From patchwork Fri Jun 25 13:58:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 12345159 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E390BC48BC2 for ; Fri, 25 Jun 2021 13:58:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D0AE16198B for ; Fri, 25 Jun 2021 13:58:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231893AbhFYOBJ (ORCPT ); Fri, 25 Jun 2021 10:01:09 -0400 Received: from mail.kernel.org ([198.145.29.99]:33408 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231792AbhFYOBD (ORCPT ); Fri, 25 Jun 2021 10:01:03 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4862F6135A; Fri, 25 Jun 2021 13:58:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1624629522; bh=zoIwukf11/NJQeM6z9V2nPnV7ser0U+5+Nxe+691n5E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LmCwucmZZdB7+1IBRxJg2vLJaIso6YsEmwp0iy+Xt4Er5X7d/Tqvyi/bTTTl9r5dg c5ivzvAJ1pZGiwkK1ITkak3IR0zGkt60tJ0ApHfVUo9zojARXIa7xHxf+SVgX+2/lX JYOYAQAmg/30qunMx6NPrbNnz8AmRNx1F8h2Y9qAuxLnVj0ZZWvix6Jmbjj2G3wWME eAYAySC02yULN+7ZvmFZt7oCCPhI3VnDpA/9CzJP0iSQ96EUGP5wN+f5z8Hyq7/ytO 0IPBVkApQ0E48FAK99/MLNyqU9hx/tbmYjsig4Jsw6dQbrOa3h1lXC0feJ1JUBts5j SmBzLpP1Bphqw== From: Jeff Layton To: ceph-devel@vger.kernel.org Cc: lhenriques@suse.de, xiubli@redhat.com, linux-fsdevel@vger.kernel.org, linux-fscrypt@vger.kernel.org, dhowells@redhat.com Subject: [RFC PATCH v7 09/24] ceph: crypto context handling for ceph Date: Fri, 25 Jun 2021 09:58:19 -0400 Message-Id: <20210625135834.12934-10-jlayton@kernel.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210625135834.12934-1-jlayton@kernel.org> References: <20210625135834.12934-1-jlayton@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fscrypt@vger.kernel.org Have set_context do a setattr that sets the fscrypt_auth value, and get_context just return the contents of that field. Signed-off-by: Jeff Layton --- fs/ceph/Makefile | 1 + fs/ceph/crypto.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++ fs/ceph/crypto.h | 32 ++++++++++++++++++++ fs/ceph/inode.c | 3 ++ fs/ceph/super.c | 3 ++ 5 files changed, 116 insertions(+) create mode 100644 fs/ceph/crypto.c create mode 100644 fs/ceph/crypto.h diff --git a/fs/ceph/Makefile b/fs/ceph/Makefile index 50c635dc7f71..1f77ca04c426 100644 --- a/fs/ceph/Makefile +++ b/fs/ceph/Makefile @@ -12,3 +12,4 @@ ceph-y := super.o inode.o dir.o file.o locks.o addr.o ioctl.o \ ceph-$(CONFIG_CEPH_FSCACHE) += cache.o ceph-$(CONFIG_CEPH_FS_POSIX_ACL) += acl.o +ceph-$(CONFIG_FS_ENCRYPTION) += crypto.o diff --git a/fs/ceph/crypto.c b/fs/ceph/crypto.c new file mode 100644 index 000000000000..cdca7660f835 --- /dev/null +++ b/fs/ceph/crypto.c @@ -0,0 +1,77 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include + +#include "super.h" +#include "crypto.h" + +static int ceph_crypt_get_context(struct inode *inode, void *ctx, size_t len) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_fscrypt_auth *cfa = (struct ceph_fscrypt_auth *)ci->fscrypt_auth; + u32 ctxlen; + + /* Non existent or too short? */ + if (!cfa || (ci->fscrypt_auth_len < (offsetof(struct ceph_fscrypt_auth, cfa_blob) + 1))) + return -ENOBUFS; + + /* Some format we