r19604: This is a massive commit, and I appologise in advance for it's size.

This merges Samba4 with lorikeet-heimdal, which itself has been
tracking Heimdal CVS for the past couple of weeks.

This is such a big change because Heimdal reorganised it's internal
structures, with the mechglue merge, and because many of our 'wishes' have been granted:  we now have DCE_STYLE GSSAPI, send_to_kdc hooks and many other features merged into the mainline code.  We have adapted to upstream's choice of API in these cases.

In gensec_gssapi and gensec_krb5, we either expect a valid PAC, or NO
PAC.  This matches windows behavour.  We also have an option to
require the PAC to be present (which allows us to automate the testing
of this code).

This also includes a restructure of how the kerberos dependencies are
handled, due to the fallout of the merge.

Andrew Bartlett
(This used to be commit 4826f1735197c2a471d771495e6d4c1051b4c471)

1 files changed, 416 insertions, 0 deletions

diff --git a/source4/heimdal/lib/gssapi/krb5/unwrap.c b/source4/heimdal/lib/gssapi/krb5/unwrap.c
new file mode 100644
index 0000000000..758390080c
--- /dev/null
+++ b/source4/heimdal/lib/gssapi/krb5/unwrap.c
@@ -0,0 +1,416 @@
+/*
+ * Copyright (c) 1997 - 2004 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 "krb5/gsskrb5_locl.h"
+
+RCSID("$Id: unwrap.c,v 1.38 2006/10/18 15:59:28 lha Exp $");
+
+static OM_uint32
+unwrap_des
+           (OM_uint32 * minor_status,
+            const gsskrb5_ctx 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, *seq;
+  size_t len;
+  MD5_CTX md5;
+  u_char hash[16];
+  DES_key_schedule schedule;
+  DES_cblock deskey;
+  DES_cblock zero;
+  int i;
+  uint32_t seq_number;
+  size_t padlength;
+  OM_uint32 ret;
+  int cstate;
+  int cmp;
+
+  p = input_message_buffer->value;
+  ret = _gsskrb5_verify_header (&p,
+				   input_message_buffer->length,
+				   "\x02\x01",
+				   GSS_KRB5_MECHANISM);
+  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 */
+  ret = _gssapi_verify_pad(input_message_buffer, 
+			   input_message_buffer->length - len,
+			   &padlength);
+  if (ret)
+      return ret;
+
+  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 */
+  
+  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;
+  _gsskrb5_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);
+
+  /* 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 gsskrb5_ctx 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;
+  size_t len;
+  u_char *seq;
+  krb5_data seq_data;
+  u_char cksum[20];
+  uint32_t seq_number;
+  size_t padlength;
+  OM_uint32 ret;
+  int cstate;
+  krb5_crypto crypto;
+  Checksum csum;
+  int cmp;
+
+  p = input_message_buffer->value;
+  ret = _gsskrb5_verify_header (&p,
+				   input_message_buffer->length,
+				   "\x02\x01",
+				   GSS_KRB5_MECHANISM);
+  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(_gsskrb5_context, key,
+			     ETYPE_DES3_CBC_NONE, &crypto);
+      if (ret) {
+	  _gsskrb5_set_error_string ();
+	  *minor_status = ret;
+	  return GSS_S_FAILURE;
+      }
+      ret = krb5_decrypt(_gsskrb5_context, crypto, KRB5_KU_USAGE_SEAL,
+			 p, input_message_buffer->length - len, &tmp);
+      krb5_crypto_destroy(_gsskrb5_context, crypto);
+      if (ret) {
+	  _gsskrb5_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 */
+  ret = _gssapi_verify_pad(input_message_buffer, 
+			   input_message_buffer->length - len,
+			   &padlength);
+  if (ret)
+      return ret;
+
+  /* verify sequence number */
+  
+  HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
+
+  p -= 28;
+
+  ret = krb5_crypto_init(_gsskrb5_context, key,
+			 ETYPE_DES3_CBC_NONE, &crypto);
+  if (ret) {
+      _gsskrb5_set_error_string ();
+      *minor_status = ret;
+      HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+      return GSS_S_FAILURE;
+  }
+  {
+      DES_cblock ivec;
+
+      memcpy(&ivec, p + 8, 8);
+      ret = krb5_decrypt_ivec (_gsskrb5_context,
+			       crypto,
+			       KRB5_KU_USAGE_SEQ,
+			       p, 8, &seq_data,
+			       &ivec);
+  }
+  krb5_crypto_destroy (_gsskrb5_context, crypto);
+  if (ret) {
+      _gsskrb5_set_error_string ();
+      *minor_status = ret;
+      HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+      return GSS_S_FAILURE;
+  }
+  if (seq_data.length != 8) {
+      krb5_data_free (&seq_data);
+      *minor_status = 0;
+      HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+      return GSS_S_BAD_MIC;
+  }
+
+  seq = seq_data.data;
+  _gsskrb5_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) {
+      *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) {
+      *minor_status = 0;
+      HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+      return ret;
+  }
+
+  HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+
+  /* 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(_gsskrb5_context, key, 0, &crypto);
+  if (ret) {
+      _gsskrb5_set_error_string ();
+      *minor_status = ret;
+      return GSS_S_FAILURE;
+  }
+
+  ret = krb5_verify_checksum (_gsskrb5_context, crypto,
+			      KRB5_KU_USAGE_SIGN,
+			      p + 20,
+			      input_message_buffer->length - len + 8,
+			      &csum);
+  krb5_crypto_destroy (_gsskrb5_context, crypto);
+  if (ret) {
+      _gsskrb5_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 _gsskrb5_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;
+  gsskrb5_ctx ctx = (gsskrb5_ctx) context_handle;
+
+  output_message_buffer->value = NULL;
+  output_message_buffer->length = 0;
+
+  if (qop_state != NULL)
+      *qop_state = GSS_C_QOP_DEFAULT;
+  HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
+  ret = _gsskrb5i_get_token_key(ctx, &key);
+  HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
+  if (ret) {
+      _gsskrb5_set_error_string ();
+      *minor_status = ret;
+      return GSS_S_FAILURE;
+  }
+  krb5_enctype_to_keytype (_gsskrb5_context, key->keytype, &keytype);
+
+  *minor_status = 0;
+
+  switch (keytype) {
+  case KEYTYPE_DES :
+      ret = unwrap_des (minor_status, ctx,
+			input_message_buffer, output_message_buffer,
+			conf_state, qop_state, key);
+      break;
+  case KEYTYPE_DES3 :
+      ret = unwrap_des3 (minor_status, ctx,
+			 input_message_buffer, output_message_buffer,
+			 conf_state, qop_state, key);
+      break;
+  case KEYTYPE_ARCFOUR:
+  case KEYTYPE_ARCFOUR_56:
+      ret = _gssapi_unwrap_arcfour (minor_status, ctx,
+				    input_message_buffer, output_message_buffer,
+				    conf_state, qop_state, key);
+      break;
+  default :
+      ret = _gssapi_unwrap_cfx (minor_status, ctx,
+				input_message_buffer, output_message_buffer,
+				conf_state, qop_state, key);
+      break;
+  }
+  krb5_free_keyblock (_gsskrb5_context, key);
+  return ret;
+}