p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
linux_old1/security/tomoyo/common.c

2046 lines
53 KiB
C
Raw Blame History

/*
* security/tomoyo/common.c
*
* Common functions for TOMOYO.
*
* Copyright (C) 2005-2010 NTT DATA CORPORATION
*/
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/security.h>
#include "common.h"
/* Profile version. Currently only 20090903 is defined. */
static unsigned int tomoyo_profile_version;
/* Profile table. Memory is allocated as needed. */
static struct tomoyo_profile *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES];
/* String table for operation mode. */
const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
[TOMOYO_CONFIG_DISABLED] = "disabled",
[TOMOYO_CONFIG_LEARNING] = "learning",
[TOMOYO_CONFIG_PERMISSIVE] = "permissive",
[TOMOYO_CONFIG_ENFORCING] = "enforcing"
};
/* String table for /sys/kernel/security/tomoyo/profile */
static const char *tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
+ TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
[TOMOYO_MAC_FILE_EXECUTE] = "file::execute",
[TOMOYO_MAC_FILE_OPEN] = "file::open",
[TOMOYO_MAC_FILE_CREATE] = "file::create",
[TOMOYO_MAC_FILE_UNLINK] = "file::unlink",
[TOMOYO_MAC_FILE_GETATTR] = "file::getattr",
[TOMOYO_MAC_FILE_MKDIR] = "file::mkdir",
[TOMOYO_MAC_FILE_RMDIR] = "file::rmdir",
[TOMOYO_MAC_FILE_MKFIFO] = "file::mkfifo",
[TOMOYO_MAC_FILE_MKSOCK] = "file::mksock",
[TOMOYO_MAC_FILE_TRUNCATE] = "file::truncate",
[TOMOYO_MAC_FILE_SYMLINK] = "file::symlink",
[TOMOYO_MAC_FILE_MKBLOCK] = "file::mkblock",
[TOMOYO_MAC_FILE_MKCHAR] = "file::mkchar",
[TOMOYO_MAC_FILE_LINK] = "file::link",
[TOMOYO_MAC_FILE_RENAME] = "file::rename",
[TOMOYO_MAC_FILE_CHMOD] = "file::chmod",
[TOMOYO_MAC_FILE_CHOWN] = "file::chown",
[TOMOYO_MAC_FILE_CHGRP] = "file::chgrp",
[TOMOYO_MAC_FILE_IOCTL] = "file::ioctl",
[TOMOYO_MAC_FILE_CHROOT] = "file::chroot",
[TOMOYO_MAC_FILE_MOUNT] = "file::mount",
[TOMOYO_MAC_FILE_UMOUNT] = "file::unmount",
[TOMOYO_MAC_FILE_PIVOT_ROOT] = "file::pivot_root",
[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
};
/* String table for PREFERENCE keyword. */
static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
[TOMOYO_PREF_MAX_AUDIT_LOG] = "max_audit_log",
[TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
};
/* Permit policy management by non-root user? */
static bool tomoyo_manage_by_non_root;
/* Utility functions. */
/**
* tomoyo_yesno - Return "yes" or "no".
*
* @value: Bool value.
*/
const char *tomoyo_yesno(const unsigned int value)
{
return value ? "yes" : "no";
}
/**
* tomoyo_addprintf - strncat()-like-snprintf().
*
* @buffer: Buffer to write to. Must be '\0'-terminated.
* @len: Size of @buffer.
* @fmt: The printf()'s format string, followed by parameters.
*
* Returns nothing.
*/
static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
{
va_list args;
const int pos = strlen(buffer);
va_start(args, fmt);
vsnprintf(buffer + pos, len - pos - 1, fmt, args);
va_end(args);
}
/**
* tomoyo_flush - Flush queued string to userspace's buffer.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Returns true if all data was flushed, false otherwise.
*/
static bool tomoyo_flush(struct tomoyo_io_buffer *head)
{
while (head->r.w_pos) {
const char *w = head->r.w[0];
int len = strlen(w);
if (len) {
if (len > head->read_user_buf_avail)
len = head->read_user_buf_avail;
if (!len)
return false;
if (copy_to_user(head->read_user_buf, w, len))
return false;
head->read_user_buf_avail -= len;
head->read_user_buf += len;
w += len;
}
head->r.w[0] = w;
if (*w)
return false;
/* Add '\0' for audit logs and query. */
if (head->poll) {
if (!head->read_user_buf_avail ||
copy_to_user(head->read_user_buf, "", 1))
return false;
head->read_user_buf_avail--;
head->read_user_buf++;
}
head->r.w_pos--;
for (len = 0; len < head->r.w_pos; len++)
head->r.w[len] = head->r.w[len + 1];
}
head->r.avail = 0;
return true;
}
/**
* tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
*
* @head: Pointer to "struct tomoyo_io_buffer".
