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linux-stable/security/tomoyo/file.c

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/*
* security/tomoyo/file.c
*
* Pathname restriction functions.
*
* Copyright (C) 2005-2010 NTT DATA CORPORATION
*/
#include "common.h"
#include <linux/slab.h>
/* Keyword array for operations with one pathname. */
static const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
[TOMOYO_TYPE_READ_WRITE] = "read/write",
[TOMOYO_TYPE_EXECUTE] = "execute",
[TOMOYO_TYPE_READ] = "read",
[TOMOYO_TYPE_WRITE] = "write",
[TOMOYO_TYPE_UNLINK] = "unlink",
[TOMOYO_TYPE_RMDIR] = "rmdir",
[TOMOYO_TYPE_TRUNCATE] = "truncate",
[TOMOYO_TYPE_SYMLINK] = "symlink",
[TOMOYO_TYPE_REWRITE] = "rewrite",
[TOMOYO_TYPE_CHROOT] = "chroot",
[TOMOYO_TYPE_UMOUNT] = "unmount",
};
/* Keyword array for operations with one pathname and three numbers. */
static const char *tomoyo_path_number3_keyword
[TOMOYO_MAX_PATH_NUMBER3_OPERATION] = {
[TOMOYO_TYPE_MKBLOCK] = "mkblock",
[TOMOYO_TYPE_MKCHAR] = "mkchar",
};
/* Keyword array for operations with two pathnames. */
static const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION] = {
[TOMOYO_TYPE_LINK] = "link",
[TOMOYO_TYPE_RENAME] = "rename",
[TOMOYO_TYPE_PIVOT_ROOT] = "pivot_root",
};
/* Keyword array for operations with one pathname and one number. */
static const char *tomoyo_path_number_keyword
[TOMOYO_MAX_PATH_NUMBER_OPERATION] = {
[TOMOYO_TYPE_CREATE] = "create",
[TOMOYO_TYPE_MKDIR] = "mkdir",
[TOMOYO_TYPE_MKFIFO] = "mkfifo",
[TOMOYO_TYPE_MKSOCK] = "mksock",
[TOMOYO_TYPE_IOCTL] = "ioctl",
[TOMOYO_TYPE_CHMOD] = "chmod",
[TOMOYO_TYPE_CHOWN] = "chown",
[TOMOYO_TYPE_CHGRP] = "chgrp",
};
static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = {
[TOMOYO_TYPE_READ_WRITE] = TOMOYO_MAC_FILE_OPEN,
[TOMOYO_TYPE_EXECUTE] = TOMOYO_MAC_FILE_EXECUTE,
[TOMOYO_TYPE_READ] = TOMOYO_MAC_FILE_OPEN,
[TOMOYO_TYPE_WRITE] = TOMOYO_MAC_FILE_OPEN,
[TOMOYO_TYPE_UNLINK] = TOMOYO_MAC_FILE_UNLINK,
[TOMOYO_TYPE_RMDIR] = TOMOYO_MAC_FILE_RMDIR,
[TOMOYO_TYPE_TRUNCATE] = TOMOYO_MAC_FILE_TRUNCATE,
[TOMOYO_TYPE_SYMLINK] = TOMOYO_MAC_FILE_SYMLINK,
[TOMOYO_TYPE_REWRITE] = TOMOYO_MAC_FILE_REWRITE,
[TOMOYO_TYPE_CHROOT] = TOMOYO_MAC_FILE_CHROOT,
[TOMOYO_TYPE_UMOUNT] = TOMOYO_MAC_FILE_UMOUNT,
};
static const u8 tomoyo_pnnn2mac[TOMOYO_MAX_PATH_NUMBER3_OPERATION] = {
[TOMOYO_TYPE_MKBLOCK] = TOMOYO_MAC_FILE_MKBLOCK,
[TOMOYO_TYPE_MKCHAR] = TOMOYO_MAC_FILE_MKCHAR,
};
static const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION] = {
[TOMOYO_TYPE_LINK] = TOMOYO_MAC_FILE_LINK,
[TOMOYO_TYPE_RENAME] = TOMOYO_MAC_FILE_RENAME,
[TOMOYO_TYPE_PIVOT_ROOT] = TOMOYO_MAC_FILE_PIVOT_ROOT,
};
static const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION] = {
[TOMOYO_TYPE_CREATE] = TOMOYO_MAC_FILE_CREATE,
[TOMOYO_TYPE_MKDIR] = TOMOYO_MAC_FILE_MKDIR,
[TOMOYO_TYPE_MKFIFO] = TOMOYO_MAC_FILE_MKFIFO,
[TOMOYO_TYPE_MKSOCK] = TOMOYO_MAC_FILE_MKSOCK,
[TOMOYO_TYPE_IOCTL] = TOMOYO_MAC_FILE_IOCTL,
[TOMOYO_TYPE_CHMOD] = TOMOYO_MAC_FILE_CHMOD,
[TOMOYO_TYPE_CHOWN] = TOMOYO_MAC_FILE_CHOWN,
[TOMOYO_TYPE_CHGRP] = TOMOYO_MAC_FILE_CHGRP,
};
void tomoyo_put_name_union(struct tomoyo_name_union *ptr)
{
if (!ptr)
return;
if (ptr->is_group)
tomoyo_put_path_group(ptr->group);
else
tomoyo_put_name(ptr->filename);
}
bool tomoyo_compare_name_union(const struct tomoyo_path_info *name,
const struct tomoyo_name_union *ptr)
{
if (ptr->is_group)
return tomoyo_path_matches_group(name, ptr->group);
return tomoyo_path_matches_pattern(name, ptr->filename);
}
void tomoyo_put_number_union(struct tomoyo_number_union *ptr)
{
if (ptr && ptr->is_group)
tomoyo_put_number_group(ptr->group);
}
bool tomoyo_compare_number_union(const unsigned long value,
const struct tomoyo_number_union *ptr)
{
if (ptr->is_group)
return tomoyo_number_matches_group(value, value, ptr->group);
return value >= ptr->values[0] && value <= ptr->values[1];
}
/**
* tomoyo_path2keyword - Get the name of single path operation.
