From: Wietse Venema Date: Sun, 4 Nov 2018 05:00:00 +0000 (-0500) Subject: postfix-3.2.7-RC1 X-Git-Tag: v3.2.7-RC1^0 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aef1057b7711060543548e44784044bd08dbf24b;p=thirdparty%2Fpostfix.git postfix-3.2.7-RC1 --- diff --git a/postfix/HISTORY b/postfix/HISTORY index 5397ee80e..9cd2f09ff 100644 --- a/postfix/HISTORY +++ b/postfix/HISTORY @@ -23092,3 +23092,20 @@ Apologies for any names omitted. error propagation in tlsproxy(8) resulting in segfault after TLS handshake error. Found during code maintenance. File: tlsproxy/tlsproxy.c. + +20180617 + + Bugfix (introduced: Postfix 2.11): minor memory leak when + minting issuer certs. This affects a tiny minority of use + cases. Viktor Dukhovni, based on a fix by Juan Altmayer + Pizzorno for the ssl_dane library. + +20181104 + + Multiple 'bit rot' fixes for OpenSSL API changes, including + support to disable TLSv1.3, to avoid issuing multiple session + tickets, and to allow OpenSSL >= 1.1.0 run-time micro version + bumps without complaining about library version mismatches. + Viktor Dukhovni. Files: proto/postconf.proto, + proto/TLS_README.html, tls/tls.h, tls/tls_dane.c, + tls/tls_server.c, tls/tls_misc.c. diff --git a/postfix/README_FILES/TLS_README b/postfix/README_FILES/TLS_README index 8a328b262..c37539541 100644 --- a/postfix/README_FILES/TLS_README +++ b/postfix/README_FILES/TLS_README @@ -668,11 +668,12 @@ Example: smtpd_starttls_timeout = 300s With Postfix 2.8 and later, the tls_disable_workarounds parameter specifies a -list or bit-mask of OpenSSL bug work-arounds to disable. This may be necessary -if one of the work-arounds enabled by default in OpenSSL proves to pose a -security risk, or introduces an unexpected interoperability issue. Some bug -work-arounds known to be problematic are disabled in the default value of the -parameter when linked with an OpenSSL library that could be vulnerable. +list or bit-mask of default-enabled OpenSSL bug work-arounds to disable. This +may be necessary if one of the work-arounds enabled by default in OpenSSL +proves to pose a security risk, or introduces an unexpected interoperability +issue. The list of enabled bug work-arounds is OpenSSL-release-specific. See +the tls_disable_workarounds parameter documentation for the list of supported +values. Example: @@ -685,16 +686,9 @@ mask of OpenSSL options to enable. Specify one or more of the named options below, or a hexadecimal bitmask of options found in the ssl.h file corresponding to the run-time OpenSSL library. While it may be reasonable to turn off all bug workarounds (see above), it is not a good idea to attempt to -turn on all features. +turn on all features. See the tls_ssl_options parameter documentation for the +list of supported values. -LLEEGGAACCYY__SSEERRVVEERR__CCOONNNNEECCTT - See SSL_CTX_set_options(3). -NNOO__TTIICCKKEETT - See SSL_CTX_set_options(3). -NNOO__CCOOMMPPRREESSSSIIOONN - Disable SSL compression even if supported by the OpenSSL library. - Compression is CPU-intensive, and compression before encryption does not - always improve security. Example: /etc/postfix/main.cf: diff --git a/postfix/html/TLS_README.html b/postfix/html/TLS_README.html index 9efbb519d..8777fe72a 100644 --- a/postfix/html/TLS_README.html +++ b/postfix/html/TLS_README.html @@ -933,12 +933,13 @@ handshake procedures.

With Postfix 2.8 and later, the tls_disable_workarounds parameter -specifies a list or bit-mask of OpenSSL bug work-arounds to disable. This -may be necessary if one of the work-arounds enabled by default in -OpenSSL proves to pose a security risk, or introduces an unexpected -interoperability issue. Some bug work-arounds known to be problematic -are disabled in the default value of the parameter when linked with -an OpenSSL library that could be vulnerable.

+specifies a list or bit-mask of default-enabled OpenSSL bug +work-arounds to disable. This may be necessary if one of the +work-arounds enabled by default in OpenSSL proves to pose a security +risk, or introduces an unexpected interoperability issue. The list +of enabled bug work-arounds is OpenSSL-release-specific. See the +tls_disable_workarounds parameter documentation for the list of +supported values.

Example:

@@ -956,19 +957,8 @@ more of the named options below, or a hexadecimal bitmask of options found in the ssl.h file corresponding to the run-time OpenSSL library. While it may be reasonable to turn off all bug workarounds (see above), it is not a good idea to attempt to turn on all features. -

- -
- -
LEGACY_SERVER_CONNECT
See SSL_CTX_set_options(3).
- -
NO_TICKET
See SSL_CTX_set_options(3).
- -
NO_COMPRESSION
Disable SSL compression even if -supported by the OpenSSL library. Compression is CPU-intensive, -and compression before encryption does not always improve security.
- -
+See the tls_ssl_options parameter documentation for the list of +supported values.

Example:

diff --git a/postfix/html/mailq.1.html b/postfix/html/mailq.1.html index 802169364..fa4e4828a 100644 --- a/postfix/html/mailq.1.html +++ b/postfix/html/mailq.1.html @@ -434,7 +434,7 @@ SENDMAIL(1) SENDMAIL(1) alternate_config_directories (empty) A list of non-default Postfix configuration directories that may be specified with "-c config_directory" on the command line (in - the case of sendmail(1), with "-C config_directory"), or via the + the case of sendmail(1), with the "-C" option), or via the MAIL_CONFIG environment parameter. multi_instance_directories (empty) diff --git a/postfix/html/newaliases.1.html b/postfix/html/newaliases.1.html index 802169364..fa4e4828a 100644 --- a/postfix/html/newaliases.1.html +++ b/postfix/html/newaliases.1.html @@ -434,7 +434,7 @@ SENDMAIL(1) SENDMAIL(1) alternate_config_directories (empty) A list of non-default Postfix configuration directories that may be specified with "-c config_directory" on the command line (in - the case of sendmail(1), with "-C config_directory"), or via the + the case of sendmail(1), with the "-C" option), or via the MAIL_CONFIG environment parameter. multi_instance_directories (empty) diff --git a/postfix/html/postconf.5.html b/postfix/html/postconf.5.html index bdeffc8d5..95c472af0 100644 --- a/postfix/html/postconf.5.html +++ b/postfix/html/postconf.5.html @@ -12388,8 +12388,10 @@ matches the underlying OpenSSL interface semantics.

