[RFC,v3,03/18] fscrypt: use FSCRYPT_* definitions, not FS_*

Message ID	20190220065249.32099-4-ebiggers@kernel.org (mailing list archive)
State	Superseded
Headers	show Return-Path: <linux-fscrypt-owner@kernel.org> From: Eric Biggers <ebiggers@kernel.org> To: linux-fscrypt@vger.kernel.org Cc: Satya Tangirala <satyat@google.com>, linux-api@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, keyrings@vger.kernel.org, linux-mtd@lists.infradead.org, linux-crypto@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, Paul Crowley <paulcrowley@google.com> Subject: [RFC PATCH v3 03/18] fscrypt: use FSCRYPT_* definitions, not FS_* Date: Tue, 19 Feb 2019 22:52:34 -0800 Message-Id: <20190220065249.32099-4-ebiggers@kernel.org> In-Reply-To: <20190220065249.32099-1-ebiggers@kernel.org> References: <20190220065249.32099-1-ebiggers@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-fscrypt-owner@vger.kernel.org Precedence: bulk
Series	fscrypt: key management improvements \| expand [RFC,v3,00/18] fscrypt: key management improvements [RFC,v3,01/18] fs, fscrypt: move uapi definitions to new header <linux/fscrypt.h> [RFC,v3,02/18] fscrypt: use FSCRYPT_ prefix for uapi constants [RFC,v3,03/18] fscrypt: use FSCRYPT_* definitions, not FS_* [RFC,v3,04/18] fs: add ->s_master_keys to struct super_block [RFC,v3,05/18] fscrypt: add ->ci_inode to fscrypt_info [RFC,v3,06/18] fscrypt: refactor v1 policy key setup into keysetup_legacy.c [RFC,v3,07/18] fscrypt: add FS_IOC_ADD_ENCRYPTION_KEY ioctl [RFC,v3,08/18] fs/dcache.c: add shrink_dcache_inode() [RFC,v3,09/18] fscrypt: add FS_IOC_REMOVE_ENCRYPTION_KEY ioctl [RFC,v3,10/18] fscrypt: add FS_IOC_GET_ENCRYPTION_KEY_STATUS ioctl [RFC,v3,11/18] fscrypt: add an HKDF-SHA512 implementation [RFC,v3,12/18] fscrypt: v2 encryption policy support [RFC,v3,13/18] fscrypt: allow unprivileged users to add/remove keys for v2 policies [RFC,v3,14/18] fscrypt: require that key be added when setting a v2 encryption policy [RFC,v3,15/18] ext4: wire up new fscrypt ioctls [RFC,v3,16/18] f2fs: wire up new fscrypt ioctls [RFC,v3,17/18] ubifs: wire up new fscrypt ioctls [RFC,v3,18/18] fscrypt: document the new ioctls and policy version

diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c index 4dc788e3bc96..8217a4434621 100644 --- a/fs/crypto/crypto.c +++ b/fs/crypto/crypto.c @@ -139,7 +139,7 @@ void fscrypt_generate_iv(union fscrypt_iv *iv, u64 lblk_num, memset(iv, 0, ci->ci_mode->ivsize); iv->lblk_num = cpu_to_le64(lblk_num); - if (ci->ci_flags & FS_POLICY_FLAG_DIRECT_KEY) + if (ci->ci_flags & FSCRYPT_POLICY_FLAG_DIRECT_KEY) memcpy(iv->nonce, ci->ci_nonce, FS_KEY_DERIVATION_NONCE_SIZE); if (ci->ci_essiv_tfm != NULL) diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c index 7ff40a73dbec..37c26ad36d0e 100644 --- a/fs/crypto/fname.c +++ b/fs/crypto/fname.c @@ -187,7 +187,7 @@ bool fscrypt_fname_encrypted_size(const struct inode *inode, u32 orig_len, u32 max_len, u32 *encrypted_len_ret) { int padding = 4 << (inode->i_crypt_info->ci_flags & - FS_POLICY_FLAGS_PAD_MASK); + FSCRYPT_POLICY_FLAGS_PAD_MASK); u32 encrypted_len; if (orig_len > max_len) diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h index 7da276159593..52e09ef40bfa 100644 --- a/fs/crypto/fscrypt_private.h +++ b/fs/crypto/fscrypt_private.h @@ -34,7 +34,7 @@ struct fscrypt_context { u8 contents_encryption_mode; u8 filenames_encryption_mode; u8 flags; - u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE]; + u8 master_key_descriptor[FSCRYPT_KEY_DESCRIPTOR_SIZE]; u8 nonce[FS_KEY_DERIVATION_NONCE_SIZE]; } __packed; @@ -84,7 +84,7 @@ struct fscrypt_info { u8 ci_data_mode; u8 ci_filename_mode; u8 ci_flags; - u8 ci_master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE]; + u8 