1 /*
2 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Portions Copyright (c) 2009 Apple Inc. 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
36 #include "krb5_locl.h"
37
38 typedef struct krb5_fcache{
39 char *filename;
40 int version;
41 }krb5_fcache;
42
43 struct fcc_cursor {
44 int fd;
45 krb5_storage *sp;
46 };
47
48 #define KRB5_FCC_FVNO_1 1
49 #define KRB5_FCC_FVNO_2 2
50 #define KRB5_FCC_FVNO_3 3
51 #define KRB5_FCC_FVNO_4 4
52
53 #define FCC_TAG_DELTATIME 1
54
55 #define FCACHE(X) ((krb5_fcache*)(X)->data.data)
56
57 #define FILENAME(X) (FCACHE(X)->filename)
58
59 #define FCC_CURSOR(C) ((struct fcc_cursor*)(C))
60
61 static const char* KRB5_CALLCONV
fcc_get_name(krb5_context context,krb5_ccache id)62 fcc_get_name(krb5_context context,
63 krb5_ccache id)
64 {
65 if (FCACHE(id) == NULL)
66 return NULL;
67
68 return FILENAME(id);
69 }
70
71 int
_krb5_xlock(krb5_context context,int fd,krb5_boolean exclusive,const char * filename)72 _krb5_xlock(krb5_context context, int fd, krb5_boolean exclusive,
73 const char *filename)
74 {
75 int ret;
76 #ifdef HAVE_FCNTL
77 struct flock l;
78
79 l.l_start = 0;
80 l.l_len = 0;
81 l.l_type = exclusive ? F_WRLCK : F_RDLCK;
82 l.l_whence = SEEK_SET;
83 ret = fcntl(fd, F_SETLKW, &l);
84 #else
85 ret = flock(fd, exclusive ? LOCK_EX : LOCK_SH);
86 #endif
87 if(ret < 0)
88 ret = errno;
89 if(ret == EACCES) /* fcntl can return EACCES instead of EAGAIN */
90 ret = EAGAIN;
91
92 switch (ret) {
93 case 0:
94 break;
95 case EINVAL: /* filesystem doesn't support locking, let the user have it */
96 ret = 0;
97 break;
98 case EAGAIN:
99 krb5_set_error_message(context, ret,
100 N_("timed out locking cache file %s", "file"),
101 filename);
102 break;
103 default: {
104 char buf[128];
105 rk_strerror_r(ret, buf, sizeof(buf));
106 krb5_set_error_message(context, ret,
107 N_("error locking cache file %s: %s",
108 "file, error"), filename, buf);
109 break;
110 }
111 }
112 return ret;
113 }
114
115 int
_krb5_xunlock(krb5_context context,int fd)116 _krb5_xunlock(krb5_context context, int fd)
117 {
118 int ret;
119 #ifdef HAVE_FCNTL
120 struct flock l;
121 l.l_start = 0;
122 l.l_len = 0;
123 l.l_type = F_UNLCK;
124 l.l_whence = SEEK_SET;
125 ret = fcntl(fd, F_SETLKW, &l);
126 #else
127 ret = flock(fd, LOCK_UN);
128 #endif
129 if (ret < 0)
130 ret = errno;
131 switch (ret) {
132 case 0:
133 break;
134 case EINVAL: /* filesystem doesn't support locking, let the user have it */
135 ret = 0;
136 break;
137 default: {
138 char buf[128];
139 rk_strerror_r(ret, buf, sizeof(buf));
140 krb5_set_error_message(context, ret,
141 N_("Failed to unlock file: %s", ""), buf);
142 break;
143 }
144 }
145 return ret;
146 }
147
148 static krb5_error_code
write_storage(krb5_context context,krb5_storage * sp,int fd)149 write_storage(krb5_context context, krb5_storage *sp, int fd)
150 {
151 krb5_error_code ret;
152 krb5_data data;
153 ssize_t sret;
154
155 ret = krb5_storage_to_data(sp, &data);
156 if (ret) {
157 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
158 return ret;
159 }
160 sret = write(fd, data.data, data.length);
161 ret = (sret != (ssize_t)data.length);
162 krb5_data_free(&data);
163 if (ret) {
164 ret = errno;
165 krb5_set_error_message(context, ret,
166 N_("Failed to write FILE credential data", ""));
167 return ret;
168 }
169 return 0;
170 }
171
172
173 static krb5_error_code KRB5_CALLCONV
fcc_lock(krb5_context context,krb5_ccache id,int fd,krb5_boolean exclusive)174 fcc_lock(krb5_context context, krb5_ccache id,
175 int fd, krb5_boolean exclusive)
176 {
177 return _krb5_xlock(context, fd, exclusive, fcc_get_name(context, id));
178 }
179
180 static krb5_error_code KRB5_CALLCONV
fcc_unlock(krb5_context context,int fd)181 fcc_unlock(krb5_context context, int fd)
182 {
183 return _krb5_xunlock(context, fd);
184 }
185
186 static krb5_error_code KRB5_CALLCONV
fcc_resolve(krb5_context context,krb5_ccache * id,const char * res)187 fcc_resolve(krb5_context context, krb5_ccache *id, const char *res)
188 {
189 krb5_fcache *f;
190 f = malloc(sizeof(*f));
191 if(f == NULL) {
192 krb5_set_error_message(context, KRB5_CC_NOMEM,
193 N_("malloc: out of memory", ""));
194 return KRB5_CC_NOMEM;
195 }
196 f->filename = strdup(res);
197 if(f->filename == NULL){
198 free(f);
199 krb5_set_error_message(context, KRB5_CC_NOMEM,
200 N_("malloc: out of memory", ""));
201 return KRB5_CC_NOMEM;
202 }
203 f->version = 0;
204 (*id)->data.data = f;
205 (*id)->data.length = sizeof(*f);
206 return 0;
207 }
208
209 /*
210 * Try to scrub the contents of `filename' safely.
