Centos

即使我在 Cyber panel 中發布了郵件伺服器 SSL，IMAP 和 SMTP 仍然使用自簽名 SSL

  • August 24, 2021

我在 CentOS 7 上使用了cyberpanel，並為我的 postfix 和 dovecot 設置了 SSL。但是即使我使用 Lets Encrypt 配置了 SSL，我仍然得到“SSL 無效”導致自簽名 SSL。

這是 /etc/postfix/main.cf

smtpd_tls_cert_file = /etc/letsencrypt/live/mail.domain.net/fullchain.pem
smtpd_tls_key_file = /etc/letsencrypt/live/mail.domain.net/privkey.pem

這是 /etc/dovecot/dovecot.conf

ssl_cert = </etc/letsencrypt/live/mail.domain.net/fullchain.pem
ssl_key = </etc/letsencrypt/live/mail.domain.net/privkey.pem
....
local_name mail.domain.net {
       ssl_cert = </etc/letsencrypt/live/mail.domain.net/fullchain.pem
       ssl_key = </etc/letsencrypt/live/mail.domain.net/privkey.pem
}

local_name mail.sub.domain.net {
       ssl_cert = </etc/letsencrypt/live/mail.sub.domain.net/fullchain.pem
       ssl_key = </etc/letsencrypt/live/mail.sub.domain.net/privkey.pem
}

這是 /etc/dovecot/conf.d/10-ssl.conf

ssl = required
ssl_cert = </etc/letsencrypt/live/mail.domain.net/fullchain.pem
ssl_key = </etc/letsencrypt/live/mail.domain.net/privkey.pem

所有文件都指向正確的 SSL 文件。但是，當我嘗試使用 SSL 登錄 IMAP 和 SMTP 時，出現錯誤：SSL 無效導致自簽名證書www.example.com（不是 mail.domain.net）。

當我使用命令檢查時： openssl s_client -servername mail.domain.net -connect mail.domain.net:993

CONNECTED(00000003)
depth=0 C = US, ST = Denial, L = Springfield, O = Dis, CN = www.example.com
verify error:num=18:self signed certificate
verify return:1
depth=0 C = US, ST = Denial, L = Springfield, O = Dis, CN = www.example.com
verify return:1
---
Certificate chain
0 s:/C=US/ST=Denial/L=Springfield/O=Dis/CN=www.example.com
  i:/C=US/ST=Denial/L=Springfield/O=Dis/CN=www.example.com
---
Server certificate
-----BEGIN CERTIFICATE-----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=
-----END CERTIFICATE-----
subject=/C=US/ST=Denial/L=Springfield/O=Dis/CN=www.example.com
issuer=/C=US/ST=Denial/L=Springfield/O=Dis/CN=www.example.com
---
No client certificate CA names sent
Peer signing digest: SHA512
Server Temp Key: ECDH, P-256, 256 bits
---
SSL handshake has read 1590 bytes and written 441 bytes
---
New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES256-GCM-SHA384
Server public key is 2048 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
   Protocol  : TLSv1.2
   Cipher    : ECDHE-RSA-AES256-GCM-SHA384
   Session-ID: 88F2CCFDE63FE391E9824F596E0C8300E44CB306F969E2A1C0AFE3B75E5A4D74
   Session-ID-ctx: 
   Master-Key: E22198E25F15AA193B9E73446CB934276DF90987DFC75B1B74DDAF3247CA8436CDB93B3274102188B3470DF1A4EFB0D1
   Key-Arg   : None
   Krb5 Principal: None
   PSK identity: None
   PSK identity hint: None
   TLS session ticket lifetime hint: 300 (seconds)
   TLS session ticket:
   0000 - e6 78 ae 14 e1 04 0d b4-64 82 65 9e 14 ad 32 9c   .x......d.e...2.
   0010 - f3 f0 c2 fd f9 12 5b bf-0f 50 75 79 64 5c bb ba   ......[..Puyd\..
   0020 - 31 f6 37 bd 1c b2 e7 dc-d9 02 c7 53 f4 f9 0c a6   1.7........S....
   0030 - d4 51 6a 60 6b 34 04 41-fd b3 7d 53 14 ff 1d b4   .Qj`k4.A..}S....
   0040 - a2 82 67 6e da d7 80 02-b0 9f 6d 82 b4 17 72 cf   ..gn......m...r.
   0050 - 30 05 54 fc 8c be 60 6d-e5 0f b8 25 04 f3 43 6d   0.T...`m...%..Cm
   0060 - 7e 13 f1 85 02 03 90 a2-50 82 64 43 aa 79 b8 ee   ~.......P.dC.y..
   0070 - 86 08 ef 7a ac 4b c7 86-57 bc 09 a4 9a bb 23 92   ...z.K..W.....#.
   0080 - cb 18 74 a4 90 c5 b1 8b-39 3c cc 69 ee e8 fb 08   ..t.....9<.i....
   0090 - 60 93 ea 17 35 d5 58 0d-ee 1b 68 c2 98 d0 e9 9c   `...5.X...h.....
   00a0 - f5 a7 24 9b 29 0a 48 6b-70 f8 a5 9a 7c e5 e8 88   ..$.).Hkp...|...

