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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2011-07-08 06:22:41 +0200
committerJames Morris <jmorris@namei.org>2011-07-11 03:05:32 +0200
commit8761afd49ebff8ae04c1a7888af090177441d07d (patch)
treef43b52e1b8467eeea465762d2f9d0b81a336faa0 /security/tomoyo/condition.c
parentTOMOYO: Allow using UID/GID etc. of current thread as conditions. (diff)
downloadlinux-8761afd49ebff8ae04c1a7888af090177441d07d.tar.xz
linux-8761afd49ebff8ae04c1a7888af090177441d07d.zip
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>
Diffstat (limited to 'security/tomoyo/condition.c')
-rw-r--r--security/tomoyo/condition.c249
1 files changed, 249 insertions, 0 deletions
diff --git a/security/tomoyo/condition.c b/security/tomoyo/condition.c
index 0692df3cddcc..ac7ebeb47d7d 100644
--- a/security/tomoyo/condition.c
+++ b/security/tomoyo/condition.c
@@ -244,6 +244,54 @@ out:
}
/**
+ * 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.
*
* @r: Pointer to "struct tomoyo_request_info".
@@ -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;