From: Xiubo Li <xiubli@xxxxxxxxxx> 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 ] Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx> Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx> --- 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 420a2cc1a8e5..c331b895c430 100644 --- a/fs/ceph/crypto.c +++ b/fs/ceph/crypto.c @@ -135,7 +135,10 @@ 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 @@ -177,6 +180,8 @@ 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); } @@ -221,7 +226,10 @@ 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 e54150260eba..080905b0c73c 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 caf2547c3fe1..5ce2a6384e55 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 9585162200f6..8f0ba67ec78f 100644 --- a/fs/ceph/inode.c +++ b/fs/ceph/inode.c @@ -1747,7 +1747,8 @@ 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; @@ -1821,9 +1822,7 @@ 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; @@ -1846,6 +1845,11 @@ 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 d11599bb85f6..a747ea7b7647 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) @@ -3472,7 +3539,7 @@ 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 cd719691a86d..046a9368c4a9 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; -- 2.35.1
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