policydproxy

package module

v0.0.0-...-5c8867b Latest Latest Go to latest Published: Aug 18, 2023 License: GPL-3.0 Imports: 11 Imported by: 0

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A proxy for TCP-based Postfix policy services, that knows where to route the actual request based on the result of an LDAP query for the recipient.

The reason for the existence of this tool is that we don't know how to tell Postfix to combine a LDAP map as the check_policy_service backend.

The proxying behavior is controlled by a configuration file, in YAML format, which supports the following attributes:

not_found_action - (default: DUNNO) action to return to Postfix when the user is not found in the database
ldap
- uri - connection string
- bind_dn - bind DN, for authentication
- bind_pw - bind password
- base_dn - base DN for the lookup query
- filter - filter for the lookup query
- attr - result attribute for the lookup query
- result_fmt - result format string to obtain the upstream host:port address, where the literal token %s is replaced by the value of the attr attribute

The LDAP parameters are pretty much all mandatory.

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type Director interface {
	Lookup(context.Context, string) (string, error)
}

A Director provides us with an upstream address (in host:port form), given a recipient email address.

func NewLDAPDirector(uri, bindDN, bindPW, baseDN, filter, attr, resultFmt string) (Director, error)

type Proxy struct {
	// contains filtered or unexported fields
}

Proxy implements the policyd-proxy service as a go-common/unix Handler. It understands the Postfix policy service protocol as documented on http://www.postfix.org/SMTPD_POLICY_README.html.

func NewProxy(director Director, notFoundAction string) *Proxy

NewProxy creates a new Proxy with the specified Director.

func (s *Proxy) ServeConnection(c net.Conn)

ServeConnection implements the Handler interface.

Path	Synopsis
cmd
policyd-proxy