*
* @operation: Type of operation.
*
* Returns the name of single path operation.
*/
const char *tomoyo_path2keyword(const u8 operation)
{
return (operation < TOMOYO_MAX_PATH_OPERATION)
? tomoyo_path_keyword[operation] : NULL;
}
/**
* tomoyo_path_number32keyword - Get the name of path/number/number/number operations.
*
* @operation: Type of operation.
*
* Returns the name of path/number/number/number operation.
*/
const char *tomoyo_path_number32keyword(const u8 operation)
{
return (operation < TOMOYO_MAX_PATH_NUMBER3_OPERATION)
? tomoyo_path_number3_keyword[operation] : NULL;
}
/**
* tomoyo_path22keyword - Get the name of double path operation.
*
* @operation: Type of operation.
*
* Returns the name of double path operation.
*/
const char *tomoyo_path22keyword(const u8 operation)
{
return (operation < TOMOYO_MAX_PATH2_OPERATION)
? tomoyo_path2_keyword[operation] : NULL;
}
/**
* tomoyo_path_number2keyword - Get the name of path/number operations.
*
* @operation: Type of operation.
*
* Returns the name of path/number operation.
*/
const char *tomoyo_path_number2keyword(const u8 operation)
{
return (operation < TOMOYO_MAX_PATH_NUMBER_OPERATION)
? tomoyo_path_number_keyword[operation] : NULL;
}
static void tomoyo_add_slash(struct tomoyo_path_info *buf)
{
if (buf->is_dir)
return;
/*
* This is OK because tomoyo_encode() reserves space for appending "/".
*/
strcat((char *) buf->name, "/");
tomoyo_fill_path_info(buf);
}
/**
* tomoyo_strendswith - Check whether the token ends with the given token.
*
* @name: The token to check.
* @tail: The token to find.
*
* Returns true if @name ends with @tail, false otherwise.
*/
static bool tomoyo_strendswith(const char *name, const char *tail)
{
int len;
if (!name || !tail)
return false;
len = strlen(name) - strlen(tail);
return len >= 0 && !strcmp(name + len, tail);
}
/**
* tomoyo_get_realpath - Get realpath.
*
* @buf: Pointer to "struct tomoyo_path_info".
* @path: Pointer to "struct path".
*
* Returns true on success, false otherwise.
*/
static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, struct path *path)
{
buf->name = tomoyo_realpath_from_path(path);
if (buf->name) {
tomoyo_fill_path_info(buf);
return true;
}
return false;
}
static int tomoyo_update_path2_acl(const u8 type, const char *filename1,
const char *filename2,
struct tomoyo_domain_info *const domain,
const bool is_delete);
static int tomoyo_update_path_acl(const u8 type, const char *filename,
struct tomoyo_domain_info *const domain,
const bool is_delete);
/*
* tomoyo_globally_readable_list is used for holding list of pathnames which
* are by default allowed to be open()ed for reading by any process.
*
* An entry is added by
*
* # echo 'allow_read /lib/libc-2.5.so' > \
* /sys/kernel/security/tomoyo/exception_policy
*
* and is deleted by
*
* # echo 'delete allow_read /lib/libc-2.5.so' > \
* /sys/kernel/security/tomoyo/exception_policy
*
* and all entries are retrieved by
*
* # grep ^allow_read /sys/kernel/security/tomoyo/exception_policy
*
* In the example above, any process is allowed to
* open("/lib/libc-2.5.so", O_RDONLY).
* One exception is, if the domain which current process belongs to is marked
* as "ignore_global_allow_read", current process can't do so unless explicitly
* given "allow_read /lib/libc-2.5.so" to the domain which current process
* belongs to.
*/
LIST_HEAD(tomoyo_globally_readable_list);
/**
* tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list.
*
* @filename: Filename unconditionally permitted to open() for reading.
* @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_globally_readable_entry(const char *filename,
const bool is_delete)
{
struct tomoyo_globally_readable_file_entry *ptr;
struct tomoyo_globally_readable_file_entry e = { };
int error = is_delete ? -ENOENT : -ENOMEM;
if (!tomoyo_is_correct_word(filename))
return -EINVAL;
e.filename = tomoyo_get_name(filename);
if (!e.filename)
return -ENOMEM;
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) {
if (ptr->filename != e.filename)
continue;
ptr->is_deleted = is_delete;
error = 0;
break;
}
if (!is_delete && error) {
struct tomoyo_globally_readable_file_entry *entry =
tomoyo_commit_ok(&e, sizeof(e));
if (entry) {
list_add_tail_rcu(&entry->list,
&tomoyo_globally_readable_list);
error = 0;
}
}
mutex_unlock(&tomoyo_policy_lock);
out:
tomoyo_put_name(e.filename);
return error;
}
/**
* tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading.
*
* @filename: The filename to check.
*
* Returns true if any domain can open @filename for reading, false otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info *
filename)
{
struct tomoyo_globally_readable_file_entry *ptr;
bool found = false;
list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) {
if (!ptr->is_deleted &&
tomoyo_path_matches_pattern(filename, ptr->filename)) {
found = true;
break;
}
}
return found;
}
/**
* tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list.
*
* @data: String to parse.
* @is_delete: True if it is a delete request.
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
int tomoyo_write_globally_readable_policy(char *data, const bool is_delete)
{
return tomoyo_update_globally_readable_entry(data, is_delete);
}
/**
* tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Returns true on success, false otherwise.
*
* Caller holds tomoyo_read_lock().
