mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 10:16:49 +07:00
2a086e5d3a
In tomoyo_write_profile() since 2.6.34, a lock was by error missing when replacing profile's comment line. If multiple threads attempted echo '0-COMMENT=comment' > /sys/kernel/security/tomoyo/profile in parallel, garbage collector will fail to kfree() the old value. Protect the replacement using a lock. Also, keep the old value rather than replace with empty string when out of memory error has occurred. Signed-off-by: Xiaochen Wang <wangxiaochen0@gmail.com> Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
2083 lines
55 KiB
C
2083 lines
55 KiB
C
/*
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* security/tomoyo/common.c
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*
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* Common functions for TOMOYO.
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*
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* Copyright (C) 2005-2010 NTT DATA CORPORATION
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*/
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#include <linux/uaccess.h>
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#include <linux/slab.h>
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#include <linux/security.h>
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#include "common.h"
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static struct tomoyo_profile tomoyo_default_profile = {
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.learning = &tomoyo_default_profile.preference,
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.permissive = &tomoyo_default_profile.preference,
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.enforcing = &tomoyo_default_profile.preference,
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.preference.enforcing_verbose = true,
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.preference.learning_max_entry = 2048,
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.preference.learning_verbose = false,
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.preference.permissive_verbose = true
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};
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/* Profile version. Currently only 20090903 is defined. */
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static unsigned int tomoyo_profile_version;
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/* Profile table. Memory is allocated as needed. */
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static struct tomoyo_profile *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES];
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/* String table for functionality that takes 4 modes. */
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static const char *tomoyo_mode[4] = {
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"disabled", "learning", "permissive", "enforcing"
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};
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/* String table for /sys/kernel/security/tomoyo/profile */
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static const char *tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
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+ TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
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[TOMOYO_MAC_FILE_EXECUTE] = "file::execute",
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[TOMOYO_MAC_FILE_OPEN] = "file::open",
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[TOMOYO_MAC_FILE_CREATE] = "file::create",
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[TOMOYO_MAC_FILE_UNLINK] = "file::unlink",
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[TOMOYO_MAC_FILE_MKDIR] = "file::mkdir",
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[TOMOYO_MAC_FILE_RMDIR] = "file::rmdir",
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[TOMOYO_MAC_FILE_MKFIFO] = "file::mkfifo",
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[TOMOYO_MAC_FILE_MKSOCK] = "file::mksock",
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[TOMOYO_MAC_FILE_TRUNCATE] = "file::truncate",
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[TOMOYO_MAC_FILE_SYMLINK] = "file::symlink",
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[TOMOYO_MAC_FILE_REWRITE] = "file::rewrite",
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[TOMOYO_MAC_FILE_MKBLOCK] = "file::mkblock",
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[TOMOYO_MAC_FILE_MKCHAR] = "file::mkchar",
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[TOMOYO_MAC_FILE_LINK] = "file::link",
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[TOMOYO_MAC_FILE_RENAME] = "file::rename",
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[TOMOYO_MAC_FILE_CHMOD] = "file::chmod",
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[TOMOYO_MAC_FILE_CHOWN] = "file::chown",
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[TOMOYO_MAC_FILE_CHGRP] = "file::chgrp",
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[TOMOYO_MAC_FILE_IOCTL] = "file::ioctl",
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[TOMOYO_MAC_FILE_CHROOT] = "file::chroot",
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[TOMOYO_MAC_FILE_MOUNT] = "file::mount",
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[TOMOYO_MAC_FILE_UMOUNT] = "file::umount",
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[TOMOYO_MAC_FILE_PIVOT_ROOT] = "file::pivot_root",
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[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
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};
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/* Permit policy management by non-root user? */
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static bool tomoyo_manage_by_non_root;
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/* Utility functions. */
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/**
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* tomoyo_yesno - Return "yes" or "no".
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*
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* @value: Bool value.
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*/
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static const char *tomoyo_yesno(const unsigned int value)
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{
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return value ? "yes" : "no";
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}
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static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
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{
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va_list args;
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const int pos = strlen(buffer);
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va_start(args, fmt);
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vsnprintf(buffer + pos, len - pos - 1, fmt, args);
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va_end(args);
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}
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/**
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* tomoyo_flush - Flush queued string to userspace's buffer.
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*
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* @head: Pointer to "struct tomoyo_io_buffer".
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*
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* Returns true if all data was flushed, false otherwise.
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*/
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static bool tomoyo_flush(struct tomoyo_io_buffer *head)
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{
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while (head->r.w_pos) {
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const char *w = head->r.w[0];
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int len = strlen(w);
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if (len) {
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if (len > head->read_user_buf_avail)
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len = head->read_user_buf_avail;
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if (!len)
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return false;
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if (copy_to_user(head->read_user_buf, w, len))
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return false;
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head->read_user_buf_avail -= len;
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head->read_user_buf += len;
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w += len;
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}
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if (*w) {
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head->r.w[0] = w;
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return false;
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}
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/* Add '\0' for query. */
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if (head->poll) {
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if (!head->read_user_buf_avail ||
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copy_to_user(head->read_user_buf, "", 1))
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return false;
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head->read_user_buf_avail--;
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head->read_user_buf++;
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}
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head->r.w_pos--;
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for (len = 0; len < head->r.w_pos; len++)
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head->r.w[len] = head->r.w[len + 1];
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}
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head->r.avail = 0;
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return true;
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}
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/**
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* tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
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*
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* @head: Pointer to "struct tomoyo_io_buffer".
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* @string: String to print.
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*
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* Note that @string has to be kept valid until @head is kfree()d.
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* This means that char[] allocated on stack memory cannot be passed to
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* this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
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*/
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static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
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{
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if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
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head->r.w[head->r.w_pos++] = string;
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tomoyo_flush(head);
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} else
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WARN_ON(1);
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}
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/**
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* tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
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*
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* @head: Pointer to "struct tomoyo_io_buffer".
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* @fmt: The printf()'s format string, followed by parameters.
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*/
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void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
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{
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va_list args;
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int len;
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int pos = head->r.avail;
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int size = head->readbuf_size - pos;
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if (size <= 0)
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return;
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va_start(args, fmt);
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len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
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va_end(args);
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if (pos + len >= head->readbuf_size) {
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WARN_ON(1);
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return;
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}
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head->r.avail += len;
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tomoyo_set_string(head, head->read_buf + pos);
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}
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static void tomoyo_set_space(struct tomoyo_io_buffer *head)
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{
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tomoyo_set_string(head, " ");
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}
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static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
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{
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tomoyo_set_string(head, "\n");
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return !head->r.w_pos;
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}
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/**
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* tomoyo_print_name_union - Print a tomoyo_name_union.
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*
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* @head: Pointer to "struct tomoyo_io_buffer".
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* @ptr: Pointer to "struct tomoyo_name_union".
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*/
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static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
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const struct tomoyo_name_union *ptr)
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{
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tomoyo_set_space(head);
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if (ptr->is_group) {
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tomoyo_set_string(head, "@");
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tomoyo_set_string(head, ptr->group->group_name->name);
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} else {
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tomoyo_set_string(head, ptr->filename->name);
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}
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}
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/**
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* tomoyo_print_number_union - Print a tomoyo_number_union.
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*
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* @head: Pointer to "struct tomoyo_io_buffer".
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* @ptr: Pointer to "struct tomoyo_number_union".
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*/
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static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
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const struct tomoyo_number_union *ptr)
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{
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tomoyo_set_space(head);
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if (ptr->is_group) {
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tomoyo_set_string(head, "@");
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tomoyo_set_string(head, ptr->group->group_name->name);
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} else {
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int i;
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unsigned long min = ptr->values[0];
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const unsigned long max = ptr->values[1];
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u8 min_type = ptr->min_type;
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const u8 max_type = ptr->max_type;
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char buffer[128];
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buffer[0] = '\0';
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for (i = 0; i < 2; i++) {
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switch (min_type) {
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case TOMOYO_VALUE_TYPE_HEXADECIMAL:
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tomoyo_addprintf(buffer, sizeof(buffer),
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"0x%lX", min);
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break;
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case TOMOYO_VALUE_TYPE_OCTAL:
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tomoyo_addprintf(buffer, sizeof(buffer),
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"0%lo", min);
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break;
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default:
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tomoyo_addprintf(buffer, sizeof(buffer),
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"%lu", min);
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break;
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}
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if (min == max && min_type == max_type)
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break;
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tomoyo_addprintf(buffer, sizeof(buffer), "-");
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min_type = max_type;
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min = max;
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}
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tomoyo_io_printf(head, "%s", buffer);
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}
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}
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/**
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* tomoyo_assign_profile - Create a new profile.
