1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 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.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 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24
25 #include "curl_setup.h"
26
27 #if !defined(CURL_DISABLE_HTTP) && defined(USE_NTLM)
28
29 /*
30 * NTLM details:
31 *
32 * https://davenport.sourceforge.net/ntlm.html
33 * https://www.innovation.ch/java/ntlm.html
34 */
35
36 #define DEBUG_ME 0
37
38 #include "urldata.h"
39 #include "sendf.h"
40 #include "strcase.h"
41 #include "http_ntlm.h"
42 #include "curl_ntlm_core.h"
43 #include "curl_base64.h"
44 #include "vauth/vauth.h"
45 #include "url.h"
46
47 /* SSL backend-specific #if branches in this file must be kept in the order
48 documented in curl_ntlm_core. */
49 #if defined(USE_WINDOWS_SSPI)
50 #include "curl_sspi.h"
51 #endif
52
53 /* The last 3 #include files should be in this order */
54 #include "curl_printf.h"
55 #include "curl_memory.h"
56 #include "memdebug.h"
57
58 #if DEBUG_ME
59 # define DEBUG_OUT(x) x
60 #else
61 # define DEBUG_OUT(x) Curl_nop_stmt
62 #endif
63
Curl_input_ntlm(struct Curl_easy * data,bool proxy,const char * header)64 CURLcode Curl_input_ntlm(struct Curl_easy *data,
65 bool proxy, /* if proxy or not */
66 const char *header) /* rest of the www-authenticate:
67 header */
68 {
69 /* point to the correct struct with this */
70 struct ntlmdata *ntlm;
71 curlntlm *state;
72 CURLcode result = CURLE_OK;
73 struct connectdata *conn = data->conn;
74
75 ntlm = proxy ? &conn->proxyntlm : &conn->ntlm;
76 state = proxy ? &conn->proxy_ntlm_state : &conn->http_ntlm_state;
77
78 if(checkprefix("NTLM", header)) {
79 header += strlen("NTLM");
80
81 while(*header && ISSPACE(*header))
82 header++;
83
84 if(*header) {
85 unsigned char *hdr;
86 size_t hdrlen;
87
88 result = Curl_base64_decode(header, &hdr, &hdrlen);
89 if(!result) {
90 struct bufref hdrbuf;
91
92 Curl_bufref_init(&hdrbuf);
93 Curl_bufref_set(&hdrbuf, hdr, hdrlen, curl_free);
94 result = Curl_auth_decode_ntlm_type2_message(data, &hdrbuf, ntlm);
95 Curl_bufref_free(&hdrbuf);
96 }
97 if(result)
98 return result;
99
100 *state = NTLMSTATE_TYPE2; /* We got a type-2 message */
101 }
102 else {
103 if(*state == NTLMSTATE_LAST) {
104 infof(data, "NTLM auth restarted");
105 Curl_http_auth_cleanup_ntlm(conn);
106 }
107 else if(*state == NTLMSTATE_TYPE3) {
108 infof(data, "NTLM handshake rejected");
109 Curl_http_auth_cleanup_ntlm(conn);
110 *state = NTLMSTATE_NONE;
111 return CURLE_REMOTE_ACCESS_DENIED;
112 }
113 else if(*state >= NTLMSTATE_TYPE1) {
114 infof(data, "NTLM handshake failure (internal error)");
115 return CURLE_REMOTE_ACCESS_DENIED;
116 }
117
118 *state = NTLMSTATE_TYPE1; /* We should send away a type-1 */
119 }
120 }
121
122 return result;
123 }
124
125 /*
126 * This is for creating NTLM header output
127 */
Curl_output_ntlm(struct Curl_easy * data,bool proxy)128 CURLcode Curl_output_ntlm(struct Curl_easy *data, bool proxy)
129 {
130 char *base64 = NULL;
131 size_t len = 0;
132 CURLcode result = CURLE_OK;
133 struct bufref ntlmmsg;
134
135 /* point to the address of the pointer that holds the string to send to the
136 server, which is for a plain host or for an HTTP proxy */
137 char **allocuserpwd;
138
139 /* point to the username, password, service and host */
140 const char *userp;
141 const char *passwdp;
142 const char *service = NULL;
143 const char *hostname = NULL;
144
145 /* point to the correct struct with this */
146 struct ntlmdata *ntlm;
147 curlntlm *state;
148 struct auth *authp;
149 struct connectdata *conn = data->conn;
150
151 DEBUGASSERT(conn);
152 DEBUGASSERT(data);
153
154 if(proxy) {
155 #ifndef CURL_DISABLE_PROXY
156 allocuserpwd = &data->state.aptr.proxyuserpwd;
157 userp = data->state.aptr.proxyuser;
158 passwdp = data->state.aptr.proxypasswd;
159 service = data->set.str[STRING_PROXY_SERVICE_NAME] ?
