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54 lines
1.5 KiB
54 lines
1.5 KiB
package 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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"gosrc.io/xmpp/stanza"
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)
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func authSASL(socket io.ReadWriter, decoder *xml.Decoder, f stanza.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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err := fmt.Errorf("PLAIN authentication is not supported by server: %v", f.Mechanisms.Mechanism)
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return NewConnError(err, true)
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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>", stanza.NSSASL, enc)
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// Next message should be either success or failure.
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val, err := stanza.NextPacket(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 stanza.SASLSuccess:
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case stanza.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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err := errors.New("auth failure: " + v.Any.Local)
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return NewConnError(err, true)
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default:
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return errors.New("expected SASL success or failure, got " + v.Name())
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}
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return err
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}
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