Function pg_SSPI_continue

src/interfaces/libpq/fe-auth.c:215–340

* Continue SSPI authentication with next token as needed. */

 * Continue SSPI authentication with next token as needed.
 */
static int
pg_SSPI_continue(PGconn *conn, int payloadlen)
{
	SECURITY_STATUS r;
	CtxtHandle	newContext;
	ULONG		contextAttr;
	SecBufferDesc inbuf;
	SecBufferDesc outbuf;
	SecBuffer	OutBuffers[1];
	SecBuffer	InBuffers[1];
	char	   *inputbuf = NULL;

	if (conn->sspictx != NULL)
	{
		/*
		 * On runs other than the first we have some data to send. Put this
		 * data in a SecBuffer type structure.
		 */
		inputbuf = malloc(payloadlen);
		if (!inputbuf)
		{
			appendPQExpBuffer(&conn->errorMessage,
							  libpq_gettext("out of memory allocating SSPI buffer (%d)\n"),
							  payloadlen);
			return STATUS_ERROR;
		}
		if (pqGetnchar(inputbuf, payloadlen, conn))
		{
			/*
			 * Shouldn't happen, because the caller should've ensured that the
			 * whole message is already in the input buffer.
			 */
			free(inputbuf);
			return STATUS_ERROR;
		}

		inbuf.ulVersion = SECBUFFER_VERSION;
		inbuf.cBuffers = 1;
		inbuf.pBuffers = InBuffers;
		InBuffers[0].pvBuffer = inputbuf;
		InBuffers[0].cbBuffer = payloadlen;
		InBuffers[0].BufferType = SECBUFFER_TOKEN;
	}

	OutBuffers[0].pvBuffer = NULL;
	OutBuffers[0].BufferType = SECBUFFER_TOKEN;
	OutBuffers[0].cbBuffer = 0;
	outbuf.cBuffers = 1;
	outbuf.pBuffers = OutBuffers;
	outbuf.ulVersion = SECBUFFER_VERSION;

	r = InitializeSecurityContext(conn->sspicred,
								  conn->sspictx,
								  conn->sspitarget,
								  ISC_REQ_ALLOCATE_MEMORY,
								  0,
								  SECURITY_NETWORK_DREP,
								  (conn->sspictx == NULL) ? NULL : &inbuf,