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TOMOYO: Allow using owner/group etc. of file objects as conditions. 

This patch adds support for permission checks using file object's DAC
attributes (e.g. owner/group) when checking file's pathnames. Hooks for passing
file object's pointers are in the last patch of this pathset.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Tetsuo Handa 2011-07-08 13:22:41 +09:00 committed by James Morris
parent 2066a36125
commit 8761afd49e
4 changed files with 457 additions and 0 deletions
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72
security/tomoyo/audit.c
View File

@ -9,6 +9,35 @@
#include "common.h"
#include <linux/slab.h>
/**
* tomoyo_filetype - Get string representation of file type.
*
* @mode: Mode value for stat().
*
* Returns file type string.
*/
static inline const char *tomoyo_filetype(const mode_t mode)
{
switch (mode & S_IFMT) {
case S_IFREG:
case 0:
return tomoyo_condition_keyword[TOMOYO_TYPE_IS_FILE];
case S_IFDIR:
return tomoyo_condition_keyword[TOMOYO_TYPE_IS_DIRECTORY];
case S_IFLNK:
return tomoyo_condition_keyword[TOMOYO_TYPE_IS_SYMLINK];
case S_IFIFO:
return tomoyo_condition_keyword[TOMOYO_TYPE_IS_FIFO];
case S_IFSOCK:
return tomoyo_condition_keyword[TOMOYO_TYPE_IS_SOCKET];
case S_IFBLK:
return tomoyo_condition_keyword[TOMOYO_TYPE_IS_BLOCK_DEV];
case S_IFCHR:
return tomoyo_condition_keyword[TOMOYO_TYPE_IS_CHAR_DEV];
}
return "unknown"; /* This should not happen. */
}
/**
* tomoyo_print_header - Get header line of audit log.
*
@ -23,9 +52,11 @@ static char *tomoyo_print_header(struct tomoyo_request_info *r)
{
struct tomoyo_time stamp;
const pid_t gpid = task_pid_nr(current);
struct tomoyo_obj_info *obj = r->obj;
static const int tomoyo_buffer_len = 4096;
char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
int pos;
u8 i;
if (!buffer)
return NULL;
{
@ -44,6 +75,47 @@ static char *tomoyo_print_header(struct tomoyo_request_info *r)
current_uid(), current_gid(), current_euid(),
current_egid(), current_suid(), current_sgid(),
current_fsuid(), current_fsgid());
if (!obj)
goto no_obj_info;
if (!obj->validate_done) {
tomoyo_get_attributes(obj);
obj->validate_done = true;
}
for (i = 0; i < TOMOYO_MAX_PATH_STAT; i++) {
struct tomoyo_mini_stat *stat;
unsigned int dev;
mode_t mode;
if (!obj->stat_valid[i])
continue;
stat = &obj->stat[i];
dev = stat->dev;
mode = stat->mode;
if (i & 1) {
pos += snprintf(buffer + pos,
tomoyo_buffer_len - 1 - pos,
" path%u.parent={ uid=%u gid=%u "
"ino=%lu perm=0%o }", (i >> 1) + 1,
stat->uid, stat->gid, (unsigned long)
stat->ino, stat->mode & S_IALLUGO);
continue;
}
pos += snprintf(buffer + pos, tomoyo_buffer_len - 1 - pos,
" path%u={ uid=%u gid=%u ino=%lu major=%u"
" minor=%u perm=0%o type=%s", (i >> 1) + 1,
stat->uid, stat->gid, (unsigned long)
stat->ino, MAJOR(dev), MINOR(dev),
mode & S_IALLUGO, tomoyo_filetype(mode));
if (S_ISCHR(mode) || S_ISBLK(mode)) {
dev = stat->rdev;
pos += snprintf(buffer + pos,
tomoyo_buffer_len - 1 - pos,
" dev_major=%u dev_minor=%u",
