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Baljeet Bhinder

2023-Jan-08 16:55 UTC

Dovecot - mail_crypt - lmtp-server - no password to decrypt the key

I have been using postfix+dovecot successfully for a while now until I 
tried mail crypt plugin lately. I tried what is describe here 
https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/ and I 
went for global-keys as described here: 
https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/#global-keys
/"A good solution for environments where no user folder sharing is 
needed is to generate per-user EC key pair and encrypt that with 
something derived from user?s password."/

I am setting mail_crypt_global_private_key, 
mail_crypt_global_public_key, mail_crypt_save_version from user_query 
and userdb_mail_crypt_global_private_key_password from password_query. 
mail_crypt seems to work fine in imap (I saved a message as draft and it 
is stored encrypted on the disk), but lmtp complains about 
"mail_crypt_global_private_key_password unset, no password to decrypt 
the key" As you can see below in logs that it was able to set all other 
mail_crypt_ configurations successfully from user_query. However, the 
password is provided via password_query and I assume lmtp does not read 
password_query. How else can I provide a password in lmtp? Is my 
approach correct to begin with?

-- Dovecot Configurations --
# using doveconf -n
# 2.3.19.1 (9b53102964): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.19 (4eae2f79)
# OS: Linux 5.15.0-57-generic x86_64 Ubuntu 20.04.5 LTS
# Hostname: mailserver-dovecot-7c9ff7b94b-8ldrr
auth_mechanisms = plain login
auth_verbose = yes
auth_verbose_passwords = yes
debug_log_path = /dev/stdout
haproxy_trusted_networks = 192.168.0.0/16 10.10.10.0/24 10.10.30.0/24 
172.17.0.1/16
hostname = imap.mailserver.k8s.local pop.mailserver.k8s.local
info_log_path = /dev/stdout
listen = *
log_path = /dev/stdout
mail_debug = yes
mail_gid = 1000
mail_home = /var/vmail/mailboxes/%d/%n
mail_location = maildir:~/:LAYOUT=fs
mail_plugins = quota mail_crypt
mail_privileged_group = mail
mail_uid = 1000
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope 
encoded-character vacation subaddress comparator-i;ascii-numeric 
relational regex imap4flags copy include variables body enotify 
environment mailbox date index ihave duplicate mime foreverypart 
extracttext imapsieve vnd.dovecot.imapsieve
namespace inbox {
 ? inbox = yes
 ? location  ? mailbox Drafts {
 ??? auto = subscribe
 ??? special_use = \Drafts
 ? }
 ? mailbox Sent {
 ??? auto = subscribe
 ??? special_use = \Sent
 ? }
 ? mailbox "Sent Messages" {
 ??? special_use = \Sent
 ? }
 ? mailbox Spam {
 ??? auto = subscribe
 ??? autoexpunge = 30 days
 ??? special_use = \Junk
 ? }
 ? mailbox Trash {
 ??? auto = subscribe
 ??? autoexpunge = 30 days
 ??? special_use = \Trash
 ? }
 ? prefix }
passdb {
 ? args = /etc/dovecot/dovecot-sql.conf.ext
 ? driver = sql
}
plugin {
 ? imapsieve_mailbox1_before = file:/var/vmail/sieve/global/learn-spam.sieve
 ? imapsieve_mailbox1_causes = COPY APPEND FLAG
 ? imapsieve_mailbox1_name = Spam
 ? imapsieve_mailbox2_before = file:/var/vmail/sieve/global/learn-ham.sieve
 ? imapsieve_mailbox2_causes = COPY APPEND FLAG
 ? imapsieve_mailbox2_from = Spam
 ? imapsieve_mailbox2_name = *
 ? mail_crypt_save_version = 0
 ? quota = maildir:User quota
 ? quota_exceeded_message = User %u has exhausted allowed storage space.
 ? quota_rule = Junk:ignore
 ? quota_rule2 = Trash:storage=+100M
 ? quota_warning = storage=90%% quota-warning 90 %u %d
 ? quota_warning2 = storage=80%% quota-warning 80 %u %d
 ? sieve = file:~/sieve;active=~/.dovecot.sieve
 ? sieve_before = /var/vmail/sieve/global/spam-global.sieve
 ? sieve_global = /var/vmail/sieve/global/
 ? sieve_global_extensions = +vnd.dovecot.pipe +vnd.dovecot.debug
 ? sieve_pipe_bin_dir = /var/vmail/sieve/global
 ? sieve_plugins = sieve_imapsieve sieve_extprograms
}
protocols = " imap lmtp sieve pop3"
service auth {
 ? inet_listener {
 ??? port = 25252
 ? }
}
service imap-login {
 ? inet_listener imap {
 ??? haproxy = yes
 ? }
 ? inet_listener imaps {
 ??? haproxy = yes
 ??? ssl = yes
 ? }
}
service lmtp {
 ? executable = lmtp -L
 ? inet_listener lmtp {
 ??? address = 0.0.0.0
 ??? port = 24
 ? }
}
service managesieve-login {
 ? inet_listener sieve {
 ??? port = 4190
 ? }
}
service pop3-login {
 ? inet_listener pop3 {
 ??? haproxy = yes
 ? }
 ? inet_listener pop3s {
 ??? haproxy = yes
 ? }
}
ssl = required
ssl_cert = </etc/dovecot/certs/tls.crt
ssl_client_ca_dir = /etc/ssl/certs
ssl_key = # hidden, use -P to show it
ssl_prefer_server_ciphers = yes
userdb {
 ? args = /etc/dovecot/dovecot-sql.conf.ext
 ? driver = sql
}
protocol lmtp {
 ? info_log_path = /dev/stdout
 ? log_path = /dev/stdout
 ? mail_plugins = quota mail_crypt sieve
 ? postmaster_address = <hidden>
}
protocol imap {
 ? mail_plugins = quota mail_crypt quota imap_quota imap_sieve
}
-- Dovecot Configurations Ends --

