Dovecot not surviving OpenLDAP restart
Dag Nygren
dag at newtech.fi
Thu May 9 12:28:53 EEST 2019
Citerar "A. Schulze via dovecot" <dovecot at dovecot.org>:
> Am 08.05.19 um 15:32 schrieb Dag Nygren via dovecot:
>> Now since some update of dovecot it will not be able to authenticate
>> your logins after a restart of the LDAP service is restarted
>> without a reboot of the dovecot server.
>
> Hello,
>
> This sounds more like a configuration glitch.
> Could you show the ldap related dovecot configuration?
>
> Logs with failure message will also be helpful.
>
> Andreas
Not much in the logs, just:
............... imap-login: Disconnected (auth failed, 2 attempts in 8
secs): ....................
Here the very basic config:
==================================================
# This file is opened as root, so it should be owned by root and mode 0600.
#
# http://wiki2.dovecot.org/AuthDatabase/LDAP
#
# NOTE: If you're not using authentication binds, you'll need to give
# dovecot-auth read access to userPassword field in the LDAP server.
# With OpenLDAP this is done by modifying /etc/ldap/slapd.conf. There should
# already be something like this:
# access to attribute=userPassword
# by dn="<dovecot's dn>" read # add this
# by anonymous auth
# by self write
# by * none
# Space separated list of LDAP hosts to use. host:port is allowed too.
hosts = ns.newtech.fi ns2.newtech.fi
# LDAP URIs to use. You can use this instead of hosts list. Note that this
# setting isn't supported by all LDAP libraries.
#uris =
# Distinguished Name - the username used to login to the LDAP server.
# Leave it commented out to bind anonymously (useful with auth_bind=yes).
#dn =
# Password for LDAP server, if dn is specified.
#dnpass =
# Use SASL binding instead of the simple binding. Note that this changes
# ldap_version automatically to be 3 if it's lower. Also note that SASL binds
# and auth_bind=yes don't work together.
#sasl_bind = no
# SASL mechanism name to use.
#sasl_mech =
# SASL realm to use.
#sasl_realm =
# SASL authorization ID, ie. the dnpass is for this "master user", but the
# dn is still the logged in user. Normally you want to keep this empty.
#sasl_authz_id =
# Use TLS to connect to the LDAP server.
#tls = no
# TLS options, currently supported only with OpenLDAP:
#tls_ca_cert_file =
#tls_ca_cert_dir =
#tls_cipher_suite =
# TLS cert/key is used only if LDAP server requires a client certificate.
#tls_cert_file =
#tls_key_file =
# Valid values: never, hard, demand, allow, try
#tls_require_cert =
# Use the given ldaprc path.
#ldaprc_path =
# LDAP library debug level as specified by LDAP_DEBUG_* in ldap_log.h.
# -1 = everything. You may need to recompile OpenLDAP with debugging enabled
# to get enough output.
#debug_level = 0
# Use authentication binding for verifying password's validity. This works by
# logging into LDAP server using the username and password given by client.
# The pass_filter is used to find the DN for the user. Note that the
pass_attrs
# is still used, only the password field is ignored in it. Before doing any
# search, the binding is switched back to the default DN.
#auth_bind = no
# If authentication binding is used, you can save one LDAP request per login
# if users' DN can be specified with a common template. The template can use
# the standard %variables (see user_filter). Note that you can't
# use any pass_attrs if you use this setting.
#
# If you use this setting, it's a good idea to use a different
# dovecot-ldap.conf.ext for userdb (it can even be a symlink, just as long as
# the filename is different in userdb's args). That way one connection is used
# only for LDAP binds and another connection is used for user lookups.
# Otherwise the binding is changed to the default DN before each user lookup.
#
# For example:
# auth_bind_userdn = cn=%u,ou=people,o=org
#
#auth_bind_userdn =
# LDAP protocol version to use. Likely 2 or 3.
#ldap_version = 3
# LDAP base. %variables can be used here.
# For example: dc=mail, dc=example, dc=org
base = dc=newtech,dc=fi
# Dereference: never, searching, finding, always
#deref = never
# Search scope: base, onelevel, subtree
#scope = subtree
# User attributes are given in LDAP-name=dovecot-internal-name list. The
# internal names are:
# uid - System UID
# gid - System GID
# home - Home directory
# mail - Mail location
#
# There are also other special fields which can be returned, see
# http://wiki2.dovecot.org/UserDatabase/ExtraFields
#user_attrs = homeDirectory=home,uidNumber=uid,gidNumber=gid
user_attrs = homeDirectory=home,uidNumber=uid,gidNumber=gid
# Filter for user lookup. Some variables can be used (see
# http://wiki2.dovecot.org/Variables for full list):
# %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 user there's no domain
user_filter = (&(objectClass=posixAccount)(uid=%u))
# Password checking attributes:
# user: Virtual user name (user at domain), if you wish to change the
# user-given username to something else
# password: Password, may optionally start with {type}, eg. {crypt}
# There are also other special fields which can be returned, see
# http://wiki2.dovecot.org/PasswordDatabase/ExtraFields
pass_attrs = uid=user,userPassword=password
pass_filter = (&(objectClass=posixAccount)(uid=%u))
# Attributes and filter to get a list of all users
iterate_attrs = uid=user
iterate_filter = (objectClass=posixAccount)