The range of protocols advertised by an SSL/TLS client must be contiguous. When a protocol version is enabled, disabling any -higher version implicitly disables all versions above that higher -version. Thus, for example:

+higher version implicitly disables all versions above that higher version. +Thus, for example (assuming the OpenSSL library supports both SSLv2 +and SSLv3): +

 smtp_tls_mandatory_protocols = !SSLv2, !TLSv1
@@ -12406,6 +12408,9 @@ disabled except by also disabling "TLSv1" (typically leaving just
 versions of Postfix ≥ 2.10 can explicitly disable support for
 "TLSv1.1" or "TLSv1.2". 

 
+
 OpenSSL 1.1.1 introduces support for "TLSv1.3".  With Postfix ≥ 3.4,
+this can be disabled, if need be, via "!TLSv1.3". 

+
 
 At the dane and
 dane-only security
 levels, when usable TLSA records are obtained for the remote SMTP
@@ -12718,11 +12723,13 @@ and "TLSv1". 

 
 
 The range of protocols advertised by an SSL/TLS client must be
 contiguous.  When a protocol version is enabled, disabling any
-higher version implicitly disables all versions above that higher
-version.  Thus, for example: 

+higher version implicitly disables all versions above that higher version.
+Thus, for example (assuming the OpenSSL library supports both SSLv2
+and SSLv3):
+

 

 
-smtp_tls_mandatory_protocols = !SSLv2, !TLSv1
+smtp_tls_protocols = !SSLv2, !TLSv1
 

 

 
 also disables any protocols version higher than TLSv1 leaving
@@ -12733,6 +12740,9 @@ and "TLSv1.2". The latest patch levels of Postfix ≥ 2.6, and all
 versions of Postfix ≥ 2.10 can explicitly disable support for
 "TLSv1.1" or "TLSv1.2"

 
+
 OpenSSL 1.1.1 introduces support for "TLSv1.3".  With Postfix ≥ 3.4,
+this can be disabled, if need be, via "!TLSv1.3". 

+
 
 To include a protocol list its name, to exclude it, prefix the name
 with a "!" character. To exclude SSLv2 for opportunistic TLS set
 "smtp_tls_protocols = !SSLv2". To exclude both "SSLv2" and "SSLv3" set
@@ -16839,6 +16849,9 @@ disabled.  The latest patch levels of Postfix ≥ 2.6, and all
 versions of Postfix ≥ 2.10 can disable support for "TLSv1.1" or
 "TLSv1.2". 

 
+
 OpenSSL 1.1.1 introduces support for "TLSv1.3".  With Postfix ≥ 3.4,
+this can be disabled, if need be, via "!TLSv1.3". 

+
 
 Example: 

 
 
@@ -16870,6 +16883,9 @@ and "TLSv1.2". The latest patch levels of Postfix ≥ 2.6, and all
 versions of Postfix ≥ 2.10 can disable support for "TLSv1.1" or
 "TLSv1.2". 

 
+
 OpenSSL 1.1.1 introduces support for "TLSv1.3".  With Postfix ≥ 3.4,
+this can be disabled, if need be, via "!TLSv1.3". 

+
 
 To include a protocol list its name, to exclude it, prefix the name
 with a "!" character. To exclude SSLv2 for opportunistic TLS set
 "smtpd_tls_protocols = !SSLv2". To exclude both "SSLv2" and "SSLv3" set
@@ -17609,44 +17625,46 @@ you can only disable one of these via the hexadecimal syntax above. 

 
 

 
-
MICROSOFT_SESS_ID_BUG
 
See SSL_CTX_set_options(3)

+
CRYPTOPRO_TLSEXT_BUG
 
New with GOST support in
+OpenSSL 1.0.0.

 
-
NETSCAPE_CHALLENGE_BUG
 
See SSL_CTX_set_options(3)

+
DONT_INSERT_EMPTY_FRAGMENTS
 
See
+SSL_CTX_set_options(3)

 
 
LEGACY_SERVER_CONNECT
 
See SSL_CTX_set_options(3)

 
-
NETSCAPE_REUSE_CIPHER_CHANGE_BUG
 
 also aliased
-as CVE-2010-4180. Postfix 2.8 disables this work-around by
-default with OpenSSL versions that may predate the fix. Fixed in
-OpenSSL 0.9.8q and OpenSSL 1.0.0c.

-
-
SSLREF2_REUSE_CERT_TYPE_BUG
 
See
-SSL_CTX_set_options(3)

-
 
MICROSOFT_BIG_SSLV3_BUFFER
 
See
 SSL_CTX_set_options(3)

 
+
MICROSOFT_SESS_ID_BUG
 
See SSL_CTX_set_options(3)

+
 
MSIE_SSLV2_RSA_PADDING
 
 also aliased as
 CVE-2005-2969. Postfix 2.8 disables this work-around by
 default with OpenSSL versions that may predate the fix. Fixed in
 OpenSSL 0.9.7h and OpenSSL 0.9.8a.

 
+
NETSCAPE_CHALLENGE_BUG
 
See SSL_CTX_set_options(3)

+
+
NETSCAPE_REUSE_CIPHER_CHANGE_BUG
 
 also aliased
+as CVE-2010-4180. Postfix 2.8 disables this work-around by
+default with OpenSSL versions that may predate the fix. Fixed in
+OpenSSL 0.9.8q and OpenSSL 1.0.0c.

