879 lines
25 KiB
C
879 lines
25 KiB
C
/*
|
|
* security/tomoyo/domain.c
|
|
*
|
|
* Implementation of the Domain-Based Mandatory Access Control.
|
|
*
|
|
* Copyright (C) 2005-2009 NTT DATA CORPORATION
|
|
*
|
|
* Version: 2.2.0-pre 2009/02/01
|
|
*
|
|
*/
|
|
|
|
#include "common.h"
|
|
#include "tomoyo.h"
|
|
#include "realpath.h"
|
|
#include <linux/binfmts.h>
|
|
|
|
/* Variables definitions.*/
|
|
|
|
/* The initial domain. */
|
|
struct tomoyo_domain_info tomoyo_kernel_domain;
|
|
|
|
/* The list for "struct tomoyo_domain_info". */
|
|
LIST_HEAD(tomoyo_domain_list);
|
|
DECLARE_RWSEM(tomoyo_domain_list_lock);
|
|
|
|
/* Structure for "initialize_domain" and "no_initialize_domain" keyword. */
|
|
struct tomoyo_domain_initializer_entry {
|
|
struct list_head list;
|
|
const struct tomoyo_path_info *domainname; /* This may be NULL */
|
|
const struct tomoyo_path_info *program;
|
|
bool is_deleted;
|
|
bool is_not; /* True if this entry is "no_initialize_domain". */
|
|
/* True if the domainname is tomoyo_get_last_name(). */
|
|
bool is_last_name;
|
|
};
|
|
|
|
/* Structure for "keep_domain" and "no_keep_domain" keyword. */
|
|
struct tomoyo_domain_keeper_entry {
|
|
struct list_head list;
|
|
const struct tomoyo_path_info *domainname;
|
|
const struct tomoyo_path_info *program; /* This may be NULL */
|
|
bool is_deleted;
|
|
bool is_not; /* True if this entry is "no_keep_domain". */
|
|
/* True if the domainname is tomoyo_get_last_name(). */
|
|
bool is_last_name;
|
|
};
|
|
|
|
/* Structure for "alias" keyword. */
|
|
struct tomoyo_alias_entry {
|
|
struct list_head list;
|
|
const struct tomoyo_path_info *original_name;
|
|
const struct tomoyo_path_info *aliased_name;
|
|
bool is_deleted;
|
|
};
|
|
|
|
/**
|
|
* tomoyo_set_domain_flag - Set or clear domain's attribute flags.
|
|
*
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @is_delete: True if it is a delete request.
|
|
* @flags: Flags to set or clear.
|
|
*
|
|
* Returns nothing.
|
|
*/
|
|
void tomoyo_set_domain_flag(struct tomoyo_domain_info *domain,
|
|
const bool is_delete, const u8 flags)
|
|
{
|
|
/* We need to serialize because this is bitfield operation. */
|
|
static DEFINE_SPINLOCK(lock);
|
|
/***** CRITICAL SECTION START *****/
|
|
spin_lock(&lock);
|
|
if (!is_delete)
|
|
domain->flags |= flags;
|
|
else
|
|
domain->flags &= ~flags;
|
|
spin_unlock(&lock);
|
|
/***** CRITICAL SECTION END *****/
|
|
}
|
|
|
|
/**
|
|
* tomoyo_get_last_name - Get last component of a domainname.
|
|
*
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
*
|
|
* Returns the last component of the domainname.
|
|
*/
|
|
const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain)
|
|
{
|
|
const char *cp0 = domain->domainname->name;
|
|
const char *cp1 = strrchr(cp0, ' ');
|
|
|
|
if (cp1)
|
|
return cp1 + 1;
|
|
return cp0;
|
|
}
|
|
|
|
/* The list for "struct tomoyo_domain_initializer_entry". */
|
|
static LIST_HEAD(tomoyo_domain_initializer_list);
|
|
static DECLARE_RWSEM(tomoyo_domain_initializer_list_lock);
|
|
|
|
/**
|
|
* tomoyo_update_domain_initializer_entry - Update "struct tomoyo_domain_initializer_entry" list.
|
|
*
|
|
* @domainname: The name of domain. May be NULL.
|
|
* @program: The name of program.
|
|
* @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.
