source: trunk/include/slib.h@ 412

Last change on this file since 412 was 412, checked in by katerina, 12 years ago

Enhancements for ticket #312 (logrotate) and #313 (--enable-suid).
File size: 16.6 KB
RevLine 
[1]1/* --------------------------------------------------------------
2 *
3 * The developement of this library has been stimulated by reading
4 * a paper on 'Robust Programming' by Matt Bishop, although
5 * not all of his ideas might be implemented in the same
6 * strictness as discussed in the paper.
7 *
8 * --------------------------------------------------------------
9 */
10
11#ifndef SL_SLIB_H
12#define SL_SLIB_H
13
14#include <errno.h>
15#include <stdio.h>
16#include <stdlib.h>
17#include <stdarg.h>
18#include <sys/types.h>
19
20#include "config_xor.h"
21
22#ifdef HAVE_UNISTD_H
23#include <unistd.h>
24#endif
25
[167]26#include "sh_string.h"
27
[1]28/****************
29
30 -- Defined in config.h. --
31
32 #ifndef _(string)
33 #define _(string) string
34 #endif
35
36 #ifndef N_(string)
37 #define N_(string) string
38 #endif
39
40*****************/
41
[412]42
[1]43/* --------------------------------------------------------------
44 *
45 * Typedefs, global variables, macros.
46 *
47 * --------------------------------------------------------------
48 */
49
50extern long int sl_errno; /* Global error variable. */
51
52
53/* The ticketing system; used to hide internals from the
54 * programmer.
55 */
56typedef long int SL_TICKET; /* Unique ID for opened files. */
57
58
59/*
60 * TRUE, FALSE
61 */
62#define SL_TRUE 1
63#define SL_FALSE 0
64
[138]65#define SH_GRBUF_SIZE 4096
66#define SH_PWBUF_SIZE 4096
[1]67
68
[149]69#if defined(__GNUC__) && (__GNUC__ >= 3)
70#undef SL_GNUC_CONST
71#define SL_GNUC_CONST __attribute__((const))
72#else
[156]73#undef SL_GNUC_CONST
74#define SL_GNUC_CONST
[149]75#endif
76
[1]77/*
78 * The following macros are provided:
79 *
80 * SL_ISERROR(x) TRUE if return status of 'x' is an error code.
81 * SL_REQUIRE(x, xstr) Abort if 'x' is false.
82 * SL_ENTER(s) Trace entry in function 's'.
83 * SL_RETURN(x, s) Trace return from function 's'.
84 */
85
86
87/*
88 * The error codes.
89 */
90#define SL_ENONE 0
91
92#define SL_ENULL -1024 /* Invalid use of NULL pointer. */
93#define SL_ERANGE -1025 /* Argument out of range. */
94#define SL_ETRUNC -1026 /* Result truncated. */
95#define SL_EREPEAT -1027 /* Illegal repeated use of function. */
96
97#define SL_EINTERNAL -1028 /* Internal error. */
98#define SL_ETICKET -1029 /* Bad ticket. */
99#define SL_EBADFILE -1030 /* File access error. Check errno. */
100#define SL_EBOGUS -1031 /* Bogus file. */
101#define SL_EMEM -1032 /* Out of memory. */
102#define SL_EUNLINK -1033 /* Unlink error. Check errno. */
103#define SL_EREWIND -1034 /* Rewind error. Check errno. */
104#define SL_EFORWARD -1035 /* Forward error. Check errno. */
105#define SL_EREAD -1036 /* Read error. Check errno. */
106#define SL_EWRITE -1037 /* Write error. Check errno. */
107#define SL_ESYNC -1038 /* Write error. Check errno. */
108
109#define SL_EBADNAME -1040 /* Invalid name. */
110#define SL_ESTAT -1041 /* stat of file failed. Check errno. */
[192]111#define SL_EFSTAT -1042 /* fstat of file failed. Check errno. */
[1]112
113#define SL_EBADUID -1050 /* Owner not trustworthy. */
114#define SL_EBADGID -1051 /* Group writeable and not trustworthy.*/
115#define SL_EBADOTH -1052 /* World writeable. */
116
117#define SL_TOOMANY -1053 /* Too many open files */
118#define SL_TIMEOUT -1054 /* Timeout in read */
[192]119
120#define SL_EISDIR -1055 /* Is a directory */
[243]121
122#define SL_EINTERNAL01 -1061 /* Internal error. */
123#define SL_EINTERNAL02 -1062 /* Internal error. */
124#define SL_EINTERNAL03 -1063 /* Internal error. */
125#define SL_EINTERNAL04 -1064 /* Internal error. */
126#define SL_EINTERNAL05 -1065 /* Internal error. */
127#define SL_EINTERNAL06 -1066 /* Internal error. */
128#define SL_EINTERNAL07 -1067 /* Internal error. */
129#define SL_EINTERNAL08 -1068 /* Internal error. */
130#define SL_EINTERNAL09 -1069 /* Internal error. */
131#define SL_EINTERNAL10 -1070 /* Internal error. */
132#define SL_EINTERNAL11 -1071 /* Internal error. */
133#define SL_EINTERNAL12 -1072 /* Internal error. */
134
[1]135/*
136 * All int functions return SL_NONE on success.
