r8302: import mini HEIMDAL into the tree

(This used to be commit 118be28a7aef233799956615a99d1a2a74dac175)

1 files changed, 209 insertions, 0 deletions

diff --git a/source4/heimdal/lib/gssapi/decapsulate.c b/source4/heimdal/lib/gssapi/decapsulate.c
new file mode 100644
index 0000000000..90e037f09b
--- /dev/null
+++ b/source4/heimdal/lib/gssapi/decapsulate.c
@@ -0,0 +1,209 @@
+/*
+ * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden). 
+ * 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. 
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors 
+ *    may be used to endorse or promote products derived from this software 
+ *    without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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. 
+ */
+
+#include "gssapi_locl.h"
+
+RCSID("$Id: decapsulate.c,v 1.12 2005/06/16 20:40:49 lha Exp $");
+
+/*
+ * return the length of the mechanism in token or -1
+ * (which implies that the token was bad - GSS_S_DEFECTIVE_TOKEN
+ */
+
+ssize_t
+gssapi_krb5_get_mech (const u_char *ptr,
+		      size_t total_len,
+		      const u_char **mech_ret)
+{
+    size_t len, len_len, mech_len, foo;
+    const u_char *p = ptr;
+    int e;
+
+    if (total_len < 1)
+	return -1;
+    if (*p++ != 0x60)
+	return -1;
+    e = der_get_length (p, total_len - 1, &len, &len_len);
+    if (e || 1 + len_len + len != total_len)
+	return -1;
+    p += len_len;
+    if (*p++ != 0x06)
+	return -1;
+    e = der_get_length (p, total_len - 1 - len_len - 1,
+			&mech_len, &foo);
+    if (e)
+	return -1;
+    p += foo;
+    *mech_ret = p;
+    return mech_len;
+}
+
+OM_uint32
+_gssapi_verify_mech_header(u_char **str,
+			   size_t total_len,
+			   gss_OID mech)
+{
+    const u_char *p;
+    ssize_t mech_len;
+
+    mech_len = gssapi_krb5_get_mech (*str, total_len, &p);
+    if (mech_len < 0)
+	return GSS_S_DEFECTIVE_TOKEN;
+
+    if (mech_len != mech->length)
+	return GSS_S_BAD_MECH;
+    if (memcmp(p,
+	       mech->elements,
+	       mech->length) != 0)
+	return GSS_S_BAD_MECH;
+    p += mech_len;
+    *str = rk_UNCONST(p);
+    return GSS_S_COMPLETE;
+}
+
+OM_uint32
+gssapi_krb5_verify_header(u_char **str,
+			  size_t total_len,
+			  const u_char *type,
+			  gss_OID oid)
+{
+    OM_uint32 ret;
+    size_t len;
+    u_char *p = *str;
+
+    ret = _gssapi_verify_mech_header(str, total_len, oid);
+    if (ret)
+	return ret;
+
+    len = total_len - (*str - p);
+
+    if (len < 2)
+	return GSS_S_DEFECTIVE_TOKEN;
+
+    if (memcmp (*str, type, 2) != 0)
+	return GSS_S_DEFECTIVE_TOKEN;
+    *str += 2;
+
+    return 0;
+}
+
+/*
+ * Remove the GSS-API wrapping from `in_token' giving `out_data.
+ * Does not copy data, so just free `in_token'.
+ */
+
+OM_uint32
+_gssapi_decapsulate(
+    OM_uint32 *minor_status,
+    gss_buffer_t input_token_buffer,
+    krb5_data *out_data,
+    const gss_OID mech
+)
+{
+    u_char *p;
+    OM_uint32 ret;
+
+    p = input_token_buffer->value;
+    ret = _gssapi_verify_mech_header(&p,
+				    input_token_buffer->length,
+				    mech);
+    if (ret) {
+	*minor_status = 0;
+	return ret;
+    }
+
+    out_data->length = input_token_buffer->length -
+	(p - (u_char *)input_token_buffer->value);
+    out_data->data   = p;
+    return GSS_S_COMPLETE;
+}
+
+/*
+ * Remove the GSS-API wrapping from `in_token' giving `out_data.
+ * Does not copy data, so just free `in_token'.
+ */
+
+OM_uint32
+gssapi_krb5_decapsulate(OM_uint32 *minor_status,    
+			gss_buffer_t input_token_buffer,
+			krb5_data *out_data,
+			const char *type,
+			gss_OID oid)
+{
+    u_char *p;
+    OM_uint32 ret;
+
+    p = input_token_buffer->value;
+    ret = gssapi_krb5_verify_header(&p,
+				    input_token_buffer->length,
+				    type,
+				    oid);
+    if (ret) {
+	*minor_status = 0;
+	return ret;
+    }
+
+    out_data->length = input_token_buffer->length -
+	(p - (u_char *)input_token_buffer->value);
+    out_data->data   = p;
+    return GSS_S_COMPLETE;
+}
+
+/*
+ * Verify padding of a gss wrapped message and return its length.
+ */
+
+OM_uint32
+_gssapi_verify_pad(gss_buffer_t wrapped_token, 
+		   size_t datalen,
+		   size_t *padlen)
+{
+    u_char *pad;
+    size_t padlength;
+    int i;
+
+    pad = (u_char *)wrapped_token->value + wrapped_token->length - 1;
+    padlength = *pad;
+
+    if (padlength > datalen)
+	return GSS_S_BAD_MECH;
+
+    for (i = padlength; i > 0 && *pad == padlength; i--, pad--)
+	;
+    if (i != 0)
+	return GSS_S_BAD_MIC;
+
+    *padlen = padlength;
+
+    return 0;
+}