+
 
SSLEAY_080_CLIENT_DH_BUG
 
See
 SSL_CTX_set_options(3)

 
-
TLS_D5_BUG
 
See SSL_CTX_set_options(3)

+
SSLREF2_REUSE_CERT_TYPE_BUG
 
See
+SSL_CTX_set_options(3)

 
 
TLS_BLOCK_PADDING_BUG
 
See SSL_CTX_set_options(3)

 
+
TLS_D5_BUG
 
See SSL_CTX_set_options(3)

+
 
TLS_ROLLBACK_BUG
 
See SSL_CTX_set_options(3).
 This is disabled in OpenSSL 0.9.7 and later. Nobody should still
 be using 0.9.6! 

 
-
DONT_INSERT_EMPTY_FRAGMENTS
 
See
-SSL_CTX_set_options(3)

-
-
CRYPTOPRO_TLSEXT_BUG
 
New with GOST support in
-OpenSSL 1.0.0.

+
TLSEXT_PADDING
Postfix ≥ 3.4. See SSL_CTX_set_options(3).

 
 

 
@@ -18020,18 +18038,39 @@ in its value are enabled (see openssl/ssl.h and SSL_CTX_set_options(3)).
 You can only enable options not already controlled by other Postfix
 settings.  For example, you cannot disable protocols or enable
 server cipher preference.  Do not attempt to turn all features by
-specifying 0xFFFFFFFF, this is unlikely to be a good idea.  

+specifying 0xFFFFFFFF, this is unlikely to be a good idea.  Some
+bug work-arounds are also valid here, allowing them to be re-enabled
+if/when they're no longer enabled by default.  The supported values
+include: 

 
 

 
+
ENABLE_MIDDLEBOX_COMPAT
 
Postfix ≥ 3.4. See
+SSL_CTX_set_options(3).

+
 
LEGACY_SERVER_CONNECT
 
See SSL_CTX_set_options(3).

 
-
NO_TICKET
 
See SSL_CTX_set_options(3).

+
NO_TICKET
 
Enabled by default when needed in
+fully-patched Postfix ≥ 2.7.  Not needed at all for Postfix ≥
+2.11, unless for some reason you do not want to support TLS session
+resumption.  Best not set explicitly.  See SSL_CTX_set_options(3).

 
 
NO_COMPRESSION
 
Disable SSL compression even if
 supported by the OpenSSL library.  Compression is CPU-intensive,
 and compression before encryption does not always improve security.  

 
+
NO_RENEGOTIATION
 
Postfix ≥ 3.4.  This can
+reduce opportunities for a potential CPU exhaustion attack.  See
+SSL_CTX_set_options(3).

+
+
NO_SESSION_RESUMPTION_ON_RENEGOTIATION
 
Postfix
+≥ 3.4. See SSL_CTX_set_options(3).

+
+
PRIORITIZE_CHACHA
 
Postfix ≥ 3.4. See SSL_CTX_set_options(3).

+
+
TLSEXT_PADDING
 
Postfix ≥ 3.4. See
+SSL_CTX_set_options(3).

+
 

 
 
 This feature is available in Postfix 2.11 and later.  

diff --git a/postfix/html/sendmail.1.html b/postfix/html/sendmail.1.html
index 802169364..fa4e4828a 100644
--- a/postfix/html/sendmail.1.html
+++ b/postfix/html/sendmail.1.html
@@ -434,7 +434,7 @@ SENDMAIL(1)                                                        SENDMAIL(1)
        alternate_config_directories (empty)
               A list of non-default Postfix configuration directories that may
               be specified with "-c config_directory" on the command line  (in
-              the case of sendmail(1), with "-C config_directory"), or via the
+              the  case  of  sendmail(1),  with  the  "-C" option), or via the
               MAIL_CONFIG environment parameter.
 
