1: /***************************************************************************
2: * _ _ ____ _
3: * Project ___| | | | _ \| |
4: * / __| | | | |_) | |
5: * | (__| |_| | _ <| |___
6: * \___|\___/|_| \_\_____|
7: *
8: * Copyright (C) 1998 - 2019, 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: * RFC4178 Simple and Protected GSS-API Negotiation Mechanism
22: *
23: ***************************************************************************/
24:
25: #include "curl_setup.h"
26:
27: #if defined(HAVE_GSSAPI) && defined(USE_SPNEGO)
28:
29: #include <curl/curl.h>
30:
31: #include "vauth/vauth.h"
32: #include "urldata.h"
33: #include "curl_base64.h"
34: #include "curl_gssapi.h"
35: #include "warnless.h"
36: #include "curl_multibyte.h"
37: #include "sendf.h"
38:
39: /* The last #include files should be: */
40: #include "curl_memory.h"
41: #include "memdebug.h"
42:
43: /*
44: * Curl_auth_is_spnego_supported()
45: *
46: * This is used to evaluate if SPNEGO (Negotiate) is supported.
47: *
48: * Parameters: None
49: *
50: * Returns TRUE if Negotiate supported by the GSS-API library.
51: */
52: bool Curl_auth_is_spnego_supported(void)
53: {
54: return TRUE;
55: }
56:
57: /*
58: * Curl_auth_decode_spnego_message()
59: *
60: * This is used to decode an already encoded SPNEGO (Negotiate) challenge
61: * message.
62: *
63: * Parameters:
64: *
65: * data [in] - The session handle.
66: * userp [in] - The user name in the format User or Domain\User.
67: * passwdp [in] - The user's password.
68: * service [in] - The service type such as http, smtp, pop or imap.
69: * host [in] - The host name.
70: * chlg64 [in] - The optional base64 encoded challenge message.
71: * nego [in/out] - The Negotiate data struct being used and modified.
72: *
73: * Returns CURLE_OK on success.
74: */
75: CURLcode Curl_auth_decode_spnego_message(struct Curl_easy *data,
76: const char *user,
77: const char *password,
78: const char *service,
79: const char *host,
80: const char *chlg64,
81: struct negotiatedata *nego)
82: {
83: CURLcode result = CURLE_OK;
84: size_t chlglen = 0;
85: unsigned char *chlg = NULL;
86: OM_uint32 major_status;
87: OM_uint32 minor_status;
88: OM_uint32 unused_status;
89: gss_buffer_desc spn_token = GSS_C_EMPTY_BUFFER;
90: gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
91: gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
92:
93: (void) user;
94: (void) password;
95:
96: if(nego->context && nego->status == GSS_S_COMPLETE) {
97: /* We finished successfully our part of authentication, but server
98: * rejected it (since we're again here). Exit with an error since we
99: * can't invent anything better */
100: Curl_auth_cleanup_spnego(nego);
101: return CURLE_LOGIN_DENIED;
102: }
103:
104: if(!nego->spn) {
105: /* Generate our SPN */
106: char *spn = Curl_auth_build_spn(service, NULL, host);
107: if(!spn)
108: return CURLE_OUT_OF_MEMORY;
109:
110: /* Populate the SPN structure */
111: spn_token.value = spn;
112: spn_token.length = strlen(spn);
113:
114: /* Import the SPN */
115: major_status = gss_import_name(&minor_status, &spn_token,
116: GSS_C_NT_HOSTBASED_SERVICE,
117: &nego->spn);
118: if(GSS_ERROR(major_status)) {
119: Curl_gss_log_error(data, "gss_import_name() failed: ",
120: major_status, minor_status);
121:
122: free(spn);
123:
124: return CURLE_AUTH_ERROR;
125: }
126:
127: free(spn);
128: }
129:
130: if(chlg64 && *chlg64) {
131: /* Decode the base-64 encoded challenge message */
132: if(*chlg64 != '=') {
133: result = Curl_base64_decode(chlg64, &chlg, &chlglen);
134: if(result)
135: return result;
136: }
137:
138: /* Ensure we have a valid challenge message */
139: if(!chlg) {
140: infof(data, "SPNEGO handshake failure (empty challenge message)\n");
141:
142: return CURLE_BAD_CONTENT_ENCODING;
143: }
144:
145: /* Setup the challenge "input" security buffer */
