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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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484ca79c65
Commit c9e69318 "TOMOYO: Allow wildcard for execute permission." changed execute permission and domainname to accept wildcards. But tomoyo_find_next_domain() was using pathname passed to execve() rather than pathname specified by the execute permission. As a result, processes were not able to transit to domains which contain wildcards in their domainnames. This patch passes pathname specified by the execute permission back to tomoyo_find_next_domain() so that processes can transit to domains which contain wildcards in their domainnames. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
1181 lines
33 KiB
C
1181 lines
33 KiB
C
/*
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* security/tomoyo/file.c
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*
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* Pathname restriction functions.
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*
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* Copyright (C) 2005-2010 NTT DATA CORPORATION
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*/
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#include "common.h"
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#include <linux/slab.h>
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/* Keyword array for operations with one pathname. */
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const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
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[TOMOYO_TYPE_READ_WRITE] = "read/write",
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[TOMOYO_TYPE_EXECUTE] = "execute",
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[TOMOYO_TYPE_READ] = "read",
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[TOMOYO_TYPE_WRITE] = "write",
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[TOMOYO_TYPE_UNLINK] = "unlink",
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[TOMOYO_TYPE_RMDIR] = "rmdir",
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[TOMOYO_TYPE_TRUNCATE] = "truncate",
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[TOMOYO_TYPE_SYMLINK] = "symlink",
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[TOMOYO_TYPE_REWRITE] = "rewrite",
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[TOMOYO_TYPE_CHROOT] = "chroot",
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[TOMOYO_TYPE_UMOUNT] = "unmount",
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};
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/* Keyword array for operations with one pathname and three numbers. */
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const char *tomoyo_mkdev_keyword[TOMOYO_MAX_MKDEV_OPERATION] = {
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[TOMOYO_TYPE_MKBLOCK] = "mkblock",
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[TOMOYO_TYPE_MKCHAR] = "mkchar",
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};
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/* Keyword array for operations with two pathnames. */
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const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION] = {
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[TOMOYO_TYPE_LINK] = "link",
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[TOMOYO_TYPE_RENAME] = "rename",
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[TOMOYO_TYPE_PIVOT_ROOT] = "pivot_root",
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};
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/* Keyword array for operations with one pathname and one number. */
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const char *tomoyo_path_number_keyword[TOMOYO_MAX_PATH_NUMBER_OPERATION] = {
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[TOMOYO_TYPE_CREATE] = "create",
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[TOMOYO_TYPE_MKDIR] = "mkdir",
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[TOMOYO_TYPE_MKFIFO] = "mkfifo",
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[TOMOYO_TYPE_MKSOCK] = "mksock",
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[TOMOYO_TYPE_IOCTL] = "ioctl",
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[TOMOYO_TYPE_CHMOD] = "chmod",
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[TOMOYO_TYPE_CHOWN] = "chown",
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[TOMOYO_TYPE_CHGRP] = "chgrp",
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};
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static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = {
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[TOMOYO_TYPE_READ_WRITE] = TOMOYO_MAC_FILE_OPEN,
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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_UNLINK] = TOMOYO_MAC_FILE_UNLINK,
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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_REWRITE] = TOMOYO_MAC_FILE_REWRITE,
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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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static 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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static 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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static 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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void tomoyo_put_name_union(struct tomoyo_name_union *ptr)
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{
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if (!ptr)
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return;
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if (ptr->is_group)
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tomoyo_put_group(ptr->group);
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else
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tomoyo_put_name(ptr->filename);
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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->is_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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void tomoyo_put_number_union(struct tomoyo_number_union *ptr)
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{
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if (ptr && ptr->is_group)
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tomoyo_put_group(ptr->group);
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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->is_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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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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* tomoyo_strendswith - Check whether the token ends with the given token.
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*
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* @name: The token to check.
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* @tail: The token to find.
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*
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* Returns true if @name ends with @tail, false otherwise.
