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: 1.8.0-pre 2010/09/01 |
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 |
|
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/* For compatibility with older kernels. */ |
|
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#ifndef for_each_process |
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#define for_each_process for_each_task |
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#endif |
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|
25 |
/* Variables definitions.*/ |
/* Variables definitions.*/ |
26 |
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|
27 |
|
/* The global domain. */ |
28 |
|
struct ccs_domain_info ccs_acl_group[CCS_MAX_ACL_GROUPS]; |
29 |
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|
30 |
/* The initial domain. */ |
/* The initial domain. */ |
31 |
struct ccs_domain_info ccs_kernel_domain; |
struct ccs_domain_info ccs_kernel_domain; |
32 |
|
|
33 |
/* The list for "struct ccs_domain_info". */ |
/* The list for "struct ccs_domain_info". */ |
34 |
LIST_HEAD(ccs_domain_list); |
LIST_HEAD(ccs_domain_list); |
35 |
|
|
36 |
/** |
struct list_head ccs_policy_list[CCS_MAX_POLICY]; |
37 |
* ccs_audit_execute_handler_log - Audit execute_handler log. |
struct list_head ccs_group_list[CCS_MAX_GROUP]; |
38 |
* |
struct list_head ccs_shared_list[CCS_MAX_LIST]; |
|
* @ee: Pointer to "struct ccs_execve_entry". |
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* @is_default: True if it is "execute_handler" log. |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int ccs_audit_execute_handler_log(struct ccs_execve_entry *ee, |
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const bool is_default) |
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{ |
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struct ccs_request_info *r = &ee->r; |
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const char *handler = ee->handler->name; |
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r->mode = ccs_get_mode(r->profile, CCS_MAC_FILE_EXECUTE); |
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return ccs_write_audit_log(true, r, "%s %s\n", |
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is_default ? CCS_KEYWORD_EXECUTE_HANDLER : |
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CCS_KEYWORD_DENIED_EXECUTE_HANDLER, handler); |
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} |
|
39 |
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|
40 |
/** |
/** |
41 |
* ccs_audit_domain_creation_log - Audit domain creation log. |
* ccs_update_policy - Update an entry for exception policy. |
42 |
* |
* |
43 |
* @domain: Pointer to "struct ccs_domain_info". |
* @new_entry: Pointer to "struct ccs_acl_info". |
44 |
|
* @size: Size of @new_entry in bytes. |
45 |
|
* @is_delete: True if it is a delete request. |
46 |
|
* @list: Pointer to "struct list_head". |
47 |
|
* @check_duplicate: Callback function to find duplicated entry. |
48 |
* |
* |
49 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
50 |
|
* |
51 |
|
* Caller holds ccs_read_lock(). |
52 |
*/ |
*/ |
53 |
static int ccs_audit_domain_creation_log(struct ccs_domain_info *domain) |
int ccs_update_policy(struct ccs_acl_head *new_entry, const int size, |
54 |
|
bool is_delete, struct list_head *list, |
55 |
|
bool (*check_duplicate) (const struct ccs_acl_head *, |
56 |
|
const struct ccs_acl_head *)) |
57 |
{ |
{ |
58 |
int error; |
int error = is_delete ? -ENOENT : -ENOMEM; |
59 |
struct ccs_request_info r; |
struct ccs_acl_head *entry; |
60 |
ccs_init_request_info(&r, domain, CCS_MAC_FILE_EXECUTE); |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
61 |
error = ccs_write_audit_log(false, &r, "use_profile %u\n", r.profile); |
return -ENOMEM; |
62 |
|
list_for_each_entry_rcu(entry, list, list) { |
63 |
|
if (!check_duplicate(entry, new_entry)) |
64 |
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continue; |
65 |
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entry->is_deleted = is_delete; |
66 |
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error = 0; |
67 |
|
break; |
68 |
|
} |
69 |
|
if (error && !is_delete) { |
70 |
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entry = ccs_commit_ok(new_entry, size); |
71 |
|
if (entry) { |
72 |
|
list_add_tail_rcu(&entry->list, list); |
73 |
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error = 0; |
74 |
|
} |
75 |
|
} |
76 |
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mutex_unlock(&ccs_policy_lock); |
77 |
return error; |
return error; |
78 |
} |
} |
79 |
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|
80 |
/* The list for "struct ccs_domain_initializer_entry". */ |
static inline bool ccs_same_acl_head(const struct ccs_acl_info *p1, |
81 |
LIST_HEAD(ccs_domain_initializer_list); |
const struct ccs_acl_info *p2) |
82 |
|
{ |
83 |
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return p1->type == p2->type && p1->cond == p2->cond; |
84 |
|
} |
85 |
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|
86 |
/** |
/** |
87 |
* ccs_update_domain_initializer_entry - Update "struct ccs_domain_initializer_entry" list. |
* ccs_update_domain - Update an entry for domain policy. |
88 |
* |
* |
89 |
* @domainname: The name of domain. May be NULL. |
* @new_entry: Pointer to "struct ccs_acl_info". |
90 |
* @program: The name of program. |
* @size: Size of @new_entry in bytes. |
91 |
* @is_not: True if it is "no_initialize_domain" entry. |
* @param: Pointer to "struct ccs_acl_param". |
92 |
* @is_delete: True if it is a delete request. |
* @check_duplicate: Callback function to find duplicated entry. |
93 |
|
* @merge_duplicate: Callback function to merge duplicated entry. Maybe NULL. |
94 |
* |
* |
95 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
96 |
|
* |
97 |
|
* Caller holds ccs_read_lock(). |
98 |
*/ |
*/ |
99 |
static int ccs_update_domain_initializer_entry(const char *domainname, |
int ccs_update_domain(struct ccs_acl_info *new_entry, const int size, |
100 |
const char *program, |
struct ccs_acl_param *param, |
101 |
const bool is_not, |
bool (*check_duplicate) (const struct ccs_acl_info *, |
102 |
const bool is_delete) |
const struct ccs_acl_info *), |
103 |
{ |
bool (*merge_duplicate) (struct ccs_acl_info *, |
104 |
struct ccs_domain_initializer_entry *entry = NULL; |
struct ccs_acl_info *, |
105 |
struct ccs_domain_initializer_entry *ptr; |
const bool)) |
106 |
struct ccs_domain_initializer_entry e = { .is_not = is_not }; |
{ |
107 |
int error = is_delete ? -ENOENT : -ENOMEM; |
int error = param->is_delete ? -ENOENT : -ENOMEM; |
108 |
if (!ccs_is_correct_path(program, 1, -1, -1)) |
struct ccs_acl_info *entry; |
109 |
return -EINVAL; /* No patterns allowed. */ |
const u8 type = new_entry->type; |
110 |
if (domainname) { |
const u8 i = type == CCS_TYPE_AUTO_EXECUTE_HANDLER || |
111 |
if (!ccs_is_domain_def(domainname) && |
type == CCS_TYPE_DENIED_EXECUTE_HANDLER || |
112 |
ccs_is_correct_path(domainname, 1, -1, -1)) |
type == CCS_TYPE_AUTO_TASK_ACL; |
113 |
e.is_last_name = true; |
const bool is_delete = param->is_delete; |
114 |
else if (!ccs_is_correct_domain(domainname)) |
struct ccs_domain_info * const domain = param->domain; |
115 |
|
if (param->data[0]) { |
116 |
|
new_entry->cond = ccs_get_condition(param->data); |
117 |
|
if (!new_entry->cond) |
118 |
return -EINVAL; |
return -EINVAL; |
|
e.domainname = ccs_get_name(domainname); |
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if (!e.domainname) |
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goto out; |
|
119 |
} |
} |
120 |
