// SPDX-License-Identifier: GPL-2.0
/*
* security/tomoyo/file.c
*
* Copyright (C) 2005-2011 NTT DATA CORPORATION
*/
#include "common.h"
#include <linux/slab.h>
/*
* Mapping table from "enum tomoyo_path_acl_index" to "enum tomoyo_mac_index".
*/
static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = {
[TOMOYO_TYPE_EXECUTE] = TOMOYO_MAC_FILE_EXECUTE,
[TOMOYO_TYPE_READ] = TOMOYO_MAC_FILE_OPEN,
[TOMOYO_TYPE_WRITE] = TOMOYO_MAC_FILE_OPEN,
[TOMOYO_TYPE_APPEND] = TOMOYO_MAC_FILE_OPEN,
[TOMOYO_TYPE_UNLINK] = TOMOYO_MAC_FILE_UNLINK,
[TOMOYO_TYPE_GETATTR] = TOMOYO_MAC_FILE_GETATTR,
[TOMOYO_TYPE_RMDIR] = TOMOYO_MAC_FILE_RMDIR,
[TOMOYO_TYPE_TRUNCATE] = TOMOYO_MAC_FILE_TRUNCATE,
[TOMOYO_TYPE_SYMLINK] = TOMOYO_MAC_FILE_SYMLINK,
[TOMOYO_TYPE_CHROOT] = TOMOYO_MAC_FILE_CHROOT,
[TOMOYO_TYPE_UMOUNT] = TOMOYO_MAC_FILE_UMOUNT,
};
/*
* Mapping table from "enum tomoyo_mkdev_acl_index" to "enum tomoyo_mac_index".
*/
const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION] = {
[TOMOYO_TYPE_MKBLOCK] = TOMOYO_MAC_FILE_MKBLOCK,
[TOMOYO_TYPE_MKCHAR] = TOMOYO_MAC_FILE_MKCHAR,
};
/*
* Mapping table from "enum tomoyo_path2_acl_index" to "enum tomoyo_mac_index".
*/
const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION] = {
[TOMOYO_TYPE_LINK] = TOMOYO_MAC_FILE_LINK,
[TOMOYO_TYPE_RENAME] = TOMOYO_MAC_FILE_RENAME,
[TOMOYO_TYPE_PIVOT_ROOT] = TOMOYO_MAC_FILE_PIVOT_ROOT,
};
/*
* Mapping table from "enum tomoyo_path_number_acl_index" to
* "enum tomoyo_mac_index".
*/
const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION] = {
[TOMOYO_TYPE_CREATE] = TOMOYO_MAC_FILE_CREATE,
[TOMOYO_TYPE_MKDIR] = TOMOYO_MAC_FILE_MKDIR,
[TOMOYO_TYPE_MKFIFO] = TOMOYO_MAC_FILE_MKFIFO,
[TOMOYO_TYPE_MKSOCK] = TOMOYO_MAC_FILE_MKSOCK,
[TOMOYO_TYPE_IOCTL] = TOMOYO_MAC_FILE_IOCTL,
[TOMOYO_TYPE_CHMOD] = TOMOYO_MAC_FILE_CHMOD,
[TOMOYO_TYPE_CHOWN] = TOMOYO_MAC_FILE_CHOWN,
[TOMOYO_TYPE_CHGRP] = TOMOYO_MAC_FILE_CHGRP,
};
/**
* tomoyo_put_name_union - Drop reference on "struct tomoyo_name_union".
*
* @ptr: Pointer to "struct tomoyo_name_union".
*
* Returns nothing.
*/
void tomoyo_put_name_union(struct tomoyo_name_union *ptr)
{
tomoyo_put_group(ptr->group);
tomoyo_put_name(ptr->filename);
}
/**
* tomoyo_compare_name_union - Check whether a name matches "struct tomoyo_name_union" or not.
*
* @name: Pointer to "struct tomoyo_path_info".
* @ptr: Pointer to "struct tomoyo_name_union".
*
* Returns "struct tomoyo_path_info" if @name matches @ptr, NULL otherwise.
