1 |
/* |
/* |
2 |
* security/ccsecurity/domain.c |
* security/ccsecurity/domain.c |
3 |
* |
* |
4 |
* Copyright (C) 2005-2009 NTT DATA CORPORATION |
* Copyright (C) 2005-2010 NTT DATA CORPORATION |
5 |
* |
* |
6 |
* Version: 1.7.0-pre 2009/08/24 |
* Version: 1.7.2+ 2010/05/05 |
7 |
* |
* |
8 |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
9 |
* See README.ccs for ChangeLog. |
* See README.ccs for ChangeLog. |
22 |
#endif |
#endif |
23 |
#include "internal.h" |
#include "internal.h" |
24 |
|
|
|
/* For compatibility with older kernels. */ |
|
|
#ifndef for_each_process |
|
|
#define for_each_process for_each_task |
|
|
#endif |
|
|
|
|
25 |
/* Variables definitions.*/ |
/* Variables definitions.*/ |
26 |
|
|
27 |
/* The initial domain. */ |
/* The initial domain. */ |
34 |
* ccs_audit_execute_handler_log - Audit execute_handler log. |
* ccs_audit_execute_handler_log - Audit execute_handler log. |
35 |
* |
* |
36 |
* @ee: Pointer to "struct ccs_execve_entry". |
* @ee: Pointer to "struct ccs_execve_entry". |
|
* @is_default: True if it is "execute_handler" log. |
|
37 |
* |
* |
38 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
39 |
*/ |
*/ |
40 |
static int ccs_audit_execute_handler_log(struct ccs_execve_entry *ee, |
static int ccs_audit_execute_handler_log(struct ccs_execve_entry *ee) |
|
const bool is_default) |
|
41 |
{ |
{ |
42 |
struct ccs_request_info *r = &ee->r; |
struct ccs_request_info *r = &ee->r; |
43 |
const char *handler = ee->handler->name; |
const char *handler = ee->handler->name; |
44 |
|
r->type = CCS_MAC_FILE_EXECUTE; |
45 |
r->mode = ccs_get_mode(r->profile, CCS_MAC_FILE_EXECUTE); |
r->mode = ccs_get_mode(r->profile, CCS_MAC_FILE_EXECUTE); |
46 |
return ccs_write_audit_log(true, r, "%s %s\n", |
return ccs_write_audit_log(true, r, "%s" CCS_KEYWORD_EXECUTE_HANDLER |
47 |
is_default ? CCS_KEYWORD_EXECUTE_HANDLER : |
" %s\n", ee->handler_type == |
48 |
CCS_KEYWORD_DENIED_EXECUTE_HANDLER, handler); |
CCS_TYPE_DENIED_EXECUTE_HANDLER ? |
49 |
|
"denied" : "", handler); |
50 |
} |
} |
51 |
|
|
52 |
/** |
/** |
53 |
* ccs_audit_domain_creation_log - Audit domain creation log. |
* ccs_audit_domain_creation_log - Audit domain creation log. |
54 |
* |
* |
|
* @domain: Pointer to "struct ccs_domain_info". |
|
|
* |
|
55 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
56 |
*/ |
*/ |
57 |
static int ccs_audit_domain_creation_log(struct ccs_domain_info *domain) |
static int ccs_audit_domain_creation_log(void) |
58 |
{ |
{ |
|
int error; |
|
59 |
struct ccs_request_info r; |
struct ccs_request_info r; |
60 |
ccs_init_request_info(&r, domain, CCS_MAC_FILE_EXECUTE); |
ccs_init_request_info(&r, CCS_MAC_FILE_EXECUTE); |
61 |
error = ccs_write_audit_log(false, &r, "use_profile %u\n", r.profile); |
return ccs_write_audit_log(false, &r, "use_profile %u\n", r.profile); |
|
return error; |
|
62 |
} |
} |
63 |
|
|
64 |
/* The list for "struct ccs_domain_initializer_entry". */ |
/* The list for "struct ccs_domain_initializer_entry". */ |
79 |
const bool is_not, |
const bool is_not, |
80 |
const bool is_delete) |
const bool is_delete) |
81 |
{ |
{ |
|
struct ccs_domain_initializer_entry *entry = NULL; |
|
82 |
struct ccs_domain_initializer_entry *ptr; |
struct ccs_domain_initializer_entry *ptr; |
83 |
struct ccs_domain_initializer_entry e = { .is_not = is_not }; |
struct ccs_domain_initializer_entry e = { .is_not = is_not }; |
84 |
int error = is_delete ? -ENOENT : -ENOMEM; |
int error = is_delete ? -ENOENT : -ENOMEM; |
97 |
e.program = ccs_get_name(program); |
e.program = ccs_get_name(program); |
98 |
if (!e.program) |
if (!e.program) |
99 |
goto out; |
goto out; |
100 |
if (!is_delete) |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
101 |
entry = kmalloc(sizeof(e), GFP_KERNEL); |
goto out; |
|
mutex_lock(&ccs_policy_lock); |
|
102 |
list_for_each_entry_rcu(ptr, &ccs_domain_initializer_list, list) { |
list_for_each_entry_rcu(ptr, &ccs_domain_initializer_list, list) { |
103 |
if (ccs_memcmp(ptr, &e, offsetof(typeof(e), is_not), |
if (!ccs_is_same_domain_initializer_entry(ptr, &e)) |
|
sizeof(e))) |
|
104 |
continue; |
continue; |
105 |
ptr->is_deleted = is_delete; |
ptr->is_deleted = is_delete; |
106 |
error = 0; |
error = 0; |
107 |
break; |
break; |
108 |
} |
} |
109 |
if (!is_delete && error && ccs_commit_ok(entry, &e, sizeof(e))) { |
if (!is_delete && error) { |
110 |
list_add_tail_rcu(&entry->list, &ccs_domain_initializer_list); |
