- Flatten the vendor heimdal tree.

1 files changed, 422 insertions, 0 deletions

diff --git a/lib/gssapi/unwrap.c b/lib/gssapi/unwrap.c
new file mode 100644
index 0000000..b798438
--- /dev/null
+++ b/lib/gssapi/unwrap.c
@@ -0,0 +1,422 @@
+/*
+ * 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: unwrap.c,v 1.22.2.1 2003/09/18 22:05:22 lha Exp $");
+
+OM_uint32
+gss_krb5_get_remotekey(const gss_ctx_id_t context_handle,
+		       krb5_keyblock **key)
+{
+    krb5_keyblock *skey;
+
+    krb5_auth_con_getremotesubkey(gssapi_krb5_context,
+				  context_handle->auth_context, 
+				  &skey);
+    if(skey == NULL)
+	krb5_auth_con_getlocalsubkey(gssapi_krb5_context,
+				     context_handle->auth_context, 
+				     &skey);
+    if(skey == NULL)
+	krb5_auth_con_getkey(gssapi_krb5_context,
+			     context_handle->auth_context, 
+			     &skey);
+    if(skey == NULL)
+	return GSS_KRB5_S_KG_NO_SUBKEY; /* XXX */
+    *key = skey;
+    return 0;
+}
+
+static OM_uint32
+unwrap_des
+           (OM_uint32 * minor_status,
+            const gss_ctx_id_t context_handle,
+            const gss_buffer_t input_message_buffer,
+            gss_buffer_t output_message_buffer,
+            int * conf_state,
+            gss_qop_t * qop_state,
+	    krb5_keyblock *key
+           )
+{
+  u_char *p, *pad;
+  size_t len;
+  MD5_CTX md5;
+  u_char hash[16], seq_data[8];
+  des_key_schedule schedule;
+  des_cblock deskey;
+  des_cblock zero;
+  int i;
+  int32_t seq_number;
+  size_t padlength;
+  OM_uint32 ret;
+  int cstate;
+
+  p = input_message_buffer->value;
+  ret = gssapi_krb5_verify_header (&p,
+				   input_message_buffer->length,
+				   "\x02\x01");
+  if (ret)
+      return ret;
+
+  if (memcmp (p, "\x00\x00", 2) != 0)
+    return GSS_S_BAD_SIG;
+  p += 2;
+  if (memcmp (p, "\x00\x00", 2) == 0) {
+      cstate = 1;
+  } else if (memcmp (p, "\xFF\xFF", 2) == 0) {
+      cstate = 0;
+  } else
+      return GSS_S_BAD_MIC;
+  p += 2;
+  if(conf_state != NULL)
+      *conf_state = cstate;
+  if (memcmp (p, "\xff\xff", 2) != 0)
+    return GSS_S_DEFECTIVE_TOKEN;
+  p += 2;
+  p += 16;
+
+  len = p - (u_char *)input_message_buffer->value;
+
+  if(cstate) {
+      /* decrypt data */
+      memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
+
+      for (i = 0; i < sizeof(deskey); ++i)
+	  deskey[i] ^= 0xf0;
+      des_set_key (&deskey, schedule);
+      memset (&zero, 0, sizeof(zero));
+      des_cbc_encrypt ((void *)p,
+		       (void *)p,
+		       input_message_buffer->length - len,
+		       schedule,
+		       &zero,
+		       DES_DECRYPT);
+      
+      memset (deskey, 0, sizeof(deskey));
+      memset (schedule, 0, sizeof(schedule));
+  }
+  /* check pad */
+
+  pad = (u_char *)input_message_buffer->value + input_message_buffer->length - 1;
+  padlength = *pad;
+
+  for (i = padlength; i > 0 && *pad == padlength; i--, pad--)
+    ;
+  if (i != 0)
+    return GSS_S_BAD_MIC;
+
+  MD5_Init (&md5);
+  MD5_Update (&md5, p - 24, 8);
+  MD5_Update (&md5, p, input_message_buffer->length - len);
+  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)
+    return GSS_S_BAD_MIC;
+
+  /* verify sequence number */
+  
+  krb5_auth_getremoteseqnumber (gssapi_krb5_context,
+				context_handle->auth_context,
+				&seq_number);
+  seq_data[0] = (seq_number >> 0)  & 0xFF;
+  seq_data[1] = (seq_number >> 8)  & 0xFF;