137 */
138
139#ifdef __cplusplus
140extern "C" {
141#endif
142
[170]143 int dlog (int flag, const char * file, int line, const char *fmt, ...);
[1]144
[170]145 char * sl_get_errmsg(void);
[1]146
147 /* ----------------------------------------------------------------
148 *
149 * Heap consistency routines
150 *
151 * ---------------------------------------------------------------- */
152
[170]153 int sl_test_heap(void);
[1]154
155 /* ----------------------------------------------------------------
156 *
157 * Capability routines
158 *
159 * ---------------------------------------------------------------- */
160
161 extern int sl_useCaps;
162
[170]163 int sl_drop_cap (void);
164 int sl_drop_cap_sub(void);
165 int sl_get_cap_sub(void);
166 int sl_drop_cap_qdel(void);
167 int sl_get_cap_qdel(void);
[1]168
169 /* ----------------------------------------------------------------
170 *
171 * String handling routines
172 *
173 * ---------------------------------------------------------------- */
174
175 /*
176 * A memset that does not get optimized away
177 */
178 void *sl_memset(void *s, int c, size_t n);
[11]179#if !defined(SH_REAL_SET)
[1]180#undef memset
181#define memset sl_memset
[11]182#endif
[1]183
184 /*
185 * Copy src to dst. siz is the length of dst.
186 */
187 int sl_strlcpy(char * dst, /*@null@*/const char * src, size_t siz);
188
189 /*
190 * Append src to dst. siz is the length of dst.
191 */
192 int sl_strlcat(char * dst, /*@null@*/const char *src, size_t siz);
193
194 /*
195 * An implementation of vsnprintf. va_start/va_end are in the caller
196 * function.
197 */
198 int sl_vsnprintf(char *str, size_t n,
199 const char *format, va_list vl );
200
201 /*
202 * An implementation of snprintf.
203 */
204 int sl_snprintf(char *str, size_t n,
205 const char *format, ... );
206
207 /*
208 * A robust drop-in replacement of strncpy. strlcpy is preferable.
209 */
210 char * sl_strncpy(/*@out@*/char *dst, const char *src, size_t size);
211
212 /*
213 * Robust strncat.
214 */
215 char * sl_strncat(char *dst, const char *src, size_t n);
216
217 /*
218 * strstr
219 */
[214]220 char * sl_strstr (const char * haystack, const char * needle);
[1]221
222 /*
[272]223 * robust strn[case]cmp replacement
[1]224 */
225 int sl_strncmp(const char * a, const char * b, size_t n);
226
[272]227 int sl_strncasecmp(const char * a, const char * b, size_t n);
228
[1]229 /*
230 * robust strcmp replacement
231 */
232 int sl_strcmp(const char * a, const char * b);
233
234 /*
[169]235 * robust strcasecmp replacement
236 */
237 int sl_strcasecmp(const char * one, const char * two);
238
239 /*
[1]240 * robust strlen replacement
241 */
242#define sl_strlen(arg) ((arg == NULL) ? 0 : (strlen(arg)))
243
244 /* ----------------------------------------------------------------
245 *
246 * Privilege handling routines
247 *
248 * ---------------------------------------------------------------- */
249
250 /*
251 * ONE OF THE FOLLOWING THREE FUNCTIONS
252 * SHOULD BE CALLED BEFORE ANY OTHER OF THE
253 * UID HANDLING FUNCTIONS.
