1 |
/* |
2 |
* fs/ccs_common.c |
3 |
* |
4 |
* Common functions for SAKURA and TOMOYO. |
5 |
* |
6 |
* Copyright (C) 2005-2008 NTT DATA CORPORATION |
7 |
* |
8 |
* Version: 1.6.0-pre 2008/02/18 |
9 |
* |
10 |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
11 |
* See README.ccs for ChangeLog. |
12 |
* |
13 |
*/ |
14 |
|
15 |
#include <linux/string.h> |
16 |
#include <linux/mm.h> |
17 |
#include <linux/utime.h> |
18 |
#include <linux/file.h> |
19 |
#include <linux/module.h> |
20 |
#include <linux/slab.h> |
21 |
#include <asm/uaccess.h> |
22 |
#include <stdarg.h> |
23 |
#include <linux/version.h> |
24 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) |
25 |
#include <linux/namei.h> |
26 |
#include <linux/mount.h> |
27 |
static const int lookup_flags = LOOKUP_FOLLOW; |
28 |
#else |
29 |
static const int lookup_flags = LOOKUP_FOLLOW | LOOKUP_POSITIVE; |
30 |
#endif |
31 |
#include <linux/realpath.h> |
32 |
#include <linux/ccs_common.h> |
33 |
#include <linux/ccs_proc.h> |
34 |
#include <linux/tomoyo.h> |
35 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24) |
36 |
#define find_task_by_pid find_task_by_vpid |
37 |
#endif |
38 |
|
39 |
#ifdef CONFIG_TOMOYO_MAX_ACCEPT_ENTRY |
40 |
#define MAX_ACCEPT_ENTRY (CONFIG_TOMOYO_MAX_ACCEPT_ENTRY) |
41 |
#else |
42 |
#define MAX_ACCEPT_ENTRY 2048 |
43 |
#endif |
44 |
#ifdef CONFIG_TOMOYO_MAX_GRANT_LOG |
45 |
#define MAX_GRANT_LOG (CONFIG_TOMOYO_MAX_GRANT_LOG) |
46 |
#else |
47 |
#define MAX_GRANT_LOG 1024 |
48 |
#endif |
49 |
#ifdef CONFIG_TOMOYO_MAX_REJECT_LOG |
50 |
#define MAX_REJECT_LOG (CONFIG_TOMOYO_MAX_REJECT_LOG) |
51 |
#else |
52 |
#define MAX_REJECT_LOG 1024 |
53 |
#endif |
54 |
|
55 |
/************************* VARIABLES *************************/ |
56 |
|
57 |
/* /sbin/init started? */ |
58 |
bool sbin_init_started = 0; |
59 |
|
60 |
const char *ccs_log_level = KERN_DEBUG; |
61 |
|
62 |
static struct { |
63 |
const char *keyword; |
64 |
unsigned int current_value; |
65 |
const unsigned int max_value; |
66 |
} ccs_control_array[CCS_MAX_CONTROL_INDEX] = { |
67 |
[CCS_PROFILE_COMMENT] = { "COMMENT", 0, 0 }, /* Reserved for string. */ |
68 |
[CCS_TOMOYO_MAC_FOR_FILE] = { "MAC_FOR_FILE", 0, 3 }, |
69 |
[CCS_TOMOYO_MAC_FOR_ARGV0] = { "MAC_FOR_ARGV0", 0, 3 }, |
70 |
[CCS_TOMOYO_MAC_FOR_ENV] = { "MAC_FOR_ENV", 0, 3 }, |
71 |
[CCS_TOMOYO_MAC_FOR_NETWORK] = { "MAC_FOR_NETWORK", 0, 3 }, |
72 |
[CCS_TOMOYO_MAC_FOR_SIGNAL] = { "MAC_FOR_SIGNAL", 0, 3 }, |
73 |
[CCS_SAKURA_DENY_CONCEAL_MOUNT] = { "DENY_CONCEAL_MOUNT", 0, 3 }, |
74 |
[CCS_SAKURA_RESTRICT_CHROOT] = { "RESTRICT_CHROOT", 0, 3 }, |
75 |
[CCS_SAKURA_RESTRICT_MOUNT] = { "RESTRICT_MOUNT", 0, 3 }, |
76 |
[CCS_SAKURA_RESTRICT_UNMOUNT] = { "RESTRICT_UNMOUNT", 0, 3 }, |
77 |
[CCS_SAKURA_RESTRICT_PIVOT_ROOT] = { "RESTRICT_PIVOT_ROOT", 0, 3 }, |
78 |
[CCS_SAKURA_RESTRICT_AUTOBIND] = { "RESTRICT_AUTOBIND", 0, 1 }, |
79 |
[CCS_TOMOYO_MAX_ACCEPT_ENTRY] = { "MAX_ACCEPT_ENTRY", MAX_ACCEPT_ENTRY, INT_MAX }, |
80 |
[CCS_TOMOYO_MAX_GRANT_LOG] = { "MAX_GRANT_LOG", MAX_GRANT_LOG, INT_MAX }, |
81 |
[CCS_TOMOYO_MAX_REJECT_LOG] = { "MAX_REJECT_LOG", MAX_REJECT_LOG, INT_MAX }, |
82 |
[CCS_TOMOYO_VERBOSE] = { "TOMOYO_VERBOSE", 1, 1 }, |
83 |
[CCS_ALLOW_ENFORCE_GRACE] = { "ALLOW_ENFORCE_GRACE", 0, 1 }, |
84 |
[CCS_SLEEP_PERIOD] = { "SLEEP_PERIOD", 0, 3000 }, /* in 0.1 second */ |
85 |
[CCS_TOMOYO_ALT_EXEC] = { "ALT_EXEC", 0, 0 }, /* Reserved for string. */ |
86 |
}; |
87 |
|
88 |
struct profile { |
89 |
unsigned int value[CCS_MAX_CONTROL_INDEX]; |
90 |
const struct path_info *comment; |
91 |
const struct path_info *alt_exec; |
92 |
}; |
93 |
|
94 |
static struct profile *profile_ptr[MAX_PROFILES]; |
95 |
|
96 |
/************************* UTILITY FUNCTIONS *************************/ |
97 |
|
98 |
#ifdef CONFIG_TOMOYO |
99 |
static int __init TOMOYO_Quiet_Setup(char *str) |
100 |
{ |
101 |
ccs_control_array[CCS_TOMOYO_VERBOSE].current_value = 0; |
102 |
return 0; |
103 |
} |
104 |
|
105 |
__setup("TOMOYO_QUIET", TOMOYO_Quiet_Setup); |
106 |
#endif |
107 |
|
108 |
/* Am I root? */ |
109 |
static int isRoot(struct io_buffer *head) |
110 |
{ |
111 |
const struct task_struct *task = current; |
112 |
return (!task->uid && !task->euid) || (task->uid && task->uid == head->uid) || (task->gid && task->gid == head->gid); |
113 |
} |
114 |
|
115 |
/* |
116 |
* Format string. |
117 |
* Leading and trailing whitespaces are removed. |
118 |
* Multiple whitespaces are packed into single space. |
119 |
*/ |
120 |
static void NormalizeLine(unsigned char *buffer) |
121 |
{ |
122 |
unsigned char *sp = buffer, *dp = buffer; |
123 |
int first = 1; |
124 |
while (*sp && (*sp <= ' ' || *sp >= 127)) sp++; |
125 |
while (*sp) { |
126 |
if (!first) *dp++ = ' '; |
127 |
first = 0; |
128 |
while (*sp > ' ' && *sp < 127) *dp++ = *sp++; |
129 |
while (*sp && (*sp <= ' ' || *sp >= 127)) sp++; |
130 |
} |
131 |
*dp = '\0'; |
132 |
} |
133 |
|
134 |
/* |
135 |
* Check whether the given filename follows the naming rules. |
136 |
* Returns nonzero if follows, zero otherwise. |
137 |
*/ |
138 |
bool IsCorrectPath(const char *filename, const s8 start_type, const s8 pattern_type, const s8 end_type, const char *function) |
139 |
{ |
140 |
int contains_pattern = 0; |
141 |
char c, d, e; |
142 |
const char *original_filename = filename; |
143 |
if (!filename) goto out; |
144 |
c = *filename; |
145 |
if (start_type == 1) { /* Must start with '/' */ |
146 |
if (c != '/') goto out; |
147 |
} else if (start_type == -1) { /* Must not start with '/' */ |
148 |
if (c == '/') goto out; |
149 |
} |
150 |
if (c) c = * (strchr(filename, '\0') - 1); |
151 |
if (end_type == 1) { /* Must end with '/' */ |
152 |
if (c != '/') goto out; |
153 |
} else if (end_type == -1) { /* Must not end with '/' */ |
154 |
if (c == '/') goto out; |
155 |
} |
156 |
while ((c = *filename++) != '\0') { |
157 |
if (c == '\\') { |
158 |
switch ((c = *filename++)) { |
159 |
case '\\': /* "\\" */ |
160 |
continue; |
161 |
case '$': /* "\$" */ |
162 |
case '+': /* "\+" */ |
163 |
case '?': /* "\?" */ |
164 |
case '*': /* "\*" */ |
165 |
case '@': /* "\@" */ |
166 |
case 'x': /* "\x" */ |
167 |
case 'X': /* "\X" */ |
168 |
case 'a': /* "\a" */ |
169 |
case 'A': /* "\A" */ |
170 |
case '-': /* "\-" */ |
171 |
if (pattern_type == -1) break; /* Must not contain pattern */ |
172 |
contains_pattern = 1; |
173 |
continue; |
174 |
case '0': /* "\ooo" */ |
175 |
case '1': |
176 |
case '2': |
177 |
case '3': |
178 |
if ((d = *filename++) >= '0' && d <= '7' && (e = *filename++) >= '0' && e <= '7') { |
179 |
const unsigned char f = |
180 |
(((unsigned char) (c - '0')) << 6) + |
181 |
(((unsigned char) (d - '0')) << 3) + |
182 |
(((unsigned char) (e - '0'))); |
183 |
if (f && (f <= ' ' || f >= 127)) continue; /* pattern is not \000 */ |
184 |
} |
185 |
} |
186 |
goto out; |
187 |
} else if (c <= ' ' || c >= 127) { |
188 |
goto out; |
189 |
} |
190 |
} |
191 |
if (pattern_type == 1) { /* Must contain pattern */ |
192 |
if (!contains_pattern) goto out; |
193 |
} |
194 |
return 1; |
195 |
out: |
196 |
printk(KERN_DEBUG "%s: Invalid pathname '%s'\n", function, original_filename); |
197 |
return 0; |
198 |
} |
199 |
|
200 |
/* |
201 |
* Check whether the given domainname follows the naming rules. |
202 |
* Returns nonzero if follows, zero otherwise. |
203 |
*/ |
204 |
bool IsCorrectDomain(const unsigned char *domainname, const char *function) |
205 |
{ |
206 |
unsigned char c, d, e; |
207 |
const char *org_domainname = domainname; |
208 |
if (!domainname || strncmp(domainname, ROOT_NAME, ROOT_NAME_LEN)) goto out; |
209 |
domainname += ROOT_NAME_LEN; |
210 |
if (!*domainname) return 1; |
211 |
do { |
212 |
if (*domainname++ != ' ') goto out; |
213 |
if (*domainname++ != '/') goto out; |
214 |
while ((c = *domainname) != '\0' && c != ' ') { |
215 |
domainname++; |
216 |
if (c == '\\') { |
217 |
switch ((c = *domainname++)) { |
218 |
case '\\': /* "\\" */ |
219 |
continue; |
220 |
case '0': /* "\ooo" */ |
221 |
case '1': |
222 |
case '2': |
223 |
case '3': |
224 |
if ((d = *domainname++) >= '0' && d <= '7' && (e = *domainname++) >= '0' && e <= '7') { |
225 |
const unsigned char f = |
226 |
(((unsigned char) (c - '0')) << 6) + |
227 |
(((unsigned char) (d - '0')) << 3) + |
228 |
(((unsigned char) (e - '0'))); |
229 |
if (f && (f <= ' ' || f >= 127)) continue; /* pattern is not \000 */ |
230 |
} |
231 |
} |
232 |
goto out; |
233 |
} else if (c < ' ' || c >= 127) { |
234 |
goto out; |
235 |
} |
236 |
} |
237 |
} while (*domainname); |
238 |
return 1; |
239 |
out: |
240 |
printk(KERN_DEBUG "%s: Invalid domainname '%s'\n", function, org_domainname); |
