/*
* 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"
static struct tomoyo_profile tomoyo_default_profile = {
.learning = &tomoyo_default_profile.preference,
.permissive = &tomoyo_default_profile.preference,
.enforcing = &tomoyo_default_profile.preference,
.preference.enforcing_verbose = true,
.preference.learning_max_entry = 2048,
.preference.learning_verbose = false,
.preference.permissive_verbose = true
};
/* 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 functionality that takes 4 modes. */
static const char *tomoyo_mode_4[4] = {
"disabled", "learning", "permissive", "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_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_REWRITE] = "file::rewrite",
[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::umount",
[TOMOYO_MAC_FILE_PIVOT_ROOT] = "file::pivot_root",
[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
};
/* 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.
*/
static const char *tomoyo_yesno(const unsigned int value)
{
return value ? "yes" : "no";
}
/**
* tomoyo_print_name_union - Print a tomoyo_name_union.
*
* @head: Pointer to "struct tomoyo_io_buffer".
* @ptr: Pointer to "struct tomoyo_name_union".
*
* Returns true on success, false otherwise.
*/
static bool tomoyo_print_name_union(struct tomoyo_io_buffer *head,
const struct tomoyo_name_union *ptr)
{
int pos = head->read_avail;
if (pos && head->read_buf[pos - 1] == ' ')
head->read_avail--;
if (ptr->is_group)
return tomoyo_io_printf(head, " @%s",
ptr->group->group_name->name);
return tomoyo_io_printf(head, " %s", 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".
*
* Returns true on success, false otherwise.
*/
bool tomoyo_print_number_union(struct tomoyo_io_buffer *head,
const struct tomoyo_number_union *ptr)
{
unsigned long min;
unsigned long max;
u8 min_type;
u8 max_type;
if (!tomoyo_io_printf(head, " "))
return false;
if (ptr->is_group)
return tomoyo_io_printf(head, "@%s",
ptr->group->group_name->name);
min_type = ptr->min_type;
max_type = ptr->max_type;
min = ptr->values[0];
max = ptr->values[1];
switch (min_type) {
case TOMOYO_VALUE_TYPE_HEXADECIMAL:
if (!tomoyo_io_printf(head, "0x%lX", min))
return false;
break;
case TOMOYO_VALUE_TYPE_OCTAL:
if (!tomoyo_io_printf(head, "0%lo", min))
return false;
break;
default:
if (!tomoyo_io_printf(head, "%lu", min))
return false;
break;
}
if (min == max && min_type == max_type)
return true;
switch (max_type) {
case TOMOYO_VALUE_TYPE_HEXADECIMAL:
return tomoyo_io_printf(head, "-0x%lX", max);
case TOMOYO_VALUE_TYPE_OCTAL:
return tomoyo_io_printf(head, "-0%lo", max);
default:
return tomoyo_io_printf(head, "-%lu", max);
}
}
/**
* tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure.
*
* @head: Pointer to "struct tomoyo_io_buffer".
* @fmt: The printf()'s format string, followed by parameters.
*
* Returns true if output was written, false otherwise.
*
* The snprintf() will truncate, but tomoyo_io_printf() won't.
