1 |
/* |
/* |
2 |
* fs/tomoyo_domain.c |
* security/ccsecurity/domain.c |
3 |
* |
* |
4 |
* Implementation of the Domain-Based Mandatory Access Control. |
* Copyright (C) 2005-2010 NTT DATA CORPORATION |
5 |
* |
* |
6 |
* Copyright (C) 2005-2008 NTT DATA CORPORATION |
* Version: 1.7.2+ 2010/06/04 |
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* |
|
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* Version: 1.5.3-pre 2008/01/02 |
|
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. |
10 |
* |
* |
11 |
*/ |
*/ |
|
/***** TOMOYO Linux start. *****/ |
|
12 |
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13 |
#include <linux/ccs_common.h> |
#include <linux/slab.h> |
|
#include <linux/tomoyo.h> |
|
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#include <linux/realpath.h> |
|
14 |
#include <linux/highmem.h> |
#include <linux/highmem.h> |
15 |
#include <linux/binfmts.h> |
#include <linux/version.h> |
16 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
17 |
#ifndef for_each_process |
#include <linux/namei.h> |
18 |
#define for_each_process for_each_task |
#include <linux/mount.h> |
19 |
#endif |
#endif |
20 |
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30) |
21 |
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#include <linux/fs_struct.h> |
22 |
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#endif |
23 |
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#include "internal.h" |
24 |
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|
25 |
/************************* VARIABLES *************************/ |
/* Variables definitions.*/ |
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/* The initial domain. */ |
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struct domain_info KERNEL_DOMAIN; |
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/* List of domains. */ |
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LIST1_HEAD(domain_list); |
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/* /sbin/init started? */ |
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extern int sbin_init_started; |
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#ifdef CONFIG_TOMOYO |
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/* Lock for appending domain's ACL. */ |
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DEFINE_MUTEX(domain_acl_lock); |
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/************************* UTILITY FUNCTIONS *************************/ |
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/***** The structure for program files to force domain reconstruction. *****/ |
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struct domain_initializer_entry { |
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struct list1_head list; |
|
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const struct path_info *domainname; /* This may be NULL */ |
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const struct path_info *program; |
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bool is_deleted; |
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bool is_not; |
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bool is_last_name; |
|
|
}; |
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/***** The structure for domains to not to transit domains. *****/ |
|
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|
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struct domain_keeper_entry { |
|
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struct list1_head list; |
|
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const struct path_info *domainname; |
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const struct path_info *program; /* This may be NULL */ |
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bool is_deleted; |
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bool is_not; |
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bool is_last_name; |
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}; |
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/***** The structure for program files that should be aggregated. *****/ |
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struct aggregator_entry { |
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struct list1_head list; |
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const struct path_info *original_name; |
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const struct path_info *aggregated_name; |
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bool is_deleted; |
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}; |
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/***** The structure for program files that should be aliased. *****/ |
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struct alias_entry { |
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struct list1_head list; |
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const struct path_info *original_name; |
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const struct path_info *aliased_name; |
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bool is_deleted; |
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}; |
|
26 |
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27 |
/************************* VARIABLES *************************/ |
/* The global domain. */ |
28 |
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struct ccs_domain_info ccs_global_domain; |
29 |
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|
30 |
/* Domain creation lock. */ |
/* The initial domain. */ |
31 |
static DEFINE_MUTEX(new_domain_assign_lock); |
struct ccs_domain_info ccs_kernel_domain; |
32 |
|
|
33 |
/************************* UTILITY FUNCTIONS *************************/ |
/* The list for "struct ccs_domain_info". */ |
34 |
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LIST_HEAD(ccs_domain_list); |
35 |
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|
36 |
const char *GetLastName(const struct domain_info *domain) |
struct list_head ccs_policy_list[CCS_MAX_POLICY]; |
37 |
{ |
struct list_head ccs_group_list[CCS_MAX_GROUP]; |
38 |
const char *cp0 = domain->domainname->name, *cp1; |
struct list_head ccs_shared_list[CCS_MAX_LIST]; |
|
if ((cp1 = strrchr(cp0, ' ')) != NULL) return cp1 + 1; |
|
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return cp0; |
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} |
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39 |
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40 |
int AddDomainACL(struct domain_info *domain, struct acl_info *acl) |
/** |
41 |
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* ccs_audit_execute_handler_log - Audit execute_handler log. |
42 |
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* |
43 |
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* @ee: Pointer to "struct ccs_execve". |
44 |
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* |
45 |
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* Returns 0 on success, negative value otherwise. |
46 |
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*/ |
47 |
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static int ccs_audit_execute_handler_log(struct ccs_execve *ee) |
48 |
{ |
{ |
49 |
list1_add_tail_mb(&acl->list, &domain->acl_info_list); |
struct ccs_request_info *r = &ee->r; |
50 |
UpdateCounter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
const char *handler = ee->handler->name; |
51 |
return 0; |
r->type = CCS_MAC_FILE_EXECUTE; |
52 |
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r->mode = ccs_get_mode(r->profile, CCS_MAC_FILE_EXECUTE); |
53 |
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r->granted = true; |
54 |
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return ccs_write_log(r, "%s %s\n", ee->handler_type == |
55 |
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CCS_TYPE_DENIED_EXECUTE_HANDLER ? |
56 |
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CCS_KEYWORD_DENIED_EXECUTE_HANDLER : |
57 |
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CCS_KEYWORD_EXECUTE_HANDLER, handler); |
58 |
} |
} |
59 |
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|
60 |
int DelDomainACL(struct acl_info *ptr) |
/** |
61 |
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* ccs_audit_domain_creation_log - Audit domain creation log. |
62 |
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* |
63 |
|
* Returns 0 on success, negative value otherwise. |
64 |
|
*/ |
65 |
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static int ccs_audit_domain_creation_log(void) |
66 |
{ |
{ |
67 |
ptr->is_deleted = 1; |
struct ccs_request_info r; |
68 |
UpdateCounter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
ccs_init_request_info(&r, CCS_MAC_FILE_EXECUTE); |
69 |
return 0; |
r.granted = false; |
70 |
|
return ccs_write_log(&r, "use_profile %u\n", r.profile); |
71 |
} |
} |
72 |
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|
73 |
/************************* DOMAIN INITIALIZER HANDLER *************************/ |
/** |
74 |
|
* ccs_update_policy - Update an entry for exception policy. |
75 |
static LIST1_HEAD(domain_initializer_list); |
* |
76 |
|
* @new_entry: Pointer to "struct ccs_acl_info". |
77 |
static int AddDomainInitializerEntry(const char *domainname, const char *program, const bool is_not, const bool is_delete) |
* @size: Size of @new_entry in bytes. |
78 |
{ |
* @is_delete: True if it is a delete request. |
79 |
struct domain_initializer_entry *new_entry, *ptr; |
* @list: Pointer to "struct list_head". |
80 |
static DEFINE_MUTEX(lock); |
