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plugins:opendkim [2017/04/24 21:30] nuxwin |
plugins:opendkim [2017/09/25 18:04] nuxwin |
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- | See https://github.com/i-MSCP/plugins/blob/master/incubator/OpenDKIM/README.md | + | <WRAP center round important 60%> |
+ | **Bear in mind that this documentation is for the last available version. If you use an older version, you must refer to the README.md file inside the plugin archive.** | ||
+ | </WRAP> | ||
+ | <markdown> | ||
+ | # i-MSCP OpenDKIM plugin | ||
+ | |||
+ | Provides DomainKeys Identified Mail (DKIM) service through MILTER. | ||
+ | |||
+ | ## Introduction | ||
+ | |||
+ | DKIM provides a way for senders to confirm their identity when sending email by | ||
+ | adding a cryptographic signature to the headers of the message. | ||
+ | |||
+ | ## Requirements | ||
+ | |||
+ | - i-MSCP Serie ≥ 1.4.x | ||
+ | |||
+ | ## Installation | ||
+ | |||
+ | 1. Upload the plugin through the plugin management interface | ||
+ | 2. Install the plugin through the plugin management interface | ||
+ | |||
+ | ## Update | ||
+ | |||
+ | 1. Be sure that all requirements as stated in the requirements section are met | ||
+ | 2. Backup your plugin configuration file if needed | ||
+ | 3. Upload the plugin through the plugin management interface | ||
+ | |||
+ | ### Restore you plugin configuration file if needed | ||
+ | |||
+ | 1. Restore your plugin configuration file (compare it with the new version | ||
+ | first) | ||
+ | 2. Update the plugin list through the plugin management interface | ||
+ | |||
+ | ## Configuration | ||
+ | |||
+ | See [Configuration file](https://github.com/i-MSCP/plugins/blob/master/incubator/OpenDKIM/config.php) | ||
+ | |||
+ | When changing a configuration parameter in the plugin configuration file, don't | ||
+ | forget to trigger a plugin list update, else you're changes will not be token | ||
+ | into account. | ||
+ | |||
+ | ## Plugin working level | ||
+ | |||
+ | It is possible to choose the plugin working level through the | ||
+ | `plugin_working_level` plugin configuration parameter. There are actually two | ||
+ | working levels which are `admin` and `reseller`. | ||
+ | |||
+ | When it works at the `admin` level, the plugin activates OpenDKIM for all | ||
+ | customers automatically. In this working level, resellers can only trigger | ||
+ | renewal of DKIM keys through their own management interface. | ||
+ | |||
+ | When it works at `reseller` level, the plugin doesn't activate OpenDKIM | ||
+ | automatically for customers. Resellers must enable the OpenDKIM feature | ||
+ | manually for all of their customers. | ||
+ | |||
+ | ## Usage of an external DNS server | ||
+ | |||
+ | If you make use of an external DNS server (not the one managed by i-MSCP), you | ||
+ | must not forget to add the DKIM and ADSP DNS resource records in the zone of | ||
+ | your domain. | ||
+ | |||
+ | Each domain has one DKIM and one ADSP DNS resource records and each subdomain has | ||
+ | one ADSP resource record. | ||
+ | |||
+ | ## Testing | ||
+ | |||
+ | ### Internal DKIM test | ||
+ | |||
+ | You can check on the command line if OpenDKIM is working for your domain by | ||
+ | running the following command: | ||
+ | |||
+ | ``` | ||
+ | opendkim-testkey -d example.com -s mail -vvv | ||
+ | ``` | ||
+ | |||
+ | The result should look similar like this one: | ||
+ | |||
+ | ``` | ||
