spnego_sspi.c

Last change on this file was 104083, checked in by vboxsync, 9 months ago
curl-8.7.1: Applied and adjusted our curl changes to 8.4.0. bugref:10639
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File size: 11.7 KB

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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	* RFC4178 Simple and Protected GSS-API Negotiation Mechanism
24	*
25	***************************************************************************/
26
27	#include "curl_setup.h"
28
29	#if defined(USE_WINDOWS_SSPI) && defined(USE_SPNEGO)
30
31	#include <curl/curl.h>
32
33	#include "vauth/vauth.h"
34	#include "urldata.h"
35	#include "curl_base64.h"
36	#include "warnless.h"
37	#include "curl_multibyte.h"
38	#include "sendf.h"
39	#include "strerror.h"
40
41	/* The last #include files should be: */
42	#include "curl_memory.h"
43	#include "memdebug.h"
44
45	/*
46	* Curl_auth_is_spnego_supported()
47	*
48	* This is used to evaluate if SPNEGO (Negotiate) is supported.
49	*
50	* Parameters: None
51	*
52	* Returns TRUE if Negotiate is supported by Windows SSPI.
53	*/
54	bool Curl_auth_is_spnego_supported(void)
55	{
56	PSecPkgInfo SecurityPackage;
57	SECURITY_STATUS status;
58
59	/* Query the security package for Negotiate */
60	status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *)
61	TEXT(SP_NAME_NEGOTIATE),
62	&SecurityPackage);
63
64	/* Release the package buffer as it is not required anymore */
65	if(status == SEC_E_OK) {
66	s_pSecFn->FreeContextBuffer(SecurityPackage);
67	}
68
69
70	return (status == SEC_E_OK ? TRUE : FALSE);
71	}
72
73	/*
74	* Curl_auth_decode_spnego_message()
75	*
76	* This is used to decode an already encoded SPNEGO (Negotiate) challenge
77	* message.
78	*
79	* Parameters:
80	*
81	* data [in] - The session handle.
82	* user [in] - The user name in the format User or Domain\User.
83	* password [in] - The user's password.
84	* service [in] - The service type such as http, smtp, pop or imap.
85	* host [in] - The host name.
86	* chlg64 [in] - The optional base64 encoded challenge message.
87	* nego [in/out] - The Negotiate data struct being used and modified.
88	*
89	* Returns CURLE_OK on success.
90	*/
91	CURLcode Curl_auth_decode_spnego_message(struct Curl_easy *data,
92	const char *user,
93	const char *password,
94	const char *service,
95	const char *host,
96	const char *chlg64,
97	struct negotiatedata *nego)
98	{
99	CURLcode result = CURLE_OK;
100	size_t chlglen = 0;
101	unsigned char *chlg = NULL;
102	PSecPkgInfo SecurityPackage;
103	SecBuffer chlg_buf[2];
104	SecBuffer resp_buf;
105	SecBufferDesc chlg_desc;
106	SecBufferDesc resp_desc;
107	unsigned long attrs;
108	TimeStamp expiry; /* For Windows 9x compatibility of SSPI calls */
109
110	#if defined(CURL_DISABLE_VERBOSE_STRINGS)
111	(void) data;
112	#endif
113
114	if(nego->context && nego->status == SEC_E_OK) {
115	/* We finished successfully our part of authentication, but server
116	* rejected it (since we're again here). Exit with an error since we
117	* can't invent anything better */
118	Curl_auth_cleanup_spnego(nego);
119	return CURLE_LOGIN_DENIED;
120	}
121
122	if(!nego->spn) {
123	/* Generate our SPN */
124	nego->spn = Curl_auth_build_spn(service, host, NULL);
125	if(!nego->spn)
126	return CURLE_OUT_OF_MEMORY;
127	}
128
129	if(!nego->output_token) {
130	/* Query the security package for Negotiate */
131	nego->status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *)
132	TEXT(SP_NAME_NEGOTIATE),
133	&SecurityPackage);
134	if(nego->status != SEC_E_OK) {
