Undid bugfixes for 20001210 which now are included in the new snapshot. + +2000/12/12 == Released 0.6.28 == + +2000/12/12 + - Added bugfix provided by Wietse on postfix-users@postfix.org for + "postconf -m" behaviour. + +2000/12/11 + - New snapshot-20001210 released. Some patch conflicts occur. Additionally + * adjusted calls to myflock() to changed interface, + * fixed bug in smtpd_sasl_glue(), where a change to the name_mask() + call was not applied in the original snapshot. + +2000/12/05 == Released 0.6.27 == + +2000/12/04 + - Print informational message "SSL session removed" only when + var_smtp[d]_loglevel >= 2. (Proposed by Craig Sanders <cas@taz.net.au>.) + - Extend logging of "setting up TLS connection from/to" and corresponding + success/failure messages so that they include the hostname/ip address. + This way it is much easier to automatically analyze errors by simply + grepping for e.g. "SSL_accept error" and immediately get the peer + causing the problem without further logfile processing. + (Proposed by Craig Sanders <cas@taz.net.au>.) + - When experiencing a TLS failure due to TLS-enforced failure in client mode + (no certificate or hostname/certificate mismatch etc), immediately shut + down the TLS mode with "failure" indication, so that the SSL session is + removed immediately. This way a new session is always enforced in the + case the peer has fixed the problem; no need to wait for the timeout. + +2000/11/29 == Released 0.6.26 == + +2000/11/29 + - Found security relevant bug in the OpenSSL library: the verify_result + stating whether or not the certificate verification succeeded is not + stored in the session data to be cached and reused. + - This bug was found during the development of Postfix/TLS around one + year ago, the bug in the library was however only fixed for the server + side. At that time I also tested the server side behaviour but ommitted + to check the client side, too. + - Versions before Postfix/TLS 0.4.4 experienced this problem for both + server and client side. Before 0.6.0 a workaround was active for both + sides, which has been removed at 0.6.0 in the believe that the bug + was gone (I only tested the server side, which was fixed). + - Fixed that bug in OpenSSL also for the client side (I can do this myelf + now that I have been invited to join the OpenSSL developers team :-). + The fix is availabe as of today and will be part of the 0.9.7 release + of OpenSSL (or 0.9.6a, if this release will be published). + - Included a workaround inside Postfix/TLS for OpenSSL library versions + before 0.9.6a or 0.9.7, respectively. + +********************** Begin Description + + - By not caching the verify_result for the client side, the following + behaviour could appear: + * The problem can only appear when smtp_tls_session_cache_database + is activated. + * smtp_use_tls = yes + X On the first connection, the certificate fails verification, failure + is logged: + smtp[*]: Unverified: subject_CN=serv01.aet.tu-cottbus.de, issuer_CN=BTU-CA + For any following connections until the session times out (default 1 hour), + the peer certificate seems to pass verification: + smtp[*]: Verified: subject_CN=serv01.aet.tu-cottbus.de, issuer_CN=BTU-CA + X Security Impact: + Unverified certificates are logged as if verification had succeeded. + * smtp_enforce_tls = yes + X After the verification failure, the session is never correctly established + and hence not reused. + X Security impact: + None, as the session is never reused. + * smtp_enforce_tls = yes after smtp_tls_enforce_tls = yes for a server. + X If the session has been recorded with use_tls and then for this server + enforce_tls is set, the wrong verify_result could be used within the + session cache timeout (default = 1 hour). + X Security impact: + If TLS shall be enforced for a recipient, there is a window of approx. + one hour from setting the "enforce_tls" switch until a verification + failure is noted. For this to happen, a TLS session to that server must + have been used with use_tls set and the not-verifiable certificate must + have been recorded in that session. + - Evaluation: + Even though this _is_ a security problem, I consider risk to be *low*, + given the conditions under which the problem might occur. + +********************** End Description + +2000/11/27 == Released 0.6.25 == + +2000/11/26 + - Added "permit_tls_all_clientcerts" for smtpd_recipient_restrictions. + When this option is enabled, any valid client certificate allows relaying. + This can be practical, if e.g. a company has a special CA to create + these certificates and only this CA is "trusted". It however does not + allow finer control, so if e.g. an employee leaves, he could still + relay. Postfix/TLS does not (yet) allow CRL (certificate revocation lists). + (Added on popular demand.) + - Make the client behaviour more configurabe: when enforcing TLS connections, + the peer's name is checked against the CommonName in its certificate. + New configuration variable "smtp_tls_enforce_peername" (default=yes) + can now be used to accept peername!=CommonName. The server's certificate + must still pass the verifcation process against a trusted CA! + In tls_per_site, the according key is MUST_NOPEERMATCH. + (Added on demand.) + +2000/11/24 + - If the server requires a client certificate and no certificate is presented + or the certificate fails verification, the connection is shut down but + no information is logged. + -> add according msg_info() in smtpd/smtpd.c:startls_cmd(). + - If TLS is not enforced, it does not make sense for a server to require a + client certificate. If no STARTTLS is issued, the SMTP would continue + anyway, so why shut down when TLS is activated without verifyable client + certificate? + -> ignore smtpd_tls_req_ccert=yes, if TLS is not enforced and only treat + like smtpd_tls_ask_ccert = yes with an according information logged. + +2000/11/22 == Released 0.6.24 == + +2000/11/22 + - Installed on my own servers and changed configuration to use the new + "permit_tls_clientcerts" option name. Patchkit will be released after + some hours of successfull operation. + +2000/11/21 + - New snapshot-20001121 is being released. The patch applies without any + conflict when applied with "patch -p1", so no need to rush out an updated + patchkit. + - Rename the smtpd_recipient_restrictions option from "check_relay_ccerts" + to "permit_tls_clientcerts" to better match the naming scheme. + Leave in the old option for now to not break existing configurations. + The final incompatible removing is scheduled of release 0.7.0 of the + patchkit which will be matching the next "stable" release of postfix. + - There is no manual page for tlsmgr.8 (pointed out by Terje Elde + <terje@thinksec.com>). + Fix the comments at the beginning of tlsmgr.c and create tlsmgr.8. + - In the session cache code an additional 20 bytes were allocated when + converting SSL_SESSION data to binary using i2d_SSL_SESSION(). + In adding these 20 bytes to the size listed by i2d_SSL_SESSION() I followed + the example in the OpenSSL source (PEM_ASN1_write()). These 20 bytes are + only added since when writing the PEM, a 20 byte checksum is added, so + we don't need it in our case -> removed. + (Researched after Carlos Vicente <cvicente@mat.upc.es> asked what these + 20 bytes are good for :-) + +2000/10/30 == Re-Released 0.6.23 == + +2000/10/30 + - Postfix snapshot-20001030 with an important bug fix is made available. + The patchkit applies without any problem (patch -p1). + Hence, I re-release the 0.66.23 release for the new snapshot. + +2000/10/30 == Released 0.6.23 == + +2000/10/30 + - New Postfix snapshot 20001029 available with some important bug fix. + Adjusted patchkit (only minor conflicts). + +2000/10/27 + - The CN_sanitize function (src/smtpd/smtpd.c) that shall make sure that + no illegal sign is included into the Received: header does not work + on systems were "char" is unsigned by default. + (Linux on s390, found by Carsten Hoeger <choeger@suse.de>) + -> Worked out a more precise (even though not looking elegant) solution + that checks out all acceptable characters. + - Sent new smptd.c to Carsten Hoeger for testing, will wait with new + Postfix/TLS release. + +2000/10/06 == Released 0.6.22 == + +2000/10/06 + - snapshot-20001005 has been released, featuring fast ETRN. Only some minor + patch conflicts needed to be resolved. + +2000/09/28 == Released 0.6.21 == + +2000/09/28 + - snapshot-20000924 seems to be somewhat longer lasting. I have been asked + for a new Postfix/TLS release against snapshot-20000924, hence I will + create one. + - Running OpenSSL 0.9.6 for a week now to my full satisfaction. I