-- Password Query --
password_query = \
 ??? SELECT username, domain, password, \
 ??? '%{sha256:password}' AS
userdb_mail_crypt_global_private_key_password \
 ??? FROM mailbox \
 ??? WHERE username='%u';
-- Password Query Ends--

-- User Query --
user_query = SELECT CONCAT('*:bytes=', 1024) as quota_rule, \
 ??? private_key AS mail_crypt_global_private_key, \
 ??? public_key AS mail_crypt_global_public_key, \
 ??? mail_crypt_save_version AS mail_crypt_save_version \
 ??? FROM mailbox \
 ??? WHERE username='%u';
-- User Query Ends --

-- Debug Logs --
--- Load Inbox ---
imap-login: Info: Login: user=<someone at example.com>, method=PLAIN, 
rip=192.168.49.1, lip=192.168.49.2, mpid=241, TLS, 
session=<oaoI9sLxVKXAqDEB>
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: Loading
modules
from directory: /usr/lib/dovecot/modules
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: Module
loaded:
/usr/lib/dovecot/modules/lib10_mail_crypt_plugin.so
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: Module
loaded:
/usr/lib/dovecot/modules/lib10_quota_plugin.so
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: Module
loaded:
/usr/lib/dovecot/modules/lib11_imap_quota_plugin.so
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: Module
loaded:
/usr/lib/dovecot/modules/lib95_imap_sieve_plugin.so
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: Added
userdb
setting: plugin/mail_crypt_global_private_key=LS0tLS1CRUd.....LS0tLS0K
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: Added
userdb
setting: plugin/mail_crypt_global_private_key_password=<hidden>
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: Added
userdb
setting: plugin/mail_crypt_global_public_key=LS0tLS1CRUd.....LS0tCg=imap(someone
at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: Added userdb
setting: plugin/mail_crypt_save_version=2
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: Added
userdb
setting: plugin/quota_rule=*:bytes=1024000000
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug:
Effective
uid=1000, gid=1000, home=/var/vmail/mailboxes/example.com/someone
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: 
mail_crypt_plugin: mail_crypt_curve setting missing - generating EC keys 
disabled
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: Quota
root:
name=User quota backend=maildir argsimap(someone at
example.com)<241><oaoI9sLxVKXAqDEB>: Debug: Quota rule:
root=User quota mailbox=* bytes=1024000000 messages=0
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: Quota
rule:
root=User quota mailbox=Trash bytes=+104857600 messages=0
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: Quota
warning:
bytes=921600000 (90%) messages=0 reverse=no command=quota-warning 90 
someone at example.com example.com
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: Quota
warning:
bytes=819200000 (80%) messages=0 reverse=no command=quota-warning 80 
someone at example.com example.com
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: Quota
grace:
root=User quota bytes=102400000 (10%)
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: 
open(/proc/self/io) failed: Permission denied
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug:
Namespace
inbox: type=private, prefix=, sep=, inbox=yes, hidden=no, list=yes, 
subscriptions=yes location=maildir:~/:LAYOUT=fs
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: fs: 
root=/var/vmail/mailboxes/example.com/someone, index=, indexpvt=, 
control=, inbox=/var/vmail/mailboxes/example.com/someone, altimap(someone at
example.com)<241><oaoI9sLxVKXAqDEB>: Debug: quota:
quota_over_flag check: quota_over_script unset - skipping
imap(someone at example.com)<241><oaoI9sLxVKXAqDEB>: Debug: Mailbox
INBOX:
Mailbox opened
--- Load Inbox Ends ---
--- Lmtp ---
lmtp(248): Info: Connect from 172.17.0.1
lmtp(someone at example.com)<248><e2dcD6TuumP4AAAALzF/Qw>: Debug: 
auth-master: userdb lookup(someone at example.com): Started userdb lookup
lmtp(someone at example.com)<248><e2dcD6TuumP4AAAALzF/Qw>: Debug: 
auth-master: conn unix:/var/run/dovecot/auth-userdb: Connecting
lmtp(someone at example.com)<248><e2dcD6TuumP4AAAALzF/Qw>: Debug: 