135	failf(data, "SSPI: couldn't get auth info");
136	return CURLE_AUTH_ERROR;
137	}
138
139	nego->token_max = SecurityPackage->cbMaxToken;
140
141	/* Release the package buffer as it is not required anymore */
142	s_pSecFn->FreeContextBuffer(SecurityPackage);
143
144	/* Allocate our output buffer */
145	nego->output_token = malloc(nego->token_max);
146	if(!nego->output_token)
147	return CURLE_OUT_OF_MEMORY;
148	}
149
150	if(!nego->credentials) {
151	/* Do we have credentials to use or are we using single sign-on? */
152	if(user && *user) {
153	/* Populate our identity structure */
154	result = Curl_create_sspi_identity(user, password, &nego->identity);
155	if(result)
156	return result;
157
158	/* Allow proper cleanup of the identity structure */
159	nego->p_identity = &nego->identity;
160	}
161	else
162	/* Use the current Windows user */
163	nego->p_identity = NULL;
164
165	/* Allocate our credentials handle */
166	nego->credentials = calloc(1, sizeof(CredHandle));
167	if(!nego->credentials)
168	return CURLE_OUT_OF_MEMORY;
169
170	/* Acquire our credentials handle */
171	nego->status =
172	s_pSecFn->AcquireCredentialsHandle(NULL,
173	(TCHAR *)TEXT(SP_NAME_NEGOTIATE),
174	SECPKG_CRED_OUTBOUND, NULL,
175	nego->p_identity, NULL, NULL,
176	nego->credentials, &expiry);
177	if(nego->status != SEC_E_OK)
178	return CURLE_AUTH_ERROR;
179
180	/* Allocate our new context handle */
181	nego->context = calloc(1, sizeof(CtxtHandle));
182	if(!nego->context)
183	return CURLE_OUT_OF_MEMORY;
184	}
185
186	if(chlg64 && *chlg64) {
187	/* Decode the base-64 encoded challenge message */
188	if(*chlg64 != '=') {
189	result = Curl_base64_decode(chlg64, &chlg, &chlglen);
190	if(result)
191	return result;
192	}
193
194	/* Ensure we have a valid challenge message */
195	if(!chlg) {
196	infof(data, "SPNEGO handshake failure (empty challenge message)");
197	return CURLE_BAD_CONTENT_ENCODING;
198	}
199
200	/* Setup the challenge "input" security buffer */
201	chlg_desc.ulVersion = SECBUFFER_VERSION;
202	chlg_desc.cBuffers = 1;
203	chlg_desc.pBuffers = &chlg_buf[0];
204	chlg_buf[0].BufferType = SECBUFFER_TOKEN;
205	chlg_buf[0].pvBuffer = chlg;
206	chlg_buf[0].cbBuffer = curlx_uztoul(chlglen);
207
208	#ifdef SECPKG_ATTR_ENDPOINT_BINDINGS
209	/* ssl context comes from Schannel.
210	* When extended protection is used in IIS server,
211	* we have to pass a second SecBuffer to the SecBufferDesc
212	* otherwise IIS will not pass the authentication (401 response).
213	* Minimum supported version is Windows 7.
214	* https://docs.microsoft.com/en-us/security-updates
215	* /SecurityAdvisories/2009/973811
216	*/
217	if(nego->sslContext) {
218	SEC_CHANNEL_BINDINGS channelBindings;
219	SecPkgContext_Bindings pkgBindings;
220	pkgBindings.Bindings = &channelBindings;
221	nego->status = s_pSecFn->QueryContextAttributes(
222	nego->sslContext,
223	SECPKG_ATTR_ENDPOINT_BINDINGS,
224	&pkgBindings
225	);
226	if(nego->status == SEC_E_OK) {
227	chlg_desc.cBuffers++;
228	chlg_buf[1].BufferType = SECBUFFER_CHANNEL_BINDINGS;
229	chlg_buf[1].cbBuffer = pkgBindings.BindingsLength;
230	chlg_buf[1].pvBuffer = pkgBindings.Bindings;
231	}
232	}
233	#endif
234	}
235
236	/* Setup the response "output" security buffer */
237	resp_desc.ulVersion = SECBUFFER_VERSION;
238	resp_desc.cBuffers = 1;
239	resp_desc.pBuffers = &resp_buf;
240	resp_buf.BufferType = SECBUFFER_TOKEN;
241	resp_buf.pvBuffer = nego->output_token;
242	resp_buf.cbBuffer = curlx_uztoul(nego->token_max);
243
244	/* Generate our challenge-response message */
245	nego->status = s_pSecFn->InitializeSecurityContext(nego->credentials,
