pax_global_header00006660000000000000000000000064134602777640014532gustar00rootroot0000000000000052 comment=7493562fce0b43f60e176a0822198722ad234a21 vrfydmn-0.11.0/000077500000000000000000000000001346027776400132765ustar00rootroot00000000000000vrfydmn-0.11.0/.gitignore000066400000000000000000000012721346027776400152700ustar00rootroot00000000000000# Byte-compiled / optimized / DLL files __pycache__/ *.py[cod] # C extensions *.so # Distribution / packaging .Python env/ build/ develop-eggs/ dist/ downloads/ eggs/ lib/ lib64/ parts/ sdist/ var/ *.egg-info/ .installed.cfg *.egg # PyInstaller # Usually these files are written by a python script from a template # before PyInstaller builds the exe, so as to inject date/other infos into it. *.manifest *.spec # Installer logs pip-log.txt pip-delete-this-directory.txt # Unit test / coverage reports htmlcov/ .tox/ .coverage .cache nosetests.xml coverage.xml # Translations *.mo *.pot # Django stuff: *.log # Sphinx documentation docs/_build/ # PyBuilder target/ # PyCharme IDE .idea/ vrfydmn-0.11.0/INSTALL000066400000000000000000000022531346027776400143310ustar00rootroot00000000000000Usage ===== Install libmilter and pymilter (the python package that wraps the C library). After that you may create a user milter with group milter. I have provided two init scripts. The vrfydmn.init is for systems that use sysvinit, the vrfydmn.openrc is for Gentoo users (as I am). You may edit these and specify options for the milter. Simply call the milter with --help to get an idea. Place vrfydmn into /usr/local/sbin. If you chose another path, you might need to adopt the path in the init script. You need to run the milter with -f or -l (see --help). In Postfix, you may add the milter with: non_smtpd_milters=inet:[::1]:30072 for scenario one and smtpd_milters=inet:[::1]:30072 for the submission instance. Usually found in master.cf or maybe a second instance. This depends on your system. LDAP ==== You can use LDAP. For this, you need to install python-ldap (with SASL support) For an example config file, see doc/relay_domains.cf Full documentation will come soon. Memcached ========= You can run LDAP combined with memcached. For this, add: -m 127.0.0.1:11211 as argument in the init script. Positive results are stored for one hour, negative for 60 seconds. vrfydmn-0.11.0/LICENSE000066400000000000000000001044621346027776400143120ustar00rootroot00000000000000GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007 Copyright (C) 2007 Free Software Foundation, Inc. Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The GNU General Public License is a free, copyleft license for software and other kinds of works. The licenses for most software and other practical works are designed to take away your freedom to share and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users. 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If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read . vrfydmn-0.11.0/README.md000066400000000000000000000047001346027776400145560ustar00rootroot00000000000000vrfydmn ======= Postfilx milter that rejects/fixes manipulated From:-header Background ========== 1st scenario ------------ If you run web servers that host virtual domains, you often define PHP settings that force a fixed enevelope-from address. Unfortunately many websites provide contact formulas that take the sender e-mail address and copy that with the PHP mail function to the From:-header. If you run a mail server that checks SPF/DKIM and finally DMARC, you can get into trouble, if the sender address belongs to a company that enforces a strict DMARC policy. If a remote server (and that could also be yours!) receives such a mail, the mail will be rejected, as your web server (or a relay server that handles mail from the web server) fails the SPF, DKIM and DMARC test. 2nd scenarion ------------- You provde mail services for customers that deliver their mail over submission. If you have infected PCs where bots are going to send mails over users account, they can fake the sender addresses. vrfydmn ======= This is a little milter that can i.e. run on a web server or a submission server. In the first scenario described, you may like to run the milter with a fix option. In this mode, it restores the From:-header with the envelope-from address and inserts a ne Reply-To:-header with the former From:-header. This will keep formulas working. For the second scenario described, you may want to run the milter with a hard reject, if the From:-address was faked. At the current stage of this milter, it reads a simple map file (I am using Postfix) containing all domains that the mail server is the final destionation. Each time a mail is sent, the From:-header is decoded and the e-mail address is split into local part and domain, where only the domain is taken for comparison. In fact, all domains from the map file are compared to the domain, which makes it easier with subdomains. If a domain was found in the mapped file, mail can pass, else it will either be rejected or modified depended of the mode the milters runs with. As domain maps might be very large, the file is only read at startup and kept in memory. You can send a -HUP signal to the milter to reload its maps and send a -USR1 signal to dump all domains to syslog (or stdout, if running in debug mode). 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SHELL = /bin/sh SOURCES = vrfydmn.8.txt vrfydmn_ldap.5.txt # Substitutions HTMLS= $(patsubst %.txt,%.html,$(SOURCES)) MANS= $(patsubst %.txt,%.man,$(SOURCES)) # Build Targets all: html man html: $(HTMLS) man: $(MANS) # Build commands %.html: %.txt asciidoc -b html5 $< %.man: %.txt a2x --doctype manpage --format manpage $< # Defaults .PHONY: clean clean: rm -f *.html *.1 *.5 *.8 vrfydmn-0.11.0/doc/man/000077500000000000000000000000001346027776400146165ustar00rootroot00000000000000vrfydmn-0.11.0/doc/man/man8/000077500000000000000000000000001346027776400154615ustar00rootroot00000000000000vrfydmn-0.11.0/doc/man/man8/vrfydmn.8000066400000000000000000000071501346027776400172420ustar00rootroot00000000000000.\" Manpage for vrfydmn. .\" Contact c@roessner.co to correct errors or typos. .TH man 8 "18 Dec 2014" "0.4" "vrfydmn man page" .SH NAME vrfydmn \- Milter that rejects a forged or modified RFC5322 from address .SH SYNOPSIS vrfydmn OPTIONS -f, --file FLATFILE and/or -l, --ldap LDAP_CONFIG .PP vrfydmn -h, --help .SH DESCRIPTION vrfydmn is a milter that can check a RFC5322 from address and compare it to a list of domains coming from a flat file or a LDAP connection. The domains provided should reflect the domains that your MX is a final destination for. If an address with a foreign domain component was found, the milter can either reject the mail or copy the given address to a RFC5322 Reply-To header (if none already was specified) and it restores the RCF5322 from header with the envelope-from (MAIL FROM) address. .PP The purpose is to reject mail that might be phishing mail due to stolen mail accounts or to prevent mail loss in cases, where the given address was under DMARC policy, i.e. Yahoo or AOL. .PP Web servers that provide hosting for several domains might have dozens of contact forms. Often they use a given e-mail address provides by a website visitor to use this address as a RFC5322 from address. If the web server is forwarding mail to a relay server that delivers mail to the internet, mails might get lost, as a remote MX might enforce DMARC policies. In such a case, a bounced mail could not be sent back to the original sender. .PP Normal use is on web servers, where you might already provide an enevelope from address with sendmail(8) -f or on the submission (port 587) side. .SH OPTIONS .TP .B -u, --user USER (default: milter) Run the milter with user USER .TP .B -g, --group GROUP (default: milter) Run the milter with group GROUP .TP .B -s, --socket SOCKET (default: inet6:30072@[::1]) Specify the socket the miler is listening on. This may