241 |
return 0; |
242 |
} |
243 |
|
244 |
bool IsDomainDef(const unsigned char *buffer) |
245 |
{ |
246 |
/* while (*buffer && (*buffer <= ' ' || *buffer >= 127)) buffer++; */ |
247 |
return strncmp(buffer, ROOT_NAME, ROOT_NAME_LEN) == 0; |
248 |
} |
249 |
|
250 |
struct domain_info *FindDomain(const char *domainname0) |
251 |
{ |
252 |
struct domain_info *domain; |
253 |
struct path_info domainname; |
254 |
domainname.name = domainname0; |
255 |
fill_path_info(&domainname); |
256 |
list1_for_each_entry(domain, &domain_list, list) { |
257 |
if (!domain->is_deleted && !pathcmp(&domainname, domain->domainname)) return domain; |
258 |
} |
259 |
return NULL; |
260 |
} |
261 |
|
262 |
static int PathDepth(const char *pathname) |
263 |
{ |
264 |
int i = 0; |
265 |
if (pathname) { |
266 |
char *ep = strchr(pathname, '\0'); |
267 |
if (pathname < ep--) { |
268 |
if (*ep != '/') i++; |
269 |
while (pathname <= ep) if (*ep-- == '/') i += 2; |
270 |
} |
271 |
} |
272 |
return i; |
273 |
} |
274 |
|
275 |
static int const_part_length(const char *filename) |
276 |
{ |
277 |
int len = 0; |
278 |
if (filename) { |
279 |
char c; |
280 |
while ((c = *filename++) != '\0') { |
281 |
if (c != '\\') { len++; continue; } |
282 |
switch (c = *filename++) { |
283 |
case '\\': /* "\\" */ |
284 |
len += 2; continue; |
285 |
case '0': /* "\ooo" */ |
286 |
case '1': |
287 |
case '2': |
288 |
case '3': |
289 |
if ((c = *filename++) >= '0' && c <= '7' && (c = *filename++) >= '0' && c <= '7') { len += 4; continue; } |
290 |
} |
291 |
break; |
292 |
} |
293 |
} |
294 |
return len; |
295 |
} |
296 |
|
297 |
void fill_path_info(struct path_info *ptr) |
298 |
{ |
299 |
const char *name = ptr->name; |
300 |
const int len = strlen(name); |
301 |
ptr->total_len = len; |
302 |
ptr->const_len = const_part_length(name); |
303 |
ptr->is_dir = len && (name[len - 1] == '/'); |
304 |
ptr->is_patterned = (ptr->const_len < len); |
305 |
ptr->hash = full_name_hash(name, len); |
306 |
ptr->depth = PathDepth(name); |
307 |
} |
308 |
|
309 |
static int FileMatchesToPattern2(const char *filename, const char *filename_end, const char *pattern, const char *pattern_end) |
310 |
{ |
311 |
while (filename < filename_end && pattern < pattern_end) { |
312 |
if (*pattern != '\\') { |
313 |
if (*filename++ != *pattern++) return 0; |
314 |
} else { |
315 |
char c = *filename; |
316 |
pattern++; |
317 |
switch (*pattern) { |
318 |
case '?': |
319 |
if (c == '/') { |
320 |
return 0; |
321 |
} else if (c == '\\') { |
322 |
if ((c = filename[1]) == '\\') { |
323 |
filename++; /* safe because filename is \\ */ |
324 |
} else if (c >= '0' && c <= '3' && (c = filename[2]) >= '0' && c <= '7' && (c = filename[3]) >= '0' && c <= '7') { |
325 |
filename += 3; /* safe because filename is \ooo */ |
326 |
} else { |
327 |
return 0; |
328 |
} |
329 |
} |
330 |
break; |
331 |
case '\\': |
332 |
if (c != '\\') return 0; |
333 |
if (*++filename != '\\') return 0; /* safe because *filename != '\0' */ |
334 |
break; |
335 |
case '+': |
336 |
if (c < '0' || c > '9') return 0; |
337 |
break; |
338 |
case 'x': |
339 |
if (!((c >= '0' && c <= '9') || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f'))) return 0; |
340 |
break; |
341 |
case 'a': |
342 |
if (!((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'))) return 0; |
343 |
break; |
344 |
case '0': |
345 |
case '1': |
346 |
case '2': |
347 |
case '3': |
348 |
if (c == '\\' && (c = filename[1]) >= '0' && c <= '3' && c == *pattern |
349 |
&& (c = filename[2]) >= '0' && c <= '7' && c == pattern[1] |
350 |
&& (c = filename[3]) >= '0' && c <= '7' && c == pattern[2]) { |
351 |
filename += 3; /* safe because filename is \ooo */ |
352 |
pattern += 2; /* safe because pattern is \ooo */ |
353 |
break; |
354 |
} |
355 |
return 0; /* Not matched. */ |
356 |
case '*': |
357 |
case '@': |
358 |
{ |
359 |
int i; |
360 |
for (i = 0; i <= filename_end - filename; i++) { |
361 |
if (FileMatchesToPattern2(filename + i, filename_end, pattern + 1, pattern_end)) return 1; |
362 |
if ((c = filename[i]) == '.' && *pattern == '@') break; |
363 |
if (c == '\\') { |
364 |
if ((c = filename[i + 1]) == '\\') { |
365 |
i++; /* safe because filename is \\ */ |
366 |
} else if (c >= '0' && c <= '3' && (c = filename[i + 2]) >= '0' && c <= '7' && (c = filename[i + 3]) >= '0' && c <= '7') { |
367 |
i += 3; /* safe because filename is \ooo */ |
368 |
} else { |
369 |
break; /* Bad pattern. */ |
370 |
} |
371 |
} |
372 |
} |
373 |
return 0; /* Not matched. */ |
374 |
} |
375 |
default: |
376 |
{ |
377 |
int i, j = 0; |
378 |
if ((c = *pattern) == '$') { |
379 |
while ((c = filename[j]) >= '0' && c <= '9') j++; |
380 |
} else if (c == 'X') { |
381 |
while (((c = filename[j]) >= '0' && c <= '9') || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f')) j++; |
382 |
} else if (c == 'A') { |
383 |
while (((c = filename[j]) >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')) j++; |
384 |
} |
385 |
for (i = 1; i <= j; i++) { |
386 |
if (FileMatchesToPattern2(filename + i, filename_end, pattern + 1, pattern_end)) return 1; |
387 |
} |
388 |
} |
389 |
return 0; /* Not matched or bad pattern. */ |
390 |
} |
391 |
filename++; /* safe because *filename != '\0' */ |
392 |
pattern++; /* safe because *pattern != '\0' */ |
393 |
} |
394 |
} |
395 |
while (*pattern == '\\' && (*(pattern + 1) == '*' || *(pattern + 1) == '@')) pattern += 2; |
396 |
return (filename == filename_end && pattern == pattern_end); |
397 |
} |
398 |
|
399 |
static int FileMatchesToPattern(const char *filename, const char *filename_end, const char *pattern, const char *pattern_end) |
400 |
{ |
401 |
const char *pattern_start = pattern; |
402 |
int first = 1; |
403 |
int result; |
404 |
while (pattern < pattern_end - 1) { |
405 |
if (*pattern++ != '\\' || *pattern++ != '-') continue; |
406 |
result = FileMatchesToPattern2(filename, filename_end, pattern_start, pattern - 2); |
407 |
if (first) result = !result; |
408 |
if (result) return 0; |
409 |
first = 0; |
410 |
pattern_start = pattern; |
411 |
} |
412 |
result = FileMatchesToPattern2(filename, filename_end, pattern_start, pattern_end); |
413 |
return first ? result : !result; |
414 |
} |
415 |
|
416 |
/* |
417 |
* Check whether the given pathname matches to the given pattern. |
418 |
* Returns nonzero if matches, zero otherwise. |
419 |
* |
420 |
* The following patterns are available. |
421 |
* \\ \ itself. |
422 |
* \ooo Octal representation of a byte. |
423 |
* \* More than or equals to 0 character other than '/'. |
424 |
* \@ More than or equals to 0 character other than '/' or '.'. |
425 |
* \? 1 byte character other than '/'. |
426 |
* \$ More than or equals to 1 decimal digit. |
427 |
* \+ 1 decimal digit. |
428 |
* \X More than or equals to 1 hexadecimal digit. |
429 |
* \x 1 hexadecimal digit. |
430 |
* \A More than or equals to 1 alphabet character. |
431 |
* \a 1 alphabet character. |
432 |
* \- Subtraction operator. |
433 |
*/ |
434 |
|
435 |
int PathMatchesToPattern(const struct path_info *pathname0, const struct path_info *pattern0) |
436 |
{ |
437 |
/* if (!pathname || !pattern) return 0; */ |
438 |
const char *pathname = pathname0->name, *pattern = pattern0->name; |
439 |
const int len = pattern0->const_len; |
440 |
if (!pattern0->is_patterned) return !pathcmp(pathname0, pattern0); |
441 |
if (pathname0->depth != pattern0->depth) return 0; |
442 |
if (strncmp(pathname, pattern, len)) return 0; |
443 |
pathname += len; pattern += len; |
444 |
while (*pathname && *pattern) { |
445 |
const char *pathname_delimiter = strchr(pathname, '/'), *pattern_delimiter = strchr(pattern, '/'); |
446 |
if (!pathname_delimiter) pathname_delimiter = strchr(pathname, '\0'); |
447 |
if (!pattern_delimiter) pattern_delimiter = strchr(pattern, '\0'); |
448 |
if (!FileMatchesToPattern(pathname, pathname_delimiter, pattern, pattern_delimiter)) return 0; |
449 |
pathname = *pathname_delimiter ? pathname_delimiter + 1 : pathname_delimiter; |
450 |
pattern = *pattern_delimiter ? pattern_delimiter + 1 : pattern_delimiter; |
451 |
} |
452 |
while (*pattern == '\\' && (*(pattern + 1) == '*' || *(pattern + 1) == '@')) pattern += 2; |
453 |
return (!*pathname && !*pattern); |
454 |
} |
455 |
|
456 |
/* |
457 |
* Transactional printf() to struct io_buffer structure. |
458 |
* snprintf() will truncate, but io_printf() won't. |
459 |
* Returns zero on success, nonzero otherwise. |
460 |
*/ |
461 |
int io_printf(struct io_buffer *head, const char *fmt, ...) |
462 |
{ |
463 |
va_list args; |
464 |
int len, pos = head->read_avail, size = head->readbuf_size - pos; |
