From patchwork Tue Apr 13 17:50:40 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 12201179 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=-19.0 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_NONE,USER_AGENT_GIT autolearn=unavailable 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 CE07BC43603 for ; Tue, 13 Apr 2021 17:51:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ADCEE613BF for ; Tue, 13 Apr 2021 17:51:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347436AbhDMRv0 (ORCPT ); Tue, 13 Apr 2021 13:51:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:44836 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347370AbhDMRvT (ORCPT ); Tue, 13 Apr 2021 13:51:19 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C693E613BF; Tue, 13 Apr 2021 17:50:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1618336259; bh=OW4MHHf5rp9P71PGIzqBnNXqp1zREuHD6m8yPXu4jXo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KgbK4E5Sjb/zwj2mNY7OjDrxTvFCRK3xiNbmVBOEigbaEbXVx2ZnkcBn2lnR7CYWw d+XohHcwG0UiQnhzCLfj5+5SsD+b75MNlsmVurCj7byjwhs2qZhD62wMAZUIssqypi QVy+OJHIWCshmBwyEDMmscN8ub8Akw1AbjBDTK6pQSGydKVHVoVqhV1BqC6o9jkaIh kYkRHe7sJwVyjAqsV0H+F+IdKm448prPFmU9KGV+Tfi4t5fdWNiJLh+k9kob43W/7T biW7WfD01ffuAsoWJPmMl4cwydqi1rfHxxqaRnw4GIw2WLHWlRCC3F/PEEfys77O8F t1DrBAMqavHfw== From: Jeff Layton To: ceph-devel@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-fscrypt@vger.kernel.org, lhenriques@suse.de Subject: [RFC PATCH v6 08/20] ceph: add routine to create fscrypt context prior to RPC Date: Tue, 13 Apr 2021 13:50:40 -0400 Message-Id: <20210413175052.163865-9-jlayton@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210413175052.163865-1-jlayton@kernel.org> References: <20210413175052.163865-1-jlayton@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org After pre-creating a new inode, do an fscrypt prepare on it, fetch a new encryption context and then marshal that into the security context to be sent along with the RPC. Call the new function from ceph_new_inode. Signed-off-by: Jeff Layton --- fs/ceph/crypto.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++ fs/ceph/crypto.h | 12 ++++++++++ fs/ceph/inode.c | 9 +++++-- fs/ceph/super.h | 3 +++ 4 files changed, 83 insertions(+), 2 deletions(-) diff --git a/fs/ceph/crypto.c b/fs/ceph/crypto.c index 879d9a0d3751..f037a4939026 100644 --- a/fs/ceph/crypto.c +++ b/fs/ceph/crypto.c @@ -46,3 +46,64 @@ void ceph_fscrypt_set_ops(struct super_block *sb) { fscrypt_set_ops(sb, &ceph_fscrypt_ops); } + +int ceph_fscrypt_prepare_context(struct inode *dir, struct inode *inode, + struct ceph_acl_sec_ctx *as) +{ + int ret, ctxsize; + size_t name_len; + char *name; + struct ceph_pagelist *pagelist = as->pagelist; + bool encrypted = false; + + ret = fscrypt_prepare_new_inode(dir, inode, &encrypted); + if (ret) + return ret; + if (!encrypted) + return 0; + + inode->i_flags |= S_ENCRYPTED; + + ctxsize = fscrypt_context_for_new_inode(&as->fscrypt, inode); + if (ctxsize < 0) + return ctxsize; + + /* marshal it in page array */ + if (!pagelist) { + pagelist = ceph_pagelist_alloc(GFP_KERNEL); + if (!pagelist) + return -ENOMEM; + ret = ceph_pagelist_reserve(pagelist, PAGE_SIZE); + if (ret) + goto out; + ceph_pagelist_encode_32(pagelist, 1); + } + + name = CEPH_XATTR_NAME_ENCRYPTION_CONTEXT; + name_len = strlen(name); + ret = ceph_pagelist_reserve(pagelist, 4 * 2 + name_len + ctxsize); + if (ret) + goto out; + + if (as->pagelist) { + BUG_ON(pagelist->length <= sizeof(__le32)); + if (list_is_singular(&pagelist->head)) { + le32_add_cpu((__le32*)pagelist->mapped_tail, 1); + } else { + struct page *page = list_first_entry(&pagelist->head, + struct page, lru); + void *addr = kmap_atomic(page); + le32_add_cpu((__le32*)addr, 1); + kunmap_atomic(addr); + } + } + + ceph_pagelist_encode_32(pagelist, name_len); + ceph_pagelist_append(pagelist, name, name_len); + ceph_pagelist_encode_32(pagelist, ctxsize); + ceph_pagelist_append(pagelist, as->fscrypt, ctxsize); +out: + if (pagelist && !as->pagelist) + ceph_pagelist_release(pagelist); + return ret; +} diff --git a/fs/ceph/crypto.h b/fs/ceph/crypto.h index 0dd043b56096..cc4e481bf13a 100644 --- a/fs/ceph/crypto.h +++ b/fs/ceph/crypto.h @@ -18,6 +18,9 @@ static inline void ceph_fscrypt_free_dummy_policy(struct ceph_fs_client *fsc) fscrypt_free_dummy_policy(&fsc->dummy_enc_policy); } +int ceph_fscrypt_prepare_context(struct inode *dir, struct inode *inode, + struct ceph_acl_sec_ctx *as); + #else /* CONFIG_FS_ENCRYPTION */ static inline void ceph_fscrypt_set_ops(struct super_block *sb) @@ -27,6 +30,15 @@ static inline void ceph_fscrypt_set_ops(struct super_block *sb) static inline void ceph_fscrypt_free_dummy_policy(struct ceph_fs_client *fsc) { } + +static inline int ceph_fscrypt_prepare_context(struct inode *dir, struct inode *inode, + struct ceph_acl_sec_ctx *as) +{ + if (IS_ENCRYPTED(dir)) + return -EOPNOTSUPP; + return 0; +} + #endif /* CONFIG_FS_ENCRYPTION */ #endif diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c index 7cf919b530db..e20d1da9fe71 100644 --- a/fs/ceph/inode.c +++ b/fs/ceph/inode.c @@ -83,12 +83,17 @@ struct inode *ceph_new_inode(struct inode *dir, struct dentry *dentry, goto out_err; } + inode->i_state = 0; + inode->i_mode = *mode; + err = ceph_security_init_secctx(dentry, *mode, as_ctx); if (err < 0) goto out_err; - inode->i_state = 0; - inode->i_mode = *mode; + err = ceph_fscrypt_prepare_context(dir, inode, as_ctx); + if (err) + goto out_err; + return inode; out_err: iput(inode); diff --git a/fs/ceph/super.h b/fs/ceph/super.h index fa3a87a4d233..49356f9137ba 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -1055,6 +1055,9 @@ struct ceph_acl_sec_ctx { #ifdef CONFIG_CEPH_FS_SECURITY_LABEL void *sec_ctx; u32 sec_ctxlen; +#endif +#ifdef CONFIG_FS_ENCRYPTION + u8 fscrypt[FSCRYPT_SET_CONTEXT_MAX_SIZE]; #endif struct ceph_pagelist *pagelist; };