be either an IPv4 or IPv6 socket. .TP Examples: .TP inet6:30072@[::1] .TP inet:10000@127.0.0.1 .TP .B -p, --pid PIDFILE (default: none) Specify a pid file, which is created upon startup. .TP .B -f, --file FLATEFILE (default: none) This file typically is a \fBpostfix\fR(8) map, i.e. relay_domains file. It should be a map with 2 columns. First column is the domain (the key) and the second column represents some value. The value is totally ignored in vrfydmn! If a flat file was given, the file can be refreshed during runtime by sending the SIGHUP signal and the result can be dumped to syslog (or standard out, if -d, --debug was given) with the SIGUSR1 signal. .TP .B -l, --ldap LDAP_CONFIG (default: none) This option specifies a LDAP configuration file. Settings found in this file will enable a persistent LDAP connection. See \fBvrfydmn_ldap\fR(5) for the syntax and available options .TP .B -m, --memcached SOCKET (default: none) A memcached can be wrapped around a LDAP connection. SOCKET is typically 127.0.0.1:11211. Adopt it to your needs, if you want to enable support for this option. .TP .B -f, --fix Instead of rejecting mails with a forged/modified RFC5322 from header, copy this header to a Reply-To field (if none already exists) and restore the from header field with the envelope-from (MAIL FROM) mail address. This option is recommended for web servers. .TP .B -d, --debug Run the milter in forground. In this mode, all information concerning an e-mail session will be dumped to standard out. It also will print out the result of the check. .SH SEE ALSO vrfydmn_ldap(5) .SH BUGS Normally RFC5322 from address may of the form mailbox-list. As this is a very uncommon case, the milter currently only picks the last found address for testing. .SH AUTHOR Christian Roessner (c@roessner.co) vrfydmn-0.11.0/doc/relay_domains.cf000066400000000000000000000005721346027776400172070ustar00rootroot00000000000000host = ldap://ldap.example.com/ usetls = Yes cacert = /etc/ssl/certs/ca-certificates.crt cert = /etc/ssl/certs/foo.example.com.pem key = /etc/ssl/private/foo.example.com.key.pem reqcert = demand base = ou=mailDomains,ou=it,dc=example,dc=com bindmethod = sasl saslmech = EXTERNAL scope = base filter = (&(objectClass=rnsMSPostfixGroup)(rnsMSVirtDomain=*%s)) result_attrs = ou vrfydmn-0.11.0/doc/vrfydmn.8000066400000000000000000000130421346027776400156210ustar00rootroot00000000000000'\" t .\" Title: vrfydmn .\" Author: [see the "AUTHOR" section] .\" Generator: DocBook XSL Stylesheets v1.78.1 .\" Date: 02/09/2015 .\" Manual: vrfydmn Manual .\" Source: vrfydmn 0.4 .\" Language: English .\" .TH "VRFYDMN" "8" "02/09/2015" "vrfydmn 0\&.4" "vrfydmn Manual" .\" ----------------------------------------------------------------- .\" * Define some portability stuff .\" ----------------------------------------------------------------- .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .\" http://bugs.debian.org/507673 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" ----------------------------------------------------------------- .\" * set default formatting .\" ----------------------------------------------------------------- .\" disable hyphenation .nh .\" disable justification (adjust text to left margin only) .ad l .\" ----------------------------------------------------------------- .\" * MAIN CONTENT STARTS HERE * .\" ----------------------------------------------------------------- .SH "NAME" vrfydmn \- reject an email message if the RFC5322 From:\-address does not comply\&. .SH "SYNOPSIS" .sp \fBvrfydmn\fR [\fIOPTIONS\fR] \fIFILE\fR .SH "DESCRIPTION" .sp In email everyone is free to specify any RFC5322 From:\-header address\&. Miscreants \(em virus authors, spammers and phishers \(em are aware of this fact\&. They forge the RFC5322 From:\-header address on purpose to impersonate someone that suits their goal\&. .sp Average users are not aware of this fact\&. They tend to believe a message really was sent by the person indicated in the RFC5322 From:\-header address\&. .sp vrfydmn verifies RFC5322 From:\-headers in mail messages\&. It compares a messages From:\-header field to a list of permitted sender domains assigned to the sender\&. If the address does not meet the expectations vrfydmn may either rectify the RFC5322 From:\-header or reject the message\&. .sp This program was created to control and reject phishing abuse on SMTP submission ports\&. It serves also to prevent mail loss in cases, when the given address was under DMARC policy, i\&.e\&. Yahoo or AOL\&. .SH "OPTIONS" .PP \fB\-u, \-\-user\fR \fIuser\fR (default: \fImilter\fR) .RS 4 Run vrfydmn as user \fIuser\fR\&. .RE .PP \fB\-g, \-\-group\fR \fIgroup\fR (default: \fImilter\fR) .RS 4 Run vrfydmn as group \fIuser\fR\&. .RE .PP \fB\-s, \-\-socket\fR \fIsocket\fR (default: \fIinet6:30072@[::1]\fR) .RS 4 Specifes the socket vrfydmn should listen on for incoming verification requests\&. The socket consists of three parts \- \fIprotocol\fR, \fIport\fR and \fIaddress\fR\&. .RE .PP \fIprotocol\fR .RS 4 Use \fIinet\fR as prefix to indicate an IPv4 socket e\&.g\&. \fIinet:10000@127\&.0\&.0\&.1\fR or \fIinet6\fR as prefix to indicate an IPv6 socket e\&.g\&. \fIinet6:30072@[::1]\fR\&. .RE .PP \fIport\fR .RS 4 Use numbers to indicate the port vrfydmn should establish its socket on e\&.g\&. \fI30072\fR\&. .RE .PP \fIaddress\fR .RS 4 Specify an IP address\&. The address type must correspond to the \fIprotocol\fR choosen\&. IPv6 addresses must be enclosed in square brackets e\&.g\&. \fI[address]\fR\&. .RE .PP \fB\-p, \-\-pid\fR \fIpidfile\fR (default: none) .RS 4 Specifies the name of a file in which vrfydmn should note its process id\&. .RE .PP \fB\-f, \-\-file\fR \fIfile\fR (default: none) .RS 4 This file typically is a postfix(8) map, i\&.e\&. relay_domains file\&. It should be a map with 2 columns\&. First column is the domain (the key) and the second column represents some value\&. The value is totally ignored in vrfydmn! If a flat file was given, the file can be refreshed during runtime by sending the SIGHUP signal and the result can be dumped to syslog (or standard out, if \-d, \-\-debug was given) with the SIGUSR1 signal\&. .RE .PP \fB\-l, \-\-ldap\fR \fIfile\fR (default: none) .RS 4 Specifies the path to a configuration file\&. The file holds options for LDAP queries\&. If specified vrfydmn will establish a persistent LDAP connection\&. See vrfydmn_ldap(5) for details\&. .RE .PP \fB\-m, \-\-memcached\fR \fIsocket\fR (default: none) .RS 4 Specifies a TCP socket to a memcache server\&. If enabled LDAP query results will be cached in the memcache\&. The socket must be specified as \fIaddress\fR and \fIport\fR separated by a colon e\&.g\&. \fI127\&.0\&.0\&.1:11211\fR\&. .RE .PP \fB\-f, \-\-fix\fR .RS 4 If specified vrfydmn will not reject messages with RFC5322 From:\-headers that fail verification\&. Instead it will attempt to fix them\&. It will copy the erroneous header to a Reply\-To:\-header (only if none already exists)\&. Then it will replace the existing From:\-header with the envelope\-sender address (MAIL From)\&. This option is recommended for web servers\&. .RE .PP \fB\-d, \-\-debug\fR .RS 4 This option is mainly for debugging and development purposes\&. If specified vrfydmn will not detach\&. It will run in foreground and output its activities to stdout\&. .RE .SH "SEE ALSO" .sp vrfydmn_ldap(5) .SH "BUGS" .sp There are no known bugs so far\&. Please submit bugs to https://github\&.com/croessner/vrfydmn/issues\&. .SH "AUTHOR" .sp Christian Roessner wrote the program\&. .sp Patrick Ben Koetter wrote this man page\&. .SH "RESOURCES" .sp vrfydmn\(cqs home is at https://github\&.com/croessner/vrfydmn\&. .SH "COPYING" .sp Copyright (C) 2014\-2015 Christian Roessner\&. Free use of this software is granted under the terms of the GNU General Public License (GPL)\&. vrfydmn-0.11.0/doc/vrfydmn.8.html000066400000000000000000000543171346027776400165760ustar00rootroot00000000000000 vrfydmn(8)

