This note concerns the DKIM patch embedded in my combined patch. This topic is advanced and you can skip it at the beginning. Info: -. Author: Manvendra Bhangui. Patch's version: 1.26. Download: from -DKIM provides a method for validating a domain name identity that is associated with a message through cryptographic authentication. The validation technique is based on public-key cryptography: Responsibility is claimed by the signer by adding a domain name to the message and then also affixing a digital signature of it and the message.

The value is placed in the DKIM-Signature: header field. The verifier recovers the signer's public key using the DNS, and then verifies the signature.You are invited to take a look to the man pages starting from dkim(8) and spawn-filter(8).Mirko Buffoni did a slight modification which allows to sign messages sent by authenticated users, and to verify all non authenticated ones. Changelog. 2019.12.08- the script now can sign both 2048 and 1024 bit (thanks ). 2019.06.19- DKIM patch updated to v. 1.26. BUG - honor body length tag in verification.

2019.05.23- SIGSEGV - when the txt data for domainkeys is very large exposed a bug in the way realloc was used incorrectly.- On 32 bit systems, variable defined as timet overflows. Now qmail-dkim will skip expiry check in such conditions. 2019.04-27- added a note concerning the signing with a 2048 long key. 2019.02.27patch updated to v. 1.24. bug fix: restored signaturedomains/nosignaturedomains functionalities.

Gentoo Qmail Dns Patch 1

2018.08.25-patch updated to v. 1.23. fixed a bug where including round brackets in the From: field ouside the double quotes (From: 'Name Surname (My Company)' ) results in a DKIMContext structure invalid error (tx Mirko Buffoni).

qmail-dkim and dkim were issuing a failure for emails which had multiple signature with at least one good signature. Now qmail-dkim and dkim will issue a success if at least one good signature is found. 2018-04-03-patch updated to v. 1.22. openssl 1.1.0 port.

various improvements, bug fixes. 2017-05-14-patch updated to v. 1.20It now manages long TXT records, avoiding the rejection of some hotmail.com messages.

2016-03-09Upgraded to v. 1.19: verification will not fail when a dkim signature does not include the subject provided that the UNSIGNEDSUBJECT environment variable is declared. More infoAcknowlegmentsI would like to address a special thank to, the author of the, for kindly assisting me during all the configuration.I will show how to configure qmail-remote to sign your outgoing messages and qmail-smtpd to verify your incoming messages. Eventually, as an alternative, you can decide to set qmail-smtpd to do both things; this configuration is presented towards the bottom of this page.In any case you have to create the domainkey signature.

Creating the domainkey signature for your outgoing emailsSignatures are created using a private key on your system, and verified by a public key stored in the DNS for the email domain.Before you can sign an email, you must create at least one public/private key pair. You may want to create key pairs for every domain you wish to sign, or use one single signature for all your hosted domains.First of all the script (thanks to Joerg Backschues and to for the 2048 bit key support) which we'll use to create the keys and print the DNS record. Cd /usr/local/binwget +x domainkeyNow create the folder which will store all the domainkeys. Mkdir /usr/local/etc/domainkeys Usage Usage: /usr/local/bin/domainkey -p domain selectorCreate domainkeyPrint domainkey with -pThe script can create the key or print the existing key if used with the -p option.When you create a key for a domain.net it will be stored in the /usr/local/etc/domainkeys/domain.net folder. The folder will be owned by qmailr (the user running qmail-remote) if you sign at qmail-remote level or vpopmail, which is the user who runs qmail-smtpd, if you decide to sign at qmail-smtpd level.

My script changes the owner to qmailr by default domainkey domain.netGenerating RSA private key, 1024 bit long modulus.e is 65537 (0x10001)writing RSA keyTXT record for BIND:default.domainkey.domain.net. IN TXT 'v=DKIM1; k=rsa; t=y; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCyzJujXz9EiMat2eDzzLjWuSJ6g4i20FXGluNOmruuCFnVJP1OxurKdt57JZm+6QP2h9IOP0owBMmecXI9qx3CkFrlGSMbJsOEGqXwiTSSttgGmSTPZeNAureyo79spwPc44Ol2ZK2U9gBoDpSQEQdLdtXUreRvs/HyTkzalue2wIDAQAB'You have to create a TXT record like that in your DNS server. If your Name Server is not, is your friend.If RELAYCLIENT is defined and both DKIMSIGN and DKIMVERIFY are not defined then qmail-dkim looks for DKIMKEY for the private key to sign. If DKIMKEY is not defined, then control/domainkeys/%/default is used.If RELAYCLIENT is not defined, then qmail-dkim uses DKIMSIGN for the key. If RELAYCLIENT is not defined and both DKIMSIGN and DKIMVERIFY is defined, then qmail-dkim ignores DKIMVERIFY.If the key has% in the filename, then it is replaced with the domain name from the From/Sender header. After substituting%, if the private key is not found, the qmail-dkim removes the% and again checks for the key.