*/
bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
{
va_list args;
int len;
int pos = head->read_avail;
int size = head->readbuf_size - pos;
if (size <= 0)
return false;
va_start(args, fmt);
len = vsnprintf(head->read_buf + pos, size, fmt, args);
va_end(args);
if (pos + len >= head->readbuf_size)
return false;
head->read_avail += len;
return true;
}
/**
* tomoyo_find_or_assign_new_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_find_or_assign_new_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->learning = &tomoyo_default_profile.preference;
ptr->permissive = &tomoyo_default_profile.preference;
ptr->enforcing = &tomoyo_default_profile.preference;
ptr->default_config = TOMOYO_CONFIG_DISABLED;
memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
sizeof(ptr->config));
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)
{
struct tomoyo_profile *ptr = tomoyo_profile_ptr[profile];
if (!tomoyo_policy_loaded)
return &tomoyo_default_profile;
BUG_ON(!ptr);
return ptr;
}
/**
* 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;
int value;
int mode;
u8 config;
bool use_default = false;
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 (data == cp) {
profile = &tomoyo_default_profile;
} else {
if (*cp != '-')
return -EINVAL;
data = cp + 1;
profile = tomoyo_find_or_assign_new_profile(i);
if (!profile)
return -EINVAL;
}
cp = strchr(data, '=');
if (!cp)
return -EINVAL;
*cp++ = '\0';
if (profile != &tomoyo_default_profile)
use_default = strstr(cp, "use_default") != NULL;
if (strstr(cp, "verbose=yes"))
value = 1;
else if (strstr(cp, "verbose=no"))
value = 0;
else
value = -1;
if (!strcmp(data, "PREFERENCE::enforcing")) {
if (use_default) {
profile->enforcing = &tomoyo_default_profile.preference;
return 0;
}
profile->enforcing = &profile->preference;
if (value >= 0)
profile->preference.enforcing_verbose = value;
return 0;
}
if (!strcmp(data, "PREFERENCE::permissive")) {
if (use_default) {
profile->permissive = &tomoyo_default_profile.preference;
return 0;
}
profile->permissive = &profile->preference;
if (value >= 0)
profile->preference.permissive_verbose = value;
return 0;
}
if (!strcmp(data, "PREFERENCE::learning")) {
char *cp2;
if (use_default) {
profile->learning = &tomoyo_default_profile.preference;
return 0;
}
profile->learning = &profile->preference;
if (value >= 0)
profile->preference.learning_verbose = value;
cp2 = strstr(cp, "max_entry=");
if (cp2)
sscanf(cp2 + 10, "%u",
&profile->preference.learning_max_entry);
return 0;
}
if (profile == &tomoyo_default_profile)
return -EINVAL;
if (!strcmp(data, "COMMENT")) {
const struct tomoyo_path_info *old_comment = profile->comment;
profile->comment = tomoyo_get_name(cp);
tomoyo_put_name(old_comment);
return 0;
}
if (!strcmp(data, "CONFIG")) {
i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
config = profile->default_config;
} else if (tomoyo_str_starts(&data, "CONFIG::")) {
config = 0;
for (i = 0; i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
if (strcmp(data, 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 (use_default) {
config = TOMOYO_CONFIG_USE_DEFAULT;
} else {
for (mode = 3; mode >= 0; mode--)
if (strstr(cp, tomoyo_mode_4[mode]))
/*
* Update lower 3 bits in order to distinguish
* 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
*/
config = (config & ~7) | mode;
}
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_read_profile - Read profile table.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Returns 0.
*/
static int tomoyo_read_profile(struct tomoyo_io_buffer *head)
{
int index;
if (head->read_eof)
return 0;
if (head->read_bit)
goto body;
tomoyo_io_printf(head, "PROFILE_VERSION=%s\n", "20090903");
tomoyo_io_printf(head, "PREFERENCE::learning={ verbose=%s "
"max_entry=%u }\n",
tomoyo_yesno(tomoyo_default_profile.preference.
learning_verbose),
tomoyo_default_profile.preference.learning_max_entry);
tomoyo_io_printf(head, "PREFERENCE::permissive={ verbose=%s }\n",
tomoyo_yesno(tomoyo_default_profile.preference.
permissive_verbose));
tomoyo_io_printf(head, "PREFERENCE::enforcing={ verbose=%s }\n",
tomoyo_yesno(tomoyo_default_profile.preference.
enforcing_verbose));
head->read_bit = 1;
body:
for (index = head->read_step; index < TOMOYO_MAX_PROFILES; index++) {
bool done;
u8 config;
int i;
int pos;
const struct tomoyo_profile *profile
= tomoyo_profile_ptr[index];
const struct tomoyo_path_info *comment;
head->read_step = index;
if (!profile)
continue;
pos = head->read_avail;
comment = profile->comment;
done = tomoyo_io_printf(head, "%u-COMMENT=%s\n", index,
comment ? comment->name : "");
if (!done)
goto out;
config = profile->default_config;
if (!tomoyo_io_printf(head, "%u-CONFIG={ mode=%s }\n", index,
tomoyo_mode_4[config & 3]))
goto out;
for (i = 0; i < TOMOYO_MAX_MAC_INDEX +
TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
config = profile->config[i];
if (config == TOMOYO_CONFIG_USE_DEFAULT)
continue;
if (!tomoyo_io_printf(head,
"%u-CONFIG::%s={ mode=%s }\n",
index, tomoyo_mac_keywords[i],
tomoyo_mode_4[config & 3]))
goto out;
}
if (profile->learning != &tomoyo_default_profile.preference &&
!tomoyo_io_printf(head, "%u-PREFERENCE::learning={ "
"verbose=%s max_entry=%u }\n", index,
tomoyo_yesno(profile->preference.