don't recognize? */ + if (le32_to_cpu(cfa->cfa_version) != CEPH_FSCRYPT_AUTH_VERSION) + return -ENOBUFS; + + ctxlen = le32_to_cpu(cfa->cfa_blob_len); + if (len < ctxlen) + return -ERANGE; + + memcpy(ctx, cfa->cfa_blob, ctxlen); + return ctxlen; +} + +static int ceph_crypt_set_context(struct inode *inode, const void *ctx, size_t len, void *fs_data) +{ + int ret; + struct iattr attr = { }; + struct ceph_iattr cia = { }; + struct ceph_fscrypt_auth *cfa; + + WARN_ON_ONCE(fs_data); + + if (len > FSCRYPT_SET_CONTEXT_MAX_SIZE) + return -EINVAL; + + cfa = kzalloc(sizeof(*cfa), GFP_KERNEL); + if (!cfa) + return -ENOMEM; + + cfa->cfa_version = cpu_to_le32(CEPH_FSCRYPT_AUTH_VERSION); + cfa->cfa_blob_len = cpu_to_le32(len); + memcpy(cfa->cfa_blob, ctx, len); + + cia.fscrypt_auth = cfa; + + ret = __ceph_setattr(inode, &attr, &cia); + if (ret == 0) + inode_set_flags(inode, S_ENCRYPTED, S_ENCRYPTED); + kfree(cia.fscrypt_auth); + return ret; +} + +static bool ceph_crypt_empty_dir(struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + + return ci->i_rsubdirs + ci->i_rfiles == 1; +} + +static struct fscrypt_operations ceph_fscrypt_ops = { + .get_context = ceph_crypt_get_context, + .set_context = ceph_crypt_set_context, + .empty_dir = ceph_crypt_empty_dir, + .max_namelen = NAME_MAX, +}; + +void ceph_fscrypt_set_ops(struct super_block *sb) +{ + fscrypt_set_ops(sb, &ceph_fscrypt_ops); +} diff --git a/fs/ceph/crypto.h b/fs/ceph/crypto.h new file mode 100644 index 000000000000..53c6a3f35c64 --- /dev/null +++ b/fs/ceph/crypto.h @@ -0,0 +1,32 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Ceph fscrypt functionality + */ + +#ifndef _CEPH_CRYPTO_H +#define _CEPH_CRYPTO_H + +#include + +#define CEPH_XATTR_NAME_ENCRYPTION_CONTEXT "encryption.ctx" + +#ifdef CONFIG_FS_ENCRYPTION + +#define CEPH_FSCRYPT_AUTH_VERSION 1 +struct ceph_fscrypt_auth { + __le32 cfa_version; + __le32 cfa_blob_len; + u8 cfa_blob[FSCRYPT_SET_CONTEXT_MAX_SIZE]; +} __packed; + +void ceph_fscrypt_set_ops(struct super_block *sb); + +#else /* CONFIG_FS_ENCRYPTION */ + +static inline void ceph_fscrypt_set_ops(struct super_block *sb) +{ +} + +#endif /* CONFIG_FS_ENCRYPTION */ + +#endif diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c index 7821ba04eef3..fba139a4f57b 100644 --- a/fs/ceph/inode.c +++ b/fs/ceph/inode.c @@ -14,10 +14,12 @@ #include #include #include +#include #include "super.h" #include "mds_client.h" #include "cache.h" +#include "crypto.h" #include /* @@ -647,6 +649,7 @@ void ceph_evict_inode(struct inode *inode) clear_inode(inode); ceph_fscache_unregister_inode_cookie(ci); + fscrypt_put_encryption_info(inode); __ceph_remove_caps(ci); diff --git a/fs/ceph/super.c b/fs/ceph/super.c index 9b1b7f4cfdd4..cdac6ff675e2 100644 --- a/fs/ceph/super.c +++ b/fs/ceph/super.c @@ -20,6 +20,7 @@ #include "super.h" #include "mds_client.h" #include "cache.h" +#include "crypto.h" #include #include @@ -988,6 +989,8 @@ static int ceph_set_super(struct super_block *s, struct fs_context *fc) s->s_time_min = 0; s->s_time_max = U32_MAX; + ceph_fscrypt_set_ops(s); + ret = set_anon_super_fc(s, fc); if (ret != 0) fsc->sb = NULL;