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*
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* @profile: Profile number to create.
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*
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* Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
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*/
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static struct tomoyo_profile *tomoyo_assign_profile(const unsigned int profile)
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{
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struct tomoyo_profile *ptr;
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struct tomoyo_profile *entry;
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if (profile >= TOMOYO_MAX_PROFILES)
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return NULL;
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ptr = tomoyo_profile_ptr[profile];
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if (ptr)
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return ptr;
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entry = kzalloc(sizeof(*entry), GFP_NOFS);
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if (mutex_lock_interruptible(&tomoyo_policy_lock))
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goto out;
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ptr = tomoyo_profile_ptr[profile];
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if (!ptr && tomoyo_memory_ok(entry)) {
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ptr = entry;
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ptr->learning = &tomoyo_default_profile.preference;
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ptr->permissive = &tomoyo_default_profile.preference;
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ptr->enforcing = &tomoyo_default_profile.preference;
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ptr->default_config = TOMOYO_CONFIG_DISABLED;
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memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
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sizeof(ptr->config));
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mb(); /* Avoid out-of-order execution. */
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tomoyo_profile_ptr[profile] = ptr;
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entry = NULL;
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}
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mutex_unlock(&tomoyo_policy_lock);
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out:
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kfree(entry);
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return ptr;
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}
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/**
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* tomoyo_profile - Find a profile.
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*
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* @profile: Profile number to find.
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*
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* Returns pointer to "struct tomoyo_profile".
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*/
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struct tomoyo_profile *tomoyo_profile(const u8 profile)
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{
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struct tomoyo_profile *ptr = tomoyo_profile_ptr[profile];
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if (!tomoyo_policy_loaded)
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return &tomoyo_default_profile;
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BUG_ON(!ptr);
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return ptr;
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}
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static s8 tomoyo_find_yesno(const char *string, const char *find)
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{
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const char *cp = strstr(string, find);
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if (cp) {
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cp += strlen(find);
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if (!strncmp(cp, "=yes", 4))
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return 1;
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else if (!strncmp(cp, "=no", 3))
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return 0;
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}
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return -1;
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}
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static void tomoyo_set_bool(bool *b, const char *string, const char *find)
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{
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switch (tomoyo_find_yesno(string, find)) {
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case 1:
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*b = true;
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break;
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case 0:
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*b = false;
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break;
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}
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}
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static void tomoyo_set_uint(unsigned int *i, const char *string,
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const char *find)
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{
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const char *cp = strstr(string, find);
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if (cp)
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sscanf(cp + strlen(find), "=%u", i);
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}
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static void tomoyo_set_pref(const char *name, const char *value,
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const bool use_default,
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struct tomoyo_profile *profile)
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{
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struct tomoyo_preference **pref;
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bool *verbose;
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if (!strcmp(name, "enforcing")) {
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if (use_default) {
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pref = &profile->enforcing;
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goto set_default;
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}
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profile->enforcing = &profile->preference;
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verbose = &profile->preference.enforcing_verbose;
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goto set_verbose;
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}
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if (!strcmp(name, "permissive")) {
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if (use_default) {
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pref = &profile->permissive;
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goto set_default;
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}
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profile->permissive = &profile->preference;
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verbose = &profile->preference.permissive_verbose;
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goto set_verbose;
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}
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if (!strcmp(name, "learning")) {
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if (use_default) {
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pref = &profile->learning;
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goto set_default;
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}
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profile->learning = &profile->preference;
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tomoyo_set_uint(&profile->preference.learning_max_entry, value,
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"max_entry");
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verbose = &profile->preference.learning_verbose;
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goto set_verbose;
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}
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return;
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set_default:
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*pref = &tomoyo_default_profile.preference;
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return;
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set_verbose:
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tomoyo_set_bool(verbose, value, "verbose");
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}
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static int tomoyo_set_mode(char *name, const char *value,
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const bool use_default,
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struct tomoyo_profile *profile)
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{
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u8 i;
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u8 config;
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if (!strcmp(name, "CONFIG")) {
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i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
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config = profile->default_config;
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} else if (tomoyo_str_starts(&name, "CONFIG::")) {
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config = 0;
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for (i = 0; i < TOMOYO_MAX_MAC_INDEX
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+ TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
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if (strcmp(name, tomoyo_mac_keywords[i]))
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continue;
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config = profile->config[i];
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break;
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}
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if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
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return -EINVAL;
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} else {
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return -EINVAL;
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}
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if (use_default) {
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config = TOMOYO_CONFIG_USE_DEFAULT;
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} else {
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u8 mode;
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for (mode = 0; mode < 4; mode++)
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if (strstr(value, tomoyo_mode[mode]))
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/*
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* Update lower 3 bits in order to distinguish
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* 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
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*/
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config = (config & ~7) | mode;
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}
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if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
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profile->config[i] = config;
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else if (config != TOMOYO_CONFIG_USE_DEFAULT)
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profile->default_config = config;
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return 0;
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}
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/**
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* tomoyo_write_profile - Write profile table.
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*
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* @head: Pointer to "struct tomoyo_io_buffer".
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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_write_profile(struct tomoyo_io_buffer *head)
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{
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char *data = head->write_buf;
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unsigned int i;
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bool use_default = false;
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char *cp;
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struct tomoyo_profile *profile;
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if (sscanf(data, "PROFILE_VERSION=%u", &tomoyo_profile_version) == 1)
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return 0;
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i = simple_strtoul(data, &cp, 10);
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if (data == cp) {
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profile = &tomoyo_default_profile;
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} else {
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if (*cp != '-')
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return -EINVAL;
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data = cp + 1;
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profile = tomoyo_assign_profile(i);
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if (!profile)
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return -EINVAL;
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}
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cp = strchr(data, '=');
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if (!cp)
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return -EINVAL;
|
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*cp++ = '\0';
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if (profile != &tomoyo_default_profile)
|
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use_default = strstr(cp, "use_default") != NULL;
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if (tomoyo_str_starts(&data, "PREFERENCE::")) {
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tomoyo_set_pref(data, cp, use_default, profile);
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return 0;
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}
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if (profile == &tomoyo_default_profile)
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return -EINVAL;
|
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if (!strcmp(data, "COMMENT")) {
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static DEFINE_SPINLOCK(lock);
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const struct tomoyo_path_info *new_comment
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= tomoyo_get_name(cp);
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const struct tomoyo_path_info *old_comment;
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if (!new_comment)
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return -ENOMEM;
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spin_lock(&lock);
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old_comment = profile->comment;
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profile->comment = new_comment;
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spin_unlock(&lock);
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tomoyo_put_name(old_comment);
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return 0;
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}
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return tomoyo_set_mode(data, cp, use_default, profile);
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}
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|
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static void tomoyo_print_preference(struct tomoyo_io_buffer *head,
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const int idx)
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{
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struct tomoyo_preference *pref = &tomoyo_default_profile.preference;
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const struct tomoyo_profile *profile = idx >= 0 ?