Strace shows this access('control/domainkeys/mydomain.org/default', FOK) = -1 ENOENT (No such file or directory)open('control/domainkeys/default', ORDONLY ONONBLOCK) = 5.If the key has% in the filename and the private key does not exists, then qmail-dkim exits without signing and without any failure. Hence messages will pass through. The reason for this behaviour is i have many clients who run multiple domains on a server and they need DKIM only for few domains.If the key does not have% sign and the private key does not exist, then qmail-dkim exits with 32 resulting in permanent failure 'Private key file does not exist (#5.3.5)'.If none of the variables RELAYCLIENT, DKIMSIGN, DKIMVERIFY are defined, qmail-dkim does verification. Hello,I've noticed that when chaining dkim with simscan the pid of the process changes in simscan. I don't get it: dk-filter states: 'dk-filter uses the domain found in the Sender: header to set the domain tag. If not it uses the From: header.'

But when I test it and also when reading its code, I find no evidence that the From: header would ever be considered. Thus, bounce messages do not get signed, which according to my understanding of they should for a correct DMARC alignment.In fact, when SENDER is empty, dk-filter seems to use /var/qmail/control/domainkeys/default if present. However, this also does not work as intended, because 'd=' has en empty value then, and forwarded bounce messages from foreign domains will also get signed, which is obviously not desirable.Am I holding it wrong, or is the documentation / code just incorrect?RegardsMartin. I see what you meant by the following'I don't get it: dk-filter states: 'dk-filter uses the domain found in the Sender: header to set the domain tag. If not it uses the From: header.' But when I test it and also when reading its code, I find no evidence that the From: header would ever be considered.

Gentoo Qmail Dns Patch Download

Thus, bounce messages do not get signed, which according to my understanding of they should for a correct DMARC alignment.' For bounce messages, since the from/sender will be null, you can set the DKIMDOMAIN environment variable in the script which starts up qmail-send.

DKIMDOMAIN also overrides anyting in the From: or Sender: header. Dk-filter uses SENDER, RECIPIENT env variable which is set by spawn-filter.

Spawn-filter is a program that gets called by qmail-lspawn when QMAILLOCAL is set to /var/qmail/bin/spawn-filter for local deliveries. It also gets called by qmail-rspawn for remote deliveries when you set QMAILREMOTE env variable to /var/qmail/bin/spawn-filter. The spawn-filter than gathers all information like the sender and recipient. It then calls whatever program is defined by FILTERARGS env variable. The input to FILTERARGS is the original email and the output of the FILTERARGS is fed to qmail-local for local deliveries and qmail-remote for remote deliveries. The real workhorse for DKIM verfication and signing is not the dk-filter program. It is actually the binary /var/qmail/bin/dkim which does the actual work using the libdkim library.Check out the man pages for spawn-filter, dkim, dk-filter, qmail-lspawn, qmail-rspawn to know more.

My documenation may not be good and could use some help there (especially things that you find it wrong or do not understand).If you set DKIMVERIFY env variable for qmail-send, then dk-filter will not do signing. Hence bounce messages will not get signed. But one can do the following - do DKIM verification for local deliveries and DKIM Signing for remote deliveries by having two entires in /var/qmail/control/filterargs.:remote:env DKIMSIGN=/var/qmail/control/domainkeys/%/default /var/qmail/bin/dk-filter.:local:env DKIMVERIFY=1 /var/qmail/bin/dk-filterIn my setup, I do DKIM verification during the SMTP transaction and DKIM signing during remote deliveries.Maybe you could describle what you want to achieve with examples and I could work out a solution which will work for you. Hi Mandreva,thanks for your answers!What I am trying to achieve is that all outgoing e-mail which has our domain in its RFC5322.From address (and thus a corresponding /var/qmail/control/domainkeys/$domain/default key file exists) gets a DKIM signature, whereas other messages (e.g. Those which came from remote and get forwarded to other remote addresses) are left untouched.In /var/qmail/supervise/qmail-send/run I have: exec env - PATH='/var/qmail/bin:$PATH' QMAILREMOTE=/var/qmail/bin/spawn-filter FILTERARGS=/var/qmail/bin/dk-filter qmail-start '`cat /var/qmail/control/defaultdelivery`'In practice this works for 'normal' messages, but only because their RFC5322.From is usually identical to their RFC5321.MailFrom address, and the latter is contained in the environment variable SENDER when dk-filter gets invoked.