auth-master: conn unix:/var/run/dovecot/auth-userdb (pid=143,uid=0): 
Client connected (fd=18)
imap(someone at example.com)<247><WlggG8PxEOvAqDEB>: Debug: Mailbox
Sent:
Purging (new file_seq=1673195172): creating cache
imap(someone at example.com)<247><WlggG8PxEOvAqDEB>: Debug: Mailbox
Sent:
Purging finished, file_seq changed 0 -> 1673195172, size=0 -> 388,
max_uid=0
lmtp(someone at example.com)<248><e2dcD6TuumP4AAAALzF/Qw>: Debug: 
auth-master: userdb lookup(someone at example.com): auth USER input: 
someone at example.com quota_rule=*:bytes=1024000000 
mail_crypt_global_private_key=LS0tLS1CRUd.....LS0tLS0K 
mail_crypt_global_public_key=LS0tLS1CRUd.....LS0tCg== 
mail_crypt_save_version=2
lmtp(someone at example.com)<248><e2dcD6TuumP4AAAALzF/Qw>: Debug: 
auth-master: userdb lookup(someone at example.com): Finished userdb lookup 
(username=someone at example.com quota_rule=*:bytes=1024000000 
mail_crypt_global_private_key=LS0tLS1CRUd.....LS0tLS0K 
mail_crypt_global_public_key=LS0tLS1CRUd.....LS0tCg== 
mail_crypt_save_version=2)
lmtp(someone at example.com)<248><e2dcD6TuumP4AAAALzF/Qw>: Debug: 
lmtp-server: conn 172.17.0.1:6376 [1]: rcpt someone at example.com: Added 
userdb setting: 
plugin/mail_crypt_global_private_key=LS0tLS1CRUd.....LS0tLS0K
imap(someone at example.com)<247><WlggG8PxEOvAqDEB>: Debug:
duplicate db:
Initialize
lmtp(someone at example.com)<248><e2dcD6TuumP4AAAALzF/Qw>: Debug: 
lmtp-server: conn 172.17.0.1:6376 [1]: rcpt someone at example.com: Added 
userdb setting:
plugin/mail_crypt_global_public_key=LS0tLS1CRUd.....LS0tCg=imap(someone at
example.com)<247><WlggG8PxEOvAqDEB>: Debug: sieve:
Pigeonhole version 0.5.19 (4eae2f79) initializing
lmtp(someone at example.com)<248><e2dcD6TuumP4AAAALzF/Qw>: Debug: 
lmtp-server: conn 172.17.0.1:6376 [1]: rcpt someone at example.com: Added 
userdb setting: plugin/mail_crypt_save_version=2
lmtp(someone at example.com)<248><e2dcD6TuumP4AAAALzF/Qw>: Debug: 
lmtp-server: conn 172.17.0.1:6376 [1]: rcpt someone at example.com: Added 
userdb setting: plugin/quota_rule=*:bytes=1024000000
lmtp(someone at example.com)<248><e2dcD6TuumP4AAAALzF/Qw>: Debug: 
lmtp-server: conn 172.17.0.1:6376 [1]: rcpt someone at example.com: 
Effective uid=1000, gid=1000, home=/var/vmail/mailboxes/example.com/someone
lmtp(someone at example.com)<248><e2dcD6TuumP4AAAALzF/Qw>: Debug: 
lmtp-server: conn 172.17.0.1:6376 [1]: rcpt someone at example.com: 
mail_crypt_plugin: mail_crypt_curve setting missing - generating EC keys 
disabled
lmtp(someone at example.com)<248><e2dcD6TuumP4AAAALzF/Qw>: Debug: 
lmtp-server: conn 172.17.0.1:6376 [1]: rcpt someone at example.com: Quota 
root: name=User quota backend=maildir argslmtp(someone at
example.com)<248><e2dcD6TuumP4AAAALzF/Qw>: Debug:
lmtp-server: conn 172.17.0.1:6376 [1]: rcpt someone at example.com: Quota 
rule: root=User quota mailbox=* bytes=1024000000 messages=0
lmtp(someone at example.com)<248><e2dcD6TuumP4AAAALzF/Qw>: Debug: 
lmtp-server: conn 172.17.0.1:6376 [1]: rcpt someone at example.com: Quota 
rule: root=User quota mailbox=Trash bytes=+104857600 messages=0
lmtp(someone at example.com)<248><e2dcD6TuumP4AAAALzF/Qw>: Debug: 
lmtp-server: conn 172.17.0.1:6376 [1]: rcpt someone at example.com: Quota 
warning: bytes=921600000 (90%) messages=0 reverse=no 
command=quota-warning 90 someone at example.com example.com
lmtp(someone at example.com)<248><e2dcD6TuumP4AAAALzF/Qw>: Debug: 
lmtp-server: conn 172.17.0.1:6376 [1]: rcpt someone at example.com: Quota 
warning: bytes=819200000 (80%) messages=0 reverse=no 
command=quota-warning 80 someone at example.com example.com
lmtp(someone at example.com)<248><e2dcD6TuumP4AAAALzF/Qw>: Debug: 
lmtp-server: conn 172.17.0.1:6376 [1]: rcpt someone at example.com: Quota 
grace: root=User quota bytes=102400000 (10%)
lmtp(248): Error: lmtp-server: conn 172.17.0.1:6376 [1]: rcpt 
someone at example.com: Failed to initialize user: mail_crypt_plugin: 
mail_crypt_global_private_key: mail_crypt_global_private_key_password 
unset, no password to decrypt the key
lmtp(248): Info: Disconnect from 172.17.0.1: Logged out (state=READY)
--- Lmtp Ends ---
-- Debug Logs Ends --

