1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2 /*
3 * Copyright 1994 by OpenVision Technologies, Inc.
4 *
5 * Permission to use, copy, modify, distribute, and sell this software
6 * and its documentation for any purpose is hereby granted without fee,
7 * provided that the above copyright notice appears in all copies and
8 * that both that copyright notice and this permission notice appear in
9 * supporting documentation, and that the name of OpenVision not be used
10 * in advertising or publicity pertaining to distribution of the software
11 * without specific, written prior permission. OpenVision makes no
12 * representations about the suitability of this software for any
13 * purpose. It is provided "as is" without express or implied warranty.
14 *
15 * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
16 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
17 * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
18 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
19 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
20 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
21 * PERFORMANCE OF THIS SOFTWARE.
22 */
23 /*
24 * Copyright (C) 2003, 2004 by the Massachusetts Institute of Technology.
25 * All rights reserved.
26 *
27 * Export of this software from the United States of America may
28 * require a specific license from the United States Government.
29 * It is the responsibility of any person or organization contemplating
30 * export to obtain such a license before exporting.
31 *
32 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
33 * distribute this software and its documentation for any purpose and
34 * without fee is hereby granted, provided that the above copyright
35 * notice appear in all copies and that both that copyright notice and
36 * this permission notice appear in supporting documentation, and that
37 * the name of M.I.T. not be used in advertising or publicity pertaining
38 * to distribution of the software without specific, written prior
39 * permission. Furthermore if you modify this software you must label
40 * your software as modified software and not distribute it in such a
41 * fashion that it might be confused with the original M.I.T. software.
42 * M.I.T. makes no representations about the suitability of
43 * this software for any purpose. It is provided "as is" without express
44 * or implied warranty.
45 */
46
47 #include <autoconf.h>
48
49 #include <stdio.h>
50 #ifdef _WIN32
51 #include <windows.h>
52 #include <winsock.h>
53 #else
54 #include <sys/types.h>
55 #include <netinet/in.h>
56 #include <sys/socket.h>
57 #endif
58 #include <errno.h>
59
60 #ifdef HAVE_UNISTD_H
61 #include <unistd.h>
62 #endif
63 #include <string.h>
64
65 /* need struct timeval */
66 #ifdef HAVE_SYS_TIME_H
67 #include <sys/time.h>
68 #else
69 #include <time.h>
70 #endif
71
72 #include <gssapi/gssapi_generic.h>
73 #include "gss-misc.h"
74
75 #ifdef HAVE_STDLIB_H
76 #include <stdlib.h>
77 #else
78 extern char *malloc();
79 #endif
80
81 FILE *display_file;
82
83 gss_buffer_desc empty_token_buf = { 0, (void *) "" };
84 gss_buffer_t empty_token = &empty_token_buf;
85
86 static void display_status_1(char *m, OM_uint32 code, int type);
87
88 static int
write_all(int fildes,const void * data,unsigned int nbyte)89 write_all(int fildes, const void *data, unsigned int nbyte)
90 {
91 int ret;
92 const char *ptr, *buf = data;
93
94 for (ptr = buf; nbyte; ptr += ret, nbyte -= ret) {
95 ret = send(fildes, ptr, nbyte, 0);
96 if (ret < 0) {
97 if (errno == EINTR)
98 continue;
99 return (ret);
100 } else if (ret == 0) {
101 return (ptr - buf);
102 }
103 }
104
105 return (ptr - buf);
106 }
107
108 static int
read_all(int fildes,void * data,unsigned int nbyte)109 read_all(int fildes, void *data, unsigned int nbyte)
110 {
111 int ret;
112 char *ptr, *buf = data;
113 fd_set rfds;
114 struct timeval tv;
115
116 FD_ZERO(&rfds);
117 FD_SET(fildes, &rfds);
118 tv.tv_sec = 300;
119 tv.tv_usec = 0;
120
121 for (ptr = buf; nbyte; ptr += ret, nbyte -= ret) {
122 if (select(FD_SETSIZE, &rfds, NULL, NULL, &tv) <= 0
123 || !FD_ISSET(fildes, &rfds))
124 return (ptr - buf);
125 ret = recv(fildes, ptr, nbyte, 0);
126 if (ret < 0) {
127 if (errno == EINTR)
128 continue;
129 return (ret);
130 } else if (ret == 0) {
131 return (ptr - buf);
132 }
133 }
134
135 return (ptr - buf);
136 }
137
138 /*
139 * Function: send_token
140 *
141 * Purpose: Writes a token to a file descriptor.
