source: UsbWattMeter/trunk/curl-7.47.1/lib/krb5.c

Last change on this file was 167, checked in by coas-nagasima, 8 years ago

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1/* GSSAPI/krb5 support for FTP - loosely based on old krb4.c
2 *
3 * Copyright (c) 1995, 1996, 1997, 1998, 1999 Kungliga Tekniska Högskolan
4 * (Royal Institute of Technology, Stockholm, Sweden).
5 * Copyright (c) 2004 - 2015 Daniel Stenberg
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE. */
34
35#include "curl_setup.h"
36
37#if defined(HAVE_GSSAPI) && !defined(CURL_DISABLE_FTP)
38
39#ifdef HAVE_NETDB_H
40#include <netdb.h>
41#endif
42
43#include "urldata.h"
44#include "curl_base64.h"
45#include "ftp.h"
46#include "curl_gssapi.h"
47#include "sendf.h"
48#include "curl_sec.h"
49#include "warnless.h"
50#include "curl_printf.h"
51
52/* The last #include files should be: */
53#include "curl_memory.h"
54#include "memdebug.h"
55
56#define LOCAL_ADDR (&conn->local_addr)
57#define REMOTE_ADDR conn->ip_addr->ai_addr
58
59static int
60krb5_init(void *app_data)
61{
62 gss_ctx_id_t *context = app_data;
63 /* Make sure our context is initialized for krb5_end. */
64 *context = GSS_C_NO_CONTEXT;
65 return 0;
66}
67
68static int
69krb5_check_prot(void *app_data, int level)
70{
71 (void)app_data; /* unused */
72 if(level == PROT_CONFIDENTIAL)
73 return -1;
74 return 0;
75}
76
77static int
78krb5_decode(void *app_data, void *buf, int len,
79 int level UNUSED_PARAM,
80 struct connectdata *conn UNUSED_PARAM)
81{
82 gss_ctx_id_t *context = app_data;
83 OM_uint32 maj, min;
84 gss_buffer_desc enc, dec;
85
86 (void)level;
87 (void)conn;
88
89 enc.value = buf;
90 enc.length = len;
91 maj = gss_unseal(&min, *context, &enc, &dec, NULL, NULL);
92 if(maj != GSS_S_COMPLETE) {
93 if(len >= 4)
94 strcpy(buf, "599 ");
95 return -1;
96 }
97
98 memcpy(buf, dec.value, dec.length);
99 len = curlx_uztosi(dec.length);
100 gss_release_buffer(&min, &dec);
101
102 return len;
103}
104
105static int
106krb5_overhead(void *app_data, int level, int len)
107{
108 /* no arguments are used */
109 (void)app_data;
110 (void)level;
111 (void)len;
112 return 0;
113}
114
115static int
116krb5_encode(void *app_data, const void *from, int length, int level, void **to)
117{
118 gss_ctx_id_t *context = app_data;
119 gss_buffer_desc dec, enc;
120 OM_uint32 maj, min;
121 int state;
122 int len;
123
124 /* NOTE that the cast is safe, neither of the krb5, gnu gss and heimdal
125 * libraries modify the input buffer in gss_seal()
126 */
127 dec.value = (void*)from;
128 dec.length = length;
129 maj = gss_seal(&min, *context,
130 level == PROT_PRIVATE,
131 GSS_C_QOP_DEFAULT,
132 &dec, &state, &enc);
133
134 if(maj != GSS_S_COMPLETE)
135 return -1;
136
137 /* malloc a new buffer, in case gss_release_buffer doesn't work as
138 expected */
139 *to = malloc(enc.length);
140 if(!*to)
141 return -1;
142 memcpy(*to, enc.value, enc.length);
143 len = curlx_uztosi(enc.length);
144 gss_release_buffer(&min, &enc);
145 return len;
146}
147
148static int
149krb5_auth(void *app_data, struct connectdata *conn)
150{
151 int ret = AUTH_OK;
152 char *p;
153 const char *host = conn->host.name;
154 ssize_t nread;
155 curl_socklen_t l = sizeof(conn->local_addr);
156 struct SessionHandle *data = conn->data;
157 CURLcode result;
158 const char *service = "ftp", *srv_host = "host";
159 gss_buffer_desc input_buffer, output_buffer, _gssresp, *gssresp;
160 OM_uint32 maj, min;
161 gss_name_t gssname;
162 gss_ctx_id_t *context = app_data;
163 struct gss_channel_bindings_struct chan;
164 size_t base64_sz = 0;
165
166 if(getsockname(conn->sock[FIRSTSOCKET],
167 (struct sockaddr *)LOCAL_ADDR, &l) < 0)
168 perror("getsockname()");
169
170 chan.initiator_addrtype = GSS_C_AF_INET;
171 chan.initiator_address.length = l - 4;
172 chan.initiator_address.value =
173 &((struct sockaddr_in *)LOCAL_ADDR)->sin_addr.s_addr;
174 chan.acceptor_addrtype = GSS_C_AF_INET;