|
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tomoyo_profile_ptr[idx] : NULL;
|
|
char buffer[16] = "";
|
|
if (profile) {
|
|
buffer[sizeof(buffer) - 1] = '\0';
|
|
snprintf(buffer, sizeof(buffer) - 1, "%u-", idx);
|
|
}
|
|
if (profile) {
|
|
pref = profile->learning;
|
|
if (pref == &tomoyo_default_profile.preference)
|
|
goto skip1;
|
|
}
|
|
tomoyo_io_printf(head, "%sPREFERENCE::%s={ "
|
|
"verbose=%s max_entry=%u }\n",
|
|
buffer, "learning",
|
|
tomoyo_yesno(pref->learning_verbose),
|
|
pref->learning_max_entry);
|
|
skip1:
|
|
if (profile) {
|
|
pref = profile->permissive;
|
|
if (pref == &tomoyo_default_profile.preference)
|
|
goto skip2;
|
|
}
|
|
tomoyo_io_printf(head, "%sPREFERENCE::%s={ verbose=%s }\n",
|
|
buffer, "permissive",
|
|
tomoyo_yesno(pref->permissive_verbose));
|
|
skip2:
|
|
if (profile) {
|
|
pref = profile->enforcing;
|
|
if (pref == &tomoyo_default_profile.preference)
|
|
return;
|
|
}
|
|
tomoyo_io_printf(head, "%sPREFERENCE::%s={ verbose=%s }\n",
|
|
buffer, "enforcing",
|
|
tomoyo_yesno(pref->enforcing_verbose));
|
|
}
|
|
|
|
static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
|
|
{
|
|
tomoyo_io_printf(head, "={ mode=%s }\n", tomoyo_mode[config & 3]);
|
|
}
|
|
|
|
/**
|
|
* tomoyo_read_profile - Read profile table.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*/
|
|
static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
|
|
{
|
|
u8 index;
|
|
const struct tomoyo_profile *profile;
|
|
next:
|
|
index = head->r.index;
|
|
profile = tomoyo_profile_ptr[index];
|
|
switch (head->r.step) {
|
|
case 0:
|
|
tomoyo_io_printf(head, "PROFILE_VERSION=%s\n", "20090903");
|
|
tomoyo_print_preference(head, -1);
|
|
head->r.step++;
|
|
break;
|
|
case 1:
|
|
for ( ; head->r.index < TOMOYO_MAX_PROFILES;
|
|
head->r.index++)
|
|
if (tomoyo_profile_ptr[head->r.index])
|
|
break;
|
|
if (head->r.index == TOMOYO_MAX_PROFILES)
|
|
return;
|
|
head->r.step++;
|
|
break;
|
|
case 2:
|
|
{
|
|
const struct tomoyo_path_info *comment =
|
|
profile->comment;
|
|
tomoyo_io_printf(head, "%u-COMMENT=", index);
|
|
tomoyo_set_string(head, comment ? comment->name : "");
|
|
tomoyo_set_lf(head);
|
|
head->r.step++;
|
|
}
|
|
break;
|
|
case 3:
|
|
{
|
|
tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
|
|
tomoyo_print_config(head, profile->default_config);
|
|
head->r.bit = 0;
|
|
head->r.step++;
|
|
}
|
|
break;
|
|
case 4:
|
|
for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
|
|
+ TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
|
|
const u8 i = head->r.bit;
|
|
const u8 config = profile->config[i];
|
|
if (config == TOMOYO_CONFIG_USE_DEFAULT)
|
|
continue;
|
|
tomoyo_io_printf(head, "%u-%s%s", index, "CONFIG::",
|
|
tomoyo_mac_keywords[i]);
|
|
tomoyo_print_config(head, config);
|
|
head->r.bit++;
|
|
break;
|
|
}
|
|
if (head->r.bit == TOMOYO_MAX_MAC_INDEX
|
|
+ TOMOYO_MAX_MAC_CATEGORY_INDEX) {
|
|
tomoyo_print_preference(head, index);
|
|
head->r.index++;
|
|
head->r.step = 1;
|
|
}
|
|
break;
|
|
}
|
|
if (tomoyo_flush(head))
|
|
goto next;
|
|
}
|
|
|
|
static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
|
|
const struct tomoyo_acl_head *b)
|
|
{
|
|
return container_of(a, struct tomoyo_manager, head)->manager ==
|
|
container_of(b, struct tomoyo_manager, head)->manager;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_update_manager_entry - Add a manager entry.
|
|
*
|
|
* @manager: The path to manager or the domainnamme.
|
|
* @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_manager_entry(const char *manager,
|
|
const bool is_delete)
|
|
{
|
|
struct tomoyo_manager e = { };
|
|
int error;
|
|
|
|
if (tomoyo_domain_def(manager)) {
|
|
if (!tomoyo_correct_domain(manager))
|
|
return -EINVAL;
|
|
e.is_domain = true;
|
|
} else {
|
|
if (!tomoyo_correct_path(manager))
|
|
return -EINVAL;
|
|
}
|
|
e.manager = tomoyo_get_name(manager);
|
|
if (!e.manager)
|
|
return -ENOMEM;
|
|
error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
|
|
&tomoyo_policy_list[TOMOYO_ID_MANAGER],
|
|
tomoyo_same_manager);
|
|
tomoyo_put_name(e.manager);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_write_manager - Write manager policy.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
|
|
{
|
|
char *data = head->write_buf;
|
|
bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
|
|
|
|
if (!strcmp(data, "manage_by_non_root")) {
|
|
tomoyo_manage_by_non_root = !is_delete;
|
|
return 0;
|
|
}
|
|
return tomoyo_update_manager_entry(data, is_delete);
|
|
}
|
|
|
|
/**
|
|
* tomoyo_read_manager - Read manager policy.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
|
|
{
|
|
if (head->r.eof)
|
|
return;
|
|
list_for_each_cookie(head->r.acl,
|
|
&tomoyo_policy_list[TOMOYO_ID_MANAGER]) {
|
|
struct tomoyo_manager *ptr =
|
|
list_entry(head->r.acl, typeof(*ptr), head.list);
|
|
if (ptr->head.is_deleted)
|
|
continue;
|
|
if (!tomoyo_flush(head))
|
|
return;
|
|
tomoyo_set_string(head, ptr->manager->name);
|
|
tomoyo_set_lf(head);
|
|
}
|
|
head->r.eof = true;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_manager - Check whether the current process is a policy manager.
|
|
*
|
|
* Returns true if the current process is permitted to modify policy
|
|
* via /sys/kernel/security/tomoyo/ interface.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static bool tomoyo_manager(void)
|
|
{
|
|
struct tomoyo_manager *ptr;
|
|
const char *exe;
|
|
const struct task_struct *task = current;
|
|
const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
|
|
bool found = false;
|
|
|
|
if (!tomoyo_policy_loaded)
|
|
return true;
|
|
if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
|
|
return false;
|
|
list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER],
|
|
head.list) {
|
|
if (!ptr->head.is_deleted && ptr->is_domain
|
|
&& !tomoyo_pathcmp(domainname, ptr->manager)) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (found)
|
|
return true;
|
|
exe = tomoyo_get_exe();
|
|
if (!exe)
|
|
return false;
|
|
list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER],
|
|
head.list) {
|
|
if (!ptr->head.is_deleted && !ptr->is_domain
|
|
&& !strcmp(exe, ptr->manager->name)) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!found) { /* Reduce error messages. */
|
|
static pid_t last_pid;
|
|
const pid_t pid = current->pid;
|
|
if (last_pid != pid) {
|
|
printk(KERN_WARNING "%s ( %s ) is not permitted to "
|
|
"update policies.\n", domainname->name, exe);
|
|
last_pid = pid;
|
|
}
|
|
}
|
|
kfree(exe);
|
|
return found;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_select_one - Parse select command.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
* @data: String to parse.
|
|
*
|
|
* Returns true on success, false otherwise.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static bool tomoyo_select_one(struct tomoyo_io_buffer *head, const char *data)
|
|
{
|
|
unsigned int pid;
|
|
struct tomoyo_domain_info *domain = NULL;
|
|
bool global_pid = false;
|
|
|
|
if (!strcmp(data, "allow_execute")) {
|
|
head->r.print_execute_only = true;
|
|
return true;
|
|
}
|
|
if (sscanf(data, "pid=%u", &pid) == 1 ||
|
|
(global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
|
|
struct task_struct *p;
|
|
rcu_read_lock();
|
|
read_lock(&tasklist_lock);
|
|
if (global_pid)
|
|
p = find_task_by_pid_ns(pid, &init_pid_ns);
|
|
else
|
|
p = find_task_by_vpid(pid);
|
|
if (p)
|
|
domain = tomoyo_real_domain(p);
|
|
read_unlock(&tasklist_lock);
|
|
rcu_read_unlock();
|
|
} else if (!strncmp(data, "domain=", 7)) {
|
|
if (tomoyo_domain_def(data + 7))
|
|
domain = tomoyo_find_domain(data + 7);
|
|
} else
|
|
return false;
|
|
head->write_var1 = domain;
|
|
/* Accessing read_buf is safe because head->io_sem is held. */
|
|
if (!head->read_buf)
|
|
return true; /* Do nothing if open(O_WRONLY). */
|
|
memset(&head->r, 0, sizeof(head->r));
|
|
head->r.print_this_domain_only = true;
|
|
if (domain)
|
|
head->r.domain = &domain->list;
|
|
else
|
|
head->r.eof = 1;
|
|
tomoyo_io_printf(head, "# select %s\n", data);
|
|
if (domain && domain->is_deleted)
|
|
tomoyo_io_printf(head, "# This is a deleted domain.\n");
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_delete_domain - Delete a domain.
|
|
*
|
|
* @domainname: The name of domain.