learning_verbose),
profile->preference.learning_max_entry))
goto out;
if (profile->permissive != &tomoyo_default_profile.preference
&& !tomoyo_io_printf(head, "%u-PREFERENCE::permissive={ "
"verbose=%s }\n", index,
tomoyo_yesno(profile->preference.
permissive_verbose)))
goto out;
if (profile->enforcing != &tomoyo_default_profile.preference &&
!tomoyo_io_printf(head, "%u-PREFERENCE::enforcing={ "
"verbose=%s }\n", index,
tomoyo_yesno(profile->preference.
enforcing_verbose)))
goto out;
continue;
out:
head->read_avail = pos;
break;
}
if (index == TOMOYO_MAX_PROFILES)
head->read_eof = true;
return 0;
}
/*
* tomoyo_policy_manager_list is used for holding list of domainnames or
* programs which are permitted to modify configuration via
* /sys/kernel/security/tomoyo/ interface.
*
* An entry is added by
*
* # echo '<kernel> /sbin/mingetty /bin/login /bin/bash' > \
* /sys/kernel/security/tomoyo/manager
* (if you want to specify by a domainname)
*
* or
*
* # echo '/usr/sbin/tomoyo-editpolicy' > /sys/kernel/security/tomoyo/manager
* (if you want to specify by a program's location)
*
* and is deleted by
*
* # echo 'delete <kernel> /sbin/mingetty /bin/login /bin/bash' > \
* /sys/kernel/security/tomoyo/manager
*
* or
*
* # echo 'delete /usr/sbin/tomoyo-editpolicy' > \
* /sys/kernel/security/tomoyo/manager
*
* and all entries are retrieved by
*
* # cat /sys/kernel/security/tomoyo/manager
*/
LIST_HEAD(tomoyo_policy_manager_list);
static bool tomoyo_same_manager_entry(const struct tomoyo_acl_head *a,
const struct tomoyo_acl_head *b)
{
return container_of(a, struct tomoyo_policy_manager_entry, head)
->manager ==
container_of(b, struct tomoyo_policy_manager_entry, 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_policy_manager_entry 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_manager_list,
tomoyo_same_manager_entry);
tomoyo_put_name(e.manager);
return error;
}
/**
* tomoyo_write_manager_policy - 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_policy(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_policy - Read manager policy.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Returns 0.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head)
{
struct list_head *pos;
bool done = true;
if (head->read_eof)
return 0;
list_for_each_cookie(pos, head->read_var2,
&tomoyo_policy_manager_list) {
struct tomoyo_policy_manager_entry *ptr;
ptr = list_entry(pos, struct tomoyo_policy_manager_entry,
head.list);
if (ptr->head.is_deleted)
continue;
done = tomoyo_io_printf(head, "%s\n", ptr->manager->name);
if (!done)
break;
}
head->read_eof = done;
return 0;
}
/**
* tomoyo_policy_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_policy_manager(void)
{
struct tomoyo_policy_manager_entry *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_manager_list, 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_manager_list, 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 (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). */
head->read_avail = 0;
tomoyo_io_printf(head, "# select %s\n", data);
head->read_single_domain = true;
head->read_eof = !domain;
if (domain) {
struct tomoyo_domain_info *d;
head->read_var1 = NULL;
list_for_each_entry_rcu(d, &tomoyo_domain_list, list) {
if (d == domain)
break;
head->read_var1 = &d->list;
}
head->read_var2 = NULL;
head->read_bit = 0;
head->read_step = 0;
if (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_domain_policy2 - 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_policy2(char *data,
struct tomoyo_domain_info *domain,
const bool is_delete)
{
if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT))
return tomoyo_write_mount_policy(data, domain, is_delete);
return tomoyo_write_file_policy(data, domain, is_delete);
}
/**
* tomoyo_write_domain_policy - 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_policy(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_policy_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_find_or_assign_new_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_domain_policy2(data, domain, is_delete);
}
/**
* tomoyo_print_path_acl - Print a single path ACL entry.
