/***************************************************************************

 *                                  _   _ ____  _

 *  Project                     ___| | | |  _ \| |

 *                             / __| | | | |_) | |

 *                            | (__| |_| |  _ <| |___

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

 *

 * Copyright (C) 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

 * are also available at https://curl.se/docs/copyright.html.

 *

 * You may opt to use, copy, modify, merge, publish, distribute and/or sell

 * copies of the Software, and permit persons to whom the Software is

 * furnished to do so, under the terms of the COPYING file.

 *

 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY

 * KIND, either express or implied.

 *

 * SPDX-License-Identifier: curl

 *

 ***************************************************************************/

#include "curl_setup.h"

#if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_DIGEST_AUTH)

#include "urldata.h"

#include "strcase.h"

#include "vauth/vauth.h"

#include "http_digest.h"

#include "curlx/strparse.h"

/* Test example headers:

WWW-Authenticate: Digest realm="testrealm", nonce="1053604598"

Proxy-Authenticate: Digest realm="testrealm", nonce="1053604598"

*/

CURLcode Curl_input_digest(struct Curl_easy *data,

                           bool proxy,

                           const char *header) /* rest of the *-authenticate:

                                                  header */

{

  /* Point to the correct struct with this */

  struct digestdata *digest;

  if(proxy) {

    digest = &data->state.proxydigest;

  }

  else {

    digest = &data->state.digest;

  }

  if(!checkprefix("Digest", header) || !ISBLANK(header[6]))

    return CURLE_BAD_CONTENT_ENCODING;

  header += strlen("Digest");

  curlx_str_passblanks(&header);

  return Curl_auth_decode_digest_http_message(header, digest);

}

CURLcode Curl_output_digest(struct Curl_easy *data,

                            bool proxy,

                            const unsigned char *request,

                            const unsigned char *uripath)

{

  CURLcode result;

  unsigned char *path = NULL;

  const char *tmp = NULL;

  char *response;

  size_t len;

  bool have_chlg;

  /* Point to the address of the pointer that holds the string to send to the

     server, which is for a plain host or for an HTTP proxy */

  char **allocuserpwd;

  /* Point to the name and password for this */

  const char *userp;

  const char *passwdp;

  /* Point to the correct struct with this */

  struct digestdata *digest;

  struct auth *authp;

  if(proxy) {

#ifdef CURL_DISABLE_PROXY

    return CURLE_NOT_BUILT_IN;

#else

    digest = &data->state.proxydigest;

    allocuserpwd = &data->state.aptr.proxyuserpwd;

    userp = data->state.aptr.proxyuser;

    passwdp = data->state.aptr.proxypasswd;

    authp = &data->state.authproxy;

#endif

  }

  else {

    digest = &data->state.digest;

    allocuserpwd = &data->state.aptr.userpwd;

    userp = data->state.aptr.user;

    passwdp = data->state.aptr.passwd;

    authp = &data->state.authhost;

  }

  Curl_safefree(*allocuserpwd);

  /* not set means empty */

  if(!userp)

    userp = "";

  if(!passwdp)

    passwdp = "";

#ifdef USE_WINDOWS_SSPI

  have_chlg = !!digest->input_token;

#else

  have_chlg = !!digest->nonce;

#endif

  if(!have_chlg) {

    authp->done = FALSE;

    return CURLE_OK;

  }

  /* So IE browsers < v7 cut off the URI part at the query part when they

     evaluate the MD5 and some (IIS?) servers work with them so we may need to

     do the Digest IE-style. Note that the different ways cause different MD5

     sums to get sent.

     Apache servers can be set to do the Digest IE-style automatically using

     the BrowserMatch feature:

     https://httpd.apache.org/docs/2.2/mod/mod_auth_digest.html#msie

     Further details on Digest implementation differences:

     https://web.archive.org/web/2009/fngtps.com/2006/09/http-authentication

  */

  if(authp->iestyle) {

    tmp = strchr((const char *)uripath, '?');

    if(tmp) {

      size_t urilen = tmp - (const char *)uripath;

      /* typecast is fine here since the value is always less than 32 bits */

      path = (unsigned char *)curl_maprintf("%.*s", (int)urilen, uripath);

    }

  }

  if(!tmp)

    path = (unsigned char *)curlx_strdup((const char *)uripath);

  if(!path)

    return CURLE_OUT_OF_MEMORY;

  result = Curl_auth_create_digest_http_message(data, userp, passwdp, request,

                                                path, digest, &response, &len);

  curlx_free(path);

  if(result)

    return result;

  *allocuserpwd = curl_maprintf("%sAuthorization: Digest %s\r\n",

                                proxy ? "Proxy-" : "", response);

  curlx_free(response);

  if(!*allocuserpwd)

    return CURLE_OUT_OF_MEMORY;

  authp->done = TRUE;

  return CURLE_OK;

}

void Curl_http_auth_cleanup_digest(struct Curl_easy *data)

{

  Curl_auth_digest_cleanup(&data->state.digest);

  Curl_auth_digest_cleanup(&data->state.proxydigest);

}

#endif