|
|
*
|
|
* Returns 0.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static int tomoyo_delete_domain(char *domainname)
|
|
{
|
|
struct tomoyo_domain_info *domain;
|
|
struct tomoyo_path_info name;
|
|
|
|
name.name = domainname;
|
|
tomoyo_fill_path_info(&name);
|
|
if (mutex_lock_interruptible(&tomoyo_policy_lock))
|
|
return 0;
|
|
/* Is there an active domain? */
|
|
list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
|
|
/* Never delete tomoyo_kernel_domain */
|
|
if (domain == &tomoyo_kernel_domain)
|
|
continue;
|
|
if (domain->is_deleted ||
|
|
tomoyo_pathcmp(domain->domainname, &name))
|
|
continue;
|
|
domain->is_deleted = true;
|
|
break;
|
|
}
|
|
mutex_unlock(&tomoyo_policy_lock);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_write_domain2 - Write domain policy.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static int tomoyo_write_domain2(char *data, struct tomoyo_domain_info *domain,
|
|
const bool is_delete)
|
|
{
|
|
if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT))
|
|
return tomoyo_write_mount(data, domain, is_delete);
|
|
return tomoyo_write_file(data, domain, is_delete);
|
|
}
|
|
|
|
/**
|
|
* tomoyo_write_domain - Write domain policy.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
|
|
{
|
|
char *data = head->write_buf;
|
|
struct tomoyo_domain_info *domain = head->write_var1;
|
|
bool is_delete = false;
|
|
bool is_select = false;
|
|
unsigned int profile;
|
|
|
|
if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
|
|
is_delete = true;
|
|
else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
|
|
is_select = true;
|
|
if (is_select && tomoyo_select_one(head, data))
|
|
return 0;
|
|
/* Don't allow updating policies by non manager programs. */
|
|
if (!tomoyo_manager())
|
|
return -EPERM;
|
|
if (tomoyo_domain_def(data)) {
|
|
domain = NULL;
|
|
if (is_delete)
|
|
tomoyo_delete_domain(data);
|
|
else if (is_select)
|
|
domain = tomoyo_find_domain(data);
|
|
else
|
|
domain = tomoyo_assign_domain(data, 0);
|
|
head->write_var1 = domain;
|
|
return 0;
|
|
}
|
|
if (!domain)
|
|
return -EINVAL;
|
|
|
|
if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
|
|
&& profile < TOMOYO_MAX_PROFILES) {
|
|
if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
|
|
domain->profile = (u8) profile;
|
|
return 0;
|
|
}
|
|
if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
|
|
domain->ignore_global_allow_read = !is_delete;
|
|
return 0;
|
|
}
|
|
if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) {
|
|
domain->quota_warned = !is_delete;
|
|
return 0;
|
|
}
|
|
if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) {
|
|
domain->transition_failed = !is_delete;
|
|
return 0;
|
|
}
|
|
return tomoyo_write_domain2(data, domain, is_delete);
|
|
}
|
|
|
|
/**
|
|
* tomoyo_fns - Find next set bit.
|
|
*
|
|
* @perm: 8 bits value.
|
|
* @bit: First bit to find.
|
|
*
|
|
* Returns next on-bit on success, 8 otherwise.
|
|
*/
|
|
static u8 tomoyo_fns(const u8 perm, u8 bit)
|
|
{
|
|
for ( ; bit < 8; bit++)
|
|
if (perm & (1 << bit))
|
|
break;
|
|
return bit;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_print_entry - Print an ACL entry.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
* @acl: Pointer to an ACL entry.
|
|
*
|
|
* Returns true on success, false otherwise.
|
|
*/
|
|
static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
|
|
struct tomoyo_acl_info *acl)
|
|
{
|
|
const u8 acl_type = acl->type;
|
|
u8 bit;
|
|
|
|
if (acl->is_deleted)
|
|
return true;
|
|
next:
|
|
bit = head->r.bit;
|
|
if (!tomoyo_flush(head))
|
|
return false;
|
|
else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
|
|
struct tomoyo_path_acl *ptr =
|
|
container_of(acl, typeof(*ptr), head);
|
|
const u16 perm = ptr->perm;
|
|
for ( ; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
|
|
if (!(perm & (1 << bit)))
|
|
continue;
|
|
if (head->r.print_execute_only &&
|
|
bit != TOMOYO_TYPE_EXECUTE)
|
|
continue;
|
|
/* Print "read/write" instead of "read" and "write". */
|
|
if ((bit == TOMOYO_TYPE_READ ||
|
|
bit == TOMOYO_TYPE_WRITE)
|
|
&& (perm & (1 << TOMOYO_TYPE_READ_WRITE)))
|
|
continue;
|
|
break;
|
|
}
|
|
if (bit >= TOMOYO_MAX_PATH_OPERATION)
|
|
goto done;
|
|
tomoyo_io_printf(head, "allow_%s", tomoyo_path_keyword[bit]);
|
|
tomoyo_print_name_union(head, &ptr->name);
|
|
} else if (head->r.print_execute_only) {
|
|
return true;
|
|
} else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
|
|
struct tomoyo_path2_acl *ptr =
|
|
container_of(acl, typeof(*ptr), head);
|
|
bit = tomoyo_fns(ptr->perm, bit);
|
|
if (bit >= TOMOYO_MAX_PATH2_OPERATION)
|
|
goto done;
|
|
tomoyo_io_printf(head, "allow_%s", tomoyo_path2_keyword[bit]);
|
|
tomoyo_print_name_union(head, &ptr->name1);
|
|
tomoyo_print_name_union(head, &ptr->name2);
|
|
} else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
|
|
struct tomoyo_path_number_acl *ptr =
|
|
container_of(acl, typeof(*ptr), head);
|
|
bit = tomoyo_fns(ptr->perm, bit);
|
|
if (bit >= TOMOYO_MAX_PATH_NUMBER_OPERATION)
|
|
goto done;
|
|
tomoyo_io_printf(head, "allow_%s",
|
|
tomoyo_path_number_keyword[bit]);
|
|
tomoyo_print_name_union(head, &ptr->name);
|
|
tomoyo_print_number_union(head, &ptr->number);
|
|
} else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
|
|
struct tomoyo_mkdev_acl *ptr =
|
|
container_of(acl, typeof(*ptr), head);
|
|
bit = tomoyo_fns(ptr->perm, bit);
|
|
if (bit >= TOMOYO_MAX_MKDEV_OPERATION)
|
|
goto done;
|
|
tomoyo_io_printf(head, "allow_%s", tomoyo_mkdev_keyword[bit]);
|
|
tomoyo_print_name_union(head, &ptr->name);
|
|
tomoyo_print_number_union(head, &ptr->mode);
|
|
tomoyo_print_number_union(head, &ptr->major);
|
|
tomoyo_print_number_union(head, &ptr->minor);
|
|
} else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
|
|
struct tomoyo_mount_acl *ptr =
|
|
container_of(acl, typeof(*ptr), head);
|
|
tomoyo_io_printf(head, "allow_mount");
|
|
tomoyo_print_name_union(head, &ptr->dev_name);
|
|
tomoyo_print_name_union(head, &ptr->dir_name);
|
|
tomoyo_print_name_union(head, &ptr->fs_type);
|
|
tomoyo_print_number_union(head, &ptr->flags);
|
|
}
|
|
head->r.bit = bit + 1;
|
|
tomoyo_io_printf(head, "\n");
|
|
if (acl_type != TOMOYO_TYPE_MOUNT_ACL)
|
|
goto next;
|
|
done:
|
|
head->r.bit = 0;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_read_domain2 - Read domain policy.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
* @domain: Pointer to "struct tomoyo_domain_info".
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*
|
|
* Returns true on success, false otherwise.
|
|
*/
|
|
static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
|
|
struct tomoyo_domain_info *domain)
|
|
{
|
|
list_for_each_cookie(head->r.acl, &domain->acl_info_list) {
|
|
struct tomoyo_acl_info *ptr =
|
|
list_entry(head->r.acl, typeof(*ptr), list);
|
|
if (!tomoyo_print_entry(head, ptr))
|
|
return false;
|
|
}
|
|
head->r.acl = NULL;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_read_domain - Read domain policy.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
|
|
{
|
|
if (head->r.eof)
|
|
return;
|
|
list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
|
|
struct tomoyo_domain_info *domain =
|
|
list_entry(head->r.domain, typeof(*domain), list);
|
|
switch (head->r.step) {
|
|
case 0:
|
|
if (domain->is_deleted &&
|
|
!head->r.print_this_domain_only)
|
|
continue;
|
|
/* Print domainname and flags. */
|
|
tomoyo_set_string(head, domain->domainname->name);
|
|
tomoyo_set_lf(head);
|
|
tomoyo_io_printf(head,
|
|
TOMOYO_KEYWORD_USE_PROFILE "%u\n",
|
|
domain->profile);
|
|
if (domain->quota_warned)
|
|
tomoyo_set_string(head, "quota_exceeded\n");
|
|
if (domain->transition_failed)
|
|
tomoyo_set_string(head, "transition_failed\n");
|
|
if (domain->ignore_global_allow_read)
|
|
tomoyo_set_string(head,
|
|
TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ
|
|
"\n");
|
|
head->r.step++;
|
|
tomoyo_set_lf(head);
|
|
/* fall through */
|
|
case 1:
|
|
if (!tomoyo_read_domain2(head, domain))
|
|
return;
|
|
head->r.step++;
|
|
if (!tomoyo_set_lf(head))
|
|
return;
|
|
/* fall through */
|
|
case 2:
|
|
head->r.step = 0;
|
|
if (head->r.print_this_domain_only)
|
|
goto done;
|
|
}
|
|
}
|
|
done:
|
|
head->r.eof = true;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_write_domain_profile - Assign profile for specified domain.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*
|
|
* Returns 0 on success, -EINVAL otherwise.
