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1045 lines
29 KiB
1045 lines
29 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* security/tomoyo/file.c |
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* |
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* Copyright (C) 2005-2011 NTT DATA CORPORATION |
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*/ |
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|
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#include "common.h" |
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#include <linux/slab.h> |
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|
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/* |
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* Mapping table from "enum tomoyo_path_acl_index" to "enum tomoyo_mac_index". |
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*/ |
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static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = { |
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[TOMOYO_TYPE_EXECUTE] = TOMOYO_MAC_FILE_EXECUTE, |
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[TOMOYO_TYPE_READ] = TOMOYO_MAC_FILE_OPEN, |
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[TOMOYO_TYPE_WRITE] = TOMOYO_MAC_FILE_OPEN, |
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[TOMOYO_TYPE_APPEND] = TOMOYO_MAC_FILE_OPEN, |
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[TOMOYO_TYPE_UNLINK] = TOMOYO_MAC_FILE_UNLINK, |
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[TOMOYO_TYPE_GETATTR] = TOMOYO_MAC_FILE_GETATTR, |
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[TOMOYO_TYPE_RMDIR] = TOMOYO_MAC_FILE_RMDIR, |
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[TOMOYO_TYPE_TRUNCATE] = TOMOYO_MAC_FILE_TRUNCATE, |
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[TOMOYO_TYPE_SYMLINK] = TOMOYO_MAC_FILE_SYMLINK, |
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[TOMOYO_TYPE_CHROOT] = TOMOYO_MAC_FILE_CHROOT, |
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[TOMOYO_TYPE_UMOUNT] = TOMOYO_MAC_FILE_UMOUNT, |
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}; |
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|
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/* |
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* Mapping table from "enum tomoyo_mkdev_acl_index" to "enum tomoyo_mac_index". |
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*/ |
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const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION] = { |
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[TOMOYO_TYPE_MKBLOCK] = TOMOYO_MAC_FILE_MKBLOCK, |
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[TOMOYO_TYPE_MKCHAR] = TOMOYO_MAC_FILE_MKCHAR, |
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}; |
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|
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/* |
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* Mapping table from "enum tomoyo_path2_acl_index" to "enum tomoyo_mac_index". |
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*/ |
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const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION] = { |
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[TOMOYO_TYPE_LINK] = TOMOYO_MAC_FILE_LINK, |
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[TOMOYO_TYPE_RENAME] = TOMOYO_MAC_FILE_RENAME, |
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[TOMOYO_TYPE_PIVOT_ROOT] = TOMOYO_MAC_FILE_PIVOT_ROOT, |
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}; |
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|
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/* |
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* Mapping table from "enum tomoyo_path_number_acl_index" to |
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* "enum tomoyo_mac_index". |
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*/ |
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const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION] = { |
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[TOMOYO_TYPE_CREATE] = TOMOYO_MAC_FILE_CREATE, |
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[TOMOYO_TYPE_MKDIR] = TOMOYO_MAC_FILE_MKDIR, |
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[TOMOYO_TYPE_MKFIFO] = TOMOYO_MAC_FILE_MKFIFO, |
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[TOMOYO_TYPE_MKSOCK] = TOMOYO_MAC_FILE_MKSOCK, |
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[TOMOYO_TYPE_IOCTL] = TOMOYO_MAC_FILE_IOCTL, |
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[TOMOYO_TYPE_CHMOD] = TOMOYO_MAC_FILE_CHMOD, |
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[TOMOYO_TYPE_CHOWN] = TOMOYO_MAC_FILE_CHOWN, |
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[TOMOYO_TYPE_CHGRP] = TOMOYO_MAC_FILE_CHGRP, |
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}; |
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|
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/** |
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* tomoyo_put_name_union - Drop reference on "struct tomoyo_name_union". |
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* |
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* @ptr: Pointer to "struct tomoyo_name_union". |
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* |
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* Returns nothing. |
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*/ |
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void tomoyo_put_name_union(struct tomoyo_name_union *ptr) |
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{ |
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tomoyo_put_group(ptr->group); |
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tomoyo_put_name(ptr->filename); |
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} |
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|
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/** |
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* tomoyo_compare_name_union - Check whether a name matches "struct tomoyo_name_union" or not. |
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* |
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* @name: Pointer to "struct tomoyo_path_info". |
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* @ptr: Pointer to "struct tomoyo_name_union". |
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* |
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* Returns "struct tomoyo_path_info" if @name matches @ptr, NULL otherwise. |
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*/ |
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const struct tomoyo_path_info * |
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tomoyo_compare_name_union(const struct tomoyo_path_info *name, |
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const struct tomoyo_name_union *ptr) |
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{ |
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if (ptr->group) |
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return tomoyo_path_matches_group(name, ptr->group); |
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if (tomoyo_path_matches_pattern(name, ptr->filename)) |
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return ptr->filename; |
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return NULL; |
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} |
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|
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/** |
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* tomoyo_put_number_union - Drop reference on "struct tomoyo_number_union". |
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* |
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* @ptr: Pointer to "struct tomoyo_number_union". |
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* |
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* Returns nothing. |
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*/ |
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void tomoyo_put_number_union(struct tomoyo_number_union *ptr) |
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{ |
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tomoyo_put_group(ptr->group); |
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} |
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|
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/** |
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* tomoyo_compare_number_union - Check whether a value matches "struct tomoyo_number_union" or not. |
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* |
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* @value: Number to check. |
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* @ptr: Pointer to "struct tomoyo_number_union". |
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* |
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* Returns true if @value matches @ptr, false otherwise. |
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*/ |
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bool tomoyo_compare_number_union(const unsigned long value, |
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const struct tomoyo_number_union *ptr) |
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{ |
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if (ptr->group) |