* @string: String to print.
*
* Note that @string has to be kept valid until @head is kfree()d.
* This means that char[] allocated on stack memory cannot be passed to
* this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
*/
static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
{
if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
head->r.w[head->r.w_pos++] = string;
tomoyo_flush(head);
} else
WARN_ON(1);
}
/**
* tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
*
* @head: Pointer to "struct tomoyo_io_buffer".
* @fmt: The printf()'s format string, followed by parameters.
*/
void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
{
va_list args;
int len;
int pos = head->r.avail;
int size = head->readbuf_size - pos;
if (size <= 0)
return;
va_start(args, fmt);
len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
va_end(args);
if (pos + len >= head->readbuf_size) {
WARN_ON(1);
return;
}
head->r.avail += len;
tomoyo_set_string(head, head->read_buf + pos);
}
/**
* tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Returns nothing.
*/
static void tomoyo_set_space(struct tomoyo_io_buffer *head)
{
tomoyo_set_string(head, " ");
}
/**
* tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Returns nothing.
*/
static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
{
tomoyo_set_string(head, "\n");
return !head->r.w_pos;
}
/**
* tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Returns nothing.
*/
static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
{
tomoyo_set_string(head, "/");
}
/**
* tomoyo_print_name_union - Print a tomoyo_name_union.
*
* @head: Pointer to "struct tomoyo_io_buffer".
* @ptr: Pointer to "struct tomoyo_name_union".
*/
static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
const struct tomoyo_name_union *ptr)
{
tomoyo_set_space(head);
if (ptr->group) {
tomoyo_set_string(head, "@");
tomoyo_set_string(head, ptr->group->group_name->name);
} else {
tomoyo_set_string(head, ptr->filename->name);
}
}
/**
* tomoyo_print_number_union - Print a tomoyo_number_union.
*
* @head: Pointer to "struct tomoyo_io_buffer".
* @ptr: Pointer to "struct tomoyo_number_union".
*/
static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
const struct tomoyo_number_union *ptr)
{
tomoyo_set_space(head);
if (ptr->group) {
tomoyo_set_string(head, "@");
tomoyo_set_string(head, ptr->group->group_name->name);
} else {
int i;
unsigned long min = ptr->values[0];
const unsigned long max = ptr->values[1];
u8 min_type = ptr->value_type[0];
const u8 max_type = ptr->value_type[1];
char buffer[128];
buffer[0] = '\0';
for (i = 0; i < 2; i++) {
switch (min_type) {
case TOMOYO_VALUE_TYPE_HEXADECIMAL:
tomoyo_addprintf(buffer, sizeof(buffer),
"0x%lX", min);
break;
case TOMOYO_VALUE_TYPE_OCTAL:
tomoyo_addprintf(buffer, sizeof(buffer),
"0%lo", min);
break;
default:
tomoyo_addprintf(buffer, sizeof(buffer),
"%lu", min);
break;
}
if (min == max && min_type == max_type)
break;
tomoyo_addprintf(buffer, sizeof(buffer), "-");
min_type = max_type;
min = max;
}
tomoyo_io_printf(head, "%s", buffer);
}
}
/**
* tomoyo_assign_profile - Create a new profile.
*
* @profile: Profile number to create.
*
* Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
*/
static struct tomoyo_profile *tomoyo_assign_profile(const unsigned int profile)
{
struct tomoyo_profile *ptr;
struct tomoyo_profile *entry;
if (profile >= TOMOYO_MAX_PROFILES)
return NULL;
ptr = tomoyo_profile_ptr[profile];
if (ptr)
return ptr;
entry = kzalloc(sizeof(*entry), GFP_NOFS);
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
ptr = tomoyo_profile_ptr[profile];
if (!ptr && tomoyo_memory_ok(entry)) {
ptr = entry;
ptr->default_config = TOMOYO_CONFIG_DISABLED |
TOMOYO_CONFIG_WANT_GRANT_LOG |
TOMOYO_CONFIG_WANT_REJECT_LOG;
memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
sizeof(ptr->config));
ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] = 1024;
ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] = 2048;
mb(); /* Avoid out-of-order execution. */
tomoyo_profile_ptr[profile] = ptr;
entry = NULL;
}
mutex_unlock(&tomoyo_policy_lock);
out:
kfree(entry);
return ptr;
}
/**
* tomoyo_profile - Find a profile.