465 |
if (size <= 0) return -ENOMEM; |
466 |
va_start(args, fmt); |
467 |
len = vsnprintf(head->read_buf + pos, size, fmt, args); |
468 |
va_end(args); |
469 |
if (pos + len >= head->readbuf_size) return -ENOMEM; |
470 |
head->read_avail += len; |
471 |
return 0; |
472 |
} |
473 |
|
474 |
/* |
475 |
* Get realpath() of current process. |
476 |
* This function uses ccs_alloc(), so caller must ccs_free() if this function didn't return NULL. |
477 |
*/ |
478 |
const char *GetEXE(void) |
479 |
{ |
480 |
struct mm_struct *mm = current->mm; |
481 |
struct vm_area_struct *vma; |
482 |
const char *cp = NULL; |
483 |
if (!mm) return NULL; |
484 |
down_read(&mm->mmap_sem); |
485 |
for (vma = mm->mmap; vma; vma = vma->vm_next) { |
486 |
if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) { |
487 |
cp = realpath_from_dentry(vma->vm_file->f_dentry, vma->vm_file->f_vfsmnt); |
488 |
break; |
489 |
} |
490 |
} |
491 |
up_read(&mm->mmap_sem); |
492 |
return cp; |
493 |
} |
494 |
|
495 |
const char *GetMSG(const bool is_enforce) |
496 |
{ |
497 |
if (is_enforce) return "ERROR"; else return "WARNING"; |
498 |
} |
499 |
|
500 |
const char *GetAltExec(void) |
501 |
{ |
502 |
const u8 profile = current->domain_info->profile; |
503 |
const struct path_info *alt_exec = profile_ptr[profile] ? profile_ptr[profile]->alt_exec : NULL; |
504 |
return alt_exec ? alt_exec->name : NULL; |
505 |
} |
506 |
|
507 |
/************************* DOMAIN POLICY HANDLER *************************/ |
508 |
|
509 |
/* Check whether the given access control is enabled. */ |
510 |
unsigned int CheckCCSFlags_NoSleepCheck(const u8 index) |
511 |
{ |
512 |
const u8 profile = current->domain_info->profile; |
513 |
return sbin_init_started && index < CCS_MAX_CONTROL_INDEX |
514 |
#if MAX_PROFILES != 256 |
515 |
&& profile < MAX_PROFILES |
516 |
#endif |
517 |
&& profile_ptr[profile] ? profile_ptr[profile]->value[index] : 0; |
518 |
} |
519 |
|
520 |
unsigned int CheckCCSFlags(const u8 index) |
521 |
{ |
522 |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) |
523 |
if (unlikely(in_interrupt())) |
524 |
#else |
525 |
if (unlikely(in_atomic())) |
526 |
#endif |
527 |
{ |
528 |
static u8 count = 20; |
529 |
if (count) { |
530 |
count--; |
531 |
printk(KERN_ERR "BUG: sleeping function called from invalid context.\n"); |
532 |
dump_stack(); |
533 |
} |
534 |
/* Return 0 so that no MAC checks are performed. */ |
535 |
return 0; |
536 |
} |
537 |
return CheckCCSFlags_NoSleepCheck(index); |
538 |
} |
539 |
|
540 |
bool TomoyoVerboseMode(void) |
541 |
{ |
542 |
return CheckCCSFlags(CCS_TOMOYO_VERBOSE) != 0; |
543 |
} |
544 |
|
545 |
bool CheckDomainQuota(struct domain_info * const domain) |
546 |
{ |
547 |
unsigned int count = 0; |
548 |
struct acl_info *ptr; |
549 |
if (!domain) return 1; |
550 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
551 |
if (!(ptr->type & ACL_DELETED)) count++; |
552 |
} |
553 |
if (count < CheckCCSFlags(CCS_TOMOYO_MAX_ACCEPT_ENTRY)) return 1; |
554 |
if (!domain->quota_warned) { |
555 |
domain->quota_warned = 1; |
556 |
printk("TOMOYO-WARNING: Domain '%s' has so many ACLs to hold. Stopped learning mode.\n", domain->domainname->name); |
557 |
} |
558 |
return 0; |
559 |
} |
560 |
|
561 |
static struct profile *FindOrAssignNewProfile(const unsigned int profile) |
562 |
{ |
563 |
static DEFINE_MUTEX(profile_lock); |
564 |
struct profile *ptr = NULL; |
565 |
mutex_lock(&profile_lock); |
566 |
if (profile < MAX_PROFILES && (ptr = profile_ptr[profile]) == NULL) { |
567 |
if ((ptr = alloc_element(sizeof(*ptr))) != NULL) { |
568 |
int i; |
569 |
for (i = 0; i < CCS_MAX_CONTROL_INDEX; i++) ptr->value[i] = ccs_control_array[i].current_value; |
570 |
mb(); /* Avoid out-of-order execution. */ |
571 |
profile_ptr[profile] = ptr; |
572 |
} |
573 |
} |
574 |
mutex_unlock(&profile_lock); |
575 |
return ptr; |
576 |
} |
577 |
|
578 |
/* #define ALT_EXEC */ |
579 |
|
580 |
static int SetProfile(struct io_buffer *head) |
581 |
{ |
582 |
char *data = head->write_buf; |
583 |
unsigned int i, value; |
584 |
char *cp; |
585 |
struct profile *profile; |
586 |
if (!isRoot(head)) return -EPERM; |
587 |
i = simple_strtoul(data, &cp, 10); |
588 |
if (data != cp) { |
589 |
if (*cp != '-') return -EINVAL; |
590 |
data= cp + 1; |
591 |
} |
592 |
profile = FindOrAssignNewProfile(i); |
593 |
if (!profile) return -EINVAL; |
594 |
cp = strchr(data, '='); |
595 |
if (!cp) return -EINVAL; |
596 |
*cp = '\0'; |
597 |
UpdateCounter(CCS_UPDATES_COUNTER_PROFILE); |
598 |
if (strcmp(data, ccs_control_array[CCS_PROFILE_COMMENT].keyword) == 0) { |
599 |
profile->comment = SaveName(cp + 1); |
600 |
return 0; |
601 |
} |
602 |
#ifdef ALT_EXEC |
603 |
#ifdef CONFIG_TOMOYO |
604 |
if (strcmp(data, ccs_control_array[CCS_TOMOYO_ALT_EXEC].keyword) == 0) { |
605 |
cp++; |
606 |
if (*cp && !IsCorrectPath(cp, 1, -1, -1, __FUNCTION__)) cp = ""; |
607 |
profile->alt_exec = SaveName(cp); |
608 |
return 0; |
609 |
} |
610 |
#endif |
611 |
#endif |
612 |
if (sscanf(cp + 1, "%u", &value) != 1) return -EINVAL; |
613 |
#ifdef CONFIG_TOMOYO |
614 |
if (strncmp(data, KEYWORD_MAC_FOR_CAPABILITY, KEYWORD_MAC_FOR_CAPABILITY_LEN) == 0) { |
615 |
return SetCapabilityStatus(data + KEYWORD_MAC_FOR_CAPABILITY_LEN, value, i); |
616 |
} |
617 |
#endif |
618 |
for (i = 0; i < CCS_MAX_CONTROL_INDEX; i++) { |
619 |
if (strcmp(data, ccs_control_array[i].keyword)) continue; |
620 |
if (value > ccs_control_array[i].max_value) value = ccs_control_array[i].max_value; |
621 |
profile->value[i] = value; |
622 |
return 0; |
623 |
} |
624 |
return -EINVAL; |
625 |
} |
626 |
|
627 |
static int ReadProfile(struct io_buffer *head) |
628 |
{ |
629 |
if (!head->read_eof) { |
630 |
if (!isRoot(head)) return -EPERM; |
631 |
if (!head->read_var2) { |
632 |
int step; |
633 |
for (step = head->read_step; step < MAX_PROFILES * CCS_MAX_CONTROL_INDEX; step++) { |
634 |
const int i = step / CCS_MAX_CONTROL_INDEX, j = step % CCS_MAX_CONTROL_INDEX; |
635 |
const struct profile *profile = profile_ptr[i]; |
636 |
head->read_step = step; |
637 |
if (!profile) continue; |
638 |
switch (j) { |
639 |
case -1: /* Dummy */ |
640 |
#ifndef CONFIG_SAKURA |
641 |
case CCS_SAKURA_DENY_CONCEAL_MOUNT: |
642 |
case CCS_SAKURA_RESTRICT_CHROOT: |
643 |
case CCS_SAKURA_RESTRICT_MOUNT: |
644 |
case CCS_SAKURA_RESTRICT_UNMOUNT: |
645 |
case CCS_SAKURA_RESTRICT_PIVOT_ROOT: |
646 |
case CCS_SAKURA_RESTRICT_AUTOBIND: |
647 |
#endif |
648 |
#ifndef CONFIG_TOMOYO |
649 |
case CCS_TOMOYO_MAC_FOR_FILE: |
650 |
case CCS_TOMOYO_MAC_FOR_ARGV0: |
651 |
case CCS_TOMOYO_MAC_FOR_ENV: |
652 |
case CCS_TOMOYO_MAC_FOR_NETWORK: |
653 |
case CCS_TOMOYO_MAC_FOR_SIGNAL: |
654 |
case CCS_TOMOYO_MAX_ACCEPT_ENTRY: |
655 |
case CCS_TOMOYO_MAX_GRANT_LOG: |
656 |
case CCS_TOMOYO_MAX_REJECT_LOG: |
657 |
case CCS_TOMOYO_VERBOSE: |
658 |
#endif |
659 |
#ifndef ALT_EXEC |
660 |
case CCS_TOMOYO_ALT_EXEC: |
661 |
case CCS_SLEEP_PERIOD: |
662 |
#endif |
663 |
continue; |
664 |
} |
665 |
if (j == CCS_PROFILE_COMMENT) { |
666 |
if (io_printf(head, "%u-%s=%s\n", i, ccs_control_array[CCS_PROFILE_COMMENT].keyword, profile->comment ? profile->comment->name : "")) break; |
667 |
} else if (j == CCS_TOMOYO_ALT_EXEC) { |
668 |
const struct path_info *alt_exec = profile->alt_exec; |
669 |
if (io_printf(head, "%u-%s=%s\n", i, ccs_control_array[CCS_TOMOYO_ALT_EXEC].keyword, alt_exec ? alt_exec->name : "")) break; |
670 |
} else { |
671 |
if (io_printf(head, "%u-%s=%u\n", i, ccs_control_array[j].keyword, profile->value[j])) break; |
672 |
} |
673 |
} |
674 |
if (step == MAX_PROFILES * CCS_MAX_CONTROL_INDEX) { |
675 |
head->read_var2 = (void *) ""; |
676 |
head->read_step = 0; |
677 |
} |
678 |
} |
679 |
if (head->read_var2) { |
680 |
#ifdef CONFIG_TOMOYO |
681 |
if (ReadCapabilityStatus(head) == 0) |
682 |
#endif |
683 |
head->read_eof = 1; |
684 |
} |
685 |
} |
686 |
return 0; |
687 |
} |
688 |
|
689 |
/************************* POLICY MANAGER HANDLER *************************/ |
690 |
|
691 |
struct policy_manager_entry { |
692 |
struct list1_head list; |
693 |
const struct path_info *manager; |
694 |
bool is_domain; |
695 |
bool is_deleted; |
696 |
}; |
697 |
|
698 |
static LIST1_HEAD(policy_manager_list); |
699 |
|
700 |
static int AddManagerEntry(const char *manager, const bool is_delete) |
701 |
{ |
702 |
struct policy_manager_entry *new_entry, *ptr; |
703 |
static DEFINE_MUTEX(lock); |
704 |
const struct path_info *saved_manager; |
705 |
int error = -ENOMEM; |
706 |
bool is_domain = 0; |
707 |
if (IsDomainDef(manager)) { |
708 |
if (!IsCorrectDomain(manager, __FUNCTION__)) return -EINVAL; |
