dovecot sometimes sends non-default SSL cert if IMAP client won't send SNI
Hi,
I recognised some funny behaviour on my server. IMAP clients which won't send an Server Name Indication (SNI) sometimes get the wrong certificate. I would expect that those clients always get the default certificate (of my new domain), instead in about 20 to 50% of connections the certificate of my old domain will be presented. (sample rate was 3 times 30 connections)
Clients sending SNI always get the right certificate.
A user informed me that offlineIMAP complains 'CA Cert verifying failed: no matching domain name found in certificate' So at least offlineIMAP 7.0.12 from Debain stretch won't send SNI, there is a newer version upstream though.
I myself checked the server's behaviour with openssl:
$ openssl s_client -showcerts -connect IP-address:993
and
$ openssl s_client -showcerts -connect IP-address:993 -servername imap.domain
I'm totally clueless about how come.
Best regards Martin Johannes Dauser
# 2.2.10: /etc/dovecot/dovecot.conf # OS: Linux 3.10.0-862.el7.x86_64 x86_64 Red Hat Enterprise Linux Server release 7.5 (Maipo)
...
service imap-login { inet_listener imap { address = 127.0.0.1 port = 143 } inet_listener imaps { port = 993 ssl = yes } process_min_avail = 8 service_count = 0 }
...
ssl = required # set default cert ssl_cert =
ssl_key =
...
# set alternativ cert for old domain local_name mail.old.domain { ssl_cert =
# set explicit cert for new domain local_name mail.new.domain { ssl_cert =
Can you provide some details on what those openssl commands returned?
Aki
On 20.07.2018 12:14, Martin Johannes Dauser wrote:
Hi,
I recognised some funny behaviour on my server. IMAP clients which won't send an Server Name Indication (SNI) sometimes get the wrong certificate. I would expect that those clients always get the default certificate (of my new domain), instead in about 20 to 50% of connections the certificate of my old domain will be presented. (sample rate was 3 times 30 connections)
Clients sending SNI always get the right certificate.
A user informed me that offlineIMAP complains 'CA Cert verifying failed: no matching domain name found in certificate' So at least offlineIMAP 7.0.12 from Debain stretch won't send SNI, there is a newer version upstream though.
I myself checked the server's behaviour with openssl:
$ openssl s_client -showcerts -connect IP-address:993
and
$ openssl s_client -showcerts -connect IP-address:993 -servername imap.domain
I'm totally clueless about how come.
Best regards Martin Johannes Dauser
# 2.2.10: /etc/dovecot/dovecot.conf # OS: Linux 3.10.0-862.el7.x86_64 x86_64 Red Hat Enterprise Linux Server release 7.5 (Maipo)
...
service imap-login { inet_listener imap { address = 127.0.0.1 port = 143 } inet_listener imaps { port = 993 ssl = yes } process_min_avail = 8 service_count = 0 }
...
ssl = required # set default cert ssl_cert =
ssl_key =
...
# set alternativ cert for old domain local_name mail.old.domain { ssl_cert =
# set explicit cert for new domain local_name mail.new.domain { ssl_cert =
Sure, and thanks for trying to help!
These are the two correct answers when SNI is included. The certificates are fully chained. Both certificates carry the same subject mail.cs.sbg.ac.at but differ in Subject Alternative Name (SAN).
X509v3 Subject Alternative Name: DNS:mail.cs.sbg.ac.at, DNS:smtp.cs.sbg.ac.at, DNS:imap.cs.sbg.ac.at, DNS:pop.cs.sbg.ac.at
X509v3 Subject Alternative Name: DNS:mail.cs.sbg.ac.at, DNS:mail.cosy.sbg.ac.at, DNS:smtp.cosy.sbg.ac.at, DNS:imap.cosy.sbg.ac.at, DNS:pop.cosy.sbg.ac.at
I thought of attaching a file with 13 outputs of command $ openssl s_client -showcerts -connect 141.201.4.5:993 but this would certainly exceed the limit of 40kb. Anyway, except for the SSL handshake the outputs exactly meet the two examples a few lines below.
Statistics: Only connections 10,11,13 showed the default certificate. So running only a few connections might end up with 100% false certs -- or the other way round.
OpenSSL itself is always happy, as both certificates fit to the (r)DNS records of mail.cs.sbg.ac.at/141.201.4.5.
Would it help you to run dovecot in debug mode?
################################################################### $ openssl s_client -showcerts -connect 141.201.4.5:993 -servername imap.cs.sbg.ac.at
CONNECTED(00000003)
