[Dovecot] Error: imap-login: Can't connect to auth server atdefault: Resource temporarily unavailable
Matt Roman
mroman at lxdinc.com
Wed Jul 12 22:41:48 EEST 2006
Here is my /etc/dovecot.conf:
Thanks Again!!!
## Dovecot configuration file
# If you're in a hurry, see http://wiki.dovecot.org/QuickConfiguration
# '#' character and everything after it is treated as comments. Extra spaces
# and tabs are ignored. If you want to use either of these explicitly, put
the # value inside quotes, eg.: key = "# char and trailing whitespace "
# Default values are shown after each value, it's not required to uncomment
# any of the lines.
# Base directory where to store runtime data.
#base_dir = /var/run/dovecot/
# Protocols we want to be serving: imap imaps pop3 pop3s #protocols = imap
imaps pop3 pop3s
# IP or host address where to listen in for connections. It's not currently
# possible to specify multiple addresses. "*" listens in all IPv4
interfaces.
# "[::]" listens in all IPv6 interfaces, but may also listen in all IPv4 #
interfaces depending on the operating system.
#
# If you want to specify ports for each service, you will need to configure
# these settings inside the protocol imap/pop3 { ... } section, so you can #
specify different ports for IMAP/POP3. For example:
# protocol imap {
# listen = *:10143
# ssl_listen = *:10943
# ..
# }
# protocol pop3 {
# listen = *:10100
# ..
# }
#listen = [::]
# Disable LOGIN command and all other plaintext authentications unless #
SSL/TLS is used (LOGINDISABLED capability). Note that if the remote IP #
matches the local IP (ie. you're connecting from the same computer), the #
connection is considered secure and plaintext authentication is allowed.
#disable_plaintext_auth = no
# Should all IMAP and POP3 processes be killed when Dovecot master process #
shuts down. Setting this to "no" means that Dovecot can be upgraded without
# forcing existing client connections to close (although that could also be
# a problem if the upgrade is eg. because of a security fix). This however #
means that after master process has died, the client processes can't write #
to log files anymore.
#shutdown_clients = yes
##
## Logging
##
# Use this logfile instead of syslog(). /dev/stderr can be used if you want
to # use stderr for logging (ONLY /dev/stderr - otherwise it is closed).
#log_path =
log_path = /var/log/dovecot10
# For informational messages, use this logfile instead of the default
#info_log_path = info_log_path = /var/log/dovecot10-info
# Prefix for each line written to log file. % codes are in strftime(3) #
format.
#log_timestamp = "%b %d %H:%M:%S "
# Syslog facility to use if you're logging to syslog. Usually if you don't #
want to use "mail", you'll use local0..local7. Also other standard #
facilities are supported.
#syslog_facility = mail
##
## SSL settings
##
# IP or host address where to listen in for SSL connections. Defaults # to
above if not specified.
#ssl_listen =
# Disable SSL/TLS support.
#ssl_disable = no
# PEM encoded X.509 SSL/TLS certificate and private key. They're opened
before # dropping root privileges, so keep the key file unreadable by anyone
but # root. Included doc/mkcert.sh can be used to easily generate
self-signed # certificate, just make sure to update the domains in
dovecot-openssl.cnf #ssl_cert_file = /etc/pki/dovecot/certs/dovecot.pem
#ssl_key_file = /etc/pki/dovecot/private/dovecot.pem
ssl_cert_file = /etc/postfix/newcert.pem ssl_key_file = /etc/postfix/newreq.
pem
# If key file is password protected, give the password here. Alternatively #
give it when starting dovecot with -p parameter.
#ssl_key_password =
# File containing trusted SSL certificate authorities. Usually not needed.
#ssl_ca_file =
# Request client to send a certificate.
#ssl_verify_client_cert = no
# How often to regenerate the SSL parameters file. Generation is quite CPU #
intensive operation. The value is in hours, 0 disables regeneration #
entirely.
#ssl_parameters_regenerate = 168
# SSL ciphers to use
#ssl_cipher_list = ALL:!LOW
# Show protocol level SSL errors.
#verbose_ssl = no
##
## Login processes
##
# Directory where authentication process places authentication UNIX sockets
# which login needs to be able to connect to. The sockets are created when #
running as root, so you don't have to worry about permissions. Note that #
everything in this directory is deleted when Dovecot is started.
#login_dir = /var/run/dovecot/login
# chroot login process to the login_dir. Only reason not to do this is if
you # wish to run the whole Dovecot without roots.