246	chlg ? nego->context :
247	NULL,
248	nego->spn,
249	ISC_REQ_CONFIDENTIALITY,
250	0, SECURITY_NATIVE_DREP,
251	chlg ? &chlg_desc : NULL,
252	0, nego->context,
253	&resp_desc, &attrs,
254	&expiry);
255
256	/* Free the decoded challenge as it is not required anymore */
257	free(chlg);
258
259	if(GSS_ERROR(nego->status)) {
260	char buffer[STRERROR_LEN];
261	failf(data, "InitializeSecurityContext failed: %s",
262	Curl_sspi_strerror(nego->status, buffer, sizeof(buffer)));
263
264	if(nego->status == (DWORD)SEC_E_INSUFFICIENT_MEMORY)
265	return CURLE_OUT_OF_MEMORY;
266
267	return CURLE_AUTH_ERROR;
268	}
269
270	if(nego->status == SEC_I_COMPLETE_NEEDED \|\|
271	nego->status == SEC_I_COMPLETE_AND_CONTINUE) {
272	nego->status = s_pSecFn->CompleteAuthToken(nego->context, &resp_desc);
273	if(GSS_ERROR(nego->status)) {
274	char buffer[STRERROR_LEN];
275	failf(data, "CompleteAuthToken failed: %s",
276	Curl_sspi_strerror(nego->status, buffer, sizeof(buffer)));
277
278	if(nego->status == (DWORD)SEC_E_INSUFFICIENT_MEMORY)
279	return CURLE_OUT_OF_MEMORY;
280
281	return CURLE_AUTH_ERROR;
282	}
283	}
284
285	nego->output_token_length = resp_buf.cbBuffer;
286
287	return result;
288	}
289
290	/*
291	* Curl_auth_create_spnego_message()
292	*
293	* This is used to generate an already encoded SPNEGO (Negotiate) response
294	* message ready for sending to the recipient.
295	*
296	* Parameters:
297	*
298	* data [in] - The session handle.
299	* nego [in/out] - The Negotiate data struct being used and modified.
300	* outptr [in/out] - The address where a pointer to newly allocated memory
301	* holding the result will be stored upon completion.
302	* outlen [out] - The length of the output message.
303	*
304	* Returns CURLE_OK on success.
305	*/
306	CURLcode Curl_auth_create_spnego_message(struct negotiatedata *nego,
307	char *outptr, size_t outlen)
308	{
309	/* Base64 encode the already generated response */
310	CURLcode result = Curl_base64_encode((const char *) nego->output_token,
311	nego->output_token_length, outptr,
312	outlen);
313	if(!result && (!outptr \|\| !outlen)) {
314	free(*outptr);
315	result = CURLE_REMOTE_ACCESS_DENIED;
316	}
317
318	return result;
319	}
320
321	/*
322	* Curl_auth_cleanup_spnego()
323	*
324	* This is used to clean up the SPNEGO (Negotiate) specific data.
325	*
326	* Parameters:
327	*
328	* nego [in/out] - The Negotiate data struct being cleaned up.
329	*
330	*/
331	void Curl_auth_cleanup_spnego(struct negotiatedata *nego)
332	{
333	/* Free our security context */
334	if(nego->context) {
335	s_pSecFn->DeleteSecurityContext(nego->context);
336	free(nego->context);
337	nego->context = NULL;
338	}
339
340	/* Free our credentials handle */
341	if(nego->credentials) {
342	s_pSecFn->FreeCredentialsHandle(nego->credentials);
343	free(nego->credentials);
344	nego->credentials = NULL;
345	}
346
347	/* Free our identity */
348	Curl_sspi_free_identity(nego->p_identity);
349	nego->p_identity = NULL;
350
351	/* Free the SPN and output token */
352	Curl_safefree(nego->spn);
353	Curl_safefree(nego->output_token);
354
355	/* Reset any variables */
356	nego->status = 0;
357	nego->token_max = 0;
358	nego->noauthpersist = FALSE;
359	nego->havenoauthpersist = FALSE;
360	nego->havenegdata = FALSE;
361	nego->havemultiplerequests = FALSE;
362	}
363
364	#endif /* USE_WINDOWS_SSPI && USE_SPNEGO */

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source: vbox/trunk/src/libs/curl-8.7.1/lib/vauth/spnego_sspi.c

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