1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2015, 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 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
Curl_input_digest(struct connectdata * conn,bool proxy,const char * header)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
Curl_output_digest(struct connectdata * conn,bool proxy,const unsigned char * request,const unsigned char * uripath)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
Curl_digest_cleanup(struct SessionHandle * data)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