r8302: import mini HEIMDAL into the tree

(This used to be commit 118be28a7aef233799956615a99d1a2a74dac175)

1 files changed, 336 insertions, 0 deletions

diff --git a/source4/heimdal/lib/gssapi/verify_mic.c b/source4/heimdal/lib/gssapi/verify_mic.c
new file mode 100644
index 0000000000..7b7d437e99
--- /dev/null
+++ b/source4/heimdal/lib/gssapi/verify_mic.c
@@ -0,0 +1,336 @@
+/*
+ * Copyright (c) 1997 - 2003 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: verify_mic.c,v 1.32 2005/04/27 17:51:04 lha Exp $");
+
+static OM_uint32
+verify_mic_des
+           (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,
+	    krb5_keyblock *key,
+	    char *type
+	    )
+{
+  u_char *p;
+  MD5_CTX md5;
+  u_char hash[16], *seq;
+  DES_key_schedule schedule;
+  DES_cblock zero;
+  DES_cblock deskey;
+  int32_t seq_number;
+  OM_uint32 ret;
+  int cmp;
+
+  p = token_buffer->value;
+  ret = gssapi_krb5_verify_header (&p,
+				   token_buffer->length,
+				   type,
+				   GSS_KRB5_MECHANISM);
+  if (ret)
+      return ret;
+
+  if (memcmp(p, "\x00\x00", 2) != 0)
+      return GSS_S_BAD_SIG;
+  p += 2;
+  if (memcmp (p, "\xff\xff\xff\xff", 4) != 0)
+    return GSS_S_BAD_MIC;
+  p += 4;
+  p += 16;
+
+  /* verify checksum */
+  MD5_Init (&md5);
+  MD5_Update (&md5, p - 24, 8);
+  MD5_Update (&md5, message_buffer->value,
+	     message_buffer->length);
+  MD5_Final (hash, &md5);
+
+  memset (&zero, 0, sizeof(zero));
+  memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
+
+  DES_set_key (&deskey, &schedule);
+  DES_cbc_cksum ((void *)hash, (void *)hash, sizeof(hash),
+		 &schedule, &zero);
+  if (memcmp (p - 8, hash, 8) != 0) {
+    memset (deskey, 0, sizeof(deskey));
+    memset (&schedule, 0, sizeof(schedule));
+    return GSS_S_BAD_MIC;
+  }
+
+  /* verify sequence number */
+  
+  HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
+
+  p -= 16;
+  DES_set_key (&deskey, &schedule);
+  DES_cbc_encrypt ((void *)p, (void *)p, 8,
+		   &schedule, (DES_cblock *)hash, DES_DECRYPT);
+
+  memset (deskey, 0, sizeof(deskey));
+  memset (&schedule, 0, sizeof(schedule));
+
+  seq = p;
+  gssapi_decode_om_uint32(seq, &seq_number);
+
+  if (context_handle->more_flags & LOCAL)
+      cmp = memcmp(&seq[4], "\xff\xff\xff\xff", 4);
+  else
+      cmp = memcmp(&seq[4], "\x00\x00\x00\x00", 4);
+
+  if (cmp != 0) {
+    HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+    return GSS_S_BAD_MIC;
+  }
+
+  ret = _gssapi_msg_order_check(context_handle->order, seq_number);
+  if (ret) {
+      HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+      return ret;
+  }
+
+  HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+
+  return GSS_S_COMPLETE;
+}
+
+static OM_uint32
+verify_mic_des3
+           (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,
+	    krb5_keyblock *key,
+	    char *type
+	    )
+{
+  u_char *p;
+  u_char *seq;
+  int32_t seq_number;
+  OM_uint32 ret;
+  krb5_crypto crypto;
+  krb5_data seq_data;
+  int cmp, docompat;
+  Checksum csum;
+  char *tmp;
+  char ivec[8];
+  
+  p = token_buffer->value;
+  ret = gssapi_krb5_verify_header (&p,
+				   token_buffer->length,
+				   type,
+				   GSS_KRB5_MECHANISM);
+  if (ret)
+      return ret;
+
+  if (memcmp(p, "\x04\x00", 2) != 0) /* SGN_ALG = HMAC SHA1 DES3-KD */
+      return GSS_S_BAD_SIG;
+  p += 2;
+  if (memcmp (p, "\xff\xff\xff\xff", 4) != 0)
+    return GSS_S_BAD_MIC;
+  p += 4;
+
+  ret = krb5_crypto_init(gssapi_krb5_context, key,
+			 ETYPE_DES3_CBC_NONE, &crypto);
+  if (ret){
+      gssapi_krb5_set_error_string ();
+      *minor_status = ret;
+      return GSS_S_FAILURE;
+  }
+
+  /* verify sequence number */
+  docompat = 0;
+retry:
+  if (docompat)
+      memset(ivec, 0, 8);
+  else
+      memcpy(ivec, p + 8, 8);
+
+  ret = krb5_decrypt_ivec (gssapi_krb5_context,
+			   crypto,
+			   KRB5_KU_USAGE_SEQ,