# http://wiki.dovecot.org/Rootless
#login_chroot = yes
# User to use for the login process. Create a completely new user for this,
# and don't use it anywhere else. The user must also belong to a group where
# only it has access, it's used to control access for authentication
process.
# Note that this user is NOT used to access mails.
# http://wiki.dovecot.org/UserIds
#login_user = dovecot
# Set max. process size in megabytes. If you don't use #
login_process_per_connection you might need to grow this.
login_process_size = 32
# Should each login be processed in it's own process (yes), or should one #
login process be allowed to process multiple connections (no)? Yes is more #
secure, espcially with SSL/TLS enabled. No is faster since there's no need #
to create processes all the time.
login_process_per_connection = yes
# Number of login processes to create. If login_process_per_connection is #
yes, this is the number of extra processes waiting for users to log in.
login_processes_count = 3
# Maximum number of extra login processes to create. The extra process count
# usually stays at login_processes_count, but when multiple users start
logging # in at the same time more extra processes are created. To prevent
fork-bombing # we check only once in a second if new processes should be
created - if all # of them are used at the time, we double their amount
until limit set by this # setting is reached. This setting is used only if #
login_process_per_connection is yes.
login_max_processes_count = 128
# Maximum number of connections allowed in login state. When this limit is #
reached, the oldest connections are dropped. If login_process_per_connection
# is no, this is a per-process value, so the absolute maximum number of
users # logging in actually login_processes_count * max_logging_users.
login_max_logging_users = 256
# Greeting message for clients.
login_greeting = LXDNET IMAP READY
# Space-separated list of elements we want to log. The elements which have #
a non-empty variable value are joined together to form a comma-separated #
string.
#login_log_format_elements = user=<%u> method=%m rip=%r lip=%l %c
# Login log format. %$ contains login_log_format_elements string, %s
contains # the data we want to log.
#login_log_format = %$: %s
##
## Mailbox locations and namespaces
##
# Default MAIL environment to use when it's not set. By leaving this empty #
dovecot tries to do some automatic detection as described in #
doc/mail-storages.txt. There are a few special variables you can use, eg.:
#
# %u - username
# %n - user part in user at domain, same as %u if there's no domain
# %d - domain part in user at domain, empty if there's no domain
# %h - home directory
#
# See doc/variables.txt for full list. Some examples:
#
# default_mail_env = maildir:/var/mail/%1u/%u/Maildir
# default_mail_env = mbox:~/mail/:INBOX=/var/mail/%u
# default_mail_env = mbox:/var/mail/%d/%n/:INDEX=/var/indexes/%d/%n
#
#default_mail_env =
# If you need to set multiple mailbox locations or want to change default #
namespace settings, you can do it by defining namespace sections:
#
# You can have private, shared and public namespaces. The only difference #
between them is how Dovecot announces them to client via NAMESPACE #
extension. Shared namespaces are meant for user-owned mailboxes which are #
shared to other users, while public namespaces are for more globally #
accessible mailboxes.
#
# REMEMBER: If you add any namespaces, the default namespace must be added #
explicitly, ie. default_mail_env does nothing unless you have a namespace #
without a location setting. Default namespace is simply done by having a #
namespace with empty prefix.
#namespace private {
# Hierarchy separator to use. You should use the same separator for all
# namespaces or some clients get confused. '/' is usually a good one.
#separator = /
# Prefix required to access this namespace. This needs to be different
for
# all namespaces. For example "Public/".
#prefix =
# Physical location of the mailbox. This is in same format as
# default_mail_env, which is also the default for it.
#location =
# There can be only one INBOX, and this setting defines which namespace
# has it.
#inbox = yes
# If namespace is hidden, it's not advertised to clients via NAMESPACE
# extension or shown in LIST replies. This is mostly useful when
converting
# from another server with different namespaces which you want to
depricate
# but still keep working. For example you can create hidden namespaces
with
# prefixes "~/mail/", "~%u/mail/" and "mail/".
#hidden = yes
#}
# Grant access to these extra groups for mail processes. Typical use would
be # to give "mail" group write access to /var/mail to be able to create
dotlocks.
#mail_extra_groups =
# Allow full filesystem access to clients. There's no access checks other
than # what the operating system does for the active UID/GID. It works with
both # maildir and mboxes, allowing you to prefix mailboxes names with eg.
/path/ # or ~user/.
