For ceph, we want to use our own scheme for handling filenames that are
are longer than NAME_MAX after encryption and base64 encoding. This
allows us to have a consistent view of the encrypted filenames for
clients that don't support fscrypt and clients that do but that don't
have the key.
Currently, fs/crypto only supports encrypting filenames using
fscrypt_setup_filename, but that also handles encoding nokey names. Ceph
can't use that because it handles nokey names in a different way.
Export fscrypt_fname_encrypt. Rename fscrypt_fname_encrypted_size to
__fscrypt_fname_encrypted_size and add a new wrapper called
fscrypt_fname_encrypted_size that takes an inode argument rather than a
pointer to a fscrypt_policy union.
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
fs/crypto/fname.c | 32 +++++++++++++++++++++++++++-----
fs/crypto/fscrypt_private.h | 9 +++------
fs/crypto/hooks.c | 6 +++---
include/linux/fscrypt.h | 4 ++++
4 files changed, 37 insertions(+), 14 deletions(-)
diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c
index 02555a31875a..7195b64aea77 100644
--- a/fs/crypto/fname.c
+++ b/fs/crypto/fname.c
@@ -130,6 +130,7 @@ int fscrypt_fname_encrypt(const struct inode *inode, const struct qstr *iname,
return 0;
}
+EXPORT_SYMBOL(fscrypt_fname_encrypt);
/**
* fname_decrypt() - decrypt a filename
@@ -257,9 +258,9 @@ int fscrypt_base64url_decode(const char *src, int srclen, u8 *dst)
}
EXPORT_SYMBOL(fscrypt_base64url_decode);
-bool fscrypt_fname_encrypted_size(const union fscrypt_policy *policy,
- u32 orig_len, u32 max_len,
- u32 *encrypted_len_ret)
+bool __fscrypt_fname_encrypted_size(const union fscrypt_policy *policy,
+ u32 orig_len, u32 max_len,
+ u32 *encrypted_len_ret)
{
int padding = 4 << (fscrypt_policy_flags(policy) &
FSCRYPT_POLICY_FLAGS_PAD_MASK);
@@ -273,6 +274,28 @@ bool fscrypt_fname_encrypted_size(const union fscrypt_policy *policy,
return true;
}
+/**
+ * fscrypt_fname_encrypted_size() - calculate length of encrypted filename
+ * @inode: parent inode of dentry name being encrypted
+ * @orig_len: length of the original filename
+ * @max_len: maximum length to return
+ * @encrypted_len_ret: where calculated length should be returned (on success)
+ *
+ * Filenames must be padded out to at least the end of an fscrypt block before
+ * encrypting them. This calculates the length of an encrypted filename.
+ *
+ * Return: false if the orig_len is shorter than max_len. Otherwise, true and
+ * fill out encrypted_len_ret with the length (up to max_len).
+ */
+bool fscrypt_fname_encrypted_size(const struct inode *inode, u32 orig_len,
+ u32 max_len, u32 *encrypted_len_ret)
+{
+ return __fscrypt_fname_encrypted_size(&inode->i_crypt_info->ci_policy,
+ orig_len, max_len,
+ encrypted_len_ret);
+}
+EXPORT_SYMBOL(fscrypt_fname_encrypted_size);
+
/**
* fscrypt_fname_alloc_buffer() - allocate a buffer for presented filenames
* @max_encrypted_len: maximum length of encrypted filenames the buffer will be
@@ -428,8 +451,7 @@ int fscrypt_setup_filename(struct inode *dir, const struct qstr *iname,
return ret;
if (fscrypt_has_encryption_key(dir)) {
- if (!fscrypt_fname_encrypted_size(&dir->i_crypt_info->ci_policy,
- iname->len,
+ if (!fscrypt_fname_encrypted_size(dir, iname->len,
dir->i_sb->s_cop->max_namelen,
&fname->crypto_buf.len))
return -ENAMETOOLONG;
diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h
index 3fa965eb3336..195de6d0db40 100644
--- a/fs/crypto/fscrypt_private.h
+++ b/fs/crypto/fscrypt_private.h
@@ -292,14 +292,11 @@ void fscrypt_generate_iv(union fscrypt_iv *iv, u64 lblk_num,
const struct fscrypt_info *ci);
/* fname.c */
-int fscrypt_fname_encrypt(const struct inode *inode, const struct qstr *iname,
- u8 *out, unsigned int olen);
-bool fscrypt_fname_encrypted_size(const union fscrypt_policy *policy,
- u32 orig_len, u32 max_len,
- u32 *encrypted_len_ret);
+bool __fscrypt_fname_encrypted_size(const union fscrypt_policy *policy,
+ u32 orig_len, u32 max_len,
+ u32 *encrypted_len_ret);
/* hkdf.c */
-
struct fscrypt_hkdf {
struct crypto_shash *hmac_tfm;
};
diff --git a/fs/crypto/hooks.c b/fs/crypto/hooks.c
index a73b0376e6f3..e65c19aae041 100644
--- a/fs/crypto/hooks.c
+++ b/fs/crypto/hooks.c
@@ -228,9 +228,9 @@ int fscrypt_prepare_symlink(struct inode *dir, const char *target,
* counting it (even though it is meaningless for ciphertext) is simpler
* for now since filesystems will assume it is there and subtract it.
*/
- if (!fscrypt_fname_encrypted_size(policy, len,
- max_len - sizeof(struct fscrypt_symlink_data),
- &disk_link->len))
+ if (!__fscrypt_fname_encrypted_size(policy, len,
+ max_len - sizeof(struct fscrypt_symlink_data),
+ &disk_link->len))
return -ENAMETOOLONG;
disk_link->len += sizeof(struct fscrypt_symlink_data);
diff --git a/include/linux/fscrypt.h b/include/linux/fscrypt.h
index 07144330f975..64281ba4be2b 100644
--- a/include/linux/fscrypt.h
+++ b/include/linux/fscrypt.h
@@ -210,8 +210,12 @@ void fscrypt_free_inode(struct inode *inode);
int fscrypt_drop_inode(struct inode *inode);
/* fname.c */
+int fscrypt_fname_encrypt(const struct inode *inode, const struct qstr *iname,
+ u8 *out, unsigned int olen);
int fscrypt_base64url_encode(const u8 *src, int len, char *dst);
int fscrypt_base64url_decode(const char *src, int len, u8 *dst);
+bool fscrypt_fname_encrypted_size(const struct inode *inode, u32 orig_len,
+ u32 max_len, u32 *encrypted_len_ret);
int fscrypt_setup_filename(struct inode *inode, const struct qstr *iname,
int lookup, struct fscrypt_name *fname);
--
2.31.1