|
|
*
|
|
* This is equivalent to doing
|
|
*
|
|
* ( echo "select " $domainname; echo "use_profile " $profile ) |
|
|
* /usr/sbin/tomoyo-loadpolicy -d
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
|
|
{
|
|
char *data = head->write_buf;
|
|
char *cp = strchr(data, ' ');
|
|
struct tomoyo_domain_info *domain;
|
|
unsigned long profile;
|
|
|
|
if (!cp)
|
|
return -EINVAL;
|
|
*cp = '\0';
|
|
domain = tomoyo_find_domain(cp + 1);
|
|
if (strict_strtoul(data, 10, &profile))
|
|
return -EINVAL;
|
|
if (domain && profile < TOMOYO_MAX_PROFILES
|
|
&& (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
|
|
domain->profile = (u8) profile;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_read_domain_profile - Read only domainname and profile.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*
|
|
* Returns list of profile number and domainname pairs.
|
|
*
|
|
* This is equivalent to doing
|
|
*
|
|
* grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
|
|
* awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
|
|
* domainname = $0; } else if ( $1 == "use_profile" ) {
|
|
* print $2 " " domainname; domainname = ""; } } ; '
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static void tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
|
|
{
|
|
if (head->r.eof)
|
|
return;
|
|
list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
|
|
struct tomoyo_domain_info *domain =
|
|
list_entry(head->r.domain, typeof(*domain), list);
|
|
if (domain->is_deleted)
|
|
continue;
|
|
if (!tomoyo_flush(head))
|
|
return;
|
|
tomoyo_io_printf(head, "%u ", domain->profile);
|
|
tomoyo_set_string(head, domain->domainname->name);
|
|
tomoyo_set_lf(head);
|
|
}
|
|
head->r.eof = true;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_write_pid: Specify PID to obtain domainname.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*
|
|
* Returns 0.
|
|
*/
|
|
static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
|
|
{
|
|
head->r.eof = false;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_read_pid - Get domainname of the specified PID.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*
|
|
* Returns the domainname which the specified PID is in on success,
|
|
* empty string otherwise.
|
|
* The PID is specified by tomoyo_write_pid() so that the user can obtain
|
|
* using read()/write() interface rather than sysctl() interface.
|
|
*/
|
|
static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
|
|
{
|
|
char *buf = head->write_buf;
|
|
bool global_pid = false;
|
|
unsigned int pid;
|
|
struct task_struct *p;
|
|
struct tomoyo_domain_info *domain = NULL;
|
|
|
|
/* Accessing write_buf is safe because head->io_sem is held. */
|
|
if (!buf) {
|
|
head->r.eof = true;
|
|
return; /* Do nothing if open(O_RDONLY). */
|
|
}
|
|
if (head->r.w_pos || head->r.eof)
|
|
return;
|
|
head->r.eof = true;
|
|
if (tomoyo_str_starts(&buf, "global-pid "))
|
|
global_pid = true;
|
|
pid = (unsigned int) simple_strtoul(buf, NULL, 10);
|
|
rcu_read_lock();
|
|
read_lock(&tasklist_lock);
|
|
if (global_pid)
|
|
p = find_task_by_pid_ns(pid, &init_pid_ns);
|
|
else
|
|
p = find_task_by_vpid(pid);
|
|
if (p)
|
|
domain = tomoyo_real_domain(p);
|
|
read_unlock(&tasklist_lock);
|
|
rcu_read_unlock();
|
|
if (!domain)
|
|
return;
|
|
tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
|
|
tomoyo_set_string(head, domain->domainname->name);
|
|
}
|
|
|
|
static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
|
|
[TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE]
|
|
= TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN,
|
|
[TOMOYO_TRANSITION_CONTROL_INITIALIZE]
|
|
= TOMOYO_KEYWORD_INITIALIZE_DOMAIN,
|
|
[TOMOYO_TRANSITION_CONTROL_NO_KEEP] = TOMOYO_KEYWORD_NO_KEEP_DOMAIN,
|
|
[TOMOYO_TRANSITION_CONTROL_KEEP] = TOMOYO_KEYWORD_KEEP_DOMAIN
|
|
};
|
|
|
|
static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
|
|
[TOMOYO_PATH_GROUP] = TOMOYO_KEYWORD_PATH_GROUP,
|
|
[TOMOYO_NUMBER_GROUP] = TOMOYO_KEYWORD_NUMBER_GROUP
|
|
};
|
|
|
|
/**
|
|
* tomoyo_write_exception - Write exception policy.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
|
|
{
|
|
char *data = head->write_buf;
|
|
bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
|
|
u8 i;
|
|
static const struct {
|
|
const char *keyword;
|
|
int (*write) (char *, const bool);
|
|
} tomoyo_callback[4] = {
|
|
{ TOMOYO_KEYWORD_AGGREGATOR, tomoyo_write_aggregator },
|
|
{ TOMOYO_KEYWORD_FILE_PATTERN, tomoyo_write_pattern },
|
|
{ TOMOYO_KEYWORD_DENY_REWRITE, tomoyo_write_no_rewrite },
|
|
{ TOMOYO_KEYWORD_ALLOW_READ, tomoyo_write_globally_readable },
|
|
};
|
|
|
|
for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
|
|
if (tomoyo_str_starts(&data, tomoyo_transition_type[i]))
|
|
return tomoyo_write_transition_control(data, is_delete,
|
|
i);
|
|
for (i = 0; i < 4; i++)
|
|
if (tomoyo_str_starts(&data, tomoyo_callback[i].keyword))
|
|
return tomoyo_callback[i].write(data, is_delete);
|
|
for (i = 0; i < TOMOYO_MAX_GROUP; i++)
|
|
if (tomoyo_str_starts(&data, tomoyo_group_name[i]))
|
|
return tomoyo_write_group(data, is_delete, i);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
* @idx: Index number.
|
|
*
|
|
* Returns true on success, false otherwise.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
|
|
{
|
|
list_for_each_cookie(head->r.group, &tomoyo_group_list[idx]) {
|
|
struct tomoyo_group *group =
|
|
list_entry(head->r.group, typeof(*group), list);
|
|
list_for_each_cookie(head->r.acl, &group->member_list) {
|
|
struct tomoyo_acl_head *ptr =
|
|
list_entry(head->r.acl, typeof(*ptr), list);
|
|
if (ptr->is_deleted)
|
|
continue;
|
|
if (!tomoyo_flush(head))
|
|
return false;
|
|
tomoyo_set_string(head, tomoyo_group_name[idx]);
|
|
tomoyo_set_string(head, group->group_name->name);
|
|
if (idx == TOMOYO_PATH_GROUP) {
|
|
tomoyo_set_space(head);
|
|
tomoyo_set_string(head, container_of
|
|
(ptr, struct tomoyo_path_group,
|
|
head)->member_name->name);
|
|
} else if (idx == TOMOYO_NUMBER_GROUP) {
|
|
tomoyo_print_number_union(head, &container_of
|
|
(ptr,
|
|
struct tomoyo_number_group,
|
|
head)->number);
|
|
}
|
|
tomoyo_set_lf(head);
|
|
}
|
|
head->r.acl = NULL;
|
|
}
|
|
head->r.group = NULL;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
* @idx: Index number.
