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Re: Pass-through authentication to Active Directory when using saslbind




On 20 October 2013 00:00, ClÃment OUDOT <clem.oudot@gmail.com> wrote:



2013/10/19 Jesus Jr M Salvo <jesus.m.salvo@gmail.com>
Hi All,

First off, I am a beginner with OpenLDAP, so please bear with me as I try to explain what I am trying to achieve.

1) There are 2 Active Directory servers that I need to connect to. Both of these are NOT under my control. We shall call them AD1 and AD2 here.

2) I can connect to AD1 via testsaslauthd using both simple bind and saslbind using DIGEST-MD5.

2a) For simple bind, I know of an adminstrative read-only account that I use to perform the initial LDAP bind request in order to allow an LDAP searchRequest to authenticate any user with AD1. Below is a sample /etc/saslauthd.conf ( ldap_bind_dn and ldap_bind_pw altered slightly to protect the identity )

###################################################################
#/etc/saslauthd.conf
ldap_servers: ldap://172.21.128.49:3268
ldap_default_domain: ad1.priv
ldap_search_base: DC=ad1,DC=priv
ldap_bind_dn: CN=administrativero,OU=Service_Accounts,DC=ad1,DC=priv
ldap_bind_pw: readonly
ldap_deref: never
ldap_restart: yes
ldap_scope: sub
ldap_use_sasl: no
ldap_start_tls: no
ldap_version: 3
ldap_auth_method: bind
ldap_filter: sAMAccountName=%u
ldap_password_attr: userPassword
ldap_timeout: 10
ldap_cache_ttl: 30
ldap_cache_mem: 32768
#########################################################################

$ testsaslauthd -u salvojo -p mypassword
0: OK "Success."

... and what was captured by tshark ( I included port 53 for DNS queries as it was essential for finding out why digest-uri was only IP addresses instead of the hostname later on ):

$ sudo tshark -i any port 3268 or port 53 or port 389
<...time elapsed .. snipped..>
81336.300597 172.21.17.193 -> 172.21.128.49 TCP 76 44477 > msft-gc [SYN] Seq=0 Win=14600 Len=0 MSS=1460 SACK_PERM=1 TSval=50014473 TSecr=0 WS=128
81336.301498 172.21.128.49 -> 172.21.17.193 TCP 80 msft-gc > 44477 [SYN, ACK] Seq=0 Ack=1 Win=64512 Len=0 MSS=1460 WS=1 TSval=0 TSecr=0 SACK_PERM=1
81336.301626 172.21.17.193 -> 172.21.128.49 TCP 68 44477 > msft-gc [ACK] Seq=1 Ack=1 Win=14720 Len=0 TSval=50014474 TSecr=0
81336.301840 172.21.17.193 -> 172.21.128.49 LDAP 141 bindRequest(1) "CN=administrativero,OU=Service_Accounts,DC=ad1,DC=priv" simple
81336.304464 172.21.128.49 -> 172.21.17.193 LDAP 90 bindResponse(1) success
81336.304559 172.21.17.193 -> 172.21.128.49 TCP 68 44477 > msft-gc [ACK] Seq=74 Ack=23 Win=14720 Len=0 TSval=50014474 TSecr=5446546
81336.304930 172.21.17.193 -> 172.21.128.49 LDAP 139 searchRequest(2) "DC=ad1,DC=priv" wholeSubtree
81336.305702 172.21.128.49 -> 172.21.17.193 LDAP 175 searchResEntry(2) "CN=John Salvo,OU=Users,OU=_Windows7 Pilot Group,DC=ad1,DC=priv" Â| searchResDone(2) success
81336.305972 172.21.17.193 -> 172.21.128.49 LDAP 154 bindRequest(3) "CN=John Salvo,OU=Users,OU=_Windows7 Pilot Group,DC=ad1,DC=priv" simple
81336.308982 172.21.128.49 -> 172.21.17.193 LDAP 90 bindResponse(3) success
81336.349661 172.21.17.193 -> 172.21.128.49 TCP 68 44477 > msft-gc [ACK] Seq=231 Ack=152 Win=14720 Len=0 TSval=50014486 TSecr=5446547


2b) For saslbind using DIGEST-MD5, I have no need for the administrative read-only account, as shown below by my /etc/saslauthd.conf: ( saslauthd was restarted in each case when saslauthd.conf was changed )

###################################################################
#/etc/saslauthd.conf
ldap_servers: ldap://172.21.128.49:3268
ldap_deref: never
ldap_restart: yes
ldap_scope: sub
ldap_use_sasl: yes
ldap_mech: DIGEST-MD5
ldap_start_tls: no
ldap_version: 3
ldap_timeout: 10
ldap_cache_ttl: 30
ldap_cache_mem: 32768
#########################################################################

$ testsaslauthd -u salvojo -p mypassword
0: OK "Success."