will bump + bump up the Postfix/TLS version counting to include "0.9.6", even though + it will still run fine with 0.9.5a. + +2000/09/25/ + - snapshot-20000924 is available; only small adjustments. + - Wietse seems to release new snaphots on a daily basis, it doesn't make + sense to follow with a new Postfix/TLS release every day. + +2000/09/23 == Released 0.6.20 == + +2000/09/23 + - Recompile OpenSSL-0.9.6-beta3 with the change and reinstall old pfixtls.c: + works again. Hence, all versions of Postfix/TLS working against 0.9.5a + will also work again 0.9.6-final, which shall be released on 2000/09/24! + - Wietse releases snapshot-20000923, patchkit adapted. + - Went through the "install.html" document to add a remark about + OpenSSL-0.9.6. This document is of historic quality but did not fit + actual versions of Postfix/TLS, we are far beyond OpenSSL 0.9.2: Updated. + +2000/09/22 + - Wietse releases snapshot-20000922. The source directory hierarchie has + changed, so the patch needs to be adjusted at several places. + - Run tests against OpenSSL 0.9.6-beta3: problems occur! + * Certificates are no longer verified, since an informationa flag about the + CA certificate search process is written into the error storage and + thus misinterpreted as verification failure. + * Changed Postfix/TLS source to maintain its own error storage based on + the verify_callback, send out according warning to Postfix/TLS mailing + list. + * Unfortunately, this will break all older versions of Postfix/TLS. + Sent out analysis to OpenSSL-bugs@openssl.org. + * Additional change is made to OpenSSL: the new behaviour is only activated + when a special flag is set, so compatibility is restored! + +2000/09/21 + - Wietse releases snapshot-20000921. Some minor patch conflicts resolved. + +2000/09/14 == Released 0.6.19 == + +2000/09/14 + - Received a bug report: Postfix/TLS will accept a mail even though + smtpd_req_ccert=yes (require use of client certificate) and no + client certificate is presented. + Reason: when no client certificate is presented SSL_get_verify_result() + will return X509_V_OK, since this is the default value. + Solution: only set "peer_verified" internal information, if the + verify_result is X509_V_OK _and_ a peer certificate is available. + Remark: This default value does not make too much sense. I will file + a bug report/patch before the next release of OpenSSL... + +2000/09/03 == Released 0.6.18 == + +2000/09/03 + - When calling "sendmail -bs", smtpd is started without root privileges, + hence it cannot open the private key file and the session cache database. + Since the database routines do not offer a graceful return (only fatal + and abort), this leads to a failure when TLS and session caching is + activated. + This affects PINE users (noted by Craig Sanders <cas@taz.net.au>). + Solution: Try to read the private key first; if that fails, we can + gracefully recover and won't touch the session cache database at all. + - When STARTTLS is configured for smtpd but does not work (e.g. because of + unaccessible keys), smtpd answers with "465 TLS not available due to + temporary reasons". After that the connection was closed, this is however + not necessary, as the client may decide to continue without TLS activated. + - Craig Sanders <cas@taz.net.au> contributes a script to automatically + generate the keys and certificates for Postfix/TLS usage. Added + "make-postfix-cert.sh" to the contributed/ directory. + +2000/09/02 == Released 0.6.17 == + +2000/09/02 + - Craig Sanders <cas@taz.net.au> reports that he has connection problems + with a site; the message in the log is: + SSL_connect error 0 + 8847:error:140943F2:SSL routines:SSL3_READ_BYTES:sslv3 alert unexpected message:s3_pkt.c:956:SSL alert number 10: + * This is the error caused by the faulty TLS implementation with + CommunigatePro. The bug is fixed in later versions of CommunigatePro, + The site shall be contacted, they should update. + - More important, he reports a segmentation fault immediately after this + problem. + - Bug: when not using session caching and an error occurs during the TLS + handshake, pfixtls_start_clienttls() tried to remove the erronous + session from a non-existant session cache. + Fix: check the existence of the session cache before trying to access it. + Comment: at all other places in the code this condition was already + caught. + - Remark: actually session caching was configured, but the configuration + variable was mistyped because... + it was wrong in conf/sample-tls.cf and doc/conf.html. + The correct values are "smtp[d]_tls_session_cache_database" instead of + "smtp[d]_tls_use_session_cache_database". + Unfortunately this is not flagged by Postfix... + +2000/08/25 == Released 0.6.16 == + +2000/08/25 + - Make sure, that the smtp[d] processes will try to access the "daemon" + entropy sources, but will only print an info when not available. Using + the PRNG-exchange file, they can happily run without. + - Moved HAS_SSL checks, such that the package compiles also when configured + without -DHAS_SSL. + +2000/08/24 + - Changed the handling of the PRNG-exchange file. Until now it was written + by tlsmgr and read by the smtp[d] daemons. This had the disadvantage, that + until tlsmgr rewrote new bytes to the file, all starting daemons read the + same seed (to which some more bits, but not too much were added). + - Now the file is handled in read->stir into pool->write back mode, so that + every daemon will add its own entropy bits. + - The smtp[d] processes will do so when starting, when opening a TLS + connection and when closing. + - The tlsmgr will also read back the file and add it to its pool, so that + no entropy is lost. + - This change significantly increases the "self seeding" capability of + the TLS service. + +2000/08/09 + - Cleaned up the new PRNG-seeding. + - When tlsmgr looses connection to an EGD-source (because it was restarted), + tlsmgr performes an exit(0), so that a newly started tlsmgr can reconnect. + [chroot/dropped privileges]. + +2000/08/04 + - Introduced new entropy sources for single daemons: + * tls_daemon_random_source + Using this source (same style as for tlsmgr), each starting daemon can + obtain additional entropy (32 bytes by default). The PRNG-exchange file + is still read. + - I am not sure about the policy for this feature. If such a source is + given, should a failure be considered fatal? + +2000/07/23 + - Started reworking the PRNG seeding: + * tlsmgr now recognizes tls_random_source as + dev:/dev/urandom /* Direct read from device file */ + egd:/path/to/socket /* Connection via EGD-socket */ + /path/of/plain-file + * If a dev: or egd: is given, tlsmgr will connect and keep the connection + open, so that it now can run in chroot-mode with dropped privileges. + - Since EGD can be drained, but the connection is permanently open, only + suck a small number of bytes (default 32) at a time, but do it more + often. + +2000/08/09 == Released 0.6.15 == + +2000/08/09 + - Traced through OpenSSL to learn more about the verify_callback-feature. + The callback is called several times. When it returns "1", the handshake + will continue, when it calls "0", the handshake will immediately fail + (and Postfix/TLS will also close the TCP connection). + - Following the sample in the OpenSSL-apps, the verification chain depth + was the only property triggering this effect, so this stood hidden until + now. Obviously, users having longer chains did set the verifcation + depth accordingly or they gave up, since this was never reported... + - Changed the behaviour of verify_callback() to never return "0", such that + we can deal with the verification result later in a more consistent manner. + If we only enable and not enforce, we simply want to ignore problems with + the certificate. + - verify_callback() did not print out all information, since the wrong + state variables (pfixtls_*active instead of pfixtls_*engine) were + checked. The *active state variables are only set later. + As the verify process now became rather narrative, the normal logging + is only done in loglevel 2! + - Arrrghhh. The conf/sample-tls.cf _and_ the html-docu (which is actually + copied from conf/sample-tls.cf) has wrong names for the verification- + depth parameters. *_vd instead of *_verifydepth and ccert<->scert. + [Wondering, why this never popped up before...] + - Changed the default-verifydepth to "5" which should suffice for most + cases. Maybe the limit could also be completely removed, but we should + at least receive a warning hint when something goes wild. + Since OpenSSL>=0.9.5 is required for Postfix/TLS anyway, certificate chain + verification