*
* @profile: Profile number to find.
*
* Returns pointer to "struct tomoyo_profile".
*/
struct tomoyo_profile *tomoyo_profile(const u8 profile)
{
static struct tomoyo_profile tomoyo_null_profile;
struct tomoyo_profile *ptr = tomoyo_profile_ptr[profile];
if (!ptr)
ptr = &tomoyo_null_profile;
return ptr;
}
/**
* tomoyo_find_yesno - Find values for specified keyword.
*
* @string: String to check.
* @find: Name of keyword.
*
* Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
*/
static s8 tomoyo_find_yesno(const char *string, const char *find)
{
const char *cp = strstr(string, find);
if (cp) {
cp += strlen(find);
if (!strncmp(cp, "=yes", 4))
return 1;
else if (!strncmp(cp, "=no", 3))
return 0;
}
return -1;
}
/**
* tomoyo_set_uint - Set value for specified preference.
*
* @i: Pointer to "unsigned int".
* @string: String to check.
* @find: Name of keyword.
*
* Returns nothing.
*/
static void tomoyo_set_uint(unsigned int *i, const char *string,
const char *find)
{
const char *cp = strstr(string, find);
if (cp)
sscanf(cp + strlen(find), "=%u", i);
}
/**
* tomoyo_set_mode - Set mode for specified profile.
*
* @name: Name of functionality.
* @value: Mode for @name.
* @profile: Pointer to "struct tomoyo_profile".
*
* Returns 0 on success, negative value otherwise.
*/
static int tomoyo_set_mode(char *name, const char *value,
struct tomoyo_profile *profile)
{
u8 i;
u8 config;
if (!strcmp(name, "CONFIG")) {
i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
config = profile->default_config;
} else if (tomoyo_str_starts(&name, "CONFIG::")) {
config = 0;
for (i = 0; i < TOMOYO_MAX_MAC_INDEX
+ TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
if (strcmp(name, tomoyo_mac_keywords[i]))
continue;
config = profile->config[i];
break;
}
if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
return -EINVAL;
} else {
return -EINVAL;
}
if (strstr(value, "use_default")) {
config = TOMOYO_CONFIG_USE_DEFAULT;
} else {
u8 mode;
for (mode = 0; mode < 4; mode++)
if (strstr(value, tomoyo_mode[mode]))
/*
* Update lower 3 bits in order to distinguish
* 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
*/
config = (config & ~7) | mode;
if (config != TOMOYO_CONFIG_USE_DEFAULT) {
switch (tomoyo_find_yesno(value, "grant_log")) {
case 1:
config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
break;
case 0:
config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
break;
}
switch (tomoyo_find_yesno(value, "reject_log")) {
case 1:
config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
break;
case 0:
config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
break;
}
}
}
if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
profile->config[i] = config;
else if (config != TOMOYO_CONFIG_USE_DEFAULT)
profile->default_config = config;
return 0;
}
/**
* tomoyo_write_profile - Write profile table.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Returns 0 on success, negative value otherwise.
*/
static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
{
char *data = head->write_buf;
unsigned int i;
char *cp;
struct tomoyo_profile *profile;
if (sscanf(data, "PROFILE_VERSION=%u", &tomoyo_profile_version) == 1)
return 0;
i = simple_strtoul(data, &cp, 10);
if (*cp != '-')
return -EINVAL;
data = cp + 1;
profile = tomoyo_assign_profile(i);
if (!profile)
return -EINVAL;
cp = strchr(data, '=');
if (!cp)
return -EINVAL;
*cp++ = '\0';
if (!strcmp(data, "COMMENT")) {
static DEFINE_SPINLOCK(lock);
const struct tomoyo_path_info *new_comment
= tomoyo_get_name(cp);
const struct tomoyo_path_info *old_comment;
if (!new_comment)
return -ENOMEM;
spin_lock(&lock);
old_comment = profile->comment;
profile->comment = new_comment;
spin_unlock(&lock);
tomoyo_put_name(old_comment);
return 0;
}
if (!strcmp(data, "PREFERENCE")) {
for (i = 0; i < TOMOYO_MAX_PREF; i++)
tomoyo_set_uint(&profile->pref[i], cp,
tomoyo_pref_keywords[i]);
return 0;
}
return tomoyo_set_mode(data, cp, profile);
}
/**
* tomoyo_print_config - Print mode for specified functionality.