e.program = ccs_get_name(program); |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
|
if (!e.program) |
|
121 |
goto out; |
goto out; |
122 |
if (!is_delete) |
list_for_each_entry_rcu(entry, &domain->acl_info_list[i], list) { |
123 |
entry = kmalloc(sizeof(e), GFP_KERNEL); |
if (!ccs_same_acl_head(entry, new_entry) || |
124 |
mutex_lock(&ccs_policy_lock); |
!check_duplicate(entry, new_entry)) |
|
list_for_each_entry_rcu(ptr, &ccs_domain_initializer_list, list) { |
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if (ccs_memcmp(ptr, &e, offsetof(typeof(e), is_not), |
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sizeof(e))) |
|
125 |
continue; |
continue; |
126 |
ptr->is_deleted = is_delete; |
if (merge_duplicate) |
127 |
|
entry->is_deleted = merge_duplicate(entry, new_entry, |
128 |
|
is_delete); |
129 |
|
else |
130 |
|
entry->is_deleted = is_delete; |
131 |
error = 0; |
error = 0; |
132 |
break; |
break; |
133 |
} |
} |
134 |
if (!is_delete && error && ccs_commit_ok(entry, &e, sizeof(e))) { |
if (error && !is_delete) { |
135 |
list_add_tail_rcu(&entry->list, &ccs_domain_initializer_list); |
entry = ccs_commit_ok(new_entry, size); |
136 |
entry = NULL; |
if (entry) { |
137 |
error = 0; |
list_add_tail_rcu(&entry->list, |
138 |
|
&domain->acl_info_list[i]); |
139 |
|
error = 0; |
140 |
|
} |
141 |
} |
} |
142 |
mutex_unlock(&ccs_policy_lock); |
mutex_unlock(&ccs_policy_lock); |
143 |
out: |
out: |
144 |
ccs_put_name(e.domainname); |
ccs_put_condition(new_entry->cond); |
|
ccs_put_name(e.program); |
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kfree(entry); |
|
145 |
return error; |
return error; |
146 |
} |
} |
147 |
|
|
148 |
/** |
void ccs_check_acl(struct ccs_request_info *r, |
149 |
* ccs_read_domain_initializer_policy - Read "struct ccs_domain_initializer_entry" list. |
bool (*check_entry) (struct ccs_request_info *, |
150 |
* |
const struct ccs_acl_info *)) |
|
* @head: Pointer to "struct ccs_io_buffer". |
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* |
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* Returns true on success, false otherwise. |
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* |
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* Caller holds ccs_read_lock(). |
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*/ |
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bool ccs_read_domain_initializer_policy(struct ccs_io_buffer *head) |
|
151 |
{ |
{ |
152 |
struct list_head *pos; |
const struct ccs_domain_info *domain = ccs_current_domain(); |
153 |
bool done = true; |
struct ccs_acl_info *ptr; |
154 |
list_for_each_cookie(pos, head->read_var2, |
bool retried = false; |
155 |
&ccs_domain_initializer_list) { |
const u8 i = !check_entry; |
156 |
const char *no; |
retry: |
157 |
const char *from = ""; |
list_for_each_entry_rcu(ptr, &domain->acl_info_list[i], list) { |
|
const char *domain = ""; |
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struct ccs_domain_initializer_entry *ptr; |
|
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ptr = list_entry(pos, struct ccs_domain_initializer_entry, |
|
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list); |
|
158 |
if (ptr->is_deleted) |
if (ptr->is_deleted) |
159 |
continue; |
continue; |
160 |
no = ptr->is_not ? "no_" : ""; |
if (ptr->type != r->param_type) |
|
if (ptr->domainname) { |
|
|
from = " from "; |
|
|
domain = ptr->domainname->name; |
|
|
} |
|
|
done = ccs_io_printf(head, "%s" CCS_KEYWORD_INITIALIZE_DOMAIN |
|
|
"%s%s%s\n", no, ptr->program->name, from, |
|
|
domain); |
|
|
if (!done) |
|
|
break; |
|
|
} |
|
|
return done; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_write_domain_initializer_policy - Write "struct ccs_domain_initializer_entry" list. |
|
|
* |
|
|
* @data: String to parse. |
|
|
* @is_not: True if it is "no_initialize_domain" entry. |
|
|
* @is_delete: True if it is a delete request. |
|
|
* |
|
|
* Returns 0 on success, negative value otherwise. |
|
|
*/ |
|
|
int ccs_write_domain_initializer_policy(char *data, const bool is_not, |
|
|
const bool is_delete) |
|
|
{ |
|
|
char *cp = strstr(data, " from "); |
|
|
if (cp) { |
|
|
*cp = '\0'; |
|
|
return ccs_update_domain_initializer_entry(cp + 6, data, |
|
|
is_not, is_delete); |
|
|
} |
|
|
return ccs_update_domain_initializer_entry(NULL, data, is_not, |
|
|
is_delete); |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_is_domain_initializer - Check whether the given program causes domainname reinitialization. |
|
|
* |
|
|
* @domainname: The name of domain. |
|
|
* @program: The name of program. |
|
|
* @last_name: The last component of @domainname. |
|
|
* |
|
|
* Returns true if executing @program reinitializes domain transition, |
|
|
* false otherwise. |
|
|
* |
|
|
* Caller holds ccs_read_lock(). |
|
|
*/ |
|
|
static bool ccs_is_domain_initializer(const struct ccs_path_info *domainname, |
|
|
const struct ccs_path_info *program, |
|
|
const struct ccs_path_info *last_name) |
|
|
{ |
|
|
struct ccs_domain_initializer_entry *ptr; |
|
|
bool flag = false; |
|
|
list_for_each_entry_rcu(ptr, &ccs_domain_initializer_list, list) { |
|
|
if (ptr->is_deleted) |
|
161 |
continue; |
continue; |
162 |
if (ptr->domainname) { |
if (check_entry && !check_entry(r, ptr)) |
|
if (!ptr->is_last_name) { |
|
|
if (ptr->domainname != domainname) |
|
|
continue; |
|
|
} else { |
|
|
if (ccs_pathcmp(ptr->domainname, last_name)) |
|
|
continue; |
|
|
} |
|
|
} |
|
|
if (ccs_pathcmp(ptr->program, program)) |
|
163 |
continue; |
continue; |
164 |
if (ptr->is_not) { |
if (!ccs_condition(r, ptr->cond)) |
165 |
flag = false; |
continue; |
166 |
break; |
r->matched_acl = ptr; |
167 |
} |
r->granted = true; |
168 |
flag = true; |
return; |
169 |
|
} |
170 |
|
if (!retried) { |
171 |
|
retried = true; |
172 |
|
domain = &ccs_acl_group[domain->group]; |
173 |
|
goto retry; |
174 |
} |
} |
175 |
return flag; |
r->granted = false; |
176 |
} |
} |
177 |
|
|
178 |
/* The list for "struct ccs_domain_keeper_entry". */ |
static bool ccs_same_transition_control(const struct ccs_acl_head *a, |
179 |
LIST_HEAD(ccs_domain_keeper_list); |
const struct ccs_acl_head *b) |
180 |
|
{ |
181 |
|
const struct ccs_transition_control *p1 = container_of(a, typeof(*p1), |
182 |
|
head); |
183 |
|
const struct ccs_transition_control *p2 = container_of(b, typeof(*p2), |
184 |
|
head); |
185 |
|
return p1->type == p2->type && p1->is_last_name == p2->is_last_name |
186 |
|
&& p1->domainname == p2->domainname |
187 |
|
&& p1->program == p2->program; |
188 |
|
} |
189 |
|
|
190 |
/** |
/** |
191 |
* ccs_update_domain_keeper_entry - Update "struct ccs_domain_keeper_entry" list. |
* ccs_update_transition_control_entry - Update "struct ccs_transition_control" list. |
192 |
* |
* |
193 |
* @domainname: The name of domain. |
* @domainname: The name of domain. Maybe NULL. |
194 |
* @program: The name of program. May be NULL. |
* @program: The name of program. Maybe NULL. |
195 |
* @is_not: True if it is "no_keep_domain" entry. |
* @type: Type of transition. |
196 |
* @is_delete: True if it is a delete request. |
* @is_delete: True if it is a delete request. |
197 |
* |
* |
198 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
199 |
*/ |
*/ |
200 |
static int ccs_update_domain_keeper_entry(const char *domainname, |
static int ccs_update_transition_control_entry(const char *domainname, |
201 |
const char *program, |
const char *program, |
202 |
const bool is_not, |
const u8 type, |
203 |
const bool is_delete) |
const bool is_delete) |
204 |
{ |
{ |
205 |
struct ccs_domain_keeper_entry *entry = NULL; |
struct ccs_transition_control e = { .type = type }; |