254 */
[170]255 int sl_policy_get_user(const char *username); /* drop SUID to <username> */
[1]256 int sl_policy_get_real(char *username); /* drop privs to <username> */
257 int sl_policy_get_root(void); /* drop SUID to root */
258
259 /*
260 * If not using one of the above, use this function,
261 * and then call sh_unset_suid().
262 * This function saves the uid's.
263 * It calls abort() on error.
264 */
265 int sl_save_uids(void);
266
267 /*
268 * This function returns the saved euid.
269 * It calls abort() if the uid's are not saved already.
270 */
271 int sl_get_euid(/*@out@*/uid_t * ret);
[170]272 uid_t sl_ret_euid(void);
[1]273
274 /*
275 * This function returns the saved egid.
276 * It calls abort() if the uid's are not saved already.
277 */
278 int sl_get_egid(/*@out@*/gid_t * ret);
279
280 /*
281 * This function returns the saved current ruid.
282 * It calls abort() if the uid's are not saved already.
283 */
284 int sl_get_ruid(/*@out@*/uid_t * ret);
285
286 /*
287 * This function returns the saved current rgid.
288 * It calls abort() if the uid's are not saved already.
289 */
290 int sl_get_rgid(gid_t * ret);
291
292 /*
293 * This function returns the saved original ruid.
294 * It calls abort() if the uid's are not saved already.
295 */
296 int sl_get_ruid_orig(uid_t * ret);
297
298 /*
299 * This function returns the saved original rgid.
300 * It calls abort() if the uid's are not saved already.
301 */
302 int sl_get_rgid_orig(gid_t * ret);
303
304 /*
305 * This function returns true if the program is SUID.
306 * It calls abort() if the uid's are not saved already.
307 */
308 int sl_is_suid(void);
309
310 /*
311 * This function sets the effective uid
312 * to the saved effective uid.
313 */
314 int sl_set_suid (void);
315
316 /*
317 * This function sets the effective uid to the real uid.
318 */
319 int sl_unset_suid (void);
320
321 /*
322 * This function drops SUID privileges irrevocably.
323 */
324 int sl_drop_privileges(void);
325
326 /* ----------------------------------------------------------------
327 *
328 * File handling routines
329 *
330 * ---------------------------------------------------------------- */
331
[248]332#define SL_OFILE_SIZE 32
[1]333
[252]334 char * sl_check_badfd();
[248]335 char * sl_check_stale();
336
[252]337 /* Create a file record for an open file
338 */
[248]339 SL_TICKET sl_make_ticket (const char * ofile, int oline,
[252]340 int fd, const char * filename, FILE * stream);
[248]341
[252]342 /* Get the pointer to a stream. If none exists yet, open it
343 */
344 FILE * sl_stream (SL_TICKET ticket, char * mode);
345
[1]346 /* Open for writing.
347 */
[248]348 SL_TICKET sl_open_write (const char * ofile, int oline,
349 const char * fname, int priviledge_mode);
[1]350
351 /* Open for reading.
352 */
[248]353 SL_TICKET sl_open_read (const char * ofile, int oline,
354 const char * fname, int priviledge_mode);
[1]355
[196]356 /* Drop from cach when closing
357 */
358 int sl_set_drop_cache(const char * str);
359
[1]360 /* Open for reading w/minimum checking.
361 */
[248]362 SL_TICKET sl_open_fastread (const char * ofile, int oline,
363 const char * fname, int priviledge_mode);
[1]364
365 /* Open for read and write.
366 */
[248]367 SL_TICKET sl_open_rdwr (const char * ofile, int oline,
368 const char * fname, int priviledge_mode);
[1]369
370 /* Open for read and write, fail if file exists.
371 */
[248]372 SL_TICKET sl_open_safe_rdwr (const char * ofile, int oline,
373 const char * fname, int priv);
[1]374
375 /* Open for write, truncate.
