Enable sd_listen_fds(3)-style socket-activation support

I've added straightforward systemd unit files in system/socket-activation/ that make use of this approach, and a README.md in the same location that describes the tradeoffs.
Do not create PidFile by default
2019-02-21 19:22:11 -05:00 · 2019-02-21 19:22:11 -05:00 · 2019-02-21 19:22:11 -05:00 · 2019-02-21 19:22:11 -05:00 · 2019-02-21 19:22:09 -05:00 · 2019-02-21 19:21:38 -05:00
23 changed files with 1573 additions and 386 deletions
@@ -1,3 +1,4 @@
 dist
 dkimpy_milter.egg-info
 *.pyc
+*~
@@ -1,11 +1,77 @@
+1.0.1 2019-02-11
+ * Reorder milter start and dropping privileges so permissions on Unix socket
+   are correct (LP: 1797720)
+ - Make domain checks case insensitive for determining if signing should be
+   done (LP: #1815311)
+ - Add additional Sendmail configuration information to README from OpenDKIM
+   update based on input from Дилян Палаузов (LP: #1801619)
+ - Add information on Ed25519 key creation to README (LP: #1815313)

-0.9.1 2018-02-17
- - DKIM signing and verification using both RSA and Ed25519
- - The following configuration options are supported (same definition as
-   OpenDKIM): Domain, KeyFile, KeyFileEd25519, Mode, PidFile, Selector,
-   Socket, Syslog, UMask, and UserID (see dkimpy-milter.conf.5)
- - This is an Alpha grade release and while the implemented features work, it
-   is nowhere near being a complete package
+1.0.0 2018-05-11
+ - Minor documentation updates
+ - Deleted reference to obsolete syslog target in unit file
+
+0.9.7 2018-03-19
+ - Made sysv init executable
+ - Add missing documentation key to system/dkimpy-milter.service
+ - Put version directly in setup.py and do not import dkimpy_milter to ease
+   install via pip
+ - Minor sysv init improvments
+
+0.9.6 2018-03-13
+ - Fixed typo in package installation section of README
+ - Added more to README about first run with systemd
+ - Fixed typo in path for fallback location of the config file if one is not
+   provided
+ - Added protection for malformed From addresses.  If the From does not at
+   least have an '@' in the address, then the signing domain is not extracted
+   and the message will not be signed
+
+0.9.5.1 2018-03-10
+ - Add conf file location to systemd unit file
+ - Fix setup.py install locations so they are installed correctly
+
+0.9.5 2018-03-10
+ - Beta 1 (updated Alpha -> Beta warning in README and trove classifiers)
+ - Added support for MacroList option
+ - Added support for MacroListVerify option
+ - Added example in README to show use of MacroList* to separate inbound and
+   outbound mail streams
+ - Added support for SyslogSuccess option (both signing and verifying)
+ - Rationalized logging to be much less verbose unless SyslogSuccess or
+   debugLevel are set - default is generally start/stop/errors only
+ - Fixed install_requires so either dnspython (preferred if neither is
+   installed) or PyDNS satisfies the install requirements
+ - Updated Authentication Results result comment not to mention key size for
+   ed25519 signatures, since it's irrelevant
+ - Enhanced signature verification logging to provide more useful information
+
+0.9.4 2018-03-09
+ - Create PID directory if it is missing
+ - Fix crash when verifying if domain for signing was not set
+ - Fix header folding to use \n only to align with milter protocol
+   requirements
+ - Added information about creating a dedicated user and PID file directory
+   creation to README
+ - Fixed a bug where dkim fail might be reported as pass when verifying
+   multiple signatures and a previous signature had passed
+ - Make RSA signatures in dkimpy-milter optional, so dkimpy-milter can be
+   added after an existing DKIM signing application to add an Ed25519
+   signature (Thanks to A. Schulze for the patch)
+ - Added support for AuthservID option
+ - Added support for InternalHosts option (ipaddress and either dns (dnspython)
+   or pydns (DNS) modules are now required)
+ - Added support for DiagnosticDirectory and updated dkimpy-milter specifics in
+   dkimpy-milter.conf.5
+
+0.9.3 2018-03-02
+ - Fixup csl dataset processing for single item lists
+ - file: dataset support
+ - Bump minimum authres version to 1.1.0 due to known issues with 1.0.2
+ - Ignore errors parsing broken authres header fields
+ - Fold added authres header fields
+ - Fix pidfile permissions
+ - Fix socket setup sequence so Unix sockets work

 0.9.2 2018-02-19
 - Improved package requirements definition
@@ -16,3 +82,12 @@
 - Initial dataset support: csl
 - Only sign if mail from from a domain in Domain and only if Mode is not
   verfication only
+   
+0.9.1 2018-02-17
+ - DKIM signing and verification using both RSA and Ed25519
+ - The following configuration options are supported (same definition as
+   OpenDKIM): Domain, KeyFile, KeyFileEd25519, Mode, PidFile, Selector,
+   Socket, Syslog, UMask, and UserID (see dkimpy-milter.conf.5)
+ - This is an Alpha grade release and while the implemented features work, it
+   is nowhere near being a complete package
+
@@ -1,11 +1,17 @@
-This is a DKIM signing and verification milter.  In theory it works with both
-Postfix and Sendmail, but the author has zero experience with Sendmail, so
-reports of success/failure with Sendmail and patches are welcom.
+OVERVIEW
+========
+
+This is a DKIM signing and verification milter.  It has been tested with both
+Postfix and Sendmail.

 The configuration file is designed to be compatible with OpenDKIM, but only
 a subset of OpenDKIM options are supported.  If an unsupported option is
 specified, an error will be raised.

+
+INSTALLATION
+===========
+
 This package includes a default configuration file and man pages.  For those
 to be installed when installing using setup.py, the following incantation is
 required because setuptools developers decided not being able to do this by
@@ -13,16 +19,225 @@ default is a feature:

 python setup.py install --single-version-externally-managed --record=/dev/null

+For users of Debian Stable (Debian 9, Codename Squeeze), all dependencies are
+available in either the main or backports repositories:
+
+[sudo] apt install python-milter python-nacl python-ipaddress python-dnspython
+[sudo] apt install -t stretch-backports python-authres python-dkim
+
+The preferred method of installation is from PyPi using pip (if distribution
+packages are not available):
+
+[sudo] pip install dkimpy_milter
+
+Using pip will cause required packages to be installed via easy_install if they
+have not been previously installed.  Because pymilter and PyNaCl are compiled
+Python extensions, the system will need appropriate development packages and
+an C compiler.  Alternately, install these dependencies from dsitribution/OS
+packages and then pip install dkimpy_milter.
+
+The milter will work with either pydns (DNS) or dnspython (dns), preferring
+dnspython is both are available.  The dkimpy DKIM module also works with
+either.
+
+
+SETUP
+====
+
+SIGNING KEYS
+============
+
+In order to create DKIM signatures, a private key must be available.  Signing
+keys should be protected (owned by root:root with permissions 600 in a
+directory that is not world readable).  Different keys are required for RSA
+and (if used) Ed25519.
+
+RSA
+===
+
+Both public and private keys for RSA have standard formats and there are many
+tools available to create them.  Keys must (RFC 8302) have a minimum size of
+1024 bits and should have a size of at least 2048 bits.  The dknewkey script
+that is provided with dkimpy is one such tool:
+
+dknewkey exampleprivkey
+
+will produce both the private key file (.key suffix) and a file with the DKIM
+public key record to be published DNS (.dns suffix).  RSA is the default key
+type.  2048 bits is the default key size.
+
+ED25519
+=======
+
+There is no standardized non-binary representation for Ed25519 private keys,
+so in order to generate Ed25519 keys for dkimpy-milter, dkimpy specific tools
+must be used to be compatible.  The same dknewkey script support Ed25519:
+
+dknewkey --ktype ed25519 anothernewkey
+
+will provide both the private key file (.key suffix) and a file with the DKIM
+public key record to be published DNS (.dns suffix).  Ed25519 keys do not have
+variable bit lengths.
+
+MTA INTEGRATION
+==============
+
 Both a systemd unit file and a sysv init file are provided.  Both make
 assumptions about defaults being used, e.g. if a non-standard pidfile name is
 used, they will need to be updated.  The sysv init file is Debian specific and
 untested, since the developers are not using sysv init.  Feedback/patches
 welcome.

-The python DKIM library, dkimpy, requires the entire message being signed or
-verified to be in memory, so dkimpy-milter does not write messages out to a temp
-file.  This may impact performance on low-memory systems.
+The dkimpy-milter drops priviledges after setup to the user/group specified in
+UserID.  During initial setup, this system user needs to be manually created.
+As an example, using the default dkimpy-user on Debian, the command would be:

-WARNING: This is an alpha grade release to support interoperability testing with
-Ed25519 signatures and basic functionality.  It is known to be incomplete and
-not suitable for general use.
+[sudo] adduser --system --no-create-home --quiet --disabled-password \
+               --disabled-login --shell /bin/false --group \
+               --home /var/run/dkimpy-milter dkimpy-milter
+
+Since /var/run or /run is sometimes on a tempfs, if the PID file directory is
+missing, the milter will create it on startup.
+
+To start dkimpy-milter with systemd for the first time, you will need to take
+the following steps:
+
+[sudo] systemctl daemon-reload
+[sudo] systemctl enable dkimpy-milter
+[sudo] systemctl start dkimpy-milter
+[sudo] systemctl status dkimpy-milter (to verify it started correctly)
+
+As with all milters, dkimpy-milter needs to be integrated with your MTA of
+choice (Sendmail or Postfix).
+
+SENDMAIL
+========
+
+Configuration is very similar to opendkim, but needs some adjustment for
+dkimpy-milter. Here's an example configuration line to include in your
+sendmail.mc:
+
+INPUT_MAIL_FILTER(`dkimpy-milter', `S=local:/var/run/dkimpy-milter/dkimpy-milter.sock')dnl
+
+Changing the sendmail.mc file requires a Make (to compile it into sendmail.cf)
+and a restart of sendmail.  Note that S= needs to match the value of Socket in
+the dkimpy-milter configuration file.
+
+Milter support should be present by default in most versions of sendmail
+these days, but if not included in your Sendmail build, see:
+http://www.elandsys.com/resources/sendmail/milter.html
+
+ISSUES USING SENDMAIL TO SIGN AND VERIFY
+========================================
+
+When using the sendmail MTA in both signing and verifying mode, there are
+a few issues of which to be aware that might cause operational problems
+and deserve consideration.
+
+(a) When the MTA will be used for relaying emails, e.g. delivering to other
+    hosts using the aliases mechanism, it is important not to break
+    signatures inserted by the original sender.  This is particularly sensitive
+    particular when the sending domain has published a "reject" DMARC policy.
+
+    By default, sendmail quotes to address header fields when there are no
+    quotes and the display part of the address contains a period or an
+    apostrophe.  However, opendkim only sees the raw, unmodified form of
+    the header field, and so the content that gets verified and what gets
+    signed will not be the same, guaranteeing the attached signature is not
+    valid.
+
+    To direct sendmail not to modify the headers, add this to your sendmail.mc:
+
+    	conf(`confMUST_QUOTE_CHARS', `')
+
+(b) As stated in sendmail's KNOWNBUGS file, sendmail truncates header field
+    values longer than 256 characters, which could mean truncating the domain
+    of a long From: header field value and invalidating the signature.
+    You may wish to consider increasing MAXNAME in sendmail/conf.h to mitigate
+    changing the messages and invalidating their signatures.  This change
+    requires recompiling sendmail.
+
+(c) Similar to (a) above, sendmail may wrap very long single-line recipient
+    fields for presentation purposes; for example:
+
+    To: very long name <a@example.org>,anotherloo...ong name b <b@example.org>
+
+    ...might be rewritten as:
+
+    To: very long name <a@example.org>,
+    	anotherloo...ong name b <b@example.org>
+
+    This rewrite is also done after opendkim has seen the message, meaning
+    the signature opendkim attaches to the message does not match the
+    content it signed.  There is not a known configuration change to
+    mitigate this mutation.
+
+    The only known mechanism for dealing with this is to have distinct
+    instances of opendkim do the verifying (inbound) and signing (outbound)
+    so that the version that arrives at the signing instance is already
+    in the rewritten form, guaranteeing the input and output are the same
+    and thus the signature matches the payload.
+
+POSTFIX
+=======
+
+Integration of dkimpy-milter into Postfix is like any milter (See Postfix's
+README_FILES/MILTER_README).  Here's an example master.cf excerpt that talks
+to two dkimpy-milter instances, one configured for signing and one configured
+for verification:
+
+smtp       inet  n       -       -       -      -       smtpd
+    ...
+    -o smtpd_milters=inet:localhost:8892
+    ...
+
+submission inet  n       -       -       -      -       smtpd
+    ...
+    -o smtpd_milters=inet:localhost:8891
+    ...
+
+These need to match the Socket value for each dkimpy-milter instance.
+
+Care is required to segregate outbound mail to be signed and inbound mail to
+be verified.  The above example uses two instances of dkimpy-milter to do
+this.  There are many possible ways.  Here is another example using milter
+macros to keep the mail streams segregated:
+
+Postfix master.cf:
+
+smtp       inet  n       -       -       -       -       smtpd
+    ...
+    -o smtpd_milters=inet:localhost:8891
+    -o milter_macro_daemon_name=VERIFYING
+    ...
+
+submission inet n       -       -       -       -       smtpd
+    -o syslog_name=postfix/submission
+    -o smtpd_tls_security_level=encrypt
+    -o smtpd_sasl_auth_enable=yes
+    ...
+    -o milter_macro_daemon_name=ORIGINATING
+    -o smtpd_milters=inet:localhost:8891
+    ...
+
+Dkimpy-milter.conf:
+
+...
+Mode			sv
+MacroList		dameon_name|ORIGINATING
+MacroListVerify		daemon_name|VERIFYING
+...
+
+
+NOTES
+=====
+
+The python DKIM library, dkimpy, requires the entire message being signed or
+verified to be in memory, so dkimpy-milter does not write messages out to a
+temp file.  This may impact performance on low-memory systems.
+
+DKIM with Ed25519 signatures are described in RFC 8463.  Version 1.0.0 and
+later support Ed25519 signing and verification.  RFC 8301 removed rsa-sha1
+from DKIM.  dkimpy-milter does not sign with rsa-sha1, but still considers
+rsa-sha1 signatures as valid for verification because they are still in
+common use and are not known to be cryptographically broken.
@@ -25,23 +25,30 @@ Sign based on Domain   implemented      verified
 Canonicalization       implemented      verified
 SyslogFacility         implemented      verified