709 |
is_domain = 1; |
710 |
} else { |
711 |
if (!IsCorrectPath(manager, 1, -1, -1, __FUNCTION__)) return -EINVAL; |
712 |
} |
713 |
if ((saved_manager = SaveName(manager)) == NULL) return -ENOMEM; |
714 |
mutex_lock(&lock); |
715 |
list1_for_each_entry(ptr, &policy_manager_list, list) { |
716 |
if (ptr->manager == saved_manager) { |
717 |
ptr->is_deleted = is_delete; |
718 |
error = 0; |
719 |
goto out; |
720 |
} |
721 |
} |
722 |
if (is_delete) { |
723 |
error = -ENOENT; |
724 |
goto out; |
725 |
} |
726 |
if ((new_entry = alloc_element(sizeof(*new_entry))) == NULL) goto out; |
727 |
new_entry->manager = saved_manager; |
728 |
new_entry->is_domain = is_domain; |
729 |
list1_add_tail_mb(&new_entry->list, &policy_manager_list); |
730 |
error = 0; |
731 |
out: |
732 |
mutex_unlock(&lock); |
733 |
if (!error) UpdateCounter(CCS_UPDATES_COUNTER_MANAGER); |
734 |
return error; |
735 |
} |
736 |
|
737 |
static int AddManagerPolicy(struct io_buffer *head) |
738 |
{ |
739 |
const char *data = head->write_buf; |
740 |
bool is_delete = 0; |
741 |
if (!isRoot(head)) return -EPERM; |
742 |
if (strncmp(data, KEYWORD_DELETE, KEYWORD_DELETE_LEN) == 0) { |
743 |
data += KEYWORD_DELETE_LEN; |
744 |
is_delete = 1; |
745 |
} |
746 |
return AddManagerEntry(data, is_delete); |
747 |
} |
748 |
|
749 |
static int ReadManagerPolicy(struct io_buffer *head) |
750 |
{ |
751 |
struct list1_head *pos; |
752 |
if (head->read_eof) return 0; |
753 |
if (!isRoot(head)) return -EPERM; |
754 |
list1_for_each_cookie(pos, head->read_var2, &policy_manager_list) { |
755 |
struct policy_manager_entry *ptr; |
756 |
ptr = list1_entry(pos, struct policy_manager_entry, list); |
757 |
if (ptr->is_deleted) continue; |
758 |
if (io_printf(head, "%s\n", ptr->manager->name)) return 0; |
759 |
} |
760 |
head->read_eof = 1; |
761 |
return 0; |
762 |
} |
763 |
|
764 |
/* Check whether the current process is a policy manager. */ |
765 |
static int IsPolicyManager(void) |
766 |
{ |
767 |
struct policy_manager_entry *ptr; |
768 |
const char *exe; |
769 |
const struct path_info *domainname = current->domain_info->domainname; |
770 |
bool found = 0; |
771 |
if (!sbin_init_started) return 1; |
772 |
list1_for_each_entry(ptr, &policy_manager_list, list) { |
773 |
if (!ptr->is_deleted && ptr->is_domain && !pathcmp(domainname, ptr->manager)) return 1; |
774 |
} |
775 |
if ((exe = GetEXE()) == NULL) return 0; |
776 |
list1_for_each_entry(ptr, &policy_manager_list, list) { |
777 |
if (!ptr->is_deleted && !ptr->is_domain && !strcmp(exe, ptr->manager->name)) { |
778 |
found = 1; |
779 |
break; |
780 |
} |
781 |
} |
782 |
if (!found) { /* Reduce error messages. */ |
783 |
static pid_t last_pid = 0; |
784 |
const pid_t pid = current->pid; |
785 |
if (last_pid != pid) { |
786 |
printk("%s ( %s ) is not permitted to update policies.\n", domainname->name, exe); |
787 |
last_pid = pid; |
788 |
} |
789 |
} |
790 |
ccs_free(exe); |
791 |
return found; |
792 |
} |
793 |
|
794 |
#ifdef CONFIG_TOMOYO |
795 |
|
796 |
/************************* DOMAIN POLICY HANDLER *************************/ |
797 |
|
798 |
static char *FindConditionPart(char *data) |
799 |
{ |
800 |
char *cp = strstr(data, " if "), *cp2; |
801 |
if (cp) { |
802 |
while ((cp2 = strstr(cp + 3, " if ")) != NULL) cp = cp2; |
803 |
*cp++ = '\0'; |
804 |
} else if ((cp = strstr(data, " ; set ")) != NULL) { |
805 |
*cp++ = '\0'; |
806 |
} |
807 |
return cp; |
808 |
} |
809 |
|
810 |
static int AddDomainPolicy(struct io_buffer *head) |
811 |
{ |
812 |
char *data = head->write_buf; |
813 |
struct domain_info *domain = head->write_var1; |
814 |
bool is_delete = 0, is_select = 0, is_undelete = 0; |
815 |
unsigned int profile; |
816 |
const struct condition_list *cond = NULL; |
817 |
char *cp; |
818 |
if (!isRoot(head)) return -EPERM; |
819 |
if (strncmp(data, KEYWORD_DELETE, KEYWORD_DELETE_LEN) == 0) { |
820 |
data += KEYWORD_DELETE_LEN; |
821 |
is_delete = 1; |
822 |
} else if (strncmp(data, KEYWORD_SELECT, KEYWORD_SELECT_LEN) == 0) { |
823 |
data += KEYWORD_SELECT_LEN; |
824 |
is_select = 1; |
825 |
} else if (strncmp(data, KEYWORD_UNDELETE, KEYWORD_UNDELETE_LEN) == 0) { |
826 |
data += KEYWORD_UNDELETE_LEN; |
827 |
is_undelete = 1; |
828 |
} |
829 |
if (IsDomainDef(data)) { |
830 |
if (is_delete) { |
831 |
DeleteDomain(data); |
832 |
domain = NULL; |
833 |
} else if (is_select) { |
834 |
domain = FindDomain(data); |
835 |
} else if (is_undelete) { |
836 |
domain = UndeleteDomain(data); |
837 |
} else { |
838 |
domain = FindOrAssignNewDomain(data, 0); |
839 |
} |
840 |
head->write_var1 = domain; |
841 |
UpdateCounter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
842 |
return 0; |
843 |
} |
844 |
if (!domain) return -EINVAL; |
845 |
|
846 |
if (sscanf(data, KEYWORD_USE_PROFILE "%u", &profile) == 1 && profile < MAX_PROFILES) { |
847 |
if (profile_ptr[profile] || !sbin_init_started) domain->profile = (u8) profile; |
848 |
return 0; |
849 |
} |
850 |
cp = FindConditionPart(data); |
851 |
if (cp && (cond = FindOrAssignNewCondition(cp)) == NULL) return -EINVAL; |
852 |
if (strncmp(data, KEYWORD_ALLOW_CAPABILITY, KEYWORD_ALLOW_CAPABILITY_LEN) == 0) { |
853 |
return AddCapabilityPolicy(data + KEYWORD_ALLOW_CAPABILITY_LEN, domain, cond, is_delete); |
854 |
} else if (strncmp(data, KEYWORD_ALLOW_NETWORK, KEYWORD_ALLOW_NETWORK_LEN) == 0) { |
855 |
return AddNetworkPolicy(data + KEYWORD_ALLOW_NETWORK_LEN, domain, cond, is_delete); |
856 |
} else if (strncmp(data, KEYWORD_ALLOW_SIGNAL, KEYWORD_ALLOW_SIGNAL_LEN) == 0) { |
857 |
return AddSignalPolicy(data + KEYWORD_ALLOW_SIGNAL_LEN, domain, cond, is_delete); |
858 |
} else if (strncmp(data, KEYWORD_ALLOW_ARGV0, KEYWORD_ALLOW_ARGV0_LEN) == 0) { |
859 |
return AddArgv0Policy(data + KEYWORD_ALLOW_ARGV0_LEN, domain, cond, is_delete); |
860 |
} else if (strncmp(data, KEYWORD_ALLOW_ENV, KEYWORD_ALLOW_ENV_LEN) == 0) { |
861 |
return AddEnvPolicy(data + KEYWORD_ALLOW_ENV_LEN, domain, cond, is_delete); |
862 |
} else { |
863 |
return AddFilePolicy(data, domain, cond, is_delete); |
864 |
} |
865 |
return -EINVAL; |
866 |
} |
867 |
|
868 |
static bool print_single_path_acl(struct io_buffer *head, struct single_path_acl_record *ptr, const struct condition_list *cond) |
869 |
{ |
870 |
int pos; |
871 |
u8 bit; |
872 |
const bool b = ptr->u_is_group; |
873 |
const u16 perm = ptr->perm; |
874 |
for (bit = head->read_bit; bit < MAX_SINGLE_PATH_OPERATION; bit++) { |
875 |
const char *msg; |
876 |
if (!(perm & (1 << bit))) continue; |
877 |
/* Print "read/write" instead of "read" and "write". */ |
878 |
if ((bit == TYPE_READ_ACL || bit == TYPE_WRITE_ACL) && (perm & (1 << TYPE_READ_WRITE_ACL))) continue; |
879 |
msg = sp_operation2keyword(bit); |
880 |
pos = head->read_avail; |
881 |
if (b && io_printf(head, "allow_%s @%s ", msg, ptr->u.group->group_name->name)) goto out; |
882 |
if (!b && io_printf(head, "allow_%s %s ", msg, ptr->u.filename->name)) goto out; |
883 |
if (DumpCondition(head, cond)) goto out; |
884 |
} |
885 |
head->read_bit = 0; |
886 |
return 1; |
887 |
out: |
888 |
head->read_bit = bit; |
889 |
head->read_avail = pos; |
890 |
return 0; |
891 |
} |
892 |
|
893 |
static bool print_double_path_acl(struct io_buffer *head, struct double_path_acl_record *ptr, const struct condition_list *cond) |
894 |
{ |
895 |
int pos; |
896 |
const bool b0 = ptr->u1_is_group, b1 = ptr->u2_is_group; |
897 |
const u8 perm = ptr->perm; |
898 |
u8 bit; |
899 |
for (bit = head->read_bit; bit < MAX_DOUBLE_PATH_OPERATION; bit++) { |
900 |
const char *msg; |
901 |
if (!(perm & (1 << bit))) continue; |
902 |
msg = dp_operation2keyword(bit); |
903 |
pos = head->read_avail; |
904 |
if (io_printf(head, "allow_%s ", msg)) goto out; |
905 |
if (b0 && io_printf(head, "@%s ", ptr->u1.group1->group_name->name)) goto out; |
906 |
if (!b0 && io_printf(head, "%s ", ptr->u1.filename1->name)) goto out; |
907 |
if (b1 && io_printf(head, "@%s", ptr->u2.group2->group_name->name)) goto out; |
908 |
if (!b1 && io_printf(head, "%s", ptr->u2.filename2->name)) goto out; |
909 |
if (DumpCondition(head, cond)) goto out; |
910 |
} |
911 |
head->read_bit = 0; |
912 |
return 1; |
913 |
out: |
914 |
head->read_bit = bit; |
915 |
head->read_avail = pos; |
916 |
return 0; |
917 |
} |
918 |
|
919 |
static bool print_argv0_acl(struct io_buffer *head, struct argv0_acl_record *ptr, const struct condition_list *cond) |
920 |
{ |
921 |
int pos = head->read_avail; |
922 |
if (io_printf(head, KEYWORD_ALLOW_ARGV0 "%s %s", |
923 |
ptr->filename->name, ptr->argv0->name)) goto out; |
924 |
if (DumpCondition(head, cond)) goto out; |
925 |