$ sudo tshark -i any port 3268 or port 53 or port 389
<...time elapsed .. snipped..>
 7.488292 172.21.17.193 -> 172.21.128.49 TCP 76 44478 > msft-gc [SYN] Seq=0 Win=14600 Len=0 MSS=1460 SACK_PERM=1 TSval=50082984 TSecr=0 WS=128
 7.489163 172.21.128.49 -> 172.21.17.193 TCP 80 msft-gc > 44478 [SYN, ACK] Seq=0 Ack=1 Win=64512 Len=0 MSS=1460 WS=1 TSval=0 TSecr=0 SACK_PERM=1
 7.489258 172.21.17.193 -> 172.21.128.49 TCP 68 44478 > msft-gc [ACK] Seq=1 Ack=1 Win=14720 Len=0 TSval=50082985 TSecr=0
 7.489757 172.21.17.193 -> 172.21.10.24 DNS 88 Standard query PTR 49.128.21.172.in-addr.arpa
 7.490577 172.21.10.24 -> 172.21.17.193 DNS 120 Standard query response PTR aassydc01.ad1.priv
 7.492610 172.21.17.193 -> 172.21.128.49 LDAP 94 bindRequest(1) "<ROOT>" sasl
 7.493828 172.21.128.49 -> 172.21.17.193 LDAP 326 bindResponse(1) saslBindInProgress
 7.493928 172.21.17.193 -> 172.21.128.49 TCP 68 44478 > msft-gc [ACK] Seq=27 Ack=259 Win=15744 Len=0 TSval=50082986 TSecr=5449287
 7.494828 172.21.17.193 -> 172.21.128.49 LDAP 442 bindRequest(2) "<ROOT>" sasl
 7.498503 172.21.128.49 -> 172.21.17.193 LDAP 132 bindResponse(2) success
 7.536572 172.21.17.193 -> 172.21.128.49 TCP 68 44478 > msft-gc [ACK] Seq=401 Ack=323 Win=15744 Len=0 TSval=50082997 TSecr=5449287

All good so far with simple bind and saslauthd to AD1. Â
Â
3) I can only connect to AD2, the second active directory server, via testsaslauthd using only sasl bind.

That is because I do not know of an adminstrative read-only account in AD2 that I can use to perform the initial LDAP bindRequest in order to allow an LDAP searchRequest. Here is the /etc/saslauthd.conf for saslbind to AD2:

###################################################################
#/etc/saslauthd.conf
# Your AD server adress
# NOTE: This will only work IFF there is also a reverse DNS entry for this A record
# Otherwise, the digest-uri in the LDAP SASL bind request will only contain the IP address instead of the hostname
# which will result in "The digest-uri does not match any LDAP SPN's registered for this server"
ldap_servers: ldap://ad2idcdc11.au.ad2.corp:3268
ldap_deref: never
ldap_restart: yes
ldap_scope: sub
ldap_start_tls: no
ldap_version: 3
ldap_use_sasl: yes
ldap_mech: DIGEST-MD5
ldap_timeout: 10
ldap_cache_ttl: 30
ldap_cache_mem: 32768
#EOF
#########################################################################

$ testsaslauthd -u anotheruser -p otherpassword
0: OK "Success."