        multi_instance_directories (empty)
diff --git a/postfix/man/man1/sendmail.1 b/postfix/man/man1/sendmail.1
index 091f053ff..e51ed4c2f 100644
--- a/postfix/man/man1/sendmail.1
+++ b/postfix/man/man1/sendmail.1
@@ -416,7 +416,7 @@ Postfix 3.2 and later:
 .IP "\fBalternate_config_directories (empty)\fR"
 A list of non\-default Postfix configuration directories that may
 be specified with "\-c config_directory" on the command line (in the
-case of \fBsendmail\fR(1), with "\-C config_directory"), or via the MAIL_CONFIG
+case of \fBsendmail\fR(1), with the "\-C" option), or via the MAIL_CONFIG
 environment parameter.
 .IP "\fBmulti_instance_directories (empty)\fR"
 An optional list of non\-default Postfix configuration directories;
diff --git a/postfix/man/man5/postconf.5 b/postfix/man/man5/postconf.5
index ffecdf307..dd0efa69a 100644
--- a/postfix/man/man5/postconf.5
+++ b/postfix/man/man5/postconf.5
@@ -7952,8 +7952,9 @@ matches the underlying OpenSSL interface semantics.
 .PP
 The range of protocols advertised by an SSL/TLS client must be
 contiguous.  When a protocol version is enabled, disabling any
-higher version implicitly disables all versions above that higher
-version.  Thus, for example:
+higher version implicitly disables all versions above that higher version.
+Thus, for example (assuming the OpenSSL library supports both SSLv2
+and SSLv3):
 .sp
 .in +4
 .nf
@@ -7975,6 +7976,9 @@ disabled except by also disabling "TLSv1" (typically leaving just
 versions of Postfix >= 2.10 can explicitly disable support for
 "TLSv1.1" or "TLSv1.2".
 .PP
+OpenSSL 1.1.1 introduces support for "TLSv1.3".  With Postfix >= 3.4,
+this can be disabled, if need be, via "!TLSv1.3".
+.PP
 At the dane and
 dane\-only security
 levels, when usable TLSA records are obtained for the remote SMTP
@@ -8270,14 +8274,15 @@ and "TLSv1".
 .PP
 The range of protocols advertised by an SSL/TLS client must be
 contiguous.  When a protocol version is enabled, disabling any
-higher version implicitly disables all versions above that higher
-version.  Thus, for example:
+higher version implicitly disables all versions above that higher version.
+Thus, for example (assuming the OpenSSL library supports both SSLv2
+and SSLv3):
 .sp
 .in +4
 .nf
 .na
 .ft C
-smtp_tls_mandatory_protocols = !SSLv2, !TLSv1
+smtp_tls_protocols = !SSLv2, !TLSv1
 .fi
 .ad
 .ft R
@@ -8290,6 +8295,9 @@ and "TLSv1.2". The latest patch levels of Postfix >= 2.6, and all
 versions of Postfix >= 2.10 can explicitly disable support for
 "TLSv1.1" or "TLSv1.2"
 .PP
+OpenSSL 1.1.1 introduces support for "TLSv1.3".  With Postfix >= 3.4,
+this can be disabled, if need be, via "!TLSv1.3".
+.PP
 To include a protocol list its name, to exclude it, prefix the name
 with a "!" character. To exclude SSLv2 for opportunistic TLS set
 "smtp_tls_protocols = !SSLv2". To exclude both "SSLv2" and "SSLv3" set
@@ -11562,6 +11570,9 @@ disabled.  The latest patch levels of Postfix >= 2.6, and all
 versions of Postfix >= 2.10 can disable support for "TLSv1.1" or
 "TLSv1.2".
 .PP
+OpenSSL 1.1.1 introduces support for "TLSv1.3".  With Postfix >= 3.4,
+this can be disabled, if need be, via "!TLSv1.3".
+.PP
 Example:
 .PP
 .nf
@@ -11591,6 +11602,9 @@ and "TLSv1.2". The latest patch levels of Postfix >= 2.6, and all
 versions of Postfix >= 2.10 can disable support for "TLSv1.1" or
 "TLSv1.2".
 .PP
+OpenSSL 1.1.1 introduces support for "TLSv1.3".  With Postfix >= 3.4,
+this can be disabled, if need be, via "!TLSv1.3".
+.PP
 To include a protocol list its name, to exclude it, prefix the name
 with a "!" character. To exclude SSLv2 for opportunistic TLS set
 "smtpd_tls_protocols = !SSLv2". To exclude both "SSLv2" and "SSLv3" set
@@ -12106,57 +12120,60 @@ of specific named bug work\-arounds chosen from the list below. It
 is possible that your OpenSSL version includes new bug work\-arounds
 added after your Postfix source code was last updated, in that case
 you can only disable one of these via the hexadecimal syntax above.
-.IP "\fBMICROSOFT_SESS_ID_BUG\fR"
-See SSL_CTX_\fBset_options\fR(3)
+.IP "\fBCRYPTOPRO_TLSEXT_BUG\fR"
+New with GOST support in
+OpenSSL 1.0.0.
 .br
-.IP "\fBNETSCAPE_CHALLENGE_BUG\fR"
-See SSL_CTX_\fBset_options\fR(3)
+.IP "\fBDONT_INSERT_EMPTY_FRAGMENTS\fR"
+See
+SSL_CTX_\fBset_options\fR(3)
 .br
 .IP "\fBLEGACY_SERVER_CONNECT\fR"
 See SSL_CTX_\fBset_options\fR(3)
 .br
-.IP "\fBNETSCAPE_REUSE_CIPHER_CHANGE_BUG\fR"
-also aliased
-as \fBCVE\-2010\-4180\fR. Postfix 2.8 disables this work\-around by
-default with OpenSSL versions that may predate the fix. Fixed in
-OpenSSL 0.9.8q and OpenSSL 1.0.0c.
-.br
-.IP "\fBSSLREF2_REUSE_CERT_TYPE_BUG\fR"
-See
-SSL_CTX_\fBset_options\fR(3)
-.br
 .IP "\fBMICROSOFT_BIG_SSLV3_BUFFER\fR"
 See
 SSL_CTX_\fBset_options\fR(3)
 .br
+.IP "\fBMICROSOFT_SESS_ID_BUG\fR"
+See SSL_CTX_\fBset_options\fR(3)
+.br
 .IP "\fBMSIE_SSLV2_RSA_PADDING\fR"
 also aliased as
 \fBCVE\-2005\-2969\fR. Postfix 2.8 disables this work\-around by
 default with OpenSSL versions that may predate the fix. Fixed in
 OpenSSL 0.9.7h and OpenSSL 0.9.8a.
 .br
+.IP "\fBNETSCAPE_CHALLENGE_BUG\fR"
+See SSL_CTX_\fBset_options\fR(3)
+.br
+.IP "\fBNETSCAPE_REUSE_CIPHER_CHANGE_BUG\fR"
+also aliased
+as \fBCVE\-2010\-4180\fR. Postfix 2.8 disables this work\-around by
+default with OpenSSL versions that may predate the fix. Fixed in
+OpenSSL 0.9.8q and OpenSSL 1.0.0c.
+.br
 .IP "\fBSSLEAY_080_CLIENT_DH_BUG\fR"
 See
 SSL_CTX_\fBset_options\fR(3)
 .br
-.IP "\fBTLS_D5_BUG\fR"
-See SSL_CTX_\fBset_options\fR(3)
+.IP "\fBSSLREF2_REUSE_CERT_TYPE_BUG\fR"
+See
+SSL_CTX_\fBset_options\fR(3)
 .br
 .IP "\fBTLS_BLOCK_PADDING_BUG\fR"
 See SSL_CTX_\fBset_options\fR(3)
 .br
+.IP "\fBTLS_D5_BUG\fR"
+See SSL_CTX_\fBset_options\fR(3)
+.br
 .IP "\fBTLS_ROLLBACK_BUG\fR"
 See SSL_CTX_\fBset_options\fR(3).
 This is disabled in OpenSSL 0.9.7 and later. Nobody should still
 be using 0.9.6!
 .br
-.IP "\fBDONT_INSERT_EMPTY_FRAGMENTS\fR"
-See
-SSL_CTX_\fBset_options\fR(3)
-.br
-.IP "\fBCRYPTOPRO_TLSEXT_BUG\fR"
-New with GOST support in
-OpenSSL 1.0.0.
+.IP "\fBTLSEXT_PADDING\fR"
+Postfix >= 3.4. See SSL_CTX_\fBset_options\fR(3).
 .br
 .br
 .PP
@@ -12422,18 +12439,44 @@ in its value are enabled (see openssl/ssl.h and SSL_CTX_\fBset_options\fR(3)).
 You can only enable options not already controlled by other Postfix
 settings.  For example, you cannot disable protocols or enable
 server cipher preference.  Do not attempt to turn all features by
-specifying 0xFFFFFFFF, this is unlikely to be a good idea.
+specifying 0xFFFFFFFF, this is unlikely to be a good idea.  Some
+bug work\-arounds are also valid here, allowing them to be re\-enabled
+if/when they're no longer enabled by default.  The supported values
+include:
+.IP "\fBENABLE_MIDDLEBOX_COMPAT\fR"
+Postfix >= 3.4. See
+SSL_CTX_\fBset_options\fR(3).
+.br
 .IP "\fBLEGACY_SERVER_CONNECT\fR"
 See SSL_CTX_\fBset_options\fR(3).
 .br
 .IP "\fBNO_TICKET\fR"
-See SSL_CTX_\fBset_options\fR(3).
+Enabled by default when needed in
+fully\-patched Postfix >= 2.7.  Not needed at all for Postfix >=
+2.11, unless for some reason you do not want to support TLS session
+resumption.  Best not set explicitly.  See SSL_CTX_\fBset_options\fR(3).
 .br
 .IP "\fBNO_COMPRESSION\fR"
 Disable SSL compression even if
 supported by the OpenSSL library.  Compression is CPU\-intensive,
 and compression before encryption does not always improve security.
 .br
+.IP "\fBNO_RENEGOTIATION\fR"
+Postfix >= 3.4.  This can
+reduce opportunities for a potential CPU exhaustion attack.  See
+SSL_CTX_\fBset_options\fR(3).
+.br
+.IP "\fBNO_SESSION_RESUMPTION_ON_RENEGOTIATION\fR"
+Postfix
+>= 3.4. See SSL_CTX_\fBset_options\fR(3).
+.br
+.IP "\fBPRIORITIZE_CHACHA\fR"
+Postfix >= 3.4. See SSL_CTX_\fBset_options\fR(3).
+.br
+.IP "\fBTLSEXT_PADDING\fR"
+Postfix >= 3.4. See
+SSL_CTX_\fBset_options\fR(3).
+.br
 .br
 .PP
 This feature is available in Postfix 2.11 and later.
diff --git a/postfix/proto/TLS_README.html b/postfix/proto/TLS_README.html
index 9da081c72..f862e7599 100644
--- a/postfix/proto/TLS_README.html
+++ b/postfix/proto/TLS_README.html
@@ -933,12 +933,13 @@ handshake procedures.