|
struct ccs_domain_keeper_entry *ptr; |
|
|
struct ccs_domain_keeper_entry e = { .is_not = is_not }; |
|
206 |
int error = is_delete ? -ENOENT : -ENOMEM; |
int error = is_delete ? -ENOENT : -ENOMEM; |
207 |
if (!ccs_is_domain_def(domainname) && |
if (program && strcmp(program, "any")) { |
208 |
ccs_is_correct_path(domainname, 1, -1, -1)) |
if (!ccs_correct_path(program)) |
|
e.is_last_name = true; |
|
|
else if (!ccs_is_correct_domain(domainname)) |
|
|
return -EINVAL; |
|
|
if (program) { |
|
|
if (!ccs_is_correct_path(program, 1, -1, -1)) |
|
209 |
return -EINVAL; |
return -EINVAL; |
210 |
e.program = ccs_get_name(program); |
e.program = ccs_get_name(program); |
211 |
if (!e.program) |
if (!e.program) |
212 |
goto out; |
goto out; |
213 |
} |
} |
214 |
e.domainname = ccs_get_name(domainname); |
if (domainname && strcmp(domainname, "any")) { |
215 |
if (!e.domainname) |
if (!ccs_correct_domain(domainname)) { |
216 |
goto out; |
if (!ccs_correct_path(domainname)) |
217 |
if (!is_delete) |
goto out; |
218 |
entry = kmalloc(sizeof(e), GFP_KERNEL); |
e.is_last_name = true; |
219 |
mutex_lock(&ccs_policy_lock); |
} |
220 |
list_for_each_entry_rcu(ptr, &ccs_domain_keeper_list, list) { |
e.domainname = ccs_get_name(domainname); |
221 |
if (ccs_memcmp(ptr, &e, offsetof(typeof(e), is_not), |
if (!e.domainname) |
222 |
sizeof(e))) |
goto out; |
|
continue; |
|
|
ptr->is_deleted = is_delete; |
|
|
error = 0; |
|
|
break; |
|
|
} |
|
|
if (!is_delete && error && ccs_commit_ok(entry, &e, sizeof(e))) { |
|
|
list_add_tail_rcu(&entry->list, &ccs_domain_keeper_list); |
|
|
entry = NULL; |
|
|
error = 0; |
|
223 |
} |
} |
224 |
mutex_unlock(&ccs_policy_lock); |
error = ccs_update_policy(&e.head, sizeof(e), is_delete, |
225 |
|
&ccs_policy_list[CCS_ID_TRANSITION_CONTROL], |
226 |
|
ccs_same_transition_control); |
227 |
out: |
out: |
228 |
ccs_put_name(e.domainname); |
ccs_put_name(e.domainname); |
229 |
ccs_put_name(e.program); |
ccs_put_name(e.program); |
|
kfree(entry); |
|
230 |
return error; |
return error; |
231 |
} |
} |
232 |
|
|
233 |
/** |
/** |
234 |
* ccs_write_domain_keeper_policy - Write "struct ccs_domain_keeper_entry" list. |
* ccs_write_transition_control - Write "struct ccs_transition_control" list. |
235 |
* |
* |
236 |
* @data: String to parse. |
* @data: String to parse. |
|
* @is_not: True if it is "no_keep_domain" entry. |
|
237 |
* @is_delete: True if it is a delete request. |
* @is_delete: True if it is a delete request. |
238 |
|
* @type: Type of this entry. |
239 |
* |
* |
240 |
|
* Returns 0 on success, negative value otherwise. |
241 |
*/ |
*/ |
242 |
int ccs_write_domain_keeper_policy(char *data, const bool is_not, |
int ccs_write_transition_control(char *data, const bool is_delete, |
243 |
const bool is_delete) |
const u8 type) |
|
{ |
|
|
char *cp = strstr(data, " from "); |
|
|
if (cp) { |
|
|
*cp = '\0'; |
|
|
return ccs_update_domain_keeper_entry(cp + 6, data, |
|
|
is_not, is_delete); |
|
|
} |
|
|
return ccs_update_domain_keeper_entry(data, NULL, is_not, is_delete); |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_read_domain_keeper_policy - Read "struct ccs_domain_keeper_entry" list. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
* |
|
|
* Caller holds ccs_read_lock(). |
|
|
*/ |
|
|
bool ccs_read_domain_keeper_policy(struct ccs_io_buffer *head) |
|
244 |
{ |
{ |
245 |
struct list_head *pos; |
char *domainname = strstr(data, " from "); |
246 |
bool done = true; |
if (domainname) { |
247 |
list_for_each_cookie(pos, head->read_var2, |
*domainname = '\0'; |
248 |
&ccs_domain_keeper_list) { |
domainname += 6; |
249 |
struct ccs_domain_keeper_entry *ptr; |
} else if (type == CCS_TRANSITION_CONTROL_NO_KEEP || |
250 |
const char *no; |
type == CCS_TRANSITION_CONTROL_KEEP) { |
251 |
const char *from = ""; |
domainname = data; |
252 |
const char *program = ""; |
data = NULL; |
|
ptr = list_entry(pos, struct ccs_domain_keeper_entry, list); |
|
|
if (ptr->is_deleted) |
|
|
continue; |
|
|
no = ptr->is_not ? "no_" : ""; |
|
|
if (ptr->program) { |
|
|
from = " from "; |
|
|
program = ptr->program->name; |
|
|
} |
|
|
done = ccs_io_printf(head, "%s" CCS_KEYWORD_KEEP_DOMAIN |
|
|
"%s%s%s\n", no, program, from, |
|
|
ptr->domainname->name); |
|
|
if (!done) |
|
|
break; |
|
253 |
} |
} |
254 |
return done; |
return ccs_update_transition_control_entry(domainname, data, type, |
255 |
|
is_delete); |
256 |
} |
} |
257 |
|
|
258 |
/** |
/** |
259 |
* ccs_is_domain_keeper - Check whether the given program causes domain transition suppression. |
* ccs_transition_type - Get domain transition type. |
260 |
* |
* |
261 |
* @domainname: The name of domain. |
* @domainname: The name of domain. |
262 |
* @program: The name of program. |
* @program: The name of program. |
|
* @last_name: The last component of @domainname. |
|
263 |
* |
* |
264 |
* Returns true if executing @program supresses domain transition, |
* Returns CCS_TRANSITION_CONTROL_INITIALIZE if executing @program |
265 |
* false otherwise. |
* reinitializes domain transition, CCS_TRANSITION_CONTROL_KEEP if executing |
266 |
|
* @program suppresses domain transition, others otherwise. |
267 |
* |
* |
268 |
* Caller holds ccs_read_lock(). |
* Caller holds ccs_read_lock(). |
269 |
*/ |
*/ |
270 |
static bool ccs_is_domain_keeper(const struct ccs_path_info *domainname, |
static u8 ccs_transition_type(const struct ccs_path_info *domainname, |
271 |
const struct ccs_path_info *program, |
const struct ccs_path_info *program) |
272 |
const struct ccs_path_info *last_name) |
{ |
273 |
{ |
const struct ccs_transition_control *ptr; |
274 |
struct ccs_domain_keeper_entry *ptr; |
const char *last_name = ccs_last_word(domainname->name); |
275 |
bool flag = false; |
u8 type; |
276 |
list_for_each_entry_rcu(ptr, &ccs_domain_keeper_list, list) { |
for (type = 0; type < CCS_MAX_TRANSITION_TYPE; type++) { |
277 |
if (ptr->is_deleted) |
next: |
278 |
continue; |
list_for_each_entry_rcu(ptr, &ccs_policy_list |
279 |
if (!ptr->is_last_name) { |
[CCS_ID_TRANSITION_CONTROL], |
280 |
if (ptr->domainname != domainname) |
head.list) { |
281 |
|
if (ptr->head.is_deleted || ptr->type != type) |
282 |
continue; |
continue; |
283 |
} else { |
if (ptr->domainname) { |
284 |
if (ccs_pathcmp(ptr->domainname, last_name)) |
if (!ptr->is_last_name) { |
285 |
|
if (ptr->domainname != domainname) |
286 |
|
continue; |
287 |
|
} else { |
288 |
|
/* |
289 |
|
* Use direct strcmp() since this is |
290 |
|
* unlikely used. |
291 |
|
*/ |
292 |
|
if (strcmp(ptr->domainname->name, |
293 |
|
last_name)) |
294 |
|
continue; |
295 |
|
} |
296 |
|
} |
297 |
|
if (ptr->program && ccs_pathcmp(ptr->program, program)) |
298 |
continue; |
continue; |
299 |
|
if (type == CCS_TRANSITION_CONTROL_NO_INITIALIZE) { |
300 |
|
/* |
301 |
|
* Do not check for initialize_domain if |
302 |
|
* no_initialize_domain matched. |
303 |
|
*/ |
304 |
|
type = CCS_TRANSITION_CONTROL_NO_KEEP; |
305 |
|
goto next; |
306 |
|
} |
307 |
|
goto done; |
308 |
} |
} |
|
if (ptr->program && ccs_pathcmp(ptr->program, program)) |
|
|
continue; |
|
|
if (ptr->is_not) { |
|
|
flag = false; |
|
|
break; |
|
|
} |
|
|
flag = true; |
|
309 |
} |
} |
310 |
return flag; |
done: |
311 |
|
return type; |
312 |
} |
} |
313 |
|
|
314 |
/* The list for "struct ccs_aggregator_entry". */ |
static bool ccs_same_aggregator(const struct ccs_acl_head *a, |
315 |
LIST_HEAD(ccs_aggregator_list); |
const struct ccs_acl_head *b) |
316 |
|
{ |
317 |
|
const struct ccs_aggregator *p1 = container_of(a, typeof(*p1), head); |
318 |
|
const struct ccs_aggregator *p2 = container_of(b, typeof(*p2), head); |
319 |
|