can now be used, so the caution applied before is no longer + necessary. + +2000/08/08 + - Tracked down the double-free() call in smtp with Efence. SSL_free() + does call SSL_SESSION_free() on the negotiated session. Hence, I must + not call SSL_SESSION_free() on the session in question, it will be + removed anyway. + - Also tracked down the certificate chain feature. Reason is the + verify_callback() in global/pfixtls.c. It flags a chain depth that + is too long as fatal, hence the connection is immediately closed. + +2000/08/04 + - Received information from Alain Thivillon <Alain.Thivillon@hsc.fr>: + FreeBSD-CURRENT offers malloc() with additional checks enabled. + After successfully delivering, smtp dumps core with free() called + twice in TLS mode. + - I noted, that there is a communication problem with his site an my new + certificate issued by the universities computer center (which has a chain + depth of 2). Step back to the old self certificate for the time being. + +2000/07/27 == Released 0.6.14 == + +2000/07/27 + - Introduced new configuration parameter "smtpd_tls_wrappermode" that + enables the (deprecated) old style SSL-wrapping around SMTP. It could + be run on a different port (once smtps=465) was recommended for this + services. + This method is used by old versions of Outlook (Express), the Mac versions + and even actual versions, when not run on port 25. + [Actually it was only a handful of lines, so it doesn't hurt too much, + even though it does not follow any RFC.] + - I recommend using this option only from master.cf. Example lines added + to conf/master.cf and description added to Postfix/TLS-doc/conf.html. + - When having SASL enabled and TLS-enforce mode in "smtpd", only offer + AUTH, when TLS has been activated. Otherwise the client might simply + send the unencrypted credentials before it receives + 530 Must issue a STARTTLS command first + and an eavesdropper already has what he was looking for. + +2000/07/19 == Released 0.6.13 == + +2000/07/19 + - Changed the library-initializaton call to new naming scheme + (SSLeay_add_ssl_algorithms() to OpenSSL_add_ssl_algorithms() :-). + - Updated documentation to reflect the use of chain certificates with + CAfile and smtp[d]_tls_cert_file (see 2000/07/06). + - Documentation: the interoperability problem with CommunigatePro has been + solved: CommunigatePro violated the TLS-RFC and has been fixed. + - Typo: It is "to stir" not "to stirl" :-) + +2000/07/06 + - Received certificate for our site from our computer center. It's a chain + certificate. Now load the cert with SSL_CTX_use_certificate_chain_file(), + in order to better load the chain CA certificates. + +2000/07/04 + - Reported Wietse about a possible problem in the SASL code, a relay check + may also be performed if sasl was not enabled and might lead to unwanted + relay. + As the fix is in my own codebase, I will leave it Postfix/TLS until a + new snapshot (or final release) is available. + +2000/06/02 == Released 0.6.12 == + +2000/06/02 + - Adapted to Snapshot-20000531 (minor patch conflict). + - Cleaned up some old header file dependencies in global/pfixtls.c and + global/Makefile.in that are no longer needed due to the interface changes + (timed_read()/write()) in 0.6.7. + +2000/05/29 == Released 0.6.11 == + +2000/05/29 + - Following Bodo Moeller's analysis, the error is due to a mismatch between + the CA certificate accessible in the smtp[d]_tls_CAfile and the one used + in the actual certificate (smtp[d]_tls_cert_file). + Daniel Miller fixed his setup and the problem is gone. + - Introduced a workaround into Postfix/TLS: if the padding error is found, + it is removed from the error-queue by Postfix/TLS, in order to protect + more sites from experiencing this problem. + - Added a warning to conf/sample-tls.cf + - Updated to the latest snapshot-20000528. + +2000/05/27 + - After some fiddling around working through the binary certificate data to + see where it is modified at 0.6.10, I actually note, that both 0.6.9 and + 0.6.10 choke on the data. Now going back up through the functions very + fast reveals the problem: + * The certificate supplied triggers the "RSA-padding" error in any case. + Since the certificate authencity is not enforced on OpenSSL-library level + but inside postfix later, the error is not enforced. + The error messages generated stay however in the error queue. + - For blocking sockets, the SSL_accept()/connect() calls return + "success", so the error-queue is never checked. + - With BIO-pairs, the error queue is checked to find out, whether the + function has just to be called again to continue the handshake, so + the error messages are found and the connection is shut down due to + the error condition. + - Submitted bug report to Bodo Moeller. Bug fix is checked into the OpenSSL + CVS archive: if the error is ignored during the handshake, clear the + error-queue. + * The next release of OpenSSL will behave consistently. + - This leaves open the question, why the RSA-padding error is issued in the + first place. Sent a query to the OpenSSL-* mailing lists. + +2000/05/26 + - A second site experiencing this problem pops up. + -> Issued a warning to the postfix_tls mailing list. + +2000/05/24 + - Contacted Damien Miller <djm@mindrot.org>. He did not change his TLS setup + in the last time. He is running Postfix/TLS-0.6.6. + - Contacted Bodo Moeller <moeller@cdc.informatik.tu-darmstadt.de>, the author + of the BIO-pair part of OpenSSL for some debugging hints. Received several + worthful remarks on what to look for. + - Checked byte-for-byte the data fed into the OpenSSL-library. It does not + differ between 0.6.9 and 0.6.10, so my handling seems to be actually + correct. + +2000/05/23 + - A communication error occurs when talking to mail.mindrot.org: + SSL_accept error -1 + 10264:error:0407006A:rsa routines:RSA_padding_check_PKCS1_type_1:block type is not 01:rsa_pk1.c:100: + 10264:error:04067072:rsa routines:RSA_EAY_PUBLIC_DECRYPT:padding check failed:rsa_eay.c:396: + 10264:error:0D079006:asn1 encoding routines:ASN1_verify:bad get asn1 object call:a_verify.c:109: + - The error occurs both in client and server mode. 0.6.9 does not show + this problem. + - Tried to connect with several other sites, all connections are fine, + this includes sendmail and qmail peers; hence decided to not recall 0.6.10. + +2000/05/23 == Released 0.6.10 == + +2000/05/23 + - Sent a note to openssl-dev@openssl.org about the behaviour of SSL_free() + and BIO_free(), hoping for some clarification whether my way of doing + it is the recommended way. + - Run the software in production mode on my own servers... + - Finished writing the in-source documentation. + - Updated sample-tls.cf and sample-smtp[d].cf to reflect the new timeout + parameters. + +2000/05/21 + - Removed error messages produced by the now non-blocking behaviour of the + TLS layer [apps_ssl_info_callback()]. + +2000/05/20 + - Took results home and tried to run it on my Linux-box: SEGV after + successfully handling the SMTP session!! + * It seems that the SSL_free() and BIO_free() functions interact. + SSL_free() releases the underlying BIO and it will bomb out when + it is then explicitely BIO_free()'ed again and vice versa. + * It did not bomb out on HP-UX, but such things happen. I however want to + know, why the example program does not fail... + * With respect to the bevaviour as is, SSL_free(TLScontext->con); + BIO_free(TLScontext->network_bio) and not touching + TLScontext->internal_bio works. + - Introduced special timeout values for the TLS negotiation stage, as the + timeout values may change with protocol state (suggested by Wietse). + - Started writing a full description of the BIO-pair concept and its + special treatment into the pfixtls.c sourcecode. + +2000/05/19 + - Systematicly implemented a generalized layer handling: + * do_tls_operation() is the generic handler for all SSL_*() input/output + functions. It deals with the non-blocking behaviour of this functions, + requiring appropriate retrys. + * network_biopair_interop() handles the interaction between the socket/fd + and the buffering BIO-pair. + +2000/05/18 + - Based on the example in openssl-0.9.5a/ssl/ssltest.c realized the first + usage of BIO-pairs. (Can do server handshaking.) + - Learned, that the BIO-pair has its own buffering that needs its own + flushing. It is not enough to relay on the SSL_ERROR_WANT_READ/WRITE + state information. + +2000/05/17 == Released 0.6.9 == + - Important: the seperator in the relay-fingerprints is now ':'!!! + Don't forget to change your relay_clientcerts databases. + +2000/05/16 + - Changed pfixtls.c to only use the interface described in