Wallet::ACL::LDAP::Attribute

(Wallet ACL verifier for LDAP attribute compares)

SYNOPSIS

    my $verifier = Wallet::ACL::LDAP::Attribute->new;
    my $status = $verifier->check ($principal, "$attr=$value");
    if (not defined $status) {
        die "Something failed: ", $verifier->error, "\n";
    } elsif ($status) {
        print "Access granted\n";
    } else {
        print "Access denied\n";
    }

DESCRIPTION

Wallet::ACL::LDAP::Attribute checks whether the LDAP record for the entry corresponding to a principal contains an attribute with a particular value. It is used to verify ACL lines of type ldap-attr. The value of such an ACL is an attribute followed by an equal sign and a value, and the ACL grants access to a given principal if and only if the LDAP entry for that principal has that attribute set to that value.

To use this object, several configuration parameters must be set. See Wallet::Config for details on those configuration parameters and information about how to set wallet configuration.

METHODS

new()

Creates a new ACL verifier. Opens and binds the connection to the LDAP server.

check(PRINCIPAL, ACL)

Returns true if PRINCIPAL is granted access according to ACL, false if not, and undef on an error (see DIAGNOSTICS below). ACL must be an attribute name and a value, separated by an equal sign (with no whitespace). PRINCIPAL will be granted access if its LDAP entry contains that attribute with that value.

error()

Returns the error if check() returned undef.

DIAGNOSTICS

The new() method may fail with one of the following exceptions:

LDAP attribute ACL support not available: %s

Attempting to connect or bind to the LDAP server failed.

LDAP attribute ACL support not configured

The required configuration parameters were not set. See Wallet::Config(3) for the required configuration parameters and how to set them.

Verifying an LDAP attribute ACL may fail with the following errors (returned by the error() method):

cannot check LDAP attribute %s for %s: %s

The LDAP compare to check for the required attribute failed. The attribute may have been misspelled, or there may be LDAP directory permission issues. This error indicates that PRINCIPAL's entry was located in LDAP, but the check failed during the compare to verify the attribute value.

cannot search for %s in LDAP: %s

Searching for PRINCIPAL (possibly after ldap_map_principal() mapping) failed. This is often due to LDAP directory permissions issues. This indicates a failure during the mapping of PRINCIPAL to an LDAP DN.

malformed ldap-attr ACL

The ACL parameter to check() was malformed. Usually this means that either the attribute or the value were empty or the required = sign separating them was missing.

mapping principal to LDAP failed: %s

There was an ldap_map_principal() function defined in the wallet configuration, but calling it for the PRINCIPAL argument failed.

no principal specified

The PRINCIPAL parameter to check() was undefined or the empty string.

SEE ALSO

Wallet::ACL(3), Wallet::ACL::Base(3), Wallet::Config(3), wallet-backend(8)

This module is part of the wallet system. The current version is available from <http://www.eyrie.org/~eagle/software/wallet/>.

AUTHOR

Russ Allbery <eagle@eyrie.org>

Last modified and spun 2016-01-24