return 1; |
926 |
out: |
927 |
head->read_avail = pos; |
928 |
return 0; |
929 |
} |
930 |
|
931 |
static bool print_env_acl(struct io_buffer *head, struct env_acl_record *ptr, const struct condition_list *cond) |
932 |
{ |
933 |
int pos = head->read_avail; |
934 |
if (io_printf(head, KEYWORD_ALLOW_ENV "%s", ptr->env->name)) goto out; |
935 |
if (DumpCondition(head, cond)) goto out; |
936 |
return 1; |
937 |
out: |
938 |
head->read_avail = pos; |
939 |
return 0; |
940 |
} |
941 |
|
942 |
static bool print_capability_acl(struct io_buffer *head, struct capability_acl_record *ptr, const struct condition_list *cond) |
943 |
{ |
944 |
int pos = head->read_avail; |
945 |
if (io_printf(head, KEYWORD_ALLOW_CAPABILITY "%s", cap_operation2keyword(ptr->operation))) goto out; |
946 |
if (DumpCondition(head, cond)) goto out; |
947 |
return 1; |
948 |
out: |
949 |
head->read_avail = pos; |
950 |
return 0; |
951 |
} |
952 |
|
953 |
static bool print_network_acl(struct io_buffer *head, struct ip_network_acl_record *ptr, const struct condition_list *cond) |
954 |
{ |
955 |
int pos = head->read_avail; |
956 |
if (io_printf(head, KEYWORD_ALLOW_NETWORK "%s ", net_operation2keyword(ptr->operation_type))) goto out; |
957 |
switch (ptr->record_type) { |
958 |
case IP_RECORD_TYPE_ADDRESS_GROUP: |
959 |
if (io_printf(head, "@%s", ptr->u.group->group_name->name)) goto out; |
960 |
break; |
961 |
case IP_RECORD_TYPE_IPv4: |
962 |
{ |
963 |
const u32 min_address = ptr->u.ipv4.min, max_address = ptr->u.ipv4.max; |
964 |
if (io_printf(head, "%u.%u.%u.%u", HIPQUAD(min_address))) goto out; |
965 |
if (min_address != max_address && io_printf(head, "-%u.%u.%u.%u", HIPQUAD(max_address))) goto out; |
966 |
} |
967 |
break; |
968 |
case IP_RECORD_TYPE_IPv6: |
969 |
{ |
970 |
char buf[64]; |
971 |
const struct in6_addr *min_address = ptr->u.ipv6.min, *max_address = ptr->u.ipv6.max; |
972 |
print_ipv6(buf, sizeof(buf), min_address); |
973 |
if (io_printf(head, "%s", buf)) goto out; |
974 |
if (min_address != max_address) { |
975 |
print_ipv6(buf, sizeof(buf), max_address); |
976 |
if (io_printf(head, "-%s", buf)) goto out; |
977 |
} |
978 |
} |
979 |
break; |
980 |
} |
981 |
{ |
982 |
const u16 min_port = ptr->min_port, max_port = ptr->max_port; |
983 |
if (io_printf(head, " %u", min_port)) goto out; |
984 |
if (min_port != max_port && io_printf(head, "-%u", max_port)) goto out; |
985 |
} |
986 |
if (DumpCondition(head, cond)) goto out; |
987 |
return 1; |
988 |
out: |
989 |
head->read_avail = pos; |
990 |
return 0; |
991 |
} |
992 |
|
993 |
static bool print_signal_acl(struct io_buffer *head, struct signal_acl_record *ptr, const struct condition_list *cond) |
994 |
{ |
995 |
int pos = head->read_avail; |
996 |
if (io_printf(head, KEYWORD_ALLOW_SIGNAL "%u %s", ptr->sig, ptr->domainname->name)) goto out; |
997 |
if (DumpCondition(head, cond)) goto out; |
998 |
return 1; |
999 |
out: |
1000 |
head->read_avail = pos; |
1001 |
return 0; |
1002 |
} |
1003 |
|
1004 |
static int ReadDomainPolicy(struct io_buffer *head) |
1005 |
{ |
1006 |
struct list1_head *dpos; |
1007 |
struct list1_head *apos; |
1008 |
if (head->read_eof) return 0; |
1009 |
if (head->read_step == 0) { |
1010 |
if (!isRoot(head)) return -EPERM; |
1011 |
head->read_step = 1; |
1012 |
} |
1013 |
list1_for_each_cookie(dpos, head->read_var1, &domain_list) { |
1014 |
struct domain_info *domain; |
1015 |
domain = list1_entry(dpos, struct domain_info, list); |
1016 |
if (head->read_step != 1) goto acl_loop; |
1017 |
if (domain->is_deleted) continue; |
1018 |
if (io_printf(head, "%s\n" KEYWORD_USE_PROFILE "%u\n%s\n", domain->domainname->name, domain->profile, domain->quota_warned ? "quota_exceeded\n" : "")) return 0; |
1019 |
head->read_step = 2; |
1020 |
acl_loop: ; |
1021 |
if (head->read_step == 3) goto tail_mark; |
1022 |
list1_for_each_cookie(apos, head->read_var2, &domain->acl_info_list) { |
1023 |
struct acl_info *ptr; |
1024 |
u8 acl_type; |
1025 |
const struct condition_list *cond; |
1026 |
ptr = list1_entry(apos, struct acl_info, list); |
1027 |
cond = GetConditionPart(ptr); |
1028 |
acl_type = ptr->type & ~ACL_WITH_CONDITION; |
1029 |
if (acl_type & ACL_DELETED) { |
1030 |
/* Deleted entry. */ |
1031 |
} else if (acl_type == TYPE_SINGLE_PATH_ACL) { |
1032 |
if (!print_single_path_acl(head, container_of(ptr, struct single_path_acl_record, head), cond)) return 0; |
1033 |
} else if (acl_type == TYPE_DOUBLE_PATH_ACL) { |
1034 |
if (!print_double_path_acl(head, container_of(ptr, struct double_path_acl_record, head), cond)) return 0; |
1035 |
} else if (acl_type == TYPE_ARGV0_ACL) { |
1036 |
if (!print_argv0_acl(head, container_of(ptr, struct argv0_acl_record, head), cond)) return 0; |
1037 |
} else if (acl_type == TYPE_ENV_ACL) { |
1038 |
if (!print_env_acl(head, container_of(ptr, struct env_acl_record, head), cond)) return 0; |
1039 |
} else if (acl_type == TYPE_CAPABILITY_ACL) { |
1040 |
if (!print_capability_acl(head, container_of(ptr, struct capability_acl_record, head), cond)) return 0; |
1041 |
} else if (acl_type == TYPE_IP_NETWORK_ACL) { |
1042 |
if (!print_network_acl(head, container_of(ptr, struct ip_network_acl_record, head), cond)) return 0; |
1043 |
} else if (acl_type == TYPE_SIGNAL_ACL) { |
1044 |
if (!print_signal_acl(head, container_of(ptr, struct signal_acl_record, head), cond)) return 0; |
1045 |
} else { |
1046 |
BUG(); |
1047 |
} |
1048 |
} |
1049 |
head->read_step = 3; |
1050 |
tail_mark: ; |
1051 |
if (io_printf(head, "\n")) return 0; |
1052 |
head->read_step = 1; |
1053 |
} |
1054 |
head->read_eof = 1; |
1055 |
return 0; |
1056 |
} |
1057 |
|
1058 |
#endif |
1059 |
|
1060 |
static int UpdateDomainProfile(struct io_buffer *head) |
1061 |
{ |
1062 |
char *data = head->write_buf; |
1063 |
char *cp = strchr(data, ' '); |
1064 |
struct domain_info *domain; |
1065 |
unsigned int profile; |
1066 |
if (!isRoot(head)) return -EPERM; |
1067 |
if (!cp) return -EINVAL; |
1068 |
*cp = '\0'; |
1069 |
domain = FindDomain(cp + 1); |
1070 |
profile = simple_strtoul(data, NULL, 10); |
1071 |
if (domain && profile < MAX_PROFILES && (profile_ptr[profile] || !sbin_init_started)) domain->profile = (u8) profile; |
1072 |
UpdateCounter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
1073 |
return 0; |
1074 |
} |
1075 |
|
1076 |
static int ReadDomainProfile(struct io_buffer *head) |
1077 |
{ |
1078 |
struct list1_head *pos; |
1079 |
if (head->read_eof) return 0; |
1080 |
if (!isRoot(head)) return -EPERM; |
1081 |
list1_for_each_cookie(pos, head->read_var1, &domain_list) { |
1082 |
struct domain_info *domain; |
1083 |
domain = list1_entry(pos, struct domain_info, list); |
1084 |
if (domain->is_deleted) continue; |
1085 |
if (io_printf(head, "%u %s\n", domain->profile, domain->domainname->name)) return 0; |
1086 |
} |
1087 |
head->read_eof = 1; |
1088 |
return 0; |
1089 |
} |
1090 |
|
1091 |
static int WritePID(struct io_buffer *head) |
1092 |
{ |
1093 |
head->read_step = (int) simple_strtoul(head->write_buf, NULL, 10); |
1094 |
head->read_eof = 0; |
1095 |
return 0; |
1096 |
} |
1097 |
|
1098 |
static int ReadPID(struct io_buffer *head) |
1099 |
{ |
1100 |
if (head->read_avail == 0 && !head->read_eof) { |
1101 |
const int pid = head->read_step; |
1102 |
struct task_struct *p; |
1103 |
struct domain_info *domain = NULL; |
1104 |
/***** CRITICAL SECTION START *****/ |
1105 |
read_lock(&tasklist_lock); |
1106 |
p = find_task_by_pid(pid); |
1107 |
if (p) domain = p->domain_info; |
1108 |
read_unlock(&tasklist_lock); |
1109 |
/***** CRITICAL SECTION END *****/ |
1110 |
if (domain) io_printf(head, "%d %u %s", pid, domain->profile, domain->domainname->name); |
1111 |
head->read_eof = 1; |
1112 |
} |
1113 |
return 0; |
1114 |
} |
1115 |
|
1116 |
/************************* EXCEPTION POLICY HANDLER *************************/ |
1117 |
|
1118 |
#ifdef CONFIG_TOMOYO |
1119 |
|
1120 |
static int AddExceptionPolicy(struct io_buffer *head) |
1121 |
{ |
1122 |
char *data = head->write_buf; |
1123 |
bool is_delete = 0; |
1124 |
if (!isRoot(head)) return -EPERM; |
1125 |
UpdateCounter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
1126 |
if (strncmp(data, KEYWORD_DELETE, KEYWORD_DELETE_LEN) == 0) { |
1127 |
data += KEYWORD_DELETE_LEN; |
1128 |
is_delete = 1; |
1129 |
} |
1130 |
if (strncmp(data, KEYWORD_KEEP_DOMAIN, KEYWORD_KEEP_DOMAIN_LEN) == 0) { |
1131 |
return AddDomainKeeperPolicy(data + KEYWORD_KEEP_DOMAIN_LEN, 0, is_delete); |
1132 |
} else if (strncmp(data, KEYWORD_NO_KEEP_DOMAIN, KEYWORD_NO_KEEP_DOMAIN_LEN) == 0) { |
1133 |
return AddDomainKeeperPolicy(data + KEYWORD_NO_KEEP_DOMAIN_LEN, 1, is_delete); |