211 */
212
213 static int
scrub_file(int fd)214 scrub_file (int fd)
215 {
216 off_t pos;
217 char buf[128];
218
219 pos = lseek(fd, 0, SEEK_END);
220 if (pos < 0)
221 return errno;
222 if (lseek(fd, 0, SEEK_SET) < 0)
223 return errno;
224 memset(buf, 0, sizeof(buf));
225 while(pos > 0) {
226 ssize_t tmp = write(fd, buf, min((off_t)sizeof(buf), pos));
227
228 if (tmp < 0)
229 return errno;
230 pos -= tmp;
231 }
232 #ifdef _MSC_VER
233 _commit (fd);
234 #else
235 fsync (fd);
236 #endif
237 return 0;
238 }
239
240 /*
241 * Erase `filename' if it exists, trying to remove the contents if
242 * it's `safe'. We always try to remove the file, it it exists. It's
243 * only overwritten if it's a regular file (not a symlink and not a
244 * hardlink)
245 */
246
247 krb5_error_code
_krb5_erase_file(krb5_context context,const char * filename)248 _krb5_erase_file(krb5_context context, const char *filename)
249 {
250 int fd;
251 struct stat sb1, sb2;
252 int ret;
253
254 ret = lstat (filename, &sb1);
255 if (ret < 0)
256 return errno;
257
258 fd = open(filename, O_RDWR | O_BINARY);
259 if(fd < 0) {
260 if(errno == ENOENT)
261 return 0;
262 else
263 return errno;
264 }
265 rk_cloexec(fd);
266 ret = _krb5_xlock(context, fd, 1, filename);
267 if (ret) {
268 close(fd);
269 return ret;
270 }
271 if (unlink(filename) < 0) {
272 _krb5_xunlock(context, fd);
273 close (fd);
274 return errno;
275 }
276 ret = fstat (fd, &sb2);
277 if (ret < 0) {
278 _krb5_xunlock(context, fd);
279 close (fd);
280 return errno;
281 }
282
283 /* check if someone was playing with symlinks */
284
285 if (sb1.st_dev != sb2.st_dev || sb1.st_ino != sb2.st_ino) {
286 _krb5_xunlock(context, fd);
287 close (fd);
288 return EPERM;
289 }
290
291 /* there are still hard links to this file */
292
293 if (sb2.st_nlink != 0) {
294 _krb5_xunlock(context, fd);
295 close (fd);
296 return 0;
297 }
298
299 ret = scrub_file (fd);
300 if (ret) {
301 _krb5_xunlock(context, fd);
302 close(fd);
303 return ret;
304 }
305 ret = _krb5_xunlock(context, fd);
306 close (fd);
307 return ret;
308 }
309
310 static krb5_error_code KRB5_CALLCONV
fcc_gen_new(krb5_context context,krb5_ccache * id)311 fcc_gen_new(krb5_context context, krb5_ccache *id)
312 {
313 char *file = NULL, *exp_file = NULL;
314 krb5_error_code ret;
315 krb5_fcache *f;
316 int fd;
317
318 f = malloc(sizeof(*f));
319 if(f == NULL) {
320 krb5_set_error_message(context, KRB5_CC_NOMEM,
321 N_("malloc: out of memory", ""));
322 return KRB5_CC_NOMEM;
323 }
324 ret = asprintf (&file, "%sXXXXXX", KRB5_DEFAULT_CCFILE_ROOT);
325 if(ret < 0 || file == NULL) {
326 free(f);
327 krb5_set_error_message(context, KRB5_CC_NOMEM,
328 N_("malloc: out of memory", ""));
329 return KRB5_CC_NOMEM;
330 }
331 ret = _krb5_expand_path_tokens(context, file, &exp_file);
332 free(file);
333 if (ret)
334 return ret;
335
336 file = exp_file;
337
338 fd = mkstemp(exp_file);
339 if(fd < 0) {
340 int xret = errno;
341 krb5_set_error_message(context, xret, N_("mkstemp %s failed", ""), exp_file);
342 free(f);
343 free(exp_file);
344 return xret;
345 }
346 close(fd);
347 f->filename = exp_file;
348 f->version = 0;
349 (*id)->data.data = f;
350 (*id)->data.length = sizeof(*f);
351 return 0;
352 }
353
354 static void
storage_set_flags(krb5_context context,krb5_storage * sp,int vno)355 storage_set_flags(krb5_context context, krb5_storage *sp, int vno)
