static Bool
PerformAuthenticationTight(void)
{
rfbAuthenticationCapsMsg caps;
CARD32 authScheme;
int i;
/* In the protocol version 3.7t, the server informs us about supported
authentication schemes. Here we read this information. */
if (!ReadFromRFBServer((char *)&caps, sz_rfbAuthenticationCapsMsg))
return False;
caps.nAuthTypes = Swap32IfLE(caps.nAuthTypes);
if (!caps.nAuthTypes) {
fprintf(stderr, "No authentication needed\n");
return True;
}
if (!ReadCapabilityList(authCaps, caps.nAuthTypes))
return False;
/* Prefer Unix login authentication if a user name was given. */
if (appData.userLogin && CapsIsEnabled(authCaps, rfbAuthUnixLogin)) {
authScheme = Swap32IfLE(rfbAuthUnixLogin);
if (!WriteExact(rfbsock, (char *)&authScheme, sizeof(authScheme)))
return False;
return AuthenticateUnixLogin();
}
/* Otherwise, try server's preferred authentication scheme. */
for (i = 0; i < CapsNumEnabled(authCaps); i++) {
authScheme = CapsGetByOrder(authCaps, i);
if (authScheme != rfbAuthUnixLogin && authScheme != rfbAuthVNC)
continue; /* unknown scheme - cannot use it */
authScheme = Swap32IfLE(authScheme);
if (!WriteExact(rfbsock, (char *)&authScheme, sizeof(authScheme)))
return False;
authScheme = Swap32IfLE(authScheme); /* convert it back */
if (authScheme == rfbAuthUnixLogin) {
return AuthenticateUnixLogin();
} else if (authScheme == rfbAuthVNC) {
return AuthenticateVNC();
} else {
/* Should never happen. */
fprintf(stderr, "Assertion failed: unknown authentication scheme\n");
return False;
}
}
fprintf(stderr, "No suitable authentication schemes offered by server\n");
return False;
}
static Bool
PerformAuthenticationTight(void)
{
rfbAuthenticationCapsMsg caps;
CARD32 authScheme;
int i;
/* In protocols 3.7t/3.8t, the server informs us about supported
authentication schemes. Here we read this information. */
if (!ReadFromRFBServer((char *)&caps, sz_rfbAuthenticationCapsMsg))
return False;
caps.nAuthTypes = Swap32IfLE(caps.nAuthTypes);
/* Special case - empty capability list stands for no authentication. */
if (!caps.nAuthTypes)
return AuthenticateNone();
if (!ReadCapabilityList(authCaps, caps.nAuthTypes))
return False;
/* Try server's preferred authentication scheme. */
for (i = 0; i < CapsNumEnabled(authCaps); i++) {
authScheme = CapsGetByOrder(authCaps, i);
if (authScheme != rfbAuthVNC && authScheme != rfbAuthNone)
continue; /* unknown scheme - cannot use it */
authScheme = Swap32IfLE(authScheme);
if (!WriteExact(rfbsock, (char *)&authScheme, sizeof(authScheme)))
return False;
authScheme = Swap32IfLE(authScheme); /* convert it back */
switch (authScheme) {
case rfbAuthNone:
return AuthenticateNone();
case rfbAuthVNC:
return AuthenticateVNC();
default: /* should never happen */
fprintf(stderr, "Internal error: Invalid authentication type\n");
return False;
}
}
fprintf(stderr, "No suitable authentication schemes offered by server\n");
return False;
}