* @check_duplicate: Callback function to find duplicated entry. |
81 |
const struct path_info *saved_program, *saved_domainname = NULL; |
* |
82 |
int error = -ENOMEM; |
* Returns 0 on success, negative value otherwise. |
83 |
bool is_last_name = 0; |
* |
84 |
if (!IsCorrectPath(program, 1, -1, -1, __FUNCTION__)) return -EINVAL; /* No patterns allowed. */ |
* Caller holds ccs_read_lock(). |
85 |
if (domainname) { |
*/ |
86 |
if (!IsDomainDef(domainname) && IsCorrectPath(domainname, 1, -1, -1, __FUNCTION__)) { |
int ccs_update_policy(struct ccs_acl_head *new_entry, const int size, |
87 |
is_last_name = 1; |
bool is_delete, struct list_head *list, |
88 |
} else if (!IsCorrectDomain(domainname, __FUNCTION__)) { |
bool (*check_duplicate) (const struct ccs_acl_head *, |
89 |
return -EINVAL; |
const struct ccs_acl_head *)) |
90 |
} |
{ |
91 |
if ((saved_domainname = SaveName(domainname)) == NULL) return -ENOMEM; |
int error = is_delete ? -ENOENT : -ENOMEM; |
92 |
|
struct ccs_acl_head *entry; |
93 |
|
if (mutex_lock_interruptible(&ccs_policy_lock)) |
94 |
|
return -ENOMEM; |
95 |
|
list_for_each_entry_rcu(entry, list, list) { |
96 |
|
if (!check_duplicate(entry, new_entry)) |
97 |
|
continue; |
98 |
|
entry->is_deleted = is_delete; |
99 |
|
error = 0; |
100 |
|
break; |
101 |
} |
} |
102 |
if ((saved_program = SaveName(program)) == NULL) return -ENOMEM; |
if (error && !is_delete) { |
103 |
mutex_lock(&lock); |
entry = ccs_commit_ok(new_entry, size); |
104 |
list1_for_each_entry(ptr, &domain_initializer_list, list) { |
if (entry) { |
105 |
if (ptr->is_not == is_not && ptr->domainname == saved_domainname && ptr->program == saved_program) { |
list_add_tail_rcu(&entry->list, list); |
|
ptr->is_deleted = is_delete; |
|
106 |
error = 0; |
error = 0; |
|
goto out; |
|
107 |
} |
} |
108 |
} |
} |
109 |
if (is_delete) { |
mutex_unlock(&ccs_policy_lock); |
|
error = -ENOENT; |
|
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goto out; |
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} |
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if ((new_entry = alloc_element(sizeof(*new_entry))) == NULL) goto out; |
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new_entry->domainname = saved_domainname; |
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new_entry->program = saved_program; |
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new_entry->is_not = is_not; |
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new_entry->is_last_name = is_last_name; |
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list1_add_tail_mb(&new_entry->list, &domain_initializer_list); |
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error = 0; |
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out: |
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mutex_unlock(&lock); |
|
110 |
return error; |
return error; |
111 |
} |
} |
112 |
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113 |
int ReadDomainInitializerPolicy(struct io_buffer *head) |
static void ccs_delete_type(struct ccs_domain_info *domain, u8 type) |
114 |
{ |
{ |
115 |
struct list1_head *pos; |
struct ccs_acl_info *ptr; |
116 |
list1_for_each_cookie(pos, head->read_var2, &domain_initializer_list) { |
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
117 |
struct domain_initializer_entry *ptr; |
if (ptr->type == type) |
118 |
ptr = list1_entry(pos, struct domain_initializer_entry, list); |
ptr->is_deleted = true; |
|
if (ptr->is_deleted) continue; |
|
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if (ptr->domainname) { |
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if (io_printf(head, "%s" KEYWORD_INITIALIZE_DOMAIN "%s from %s\n", ptr->is_not ? "no_" : "", ptr->program->name, ptr->domainname->name)) return -ENOMEM; |
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} else { |
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if (io_printf(head, "%s" KEYWORD_INITIALIZE_DOMAIN "%s\n", ptr->is_not ? "no_" : "", ptr->program->name)) return -ENOMEM; |
|
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} |
|
119 |
} |
} |
|
return 0; |
|
120 |
} |
} |
121 |
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|
122 |
int AddDomainInitializerPolicy(char *data, const bool is_not, const bool is_delete) |
/** |
123 |
{ |
* ccs_update_domain - Update an entry for domain policy. |
124 |
char *cp = strstr(data, " from "); |
* |
125 |
if (cp) { |
* @new_entry: Pointer to "struct ccs_acl_info". |
126 |
*cp = '\0'; |
* @size: Size of @new_entry in bytes. |
127 |
return AddDomainInitializerEntry(cp + 6, data, is_not, is_delete); |
* @is_delete: True if it is a delete request. |
128 |
} else { |
* @domain: Pointer to "struct ccs_domain_info". |
129 |
return AddDomainInitializerEntry(NULL, data, is_not, is_delete); |
* @check_duplicate: Callback function to find duplicated entry. |
130 |
|
* @merge_duplicate: Callback function to merge duplicated entry. |
131 |
|
* |
132 |
|
* Returns 0 on success, negative value otherwise. |
133 |
|
* |
134 |
|
* Caller holds ccs_read_lock(). |
135 |
|
*/ |
136 |
|
int ccs_update_domain(struct ccs_acl_info *new_entry, const int size, |
137 |
|
bool is_delete, struct ccs_domain_info *domain, |
138 |
|
bool (*check_duplicate) (const struct ccs_acl_info *, |
139 |
|
const struct ccs_acl_info *), |
140 |
|
bool (*merge_duplicate) (struct ccs_acl_info *, |
141 |
|
struct ccs_acl_info *, |
142 |
|
const bool)) |
143 |
|
{ |
144 |
|
int error = is_delete ? -ENOENT : -ENOMEM; |
145 |
|
struct ccs_acl_info *entry; |
146 |
|
/* |
147 |
|
* Only one "execute_handler" and "denied_execute_handler" can exist |
148 |
|
* in a domain. |
149 |
|
*/ |
150 |
|
const u8 type = new_entry->type; |
151 |
|
const bool exclusive = !is_delete && |
152 |
|
(type == CCS_TYPE_EXECUTE_HANDLER || |
153 |
|
type == CCS_TYPE_DENIED_EXECUTE_HANDLER); |
154 |
|
if (mutex_lock_interruptible(&ccs_policy_lock)) |
155 |
|
return error; |
156 |
|
list_for_each_entry_rcu(entry, &domain->acl_info_list, list) { |
157 |
|
if (!check_duplicate(entry, new_entry)) |
158 |
|
continue; |
159 |
|
if (exclusive) |
160 |
|
ccs_delete_type(domain, type); |
161 |
|
if (merge_duplicate) |
162 |
|
entry->is_deleted = merge_duplicate(entry, new_entry, |
163 |
|
is_delete); |
164 |
|
else |
165 |
|
entry->is_deleted = is_delete; |
166 |
|
error = 0; |
167 |
|
break; |
168 |
} |
} |
169 |
} |
if (error && !is_delete) { |
170 |
|
entry = ccs_commit_ok(new_entry, size); |
171 |
static bool IsDomainInitializer(const struct path_info *domainname, const struct path_info *program, const struct path_info *last_name) |
if (entry) { |
172 |
{ |
if (exclusive) |
173 |
struct domain_initializer_entry *ptr; |
ccs_delete_type(domain, type); |
174 |
bool flag = 0; |
if (entry->cond) |
175 |
list1_for_each_entry(ptr, &domain_initializer_list, list) { |
atomic_inc(&entry->cond->head.users); |
176 |
if (ptr->is_deleted) continue; |
list_add_tail_rcu(&entry->list, |
177 |
if (ptr->domainname) { |
&domain->acl_info_list); |
178 |
if (!ptr->is_last_name) { |
error = 0; |
|
if (ptr->domainname != domainname) continue; |
|
|
} else { |
|
|
if (pathcmp(ptr->domainname, last_name)) continue; |
|
|
} |
|
179 |
} |
} |
|
if (pathcmp(ptr->program, program)) continue; |
|
|
if (ptr->is_not) return 0; |
|
|
flag = 1; |
|
180 |
} |
} |
181 |
return flag; |
mutex_unlock(&ccs_policy_lock); |
182 |
|
return error; |
183 |
} |
} |
184 |
|
|
185 |
/************************* DOMAIN KEEPER HANDLER *************************/ |
void ccs_check_acl(struct ccs_request_info *r, |
186 |
|
bool (*check_entry) (const struct ccs_request_info *, |
187 |
static LIST1_HEAD(domain_keeper_list); |
const struct ccs_acl_info *)) |
188 |
|
{ |
189 |
|
const struct ccs_domain_info *domain = ccs_current_domain(); |
190 |
|
struct ccs_acl_info *ptr; |
191 |
|
retry: |
192 |
|
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
193 |
|
if (ptr->is_deleted || ptr->type != r->param_type) |
194 |
|
continue; |
195 |
|
if (check_entry(r, ptr) && ccs_condition(r, ptr->cond)) { |
196 |
|
r->cond = ptr->cond; |
197 |
|
r->granted = true; |
198 |
|
return; |
199 |
|
} |
200 |
|
} |
201 |
|
if (domain != &ccs_global_domain && |
202 |
|
!domain->flags[CCS_DIF_IGNORE_GLOBAL] && |
203 |
|
(r->param_type != CCS_TYPE_PATH_ACL || |
204 |
|
r->param.path.operation != CCS_TYPE_READ || |
205 |
|
!domain->flags[CCS_DIF_IGNORE_GLOBAL_ALLOW_READ]) && |
206 |
|
(r->param_type != CCS_TYPE_ENV_ACL || |
207 |
|
!domain->flags[CCS_DIF_IGNORE_GLOBAL_ALLOW_ENV])) { |
208 |
|
domain = &ccs_global_domain; |
209 |
|
goto retry; |
210 |
|
} |
211 |
|
r->granted = false; |
212 |
|
} |
213 |
|
|
214 |
|
static bool ccs_same_transition_control(const struct ccs_acl_head *a, |
215 |
|
const struct ccs_acl_head *b) |
216 |
|
{ |
217 |
|
const struct ccs_transition_control *p1 = container_of(a, typeof(*p1), |
218 |
|
head); |
219 |
|
const struct ccs_transition_control *p2 = container_of(b, typeof(*p2), |
220 |
|
head); |
221 |
|
return p1->type == p2->type && p1->is_last_name == p2->is_last_name |
222 |
|
&& p1->domainname == p2->domainname |
223 |
|
&& p1->program == p2->program; |
224 |
|
} |
225 |
|
|
226 |
static int AddDomainKeeperEntry(const char *domainname, const char *program, const bool is_not, const bool is_delete) |
/** |
227 |
{ |
* ccs_update_transition_control_entry - Update "struct ccs_transition_control" list. |
228 |
struct domain_keeper_entry *new_entry, *ptr; |
* |
229 |
const struct path_info *saved_domainname, *saved_program = NULL; |
* @domainname: The name of domain. Maybe NULL. |
230 |
static DEFINE_MUTEX(lock); |
* @program: The name of program. Maybe NULL. |
231 |
int error = -ENOMEM; |
* @type: Type of transition. |
232 |
bool is_last_name = 0; |