|
|
*/
|
|
static int tomoyo_update_domain_initializer_entry(const char *domainname,
|
|
const char *program,
|
|
const bool is_not,
|
|
const bool is_delete)
|
|
{
|
|
struct tomoyo_domain_initializer_entry *new_entry;
|
|
struct tomoyo_domain_initializer_entry *ptr;
|
|
const struct tomoyo_path_info *saved_program;
|
|
const struct tomoyo_path_info *saved_domainname = NULL;
|
|
int error = -ENOMEM;
|
|
bool is_last_name = false;
|
|
|
|
if (!tomoyo_is_correct_path(program, 1, -1, -1, __func__))
|
|
return -EINVAL; /* No patterns allowed. */
|
|
if (domainname) {
|
|
if (!tomoyo_is_domain_def(domainname) &&
|
|
tomoyo_is_correct_path(domainname, 1, -1, -1, __func__))
|
|
is_last_name = true;
|
|
else if (!tomoyo_is_correct_domain(domainname, __func__))
|
|
return -EINVAL;
|
|
saved_domainname = tomoyo_save_name(domainname);
|
|
if (!saved_domainname)
|
|
return -ENOMEM;
|
|
}
|
|
saved_program = tomoyo_save_name(program);
|
|
if (!saved_program)
|
|
return -ENOMEM;
|
|
/***** EXCLUSIVE SECTION START *****/
|
|
down_write(&tomoyo_domain_initializer_list_lock);
|
|
list_for_each_entry(ptr, &tomoyo_domain_initializer_list, list) {
|
|
if (ptr->is_not != is_not ||
|
|
ptr->domainname != saved_domainname ||
|
|
ptr->program != saved_program)
|
|
continue;
|
|
ptr->is_deleted = is_delete;
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
if (is_delete) {
|
|
error = -ENOENT;
|
|
goto out;
|
|
}
|
|
new_entry = tomoyo_alloc_element(sizeof(*new_entry));
|
|
if (!new_entry)
|
|
goto out;
|
|
new_entry->domainname = saved_domainname;
|
|
new_entry->program = saved_program;
|
|
new_entry->is_not = is_not;
|
|
new_entry->is_last_name = is_last_name;
|
|
list_add_tail(&new_entry->list, &tomoyo_domain_initializer_list);
|
|
error = 0;
|
|
out:
|
|
up_write(&tomoyo_domain_initializer_list_lock);
|
|
/***** EXCLUSIVE SECTION END *****/
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_read_domain_initializer_policy - Read "struct tomoyo_domain_initializer_entry" list.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*
|
|
* Returns true on success, false otherwise.
|
|
*/
|
|
bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head)
|
|
{
|
|
struct list_head *pos;
|
|
bool done = true;
|
|
|
|
down_read(&tomoyo_domain_initializer_list_lock);
|
|
list_for_each_cookie(pos, head->read_var2,
|
|
&tomoyo_domain_initializer_list) {
|
|
const char *no;
|
|
const char *from = "";
|
|
const char *domain = "";
|
|
struct tomoyo_domain_initializer_entry *ptr;
|
|
ptr = list_entry(pos, struct tomoyo_domain_initializer_entry,
|
|
list);
|
|
if (ptr->is_deleted)
|
|
continue;
|
|
no = ptr->is_not ? "no_" : "";
|
|
if (ptr->domainname) {
|
|
from = " from ";
|
|
domain = ptr->domainname->name;
|
|
}
|
|
if (!tomoyo_io_printf(head,
|
|
"%s" TOMOYO_KEYWORD_INITIALIZE_DOMAIN
|
|
"%s%s%s\n", no, ptr->program->name, from,
|
|
domain)) {
|
|
done = false;
|
|
break;
|
|
}
|
|
}
|
|
up_read(&tomoyo_domain_initializer_list_lock);
|
|
return done;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_write_domain_initializer_policy - Write "struct tomoyo_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 tomoyo_write_domain_initializer_policy(char *data, const bool is_not,
|
|
const bool is_delete)
|
|
{
|
|
char *cp = strstr(data, " from ");
|
|
|
|
if (cp) {
|
|
*cp = '\0';
|
|
return tomoyo_update_domain_initializer_entry(cp + 6, data,
|
|
is_not,
|
|
is_delete);
|
|
}
|
|
return tomoyo_update_domain_initializer_entry(NULL, data, is_not,
|
|
is_delete);
|
|
}
|
|
|
|
/**
|
|
* tomoyo_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.