struct ccs_domain_initializer_entry *entry = |
111 |
entry = NULL; |
ccs_commit_ok(&e, sizeof(e)); |
112 |
error = 0; |
if (entry) { |
113 |
|
list_add_tail_rcu(&entry->list, |
114 |
|
&ccs_domain_initializer_list); |
115 |
|
error = 0; |
116 |
|
} |
117 |
} |
} |
118 |
mutex_unlock(&ccs_policy_lock); |
mutex_unlock(&ccs_policy_lock); |
119 |
out: |
out: |
120 |
ccs_put_name(e.domainname); |
ccs_put_name(e.domainname); |
121 |
ccs_put_name(e.program); |
ccs_put_name(e.program); |
|
kfree(entry); |
|
122 |
return error; |
return error; |
123 |
} |
} |
124 |
|
|
240 |
const bool is_not, |
const bool is_not, |
241 |
const bool is_delete) |
const bool is_delete) |
242 |
{ |
{ |
|
struct ccs_domain_keeper_entry *entry = NULL; |
|
243 |
struct ccs_domain_keeper_entry *ptr; |
struct ccs_domain_keeper_entry *ptr; |
244 |
struct ccs_domain_keeper_entry e = { .is_not = is_not }; |
struct ccs_domain_keeper_entry e = { .is_not = is_not }; |
245 |
int error = is_delete ? -ENOENT : -ENOMEM; |
int error = is_delete ? -ENOENT : -ENOMEM; |
258 |
e.domainname = ccs_get_name(domainname); |
e.domainname = ccs_get_name(domainname); |
259 |
if (!e.domainname) |
if (!e.domainname) |
260 |
goto out; |
goto out; |
261 |
if (!is_delete) |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
262 |
entry = kmalloc(sizeof(e), GFP_KERNEL); |
goto out; |
|
mutex_lock(&ccs_policy_lock); |
|
263 |
list_for_each_entry_rcu(ptr, &ccs_domain_keeper_list, list) { |
list_for_each_entry_rcu(ptr, &ccs_domain_keeper_list, list) { |
264 |
if (ccs_memcmp(ptr, &e, offsetof(typeof(e), is_not), |
if (!ccs_is_same_domain_keeper_entry(ptr, &e)) |
|
sizeof(e))) |
|
265 |
continue; |
continue; |
266 |
ptr->is_deleted = is_delete; |
ptr->is_deleted = is_delete; |
267 |
error = 0; |
error = 0; |
268 |
break; |
break; |
269 |
} |
} |
270 |
if (!is_delete && error && ccs_commit_ok(entry, &e, sizeof(e))) { |
if (!is_delete && error) { |
271 |
list_add_tail_rcu(&entry->list, &ccs_domain_keeper_list); |
struct ccs_domain_keeper_entry *entry = |
272 |
entry = NULL; |
ccs_commit_ok(&e, sizeof(e)); |
273 |
error = 0; |
if (entry) { |
274 |
|
list_add_tail_rcu(&entry->list, |
275 |
|
&ccs_domain_keeper_list); |
276 |
|
error = 0; |
277 |
|
} |
278 |
} |
} |
279 |
mutex_unlock(&ccs_policy_lock); |
mutex_unlock(&ccs_policy_lock); |
280 |
out: |
out: |
281 |
ccs_put_name(e.domainname); |
ccs_put_name(e.domainname); |
282 |
ccs_put_name(e.program); |
ccs_put_name(e.program); |
|
kfree(entry); |
|
283 |
return error; |
return error; |
284 |
} |
} |
285 |
|
|
394 |
const char *aggregated_name, |
const char *aggregated_name, |
395 |
const bool is_delete) |
const bool is_delete) |
396 |
{ |
{ |
|
struct ccs_aggregator_entry *entry = NULL; |
|
397 |
struct ccs_aggregator_entry *ptr; |
struct ccs_aggregator_entry *ptr; |
398 |
struct ccs_aggregator_entry e = { }; |
struct ccs_aggregator_entry e = { }; |
399 |
int error = is_delete ? -ENOENT : -ENOMEM; |
int error = is_delete ? -ENOENT : -ENOMEM; |
404 |
e.aggregated_name = ccs_get_name(aggregated_name); |
e.aggregated_name = ccs_get_name(aggregated_name); |
405 |
if (!e.original_name || !e.aggregated_name) |
if (!e.original_name || !e.aggregated_name) |
406 |
goto out; |
goto out; |
407 |
if (!is_delete) |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
408 |
entry = kmalloc(sizeof(e), GFP_KERNEL); |
goto out; |
|
mutex_lock(&ccs_policy_lock); |
|
409 |
list_for_each_entry_rcu(ptr, &ccs_aggregator_list, list) { |
list_for_each_entry_rcu(ptr, &ccs_aggregator_list, list) { |
410 |
if (ccs_memcmp(ptr, &e, offsetof(typeof(e), original_name), |
if (!ccs_is_same_aggregator_entry(ptr, &e)) |
|
sizeof(e))) |
|
411 |
continue; |
continue; |
412 |
ptr->is_deleted = is_delete; |
ptr->is_deleted = is_delete; |
413 |
error = 0; |
error = 0; |
414 |
break; |
break; |
415 |
} |
} |
416 |
if (!is_delete && error && ccs_commit_ok(entry, &e, sizeof(e))) { |
if (!is_delete && error) { |
417 |
list_add_tail_rcu(&entry->list, &ccs_aggregator_list); |
struct ccs_aggregator_entry *entry = |
418 |
entry = NULL; |
ccs_commit_ok(&e, sizeof(e)); |
419 |
error = 0; |
if (entry) { |
420 |
|
list_add_tail_rcu(&entry->list, &ccs_aggregator_list); |
421 |
|
error = 0; |
422 |
|
} |
423 |
} |
} |
424 |
mutex_unlock(&ccs_policy_lock); |
mutex_unlock(&ccs_policy_lock); |
425 |
out: |
out: |
426 |
ccs_put_name(e.original_name); |