*/
bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head)
{
struct list_head *pos;
bool done = true;
list_for_each_cookie(pos, head->read_var2,
&tomoyo_globally_readable_list) {
struct tomoyo_globally_readable_file_entry *ptr;
ptr = list_entry(pos,
struct tomoyo_globally_readable_file_entry,
list);
if (ptr->is_deleted)
continue;
done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n",
ptr->filename->name);
if (!done)
break;
}
return done;
}
/* tomoyo_pattern_list is used for holding list of pathnames which are used for
* converting pathnames to pathname patterns during learning mode.
*
* An entry is added by
*
* # echo 'file_pattern /proc/\$/mounts' > \
* /sys/kernel/security/tomoyo/exception_policy
*
* and is deleted by
*
* # echo 'delete file_pattern /proc/\$/mounts' > \
* /sys/kernel/security/tomoyo/exception_policy
*
* and all entries are retrieved by
*
* # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy
*
* In the example above, if a process which belongs to a domain which is in
* learning mode requested open("/proc/1/mounts", O_RDONLY),
* "allow_read /proc/\$/mounts" is automatically added to the domain which that
* process belongs to.
*
* It is not a desirable behavior that we have to use /proc/\$/ instead of
* /proc/self/ when current process needs to access only current process's
* information. As of now, LSM version of TOMOYO is using __d_path() for
* calculating pathname. Non LSM version of TOMOYO is using its own function
* which pretends as if /proc/self/ is not a symlink; so that we can forbid
* current process from accessing other process's information.
*/
LIST_HEAD(tomoyo_pattern_list);
/**
* tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list.
*
* @pattern: Pathname pattern.
* @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_file_pattern_entry(const char *pattern,
const bool is_delete)
{
struct tomoyo_pattern_entry *ptr;
struct tomoyo_pattern_entry e = { };
int error = is_delete ? -ENOENT : -ENOMEM;
if (!tomoyo_is_correct_word(pattern))
return -EINVAL;
e.pattern = tomoyo_get_name(pattern);
if (!e.pattern)
return error;
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) {
if (e.pattern != ptr->pattern)
continue;
ptr->is_deleted = is_delete;
error = 0;
break;
}
if (!is_delete && error) {
struct tomoyo_pattern_entry *entry =
tomoyo_commit_ok(&e, sizeof(e));
if (entry) {
list_add_tail_rcu(&entry->list, &tomoyo_pattern_list);
error = 0;
}
}
mutex_unlock(&tomoyo_policy_lock);
out:
tomoyo_put_name(e.pattern);
return error;
}
/**
* tomoyo_file_pattern - Get patterned pathname.
*
* @filename: The filename to find patterned pathname.
*
* Returns pointer to pathname pattern if matched, @filename otherwise.
*
* Caller holds tomoyo_read_lock().
*/
const char *tomoyo_file_pattern(const struct tomoyo_path_info *filename)
{
struct tomoyo_pattern_entry *ptr;
const struct tomoyo_path_info *pattern = NULL;
list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) {
if (ptr->is_deleted)
continue;
if (!tomoyo_path_matches_pattern(filename, ptr->pattern))
continue;
pattern = ptr->pattern;
if (tomoyo_strendswith(pattern->name, "/\\*")) {
/* Do nothing. Try to find the better match. */
} else {
/* This would be the better match. Use this. */
break;
}
}
if (pattern)
filename = pattern;
return filename->name;
}
/**
* tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list.
*
* @data: String to parse.
* @is_delete: True if it is a delete request.
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
int tomoyo_write_pattern_policy(char *data, const bool is_delete)
{
return tomoyo_update_file_pattern_entry(data, is_delete);
}
/**
* tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Returns true on success, false otherwise.
*
* Caller holds tomoyo_read_lock().
*/
bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head)
{
struct list_head *pos;
bool done = true;
list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) {
struct tomoyo_pattern_entry *ptr;
ptr = list_entry(pos, struct tomoyo_pattern_entry, list);
if (ptr->is_deleted)
continue;
done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN
"%s\n", ptr->pattern->name);
if (!done)
break;
}
return done;
}
/*
* tomoyo_no_rewrite_list is used for holding list of pathnames which are by
* default forbidden to modify already written content of a file.
*
* An entry is added by
*
* # echo 'deny_rewrite /var/log/messages' > \
* /sys/kernel/security/tomoyo/exception_policy
*
* and is deleted by
*
* # echo 'delete deny_rewrite /var/log/messages' > \
* /sys/kernel/security/tomoyo/exception_policy
*
* and all entries are retrieved by
*
* # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy
*
* In the example above, if a process requested to rewrite /var/log/messages ,
* the process can't rewrite unless the domain which that process belongs to
* has "allow_rewrite /var/log/messages" entry.
*
* It is not a desirable behavior that we have to add "\040(deleted)" suffix
* when we want to allow rewriting already unlink()ed file. As of now,
* LSM version of TOMOYO is using __d_path() for calculating pathname.
* Non LSM version of TOMOYO is using its own function which doesn't append
* " (deleted)" suffix if the file is already unlink()ed; so that we don't
* need to worry whether the file is already unlink()ed or not.
*/
LIST_HEAD(tomoyo_no_rewrite_list);
/**
* tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list.
*
* @pattern: Pathname pattern that are not rewritable by default.
* @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_no_rewrite_entry(const char *pattern,
const bool is_delete)
{
struct tomoyo_no_rewrite_entry *ptr;
struct tomoyo_no_rewrite_entry e = { };
int error = is_delete ? -ENOENT : -ENOMEM;
if (!tomoyo_is_correct_word(pattern))
return -EINVAL;
e.pattern = tomoyo_get_name(pattern);
if (!e.pattern)
return error;
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) {
if (ptr->pattern != e.pattern)
continue;
ptr->is_deleted = is_delete;
error = 0;
break;
}
if (!is_delete && error) {
struct tomoyo_no_rewrite_entry *entry =
tomoyo_commit_ok(&e, sizeof(e));
if (entry) {
list_add_tail_rcu(&entry->list,
&tomoyo_no_rewrite_list);
error = 0;
}
}
mutex_unlock(&tomoyo_policy_lock);
out:
tomoyo_put_name(e.pattern);
return error;
}
/**
* tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited.
