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linux-next/security/tomoyo/file.c
Kees Cook 8291798dcf TOMOYO: Use designated initializers
Prepare to mark sensitive kernel structures for randomization by making
sure they're using designated initializers. These were identified during
allyesconfig builds of x86, arm, and arm64, with most initializer fixes
extracted from grsecurity.

Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <james.l.morris@oracle.com>
2017-03-30 17:37:45 +11:00

1025 lines
29 KiB
C

/*
* 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 = *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;
*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 = *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;
*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 = *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;
*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 = *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;
*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 || !path->dentry)
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;
/* fall through */
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;
}