ccs_put_name(e.original_name); |
427 |
ccs_put_name(e.aggregated_name); |
ccs_put_name(e.aggregated_name); |
|
kfree(entry); |
|
428 |
return error; |
return error; |
429 |
} |
} |
430 |
|
|
486 |
struct ccs_path_info name; |
struct ccs_path_info name; |
487 |
name.name = domainname; |
name.name = domainname; |
488 |
ccs_fill_path_info(&name); |
ccs_fill_path_info(&name); |
489 |
mutex_lock(&ccs_policy_lock); |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
490 |
|
return 0; |
491 |
/* Is there an active domain? */ |
/* Is there an active domain? */ |
492 |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
493 |
/* Never delete ccs_kernel_domain */ |
/* Never delete ccs_kernel_domain */ |
515 |
const u8 profile) |
const u8 profile) |
516 |
{ |
{ |
517 |
struct ccs_domain_info *entry; |
struct ccs_domain_info *entry; |
518 |
struct ccs_domain_info *domain; |
struct ccs_domain_info *domain = NULL; |
519 |
const struct ccs_path_info *saved_domainname; |
const struct ccs_path_info *saved_domainname; |
520 |
bool found = false; |
bool found = false; |
521 |
|
|
524 |
saved_domainname = ccs_get_name(domainname); |
saved_domainname = ccs_get_name(domainname); |
525 |
if (!saved_domainname) |
if (!saved_domainname) |
526 |
return NULL; |
return NULL; |
527 |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
entry = kzalloc(sizeof(*entry), CCS_GFP_FLAGS); |
528 |
mutex_lock(&ccs_policy_lock); |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
529 |
|
goto out; |
530 |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
531 |
if (domain->is_deleted || |
if (domain->is_deleted || |
532 |
ccs_pathcmp(saved_domainname, domain->domainname)) |
ccs_pathcmp(saved_domainname, domain->domainname)) |
545 |
found = true; |
found = true; |
546 |
} |
} |
547 |
mutex_unlock(&ccs_policy_lock); |
mutex_unlock(&ccs_policy_lock); |
548 |
|
out: |
549 |
ccs_put_name(saved_domainname); |
ccs_put_name(saved_domainname); |
550 |
kfree(entry); |
kfree(entry); |
551 |
return found ? domain : NULL; |
return found ? domain : NULL; |
565 |
struct ccs_request_info *r = &ee->r; |
struct ccs_request_info *r = &ee->r; |
566 |
const struct ccs_path_info *handler = ee->handler; |
const struct ccs_path_info *handler = ee->handler; |
567 |
struct ccs_domain_info *domain = NULL; |
struct ccs_domain_info *domain = NULL; |
568 |
const char *old_domain_name = r->domain->domainname->name; |
struct ccs_domain_info * const old_domain = ccs_current_domain(); |
569 |
|
const char *old_domain_name = old_domain->domainname->name; |
570 |
struct linux_binprm *bprm = ee->bprm; |
struct linux_binprm *bprm = ee->bprm; |
571 |
const u32 ccs_flags = current->ccs_flags; |
struct task_struct *task = current; |
572 |
|
const u32 ccs_flags = task->ccs_flags; |
573 |
struct ccs_path_info rn = { }; /* real name */ |
struct ccs_path_info rn = { }; /* real name */ |
574 |
struct ccs_path_info ln; /* last name */ |
struct ccs_path_info ln; /* last name */ |
575 |
int retval; |
int retval; |
576 |
bool need_kfree = false; |
bool need_kfree = false; |
577 |
|
bool domain_created = false; |
578 |
ln.name = ccs_last_word(old_domain_name); |
ln.name = ccs_last_word(old_domain_name); |
579 |
ccs_fill_path_info(&ln); |
ccs_fill_path_info(&ln); |
580 |
retry: |
retry: |
618 |
|
|
619 |
/* Check execute permission. */ |
/* Check execute permission. */ |
620 |
retval = ccs_exec_perm(r, &rn); |
retval = ccs_exec_perm(r, &rn); |
621 |
if (retval == 1) |
if (retval == CCS_RETRY_REQUEST) |
622 |
goto retry; |
goto retry; |
623 |
if (retval < 0) |
if (retval < 0) |
624 |
goto out; |
goto out; |
625 |
} |
} |
626 |
|
|
627 |
/* Calculate domain to transit to. */ |
/* Calculate domain to transit to. */ |
628 |
if (ccs_is_domain_initializer(r->domain->domainname, &rn, &ln)) { |
if (ccs_is_domain_initializer(old_domain->domainname, &rn, &ln)) { |
629 |
/* Transit to the child of ccs_kernel_domain domain. */ |
/* Transit to the child of ccs_kernel_domain domain. */ |
630 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, ROOT_NAME " " "%s", |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, ROOT_NAME " " "%s", |
631 |
rn.name); |
rn.name); |
632 |
} else if (r->domain == &ccs_kernel_domain && !ccs_policy_loaded) { |
} else if (old_domain == &ccs_kernel_domain && !ccs_policy_loaded) { |
633 |
/* |
/* |
634 |
* Needn't to transit from kernel domain before starting |
* Needn't to transit from kernel domain before starting |