With Postfix 2.8 and later, the tls_disable_workarounds parameter -specifies a list or bit-mask of OpenSSL bug work-arounds to disable. This -may be necessary if one of the work-arounds enabled by default in -OpenSSL proves to pose a security risk, or introduces an unexpected -interoperability issue. Some bug work-arounds known to be problematic -are disabled in the default value of the parameter when linked with -an OpenSSL library that could be vulnerable.

+specifies a list or bit-mask of default-enabled OpenSSL bug +work-arounds to disable. This may be necessary if one of the +work-arounds enabled by default in OpenSSL proves to pose a security +risk, or introduces an unexpected interoperability issue. The list +of enabled bug work-arounds is OpenSSL-release-specific. See the +tls_disable_workarounds parameter documentation for the list of +supported values.

Example:

@@ -956,19 +957,8 @@ more of the named options below, or a hexadecimal bitmask of options found in the ssl.h file corresponding to the run-time OpenSSL library. While it may be reasonable to turn off all bug workarounds (see above), it is not a good idea to attempt to turn on all features. -

- -
- -
LEGACY_SERVER_CONNECT
See SSL_CTX_set_options(3).
- -
NO_TICKET
See SSL_CTX_set_options(3).
- -
NO_COMPRESSION
Disable SSL compression even if -supported by the OpenSSL library. Compression is CPU-intensive, -and compression before encryption does not always improve security.
- -
+See the tls_ssl_options parameter documentation for the list of +supported values.

Example:

diff --git a/postfix/proto/postconf.proto b/postfix/proto/postconf.proto index 8394f75c6..85d534cb5 100644 --- a/postfix/proto/postconf.proto +++ b/postfix/proto/postconf.proto @@ -11146,8 +11146,10 @@ matches the underlying OpenSSL interface semantics.

The range of protocols advertised by an SSL/TLS client must be contiguous. When a protocol version is enabled, disabling any -higher version implicitly disables all versions above that higher -version. Thus, for example:

+higher version implicitly disables all versions above that higher version. +Thus, for example (assuming the OpenSSL library supports both SSLv2 +and SSLv3): +

 smtp_tls_mandatory_protocols = !SSLv2, !TLSv1
@@ -11164,6 +11166,9 @@ disabled except by also disabling "TLSv1" (typically leaving just
 versions of Postfix ≥ 2.10 can explicitly disable support for
 "TLSv1.1" or "TLSv1.2". 

 
+
 OpenSSL 1.1.1 introduces support for "TLSv1.3".  With Postfix ≥ 3.4,
+this can be disabled, if need be, via "!TLSv1.3". 

+
 
 At the dane and
 dane-only security
 levels, when usable TLSA records are obtained for the remote SMTP
@@ -11361,6 +11366,9 @@ disabled.  The latest patch levels of Postfix ≥ 2.6, and all
 versions of Postfix ≥ 2.10 can disable support for "TLSv1.1" or
 "TLSv1.2". 

 
+
 OpenSSL 1.1.1 introduces support for "TLSv1.3".  With Postfix ≥ 3.4,
+this can be disabled, if need be, via "!TLSv1.3". 

+
 
 Example: 

 
 
@@ -12502,11 +12510,13 @@ and "TLSv1". 