The SENDER environment variable which dk-filter uses is already set by spawn-filter earlier in the call chain.Howerver this is NULL for bounces, eventhough the RFC5233.From will be mailer-daemon@bouncedomain. The bouncedomain will be a value set by qmail-send from /var/qmail/control/meLooks like I have understood your problem and that problem will be there for all users. There are two issues. The first issue isn't really the blocker. The blocker is the wrong key being used for signing by the dk-filter script when the SENDER env variable is NULL.1. The libdkim library uses the following logic if (!sReturnPath.empty)sAddress.assign(sReturnPath);elseif (!sSender.empty)sAddress.assign(sSender);elseif (!sFrom.empty)sAddress.assign(sFrom);elsereturn false;This implies that it uses the envelope from address first for signing the domain. This should be like this if (!sSender.empty)sAddress.assign(sSender);elseif (!sFrom.empty)sAddress.assign(sFrom);elseif (!sReturnPath.empty)sAddress.assign(sReturnPath);elsereturn false;2.

The sender/from address comes from the SENDER environment variable. This variable is set by spawn-filter programThe spawn-filter gets this from the command line arguments passed to qmail-local / qmail-remote by qmail-lspawn, qmail-rspawn respectively. For bounces, this will be NULL.

The problem is that dk-filter falls back to using /var/qmail/control/domainkeys/default.One way to solve this is to use /var/qmail/control/me as the signing domain for bounces as the bounce will be from MAILER-Daemon@. The other solution is to define your default DKIM key in dk-filter rather than using a hardcoded var/qmail/control/domainkeys/defaultI am contemplating at using an environment variable DEFAULTDKIMKEY which dk-filter will use in such cases. You can set DEFAULTDKIMKEY like this exec env - PATH='/var/qmail/bin:$PATH' QMAILREMOTE=/var/qmail/bin/spawn-filter FILTERARGS=/var/qmail/bin/dk-filter DEFAULTDKIMKEY=/var/qmail/control/domainkeys/abcd.com qmail-start '`cat /var/qmail/control/defaultdelivery`'. HiFinally I have all working, but I decided not to use 'default' as 'default' selectorI used domainkey to generate the key # domainkey mydomain.com MYdkimI have in usr/local/etc/domainkeys/mydomain.com default - /usr/local/etc/domainkeys/mydomain.com/rsa.privateMYdkimrsa.privateMYdkimrsa.publicMYdkimselector# cat /usr/local/etc/domainkeys/mydomain.com/selectorMYdkimInside the DNS I added a txt as folow MYdkim.domainkey.mydomain.com. IN TXT 'v=DKIM1; k=rsa; t=y; p=xxxxxxxxxx'I'm using qmail-smtpd for signing outgoing messagesThe messages are signed, but with the wrong 'CNAME'I sent an email to 'auth-results@verifier.port25.com' and I have this answer DKIM check details:-Result: permerror (key 'default.domainkey.mydomain.com' doesn't exist)Any idea where is the error?. So you want your selector to be MYdkimThis is what you should do. Remember that the selector is always taken from the basename of the file that the environment variable DKIMKEY is set to.If the last component of the path is 'default', the selector will be default.

If the last component is MYdkim, the selector will by MYdkim.So your private key should be named MYdkim. I.e./web/conf/domainkeys/pablomurillo.com.ar/MYdkimThe file MYdkim can be a symbolic link too to the filename of your choice.and your public key could be named anything as it is not used internally by qmail-dkim /var/qmail/supervise/qmail-smtpd/runexport QMAILQUEUE=/var/qmail/bin/qmail-dkimexport DKIMKEY=/web/conf/domainkeys/%/MYdkim. Thank youto have such a long dns record under bind I had to split the domainkey as follows default.domainkey.mydomain.tld. IN TXT ('v=DKIM1; k=rsa; t=y; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqQZJmKV9pModJLj0fWPTYV8JTYkqp8Jb+nxSGmYjKvdDNgk26Uc7GYghF/lWxa8kXBxfbYmtr1vBUi2BIOK3ijIDntKqGJaljSyJSAh7SESbG6ob+45uF1V9gYMA4Lk1x/pMeExLR6f7qfKwoT'dRRw4BVs1aHy2iUZOJpHXD1hWG99AhbozhZVTgdCopqU3lFEYlpVQ/YdqiNmZpc04BVyOTG71VOCdm+MuCFpQYckWmxJIh8WFhaCDlIByE88uAupp+28538V9HSWIi3CIigQmD/OIQ/XwaXA7uO0VBEWw7+F1cAfvPdTTl/gal1EMg1FXdBq2ZVJVxHyZZs4H5KQIDAQAB')so that each line doesn't exceed 256 chars lenghtI tested this sending a test mail to check-auth@verifier.port25.com and the verification was good. Unfortunaly a test against gmail failed (verification failure) so I'm sticking with 1024 keys.Any hint would be appreciated. I've followed this howto concerning the long dns splitting and I'm still unable to pass the gmail dkim test.In addition, sending a test mail to check-auth@verifier.port25.com results in a wrong dns record interpretation (note the default.domainkey.mydomain.tld.