*
* @filename: Filename to check.
*
* Returns true if @filename is specified by "deny_rewrite" directive,
* false otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename)
{
struct tomoyo_no_rewrite_entry *ptr;
bool found = false;
list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) {
if (ptr->is_deleted)
continue;
if (!tomoyo_path_matches_pattern(filename, ptr->pattern))
continue;
found = true;
break;
}
return found;
}
/**
* tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list.
*
* @data: String to parse.
* @is_delete: True if it is a delete request.
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete)
{
return tomoyo_update_no_rewrite_entry(data, is_delete);
}
/**
* tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Returns true on success, false otherwise.
*
* Caller holds tomoyo_read_lock().
*/
bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head)
{
struct list_head *pos;
bool done = true;
list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) {
struct tomoyo_no_rewrite_entry *ptr;
ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list);
if (ptr->is_deleted)
continue;
done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE
"%s\n", ptr->pattern->name);
if (!done)
break;
}
return done;
}
/**
* tomoyo_update_file_acl - Update file's read/write/execute ACL.
*
* @perm: Permission (between 1 to 7).
* @filename: Filename.
* @domain: Pointer to "struct tomoyo_domain_info".
* @is_delete: True if it is a delete request.
*
* Returns 0 on success, negative value otherwise.
*
* This is legacy support interface for older policy syntax.
* Current policy syntax uses "allow_read/write" instead of "6",
* "allow_read" instead of "4", "allow_write" instead of "2",
* "allow_execute" instead of "1".
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_update_file_acl(u8 perm, const char *filename,
struct tomoyo_domain_info * const domain,
const bool is_delete)
{
if (perm > 7 || !perm) {
printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n",
__func__, perm, filename);
return -EINVAL;
}
if (filename[0] != '@' && tomoyo_strendswith(filename, "/"))
/*
* Only 'allow_mkdir' and 'allow_rmdir' are valid for
* directory permissions.
*/
return 0;
if (perm & 4)
tomoyo_update_path_acl(TOMOYO_TYPE_READ, filename, domain,
is_delete);
if (perm & 2)
tomoyo_update_path_acl(TOMOYO_TYPE_WRITE, filename, domain,
is_delete);
if (perm & 1)
tomoyo_update_path_acl(TOMOYO_TYPE_EXECUTE, filename, domain,
is_delete);
return 0;
}
/**
* tomoyo_path_acl - Check permission for single path operation.
*
* @r: Pointer to "struct tomoyo_request_info".
* @filename: Filename to check.
* @perm: Permission.
*
* Returns 0 on success, -EPERM otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_path_acl(const struct tomoyo_request_info *r,
const struct tomoyo_path_info *filename,
const u32 perm)
{
struct tomoyo_domain_info *domain = r->domain;
struct tomoyo_acl_info *ptr;
int error = -EPERM;
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
struct tomoyo_path_acl *acl;
if (ptr->type != TOMOYO_TYPE_PATH_ACL)
continue;
acl = container_of(ptr, struct tomoyo_path_acl, head);
if (!(acl->perm & perm) ||
!tomoyo_compare_name_union(filename, &acl->name))
continue;
error = 0;
break;
}
return error;
}
/**
* tomoyo_file_perm - Check permission for opening files.
*
* @r: Pointer to "struct tomoyo_request_info".
* @filename: Filename to check.
* @mode: Mode ("read" or "write" or "read/write" or "execute").
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_file_perm(struct tomoyo_request_info *r,
const struct tomoyo_path_info *filename,
const u8 mode)
{
const char *msg = "<unknown>";
int error = 0;
u32 perm = 0;
if (!filename)
return 0;
if (mode == 6) {
msg = tomoyo_path2keyword(TOMOYO_TYPE_READ_WRITE);
perm = 1 << TOMOYO_TYPE_READ_WRITE;
} else if (mode == 4) {
msg = tomoyo_path2keyword(TOMOYO_TYPE_READ);
perm = 1 << TOMOYO_TYPE_READ;
} else if (mode == 2) {
msg = tomoyo_path2keyword(TOMOYO_TYPE_WRITE);
perm = 1 << TOMOYO_TYPE_WRITE;
} else if (mode == 1) {
msg = tomoyo_path2keyword(TOMOYO_TYPE_EXECUTE);
perm = 1 << TOMOYO_TYPE_EXECUTE;
} else
BUG();
do {
error = tomoyo_path_acl(r, filename, perm);
if (error && mode == 4 && !r->domain->ignore_global_allow_read
&& tomoyo_is_globally_readable_file(filename))
error = 0;
if (!error)
break;
tomoyo_warn_log(r, "%s %s", msg, filename->name);
error = tomoyo_supervisor(r, "allow_%s %s\n", msg,
tomoyo_file_pattern(filename));
/*
* Do not retry for execute request, for alias may have
* changed.
*/
} while (error == TOMOYO_RETRY_REQUEST && mode != 1);
if (r->mode != TOMOYO_CONFIG_ENFORCING)
error = 0;
return error;
}
/**
* tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list.
*
* @type: Type of operation.
* @filename: Filename.
* @domain: Pointer to "struct tomoyo_domain_info".
* @is_delete: True if it is a delete request.
