From: Jeff Layton <jlayton@kernel.org>
Date: Tue, 8 Sep 2020 09:47:40 -0400
Subject: ceph: implement -o test_dummy_encryption mount option
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Git-commit: 6b5717bd30ab7f35792d20b71211055bdb43e6de
Patch-mainline: v6.6-rc1
References: jsc#SES-1880
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.
[ lhenriques: fix potential fsc->fsc_dummy_enc_policy memory leak in
ceph_real_mount() ]
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Reviewed-and-tested-by: Luís Henriques <lhenriques@suse.de>
Reviewed-by: Milind Changire <mchangir@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
[added call to fscrypt_add_test_dummy_key() as we don't have commit
60e463f0be98 ("fscrypt: add the test dummy encryption key on-demand")]
Acked-by: Luis Henriques <lhenriques@suse.de>
---
fs/ceph/crypto.c | 56 +++++++++++++++++++++++++++++++++
fs/ceph/crypto.h | 28 ++++++++++++++++
fs/ceph/inode.c | 10 ++++-
fs/ceph/super.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
fs/ceph/super.h | 9 ++++-
fs/ceph/xattr.c | 3 +
6 files changed, 193 insertions(+), 6 deletions(-)
--- a/fs/ceph/crypto.c
+++ b/fs/ceph/crypto.c
@@ -4,6 +4,7 @@
#include <linux/fscrypt.h>
#include "super.h"
+#include "mds_client.h"
#include "crypto.h"
static int ceph_crypt_get_context(struct inode *inode, void *ctx, size_t len)
@@ -65,9 +66,15 @@ static bool ceph_crypt_empty_dir(struct
return ci->i_rsubdirs + ci->i_rfiles == 1;
}
+static const union fscrypt_policy *ceph_get_dummy_policy(struct super_block *sb)
+{
+ return ceph_sb_to_client(sb)->fsc_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,
};
@@ -75,3 +82,52 @@ void ceph_fscrypt_set_ops(struct super_b
{
fscrypt_set_ops(sb, &ceph_fscrypt_ops);
}
+
+void ceph_fscrypt_free_dummy_policy(struct ceph_fs_client *fsc)
+{
+ fscrypt_free_dummy_policy(&fsc->fsc_dummy_enc_policy);
+}
+
+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);
+}
--- a/fs/ceph/crypto.h
+++ b/fs/ceph/crypto.h
@@ -8,6 +8,10 @@
#include <linux/fscrypt.h>
+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 +29,36 @@ static inline u32 ceph_fscrypt_auth_len(
#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
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -83,12 +83,17 @@ struct inode *ceph_new_inode(struct inod
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);
@@ -102,6 +107,7 @@ void ceph_as_ctx_to_req(struct ceph_mds_
req->r_pagelist = as_ctx->pagelist;
as_ctx->pagelist = NULL;
}
+ ceph_fscrypt_as_ctx_to_req(req, as_ctx);
}
/**
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -47,6 +47,7 @@ static void ceph_put_super(struct super_
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);
}
@@ -152,6 +153,7 @@ enum {
Opt_recover_session,
Opt_source,
Opt_mon_addr,
+ Opt_test_dummy_encryption,
/* string args above */
Opt_dirstat,
Opt_rbytes,
@@ -194,6 +196,7 @@ static const struct fs_parameter_spec ce
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),
@@ -205,7 +208,8 @@ static const struct fs_parameter_spec ce
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),
@@ -585,6 +589,23 @@ static int ceph_parse_mount_param(struct
else
fsopt->flags |= CEPH_MOUNT_OPT_SPARSEREAD;
break;
+ case Opt_test_dummy_encryption:
+#ifdef CONFIG_FS_ENCRYPTION
+ fscrypt_free_dummy_policy(&fsopt->dummy_enc_policy);
+ ret = fscrypt_parse_test_dummy_encryption(param,
+ &fsopt->dummy_enc_policy);
+ if (ret == -EINVAL) {
+ warnfc(fc, "Value of option \"%s\" is unrecognized",
+ param->key);
+ } else if (ret == -EEXIST) {
+ warnfc(fc, "Conflicting test_dummy_encryption options");
+ ret = -EINVAL;
+ }
+#else
+ warnfc(fc,
+ "FS encryption not supported: test_dummy_encryption mount option ignored");
+#endif
+ break;
default:
BUG();
}
