1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 7 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1997-2018 The PHP Group |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Author: Sascha Schumann <sascha@schumann.cx> |
16 +----------------------------------------------------------------------+
17 */
18
19 /**************************************************************************
20 * Files save handler should be used as reference implementations of session
21 * save handlers. PS_* functions are called as follows with standard usage.
22 *
23 * PS_OPEN_FUNC() - Create module data that manages save handler.
24 * PS_CREATE_SID() and/or PS_VALIDATE_SID()
25 * - PS_CREATE_ID() is called if session ID(key) is not
26 * provided or invalid. PS_VALIDATE_SID() is called to
27 * verify session ID already exists or not to mitigate
28 * session adoption vulnerability risk.
29 * PS_READ_FUNC() - Read data from storage.
30 * PS_GC_FUNC() - Perform GC. Called by probability
31 * (session.gc_probability/session.gc_divisor).
32 * PS_WRITE_FUNC() or PS_UPDATE_TIMESTAMP()
33 * - Write session data or update session data timestamp.
34 * It depends on session data change.
35 * PS_CLOSE_FUNC() - Clean up module data created by PS_OPEN_FUNC().
36 *
37 * Session module guarantees PS_OPEN_FUNC() is called before calling other
38 * PS_*_FUNC() functions. Other than this, session module may call any
39 * PS_*_FUNC() at any time. You may assume non null *mod_data created by
40 * PS_OPEN_FUNC() is passed to PS_*_FUNC().
41 *
42 * NOTE:
43 * - Save handlers _MUST_NOT_ change/refer PS() values.
44 * i.e. PS(id), PS(session_status), PS(mod) and any other PS() values.
45 * Use only function parameters passed from session module.
46 * - Save handler _MUST_ use PS_GET_MOD_DATA()/PS_SET_MOD_DATA() macro to
47 * set/get save handler module data(mod_data). mod_data contains
48 * data required by PS modules. It will not be NULL except PS_OPEN_FUNC().
49 * - Refer to PS_* macros in php_session.h for function/parameter definitions.
50 * - Returning FAILURE state from PS_* function results in raising errors.
51 * Avoid failure state as much as possible.
52 * - Use static ps_[module name]_[function name] functions for internal use.
53 *************************************************************************/
54
55 #include "php.h"
56
57 #include <sys/stat.h>
58 #include <sys/types.h>
59
60 #if HAVE_SYS_FILE_H
61 #include <sys/file.h>
62 #endif
63
64 #if HAVE_DIRENT_H
65 #include <dirent.h>
66 #endif
67
68 #ifdef PHP_WIN32
69 #include "win32/readdir.h"
70 #endif
71 #include <time.h>
72
73 #include <fcntl.h>
74 #include <errno.h>
75
76 #if HAVE_UNISTD_H
77 #include <unistd.h>
78 #endif
79
80 #include "php_session.h"
81 #include "mod_files.h"
82 #include "ext/standard/flock_compat.h"
83 #include "php_open_temporary_file.h"
84
85 #define FILE_PREFIX "sess_"
86
87 #ifdef PHP_WIN32
88 # ifndef O_NOFOLLOW
89 # define O_NOFOLLOW 0
90 # endif
91 #endif
92
93 typedef struct {
94 char *lastkey;
95 char *basedir;
96 size_t basedir_len;
97 size_t dirdepth;
98 size_t st_size;
99 int filemode;
100 int fd;
101 } ps_files;
102
103 ps_module ps_mod_files = {
104 /* New save handlers MUST use PS_MOD_UPDATE_TIMESTAMP macro */
105 PS_MOD_UPDATE_TIMESTAMP(files)