*
* @head: Pointer to "struct tomoyo_io_buffer".
* @config: Mode for that functionality.
*
* Returns nothing.
*
* Caller prints functionality's name.
*/
static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
{
tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
tomoyo_mode[config & 3],
tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
}
/**
* tomoyo_read_profile - Read profile table.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Returns nothing.
*/
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=%u\n", 20090903);
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:
{
u8 i;
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);
tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
for (i = 0; i < TOMOYO_MAX_PREF; i++)
tomoyo_io_printf(head, "%s=%u ",
tomoyo_pref_keywords[i],
profile->pref[i]);
tomoyo_set_string(head, "}\n");
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) {
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 = { };
struct tomoyo_acl_param param = {
.is_delete = is_delete,
.list = &tomoyo_policy_list[TOMOYO_ID_MANAGER],
};
int error = is_delete ? -ENOENT : -ENOMEM;
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) {
error = tomoyo_update_policy(&e.head, sizeof(e), &param,
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, "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->w.domain = 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.
*
* @list: Pointer to "struct list_head".
* @data: Policy to be interpreted.
* @is_delete: True if it is a delete request.
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_write_domain2(struct list_head *list, char *data,
const bool is_delete)
{
struct tomoyo_acl_param param = {
.list = list,
.data = data,
.is_delete = is_delete,
};
static const struct {
const char *keyword;
int (*write) (struct tomoyo_acl_param *);
} tomoyo_callback[1] = {
{ "file ", tomoyo_write_file },
};
u8 i;
for (i = 0; i < 1; i++) {
if (!tomoyo_str_starts(&param.data,
tomoyo_callback[i].keyword))
continue;
return tomoyo_callback[i].write(&param);
}
return -EINVAL;
}
/**
* 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->w.domain;
bool is_delete = false;
bool is_select = false;
unsigned int profile;
if (tomoyo_str_starts(&data, "delete "))
is_delete = true;
else if (tomoyo_str_starts(&data, "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->w.domain = domain;
return 0;
}
if (!domain)
return -EINVAL;
if (sscanf(data, "use_profile %u", &profile) == 1
&& profile < TOMOYO_MAX_PROFILES) {
if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
domain->profile = (u8) profile;
return 0;
}
if (sscanf(data, "use_group %u\n", &profile) == 1
&& profile < TOMOYO_MAX_ACL_GROUPS) {
if (!is_delete)
domain->group = (u8) profile;
return 0;
}
if (!strcmp(data, "quota_exceeded")) {
domain->quota_warned = !is_delete;
return 0;
}
if (!strcmp(data, "transition_failed")) {
domain->transition_failed = !is_delete;
return 0;
}
return tomoyo_write_domain2(&domain->acl_info_list, data, is_delete);
}
/**
* tomoyo_set_group - Print "acl_group " header keyword and category name.
*
* @head: Pointer to "struct tomoyo_io_buffer".
* @category: Category name.
*
* Returns nothing.
*/
static void tomoyo_set_group(struct tomoyo_io_buffer *head,
const char *category)
{
if (head->type == TOMOYO_EXCEPTIONPOLICY)
tomoyo_io_printf(head, "acl_group %u ",
head->r.acl_group_index);
tomoyo_set_string(head, category);
}
/**
* 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;
bool first = true;
u8 bit;
if (acl->is_deleted)
return true;
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 = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
if (!(perm & (1 << bit)))
continue;
if (head->r.print_execute_only &&
bit != TOMOYO_TYPE_EXECUTE)
continue;
if (first) {
tomoyo_set_group(head, "file ");
first = false;
} else {
tomoyo_set_slash(head);
}
tomoyo_set_string(head, tomoyo_path_keyword[bit]);
}
if (first)
return true;
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);
const u8 perm = ptr->perm;
for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
if (!(perm & (1 << bit)))
continue;
if (first) {
tomoyo_set_group(head, "file ");
first = false;
} else {
tomoyo_set_slash(head);
}
tomoyo_set_string(head, tomoyo_mac_keywords
[tomoyo_pp2mac[bit]]);
}
if (first)
return true;
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);
const u8 perm = ptr->perm;
for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
if (!(perm & (1 << bit)))
continue;
if (first) {
tomoyo_set_group(head, "file ");
first = false;
} else {
tomoyo_set_slash(head);
}
tomoyo_set_string(head, tomoyo_mac_keywords
[tomoyo_pn2mac[bit]]);
}
if (first)
return true;
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);
const u8 perm = ptr->perm;
for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
if (!(perm & (1 << bit)))
continue;
if (first) {
tomoyo_set_group(head, "file ");
first = false;
} else {
tomoyo_set_slash(head);
}
tomoyo_set_string(head, tomoyo_mac_keywords
[tomoyo_pnnn2mac[bit]]);
}
if (first)
return true;
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_set_group(head, "file 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);
}
tomoyo_set_lf(head);
return true;
}
/**
* tomoyo_read_domain2 - Read domain policy.