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_update_path_acl(const u8 type, const char *filename,
struct tomoyo_domain_info *const domain,
const bool is_delete)
{
static const u16 tomoyo_rw_mask =
(1 << TOMOYO_TYPE_READ) | (1 << TOMOYO_TYPE_WRITE);
const u16 perm = 1 << type;
struct tomoyo_acl_info *ptr;
struct tomoyo_path_acl e = {
.head.type = TOMOYO_TYPE_PATH_ACL,
.perm = perm
};
int error = is_delete ? -ENOENT : -ENOMEM;
if (type == TOMOYO_TYPE_READ_WRITE)
e.perm |= tomoyo_rw_mask;
if (!domain)
return -EINVAL;
if (!tomoyo_parse_name_union(filename, &e.name))
return -EINVAL;
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
struct tomoyo_path_acl *acl =
container_of(ptr, struct tomoyo_path_acl, head);
if (!tomoyo_is_same_path_acl(acl, &e))
continue;
if (is_delete) {
acl->perm &= ~perm;
if ((acl->perm & tomoyo_rw_mask) != tomoyo_rw_mask)
acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE);
else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE)))
acl->perm &= ~tomoyo_rw_mask;
} else {
acl->perm |= perm;
if ((acl->perm & tomoyo_rw_mask) == tomoyo_rw_mask)
acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE;
else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE))
acl->perm |= tomoyo_rw_mask;
}
error = 0;
break;
}
if (!is_delete && error) {
struct tomoyo_path_acl *entry =
tomoyo_commit_ok(&e, sizeof(e));
if (entry) {
list_add_tail_rcu(&entry->head.list,
&domain->acl_info_list);
error = 0;
}
}
mutex_unlock(&tomoyo_policy_lock);
out:
tomoyo_put_name_union(&e.name);
return error;
}
/**
* tomoyo_update_path_number3_acl - Update "struct tomoyo_path_number3_acl" list.
*
* @type: Type of operation.
* @filename: Filename.
* @mode: Create mode.
* @major: Device major number.
* @minor: Device minor number.
* @domain: Pointer to "struct tomoyo_domain_info".
* @is_delete: True if it is a delete request.
*
* Returns 0 on success, negative value otherwise.
*/
static inline int tomoyo_update_path_number3_acl(const u8 type,
const char *filename,
char *mode,
char *major, char *minor,
struct tomoyo_domain_info *
const domain,
const bool is_delete)
{
const u8 perm = 1 << type;
struct tomoyo_acl_info *ptr;
struct tomoyo_path_number3_acl e = {
.head.type = TOMOYO_TYPE_PATH_NUMBER3_ACL,
.perm = perm
};
int error = is_delete ? -ENOENT : -ENOMEM;
if (!tomoyo_parse_name_union(filename, &e.name) ||
!tomoyo_parse_number_union(mode, &e.mode) ||
!tomoyo_parse_number_union(major, &e.major) ||
!tomoyo_parse_number_union(minor, &e.minor))
goto out;
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
struct tomoyo_path_number3_acl *acl =
container_of(ptr, struct tomoyo_path_number3_acl, head);
if (!tomoyo_is_same_path_number3_acl(acl, &e))
continue;
if (is_delete)
acl->perm &= ~perm;
else
acl->perm |= perm;
error = 0;
break;
}
if (!is_delete && error) {
struct tomoyo_path_number3_acl *entry =
tomoyo_commit_ok(&e, sizeof(e));
if (entry) {
list_add_tail_rcu(&entry->head.list,
&domain->acl_info_list);
error = 0;
}
}
mutex_unlock(&tomoyo_policy_lock);
out:
tomoyo_put_name_union(&e.name);
tomoyo_put_number_union(&e.mode);
tomoyo_put_number_union(&e.major);
tomoyo_put_number_union(&e.minor);
return error;
}
/**
* tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list.
*
* @type: Type of operation.
* @filename1: First filename.
* @filename2: Second filename.
* @domain: Pointer to "struct tomoyo_domain_info".
* @is_delete: True if it is a delete request.
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_update_path2_acl(const u8 type, const char *filename1,
const char *filename2,
struct tomoyo_domain_info *const domain,
const bool is_delete)
{
const u8 perm = 1 << type;
struct tomoyo_path2_acl e = {
.head.type = TOMOYO_TYPE_PATH2_ACL,
.perm = perm
};
struct tomoyo_acl_info *ptr;
int error = is_delete ? -ENOENT : -ENOMEM;
if (!domain)
return -EINVAL;
if (!tomoyo_parse_name_union(filename1, &e.name1) ||
!tomoyo_parse_name_union(filename2, &e.name2))
goto out;
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
struct tomoyo_path2_acl *acl =
container_of(ptr, struct tomoyo_path2_acl, head);
if (!tomoyo_is_same_path2_acl(acl, &e))
continue;
if (is_delete)
acl->perm &= ~perm;
else
acl->perm |= perm;
error = 0;
break;
}
if (!is_delete && error) {
struct tomoyo_path2_acl *entry =
tomoyo_commit_ok(&e, sizeof(e));
if (entry) {
list_add_tail_rcu(&entry->head.list,
&domain->acl_info_list);
error = 0;
}
}
mutex_unlock(&tomoyo_policy_lock);
out:
tomoyo_put_name_union(&e.name1);
tomoyo_put_name_union(&e.name2);
return error;
}
/**
* tomoyo_path_number3_acl - Check permission for path/number/number/number operation.
*
* @r: Pointer to "struct tomoyo_request_info".
* @filename: Filename to check.
* @perm: Permission.
* @mode: Create mode.
* @major: Device major number.
* @minor: Device minor number.
