Commit 09662337 authored by georgeok's avatar georgeok Committed by Marcel Raad
Browse files

ntlm_sspi: add support for channel binding 

Windows extended potection (aka ssl channel binding) is required
to login to ntlm IIS endpoint, otherwise the server returns 401
responses.

Fixes #3280
Closes #3321
parent 6ee67297

lib/urldata.h

+6 −0
Original line number Diff line number Diff line
@@ -328,6 +328,12 @@ struct kerberos5data { 
struct ntlmdata {

  curlntlm state;

#ifdef USE_WINDOWS_SSPI

/* The sslContext is used for the Schannel bindings. The

 * api is available on the Windows 7 SDK and later.

 */

#ifdef SECPKG_ATTR_ENDPOINT_BINDINGS

  CtxtHandle *sslContext;

#endif

  CredHandle *credentials;

  CtxtHandle *context;

  SEC_WINNT_AUTH_IDENTITY identity;

lib/vauth/ntlm_sspi.c

+35 −8
Original line number Diff line number Diff line
@@ -5,7 +5,7 @@ 
 *                            | (__| |_| |  _ <| |___

 *                             \___|\___/|_| \_\_____|

 *

 * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.

 * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.

 *

 * This software is licensed as described in the file COPYING, which

 * you should have received as part of this distribution. The terms
@@ -249,7 +249,7 @@ CURLcode Curl_auth_create_ntlm_type3_message(struct Curl_easy *data, 
                                             char **outptr, size_t *outlen)

{

  CURLcode result = CURLE_OK;

  SecBuffer type_2_buf;

  SecBuffer type_2_bufs[2];

  SecBuffer type_3_buf;

  SecBufferDesc type_2_desc;

  SecBufferDesc type_3_desc;
@@ -263,10 +263,37 @@ CURLcode Curl_auth_create_ntlm_type3_message(struct Curl_easy *data, 
  /* Setup the type-2 "input" security buffer */

  type_2_desc.ulVersion     = SECBUFFER_VERSION;

  type_2_desc.cBuffers      = 1;

  type_2_desc.pBuffers  = &type_2_buf;

  type_2_buf.BufferType = SECBUFFER_TOKEN;

  type_2_buf.pvBuffer   = ntlm->input_token;

  type_2_buf.cbBuffer   = curlx_uztoul(ntlm->input_token_len);

  type_2_desc.pBuffers      = &type_2_bufs[0];

  type_2_bufs[0].BufferType = SECBUFFER_TOKEN;

  type_2_bufs[0].pvBuffer   = ntlm->input_token;

  type_2_bufs[0].cbBuffer   = curlx_uztoul(ntlm->input_token_len);



#ifdef SECPKG_ATTR_ENDPOINT_BINDINGS

  /* ssl context comes from schannel.

  * When extended protection is used in IIS server,

  * we have to pass a second SecBuffer to the SecBufferDesc

  * otherwise IIS will not pass the authentication (401 response).

  * Minimum supported version is Windows 7.

  * https://docs.microsoft.com/en-us/security-updates

  * /SecurityAdvisories/2009/973811

  */

  if(ntlm->sslContext) {

    SEC_CHANNEL_BINDINGS channelBindings;

    SecPkgContext_Bindings pkgBindings;

    pkgBindings.Bindings = &channelBindings;

    status = s_pSecFn->QueryContextAttributes(

      ntlm->sslContext,

      SECPKG_ATTR_ENDPOINT_BINDINGS,

      &pkgBindings

    );

    if(status == SEC_E_OK) {

      type_2_desc.cBuffers++;

      type_2_bufs[1].BufferType = SECBUFFER_CHANNEL_BINDINGS;

      type_2_bufs[1].cbBuffer = pkgBindings.BindingsLength;

      type_2_bufs[1].pvBuffer = pkgBindings.Bindings;

    }

  }

#endif



  /* Setup the type-3 "output" security buffer */

  type_3_desc.ulVersion = SECBUFFER_VERSION;

lib/vtls/schannel.c

+10 −0
Original line number Diff line number Diff line
@@ -1414,6 +1414,16 @@ schannel_connect_common(struct connectdata *conn, int sockindex, 
    connssl->state = ssl_connection_complete;

    conn->recv[sockindex] = schannel_recv;

    conn->send[sockindex] = schannel_send;



#ifdef SECPKG_ATTR_ENDPOINT_BINDINGS

    /* When SSPI is used in combination with Schannel

     * we need the Schannel context to create the Schannel

     * binding to pass the IIS extended protection checks.

     * Available on Windows 7 or later.

     */

    conn->ntlm.sslContext = &BACKEND->ctxt->ctxt_handle;

#endif



    *done = TRUE;

  }

  else