* @is_delete: True if it is a delete request. |
233 |
if (!IsDomainDef(domainname) && IsCorrectPath(domainname, 1, -1, -1, __FUNCTION__)) { |
* |
234 |
is_last_name = 1; |
* Returns 0 on success, negative value otherwise. |
235 |
} else if (!IsCorrectDomain(domainname, __FUNCTION__)) { |
*/ |
236 |
return -EINVAL; |
static int ccs_update_transition_control_entry(const char *domainname, |
237 |
} |
const char *program, |
238 |
if (program) { |
const u8 type, |
239 |
if (!IsCorrectPath(program, 1, -1, -1, __FUNCTION__)) return -EINVAL; |
const bool is_delete) |
240 |
if ((saved_program = SaveName(program)) == NULL) return -ENOMEM; |
{ |
241 |
} |
struct ccs_transition_control e = { .type = type }; |
242 |
if ((saved_domainname = SaveName(domainname)) == NULL) return -ENOMEM; |
int error = is_delete ? -ENOENT : -ENOMEM; |
243 |
mutex_lock(&lock); |
if (program && strcmp(program, "any")) { |
244 |
list1_for_each_entry(ptr, &domain_keeper_list, list) { |
if (!ccs_correct_path(program)) |
245 |
if (ptr->is_not == is_not && ptr->domainname == saved_domainname && ptr->program == saved_program) { |
return -EINVAL; |
246 |
ptr->is_deleted = is_delete; |
e.program = ccs_get_name(program); |
247 |
error = 0; |
if (!e.program) |
248 |
goto out; |
goto out; |
|
} |
|
249 |
} |
} |
250 |
if (is_delete) { |
if (domainname && strcmp(domainname, "any")) { |
251 |
error = -ENOENT; |
if (!ccs_correct_domain(domainname)) { |
252 |
goto out; |
if (!ccs_correct_path(domainname)) |
253 |
|
goto out; |
254 |
|
e.is_last_name = true; |
255 |
|
} |
256 |
|
e.domainname = ccs_get_name(domainname); |
257 |
|
if (!e.domainname) |
258 |
|
goto out; |
259 |
} |
} |
260 |
if ((new_entry = alloc_element(sizeof(*new_entry))) == NULL) goto out; |
error = ccs_update_policy(&e.head, sizeof(e), is_delete, |
261 |
new_entry->domainname = saved_domainname; |
&ccs_policy_list[CCS_ID_TRANSITION_CONTROL], |
262 |
new_entry->program = saved_program; |
ccs_same_transition_control); |
|
new_entry->is_not = is_not; |
|
|
new_entry->is_last_name = is_last_name; |
|
|
list1_add_tail_mb(&new_entry->list, &domain_keeper_list); |
|
|
error = 0; |
|
263 |
out: |
out: |
264 |
mutex_unlock(&lock); |
ccs_put_name(e.domainname); |
265 |
|
ccs_put_name(e.program); |
266 |
return error; |
return error; |
267 |
} |
} |
268 |
|
|
269 |
int AddDomainKeeperPolicy(char *data, const bool is_not, const bool is_delete) |
/** |
270 |
|
* ccs_write_transition_control - Write "struct ccs_transition_control" list. |
271 |
|
* |
272 |
|
* @data: String to parse. |
273 |
|
* @is_delete: True if it is a delete request. |
274 |
|
* @type: Type of this entry. |
275 |
|
* |
276 |
|
* Returns 0 on success, negative value otherwise. |
277 |
|
*/ |
278 |
|
int ccs_write_transition_control(char *data, const bool is_delete, |
279 |
|
const u8 type) |
280 |
{ |
{ |
281 |
char *cp = strstr(data, " from "); |
char *domainname = strstr(data, " from "); |
282 |
if (cp) { |
if (domainname) { |
283 |
*cp = '\0'; |
*domainname = '\0'; |
284 |
return AddDomainKeeperEntry(cp + 6, data, is_not, is_delete); |
domainname += 6; |
285 |
} else { |
} else if (type == CCS_TRANSITION_CONTROL_NO_KEEP || |
286 |
return AddDomainKeeperEntry(data, NULL, is_not, is_delete); |
type == CCS_TRANSITION_CONTROL_KEEP) { |
287 |
|
domainname = data; |
288 |
|
data = NULL; |
289 |
} |
} |
290 |
|
return ccs_update_transition_control_entry(domainname, data, type, |
291 |
|
is_delete); |
292 |
} |
} |
293 |
|
|
294 |
int ReadDomainKeeperPolicy(struct io_buffer *head) |
/** |
295 |
|
* ccs_transition_type - Get domain transition type. |
296 |
|
* |
297 |
|
* @domainname: The name of domain. |
298 |
|
* @program: The name of program. |
299 |
|
* |
300 |
|
* Returns CCS_TRANSITION_CONTROL_INITIALIZE if executing @program |
301 |
|
* reinitializes domain transition, CCS_TRANSITION_CONTROL_KEEP if executing |
302 |
|
* @program suppresses domain transition, others otherwise. |
303 |
|
* |
304 |
|
* Caller holds ccs_read_lock(). |
305 |
|
*/ |
306 |
|
static u8 ccs_transition_type(const struct ccs_path_info *domainname, |
307 |
|
const struct ccs_path_info *program) |
308 |
{ |
{ |
309 |
struct list1_head *pos; |
const struct ccs_transition_control *ptr; |
310 |
list1_for_each_cookie(pos, head->read_var2, &domain_keeper_list) { |
const char *last_name = ccs_last_word(domainname->name); |
311 |
struct domain_keeper_entry *ptr; |
u8 type; |
312 |
ptr = list1_entry(pos, struct domain_keeper_entry, list); |
for (type = 0; type < CCS_MAX_TRANSITION_TYPE; type++) { |
313 |
if (ptr->is_deleted) continue; |
next: |
314 |
if (ptr->program) { |
list_for_each_entry_rcu(ptr, &ccs_policy_list |
315 |
if (io_printf(head, "%s" KEYWORD_KEEP_DOMAIN "%s from %s\n", ptr->is_not ? "no_" : "", ptr->program->name, ptr->domainname->name)) return -ENOMEM; |
[CCS_ID_TRANSITION_CONTROL], |
316 |
} else { |
head.list) { |
317 |
if (io_printf(head, "%s" KEYWORD_KEEP_DOMAIN "%s\n", ptr->is_not ? "no_" : "", ptr->domainname->name)) return -ENOMEM; |
if (ptr->head.is_deleted || ptr->type != type) |
318 |
|
continue; |
319 |
|
if (ptr->domainname) { |
320 |
|
if (!ptr->is_last_name) { |
321 |
|
if (ptr->domainname != domainname) |
322 |
|
continue; |
323 |
|
} else { |
324 |
|
/* |
325 |
|
* Use direct strcmp() since this is |
326 |
|
* unlikely used. |
327 |
|
*/ |
328 |
|
if (strcmp(ptr->domainname->name, |
329 |
|
last_name)) |
330 |
|
continue; |
331 |
|
} |
332 |
|
} |
333 |
|
if (ptr->program && ccs_pathcmp(ptr->program, program)) |
334 |
|
continue; |
335 |
|
if (type == CCS_TRANSITION_CONTROL_NO_INITIALIZE) { |
336 |
|
/* |
337 |
|
* Do not check for initialize_domain if |
338 |
|
* no_initialize_domain matched. |
339 |
|
*/ |
340 |
|
type = CCS_TRANSITION_CONTROL_NO_KEEP; |
341 |
|
goto next; |
342 |
|
} |
343 |
|
goto done; |
344 |
} |
} |
345 |
} |
} |
346 |
return 0; |
done: |
347 |
|
return type; |
348 |
} |
} |
349 |
|
|
350 |
static bool IsDomainKeeper(const struct path_info *domainname, const struct path_info *program, const struct path_info *last_name) |
static bool ccs_same_aggregator(const struct ccs_acl_head *a, |
351 |
|
const struct ccs_acl_head *b) |
352 |
{ |
{ |
353 |
struct domain_keeper_entry *ptr; |
const struct ccs_aggregator *p1 = container_of(a, typeof(*p1), head); |
354 |
bool flag = 0; |
const struct ccs_aggregator *p2 = container_of(b, typeof(*p2), head); |
355 |
list1_for_each_entry(ptr, &domain_keeper_list, list) { |
return p1->original_name == p2->original_name && |
356 |
if (ptr->is_deleted) continue; |
p1->aggregated_name == p2->aggregated_name; |
|
if (!ptr->is_last_name) { |
|
|
if (ptr->domainname != domainname) continue; |
|
|
} else { |
|
|
if (pathcmp(ptr->domainname, last_name)) continue; |
|
|
} |
|
|
if (ptr->program && pathcmp(ptr->program, program)) continue; |
|
|
if (ptr->is_not) return 0; |
|
|
flag = 1; |
|
|
} |
|
|
return flag; |
|
357 |
} |
} |
358 |
|
|
359 |
/************************* SYMBOLIC LINKED PROGRAM HANDLER *************************/ |
/** |
360 |
|
* ccs_update_aggregator_entry - Update "struct ccs_aggregator" list. |
361 |
static LIST1_HEAD(alias_list); |
* |
362 |
|
* @original_name: The original program's name. |
363 |
static int AddAliasEntry(const char *original_name, const char *aliased_name, const bool is_delete) |
* @aggregated_name: The aggregated program's name. |
364 |
{ |
* @is_delete: True if it is a delete request. |
365 |
struct alias_entry *new_entry, *ptr; |
* |
366 |
static DEFINE_MUTEX(lock); |
* Returns 0 on success, negative value otherwise. |
367 |
const struct path_info *saved_original_name, *saved_aliased_name; |
*/ |
368 |
int error = -ENOMEM; |
static int ccs_update_aggregator_entry(const char *original_name, |
369 |
if (!IsCorrectPath(original_name, 1, -1, -1, __FUNCTION__) || !IsCorrectPath(aliased_name, 1, -1, -1, __FUNCTION__)) return -EINVAL; /* No patterns allowed. */ |
const char *aggregated_name, |
370 |
if ((saved_original_name = SaveName(original_name)) == NULL || (saved_aliased_name = SaveName(aliased_name)) == NULL) return -ENOMEM; |
const bool is_delete) |
371 |
mutex_lock(&lock); |
{ |
372 |
list1_for_each_entry(ptr, &alias_list, list) { |
struct ccs_aggregator e = { }; |
373 |
if (ptr->original_name == saved_original_name && ptr->aliased_name == saved_aliased_name) { |
int error = is_delete ? -ENOENT : -ENOMEM; |
374 |
ptr->is_deleted = is_delete; |
if (!ccs_correct_path(original_name) || |
375 |
error = 0; |
!ccs_correct_path(aggregated_name)) |
376 |
goto out; |
return -EINVAL; |
377 |
} |
e.original_name = ccs_get_name(original_name); |
378 |
} |
e.aggregated_name = ccs_get_name(aggregated_name); |
379 |
if (is_delete) { |
if (!e.original_name || !e.aggregated_name || |
380 |
error = -ENOENT; |
e.aggregated_name->is_patterned) /* No patterns allowed. */ |
381 |
goto out; |
goto out; |
382 |
} |
error = ccs_update_policy(&e.head, sizeof(e), is_delete, |
383 |
if ((new_entry = alloc_element(sizeof(*new_entry))) == NULL) goto out; |
&ccs_policy_list[CCS_ID_AGGREGATOR], |
384 |
new_entry->original_name = saved_original_name; |
ccs_same_aggregator); |
|
new_entry->aliased_name = saved_aliased_name; |
|
|
list1_add_tail_mb(&new_entry->list, &alias_list); |
|
|
error = 0; |
|
385 |
out: |
out: |
386 |
mutex_unlock(&lock); |
ccs_put_name(e.original_name); |
387 |
|
ccs_put_name(e.aggregated_name); |
388 |
return error; |
return error; |
389 |
} |
} |
390 |
|
|
391 |
int ReadAliasPolicy(struct io_buffer *head) |
/** |
392 |
{ |
* ccs_write_aggregator - Write "struct ccs_aggregator" list. |
393 |
struct list1_head *pos; |
* |
394 |
list1_for_each_cookie(pos, head->read_var2, &alias_list) { |
* @data: String to parse. |
395 |
struct alias_entry *ptr; |