+  seq_data[2] = (seq_number >> 16) & 0xFF;
+  seq_data[3] = (seq_number >> 24) & 0xFF;
+  memset (seq_data + 4,
+	  (context_handle->more_flags & LOCAL) ? 0xFF : 0,
+	  4);
+
+  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));
+
+  if (memcmp (p, seq_data, 8) != 0) {
+    return GSS_S_BAD_MIC;
+  }
+
+  krb5_auth_con_setremoteseqnumber (gssapi_krb5_context,
+				context_handle->auth_context,
+				++seq_number);
+
+  /* copy out data */
+
+  output_message_buffer->length = input_message_buffer->length
+    - len - padlength - 8;
+  output_message_buffer->value  = malloc(output_message_buffer->length);
+  if(output_message_buffer->length != 0 && output_message_buffer->value == NULL)
+      return GSS_S_FAILURE;
+  memcpy (output_message_buffer->value,
+	  p + 24,
+	  output_message_buffer->length);
+  return GSS_S_COMPLETE;
+}
+
+static OM_uint32
+unwrap_des3
+           (OM_uint32 * minor_status,
+            const gss_ctx_id_t context_handle,
+            const gss_buffer_t input_message_buffer,
+            gss_buffer_t output_message_buffer,
+            int * conf_state,
+            gss_qop_t * qop_state,
+	    krb5_keyblock *key
+           )
+{
+  u_char *p, *pad;
+  size_t len;
+  u_char seq[8];
+  krb5_data seq_data;
+  u_char cksum[20];
+  int i;
+  int32_t seq_number;
+  size_t padlength;
+  OM_uint32 ret;
+  int cstate;
+  krb5_crypto crypto;
+  Checksum csum;
+  int cmp;
+
+  p = input_message_buffer->value;
+  ret = gssapi_krb5_verify_header (&p,
+				   input_message_buffer->length,
+				   "\x02\x01");
+  if (ret)
+      return ret;
+
+  if (memcmp (p, "\x04\x00", 2) != 0) /* HMAC SHA1 DES3_KD */
+    return GSS_S_BAD_SIG;
+  p += 2;
+  if (memcmp (p, "\x02\x00", 2) == 0) {
+    cstate = 1;
+  } else if (memcmp (p, "\xff\xff", 2) == 0) {
+    cstate = 0;
+  } else
+    return GSS_S_BAD_MIC;
+  p += 2;
+  if(conf_state != NULL)
+    *conf_state = cstate;
+  if (memcmp (p, "\xff\xff", 2) != 0)
+    return GSS_S_DEFECTIVE_TOKEN;
+  p += 2;
+  p += 28;
+
+  len = p - (u_char *)input_message_buffer->value;
+
+  if(cstate) {
+      /* decrypt data */
+      krb5_data tmp;
+
+      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;
+      }
+      ret = krb5_decrypt(gssapi_krb5_context, crypto, KRB5_KU_USAGE_SEAL,
+			 p, input_message_buffer->length - len, &tmp);
+      krb5_crypto_destroy(gssapi_krb5_context, crypto);
+      if (ret) {
+	  gssapi_krb5_set_error_string ();
+	  *minor_status = ret;
+	  return GSS_S_FAILURE;
+      }
+      assert (tmp.length == input_message_buffer->length - len);
+
+      memcpy (p, tmp.data, tmp.length);
+      krb5_data_free(&tmp);
+  }
+  /* check pad */
+
+  pad = (u_char *)input_message_buffer->value + input_message_buffer->length - 1;
+  padlength = *pad;
+
+  for (i = padlength; i > 0 && *pad == padlength; i--, pad--)
+    ;
+  if (i != 0)
+    return GSS_S_BAD_MIC;
+
+  /* verify sequence number */
+  
+  krb5_auth_getremoteseqnumber (gssapi_krb5_context,
+				context_handle->auth_context,
+				&seq_number);
+  seq[0] = (seq_number >> 0)  & 0xFF;
+  seq[1] = (seq_number >> 8)  & 0xFF;
+  seq[2] = (seq_number >> 16) & 0xFF;
+  seq[3] = (seq_number >> 24) & 0xFF;
+  memset (seq + 4,
+	  (context_handle->more_flags & LOCAL) ? 0xFF : 0,
+	  4);
+
+  p -= 28;
+
+  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;
