| 3 |
* |
* |
| 4 |
* Implementation of the Domain-Based Mandatory Access Control. |
* Implementation of the Domain-Based Mandatory Access Control. |
| 5 |
* |
* |
| 6 |
* Copyright (C) 2005-2007 NTT DATA CORPORATION |
* Copyright (C) 2005-2009 NTT DATA CORPORATION |
| 7 |
* |
* |
| 8 |
* Version: 1.3.2 2007/02/14 |
* Version: 1.7.0-pre 2009/07/03 |
| 9 |
* |
* |
| 10 |
* 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. |
| 11 |
* See README.ccs for ChangeLog. |
* See README.ccs for ChangeLog. |
| 12 |
* |
* |
| 13 |
*/ |
*/ |
|
/***** TOMOYO Linux start. *****/ |
|
| 14 |
|
|
| 15 |
|
#include <linux/slab.h> |
| 16 |
|
#include <linux/highmem.h> |
| 17 |
|
#include <linux/version.h> |
| 18 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
| 19 |
|
#include <linux/namei.h> |
| 20 |
|
#include <linux/mount.h> |
| 21 |
|
#endif |
| 22 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30) |
| 23 |
|
#include <linux/fs_struct.h> |
| 24 |
|
#endif |
| 25 |
#include <linux/ccs_common.h> |
#include <linux/ccs_common.h> |
| 26 |
#include <linux/tomoyo.h> |
#include <linux/tomoyo.h> |
|
#include <linux/realpath.h> |
|
|
#include <linux/highmem.h> |
|
|
#include <linux/binfmts.h> |
|
| 27 |
|
|
| 28 |
|
/* For compatibility with older kernels. */ |
| 29 |
#ifndef for_each_process |
#ifndef for_each_process |
| 30 |
#define for_each_process for_each_task |
#define for_each_process for_each_task |
| 31 |
#endif |
#endif |
| 32 |
|
|
| 33 |
/************************* VARIABLES *************************/ |
/* Variables definitions.*/ |
| 34 |
|
|
| 35 |
/* The initial domain. */ |
/* The initial domain. */ |
| 36 |
struct domain_info KERNEL_DOMAIN = { NULL, NULL, NULL, 0, 0, 0 }; |
struct ccs_domain_info ccs_kernel_domain; |
|
|
|
|
/* /sbin/init started? */ |
|
|
extern int sbin_init_started; |
|
|
|
|
|
#ifdef CONFIG_TOMOYO |
|
|
|
|
|
/* Lock for appending domain's ACL. */ |
|
|
DECLARE_MUTEX(domain_acl_lock); |
|
|
|
|
|
/************************* UTILITY FUNCTIONS *************************/ |
|
|
|
|
|
/***** The structure for program files to force domain reconstruction. *****/ |
|
|
|
|
|
typedef struct domain_initializer_entry { |
|
|
struct domain_initializer_entry *next; |
|
|
const struct path_info *domainname; /* This may be NULL */ |
|
|
const struct path_info *program; |
|
|
u8 is_deleted; |
|
|
u8 is_not; |
|
|
u8 is_last_name; |
|
|
u8 is_oldstyle; |
|
|
} DOMAIN_INITIALIZER_ENTRY; |
|
|
|
|
|
/***** The structure for domains to not to transit domains. *****/ |
|
|
|
|
|
typedef struct domain_keeper_entry { |
|
|
struct domain_keeper_entry *next; |
|
|
const struct path_info *domainname; |
|
|
const struct path_info *program; /* This may be NULL */ |
|
|
u8 is_deleted; |
|
|
u8 is_not; |
|
|
u8 is_last_name; |
|
|
} DOMAIN_KEEPER_ENTRY; |
|
| 37 |
|
|
| 38 |
/***** The structure for program files that should be aggregated. *****/ |
/* The list for "struct ccs_domain_info". */ |
| 39 |
|
LIST_HEAD(ccs_domain_list); |
| 40 |
|
|
| 41 |
typedef struct aggregator_entry { |
/** |
| 42 |
struct aggregator_entry *next; |
* ccs_get_last_name - Get last component of a domainname. |
| 43 |
const struct path_info *original_name; |
* |
| 44 |
const struct path_info *aggregated_name; |
* @domain: Pointer to "struct ccs_domain_info". |
| 45 |
int is_deleted; |
* |
| 46 |
} AGGREGATOR_ENTRY; |
* Returns the last component of the domainname. |
| 47 |
|
*/ |
| 48 |
/***** The structure for program files that should be aliased. *****/ |
const char *ccs_get_last_name(const struct ccs_domain_info *domain) |
|
|
|
|
typedef struct alias_entry { |
|
|
struct alias_entry *next; |
|
|
const struct path_info *original_name; |
|
|
const struct path_info *aliased_name; |
|
|
int is_deleted; |
|
|
} ALIAS_ENTRY; |
|
|
|
|
|
/************************* VARIABLES *************************/ |
|
|
|
|
|
/* Domain creation lock. */ |
|
|
static DECLARE_MUTEX(new_domain_assign_lock); |
|
|
|
|
|
/************************* UTILITY FUNCTIONS *************************/ |
|
|
|
|
|
int IsDomainDef(const unsigned char *buffer) |
|
|
{ |
|
|
/* while (*buffer && (*buffer <= ' ' || *buffer >= 127)) buffer++; */ |
|
|
return strncmp(buffer, ROOT_NAME, ROOT_NAME_LEN) == 0; |
|
|
} |
|
|
|
|
|
const char *GetLastName(const struct domain_info *domain) |
|
| 49 |
{ |
{ |
| 50 |
const char *cp0 = domain->domainname->name, *cp1; |
const char *cp0 = domain->domainname->name; |
| 51 |
if ((cp1 = strrchr(cp0, ' ')) != NULL) return cp1 + 1; |
const char *cp1 = strrchr(cp0, ' '); |
| 52 |
|
if (cp1) |
| 53 |
|
return cp1 + 1; |
| 54 |
return cp0; |
return cp0; |
| 55 |
} |
} |
| 56 |
|
|
| 57 |
int ReadSelfDomain(IO_BUFFER *head) |
/** |
| 58 |
|
* ccs_add_domain_acl - Add the given ACL to the given domain. |
| 59 |
|
* |
| 60 |
|
* @domain: Pointer to "struct ccs_domain_info". May be NULL. |
| 61 |
|
* @acl: Pointer to "struct ccs_acl_info". |
| 62 |
|
* |
| 63 |
|
* Returns 0. |
| 64 |
|
*/ |
| 65 |
|
int ccs_add_domain_acl(struct ccs_domain_info *domain, struct ccs_acl_info *acl) |
| 66 |
{ |
{ |
| 67 |
if (!head->read_eof) { |
if (domain) { |
| 68 |
io_printf(head, "%s", current->domain_info->domainname->name); |
if (acl->cond) |
| 69 |
head->read_eof = 1; |
atomic_inc(&acl->cond->users); |
| 70 |
|
list_add_tail_rcu(&acl->list, &domain->acl_info_list); |
| 71 |
|
} else { |
| 72 |
|
acl->type &= ~ACL_DELETED; |
| 73 |
} |
} |
| 74 |
return 0; |
return 0; |
| 75 |
} |
} |
| 76 |
|
|
| 77 |
int AddDomainACL(struct acl_info *ptr, struct domain_info *domain, struct acl_info *new_ptr) |
/** |
| 78 |
|
* ccs_del_domain_acl - Delete the given ACL from the domain. |
| 79 |
|
* |
| 80 |
|
* @acl: Pointer to "struct ccs_acl_info". May be NULL. |
| 81 |
|
* |
| 82 |
|
* Returns 0. |
| 83 |
|
*/ |
| 84 |
|
int ccs_del_domain_acl(struct ccs_acl_info *acl) |
| 85 |
{ |
{ |
| 86 |
mb(); /* Instead of using spinlock. */ |
if (acl) |
| 87 |
if (!ptr) domain->first_acl_ptr = (struct acl_info *) new_ptr; |
acl->type |= ACL_DELETED; |
|
else ptr->next = (struct acl_info *) new_ptr; |
|
|
UpdateCounter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
|
| 88 |
return 0; |
return 0; |
| 89 |
} |
} |
| 90 |
|
|
| 91 |
int DelDomainACL(struct acl_info *ptr) |
/** |
| 92 |
|
* ccs_audit_execute_handler_log - Audit execute_handler log. |
| 93 |
|
* |
| 94 |
|
* @ee: Pointer to "struct ccs_execve_entry". |
| 95 |
|
* @is_default: True if it is "execute_handler" log. |
| 96 |
|
* |
| 97 |
|
* Returns 0 on success, negative value otherwise. |
| 98 |
|
*/ |
| 99 |
|
static int ccs_audit_execute_handler_log(struct ccs_execve_entry *ee, |
| 100 |
|
const bool is_default) |
| 101 |
{ |
{ |
| 102 |
ptr->is_deleted = 1; |
struct ccs_request_info *r = &ee->r; |
| 103 |
UpdateCounter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
const char *handler = ee->handler->name; |
| 104 |
return 0; |
r->mode = ccs_check_flags(r->domain, CCS_MAC_FOR_FILE); |
| 105 |
|
return ccs_write_audit_log(true, r, "%s %s\n", |
| 106 |
|
is_default ? KEYWORD_EXECUTE_HANDLER : |
| 107 |
|
KEYWORD_DENIED_EXECUTE_HANDLER, handler); |
| 108 |
} |
} |
| 109 |
|
|
| 110 |
int TooManyDomainACL(struct domain_info * const domain) { |
/** |
| 111 |
unsigned int count = 0; |
* ccs_audit_domain_creation_log - Audit domain creation log. |
| 112 |
struct acl_info *ptr; |
* |
| 113 |
for (ptr = domain->first_acl_ptr; ptr; ptr = ptr->next) { |
* @domain: Pointer to "struct ccs_domain_info". |
| 114 |
if (!ptr->is_deleted) count++; |
* |
| 115 |
} |
* Returns 0 on success, negative value otherwise. |
| 116 |
/* If there are so many entries, don't append if accept mode. */ |
*/ |
| 117 |
if (count < CheckCCSFlags(CCS_TOMOYO_MAX_ACCEPT_ENTRY)) return 0; |
static int ccs_audit_domain_creation_log(struct ccs_domain_info *domain) |
| 118 |
if (!domain->quota_warned) { |
{ |
| 119 |
printk("TOMOYO-WARNING: Domain '%s' has so many ACLs to hold. Stopped auto-append mode.\n", domain->domainname->name); |
int error; |
| 120 |
domain->quota_warned = 1; |
struct ccs_request_info r; |
| 121 |
} |
ccs_init_request_info(&r, domain, CCS_MAC_FOR_FILE); |
| 122 |
return 1; |
error = ccs_write_audit_log(false, &r, "use_profile %u\n", r.profile); |
| 123 |
|
return error; |
| 124 |
} |
} |
| 125 |
|
|
| 126 |
|
/* The list for "struct ccs_domain_initializer_entry". */ |
| 127 |
|
LIST_HEAD(ccs_domain_initializer_list); |
| 128 |
|
|
| 129 |
/************************* DOMAIN INITIALIZER HANDLER *************************/ |
/** |
| 130 |
|
* ccs_update_domain_initializer_entry - Update "struct ccs_domain_initializer_entry" list. |
| 131 |
static DOMAIN_INITIALIZER_ENTRY *domain_initializer_list = NULL; |
* |
| 132 |
|
* @domainname: The name of domain. May be NULL. |
| 133 |
static int AddDomainInitializerEntry(const char *domainname, const char *program, const int is_not, const int is_delete, const int is_oldstyle) |
* @program: The name of program. |
| 134 |
{ |
* @is_not: True if it is "no_initialize_domain" entry. |
| 135 |
DOMAIN_INITIALIZER_ENTRY *new_entry, *ptr; |
* @is_delete: True if it is a delete request. |
| 136 |
static DECLARE_MUTEX(lock); |
* |
| 137 |
const struct path_info *saved_program, *saved_domainname = NULL; |
* Returns 0 on success, negative value otherwise. |
| 138 |
int error = -ENOMEM; |
*/ |
| 139 |
int is_last_name = 0; |
static int ccs_update_domain_initializer_entry(const char *domainname, |
| 140 |
if (!IsCorrectPath(program, 1, -1, -1, __FUNCTION__)) return -EINVAL; /* No patterns allowed. */ |
const char *program, |
| 141 |
|
const bool is_not, |
| 142 |
|
const bool is_delete) |
| 143 |
|
{ |
| 144 |
|
struct ccs_domain_initializer_entry *entry = NULL; |
| 145 |
|
struct ccs_domain_initializer_entry *ptr; |
| 146 |
|
const struct ccs_path_info *saved_program; |
| 147 |
|
const struct ccs_path_info *saved_domainname = NULL; |
| 148 |
|
int error = is_delete ? -ENOENT : -ENOMEM; |
| 149 |
|
bool is_last_name = false; |
| 150 |
|
if (!ccs_is_correct_path(program, 1, -1, -1)) |