Certificate chain 0 s:/C=AT/ST=Salzburg/L=Salzburg/O=University of Salzburg/OU=Department of Computer Science/CN=mail.cs.sbg.ac.at i:/C=NL/ST=Noord-Holland/L=Amsterdam/O=TERENA/CN=TERENA SSL CA 3 -----BEGIN CERTIFICATE----- MIIGjDCCBXSgAwIBAgIQApnSP3xZbyr6dGTMvuxaSDANBgkqhkiG9w0BAQ0FADBk MQswCQYDVQQGEwJOTDEWMBQGA1UECBMNTm9vcmQtSG9sbGFuZDESMBAGA1UEBxMJ QW1zdGVyZGFtMQ8wDQYDVQQKEwZURVJFTkExGDAWBgNVBAMTD1RFUkVOQSBTU0wg Q0EgMzAeFw0xNzAxMjQwMDAwMDBaFw0yMDAxMjgxMjAwMDBaMIGZMQswCQYDVQQG EwJBVDERMA8GA1UECBMIU2FsemJ1cmcxETAPBgNVBAcTCFNhbHpidXJnMR8wHQYD VQQKExZVbml2ZXJzaXR5IG9mIFNhbHpidXJnMScwJQYDVQQLEx5EZXBhcnRtZW50 IG9mIENvbXB1dGVyIFNjaWVuY2UxGjAYBgNVBAMTEW1haWwuY3Muc2JnLmFjLmF0 MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAus33Jb+HE64oJvBEwpeh 7cwyMAknhE5k/49eUG7/E0j2ffEo1APzxYooZ1hlHcf7meH7h1KYD3lSXw5RX0Mi KtuUHSUIqYE1U3+pyussB11r18ucHk8MoFQqPnJDeuSPaHozmdQtJJHRVDabddHz 5l4RVEUduUjzl7vnfFrBhbHV/LpYcLMsNgdlg5I0TXU99Y8paMeF32cWiR2dCeyN t2AajjMpHYRDaJ9DGed8nWOeqK0YRQuaEGF68VBVdygDcOQ0eBflwYEjJChJHhN4 UsQSmwoXYj5ZRvyhcAxxPDYveNhM4oVox67Nvw1AgHz/spaWgJVMKrTU4hFDYcnO 0F6KkumLke0t4IvoLEU7ScAm6d3ttQ5ZBbSIX811kWHC/ddu12AhRiq3y5fN2o3n 6pbRrqljyg4Mu0Tj9UEuwC8bJnCJreo32HQwo82vD1xU8jPUci4UoD21PfkjFssm qbtwwWs1KAIvX52U79u6CC7hvsPNtCiMK0K6/9jg8OyKMraBWvIUV6YxgnuJZ4Mi so/OD6uqdpqCYuq5LLZVAVcBu/vGTzfcckkz71nN2eZSO870rnxyHeTWmepQv4nc gxN49JeReO4zZMio6eC5N9D+SYc5Ae5mS8qyHe/gur6VmbmbWk/vRt/m75lcGLgR A4FRqRvu+GIWNh0uCP9SlkUCAwEAAaOCAgIwggH+MB8GA1UdIwQYMBaAFGf9iCAU J5jHCdIlGbvpURFjdVBiMB0GA1UdDgQWBBR6nRddyu+D1h42fba+bgkBi6OipzBU BgNVHREETTBLghFtYWlsLmNzLnNiZy5hYy5hdIIRc210cC5jcy5zYmcuYWMuYXSC EWltYXAuY3Muc2JnLmFjLmF0ghBwb3AuY3Muc2JnLmFjLmF0MA4GA1UdDwEB/wQE AwIFoDAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwawYDVR0fBGQwYjAv oC2gK4YpaHR0cDovL2NybDMuZGlnaWNlcnQuY29tL1RFUkVOQVNTTENBMy5jcmww L6AtoCuGKWh0dHA6Ly9jcmw0LmRpZ2ljZXJ0LmNvbS9URVJFTkFTU0xDQTMuY3Js MEwGA1UdIARFMEMwNwYJYIZIAYb9bAEBMCowKAYIKwYBBQUHAgEWHGh0dHBzOi8v d3d3LmRpZ2ljZXJ0LmNvbS9DUFMwCAYGZ4EMAQICMG4GCCsGAQUFBwEBBGIwYDAk BggrBgEFBQcwAYYYaHR0cDovL29jc3AuZGlnaWNlcnQuY29tMDgGCCsGAQUFBzAC hixodHRwOi8vY2FjZXJ0cy5kaWdpY2VydC5jb20vVEVSRU5BU1NMQ0EzLmNydDAM BgNVHRMBAf8EAjAAMA0GCSqGSIb3DQEBDQUAA4IBAQA6Xbkobv3hQAr532wf0NsZ kYErQebiMLCrKDAhtLc7Z/bO/srUgOs0x9uoIU5ErjLnPcWrPK0eFQevjZ+6CUry NgAcf6f1z9g1IejuapXb6F41YAteJzo+QkvAtQFkOaq9AADXNo6iIOIDyE1M8hWW W0gcwx6h4+UUSLac0LN/i+Q2LcHa6fg/kH59Yt2oIzkJrVRSHn11R8iUHiLgW3X2 XL9BgCZHqI8t3OaJpXLHmvA0pKDIvjFK9+CDcXZWQbZyLlMzGxVyrZfK+rBjL05h QQ3CTy9JJ3/1//AD1mSgog3qSejMQ7ZK01ZZv4lDoEU8ADGFA6VKlV/CiaYz5Ztk -----END CERTIFICATE----- 1 s:/C=NL/ST=Noord-Holland/L=Amsterdam/O=TERENA/CN=TERENA SSL CA 3 i:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert Assured ID Root CA -----BEGIN CERTIFICATE-----
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Server certificate subject=/C=AT/ST=Salzburg/L=Salzburg/O=University of Salzburg/OU=Department of Computer Science/CN=mail.cs.sbg.ac.at issuer=/C=NL/ST=Noord-Holland/L=Amsterdam/O=TERENA/CN=TERENA SSL CA 3
No client certificate CA names sent Peer signing digest: SHA512 Server Temp Key: ECDH, P-384, 384 bits
SSL handshake has read 4882 bytes and written 360 bytes Verification: OK
New, TLSv1.2, Cipher is ECDHE-RSA-AES256-GCM-SHA384 Server public key is 4096 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: E75B0B35DFEFC9F6CABD8851BAA4B2A2E2AE309E3A203333C7CD9CCC4AE0C9A6 Session-ID-ctx: Master-Key: 2D90C5223EB2265793E990153B3877E07B8FF1DCED85EB3A8FC853E3CE4E1C9A5BFF1FA 7123D7FB1CAC517A42DED5E70 PSK identity: None PSK identity hint: None SRP username: None TLS session ticket lifetime hint: 300 (seconds) TLS session ticket: 0000 - 74 4a 71 29 b0 9a 0b 9a-36 5d a4 5d 3c 03 25 5e tJq)....6].]<.%^ 0010 - d2 4c 0b 9d ef b8 ef 04-44 d1 d1 8e d2 60 2d 5f .L......D....`-_ 0020 - 81 67 f6 62 e4 7d 4a 15-17 fa 03 a1 3b 81 70 43 .g.b.}J.....;.pC 0030 - b2 0a 40 ce 7e c1 a7 de-7a 3e ba 01 9f 4b da cd ..@.~...z>...K.. 0040 - 6c 22 a2 63 5d b6 22 5c-fd 75 6b 25 f0 9c 04 a8 l".c]."\.uk%.... 0050 - 36 cb df b0 56 e9 3c 35-a3 0c d1 76 e3 4c c5 62 6...V.<5...v.L.b 0060 - 9f 79 0b 0d fe 88 25 97-d5 d5 3d 93 ac 52 52 eb .y....%...=..RR. 0070 - d6 9f ba b4 b3 a1 ba 91-37 e9 ad 83 92 39 ec f9 ........7....9.. 0080 - 1b 0c 15 3b 07 e5 11 36-b1 8f de d0 b2 69 13 5e ...;...6.....i.^ 0090 - 98 77 46 d0 11 27 72 25-d1 ab 43 a4 14 7f 02 6c .wF..'r%..C....l 00a0 - cd a5 56 6a 13 12 3f ff-ad 0f 59 4b 7a 72 d5 0b ..Vj..?...YKzr..
Start Time: 1532434946 Timeout : 7200 (sec) Verify return code: 0 (ok) Extended master secret: no
- OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE AUTH=PLAIN AUTH=LOGIN] Dovecot ready.