+  }
+  {
+      des_cblock ivec;
+
+      memcpy(&ivec, p + 8, 8);
+      ret = krb5_decrypt_ivec (gssapi_krb5_context,
+			       crypto,
+			       KRB5_KU_USAGE_SEQ,
+			       p, 8, &seq_data,
+			       &ivec);
+  }
+  krb5_crypto_destroy (gssapi_krb5_context, crypto);
+  if (ret) {
+      gssapi_krb5_set_error_string ();
+      *minor_status = ret;
+      return GSS_S_FAILURE;
+  }
+  if (seq_data.length != 8) {
+      krb5_data_free (&seq_data);
+      return GSS_S_BAD_MIC;
+  }
+
+  cmp = memcmp (seq, seq_data.data, seq_data.length);
+  krb5_data_free (&seq_data);
+  if (cmp != 0) {
+      return GSS_S_BAD_MIC;
+  }
+
+  krb5_auth_con_setremoteseqnumber (gssapi_krb5_context,
+				context_handle->auth_context,
+				++seq_number);
+
+  /* verify checksum */
+
+  memcpy (cksum, p + 8, 20);
+
+  memcpy (p + 20, p - 8, 8);
+
+  csum.cksumtype = CKSUMTYPE_HMAC_SHA1_DES3;
+  csum.checksum.length = 20;
+  csum.checksum.data   = cksum;
+
+  ret = krb5_crypto_init(gssapi_krb5_context, key, 0, &crypto);
+  if (ret) {
+      gssapi_krb5_set_error_string ();
+      *minor_status = ret;
+      return GSS_S_FAILURE;
+  }
+
+  ret = krb5_verify_checksum (gssapi_krb5_context, crypto,
+			      KRB5_KU_USAGE_SIGN,
+			      p + 20,
+			      input_message_buffer->length - len + 8,
+			      &csum);
+  krb5_crypto_destroy (gssapi_krb5_context, crypto);
+  if (ret) {
+      gssapi_krb5_set_error_string ();
+      *minor_status = ret;
+      return GSS_S_FAILURE;
+  }
+
+  /* copy out data */
+
+  output_message_buffer->length = input_message_buffer->length
+    - len - padlength - 8;
+  output_message_buffer->value  = malloc(output_message_buffer->length);
+  if(output_message_buffer->length != 0 && output_message_buffer->value == NULL)
+      return GSS_S_FAILURE;
+  memcpy (output_message_buffer->value,
+	  p + 36,
+	  output_message_buffer->length);
+  return GSS_S_COMPLETE;
+}
+
+OM_uint32 gss_unwrap
+           (OM_uint32 * minor_status,
+            const gss_ctx_id_t context_handle,
+            const gss_buffer_t input_message_buffer,
+            gss_buffer_t output_message_buffer,
+            int * conf_state,
+            gss_qop_t * qop_state
+           )
+{
+  krb5_keyblock *key;
+  OM_uint32 ret;
+  krb5_keytype keytype;
+
+  if (qop_state != NULL)
+      *qop_state = GSS_C_QOP_DEFAULT;
+  ret = gss_krb5_get_remotekey(context_handle, &key);
+  if (ret) {
+      gssapi_krb5_set_error_string ();
+      *minor_status = ret;
+      return GSS_S_FAILURE;
+  }
+  krb5_enctype_to_keytype (gssapi_krb5_context, key->keytype, &keytype);
+
+  *minor_status = 0;
+
+  switch (keytype) {
+  case KEYTYPE_DES :
+      ret = unwrap_des (minor_status, context_handle,
+			input_message_buffer, output_message_buffer,
+			conf_state, qop_state, key);
+      break;
+  case KEYTYPE_DES3 :
+      ret = unwrap_des3 (minor_status, context_handle,
+			 input_message_buffer, output_message_buffer,
+			 conf_state, qop_state, key);
+      break;
+  case KEYTYPE_ARCFOUR:
+      ret = _gssapi_unwrap_arcfour (minor_status, context_handle,
+				    input_message_buffer, output_message_buffer,
+				    conf_state, qop_state, key);
+      break;
+  default :
+      *minor_status = KRB5_PROG_ETYPE_NOSUPP;
+      ret = GSS_S_FAILURE;
+      break;
+  }
+  krb5_free_keyblock (gssapi_krb5_context, key);
+  return ret;
+}