1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2020, 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
32 /* The last 3 #include files should be in this order */
33 #include "curl_printf.h"
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 Curl_easy *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_auth_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 Curl_easy *data = conn->data;
78 unsigned char *path = NULL;
79 char *tmp = NULL;
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 #ifdef CURL_DISABLE_PROXY
98 return CURLE_NOT_BUILT_IN;
99 #else
100 digest = &data->state.proxydigest;
101 allocuserpwd = &data->state.aptr.proxyuserpwd;
102 userp = conn->http_proxy.user;
103 passwdp = conn->http_proxy.passwd;
104 authp = &data->state.authproxy;
105 #endif
106 }
107 else {
108 digest = &data->state.digest;
109 allocuserpwd = &data->state.aptr.userpwd;
110 userp = conn->user;
111 passwdp = conn->passwd;
112 authp = &data->state.authhost;
113 }
114
115 Curl_safefree(*allocuserpwd);
116
117 /* not set means empty */
118 if(!userp)
119 userp = "";
120
121 if(!passwdp)
122 passwdp = "";
123
124 #if defined(USE_WINDOWS_SSPI)
125 have_chlg = digest->input_token ? TRUE : FALSE;
126 #else
127 have_chlg = digest->nonce ? TRUE : FALSE;
128 #endif
129
130 if(!have_chlg) {
131 authp->done = FALSE;
132 return CURLE_OK;
133 }
134
135 /* So IE browsers < v7 cut off the URI part at the query part when they
136 evaluate the MD5 and some (IIS?) servers work with them so we may need to
137 do the Digest IE-style. Note that the different ways cause different MD5
138 sums to get sent.
139
140 Apache servers can be set to do the Digest IE-style automatically using
141 the BrowserMatch feature:
142 https://httpd.apache.org/docs/2.2/mod/mod_auth_digest.html#msie
143
144 Further details on Digest implementation differences:
145 http://www.fngtps.com/2006/09/http-authentication
146 */
147
148 if(authp->iestyle) {
149 tmp = strchr((char *)uripath, '?');
150 if(tmp) {
151 size_t urilen = tmp - (char *)uripath;
152 path = (unsigned char *) aprintf("%.*s", urilen, uripath);
153 }
154 }
155 if(!tmp)
156 path = (unsigned char *) strdup((char *) uripath);
157
158 if(!path)
159 return CURLE_OUT_OF_MEMORY;
160
161 result = Curl_auth_create_digest_http_message(data, userp, passwdp, request,
162 path, digest, &response, &len);
163 free(path);
164 if(result)
165 return result;
166
167 *allocuserpwd = aprintf("%sAuthorization: Digest %s\r\n",
168 proxy ? "Proxy-" : "",
169 response);
170 free(response);
171 if(!*allocuserpwd)
172 return CURLE_OUT_OF_MEMORY;
173
174 authp->done = TRUE;
175
176 return CURLE_OK;
177 }
178
Curl_http_auth_cleanup_digest(struct Curl_easy * data)179 void Curl_http_auth_cleanup_digest(struct Curl_easy *data)
180 {
181 Curl_auth_digest_cleanup(&data->state.digest);
182 Curl_auth_digest_cleanup(&data->state.proxydigest);
183 }
184
185 #endif
186