-0.9.5 (Beta)
-AuthservID
-Diagnostics
-DiagnosticDirectory
-InternalHosts
+0.9.3 (Alpha)
+File dataset           implemented      verified

-SyslogSuccess
+0.9.4 (Alpha)
+AuthservID      implemented     verified
+DiagnosticDirectory     implemented     verified
+InternalHosts   implemented     verified
+
+0.9.5 (Beta)
+MacroList	implemented	verified
+MacroListVerify	implemented	verified
+SyslogSuccess   implemented     verified

 1.0.0
-Convert dkim-milter-python config
-No additional features planned
+No additional features

-Plannedataset type support:
-file://
-refile:
-db:/.db
-csl:
+1.0.1
+Bug fix only, improved documentation
+
+1.1.0 (planned)
+Port to Python 3
+Subdomain support
+
+Planned dataset type support (if needed):
 mdb:

 Considered for near-term feature release
@@ -49,16 +56,17 @@ Considered for near-term feature release
 AlwaysAddARHeader
 ChangeRootDirectory
 ClockDrift (requires dkimpy change)
-DNSTimeout (requires dkmpy change)
-MacroList
+DNSTimeout (requires dkimpy change)
 MilterDebug
 MinimumKeyBits
+OversignHeaders (may require dkimpy changes)
 PeerList
 SignatureAlgorithm

 Later

 BaseDirectory
+Diagnostics (requires dkimpy changes)
 DontSignMailTo
 ExemptDomains
 ExternalIgnoreList
@@ -82,7 +90,6 @@ On-InternalError
 On-KeyNotFound
 On-NoSignature
 On-SignatureError
-OversignHeaders
 RemoveARAll
 RemoveARFrom
 RemoveOldSignatures 
@@ -1,4 +1,4 @@
-#! /usr/bin/python2
+#! /usr/bin/python3
 # Original dkim-milter.py code:
 # Author: Stuart D. Gathman <stuart@bmsi.com>
 # Copyright 2007 Business Management Systems, Inc.
@@ -25,24 +25,25 @@ import sys
 import syslog
 import Milter
 import dkim
-from dkim.dnsplug import get_txt
-from dkim.util import parse_tag_value
 import authres
 import os
 import tempfile
-import StringIO
+import io
 import re
-from Milter.config import MilterConfigParser
-from Milter.utils import iniplist,parse_addr,parseaddr
+import codecs
+from Milter.utils import parse_addr, parseaddr
 import dkimpy_milter.config as config
 from dkimpy_milter.util import drop_privileges
 from dkimpy_milter.util import setExceptHook
 from dkimpy_milter.util import write_pid
 from dkimpy_milter.util import read_keyfile
+from dkimpy_milter.util import own_socketfile
+from dkimpy_milter.util import fold

-__version__ = "0.9.2"
+__version__ = "1.0.1"
 FWS = re.compile(r'\r?\n[ \t]+')

+
 class dkimMilter(Milter.Base):
    "Milter to check and sign DKIM.  Each connection gets its own instance."

@@ -58,21 +59,49 @@ class dkimMilter(Milter.Base):
    @Milter.noreply
    def connect(self, hostname, unused, hostaddr):
        self.internal_connection = False
+        self.external_connection = False
        self.hello_name = None
        # sometimes people put extra space in sendmail config, so we strip
-    self.receiver = self.getsymval('j').strip()
+        self.receiver = self.getsymval('j')
+        if self.receiver is not None:
+            self.receiver = self.receiver.strip()
+        try:
+            self.AuthservID = milterconfig['AuthservID']
+        except:
+            self.AuthservID = self.receiver
        if hostaddr and len(hostaddr) > 0:
            ipaddr = hostaddr[0]
-        """if iniplist(ipaddr,self.conf.internal_connect): FIXME
-            self.internal_connection = True"""
-    else: ipaddr = ''
+            if milterconfig['IntHosts']:
+                if milterconfig['IntHosts'].match(ipaddr):
+                    self.internal_connection = True
+        else:
+            ipaddr = ''
        self.connectip = ipaddr
+        if milterconfig.get('MacroList') and not self.internal_connection:
+            macrolist = milterconfig.get('MacroList')
+            for macro in macrolist:
+                macroname = macro.split('|')[0]
+                macroname = '{' + macroname + '}'
+                macroresult = self.getsymval(macroname)
+                if ((len(macro.split('|')) == 1 and macroresult) or macroresult
+                        in macro.split('|')[1:]):
+                    self.internal_connection = True
+        if milterconfig.get('MacroListVerify'):
+            macrolist = milterconfig.get('MacroListVerify')
+            for macro in macrolist:
+                macroname = macro.split('|')[0]
+                macroname = '{' + macroname + '}'
+                macroresult = self.getsymval(macroname)
+                if ((len(macro.split('|')) == 1 and macroresult) or macroresult
+                        in macro.split('|')[1:]):
+                    self.external_connection = True
        if self.internal_connection:
            connecttype = 'INTERNAL'
        else:
            connecttype = 'EXTERNAL'
-    if milterconfig.get('Syslog'):
-        syslog.syslog("connect from {0} at {1} {2}".format(hostname,hostaddr,connecttype))
+        if milterconfig.get('Syslog') and milterconfig.get('debugLevel') >= 1:
+            syslog.syslog("connect from {0} at {1} {2}"
+                          .format(hostname, hostaddr, connecttype))
        return Milter.CONTINUE

    # multiple messages can be received on a single connection
@@ -80,58 +109,47 @@ class dkimMilter(Milter.Base):
    # of each message.
    @Milter.noreply
    def envfrom(self, f, *str):
-    if milterconfig.get('Syslog'):  
+        if milterconfig.get('Syslog') and milterconfig.get('debugLevel') >= 2:
            syslog.syslog("mail from: {0} {1}".format(f, str))
-    self.fp = StringIO.StringIO()
+        self.fp = io.BytesIO()
        self.mailfrom = f
        t = parse_addr(f)
-    if len(t) == 2: t[1] = t[1].lower()
+        if len(t) == 2:
+            t[1] = t[1].lower()
        self.canon_from = '@'.join(t)
-    self.user = self.getsymval('{auth_authen}')
        self.has_dkim = 0
        self.author = None
        self.arheaders = []
        self.arresults = []
-    '''if self.user:
-      # Very simple SMTP AUTH policy by default:
-      #   any successful authentication is considered INTERNAL
-      self.internal_connection = True
-      auth_type = self.getsymval('{auth_type}')
-      ssl_bits =  self.getsymval('{cipher_bits}')
-      if milterconfig.get('Syslog'):
-          syslog.syslog(
-              "SMTP AUTH:",self.user,"sslbits =",ssl_bits, auth_type,
-              "ssf =",self.getsymval('{auth_ssf}'), "INTERNAL"
-      )
-      # Detailed authorization policy is configured in the access file below.
-      self.arresults.append(
-        authres.SMTPAUTHAuthenticationResult(result = 'pass',
-      	result_comment = auth_type+' sslbits='+ssl_bits, smtp_auth = self.user)
-      )'''
        return Milter.CONTINUE

    @Milter.noreply
    def header(self, name, val):
        lname = name.lower()
        if lname == 'dkim-signature':
-        if milterconfig.get('Syslog'):
+            if (milterconfig.get('Syslog') and
+                    milterconfig.get('debugLevel') >= 1):
                syslog.syslog("{0}: {1}".format(name, val))
            self.has_dkim += 1
        if lname == 'from':
            fname, self.author = parseaddr(val)
-        self.fdomain = self.author.split('@')[1]
-        if milterconfig.get('Syslog'):
+            try:
+                self.fdomain = self.author.split('@')[1].lower()
+            except IndexError as er:
+                self.fdomain = ''  # self.author was not a proper email address
+            if (milterconfig.get('Syslog') and
+                    milterconfig.get('debugLevel') >= 1):
                syslog.syslog("{0}: {1}".format(name, val))
        elif lname == 'authentication-results':
            self.arheaders.append(val)
        if self.fp:
-        self.fp.write("%s: %s\n" % (name,val))
+            self.fp.write(b"%s: %s\n" % (codecs.encode(name, 'ascii'), codecs.encode(val, 'ascii')))
        return Milter.CONTINUE

    @Milter.noreply
    def eoh(self):
        if self.fp:
-      self.fp.write("\n")                         # terminate headers
+            self.fp.write(b"\n")   # terminate headers
        self.bodysize = 0
        return Milter.CONTINUE

@@ -148,53 +166,89 @@ class dkimMilter(Milter.Base):
        # Remove existing Authentication-Results headers for our authserv_id
        for i, val in enumerate(self.arheaders, 1):
            # FIXME: don't delete A-R headers from trusted MTAs
-      ar = authres.AuthenticationResultsHeader.parse_value(FWS.sub('',val))
-      if ar.authserv_id == self.receiver:
+            try:
+                ar = (authres.AuthenticationResultsHeader
+                      .parse_value(FWS.sub('', val)))
+                if ar.authserv_id == self.AuthservID:
                    self.chgheader('authentication-results', i, '')
-        if milterconfig.get('Syslog'):
+                    if (milterconfig.get('Syslog') and
+                            milterconfig.get('debugLevel') >= 1):
                        syslog.syslog('REMOVE: {0}'.format(val))
+            except:
+                # Don't error out on unparseable AR header fiels
+                pass
        # Check or sign DKIM
        self.fp.seek(0)
-    if (self.fdomain in milterconfig.get('Domain')) and (not milterconfig.get('Mode') == 'v'):
+        if milterconfig.get('Domain'):
+            domain = milterconfig.get('Domain')
+        else:
+            domain = ''
+        if ((self.fdomain in domain) and not milterconfig.get('Mode') == 'v'
+                and not self.external_connection):
            txt = self.fp.read()
            self.sign_dkim(txt)
-      result = None
-    if (self.has_dkim) and (not self.internal_connection) and (milterconfig.get('Mode') == 'v' or milterconfig.get('Mode') == 'sv'):
+        if ((self.has_dkim) and (not self.internal_connection) and
+            (milterconfig.get('Mode') == 'v' or
+             milterconfig.get('Mode') == 'sv')):
            txt = self.fp.read()
            self.check_dkim(txt)
-    else:
-      result = 'none'
        if self.arresults:
-        h = authres.AuthenticationResultsHeader(authserv_id = self.receiver, 
+            h = authres.AuthenticationResultsHeader(authserv_id=
+                                                    self.AuthservID,
                                                    results=self.arresults)
-        if milterconfig.get('Syslog'):
-            syslog.syslog(str(h))
-        name,val = str(h).split(': ',1)
+            h = fold(codecs.encode(str(h), 'ascii'))
+            if (milterconfig.get('Syslog') and
+                    milterconfig.get('debugLevel') >= 2):
+                syslog.syslog(codecs.decode(h, 'ascii'))
+            name, val = codecs.decode(h, 'ascii').split(': ', 1)
            self.addheader(name, val, 0)
        return Milter.CONTINUE

