I have the following Problem and googled for weeks now. Because I´ve really no clue where the problem is I´m asking my question here with the hope to find some ldap or ssl genius 🙂
I have a working openLdap Server with a stand alone client maschine (both running Linux Ubuntu 16.04.5).
The connection works fine. Now I´d like to secure the conection using ldaps.
First I´ve changed the SLAPD_SERVICES in
/etc/default/slapd
from ldap:/// ldapi:/// to ldap:/// ldaps:/// ldapi:///
Then I´ve created an own CA with a self signed Certificate and an ldap-server key, csr and crt (signed by the CA I´ve built).
I´ve added my own ca.crt to the trusted certs by copying it to
/usr/local/share/ca-certificates/
and executing this command:
sudo update-ca-certificates
I´ve copied the ca.crt, the ldap.key and the ldap.crt to /etc/ldap/ssl/files and make them owned by openldap
(chown & chgrp)
after I´ve done this I followed the tutorial (https://www.server-world.info/en/note?os=Debian_9&p=openldap&f=4) to create an mod_ssl.ldif
#
mod_ssl.ldif
dn: cn=config
changetype: modify
add: olcTLSCACertificateFile
olcTLSCACertificateFile: /etc/ldap/ssl/files/ca.crt
-
replace: olcTLSCertificateFile
olcTLSCertificateFile: /etc/ldap/ssl/files/ldap.crt
-
replace: olcTLSCertificateKeyFile
olcTLSCertificateKeyFile: /etc/ldap/ssl/files/ldap.key
#
After creating the ldif I´d wanted to add it to my config using this command
ldapmodify -Y EXTERNAL -H ldapi:/// -f mod_ssl.ldif
The output of this command is:
root@ldap-server:/etc/ldap/schema# ldapmodify -Y EXTERNAL -H ldapi:///
-f mod_ssl.ldif SASL/EXTERNAL authentication started SASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth SASL SSF: 0
modifying entry "cn=config" ldap_result: Can't contact LDAP server
(-1)
#
After this command my slapd was dead.
(–> Checked open ports bevore executing this command with netstat -tulpan and after executing.)
Restarted slapd with /etc/init.d/slapd restart
I enabled logging of slapd with loglevel -1
For my understanding the logs are totally clean and showing no Issues.
tail -f /var/log/syslog
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: activity on 1 descriptor
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: activity on:
Oct 19 08:59:17 ldap-server slapd[1464]:
Oct 19 08:59:17 ldap-server slapd[1464]: slap_listener_activate(11):
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: epoll: listen=9 active_threads=0 tvp=zero
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: epoll: listen=10 active_threads=0 tvp=zero
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: epoll: listen=11 busy
Oct 19 08:59:17 ldap-server slapd[1464]: >>> slap_listener(ldapi:///)
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: listen=11, new connection on 16
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: activity on 1 descriptor
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: activity on:
Oct 19 08:59:17 ldap-server slapd[1464]:
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: added 16r (active) listener=(nil)
Oct 19 08:59:17 ldap-server slapd[1464]: conn=1001 fd=16 ACCEPT from PATH=/var/run/slapd/ldapi (PATH=/var/run/slapd/ldapi)
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: epoll: listen=9 active_threads=0 tvp=zero
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: epoll: listen=10 active_threads=0 tvp=zero
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: epoll: listen=11 active_threads=0 tvp=zero
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: activity on 2 descriptors
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: activity on:
Oct 19 08:59:17 ldap-server slapd[1464]: 16r
Oct 19 08:59:17 ldap-server slapd[1464]:
