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docs\\12-douze.html

docs\\12-douze.html 165 KB
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    2. 

  2. <meta charset="utf-8">
    3. 

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  4. <style type="text/css">
    5. 

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    10. 

  10.   @media (min-width: 992px) {
    11. 

  11.     .container{
    12. 

  12.       width: 980px;
    13. 

  13.       margin-right: auto;
    14. 

  14.       margin-left: auto;
    15. 

  15.       position: relative;
    16. 

  16.       margin-top: 16px;
    17. 

  17.       margin-bottom: 16px;
    18. 

  18.       border: 1px solid #ddd;
    19. 

  19.       border-radius: 3px;
    20. 

  20.     }
    21. 

  21.   }
    22. 

  22. </style>
    23. 

  23. </head>
    24. 

  24. <body><div id="readme" class="container"><article class="markdown-body entry-content"><h1 id="spf-dkim-opendmarc">SPF, DKIM, OPENDMARC</h1>
    25. 

  25. <h2 id="spf">SPF</h2>
    26. 

  26. <h3 id="ajout-des-enregistrements-spf-au-fichier-de-zone-dns">Ajout des enregistrements <strong>spf</strong> au fichier de zone DNS</h3>
    27. 

  27. <p>Nous allons maintenant ajouter un enregistrement <strong>spf</strong> &#xE0; notre configuration. SPF est un enregistrement qui d&#xE9;clare quelle machine est responsable et autoris&#xE9;e &#xE0; envoyer des mails pour notre domaine. Cela permet d&apos;&#xE9;viter que nos mails soient consid&#xE9;r&#xE9;s comme du <strong>spam</strong>.</p>
    28. 

  28. <p>La syntaxe de la ligne &#xE0; ajouter est assez simple. Il existe des g&#xE9;n&#xE9;rateurs de ligne SPF, comme:</p>
    29. 

  29. <ul>
    30. 

  30. <li><a href="https://www.spfwizard.net/">spfwizard</a></li>
    31. 

  31. </ul>
    32. 

  32. <p>ou</p>
    33. 

  33. <ul>
    34. 

  34. <li><a href="https://mxtoolbox.com/SPFRecordGenerator.aspx">mxtoolbox</a>.</li>
    35. 

  35. </ul>
    36. 

  36. <p>Le site <a href="http://www.openspf.org/">openspf</a> contient tout ce qu&apos;il faut savoir &#xE0; propos de SPF, syntaxe, param&#xE8;tres etc ...</p>
    37. 

  37. <p>Pour mon serveur, j&apos;ai choisi une politique stricte de rejet des mails qui ne viennent pas d&apos;une source autoris&#xE9;e.</p>
    38. 

  38. <p>Voici la ligne &#xE0; rajouter au fichier de zone. C&apos;est le param&#xE8;tre &quot;-all&quot; qui d&#xE9;termine la politique (de rejet ici). Nous aurions pu mettre <strong>~all</strong> pour une politique moins stricte. (notez le <strong>~** &#xE0; la place du **-</strong>)</p>
    39. 

  39. <pre><code class="language-shell">; spf
    40. 

  40. yojik.net.       IN      TXT     &quot;v=spf1 a mx mx:adara.yojik.net a:adara.yojik.net -all&quot;
    41. 

  41. yojik.net.       IN      SPF     &quot;v=spf1 a mx mx:adara.yojik.net a:adara.yojik.net -all&quot;</code></pre>
    42. 

  42. <p>On recharge bind pour la prise en compte des modifications:</p>
    43. 

  43. <pre><code class="language-shell">service bind9 restart</code></pre>
    44. 

  44. <p>Il nous reste &#xE0; configurer postfix pour prendre en compte cet enregistrement et effectuer les validations.</p>
    45. 

  45. <h3 id="installation-des-logiciels-n-cessaires">Installation des logiciels n&#xE9;cessaires</h3>
    46. 

  46. <pre><code class="language-shell">root@atom:/etc/bind# apt-get install postfix-policyd-spf-python
    47. 

  47. Lecture des listes de paquets... Fait
    48. 

  48. Construction de l&apos;arbre des d&#xE9;pendances
    49. 

  49. Lecture des informations d&apos;&#xE9;tat... Fait
    50. 

  50. The following additional packages will be installed:
    51. 

  51.   python3-authres python3-dns python3-spf
    52. 

  52. Paquets sugg&#xE9;r&#xE9;s :
    53. 

  53.   python3-yaml
    54. 

  54. Les NOUVEAUX paquets suivants seront install&#xE9;s :
    55. 

  55.   postfix-policyd-spf-python python3-authres python3-dns python3-spf
    56. 

  56. 0 mis &#xE0; jour, 4 nouvellement install&#xE9;s, 0 &#xE0; enlever et 12 non mis &#xE0; jour.
    57. 

  57. Il est n&#xE9;cessaire de prendre 153 ko dans les archives.
    58. 

  58. Apr&#xE8;s cette op&#xE9;ration, 494 ko d&apos;espace disque suppl&#xE9;mentaires seront utilis&#xE9;s.
    59. 

  59. Souhaitez-vous continuer ? [O/n] o
    60. 

  60. R&#xE9;ception de:1 http://deb.debian.org/debian stretch/main amd64 python3-dns all 3.1.1-1 [27,5 kB]
    61. 

  61. R&#xE9;ception de:2 http://deb.debian.org/debian stretch/main amd64 python3-authres all 0.900-1 [17,5 kB]
    62. 

  62. R&#xE9;ception de:3 http://deb.debian.org/debian stretch/main amd64 python3-spf all 2.0.12t-3 [64,1 kB]
    63. 

  63. R&#xE9;ception de:4 http://deb.debian.org/debian stretch/main amd64 postfix-policyd-spf-python all 2.0.1-1 [43,8 kB]
    64. 