# Default password scheme. "{scheme}" before password overrides this.
# List of supported schemes is in: http://wiki2.dovecot.org/Authentication
#default_pass_scheme = SHA
# If you wish to avoid two LDAP lookups (passdb + userdb), you can use
# userdb prefetch instead of userdb ldap in dovecot.conf. In that case you'll
# also have to include user_attrs in pass_attrs field prefixed with "userdb_"
# string. For example:
#pass_attrs = uid=user,userPassword=password,\
# homeDirectory=userdb_home,uidNumber=userdb_uid,gidNumber=userdb_gid
# Filter for password lookups
# This file is opened as root, so it should be owned by root and mode 0600.
#
# http://wiki2.dovecot.org/AuthDatabase/LDAP
#
# NOTE: If you're not using authentication binds, you'll need to give
# dovecot-auth read access to userPassword field in the LDAP server.
# With OpenLDAP this is done by modifying /etc/ldap/slapd.conf. There should
# already be something like this:
# access to attribute=userPassword
# by dn="<dovecot's dn>" read # add this
# by anonymous auth
# by self write
# by * none
# Space separated list of LDAP hosts to use. host:port is allowed too.
hosts = ns.newtech.fi ns2.newtech.fi
# LDAP URIs to use. You can use this instead of hosts list. Note that this
# setting isn't supported by all LDAP libraries.
#uris =
# Distinguished Name - the username used to login to the LDAP server.
# Leave it commented out to bind anonymously (useful with auth_bind=yes).
#dn =
# Password for LDAP server, if dn is specified.
#dnpass =
# Use SASL binding instead of the simple binding. Note that this changes
# ldap_version automatically to be 3 if it's lower. Also note that SASL binds
# and auth_bind=yes don't work together.
#sasl_bind = no
# SASL mechanism name to use.
#sasl_mech =
# SASL realm to use.
#sasl_realm =
# SASL authorization ID, ie. the dnpass is for this "master user", but the
# dn is still the logged in user. Normally you want to keep this empty.
#sasl_authz_id =
# Use TLS to connect to the LDAP server.
#tls = no
# TLS options, currently supported only with OpenLDAP:
#tls_ca_cert_file =
#tls_ca_cert_dir =
#tls_cipher_suite =
# TLS cert/key is used only if LDAP server requires a client certificate.
#tls_cert_file =
#tls_key_file =
# Valid values: never, hard, demand, allow, try
#tls_require_cert =
# Use the given ldaprc path.
#ldaprc_path =
# LDAP library debug level as specified by LDAP_DEBUG_* in ldap_log.h.
# -1 = everything. You may need to recompile OpenLDAP with debugging enabled
# to get enough output.
#debug_level = 0
# Use authentication binding for verifying password's validity. This works by
# logging into LDAP server using the username and password given by client.
# The pass_filter is used to find the DN for the user. Note that the
pass_attrs
# is still used, only the password field is ignored in it. Before doing any
# search, the binding is switched back to the default DN.
#auth_bind = no
# If authentication binding is used, you can save one LDAP request per login
# if users' DN can be specified with a common template. The template can use
# the standard %variables (see user_filter). Note that you can't
# use any pass_attrs if you use this setting.
#
# If you use this setting, it's a good idea to use a different
# dovecot-ldap.conf.ext for userdb (it can even be a symlink, just as long as
# the filename is different in userdb's args). That way one connection is used
# only for LDAP binds and another connection is used for user lookups.
# Otherwise the binding is changed to the default DN before each user lookup.
#
# For example:
# auth_bind_userdn = cn=%u,ou=people,o=org
#
#auth_bind_userdn =
# LDAP protocol version to use. Likely 2 or 3.
#ldap_version = 3
# LDAP base. %variables can be used here.
# For example: dc=mail, dc=example, dc=org
base = dc=newtech,dc=fi
# Dereference: never, searching, finding, always
#deref = never
# Search scope: base, onelevel, subtree
#scope = subtree
# User attributes are given in LDAP-name=dovecot-internal-name list. The
# internal names are:
# uid - System UID
# gid - System GID
# home - Home directory
# mail - Mail location
#
# There are also other special fields which can be returned, see
# http://wiki2.dovecot.org/UserDatabase/ExtraFields
#user_attrs = homeDirectory=home,uidNumber=uid,gidNumber=gid
user_attrs = homeDirectory=home,uidNumber=uid,gidNumber=gid
# Filter for user lookup. Some variables can be used (see
# http://wiki2.dovecot.org/Variables for full list):
# %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 user there's no domain
user_filter = (&(objectClass=posixAccount)(uid=%u))
# Password checking attributes:
# user: Virtual user name (user at domain), if you wish to change the
# user-given username to something else
# password: Password, may optionally start with {type}, eg. {crypt}
# There are also other special fields which can be returned, see
# http://wiki2.dovecot.org/PasswordDatabase/ExtraFields
pass_attrs = uid=user,userPassword=password
pass_filter = (&(objectClass=posixAccount)(uid=%u))
# Attributes and filter to get a list of all users
iterate_attrs = uid=user
iterate_filter = (objectClass=posixAccount)
