Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 360 insertions, 0 deletions

diff --git a/third_party/heimdal/lib/gssapi/krb5/verify_mic.c b/third_party/heimdal/lib/gssapi/krb5/verify_mic.c
new file mode 100644
index 0000000..4a776c8
--- /dev/null
+++ b/third_party/heimdal/lib/gssapi/krb5/verify_mic.c
@@ -0,0 +1,360 @@
+/*
+ * 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 "gsskrb5_locl.h"
+
+#ifdef HEIM_WEAK_CRYPTO
+
+static OM_uint32
+verify_mic_des
+           (OM_uint32 * minor_status,
+            const gsskrb5_ctx context_handle,
+	    krb5_context context,
+            const gss_buffer_t message_buffer,
+            const gss_buffer_t token_buffer,
+            gss_qop_t * qop_state,
+	    krb5_keyblock *key,
+	    const char *type
+	    )
+{
+  u_char *p;
+  EVP_MD_CTX *md5;
+  u_char hash[16], *seq;
+  DES_key_schedule schedule;
+  EVP_CIPHER_CTX des_ctx;
+  DES_cblock zero;
+  DES_cblock deskey;
+  uint32_t seq_number;
+  OM_uint32 ret;
+  int cmp;
+
+  p = token_buffer->value;
+  ret = _gsskrb5_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 = EVP_MD_CTX_create();
+  EVP_DigestInit_ex(md5, EVP_md5(), NULL);
+  EVP_DigestUpdate(md5, p - 24, 8);
+  EVP_DigestUpdate(md5, message_buffer->value, message_buffer->length);
+  EVP_DigestFinal_ex(md5, hash, NULL);
+  EVP_MD_CTX_destroy(md5);
+
+  memset (&zero, 0, sizeof(zero));
+  memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
+
+  DES_set_key_unchecked (&deskey, &schedule);
+  DES_cbc_cksum ((void *)hash, (void *)hash, sizeof(hash),
+		 &schedule, &zero);
+  if (ct_memcmp (p - 8, hash, 8) != 0) {
+    memset_s(deskey, sizeof(deskey), 0, sizeof(deskey));
+    memset_s(&schedule, sizeof(schedule), 0, sizeof(schedule));
+    return GSS_S_BAD_MIC;
+  }
+
+  /* verify sequence number */
+
+  HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
+
+  p -= 16;
+
+  EVP_CIPHER_CTX_init(&des_ctx);
+  EVP_CipherInit_ex(&des_ctx, EVP_des_cbc(), NULL, key->keyvalue.data, hash, 0);
+  EVP_Cipher(&des_ctx, p, p, 8);
+  EVP_CIPHER_CTX_cleanup(&des_ctx);
+
+  memset_s(deskey, sizeof(deskey), 0, sizeof(deskey));
+  memset_s(&schedule, sizeof(schedule), 0, sizeof(schedule));
+
+  seq = p;
+  _gss_mg_decode_be_uint32(seq, &seq_number);
+
+  if (context_handle->more_flags & LOCAL)
+      cmp = ct_memcmp(&seq[4], "\xff\xff\xff\xff", 4);
+  else
+      cmp = ct_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;
+}
+#endif
+
+static OM_uint32
+verify_mic_des3
+           (OM_uint32 * minor_status,
+            const gsskrb5_ctx context_handle,
+	    krb5_context context,
+            const gss_buffer_t message_buffer,
+            const gss_buffer_t token_buffer,
+            gss_qop_t * qop_state,
+	    krb5_keyblock *key,
+	    const char *type
+	    )
+{
+  u_char *p;
+  u_char *seq;
+  uint32_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 = _gsskrb5_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(context, key,
+			 ETYPE_DES3_CBC_NONE, &crypto);
+  if (ret){
+      *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 (context,
+			   crypto,
+			   KRB5_KU_USAGE_SEQ,
+			   p, 8, &seq_data, ivec);
+  if (ret) {
+      if (docompat++) {
+	  krb5_crypto_destroy (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 (context, crypto);
+	  return GSS_S_BAD_MIC;
+      } else
+	  goto retry;
+  }
+
+  HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