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return tomoyo_number_matches_group(value, value, ptr->group); |
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return value >= ptr->values[0] && value <= ptr->values[1]; |
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} |
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|
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/** |
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* tomoyo_add_slash - Add trailing '/' if needed. |
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* |
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* @buf: Pointer to "struct tomoyo_path_info". |
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* |
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* Returns nothing. |
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* |
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* @buf must be generated by tomoyo_encode() because this function does not |
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* allocate memory for adding '/'. |
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*/ |
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static void tomoyo_add_slash(struct tomoyo_path_info *buf) |
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{ |
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if (buf->is_dir) |
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return; |
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/* |
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* This is OK because tomoyo_encode() reserves space for appending "/". |
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*/ |
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strcat((char *) buf->name, "/"); |
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tomoyo_fill_path_info(buf); |
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} |
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|
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/** |
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* tomoyo_get_realpath - Get realpath. |
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* |
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* @buf: Pointer to "struct tomoyo_path_info". |
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* @path: Pointer to "struct path". |
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* |
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* Returns true on success, false otherwise. |
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*/ |
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static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, const struct path *path) |
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{ |
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buf->name = tomoyo_realpath_from_path(path); |
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if (buf->name) { |
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tomoyo_fill_path_info(buf); |
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return true; |
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} |
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return false; |
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} |
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|
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/** |
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* tomoyo_audit_path_log - Audit path request log. |
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* |
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* @r: Pointer to "struct tomoyo_request_info". |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_audit_path_log(struct tomoyo_request_info *r) |
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{ |
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return tomoyo_supervisor(r, "file %s %s\n", tomoyo_path_keyword |
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[r->param.path.operation], |
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r->param.path.filename->name); |
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} |
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|
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/** |
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* tomoyo_audit_path2_log - Audit path/path request log. |
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* |
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* @r: Pointer to "struct tomoyo_request_info". |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_audit_path2_log(struct tomoyo_request_info *r) |
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{ |
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return tomoyo_supervisor(r, "file %s %s %s\n", tomoyo_mac_keywords |
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[tomoyo_pp2mac[r->param.path2.operation]], |
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r->param.path2.filename1->name, |
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r->param.path2.filename2->name); |
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} |
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|
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/** |
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* tomoyo_audit_mkdev_log - Audit path/number/number/number request log. |
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* |
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* @r: Pointer to "struct tomoyo_request_info". |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_audit_mkdev_log(struct tomoyo_request_info *r) |
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{ |
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return tomoyo_supervisor(r, "file %s %s 0%o %u %u\n", |
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tomoyo_mac_keywords |
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[tomoyo_pnnn2mac[r->param.mkdev.operation]], |
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r->param.mkdev.filename->name, |
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r->param.mkdev.mode, r->param.mkdev.major, |
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r->param.mkdev.minor); |
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} |
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|
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/** |
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* tomoyo_audit_path_number_log - Audit path/number request log. |
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* |
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* @r: Pointer to "struct tomoyo_request_info". |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r) |
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{ |
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const u8 type = r->param.path_number.operation; |
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u8 radix; |
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char buffer[64]; |
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|
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switch (type) { |
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case TOMOYO_TYPE_CREATE: |
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case TOMOYO_TYPE_MKDIR: |
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case TOMOYO_TYPE_MKFIFO: |
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case TOMOYO_TYPE_MKSOCK: |
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case TOMOYO_TYPE_CHMOD: |
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radix = TOMOYO_VALUE_TYPE_OCTAL; |
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break; |
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case TOMOYO_TYPE_IOCTL: |
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radix = TOMOYO_VALUE_TYPE_HEXADECIMAL; |
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break; |
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default: |
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radix = TOMOYO_VALUE_TYPE_DECIMAL; |
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break; |
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} |
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tomoyo_print_ulong(buffer, sizeof(buffer), r->param.path_number.number, |
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radix); |
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return tomoyo_supervisor(r, "file %s %s %s\n", tomoyo_mac_keywords |
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[tomoyo_pn2mac[type]], |
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r->param.path_number.filename->name, buffer); |
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} |
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|
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/** |
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* tomoyo_check_path_acl - Check permission for path operation. |
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* |
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* @r: Pointer to "struct tomoyo_request_info". |
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* @ptr: Pointer to "struct tomoyo_acl_info". |
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* |
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* Returns true if granted, false otherwise. |
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* |
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* To be able to use wildcard for domain transition, this function sets |
