10:12 a.m.
I have encountered an effect that I believe is a bug, but I might be wrong.
It would be nice if someone could confirm that my acls should be working, or in case they
should not, give me a hint what I am doing
wrong.
Here is what I am trying to archive:
* there is one ldap provider (master) server that contains all attributes that are
relevant for my organisation
* on the master there is a user allowing a highly secured consumer(slave) ldap server the
replication of all attributes from the
master
* on the master there is a user allowing a low-security consumer(slave) ldap server the
replication of all attributes from the
master except some critical ones
* on the master there is a user (cn=provisioninguser) that can read the accesslog. it is
used by scripts to e.g. notify non-ldap
systems of password changes.
I would like to put the acls for the replication users (high and low security ldap slaves)
on the databases and not the frontend to
avoid accidental modifications. All other acls should be on the frontend.
If I configure all my acls on the frontend only everything works as I think it should. If
some acls are on the database the results
are rather weird (
the cn=provisioninguser can see only one value of the multi-valued reqMod attribte)
The following acl snippet only deals with accesslog access which is where I encounter the
problem:
dn: olcDatabase={2}hdb,cn=config
olcAccess: {0}to dn.subtree="cn=accesslog"
attrs=reqMod val.regex="^topSecretAttribute:.*"
by dn.base="cn=replicationuser,dc=organisation,dc=com" read
by dn.base="cn=replication_low_security,dc=organisation,dc=com" none
by * break
dn: olcDatabase={2}hdb,cn=config
olcAccess: {1}to dn.subtree="cn=accesslog"
by dn.base="cn=replicationuser,dc=organisation,dc=com" read
by dn.base="cn=replication_low_security,dc=organisation,dc=com" read
by * break
dn: olcDatabase={-1}frontend,cn=config
olcAccess: {0}to dn.subtree="cn=accesslog"
by dn.base="cn=provisioninguser,dc=organisation,dc=com" read
by * none
*if the acls 1,2 and 3 are on "olcDatabase={-1}frontend,cn=config" (which they
are not in the example above)
cn=provisioninguser,dc=organisation,dc=com can read all values from the multi-valued
attribute reqMod (which is what I want).
ldapsearch -D cn=provisioninguser,dc=organisation,dc=com -w 123 -b
cn=accesslog reqDN=cn=user1,dc=organisation,dc=com reqMod
dn:
reqStart=20131227145130.000001Z,cn=accesslog
reqMod: userPassword:= {SSHA}bmyaw8Xy1UftlTorPDQE9yLzruoxDnGq
reqMod: topSecretAttribute:= topsecret
reqMod: pwdChangedTime:= 20131227145130Z
reqMod: entryCSN:= 20131227145130.917649Z#000000#000#000000
reqMod: modifiersName:= cn=admin
reqMod: modifyTimestamp:= 20131227145130Z
*if the acls 1 and 2 are on "olcDatabase={2}hdb,cn=config" and the 3rd one is on
"olcDatabase={-1}frontend,cn=config"
cn=provisioninguser,dc=organisation,dc=com can read only one value from the multi-valued
attribute reqMod (why?).
ldapsearch -D cn=provisioninguser,dc=organisation,dc=com -w 123 -b
cn=accesslog reqDN=cn=user1,dc=organisation,dc=com reqMod
dn:
reqStart=20131227145130.000001Z,cn=accesslog
reqMod: userPassword:= {SSHA}bmyaw8Xy1UftlTorPDQE9yLzruoxDnGq
Best regards,
Marvin Mundry
University of Hamburg
Regional Computer Center (RRZ)
Division Zentrale Dienste
Schlueterstrasse 70
20146 Hamburg
+49 (0)40 42838-9109
12:36 a.m.
Am Fri, 27 Dec 2013 18:12:20 +0000
schrieb "Mundry, Marvin" <Marvin.Mundry(a)uni-hamburg.de>:
I have encountered an effect that I believe is a bug, but I might be
wrong. It would be nice if someone could confirm that my acls should
be working, or in case they should not, give me a hint what I am
doing wrong.
Here is what I am trying to archive:
* there is one ldap provider (master) server that contains all
attributes that are relevant for my organisation
* on the master there is a user allowing a highly secured
consumer(slave) ldap server the replication of all attributes from
the master
* on the master there is a user allowing a low-security
consumer(slave) ldap server the replication of all attributes from
the master except some critical ones
* on the master there is a user (cn=provisioninguser) that can read
the accesslog. it is used by scripts to e.g. notify non-ldap systems
of password changes.
I would like to put the acls for the replication users (high and low
security ldap slaves) on the databases and not the frontend to avoid
accidental modifications. All other acls should be on the frontend.
If I configure all my acls on the frontend only everything works as I
think it should. If some acls are on the database the results are
rather weird ( the cn=provisioninguser can see only one value of the
multi-valued reqMod attribte)
The following acl snippet only deals with accesslog access which is
where I encounter the problem:
dn: olcDatabase={2}hdb,cn=config
olcAccess: {0}to dn.subtree="cn=accesslog"
attrs=reqMod val.regex="^topSecretAttribute:.*"
by dn.base="cn=replicationuser,dc=organisation,dc=com" read
by dn.base="cn=replication_low_security,dc=organisation,dc=com" none
by * break
the break rule will be ignored, as 'none' is the implicit last rule.
[...]
run slapd with -dacl
-Dieter
--
http://sys4.de
2:52 a.m.
On 2013-12-28 09:36, Dieter Klünter wrote:
> [...]
> by dn.base="cn=replication_low_security,dc=organisation,dc=com" none
> by * break
the break rule will be ignored, as 'none' is the implicit last rule.
No, "none" does not imply "this is the last rule". OTOH there
is an implicit last "by * none", hidden by the "by * break".