*
* @head: Pointer to "struct tomoyo_io_buffer".
* @ptr: Pointer to "struct tomoyo_path_acl".
*
* Returns true on success, false otherwise.
*/
static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head,
struct tomoyo_path_acl *ptr)
{
int pos;
u8 bit;
const u16 perm = ptr->perm;
for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
if (!(perm & (1 << bit)))
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;
pos = head->read_avail;
if (!tomoyo_io_printf(head, "allow_%s ",
tomoyo_path_keyword[bit]) ||
!tomoyo_print_name_union(head, &ptr->name) ||
!tomoyo_io_printf(head, "\n"))
goto out;
}
head->read_bit = 0;
return true;
out:
head->read_bit = bit;
head->read_avail = pos;
return false;
}
/**
* tomoyo_print_path2_acl - Print a double path ACL entry.
*
* @head: Pointer to "struct tomoyo_io_buffer".
* @ptr: Pointer to "struct tomoyo_path2_acl".
*
* Returns true on success, false otherwise.
*/
static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head,
struct tomoyo_path2_acl *ptr)
{
int pos;
const u8 perm = ptr->perm;
u8 bit;
for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
if (!(perm & (1 << bit)))
continue;
pos = head->read_avail;
if (!tomoyo_io_printf(head, "allow_%s ",
tomoyo_path2_keyword[bit]) ||
!tomoyo_print_name_union(head, &ptr->name1) ||
!tomoyo_print_name_union(head, &ptr->name2) ||
!tomoyo_io_printf(head, "\n"))
goto out;
}
head->read_bit = 0;
return true;
out:
head->read_bit = bit;
head->read_avail = pos;
return false;
}
/**
* tomoyo_print_path_number_acl - Print a path_number ACL entry.
*
* @head: Pointer to "struct tomoyo_io_buffer".
* @ptr: Pointer to "struct tomoyo_path_number_acl".
*
* Returns true on success, false otherwise.
*/
static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head,
struct tomoyo_path_number_acl *ptr)
{
int pos;
u8 bit;
const u8 perm = ptr->perm;
for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION;
bit++) {
if (!(perm & (1 << bit)))
continue;
pos = head->read_avail;
if (!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) ||
!tomoyo_io_printf(head, "\n"))
goto out;
}
head->read_bit = 0;
return true;
out:
head->read_bit = bit;
head->read_avail = pos;
return false;
}
/**
* tomoyo_print_mkdev_acl - Print a mkdev ACL entry.
*
* @head: Pointer to "struct tomoyo_io_buffer".
* @ptr: Pointer to "struct tomoyo_mkdev_acl".
*
* Returns true on success, false otherwise.
*/
static bool tomoyo_print_mkdev_acl(struct tomoyo_io_buffer *head,
struct tomoyo_mkdev_acl *ptr)
{
int pos;
u8 bit;
const u16 perm = ptr->perm;
for (bit = head->read_bit; bit < TOMOYO_MAX_MKDEV_OPERATION;
bit++) {
if (!(perm & (1 << bit)))
continue;
pos = head->read_avail;
if (!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) ||
!tomoyo_io_printf(head, "\n"))
goto out;
}
head->read_bit = 0;
return true;
out:
head->read_bit = bit;
head->read_avail = pos;
return false;
}
/**
* tomoyo_print_mount_acl - Print a mount ACL entry.
*
* @head: Pointer to "struct tomoyo_io_buffer".
* @ptr: Pointer to "struct tomoyo_mount_acl".
*
* Returns true on success, false otherwise.
*/
static bool tomoyo_print_mount_acl(struct tomoyo_io_buffer *head,
struct tomoyo_mount_acl *ptr)
{
const int pos = head->read_avail;
if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_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) ||
!tomoyo_io_printf(head, "\n")) {
head->read_avail = pos;
return false;
}
return true;
}
/**
* tomoyo_print_entry - Print an ACL entry.
