From patchwork Tue Mar 22 14:12:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 12788418 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 447B7C433F5 for ; Tue, 22 Mar 2022 14:13:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236573AbiCVOPO (ORCPT ); Tue, 22 Mar 2022 10:15:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50688 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236375AbiCVOPC (ORCPT ); Tue, 22 Mar 2022 10:15:02 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5D4407E5B2; Tue, 22 Mar 2022 07:13:30 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 15910B81D0C; Tue, 22 Mar 2022 14:13:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 13D9BC340F4; Tue, 22 Mar 2022 14:13:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1647958408; bh=t843GNSlBQ+OLnAhDLhjaKymftIPqAwDBvnnD6Yt9Ws=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=utZl0Tnt7b0g0CW91nrRnDMnpmWme7i5B5DXydfnF38ljBA5AXtvHu+hfdXf0Jn9L 6Cg5/QxCkpgKBm/J8Sul/UKcql+U8R0aBEfn4FuaXiFZWDKBifFeUKe2BP10oBulcx 1Ln6RrqzlsDQtfL+i2bLcc20IkWoNMTJnKvMPvbrLQseDCgUXD1Bhw6gRHM700TkDF kzYr6iIVnOAeNoDFOkURIYPBfHlf2q/QTZy4P7A8yvFt/yyQt74Hz56Z1sCX0IxTqC gnyrMmgiNvU/W44GNLvwLQO/xG+dpSaCsirHHJcZSyLPD3c8vvVFBSkXkuLANns3L0 u6Iw+CntzitHQ== From: Jeff Layton To: idryomov@gmail.com, xiubli@redhat.com Cc: ceph-devel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-fscrypt@vger.kernel.org, linux-kernel@vger.kernel.org, lhenriques@suse.de Subject: [RFC PATCH v11 10/51] ceph: implement -o test_dummy_encryption mount option Date: Tue, 22 Mar 2022 10:12:35 -0400 Message-Id: <20220322141316.41325-11-jlayton@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220322141316.41325-1-jlayton@kernel.org> References: <20220322141316.41325-1-jlayton@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fscrypt@vger.kernel.org Add support for the test_dummy_encryption mount option. This allows us to test the encrypted codepaths in ceph without having to manually set keys, etc. Signed-off-by: Jeff Layton --- fs/ceph/crypto.c | 53 ++++++++++++++++++++++++++++++++ fs/ceph/crypto.h | 26 ++++++++++++++++ fs/ceph/inode.c | 10 ++++-- fs/ceph/super.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++-- fs/ceph/super.h | 12 +++++++- fs/ceph/xattr.c | 3 ++ 6 files changed, 178 insertions(+), 6 deletions(-) diff --git a/fs/ceph/crypto.c b/fs/ceph/crypto.c index a513ff373b13..017f31eacb74 100644 --- a/fs/ceph/crypto.c +++ b/fs/ceph/crypto.c @@ -4,6 +4,7 @@ #include #include "super.h" +#include "mds_client.h" #include "crypto.h" static int ceph_crypt_get_context(struct inode *inode, void *ctx, size_t len) @@ -64,9 +65,20 @@ static bool ceph_crypt_empty_dir(struct inode *inode) return ci->i_rsubdirs + ci->i_rfiles == 1; } +void ceph_fscrypt_free_dummy_policy(struct ceph_fs_client *fsc) +{ + fscrypt_free_dummy_policy(&fsc->dummy_enc_policy); +} + +static const union fscrypt_policy *ceph_get_dummy_policy(struct super_block *sb) +{ + return ceph_sb_to_client(sb)->dummy_enc_policy.policy; +} + static struct fscrypt_operations ceph_fscrypt_ops = { .get_context = ceph_crypt_get_context, .set_context = ceph_crypt_set_context, + .get_dummy_policy = ceph_get_dummy_policy, .empty_dir = ceph_crypt_empty_dir, }; @@ -74,3 +86,44 @@ 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; + bool encrypted = false; + struct ceph_inode_info *ci = ceph_inode(inode); + + ret = fscrypt_prepare_new_inode(dir, inode, &encrypted); + if (ret) + return ret; + if (!encrypted) + return 0; + + as->fscrypt_auth = kzalloc(sizeof(*as->fscrypt_auth), GFP_KERNEL); + if (!as->fscrypt_auth) + return -ENOMEM; + + ctxsize = fscrypt_context_for_new_inode(as->fscrypt_auth->cfa_blob, inode); + if (ctxsize < 0) + return ctxsize; + + as->fscrypt_auth->cfa_version = cpu_to_le32(CEPH_FSCRYPT_AUTH_VERSION); + as->fscrypt_auth->cfa_blob_len = cpu_to_le32(ctxsize); + + WARN_ON_ONCE(ci->fscrypt_auth); + kfree(ci->fscrypt_auth); + ci->fscrypt_auth_len = ceph_fscrypt_auth_len(as->fscrypt_auth); + ci->fscrypt_auth = kmemdup(as->fscrypt_auth, ci->fscrypt_auth_len, GFP_KERNEL); + if (!ci->fscrypt_auth) + return -ENOMEM; + + inode->i_flags |= S_ENCRYPTED; + + return 0; +} + +void ceph_fscrypt_as_ctx_to_req(struct ceph_mds_request *req, struct ceph_acl_sec_ctx *as) +{ + swap(req->r_fscrypt_auth, as->fscrypt_auth); +} diff --git a/fs/ceph/crypto.h b/fs/ceph/crypto.h index 6dca674f79b8..cb00fe42d5b7 100644 --- a/fs/ceph/crypto.h +++ b/fs/ceph/crypto.h @@ -8,6 +8,10 @@ #include +struct ceph_fs_client; +struct ceph_acl_sec_ctx; +struct ceph_mds_request; + struct ceph_fscrypt_auth { __le32 cfa_version; __le32 cfa_blob_len; @@ -25,12 +29,34 @@ static inline u32 ceph_fscrypt_auth_len(struct ceph_fscrypt_auth *fa) #ifdef CONFIG_FS_ENCRYPTION void ceph_fscrypt_set_ops(struct super_block *sb); +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); + #else /* CONFIG_FS_ENCRYPTION */ 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; +} + +static inline void ceph_fscrypt_as_ctx_to_req(struct ceph_mds_request *req, + struct ceph_acl_sec_ctx *as_ctx) +{ +} #endif /* CONFIG_FS_ENCRYPTION */ #endif diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c index c52625f4b5f4..9043761bd9c8 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); @@ -101,6 +106,7 @@ void ceph_as_ctx_to_req(struct ceph_mds_request *req, struct ceph_acl_sec_ctx *a req->r_pagelist = as_ctx->pagelist; as_ctx->pagelist = NULL; } + ceph_fscrypt_as_ctx_to_req(req, as_ctx); } /** diff --git a/fs/ceph/super.c b/fs/ceph/super.c index 52ff78f0462a..6a2044d61420 100644 --- a/fs/ceph/super.c +++ b/fs/ceph/super.c @@ -47,6 +47,7 @@ static void ceph_put_super(struct super_block *s) struct ceph_fs_client *fsc = ceph_sb_to_client(s); dout("put_super\n"); + ceph_fscrypt_free_dummy_policy(fsc); ceph_mdsc_close_sessions(fsc->mdsc); } @@ -150,6 +151,7 @@ enum { Opt_recover_session, Opt_source, Opt_mon_addr, + Opt_test_dummy_encryption, /* string args above */ Opt_dirstat, Opt_rbytes, @@ -192,6 +194,7 @@ static const struct fs_parameter_spec ceph_mount_parameters[] = { fsparam_string ("fsc", Opt_fscache), // fsc=... fsparam_flag_no ("ino32", Opt_ino32), fsparam_string ("mds_namespace", Opt_mds_namespace), + fsparam_string ("mon_addr", Opt_mon_addr), fsparam_flag_no ("poolperm", Opt_poolperm), fsparam_flag_no ("quotadf", Opt_quotadf), fsparam_u32 ("rasize", Opt_rasize), @@ -203,7 +206,8 @@ static const struct fs_parameter_spec ceph_mount_parameters[] = { fsparam_u32 ("rsize", Opt_rsize), fsparam_string ("snapdirname", Opt_snapdirname), fsparam_string ("source", Opt_source), - fsparam_string ("mon_addr", Opt_mon_addr), + fsparam_flag ("test_dummy_encryption", Opt_test_dummy_encryption), + fsparam_string ("test_dummy_encryption", Opt_test_dummy_encryption), fsparam_u32 ("wsize", Opt_wsize), fsparam_flag_no ("wsync", Opt_wsync), fsparam_flag_no ("pagecache", Opt_pagecache), @@ -583,6 +587,17 @@ static int ceph_parse_mount_param(struct fs_context *fc, else fsopt->flags |= CEPH_MOUNT_OPT_SPARSEREAD; break; + case Opt_test_dummy_encryption: +#ifdef CONFIG_FS_ENCRYPTION + kfree(fsopt->test_dummy_encryption); + fsopt->test_dummy_encryption = param->string; + param->string = NULL; + fsopt->flags |= CEPH_MOUNT_OPT_TEST_DUMMY_ENC; +#else + warnfc(fc, + "FS encryption not supported: test_dummy_encryption mount option ignored"); +#endif + break; default: BUG(); } @@ -603,6 +618,7 @@ static void destroy_mount_options(struct ceph_mount_options *args) kfree(args->server_path); kfree(args->fscache_uniq); kfree(args->mon_addr); + kfree(args->test_dummy_encryption); kfree(args); } @@ -722,6 +738,8 @@ static int ceph_show_options(struct seq_file *m, struct dentry *root) if (fsopt->flags & CEPH_MOUNT_OPT_SPARSEREAD) seq_puts(m, ",sparseread"); + fscrypt_show_test_dummy_encryption(m, ',', root->d_sb); + if (fsopt->wsize != CEPH_MAX_WRITE_SIZE) seq_printf(m, ",wsize=%u", fsopt->wsize); if (fsopt->rsize != CEPH_MAX_READ_SIZE) @@ -1056,6 +1074,52 @@ static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, return root; } +#ifdef CONFIG_FS_ENCRYPTION +static int ceph_set_test_dummy_encryption(struct super_block *sb, struct fs_context *fc, + struct ceph_mount_options *fsopt) +{ + /* + * No changing encryption context on remount. Note that + * fscrypt_set_test_dummy_encryption will validate the version + * string passed in (if any). + */ + if (fsopt->flags & CEPH_MOUNT_OPT_TEST_DUMMY_ENC) { + struct ceph_fs_client *fsc = sb->s_fs_info; + int err = 0; + + if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE && !fsc->dummy_enc_policy.policy) { + errorfc(fc, "Can't set test_dummy_encryption on remount"); + return -EEXIST; + } + + err = fscrypt_set_test_dummy_encryption(sb, + fsc->mount_options->test_dummy_encryption, + &fsc->dummy_enc_policy); + if (err) { + if (err == -EEXIST) + errorfc(fc, "Can't change test_dummy_encryption on remount"); + else if (err == -EINVAL) + errorfc(fc, "Value of option \"%s\" is unrecognized", + fsc->mount_options->test_dummy_encryption); + else + errorfc(fc, "Error processing option \"%s\" [%d]", + fsc->mount_options->test_dummy_encryption, err); + return err; + } + warnfc(fc, "test_dummy_encryption mode enabled"); + } + return 0; +} +#else +static inline int ceph_set_test_dummy_encryption(struct super_block *sb, struct fs_context *fc, + struct ceph_mount_options *fsopt) +{ + if (fsopt->flags & CEPH_MOUNT_OPT_TEST_DUMMY_ENC) + warnfc(fc, "test_dummy_encryption mode ignored"); + return 0; +} +#endif + /* * mount: join the ceph cluster, and