return p1->original_name == p2->original_name && |
320 |
|
p1->aggregated_name == p2->aggregated_name; |
321 |
|
} |
322 |
|
|
323 |
/** |
/** |
324 |
* ccs_update_aggregator_entry - Update "struct ccs_aggregator_entry" list. |
* ccs_update_aggregator_entry - Update "struct ccs_aggregator" list. |
325 |
* |
* |
326 |
* @original_name: The original program's name. |
* @original_name: The original program's name. |
327 |
* @aggregated_name: The aggregated program's name. |
* @aggregated_name: The aggregated program's name. |
333 |
const char *aggregated_name, |
const char *aggregated_name, |
334 |
const bool is_delete) |
const bool is_delete) |
335 |
{ |
{ |
336 |
struct ccs_aggregator_entry *entry = NULL; |
struct ccs_aggregator e = { }; |
|
struct ccs_aggregator_entry *ptr; |
|
|
struct ccs_aggregator_entry e = { }; |
|
337 |
int error = is_delete ? -ENOENT : -ENOMEM; |
int error = is_delete ? -ENOENT : -ENOMEM; |
338 |
if (!ccs_is_correct_path(original_name, 1, 0, -1) || |
if (!ccs_correct_word(original_name) || |
339 |
!ccs_is_correct_path(aggregated_name, 1, -1, -1)) |
!ccs_correct_path(aggregated_name)) |
340 |
return -EINVAL; |
return -EINVAL; |
341 |
e.original_name = ccs_get_name(original_name); |
e.original_name = ccs_get_name(original_name); |
342 |
e.aggregated_name = ccs_get_name(aggregated_name); |
e.aggregated_name = ccs_get_name(aggregated_name); |
343 |
if (!e.original_name || !e.aggregated_name) |
if (!e.original_name || !e.aggregated_name || |
344 |
|
e.aggregated_name->is_patterned) /* No patterns allowed. */ |
345 |
goto out; |
goto out; |
346 |
if (!is_delete) |
error = ccs_update_policy(&e.head, sizeof(e), is_delete, |
347 |
entry = kmalloc(sizeof(e), GFP_KERNEL); |
&ccs_policy_list[CCS_ID_AGGREGATOR], |
348 |
mutex_lock(&ccs_policy_lock); |
ccs_same_aggregator); |
|
list_for_each_entry_rcu(ptr, &ccs_aggregator_list, list) { |
|
|
if (ccs_memcmp(ptr, &e, offsetof(typeof(e), original_name), |
|
|
sizeof(e))) |
|
|
continue; |
|
|
ptr->is_deleted = is_delete; |
|
|
error = 0; |
|
|
break; |
|
|
} |
|
|
if (!is_delete && error && ccs_commit_ok(entry, &e, sizeof(e))) { |
|
|
list_add_tail_rcu(&entry->list, &ccs_aggregator_list); |
|
|
entry = NULL; |
|
|
error = 0; |
|
|
} |
|
|
mutex_unlock(&ccs_policy_lock); |
|
349 |
out: |
out: |
350 |
ccs_put_name(e.original_name); |
ccs_put_name(e.original_name); |
351 |
ccs_put_name(e.aggregated_name); |
ccs_put_name(e.aggregated_name); |
|
kfree(entry); |
|
352 |
return error; |
return error; |
353 |
} |
} |
354 |
|
|
355 |
/** |
/** |
356 |
* ccs_read_aggregator_policy - Read "struct ccs_aggregator_entry" list. |
* ccs_write_aggregator - Write "struct ccs_aggregator" list. |
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
* |
|
|
* Caller holds ccs_read_lock(). |
|
|
*/ |
|
|
bool ccs_read_aggregator_policy(struct ccs_io_buffer *head) |
|
|
{ |
|
|
struct list_head *pos; |
|
|
bool done = true; |
|
|
list_for_each_cookie(pos, head->read_var2, &ccs_aggregator_list) { |
|
|
struct ccs_aggregator_entry *ptr; |
|
|
ptr = list_entry(pos, struct ccs_aggregator_entry, list); |
|
|
if (ptr->is_deleted) |
|
|
continue; |
|
|
done = ccs_io_printf(head, CCS_KEYWORD_AGGREGATOR "%s %s\n", |
|
|
ptr->original_name->name, |
|
|
ptr->aggregated_name->name); |
|
|
if (!done) |
|
|
break; |
|
|
} |
|
|
return done; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_write_aggregator_policy - Write "struct ccs_aggregator_entry" list. |
|
357 |
* |
* |
358 |
* @data: String to parse. |
* @data: String to parse. |
359 |
* @is_delete: True if it is a delete request. |
* @is_delete: True if it is a delete request. |
360 |
* |
* |
361 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
362 |
*/ |
*/ |
363 |
int ccs_write_aggregator_policy(char *data, const bool is_delete) |
int ccs_write_aggregator(char *data, const bool is_delete) |
364 |
{ |
{ |
365 |
char *w[2]; |
char *w[2]; |
366 |
if (!ccs_tokenize(data, w, sizeof(w)) || !w[1][0]) |
if (!ccs_tokenize(data, w, sizeof(w)) || !w[1][0]) |
383 |
struct ccs_path_info name; |
struct ccs_path_info name; |
384 |
name.name = domainname; |
name.name = domainname; |
385 |
ccs_fill_path_info(&name); |
ccs_fill_path_info(&name); |
386 |
mutex_lock(&ccs_policy_lock); |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
387 |
|
return 0; |
388 |
/* Is there an active domain? */ |
/* Is there an active domain? */ |
389 |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
390 |
/* Never delete ccs_kernel_domain */ |
/* Never delete ccs_kernel_domain */ |
401 |
} |
} |
402 |
|
|
403 |
/** |
/** |
404 |
* ccs_find_or_assign_new_domain - Create a domain. |
* ccs_assign_domain - Create a domain. |
405 |
* |
* |
406 |
* @domainname: The name of domain. |
* @domainname: The name of domain. |
407 |
* @profile: Profile number to assign if the domain was newly created. |
* @profile: Profile number to assign if the domain was newly created. |
408 |
|
* @group: Group number to assign if the domain was newly created. |
409 |
|
* @transit: True if transit to domain found or created. |
410 |
* |
* |
411 |
* Returns pointer to "struct ccs_domain_info" on success, NULL otherwise. |
* Returns pointer to "struct ccs_domain_info" on success, NULL otherwise. |
412 |
|
* |
413 |
|
* Caller holds ccs_read_lock(). |
414 |
*/ |
*/ |
415 |
struct ccs_domain_info *ccs_find_or_assign_new_domain(const char *domainname, |
struct ccs_domain_info *ccs_assign_domain(const char *domainname, |
416 |
const u8 profile) |
const u8 profile, const u8 group, |
417 |
{ |
const bool transit) |
418 |
struct ccs_domain_info *entry; |
{ |
419 |
struct ccs_domain_info *domain; |
struct ccs_domain_info e = { }; |
420 |
const struct ccs_path_info *saved_domainname; |
struct ccs_domain_info *entry = ccs_find_domain(domainname); |
421 |
bool found = false; |
bool created = false; |
422 |
|
if (entry) |
423 |
if (!ccs_is_correct_domain(domainname)) |
goto out; |
424 |
|
if (strlen(domainname) >= CCS_EXEC_TMPSIZE - 10 || |
425 |
|
!ccs_correct_domain(domainname)) |
426 |
return NULL; |
return NULL; |
427 |
saved_domainname = ccs_get_name(domainname); |
e.profile = profile; |
428 |
if (!saved_domainname) |
e.group = group; |
429 |
|
e.domainname = ccs_get_name(domainname); |
430 |
|
if (!e.domainname) |
431 |
return NULL; |
return NULL; |
432 |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
433 |
mutex_lock(&ccs_policy_lock); |
goto out; |
434 |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
entry = ccs_find_domain(domainname); |
435 |
if (domain->is_deleted || |
if (!entry) { |
436 |
ccs_pathcmp(saved_domainname, domain->domainname)) |
entry = ccs_commit_ok(&e, sizeof(e)); |
437 |
continue; |
if (entry) { |
438 |
found = true; |
INIT_LIST_HEAD(&entry->acl_info_list[0]); |
439 |
break; |
INIT_LIST_HEAD(&entry->acl_info_list[1]); |
440 |
} |
list_add_tail_rcu(&entry->list, &ccs_domain_list); |
441 |
if (!found && ccs_memory_ok(entry, sizeof(*entry))) { |
created = true; |
442 |
INIT_LIST_HEAD(&entry->acl_info_list); |
} |
|
entry->domainname = saved_domainname; |
|
|
saved_domainname = NULL; |
|
|
entry->profile = profile; |
|
|
list_add_tail_rcu(&entry->list, &ccs_domain_list); |
|
|
domain = entry; |
|
|
entry = NULL; |
|
|
found = true; |
|
443 |
} |
} |
444 |
mutex_unlock(&ccs_policy_lock); |
mutex_unlock(&ccs_policy_lock); |
445 |
ccs_put_name(saved_domainname); |
out: |
446 |
kfree(entry); |
ccs_put_name(e.domainname); |
447 |
return found ? domain : NULL; |
if (entry && transit) { |
448 |
|
current->ccs_domain_info = entry; |
449 |
|
if (created) { |
450 |
|
struct ccs_request_info r; |
451 |
|
ccs_init_request_info(&r, CCS_MAC_FILE_EXECUTE); |
452 |
|
r.granted = false; |