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: read active on 16
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: epoll: listen=9 active_threads=0 tvp=zero
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: epoll: listen=10
active_threads=0 tvp=zero
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: epoll: listen=11 active_threads=0 tvp=zero
Oct 19 08:59:17 ldap-server slapd[1464]: connection_get(16)
Oct 19 08:59:17 ldap-server slapd[1464]: connection_get(16): got connid=1001
Oct 19 08:59:17 ldap-server slapd[1464]: connection_read(16): checking for input on id=1001
Oct 19 08:59:17 ldap-server slapd[1464]: op tag 0x60, time 1539932357
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: activity on 1 descriptor
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: activity on:
Oct 19 08:59:17 ldap-server slapd[1464]:
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: epoll: listen=9 active_threads=0 tvp=zero
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: epoll: listen=10 active_threads=0 tvp=zero
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: epoll: listen=11 active_threads=0 tvp=zero
Oct 19 08:59:17 ldap-server slapd[1464]: conn=1001 op=0 do_bind
Oct 19 08:59:17 ldap-server slapd[1464]: >>> dnPrettyNormal: <>
Oct 19 08:59:17 ldap-server slapd[1464]: <<< dnPrettyNormal: <>, <>
Oct 19 08:59:17 ldap-server slapd[1464]: conn=1001 op=0 BIND dn="" method=163
Oct 19 08:59:17 ldap-server slapd[1464]: do_bind: dn () SASL mech EXTERNAL
Oct 19 08:59:17 ldap-server slapd[1464]: ==> sasl_bind: dn="" mech=EXTERNAL datalen=0
Oct 19 08:59:17 ldap-server slapd[1464]: SASL Canonicalize [conn=1001]: authcid="gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth"
Oct 19 08:59:17 ldap-server slapd[1464]: slap_sasl_getdn: conn 1001 id=gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth [len=55]
Oct 19 08:59:17 ldap-server slapd[1464]: ==>slap_sasl2dn: converting SASL name gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth to a DN
Oct 19 08:59:17 ldap-server slapd[1464]: <==slap_sasl2dn: Converted SASL name to <nothing>
Oct 19 08:59:17 ldap-server slapd[1464]: SASL Canonicalize [conn=1001]: slapAuthcDN="gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth"
Oct 19 08:59:17 ldap-server slapd[1464]: SASL proxy authorize [conn=1001]: authcid="gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth" authzid="gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth"
Oct 19 08:59:17 ldap-server slapd[1464]: conn=1001 op=0 BIND authcid="gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth" authzid="gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth"
Oct 19 08:59:17 ldap-server slapd[1464]: SASL Authorize [conn=1001]: proxy authorization allowed authzDN=""
Oct 19 08:59:17 ldap-server slapd[1464]: send_ldap_sasl: err=0 len=-1
Oct 19 08:59:17 ldap-server slapd[1464]: conn=1001 op=0 BIND dn="gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth" mech=EXTERNAL sasl_ssf=0 ssf=71
Oct 19 08:59:17 ldap-server slapd[1464]: do_bind: SASL/EXTERNAL bind: dn="gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth" sasl_ssf=0
Oct 19 08:59:17 ldap-server slapd[1464]: send_ldap_response: msgid=1 tag=97 err=0
Oct 19 08:59:17 ldap-server kernel: [ 1801.480222] slapd[1468]: segfault at 35 ip 00007f1093e55360 sp 00007f104bffc268 error 4 in libgmp.so.10.3.0[7f1093e41000+7f000]
Oct 19 08:59:17 ldap-server slapd[1464]: conn=1001 op=0 RESULT tag=97 err=0 text=
Oct 19 08:59:17 ldap-server slapd[1464]: <== slap_sasl_bind: rc=0
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: activity on 1 descriptor
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: activity on:
Oct 19 08:59:17 ldap-server slapd[1464]: 16r