util/vstream.c + for handling the VSTREAM. + * Added vstream_context() macro to the VSTREAM-interface. + - Introduce TLScontext to identify the connection instead of the file + descriptor. Move all static data (SSL structure and information gathered + about the connection) into the context. + The TLScontext is allocated on TLS-start for a connection and saved with + the VSTREAM, so several streams can be used at the same time. + - Removed "pfixtls_setfd()" as it is no longer needed. + - Changed the relay_clientcerts list from string_list_* to maps_* interface + to allow usage of ":" in the list. + THIS IS AN INCOMPATIBLE CHANGE!!!! + - Updated documentation accordingly. + +2000/05/12 == Re-released 0.6.8 == + +2000/05/12 + - Wietse announces snapshot-20000511 with an important bugfix. + - Since upgrading from 20000507 to 20000511 is highly recommended, + Postfix/TLS 0.6.8 is re-released for this snapshot (the patch applied + cleanly, just the name of the toplevel directory has changed). + +2000/05/11 == Released 0.6.8 == + +2000/05/11 + - Unlike expected I found some time to install the latest cyrus-sasl-1.5.21 + and test some parts the integration. It does, well, work as advertised + (and the advertisement in SASL_README is not too optimistic). + - When checking all of the rejected patch-snippets for 0.6.6->0.6.7 + I missed the parameter "smtpd_enforce_tls" (noted since I wanted to + enforce TLS encryption while playing around with plaintext passwords) + in the static CONFIG_BOOL_TABLE bool_table[] = {..} in smtpd/smtpd.c + -> I will immediately release a corrected version 0.6.8. + +2000/05/11 == Released 0.6.7 == + +2000/05/11 + - The latest sendmail.8.11.0.Beta1 includes STARTTLS support; it is available + in source code and also uses OpenSSL. + +2000/05/10 + - After having it running at home (Linux) I also install it at work for + the field test. + - No time to install the SASL kit, so this part stays untested as of now. + +2000/05/09 + - Downloaded snaphot and apply the patchkit. + - Straightened out the rejected parts of the patch. + - Due to the new layering with timed_read() and timed_write() functions + the integration of the TLS layer needed special adjustment. + * When TLS is active, the timed_read() and timed_write() functions are + replaced by the corresponding pfixtls_timed_read() and + pfixtls_timed_write() functions. When the TLS functionality is stopped, + the old functions are restored. + * The names of the pfixtls_timed_*() functions are looking into the future, + because they are working as before, the timeout functionality is not + in, yet. + +2000/05/08 + - Wietse announces snapshot-20000507 with a lot of changes. Especially + important: the I/O handling of the smtp-stream has been changed to + a more layered technique that allows easier integration of the TLS layer. + +2000/04/27 == Released 0.6.6 == + +2000/04/27 + - Fixed inconsistency between documentation and actual behaviour: peer + certificate information was not logged at level 1 (found by + Damien Miller <djm@mindrot.org>). + * While at it: the logged information did not say whether the certificate + data logged passed verification or not: fixed. (The information logged + in the Received: header already contained that information.) + - Backported dict_dbm.c from snapshot-20000309 with the updated + dict_delete() behaviour (key not found is not considered fatal). + Maintained dict_sdbm.c accordingly. + +2000/04/18 == Released 0.6.5 == + - Important: + * New session cache mechanism SDBM. Please adapt your main.cf and delete + any old ".db" session cache files manually. + +2000/04/18 + - I am using the SDBM session cache for a week right now and did not have + any trouble, so I think its worth pushing it out. + - I am not completely happy with the dict_del() behaviour of considering + a not-found key fatal. It might happen when the smtp[d] processes would + be allowed to delete themselves. They are not as of now, so I accept it + for now but will reconsider it. + - Updated documentation accordingly. + +2000/04/17 + - Received corrections for the HTML-docs from Ralf Hildebrandt + <R.Hildebrandt@tu-bs.de>. + +2000/04/11 + - Transfered SDBM from home (Linux-testbed :-) to work [found and fixed some + small items when compiling on HP-UX]. Started running it under + "real life" conditions. + +2000/04/07 + - Implemented "SDBM" Simple Database Management routines as also utilized in + ModSSL. Of course, it requires reopening of the databases, so the + routines are changed, that the _file_descriptors_ are left open, but + the _in_memory_ database stuff (especially the cached data) is closed + and reopened on access. This is what is really needed. The pagesize + is increased from standard DBM compatibility to hold the session + information. + Additionally, this software is in the public domain, so no additional + license problems arise. + - The access goes through the dict_* interface, hence the locking is + performed by myflock(). + +2000/04/01 == Released 0.6.4 == + +2000/04/01 + - Updated to the new patchlevel of Postfix (19991231-pl06), some parts of + the patch were rejected due to changes in smtpd. + - Changed patch name with respect of today's release of OpenSSL-0.9.5a. + The code remained unchanged. + +2000/03/25-31 + - The cached informations are not deleted by "tlsmgr" even though stored + and retrieved by the smtp[d] processess. Strange. + - Spend some large amount of time digging through the Berkeley DB + documentation and code. + * It claims that Berkeley DB is multi-process capable. Caveat: it takes + the very complicated "transaction model", that I did not use until now. + Hence the session cache does not work as is. + * Even with transaction model, Berkeley DB requires re-opening of the + databases to get rid of cached information. F*ck. + - Finally, I give up on Berkeley DB for session caching. It will never + work for us. Even if it would, it requires a large amount of helper files + and it seems, that the transaction environment is somewhat fragile when it + comes to some problem. I won't rely on it. + +2000/03/28 == Released 0.6.3 == + +2000/03/28 + - As has been pointed out to me, the TLS information in the Received: + header is not conform to RFC822. + - The TLS protocol and peer CN information is now included in '()', so + that it is a comment. + +2000/03/21 == Released 0.6.2 == + +2000/03/21 + - I have been running DB based session caching with the changes for some + more time now without problems. Am I really confident? No, not really. + I remember the trouble I had with Berkeley DB and sendmail on HP-UX. + I don't think I really trust it. + - Realized single "smtp_tls_per_site" lookup. I cannot use the more or + less comfortable "domain_list" lookups as before, since these do not + return the value, just found or not :-(. + Hence the lookup is realized with maps and exact lookup. I never tried + regexp. But if I understand the docs correctly, it should be possible to + use it here to realize wildcard lookups, if it would not have been + disabled :-(. + - Summary: + * Session Cache will be cleaned at "postfix reload" or "postfix start" + * New table "smtp_tls_per_site" + * Gone: "smtp_tls_[use/enforce]_[recipients/sites]" + + +2000/03/16 + - Changed pfixtls.c, so that it will only open Session Cache databases, + that are already available. tlsmgr is responsible for creation. + - Change tlsmgr.c, such that session cache databases will be removed before + opening, so that fresh databases are used whenever postfix is restarted. + This means, that session information is not kept over a postfix stop/start + or reload sequence, but it also means, that issuing a postfix reload will + clean the session cache. + I don't use simple dict_open with O_TRUNC, because this would not help + against database files, that are locked by hanging smtp[d] processes. + If you think it will also solve the "hang" problem described for + 2000/03/15: in a certain sense it can, since tlsmgr will be killed by + the watchdog and new, fresh cache files are installed, but that is not + more than an ugly hack. It must be solved in a clean manner. + +2000/03/15 + - Experienced some strange problem with Berkeley DB based session cache. + The DB routines hang while trying to delete an entry. I did save the + corresponding "hash:" file and could reproduce it (and walk through + the endless loop with a debugger), but I didn't find the reason why. + Since during "db->del" the database is exclusively locked all other + processes hang however, so this is really bad!!!!!!!! + +2000/03/12 == Released 0.6.1 == + +2000/03/12 + - Created tls_info_t structure to hold all information about