#mail_full_filesystem_access = no
##
## Mail processes
##
# Enable mail process debugging. This can help you figure out why Dovecot #
isn't finding your mails.
#mail_debug = no
mail_debug = yes
# Log prefix for mail processes. See doc/variables.txt for list of possible
# variables you can use.
#mail_log_prefix = "%Us(%u): "
# Use mmap() instead of read() to read mail files. read() seems to be a bit
# faster with my Linux/x86 and it's better with NFS, so that's the default.
# Note that OpenBSD 3.3 and older don't work right with mail_read_mmaped =
yes.
#mail_read_mmaped = no
# Don't use mmap() at all. This is required if you store indexes to shared #
filesystems (NFS or clustered filesystem).
#mmap_disable = no
mmap_disable = yes
# Don't write() to mmaped files. This is required for some operating systems
# which use separate caches for them, such as OpenBSD.
#mmap_no_write = no
# Locking method for index files. Alternatives are fcntl, flock and dotlock.
# Dotlocking uses some tricks which may create more disk I/O than other
locking # methods. NOTE: If you use NFS, remember to change also
mmap_disable setting!
#lock_method = fcntl
#lock_method = dotlock
# Drop all privileges before exec()ing the mail process. This is mostly #
meant for debugging, otherwise you don't get core dumps. It could be a small
# security risk if you use single UID for multiple users, as the users could
# ptrace() each others processes then.
#mail_drop_priv_before_exec = no
# Show more verbose process titles (in ps). Currently shows user name and #
IP address. Useful for seeing who are actually using the IMAP processes #
(eg. shared mailboxes or if same uid is used for multiple accounts).
#verbose_proctitle = no
# Valid UID range for users, defaults to 500 and above. This is mostly # to
make sure that users can't log in as daemons or other system users.
# Note that denying root logins is hardcoded to dovecot binary and can't #
be done even if first_valid_uid is set to 0.
#first_valid_uid = 500
#last_valid_uid = 0
# Valid GID range for users, defaults to non-root/wheel. Users having #
non-valid GID as primary group ID aren't allowed to log in. If user #
belongs to supplementary groups with non-valid GIDs, those groups are # not
set.
#first_valid_gid = 1
#last_valid_gid = 0
# Maximum number of running mail processes. When this limit is reached, #
new users aren't allowed to log in.
#max_mail_processes = 1024
# Set max. process size in megabytes. Most of the memory goes to mmap()ing #
files, so it shouldn't harm much even if this limit is set pretty high.
#mail_process_size = 256
# Maximum allowed length for mail keyword name. It's only forced when trying
# to create new keywords.
#mail_max_keyword_length = 50
# Default umask to use for mail files and directories.
#umask = 0077
# ':' separated list of directories under which chrooting is allowed for
mail # processes (ie. /var/mail will allow chrooting to /var/mail/foo/bar
too).
# This setting doesn't affect login_chroot or auth_chroot variables.
# WARNING: Never add directories here which local users can modify, that #
may lead to root exploit. Usually this should be done only if you don't #
allow shell access for users. See doc/configuration.txt for more
information.
#valid_chroot_dirs =
# Default chroot directory for mail processes. This can be overridden for #
specific users in user database by giving /./ in user's home directory #
(eg. /home/./user chroots into /home). Note that usually there is no real #
need to do chrooting, Dovecot doesn't allow users to access files outside #
their mail directory anyway.
#mail_chroot =
##
## Mailbox handling optimizations
##
# Space-separated list of fields to initially save into cache file.
Currently # these fields are allowed:
#
# flags, date.sent, date.received, size.virtual, size.physical #
mime.parts, imap.body, imap.bodystructure # # Different IMAP clients work in
different ways, so they benefit from # different cached fields. Some do not
benefit from them at all. Caching more # than necessary generates useless
disk I/O, so you don't want to do that # either.
#
# Dovecot attempts to automatically figure out what client wants and it
keeps # only that. However the first few times a mailbox is opened, Dovecot
hasn't # yet figured out what client needs, so it may not perform optimally.
If you # know what fields the majority of your clients need, it may be
useful to set # these fields by hand. If client doesn't actually use them,
Dovecot will # eventually drop them.
#
# Usually you should just leave this field alone. The potential benefits are
# typically unnoticeable.
#mail_cache_fields =
# Space-separated list of fields that Dovecot should never save to cache
file.
# Useful if you want to save disk space at the cost of more I/O when the
fields # needed.
