1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
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 "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
38WWW-Authenticate: Digest realm="testrealm", nonce="1053604598"
39Proxy-Authenticate: Digest realm="testrealm", nonce="1053604598"
40
41*/
42
43CURLcode 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
70CURLcode 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
172void 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