    def sign_dkim(self, txt):
-      canon = milterconfig.get('Canonicalization')
+        canon = codecs.encode(milterconfig.get('Canonicalization'), 'ascii')
        canonicalize = []
-      if len(canon.split('/')) == 2:
-          canonicalize.append(canon.split('/')[0])
-          canonicalize.append(canon.split('/')[1])
+        if len(canon.split(b'/')) == 2:
+            canonicalize.append(canon.split(b'/')[0])
+            canonicalize.append(canon.split(b'/')[1])
        else:
            canonicalize.append(canon)
            canonicalize.append(canon)
+            if (milterconfig.get('Syslog') and
+                    milterconfig.get('debugLevel') >= 1):
                syslog.syslog('canonicalize: {0}'.format(canonicalize))
        try:
+            if privateRSA:
                d = dkim.DKIM(txt)
-        h = d.sign(milterconfig.get('Selector'), self.fdomain, privateRSA,
-                canonicalize=(canonicalize[0], canonicalize[1]))
-        name,val = h.split(': ',1)
-        self.addheader(name,val.strip().replace('\r\n','\n'),0)
+                h = d.sign(codecs.encode(milterconfig.get('Selector'), 'ascii'), codecs.encode(self.fdomain, 'ascii'),
+                           codecs.encode(privateRSA, 'ascii'),
+                           canonicalize=(canonicalize[0],
+                                         canonicalize[1]))
+                name, val = h.split(b': ', 1)
+                self.addheader(codecs.decode(name, 'ascii'), codecs.decode(val, 'ascii').strip().replace('\r\n', '\n'), 0)
+                if (milterconfig.get('Syslog') and
+                    (milterconfig.get('SyslogSuccess')
+                     or milterconfig.get('debugLevel') >= 1)):
+                    syslog.syslog('{0}: {1} DKIM-Signature field added (s={2} '
+                                  'd={3})'.format(self.getsymval('i'),
+                                                  d.signature_fields.get(b'a'),
+                                                  d.signature_fields.get(b's'),
+                                                  d.domain.lower()))
            if privateEd25519:
                d = dkim.DKIM(txt)
-            h = d.sign(milterconfig.get('SelectorEd25519'), self.fdomain, privateEd25519,
-                    canonicalize=(canonicalize[0], canonicalize[1]), signature_algorithm='ed25519-sha256')
-            name,val = h.split(': ',1)
-            self.addheader(name,val.strip().replace('\r\n','\n'),0)
+                h = d.sign(codecs.encode(milterconfig.get('SelectorEd25519'), 'ascii'), codecs.encode(self.fdomain, 'ascii'),
+                           privateEd25519, canonicalize=(canonicalize[0],
+                                                         canonicalize[1]),
+                           signature_algorithm=b'ed25519-sha256')
+                name, val = h.split(b': ', 1)
+                self.addheader(codecs.decode(name, 'ascii'), codecs.decode(val, 'ascii').strip().replace('\r\n', '\n'), 0)
+                if (milterconfig.get('Syslog') and
+                    (milterconfig.get('SyslogSuccess')
+                     or milterconfig.get('debugLevel') >= 1)):
+                    syslog.syslog('{0}: {1} DKIM-Signature field added (s={2} '
+                                  'd={3})'.format(self.getsymval('i'),
+                                                  d.signature_fields.get(b'a'),
+                                                  d.signature_fields.get(b's'),
+                                                  d.domain.lower()))
        except dkim.DKIMException as x:
            if milterconfig.get('Syslog'):
                syslog.syslog('DKIM: {0}'.format(x))
@@ -205,15 +259,26 @@ class dkimMilter(Milter.Base):

    def check_dkim(self, txt):
        res = False
-      conf = self.conf
        for y in range(self.has_dkim):  # Verify _ALL_ the signatures
            d = dkim.DKIM(txt)
            try:
-            res = d.verify(idx=y)
-            if res:
-              self.dkim_comment = 'Good {0} bit {1} signature.'.format(d.keysize, d.signature_fields.get(b'a'))
+                dnsoverride = milterconfig.get('DNSOverride')
+                if isinstance(dnsoverride, str):
+                    syslog.syslog("DNSOverride: {0}".format(dnsoverride))
+                    res = d.verify(idx=y, dnsfunc=lambda _x: dnsoverride)
                else:
-              self.dkim_comment = 'Bad {0} bit {1} signature.'.format(d.keysize, d.signature_fields.get(b'a'))
+                    res = d.verify(idx=y)
+                algo = codecs.decode(d.signature_fields.get(b'a'), 'ascii')
+                if res:
+                    if algo == 'ed25519-sha256':
+                        self.dkim_comment = ('Good {0} signature'
+                                             .format(algo))
+                    else:
+                        self.dkim_comment = ('Good {0} bit {1} signature'
+                                             .format(d.keysize, algo))
+                else:
+                    self.dkim_comment = ('Bad {0} bit {1} signature.'
+                                         .format(d.keysize, algo))
            except dkim.DKIMException as x:
                self.dkim_comment = str(x)
                if milterconfig.get('Syslog'):
@@ -222,30 +287,45 @@ class dkimMilter(Milter.Base):
                self.dkim_comment = str(x)
                if milterconfig.get('Syslog'):
                    syslog.syslog("check_dkim: {0}".format(x))
-          self.header_i = d.signature_fields.get(b'i')
-          self.header_d = d.signature_fields.get(b'd')
-          self.header_a = d.signature_fields.get(b'a')
+            self.header_i = codecs.decode(d.signature_fields.get(b'i'), 'ascii')
+            self.header_d = codecs.decode(d.signature_fields.get(b'd'), 'ascii')
+            self.header_a = codecs.decode(d.signature_fields.get(b'a'), 'ascii')
            if res:
-              if milterconfig.get('Syslog'):
-                  syslog.syslog('DKIM: Pass ({0})'.format(d.domain))
-              self.dkim_domain = d.domain
+                if (milterconfig.get('Syslog') and
+                        (milterconfig.get('SyslogSuccess') or
+                         milterconfig.get('debugLevel') >= 1)):
+                    syslog.syslog('{0}: {1} DKIM signature verified (s={2} '
+                                  'd={3})'.format(self.getsymval('i'),
+                                                  d.signature_fields.get(b'a'),
+                                                  d.signature_fields.get(b's'),
+                                                  d.domain.lower()))
+                self.dkim_domain = d.domain.lower()
            else:
+                if milterconfig.get('DiagnosticDirectory'):
                    fd, fname = tempfile.mkstemp(".dkim")
                    with os.fdopen(fd, "w+b") as fp:
                        fp.write(txt)
                    if milterconfig.get('Syslog'):
-                syslog.syslog('DKIM: Fail (saved as {0})'.format(fname))
+                        syslog.syslog('DKIM: Fail (saved as {0})'
+                                      .format(fname))
+                else:
+                    syslog.syslog('DKIM: Fail ({0})'.format(d.domain.lower()))
            if res:
                result = 'pass'
            else:
                result = 'fail'
+            res = False
            self.arresults.append(
                authres.DKIMAuthenticationResult(result=result,
-              header_i = self.header_i, header_d = self.header_d, header_a = self.header_a,
-              result_comment = self.dkim_comment)
+                                                 header_i=self.header_i,
+                                                 header_d=self.header_d,
+                                                 header_a=self.header_a,
+                                                 result_comment=
+                                                 self.dkim_comment)
            )
        return

+
 def main():
    # Ugh, but there's no easy way around this.
    global milterconfig
@@ -253,7 +333,7 @@ def main():
    global privateEd25519
    privateRSA = False
    privateEd25519 = False
-    configFile = '/etc/dkimpy-milter.conf'
+    configFile = '/usr/local/etc/dkimpy-milter.conf'
    if len(sys.argv) > 1:
        if sys.argv[1] in ('-?', '--help', '-h'):
            print('usage: dkimpy-milter [<configfilename>]')
@@ -261,7 +341,8 @@ def main():
        configFile = sys.argv[1]
    milterconfig = config._processConfigFile(filename=configFile)
    if milterconfig.get('Syslog'):
-        facility = eval("syslog.LOG_{0}".format(milterconfig.get('SyslogFacility').upper()))
+        facility = eval("syslog.LOG_{0}"
+                        .format(milterconfig.get('SyslogFacility').upper()))
        syslog.openlog(os.path.basename(sys.argv[0]), syslog.LOG_PID, facility)
        setExceptHook()
    pid = write_pid(milterconfig)
@@ -269,15 +350,28 @@ def main():
        privateRSA = read_keyfile(milterconfig, 'RSA')
    if milterconfig.get('KeyFileEd25519'):
        privateEd25519 = read_keyfile(milterconfig, 'Ed25519')
-    drop_privileges(milterconfig)
-    if milterconfig.get('Syslog'):
-        syslog.syslog('dkimpy-milter started:{0} user:{1}'.format(pid,milterconfig.get('UserID')))
    Milter.factory = dkimMilter
    Milter.set_flags(Milter.CHGHDRS + Milter.ADDHDRS)
    miltername = 'dkimpy-filter'
    socketname = milterconfig.get('Socket')
+    if socketname is None:
+        if int(os.environ.get('LISTEN_PID', '0')) == os.getpid():
+            lfds = os.environ.get('LISTEN_FDS')
+            if lfds is not None:
+                if lfds != '1':
+                    syslog.syslog('LISTEN_FDS is set to "{0}", but we only know how to deal with "1", ignoring it'.
+                                  format(lfds))
+                else:
+                    socketname = 'fd:3'
+        if socketname is None:
+            socketname = 'local:/var/run/dkimpy-milter/dkimpy-milter.sock'
+    own_socketfile(milterconfig, socketname)
+    drop_privileges(milterconfig)
    sys.stdout.flush()
    Milter.runmilter(miltername, socketname, 240)
+    if milterconfig.get('Syslog'):
+        syslog.syslog('dkimpy-milter started:{0} user:{1}'
+                      .format(pid, milterconfig.get('UserID')))

 if __name__ == "__main__":
    main()
@@ -0,0 +1,6 @@
+#!/usr/bin/python3
+
+from dkimpy_milter import main
+
+if __name__ == "__main__":
+    main()
@@ -27,42 +27,211 @@
 import syslog
 import os
 import sys
-import re
-import urllib
 import stat
 import dkim
-
+import socket
+import ipaddress
+from .dnsplug import Session

 #  default values
 defaultConfigData = {
    'Syslog': 'yes',
    'SyslogFacility': 'mail',
-        'UMask' : 007,
+    'UMask': 0o07,
    'Mode': 'sv',
-        'Socket' : 'local:/var/run/dkimpy-milter/dkimpy-milter.sock',
-        'PidFile'  : '/var/run/dkimpy-milter/dkimpy-milter.pid',
+    'Socket': None,
+    'PidFile': None,
    'UserID': 'dkimpy-milter',
-        'Canonicalization' : 'relaxed/simple'
+    'Canonicalization': 'relaxed/simple',
+    'InternalHosts': '127.0.0.1',
+    'IntHosts': False,
+    'DiagnosticDirectory': '',
+    'MacroList': '',
+    'MacroListVerify': '',
+    'DNSOverride': None,
+    'debugLevel': 0  # Undocumented config item for developer use
    }


-#################################
 class ConfigException(Exception):
    '''Exception raised when there's a configuration file error.'''
    pass