*
* @head: Pointer to "struct tomoyo_io_buffer".
* @ptr: 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 *ptr)
{
const u8 acl_type = ptr->type;
if (ptr->is_deleted)
return true;
if (acl_type == TOMOYO_TYPE_PATH_ACL) {
struct tomoyo_path_acl *acl
= container_of(ptr, struct tomoyo_path_acl, head);
return tomoyo_print_path_acl(head, acl);
}
if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
struct tomoyo_path2_acl *acl
= container_of(ptr, struct tomoyo_path2_acl, head);
return tomoyo_print_path2_acl(head, acl);
}
if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
struct tomoyo_path_number_acl *acl
= container_of(ptr, struct tomoyo_path_number_acl,
head);
return tomoyo_print_path_number_acl(head, acl);
}
if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
struct tomoyo_mkdev_acl *acl
= container_of(ptr, struct tomoyo_mkdev_acl,
head);
return tomoyo_print_mkdev_acl(head, acl);
}
if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
struct tomoyo_mount_acl *acl
= container_of(ptr, struct tomoyo_mount_acl, head);
return tomoyo_print_mount_acl(head, acl);
}
BUG(); /* This must not happen. */
return false;
}
/**
* tomoyo_read_domain_policy - Read domain policy.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Returns 0.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
{
struct list_head *dpos;
struct list_head *apos;
bool done = true;
if (head->read_eof)
return 0;
if (head->read_step == 0)
head->read_step = 1;
list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) {
struct tomoyo_domain_info *domain;
const char *quota_exceeded = "";
const char *transition_failed = "";
const char *ignore_global_allow_read = "";
domain = list_entry(dpos, struct tomoyo_domain_info, list);
if (head->read_step != 1)
goto acl_loop;
if (domain->is_deleted && !head->read_single_domain)
continue;
/* Print domainname and flags. */
if (domain->quota_warned)
quota_exceeded = "quota_exceeded\n";
if (domain->transition_failed)
transition_failed = "transition_failed\n";
if (domain->ignore_global_allow_read)
ignore_global_allow_read
= TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n";
done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE
"%u\n%s%s%s\n",
domain->domainname->name,
domain->profile, quota_exceeded,
transition_failed,
ignore_global_allow_read);
if (!done)
break;
head->read_step = 2;
acl_loop:
if (head->read_step == 3)
goto tail_mark;
/* Print ACL entries in the domain. */
list_for_each_cookie(apos, head->read_var2,
&domain->acl_info_list) {
struct tomoyo_acl_info *ptr
= list_entry(apos, struct tomoyo_acl_info,
list);
done = tomoyo_print_entry(head, ptr);
if (!done)
break;
}
if (!done)
break;
head->read_step = 3;
tail_mark:
done = tomoyo_io_printf(head, "\n");
if (!done)
break;
head->read_step = 1;
if (head->read_single_domain)
break;
}
head->read_eof = done;
return 0;
}
/**
* 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 int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
{
struct list_head *pos;
bool done = true;
if (head->read_eof)
return 0;
list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) {
struct tomoyo_domain_info *domain;
domain = list_entry(pos, struct tomoyo_domain_info, list);
if (domain->is_deleted)
continue;
done = tomoyo_io_printf(head, "%u %s\n", domain->profile,
domain->domainname->name);
if (!done)
break;
}
head->read_eof = done;
return 0;
}
/**
* 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)
{
unsigned long pid;
/* No error check. */
strict_strtoul(head->write_buf, 10, &pid);
head->read_step = (int) pid;
head->read_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 int tomoyo_read_pid(struct tomoyo_io_buffer *head)
{
if (head->read_avail == 0 && !head->read_eof) {
const int pid = head->read_step;
struct task_struct *p;
struct tomoyo_domain_info *domain = NULL;
rcu_read_lock();
read_lock(&tasklist_lock);
p = find_task_by_vpid(pid);
if (p)
domain = tomoyo_real_domain(p);
read_unlock(&tasklist_lock);
rcu_read_unlock();
if (domain)
tomoyo_io_printf(head, "%d %u %s", pid, domain->profile,
domain->domainname->name);
head->read_eof = true;
}
return 0;
}
/**
* tomoyo_write_exception_policy - 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_policy(struct tomoyo_io_buffer *head)
{
char *data = head->write_buf;
bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN))
return tomoyo_write_domain_keeper_policy(data, false,
is_delete);
if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN))
return tomoyo_write_domain_keeper_policy(data, true, is_delete);
if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN))
return tomoyo_write_domain_initializer_policy(data, false,
is_delete);
if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN))
return tomoyo_write_domain_initializer_policy(data, true,
is_delete);
if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_AGGREGATOR))