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*/
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static bool tomoyo_strendswith(const char *name, const char *tail)
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{
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int len;
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if (!name || !tail)
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return false;
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len = strlen(name) - strlen(tail);
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return len >= 0 && !strcmp(name + len, tail);
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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, 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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* 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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const char *operation = tomoyo_path_keyword[r->param.path.operation];
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const struct tomoyo_path_info *filename = r->param.path.filename;
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if (r->granted)
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return 0;
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tomoyo_warn_log(r, "%s %s", operation, filename->name);
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return tomoyo_supervisor(r, "allow_%s %s\n", operation,
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tomoyo_pattern(filename));
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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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const char *operation = tomoyo_path2_keyword[r->param.path2.operation];
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const struct tomoyo_path_info *filename1 = r->param.path2.filename1;
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const struct tomoyo_path_info *filename2 = r->param.path2.filename2;
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if (r->granted)
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return 0;
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tomoyo_warn_log(r, "%s %s %s", operation, filename1->name,
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filename2->name);
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return tomoyo_supervisor(r, "allow_%s %s %s\n", operation,
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tomoyo_pattern(filename1),
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tomoyo_pattern(filename2));
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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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const char *operation = tomoyo_mkdev_keyword[r->param.mkdev.operation];
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const struct tomoyo_path_info *filename = r->param.mkdev.filename;
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const unsigned int major = r->param.mkdev.major;
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const unsigned int minor = r->param.mkdev.minor;
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const unsigned int mode = r->param.mkdev.mode;
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if (r->granted)
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return 0;
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tomoyo_warn_log(r, "%s %s 0%o %u %u", operation, filename->name, mode,
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major, minor);
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return tomoyo_supervisor(r, "allow_%s %s 0%o %u %u\n", operation,
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tomoyo_pattern(filename), mode, major, minor);
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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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* @error: Error code.
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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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const struct tomoyo_path_info *filename = r->param.path_number.filename;
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const char *operation = tomoyo_path_number_keyword[type];
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char buffer[64];
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if (r->granted)
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return 0;
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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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tomoyo_warn_log(r, "%s %s %s", operation, filename->name, buffer);
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return tomoyo_supervisor(r, "allow_%s %s %s\n", operation,
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tomoyo_pattern(filename), buffer);
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}
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static bool tomoyo_same_globally_readable(const struct tomoyo_acl_head *a,
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const struct tomoyo_acl_head *b)
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{
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return container_of(a, struct tomoyo_readable_file,
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head)->filename ==
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container_of(b, struct tomoyo_readable_file,
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head)->filename;
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}
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/**
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* tomoyo_update_globally_readable_entry - Update "struct tomoyo_readable_file" list.
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*
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* @filename: Filename unconditionally permitted to open() for reading.
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* @is_delete: True if it is a delete request.
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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_globally_readable_entry(const char *filename,
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const bool is_delete)
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{
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struct tomoyo_readable_file e = { };
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int error;
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if (!tomoyo_correct_word(filename))
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return -EINVAL;
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e.filename = tomoyo_get_name(filename);
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if (!e.filename)
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return -ENOMEM;
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error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
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&tomoyo_policy_list
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[TOMOYO_ID_GLOBALLY_READABLE],
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tomoyo_same_globally_readable);
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tomoyo_put_name(e.filename);
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return error;
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}
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/**
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* tomoyo_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading.
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*
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* @filename: The filename to check.
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*
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* Returns true if any domain can open @filename for reading, false otherwise.
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*
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* Caller holds tomoyo_read_lock().
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*/
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static bool tomoyo_globally_readable_file(const struct tomoyo_path_info *
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filename)
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{
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struct tomoyo_readable_file *ptr;
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bool found = false;
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list_for_each_entry_rcu(ptr, &tomoyo_policy_list
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[TOMOYO_ID_GLOBALLY_READABLE], head.list) {
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if (!ptr->head.is_deleted &&
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tomoyo_path_matches_pattern(filename, ptr->filename)) {
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found = true;
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break;
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}
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}
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return found;
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}
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/**
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* tomoyo_write_globally_readable - Write "struct tomoyo_readable_file" list.
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*
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* @data: String to parse.
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* @is_delete: True if it is a delete request.
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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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int tomoyo_write_globally_readable(char *data, const bool is_delete)
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{
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return tomoyo_update_globally_readable_entry(data, is_delete);
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}
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static bool tomoyo_same_pattern(const struct tomoyo_acl_head *a,
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const struct tomoyo_acl_head *b)
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{
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return container_of(a, struct tomoyo_no_pattern, head)->pattern ==
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container_of(b, struct tomoyo_no_pattern, head)->pattern;
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}
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/**
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* tomoyo_update_file_pattern_entry - Update "struct tomoyo_no_pattern" list.
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*
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* @pattern: Pathname pattern.
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* @is_delete: True if it is a delete request.