106 };
107
108
ps_files_path_create(char * buf,size_t buflen,ps_files * data,const char * key)109 static char *ps_files_path_create(char *buf, size_t buflen, ps_files *data, const char *key)
110 {
111 size_t key_len;
112 const char *p;
113 int i;
114 size_t n;
115
116 key_len = strlen(key);
117 if (!data || key_len <= data->dirdepth ||
118 buflen < (strlen(data->basedir) + 2 * data->dirdepth + key_len + 5 + sizeof(FILE_PREFIX))) {
119 return NULL;
120 }
121
122 p = key;
123 memcpy(buf, data->basedir, data->basedir_len);
124 n = data->basedir_len;
125 buf[n++] = PHP_DIR_SEPARATOR;
126 for (i = 0; i < (int)data->dirdepth; i++) {
127 buf[n++] = *p++;
128 buf[n++] = PHP_DIR_SEPARATOR;
129 }
130 memcpy(buf + n, FILE_PREFIX, sizeof(FILE_PREFIX) - 1);
131 n += sizeof(FILE_PREFIX) - 1;
132 memcpy(buf + n, key, key_len);
133 n += key_len;
134 buf[n] = '\0';
135
136 return buf;
137 }
138
139 #ifndef O_BINARY
140 # define O_BINARY 0
141 #endif
142
ps_files_close(ps_files * data)143 static void ps_files_close(ps_files *data)
144 {
145 if (data->fd != -1) {
146 #ifdef PHP_WIN32
147 /* On Win32 locked files that are closed without being explicitly unlocked
148 will be unlocked only when "system resources become available". */
149 flock(data->fd, LOCK_UN);
150 #endif
151 close(data->fd);
152 data->fd = -1;
153 }
154 }
155
ps_files_open(ps_files * data,const char * key)156 static void ps_files_open(ps_files *data, const char *key)
157 {
158 char buf[MAXPATHLEN];
159 #if !defined(O_NOFOLLOW) || !defined(PHP_WIN32)
160 struct stat sbuf;
161 #endif
162 int ret;
163
164 if (data->fd < 0 || !data->lastkey || strcmp(key, data->lastkey)) {
165 if (data->lastkey) {
166 efree(data->lastkey);
167 data->lastkey = NULL;
168 }
169
170 ps_files_close(data);
171
172 if (php_session_valid_key(key) == FAILURE) {
173 php_error_docref(NULL, E_WARNING, "The session id is too long or contains illegal characters, valid characters are a-z, A-Z, 0-9 and '-,'");
174 return;
175 }
176
177 if (!ps_files_path_create(buf, sizeof(buf), data, key)) {
178 php_error_docref(NULL, E_WARNING, "Failed to create session data file path. Too short session ID, invalid save_path or path lentgth exceeds MAXPATHLEN(%d)", MAXPATHLEN);
179 return;
180 }
181
182 data->lastkey = estrdup(key);
183
184 /* O_NOFOLLOW to prevent us from following evil symlinks */
185 #ifdef O_NOFOLLOW
186 data->fd = VCWD_OPEN_MODE(buf, O_CREAT | O_RDWR | O_BINARY | O_NOFOLLOW, data->filemode);
187 #else
188 /* Check to make sure that the opened file is not outside of allowable dirs.
189 This is not 100% safe but it's hard to do something better without O_NOFOLLOW */
190 if(PG(open_basedir) && lstat(buf, &sbuf) == 0 && S_ISLNK(sbuf.st_mode) && php_check_open_basedir(buf)) {
191 return;
192 }
193 data->fd = VCWD_OPEN_MODE(buf, O_CREAT | O_RDWR | O_BINARY, data->filemode);
194 #endif
195
196 if (data->fd != -1) {
197 #ifndef PHP_WIN32
198 /* check that this session file was created by us or root – we
199 don't want to end up accepting the sessions of another webapp
200
201 If the process is ran by root, we ignore session file ownership
202 Use case: session is initiated by Apache under non-root and then
203 accessed by backend with root permissions to execute some system tasks.