Thanks
Baljeet Bhinder
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Aki Tuomi

2023-Jan-09 13:00 UTC

head link

Dovecot - mail_crypt - lmtp-server - no password to decrypt the key

> On 08/01/2023 18:55 EET Baljeet Bhinder <contact at
baljeetbhinder.ca> wrote:
> 
> 
> I have been using postfix+dovecot successfully for a while now until I
tried mail crypt plugin lately. I tried what is describe here
https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/ and I went for
global-keys as described here:
https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/#global-keys
>  "A good solution for environments where no user folder sharing is
needed is to generate per-user EC key pair and encrypt that with something
derived from user?s password."
>  
>  I am setting mail_crypt_global_private_key, mail_crypt_global_public_key,
mail_crypt_save_version from user_query and
userdb_mail_crypt_global_private_key_password from password_query. mail_crypt
seems to work fine in imap (I saved a message as draft and it is stored
encrypted on the disk), but lmtp complains about
"mail_crypt_global_private_key_password unset, no password to decrypt the
key" As you can see below in logs that it was able to set all other
mail_crypt_ configurations successfully from user_query. However, the password
is provided via password_query and I assume lmtp does not read password_query.
How else can I provide a password in lmtp? Is my approach correct to begin with?
Hi!

Problem with user-password derivation is that what you've ran into. Some
features, like quota or FTS, might need to access user's mail without being
able to access the password, because it's not available.

If you run into these, the only thing you can do is to not use conflicting
features. Using user's password as the encryption key is very tricky thing
to get working right.
> 
> Thanks
>  Baljeet Bhinder
>
Regards,
Aki

contact at baljeetbhinder.ca

2023-Jan-09 15:01 UTC

head link

Dovecot - mail_crypt - lmtp-server - no password to decrypt the key

Thanks for the heads up about plugins Aki. I have disabled quota and sieve
plugins and I don't think I have enabled fts. (if it is  enabled by default,
can you point me to configuration about how to disable it? I have tried this
https://doc.dovecot.org/configuration_manual/fts/ and not able to find a flag to
turn off.) But the error seems to persist.

---- Dovecot Configs ----
# 2.3.19.1 (9b53102964): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.19 (4eae2f79)
# OS: Linux 5.15.0-57-generic x86_64 Ubuntu 20.04.5 LTS 
# Hostname: mailserver-dovecot-7c9ff7b94b-h4r8m
auth_mechanisms = plain login
auth_verbose = yes
auth_verbose_passwords = yes
debug_log_path = /dev/stdout
haproxy_trusted_networks = 192.168.0.0/16 10.10.10.0/24 10.10.30.0/24
172.17.0.1/16
hostname = imap.mailserver.k8s.local pop.mailserver.k8s.local
info_log_path = /dev/stdout
listen = *
log_path = /dev/stdout
mail_debug = yes
mail_gid = 1000
mail_home = /var/vmail/mailboxes/%d/%n
mail_location = maildir:~/:LAYOUT=fs
mail_plugins = mail_crypt
mail_privileged_group = mail
mail_uid = 1000
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character
vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy
include variables body enotify environment mailbox date index ihave duplicate
mime foreverypart extracttext imapsieve vnd.dovecot.imapsieve
namespace inbox {
  inbox = yes
  location = 
  mailbox Drafts {
    auto = subscribe
    special_use = \Drafts
  }
  mailbox Sent {
    auto = subscribe
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Spam {
    auto = subscribe
    autoexpunge = 30 days
    special_use = \Junk
  }
  mailbox Trash {
    auto = subscribe
    autoexpunge = 30 days
    special_use = \Trash
  }
  prefix = 
}
passdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
plugin {
  imapsieve_mailbox1_before = file:/var/vmail/sieve/global/learn-spam.sieve
  imapsieve_mailbox1_causes = COPY APPEND FLAG
  imapsieve_mailbox1_name = Spam
  imapsieve_mailbox2_before = file:/var/vmail/sieve/global/learn-ham.sieve
  imapsieve_mailbox2_causes = COPY APPEND FLAG
  imapsieve_mailbox2_from = Spam
  imapsieve_mailbox2_name = *
  mail_crypt_save_version = 0
  quota = maildir:User quota
  quota_exceeded_message = User %u has exhausted allowed storage space.
  quota_rule = Junk:ignore
  quota_rule2 = Trash:storage=+100M
  quota_warning = storage=90%% quota-warning 90 %u %d
  quota_warning2 = storage=80%% quota-warning 80 %u %d
  sieve = file:~/sieve;active=~/.dovecot.sieve
  sieve_before = /var/vmail/sieve/global/spam-global.sieve
  sieve_global = /var/vmail/sieve/global/
  sieve_global_extensions = +vnd.dovecot.pipe +vnd.dovecot.debug
  sieve_pipe_bin_dir = /var/vmail/sieve/global
  sieve_plugins = sieve_imapsieve sieve_extprograms
}
protocols = " imap lmtp sieve pop3"
service auth {
  inet_listener {
    port = 25252
  }
}
service imap-login {
  inet_listener imap {
    haproxy = yes
  }
  inet_listener imaps {
    haproxy = yes
    ssl = yes
  }
}
service lmtp {
  executable = lmtp -L
  inet_listener lmtp {
    address = 0.0.0.0
    port = 24
  }
}
service managesieve-login {
  inet_listener sieve {
    port = 4190
  }
}
service pop3-login {
  inet_listener pop3 {
    haproxy = yes
  }
  inet_listener pop3s {
    haproxy = yes
  }
}
ssl = required
ssl_cert = </etc/dovecot/certs/tls.crt
ssl_client_ca_dir = /etc/ssl/certs
ssl_key = # hidden, use -P to show it
ssl_prefer_server_ciphers = yes
userdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
protocol lmtp {
  info_log_path = /dev/stdout
  log_path = /dev/stdout
  mail_plugins = mail_crypt
  postmaster_address = contact at baljeetbhinder.ca
}
protocol imap {
  mail_plugins = mail_crypt quota imap_quota imap_sieve
}
---- Dovecot Configs Ends ----