453 |
|
ccs_write_log(&r, "use_profile %u\n", r.profile); |
454 |
|
} |
455 |
|
} |
456 |
|
return entry; |
457 |
} |
} |
458 |
|
|
459 |
/** |
/** |
460 |
* ccs_find_next_domain - Find a domain. |
* ccs_find_next_domain - Find a domain. |
461 |
* |
* |
462 |
* @ee: Pointer to "struct ccs_execve_entry". |
* @ee: Pointer to "struct ccs_execve". |
463 |
* |
* |
464 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
465 |
* |
* |
466 |
* Caller holds ccs_read_lock(). |
* Caller holds ccs_read_lock(). |
467 |
*/ |
*/ |
468 |
static int ccs_find_next_domain(struct ccs_execve_entry *ee) |
static int ccs_find_next_domain(struct ccs_execve *ee) |
469 |
{ |
{ |
470 |
struct ccs_request_info *r = &ee->r; |
struct ccs_request_info *r = &ee->r; |
471 |
const struct ccs_path_info *handler = ee->handler; |
const struct ccs_path_info *handler = ee->handler; |
472 |
struct ccs_domain_info *domain = NULL; |
struct ccs_domain_info *domain = NULL; |
473 |
const char *old_domain_name = r->domain->domainname->name; |
struct ccs_domain_info * const old_domain = ccs_current_domain(); |
474 |
struct linux_binprm *bprm = ee->bprm; |
struct linux_binprm *bprm = ee->bprm; |
475 |
const u32 ccs_flags = current->ccs_flags; |
struct task_struct *task = current; |
476 |
struct ccs_path_info rn = { }; /* real name */ |
struct ccs_path_info rn = { }; /* real name */ |
|
struct ccs_path_info ln; /* last name */ |
|
477 |
int retval; |
int retval; |
478 |
bool need_kfree = false; |
bool need_kfree = false; |
|
ln.name = ccs_last_word(old_domain_name); |
|
|
ccs_fill_path_info(&ln); |
|
479 |
retry: |
retry: |
480 |
current->ccs_flags = ccs_flags; |
r->matched_acl = NULL; |
|
r->cond = NULL; |
|
481 |
if (need_kfree) { |
if (need_kfree) { |
482 |
kfree(rn.name); |
kfree(rn.name); |
483 |
need_kfree = false; |
need_kfree = false; |
501 |
goto out; |
goto out; |
502 |
} |
} |
503 |
} else { |
} else { |
504 |
struct ccs_aggregator_entry *ptr; |
struct ccs_aggregator *ptr; |
505 |
/* Check 'aggregator' directive. */ |
/* Check 'aggregator' directive. */ |
506 |
list_for_each_entry_rcu(ptr, &ccs_aggregator_list, list) { |
list_for_each_entry_rcu(ptr, |
507 |
if (ptr->is_deleted || |
&ccs_policy_list[CCS_ID_AGGREGATOR], |
508 |
|
head.list) { |
509 |
|
if (ptr->head.is_deleted || |
510 |
!ccs_path_matches_pattern(&rn, ptr->original_name)) |
!ccs_path_matches_pattern(&rn, ptr->original_name)) |
511 |
continue; |
continue; |
512 |
kfree(rn.name); |
kfree(rn.name); |
517 |
} |
} |
518 |
|
|
519 |
/* Check execute permission. */ |
/* Check execute permission. */ |
520 |
retval = ccs_exec_perm(r, &rn); |
retval = ccs_path_permission(r, CCS_TYPE_EXECUTE, &rn); |
521 |
if (retval == 1) |
if (retval == CCS_RETRY_REQUEST) |
522 |
goto retry; |
goto retry; |
523 |
if (retval < 0) |
if (retval < 0) |
524 |
goto out; |
goto out; |
525 |
|
/* |
526 |
|
* To be able to specify domainnames with wildcards, use the |
527 |
|
* pathname specified in the policy (which may contain |
528 |
|
* wildcard) rather than the pathname passed to execve() |
529 |
|
* (which never contains wildcard). |
530 |
|
*/ |
531 |
|
if (r->param.path.matched_path) { |
532 |
|
if (need_kfree) |
533 |
|
kfree(rn.name); |
534 |
|
need_kfree = false; |
535 |
|
/* This is OK because it is read only. */ |
536 |
|
rn = *r->param.path.matched_path; |
537 |
|
} |
538 |
} |
} |
539 |
|
|
540 |
/* Calculate domain to transit to. */ |
/* Calculate domain to transit to. */ |
541 |
if (ccs_is_domain_initializer(r->domain->domainname, &rn, &ln)) { |
switch (ccs_transition_type(old_domain->domainname, &rn)) { |
542 |
|
case CCS_TRANSITION_CONTROL_INITIALIZE: |
543 |
/* Transit to the child of ccs_kernel_domain domain. */ |
/* Transit to the child of ccs_kernel_domain domain. */ |
544 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, ROOT_NAME " " "%s", |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, CCS_ROOT_NAME " " "%s", |
545 |
rn.name); |
rn.name); |
546 |
} else if (r->domain == &ccs_kernel_domain && !ccs_policy_loaded) { |
break; |
547 |
/* |
case CCS_TRANSITION_CONTROL_KEEP: |
|
* Needn't to transit from kernel domain before starting |
|
|
* /sbin/init. But transit from kernel domain if executing |
|
|
* initializers because they might start before /sbin/init. |
|
|
*/ |
|
|
domain = r->domain; |
|
|
} else if (ccs_is_domain_keeper(r->domain->domainname, &rn, &ln)) { |
|
548 |
/* Keep current domain. */ |
/* Keep current domain. */ |
549 |
domain = r->domain; |
domain = old_domain; |
550 |
} else { |
break; |
551 |
/* Normal domain transition. */ |
default: |
552 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s %s", |
if (old_domain == &ccs_kernel_domain && !ccs_policy_loaded) { |
553 |
old_domain_name, rn.name); |
/* |
554 |
} |
* Needn't to transit from kernel domain before |
555 |
if (domain || strlen(ee->tmp) >= CCS_EXEC_TMPSIZE - 10) |
* starting /sbin/init. But transit from kernel domain |
556 |
goto done; |
* if executing initializers because they might start |
557 |
domain = ccs_find_domain(ee->tmp); |
* before /sbin/init. |
558 |
if (domain) |
*/ |
559 |
goto done; |
domain = old_domain; |
560 |
if (r->mode == CCS_MAC_MODE_ENFORCING) { |
} else { |
561 |
int error = ccs_supervisor(r, "# wants to create domain\n" |
/* Normal domain transition. */ |
562 |
"%s\n", ee->tmp); |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s %s", |
563 |
if (error == 1) |
old_domain->domainname->name, rn.name); |
564 |
goto retry; |
} |
565 |
if (error < 0) |
break; |
|
goto done; |
|
566 |
} |
} |
567 |
domain = ccs_find_or_assign_new_domain(ee->tmp, r->profile); |
/* |
568 |
|
* Tell GC that I started execve(). |
569 |
|
* Also, tell open_exec() to check read permission. |
570 |
|
*/ |
571 |
|
task->ccs_flags |= CCS_TASK_IS_IN_EXECVE; |
572 |
|
/* |
573 |
|
* Make task->ccs_flags visible to GC before changing |
574 |
|
* task->ccs_domain_info . |
575 |
|
*/ |
576 |
|
smp_mb(); |
577 |
|
/* |
578 |
|
* Proceed to the next domain in order to allow reaching via PID. |
579 |
|
* It will be reverted if execve() failed. Reverting is not good. |
580 |
|
* But it is better than being unable to reach via PID in interactive |
581 |
|
* enforcing mode. |
582 |
|
*/ |
583 |
|
if (!domain) |
584 |
|
domain = ccs_assign_domain(ee->tmp, r->profile, |
585 |
|
old_domain->group, true); |
586 |
if (domain) |
if (domain) |
|
ccs_audit_domain_creation_log(r->domain); |
|
|
done: |
|
|
if (!domain) { |
|
|
printk(KERN_WARNING "ERROR: Domain '%s' not defined.\n", |
|
|
ee->tmp); |
|
|
if (r->mode == CCS_MAC_MODE_ENFORCING) |
|
|
retval = -EPERM; |
|
|
else { |
|
|
retval = 0; |
|
|
r->domain->domain_transition_failed = true; |
|
|
} |
|
|
} else { |
|
587 |
retval = 0; |
retval = 0; |
588 |
|
else if (r->mode == CCS_CONFIG_ENFORCING) |
589 |
|
retval = -ENOMEM; |
590 |
|
else { |
591 |
|
retval = 0; |
592 |
|
if (!old_domain->flags[CCS_DIF_TRANSITION_FAILED]) { |
593 |
|
old_domain->flags[CCS_DIF_TRANSITION_FAILED] = true; |
594 |
|
r->granted = false; |
595 |
|
ccs_write_log(r, "%s", |
596 |
|
ccs_dif[CCS_DIF_TRANSITION_FAILED]); |
597 |
|
printk(KERN_WARNING |
598 |
|
"ERROR: Domain '%s' not defined.\n", ee->tmp); |
599 |
|
} |
600 |
} |
} |
601 |
out: |
out: |
|
if (domain) |
|
|
r->domain = domain; |
|
602 |
if (need_kfree) |
if (need_kfree) |
603 |
kfree(rn.name); |
kfree(rn.name); |
604 |
return retval; |
return retval; |
607 |
/** |
/** |
608 |
* ccs_environ - Check permission for environment variable names. |
* ccs_environ - Check permission for environment variable names. |
609 |
* |
* |
610 |
* @ee: Pointer to "struct ccs_execve_entry". |
* @ee: Pointer to "struct ccs_execve". |