################################################################### $ openssl s_client -showcerts -connect 141.201.4.5:993 -servername imap.cosy.sbg.ac.at
CONNECTED(00000003)
Certificate chain 0 s:/C=AT/L=Salzburg/O=University of Salzburg/OU=Department of Computer Science/CN=mail.cs.sbg.ac.at i:/C=NL/ST=Noord-Holland/L=Amsterdam/O=TERENA/CN=TERENA SSL CA 3 -----BEGIN CERTIFICATE----- MIIIATCCBumgAwIBAgIQAmDFTQk2675Y0/0vo5hcIDANBgkqhkiG9w0BAQsFADBk MQswCQYDVQQGEwJOTDEWMBQGA1UECBMNTm9vcmQtSG9sbGFuZDESMBAGA1UEBxMJ QW1zdGVyZGFtMQ8wDQYDVQQKEwZURVJFTkExGDAWBgNVBAMTD1RFUkVOQSBTU0wg Q0EgMzAeFw0xODA3MTgwMDAwMDBaFw0yMDA3MjIxMjAwMDBaMIGGMQswCQYDVQQG EwJBVDERMA8GA1UEBxMIU2FsemJ1cmcxHzAdBgNVBAoTFlVuaXZlcnNpdHkgb2Yg U2FsemJ1cmcxJzAlBgNVBAsTHkRlcGFydG1lbnQgb2YgQ29tcHV0ZXIgU2NpZW5j ZTEaMBgGA1UEAxMRbWFpbC5jcy5zYmcuYWMuYXQwggIiMA0GCSqGSIb3DQEBAQUA A4ICDwAwggIKAoICAQDulmTg3+JDxZr0uEsxr9521HV+Qja0/+gcQE1UlWe2Tx4V iHx6GtqOSSyDl8vTPvmCv/ethTaGQVFZLWOGK8mvUkNqO0PpzcrucuvO8nyycjWE TWsthWkCK0uIg1ivyWji1gn53XjattDAjbaLCHNKVne3KoD0hM0nNJF56zyv7QSJ xh6HWAHNRb2Uc6R24vmCWdXh8/I5Cs4fHUpi9RQ8Qtw3C6W8JXOfdJ30uEOzHM0d a1lh6eYc+kDQHSdyLc6l7T0/Mm8i0WbbHWk2V5LPEyuqFcbjg9xfX5W2TboJun28 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Yvc4n6jGgk8UrgkPTeloOnhuunZ9HNPaL8gBGCpvPwbJzfHJXg== -----END CERTIFICATE----- 1 s:/C=NL/ST=Noord-Holland/L=Amsterdam/O=TERENA/CN=TERENA SSL CA 3 i:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert Assured ID Root CA -----BEGIN CERTIFICATE----- MIIE+zCCA+OgAwIBAgIQCHC8xa8/25Wakctq7u/kZTANBgkqhkiG9w0BAQsFADBl MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3 d3cuZGlnaWNlcnQuY29tMSQwIgYDVQQDExtEaWdpQ2VydCBBc3N1cmVkIElEIFJv b3QgQ0EwHhcNMTQxMTE4MTIwMDAwWhcNMjQxMTE4MTIwMDAwWjBkMQswCQYDVQQG EwJOTDEWMBQGA1UECBMNTm9vcmQtSG9sbGFuZDESMBAGA1UEBxMJQW1zdGVyZGFt MQ8wDQYDVQQKEwZURVJFTkExGDAWBgNVBAMTD1RFUkVOQSBTU0wgQ0EgMzCCASIw DQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMV2Dw/ZQyk7bG3RR63eEL8jwnio Snc18SNb4EweQefCMQC9iDdFdd25AhCAHo/tZCMERaegOTuBTc9jP8JJ/yKeiLDS lrlcinQfkioq8hLIt2hUtVhBgUBoBhpPhSn7tU08D08/QJYbzqjMXjX/ZJj1dd10 VAWgNhEEEiRVY++Udy538RV27tOkWUUhn6i+0SftCuirOMo/h9Ha8Y+5Cx9E5+Ct 85XCFk3shKM6ktTPxn3mvcsaQE+zVLHzj28NHuO+SaNW5Ae8jafOHbBbV1bRxBz8 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hS+1NGClXwmgmkMd1L8tRNaN2v11y18WoA5hwnA9Ng== -----END CERTIFICATE----- 2 s:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert Assured ID Root CA i:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert Assured ID Root CA -----BEGIN CERTIFICATE----- MIIDtzCCAp+gAwIBAgIQDOfg5RfYRv6P5WD8G/AwOTANBgkqhkiG9w0BAQUFADBl MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3 d3cuZGlnaWNlcnQuY29tMSQwIgYDVQQDExtEaWdpQ2VydCBBc3N1cmVkIElEIFJv b3QgQ0EwHhcNMDYxMTEwMDAwMDAwWhcNMzExMTEwMDAwMDAwWjBlMQswCQYDVQQG EwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3d3cuZGlnaWNl cnQuY29tMSQwIgYDVQQDExtEaWdpQ2VydCBBc3N1cmVkIElEIFJvb3QgQ0EwggEi MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCtDhXO5EOAXLGH87dg+XESpa7c JpSIqvTO9SA5KFhgDPiA2qkVlTJhPLWxKISKityfCgyDF3qPkKyK53lTXDGEKvYP mDI2dsze3Tyoou9q+yHyUmHfnyDXH+Kx2f4YZNISW1/5WBg1vEfNoTb5a3/UsDg+ wRvDjDPZ2C8Y/igPs6eD1sNuRMBhNZYW/lmci3Zt1/GiSw0r/wty2p5g0I6QNcZ4 VYcgoc/lbQrISXwxmDNsIumH0DJaoroTghHtORedmTpyoeb6pNnVFzF1roV9Iq4/ 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Server certificate subject=/C=AT/L=Salzburg/O=University of Salzburg/OU=Department of Computer Science/CN=mail.cs.sbg.ac.at issuer=/C=NL/ST=Noord-Holland/L=Amsterdam/O=TERENA/CN=TERENA SSL CA 3
No client certificate CA names sent Peer signing digest: SHA512 Server Temp Key: ECDH, P-384, 384 bits
SSL handshake has read 5255 bytes and written 362 bytes Verification: OK
New, TLSv1.2, Cipher is ECDHE-RSA-AES256-GCM-SHA384
Server public key is 4096 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:
1F74E0FB2AC74C65A4C68CAE898C305C6DB245A3566078A6C85E74572593951B
Session-ID-ctx:
Master-Key:
C6CEE7B44A640152E71EB72172DEC4DCD0604585A9D38427AA6E4604E4B8351458B648D
7010D8757924DDB82EC181585
PSK identity: None
PSK identity hint: None
SRP username: None
TLS session ticket lifetime hint: 300 (seconds)
TLS session ticket:
0000 - b2 8f ed 2a fc 9a f8 4e-4b aa b8 9e 56 e1 01
95 ...*...NK...V...
