linux-kernel - [PATCH v13 36/59] ceph: add some fscrypt guardrails

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Date:   Tue,  5 Apr 2022 15:20:07 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     idryomov@...il.com, xiubli@...hat.com
Cc:     ceph-devel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-fscrypt@...r.kernel.org, linux-kernel@...r.kernel.org,
        lhenriques@...e.de
Subject: [PATCH v13 36/59] ceph: add some fscrypt guardrails

Add the appropriate calls into fscrypt for various actions, including
link, rename, setattr, and the open codepaths.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 fs/ceph/dir.c   |  8 ++++++++
 fs/ceph/file.c  | 14 +++++++++++++-
 fs/ceph/inode.c |  4 ++++
 3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 82a5f37e9d4a..8a9f916bfc6c 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -1121,6 +1121,10 @@ static int ceph_link(struct dentry *old_dentry, struct inode *dir,
 	if (ceph_snap(dir) != CEPH_NOSNAP)
 		return -EROFS;
 
+	err = fscrypt_prepare_link(old_dentry, dir, dentry);
+	if (err)
+		return err;
+
 	dout("link in dir %p old_dentry %p dentry %p\n", dir,
 	     old_dentry, dentry);
 	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
@@ -1318,6 +1322,10 @@ static int ceph_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
 	    (!ceph_quota_is_same_realm(old_dir, new_dir)))
 		return -EXDEV;
 
+	err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
+	if (err)
+		return err;
+
 	dout("rename dir %p dentry %p to dir %p dentry %p\n",
 	     old_dir, old_dentry, new_dir, new_dentry);
 	req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index dfc02caf4229..a3afdb9cfddb 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -372,8 +372,13 @@ int ceph_open(struct inode *inode, struct file *file)
 
 	/* filter out O_CREAT|O_EXCL; vfs did that already.  yuck. */
 	flags = file->f_flags & ~(O_CREAT|O_EXCL);
-	if (S_ISDIR(inode->i_mode))
+	if (S_ISDIR(inode->i_mode)) {
 		flags = O_DIRECTORY;  /* mds likes to know */
+	} else if (S_ISREG(inode->i_mode)) {
+		err = fscrypt_file_open(inode, file);
+		if (err)
+			return err;
+	}
 
 	dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
 	     ceph_vinop(inode), file, flags, file->f_flags);
@@ -847,6 +852,13 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
 		dout("atomic_open finish_no_open on dn %p\n", dn);
 		err = finish_no_open(file, dn);
 	} else {
+		if (IS_ENCRYPTED(dir) &&
+		    !fscrypt_has_permitted_context(dir, d_inode(dentry))) {
+			pr_warn("Inconsistent encryption context (parent %llx:%llx child %llx:%llx)\n",
+				ceph_vinop(dir), ceph_vinop(d_inode(dentry)));
+			goto out_req;
+		}
+
 		dout("atomic_open finish_open on dn %p\n", dn);
 		if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
 			struct inode *newino = d_inode(dentry);
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index bb1b1a57970c..183b9f52dc7d 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -2487,6 +2487,10 @@ int ceph_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 	if (ceph_inode_is_shutdown(inode))
 		return -ESTALE;
 
+	err = fscrypt_prepare_setattr(dentry, attr);
+	if (err)
+		return err;
+
 	err = setattr_prepare(&init_user_ns, dentry, attr);
 	if (err != 0)
 		return err;
-- 
2.35.1