*/
const struct tomoyo_path_info *
tomoyo_compare_name_union(const struct tomoyo_path_info *name,
const struct tomoyo_name_union *ptr)
{
if (ptr->group)
return tomoyo_path_matches_group(name, ptr->group);
if (tomoyo_path_matches_pattern(name, ptr->filename))
return ptr->filename;
return NULL;
}
/**
* tomoyo_put_number_union - Drop reference on "struct tomoyo_number_union".
*
* @ptr: Pointer to "struct tomoyo_number_union".
*
* Returns nothing.
*/
void tomoyo_put_number_union(struct tomoyo_number_union *ptr)
{
tomoyo_put_group(ptr->group);
}
/**
* tomoyo_compare_number_union - Check whether a value matches "struct tomoyo_number_union" or not.
*
* @value: Number to check.
* @ptr: Pointer to "struct tomoyo_number_union".
*
* Returns true if @value matches @ptr, false otherwise.
*/
bool tomoyo_compare_number_union(const unsigned long value,
const struct tomoyo_number_union *ptr)
{
if (ptr->group)
return tomoyo_number_matches_group(value, value, ptr->group);
return value >= ptr->values[0] && value <= ptr->values[1];
}
/**
* tomoyo_add_slash - Add trailing '/' if needed.
*
* @buf: Pointer to "struct tomoyo_path_info".
*
* Returns nothing.
*
* @buf must be generated by tomoyo_encode() because this function does not
* allocate memory for adding '/'.
*/
static void tomoyo_add_slash(struct tomoyo_path_info *buf)
{
if (buf->is_dir)
return;
/*
* This is OK because tomoyo_encode() reserves space for appending "/".
*/
strcat((char *) buf->name, "/");
tomoyo_fill_path_info(buf);
}
/**
* tomoyo_get_realpath - Get realpath.
*
* @buf: Pointer to "struct tomoyo_path_info".
* @path: Pointer to "struct path".
*
* Returns true on success, false otherwise.
*/
static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, const struct path *path)
{
buf->name = tomoyo_realpath_from_path(path);
if (buf->name) {
tomoyo_fill_path_info(buf);
return true;
}
return false;
}
/**
* tomoyo_audit_path_log - Audit path request log.
*
* @r: Pointer to "struct tomoyo_request_info".
*
* Returns 0 on success, negative value otherwise.
*/
static int tomoyo_audit_path_log(struct tomoyo_request_info *r)
{
return tomoyo_supervisor(r, "file %s %s\n", tomoyo_path_keyword
[r->param.path.operation],
r->param.path.filename->name);
}
/**
* tomoyo_audit_path2_log - Audit path/path request log.
*
* @r: Pointer to "struct tomoyo_request_info".
*
* Returns 0 on success, negative value otherwise.
*/
static int tomoyo_audit_path2_log(struct tomoyo_request_info *r)
{
return tomoyo_supervisor(r, "file %s %s %s\n", tomoyo_mac_keywords
[tomoyo_pp2mac[r->param.path2.operation]],
r->param.path2.filename1->name,
r->param.path2.filename2->name);
}
/**
* tomoyo_audit_mkdev_log - Audit path/number/number/number request log.
*
* @r: Pointer to "struct tomoyo_request_info".
*
* Returns 0 on success, negative value otherwise.
*/
static int tomoyo_audit_mkdev_log(struct tomoyo_request_info *r)
{
return tomoyo_supervisor(r, "file %s %s 0%o %u %u\n",
tomoyo_mac_keywords
[tomoyo_pnnn2mac[r->param.mkdev.operation]],
r->param.mkdev.filename->name,
r->param.mkdev.mode, r->param.mkdev.major,
r->param.mkdev.minor);
}
/**
* tomoyo_audit_path_number_log - Audit path/number request log.
*
* @r: Pointer to "struct tomoyo_request_info".
*
* Returns 0 on success, negative value otherwise.