*
* Returns 0 on success, -EPERM otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_path_number3_acl(struct tomoyo_request_info *r,
const struct tomoyo_path_info *filename,
const u16 perm, const unsigned int mode,
const unsigned int major,
const unsigned int minor)
{
struct tomoyo_domain_info *domain = r->domain;
struct tomoyo_acl_info *ptr;
int error = -EPERM;
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
struct tomoyo_path_number3_acl *acl;
if (ptr->type != TOMOYO_TYPE_PATH_NUMBER3_ACL)
continue;
acl = container_of(ptr, struct tomoyo_path_number3_acl, head);
if (!tomoyo_compare_number_union(mode, &acl->mode))
continue;
if (!tomoyo_compare_number_union(major, &acl->major))
continue;
if (!tomoyo_compare_number_union(minor, &acl->minor))
continue;
if (!(acl->perm & perm))
continue;
if (!tomoyo_compare_name_union(filename, &acl->name))
continue;
error = 0;
break;
}
return error;
}
/**
* tomoyo_path2_acl - Check permission for double path operation.
*
* @r: Pointer to "struct tomoyo_request_info".
* @type: Type of operation.
* @filename1: First filename to check.
* @filename2: Second filename to check.
*
* Returns 0 on success, -EPERM otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_path2_acl(const struct tomoyo_request_info *r, const u8 type,
const struct tomoyo_path_info *filename1,
const struct tomoyo_path_info *filename2)
{
const struct tomoyo_domain_info *domain = r->domain;
struct tomoyo_acl_info *ptr;
const u8 perm = 1 << type;
int error = -EPERM;
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
struct tomoyo_path2_acl *acl;
if (ptr->type != TOMOYO_TYPE_PATH2_ACL)
continue;
acl = container_of(ptr, struct tomoyo_path2_acl, head);
if (!(acl->perm & perm))
continue;
if (!tomoyo_compare_name_union(filename1, &acl->name1))
continue;
if (!tomoyo_compare_name_union(filename2, &acl->name2))
continue;
error = 0;
break;
}
return error;
}
/**
* tomoyo_path_permission - Check permission for single path operation.
*
* @r: Pointer to "struct tomoyo_request_info".
* @operation: Type of operation.
* @filename: Filename to check.
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
const struct tomoyo_path_info *filename)
{
const char *msg;
int error;
next:
r->type = tomoyo_p2mac[operation];
r->mode = tomoyo_get_mode(r->profile, r->type);
if (r->mode == TOMOYO_CONFIG_DISABLED)
return 0;
do {
error = tomoyo_path_acl(r, filename, 1 << operation);
if (!error)
break;
msg = tomoyo_path2keyword(operation);
tomoyo_warn_log(r, "%s %s", msg, filename->name);
error = tomoyo_supervisor(r, "allow_%s %s\n", msg,
tomoyo_file_pattern(filename));
} while (error == TOMOYO_RETRY_REQUEST);
if (r->mode != TOMOYO_CONFIG_ENFORCING)
error = 0;
/*
* Since "allow_truncate" doesn't imply "allow_rewrite" permission,
* we need to check "allow_rewrite" permission if the filename is
* specified by "deny_rewrite" keyword.
*/
if (!error && operation == TOMOYO_TYPE_TRUNCATE &&
tomoyo_is_no_rewrite_file(filename)) {
operation = TOMOYO_TYPE_REWRITE;
goto next;
}
return error;
}
/**
* tomoyo_path_number_acl - Check permission for ioctl/chmod/chown/chgrp operation.
*
* @r: Pointer to "struct tomoyo_request_info".
* @type: Operation.
* @filename: Filename to check.
* @number: Number.
*
* Returns 0 on success, -EPERM otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_path_number_acl(struct tomoyo_request_info *r, const u8 type,
const struct tomoyo_path_info *filename,
const unsigned long number)
{
struct tomoyo_domain_info *domain = r->domain;
struct tomoyo_acl_info *ptr;
const u8 perm = 1 << type;
int error = -EPERM;
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
struct tomoyo_path_number_acl *acl;
if (ptr->type != TOMOYO_TYPE_PATH_NUMBER_ACL)
continue;
acl = container_of(ptr, struct tomoyo_path_number_acl,
head);
if (!(acl->perm & perm) ||
!tomoyo_compare_number_union(number, &acl->number) ||
!tomoyo_compare_name_union(filename, &acl->name))
continue;
error = 0;
break;
}
return error;
}
/**
* tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL.
*
* @type: Type of operation.
* @filename: Filename.
* @number: Number.
* @domain: Pointer to "struct tomoyo_domain_info".
* @is_delete: True if it is a delete request.
*
* Returns 0 on success, negative value otherwise.
*/
static inline int tomoyo_update_path_number_acl(const u8 type,
const char *filename,
char *number,
struct tomoyo_domain_info *
const domain,
const bool is_delete)
{
const u8 perm = 1 << type;
struct tomoyo_acl_info *ptr;
struct tomoyo_path_number_acl e = {
.head.type = TOMOYO_TYPE_PATH_NUMBER_ACL,
.perm = perm
};
int error = is_delete ? -ENOENT : -ENOMEM;
if (!domain)
return -EINVAL;
if (!tomoyo_parse_name_union(filename, &e.name))
return -EINVAL;
if (!tomoyo_parse_number_union(number, &e.number))
goto out;
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
struct tomoyo_path_number_acl *acl =
container_of(ptr, struct tomoyo_path_number_acl, head);
if (!tomoyo_is_same_path_number_acl(acl, &e))
continue;
if (is_delete)
acl->perm &= ~perm;
else
acl->perm |= perm;
error = 0;
break;
}
if (!is_delete && error) {
struct tomoyo_path_number_acl *entry =
tomoyo_commit_ok(&e, sizeof(e));
if (entry) {
list_add_tail_rcu(&entry->head.list,
&domain->acl_info_list);
error = 0;
}
}
mutex_unlock(&tomoyo_policy_lock);
out:
tomoyo_put_name_union(&e.name);
tomoyo_put_number_union(&e.number);
return error;
}
/**
* tomoyo_path_number_perm2 - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp".