142 *
143 * Arguments:
144 *
145 * s (r) an open file descriptor
146 * flags (r) the flags to write
147 * tok (r) the token to write
148 *
149 * Returns: 0 on success, -1 on failure
150 *
151 * Effects:
152 *
153 * If the flags are non-null, send_token writes the token flags (a
154 * single byte, even though they're passed in in an integer). Next,
155 * the token length (as a network long) and then the token data are
156 * written to the file descriptor s. It returns 0 on success, and -1
157 * if an error occurs or if it could not write all the data.
158 */
159 int
send_token(int s,int flags,gss_buffer_t tok)160 send_token(int s, int flags, gss_buffer_t tok)
161 {
162 int ret;
163 unsigned char char_flags = (unsigned char) flags;
164 unsigned char lenbuf[4];
165
166 if (char_flags) {
167 ret = write_all(s, (char *) &char_flags, 1);
168 if (ret != 1) {
169 perror("sending token flags");
170 return -1;
171 }
172 }
173 if (tok->length > 0xffffffffUL)
174 abort();
175 lenbuf[0] = (tok->length >> 24) & 0xff;
176 lenbuf[1] = (tok->length >> 16) & 0xff;
177 lenbuf[2] = (tok->length >> 8) & 0xff;
178 lenbuf[3] = tok->length & 0xff;
179
180 ret = write_all(s, lenbuf, 4);
181 if (ret < 0) {
182 perror("sending token length");
183 return -1;
184 } else if (ret != 4) {
185 if (display_file)
186 fprintf(display_file,
187 "sending token length: %d of %d bytes written\n", ret, 4);
188 return -1;
189 }
190
191 ret = write_all(s, tok->value, tok->length);
192 if (ret < 0) {
193 perror("sending token data");
194 return -1;
195 } else if ((size_t)ret != tok->length) {
196 if (display_file)
197 fprintf(display_file,
198 "sending token data: %d of %d bytes written\n",
199 ret, (int) tok->length);
200 return -1;
201 }
202
203 return 0;
204 }
205
206 /*
207 * Function: recv_token
208 *
209 * Purpose: Reads a token from a file descriptor.
210 *
211 * Arguments:
212 *
213 * s (r) an open file descriptor
214 * flags (w) the read flags
215 * tok (w) the read token
216 *
217 * Returns: 0 on success, -1 on failure
218 *
219 * Effects:
220 *
221 * recv_token reads the token flags (a single byte, even though
222 * they're stored into an integer, then reads the token length (as a
223 * network long), allocates memory to hold the data, and then reads
224 * the token data from the file descriptor s. It blocks to read the
225 * length and data, if necessary. On a successful return, the token
226 * should be freed with gss_release_buffer. It returns 0 on success,
227 * and -1 if an error occurs or if it could not read all the data.
228 */
229 int
recv_token(int s,int * flags,gss_buffer_t tok)230 recv_token(int s, int *flags, gss_buffer_t tok)
231 {
232 int ret;
233 unsigned char char_flags;
234 unsigned char lenbuf[4];
235
236 ret = read_all(s, (char *) &char_flags, 1);
237 if (ret < 0) {
238 perror("reading token flags");
239 return -1;
240 } else if (!ret) {
241 if (display_file)
242 fputs("reading token flags: 0 bytes read\n", display_file);
243 return -1;
244 } else {
245 *flags = (int) char_flags;
246 }
247
248 if (char_flags == 0) {
249 lenbuf[0] = 0;
250 ret = read_all(s, &lenbuf[1], 3);
251 if (ret < 0) {
252 perror("reading token length");
253 return -1;
254 } else if (ret != 3) {
255 if (display_file)
256 fprintf(display_file,
257 "reading token length: %d of %d bytes read\n", ret, 3);
258 return -1;
259 }
260 } else {
261 ret = read_all(s, lenbuf, 4);
262 if (ret < 0) {
263 perror("reading token length");
264 return -1;
265 } else if (ret != 4) {
266 if (display_file)
267 fprintf(display_file,
268 "reading token length: %d of %d bytes read\n", ret, 4);
269 return -1;
270 }
271 }
272
273 tok->length = ((lenbuf[0] << 24)
274 | (lenbuf[1] << 16)