635 |
* /sbin/init. But transit from kernel domain if executing |
* /sbin/init. But transit from kernel domain if executing |
636 |
* initializers because they might start before /sbin/init. |
* initializers because they might start before /sbin/init. |
637 |
*/ |
*/ |
638 |
domain = r->domain; |
domain = old_domain; |
639 |
} else if (ccs_is_domain_keeper(r->domain->domainname, &rn, &ln)) { |
} else if (ccs_is_domain_keeper(old_domain->domainname, &rn, &ln)) { |
640 |
/* Keep current domain. */ |
/* Keep current domain. */ |
641 |
domain = r->domain; |
domain = old_domain; |
642 |
} else { |
} else { |
643 |
/* Normal domain transition. */ |
/* Normal domain transition. */ |
644 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s %s", |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s %s", |
649 |
domain = ccs_find_domain(ee->tmp); |
domain = ccs_find_domain(ee->tmp); |
650 |
if (domain) |
if (domain) |
651 |
goto done; |
goto done; |
652 |
if (r->mode == CCS_MAC_MODE_ENFORCING) { |
if (r->mode == CCS_CONFIG_ENFORCING) { |
653 |
int error = ccs_supervisor(r, "# wants to create domain\n" |
int error = ccs_supervisor(r, "# wants to create domain\n" |
654 |
"%s\n", ee->tmp); |
"%s\n", ee->tmp); |
655 |
if (error == 1) |
if (error == CCS_RETRY_REQUEST) |
656 |
goto retry; |
goto retry; |
657 |
if (error < 0) |
if (error < 0) |
658 |
goto done; |
goto done; |
659 |
} |
} |
660 |
domain = ccs_find_or_assign_new_domain(ee->tmp, r->profile); |
domain = ccs_find_or_assign_new_domain(ee->tmp, r->profile); |
661 |
if (domain) |
if (domain) |
662 |
ccs_audit_domain_creation_log(r->domain); |
domain_created = true; |
663 |
done: |
done: |
664 |
if (!domain) { |
if (!domain) { |
665 |
printk(KERN_WARNING "ERROR: Domain '%s' not defined.\n", |
retval = (r->mode == CCS_CONFIG_ENFORCING) ? -EPERM : 0; |
666 |
ee->tmp); |
if (!old_domain->domain_transition_failed) { |
667 |
if (r->mode == CCS_MAC_MODE_ENFORCING) |
old_domain->domain_transition_failed = true; |
668 |
retval = -EPERM; |
ccs_write_audit_log(false, r, |
669 |
else { |
CCS_KEYWORD_TRANSITION_FAILED |
670 |
retval = 0; |
"\n"); |
671 |
r->domain->domain_transition_failed = true; |
printk(KERN_WARNING "ERROR: Domain '%s' not defined.\n", |
672 |
|
ee->tmp); |
673 |
} |
} |
674 |
} else { |
} else { |
675 |
retval = 0; |
retval = 0; |
676 |
} |
} |
677 |
out: |
if (!retval && handler) |
678 |
|
ccs_audit_execute_handler_log(ee); |
679 |
|
/* |
680 |
|
* Tell GC that I started execve(). |
681 |
|
* Also, tell open_exec() to check read permission. |
682 |
|
*/ |
683 |
|
task->ccs_flags |= CCS_TASK_IS_IN_EXECVE; |
684 |
|
/* |
685 |
|
* Make task->ccs_flags visible to GC before changing |
686 |
|
* task->ccs_domain_info . |
687 |
|
*/ |
688 |
|
smp_mb(); |
689 |
|
/* |
690 |
|
* Proceed to the next domain in order to allow reaching via PID. |
691 |
|
* It will be reverted if execve() failed. Reverting is not good. |
692 |
|
* But it is better than being unable to reach via PID in interactive |
693 |
|
* enforcing mode. |
694 |
|
*/ |
695 |
if (domain) |
if (domain) |
696 |
r->domain = domain; |
task->ccs_domain_info = domain; |
697 |
|
if (domain_created) |
698 |
|
ccs_audit_domain_creation_log(); |
699 |
|
out: |
700 |
if (need_kfree) |
if (need_kfree) |
701 |
kfree(rn.name); |
kfree(rn.name); |
702 |
return retval; |
return retval; |
713 |
{ |
{ |
714 |
struct ccs_request_info *r = &ee->r; |
struct ccs_request_info *r = &ee->r; |
715 |
struct linux_binprm *bprm = ee->bprm; |
struct linux_binprm *bprm = ee->bprm; |
716 |
char *arg_ptr = ee->tmp; |
/* env_page->data is allocated by ccs_dump_page(). */ |
717 |
|
struct ccs_page_dump env_page = { }; |
718 |
|
char *arg_ptr; /* Size is CCS_EXEC_TMPSIZE bytes */ |
719 |
int arg_len = 0; |
int arg_len = 0; |
720 |
unsigned long pos = bprm->p; |
unsigned long pos = bprm->p; |
721 |
int offset = pos % PAGE_SIZE; |
int offset = pos % PAGE_SIZE; |
723 |
int envp_count = bprm->envc; |
int envp_count = bprm->envc; |
724 |
/* printk(KERN_DEBUG "start %d %d\n", argv_count, envp_count); */ |
/* printk(KERN_DEBUG "start %d %d\n", argv_count, envp_count); */ |
725 |
int error = -ENOMEM; |
int error = -ENOMEM; |
726 |
|
ee->r.type = CCS_MAC_ENVIRON; |
727 |
|
ee->r.mode = ccs_get_mode(ccs_current_domain()->profile, |
728 |
|
CCS_MAC_ENVIRON); |
729 |
if (!r->mode || !envp_count) |
if (!r->mode || !envp_count) |
730 |