the active + TLS connection. Remove all global variables except those for the + running client/server engines (those might be replaced with global + variables in smtpd/smtp, though). + - Added field "dNSName" to the structure (still unused). This will be + used with X503v3 extensions. + - Cleaned up TODO, since some items are now done... + +2000/03/11 + - Added missing #include <sys/time.h> to tlsmgr.c. (Worked without on HP-UX, + showed up on Linux.) + - Bug: removal of server side sessions from the cache in case of trouble + failed, because uppercase hex was used instead of lowercase for the key. + This does not affect removal of expired sessions by tlsmgr. + - Stepped up to postfix-19991231-pl05. + +2000/03/09 == Released 0.6.0 == + - Important: + * This release features an additional daemon, the "tlsmgr", please update + your master.cf accordingly. + * This release does not use the /var/spool/postfix/TLS* directories + anymore. Remove them and re-install the original postfix-script. + * Check the new/changed configuration parameters tls_random* and + smtp[d]_tls_session_cache*. + * This release will only work with OpenSSL >= 0.9.5!!!!! + +2000/03/09 + - Testcompilation of Postfix/TLS without -DSSL and the OpenSSL includes and + libraries passed. + - Worked through tlsmgr.c to remove unneeded header files. + - Wrote documentation for tlsmgr.c. + - Updated documentation on top of pfixtls.c. + - Put (char *) casts into the myfree() calls, where necessary, to make the + HP compiler happy. + - Updated html PRNG documentation in Postfix/TLS. + +2000/03/08 + - Finished first version of "tlsmgr". Does run through session cache + databases and detects and deletes (*) old sessions. + * Had to realize SYNC_UPDATES for the dict_db_delete() function and patch + the flag handling within the function. Changes sent to Wietse. + - Restored qmgr to its original state. + - Extended pfixtls.c to need an additional "needs_095_or_later()" function + when compiled with an older version of postfix. + - The session cache is now enabled, when a database filename is given. + smtp[d]_tls_use_session_cache configuration parameters removed, + updated documenation accordingly. + - Moved the PRNG handling to tlsmgr, applying the new model. tlsmgr will + query external sources at startup and will then feed a PRNG exchange + file with random data in intervals of configurable (but random driven) + length. + If running outside chroot, tlsmgr can query the entropy source (e.g. + EGD or /dev/urandom) again and so increase entropy with time. If the + entropy sources don't limit access, the tlsmgr can run with "postfix" + privileges. Mine does. + -> master.cf became a new entry. + - tlsmgr is realized as a trigger server and has the "fifo" entry. Actually, + it does not take any input. One could utilize it to feed back some entropy + from running smtp[d] processes, but I think this would overload the + issue. + - I will release a 0.6.0 pre-version as is. tlsmgr still lacks the detailed + information in the header and the interface description in pfixtls.c + probably is also not longer up do date. + +2000/03/07 + - Since defective session data can cause SEGFAULTs, it is now armored + by a leading structure that does contain a session cache version and + the postfix library version before the timestamp. If a session does + not match exactly the version numbers, it is immediately discarded + and deleted to avoid harm. + - Removed the seperate storage of the peer's certificate verify_result, + so starting from this moment, Postfix/TLS will only work safely with + OpenSSL >= 0.9.5!!! + - Ported server side session cache routines to the client side; works. + - Analyzed structure of "qmgr" to understand consequences for the planned + "tlsmgr" daemon. Transferred the sceleton. + - Received word from sendmail, a (at least preliminary) TLS enabled test + address is "bounce@esmtp.org". + +2000/03/06 + - Wietse supplied a change to the dict/dict_db mechanism to allow for + synchronous updates. + Session cache updates for the server side seem to work now, removal of + old sessions (when called from the client) integrated. + +2000/03/05 + - Got the database style session cache to run for the server side (at least + partial). The removal of old sessions is not yet realized. + [There are several man pages for OpenSSL as of 0.9.5, but the i2d etc + interfaces are not belong them, so I had to study the source code instead.] + * What is not working by now is the synchronization of the memory database + to disk. It only is synchronized automatically upon close. It would be + necessary to sync after each update or delete, but this is not implemented + in Wietse's dict library. I will post an according proposal. + +2000/03/04 + - Wietse posts a patch to select "EHLO" negotiation even if ESMTP is + not recognized from the 220 greeting. Activating this flag will however + break compatibility with mailers, that simply close the connection + upon EHLO. I don't know how the large the number of these broken mailers + is, but activating "smtp_always_send_ehlo" is a tradeoff. + - Integrated Wietse's patch into Postfix/TLS. + +2000/03/03 + - Received update from Matti Aarnio (Zmailer) is now for some time able + to do server _and_ client side TLS. Updated documenation accordingly. + When testing, Postfix client to Zmailer server failed, because + Zmailer announces with "ESMTP+IDENT" and Postfix does not recognize + the ESMTP token (must be seperate), so only HELO is used and STARTTLS + is not offered by the Zmailer server. Informed Matti accordingly, + will wait until the problem is resolved before actually publishing + the update. + - Enhanced the documentation by listing automatic reply services at which + interoperability can be tested. + +2000/03/02 + - Went through the Postfix source to check out the database routines. + It should be possible to move session caching from directory/file- + based to database. Since DBM only allows blocks (key+contents) of + 1024 bytes and a session is larger, only Berkeley DB can be used. + Put some first bits into Postfix/TLS. + +2000/02/29 == Released 0.5.5 == + +2000/02/29 + - OpenSSL 0.9.5 has been released. Since I want to promote 0.9.5, as it + contains several bugfixes and enhancements, I release a new version + of Postfix/TLS. My personal highlights: + * The bug with Win32 Netscape not commencing after certificate storage + unlocking should be fixed. (I will leave the not in however, as long + as I have not positively checked it myself. Reproducibility...) + * The bug, that the certificate verifiation result is not stored in the + session cache (discovered for Postfix/TLS 0.4.4) is fixed. I will leave + the Postfix/TLS workaround in as long as it will run with older versions + of OpenSSL. + * The OpenSSL commandline tools like "openssl gendh" now support EGD, so + that the examples for generating the DH parameters now will really work + with high quality random data :-) + * The support of 56bit ciphers has lost its importance since 128bit + versions of Netscape etc are now easily available... + - This version does not feature source code changes but updated documenation + when compared with 0.5.4: + * List examples on how to generate good entropy for the PRNG seed in + /etc/postfix/random_file. + - Update the TODO document with respect to the discussion about session + caching and other security items. This document is a very short summary, + for the full discussion check the mail archive at + http://www.aet.tu-cottbus.de/mailman/listinfo/postfix_tls/ + +2000/02/26-28 + - Wietse considers including Postfix/TLS into the main release. A discussion + about security relevant features, especially the session cache inside + the chroot jail takes place. + The discussion will definetely lead to some changes; I have however not + decided on the first step, yet :-) + +2000/02/21 == RELEASED 0.5.4 == + - Important: Another directoy is created in /var/spool/postfix, so don't + forget to install the new versions of conf/postfix-script-*sgid. + +2000/02/21 + - Finished the seed-exchange architecture by saving the random seed at exit + of smtp and smtpd. + - Wrote documentation for the PRNG handling to the documentation. + - Tested on HP-UX (with a current OpenSSL-pre-0.9.5 snapshot and 0.9.4) + and on SuSE-Linux (with 0.9.4). + * THIS VERSION WILL STILL RUN WITH OPENSSL-0.9.4, but it will also run + with OpenSSL-0.9.5. Older versions of Postfix/TLS will not, because the + PRNG is not seeded! + +2000/02/19 + - Start to implement my own model of collecting entropy. All smtp and smtpd + processes will record some items (mainly the time of actions) to add + some entropy