$ sudo tshark -i any port 3268 or port 53 or port 389
<...time elapsed .. snipped..>
321.883648 172.21.17.193 -> 10.3.90.55 Â TCP 76 49226 > msft-gc [SYN] Seq=0 Win=14600 Len=0 MSS=1460 SACK_PERM=1 TSval=50161583 TSecr=0 WS=128
321.884343 Â 10.3.90.55 -> 172.21.17.193 TCP 80 msft-gc > 49226 [SYN, ACK] Seq=0 Ack=1 Win=16384 Len=0 MSS=1460 WS=1 TSval=0 TSecr=0 SACK_PERM=1
321.884541 172.21.17.193 -> 10.3.90.55 Â TCP 68 49226 > msft-gc [ACK] Seq=1 Ack=1 Win=14720 Len=0 TSval=50161583 TSecr=0
321.886323 172.21.17.193 -> 10.3.90.55 Â LDAP 94 bindRequest(1) "<ROOT>" sasl
321.887247 Â 10.3.90.55 -> 172.21.17.193 LDAP 329 bindResponse(1) saslBindInProgress
321.887336 172.21.17.193 -> 10.3.90.55 Â TCP 68 49226 > msft-gc [ACK] Seq=27 Ack=262 Win=15744 Len=0 TSval=50161584 TSecr=65953794
321.888296 172.21.17.193 -> 10.3.90.55 Â LDAP 447 bindRequest(2) "<ROOT>" sasl
321.892567 Â 10.3.90.55 -> 172.21.17.193 LDAP 132 bindResponse(2) success
321.933533 172.21.17.193 -> 10.3.90.55 Â TCP 68 49226 > msft-gc [ACK] Seq=406 Ack=326 Win=15744 Len=0 TSval=50161596 TSecr=65953794


4) I am using SASL because I currently have Subversion 1.8 configured to use SASL to authenticate users to AD1, but currently using simple bind. I will be changing this later on so that saslauthd will use sasl bind to AD1.

$ cat /etc/sasl2/svn.conf
pwcheck_method: saslauthd
mech_list: PLAIN


-----------------------------------------------------
Now here is what I am trying to achieve with OpenLDAP:

I am using slapd.conf.
I am also using the meta backend, as my instance of OpenLDAP will not really have its own LDAP database as I intended to use OpenLDAP for pass-through authentication.

5) I am able to use OpenLDAP as a proxy to AD1 for pass-through authentication via the meta backend, but only if OpenLDAP is configured to use simplebind to AD1. That is: testsaslauthd ( simple bind ) -> OpenLDAP ( simple bind ) -> AD1.

Here is my /etc/ldap/slapd.conf:

#########################################################################
include     /etc/ldap/schema/core.schema
include     /etc/ldap/schema/cosine.schema
include     /etc/ldap/schema/nis.schema
include     /etc/ldap/schema/inetorgperson.schema
pidfile     /var/run/slapd/slapd.pid
argsfile    Â/var/run/slapd/slapd.args
loglevel    Âstats
modulepath   Â/usr/lib/ldap
moduleload   Âback_meta.so
moduleload   Âback_ldap.so
sizelimit 500
tool-threads 1
backend     meta
database    Âmeta
access to *
    by * read
suffix     Â"dc=ad1,dc=priv"
uri       ldap://172.21.128.49:3268/dc=ad1,dc=priv
chase-referrals no
lastmod    off
protocol-version Â3
#########################################################################

.. and here is my /etc/saslauthd.conf for this specific test:
( The only difference between this and [2a] is the ldap_servers entry, which now points to OpenLDAP, and the ldap_filter, which now has an OR condition )

###################################################################
#/etc/saslauthd.conf
#
# Your AD server adress
ldap_servers: ldap://127.0.0.1:389
ldap_default_domain: ad1.priv
ldap_search_base: DC=ad1,DC=priv
ldap_bind_dn: CN=administrativero,OU=Service_Accounts,DC=ad1,DC=priv
ldap_bind_pw: readonly
ldap_deref: never
ldap_restart: yes
ldap_scope: sub
ldap_use_sasl: no
ldap_start_tls: no
ldap_version: 3
ldap_auth_method: bind
ldap_filter: (|(uid=%U)(sAMAccountName=%U))
ldap_password_attr: userPassword
ldap_timeout: 10
ldap_cache_ttl: 30
ldap_cache_mem: 32768
#EOF
#########################################################################

$ testsaslauthd -u salvojo -p mypassword
0: OK "Success."