return tomoyo_write_aggregator_policy(data, is_delete);
if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS))
return tomoyo_write_alias_policy(data, is_delete);
if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
return tomoyo_write_globally_readable_policy(data, is_delete);
if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
return tomoyo_write_pattern_policy(data, is_delete);
if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
return tomoyo_write_no_rewrite_policy(data, is_delete);
if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP))
return tomoyo_write_path_group_policy(data, is_delete);
if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP))
return tomoyo_write_number_group_policy(data, is_delete);
return -EINVAL;
}
/**
* tomoyo_read_exception_policy - Read exception policy.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Returns 0 on success, -EINVAL otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
{
if (!head->read_eof) {
switch (head->read_step) {
case 0:
head->read_var2 = NULL;
head->read_step = 1;
case 1:
if (!tomoyo_read_domain_keeper_policy(head))
break;
head->read_var2 = NULL;
head->read_step = 2;
case 2:
if (!tomoyo_read_globally_readable_policy(head))
break;
head->read_var2 = NULL;
head->read_step = 3;
case 3:
head->read_var2 = NULL;
head->read_step = 4;
case 4:
if (!tomoyo_read_domain_initializer_policy(head))
break;
head->read_var2 = NULL;
head->read_step = 5;
case 5:
if (!tomoyo_read_alias_policy(head))
break;
head->read_var2 = NULL;
head->read_step = 6;
case 6:
if (!tomoyo_read_aggregator_policy(head))
break;
head->read_var2 = NULL;
head->read_step = 7;
case 7:
if (!tomoyo_read_file_pattern(head))
break;
head->read_var2 = NULL;
head->read_step = 8;
case 8:
if (!tomoyo_read_no_rewrite_policy(head))
break;
head->read_var2 = NULL;
head->read_step = 9;
case 9:
if (!tomoyo_read_path_group_policy(head))
break;
head->read_var1 = NULL;
head->read_var2 = NULL;
head->read_step = 10;
case 10:
if (!tomoyo_read_number_group_policy(head))
break;
head->read_var1 = NULL;
head->read_var2 = NULL;
head->read_step = 11;
case 11:
head->read_eof = true;
break;
default:
return -EINVAL;
}
}
return 0;
}
/**
* 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)
{
static const char *tomoyo_mode_4[4] = {
"disabled", "learning", "permissive", "enforcing"
};
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);
if (!buffer)
return NULL;
do_gettimeofday(&tv);
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_4[r->mode], gpid,
(pid_t) sys_getpid(), (pid_t) sys_getppid(),
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_entry {
struct list_head list;
char *query;
int query_len;
unsigned int serial;
int timer;
int answer;
};
/* The list for "struct tomoyo_query_entry". */
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 *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_domain_policy2(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;
tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS);
if (!tomoyo_query_entry)
goto out;
tomoyo_query_entry->query = kzalloc(len, GFP_NOFS);
if (!tomoyo_query_entry->query)
goto out;
len = ksize(tomoyo_query_entry->query);
INIT_LIST_HEAD(&tomoyo_query_entry->list);
spin_lock(&tomoyo_query_list_lock);
if (tomoyo_quota_for_query && tomoyo_query_memory_size + len +
sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) {
quota_exceeded = true;
} else {
tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry);
tomoyo_query_entry->serial = tomoyo_serial++;
}
spin_unlock(&tomoyo_query_list_lock);
if (quota_exceeded)
goto out;
pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s",
tomoyo_query_entry->serial, r->retry, header);
kfree(header);
header = NULL;
va_start(args, fmt);
vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args);
tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1;
va_end(args);
spin_lock(&tomoyo_query_list_lock);
list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list);
spin_unlock(&tomoyo_query_list_lock);
/* Give 10 seconds for supervisor's opinion. */
for (tomoyo_query_entry->timer = 0;
atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100;
tomoyo_query_entry->timer++) {
wake_up(&tomoyo_query_wait);
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(HZ / 10);
if (tomoyo_query_entry->answer)
break;
}
spin_lock(&tomoyo_query_list_lock);
list_del(&tomoyo_query_entry->list);
tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry);
spin_unlock(&tomoyo_query_list_lock);
switch (tomoyo_query_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 (tomoyo_query_entry)
kfree(tomoyo_query_entry->query);
kfree(tomoyo_query_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_entry *ptr
= list_entry(tmp, struct tomoyo_query_entry,
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".
