HP UX Red Hat Direry Server Software manual Defining Access from a Specific IP Address

Chapter 6. Managing Access Control

hole, and the server's normal behavior is modified to avoid it.

Consider the following example:

aci: (target="ldap:///dc=example,dc=com")(targetattr=*) (version 3.0;

acl "manager-write"; allow (all) userattr = "manager#USERDN";)

This ACI grants managers all rights on the entries of employees that report to them. However, because access rights are evaluated on the entry being created, this type of ACI would also allow any employee to create an entry in which the manager attribute is set to their own DN. For example, disgruntled employee Joe (cn=Joe,ou=eng,dc=example,dc=com) might want to create an entry in the Human Resources branch of the tree to use (or misuse) the privileges granted to Human Resources employees.

He could do this by creating the following entry:

dn: cn= Trojan Horse,ou=Human Resources,dc=example,dc=com

objectclass: top

...

cn: Trojan Horse

manager: cn=Joe,ou=eng,dc=example,dc=com

To avoid this type of security threat, the ACI evaluation process does not grant add permission at level 0, to the entry itself. You can, however, use the parent keyword to grant add rights below existing entries. You must specify the number of levels below the parent for add rights. For example, the following ACI allows child entries to be added to any entry in the dc=example,dc=com that has a manager attribute that matches the bind DN:

aci: (target="ldap:///dc=example,dc=com")(targetattr=*) (version 3.0; acl "parent-access"; allow (add) userattr = "parent[0,1].manager#USERDN";)

This ACI ensures that add permission is granted only to users whose bind DN matches the manager attribute of the parent entry.

4.6. Defining Access from a Specific IP Address

Using bind rules, you can indicate that the bind operation must originate from a specific IP address. This is often used to force all directory updates to occur from a given machine or network domain.

The LDIF syntax for setting a bind rule based on an IP address is as follows:

ip = "IP_address" or ip != "IP_address"

The IP address must be expressed in dot notation. You can use the wildcard character (*) to include multiple machines. For example, the following string is valid:

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