Try adding auth_debug_password=yes

Aki

We have FreeBSD-server with dovecot installed on it as IMAP-server. My user and password database is a text file with plaintext passwords. Clients connect to imap-server via TLS protocol and plaintext password. All works fine. But I want to configure ability to authorize with a client certificates. I have generated a client certificate and imported it to email-client. Also I have configured dovecot to verify client certificates. But email-client cannot authorize: Password mismatch. Why dovecot reject my password in this case? Please help!

My log:

dovecot: imap-login: Valid certificate: /C=UA/ST=Kyiv/L=Kyiv/O=Contoso Ltd: user=<>, rip=10.1.1.59, lip=10.1.1.99, TLS handshaking, session=<fp5P5SBkhtMKAQE7>

dovecot: imap-login: Valid certificate: /C=UA/ST=Kyiv/O=Contoso Ltd/OU=IT/CN=sysadmin/emailAddress=sysadmin@contoso.ua: user=<>, rip=10.1.1.59, lip=10.1.1.99, TLS handshaking, session=<fp5P5SBkhtMKAQE7>

dovecot: auth: passwd-file(sysadmin,10.1.1.59,<fp5P5SBkhtMKAQE7>): Password mismatch

dovecot: imap-login: Disconnected (auth failed, 1 attempts in 6 secs): user=<sysadmin>, method=EXTERNAL, rip=10.1.1.59, lip=10.1.1.99, TLS, session=<fp5P5SBkhtMKAQE7>

My configuration:

# 2.2.24 (a82c823): /usr/local/etc/dovecot/dovecot.conf

# OS: FreeBSD 10.2-RELEASE-p20 amd64  ufs

auth_debug = yes

auth_mechanisms = plain login external

auth_ssl_require_client_cert = yes

auth_ssl_username_from_cert = yes

auth_username_format = %Ln

auth_verbose = yes

disable_plaintext_auth = no

lda_mailbox_autocreate = yes

mail_debug = yes

mail_gid = 999

mail_location = maildir:/mnt/mail/%n

mail_uid = 999

namespace inbox {

  inbox = yes

  location =

  mailbox Drafts {

    special_use = \Drafts

  }

  mailbox Junk {

    special_use = \Junk

  }

  mailbox Sent {

    special_use = \Sent

  }

  mailbox "Sent Messages" {

    special_use = \Sent

  }

  mailbox Trash {

    special_use = \Trash

  }

  prefix =

}

passdb {

  args = /usr/local/etc/dovecot/users

  driver = passwd-file

}

protocols = imap pop3

service auth {

  unix_listener /var/spool/postfix/private/auth {

    group = postfix

    mode = 0660

    user = postfix

  }

  unix_listener auth-userdb {

    group = vmail

    mode = 0660

    user = vmail

  }

}

service imap-login {

  inet_listener imaps {

    ssl = yes

  }

}

ssl_ca = </etc/ssl/cacert.pem

ssl_cert = </etc/ssl/certs/dovecot.pem

ssl_dh_parameters_length = 2048

ssl_key = </etc/ssl/private/dovecot.pem

ssl_prefer_server_ciphers = yes

ssl_protocols = !SSLv2 !SSLv3 !TLSv1

ssl_require_crl = no

ssl_verify_client_cert = yes

userdb {

  args = /usr/local/etc/dovecot/users

  driver = passwd-file

}

verbose_ssl = yes