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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_file_pattern_entry(const char *pattern,
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const bool is_delete)
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{
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struct tomoyo_no_pattern e = { };
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int error;
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if (!tomoyo_correct_word(pattern))
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return -EINVAL;
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e.pattern = tomoyo_get_name(pattern);
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if (!e.pattern)
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return -ENOMEM;
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error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
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&tomoyo_policy_list[TOMOYO_ID_PATTERN],
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tomoyo_same_pattern);
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tomoyo_put_name(e.pattern);
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return error;
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}
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/**
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* tomoyo_pattern - Get patterned pathname.
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*
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* @filename: The filename to find patterned pathname.
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*
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* Returns pointer to pathname pattern if matched, @filename otherwise.
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*
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* Caller holds tomoyo_read_lock().
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*/
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const char *tomoyo_pattern(const struct tomoyo_path_info *filename)
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{
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struct tomoyo_no_pattern *ptr;
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const struct tomoyo_path_info *pattern = NULL;
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list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_PATTERN],
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head.list) {
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if (ptr->head.is_deleted)
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continue;
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if (!tomoyo_path_matches_pattern(filename, ptr->pattern))
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continue;
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pattern = ptr->pattern;
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if (tomoyo_strendswith(pattern->name, "/\\*")) {
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/* Do nothing. Try to find the better match. */
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} else {
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/* This would be the better match. Use this. */
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break;
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}
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}
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if (pattern)
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filename = pattern;
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return filename->name;
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}
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/**
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* tomoyo_write_pattern - Write "struct tomoyo_no_pattern" list.
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*
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* @data: String to parse.
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* @is_delete: True if it is a delete request.
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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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int tomoyo_write_pattern(char *data, const bool is_delete)
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{
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return tomoyo_update_file_pattern_entry(data, is_delete);
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}
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static bool tomoyo_same_no_rewrite(const struct tomoyo_acl_head *a,
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const struct tomoyo_acl_head *b)
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{
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return container_of(a, struct tomoyo_no_rewrite, head)->pattern
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== container_of(b, struct tomoyo_no_rewrite, head)
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->pattern;
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}
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/**
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* tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite" list.
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*
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* @pattern: Pathname pattern that are not rewritable by default.
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* @is_delete: True if it is a delete request.
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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_no_rewrite_entry(const char *pattern,
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const bool is_delete)
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{
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struct tomoyo_no_rewrite e = { };
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int error;
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if (!tomoyo_correct_word(pattern))
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return -EINVAL;
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e.pattern = tomoyo_get_name(pattern);
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if (!e.pattern)
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return -ENOMEM;
|
|
error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
|
|
&tomoyo_policy_list[TOMOYO_ID_NO_REWRITE],
|
|
tomoyo_same_no_rewrite);
|
|
tomoyo_put_name(e.pattern);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_no_rewrite_file - Check if the given pathname is not permitted to be rewrited.
|
|
*
|
|
* @filename: Filename to check.
|
|
*
|
|
* Returns true if @filename is specified by "deny_rewrite" directive,
|
|
* false otherwise.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static bool tomoyo_no_rewrite_file(const struct tomoyo_path_info *filename)
|
|
{
|
|
struct tomoyo_no_rewrite *ptr;
|
|
bool found = false;
|
|
|
|
list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_NO_REWRITE],
|
|
head.list) {
|
|
if (ptr->head.is_deleted)
|
|
continue;
|
|
if (!tomoyo_path_matches_pattern(filename, ptr->pattern))
|
|
continue;
|
|
found = true;
|
|
break;
|
|
}
|
|
return found;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_write_no_rewrite - Write "struct tomoyo_no_rewrite" list.
|
|
*
|
|
* @data: String to parse.
|
|
* @is_delete: True if it is a delete request.
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
int tomoyo_write_no_rewrite(char *data, const bool is_delete)
|
|
{
|
|
return tomoyo_update_no_rewrite_entry(data, is_delete);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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_acl_head(&p1->head, &p2->head) &&
|
|
tomoyo_same_name_union(&p1->name, &p2->name);
|
|
}
|
|
|
|
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;
|
|
if ((perm & TOMOYO_RW_MASK) != TOMOYO_RW_MASK)
|
|
perm &= ~(1 << TOMOYO_TYPE_READ_WRITE);
|
|
else if (!(perm & (1 << TOMOYO_TYPE_READ_WRITE)))
|
|
perm &= ~TOMOYO_RW_MASK;
|
|
} else {
|
|
perm |= b_perm;
|
|
if ((perm & TOMOYO_RW_MASK) == TOMOYO_RW_MASK)
|
|
perm |= (1 << TOMOYO_TYPE_READ_WRITE);
|
|
else if (perm & (1 << TOMOYO_TYPE_READ_WRITE))
|
|
perm |= TOMOYO_RW_MASK;
|
|
}
|
|
*a_perm = perm;
|
|
return !perm;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list.
|
|
*
|
|
* @type: Type of operation.
|
|
* @filename: Filename.