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* matching entry on success. Since the caller holds tomoyo_read_lock(), |
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* it is safe to set matching entry. |
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*/ |
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static bool tomoyo_check_path_acl(struct tomoyo_request_info *r, |
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const struct tomoyo_acl_info *ptr) |
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{ |
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const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl), |
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head); |
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|
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if (acl->perm & (1 << r->param.path.operation)) { |
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r->param.path.matched_path = |
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tomoyo_compare_name_union(r->param.path.filename, |
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&acl->name); |
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return r->param.path.matched_path != NULL; |
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} |
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return false; |
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} |
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|
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/** |
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* tomoyo_check_path_number_acl - Check permission for path number operation. |
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* |
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* @r: Pointer to "struct tomoyo_request_info". |
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* @ptr: Pointer to "struct tomoyo_acl_info". |
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* |
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* Returns true if granted, false otherwise. |
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*/ |
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static bool tomoyo_check_path_number_acl(struct tomoyo_request_info *r, |
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const struct tomoyo_acl_info *ptr) |
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{ |
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const struct tomoyo_path_number_acl *acl = |
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container_of(ptr, typeof(*acl), head); |
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|
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return (acl->perm & (1 << r->param.path_number.operation)) && |
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tomoyo_compare_number_union(r->param.path_number.number, |
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&acl->number) && |
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tomoyo_compare_name_union(r->param.path_number.filename, |
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&acl->name); |
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} |
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|
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/** |
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* tomoyo_check_path2_acl - Check permission for path path operation. |
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* |
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* @r: Pointer to "struct tomoyo_request_info". |
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* @ptr: Pointer to "struct tomoyo_acl_info". |
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* |
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* Returns true if granted, false otherwise. |
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*/ |
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static bool tomoyo_check_path2_acl(struct tomoyo_request_info *r, |
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const struct tomoyo_acl_info *ptr) |
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{ |
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const struct tomoyo_path2_acl *acl = |
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container_of(ptr, typeof(*acl), head); |
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|
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return (acl->perm & (1 << r->param.path2.operation)) && |
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tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1) |
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&& tomoyo_compare_name_union(r->param.path2.filename2, |
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&acl->name2); |
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} |
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|
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/** |
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* tomoyo_check_mkdev_acl - Check permission for path number number number operation. |
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* |
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* @r: Pointer to "struct tomoyo_request_info". |
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* @ptr: Pointer to "struct tomoyo_acl_info". |
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* |
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* Returns true if granted, false otherwise. |
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*/ |
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static bool tomoyo_check_mkdev_acl(struct tomoyo_request_info *r, |
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const struct tomoyo_acl_info *ptr) |
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{ |
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const struct tomoyo_mkdev_acl *acl = |
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container_of(ptr, typeof(*acl), head); |
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|
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return (acl->perm & (1 << r->param.mkdev.operation)) && |
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tomoyo_compare_number_union(r->param.mkdev.mode, |
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&acl->mode) && |
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tomoyo_compare_number_union(r->param.mkdev.major, |
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&acl->major) && |
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tomoyo_compare_number_union(r->param.mkdev.minor, |
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&acl->minor) && |
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tomoyo_compare_name_union(r->param.mkdev.filename, |
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&acl->name); |
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} |
|
|
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/** |
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* tomoyo_same_path_acl - Check for duplicated "struct tomoyo_path_acl" entry. |
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* |
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* @a: Pointer to "struct tomoyo_acl_info". |
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* @b: Pointer to "struct tomoyo_acl_info". |
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* |
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* Returns true if @a == @b except permission bits, false otherwise. |
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*/ |
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static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a, |
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const struct tomoyo_acl_info *b) |
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{ |
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const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head); |
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const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head); |
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|
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return tomoyo_same_name_union(&p1->name, &p2->name); |
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} |
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|
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/** |
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* tomoyo_merge_path_acl - Merge duplicated "struct tomoyo_path_acl" entry. |
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* |
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* @a: Pointer to "struct tomoyo_acl_info". |
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* @b: Pointer to "struct tomoyo_acl_info". |
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* @is_delete: True for @a &= ~@b, false for @a |= @b. |
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* |
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* Returns true if @a is empty, false otherwise. |
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*/ |
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static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a, |
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struct tomoyo_acl_info *b, |
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const bool is_delete) |
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{ |
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u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head) |
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->perm; |