@@ -605,6 +626,7 @@ static void destroy_mount_options(struct
kfree(args->server_path);
kfree(args->fscache_uniq);
kfree(args->mon_addr);
+ fscrypt_free_dummy_policy(&args->dummy_enc_policy);
kfree(args);
}
@@ -724,6 +746,8 @@ static int ceph_show_options(struct seq_
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)
@@ -1061,6 +1085,57 @@ out:
return root;
}
+#ifdef CONFIG_FS_ENCRYPTION
+static int ceph_apply_test_dummy_encryption(struct super_block *sb,
+ struct fs_context *fc,
+ struct ceph_mount_options *fsopt)
+{
+ struct ceph_fs_client *fsc = sb->s_fs_info;
+ int err;
+
+ if (!fscrypt_is_dummy_policy_set(&fsopt->dummy_enc_policy))
+ return 0;
+
+ /* No changing encryption context on remount. */
+ if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE &&
+ !fscrypt_is_dummy_policy_set(&fsc->fsc_dummy_enc_policy)) {
+ if (fscrypt_dummy_policies_equal(&fsopt->dummy_enc_policy,
+ &fsc->fsc_dummy_enc_policy))
+ return 0;
+ errorfc(fc, "Can't set test_dummy_encryption on remount");
+ return -EINVAL;
+ }
+
+ /* Also make sure fsopt doesn't contain a conflicting value. */
+ if (fscrypt_is_dummy_policy_set(&fsc->fsc_dummy_enc_policy)) {
+ if (fscrypt_dummy_policies_equal(&fsopt->dummy_enc_policy,
+ &fsc->fsc_dummy_enc_policy))
+ return 0;
+ errorfc(fc, "Conflicting test_dummy_encryption options");
+ return -EINVAL;
+ }
+
+ fsc->fsc_dummy_enc_policy = fsopt->dummy_enc_policy;
+ memset(&fsopt->dummy_enc_policy, 0, sizeof(fsopt->dummy_enc_policy));
+
+ err = fscrypt_add_test_dummy_key(sb, &fsc->fsc_dummy_enc_policy);
+ if (err) {
+ errorfc(fc, "Error adding test dummy encryption key, %d", err);
+ return err;
+ }
+
+ warnfc(fc, "test_dummy_encryption mode enabled");
+ return 0;
+}
+#else
+static int ceph_apply_test_dummy_encryption(struct super_block *sb,
+ struct fs_context *fc,
+ struct ceph_mount_options *fsopt)
+{
+ return 0;
+}
+#endif
+
/*
* mount: join the ceph cluster, and open root directory.
*/
@@ -1089,6 +1164,11 @@ static struct dentry *ceph_real_mount(st
goto out;
}
+ err = ceph_apply_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);
@@ -1110,6 +1190,7 @@ static struct dentry *ceph_real_mount(st
out:
mutex_unlock(&fsc->client->mount_mutex);
+ ceph_fscrypt_free_dummy_policy(fsc);
return ERR_PTR(err);
}
@@ -1298,9 +1379,15 @@ static void ceph_free_fc(struct fs_conte
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_apply_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);
@@ -1319,7 +1406,7 @@ static int ceph_reconfigure_fc(struct fs
pr_notice("ceph: monitor addresses recorded, but not used for reconnection");
}
- sync_filesystem(fc->root->d_sb);
+ sync_filesystem(sb);
return 0;
}
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -22,6 +22,7 @@
#include <linux/hashtable.h>
#include <linux/ceph/libceph.h>
+#include "crypto.h"
/* large granularity for statfs utilization stats to facilitate
* large volume sizes on 32-bit machines. */
@@ -99,6 +100,7 @@ struct ceph_mount_options {
char *server_path; /* default NULL (means "/") */
char *fscache_uniq; /* default NULL */
char *mon_addr;
+ struct fscrypt_dummy_policy dummy_enc_policy;
};
/* mount state */
@@ -154,9 +156,11 @@ struct ceph_fs_client {
#ifdef CONFIG_CEPH_FSCACHE
struct fscache_volume *fscache;
#endif
+#ifdef CONFIG_FS_ENCRYPTION
+ struct fscrypt_dummy_policy fsc_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
@@ -1124,6 +1128,9 @@ struct ceph_acl_sec_ctx {
void *sec_ctx;
u32 sec_ctxlen;
#endif
+#ifdef CONFIG_FS_ENCRYPTION
+ struct ceph_fscrypt_auth *fscrypt_auth;
+#endif
struct ceph_pagelist *pagelist;
};
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -1403,6 +1403,9 @@ void ceph_release_acl_sec_ctx(struct cep
#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);
}