Re: [Qemu-devel] [PATCH v3 10/10] ui: convert VNC to use generic cipher API

["Daniel P. Berrange" <berrange@redhat.com>]

On Tue, Jun 23, 2015 at 10:26:50AM +0800, Gonglei wrote:
> On 2015/6/19 1:02, Daniel P. Berrange wrote:
> >      if (!vs->vd->password) {
> >          VNC_DEBUG("No password configured on server");
> > @@ -2534,9 +2536,29 @@ static int protocol_client_auth_vnc(VncState *vs, uint8_t *data, size_t len)
> >      pwlen = strlen(vs->vd->password);
> >      for (i=0; i<sizeof(key); i++)
> >          key[i] = i<pwlen ? vs->vd->password[i] : 0;
> > -    deskey(key, EN0);
> > -    for (j = 0; j < VNC_AUTH_CHALLENGE_SIZE; j += 8)
> > -        des(response+j, response+j);
> > +
> > +    cipher = qcrypto_cipher_new(
> > +        QCRYPTO_CIPHER_ALG_DES_RFB,
> > +        QCRYPTO_CIPHER_MODE_ECB,
> > +        key, G_N_ELEMENTS(key),
> > +        &err);
> > +    if (!cipher) {
> > +        VNC_DEBUG("Cannot initialize cipher %s",
> > +                  error_get_pretty(err));
> > +        error_free(err);
> > +        goto reject;
> > +    }
> > +
> > +    if (qcrypto_cipher_decrypt(cipher,
> > +                               vs->challenge,
> > +                               response,
> > +                               VNC_AUTH_CHALLENGE_SIZE,
> > +                               &err) < 0) {
> > +        VNC_DEBUG("Cannot encrypt challenge %s",
> > +                  error_get_pretty(err));
> > +        error_free(err);
> > +        goto reject;
> > +    }
> 
> Do we need change above VNC_DEBUGs to error_report() or something like that?

In general, yes, the VNC code doesn't really handle error reporting very
well today.

> Anyway, it doesn't influence my R-b:
> 	Reviewed-by: Gonglei <arei.gonglei@huawei.com>

Regards,
Daniel
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