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @is_delete: True if it is a delete request.
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static int tomoyo_update_path_acl(const u8 type, const char *filename,
|
|
struct tomoyo_domain_info * const domain,
|
|
const bool is_delete)
|
|
{
|
|
struct tomoyo_path_acl e = {
|
|
.head.type = TOMOYO_TYPE_PATH_ACL,
|
|
.perm = 1 << type
|
|
};
|
|
int error;
|
|
if (e.perm == (1 << TOMOYO_TYPE_READ_WRITE))
|
|
e.perm |= TOMOYO_RW_MASK;
|
|
if (!tomoyo_parse_name_union(filename, &e.name))
|
|
return -EINVAL;
|
|
error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain,
|
|
tomoyo_same_path_acl,
|
|
tomoyo_merge_path_acl);
|
|
tomoyo_put_name_union(&e.name);
|
|
return error;
|
|
}
|
|
|
|
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_acl_head(&p1->head, &p2->head)
|
|
&& 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);
|
|
}
|
|
|
|
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.
|
|
*
|
|
* @type: Type of operation.
|
|
* @filename: Filename.
|
|
* @mode: Create mode.
|
|
* @major: Device major number.
|
|
* @minor: Device minor number.
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @is_delete: True if it is a delete request.
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static int tomoyo_update_mkdev_acl(const u8 type, const char *filename,
|
|
char *mode, char *major, char *minor,
|
|
struct tomoyo_domain_info * const
|
|
domain, const bool is_delete)
|
|
{
|
|
struct tomoyo_mkdev_acl e = {
|
|
.head.type = TOMOYO_TYPE_MKDEV_ACL,
|
|
.perm = 1 << type
|
|
};
|
|
int error = is_delete ? -ENOENT : -ENOMEM;
|
|
if (!tomoyo_parse_name_union(filename, &e.name) ||
|
|
!tomoyo_parse_number_union(mode, &e.mode) ||
|
|
!tomoyo_parse_number_union(major, &e.major) ||
|
|
!tomoyo_parse_number_union(minor, &e.minor))
|
|
goto out;
|
|
error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain,
|
|
tomoyo_same_mkdev_acl,
|
|
tomoyo_merge_mkdev_acl);
|
|
out:
|
|
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;
|
|
}
|
|
|
|
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_acl_head(&p1->head, &p2->head)
|
|
&& tomoyo_same_name_union(&p1->name1, &p2->name1)
|
|
&& tomoyo_same_name_union(&p1->name2, &p2->name2);
|
|
}
|
|
|
|
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.
|
|
*
|
|
* @type: Type of operation.
|
|
* @filename1: First filename.
|
|
* @filename2: Second filename.
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @is_delete: True if it is a delete request.
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static int tomoyo_update_path2_acl(const u8 type, const char *filename1,
|
|
const char *filename2,
|
|
struct tomoyo_domain_info * const domain,
|
|
const bool is_delete)
|
|
{
|
|
struct tomoyo_path2_acl e = {
|
|
.head.type = TOMOYO_TYPE_PATH2_ACL,
|
|
.perm = 1 << type
|
|
};
|
|
int error = is_delete ? -ENOENT : -ENOMEM;
|
|
if (!tomoyo_parse_name_union(filename1, &e.name1) ||
|
|
!tomoyo_parse_name_union(filename2, &e.name2))
|
|
goto out;
|
|
error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain,
|
|
tomoyo_same_path2_acl,
|
|
tomoyo_merge_path2_acl);
|
|
out:
|
|
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().
|
|
*/
|
|
int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
|
|
const struct tomoyo_path_info *filename)
|
|
{
|
|
int error;
|
|
|
|
next:
|
|
r->type = tomoyo_p2mac[operation];
|
|
r->mode = tomoyo_get_mode(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);
|
|
if (!r->granted && operation == TOMOYO_TYPE_READ &&
|
|
!r->domain->ignore_global_allow_read &&
|
|
tomoyo_globally_readable_file(filename))
|
|
r->granted = true;
|
|
error = tomoyo_audit_path_log(r);
|
|
/*
|
|
* Do not retry for execute request, for alias may have
|
|
* changed.