|
|
*/
|
|
static bool tomoyo_is_domain_initializer(const struct tomoyo_path_info *
|
|
domainname,
|
|
const struct tomoyo_path_info *program,
|
|
const struct tomoyo_path_info *
|
|
last_name)
|
|
{
|
|
struct tomoyo_domain_initializer_entry *ptr;
|
|
bool flag = false;
|
|
|
|
down_read(&tomoyo_domain_initializer_list_lock);
|
|
list_for_each_entry(ptr, &tomoyo_domain_initializer_list, list) {
|
|
if (ptr->is_deleted)
|
|
continue;
|
|
if (ptr->domainname) {
|
|
if (!ptr->is_last_name) {
|
|
if (ptr->domainname != domainname)
|
|
continue;
|
|
} else {
|
|
if (tomoyo_pathcmp(ptr->domainname, last_name))
|
|
continue;
|
|
}
|
|
}
|
|
if (tomoyo_pathcmp(ptr->program, program))
|
|
continue;
|
|
if (ptr->is_not) {
|
|
flag = false;
|
|
break;
|
|
}
|
|
flag = true;
|
|
}
|
|
up_read(&tomoyo_domain_initializer_list_lock);
|
|
return flag;
|
|
}
|
|
|
|
/* The list for "struct tomoyo_domain_keeper_entry". */
|
|
static LIST_HEAD(tomoyo_domain_keeper_list);
|
|
static DECLARE_RWSEM(tomoyo_domain_keeper_list_lock);
|
|
|
|
/**
|
|
* tomoyo_update_domain_keeper_entry - Update "struct tomoyo_domain_keeper_entry" list.
|
|
*
|
|
* @domainname: The name of domain.
|
|
* @program: The name of program. May be NULL.
|
|
* @is_not: True if it is "no_keep_domain" entry.
|
|
* @is_delete: True if it is a delete request.
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
static int tomoyo_update_domain_keeper_entry(const char *domainname,
|
|
const char *program,
|
|
const bool is_not,
|
|
const bool is_delete)
|
|
{
|
|
struct tomoyo_domain_keeper_entry *new_entry;
|
|
struct tomoyo_domain_keeper_entry *ptr;
|
|
const struct tomoyo_path_info *saved_domainname;
|
|
const struct tomoyo_path_info *saved_program = NULL;
|
|
static DEFINE_MUTEX(lock);
|
|
int error = -ENOMEM;
|
|
bool is_last_name = false;
|
|
|
|
if (!tomoyo_is_domain_def(domainname) &&
|
|
tomoyo_is_correct_path(domainname, 1, -1, -1, __func__))
|
|
is_last_name = true;
|
|
else if (!tomoyo_is_correct_domain(domainname, __func__))
|
|
return -EINVAL;
|
|
if (program) {
|
|
if (!tomoyo_is_correct_path(program, 1, -1, -1, __func__))
|
|
return -EINVAL;
|
|
saved_program = tomoyo_save_name(program);
|
|
if (!saved_program)
|
|
return -ENOMEM;
|
|
}
|
|
saved_domainname = tomoyo_save_name(domainname);
|
|
if (!saved_domainname)
|
|
return -ENOMEM;
|
|
/***** EXCLUSIVE SECTION START *****/
|
|
down_write(&tomoyo_domain_keeper_list_lock);
|
|
list_for_each_entry(ptr, &tomoyo_domain_keeper_list, list) {
|
|
if (ptr->is_not != is_not ||
|
|
ptr->domainname != saved_domainname ||
|
|
ptr->program != saved_program)
|
|
continue;
|
|
ptr->is_deleted = is_delete;
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
if (is_delete) {
|
|
error = -ENOENT;
|
|
goto out;
|
|
}
|
|
new_entry = tomoyo_alloc_element(sizeof(*new_entry));
|
|
if (!new_entry)
|
|
goto out;
|
|
new_entry->domainname = saved_domainname;
|
|
new_entry->program = saved_program;
|
|
new_entry->is_not = is_not;
|
|
new_entry->is_last_name = is_last_name;
|
|
list_add_tail(&new_entry->list, &tomoyo_domain_keeper_list);
|
|
error = 0;
|
|
out:
|
|
up_write(&tomoyo_domain_keeper_list_lock);
|
|
/***** EXCLUSIVE SECTION END *****/
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_write_domain_keeper_policy - Write "struct tomoyo_domain_keeper_entry" list.