376 */
[248]377 SL_TICKET sl_open_write_trunc (const char * ofile, int oline,
378 const char * fname, int priviledge_mode);
[1]379
380 /* Open for read and write, truncate.
381 */
[248]382 SL_TICKET sl_open_rdwr_trunc (const char * ofile, int oline,
383 const char * fname, int priviledge_mode);
[1]384
[167]385 /* Initialize the content sh_string.
386 */
387 int sl_init_content (SL_TICKET ticket, size_t size);
388
389 /* Get the (pointer to) the content sh_string.
390 */
391 sh_string * sl_get_content (SL_TICKET ticket);
392
[212]393 /* Lock file (uses fcntl F_SETLK).
394 */
395 int sl_lock (SL_TICKET ticket);
396
[1]397 /* Close file.
398 */
399 int sl_close (SL_TICKET ticket);
400
[252]401 /* Close file descriptor.
402 */
403 int sl_close_fd (const char * file, int line, int fd);
404
405 /* Close stream.
406 */
407 int sl_fclose (const char * file, int line, FILE * fp);
408
[1]409 /* Unlink file.
410 */
411 int sl_unlink (SL_TICKET ticket);
412
413 /* Rewind file.
414 */
415 int sl_rewind (SL_TICKET ticket);
416
417 /* Seek file.
418 */
419 int sl_seek (SL_TICKET ticket, off_t off_data);
420
421 /* Forward file.
422 */
423 int sl_forward (SL_TICKET ticket);
424
425 /* Sync file.
426 */
427 int sl_sync (SL_TICKET ticket);
428
429 /* Read file.
430 */
431 int sl_read (SL_TICKET ticket, void * buf, size_t count);
432
[8]433 int sl_read_timeout_prep (SL_TICKET ticket);
434
[131]435 int sl_read_timeout_fd (int fd, void * buf,
436 size_t count, int timeout, int is_nonblocking);
437
[1]438 int sl_read_timeout (SL_TICKET ticket, void * buf,
[131]439 size_t count, int timeout, int is_nonblocking);
[1]440
441 int sl_read_fast (SL_TICKET ticket, void * buf_in, size_t count);
442
443 /* Write file.
444 */
[170]445 int sl_write (SL_TICKET ticket, const void * msg, long nbytes);
[1]446
447 /* Write file, terminate with newline.
448 */
[170]449 int sl_write_line (SL_TICKET ticket, const void * msg, long nbytes);
[1]450
[76]451 /* As above, but only for non-constant strings.
452 */
453 int sl_write_line_fast (SL_TICKET ticket, void * msg, long nbytes);
454
[1]455 /* Drop all metadata for file descriptors >= fd.
456 */
457 int sl_dropall(int fd, int except);
[174]458 int sl_dropall_dirty(int fd, int except); /* don't deallocate */
[1]459
460 /* Check whether file is trustworthy.
461 */
[183]462 int sl_trustfile(const char * path, uid_t * ok, uid_t * bad);
[1]463
464 /* Check whether file is trustworthy.
465 */
[183]466 int sl_trustfile_euid(const char * filename, uid_t euid);
[1]467
468 /* purge list of trusted users
469 */
[170]470 int sl_trust_purge_user (void);
[1]471
472 /* Add a trusted user.
473 */
474 int sl_trust_add_user (uid_t pwid);
475
476 /* Get error string.
477 */
478 char * sl_error_string(int errorcode);
479
480 /* Get error file.
481 */
482 char * sl_trust_errfile(void);
483
[20]484 /* Overflow tests
485 */
[149]486 int sl_ok_muli (int a, int b) SL_GNUC_CONST;
487 int sl_ok_divi (int a, int b) SL_GNUC_CONST;
488 int sl_ok_addi (int a, int b) SL_GNUC_CONST;
489 int sl_ok_subi (int a, int b) SL_GNUC_CONST;
[1]490
[149]491 int sl_ok_muls (size_t a, size_t b) SL_GNUC_CONST;
492 int sl_ok_adds (size_t a, size_t b) SL_GNUC_CONST;
[34]493
494
[1]495#ifdef __cplusplus
496}
497#endif
498
499/* Privilege modes for file access.