---- Lmtp Log ----
lmtp(273): Info: Connect from 172.17.0.1
lmtp(someone at example.com)<273><e0AjL8EovGMRAQAAR5uF9w>: Debug:
auth-master: userdb lookup(someone at example.com): Started userdb lookup
lmtp(someone at example.com)<273><e0AjL8EovGMRAQAAR5uF9w>: Debug:
auth-master: conn unix:/var/run/dovecot/auth-userdb: Connecting
lmtp(someone at example.com)<273><e0AjL8EovGMRAQAAR5uF9w>: Debug:
auth-master: conn unix:/var/run/dovecot/auth-userdb (pid=144,uid=0): Client
connected (fd=18)
lmtp(someone at example.com)<273><e0AjL8EovGMRAQAAR5uF9w>: Debug:
auth-master: userdb lookup(someone at example.com): auth USER input: someone at
example.com quota_rule=*:bytes=1024000000
mail_crypt_global_private_key=LS0tLS1CRUd.....LS0tLS0K
mail_crypt_global_public_key=LS0tLS1CRUd.....LS0tCg== mail_crypt_save_version=2
lmtp(someone at example.com)<273><e0AjL8EovGMRAQAAR5uF9w>: Debug:
auth-master: userdb lookup(someone at example.com): Finished userdb lookup
(username=someone at example.com quota_rule=*:bytes=1024000000
mail_crypt_global_private_key=LS0tLS1CRUd.....LS0tLS0K
mail_crypt_global_public_key=LS0tLS1CRUd.....LS0tCg== mail_crypt_save_version=2)
lmtp(someone at example.com)<273><e0AjL8EovGMRAQAAR5uF9w>: Debug:
lmtp-server: conn 172.17.0.1:62376 [1]: rcpt someone at example.com: Added
userdb setting: plugin/mail_crypt_global_private_key=LS0tLS1CRUd.....LS0tLS0K
lmtp(someone at example.com)<273><e0AjL8EovGMRAQAAR5uF9w>: Debug:
lmtp-server: conn 172.17.0.1:62376 [1]: rcpt someone at example.com: Added
userdb setting:
plugin/mail_crypt_global_public_key=LS0tLS1CRUd.....LS0tCg=lmtp(someone at
example.com)<273><e0AjL8EovGMRAQAAR5uF9w>: Debug: lmtp-server: conn
172.17.0.1:62376 [1]: rcpt someone at example.com: Added userdb setting:
plugin/mail_crypt_save_version=2
lmtp(someone at example.com)<273><e0AjL8EovGMRAQAAR5uF9w>: Debug:
lmtp-server: conn 172.17.0.1:62376 [1]: rcpt someone at example.com: Added
userdb setting: plugin/quota_rule=*:bytes=1024000000
lmtp(someone at example.com)<273><e0AjL8EovGMRAQAAR5uF9w>: Debug:
lmtp-server: conn 172.17.0.1:62376 [1]: rcpt someone at example.com: Effective
uid=1000, gid=1000, home=/var/vmail/mailboxes/example.com/someone
lmtp(someone at example.com)<273><e0AjL8EovGMRAQAAR5uF9w>: Debug:
lmtp-server: conn 172.17.0.1:62376 [1]: rcpt someone at example.com:
mail_crypt_plugin: mail_crypt_curve setting missing - generating EC keys
disabled
lmtp(273): Error: lmtp-server: conn 172.17.0.1:62376 [1]: rcpt someone at
example.com: Failed to initialize user: mail_crypt_plugin:
mail_crypt_global_private_key: mail_crypt_global_private_key_password unset, no
password to decrypt the key
lmtp(273): Info: Disconnect from 172.17.0.1: Logged out (state=READY)
---- Lmtp Log Ends ----

How can I tell which plugin is conflicting here?


