1 /***************************************************************************
2  *                                  _   _ ____  _
3  *  Project                     ___| | | |  _ \| |
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6  *                             \___|\___/|_| \_\_____|
7  *
8  * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@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 "strcase.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 = NULL;
78   char *tmp = NULL;
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->http_proxy.user;
99     passwdp = conn->http_proxy.passwd;
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) {
144     tmp = strchr((char *)uripath, '?');
145     if(tmp) {
146       size_t urilen = tmp - (char *)uripath;
147       path = (unsigned char *) aprintf("%.*s", urilen, uripath);
148     }
149   }
150   if(!tmp)
151     path = (unsigned char *) strdup((char *) uripath);
152 
153   if(!path)
154     return CURLE_OUT_OF_MEMORY;
155 
156   result = Curl_auth_create_digest_http_message(data, userp, passwdp, request,
157                                                 path, digest, &response, &len);
158   free(path);
159   if(result)
160     return result;
161 
162   *allocuserpwd = aprintf("%sAuthorization: Digest %s\r\n",
163                           proxy ? "Proxy-" : "",
164                           response);
165   free(response);
166   if(!*allocuserpwd)
167     return CURLE_OUT_OF_MEMORY;
168 
169   authp->done = TRUE;
170 
171   return CURLE_OK;
172 }
173 
174 void Curl_digest_cleanup(struct Curl_easy *data)
175 {
176   Curl_auth_digest_cleanup(&data->state.digest);
177   Curl_auth_digest_cleanup(&data->state.proxydigest);
178 }
179 
180 #endif
181