|
|
*
|
|
* @data: String to parse.
|
|
* @is_not: True if it is "no_keep_domain" entry.
|
|
* @is_delete: True if it is a delete request.
|
|
*
|
|
*/
|
|
int tomoyo_write_domain_keeper_policy(char *data, const bool is_not,
|
|
const bool is_delete)
|
|
{
|
|
char *cp = strstr(data, " from ");
|
|
|
|
if (cp) {
|
|
*cp = '\0';
|
|
return tomoyo_update_domain_keeper_entry(cp + 6, data, is_not,
|
|
is_delete);
|
|
}
|
|
return tomoyo_update_domain_keeper_entry(data, NULL, is_not, is_delete);
|
|
}
|
|
|
|
/**
|
|
* tomoyo_read_domain_keeper_policy - Read "struct tomoyo_domain_keeper_entry" list.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*
|
|
* Returns true on success, false otherwise.
|
|
*/
|
|
bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head)
|
|
{
|
|
struct list_head *pos;
|
|
bool done = true;
|
|
|
|
down_read(&tomoyo_domain_keeper_list_lock);
|
|
list_for_each_cookie(pos, head->read_var2,
|
|
&tomoyo_domain_keeper_list) {
|
|
struct tomoyo_domain_keeper_entry *ptr;
|
|
const char *no;
|
|
const char *from = "";
|
|
const char *program = "";
|
|
|
|
ptr = list_entry(pos, struct tomoyo_domain_keeper_entry, list);
|
|
if (ptr->is_deleted)
|
|
continue;
|
|
no = ptr->is_not ? "no_" : "";
|
|
if (ptr->program) {
|
|
from = " from ";
|
|
program = ptr->program->name;
|
|
}
|
|
if (!tomoyo_io_printf(head,
|
|
"%s" TOMOYO_KEYWORD_KEEP_DOMAIN
|
|
"%s%s%s\n", no, program, from,
|
|
ptr->domainname->name)) {
|
|
done = false;
|
|
break;
|
|
}
|
|
}
|
|
up_read(&tomoyo_domain_keeper_list_lock);
|
|
return done;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_is_domain_keeper - Check whether the given program causes domain transition suppression.
|
|
*
|
|
* @domainname: The name of domain.
|
|
* @program: The name of program.
|
|
* @last_name: The last component of @domainname.
|
|
*
|
|
* Returns true if executing @program supresses domain transition,
|
|
* false otherwise.
|
|
*/
|
|
static bool tomoyo_is_domain_keeper(const struct tomoyo_path_info *domainname,
|
|
const struct tomoyo_path_info *program,
|
|
const struct tomoyo_path_info *last_name)
|
|
{
|
|
struct tomoyo_domain_keeper_entry *ptr;
|
|
bool flag = false;
|
|
|
|
down_read(&tomoyo_domain_keeper_list_lock);
|
|
list_for_each_entry(ptr, &tomoyo_domain_keeper_list, list) {
|
|
if (ptr->is_deleted)
|
|
continue;
|
|
if (!ptr->is_last_name) {
|
|
if (ptr->domainname != domainname)
|
|
continue;
|
|
} else {
|
|
if (tomoyo_pathcmp(ptr->domainname, last_name))
|
|
continue;
|
|
}
|
|
if (ptr->program && tomoyo_pathcmp(ptr->program, program))
|
|
continue;
|
|
if (ptr->is_not) {
|
|
flag = false;
|
|
break;
|
|
}
|
|
flag = true;
|
|
}
|
|
up_read(&tomoyo_domain_keeper_list_lock);
|
|
return flag;
|
|
}
|
|
|
|
/* The list for "struct tomoyo_alias_entry". */
|
|
static LIST_HEAD(tomoyo_alias_list);
|
|
static DECLARE_RWSEM(tomoyo_alias_list_lock);
|
|
|
|
/**
|
|
* tomoyo_update_alias_entry - Update "struct tomoyo_alias_entry" list.
|
|
*
|
|
* @original_name: The original program's real name.
|
|
* @aliased_name: The symbolic program's symbolic link's name.
|
|
* @is_delete: True if it is a delete request.