Oct 19 08:59:17 ldap-server slapd[1464]:
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: read active on 16
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: epoll: listen=9 active_threads=0 tvp=zero
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: epoll: listen=10 active_threads=0 tvp=zero
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: epoll: listen=11 active_threads=0 tvp=zero
Oct 19 08:59:17 ldap-server slapd[1464]: connection_get(16)
Oct 19 08:59:17 ldap-server slapd[1464]: connection_get(16): got connid=1001
Oct 19 08:59:17 ldap-server slapd[1464]: connection_read(16): checking for input on id=1001
Oct 19 08:59:17 ldap-server slapd[1464]: op tag 0x66, time 1539932357
Oct 19 08:59:17 ldap-server slapd[1464]: conn=1001 op=1 do_modify
Oct 19 08:59:17 ldap-server slapd[1464]: conn=1001 op=1 do_modify: dn (cn=config)
Oct 19 08:59:17 ldap-server slapd[1464]: >>> dnPrettyNormal: <cn=config>
Oct 19 08:59:17 ldap-server slapd[1464]: <<< dnPrettyNormal: <cn=config>, <cn=config>
Oct 19 08:59:17 ldap-server slapd[1464]: conn=1001 op=1 modifications:
Oct 19 08:59:17 ldap-server slapd[1464]: #011add: olcTLSCACertificateFile
Oct 19 08:59:17 ldap-server slapd[1464]: #011#011one value, length 33
Oct 19 08:59:17 ldap-server slapd[1464]: #011replace: olcTLSCertificateFile
Oct 19 08:59:17 ldap-server slapd[1464]: #011#011one value, length 35
Oct 19 08:59:17 ldap-server slapd[1464]: #011replace: olcTLSCertificateKeyFile
Oct 19 08:59:17 ldap-server slapd[1464]: #011#011one value, length 35
Oct 19 08:59:17 ldap-server slapd[1464]: conn=1001 op=1 MOD dn="cn=config"
Oct 19 08:59:17 ldap-server slapd[1464]: conn=1001 op=1 MOD attr=olcTLSCACertificateFile olcTLSCertificateFile olcTLSCertificateKeyFile
Oct 19 08:59:17 ldap-server slapd[1464]: => access_allowed: result not in cache (olcTLSCACertificateFile)
Oct 19 08:59:17 ldap-server slapd[1464]: => access_allowed: add access to "cn=config" "olcTLSCACertificateFile" requested
Oct 19 08:59:17 ldap-server slapd[1464]: => acl_get: [1] attr olcTLSCACertificateFile
Oct 19 08:59:17 ldap-server slapd[1464]: => acl_mask: access to entry "cn=config", attr "olcTLSCACertificateFile" requested
Oct 19 08:59:17 ldap-server slapd[1464]: => acl_mask: to value by "gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth", (=0)
Oct 19 08:59:17 ldap-server slapd[1464]: <= check a_dn_pat: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
Oct 19 08:59:17 ldap-server slapd[1464]: <= acl_mask: [1] applying manage(=mwrscxd) (stop)
Oct 19 08:59:17 ldap-server slapd[1464]: <= acl_mask: [1] mask: manage(=mwrscxd)
Oct 19 08:59:17 ldap-server slapd[1464]: => slap_access_allowed: add access granted by manage(=mwrscxd)
Oct 19 08:59:17 ldap-server slapd[1464]: => access_allowed: add access granted by manage(=mwrscxd)
Oct 19 08:59:17 ldap-server slapd[1464]: => access_allowed: result not in
cache (olcTLSCertificateFile)
Oct 19 08:59:17 ldap-server slapd[1464]: => access_allowed: delete access to "cn=config" "olcTLSCertificateFile" requested
Oct 19 08:59:17 ldap-server slapd[1464]: => acl_get: [1] attr olcTLSCertificateFile
Oct 19 08:59:17 ldap-server slapd[1464]: => acl_mask: access to entry "cn=config", attr "olcTLSCertificateFile" requested
Oct 19 08:59:17 ldap-server slapd[1464]: => acl_mask: to all values by "gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth", (=0)
Oct 19 08:59:17 ldap-server slapd[1464]: <= check a_dn_pat: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
Oct 19 08:59:17 ldap-server slapd[1464]: <= acl_mask: [1] applying manage(=mwrscxd) (stop)
Oct 19 08:59:17 ldap-server slapd[1464]: <= acl_mask: [1] mask: manage(=mwrscxd)