 
 
 The range of protocols advertised by an SSL/TLS client must be
 contiguous.  When a protocol version is enabled, disabling any
-higher version implicitly disables all versions above that higher
-version.  Thus, for example: 

+higher version implicitly disables all versions above that higher version.
+Thus, for example (assuming the OpenSSL library supports both SSLv2
+and SSLv3):
+

 

 
-smtp_tls_mandatory_protocols = !SSLv2, !TLSv1
+smtp_tls_protocols = !SSLv2, !TLSv1
 

 

 
 also disables any protocols version higher than TLSv1 leaving
@@ -12517,6 +12527,9 @@ and "TLSv1.2". The latest patch levels of Postfix ≥ 2.6, and all
 versions of Postfix ≥ 2.10 can explicitly disable support for
 "TLSv1.1" or "TLSv1.2"

 
+
 OpenSSL 1.1.1 introduces support for "TLSv1.3".  With Postfix ≥ 3.4,
+this can be disabled, if need be, via "!TLSv1.3". 

+
 
 To include a protocol list its name, to exclude it, prefix the name
 with a "!" character. To exclude SSLv2 for opportunistic TLS set
 "smtp_tls_protocols = !SSLv2". To exclude both "SSLv2" and "SSLv3" set
@@ -12549,6 +12562,9 @@ and "TLSv1.2". The latest patch levels of Postfix ≥ 2.6, and all
 versions of Postfix ≥ 2.10 can disable support for "TLSv1.1" or
 "TLSv1.2". 

 
+
 OpenSSL 1.1.1 introduces support for "TLSv1.3".  With Postfix ≥ 3.4,
+this can be disabled, if need be, via "!TLSv1.3". 

+
 
 To include a protocol list its name, to exclude it, prefix the name
 with a "!" character. To exclude SSLv2 for opportunistic TLS set
 "smtpd_tls_protocols = !SSLv2". To exclude both "SSLv2" and "SSLv3" set
@@ -14829,44 +14845,46 @@ you can only disable one of these via the hexadecimal syntax above. 

 
 

 
-
MICROSOFT_SESS_ID_BUG
 
See SSL_CTX_set_options(3)

+
CRYPTOPRO_TLSEXT_BUG
 
New with GOST support in
+OpenSSL 1.0.0.

 
-
NETSCAPE_CHALLENGE_BUG
 
See SSL_CTX_set_options(3)

+
DONT_INSERT_EMPTY_FRAGMENTS
 
See
+SSL_CTX_set_options(3)

 
 
LEGACY_SERVER_CONNECT
 
See SSL_CTX_set_options(3)

 
-
NETSCAPE_REUSE_CIPHER_CHANGE_BUG
 
 also aliased
-as CVE-2010-4180. Postfix 2.8 disables this work-around by
-default with OpenSSL versions that may predate the fix. Fixed in
-OpenSSL 0.9.8q and OpenSSL 1.0.0c.

-
-
SSLREF2_REUSE_CERT_TYPE_BUG
 
See
-SSL_CTX_set_options(3)

-
 
MICROSOFT_BIG_SSLV3_BUFFER
 
See
 SSL_CTX_set_options(3)

 
+
MICROSOFT_SESS_ID_BUG
 
See SSL_CTX_set_options(3)

+
 
MSIE_SSLV2_RSA_PADDING
 
 also aliased as
 CVE-2005-2969. Postfix 2.8 disables this work-around by
 default with OpenSSL versions that may predate the fix. Fixed in
 OpenSSL 0.9.7h and OpenSSL 0.9.8a.

 
+
NETSCAPE_CHALLENGE_BUG
 
See SSL_CTX_set_options(3)

+
+
NETSCAPE_REUSE_CIPHER_CHANGE_BUG
 
 also aliased
+as CVE-2010-4180. Postfix 2.8 disables this work-around by
+default with OpenSSL versions that may predate the fix. Fixed in
+OpenSSL 0.9.8q and OpenSSL 1.0.0c.

+
 
SSLEAY_080_CLIENT_DH_BUG
 
See
 SSL_CTX_set_options(3)

 
-
TLS_D5_BUG
 
See SSL_CTX_set_options(3)

+
SSLREF2_REUSE_CERT_TYPE_BUG
 
See
+SSL_CTX_set_options(3)

 
 
TLS_BLOCK_PADDING_BUG
 
See SSL_CTX_set_options(3)

 
+
TLS_D5_BUG
 
See SSL_CTX_set_options(3)

+
 
TLS_ROLLBACK_BUG
 
See SSL_CTX_set_options(3).
 This is disabled in OpenSSL 0.9.7 and later. Nobody should still
 be using 0.9.6! 

 
-
DONT_INSERT_EMPTY_FRAGMENTS
 
See
-SSL_CTX_set_options(3)

-
-
CRYPTOPRO_TLSEXT_BUG
 
New with GOST support in
-OpenSSL 1.0.0.

+
TLSEXT_PADDING
Postfix ≥ 3.4. See SSL_CTX_set_options(3).

 
 

 
@@ -15919,18 +15937,39 @@ in its value are enabled (see openssl/ssl.h and SSL_CTX_set_options(3)).
 You can only enable options not already controlled by other Postfix
 settings.  For example, you cannot disable protocols or enable
 server cipher preference.  Do not attempt to turn all features by
-specifying 0xFFFFFFFF, this is unlikely to be a good idea.  

+specifying 0xFFFFFFFF, this is unlikely to be a good idea.  Some
+bug work-arounds are also valid here, allowing them to be re-enabled
+if/when they're no longer enabled by default.  The supported values
+include: 

 
 

 
+
ENABLE_MIDDLEBOX_COMPAT
 
Postfix ≥ 3.4. See
+SSL_CTX_set_options(3).

+
 
LEGACY_SERVER_CONNECT
 
See SSL_CTX_set_options(3).

 
-
NO_TICKET
 
See SSL_CTX_set_options(3).

+
NO_TICKET
 
Enabled by default when needed in
+fully-patched Postfix ≥ 2.7.  Not needed at all for Postfix ≥
+2.11, unless for some reason you do not want to support TLS session
+resumption.  Best not set explicitly.  See SSL_CTX_set_options(3).

 
 
NO_COMPRESSION
 
Disable SSL compression even if
 supported by the OpenSSL library.  Compression is CPU-intensive,
 and compression before encryption does not always improve security.  

