1 files changed, 289 insertions, 0 deletions
diff --git a/plugin/win_auth_client/handshake.cc b/plugin/win_auth_client/handshake.cc
new file mode 100644
index 00000000..cd63ee26
--- /dev/null
+++ b/plugin/win_auth_client/handshake.cc
@@ -0,0 +1,289 @@
+/* Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1335  USA */
+
+#include "handshake.h"
+
+
+/** Handshake class implementation **********************************/
+
+/**
+  Create common part of handshake context.
+
+  @param[in]  ssp   name of the SSP (Security Service Provider) to
+                    be used for authentication
+  @param[in]  side  is this handshake object used for server- or
+                    client-side handshake
+
+  Prepare for handshake using the @c ssp security module. We use
+  "Negotiate" which picks best available module. Parameter @c side
+  tells if this is preparing for server or client side authentication
+  and is used to prepare appropriate credentials.
+*/
+
+Handshake::Handshake(const char *ssp, side_t side)
+: m_atts(0L), m_error(0), m_complete(FALSE),
+  m_have_credentials(false), m_have_sec_context(false)
+#ifndef DBUG_OFF
+  , m_ssp_info(NULL)
+#endif
+{
+  SECURITY_STATUS ret;
+
+  // Obtain credentials for the authentication handshake.
+
+  ret= AcquireCredentialsHandle(NULL, (SEC_CHAR*)ssp,
+         side == SERVER ? SECPKG_CRED_INBOUND : SECPKG_CRED_OUTBOUND,
+         NULL, NULL, NULL, NULL, &m_cred, &m_expire);
+
+  if (ret != SEC_E_OK)
+  {
+    DBUG_PRINT("error", ("AcqireCredentialsHandle() failed"
+                         " with error %X", ret));
+    ERROR_LOG(ERROR, ("Could not obtain local credentials"
+                      " required for authentication"));
+    m_error= ret;
+  }
+
+  m_have_credentials= true;
+}
+
+
+Handshake::~Handshake()
+{
+  if (m_have_credentials)
+    FreeCredentialsHandle(&m_cred);
+  if (m_have_sec_context)
+    DeleteSecurityContext(&m_sctx);
+  m_output.free();
+
+#ifndef DBUG_OFF
+  if (m_ssp_info)
+    FreeContextBuffer(m_ssp_info);
+#endif
+}
+
+
+/**
+  Read and process data packets from the other end of a connection.
+
+  @param[IN] con  a connection to read packets from
+
+  Packets are read and processed until authentication handshake is 
+  complete. It is assumed that the peer will send at least one packet. 
+  Packets are processed with @c process_data() method. If new data is
+  generated during packet processing, this data is sent to the peer and
+  another round of packet exchange starts.
+
+  @return 0 on success.
+
+  @note In case of error, appropriate error message is logged.
+*/
+int Handshake::packet_processing_loop()
+{
+  m_round= 0;
+
+  do {
+    ++m_round;
+    // Read packet send by the peer
+
+    DBUG_PRINT("info", ("Waiting for packet"));
+    Blob packet= read_packet();
+    if (error())
+    {
+      ERROR_LOG(ERROR, ("Error reading packet in round %d", m_round));
+      return 1;
+    }
+    DBUG_PRINT("info", ("Got packet of length %d", packet.len()));
+
+    /*
+      Process received data, possibly generating new data to be sent.
+    */
+
+    Blob new_data= process_data(packet);
+
+    if (error())
+    {
+      ERROR_LOG(ERROR, ("Error processing packet in round %d", m_round));
+      return 1;
+    }
+
+    /*
+      If new data has been generated, send it to the peer. Otherwise
+      handshake must be completed.