146: input_token.value = chlg;
147: input_token.length = chlglen;
148: }
149:
150: /* Generate our challenge-response message */
151: major_status = Curl_gss_init_sec_context(data,
152: &minor_status,
153: &nego->context,
154: nego->spn,
155: &Curl_spnego_mech_oid,
156: GSS_C_NO_CHANNEL_BINDINGS,
157: &input_token,
158: &output_token,
159: TRUE,
160: NULL);
161:
162: /* Free the decoded challenge as it is not required anymore */
163: Curl_safefree(input_token.value);
164:
165: nego->status = major_status;
166: if(GSS_ERROR(major_status)) {
167: if(output_token.value)
168: gss_release_buffer(&unused_status, &output_token);
169:
170: Curl_gss_log_error(data, "gss_init_sec_context() failed: ",
171: major_status, minor_status);
172:
173: return CURLE_AUTH_ERROR;
174: }
175:
176: if(!output_token.value || !output_token.length) {
177: if(output_token.value)
178: gss_release_buffer(&unused_status, &output_token);
179:
180: return CURLE_AUTH_ERROR;
181: }
182:
183: /* Free previous token */
184: if(nego->output_token.length && nego->output_token.value)
185: gss_release_buffer(&unused_status, &nego->output_token);
186:
187: nego->output_token = output_token;
188:
189: return CURLE_OK;
190: }
191:
192: /*
193: * Curl_auth_create_spnego_message()
194: *
195: * This is used to generate an already encoded SPNEGO (Negotiate) response
196: * message ready for sending to the recipient.
197: *
198: * Parameters:
199: *
200: * data [in] - The session handle.
201: * nego [in/out] - The Negotiate data struct being used and modified.
202: * outptr [in/out] - The address where a pointer to newly allocated memory
203: * holding the result will be stored upon completion.
204: * outlen [out] - The length of the output message.
205: *
206: * Returns CURLE_OK on success.
207: */
208: CURLcode Curl_auth_create_spnego_message(struct Curl_easy *data,
209: struct negotiatedata *nego,
210: char **outptr, size_t *outlen)
211: {
212: CURLcode result;
213: OM_uint32 minor_status;
214:
215: /* Base64 encode the already generated response */
216: result = Curl_base64_encode(data,
217: nego->output_token.value,
218: nego->output_token.length,
219: outptr, outlen);
220:
221: if(result) {
222: gss_release_buffer(&minor_status, &nego->output_token);
223: nego->output_token.value = NULL;
224: nego->output_token.length = 0;
225:
226: return result;
227: }
228:
229: if(!*outptr || !*outlen) {
230: gss_release_buffer(&minor_status, &nego->output_token);
231: nego->output_token.value = NULL;
232: nego->output_token.length = 0;
233:
234: return CURLE_REMOTE_ACCESS_DENIED;
235: }
236:
237: return CURLE_OK;
238: }
239:
240: /*
241: * Curl_auth_cleanup_spnego()
242: *
243: * This is used to clean up the SPNEGO (Negotiate) specific data.
244: *
245: * Parameters:
246: *
247: * nego [in/out] - The Negotiate data struct being cleaned up.
248: *
249: */
250: void Curl_auth_cleanup_spnego(struct negotiatedata *nego)
251: {
252: OM_uint32 minor_status;
253:
254: /* Free our security context */
255: if(nego->context != GSS_C_NO_CONTEXT) {
256: gss_delete_sec_context(&minor_status, &nego->context, GSS_C_NO_BUFFER);
257: nego->context = GSS_C_NO_CONTEXT;
258: }
259:
260: /* Free the output token */
261: if(nego->output_token.value) {
262: gss_release_buffer(&minor_status, &nego->output_token);
263: nego->output_token.value = NULL;
264: nego->output_token.length = 0;
265:
266: }
267:
268: /* Free the SPN */
269: if(nego->spn != GSS_C_NO_NAME) {
270: gss_release_name(&minor_status, &nego->spn);
271: nego->spn = GSS_C_NO_NAME;
272: }
273:
274: /* Reset any variables */
275: nego->status = 0;
276: nego->noauthpersist = FALSE;
277: nego->havenoauthpersist = FALSE;
278: nego->havenegdata = FALSE;
279: nego->havemultiplerequests = FALSE;
280: }
281:
282: #endif /* HAVE_GSSAPI && USE_SPNEGO */
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