-####################################################################
+
+class HostsDataset(object):
+    '''Hold a group of host related dataset objects'''
+
+    def __init__(self, dataset):
+        self.dataset = []
+        # Self.dataset will end up being a list of DataSetItem(s).
+        for item in dataset:
+            item = item.rstrip(']')
+            item = item.lstrip('[')
+            self.dataset.append(self.DatasetItem(item))
+
+    class DatasetItem(object):
+        '''Individual dataset item'''
+
+        def __init__(self, item):
+            self.item = item
+            self.isipv4 = False
+            self.isipv4cidr = False
+            self.isipv6 = False
+            self.isipv6cidr = False
+            self.ishostname = False
+            self.isdomain = False
+            self.negative = False
+            if self.item[0] == '!':
+                self.item = item[1:]
+                self.negative = True
+            try:
+                self.item = ipaddress.ip_address(str(self.item, "utf-8"))
+                if isinstance(self.item, ipaddress.IPv4Address):
+                    self.isipv4 = True
+                elif isinstance(self.item, ipaddress.IPv6Address):
+                    self.isipv6 = True
+            except ValueError as e:
+                try:
+                    self.item = ipaddress.ip_network(str
+                                                     (self.item, "utf-8"),
+                                                     strict=False)
+                    if isinstance(self.item, ipaddress.IPv4Network):
+                        self.isipv4cidr = True
+                    elif isinstance(self.item, ipaddress.IPv6Network):
+                        self.isipv6cidr = True
+                except ValueError as e2:
+                    if self.item[0] == '.' and len(self.item.split('.')) > 2:
+                        self.isdomain = True
+                    elif len(self.item.split('.')) > 1:  # It has a '.' in it
+                        self.ishostname = True
+                    else:
+                        raise ConfigException('Unknown dataset item: {0}'
+                                              .format(item))
+
+    def match(self, connectip):
+        '''Check if the connect IP is part of the dataset'''
+        source = ipaddress.ip_address(str(connectip, "utf-8"))
+        for item in self.dataset:
+            if item.isdomain or item.ishostname:
+                result = self.matchname(source)   # Match host/domains first
+                if result:
+                    return(result)
+            elif item.isipv4 or item.isipv4cidr:  # Then IPv4/6 addresses or
+                if isinstance(source, ipaddress.IPv4Address):  # networks
+                    return(self.match4(source))   # depending on the item type
+            elif item.isipv6 or item.isipv6cidr:  # and connect type
+                if isinstance(source, ipaddress.IPv6Address):
+                    return(self.match6(source))
+
+    def matchname(self, source):
+        '''Does source IP address relate to a domain/hostname in the dataset'''
+        match = False
+        matchone = False
+        negativeone = False
+        matchdomain = False
+        negativedomain = False
+        ptrlist = self.getptr(source)
+        for item in self.dataset:
+            if item.isdomain:
+                for ptr in ptrlist:
+                    # Strip the leading '.' off the domain name for exact match
+                    if item.item[1:] == ptr[-len(item.item)+1:]:
+                        matchdomain = True
+                        negativedomain = item.negative
+            elif item.ishostname:
+                for ptr in ptrlist:
+                    if item.item == ptr:
+                        matchone = True
+                        negativeone = item.negative
+        if matchdomain and not negativedomain:
+            match = True
+        if matchone and not negativeone:
+            return True
+        if matchone and negativeone:
+            match = False
+        return(match)
+
+    def getptr(self, source):
+        '''Get validated PTR name of IP address'''
+        results = []
+        s = Session()
+        ptrnames = s.dns(source.reverse_pointer, 'PTR')
+        for name in ptrnames:
+            if isinstance(source, ipaddress.IPv4Address):
+                ips = s.dns(name, 'A')
+                for ip in ips:
+                    ip = ipaddress.IPv4Address(str(ip, 'UTF-8'))
+                    if ip == source:
+                        results.append(name)
+            if isinstance(source, ipaddress.IPv6Address):
+                ips = s.dns(name, 'AAAA')
+                for ip in ips:
+                    ip = ipaddress.IPv6Address(str(ip, 'UTF-8'))
+                if ip == source:
+                    results.append(name)
+        return results
+
+    def match4(self, source):
+        '''Is the source IP related to a IPv4 address/network in the dataset'''
+        match = False
+        matchone = False
+        negativeone = False
+        matchcidr = False
+        negativecidr = False
+        for item in self.dataset:
+            if item.isipv4:
+                if source == item.item:
+                    matchone = True
+                    negativeone = item.negative
+            elif item.isipv4cidr:
+                if source in item.item:
+                    matchcidr = True
+                    negativecidr = item.negative
+        if matchcidr and not negativecidr:
+            match = True
+        if matchone and not negativeone:
+            return True
+        if matchone and negativeone:
+            match = False
+        return(match)
+
+    def match6(self, source):
+        '''Is the source IP realted to a IPv6 address/network in the dataset'''
+        match = False
+        matchone = False
+        negativeone = False
+        matchcidr = False
+        negativecidr = False
+        for item in self.dataset:
+            if item.isipv6:
+                if source == item.item:
+                    matchone = True
+                    negativeone = item.negative
+            elif item.isipv6cidr:
+                if source in item.item:
+                    matchcidr = True
+                    negativecidr = item.negative
+        if matchcidr and not negativecidr:
+            match = True
+        if matchone and not negativeone:
+            return True
+        if matchone and negativeone:
+            match = False
+        return(match)
+
+
 def _processConfigFile(filename=None, configdata=None, useSyslog=1,
                       useStderr=0):
    '''Load the specified config file, exit and log errors if it fails,
    otherwise return a config dictionary.'''

-    import config
-    if configdata == None: configdata = config.defaultConfigData
-    if filename != None:
+    from . import config
+    if configdata is None:
+        configdata = config.defaultConfigData
+    if filename is not None:
        try:
            _readConfigFile(filename, configdata)
-        except Exception, e:
+        except Exception as e:
            raise
            if useSyslog:
                syslog.syslog(e.args[0])
@@ -71,7 +240,7 @@ def _processConfigFile(filename = None, configdata = None, useSyslog = 1,
            sys.exit(1)
    return(configdata)

-####################
+
 def _find_boolean(item):
    if type(item) == int:
        item = str(item)
@@ -84,22 +253,56 @@ def _find_boolean(item):
    return item


+def _make_authserv_id(as_id):
+    """Determine AuthservID if needed"""
+    if as_id == 'HOSTNAME':
+        as_id = socket.gethostname()
+    return as_id
+
+
 def _dataset_to_list(dataset):
    """Convert a dataset (as defined in dkimpymilter.8) and return a python
       list of values."""
-    if not isinstance(dataset, basestring):
-        # If it was a csl, it's already a list, we only need to remove the name
-        # from the first value
+    if not isinstance(dataset, str):
+        # If it was a csl with more than one value, it's already a list, we
+        # only need to remove the name from the first value.
        if dataset[0][:4] == 'csl:':
            dataset[0] = dataset[0][4:]
        for item in dataset:
            dataset[dataset.index(item)] = item.strip().strip(',')
        return dataset
+    elif isinstance(dataset, str):
+        if dataset[0] == '/' or dataset[:5] == 'file:':
+            # This is a flat file dataset
+            ds = []
+            if dataset[0] == '/':
+                dsname = dataset
+            if dataset[:5] == 'file:':
+                dsname = dataset[5:]
+            dsf = open(dsname, 'r')
+            for line in dsf.readlines():
+                if line[0] != '#':
+                    if len(line.split(':')) == 1:
+                        ds.append(line.strip())
                    else:
-        raise dkim.ParameterError('Unimplmented dataset type')
+                        for element in line.split(':'):
+                            ds.append(element.strip().strip(':'))
+            dsf.close()
+            return ds
+        # If it's a str and csl, it has one value and we return a list
+        if dataset[:4] == 'csl:':
+            return [dataset[4:].strip().strip(',')]
+        else:
+            return [dataset.strip().strip(',')]
+        if dataset[-3:] == '.db' or dataset[:3] == 'db:':
+            #  This is a Sleepycat (Oracle) DB  dataset, which we dont support
+            raise dkim.ParameterError('Unsupported dataset db datase: {0}'
+                                      .format(type(dataset)))
+
+    raise dkim.ParameterError('Unimplmented dataset type: {0}'
+                              .format(type(dataset)))
+

-###############################################################
-commentRx = re.compile(r'^(.*)#.*$')
 def _readConfigFile(path, configData=None, configGlobal={}):
    '''Reads a configuration file from the specified path, merging it
    with the configuration data specified in configData.  Returns a
@@ -107,8 +310,10 @@ def _readConfigFile(path, configData = None, configGlobal = {}):
    read from path.'''

    debugLevel = configGlobal.get('debugLevel', 0)
-    if debugLevel >= 5: syslog.syslog('readConfigFile: Loading "%s"' % path)
-    if configData == None: configData = {}
+    if debugLevel >= 5:
+        syslog.syslog('readConfigFile: Loading "%s"' % path)
+    if configData is None:
+        configData = {}
    nameConversion = {
        'AuthservID': 'str',
        'Syslog': 'bool',
@@ -125,32 +330,43 @@ def _readConfigFile(path, configData = None, configGlobal = {}):
        'Selector': 'str',
        'SelectorEd25519': 'str',
        'Canonicalization': 'str',
+        'InternalHosts': 'dataset',
+        'IntHosts': 'bool',
+        'DiagnosticDirectory': 'str',
+        'MacroList': 'dataset',
+        'MacroListVerify': 'dataset',
+        'DNSOverride': 'str',
+        'debugLevel': 'int'
        }

    #  check to see if it's a file
    try:
        mode = os.stat(path)[0]
-    except OSError, e:
-        syslog.syslog(syslog.LOG_ERR,'ERROR stating "%s": %s' % ( path, e.strerror ))
+    except OSError as e:
+        syslog.syslog(syslog.LOG_ERR, 'ERROR stating "%s": %s'
+                      % (path, e.strerror))
        return(configData)
    if not stat.S_ISREG(mode):
-        syslog.syslog(syslog.LOG_ERR,'ERROR: is not a file: "%s", mode=%s' % ( path, oct(mode) ))
+        syslog.syslog(syslog.LOG_ERR, 'ERROR: is not a file: "%s", mode=%s'
+                      % (path, oct(mode)))
        return(configData)

    #  load file
    fp = open(path, 'r')
    while 1:
        line = fp.readline()
-        if not line: break
+        if not line:
+            break

        #  parse line
        line = line.split('#', 1)[0].strip()
-        if not line: continue
+        if not line:
+            continue
        data = line.split()
        if len(data) != 2:
            if len(data) == 1:
                if debugLevel >= 1:
-                    syslog.syslog('Configuration item "%s" not defined in file "%s"'
+                    syslog.syslog('Config item "%s" not defined in file "%s"'
                                  % (line, path))
        if len(data) == 1:
            name = data
@@ -163,23 +379,34 @@ def _readConfigFile(path, configData = None, configGlobal = {}):

        #  check validity of name
        conversion = nameConversion.get(name)
-        if conversion == None:
-            syslog.syslog('ERROR: Unknown name "%s" in file "%s"' % ( name, path ))
+        if conversion is None:
+            syslog.syslog('ERROR: Unknown name "%s" in file "%s"'
+                          % (name, path))
            continue

-        if debugLevel >= 5: syslog.syslog('readConfigFile: Found entry "%s=%s"'
+        if debugLevel >= 5:
+            syslog.syslog('readConfigFile: Found entry "%s=%s"'
                          % (name, value))
        if conversion == 'bool':
            configData[name] = _find_boolean(value)
        elif conversion == 'str':
+            if isinstance(value, list):
+                configData[name] = line.split(None, 1)[1]
+            else:
                configData[name] = str(value)
        elif conversion == 'int':
            configData[name] = int(value)
        elif conversion == 'dataset':
            configData[name] = _dataset_to_list(value)
        else:
-            syslog.syslog(str('name: ' + name + ' value: ' + value + ' conversion: ' + conversion))
+            syslog.syslog(str('name: ' + name + ' value: ' + value +
+                              ' conversion: ' + conversion))
            configData[name] = conversion(value)
    fp.close()
+    try:
+        configData['AuthservID'] = _make_authserv_id(configData.get('AuthservID', 'HOSTNAME'))
+        configData['IntHosts'] = HostsDataset(configData['InternalHosts'])
+    except:
+        pass