$ sudo tshark -i any port 3268 or port 53 or port 389
<...time elapsed .. snipped..>
1310.330189 Â Â127.0.0.1 -> 127.0.0.1 Â ÂTCP 76 50279 > ldap [SYN] Seq=0 Win=32792 Len=0 MSS=16396 SACK_PERM=1 TSval=50408695 TSecr=0 WS=128
1310.330234 Â Â127.0.0.1 -> 127.0.0.1 Â ÂTCP 76 ldap > 50279 [SYN, ACK] Seq=0 Ack=1 Win=32768 Len=0 MSS=16396 SACK_PERM=1 TSval=50408695 TSecr=50408695 WS=128
1310.330262 Â Â127.0.0.1 -> 127.0.0.1 Â ÂTCP 68 50279 > ldap [ACK] Seq=1 Ack=1 Win=32896 Len=0 TSval=50408695 TSecr=50408695
1310.330612 Â Â127.0.0.1 -> 127.0.0.1 Â ÂLDAP 141 bindRequest(1) "CN=administrativero,OU=Service_Accounts,DC=ad1,DC=priv" simple
1310.330640 Â Â127.0.0.1 -> 127.0.0.1 Â ÂTCP 68 ldap > 50279 [ACK] Seq=1 Ack=74 Win=32768 Len=0 TSval=50408695 TSecr=50408695
1310.331106 172.21.17.193 -> 172.21.128.49 TCP 76 44485 > msft-gc [SYN] Seq=0 Win=14600 Len=0 MSS=1460 SACK_PERM=1 TSval=50408695 TSecr=0 WS=128
1310.332041 172.21.128.49 -> 172.21.17.193 TCP 80 msft-gc > 44485 [SYN, ACK] Seq=0 Ack=1 Win=64512 Len=0 MSS=1460 WS=1 TSval=0 TSecr=0 SACK_PERM=1
1310.332129 172.21.17.193 -> 172.21.128.49 TCP 68 44485 > msft-gc [ACK] Seq=1 Ack=1 Win=14720 Len=0 TSval=50408695 TSecr=0
1310.332239 172.21.17.193 -> 172.21.128.49 LDAP 141 bindRequest(1) "cn=administrativero,ou=Service_Accounts,dc=ad1,dc=priv" simple
1310.335445 172.21.128.49 -> 172.21.17.193 LDAP 90 bindResponse(1) success
1310.335575 172.21.17.193 -> 172.21.128.49 TCP 68 44485 > msft-gc [ACK] Seq=74 Ack=23 Win=14720 Len=0 TSval=50408696 TSecr=5462316
1310.336554 Â Â127.0.0.1 -> 127.0.0.1 Â ÂLDAP 82 bindResponse(1) success
1310.336634 Â Â127.0.0.1 -> 127.0.0.1 Â ÂTCP 68 50279 > ldap [ACK] Seq=74 Ack=15 Win=32896 Len=0 TSval=50408697 TSecr=50408697
1310.336863 Â Â127.0.0.1 -> 127.0.0.1 Â ÂLDAP 157 searchRequest(2) "DC=ad1,DC=priv" wholeSubtree
1310.337809 172.21.17.193 -> 172.21.128.49 LDAP 157 searchRequest(2) "dc=ad1,dc=priv" wholeSubtree
1310.339277 172.21.128.49 -> 172.21.17.193 LDAP 175 searchResEntry(2) "CN=John Salvo,OU=Users,OU=_Windows7 Pilot Group,DC=ad1,DC=priv" Â| searchResDone(2) success
1310.339581 Â Â127.0.0.1 -> 127.0.0.1 Â ÂLDAP 141 searchResEntry(2) "cn=John Salvo,ou=Users,ou=_Windows7 Pilot Group,dc=ad1,dc=priv"
1310.339871 Â Â127.0.0.1 -> 127.0.0.1 Â ÂLDAP 82 searchResDone(2) success
1310.339966 Â Â127.0.0.1 -> 127.0.0.1 Â ÂTCP 68 50279 > ldap [ACK] Seq=163 Ack=102 Win=32896 Len=0 TSval=50408697 TSecr=50408697
1310.340053 Â Â127.0.0.1 -> 127.0.0.1 Â ÂLDAP 154 bindRequest(3) "cn=John Salvo,ou=Users,ou=_Windows7 Pilot Group,dc=ad1,dc=priv" simple
1310.340698 172.21.17.193 -> 172.21.128.49 TCP 76 44486 > msft-gc [SYN] Seq=0 Win=14600 Len=0 MSS=1460 SACK_PERM=1 TSval=50408698 TSecr=0 WS=128
1310.341883 172.21.128.49 -> 172.21.17.193 TCP 80 msft-gc > 44486 [SYN, ACK] Seq=0 Ack=1 Win=64512 Len=0 MSS=1460 WS=1 TSval=0 TSecr=0 SACK_PERM=1
1310.341977 172.21.17.193 -> 172.21.128.49 TCP 68 44486 > msft-gc [ACK] Seq=1 Ack=1 Win=14720 Len=0 TSval=50408698 TSecr=0
1310.342157 172.21.17.193 -> 172.21.128.49 LDAP 154 bindRequest(1) "cn=John Salvo,ou=Users,ou=_Windows7 Pilot Group,dc=ad1,dc=priv" simple
1310.345643 172.21.128.49 -> 172.21.17.193 LDAP 90 bindResponse(1) success
1310.345733 172.21.17.193 -> 172.21.128.49 TCP 68 44486 > msft-gc [ACK] Seq=87 Ack=23 Win=14720 Len=0 TSval=50408699 TSecr=5462316
1310.346198 Â Â127.0.0.1 -> 127.0.0.1 Â ÂLDAP 82 bindResponse(3) success
1310.377558 172.21.17.193 -> 172.21.128.49 TCP 68 44485 > msft-gc [ACK] Seq=163 Ack=130 Win=14720 Len=0 TSval=50408707 TSecr=5462316
1310.384549 Â Â127.0.0.1 -> 127.0.0.1 Â ÂTCP 68 50279 > ldap [ACK] Seq=249 Ack=116 Win=32896 Len=0 TSval=50408709 TSecr=50408699