175 chan.acceptor_address.length = l - 4;
176 chan.acceptor_address.value =
177 &((struct sockaddr_in *)REMOTE_ADDR)->sin_addr.s_addr;
178 chan.application_data.length = 0;
179 chan.application_data.value = NULL;
180
181 /* this loop will execute twice (once for service, once for host) */
182 for(;;) {
183 /* this really shouldn't be repeated here, but can't help it */
184 if(service == srv_host) {
185 result = Curl_ftpsendf(conn, "AUTH GSSAPI");
186
187 if(result)
188 return -2;
189 if(Curl_GetFTPResponse(&nread, conn, NULL))
190 return -1;
191
192 if(data->state.buffer[0] != '3')
193 return -1;
194 }
195
196 input_buffer.value = data->state.buffer;
197 input_buffer.length = snprintf(input_buffer.value, BUFSIZE, "%s@%s",
198 service, host);
199 maj = gss_import_name(&min, &input_buffer, GSS_C_NT_HOSTBASED_SERVICE,
200 &gssname);
201 if(maj != GSS_S_COMPLETE) {
202 gss_release_name(&min, &gssname);
203 if(service == srv_host) {
204 Curl_failf(data, "Error importing service name %s",
205 input_buffer.value);
206 return AUTH_ERROR;
207 }
208 service = srv_host;
209 continue;
210 }
211 /* We pass NULL as |output_name_type| to avoid a leak. */
212 gss_display_name(&min, gssname, &output_buffer, NULL);
213 Curl_infof(data, "Trying against %s\n", output_buffer.value);
214 gssresp = GSS_C_NO_BUFFER;
215 *context = GSS_C_NO_CONTEXT;
216
217 do {
218 /* Release the buffer at each iteration to avoid leaking: the first time
219 we are releasing the memory from gss_display_name. The last item is
220 taken care by a final gss_release_buffer. */
221 gss_release_buffer(&min, &output_buffer);
222 ret = AUTH_OK;
223 maj = Curl_gss_init_sec_context(data,
224 &min,
225 context,
226 gssname,
227 &Curl_krb5_mech_oid,
228 &chan,
229 gssresp,
230 &output_buffer,
231 TRUE,
232 NULL);
233
234 if(gssresp) {
235 free(_gssresp.value);
236 gssresp = NULL;
237 }
238
239 if(GSS_ERROR(maj)) {
240 Curl_infof(data, "Error creating security context\n");
241 ret = AUTH_ERROR;
242 break;
243 }
244
245 if(output_buffer.length != 0) {
246 result = Curl_base64_encode(data, (char *)output_buffer.value,
247 output_buffer.length, &p, &base64_sz);
248 if(result) {
249 Curl_infof(data, "base64-encoding: %s\n",
250 curl_easy_strerror(result));
251 ret = AUTH_CONTINUE;
252 break;
253 }
254
255 result = Curl_ftpsendf(conn, "ADAT %s", p);
256
257 free(p);
258
259 if(result) {
260 ret = -2;
261 break;
262 }
263
264 if(Curl_GetFTPResponse(&nread, conn, NULL)) {
265 ret = -1;
266 break;
267 }
268
269 if(data->state.buffer[0] != '2' && data->state.buffer[0] != '3') {
270 Curl_infof(data, "Server didn't accept auth data\n");
271 ret = AUTH_ERROR;
272 break;
273 }
274
275 p = data->state.buffer + 4;
276 p = strstr(p, "ADAT=");
277 if(p) {
278 result = Curl_base64_decode(p + 5,
279 (unsigned char **)&_gssresp.value,
280 &_gssresp.length);
281 if(result) {
282 Curl_failf(data, "base64-decoding: %s",
283 curl_easy_strerror(result));
284 ret = AUTH_CONTINUE;
285 break;
286 }
287 }
288
289 gssresp = &_gssresp;
290 }
291 } while(maj == GSS_S_CONTINUE_NEEDED);
292
293 gss_release_name(&min, &gssname);
294 gss_release_buffer(&min, &output_buffer);
295
296 if(gssresp)
297 free(_gssresp.value);
298
299 if(ret == AUTH_OK || service == srv_host)
300 return ret;
301
302 service = srv_host;
303 }
304 return ret;
305}
306
307static void krb5_end(void *app_data)
308{
309 OM_uint32 min;
310 gss_ctx_id_t *context = app_data;
311 if(*context != GSS_C_NO_CONTEXT) {
312#ifdef DEBUGBUILD
313 OM_uint32 maj =
314#endif
315 gss_delete_sec_context(&min, context, GSS_C_NO_BUFFER);
316 DEBUGASSERT(maj == GSS_S_COMPLETE);
317 }
318}
319
320struct Curl_sec_client_mech Curl_krb5_client_mech = {
321 "GSSAPI",
322 sizeof(gss_ctx_id_t),
323 krb5_init,
324 krb5_auth,
325 krb5_end,
326 krb5_check_prot,
327 krb5_overhead,
328 krb5_encode,
329 krb5_decode
330};
331
332#endif /* HAVE_GSSAPI && !CURL_DISABLE_FTP */
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