Oct 19 08:59:17 ldap-server slapd[1464]: => slap_access_allowed: delete access granted by manage(=mwrscxd)
Oct 19 08:59:17 ldap-server slapd[1464]: => access_allowed: delete access granted by manage(=mwrscxd)
Oct 19 08:59:17 ldap-server slapd[1464]: => access_allowed: result not in cache (olcTLSCertificateFile)
Oct 19 08:59:17 ldap-server slapd[1464]: => access_allowed: add access to "cn=config" "olcTLSCertificateFile" requested
Oct 19 08:59:17 ldap-server slapd[1464]: => acl_get: [1] attr olcTLSCertificateFile
Oct 19 08:59:17 ldap-server slapd[1464]: => acl_mask: access to entry "cn=config", attr "olcTLSCertificateFile" requested
Oct 19 08:59:17 ldap-server slapd[1464]: => acl_mask: to value by "gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth", (=0)
Oct 19 08:59:17 ldap-server slapd[1464]: <= check a_dn_pat: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
Oct 19 08:59:17 ldap-server slapd[1464]: <= acl_mask: [1] applying manage(=mwrscxd) (stop)
Oct 19 08:59:17 ldap-server slapd[1464]: <= acl_mask: [1] mask: manage(=mwrscxd)
Oct 19 08:59:17 ldap-server slapd[1464]: => slap_access_allowed: add access granted by manage(=mwrscxd)
Oct 19 08:59:17 ldap-server slapd[1464]: => access_allowed: add access granted by manage(=mwrscxd)
Oct 19 08:59:17 ldap-server slapd[1464]: => access_allowed: result not in cache (olcTLSCertificateKeyFile)
Oct 19 08:59:17 ldap-server slapd[1464]: => access_allowed: delete access to "cn=config" "olcTLSCertificateKeyFile" requested
Oct 19 08:59:17 ldap-server slapd[1464]: => acl_get: [1] attr olcTLSCertificateKeyFile
Oct 19 08:59:17 ldap-server slapd[1464]: => acl_mask: access to entry "cn=config", attr "olcTLSCertificateKeyFile" requested
Oct 19 08:59:17 ldap-server slapd[1464]: => acl_mask: to all values by "gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth", (=0)
Oct 19 08:59:17 ldap-server slapd[1464]: <= check a_dn_pat: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
Oct 19 08:59:17 ldap-server slapd[1464]: <= acl_mask: [1] applying
manage(=mwrscxd) (stop)
Oct 19 08:59:17 ldap-server slapd[1464]: <= acl_mask: [1] mask: manage(=mwrscxd)
Oct 19 08:59:17 ldap-server slapd[1464]: => slap_access_allowed: delete access granted by manage(=mwrscxd)
Oct 19 08:59:17 ldap-server slapd[1464]: => access_allowed: delete access granted by manage(=mwrscxd)
Oct 19 08:59:17 ldap-server slapd[1464]: => access_allowed: result not in cache (olcTLSCertificateKeyFile)
Oct 19 08:59:17 ldap-server slapd[1464]: => access_allowed: add access to "cn=config" "olcTLSCertificateKeyFile" requested
Oct 19 08:59:17 ldap-server slapd[1464]: => acl_get: [1] attr olcTLSCertificateKeyFile
Oct 19 08:59:17 ldap-server slapd[1464]: => acl_mask: access to entry "cn=config", attr "olcTLSCertificateKeyFile" requested
Oct 19 08:59:17 ldap-server slapd[1464]: => acl_mask: to value by "gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth", (=0)
Oct 19 08:59:17 ldap-server slapd[1464]: <= check a_dn_pat: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
Oct 19 08:59:17 ldap-server slapd[1464]: <= acl_mask: [1] applying manage(=mwrscxd) (stop)
Oct 19 08:59:17 ldap-server slapd[1464]: <= acl_mask: [1] mask: manage(=mwrscxd)
Oct 19 08:59:17 ldap-server slapd[1464]: => slap_access_allowed: add access granted by manage(=mwrscxd)
Oct 19 08:59:17 ldap-server slapd[1464]: => access_allowed: add access granted by manage(=mwrscxd)
Oct 19 08:59:17 ldap-server slapd[1464]: slap_queue_csn: queueing 0x7f104bffc340 20181019065917.048487Z#000000#000#000000
Oct 19 08:59:17 ldap-server slapd[1464]: oc_check_required entry (cn=config), objectClass "olcGlobal"
Oct 19 08:59:17 ldap-server slapd[1464]: oc_check_allowed type "objectClass"
