From e86281e700cca8a773f9a572fa406adf2784ba5c Mon Sep 17 00:00:00 2001 From: Tyler Hicks Date: Wed, 28 Mar 2018 23:41:52 +0000 Subject: [PATCH] eCryptfs: don't pass up plaintext names when using filename encryption Both ecryptfs_filldir() and ecryptfs_readlink_lower() use ecryptfs_decode_and_decrypt_filename() to translate lower filenames to upper filenames. The function correctly passes up lower filenames, unchanged, when filename encryption isn't in use. However, it was also passing up lower filenames when the filename wasn't encrypted or when decryption failed. Since 88ae4ab9802e, eCryptfs refuses to lookup lower plaintext names when filename encryption is enabled so this resulted in a situation where userspace would see lower plaintext filenames in calls to getdents(2) but then not be able to lookup those filenames. An example of this can be seen when enabling filename encryption on an eCryptfs mount at the root directory of an Ext4 filesystem: $ ls -1i /lower 12 ECRYPTFS_FNEK_ENCRYPTED.FWYZD8TcW.5FV-TKTEYOHsheiHX9a-w.NURCCYIMjI8pn5BDB9-h3fXwrE-- 11 lost+found $ ls -1i /upper ls: cannot access '/upper/lost+found': No such file or directory ? lost+found 12 test With this change, the lower lost+found dentry is ignored: $ ls -1i /lower 12 ECRYPTFS_FNEK_ENCRYPTED.FWYZD8TcW.5FV-TKTEYOHsheiHX9a-w.NURCCYIMjI8pn5BDB9-h3fXwrE-- 11 lost+found $ ls -1i /upper 12 test Additionally, some potentially noisy error/info messages in the related code paths are turned into debug messages so that the logs can't be easily filled. Fixes: 88ae4ab9802e ("ecryptfs_lookup(): try either only encrypted or plaintext name") Reported-by: Guenter Roeck Cc: Al Viro Signed-off-by: Tyler Hicks --- fs/ecryptfs/crypto.c | 41 ++++++++++++++++++++++++++++------------- fs/ecryptfs/file.c | 21 ++++++++++++++++----- 2 files changed, 44 insertions(+), 18 deletions(-) diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c index 846ca150d52e..4dd842f72846 100644 --- a/fs/ecryptfs/crypto.c +++ b/fs/ecryptfs/crypto.c @@ -1997,6 +1997,16 @@ out: return rc; } +static bool is_dot_dotdot(const char *name, size_t name_size) +{ + if (name_size == 1 && name[0] == '.') + return true; + else if (name_size == 2 && name[0] == '.' && name[1] == '.') + return true; + + return false; +} + /** * ecryptfs_decode_and_decrypt_filename - converts the encoded cipher text name to decoded plaintext * @plaintext_name: The plaintext name @@ -2021,13 +2031,21 @@ int ecryptfs_decode_and_decrypt_filename(char **plaintext_name, size_t packet_size; int rc = 0; - if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) - && !(mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) - && (name_size > ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE) - && (strncmp(name, ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX, - ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE) == 0)) { - const char *orig_name = name; - size_t orig_name_size = name_size; + if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) && + !(mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)) { + if (is_dot_dotdot(name, name_size)) { + rc = ecryptfs_copy_filename(plaintext_name, + plaintext_name_size, + name, name_size); + goto out; + } + + if (name_size <= ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE || + strncmp(name, ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX, + ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE)) { + rc = -EINVAL; + goto out; + } name += ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE; name_size -= ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE; @@ -2047,12 +2065,9 @@ int ecryptfs_decode_and_decrypt_filename(char **plaintext_name, decoded_name, decoded_name_size); if (rc) { - printk(KERN_INFO "%s: Could not parse tag 70 packet " - "from filename; copying through filename " - "as-is\n", __func__); - rc = ecryptfs_copy_filename(plaintext_name, - plaintext_name_size, - orig_name, orig_name_size); + ecryptfs_printk(KERN_DEBUG, + "%s: Could not parse tag 70 packet from filename\n", + __func__); goto out_free; } } else { diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c index c74ed3ca3372..b76a9853325e 100644 --- a/fs/ecryptfs/file.c +++ b/fs/ecryptfs/file.c @@ -82,17 +82,28 @@ ecryptfs_filldir(struct dir_context *ctx, const char *lower_name, buf->sb, lower_name, lower_namelen); if (rc) { - printk(KERN_ERR "%s: Error attempting to decode and decrypt " - "filename [%s]; rc = [%d]\n", __func__, lower_name, - rc); - goto out; + if (rc != -EINVAL) { + ecryptfs_printk(KERN_DEBUG, + "%s: Error attempting to decode and decrypt filename [%s]; rc = [%d]\n", + __func__, lower_name, rc); + return rc; + } + + /* Mask -EINVAL errors as these are most likely due a plaintext + * filename present in the lower filesystem despite filename + * encryption being enabled. One unavoidable example would be + * the "lost+found" dentry in the root directory of an Ext4 + * filesystem. + */ + return 0; } + buf->caller->pos = buf->ctx.pos; rc = !dir_emit(buf->caller, name, name_size, ino, d_type); kfree(name); if (!rc) buf->entries_written++; -out: + return rc; } -- 2.30.2