  64. 153 ko r&#xE9;ceptionn&#xE9;s en 0s (1 533 ko/s)
    65. 

  65. S&#xE9;lection du paquet python3-dns pr&#xE9;c&#xE9;demment d&#xE9;s&#xE9;lectionn&#xE9;.
    66. 

  66. (Lecture de la base de donn&#xE9;es... 40435 fichiers et r&#xE9;pertoires d&#xE9;j&#xE0; install&#xE9;s.)
    67. 

  67. Pr&#xE9;paration du d&#xE9;paquetage de .../python3-dns_3.1.1-1_all.deb ...
    68. 

  68. D&#xE9;paquetage de python3-dns (3.1.1-1) ...
    69. 

  69. S&#xE9;lection du paquet python3-authres pr&#xE9;c&#xE9;demment d&#xE9;s&#xE9;lectionn&#xE9;.
    70. 

  70. Pr&#xE9;paration du d&#xE9;paquetage de .../python3-authres_0.900-1_all.deb ...
    71. 

  71. D&#xE9;paquetage de python3-authres (0.900-1) ...
    72. 

  72. S&#xE9;lection du paquet python3-spf pr&#xE9;c&#xE9;demment d&#xE9;s&#xE9;lectionn&#xE9;.
    73. 

  73. Pr&#xE9;paration du d&#xE9;paquetage de .../python3-spf_2.0.12t-3_all.deb ...
    74. 

  74. D&#xE9;paquetage de python3-spf (2.0.12t-3) ...
    75. 

  75. S&#xE9;lection du paquet postfix-policyd-spf-python pr&#xE9;c&#xE9;demment d&#xE9;s&#xE9;lectionn&#xE9;.
    76. 

  76. Pr&#xE9;paration du d&#xE9;paquetage de .../postfix-policyd-spf-python_2.0.1-1_all.deb ...
    77. 

  77. D&#xE9;paquetage de postfix-policyd-spf-python (2.0.1-1) ...
    78. 

  78. Param&#xE9;trage de python3-authres (0.900-1) ...
    79. 

  79. Param&#xE9;trage de python3-dns (3.1.1-1) ...
    80. 

  80. Traitement des actions diff&#xE9;r&#xE9;es (&#xAB; triggers &#xBB;) pour man-db (2.7.6.1-2) ...
    81. 

  81. Param&#xE9;trage de python3-spf (2.0.12t-3) ...
    82. 

  82. Param&#xE9;trage de postfix-policyd-spf-python (2.0.1-1) ...
    83. 

  83. root@atom:/etc/bind#</code></pre>
    84. 

  84. <h3 id="configuration-de-postfix-master-cf">Configuration de postfix: master.cf</h3>
    85. 

  85. <p>Dans le fichier /etc/postfix/master.cf, il faut rajouter le service suivant:</p>
    86. 

  86. <pre><code class="language-shell">policyd-spf  unix  -       n       n       -       0       spawn
    87. 

  87.     user=policyd-spf argv=/usr/bin/policyd-spf</code></pre>
    88. 

  88. <h3 id="configuration-de-postfix-main-cf">Configuration de postfix: main.cf</h3>
    89. 

  89. <p>Il nous faut ajouter la r&#xE8;gle correspondante dans la lsite des restrictions de main.cf. Bien afire attention de positionner <strong>check_policy_service</strong> APR&#xC8;S <strong>reject_unauth_destination</strong>, sinon, votre serveur mail devient <strong>openrelay</strong>!</p>
    90. 

  90. <pre><code class="language-shell">smtpd_recipient_restrictions =
    91. 

  91.             ...
    92. 

  92.             reject_unauth_destination
    93. 

  93.             check_policy_service unix:private/policyd-spf
    94. 

  94.             ...
    95. 

  95. 

  96. policyd-spf_time_limit = 3600</code></pre>
    97. 

  97. <p>Relancez <strong>postfix</strong>:</p>
    98. 

  98. <pre><code class="language-shell">service postfix restart</code></pre>
    99. 

  99. <h3 id="test">Test</h3>
    100. 

  100. <p>Je teste ma configuration sur les sites:</p>
    101. 

  101. <ul>
    102. 

  102. <li><a href="https://mxtoolbox.com/">Mxtoolbox</a></li>
    103. 

  103. <li><a href="https://kitterman.com/spf/validate.html">Kitterman</a></li>
    104. 

  104. <li><a href="https://www.mail-tester.com/spf-dkim-check">Mail-tester</a></li>
    105. 

  105. </ul>
    106. 

  106. <p>Les tests ne fonctionnent pas ... en fait, cela vient de la config IPV6 du serveur. La configuration automatique avec privext 2 donne plusieurs adresses IPV6 &#xE0; la machine (avec le m&#xEA;me pr&#xE9;fixe, bien s&#xFB;r). Mais l&apos;adresse de la machine ne correspond plus &#xE0; l&apos;adresse de la machine d&#xE9;clar&#xE9;e dans bind. Et SPF ne peut plus fonctionner.</p>
    107. 

  107. <p>La solution a &#xE9;t&#xE9; de configurer manuellement l&apos;adresse IPV6 dans /etc/network/interfaces de la fa&#xE7;on suivante:</p>
    108. 

  108. <pre><code class="language-shell">iface enp2s0 inet6 static
    109. 

  109. address 2a01:e0a:54:c220:3aea:a7ff:fea6:cf93
    110. 

  110. netmask 64
    111. 

  111. gateway 2a01:e0a:54:c220:OOOO:0000:000:0001</code></pre>
    112. 