* @is_delete: True if it is a delete request. |
396 |
ptr = list1_entry(pos, struct alias_entry, list); |
* |
397 |
if (ptr->is_deleted) continue; |
* Returns 0 on success, negative value otherwise. |
398 |
if (io_printf(head, KEYWORD_ALIAS "%s %s\n", ptr->original_name->name, ptr->aliased_name->name)) return -ENOMEM; |
*/ |
399 |
} |
int ccs_write_aggregator(char *data, const bool is_delete) |
|
return 0; |
|
|
} |
|
|
|
|
|
int AddAliasPolicy(char *data, const bool is_delete) |
|
|
{ |
|
|
char *cp = strchr(data, ' '); |
|
|
if (!cp) return -EINVAL; |
|
|
*cp++ = '\0'; |
|
|
return AddAliasEntry(data, cp, is_delete); |
|
|
} |
|
|
|
|
|
/************************* DOMAIN AGGREGATOR HANDLER *************************/ |
|
|
|
|
|
static LIST1_HEAD(aggregator_list); |
|
|
|
|
|
static int AddAggregatorEntry(const char *original_name, const char *aggregated_name, const bool is_delete) |
|
400 |
{ |
{ |
401 |
struct aggregator_entry *new_entry, *ptr; |
char *w[2]; |
402 |
static DEFINE_MUTEX(lock); |
if (!ccs_tokenize(data, w, sizeof(w)) || !w[1][0]) |
403 |
const struct path_info *saved_original_name, *saved_aggregated_name; |
return -EINVAL; |
404 |
int error = -ENOMEM; |
return ccs_update_aggregator_entry(w[0], w[1], is_delete); |
|
if (!IsCorrectPath(original_name, 1, 0, -1, __FUNCTION__) || !IsCorrectPath(aggregated_name, 1, -1, -1, __FUNCTION__)) return -EINVAL; |
|
|
if ((saved_original_name = SaveName(original_name)) == NULL || (saved_aggregated_name = SaveName(aggregated_name)) == NULL) return -ENOMEM; |
|
|
mutex_lock(&lock); |
|
|
list1_for_each_entry(ptr, &aggregator_list, list) { |
|
|
if (ptr->original_name == saved_original_name && ptr->aggregated_name == saved_aggregated_name) { |
|
|
ptr->is_deleted = is_delete; |
|
|
error = 0; |
|
|
goto out; |
|
|
} |
|
|
} |
|
|
if (is_delete) { |
|
|
error = -ENOENT; |
|
|
goto out; |
|
|
} |
|
|
if ((new_entry = alloc_element(sizeof(*new_entry))) == NULL) goto out; |
|
|
new_entry->original_name = saved_original_name; |
|
|
new_entry->aggregated_name = saved_aggregated_name; |
|
|
list1_add_tail_mb(&new_entry->list, &aggregator_list); |
|
|
error = 0; |
|
|
out: |
|
|
mutex_unlock(&lock); |
|
|
return error; |
|
405 |
} |
} |
406 |
|
|
407 |
int ReadAggregatorPolicy(struct io_buffer *head) |
/* Domain create/delete handler. */ |
|
{ |
|
|
struct list1_head *pos; |
|
|
list1_for_each_cookie(pos, head->read_var2, &aggregator_list) { |
|
|
struct aggregator_entry *ptr; |
|
|
ptr = list1_entry(pos, struct aggregator_entry, list); |
|
|
if (ptr->is_deleted) continue; |
|
|
if (io_printf(head, KEYWORD_AGGREGATOR "%s %s\n", ptr->original_name->name, ptr->aggregated_name->name)) return -ENOMEM; |
|
|
} |
|
|
return 0; |
|
|
} |
|
408 |
|
|
409 |
int AddAggregatorPolicy(char *data, const bool is_delete) |
/** |
410 |
|
* ccs_delete_domain - Delete a domain. |
411 |
|
* |
412 |
|
* @domainname: The name of domain. |
413 |
|
* |
414 |
|
* Returns 0. |
415 |
|
*/ |
416 |
|
int ccs_delete_domain(char *domainname) |
417 |
{ |
{ |
418 |
char *cp = strchr(data, ' '); |
struct ccs_domain_info *domain; |
419 |
if (!cp) return -EINVAL; |
struct ccs_path_info name; |
420 |
*cp++ = '\0'; |
name.name = domainname; |
421 |
return AddAggregatorEntry(data, cp, is_delete); |
ccs_fill_path_info(&name); |
422 |
} |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
423 |
|
return 0; |
|
/************************* DOMAIN DELETION HANDLER *************************/ |
|
|
|
|
|
/* #define DEBUG_DOMAIN_UNDELETE */ |
|
|
|
|
|
int DeleteDomain(char *domainname0) |
|
|
{ |
|
|
struct domain_info *domain; |
|
|
struct path_info domainname; |
|
|
domainname.name = domainname0; |
|
|
fill_path_info(&domainname); |
|
|
mutex_lock(&new_domain_assign_lock); |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
printk("DeleteDomain %s\n", domainname0); |
|
|
list1_for_each_entry(domain, &domain_list, list) { |
|
|
if (pathcmp(domain->domainname, &domainname)) continue; |
|
|
printk("List: %p %u\n", domain, domain->is_deleted); |
|
|
} |
|
|
#endif |
|
424 |
/* Is there an active domain? */ |
/* Is there an active domain? */ |
425 |
list1_for_each_entry(domain, &domain_list, list) { |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
426 |
struct domain_info *domain2; |
/* Never delete ccs_kernel_domain */ |
427 |
/* Never delete KERNEL_DOMAIN */ |
if (domain == &ccs_kernel_domain) |
428 |
if (domain == &KERNEL_DOMAIN || domain->is_deleted || pathcmp(domain->domainname, &domainname)) continue; |
continue; |
429 |
/* Mark already deleted domains as non undeletable. */ |
if (domain->is_deleted || |
430 |
list1_for_each_entry(domain2, &domain_list, list) { |
ccs_pathcmp(domain->domainname, &name)) |
431 |
if (!domain2->is_deleted || pathcmp(domain2->domainname, &domainname)) continue; |
continue; |
432 |
#ifdef DEBUG_DOMAIN_UNDELETE |
domain->is_deleted = true; |
|
if (domain2->is_deleted != 255) printk("Marked %p as non undeletable\n", domain2); |
|
|
#endif |
|
|
domain2->is_deleted = 255; |
|
|
} |
|
|
/* Delete and mark active domain as undeletable. */ |
|
|
domain->is_deleted = 1; |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
printk("Marked %p as undeletable\n", domain); |
|
|
#endif |
|
433 |
break; |
break; |
434 |
} |
} |
435 |
mutex_unlock(&new_domain_assign_lock); |
mutex_unlock(&ccs_policy_lock); |
436 |
return 0; |
return 0; |
437 |
} |
} |
438 |
|
|
439 |
struct domain_info *UndeleteDomain(const char *domainname0) |
/** |
440 |
|
* ccs_assign_domain - Create a domain. |
441 |
|
* |
442 |
|
* @domainname: The name of domain. |
443 |
|
* @profile: Profile number to assign if the domain was newly created. |
444 |
|
* |
445 |
|
* Returns pointer to "struct ccs_domain_info" on success, NULL otherwise. |
446 |
|
*/ |
447 |
|
struct ccs_domain_info *ccs_assign_domain(const char *domainname, |
448 |
|
const u8 profile) |
449 |
{ |
{ |
450 |
struct domain_info *domain, *candidate_domain = NULL; |
struct ccs_domain_info e = { }; |
451 |
struct path_info domainname; |
struct ccs_domain_info *entry = NULL; |
452 |
domainname.name = domainname0; |
bool found = false; |
453 |
fill_path_info(&domainname); |
|
454 |
mutex_lock(&new_domain_assign_lock); |
if (!ccs_correct_domain(domainname)) |
455 |
#ifdef DEBUG_DOMAIN_UNDELETE |
return NULL; |
456 |
printk("UndeleteDomain %s\n", domainname0); |
e.profile = profile; |
457 |
list1_for_each_entry(domain, &domain_list, list) { |
e.domainname = ccs_get_name(domainname); |
458 |
if (pathcmp(domain->domainname, &domainname)) continue; |
if (!e.domainname) |
459 |
printk("List: %p %u\n", domain, domain->is_deleted); |
return NULL; |
460 |
} |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
|
#endif |
|
|
list1_for_each_entry(domain, &domain_list, list) { |
|
|
if (pathcmp(&domainname, domain->domainname)) continue; |
|
|
if (!domain->is_deleted) { |
|
|
/* This domain is active. I can't undelete. */ |
|
|
candidate_domain = NULL; |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
printk("%p is active. I can't undelete.\n", domain); |
|
|
#endif |
|
|
break; |
|
|
} |
|
|
/* Is this domain undeletable? */ |
|
|
if (domain->is_deleted == 1) candidate_domain = domain; |
|
|
} |
|
|
if (candidate_domain) { |
|
|
candidate_domain->is_deleted = 0; |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
printk("%p was undeleted.\n", candidate_domain); |
|
|
#endif |
|
|
} |
|
|
mutex_unlock(&new_domain_assign_lock); |
|
|
return candidate_domain; |
|
|
} |
|
|
|
|
|
/************************* DOMAIN TRANSITION HANDLER *************************/ |
|
|
|
|
|
struct domain_info *FindOrAssignNewDomain(const char *domainname, const u8 profile) |
|
|
{ |
|
|
struct domain_info *domain = NULL; |
|
|
const struct path_info *saved_domainname; |
|
|
mutex_lock(&new_domain_assign_lock); |
|
|
if ((domain = FindDomain(domainname)) != NULL) goto out; |
|
|
if (!IsCorrectDomain(domainname, __FUNCTION__)) goto out; |
|
|
if ((saved_domainname = SaveName(domainname)) == NULL) goto out; |
|
|
/* Can I reuse memory of deleted domain? */ |
|
|
list1_for_each_entry(domain, &domain_list, list) { |
|
|
struct task_struct *p; |
|
|
struct acl_info *ptr; |
|
|
int flag; |
|
|
if (!domain->is_deleted || domain->domainname != saved_domainname) continue; |
|
|
flag = 0; |
|
|
/***** CRITICAL SECTION START *****/ |
|
|
read_lock(&tasklist_lock); |
|
|
for_each_process(p) { |
|
|
if (p->domain_info == domain) { flag = 1; break; } |
|
|
} |
|
|
read_unlock(&tasklist_lock); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
if (flag) continue; |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
printk("Reusing %p %s\n", domain, domain->domainname->name); |
|
|
#endif |
|
|
list1_for_each_entry(ptr, &domain->acl_info_list, list) ptr->is_deleted = 1; |
|
|
domain->profile = profile; |
|
|
domain->quota_warned = 0; |
|
|
mb(); /* Avoid out-of-order execution. */ |
|
|
domain->is_deleted = 0; |
|
461 |
goto out; |
goto out; |
462 |
|
list_for_each_entry_rcu(entry, &ccs_domain_list, list) { |
463 |
|
if (entry->is_deleted || |
464 |
|
ccs_pathcmp(e.domainname, entry->domainname)) |
465 |
|
continue; |
466 |
|
found = true; |
467 |
|
break; |
468 |
} |
} |
469 |
/* No memory reusable. Create using new memory. */ |
if (!found) { |
470 |
if ((domain = alloc_element(sizeof(*domain))) != NULL) { |
entry = ccs_commit_ok(&e, sizeof(e)); |
471 |
INIT_LIST1_HEAD(&domain->acl_info_list); |
if (entry) { |
472 |
domain->domainname = saved_domainname; |
INIT_LIST_HEAD(&entry->acl_info_list); |
473 |
domain->profile = profile; |
list_add_tail_rcu(&entry->list, &ccs_domain_list); |
474 |
list1_add_tail_mb(&domain->list, &domain_list); |
found = true; |
|
} |
|
|
out: ; |
|
|