You can see from the above that:
* The initial administrative simple bind to OpenLDAP was delegated by OpenLDAP to AD1.
* The searchRequest to OpenLDAp was delegated by OpenLDAP to AD1.
* The second bindRequest ( that is authenticating the user that I specified with testsaslauthd ) to OpenLDAP was delegated by OpenLDAP to AD1.

That is, on all 3 cases above, OpenLDAP only returned success back to testsaslauthd only if AD1 only returned success.
So far so good.



6) I am unable to use ... or rather confused on how to use .. OpenLDAP as a proxy to AD1 so that OpenLDAP will use sasl bind to AD1.

This is where I am stuck.
Here is my /etc/saslauthd.conf for this test: The only difference between this and saslauthd.conf in [2b] is the ldap_servers entry, which is now pointing to OpenLDAP.

###################################################################
#/etc/saslauthd.conf
#
# Your AD server adress
ldap_servers: ldap://127.0.0.1:389
ldap_deref: never
ldap_restart: yes
ldap_scope: sub
ldap_use_sasl: yes
ldap_mech: DIGEST-MD5
ldap_start_tls: no
ldap_version: 3
ldap_timeout: 10
ldap_cache_ttl: 30
ldap_cache_mem: 32768
#EOF
#########################################################################

Here is my /etc/ldap/slapd.conf for this test: ( The only difference between this file and the slapd.conf file in [5] is the addition of the idassert-bind line )

#########################################################################
include     /etc/ldap/schema/core.schema
include     /etc/ldap/schema/cosine.schema
include     /etc/ldap/schema/nis.schema
include     /etc/ldap/schema/inetorgperson.schema
pidfile     /var/run/slapd/slapd.pid
argsfile    Â/var/run/slapd/slapd.args
loglevel    Âstats
modulepath   Â/usr/lib/ldap
moduleload   Âback_meta.so
moduleload   Âback_ldap.so
sizelimit 500
tool-threads 1
backend     meta
database    Âmeta
access to *
    by * read
suffix     Â"dc=ad1,dc=priv"
uri       ldap://172.21.128.49:3268/dc=ad1,dc=priv
chase-referrals no
lastmod    off
protocol-version Â3
idassert-bind bindmethod=sasl saslmech=DIGEST-MD5 mode=none
#########################################################################


$ testsaslauthd -u salvojo -p mypassword
0: NO "authentication failed"

