1 files changed, 131 insertions, 0 deletions
diff --git a/lib/libgssapi/gss_encapsulate_token.c b/lib/libgssapi/gss_encapsulate_token.c
new file mode 100644
index 0000000..ed0e217
--- /dev/null
+++ b/lib/libgssapi/gss_encapsulate_token.c
@@ -0,0 +1,131 @@
+/*-
+ * Copyright (c) 2008 Doug Rabson
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <gssapi/gssapi.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "utils.h"
+
+OM_uint32
+gss_encapsulate_token(const gss_buffer_t input_token, gss_OID oid,
+    gss_buffer_t output_token)
+{
+	unsigned char *p;
+	size_t len, inside_len;
+	size_t a, b;
+	int i;
+
+	_gss_buffer_zero(output_token);
+
+	/*
+	 * First time around, we calculate the size, second time, we
+	 * encode the token.
+	 */
+	p = 0;
+	for (i = 0; i < 2; i++) {
+		len = 0;
+
+		/*
+		 * Token starts with [APPLICATION 0] SEQUENCE.
+		 */
+		if (p)
+			*p++ = 0x60;
+		len++;
+
+		/*
+		 * The length embedded in the token is the space
+		 * needed for the encapsulated oid plus the length of
+		 * the inner token.
+		 */
+		if (oid->length > 127)
+			return (GSS_S_DEFECTIVE_TOKEN);
+
+		inside_len = 2 + oid->length + input_token->length;
+
+		/*
+		 * Figure out how to encode the length
+		 */
+		if (inside_len < 128) {
+			if (p)
+				*p++ = inside_len;
+			len++;
+		} else {
+			b = 1;
+			if (inside_len >= 0x100)
+				b++;
+			if (inside_len >= 0x10000)
+				b++;
+			if (inside_len >= 0x1000000)
+				b++;
+			if (p)
+				*p++ = b | 0x80;
+			len++;
+			a = inside_len << 8*(4 - b);
+			while (b) {
+				if (p)
+					*p++ = (a >> 24);
+				a <<= 8;
+				len++;
+				b--;
+			}
+		}
+
+		/*
+		 * Encode the OID for the mechanism. Simplify life by
+		 * assuming that the OID length is less than 128 bytes.
+		 */
+		if (p)
+			*p++ = 0x06;
+		len++;
+		if (p)
+			*p++ = oid->length;
+		len++;
+		if (p) {
+			memcpy(p, oid->elements, oid->length);
+			p += oid->length;
+		}
+		len += oid->length;
+
+		if (p) {
+			memcpy(p, input_token->value, input_token->length);
+			p += input_token->length;
+		}
+		len += input_token->length;
+
+		if (i == 0) {
+			output_token->length = len;
+			output_token->value = malloc(len);
+			if (!output_token->value)
+				return (GSS_S_DEFECTIVE_TOKEN);
+			p = output_token->value;
+		}
+	}
+
+	return (GSS_S_COMPLETE);
+}