160 data->set.str[STRING_PROXY_SERVICE_NAME] : "HTTP";
161 hostname = conn->http_proxy.host.name;
162 ntlm = &conn->proxyntlm;
163 state = &conn->proxy_ntlm_state;
164 authp = &data->state.authproxy;
165 #else
166 return CURLE_NOT_BUILT_IN;
167 #endif
168 }
169 else {
170 allocuserpwd = &data->state.aptr.userpwd;
171 userp = data->state.aptr.user;
172 passwdp = data->state.aptr.passwd;
173 service = data->set.str[STRING_SERVICE_NAME] ?
174 data->set.str[STRING_SERVICE_NAME] : "HTTP";
175 hostname = conn->host.name;
176 ntlm = &conn->ntlm;
177 state = &conn->http_ntlm_state;
178 authp = &data->state.authhost;
179 }
180 authp->done = FALSE;
181
182 /* not set means empty */
183 if(!userp)
184 userp = "";
185
186 if(!passwdp)
187 passwdp = "";
188
189 #ifdef USE_WINDOWS_SSPI
190 if(!Curl_hSecDll) {
191 /* not thread safe and leaks - use curl_global_init() to avoid */
192 CURLcode err = Curl_sspi_global_init();
193 if(!Curl_hSecDll)
194 return err;
195 }
196 #ifdef SECPKG_ATTR_ENDPOINT_BINDINGS
197 ntlm->sslContext = conn->sslContext;
198 #endif
199 #endif
200
201 Curl_bufref_init(&ntlmmsg);
202
203 /* connection is already authenticated, do not send a header in future
204 * requests so go directly to NTLMSTATE_LAST */
205 if(*state == NTLMSTATE_TYPE3)
206 *state = NTLMSTATE_LAST;
207
208 switch(*state) {
209 case NTLMSTATE_TYPE1:
210 default: /* for the weird cases we (re)start here */
211 /* Create a type-1 message */
212 result = Curl_auth_create_ntlm_type1_message(data, userp, passwdp,
213 service, hostname,
214 ntlm, &ntlmmsg);
215 if(!result) {
216 DEBUGASSERT(Curl_bufref_len(&ntlmmsg) != 0);
217 result = Curl_base64_encode((const char *) Curl_bufref_ptr(&ntlmmsg),
218 Curl_bufref_len(&ntlmmsg), &base64, &len);
219 if(!result) {
220 free(*allocuserpwd);
221 *allocuserpwd = aprintf("%sAuthorization: NTLM %s\r\n",
222 proxy ? "Proxy-" : "",
223 base64);
224 free(base64);
225 if(!*allocuserpwd)
226 result = CURLE_OUT_OF_MEMORY;
227 }
228 }
229 break;
230
231 case NTLMSTATE_TYPE2:
232 /* We already received the type-2 message, create a type-3 message */
233 result = Curl_auth_create_ntlm_type3_message(data, userp, passwdp,
234 ntlm, &ntlmmsg);
235 if(!result && Curl_bufref_len(&ntlmmsg)) {
236 result = Curl_base64_encode((const char *) Curl_bufref_ptr(&ntlmmsg),
237 Curl_bufref_len(&ntlmmsg), &base64, &len);
238 if(!result) {
239 free(*allocuserpwd);
240 *allocuserpwd = aprintf("%sAuthorization: NTLM %s\r\n",
241 proxy ? "Proxy-" : "",
242 base64);
243 free(base64);
244 if(!*allocuserpwd)
245 result = CURLE_OUT_OF_MEMORY;
246 else {
247 *state = NTLMSTATE_TYPE3; /* we send a type-3 */
248 authp->done = TRUE;
249 }
250 }
251 }
252 break;
253
254 case NTLMSTATE_LAST:
255 Curl_safefree(*allocuserpwd);
256 authp->done = TRUE;
257 break;
258 }
259 Curl_bufref_free(&ntlmmsg);
260
261 return result;
262 }
263
Curl_http_auth_cleanup_ntlm(struct connectdata * conn)264 void Curl_http_auth_cleanup_ntlm(struct connectdata *conn)
265 {
266 Curl_auth_cleanup_ntlm(&conn->ntlm);
267 Curl_auth_cleanup_ntlm(&conn->proxyntlm);
268 }
269
270 #endif /* !CURL_DISABLE_HTTP && USE_NTLM */
271