356 {
357 int flags = 0;
358 switch(vno) {
359 case KRB5_FCC_FVNO_1:
360 flags |= KRB5_STORAGE_PRINCIPAL_WRONG_NUM_COMPONENTS;
361 flags |= KRB5_STORAGE_PRINCIPAL_NO_NAME_TYPE;
362 flags |= KRB5_STORAGE_HOST_BYTEORDER;
363 break;
364 case KRB5_FCC_FVNO_2:
365 flags |= KRB5_STORAGE_HOST_BYTEORDER;
366 break;
367 case KRB5_FCC_FVNO_3:
368 flags |= KRB5_STORAGE_KEYBLOCK_KEYTYPE_TWICE;
369 break;
370 case KRB5_FCC_FVNO_4:
371 break;
372 default:
373 krb5_abortx(context,
374 "storage_set_flags called with bad vno (%x)", vno);
375 }
376 krb5_storage_set_flags(sp, flags);
377 }
378
379 static krb5_error_code KRB5_CALLCONV
fcc_open(krb5_context context,krb5_ccache id,int * fd_ret,int flags,mode_t mode)380 fcc_open(krb5_context context,
381 krb5_ccache id,
382 int *fd_ret,
383 int flags,
384 mode_t mode)
385 {
386 krb5_boolean exclusive = ((flags | O_WRONLY) == flags ||
387 (flags | O_RDWR) == flags);
388 krb5_error_code ret;
389 const char *filename;
390 int fd;
391
392 if (FCACHE(id) == NULL)
393 return krb5_einval(context, 2);
394
395 filename = FILENAME(id);
396
397 fd = open(filename, flags, mode);
398 if(fd < 0) {
399 char buf[128];
400 ret = errno;
401 rk_strerror_r(ret, buf, sizeof(buf));
402 krb5_set_error_message(context, ret, N_("open(%s): %s", "file, error"),
403 filename, buf);
404 return ret;
405 }
406 rk_cloexec(fd);
407
408 if((ret = fcc_lock(context, id, fd, exclusive)) != 0) {
409 close(fd);
410 return ret;
411 }
412 *fd_ret = fd;
413 return 0;
414 }
415
416 static krb5_error_code KRB5_CALLCONV
fcc_initialize(krb5_context context,krb5_ccache id,krb5_principal primary_principal)417 fcc_initialize(krb5_context context,
418 krb5_ccache id,
419 krb5_principal primary_principal)
420 {
421 krb5_fcache *f = FCACHE(id);
422 int ret = 0;
423 int fd;
424
425 if (f == NULL)
426 return krb5_einval(context, 2);
427
428 unlink (f->filename);
429
430 ret = fcc_open(context, id, &fd, O_RDWR | O_CREAT | O_EXCL | O_BINARY | O_CLOEXEC, 0600);
431 if(ret)
432 return ret;
433 {
434 krb5_storage *sp;
435 sp = krb5_storage_emem();
436 krb5_storage_set_eof_code(sp, KRB5_CC_END);
437 if(context->fcache_vno != 0)
438 f->version = context->fcache_vno;
439 else
440 f->version = KRB5_FCC_FVNO_4;
441 ret |= krb5_store_int8(sp, 5);
442 ret |= krb5_store_int8(sp, f->version);
443 storage_set_flags(context, sp, f->version);
444 if(f->version == KRB5_FCC_FVNO_4 && ret == 0) {
445 /* V4 stuff */
446 if (context->kdc_sec_offset) {
447 ret |= krb5_store_int16 (sp, 12); /* length */
448 ret |= krb5_store_int16 (sp, FCC_TAG_DELTATIME); /* Tag */
449 ret |= krb5_store_int16 (sp, 8); /* length of data */
450 ret |= krb5_store_int32 (sp, context->kdc_sec_offset);
451 ret |= krb5_store_int32 (sp, context->kdc_usec_offset);
452 } else {
453 ret |= krb5_store_int16 (sp, 0);
454 }
455 }
456 ret |= krb5_store_principal(sp, primary_principal);
457
458 ret |= write_storage(context, sp, fd);
459
460 krb5_storage_free(sp);
461 }
462 fcc_unlock(context, fd);
463 if (close(fd) < 0)
464 if (ret == 0) {
465 char buf[128];
466 ret = errno;
467 rk_strerror_r(ret, buf, sizeof(buf));
468 krb5_set_error_message (context, ret, N_("close %s: %s", ""),
469 FILENAME(id), buf);
470 }
471 return ret;
472 }
473
474 static krb5_error_code KRB5_CALLCONV