mutex_unlock(&new_domain_assign_lock); |
|
|
return domain; |
|
|
} |
|
|
|
|
|
static int Escape(char *dest, const char *src, int dest_len) |
|
|
{ |
|
|
while (*src) { |
|
|
const unsigned char c = * (const unsigned char *) src; |
|
|
if (c == '\\') { |
|
|
dest_len -= 2; |
|
|
if (dest_len <= 0) goto out; |
|
|
*dest++ = '\\'; |
|
|
*dest++ = '\\'; |
|
|
} else if (c > ' ' && c < 127) { |
|
|
if (--dest_len <= 0) goto out; |
|
|
*dest++ = c; |
|
|
} else { |
|
|
dest_len -= 4; |
|
|
if (dest_len <= 0) goto out; |
|
|
*dest++ = '\\'; |
|
|
*dest++ = (c >> 6) + '0'; |
|
|
*dest++ = ((c >> 3) & 7) + '0'; |
|
|
*dest++ = (c & 7) + '0'; |
|
475 |
} |
} |
|
src++; |
|
476 |
} |
} |
477 |
if (--dest_len <= 0) goto out; |
mutex_unlock(&ccs_policy_lock); |
|
*dest = '\0'; |
|
|
return 0; |
|
478 |
out: |
out: |
479 |
return -ENOMEM; |
ccs_put_name(e.domainname); |
480 |
|
return found ? entry : NULL; |
481 |
} |
} |
482 |
|
|
483 |
static char *get_argv0(struct linux_binprm *bprm) |
/** |
484 |
|
* ccs_find_next_domain - Find a domain. |
485 |
|
* |
486 |
|
* @ee: Pointer to "struct ccs_execve". |
487 |
|
* |
488 |
|
* Returns 0 on success, negative value otherwise. |
489 |
|
* |
490 |
|
* Caller holds ccs_read_lock(). |
491 |
|
*/ |
492 |
|
static int ccs_find_next_domain(struct ccs_execve *ee) |
493 |
{ |
{ |
494 |
char *arg_ptr = ccs_alloc(PAGE_SIZE); /* Initial buffer. */ |
struct ccs_request_info *r = &ee->r; |
495 |
int arg_len = 0; |
const struct ccs_path_info *handler = ee->handler; |
496 |
unsigned long pos = bprm->p; |
struct ccs_domain_info *domain = NULL; |
497 |
int i = pos / PAGE_SIZE, offset = pos % PAGE_SIZE; |
struct ccs_domain_info * const old_domain = ccs_current_domain(); |
498 |
if (!bprm->argc || !arg_ptr) goto out; |
struct linux_binprm *bprm = ee->bprm; |
499 |
while (1) { |
struct task_struct *task = current; |
500 |
struct page *page; |
const u32 ccs_flags = task->ccs_flags; |
501 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23) && defined(CONFIG_MMU) |
struct ccs_path_info rn = { }; /* real name */ |
|
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) goto out; |
|
|
#else |
|
|
page = bprm->page[i]; |
|
|
#endif |
|
|
{ /* Map and copy to kernel buffer and unmap. */ |
|
|
const char *kaddr = kmap(page); |
|
|
if (!kaddr) { /* Mapping failed. */ |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23) && defined(CONFIG_MMU) |
|
|
put_page(page); |
|
|
#endif |
|
|
goto out; |
|
|
} |
|
|
memmove(arg_ptr + arg_len, kaddr + offset, PAGE_SIZE - offset); |
|
|
kunmap(page); |
|
|
} |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23) && defined(CONFIG_MMU) |
|
|
put_page(page); |
|
|
pos += PAGE_SIZE - offset; |
|
|
#endif |
|
|
arg_len += PAGE_SIZE - offset; |
|
|
if (memchr(arg_ptr, '\0', arg_len)) break; |
|
|
{ /* Initial buffer was too small for argv[0]. Retry after expanding buffer. */ |
|
|
char *tmp_arg_ptr = ccs_alloc(arg_len + PAGE_SIZE); |
|
|
if (!tmp_arg_ptr) goto out; |
|
|
memmove(tmp_arg_ptr, arg_ptr, arg_len); |
|
|
ccs_free(arg_ptr); |
|
|
arg_ptr = tmp_arg_ptr; |
|
|
} |
|
|
i++; |
|
|
offset = 0; |
|
|
} |
|
|
return arg_ptr; |
|
|
out: /* Release initial buffer. */ |
|
|
ccs_free(arg_ptr); |
|
|
return NULL; |
|
|
} |
|
|
|
|
|
static int FindNextDomain(struct linux_binprm *bprm, struct domain_info **next_domain, const u8 do_perm_check) |
|
|
{ |
|
|
/* This function assumes that the size of buffer returned by realpath() = CCS_MAX_PATHNAME_LEN. */ |
|
|
struct domain_info *old_domain = current->domain_info, *domain = NULL; |
|
|
const char *old_domain_name = old_domain->domainname->name; |
|
|
const char *original_name = bprm->filename; |
|
|
struct file *filp = bprm->file; |
|
|
char *new_domain_name = NULL; |
|
|
char *real_program_name = NULL, *symlink_program_name = NULL; |
|
|
const bool is_enforce = (CheckCCSFlags(CCS_TOMOYO_MAC_FOR_FILE) == 3); |
|
502 |
int retval; |
int retval; |
503 |
struct path_info r, s, l; |
bool need_kfree = false; |
504 |
|
bool domain_created = false; |
505 |
{ |
retry: |
506 |
/* |
current->ccs_flags = ccs_flags; |
507 |
* Built-in initializers. This is needed because policies are not loaded until starting /sbin/init . |
r->cond = NULL; |
508 |
*/ |
if (need_kfree) { |
509 |
static int first = 1; |
kfree(rn.name); |
510 |
if (first) { |
need_kfree = false; |
|
AddDomainInitializerEntry(NULL, "/sbin/hotplug", 0, 0); |
|
|
AddDomainInitializerEntry(NULL, "/sbin/modprobe", 0, 0); |
|
|
first = 0; |
|
|
} |
|
511 |
} |
} |
512 |
|
|
513 |
/* Get realpath of program. */ |
/* Get symlink's pathname of program. */ |
514 |
retval = -ENOENT; /* I hope realpath() won't fail with -ENOMEM. */ |
retval = ccs_symlink_path(bprm->filename, &rn); |
515 |
if ((real_program_name = realpath(original_name)) == NULL) goto out; |
if (retval < 0) |
516 |
/* Get realpath of symbolic link. */ |
goto out; |
517 |
if ((symlink_program_name = realpath_nofollow(original_name)) == NULL) goto out; |
need_kfree = true; |
518 |
|
|
519 |
r.name = real_program_name; |
if (handler) { |
520 |
fill_path_info(&r); |
if (ccs_pathcmp(&rn, handler)) { |
521 |
s.name = symlink_program_name; |
/* Failed to verify execute handler. */ |
522 |
fill_path_info(&s); |
static u8 counter = 20; |
523 |
if ((l.name = strrchr(old_domain_name, ' ')) != NULL) l.name++; |
if (counter) { |
524 |
else l.name = old_domain_name; |
counter--; |
525 |
fill_path_info(&l); |
printk(KERN_WARNING "Failed to verify: %s\n", |
526 |
|
handler->name); |
|
if (!do_perm_check) goto ok; |
|
|
|
|
|
/* Check 'alias' directive. */ |
|
|
if (pathcmp(&r, &s)) { |
|
|
struct alias_entry *ptr; |
|
|
/* Is this program allowed to be called via symbolic links? */ |
|
|
list1_for_each_entry(ptr, &alias_list, list) { |
|
|
if (ptr->is_deleted || pathcmp(&r, ptr->original_name) || pathcmp(&s, ptr->aliased_name)) continue; |
|
|
memset(real_program_name, 0, CCS_MAX_PATHNAME_LEN); |
|
|
strncpy(real_program_name, ptr->aliased_name->name, CCS_MAX_PATHNAME_LEN - 1); |
|
|
fill_path_info(&r); |
|
|
break; |
|
|
} |
|
|
} |
|
|
|
|
|
/* Compare basename of real_program_name and argv[0] */ |
|
|
if (bprm->argc > 0 && CheckCCSFlags(CCS_TOMOYO_MAC_FOR_ARGV0)) { |
|
|
char *org_argv0 = get_argv0(bprm); |
|
|
retval = -ENOMEM; |
|
|
if (org_argv0) { |
|
|
const int len = strlen(org_argv0); |
|
|
char *printable_argv0 = ccs_alloc(len * 4 + 8); |
|
|
if (printable_argv0 && Escape(printable_argv0, org_argv0, len * 4 + 8) == 0) { |
|
|
const char *base_argv0, *base_filename; |
|
|
if ((base_argv0 = strrchr(printable_argv0, '/')) == NULL) base_argv0 = printable_argv0; else base_argv0++; |
|
|
if ((base_filename = strrchr(real_program_name, '/')) == NULL) base_filename = real_program_name; else base_filename++; |
|
|
if (strcmp(base_argv0, base_filename)) retval = CheckArgv0Perm(&r, base_argv0); |
|
|
else retval = 0; |
|
527 |
} |
} |
528 |
ccs_free(printable_argv0); |
goto out; |
|
ccs_free(org_argv0); |
|
529 |
} |
} |
530 |
if (retval) goto out; |
} else { |
531 |
} |
struct ccs_aggregator *ptr; |
532 |
|
/* Check 'aggregator' directive. */ |
533 |
/* Check 'aggregator' directive. */ |
list_for_each_entry_rcu(ptr, |
534 |
{ |
&ccs_policy_list[CCS_ID_AGGREGATOR], |
535 |
struct aggregator_entry *ptr; |
head.list) { |
536 |
/* Is this program allowed to be aggregated? */ |
if (ptr->head.is_deleted || |
537 |
list1_for_each_entry(ptr, &aggregator_list, list) { |
!ccs_path_matches_pattern(&rn, ptr->original_name)) |
538 |
if (ptr->is_deleted || !PathMatchesToPattern(&r, ptr->original_name)) continue; |
continue; |
539 |
memset(real_program_name, 0, CCS_MAX_PATHNAME_LEN); |
kfree(rn.name); |
540 |
strncpy(real_program_name, ptr->aggregated_name->name, CCS_MAX_PATHNAME_LEN - 1); |
need_kfree = false; |
541 |
fill_path_info(&r); |
/* This is OK because it is read only. */ |
542 |
|
rn = *ptr->aggregated_name; |
543 |
break; |
break; |
544 |
} |
} |
|
} |
|
545 |
|
|
546 |
/* Check execute permission. */ |
/* Check execute permission. */ |
547 |
if ((retval = CheckExecPerm(&r, filp)) < 0) goto out; |
retval = ccs_path_permission(r, CCS_TYPE_EXECUTE, &rn); |
548 |
|
if (retval == CCS_RETRY_REQUEST) |
549 |
|
goto retry; |
550 |
|
if (retval < 0) |
551 |
|
goto out; |
552 |
|
} |
553 |
|
|
554 |
ok: ; |
/* Calculate domain to transit to. */ |
555 |
/* Allocate memory for calcurating domain name. */ |
switch (ccs_transition_type(old_domain->domainname, &rn)) { |
556 |
retval = -ENOMEM; |
case CCS_TRANSITION_CONTROL_INITIALIZE: |
557 |
if ((new_domain_name = ccs_alloc(CCS_MAX_PATHNAME_LEN + 16)) == NULL) goto out; |
/* Transit to the child of ccs_kernel_domain domain. */ |
558 |
|
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, CCS_ROOT_NAME " " "%s", |
559 |
if (IsDomainInitializer(old_domain->domainname, &r, &l)) { |
rn.name); |
560 |
/* Transit to the child of KERNEL_DOMAIN domain. */ |
break; |
561 |
snprintf(new_domain_name, CCS_MAX_PATHNAME_LEN + 1, ROOT_NAME " " "%s", real_program_name); |
case CCS_TRANSITION_CONTROL_KEEP: |
|
} else if (old_domain == &KERNEL_DOMAIN && !sbin_init_started) { |
|
|
/* |
|
|
* Needn't to transit from kernel domain before starting /sbin/init . |
|
|
* But transit from kernel domain if executing initializers, for they might start before /sbin/init . |
|
|
*/ |
|
|
domain = old_domain; |
|
|
} else if (IsDomainKeeper(old_domain->domainname, &r, &l)) { |
|
562 |
/* Keep current domain. */ |
/* Keep current domain. */ |
563 |
domain = old_domain; |
domain = old_domain; |
564 |
} else { |
break; |
565 |
/* Normal domain transition. */ |
default: |
566 |
snprintf(new_domain_name, CCS_MAX_PATHNAME_LEN + 1, "%s %s", old_domain_name, real_program_name); |
if (old_domain == &ccs_kernel_domain && !ccs_policy_loaded) { |