0010 - 3d 9b 01 c4 b6 dc 64 0a-9c 1a be 5d a4 7f f0
c9 =.....d....]....
0020 - 12 d8 f0 94 f3 8c 92 7f-b8 fa f9 cd 60 e0 21
e8 .............!. 0030 - d3 63 77 65 6f e7 ec 04-09 b4 f2 bb df cd 6d 10 .cweo.........m. 0040 - dd 1a 87 fb c1 b7 de 89-f2 05 0f 70 3b 0d ef 62 ...........p;..b 0050 - d4 60 f7 54 1b 38 bf d9-8f f7 81 56 1f 61 2d b6 ..T.8.....V.a-.
0060 - f4 06 f1 e3 ba 65 95 95-d0 6b dd 92 39 30 1f
e2 .....e...k..90..
0070 - 6e 60 6e 39 d6 51 ed a4-ae 8e 4a b6 ae 3e d6
77 n`n9.Q....J..>.w
0080 - d9 f9 5d d6 fc b1 a5 89-94 e9 4b c5 cb 39 24
3c ..].......K..9$<
0090 - 65 06 81 56 0b 16 d5 b6-a2 34 11 ea 18 c9 a3
6a e..V.....4.....j
00a0 - ae a7 62 75 f4 5b 37 31-6f f4 56 26 06 78 2c
62 ..bu.[71o.V&.x,b
Start Time: 1532434962 Timeout : 7200 (sec) Verify return code: 0 (ok) Extended master secret: no
- OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE AUTH=PLAIN AUTH=LOGIN] Dovecot ready.
On Mon, 2018-07-23 at 10:05 +0300, Aki Tuomi wrote:
Can you provide some details on what those openssl commands returned?
Aki
On 20.07.2018 12:14, Martin Johannes Dauser wrote:
Hi,
I recognised some funny behaviour on my server. IMAP clients which won't send an Server Name Indication (SNI) sometimes get the wrong certificate. I would expect that those clients always get the default certificate (of my new domain), instead in about 20 to 50% of connections the certificate of my old domain will be presented. (sample rate was 3 times 30 connections)
Clients sending SNI always get the right certificate.
A user informed me that offlineIMAP complains 'CA Cert verifying failed: no matching domain name found in certificate' So at least offlineIMAP 7.0.12 from Debain stretch won't send SNI, there is a newer version upstream though.
I myself checked the server's behaviour with openssl:
$ openssl s_client -showcerts -connect IP-address:993
and
$ openssl s_client -showcerts -connect IP-address:993 -servername imap.domain
I'm totally clueless about how come.
Best regards Martin Johannes Dauser
# 2.2.10: /etc/dovecot/dovecot.conf # OS: Linux 3.10.0-862.el7.x86_64 x86_64 Red Hat Enterprise Linux Server release 7.5 (Maipo)
...
service imap-login { inet_listener imap { address = 127.0.0.1 port = 143 } inet_listener imaps { port = 993 ssl = yes } process_min_avail = 8 service_count = 0 }
...
ssl = required # set default cert ssl_cert =
ssl_key =
...
# set alternativ cert for old domain local_name mail.old.domain { ssl_cert =
# set explicit cert for new domain local_name mail.new.domain { ssl_cert =
Well. At least I know now the cn overlaps. That should not be a problem but is at least something to pursue.
---Aki TuomiDovecot oy -------- Original message --------From: Martin Johannes Dauser mdauser@cs.sbg.ac.at Date: 24/07/2018 18:03 (GMT+02:00) To: dovecot@dovecot.org Subject: Re: dovecot sometimes sends non-default SSL cert if IMAP client won't send SNI Sure, and thanks for trying to help!
These are the two correct answers when SNI is included. The certificates are fully chained. Both certificates carry the same subject mail.cs.sbg.ac.at but differ in Subject Alternative Name (SAN).
X509v3 Subject Alternative Name: DNS:mail.cs.sbg.ac.at, DNS:smtp.cs.sbg.ac.at, DNS:imap.cs.sbg.ac.at, DNS:pop.cs.sbg.ac.at
X509v3 Subject Alternative Name: DNS:mail.cs.sbg.ac.at, DNS:mail.cosy.sbg.ac.at, DNS:smtp.cosy.sbg.ac.at, DNS:imap.cosy.sbg.ac.at, DNS:pop.cosy.sbg.ac.at
I thought of attaching a file with 13 outputs of command $ openssl s_client -showcerts -connect 141.201.4.5:993 but this would certainly exceed the limit of 40kb. Anyway, except for the SSL handshake the outputs exactly meet the two examples a few lines below.
Statistics: Only connections 10,11,13 showed the default certificate. So running only a few connections might end up with 100% false certs -- or the other way round.
OpenSSL itself is always happy, as both certificates fit to the (r)DNS records of mail.cs.sbg.ac.at/141.201.4.5.
Would it help you to run dovecot in debug mode?