Oct 19 08:59:17 ldap-server slapd[1464]: oc_check_allowed type "cn"
Oct 19 08:59:17 ldap-server slapd[1464]: oc_check_allowed type "olcArgsFile"
Oct 19 08:59:17 ldap-server slapd[1464]: oc_check_allowed type "olcLogLevel"
Oct 19 08:59:17 ldap-server slapd[1464]: oc_check_allowed type
"olcPidFile"
Oct 19 08:59:17 ldap-server slapd[1464]: oc_check_allowed type "olcToolThreads"
Oct 19 08:59:17 ldap-server slapd[1464]: oc_check_allowed type "structuralObjectClass"
Oct 19 08:59:17 ldap-server slapd[1464]: oc_check_allowed type "entryUUID"
Oct 19 08:59:17 ldap-server slapd[1464]: oc_check_allowed type "creatorsName"
Oct 19 08:59:17 ldap-server slapd[1464]: oc_check_allowed type "createTimestamp"
Oct 19 08:59:17 ldap-server slapd[1464]: oc_check_allowed type "olcTLSCACertificateFile"
Oct 19 08:59:17 ldap-server slapd[1464]: oc_check_allowed type "olcTLSCertificateFile"
Oct 19 08:59:17 ldap-server slapd[1464]: oc_check_allowed type "olcTLSCertificateKeyFile"
Oct 19 08:59:17 ldap-server slapd[1464]: oc_check_allowed type "entryCSN"
Oct 19 08:59:17 ldap-server slapd[1464]: oc_check_allowed type "modifiersName"
Oct 19 08:59:17 ldap-server slapd[1464]: oc_check_allowed type "modifyTimestamp"
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: activity on 1 descriptor
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: activity on:
Oct 19 08:59:17 ldap-server slapd[1464]:
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: epoll: listen=9 active_threads=0 tvp=zero
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: epoll: listen=10 active_threads=0 tvp=zero
Oct 19 08:59:17 ldap-server slapd[1464]: daemon: epoll: listen=11 active_threads=0 tvp=zero
And last but not least.. Here is the output of my
netstat -tulpan
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
992/sshd
tcp 0 0 0.0.0.0:636 0.0.0.0:* LISTEN 1535/slapd
tcp 0 0 0.0.0.0:389 0.0.0.0:* LISTEN 1535/slapd
UPDATE:
I´ve configured my ldap-client maschine to use ldaps (bevore configuring ldaps everything works fine via ldap :389)
- Added the CA.crt from the ldap server and trust this like described above
- Chnged the
/etc/ldap/ldap.confand added the path to the new trusted CA.crt - Changed the
/etc/ldap.confto use ldaps and uncommented the line ssl start_tls - changed ldap uri wth executing the command
sudo dpkg-reconfigure ldap-auth-config
I´ve restarted the client maschine and opened a tcpdump on my ldap server listening for the ip of the client ans all connections for the portrange 389-636
10:00:27.149772 IP ldap-client.52803 > ldap-server.ldaps: Flags [S], seq 1684570111, win 29200, options [mss 1460,sackOK,TS val 4294902186 ecr 0,nop,wscale 7], length 0
10:00:27.149813 IP ldap-server.ldaps > ldap-client.52803: Flags [S.], seq 3586026827, ack 1684570112, win 28960, options [mss 1460,sackOK,TS val 1292850 ecr 4294902186,nop,wscale 7], length 0
10:00:27.149924 IP ldap-client.52803 > ldap-server.ldaps: Flags [.], ack 1, win 229, options [nop,nop,TS val 4294902186 ecr 1292850], length 0
10:00:27.151549 IP ldap-client.52803 > ldap-server.ldaps: Flags [P.], seq 1:118, ack 1, win 229, options [nop,nop,TS val 4294902186 ecr 1292850], length 117
10:00:27.151567 IP ldap-server.ldaps > ldap-client.52803: Flags [.], ack 118, win 227, options [nop,nop,TS val 1292850 ecr 4294902186], length 0
10:00:27.151949 IP ldap-server.ldaps > ldap-client.52803: Flags [F.], seq 1, ack 118, win 227, options [nop,nop,TS val 1292850 ecr 4294902186], length 0
10:00:27.152095 IP ldap-client.52803 > ldap-server.ldaps: Flags [.], ack 2, win 229, options [nop,nop,TS val 4294902187 ecr 1292850], length 0
10:00:27.152157 IP ldap-client.52803 > ldap-server.ldaps: Flags [F.], seq 118, ack 2, win 229, options [nop,nop,TS val 4294902187 ecr 1292850], length 0
