Move get and verify mic to the same file since they share code,

implement NTLM v1 and dummy signatures.


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@19439 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/gssapi/ntlm/crypto.c

@@ -0,0 +1,193 @@
+/*
+ * Copyright (c) 2006 Kungliga Tekniska H<>gskolan
+ * (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 "ntlm/ntlm.h"
+
+RCSID("$Id$");
+
+static void
+encode_le_uint32(uint32_t n, unsigned char *p)
+{
+  p[0] = (n >> 0)  & 0xFF;
+  p[1] = (n >> 8)  & 0xFF;
+  p[2] = (n >> 16) & 0xFF;
+  p[3] = (n >> 24) & 0xFF;
+}
+
+
+static void
+decode_le_uint32(const void *ptr, uint32_t *n)
+{
+    const unsigned char *p = ptr;
+    *n = (p[0] << 0) | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
+}
+
+
+uint32_t
+_krb5_crc_update (const char *p, size_t len, uint32_t res);
+void
+_krb5_crc_init_table(void);
+
+
+OM_uint32 _gss_ntlm_get_mic
+           (OM_uint32 * minor_status,
+            const gss_ctx_id_t context_handle,
+            gss_qop_t qop_req,
+            const gss_buffer_t message_buffer,
+            gss_buffer_t message_token
+           )
+{
+    ntlm_ctx ctx = (ntlm_ctx)context_handle;
+    OM_uint32 junk;
+
+    if (minor_status)
+	*minor_status = 0;
+    if (message_token) {
+	message_token->length = 0;
+	message_token->value = NULL;
+    }
+
+    message_token->value = malloc(16);
+    message_token->length = 16;
+    if (message_token->value == NULL) {
+	*minor_status = ENOMEM;
+	return GSS_S_FAILURE;
+    }
+
+    if(ctx->flags & NTLM_NEG_SIGN) {
+	unsigned char sigature[12];
+	uint32_t crc;
+
+	if ((ctx->status & STATUS_SESSIONKEY) == 0) {
+	    gss_release_buffer(&junk, message_token);
+	    return GSS_S_UNAVAILABLE;
+	}
+
+	_krb5_crc_init_table();
+	crc = _krb5_crc_update(message_buffer->value, 
+			       message_buffer->length, 0);
+	encode_le_uint32(0, &sigature[0]);
+	encode_le_uint32(crc, &sigature[4]);
+	encode_le_uint32(ctx->crypto.send_seq, &sigature[8]);
+
+	ctx->crypto.send_seq++;
+
+	encode_le_uint32(1, message_token->value); /* version */
+	RC4(&ctx->crypto.key, sizeof(sigature),
+	    sigature, ((unsigned char *)message_token->value) + 4);
+
+        return GSS_S_COMPLETE;
+    } else if (ctx->flags & NTLM_NEG_ALWAYS_SIGN) {
+	unsigned char *sigature;
+
+	sigature = message_token->value;
+
+	encode_le_uint32(1, &sigature[0]); /* version */
+	encode_le_uint32(0, &sigature[4]);
+	encode_le_uint32(0, &sigature[8]);
+	encode_le_uint32(0, &sigature[12]);
+
+        return GSS_S_COMPLETE;
+    }
+
+    return GSS_S_UNAVAILABLE;
+}
+
+
+OM_uint32
+_gss_ntlm_verify_mic
+           (OM_uint32 * minor_status,
+            const gss_ctx_id_t context_handle,
+            const gss_buffer_t message_buffer,
+            const gss_buffer_t token_buffer,
+            gss_qop_t * qop_state
+	    )
+{
+    ntlm_ctx ctx = (ntlm_ctx)context_handle;
+
+    if (qop_state != NULL)
+	*qop_state = GSS_C_QOP_DEFAULT;
+    *minor_status = 0;
+
+    if (token_buffer->length != 16)
+	return GSS_S_BAD_MIC;
+
+    if(ctx->flags & NTLM_NEG_SIGN) {
+	unsigned char sigature[12];
+	uint32_t crc, num;
+
+	if ((ctx->status & STATUS_SESSIONKEY) == 0)
+	    return GSS_S_UNAVAILABLE;
+
+	decode_le_uint32(token_buffer->value, &num);
+	if (num != 1)
+	    return GSS_S_BAD_MIC;
+
+	RC4(&ctx->crypto.key, sizeof(sigature),
+	    ((unsigned char *)token_buffer->value) + 4, sigature);
+
+	_krb5_crc_init_table();
+	crc = _krb5_crc_update(message_buffer->value, 
+			       message_buffer->length, 0);
+	decode_le_uint32(&sigature[0], &num);
+	if (num != 0)
+	    return GSS_S_BAD_MIC;
+	decode_le_uint32(&sigature[4], &num);
+	if (num != crc)
+	    return GSS_S_BAD_MIC;
+	decode_le_uint32(&sigature[8], &num);
+	if (ctx->crypto.recv_seq != num)
+	    return GSS_S_BAD_MIC;
+	ctx->crypto.recv_seq++;
+
+        return GSS_S_COMPLETE;
+    } else if (ctx->flags & NTLM_NEG_ALWAYS_SIGN) {
+	uint32_t num;
+	unsigned char *p;
+
+	p = (unsigned char*)(token_buffer->value);
+
+	decode_le_uint32(&p[0], &num); /* version */
+	if (num != 1) return GSS_S_BAD_MIC;
+	decode_le_uint32(&p[4], &num);
+	if (num != 0) return GSS_S_BAD_MIC;
+	decode_le_uint32(&p[8], &num);
+	if (num != 0) return GSS_S_BAD_MIC;
+	decode_le_uint32(&p[12], &num);
+	if (num != 0) return GSS_S_BAD_MIC;
+
+        return GSS_S_COMPLETE;
+    }
+
+    return GSS_S_UNAVAILABLE;
+}