|
|
*
|
|
* Returns true on success, false otherwise.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
|
|
{
|
|
list_for_each_cookie(head->r.acl, &tomoyo_policy_list[idx]) {
|
|
struct tomoyo_acl_head *acl =
|
|
container_of(head->r.acl, typeof(*acl), list);
|
|
if (acl->is_deleted)
|
|
continue;
|
|
if (!tomoyo_flush(head))
|
|
return false;
|
|
switch (idx) {
|
|
case TOMOYO_ID_TRANSITION_CONTROL:
|
|
{
|
|
struct tomoyo_transition_control *ptr =
|
|
container_of(acl, typeof(*ptr), head);
|
|
tomoyo_set_string(head,
|
|
tomoyo_transition_type
|
|
[ptr->type]);
|
|
if (ptr->program)
|
|
tomoyo_set_string(head,
|
|
ptr->program->name);
|
|
if (ptr->program && ptr->domainname)
|
|
tomoyo_set_string(head, " from ");
|
|
if (ptr->domainname)
|
|
tomoyo_set_string(head,
|
|
ptr->domainname->
|
|
name);
|
|
}
|
|
break;
|
|
case TOMOYO_ID_GLOBALLY_READABLE:
|
|
{
|
|
struct tomoyo_readable_file *ptr =
|
|
container_of(acl, typeof(*ptr), head);
|
|
tomoyo_set_string(head,
|
|
TOMOYO_KEYWORD_ALLOW_READ);
|
|
tomoyo_set_string(head, ptr->filename->name);
|
|
}
|
|
break;
|
|
case TOMOYO_ID_AGGREGATOR:
|
|
{
|
|
struct tomoyo_aggregator *ptr =
|
|
container_of(acl, typeof(*ptr), head);
|
|
tomoyo_set_string(head,
|
|
TOMOYO_KEYWORD_AGGREGATOR);
|
|
tomoyo_set_string(head,
|
|
ptr->original_name->name);
|
|
tomoyo_set_space(head);
|
|
tomoyo_set_string(head,
|
|
ptr->aggregated_name->name);
|
|
}
|
|
break;
|
|
case TOMOYO_ID_PATTERN:
|
|
{
|
|
struct tomoyo_no_pattern *ptr =
|
|
container_of(acl, typeof(*ptr), head);
|
|
tomoyo_set_string(head,
|
|
TOMOYO_KEYWORD_FILE_PATTERN);
|
|
tomoyo_set_string(head, ptr->pattern->name);
|
|
}
|
|
break;
|
|
case TOMOYO_ID_NO_REWRITE:
|
|
{
|
|
struct tomoyo_no_rewrite *ptr =
|
|
container_of(acl, typeof(*ptr), head);
|
|
tomoyo_set_string(head,
|
|
TOMOYO_KEYWORD_DENY_REWRITE);
|
|
tomoyo_set_string(head, ptr->pattern->name);
|
|
}
|
|
break;
|
|
default:
|
|
continue;
|
|
}
|
|
tomoyo_set_lf(head);
|
|
}
|
|
head->r.acl = NULL;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_read_exception - Read exception policy.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
|
|
{
|
|
if (head->r.eof)
|
|
return;
|
|
while (head->r.step < TOMOYO_MAX_POLICY &&
|
|
tomoyo_read_policy(head, head->r.step))
|
|
head->r.step++;
|
|
if (head->r.step < TOMOYO_MAX_POLICY)
|
|
return;
|
|
while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
|
|
tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
|
|
head->r.step++;
|
|
if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
|
|
return;
|
|
head->r.eof = true;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_print_header - Get header line of audit log.
|
|
*
|
|
* @r: Pointer to "struct tomoyo_request_info".
|
|
*
|
|
* Returns string representation.
|
|
*
|
|
* This function uses kmalloc(), so caller must kfree() if this function
|
|
* didn't return NULL.
|
|
*/
|
|
static char *tomoyo_print_header(struct tomoyo_request_info *r)
|
|
{
|
|
struct timeval tv;
|
|
const pid_t gpid = task_pid_nr(current);
|
|
static const int tomoyo_buffer_len = 4096;
|
|
char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
|
|
pid_t ppid;
|
|
if (!buffer)
|
|
return NULL;
|
|
do_gettimeofday(&tv);
|
|
rcu_read_lock();
|
|
ppid = task_tgid_vnr(current->real_parent);
|
|
rcu_read_unlock();
|
|
snprintf(buffer, tomoyo_buffer_len - 1,
|
|
"#timestamp=%lu profile=%u mode=%s (global-pid=%u)"
|
|
" task={ pid=%u ppid=%u uid=%u gid=%u euid=%u"
|
|
" egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }",
|
|
tv.tv_sec, r->profile, tomoyo_mode[r->mode], gpid,
|
|
task_tgid_vnr(current), ppid,
|
|
current_uid(), current_gid(), current_euid(),
|
|
current_egid(), current_suid(), current_sgid(),
|
|
current_fsuid(), current_fsgid());
|
|
return buffer;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_init_audit_log - Allocate buffer for audit logs.
|
|
*
|
|
* @len: Required size.
|
|
* @r: Pointer to "struct tomoyo_request_info".
|
|
*
|
|
* Returns pointer to allocated memory.
|
|
*
|
|
* The @len is updated to add the header lines' size on success.
|
|
*
|
|
* This function uses kzalloc(), so caller must kfree() if this function
|
|
* didn't return NULL.
|
|
*/
|
|
static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r)
|
|
{
|
|
char *buf = NULL;
|
|
const char *header;
|
|
const char *domainname;
|
|
if (!r->domain)
|
|
r->domain = tomoyo_domain();
|
|
domainname = r->domain->domainname->name;
|
|
header = tomoyo_print_header(r);
|
|
if (!header)
|
|
return NULL;
|
|
*len += strlen(domainname) + strlen(header) + 10;
|
|
buf = kzalloc(*len, GFP_NOFS);
|
|
if (buf)
|
|
snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname);
|
|
kfree(header);
|
|
return buf;
|
|
}
|
|
|
|
/* Wait queue for tomoyo_query_list. */
|
|
static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
|
|
|
|
/* Lock for manipulating tomoyo_query_list. */
|
|
static DEFINE_SPINLOCK(tomoyo_query_list_lock);
|
|
|
|
/* Structure for query. */
|
|
struct tomoyo_query {
|
|
struct list_head list;
|
|
char *query;
|
|
int query_len;
|
|
unsigned int serial;
|
|
int timer;
|
|
int answer;
|
|
};
|
|
|
|
/* The list for "struct tomoyo_query". */
|
|
static LIST_HEAD(tomoyo_query_list);
|
|
|
|
/*
|
|
* Number of "struct file" referring /sys/kernel/security/tomoyo/query
|
|
* interface.
|
|
*/
|
|
static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
|
|
|
|
/**
|
|
* tomoyo_supervisor - Ask for the supervisor's decision.
|
|
*
|
|
* @r: Pointer to "struct tomoyo_request_info".
|
|
* @fmt: The printf()'s format string, followed by parameters.
|
|
*
|
|
* Returns 0 if the supervisor decided to permit the access request which
|
|
* violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
|
|
* supervisor decided to retry the access request which violated the policy in
|
|
* enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
|
|
*/
|
|
int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int error = -EPERM;
|
|
int pos;
|
|
int len;
|
|
static unsigned int tomoyo_serial;
|
|
struct tomoyo_query *entry = NULL;
|
|
bool quota_exceeded = false;
|
|
char *header;
|
|
switch (r->mode) {
|
|
char *buffer;
|
|
case TOMOYO_CONFIG_LEARNING:
|
|
if (!tomoyo_domain_quota_is_ok(r))
|
|
return 0;
|
|
va_start(args, fmt);
|
|
len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4;
|
|
va_end(args);
|
|
buffer = kmalloc(len, GFP_NOFS);
|
|
if (!buffer)
|
|
return 0;
|
|
va_start(args, fmt);
|
|
vsnprintf(buffer, len - 1, fmt, args);
|
|
va_end(args);
|
|
tomoyo_normalize_line(buffer);
|
|
tomoyo_write_domain2(buffer, r->domain, false);
|
|
kfree(buffer);
|
|
/* fall through */
|
|
case TOMOYO_CONFIG_PERMISSIVE:
|
|
return 0;
|
|
}
|
|
if (!r->domain)
|
|
r->domain = tomoyo_domain();
|
|
if (!atomic_read(&tomoyo_query_observers))
|
|
return -EPERM;
|
|
va_start(args, fmt);
|
|
len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32;
|
|
va_end(args);
|
|
header = tomoyo_init_audit_log(&len, r);
|
|
if (!header)
|
|
goto out;
|
|
entry = kzalloc(sizeof(*entry), GFP_NOFS);
|
|
if (!entry)
|
|
goto out;
|
|
entry->query = kzalloc(len, GFP_NOFS);
|
|
if (!entry->query)
|
|
goto out;
|
|
len = ksize(entry->query);
|
|
spin_lock(&tomoyo_query_list_lock);
|
|
if (tomoyo_quota_for_query && tomoyo_query_memory_size + len +
|
|
sizeof(*entry) >= tomoyo_quota_for_query) {
|
|
quota_exceeded = true;
|
|
} else {
|
|
tomoyo_query_memory_size += len + sizeof(*entry);
|
|
entry->serial = tomoyo_serial++;
|
|
}
|
|
spin_unlock(&tomoyo_query_list_lock);
|
|
if (quota_exceeded)
|
|
goto out;
|
|
pos = snprintf(entry->query, len - 1, "Q%u-%hu\n%s",
|
|
entry->serial, r->retry, header);
|
|
kfree(header);
|
|
header = NULL;
|
|
va_start(args, fmt);
|
|
vsnprintf(entry->query + pos, len - 1 - pos, fmt, args);
|
|
entry->query_len = strlen(entry->query) + 1;
|
|
va_end(args);
|
|
spin_lock(&tomoyo_query_list_lock);
|
|
list_add_tail(&entry->list, &tomoyo_query_list);
|
|
spin_unlock(&tomoyo_query_list_lock);
|
|
/* Give 10 seconds for supervisor's opinion. */
|
|
for (entry->timer = 0;
|
|
atomic_read(&tomoyo_query_observers) && entry->timer < 100;
|
|
entry->timer++) {
|
|
wake_up(&tomoyo_query_wait);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule_timeout(HZ / 10);
|
|
if (entry->answer)
|
|
break;
|
|
}
|
|
spin_lock(&tomoyo_query_list_lock);
|
|
list_del(&entry->list);
|
|
tomoyo_query_memory_size -= len + sizeof(*entry);
|
|
spin_unlock(&tomoyo_query_list_lock);
|
|
switch (entry->answer) {
|
|
case 3: /* Asked to retry by administrator. */
|
|
error = TOMOYO_RETRY_REQUEST;
|
|
r->retry++;
|
|
break;
|
|
case 1:
|
|
/* Granted by administrator. */
|
|
error = 0;
|
|
break;
|
|
case 0:
|
|
/* Timed out. */
|
|
break;
|
|
default:
|
|
/* Rejected by administrator. */
|
|
break;
|
|
}
|
|
out:
|
|
if (entry)
|
|
kfree(entry->query);
|
|
kfree(entry);
|
|
kfree(header);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
|
|
*
|
|
* @file: Pointer to "struct file".