  112. <p>On va aussi modifier la configuration de Postfix pour permettre l&apos;envoi de messages de l&apos;ext&#xE9;rieur de la machine (uniquement les utilisateurs enregistr&#xE9;s, bien s&#xFB;r).</p>
    113. 

  113. <p>J&apos;ai modifi&#xE9; /etc/postfix/main.cf de la fa&#xE7;on suivante: j&apos;ai ajout&#xE9; ceci au fichier:</p>
    114. 

  114. <pre><code class="language-shell">smtpd_recipient_restrictions =
    115. 

  115.         permit_sasl_authenticated,
    116. 

  116.         permit_mynetworks,
    117. 

  117.         reject_unauth_destination,
    118. 

  118.         check_policy_service unix:private/policyd-spf</code></pre>
    119. 

  119. <p>et comment&#xE9; les lignes correspondantes dans la section submission et smtps du fichier /etc/postfix/master.cf:</p>
    120. 

  120. <pre><code class="language-shell">#  -o smtpd_sender_restrictions=$mua_sender_restrictions</code></pre>
    121. 

  121. <p>J&apos;ai simplement transf&#xE9;r&#xE9; les restrictions <strong>smtpd_sender_restrictions</strong> qui &#xE9;taient dans main.cf dans master.cf.</p>
    122. 

  122. <p>Apr&#xE8;s modifications, tout marche comme il faut, v&#xE9;rification SPF comprise.</p>
    123. 

  123. <pre><code class="language-shell">root@atom:/home/ericadmin# tail -f /var/log/mail.log
    124. 

  124. May 28 11:58:06 atom dovecot: imap-login: Login: user=&lt;ericadmin&gt;, method=PLAIN, rip=192.168.111.150, lip=192.168.111.240, mpid=1901, TLS, session=&lt;I0V6J0FtWODAqG+W&gt;
    125. 

  125. May 28 11:58:26 atom postfix/smtpd[1902]: connect from adara.yojik.eu[91.121.72.10]
    126. 

  126. May 28 11:58:26 atom policyd-spf[1907]: prepend Received-SPF: Pass (mailfrom) identity=mailfrom; client-ip=91.121.72.10; helo=adara.yojik.eu; envelope-from=eric@yojik.eu; receiver=&lt;UNKNOWN&gt;
    127. 

  127. May 28 11:58:26 atom postfix/smtpd[1902]: C701DD004F2: client=adara.yojik.eu[91.121.72.10]
    128. 

  128. May 28 11:58:26 atom postfix/cleanup[1908]: C701DD004F2: message-id=&lt;4c621385-3822-cb78-9c1d-7e9f43c3fc52@yojik.eu&gt;
    129. 

  129. May 28 11:58:26 atom postfix/qmgr[867]: C701DD004F2: from=&lt;eric@yojik.eu&gt;, size=1414, nrcpt=1 (queue active)
    130. 

  130. May 28 11:58:26 atom postfix/smtpd[1902]: disconnect from adara.yojik.eu[91.121.72.10] ehlo=2 starttls=1 mail=1 rcpt=1 data=1 quit=1 commands=7
    131. 

  131. May 28 11:58:26 atom postfix/local[1909]: C701DD004F2: to=&lt;ericadmin@yojik.net&gt;, relay=local, delay=0.23, delays=0.21/0.01/0/0, dsn=2.0.0, status=sent (delivered to maildir)
    132. 

  132. May 28 11:58:26 atom postfix/qmgr[867]: C701DD004F2: removed
    133. 

  133. May 28 11:59:00 atom dovecot: imap-login: Login: user=&lt;ericadmin&gt;, method=PLAIN, rip=192.168.111.150, lip=192.168.111.240, mpid=1915, TLS, session=&lt;FoqwKkFtduDAqG+W&gt;</code></pre>
    134. 

  134. <p>La ligne *<em>May 28 11:43:12 atom policyd-spf[1830]: prepend Received-SPF: Pass (mailfrom) identity=mailfrom; *</em> montre que notre contr&#xF4;le SPF fonctionne comme il faut.</p>
    135. 

  135. <h2 id="dkim">DKIM</h2>
    136. 

  136. <p>DKIM (DomainKeys Identified Mail) est un syst&#xE8;me qui vous permet d&apos;ajouter aux ent&#xEA;tes de vos &#xE9;mails une signature qui vous identifie et qui permet aux autres serveurs mails de la v&#xE9;rifier. L&apos;ent&#xEA;te peut &#xEA;tre configur&#xE9; pour garantir que le mail n&apos;a pas &#xE9;t&#xE9; modifi&#xE9; apr&#xE8;s signature (on peut g&#xE9;n&#xE9;rer une clef qui signe tout ou partie du message, selon configuration)</p>
    137. 

  137. <p>L&apos;installation et la configuration de DKIM n&#xE9;cessite 3 &#xE9;tapes:</p>
    138. 

  138. <h3 id="configuration-de-dkim">Configuration de DKIM</h3>
    139. 

  139. <p>  Nous commen&#xE7;ons par l&apos;installation de opendkim.</p>
    140. 

  140. <pre><code class="language-shell">root@atom:/home/ericadmin# apt install opendkim
    141. 

  141. Lecture des listes de paquets... Fait
    142. 

  142. Construction de l&apos;arbre des d&#xE9;pendances
    143. 

  143. Lecture des informations d&apos;&#xE9;tat... Fait
    144. 

  144. The following additional packages will be installed:
    145. 

  145. dns-root-data liblua5.1-0 libmemcached11 libmemcachedutil2 libmilter1.0.1 libopendbx1 libopendbx1-sqlite3 libopendkim11 librbl1 libunbound2 libvbr2
    146. 

  146. Paquets sugg&#xE9;r&#xE9;s :
    147. 

  147. ... etc ...</code></pre>
    148. 

