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      1 /***************************************************************************
      2  *                                  _   _ ____  _
      3  *  Project                     ___| | | |  _ \| |
      4  *                             / __| | | | |_) | |
      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) 1998 - 2015, 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 http://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 "curl_sasl.h"
     30 #include "http_digest.h"
     31 #include "curl_printf.h"
     32 
     33 /* The last #include files should be: */
     34 #include "curl_memory.h"
     35 #include "memdebug.h"
     36 
     37 /* Test example headers:
     38 
     39 WWW-Authenticate: Digest realm="testrealm", nonce="1053604598"
     40 Proxy-Authenticate: Digest realm="testrealm", nonce="1053604598"
     41 
     42 */
     43 
     44 CURLcode Curl_input_digest(struct connectdata *conn,
     45                            bool proxy,
     46                            const char *header) /* rest of the *-authenticate:
     47                                                   header */
     48 {
     49   struct SessionHandle *data = conn->data;
     50 
     51   /* Point to the correct struct with this */
     52   struct digestdata *digest;
     53 
     54   if(proxy) {
     55     digest = &data->state.proxydigest;
     56   }
     57   else {
     58     digest = &data->state.digest;
     59   }
     60 
     61   if(!checkprefix("Digest", header))
     62     return CURLE_BAD_CONTENT_ENCODING;
     63 
     64   header += strlen("Digest");
     65   while(*header && ISSPACE(*header))
     66     header++;
     67 
     68   return Curl_sasl_decode_digest_http_message(header, digest);
     69 }
     70 
     71 CURLcode Curl_output_digest(struct connectdata *conn,
     72                             bool proxy,
     73                             const unsigned char *request,
     74                             const unsigned char *uripath)
     75 {
     76   CURLcode result;
     77   struct SessionHandle *data = conn->data;
     78   unsigned char *path;
     79   char *tmp;
     80   char *response;
     81   size_t len;
     82   bool have_chlg;
     83 
     84   /* Point to the address of the pointer that holds the string to send to the
     85      server, which is for a plain host or for a HTTP proxy */
     86   char **allocuserpwd;
     87 
     88   /* Point to the name and password for this */
     89   const char *userp;
     90   const char *passwdp;
     91 
     92   /* Point to the correct struct with this */
     93   struct digestdata *digest;
     94   struct auth *authp;
     95 
     96   if(proxy) {
     97     digest = &data->state.proxydigest;
     98     allocuserpwd = &conn->allocptr.proxyuserpwd;
     99     userp = conn->proxyuser;
    100     passwdp = conn->proxypasswd;
    101     authp = &data->state.authproxy;
    102   }
    103   else {
    104     digest = &data->state.digest;
    105     allocuserpwd = &conn->allocptr.userpwd;
    106     userp = conn->user;
    107     passwdp = conn->passwd;
    108     authp = &data->state.authhost;
    109   }
    110 
    111   Curl_safefree(*allocuserpwd);
    112 
    113   /* not set means empty */
    114   if(!userp)
    115     userp = "";
    116 
    117   if(!passwdp)
    118     passwdp = "";
    119 
    120 #if defined(USE_WINDOWS_SSPI)
    121   have_chlg = digest->input_token ? TRUE : FALSE;
    122 #else
    123   have_chlg = digest->nonce ? TRUE : FALSE;
    124 #endif
    125 
    126   if(!have_chlg) {
    127     authp->done = FALSE;
    128     return CURLE_OK;
    129   }
    130 
    131   /* So IE browsers < v7 cut off the URI part at the query part when they
    132      evaluate the MD5 and some (IIS?) servers work with them so we may need to
    133      do the Digest IE-style. Note that the different ways cause different MD5
    134      sums to get sent.
    135 
    136      Apache servers can be set to do the Digest IE-style automatically using
    137      the BrowserMatch feature:
    138      http://httpd.apache.org/docs/2.2/mod/mod_auth_digest.html#msie
    139 
    140      Further details on Digest implementation differences:
    141      http://www.fngtps.com/2006/09/http-authentication
    142   */
    143 
    144   if(authp->iestyle && ((tmp = strchr((char *)uripath, '?')) != NULL)) {
    145     size_t urilen = tmp - (char *)uripath;
    146 
    147     path = (unsigned char *) aprintf("%.*s", urilen, uripath);
    148   }
    149   else
    150     path = (unsigned char *) strdup((char *) uripath);
    151 
    152   if(!path)
    153     return CURLE_OUT_OF_MEMORY;
    154 
    155   result = Curl_sasl_create_digest_http_message(data, userp, passwdp, request,
    156                                                 path, digest, &response, &len);
    157   free(path);
    158   if(result)
    159     return result;
    160 
    161   *allocuserpwd = aprintf("%sAuthorization: Digest %s\r\n",
    162                           proxy ? "Proxy-" : "",
    163                           response);
    164   free(response);
    165   if(!*allocuserpwd)
    166     return CURLE_OUT_OF_MEMORY;
    167 
    168   authp->done = TRUE;
    169 
    170   return CURLE_OK;
    171 }
    172 
    173 void Curl_digest_cleanup(struct SessionHandle *data)
    174 {
    175   Curl_sasl_digest_cleanup(&data->state.digest);
    176   Curl_sasl_digest_cleanup(&data->state.proxydigest);
    177 }
    178 
    179 #endif
    180