+ | root@jessie32:/etc/opendkim# opendkim-testkey -d weird.test.bbox.nuxwin.com -s mail -vvv | ||
+ | opendkim-testkey: using default configfile /etc/opendkim.conf | ||
+ | opendkim-testkey: checking key 'mail._domainkey.weird.test.bbox.nuxwin.com' | ||
+ | opendkim-testkey: key not secure | ||
+ | opendkim-testkey: key OK | ||
+ | ``` | ||
+ | |||
+ | Note that the `key not secure` message doesn't indicate an error. It is the | ||
+ | expected consequence of not using DNSSSEC. | ||
+ | |||
+ | You can also query your DNS server to check the TXT record for your domain: | ||
+ | |||
+ | ``` | ||
+ | dig -t txt mail._domainkey.example.com | ||
+ | ``` | ||
+ | |||
+ | ### External DKIM test | ||
+ | |||
+ | Go to [dkimvalidator.com](http://dkimvalidator.com) and send a mail from the | ||
+ | domain for which you activated OpenDKIM to the random mail address. Once you | ||
+ | have sent the mail, wait few seconds and then, click on the `View Results` | ||
+ | button. You should get a result similar to: | ||
+ | |||
+ | #### Original Message | ||
+ | |||
+ | ``` | ||
+ | Received: from jessie32.bbox.nuxwin.com (xxx-xxx-xx-xx.abo.bbox.fr [xxx.xxx.xx.xx]) | ||
+ | by relay-4.us-west-2.relay-prod (Postfix) with ESMTPS id 9B57F160208 | ||
+ | for <[email protected]>; Sat, 2 Sep 2017 18:29:48 +0000 (UTC) | ||
+ | Received: from panel.bbox.nuxwin.com (jessie32.bbox.nuxwin.com.local [127.0.0.1]) | ||
+ | (Authenticated sender: [email protected]) | ||
+ | by jessie32.bbox.nuxwin.com (Postfix) with ESMTPA id F3E645FC6A | ||
+ | for <[email protected]>; Sat, 2 Sep 2017 20:30:21 +0200 (CEST) | ||
+ | DKIM-Filter: OpenDKIM Filter v2.9.2 jessie32.bbox.nuxwin.com F3E645FC6A | ||
+ | DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; | ||
+ | d=weird.test.bbox.nuxwin.com; s=mail; t=1504377022; | ||
+ | [email protected]; | ||
+ | bh=g3zLYH4xKxcPrHOD18z9YfpQcnk/GaJedfustWU5uGs=; | ||
+ | h=Date:From:To:Subject:From; | ||
+ | b=HdAyJ/C0tBH5UkzZSGXo2ESZ6+8tCr1O/LC3REVuyRg1TSB/bYGDAv/H05+nJSisD | ||
+ | fExsy/Irnjjz5bVNSUq0nB8mPoHaTMibh9mWAC/Q23WDsu9j9vprH5TGw0k91UUuur | ||
+ | XQm2anEaugJtvEpCSdOf3CMHlxUF9M/oMti+Bm0N/aoqsvu1vRZHazQH4PUMd+Thyq | ||
+ | PtnEx4ZPQaU/f1HOdZTi7c4KjwWHoLDdQ1mNAwknUMjm5hsw2MGIIW0ecumNqzzKZH | ||
+ | vIFhX75q2Hw03rByI5paaUrf6bAEozOmQghDTzz+07pn/aYhoK+jNYMEvev/F8pRqz | ||
+ | 596UbuEZYMC1w== | ||
+ | MIME-Version: 1.0 | ||
+ | Content-Type: text/plain; charset=US-ASCII; | ||
+ | format=flowed | ||
+ | Content-Transfer-Encoding: 7bit | ||
+ | Date: Sat, 02 Sep 2017 20:30:21 +0200 | ||
+ | From: [email protected] | ||
+ | To: [email protected] | ||
+ | Subject: test | ||
+ | Message-ID: <[email protected]> | ||
+ | X-Sender: [email protected] | ||
+ | User-Agent: Roundcube Webmail/1.2.5 | ||
+ | |||
+ | test | ||
+ | ``` | ||
+ | |||
+ | #### DKIM Information | ||
+ | |||
+ | ``` | ||
+ | DKIM Signature | ||
+ | |||
+ | Message contains this DKIM Signature: | ||
+ | DKIM-Filter: OpenDKIM Filter v2.9.2 jessie32.bbox.nuxwin.com F3E645FC6A | ||
+ | DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; | ||
+ | d=weird.test.bbox.nuxwin.com; s=mail; t=1504377022; | ||
+ | [email protected]; | ||
+ | bh=g3zLYH4xKxcPrHOD18z9YfpQcnk/GaJedfustWU5uGs=; | ||
+ | h=Date:From:To:Subject:From; | ||
+ | b=HdAyJ/C0tBH5UkzZSGXo2ESZ6+8tCr1O/LC3REVuyRg1TSB/bYGDAv/H05+nJSisD | ||
+ | fExsy/Irnjjz5bVNSUq0nB8mPoHaTMibh9mWAC/Q23WDsu9j9vprH5TGw0k91UUuur | ||
+ | XQm2anEaugJtvEpCSdOf3CMHlxUF9M/oMti+Bm0N/aoqsvu1vRZHazQH4PUMd+Thyq | ||
+ | PtnEx4ZPQaU/f1HOdZTi7c4KjwWHoLDdQ1mNAwknUMjm5hsw2MGIIW0ecumNqzzKZH | ||