611 |
* |
* |
612 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
613 |
*/ |
*/ |
614 |
static int ccs_environ(struct ccs_execve_entry *ee) |
static int ccs_environ(struct ccs_execve *ee) |
615 |
{ |
{ |
616 |
struct ccs_request_info *r = &ee->r; |
struct ccs_request_info *r = &ee->r; |
617 |
struct linux_binprm *bprm = ee->bprm; |
struct linux_binprm *bprm = ee->bprm; |
618 |
char *arg_ptr = ee->tmp; |
/* env_page->data is allocated by ccs_dump_page(). */ |
619 |
|
struct ccs_page_dump env_page = { }; |
620 |
|
char *arg_ptr; /* Size is CCS_EXEC_TMPSIZE bytes */ |
621 |
int arg_len = 0; |
int arg_len = 0; |
622 |
unsigned long pos = bprm->p; |
unsigned long pos = bprm->p; |
623 |
int offset = pos % PAGE_SIZE; |
int offset = pos % PAGE_SIZE; |
625 |
int envp_count = bprm->envc; |
int envp_count = bprm->envc; |
626 |
/* printk(KERN_DEBUG "start %d %d\n", argv_count, envp_count); */ |
/* printk(KERN_DEBUG "start %d %d\n", argv_count, envp_count); */ |
627 |
int error = -ENOMEM; |
int error = -ENOMEM; |
628 |
|
ee->r.type = CCS_MAC_ENVIRON; |
629 |
|
ee->r.mode = ccs_get_mode(ccs_current_domain()->profile, |
630 |
|
CCS_MAC_ENVIRON); |
631 |
if (!r->mode || !envp_count) |
if (!r->mode || !envp_count) |
632 |
return 0; |
return 0; |
633 |
|
arg_ptr = kzalloc(CCS_EXEC_TMPSIZE, CCS_GFP_FLAGS); |
634 |
|
if (!arg_ptr) |
635 |
|
goto out; |
636 |
while (error == -ENOMEM) { |
while (error == -ENOMEM) { |
637 |
if (!ccs_dump_page(bprm, pos, &ee->dump)) |
if (!ccs_dump_page(bprm, pos, &env_page)) |
638 |
goto out; |
goto out; |
639 |
pos += PAGE_SIZE - offset; |
pos += PAGE_SIZE - offset; |
640 |
/* Read. */ |
/* Read. */ |
641 |
while (argv_count && offset < PAGE_SIZE) { |
while (argv_count && offset < PAGE_SIZE) { |
642 |
const char *kaddr = ee->dump.data; |
if (!env_page.data[offset++]) |
|
if (!kaddr[offset++]) |
|
643 |
argv_count--; |
argv_count--; |
644 |
} |
} |
645 |
if (argv_count) { |
if (argv_count) { |
647 |
continue; |
continue; |
648 |
} |
} |
649 |
while (offset < PAGE_SIZE) { |
while (offset < PAGE_SIZE) { |
650 |
const char *kaddr = ee->dump.data; |
const unsigned char c = env_page.data[offset++]; |
|
const unsigned char c = kaddr[offset++]; |
|
651 |
if (c && arg_len < CCS_EXEC_TMPSIZE - 10) { |
if (c && arg_len < CCS_EXEC_TMPSIZE - 10) { |
652 |
if (c == '=') { |
if (c == '=') { |
653 |
arg_ptr[arg_len++] = '\0'; |
arg_ptr[arg_len++] = '\0'; |
683 |
out: |
out: |
684 |
if (r->mode != 3) |
if (r->mode != 3) |
685 |
error = 0; |
error = 0; |
686 |
|
kfree(env_page.data); |
687 |
|
kfree(arg_ptr); |
688 |
return error; |
return error; |
689 |
} |
} |
690 |
|
|
727 |
*dest = '\0'; |
*dest = '\0'; |
728 |
} |
} |
729 |
|
|
730 |
/** |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36) |
731 |
* ccs_root_depth - Get number of directories to strip. |
static int ccs_copy_argv(const char *arg, struct linux_binprm *bprm) |
|
* |
|
|
* @dentry: Pointer to "struct dentry". |
|
|
* @vfsmnt: Pointer to "struct vfsmount". |
|
|
* |
|
|
* Returns number of directories to strip. |
|
|
*/ |
|
|
static inline int ccs_root_depth(struct dentry *dentry, struct vfsmount *vfsmnt) |
|
732 |
{ |
{ |
733 |
int depth = 0; |
const int ret = copy_strings_kernel(1, &arg, bprm); |
734 |
ccs_realpath_lock(); |
if (ret >= 0) |
735 |
for (;;) { |
bprm->argc++; |
736 |
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) { |
return ret; |
|
/* Global root? */ |
|
|
if (vfsmnt->mnt_parent == vfsmnt) |
|
|
break; |
|
|
dentry = vfsmnt->mnt_mountpoint; |
|
|
vfsmnt = vfsmnt->mnt_parent; |
|
|
continue; |
|
|
} |
|
|
dentry = dentry->d_parent; |
|
|
depth++; |
|
|
} |
|
|
ccs_realpath_unlock(); |
|
|
return depth; |
|
737 |
} |
} |
|
|
|
|
/** |
|
|
* ccs_get_root_depth - return the depth of root directory. |
|
|
* |
|
|
* Returns number of directories to strip. |
|
|
*/ |
|
|
static int ccs_get_root_depth(void) |
|
|
{ |
|
|
int depth; |
|
|
struct dentry *dentry; |
|
|
struct vfsmount *vfsmnt; |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
|
|
struct path root; |
|
|
#endif |
|
|
read_lock(¤t->fs->lock); |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
|
|
root = current->fs->root; |
|
|
path_get(¤t->fs->root); |
|
|
dentry = root.dentry; |
|
|
vfsmnt = root.mnt; |
|
|
#else |
|
|
dentry = dget(current->fs->root); |
|
|
vfsmnt = mntget(current->fs->rootmnt); |
|
|
#endif |
|
|
read_unlock(¤t->fs->lock); |
|
|
depth = ccs_root_depth(dentry, vfsmnt); |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
|
|
path_put(&root); |
|
738 |
#else |
#else |
739 |
dput(dentry); |
static int ccs_copy_argv(char *arg, struct linux_binprm *bprm) |
|
mntput(vfsmnt); |
|
|
#endif |
|
|
return depth; |
|
|
} |
|
|
|
|
|
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) |
|
740 |
{ |
{ |
741 |
if (!ee) |
const int ret = copy_strings_kernel(1, &arg, bprm); |
742 |
return; |
if (ret >= 0) |
743 |
spin_lock(&ccs_execve_list_lock); |
bprm->argc++; |
744 |
list_del(&ee->list); |
return ret; |
|
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); |
|
745 |
} |
} |
746 |
|
#endif |
747 |
|
|
748 |
/** |
/** |
749 |
* ccs_try_alt_exec - Try to start execute handler. |
* ccs_try_alt_exec - Try to start execute handler. |
750 |
* |
* |
751 |
* @ee: Pointer to "struct ccs_execve_entry". |
* @ee: Pointer to "struct ccs_execve". |
752 |
* |
* |
753 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
754 |
*/ |
*/ |
755 |
static int ccs_try_alt_exec(struct ccs_execve_entry *ee) |
static int ccs_try_alt_exec(struct ccs_execve *ee) |
756 |
{ |
{ |
757 |
/* |
/* |
758 |
* Contents of modified bprm. |
* Contents of modified bprm. |
766 |
* = 0 |
* = 0 |
767 |
* |
* |
768 |
* modified bprm->argv[0] |
* modified bprm->argv[0] |
769 |
* = the program's name specified by execute_handler |
* = the program's name specified by *_execute_handler |
770 |
* modified bprm->argv[1] |
* modified bprm->argv[1] |
771 |
* = ccs_current_domain()->domainname->name |
* = ccs_current_domain()->domainname->name |
772 |
* modified bprm->argv[2] |
* modified bprm->argv[2] |
798 |
struct task_struct *task = current; |
struct task_struct *task = current; |
799 |
|
|
800 |
/* Close the requested program's dentry. */ |
/* Close the requested program's dentry. */ |
801 |
|
ee->obj.path1.dentry = NULL; |
802 |
|
ee->obj.path1.mnt = NULL; |
803 |
|
ee->obj.validate_done = false; |
804 |
allow_write_access(bprm->file); |
allow_write_access(bprm->file); |
805 |
fput(bprm->file); |
fput(bprm->file); |
806 |
bprm->file = NULL; |
bprm->file = NULL; |
814 |
|
|
815 |
/* Set argv[6] */ |
/* Set argv[6] */ |
816 |
{ |
{ |
|
char *cp = ee->tmp; |
|
817 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_envc); |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_envc); |
818 |
retval = copy_strings_kernel(1, &cp, bprm); |
retval = ccs_copy_argv(ee->tmp, bprm); |
819 |
if (retval < 0) |
if (retval < 0) |
820 |
goto out; |
goto out; |
|
bprm->argc++; |
|
821 |
} |
} |
822 |
|
|
823 |
/* Set argv[5] */ |
/* Set argv[5] */ |
824 |
{ |
{ |
|
char *cp = ee->tmp; |
|
825 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_argc); |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_argc); |
826 |
retval = copy_strings_kernel(1, &cp, bprm); |
retval = ccs_copy_argv(ee->tmp, bprm); |
827 |
if (retval < 0) |
if (retval < 0) |
828 |
goto out; |
goto out; |
|
bprm->argc++; |
|
829 |
} |
} |
830 |
|
|
831 |
/* Set argv[4] */ |
/* Set argv[4] */ |
832 |
{ |
{ |
833 |
retval = copy_strings_kernel(1, &bprm->filename, bprm); |
retval = ccs_copy_argv(bprm->filename, bprm); |
834 |
if (retval < 0) |
if (retval < 0) |
835 |
goto out; |
goto out; |
|
bprm->argc++; |
|
836 |