204
205 */
206 if (zend_fstat(data->fd, &sbuf) || (sbuf.st_uid != 0 && sbuf.st_uid != getuid() && sbuf.st_uid != geteuid() && getuid() != 0)) {
207 close(data->fd);
208 data->fd = -1;
209 php_error_docref(NULL, E_WARNING, "Session data file is not created by your uid");
210 return;
211 }
212 #endif
213 do {
214 ret = flock(data->fd, LOCK_EX);
215 } while (ret == -1 && errno == EINTR);
216
217 #ifdef F_SETFD
218 # ifndef FD_CLOEXEC
219 # define FD_CLOEXEC 1
220 # endif
221 if (fcntl(data->fd, F_SETFD, FD_CLOEXEC)) {
222 php_error_docref(NULL, E_WARNING, "fcntl(%d, F_SETFD, FD_CLOEXEC) failed: %s (%d)", data->fd, strerror(errno), errno);
223 }
224 #endif
225 } else {
226 php_error_docref(NULL, E_WARNING, "open(%s, O_RDWR) failed: %s (%d)", buf, strerror(errno), errno);
227 }
228 }
229 }
230
ps_files_write(ps_files * data,zend_string * key,zend_string * val)231 static int ps_files_write(ps_files *data, zend_string *key, zend_string *val)
232 {
233 size_t n = 0;
234
235 /* PS(id) may be changed by calling session_regenerate_id().
236 Re-initialization should be tried here. ps_files_open() checks
237 data->lastkey and reopen when it is needed. */
238 ps_files_open(data, ZSTR_VAL(key));
239 if (data->fd < 0) {
240 return FAILURE;
241 }
242
243 /* Truncate file if the amount of new data is smaller than the existing data set. */
244 if (ZSTR_LEN(val) < data->st_size) {
245 php_ignore_value(ftruncate(data->fd, 0));
246 }
247
248 #if defined(HAVE_PWRITE)
249 n = pwrite(data->fd, ZSTR_VAL(val), ZSTR_LEN(val), 0);
250 #else
251 lseek(data->fd, 0, SEEK_SET);
252 #ifdef PHP_WIN32
253 {
254 unsigned int to_write = ZSTR_LEN(val) > UINT_MAX ? UINT_MAX : (unsigned int)ZSTR_LEN(val);
255 char *buf = ZSTR_VAL(val);
256 int wrote;
257
258 do {
259 wrote = _write(data->fd, buf, to_write);
260
261 n += wrote;
262 buf = wrote > -1 ? buf + wrote : 0;
263 to_write = wrote > -1 ? (ZSTR_LEN(val) - n > UINT_MAX ? UINT_MAX : (unsigned int)(ZSTR_LEN(val) - n)): 0;
264
265 } while(wrote > 0);
266 }
267 #else
268 n = write(data->fd, ZSTR_VAL(val), ZSTR_LEN(val));
269 #endif
270 #endif
271
272 if (n != ZSTR_LEN(val)) {
273 if (n == (size_t)-1) {
274 php_error_docref(NULL, E_WARNING, "write failed: %s (%d)", strerror(errno), errno);
275 } else {
276 php_error_docref(NULL, E_WARNING, "write wrote less bytes than requested");
277 }
278 return FAILURE;
279 }
280
281 return SUCCESS;
282 }
283
ps_files_cleanup_dir(const char * dirname,zend_long maxlifetime)284 static int ps_files_cleanup_dir(const char *dirname, zend_long maxlifetime)
285 {
286 DIR *dir;
287 char dentry[sizeof(struct dirent) + MAXPATHLEN];
288 struct dirent *entry = (struct dirent *) &dentry;
289 zend_stat_t sbuf;
290 char buf[MAXPATHLEN];
291 time_t now;
292 int nrdels = 0;
293 size_t dirname_len;
294
295 dir = opendir(dirname);
296 if (!dir) {
297 php_error_docref(NULL, E_NOTICE, "ps_files_cleanup_dir: opendir(%s) failed: %s (%d)", dirname, strerror(errno), errno);
298 return (0);
299 }
300
301 time(&now);
302
303 dirname_len = strlen(dirname);
304
305 if (dirname_len >= MAXPATHLEN) {
306 php_error_docref(NULL, E_NOTICE, "ps_files_cleanup_dir: dirname(%s) is too long", dirname);
307 closedir(dir);
308 return (0);
309 }
310
311 /* Prepare buffer (dirname never changes) */
312 memcpy(buf, dirname, dirname_len);
313 buf[dirname_len] = PHP_DIR_SEPARATOR;
314