fcc_close(krb5_context context,krb5_ccache id)475 fcc_close(krb5_context context,
476 krb5_ccache id)
477 {
478 if (FCACHE(id) == NULL)
479 return krb5_einval(context, 2);
480
481 free (FILENAME(id));
482 krb5_data_free(&id->data);
483 return 0;
484 }
485
486 static krb5_error_code KRB5_CALLCONV
fcc_destroy(krb5_context context,krb5_ccache id)487 fcc_destroy(krb5_context context,
488 krb5_ccache id)
489 {
490 if (FCACHE(id) == NULL)
491 return krb5_einval(context, 2);
492
493 _krb5_erase_file(context, FILENAME(id));
494 return 0;
495 }
496
497 static krb5_error_code KRB5_CALLCONV
fcc_store_cred(krb5_context context,krb5_ccache id,krb5_creds * creds)498 fcc_store_cred(krb5_context context,
499 krb5_ccache id,
500 krb5_creds *creds)
501 {
502 int ret;
503 int fd;
504
505 ret = fcc_open(context, id, &fd, O_WRONLY | O_APPEND | O_BINARY | O_CLOEXEC, 0);
506 if(ret)
507 return ret;
508 {
509 krb5_storage *sp;
510
511 sp = krb5_storage_emem();
512 krb5_storage_set_eof_code(sp, KRB5_CC_END);
513 storage_set_flags(context, sp, FCACHE(id)->version);
514 if (!krb5_config_get_bool_default(context, NULL, TRUE,
515 "libdefaults",
516 "fcc-mit-ticketflags",
517 NULL))
518 krb5_storage_set_flags(sp, KRB5_STORAGE_CREDS_FLAGS_WRONG_BITORDER);
519 ret = krb5_store_creds(sp, creds);
520 if (ret == 0)
521 ret = write_storage(context, sp, fd);
522 krb5_storage_free(sp);
523 }
524 fcc_unlock(context, fd);
525 if (close(fd) < 0) {
526 if (ret == 0) {
527 char buf[128];
528 rk_strerror_r(ret, buf, sizeof(buf));
529 ret = errno;
530 krb5_set_error_message (context, ret, N_("close %s: %s", ""),
531 FILENAME(id), buf);
532 }
533 }
534 return ret;
535 }
536
537 static krb5_error_code
init_fcc(krb5_context context,krb5_ccache id,krb5_storage ** ret_sp,int * ret_fd,krb5_deltat * kdc_offset)538 init_fcc (krb5_context context,
539 krb5_ccache id,
540 krb5_storage **ret_sp,
541 int *ret_fd,
542 krb5_deltat *kdc_offset)
543 {
544 int fd;
545 int8_t pvno, tag;
546 krb5_storage *sp;
547 krb5_error_code ret;
548
549 if (kdc_offset)
550 *kdc_offset = 0;
551
552 ret = fcc_open(context, id, &fd, O_RDONLY | O_BINARY | O_CLOEXEC, 0);
553 if(ret)
554 return ret;
555
556 sp = krb5_storage_from_fd(fd);
557 if(sp == NULL) {
558 krb5_clear_error_message(context);
559 ret = ENOMEM;
560 goto out;
561 }
562 krb5_storage_set_eof_code(sp, KRB5_CC_END);
563 ret = krb5_ret_int8(sp, &pvno);
564 if(ret != 0) {
565 if(ret == KRB5_CC_END) {
566 ret = ENOENT;
567 krb5_set_error_message(context, ret,
568 N_("Empty credential cache file: %s", ""),
569 FILENAME(id));
570 } else
571 krb5_set_error_message(context, ret, N_("Error reading pvno "
572 "in cache file: %s", ""),
573 FILENAME(id));
574 goto out;
575 }
576 if(pvno != 5) {
577 ret = KRB5_CCACHE_BADVNO;
578 krb5_set_error_message(context, ret, N_("Bad version number in credential "
579 "cache file: %s", ""),
580 FILENAME(id));
581 goto out;
582 }
583 ret = krb5_ret_int8(sp, &tag); /* should not be host byte order */
584 if(ret != 0) {
585 ret = KRB5_CC_FORMAT;
586 krb5_set_error_message(context, ret, "Error reading tag in "
587 "cache file: %s", FILENAME(id));
588 goto out;
589 }
590 FCACHE(id)->version = tag;
591 storage_set_flags(context, sp, FCACHE(id)->version);
592 switch (tag) {
593 case KRB5_FCC_FVNO_4: {
594 int16_t length;
595
596 ret = krb5_ret_int16 (sp, &length);
597 if(ret) {
