1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
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.
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.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 * RFC4178 Simple and Protected GSS-API Negotiation Mechanism
23 ***************************************************************************/
25 #include "curl_setup.h"
27 #if defined(HAVE_GSSAPI) && defined(USE_SPNEGO)
29 #include <curl/curl.h>
31 #include "vauth/vauth.h"
33 #include "curl_base64.h"
34 #include "curl_gssapi.h"
36 #include "curl_multibyte.h"
39 /* The last #include files should be: */
40 #include "curl_memory.h"
44 * Curl_auth_is_spnego_supported()
46 * This is used to evaluate if SPNEGO (Negotiate) is supported.
50 * Returns TRUE if Negotiate supported by the GSS-API library.
52 bool Curl_auth_is_spnego_supported(void)
58 * Curl_auth_decode_spnego_message()
60 * This is used to decode an already encoded SPNEGO (Negotiate) challenge
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.
73 * Returns CURLE_OK on success.
75 CURLcode Curl_auth_decode_spnego_message(struct Curl_easy *data,
81 struct negotiatedata *nego)
83 CURLcode result = CURLE_OK;
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;
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;
105 /* Generate our SPN */
106 char *spn = Curl_auth_build_spn(service, NULL, host);
108 return CURLE_OUT_OF_MEMORY;
110 /* Populate the SPN structure */
111 spn_token.value = spn;
112 spn_token.length = strlen(spn);
115 major_status = gss_import_name(&minor_status, &spn_token,
116 GSS_C_NT_HOSTBASED_SERVICE,
118 if(GSS_ERROR(major_status)) {
119 Curl_gss_log_error(data, "gss_import_name() failed: ",
120 major_status, minor_status);
124 return CURLE_AUTH_ERROR;
130 if(chlg64 && *chlg64) {
131 /* Decode the base-64 encoded challenge message */
133 result = Curl_base64_decode(chlg64, &chlg, &chlglen);
138 /* Ensure we have a valid challenge message */
140 infof(data, "SPNEGO handshake failure (empty challenge message)");
141 return CURLE_BAD_CONTENT_ENCODING;
144 /* Setup the challenge "input" security buffer */
145 input_token.value = chlg;
146 input_token.length = chlglen;
149 /* Generate our challenge-response message */
150 major_status = Curl_gss_init_sec_context(data,
154 &Curl_spnego_mech_oid,
155 GSS_C_NO_CHANNEL_BINDINGS,
161 /* Free the decoded challenge as it is not required anymore */
162 Curl_safefree(input_token.value);
164 nego->status = major_status;
165 if(GSS_ERROR(major_status)) {
166 if(output_token.value)
167 gss_release_buffer(&unused_status, &output_token);
169 Curl_gss_log_error(data, "gss_init_sec_context() failed: ",
170 major_status, minor_status);
172 return CURLE_AUTH_ERROR;
175 if(!output_token.value || !output_token.length) {
176 if(output_token.value)
177 gss_release_buffer(&unused_status, &output_token);
179 return CURLE_AUTH_ERROR;
182 /* Free previous token */
183 if(nego->output_token.length && nego->output_token.value)
184 gss_release_buffer(&unused_status, &nego->output_token);
186 nego->output_token = output_token;
192 * Curl_auth_create_spnego_message()
194 * This is used to generate an already encoded SPNEGO (Negotiate) response
195 * message ready for sending to the recipient.
199 * data [in] - The session handle.
200 * nego [in/out] - The Negotiate data struct being used and modified.
201 * outptr [in/out] - The address where a pointer to newly allocated memory
202 * holding the result will be stored upon completion.
203 * outlen [out] - The length of the output message.
205 * Returns CURLE_OK on success.
207 CURLcode Curl_auth_create_spnego_message(struct negotiatedata *nego,
208 char **outptr, size_t *outlen)
211 OM_uint32 minor_status;
213 /* Base64 encode the already generated response */
214 result = Curl_base64_encode(nego->output_token.value,
215 nego->output_token.length,
219 gss_release_buffer(&minor_status, &nego->output_token);
220 nego->output_token.value = NULL;
221 nego->output_token.length = 0;
226 if(!*outptr || !*outlen) {
227 gss_release_buffer(&minor_status, &nego->output_token);
228 nego->output_token.value = NULL;
229 nego->output_token.length = 0;
231 return CURLE_REMOTE_ACCESS_DENIED;
238 * Curl_auth_cleanup_spnego()
240 * This is used to clean up the SPNEGO (Negotiate) specific data.
244 * nego [in/out] - The Negotiate data struct being cleaned up.
247 void Curl_auth_cleanup_spnego(struct negotiatedata *nego)
249 OM_uint32 minor_status;
251 /* Free our security context */
252 if(nego->context != GSS_C_NO_CONTEXT) {
253 gss_delete_sec_context(&minor_status, &nego->context, GSS_C_NO_BUFFER);
254 nego->context = GSS_C_NO_CONTEXT;
257 /* Free the output token */
258 if(nego->output_token.value) {
259 gss_release_buffer(&minor_status, &nego->output_token);
260 nego->output_token.value = NULL;
261 nego->output_token.length = 0;
266 if(nego->spn != GSS_C_NO_NAME) {
267 gss_release_name(&minor_status, &nego->spn);
268 nego->spn = GSS_C_NO_NAME;
271 /* Reset any variables */
273 nego->noauthpersist = FALSE;
274 nego->havenoauthpersist = FALSE;
275 nego->havenegdata = FALSE;
276 nego->havemultiplerequests = FALSE;
279 #endif /* HAVE_GSSAPI && USE_SPNEGO */