From patchwork Thu Nov 7 00:12:59 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 11231387 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8365915AB for ; Thu, 7 Nov 2019 00:19:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1181A21882 for ; Thu, 7 Nov 2019 00:19:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573085977; bh=YMDTgdOflPLgJH1D35yGz6DRx3cfarYpAjq/z5+q5ZY=; h=From:To:Cc:Subject:Date:List-ID:From; b=N0lTRtQd0e7brHdUwhUz8w9QU0cl5CjX64q62gZHY+qxsmBqTT8K24W7mHoqa2oQy Aa5fWlbxFB9OVBJ7gt1Zuc0Ghv6j0l4BdWZvDR+WoApS6g3+6vdQa+ERYlIa5x3Hk1 J/LRv2G54wG47MJo7uBlH4lKUal77ZVVY3KcMHT0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728817AbfKGATg (ORCPT ); Wed, 6 Nov 2019 19:19:36 -0500 Received: from mail.kernel.org ([198.145.29.99]:55814 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727228AbfKGATe (ORCPT ); Wed, 6 Nov 2019 19:19:34 -0500 Received: from ebiggers-linuxstation.mtv.corp.google.com (unknown [104.132.1.77]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5CE81206DF; Thu, 7 Nov 2019 00:19:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573085972; bh=YMDTgdOflPLgJH1D35yGz6DRx3cfarYpAjq/z5+q5ZY=; h=From:To:Cc:Subject:Date:From; b=DQIJcGP+LSfuhVVczRlJY5IFRxLt7y1XfBaVPp9PWkIfH23ZkM3Csu/WUafZB3tg/ s0nGK6pYbhV67rO1S60HRGNdcKH/CTBo/fSJSrNTprRdOyU5QM7mEN7dvvoBaP+JCk tIQjkCVFcqt0mo5PDR8Z1Eq40DBL2aKUp2CFuh/o= From: Eric Biggers To: linux-fscrypt@vger.kernel.org Cc: "Theodore Y . Ts'o" , Jaegeuk Kim , Paul Crowley , Paul Lawrence , keyrings@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-mtd@lists.infradead.org, David Howells , Jarkko Sakkinen , Ondrej Mosnacek , Ondrej Kozina Subject: [PATCH] fscrypt: support passing a keyring key to FS_IOC_ADD_ENCRYPTION_KEY Date: Wed, 6 Nov 2019 16:12:59 -0800 Message-Id: <20191107001259.115018-1-ebiggers@kernel.org> X-Mailer: git-send-email 2.24.0.rc1.363.gb1bccd3e3d-goog MIME-Version: 1.0 Sender: linux-fscrypt-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fscrypt@vger.kernel.org From: Eric Biggers Extend the FS_IOC_ADD_ENCRYPTION_KEY ioctl to allow the raw key to be specified by a Linux keyring key, rather than specified directly. This is useful because fscrypt keys belong to a particular filesystem instance, so they are destroyed when that filesystem is unmounted. Usually this is desired. But in some cases, userspace may need to unmount and re-mount the filesystem while keeping the keys, e.g. during a system update. This requires keeping the keys somewhere else too. The keys could be kept in memory in a userspace daemon. But depending on the security architecture and assumptions, it can be preferable to keep them only in kernel memory, where they are unreadable by userspace. We also can't solve this by going back to the original fscrypt API (where for each file, the master key was looked up in the process's keyring hierarchy) because that caused lots of problems of its own. Therefore, add the ability for FS_IOC_ADD_ENCRYPTION_KEY to accept a Linux keyring key. This solves the problem by allowing userspace to (if needed) save the keys securely in a Linux keyring for re-provisioning, while still using the new fscrypt key management ioctls. This is analogous to how dm-crypt accepts a Linux keyring key, but the key is then stored internally in the dm-crypt data structures rather than being looked up again each time the dm-crypt device is accessed. Use a custom key type "fscrypt-provisioning" rather than one of the existing key types such as "logon". This is strongly desired because it enforces that these keys are only usable for a particular purpose: for fscrypt as input to a particular KDF. Otherwise, the keys could also be passed to any kernel API that accepts a "logon" key with any service prefix, e.g. dm-crypt, UBIFS, or (recently proposed) AF_ALG. This would risk leaking information about the raw key despite it ostensibly being unreadable. Of course, this mistake has already been made for multiple kernel APIs; but since this is a new API, let's do it right. Signed-off-by: Eric Biggers --- Documentation/filesystems/fscrypt.rst | 35 ++++++- fs/crypto/keyring.c | 126 ++++++++++++++++++++++++-- include/uapi/linux/fscrypt.h | 13 ++- 3 files changed, 162 insertions(+), 12 deletions(-) diff --git a/Documentation/filesystems/fscrypt.rst b/Documentation/filesystems/fscrypt.rst index 471a511c75088d..4d15dda36402e0 100644 --- a/Documentation/filesystems/fscrypt.rst +++ b/Documentation/filesystems/fscrypt.rst @@ -638,7 +638,8 @@ follows:: struct fscrypt_add_key_arg { struct fscrypt_key_specifier key_spec; __u32 raw_size; - __u32 __reserved[9]; + __u32 key_id; + __u32 __reserved[8]; __u8 raw[]; }; @@ -655,6 +656,12 @@ follows:: } u; }; + struct fscrypt_key_provisioning_payload { + __u32 type; + __u32 __reserved; + __u8 raw[]; + }; + :c:type:`struct fscrypt_add_key_arg` must be zeroed, then initialized as follows: @@ -677,9 +684,26 @@ as follows: ``Documentation/security/keys/core.rst``). - ``raw_size`` must be the size of the ``raw`` key provided, in bytes. + Alternatively, if ``key_id`` is nonzero, this field must be 0, since + in that case the size is implied by the specified Linux keyring key. + +- ``key_id`` is 0 if the raw key is given directly in the ``raw`` + field. Otherwise ``key_id`` is the ID of a Linux keyring key of + type "fscrypt-provisioning" whose payload is a ``struct + fscrypt_key_provisioning_payload`` whose ``raw`` field contains the + raw key and whose ``type`` field matches ``key_spec.type``. Since + ``raw`` is variable-length, the total size of this key's payload + must be ``sizeof(struct fscrypt_key_provisioning_payload)`` plus the + raw key size. The process must have Search permission on this key. + + Most users should leave this 0 and specify the raw key directly. + The support for specifying a Linux keyring key is intended mainly to + allow re-adding keys after a filesystem is unmounted and re-mounted, + without having to store the raw keys in userspace memory. - ``raw`` is a variable-length field which must contain the actual - key, ``raw_size`` bytes long. + key, ``raw_size`` bytes long. Alternatively, if ``key_id`` is + nonzero, then this field is unused. For v2 policy keys, the kernel keeps track of which user (identified by effective user ID) added the key, and only allows the key to be @@ -701,11 +725,16 @@ FS_IOC_ADD_ENCRYPTION_KEY can fail with the following errors: - ``EACCES``: FSCRYPT_KEY_SPEC_TYPE_DESCRIPTOR was specified, but the caller does not have the CAP_SYS_ADMIN capability in the initial - user namespace + user namespace; or the raw key was specified by Linux key ID but the + process lacks Search permission on the key. - ``EDQUOT``: the key quota for this user would be exceeded by adding the key - ``EINVAL``: invalid key size or key specifier type, or reserved bits were set +- ``EKEYREJECTED``: the raw key was specified by Linux key ID, but the + key has the wrong type +- ``ENOKEY``: the raw key was specified by Linux key ID, but no key + exists with that ID - ``ENOTTY``: this type of filesystem does not implement encryption - ``EOPNOTSUPP``: the kernel was not configured with encryption support for this filesystem, or the filesystem superblock has not diff --git a/fs/crypto/keyring.c b/fs/crypto/keyring.c index 040df1f5e1c8b1..ef5b171c0f1d64 100644 --- a/fs/crypto/keyring.c +++ b/fs/crypto/keyring.c @@ -465,6 +465,103 @@ static int add_master_key(struct super_block *sb, return err; } +static int fscrypt_provisioning_key_preparse(struct key_preparsed_payload *prep) +{ + const struct fscrypt_key_provisioning_payload *payload = prep->data; + + if (prep->datalen < sizeof(*payload) + FSCRYPT_MIN_KEY_SIZE || + prep->datalen > sizeof(*payload) + FSCRYPT_MAX_KEY_SIZE) + return -EINVAL; + if (payload->type != FSCRYPT_KEY_SPEC_TYPE_DESCRIPTOR && + payload->type != FSCRYPT_KEY_SPEC_TYPE_IDENTIFIER) + return -EINVAL; + if (payload->__reserved) + return -EINVAL; + prep->payload.data[0] = kmemdup(payload, prep->datalen, GFP_KERNEL); + if (!prep->payload.data[0]) + return -ENOMEM; + prep->quotalen = prep->datalen; + return 0; +} + +static void fscrypt_provisioning_key_free_preparse( + struct key_preparsed_payload *prep) +{ + kzfree(prep->payload.data[0]); +} + +static void fscrypt_provisioning_key_describe(const struct key *key, + struct seq_file *m) +{ + seq_puts(m, key->description); + if (key_is_positive(key)) { + const struct fscrypt_key_provisioning_payload *payload = + key->payload.data[0]; + + seq_printf(m, ": %u [%u]", key->datalen, payload->type); + } +} + +static void fscrypt_provisioning_key_destroy(struct key *key) +{ + kzfree(key->payload.data[0]); +} + +static struct key_type key_type_fscrypt_provisioning = { + .name = "fscrypt-provisioning", + .preparse = fscrypt_provisioning_key_preparse, + .free_preparse = fscrypt_provisioning_key_free_preparse, + .instantiate = generic_key_instantiate, + .describe = fscrypt_provisioning_key_describe, + .destroy = fscrypt_provisioning_key_destroy, +}; + +/* + * Retrieve the raw key from the Linux keyring key specified by 'key_id', and + * store it into 'secret'. + * + * The key must be of type "fscrypt-provisioning" and must have the field + * fscrypt_key_provisioning_payload::type set to 'type', indicating that it's + * only usable with fscrypt with the particular KDF version identified by + * 'type'. We don't use the "logon" key type because there's no way to + * completely restrict the use of such keys; they can be used by any kernel API + * that accepts "logon" keys and doesn't require a specific service prefix. + * + * The ability to specify the key via Linux keyring key is intended for cases + * where userspace needs to re-add keys after the filesystem is unmounted and + * re-mounted. Most users should just provide the raw key directly instead. + */ +static int get_keyring_key(u32 key_id, u32 type, + struct fscrypt_master_key_secret *secret) +{ + key_ref_t ref; + struct key *key; + const struct fscrypt_key_provisioning_payload *payload; + int err; + + ref = lookup_user_key(key_id, 0, KEY_NEED_SEARCH); + if (IS_ERR(ref)) + return PTR_ERR(ref); + key = key_ref_to_ptr(ref); + if (key->type != &key_type_fscrypt_provisioning) + goto bad_key; + payload = key->payload.data[0]; + + /* Don't allow fscrypt v1 keys to be used as v2 keys and vice versa. */ + if (payload->type != type) + goto bad_key; + + secret->size = key->datalen - sizeof(*payload); + memcpy(secret->raw, payload->raw, secret->size); + err = 0; + goto out_put; +bad_key: + err = -EKEYREJECTED; +out_put: + key_ref_put(ref); + return err; +} + /* * Add a master encryption key to the filesystem, causing all files which were * encrypted with it to appear "unlocked" (decrypted) when accessed. @@ -503,18 +600,25 @@ int fscrypt_ioctl_add_key(struct file *filp, void __user *_uarg) if (!valid_key_spec(&arg.key_spec)) return -EINVAL; - if (arg.raw_size < FSCRYPT_MIN_KEY_SIZE || - arg.raw_size > FSCRYPT_MAX_KEY_SIZE) - return -EINVAL; - if (memchr_inv(arg.__reserved, 0, sizeof(arg.__reserved))) return -EINVAL; memset(&secret, 0, sizeof(secret)); - secret.size = arg.raw_size; - err = -EFAULT; - if (copy_from_user(secret.raw, uarg->raw, secret.size)) - goto out_wipe_secret; + if (arg.key_id) { + if (arg.raw_size != 0) + return -EINVAL; + err = get_keyring_key(arg.key_id, arg.key_spec.type, &secret); + if (err) + goto out_wipe_secret; + } else { + if (arg.raw_size < FSCRYPT_MIN_KEY_SIZE || + arg.raw_size > FSCRYPT_MAX_KEY_SIZE) + return -EINVAL; + secret.size = arg.raw_size; + err = -EFAULT; + if (copy_from_user(secret.raw, uarg->raw, secret.size)) + goto out_wipe_secret; + } switch (arg.key_spec.type) { case FSCRYPT_KEY_SPEC_TYPE_DESCRIPTOR: @@ -978,8 +1082,14 @@ int __init fscrypt_init_keyring(void) if (err) goto err_unregister_fscrypt; + err = register_key_type(&key_type_fscrypt_provisioning); + if (err) + goto err_unregister_fscrypt_user; + return 0; +err_unregister_fscrypt_user: + unregister_key_type(&key_type_fscrypt_user); err_unregister_fscrypt: unregister_key_type(&key_type_fscrypt); return err; diff --git a/include/uapi/linux/fscrypt.h b/include/uapi/linux/fscrypt.h index 1beb174ad95056..605dde7343a4e4 100644 --- a/include/uapi/linux/fscrypt.h +++ b/include/uapi/linux/fscrypt.h @@ -109,11 +109,22 @@ struct fscrypt_key_specifier { } u; }; +/* + * Payload for Linux keyring key of type "fscrypt-provisioning", referenced by + * fscrypt_add_key_arg::key_id as an alternative to fscrypt_add_key_arg::raw. + */ +struct fscrypt_key_provisioning_payload { + __u32 type; + __u32 __reserved; + __u8 raw[]; +}; + /* Struct passed to FS_IOC_ADD_ENCRYPTION_KEY */ struct fscrypt_add_key_arg { struct fscrypt_key_specifier key_spec; __u32 raw_size; - __u32 __reserved[9]; + __u32 key_id; + __u32 __reserved[8]; __u8 raw[]; };