598 ret = KRB5_CC_FORMAT;
599 krb5_set_error_message(context, ret,
600 N_("Error reading tag length in "
601 "cache file: %s", ""), FILENAME(id));
602 goto out;
603 }
604 while(length > 0) {
605 int16_t dtag, data_len;
606 int i;
607 int8_t dummy;
608
609 ret = krb5_ret_int16 (sp, &dtag);
610 if(ret) {
611 ret = KRB5_CC_FORMAT;
612 krb5_set_error_message(context, ret, N_("Error reading dtag in "
613 "cache file: %s", ""),
614 FILENAME(id));
615 goto out;
616 }
617 ret = krb5_ret_int16 (sp, &data_len);
618 if(ret) {
619 ret = KRB5_CC_FORMAT;
620 krb5_set_error_message(context, ret,
621 N_("Error reading dlength "
622 "in cache file: %s",""),
623 FILENAME(id));
624 goto out;
625 }
626 switch (dtag) {
627 case FCC_TAG_DELTATIME : {
628 int32_t offset;
629
630 ret = krb5_ret_int32 (sp, &offset);
631 ret |= krb5_ret_int32 (sp, &context->kdc_usec_offset);
632 if(ret) {
633 ret = KRB5_CC_FORMAT;
634 krb5_set_error_message(context, ret,
635 N_("Error reading kdc_sec in "
636 "cache file: %s", ""),
637 FILENAME(id));
638 goto out;
639 }
640 context->kdc_sec_offset = offset;
641 if (kdc_offset)
642 *kdc_offset = offset;
643 break;
644 }
645 default :
646 for (i = 0; i < data_len; ++i) {
647 ret = krb5_ret_int8 (sp, &dummy);
648 if(ret) {
649 ret = KRB5_CC_FORMAT;
650 krb5_set_error_message(context, ret,
651 N_("Error reading unknown "
652 "tag in cache file: %s", ""),
653 FILENAME(id));
654 goto out;
655 }
656 }
657 break;
658 }
659 length -= 4 + data_len;
660 }
661 break;
662 }
663 case KRB5_FCC_FVNO_3:
664 case KRB5_FCC_FVNO_2:
665 case KRB5_FCC_FVNO_1:
666 break;
667 default :
668 ret = KRB5_CCACHE_BADVNO;
669 krb5_set_error_message(context, ret,
670 N_("Unknown version number (%d) in "
671 "credential cache file: %s", ""),
672 (int)tag, FILENAME(id));
673 goto out;
674 }
675 *ret_sp = sp;
676 *ret_fd = fd;
677
678 return 0;
679 out:
680 if(sp != NULL)
681 krb5_storage_free(sp);
682 fcc_unlock(context, fd);
683 close(fd);
684 return ret;
685 }
686
687 static krb5_error_code KRB5_CALLCONV
fcc_get_principal(krb5_context context,krb5_ccache id,krb5_principal * principal)688 fcc_get_principal(krb5_context context,
689 krb5_ccache id,
690 krb5_principal *principal)
691 {
692 krb5_error_code ret;
693 int fd;
694 krb5_storage *sp;
695
696 ret = init_fcc (context, id, &sp, &fd, NULL);
697 if (ret)
698 return ret;
699 ret = krb5_ret_principal(sp, principal);
700 if (ret)
701 krb5_clear_error_message(context);
702 krb5_storage_free(sp);
703 fcc_unlock(context, fd);
704 close(fd);
705 return ret;
706 }
707
708 static krb5_error_code KRB5_CALLCONV
709 fcc_end_get (krb5_context context,
710 krb5_ccache id,
711 krb5_cc_cursor *cursor);
712
713 static krb5_error_code KRB5_CALLCONV
fcc_get_first(krb5_context context,krb5_ccache id,krb5_cc_cursor * cursor)714 fcc_get_first (krb5_context context,
715 krb5_ccache id,
716 krb5_cc_cursor *cursor)
717 {
718 krb5_error_code ret;
719 krb5_principal principal;
720
721 if (FCACHE(id) == NULL)
722 return krb5_einval(context, 2);
723
724 *cursor = malloc(sizeof(struct fcc_cursor));
725 if (*cursor == NULL) {
726 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
727 return ENOMEM;
728 }
729 memset(*cursor, 0, sizeof(struct fcc_cursor));
730
731 ret = init_fcc (context, id, &FCC_CURSOR(*cursor)->sp,
732 &FCC_CURSOR(*cursor)->fd, NULL);
733 if (ret) {