    return(configData)
@@ -0,0 +1,168 @@
+## @package dnsplug
+# Provide a higher level interface to pydns or dnspython (or other provider).
+# NOT RELEASED: this is a proposed API and implementation.
+# Goals - work with both pydns and dnspython (and possibly other libraries)
+# at a simplied level.
+# TODO:
+# 1. map exceptions to common dnsplug.DNSError exception (with
+#    original exception saved as a member).
+# 2. include dict based implementation (handy for test suites)
+# 3. move implementations to subpackages to enable autoselect on first call.
+
+## Maximum number of CNAME records to follow
+MAX_CNAME = 10
+
+## Lookup DNS records by label and RR type.
+# The response can include records of other types that the DNS
+# server thinks we might need.  FIXME: empty result
+# could mean NXDOMAIN or NOANSWER.
+# @param name the DNS label to lookup
+# @param qtype the name of the DNS RR type to lookup
+# @param tcpfallback if False, raise exception instead of TCP fallback
+# @return a list of ((name,type),data) tuples
+def DNSLookup(name, qtype, tcpfallback=True, timeout=30):
+    raise NotImplementedError('No supported dns library found')
+
+class Session(object):
+  """A Session object has a simple cache with no TTL that is valid
+   for a single "session", for example an SMTP conversation."""
+  def __init__(self):
+    self.cache = {}
+
+  ## Additional DNS RRs we can safely cache.
+  # We have to be careful which additional DNS RRs we cache.  For
+  # instance, PTR records are controlled by the connecting IP, and they
+  # could poison our local cache with bogus A and MX records.  
+  # Each entry is a tuple of (query_type,rr_type).  So for instance,
+  # the entry ('MX','A') says it is safe (for milter purposes) to cache
+  # any 'A' RRs found in an 'MX' query.
+  SAFE2CACHE = frozenset((
+    ('MX','MX'), ('MX','A'),
+    ('CNAME','CNAME'), ('CNAME','A'),
+    ('A','A'),
+    ('AAAA','AAAA'),
+    ('PTR','PTR'),
+    ('NS','NS'), ('NS','A'),
+    ('TXT','TXT'),
+    ('SPF','SPF')
+  ))
+
+  ## Cached DNS lookup.
+  # @param name the DNS label to query
+  # @param qtype the query type, e.g. 'A'
+  # @param cnames tracks CNAMES already followed in recursive calls
+  def dns(self, name, qtype, cnames=None):
+    """DNS query.
+
+    If the result is in cache, return that.  Otherwise pull the
+    result from DNS, and cache ALL answers, so additional info
+    is available for further queries later.
+
+    CNAMEs are followed.
+
+    If there is no data, [] is returned.
+
+    pre: qtype in ['A', 'AAAA', 'MX', 'PTR', 'TXT', 'SPF']
+    post: isinstance(__return__, types.ListType)
+    """
+    result = self.cache.get( (name, qtype) )
+    cname = None
+
+    if not result:
+        safe2cache = Session.SAFE2CACHE
+        for k, v in DNSLookup(name, qtype):
+            if k == (name, 'CNAME'):
+                cname = v
+            if (qtype,k[1]) in safe2cache:
+                self.cache.setdefault(k, []).append(v)
+        result = self.cache.get( (name, qtype), [])
+    if not result and cname:
+        if not cnames:
+            cnames = {}
+        elif len(cnames) >= MAX_CNAME:
+            #return result    # if too many == NX_DOMAIN
+            raise DNSError('Length of CNAME chain exceeds %d' % MAX_CNAME)
+        cnames[name] = cname
+        if cname in cnames:
+            raise DNSError('CNAME loop')
+        result = self.dns(cname, qtype, cnames=cnames)
+    return result
+
+def DNSLookup_pydns(name, qtype, tcpfallback=True, timeout=30):
+    try:
+	# FIXME: To be thread safe, we create a fresh DnsRequest with
+	# each call.  It would be more efficient to reuse
+	# a req object stored in a Session.
+        req = DNS.DnsRequest(name, qtype=qtype, timeout=timeout)
+        resp = req.req()
+        #resp.show()
+        # key k: ('wayforward.net', 'A'), value v
+        # FIXME: pydns returns AAAA RR as 16 byte binary string, but
+        # A RR as dotted quad.  For consistency, this driver should
+        # return both as binary string.
+        #
+        if resp.header['tc'] == True:
+          if not tcpfallback:
+              raise DNS.DNSError('DNS: Truncated UDP Reply, SPF records should fit in a UDP packet')
+          try:
+              req = DNS.DnsRequest(name, qtype=qtype, protocol='tcp',
+                        timeout=timeout)
+              resp = req.req()
+          except DNS.DNSError as x:
+              raise DNS.DNSError('TCP Fallback error: ' + str(x))
+        return [((a['name'], a['typename']), a['data']) for a in resp.answers]
+    except IOError as x:
+        raise DNS.DNSError('DNS: ' + str(x))
+
+def DNSLookup_dnspython(name,qtype,tcpfallback=True,timeout=30):
+  retVal = []
+  try:
+    # FIXME: how to disable TCP fallback in dnspython if not tcpfallback?
+    answers = dns.resolver.query(name, qtype)
+    for rdata in answers:
+      if qtype == 'A' or qtype == 'AAAA':
+        retVal.append(((name, qtype), rdata.address))
+      elif qtype == 'MX':
+        retVal.append(((name, qtype), (rdata.preference, rdata.exchange)))
+      elif qtype == 'PTR':
+        retVal.append(((name, qtype), rdata.target.to_text(True)))
+      elif qtype == 'TXT' or qtype == 'SPF':
+        retVal.append(((name, qtype), rdata.strings))
+  except dns.resolver.NoAnswer:
+    pass
+  except dns.resolver.NXDOMAIN:
+    pass
+  return retVal
+
+try:
+    # prefer dnspython (the more complete library)
+    import dns
+    import dns.resolver  # http://www.dnspython.org
+    import dns.exception
+
+    if not hasattr(dns.rdatatype,'SPF'):
+      # patch in type99 support
+      dns.rdatatype.SPF = 99
+      dns.rdatatype._by_text['SPF'] = dns.rdatatype.SPF
+
+    DNSLookup = DNSLookup_dnspython
+except:
+    import DNS    # http://pydns.sourceforge.net
+
+    if not hasattr(DNS.Type, 'SPF'):
+        # patch in type99 support
+        DNS.Type.SPF = 99
+        DNS.Type.typemap[99] = 'SPF'
+        DNS.Lib.RRunpacker.getSPFdata = DNS.Lib.RRunpacker.getTXTdata
+
+    # Fails on Mac OS X? Add domain to /etc/resolv.conf
+    DNS.DiscoverNameServers()
+
+    DNSLookup = DNSLookup_pydns
+
+if __name__ == '__main__':
+  import sys
+  s = Session()
+  for n,t in zip(*[iter(sys.argv[1:])]*2):
+    print(n,t)
+    print(s.dns(n,t))
@@ -16,41 +16,79 @@
 # with this program; if not, write to the Free Software Foundation, Inc.,
 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

-def drop_privileges(milterconfig):
-    import os
+
+def fold(header):
+    """Fold a header line into multiple crlf-separated lines at column 72.
+    Borrowed from dkimpy and updated to only add \n instead of \r\n because
+    that's what the milter protocol wants.
+
+    >>> text(fold(b'foo'))
+    'foo'
+    >>> text(fold(b'foo  '+b'foo'*24).splitlines()[0])
+    'foo  '
+    >>> text(fold(b'foo'*25).splitlines()[-1])
+    ' foo'
+    >>> len(fold(b'foo'*25).splitlines()[0])
+    72
+    """
+    i = header.rfind(b"\r\n ")
+    if i == -1:
+        pre = b""
+    else:
+        i += 3
+        pre = header[:i]
+        header = header[i:]
+    maxleng = 72
+    while len(header) > maxleng:
+        i = header[:maxleng].rfind(b" ")
+        if i == -1:
+            j = maxleng
+        else:
+            j = i + 1
+        pre += header[:j] + b"\n   "
+        header = header[j:]
+    return pre + header
+
+
+def user_group(userid):
+    """Return user and group from UserID"""
    import grp
    import pwd
-    import syslog

-    if os.getuid() != 0:
-        if milterconfig.get('Syslog'):
-            syslog.syslog('drop_privileges: Not running as root. Cannot drop permissions.')
-        return
-
-    # Figure out if user and group are specified
-    userstr = milterconfig.get('UserID')
-    userlist = userstr.split(':')
+    userlist = userid.split(':')
    if len(userlist) == 1:
        gidname = userlist[0]
    else:
        gidname = userlist[1]
-    uidname = userlist[0]
-
    # Get the uid/gid from the name
-    running_uid = pwd.getpwnam(uidname).pw_uid
+    running_uid = pwd.getpwnam(userlist[0]).pw_uid
    running_gid = grp.getgrnam(gidname).gr_gid
+    return running_uid, running_gid
+
+
+def drop_privileges(milterconfig):
+    import os
+    import syslog
+
+    if os.getuid() != 0:
+        if milterconfig.get('Syslog'):
+            syslog.syslog('drop_privileges: Not root. No action taken.')
+        return
+
+    # Get user and group
+    uid, gid = user_group(milterconfig.get('UserID'))

    # Remove group privileges
    os.setgroups([])

    # Try setting the new uid/gid
-    os.setgid(running_gid)
-    os.setuid(running_uid)
+    os.setgid(gid)
+    os.setuid(uid)

    # Set umask
    old_umask = os.umask(milterconfig.get('UMask'))

-#################
+
 class ExceptHook:
    def __init__(self, useSyslog=1, useStderr=0):
        self.useSyslog = useSyslog
@@ -68,33 +106,70 @@ class ExceptHook:
                sys.stderr.write(line)


-####################
 def setExceptHook():
    import sys
    sys.excepthook = ExceptHook(useSyslog=1, useStderr=1)

-####################
+
 def write_pid(milterconfig):
    """Write PID in pidfile.  Will not overwrite an existing file."""
    import os
    import syslog
-    if not os.path.isfile(milterconfig.get('PidFile')):
+    pidfile = milterconfig.get('PidFile')
+    if pidfile is None:
+        return
+    if not os.path.isfile(pidfile):
        pid = str(os.getpid())
        try:
-            f = open(milterconfig.get('PidFile'), 'w')
+            f = open(pidfile, 'w')
        except IOError as e:
+            if str(e)[:35] == '[Errno 2] No such file or directory':
+                piddir = pidfile.rsplit('/', 1)[0]
+                os.mkdir(piddir)
+                user, group = user_group(milterconfig.get('UserID'))
+                os.chown(piddir, user, group)
+                f = open(pidfile, 'w')
                if milterconfig.get('Syslog'):
-                syslog.syslog('Unable to write pidfle {0}.  IOError: {1}'.format(milterconfig.get('PidFile'), e))
+                    syslog.syslog('PID dir created: {0}'.format(piddir))
+            else:
+                if milterconfig.get('Syslog'):
+                    syslog.syslog('Unable to write pidfle {0}.  IOError: {1}'
+                                  .format(pidfile, e))
                raise
        f.write(pid)
        f.close()
+        user, group = user_group(milterconfig.get('UserID'))
+        os.chown(pidfile, user, group)
    else:
        if milterconfig.get('Syslog'):
-            syslog.syslog('Unable to write pidfle {0}.  File exists.'.format(milterconfig.get('PidFile')))
-        raise RuntimeError('Unable to write pidfle {0}.  File exists.'.format(milterconfig.get('PidFile')))
+            syslog.syslog('Unable to write pidfle {0}.  File exists.'
+                          .format(pidfile))
+        raise RuntimeError('Unable to write pidfle {0}.  File exists.'
+                           .format(pidfile))
    return pid

-####################
+
+def own_socketfile(milterconfig, sockname=None):
+    """If socket is Unix socket, chown to UserID before dropping privileges"""
+    import os
+    user, group = user_group(milterconfig.get('UserID'))
+    offset = None
+    if sockname is None:
+        sockname = milterconfig.get('Socket')
+    if sockname is None:
+        return
+    if sockname[:1] == '/':
+        offset = 0
+    elif sockname[:6] == "local:":
+        offset = 6
+    elif sockname[:5] == "unix:":
+        offset = 5
+
+    if offset is not None:
+        if os.path.exists(sockname[offset:]):
+            os.chown(sockname[offset:], user, group)
+
+
 def read_keyfile(milterconfig, keytype):
    """Read private key from file."""
    import syslog
@@ -107,7 +182,8 @@ def read_keyfile(milterconfig, keytype):
        keylist = f.readlines()
    except IOError as e:
        if milterconfig.get('Syslog'):
-            syslog.syslog('Unable to read keyfile {0}.  IOError: {1}'.format(keyfile, e))
+            syslog.syslog('Unable to read keyfile {0}.  IOError: {1}'
+                          .format(keyfile, e))
        raise
    f.close()
    key = ''
@@ -11,9 +11,9 @@ UMask			007

 # Sign for example.com with key in /etc/dkimkeys/dkim.key using
 # selector '2007' (e.g. 2007._domainkey.example.com)
-Domain			example.com
-KeyFile			/etc/mail/dkim.key
-Selector		default
+#Domain			example.com
+#KeyFile			/etc/mail/dkim.key
+#Selector		default

 # Commonly-used options; the commented-out versions show the defaults.
 #Canonicalization	relaxed/simple
@@ -127,7 +127,6 @@
 .rm #[ #] #H #V #F C
 .\" ========================================================================
 .\"
-.IX Title "dkimpy-milter 8"
 .TH dkimpyy-milter 8
 .SH NAME
 .B dkimpy
@@ -156,7 +155,7 @@ values, or to a file that contains them, or a database containing the data.

 Some data sets require that the value contain more than one entry.  How this
 is done depends on which data set type is used.  Not all these datasets are
-currently used by dkimp-milter.  See
+currently used by dkimpy-milter.  See
 .B dkimpy-milter.conf(5)
 for details about specific options and which dataset types they use.

@@ -169,17 +168,7 @@ one per line.  If a line contains whitespace-separated values, then the
 line is presumed to define a key and its corresponding value.  Blank lines
 are ignored, and the hash ("#") character denotes the start of a comment.
 If a value contains multiple entries, the entries should be separated by
-colons. [Not implemented yet]
-.TP
-.I b)
-If the string begins with "refile:", then the remainder of the string is
-presumed to specify a file that contains a set of patterns, one per line,
-and their associated values.  The pattern is taken as the start of the line
-to the first whitespace, and the portion after that whitespace is taken as
-the value to be used when that pattern is matched.  Patterns are simple
-wildcard patterns, matching all text except that the asterisk ("*") character
-is considered a wildcard.  If a value contains multiple entries, the entries
-should be separated by colons. [Not implemented yet]
+colons.
 .TP
 .I c)
 If the string begins with "db:" and the program was compiled with
@@ -196,11 +185,11 @@ is compiled in).  [Not implemented yet]
 .TP
 .I i)
 If the string contains none of these prefixes but starts with a slash ("/")
-character, it is presumed to be a flat file as described above.  [Not implemented yet]
+character, it is presumed to be a flat file as described above.
 .TP
 .I j)
 If the string begins with "csl:", the string is treated as a comma-separated
-list as described in m) below.  [Not implemented yet]
+list as described in m) below.
 .TP
 .I l)
 If the string begins with "mdb:", it refers to a directory that contains
@@ -279,7 +268,7 @@ proposal, and Cisco's
 .B Internet Identified Mail
 (IIM) proposal.
 .SH VERSION
-This man page covers version 0.9.2 of
+This man page covers version 1.1.0 of
 .I dkimpy-milter.
 .SH COPYRIGHT
 Copyright (c) 2005-2008, Sendmail, Inc. and its suppliers.  All rights
@@ -288,7 +277,7 @@ reserved.
 Copyright (c) 2009-2013, 2015, The Trusted Domain Project.
 All rights reserved.