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
static int tomoyo_update_alias_entry(const char *original_name,
|
|
const char *aliased_name,
|
|
const bool is_delete)
|
|
{
|
|
struct tomoyo_alias_entry *new_entry;
|
|
struct tomoyo_alias_entry *ptr;
|
|
const struct tomoyo_path_info *saved_original_name;
|
|
const struct tomoyo_path_info *saved_aliased_name;
|
|
int error = -ENOMEM;
|
|
|
|
if (!tomoyo_is_correct_path(original_name, 1, -1, -1, __func__) ||
|
|
!tomoyo_is_correct_path(aliased_name, 1, -1, -1, __func__))
|
|
return -EINVAL; /* No patterns allowed. */
|
|
saved_original_name = tomoyo_save_name(original_name);
|
|
saved_aliased_name = tomoyo_save_name(aliased_name);
|
|
if (!saved_original_name || !saved_aliased_name)
|
|
return -ENOMEM;
|
|
/***** EXCLUSIVE SECTION START *****/
|
|
down_write(&tomoyo_alias_list_lock);
|
|
list_for_each_entry(ptr, &tomoyo_alias_list, list) {
|
|
if (ptr->original_name != saved_original_name ||
|
|
ptr->aliased_name != saved_aliased_name)
|
|
continue;
|
|
ptr->is_deleted = is_delete;
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
if (is_delete) {
|
|
error = -ENOENT;
|
|
goto out;
|
|
}
|
|
new_entry = tomoyo_alloc_element(sizeof(*new_entry));
|
|
if (!new_entry)
|
|
goto out;
|
|
new_entry->original_name = saved_original_name;
|
|
new_entry->aliased_name = saved_aliased_name;
|
|
list_add_tail(&new_entry->list, &tomoyo_alias_list);
|
|
error = 0;
|
|
out:
|
|
up_write(&tomoyo_alias_list_lock);
|
|
/***** EXCLUSIVE SECTION END *****/
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_read_alias_policy - Read "struct tomoyo_alias_entry" list.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*
|
|
* Returns true on success, false otherwise.
|
|
*/
|
|
bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head)
|
|
{
|
|
struct list_head *pos;
|
|
bool done = true;
|
|
|
|
down_read(&tomoyo_alias_list_lock);
|
|
list_for_each_cookie(pos, head->read_var2, &tomoyo_alias_list) {
|
|
struct tomoyo_alias_entry *ptr;
|
|
|
|
ptr = list_entry(pos, struct tomoyo_alias_entry, list);
|
|
if (ptr->is_deleted)
|
|
continue;
|
|
if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALIAS "%s %s\n",
|
|
ptr->original_name->name,
|
|
ptr->aliased_name->name)) {
|
|
done = false;
|
|
break;
|
|
}
|
|
}
|
|
up_read(&tomoyo_alias_list_lock);
|
|
return done;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_write_alias_policy - Write "struct tomoyo_alias_entry" list.
|
|
*
|
|
* @data: String to parse.
|
|
* @is_delete: True if it is a delete request.
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
int tomoyo_write_alias_policy(char *data, const bool is_delete)
|
|
{
|
|
char *cp = strchr(data, ' ');
|
|
|
|
if (!cp)
|
|
return -EINVAL;
|
|
*cp++ = '\0';
|
|
return tomoyo_update_alias_entry(data, cp, is_delete);
|
|
}
|
|
|
|
/* Domain create/delete/undelete handler. */
|
|
|
|
/* #define TOMOYO_DEBUG_DOMAIN_UNDELETE */
|
|
|
|
/**
|
|
* tomoyo_delete_domain - Delete a domain.
|
|
*
|
|
* @domainname: The name of domain.
|
|
*
|
|
* Returns 0.