734 free(*cursor);
735 *cursor = NULL;
736 return ret;
737 }
738 ret = krb5_ret_principal (FCC_CURSOR(*cursor)->sp, &principal);
739 if(ret) {
740 krb5_clear_error_message(context);
741 fcc_end_get(context, id, cursor);
742 return ret;
743 }
744 krb5_free_principal (context, principal);
745 fcc_unlock(context, FCC_CURSOR(*cursor)->fd);
746 return 0;
747 }
748
749 static krb5_error_code KRB5_CALLCONV
fcc_get_next(krb5_context context,krb5_ccache id,krb5_cc_cursor * cursor,krb5_creds * creds)750 fcc_get_next (krb5_context context,
751 krb5_ccache id,
752 krb5_cc_cursor *cursor,
753 krb5_creds *creds)
754 {
755 krb5_error_code ret;
756
757 if (FCACHE(id) == NULL)
758 return krb5_einval(context, 2);
759
760 if (FCC_CURSOR(*cursor) == NULL)
761 return krb5_einval(context, 3);
762
763 if((ret = fcc_lock(context, id, FCC_CURSOR(*cursor)->fd, FALSE)) != 0)
764 return ret;
765
766 ret = krb5_ret_creds(FCC_CURSOR(*cursor)->sp, creds);
767 if (ret)
768 krb5_clear_error_message(context);
769
770 fcc_unlock(context, FCC_CURSOR(*cursor)->fd);
771 return ret;
772 }
773
774 static krb5_error_code KRB5_CALLCONV
fcc_end_get(krb5_context context,krb5_ccache id,krb5_cc_cursor * cursor)775 fcc_end_get (krb5_context context,
776 krb5_ccache id,
777 krb5_cc_cursor *cursor)
778 {
779
780 if (FCACHE(id) == NULL)
781 return krb5_einval(context, 2);
782
783 if (FCC_CURSOR(*cursor) == NULL)
784 return krb5_einval(context, 3);
785
786 krb5_storage_free(FCC_CURSOR(*cursor)->sp);
787 close (FCC_CURSOR(*cursor)->fd);
788 free(*cursor);
789 *cursor = NULL;
790 return 0;
791 }
792
793 static krb5_error_code KRB5_CALLCONV
fcc_remove_cred(krb5_context context,krb5_ccache id,krb5_flags which,krb5_creds * cred)794 fcc_remove_cred(krb5_context context,
795 krb5_ccache id,
796 krb5_flags which,
797 krb5_creds *cred)
798 {
799 krb5_error_code ret;
800 krb5_ccache copy, newfile;
801 char *newname = NULL;
802 int fd;
803
804 if (FCACHE(id) == NULL)
805 return krb5_einval(context, 2);
806
807 ret = krb5_cc_new_unique(context, krb5_cc_type_memory, NULL, ©);
808 if (ret)
809 return ret;
810
811 ret = krb5_cc_copy_cache(context, id, copy);
812 if (ret) {
813 krb5_cc_destroy(context, copy);
814 return ret;
815 }
816
817 ret = krb5_cc_remove_cred(context, copy, which, cred);
818 if (ret) {
819 krb5_cc_destroy(context, copy);
820 return ret;
821 }
822
823 ret = asprintf(&newname, "FILE:%s.XXXXXX", FILENAME(id));
824 if (ret < 0 || newname == NULL) {
825 krb5_cc_destroy(context, copy);
826 return ENOMEM;
827 }
828
829 fd = mkstemp(&newname[5]);
830 if (fd < 0) {
831 ret = errno;
832 krb5_cc_destroy(context, copy);
833 return ret;
834 }
835 close(fd);
836
837 ret = krb5_cc_resolve(context, newname, &newfile);
838 if (ret) {
839 unlink(&newname[5]);
840 free(newname);
841 krb5_cc_destroy(context, copy);
842 return ret;
843 }
844
845 ret = krb5_cc_copy_cache(context, copy, newfile);
846 krb5_cc_destroy(context, copy);
847 if (ret) {
848 free(newname);
849 krb5_cc_destroy(context, newfile);
850 return ret;
851 }
852
853 ret = rk_rename(&newname[5], FILENAME(id));
854 if (ret)
855 ret = errno;
856 free(newname);
857 krb5_cc_close(context, newfile);
858
859 return ret;
860 }
861
862 static krb5_error_code KRB5_CALLCONV
fcc_set_flags(krb5_context context,krb5_ccache id,krb5_flags flags)863 fcc_set_flags(krb5_context context,