*
* Returns 0.
*/
static int tomoyo_read_query(struct tomoyo_io_buffer *head)
{
struct list_head *tmp;
int pos = 0;
int len = 0;
char *buf;
if (head->read_avail)
return 0;
if (head->read_buf) {
kfree(head->read_buf);
head->read_buf = NULL;
head->readbuf_size = 0;
}
spin_lock(&tomoyo_query_list_lock);
list_for_each(tmp, &tomoyo_query_list) {
struct tomoyo_query_entry *ptr
= list_entry(tmp, struct tomoyo_query_entry, list);
if (ptr->answer)
continue;
if (pos++ != head->read_step)
continue;
len = ptr->query_len;
break;
}
spin_unlock(&tomoyo_query_list_lock);
if (!len) {
head->read_step = 0;
return 0;
}
buf = kzalloc(len, GFP_NOFS);
if (!buf)
return 0;
pos = 0;
spin_lock(&tomoyo_query_list_lock);
list_for_each(tmp, &tomoyo_query_list) {
struct tomoyo_query_entry *ptr
= list_entry(tmp, struct tomoyo_query_entry, list);
if (ptr->answer)
continue;
if (pos++ != head->read_step)
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_avail = len;
head->readbuf_size = head->read_avail;
head->read_buf = buf;
head->read_step++;
} else {
kfree(buf);
}
return 0;
}
/**
* 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_entry *ptr
= list_entry(tmp, struct tomoyo_query_entry, 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_entry *ptr
= list_entry(tmp, struct tomoyo_query_entry, 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 int tomoyo_read_version(struct tomoyo_io_buffer *head)
{
if (!head->read_eof) {
tomoyo_io_printf(head, "2.3.0-pre");
head->read_eof = true;
}
return 0;
}
/**
* tomoyo_read_self_domain - Get the current process's domainname.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Returns the current process's domainname.
*/
static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
{
if (!head->read_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->read_eof = true;
}
return 0;
}
/**
* 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_policy;
head->read = tomoyo_read_domain_policy;
break;
case TOMOYO_EXCEPTIONPOLICY:
/* /sys/kernel/security/tomoyo/exception_policy */
head->write = tomoyo_write_exception_policy;
head->read = tomoyo_read_exception_policy;
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_policy;
head->read = tomoyo_read_manager_policy;
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 = 0;
struct tomoyo_io_buffer *head = file->private_data;
char *cp;
if (!head->read)
return -ENOSYS;
if (mutex_lock_interruptible(&head->io_sem))
return -EINTR;
/* Call the policy handler. */
len = head->read(head);
if (len < 0)
goto out;
/* Write to buffer. */
len = head->read_avail;
if (len > buffer_len)
len = buffer_len;
if (!len)
goto out;
/* head->read_buf changes by some functions. */
cp = head->read_buf;
if (copy_to_user(buffer, cp, len)) {
len = -EFAULT;
goto out;
}
head->read_avail -= len;
memmove(cp, cp + len, head->read_avail);
out:
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_policy &&
!tomoyo_policy_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;
panic("Profile %u (used by '%s') not defined.\n",
profile, domain->domainname->name);
}
tomoyo_read_unlock(idx);
if (tomoyo_profile_version != 20090903)
panic("Profile version %u is not supported.\n",
tomoyo_profile_version);
printk(KERN_INFO "TOMOYO: 2.3.0-pre 2010/06/03\n");
printk(KERN_INFO "Mandatory Access Control activated.\n");
}