| 151 |
|
return -EINVAL; /* No patterns allowed. */ |
| 152 |
if (domainname) { |
if (domainname) { |
| 153 |
if (!IsDomainDef(domainname) && IsCorrectPath(domainname, 1, -1, -1, __FUNCTION__)) { |
if (!ccs_is_domain_def(domainname) && |
| 154 |
is_last_name = 1; |
ccs_is_correct_path(domainname, 1, -1, -1)) |
| 155 |
} else if (!IsCorrectDomain(domainname, __FUNCTION__)) { |
is_last_name = true; |
| 156 |
|
else if (!ccs_is_correct_domain(domainname)) |
| 157 |
return -EINVAL; |
return -EINVAL; |
| 158 |
} |
saved_domainname = ccs_get_name(domainname); |
| 159 |
if ((saved_domainname = SaveName(domainname)) == NULL) return -ENOMEM; |
if (!saved_domainname) |
| 160 |
} |
return -ENOMEM; |
| 161 |
if ((saved_program = SaveName(program)) == NULL) return -ENOMEM; |
} |
| 162 |
down(&lock); |
saved_program = ccs_get_name(program); |
| 163 |
for (ptr = domain_initializer_list; ptr; ptr = ptr->next) { |
if (!saved_program) { |
| 164 |
if (ptr->is_not == is_not && ptr->is_oldstyle == is_oldstyle && ptr->domainname == saved_domainname && ptr->program == saved_program) { |
ccs_put_name(saved_domainname); |
| 165 |
ptr->is_deleted = is_delete; |
return -ENOMEM; |
| 166 |
error = 0; |
} |
| 167 |
goto out; |
if (!is_delete) |
| 168 |
} |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
| 169 |
} |
mutex_lock(&ccs_policy_lock); |
| 170 |
if (is_delete) { |
list_for_each_entry_rcu(ptr, &ccs_domain_initializer_list, list) { |
| 171 |
error = -ENOENT; |
if (ptr->is_not != is_not || |
| 172 |
goto out; |
ptr->domainname != saved_domainname || |
| 173 |
} |
ptr->program != saved_program) |
| 174 |
if ((new_entry = (DOMAIN_INITIALIZER_ENTRY *) alloc_element(sizeof(DOMAIN_INITIALIZER_ENTRY))) == NULL) goto out; |
continue; |
| 175 |
new_entry->domainname = saved_domainname; |
ptr->is_deleted = is_delete; |
| 176 |
new_entry->program = saved_program; |
error = 0; |
| 177 |
new_entry->is_not = is_not; |
break; |
|
new_entry->is_last_name = is_last_name; |
|
|
new_entry->is_oldstyle = is_oldstyle; |
|
|
mb(); /* Instead of using spinlock. */ |
|
|
if ((ptr = domain_initializer_list) != NULL) { |
|
|
while (ptr->next) ptr = ptr->next; ptr->next = new_entry; |
|
|
} else { |
|
|
domain_initializer_list = new_entry; |
|
| 178 |
} |
} |
| 179 |
error = 0; |
if (!is_delete && error && ccs_memory_ok(entry, sizeof(*entry))) { |
| 180 |
out: |
entry->domainname = saved_domainname; |
| 181 |
up(&lock); |
saved_domainname = NULL; |
| 182 |
|
entry->program = saved_program; |
| 183 |
|
saved_program = NULL; |
| 184 |
|
entry->is_not = is_not; |
| 185 |
|
entry->is_last_name = is_last_name; |
| 186 |
|
list_add_tail_rcu(&entry->list, &ccs_domain_initializer_list); |
| 187 |
|
entry = NULL; |
| 188 |
|
error = 0; |
| 189 |
|
} |
| 190 |
|
mutex_unlock(&ccs_policy_lock); |
| 191 |
|
ccs_put_name(saved_domainname); |
| 192 |
|
ccs_put_name(saved_program); |
| 193 |
|
kfree(entry); |
| 194 |
return error; |
return error; |
| 195 |
} |
} |
| 196 |
|
|
| 197 |
int ReadDomainInitializerPolicy(IO_BUFFER *head) |
/** |
| 198 |
|
* ccs_read_domain_initializer_policy - Read "struct ccs_domain_initializer_entry" list. |
| 199 |
|
* |
| 200 |
|
* @head: Pointer to "struct ccs_io_buffer". |
| 201 |
|
* |
| 202 |
|
* Returns true on success, false otherwise. |
| 203 |
|
* |
| 204 |
|
* Caller holds ccs_read_lock(). |
| 205 |
|
*/ |
| 206 |
|
bool ccs_read_domain_initializer_policy(struct ccs_io_buffer *head) |
| 207 |
{ |
{ |
| 208 |
DOMAIN_INITIALIZER_ENTRY *ptr = (DOMAIN_INITIALIZER_ENTRY *) head->read_var2; |
struct list_head *pos; |
| 209 |
if (!ptr) ptr = domain_initializer_list; |
bool done = true; |
| 210 |
while (ptr) { |
ccs_check_read_lock(); |
| 211 |
head->read_var2 = (void *) ptr; |
list_for_each_cookie(pos, head->read_var2, |
| 212 |
if (!ptr->is_deleted) { |
&ccs_domain_initializer_list) { |
| 213 |
if (ptr->domainname) { |
const char *no; |
| 214 |
if (io_printf(head, "%s%s%s from %s\n", ptr->is_not ? "no_" : "", ptr->is_oldstyle ? KEYWORD_INITIALIZER : KEYWORD_INITIALIZE_DOMAIN, ptr->program->name, ptr->domainname->name)) break; |
const char *from = ""; |
| 215 |
} else { |
const char *domain = ""; |
| 216 |
if (io_printf(head, "%s%s%s\n", ptr->is_not ? "no_" : "", ptr->is_oldstyle ? KEYWORD_INITIALIZER : KEYWORD_INITIALIZE_DOMAIN, ptr->program->name)) break; |
struct ccs_domain_initializer_entry *ptr; |
| 217 |
} |
ptr = list_entry(pos, struct ccs_domain_initializer_entry, |
| 218 |
|
list); |
| 219 |
|
if (ptr->is_deleted) |
| 220 |
|
continue; |
| 221 |
|
no = ptr->is_not ? "no_" : ""; |
| 222 |
|
if (ptr->domainname) { |
| 223 |
|
from = " from "; |
| 224 |
|
domain = ptr->domainname->name; |
| 225 |
} |
} |
| 226 |
ptr = ptr->next; |
done = ccs_io_printf(head, |
| 227 |
|
"%s" KEYWORD_INITIALIZE_DOMAIN "%s%s%s\n", |
| 228 |
|
no, ptr->program->name, from, domain); |
| 229 |
|
if (!done) |
| 230 |
|
break; |
| 231 |
} |
} |
| 232 |
return ptr ? -ENOMEM : 0; |
return done; |
| 233 |
} |
} |
| 234 |
|
|
| 235 |
int AddDomainInitializerPolicy(char *data, const int is_not, const int is_delete, const int is_oldstyle) |
/** |
| 236 |
|
* ccs_write_domain_initializer_policy - Write "struct ccs_domain_initializer_entry" list. |
| 237 |
|
* |
| 238 |
|
* @data: String to parse. |
| 239 |
|
* @is_not: True if it is "no_initialize_domain" entry. |
| 240 |
|
* @is_delete: True if it is a delete request. |
| 241 |
|
* |
| 242 |
|
* Returns 0 on success, negative value otherwise. |
| 243 |
|
*/ |
| 244 |
|
int ccs_write_domain_initializer_policy(char *data, const bool is_not, |
| 245 |
|
const bool is_delete) |
| 246 |
{ |
{ |
| 247 |
char *cp = strstr(data, " from "); |
char *cp = strstr(data, " from "); |
| 248 |
if (cp) { |
if (cp) { |
| 249 |
*cp = '\0'; |
*cp = '\0'; |
| 250 |
return AddDomainInitializerEntry(cp + 6, data, is_not, is_delete, is_oldstyle); |
return ccs_update_domain_initializer_entry(cp + 6, data, |
| 251 |
} else { |
is_not, is_delete); |
|
return AddDomainInitializerEntry(NULL, data, is_not, is_delete, is_oldstyle); |
|
| 252 |
} |
} |
| 253 |
|
return ccs_update_domain_initializer_entry(NULL, data, is_not, |
| 254 |
|
is_delete); |
| 255 |
} |
} |
| 256 |
|
|
| 257 |
static int IsDomainInitializer(const struct path_info *domainname, const struct path_info *program, const struct path_info *last_name) |
/** |
| 258 |
{ |
* ccs_is_domain_initializer - Check whether the given program causes domainname reinitialization. |
| 259 |
DOMAIN_INITIALIZER_ENTRY *ptr; |
* |
| 260 |
int flag = 0; |
* @domainname: The name of domain. |
| 261 |
for (ptr = domain_initializer_list; ptr; ptr = ptr->next) { |
* @program: The name of program. |
| 262 |
if (ptr->is_deleted ) continue; |
* @last_name: The last component of @domainname. |
| 263 |
|
* |
| 264 |
|
* Returns true if executing @program reinitializes domain transition, |
| 265 |
|
* false otherwise. |
| 266 |
|
* |
| 267 |
|
* Caller holds ccs_read_lock(). |
| 268 |
|
*/ |
| 269 |
|
static bool ccs_is_domain_initializer(const struct ccs_path_info *domainname, |
| 270 |
|
const struct ccs_path_info *program, |
| 271 |
|
const struct ccs_path_info *last_name) |
| 272 |
|
{ |
| 273 |
|
struct ccs_domain_initializer_entry *ptr; |
| 274 |
|
bool flag = false; |
| 275 |
|
ccs_check_read_lock(); |
| 276 |
|
list_for_each_entry_rcu(ptr, &ccs_domain_initializer_list, list) { |
| 277 |
|
if (ptr->is_deleted) |
| 278 |
|
continue; |
| 279 |
if (ptr->domainname) { |
if (ptr->domainname) { |
| 280 |
if (!ptr->is_last_name) { |
if (!ptr->is_last_name) { |
| 281 |
if (ptr->domainname != domainname) continue; |
if (ptr->domainname != domainname) |
| 282 |
|
continue; |
| 283 |
} else { |
} else { |
| 284 |
if (pathcmp(ptr->domainname, last_name)) continue; |
if (ccs_pathcmp(ptr->domainname, last_name)) |
| 285 |
|
continue; |
| 286 |
} |
} |
| 287 |
} |
} |
| 288 |
if (pathcmp(ptr->program, program)) continue; |
if (ccs_pathcmp(ptr->program, program)) |
| 289 |
if (ptr->is_not) return 0; |
continue; |
| 290 |
flag = 1; |
if (ptr->is_not) { |
| 291 |
|
flag = false; |
| 292 |
|
break; |
| 293 |
|
} |
| 294 |
|
flag = true; |
| 295 |
} |
} |
| 296 |
return flag; |
return flag; |
| 297 |
} |
} |
| 298 |
|
|
| 299 |
/************************* DOMAIN KEEPER HANDLER *************************/ |
/* The list for "struct ccs_domain_keeper_entry". */ |
| 300 |
|
LIST_HEAD(ccs_domain_keeper_list); |
|
static DOMAIN_KEEPER_ENTRY *domain_keeper_list = NULL; |
|
| 301 |
|
|
| 302 |
static int AddDomainKeeperEntry(const char *domainname, const char *program, const int is_not, const int is_delete) |
/** |
| 303 |
{ |
* ccs_update_domain_keeper_entry - Update "struct ccs_domain_keeper_entry" list. |
| 304 |
DOMAIN_KEEPER_ENTRY *new_entry, *ptr; |
* |
| 305 |
const struct path_info *saved_domainname, *saved_program = NULL; |
* @domainname: The name of domain. |
| 306 |
static DECLARE_MUTEX(lock); |
* @program: The name of program. May be NULL. |
| 307 |
int error = -ENOMEM; |
* @is_not: True if it is "no_keep_domain" entry. |
| 308 |
int is_last_name = 0; |
* @is_delete: True if it is a delete request. |
| 309 |
if (!IsDomainDef(domainname) && IsCorrectPath(domainname, 1, -1, -1, __FUNCTION__)) { |
* |
| 310 |
is_last_name = 1; |
* Returns 0 on success, negative value otherwise. |
| 311 |
} else if (!IsCorrectDomain(domainname, __FUNCTION__)) { |
*/ |
| 312 |
|
static int ccs_update_domain_keeper_entry(const char *domainname, |
| 313 |
|
const char *program, |
| 314 |
|
const bool is_not, |
| 315 |
|
const bool is_delete) |
| 316 |
|
{ |
| 317 |
|
struct ccs_domain_keeper_entry *entry = NULL; |
| 318 |
|
struct ccs_domain_keeper_entry *ptr; |
| 319 |
|
const struct ccs_path_info *saved_domainname; |
| 320 |
|
const struct ccs_path_info *saved_program = NULL; |
| 321 |
|
int error = is_delete ? -ENOENT : -ENOMEM; |
| 322 |
|
bool is_last_name = false; |
| 323 |
|
if (!ccs_is_domain_def(domainname) && |
| 324 |
|
ccs_is_correct_path(domainname, 1, -1, -1)) |
| 325 |
|
is_last_name = true; |