January 9, 2023 6:00 AM, "Aki Tuomi" <aki.tuomi at
open-xchange.com> wrote:
>> On 08/01/2023 18:55 EET Baljeet Bhinder <contact at
baljeetbhinder.ca> wrote:
>> 
>> I have been using postfix+dovecot successfully for a while now until I
tried mail crypt plugin
>> lately. I tried what is describe here
>> https://doc.dovecot.org/configuration_manual/mail_crypt_plugin and I
went for global-keys as
>> described here:
https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/#global-keys
>> "A good solution for environments where no user folder sharing is
needed is to generate per-user EC
>> key pair and encrypt that with something derived from user?s
password."
>> 
>> I am setting mail_crypt_global_private_key,
mail_crypt_global_public_key, mail_crypt_save_version
>> from user_query and userdb_mail_crypt_global_private_key_password from
password_query. mail_crypt
>> seems to work fine in imap (I saved a message as draft and it is stored
encrypted on the disk), but
>> lmtp complains about "mail_crypt_global_private_key_password
unset, no password to decrypt the key"
>> As you can see below in logs that it was able to set all other
mail_crypt_ configurations
>> successfully from user_query. However, the password is provided via
password_query and I assume
>> lmtp does not read password_query. How else can I provide a password in
lmtp? Is my approach
>> correct to begin with?
> 
> Hi!
> 
> Problem with user-password derivation is that what you've ran into.
Some features, like quota or
> FTS, might need to access user's mail without being able to access the
password, because it's not
> available.
> 
> If you run into these, the only thing you can do is to not use conflicting
features. Using user's
> password as the encryption key is very tricky thing to get working right.
> 
>> Thanks
>> Baljeet Bhinder
> 
> Regards,
> Aki

Baljeet Bhinder

2023-Jan-09 15:15 UTC

head link

Dovecot - mail_crypt - lmtp-server - no password to decrypt the key

Not sure if that helps in finding conflicting plugin, but here is the success
log that saves an unencrypted mail (after disabling mail_crypt).