open root directory. */ @@ -1084,6 +1148,10 @@ static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc, goto out; } + err = ceph_set_test_dummy_encryption(fsc->sb, fc, fsc->mount_options); + if (err) + goto out; + dout("mount opening path '%s'\n", path); ceph_fs_debugfs_init(fsc); @@ -1292,9 +1360,15 @@ static void ceph_free_fc(struct fs_context *fc) static int ceph_reconfigure_fc(struct fs_context *fc) { + int err; struct ceph_parse_opts_ctx *pctx = fc->fs_private; struct ceph_mount_options *fsopt = pctx->opts; - struct ceph_fs_client *fsc = ceph_sb_to_client(fc->root->d_sb); + struct super_block *sb = fc->root->d_sb; + struct ceph_fs_client *fsc = ceph_sb_to_client(sb); + + err = ceph_set_test_dummy_encryption(sb, fc, fsopt); + if (err) + return err; if (fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS) ceph_set_mount_opt(fsc, ASYNC_DIROPS); @@ -1313,7 +1387,7 @@ static int ceph_reconfigure_fc(struct fs_context *fc) pr_notice("ceph: monitor addresses recorded, but not used for reconnection"); } - sync_filesystem(fc->root->d_sb); + sync_filesystem(sb); return 0; } diff --git a/fs/ceph/super.h b/fs/ceph/super.h index b05ae8899a1a..8f5fdb59344c 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -17,6 +17,7 @@ #include #include #include +#include #include @@ -24,6 +25,8 @@ #include #endif +#include "crypto.h" + /* large granularity for statfs utilization stats to facilitate * large volume sizes on 32-bit machines. */ #define CEPH_BLOCK_SHIFT 22 /* 4 MB */ @@ -44,6 +47,7 @@ #define CEPH_MOUNT_OPT_ASYNC_DIROPS (1<<15) /* allow async directory ops */ #define CEPH_MOUNT_OPT_NOPAGECACHE (1<<16) /* bypass pagecache altogether */ #define CEPH_MOUNT_OPT_SPARSEREAD (1<<17) /* always do sparse reads */ +#define CEPH_MOUNT_OPT_TEST_DUMMY_ENC (1<<18) /* enable dummy encryption (for testing) */ #define CEPH_MOUNT_OPT_DEFAULT \ (CEPH_MOUNT_OPT_DCACHE | \ @@ -107,6 +111,7 @@ struct ceph_mount_options { char *server_path; /* default NULL (means "/") */ char *fscache_uniq; /* default NULL */ char *mon_addr; + char *test_dummy_encryption; /* default NULL */ }; struct ceph_fs_client { @@ -146,9 +151,11 @@ struct ceph_fs_client { #ifdef CONFIG_CEPH_FSCACHE struct fscache_volume *fscache; #endif +#ifdef CONFIG_FS_ENCRYPTION + struct fscrypt_dummy_policy dummy_enc_policy; +#endif }; - /* * File i/o capability. This tracks shared state with the metadata * server that allows us to cache or writeback attributes or to read @@ -1091,6 +1098,9 @@ struct ceph_acl_sec_ctx { #ifdef CONFIG_CEPH_FS_SECURITY_LABEL void *sec_ctx; u32 sec_ctxlen; +#endif +#ifdef CONFIG_FS_ENCRYPTION + struct ceph_fscrypt_auth *fscrypt_auth; #endif struct ceph_pagelist *pagelist; }; diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c index 8c2dc2c762a4..58628cef4207 100644 --- a/fs/ceph/xattr.c +++ b/fs/ceph/xattr.c @@ -1397,6 +1397,9 @@ void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx) #endif #ifdef CONFIG_CEPH_FS_SECURITY_LABEL security_release_secctx(as_ctx->sec_ctx, as_ctx->sec_ctxlen); +#endif +#ifdef CONFIG_FS_ENCRYPTION + kfree(as_ctx->fscrypt_auth); #endif if (as_ctx->pagelist) ceph_pagelist_release(as_ctx->pagelist);