| 326 |
|
else if (!ccs_is_correct_domain(domainname)) |
| 327 |
return -EINVAL; |
return -EINVAL; |
|
} |
|
| 328 |
if (program) { |
if (program) { |
| 329 |
if (!IsCorrectPath(program, 1, -1, -1, __FUNCTION__)) return -EINVAL; |
if (!ccs_is_correct_path(program, 1, -1, -1)) |
| 330 |
if ((saved_program = SaveName(program)) == NULL) return -ENOMEM; |
return -EINVAL; |
| 331 |
} |
saved_program = ccs_get_name(program); |
| 332 |
if ((saved_domainname = SaveName(domainname)) == NULL) return -ENOMEM; |
if (!saved_program) |
| 333 |
down(&lock); |
return -ENOMEM; |
| 334 |
for (ptr = domain_keeper_list; ptr; ptr = ptr->next) { |
} |
| 335 |
if (ptr->is_not == is_not && ptr->domainname == saved_domainname && ptr->program == saved_program) { |
saved_domainname = ccs_get_name(domainname); |
| 336 |
ptr->is_deleted = is_delete; |
if (!saved_domainname) { |
| 337 |
error = 0; |
ccs_put_name(saved_program); |
| 338 |
goto out; |
return -ENOMEM; |
| 339 |
} |
} |
| 340 |
} |
if (!is_delete) |
| 341 |
if (is_delete) { |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
| 342 |
error = -ENOENT; |
mutex_lock(&ccs_policy_lock); |
| 343 |
goto out; |
list_for_each_entry_rcu(ptr, &ccs_domain_keeper_list, list) { |
| 344 |
} |
if (ptr->is_not != is_not || |
| 345 |
if ((new_entry = (DOMAIN_KEEPER_ENTRY *) alloc_element(sizeof(DOMAIN_KEEPER_ENTRY))) == NULL) goto out; |
ptr->domainname != saved_domainname || |
| 346 |
new_entry->domainname = saved_domainname; |
ptr->program != saved_program) |
| 347 |
new_entry->program = saved_program; |
continue; |
| 348 |
new_entry->is_not = is_not; |
ptr->is_deleted = is_delete; |
| 349 |
new_entry->is_last_name = is_last_name; |
error = 0; |
| 350 |
mb(); /* Instead of using spinlock. */ |
break; |
|
if ((ptr = domain_keeper_list) != NULL) { |
|
|
while (ptr->next) ptr = ptr->next; ptr->next = new_entry; |
|
|
} else { |
|
|
domain_keeper_list = new_entry; |
|
| 351 |
} |
} |
| 352 |
error = 0; |
if (!is_delete && error && ccs_memory_ok(entry, sizeof(*entry))) { |
| 353 |
out: |
entry->domainname = saved_domainname; |
| 354 |
up(&lock); |
saved_domainname = NULL; |
| 355 |
|
entry->program = saved_program; |
| 356 |
|
saved_program = NULL; |
| 357 |
|
entry->is_not = is_not; |
| 358 |
|
entry->is_last_name = is_last_name; |
| 359 |
|
list_add_tail_rcu(&entry->list, &ccs_domain_keeper_list); |
| 360 |
|
entry = NULL; |
| 361 |
|
error = 0; |
| 362 |
|
} |
| 363 |
|
mutex_unlock(&ccs_policy_lock); |
| 364 |
|
ccs_put_name(saved_domainname); |
| 365 |
|
ccs_put_name(saved_program); |
| 366 |
|
kfree(entry); |
| 367 |
return error; |
return error; |
| 368 |
} |
} |
| 369 |
|
|
| 370 |
int AddDomainKeeperPolicy(char *data, const int is_not, const int is_delete) |
/** |
| 371 |
|
* ccs_write_domain_keeper_policy - Write "struct ccs_domain_keeper_entry" list. |
| 372 |
|
* |
| 373 |
|
* @data: String to parse. |
| 374 |
|
* @is_not: True if it is "no_keep_domain" entry. |
| 375 |
|
* @is_delete: True if it is a delete request. |
| 376 |
|
* |
| 377 |
|
*/ |
| 378 |
|
int ccs_write_domain_keeper_policy(char *data, const bool is_not, |
| 379 |
|
const bool is_delete) |
| 380 |
{ |
{ |
| 381 |
char *cp = strstr(data, " from "); |
char *cp = strstr(data, " from "); |
| 382 |
if (cp) { |
if (cp) { |
| 383 |
*cp = '\0'; |
*cp = '\0'; |
| 384 |
return AddDomainKeeperEntry(cp + 6, data, is_not, is_delete); |
return ccs_update_domain_keeper_entry(cp + 6, data, |
| 385 |
} else { |
is_not, is_delete); |
|
return AddDomainKeeperEntry(data, NULL, is_not, is_delete); |
|
| 386 |
} |
} |
| 387 |
|
return ccs_update_domain_keeper_entry(data, NULL, is_not, is_delete); |
| 388 |
} |
} |
| 389 |
|
|
| 390 |
int ReadDomainKeeperPolicy(IO_BUFFER *head) |
/** |
| 391 |
|
* ccs_read_domain_keeper_policy - Read "struct ccs_domain_keeper_entry" list. |
| 392 |
|
* |
| 393 |
|
* @head: Pointer to "struct ccs_io_buffer". |
| 394 |
|
* |
| 395 |
|
* Returns true on success, false otherwise. |
| 396 |
|
* |
| 397 |
|
* Caller holds ccs_read_lock(). |
| 398 |
|
*/ |
| 399 |
|
bool ccs_read_domain_keeper_policy(struct ccs_io_buffer *head) |
| 400 |
{ |
{ |
| 401 |
DOMAIN_KEEPER_ENTRY *ptr = (DOMAIN_KEEPER_ENTRY *) head->read_var2; |
struct list_head *pos; |
| 402 |
if (!ptr) ptr = domain_keeper_list; |
bool done = true; |
| 403 |
while (ptr) { |
ccs_check_read_lock(); |
| 404 |
head->read_var2 = (void *) ptr; |
list_for_each_cookie(pos, head->read_var2, |
| 405 |
if (!ptr->is_deleted) { |
&ccs_domain_keeper_list) { |
| 406 |
if (ptr->program) { |
struct ccs_domain_keeper_entry *ptr; |
| 407 |
if (io_printf(head, "%s" KEYWORD_KEEP_DOMAIN "%s from %s\n", ptr->is_not ? "no_" : "", ptr->program->name, ptr->domainname->name)) break; |
const char *no; |
| 408 |
} else { |
const char *from = ""; |
| 409 |
if (io_printf(head, "%s" KEYWORD_KEEP_DOMAIN "%s\n", ptr->is_not ? "no_" : "", ptr->domainname->name)) break; |
const char *program = ""; |
| 410 |
} |
ptr = list_entry(pos, struct ccs_domain_keeper_entry, list); |
| 411 |
|
if (ptr->is_deleted) |
| 412 |
|
continue; |
| 413 |
|
no = ptr->is_not ? "no_" : ""; |
| 414 |
|
if (ptr->program) { |
| 415 |
|
from = " from "; |
| 416 |
|
program = ptr->program->name; |
| 417 |
} |
} |
| 418 |
ptr = ptr->next; |
done = ccs_io_printf(head, |
| 419 |
|
"%s" KEYWORD_KEEP_DOMAIN "%s%s%s\n", no, |
| 420 |
|
program, from, ptr->domainname->name); |
| 421 |
|
if (!done) |
| 422 |
|
break; |
| 423 |
} |
} |
| 424 |
return ptr ? -ENOMEM : 0; |
return done; |
| 425 |
} |
} |
| 426 |
|
|
| 427 |
static int IsDomainKeeper(const struct path_info *domainname, const struct path_info *program, const struct path_info *last_name) |
/** |
| 428 |
{ |
* ccs_is_domain_keeper - Check whether the given program causes domain transition suppression. |
| 429 |
DOMAIN_KEEPER_ENTRY *ptr; |
* |
| 430 |
int flag = 0; |
* @domainname: The name of domain. |
| 431 |
for (ptr = domain_keeper_list; ptr; ptr = ptr->next) { |
* @program: The name of program. |
| 432 |
if (ptr->is_deleted) continue; |
* @last_name: The last component of @domainname. |
| 433 |
|
* |
| 434 |
|
* Returns true if executing @program supresses domain transition, |
| 435 |
|
* false otherwise. |
| 436 |
|
* |
| 437 |
|
* Caller holds ccs_read_lock(). |
| 438 |
|
*/ |
| 439 |
|
static bool ccs_is_domain_keeper(const struct ccs_path_info *domainname, |
| 440 |
|
const struct ccs_path_info *program, |
| 441 |
|
const struct ccs_path_info *last_name) |
| 442 |
|
{ |
| 443 |
|
struct ccs_domain_keeper_entry *ptr; |
| 444 |
|
bool flag = false; |
| 445 |
|
ccs_check_read_lock(); |
| 446 |
|
list_for_each_entry_rcu(ptr, &ccs_domain_keeper_list, list) { |
| 447 |
|
if (ptr->is_deleted) |
| 448 |
|
continue; |
| 449 |
if (!ptr->is_last_name) { |
if (!ptr->is_last_name) { |
| 450 |
if (ptr->domainname != domainname) continue; |
if (ptr->domainname != domainname) |
| 451 |
|
continue; |
| 452 |
} else { |
} else { |
| 453 |
if (pathcmp(ptr->domainname, last_name)) continue; |
if (ccs_pathcmp(ptr->domainname, last_name)) |
| 454 |
|
continue; |
| 455 |
} |
} |
| 456 |
if (ptr->program && pathcmp(ptr->program, program)) continue; |
if (ptr->program && ccs_pathcmp(ptr->program, program)) |
| 457 |
if (ptr->is_not) return 0; |
continue; |
| 458 |
flag = 1; |
if (ptr->is_not) { |
| 459 |
|
flag = false; |
| 460 |
|
break; |
| 461 |
|
} |
| 462 |
|
flag = true; |
| 463 |
} |
} |
| 464 |
return flag; |
return flag; |
| 465 |
} |
} |
| 466 |
|
|
| 467 |
/************************* SYMBOLIC LINKED PROGRAM HANDLER *************************/ |
/* The list for "struct ccs_aggregator_entry". */ |
| 468 |
|
LIST_HEAD(ccs_aggregator_list); |
| 469 |
|
|
| 470 |
static ALIAS_ENTRY *alias_list = NULL; |
/** |
| 471 |
|
* ccs_update_aggregator_entry - Update "struct ccs_aggregator_entry" list. |
| 472 |
|
* |
| 473 |
|
* @original_name: The original program's name. |
| 474 |
|
* @aggregated_name: The aggregated program's name. |
| 475 |
|
* @is_delete: True if it is a delete request. |
| 476 |
|
* |
| 477 |
|
* Returns 0 on success, negative value otherwise. |
| 478 |
|
*/ |
| 479 |
|
static int ccs_update_aggregator_entry(const char *original_name, |
| 480 |
|
const char *aggregated_name, |
| 481 |
|
const bool is_delete) |
| 482 |
|
{ |
| 483 |
|
struct ccs_aggregator_entry *entry = NULL; |
| 484 |
|
struct ccs_aggregator_entry *ptr; |
| 485 |
|
const struct ccs_path_info *saved_original_name; |
| 486 |
|
const struct ccs_path_info *saved_aggregated_name; |
| 487 |
|
int error = is_delete ? -ENOENT : -ENOMEM; |
| 488 |
|
if (!ccs_is_correct_path(original_name, 1, 0, -1) || |
| 489 |
|
!ccs_is_correct_path(aggregated_name, 1, -1, -1)) |
| 490 |
|
return -EINVAL; |
| 491 |
|
saved_original_name = ccs_get_name(original_name); |
| 492 |
|
saved_aggregated_name = ccs_get_name(aggregated_name); |
| 493 |
|
if (!saved_original_name || !saved_aggregated_name) { |
| 494 |
|
ccs_put_name(saved_original_name); |
| 495 |
|
ccs_put_name(saved_aggregated_name); |
| 496 |
|
return -ENOMEM; |
| 497 |
|
} |
| 498 |
|
if (!is_delete) |
| 499 |
|
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
| 500 |
|
mutex_lock(&ccs_policy_lock); |
| 501 |
|
list_for_each_entry_rcu(ptr, &ccs_aggregator_list, list) { |
| 502 |
|
if (ptr->original_name != saved_original_name || |
| 503 |
|
ptr->aggregated_name != saved_aggregated_name) |
| 504 |
|
continue; |
| 505 |
|
ptr->is_deleted = is_delete; |
| 506 |
|
error = 0; |
| 507 |
|
break; |
| 508 |
|
} |
| 509 |
|
if (!is_delete && error && ccs_memory_ok(entry, sizeof(*entry))) { |
| 510 |
|
entry->original_name = saved_original_name; |
| 511 |
|
saved_original_name = NULL; |
| 512 |
|
entry->aggregated_name = saved_aggregated_name; |
| 513 |
|
saved_aggregated_name = NULL; |
| 514 |
|
list_add_tail_rcu(&entry->list, &ccs_aggregator_list); |
| 515 |
|
entry = NULL; |
| 516 |
|
error = 0; |
| 517 |
|
} |
| 518 |
|
mutex_unlock(&ccs_policy_lock); |
| 519 |
|
ccs_put_name(saved_original_name); |
| 520 |
|
ccs_put_name(saved_aggregated_name); |