[...]
run slapd with -dacl
Indeed.
--
Hallvard
1:03 a.m.
> by
dn.base="cn=replication_low_security,dc=organisation,dc=com" none
> by * break
>
> the break rule will be ignored, as 'none' is the implicit last rule.
No, "none" does not imply "this is the last rule". OTOH there is an
implicit last "by *
none", hidden by the "by * break".
to me it seems that if a "by * break" appears
* in the database acls, in my case slapd does not continue looking for global access
directives in the frontend.
* in the frontend acls, slapd continues evaluating statements from the global access
directives
http://www.openldap.org/doc/admin24/access-control.html
states "For each entry, access controls provided in the database which holds the
entry [...] apply first, followed by the global
access directives"
so my understanding is that what I am observing should not happen
> run slapd with -dacl
the interesting line here should be
"52c12415 => slap_access_allowed: no more rules" (although there are more in
the frontend)
dn: ACCESSLOG_DB
olcAccess: {0}to dn.subtree="cn=accesslog"
attrs=reqMod val.regex="^topSecretAttribute:.*"
by dn.base="cn=replicationuser,dc=organisation,dc=com" read
by dn.base="cn=replication_low_security,dc=organisation,dc=com" none
by * break
dn: ACCESSLOG_DB
olcAccess: {1}to dn.subtree="cn=accesslog"
by dn.base="cn=replicationuser,dc=organisation,dc=com" read
by dn.base="cn=replication_low_security,dc=organisation,dc=com" read
by * break
dn: FRONTEND
olcAccess: {0}to dn.subtree="cn=accesslog"
by dn.base="cn=provisioninguser,dc=organisation,dc=com" read
by * none
52c12415 => access_allowed: read access to
"reqStart=20131227145130.000001Z,cn=accesslog" "reqMod" requested
52c12415 => dn: [1] cn=accesslog
52c12415 => acl_get: [1] matched
52c12415 acl_get: valpat ^topSecretAttribute:.*
52c12415 => dn: [2] cn=accesslog
52c12415 => acl_get: [2] matched
52c12415 => acl_get: [2] attr reqMod
52c12415 => acl_mask: access to entry
"reqStart=20131227145130.000001Z,cn=accesslog", attr "reqMod"
requested
52c12415 => acl_mask: to value by
"cn=provisioninguser,dc=organisation,dc=com", (=0)
52c12415 <= check a_dn_pat: cn=replicationuser,dc=organisation,dc=com
52c12415 <= check a_dn_pat: cn=replication_public_user,dc=organisation,dc=com
52c12415 <= check a_dn_pat: *
52c12415 <= acl_mask: [3] applying +0 (break)
52c12415 <= acl_mask: [3] mask: =0
52c12415 <= acl_get: done.
52c12415 => slap_access_allowed: no more rules
52c12415 => access_allowed: no more rules
52c12415 send_search_entry: conn 1002 access to attribute reqMod, value #6 not allowed
###############################################################################
dn: FRONTEND
olcAccess: {0}to dn.subtree="cn=accesslog"
attrs=reqMod val.regex="^topSecretAttribute:.*"
by dn.base="cn=replicationuser,dc=organisation,dc=com" read
by dn.base="cn=replication_low_security,dc=organisation,dc=com" none
by * break
dn: FRONTEND
olcAccess: {1}to dn.subtree="cn=accesslog"
by dn.base="cn=replicationuser,dc=organisation,dc=com" read
by dn.base="cn=replication_low_security,dc=organisation,dc=com" read
by * break
dn: FRONTEND
olcAccess: {0}to dn.subtree="cn=accesslog"
by dn.base="cn=provisioninguser,dc=organisation,dc=com" read
by * none
52c12bbf => access_allowed: read access to
"reqStart=20131227145130.000001Z,cn=accesslog" "reqMod" requested
52c12bbf => dn: [24] cn=accesslog
52c12bbf => acl_get: [24] matched
52c12bbf acl_get: valpat ^topSecretAttribute:.*
52c12bbf => dn: [25] cn=accesslog
52c12bbf => acl_get: [25] matched
52c12bbf => acl_get: [25] attr reqMod
52c12bbf => acl_mask: access to entry
"reqStart=20131227145130.000001Z,cn=accesslog", attr "reqMod"
requested
52c12bbf => acl_mask: to value by
"cn=provisioninguser,dc=organisation,dc=com", (=0)
52c12bbf <= check a_dn_pat: cn=replicationuser,dc=organisation,dc=com
52c12bbf <= check a_dn_pat: cn=replication_public_user,dc=organisation,dc=com
52c12bbf <= check a_dn_pat: *
52c12bbf <= acl_mask: [3] applying +0 (break)
52c12bbf <= acl_mask: [3] mask: =0
52c12bbf => dn: [26] cn=accesslog
52c12bbf => acl_get: [26] matched
52c12bbf => acl_get: [26] attr reqMod
52c12bbf => acl_mask: access to entry
"reqStart=20131227145130.000001Z,cn=accesslog", attr "reqMod"
requested
52c12bbf => acl_mask: to value by
"cn=provisioninguser,dc=organisation,dc=com", (=0)
52c12bbf <= check a_dn_pat: cn=provisioninguser,dc=organisation,dc=com
52c12bbf <= acl_mask: [1] applying read(=rscxd) (stop)
52c12bbf <= acl_mask: [1] mask: read(=rscxd)
52c12bbf => slap_access_allowed: read access granted by read(=rscxd)
52c12bbf => access_allowed: read access granted by read(=rscxd)
3621
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3624
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openldap-technical@openldap.org
3 comments
3 participants
participants (3)
-
Dieter Klünter -
Hallvard Breien Furuseth -
Mundry, Marvin