315 while (php_readdir_r(dir, (struct dirent *) dentry, &entry) == 0 && entry) {
316 /* does the file start with our prefix? */
317 if (!strncmp(entry->d_name, FILE_PREFIX, sizeof(FILE_PREFIX) - 1)) {
318 size_t entry_len = strlen(entry->d_name);
319
320 /* does it fit into our buffer? */
321 if (entry_len + dirname_len + 2 < MAXPATHLEN) {
322 /* create the full path.. */
323 memcpy(buf + dirname_len + 1, entry->d_name, entry_len);
324
325 /* NUL terminate it and */
326 buf[dirname_len + entry_len + 1] = '\0';
327
328 /* check whether its last access was more than maxlifetime ago */
329 if (VCWD_STAT(buf, &sbuf) == 0 &&
330 (now - sbuf.st_mtime) > maxlifetime) {
331 VCWD_UNLINK(buf);
332 nrdels++;
333 }
334 }
335 }
336 }
337
338 closedir(dir);
339
340 return (nrdels);
341 }
342
ps_files_key_exists(ps_files * data,const char * key)343 static int ps_files_key_exists(ps_files *data, const char *key)
344 {
345 char buf[MAXPATHLEN];
346 zend_stat_t sbuf;
347
348 if (!key || !ps_files_path_create(buf, sizeof(buf), data, key)) {
349 return FAILURE;
350 }
351 if (VCWD_STAT(buf, &sbuf)) {
352 return FAILURE;
353 }
354 return SUCCESS;
355 }
356
357
358 #define PS_FILES_DATA ps_files *data = PS_GET_MOD_DATA()
359
360
361 /*
362 * Open save handler. Setup resources that are needed by the handler.
363 * PARAMETERS: PS_OPEN_ARGS in php_session.h
364 * RETURN VALUE: SUCCESS or FAILURE. Must set non-NULL valid module data
365 * (void **mod_data) with SUCCESS, NULL(default) for FAILUREs.
366 *
367 * Files save handler checks/create save_path directory and setup ps_files data.
368 * Note that files save handler supports splitting session data into multiple
369 * directories.
370 * *mod_data, *save_path, *session_name are guaranteed to have non-NULL values.
371 */
PS_OPEN_FUNC(files)372 PS_OPEN_FUNC(files)
373 {
374 ps_files *data;
375 const char *p, *last;
376 const char *argv[3];
377 int argc = 0;
378 size_t dirdepth = 0;
379 int filemode = 0600;
380
381 if (*save_path == '\0') {
382 /* if save path is an empty string, determine the temporary dir */
383 save_path = php_get_temporary_directory();
384
385 if (php_check_open_basedir(save_path)) {
386 return FAILURE;
387 }
388 }
389
390 /* split up input parameter */
391 last = save_path;
392 p = strchr(save_path, ';');
393 while (p) {
394 argv[argc++] = last;
395 last = ++p;
396 p = strchr(p, ';');
397 if (argc > 1) break;
398 }
399 argv[argc++] = last;
400
401 if (argc > 1) {
402 errno = 0;
403 dirdepth = (size_t) ZEND_STRTOL(argv[0], NULL, 10);
404 if (errno == ERANGE) {
405 php_error(E_WARNING, "The first parameter in session.save_path is invalid");
406 return FAILURE;
407 }
408 }
409
410 if (argc > 2) {
411 errno = 0;
412 filemode = (int)ZEND_STRTOL(argv[1], NULL, 8);
413 if (errno == ERANGE || filemode < 0 || filemode > 07777) {
414 php_error(E_WARNING, "The second parameter in session.save_path is invalid");
415 return FAILURE;
416 }
417 }
418 save_path = argv[argc - 1];
419
420 data = ecalloc(1, sizeof(*data));
421
422 data->fd = -1;
423 data->dirdepth = dirdepth;
424 data->filemode = filemode;
425 data->basedir_len = strlen(save_path);
426 data->basedir = estrndup(save_path, data->basedir_len);
427
428 if (PS_GET_MOD_DATA()) {
429 ps_close_files(mod_data);
430 }
431 PS_SET_MOD_DATA(data);
432
433 return SUCCESS;
434 }
435
436
437 /*
438 * Clean up opened resources.
