{"id":4175,"date":"2020-10-30T20:02:00","date_gmt":"2020-10-30T19:02:00","guid":{"rendered":"https:\/\/webhosting.de\/postfix-certificate-verification-failed-for-gmail-smtp-in-l-google-com\/"},"modified":"2021-07-15T13:06:04","modified_gmt":"2021-07-15T12:06:04","slug":"postfix-certificate-verification-failed-for-gmail-smtp-in-l-google-com","status":"publish","type":"post","link":"https:\/\/webhosting.de\/sv\/postfix-certificate-verification-failed-for-gmail-smtp-in-l-google-com\/","title":{"rendered":"postfix: utg\u00e5ende e-post skickas krypterat."},"content":{"rendered":"

Det \u00e4r alltid klokt att kryptera e-postkommunikationen, s\u00e4rskilt om du ocks\u00e5 \u00e4r mobil p\u00e5 v\u00e4gen och i wlan-milj\u00f6er h\u00e4mtar eller skriver e-postmeddelanden. Eftersom det h\u00e4r vanligtvis lurar en ok\u00e4nd person, \u00e4r kommunikationen i klartext.<\/p>\n

Med enkla inst\u00e4llningar i e-postprogrammet eller smarttelefonen kan du aktivera den krypterade anslutningen. P\u00e5 s\u00e5 s\u00e4tt \u00e4r anslutningen fr\u00e5n e-postprogrammet till e-postservern krypterad och s\u00e4ker.<\/p>\n

Anslutningarna mellan avs\u00e4ndarens och mottagarens e-postservrar \u00e4r dock problematiska. Dessa \u00f6verf\u00f6rs vanligtvis okrypterade, eftersom de befinner sig i en s\u00e4ker milj\u00f6. Det \u00e4r dock naturligtvis m\u00f6jligt att kopiera och tjuvlyssna p\u00e5 e-posttrafiken.<\/p>\n

Man b\u00f6r ge sitt Postfix<\/a> e-postservern b\u00f6r \u00e5tminstone kunna skicka Uppgifter<\/a> krypterad n\u00e4r det \u00e4r m\u00f6jligt.<\/p>\n

Om du hittar poster i din maillog som:<\/p>\n

Certifikatverifiering misslyckades f\u00f6r gmail-smtp-in.l.google.com<\/h2>\n

D\u00e5 kan ditt postfix inte l\u00e4sa den Certifikat<\/a> att kontrollera f\u00f6r att kryptera uppgifterna.<\/p>\n

Med en liten \u00e4ndring i filen main.cf kan du aktivera detta.<\/p>\n

F\u00f6r detta m\u00e5ste ca-certifikaten installeras p\u00e5 servern. F\u00f6r redhat eller centos finns detta i paketet ca-certificates.
\nDe paketerade filerna finns h\u00e4r: \/etc\/pki\/ca-trust\/extracted\/pem\/tls-ca-bundle.pem p\u00e5 centos7. Du b\u00f6r ha ditt eget certifikat och sedan lagra det i \/etc\/postfix\/postfix_default.pem tillsammans med nyckeln och root crt.<\/p>\n

Ange nu dessa kommandon:<\/p>\n

\npostconf -e smtp_tls_security_level=may\npostconf -e smtp_tls_cert_file=\/etc\/postfix\/postfix_default.pem\npostconf -e smtp_tls_key_file=\/etc\/postfix\/postfix_default.pem\npostconf -e smtp_tls_CAfile = \/etc\/pki\/ca-trust\/extracted\/pem\/tls-ca-bundle.pem\npostconf -e smtp_tls_mandatory_exclude_ciphers='aNULL, DES, RC4, MD5'\n\npostconf -e smtpd_tls_security_level=may\npostconf -e smtpd_tls_key_file=\/etc\/postfix\/postfix_default.pem\npostconf -e smtpd_tls_cert_file=\/etc\/postfix\/postfix_default.pem\npostconf -e smtpd_tls_mandatory_protocols='!SSLv2, !SSLv3'\npostconf -e smtpd_tls_protocols='!SSLv2, !SSLv3'\npostconf -e smtpd_tls_mandatory_ciphers=high\npostconf -e smtpd_tls_mandatory_exclude_ciphers='aNULL, DES, RC4, MD5'\npostconf -e tls_high_cipherlist='EDH+CAMELLIA:EDH+aRSA:EECDH+aRSA+AESGCM:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH:+CAMELLIA256:+AES256:+CAMELLIA128:+AES128:+SSLv3:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!DSS:!RC4:!SEED:!ECDSA:CAMELLIA256-SHA:AES256-SHA:CAMELLIA128-SHA:AES128-SHA\n<\/pre>\n
Fr\u00e5n och med nu krypterar postfix till andra servrar som erbjuder detta.<\/p>\n
Se dock till att alternativen \u00e4r l\u00e4mpliga: <\/p>\n
Detta alternativ marknadsf\u00f6rs av vissa leverant\u00f6rer i TV-reklam som en s\u00e4ker e-postf\u00f6rs\u00e4ndelse. Observera att det naturligtvis bara \u00e4r en transportkryptering, dvs. v\u00e4gen mellan de tv\u00e5 e-postservrarna. Sj\u00e4lva e-postmeddelandet lagras \u00e5terigen i klartext p\u00e5 mottagarens e-postserver.<\/p>","protected":false},"excerpt":{"rendered":"
Es ist immer sinnvoll die eMail Kommunikation zu verschl\u00fcsseln, gerade wenn man auch mobil unterwegs ist und in wlan Umgebungen eMails abruft oder schreibt. Denn hier lauert meist ein unbekannter, der die Kommunikation im Klartext mitschneidet. Mit simplen Einstellungen im eMailprogramm oder Smartphone kann man die Verschl\u00fcsselte Verbindung aktivieren. Somit ist die Verbindung vom eMailprogramm 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