SYNOPSIS

vrfydmn [OPTIONS] FILE

DESCRIPTION

In email everyone is free to specify any RFC5322 From:-header address. Miscreants — virus authors, spammers and phishers — are aware of this fact. They forge the RFC5322 From:-header address on purpose to impersonate someone that suits their goal.

Average users are not aware of this fact. They tend to believe a message really was sent by the person indicated in the RFC5322 From:-header address.

vrfydmn verifies RFC5322 From:-headers in mail messages. It compares a messages From:-header field to a list of permitted sender domains assigned to the sender. If the address does not meet the expectations vrfydmn may either rectify the RFC5322 From:-header or reject the message.

This program was created to control and reject phishing abuse on SMTP submission ports. It serves also to prevent mail loss in cases, when the given address was under DMARC policy, i.e. Yahoo or AOL.

OPTIONS

-u, --user user (default: milter)

Run vrfydmn as user user.

-g, --group group (default: milter)

Run vrfydmn as group user.

-s, --socket socket (default: inet6:30072@[::1])

Specifes the socket vrfydmn should listen on for incoming verification requests. The socket consists of three parts - protocol, port and address.

protocol

Use inet as prefix to indicate an IPv4 socket e.g. inet:10000@127.0.0.1 or inet6 as prefix to indicate an IPv6 socket e.g. inet6:30072@[::1].

port

Use numbers to indicate the port vrfydmn should establish its socket on e.g. 30072.

address

Specify an IP address. The address type must correspond to the protocol choosen. IPv6 addresses must be enclosed in square brackets e.g. [address].

-p, --pid pidfile (default: none)

Specifies the name of a file in which vrfydmn should note its process id.

-f, --file file (default: none)

This file typically is a postfix(8) map, i.e. relay_domains file. It should be a map with 2 columns. First column is the domain (the key) and the second column represents some value. The value is totally ignored in vrfydmn! If a flat file was given, the file can be refreshed during runtime by sending the SIGHUP signal and the result can be dumped to syslog (or standard out, if -d, --debug was given) with the SIGUSR1 signal.

-l, --ldap file (default: none)

Specifies the path to a configuration file. The file holds options for LDAP queries. If specified vrfydmn will establish a persistent LDAP connection. See vrfydmn_ldap(5) for details.

-m, --memcached socket (default: none)

Specifies a TCP socket to a memcache server. If enabled LDAP query results will be cached in the memcache. The socket must be specified as address and port separated by a colon e.g. 127.0.0.1:11211.

-f, --fix

If specified vrfydmn will not reject messages with RFC5322 From:-headers that fail verification. Instead it will attempt to fix them. It will copy the erroneous header to a Reply-To:-header (only if none already exists). Then it will replace the existing From:-header with the envelope-sender address (MAIL From). This option is recommended for web servers.

-d, --debug

This option is mainly for debugging and development purposes. If specified vrfydmn will not detach. It will run in foreground and output its activities to stdout.

SEE ALSO

vrfydmn_ldap(5)

BUGS

There are no known bugs so far. Please submit bugs to https://github.com/croessner/vrfydmn/issues.

AUTHOR

Christian Roessner <c@roessner.co> wrote the program.

Patrick Ben Koetter <p@sys4.de> wrote this man page.

RESOURCES

vrfydmn’s home is at https://github.com/croessner/vrfydmn.

COPYING

Copyright (C) 2014-2015 Christian Roessner. Free use of this software is granted under the terms of the GNU General Public License (GPL).

vrfydmn-0.11.0/doc/vrfydmn.8.txt000066400000000000000000000101501346027776400164340ustar00rootroot00000000000000vrfydmn(8) =========== :doctype: manpage :man source: vrfydmn :man version: 0.4 :man manual: vrfydmn Manual NAME ---- vrfydmn - reject an email message if the RFC5322 From:-address does not comply. SYNOPSIS -------- *vrfydmn* ['OPTIONS'] 'FILE' DESCRIPTION ----------- In email everyone is free to specify any RFC5322 From:-header address. Miscreants -- virus authors, spammers and phishers -- are aware of this fact. They forge the RFC5322 From:-header address on purpose to impersonate someone that suits their goal. Average users are not aware of this fact. They tend to believe a message really was sent by the person indicated in the RFC5322 From:-header address. vrfydmn verifies RFC5322 From:-headers in mail messages. It compares a messages From:-header field to a list of permitted sender domains assigned to the sender. If the address does not meet the expectations vrfydmn may either rectify the RFC5322 From:-header or reject the message. This program was created to control and reject phishing abuse on SMTP submission ports. It serves also to prevent mail loss in cases, when the given address was under DMARC policy, i.e. Yahoo or AOL. OPTIONS ------- *-u, --user* 'user' (default: 'milter'):: Run vrfydmn as user 'user'. *-g, --group* 'group' (default: 'milter'):: Run vrfydmn as group 'user'. *-s, --socket* 'socket' (default: 'inet6:30072@[::1]'):: Specifes the socket vrfydmn should listen on for incoming verification requests. The socket consists of three parts - 'protocol', 'port' and 'address'. 'protocol':: Use 'inet' as prefix to indicate an IPv4 socket e.g. 'inet:10000@127.0.0.1' or 'inet6' as prefix to indicate an IPv6 socket e.g. 'inet6:30072@[::1]'. 'port':: Use numbers to indicate the port vrfydmn should establish its socket on e.g. '30072'. 'address':: Specify an IP address. The address type must correspond to the 'protocol' choosen. IPv6 addresses must be enclosed in square brackets e.g. '[address]'. *-p, --pid* 'pidfile' (default: none):: Specifies the name of a file in which vrfydmn should note its process id. *-f, --file* 'file' (default: none):: This file typically is a postfix(8) map, i.e. relay_domains file. It should be a map with 2 columns. First column is the domain (the key) and the second column represents some value. The value is totally ignored in vrfydmn! If a flat file was given, the file can be refreshed during runtime by sending the SIGHUP signal and the result can be dumped to syslog (or standard out, if -d, --debug was given) with the SIGUSR1 signal. *-l, --ldap* 'file' (default: none):: Specifies the path to a configuration file. The file holds options for LDAP queries. If specified vrfydmn will establish a persistent LDAP connection. See vrfydmn_ldap(5) for details. *-m, --memcached* 'socket' (default: none):: Specifies a TCP socket to a memcache server. If enabled LDAP query results will be cached in the memcache. The socket must be specified as 'address' and 'port' separated by a colon e.g. '127.0.0.1:11211'. *-f, --fix*:: If specified vrfydmn will not reject messages with RFC5322 From:-headers that fail verification. Instead it will attempt to fix them. It will copy the erroneous header to a Reply-To:-header (only if none already exists). Then it will replace the existing From:-header with the envelope-sender address (MAIL From). This option is recommended for web servers. *-d, --debug*:: This option is mainly for debugging and development purposes. If specified vrfydmn will not detach. It will run in foreground and output its activities to stdout. SEE ALSO -------- vrfydmn_ldap(5) BUGS ---- There are no known bugs so far. Please submit bugs to . AUTHOR ------ Christian Roessner wrote the program. Patrick Ben Koetter wrote this man page. RESOURCES --------- vrfydmn's home is at . COPYING ------- Copyright \(C) 2014-2015 Christian Roessner. Free use of this software is granted under the terms of the GNU General Public License (GPL). // vim: set ft=asciidoc: vrfydmn-0.11.0/doc/vrfydmn_ldap.5000066400000000000000000000123771346027776400166300ustar00rootroot00000000000000'\" t .\" Title: vrfydmn_ldap .\" Author: [see the "AUTHOR" section] .\" Generator: DocBook XSL Stylesheets v1.78.1 .\" Date: 02/09/2015 .\" Manual: vrfydmn Manual .\" Source: vrfydmn_ldap 0.4 .\" Language: English .\" .TH "VRFYDMN_LDAP" "5" "02/09/2015" "vrfydmn_ldap 0\&.4" "vrfydmn Manual" .\" ----------------------------------------------------------------- .\" * Define some portability stuff .\" ----------------------------------------------------------------- .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .\" http://bugs.debian.org/507673 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" ----------------------------------------------------------------- .\" * set default formatting .\" ----------------------------------------------------------------- .\" disable hyphenation .nh .\" disable justification (adjust text to left margin only) .ad l .\" ----------------------------------------------------------------- .\" * MAIN CONTENT STARTS HERE * .\" ----------------------------------------------------------------- .SH "NAME" vrfydmn_ldap \- lookup RFC5322 From:\-addresses in an LDAP database\&. .SH "SYNOPSIS" .sp \fBvrfydmn\fR \-l \fIldap:///etc/vrfydmn/ldap\&.cfg\fR .SH "DESCRIPTION" .sp vrfydmn uses lists and tables to lookup mail related informations\&. A lookup tables may be an LDAP database\&. .sp In order to use LDAP lookups, specify a path to a file holding LDAP connection and query configuration\&. The path must be given when \fBvrfydmn\fR is invoked on command line: .sp \fBvrfydmn\fR \-l \fIldap:///etc/vrfydmn/ldap\&.cfg\fR .SH "OPTIONS" .PP \fBbase\fR (default: None) .RS 4 The RFC2253 base DN at which to conduct the search, e\&.g\&. .sp .if n \{\ .RS 4 .\} .nf base = ou=maildomains,dc=example,dc=com .fi .if n \{\ .RE .\} .RE .PP \fBbindmethod\fR (default: None) .RS 4 The method used when binding to the LDAP server\&. Valid options are simple or sasl\&. .RE .PP \fBcacert\fR (default: None) .RS 4 Specifies the file that contains certificates for all of the Certificate Authorities the client will recognize\&. .sp .if n \{\ .RS 4 .\} .nf cacert = /etc/ssl/certs/cacerts\&.pem .fi .if n \{\ .RE .\} .RE .PP \fBcert\fR (default: None) .RS 4 Specifies the file that contains the client certificate\&. .sp .if n \{\ .RS 4 .\} .nf cert = /etc/ssl/certs/mail\&.example\&.com\-crt\&.pem .fi .if n \{\ .RE .\} .RE .PP \fBfilter\fR (default: None) .RS 4 The RFC2254 filter used to search the directory, e\&.g\&. .sp .if n \{\ .RS 4 .\} .nf filter = (domain=*) .fi .if n \{\ .RE .\} .RE .PP \fBhost\fR (default: None) .RS 4 The name of the host running the LDAP server, e\&.g\&. .sp .if n \{\ .RS 4 .\} .nf host = 127\&.0\&.0\&.1, ldap\&.example\&.com .fi .if n \{\ .RE .\} .RE .PP \fBkey\fR (default: None) .RS 4 Specifies the file that contains the private key that matches the certificate stored in the cert file\&. Currently, the private key must not be protected with a password, so it is of critical importance that the key file is protected carefully\&. .sp .if n \{\ .RS 4 .\} .nf key = /etc/ssl/private/mail\&.example\&.com\-key\&.pem .fi .if n \{\ .RE .\} .RE .PP \fBreqcert\fR (default: \fBdemand\fR) .RS 4 Specifies what checks to perform on server certificates in a TLS session, if any\&. The can be specified as one of the following keywords: .PP \fBnever\fR .RS 4 The client will not request or check any server certificate\&. .RE .PP \fBallow\fR .RS 4 The server certificate is requested\&. If no certificate is provided, the session proceeds normally\&. If a bad certificate is provided, it will be ignored and the session proceeds normally\&. .RE .PP \fBtry\fR .RS 4 The server certificate is requested\&. If no certificate is provided, the session proceeds normally\&. If a bad certificate is provided, the session is immediately terminated\&. .RE .PP \fBdemand\fR .RS 4 The server certificate is requested\&. If no certificate is provided, or a bad certificate is provided, the session is immediately terminated\&. This is the default setting\&. .RE .RE .PP \fBresult_attrs\fR (default: None) .RS 4 The name of the attribute whose value the query should return\&. .sp .if n \{\ .RS 4 .\} .nf result_attrs = domain .fi .if n \{\ .RE .\} .RE .PP \fBsaslmech\fR (default: None) .RS 4 The mechanism outgoing\(cqs LDAP client should use, when it sasl\-binds to the remote LDAP server\&. Valid options are currently PLAIN or EXTERNAL\&. .RE .PP \fBscope\fR (default: None) .RS 4 The LDAP search scope: sub, base, or one\&. .RE .PP \fBusetls\fR (default: No) .RS 4 A Boolean option to enable or disable usage of TLS when connecting to the LDAP server\&. Valid options are Yes or No\&. .RE .SH "SEE ALSO" .sp vrfydmn(8) .SH "BUGS" .sp There are no known bugs so far\&. Please submit bugs to https://github\&.com/croessner/vrfydmn/issues\&. .SH "AUTHOR" .sp Christian Roessner wrote the program\&. .sp Patrick Ben Koetter wrote this man page\&. .SH "RESOURCES" .sp vrfydmn\(cqs home is at https://github\&.com/croessner/vrfydmn\&. .SH "COPYING" .sp Copyright (C) 2014\-2015 Christian Roessner\&. Free use of this software is granted under the terms of the GNU General Public License (GPL)\&. vrfydmn-0.11.0/doc/vrfydmn_ldap.5.html000066400000000000000000000546671346027776400176030ustar00rootroot00000000000000 vrfydmn_ldap(5)