|
|
*/
|
|
int tomoyo_delete_domain(char *domainname)
|
|
{
|
|
struct tomoyo_domain_info *domain;
|
|
struct tomoyo_path_info name;
|
|
|
|
name.name = domainname;
|
|
tomoyo_fill_path_info(&name);
|
|
/***** EXCLUSIVE SECTION START *****/
|
|
down_write(&tomoyo_domain_list_lock);
|
|
#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE
|
|
printk(KERN_DEBUG "tomoyo_delete_domain %s\n", domainname);
|
|
list_for_each_entry(domain, &tomoyo_domain_list, list) {
|
|
if (tomoyo_pathcmp(domain->domainname, &name))
|
|
continue;
|
|
printk(KERN_DEBUG "List: %p %u\n", domain, domain->is_deleted);
|
|
}
|
|
#endif
|
|
/* Is there an active domain? */
|
|
list_for_each_entry(domain, &tomoyo_domain_list, list) {
|
|
struct tomoyo_domain_info *domain2;
|
|
/* Never delete tomoyo_kernel_domain */
|
|
if (domain == &tomoyo_kernel_domain)
|
|
continue;
|
|
if (domain->is_deleted ||
|
|
tomoyo_pathcmp(domain->domainname, &name))
|
|
continue;
|
|
/* Mark already deleted domains as non undeletable. */
|
|
list_for_each_entry(domain2, &tomoyo_domain_list, list) {
|
|
if (!domain2->is_deleted ||
|
|
tomoyo_pathcmp(domain2->domainname, &name))
|
|
continue;
|
|
#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE
|
|
if (domain2->is_deleted != 255)
|
|
printk(KERN_DEBUG
|
|
"Marked %p as non undeletable\n",
|
|
domain2);
|
|
#endif
|
|
domain2->is_deleted = 255;
|
|
}
|
|
/* Delete and mark active domain as undeletable. */
|
|
domain->is_deleted = 1;
|
|
#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE
|
|
printk(KERN_DEBUG "Marked %p as undeletable\n", domain);
|
|
#endif
|
|
break;
|
|
}
|
|
up_write(&tomoyo_domain_list_lock);
|
|
/***** EXCLUSIVE SECTION END *****/
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_undelete_domain - Undelete a domain.
|
|
*
|
|
* @domainname: The name of domain.
|
|
*
|
|
* Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise.
|
|
*/
|
|
struct tomoyo_domain_info *tomoyo_undelete_domain(const char *domainname)
|
|
{
|
|
struct tomoyo_domain_info *domain;
|
|
struct tomoyo_domain_info *candidate_domain = NULL;
|
|
struct tomoyo_path_info name;
|
|
|
|
name.name = domainname;
|
|
tomoyo_fill_path_info(&name);
|
|
/***** EXCLUSIVE SECTION START *****/
|
|
down_write(&tomoyo_domain_list_lock);
|
|
#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE
|
|
printk(KERN_DEBUG "tomoyo_undelete_domain %s\n", domainname);
|
|
list_for_each_entry(domain, &tomoyo_domain_list, list) {
|
|
if (tomoyo_pathcmp(domain->domainname, &name))
|
|
continue;
|
|
printk(KERN_DEBUG "List: %p %u\n", domain, domain->is_deleted);
|
|
}
|
|
#endif
|
|
list_for_each_entry(domain, &tomoyo_domain_list, list) {
|
|
if (tomoyo_pathcmp(&name, domain->domainname))
|
|
continue;
|
|
if (!domain->is_deleted) {
|
|
/* This domain is active. I can't undelete. */
|
|
candidate_domain = NULL;
|
|
#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE
|
|
printk(KERN_DEBUG "%p is active. I can't undelete.\n",
|
|
domain);
|
|
#endif
|
|
break;
|
|
}
|
|
/* Is this domain undeletable? */
|
|
if (domain->is_deleted == 1)
|
|
candidate_domain = domain;
|
|
}
|
|
if (candidate_domain) {
|
|
candidate_domain->is_deleted = 0;
|
|
#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE
|
|
printk(KERN_DEBUG "%p was undeleted.\n", candidate_domain);
|
|
#endif
|
|
}
|
|
up_write(&tomoyo_domain_list_lock);
|
|
/***** EXCLUSIVE SECTION END *****/
|
|
return candidate_domain;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_find_or_assign_new_domain - Create a domain.
|
|
*
|
|
* @domainname: The name of domain.
|
|
* @profile: Profile number to assign if the domain was newly created.
|
|
*
|
|
* Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise.