IN TXT inside): default.domainkey.mydomain.tld. 60 IN TXT 'v=DKIM1; k=rsa; t=y; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAopYfx74JYL12O5i8RJ1GqYxkbkTf9MXkeJ/4RLxJGrKLpGlYnFuKfAH8dZAtIqOpvaai9ipG/6kw2Sj7Ss6/qkutvdbfnKIl/9RsGws/xq3jCf9Zc19V0Zeo96FZI0PuvKqAKKxQar4j8WJ+eN1ahxe3 default.domainkey.pacinotti.edu.it.INTXT5hUIiYCnmx3Y80JXj89Qwie1l5G5xDl7jLICXa+kZJF+orfQ8KH0HURCmUCrRwJTvuTHI+zSgUcrjgrJnQjCkqkMhy3LAy/ybfAZnaYozloaqIoGZOeas4+X/O97OHhSq5EIRPLtJtyEFJ8WMbpDD7kql8ztS6jMulhIUjHZNBwcgnU0bSw2mO9nu8uxLwIDAQAB'while my dkim record(s) is default.domainkey.mydomain.tld.

IN TXT ('v=DKIM1; k=rsa; t=y; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAopYfx74JYL12O5i8RJ1GqYxkbkTf9MXkeJ/4RLxJGrKLpGlYnFuKfAH8dZAtIqOpvaai9ipG/6kw2Sj7Ss6/qkutvdbfnKIl/9RsGws/xq3jCf9Zc19V0Zeo96FZI0PuvKqAKKxQar4j8WJ+eN1ahxe3'default.domainkey.mydomain.tld. IN TXT '5hUIiYCnmx3Y80JXj89Qwie1l5G5xDl7jLICXa+kZJF+orfQ8KH0HURCmUCrRwJTvuTHI+zSgUcrjgrJnQjCkqkMhy3LAy/ybfAZnaYozloaqIoGZOeas4+X/O97OHhSq5EIRPLtJtyEFJ8WMbpDD7kql8ztS6jMulhIUjHZNBwcgnU0bSw2mO9nu8uxLwIDAQAB')Note that check-auth@verifier.port25.com was not complaining when setting my dns like this default.domainkey.mydomain.tld. IN TXT ('v=DKIM1; k=rsa; t=y; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAopYfx74JYL12O5i8RJ1GqYxkbkTf9MXkeJ/4RLxJGrKLpGlYnFuKfAH8dZAtIqOpvaai9ipG/6kw2Sj7Ss6/qkutvdbfnKIl/9RsGws/xq3jCf9Zc19V0Zeo96FZI0PuvKqAKKxQar4j8WJ+eN1ahxe3'5hUIiYCnmx3Y80JXj89Qwie1l5G5xDl7jLICXa+kZJF+orfQ8KH0HURCmUCrRwJTvuTHI+zSgUcrjgrJnQjCkqkMhy3LAy/ybfAZnaYozloaqIoGZOeas4+X/O97OHhSq5EIRPLtJtyEFJ8WMbpDD7kql8ztS6jMulhIUjHZNBwcgnU0bSw2mO9nu8uxLwIDAQAB')On the contrary mxtoolbox.com tests are ok. Great, gmail verification passed!My dns is like this: default.domainkey.mydomain.it. I've noticed that Sky UK is sending out legitimate emails including a dkim signature that does NOT include the subject:DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=skymail.sky.com;s=5601; t=; x=;bh=.; h= From:Reply-To;I don't think excluding the subject from the signature is against the spec, even if it is silly. It does, however, fail verificationI've added this option to qmail-dkim.c to relax this restriction:if (envget('UNSIGNEDFROM'))vopts.nAllowUnsignedFromHeaders = 1;vopts.nSubjectRequired = 1;DKIMVerifyInit(&ctxt, &vopts); /.- this is always successful./This value ensures it will permit a signature that does not include the subjectIt may be worth making this configurable (with an environment variable or a switch to DKIMVERIFY?). Hi,even if I installed the latest patch on my system I'm not able to receive password reset email from GitHub.I created another account on GitHub using a Gmail account and on that account I receive the email correctly.Can you help me to understand why on my server it is failing?These are the DKIM headers i receive on Gmail account for the pasword reset email:Received: from github-smtp2b-ext-cp1-prd.iad.github.net (github-smtp2-ext6.iad.github.net.