################################################################### $ openssl s_client -showcerts -connect 141.201.4.5:993 -servername imap.cs.sbg.ac.at
CONNECTED(00000003)
Certificate chain 0 s:/C=AT/ST=Salzburg/L=Salzburg/O=University of Salzburg/OU=Department of Computer Science/CN=mail.cs.sbg.ac.at i:/C=NL/ST=Noord-Holland/L=Amsterdam/O=TERENA/CN=TERENA SSL CA 3 -----BEGIN CERTIFICATE----- MIIGjDCCBXSgAwIBAgIQApnSP3xZbyr6dGTMvuxaSDANBgkqhkiG9w0BAQ0FADBk MQswCQYDVQQGEwJOTDEWMBQGA1UECBMNTm9vcmQtSG9sbGFuZDESMBAGA1UEBxMJ QW1zdGVyZGFtMQ8wDQYDVQQKEwZURVJFTkExGDAWBgNVBAMTD1RFUkVOQSBTU0wg Q0EgMzAeFw0xNzAxMjQwMDAwMDBaFw0yMDAxMjgxMjAwMDBaMIGZMQswCQYDVQQG EwJBVDERMA8GA1UECBMIU2FsemJ1cmcxETAPBgNVBAcTCFNhbHpidXJnMR8wHQYD VQQKExZVbml2ZXJzaXR5IG9mIFNhbHpidXJnMScwJQYDVQQLEx5EZXBhcnRtZW50 IG9mIENvbXB1dGVyIFNjaWVuY2UxGjAYBgNVBAMTEW1haWwuY3Muc2JnLmFjLmF0 MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAus33Jb+HE64oJvBEwpeh 7cwyMAknhE5k/49eUG7/E0j2ffEo1APzxYooZ1hlHcf7meH7h1KYD3lSXw5RX0Mi KtuUHSUIqYE1U3+pyussB11r18ucHk8MoFQqPnJDeuSPaHozmdQtJJHRVDabddHz 5l4RVEUduUjzl7vnfFrBhbHV/LpYcLMsNgdlg5I0TXU99Y8paMeF32cWiR2dCeyN t2AajjMpHYRDaJ9DGed8nWOeqK0YRQuaEGF68VBVdygDcOQ0eBflwYEjJChJHhN4 UsQSmwoXYj5ZRvyhcAxxPDYveNhM4oVox67Nvw1AgHz/spaWgJVMKrTU4hFDYcnO 0F6KkumLke0t4IvoLEU7ScAm6d3ttQ5ZBbSIX811kWHC/ddu12AhRiq3y5fN2o3n 6pbRrqljyg4Mu0Tj9UEuwC8bJnCJreo32HQwo82vD1xU8jPUci4UoD21PfkjFssm qbtwwWs1KAIvX52U79u6CC7hvsPNtCiMK0K6/9jg8OyKMraBWvIUV6YxgnuJZ4Mi so/OD6uqdpqCYuq5LLZVAVcBu/vGTzfcckkz71nN2eZSO870rnxyHeTWmepQv4nc gxN49JeReO4zZMio6eC5N9D+SYc5Ae5mS8qyHe/gur6VmbmbWk/vRt/m75lcGLgR A4FRqRvu+GIWNh0uCP9SlkUCAwEAAaOCAgIwggH+MB8GA1UdIwQYMBaAFGf9iCAU J5jHCdIlGbvpURFjdVBiMB0GA1UdDgQWBBR6nRddyu+D1h42fba+bgkBi6OipzBU BgNVHREETTBLghFtYWlsLmNzLnNiZy5hYy5hdIIRc210cC5jcy5zYmcuYWMuYXSC EWltYXAuY3Muc2JnLmFjLmF0ghBwb3AuY3Muc2JnLmFjLmF0MA4GA1UdDwEB/wQE AwIFoDAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwawYDVR0fBGQwYjAv oC2gK4YpaHR0cDovL2NybDMuZGlnaWNlcnQuY29tL1RFUkVOQVNTTENBMy5jcmww L6AtoCuGKWh0dHA6Ly9jcmw0LmRpZ2ljZXJ0LmNvbS9URVJFTkFTU0xDQTMuY3Js MEwGA1UdIARFMEMwNwYJYIZIAYb9bAEBMCowKAYIKwYBBQUHAgEWHGh0dHBzOi8v d3d3LmRpZ2ljZXJ0LmNvbS9DUFMwCAYGZ4EMAQICMG4GCCsGAQUFBwEBBGIwYDAk BggrBgEFBQcwAYYYaHR0cDovL29jc3AuZGlnaWNlcnQuY29tMDgGCCsGAQUFBzAC hixodHRwOi8vY2FjZXJ0cy5kaWdpY2VydC5jb20vVEVSRU5BU1NMQ0EzLmNydDAM BgNVHRMBAf8EAjAAMA0GCSqGSIb3DQEBDQUAA4IBAQA6Xbkobv3hQAr532wf0NsZ kYErQebiMLCrKDAhtLc7Z/bO/srUgOs0x9uoIU5ErjLnPcWrPK0eFQevjZ+6CUry NgAcf6f1z9g1IejuapXb6F41YAteJzo+QkvAtQFkOaq9AADXNo6iIOIDyE1M8hWW W0gcwx6h4+UUSLac0LN/i+Q2LcHa6fg/kH59Yt2oIzkJrVRSHn11R8iUHiLgW3X2 XL9BgCZHqI8t3OaJpXLHmvA0pKDIvjFK9+CDcXZWQbZyLlMzGxVyrZfK+rBjL05h QQ3CTy9JJ3/1//AD1mSgog3qSejMQ7ZK01ZZv4lDoEU8ADGFA6VKlV/CiaYz5Ztk -----END CERTIFICATE----- 1 s:/C=NL/ST=Noord-Holland/L=Amsterdam/O=TERENA/CN=TERENA SSL CA 3 i:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert Assured ID Root CA -----BEGIN CERTIFICATE-----
MIIE+zCCA+OgAwIBAgIQCHC8xa8/25Wakctq7u/kZTANBgkqhkiG9w0BAQsFADBl MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3 d3cuZGlnaWNlcnQuY29tMSQwIgYDVQQDExtEaWdpQ2VydCBBc3N1cmVkIElEIFJv b3QgQ0EwHhcNMTQxMTE4MTIwMDAwWhcNMjQxMTE4MTIwMDAwWjBkMQswCQYDVQQG EwJOTDEWMBQGA1UECBMNTm9vcmQtSG9sbGFuZDESMBAGA1UEBxMJQW1zdGVyZGFt MQ8wDQYDVQQKEwZURVJFTkExGDAWBgNVBAMTD1RFUkVOQSBTU0wgQ0EgMzCCASIw DQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMV2Dw/ZQyk7bG3RR63eEL8jwnio Snc18SNb4EweQefCMQC9iDdFdd25AhCAHo/tZCMERaegOTuBTc9jP8JJ/yKeiLDS lrlcinQfkioq8hLIt2hUtVhBgUBoBhpPhSn7tU08D08/QJYbzqjMXjX/ZJj1dd10 VAWgNhEEEiRVY++Udy538RV27tOkWUUhn6i+0SftCuirOMo/h9Ha8Y+5Cx9E5+Ct 85XCFk3shKM6ktTPxn3mvcsaQE+zVLHzj28NHuO+SaNW5Ae8jafOHbBbV1bRxBz8 mGXRzUYvkZS/RYVJ+G1ShxwCVgEnFqtyLvRx5GG1IKD6JmlqCvGrn223zyUCAwEA AaOCAaYwggGiMBIGA1UdEwEB/wQIMAYBAf8CAQAwDgYDVR0PAQH/BAQDAgGGMHkG CCsGAQUFBwEBBG0wazAkBggrBgEFBQcwAYYYaHR0cDovL29jc3AuZGlnaWNlcnQu Y29tMEMGCCsGAQUFBzAChjdodHRwOi8vY2FjZXJ0cy5kaWdpY2VydC5jb20vRGln