Dovecot Master User: Access user's mailbox without owner's password

14 Nov 2019 · *my_master_user@not-exist.com I see in the log, that it seems to ignore the master-user (*


      Hi, I hope you're all right. I describe below the scenario where the
problem occurs.
I'm trying to activate a master user [1] to be able to access all the
boxes of all users by imap.
I have configured the dovecot-master-users [2] file with the
appropriate permissions.
When I try to access, for example with roundcube, through
user@mydomain.com*my_master_user@not-exist.com
I see in the log, that it seems to ignore the master-user (*) and
tries to authenticate the Active Directory but with the master user's
password. Then it shows in the log the messages
auth: Info: ldap(user@mydomain.com,127.0.0.1,<6sFGXE6XLwB/AAAB> )
invalid credentials
auth: Debug: client passdb out: FAIL 1 user=user@mydomain.com
I have other test cases, but I need to validate the master user login that way.
I would appreciate any comments you can make and I am waiting to
answer any questions.
Regards,
[1] https://doc.dovecot.org/configuration_manual/authentication/master_users/
[2] https://docs.iredmail.org/dovecot.master.user.html

root@mail-01:/etc/dovecot# cat /etc/issue
Ubuntu 14.04.5 LTS \n \l
root@mail-01:/etc/dovecot# dpkg -l | grep dovecot | awk {'print $2" "$3'}
dovecot-core 1:2.2.9-1ubuntu2.6
dovecot-imapd 1:2.2.9-1ubuntu2.6
dovecot-ldap 1:2.2.9-1ubuntu2.6
dovecot-lmtpd 1:2.2.9-1ubuntu2.6
dovecot-managesieved 1:2.2.9-1ubuntu2.6
dovecot-mysql 1:2.2.9-1ubuntu2.6
dovecot-pop3d 1:2.2.9-1ubuntu2.6
dovecot-sieve 1:2.2.9-1ubuntu2.6
root@mail-01:/etc/dovecot# cat dovecot.conf | grep -v '#' | grep -v -e
'^$' | sed  "s/REALDOMAIN/mydomain/g"
listen = * [::]
mail_plugins = quota mailbox_alias acl
protocols = pop3 imap sieve lmtp
mail_uid = 2000
mail_gid = 2000
first_valid_uid = 2000
last_valid_uid = 2000
log_path = /var/log/dovecot.log
auth_verbose = yes
auth_debug = yes
ssl_protocols = !SSLv2 !SSLv3
ssl = required
verbose_ssl = no
ssl_ca = </etc/ssl/certs/mydomain.com.ca-bundle
ssl_cert = </etc/ssl/certs/mydomain.com.crt
ssl_key = </etc/ssl/private/mydomain.com.key
ssl_cipher_list =
ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:ECDHE-RSA-DES-CBC3-SHA:ECDHE-ECDSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA
ssl_dh_parameters_length = 2048
ssl_prefer_server_ciphers = yes
disable_plaintext_auth = no
mail_location = maildir:%Lh/Maildir/:INDEX=%Lh/Maildir/
auth_default_realm = mydomain.com
auth_mechanisms = PLAIN LOGIN
service auth {
unix_listener /var/spool/postfix/private/dovecot-auth {
user = postfix
group = postfix
mode = 0666
}
unix_listener auth-master {
user = vmail
group = vmail
mode = 0666
}
unix_listener auth-userdb {
user = vmail
group = vmail
mode = 0660
}
}
service lmtp {
user = vmail
process_min_avail = 5
executable = lmtp -L
unix_listener /var/spool/postfix/private/dovecot-lmtp {
user = postfix
group = postfix
mode = 0600
}
inet_listener lmtp {
address = 127.0.0.1
port = 24
}
}
auth_master_user_separator = *
passdb {
driver = passwd-file
args = /etc/dovecot/dovecot-master-users
master = yes
}
userdb {
args = /etc/dovecot/dovecot-ldap.conf
driver = ldap
}
passdb {
args = /etc/dovecot/dovecot-ldap.conf
driver = ldap
}
plugin {
auth_socket_path = /var/run/dovecot/auth-master
quota = dict:user::proxy::quotadict
quota_rule = *:storage=3G
quota_warning = storage=100%% quota-warning 100 %u
quota_warning2 = storage=95%% quota-warning 95 %u
quota_warning3 = storage=90%% quota-warning 90 %u
quota_warning4 = storage=85%% quota-warning 85 %u
quota_grace = 10%%
acl = vfile
acl_shared_dict = proxy::acl
sieve_dir = %Lh/sieve
sieve = %Lh/sieve/dovecot.sieve
sieve_global_dir = /var/vmail/sieve