Problem: Marcelo was receiving an email where the content of the email was changed (in particular the Subject header).This caused qmail-dkim to issue the following errorJ - DKIMSIGNATUREBADBUTTESTING - signature error: RSA verify failed but testingThe man page states that DKIMVERIFY should have the letter j for returning temporary error and the letter J for issuing permanent error.It does not mention that if you omit the letter 'j' or the letter 'J', the email will successfully pass through the queue and get delivered.So should I modify the qmail-dkim patch for this change in the man page. Most of the dkim verification error results because the message gets modified by some filter before qmail-dkim and you could potentially lose email, like Marcelo.The troubleshooting test that Marcelo was doing also failed because DKIMVERIFY had the small letter 'j'. If he omits the leter 'j', he should get the output along with the DKIM-Status header.

My view is that if you do not want to lose emails and you do not have the habit of looking at the logs for temporary errors, the letters 'j' or 'J' should be completely omitted from DKIMVERIFY. I had the DKIM working for years and due to this error i was getting i made the update to your latest patch on today but the problem still persist.I'm able to receive mail from gmail and other DKIM enabled servers but not this one. You have the letter 'j' in DKIMVERIFY. So qmail-dkim will not exit with 100.

Have QMAILQUEUE changed temporarily to bypass qmail-dkim and check. If you still do not receive email then it could be something else. If you receive the qmailexport QMAILQUEUE=/var/qmail/bin/qmail-scanner-queueAfter making the above change, save the incoming email to /tmp/mail.txt and you can do the following to troubleshootcat mail.txt env - DKIMVERIFY='FGHIKLMNOQRTUVWjp' DKIMQUEUE=/bin/cat /var/qmail/bin/qmail-dkim.

Qmail-dkim does not have an issue with assembling long text records. E.g.$ dig -t txt insideapple2048.domainkey.insideapple.apple.com; DiG 9.9.6-P1-RedHat-9.9.6-11.P1.fc21 -t txt insideapple2048.domainkey.insideapple.apple.com;; global options: +cmd;; Got answer:;; -HEADER.

I have debugged the issue with help of the raw email. There were two issues.

The first issue is verifiying if the signature has expired. This is done by using t= and x= tags. Unfortunately, one of the funtions is using an integer variable to compare the timestamps and due to this, the signature is shown as expired. This issue was easy to fix and I have made the changesThe second problem is X-Brightmail-Tracker header inserted below the DKIM-Signature. This causes the signature not to verify. After removing the X-Brightmail-Tracker, I am able to verify the signature as good.

Ipview se windows 7. How to install Microsoft.NET Framework 3.5.1 on Windows 7Microsoft.NET Framework version 3.5.1 is included with Windows 7.

This issue can be solved by ignoring headers not present in the h= tag. However, since this part of the code is from ALT-N technologies, I might take some time to add some code to skip such headers.

I will get back as soon as possible with a fix. If I cannot find a way to fix this, I can always put a wrapper before calling qmail-dkim to skip headers not present in the h= tag.

AboutThis is animplementation for.SPF is something like a DNS based 'reverse MX' system todesignate permitted senders for mails depending on the domain name.The goal is to disallow sender address forgery.The patch is entirely written using the qmail string and DNS functions, and thuscompletely integrated into qmail without external dependencies.It can check incoming mails inside the SMTP daemon, add Received-SPF linesand optionally block undesired transfers. The check is performed atthe envelope level. DescriptionInstallation:I suppose you are already familiar with qmail patching since a nakedqmail is pretty useless these days (no authentication, filtering.).Unpack the qmail-1.03.tar.gz archive using something like:tar xvfz /path/to/qmail-1.03.tar.gzChange into the directory and apply the patch using:patch -p1.patchIf you already had patches applied there will most likely be rejects,especially in the Makefile.