SYNOPSIS

vrfydmn -l ldap:///etc/vrfydmn/ldap.cfg

DESCRIPTION

vrfydmn uses lists and tables to lookup mail related informations. A lookup tables may be an LDAP database.

In order to use LDAP lookups, specify a path to a file holding LDAP connection and query configuration. The path must be given when vrfydmn is invoked on command line:

vrfydmn -l ldap:///etc/vrfydmn/ldap.cfg

OPTIONS

base (default: None)

The RFC2253 base DN at which to conduct the search, e.g. 

base = ou=maildomains,dc=example,dc=com
bindmethod (default: None)

The method used when binding to the LDAP server. Valid options are simple or sasl.

cacert (default: None)

Specifies the file that contains certificates for all of the Certificate Authorities the client will recognize. 

cacert = /etc/ssl/certs/cacerts.pem
cert (default: None)

Specifies the file that contains the client certificate. 

cert = /etc/ssl/certs/mail.example.com-crt.pem
filter (default: None)

The RFC2254 filter used to search the directory, e.g. 

filter = (domain=*)
host (default: None)

The name of the host running the LDAP server, e.g. 

host = 127.0.0.1, ldap.example.com
key (default: None)

Specifies the file that contains the private key that matches the certificate stored in the cert file. Currently, the private key must not be protected with a password, so it is of critical importance that the key file is protected carefully. 

key = /etc/ssl/private/mail.example.com-key.pem
reqcert (default: demand)

Specifies what checks to perform on server certificates in a TLS session, if any. The <level> can be specified as one of the following keywords:

never

The client will not request or check any server certificate.

allow

The server certificate is requested. If no certificate is provided, the session proceeds normally. If a bad certificate is provided, it will be ignored and the session proceeds normally.

try

The server certificate is requested. If no certificate is provided, the session proceeds normally. If a bad certificate is provided, the session is immediately terminated.

demand

The server certificate is requested. If no certificate is provided, or a bad certificate is provided, the session is immediately terminated. This is the default setting.

result_attrs (default: None)

The name of the attribute whose value the query should return. 

result_attrs = domain
saslmech (default: None)

The mechanism outgoing’s LDAP client should use, when it sasl-binds to the remote LDAP server. Valid options are currently PLAIN or EXTERNAL.

scope (default: None)

The LDAP search scope: sub, base, or one.

usetls (default: No)

A Boolean option to enable or disable usage of TLS when connecting to the LDAP server. Valid options are Yes or No.

SEE ALSO

vrfydmn(8)

BUGS

There are no known bugs so far. Please submit bugs to https://github.com/croessner/vrfydmn/issues.

AUTHOR

Christian Roessner <c@roessner.co> wrote the program.

Patrick Ben Koetter <p@sys4.de> wrote this man page.

RESOURCES

vrfydmn’s home is at https://github.com/croessner/vrfydmn.