1134 |
} else if (strncmp(data, KEYWORD_INITIALIZE_DOMAIN, KEYWORD_INITIALIZE_DOMAIN_LEN) == 0) { |
1135 |
return AddDomainInitializerPolicy(data + KEYWORD_INITIALIZE_DOMAIN_LEN, 0, is_delete); |
1136 |
} else if (strncmp(data, KEYWORD_NO_INITIALIZE_DOMAIN, KEYWORD_NO_INITIALIZE_DOMAIN_LEN) == 0) { |
1137 |
return AddDomainInitializerPolicy(data + KEYWORD_NO_INITIALIZE_DOMAIN_LEN, 1, is_delete); |
1138 |
} else if (strncmp(data, KEYWORD_ALIAS, KEYWORD_ALIAS_LEN) == 0) { |
1139 |
return AddAliasPolicy(data + KEYWORD_ALIAS_LEN, is_delete); |
1140 |
} else if (strncmp(data, KEYWORD_AGGREGATOR, KEYWORD_AGGREGATOR_LEN) == 0) { |
1141 |
return AddAggregatorPolicy(data + KEYWORD_AGGREGATOR_LEN, is_delete); |
1142 |
} else if (strncmp(data, KEYWORD_ALLOW_READ, KEYWORD_ALLOW_READ_LEN) == 0) { |
1143 |
return AddGloballyReadablePolicy(data + KEYWORD_ALLOW_READ_LEN, is_delete); |
1144 |
} else if (strncmp(data, KEYWORD_ALLOW_ENV, KEYWORD_ALLOW_ENV_LEN) == 0) { |
1145 |
return AddGloballyUsableEnvPolicy(data + KEYWORD_ALLOW_ENV_LEN, is_delete); |
1146 |
} else if (strncmp(data, KEYWORD_FILE_PATTERN, KEYWORD_FILE_PATTERN_LEN) == 0) { |
1147 |
return AddFilePatternPolicy(data + KEYWORD_FILE_PATTERN_LEN, is_delete); |
1148 |
} else if (strncmp(data, KEYWORD_PATH_GROUP, KEYWORD_PATH_GROUP_LEN) == 0) { |
1149 |
return AddPathGroupPolicy(data + KEYWORD_PATH_GROUP_LEN, is_delete); |
1150 |
} else if (strncmp(data, KEYWORD_DENY_REWRITE, KEYWORD_DENY_REWRITE_LEN) == 0) { |
1151 |
return AddNoRewritePolicy(data + KEYWORD_DENY_REWRITE_LEN, is_delete); |
1152 |
} else if (strncmp(data, KEYWORD_ADDRESS_GROUP, KEYWORD_ADDRESS_GROUP_LEN) == 0) { |
1153 |
return AddAddressGroupPolicy(data + KEYWORD_ADDRESS_GROUP_LEN, is_delete); |
1154 |
} |
1155 |
return -EINVAL; |
1156 |
} |
1157 |
|
1158 |
static int ReadExceptionPolicy(struct io_buffer *head) |
1159 |
{ |
1160 |
if (!head->read_eof) { |
1161 |
switch (head->read_step) { |
1162 |
case 0: |
1163 |
if (!isRoot(head)) return -EPERM; |
1164 |
head->read_var2 = NULL; head->read_step = 1; |
1165 |
case 1: |
1166 |
if (ReadDomainKeeperPolicy(head)) break; |
1167 |
head->read_var2 = NULL; head->read_step = 2; |
1168 |
case 2: |
1169 |
if (ReadGloballyReadablePolicy(head)) break; |
1170 |
head->read_var2 = NULL; head->read_step = 3; |
1171 |
case 3: |
1172 |
if (ReadGloballyUsableEnvPolicy(head)) break; |
1173 |
head->read_var2 = NULL; head->read_step = 4; |
1174 |
case 4: |
1175 |
if (ReadDomainInitializerPolicy(head)) break; |
1176 |
head->read_var2 = NULL; head->read_step = 5; |
1177 |
case 5: |
1178 |
if (ReadAliasPolicy(head)) break; |
1179 |
head->read_var2 = NULL; head->read_step = 6; |
1180 |
case 6: |
1181 |
if (ReadAggregatorPolicy(head)) break; |
1182 |
head->read_var2 = NULL; head->read_step = 7; |
1183 |
case 7: |
1184 |
if (ReadFilePatternPolicy(head)) break; |
1185 |
head->read_var2 = NULL; head->read_step = 8; |
1186 |
case 8: |
1187 |
if (ReadNoRewritePolicy(head)) break; |
1188 |
head->read_var2 = NULL; head->read_step = 9; |
1189 |
case 9: |
1190 |
if (ReadPathGroupPolicy(head)) break; |
1191 |
head->read_var1 = head->read_var2 = NULL; head->read_step = 10; |
1192 |
case 10: |
1193 |
if (ReadAddressGroupPolicy(head)) break; |
1194 |
head->read_eof = 1; |
1195 |
break; |
1196 |
default: |
1197 |
return -EINVAL; |
1198 |
} |
1199 |
} |
1200 |
return 0; |
1201 |
} |
1202 |
|
1203 |
#endif |
1204 |
|
1205 |
/************************* SYSTEM POLICY HANDLER *************************/ |
1206 |
|
1207 |
#ifdef CONFIG_SAKURA |
1208 |
|
1209 |
static int AddSystemPolicy(struct io_buffer *head) |
1210 |
{ |
1211 |
char *data = head->write_buf; |
1212 |
bool is_delete = 0; |
1213 |
if (!isRoot(head)) return -EPERM; |
1214 |
UpdateCounter(CCS_UPDATES_COUNTER_SYSTEM_POLICY); |
1215 |
if (strncmp(data, KEYWORD_DELETE, KEYWORD_DELETE_LEN) == 0) { |
1216 |
data += KEYWORD_DELETE_LEN; |
1217 |
is_delete = 1; |
1218 |
} |
1219 |
if (strncmp(data, KEYWORD_ALLOW_MOUNT, KEYWORD_ALLOW_MOUNT_LEN) == 0) |
1220 |
return AddMountPolicy(data + KEYWORD_ALLOW_MOUNT_LEN, is_delete); |
1221 |
if (strncmp(data, KEYWORD_DENY_UNMOUNT, KEYWORD_DENY_UNMOUNT_LEN) == 0) |
1222 |
return AddNoUmountPolicy(data + KEYWORD_DENY_UNMOUNT_LEN, is_delete); |
1223 |
if (strncmp(data, KEYWORD_ALLOW_CHROOT, KEYWORD_ALLOW_CHROOT_LEN) == 0) |
1224 |
return AddChrootPolicy(data + KEYWORD_ALLOW_CHROOT_LEN, is_delete); |
1225 |
if (strncmp(data, KEYWORD_ALLOW_PIVOT_ROOT, KEYWORD_ALLOW_PIVOT_ROOT_LEN) == 0) |
1226 |
return AddPivotRootPolicy(data + KEYWORD_ALLOW_PIVOT_ROOT_LEN, is_delete); |
1227 |
if (strncmp(data, KEYWORD_DENY_AUTOBIND, KEYWORD_DENY_AUTOBIND_LEN) == 0) |
1228 |
return AddReservedPortPolicy(data + KEYWORD_DENY_AUTOBIND_LEN, is_delete); |
1229 |
return -EINVAL; |
1230 |
} |
1231 |
|
1232 |
static int ReadSystemPolicy(struct io_buffer *head) |
1233 |
{ |
1234 |
if (!head->read_eof) { |
1235 |
switch (head->read_step) { |
1236 |
case 0: |
1237 |
if (!isRoot(head)) return -EPERM; |
1238 |
head->read_var2 = NULL; head->read_step = 1; |
1239 |
case 1: |
1240 |
if (ReadMountPolicy(head)) break; |
1241 |
head->read_var2 = NULL; head->read_step = 2; |
1242 |
case 2: |
1243 |
if (ReadNoUmountPolicy(head)) break; |
1244 |
head->read_var2 = NULL; head->read_step = 3; |
1245 |
case 3: |
1246 |
if (ReadChrootPolicy(head)) break; |
1247 |
head->read_var2 = NULL; head->read_step = 4; |
1248 |
case 4: |
1249 |
if (ReadPivotRootPolicy(head)) break; |
1250 |
head->read_var2 = NULL; head->read_step = 5; |
1251 |
case 5: |
1252 |
if (ReadReservedPortPolicy(head)) break; |
1253 |
head->read_eof = 1; |
1254 |
break; |
1255 |
default: |
1256 |
return -EINVAL; |
1257 |
} |
1258 |
} |
1259 |
return 0; |
1260 |
} |
1261 |
|
1262 |
#endif |
1263 |
|
1264 |
/************************* POLICY LOADER *************************/ |
1265 |
|
1266 |
static int profile_loaded = 0; |
1267 |
|
1268 |
static const char *ccs_loader = NULL; |
1269 |
|
1270 |
static int __init CCS_loader_Setup(char *str) |
1271 |
{ |
1272 |
ccs_loader = str; |
1273 |
return 0; |
1274 |
} |
1275 |
|
1276 |
__setup("CCS_loader=", CCS_loader_Setup); |
1277 |
|
1278 |
void CCS_LoadPolicy(const char *filename) |
1279 |
{ |
1280 |
if (sbin_init_started) return; |
1281 |
/* |
1282 |
* Check filename is /sbin/init or /sbin/ccs-start . |
1283 |
* /sbin/ccs-start is a dummy filename in case where /sbin/init can't be passed. |
1284 |
* You can create /sbin/ccs-start by "ln -s /bin/true /sbin/ccs-start", for |
1285 |
* only the pathname is needed to activate Mandatory Access Control. |
1286 |
*/ |
1287 |
if (strcmp(filename, "/sbin/init") != 0 && strcmp(filename, "/sbin/ccs-start") != 0) return; |
1288 |
/* |
1289 |
* Don't activate MAC if the path given by 'CCS_loader=' option doesn't exist. |
1290 |
* If initrd.img includes /sbin/init but real-root-dev has not mounted on / yet, |
1291 |
* activating MAC will block the system since policies are not loaded yet. |
1292 |
* So let do_execve() call this function everytime. |
1293 |
*/ |
1294 |
{ |
1295 |
struct nameidata nd; |
1296 |
if (!ccs_loader) ccs_loader = "/sbin/ccs-init"; |
1297 |
if (path_lookup(ccs_loader, lookup_flags, &nd)) { |
1298 |
printk("Not activating Mandatory Access Control now since %s doesn't exist.\n", ccs_loader); |
1299 |
return; |
1300 |
} |
1301 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25) |
1302 |
path_put(&nd.path); |
1303 |
#else |
1304 |
path_release(&nd); |
1305 |
#endif |
1306 |
} |
1307 |
if (!profile_loaded) { |
1308 |
char *argv[2], *envp[3]; |
1309 |
printk("Calling %s to load policy. Please wait.\n", ccs_loader); |
1310 |
argv[0] = (char *) ccs_loader; |
1311 |
argv[1] = NULL; |
1312 |
envp[0] = "HOME=/"; |
1313 |
envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; |
1314 |
envp[2] = NULL; |
1315 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) |
1316 |
call_usermodehelper(argv[0], argv, envp, 1); |
1317 |
#else |
1318 |
call_usermodehelper(argv[0], argv, envp); |
1319 |
#endif |
1320 |
while (!profile_loaded) { |
1321 |
set_current_state(TASK_INTERRUPTIBLE); |
1322 |
schedule_timeout(HZ / 10); |
1323 |
} |
1324 |
} |
1325 |
#ifdef CONFIG_SAKURA |
1326 |
printk("SAKURA: 1.6.0-pre 2008/02/16\n"); |
1327 |
#endif |
1328 |
#ifdef CONFIG_TOMOYO |
1329 |
printk("TOMOYO: 1.6.0-pre 2008/02/18\n"); |
1330 |
#endif |
1331 |
printk("Mandatory Access Control activated.\n"); |
1332 |
sbin_init_started = 1; |
1333 |
ccs_log_level = KERN_WARNING; |
1334 |
{ /* Check all profiles currently assigned to domains are defined. */ |
1335 |
struct domain_info *domain; |
1336 |