|
|
*/
|
|
} while (error == TOMOYO_RETRY_REQUEST &&
|
|
operation != TOMOYO_TYPE_EXECUTE);
|
|
/*
|
|
* Since "allow_truncate" doesn't imply "allow_rewrite" permission,
|
|
* we need to check "allow_rewrite" permission if the filename is
|
|
* specified by "deny_rewrite" keyword.
|
|
*/
|
|
if (!error && operation == TOMOYO_TYPE_TRUNCATE &&
|
|
tomoyo_no_rewrite_file(filename)) {
|
|
operation = TOMOYO_TYPE_REWRITE;
|
|
goto next;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
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_acl_head(&p1->head, &p2->head)
|
|
&& tomoyo_same_name_union(&p1->name, &p2->name)
|
|
&& tomoyo_same_number_union(&p1->number, &p2->number);
|
|
}
|
|
|
|
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.
|
|
*
|
|
* @type: Type of operation.
|
|
* @filename: Filename.
|
|
* @number: Number.
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @is_delete: True if it is a delete request.
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
static int tomoyo_update_path_number_acl(const u8 type, const char *filename,
|
|
char *number,
|
|
struct tomoyo_domain_info * const
|
|
domain,
|
|
const bool is_delete)
|
|
{
|
|
struct tomoyo_path_number_acl e = {
|
|
.head.type = TOMOYO_TYPE_PATH_NUMBER_ACL,
|
|
.perm = 1 << type
|
|
};
|
|
int error = is_delete ? -ENOENT : -ENOMEM;
|
|
if (!tomoyo_parse_name_union(filename, &e.name))
|
|
return -EINVAL;
|
|
if (!tomoyo_parse_number_union(number, &e.number))
|
|
goto out;
|
|
error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain,
|
|
tomoyo_same_path_number_acl,
|
|
tomoyo_merge_path_number_acl);
|
|
out:
|
|
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, struct path *path,
|
|
unsigned long number)
|
|
{
|
|
struct tomoyo_request_info r;
|
|
int error = -ENOMEM;
|
|
struct tomoyo_path_info buf;
|
|
int idx;
|
|
|
|
if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type])
|
|
== TOMOYO_CONFIG_DISABLED || !path->mnt || !path->dentry)
|
|
return 0;
|
|
idx = tomoyo_read_lock();
|
|
if (!tomoyo_get_realpath(&buf, path))
|
|
goto out;
|
|
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,
|
|
struct path *path, const int flag)
|
|
{
|
|
const u8 acc_mode = ACC_MODE(flag);
|
|
int error = -ENOMEM;
|
|
struct tomoyo_path_info buf;
|
|
struct tomoyo_request_info r;
|
|
int idx;
|
|
|
|
if (!path->mnt ||
|
|
(path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)))
|
|
return 0;
|
|
buf.name = NULL;
|
|
r.mode = TOMOYO_CONFIG_DISABLED;
|
|
idx = tomoyo_read_lock();
|
|
if (!tomoyo_get_realpath(&buf, path))
|
|
goto out;
|
|
error = 0;
|
|
/*
|
|
* If the filename is specified by "deny_rewrite" keyword,
|
|
* we need to check "allow_rewrite" permission when the filename is not
|
|
* opened for append mode or the filename is truncated at open time.
|
|
*/
|
|
if ((acc_mode & MAY_WRITE) && !(flag & O_APPEND)
|
|
&& tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_REWRITE)
|
|
!= TOMOYO_CONFIG_DISABLED) {
|
|
if (!tomoyo_get_realpath(&buf, path)) {
|
|
error = -ENOMEM;
|
|
goto out;
|
|
}
|
|
if (tomoyo_no_rewrite_file(&buf))
|
|
error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE,
|
|
&buf);
|
|
}
|
|
if (!error && acc_mode &&
|
|
tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN)
|
|
!= TOMOYO_CONFIG_DISABLED) {
|
|
u8 operation;
|
|
if (!buf.name && !tomoyo_get_realpath(&buf, path)) {
|
|
error = -ENOMEM;
|
|
goto out;
|
|
}
|
|
if (acc_mode == (MAY_READ | MAY_WRITE))
|
|
operation = TOMOYO_TYPE_READ_WRITE;
|
|
else if (acc_mode == MAY_READ)
|
|
operation = TOMOYO_TYPE_READ;
|
|
else
|
|
operation = TOMOYO_TYPE_WRITE;
|
|
error = tomoyo_path_permission(&r, operation, &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", "rewrite", "chroot" and "unmount".
|
|
*
|
|
* @operation: Type of operation.
|
|
* @path: Pointer to "struct path".