|
|
* @wait: Pointer to "poll_table".
|
|
*
|
|
* Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
|
|
*
|
|
* Waits for access requests which violated policy in enforcing mode.
|
|
*/
|
|
static int tomoyo_poll_query(struct file *file, poll_table *wait)
|
|
{
|
|
struct list_head *tmp;
|
|
bool found = false;
|
|
u8 i;
|
|
for (i = 0; i < 2; i++) {
|
|
spin_lock(&tomoyo_query_list_lock);
|
|
list_for_each(tmp, &tomoyo_query_list) {
|
|
struct tomoyo_query *ptr =
|
|
list_entry(tmp, typeof(*ptr), list);
|
|
if (ptr->answer)
|
|
continue;
|
|
found = true;
|
|
break;
|
|
}
|
|
spin_unlock(&tomoyo_query_list_lock);
|
|
if (found)
|
|
return POLLIN | POLLRDNORM;
|
|
if (i)
|
|
break;
|
|
poll_wait(file, &tomoyo_query_wait, wait);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_read_query - Read access requests which violated policy in enforcing mode.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*/
|
|
static void tomoyo_read_query(struct tomoyo_io_buffer *head)
|
|
{
|
|
struct list_head *tmp;
|
|
int pos = 0;
|
|
int len = 0;
|
|
char *buf;
|
|
if (head->r.w_pos)
|
|
return;
|
|
if (head->read_buf) {
|
|
kfree(head->read_buf);
|
|
head->read_buf = NULL;
|
|
}
|
|
spin_lock(&tomoyo_query_list_lock);
|
|
list_for_each(tmp, &tomoyo_query_list) {
|
|
struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
|
|
if (ptr->answer)
|
|
continue;
|
|
if (pos++ != head->r.query_index)
|
|
continue;
|
|
len = ptr->query_len;
|
|
break;
|
|
}
|
|
spin_unlock(&tomoyo_query_list_lock);
|
|
if (!len) {
|
|
head->r.query_index = 0;
|
|
return;
|
|
}
|
|
buf = kzalloc(len, GFP_NOFS);
|
|
if (!buf)
|
|
return;
|
|
pos = 0;
|
|
spin_lock(&tomoyo_query_list_lock);
|
|
list_for_each(tmp, &tomoyo_query_list) {
|
|
struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
|
|
if (ptr->answer)
|
|
continue;
|
|
if (pos++ != head->r.query_index)
|
|
continue;
|
|
/*
|
|
* Some query can be skipped because tomoyo_query_list
|
|
* can change, but I don't care.
|
|
*/
|
|
if (len == ptr->query_len)
|
|
memmove(buf, ptr->query, len);
|
|
break;
|
|
}
|
|
spin_unlock(&tomoyo_query_list_lock);
|
|
if (buf[0]) {
|
|
head->read_buf = buf;
|
|
head->r.w[head->r.w_pos++] = buf;
|
|
head->r.query_index++;
|
|
} else {
|
|
kfree(buf);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tomoyo_write_answer - Write the supervisor's decision.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*
|
|
* Returns 0 on success, -EINVAL otherwise.
|
|
*/
|
|
static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
|
|
{
|
|
char *data = head->write_buf;
|
|
struct list_head *tmp;
|
|
unsigned int serial;
|
|
unsigned int answer;
|
|
spin_lock(&tomoyo_query_list_lock);
|
|
list_for_each(tmp, &tomoyo_query_list) {
|
|
struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
|
|
ptr->timer = 0;
|
|
}
|
|
spin_unlock(&tomoyo_query_list_lock);
|
|
if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
|
|
return -EINVAL;
|
|
spin_lock(&tomoyo_query_list_lock);
|
|
list_for_each(tmp, &tomoyo_query_list) {
|
|
struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
|
|
if (ptr->serial != serial)
|
|
continue;
|
|
if (!ptr->answer)
|
|
ptr->answer = answer;
|
|
break;
|
|
}
|
|
spin_unlock(&tomoyo_query_list_lock);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_read_version: Get version.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*
|
|
* Returns version information.
|
|
*/
|
|
static void tomoyo_read_version(struct tomoyo_io_buffer *head)
|
|
{
|
|
if (!head->r.eof) {
|
|
tomoyo_io_printf(head, "2.3.0");
|
|
head->r.eof = true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tomoyo_read_self_domain - Get the current process's domainname.
|
|
*
|
|
* @head: Pointer to "struct tomoyo_io_buffer".
|
|
*
|
|
* Returns the current process's domainname.
|
|
*/
|
|
static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
|
|
{
|
|
if (!head->r.eof) {
|
|
/*
|
|
* tomoyo_domain()->domainname != NULL
|
|
* because every process belongs to a domain and
|
|
* the domain's name cannot be NULL.
|
|
*/
|
|
tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
|
|
head->r.eof = true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
|
|
*
|
|
* @type: Type of interface.
|
|
* @file: Pointer to "struct file".
|
|
*
|
|
* Associates policy handler and returns 0 on success, -ENOMEM otherwise.
|
|
*
|
|
* Caller acquires tomoyo_read_lock().
|
|
*/
|
|
int tomoyo_open_control(const u8 type, struct file *file)
|
|
{
|
|
struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
|
|
|
|
if (!head)
|
|
return -ENOMEM;
|
|
mutex_init(&head->io_sem);
|
|
head->type = type;
|
|
switch (type) {
|
|
case TOMOYO_DOMAINPOLICY:
|
|
/* /sys/kernel/security/tomoyo/domain_policy */
|
|
head->write = tomoyo_write_domain;
|
|
head->read = tomoyo_read_domain;
|
|
break;
|
|
case TOMOYO_EXCEPTIONPOLICY:
|
|
/* /sys/kernel/security/tomoyo/exception_policy */
|
|
head->write = tomoyo_write_exception;
|
|
head->read = tomoyo_read_exception;
|
|
break;
|
|
case TOMOYO_SELFDOMAIN:
|
|
/* /sys/kernel/security/tomoyo/self_domain */
|
|
head->read = tomoyo_read_self_domain;
|
|
break;
|
|
case TOMOYO_DOMAIN_STATUS:
|
|
/* /sys/kernel/security/tomoyo/.domain_status */
|
|
head->write = tomoyo_write_domain_profile;
|
|
head->read = tomoyo_read_domain_profile;
|
|
break;
|
|
case TOMOYO_PROCESS_STATUS:
|
|
/* /sys/kernel/security/tomoyo/.process_status */
|
|
head->write = tomoyo_write_pid;
|
|
head->read = tomoyo_read_pid;
|
|
break;
|
|
case TOMOYO_VERSION:
|
|
/* /sys/kernel/security/tomoyo/version */
|
|
head->read = tomoyo_read_version;
|
|
head->readbuf_size = 128;
|
|
break;
|
|
case TOMOYO_MEMINFO:
|
|
/* /sys/kernel/security/tomoyo/meminfo */
|
|
head->write = tomoyo_write_memory_quota;
|
|
head->read = tomoyo_read_memory_counter;
|
|
head->readbuf_size = 512;
|
|
break;
|
|
case TOMOYO_PROFILE:
|
|
/* /sys/kernel/security/tomoyo/profile */
|
|
head->write = tomoyo_write_profile;
|
|
head->read = tomoyo_read_profile;
|
|
break;
|
|
case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
|
|
head->poll = tomoyo_poll_query;
|
|
head->write = tomoyo_write_answer;
|
|
head->read = tomoyo_read_query;
|
|
break;
|
|
case TOMOYO_MANAGER:
|
|
/* /sys/kernel/security/tomoyo/manager */
|
|
head->write = tomoyo_write_manager;
|
|
head->read = tomoyo_read_manager;
|
|
break;
|
|
}
|
|
if (!(file->f_mode & FMODE_READ)) {
|
|
/*
|
|
* No need to allocate read_buf since it is not opened
|
|
* for reading.