#mail_never_cache_fields =
# The minimum number of mails in a mailbox before updates are done to cache
# file. This allows optimizing Dovecot's behavior to do less disk writes at
# the cost of more disk reads.
#mail_cache_min_mail_count = 0
# When IDLE command is running, mailbox is checked once in a while to see if
# there are any new mails or other changes. This setting defines the minimum
# time to wait between those checks. Dovecot is however able to use dnotify
# and inotify with Linux to reply immediately after the change occurs.
#mailbox_idle_check_interval = 30
# Save mails with CR+LF instead of plain LF. This makes sending those mails
# take less CPU, especially with sendfile() syscall with Linux and FreeBSD.
# But it also creates a bit more disk I/O which may just make it slower.
# Also note that if other software reads the mboxes/maildirs, they may
handle # the extra CRs wrong and cause problems.
#mail_save_crlf = no
##
## Maildir-specific settings
##
# By default LIST command returns all entries in maildir beginning with dot.
# Enabling this option makes Dovecot return only entries which are
directories.
# This is done by stat()ing each entry, so it causes more disk I/O.
# (For systems setting struct dirent->d_type, this check is free and it's #
done always regardless of this setting) #maildir_stat_dirs = no
# Copy mail to another folders using hard links. This is much faster than #
actually copying the file. This is problematic only if something modifies #
the mail in one folder but doesn't want it modified in the others. I don't #
know any MUA which would modify mail files directly. IMAP protocol also #
requires that the mails don't change, so it would be problematic in any
case.
# If you care about performance, enable it.
#maildir_copy_with_hardlinks = no
##
## mbox-specific settings
##
# Which locking methods to use for locking mbox. There are four available:
# dotlock: Create <mailbox>.lock file. This is the oldest and most NFS-safe
# solution. If you want to use /var/mail/ like directory, the
users
# will need write access to that directory.
# fcntl : Use this if possible. Works with NFS too if lockd is used.
# flock : May not exist in all systems. Doesn't work with NFS.
# lockf : May not exist in all systems. Doesn't work with NFS.
#
# You can use multiple locking methods; if you do the order they're declared
# in is important to avoid deadlocks if other MTAs/MUAs are using multiple #
locking methods as well. Some operating systems don't allow using some of #
them simultaneously.
#mbox_read_locks = fcntl
#mbox_write_locks = fcntl
# Maximum time in seconds to wait for lock (all of them) before aborting.
#mbox_lock_timeout = 300
# If dotlock exists but the mailbox isn't modified in any way, override the
# lock file after this many seconds.
#mbox_dotlock_change_timeout = 120
# When mbox changes unexpectedly we have to fully read it to find out what #
changed. If the mbox is large this can take a long time. Since the change #
is usually just a newly appended mail, it'd be faster to simply read the #
new mails. If this setting is enabled, Dovecot does this but still safely #
fallbacks to re-reading the whole mbox file whenever something in mbox isn't
# how it's expected to be. The only real downside to this setting is that if
# some other MUA changes message flags, Dovecot doesn't notice it
immediately.
# Note that a full sync is done with SELECT, EXAMINE, EXPUNGE and CHECK #
commands.
#mbox_dirty_syncs = yes
# Like mbox_dirty_syncs, but don't do full syncs even with SELECT, EXAMINE,
# EXPUNGE or CHECK commands. If this is set, mbox_dirty_syncs is ignored.
#mbox_very_dirty_syncs = no
# Delay writing mbox headers until doing a full write sync (EXPUNGE and
CHECK # commands and when closing the mailbox). This is especially useful
for POP3 # where clients often delete all mails. The downside is that our
changes # aren't immediately visible to other MUAs.
#mbox_lazy_writes = yes
# If mbox size is smaller than this (in kilobytes), don't write index files.
# If an index file already exists it's still read, just not updated.
#mbox_min_index_size = 0
##
## dbox-specific settings
##
# Maximum dbox file size in kilobytes until it's rotated.
#dbox_rotate_size = 2048
# Minimum dbox file size in kilobytes before it's rotated # (overrides
dbox_rotate_days) #dbox_rotate_min_size = 16
# Maximum dbox file age in days until it's rotated. Day always begins from #
midnight, so 1 = today, 2 = yesterday, etc. 0 = check disabled.