|
|
*/
|
|
struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char *
|
|
domainname,
|
|
const u8 profile)
|
|
{
|
|
struct tomoyo_domain_info *domain = NULL;
|
|
const struct tomoyo_path_info *saved_domainname;
|
|
|
|
/***** EXCLUSIVE SECTION START *****/
|
|
down_write(&tomoyo_domain_list_lock);
|
|
domain = tomoyo_find_domain(domainname);
|
|
if (domain)
|
|
goto out;
|
|
if (!tomoyo_is_correct_domain(domainname, __func__))
|
|
goto out;
|
|
saved_domainname = tomoyo_save_name(domainname);
|
|
if (!saved_domainname)
|
|
goto out;
|
|
/* Can I reuse memory of deleted domain? */
|
|
list_for_each_entry(domain, &tomoyo_domain_list, list) {
|
|
struct task_struct *p;
|
|
struct tomoyo_acl_info *ptr;
|
|
bool flag;
|
|
if (!domain->is_deleted ||
|
|
domain->domainname != saved_domainname)
|
|
continue;
|
|
flag = false;
|
|
/***** CRITICAL SECTION START *****/
|
|
read_lock(&tasklist_lock);
|
|
for_each_process(p) {
|
|
if (tomoyo_real_domain(p) != domain)
|
|
continue;
|
|
flag = true;
|
|
break;
|
|
}
|
|
read_unlock(&tasklist_lock);
|
|
/***** CRITICAL SECTION END *****/
|
|
if (flag)
|
|
continue;
|
|
#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE
|
|
printk(KERN_DEBUG "Reusing %p %s\n", domain,
|
|
domain->domainname->name);
|
|
#endif
|
|
list_for_each_entry(ptr, &domain->acl_info_list, list) {
|
|
ptr->type |= TOMOYO_ACL_DELETED;
|
|
}
|
|
tomoyo_set_domain_flag(domain, true, domain->flags);
|
|
domain->profile = profile;
|
|
domain->quota_warned = false;
|
|
mb(); /* Avoid out-of-order execution. */
|
|
domain->is_deleted = 0;
|
|
goto out;
|
|
}
|
|
/* No memory reusable. Create using new memory. */
|
|
domain = tomoyo_alloc_element(sizeof(*domain));
|
|
if (domain) {
|
|
INIT_LIST_HEAD(&domain->acl_info_list);
|
|
domain->domainname = saved_domainname;
|
|
domain->profile = profile;
|
|
list_add_tail(&domain->list, &tomoyo_domain_list);
|
|
}
|
|
out:
|
|
up_write(&tomoyo_domain_list_lock);
|
|
/***** EXCLUSIVE SECTION END *****/
|
|
return domain;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_find_next_domain - Find a domain.
|
|
*
|
|
* @bprm: Pointer to "struct linux_binprm".
|
|
* @next_domain: Pointer to pointer to "struct tomoyo_domain_info".
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
int tomoyo_find_next_domain(struct linux_binprm *bprm,
|
|
struct tomoyo_domain_info **next_domain)
|
|
{
|
|
/*
|
|
* This function assumes that the size of buffer returned by
|
|
* tomoyo_realpath() = TOMOYO_MAX_PATHNAME_LEN.
|
|
*/
|
|
struct tomoyo_page_buffer *tmp = tomoyo_alloc(sizeof(*tmp));
|
|
struct tomoyo_domain_info *old_domain = tomoyo_domain();
|
|
struct tomoyo_domain_info *domain = NULL;
|
|
const char *old_domain_name = old_domain->domainname->name;
|
|
const char *original_name = bprm->filename;
|
|
char *new_domain_name = NULL;
|
|
char *real_program_name = NULL;
|
|
char *symlink_program_name = NULL;
|
|
const u8 mode = tomoyo_check_flags(old_domain, TOMOYO_MAC_FOR_FILE);
|
|
const bool is_enforce = (mode == 3);
|
|
int retval = -ENOMEM;
|
|
struct tomoyo_path_info r; /* real name */
|
|
struct tomoyo_path_info s; /* symlink name */
|
|
struct tomoyo_path_info l; /* last name */
|
|
static bool initialized;
|
|
|
|
if (!tmp)
|
|
goto out;
|
|
|
|
if (!initialized) {
|
|
/*
|
|
* Built-in initializers. This is needed because policies are
|
|
* not loaded until starting /sbin/init.