aUNlcnRBc3N1cmVkSURSb290Q0EuY3J0MIGBBgNVHR8EejB4MDqgOKA2hjRodHRw Oi8vY3JsMy5kaWdpY2VydC5jb20vRGlnaUNlcnRBc3N1cmVkSURSb290Q0EuY3Js MDqgOKA2hjRodHRwOi8vY3JsNC5kaWdpY2VydC5jb20vRGlnaUNlcnRBc3N1cmVk SURSb290Q0EuY3JsMD0GA1UdIAQ2MDQwMgYEVR0gADAqMCgGCCsGAQUFBwIBFhxo dHRwczovL3d3dy5kaWdpY2VydC5jb20vQ1BTMB0GA1UdDgQWBBRn/YggFCeYxwnS JRm76VERY3VQYjAfBgNVHSMEGDAWgBRF66Kv9JLLgjEtUYunpyGd823IDzANBgkq hkiG9w0BAQsFAAOCAQEAqSg1esR71tonHqyYzyc2TxEydHTmQN0dzfJodzWvs4xd xgS/FfQjZ4u5b5cE60adws3J0aSugS7JurHogNAcyTnBVnZZbJx946nw09E02DxJ WYsamM6/xvLYMDX/6W9doK867mZTrqqMaci+mqege9iCSzMTyAfzd9fzZM2eY/lC J1OuEDOJcjcV8b73HjWizsMt8tey5gvHacDlH198aZt+ziYaM0TDuncFO7pdP0GJ +hY77gRuW6xWS++McPJKe1e9GW6LNgdUJi2GCZQfXzer8CM/jyxflp5HcahE3qm5 hS+1NGClXwmgmkMd1L8tRNaN2v11y18WoA5hwnA9Ng== -----END CERTIFICATE----- 2 s:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert Assured ID Root CA i:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert Assured ID Root CA -----BEGIN CERTIFICATE----- MIIDtzCCAp+gAwIBAgIQDOfg5RfYRv6P5WD8G/AwOTANBgkqhkiG9w0BAQUFADBl MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3 d3cuZGlnaWNlcnQuY29tMSQwIgYDVQQDExtEaWdpQ2VydCBBc3N1cmVkIElEIFJv b3QgQ0EwHhcNMDYxMTEwMDAwMDAwWhcNMzExMTEwMDAwMDAwWjBlMQswCQYDVQQG EwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3d3cuZGlnaWNl cnQuY29tMSQwIgYDVQQDExtEaWdpQ2VydCBBc3N1cmVkIElEIFJvb3QgQ0EwggEi MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCtDhXO5EOAXLGH87dg+XESpa7c JpSIqvTO9SA5KFhgDPiA2qkVlTJhPLWxKISKityfCgyDF3qPkKyK53lTXDGEKvYP mDI2dsze3Tyoou9q+yHyUmHfnyDXH+Kx2f4YZNISW1/5WBg1vEfNoTb5a3/UsDg+ wRvDjDPZ2C8Y/igPs6eD1sNuRMBhNZYW/lmci3Zt1/GiSw0r/wty2p5g0I6QNcZ4 VYcgoc/lbQrISXwxmDNsIumH0DJaoroTghHtORedmTpyoeb6pNnVFzF1roV9Iq4/ AUaG9ih5yLHa5FcXxH4cDrC0kqZWs72yl+2qp/C3xag/lRbQ/6GW6whfGHdPAgMB AAGjYzBhMA4GA1UdDwEB/wQEAwIBhjAPBgNVHRMBAf8EBTADAQH/MB0GA1UdDgQW BBRF66Kv9JLLgjEtUYunpyGd823IDzAfBgNVHSMEGDAWgBRF66Kv9JLLgjEtUYun pyGd823IDzANBgkqhkiG9w0BAQUFAAOCAQEAog683+Lt8ONyc3pklL/3cmbYMuRC dWKuh+vy1dneVrOfzM4UKLkNl2BcEkxY5NM9g0lFWJc1aRqoR+pWxnmrEthngYTf fwk8lOa4JiwgvT2zKIn3X/8i4peEH+ll74fg38FnSbNd67IJKusm7Xi+fT8r87cm NW1fiQG2SVufAQWbqz0lwcy2f8Lxb4bG+mRo64EtlOtCt/qMHt1i8b5QZ7dsvfPx H2sMNgcWfzd8qVttevESRmCD1ycEvkvOl77DZypoEd+A5wwzZr8TDRRu838fYxAe +o0bJW1sj6W3YQGx0qMmoRBxna3iw/nDmVG3KwcIzi7mULKn+gpFL6Lw8g== -----END CERTIFICATE-----
Server certificate subject=/C=AT/ST=Salzburg/L=Salzburg/O=University of Salzburg/OU=Department of Computer Science/CN=mail.cs.sbg.ac.at issuer=/C=NL/ST=Noord-Holland/L=Amsterdam/O=TERENA/CN=TERENA SSL CA 3
No client certificate CA names sent Peer signing digest: SHA512 Server Temp Key: ECDH, P-384, 384 bits
SSL handshake has read 4882 bytes and written 360 bytes Verification: OK
New, TLSv1.2, Cipher is ECDHE-RSA-AES256-GCM-SHA384 Server public key is 4096 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: E75B0B35DFEFC9F6CABD8851BAA4B2A2E2AE309E3A203333C7CD9CCC4AE0C9A6 Session-ID-ctx: Master-Key: 2D90C5223EB2265793E990153B3877E07B8FF1DCED85EB3A8FC853E3CE4E1C9A5BFF1FA 7123D7FB1CAC517A42DED5E70 PSK identity: None PSK identity hint: None SRP username: None TLS session ticket lifetime hint: 300 (seconds) TLS session ticket: 0000 - 74 4a 71 29 b0 9a 0b 9a-36 5d a4 5d 3c 03 25 5e tJq)....6].]<.%^ 0010 - d2 4c 0b 9d ef b8 ef 04-44 d1 d1 8e d2 60 2d 5f .L......D....`-_ 0020 - 81 67 f6 62 e4 7d 4a 15-17 fa 03 a1 3b 81 70 43 .g.b.}J.....;.pC 0030 - b2 0a 40 ce 7e c1 a7 de-7a 3e ba 01 9f 4b da cd ..@.~...z>...K.. 0040 - 6c 22 a2 63 5d b6 22 5c-fd 75 6b 25 f0 9c 04 a8 l".c]."\.uk%.... 0050 - 36 cb df b0 56 e9 3c 35-a3 0c d1 76 e3 4c c5 62 6...V.<5...v.L.b 0060 - 9f 79 0b 0d fe 88 25 97-d5 d5 3d 93 ac 52 52 eb .y....%...=..RR. 0070 - d6 9f ba b4 b3 a1 ba 91-37 e9 ad 83 92 39 ec f9 ........7....9.. 0080 - 1b 0c 15 3b 07 e5 11 36-b1 8f de d0 b2 69 13 5e ...;...6.....i.^ 0090 - 98 77 46 d0 11 27 72 25-d1 ab 43 a4 14 7f 02 6c .wF..'r%..C....l 00a0 - cd a5 56 6a 13 12 3f ff-ad 0f 59 4b 7a 72 d5 0b ..Vj..?...YKzr..