COPYING

Copyright (C) 2014-2015 Christian Roessner. Free use of this software is granted under the terms of the GNU General Public License (GPL).

vrfydmn-0.11.0/doc/vrfydmn_ldap.5.txt000066400000000000000000000072431346027776400174420ustar00rootroot00000000000000vrfydmn_ldap(5) =============== :doctype: manpage :man source: vrfydmn_ldap :man version: 0.4 :man manual: vrfydmn Manual NAME ---- vrfydmn_ldap - lookup RFC5322 From:-addresses in an LDAP database. SYNOPSIS -------- *vrfydmn* -l 'ldap:///etc/vrfydmn/ldap.cfg' DESCRIPTION ----------- vrfydmn uses lists and tables to lookup mail related informations. A lookup tables may be an LDAP database. In order to use LDAP lookups, specify a path to a file holding LDAP connection and query configuration. The path must be given when *vrfydmn* is invoked on command line: *vrfydmn* -l 'ldap:///etc/vrfydmn/ldap.cfg' OPTIONS ------- *base* (default: None):: The RFC2253 base DN at which to conduct the search, e.g. base = ou=maildomains,dc=example,dc=com *bindmethod* (default: None):: The method used when binding to the LDAP server. Valid options are simple or sasl. *cacert* (default: None):: Specifies the file that contains certificates for all of the Certificate Authorities the client will recognize. cacert = /etc/ssl/certs/cacerts.pem *cert* (default: None):: Specifies the file that contains the client certificate. cert = /etc/ssl/certs/mail.example.com-crt.pem *filter* (default: None):: The RFC2254 filter used to search the directory, e.g. filter = (domain=*) *host* (default: None):: The name of the host running the LDAP server, e.g. host = 127.0.0.1, ldap.example.com *key* (default: None):: Specifies the file that contains the private key that matches the certificate stored in the cert file. Currently, the private key must not be protected with a password, so it is of critical importance that the key file is protected carefully. key = /etc/ssl/private/mail.example.com-key.pem *reqcert* (default: *demand*):: Specifies what checks to perform on server certificates in a TLS session, if any. The can be specified as one of the following keywords: *never*;; The client will not request or check any server certificate. *allow*;; The server certificate is requested. If no certificate is provided, the session proceeds normally. If a bad certificate is provided, it will be ignored and the session proceeds normally. *try*;; The server certificate is requested. If no certificate is provided, the session proceeds normally. If a bad certificate is provided, the session is immediately terminated. *demand*;; The server certificate is requested. If no certificate is provided, or a bad certificate is provided, the session is immediately terminated. This is the default setting. *result_attrs* (default: None):: The name of the attribute whose value the query should return. result_attrs = domain *saslmech* (default: None):: The mechanism outgoing's LDAP client should use, when it sasl-binds to the remote LDAP server. Valid options are currently PLAIN or EXTERNAL. *scope* (default: None):: The LDAP search scope: sub, base, or one. *usetls* (default: No):: A Boolean option to enable or disable usage of TLS when connecting to the LDAP server. Valid options are Yes or No. SEE ALSO -------- vrfydmn(8) BUGS ---- There are no known bugs so far. Please submit bugs to . AUTHOR ------ Christian Roessner wrote the program. Patrick Ben Koetter wrote this man page. RESOURCES --------- vrfydmn's home is at . COPYING ------- Copyright \(C) 2014-2015 Christian Roessner. Free use of this software is granted under the terms of the GNU General Public License (GPL). // vim: set ft=asciidoc: vrfydmn-0.11.0/vrfydmn000077500000000000000000001073531346027776400147220ustar00rootroot00000000000000#!/usr/bin/python3 """ vrfdmn - a milter service for postfix Copyright (C) 2019 R.N.S. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . """ import sys import os import pwd import grp import signal import Milter import threading import traceback import argparse import syslog as _syslog try: # noinspection PyUnresolvedReferences import ldap # noinspection PyUnresolvedReferences import ldap.sasl # noinspection PyUnresolvedReferences from ldap.ldapobject import ReconnectLDAPObject except ImportError: no_module_ldap = True else: no_module_ldap = False try: # noinspection PyUnresolvedReferences,PyPep8Naming import MySQLdb as mdb except ImportError: no_module_sql = True else: no_module_sql = False try: # noinspection PyUnresolvedReferences import memcache except ImportError: no_module_memcache = True else: no_module_memcache = False try: # noinspection PyUnresolvedReferences import setproctitle setproctitle.setproctitle("vrfydmn") except ImportError: pass from syslog import * from syslog import syslog as syslog from getopt import getopt from email.header import decode_header from email.utils import parseaddr from threading import Thread from queue import Queue NAME = "vrfydmn" # Defaults BINDADDR = "[::1]" PORT = 30072 MILTERUSER = "milter" MILTERGROUP = "milter" LDAP_TIMEOUT = 60 MAX_SQL_CONNECT_RETRIES = 3 VERSION = "0.11.0" __version__ = VERSION __author__ = "Christian Roessner " __copyright__ = "Copyright (C) 2011 R.N.S." # noinspection PyUnresolvedReferences class Cfg(object): """Helper class for some configuration parameters""" action = Milter.REJECT hold = False workerQueue = Queue() ldap_con = None sql_con = None memcached_con = None # noinspection PyIncorrectDocstring,PyUnresolvedReferences class VrfyDmnMilter(Milter.Base): """ Milter that comares the domain component of an email address read from the From:-header and compares it to a list of Postfix domains. If a match is found, mail is allowed to pass, else the mail is rejected. """ def __init__(self): self.__id = Milter.uniqueID() self.__ipname = None self.__ip = None self.__port = None self.__reject = False self.__dryrun_reject = False self.__email = "" self.__mail_from = "" self.__original_from = "" self.__add_header = True self.__has_sender = False self.__header = None # noinspection PyUnusedLocal @Milter.noreply def connect(self, ipname, family, hostaddr): """connect callback """ self.__ip = hostaddr[0] self.__ipname = ipname self.__port = hostaddr[1] if config.debug: print("id=%i connect from %s[%s]:%s" % (self.__id, self.__ipname, self.__ip, self.__port)) return Milter.CONTINUE # noinspection PyUnusedLocal @Milter.noreply def envfrom(self, mailfrom, *dummy): """Callback that is called when MAIL FROM: is recognized. This also is the most earliest time, where we can collect nearly all connection specific information. """ self.__mail_from = parseaddr(mailfrom)[1] self.__header = dict() return Milter.CONTINUE @Milter.noreply def header(self, name, hval): """header callback gets called for each header """ if config.debug: print("%s: %s" % (name, hval)) if name.lower() == "from": self.__original_from = hval self.__header[name.lower()] = hval # Mailinglists... if name.lower() == "sender": self.__header[name.lower()] = hval if name.lower() == "reply-to": self.__add_header = False return Milter.CONTINUE def eoh(self): """eoh - end of header. Gets called after all headers have been proccessed""" # We must check for a Sender header field if "sender" in self.__header: hval = "sender" else: hval = "from" # Extract email from most right tuple decoded_from = decode_header(self.__header[hval])[-1] # Try to find the email address and to cut off garbage decoded_from_parts = decoded_from[0].split() email = "" for component in iter(decoded_from_parts): # NOTE: Asume the last occurence of an "@" represents the # email address. # NOTE: RFC5322 allows a mailbox-list for the From field! # Currently this fact is ignored! if "@" in component: email = component email = parseaddr(email)[1] self.__email = email # From: <> found, skip this mail if email == "": if config.debug: print("id=%i %s return_value=skip" % (self.