#dbox_rotate_days = 0
##
## IMAP specific settings
##
protocol imap {
# Login executable location.
#login_executable = /usr/libexec/dovecot/imap-login
# IMAP executable location. Changing this allows you to execute other
# binaries before the imap process is executed.
#
# This would write rawlogs into ~/dovecot.rawlog/ directory:
# mail_executable = /usr/libexec/dovecot/rawlog
/usr/libexec/dovecot/imap
#
# This would attach gdb into the imap process and write backtraces into
# /tmp/gdbhelper.* files:
# mail_executable = /usr/libexec/dovecot/gdbhelper
/usr/libexec/dovecot/imap
#
#mail_executable = /usr/libexec/dovecot/imap
# Maximum IMAP command line length in bytes. Some clients generate very
long
# command lines with huge mailboxes, so you may need to raise this if you
get
# "Too long argument" or "IMAP command line too large" errors often.
#imap_max_line_length = 65536
# Support for dynamically loadable plugins. mail_plugins is a space
separated
# list of plugins to load.
#mail_plugins =
#mail_plugin_dir = /usr/lib/dovecot/imap
# Send IMAP capabilities in greeting message. This makes it unnecessary
for
# clients to request it with CAPABILITY command, so it saves one
round-trip.
# Many clients however don't understand it and ask the CAPABILITY anyway.
#login_greeting_capability = no
# Workarounds for various client bugs:
# delay-newmail:
# Send EXISTS/RECENT new mail notifications only when replying to NOOP
# and CHECK commands. Some clients ignore them otherwise, for example
# OSX Mail. Outlook Express breaks more badly though, without this it
# may show user "Message no longer in server" errors. Note that OE6
still
# breaks even with this workaround if synchronization is set to
# "Headers Only".
# outlook-idle:
# Outlook and Outlook Express never abort IDLE command, so if no mail
# arrives in half a hour, Dovecot closes the connection. This is still
# fine, except Outlook doesn't connect back so you don't see if new
mail
# arrives.
# netscape-eoh:
# Netscape 4.x breaks if message headers don't end with the empty "end
of
# headers" line. Normally all messages have this, but setting this
# workaround makes sure that Netscape never breaks by adding the line
if
# it doesn't exist. This is done only for FETCH BODY[HEADER.FIELDS..]
# commands. Note that RFC says this shouldn't be done.
# tb-extra-mailbox-sep:
# With mbox storage a mailbox can contain either mails or
submailboxes,
# but not both. Thunderbird separates these two by forcing server to
# accept '/' suffix in mailbox names in subscriptions list.
# The list is space-separated.
imap_client_workarounds = outlook-idle delay-newmail }
##
## POP3 specific settings
##
protocol pop3 {
# Login executable location.
#login_executable = /usr/libexec/dovecot/pop3-login
# POP3 executable location
#mail_executable = /usr/libexec/dovecot/pop3
# Don't try to set mails non-recent or seen with POP3 sessions. This is
# mostly intended to reduce disk I/O. With maildir it doesn't move files
# from new/ to cur/, with mbox it doesn't write Status-header.
#pop3_no_flag_updates = no
# Support LAST command which exists in old POP3 specs, but has been
removed
# from new ones. Some clients still wish to use this though. Enabling this
# makes RSET command clear all \Seen flags from messages.
#pop3_enable_last = no
# If mail has X-UIDL header, use it as the mail's UIDL.
#pop3_reuse_xuidl = no
# Keep the mailbox locked for the entire POP3 session.
#pop3_lock_session = no
# POP3 UIDL format to use. You can use following variables:
#
# %v - Mailbox UIDVALIDITY
# %u - Mail UID
# %m - MD5 sum of the mailbox headers in hex (mbox only)
# %f - filename (maildir only)
#
# If you want UIDL compatibility with other POP3 servers, use:
# UW's ipop3d : %08Xv%08Xu
# Courier version 0 : %f
# Courier version 1 : %u
# Courier version 2 : %v-%u
# Cyrus (<= 2.1.3) : %u
# Cyrus (>= 2.1.4) : %v.%u
# Older Dovecots : %v.%u
# tpop3d : %Mf
#
# Note that Outlook 2003 seems to have problems with %v.%u format which
was
# Dovecot's default, so if you're building a new server it would be a good
# idea to change this. %08Xu%08Xv should be pretty fail-safe.
#
# NOTE: Nowadays this is required to be set explicitly, since the old
# default was bad but it couldn't be changed without breaking existing
# installations. %08Xu%08Xv will be the new default, so use it for new
# installations.
#
#pop3_uidl_format = %08Xu%08Xv
# POP3 logout format string:
# %t - number of TOP commands
# %p - number of bytes sent to client as a result of TOP command
# %r - number of RETR commands
# %b - number of bytes sent to client as a result of RETR command
# %d - number of deleted messages
# %m - number of messages (before deletion)
# %s - mailbox size in bytes (before deletion)
#pop3_logout_format = top=%t/%p, retr=%r/%b, del=%d/%m, size=%s