864 krb5_ccache id,
865 krb5_flags flags)
866 {
867 if (FCACHE(id) == NULL)
868 return krb5_einval(context, 2);
869
870 return 0; /* XXX */
871 }
872
873 static int KRB5_CALLCONV
fcc_get_version(krb5_context context,krb5_ccache id)874 fcc_get_version(krb5_context context,
875 krb5_ccache id)
876 {
877 if (FCACHE(id) == NULL)
878 return -1;
879
880 return FCACHE(id)->version;
881 }
882
883 struct fcache_iter {
884 int first;
885 };
886
887 static krb5_error_code KRB5_CALLCONV
fcc_get_cache_first(krb5_context context,krb5_cc_cursor * cursor)888 fcc_get_cache_first(krb5_context context, krb5_cc_cursor *cursor)
889 {
890 struct fcache_iter *iter;
891
892 iter = calloc(1, sizeof(*iter));
893 if (iter == NULL) {
894 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
895 return ENOMEM;
896 }
897 iter->first = 1;
898 *cursor = iter;
899 return 0;
900 }
901
902 static krb5_error_code KRB5_CALLCONV
fcc_get_cache_next(krb5_context context,krb5_cc_cursor cursor,krb5_ccache * id)903 fcc_get_cache_next(krb5_context context, krb5_cc_cursor cursor, krb5_ccache *id)
904 {
905 struct fcache_iter *iter = cursor;
906 krb5_error_code ret;
907 const char *fn;
908 char *expandedfn = NULL;
909
910 if (iter == NULL)
911 return krb5_einval(context, 2);
912
913 if (!iter->first) {
914 krb5_clear_error_message(context);
915 return KRB5_CC_END;
916 }
917 iter->first = 0;
918
919 fn = krb5_cc_default_name(context);
920 if (fn == NULL || strncasecmp(fn, "FILE:", 5) != 0) {
921 ret = _krb5_expand_default_cc_name(context,
922 KRB5_DEFAULT_CCNAME_FILE,
923 &expandedfn);
924 if (ret)
925 return ret;
926 fn = expandedfn;
927 }
928 /* check if file exists, don't return a non existant "next" */
929 if (strncasecmp(fn, "FILE:", 5) == 0) {
930 struct stat sb;
931 ret = stat(fn + 5, &sb);
932 if (ret) {
933 ret = KRB5_CC_END;
934 goto out;
935 }
936 }
937 ret = krb5_cc_resolve(context, fn, id);
938 out:
939 if (expandedfn)
940 free(expandedfn);
941
942 return ret;
943 }
944
945 static krb5_error_code KRB5_CALLCONV
fcc_end_cache_get(krb5_context context,krb5_cc_cursor cursor)946 fcc_end_cache_get(krb5_context context, krb5_cc_cursor cursor)
947 {
948 struct fcache_iter *iter = cursor;
949
950 if (iter == NULL)
951 return krb5_einval(context, 2);
952
953 free(iter);
954 return 0;
955 }
956
957 static krb5_error_code KRB5_CALLCONV
fcc_move(krb5_context context,krb5_ccache from,krb5_ccache to)958 fcc_move(krb5_context context, krb5_ccache from, krb5_ccache to)
959 {
960 krb5_error_code ret = 0;
961
962 ret = rk_rename(FILENAME(from), FILENAME(to));
963
964 if (ret && errno != EXDEV) {
965 char buf[128];
966 ret = errno;
967 rk_strerror_r(ret, buf, sizeof(buf));
968 krb5_set_error_message(context, ret,
969 N_("Rename of file from %s "
970 "to %s failed: %s", ""),
971 FILENAME(from), FILENAME(to), buf);
972 return ret;
973 } else if (ret && errno == EXDEV) {
974 /* make a copy and delete the orignal */
975 krb5_ssize_t sz1, sz2;
976 int fd1, fd2;
977 char buf[BUFSIZ];
978
979 ret = fcc_open(context, from, &fd1, O_RDONLY | O_BINARY | O_CLOEXEC, 0);
980 if(ret)
981 return ret;
982
983 unlink(FILENAME(to));
984
985 ret = fcc_open(context, to, &fd2,
986 O_WRONLY | O_CREAT | O_EXCL | O_BINARY | O_CLOEXEC, 0600);
987 if(ret)
988 goto out1;
989
990 while((sz1 = read(fd1, buf, sizeof(buf))) > 0) {
991 sz2 = write(fd2, buf, sz1);