__id, self.getsymval('i'))) syslog(LOG_INFO, "%s: return_value=skip" % self.getsymval('i')) return Milter.CONTINUE # Cut local part from email _from_domain = email.split("@") if len(_from_domain) == 1: if config.debug: print("id=%i %s unhandled=<%s> return_value=skip" % (self.__id, self.getsymval('i'), email)) syslog(LOG_INFO, "%s: unhandled=<%s> return_value=skip" % ( self.getsymval('i'), email)) return Milter.CONTINUE else: from_domain = _from_domain[1] # Remember, if a domain was found found = False if config.fix: self.__dryrun_reject = True elif config.opposite: self.__reject = False else: self.__reject = True if config.ldap: response = Queue() Cfg.workerQueue.put((response, Cfg.ldap_con.query_ldap, # func (from_domain if not config.email else email,))) # *args result = response.get() if result is True or result is None: found = True if config.fix: self.__dryrun_reject = False elif config.opposite: self.__reject = True else: self.__reject = False if not found and config.sql: response = Queue() Cfg.workerQueue.put((response, Cfg.sql_con.query_sql, # func (from_domain if not config.email else email,))) # *args result = response.get() if result is True or result is None: found = True if config.fix: self.__dryrun_reject = False elif config.opposite: self.__reject = True else: self.__reject = False if not found and config.file: if PfDomains.domains: # Honor sub domains for key_domain in iter(PfDomains.domains): if key_domain in from_domain: if config.fix: self.__dryrun_reject = False elif config.opposite: self.__reject = True else: self.__reject = False break result = "continue" if self.__reject: if Cfg.action == Milter.CONTINUE: if Cfg.hold: result = "quarantine" else: result = "continue" elif Cfg.action == Milter.REJECT: result = "reject" if config.debug: print("id=%i %s header_from=<%s> mail_from=<%s> return_value=%s" % (self.__id, self.getsymval('i'), email, self.__mail_from, result)) syslog(LOG_INFO, "%s: header_from=<%s> mail_from=<%s> return_value=%s" % (self.getsymval('i'), email, self.__mail_from, result)) if self.__reject: if Cfg.action == Milter.REJECT: self.setreply("554", xcode="5.7.0", msg="Reject Queue-ID: %s - " "RFC5322 from address: <%s>" % (self.getsymval('i'), self.__email)) return Milter.REJECT return Milter.CONTINUE def eom(self): """eom - end of message. If --fix was given at the command line, we replace the broken From:-header with the MAIL FROM value""" if self.__reject and Cfg.hold: self.quarantine("%s: header_from=<%s> mail_from=<%s>" % (self.getsymval("i"), self.__email, self.__mail_from)) if self.__dryrun_reject and \ self.__email != self.__mail_from: self.chgheader("From", 0, "<%s>" % self.__mail_from) if config.debug: print("id=%i %s header_from=<%s> mail_from=<%s>" % (self.__id, self.getsymval('i'), self.__email, self.__mail_from)) syslog(LOG_INFO, "%s: header_from=<%s> mail_from=<%s>" % (self.getsymval('i'), self.__email, self.__mail_from)) if self.__add_header: self.addheader("Reply-To", self.__original_from) decoded_from = decode_header(self.__original_from) new_from = " ".join([s for s, _ in decoded_from]) if config.debug: print("id=%i %s reply_to: %s" % (self.__id, self.getsymval('i'), new_from)) syslog(LOG_INFO, "%s: reply_to: %s" % (self.getsymval('i'), new_from)) return Milter.CONTINUE def close(self): """close callback""" if config.debug: print("id=%i disconnect from %s[%s]:%s" % (self.__id, self.__ipname, self.__ip, self.__port)) return Milter.CONTINUE # noinspection PyMethodParameters,PyShadowingNames class MetaPfDomains(type): """ PfDomains is a central store for all postfix domains that the milter recognizes as trusted domains """ _domains = list() __lock = threading.Lock() def _set_postfix_domains(meta, pf_file): generated_list = list() try: with open(pf_file) as fd: while True: raw_line = fd.readline() if raw_line == "": break line = raw_line.strip() # Skip comments and empty lines if line.startswith("#"): continue if line == "": continue key_domain = line.split()[0] generated_list.append(key_domain) # Make operation thread safe with MetaPfDomains.__lock: meta._domains = generated_list except OSError as e: # Unable to read Postfix domains! if config.debug: print('Unable to read %s: %s' % (pf_file, e), file=sys.stderr) syslog(LOG_ERR, 'Unable to read %s: %s' % (pf_file, e)) def _get_postfix_domains(meta): return meta._domains domains = property(_get_postfix_domains, _set_postfix_domains) class PfDomains(object): """We use a meta class, as the "domains" variable shall not be world readable and writeable. This is a class with classmethods and properties """ __metaclass__ = MetaPfDomains # noinspection PyShadowingNames class Domains(object): """ Base mixin class for all kinds of lists of domains. Each database driver must derive from this base class. The constructor requires at least a configuration file, which is directly parsed and evaluated. The result is a dictionary that is stored internally. Each driver itself knows how to deal with the values found. As the base class implements an iterator and a representation method, the values being processed by each driver are returned as a list of domains. We do not keep database connections open, as a list of domains normally does not float too often. Additionally the amount of domains will never be too large, so we can read all data at once and keep it in memory. """ def __init__(self, cffile): self._filecontent = {} self._cf_read_err = False try: with open(cffile, "r") as fd: while True: line = fd.readline() if line == "": break if line.lstrip().startswith("#"): continue if line.strip() == "": continue if line.count('=') >= 1: idx = line.find('=') k = line[0:idx].strip().lower() v = line[idx+1:].strip() else: k = line.strip().lower() v = [] if k != "": self._filecontent[k] = v except Exception as e: # Unable to read config file if config.debug: print('Unable to read %s: %s' % (cffile, e), file=sys.stderr) syslog(LOG_ERR, 'Unable to read %s: %s' % (cffile, e)) self._cf_read_err = True # noinspection PyShadowingNames class LDAPDomains(Domains): """ The LDAPDomains driver connects to a list of LDAP servers. It supports simple and SASL authentication, as well as TLS connections. """ def __init__(self, cffile): Domains.__init__(self, cffile) self.__con = None if self._cf_read_err: return self.__host = ["ldap://127.0.0.1/"] self.__base = "" self.__bindmethod = "simple" self.__binddn = None self.__bindpw = None self.__saslmech = None self.__authz_id = "" self.__filter = "(objectClass=*)" self.__result_attrs = [] self.__scope = "sub" self.__usetls = "no" self.__cipher = "TLSv1" self.__reqcert = "never" self.__cert = None self.__key = None self.__cacert = None for k, v in self._filecontent.items(): if k == "host": self.__host = v.split(',') for idx, server in enumerate(self.__host): self.__host[idx] = server.strip() elif k == "base": self.__base = v elif k == "bindmethod": self.__bindmethod = v elif k == "binddn": self.__binddn = v elif k == "bindpw": self.__bindpw = v elif k == "saslmech": self.__saslmech = v elif k == "authzid": self.__authz_id = v elif k == "filter": self.__filter = v elif k == "result_attrs": self.__result_attrs = v.split(',') for idx, attr in enumerate(self.__result_attrs): self.__result_attrs[idx] = attr.strip() elif k == "scope": self.__scope = v elif k == "usetls": self.__usetls = v elif k == "cipher": self.__cipher = v elif k == "reqcert": self.__reqcert = v elif k == "cert": self.__cert = v elif k == "key": self.__key = v elif k == "cacert": self.__cacert = v else: raise Exception("Unsupported parameter %s: %s" % (k, v)) tls = False sasl = False # Do we connect with TLS? reqcert = None if self.__usetls.lower() in ("yes", "true", "1"): if self.__reqcert in ("never", "allow", "try", "demand"): if self.__reqcert == "never": reqcert = ldap.OPT_X_TLS_NEVER elif self.__reqcert == "allow": reqcert = ldap.OPT_X_TLS_ALLOW elif self.