# Support for dynamically loadable plugins. mail_plugins is a space
separated
# list of plugins to load.
#mail_plugins =
#mail_plugin_dir = /usr/lib/dovecot/pop3
# Workarounds for various client bugs:
# outlook-no-nuls:
# Outlook and Outlook Express hang if mails contain NUL characters.
# This setting replaces them with 0x80 character.
# oe-ns-eoh:
# Outlook Express and Netscape Mail breaks if end of headers-line is
# missing. This option simply sends it if it's missing.
# The list is space-separated.
#pop3_client_workarounds =
}
##
## LDA specific settings
##
protocol lda {
# Address to use when sending rejection mails.
postmaster_address = postmaster at example.com
# Hostname to use in various parts of sent mails, eg. in Message-Id.
# Default is the system's real hostname.
#hostname =
# Support for dynamically loadable plugins. mail_plugins is a space
separated
# list of plugins to load.
#mail_plugins =
#mail_plugin_dir = /usr/lib/dovecot/lda
# Binary to use for sending mails.
#sendmail_path = /usr/lib/sendmail
# UNIX socket path to master authentication server to find users.
#auth_socket_path = /var/run/dovecot/auth-master }
##
## Authentication processes
##
# Executable location
#auth_executable = /usr/libexec/dovecot/dovecot-auth
# Set max. process size in megabytes.
#auth_process_size = 256
# Authentication cache size in kilobytes. 0 means it's disabled.
# Note that bsdauth, PAM and vpopmail require cache_key to be set for
caching # to be used. Also note that currently auth cache doesn't work very
well if # you're using multiple passdbs with same usernames in them.
#auth_cache_size = 0
# Time to live in seconds for cached data. After this many seconds the
cached # record is no longer used, *except* if the main database lookup
returns # internal failure.
#auth_cache_ttl = 3600
# Space separated list of realms for SASL authentication mechanisms that
need # them. You can leave it empty if you don't want to support multiple
realms.
# Many clients simply use the first one listed here, so keep the default
realm # first.
#auth_realms =
# Default realm/domain to use if none was specified. This is used for both #
SASL realms and appending @domain to username in plaintext logins.
#auth_default_realm =
# List of allowed characters in username. If the user-given username
contains # a character not listed in here, the login automatically fails.
This is just # an extra check to make sure user can't exploit any potential
quote escaping # vulnerabilities with SQL/LDAP databases. If you want to
allow all characters, # set this value to empty.
#auth_username_chars =
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@
# Username character translations before it's looked up from databases. The
# value contains series of from -> to characters. For example "#@/@" means #
that '#' and '/' characters are translated to '@'.
#auth_username_translation =
# Username formatting before it's looked up from databases. You can use #
the standard variables here, eg. %Lu would lowercase the username, %n would
# drop away the domain if it was given, or "%n-AT-%d" would change the '@'
into # "-AT-". This translation is done after auth_username_translation
changes.
#auth_username_format =
# If you want to allow master users to log in by specifying the master #
username within the normal username string (ie. not using SASL mechanism's #
support for it), you can specify the separator character here. The format #
is then <username><separator><master username>. UW-IMAP uses "*" as the #
separator, so that could be a good choice.
#auth_master_user_separator =
# Username to use for users logging in with ANONYMOUS SASL mechanism
#auth_anonymous_username = anonymous
# More verbose logging. Useful for figuring out why authentication isn't #
working.
#auth_verbose = no
# Even more verbose logging for debugging purposes. Shows for example SQL #
queries.
#auth_debug = no
# In case of password mismatches, log the passwords and used scheme so the #
problem can be debugged. Requires auth_debug=yes to be set.
#auth_debug_passwords = no
# Maximum number of dovecot-auth worker processes. They're used to execute #
blocking passdb and userdb queries (eg. MySQL and PAM). They're #
automatically created and destroyed as needed.
#auth_worker_max_count = 30
# Kerberos keytab to use for the GSSAPI mechanism. Will use the system #
default (usually /etc/krb5.keytab) if not specified.
