source: trunk/include/slib.h@ 6

Last change on this file since 6 was 1, checked in by katerina, 19 years ago

Initial import
File size: 13.2 KB
Line 
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
26/****************
27
28 -- Defined in config.h. --
29
30 #ifndef _(string)
31 #define _(string) string
32 #endif
33
34 #ifndef N_(string)
35 #define N_(string) string
36 #endif
37
38*****************/
39
40/* --------------------------------------------------------------
41 *
42 * Typedefs, global variables, macros.
43 *
44 * --------------------------------------------------------------
45 */
46
47extern long int sl_errno; /* Global error variable. */
48
49
50/* The ticketing system; used to hide internals from the
51 * programmer.
52 */
53typedef long int SL_TICKET; /* Unique ID for opened files. */
54
55
56/*
57 * TRUE, FALSE
58 */
59#define SL_TRUE 1
60#define SL_FALSE 0
61
62
63
64/*
65 * The following macros are provided:
66 *
67 * SL_ISERROR(x) TRUE if return status of 'x' is an error code.
68 * SL_REQUIRE(x, xstr) Abort if 'x' is false.
69 * SL_ENTER(s) Trace entry in function 's'.
70 * SL_RETURN(x, s) Trace return from function 's'.
71 */
72
73
74/*
75 * The error codes.
76 */
77#define SL_ENONE 0
78
79#define SL_ENULL -1024 /* Invalid use of NULL pointer. */
80#define SL_ERANGE -1025 /* Argument out of range. */
81#define SL_ETRUNC -1026 /* Result truncated. */
82#define SL_EREPEAT -1027 /* Illegal repeated use of function. */
83
84#define SL_EINTERNAL -1028 /* Internal error. */
85#define SL_ETICKET -1029 /* Bad ticket. */
86#define SL_EBADFILE -1030 /* File access error. Check errno. */
87#define SL_EBOGUS -1031 /* Bogus file. */
88#define SL_EMEM -1032 /* Out of memory. */
89#define SL_EUNLINK -1033 /* Unlink error. Check errno. */
90#define SL_EREWIND -1034 /* Rewind error. Check errno. */
91#define SL_EFORWARD -1035 /* Forward error. Check errno. */
92#define SL_EREAD -1036 /* Read error. Check errno. */
93#define SL_EWRITE -1037 /* Write error. Check errno. */
94#define SL_ESYNC -1038 /* Write error. Check errno. */
95
96#define SL_EBADNAME -1040 /* Invalid name. */
97#define SL_ESTAT -1041 /* stat of file failed. Check errno. */
98
99#define SL_EBADUID -1050 /* Owner not trustworthy. */
100#define SL_EBADGID -1051 /* Group writeable and not trustworthy.*/
101#define SL_EBADOTH -1052 /* World writeable. */
102
103#define SL_TOOMANY -1053 /* Too many open files */
104#define SL_TIMEOUT -1054 /* Timeout in read */
105/*
106 * All int functions return SL_NONE on success.
107 */
108
109#ifdef __cplusplus
110extern "C" {
111#endif
112
113 int dlog (int flag, char * file, int line, const char *fmt, ...);
114
115 char * sl_get_errmsg();
116
117 /* ----------------------------------------------------------------
118 *
119 * Heap consistency routines
120 *
121 * ---------------------------------------------------------------- */
122
123 int sl_test_heap();
124
125 /* ----------------------------------------------------------------
126 *
127 * Capability routines
128 *
129 * ---------------------------------------------------------------- */
130
131 extern int sl_useCaps;
132
133 int sl_drop_cap ();
134 int sl_drop_cap_sub();
135 int sl_get_cap_sub();
136 int sl_drop_cap_qdel();
137 int sl_get_cap_qdel();
138
139 /* ----------------------------------------------------------------
140 *
141 * String handling routines
142 *
143 * ---------------------------------------------------------------- */
144
145 /*
146 * A memset that does not get optimized away
147 */
148 void *sl_memset(void *s, int c, size_t n);
149#undef memset
150#define memset sl_memset
151
152 /*
153 * Copy src to dst. siz is the length of dst.
154 */
155 int sl_strlcpy(char * dst, /*@null@*/const char * src, size_t siz);
156
157 /*
158 * Append src to dst. siz is the length of dst.
159 */
160 int sl_strlcat(char * dst, /*@null@*/const char *src, size_t siz);
161
162 /*
163 * An implementation of vsnprintf. va_start/va_end are in the caller
164 * function.
165 */
166 int sl_vsnprintf(char *str, size_t n,
167 const char *format, va_list vl );
168
169 /*
170 * An implementation of snprintf.
171 */
172 int sl_snprintf(char *str, size_t n,
173 const char *format, ... );
174
175 /*
176 * A robust drop-in replacement of strncpy. strlcpy is preferable.
177 */
178 char * sl_strncpy(/*@out@*/char *dst, const char *src, size_t size);
179
180 /*
181 * Robust strncat.