return 0; |
return 0; |
731 |
|
arg_ptr = kzalloc(CCS_EXEC_TMPSIZE, CCS_GFP_FLAGS); |
732 |
|
if (!arg_ptr) |
733 |
|
goto out; |
734 |
while (error == -ENOMEM) { |
while (error == -ENOMEM) { |
735 |
if (!ccs_dump_page(bprm, pos, &ee->dump)) |
if (!ccs_dump_page(bprm, pos, &env_page)) |
736 |
goto out; |
goto out; |
737 |
pos += PAGE_SIZE - offset; |
pos += PAGE_SIZE - offset; |
738 |
/* Read. */ |
/* Read. */ |
739 |
while (argv_count && offset < PAGE_SIZE) { |
while (argv_count && offset < PAGE_SIZE) { |
740 |
const char *kaddr = ee->dump.data; |
if (!env_page.data[offset++]) |
|
if (!kaddr[offset++]) |
|
741 |
argv_count--; |
argv_count--; |
742 |
} |
} |
743 |
if (argv_count) { |
if (argv_count) { |
745 |
continue; |
continue; |
746 |
} |
} |
747 |
while (offset < PAGE_SIZE) { |
while (offset < PAGE_SIZE) { |
748 |
const char *kaddr = ee->dump.data; |
const unsigned char c = env_page.data[offset++]; |
|
const unsigned char c = kaddr[offset++]; |
|
749 |
if (c && arg_len < CCS_EXEC_TMPSIZE - 10) { |
if (c && arg_len < CCS_EXEC_TMPSIZE - 10) { |
750 |
if (c == '=') { |
if (c == '=') { |
751 |
arg_ptr[arg_len++] = '\0'; |
arg_ptr[arg_len++] = '\0'; |
781 |
out: |
out: |
782 |
if (r->mode != 3) |
if (r->mode != 3) |
783 |
error = 0; |
error = 0; |
784 |
|
kfree(env_page.data); |
785 |
|
kfree(arg_ptr); |
786 |
return error; |
return error; |
787 |
} |
} |
788 |
|
|
833 |
* |
* |
834 |
* Returns number of directories to strip. |
* Returns number of directories to strip. |
835 |
*/ |
*/ |
836 |
static inline int ccs_root_depth(struct dentry *dentry, struct vfsmount *vfsmnt) |
static int ccs_root_depth(struct dentry *dentry, struct vfsmount *vfsmnt) |
837 |
{ |
{ |
838 |
int depth = 0; |
int depth = 0; |
839 |
ccs_realpath_lock(); |
ccs_realpath_lock(); |
887 |
return depth; |
return depth; |
888 |
} |
} |
889 |
|
|
|
static LIST_HEAD(ccs_execve_list); |
|
|
static DEFINE_SPINLOCK(ccs_execve_list_lock); |
|
|
|
|
|
/** |
|
|
* ccs_allocate_execve_entry - Allocate memory for execve(). |
|
|
* |
|
|
* Returns pointer to "struct ccs_execve_entry" on success, NULL otherwise. |
|
|
*/ |
|
|
static struct ccs_execve_entry *ccs_allocate_execve_entry(void) |
|
|
{ |
|
|
struct ccs_execve_entry *ee = kzalloc(sizeof(*ee), GFP_KERNEL); |
|
|
if (!ee) |
|
|
return NULL; |
|
|
ee->tmp = kzalloc(CCS_EXEC_TMPSIZE, GFP_KERNEL); |
|
|
if (!ee->tmp) { |
|
|
kfree(ee); |
|
|
return NULL; |
|
|
} |
|
|
ee->reader_idx = ccs_read_lock(); |
|
|
/* ee->dump->data is allocated by ccs_dump_page(). */ |
|
|
ee->task = current; |
|
|
spin_lock(&ccs_execve_list_lock); |
|
|
list_add(&ee->list, &ccs_execve_list); |
|
|
spin_unlock(&ccs_execve_list_lock); |
|
|
return ee; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_find_execve_entry - Find ccs_execve_entry of current process. |
|
|
* |
|
|
* Returns pointer to "struct ccs_execve_entry" on success, NULL otherwise. |
|
|
*/ |
|
|
static struct ccs_execve_entry *ccs_find_execve_entry(void) |
|
|
{ |
|
|
struct task_struct *task = current; |
|
|
struct ccs_execve_entry *ee = NULL; |
|
|
struct ccs_execve_entry *p; |
|
|
spin_lock(&ccs_execve_list_lock); |
|
|
list_for_each_entry(p, &ccs_execve_list, list) { |
|
|
if (p->task != task) |
|
|
continue; |
|
|
ee = p; |
|
|
break; |
|
|
} |
|
|
spin_unlock(&ccs_execve_list_lock); |
|
|
return ee; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_free_execve_entry - Free memory for execve(). |
|
|
* |
|
|
* @ee: Pointer to "struct ccs_execve_entry". |
|
|
*/ |
|
|
static void ccs_free_execve_entry(struct ccs_execve_entry *ee) |
|
|
{ |
|
|
if (!ee) |
|
|
return; |
|
|
spin_lock(&ccs_execve_list_lock); |
|
|
list_del(&ee->list); |
|
|
spin_unlock(&ccs_execve_list_lock); |
|
|
kfree(ee->handler_path); |
|
|
kfree(ee->tmp); |
|
|
kfree(ee->dump.data); |
|
|
ccs_read_unlock(ee->reader_idx); |
|
|
kfree(ee); |
|
|
} |
|
|
|
|
890 |
/** |
/** |
891 |
* ccs_try_alt_exec - Try to start execute handler. |
* ccs_try_alt_exec - Try to start execute handler. |
892 |
* |
* |
940 |
struct task_struct *task = current; |
struct task_struct *task = current; |
941 |
|
|
942 |
/* Close the requested program's dentry. */ |
/* Close the requested program's dentry. */ |
943 |
|
ee->obj.path1.dentry = NULL; |
944 |
|
ee->obj.path1.mnt = NULL; |
945 |
|
ee->obj.validate_done = false; |
946 |
allow_write_access(bprm->file); |
allow_write_access(bprm->file); |
947 |
fput(bprm->file); |
