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      1 /***************************************************************************
      2  *                                  _   _ ____  _
      3  *  Project                     ___| | | |  _ \| |
      4  *                             / __| | | | |_) | |
      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel (at) haxx.se>, et al.
      9  *
     10  * This software is licensed as described in the file COPYING, which
     11  * you should have received as part of this distribution. The terms
     12  * are also available at https://curl.haxx.se/docs/copyright.html.
     13  *
     14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
     15  * copies of the Software, and permit persons to whom the Software is
     16  * furnished to do so, under the terms of the COPYING file.
     17  *
     18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
     19  * KIND, either express or implied.
     20  *
     21  ***************************************************************************/
     22 
     23 #include "curl_setup.h"
     24 
     25 #if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_CRYPTO_AUTH)
     26 
     27 #include "urldata.h"
     28 #include "rawstr.h"
     29 #include "vauth/vauth.h"
     30 #include "http_digest.h"
     31 /* The last 3 #include files should be in this order */
     32 #include "curl_printf.h"
     33 #include "curl_memory.h"
     34 #include "memdebug.h"
     35 
     36 /* Test example headers:
     37 
     38 WWW-Authenticate: Digest realm="testrealm", nonce="1053604598"
     39 Proxy-Authenticate: Digest realm="testrealm", nonce="1053604598"
     40 
     41 */
     42 
     43 CURLcode Curl_input_digest(struct connectdata *conn,
     44                            bool proxy,
     45                            const char *header) /* rest of the *-authenticate:
     46                                                   header */
     47 {
     48   struct Curl_easy *data = conn->data;
     49 
     50   /* Point to the correct struct with this */
     51   struct digestdata *digest;
     52 
     53   if(proxy) {
     54     digest = &data->state.proxydigest;
     55   }
     56   else {
     57     digest = &data->state.digest;
     58   }
     59 
     60   if(!checkprefix("Digest", header))
     61     return CURLE_BAD_CONTENT_ENCODING;
     62 
     63   header += strlen("Digest");
     64   while(*header && ISSPACE(*header))
     65     header++;
     66 
     67   return Curl_auth_decode_digest_http_message(header, digest);
     68 }
     69 
     70 CURLcode Curl_output_digest(struct connectdata *conn,
     71                             bool proxy,
     72                             const unsigned char *request,
     73                             const unsigned char *uripath)
     74 {
     75   CURLcode result;
     76   struct Curl_easy *data = conn->data;
     77   unsigned char *path;
     78   char *tmp;
     79   char *response;
     80   size_t len;
     81   bool have_chlg;
     82 
     83   /* Point to the address of the pointer that holds the string to send to the
     84      server, which is for a plain host or for a HTTP proxy */
     85   char **allocuserpwd;
     86 
     87   /* Point to the name and password for this */
     88   const char *userp;
     89   const char *passwdp;
     90 
     91   /* Point to the correct struct with this */
     92   struct digestdata *digest;
     93   struct auth *authp;
     94 
     95   if(proxy) {
     96     digest = &data->state.proxydigest;
     97     allocuserpwd = &conn->allocptr.proxyuserpwd;
     98     userp = conn->proxyuser;
     99     passwdp = conn->proxypasswd;
    100     authp = &data->state.authproxy;
    101   }
    102   else {
    103     digest = &data->state.digest;
    104     allocuserpwd = &conn->allocptr.userpwd;
    105     userp = conn->user;
    106     passwdp = conn->passwd;
    107     authp = &data->state.authhost;
    108   }
    109 
    110   Curl_safefree(*allocuserpwd);
    111 
    112   /* not set means empty */
    113   if(!userp)
    114     userp = "";
    115 
    116   if(!passwdp)
    117     passwdp = "";
    118 
    119 #if defined(USE_WINDOWS_SSPI)
    120   have_chlg = digest->input_token ? TRUE : FALSE;
    121 #else
    122   have_chlg = digest->nonce ? TRUE : FALSE;
    123 #endif
    124 
    125   if(!have_chlg) {
    126     authp->done = FALSE;
    127     return CURLE_OK;
    128   }
    129 
    130   /* So IE browsers < v7 cut off the URI part at the query part when they
    131      evaluate the MD5 and some (IIS?) servers work with them so we may need to
    132      do the Digest IE-style. Note that the different ways cause different MD5
    133      sums to get sent.
    134 
    135      Apache servers can be set to do the Digest IE-style automatically using
    136      the BrowserMatch feature:
    137      https://httpd.apache.org/docs/2.2/mod/mod_auth_digest.html#msie
    138 
    139      Further details on Digest implementation differences:
    140      http://www.fngtps.com/2006/09/http-authentication
    141   */
    142 
    143   if(authp->iestyle && ((tmp = strchr((char *)uripath, '?')) != NULL)) {
    144     size_t urilen = tmp - (char *)uripath;
    145 
    146     path = (unsigned char *) aprintf("%.*s", urilen, uripath);
    147   }
    148   else
    149     path = (unsigned char *) strdup((char *) uripath);
    150 
    151   if(!path)
    152     return CURLE_OUT_OF_MEMORY;
    153 
    154   result = Curl_auth_create_digest_http_message(data, userp, passwdp, request,
    155                                                 path, digest, &response, &len);
    156   free(path);
    157   if(result)
    158     return result;
    159 
    160   *allocuserpwd = aprintf("%sAuthorization: Digest %s\r\n",
    161                           proxy ? "Proxy-" : "",
    162                           response);
    163   free(response);
    164   if(!*allocuserpwd)
    165     return CURLE_OUT_OF_MEMORY;
    166 
    167   authp->done = TRUE;
    168 
    169   return CURLE_OK;
    170 }
    171 
    172 void Curl_digest_cleanup(struct Curl_easy *data)
    173 {
    174   Curl_auth_digest_cleanup(&data->state.digest);
    175   Curl_auth_digest_cleanup(&data->state.proxydigest);
    176 }
    177 
    178 #endif
    179