439 * PARAMETERS: PS_CLOSE_ARGS in php_session.h
440 * RETURN VALUE: SUCCESS. Must set PS module data(void **mod_data) to NULL.
441 *
442 * Files save handler closes open files and it's memory.
443 * *mod_data is guaranteed to have non-NULL value.
444 * PS_CLOSE_FUNC() must set *mod_data to NULL. PS_CLOSE_FUNC() should not
445 * fail.
446 */
PS_CLOSE_FUNC(files)447 PS_CLOSE_FUNC(files)
448 {
449 PS_FILES_DATA;
450
451 ps_files_close(data);
452
453 if (data->lastkey) {
454 efree(data->lastkey);
455 data->lastkey = NULL;
456 }
457
458 efree(data->basedir);
459 efree(data);
460 PS_SET_MOD_DATA(NULL);
461
462 return SUCCESS;
463 }
464
465
466 /*
467 * Read session data from opened resource.
468 * PARAMETERS: PS_READ_ARGS in php_session.h
469 * RETURN VALUE: SUCCESS or FAILURE. Must set non-NULL session data to (zend_string **val)
470 * for SUCCESS. NULL(default) for FAILUREs.
471 *
472 * Files save handler supports splitting session data into multiple
473 * directories.
474 * *mod_data, *key are guaranteed to have non-NULL values.
475 */
PS_READ_FUNC(files)476 PS_READ_FUNC(files)
477 {
478 zend_long n = 0;
479 zend_stat_t sbuf;
480 PS_FILES_DATA;
481
482 ps_files_open(data, ZSTR_VAL(key));
483 if (data->fd < 0) {
484 return FAILURE;
485 }
486
487 if (zend_fstat(data->fd, &sbuf)) {
488 return FAILURE;
489 }
490
491 data->st_size = sbuf.st_size;
492
493 if (sbuf.st_size == 0) {
494 *val = ZSTR_EMPTY_ALLOC();
495 return SUCCESS;
496 }
497
498 *val = zend_string_alloc(sbuf.st_size, 0);
499
500 #if defined(HAVE_PREAD)
501 n = pread(data->fd, ZSTR_VAL(*val), ZSTR_LEN(*val), 0);
502 #else
503 lseek(data->fd, 0, SEEK_SET);
504 #ifdef PHP_WIN32
505 {
506 unsigned int to_read = ZSTR_LEN(*val) > UINT_MAX ? UINT_MAX : (unsigned int)ZSTR_LEN(*val);
507 char *buf = ZSTR_VAL(*val);
508 int read_in;
509
510 do {
511 read_in = _read(data->fd, buf, to_read);
512
513 n += read_in;
514 buf = read_in > -1 ? buf + read_in : 0;
515 to_read = read_in > -1 ? (ZSTR_LEN(*val) - n > UINT_MAX ? UINT_MAX : (unsigned int)(ZSTR_LEN(*val) - n)): 0;
516
517 } while(read_in > 0);
518
519 }
520 #else
521 n = read(data->fd, ZSTR_VAL(*val), ZSTR_LEN(*val));
522 #endif
523 #endif
524
525 if (n != (zend_long)sbuf.st_size) {
526 if (n == -1) {
527 php_error_docref(NULL, E_WARNING, "read failed: %s (%d)", strerror(errno), errno);
528 } else {
529 php_error_docref(NULL, E_WARNING, "read returned less bytes than requested");
530 }
531 zend_string_release(*val);
532 *val = ZSTR_EMPTY_ALLOC();
533 return FAILURE;
534 }
535
536 ZSTR_VAL(*val)[ZSTR_LEN(*val)] = '\0';
537 return SUCCESS;
538 }
539
540
541 /*
542 * Write session data.