fput(bprm->file); |
948 |
bprm->file = NULL; |
bprm->file = NULL; |
990 |
"pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " |
"pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " |
991 |
"sgid=%d fsuid=%d fsgid=%d state[0]=%u " |
"sgid=%d fsuid=%d fsgid=%d state[0]=%u " |
992 |
"state[1]=%u state[2]=%u", |
"state[1]=%u state[2]=%u", |
993 |
(pid_t) sys_getpid(), current_uid(), current_gid(), |
(pid_t) ccsecurity_exports.sys_getpid(), |
994 |
current_euid(), current_egid(), current_suid(), |
current_uid(), current_gid(), current_euid(), |
995 |
current_sgid(), current_fsuid(), current_fsgid(), |
current_egid(), current_suid(), current_sgid(), |
996 |
|
current_fsuid(), current_fsgid(), |
997 |
(u8) (ccs_flags >> 24), (u8) (ccs_flags >> 16), |
(u8) (ccs_flags >> 24), (u8) (ccs_flags >> 16), |
998 |
(u8) (ccs_flags >> 8)); |
(u8) (ccs_flags >> 8)); |
999 |
retval = copy_strings_kernel(1, &cp, bprm); |
retval = copy_strings_kernel(1, &cp, bprm); |
1033 |
{ |
{ |
1034 |
int depth = ccs_get_root_depth(); |
int depth = ccs_get_root_depth(); |
1035 |
int len = ee->handler->total_len + 1; |
int len = ee->handler->total_len + 1; |
1036 |
char *cp = kmalloc(len, GFP_KERNEL); |
char *cp = kmalloc(len, CCS_GFP_FLAGS); |
1037 |
if (!cp) { |
if (!cp) { |
1038 |
retval = ENOMEM; |
retval = -ENOMEM; |
1039 |
goto out; |
goto out; |
1040 |
} |
} |
1041 |
ee->handler_path = cp; |
ee->handler_path = cp; |
1064 |
#endif |
#endif |
1065 |
#endif |
#endif |
1066 |
|
|
1067 |
/* OK, now restart the process with execute handler program's dentry. */ |
/* |
1068 |
|
* OK, now restart the process with execute handler program's dentry. |
1069 |
|
*/ |
1070 |
filp = open_exec(ee->handler_path); |
filp = open_exec(ee->handler_path); |
1071 |
if (IS_ERR(filp)) { |
if (IS_ERR(filp)) { |
1072 |
retval = PTR_ERR(filp); |
retval = PTR_ERR(filp); |
1073 |
goto out; |
goto out; |
1074 |
} |
} |
1075 |
|
ee->obj.path1.dentry = filp->f_dentry; |
1076 |
|
ee->obj.path1.mnt = filp->f_vfsmnt; |
1077 |
bprm->file = filp; |
bprm->file = filp; |
1078 |
bprm->filename = ee->handler_path; |
bprm->filename = ee->handler_path; |
1079 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
1103 |
const u8 type) |
const u8 type) |
1104 |
{ |
{ |
1105 |
struct task_struct *task = current; |
struct task_struct *task = current; |
1106 |
const struct ccs_domain_info *domain = ccs_current_domain(); |
const struct ccs_domain_info * const domain = ccs_current_domain(); |
1107 |
struct ccs_acl_info *ptr; |
struct ccs_acl_info *ptr; |
1108 |
bool found = false; |
bool found = false; |
1109 |
/* |
/* |
1119 |
acl = container_of(ptr, struct ccs_execute_handler_record, |
acl = container_of(ptr, struct ccs_execute_handler_record, |
1120 |
head); |
head); |
1121 |
ee->handler = acl->handler; |
ee->handler = acl->handler; |
1122 |
|
ee->handler_type = type; |
1123 |
found = true; |
found = true; |
1124 |
break; |
break; |
1125 |
} |
} |
1139 |
struct ccs_page_dump *dump) |
struct ccs_page_dump *dump) |
1140 |
{ |
{ |
1141 |
struct page *page; |
struct page *page; |
1142 |
/* dump->data is released by ccs_free_execve_entry(). */ |
/* dump->data is released by ccs_finish_execve(). */ |
1143 |
if (!dump->data) { |
if (!dump->data) { |
1144 |
dump->data = kzalloc(PAGE_SIZE, GFP_KERNEL); |
dump->data = kzalloc(PAGE_SIZE, CCS_GFP_FLAGS); |
1145 |
if (!dump->data) |
if (!dump->data) |
1146 |
return false; |
return false; |
1147 |
} |
} |
1149 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
1150 |
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
1151 |
return false; |
return false; |
1152 |
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR == 3 && defined(CONFIG_MMU) |
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR >= 3 && defined(CONFIG_MMU) |
1153 |
|
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
1154 |
|
return false; |
1155 |
|
#elif defined(AX_MAJOR) && AX_MAJOR == 3 && defined(AX_MINOR) && AX_MINOR >= 2 && defined(CONFIG_MMU) |
1156 |
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
1157 |
return false; |
return false; |
1158 |
#else |
#else |
1167 |
*/ |
*/ |
1168 |
char *kaddr = kmap_atomic(page, KM_USER0); |
char *kaddr = kmap_atomic(page, KM_USER0); |
1169 |
dump->page = page; |
dump->page = page; |
1170 |
memcpy(dump->data + offset, kaddr + offset, PAGE_SIZE - offset); |
memcpy(dump->data + offset, kaddr + offset, |
1171 |
|