# Default password scheme. "{scheme}" before password overrides this.
# List of supported schemes is in: http://wiki2.dovecot.org/Authentication
#default_pass_scheme = SHA
# If you wish to avoid two LDAP lookups (passdb + userdb), you can use
# userdb prefetch instead of userdb ldap in dovecot.conf. In that case you'll
# also have to include user_attrs in pass_attrs field prefixed with "userdb_"
# string. For example:
#pass_attrs = uid=user,userPassword=password,\
# homeDirectory=userdb_home,uidNumber=userdb_uid,gidNumber=userdb_gid
# Filter for password lookups
# This file is opened as root, so it should be owned by root and mode 0600.
#
# http://wiki2.dovecot.org/AuthDatabase/LDAP
#
# NOTE: If you're not using authentication binds, you'll need to give
# dovecot-auth read access to userPassword field in the LDAP server.
# With OpenLDAP this is done by modifying /etc/ldap/slapd.conf. There should
# already be something like this:
# access to attribute=userPassword
# by dn="<dovecot's dn>" read # add this
# by anonymous auth
# by self write
# by * none
# Space separated list of LDAP hosts to use. host:port is allowed too.
hosts = ns.newtech.fi ns2.newtech.fi
# LDAP URIs to use. You can use this instead of hosts list. Note that this
# setting isn't supported by all LDAP libraries.
#uris =
# Distinguished Name - the username used to login to the LDAP server.
# Leave it commented out to bind anonymously (useful with auth_bind=yes).
#dn =
# Password for LDAP server, if dn is specified.
#dnpass =
# Use SASL binding instead of the simple binding. Note that this changes
# ldap_version automatically to be 3 if it's lower. Also note that SASL binds
# and auth_bind=yes don't work together.
#sasl_bind = no
# SASL mechanism name to use.
#sasl_mech =
# SASL realm to use.
#sasl_realm =
# SASL authorization ID, ie. the dnpass is for this "master user", but the
# dn is still the logged in user. Normally you want to keep this empty.
#sasl_authz_id =
# Use TLS to connect to the LDAP server.
#tls = no
# TLS options, currently supported only with OpenLDAP:
#tls_ca_cert_file =
#tls_ca_cert_dir =
#tls_cipher_suite =
# TLS cert/key is used only if LDAP server requires a client certificate.
#tls_cert_file =
#tls_key_file =
# Valid values: never, hard, demand, allow, try
#tls_require_cert =
# Use the given ldaprc path.
#ldaprc_path =
# LDAP library debug level as specified by LDAP_DEBUG_* in ldap_log.h.
# -1 = everything. You may need to recompile OpenLDAP with debugging enabled
# to get enough output.
#debug_level = 0
# Use authentication binding for verifying password's validity. This works by
# logging into LDAP server using the username and password given by client.
# The pass_filter is used to find the DN for the user. Note that the
pass_attrs
# is still used, only the password field is ignored in it. Before doing any
# search, the binding is switched back to the default DN.
#auth_bind = no