$ sudo tshark -i any port 3268 or port 53 or port 389
<...time elapsed .. snipped..>
401.111261 Â Â127.0.0.1 -> 127.0.0.1 Â ÂTCP 76 50299 > ldap [SYN] Seq=0 Win=32792 Len=0 MSS=16396 SACK_PERM=1 TSval=51388330 TSecr=0 WS=128
401.111304 Â Â127.0.0.1 -> 127.0.0.1 Â ÂTCP 76 ldap > 50299 [SYN, ACK] Seq=0 Ack=1 Win=32768 Len=0 MSS=16396 SACK_PERM=1 TSval=51388330 TSecr=51388330 WS=128
401.111332 Â Â127.0.0.1 -> 127.0.0.1 Â ÂTCP 68 50299 > ldap [ACK] Seq=1 Ack=1 Win=32896 Len=0 TSval=51388330 TSecr=51388330
401.113332 Â Â127.0.0.1 -> 127.0.0.1 Â ÂLDAP 94 bindRequest(1) "<ROOT>" sasl
401.113419 Â Â127.0.0.1 -> 127.0.0.1 Â ÂTCP 68 ldap > 50299 [ACK] Seq=1 Ack=27 Win=32768 Len=0 TSval=51388330 TSecr=51388330
401.113806 Â Â127.0.0.1 -> 127.0.0.1 Â ÂLDAP 304 bindResponse(1) saslBindInProgress (SASL(0): successful result: )
401.114023 Â Â127.0.0.1 -> 127.0.0.1 Â ÂTCP 68 50299 > ldap [ACK] Seq=27 Ack=237 Win=32768 Len=0 TSval=51388331 TSecr=51388330
401.114362 Â Â127.0.0.1 -> 127.0.0.1 Â ÂLDAP 393 bindRequest(2) "<ROOT>" sasl
401.114671 Â Â127.0.0.1 -> 127.0.0.1 Â ÂLDAP 130 bindResponse(2) invalidCredentials (SASL(-13): user not found: no secret in database)
401.153939 Â Â127.0.0.1 -> 127.0.0.1 Â ÂTCP 68 50299 > ldap [ACK] Seq=352 Ack=299 Win=32768 Len=0 TSval=51388341 TSecr=51388331

As you can see from the above tshark, OpenLDAP did not even try to communicate at all to AD1 !
What should I have in slapd.conf ?
Maybe the problem is that, I am using testsaslauthd, which uses saslauthd to connect to OpenLDAP, but also need OpenLDAP to use saslauthd to AD1 ( e.g. It is using the same saslauthd daemon ) ?

I also read about at ( Section 14.5 ):

http://www.openldap.org/doc/admin24/security.html
... about setting the userPassword attribute to something of the form:

userPassword: {SASL}user@realm
... but:

*) I am using a meta backend, and thus I have no internal users, so I cannot set the userPassword attribute .... or is this saying that I need a "copy" of the DN name of the users from AD1 to my local OpenLDAP ?

It also says:

"Since OpenLDAP 2.0 slapd has had the ability to delegate password verification to a separate **PROCESS** ( emphasis mine ). This uses the sasl_checkpass(3) function so it can use any back-end server that Cyrus SASL supports for checking passwords."
.. but:

*) How was OpenLDAP able to delegate password verification in the simple-bind proxy as I have demonstrated above WITHOUT going through a separate proccess but going straight through a TCP/IP connection ?
*) Is the statement saying that OpenLDAP will use saslauthd to connect to a remote LDAP/AD ? If so, since I am using testsaslauthd and I am already using saslauthd to connect to OpenLDAP, and saslauthd.conf is configured to point to the local OpenLDAP, does this mean I need another instance of saslauthd with its own unix socket and its own saslauthd.conf ? If so, what's the point of having the uri in slapd.conf when the separate instance of saslauthd.conf will have its own entry of the remote ldap / AD1 anyway ?

Anyway, as you can see .. I am confused on how to do item [6] above.
All I really need to happen is ( from a tcp capture / wireshark perspective ), something like ( similar to the simple bind PTA ):