|
|
*/
|
|
tomoyo_update_domain_initializer_entry(NULL, "/sbin/hotplug",
|
|
false, false);
|
|
tomoyo_update_domain_initializer_entry(NULL, "/sbin/modprobe",
|
|
false, false);
|
|
initialized = true;
|
|
}
|
|
|
|
/* Get tomoyo_realpath of program. */
|
|
retval = -ENOENT;
|
|
/* I hope tomoyo_realpath() won't fail with -ENOMEM. */
|
|
real_program_name = tomoyo_realpath(original_name);
|
|
if (!real_program_name)
|
|
goto out;
|
|
/* Get tomoyo_realpath of symbolic link. */
|
|
symlink_program_name = tomoyo_realpath_nofollow(original_name);
|
|
if (!symlink_program_name)
|
|
goto out;
|
|
|
|
r.name = real_program_name;
|
|
tomoyo_fill_path_info(&r);
|
|
s.name = symlink_program_name;
|
|
tomoyo_fill_path_info(&s);
|
|
l.name = tomoyo_get_last_name(old_domain);
|
|
tomoyo_fill_path_info(&l);
|
|
|
|
/* Check 'alias' directive. */
|
|
if (tomoyo_pathcmp(&r, &s)) {
|
|
struct tomoyo_alias_entry *ptr;
|
|
/* Is this program allowed to be called via symbolic links? */
|
|
down_read(&tomoyo_alias_list_lock);
|
|
list_for_each_entry(ptr, &tomoyo_alias_list, list) {
|
|
if (ptr->is_deleted ||
|
|
tomoyo_pathcmp(&r, ptr->original_name) ||
|
|
tomoyo_pathcmp(&s, ptr->aliased_name))
|
|
continue;
|
|
memset(real_program_name, 0, TOMOYO_MAX_PATHNAME_LEN);
|
|
strncpy(real_program_name, ptr->aliased_name->name,
|
|
TOMOYO_MAX_PATHNAME_LEN - 1);
|
|
tomoyo_fill_path_info(&r);
|
|
break;
|
|
}
|
|
up_read(&tomoyo_alias_list_lock);
|
|
}
|
|
|
|
/* Check execute permission. */
|
|
retval = tomoyo_check_exec_perm(old_domain, &r, tmp);
|
|
if (retval < 0)
|
|
goto out;
|
|
|
|
new_domain_name = tmp->buffer;
|
|
if (tomoyo_is_domain_initializer(old_domain->domainname, &r, &l)) {
|
|
/* Transit to the child of tomoyo_kernel_domain domain. */
|
|
snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1,
|
|
TOMOYO_ROOT_NAME " " "%s", real_program_name);
|
|
} else if (old_domain == &tomoyo_kernel_domain &&
|
|
!tomoyo_policy_loaded) {
|
|
/*
|
|
* 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 = old_domain;
|
|
} else if (tomoyo_is_domain_keeper(old_domain->domainname, &r, &l)) {
|
|
/* Keep current domain. */
|
|
domain = old_domain;
|
|
} else {
|
|
/* Normal domain transition. */
|
|
snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1,
|
|
"%s %s", old_domain_name, real_program_name);
|
|
}
|
|
if (domain || strlen(new_domain_name) >= TOMOYO_MAX_PATHNAME_LEN)
|
|
goto done;
|
|
down_read(&tomoyo_domain_list_lock);
|
|
domain = tomoyo_find_domain(new_domain_name);
|
|
up_read(&tomoyo_domain_list_lock);
|
|
if (domain)
|
|
goto done;
|
|
if (is_enforce)
|
|
goto done;
|
|
domain = tomoyo_find_or_assign_new_domain(new_domain_name,
|
|
old_domain->profile);
|
|
done:
|
|
if (domain)
|
|
goto out;
|
|
printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n",
|
|
new_domain_name);
|
|
if (is_enforce)
|
|
retval = -EPERM;
|
|
else
|
|
tomoyo_set_domain_flag(old_domain, false,
|
|
TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED);
|
|
out:
|
|
tomoyo_free(real_program_name);
|
|
tomoyo_free(symlink_program_name);
|
|
*next_domain = domain ? domain : old_domain;
|
|
tomoyo_free(tmp);
|
|
return retval;
|
|
}
|