# If authentication binding is used, you can save one LDAP request per login
# if users' DN can be specified with a common template. The template can use
# the standard %variables (see user_filter). Note that you can't
# use any pass_attrs if you use this setting.
#
# If you use this setting, it's a good idea to use a different
# dovecot-ldap.conf.ext for userdb (it can even be a symlink, just as long as
# the filename is different in userdb's args). That way one connection is used
# only for LDAP binds and another connection is used for user lookups.
# Otherwise the binding is changed to the default DN before each user lookup.
#
# For example:
# auth_bind_userdn = cn=%u,ou=people,o=org
#
#auth_bind_userdn =
# LDAP protocol version to use. Likely 2 or 3.
#ldap_version = 3
# LDAP base. %variables can be used here.
# For example: dc=mail, dc=example, dc=org
base = dc=newtech,dc=fi
# Dereference: never, searching, finding, always
#deref = never
# Search scope: base, onelevel, subtree
#scope = subtree
# User attributes are given in LDAP-name=dovecot-internal-name list. The
# internal names are:
# uid - System UID
# gid - System GID
# home - Home directory
# mail - Mail location
#
# There are also other special fields which can be returned, see
# http://wiki2.dovecot.org/UserDatabase/ExtraFields
#user_attrs = homeDirectory=home,uidNumber=uid,gidNumber=gid
user_attrs = homeDirectory=home,uidNumber=uid,gidNumber=gid
# Filter for user lookup. Some variables can be used (see
# http://wiki2.dovecot.org/Variables for full list):
# %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 user there's no domain
user_filter = (&(objectClass=posixAccount)(uid=%u))
# Password checking attributes:
# user: Virtual user name (user at domain), if you wish to change the
# user-given username to something else
# password: Password, may optionally start with {type}, eg. {crypt}
# There are also other special fields which can be returned, see
# http://wiki2.dovecot.org/PasswordDatabase/ExtraFields
pass_attrs = uid=user,userPassword=password
pass_filter = (&(objectClass=posixAccount)(uid=%u))
# Attributes and filter to get a list of all users
iterate_attrs = uid=user
iterate_filter = (objectClass=posixAccount)
# Default password scheme. "{scheme}" before password overrides this.
# List of supported schemes is in: http://wiki2.dovecot.org/Authentication
#default_pass_scheme = SHA
# If you wish to avoid two LDAP lookups (passdb + userdb), you can use
# userdb prefetch instead of userdb ldap in dovecot.conf. In that case you'll
# also have to include user_attrs in pass_attrs field prefixed with "userdb_"
# string. For example:
#pass_attrs = uid=user,userPassword=password,\
# homeDirectory=userdb_home,uidNumber=userdb_uid,gidNumber=userdb_gid
# Filter for password lookups
==================================================
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