MAJOR(dev), MINOR(dev));
}
pos += snprintf(buffer + pos, tomoyo_buffer_len - 1 - pos,
" }");
}
no_obj_info:
if (pos < tomoyo_buffer_len - 1)
return buffer;
kfree(buffer);

45
security/tomoyo/common.c
View File

@ -60,6 +60,51 @@ const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
[TOMOYO_TASK_FSGID] = "task.fsgid",
[TOMOYO_TASK_PID] = "task.pid",
[TOMOYO_TASK_PPID] = "task.ppid",
[TOMOYO_TYPE_IS_SOCKET] = "socket",
[TOMOYO_TYPE_IS_SYMLINK] = "symlink",
[TOMOYO_TYPE_IS_FILE] = "file",
[TOMOYO_TYPE_IS_BLOCK_DEV] = "block",
[TOMOYO_TYPE_IS_DIRECTORY] = "directory",
[TOMOYO_TYPE_IS_CHAR_DEV] = "char",
[TOMOYO_TYPE_IS_FIFO] = "fifo",
[TOMOYO_MODE_SETUID] = "setuid",
[TOMOYO_MODE_SETGID] = "setgid",
[TOMOYO_MODE_STICKY] = "sticky",
[TOMOYO_MODE_OWNER_READ] = "owner_read",
[TOMOYO_MODE_OWNER_WRITE] = "owner_write",
[TOMOYO_MODE_OWNER_EXECUTE] = "owner_execute",
[TOMOYO_MODE_GROUP_READ] = "group_read",
[TOMOYO_MODE_GROUP_WRITE] = "group_write",
[TOMOYO_MODE_GROUP_EXECUTE] = "group_execute",
[TOMOYO_MODE_OTHERS_READ] = "others_read",
[TOMOYO_MODE_OTHERS_WRITE] = "others_write",
[TOMOYO_MODE_OTHERS_EXECUTE] = "others_execute",
[TOMOYO_PATH1_UID] = "path1.uid",
[TOMOYO_PATH1_GID] = "path1.gid",
[TOMOYO_PATH1_INO] = "path1.ino",
[TOMOYO_PATH1_MAJOR] = "path1.major",
[TOMOYO_PATH1_MINOR] = "path1.minor",
[TOMOYO_PATH1_PERM] = "path1.perm",
[TOMOYO_PATH1_TYPE] = "path1.type",
[TOMOYO_PATH1_DEV_MAJOR] = "path1.dev_major",
[TOMOYO_PATH1_DEV_MINOR] = "path1.dev_minor",
[TOMOYO_PATH2_UID] = "path2.uid",
[TOMOYO_PATH2_GID] = "path2.gid",
[TOMOYO_PATH2_INO] = "path2.ino",
[TOMOYO_PATH2_MAJOR] = "path2.major",
[TOMOYO_PATH2_MINOR] = "path2.minor",
[TOMOYO_PATH2_PERM] = "path2.perm",
[TOMOYO_PATH2_TYPE] = "path2.type",
[TOMOYO_PATH2_DEV_MAJOR] = "path2.dev_major",
[TOMOYO_PATH2_DEV_MINOR] = "path2.dev_minor",
[TOMOYO_PATH1_PARENT_UID] = "path1.parent.uid",
[TOMOYO_PATH1_PARENT_GID] = "path1.parent.gid",
[TOMOYO_PATH1_PARENT_INO] = "path1.parent.ino",
[TOMOYO_PATH1_PARENT_PERM] = "path1.parent.perm",
[TOMOYO_PATH2_PARENT_UID] = "path2.parent.uid",
[TOMOYO_PATH2_PARENT_GID] = "path2.parent.gid",
[TOMOYO_PATH2_PARENT_INO] = "path2.parent.ino",
[TOMOYO_PATH2_PARENT_PERM] = "path2.parent.perm",
};
/* String table for PREFERENCE keyword. */

91
security/tomoyo/common.h
View File

@ -54,10 +54,66 @@ enum tomoyo_conditions_index {
TOMOYO_TASK_FSGID, /* current_fsgid() */
TOMOYO_TASK_PID, /* sys_getpid() */
TOMOYO_TASK_PPID, /* sys_getppid() */
TOMOYO_TYPE_IS_SOCKET, /* S_IFSOCK */
TOMOYO_TYPE_IS_SYMLINK, /* S_IFLNK */
TOMOYO_TYPE_IS_FILE, /* S_IFREG */
TOMOYO_TYPE_IS_BLOCK_DEV, /* S_IFBLK */
TOMOYO_TYPE_IS_DIRECTORY, /* S_IFDIR */
TOMOYO_TYPE_IS_CHAR_DEV, /* S_IFCHR */
TOMOYO_TYPE_IS_FIFO, /* S_IFIFO */
TOMOYO_MODE_SETUID, /* S_ISUID */
TOMOYO_MODE_SETGID, /* S_ISGID */
TOMOYO_MODE_STICKY, /* S_ISVTX */
TOMOYO_MODE_OWNER_READ, /* S_IRUSR */
TOMOYO_MODE_OWNER_WRITE, /* S_IWUSR */
TOMOYO_MODE_OWNER_EXECUTE, /* S_IXUSR */
TOMOYO_MODE_GROUP_READ, /* S_IRGRP */