 
+
NO_RENEGOTIATION
 
Postfix ≥ 3.4.  This can
+reduce opportunities for a potential CPU exhaustion attack.  See
+SSL_CTX_set_options(3).

+
+
NO_SESSION_RESUMPTION_ON_RENEGOTIATION
 
Postfix
+≥ 3.4. See SSL_CTX_set_options(3).

+
+
PRIORITIZE_CHACHA
 
Postfix ≥ 3.4. See SSL_CTX_set_options(3).

+
+
TLSEXT_PADDING
 
Postfix ≥ 3.4. See
+SSL_CTX_set_options(3).

+
 

 
 
 This feature is available in Postfix 2.11 and later.  

diff --git a/postfix/src/global/mail_version.h b/postfix/src/global/mail_version.h
index b84dd3978..6a191461b 100644
--- a/postfix/src/global/mail_version.h
+++ b/postfix/src/global/mail_version.h
@@ -20,8 +20,8 @@
   * Patches change both the patchlevel and the release date. Snapshots have no
   * patchlevel; they change the release date only.
   */
-#define MAIL_RELEASE_DATE	"20180519"
-#define MAIL_VERSION_NUMBER	"3.2.6"
+#define MAIL_RELEASE_DATE	"20181104"
+#define MAIL_VERSION_NUMBER	"3.2.7-RC1"
 
 #ifdef SNAPSHOT
 #define MAIL_VERSION_DATE	"-" MAIL_RELEASE_DATE
diff --git a/postfix/src/sendmail/sendmail.c b/postfix/src/sendmail/sendmail.c
index 340281bc9..5f6809c3c 100644
--- a/postfix/src/sendmail/sendmail.c
+++ b/postfix/src/sendmail/sendmail.c
@@ -388,7 +388,7 @@
 /* .IP "\fBalternate_config_directories (empty)\fR"
 /*	A list of non-default Postfix configuration directories that may
 /*	be specified with "-c config_directory" on the command line (in the
-/*	case of \fBsendmail\fR(1), with "-C config_directory"), or via the MAIL_CONFIG
+/*	case of \fBsendmail\fR(1), with the "-C" option), or via the MAIL_CONFIG
 /*	environment parameter.
 /* .IP "\fBmulti_instance_directories (empty)\fR"
 /*	An optional list of non-default Postfix configuration directories;
diff --git a/postfix/src/tls/tls.h b/postfix/src/tls/tls.h
index 79b8d73a3..a3d2cd885 100644
--- a/postfix/src/tls/tls.h
+++ b/postfix/src/tls/tls.h
@@ -107,6 +107,11 @@ extern const char *str_tls_level(int);
 #define TLS_method SSLv23_method
 #define TLS_client_method SSLv23_client_method
 #define TLS_server_method SSLv23_server_method
+#endif
+
+ /* Backwards compatibility with OpenSSL < 1.1.1 */
+#if OPENSSL_VERSION_NUMBER < 0x1010100fUL
+#define SSL_CTX_set_num_tickets(ctx, num) ((void)0)
 #endif
 
 /* SSL_CIPHER_get_name() got constified in 0.9.7g */
@@ -372,10 +377,14 @@ extern void tls_param_init(void);
 #define SSL_OP_NO_TLSv1_2	0L	/* Noop */
 #endif
 
-#ifdef SSL_TXT_TLSV1_3
+ /*
+  * OpenSSL 1.1.1 does not define a TXT macro for TLS 1.3, so we roll our own.
+  */
+#define TLS_PROTOCOL_TXT_TLSV1_3	"TLSv1.3"
+
+#if defined(TLS1_3_VERSION) && defined(SSL_OP_NO_TLSv1_3)
 #define TLS_PROTOCOL_TLSv1_3	(1<<5)	/* TLSv1_3 */
 #else
-#define SSL_TXT_TLSV1_3		"TLSv1.3"
 #define TLS_PROTOCOL_TLSv1_3	0	/* Unknown */
 #undef  SSL_OP_NO_TLSv1_3
 #define SSL_OP_NO_TLSv1_3	0L	/* Noop */
@@ -383,7 +392,7 @@ extern void tls_param_init(void);
 
 #define TLS_KNOWN_PROTOCOLS \
 	( TLS_PROTOCOL_SSLv2 | TLS_PROTOCOL_SSLv3 | TLS_PROTOCOL_TLSv1 \
-	   | TLS_PROTOCOL_TLSv1_1 | TLS_PROTOCOL_TLSv1_2 )
+	   | TLS_PROTOCOL_TLSv1_1 | TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3 )
 #define TLS_SSL_OP_PROTOMASK(m) \
 	    ((((m) & TLS_PROTOCOL_SSLv2) ? SSL_OP_NO_SSLv2 : 0L) \
 	     | (((m) & TLS_PROTOCOL_SSLv3) ? SSL_OP_NO_SSLv3 : 0L) \
diff --git a/postfix/src/tls/tls_dane.c b/postfix/src/tls/tls_dane.c
index 8ec61379b..f56d272a2 100644
--- a/postfix/src/tls/tls_dane.c
+++ b/postfix/src/tls/tls_dane.c
@@ -1341,26 +1341,20 @@ int     tls_dane_match(TLS_SESS_STATE *TLScontext, int usage,
     return (matched);
 }
 
-/* push_ext - push extension onto certificate's stack, else free it */
-
-static int push_ext(X509 *cert, X509_EXTENSION *ext)
-{
-    if (ext) {
-	if (X509_add_ext(cert, ext, -1))
-	    return 1;
-	X509_EXTENSION_free(ext);
-    }
-    return 0;
-}
-
 /* add_ext - add simple extension (no config section references) */
 
 static int add_ext(X509 *issuer, X509 *subject, int ext_nid, char *ext_val)
 {
+    int ret = 0;
     X509V3_CTX v3ctx;
+    X509_EXTENSION *ext;
 