+
+  seq = seq_data.data;
+  _gss_mg_decode_be_uint32(seq, &seq_number);
+
+  if (context_handle->more_flags & LOCAL)
+      cmp = ct_memcmp(&seq[4], "\xff\xff\xff\xff", 4);
+  else
+      cmp = ct_memcmp(&seq[4], "\x00\x00\x00\x00", 4);
+
+  krb5_data_free (&seq_data);
+  if (cmp != 0) {
+      krb5_crypto_destroy (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 (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 (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;
+
+  krb5_crypto_destroy (context, crypto);
+  ret = krb5_crypto_init(context, key,
+			 ETYPE_DES3_CBC_SHA1, &crypto);
+  if (ret == 0)
+      ret = krb5_verify_checksum(context, crypto,
+                                 KRB5_KU_USAGE_SIGN,
+                                 tmp, message_buffer->length + 8,
+                                 &csum);
+  free (tmp);
+  if (ret) {
+      krb5_crypto_destroy (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 (context, crypto);
+  return GSS_S_COMPLETE;
+}
+
+OM_uint32
+_gsskrb5_verify_mic_internal
+           (OM_uint32 * minor_status,
+            const gsskrb5_ctx ctx,
+	    krb5_context context,
+            const gss_buffer_t message_buffer,
+            const gss_buffer_t token_buffer,
+            gss_qop_t * qop_state,
+	    const char * type
+	    )
+{
+    krb5_keyblock *key;
+    OM_uint32 ret;
+
+    if (ctx->more_flags & IS_CFX)
+        return _gssapi_verify_mic_cfx (minor_status, ctx,
+				       context, message_buffer, token_buffer,
+				       qop_state);
+
+    HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
+    ret = _gsskrb5i_get_token_key(ctx, context, &key);
+    HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
+    if (ret) {
+	*minor_status = ret;
+	return GSS_S_FAILURE;
+    }
+    *minor_status = 0;
+
+    switch (key->keytype) {
+    case KRB5_ENCTYPE_DES_CBC_CRC :
+    case KRB5_ENCTYPE_DES_CBC_MD4 :
+    case KRB5_ENCTYPE_DES_CBC_MD5 :
+#ifdef HEIM_WEAK_CRYPTO
+	ret = verify_mic_des (minor_status, ctx, context,
+			      message_buffer, token_buffer, qop_state, key,
+			      type);
+#else
+      ret = GSS_S_FAILURE;
+#endif
+	break;
+    case KRB5_ENCTYPE_DES3_CBC_MD5 :
+    case KRB5_ENCTYPE_DES3_CBC_SHA1 :
+	ret = verify_mic_des3 (minor_status, ctx, context,
+			       message_buffer, token_buffer, qop_state, key,
+			       type);
+	break;
+    case KRB5_ENCTYPE_ARCFOUR_HMAC_MD5:
+    case KRB5_ENCTYPE_ARCFOUR_HMAC_MD5_56:
+	ret = _gssapi_verify_mic_arcfour (minor_status, ctx,
+					  context,
+					  message_buffer, token_buffer,
+					  qop_state, key, type);
+	break;
+    default :
+        abort();
+    }
+    krb5_free_keyblock (context, key);
+
+    return ret;
+}
+
+OM_uint32 GSSAPI_CALLCONV
+_gsskrb5_verify_mic
+           (OM_uint32 * minor_status,
+            gss_const_ctx_id_t context_handle,
+            const gss_buffer_t message_buffer,
+            const gss_buffer_t token_buffer,
+            gss_qop_t * qop_state
+	    )
+{
+    krb5_context context;
+    OM_uint32 ret;
+
+    GSSAPI_KRB5_INIT (&context);
+
+    if (qop_state != NULL)
+	*qop_state = GSS_C_QOP_DEFAULT;
+
+    ret = _gsskrb5_verify_mic_internal(minor_status,
+				       (gsskrb5_ctx)context_handle,
+				       context,
+				       message_buffer, token_buffer,
+				       qop_state, (void *)(intptr_t)"\x01\x01");
+
+    return ret;
+}