| 521 |
|
kfree(entry); |
| 522 |
|
return error; |
| 523 |
|
} |
| 524 |
|
|
| 525 |
static int AddAliasEntry(const char *original_name, const char *aliased_name, const int is_delete) |
/** |
| 526 |
|
* ccs_read_aggregator_policy - Read "struct ccs_aggregator_entry" list. |
| 527 |
|
* |
| 528 |
|
* @head: Pointer to "struct ccs_io_buffer". |
| 529 |
|
* |
| 530 |
|
* Returns true on success, false otherwise. |
| 531 |
|
* |
| 532 |
|
* Caller holds ccs_read_lock(). |
| 533 |
|
*/ |
| 534 |
|
bool ccs_read_aggregator_policy(struct ccs_io_buffer *head) |
| 535 |
{ |
{ |
| 536 |
ALIAS_ENTRY *new_entry, *ptr; |
struct list_head *pos; |
| 537 |
static DECLARE_MUTEX(lock); |
bool done = true; |
| 538 |
const struct path_info *saved_original_name, *saved_aliased_name; |
ccs_check_read_lock(); |
| 539 |
int error = -ENOMEM; |
list_for_each_cookie(pos, head->read_var2, &ccs_aggregator_list) { |
| 540 |
if (!IsCorrectPath(original_name, 1, -1, -1, __FUNCTION__) || !IsCorrectPath(aliased_name, 1, -1, -1, __FUNCTION__)) return -EINVAL; /* No patterns allowed. */ |
struct ccs_aggregator_entry *ptr; |
| 541 |
if ((saved_original_name = SaveName(original_name)) == NULL || (saved_aliased_name = SaveName(aliased_name)) == NULL) return -ENOMEM; |
ptr = list_entry(pos, struct ccs_aggregator_entry, list); |
| 542 |
down(&lock); |
if (ptr->is_deleted) |
| 543 |
for (ptr = alias_list; ptr; ptr = ptr->next) { |
continue; |
| 544 |
if (ptr->original_name == saved_original_name && ptr->aliased_name == saved_aliased_name) { |
done = ccs_io_printf(head, KEYWORD_AGGREGATOR "%s %s\n", |
| 545 |
ptr->is_deleted = is_delete; |
ptr->original_name->name, |
| 546 |
error = 0; |
ptr->aggregated_name->name); |
| 547 |
goto out; |
if (!done) |
| 548 |
} |
break; |
|
} |
|
|
if (is_delete) { |
|
|
error = -ENOENT; |
|
|
goto out; |
|
| 549 |
} |
} |
| 550 |
if ((new_entry = (ALIAS_ENTRY *) alloc_element(sizeof(ALIAS_ENTRY))) == NULL) goto out; |
return done; |
| 551 |
new_entry->original_name = saved_original_name; |
} |
| 552 |
new_entry->aliased_name = saved_aliased_name; |
|
| 553 |
mb(); /* Instead of using spinlock. */ |
/** |
| 554 |
if ((ptr = alias_list) != NULL) { |
* ccs_write_aggregator_policy - Write "struct ccs_aggregator_entry" list. |
| 555 |
while (ptr->next) ptr = ptr->next; ptr->next = new_entry; |
* |
| 556 |
} else { |
* @data: String to parse. |
| 557 |
alias_list = new_entry; |
* @is_delete: True if it is a delete request. |
| 558 |
|
* |
| 559 |
|
* Returns 0 on success, negative value otherwise. |
| 560 |
|
*/ |
| 561 |
|
int ccs_write_aggregator_policy(char *data, const bool is_delete) |
| 562 |
|
{ |
| 563 |
|
char *w[2]; |
| 564 |
|
if (!ccs_tokenize(data, w, sizeof(w)) || !w[1][0]) |
| 565 |
|
return -EINVAL; |
| 566 |
|
return ccs_update_aggregator_entry(w[0], w[1], is_delete); |
| 567 |
|
} |
| 568 |
|
|
| 569 |
|
/* Domain create/delete handler. */ |
| 570 |
|
|
| 571 |
|
/** |
| 572 |
|
* ccs_delete_domain - Delete a domain. |
| 573 |
|
* |
| 574 |
|
* @domainname: The name of domain. |
| 575 |
|
* |
| 576 |
|
* Returns 0. |
| 577 |
|
*/ |
| 578 |
|
int ccs_delete_domain(char *domainname) |
| 579 |
|
{ |
| 580 |
|
struct ccs_domain_info *domain; |
| 581 |
|
struct ccs_path_info name; |
| 582 |
|
name.name = domainname; |
| 583 |
|
ccs_fill_path_info(&name); |
| 584 |
|
mutex_lock(&ccs_policy_lock); |
| 585 |
|
/* Is there an active domain? */ |
| 586 |
|
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
| 587 |
|
/* Never delete ccs_kernel_domain */ |
| 588 |
|
if (domain == &ccs_kernel_domain) |
| 589 |
|
continue; |
| 590 |
|
if (domain->is_deleted || |
| 591 |
|
ccs_pathcmp(domain->domainname, &name)) |
| 592 |
|
continue; |
| 593 |
|
domain->is_deleted = true; |
| 594 |
|
break; |
| 595 |
} |
} |
| 596 |
error = 0; |
mutex_unlock(&ccs_policy_lock); |
| 597 |
out: |
return 0; |
|
up(&lock); |
|
|
return error; |
|
| 598 |
} |
} |
| 599 |
|
|
| 600 |
int ReadAliasPolicy(IO_BUFFER *head) |
/** |
| 601 |
|
* ccs_find_or_assign_new_domain - Create a domain. |
| 602 |
|
* |
| 603 |
|
* @domainname: The name of domain. |
| 604 |
|
* @profile: Profile number to assign if the domain was newly created. |
| 605 |
|
* |
| 606 |
|
* Returns pointer to "struct ccs_domain_info" on success, NULL otherwise. |
| 607 |
|
*/ |
| 608 |
|
struct ccs_domain_info *ccs_find_or_assign_new_domain(const char *domainname, |
| 609 |
|
const u8 profile) |
| 610 |
{ |
{ |
| 611 |
ALIAS_ENTRY *ptr = (ALIAS_ENTRY *) head->read_var2; |
struct ccs_domain_info *entry; |
| 612 |
if (!ptr) ptr = alias_list; |
struct ccs_domain_info *domain; |
| 613 |
while (ptr) { |
const struct ccs_path_info *saved_domainname; |
| 614 |
head->read_var2 = (void *) ptr; |
bool found = false; |
| 615 |
if (!ptr->is_deleted && io_printf(head, KEYWORD_ALIAS "%s %s\n", ptr->original_name->name, ptr->aliased_name->name)) break; |
|
| 616 |
ptr = ptr->next; |
if (!ccs_is_correct_domain(domainname)) |
| 617 |
|
return NULL; |
| 618 |
|
saved_domainname = ccs_get_name(domainname); |
| 619 |
|
if (!saved_domainname) |
| 620 |
|
return NULL; |
| 621 |
|
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
| 622 |
|
mutex_lock(&ccs_policy_lock); |
| 623 |
|
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
| 624 |
|
if (domain->is_deleted || |
| 625 |
|
ccs_pathcmp(saved_domainname, domain->domainname)) |
| 626 |
|
continue; |
| 627 |
|
found = true; |
| 628 |
|
break; |
| 629 |
} |
} |
| 630 |
return ptr ? -ENOMEM : 0; |
if (!found && ccs_memory_ok(entry, sizeof(*entry))) { |
| 631 |
|
INIT_LIST_HEAD(&entry->acl_info_list); |
| 632 |
|
entry->domainname = saved_domainname; |
| 633 |
|
saved_domainname = NULL; |
| 634 |
|
entry->profile = profile; |
| 635 |
|
list_add_tail_rcu(&entry->list, &ccs_domain_list); |
| 636 |
|
domain = entry; |
| 637 |
|
entry = NULL; |
| 638 |
|
found = true; |
| 639 |
|
} |
| 640 |
|
mutex_unlock(&ccs_policy_lock); |
| 641 |
|
ccs_put_name(saved_domainname); |
| 642 |
|
kfree(entry); |
| 643 |
|
return found ? domain : NULL; |
| 644 |
} |
} |
| 645 |
|
|
| 646 |
int AddAliasPolicy(char *data, const int is_delete) |
/** |
| 647 |
|
* ccs_get_argv0 - Get argv[0]. |
| 648 |
|
* |
| 649 |
|
* @ee: Pointer to "struct ccs_execve_entry". |
| 650 |
|
* |
| 651 |
|
* Returns true on success, false otherwise. |
| 652 |
|
*/ |
| 653 |
|
static bool ccs_get_argv0(struct ccs_execve_entry *ee) |
| 654 |
{ |
{ |
| 655 |
char *cp = strchr(data, ' '); |
struct linux_binprm *bprm = ee->bprm; |
| 656 |
if (!cp) return -EINVAL; |
char *arg_ptr = ee->tmp; |
| 657 |
*cp++ = '\0'; |
int arg_len = 0; |
| 658 |
return AddAliasEntry(data, cp, is_delete); |
unsigned long pos = bprm->p; |
| 659 |
|
int offset = pos % PAGE_SIZE; |
| 660 |
|
bool done = false; |
| 661 |
|
if (!bprm->argc) |
| 662 |
|
goto out; |
| 663 |
|
while (1) { |
| 664 |
|
if (!ccs_dump_page(bprm, pos, &ee->dump)) |
| 665 |
|
goto out; |
| 666 |
|
pos += PAGE_SIZE - offset; |
| 667 |
|
/* Read. */ |
| 668 |
|
while (offset < PAGE_SIZE) { |
| 669 |
|
const char *kaddr = ee->dump.data; |
| 670 |
|
const unsigned char c = kaddr[offset++]; |
| 671 |
|
if (c && arg_len < CCS_MAX_PATHNAME_LEN - 10) { |
| 672 |
|
if (c == '\\') { |
| 673 |
|
arg_ptr[arg_len++] = '\\'; |
| 674 |
|
arg_ptr[arg_len++] = '\\'; |
| 675 |
|
} else if (c == '/') { |
| 676 |
|
arg_len = 0; |
| 677 |
|
} else if (c > ' ' && c < 127) { |
| 678 |
|
arg_ptr[arg_len++] = c; |
| 679 |
|
} else { |
| 680 |
|
arg_ptr[arg_len++] = '\\'; |
| 681 |
|
arg_ptr[arg_len++] = (c >> 6) + '0'; |
| 682 |
|
arg_ptr[arg_len++] |
| 683 |
|
= ((c >> 3) & 7) + '0'; |
| 684 |
|
arg_ptr[arg_len++] = (c & 7) + '0'; |
| 685 |
|
} |
| 686 |
|
} else { |
| 687 |
|
arg_ptr[arg_len] = '\0'; |
| 688 |
|
done = true; |
| 689 |
|
break; |
| 690 |
|
} |
| 691 |
|
} |
| 692 |
|
offset = 0; |
| 693 |
|
if (done) |
| 694 |
|
break; |
| 695 |
|
} |
| 696 |
|
return true; |
| 697 |
|
out: |
| 698 |
|
return false; |
| 699 |
} |
} |
| 700 |
|
|
| 701 |
/************************* DOMAIN AGGREGATOR HANDLER *************************/ |
/** |
| 702 |
|
* ccs_find_next_domain - Find a domain. |
| 703 |
|
* |
| 704 |
|
* @ee: Pointer to "struct ccs_execve_entry". |
| 705 |
|
* |
| 706 |
|
* Returns 0 on success, negative value otherwise. |
| 707 |
|
* |
| 708 |
|
* Caller holds ccs_read_lock(). |
| 709 |
|
*/ |
| 710 |
|
static int ccs_find_next_domain(struct ccs_execve_entry *ee) |
| 711 |
|
{ |
| 712 |
|
struct ccs_request_info *r = &ee->r; |
| 713 |
|
const struct ccs_path_info *handler = ee->handler; |
| 714 |
|
struct ccs_domain_info *domain = NULL; |
| 715 |
|
const char *old_domain_name = r->domain->domainname->name; |
| 716 |
|
struct linux_binprm *bprm = ee->bprm; |
| 717 |
|
const u8 mode = r->mode; |
| 718 |
|
const bool is_enforce = (mode == 3); |
| 719 |
|
const u32 ccs_flags = current->ccs_flags; |
| 720 |
|
char *new_domain_name = NULL; |
| 721 |
|
struct ccs_path_info rn; /* real name */ |
| 722 |
|
struct ccs_path_info ln; /* last name */ |
| 723 |
|
int retval; |
| 724 |
|
ccs_check_read_lock(); |
| 725 |
|
retry: |
| 726 |
|
current->ccs_flags = ccs_flags; |
| 727 |
|
r->cond = NULL; |
| 728 |
|
/* Get symlink's pathname of program. */ |
| 729 |
|
retval = ccs_symlink_path(bprm->filename, ee); |
| 730 |
|
if (retval < 0) |
| 731 |
|
goto out; |
| 732 |
|
|
| 733 |
static AGGREGATOR_ENTRY *aggregator_list = NULL; |
rn.name = ee->program_path; |
| 734 |
|
ccs_fill_path_info(&rn); |
| 735 |
|
ln.name = ccs_get_last_name(r->domain); |
| 736 |
|
ccs_fill_path_info(&ln); |
| 737 |
|
|
| 738 |
|
if (handler) { |
| 739 |
|
if (ccs_pathcmp(&rn, handler)) { |
| 740 |
|
/* Failed to verify execute handler. */ |
| 741 |
|
static u8 counter = 20; |
| 742 |
|
if (counter) { |
| 743 |
|
counter--; |
| 744 |
|
printk(KERN_WARNING "Failed to verify: %s\n", |
| 745 |
|
handler->name); |
| 746 |
|
} |
| 747 |
|
goto out; |
| 748 |
|
} |
| 749 |
|
goto calculate_domain; |
| 750 |
|
} |
| 751 |
|
|
| 752 |