*/
static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r)
{
const u8 type = r->param.path_number.operation;
u8 radix;
char buffer[64];
switch (type) {
case TOMOYO_TYPE_CREATE:
case TOMOYO_TYPE_MKDIR:
case TOMOYO_TYPE_MKFIFO:
case TOMOYO_TYPE_MKSOCK:
case TOMOYO_TYPE_CHMOD:
radix = TOMOYO_VALUE_TYPE_OCTAL;
break;
case TOMOYO_TYPE_IOCTL:
radix = TOMOYO_VALUE_TYPE_HEXADECIMAL;
break;
default:
radix = TOMOYO_VALUE_TYPE_DECIMAL;
break;
}
tomoyo_print_ulong(buffer, sizeof(buffer), r->param.path_number.number,
radix);
return tomoyo_supervisor(r, "file %s %s %s\n", tomoyo_mac_keywords
[tomoyo_pn2mac[type]],
r->param.path_number.filename->name, buffer);
}
/**
* tomoyo_check_path_acl - Check permission for path operation.
*
* @r: Pointer to "struct tomoyo_request_info".
* @ptr: Pointer to "struct tomoyo_acl_info".
*
* Returns true if granted, false otherwise.
*
* To be able to use wildcard for domain transition, this function sets
* matching entry on success. Since the caller holds tomoyo_read_lock(),
* it is safe to set matching entry.
*/
static bool tomoyo_check_path_acl(struct tomoyo_request_info *r,
const struct tomoyo_acl_info *ptr)
{
const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl),
head);
if (acl->perm & (1 << r->param.path.operation)) {
r->param.path.matched_path =
tomoyo_compare_name_union(r->param.path.filename,
&acl->name);
return r->param.path.matched_path != NULL;
}
return false;
}
/**
* tomoyo_check_path_number_acl - Check permission for path number operation.
*
* @r: Pointer to "struct tomoyo_request_info".
* @ptr: Pointer to "struct tomoyo_acl_info".
*
* Returns true if granted, false otherwise.
*/
static bool tomoyo_check_path_number_acl(struct tomoyo_request_info *r,
const struct tomoyo_acl_info *ptr)
{
const struct tomoyo_path_number_acl *acl =
container_of(ptr, typeof(*acl), head);
return (acl->perm & (1 << r->param.path_number.operation)) &&
tomoyo_compare_number_union(r->param.path_number.number,
&acl->number) &&
tomoyo_compare_name_union(r->param.path_number.filename,
&acl->name);
}
/**
* tomoyo_check_path2_acl - Check permission for path path operation.
*
* @r: Pointer to "struct tomoyo_request_info".
* @ptr: Pointer to "struct tomoyo_acl_info".
*
* Returns true if granted, false otherwise.
*/
static bool tomoyo_check_path2_acl(struct tomoyo_request_info *r,
const struct tomoyo_acl_info *ptr)
{
const struct tomoyo_path2_acl *acl =
container_of(ptr, typeof(*acl), head);
return (acl->perm & (1 << r->param.path2.operation)) &&
tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1)
&& tomoyo_compare_name_union(r->param.path2.filename2,
&acl->name2);
}
/**
* tomoyo_check_mkdev_acl - Check permission for path number number number operation.
*
* @r: Pointer to "struct tomoyo_request_info".
* @ptr: Pointer to "struct tomoyo_acl_info".
*
* Returns true if granted, false otherwise.
*/
static bool tomoyo_check_mkdev_acl(struct tomoyo_request_info *r,
const struct tomoyo_acl_info *ptr)
{
const struct tomoyo_mkdev_acl *acl =
container_of(ptr, typeof(*acl), head);
return (acl->perm & (1 << r->param.mkdev.operation)) &&
tomoyo_compare_number_union(r->param.mkdev.mode,
&acl->mode) &&
tomoyo_compare_number_union(r->param.mkdev.major,
&acl->major) &&
tomoyo_compare_number_union(r->param.mkdev.minor,
&acl->minor) &&
tomoyo_compare_name_union(r->param.mkdev.filename,
&acl->name);
}
/**
* tomoyo_same_path_acl - Check for duplicated "struct tomoyo_path_acl" entry.
*
* @a: Pointer to "struct tomoyo_acl_info".
* @b: Pointer to "struct tomoyo_acl_info".
*
* Returns true if @a == @b except permission bits, false otherwise.
*/
static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a,
const struct tomoyo_acl_info *b)
{
const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head);
const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head);
return tomoyo_same_name_union(&p1->name, &p2->name);
}
/**
* tomoyo_merge_path_acl - Merge duplicated "struct tomoyo_path_acl" entry.