500 */
501#define SL_YESPRIV 0x33
502#define SL_NOPRIV 0x34
503
[76]504/* Suitable for Linux
505 */
506#define MAXFILENAME 4096
[1]507
508
509/*
510 * This macro is TRUE if (x) < 0.
511 */
512#define SL_ISERROR(x) ((long)(x) < 0)
513
514#if defined(WITH_TPT)
515#define TPT(arg) dlog arg ;
516#else
517#define TPT(arg)
518#endif
519
520
521/*
522 * The 'require' macro.
523 */
524#define SL_REQUIRE(assertion, astext) \
525do { \
526 /*@i@*/ if (assertion) ; \
527 else { \
528 dlog(0, FIL__, __LINE__, SDG_AFAIL, \
529 FIL__, __LINE__, astext); \
530 _exit(EXIT_FAILURE); \
531 } \
532} while (0)
533
534
535/*
536 * The enter macro. Prints the trace if TRACE is on.
537 */
538extern int slib_do_trace;
539extern int slib_trace_fd;
540
541#if defined(SL_DEBUG)
542#define SL_ENTER(s) sl_stack_push(s, FIL__, __LINE__);
543#else
544#define SL_ENTER(s) if (slib_do_trace != 0) sl_trace_in(s, FIL__, __LINE__);
545#endif
546
547/*
548 * The return macro.
549 */
550#if defined(SL_DEBUG)
551#ifndef S_SPLINT_S
552#define SL_RETURN(x, s) \
553do { \
554 sl_stack_pop(s, FIL__, __LINE__); \
555 return(x); \
556} while(0)
557#else
558/*@notfunction@*/
559#define SL_RETURN(x, s) return(x);
560#endif /* S_SPLINT_S */
561#else
562#ifndef S_SPLINT_S
563#define SL_RETURN(x, s) \
564do { \
565 if (slib_do_trace != 0) \
566 sl_trace_out(s, FIL__, __LINE__); \
567 return(x); \
568} while(0)
569#else
570/*@notfunction@*/
571#define SL_RETURN(x, s) return(x);
572#endif /* S_SPLINT_S */
573#endif /* SL_RETURN macro */
574
575#if defined(SL_DEBUG)
576#define SL_RET0(s) \
577do { \
578 sl_stack_pop(s, FIL__, __LINE__); \
579 return; \
580} while(0)
581#else
582#ifndef S_SPLINT_S
583#define SL_RET0(s) \
584do { \
585 if (slib_do_trace != 0) \
586 sl_trace_out(s, FIL__, __LINE__); \
587 return; \
588} while(0)
589#else
590/*@notfunction@*/
591#define SL_RET0(s) return;
592#endif /* S_SPLINT_S */
593#endif /* SL_RETURN macro */
594
595#if defined(SL_DEBUG)
596void sl_stack_push(char * c, char * file, int line);
597void sl_stack_pop(char * c, char * file, int line);
[170]598void sl_stack_print(void);
[1]599#endif
[170]600void sl_trace_in (const char * str, const char * file, int line);
601void sl_trace_out (const char * str, const char * file, int line);
[20]602int sl_trace_file (const char * str);
603int sl_trace_use (const char * str);
[1]604
605
606
607
608/*
609 * The internal return macro. Sets sl_errno to the return value.
610 */
611
612#if defined(SL_DEBUG)
613#define SL_IRETURN(x, s) \
614do { \
615 if((long)(x) < 0) { \
616 TPT((0, FIL__, __LINE__, SDG_ERROR, (long)(x))) \
617 sl_errno=(x); \
618 } \
619 sl_stack_pop(s, FIL__, __LINE__); \
620 if (1) return(x); \
621} while(0)
622#else
623#define SL_IRETURN(x, s) \
624do { \
625 if ((long)(x) < 0) sl_errno=(x); \
626 if (slib_do_trace) \
627 sl_trace_out(s, FIL__, __LINE__); \
628 if (1) return(x); \
629} while(0)
630
631#endif /* SL_IRETURN macro */
632
633
634
635/* slib.h */
636#endif
637
638
639
640
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