From patchwork Mon Feb 27 03:27:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiubo Li X-Patchwork-Id: 657193 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B258DC6FA8E for ; Mon, 27 Feb 2023 03:30:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230091AbjB0Dav (ORCPT ); Sun, 26 Feb 2023 22:30:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36888 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230146AbjB0Dak (ORCPT ); Sun, 26 Feb 2023 22:30:40 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D29F31C7D6 for ; Sun, 26 Feb 2023 19:29:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1677468575; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=yI2OI4MhxyN+pas6A4AUE+evzYIMNKmaGEwHuuPnBDs=; b=gA3IT+DTZ9pwy91+jtllhVziBMIvVWU8UYELhd224GDf9cvu03jgOi2ozr3ufn8NSbkVOy kvyFBe0ZY8zJnqpz+czfxJlQF9vAPEOfzTOEWxQcA1Qxm+wU2f213ioTjm9juZJ05uSho9 EjC8HmvUHI9+MueAkkGk23V1hHQvMRI= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-15-qKuLp1-kNiOMccl6x4olHg-1; Sun, 26 Feb 2023 22:29:32 -0500 X-MC-Unique: qKuLp1-kNiOMccl6x4olHg-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id C289C3C0D854; Mon, 27 Feb 2023 03:29:31 +0000 (UTC) Received: from lxbceph1.gsslab.pek2.redhat.com (unknown [10.72.47.117]) by smtp.corp.redhat.com (Postfix) with ESMTP id 008481731B; Mon, 27 Feb 2023 03:29:28 +0000 (UTC) From: xiubli@redhat.com To: idryomov@gmail.com, ceph-devel@vger.kernel.org Cc: jlayton@kernel.org, lhenriques@suse.de, vshankar@redhat.com, mchangir@redhat.com, Xiubo Li Subject: [PATCH v16 20/68] ceph: add encrypted fname handling to ceph_mdsc_build_path Date: Mon, 27 Feb 2023 11:27:25 +0800 Message-Id: <20230227032813.337906-21-xiubli@redhat.com> In-Reply-To: <20230227032813.337906-1-xiubli@redhat.com> References: <20230227032813.337906-1-xiubli@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org From: Jeff Layton Allow ceph_mdsc_build_path to encrypt and base64 encode the filename when the parent is encrypted and we're sending the path to the MDS. In most cases, we just encrypt the filenames and base64 encode them, but when the name is longer than CEPH_NOHASH_NAME_MAX, we use a similar scheme to fscrypt proper, and hash the remaning bits with sha256. When doing this, we then send along the full crypttext of the name in the new alternate_name field of the MClientRequest. The MDS can then send that along in readdir responses and traces. Reviewed-by: Xiubo Li Signed-off-by: Jeff Layton --- fs/ceph/crypto.c | 47 ++++++++++++++++++++++++++ fs/ceph/crypto.h | 8 +++++ fs/ceph/mds_client.c | 80 ++++++++++++++++++++++++++++++++++---------- 3 files changed, 117 insertions(+), 18 deletions(-) diff --git a/fs/ceph/crypto.c b/fs/ceph/crypto.c index 947ac98119aa..e54ea4c3e478 100644 --- a/fs/ceph/crypto.c +++ b/fs/ceph/crypto.c @@ -187,3 +187,50 @@ void ceph_fscrypt_as_ctx_to_req(struct ceph_mds_request *req, struct ceph_acl_se { swap(req->r_fscrypt_auth, as->fscrypt_auth); } + +int ceph_encode_encrypted_fname(const struct inode *parent, struct dentry *dentry, char *buf) +{ + u32 len; + int elen; + int ret; + u8 *cryptbuf; + + WARN_ON_ONCE(!fscrypt_has_encryption_key(parent)); + + /* + * Convert cleartext d_name to ciphertext. If result is longer than + * CEPH_NOHASH_NAME_MAX, sha256 the remaining bytes + * + * See: fscrypt_setup_filename + */ + if (!fscrypt_fname_encrypted_size(parent, dentry->d_name.len, NAME_MAX, &len)) + return -ENAMETOOLONG; + + /* Allocate a buffer appropriate to hold the result */ + cryptbuf = kmalloc(len > CEPH_NOHASH_NAME_MAX ? NAME_MAX : len, GFP_KERNEL); + if (!cryptbuf) + return -ENOMEM; + + ret = fscrypt_fname_encrypt(parent, &dentry->d_name, cryptbuf, len); + if (ret) { + kfree(cryptbuf); + return ret; + } + + /* hash the end if the name is long enough */ + if (len > CEPH_NOHASH_NAME_MAX) { + u8 hash[SHA256_DIGEST_SIZE]; + u8 *extra = cryptbuf + CEPH_NOHASH_NAME_MAX; + + /* hash the extra bytes and overwrite crypttext beyond that point with it */ + sha256(extra, len - CEPH_NOHASH_NAME_MAX, hash); + memcpy(extra, hash, SHA256_DIGEST_SIZE); + len = CEPH_NOHASH_NAME_MAX + SHA256_DIGEST_SIZE; + } + + /* base64 encode the encrypted name */ + elen = ceph_base64_encode(cryptbuf, len, buf); + kfree(cryptbuf); + dout("base64-encoded ciphertext name = %.