into the PRNG. The state is saved and used to re-seed by the + smtp and smtpd processes, so that entropy adds up into the pool. + The seeding by external file is additionally kept in order to be able + to inject additional entropy. + +2000/02/18 + - Included routines to add random seed from a configurable file + "rand_file_name". I don't want to retrieve the entropy from a real + random system source, because the amount of entropy that can be collected + is limited. We might hence stall. Let's think about this problem. + - The SSL_CTX_load_verify_locations() has been fixed in the latest + OpenSSL snapshot. + +2000/02/17 + - Tracked down the SSL_CTX_load_verify_locations() problem in the OpenSSL + library. If more than one CA-certificate is loaded, a bogus return value 0 + is created, because the count of certs is checked to be "1" instead of + allowing ">=1". Reported to openssl-dev. + +2000/02/16 + - Downloaded the latest openssl-SNAPSHOT-20000215 and installed it on + my development machine, then recompiled Postfix/TLS and try to run it. + * Failure: SSL_CTX_load_verify_locations() fails on reading the CAfile with + return value 0, but no actual error is displayed. + If the return value is not checked, the CA-certificates work, so that + they are loaded and the error indicator seems to be bogus. + Reported to openssl-dev mailing list. + * Failure: OpenSSL has become picky about correct seeding of the PRNG + Pseudo Random Number Generator. Installed some "testseed" that is + actually not random, but then Postfix/TLS starts to work again. We + will need some good random seed setup, probably reading from either + /dev/random (if available) or from EGD. + Found out during the experiments, that EGD is not that simple to use + as described in some of my Postfix/TLS docs. Must be upgraded. + Asked in the openssl-dev mailing list about the recommended amount + of random data needed for seeding the PRNG. Ulf Moeller recommends + a minimum of 128bit. + +2000/02/14 == Released 0.5.3 == + +2000/02/14 + - OpenSSL 0.9.5 is to be released within the next hours/days. Since I intend + to use some of its new features soon, I will re-release 0.5.2 as the last + version that will run with 0.9.4 but for the latest postfix patchlevel. + - No functional changes. + - Updated patch for postfix-19991231-pl04. + +2000/01/28 == Released 0.5.2 == + +2000/01/28 + - Stepped up the next postfix patchlevel postfix-19991231-pl03. + No functional changes. + +2000/01/03 == Released 0.5.1 == + +2000/01/03 + - Bug fixed: Don't specify a default value for "smtpd_tls_dcert_file", + assuming that typically a DSA certificate is not used. + Otherwise smtpd will try to read it on startup and the TLS engine won't + start since it is not found. + I didn't note this bug before today, because I could not install this + release in a larger scale on my own servers due to a network failure + of our campus backbone lastring from Dec 31 until today. + - Stepped up to the just released postfix-19991231-pl01. + +2000/01/01 == Released 0.5.0 == + +2000/01/01 + - Upgraded to the new postfix release 19991231. + +1999/12/30 + - Enabled support for DSA certificate and key for the server side. One + can have both at the same time, the selected cipher decides which one + is used. OpenSSL clients (like Postfix/TLS) will prefer the RSA cipher + suites, if not especially changed in the cipher selection list. + Netscape will only use the RSA cert. + - The client side can only have one certificate. There is a way out by using + a callback function, that will receive the list of acceptable CAs and + then do some clever selection: SSL_CTX_set_client_cert_cb(). + I will however have to figure out, how it has to be prepared, it seems, + that there is no example available. + - I have been able to successfully generate a DSA CA and certificates for + some Postfix hosts and to do authentication and relaying as expected. + So now I have to document how it is done in a practical manner... + - Moved up prerelease 0.5.0pre02 to the download site. + +1999/12/28 + - Moved up to SNAPSHOT-19991227. + - Don't forget to check the return value when calling + SSL_CTX_set_cipherlist(). + - Add code to load DH-parameters from disk. + - Add configuration information for the new functionality: DH paramter + support, possibility to influence the cipherlist. + - Moved up prerelease 0.5.0pre01 to the download site. + +1999/12/25 + - Found some minutes to relax from the christmas business. + - Applied the 0.4.7 patch to SNAPSHOT-19991223 and included the new changes + of 1999/12/19. + Once the new stable release of postfix is out, this minimum state will be + the new Postfix/TLS patch: the new functionality will not influence + stability, so it can stay in even if still unfinished. + +1999/12/23 + - Wietse announces SNAPSHOT-19991223: if no severe bugs are found, it will + be promoted as next stable release soon. Good to have kept everything + from yesterday. + +1999/12/22 + - Got a query from a Postfix/TLS user: the patch does not apply cleanly to + SNAPSHOT-19991216 and he somehow messed up to integrate the rejected + parts (it later turned out he just forgot on reject). + Applied the patch myself and generated a diff, sent it to the user + and of course kept a copy for myself, since I will have to apply it + myself eventually once the next "stable" release of postfix is out. + +1999/12/19 + - Began modifications for 0.5.x: + * Added configuration variables for specifying the cipherlist to be used + smtpd_tls_cipherlist and smtp_tls_cipherlist. For the format, there + is some (however sparse) documentation in the openssl package. + * Call SSL_CTX_set_cipherlist() with these data. + * Added default temporary DH parameters to pfixtls.c (only server side is + necessary) and configuration variables to specify user generated + parameters; they are however not used, yet. + The default parameters were generated using the presumably good + /dev/random source. + +1999/12/13 == Released 0.4.7 == + +1999/12/13 + - Addendum to the last change: do also remove sessions, that could _not_ + be reused. + - Updated configuration information: + * As of OpenSSL 0.9.4, certificate chain verification is not sufficient, + since the certificate purpose is not checked, so I recommend to add + all intermediate CAs the list of CAs and stay with a verification + depth of 1. + Work is in progress for 0.9.5. + - Stepped up to the just released new patchlevel postfix-19990906-pl09. + +1999/12/10 == Released 0.4.6 == + +1999/12/10 + - Realized changes implied below: Removed SSL_CTX_add_session() in the + client startup; remove session on stop with SSL_SESSION_free(). + - In the morning there is a mail on the list, that Postfix might be + crashed with a single "\" on the "CC:" line. Hence, we should expect + a new patchlevel soon. Release the actual change anyway. + +1999/12/09 + - Read in the "openssl-users" mailing list, that SSL_CTX_add_session() + is only intended for servers. On the client side, SSL_set_session() + is sufficient. + Additionally, the session should be explicitely freed, since + SSL_set_session() will increment the usage count for the session. + Explained by Bodo Moeller. + +1999/12/xx + - Had a discussion (by email) with Bodo Moeller about DH/DSS. It seems + I understand better now (after the discussion) how it works :-). + Implementing it should not be too difficult but might take some more + hours. Mentally scheduled it for Version "0.5.0" whenever this might + be (rough guess: christmas vacation). + Decided to hence not discuss this topic in the docs, since it might + change in the near future anyway. + +1999/11/23 + - Discussion with rch@writeme.com (Richard) about implementing DH ciphers + and DSA keys and certificates on the Postfix/TLS list: It does not work + as of now. + +1999/11/15 == Released 0.4.5 == + +1999/11/15 + - Applied patch to postfix-19990906-pl07 without problems. Well, let's + release new version of Postfix/TLS, so that we look up to date. + - Add the "DO NOT EDIT THIS FILE" to conf/sample-tls.cf. + +1999/11/08 + - Applied patch to the fresh release of postfix-19990906-pl06 without + problems. Nothing else, so no new release of Postfix/TLS. + +1999/11/07 == Released 0.4.4 == + +1999/11/07 + - Played around some more with the X509_verify_cert() function: when saving + a session, neither the verify_result is saved nor the certificate chain + necessary to re-verify. So there were two possibilities left: do a full + renegotiation negating the benefit of session caching or + - save the verify_result into to the session cache file and set the value + when rereading from disk. This way the positive result of session