992 if (sz1 != sz2) {
993 ret = EIO;
994 krb5_set_error_message(context, ret,
995 N_("Failed to write data from one file "
996 "credential cache to the other", ""));
997 goto out2;
998 }
999 }
1000 if (sz1 < 0) {
1001 ret = EIO;
1002 krb5_set_error_message(context, ret,
1003 N_("Failed to read data from one file "
1004 "credential cache to the other", ""));
1005 goto out2;
1006 }
1007 out2:
1008 fcc_unlock(context, fd2);
1009 close(fd2);
1010
1011 out1:
1012 fcc_unlock(context, fd1);
1013 close(fd1);
1014
1015 _krb5_erase_file(context, FILENAME(from));
1016
1017 if (ret) {
1018 _krb5_erase_file(context, FILENAME(to));
1019 return ret;
1020 }
1021 }
1022
1023 /* make sure ->version is uptodate */
1024 {
1025 krb5_storage *sp;
1026 int fd;
1027 if ((ret = init_fcc (context, to, &sp, &fd, NULL)) == 0) {
1028 if (sp)
1029 krb5_storage_free(sp);
1030 fcc_unlock(context, fd);
1031 close(fd);
1032 }
1033 }
1034
1035 fcc_close(context, from);
1036
1037 return ret;
1038 }
1039
1040 static krb5_error_code KRB5_CALLCONV
fcc_get_default_name(krb5_context context,char ** str)1041 fcc_get_default_name(krb5_context context, char **str)
1042 {
1043 return _krb5_expand_default_cc_name(context,
1044 KRB5_DEFAULT_CCNAME_FILE,
1045 str);
1046 }
1047
1048 static krb5_error_code KRB5_CALLCONV
fcc_lastchange(krb5_context context,krb5_ccache id,krb5_timestamp * mtime)1049 fcc_lastchange(krb5_context context, krb5_ccache id, krb5_timestamp *mtime)
1050 {
1051 krb5_error_code ret;
1052 struct stat sb;
1053 int fd;
1054
1055 ret = fcc_open(context, id, &fd, O_RDONLY | O_BINARY | O_CLOEXEC, 0);
1056 if(ret)
1057 return ret;
1058 ret = fstat(fd, &sb);
1059 close(fd);
1060 if (ret) {
1061 ret = errno;
1062 krb5_set_error_message(context, ret, N_("Failed to stat cache file", ""));
1063 return ret;
1064 }
1065 *mtime = sb.st_mtime;
1066 return 0;
1067 }
1068
1069 static krb5_error_code KRB5_CALLCONV
fcc_set_kdc_offset(krb5_context context,krb5_ccache id,krb5_deltat kdc_offset)1070 fcc_set_kdc_offset(krb5_context context, krb5_ccache id, krb5_deltat kdc_offset)
1071 {
1072 return 0;
1073 }
1074
1075 static krb5_error_code KRB5_CALLCONV
fcc_get_kdc_offset(krb5_context context,krb5_ccache id,krb5_deltat * kdc_offset)1076 fcc_get_kdc_offset(krb5_context context, krb5_ccache id, krb5_deltat *kdc_offset)
1077 {
1078 krb5_error_code ret;
1079 krb5_storage *sp = NULL;
1080 int fd;
1081 ret = init_fcc(context, id, &sp, &fd, kdc_offset);
1082 if (sp)
1083 krb5_storage_free(sp);
1084 fcc_unlock(context, fd);
1085 close(fd);
1086
1087 return ret;
1088 }
1089
1090
1091 /**
1092 * Variable containing the FILE based credential cache implemention.
1093 *
1094 * @ingroup krb5_ccache
1095 */
1096
1097 KRB5_LIB_VARIABLE const krb5_cc_ops krb5_fcc_ops = {
1098 KRB5_CC_OPS_VERSION,
1099 "FILE",
1100 fcc_get_name,
1101 fcc_resolve,
1102 fcc_gen_new,
1103 fcc_initialize,
1104 fcc_destroy,
1105 fcc_close,
1106 fcc_store_cred,
1107 NULL, /* fcc_retrieve */
1108 fcc_get_principal,
1109 fcc_get_first,
1110 fcc_get_next,
1111 fcc_end_get,
1112 fcc_remove_cred,
1113 fcc_set_flags,
1114 fcc_get_version,
1115 fcc_get_cache_first,
1116 fcc_get_cache_next,
1117 fcc_end_cache_get,
1118 fcc_move,
1119 fcc_get_default_name,
1120 NULL,
1121 fcc_lastchange,
1122 fcc_set_kdc_offset,
1123 fcc_get_kdc_offset
1124 };
1125