} |
} |
837 |
|
|
838 |
/* Set argv[3] */ |
/* Set argv[3] */ |
839 |
{ |
{ |
|
char *cp = ee->tmp; |
|
|
const u32 ccs_flags = task->ccs_flags; |
|
840 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, |
841 |
"pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " |
"pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " |
842 |
"sgid=%d fsuid=%d fsgid=%d state[0]=%u " |
"sgid=%d fsuid=%d fsgid=%d", |
843 |
"state[1]=%u state[2]=%u", |
(pid_t) ccsecurity_exports.sys_getpid(), |
844 |
(pid_t) sys_getpid(), current_uid(), current_gid(), |
current_uid(), current_gid(), current_euid(), |
845 |
current_euid(), current_egid(), current_suid(), |
current_egid(), current_suid(), current_sgid(), |
846 |
current_sgid(), current_fsuid(), current_fsgid(), |
current_fsuid(), current_fsgid()); |
847 |
(u8) (ccs_flags >> 24), (u8) (ccs_flags >> 16), |
retval = ccs_copy_argv(ee->tmp, bprm); |
|
(u8) (ccs_flags >> 8)); |
|
|
retval = copy_strings_kernel(1, &cp, bprm); |
|
848 |
if (retval < 0) |
if (retval < 0) |
849 |
goto out; |
goto out; |
|
bprm->argc++; |
|
850 |
} |
} |
851 |
|
|
852 |
/* Set argv[2] */ |
/* Set argv[2] */ |
853 |
{ |
{ |
854 |
char *exe = (char *) ccs_get_exe(); |
char *exe = (char *) ccs_get_exe(); |
855 |
if (exe) { |
if (exe) { |
856 |
retval = copy_strings_kernel(1, &exe, bprm); |
retval = ccs_copy_argv(exe, bprm); |
857 |
kfree(exe); |
kfree(exe); |
858 |
} else { |
} else { |
859 |
exe = ee->tmp; |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36) |
860 |
|
retval = ccs_copy_argv("<unknown>", bprm); |
861 |
|
#else |
862 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "<unknown>"); |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "<unknown>"); |
863 |
retval = copy_strings_kernel(1, &exe, bprm); |
retval = ccs_copy_argv(ee->tmp, bprm); |
864 |
|
#endif |
865 |
} |
} |
866 |
if (retval < 0) |
if (retval < 0) |
867 |
goto out; |
goto out; |
|
bprm->argc++; |
|
868 |
} |
} |
869 |
|
|
870 |
/* Set argv[1] */ |
/* Set argv[1] */ |
871 |
{ |
{ |
872 |
char *cp = ee->tmp; |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36) |
873 |
|
retval = ccs_copy_argv(ccs_current_domain()->domainname->name, |
874 |
|
bprm); |
875 |
|
#else |
876 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s", |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s", |
877 |
ccs_current_domain()->domainname->name); |
ccs_current_domain()->domainname->name); |
878 |
retval = copy_strings_kernel(1, &cp, bprm); |
retval = ccs_copy_argv(ee->tmp, bprm); |
879 |
|
#endif |
880 |
if (retval < 0) |
if (retval < 0) |
881 |
goto out; |
goto out; |
|
bprm->argc++; |
|
882 |
} |
} |
883 |
|
|
884 |
/* Set argv[0] */ |
/* Set argv[0] */ |
885 |
{ |
{ |
886 |
int depth = ccs_get_root_depth(); |
struct path root; |
887 |
int len = ee->handler->total_len + 1; |
char *cp; |
888 |
char *cp = kmalloc(len, GFP_KERNEL); |
int root_len; |
889 |
|
int handler_len; |
890 |
|
get_fs_root(current->fs, &root); |
891 |
|
cp = ccs_realpath_from_path(&root); |
892 |
|
path_put(&root); |
893 |
if (!cp) { |
if (!cp) { |
894 |
retval = ENOMEM; |
retval = -ENOMEM; |
895 |
|
goto out; |
896 |
|
} |
897 |
|
root_len = strlen(cp); |
898 |
|
retval = strncmp(ee->handler->name, cp, root_len); |
899 |
|
root_len--; |
900 |
|
kfree(cp); |
901 |
|
if (retval) { |
902 |
|
retval = -ENOENT; |
903 |
goto out; |
goto out; |
904 |
} |
} |
905 |
|
handler_len = ee->handler->total_len + 1; |
906 |
|
cp = kmalloc(handler_len, CCS_GFP_FLAGS); |
907 |
|
if (!cp) { |
908 |
|
retval = -ENOMEM; |
909 |
|
goto out; |
910 |
|
} |
911 |
|
/* ee->handler_path is released by ccs_finish_execve(). */ |
912 |
ee->handler_path = cp; |
ee->handler_path = cp; |
913 |
memmove(cp, ee->handler->name, len); |
/* Adjust root directory for open_exec(). */ |
914 |
|
memmove(cp, ee->handler->name + root_len, |
915 |
|
handler_len - root_len); |
916 |
ccs_unescape(cp); |
ccs_unescape(cp); |
917 |
retval = -ENOENT; |
retval = -ENOENT; |
918 |
if (!*cp || *cp != '/') |
if (!*cp || *cp != '/') |
919 |
goto out; |
goto out; |
920 |
/* Adjust root directory for open_exec(). */ |
retval = ccs_copy_argv(cp, bprm); |
|
while (depth) { |
|
|
cp = strchr(cp + 1, '/'); |
|
|
if (!cp) |
|
|
goto out; |
|
|
depth--; |
|
|
} |
|
|
memmove(ee->handler_path, cp, strlen(cp) + 1); |
|
|
cp = ee->handler_path; |
|
|
retval = copy_strings_kernel(1, &cp, bprm); |
|
921 |
if (retval < 0) |
if (retval < 0) |
922 |
goto out; |
goto out; |
|
bprm->argc++; |
|
923 |
} |
} |
924 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) |
925 |
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) |
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) |
927 |
#endif |
#endif |
928 |
#endif |
#endif |
929 |
|
|
930 |
/* OK, now restart the process with execute handler program's dentry. */ |
/* |
931 |
|
* OK, now restart the process with execute handler program's dentry. |
932 |
|
*/ |
933 |
filp = open_exec(ee->handler_path); |
filp = open_exec(ee->handler_path); |
934 |
if (IS_ERR(filp)) { |
if (IS_ERR(filp)) { |
935 |
retval = PTR_ERR(filp); |
retval = PTR_ERR(filp); |
936 |
goto out; |
goto out; |
937 |
} |
} |
938 |
|
ee->obj.path1.dentry = filp->f_dentry; |
939 |
|
ee->obj.path1.mnt = filp->f_vfsmnt; |
940 |
bprm->file = filp; |
bprm->file = filp; |
941 |
bprm->filename = ee->handler_path; |
bprm->filename = ee->handler_path; |
942 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
955 |
/** |
/** |
956 |
* ccs_find_execute_handler - Find an execute handler. |
* ccs_find_execute_handler - Find an execute handler. |
957 |
* |
* |
958 |
* @ee: Pointer to "struct ccs_execve_entry". |
* @ee: Pointer to "struct ccs_execve". |
959 |
* @type: Type of execute handler. |
* @type: Type of execute handler. |
960 |
* |
* |
961 |
* Returns true if found, false otherwise. |
* Returns true if found, false otherwise. |
962 |
* |
* |
963 |
* Caller holds ccs_read_lock(). |
* Caller holds ccs_read_lock(). |
964 |
*/ |
*/ |
965 |
static bool ccs_find_execute_handler(struct ccs_execve_entry *ee, |
static bool ccs_find_execute_handler(struct ccs_execve *ee, const u8 type) |
|
const u8 type) |
|
966 |
{ |
{ |
967 |
struct task_struct *task = current; |
struct ccs_request_info *r = &ee->r; |
|
const struct ccs_domain_info *domain = ccs_current_domain(); |
|
|
struct ccs_acl_info *ptr; |
|
|
bool found = false; |
|
968 |
/* |
/* |
969 |
* Don't use execute handler if the current process is |
* To avoid infinite execute handler loop, don't use execute handler |
970 |
* marked as execute handler to avoid infinite execute handler loop. |
* if the current process is marked as execute handler . |
971 |
*/ |
*/ |
972 |
if (task->ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER) |
if (current->ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER) |
973 |
return false; |
return false; |
974 |
list_for_each_entry(ptr, &domain->acl_info_list, list) { |
r->param_type = type; |
975 |
struct ccs_execute_handler_record *acl; |
ccs_check_acl(r, NULL); |
976 |
if (ptr->type != type) |
if (!r->granted) |
977 |
continue; |
return false; |
978 |
acl = container_of(ptr, struct ccs_execute_handler_record, |
ee->handler = container_of(r->matched_acl, struct ccs_handler_acl, |
979 |
head); |
head)->handler; |
980 |
ee->handler = acl->handler; |
return true; |
|
found = true; |
|
|
break; |
|
|
} |
|
|
return found; |
|
981 |
} |
} |
982 |
|
|
983 |
|
#ifdef CONFIG_MMU |
984 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) |
985 |
|
#define CCS_BPRM_MMU |
986 |
|
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR >= 3 |
987 |
|
#define CCS_BPRM_MMU |
988 |
|
#elif defined(AX_MAJOR) && AX_MAJOR == 3 && defined(AX_MINOR) && AX_MINOR >= 2 |
