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ui: reject extended clipboard message if not activated

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The extended clipboard message protocol requires that the client
activate the extension by requesting a psuedo encoding. If this
is not done, then any extended clipboard messages from the client
should be considered invalid and the client dropped.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20240115095119.654271-1-berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2024-01-15 09:51:19 +00:00 committed by Marc-André Lureau
parent 3ff11e4dca
commit 4cba838896
1 changed files with 5 additions and 0 deletions
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5
ui/vnc.c
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@ -2445,6 +2445,11 @@ static int protocol_client_msg(VncState *vs, uint8_t *data, size_t len)
}
if (read_s32(data, 4) < 0) {
if (!vnc_has_feature(vs, VNC_FEATURE_CLIPBOARD_EXT)) {
error_report("vnc: extended clipboard message while disabled");
vnc_client_error(vs);
break;
}
if (dlen < 4) {
error_report("vnc: malformed payload (header less than 4 bytes)"
" in extended clipboard pseudo-encoding.");