*s\n", elen, buf); + return elen; +} diff --git a/fs/ceph/crypto.h b/fs/ceph/crypto.h index f5d38d8a1995..8abf10604722 100644 --- a/fs/ceph/crypto.h +++ b/fs/ceph/crypto.h @@ -6,6 +6,7 @@ #ifndef _CEPH_CRYPTO_H #define _CEPH_CRYPTO_H +#include #include struct ceph_fs_client; @@ -66,6 +67,7 @@ void ceph_fscrypt_free_dummy_policy(struct ceph_fs_client *fsc); int ceph_fscrypt_prepare_context(struct inode *dir, struct inode *inode, struct ceph_acl_sec_ctx *as); void ceph_fscrypt_as_ctx_to_req(struct ceph_mds_request *req, struct ceph_acl_sec_ctx *as); +int ceph_encode_encrypted_fname(const struct inode *parent, struct dentry *dentry, char *buf); #else /* CONFIG_FS_ENCRYPTION */ @@ -89,6 +91,12 @@ static inline void ceph_fscrypt_as_ctx_to_req(struct ceph_mds_request *req, struct ceph_acl_sec_ctx *as_ctx) { } + +static inline int ceph_encode_encrypted_fname(const struct inode *parent, + struct dentry *dentry, char *buf) +{ + return -EOPNOTSUPP; +} #endif /* CONFIG_FS_ENCRYPTION */ #endif diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index d371e8bfe19d..a5e5349aac38 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -14,6 +14,7 @@ #include #include "super.h" +#include "crypto.h" #include "mds_client.h" #include "crypto.h" @@ -2469,18 +2470,27 @@ static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc) return mdsc->oldest_tid; } -/* - * Build a dentry's path. Allocate on heap; caller must kfree. Based - * on build_path_from_dentry in fs/cifs/dir.c. +/** + * ceph_mdsc_build_path - build a path string to a given dentry + * @dentry: dentry to which path should be built + * @plen: returned length of string + * @pbase: returned base inode number + * @for_wire: is this path going to be sent to the MDS? + * + * Build a string that represents the path to the dentry. This is mostly called + * for two different purposes: * - * If @stop_on_nosnap, generate path relative to the first non-snapped - * inode. + * 1) we need to build a path string to send to the MDS (for_wire == true) + * 2) we need a path string for local presentation (e.g. debugfs) (for_wire == false) + * + * The path is built in reverse, starting with the dentry. Walk back up toward + * the root, building the path until the first non-snapped inode is reached (for_wire) + * or the root inode is reached (!for_wire). * * Encode hidden .snap dirs as a double /, i.e. * foo/.snap/bar -> foo//bar */ -char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase, - int stop_on_nosnap) +char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase, int for_wire) { struct dentry *cur; struct inode *inode; @@ -2502,30 +2512,65 @@ char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase, seq = read_seqbegin(&rename_lock); cur = dget(dentry); for (;;) { - struct dentry *temp; + struct dentry *parent; spin_lock(&cur->d_lock); inode = d_inode(cur); if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { dout("build_path path+%d: %p SNAPDIR\n", pos, cur); - } else if (stop_on_nosnap && inode && dentry != cur && - ceph_snap(inode) == CEPH_NOSNAP) { + spin_unlock(&cur->d_lock); + parent = dget_parent(cur); + } else if (for_wire && inode && dentry != cur && ceph_snap(inode) == CEPH_NOSNAP) { spin_unlock(&cur->d_lock); pos++; /* get rid of any prepended '/' */ break; - } else { + } else if (!for_wire || !IS_ENCRYPTED(d_inode(cur->d_parent))) { pos -= cur->d_name.len; if (pos < 0) { spin_unlock(&cur->d_lock); break; } memcpy(path + pos, cur->d_name.name, cur->d_name.len); + spin_unlock(&cur->d_lock); + parent = dget_parent(cur); + } else { + int len, ret; + char buf[NAME_MAX]; + + /* + * Proactively copy name into buf, in case we need to present + * it as-is. + */ + memcpy(buf, cur->d_name.name, cur->d_name.len); + len = cur->d_name.len; + spin_unlock(&cur->d_lock); + parent = dget_parent(cur); + + ret = __fscrypt_prepare_readdir(d_inode(parent)); + if (ret < 0) { + dput(parent); + dput(cur); + return ERR_PTR(ret); + } + + if (fscrypt_has_encryption_key(d_inode(parent))) { + len = ceph_encode_encrypted_fname(d_inode(parent), cur, buf); + if (len < 0) { + dput(parent); + dput(cur); + return ERR_PTR(len); + } + } + pos -= len; + if (pos < 0) { + dput(parent); + break; + } + memcpy(path + pos, buf, len); } - temp = cur; - spin_unlock(&temp->d_lock); - cur = dget_parent(temp); - dput(temp); + dput(cur); + cur = parent; /* Are we at the root? */ if (IS_ROOT(cur)) @@ -2549,8 +2594,7 @@ char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase, * A rename didn't occur, but somehow we didn't end up where * we thought we would. Throw a warning and try again. */ - pr_warn("build_path did not end path lookup where " - "expected, pos is %d\n", pos); + pr_warn("build_path did not end path lookup where expected (pos = %d)\n", pos); goto retry; } @@ -2570,7 +2614,7 @@ static int build_dentry_path(struct dentry *dentry, struct inode *dir, rcu_read_lock(); if (!dir) dir = d_inode_rcu(dentry->d_parent); - if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP) { + if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP && !IS_ENCRYPTED(dir)) { *pino = ceph_ino(dir); rcu_read_unlock(); *ppath = dentry->d_name.name;