static int AddAggregatorEntry(const char *original_name, const char *aggregated_name, const int is_delete) |
/* Compare basename of program_path and argv[0] */ |
| 753 |
{ |
r->mode = ccs_check_flags(r->domain, CCS_MAC_FOR_ARGV0); |
| 754 |
AGGREGATOR_ENTRY *new_entry, *ptr; |
if (bprm->argc > 0 && r->mode) { |
| 755 |
static DECLARE_MUTEX(lock); |
char *base_argv0 = ee->tmp; |
| 756 |
const struct path_info *saved_original_name, *saved_aggregated_name; |
const char *base_filename; |
| 757 |
int error = -ENOMEM; |
retval = -ENOMEM; |
| 758 |
if (!IsCorrectPath(original_name, 1, 0, -1, __FUNCTION__) || !IsCorrectPath(aggregated_name, 1, -1, -1, __FUNCTION__)) return -EINVAL; |
if (!ccs_get_argv0(ee)) |
|
if ((saved_original_name = SaveName(original_name)) == NULL || (saved_aggregated_name = SaveName(aggregated_name)) == NULL) return -ENOMEM; |
|
|
down(&lock); |
|
|
for (ptr = aggregator_list; ptr; ptr = ptr->next) { |
|
|
if (ptr->original_name == saved_original_name && ptr->aggregated_name == saved_aggregated_name) { |
|
|
ptr->is_deleted = is_delete; |
|
|
error = 0; |
|
| 759 |
goto out; |
goto out; |
| 760 |
|
base_filename = strrchr(ee->program_path, '/'); |
| 761 |
|
if (!base_filename) |
| 762 |
|
base_filename = ee->program_path; |
| 763 |
|
else |
| 764 |
|
base_filename++; |
| 765 |
|
if (strcmp(base_argv0, base_filename)) { |
| 766 |
|
retval = ccs_check_argv0_perm(r, &rn, base_argv0); |
| 767 |
|
if (retval == 1) |
| 768 |
|
goto retry; |
| 769 |
|
if (retval < 0) |
| 770 |
|
goto out; |
| 771 |
} |
} |
| 772 |
} |
} |
| 773 |
if (is_delete) { |
|
| 774 |
error = -ENOENT; |
/* Check 'aggregator' directive. */ |
| 775 |
|
{ |
| 776 |
|
struct ccs_aggregator_entry *ptr; |
| 777 |
|
/* Is this program allowed to be aggregated? */ |
| 778 |
|
list_for_each_entry_rcu(ptr, &ccs_aggregator_list, list) { |
| 779 |
|
if (ptr->is_deleted || |
| 780 |
|
!ccs_path_matches_pattern(&rn, ptr->original_name)) |
| 781 |
|
continue; |
| 782 |
|
strncpy(ee->program_path, ptr->aggregated_name->name, |
| 783 |
|
CCS_MAX_PATHNAME_LEN - 1); |
| 784 |
|
ccs_fill_path_info(&rn); |
| 785 |
|
break; |
| 786 |
|
} |
| 787 |
|
} |
| 788 |
|
|
| 789 |
|
/* Check execute permission. */ |
| 790 |
|
r->mode = mode; |
| 791 |
|
retval = ccs_check_exec_perm(r, &rn); |
| 792 |
|
if (retval == 1) |
| 793 |
|
goto retry; |
| 794 |
|
if (retval < 0) |
| 795 |
goto out; |
goto out; |
| 796 |
|
|
| 797 |
|
calculate_domain: |
| 798 |
|
new_domain_name = ee->tmp; |
| 799 |
|
if (ccs_is_domain_initializer(r->domain->domainname, &rn, &ln)) { |
| 800 |
|
/* Transit to the child of ccs_kernel_domain domain. */ |
| 801 |
|
snprintf(new_domain_name, CCS_EXEC_TMPSIZE - 1, |
| 802 |
|
ROOT_NAME " " "%s", ee->program_path); |
| 803 |
|
} else if (r->domain == &ccs_kernel_domain && !ccs_policy_loaded) { |
| 804 |
|
/* |
| 805 |
|
* Needn't to transit from kernel domain before starting |
| 806 |
|
* /sbin/init. But transit from kernel domain if executing |
| 807 |
|
* initializers because they might start before /sbin/init. |
| 808 |
|
*/ |
| 809 |
|
domain = r->domain; |
| 810 |
|
} else if (ccs_is_domain_keeper(r->domain->domainname, &rn, &ln)) { |
| 811 |
|
/* Keep current domain. */ |
| 812 |
|
domain = r->domain; |
| 813 |
|
} else { |
| 814 |
|
/* Normal domain transition. */ |
| 815 |
|
snprintf(new_domain_name, CCS_EXEC_TMPSIZE - 1, |
| 816 |
|
"%s %s", old_domain_name, ee->program_path); |
| 817 |
} |
} |
| 818 |
if ((new_entry = (AGGREGATOR_ENTRY *) alloc_element(sizeof(AGGREGATOR_ENTRY))) == NULL) goto out; |
if (domain || strlen(new_domain_name) >= CCS_MAX_PATHNAME_LEN) |
| 819 |
new_entry->original_name = saved_original_name; |
goto done; |
| 820 |
new_entry->aggregated_name = saved_aggregated_name; |
domain = ccs_find_domain(new_domain_name); |
| 821 |
mb(); /* Instead of using spinlock. */ |
if (domain) |
| 822 |
if ((ptr = aggregator_list) != NULL) { |
goto done; |
| 823 |
while (ptr->next) ptr = ptr->next; ptr->next = new_entry; |
if (is_enforce) { |
| 824 |
|
int error = ccs_check_supervisor(r, |
| 825 |
|
"# wants to create domain\n" |
| 826 |
|
"%s\n", new_domain_name); |
| 827 |
|
if (error == 1) |
| 828 |
|
goto retry; |
| 829 |
|
if (error < 0) |
| 830 |
|
goto done; |
| 831 |
|
} |
| 832 |
|
domain = ccs_find_or_assign_new_domain(new_domain_name, r->profile); |
| 833 |
|
if (domain) |
| 834 |
|
ccs_audit_domain_creation_log(r->domain); |
| 835 |
|
done: |
| 836 |
|
if (!domain) { |
| 837 |
|
printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", |
| 838 |
|
new_domain_name); |
| 839 |
|
if (is_enforce) |
| 840 |
|
retval = -EPERM; |
| 841 |
|
else { |
| 842 |
|
retval = 0; |
| 843 |
|
r->domain->domain_transition_failed = true; |
| 844 |
|
} |
| 845 |
} else { |
} else { |
| 846 |
aggregator_list = new_entry; |
retval = 0; |
| 847 |
} |
} |
|
error = 0; |
|
| 848 |
out: |
out: |
| 849 |
up(&lock); |
if (domain) |
| 850 |
return error; |
r->domain = domain; |
| 851 |
|
return retval; |
| 852 |
} |
} |
| 853 |
|
|
| 854 |
int ReadAggregatorPolicy(IO_BUFFER *head) |
/** |
| 855 |
|
* ccs_check_environ - Check permission for environment variable names. |
| 856 |
|
* |
| 857 |
|
* @ee: Pointer to "struct ccs_execve_entry". |
| 858 |
|
* |
| 859 |
|
* Returns 0 on success, negative value otherwise. |
| 860 |
|
*/ |
| 861 |
|
static int ccs_check_environ(struct ccs_execve_entry *ee) |
| 862 |
{ |
{ |
| 863 |
AGGREGATOR_ENTRY *ptr = (AGGREGATOR_ENTRY *) head->read_var2; |
struct ccs_request_info *r = &ee->r; |
| 864 |
if (!ptr) ptr = aggregator_list; |
struct linux_binprm *bprm = ee->bprm; |
| 865 |
while (ptr) { |
char *arg_ptr = ee->tmp; |
| 866 |
head->read_var2 = (void *) ptr; |
int arg_len = 0; |
| 867 |
if (!ptr->is_deleted && io_printf(head, KEYWORD_AGGREGATOR "%s %s\n", ptr->original_name->name, ptr->aggregated_name->name)) break; |
unsigned long pos = bprm->p; |
| 868 |
ptr = ptr->next; |
int offset = pos % PAGE_SIZE; |
| 869 |
|
int argv_count = bprm->argc; |
| 870 |
|
int envp_count = bprm->envc; |
| 871 |
|
/* printk(KERN_DEBUG "start %d %d\n", argv_count, envp_count); */ |
| 872 |
|
int error = -ENOMEM; |
| 873 |
|
if (!r->mode || !envp_count) |
| 874 |
|
return 0; |
| 875 |
|
while (error == -ENOMEM) { |
| 876 |
|
if (!ccs_dump_page(bprm, pos, &ee->dump)) |
| 877 |
|
goto out; |
| 878 |
|
pos += PAGE_SIZE - offset; |
| 879 |
|
/* Read. */ |
| 880 |
|
while (argv_count && offset < PAGE_SIZE) { |
| 881 |
|
const char *kaddr = ee->dump.data; |
| 882 |
|
if (!kaddr[offset++]) |
| 883 |
|
argv_count--; |
| 884 |
|
} |
| 885 |
|
if (argv_count) { |
| 886 |
|
offset = 0; |
| 887 |
|
continue; |
| 888 |
|
} |
| 889 |
|
while (offset < PAGE_SIZE) { |
| 890 |
|
const char *kaddr = ee->dump.data; |
| 891 |
|
const unsigned char c = kaddr[offset++]; |
| 892 |
|
if (c && arg_len < CCS_MAX_PATHNAME_LEN - 10) { |
| 893 |
|
if (c == '=') { |
| 894 |
|
arg_ptr[arg_len++] = '\0'; |
| 895 |
|
} else if (c == '\\') { |
| 896 |
|
arg_ptr[arg_len++] = '\\'; |
| 897 |
|
arg_ptr[arg_len++] = '\\'; |
| 898 |
|
} else if (c > ' ' && c < 127) { |
| 899 |
|
arg_ptr[arg_len++] = c; |
| 900 |
|
} else { |
| 901 |
|
arg_ptr[arg_len++] = '\\'; |
| 902 |
|
arg_ptr[arg_len++] = (c >> 6) + '0'; |
| 903 |
|
arg_ptr[arg_len++] |
| 904 |
|
= ((c >> 3) & 7) + '0'; |
| 905 |
|
arg_ptr[arg_len++] = (c & 7) + '0'; |
| 906 |
|
} |
| 907 |
|
} else { |
| 908 |
|
arg_ptr[arg_len] = '\0'; |
| 909 |
|
} |
| 910 |
|
if (c) |
| 911 |
|
continue; |
| 912 |
|
if (ccs_check_env_perm(r, arg_ptr)) { |
| 913 |
|
error = -EPERM; |
| 914 |
|
break; |
| 915 |
|
} |
| 916 |
|
if (!--envp_count) { |
| 917 |
|
error = 0; |
| 918 |
|
break; |
| 919 |
|
} |
| 920 |
|
arg_len = 0; |
| 921 |
|
} |
| 922 |
|
offset = 0; |
| 923 |
} |
} |
| 924 |
return ptr ? -ENOMEM : 0; |
out: |
| 925 |
|
if (r->mode != 3) |
| 926 |
|
error = 0; |
| 927 |
|
return error; |
| 928 |
} |
} |
| 929 |
|
|
| 930 |
int AddAggregatorPolicy(char *data, const int is_delete) |
/** |
| 931 |
|
* ccs_unescape - Unescape escaped string. |
| 932 |
|
* |
| 933 |
|
* @dest: String to unescape. |
| 934 |
|
* |
| 935 |
|
* Returns nothing. |
| 936 |
|
*/ |
| 937 |
|
static void ccs_unescape(unsigned char *dest) |
| 938 |
{ |
{ |
| 939 |
char *cp = strchr(data, ' '); |
unsigned char *src = dest; |
| 940 |
if (!cp) return -EINVAL; |
unsigned char c; |
| 941 |
*cp++ = '\0'; |
unsigned char d; |
| 942 |
return AddAggregatorEntry(data, cp, is_delete); |
unsigned char e; |
| 943 |
|
while (1) { |
| 944 |
|
c = *src++; |
| 945 |
|
if (!c) |
| 946 |
|
break; |
| 947 |
|
if (c != '\\') { |
| 948 |
|
*dest++ = c; |
| 949 |
|
continue; |
| 950 |
|
} |
| 951 |
|
c = *src++; |
| 952 |
|
if (c == '\\') { |
| 953 |
|
*dest++ = c; |
| 954 |
|
continue; |
| 955 |
|
} |
| 956 |
|
if (c < '0' || c > '3') |
| 957 |
|
break; |
| 958 |
|
d = *src++; |
| 959 |
|
if (d < '0' || d > '7') |
| 960 |
|
break; |
| 961 |
|
e = *src++; |
| 962 |
|
if (e < '0' || e > '7') |
| 963 |
|
break; |
| 964 |
|
*dest++ = ((c - '0') << 6) + ((d - '0') << 3) + (e - '0'); |
| 965 |
|
} |
| 966 |
|
*dest = '\0'; |
| 967 |
} |
} |
| 968 |
|
|
| 969 |
/************************* DOMAIN DELETION HANDLER *************************/ |
/** |
| 970 |
|
* ccs_root_depth - Get number of directories to strip. |
| 971 |
// #define DEBUG_DOMAIN_UNDELETE |
* |
| 972 |
|
* @dentry: Pointer to "struct dentry". |
| 973 |
int DeleteDomain(char *domainname0) |
* @vfsmnt: Pointer to "struct vfsmount". |
| 974 |
|
* |
| 975 |
|
* Returns number of directories to strip. |
| 976 |
|
*/ |
| 977 |
|
static inline int ccs_root_depth(struct dentry *dentry, struct vfsmount *vfsmnt) |
| 978 |
{ |
{ |
| 979 |
struct domain_info *domain; |
int depth = 0; |
| 980 |
struct path_info domainname; |
/***** CRITICAL SECTION START *****/ |
| 981 |
domainname.name = domainname0; |
ccs_realpath_lock(); |
| 982 |
fill_path_info(&domainname); |
for (;;) { |
| 983 |
down(&new_domain_assign_lock); |
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) { |
| 984 |
#ifdef DEBUG_DOMAIN_UNDELETE |
/* Global root? */ |
