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