-Copyright (c) 2018 Scott Kitterman <scott@kitterman.com>
+Copyright (c) 2018, 2019 Scott Kitterman <scott@kitterman.com>
 .SH SEE ALSO
 .I dkimpy-milter.conf(5), sendmail(8)
 .P
@@ -302,4 +291,6 @@ RFC6376 - DomainKeys Identified Mail
 .P
 RFC7601 - Message Header Field for Indicating Message Authentication Status
 .P
-draft-ietf-dcrup-dkim-crypto - A new cryptographic signature method for DKIM
+RFC8301 - Cryptographic Algorithm and Key Usage Update to DomainKeys Identified Mail (DKIM)
+.P
+RFC8463 - A New Cryptographic Signature Method for DomainKeys Identified Mail (DKIM)
@@ -127,16 +127,13 @@
 .rm #[ #] #H #V #F C
 .\" ========================================================================
 .\"
-.IX Title "dkimpy-milter.conf 5"
 .TH dkimpy-milter.conf 5 "2018-02-12"
 .SH "NAME"
 dkimpy-milter \- Python milter for DKIM signing and validation
 .SH "VERSION"
-.IX Header "VERSION"
 0\.9\.2

 .SH "DESCRIPTION"
-.IX Header "DESCRIPTION"
 .I dkimpy-milter(8)
 implements the
 .B DKIM
@@ -160,18 +157,15 @@ The provided setup.py installs this configuration file in /etc or
 Command line invocation of parameters as is done by OpenDKIM is not supported.

 .SH "USAGE"
-.IX Header "USAGE"
 Usage:
  dkimpy-milter [/etc/dkimpy-milter.conf]

 .SH "OTHER DOCUMENTATION"
-.IX Header "OTHER DOCUMENTATION"
 This documentation assumes you have read Postfix's README_FILES/MILTER_README
 (or Sendmail equivalent) and are generally familiar with Domain Keys Identified
 Mail (DKIM).  See RFC 6376 for details.

 .SH "SYNOPSIS"
-.IX Header "SYNOPSIS"

 dkimpy-milter operates with a default installed configuration file and 
 set of default configuration options that are used if the configuration file
@@ -181,14 +175,12 @@ files can be used directly.  Not all OpenDKIM options are supported.  If an
 unsupported option from OpenDKIM is specified, an error will be raised.

 .SH "DESCRIPTION"
-.IX Header "DESCRIPTION"

 Configuration options are described here and in the configuration file 
 provided with the package.  The provided setup.py installs this configuration 
 file in /etc or /usr/local/etc.

 .SH "OPTIONS"
-.IX Header "OPTIONS"

 .TP
 .I AuthservID (string)
@@ -215,18 +207,12 @@ The value may include two different canonicalizations separated by a
 slash ("/") character, in which case the first will be applied to the
 header and the second to the body.

-.TP
-.I Diagnostics (Boolean)
-Requests the inclusion of "z=" tags in signatures, which encode the
-original header field set for use by verifiers when diagnosing verification
-failures.  Not recommended for normal operation. [dkimpy-milter specific: also
-increases the verbosity of Syslog logging if enabled.]
-
 .TP
 .I DiagnosticDirectory (string)
 Directory into which to write diagnostic reports when message verification
-fails on a message bearing a "z=" tag.  If not set (the default), these files
-are not generated.
+fails.  If not set (the default), these files are not generated.  [Unlike
+OpenDKIM, this applies to all messages, not just  on messages bearing a "z=" tag
+because dkimpy does not yet support "z=".]

 .TP
 .I Domain (dataset)
@@ -261,13 +247,50 @@ all messages.  Ignored if a
 is defined. [KeyTable NOT IMPLEMENTED]

 .TP
-.I KeyFileEd25119 (string)
+.I KeyFileEd25519 (string)
 Gives the location of a Ed25519 private key to be used for Ed25519 signing
 all messages.  File is the Base64 encoded output of RFC 8032 Ed25519 private Key
 generation (as used in dkimpy).  Ignored if a 
 .I KeyTableEd25519
 is defined.  [KeyTableEd25519 NOT IMPLEMENTED]

+.TP
+.I MacroList (dataset)
+Defines a set of MTA-provided
+.I macros
+that should be checked to see if the sender has been determined to be a
+local user and therefore whether or not the message should be signed.  If
+a
+.I value
+is specified matching a macro name in the data set, the value of the macro
+must match a value specified (matching is case-sensitive), otherwise the
+macro must be defined but may contain any value.  The set is empty by
+default, meaning macros are not considered when making the sign-verify
+decision.  The general format of the value is
+.I value1[|value2[|...]];
+if one or more value is defined then the macro must be set to one of the
+listed values, otherwise the macro must be set but can contain any
+value.
+
+In order for the macro and its value to be available to the filter for
+checking, the MTA must send it during the protocol exchange.  This is either
+accomplished via manual configuration of the MTA to send the desired macros
+or, for MTA/filter combinations that support the feature, the filter can
+request those macros that are of interest.  The latter is a feature negotiated
+at the time the filter receives a connection from the MTA and its availability
+depends upon the version of milter used to compile the filter and the version
+of the MTA making the connection.
+
+.TP
+.I MacroListVerify (dataset)
+Defines a set of MTA-provided
+.I macros
+that should be checked to see if the sender has been determined to be an
+external source and therefore whether or not the message should be signed.
+Entries in this data set follow the same form as those of the
+.I MacroList
+option above.  [this option is not inhereted from OpenDKIM]  
+
 .TP
 .I Mode (string)
 Selects operating modes.  The string is a concatenation of characters that
@@ -288,6 +311,13 @@ be set:
 (b) KeyTable, SigningTable, no Domain, no KeyFile, no Selector;
 [fooTable options NOT IMPLEMENTED]

+.TP 
+.I DNSOverride (string)
+Provide a text string that a verifying milter should use instead of
+consulting the DNS on each message.  This is useful primarily for
+testing purposes in environments where it is awkward to modify the
+system DNS resolution.  It should not be used in production.
+
 .TP
 .I PeerList (dataset)
 Identifies a set of "peers" that identifies clients whose connections
@@ -308,7 +338,7 @@ will be checked. [PeerList NOT IMPLEMENTED - included for reference only]
 .TP
 .I PidFile (string)
 Specifies the path to a file that should be created at process start
-containing the process ID.
+containing the process ID.  If not specified, no such file will be created.

 .TP
 .I Selector (string)
@@ -374,7 +404,7 @@ Log via calls to
 using the named facility.  The facility names are the same as the ones
 allowed in
 .I syslog.conf(5).
-The default is "mail".  [Hardcoded to default for now]
+The default is "mail".

 .TP
 .I SyslogSuccess (Boolean)
@@ -410,7 +440,6 @@ unless an alternate
 is specified.

 .SH "AUTHORS"
-.IX Header "AUTHORS"
 \ddkimpy-milter\fR was written by Scott Kitterman <scott@kitterman.com>.
 It is based on dkimpy-milter.py  Copyright (c) 2001-2013 Business Management Systems, Inc.
 Copyright (c) 2013-2015 Stuart D. Gathman
@@ -1,4 +1,4 @@
-#! /usr/bin/python
+#! /usr/bin/python3
 # dkimpy-milter: A DKIM signing/verification Milter application
 # Author: Scott Kitterman <scott@kitterman.com>
 # Copyright 2018 Scott Kitterman
@@ -18,26 +18,32 @@

 from setuptools import setup
 import os
-import dkimpy_milter

 description = "Domain Keys Identified Mail (DKIM) signing/verifying milter for Postfix/Sendmail."

+kw = {}  # Work-around for lack of 'or' requires in setuptools.
+try:
+    import dns
+    kw['install_requires'] = ['dkimpy>=0.7', 'pymilter', 'authres>=1.1.0', 'PyNaCl', 'dnspython']
+except ImportError:  # If PyDNS is not installed, prefer dnspython
+    kw['install_requires'] = ['dkimpy>=0.7', 'pymilter', 'authres>=1.1.0', 'PyNaCl', 'PyDNS']
+
 setup(
    name='dkimpy-milter',
-    version=dkimpy_milter.__version__,
+    version='1.0.1',
    author='Scott Kitterman',
    author_email='scott@kitterman.com',
    url='https://launchpad.net/dkimpy-milter',
    description=description,
    download_url = "https://pypi.python.org/pypi/dkimpy-milter",
    classifiers= [
-        'Development Status :: 3 - Alpha',
+        'Development Status :: 5 - Production/Stable',
        'Environment :: No Input/Output (Daemon)',
        'Intended Audience :: System Administrators',
        'License :: OSI Approved :: GNU General Public License (GPL)',
        'Natural Language :: English',
        'Operating System :: POSIX',
-        'Programming Language :: Python :: 2 :: Only',
+        'Programming Language :: Python :: 3 :: Only',
        'Topic :: Communications :: Email :: Mail Transport Agents',
        'Topic :: Communications :: Email :: Filters',
        'Topic :: Security',
@@ -52,9 +58,9 @@ setup(
    data_files=[(os.path.join('share', 'man', 'man5'),
        ['man/dkimpy-milter.conf.5']), (os.path.join('share', 'man', 'man8'),
        ['man/dkimpy-milter.8']), ('etc', ['etc/dkimpy-milter.conf']),
-        (os.path.join('/lib', 'systemd', 'system'),
-        ['system/dkimpy-milter.service']),(os.path.join('/etc', 'init.d'),
+        (os.path.join('lib', 'systemd', 'system'),
+        ['system/dkimpy-milter.service']),(os.path.join('etc', 'init.d'),
        ['system/dkimpy-milter'])],
-    install_requires = ['dkimpy>=0.7', 'pymilter', 'authres>=1.0.2', 'PyNaCl'],
    zip_safe = False,
+    **kw
 )
@@ -13,8 +13,6 @@
 # Provides:          dkim-milter dkim-milter-python dkimpy-milter
 # Required-Start:    $remote_fs $syslog $network $time
 # Required-Stop:     $remote_fs $syslog $network
-# Should-Start:
-# Should-Stop:
 # Default-Start:     2 3 4 5
 # Default-Stop:      0 1 6
 # Short-Description: dkimpy-milter
@@ -31,7 +29,7 @@ NAME=dkimpy-milter
 DESC="Python DKIM Milter"
 USER=dkimpy-milter
 GROUP=dkimpy-milter
-SOCKET=$RUNDIR/dkimpy-milter.pid
+SOCKET=$RUNDIR/dkimpy-milter.sock

 test -x $DAEMON || exit 0

@@ -70,8 +68,8 @@ case "$1" in
 		fi
 	fi

-	start-stop-daemon --start --chuid $USER --background --quiet --pidfile \
-		$RUNDIR/$NAME.pid --exec $DAEMON $sysconfdir/$NAME.conf
+        start-stop-daemon --start --quiet --pidfile $RUNDIR/$NAME.pid --startas \
+                $DAEMON $sysconfdir/$NAME.conf --name $NAME --test > /dev/null \
 	echo "$NAME."
 	;;
  stop)
@@ -1,11 +1,12 @@
 [Unit]
 Description=DKIMpy Milter
-After=syslog.target network.target
+Documentation=man:dkimpy-milter(8) man:dkimpy-milter.conf(5) 
+After=network.target

 [Service]
 Type=simple
 PIDFile=/var/run/dkimpy-milter/dkimpy-milter.pid
-ExecStart=/usr/local/bin/dkimpy-milter 
+ExecStart=/usr/local/bin/dkimpy-milter /usr/local/etc/dkimpy-milter.conf 