caching + is kept. + - Make sure, the verify_result value is propagated as pfixtls_peer_verified + and used where needed. + - After experiencing some failures at TLS connection setup, the SSL_sessions + are now freed again when closing. It seems, something is left over in the + session structures, even though SSL_clear() is called. + +1999/11/06 + - When not asking for a client certificate, the "Received:" header will show + the protocol and cipher, but silently omit the client CN (because they + where not supplied). Noted by Craig Sanders <craig@taz.net.au>. + The same holds, if a certificate is asked for, but none supplied. + Now, in any case an appropriate information is added in the "Received:" + header. + - Added a hint to remove sessions from the cache during testing, since + old information may still be in the cache. Also proposed by Craig + Sanders <craig@taz.net.au>. + - While at it: client CN and issuer CN are printed, but the verification + state is not, so that the trust value of this data is not known. + * Added (verify OK/not verified) to the Received: header. + * Obtained information using the SSL_get_verify_result(SSL *con) call. + * Learned, that the state is not saved in the session information, so + that a recalled old session will always return "OK" even if the + certificate failed the verification! Call it a bug in OpenSSL. + Still investigating on a good way to work around this problem. + - Fixed a bug in the syslog entries: The client CN is logged, but the + issuer CN is not, because of a missing "%s" in the format string. + +1999/11/03 == Released 0.4.3 == + +1999/11/03 + - Added some hints about security to the html documentation. + - Tested the changes made two weeks ago at home in the large university + setup. I was to a conference in between and didn't want to release + the new version without having done some more tests. + +1999/10/17 + - Added another half a ton of comments (this time for the client side), + yielding one ton alltogether... + +1999/10/16 + - Rearranged some of the TLS-engine initialization to improve readability. + - Do not "free" the SSL connection, when it is not really necessary. Do only + reset information about the TLS connection, when there was one. This is + the better way instead of the quick fix applied for 0.4.2. + - Added half a ton of comments to the TLS code (server side) to document + what is done when and why, since there is no real documentation about + the OpenSSL library. + +1999/10/11 == Released 0.4.2 == + +1999/10/11 + - Fixed a severe bug introduced in 0.4.0: smtpd and smtp tried to flush + old session from the session cache even when TLS was not enabled. Since + no SSL-context was allocated, smtp would segfault on connection close. + +1999/10/10 == Released 0.4.1 == + +1999/10/10 + - Added a long description of the session cache handling to the top of + global/pfixtls.c. + - There is a race condition when cleaning up the session cache in qmgr, that + might lead to lost sessions in client mode. The worst consequence is an + additional session negotiation, so we can live with it as of now. + Bug described in qmgr/qmgr_tls.c. + - Implemented immediate removal of session cache files with expired sessions + when these are called. No need to first load and then discard them. + - Implemented the requirement from RFC2246 to remove sessions, when + connection failures occure (well actually, when TLS layer failures + occur, but I cannot seperate this from another) for the server side. + the client side is under work. + +1999/10/09 + - Set an absolut maximum length of 32 for the IDs used for session caching. + This matches the default in OpenSSL, but I don't want to see surprises + when somebody sometimes will run into a longer session id. + +1999/10/05 == Released 0.4.0 == + - The new disk based session cache is a major step, so the minor release + number is pushed to 0.4. + - By now I think all necessary bells and whistles are in the code. What + is left is a big code cleanup and some more testing before calling this + patchkit "1.0.0". + - Initiated Mailing List at + http://www.aet.tu-cottbus.de/mailman/listinfo/postfix_tls + +1999/10/05 + - Some code cleanup. + - Added new options to the documentation and the hint to update + "postfix-script", because otherwise qmgr might fail! + +1999/10/03 + - Realized disc based session caching also for the Postfix/TLS client. + Must go to real world testing now between hosts. + And, of course, tune up the documentation, because users will have to + install a new postfix-script, too. + +1999/10/02 + - The old sessions must be removed once they have timed out, so a process + is needed that will scan through the list of old sessions and remove + once they have expired. + Lucky me: this is what qmgr usually does with deferred messages, so + qmgr is extended only a little bit and will now also clean up the + old sessions from the cache directory. + And hey: it is good to see how easily this thing can be extended and + functions can easily be reused. Postfix is an excellent peace of + software engineering and there is no line of C++ or other "object + oriented modern junk" in it. It should be recommended as an example + to computer sience students. + +1999/09/28 + - I cannot use the mod_ssl way for session caching and I don't want to + spend an extra "gcache" daemon as ApacheSSL does. So I follow Wietse's + idea realized for his mail queues and create hash level based subdirectory + structures. The good thing: I can cannibalize the mail_queue code. + The bad thing: there is a path length of 100 chars fix coded in Wietse's + routines. It does hold for 32byte session ideas. + Status: can save sessions to disk and recall them (server side). + +1999/09/26 + - Created new call backs for external session caching for the server side. + In a first step, they can print out the session ids for the newly created + session and when recalling a session. + As the OpenSSL documentation on this is pretty sparse, Ben Laurie's + ApacheSSL code is very helpful, Ralph Engelschall's Mod_SSL code for + session caching is far more complicated. + +1999/09/23 == Released 0.3.10 == + +1999/09/23 + - Debugging for 0.3.8/0.3.9 would have been so much easier, if the error + messages put onto the error message stack from the OpenSSL library would + have been printed out. The error was clearly stated from the library, I + just didn't print it. Added pfixtls_print_errors() calls where missing + after calls to the OpenSSL library. + Sometimes I feel so old... + - Used opportunity to upgrade to the latest postfix patchlevel 05: + postfix-19990906-pl05. + +1999/09/19 == Released 0.3.9 == + +1999/09/19 + - Added a "smtp_no_tls_sites" table to allow people to enable TLS negotiation + globally and only omit it on a per site basis. + +1999/09/18 + - Finally found the bug described for 0.3.8: In the server setup, the + SSL_CTX_set_session_id_context() call was missing. To find this, I + had to trace through the OpenSSL library and when I finally found it + in ssl/ssl_sess.c, there was an appropriate comment about this. I however + have to find out why I didn't receive the appropriate error message... + - This bug was hidden during the first developing stages, as the shutdown + sequence was not working correct, so the session was not cached. + +1999/09/17 == Released 0.3.8 == + +1999/09/17 + - Something is strange with the session caching in smtpd server mode + with Netscape 4.61 client. The first connection is fine, the next + one hangs after the server fails with errors while reading the + SSLv3 client hello C. (Found by Michael Stroeder <x_mst@propack-data.de>) + Reproducable with OpenSSL 0.9.3a, 0.9.4 and SNAPSHOT 19990915, so + the problem seems to be persistent. I will try to figure out the + problem myself before reporting it to the developers. If I don't find + it, maybe they do :-) + Workaround: the cached session is removed after connection is closed. + This will impose some time penalty on the negotiation. As the caching + is local in the smtp processes and they time out anyway, the penalty + should not be significant. + The problem does not occure with Postfix/TLS clients. + +1999/09/13 == Released 0.3.7 == + +1999/09/13 + - Ran tests, seems no further conflicts between Wietse's changes and my + extensions. + +1999/09/09 + - Applied the patchkit 0.3.6 to postfix-19990906-pl02 and worked out + the rejected part of the patch. From this point of view the patch + is included. Now everything has to be retested. + +1999/09/09 == Released 0.3.6 == + +1999/09/09 + - Added a missing '#ifdef HAS_SSL #endif' in smtp_connect.c. + Noted by Jeff Johnson <jeff@websitefactory.net>. + - HINT: + On 1999/09/06 a new "stable" version of postfix was released. + Future Postfix/TLS enhancements will be against this new version 19990906. + +1999/08/25 == Released 0.3.5 == + +1999/08/25 + - Added Wietse's patch for postfix-19990601 to prevent crashing smtpd when + VRFY is called without setting the sender with "MAIL FROM:" first. + +1999/08/13 + - Small changes to global/pfixtls.