PAGE_SIZE - offset); |
1172 |
kunmap_atomic(kaddr, KM_USER0); |
kunmap_atomic(kaddr, KM_USER0); |
1173 |
} |
} |
1174 |
/* Same with put_arg_page(page) in fs/exec.c */ |
/* Same with put_arg_page(page) in fs/exec.c */ |
1175 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
1176 |
put_page(page); |
put_page(page); |
1177 |
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR == 3 && defined(CONFIG_MMU) |
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR >= 3 && defined(CONFIG_MMU) |
1178 |
|
put_page(page); |
1179 |
|
#elif defined(AX_MAJOR) && AX_MAJOR == 3 && defined(AX_MINOR) && AX_MINOR >= 2 && defined(CONFIG_MMU) |
1180 |
put_page(page); |
put_page(page); |
1181 |
#endif |
#endif |
1182 |
return true; |
return true; |
1183 |
} |
} |
1184 |
|
|
1185 |
/** |
/** |
|
* ccs_fetch_next_domain - Fetch next_domain from the list. |
|
|
* |
|
|
* Returns pointer to "struct ccs_domain_info" which will be used if execve() |
|
|
* succeeds. This function does not return NULL. |
|
|
*/ |
|
|
struct ccs_domain_info *ccs_fetch_next_domain(void) |
|
|
{ |
|
|
struct ccs_execve_entry *ee = ccs_find_execve_entry(); |
|
|
struct ccs_domain_info *next_domain = NULL; |
|
|
if (ee) |
|
|
next_domain = ee->r.domain; |
|
|
if (!next_domain) |
|
|
next_domain = ccs_current_domain(); |
|
|
return next_domain; |
|
|
} |
|
|
|
|
|
/** |
|
1186 |
* ccs_start_execve - Prepare for execve() operation. |
* ccs_start_execve - Prepare for execve() operation. |
1187 |
* |
* |
1188 |
* @bprm: Pointer to "struct linux_binprm". |
* @bprm: Pointer to "struct linux_binprm". |
1189 |
|
* @eep: Pointer to "struct ccs_execve_entry *". |
1190 |
* |
* |
1191 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
1192 |
*/ |
*/ |
1193 |
int ccs_start_execve(struct linux_binprm *bprm) |
static int ccs_start_execve(struct linux_binprm *bprm, |
1194 |
|
struct ccs_execve_entry **eep) |
1195 |
{ |
{ |
1196 |
int retval; |
int retval; |
1197 |
struct task_struct *task = current; |
struct task_struct *task = current; |
1198 |
struct ccs_execve_entry *ee = ccs_allocate_execve_entry(); |
struct ccs_execve_entry *ee; |
1199 |
if (!ccs_policy_loaded) |
*eep = NULL; |
1200 |
ccs_load_policy(bprm->filename); |
ee = kzalloc(sizeof(*ee), CCS_GFP_FLAGS); |
1201 |
if (!ee) |
if (!ee) |
1202 |
return -ENOMEM; |
return -ENOMEM; |
1203 |
ccs_init_request_info(&ee->r, NULL, CCS_MAC_FILE_EXECUTE); |
ee->tmp = kzalloc(CCS_EXEC_TMPSIZE, CCS_GFP_FLAGS); |
1204 |
|
if (!ee->tmp) { |
1205 |
|
kfree(ee); |
1206 |
|
return -ENOMEM; |
1207 |
|
} |
1208 |
|
ee->reader_idx = ccs_read_lock(); |
1209 |
|
/* ee->dump->data is allocated by ccs_dump_page(). */ |
1210 |
|
ee->previous_domain = task->ccs_domain_info; |
1211 |
|
/* Clear manager flag. */ |
1212 |
|
task->ccs_flags &= ~CCS_TASK_IS_POLICY_MANAGER; |
1213 |
|
*eep = ee; |
1214 |
|
ccs_init_request_info(&ee->r, CCS_MAC_FILE_EXECUTE); |
1215 |
ee->r.ee = ee; |
ee->r.ee = ee; |
1216 |
ee->bprm = bprm; |
ee->bprm = bprm; |
1217 |
ee->r.obj = &ee->obj; |
ee->r.obj = &ee->obj; |
1218 |
ee->obj.path1.dentry = bprm->file->f_dentry; |
ee->obj.path1.dentry = bprm->file->f_dentry; |
1219 |
ee->obj.path1.mnt = bprm->file->f_vfsmnt; |
ee->obj.path1.mnt = bprm->file->f_vfsmnt; |
1220 |
/* Clear manager flag. */ |
/* |
1221 |
task->ccs_flags &= ~CCS_TASK_IS_POLICY_MANAGER; |
* No need to call ccs_environ() for execute handler because envp[] is |
1222 |
if (ccs_find_execute_handler(ee, CCS_TYPE_EXECUTE_HANDLER)) { |
* moved to argv[]. |
1223 |
retval = ccs_try_alt_exec(ee); |
*/ |
1224 |
if (!retval) |
if (ccs_find_execute_handler(ee, CCS_TYPE_EXECUTE_HANDLER)) |
1225 |
ccs_audit_execute_handler_log(ee, true); |
return ccs_try_alt_exec(ee); |
|
goto ok; |
|
|
} |
|
1226 |
retval = ccs_find_next_domain(ee); |
retval = ccs_find_next_domain(ee); |
1227 |
if (retval != -EPERM) |
if (retval == -EPERM) { |
1228 |
goto ok; |
if (ccs_find_execute_handler(ee, |
1229 |
if (ccs_find_execute_handler(ee, CCS_TYPE_DENIED_EXECUTE_HANDLER)) { |
CCS_TYPE_DENIED_EXECUTE_HANDLER)) |
1230 |
retval = ccs_try_alt_exec(ee); |
return ccs_try_alt_exec(ee); |
|
if (!retval) |
|
|
ccs_audit_execute_handler_log(ee, false); |
|
1231 |
} |
} |
1232 |
ok: |
if (!retval) |
1233 |
if (retval < 0) |
retval = ccs_environ(ee); |
|
goto out; |
|
|
ee->r.mode = ccs_get_mode(ee->r.profile, CCS_MAC_ENVIRON); |
|
|
retval = ccs_environ(ee); |
|
|
if (retval < 0) |
|
|
goto out; |
|
|
