Citerar "A. Schulze via dovecot" <dovecot@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@domain, same as %u if there's no domain # %d - domain part in user@domain, empty if user there's no domain user_filter = (&(objectClass=posixAccount)(uid=%u))

# Password checking attributes: # user: Virtual user name (user@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@domain, same as %u if there's no domain # %d - domain part in user@domain, empty if user there's no domain user_filter = (&(objectClass=posixAccount)(uid=%u))

# Password checking attributes: # user: Virtual user name (user@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@domain, same as %u if there's no domain # %d - domain part in user@domain, empty if user there's no domain user_filter = (&(objectClass=posixAccount)(uid=%u))

# Password checking attributes: # user: Virtual user name (user@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

==================================================