*
* @a: Pointer to "struct tomoyo_acl_info".
* @b: Pointer to "struct tomoyo_acl_info".
* @is_delete: True for @a &= ~@b, false for @a |= @b.
*
* Returns true if @a is empty, false otherwise.
*/
static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a,
struct tomoyo_acl_info *b,
const bool is_delete)
{
u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head)
->perm;
u16 perm = READ_ONCE(*a_perm);
const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm;
if (is_delete)
perm &= ~b_perm;
else
perm |= b_perm;
WRITE_ONCE(*a_perm, perm);
return !perm;
}
/**
* tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list.
*
* @perm: Permission.
* @param: Pointer to "struct tomoyo_acl_param".
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_update_path_acl(const u16 perm,
struct tomoyo_acl_param *param)
{
struct tomoyo_path_acl e = {
.head.type = TOMOYO_TYPE_PATH_ACL,
.perm = perm
};
int error;
if (!tomoyo_parse_name_union(param, &e.name))
error = -EINVAL;
else
error = tomoyo_update_domain(&e.head, sizeof(e), param,
tomoyo_same_path_acl,
tomoyo_merge_path_acl);
tomoyo_put_name_union(&e.name);
return error;
}
/**
* tomoyo_same_mkdev_acl - Check for duplicated "struct tomoyo_mkdev_acl" entry.
*
* @a: Pointer to "struct tomoyo_acl_info".
* @b: Pointer to "struct tomoyo_acl_info".
*
* Returns true if @a == @b except permission bits, false otherwise.
*/
static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a,
const struct tomoyo_acl_info *b)
{
const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1), head);
const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2), head);
return tomoyo_same_name_union(&p1->name, &p2->name) &&
tomoyo_same_number_union(&p1->mode, &p2->mode) &&
tomoyo_same_number_union(&p1->major, &p2->major) &&
tomoyo_same_number_union(&p1->minor, &p2->minor);
}
/**
* tomoyo_merge_mkdev_acl - Merge duplicated "struct tomoyo_mkdev_acl" entry.
*
* @a: Pointer to "struct tomoyo_acl_info".
* @b: Pointer to "struct tomoyo_acl_info".
* @is_delete: True for @a &= ~@b, false for @a |= @b.
*
* Returns true if @a is empty, false otherwise.
*/
static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a,
struct tomoyo_acl_info *b,
const bool is_delete)
{
u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl,
head)->perm;
u8 perm = READ_ONCE(*a_perm);
const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head)
->perm;
if (is_delete)
perm &= ~b_perm;
else
perm |= b_perm;
WRITE_ONCE(*a_perm, perm);
return !perm;
}
/**
* tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list.
*
* @perm: Permission.
* @param: Pointer to "struct tomoyo_acl_param".
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_update_mkdev_acl(const u8 perm,
struct tomoyo_acl_param *param)
{
struct tomoyo_mkdev_acl e = {
.head.type = TOMOYO_TYPE_MKDEV_ACL,
.perm = perm
};
int error;
if (!tomoyo_parse_name_union(param, &e.name) ||
!tomoyo_parse_number_union(param, &e.mode) ||
!tomoyo_parse_number_union(param, &e.major) ||
!tomoyo_parse_number_union(param, &e.minor))
error = -EINVAL;
else
error = tomoyo_update_domain(&e.head, sizeof(e), param,
tomoyo_same_mkdev_acl,
tomoyo_merge_mkdev_acl);
tomoyo_put_name_union(&e.name);
tomoyo_put_number_union(&e.mode);
tomoyo_put_number_union(&e.major);
tomoyo_put_number_union(&e.minor);
return error;
}
/**
* tomoyo_same_path2_acl - Check for duplicated "struct tomoyo_path2_acl" entry.
*
* @a: Pointer to "struct tomoyo_acl_info".
* @b: Pointer to "struct tomoyo_acl_info".
*
* Returns true if @a == @b except permission bits, false otherwise.
*/
static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a,
const struct tomoyo_acl_info *b)
{
const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head);
const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head);
return tomoyo_same_name_union(&p1->name1, &p2->name1) &&
tomoyo_same_name_union(&p1->name2, &p2->name2);
}
/**
* tomoyo_merge_path2_acl - Merge duplicated "struct tomoyo_path2_acl" entry.