__reqcert == "try": reqcert = ldap.OPT_X_TLS_TRY elif self.__reqcert == "demand": reqcert = ldap.OPT_X_TLS_DEMAND else: raise Exception("Unsupported TLS reqcert Option %s" % self.__reqcert) ldap.set_option(ldap.OPT_X_TLS_REQUIRE_CERT, reqcert) ldap.set_option(ldap.OPT_X_TLS_CIPHER_SUITE, self.__cipher) if self.__cacert is not None: ldap.set_option(ldap.OPT_X_TLS_CACERTFILE, self.__cacert) if self.__cert is not None: ldap.set_option(ldap.OPT_X_TLS_CERTFILE, self.__cert) if self.__key is not None: ldap.set_option(ldap.OPT_X_TLS_KEYFILE, self.__key) tls = True # Are we SASL binding to our servers? auth_tokens = None if self.__bindmethod == "sasl": if self.__saslmech.lower() == "digest-md5": auth_tokens = ldap.sasl.digest_md5(self.__binddn, self.__bindpw) elif self.__saslmech.lower() == "cram-md5": auth_tokens = ldap.sasl.cram_md5(self.__binddn, self.__bindpw) elif self.__saslmech.lower() == "external": auth_tokens = ldap.sasl.external(self.__authz_id) elif self.__saslmech.lower() == "gssapi": auth_tokens = ldap.sasl.gssapi(self.__authz_id) else: raise Exception("Unsupported SASL mech %s" % self.__saslmech) sasl = True con = None for server in iter(self.__host): try: con = ReconnectLDAPObject(server, retry_max=1000000) if tls: con.start_tls_s() if sasl: con.sasl_interactive_bind_s("", auth_tokens) else: con.simple_bind_s(self.__binddn, self.__bindpw) except Exception as ldap_err: if config.debug: print("Some LDAP error happened: {0}".format(ldap_err)) traceback.print_exc() continue break self.__con = con # This method is synchronized with Queue() def query_ldap(self, from_domain): if self.__con is None: return if config.memcached: result = Cfg.memcached_con.get(from_domain) if result is not None: result = bool(result) if result: text = "continue" else: text = "reject" if config.debug: print("cached_result: %s=%s" % (from_domain, text)) syslog(LOG_INFO, "cached_result: %s=%s" % (from_domain, text)) return result if self.__scope in ("sub", "subtree"): scope = ldap.SCOPE_SUBTREE elif self.__scope in ("one", "onelevel"): scope = ldap.SCOPE_ONELEVEL elif self.__scope in ("base", "exact"): scope = ldap.SCOPE_BASE else: raise Exception("Unsupported LDAP scope %s" % self.__scope) ldap_filter = "" if "%s" in self.__filter.lower(): filter_parts = self.__filter.split("%s") ldap_filter = from_domain.join(filter_parts) if config.debug: print("====> LDAP-filter: %s" % ldap_filter) result = self.__con.search_st(self.__base, scope, ldap_filter, self.__result_attrs, timeout=LDAP_TIMEOUT) # Temporarily store the result tmp_lst = list() # result - list of tuples for row in iter(result): for res_attrs in row[1].values()[0]: tmp_lst.append(res_attrs) if config.debug: print("----> res_attrs = %s" % res_attrs) if tmp_lst: if config.memcached: Cfg.memcached_con.set(from_domain, True, time=3600) return True else: if config.memcached: Cfg.memcached_con.set(from_domain, False, time=60) return False # noinspection PyShadowingNames class SQLDomains(Domains): """SQL class. Currently only MySQL ist supported """ def __init__(self, cffile): Domains.__init__(self, cffile) self.__con = None if self._cf_read_err: return self.__host = "localhost" self.__dbname = None self.__dbuser = None self.__dbpass = None self.__query = None for k, v in self._filecontent.items(): if k == "host": self.__host = v elif k == "port": self.__port = int(v) elif k == "dbuser": self.__dbuser = v elif k == "dbpass": self.__dbpass = v elif k == "dbname": self.__dbname = v elif k == "query": self.__query = v # Initially connect, retry on errors; see below self.connect() def connect(self): con = None try: con = mdb.connect(self.__host, self.__dbuser, self.__dbpass, self.__dbname) except Exception as m_err: if config.debug: print("Some MySQL/MariaDB error happened: {0}".format(m_err)) traceback.print_exc() self.__con = con def query_sql(self, from_domain): if self.__con is None: return None if self.__query is None: return None if config.memcached: result = Cfg.memcached_con.get(from_domain) if result is not None: result = bool(result) if result: text = "continue" else: text = "reject" if config.debug: print("cached_result: %s=%s" % (from_domain, text)) syslog(LOG_INFO, "cached_result: %s=%s" % (from_domain, text)) return result for retries in xrange(MAX_SQL_CONNECT_RETRIES): try: cur = self.__con.cursor() cur.execute(self.__query % from_domain) break except Exception as e: if e[0] == 2006: # Lost connection, try reconnect syslog(LOG_ERR, "SQL connection lost ({}/{}): code={} msg={}".format( retries+1, MAX_SQL_CONNECT_RETRIES, e[0], e[1])) self.connect() else: syslog(LOG_ERR, "SQL error: %s" % str(e)) return None else: return None domains = cur.fetchall() if config.debug: print("SQL result for %s: %s" % (from_domain, str(domains))) # Domain was found on SQL server, count > 0 if len(domains) > 0: if config.memcached: Cfg.memcached_con.set(from_domain, True, time=3600) return True # ... not found else: if config.memcached: Cfg.memcached_con.set(from_domain, False, time=3600) return False # noinspection PyUnresolvedReferences def runner(): """Starts the milter loop""" Milter.factory = VrfyDmnMilter flags = Milter.CHGHDRS + Milter.ADDHDRS + Milter.QUARANTINE Milter.set_flags(flags) Milter.runmilter(NAME, config.socket, timeout=300) # noinspection PyShadowingNames def db_runner(): """Implements a bi-directional queue that allows all milter threads to communicate with one single thread that does all DB operations. """ db_running = False if config.memcached: Cfg.memcached_con = memcache.Client([config.memcached], debug=0) if config.ldap: Cfg.ldap_con = LDAPDomains(config.ldap) if Cfg.ldap_con is not None: db_running = True if config.sql: Cfg.sql_con = SQLDomains(config.sql) if Cfg.sql_con is not None: db_running = True if db_running: while True: req = Cfg.workerQueue.get() if not req: # Nothing more to process; skip continue # Queue, func, *args response, func, args = req try: result = func(*args) except Exception as gen_err: print("Oops! Some error happened: {0}".format(gen_err)) traceback.print_exc() result = None response.put(result) # noinspection PyProtectedMember,PyUnresolvedReferences if __name__ == "__main__": parser = argparse.ArgumentParser(epilog="vrfydmn - verify domain milter") parser.add_argument("--socket", "-s", type=str, default="inet6:{0}@{1}".format(PORT, BINDADDR), help="IPv4, IPv6 or unix socket (default: %(default)s)") parser.add_argument("--syslog_name", "-n", type=str, default=NAME, help="Syslog name (default: %(default)s)") parser.add_argument("--syslog_facility", "-N", type=str, default="mail", help="Syslog facility (default: %(default)s)") parser.add_argument("--user", "-u", type=str, default=MILTERUSER, help="Run milter as this user (default: %(default)s)") parser.add_argument("--group", "-g", type=str, default=MILTERGROUP, help="Run milter with this group " "(default: %(default)s)") parser.add_argument("--pid", "-p", type=str, default=None, help="Path for an optional PID file") parser.add_argument("--debug", "-d", default=False, action="store_true", help="Run in foreground with debugging turned on") parser.add_argument("--file", "-f", type=str, default=None, help="Postfix domains map file") parser.add_argument("--ldap", "-l", type=str, default=None, help="Config file for a LDAP connection") parser.add_argument("--sql", "-S", type=str, default=None, help="Config file for a SQL connection (Currently " "MySQL only)") parser.add_argument("--memcached", "-m", type=str, default=None, help="Memcache socket") parser.add_argument("--fix", "-F", default=False, action="store_true", help="Replace broken From:-header with envelope sender") parser.add_argument("--opposite", "-O", default=False, action="store_true", help="Reject mail, if a sender uses our domain") parser.add_argument("--action", "-a", default="reject", choices=["accept", "reject", "quarantine"], help="If test fails: accept, reject or quarantine. " "The --fix option implies 