---- Lmtp Log ----
lmtp(314): Info: Connect from 172.17.0.1
lmtp(someone at example.com)<314><FL0GDhguvGM6AQAAR5uF9w>: Debug:
auth-master: userdb lookup(someone at example.com): Started userdb lookup
lmtp(someone at example.com)<314><FL0GDhguvGM6AQAAR5uF9w>: Debug:
auth-master: conn unix:/var/run/dovecot/auth-userdb: Connecting
lmtp(someone at example.com)<314><FL0GDhguvGM6AQAAR5uF9w>: Debug:
auth-master: conn unix:/var/run/dovecot/auth-userdb (pid=144,uid=0): Client
connected (fd=18)
lmtp(someone at example.com)<314><FL0GDhguvGM6AQAAR5uF9w>: Debug:
auth-master: userdb lookup(someone at example.com): auth USER input: someone at
example.com quota_rule=*:bytes=1024000000
mail_crypt_global_private_key=LS0tLS1CRUd.....LS0tLS0K
mail_crypt_global_public_key=LS0tLS1CRUd.....LS0tCg== mail_crypt_save_version=2
lmtp(someone at example.com)<314><FL0GDhguvGM6AQAAR5uF9w>: Debug:
auth-master: userdb lookup(someone at example.com): Finished userdb lookup
(username=someone at example.com quota_rule=*:bytes=1024000000
mail_crypt_global_private_key=LS0tLS1CRUd.....LS0tLS0K
mail_crypt_global_public_key=LS0tLS1CRUd.....LS0tCg== mail_crypt_save_version=2)
lmtp(someone at example.com)<314><FL0GDhguvGM6AQAAR5uF9w>: Debug:
lmtp-server: conn 172.17.0.1:5237 [1]: rcpt someone at example.com: Added userdb
setting: plugin/mail_crypt_global_private_key=LS0tLS1CRUd.....LS0tLS0K
lmtp(someone at example.com)<314><FL0GDhguvGM6AQAAR5uF9w>: Debug:
lmtp-server: conn 172.17.0.1:5237 [1]: rcpt someone at example.com: Added userdb
setting: plugin/mail_crypt_global_public_key=LS0tLS1CRUd.....LS0tCg=lmtp(someone
at example.com)<314><FL0GDhguvGM6AQAAR5uF9w>: Debug: lmtp-server:
conn 172.17.0.1:5237 [1]: rcpt someone at example.com: Added userdb setting:
plugin/mail_crypt_save_version=2
lmtp(someone at example.com)<314><FL0GDhguvGM6AQAAR5uF9w>: Debug:
lmtp-server: conn 172.17.0.1:5237 [1]: rcpt someone at example.com: Added userdb
setting: plugin/quota_rule=*:bytes=1024000000
lmtp(someone at example.com)<314><FL0GDhguvGM6AQAAR5uF9w>: Debug:
lmtp-server: conn 172.17.0.1:5237 [1]: rcpt someone at example.com: Effective
uid=1000, gid=1000, home=/var/vmail/mailboxes/example.com/someone
lmtp(someone at example.com)<314><FL0GDhguvGM6AQAAR5uF9w>: Debug:
lmtp-server: conn 172.17.0.1:5237 [1]: rcpt someone at example.com: Namespace
inbox: type=private, prefix=, sep=, inbox=yes, hidden=no, list=yes,
subscriptions=yes location=maildir:~/:LAYOUT=fs
lmtp(someone at example.com)<314><FL0GDhguvGM6AQAAR5uF9w>: Debug:
lmtp-server: conn 172.17.0.1:5237 [1]: rcpt someone at example.com: fs:
root=/var/vmail/mailboxes/example.com/someone, index=, indexpvt=, control=,
inbox=/var/vmail/mailboxes/example.com/someone, altlmtp(someone at
example.com)<314><FL0GDhguvGM6AQAAR5uF9w>: Debug: lmtp-server: conn
172.17.0.1:5237 [1]: rcpt someone at example.com: Mailbox INBOX: Mailbox opened
lmtp(someone at example.com)<314><FL0GDhguvGM6AQAAR5uF9w>: Info:
msgid=<4e6b1652-8a1f-892f-af09-b9447dbbfcfd at example.com>: saved mail to
INBOX
lmtp(314): Debug: lmtp-server: conn 172.17.0.1:5237 [1]: rcpt someone at
example.com: User session is finished
lmtp(314): Info: Disconnect from 172.17.0.1: Logged out (state=READY)
---- Lmtp Log Ends ----


January 9, 2023 6:00 AM, "Aki Tuomi" <aki.tuomi at
open-xchange.com> wrote:
>> On 08/01/2023 18:55 EET Baljeet Bhinder <contact at
baljeetbhinder.ca> wrote:
>> 
>> I have been using postfix+dovecot successfully for a while now until I
tried mail crypt plugin
>> lately. I tried what is describe here
>> https://doc.dovecot.org/configuration_manual/mail_crypt_plugin and I
went for global-keys as
>> described here:
https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/#global-keys
>> "A good solution for environments where no user folder sharing is
needed is to generate per-user EC
>> key pair and encrypt that with something derived from user?s
password."
>> 
>> I am setting mail_crypt_global_private_key,
mail_crypt_global_public_key, mail_crypt_save_version
>> from user_query and userdb_mail_crypt_global_private_key_password from
password_query. mail_crypt
>> seems to work fine in imap (I saved a message as draft and it is stored
encrypted on the disk), but
>> lmtp complains about "mail_crypt_global_private_key_password
unset, no password to decrypt the key"
>> As you can see below in logs that it was able to set all other
mail_crypt_ configurations
>> successfully from user_query. However, the password is provided via
password_query and I assume
>> lmtp does not read password_query. How else can I provide a password in
lmtp? Is my approach
>> correct to begin with?
> 
> Hi!
> 
> Problem with user-password derivation is that what you've ran into.
Some features, like quota or
> FTS, might need to access user's mail without being able to access the
password, because it's not
> available.
> 
> If you run into these, the only thing you can do is to not use conflicting
features. Using user's
> password as the encryption key is very tricky thing to get working right.
> 
>> Thanks
>> Baljeet Bhinder
> 
> Regards,
> Aki

Thanks,
Baljeet Bhinder

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