  148. <p>  Une fois install&#xE9;, nous allons configurer opendkim: cela se fait dans le fichier /etc/opendkim.conf</p>
    149. 

  149. <p>  Cr&#xE9;ation des r&#xE9;pertoires:</p>
    150. 

  150. <pre><code class="language-shell">mkdir -p /etc/opendkim/keys/yojik.net/</code></pre>
    151. 

  151. <p>  Permissions:</p>
    152. 

  152. <pre><code class="language-shell">chmod u=rw,go=r /etc/opendkim.conf
    153. 

  153. chown -R opendkim:opendkim /etc/opendkim
    154. 

  154. chmod go-rw /etc/opendkim/keys</code></pre>
    155. 

  155. <p>  Un fichier opendkim.conf enti&#xE8;rement comment&#xE9; est disponible dans:</p>
    156. 

  156. <blockquote>
    157. 

  157. <p>/usr/share/doc/opendkim/examples</p>
    158. 

  158. </blockquote>
    159. 

  159. <p>  Voici notre fichier de configuration; adaptez-le en fonction de votre domaine, bien s&#xFB;r:</p>
    160. 

  160. <pre><code class="language-shell"># This is a basic configuration that can easily be adapted to suit a standard
    161. 

  161. # installation. For more advanced options, see opendkim.conf(5) and/or
    162. 

  162. # /usr/share/doc/opendkim/examples/opendkim.conf.sample.
    163. 

  163. 

  164. # Log to syslog
    165. 

  165. Syslog                       yes
    166. 

  166. # Required to use local socket with MTAs that access the socket as a non-
    167. 

  167. # privileged user (e.g. Postfix)
    168. 

  168. ## UMask                        002
    169. 

  169. 

  170. # Sign for example.com with key in /etc/mail/dkim.key using
    171. 

  171. # selector &apos;2007&apos; (e.g. 2007._domainkey.example.com)
    172. 

  172. Domain                  yojik.net
    173. 

  173. KeyFile         /etc/opendkim/keys/yojik.net/yojik.private
    174. 

  174. Selector                yojik
    175. 

  175. 

  176. # Commonly-used options; the commented-out versions show the defaults.
    177. 

  177. #Canonicalization       simple
    178. 

  178. #Mode                   sv
    179. 

  179. #SubDomains             no
    180. 

  180. #ADSPAction            continue
    181. 

  181. 

  182. # Always oversign From (sign using actual From and a null From to prevent
    183. 

  183. # malicious signatures header fields (From and/or others) between the signer
    184. 

  184. # and the verifier.  From is oversigned by default in the Debian pacakge
    185. 

  185. # because it is often the identity key used by reputation systems and thus
    186. 

  186. # somewhat security sensitive.
    187. 

  187. OversignHeaders         From
    188. 

  188. 

  189. # List domains to use for RFC 6541 DKIM Authorized Third-Party Signatures
    190. 

  190. # (ATPS) (experimental)
    191. 

  191. 

  192. #ATPSDomains            example.com
    193. 

  193. 

  194. AutoRestart             Yes
    195. 

  195. AutoRestartRate         10/1h
    196. 

  196. UMask                   002
    197. 

  197. Syslog                  yes
    198. 

  198. SyslogSuccess           Yes
    199. 

  199. LogWhy                  Yes
    200. 

  200. Canonicalization        relaxed/simple
    201. 

  201. 

  202. ExternalIgnoreList      refile:/etc/opendkim/TrustedHosts
    203. 

  203. InternalHosts           refile:/etc/opendkim/TrustedHosts
    204. 

  204. KeyTable                refile:/etc/opendkim/KeyTable
    205. 

  205. SigningTable            refile:/etc/opendkim/SigningTable
    206. 

  206. 

  207. Mode                    sv
    208. 

  208. PidFile                 /var/run/opendkim/opendkim.pid
    209. 

  209. SignatureAlgorithm      rsa-sha256
    210. 

  210. 

  211. UserID                  opendkim:opendkim
    212. 

  212. 

  213. Socket                  inet:12301@localhost</code></pre>
    214. 

  214. <p>  Postix acc&#xE9;dera &#xE0; opendkim &#xE0; travers le port 12301.</p>
    215. 

  215. <p>  Il nous reste 3 fichiers &#xE0; configurer/cr&#xE9;er, ainsi que g&#xE9;n&#xE9;rer les clefs priv&#xE9;es et publiques.</p>
    216. 

  216. <ul>
    217. 

  217. <li><p>/etc/opendkim/SigningTable</p>
    218. 

  218. <p> Ce fichier ne contient qu&apos;une seule ligne:</p>
    219. 

  219. <blockquote>
    220. 

  220. <p><a href="mailto:*@yojik.net">*@yojik.net</a> yojik._domainkey.yojik.net</p>
    221. 

  221. </blockquote>
    222. 

  222. </li>
    223. 

  223. <li><p>/etc/opendkim/KeyTable</p>
    224. 

  224. <p> Ce fichier ne contient qu&apos;une seule ligne:</p>
    225. 

  225. <blockquote>
    226. 

  226. <p>yojik._domainkey.yojik.net yojik.net:yojik:/etc/opendkim/keys/yojik.net/yojik.private</p>
    227. 

  227. </blockquote>
    228. 

  228. </li>
    229. 

  229. <li><p>/etc/opendkim/TrustedHosts</p>
    230. 

  230. <blockquote>
    231. 

  231. <p>127.0.0.1</p>
    232. 

  232. </blockquote>
    233. 

  233. <blockquote>
    234. 

  234. <p>::1</p>
    235. 

  235. </blockquote>
    236. 

  236. <blockquote>
    237. 

  237. <p>localhost</p>
    238. 

  238. </blockquote>
    239. 

  239. <blockquote>
    240. 