567 |
} |
/* |
568 |
if (!domain && strlen(new_domain_name) < CCS_MAX_PATHNAME_LEN) { |
* Needn't to transit from kernel domain before |
569 |
if (is_enforce) { |
* starting /sbin/init. But transit from kernel domain |
570 |
domain = FindDomain(new_domain_name); |
* if executing initializers because they might start |
571 |
if (!domain) if (CheckSupervisor("#Need to create domain\n%s\n", new_domain_name) == 0) domain = FindOrAssignNewDomain(new_domain_name, current->domain_info->profile); |
* before /sbin/init. |
572 |
|
*/ |
573 |
|
domain = old_domain; |
574 |
} else { |
} else { |
575 |
domain = FindOrAssignNewDomain(new_domain_name, current->domain_info->profile); |
/* Normal domain transition. */ |
576 |
|
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s %s", |
577 |
|
old_domain->domainname->name, rn.name); |
578 |
} |
} |
579 |
|
break; |
580 |
} |
} |
581 |
|
if (domain || strlen(ee->tmp) >= CCS_EXEC_TMPSIZE - 10) |
582 |
|
goto done; |
583 |
|
domain = ccs_find_domain(ee->tmp); |
584 |
|
if (domain) |
585 |
|
goto done; |
586 |
|
if (r->mode == CCS_CONFIG_ENFORCING) { |
587 |
|
int error = ccs_supervisor(r, "# wants to create domain\n" |
588 |
|
"%s\n", ee->tmp); |
589 |
|
if (error == CCS_RETRY_REQUEST) |
590 |
|
goto retry; |
591 |
|
if (error < 0) |
592 |
|
goto done; |
593 |
|
} |
594 |
|
domain = ccs_assign_domain(ee->tmp, r->profile); |
595 |
|
if (domain) |
596 |
|
domain_created = true; |
597 |
|
done: |
598 |
if (!domain) { |
if (!domain) { |
599 |
printk("TOMOYO-ERROR: Domain '%s' not defined.\n", new_domain_name); |
retval = (r->mode == CCS_CONFIG_ENFORCING) ? -EPERM : 0; |
600 |
if (is_enforce) retval = -EPERM; |
if (!old_domain->flags[CCS_DIF_TRANSITION_FAILED]) { |
601 |
|
old_domain->flags[CCS_DIF_TRANSITION_FAILED] = true; |
602 |
|
r->granted = false; |
603 |
|
ccs_write_log(r, CCS_KEYWORD_TRANSITION_FAILED "\n"); |
604 |
|
printk(KERN_WARNING |
605 |
|
"ERROR: Domain '%s' not defined.\n", ee->tmp); |
606 |
|
} |
607 |
} else { |
} else { |
608 |
retval = 0; |
retval = 0; |
609 |
} |
} |
610 |
out: ; |
if (!retval && handler) |
611 |
ccs_free(new_domain_name); |
ccs_audit_execute_handler_log(ee); |
612 |
ccs_free(real_program_name); |
/* |
613 |
ccs_free(symlink_program_name); |
* Tell GC that I started execve(). |
614 |
*next_domain = domain ? domain : old_domain; |
* Also, tell open_exec() to check read permission. |
615 |
|
*/ |
616 |
|
task->ccs_flags |= CCS_TASK_IS_IN_EXECVE; |
617 |
|
/* |
618 |
|
* Make task->ccs_flags visible to GC before changing |
619 |
|
* task->ccs_domain_info . |
620 |
|
*/ |
621 |
|
smp_mb(); |
622 |
|
/* |
623 |
|
* Proceed to the next domain in order to allow reaching via PID. |
624 |
|
* It will be reverted if execve() failed. Reverting is not good. |
625 |
|
* But it is better than being unable to reach via PID in interactive |
626 |
|
* enforcing mode. |
627 |
|
*/ |
628 |
|
if (domain) |
629 |
|
task->ccs_domain_info = domain; |
630 |
|
if (domain_created) |
631 |
|
ccs_audit_domain_creation_log(); |
632 |
|
out: |
633 |
|
if (need_kfree) |
634 |
|
kfree(rn.name); |
635 |
return retval; |
return retval; |
636 |
} |
} |
637 |
|
|
638 |
static int CheckEnviron(struct linux_binprm *bprm) |
/** |
639 |
|
* ccs_environ - Check permission for environment variable names. |
640 |
|
* |
641 |
|
* @ee: Pointer to "struct ccs_execve". |
642 |
|
* |
643 |
|
* Returns 0 on success, negative value otherwise. |
644 |
|
*/ |
645 |
|
static int ccs_environ(struct ccs_execve *ee) |
646 |
{ |
{ |
647 |
const u8 profile = current->domain_info->profile; |
struct ccs_request_info *r = &ee->r; |
648 |
const u8 mode = CheckCCSFlags(CCS_TOMOYO_MAC_FOR_ENV); |
struct linux_binprm *bprm = ee->bprm; |
649 |
char *arg_ptr; |
/* env_page->data is allocated by ccs_dump_page(). */ |
650 |
|
struct ccs_page_dump env_page = { }; |
651 |
|
char *arg_ptr; /* Size is CCS_EXEC_TMPSIZE bytes */ |
652 |
int arg_len = 0; |
int arg_len = 0; |
653 |
unsigned long pos = bprm->p; |
unsigned long pos = bprm->p; |
654 |
int i = pos / PAGE_SIZE, offset = pos % PAGE_SIZE; |
int offset = pos % PAGE_SIZE; |
655 |
int argv_count = bprm->argc; |
int argv_count = bprm->argc; |
656 |
int envp_count = bprm->envc; |
int envp_count = bprm->envc; |
657 |
//printk("start %d %d\n", argv_count, envp_count); |
/* printk(KERN_DEBUG "start %d %d\n", argv_count, envp_count); */ |
658 |
int error = -ENOMEM; |
int error = -ENOMEM; |
659 |
if (!mode || !envp_count) return 0; |
ee->r.type = CCS_MAC_ENVIRON; |
660 |
arg_ptr = ccs_alloc(CCS_MAX_PATHNAME_LEN); |
ee->r.mode = ccs_get_mode(ccs_current_domain()->profile, |
661 |
if (!arg_ptr) goto out; |
CCS_MAC_ENVIRON); |
662 |
|
if (!r->mode || !envp_count) |
663 |
|
return 0; |
664 |
|
arg_ptr = kzalloc(CCS_EXEC_TMPSIZE, CCS_GFP_FLAGS); |
665 |
|
if (!arg_ptr) |
666 |
|
goto out; |
667 |
while (error == -ENOMEM) { |
while (error == -ENOMEM) { |
668 |
struct page *page; |
if (!ccs_dump_page(bprm, pos, &env_page)) |
|
const char *kaddr; |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23) && defined(CONFIG_MMU) |
|
|
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) goto out; |
|
|
#else |
|
|
page = bprm->page[i]; |
|
|
#endif |
|
|
/* Map */ |
|
|
kaddr = kmap(page); |
|
|
if (!kaddr) { /* Mapping failed. */ |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23) && defined(CONFIG_MMU) |
|
|
put_page(page); |
|
|
#endif |
|
669 |
goto out; |
goto out; |
670 |
} |
pos += PAGE_SIZE - offset; |
671 |
/* Read. */ |
/* Read. */ |
672 |
while (argv_count && offset < PAGE_SIZE) { |
while (argv_count && offset < PAGE_SIZE) { |
673 |
if (!kaddr[offset++]) argv_count--; |
if (!env_page.data[offset++]) |
674 |
|
argv_count--; |
675 |
|
} |
676 |
|
if (argv_count) { |
677 |
|
offset = 0; |
678 |
|
continue; |
679 |
} |
} |
|
if (argv_count) goto unmap_page; |
|
680 |
while (offset < PAGE_SIZE) { |
while (offset < PAGE_SIZE) { |
681 |
const unsigned char c = kaddr[offset++]; |
const unsigned char c = env_page.data[offset++]; |
682 |
if (c && arg_len < CCS_MAX_PATHNAME_LEN - 10) { |
if (c && arg_len < CCS_EXEC_TMPSIZE - 10) { |
683 |
if (c == '=') { |
if (c == '=') { |
684 |
arg_ptr[arg_len++] = '\0'; |
arg_ptr[arg_len++] = '\0'; |
685 |
} else if (c == '\\') { |
} else if (c == '\\') { |
690 |
} else { |
} else { |
691 |
arg_ptr[arg_len++] = '\\'; |
arg_ptr[arg_len++] = '\\'; |
692 |
arg_ptr[arg_len++] = (c >> 6) + '0'; |
arg_ptr[arg_len++] = (c >> 6) + '0'; |
693 |
arg_ptr[arg_len++] = ((c >> 3) & 7) + '0'; |
arg_ptr[arg_len++] |
694 |
|
= ((c >> 3) & 7) + '0'; |
695 |
arg_ptr[arg_len++] = (c & 7) + '0'; |
arg_ptr[arg_len++] = (c & 7) + '0'; |
696 |
} |
} |
697 |
} else { |
} else { |
698 |
arg_ptr[arg_len] = '\0'; |
arg_ptr[arg_len] = '\0'; |
699 |
} |
} |
700 |
if (c) continue; |
if (c) |
701 |
if (CheckEnvPerm(arg_ptr, profile, mode)) { |
continue; |
702 |
|
if (ccs_env_perm(r, arg_ptr)) { |
703 |
error = -EPERM; |
error = -EPERM; |
704 |
break; |
break; |
705 |
} |
} |
709 |
} |
} |
710 |
arg_len = 0; |
arg_len = 0; |
711 |
} |
} |
|
unmap_page: |
|
|
/* Unmap. */ |
|
|
kunmap(page); |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23) && defined(CONFIG_MMU) |
|
|
put_page(page); |
|
|
pos += PAGE_SIZE - offset; |
|
|
#endif |
|
|
i++; |
|
712 |
offset = 0; |
offset = 0; |
713 |
} |
} |
714 |
out: |
out: |
715 |
ccs_free(arg_ptr); |
if (r->mode != 3) |
716 |
if (error && mode != 3) error = 0; |
error = 0; |
717 |
|
kfree(env_page.data); |
718 |
|
kfree(arg_ptr); |
719 |
return error; |
return error; |
720 |
} |
} |
721 |
|
|
722 |
static void UnEscape(unsigned char *dest) |
/** |
723 |
|
* ccs_unescape - Unescape escaped string. |
724 |
|
* |
725 |
|
* @dest: String to unescape. |
726 |
|
* |
727 |
|
* Returns nothing. |
728 |
|
*/ |
729 |
|
static void ccs_unescape(unsigned char *dest) |
730 |
{ |
{ |
731 |
unsigned char *src = dest; |
unsigned char *src = dest; |
732 |
unsigned char c, d, e; |
unsigned char c; |
733 |
while ((c = *src++) != '\0') { |
unsigned char d; |
734 |
|
unsigned char e; |
735 |
|
while (1) { |
736 |
|
c = *src++; |
737 |
|
if (!c) |
738 |
|
break; |
739 |
if (c != '\\') { |
if (c != '\\') { |
740 |
*dest++ = c; |
*dest++ = c; |
741 |
continue; |
continue; |
743 |
c = *src++; |
c = *src++; |
744 |
if (c == '\\') { |
if (c == '\\') { |
745 |
*dest++ = c; |
*dest++ = c; |
746 |
} else if (c >= '0' && c <= '3' && |
continue; |
|
(d = *src++) >= '0' && d <= '7' && |
|
|
(e = *src++) >= '0' && e <= '7') { |
|
|
*dest++ = ((c - '0') << 6) | ((d - '0') << 3) | (e - '0'); |
|
|
} else { |
|
|
break; |
|
747 |
} |
} |
748 |
|
if (c < '0' || c > '3') |
749 |
|
break; |
750 |
|
d = *src++; |
751 |
|
if (d < '0' || d > '7') |
752 |
|
break; |
753 |
|
e = *src++; |
754 |
|
if (e < '0' || e > '7') |
755 |
|
break; |
756 |
|
*dest++ = ((c - '0') << 6) + ((d - '0') << 3) + (e - '0'); |
757 |
} |
} |
758 |
*dest = '\0'; |
*dest = '\0'; |
759 |
} |
} |
760 |
|
|
761 |
static int try_alt_exec(struct linux_binprm *bprm, char **alt_exec0) |
/** |
762 |
|
* ccs_root_depth - Get number of directories to strip. |
763 |
|
* |
764 |
|
* @dentry: Pointer to "struct dentry". |
765 |
|
* @vfsmnt: Pointer to "struct vfsmount". |
766 |
|
* |
767 |
|
* Returns number of directories to strip. |
768 |
|
*/ |
769 |
|
static int ccs_root_depth(struct dentry *dentry, struct vfsmount *vfsmnt) |
770 |
{ |
{ |
771 |
|
int depth = 0; |
772 |
|
ccs_realpath_lock(); |
773 |
|
for (;;) { |
774 |
|
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) { |
775 |
|
/* Global root? */ |
776 |
|
if (vfsmnt->mnt_parent == vfsmnt) |
777 |
|
break; |
778 |
|
dentry = vfsmnt->mnt_mountpoint; |
779 |
|
vfsmnt = vfsmnt->mnt_parent; |
780 |
|
continue; |
781 |
|
} |
782 |