 [Install]
 WantedBy=multi-user.target
@@ -0,0 +1,32 @@
+This directory contains example systemd unit files for running a
+supervised, socket-activated instance of dkimpy-milter.
+
+There are several advantages of using socket activation:
+
+- dkimpy-milter never runs with elevated privileges, they are dropped
+  before any dkimpy-milter code is executed.
+   
+- The socket is opened before dkimpy-milter runs.  This means that
+  clients can connect() to the socket immediately.  So even if there
+  is a delay in dkimpy-milter startup, or in libmilter itself, the
+  connection will not fail.
+  
+- You can set the privileges of a listening Unix-domain socket by an
+  override of ListenGroup= in dkimpy-milter.socket (see
+  systemd.unit(5) for how to override).  This lets you control who has
+  access to the daemon with finer granularity than is available with
+  dkimpy-milter on its own.
+  
+- dkimpy-milter will not consume system resources if it is not used.
+
+- A fully-supervised dkimpy-milter needs no PIDFile, UMask, UserID, or
+  Socket configuation.  This eliminates common race conditions and
+  startup failures, and simplifies the resulting configuration file.
+  
+There is one downside to using socket activation:
+
+- it will only work on systems where libmilter can support connection
+  strings like "fd:3".  This has been supported on Debian and derived
+  systems since sendmail 8.14.4-6 (before Debian Jessie, in early
+  2014), see for example:
+  https://sources.debian.org/src/sendmail/8.15.2-8/debian/patches/socket_activation.patch/
@@ -0,0 +1,11 @@
+[Unit]
+Description=DKIMpy Milter
+Documentation=man:dkimpy-milter(8) man:dkimpy-milter.conf(5)
+Requires=dkimpy-milter.socket
+
+[Service]
+ExecStart=/usr/bin/dkimpy-milter /etc/dkimpy-milter.conf
+User=dkimpy-milter
+
+[Install]
+Also=dkimpy-milter.socket
@@ -0,0 +1,12 @@
+[Unit]
+Description=DKIMpy Milter socket
+Documentation=man:dkimpy-milter(8) man:dkimpy-milter.conf(5)
+
+[Socket]
+ListenStream=/run/dkimpy-milter/dkimpy-milter.sock
+SocketMode=0660
+# override SocketGroup to grant access to members of another system group:
+SocketGroup=dkimpy-milter
+
+[Install]
+WantedBy=sockets.target
@@ -0,0 +1,12 @@
+-- -*- lua -*-
+for _, keytype in ipairs({"ed25519", "rsa"}) do
+   for _, func in ipairs({"signing", "verify"}) do
+      mt.echo("testing "..keytype.." "..func)
+      conn = mt.connect("unix:"..keytype.."."..func..".sock")
+      if conn == nil then
+         error("mt.connect() failed "..keytype.." "..func)
+      end
+      mt.disconnect(conn)
+      mt.echo(keytype.." "..func.." complete")
+   end
+end
@@ -0,0 +1,40 @@
+-- -*- lua -*-
+for _, keytype in ipairs({"ed25519", "rsa"}) do
+   for _, func in ipairs({"signing", "verify"}) do
+      mt.echo("testing "..keytype.." "..func)
+      conn = mt.connect("unix:"..keytype.."."..func..".sock")
+      if conn == nil then
+         error("mt.connect() failed "..keytype.." "..func)
+      end
+      if mt.conninfo(conn, "localhost", "127.0.0.1") ~= nil then
+         error("mt.conninfo() failed "..keytype.." "..func)
+      end
+      if mt.getreply(conn) ~= SMFIR_CONTINUE then
+         error("mt.conninfo() unexpected reply "..keytype.." "..func)
+      end
+
+      if mt.test_action(conn, SMFIF_ADDHDRS) then
+         print("could add headers "..keytype.." "..func)
+      else
+         error("mt.test_action() says could not add headers "..keytype.." "..func)
+      end
+
+      if mt.test_action(conn, SMFIF_CHGHDRS) then
+         print("could change headers "..keytype.." "..func)
+      else
+         error("mt.test_action() says could not change headers "..keytype.." "..func)
+      end
+
+-- -- FIXME: this part of the test fails, as apparently the
+-- -- dkimpy-milter claims the right to change the body of a message,
+-- -- even though it shouldn't.  How can we fix the negotiation?
+--      if mt.test_action(conn, SMFIF_CHGBODY) then
+--         error("mt.test_action() says could change body "..keytype.." "..func)
+--      else
+--         print("could not change body "..keytype.." "..func)
+--      end
+
+      mt.disconnect(conn)
+      mt.echo(keytype.." "..func.." test complete")
+   end
+end
@@ -0,0 +1,100 @@
+-- -*- lua -*-
+
+msg = {
+   ['headers'] = {
+      ['From'] = 'Alice <alice@example.net>',
+      ['Message-Id'] = '<dkimpy-milter-test-02@example.net>',
+      ['To'] = 'Bob <bob@example.biz>',
+      ['Date'] = 'Mon, 18 Feb 2019 08:32:50 -0500',
+      ['Subject'] = 'Signing test',
+      ['Content-Type'] = 'text/plain',
+   },
+   ['body'] = "This is a test!\r\n",
+}
+
+-- returns miltertest connection object
+function connect_and_send (sockname, headers, body)
+   conn = mt.connect(sockname)
+   if conn == nil then
+      error "mt.connect() failed"
+   end
+   if mt.conninfo(conn, "localhost", "127.0.0.1") ~= nil then
+      error "mt.conninfo() failed"
+   end
+   if mt.getreply(conn) ~= SMFIR_CONTINUE then
+      error "mt.conninfo() unexpected reply"
+   end
+
+   -- mt.macro(conn, SMFIC_MAIL, "i", "simple-message")
+   if mt.mailfrom(conn, "<alice@example.net>") ~= nil then
+      error "mt.mailfrom() failed"
+   end
+   if mt.getreply(conn) ~= SMFIR_CONTINUE then
+      error "mt.mailfrom() unexpected reply"
+   end
+   -- mt.rcptto() is called implicitly
+
+   -- send headers
+   for key,value in pairs(headers) do
+      if mt.header(conn, key, value) ~= nil then
+         error("mt.header(" .. key .. ") failed")
+      end
+      if mt.getreply(conn) ~= SMFIR_CONTINUE then
+         error("mt.header(" .. key .. ") unexpected reply")
+      end
+   end
+   -- send EOH
+   if mt.eoh(conn) ~= nil then
+      error "mt.eoh() failed"
+   end
+   if mt.getreply(conn) ~= SMFIR_CONTINUE then
+      error "mt.eoh() unexpected reply"
+   end
+
+   -- send body
+   if mt.bodystring(conn, body) ~= nil then
+      error "mt.bodystring() failed"
+   end
+   if mt.getreply(conn) ~= SMFIR_CONTINUE then
+      error "mt.bodystring() unexpected reply"
+   end
+   -- end of message; let the filter react
+   if mt.eom(conn) ~= nil then
+      error "mt.eom() failed"
+   end
+   reply = mt.getreply(conn)
+   if reply ~= SMFIR_CONTINUE then
+      error ("mt.eom() unexpected reply: " .. reply)
+   end
+   return conn
+end
+
+for _, keytype in ipairs({"ed25519", "rsa"}) do
+   mt.echo("testing "..keytype)
+   signing = connect_and_send("unix:"..keytype..".signing.sock", msg.headers, msg.body)
+   -- verify that a test header field got added
+   if not mt.eom_check(signing, MT_HDRINSERT) then
+      error "no header added by signer"
+   end
+
+   signature = mt.getheader(signing, "DKIM-Signature", 0)
+
+   mt.disconnect(signing)
+
+   mt.echo("DKIM-Signature: " .. signature)
+
+   msg.headers['DKIM-Signature'] = signature
+
+   verify = connect_and_send("unix:"..keytype..".verify.sock", msg.headers, msg.body)
+
+   if not mt.eom_check(verify, MT_HDRINSERT) then
+      error "no header added in verify"
+   end
+
+   authres = mt.getheader(verify, "Authentication-Results", 0)
+   mt.echo("Authentication-Results: "..authres)
+
+   mt.disconnect(verify)
+
+   mt.echo(keytype.." complete")
+end
@@ -0,0 +1,2 @@
+#!/bin/sh
+python3 -m dkimpy_milter "$@"
@@ -0,0 +1,84 @@
+#!/bin/bash
+
+set -e
+WORKDIR=$(mktemp -d)
+TESTDIR=$(realpath "$(dirname "$0")")
+DKIMPY_MILTER=${DKIMPY_MILTER:-"$TESTDIR/dkimpy-milter"}
+KEY_TYPES=(ed25519 rsa)
+
+cd "$WORKDIR"
+
+printf "Testing %s from directory %s\n" "$DKIMPY_MILTER" "$WORKDIR"
+
+for keytype in "${KEY_TYPES[@]}"; do
+    dknewkey --ktype "$keytype" "testkey.$keytype"
+    if [ "$keytype" = ed25519 ]; then
+        keyfile=KeyFileEd25519
+        selector=SelectorEd25519
+    else
+        keyfile=KeyFile
+        selector=Selector
+    fi
+    cat > "$keytype.signing.conf" <<EOF
+Domain example.net
+$keyfile testkey.$keytype.key
+$selector testkey
+Socket unix:$keytype.signing.sock
+PidFile $keytype.signing.pid
+Mode s
+UserID $(id --name --user):$(id --name --group)
+EOF
+
+    cat > "$keytype.verify.conf" <<EOF
+Socket unix:$keytype.verify.sock
+PidFile $keytype.verify.pid
+Mode v
+DNSOverride $(cat testkey.$keytype.dns)
+UserID $(id --name --user):$(id --name --group)
+EOF
+done
+
+cleanup() {
+    echo cleaning up jobs:
+    jobs
+    for keytype in "${KEY_TYPES[@]}"; do
+        for func in signing verify; do
+            if [ -s "$keytype.$func.pid" ] && kill -0 "$(cat "$keytype.$func.pid")"; then
+                kill "$(cat $keytype.$func.pid)"
+            fi
+        done
+    done
+    wait
+    for keytype in "${KEY_TYPES[@]}"; do
+        for func in signing verify; do
+            errdata="$keytype.$func.stderr"
+            if [ -s "$errdata" ]; then
+                printf -- "-> %s:\n" "$errdata"
+                cat "$errdata"
+                printf -- "-> end %s\n" "$errdata"
+            fi
+        done
+    done
+    rm -rf "$WORKDIR"
+}
+
+for keytype in "${KEY_TYPES[@]}"; do
+    for func in signing verify; do
+        PYTHONPATH="$(dirname "$TESTDIR")" "$DKIMPY_MILTER" "$keytype.$func.conf" 2>"$keytype.$func.stderr" &
+    done
+done
+trap cleanup EXIT
+
+# ugly ugly (how are we supposed to know that the milters are all ready?):
+sleep 2
+
+# uses miltertest from opendkim:
+for x in ${TESTS:-"$TESTDIR"/*.miltertest}; do
+    if ! [ -e "$x" ]; then
+        if [ -e "$TESTDIR/$x" ]; then
+            x="$TESTDIR/$x"
+        fi
+    fi
+    printf -- "-> running %s...\n" "$x"
+    miltertest -s "$x"
+done
Author	SHA1	Message	Date
Daniel Kahn Gillmor	7092874729	Enable sd_listen_fds(3)-style socket-activation support I've added straightforward systemd unit files in system/socket-activation/ that make use of this approach, and a README.md in the same location that describes the tradeoffs.	2019-02-21 19:22:11 -05:00
Daniel Kahn Gillmor	25fdd3b81c	Do not create PidFile by default By default, avoid creating a PIDFile. PIDFiles are racy and potentially dangerous. Modern system supervision systems don't need them, because they manage the process groups directly. If the configuration file doesn't specify a PidFile, dkimpy-milter shouldn't try to create one.	2019-02-21 19:22:11 -05:00
Daniel Kahn Gillmor	9d5316ca0e	Handle defaults for Socket differently We want to be able to select the default for Socket differently in the future. This change augments the API for dkimpy_milter.util.own_socketfile() by adding an optional sockname argument. This is a backward-compatible change. If we aren't committed to API stability for this function, we could make a more invasive change that would probably be a more reasonable API going forward, but this is probably good enough.	2019-02-21 19:22:11 -05:00
Daniel Kahn Gillmor	ea09bab1a8	Convert __init__.py to python3 The main work here is about bytes vs. strings. This work was confusing for several reasons: * pymilter thinks that headers are all strings, but body is bytes * dkimpy wants to deal with bytes objects generally (though it accepts a string object as an ed25519 secret key for some reason, despite requiring bytes as an RSA secret key) * authres.AuthenticationResultsHeader object converts easily to a string, but has no direct bytes conversion. meanwhile, it wants its arguments as strings, but will accept them if they are bytes and convert them with something like str(), which leaves weird cruft like "header.a=b'ed25519-sha256'" * dkimpy_milter/utils.py contains fold() which expects bytes * self.fp needs to accumulate the on-the-wire version of the message as a whole (so it needs to be bytes). That means converting the headers. Header names and values are US-ASCII, per §2.2 of RFC 5322, so they should be convertible cleanly, but we still have to convert them explicitly so that python knows the right thing to do. At any rate, tests/runtests all passes with these changes, and the output for both Authentication-Results: and DKIM-Signature headers looks the same.	2019-02-21 19:22:11 -05:00
Daniel Kahn Gillmor	391b5352f3	Convert mostly to python3 (still need strings/bytes conversions) This covers conversion of the whole project to python3, except for the strings/bytes distinction in __init__.py, which i'm leaving for a second commit. The changes in this commit are intended to be relatively uncontroversial, so that the following commit contains the tricky bits.	2019-02-21 19:22:09 -05:00
Daniel Kahn Gillmor	ad8f396db0	Expand test suite to cover RSA as well as ed25519	2019-02-21 19:21:38 -05:00
Daniel Kahn Gillmor	479820a07d	tests: test DKIM signing and verification This test makes use of DNSOverride and the new verifying milter to ensure that signatures can be verified properly. It doesn't test the actual interaction with the public DNS, but getting that kind of test to work on arbitrary platforms might be more trouble than it's worth. I note that the DNSOverride only works as long as testkey.dns is a single line, which is fine for ed25519, but maybe not for RSA.	2019-02-21 19:21:38 -05:00