  240. <p>yojik.net</p>
    241. 

  241. </blockquote>
    242. 

  242. <p> Ne pas modifier les 3 premi&#xE8;res lignes qui sont n&#xE9;cessaires &#xE0; opendkim ...</p>
    243. 

  243. </li>
    244. 

  244. <li><p>Cr&#xE9;ation des clefs publiques et priv&#xE9;es</p>
    245. 

  245. <blockquote>
    246. 

  246. <p>cd /etc/opendkim/keys/yojik.net/</p>
    247. 

  247. </blockquote>
    248. 

  248. <blockquote>
    249. 

  249. <p>opendkim-genkey -b 2048 -h rsa-sha256 -r -s yojik -d yojik.net -v</p>
    250. 

  250. </blockquote>
    251. 

  251. <p> Une erreur appara&#xEE;t: il nous faut installer opendkim-tools:</p>
    252. 

  252. <blockquote>
    253. 

  253. <p>apt install opendkim-tools</p>
    254. 

  254. </blockquote>
    255. 

  255. <p> 2 fichiers sont cr&#xE9;es: la clef publique et la clef priv&#xE9;e. Nous allons renommer ces 2 clefs.</p>
    256. 

  256. <blockquote>
    257. 

  257. <p>mv mv 201805.private yojik.private</p>
    258. 

  258. </blockquote>
    259. 

  259. <blockquote>
    260. 

  260. <p>mv 201805.txt yojik.txt</p>
    261. 

  261. </blockquote>
    262. 

  262. <p> Note du 9 d&#xE9;cembre 2018: les fichiers sont cr&#xE9;es avec les noms corrects; pas besoin de les renommer.
    263. 

  263.  On r&#xE9;applique la modification des permissions:</p>
    264. 

  264. </li>
    265. 

  265. </ul>
    266. 

  266. <pre><code class="language-shell">root@atom:/etc/opendkim/keys# cd /etc
    267. 

  267. root@atom:/etc# chown -R opendkim:opendkim /etc/opendkim
    268. 

  268. root@atom:/etc# chmod -R go-rw /etc/opendkim/keys
    269. 

  269. root@atom:/etc#</code></pre>
    270. 

  270. <p>  On relance opendkim pour voir s&apos;il y a des erreurs:</p>
    271. 

  271. <blockquote>
    272. 

  272. <p>systemctl restart opendkim</p>
    273. 

  273. </blockquote>
    274. 

  274. <p>  On lance:</p>
    275. 

  275. <blockquote>
    276. 

  276. <p>netstat -tlnp</p>
    277. 

  277. </blockquote>
    278. 

  278. <p>  et on voit la ligne:</p>
    279. 

  279. <blockquote>
    280. 

  280. <p>tcp        0      0 127.0.0.1:12301         0.0.0.0:*               LISTEN      2395/opendkim</p>
    281. 

  281. </blockquote>
    282. 

  282. <p>  C&apos;est bon .. le service est en place.</p>
    283. 

  283. <h3 id="ajout-de-dkim-postix">Ajout de DKIM &#xE0; Postix</h3>
    284. 

  284. <p>   On va rajouter la gestion de DKIM &#xE0; Postfix dans le fichier /etc/postfix/main.cf</p>
    285. 

  285. <p>   On ajoute les lignes suivantes:</p>
    286. 

  286. <blockquote>
    287. 

  287. <p>milter_default_action = accept</p>
    288. 

  288. </blockquote>
    289. 

  289. <blockquote>
    290. 

  290. <p>milter_protocol = 2</p>
    291. 

  291. </blockquote>
    292. 

  292. <blockquote>
    293. 

  293. <p>smtpd_milters = inet:localhost:12301</p>
    294. 

  294. </blockquote>
    295. 

  295. <blockquote>
    296. 

  296. <p>non_smtpd_milters = inet:localhost:12301</p>
    297. 

  297. </blockquote>
    298. 

  298. <p>   On relance Postfix par:</p>
    299. 

  299. <blockquote>
    300. 

  300. <p>service postfix restart</p>
    301. 

  301. </blockquote>
    302. 

  302. <h3 id="ajout-d-un-enregistrement-dns">Ajout d&apos;un enregistrement DNS</h3>
    303. 

  303. <p>   On ajoute la partie entre double-quotes du fichier /etc/opendkim/keys/yojik.net/yojik.txt &#xE0; la ligne suivante:</p>
    304. 

  304. <p>   Attention &#xE0; la syntaxe: ne pas oublier le &quot;.&quot; derri&#xE8;re yojik.net!</p>
    305. 

  305. <blockquote>
    306. 

  306. <p>yojik._domainkey.yojik.net.&lt;&gt;IN&lt;-&gt;TXT&lt;&gt;( &quot;v=DKIM1; h=rsa-sha256; k=rsa; s=email; p=;&quot;)</p>
    307. 

  307. </blockquote>
    308. 

  308. <p>   Ajouter la clef derri&#xE8;re p= (supprimer les doubles quotes du d&#xE9;but, milieu et fin de clef: ex:
    309. 

  309.      &quot;ljjoj&quot; &quot;dfjj&quot;)</p>
    310. 

  310. <h3 id="test">Test</h3>
    311. 

  311. <pre><code>&gt; opendkim-testkey -d yojik.net -s yojik</code></pre><p>   Si votre clef est de longueur 2048, il va falloir la d&#xE9;couper ... et utiliser le format &quot;multi-lignes&quot; comme ce qui suit:</p>
    312. 

  312. <h3 id="notes">Notes</h3>
    313. 

  313. <ul>
    314. 