|
dentry = dentry->d_parent; |
783 |
|
depth++; |
784 |
|
} |
785 |
|
ccs_realpath_unlock(); |
786 |
|
return depth; |
787 |
|
} |
788 |
|
|
789 |
|
/** |
790 |
|
* ccs_get_root_depth - return the depth of root directory. |
791 |
|
* |
792 |
|
* Returns number of directories to strip. |
793 |
|
*/ |
794 |
|
static int ccs_get_root_depth(void) |
795 |
|
{ |
796 |
|
int depth; |
797 |
|
struct dentry *dentry; |
798 |
|
struct vfsmount *vfsmnt; |
799 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
800 |
|
struct path root; |
801 |
|
#endif |
802 |
|
read_lock(¤t->fs->lock); |
803 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
804 |
|
root = current->fs->root; |
805 |
|
path_get(¤t->fs->root); |
806 |
|
dentry = root.dentry; |
807 |
|
vfsmnt = root.mnt; |
808 |
|
#else |
809 |
|
dentry = dget(current->fs->root); |
810 |
|
vfsmnt = mntget(current->fs->rootmnt); |
811 |
|
#endif |
812 |
|
read_unlock(¤t->fs->lock); |
813 |
|
depth = ccs_root_depth(dentry, vfsmnt); |
814 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
815 |
|
path_put(&root); |
816 |
|
#else |
817 |
|
dput(dentry); |
818 |
|
mntput(vfsmnt); |
819 |
|
#endif |
820 |
|
return depth; |
821 |
|
} |
822 |
|
|
823 |
|
/** |
824 |
|
* ccs_try_alt_exec - Try to start execute handler. |
825 |
|
* |
826 |
|
* @ee: Pointer to "struct ccs_execve". |
827 |
|
* |
828 |
|
* Returns 0 on success, negative value otherwise. |
829 |
|
*/ |
830 |
|
static int ccs_try_alt_exec(struct ccs_execve *ee) |
831 |
|
{ |
832 |
|
/* |
833 |
|
* Contents of modified bprm. |
834 |
|
* The envp[] in original bprm is moved to argv[] so that |
835 |
|
* the alternatively executed program won't be affected by |
836 |
|
* some dangerous environment variables like LD_PRELOAD. |
837 |
|
* |
838 |
|
* modified bprm->argc |
839 |
|
* = original bprm->argc + original bprm->envc + 7 |
840 |
|
* modified bprm->envc |
841 |
|
* = 0 |
842 |
|
* |
843 |
|
* modified bprm->argv[0] |
844 |
|
* = the program's name specified by execute_handler |
845 |
|
* modified bprm->argv[1] |
846 |
|
* = ccs_current_domain()->domainname->name |
847 |
|
* modified bprm->argv[2] |
848 |
|
* = the current process's name |
849 |
|
* modified bprm->argv[3] |
850 |
|
* = the current process's information (e.g. uid/gid). |
851 |
|
* modified bprm->argv[4] |
852 |
|
* = original bprm->filename |
853 |
|
* modified bprm->argv[5] |
854 |
|
* = original bprm->argc in string expression |
855 |
|
* modified bprm->argv[6] |
856 |
|
* = original bprm->envc in string expression |
857 |
|
* modified bprm->argv[7] |
858 |
|
* = original bprm->argv[0] |
859 |
|
* ... |
860 |
|
* modified bprm->argv[bprm->argc + 6] |
861 |
|
* = original bprm->argv[bprm->argc - 1] |
862 |
|
* modified bprm->argv[bprm->argc + 7] |
863 |
|
* = original bprm->envp[0] |
864 |
|
* ... |
865 |
|
* modified bprm->argv[bprm->envc + bprm->argc + 6] |
866 |
|
* = original bprm->envp[bprm->envc - 1] |
867 |
|
*/ |
868 |
|
struct linux_binprm *bprm = ee->bprm; |
869 |
struct file *filp; |
struct file *filp; |
870 |
int retval; |
int retval; |
871 |
/* domainname must not be modified. */ |
const int original_argc = bprm->argc; |
872 |
char *domainname = (char *) current->domain_info->domainname->name; |
const int original_envc = bprm->envc; |
873 |
char *alt_exec; |
struct task_struct *task = current; |
874 |
const char *alt_exec1 = GetAltExec(); |
|
875 |
if (!alt_exec1 || *alt_exec1 != '/') return -EINVAL; |
/* Close the requested program's dentry. */ |
876 |
retval = strlen(alt_exec1) + 1; |
ee->obj.path1.dentry = NULL; |
877 |
*alt_exec0 = alt_exec = ccs_alloc(retval); |
ee->obj.path1.mnt = NULL; |
878 |
if (!alt_exec) return -ENOMEM; |
ee->obj.validate_done = false; |
|
memmove(alt_exec, alt_exec1, retval); |
|
|
UnEscape(alt_exec); |
|
879 |
allow_write_access(bprm->file); |
allow_write_access(bprm->file); |
880 |
fput(bprm->file); |
fput(bprm->file); |
881 |
bprm->file = NULL; |
bprm->file = NULL; |
882 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23) |
|
883 |
retval = remove_arg_zero(bprm); |
/* Invalidate page dump cache. */ |
884 |
if (retval) return retval; |
ee->dump.page = NULL; |
885 |
#else |
|
886 |
remove_arg_zero(bprm); |
/* Move envp[] to argv[] */ |
887 |
|
bprm->argc += bprm->envc; |
888 |
|
bprm->envc = 0; |
889 |
|
|
890 |
|
/* Set argv[6] */ |
891 |
|
{ |
892 |
|
char *cp = ee->tmp; |
893 |
|
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_envc); |
894 |
|
retval = copy_strings_kernel(1, &cp, bprm); |
895 |
|
if (retval < 0) |
896 |
|
goto out; |
897 |
|
bprm->argc++; |
898 |
|
} |
899 |
|
|
900 |
|
/* Set argv[5] */ |
901 |
|
{ |
902 |
|
char *cp = ee->tmp; |
903 |
|
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_argc); |
904 |
|
retval = copy_strings_kernel(1, &cp, bprm); |
905 |
|
if (retval < 0) |
906 |
|
goto out; |
907 |
|
bprm->argc++; |
908 |
|
} |
909 |
|
|
910 |
|
/* Set argv[4] */ |
911 |
|
{ |
912 |
|
retval = copy_strings_kernel(1, &bprm->filename, bprm); |
913 |
|
if (retval < 0) |
914 |
|
goto out; |
915 |
|
bprm->argc++; |
916 |
|
} |
917 |
|
|
918 |
|
/* Set argv[3] */ |
919 |
|
{ |
920 |
|
char *cp = ee->tmp; |
921 |
|
const u32 ccs_flags = task->ccs_flags; |
922 |
|
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, |
923 |
|
"pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " |
924 |
|
"sgid=%d fsuid=%d fsgid=%d state[0]=%u " |
925 |
|
"state[1]=%u state[2]=%u", |
926 |
|
(pid_t) ccsecurity_exports.sys_getpid(), |
927 |
|
current_uid(), current_gid(), current_euid(), |
928 |
|
current_egid(), current_suid(), current_sgid(), |
929 |
|
current_fsuid(), current_fsgid(), |
930 |
|
(u8) (ccs_flags >> 24), (u8) (ccs_flags >> 16), |
931 |
|
(u8) (ccs_flags >> 8)); |
932 |
|
retval = copy_strings_kernel(1, &cp, bprm); |
933 |
|
if (retval < 0) |
934 |
|
goto out; |
935 |
|
bprm->argc++; |
936 |
|
} |
937 |
|
|
938 |
|
/* Set argv[2] */ |
939 |
|
{ |
940 |
|
char *exe = (char *) ccs_get_exe(); |
941 |
|
if (exe) { |
942 |
|
retval = copy_strings_kernel(1, &exe, bprm); |
943 |
|
kfree(exe); |
944 |
|
} else { |
945 |
|
exe = ee->tmp; |
946 |
|
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "<unknown>"); |
947 |
|
retval = copy_strings_kernel(1, &exe, bprm); |
948 |
|
} |
949 |
|
if (retval < 0) |
950 |
|
goto out; |
951 |
|
bprm->argc++; |
952 |
|
} |
953 |
|
|
954 |
|
/* Set argv[1] */ |
955 |
|
{ |
956 |
|
char *cp = ee->tmp; |
957 |
|
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s", |
958 |
|
ccs_current_domain()->domainname->name); |
959 |
|
retval = copy_strings_kernel(1, &cp, bprm); |
960 |
|
if (retval < 0) |
961 |
|
goto out; |
962 |
|
bprm->argc++; |
963 |
|
} |
964 |
|
|
965 |
|
/* Set argv[0] */ |
966 |
|
{ |
967 |
|
int depth = ccs_get_root_depth(); |
968 |
|
int len = ee->handler->total_len + 1; |
969 |
|
char *cp = kmalloc(len, CCS_GFP_FLAGS); |
970 |
|
if (!cp) { |
971 |
|
retval = -ENOMEM; |
972 |
|
goto out; |
973 |
|
} |
974 |
|
ee->handler_path = cp; |
975 |
|
memmove(cp, ee->handler->name, len); |
976 |
|
ccs_unescape(cp); |
977 |
|
retval = -ENOENT; |
978 |
|
if (!*cp || *cp != '/') |
979 |
|
goto out; |
980 |
|
/* Adjust root directory for open_exec(). */ |
981 |
|
while (depth) { |
982 |
|
cp = strchr(cp + 1, '/'); |
983 |
|
if (!cp) |
984 |
|
goto out; |
985 |
|
depth--; |
986 |
|
} |
987 |
|
memmove(ee->handler_path, cp, strlen(cp) + 1); |
988 |
|
cp = ee->handler_path; |
989 |
|
retval = copy_strings_kernel(1, &cp, bprm); |
990 |
|
if (retval < 0) |
991 |
|
goto out; |
992 |
|
bprm->argc++; |
993 |
|
} |
994 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) |
995 |
|
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) |
996 |
|
bprm->argv_len = bprm->exec - bprm->p; |
997 |
#endif |
#endif |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) |
|
|
retval = copy_strings_kernel(1, &bprm->interp, bprm); |
|
|
#else |
|
|
retval = copy_strings_kernel(1, &bprm->filename, bprm); |
|
998 |
#endif |
#endif |
999 |
if (retval < 0) return retval; |
|
1000 |
bprm->argc++; |
/* |
1001 |
retval = copy_strings_kernel(1, &domainname, bprm); |
* OK, now restart the process with execute handler program's dentry. |
1002 |
if (retval < 0) return retval; |
*/ |
1003 |
bprm->argc++; |
filp = open_exec(ee->handler_path); |
1004 |
retval = copy_strings_kernel(1, &alt_exec, bprm); |
if (IS_ERR(filp)) { |
1005 |
if (retval < 0) return retval; |
retval = PTR_ERR(filp); |
1006 |
bprm->argc++; |
goto out; |
1007 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) |
} |
1008 |
bprm->interp = alt_exec; |
ee->obj.path1.dentry = filp->f_dentry; |
1009 |
#endif |
ee->obj.path1.mnt = filp->f_vfsmnt; |
1010 |
filp = open_exec(alt_exec); |
bprm->file = filp; |
1011 |
if (IS_ERR(filp)) return PTR_ERR(filp); |
bprm->filename = ee->handler_path; |
1012 |
bprm->file= filp; |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
1013 |
bprm->filename = alt_exec; |
bprm->interp = bprm->filename; |
1014 |
return prepare_binprm(bprm); |
#endif |
1015 |
|
retval = prepare_binprm(bprm); |
1016 |
|
if (retval < 0) |
1017 |
|
goto out; |
1018 |
|
task->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
1019 |
|
retval = ccs_find_next_domain(ee); |
1020 |
|
task->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
1021 |
|
out: |
1022 |
|
return retval; |
1023 |
} |
} |
1024 |
|
|
1025 |
|
/** |
1026 |
|
* ccs_find_execute_handler - Find an execute handler. |
1027 |
|
* |
1028 |
|
* @ee: Pointer to "struct ccs_execve". |
1029 |
|
* @type: Type of execute handler. |
1030 |
|
* |
1031 |
|
* Returns true if found, false otherwise. |
1032 |
|
* |
1033 |
|
* Caller holds ccs_read_lock(). |
1034 |
|
*/ |
1035 |
|
static bool ccs_find_execute_handler(struct ccs_execve *ee, const u8 type) |