*
* @head: Pointer to "struct tomoyo_io_buffer".
* @list: Pointer to "struct list_head".
*
* Caller holds tomoyo_read_lock().
*
* Returns true on success, false otherwise.
*/
static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
struct list_head *list)
{
list_for_each_cookie(head->r.acl, 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, "use_profile %u\n",
domain->profile);
tomoyo_io_printf(head, "use_group %u\n",
domain->group);
if (domain->quota_warned)
tomoyo_set_string(head, "quota_exceeded\n");
if (domain->transition_failed)
tomoyo_set_string(head, "transition_failed\n");
head->r.step++;
tomoyo_set_lf(head);
/* fall through */
case 1:
if (!tomoyo_read_domain2(head, &domain->acl_info_list))
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] = "no_initialize_domain",
[TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain",
[TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain",
[TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain",
};
static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
[TOMOYO_PATH_GROUP] = "path_group ",
[TOMOYO_NUMBER_GROUP] = "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)
{
struct tomoyo_acl_param param = {
.data = head->write_buf,
};
u8 i;
param.is_delete = tomoyo_str_starts(&param.data, "delete ");
if (!param.is_delete && tomoyo_str_starts(&param.data, "select ") &&
!strcmp(param.data, "execute_only")) {
head->r.print_execute_only = true;
return 0;
}
/* Don't allow updating policies by non manager programs. */
if (!tomoyo_manager())
return -EPERM;
if (tomoyo_str_starts(&param.data, "aggregator "))
return tomoyo_write_aggregator(&param);
for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
return tomoyo_write_transition_control(&param, i);
for (i = 0; i < TOMOYO_MAX_GROUP; i++)
if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
return tomoyo_write_group(&param, i);
if (tomoyo_str_starts(&param.data, "acl_group ")) {
unsigned int group;
char *data;
group = simple_strtoul(param.data, &data, 10);
if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
return tomoyo_write_domain2(&tomoyo_acl_group[group],
data, param.is_delete);
}
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), head.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]);
tomoyo_set_string(head, ptr->program ?
ptr->program->name : "any");
tomoyo_set_string(head, " from ");
tomoyo_set_string(head, ptr->domainname ?
ptr->domainname->name :
"any");
}
break;
case TOMOYO_ID_AGGREGATOR:
{
struct tomoyo_aggregator *ptr =
container_of(acl, typeof(*ptr), head);
tomoyo_set_string(head, "aggregator ");
tomoyo_set_string(head,
ptr->original_name->name);
tomoyo_set_space(head);
tomoyo_set_string(head,
ptr->aggregated_name->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;
while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
+ TOMOYO_MAX_ACL_GROUPS) {
head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
- TOMOYO_MAX_GROUP;
if (!tomoyo_read_domain2(head, &tomoyo_acl_group
[head->r.acl_group_index]))
return;
head->r.step++;
}
head->r.eof = true;
}
/* Wait queue for kernel -> userspace notification. */
static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
/* Wait queue for userspace -> kernel notification. */
static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
/* Structure for query. */
struct tomoyo_query {
struct list_head list;
char *query;
size_t query_len;
unsigned int serial;
u8 timer;
u8 answer;
u8 retry;
};
/* The list for "struct tomoyo_query". */
static LIST_HEAD(tomoyo_query_list);
/* Lock for manipulating tomoyo_query_list. */
static DEFINE_SPINLOCK(tomoyo_query_list_lock);
/*
* Number of "struct file" referring /sys/kernel/security/tomoyo/query
* interface.