   Start Time: 1624855926
   Timeout   : 300 (sec)
   Verify return code: 18 (self signed certificate)
---
+OK Dovecot ready.

這是登錄郵件伺服器。systemctl 狀態後綴 -l

230, TLS handshaking: SSL_accept() failed: error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown: SSL alert number 46, session=<RLYR5sLFeh62/Xx7>
Jun 28 00:42:37 mail-domain-net dovecot[574952]: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=182.253.XXX.XXX, lip=10.5.224.230, TLS handshaking: SSL_accept() failed: error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown: SSL alert number 46, session=<WF4U5sLFlym2/Xx7>
Jun 28 00:42:38 mail-domain-net dovecot[574952]: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=182.253.XXX.XXX, lip=10.5.224.230, TLS handshaking: SSL_accept() failed: error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown: SSL alert number 46, session=<nasX5sLFoim2/Xx7>
Jun 28 00:42:38 mail-domain-net dovecot[574952]: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=182.253.XXX.XXX, lip=10.5.224.230, TLS handshaking: SSL_accept() failed: error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown: SSL alert number 46, session=<BFYY5sLFrCm2/Xx7>
Jun 28 00:42:38 mail-domain-net dovecot[574952]: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=182.253.XXX.XXX, lip=10.5.224.230, TLS handshaking: SSL_accept() failed: error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown: SSL alert number 46, session=<YQkZ5sLFrSm2/Xx7>

請幫助我，我應該檢查哪個文件或配置。

我通過執行以下操作解決了這個問題：

1. 配置 PTR 記錄 我請求伺服器提供商為我的 IP 地址添加 PTR 記錄。因此，當您查找 IP 時，它將返回：

$ nslookup 116.193.250.253                                                                                                                   130 ⨯
253.250.193.116.in-addr.arpa    name = mail.yourprimarymailserverdomain.com.
253.250.193.116.in-addr.arpa    name = mail.yoursecondarymailserverdomain.com.

好的，我為我的電子郵件伺服器使用了兩個域。如果您仍然獲得自簽名 SSL，請轉到第二步。

2. 手動配置 Postfix 和 Dovecot。

假設您使用的是舊版本的 Cyber​​Panel，或者您在升級到 v1.9.4 之前已經創建了一個網站。您可以繼續創建 mail.domain.com 作為主域的子域，同時確保為該域頒發 SSL。

第 1 步：使用任何編輯器打開文件 /etc/postfix/main.cf

sudo nano /etc/postfix/main.cf

第 2 步：通過在開頭添加 # 符號來註釋該文件中的以下兩行。

# smtpd_tls_cert_file = /etc/pki/dovecot/certs/dovecot.pem 
# smtpd_tls_key_file = /etc/pki/dovecot/private/dovecot.pem

第3步：更改後添加以下行。請記住將 YourPrimaryMailServerDomain 替換為您自己的域。

# provide the primary certificate for the server, to be used for outgoing connections 
smtpd_tls_chain_files = /etc/letsencrypt/live/mail.yourprimarymailserverdomain.com/privkey.pem, /etc/letsencrypt/live/mail.yourprimarymailserverdomain.com/fullchain.pem