Daniel Kahn Gillmor	7bfb87fab7	Set up __main__.py, use it in tests This allows us to invoke dkimpy-milter as "python -m dkimpy_milter dkimpy-milter.conf", which makes running the test suite easier.	2019-02-21 19:21:38 -05:00
Daniel Kahn Gillmor	5c1d5d6e52	tests: Run a verifying milter as well as a signing milter Having a verifying milter will come in handy when we want to test both sides of the DKIM process.	2019-02-21 19:21:38 -05:00
Daniel Kahn Gillmor	ae31730593	check for actions claimed by the filter	2019-02-21 19:21:38 -05:00
Daniel Kahn Gillmor	72ed000ccf	simple testing framework	2019-02-21 19:21:38 -05:00
Daniel Kahn Gillmor	b3db013754	config: Reassemble strings sensibly If a string-based configuation entry had whitespace in it, it would be reassembled via a round-trip through the python interpreter, resulting in a line like this: PidFile /home/dkimpy-milter/pid file produces a string like "['/home/dkimpy-milter/pid', 'file']", which is clearly wrong. I don't want to encourage people to use paths or other strings with whitespace in them, but if we're going to fail on them we should be failing explicitly, not doing a weird transformation that will just break. This is concretely useful for the DNSOverride mechanism, which is where i ran into the problem when trying to set up testing that could work without setting up an emulated DNS system.	2019-02-21 19:21:38 -05:00
Daniel Kahn Gillmor	bd1d25d83e	Set up correct AuthservID defaults Without this fix, a verifying dkimpy-milter that has no explicit AuthservID produces the following crashing behavior as it tries to create the authres header: Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/Milter/__init__.py", line 772, in <lambda> milter.set_eom_callback(lambda ctx: ctx.getpriv().eom()) File "…/dkimpy_milter/__init__.py", line 199, in eom h = fold(str(h)) File "/usr/lib/python2.7/dist-packages/authres/core.py", line 476, in __str__ return ''.join((self.HEADER_FIELD_NAME, ': ', self.header_value())) File "/usr/lib/python2.7/dist-packages/authres/core.py", line 496, in header_value return ''.join(strs)	2019-02-21 19:21:38 -05:00
Daniel Kahn Gillmor	1c6030024d	add DNSOverride configuration for testing	2019-02-21 19:21:38 -05:00
Daniel Kahn Gillmor	71c0c3f20a	Avoid failing to chown non-existent Unix-domain sockets Changing ownership of sockets that doesn't exist isn't a great practice. A better approach would be to apply os.chown() to the file descriptor of the open socket, but at the very least dkimpy-milter shouldn't crash the way it currently does if the socket isn't already present.	2019-02-21 19:21:38 -05:00
Daniel Kahn Gillmor	a9a6893c89	Handle unix: socket prefix the same as local: sendmail's milter.c treats these two declarations the same way, so what we do for one should also be done for the other.	2019-02-21 19:21:38 -05:00
Daniel Kahn Gillmor	bb44f36519	When Socket is absolute path, do not strip leading / This appears to just be an untested codepath.	2019-02-21 19:21:38 -05:00
Daniel Kahn Gillmor	9e11b75ec3	Avoid AttributeError on simple connection and disconnection Without this patch, this simple script for miltertest: ---- conn = mt.connect("unix:milter.sock") if conn == nil then error "mt.connect() failed" end if mt.conninfo(conn, nil, "unspec") ~= nil then error "mt.conninfo() failed" end if mt.getreply(conn) ~= SMFIR_CONTINUE then error "mt.conninfo() unexpected reply" end mt.disconnect(conn) ---- Produces the following error: Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/Milter/__init__.py", line 702, in connect_callback return m.connect(hostname,family,hostaddr) File "/usr/lib/python2.7/dist-packages/Milter/__init__.py", line 173, in wrapper rc = func(self,*args) File "/home/dkg/src/dkimpy-milter/dkimpy-milter/dkimpy_milter/__init__.py", line 64, in connect self.receiver = self.getsymval('j').strip() AttributeError: 'NoneType' object has no attribute 'strip'	2019-02-21 19:21:38 -05:00
Daniel Kahn Gillmor	f60ea12e86	Prefer dnspython over PyDNS in setup.py README and dkimpy_milter/dnsplug.py both prefer dnspython if available, over PyDNS. setup.py should order the preferences in the same way.	2019-02-21 19:21:36 -05:00
Daniel Kahn Gillmor	e872bd44b0	ignore emacs turds	2019-02-19 18:03:54 -05:00
Scott Kitterman	51c8fdcb6c	Bump version to 1.0.1, update TODO, set release date	2019-02-11 15:14:11 -05:00
Scott Kitterman	aa4dadc22f	* Reorder milter start and dropping privileges so permissions on Unix socket are correct (LP: 1797720)	2019-02-11 15:09:34 -05:00
Scott Kitterman	b1abbf9d61	- Make domain checks case insensitive for determining if signing should be done (LP: #1815311)	2019-02-11 14:55:35 -05:00
Scott Kitterman	ea2b612e8d	- Add information on Ed25519 key creation to README (LP: #1815313 )	2019-02-11 14:23:55 -05:00
Scott Kitterman	5945e818ca	- Add additional Sendmail configuration information to README from OpenDKIM update based on input from Дилян Палаузов (LP: #1801619)	2019-02-11 13:32:37 -05:00
Scott Kitterman	f38fed3bee	Rip out unused whichbd module in preparation for python3 port	2019-02-11 03:16:53 -05:00
Scott Kitterman	06948b3dbc	Update references in man/dkimpy-milter.8	2019-02-09 22:20:01 -05:00
Scott Kitterman	e951ab6c5e	Remove obsolete .IX macro from man pages Conflicts: man/dkimpy-milter.conf.5	2019-02-09 22:19:41 -05:00
Scott Kitterman	03c86a2b08	Fix grammar error in README	2019-02-09 22:18:11 -05:00
Scott Kitterman	2cda1758c1	Fix spelling error in README	2019-02-09 22:17:53 -05:00
Scott Kitterman	a188bd3960	Deleted reference to obsolete syslog target in unit file	2018-05-11 14:31:15 -04:00
Scott Kitterman	c91a12f0d1	Documentation updates for 1.0.0 release	2018-05-11 14:29:15 -04:00
Scott Kitterman	286ffbb6c9	Add release date for 0.9.7 to CHANGES	2018-03-19 01:07:52 -04:00
Scott Kitterman	ec3252c367	- Minor sysv init improvments	2018-03-15 23:59:03 -04:00
Scott Kitterman	a2ff03727d	- Put version directly in setup.py and do not import dkimpy_milter to ease install via pip	2018-03-15 23:44:31 -04:00
Scott Kitterman	af4b05e242	- Add missing documentation key to system/dkimpy-milter.service	2018-03-15 20:49:35 -04:00
Scott Kitterman	6509eaad35	- Made sysv init executable	2018-03-15 20:44:16 -04:00
Scott Kitterman	f9483fea8c	- Added protection for malformed From addresses. If the From does not at least have an '@' in the address, then the signing domain is not extracted and the message will not be signed	2018-03-15 20:42:49 -04:00
Scott Kitterman	7a3a7bfb43	Bump version to 0.9.6	2018-03-12 22:08:07 -04:00
Scott Kitterman	8a0e1bdd97	- Fixed typo in path for fallback location of the config file if one is not provided	2018-03-12 22:03:45 -04:00
Scott Kitterman	e3005aa723	Move OversignHeaders up earlier on TODO.	2018-03-12 22:03:36 -04:00
Scott Kitterman	45d3ba13ca	Added more to README about first run with systemd	2018-03-11 00:42:22 -05:00
Scott Kitterman	f05309437f	Fix merge conflict	2018-03-11 00:28:08 -05:00
Scott Kitterman	d4499f6990	Fixed typo in package installation section of README	2018-03-11 00:27:19 -05:00
Scott Kitterman	7d87309f4b	Fixed typo in package installation section of README	2018-03-11 00:24:39 -05:00
Scott Kitterman	1d8c309da9	Fix setup.py install locations so they are installed correctly and drop unneeded README changes.	2018-03-10 20:06:21 -05:00
Scott Kitterman	4d5961e4d5	Bump version	2018-03-10 19:52:29 -05:00
Scott Kitterman	59448e8e57	- Add information to README about manually putting init scripts in the right locations	2018-03-10 19:51:29 -05:00
Scott Kitterman	695de0db14	- Add conf file location to systemd unit file	2018-03-10 19:43:37 -05:00
Scott Kitterman	dfd6fa68c3	Changelog: release 0.9.5 (Beta 1)	2018-03-10 19:06:55 -05:00
Scott Kitterman	86eb152f93	Enhanced signature verification logging to provide more useful information, added signing success logging, and more PEP 8	2018-03-10 19:02:37 -05:00
Scott Kitterman	126966e110	- Update Authentication Results result comment not to mention key size for ed25519 signatures, since it's irrelevant	2018-03-10 18:18:01 -05:00
Scott Kitterman	5d8d47cd52	- Fixed install_requires so either dnspython (preferred if neither is installed) or PyDNS satisfies the install requirements	2018-03-10 17:49:22 -05:00
Scott Kitterman	1843ca6244	- Added support for SyslogSuccess option - Rationalized logging to be much less verbose unless SyslogSuccess or debugLevel are set - default is generally start/stop/errors only	2018-03-10 16:06:22 -05:00
Scott Kitterman	f9358d594c	Delete unused import	2018-03-10 15:36:40 -05:00
Scott Kitterman	a8aa422b03	Post pep-8 cleanup	2018-03-10 15:34:56 -05:00
Scott Kitterman	9836f2c9c2	Update TODO	2018-03-10 03:00:59 -05:00
Scott Kitterman	70606ac58c	pep8 and a few other cleanups	2018-03-10 02:45:35 -05:00
Scott Kitterman	6348bdcdc7	Cleanup, indentation, pyflakes	2018-03-10 00:52:45 -05:00
Scott Kitterman	fd39384e78	Fix for DiagnosticDirectory	2018-03-09 23:49:57 -05:00
Scott Kitterman	924c96d555	- Added example in README to show use of MacroList* to separate inbound and outbound mail streams	2018-03-09 22:50:07 -05:00
Scott Kitterman	efeabd19d3	Added support for MacroListVerify option	2018-03-09 22:39:55 -05:00
Scott Kitterman	a9b8a44bfc	Add support for MacroList option	2018-03-09 21:53:58 -05:00
Scott Kitterman	daaa6aada7	Fix option name typo in man/dkimpy-milter.conf.5	2018-03-09 20:45:57 -05:00
Scott Kitterman	e795db7c69	Start 0.9.5: Beta 1 (updated Alpha -> Beta warning in README and trove classifiers)	2018-03-09 18:08:42 -05:00
Scott Kitterman	977fac5fae	Add 0.9.4 release date	2018-03-09 17:13:17 -05:00
Scott Kitterman	36ff60d8d3	- Added support for DiagnosticDirectory and updated dkimpy-milter specifics in dkimpy-milter.conf.5	2018-03-09 17:10:48 -05:00
Scott Kitterman	4769bde19c	- Added support for InternalHosts option (ipaddress and either dns (dnspython) or pydns (DNS) modules are now required)	2018-03-09 16:29:49 -05:00
Scott Kitterman	e6021dd960	Add dnsplug.py so either DNS or dns can be used for host/domain based dataset processing	2018-03-09 13:51:36 -05:00
Scott Kitterman	9d28ab3567	Add MTA integration information and update depenency installation in README.	2018-03-08 00:37:34 -05:00
Scott Kitterman	df19aa081e	- Added support for AuthservID option	2018-03-04 15:15:37 -05:00
Scott Kitterman	2e9d0f607f	Update man pages for newly implemented features	2018-03-04 14:00:18 -05:00
Scott Kitterman	fb32a8fe0b	Implement detection of type db datasets, but not used yet	2018-03-04 13:56:06 -05:00
A. Schulze	3e57876361	- Make RSA signatures in dkimpy-milter optional, so dkimpy-milter can be added after an existing DKIM signing application to add an Ed25519 signature (Thanks to A. Schulze for the patch)	2018-03-04 13:33:32 -05:00
Scott Kitterman	7683fa7187	- Fixed a bug where dkim fail might be reported as pass when verifying multiple signatures and a previous signature had passed	2018-03-04 13:18:06 -05:00
Scott Kitterman	fc893a62c3	- Added information about creating a dedicated user and PID file directory creation to README	2018-03-03 14:54:43 -05:00
Scott Kitterman	c01c04b83f	- Fix header folding to use \n only to align with milter protocol requirements	2018-03-03 14:39:20 -05:00
Scott Kitterman	fc583a6e3c	Updated TODO for work done in 0.9.2/3	2018-03-03 14:37:37 -05:00
Scott Kitterman	ebfb0b5fc3	Fix crash when verifying if domain for signing was not set	2018-03-03 10:42:59 -05:00
Scott Kitterman	48a44916e7	Create PID directory if it is missing	2018-03-03 01:45:15 -05:00
Scott Kitterman	5a81886a5e	Start 0.9.4	2018-03-03 00:59:43 -05:00
Scott Kitterman	5e2cff5e5d	- Fold added authres header fields - Fix pidfile permissions - Fix socket setup sequence so Unix sockets work	2018-03-02 16:14:46 -05:00
Scott Kitterman	5886edda42	Fixup file dataset support	2018-03-02 15:04:19 -05:00
Scott Kitterman	e4a17d7be6	Ignore errors parsing broken authres header fields	2018-03-02 15:02:31 -05:00
Scott Kitterman	96978c2747	Bump minimum authres version to 1.1.0 due to known issues with 1.0.2	2018-03-02 06:52:21 -05:00
Scott Kitterman	77722a0ffd	Domain/KeyFile/Selector commented out by default - there is no useful default and not needed for verifying only milter	2018-02-26 11:55:00 -05:00
Scott Kitterman	ced16fda72	Fixup csl dataset and initial (untested) file dataset	2018-02-25 15:57:41 -05:00
Scott Kitterman	f381986f7a	Add more about isntallation options/instructions to README	2018-02-21 07:38:20 -05:00
Scott Kitterman	02ad614657	Bump version for next release	2018-02-19 17:32:55 -05:00