task->ccs_flags |= CCS_CHECK_READ_FOR_OPEN_EXEC; |
|
|
retval = 0; |
|
|
out: |
|
|
if (retval) |
|
|
ccs_finish_execve(retval); |
|
1234 |
return retval; |
return retval; |
1235 |
} |
} |
1236 |
|
|
1238 |
* ccs_finish_execve - Clean up execve() operation. |
* ccs_finish_execve - Clean up execve() operation. |
1239 |
* |
* |
1240 |
* @retval: Return code of an execve() operation. |
* @retval: Return code of an execve() operation. |
1241 |
|
* @ee: Pointer to "struct ccs_execve_entry". |
1242 |
* |
* |
1243 |
* Caller holds ccs_read_lock(). |
* Caller holds ccs_read_lock(). |
1244 |
*/ |
*/ |
1245 |
void ccs_finish_execve(int retval) |
static void ccs_finish_execve(int retval, struct ccs_execve_entry *ee) |
1246 |
{ |
{ |
1247 |
struct task_struct *task = current; |
struct task_struct *task = current; |
|
struct ccs_execve_entry *ee = ccs_find_execve_entry(); |
|
|
task->ccs_flags &= ~CCS_CHECK_READ_FOR_OPEN_EXEC; |
|
1248 |
if (!ee) |
if (!ee) |
1249 |
return; |
return; |
1250 |
if (retval < 0) |
if (retval < 0) { |
1251 |
goto out; |
task->ccs_domain_info = ee->previous_domain; |
1252 |
/* Proceed to next domain if execution suceeded. */ |
/* |
1253 |
task->ccs_domain_info = ee->r.domain; |
* Make task->ccs_domain_info visible to GC before changing |
1254 |
/* Mark the current process as execute handler. */ |
* task->ccs_flags . |
1255 |
if (ee->handler) |
*/ |
1256 |
task->ccs_flags |= CCS_TASK_IS_EXECUTE_HANDLER; |
smp_mb(); |
1257 |
/* Mark the current process as normal process. */ |
} else { |
1258 |
else |
/* Mark the current process as execute handler. */ |
1259 |
task->ccs_flags &= ~CCS_TASK_IS_EXECUTE_HANDLER; |
if (ee->handler) |
1260 |
out: |
task->ccs_flags |= CCS_TASK_IS_EXECUTE_HANDLER; |
1261 |
ccs_free_execve_entry(ee); |
/* Mark the current process as normal process. */ |
1262 |
|
else |
1263 |
|
task->ccs_flags &= ~CCS_TASK_IS_EXECUTE_HANDLER; |
1264 |
|
} |
1265 |
|
/* Tell GC that I finished execve(). */ |
1266 |
|
task->ccs_flags &= ~CCS_TASK_IS_IN_EXECVE; |
1267 |
|
ccs_read_unlock(ee->reader_idx); |
1268 |
|
kfree(ee->handler_path); |
1269 |
|
kfree(ee->tmp); |
1270 |
|
kfree(ee->dump.data); |
1271 |
|
kfree(ee); |
1272 |
|
} |
1273 |
|
|
1274 |
|
/** |
1275 |
|
* ccs_may_transit - Check permission and do domain transition without execve(). |
1276 |
|
* |
1277 |
|
* @domainname: Domainname to transit to. |
1278 |
|
* @pathname: Pathname to check. |
1279 |
|
* |
1280 |
|
* Returns 0 on success, negative value otherwise. |
1281 |
|
* |
1282 |
|
* Caller holds ccs_read_lock(). |
1283 |
|
*/ |
1284 |
|
int ccs_may_transit(const char *domainname, const char *pathname) |
1285 |
|
{ |
1286 |
|
struct ccs_path_info name; |
1287 |
|
struct ccs_request_info r; |
1288 |
|
struct ccs_domain_info *domain; |
1289 |
|
int error; |
1290 |
|
bool domain_created = false; |
1291 |
|
name.name = pathname; |
1292 |
|
ccs_fill_path_info(&name); |
1293 |
|
/* Check allow_transit permission. */ |
1294 |
|
ccs_init_request_info(&r, CCS_MAC_FILE_TRANSIT); |
1295 |
|
error = ccs_path_permission(&r, CCS_TYPE_TRANSIT, &name); |
1296 |
|
if (error) |
1297 |
|
return error; |
1298 |
|
/* Check destination domain. */ |
1299 |
|
domain = ccs_find_domain(domainname); |
1300 |
|
if (!domain && r.mode != CCS_CONFIG_ENFORCING && |
1301 |
|
strlen(domainname) < CCS_EXEC_TMPSIZE - 10) { |
1302 |
|
domain = ccs_find_or_assign_new_domain(domainname, r.profile); |
1303 |
|
if (domain) |
1304 |
|
domain_created = true; |
1305 |
|
} |
1306 |
|
if (domain) { |
1307 |
|
error = 0; |
1308 |
|
current->ccs_domain_info = domain; |
1309 |
|
if (domain_created) |
1310 |
|
ccs_audit_domain_creation_log(); |
1311 |
|
} else { |
1312 |
|
error = -ENOENT; |
1313 |
|
} |
1314 |
|
return error; |
1315 |
|
} |
1316 |
|
|
1317 |
|
static int __ccs_search_binary_handler(struct linux_binprm *bprm, |
1318 |
|
struct pt_regs *regs) |
1319 |
|
{ |
1320 |
|
struct ccs_execve_entry *ee; |
1321 |
|
int retval; |
1322 |
|
if (!ccs_policy_loaded) |
1323 |
|
ccsecurity_exports.load_policy(bprm->filename); |
1324 |
|
retval = ccs_start_execve(bprm, &ee); |
1325 |
|
if (!retval) |
1326 |
|
retval = search_binary_handler(bprm, regs); |
1327 |
|
ccs_finish_execve(retval, ee); |
1328 |
|
return retval; |
1329 |
|
} |
1330 |
|
|
1331 |
|
void __init ccs_domain_init(void) |
1332 |
|
{ |
1333 |
|
ccsecurity_ops.search_binary_handler = __ccs_search_binary_handler; |
1334 |
} |
} |