*
* @a: Pointer to "struct tomoyo_acl_info".
* @b: Pointer to "struct tomoyo_acl_info".
* @is_delete: True for @a &= ~@b, false for @a |= @b.
*
* Returns true if @a is empty, false otherwise.
*/
static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a,
struct tomoyo_acl_info *b,
const bool is_delete)
{
u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head)
->perm;
u8 perm = READ_ONCE(*a_perm);
const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm;
if (is_delete)
perm &= ~b_perm;
else
perm |= b_perm;
WRITE_ONCE(*a_perm, perm);
return !perm;
}
/**
* tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list.
*
* @perm: Permission.
* @param: Pointer to "struct tomoyo_acl_param".
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_update_path2_acl(const u8 perm,
struct tomoyo_acl_param *param)
{
struct tomoyo_path2_acl e = {
.head.type = TOMOYO_TYPE_PATH2_ACL,
.perm = perm
};
int error;
if (!tomoyo_parse_name_union(param, &e.name1) ||
!tomoyo_parse_name_union(param, &e.name2))
error = -EINVAL;
else
error = tomoyo_update_domain(&e.head, sizeof(e), param,
tomoyo_same_path2_acl,
tomoyo_merge_path2_acl);
tomoyo_put_name_union(&e.name1);
tomoyo_put_name_union(&e.name2);
return error;
}
/**
* tomoyo_path_permission - Check permission for single path operation.
*
* @r: Pointer to "struct tomoyo_request_info".
* @operation: Type of operation.
* @filename: Filename to check.
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
const struct tomoyo_path_info *filename)
{
int error;
r->type = tomoyo_p2mac[operation];
r->mode = tomoyo_get_mode(r->domain->ns, r->profile, r->type);
if (r->mode == TOMOYO_CONFIG_DISABLED)
return 0;
r->param_type = TOMOYO_TYPE_PATH_ACL;
r->param.path.filename = filename;
r->param.path.operation = operation;
do {
tomoyo_check_acl(r, tomoyo_check_path_acl);
error = tomoyo_audit_path_log(r);
} while (error == TOMOYO_RETRY_REQUEST);
return error;
}
/**
* tomoyo_execute_permission - Check permission for execute operation.
*
* @r: Pointer to "struct tomoyo_request_info".
* @filename: Filename to check.
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
int tomoyo_execute_permission(struct tomoyo_request_info *r,
const struct tomoyo_path_info *filename)
{
/*
* Unlike other permission checks, this check is done regardless of
* profile mode settings in order to check for domain transition
* preference.
*/
r->type = TOMOYO_MAC_FILE_EXECUTE;
r->mode = tomoyo_get_mode(r->domain->ns, r->profile, r->type);
r->param_type = TOMOYO_TYPE_PATH_ACL;
r->param.path.filename = filename;
r->param.path.operation = TOMOYO_TYPE_EXECUTE;
tomoyo_check_acl(r, tomoyo_check_path_acl);
r->ee->transition = r->matched_acl && r->matched_acl->cond ?
r->matched_acl->cond->transit : NULL;
if (r->mode != TOMOYO_CONFIG_DISABLED)
return tomoyo_audit_path_log(r);
return 0;
}
/**
* tomoyo_same_path_number_acl - Check for duplicated "struct tomoyo_path_number_acl" entry.
*
* @a: Pointer to "struct tomoyo_acl_info".
* @b: Pointer to "struct tomoyo_acl_info".
*
* Returns true if @a == @b except permission bits, false otherwise.
*/
static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a,
const struct tomoyo_acl_info *b)
{
const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1),
head);
const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2),
head);
return tomoyo_same_name_union(&p1->name, &p2->name) &&
tomoyo_same_number_union(&p1->number, &p2->number);
}
/**
* tomoyo_merge_path_number_acl - Merge duplicated "struct tomoyo_path_number_acl" entry.
*
* @a: Pointer to "struct tomoyo_acl_info".
* @b: Pointer to "struct tomoyo_acl_info".