  314. <li>Une chose &#xE0; v&#xE9;rifier: le point &quot;.&quot; &#xE0; la fin du nom de domaine (premi&#xE8;re partie de la ligne). Les messages d&apos;erreur style &quot;erreur de syntaxe&quot; n&apos;aident pas beaucoup ...</li>
    315. 

  315. </ul>
    316. 

  316. <p>Cette fois-ci, tout est bon.</p>
    317. 

  317. <ul>
    318. 

  318. <li>J&apos;ai adopt&#xE9; une technique pour coller ma clef dans l&apos;enregistrement dns: je fais un:</li>
    319. 

  319. </ul>
    320. 

  320. <blockquote>
    321. 

  321. <p>cat fichier_de_zone fichier_de_clef &gt; fichier_de_zone.new</p>
    322. 

  322. </blockquote>
    323. 

  323. <p>J&apos;&#xE9;dite le fichier (les retours-chariot etc ...) et je remplace le fichier original (que je sauve d&apos;abord) en incr&#xE9;mentant le numero de s&#xE9;rie dans le fichier.</p>
    324. 

  324. <h3 id="test">Test</h3>
    325. 

  325. <p>   On envoie un message pour voir s&apos;il est bien sign&#xE9;.</p>
    326. 

  326. <p>   Je red&#xE9;marre le serveur et j&apos;envoie un message.</p>
    327. 

  327. <p>   Voil&#xE0; les r&#xE9;sultats:</p>
    328. 

  328. <pre><code class="language-shell">&gt; ARC-Authentication-Results: i=1; mx.google.com;
    329. 

  329. &gt;        dkim=pass header.i=@yojik.net header.s=yojik header.b=CE0b13ii;
    330. 

  330. &gt;        spf=pass (google.com: domain of ericadmin@yojik.net designates 82.64.48.5 as permitted sender)     &gt; smtp.mailfrom=ericadmin@yojik.net
    331. 

  331. &gt; Received-SPF: pass (google.com: domain of ericadmin@yojik.net designates 82.64.48.5 as permitted sender)    &gt; client-ip=82.64.48.5;
    332. 

  332. &gt; Authentication-Results: mx.google.com;
    333. 

  333. &gt;        dkim=pass header.i=@yojik.net header.s=yojik header.b=CE0b13ii;
    334. 

  334. &gt;        spf=pass (google.com: domain of ericadmin@yojik.net designates 82.64.48.5 as permitted sender)     &gt; smtp.mailfrom=ericadmin@yojik.net
    335. 

  335. &gt; Received: from [192.168.111.150] (unknown [192.168.111.150])
    336. 

  336. &gt;     by atom.yojik.net (Postfix) with ESMTPSA id AFB9ED004F3
    337. 

  337. &gt;     for &lt;ericounet26200@gmail.com&gt;; Thu, 31 May 2018 12:09:41 +0200 (CEST)
    338. 

  338. &gt; DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=yojik.net; s=yojik;
    339. 

  339. &gt;     t=1527761381; bh=ay9Odp/rKTenfDlpDmHqBM+YFfCITM3u/keXU6iwx20=;
    340. 

  340. &gt;     h=To:From:Subject:Date:From;
    341. 

  341. &gt;     b=CE0b13iiZgEQgrd7EngBovulGeU6QnSU/cKzia42u9s9B+S/dxUsm1u7JRjBrTLLg
    342. 

  342. &gt;      /c/uW05pdE5QS+9y3dvZtji0hogr0H87nRpZE7QBZaFLpVWGpUTukRsJ47JskO+Cwi
    343. 

  343. &gt;      4cRYjeyUOLTY8Gc8uQaiS79CDko8E107fsfoUGV8=</code></pre>
    344. 

  344. <p>  Tout est bon ....</p>
    345. 

  345. <p>  <strong>IL est recommand&#xE9; de changer les clefs DKIM tous les mois!</strong> ... Je pense qu&apos;il va falloir cr&#xE9;er des scripts pour toute la maintenance des clefs et de leur renouvellement.</p>
    346. 

  346. <h2 id="adsp">ADSP</h2>
    347. 

  347. <p>  Author Domain Signing Practices (ADSP)Permalink (technique obsol&#xE8;te ...)</p>
    348. 

  348. <p>  Nous allons rajouter un enregistrement DNS qui va indiquer que tous les &#xE9;mails issus par yojik.net doivent &#xEA;tre sign&#xE9;s par DKIM. C&apos;est une s&#xE9;curit&#xE9; suppl&#xE9;mentaire.</p>
    349. 

  349. <p>  La syntaxe est assez simple:</p>
    350. 

  350. <blockquote>
    351. 

  351. <p><em>adsp.</em>domainkey.yojik.net.      IN      TXT     &quot;dkim=all&quot;</p>
    352. 

  352. </blockquote>
    353. 

  353. <ul>
    354. 

  354. <li>Le param&#xE8;tre dkim accepte d&apos;autres valeurs moins strictes, mais j&apos;ai choisi la plus stricte.</li>
    355. 

  355. <li>Ne pas oublier d&apos;incr&#xE9;menter le num&#xE9;ro de s&#xE9;rie du fichier de zone apr&#xE8;s modification.</li>
    356. 

  356. <li><p>Rechargez bind.</p>
    357. 

  357. <blockquote>
    358. 

  358. <p>service bind9 restart (ou reload)</p>
    359. 

  359. </blockquote>
    360. 

  360. <p>Tout est OK.</p>
    361. 

  361. <p>Note: ADSP et Dmarc remplissent le m&#xEA;me r&#xF4;le. Apr&#xE8;s consultation d&apos;experts, ADSP est &quot;obsol&#xE8;te&quot;. Nous allons donc enlever ce service (commenter la ligne DNS) et configurer DMARC.</p>
    362. 

  362. </li>
    363. 

  363. </ul>
    364. 

