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88 lines
2.5 KiB
88 lines
2.5 KiB
package xmpp // import "fluux.io/xmpp"
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import (
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"encoding/base64"
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"encoding/xml"
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"errors"
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"fmt"
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"io"
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)
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func authSASL(socket io.ReadWriter, decoder *xml.Decoder, f streamFeatures, user string, password string) (err error) {
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// TODO: Implement other type of SASL Authentication
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havePlain := false
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for _, m := range f.Mechanisms.Mechanism {
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if m == "PLAIN" {
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havePlain = true
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break
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}
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}
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if !havePlain {
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return fmt.Errorf("PLAIN authentication is not supported by server: %v", f.Mechanisms.Mechanism)
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}
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return authPlain(socket, decoder, user, password)
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}
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// Plain authentication: send base64-encoded \x00 user \x00 password
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func authPlain(socket io.ReadWriter, decoder *xml.Decoder, user string, password string) error {
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raw := "\x00" + user + "\x00" + password
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enc := make([]byte, base64.StdEncoding.EncodedLen(len(raw)))
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base64.StdEncoding.Encode(enc, []byte(raw))
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fmt.Fprintf(socket, "<auth xmlns='%s' mechanism='PLAIN'>%s</auth>", nsSASL, enc)
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// Next message should be either success or failure.
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name, val, err := next(decoder)
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if err != nil {
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return err
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}
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switch v := val.(type) {
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case *saslSuccess:
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case *saslFailure:
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// v.Any is type of sub-element in failure, which gives a description of what failed.
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return errors.New("auth failure: " + v.Any.Local)
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default:
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return errors.New("expected success or failure, got " + name.Local + " in " + name.Space)
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}
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return err
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}
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// XMPP Packet Parsing
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type saslMechanisms struct {
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XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-sasl mechanisms"`
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Mechanism []string `xml:"mechanism"`
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}
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type saslSuccess struct {
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XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-sasl success"`
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}
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type saslFailure struct {
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XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-sasl failure"`
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Any xml.Name // error reason is a subelement
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}
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type auth struct {
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XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-sasl auth"`
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Mechanism string `xml:"mecanism,attr"`
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Value string `xml:",innerxml"`
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}
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type bindBind struct {
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XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-bind bind"`
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Resource string `xml:"resource,omitempty"`
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Jid string `xml:"jid,omitempty"`
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}
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func (*bindBind) IsIQPayload() {
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}
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// Session is obsolete in RFC 6121.
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// Added for compliance with RFC 3121.
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// Remove when ejabberd purely conforms to RFC 6121.
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type sessionSession struct {
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XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-session session"`
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optional xml.Name // If it does exist, it mean we are not required to open session
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}
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