第 4 步：為了支持 SNI，您需要在末尾添加以下行

# provide the map to be used when SNI support is enabled 
tls_server_sni_maps = hash:/etc/postfix/vmail_ssl.map

完成上述所有步驟後，您的文件應如下所示

# smtpd_tls_cert_file = /etc/pki/dovecot/certs/dovecot.pem
# smtpd_tls_key_file = /etc/pki/dovecot/private/dovecot.pem
# provide the primary certificate for the server, to be used for outgoing connections
smtpd_tls_chain_files = /etc/letsencrypt/live/mail.yourprimarymailserverdomain.com/privkey.pem, /etc/letsencrypt/live/mail.yourprimarymailserverdomain.com/fullchain.pem
# provide the map to be used when SNI support is enabled
tls_server_sni_maps = hash:/etc/postfix/vmail_ssl.map

第 5 步：在 /etc/postfix 中創建一個名為 vmail_ssl.map 的新文件

sudo touch /etc/postfix/vmail_ssl.map

第 6 步：編輯文件以將您的域的 SSL 證書添加到列表中，如下所示

mail.yourprimarymailserverdomain.com /etc/letsencrypt/live/mail.yourprimarymailserverdomain.com/privkey.pem /etc/letsencrypt/live/mail.yourprimarymailserverdomain.com/fullchain.pem

第 7 步（可選）：如果您有多個要支持的域，則每行添加一個。生成的文件應如下所示

# Compile with postmap -F hash:/etc/postfix/vmail_ssl.map when updating
# One host per line
mail.yourprimarymailserverdomain.com /etc/letsencrypt/live/mail.yourprimarymailserverdomain.com/privkey.pem /etc/letsencrypt/live/mail.yourprimarymailserverdomain.com/fullchain.pem
mail.yoursecondarymailserverdomain.com /etc/letsencrypt/live/mail.yoursecondarymailserverdomain.com/privkey.pem /etc/letsencrypt/live/mail.yoursecondarymailserverdomain.com/fullchain.pem
# add more domains with keys and certs as needed

第 8 步：打開 /etc/dovecot/dovecot.conf

sudo nano /etc/dovecot/dovecot.conf

第 9 步：將以下內容附加到文件末尾，將 domain.com 替換為您自己的域。

local_name mail.domain.com {
 ssl_cert = </etc/letsencrypt/live/mail.domain.com/fullchain.pem
 ssl_key = </etc/letsencrypt/live/mail.domain.com/privkey.pem
}

第 10 步：使用以下命令重新編譯帶有 SNI 的 postmap

postmap -F hash:/etc/postfix/vmail_ssl.map

第 11 步：重新啟動 Postfix。

systemctl restart postfix

第 12 步：重新啟動 Dovecot

systemctl restart dovecot

使用郵件客戶端再次連接，您應該不會看到錯誤。

參考：https ://cyberpanel.net/docs/6-self-signed-ssl-error-on-outlook-thunderbird/

祝你好運。:)

引用自：https://serverfault.com/questions/1068003

相關問答

Ubuntu

在沒有真正 Linux 使用者的情況下設置郵件帳戶

  • April 7, 2020
檢視問答
Postfix

2016 年電子郵件設置的埠決策（Ubuntu）

  • April 10, 2016
檢視問答
Postfix

SquirrelMail 顯示空收件箱。這個文件夾是空的

  • March 18, 2015
檢視問答
Postfix

如何告訴我的伺服器允許通過郵件客戶端登錄？

  • September 14, 2013
檢視問答
Postfix

Postfix：專用使用者發送電子郵件

  • August 28, 2022
檢視問答
Postfix

Postfix Dovecot 的 SMTP 身份驗證問題

  • October 10, 2021
檢視問答