Start Time: 1532434946 Timeout : 7200 (sec) Verify return code: 0 (ok) Extended master secret: no
- OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE AUTH=PLAIN AUTH=LOGIN] Dovecot ready.
################################################################### $ openssl s_client -showcerts -connect 141.201.4.5:993 -servername imap.cosy.sbg.ac.at
CONNECTED(00000003)
Certificate chain 0 s:/C=AT/L=Salzburg/O=University of Salzburg/OU=Department of Computer Science/CN=mail.cs.sbg.ac.at i:/C=NL/ST=Noord-Holland/L=Amsterdam/O=TERENA/CN=TERENA SSL CA 3 -----BEGIN CERTIFICATE----- MIIIATCCBumgAwIBAgIQAmDFTQk2675Y0/0vo5hcIDANBgkqhkiG9w0BAQsFADBk MQswCQYDVQQGEwJOTDEWMBQGA1UECBMNTm9vcmQtSG9sbGFuZDESMBAGA1UEBxMJ QW1zdGVyZGFtMQ8wDQYDVQQKEwZURVJFTkExGDAWBgNVBAMTD1RFUkVOQSBTU0wg Q0EgMzAeFw0xODA3MTgwMDAwMDBaFw0yMDA3MjIxMjAwMDBaMIGGMQswCQYDVQQG EwJBVDERMA8GA1UEBxMIU2FsemJ1cmcxHzAdBgNVBAoTFlVuaXZlcnNpdHkgb2Yg U2FsemJ1cmcxJzAlBgNVBAsTHkRlcGFydG1lbnQgb2YgQ29tcHV0ZXIgU2NpZW5j ZTEaMBgGA1UEAxMRbWFpbC5jcy5zYmcuYWMuYXQwggIiMA0GCSqGSIb3DQEBAQUA A4ICDwAwggIKAoICAQDulmTg3+JDxZr0uEsxr9521HV+Qja0/+gcQE1UlWe2Tx4V iHx6GtqOSSyDl8vTPvmCv/ethTaGQVFZLWOGK8mvUkNqO0PpzcrucuvO8nyycjWE TWsthWkCK0uIg1ivyWji1gn53XjattDAjbaLCHNKVne3KoD0hM0nNJF56zyv7QSJ xh6HWAHNRb2Uc6R24vmCWdXh8/I5Cs4fHUpi9RQ8Qtw3C6W8JXOfdJ30uEOzHM0d a1lh6eYc+kDQHSdyLc6l7T0/Mm8i0WbbHWk2V5LPEyuqFcbjg9xfX5W2TboJun28 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Yvc4n6jGgk8UrgkPTeloOnhuunZ9HNPaL8gBGCpvPwbJzfHJXg== -----END CERTIFICATE----- 1 s:/C=NL/ST=Noord-Holland/L=Amsterdam/O=TERENA/CN=TERENA SSL CA 3 i:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert Assured ID Root CA -----BEGIN CERTIFICATE----- MIIE+zCCA+OgAwIBAgIQCHC8xa8/25Wakctq7u/kZTANBgkqhkiG9w0BAQsFADBl MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3 d3cuZGlnaWNlcnQuY29tMSQwIgYDVQQDExtEaWdpQ2VydCBBc3N1cmVkIElEIFJv b3QgQ0EwHhcNMTQxMTE4MTIwMDAwWhcNMjQxMTE4MTIwMDAwWjBkMQswCQYDVQQG EwJOTDEWMBQGA1UECBMNTm9vcmQtSG9sbGFuZDESMBAGA1UEBxMJQW1zdGVyZGFt MQ8wDQYDVQQKEwZURVJFTkExGDAWBgNVBAMTD1RFUkVOQSBTU0wgQ0EgMzCCASIw DQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMV2Dw/ZQyk7bG3RR63eEL8jwnio Snc18SNb4EweQefCMQC9iDdFdd25AhCAHo/tZCMERaegOTuBTc9jP8JJ/yKeiLDS lrlcinQfkioq8hLIt2hUtVhBgUBoBhpPhSn7tU08D08/QJYbzqjMXjX/ZJj1dd10 VAWgNhEEEiRVY++Udy538RV27tOkWUUhn6i+0SftCuirOMo/h9Ha8Y+5Cx9E5+Ct 85XCFk3shKM6ktTPxn3mvcsaQE+zVLHzj28NHuO+SaNW5Ae8jafOHbBbV1bRxBz8 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hS+1NGClXwmgmkMd1L8tRNaN2v11y18WoA5hwnA9Ng== -----END CERTIFICATE----- 2 s:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert Assured ID Root CA i:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert Assured ID Root CA -----BEGIN CERTIFICATE----- MIIDtzCCAp+gAwIBAgIQDOfg5RfYRv6P5WD8G/AwOTANBgkqhkiG9w0BAQUFADBl MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3 d3cuZGlnaWNlcnQuY29tMSQwIgYDVQQDExtEaWdpQ2VydCBBc3N1cmVkIElEIFJv b3QgQ0EwHhcNMDYxMTEwMDAwMDAwWhcNMzExMTEwMDAwMDAwWjBlMQswCQYDVQQG EwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3d3cuZGlnaWNl cnQuY29tMSQwIgYDVQQDExtEaWdpQ2VydCBBc3N1cmVkIElEIFJvb3QgQ0EwggEi MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCtDhXO5EOAXLGH87dg+XESpa7c JpSIqvTO9SA5KFhgDPiA2qkVlTJhPLWxKISKityfCgyDF3qPkKyK53lTXDGEKvYP mDI2dsze3Tyoou9q+yHyUmHfnyDXH+Kx2f4YZNISW1/5WBg1vEfNoTb5a3/UsDg+ wRvDjDPZ2C8Y/igPs6eD1sNuRMBhNZYW/lmci3Zt1/GiSw0r/wty2p5g0I6QNcZ4 VYcgoc/lbQrISXwxmDNsIumH0DJaoroTghHtORedmTpyoeb6pNnVFzF1roV9Iq4/ AUaG9ih5yLHa5FcXxH4cDrC0kqZWs72yl+2qp/C3xag/lRbQ/6GW6whfGHdPAgMB AAGjYzBhMA4GA1UdDwEB/wQEAwIBhjAPBgNVHRMBAf8EBTADAQH/MB0GA1UdDgQW BBRF66Kv9JLLgjEtUYunpyGd823IDzAfBgNVHSMEGDAWgBRF66Kv9JLLgjEtUYun pyGd823IDzANBgkqhkiG9w0BAQUFAAOCAQEAog683+Lt8ONyc3pklL/3cmbYMuRC dWKuh+vy1dneVrOfzM4UKLkNl2BcEkxY5NM9g0lFWJc1aRqoR+pWxnmrEthngYTf fwk8lOa4JiwgvT2zKIn3X/8i4peEH+ll74fg38FnSbNd67IJKusm7Xi+fT8r87cm NW1fiQG2SVufAQWbqz0lwcy2f8Lxb4bG+mRo64EtlOtCt/qMHt1i8b5QZ7dsvfPx H2sMNgcWfzd8qVttevESRmCD1ycEvkvOl77DZypoEd+A5wwzZr8TDRRu838fYxAe +o0bJW1sj6W3YQGx0qMmoRBxna3iw/nDmVG3KwcIzi7mULKn+gpFL6Lw8g== -----END CERTIFICATE-----