* @is_delete: True for @a &= ~@b, false for @a |= @b.
*
* Returns true if @a is empty, false otherwise.
*/
static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a,
struct tomoyo_acl_info *b,
const bool is_delete)
{
u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl,
head)->perm;
u8 perm = READ_ONCE(*a_perm);
const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head)
->perm;
if (is_delete)
perm &= ~b_perm;
else
perm |= b_perm;
WRITE_ONCE(*a_perm, perm);
return !perm;
}
/**
* tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL.
*
* @perm: Permission.
* @param: Pointer to "struct tomoyo_acl_param".
*
* Returns 0 on success, negative value otherwise.
*/
static int tomoyo_update_path_number_acl(const u8 perm,
struct tomoyo_acl_param *param)
{
struct tomoyo_path_number_acl e = {
.head.type = TOMOYO_TYPE_PATH_NUMBER_ACL,
.perm = perm
};
int error;
if (!tomoyo_parse_name_union(param, &e.name) ||
!tomoyo_parse_number_union(param, &e.number))
error = -EINVAL;
else
error = tomoyo_update_domain(&e.head, sizeof(e), param,
tomoyo_same_path_number_acl,
tomoyo_merge_path_number_acl);
tomoyo_put_name_union(&e.name);
tomoyo_put_number_union(&e.number);
return error;
}
/**
* tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp".
*
* @type: Type of operation.
* @path: Pointer to "struct path".
* @number: Number.
*
* Returns 0 on success, negative value otherwise.
*/
int tomoyo_path_number_perm(const u8 type, const struct path *path,
unsigned long number)
{
struct tomoyo_request_info r;
struct tomoyo_obj_info obj = {
.path1 = { .mnt = path->mnt, .dentry = path->dentry },
};
int error = -ENOMEM;
struct tomoyo_path_info buf;
int idx;
if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type])
== TOMOYO_CONFIG_DISABLED)
return 0;
idx = tomoyo_read_lock();
if (!tomoyo_get_realpath(&buf, path))
goto out;
r.obj = &obj;
if (type == TOMOYO_TYPE_MKDIR)
tomoyo_add_slash(&buf);
r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL;
r.param.path_number.operation = type;
r.param.path_number.filename = &buf;
r.param.path_number.number = number;
do {
tomoyo_check_acl(&r, tomoyo_check_path_number_acl);
error = tomoyo_audit_path_number_log(&r);
} while (error == TOMOYO_RETRY_REQUEST);
kfree(buf.name);
out:
tomoyo_read_unlock(idx);
if (r.mode != TOMOYO_CONFIG_ENFORCING)
error = 0;
return error;
}
/**
* tomoyo_check_open_permission - Check permission for "read" and "write".
*
* @domain: Pointer to "struct tomoyo_domain_info".
* @path: Pointer to "struct path".
* @flag: Flags for open().
*
* Returns 0 on success, negative value otherwise.
*/
int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
const struct path *path, const int flag)
{
const u8 acc_mode = ACC_MODE(flag);
int error = 0;
struct tomoyo_path_info buf;
struct tomoyo_request_info r;
struct tomoyo_obj_info obj = {
.path1 = { .mnt = path->mnt, .dentry = path->dentry },
};
int idx;
buf.name = NULL;
r.mode = TOMOYO_CONFIG_DISABLED;
idx = tomoyo_read_lock();
if (acc_mode &&
tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN)
!= TOMOYO_CONFIG_DISABLED) {
if (!tomoyo_get_realpath(&buf, path)) {
error = -ENOMEM;
goto out;
}
r.obj = &obj;
if (acc_mode & MAY_READ)
error = tomoyo_path_permission(&r, TOMOYO_TYPE_READ,
&buf);
if (!error && (acc_mode & MAY_WRITE))
error = tomoyo_path_permission(&r, (flag & O_APPEND) ?
TOMOYO_TYPE_APPEND :
TOMOYO_TYPE_WRITE,
&buf);
}
out:
kfree(buf.name);
tomoyo_read_unlock(idx);
if (r.mode != TOMOYO_CONFIG_ENFORCING)
error = 0;
return error;
}
/**
* tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "append", "chroot" and "unmount".
*
* @operation: Type of operation.