989 |
|
#define CCS_BPRM_MMU |
990 |
|
#endif |
991 |
|
#endif |
992 |
|
|
993 |
/** |
/** |
994 |
* ccs_dump_page - Dump a page to buffer. |
* ccs_dump_page - Dump a page to buffer. |
995 |
* |
* |
1003 |
struct ccs_page_dump *dump) |
struct ccs_page_dump *dump) |
1004 |
{ |
{ |
1005 |
struct page *page; |
struct page *page; |
1006 |
/* dump->data is released by ccs_free_execve_entry(). */ |
/* dump->data is released by ccs_finish_execve(). */ |
1007 |
if (!dump->data) { |
if (!dump->data) { |
1008 |
dump->data = kzalloc(PAGE_SIZE, GFP_KERNEL); |
dump->data = kzalloc(PAGE_SIZE, CCS_GFP_FLAGS); |
1009 |
if (!dump->data) |
if (!dump->data) |
1010 |
return false; |
return false; |
1011 |
} |
} |
1012 |
/* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ |
/* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ |
1013 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
#ifdef CCS_BPRM_MMU |
|
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
|
|
return false; |
|
|
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR == 3 && defined(CONFIG_MMU) |
|
1014 |
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) |
1015 |
return false; |
return false; |
1016 |
#else |
#else |
1025 |
*/ |
*/ |
1026 |
char *kaddr = kmap_atomic(page, KM_USER0); |
char *kaddr = kmap_atomic(page, KM_USER0); |
1027 |
dump->page = page; |
dump->page = page; |
1028 |
memcpy(dump->data + offset, kaddr + offset, PAGE_SIZE - offset); |
memcpy(dump->data + offset, kaddr + offset, |
1029 |
|
PAGE_SIZE - offset); |
1030 |
kunmap_atomic(kaddr, KM_USER0); |
kunmap_atomic(kaddr, KM_USER0); |
1031 |
} |
} |
1032 |
/* Same with put_arg_page(page) in fs/exec.c */ |
/* Same with put_arg_page(page) in fs/exec.c */ |
1033 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
#ifdef CCS_BPRM_MMU |
|
put_page(page); |
|
|
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR == 3 && defined(CONFIG_MMU) |
|
1034 |
put_page(page); |
put_page(page); |
1035 |
#endif |
#endif |
1036 |
return true; |
return true; |
1037 |
} |
} |
1038 |
|
|
1039 |
/** |
/** |
|
* 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; |
|
|
} |
|
|
|
|
|
/** |
|
1040 |
* ccs_start_execve - Prepare for execve() operation. |
* ccs_start_execve - Prepare for execve() operation. |
1041 |
* |
* |
1042 |
* @bprm: Pointer to "struct linux_binprm". |
* @bprm: Pointer to "struct linux_binprm". |
1043 |
|
* @eep: Pointer to "struct ccs_execve *". |
1044 |
* |
* |
1045 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
1046 |
*/ |
*/ |
1047 |
int ccs_start_execve(struct linux_binprm *bprm) |
static int ccs_start_execve(struct linux_binprm *bprm, |
1048 |
|
struct ccs_execve **eep) |
1049 |
{ |
{ |
1050 |
int retval; |
int retval; |
1051 |
struct task_struct *task = current; |
struct task_struct *task = current; |
1052 |
struct ccs_execve_entry *ee = ccs_allocate_execve_entry(); |
struct ccs_execve *ee; |
1053 |
if (!ccs_policy_loaded) |
*eep = NULL; |
1054 |
ccs_load_policy(bprm->filename); |
ee = kzalloc(sizeof(*ee), CCS_GFP_FLAGS); |
1055 |
if (!ee) |
if (!ee) |
1056 |
return -ENOMEM; |
return -ENOMEM; |
1057 |
ccs_init_request_info(&ee->r, NULL, CCS_MAC_FILE_EXECUTE); |
ee->tmp = kzalloc(CCS_EXEC_TMPSIZE, CCS_GFP_FLAGS); |
1058 |
|
if (!ee->tmp) { |
1059 |
|
kfree(ee); |
1060 |
|
return -ENOMEM; |
1061 |
|
} |
1062 |
|
ee->reader_idx = ccs_read_lock(); |
1063 |
|
/* ee->dump->data is allocated by ccs_dump_page(). */ |
1064 |
|
ee->previous_domain = task->ccs_domain_info; |
1065 |
|
/* Clear manager flag. */ |
1066 |
|
task->ccs_flags &= ~CCS_TASK_IS_MANAGER; |
1067 |
|
*eep = ee; |
1068 |
|
ccs_init_request_info(&ee->r, CCS_MAC_FILE_EXECUTE); |
1069 |
ee->r.ee = ee; |
ee->r.ee = ee; |
1070 |
ee->bprm = bprm; |
ee->bprm = bprm; |
1071 |
ee->r.obj = &ee->obj; |
ee->r.obj = &ee->obj; |
1072 |
ee->obj.path1.dentry = bprm->file->f_dentry; |
ee->obj.path1.dentry = bprm->file->f_dentry; |
1073 |
ee->obj.path1.mnt = bprm->file->f_vfsmnt; |
ee->obj.path1.mnt = bprm->file->f_vfsmnt; |
1074 |
/* Clear manager flag. */ |
/* |
1075 |
task->ccs_flags &= ~CCS_TASK_IS_POLICY_MANAGER; |
* No need to call ccs_environ() for execute handler because envp[] is |
1076 |
if (ccs_find_execute_handler(ee, CCS_TYPE_EXECUTE_HANDLER)) { |
* moved to argv[]. |
1077 |
retval = ccs_try_alt_exec(ee); |
*/ |
1078 |
if (!retval) |
if (ccs_find_execute_handler(ee, CCS_TYPE_AUTO_EXECUTE_HANDLER)) |
1079 |
ccs_audit_execute_handler_log(ee, true); |
return ccs_try_alt_exec(ee); |
|
goto ok; |
|
|
} |
|
1080 |
retval = ccs_find_next_domain(ee); |
retval = ccs_find_next_domain(ee); |
1081 |
if (retval != -EPERM) |
if (retval == -EPERM) { |
1082 |
goto ok; |
if (ccs_find_execute_handler(ee, |
1083 |
if (ccs_find_execute_handler(ee, CCS_TYPE_DENIED_EXECUTE_HANDLER)) { |
CCS_TYPE_DENIED_EXECUTE_HANDLER)) |
1084 |
retval = ccs_try_alt_exec(ee); |
return ccs_try_alt_exec(ee); |
|
if (!retval) |
|
|
ccs_audit_execute_handler_log(ee, false); |
|
1085 |
} |
} |
1086 |
ok: |
if (!retval) |
1087 |
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); |
|
1088 |
return retval; |
return retval; |
1089 |
} |
} |
1090 |
|
|
1092 |
* ccs_finish_execve - Clean up execve() operation. |
* ccs_finish_execve - Clean up execve() operation. |
1093 |
* |
* |
1094 |
* @retval: Return code of an execve() operation. |
* @retval: Return code of an execve() operation. |
1095 |
|
* @ee: Pointer to "struct ccs_execve". |
1096 |
* |
* |
1097 |
* Caller holds ccs_read_lock(). |
* Caller holds ccs_read_lock(). |
1098 |
*/ |
*/ |
1099 |
void ccs_finish_execve(int retval) |
static void ccs_finish_execve(int retval, struct ccs_execve *ee) |
1100 |
{ |
{ |
1101 |
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; |
|
1102 |
if (!ee) |
if (!ee) |
1103 |
return; |
return; |
1104 |
if (retval < 0) |
if (retval < 0) { |
1105 |
goto out; |
task->ccs_domain_info = ee->previous_domain; |
1106 |
/* Proceed to next domain if execution suceeded. */ |
/* |
1107 |
task->ccs_domain_info = ee->r.domain; |
* Make task->ccs_domain_info visible to GC before changing |
1108 |
/* Mark the current process as execute handler. */ |
* task->ccs_flags . |
1109 |
if (ee->handler) |
*/ |
1110 |
task->ccs_flags |= CCS_TASK_IS_EXECUTE_HANDLER; |
smp_mb(); |
1111 |
/* Mark the current process as normal process. */ |
} else { |
1112 |
else |
/* Mark the current process as execute handler. */ |
1113 |
task->ccs_flags &= ~CCS_TASK_IS_EXECUTE_HANDLER; |
if (ee->handler) |
1114 |
out: |
task->ccs_flags |= CCS_TASK_IS_EXECUTE_HANDLER; |
1115 |
ccs_free_execve_entry(ee); |
/* Mark the current process as normal process. */ |
1116 |
|
else |
1117 |
|
task->ccs_flags &= ~CCS_TASK_IS_EXECUTE_HANDLER; |
1118 |
|
} |
1119 |
|
/* Tell GC that I finished execve(). */ |
1120 |
|
task->ccs_flags &= ~CCS_TASK_IS_IN_EXECVE; |
1121 |
|
ccs_read_unlock(ee->reader_idx); |
1122 |
|
kfree(ee->handler_path); |
1123 |
|
kfree(ee->tmp); |
1124 |
|
kfree(ee->dump.data); |
1125 |
|
kfree(ee); |
1126 |
|
} |
1127 |
|
|
1128 |
|
static int __ccs_search_binary_handler(struct linux_binprm *bprm, |
1129 |
|
struct pt_regs *regs) |
1130 |
|
{ |
1131 |
|
struct ccs_execve *ee; |
1132 |
|
int retval; |
1133 |
|
if (!ccs_policy_loaded) |
1134 |
|
ccsecurity_exports.load_policy(bprm->filename); |
1135 |
|
retval = ccs_start_execve(bprm, &ee); |
1136 |
|
if (!retval) |
1137 |
|
retval = search_binary_handler(bprm, regs); |
1138 |
|
ccs_finish_execve(retval, ee); |
1139 |
|
return retval; |
1140 |
|
} |
1141 |
|
|
1142 |
|
void __init ccs_domain_init(void) |
1143 |
|
{ |
1144 |
|
ccsecurity_ops.search_binary_handler = __ccs_search_binary_handler; |
1145 |
} |
} |