Server certificate subject=/C=AT/L=Salzburg/O=University of Salzburg/OU=Department of Computer Science/CN=mail.cs.sbg.ac.at issuer=/C=NL/ST=Noord-Holland/L=Amsterdam/O=TERENA/CN=TERENA SSL CA 3
No client certificate CA names sent Peer signing digest: SHA512 Server Temp Key: ECDH, P-384, 384 bits
SSL handshake has read 5255 bytes and written 362 bytes Verification: OK
New, TLSv1.2, Cipher is ECDHE-RSA-AES256-GCM-SHA384
Server public key is 4096 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:
1F74E0FB2AC74C65A4C68CAE898C305C6DB245A3566078A6C85E74572593951B
Session-ID-ctx:
Master-Key:
C6CEE7B44A640152E71EB72172DEC4DCD0604585A9D38427AA6E4604E4B8351458B648D
7010D8757924DDB82EC181585
PSK identity: None
PSK identity hint: None
SRP username: None
TLS session ticket lifetime hint: 300 (seconds)
TLS session ticket:
0000 - b2 8f ed 2a fc 9a f8 4e-4b aa b8 9e 56 e1 01
95 ...*...NK...V...
0010 - 3d 9b 01 c4 b6 dc 64 0a-9c 1a be 5d a4 7f f0
c9 =.....d....]....
0020 - 12 d8 f0 94 f3 8c 92 7f-b8 fa f9 cd 60 e0 21
e8 .............!. 0030 - d3 63 77 65 6f e7 ec 04-09 b4 f2 bb df cd 6d 10 .cweo.........m. 0040 - dd 1a 87 fb c1 b7 de 89-f2 05 0f 70 3b 0d ef 62 ...........p;..b 0050 - d4 60 f7 54 1b 38 bf d9-8f f7 81 56 1f 61 2d b6 ..T.8.....V.a-.
0060 - f4 06 f1 e3 ba 65 95 95-d0 6b dd 92 39 30 1f
e2 .....e...k..90..
0070 - 6e 60 6e 39 d6 51 ed a4-ae 8e 4a b6 ae 3e d6
77 n`n9.Q....J..>.w
0080 - d9 f9 5d d6 fc b1 a5 89-94 e9 4b c5 cb 39 24
3c ..].......K..9$<
0090 - 65 06 81 56 0b 16 d5 b6-a2 34 11 ea 18 c9 a3
6a e..V.....4.....j
00a0 - ae a7 62 75 f4 5b 37 31-6f f4 56 26 06 78 2c
62 ..bu.[71o.V&.x,b
Start Time: 1532434962 Timeout : 7200 (sec) Verify return code: 0 (ok) Extended master secret: no
- OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE AUTH=PLAIN AUTH=LOGIN] Dovecot ready.
On Mon, 2018-07-23 at 10:05 +0300, Aki Tuomi wrote:
Can you provide some details on what those openssl commands returned?
Aki
On 20.07.2018 12:14, Martin Johannes Dauser wrote:
Hi,
I recognised some funny behaviour on my server. IMAP clients which won't send an Server Name Indication (SNI) sometimes get the wrong certificate. I would expect that those clients always get the default certificate (of my new domain), instead in about 20 to 50% of connections the certificate of my old domain will be presented. (sample rate was 3 times 30 connections)
Clients sending SNI always get the right certificate.
A user informed me that offlineIMAP complains 'CA Cert verifying failed: no matching domain name found in certificate' So at least offlineIMAP 7.0.12 from Debain stretch won't send SNI, there is a newer version upstream though.
I myself checked the server's behaviour with openssl:
$ openssl s_client -showcerts -connect IP-address:993
and
$ openssl s_client -showcerts -connect IP-address:993 -servername imap.domain
I'm totally clueless about how come.
Best regards Martin Johannes Dauser
# 2.2.10: /etc/dovecot/dovecot.conf # OS: Linux 3.10.0-862.el7.x86_64 x86_64 Red Hat Enterprise Linux Server release 7.5 (Maipo)
...
service imap-login { inet_listener imap { address = 127.0.0.1 port = 143 } inet_listener imaps { port = 993 ssl = yes } process_min_avail = 8 service_count = 0 }
...
ssl = required # set default cert ssl_cert =
ssl_key =
...
# set alternativ cert for old domain local_name mail.old.domain { ssl_cert =
# set explicit cert for new domain local_name mail.new.domain { ssl_cert =
participants (2)
-
Aki Tuomi
-
Martin Johannes Dauser