* @path: Pointer to "struct path".
* @target: Symlink's target if @operation is TOMOYO_TYPE_SYMLINK,
* NULL otherwise.
*
* Returns 0 on success, negative value otherwise.
*/
int tomoyo_path_perm(const u8 operation, const struct path *path, const char *target)
{
struct tomoyo_request_info r;
struct tomoyo_obj_info obj = {
.path1 = { .mnt = path->mnt, .dentry = path->dentry },
};
int error;
struct tomoyo_path_info buf;
bool is_enforce;
struct tomoyo_path_info symlink_target;
int idx;
if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation])
== TOMOYO_CONFIG_DISABLED)
return 0;
is_enforce = (r.mode == TOMOYO_CONFIG_ENFORCING);
error = -ENOMEM;
buf.name = NULL;
idx = tomoyo_read_lock();
if (!tomoyo_get_realpath(&buf, path))
goto out;
r.obj = &obj;
switch (operation) {
case TOMOYO_TYPE_RMDIR:
case TOMOYO_TYPE_CHROOT:
tomoyo_add_slash(&buf);
break;
case TOMOYO_TYPE_SYMLINK:
symlink_target.name = tomoyo_encode(target);
if (!symlink_target.name)
goto out;
tomoyo_fill_path_info(&symlink_target);
obj.symlink_target = &symlink_target;
break;
}
error = tomoyo_path_permission(&r, operation, &buf);
if (operation == TOMOYO_TYPE_SYMLINK)
kfree(symlink_target.name);
out:
kfree(buf.name);
tomoyo_read_unlock(idx);
if (!is_enforce)
error = 0;
return error;
}
/**
* tomoyo_mkdev_perm - Check permission for "mkblock" and "mkchar".
*
* @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK)
* @path: Pointer to "struct path".
* @mode: Create mode.
* @dev: Device number.
*
* Returns 0 on success, negative value otherwise.
*/
int tomoyo_mkdev_perm(const u8 operation, const struct path *path,
const unsigned int mode, unsigned int dev)
{
struct tomoyo_request_info r;
struct tomoyo_obj_info obj = {
.path1 = { .mnt = path->mnt, .dentry = path->dentry },
};
int error = -ENOMEM;
struct tomoyo_path_info buf;
int idx;
if (tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation])
== TOMOYO_CONFIG_DISABLED)
return 0;
idx = tomoyo_read_lock();
error = -ENOMEM;
if (tomoyo_get_realpath(&buf, path)) {
r.obj = &obj;
dev = new_decode_dev(dev);
r.param_type = TOMOYO_TYPE_MKDEV_ACL;
r.param.mkdev.filename = &buf;
r.param.mkdev.operation = operation;
r.param.mkdev.mode = mode;
r.param.mkdev.major = MAJOR(dev);
r.param.mkdev.minor = MINOR(dev);
tomoyo_check_acl(&r, tomoyo_check_mkdev_acl);
error = tomoyo_audit_mkdev_log(&r);
kfree(buf.name);
}
tomoyo_read_unlock(idx);
if (r.mode != TOMOYO_CONFIG_ENFORCING)
error = 0;
return error;
}
/**
* tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root".
*
* @operation: Type of operation.
* @path1: Pointer to "struct path".
* @path2: Pointer to "struct path".
*
* Returns 0 on success, negative value otherwise.