| 985 |
printk("DeleteDomain %s\n", domainname0); |
if (vfsmnt->mnt_parent == vfsmnt) |
| 986 |
for (domain = KERNEL_DOMAIN.next; domain; domain = domain->next) { |
break; |
| 987 |
if (pathcmp(domain->domainname, &domainname)) continue; |
dentry = vfsmnt->mnt_mountpoint; |
| 988 |
printk("List: %p %u\n", domain, domain->is_deleted); |
vfsmnt = vfsmnt->mnt_parent; |
| 989 |
|
continue; |
| 990 |
|
} |
| 991 |
|
dentry = dentry->d_parent; |
| 992 |
|
depth++; |
| 993 |
} |
} |
| 994 |
|
ccs_realpath_unlock(); |
| 995 |
|
/***** CRITICAL SECTION END *****/ |
| 996 |
|
return depth; |
| 997 |
|
} |
| 998 |
|
|
| 999 |
|
/** |
| 1000 |
|
* ccs_get_root_depth - return the depth of root directory. |
| 1001 |
|
* |
| 1002 |
|
* Returns number of directories to strip. |
| 1003 |
|
*/ |
| 1004 |
|
static int ccs_get_root_depth(void) |
| 1005 |
|
{ |
| 1006 |
|
int depth; |
| 1007 |
|
struct dentry *dentry; |
| 1008 |
|
struct vfsmount *vfsmnt; |
| 1009 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
| 1010 |
|
struct path root; |
| 1011 |
#endif |
#endif |
| 1012 |
/* Is there an active domain? */ |
/***** CRITICAL SECTION START *****/ |
| 1013 |
for (domain = KERNEL_DOMAIN.next; domain; domain = domain->next) { /* Never delete KERNEL_DOMAIN */ |
read_lock(¤t->fs->lock); |
| 1014 |
if (domain->is_deleted || pathcmp(domain->domainname, &domainname)) continue; |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
| 1015 |
break; |
root = current->fs->root; |
| 1016 |
} |
path_get(¤t->fs->root); |
| 1017 |
if (domain) { |
dentry = root.dentry; |
| 1018 |
struct domain_info *domain2; |
vfsmnt = root.mnt; |
| 1019 |
/* Mark already deleted domains as non undeletable. */ |
#else |
| 1020 |
for (domain2 = KERNEL_DOMAIN.next; domain2; domain2 = domain2->next) { |
dentry = dget(current->fs->root); |
| 1021 |
if (!domain2->is_deleted || pathcmp(domain2->domainname, &domainname)) continue; |
vfsmnt = mntget(current->fs->rootmnt); |
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
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); |
|
| 1022 |
#endif |
#endif |
| 1023 |
} |
read_unlock(¤t->fs->lock); |
| 1024 |
up(&new_domain_assign_lock); |
/***** CRITICAL SECTION END *****/ |
| 1025 |
return 0; |
depth = ccs_root_depth(dentry, vfsmnt); |
| 1026 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
| 1027 |
|
path_put(&root); |
| 1028 |
|
#else |
| 1029 |
|
dput(dentry); |
| 1030 |
|
mntput(vfsmnt); |
| 1031 |
|
#endif |
| 1032 |
|
return depth; |
| 1033 |
} |
} |
| 1034 |
|
|
| 1035 |
struct domain_info *UndeleteDomain(const char *domainname0) |
static LIST_HEAD(ccs_execve_list); |
| 1036 |
|
static DEFINE_SPINLOCK(ccs_execve_list_lock); |
| 1037 |
|
|
| 1038 |
|
/** |
| 1039 |
|
* ccs_allocate_execve_entry - Allocate memory for execve(). |
| 1040 |
|
* |
| 1041 |
|
* Returns pointer to "struct ccs_execve_entry" on success, NULL otherwise. |
| 1042 |
|
*/ |
| 1043 |
|
static struct ccs_execve_entry *ccs_allocate_execve_entry(void) |
| 1044 |
{ |
{ |
| 1045 |
struct domain_info *domain, *candidate_domain = NULL; |
struct ccs_execve_entry *ee = kzalloc(sizeof(*ee), GFP_KERNEL); |
| 1046 |
struct path_info domainname; |
if (!ee) |
| 1047 |
domainname.name = domainname0; |
return NULL; |
| 1048 |
fill_path_info(&domainname); |
ee->program_path = kzalloc(CCS_MAX_PATHNAME_LEN, GFP_KERNEL); |
| 1049 |
down(&new_domain_assign_lock); |
ee->tmp = kzalloc(CCS_EXEC_TMPSIZE, GFP_KERNEL); |
| 1050 |
#ifdef DEBUG_DOMAIN_UNDELETE |
if (!ee->program_path || !ee->tmp) { |
| 1051 |
printk("UndeleteDomain %s\n", domainname0); |
kfree(ee->program_path); |
| 1052 |
for (domain = KERNEL_DOMAIN.next; domain; domain = domain->next) { |
kfree(ee->tmp); |
| 1053 |
if (pathcmp(domain->domainname, &domainname)) continue; |
kfree(ee); |
| 1054 |
printk("List: %p %u\n", domain, domain->is_deleted); |
return NULL; |
| 1055 |
} |
} |
| 1056 |
#endif |
ee->reader_idx = ccs_read_lock(); |
| 1057 |
for (domain = KERNEL_DOMAIN.next; domain; domain = domain->next) { |
/* ee->dump->data is allocated by ccs_dump_page(). */ |
| 1058 |
if (pathcmp(&domainname, domain->domainname)) continue; |
ee->task = current; |
| 1059 |
if (!domain->is_deleted) { |
/***** CRITICAL SECTION START *****/ |
| 1060 |
/* This domain is active. I can't undelete. */ |
spin_lock(&ccs_execve_list_lock); |
| 1061 |
candidate_domain = NULL; |
list_add(&ee->list, &ccs_execve_list); |
| 1062 |
#ifdef DEBUG_DOMAIN_UNDELETE |
spin_unlock(&ccs_execve_list_lock); |
| 1063 |
printk("%p is active. I can't undelete.\n", domain); |
/***** CRITICAL SECTION END *****/ |
| 1064 |
#endif |
return ee; |
|
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 |
|
|
} |
|
|
up(&new_domain_assign_lock); |
|
|
return candidate_domain; |
|
|
} |
|
|
|
|
|
/************************* DOMAIN TRANSITION HANDLER *************************/ |
|
|
|
|
|
struct domain_info *FindDomain(const char *domainname0) |
|
|
{ |
|
|
struct domain_info *domain; |
|
|
static int first = 1; |
|
|
struct path_info domainname; |
|
|
domainname.name = domainname0; |
|
|
fill_path_info(&domainname); |
|
|
if (first) { |
|
|
KERNEL_DOMAIN.domainname = SaveName(ROOT_NAME); |
|
|
first = 0; |
|
|
} |
|
|
for (domain = &KERNEL_DOMAIN; domain; domain = domain->next) { |
|
|
if (!domain->is_deleted && !pathcmp(&domainname, domain->domainname)) return domain; |
|
|
} |
|
|
return NULL; |
|
|
} |
|
|
|
|
|
struct domain_info *FindOrAssignNewDomain(const char *domainname, const u8 profile) |
|
|
{ |
|
|
struct domain_info *domain = NULL; |
|
|
const struct path_info *saved_domainname; |
|
|
down(&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? */ |
|
|
for (domain = KERNEL_DOMAIN.next; domain; domain = domain->next) { |
|
|
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 |
|
|
for (ptr = domain->first_acl_ptr; ptr; ptr = ptr->next) ptr->is_deleted = 1; |
|
|
domain->profile = profile; |
|
|
domain->quota_warned = 0; |
|
|
mb(); /* Instead of using spinlock. */ |
|
|
domain->is_deleted = 0; |
|
|
goto out; |
|
|
} |
|
|
/* No memory reusable. Create using new memory. */ |
|
|
if ((domain = (struct domain_info *) alloc_element(sizeof(struct domain_info))) != NULL) { |
|
|
struct domain_info *ptr = &KERNEL_DOMAIN; |
|
|
domain->domainname = saved_domainname; |
|
|
domain->profile = profile; |
|
|
mb(); /* Instead of using spinlock. */ |
|
|
while (ptr->next) ptr = ptr->next; ptr->next = domain; |
|
|
} |
|
|
out: ; |
|
|
up(&new_domain_assign_lock); |
|
|
return domain; |
|
| 1065 |
} |
} |
| 1066 |
|
|
| 1067 |
static int Escape(char *dest, const char *src, int dest_len) |
/** |
| 1068 |
|
* ccs_find_execve_entry - Find ccs_execve_entry of current process. |
| 1069 |
|
* |
| 1070 |
|
* Returns pointer to "struct ccs_execve_entry" on success, NULL otherwise. |
| 1071 |
|
*/ |
| 1072 |
|
static struct ccs_execve_entry *ccs_find_execve_entry(void) |
| 1073 |
{ |
{ |
| 1074 |
while (*src) { |
struct task_struct *task = current; |
| 1075 |
const unsigned char c = * (const unsigned char *) src; |
struct ccs_execve_entry *ee = NULL; |
| 1076 |
if (c == '\\') { |
struct ccs_execve_entry *p; |
| 1077 |
dest_len -= 2; |
/***** CRITICAL SECTION START *****/ |
| 1078 |
if (dest_len <= 0) goto out; |
spin_lock(&ccs_execve_list_lock); |
| 1079 |
*dest++ = '\\'; |
list_for_each_entry(p, &ccs_execve_list, list) { |
| 1080 |
*dest++ = '\\'; |
if (p->task != task) |
| 1081 |
} else if (c > ' ' && c < 127) { |
continue; |
| 1082 |
if (--dest_len <= 0) goto out; |
ee = p; |
| 1083 |
*dest++ = c; |
break; |
|
} else { |
|
|
dest_len -= 4; |
|
|
if (dest_len <= 0) goto out; |
|
|
*dest++ = '\\'; |
|
|
*dest++ = (c >> 6) + '0'; |
|
|
*dest++ = ((c >> 3) & 7) + '0'; |
|
|
*dest++ = (c & 7) + '0'; |
|
|
} |
|
|
src++; |
|
| 1084 |
} |
} |
| 1085 |
if (--dest_len <= 0) goto out; |
spin_unlock(&ccs_execve_list_lock); |
| 1086 |
*dest = '\0'; |
/***** CRITICAL SECTION END *****/ |
| 1087 |
return 0; |
return ee; |
|
out: |
|
|
return -ENOMEM; |
|
| 1088 |
} |
} |
| 1089 |
|
|
| 1090 |
static char *get_argv0(struct linux_binprm *bprm) |
/** |
| 1091 |
|
* ccs_free_execve_entry - Free memory for execve(). |
| 1092 |
|
* |
| 1093 |
|
* @ee: Pointer to "struct ccs_execve_entry". |
| 1094 |
|
*/ |
| 1095 |
|
static void ccs_free_execve_entry(struct ccs_execve_entry *ee) |
| 1096 |
{ |
{ |
| 1097 |
if (bprm->argc > 0) { |
if (!ee) |
| 1098 |
char *arg_ptr = ccs_alloc(PAGE_SIZE); |
return; |
| 1099 |
int arg_len = 0; |
/***** CRITICAL SECTION START *****/ |
| 1100 |
const unsigned long pos = bprm->p; |
spin_lock(&ccs_execve_list_lock); |
| 1101 |
int i = pos / PAGE_SIZE, offset = pos % PAGE_SIZE; |
list_del(&ee->list); |
| 1102 |
if (!arg_ptr) goto out; |
spin_unlock(&ccs_execve_list_lock); |
| 1103 |
while (1) { |
/***** CRITICAL SECTION END *****/ |
| 1104 |
struct page *page = bprm->page[i]; |
kfree(ee->program_path); |
| 1105 |
const char *kaddr = kmap(page); |
kfree(ee->tmp); |
| 1106 |
if (!kaddr) goto out; |
kfree(ee->dump.data); |
| 1107 |
memmove(arg_ptr + arg_len, kaddr + offset, PAGE_SIZE - offset); |
ccs_read_unlock(ee->reader_idx); |
| 1108 |
kunmap(page); |
kfree(ee); |
|
arg_len += PAGE_SIZE - offset; |
|
|
if (memchr(arg_ptr, '\0', arg_len)) break; |
|
|
{ |
|
|
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: |
|
|
ccs_free(arg_ptr); |
|
|
} |
|
|
return NULL; |
|
| 1109 |
} |
} |
| 1110 |
|
|
| 1111 |
static int FindNextDomain(struct linux_binprm *bprm, struct domain_info **next_domain) |
/** |
| 1112 |
|
* ccs_try_alt_exec - Try to start execute handler. |
| 1113 |
|
* |
| 1114 |
|
* @ee: Pointer to "struct ccs_execve_entry". |
| 1115 |
|
* |
| 1116 |
|
* Returns 0 on success, negative value otherwise. |
| 1117 |
|
*/ |
| 1118 |
|
static int ccs_try_alt_exec(struct ccs_execve_entry *ee) |
| 1119 |
{ |
{ |
| 1120 |
/* This function assumes that the size of buffer returned by realpath() = CCS_MAX_PATHNAME_LEN. */ |
/* |
| 1121 |
struct domain_info *old_domain = current->domain_info, *domain = NULL; |