10:00:27.152174 IP ldap-server.ldaps > ldap-client.52803: Flags [.], ack 119, win 227, options [nop,nop,TS val 1292850 ecr 4294902187], length 0
10:00:27.152288 IP ldap-client.52804 > ldap-server.ldaps: Flags [S], seq 1697088540, win 29200, options [mss 1460,sackOK,TS val 4294902187 ecr 0,nop,wscale 7], length 0
10:00:27.152305 IP ldap-server.ldaps > ldap-client.52804: Flags [S.], seq 2792459463, ack 1697088541, win 28960, options [mss 1460,sackOK,TS val 1292850 ecr 4294902187,nop,wscale 7], length 0
10:00:27.152360 IP ldap-client.52804 > ldap-server.ldaps: Flags [.], ack 1, win 229, options [nop,nop,TS val 4294902187 ecr 1292850], length 0
10:00:27.152502 IP ldap-client.52804 > ldap-server.ldaps: Flags [P.], seq 1:118, ack 1, win 229, options [nop,nop,TS val 4294902187 ecr 1292850], length 117
10:00:27.152512 IP ldap-server.ldaps > ldap-client.52804: Flags [.], ack 118, win 227, options [nop,nop,TS val 1292850 ecr 4294902187], length 0
10:00:27.152909 IP ldap-server.ldaps > ldap-client.52804: Flags [F.], seq 1, ack 118, win 227, options [nop,nop,TS val 1292850 ecr 4294902187], length 0
10:00:27.152998 IP ldap-client.52804 > ldap-server.ldaps: Flags [F.], seq 118, ack 2, win 229, options [nop,nop,TS val 4294902187 ecr 1292850], length 0
10:00:27.153010 IP ldap-server.ldaps > ldap-client.52804: Flags [.], ack 119, win 227, options [nop,nop,TS val 1292850 ecr 4294902187], length 0
10:00:28.153396 IP ldap-client.52805 > ldap-server.ldaps: Flags [S], seq 592612370, win 29200, options [mss 1460,sackOK,TS val 4294902437 ecr 0,nop,wscale 7], length 0
10:00:28.153437 IP ldap-server.ldaps > ldap-client.52805: Flags [S.], seq 1983710944, ack 592612371, win 28960, options [mss 1460,sackOK,TS val 1293101 ecr 4294902437,nop,wscale 7], length 0
10:00:28.153580 IP ldap-client.52805 > ldap-server.ldaps: Flags [.], ack 1, win 229, options [nop,nop,TS val 4294902437 ecr 1293101], length 0
10:00:28.153759 IP ldap-client.52805 > ldap-server.ldaps: Flags [P.], seq 1:118, ack 1, win 229, options [nop,nop,TS val 4294902437 ecr 1293101], length 117
10:00:28.153767 IP ldap-server.ldaps > ldap-client.52805: Flags [.], ack 118, win 227, options [nop,nop,TS val 1293101 ecr 4294902437], length 0
10:00:28.154285 IP ldap-server.ldaps > ldap-client.52805: Flags [F.], seq 1, ack 118, win 227, options [nop,nop,TS val 1293101 ecr 4294902437], length 0
10:00:28.154413 IP ldap-client.52805 > ldap-server.ldaps: Flags [F.], seq 118, ack 2, win 229, options [nop,nop,TS val 4294902437 ecr 1293101], length 0
10:00:28.154423 IP ldap-server.ldaps > ldap-client.52805: Flags [.], ack 119, win 227, options [nop,nop,TS val 1293101 ecr 4294902437], length 0
^C
513 packets captured
513 packets received by filter
0 packets dropped by kernel
61 packets dropped by interface
I hope someone knows my problem and can help me 🙂
Kind Regards
Tabby
Best Answer
This is not a real answer, but I'm missing the 50 reputation points to add a comment:
You may gain insight on the error if you debug from a client perspective using:
This may reveal information about certificate errors which I suspect. Also, since you're using Ubuntu, make sure that AppArmor is not blocking access to the certificate by adding the following to your
/etc/ldap/ssl/filesat the end:You can check for AppArmor errors via
journalctl -xaeu apparmor.You can check whether the
openldapuser really can read files needed for authentication by issueing:Also you should never use LDAPS, but LDAP+STARTTLS as described in Best Practices in LDAP Security by Andrew Findlay.
Also please try to make your post more readable by adding 4 spaces in front of text that is intended to be displayed as monospace.