*/
static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
/**
* tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
*
* @domain: Pointer to "struct tomoyo_domain_info".
* @header: Lines containing ACL.
*
* Returns nothing.
*/
static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
{
char *buffer;
char *cp = strchr(header, '\n');
int len;
if (!cp)
return;
cp = strchr(cp + 1, '\n');
if (!cp)
return;
*cp++ = '\0';
len = strlen(cp) + 1;
buffer = kmalloc(len, GFP_NOFS);
if (!buffer)
return;
snprintf(buffer, len - 1, "%s", cp);
tomoyo_normalize_line(buffer);
tomoyo_write_domain2(&domain->acl_info_list, buffer, false);
kfree(buffer);
}
/**
* 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;
int len;
static unsigned int tomoyo_serial;
struct tomoyo_query entry = { };
bool quota_exceeded = false;
va_start(args, fmt);
len = vsnprintf((char *) &len, 1, fmt, args) + 1;
va_end(args);
/* Write /sys/kernel/security/tomoyo/audit. */
va_start(args, fmt);
tomoyo_write_log2(r, len, fmt, args);
va_end(args);
/* Nothing more to do if granted. */
if (r->granted)
return 0;
switch (r->mode) {
case TOMOYO_CONFIG_ENFORCING:
error = -EPERM;
if (atomic_read(&tomoyo_query_observers))
break;
goto out;
case TOMOYO_CONFIG_LEARNING:
error = 0;
/* Check max_learning_entry parameter. */
if (tomoyo_domain_quota_is_ok(r))
break;
/* fall through */
default:
return 0;
}
/* Get message. */
va_start(args, fmt);
entry.query = tomoyo_init_log(r, len, fmt, args);
va_end(args);
if (!entry.query)
goto out;
entry.query_len = strlen(entry.query) + 1;
if (!error) {
tomoyo_add_entry(r->domain, entry.query);
goto out;
}
len = tomoyo_round2(entry.query_len);
spin_lock(&tomoyo_query_list_lock);
if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
>= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
quota_exceeded = true;
} else {
entry.serial = tomoyo_serial++;
entry.retry = r->retry;
tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
list_add_tail(&entry.list, &tomoyo_query_list);
}
spin_unlock(&tomoyo_query_list_lock);
if (quota_exceeded)
goto out;
/* Give 10 seconds for supervisor's opinion. */
while (entry.timer < 10) {
wake_up_all(&tomoyo_query_wait);
if (wait_event_interruptible_timeout
(tomoyo_answer_wait, entry.answer ||
!atomic_read(&tomoyo_query_observers), HZ))
break;
else
entry.timer++;
}
spin_lock(&tomoyo_query_list_lock);
list_del(&entry.list);
tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
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;
default:
/* Timed out or rejected by administrator. */
break;
}
out:
kfree(entry.query);
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 + 32, 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)
snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
ptr->retry, ptr->query);
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, "2.4.0");
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_AUDIT:
/* /sys/kernel/security/tomoyo/audit */
head->poll = tomoyo_poll_log;
head->read = tomoyo_read_log;
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 && type != TOMOYO_AUDIT)
head->reader_idx = tomoyo_read_lock();
file->private_data = head;
/*
* 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.
*/
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 and
* /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd.
*/
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.
*
* @head: Pointer to "struct tomoyo_io_buffer".
* @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 tomoyo_io_buffer *head, char __user *buffer,
const int buffer_len)
{
int len;
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.
*
* @head: Pointer to "struct tomoyo_io_buffer".
* @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 tomoyo_io_buffer *head,
const char __user *buffer, const int buffer_len)
{
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 &&
head->write != tomoyo_write_exception && !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->w.avail >= head->writebuf_size - 1) {
error = -ENOMEM;
break;
} else if (get_user(c, buffer)) {
error = -EFAULT;
break;
}
buffer++;
avail_len--;
cp0[head->w.avail++] = c;
if (c != '\n')
continue;
cp0[head->w.avail - 1] = '\0';
head->w.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.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Releases memory and returns 0.
*
* Caller looses tomoyo_read_lock().
*/
int tomoyo_close_control(struct tomoyo_io_buffer *head)
{
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 if (head->type != TOMOYO_AUDIT)
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);
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");
}
Reference in New Issue View Git Blame Copy Permalink