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_SPNEGO)
28
29#include "urldata.h"
30#include "sendf.h"
31#include "http_negotiate.h"
32#include "vauth/vauth.h"
33
34/* The last 3 #include files should be in this order */
35#include "curl_printf.h"
36#include "curl_memory.h"
37#include "memdebug.h"
38
39CURLcode Curl_input_negotiate(struct Curl_easy *data, struct connectdata *conn,
40 bool proxy, const char *header)
41{
42 CURLcode result;
43 size_t len;
44
45 /* Point to the username, password, service and host */
46 const char *userp;
47 const char *passwdp;
48 const char *service;
49 const char *host;
50
51 /* Point to the correct struct with this */
52 struct negotiatedata *neg_ctx;
53 curlnegotiate state;
54
55 if(proxy) {
56#ifndef CURL_DISABLE_PROXY
57 userp = conn->http_proxy.user;
58 passwdp = conn->http_proxy.passwd;
59 service = data->set.str[STRING_PROXY_SERVICE_NAME] ?
60 data->set.str[STRING_PROXY_SERVICE_NAME] : "HTTP";
61 host = conn->http_proxy.host.name;
62 neg_ctx = &conn->proxyneg;
63 state = conn->proxy_negotiate_state;
64#else
65 return CURLE_NOT_BUILT_IN;
66#endif
67 }
68 else {
69 userp = conn->user;
70 passwdp = conn->passwd;
71 service = data->set.str[STRING_SERVICE_NAME] ?
72 data->set.str[STRING_SERVICE_NAME] : "HTTP";
73 host = conn->host.name;
74 neg_ctx = &conn->negotiate;
75 state = conn->http_negotiate_state;
76 }
77
78 /* Not set means empty */
79 if(!userp)
80 userp = "";
81
82 if(!passwdp)
83 passwdp = "";
84
85 /* Obtain the input token, if any */
86 header += strlen("Negotiate");
87 while(*header && ISBLANK(*header))
88 header++;
89
90 len = strlen(header);
91 neg_ctx->havenegdata = len != 0;
92 if(!len) {
93 if(state == GSS_AUTHSUCC) {
94 infof(data, "Negotiate auth restarted");
95 Curl_http_auth_cleanup_negotiate(conn);
96 }
97 else if(state != GSS_AUTHNONE) {
98 /* The server rejected our authentication and hasn't supplied any more
99 negotiation mechanisms */
100 Curl_http_auth_cleanup_negotiate(conn);
101 return CURLE_LOGIN_DENIED;
102 }
103 }
104
105 /* Supports SSL channel binding for Windows ISS extended protection */
106#if defined(USE_WINDOWS_SSPI) && defined(SECPKG_ATTR_ENDPOINT_BINDINGS)
107 neg_ctx->sslContext = conn->sslContext;
108#endif
109
110 /* Initialize the security context and decode our challenge */
111 result = Curl_auth_decode_spnego_message(data, userp, passwdp, service,
112 host, header, neg_ctx);
113
114 if(result)
115 Curl_http_auth_cleanup_negotiate(conn);
116
117 return result;
118}
119
120CURLcode Curl_output_negotiate(struct Curl_easy *data,
121 struct connectdata *conn, bool proxy)
122{
123 struct negotiatedata *neg_ctx = proxy ? &conn->proxyneg :
124 &conn->negotiate;
125 struct auth *authp = proxy ? &data->state.authproxy : &data->state.authhost;
126 curlnegotiate *state = proxy ? &conn->proxy_negotiate_state :
127 &conn->http_negotiate_state;
128 char *base64 = NULL;
129 size_t len = 0;
130 char *userp;
131 CURLcode result;
132
133 authp->done = FALSE;
134
135 if(*state == GSS_AUTHRECV) {
136 if(neg_ctx->havenegdata) {
137 neg_ctx->havemultiplerequests = TRUE;
138 }
139 }
140 else if(*state == GSS_AUTHSUCC) {
141 if(!neg_ctx->havenoauthpersist) {
142 neg_ctx->noauthpersist = !neg_ctx->havemultiplerequests;
143 }
144 }
145
146 if(neg_ctx->noauthpersist ||
147 (*state != GSS_AUTHDONE && *state != GSS_AUTHSUCC)) {
148
149 if(neg_ctx->noauthpersist && *state == GSS_AUTHSUCC) {
150 infof(data, "Curl_output_negotiate, "
151 "no persistent authentication: cleanup existing context");
152 Curl_http_auth_cleanup_negotiate(conn);
153 }
154 if(!neg_ctx->context) {
155 result = Curl_input_negotiate(data, conn, proxy, "Negotiate");
156 if(result == CURLE_AUTH_ERROR) {
157 /* negotiate auth failed, let's continue unauthenticated to stay
158 * compatible with the behavior before curl-7_64_0-158-g6c6035532 */
159 authp->done = TRUE;
160 return CURLE_OK;
161 }
162 else if(result)
163 return result;
164 }
165
166 result = Curl_auth_create_spnego_message(neg_ctx, &base64, &len);
167 if(result)
168 return result;
169
170 userp = aprintf("%sAuthorization: Negotiate %s\r\n", proxy ? "Proxy-" : "",
171 base64);
172
173 if(proxy) {
174 Curl_safefree(data->state.aptr.proxyuserpwd);
175 data->state.aptr.proxyuserpwd = userp;
176 }
177 else {
178 Curl_safefree(data->state.aptr.userpwd);
179 data->state.aptr.userpwd = userp;
180 }
181
182 free(base64);
183
184 if(!userp) {
185 return CURLE_OUT_OF_MEMORY;
186 }
187
188 *state = GSS_AUTHSENT;
189 #ifdef HAVE_GSSAPI
190 if(neg_ctx->status == GSS_S_COMPLETE ||
191 neg_ctx->status == GSS_S_CONTINUE_NEEDED) {
192 *state = GSS_AUTHDONE;
193 }
194 #else
195 #ifdef USE_WINDOWS_SSPI
196 if(neg_ctx->status == SEC_E_OK ||
197 neg_ctx->status == SEC_I_CONTINUE_NEEDED) {
198 *state = GSS_AUTHDONE;
199 }
200 #endif
201 #endif
202 }
203
204 if(*state == GSS_AUTHDONE || *state == GSS_AUTHSUCC) {
205 /* connection is already authenticated,
206 * don't send a header in future requests */
207 authp->done = TRUE;
208 }
209
210 neg_ctx->havenegdata = FALSE;
211
212 return CURLE_OK;
213}
214
215void Curl_http_auth_cleanup_negotiate(struct connectdata *conn)
216{
217 conn->http_negotiate_state = GSS_AUTHNONE;
218 conn->proxy_negotiate_state = GSS_AUTHNONE;
219
220 Curl_auth_cleanup_spnego(&conn->negotiate);
221 Curl_auth_cleanup_spnego(&conn->proxyneg);
222}
223
224#endif /* !CURL_DISABLE_HTTP && USE_SPNEGO */
225