  364. <h2 id="dmarc">DMARC</h2>
    365. 

  365. <p>Dmarc (Domain Message Authentication, Reporting &amp; Conformance) pr&#xE9;cise les politiques d&apos;envoi des messages issus du domaine concern&#xE9; (gr&#xE2;ce &#xE0; DKIM et SPF), indique quelle politique utiliser si les conditions ne sont pas respect&#xE9;es (validations SPF ou DKIM , et peut &#xE9;ventuellement demander un rapport en cas d&apos;&#xE9;chec de livraison du message.</p>
    366. 

  366. <p>La mise en place de DMARC n&#xE9;cessite de configurer/installer opendmarc, de mettre en place l&apos;enregistrement TXT dans le fichier de zone DNS et de configurer le <strong>hook</strong> dans Postfix.</p>
    367. 

  367. <h3 id="installation-de-opendmarc">Installation de Opendmarc</h3>
    368. 

  368. <pre><code>root@atom:/home/ericadmin# apt install opendmarc
    369. 

  369. Lecture des listes de paquets... Fait
    370. 

  370. Construction de l&apos;arbre des d&#xE9;pendances
    371. 

  371. Lecture des informations d&apos;&#xE9;tat... Fait
    372. 

  372. The following additional packages will be installed:
    373. 

  373.   libdbd-mysql-perl libdbi-perl libencode-locale-perl libhttp-date-perl libhttp-message-perl libio-html-perl liblwp-mediatypes-perl libopendbx1-mysql libopendmarc2
    374. 

  374.   libspf2-2 libtimedate-perl liburi-perl publicsuffix
    375. 

  375. etc ...
    376. 

  376. 

  377. Param&#xE9;trage de libdbd-mysql-perl (4.041-2) ...
    378. 

  378. Param&#xE9;trage de opendmarc (1.3.2-2+deb9u1) ...
    379. 

  379. Traitement des actions diff&#xE9;r&#xE9;es (&#xAB; triggers &#xBB;) pour libc-bin (2.24-11+deb9u3) ...
    380. 

  380. Traitement des actions diff&#xE9;r&#xE9;es (&#xAB; triggers &#xBB;) pour systemd (232-25+deb9u3) ...</code></pre><p>Voil&#xE0;, opendmarc est install&#xE9;. Passons &#xE0; sa configuration.</p>
    381. 

  381. <h3 id="configuration-de-opendmarc">Configuration de Opendmarc</h3>
    382. 

  382. <p>2 fichiers sont &#xE0; configurer.</p>
    383. 

  383. <p>La configuration se fait dans /etc/opendmarc.conf et dans /etc/default/opendmarc:</p>
    384. 

  384. <p>Comme d&apos;habitude, faite une copie de sauvegarde du fichier d&apos;origine avant modification.</p>
    385. 

  385. <p><strong>Fichier /etc/opendmarc.conf</strong>:</p>
    386. 

  386. <pre><code class="language-shell"># This is a basic configuration that can easily be adapted to suit a standard
    387. 

  387. # installation. For more advanced options, see opendkim.conf(5) and/or
    388. 

  388. # /usr/share/doc/opendmarc/examples/opendmarc.conf.sample.
    389. 

  389. 

  390. ##  AuthservID (string)
    391. 

  391. ##  &lt;--&gt;defaults to MTA name
    392. 

  392. #
    393. 

  393. # AuthservID name
    394. 

  394. 

  395. ##  FailureReports { true | false }
    396. 

  396. ##  &lt;--&gt;default &quot;false&quot;
    397. 

  397. ##
    398. 

  398. # FailureReports false
    399. 

  399. 

  400. PidFile /var/run/opendmarc/opendmarc.pid
    401. 

  401. 

  402. ##  RejectFailures { true | false }
    403. 

  403. ##  &lt;--&gt;default &quot;false&quot;
    404. 

  404. ##
    405. 

  405. RejectFailures false
    406. 

  406. 

  407. ##  Socket socketspec
    408. 

  408. ##  &lt;--&gt;default (none)
    409. 

  409. ##
    410. 

  410. ##  Specifies the socket that should be established by the filter to receive
    411. 

  411. ##  connections from sendmail(8) in order to provide service.  socketspec is
    412. 

  412. ##  in one of two forms: local:path, which creates a UNIX domain socket at
    413. 

  413. ##  the specified path, or inet:port[@host] or inet6:port[@host] which creates
    414. 

  414. ##  a TCP socket on the specified port for the appropriate protocol family.
    415. 

  415. ##  If the host is not given as either a hostname or an IP address, the
    416. 

  416. ##  socket will be listening on all interfaces.  This option is mandatory
    417. 

  417. ##  either in the configuration file or on the command line.  If an IP
    418. 

  418. ##  address is used, it must be enclosed in square brackets.
    419. 

  419. #
    420. 

  420. # Socket local:/var/run/opendmarc/opendmarc.sock
    421. 

  421. Socket inet:54444@localhost
    422. 

  422. 

  423. ##  Syslog { true | false }
    424. 

  424. ##  &lt;--&gt;default &quot;false&quot;
    425. 

  425. ##
    426. 

  426. ##  Log via calls to syslog(3) any interesting activity.
    427. 

  427. #
    428. 

  428. Syslog true
    429. 

  429. 

  430. ##  SyslogFacility facility-name
    431. 

  431. ##  &lt;--&gt;default &quot;mail&quot;
    432. 

  432. ##
    433. 

  433. ##  Log via calls to syslog(3) using the named facility.  The facility names
    434. 

  434. ##  are the same as the ones allowed in syslog.conf(5).
    435. 

  435. #
    436. 

  436. # SyslogFacility mail
    437. 

  437. 

  438. ##  TrustedAuthservIDs string
    439. 

