Re: dovecot sometimes sends non-default SSL cert if IMAP client won't send SNI
Aki Tuomi
aki.tuomi at dovecot.fi
Tue Jul 24 18:05:51 EEST 2018
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 at cs.sbg.ac.at> Date: 24/07/2018 18:03 (GMT+02:00) To: dovecot at 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
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0F6KkumLke0t4IvoLEU7ScAm6d3ttQ5ZBbSIX811kWHC/ddu12AhRiq3y5fN2o3n
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qbtwwWs1KAIvX52U79u6CC7hvsPNtCiMK0K6/9jg8OyKMraBWvIUV6YxgnuJZ4Mi
so/OD6uqdpqCYuq5LLZVAVcBu/vGTzfcckkz71nN2eZSO870rnxyHeTWmepQv4nc
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BgNVHREETTBLghFtYWlsLmNzLnNiZy5hYy5hdIIRc210cC5jcy5zYmcuYWMuYXSC
EWltYXAuY3Muc2JnLmFjLmF0ghBwb3AuY3Muc2JnLmFjLmF0MA4GA1UdDwEB/wQE
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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
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MQ8wDQYDVQQKEwZURVJFTkExGDAWBgNVBAMTD1RFUkVOQSBTU0wgQ0EgMzCCASIw
DQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMV2Dw/ZQyk7bG3RR63eEL8jwnio
Snc18SNb4EweQefCMQC9iDdFdd25AhCAHo/tZCMERaegOTuBTc9jP8JJ/yKeiLDS
lrlcinQfkioq8hLIt2hUtVhBgUBoBhpPhSn7tU08D08/QJYbzqjMXjX/ZJj1dd10
VAWgNhEEEiRVY++Udy538RV27tOkWUUhn6i+0SftCuirOMo/h9Ha8Y+5Cx9E5+Ct
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JRm76VERY3VQYjAfBgNVHSMEGDAWgBRF66Kv9JLLgjEtUYunpyGd823IDzANBgkq
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WYsamM6/xvLYMDX/6W9doK867mZTrqqMaci+mqege9iCSzMTyAfzd9fzZM2eY/lC
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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
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mDI2dsze3Tyoou9q+yHyUmHfnyDXH+Kx2f4YZNISW1/5WBg1vEfNoTb5a3/UsDg+
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VYcgoc/lbQrISXwxmDNsIumH0DJaoroTghHtORedmTpyoeb6pNnVFzF1roV9Iq4/
AUaG9ih5yLHa5FcXxH4cDrC0kqZWs72yl+2qp/C3xag/lRbQ/6GW6whfGHdPAgMB
AAGjYzBhMA4GA1UdDwEB/wQEAwIBhjAPBgNVHRMBAf8EBTADAQH/MB0GA1UdDgQW
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pyGd823IDzANBgkqhkiG9w0BAQUFAAOCAQEAog683+Lt8ONyc3pklL/3cmbYMuRC
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+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 .. at .~...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
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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
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MQ8wDQYDVQQKEwZURVJFTkExGDAWBgNVBAMTD1RFUkVOQSBTU0wgQ0EgMzCCASIw
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lrlcinQfkioq8hLIt2hUtVhBgUBoBhpPhSn7tU08D08/QJYbzqjMXjX/ZJj1dd10
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Y29tMEMGCCsGAQUFBzAChjdodHRwOi8vY2FjZXJ0cy5kaWdpY2VydC5jb20vRGln
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SURSb290Q0EuY3JsMD0GA1UdIAQ2MDQwMgYEVR0gADAqMCgGCCsGAQUFBwIBFhxo
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WYsamM6/xvLYMDX/6W9doK867mZTrqqMaci+mqege9iCSzMTyAfzd9fzZM2eY/lC
J1OuEDOJcjcV8b73HjWizsMt8tey5gvHacDlH198aZt+ziYaM0TDuncFO7pdP0GJ
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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
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-----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 = </etc/pki/dovecot/certs/mail_new_domain-chained.cert
> > ssl_cipher_list = DHE-RSA-AES256-SHA:DHE-RSA-AES128-
> > SHA:ALL:!LOW:!SSLv2:!EXP:!aNULL:!MD5:!RC4:!DES:!3DES:!TLSv1
> >
> > ssl_key = </etc/pki/dovecot/private/mail_new_domain.key
> > ssl_protocols = !SSLv2 !SSLv3
> >
> > ...
> >
> > # set alternativ cert for old domain
> > local_name mail.old.domain {
> > ssl_cert = </etc/pki/dovecot/certs/mail_old_domain-chained.cert
> > ssl_key = </etc/pki/dovecot/private/mail_old_domain.key
> > }
> > local_name imap.old.domain {
> > ssl_cert = </etc/pki/dovecot/certs/mail_old_domain-chained.cert
> > ssl_key = </etc/pki/dovecot/private/mail_old_domain.key
> > }
> > local_name pop.old.domain {
> > ssl_cert = </etc/pki/dovecot/certs/mail_old_domain-chained.cert
> > ssl_key = </etc/pki/dovecot/private/mail_old_domain.key
> > }
> >
> > # set explicit cert for new domain
> > local_name mail.new.domain {
> > ssl_cert = </etc/pki/dovecot/certs/mail_new_domain-chained.cert
> > ssl_key = </etc/pki/dovecot/private/mail_new_doman.key
> > }
> > local_name imap.new.domain {
> > ssl_cert = </etc/pki/dovecot/certs/mail_new_domain-chained.cert
> > ssl_key = </etc/pki/dovecot/private/mail_new_domain.key
> > }
> > local_name pop.new.domain {
> > ssl_cert = </etc/pki/dovecot/certs/mail_new_domain-chained.cert
> > ssl_key = </etc/pki/dovecot/private/mail_new_domain.key
> > }
> >
> >
> >
>
>
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