Â127.0.0.1 -> 127.0.0.1 TCP 76 44478 > msft-gc [SYN] Seq=0 Win=14600 Len=0 MSS=1460 SACK_PERM=1 TSval=50082984 TSecr=0 WS=128
Â127.0.0.1 -> 127.0.0.1 TCP 80 msft-gc > 44478 [SYN, ACK] Seq=0 Ack=1 Win=64512 Len=0 MSS=1460 WS=1 TSval=0 TSecr=0 SACK_PERM=1
Â127.0.0.1 -> 127.0.0.1 TCP 68 44478 > msft-gc [ACK] Seq=1 Ack=1 Win=14720 Len=0 TSval=50082985 TSecr=0
Â127.0.0.1 -> 127.0.0.1 LDAP 94 bindRequest(1) "<ROOT>" sasl
Â172.21.17.193 -> 172.21.128.49 TCP 76 44478 > msft-gc [SYN] Seq=0 Win=14600 Len=0 MSS=1460 SACK_PERM=1 TSval=50082984 TSecr=0 WS=128
Â172.21.128.49 -> 172.21.17.193 TCP 80 msft-gc > 44478 [SYN, ACK] Seq=0 Ack=1 Win=64512 Len=0 MSS=1460 WS=1 TSval=0 TSecr=0 SACK_PERM=1
Â172.21.17.193 -> 172.21.128.49 TCP 68 44478 > msft-gc [ACK] Seq=1 Ack=1 Win=14720 Len=0 TSval=50082985 TSecr=0
Â172.21.17.193 -> 172.21.128.49 LDAP 94 bindRequest(1) "<ROOT>" sasl
Â172.21.128.49 -> 172.21.17.193 LDAP 326 bindResponse(1) saslBindInProgress
Â172.21.17.193 -> 172.21.128.49 TCP 68 44478 > msft-gc [ACK] Seq=27 Ack=259 Win=15744 Len=0 TSval=50082986 TSecr=5449287
Â127.0.0.1 -> 127.0.0.1 LDAP 326 bindResponse(1) saslBindInProgress
Â127.0.0.1 -> 127.0.0.1 TCP 68 44478 > msft-gc [ACK] Seq=27 Ack=259 Win=15744 Len=0 TSval=50082986 TSecr=5449287
Â127.0.0.1 -> 127.0.0.1 LDAP 442 bindRequest(2) "<ROOT>" sasl
Â172.21.17.193 -> 172.21.128.49 LDAP 442 bindRequest(2) "<ROOT>" sasl
Â172.21.128.49 -> 172.21.17.193 LDAP 132 bindResponse(2) success
Â172.21.17.193 -> 172.21.128.49 TCP 68 44478 > msft-gc [ACK] Seq=401 Ack=323 Win=15744 Len=0 TSval=50082997 TSecr=5449287
Â127.0.0.1 -> 127.0.0.1 LDAP 132 bindResponse(2) success
Â127.0.0.1 -> 127.0.0.1 TCP 68 44478 > msft-gc [ACK] Seq=401 Ack=323 Win=15744 Len=0 TSval=50082997 TSecr=5449287

7) If I can find out how to do item [6] above with help from this list, then I will try to do the same for AD2.

8) The end goal therefore is to use OpenLDAP as a dumb proxy that will authenticate users to either AD1 or AD2.

Any help / hints appreciated,





Hello,

A possible process is: LDAP Client ---BIND--> OpenLDAP ---sasl---> saslauthd ---BIND--> AD

ClÃment.

Hi there,

I actually used that link / your example as the basis for my tests. Thanks for the info you published.
From what I can summarise in your work, you have:

1) Pass-through authentication on one LDAP directory:

LDAP Client ---simple BIND--> OpenLDAP ---sasl---> saslauthd ---simple BIND--> AD

2) PTA on several LDAP directories --- with meta backend

LDAP Client ---sasl --- saslauthd --- simple BIND --> OpenLDAP ----simple BIND--> AD

3) PTA on several LDAP directories --- with ldap backend

LDAP Client ---sasl --- saslauthd --- simple BIND --> OpenLDAP ----simple BIND--> AD


However, the scenario that I want to achieve is that the client connecting to OpenLDAP must also use saslauthd, because that is the only way svnserve ( Subversion ) can talk to an LDAP directory. Also, because I can only talk to AD2 using sasl bind and NOT simple bind, I also have to use saslauthd to talk to AD2.

So what I really want to achieve is, using ASCII art / fixed width fonts:

LDAP Client ( e.g. svnserve / testsaslauthd ) ---sasl ---> saslauthd -> OpenLDAPÂ
                                     Â|------- sasl ---> saslauthd ---SASL BIND--> AD1
                                     Â\------- sasl ---> saslauthd ---SASL BIND--> AD2

The user that needs to be authenticated from the LDAP client ( e.g. svnserve / testsaslauthd ) is on either AD1 or AD2.

From what I can summarise, I will actually need three ( 3 ) saslauthd processes, with different unix sockets, and with diference saslauthd.conf.

Is there a way for OpenLDAP to talk to another LDAP directory using SASL / DIGEST-MD5 without having to use saslauthd ?? So that, I only need one (1) saslauthd ( from svnserve to OpenLDAP ) ?