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u16 perm = READ_ONCE(*a_perm); |
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const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm; |
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|
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if (is_delete) |
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perm &= ~b_perm; |
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else |
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perm |= b_perm; |
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WRITE_ONCE(*a_perm, perm); |
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return !perm; |
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} |
|
|
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/** |
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* tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
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* |
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* @perm: Permission. |
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* @param: Pointer to "struct tomoyo_acl_param". |
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* |
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* Returns 0 on success, negative value otherwise. |
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* |
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* Caller holds tomoyo_read_lock(). |
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*/ |
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static int tomoyo_update_path_acl(const u16 perm, |
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struct tomoyo_acl_param *param) |
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{ |
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struct tomoyo_path_acl e = { |
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.head.type = TOMOYO_TYPE_PATH_ACL, |
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.perm = perm |
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}; |
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int error; |
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|
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if (!tomoyo_parse_name_union(param, &e.name)) |
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error = -EINVAL; |
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else |
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error = tomoyo_update_domain(&e.head, sizeof(e), param, |
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tomoyo_same_path_acl, |
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tomoyo_merge_path_acl); |
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tomoyo_put_name_union(&e.name); |
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return error; |
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} |
|
|
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/** |
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* tomoyo_same_mkdev_acl - Check for duplicated "struct tomoyo_mkdev_acl" entry. |
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* |
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* @a: Pointer to "struct tomoyo_acl_info". |
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* @b: Pointer to "struct tomoyo_acl_info". |
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* |
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* Returns true if @a == @b except permission bits, false otherwise. |
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*/ |
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static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a, |
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const struct tomoyo_acl_info *b) |
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{ |
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const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1), head); |
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const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2), head); |
|
|
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return tomoyo_same_name_union(&p1->name, &p2->name) && |
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tomoyo_same_number_union(&p1->mode, &p2->mode) && |
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tomoyo_same_number_union(&p1->major, &p2->major) && |
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tomoyo_same_number_union(&p1->minor, &p2->minor); |
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} |
|
|
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/** |
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* tomoyo_merge_mkdev_acl - Merge duplicated "struct tomoyo_mkdev_acl" entry. |
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* |
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* @a: Pointer to "struct tomoyo_acl_info". |
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* @b: Pointer to "struct tomoyo_acl_info". |
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* @is_delete: True for @a &= ~@b, false for @a |= @b. |
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* |
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* Returns true if @a is empty, false otherwise. |
|
*/ |
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static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a, |
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struct tomoyo_acl_info *b, |
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const bool is_delete) |
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{ |
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u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl, |
|
head)->perm; |
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u8 perm = READ_ONCE(*a_perm); |
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const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head) |
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->perm; |
|
|
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if (is_delete) |
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perm &= ~b_perm; |
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else |
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perm |= b_perm; |
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WRITE_ONCE(*a_perm, perm); |
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return !perm; |
|
} |
|
|
|
/** |
|
* tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list. |
|
* |
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* @perm: Permission. |
|
* @param: Pointer to "struct tomoyo_acl_param". |
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* |
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* Returns 0 on success, negative value otherwise. |
|
* |
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* Caller holds tomoyo_read_lock(). |
|
*/ |
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static int tomoyo_update_mkdev_acl(const u8 perm, |
|
struct tomoyo_acl_param *param) |
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{ |
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struct tomoyo_mkdev_acl e = { |
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.head.type = TOMOYO_TYPE_MKDEV_ACL, |
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.perm = perm |
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}; |
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int error; |
|
|
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if (!tomoyo_parse_name_union(param, &e.name) || |
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!tomoyo_parse_number_union(param, &e.mode) || |
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!tomoyo_parse_number_union(param, &e.major) || |
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!tomoyo_parse_number_union(param, &e.minor)) |
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error = -EINVAL; |
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else |
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error = tomoyo_update_domain(&e.head, sizeof(e), param, |
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tomoyo_same_mkdev_acl, |
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tomoyo_merge_mkdev_acl); |
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tomoyo_put_name_union(&e.name); |
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tomoyo_put_number_union(&e.mode); |
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tomoyo_put_number_union(&e.major); |
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tomoyo_put_number_union(&e.minor); |
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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". |
|
* |
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* Returns true if @a == @b except permission bits, false otherwise. |
|
*/ |
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static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a, |
|
const struct tomoyo_acl_info *b) |
|
{ |
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const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head); |
|
const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head); |
|
|
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return tomoyo_same_name_union(&p1->name1, &p2->name1) && |
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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 || !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; |
|
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; |
|
}
|
|
|