  439. ##  &lt;--&gt;default HOSTNAME
    440. 

  440. ##
    441. 

  441. ##  Specifies one or more &quot;authserv-id&quot; values to trust as relaying true
    442. 

  442. ##  upstream DKIM and SPF results.  The default is to use the name of
    443. 

  443. ##  the MTA processing the message.  To specify a list, separate each entry
    444. 

  444. ##  with a comma.  The key word &quot;HOSTNAME&quot; will be replaced by the name of
    445. 

  445. ##  the host running the filter as reported by the gethostname(3) function.
    446. 

  446. #
    447. 

  447. # TrustedAuthservIDs HOSTNAME
    448. 

  448. 

  449. 

  450. ##  UMask mask
    451. 

  451. ##  &lt;--&gt;default (none)
    452. 

  452. ##
    453. 

  453. ##  Requests a specific permissions mask to be used for file creation.  This
    454. 

  454. ##  only really applies to creation of the socket when Socket specifies a
    455. 

  455. ##  UNIX domain socket, and to the HistoryFile and PidFile (if any); temporary
    456. 

  456. ##  files are normally created by the mkstemp(3) function that enforces a
    457. 

  457. ##  specific file mode on creation regardless of the process umask.  See
    458. 

  458. ##  umask(2) for more information.
    459. 

  459. #
    460. 

  460. UMask 0002
    461. 

  461. 

  462. ##  UserID user[:group]
    463. 

  463. ##  &lt;--&gt;default (none)
    464. 

  464. ##
    465. 

  465. ##  Attempts to become the specified userid before starting operations.
    466. 

  466. ##  The process will be assigned all of the groups and primary group ID of
    467. 

  467. ##  the named userid unless an alternate group is specified.
    468. 

  468. #
    469. 

  469. UserID opendmarc
    470. 

  470. 

  471. ## Path to system copy of PSL (needed to determine organizational domain)
    472. 

  472. #
    473. 

  473. PublicSuffixList /usr/share/publicsuffix/
    474. 

  474. 

  475. IgnoreHosts /etc/opendmarc/ignore.hosts
    476. 

  476. HistoryFile /var/run/opendmarc/opendmarc.dat
    477. 

  477. #for testing:
    478. 

  478. SoftwareHeader true</code></pre>
    479. 

  479. <p>On cr&#xE9;e le r&#xE9;pertoire suivant: /etc/opendmarc et on cr&#xE9;e un fichier qui va contenir la liste des machines auxquelles vous avez confiance.</p>
    480. 

  480. <pre><code class="language-shell">root@atom:/etc# mkdir /etc/opendmarc</code></pre>
    481. 

  481. <p>On cr&#xE9;e le fichier <strong>/etc/opendmarc/ignore.hosts</strong> avec le contenu suivant (le fichier ignore.hosts a &#xE9;t&#xE9; d&#xE9;clar&#xE9; dans le fichier /etc/opendmarc.conf):</p>
    482. 

  482. <blockquote>
    483. 

  483. <p>localhost
    484. 

  484. 192.168.111.0/24</p>
    485. 

  485. </blockquote>
    486. 

  486. <p>Les mails envoy&#xE9;s par les machines list&#xE9;es dans ce fichier ne seront pas test&#xE9;s. Ici, le serveur de mail lui-m&#xEA;me et les machines du r&#xE9;seau local familial.</p>
    487. 

  487. <p>On ajoute la ligne suivante &#xE0; /etc/default/opendmarc:</p>
    488. 

  488. <blockquote>
    489. 

  489. <p>SOCKET=inet:54444@localhost</p>
    490. 

  490. </blockquote>
    491. 

  491. <p>Notre daemon &#xE9;coutera sur le port 54444. On relance opendmarc par la commande suivante:</p>
    492. 

  492. <blockquote>
    493. 

  493. <p>service opendmarc restart</p>
    494. 

  494. </blockquote>
    495. 

  495. <p>Mise en place du hook dans postfix:</p>
    496. 

  496. <p>Nous modifierons les 2 lignes suivantes dans le fichier: /etc/postfix/main.cf:</p>
    497. 

  497. <blockquote>
    498. 

  498. <p>smtpd_milters = inet:localhost:12301,inet:localhost:54444
    499. 

  499. non_smtpd_milters = inet:localhost:12301,inet:localhost:54444</p>
    500. 

  500. </blockquote>
    501. 

  501. <p>On recharge postfix (comme d&apos;habitude ...)
    502. 

  502. Configuration de l&apos;enregistrement DNS dans le fichier de zone (ne pas oublier d&apos;incr&#xE9;menter le compteur!):</p>
    503. 

  503. <blockquote>
    504. 

  504. <p>_dmarc.yojik.net.   TXT ( &quot;v=DMARC1; p=none; sp=reject; pct=10; adkim=r;aspf=r;fo=1;ri=86400;rua=mailto:<a href="mailto:ericadmin@yojik.net">ericadmin@yojik.net</a>&quot;)</p>
    505. 

  505. </blockquote>
    506. 

  506. <p>Test d&apos;envoi de messages:</p>
    507. 

  507. <blockquote>
    508. 

  508. <p>Authentication-Results: atom.yojik.net; dmarc=<strong>pass</strong></p>
    509. 

  509. </blockquote>
    510. 

  510. <p>&#xC7;a fonctionne :)</p>
    511. 

  511. <pre><code></code></pre></article></div><div style="background-color: #b4b2b2;width: 50px;height:50px;line-height: 50px;text-align: center;position: fixed;bottom: 10px;right: 10px;padding-top:5px;" onclick="document.documentElement.scrollTop = document.body.scrollTop =0;">
    512. 

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    513. 

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    514. 

  514. </div>
    515. 

  515. </body></html>
    516.