*/
int tomoyo_path2_perm(const u8 operation, const struct path *path1,
const struct path *path2)
{
int error = -ENOMEM;
struct tomoyo_path_info buf1;
struct tomoyo_path_info buf2;
struct tomoyo_request_info r;
struct tomoyo_obj_info obj = {
.path1 = { .mnt = path1->mnt, .dentry = path1->dentry },
.path2 = { .mnt = path2->mnt, .dentry = path2->dentry }
};
int idx;
if (tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation])
== TOMOYO_CONFIG_DISABLED)
return 0;
buf1.name = NULL;
buf2.name = NULL;
idx = tomoyo_read_lock();
if (!tomoyo_get_realpath(&buf1, path1) ||
!tomoyo_get_realpath(&buf2, path2))
goto out;
switch (operation) {
case TOMOYO_TYPE_RENAME:
case TOMOYO_TYPE_LINK:
if (!d_is_dir(path1->dentry))
break;
fallthrough;
case TOMOYO_TYPE_PIVOT_ROOT:
tomoyo_add_slash(&buf1);
tomoyo_add_slash(&buf2);
break;
}
r.obj = &obj;
r.param_type = TOMOYO_TYPE_PATH2_ACL;
r.param.path2.operation = operation;
r.param.path2.filename1 = &buf1;
r.param.path2.filename2 = &buf2;
do {
tomoyo_check_acl(&r, tomoyo_check_path2_acl);
error = tomoyo_audit_path2_log(&r);
} while (error == TOMOYO_RETRY_REQUEST);
out:
kfree(buf1.name);
kfree(buf2.name);
tomoyo_read_unlock(idx);
if (r.mode != TOMOYO_CONFIG_ENFORCING)
error = 0;
return error;
}
/**
* tomoyo_same_mount_acl - Check for duplicated "struct tomoyo_mount_acl" entry.
*
* @a: Pointer to "struct tomoyo_acl_info".
* @b: Pointer to "struct tomoyo_acl_info".
*
* Returns true if @a == @b, false otherwise.
*/
static bool tomoyo_same_mount_acl(const struct tomoyo_acl_info *a,
const struct tomoyo_acl_info *b)
{
const struct tomoyo_mount_acl *p1 = container_of(a, typeof(*p1), head);
const struct tomoyo_mount_acl *p2 = container_of(b, typeof(*p2), head);
return tomoyo_same_name_union(&p1->dev_name, &p2->dev_name) &&
tomoyo_same_name_union(&p1->dir_name, &p2->dir_name) &&
tomoyo_same_name_union(&p1->fs_type, &p2->fs_type) &&
tomoyo_same_number_union(&p1->flags, &p2->flags);
}
/**
* tomoyo_update_mount_acl - Write "struct tomoyo_mount_acl" list.
*
* @param: Pointer to "struct tomoyo_acl_param".
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_update_mount_acl(struct tomoyo_acl_param *param)
{
struct tomoyo_mount_acl e = { .head.type = TOMOYO_TYPE_MOUNT_ACL };
int error;
if (!tomoyo_parse_name_union(param, &e.dev_name) ||
!tomoyo_parse_name_union(param, &e.dir_name) ||
!tomoyo_parse_name_union(param, &e.fs_type) ||
!tomoyo_parse_number_union(param, &e.flags))
error = -EINVAL;
else
error = tomoyo_update_domain(&e.head, sizeof(e), param,
tomoyo_same_mount_acl, NULL);
tomoyo_put_name_union(&e.dev_name);
tomoyo_put_name_union(&e.dir_name);
tomoyo_put_name_union(&e.fs_type);
tomoyo_put_number_union(&e.flags);
return error;
}
/**
* tomoyo_write_file - Update file related list.
*
* @param: Pointer to "struct tomoyo_acl_param".
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
int tomoyo_write_file(struct tomoyo_acl_param *param)
{
u16 perm = 0;
u8 type;
const char *operation = tomoyo_read_token(param);
for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++)
if (tomoyo_permstr(operation, tomoyo_path_keyword[type]))
perm |= 1 << type;
if (perm)
return tomoyo_update_path_acl(perm, param);
for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++)
if (tomoyo_permstr(operation,
tomoyo_mac_keywords[tomoyo_pp2mac[type]]))
perm |= 1 << type;
if (perm)
return tomoyo_update_path2_acl(perm, param);
for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++)
if (tomoyo_permstr(operation,
tomoyo_mac_keywords[tomoyo_pn2mac[type]]))
perm |= 1 << type;
if (perm)
return tomoyo_update_path_number_acl(perm, param);
for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++)
if (tomoyo_permstr(operation,
tomoyo_mac_keywords[tomoyo_pnnn2mac[type]]))
perm |= 1 << type;
if (perm)
return tomoyo_update_mkdev_acl(perm, param);
if (tomoyo_permstr(operation,
tomoyo_mac_keywords[TOMOYO_MAC_FILE_MOUNT]))
return tomoyo_update_mount_acl(param);
return -EINVAL;
}
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