sieve_before = /var/vmail/sieve/dovecot.sieve
mailbox_alias_old = Sent
mailbox_alias_new = Sent Messages
mailbox_alias_old2 = Sent
mailbox_alias_new2 = Sent Items
}
service quota-warning {
executable = script /usr/local/bin/dovecot-quota-warning.sh
unix_listener quota-warning {
user = vmail
group = vmail
mode = 0660
}
}
service dict {
unix_listener dict {
mode = 0660
user = vmail
group = vmail
}
}
dict {
quotadict = mysql:/etc/dovecot/dovecot-used-quota.conf
acl = mysql:/etc/dovecot/dovecot-share-folder.conf
}
protocol lda {
mail_plugins = $mail_plugins sieve
auth_socket_path = /var/run/dovecot/auth-master
log_path = /var/log/dovecot-sieve.log
lda_mailbox_autocreate = yes
lda_mailbox_autosubscribe = yes
postmaster_address = it@mydomain.com
}
protocol lmtp {
info_log_path = /var/log/dovecot-lmtp.log
mail_plugins = quota sieve
postmaster_address = postmaster
lmtp_save_to_detail_mailbox = yes
recipient_delimiter = +
}
protocol imap {
mail_plugins = $mail_plugins imap_quota imap_acl
imap_client_workarounds = tb-extra-mailbox-sep
mail_max_userip_connections = 30
}
protocol pop3 {
mail_plugins = $mail_plugins
pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
pop3_uidl_format = %08Xu%08Xv
mail_max_userip_connections = 30
}
service imap-login {
service_count = 1
process_limit = 500
}
service pop3-login {
service_count = 1
}
service managesieve-login {
inet_listener sieve {
address = 127.0.0.1
port = 4190
}
}
namespace {
type = private
separator = /
prefix =
inbox = yes
mailbox Sent {
auto = subscribe
special_use = \Sent
}
mailbox "Sent Messages" {
auto = no
special_use = \Sent
}
mailbox "Sent Items" {
auto = no
special_use = \Sent
}
mailbox Drafts {
auto = subscribe
special_use = \Drafts
}
mailbox Trash {
auto = subscribe
special_use = \Trash
}
mailbox "Deleted Messages" {
auto = no
special_use = \Trash
}
mailbox Junk {
auto = subscribe
special_use = \Junk
}
mailbox Spam {
auto = no
special_use = \Junk
}
mailbox "Junk E-mail" {
auto = no
special_use = \Junk
}
mailbox Archive {
auto = subscribe
special_use = \Archive
}
mailbox Archives {
auto = no
special_use = \Archive
}
}
namespace {
type = shared
separator = /
prefix = Shared/%%u/
location = maildir:%%Lh/Maildir/:INDEX=%%Lh/Maildir/Shared/%%u
subscriptions = yes
list = children
}
root@mail-01:/etc/dovecot# cat dovecot-ldap.conf | sed
"s/realdomain/mydomain/g"
hosts           = active-directory:389
ldap_version    = 3
auth_bind       = yes
dn              = domain\vmail
dnpass          = Str0ngP4ssw0rd
base            = ou=Organizational Unit,dc=domain,dc=com
scope           = subtree
deref           = never
user_filter     =
(&(userPrincipalName=%n@domain.com)(objectClass=person)(!(userAccountControl:1.2.840.113556.1.4.803:=2)))
pass_filter     =
(&(userPrincipalName=%n@domain.com)(objectClass=person)(!(userAccountControl:1.2.840.113556.1.4.803:=2)))
#user_filter     =
(&(mail=%u)(objectClass=person)(!(userAccountControl:1.2.840.113556.1.4.803:=2)))
#pass_filter     =
(&(mail=%u)(objectClass=person)(!(userAccountControl:1.2.840.113556.1.4.803:=2)))
pass_attrs      = userPassword=password
default_pass_scheme = CRYPT
user_attrs      = 

#=mail=master_user, 

#mail=user, 

=user=%Ln@mydomain.com, 

=home=/var/vmail/vmail1/mydomain.com/%Ln/Maildir/, 

=mail=maildir:/var/vmail/vmail1/mydomain.com/%Ln/Maildir/, 

maxStorage=quota_rule=*:bytes=%$
root@mail-01:/etc/dovecot# ls -al dovecot-master-users
-r-x------ 1 dovecot dovecot 120 Nov 13 14:45 dovecot-master-users

Dav Rdrz

Marcio Merlone

root@mail-01:/etc/dovecot# ls -al dovecot-master-users -r-x------ 1 dovecot dovecot 120 Nov 13 14:45 dovecot-master-users

John Stoffel

Marcio Merlone

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