#auth_krb5_keytab =
auth default {
# Space separated list of wanted authentication mechanisms:
# plain login digest-md5 cram-md5 ntlm rpa apop anonymous gssapi
mechanisms = plain
#
# Password database is used to verify user's password (and nothing more).
# You can have multiple passdbs and userdbs. This is useful if you want to
# allow both system users (/etc/passwd) and virtual users to login without
# duplicating the system users into virtual database.
#
# http://wiki.dovecot.org/Authentication
#
# By adding master=yes setting inside a passdb you make the passdb a list
# of "master users", who can log in as anyone else. Unless you're using
PAM,
# you probably still want the destination user to be looked up from passdb
# that it really exists. This can be done by adding pass=yes setting to
the
# master passdb.
#
# http://wiki.dovecot.org/MasterPassword
# Users can be temporarily disabled by adding a passdb with deny=yes.
# If the user is found from that database, authentication will fail.
# The deny passdb should always be specified before others, so it gets
# checked first. Here's an example:
#passdb passwd-file {
# File contains a list of usernames, one per line
#args = /etc/dovecot.deny
#deny = yes
#}
# PAM authentication. Preferred nowadays by most systems.
# Note that PAM can only be used to verify if user's password is correct,
# so it can't be used as userdb. If you don't want to use a separate user
# database (passwd usually), you can use static userdb.
# REMEMBER: You'll need /etc/pam.d/dovecot file created for PAM
# authentication to actually work.
passdb pam {
# [session=yes] [setcred=yes] [cache_key=<key>] [<service name>]
#
# session=yes makes Dovecot open and immediately close PAM session. Some
# PAM plugins need this to work, such as pam_mkhomedir.
#
# setcred=yes makes Dovecot establish PAM credentials if some PAM
plugins
# need that. They aren't ever deleted though, so this isn't enabled by
# default.
#
# cache_key can be used to enable authentication caching for PAM
# (auth_cache_size also needs to be set). It isn't enabled by default
# because PAM modules can do all kinds of checks besides checking
password,
# such as checking IP address. Dovecot can't know about these checks
# without some help. cache_key is simply a list of variables (see
# doc/variables.txt) which must match for the cached data to be used.
# Here are some examples:
# %u - Username must match. Probably sufficient for most uses.
# %u%r - Username and remote IP address must match.
# %u%s - Username and service (ie. IMAP, POP3) must match.
#
# If service name is "*", it means the authenticating service name
# is used, eg. pop3 or imap (/etc/pam.d/pop3, /etc/pam.d/imap).
#
# Some examples:
# args = session=yes *
# args = cache_key=%u dovecot
#args = dovecot
}
# /etc/passwd or similar, using getpwnam()
# In many systems nowadays this uses Name Service Switch, which is
# configured in /etc/nsswitch.conf.
#passdb passwd {
#}
# /etc/shadow or similiar, using getspnam(). Deprecated by PAM nowadays.
#passdb shadow {
#}
# BSD authentication. Used by at least OpenBSD.
#passdb bsdauth {
# [cache_key=<key>] - See cache_key in PAM for explanation.
#args =
#}
# passwd-like file with specified location
#passdb passwd-file {
# Path for passwd-file
#args =
#}
# checkpassword executable authentication
# NOTE: You will probably want to use "userdb prefetch" with this.
#passdb checkpassword {
# Path for checkpassword binary
#args =
#}
# SQL database
#passdb sql {
# Path for SQL configuration file, see doc/dovecot-sql.conf for example
#args =
#}
# LDAP database
#passdb ldap {
# Path for LDAP configuration file, see doc/dovecot-ldap.conf for
example
#args =
#}
# vpopmail authentication
#passdb vpopmail {
# [cache_key=<key>] - See cache_key in PAM for explanation.
#args =
#}
#
# User database specifies where mails are located and what user/group IDs
# own them. For single-UID configuration use "static".
#
# http://wiki.dovecot.org/Authentication
# http://wiki.dovecot.org/VirtualUsers
#
# /etc/passwd or similar, using getpwnam()
# In many systems nowadays this uses Name Service Switch, which is
# configured in /etc/nsswitch.conf.
userdb passwd {
}
# passwd-like file with specified location
#userdb passwd-file {
# Path for passwd-file
#args =
#}
# static settings generated from template
#userdb static {
# Template for settings. Can return anything a userdb could normally
# return, eg.: uid, gid, home, mail, nice
#
# A few examples:
#
# args = uid=500 gid=500 home=/var/mail/%u
# args = uid=500 gid=500 home=/home/%u mail=mbox:/home/%u/mail nice=10
#
#args =
#}