TOMOYO_MODE_GROUP_WRITE, /* S_IWGRP */
TOMOYO_MODE_GROUP_EXECUTE, /* S_IXGRP */
TOMOYO_MODE_OTHERS_READ, /* S_IROTH */
TOMOYO_MODE_OTHERS_WRITE, /* S_IWOTH */
TOMOYO_MODE_OTHERS_EXECUTE, /* S_IXOTH */
TOMOYO_PATH1_UID,
TOMOYO_PATH1_GID,
TOMOYO_PATH1_INO,
TOMOYO_PATH1_MAJOR,
TOMOYO_PATH1_MINOR,
TOMOYO_PATH1_PERM,
TOMOYO_PATH1_TYPE,
TOMOYO_PATH1_DEV_MAJOR,
TOMOYO_PATH1_DEV_MINOR,
TOMOYO_PATH2_UID,
TOMOYO_PATH2_GID,
TOMOYO_PATH2_INO,
TOMOYO_PATH2_MAJOR,
TOMOYO_PATH2_MINOR,
TOMOYO_PATH2_PERM,
TOMOYO_PATH2_TYPE,
TOMOYO_PATH2_DEV_MAJOR,
TOMOYO_PATH2_DEV_MINOR,
TOMOYO_PATH1_PARENT_UID,
TOMOYO_PATH1_PARENT_GID,
TOMOYO_PATH1_PARENT_INO,
TOMOYO_PATH1_PARENT_PERM,
TOMOYO_PATH2_PARENT_UID,
TOMOYO_PATH2_PARENT_GID,
TOMOYO_PATH2_PARENT_INO,
TOMOYO_PATH2_PARENT_PERM,
TOMOYO_MAX_CONDITION_KEYWORD,
TOMOYO_NUMBER_UNION,
};
/* Index numbers for stat(). */
enum tomoyo_path_stat_index {
/* Do not change this order. */
TOMOYO_PATH1,
TOMOYO_PATH1_PARENT,
TOMOYO_PATH2,
TOMOYO_PATH2_PARENT,
TOMOYO_MAX_PATH_STAT
};
/* Index numbers for operation mode. */
enum tomoyo_mode_index {
TOMOYO_CONFIG_DISABLED,
@ -290,6 +346,11 @@ struct tomoyo_policy_namespace;
/* Structure for request info. */
struct tomoyo_request_info {
/*
* For holding parameters specific to operations which deal files.
* NULL if not dealing files.
*/
struct tomoyo_obj_info *obj;
struct tomoyo_domain_info *domain;
/* For holding parameters. */
union {
@ -388,6 +449,35 @@ struct tomoyo_number_group {
struct tomoyo_number_union number;
};
/* Subset of "struct stat". Used by conditional ACL and audit logs. */
struct tomoyo_mini_stat {
uid_t uid;
gid_t gid;
ino_t ino;
mode_t mode;
dev_t dev;
dev_t rdev;
};
/* Structure for attribute checks in addition to pathname checks. */
struct tomoyo_obj_info {
/*
* True if tomoyo_get_attributes() was already called, false otherwise.
*/
bool validate_done;
/* True if @stat[] is valid. */
bool stat_valid[TOMOYO_MAX_PATH_STAT];
/* First pathname. Initialized with { NULL, NULL } if no path. */
struct path path1;
/* Second pathname. Initialized with { NULL, NULL } if no path. */
struct path path2;
/*
* Information on @path1, @path1's parent directory, @path2, @path2's
* parent directory.
*/
struct tomoyo_mini_stat stat[TOMOYO_MAX_PATH_STAT];
};
/* Structure for entries which follows "struct tomoyo_condition". */
struct tomoyo_condition_element {
/* Left hand operand. */
@ -733,6 +823,7 @@ void tomoyo_check_profile(void);
void tomoyo_convert_time(time_t time, struct tomoyo_time *stamp);
void tomoyo_del_condition(struct list_head *element);
void tomoyo_fill_path_info(struct tomoyo_path_info *ptr);
void tomoyo_get_attributes(struct tomoyo_obj_info *obj);
void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns);
void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
__printf(2, 3);

249
security/tomoyo/condition.c
View File

@ -243,6 +243,54 @@ out:
return NULL;
}
/**
* tomoyo_get_attributes - Revalidate "struct inode".
*
* @obj: Pointer to "struct tomoyo_obj_info".
*
* Returns nothing.