     X509V3_set_ctx(&v3ctx, issuer, subject, 0, 0, 0);
-    return push_ext(subject, X509V3_EXT_conf_nid(0, &v3ctx, ext_nid, ext_val));
+    if ((ext = X509V3_EXT_conf_nid(0, &v3ctx, ext_nid, ext_val)) != 0) {
+	ret = X509_add_ext(subject, ext, -1);
+	X509_EXTENSION_free(ext);
+    }
+    return ret;
 }
 
 /* set_serial - set serial number to match akid or use subject's plus 1 */
diff --git a/postfix/src/tls/tls_misc.c b/postfix/src/tls/tls_misc.c
index 6db2e777b..c131a5c97 100644
--- a/postfix/src/tls/tls_misc.c
+++ b/postfix/src/tls/tls_misc.c
@@ -279,7 +279,7 @@ static const NAME_CODE protocol_table[] = {
     SSL_TXT_TLSV1, TLS_PROTOCOL_TLSv1,
     SSL_TXT_TLSV1_1, TLS_PROTOCOL_TLSv1_1,
     SSL_TXT_TLSV1_2, TLS_PROTOCOL_TLSv1_2,
-    SSL_TXT_TLSV1_3, TLS_PROTOCOL_TLSv1_3,
+    TLS_PROTOCOL_TXT_TLSV1_3, TLS_PROTOCOL_TLSv1_3,
     0, TLS_PROTOCOL_INVALID,
 };
 
@@ -355,6 +355,28 @@ static const LONG_NAME_MASK ssl_bug_tweaks[] = {
 #define SSL_OP_CRYPTOPRO_TLSEXT_BUG		0
 #endif
     NAMEBUG(CRYPTOPRO_TLSEXT_BUG),
+
+#ifndef SSL_OP_TLSEXT_PADDING
+#define SSL_OP_TLSEXT_PADDING	0
+#endif
+    NAMEBUG(TLSEXT_PADDING),
+
+#if 0
+ /*
+  * XXX: New with OpenSSL 1.1.1, this is turned on implicitly in SSL_CTX_new()
+  * and is not included in SSL_OP_ALL.  Allowing users to disable this would
+  * thus a code change that would clearing bug work-around bits in SSL_CTX,
+  * after setting SSL_OP_ALL.  Since this is presumably required for TLS 1.3 on
+  * today's Internet, the code change will be done separately later.  For now
+  * this implicit bug work-around cannot be disabled via supported Postfix
+  * mechanisms.
+  */
+#ifndef SSL_OP_ENABLE_MIDDLEBOX_COMPAT
+#define SSL_OP_ENABLE_MIDDLEBOX_COMPAT	0
+#endif
+    NAMEBUG(ENABLE_MIDDLEBOX_COMPAT),
+#endif
+
     0, 0,
 };
 
@@ -380,6 +402,27 @@ static const LONG_NAME_MASK ssl_op_tweaks[] = {
 #define SSL_OP_NO_COMPRESSION		0
 #endif
     NAME_SSL_OP(NO_COMPRESSION),
+
+#ifndef SSL_OP_NO_RENEGOTIATION
+#define SSL_OP_NO_RENEGOTIATION		0
+#endif
+    NAME_SSL_OP(NO_RENEGOTIATION),
+
+#ifndef SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
+#define SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION	0
+#endif
+    NAME_SSL_OP(NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
+
+#ifndef SSL_OP_PRIORITIZE_CHACHA
+#define SSL_OP_PRIORITIZE_CHACHA	0
+#endif
+    NAME_SSL_OP(PRIORITIZE_CHACHA),
+
+#ifndef SSL_OP_ENABLE_MIDDLEBOX_COMPAT
+#define SSL_OP_ENABLE_MIDDLEBOX_COMPAT	0
+#endif
+    NAME_SSL_OP(ENABLE_MIDDLEBOX_COMPAT),
+
     0, 0,
 };
 
@@ -976,9 +1019,16 @@ void    tls_check_version(void)
     tls_version_split(OPENSSL_VERSION_NUMBER, &hdr_info);
     tls_version_split(OpenSSL_version_num(), &lib_info);
 
+    /*
+     * Warn if run-time library is different from compile-time library,
+     * allowing later run-time "micro" versions starting with 1.1.0.
+     */
     if (lib_info.major != hdr_info.major
 	|| lib_info.minor != hdr_info.minor
-	|| lib_info.micro != hdr_info.micro)
+	|| (lib_info.micro != hdr_info.micro
+	    && (lib_info.micro < hdr_info.micro
+		|| hdr_info.major == 0
+		|| (hdr_info.major == 1 && hdr_info.minor == 0))))
 	msg_warn("run-time library vs. compile-time header version mismatch: "
 	     "OpenSSL %d.%d.%d may not be compatible with OpenSSL %d.%d.%d",
 		 lib_info.major, lib_info.minor, lib_info.micro,
diff --git a/postfix/src/tls/tls_server.c b/postfix/src/tls/tls_server.c
index 84426a639..19abedb96 100644
--- a/postfix/src/tls/tls_server.c
+++ b/postfix/src/tls/tls_server.c
@@ -502,8 +502,22 @@ TLS_APPL_STATE *tls_server_init(const TLS_SERVER_INIT_PROPS *props)
 	    ticketable = 0;
 	}
     }
-    if (ticketable)
+    if (ticketable) {
 	SSL_CTX_set_tlsext_ticket_key_cb(server_ctx, ticket_cb);
+        /*
+         * OpenSSL 1.1.1 introduces support for TLS 1.3, which can issue more
+         * than one ticket per handshake.  While this may be appropriate for
+         * communication between browsers and webservers, it is not terribly
+         * useful for MTAs, many of which other than Postfix don't do TLS
+         * session caching at all, and Postfix has no mechanism for storing
+         * multiple session tickets, if more than one sent, the second clobbers
+         * the first.  OpenSSL 1.1.1 servers default to issuing two tickets for
+         * non-resumption handshakes, we reduce this to one.  Our ticket
+         * decryption callback already (since 2.11) asks OpenSSL to avoid
+         * issuing new tickets when the presented ticket is re-usable.
+         */
+	SSL_CTX_set_num_tickets(server_ctx, 1);
+    }
 #endif
     if (!ticketable)
 	off |= SSL_OP_NO_TICKET;