275 | (lenbuf[2] << 8)
276 | lenbuf[3]);
277 tok->value = (char *) malloc(tok->length ? tok->length : 1);
278 if (tok->length && tok->value == NULL) {
279 if (display_file)
280 fprintf(display_file, "Out of memory allocating token data\n");
281 return -1;
282 }
283
284 ret = read_all(s, (char *) tok->value, tok->length);
285 if (ret < 0) {
286 perror("reading token data");
287 free(tok->value);
288 return -1;
289 } else if ((size_t)ret != tok->length) {
290 fprintf(stderr, "sending token data: %d of %d bytes written\n",
291 ret, (int) tok->length);
292 free(tok->value);
293 return -1;
294 }
295
296 return 0;
297 }
298
299 static void
display_status_1(char * m,OM_uint32 code,int type)300 display_status_1(char *m, OM_uint32 code, int type)
301 {
302 OM_uint32 min_stat;
303 gss_buffer_desc msg;
304 OM_uint32 msg_ctx;
305
306 msg_ctx = 0;
307 while (1) {
308 (void) gss_display_status(&min_stat, code, type, GSS_C_NULL_OID,
309 &msg_ctx, &msg);
310 if (display_file)
311 fprintf(display_file, "GSS-API error %s: %s\n", m,
312 (char *) msg.value);
313 (void) gss_release_buffer(&min_stat, &msg);
314
315 if (!msg_ctx)
316 break;
317 }
318 }
319
320 /*
321 * Function: display_status
322 *
323 * Purpose: displays GSS-API messages
324 *
325 * Arguments:
326 *
327 * msg a string to be displayed with the message
328 * maj_stat the GSS-API major status code
329 * min_stat the GSS-API minor status code
330 *
331 * Effects:
332 *
333 * The GSS-API messages associated with maj_stat and min_stat are
334 * displayed on stderr, each preceded by "GSS-API error <msg>: " and
335 * followed by a newline.
336 */
337 void
display_status(char * msg,OM_uint32 maj_stat,OM_uint32 min_stat)338 display_status(char *msg, OM_uint32 maj_stat, OM_uint32 min_stat)
339 {
340 display_status_1(msg, maj_stat, GSS_C_GSS_CODE);
341 display_status_1(msg, min_stat, GSS_C_MECH_CODE);
342 }
343
344 /*
345 * Function: display_ctx_flags
346 *
347 * Purpose: displays the flags returned by context initiation in
348 * a human-readable form
349 *
350 * Arguments:
351 *
352 * int ret_flags
353 *
354 * Effects:
355 *
356 * Strings corresponding to the context flags are printed on
357 * stdout, preceded by "context flag: " and followed by a newline
358 */
359
360 void
display_ctx_flags(OM_uint32 flags)361 display_ctx_flags(OM_uint32 flags)
362 {
363 if (flags & GSS_C_DELEG_FLAG)
364 fprintf(display_file, "context flag: GSS_C_DELEG_FLAG\n");
365 if (flags & GSS_C_MUTUAL_FLAG)
366 fprintf(display_file, "context flag: GSS_C_MUTUAL_FLAG\n");
367 if (flags & GSS_C_REPLAY_FLAG)
368 fprintf(display_file, "context flag: GSS_C_REPLAY_FLAG\n");
369 if (flags & GSS_C_SEQUENCE_FLAG)
370 fprintf(display_file, "context flag: GSS_C_SEQUENCE_FLAG\n");
371 if (flags & GSS_C_CONF_FLAG)
372 fprintf(display_file, "context flag: GSS_C_CONF_FLAG \n");
373 if (flags & GSS_C_INTEG_FLAG)
374 fprintf(display_file, "context flag: GSS_C_INTEG_FLAG \n");
375 }
376
377 void
print_token(gss_buffer_t tok)378 print_token(gss_buffer_t tok)
379 {
380 unsigned int i;
381 unsigned char *p = tok->value;
382
383 if (!display_file)
384 return;
385 for (i = 0; i < tok->length; i++, p++) {
386 fprintf(display_file, "%02x ", *p);
387 if ((i % 16) == 15) {
388 fprintf(display_file, "\n");
389 }
390 }
391 fprintf(display_file, "\n");
392 fflush(display_file);
393 }
394
395 #ifdef _WIN32
396 #include <sys\timeb.h>
397 #include <time.h>
398
399 int
gettimeofday(struct timeval * tv,void * ignore_tz)400 gettimeofday(struct timeval *tv, void *ignore_tz)
401 {
402 struct _timeb tb;
403 _tzset();
404 _ftime(&tb);
405 if (tv) {
406 tv->tv_sec = tb.time;
407 tv->tv_usec = tb.millitm * 1000;
408 }
409 return 0;
410 }
411 #endif /* _WIN32 */
412