* Contents of modified bprm. |
| 1122 |
const char *old_domain_name = old_domain->domainname->name; |
* The envp[] in original bprm is moved to argv[] so that |
| 1123 |
const char *original_name = bprm->filename; |
* the alternatively executed program won't be affected by |
| 1124 |
struct file *filp = bprm->file; |
* some dangerous environment variables like LD_PRELOAD. |
| 1125 |
char *new_domain_name = NULL; |
* |
| 1126 |
char *real_program_name = NULL, *symlink_program_name = NULL; |
* modified bprm->argc |
| 1127 |
const int is_enforce = CheckCCSEnforce(CCS_TOMOYO_MAC_FOR_FILE); |
* = original bprm->argc + original bprm->envc + 7 |
| 1128 |
|
* modified bprm->envc |
| 1129 |
|
* = 0 |
| 1130 |
|
* |
| 1131 |
|
* modified bprm->argv[0] |
| 1132 |
|
* = the program's name specified by execute_handler |
| 1133 |
|
* modified bprm->argv[1] |
| 1134 |
|
* = ccs_current_domain()->domainname->name |
| 1135 |
|
* modified bprm->argv[2] |
| 1136 |
|
* = the current process's name |
| 1137 |
|
* modified bprm->argv[3] |
| 1138 |
|
* = the current process's information (e.g. uid/gid). |
| 1139 |
|
* modified bprm->argv[4] |
| 1140 |
|
* = original bprm->filename |
| 1141 |
|
* modified bprm->argv[5] |
| 1142 |
|
* = original bprm->argc in string expression |
| 1143 |
|
* modified bprm->argv[6] |
| 1144 |
|
* = original bprm->envc in string expression |
| 1145 |
|
* modified bprm->argv[7] |
| 1146 |
|
* = original bprm->argv[0] |
| 1147 |
|
* ... |
| 1148 |
|
* modified bprm->argv[bprm->argc + 6] |
| 1149 |
|
* = original bprm->argv[bprm->argc - 1] |
| 1150 |
|
* modified bprm->argv[bprm->argc + 7] |
| 1151 |
|
* = original bprm->envp[0] |
| 1152 |
|
* ... |
| 1153 |
|
* modified bprm->argv[bprm->envc + bprm->argc + 6] |
| 1154 |
|
* = original bprm->envp[bprm->envc - 1] |
| 1155 |
|
*/ |
| 1156 |
|
struct linux_binprm *bprm = ee->bprm; |
| 1157 |
|
struct file *filp; |
| 1158 |
int retval; |
int retval; |
| 1159 |
struct path_info r, s, l; |
const int original_argc = bprm->argc; |
| 1160 |
|
const int original_envc = bprm->envc; |
| 1161 |
|
struct task_struct *task = current; |
| 1162 |
|
|
| 1163 |
|
/* Close the requested program's dentry. */ |
| 1164 |
|
allow_write_access(bprm->file); |
| 1165 |
|
fput(bprm->file); |
| 1166 |
|
bprm->file = NULL; |
| 1167 |
|
|
| 1168 |
|
/* Invalidate page dump cache. */ |
| 1169 |
|
ee->dump.page = NULL; |
| 1170 |
|
|
| 1171 |
|
/* Move envp[] to argv[] */ |
| 1172 |
|
bprm->argc += bprm->envc; |
| 1173 |
|
bprm->envc = 0; |
| 1174 |
|
|
| 1175 |
|
/* Set argv[6] */ |
| 1176 |
{ |
{ |
| 1177 |
/* |
char *cp = ee->tmp; |
| 1178 |
* Built-in initializers. This is needed because policies are not loaded until starting /sbin/init . |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_envc); |
| 1179 |
*/ |
retval = copy_strings_kernel(1, &cp, bprm); |
| 1180 |
static int first = 1; |
if (retval < 0) |
| 1181 |
if (first) { |
goto out; |
| 1182 |
AddDomainInitializerEntry(NULL, "/sbin/hotplug", 0, 0, 0); |
bprm->argc++; |
|
AddDomainInitializerEntry(NULL, "/sbin/modprobe", 0, 0, 0); |
|
|
first = 0; |
|
|
} |
|
| 1183 |
} |
} |
| 1184 |
|
|
| 1185 |
/* Get realpath of program. */ |
/* Set argv[5] */ |
| 1186 |
retval = -ENOENT; /* I hope realpath() won't fail with -ENOMEM. */ |
{ |
| 1187 |
if ((real_program_name = realpath(original_name)) == NULL) goto out; |
char *cp = ee->tmp; |
| 1188 |
/* Get realpath of symbolic link. */ |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_argc); |
| 1189 |
if ((symlink_program_name = realpath_nofollow(original_name)) == NULL) goto out; |
retval = copy_strings_kernel(1, &cp, bprm); |
| 1190 |
|
if (retval < 0) |
| 1191 |
r.name = real_program_name; |
goto out; |
| 1192 |
fill_path_info(&r); |
bprm->argc++; |
|
s.name = symlink_program_name; |
|
|
fill_path_info(&s); |
|
|
if ((l.name = strrchr(old_domain_name, ' ')) != NULL) l.name++; |
|
|
else l.name = old_domain_name; |
|
|
fill_path_info(&l); |
|
|
|
|
|
/* Check 'alias' directive. */ |
|
|
if (pathcmp(&r, &s)) { |
|
|
ALIAS_ENTRY *ptr; |
|
|
/* Is this program allowed to be called via symbolic links? */ |
|
|
for (ptr = alias_list; ptr; ptr = ptr->next) { |
|
|
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; |
|
|
} |
|
| 1193 |
} |
} |
| 1194 |
|
|
| 1195 |
/* Check 'aggregator' directive. */ |
/* Set argv[4] */ |
| 1196 |
{ |
{ |
| 1197 |
AGGREGATOR_ENTRY *ptr; |
retval = copy_strings_kernel(1, &bprm->filename, bprm); |
| 1198 |
/* Is this program allowed to be aggregated? */ |
if (retval < 0) |
| 1199 |
for (ptr = aggregator_list; ptr; ptr = ptr->next) { |
goto out; |
| 1200 |
if (ptr->is_deleted || !PathMatchesToPattern(&r, ptr->original_name)) continue; |
bprm->argc++; |
| 1201 |
memset(real_program_name, 0, CCS_MAX_PATHNAME_LEN); |
} |
| 1202 |
strncpy(real_program_name, ptr->aggregated_name->name, CCS_MAX_PATHNAME_LEN - 1); |
|
| 1203 |
fill_path_info(&r); |
/* Set argv[3] */ |
| 1204 |
break; |
{ |
| 1205 |
|
char *cp = ee->tmp; |
| 1206 |
|
const u32 ccs_flags = task->ccs_flags; |
| 1207 |
|
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, |
| 1208 |
|
"pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " |
| 1209 |
|
"sgid=%d fsuid=%d fsgid=%d state[0]=%u " |
| 1210 |
|
"state[1]=%u state[2]=%u", |
| 1211 |
|
(pid_t) sys_getpid(), current_uid(), current_gid(), |
| 1212 |
|
current_euid(), current_egid(), current_suid(), |
| 1213 |
|
current_sgid(), current_fsuid(), current_fsgid(), |
| 1214 |
|
(u8) (ccs_flags >> 24), (u8) (ccs_flags >> 16), |
| 1215 |
|
(u8) (ccs_flags >> 8)); |
| 1216 |
|
retval = copy_strings_kernel(1, &cp, bprm); |
| 1217 |
|
if (retval < 0) |
| 1218 |
|
goto out; |
| 1219 |
|
bprm->argc++; |
| 1220 |
|
} |
| 1221 |
|
|
| 1222 |
|
/* Set argv[2] */ |
| 1223 |
|
{ |
| 1224 |
|
char *exe = (char *) ccs_get_exe(); |
| 1225 |
|
if (exe) { |
| 1226 |
|
retval = copy_strings_kernel(1, &exe, bprm); |
| 1227 |
|
kfree(exe); |
| 1228 |
|
} else { |
| 1229 |
|
exe = ee->tmp; |
| 1230 |
|
strncpy(ee->tmp, "<unknown>", CCS_EXEC_TMPSIZE - 1); |
| 1231 |
|
retval = copy_strings_kernel(1, &exe, bprm); |
| 1232 |
} |
} |
| 1233 |
|
if (retval < 0) |
| 1234 |
|
goto out; |
| 1235 |
|
bprm->argc++; |
| 1236 |
} |
} |
| 1237 |
|
|
| 1238 |
/* Compare basename of symlink_program_name and argv[0] */ |
/* Set argv[1] */ |
| 1239 |
if (bprm->argc > 0 && CheckCCSFlags(CCS_TOMOYO_MAC_FOR_ARGV0)) { |
{ |
| 1240 |
char *org_argv0 = get_argv0(bprm); |
char *cp = ee->tmp; |
| 1241 |
retval = -ENOMEM; |
strncpy(ee->tmp, ccs_current_domain()->domainname->name, |
| 1242 |
if (org_argv0) { |
CCS_EXEC_TMPSIZE - 1); |
| 1243 |
const int len = strlen(org_argv0); |
retval = copy_strings_kernel(1, &cp, bprm); |
| 1244 |
char *printable_argv0 = ccs_alloc(len * 4 + 8); |
if (retval < 0) |
| 1245 |
if (printable_argv0 && Escape(printable_argv0, org_argv0, len * 4 + 8) == 0) { |
goto out; |
| 1246 |
const char *base_argv0, *base_filename; |
bprm->argc++; |
| 1247 |
if ((base_argv0 = strrchr(printable_argv0, '/')) == NULL) base_argv0 = printable_argv0; else base_argv0++; |
} |
| 1248 |
if ((base_filename = strrchr(symlink_program_name, '/')) == NULL) base_filename = symlink_program_name; else base_filename++; |
|
| 1249 |
if (strcmp(base_argv0, base_filename)) retval = CheckArgv0Perm(&s, base_argv0); |
/* Set argv[0] */ |
| 1250 |
else retval = 0; |
{ |
| 1251 |
} |
int depth = ccs_get_root_depth(); |
| 1252 |
ccs_free(printable_argv0); |
char *cp = ee->program_path; |
| 1253 |
ccs_free(org_argv0); |
strncpy(cp, ee->handler->name, CCS_MAX_PATHNAME_LEN - 1); |
| 1254 |
|
ccs_unescape(cp); |
| 1255 |
|
retval = -ENOENT; |
| 1256 |
|
if (!*cp || *cp != '/') |
| 1257 |
|
goto out; |
| 1258 |
|
/* Adjust root directory for open_exec(). */ |
| 1259 |
|
while (depth) { |
| 1260 |
|
cp = strchr(cp + 1, '/'); |
| 1261 |
|
if (!cp) |
| 1262 |
|
goto out; |
| 1263 |
|
depth--; |
| 1264 |
} |
} |
| 1265 |
if (retval) goto out; |
memmove(ee->program_path, cp, strlen(cp) + 1); |
| 1266 |
|
cp = ee->program_path; |
| 1267 |
|
retval = copy_strings_kernel(1, &cp, bprm); |
| 1268 |
|
if (retval < 0) |
| 1269 |
|
goto out; |
| 1270 |
|
bprm->argc++; |
| 1271 |
} |
} |
| 1272 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) |
| 1273 |
/* Check execute permission. */ |
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) |
| 1274 |
if ((retval = CheckExecPerm(&r, filp)) < 0) goto out; |
bprm->argv_len = bprm->exec - bprm->p; |
| 1275 |
|
#endif |
| 1276 |
|
#endif |
| 1277 |
|
|
| 1278 |
/* Allocate memory for calcurating domain name. */ |
/* OK, now restart the process with execute handler program's dentry. */ |
| 1279 |
retval = -ENOMEM; |
filp = open_exec(ee->program_path); |
| 1280 |
if ((new_domain_name = ccs_alloc(CCS_MAX_PATHNAME_LEN + 16)) == NULL) goto out; |
if (IS_ERR(filp)) { |
| 1281 |
|
retval = PTR_ERR(filp); |
| 1282 |
if (IsDomainInitializer(old_domain->domainname, &r, &l)) { |
goto out; |
| 1283 |
/* Transit to the child of KERNEL_DOMAIN domain. */ |
} |
| 1284 |
snprintf(new_domain_name, CCS_MAX_PATHNAME_LEN + 1, ROOT_NAME " " "%s", real_program_name); |
bprm->file = filp; |
| 1285 |
} else if (old_domain == &KERNEL_DOMAIN && !sbin_init_started) { |
bprm->filename = ee->program_path; |
| 1286 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
| 1287 |
|
bprm->interp = bprm->filename; |
| 1288 |
|
#endif |
| 1289 |
|
retval = prepare_binprm(bprm); |
| 1290 |
|
if (retval < 0) |
| 1291 |
|
goto out; |
| 1292 |
|
{ |
| 1293 |
/* |
/* |
| 1294 |
* Needn't to transit from kernel domain before starting /sbin/init . |
* Backup ee->program_path because ccs_find_next_domain() will |
| 1295 |
* But transit from kernel domain if executing initializers, for they might start before /sbin/init . |
* overwrite ee->program_path and ee->tmp. |
| 1296 |
*/ |
*/ |
| 1297 |
domain = old_domain; |
const int len = strlen(ee->program_path) + 1; |
| 1298 |
} else if (IsDomainKeeper(old_domain->domainname, &r, &l)) { |
char *cp = kzalloc(len, GFP_KERNEL); |
| 1299 |