1036 |
|
{ |
1037 |
|
struct ccs_request_info *r = &ee->r; |
1038 |
|
const struct ccs_domain_info *domain = ccs_current_domain(); |
1039 |
|
struct ccs_acl_info *ptr; |
1040 |
|
/* |
1041 |
|
* To avoid infinite execute handler loop, don't use execute handler |
1042 |
|
* if the current process is marked as execute handler . |
1043 |
|
*/ |
1044 |
|
if (current->ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER) |
1045 |
|
return false; |
1046 |
|
retry: |
1047 |
|
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
1048 |
|
struct ccs_execute_handler *acl; |
1049 |
|
if (ptr->type != type || !ccs_condition(r, ptr->cond)) |
1050 |
|
continue; |
1051 |
|
acl = container_of(ptr, struct ccs_execute_handler, head); |
1052 |
|
ee->handler = acl->handler; |
1053 |
|
ee->handler_type = type; |
1054 |
|
r->cond = ptr->cond; |
1055 |
|
return true; |
1056 |
|
} |
1057 |
|
if (domain != &ccs_global_domain && |
1058 |
|
!domain->flags[CCS_DIF_IGNORE_GLOBAL]) { |
1059 |
|
domain = &ccs_global_domain; |
1060 |
|
goto retry; |
1061 |
|
} |
1062 |
|
return false; |
1063 |
|
} |
1064 |
|
|
1065 |
|
#ifdef CONFIG_MMU |
1066 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) |
1067 |
|
#define CCS_BPRM_MMU |
1068 |
|
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR >= 3 |
1069 |
|
#define CCS_BPRM_MMU |
1070 |
|
#elif defined(AX_MAJOR) && AX_MAJOR == 3 && defined(AX_MINOR) && AX_MINOR >= 2 |
1071 |
|
#define CCS_BPRM_MMU |
1072 |
|
#endif |
1073 |
#endif |
#endif |
1074 |
|
|
1075 |
int search_binary_handler_with_transition(struct linux_binprm *bprm, struct pt_regs *regs) |
/** |
1076 |
{ |
* ccs_dump_page - Dump a page to buffer. |
1077 |
struct domain_info *next_domain = NULL, *prev_domain = current->domain_info; |
* |
1078 |
int retval; |
* @bprm: Pointer to "struct linux_binprm". |
1079 |
char *alt_exec = NULL; /* Keep valid until search_binary_handler() finishes. */ |
* @pos: Location to dump. |
1080 |
#if defined(CONFIG_SAKURA) || defined(CONFIG_TOMOYO) |
* @dump: Poiner to "struct ccs_page_dump". |
1081 |
extern void CCS_LoadPolicy(const char *filename); |
* |
1082 |
CCS_LoadPolicy(bprm->filename); |
* Returns true on success, false otherwise. |
1083 |
#endif |
*/ |
1084 |
#if defined(CONFIG_TOMOYO) |
bool ccs_dump_page(struct linux_binprm *bprm, unsigned long pos, |
1085 |
retval = FindNextDomain(bprm, &next_domain, 1); |
struct ccs_page_dump *dump) |
1086 |
if (retval == -EPERM && try_alt_exec(bprm, &alt_exec) >= 0) { |
{ |
1087 |
current->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
struct page *page; |
1088 |
retval = FindNextDomain(bprm, &next_domain, 0); |
/* dump->data is released by ccs_finish_execve(). */ |
1089 |
current->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
if (!dump->data) { |
1090 |
} |
dump->data = kzalloc(PAGE_SIZE, CCS_GFP_FLAGS); |
1091 |
if (retval == 0) { |
if (!dump->data) |
1092 |
current->domain_info = next_domain; |
return false; |
1093 |
retval = CheckEnviron(bprm); |
} |
1094 |
current->tomoyo_flags |= TOMOYO_CHECK_READ_FOR_OPEN_EXEC; |
/* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ |
1095 |
if (!retval) retval = search_binary_handler(bprm, regs); |
#ifdef CCS_BPRM_MMU |
1096 |
current->tomoyo_flags &= ~TOMOYO_CHECK_READ_FOR_OPEN_EXEC; |
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
1097 |
if (retval < 0) current->domain_info = prev_domain; |
return false; |
|
} |
|
|
ccs_free(alt_exec); |
|
|
return retval; |
|
1098 |
#else |
#else |
1099 |
return search_binary_handler(bprm, regs); |
page = bprm->page[pos / PAGE_SIZE]; |
1100 |
#endif |
#endif |
1101 |
|
if (page != dump->page) { |
1102 |
|
const unsigned int offset = pos % PAGE_SIZE; |
1103 |
|
/* |
1104 |
|
* Maybe kmap()/kunmap() should be used here. |
1105 |
|
* But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). |
1106 |
|
* So do I. |
1107 |
|
*/ |
1108 |
|
char *kaddr = kmap_atomic(page, KM_USER0); |
1109 |
|
dump->page = page; |
1110 |
|
memcpy(dump->data + offset, kaddr + offset, |
1111 |
|
PAGE_SIZE - offset); |
1112 |
|
kunmap_atomic(kaddr, KM_USER0); |
1113 |
|
} |
1114 |
|
/* Same with put_arg_page(page) in fs/exec.c */ |
1115 |
|
#ifdef CCS_BPRM_MMU |
1116 |
|
put_page(page); |
1117 |
|
#endif |
1118 |
|
return true; |
1119 |
|
} |
1120 |
|
|
1121 |
|
/** |
1122 |
|
* ccs_start_execve - Prepare for execve() operation. |
1123 |
|
* |
1124 |
|
* @bprm: Pointer to "struct linux_binprm". |
1125 |
|
* @eep: Pointer to "struct ccs_execve *". |
1126 |
|
* |
1127 |
|
* Returns 0 on success, negative value otherwise. |
1128 |
|
*/ |
1129 |
|
static int ccs_start_execve(struct linux_binprm *bprm, |
1130 |
|
struct ccs_execve **eep) |
1131 |
|
{ |
1132 |
|
int retval; |
1133 |
|
struct task_struct *task = current; |
1134 |
|
struct ccs_execve *ee; |
1135 |
|
*eep = NULL; |
1136 |
|
ee = kzalloc(sizeof(*ee), CCS_GFP_FLAGS); |
1137 |
|
if (!ee) |
1138 |
|
return -ENOMEM; |
1139 |
|
ee->tmp = kzalloc(CCS_EXEC_TMPSIZE, CCS_GFP_FLAGS); |
1140 |
|
if (!ee->tmp) { |
1141 |
|
kfree(ee); |
1142 |
|
return -ENOMEM; |
1143 |
|
} |
1144 |
|
ee->reader_idx = ccs_read_lock(); |
1145 |
|
/* ee->dump->data is allocated by ccs_dump_page(). */ |
1146 |
|
ee->previous_domain = task->ccs_domain_info; |
1147 |
|
/* Clear manager flag. */ |
1148 |
|
task->ccs_flags &= ~CCS_TASK_IS_MANAGER; |
1149 |
|
*eep = ee; |
1150 |
|
ccs_init_request_info(&ee->r, CCS_MAC_FILE_EXECUTE); |
1151 |
|
ee->r.ee = ee; |
1152 |
|
ee->bprm = bprm; |
1153 |
|
ee->r.obj = &ee->obj; |
1154 |
|
ee->obj.path1.dentry = bprm->file->f_dentry; |
1155 |
|
ee->obj.path1.mnt = bprm->file->f_vfsmnt; |
1156 |
|
/* |
1157 |
|
* No need to call ccs_environ() for execute handler because envp[] is |
1158 |
|
* moved to argv[]. |
1159 |
|
*/ |
1160 |
|
if (ccs_find_execute_handler(ee, CCS_TYPE_EXECUTE_HANDLER)) |
1161 |
|
return ccs_try_alt_exec(ee); |
1162 |
|
retval = ccs_find_next_domain(ee); |
1163 |
|
if (retval == -EPERM) { |
1164 |
|
if (ccs_find_execute_handler(ee, |
1165 |
|
CCS_TYPE_DENIED_EXECUTE_HANDLER)) |
1166 |
|
return ccs_try_alt_exec(ee); |
1167 |
|
} |
1168 |
|
if (!retval) |
1169 |
|
retval = ccs_environ(ee); |
1170 |
|
return retval; |
1171 |
|
} |
1172 |
|
|
1173 |
|
/** |
1174 |
|
* ccs_finish_execve - Clean up execve() operation. |
1175 |
|
* |
1176 |
|
* @retval: Return code of an execve() operation. |
1177 |
|
* @ee: Pointer to "struct ccs_execve". |
1178 |
|
* |
1179 |
|
* Caller holds ccs_read_lock(). |
1180 |
|
*/ |
1181 |
|
static void ccs_finish_execve(int retval, struct ccs_execve *ee) |
1182 |
|
{ |
1183 |
|
struct task_struct *task = current; |
1184 |
|
if (!ee) |
1185 |
|
return; |
1186 |
|
if (retval < 0) { |
1187 |
|
task->ccs_domain_info = ee->previous_domain; |
1188 |
|
/* |
1189 |
|
* Make task->ccs_domain_info visible to GC before changing |
1190 |
|
* task->ccs_flags . |
1191 |
|
*/ |
1192 |
|
smp_mb(); |
1193 |
|
} else { |
1194 |
|
/* Mark the current process as execute handler. */ |
1195 |
|
if (ee->handler) |
1196 |
|
task->ccs_flags |= CCS_TASK_IS_EXECUTE_HANDLER; |
1197 |
|
/* Mark the current process as normal process. */ |
1198 |
|
else |
1199 |
|
task->ccs_flags &= ~CCS_TASK_IS_EXECUTE_HANDLER; |
1200 |
|
} |
1201 |
|
/* Tell GC that I finished execve(). */ |
1202 |
|
task->ccs_flags &= ~CCS_TASK_IS_IN_EXECVE; |
1203 |
|
ccs_read_unlock(ee->reader_idx); |
1204 |
|
kfree(ee->handler_path); |
1205 |
|
kfree(ee->tmp); |
1206 |
|
kfree(ee->dump.data); |
1207 |
|
kfree(ee); |
1208 |
|
} |
1209 |
|
|
1210 |
|
/** |
1211 |
|
* ccs_may_transit - Check permission and do domain transition without execve(). |
1212 |
|
* |
1213 |
|
* @domainname: Domainname to transit to. |
1214 |
|
* @pathname: Pathname to check. |
1215 |
|
* |
1216 |
|
* Returns 0 on success, negative value otherwise. |
1217 |
|
* |
1218 |
|
* Caller holds ccs_read_lock(). |
1219 |
|
*/ |
1220 |
|
int ccs_may_transit(const char *domainname, const char *pathname) |
1221 |
|
{ |
1222 |
|
struct ccs_path_info name; |
1223 |
|
struct ccs_request_info r; |
1224 |
|
struct ccs_domain_info *domain; |
1225 |
|
int error; |
1226 |
|
bool domain_created = false; |
1227 |
|
name.name = pathname; |
1228 |
|
ccs_fill_path_info(&name); |
1229 |
|
/* Check allow_transit permission. */ |
1230 |
|
ccs_init_request_info(&r, CCS_MAC_FILE_TRANSIT); |
1231 |
|
error = ccs_path_permission(&r, CCS_TYPE_TRANSIT, &name); |
1232 |
|
if (error) |
1233 |
|
return error; |
1234 |
|
/* Check destination domain. */ |
1235 |
|
domain = ccs_find_domain(domainname); |
1236 |
|
if (!domain && r.mode != CCS_CONFIG_ENFORCING && |
1237 |
|
strlen(domainname) < CCS_EXEC_TMPSIZE - 10) { |
1238 |
|
domain = ccs_assign_domain(domainname, r.profile); |
1239 |
|
if (domain) |
1240 |
|
domain_created = true; |
1241 |
|
} |
1242 |
|
if (domain) { |
1243 |
|
error = 0; |
1244 |
|
current->ccs_domain_info = domain; |
1245 |
|
if (domain_created) |
1246 |
|
ccs_audit_domain_creation_log(); |
1247 |
|
} else { |
1248 |
|
error = -ENOENT; |
1249 |
|
} |
1250 |
|
return error; |
1251 |
} |
} |
1252 |
|
|
1253 |
/***** TOMOYO Linux end. *****/ |
static int __ccs_search_binary_handler(struct linux_binprm *bprm, |
1254 |
|
struct pt_regs *regs) |
1255 |
|
{ |
1256 |
|
struct ccs_execve *ee; |
1257 |
|
int retval; |
1258 |
|
if (!ccs_policy_loaded) |
1259 |
|
ccsecurity_exports.load_policy(bprm->filename); |
1260 |
|
retval = ccs_start_execve(bprm, &ee); |
1261 |
|
if (!retval) |
1262 |
|
retval = search_binary_handler(bprm, regs); |
1263 |
|
ccs_finish_execve(retval, ee); |
1264 |
|
return retval; |
1265 |
|
} |
1266 |
|
|
1267 |
|
void __init ccs_domain_init(void) |
1268 |
|
{ |
1269 |
|
ccsecurity_ops.search_binary_handler = __ccs_search_binary_handler; |
1270 |
|
} |