[ch]: Since we also support client STARTLS, + we check the peers certificate, which may also be a "server" certificate + (not just client). Hence I renamed "*ccert*" to "*peer*". + - global/pfixtls.c: add some "const" to "char *" for OpenSSL library calls, + to make gcc happy. + - Extended comments in pfixtls.[ch] to better match Wietse's style. + +1999/08/12 == Released 0.3.4 == + +1999/08/12 + - Enabled workarounds for known bugs in SSL-engines. + - Tested with OpenSSL 0.9.4. + - Windows95/NT: Problem with Netscape hanging on first connection when + the client certificate database has to be unlocked cannot be reproduced + anymore. + I am happy, but I am also not sure what caused the problem to go away + and I cannot figure out the security settings manually from the files... + +1999/08/11 + - Corrected loglevel handling: At some points smtpd_tls_loglevel was used + instead of smtp_tls_loglevel (only noted at loglevels >= 2). + +1999/08/09 == Released 0.3.3 == + +1999/08/09 + - Removed SSL_CTX_set_quiet_shutdown() as it does prevent the shutdown + from actually being performed. In order to remove the annoying + "SSL3 alert write:warning:close notify" it is now explicitly handled + in apps_ssl_info_callback(). + Bug found by Bodo Moeller <bodo@openssl.org>. + +1999/08/06 == Released 0.3.2 == + +1999/08/06 + - Add option "smtp_tls_note_starttls_offer" to collect information about + hosts, that offered the STARTTLS feature without using it. + - Shut up smtpd. Only print information about relaying based on certs + when msg_verbose is true. + +1999/07/20 + - Added missing "const" in pfixtls.h (found by Juergen Scheiderer + <jnschei@suse.de>). HP-UX ANSI-C didn't complain. + +1999/07/08 == Released 0.3.1 == + +1999/07/08 + - New config variable "smtpd_tls_received_header". When "true", the protocol + and cipher data as well as subject and issuer CN of the client certificate + are included into the "Received:" header. + +1999/07/07 + - "starting TLS engine" message will only be printed when loglevel >=2 + to reduce unnecessary noise in the log files. + - Added code to fetch the protocol (e.g. TLSv1) and the cipher used (by name + and bits). Information is printed to the logfile. + +1999/07/01 == Released 0.3.0 == + +1999/07/01 + - (Client mode) Bug fix: Don't try to use STARTTLS if it is not offered. The + server we are connected to might not understand it and respond with a + "500 command not understood", causing the email to bounce back, even + when the lack of STARTTLS is just a temporary problem. + - Updated documentation for the new per recipient/site TLS decisions. + +1999/06/30 + - Client mode: Added variables and routines to decide "per recipient" or + "per host/site" whether to use/enforce TLS or not. + +1999/06/18 == Released 0.2.8 == + +1999/06/18 + - In client mode the "use_tls" and "enforce_tls" internal variables were + not initialized correctly, such that the client could try to use the + STARTTLS negotiation even if not wanted. This error was introduced + in 0.2.7. + Noted by "Cerebus" <cerebus@sackheads.org>. + +1999/06/08 == Released 0.2.7 == + +1999/06/08 + - Studied discussions in the IETF-apps-TLS mailing list: MS Exchange + seems to offer STARTTLS even if not configured. Added this info to the + documentation. + - Updated Documentation regarding the changes made. + +1999/06/03 + - The subject-CommonName (CN) of the server certificate is extracted when + connecting to a TLS server. + - In "smtp_*_tls" mode, this subject-CommonName is matched against the + hostname of the server. In "enforce" mode, the connection is droppend + when the certified server name and the real hostname differ. + - Added missing dependencies in smtp/Makefile.in (missing pfixtls.h since + 0.2.0). + +1999/06/02 == Released 0.2.6 == + +1999/06/02 + - Adapted patchkit to postfix-19990601. + +1999/06/01 == Released 0.2.5 == + +1999/06/01 + - Updated OpenSSL API to 0.9.3a -> position of include files has changed + from <xxx.h> to <openssl/xxx.h>. No functional changes. + - pkcs12 utility is now part of OpenSSL -> changed documentation + accordingly. + +1999/05/20 == Released 0.2.4 == + +1999/05/20 + - Updated postfix base 19990317 from pl04 to pl05. + +1999/05/14 == Released 0.2.3 == + +1999/05/14 + - Fixed a bug in pfixtls_stop_*(): there was a ";" to much directly + after "if (con);". This check is only done as a safety measure: + When SSL is not started you should not stop it. This case could however + only happen when the code in smtp[d] would be wrong, so it should never + be necessary. (Bug found by Uwe Ohse <uwe@ohse.de>) + +1999/05/11 == Released 0.2.2 == + +1999/05/11 + - Matti Aarnio: Reworked pfixtls_dump() to use fewer strcpy and strcat calls. + - Added information about Matti Aarnio (author/maintainer of ZMailer) + working on RFC2487 for ZMailer. + +1999/05/04 == Released 0.2.1 == + +1999/05/04 + - Stuffed up the documenation to reflect the actual status. No change + in functionality. + +1999/04/30 == Released 0.2.0 == + +1999/04/30 + - Adjusted the changes in smtp*.c to Wietse's indentation style. + - Sorry, the documentation about the client side has by now to be + taken from sample-tls.conf. The documenation has to be rearranged + in a larger scale. + +1999/04/29 + - Finished client support for STARTTLS in smtp; some testing done. + - Fixed a race condition in smtpd: When in PIPELINE mode, the connection + was switched back from SSL to normal mode before the buffers were + flashed. + - Adjusted the code in pfixtls.[ch] and additions in smtpd*.c to + Wietse's indentation style. + +1999/04/28 + - Incorporated skeleton of STARTTLS support into smtp. + - Introduced variables to control client STARTTLS to configuration. + +1999/04/15 == Released 0.1.5 == + +1999/04/15 + - Adjusted pfixtls.diff to postfix-19990317-pl04. + +1999/04/14 + - Ported from OpenSSL the BIO_callback functions to dump out the negotiation + and transmission for debugging purposes. The functions are triggered + by the new loglevels 3 and 4. + - Call SSL_free() to get rid of the SSL connection structure not used + anymore. + +1999/04/13 == Released 0.1.4 == + +1999/04/13 + - Based on a hint in the openssl-users list added an SSL_set_accept_state() + before the actual SSL_accept(). I don't really understand why, but the + documentation of SSL is a bit short anyway. + +1999/04/11 + - Some more comments on certificates in the documentation. + +1999/04/10 + - Moved initialization of the pfixtls_server_engine to the pre_jail_init() + section of smtpd, so that it is called with root privileges to read the + key and cert information. The secret key of the server can now be protected + by "chown root secretkey.pem; chmod 400 secretkey.pem". + Additionally, this makes it possible to run smtpd in chroot jail, even + though I didn't test that, yet. All information is read at smtpd startup + time except the CAcerts in tls_CApath, which are checked at runtime. + I have to look into that. + - Updated documentation accordingly. + - Rewrote the documentation with regard to the certificate setup and + explaining the different types of certificates. + +1999/04/09 + - Introduced pfixtls_print_errors() which imitates BIO_print_errors() + (the typical way to print error information in OpenSSL) but writes + to syslog instead of a file handle. + Hence we can get more informative error information. + +1999/04/08 == Released 0.1.3 == + +1999/04/08 + - Stuffed up the documentation by reworking the references. + - Added contributed script for automatic addition of fingerprints. + - Added ACKNOWLEDGEMENTS file + +1999/04/06 == Released 0.1.2 == + +1999/04/06 + - Portability: removed call of "snprintf()", as it is not available on + some (older) UNIX versions (in this case Solaris 2.5). + - Removed calls to "select()" when in TLS mode: Even though no new bytes + arrive, there might be bytes left in the SSL buffer -> possible hang. + +1999/03/30 == Released 0.1.1 == + +1999/03/30 + - Added disclaimer about export restrictions. + - Fixed a bug in util/match_ops.c: + When using dictionary lookup the compare was case sensitive by accident. + Effect: Fingerprint matching did not work with databases, only for plain + file. + Bug report submitted to postfix author. + +1999/03/29 == Released first version 0.1.0 == |