+ | vIFhX75q2Hw03rByI5paaUrf6bAEozOmQghDTzz+07pn/aYhoK+jNYMEvev/F8pRqz | ||
+ | 596UbuEZYMC1w== | ||
+ | |||
+ | Signature Information: | ||
+ | v= Version: 1 | ||
+ | a= Algorithm: rsa-sha256 | ||
+ | c= Method: relaxed/simple | ||
+ | d= Domain: weird.test.bbox.nuxwin.com | ||
+ | s= Selector: mail | ||
+ | q= Protocol: | ||
+ | bh= g3zLYH4xKxcPrHOD18z9YfpQcnk/GaJedfustWU5uGs= | ||
+ | h= Signed Headers: Date:From:To:Subject:From | ||
+ | b= Data: HdAyJ/C0tBH5UkzZSGXo2ESZ6+8tCr1O/LC3REVuyRg1TSB/bYGDAv/H05+nJSisD | ||
+ | fExsy/Irnjjz5bVNSUq0nB8mPoHaTMibh9mWAC/Q23WDsu9j9vprH5TGw0k91UUuur | ||
+ | XQm2anEaugJtvEpCSdOf3CMHlxUF9M/oMti+Bm0N/aoqsvu1vRZHazQH4PUMd+Thyq | ||
+ | PtnEx4ZPQaU/f1HOdZTi7c4KjwWHoLDdQ1mNAwknUMjm5hsw2MGIIW0ecumNqzzKZH | ||
+ | vIFhX75q2Hw03rByI5paaUrf6bAEozOmQghDTzz+07pn/aYhoK+jNYMEvev/F8pRqz | ||
+ | 596UbuEZYMC1w== | ||
+ | Public Key DNS Lookup | ||
+ | |||
+ | Building DNS Query for mail._domainkey.weird.test.bbox.nuxwin.com | ||
+ | Retrieved this publickey from DNS: v=DKIM1; h=sha256; k=rsa; s=email; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsGfEnQP49L7DrUvR8/cPOciHvATQkxXTgBm4qUcNFFDLnT6s45xsmU068RTED/QGJWaeL2eQcd7c5p7dlUdqVugYSfB+aDjOJuvPIr3P/jiISt6HERoBafu7pkc2mj92S70Xq3Jyx6lgIhMe63UGKyeyuBJHB7Nm3KHHiZFqH7AWtQwgBpMqa7LKPj4OCIELZ+G8SO8OMAkytLndDf40lABXXHsyjFSTaOPb27BStTLBmZT58AwPtSHTZ7+8hz+reHZDUXMos96SiwcvxOepDMSBMMdKpAI7iu+v86F+ewaMRllAogVIAFZb68DgjAUvk6fwDE4mwGyGk1y7QdKVEwIDAQAB | ||
+ | Validating Signature | ||
+ | |||
+ | result = pass | ||
+ | Details: | ||
+ | ``` | ||
+ | |||
+ | #### SPF Information | ||
+ | |||
+ | ``` | ||
+ | Using this information that I obtained from the headers | ||
+ | |||
+ | Helo Address = jessie32.bbox.nuxwin.com | ||
+ | From Address = [email protected] | ||
+ | From IP = xxx.xxx.xx.xx | ||
+ | SPF Record Lookup | ||
+ | |||
+ | Looking up TXT SPF record for sub1.weird.test.bbox.nuxwin.com | ||
+ | Found the following namesevers for sub1.weird.test.bbox.nuxwin.com: | ||
+ | Retrieved this SPF Record: zone updated 20170902 (TTL = 43897) | ||
+ | Using local nameserver for SPF resolution. This will probably be cached! | ||
+ | Result: pass (Mechanism 'include:weird.test.bbox.nuxwin.com' matched) | ||
+ | |||
+ | Result code: pass | ||
+ | Local Explanation: sub1.weird.test.bbox.nuxwin.com: Sender is authorized to use '[email protected]' in 'mfrom' identity (mechanism 'include:weird.test.bbox.nuxwin.com' matched) | ||
+ | spf_header = Received-SPF: pass (sub1.weird.test.bbox.nuxwin.com: Sender is authorized to use '[email protected]' in 'mfrom' identity (mechanism 'include:weird.test.bbox.nuxwin.com' matched)) receiver=dkimvalidator.com; identity=mailfrom; envelope-from="[email protected]"; helo=jessie32.bbox.nuxwin.com; client-ip=xxx.xxx.xx.xx | ||
+ | ``` | ||
+ | |||
+ | Regarding the SpamAssassin information at bottom, you can ignore them as the | ||
+ | SpamAssassin installation used is not able to validate DKIM signatures when | ||
+ | DKIM ADSP extension is involved. | ||
+ | |||
+ | ## License | ||
+ | |||
+ | i-MSCP OpenDKIM plugin | ||
+ | Copyright (C) 2013-2017 Laurent Declercq <[email protected]> | ||
+ | Copyright (C) 2013-2016 Rene Schuster <[email protected]> | ||
+ | Copyright (C) 2013-2016 Sascha Bay <[email protected]> | ||
+ | |||
+ | 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; version 2 of the License | ||
+ | |||
+ | 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. | ||
+ | </markdown> |