543 * PARAMETERS: PS_WRITE_ARGS in php_session.h
544 * RETURN VALUE: SUCCESS or FAILURE.
545 *
546 * PS_WRITE_FUNC() must write session data(zend_string *val) unconditionally.
547 * *mod_data, *key, *val are guaranteed to have non-NULL values.
548 */
PS_WRITE_FUNC(files)549 PS_WRITE_FUNC(files)
550 {
551 PS_FILES_DATA;
552
553 return ps_files_write(data, key, val);
554 }
555
556
557 /*
558 * Update session data modification/access time stamp.
559 * PARAMETERS: PS_UPDATE_TIMESTAMP_ARGS in php_session.h
560 * RETURN VALUE: SUCCESS or FAILURE.
561 *
562 * PS_UPDATE_TIMESTAMP_FUNC() updates time stamp(mtime) so that active session
563 * data files will not be purged by GC. If session data storage does not need to
564 * update timestamp, it should return SUCCESS simply. (e.g. Memcache)
565 * *mod_data, *key, *val are guaranteed to have non-NULL values.
566 *
567 * NOTE: Updating access timestamp at PS_READ_FUNC() may extend life of obsolete
568 * session data. Use of PS_UPDATE_TIMESTAMP_FUNC() is preferred whenever it is
569 * possible.
570 */
PS_UPDATE_TIMESTAMP_FUNC(files)571 PS_UPDATE_TIMESTAMP_FUNC(files)
572 {
573 char buf[MAXPATHLEN];
574 struct utimbuf newtimebuf;
575 struct utimbuf *newtime = &newtimebuf;
576 int ret;
577 PS_FILES_DATA;
578
579 if (!ps_files_path_create(buf, sizeof(buf), data, ZSTR_VAL(key))) {
580 return FAILURE;
581 }
582
583 /* Update mtime */
584 #ifdef HAVE_UTIME_NULL
585 newtime = NULL;
586 #else
587 newtime->modtime = newtime->actime = time(NULL);
588 #endif
589 ret = VCWD_UTIME(buf, newtime);
590 if (ret == -1) {
591 /* New session ID, create data file */
592 return ps_files_write(data, key, val);
593 }
594
595 return SUCCESS;
596 }
597
598
599 /*
600 * Delete session data.
601 * PARAMETERS: PS_DESTROY_ARGS in php_session.h
602 * RETURN VALUE: SUCCESS or FAILURE.
603 *
604 * PS_DESTROY_FUNC() must remove the session data specified by *key from
605 * session data storage unconditionally. It must not return FAILURE for
606 * non-existent session data.
607 * *mod_data, *key are guaranteed to have non-NULL values.
608 */
PS_DESTROY_FUNC(files)609 PS_DESTROY_FUNC(files)
610 {
611 char buf[MAXPATHLEN];
612 PS_FILES_DATA;
613
614 if (!ps_files_path_create(buf, sizeof(buf), data, ZSTR_VAL(key))) {
615 return FAILURE;
616 }
617
618 if (data->fd != -1) {
619 ps_files_close(data);
620
621 if (VCWD_UNLINK(buf) == -1) {
622 /* This is a little safety check for instances when we are dealing with a regenerated session
623 * that was not yet written to disk. */
624 if (!VCWD_ACCESS(buf, F_OK)) {
625 return FAILURE;
626 }
627 }
628 }
629
630 return SUCCESS;
631 }
632
633
634 /*
635 * Cleanup expired session data.