182 */
183 char * sl_strncat(char *dst, const char *src, size_t n);
184
185 /*
186 * strstr
187 */
188 char * sl_strstr (const char * haystack, const char * needle);
189
190 /*
191 * robust strncmp replacement
192 */
193 int sl_strncmp(const char * a, const char * b, size_t n);
194
195 /*
196 * robust strcmp replacement
197 */
198 int sl_strcmp(const char * a, const char * b);
199
200 /*
201 * robust strlen replacement
202 */
203#define sl_strlen(arg) ((arg == NULL) ? 0 : (strlen(arg)))
204
205 /* ----------------------------------------------------------------
206 *
207 * Privilege handling routines
208 *
209 * ---------------------------------------------------------------- */
210
211 /*
212 * ONE OF THE FOLLOWING THREE FUNCTIONS
213 * SHOULD BE CALLED BEFORE ANY OTHER OF THE
214 * UID HANDLING FUNCTIONS.
215 */
216 int sl_policy_get_user(char *username); /* drop SUID to <username> */
217 int sl_policy_get_real(char *username); /* drop privs to <username> */
218 int sl_policy_get_root(void); /* drop SUID to root */
219
220 /*
221 * If not using one of the above, use this function,
222 * and then call sh_unset_suid().
223 * This function saves the uid's.
224 * It calls abort() on error.
225 */
226 int sl_save_uids(void);
227
228 /*
229 * This function returns the saved euid.
230 * It calls abort() if the uid's are not saved already.
231 */
232 int sl_get_euid(/*@out@*/uid_t * ret);
233 uid_t sl_ret_euid();
234
235 /*
236 * This function returns the saved egid.
237 * It calls abort() if the uid's are not saved already.
238 */
239 int sl_get_egid(/*@out@*/gid_t * ret);
240
241 /*
242 * This function returns the saved current ruid.
243 * It calls abort() if the uid's are not saved already.
244 */
245 int sl_get_ruid(/*@out@*/uid_t * ret);
246
247 /*
248 * This function returns the saved current rgid.
249 * It calls abort() if the uid's are not saved already.
250 */
251 int sl_get_rgid(gid_t * ret);
252
253 /*
254 * This function returns the saved original ruid.
255 * It calls abort() if the uid's are not saved already.
256 */
257 int sl_get_ruid_orig(uid_t * ret);
258
259 /*
260 * This function returns the saved original rgid.
261 * It calls abort() if the uid's are not saved already.
262 */
263 int sl_get_rgid_orig(gid_t * ret);
264
265 /*
266 * This function returns true if the program is SUID.
267 * It calls abort() if the uid's are not saved already.
268 */
269 int sl_is_suid(void);
270
271 /*
272 * This function sets the effective uid
273 * to the saved effective uid.
274 */
275 int sl_set_suid (void);
276
277 /*
278 * This function sets the effective uid to the real uid.
279 */
280 int sl_unset_suid (void);
281
282 /*
283 * This function drops SUID privileges irrevocably.
284 */
285 int sl_drop_privileges(void);
286
287 /* ----------------------------------------------------------------
288 *
289 * File handling routines
290 *
291 * ---------------------------------------------------------------- */
292
293 SL_TICKET sl_make_ticket (int fd, char * path);
294
295 /* Open for writing.
296 */
297 SL_TICKET sl_open_write (char * fname, int priviledge_mode);
298
299 /* Open for reading.
300 */
301 SL_TICKET sl_open_read (char * fname, int priviledge_mode);
302
303 /* Open for reading w/minimum checking.
304 */
305 SL_TICKET sl_open_fastread (char * fname, int priviledge_mode);
306
307 /* Open for read and write.
308 */
309 SL_TICKET sl_open_rdwr (char * fname, int priviledge_mode);
310
311 /* Open for read and write, fail if file exists.
312 */
313 SL_TICKET sl_open_safe_rdwr (char * fname, int priv);
314
315 /* Open for write, truncate.
316 */
317 SL_TICKET sl_open_write_trunc (char * fname, int priviledge_mode);
318
319 /* Open for read and write, truncate.
320 */
321 SL_TICKET sl_open_rdwr_trunc (char * fname, int priviledge_mode);
322
323 /* Close file.
324 */
325 int sl_close (SL_TICKET ticket);
326
327 /* Unlink file.
328 */
329 int sl_unlink (SL_TICKET ticket);
330
331 /* Rewind file.
332 */
333 int sl_rewind (SL_TICKET ticket);
334
335 /* Seek file.
336 */
337 int sl_seek (SL_TICKET ticket, off_t off_data);
338
339 /* Forward file.
340 */
341 int sl_forward (SL_TICKET ticket);
342
343 /* Sync file.
344 */
345 int sl_sync (SL_TICKET ticket);
346
347 /* Read file.
348 */
349 int sl_read (SL_TICKET ticket, void * buf, size_t count);
350
351 int sl_read_timeout (SL_TICKET ticket, void * buf,
352 size_t count, int timeout);
353
354 int sl_read_fast (SL_TICKET ticket, void * buf_in, size_t count);
355
356 /* Write file.