*
* @r: Pointer to "strct tomoyo_request_info".
* @filename: Filename to check.
* @number: Number.
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_path_number_perm2(struct tomoyo_request_info *r,
const u8 type,
const struct tomoyo_path_info *filename,
const unsigned long number)
{
char buffer[64];
int error;
u8 radix;
const char *msg;
if (!filename)
return 0;
switch (type) {
case TOMOYO_TYPE_CREATE:
case TOMOYO_TYPE_MKDIR:
case TOMOYO_TYPE_MKFIFO:
case TOMOYO_TYPE_MKSOCK:
case TOMOYO_TYPE_CHMOD:
radix = TOMOYO_VALUE_TYPE_OCTAL;
break;
case TOMOYO_TYPE_IOCTL:
radix = TOMOYO_VALUE_TYPE_HEXADECIMAL;
break;
default:
radix = TOMOYO_VALUE_TYPE_DECIMAL;
break;
}
tomoyo_print_ulong(buffer, sizeof(buffer), number, radix);
do {
error = tomoyo_path_number_acl(r, type, filename, number);
if (!error)
break;
msg = tomoyo_path_number2keyword(type);
tomoyo_warn_log(r, "%s %s %s", msg, filename->name, buffer);
error = tomoyo_supervisor(r, "allow_%s %s %s\n", msg,
tomoyo_file_pattern(filename),
buffer);
} while (error == TOMOYO_RETRY_REQUEST);
if (r->mode != TOMOYO_CONFIG_ENFORCING)
error = 0;
return error;
}
/**
* tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp".
*
* @type: Type of operation.
* @path: Pointer to "struct path".
* @number: Number.
*
* Returns 0 on success, negative value otherwise.
*/
int tomoyo_path_number_perm(const u8 type, struct path *path,
unsigned long number)
{
struct tomoyo_request_info r;
int error = -ENOMEM;
struct tomoyo_path_info buf;
int idx;
if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type])
== TOMOYO_CONFIG_DISABLED || !path->mnt || !path->dentry)
return 0;
idx = tomoyo_read_lock();
if (!tomoyo_get_realpath(&buf, path))
goto out;
if (type == TOMOYO_TYPE_MKDIR)
tomoyo_add_slash(&buf);
error = tomoyo_path_number_perm2(&r, type, &buf, number);
out:
kfree(buf.name);
tomoyo_read_unlock(idx);
if (r.mode != TOMOYO_CONFIG_ENFORCING)
error = 0;
return error;
}
/**
* tomoyo_check_exec_perm - Check permission for "execute".
*
* @r: Pointer to "struct tomoyo_request_info".
* @filename: Check permission for "execute".
*
* Returns 0 on success, negativevalue otherwise.
*
* Caller holds tomoyo_read_lock().
*/
int tomoyo_check_exec_perm(struct tomoyo_request_info *r,
const struct tomoyo_path_info *filename)
{
if (r->mode == TOMOYO_CONFIG_DISABLED)
return 0;
return tomoyo_file_perm(r, filename, 1);
}
/**
* tomoyo_check_open_permission - Check permission for "read" and "write".
*
* @domain: Pointer to "struct tomoyo_domain_info".
* @path: Pointer to "struct path".
* @flag: Flags for open().
*
* Returns 0 on success, negative value otherwise.
*/
int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
struct path *path, const int flag)
{
const u8 acc_mode = ACC_MODE(flag);
int error = -ENOMEM;
struct tomoyo_path_info buf;
struct tomoyo_request_info r;
int idx;
if (!path->mnt ||
(path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)))
return 0;
buf.name = NULL;
r.mode = TOMOYO_CONFIG_DISABLED;
idx = tomoyo_read_lock();
if (!tomoyo_get_realpath(&buf, path))
goto out;
error = 0;
/*
* If the filename is specified by "deny_rewrite" keyword,
* we need to check "allow_rewrite" permission when the filename is not
* opened for append mode or the filename is truncated at open time.
*/
if ((acc_mode & MAY_WRITE) && !(flag & O_APPEND)
&& tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_REWRITE)
!= TOMOYO_CONFIG_DISABLED) {
if (!tomoyo_get_realpath(&buf, path)) {
error = -ENOMEM;
goto out;
}
if (tomoyo_is_no_rewrite_file(&buf))
error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE,
&buf);
}
if (!error && acc_mode &&
tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN)
!= TOMOYO_CONFIG_DISABLED) {
if (!buf.name && !tomoyo_get_realpath(&buf, path)) {
error = -ENOMEM;
goto out;
}
error = tomoyo_file_perm(&r, &buf, acc_mode);
}
out:
kfree(buf.name);
tomoyo_read_unlock(idx);
if (r.mode != TOMOYO_CONFIG_ENFORCING)
error = 0;
return error;
}
/**
* tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "rewrite", "chroot" and "unmount".
*
* @operation: Type of operation.
* @path: Pointer to "struct path".
*
* Returns 0 on success, negative value otherwise.
*/
int tomoyo_path_perm(const u8 operation, struct path *path)
{
int error = -ENOMEM;
struct tomoyo_path_info buf;
struct tomoyo_request_info r;
int idx;
if (!path->mnt)
return 0;
if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation])
== TOMOYO_CONFIG_DISABLED)
return 0;
buf.name = NULL;
idx = tomoyo_read_lock();
if (!tomoyo_get_realpath(&buf, path))
goto out;
switch (operation) {
case TOMOYO_TYPE_REWRITE:
if (!tomoyo_is_no_rewrite_file(&buf)) {
error = 0;
goto out;
}
break;
case TOMOYO_TYPE_RMDIR:
case TOMOYO_TYPE_CHROOT:
case TOMOYO_TYPE_UMOUNT:
tomoyo_add_slash(&buf);
break;
}
error = tomoyo_path_permission(&r, operation, &buf);
out:
kfree(buf.name);
tomoyo_read_unlock(idx);
if (r.mode != TOMOYO_CONFIG_ENFORCING)
error = 0;
return error;
}
/**
* tomoyo_path_number3_perm2 - Check permission for path/number/number/number operation.