|
|
*/
|
|
head->read = NULL;
|
|
head->poll = NULL;
|
|
} else if (!head->poll) {
|
|
/* Don't allocate read_buf for poll() access. */
|
|
if (!head->readbuf_size)
|
|
head->readbuf_size = 4096 * 2;
|
|
head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
|
|
if (!head->read_buf) {
|
|
kfree(head);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
if (!(file->f_mode & FMODE_WRITE)) {
|
|
/*
|
|
* No need to allocate write_buf since it is not opened
|
|
* for writing.
|
|
*/
|
|
head->write = NULL;
|
|
} else if (head->write) {
|
|
head->writebuf_size = 4096 * 2;
|
|
head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
|
|
if (!head->write_buf) {
|
|
kfree(head->read_buf);
|
|
kfree(head);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
if (type != TOMOYO_QUERY)
|
|
head->reader_idx = tomoyo_read_lock();
|
|
file->private_data = head;
|
|
/*
|
|
* Call the handler now if the file is
|
|
* /sys/kernel/security/tomoyo/self_domain
|
|
* so that the user can use
|
|
* cat < /sys/kernel/security/tomoyo/self_domain"
|
|
* to know the current process's domainname.
|
|
*/
|
|
if (type == TOMOYO_SELFDOMAIN)
|
|
tomoyo_read_control(file, NULL, 0);
|
|
/*
|
|
* If the file is /sys/kernel/security/tomoyo/query , increment the
|
|
* observer counter.
|
|
* The obserber counter is used by tomoyo_supervisor() to see if
|
|
* there is some process monitoring /sys/kernel/security/tomoyo/query.
|
|
*/
|
|
else if (type == TOMOYO_QUERY)
|
|
atomic_inc(&tomoyo_query_observers);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
|
|
*
|
|
* @file: Pointer to "struct file".
|
|
* @wait: Pointer to "poll_table".
|
|
*
|
|
* Waits for read readiness.
|
|
* /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd .
|
|
*/
|
|
int tomoyo_poll_control(struct file *file, poll_table *wait)
|
|
{
|
|
struct tomoyo_io_buffer *head = file->private_data;
|
|
if (!head->poll)
|
|
return -ENOSYS;
|
|
return head->poll(file, wait);
|
|
}
|
|
|
|
/**
|
|
* tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
|
|
*
|
|
* @file: Pointer to "struct file".
|
|
* @buffer: Poiner to buffer to write to.
|
|
* @buffer_len: Size of @buffer.
|
|
*
|
|
* Returns bytes read on success, negative value otherwise.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
int tomoyo_read_control(struct file *file, char __user *buffer,
|
|
const int buffer_len)
|
|
{
|
|
int len;
|
|
struct tomoyo_io_buffer *head = file->private_data;
|
|
|
|
if (!head->read)
|
|
return -ENOSYS;
|
|
if (mutex_lock_interruptible(&head->io_sem))
|
|
return -EINTR;
|
|
head->read_user_buf = buffer;
|
|
head->read_user_buf_avail = buffer_len;
|
|
if (tomoyo_flush(head))
|
|
/* Call the policy handler. */
|
|
head->read(head);
|
|
tomoyo_flush(head);
|
|
len = head->read_user_buf - buffer;
|
|
mutex_unlock(&head->io_sem);
|
|
return len;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
|
|
*
|
|
* @file: Pointer to "struct file".
|
|
* @buffer: Pointer to buffer to read from.
|
|
* @buffer_len: Size of @buffer.
|
|
*
|
|
* Returns @buffer_len on success, negative value otherwise.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
int tomoyo_write_control(struct file *file, const char __user *buffer,
|
|
const int buffer_len)
|
|
{
|
|
struct tomoyo_io_buffer *head = file->private_data;
|
|
int error = buffer_len;
|
|
int avail_len = buffer_len;
|
|
char *cp0 = head->write_buf;
|
|
|
|
if (!head->write)
|
|
return -ENOSYS;
|
|
if (!access_ok(VERIFY_READ, buffer, buffer_len))
|
|
return -EFAULT;
|
|
/* Don't allow updating policies by non manager programs. */
|
|
if (head->write != tomoyo_write_pid &&
|
|
head->write != tomoyo_write_domain && !tomoyo_manager())
|
|
return -EPERM;
|
|
if (mutex_lock_interruptible(&head->io_sem))
|
|
return -EINTR;
|
|
/* Read a line and dispatch it to the policy handler. */
|
|
while (avail_len > 0) {
|
|
char c;
|
|
if (head->write_avail >= head->writebuf_size - 1) {
|
|
error = -ENOMEM;
|
|
break;
|
|
} else if (get_user(c, buffer)) {
|
|
error = -EFAULT;
|
|
break;
|
|
}
|
|
buffer++;
|
|
avail_len--;
|
|
cp0[head->write_avail++] = c;
|
|
if (c != '\n')
|
|
continue;
|
|
cp0[head->write_avail - 1] = '\0';
|
|
head->write_avail = 0;
|
|
tomoyo_normalize_line(cp0);
|
|
head->write(head);
|
|
}
|
|
mutex_unlock(&head->io_sem);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
|
|
*
|
|
* @file: Pointer to "struct file".
|
|
*
|
|
* Releases memory and returns 0.
|
|
*
|
|
* Caller looses tomoyo_read_lock().
|
|
*/
|
|
int tomoyo_close_control(struct file *file)
|
|
{
|
|
struct tomoyo_io_buffer *head = file->private_data;
|
|
const bool is_write = !!head->write_buf;
|
|
|
|
/*
|
|
* If the file is /sys/kernel/security/tomoyo/query , decrement the
|
|
* observer counter.
|
|
*/
|
|
if (head->type == TOMOYO_QUERY)
|
|
atomic_dec(&tomoyo_query_observers);
|
|
else
|
|
tomoyo_read_unlock(head->reader_idx);
|
|
/* Release memory used for policy I/O. */
|
|
kfree(head->read_buf);
|
|
head->read_buf = NULL;
|
|
kfree(head->write_buf);
|
|
head->write_buf = NULL;
|
|
kfree(head);
|
|
head = NULL;
|
|
file->private_data = NULL;
|
|
if (is_write)
|
|
tomoyo_run_gc();
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
|
|
*/
|
|
void tomoyo_check_profile(void)
|
|
{
|
|
struct tomoyo_domain_info *domain;
|
|
const int idx = tomoyo_read_lock();
|
|
tomoyo_policy_loaded = true;
|
|
/* Check all profiles currently assigned to domains are defined. */
|
|
list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
|
|
const u8 profile = domain->profile;
|
|
if (tomoyo_profile_ptr[profile])
|
|
continue;
|
|
printk(KERN_ERR "You need to define profile %u before using it.\n",
|
|
profile);
|
|
printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.3/ "
|
|
"for more information.\n");
|
|
panic("Profile %u (used by '%s') not defined.\n",
|
|
profile, domain->domainname->name);
|
|
}
|
|
tomoyo_read_unlock(idx);
|
|
if (tomoyo_profile_version != 20090903) {
|
|
printk(KERN_ERR "You need to install userland programs for "
|
|
"TOMOYO 2.3 and initialize policy configuration.\n");
|
|
printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.3/ "
|
|
"for more information.\n");
|
|
panic("Profile version %u is not supported.\n",
|
|
tomoyo_profile_version);
|
|
}
|
|
printk(KERN_INFO "TOMOYO: 2.3.0\n");
|
|
printk(KERN_INFO "Mandatory Access Control activated.\n");
|
|
}
|