357 */
358 int sl_write (SL_TICKET ticket, void * msg, long nbytes);
359
360 /* Write file, terminate with newline.
361 */
362 int sl_write_line (SL_TICKET ticket, void * msg, long nbytes);
363
364 /* Drop all metadata for file descriptors >= fd.
365 */
366 int sl_dropall(int fd, int except);
367
368 /* Check whether file is trustworthy.
369 */
370 int sl_trustfile(char * path, uid_t * ok, uid_t * bad);
371
372 /* Check whether file is trustworthy.
373 */
374 int sl_trustfile_euid(char * filename, uid_t euid);
375
376 /* purge list of trusted users
377 */
378 int sl_trust_purge_user ();
379
380 /* Add a trusted user.
381 */
382 int sl_trust_add_user (uid_t pwid);
383
384 /* Get error string.
385 */
386 char * sl_error_string(int errorcode);
387
388 /* Get error file.
389 */
390 char * sl_trust_errfile(void);
391
392
393#ifdef __cplusplus
394}
395#endif
396
397/* Privilege modes for file access.
398 */
399#define SL_YESPRIV 0x33
400#define SL_NOPRIV 0x34
401
402#define MAXFILENAME 2048
403
404
405/*
406 * This macro is TRUE if (x) < 0.
407 */
408#define SL_ISERROR(x) ((long)(x) < 0)
409
410#if defined(WITH_TPT)
411#define TPT(arg) dlog arg ;
412#else
413#define TPT(arg)
414#endif
415
416
417/*
418 * The 'require' macro.
419 */
420#define SL_REQUIRE(assertion, astext) \
421do { \
422 /*@i@*/ if (assertion) ; \
423 else { \
424 dlog(0, FIL__, __LINE__, SDG_AFAIL, \
425 FIL__, __LINE__, astext); \
426 _exit(EXIT_FAILURE); \
427 } \
428} while (0)
429
430
431/*
432 * The enter macro. Prints the trace if TRACE is on.
433 */
434extern int slib_do_trace;
435extern int slib_trace_fd;
436
437#if defined(SL_DEBUG)
438#define SL_ENTER(s) sl_stack_push(s, FIL__, __LINE__);
439#else
440#define SL_ENTER(s) if (slib_do_trace != 0) sl_trace_in(s, FIL__, __LINE__);
441#endif
442
443/*
444 * The return macro.
445 */
446#if defined(SL_DEBUG)
447#ifndef S_SPLINT_S
448#define SL_RETURN(x, s) \
449do { \
450 sl_stack_pop(s, FIL__, __LINE__); \
451 return(x); \
452} while(0)
453#else
454/*@notfunction@*/
455#define SL_RETURN(x, s) return(x);
456#endif /* S_SPLINT_S */
457#else
458#ifndef S_SPLINT_S
459#define SL_RETURN(x, s) \
460do { \
461 if (slib_do_trace != 0) \
462 sl_trace_out(s, FIL__, __LINE__); \
463 return(x); \
464} while(0)
465#else
466/*@notfunction@*/
467#define SL_RETURN(x, s) return(x);
468#endif /* S_SPLINT_S */
469#endif /* SL_RETURN macro */
470
471#if defined(SL_DEBUG)
472#define SL_RET0(s) \
473do { \
474 sl_stack_pop(s, FIL__, __LINE__); \
475 return; \
476} while(0)
477#else
478#ifndef S_SPLINT_S
479#define SL_RET0(s) \
480do { \
481 if (slib_do_trace != 0) \
482 sl_trace_out(s, FIL__, __LINE__); \
483 return; \
484} while(0)
485#else
486/*@notfunction@*/
487#define SL_RET0(s) return;
488#endif /* S_SPLINT_S */
489#endif /* SL_RETURN macro */
490
491#if defined(SL_DEBUG)
492void sl_stack_push(char * c, char * file, int line);
493void sl_stack_pop(char * c, char * file, int line);
494void sl_stack_print();
495#endif
496void sl_trace_in (char * str, char * file, int line);
497void sl_trace_out (char * str, char * file, int line);
498int sl_trace_file (char * str);
499int sl_trace_use (char * str);
500
501
502
503
504/*
505 * The internal return macro. Sets sl_errno to the return value.
506 */
507
508#if defined(SL_DEBUG)
509#define SL_IRETURN(x, s) \
510do { \
511 if((long)(x) < 0) { \
512 TPT((0, FIL__, __LINE__, SDG_ERROR, (long)(x))) \
513 sl_errno=(x); \
514 } \
515 sl_stack_pop(s, FIL__, __LINE__); \
516 if (1) return(x); \
517} while(0)
518#else
519#define SL_IRETURN(x, s) \
520do { \
521 if ((long)(x) < 0) sl_errno=(x); \
522 if (slib_do_trace) \
523 sl_trace_out(s, FIL__, __LINE__); \
524 if (1) return(x); \
525} while(0)
526
527#endif /* SL_IRETURN macro */
528
529
530
531/* slib.h */
532#endif
533
534
535
536
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