/* Keep current domain. */ |
if (!cp) { |
| 1300 |
domain = old_domain; |
retval = -ENOMEM; |
| 1301 |
} else { |
goto out; |
|
/* Normal domain transition. */ |
|
|
snprintf(new_domain_name, CCS_MAX_PATHNAME_LEN + 1, "%s %s", old_domain_name, real_program_name); |
|
|
} |
|
|
if (!domain && strlen(new_domain_name) < CCS_MAX_PATHNAME_LEN) { |
|
|
if (is_enforce) { |
|
|
domain = FindDomain(new_domain_name); |
|
|
if (!domain) if (CheckSupervisor("#Need to create domain\n%s\n", new_domain_name) == 0) domain = FindOrAssignNewDomain(new_domain_name, current->domain_info->profile); |
|
|
} else { |
|
|
domain = FindOrAssignNewDomain(new_domain_name, current->domain_info->profile); |
|
| 1302 |
} |
} |
| 1303 |
|
memmove(cp, ee->program_path, len); |
| 1304 |
|
bprm->filename = cp; |
| 1305 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
| 1306 |
|
bprm->interp = bprm->filename; |
| 1307 |
|
#endif |
| 1308 |
|
task->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
| 1309 |
|
retval = ccs_find_next_domain(ee); |
| 1310 |
|
task->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
| 1311 |
|
/* Restore ee->program_path for search_binary_handler(). */ |
| 1312 |
|
memmove(ee->program_path, cp, len); |
| 1313 |
|
bprm->filename = ee->program_path; |
| 1314 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
| 1315 |
|
bprm->interp = bprm->filename; |
| 1316 |
|
#endif |
| 1317 |
|
kfree(cp); |
| 1318 |
} |
} |
| 1319 |
if (!domain) { |
out: |
|
printk("TOMOYO-ERROR: Domain '%s' not defined.\n", new_domain_name); |
|
|
if (is_enforce) retval = -EPERM; |
|
|
} else { |
|
|
retval = 0; |
|
|
} |
|
|
out: ; |
|
|
ccs_free(new_domain_name); |
|
|
ccs_free(real_program_name); |
|
|
ccs_free(symlink_program_name); |
|
|
*next_domain = domain ? domain : old_domain; |
|
| 1320 |
return retval; |
return retval; |
| 1321 |
} |
} |
| 1322 |
|
|
| 1323 |
#endif |
/** |
| 1324 |
|
* ccs_find_execute_handler - Find an execute handler. |
| 1325 |
|
* |
| 1326 |
|
* @ee: Pointer to "struct ccs_execve_entry". |
| 1327 |
|
* @type: Type of execute handler. |
| 1328 |
|
* |
| 1329 |
|
* Returns true if found, false otherwise. |
| 1330 |
|
* |
| 1331 |
|
* Caller holds ccs_read_lock(). |
| 1332 |
|
*/ |
| 1333 |
|
static bool ccs_find_execute_handler(struct ccs_execve_entry *ee, |
| 1334 |
|
const u8 type) |
| 1335 |
|
{ |
| 1336 |
|
struct task_struct *task = current; |
| 1337 |
|
const struct ccs_domain_info *domain = ccs_current_domain(); |
| 1338 |
|
struct ccs_acl_info *ptr; |
| 1339 |
|
bool found = false; |
| 1340 |
|
ccs_check_read_lock(); |
| 1341 |
|
/* |
| 1342 |
|
* Don't use execute handler if the current process is |
| 1343 |
|
* marked as execute handler to avoid infinite execute handler loop. |
| 1344 |
|
*/ |
| 1345 |
|
if (task->ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER) |
| 1346 |
|
return false; |
| 1347 |
|
list_for_each_entry(ptr, &domain->acl_info_list, list) { |
| 1348 |
|
struct ccs_execute_handler_record *acl; |
| 1349 |
|
if (ptr->type != type) |
| 1350 |
|
continue; |
| 1351 |
|
acl = container_of(ptr, struct ccs_execute_handler_record, |
| 1352 |
|
head); |
| 1353 |
|
ee->handler = acl->handler; |
| 1354 |
|
found = true; |
| 1355 |
|
break; |
| 1356 |
|
} |
| 1357 |
|
return found; |
| 1358 |
|
} |
| 1359 |
|
|
| 1360 |
int search_binary_handler_with_transition(struct linux_binprm *bprm, struct pt_regs *regs) |
/** |
| 1361 |
|
* ccs_dump_page - Dump a page to buffer. |
| 1362 |
|
* |
| 1363 |
|
* @bprm: Pointer to "struct linux_binprm". |
| 1364 |
|
* @pos: Location to dump. |
| 1365 |
|
* @dump: Poiner to "struct ccs_page_dump". |
| 1366 |
|
* |
| 1367 |
|
* Returns true on success, false otherwise. |
| 1368 |
|
*/ |
| 1369 |
|
bool ccs_dump_page(struct linux_binprm *bprm, unsigned long pos, |
| 1370 |
|
struct ccs_page_dump *dump) |
| 1371 |
{ |
{ |
| 1372 |
struct domain_info *next_domain = NULL, *prev_domain = current->domain_info; |
struct page *page; |
| 1373 |
int retval; |
/* dump->data is released by ccs_free_execve_entry(). */ |
| 1374 |
#if defined(CONFIG_SAKURA) || defined(CONFIG_TOMOYO) |
if (!dump->data) { |
| 1375 |
extern void CCS_LoadPolicy(const char *filename); |
dump->data = kzalloc(PAGE_SIZE, GFP_KERNEL); |
| 1376 |
CCS_LoadPolicy(bprm->filename); |
if (!dump->data) |
| 1377 |
#endif |
return false; |
| 1378 |
#if defined(CONFIG_TOMOYO) |
} |
| 1379 |
retval = FindNextDomain(bprm, &next_domain); |
/* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ |
| 1380 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
| 1381 |
|
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
| 1382 |
|
return false; |
| 1383 |
|
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR == 3 && defined(CONFIG_MMU) |
| 1384 |
|
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
| 1385 |
|
return false; |
| 1386 |
#else |
#else |
| 1387 |
retval = 0; next_domain = prev_domain; |
page = bprm->page[pos / PAGE_SIZE]; |
| 1388 |
|
#endif |
| 1389 |
|
if (page != dump->page) { |
| 1390 |
|
const unsigned int offset = pos % PAGE_SIZE; |
| 1391 |
|
/* |
| 1392 |
|
* Maybe kmap()/kunmap() should be used here. |
| 1393 |
|
* But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). |
| 1394 |
|
* So do I. |
| 1395 |
|
*/ |
| 1396 |
|
char *kaddr = kmap_atomic(page, KM_USER0); |
| 1397 |
|
dump->page = page; |
| 1398 |
|
memcpy(dump->data + offset, kaddr + offset, PAGE_SIZE - offset); |
| 1399 |
|
kunmap_atomic(kaddr, KM_USER0); |
| 1400 |
|
} |
| 1401 |
|
/* Same with put_arg_page(page) in fs/exec.c */ |
| 1402 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
| 1403 |
|
put_page(page); |
| 1404 |
|
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR == 3 && defined(CONFIG_MMU) |
| 1405 |
|
put_page(page); |
| 1406 |
#endif |
#endif |
| 1407 |
if (retval == 0) { |
return true; |
| 1408 |
current->tomoyo_flags |= TOMOYO_CHECK_READ_FOR_OPEN_EXEC; |
} |
| 1409 |
current->domain_info = next_domain; |
|
| 1410 |
retval = search_binary_handler(bprm, regs); |
/** |
| 1411 |
if (retval < 0) current->domain_info = prev_domain; |
* ccs_fetch_next_domain - Fetch next_domain from the list. |
| 1412 |
current->tomoyo_flags &= ~TOMOYO_CHECK_READ_FOR_OPEN_EXEC; |
* |
| 1413 |
|
* Returns pointer to "struct ccs_domain_info" which will be used if execve() |
| 1414 |
|
* succeeds. This function does not return NULL. |
| 1415 |
|
*/ |
| 1416 |
|
struct ccs_domain_info *ccs_fetch_next_domain(void) |
| 1417 |
|
{ |
| 1418 |
|
struct ccs_execve_entry *ee = ccs_find_execve_entry(); |
| 1419 |
|
struct ccs_domain_info *next_domain = NULL; |
| 1420 |
|
if (ee) |
| 1421 |
|
next_domain = ee->r.domain; |
| 1422 |
|
if (!next_domain) |
| 1423 |
|
next_domain = ccs_current_domain(); |
| 1424 |
|
return next_domain; |
| 1425 |
|
} |
| 1426 |
|
|
| 1427 |
|
/** |
| 1428 |
|
* ccs_start_execve - Prepare for execve() operation. |
| 1429 |
|
* |
| 1430 |
|
* @bprm: Pointer to "struct linux_binprm". |
| 1431 |
|
* |
| 1432 |
|
* Returns 0 on success, negative value otherwise. |
| 1433 |
|
*/ |
| 1434 |
|
int ccs_start_execve(struct linux_binprm *bprm) |
| 1435 |
|
{ |
| 1436 |
|
int retval; |
| 1437 |
|
struct task_struct *task = current; |
| 1438 |
|
struct ccs_execve_entry *ee = ccs_allocate_execve_entry(); |
| 1439 |
|
if (!ccs_policy_loaded) |
| 1440 |
|
ccs_load_policy(bprm->filename); |
| 1441 |
|
if (!ee) |
| 1442 |
|
return -ENOMEM; |
| 1443 |
|
ccs_init_request_info(&ee->r, NULL, CCS_MAC_FOR_FILE); |
| 1444 |
|
ee->r.ee = ee; |
| 1445 |
|
ee->bprm = bprm; |
| 1446 |
|
ee->r.obj = &ee->obj; |
| 1447 |
|
ee->obj.path1_dentry = bprm->file->f_dentry; |
| 1448 |
|
ee->obj.path1_vfsmnt = bprm->file->f_vfsmnt; |
| 1449 |
|
/* Clear manager flag. */ |
| 1450 |
|
task->ccs_flags &= ~CCS_TASK_IS_POLICY_MANAGER; |
| 1451 |
|
if (ccs_find_execute_handler(ee, TYPE_EXECUTE_HANDLER)) { |
| 1452 |
|
retval = ccs_try_alt_exec(ee); |
| 1453 |
|
if (!retval) |
| 1454 |
|
ccs_audit_execute_handler_log(ee, true); |
| 1455 |
|
goto ok; |
| 1456 |
|
} |
| 1457 |
|
retval = ccs_find_next_domain(ee); |
| 1458 |
|
if (retval != -EPERM) |
| 1459 |
|
goto ok; |
| 1460 |
|
if (ccs_find_execute_handler(ee, TYPE_DENIED_EXECUTE_HANDLER)) { |
| 1461 |
|
retval = ccs_try_alt_exec(ee); |
| 1462 |
|
if (!retval) |
| 1463 |
|
ccs_audit_execute_handler_log(ee, false); |
| 1464 |
} |
} |
| 1465 |
|
ok: |
| 1466 |
|
if (retval < 0) |
| 1467 |
|
goto out; |
| 1468 |
|
ee->r.mode = ccs_check_flags(ee->r.domain, CCS_MAC_FOR_ENV); |
| 1469 |
|
retval = ccs_check_environ(ee); |
| 1470 |
|
if (retval < 0) |
| 1471 |
|
goto out; |
| 1472 |
|
task->ccs_flags |= CCS_CHECK_READ_FOR_OPEN_EXEC; |
| 1473 |
|
retval = 0; |
| 1474 |
|
out: |
| 1475 |
|
if (retval) |
| 1476 |
|
ccs_finish_execve(retval); |
| 1477 |
return retval; |
return retval; |
| 1478 |
} |
} |
| 1479 |
|
|
| 1480 |
/***** TOMOYO Linux end. *****/ |
/** |
| 1481 |
|
* ccs_finish_execve - Clean up execve() operation. |
| 1482 |
|
* |
| 1483 |
|
* @retval: Return code of an execve() operation. |
| 1484 |
|
* |
| 1485 |
|
* Caller holds ccs_read_lock(). |
| 1486 |
|
*/ |
| 1487 |
|
void ccs_finish_execve(int retval) |
| 1488 |
|
{ |
| 1489 |
|
struct task_struct *task = current; |
| 1490 |
|
struct ccs_execve_entry *ee = ccs_find_execve_entry(); |
| 1491 |
|
ccs_check_read_lock(); |
| 1492 |
|
task->ccs_flags &= ~CCS_CHECK_READ_FOR_OPEN_EXEC; |
| 1493 |
|
if (!ee) |
| 1494 |
|
return; |
| 1495 |
|
if (retval < 0) |
| 1496 |
|
goto out; |
| 1497 |
|
/* Proceed to next domain if execution suceeded. */ |
| 1498 |
|
task->ccs_domain_info = ee->r.domain; |
| 1499 |
|
/* Mark the current process as execute handler. */ |
| 1500 |
|
if (ee->handler) |
| 1501 |
|
task->ccs_flags |= CCS_TASK_IS_EXECUTE_HANDLER; |
| 1502 |
|
/* Mark the current process as normal process. */ |
| 1503 |
|
else |
| 1504 |
|
task->ccs_flags &= ~CCS_TASK_IS_EXECUTE_HANDLER; |
| 1505 |
|
out: |
| 1506 |
|
ccs_free_execve_entry(ee); |
| 1507 |
|
} |
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