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
int tomoyo_path_perm(const u8 operation, struct path *path)
|
|
{
|
|
int error = -ENOMEM;
|
|
struct tomoyo_path_info buf;
|
|
struct tomoyo_request_info r;
|
|
int idx;
|
|
|
|
if (!path->mnt)
|
|
return 0;
|
|
if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation])
|
|
== TOMOYO_CONFIG_DISABLED)
|
|
return 0;
|
|
buf.name = NULL;
|
|
idx = tomoyo_read_lock();
|
|
if (!tomoyo_get_realpath(&buf, path))
|
|
goto out;
|
|
switch (operation) {
|
|
case TOMOYO_TYPE_REWRITE:
|
|
if (!tomoyo_no_rewrite_file(&buf)) {
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
break;
|
|
case TOMOYO_TYPE_RMDIR:
|
|
case TOMOYO_TYPE_CHROOT:
|
|
case TOMOYO_TYPE_UMOUNT:
|
|
tomoyo_add_slash(&buf);
|
|
break;
|
|
}
|
|
error = tomoyo_path_permission(&r, operation, &buf);
|
|
out:
|
|
kfree(buf.name);
|
|
tomoyo_read_unlock(idx);
|
|
if (r.mode != TOMOYO_CONFIG_ENFORCING)
|
|
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, struct path *path,
|
|
const unsigned int mode, unsigned int dev)
|
|
{
|
|
struct tomoyo_request_info r;
|
|
int error = -ENOMEM;
|
|
struct tomoyo_path_info buf;
|
|
int idx;
|
|
|
|
if (!path->mnt ||
|
|
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)) {
|
|
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, struct path *path1,
|
|
struct path *path2)
|
|
{
|
|
int error = -ENOMEM;
|
|
struct tomoyo_path_info buf1;
|
|
struct tomoyo_path_info buf2;
|
|
struct tomoyo_request_info r;
|
|
int idx;
|
|
|
|
if (!path1->mnt || !path2->mnt ||
|
|
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) {
|
|
struct dentry *dentry;
|
|
case TOMOYO_TYPE_RENAME:
|
|
case TOMOYO_TYPE_LINK:
|
|
dentry = path1->dentry;
|
|
if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode))
|
|
break;
|
|
/* fall through */
|
|
case TOMOYO_TYPE_PIVOT_ROOT:
|
|
tomoyo_add_slash(&buf1);
|
|
tomoyo_add_slash(&buf2);
|
|
break;
|
|
}
|
|
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_write_file - Update file related list.
|
|
*
|
|
* @data: String to parse.
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
* @is_delete: True if it is a delete request.
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
int tomoyo_write_file(char *data, struct tomoyo_domain_info *domain,
|
|
const bool is_delete)
|
|
{
|
|
char *w[5];
|
|
u8 type;
|
|
if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0])
|
|
return -EINVAL;
|
|
if (strncmp(w[0], "allow_", 6))
|
|
goto out;
|
|
w[0] += 6;
|
|
for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) {
|
|
if (strcmp(w[0], tomoyo_path_keyword[type]))
|
|
continue;
|
|
return tomoyo_update_path_acl(type, w[1], domain, is_delete);
|
|
}
|
|
if (!w[2][0])
|
|
goto out;
|
|
for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) {
|
|
if (strcmp(w[0], tomoyo_path2_keyword[type]))
|
|
continue;
|
|
return tomoyo_update_path2_acl(type, w[1], w[2], domain,
|
|
is_delete);
|
|
}
|
|
for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) {
|
|
if (strcmp(w[0], tomoyo_path_number_keyword[type]))
|
|
continue;
|
|
return tomoyo_update_path_number_acl(type, w[1], w[2], domain,
|
|
is_delete);
|
|
}
|
|
if (!w[3][0] || !w[4][0])
|
|
goto out;
|
|
for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++) {
|
|
if (strcmp(w[0], tomoyo_mkdev_keyword[type]))
|
|
continue;
|
|
return tomoyo_update_mkdev_acl(type, w[1], w[2], w[3],
|
|
w[4], domain, is_delete);
|
|
}
|
|
out:
|
|
return -EINVAL;
|
|
}
|