*
* @r: Pointer to "struct tomoyo_request_info".
* @operation: Type of operation.
* @filename: Filename to check.
* @mode: Create mode.
* @dev: Device number.
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_path_number3_perm2(struct tomoyo_request_info *r,
const u8 operation,
const struct tomoyo_path_info *filename,
const unsigned int mode,
const unsigned int dev)
{
int error;
const char *msg;
const unsigned int major = MAJOR(dev);
const unsigned int minor = MINOR(dev);
do {
error = tomoyo_path_number3_acl(r, filename, 1 << operation,
mode, major, minor);
if (!error)
break;
msg = tomoyo_path_number32keyword(operation);
tomoyo_warn_log(r, "%s %s 0%o %u %u", msg, filename->name,
mode, major, minor);
error = tomoyo_supervisor(r, "allow_%s %s 0%o %u %u\n", msg,
tomoyo_file_pattern(filename), mode,
major, minor);
} while (error == TOMOYO_RETRY_REQUEST);
if (r->mode != TOMOYO_CONFIG_ENFORCING)
error = 0;
return error;
}
/**
* tomoyo_path_number3_perm - Check permission for "mkblock" and "mkchar".
*
* @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK)
* @path: Pointer to "struct path".
* @mode: Create mode.
* @dev: Device number.
*
* Returns 0 on success, negative value otherwise.
*/
int tomoyo_path_number3_perm(const u8 operation, struct path *path,
const unsigned int mode, unsigned int dev)
{
struct tomoyo_request_info r;
int error = -ENOMEM;
struct tomoyo_path_info buf;
int idx;
if (!path->mnt ||
tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation])
== TOMOYO_CONFIG_DISABLED)
return 0;
idx = tomoyo_read_lock();
error = -ENOMEM;
if (tomoyo_get_realpath(&buf, path)) {
error = tomoyo_path_number3_perm2(&r, operation, &buf, mode,
new_decode_dev(dev));
kfree(buf.name);
}
tomoyo_read_unlock(idx);
if (r.mode != TOMOYO_CONFIG_ENFORCING)
error = 0;
return error;
}
/**
* tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root".
*
* @operation: Type of operation.
* @path1: Pointer to "struct path".
* @path2: Pointer to "struct path".
*
* Returns 0 on success, negative value otherwise.
*/
int tomoyo_path2_perm(const u8 operation, struct path *path1,
struct path *path2)
{
int error = -ENOMEM;
const char *msg;
struct tomoyo_path_info buf1;
struct tomoyo_path_info buf2;
struct tomoyo_request_info r;
int idx;
if (!path1->mnt || !path2->mnt ||
tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation])
== TOMOYO_CONFIG_DISABLED)
return 0;
buf1.name = NULL;
buf2.name = NULL;
idx = tomoyo_read_lock();
if (!tomoyo_get_realpath(&buf1, path1) ||
!tomoyo_get_realpath(&buf2, path2))
goto out;
switch (operation) {
struct dentry *dentry;
case TOMOYO_TYPE_RENAME:
case TOMOYO_TYPE_LINK:
dentry = path1->dentry;
if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode))
break;
/* fall through */
case TOMOYO_TYPE_PIVOT_ROOT:
tomoyo_add_slash(&buf1);
tomoyo_add_slash(&buf2);
break;
}
do {
error = tomoyo_path2_acl(&r, operation, &buf1, &buf2);
if (!error)
break;
msg = tomoyo_path22keyword(operation);
tomoyo_warn_log(&r, "%s %s %s", msg, buf1.name, buf2.name);
error = tomoyo_supervisor(&r, "allow_%s %s %s\n", msg,
tomoyo_file_pattern(&buf1),
tomoyo_file_pattern(&buf2));
} while (error == TOMOYO_RETRY_REQUEST);
out:
kfree(buf1.name);
kfree(buf2.name);
tomoyo_read_unlock(idx);
if (r.mode != TOMOYO_CONFIG_ENFORCING)
error = 0;
return error;
}
/**
* tomoyo_write_file_policy - Update file related list.
*
* @data: String to parse.
* @domain: Pointer to "struct tomoyo_domain_info".
* @is_delete: True if it is a delete request.
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain,
const bool is_delete)
{
char *w[5];
u8 type;
if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0])
return -EINVAL;
if (strncmp(w[0], "allow_", 6)) {
unsigned int perm;
if (sscanf(w[0], "%u", &perm) == 1)
return tomoyo_update_file_acl((u8) perm, w[1], domain,
is_delete);
goto out;
}
w[0] += 6;
for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) {
if (strcmp(w[0], tomoyo_path_keyword[type]))
continue;
return tomoyo_update_path_acl(type, w[1], domain, is_delete);
}
if (!w[2][0])
goto out;
for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) {
if (strcmp(w[0], tomoyo_path2_keyword[type]))
continue;
return tomoyo_update_path2_acl(type, w[1], w[2], domain,
is_delete);
}
for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) {
if (strcmp(w[0], tomoyo_path_number_keyword[type]))
continue;
return tomoyo_update_path_number_acl(type, w[1], w[2], domain,
is_delete);
}
if (!w[3][0] || !w[4][0])
goto out;
for (type = 0; type < TOMOYO_MAX_PATH_NUMBER3_OPERATION; type++) {
if (strcmp(w[0], tomoyo_path_number3_keyword[type]))
continue;
return tomoyo_update_path_number3_acl(type, w[1], w[2], w[3],
w[4], domain, is_delete);
}
out:
return -EINVAL;
}
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