# SQL database
#userdb sql {
# Path for SQL configuration file, see doc/dovecot-sql.conf for example
#args =
#}
# LDAP database
#userdb ldap {
# Path for LDAP configuration file, see doc/dovecot-ldap.conf for
example
#args =
#}
# vpopmail
#userdb vpopmail {
#}
# "prefetch" user database means that the passdb already provided the
# needed information and there's no need to do a separate userdb lookup.
# This can be made to work with SQL and LDAP databases, see their example
# configuration files for more information how to do it.
# http://wiki.dovecot.org/AuthSpecials
#userdb prefetch {
#}
# User to use for the process. This user needs access to only user and
# password databases, nothing else. Only shadow and pam authentication
# requires roots, so use something else if possible. Note that passwd
# authentication with BSDs internally accesses shadow files, which also
# requires roots. Note that this user is NOT used to access mails.
# That user is specified by userdb above.
user = root
# Directory where to chroot the process. Most authentication backends
don't
# work if this is set, and there's no point chrooting if auth_user is
root.
# Note that valid_chroot_dirs isn't needed to use this setting.
#chroot =
# Number of authentication processes to create
#count = 1
# Require a valid SSL client certificate or the authentication fails.
#ssl_require_client_cert = no
# Take the username from client's SSL certificate, using
X509_NAME_oneline()
# which typically uses subject's Distinguished Name.
#ssl_username_from_cert = no
# It's possible to export the authentication interface to other programs:
#socket listen {
#master {
# Master socket is typically used to give Dovecot's local delivery
# agent access to userdb so it can find mailbox locations. It can
# however also be used to disturb regular user authentications.
# WARNING: Giving untrusted users access to master socket may be a
# security risk, don't give too wide permissions to it!
#path = /var/run/dovecot/auth-master
#mode = 0600
# Default user/group is the one who started dovecot-auth (root)
#user =
#group =
#}
#client {
# The client socket is generally safe to export to everyone. Typical
use
# is to export it to your SMTP server so it can do SMTP AUTH lookups
# using it.
#path = /var/run/dovecot/auth-client
#mode = 0660
#}
#}
}
# If you wish to use another authentication server than dovecot-auth, you
can # use connect sockets. They assumed to be already running, Dovecot's
master # process only tries to connect to them. They don't need any other
settings # than the path for the master socket, as the configuration is done
elsewhere.
# Note that the client sockets must exist in the login_dir.
#auth external {
# socket connect {
# master {
# path = /var/run/dovecot/auth-master
# }
# }
#}
##
## Dictionary server settings
##
# Dictionary can be used by some plugins to store key=value lists.
# Currently this is only used by dict quota backend. The dictionary can be #
used either directly or though a dictionary server. The following dict block
# maps dictionary names to URIs when the server is used. These can then be #
referenced using URIs in format "proxy:<name>".
dict {
#quota = mysql:/etc/dovecot-dict-quota.conf
}
##
## Plugin settings
##
plugin {
# Here you can give some extra environment variables to mail processes.
# This is mostly meant for passing parameters to plugins. %variable
# expansion is done for all values.
# Quota plugin. Multiple backends are supported:
# dirsize: Find and sum all the files found from mail directory
# dict: Keep quota stored in dictionary (eg. SQL)
# maildir: Maildir++ quota
# fs: Read-only support for filesystem quota
#quota = maildir
# ACL plugin. vfile backend reads ACLs from "dovecot-acl" file from
maildir
# directory. You can also optionally give a global ACL directory path
where
# ACLs are applied to all users' mailboxes. The global ACL directory
contains
# one file for each mailbox, eg. INBOX or sub.mailbox.
#acl = vfile:/etc/dovecot-acls
# Convert plugin. If set, specifies the source storage path which is
# converted to destination storage (default_mail_env).
#convert_mail = mbox:%h/mail
# Trash plugin. When saving a message would make user go over quota, this
# plugin automatically deletes the oldest mails from configured mailboxes
# until the message can be saved within quota limits. The configuration
file
# is a text file where each line is in format: <priority> <mailbox name>
# Mails are first deleted in lowest -> highest priority number order
#trash = /etc/dovecot-trash.conf
}
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