+			   p, 8, &seq_data, ivec);
+  if (ret) {
+      if (docompat++) {
+	  gssapi_krb5_set_error_string ();
+	  krb5_crypto_destroy (gssapi_krb5_context, crypto);
+	  *minor_status = ret;
+	  return GSS_S_FAILURE;
+      } else
+	  goto retry;
+  }
+
+  if (seq_data.length != 8) {
+      krb5_data_free (&seq_data);
+      if (docompat++) {
+	  krb5_crypto_destroy (gssapi_krb5_context, crypto);
+	  return GSS_S_BAD_MIC;
+      } else
+	  goto retry;
+  }
+
+  HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
+
+  seq = seq_data.data;
+  gssapi_decode_om_uint32(seq, &seq_number);
+
+  if (context_handle->more_flags & LOCAL)
+      cmp = memcmp(&seq[4], "\xff\xff\xff\xff", 4);
+  else
+      cmp = memcmp(&seq[4], "\x00\x00\x00\x00", 4);
+
+  krb5_data_free (&seq_data);
+  if (cmp != 0) {
+      krb5_crypto_destroy (gssapi_krb5_context, crypto);
+      *minor_status = 0;
+      HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+      return GSS_S_BAD_MIC;
+  }
+
+  ret = _gssapi_msg_order_check(context_handle->order, seq_number);
+  if (ret) {
+      krb5_crypto_destroy (gssapi_krb5_context, crypto);
+      *minor_status = 0;
+      HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+      return ret;
+  }
+
+  /* verify checksum */
+
+  tmp = malloc (message_buffer->length + 8);
+  if (tmp == NULL) {
+      krb5_crypto_destroy (gssapi_krb5_context, crypto);
+      HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+      *minor_status = ENOMEM;
+      return GSS_S_FAILURE;
+  }
+
+  memcpy (tmp, p - 8, 8);
+  memcpy (tmp + 8, message_buffer->value, message_buffer->length);
+
+  csum.cksumtype = CKSUMTYPE_HMAC_SHA1_DES3;
+  csum.checksum.length = 20;
+  csum.checksum.data   = p + 8;
+
+  ret = krb5_verify_checksum (gssapi_krb5_context, crypto,
+			      KRB5_KU_USAGE_SIGN,
+			      tmp, message_buffer->length + 8,
+			      &csum);
+  free (tmp);
+  if (ret) {
+      gssapi_krb5_set_error_string ();
+      krb5_crypto_destroy (gssapi_krb5_context, crypto);
+      *minor_status = ret;
+      HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+      return GSS_S_BAD_MIC;
+  }
+  HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+
+  krb5_crypto_destroy (gssapi_krb5_context, crypto);
+  return GSS_S_COMPLETE;
+}
+
+OM_uint32
+gss_verify_mic_internal
+           (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,
+	    char * type
+	    )
+{
+    krb5_keyblock *key;
+    OM_uint32 ret;
+    krb5_keytype keytype;
+
+    ret = gss_krb5_get_subkey(context_handle, &key);
+    if (ret) {
+	gssapi_krb5_set_error_string ();
+	*minor_status = ret;
+	return GSS_S_FAILURE;
+    }
+    *minor_status = 0;
+    krb5_enctype_to_keytype (gssapi_krb5_context, key->keytype, &keytype);
+    switch (keytype) {
+    case KEYTYPE_DES :
+	ret = verify_mic_des (minor_status, context_handle,
+			      message_buffer, token_buffer, qop_state, key,
+			      type);
+	break;
+    case KEYTYPE_DES3 :
+	ret = verify_mic_des3 (minor_status, context_handle,
+			       message_buffer, token_buffer, qop_state, key,
+			       type);
+	break;
+    case KEYTYPE_ARCFOUR :
+    case KEYTYPE_ARCFOUR_56 :
+	ret = _gssapi_verify_mic_arcfour (minor_status, context_handle,
+					  message_buffer, token_buffer,
+					  qop_state, key, type);
+	break;
+    default :
+	ret = _gssapi_verify_mic_cfx (minor_status, context_handle,
+				      message_buffer, token_buffer, qop_state,
+				      key);
+	break;
+    }
+    krb5_free_keyblock (gssapi_krb5_context, key);
+    
+    return ret;
+}
+
+OM_uint32
+gss_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
+	    )
+{
+    OM_uint32 ret;
+
+    if (qop_state != NULL)
+	*qop_state = GSS_C_QOP_DEFAULT;
+
+    ret = gss_verify_mic_internal(minor_status, context_handle, 
+				  message_buffer, token_buffer,
+				  qop_state, "\x01\x01");
+
+    return ret;
+}