+    */
+
+    if (!new_data.is_null())
+    {
+      DBUG_PRINT("info", ("Round %d started", m_round));
+
+      DBUG_PRINT("info", ("Sending packet of length %d", new_data.len()));
+      int ret= write_packet(new_data);
+      if (ret)
+      {
+        ERROR_LOG(ERROR, ("Error writing packet in round %d", m_round));
+        return 1;
+      }
+      DBUG_PRINT("info", ("Data sent"));
+    }
+    else if (!is_complete())
+    {
+      ERROR_LOG(ERROR, ("No data to send in round %d"
+                        " but handshake is not complete", m_round));
+      return 1;
+    }
+
+    /*
+      To protect against malicious clients, break handshake exchange if
+      too many rounds.
+    */
+
+    if (m_round > MAX_HANDSHAKE_ROUNDS)
+    {
+      ERROR_LOG(ERROR, ("Authentication handshake could not be completed"
+                        " after %d rounds", m_round));
+      return 1;
+    }
+
+  } while(!is_complete());
+
+  ERROR_LOG(INFO, ("Handshake completed after %d rounds", m_round));
+  return 0;
+}
+
+
+#ifndef DBUG_OFF
+
+/**
+  Get name of the security package which was used in authentication.
+
+  This method should be called only after handshake was completed. It is
+  available only in debug builds.
+
+  @return Name of security package or NULL if it can not be obtained.
+*/
+
+const char* Handshake::ssp_name()
+{
+  if (!m_ssp_info && m_complete)
+  {
+    SecPkgContext_PackageInfo pinfo;
+
+    int ret= QueryContextAttributes(&m_sctx, SECPKG_ATTR_PACKAGE_INFO, &pinfo);
+
+    if (SEC_E_OK == ret)
+    {
+      m_ssp_info= pinfo.PackageInfo;
+    }
+    else
+      DBUG_PRINT("error",
+                 ("Could not obtain SSP info from authentication context"
+                  ", QueryContextAttributes() failed with error %X", ret));
+  }
+
+  return m_ssp_info ? m_ssp_info->Name : NULL;
+}
+
+#endif
+
+
+/**
+  Process result of @c {Initialize,Accept}SecurityContext() function.
+
+  @param[in]  ret   return code from @c {Initialize,Accept}SecurityContext()
+                    function
+
+  This function analyses return value of Windows
+  @c {Initialize,Accept}SecurityContext() function. A call to
+  @c CompleteAuthToken() is done if requested. If authentication is complete,
+  this fact is marked in the internal state of the Handshake object.
+  If errors are detected the object is moved to error state.
+
+  @return True if error has been detected.
+*/
+
+bool Handshake::process_result(int ret)
+{
+  /*
+    First check for errors and set the m_complete flag if the result
+    indicates that handshake is complete.
+  */
+
+  switch (ret)
+  {
+  case SEC_E_OK:
+  case SEC_I_COMPLETE_NEEDED:
+    // Handshake completed
+    m_complete= true;
+    break;
+
+  case SEC_I_CONTINUE_NEEDED:
+  case SEC_I_COMPLETE_AND_CONTINUE:
+    break;
+
+  default:
+    m_error= ret;
+    return true;
+  }
+
+  m_have_sec_context= true;
+
+  /*
+    If the result indicates a need for this, complete the authentication
+    token.
+  */
+
+  switch (ret)
+  {
+  case SEC_I_COMPLETE_NEEDED:
+  case SEC_I_COMPLETE_AND_CONTINUE:
+    ret= CompleteAuthToken(&m_sctx, &m_output);
+    if (ret != 0)
+    {
+      DBUG_PRINT("error", ("CompleteAuthToken() failed with error %X", ret));
+      m_error= ret;
+      return true;
+    }
+  default:
+    break;
+  }
+
+  return false;
+}
+
+
+/** Security_buffer class implementation **********************************/
+
+
+Security_buffer::Security_buffer(const Blob &blob): m_allocated(false)
+{
+  init(blob.ptr(), blob.len());
+}
+
+
+Security_buffer::Security_buffer(): m_allocated(true)
+{
+  init(NULL, 0);
+}
+
+
+void Security_buffer::free(void)
+{
+  if (!m_allocated)
+    return;
+  if (!ptr())
+    return;
+  FreeContextBuffer(ptr());
+  m_allocated= false;
+}