*/
void tomoyo_get_attributes(struct tomoyo_obj_info *obj)
{
u8 i;
struct dentry *dentry = NULL;
for (i = 0; i < TOMOYO_MAX_PATH_STAT; i++) {
struct inode *inode;
switch (i) {
case TOMOYO_PATH1:
dentry = obj->path1.dentry;
if (!dentry)
continue;
break;
case TOMOYO_PATH2:
dentry = obj->path2.dentry;
if (!dentry)
continue;
break;
default:
if (!dentry)
continue;
dentry = dget_parent(dentry);
break;
}
inode = dentry->d_inode;
if (inode) {
struct tomoyo_mini_stat *stat = &obj->stat[i];
stat->uid = inode->i_uid;
stat->gid = inode->i_gid;
stat->ino = inode->i_ino;
stat->mode = inode->i_mode;
stat->dev = inode->i_sb->s_dev;
stat->rdev = inode->i_rdev;
obj->stat_valid[i] = true;
}
if (i & 1) /* i == TOMOYO_PATH1_PARENT ||
i == TOMOYO_PATH2_PARENT */
dput(dentry);
}
}
/**
* tomoyo_condition - Check condition part.
*
@ -261,16 +309,19 @@ bool tomoyo_condition(struct tomoyo_request_info *r,
unsigned long max_v[2] = { 0, 0 };
const struct tomoyo_condition_element *condp;
const struct tomoyo_number_union *numbers_p;
struct tomoyo_obj_info *obj;
u16 condc;
if (!cond)
return true;
condc = cond->condc;
obj = r->obj;
condp = (struct tomoyo_condition_element *) (cond + 1);
numbers_p = (const struct tomoyo_number_union *) (condp + condc);
for (i = 0; i < condc; i++) {
const bool match = condp->equals;
const u8 left = condp->left;
const u8 right = condp->right;
bool is_bitop[2] = { false, false };
u8 j;
condp++;
/* Check numeric or bit-op expressions. */
@ -308,14 +359,185 @@ bool tomoyo_condition(struct tomoyo_request_info *r,
case TOMOYO_TASK_PPID:
value = tomoyo_sys_getppid();
break;
case TOMOYO_TYPE_IS_SOCKET:
value = S_IFSOCK;
break;
case TOMOYO_TYPE_IS_SYMLINK:
value = S_IFLNK;
break;
case TOMOYO_TYPE_IS_FILE:
value = S_IFREG;
break;
case TOMOYO_TYPE_IS_BLOCK_DEV:
value = S_IFBLK;
break;
case TOMOYO_TYPE_IS_DIRECTORY:
value = S_IFDIR;
break;
case TOMOYO_TYPE_IS_CHAR_DEV:
value = S_IFCHR;
break;
case TOMOYO_TYPE_IS_FIFO:
value = S_IFIFO;
break;
case TOMOYO_MODE_SETUID:
value = S_ISUID;
break;
case TOMOYO_MODE_SETGID:
value = S_ISGID;
break;
case TOMOYO_MODE_STICKY:
value = S_ISVTX;
break;
case TOMOYO_MODE_OWNER_READ:
value = S_IRUSR;
break;
case TOMOYO_MODE_OWNER_WRITE:
value = S_IWUSR;
break;
case TOMOYO_MODE_OWNER_EXECUTE:
value = S_IXUSR;
break;
case TOMOYO_MODE_GROUP_READ:
value = S_IRGRP;
break;
case TOMOYO_MODE_GROUP_WRITE:
value = S_IWGRP;
break;
case TOMOYO_MODE_GROUP_EXECUTE:
value = S_IXGRP;
break;
case TOMOYO_MODE_OTHERS_READ:
value = S_IROTH;
break;
case TOMOYO_MODE_OTHERS_WRITE:
value = S_IWOTH;
break;
case TOMOYO_MODE_OTHERS_EXECUTE:
value = S_IXOTH;
break;
case TOMOYO_NUMBER_UNION:
/* Fetch values later. */
break;
default:
if (!obj)
goto out;
if (!obj->validate_done) {
tomoyo_get_attributes(obj);
obj->validate_done = true;
}
{
u8 stat_index;
struct tomoyo_mini_stat *stat;
switch (index) {
case TOMOYO_PATH1_UID:
case TOMOYO_PATH1_GID:
case TOMOYO_PATH1_INO:
case TOMOYO_PATH1_MAJOR:
case TOMOYO_PATH1_MINOR:
case TOMOYO_PATH1_TYPE:
case TOMOYO_PATH1_DEV_MAJOR:
case TOMOYO_PATH1_DEV_MINOR:
case TOMOYO_PATH1_PERM:
stat_index = TOMOYO_PATH1;
break;
case TOMOYO_PATH2_UID:
case TOMOYO_PATH2_GID:
case TOMOYO_PATH2_INO:
case TOMOYO_PATH2_MAJOR:
case TOMOYO_PATH2_MINOR:
case TOMOYO_PATH2_TYPE:
case TOMOYO_PATH2_DEV_MAJOR:
case TOMOYO_PATH2_DEV_MINOR:
case TOMOYO_PATH2_PERM:
stat_index = TOMOYO_PATH2;
break;
case TOMOYO_PATH1_PARENT_UID:
case TOMOYO_PATH1_PARENT_GID:
case TOMOYO_PATH1_PARENT_INO:
case TOMOYO_PATH1_PARENT_PERM:
stat_index =
TOMOYO_PATH1_PARENT;
break;
case TOMOYO_PATH2_PARENT_UID:
case TOMOYO_PATH2_PARENT_GID:
case TOMOYO_PATH2_PARENT_INO:
case TOMOYO_PATH2_PARENT_PERM:
stat_index =
TOMOYO_PATH2_PARENT;
break;
default:
goto out;
}
if (!obj->stat_valid[stat_index])
goto out;
stat = &obj->stat[stat_index];
switch (index) {
case TOMOYO_PATH1_UID:
case TOMOYO_PATH2_UID:
case TOMOYO_PATH1_PARENT_UID:
case TOMOYO_PATH2_PARENT_UID:
value = stat->uid;
break;
case TOMOYO_PATH1_GID:
case TOMOYO_PATH2_GID:
case TOMOYO_PATH1_PARENT_GID:
case TOMOYO_PATH2_PARENT_GID:
value = stat->gid;
break;
case TOMOYO_PATH1_INO:
case TOMOYO_PATH2_INO:
case TOMOYO_PATH1_PARENT_INO:
case TOMOYO_PATH2_PARENT_INO:
value = stat->ino;
break;
case TOMOYO_PATH1_MAJOR:
case TOMOYO_PATH2_MAJOR:
value = MAJOR(stat->dev);
break;
case TOMOYO_PATH1_MINOR:
case TOMOYO_PATH2_MINOR:
value = MINOR(stat->dev);
break;
case TOMOYO_PATH1_TYPE:
case TOMOYO_PATH2_TYPE:
value = stat->mode & S_IFMT;
break;
case TOMOYO_PATH1_DEV_MAJOR:
case TOMOYO_PATH2_DEV_MAJOR:
value = MAJOR(stat->rdev);
break;
case TOMOYO_PATH1_DEV_MINOR:
case TOMOYO_PATH2_DEV_MINOR:
value = MINOR(stat->rdev);
break;
case TOMOYO_PATH1_PERM:
case TOMOYO_PATH2_PERM:
case TOMOYO_PATH1_PARENT_PERM:
case TOMOYO_PATH2_PARENT_PERM:
value = stat->mode & S_IALLUGO;
break;
}
}
break;
}
max_v[j] = value;
min_v[j] = value;
switch (index) {
case TOMOYO_MODE_SETUID:
case TOMOYO_MODE_SETGID:
case TOMOYO_MODE_STICKY:
case TOMOYO_MODE_OWNER_READ:
case TOMOYO_MODE_OWNER_WRITE:
case TOMOYO_MODE_OWNER_EXECUTE:
case TOMOYO_MODE_GROUP_READ:
case TOMOYO_MODE_GROUP_WRITE:
case TOMOYO_MODE_GROUP_EXECUTE:
case TOMOYO_MODE_OTHERS_READ:
case TOMOYO_MODE_OTHERS_WRITE:
case TOMOYO_MODE_OTHERS_EXECUTE:
is_bitop[j] = true;
}
}
if (left == TOMOYO_NUMBER_UNION) {
/* Fetch values now. */
@ -339,6 +561,33 @@ bool tomoyo_condition(struct tomoyo_request_info *r,
}
goto out;
}
/*
* Bit operation is valid only when counterpart value
* represents permission.
*/
if (is_bitop[0] && is_bitop[1]) {
goto out;
} else if (is_bitop[0]) {
switch (right) {
case TOMOYO_PATH1_PERM:
case TOMOYO_PATH1_PARENT_PERM:
case TOMOYO_PATH2_PERM:
case TOMOYO_PATH2_PARENT_PERM:
if (!(max_v[0] & max_v[1]) == !match)
continue;
}
goto out;
} else if (is_bitop[1]) {
switch (left) {
case TOMOYO_PATH1_PERM:
case TOMOYO_PATH1_PARENT_PERM:
case TOMOYO_PATH2_PERM:
case TOMOYO_PATH2_PARENT_PERM:
if (!(max_v[0] & max_v[1]) == !match)
continue;
}
goto out;
}
/* Normal value range comparison. */
if ((min_v[0] <= max_v[1] && max_v[0] >= min_v[1]) == match)
continue;