list1_for_each_entry(domain, &domain_list, list) { |
1337 |
const u8 profile = domain->profile; |
1338 |
if (!profile_ptr[profile]) panic("Profile %u (used by '%s') not defined.\n", profile, domain->domainname->name); |
1339 |
} |
1340 |
} |
1341 |
} |
1342 |
|
1343 |
|
1344 |
/************************* MAC Decision Delayer *************************/ |
1345 |
|
1346 |
static DECLARE_WAIT_QUEUE_HEAD(query_wait); |
1347 |
|
1348 |
static spinlock_t query_lock = SPIN_LOCK_UNLOCKED; |
1349 |
|
1350 |
struct query_entry { |
1351 |
struct list_head list; |
1352 |
char *query; |
1353 |
int query_len; |
1354 |
unsigned int serial; |
1355 |
int timer; |
1356 |
int answer; |
1357 |
}; |
1358 |
|
1359 |
static LIST_HEAD(query_list); |
1360 |
static atomic_t queryd_watcher = ATOMIC_INIT(0); |
1361 |
|
1362 |
int CheckSupervisor(const char *fmt, ...) |
1363 |
{ |
1364 |
va_list args; |
1365 |
int error = -EPERM; |
1366 |
int pos, len; |
1367 |
static unsigned int serial = 0; |
1368 |
struct query_entry *query_entry; |
1369 |
if (!CheckCCSFlags(CCS_ALLOW_ENFORCE_GRACE) || !atomic_read(&queryd_watcher)) { |
1370 |
#ifdef ALT_EXEC |
1371 |
if ((current->tomoyo_flags & CCS_DONT_SLEEP_ON_ENFORCE_ERROR) == 0) { |
1372 |
int i; |
1373 |
for (i = 0; i < CheckCCSFlags(CCS_SLEEP_PERIOD); i++) { |
1374 |
set_current_state(TASK_INTERRUPTIBLE); |
1375 |
schedule_timeout(HZ / 10); |
1376 |
} |
1377 |
} |
1378 |
#endif |
1379 |
return -EPERM; |
1380 |
} |
1381 |
va_start(args, fmt); |
1382 |
len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32; |
1383 |
va_end(args); |
1384 |
if ((query_entry = ccs_alloc(sizeof(*query_entry))) == NULL || |
1385 |
(query_entry->query = ccs_alloc(len)) == NULL) goto out; |
1386 |
INIT_LIST_HEAD(&query_entry->list); |
1387 |
/***** CRITICAL SECTION START *****/ |
1388 |
spin_lock(&query_lock); |
1389 |
query_entry->serial = serial++; |
1390 |
spin_unlock(&query_lock); |
1391 |
/***** CRITICAL SECTION END *****/ |
1392 |
pos = snprintf(query_entry->query, len - 1, "Q%u\n", query_entry->serial); |
1393 |
va_start(args, fmt); |
1394 |
vsnprintf(query_entry->query + pos, len - 1 - pos, fmt, args); |
1395 |
query_entry->query_len = strlen(query_entry->query) + 1; |
1396 |
va_end(args); |
1397 |
/***** CRITICAL SECTION START *****/ |
1398 |
spin_lock(&query_lock); |
1399 |
list_add_tail(&query_entry->list, &query_list); |
1400 |
spin_unlock(&query_lock); |
1401 |
/***** CRITICAL SECTION END *****/ |
1402 |
UpdateCounter(CCS_UPDATES_COUNTER_QUERY); |
1403 |
/* Give 10 seconds for supervisor's opinion. */ |
1404 |
for (query_entry->timer = 0; atomic_read(&queryd_watcher) && CheckCCSFlags(CCS_ALLOW_ENFORCE_GRACE) && query_entry->timer < 100; query_entry->timer++) { |
1405 |
wake_up(&query_wait); |
1406 |
set_current_state(TASK_INTERRUPTIBLE); |
1407 |
schedule_timeout(HZ / 10); |
1408 |
if (query_entry->answer) break; |
1409 |
} |
1410 |
UpdateCounter(CCS_UPDATES_COUNTER_QUERY); |
1411 |
/***** CRITICAL SECTION START *****/ |
1412 |
spin_lock(&query_lock); |
1413 |
list_del(&query_entry->list); |
1414 |
spin_unlock(&query_lock); |
1415 |
/***** CRITICAL SECTION END *****/ |
1416 |
switch (query_entry->answer) { |
1417 |
case 1: |
1418 |
/* Granted by administrator. */ |
1419 |
error = 0; |
1420 |
break; |
1421 |
case 0: |
1422 |
/* Timed out. */ |
1423 |
break; |
1424 |
default: |
1425 |
/* Rejected by administrator. */ |
1426 |
break; |
1427 |
} |
1428 |
out: ; |
1429 |
if (query_entry) ccs_free(query_entry->query); |
1430 |
ccs_free(query_entry); |
1431 |
return error; |
1432 |
} |
1433 |
|
1434 |
static int PollQuery(struct file *file, poll_table *wait) |
1435 |
{ |
1436 |
int found; |
1437 |
/***** CRITICAL SECTION START *****/ |
1438 |
spin_lock(&query_lock); |
1439 |
found = !list_empty(&query_list); |
1440 |
spin_unlock(&query_lock); |
1441 |
/***** CRITICAL SECTION END *****/ |
1442 |
if (found) return POLLIN | POLLRDNORM; |
1443 |
poll_wait(file, &query_wait, wait); |
1444 |
/***** CRITICAL SECTION START *****/ |
1445 |
spin_lock(&query_lock); |
1446 |
found = !list_empty(&query_list); |
1447 |
spin_unlock(&query_lock); |
1448 |
/***** CRITICAL SECTION END *****/ |
1449 |
if (found) return POLLIN | POLLRDNORM; |
1450 |
return 0; |
1451 |
} |
1452 |
|
1453 |
static int ReadQuery(struct io_buffer *head) |
1454 |
{ |
1455 |
struct list_head *tmp; |
1456 |
int pos = 0, len = 0; |
1457 |
char *buf; |
1458 |
if (head->read_avail) return 0; |
1459 |
if (head->read_buf) { |
1460 |
ccs_free(head->read_buf); head->read_buf = NULL; |
1461 |
head->readbuf_size = 0; |
1462 |
} |
1463 |
/***** CRITICAL SECTION START *****/ |
1464 |
spin_lock(&query_lock); |
1465 |
list_for_each(tmp, &query_list) { |
1466 |
struct query_entry *ptr = list_entry(tmp, struct query_entry, list); |
1467 |
if (pos++ == head->read_step) { |
1468 |
len = ptr->query_len; |
1469 |
break; |
1470 |
} |
1471 |
} |
1472 |
spin_unlock(&query_lock); |
1473 |
/***** CRITICAL SECTION END *****/ |
1474 |
if (!len) { |
1475 |
head->read_step = 0; |
1476 |
return 0; |
1477 |
} |
1478 |
if ((buf = ccs_alloc(len)) != NULL) { |
1479 |
pos = 0; |
1480 |
/***** CRITICAL SECTION START *****/ |
1481 |
spin_lock(&query_lock); |
1482 |
list_for_each(tmp, &query_list) { |
1483 |
struct query_entry *ptr = list_entry(tmp, struct query_entry, list); |
1484 |
if (pos++ == head->read_step) { |
1485 |
/* Some query can be skiipped since query_list can change, but I don't care. */ |
1486 |
if (len == ptr->query_len) memmove(buf, ptr->query, len); |
1487 |
break; |
1488 |
} |
1489 |
} |
1490 |
spin_unlock(&query_lock); |
1491 |
/***** CRITICAL SECTION END *****/ |
1492 |
if (buf[0]) { |
1493 |
head->readbuf_size = head->read_avail = len; |
1494 |
head->read_buf = buf; |
1495 |
head->read_step++; |
1496 |
} else { |
1497 |
ccs_free(buf); |
1498 |
} |
1499 |
} |
1500 |
return 0; |
1501 |
} |
1502 |
|
1503 |
static int WriteAnswer(struct io_buffer *head) |
1504 |
{ |
1505 |
char *data = head->write_buf; |
1506 |
struct list_head *tmp; |
1507 |
unsigned int serial, answer; |
1508 |
/***** CRITICAL SECTION START *****/ |
1509 |
spin_lock(&query_lock); |
1510 |
list_for_each(tmp, &query_list) { |
1511 |
struct query_entry *ptr = list_entry(tmp, struct query_entry, list); |
1512 |
ptr->timer = 0; |
1513 |
} |
1514 |
spin_unlock(&query_lock); |
1515 |
/***** CRITICAL SECTION END *****/ |
1516 |
if (sscanf(data, "A%u=%u", &serial, &answer) != 2) return -EINVAL; |
1517 |
/***** CRITICAL SECTION START *****/ |
1518 |
spin_lock(&query_lock); |
1519 |
list_for_each(tmp, &query_list) { |
1520 |
struct query_entry *ptr = list_entry(tmp, struct query_entry, list); |
1521 |
if (ptr->serial != serial) continue; |
1522 |
if (!ptr->answer) ptr->answer = answer; |
1523 |
break; |
1524 |
} |
1525 |
spin_unlock(&query_lock); |
1526 |
/***** CRITICAL SECTION END *****/ |
1527 |
return 0; |
1528 |
} |
1529 |
|
1530 |
/************************* /proc INTERFACE HANDLER *************************/ |
1531 |
|
1532 |
/* Policy updates counter. */ |
1533 |
static unsigned int updates_counter[MAX_CCS_UPDATES_COUNTER]; |
1534 |
static spinlock_t updates_counter_lock = SPIN_LOCK_UNLOCKED; |
1535 |
|
1536 |
void UpdateCounter(const unsigned char index) |
1537 |
{ |
1538 |
/***** CRITICAL SECTION START *****/ |
1539 |
spin_lock(&updates_counter_lock); |
1540 |
if (index < MAX_CCS_UPDATES_COUNTER) updates_counter[index]++; |
1541 |
spin_unlock(&updates_counter_lock); |
1542 |
/***** CRITICAL SECTION END *****/ |
1543 |
} |
1544 |
|
1545 |
static int ReadUpdatesCounter(struct io_buffer *head) |
1546 |
{ |
1547 |
if (!head->read_eof) { |
1548 |
unsigned int counter[MAX_CCS_UPDATES_COUNTER]; |
1549 |
/***** CRITICAL SECTION START *****/ |
1550 |
spin_lock(&updates_counter_lock); |
1551 |
memmove(counter, updates_counter, sizeof(updates_counter)); |
1552 |
memset(updates_counter, 0, sizeof(updates_counter)); |
1553 |
spin_unlock(&updates_counter_lock); |
1554 |
/***** CRITICAL SECTION END *****/ |
1555 |
io_printf(head, |
1556 |
"/proc/ccs/system_policy: %10u\n" |
1557 |
"/proc/ccs/domain_policy: %10u\n" |
1558 |
"/proc/ccs/exception_policy: %10u\n" |
1559 |
"/proc/ccs/profile: %10u\n" |
1560 |
"/proc/ccs/query: %10u\n" |
1561 |
"/proc/ccs/manager: %10u\n" |
1562 |
"/proc/ccs/grant_log: %10u\n" |
1563 |
"/proc/ccs/reject_log: %10u\n", |
1564 |
counter[CCS_UPDATES_COUNTER_SYSTEM_POLICY], |
1565 |
counter[CCS_UPDATES_COUNTER_DOMAIN_POLICY], |
1566 |
counter[CCS_UPDATES_COUNTER_EXCEPTION_POLICY], |
1567 |
counter[CCS_UPDATES_COUNTER_PROFILE], |
1568 |
counter[CCS_UPDATES_COUNTER_QUERY], |
1569 |
counter[CCS_UPDATES_COUNTER_MANAGER], |