'accept' " "(default: %(default)s)") parser.add_argument("--email", "-e", default=False, action="store_true", help="Use email as search key, not only the domain") config = parser.parse_args() if config.file: if not os.path.exists(config.file): print('No such file: %s' % config.file, file=sys.stderr) sys.exit(os.EX_USAGE) # Read list of domains PfDomains.domains = config.file if config.ldap: if no_module_ldap: config.ldap = None print("Missing python module ldap!", file=sys.stderr) if config.sql: if no_module_sql: config.sql = None print("Missing python module for SQL!", file=sys.stderr) if not (config.file or config.ldap or config.sql): print("You must specify at least one of --file, --ldap or --sql", file=sys.stderr) sys.exit(1) if config.memcached: if no_module_memcache: config.memcached = None print("Missing python module memcache!", file=sys.stderr) if config.action: if config.action == "accept": Cfg.action = Milter.CONTINUE elif config.action == "reject": Cfg.action = Milter.REJECT elif config.action == "quarantine": Cfg.action = Milter.CONTINUE Cfg.hold = True if config.fix and config.opposite: print("Do not use --fix and --opposite together", file=sys.stderr) sys.exit(os.EX_USAGE) if config.fix: Cfg.action = Milter.CONTINUE Cfg.hold = False facility_name = "LOG_" + config.syslog_facility.upper() if config.debug: print("Log facility_name: {}".format(facility_name)) facility = getattr(_syslog, facility_name, LOG_MAIL) if config.debug: print("Log facility: {}".format(facility)) openlog(config.syslog_name, LOG_PID, facility) try: uid = pwd.getpwnam(config.user)[2] gid = grp.getgrnam(config.group)[2] except KeyError as e: print("User or group not known: {0}".format(e.message), file=sys.stderr) sys.exit(1) try: # Needs Python >=2.7 os.initgroups(config.user, gid) except Exception as _: pass try: os.setgid(gid) except OSError as e: print('Could not set effective group id: %s' % e, file=sys.stderr) sys.exit(1) try: os.setuid(uid) except OSError as e: print('Could not set effective user id: %s' % e, file=sys.stderr) sys.exit(1) if config.debug: print("Switched user to %s, group to %s" % (uid, gid)) print("Staying in foreground...") else: try: pid = os.fork() except OSError as e: print("First fork failed: (%d) %s" % (e.errno, e.strerror), file=sys.stderr) sys.exit(1) if pid == 0: os.setsid() try: pid = os.fork() except OSError as e: print("Second fork failed: (%d) %s" % (e.errno, e.strerror), file=sys.stderr) sys.exit(1) if pid == 0: os.chdir("/") os.umask(0) else: # noinspection PyProtectedMember os._exit(0) else: # noinspection PyProtectedMember os._exit(0) # In daemon mode, we redirect stdin, stdout and stderr to /dev/null sys.stdin = open(os.devnull, "r").fileno() sys.stdout = open(os.devnull, "w").fileno() sys.stderr = open(os.devnull, "w").fileno() try: if config.pid: with open(config.pid, "w") as fd: fd.write(str(os.getpid())) except IOError as e: if config.debug: print("Cannot create PID file: (%d) %s" % (e.errno, e.strerror), file=sys.stderr) def finish(signum, frame): _ = frame syslog(LOG_NOTICE, "%s-%s milter shutdown. Caught signal %d" % (NAME, VERSION, signum)) def reload_postfix_domains(signum, frame): _ = frame if config.debug: print("%s-%s milter reload Postfix domains. Caught signal %d" % (NAME, VERSION, signum)) syslog(LOG_NOTICE, "%s-%s milter reload Postfix domains. Caught signal %d" % (NAME, VERSION, signum)) if config.file: PfDomains.domains = config.file # Go back to sleep signal.pause() def print_postfix_domains(signum, frame): _ = signum, frame if config.file: # noinspection PyTypeChecker all_domains = ", ".join(PfDomains.domains) # max syslog line length offset = 1536 str_sgmts = [] max_len = len(all_domains) d = "..." for i in xrange(0, max_len, offset): if i == 0: str_sgmts.append(all_domains[i:i+offset].strip() + d) if i > 0 and i+offset < max_len: str_sgmts.append(d + all_domains[i:i+offset].strip() + d) if i > 0 and i+offset >= max_len: str_sgmts.append(d + all_domains[i:i+offset].strip()) for part in iter(str_sgmts): if config.debug: print("%s-%s milter Postfix domains: [%s]" % (NAME, VERSION, part)) syslog(LOG_NOTICE, "%s-%s milter Postfix domains: [%s]" % (NAME, VERSION, part)) # Go back to sleep signal.pause() signal.signal(signal.SIGINT, finish) signal.signal(signal.SIGQUIT, finish) signal.signal(signal.SIGTERM, finish) signal.signal(signal.SIGHUP, reload_postfix_domains) signal.signal(signal.SIGUSR1, print_postfix_domains) signal.siginterrupt(signal.SIGHUP, False) signal.siginterrupt(signal.SIGUSR1, False) syslog(LOG_NOTICE, "%s-%s milter startup" % (NAME, VERSION)) milter_t = Thread(target=runner) milter_t.daemon = True milter_t.start() # Worker thread for all kinds of databases db_runner_t = Thread(target=db_runner) db_runner_t.daemon = True db_runner_t.start() # Waiting for SIGNAL to terminate process signal.pause() try: if config.pid and os.path.exists(config.pid): os.unlink(config.pid) except IOError as e: if config.debug: print("Cannot remove PID file: (%d) %s" % (e.errno, e.strerror), file=sys.stderr) sys.exit(1) sys.exit(0) # vim: expandtab ts=4 sw=4 vrfydmn-0.11.0/vrfydmn-generate-report.sh000077500000000000000000000013461346027776400204270ustar00rootroot00000000000000#!/bin/bash #set -x export PATH="/bin:/sbin:/usr/bin:/usr/sbin" MAILFROM="postmaster@example.com" DISPLAYNAME="Postmaster" RCPTTO="operator@yoursite.tld" #------------- CONFIG=${1:-"/etc/postfix"} QUEUE=$(postconf -h -c $CONFIG queue_directory) TIMESTAMP=$(date +"%Y-%m-%d - %H:%M") queue_empty() { if [[ -z "$(find $QUEUE/hold -type f)" ]]; then return 0 else return 1 fi } send_report() { if ! queue_empty; then ( echo "Envelope-sender address:" echo "------------------------" postqueue -c $CONFIG -p \ | awk '/^[a-zA-Z0-9]+\!/ { print $NF; }' \ | sort \ | uniq ) | mail -s "Postfix $CONFIG hold queue ($TIMESTAMP)" $RCPTTO \ -- -f $MAILFROM -F $DISPLAYNAME fi } send_report exit 0 # vim: ts=4 sw=4 vrfydmn-0.11.0/vrfydmn.init000077500000000000000000000024371346027776400156610ustar00rootroot00000000000000#! /bin/bash ### BEGIN INIT INFO # Provides: vrfydmn # Required-Start: $remote_fs $syslog # Required-Stop: $remote_fs $syslog # Should-Start: $local_fs # Should-Stop: $local_fs # Default-Start: 2 3 4 5 # Default-Stop: 0 1 6 # Short-Description: Start vrfydmn daemon # Description: Start up vrfydmn, a anti-spoofing milter for Postfix ### END INIT INFO . /lib/lsb/init-functions NAME=vrfydmn COMMAND="/usr/local/sbin/${NAME}" PIDFILE="/var/run/vrfydmn/vrfydmn.pid" start_daemon() { mkdir -p /var/run/${NAME} chown milter:milter /var/run/${NAME} echo "Starting ${NAME}" start-stop-daemon --start --pidfile "${PIDFILE}" \ --exec ${COMMAND} -- -p "${PIDFILE}" -f /etc/postfix/relay_domains return $? } stop_daemon() { echo "Stopping ${NAME}" killproc -p ${PIDFILE} ${COMMAND} return $? } case "$1" in start) start_daemon exit $? ;; stop) stop_daemon exit $? ;; restart) $0 stop && $0 start ;; reload) echo "${NAME}: Reloading Postfix domain maps" kill -SIGHUP $(cat ${PIDFILE}) ;; status) status_of_proc -p ${PIDFILE} vrfydmn vrfydmn && exit 0 || exit $? ;; *) echo "Usage: ${NAME} {start|stop|restart|reload|status}" >&2 ;; esac exit 0 vrfydmn-0.11.0/vrfydmn.openrc000077500000000000000000000013361346027776400162010ustar00rootroot00000000000000#!/sbin/runscript # Copyright 1999-2013 Gentoo Foundation # Distributed under the terms of the GNU General Public License v2 # $Header: $ command="/usr/local/sbin/vrfydmn" PIDDIR="/run/${SVCNAME}" PIDFILE="${PIDDIR}/${SVCNAME}.pid" depend() { use mta logger net } start() { if [ ! -d "${PIDDIR}" ] ; then checkpath -q -d -o milter:milter -m 0755 "${PIDDIR}" || return 1 fi ebegin "Starting ${SVCNAME}" start-stop-daemon --start --pidfile "${PIDFILE}" \ --exec ${command} -- -p "${PIDFILE}" ${OPTIONS} eend $? } stop() { ebegin "Stopping ${SVCNAME}" start-stop-daemon --stop --pidfile "${PIDFILE}" \ --retry 30 \ --exec ${command} eend $? }