From patchwork Tue Jun 13 05:23:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Xiubo Li X-Patchwork-Id: 13277983 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 5D4E6C7EE2E for ; Tue, 13 Jun 2023 05:30:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240193AbjFMFat (ORCPT ); Tue, 13 Jun 2023 01:30:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39876 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240161AbjFMFaX (ORCPT ); Tue, 13 Jun 2023 01:30:23 -0400 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 9CAAB2116 for ; Mon, 12 Jun 2023 22:28:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1686634138; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=YacXskhpxjqDE3hL9PqUzFV37GPNBTOPsmUUY+zaRX8=; b=HxHprq8d1c8PlXASJIzA6fykYTsXFHp4Zg7bGp+If+jji7BJNKgEojv4LwDkS7kcvwpYa6 ptRyU1j6c/pcUDbOVj1YAUDZD4jFhqcdkzKLTR559u1CGG+q+TeGNeN2PVKh9qCpB39Vrl RlXKJ70T/le34oMi/v4A7Bzutk5zbPc= 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-221-Yng3pIRBPGyCBWbul5JAMw-1; Tue, 13 Jun 2023 01:28:54 -0400 X-MC-Unique: Yng3pIRBPGyCBWbul5JAMw-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 284733C0ED54; Tue, 13 Jun 2023 05:28:54 +0000 (UTC) Received: from li-a71a4dcc-35d1-11b2-a85c-951838863c8d.ibm.com.com (ovpn-12-155.pek2.redhat.com [10.72.12.155]) by smtp.corp.redhat.com (Postfix) with ESMTP id 482BE1121314; Tue, 13 Jun 2023 05:28:49 +0000 (UTC) From: xiubli@redhat.com To: idryomov@gmail.com, ceph-devel@vger.kernel.org Cc: jlayton@kernel.org, vshankar@redhat.com, mchangir@redhat.com, lhenriques@suse.de, Xiubo Li Subject: [PATCH v20 31/71] ceph: add support to readdir for encrypted filenames Date: Tue, 13 Jun 2023 13:23:44 +0800 Message-Id: <20230613052424.254540-32-xiubli@redhat.com> In-Reply-To: <20230613052424.254540-1-xiubli@redhat.com> References: <20230613052424.254540-1-xiubli@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.3 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org From: Xiubo Li Once we've decrypted the names in a readdir reply, we no longer need the crypttext, so overwrite them in ceph_mds_reply_dir_entry with the unencrypted names. Then in both ceph_readdir_prepopulate() and ceph_readdir() we will use the dencrypted name directly. [ jlayton: convert some BUG_ONs into error returns ] Tested-by: Luís Henriques Tested-by: Venky Shankar Reviewed-by: Luís Henriques Signed-off-by: Xiubo Li Signed-off-by: Jeff Layton --- fs/ceph/crypto.c | 12 +++++-- fs/ceph/crypto.h | 1 + fs/ceph/dir.c | 35 +++++++++++++++---- fs/ceph/inode.c | 12 ++++--- fs/ceph/mds_client.c | 81 ++++++++++++++++++++++++++++++++++++++++---- fs/ceph/mds_client.h | 4 +-- 6 files changed, 124 insertions(+), 21 deletions(-) diff --git a/fs/ceph/crypto.c b/fs/ceph/crypto.c index ee0e0db2cf0e..1803ec7a69a9 100644 --- a/fs/ceph/crypto.c +++ b/fs/ceph/crypto.c @@ -195,7 +195,10 @@ int ceph_encode_encrypted_dname(const struct inode *parent, struct qstr *d_name, int ret; u8 *cryptbuf; - WARN_ON_ONCE(!fscrypt_has_encryption_key(parent)); + if (!fscrypt_has_encryption_key(parent)) { + memcpy(buf, d_name->name, d_name->len); + return d_name->len; + } /* * Convert cleartext d_name to ciphertext. If result is longer than @@ -237,6 +240,8 @@ int ceph_encode_encrypted_dname(const struct inode *parent, struct qstr *d_name, int ceph_encode_encrypted_fname(const struct inode *parent, struct dentry *dentry, char *buf) { + WARN_ON_ONCE(!fscrypt_has_encryption_key(parent)); + return ceph_encode_encrypted_dname(parent, &dentry->d_name, buf); } @@ -281,7 +286,10 @@ int ceph_fname_to_usr(const struct ceph_fname *fname, struct fscrypt_str *tname, * generating a nokey name via fscrypt. */ if (!fscrypt_has_encryption_key(fname->dir)) { - memcpy(oname->name, fname->name, fname->name_len); + if (fname->no_copy) + oname->name = fname->name; + else + memcpy(oname->name, fname->name, fname->name_len); oname->len = fname->name_len; if (is_nokey) *is_nokey = true; diff --git a/fs/ceph/crypto.h b/fs/ceph/crypto.h index 704e5a0e96f7..05db33f1a421 100644 --- a/fs/ceph/crypto.h +++ b/fs/ceph/crypto.h @@ -19,6 +19,7 @@ struct ceph_fname { unsigned char *ctext; // binary crypttext (if any) u32 name_len; // length of name buffer u32 ctext_len; // length of crypttext + bool no_copy; }; struct ceph_fscrypt_auth { diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c index 5b2ebd5d50cd..cb0393aa1fa6 100644 --- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -9,6 +9,7 @@ #include "super.h" #include "mds_client.h" +#include "crypto.h" /* * Directory operations: readdir, lookup, create, link, unlink, @@ -241,7 +242,9 @@ static int __dcache_readdir(struct file *file, struct dir_context *ctx, di = ceph_dentry(dentry); if (d_unhashed(dentry) || d_really_is_negative(dentry) || - di->lease_shared_gen != shared_gen) { + di->lease_shared_gen != shared_gen || + ((dentry->d_flags & DCACHE_NOKEY_NAME) && + fscrypt_has_encryption_key(dir))) { spin_unlock(&dentry->d_lock); dput(dentry); err = -EAGAIN; @@ -340,6 +343,10 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx) ctx->pos = 2; } + err = fscrypt_prepare_readdir(inode); + if (err) + return err; + spin_lock(&ci->i_ceph_lock); /* request Fx cap. if have Fx, we don't need to release Fs cap * for later create/unlink. */ @@ -389,6 +396,7 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx) req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); if (IS_ERR(req)) return PTR_ERR(req); + err = ceph_alloc_readdir_reply_buffer(req, inode); if (err) { ceph_mdsc_put_request(req); @@ -402,11 +410,20 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx) req->r_inode_drop = CEPH_CAP_FILE_EXCL; } if (dfi->last_name) { - req->r_path2 = kstrdup(dfi->last_name, GFP_KERNEL); + struct qstr d_name = { .name = dfi->last_name, + .len = strlen(dfi->last_name) }; + + req->r_path2 = kzalloc(NAME_MAX + 1, GFP_KERNEL); if (!req->r_path2) { ceph_mdsc_put_request(req); return -ENOMEM; } + + err = ceph_encode_encrypted_dname(inode, &d_name, req->r_path2); + if (err < 0) { + ceph_mdsc_put_request(req); + return err; + } } else if (is_hash_order(ctx->pos)) { req->r_args.readdir.offset_hash = cpu_to_le32(fpos_hash(ctx->pos)); @@ -511,15 +528,20 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx) for (; i < rinfo->dir_nr; i++) { struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i; - BUG_ON(rde->offset < ctx->pos); + if (rde->offset < ctx->pos) { + pr_warn("%s: rde->offset 0x%llx ctx->pos 0x%llx\n", + __func__, rde->offset, ctx->pos); + return -EIO; + } + + if (WARN_ON_ONCE(!rde->inode.in)) + return -EIO; ctx->pos = rde->offset; dout("readdir (%d/%d) -> %llx '%.*s' %p\n", i, rinfo->dir_nr, ctx->pos, rde->name_len, rde->name, &rde->inode.in); - BUG_ON(!rde->inode.in); - if (!dir_emit(ctx, rde->name, rde->name_len, ceph_present_ino(inode->i_sb, le64_to_cpu(rde->inode.in->ino)), le32_to_cpu(rde->inode.in->mode) >> 12)) { @@ -532,6 +554,8 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx) dout("filldir stopping us...\n"); return 0; } + + /* Reset the lengths to their original allocated vals */ ctx->pos++; } @@ -586,7 +610,6 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx) dfi->dir_ordered_count); spin_unlock(&ci->i_ceph_lock); } - dout("readdir %p file %p done.\n", inode, file); return 0; } diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c index 9a1d8ad9bf86..85507b057a64 100644 --- a/fs/ceph/inode.c +++ b/fs/ceph/inode.c @@ -1751,7 +1751,8 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req, struct ceph_mds_session *session) { struct dentry *parent = req->r_dentry; - struct ceph_inode_info *ci = ceph_inode(d_inode(parent)); + struct inode *inode = d_inode(parent); + struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; struct qstr dname; struct dentry *dn; @@ -1825,9 +1826,7 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req, tvino.snap = le64_to_cpu(rde->inode.in->snapid); if (rinfo->hash_order) { - u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash, - rde->name, rde->name_len); - hash = ceph_frag_value(hash); + u32 hash = ceph_frag_value(rde->raw_hash); if (hash != last_hash) fpos_offset = 2; last_hash = hash; @@ -1850,6 +1849,11 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req, err = -ENOMEM; goto out; } + if (rde->is_nokey) { + spin_lock(&dn->d_lock); + dn->d_flags |= DCACHE_NOKEY_NAME; + spin_unlock(&dn->d_lock); + } } else if (d_really_is_positive(dn) && (ceph_ino(d_inode(dn)) != tvino.ino || ceph_snap(d_inode(dn)) != tvino.snap)) { diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index 5a1171b81872..383515e20a8f 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -439,20 +439,87 @@ static int parse_reply_info_readdir(void **p, void *end, info->dir_nr = num; while (num) { + struct inode *inode = d_inode(req->r_dentry); + struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i; + struct fscrypt_str tname = FSTR_INIT(NULL, 0); + struct fscrypt_str oname = FSTR_INIT(NULL, 0); + struct ceph_fname fname; + u32 altname_len, _name_len; + u8 *altname, *_name; + /* dentry */ - ceph_decode_32_safe(p, end, rde->name_len, bad); - ceph_decode_need(p, end, rde->name_len, bad); - rde->name = *p; - *p += rde->name_len; - dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name); + ceph_decode_32_safe(p, end, _name_len, bad); + ceph_decode_need(p, end, _name_len, bad); + _name = *p; + *p += _name_len; + dout("parsed dir dname '%.*s'\n", _name_len, _name); + + if (info->hash_order) + rde->raw_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash, + _name, _name_len); /* dentry lease */ err = parse_reply_info_lease(p, end, &rde->lease, features, - &rde->altname_len, &rde->altname); + &altname_len, &altname); if (err) goto out_bad; + /* + * Try to dencrypt the dentry names and update them + * in the ceph_mds_reply_dir_entry struct. + */ + fname.dir = inode; + fname.name = _name; + fname.name_len = _name_len; + fname.ctext = altname; + fname.ctext_len = altname_len; + /* + * The _name_len maybe larger than altname_len, such as + * when the human readable name length is in range of + * (CEPH_NOHASH_NAME_MAX, CEPH_NOHASH_NAME_MAX + SHA256_DIGEST_SIZE), + * then the copy in ceph_fname_to_usr will corrupt the + * data if there has no encryption key. + * + * Just set the no_copy flag and then if there has no + * encryption key the oname.name will be assigned to + * _name always. + */ + fname.no_copy = true; + if (altname_len == 0) { + /* + * Set tname to _name, and this will be used + * to do the base64_decode in-place. It's + * safe because the decoded string should + * always be shorter, which is 3/4 of origin + * string. + */ + tname.name = _name; + + /* + * Set oname to _name too, and this will be + * used to do the dencryption in-place. + */ + oname.name = _name; + oname.len = _name_len; + } else { + /* + * This will do the decryption only in-place + * from altname cryptext directly. + */ + oname.name = altname; + oname.len = altname_len; + } + rde->is_nokey = false; + err = ceph_fname_to_usr(&fname, &tname, &oname, &rde->is_nokey); + if (err) { + pr_err("%s unable to decode %.*s, got %d\n", __func__, + _name_len, _name, err); + goto out_bad; + } + rde->name = oname.name; + rde->name_len = oname.len; + /* inode */ err = parse_reply_info_in(p, end, &rde->inode, features); if (err < 0) @@ -3685,7 +3752,7 @@ static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg) if (err == 0) { if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR || req->r_op == CEPH_MDS_OP_LSSNAP)) - ceph_readdir_prepopulate(req, req->r_session); + err = ceph_readdir_prepopulate(req, req->r_session); } current->journal_info = NULL; mutex_unlock(&req->r_fill_mutex); diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h index 7a3d1b01aa36..bd3fafd7055b 100644 --- a/fs/ceph/mds_client.h +++ b/fs/ceph/mds_client.h @@ -96,10 +96,10 @@ struct ceph_mds_reply_info_in { }; struct ceph_mds_reply_dir_entry { + bool is_nokey; char *name; - u8 *altname; u32 name_len; - u32 altname_len; + u32 raw_hash; struct ceph_mds_reply_lease *lease; struct ceph_mds_reply_info_in inode; loff_t offset;