1570 |
counter[CCS_UPDATES_COUNTER_GRANT_LOG], |
1571 |
counter[CCS_UPDATES_COUNTER_REJECT_LOG]); |
1572 |
head->read_eof = 1; |
1573 |
} |
1574 |
return 0; |
1575 |
} |
1576 |
|
1577 |
static int ReadVersion(struct io_buffer *head) |
1578 |
{ |
1579 |
if (!head->read_eof) { |
1580 |
if (io_printf(head, "1.6.0-pre") == 0) head->read_eof = 1; |
1581 |
} |
1582 |
return 0; |
1583 |
} |
1584 |
|
1585 |
static int ReadMemoryCounter(struct io_buffer *head) |
1586 |
{ |
1587 |
if (!head->read_eof) { |
1588 |
const int shared = GetMemoryUsedForSaveName(), private = GetMemoryUsedForElements(), dynamic = GetMemoryUsedForDynamic(); |
1589 |
if (io_printf(head, "Shared: %10u\nPrivate: %10u\nDynamic: %10u\nTotal: %10u\n", shared, private, dynamic, shared + private + dynamic) == 0) head->read_eof = 1; |
1590 |
} |
1591 |
return 0; |
1592 |
} |
1593 |
|
1594 |
static int ReadSelfDomain(struct io_buffer *head) |
1595 |
{ |
1596 |
if (!head->read_eof) { |
1597 |
io_printf(head, "%s", current->domain_info->domainname->name); |
1598 |
head->read_eof = 1; |
1599 |
} |
1600 |
return 0; |
1601 |
} |
1602 |
|
1603 |
int CCS_OpenControl(const u8 type, struct file *file) |
1604 |
{ |
1605 |
struct io_buffer *head = ccs_alloc(sizeof(*head)); |
1606 |
if (!head) return -ENOMEM; |
1607 |
mutex_init(&head->read_sem); |
1608 |
mutex_init(&head->write_sem); |
1609 |
switch (type) { |
1610 |
#ifdef CONFIG_SAKURA |
1611 |
case CCS_SYSTEMPOLICY: |
1612 |
head->write = AddSystemPolicy; |
1613 |
head->read = ReadSystemPolicy; |
1614 |
break; |
1615 |
#endif |
1616 |
#ifdef CONFIG_TOMOYO |
1617 |
case CCS_DOMAINPOLICY: |
1618 |
head->write = AddDomainPolicy; |
1619 |
head->read = ReadDomainPolicy; |
1620 |
break; |
1621 |
case CCS_EXCEPTIONPOLICY: |
1622 |
head->write = AddExceptionPolicy; |
1623 |
head->read = ReadExceptionPolicy; |
1624 |
break; |
1625 |
case CCS_GRANTLOG: |
1626 |
head->poll = PollGrantLog; |
1627 |
head->read = ReadGrantLog; |
1628 |
break; |
1629 |
case CCS_REJECTLOG: |
1630 |
head->poll = PollRejectLog; |
1631 |
head->read = ReadRejectLog; |
1632 |
break; |
1633 |
#endif |
1634 |
case CCS_SELFDOMAIN: |
1635 |
head->read = ReadSelfDomain; |
1636 |
break; |
1637 |
case CCS_DOMAIN_STATUS: |
1638 |
head->write = UpdateDomainProfile; |
1639 |
head->read = ReadDomainProfile; |
1640 |
break; |
1641 |
case CCS_PROCESS_STATUS: |
1642 |
head->write = WritePID; |
1643 |
head->read = ReadPID; |
1644 |
break; |
1645 |
case CCS_VERSION: |
1646 |
head->read = ReadVersion; |
1647 |
head->readbuf_size = 128; |
1648 |
break; |
1649 |
case CCS_MEMINFO: |
1650 |
head->read = ReadMemoryCounter; |
1651 |
head->readbuf_size = 128; |
1652 |
break; |
1653 |
case CCS_PROFILE: |
1654 |
head->write = SetProfile; |
1655 |
head->read = ReadProfile; |
1656 |
break; |
1657 |
case CCS_QUERY: |
1658 |
head->poll = PollQuery; |
1659 |
head->write = WriteAnswer; |
1660 |
head->read = ReadQuery; |
1661 |
break; |
1662 |
case CCS_MANAGER: |
1663 |
head->write = AddManagerPolicy; |
1664 |
head->read = ReadManagerPolicy; |
1665 |
break; |
1666 |
case CCS_UPDATESCOUNTER: |
1667 |
head->read = ReadUpdatesCounter; |
1668 |
break; |
1669 |
} |
1670 |
if (type != CCS_GRANTLOG && type != CCS_REJECTLOG && type != CCS_QUERY) { |
1671 |
if (!head->readbuf_size) head->readbuf_size = PAGE_SIZE * 2; |
1672 |
if ((head->read_buf = ccs_alloc(head->readbuf_size)) == NULL) { |
1673 |
ccs_free(head); |
1674 |
return -ENOMEM; |
1675 |
} |
1676 |
} |
1677 |
if (head->write) { |
1678 |
head->writebuf_size = PAGE_SIZE * 2; |
1679 |
if ((head->write_buf = ccs_alloc(head->writebuf_size)) == NULL) { |
1680 |
ccs_free(head->read_buf); |
1681 |
ccs_free(head); |
1682 |
return -ENOMEM; |
1683 |
} |
1684 |
} |
1685 |
{ /* Set owner of this entry. */ |
1686 |
struct inode *inode = file->f_dentry->d_inode; |
1687 |
head->uid = inode ? inode->i_uid : 0; |
1688 |
head->gid = inode ? inode->i_gid : 0; |
1689 |
} |
1690 |
file->private_data = head; |
1691 |
if (type == CCS_SELFDOMAIN) CCS_ReadControl(file, NULL, 0); |
1692 |
else if (head->write == WriteAnswer) atomic_inc(&queryd_watcher); |
1693 |
return 0; |
1694 |
} |
1695 |
|
1696 |
static int CopyToUser(struct io_buffer *head, char __user * buffer, int buffer_len) |
1697 |
{ |
1698 |
int len = head->read_avail; |
1699 |
char *cp = head->read_buf; |
1700 |
if (len > buffer_len) len = buffer_len; |
1701 |
if (len) { |
1702 |
if (copy_to_user(buffer, cp, len)) return -EFAULT; |
1703 |
head->read_avail -= len; |
1704 |
memmove(cp, cp + len, head->read_avail); |
1705 |
} |
1706 |
return len; |
1707 |
} |
1708 |
|
1709 |
int CCS_PollControl(struct file *file, poll_table *wait) |
1710 |
{ |
1711 |
struct io_buffer *head = file->private_data; |
1712 |
if (!head->poll) return -ENOSYS; |
1713 |
return head->poll(file, wait); |
1714 |
} |
1715 |
|
1716 |
int CCS_ReadControl(struct file *file, char __user *buffer, const int buffer_len) |
1717 |
{ |
1718 |
int len = 0; |
1719 |
struct io_buffer *head = file->private_data; |
1720 |
if (!head->read) return -ENOSYS; |
1721 |
if (!access_ok(VERIFY_WRITE, buffer, buffer_len)) return -EFAULT; |
1722 |
if (mutex_lock_interruptible(&head->read_sem)) return -EINTR; |
1723 |
len = head->read(head); |
1724 |
if (len >= 0) len = CopyToUser(head, buffer, buffer_len); |
1725 |
mutex_unlock(&head->read_sem); |
1726 |
return len; |
1727 |
} |
1728 |
|
1729 |
int CCS_WriteControl(struct file *file, const char __user *buffer, const int buffer_len) |
1730 |
{ |
1731 |
struct io_buffer *head = file->private_data; |
1732 |
int error = buffer_len; |
1733 |
int avail_len = buffer_len; |
1734 |
char *cp0 = head->write_buf; |
1735 |
if (!head->write) return -ENOSYS; |
1736 |
if (!access_ok(VERIFY_READ, buffer, buffer_len)) return -EFAULT; |
1737 |
if (!isRoot(head)) return -EPERM; |
1738 |
if (head->write != WritePID && !IsPolicyManager()) { |
1739 |
return -EPERM; /* Forbid updating policies for non manager programs. */ |
1740 |
} |
1741 |
if (mutex_lock_interruptible(&head->write_sem)) return -EINTR; |
1742 |
while (avail_len > 0) { |
1743 |
char c; |
1744 |
if (head->write_avail >= head->writebuf_size - 1) { |
1745 |
error = -ENOMEM; |
1746 |
break; |
1747 |
} else if (get_user(c, buffer)) { |
1748 |
error = -EFAULT; |
1749 |
break; |
1750 |
} |
1751 |
buffer++; avail_len--; |
1752 |
cp0[head->write_avail++] = c; |
1753 |
if (c != '\n') continue; |
1754 |
cp0[head->write_avail - 1] = '\0'; |
1755 |
head->write_avail = 0; |
1756 |
NormalizeLine(cp0); |
1757 |
head->write(head); |
1758 |
} |
1759 |
mutex_unlock(&head->write_sem); |
1760 |
return error; |
1761 |
} |
1762 |
|
1763 |
|
1764 |
int CCS_CloseControl(struct file *file) |
1765 |
{ |
1766 |
struct io_buffer *head = file->private_data; |
1767 |
if (head->write == WriteAnswer) atomic_dec(&queryd_watcher); |
1768 |
else if (head->read == ReadMemoryCounter) profile_loaded = 1; |
1769 |
ccs_free(head->read_buf); head->read_buf = NULL; |
1770 |
ccs_free(head->write_buf); head->write_buf = NULL; |
1771 |
ccs_free(head); head = NULL; |
1772 |
file->private_data = NULL; |
1773 |
return 0; |
1774 |
} |
1775 |
|
1776 |
void *alloc_acl_element(const u8 acl_type, const struct condition_list *condition) |
1777 |
{ |
1778 |
int len; |
1779 |
struct acl_info *ptr; |
1780 |
switch (acl_type) { |
1781 |
case TYPE_SINGLE_PATH_ACL: |
1782 |
len = sizeof(struct single_path_acl_record); |
1783 |
break; |
1784 |
case TYPE_DOUBLE_PATH_ACL: |
1785 |
len = sizeof(struct double_path_acl_record); |
1786 |
break; |
1787 |
case TYPE_ARGV0_ACL: |
1788 |
len = sizeof(struct argv0_acl_record); |
1789 |
break; |
1790 |
case TYPE_ENV_ACL: |
1791 |
len = sizeof(struct env_acl_record); |
1792 |
break; |
1793 |
case TYPE_CAPABILITY_ACL: |
1794 |
len = sizeof(struct capability_acl_record); |
1795 |
break; |
1796 |
case TYPE_IP_NETWORK_ACL: |
1797 |
len = sizeof(struct ip_network_acl_record); |
1798 |
break; |
1799 |
case TYPE_SIGNAL_ACL: |
1800 |
len = sizeof(struct signal_acl_record); |
1801 |
break; |
1802 |
default: |
1803 |
return NULL; |
1804 |
} |
1805 |
if (!condition) len -= sizeof(ptr->cond); |
1806 |
ptr = alloc_element(len); |
1807 |
if (!ptr) return NULL; |
1808 |
if (condition) { |
1809 |
ptr->cond = condition; |
1810 |
ptr->type = acl_type | ACL_WITH_CONDITION; |
1811 |
return ptr; |
1812 |
} |
1813 |
ptr = (void *) (((u8 *) ptr) - sizeof(ptr->cond)); |
1814 |
ptr->type = acl_type; |
1815 |
return ptr; |
1816 |
} |
1817 |
|
1818 |
const struct condition_list *GetConditionPart(const struct acl_info *acl) |
1819 |
{ |
1820 |
return (acl->type & ACL_WITH_CONDITION) ? acl->cond : NULL; |
1821 |
} |