636 * PARAMETERS: PS_GC_ARGS in php_session.h
637 * RETURN VALUE: SUCCESS or FAILURE. Number of deleted records(int *nrdels(default=-1)).
638 *
639 * PS_GC_FUNC() must remove session data that are not accessed
640 * 'session.maxlifetime'(seconds). If storage does not need manual GC, it
641 * may return SUCCESS simply. (e.g. Memcache) It must set number of records
642 * deleted(nrdels).
643 * *mod_data is guaranteed to have non-NULL value.
644 */
PS_GC_FUNC(files)645 PS_GC_FUNC(files)
646 {
647 PS_FILES_DATA;
648
649 /* We don't perform any cleanup, if dirdepth is larger than 0.
650 we return SUCCESS, since all cleanup should be handled by
651 an external entity (i.e. find -ctime x | xargs rm) */
652
653 if (data->dirdepth == 0) {
654 *nrdels = ps_files_cleanup_dir(data->basedir, maxlifetime);
655 } else {
656 *nrdels = -1; // Cannot process multiple depth save dir
657 }
658
659 return *nrdels;
660 }
661
662
663 /*
664 * Create session ID.
665 * PARAMETERS: PS_CREATE_SID_ARGS in php_session.h
666 * RETURN VALUE: Valid session ID(zend_string *) or NULL for FAILURE.
667 *
668 * PS_CREATE_SID_FUNC() must check collision. i.e. Check session data if
669 * new sid exists already.
670 * *mod_data is guaranteed to have non-NULL value.
671 * NOTE: Default php_session_create_id() does not check collision. If
672 * NULL is returned, session module create new ID by using php_session_create_id().
673 * If php_session_create_id() fails due to invalid configuration, it raises E_ERROR.
674 * NULL return value checks from php_session_create_id() is not required generally.
675 */
PS_CREATE_SID_FUNC(files)676 PS_CREATE_SID_FUNC(files)
677 {
678 zend_string *sid;
679 int maxfail = 3;
680 PS_FILES_DATA;
681
682 do {
683 sid = php_session_create_id((void**)&data);
684 if (!sid) {
685 if (--maxfail < 0) {
686 return NULL;
687 } else {
688 continue;
689 }
690 }
691 /* Check collision */
692 /* FIXME: mod_data(data) should not be NULL (User handler could be NULL) */
693 if (data && ps_files_key_exists(data, ZSTR_VAL(sid)) == SUCCESS) {
694 if (sid) {
695 zend_string_release(sid);
696 sid = NULL;
697 }
698 if (--maxfail < 0) {
699 return NULL;
700 }
701 }
702 } while(!sid);
703
704 return sid;
705 }
706
707
708 /*
709 * Check session ID existence for use_strict_mode support.
710 * PARAMETERS: PS_VALIDATE_SID_ARGS in php_session.h
711 * RETURN VALUE: SUCCESS or FAILURE.
712 *
713 * Return SUCCESS for valid key(already existing session).
714 * Return FAILURE for invalid key(non-existing session).
715 * *mod_data, *key are guaranteed to have non-NULL values.
716 */
PS_VALIDATE_SID_FUNC(files)717 PS_VALIDATE_SID_FUNC(files)
718 {
719 PS_FILES_DATA;
720
721 return ps_files_key_exists(data, ZSTR_VAL(key));
722 }
723
724 /*
725 * Local variables:
726 * tab-width: 4
727 * c-basic-offset: 4
728 * End:
729 * vim600: sw=4 ts=4 fdm=marker
730 * vim<600: sw=4 ts=4
731 */
732