ci_master_key_descriptor[FSCRYPT_KEY_DESCRIPTOR_SIZE]; u8 ci_nonce[FS_KEY_DERIVATION_NONCE_SIZE]; }; @@ -99,16 +99,16 @@ typedef enum { static inline bool fscrypt_valid_enc_modes(u32 contents_mode, u32 filenames_mode) { - if (contents_mode == FS_ENCRYPTION_MODE_AES_128_CBC && - filenames_mode == FS_ENCRYPTION_MODE_AES_128_CTS) + if (contents_mode == FSCRYPT_MODE_AES_128_CBC && + filenames_mode == FSCRYPT_MODE_AES_128_CTS) return true; - if (contents_mode == FS_ENCRYPTION_MODE_AES_256_XTS && - filenames_mode == FS_ENCRYPTION_MODE_AES_256_CTS) + if (contents_mode == FSCRYPT_MODE_AES_256_XTS && + filenames_mode == FSCRYPT_MODE_AES_256_CTS) return true; - if (contents_mode == FS_ENCRYPTION_MODE_ADIANTUM && - filenames_mode == FS_ENCRYPTION_MODE_ADIANTUM) + if (contents_mode == FSCRYPT_MODE_ADIANTUM && + filenames_mode == FSCRYPT_MODE_ADIANTUM) return true; return false; diff --git a/fs/crypto/keyinfo.c b/fs/crypto/keyinfo.c index 1e11a683f63d..a8c1e886b0bc 100644 --- a/fs/crypto/keyinfo.c +++ b/fs/crypto/keyinfo.c @@ -21,7 +21,7 @@ static struct crypto_shash *essiv_hash_tfm; -/* Table of keys referenced by FS_POLICY_FLAG_DIRECT_KEY policies */ +/* Table of keys referenced by DIRECT_KEY policies */ static DEFINE_HASHTABLE(fscrypt_master_keys, 6); /* 6 bits = 64 buckets */ static DEFINE_SPINLOCK(fscrypt_master_keys_lock); @@ -78,7 +78,7 @@ static int derive_key_aes(const u8 *master_key, */ static struct key * find_and_lock_process_key(const char *prefix, - const u8 descriptor[FS_KEY_DESCRIPTOR_SIZE], + const u8 descriptor[FSCRYPT_KEY_DESCRIPTOR_SIZE], unsigned int min_keysize, const struct fscrypt_key **payload_ret) { @@ -88,7 +88,7 @@ find_and_lock_process_key(const char *prefix, const struct fscrypt_key *payload; description = kasprintf(GFP_NOFS, "%s%*phN", prefix, - FS_KEY_DESCRIPTOR_SIZE, descriptor); + FSCRYPT_KEY_DESCRIPTOR_SIZE, descriptor); if (!description) return ERR_PTR(-ENOMEM); @@ -106,7 +106,7 @@ find_and_lock_process_key(const char *prefix, payload = (const struct fscrypt_key *)ukp->data; if (ukp->datalen != sizeof(struct fscrypt_key) || - payload->size < 1 || payload->size > FS_MAX_KEY_SIZE) { + payload->size < 1 || payload->size > FSCRYPT_MAX_KEY_SIZE) { fscrypt_warn(NULL, "key with description '%s' has invalid payload", key->description); @@ -130,32 +130,32 @@ find_and_lock_process_key(const char *prefix, } static struct fscrypt_mode available_modes[] = { - [FS_ENCRYPTION_MODE_AES_256_XTS] = { + [FSCRYPT_MODE_AES_256_XTS] = { .friendly_name = "AES-256-XTS", .cipher_str = "xts(aes)", .keysize = 64, .ivsize = 16, }, - [FS_ENCRYPTION_MODE_AES_256_CTS] = { + [FSCRYPT_MODE_AES_256_CTS] = { .friendly_name = "AES-256-CTS-CBC", .cipher_str = "cts(cbc(aes))", .keysize = 32, .ivsize = 16, }, - [FS_ENCRYPTION_MODE_AES_128_CBC] = { + [FSCRYPT_MODE_AES_128_CBC] = { .friendly_name = "AES-128-CBC", .cipher_str = "cbc(aes)", .keysize = 16, .ivsize = 16, .needs_essiv = true, }, - [FS_ENCRYPTION_MODE_AES_128_CTS] = { + [FSCRYPT_MODE_AES_128_CTS] = { .friendly_name = "AES-128-CTS-CBC", .cipher_str = "cts(cbc(aes))", .keysize = 16, .ivsize = 16, }, - [FS_ENCRYPTION_MODE_ADIANTUM] = { + [FSCRYPT_MODE_ADIANTUM] = { .friendly_name = "Adiantum", .cipher_str = "adiantum(xchacha12,aes)", .keysize = 32, @@ -194,7 +194,7 @@ static int find_and_derive_key(const struct inode *inode, const struct fscrypt_key *payload; int err; - key = find_and_lock_process_key(FS_KEY_DESC_PREFIX, + key = find_and_lock_process_key(FSCRYPT_KEY_DESC_PREFIX, ctx->master_key_descriptor, mode->keysize, &payload); if (key == ERR_PTR(-ENOKEY) && inode->i_sb->s_cop->key_prefix) { @@ -205,7 +205,7 @@ static int find_and_derive_key(const struct inode *inode, if (IS_ERR(key)) return PTR_ERR(key); - if (ctx->flags & FS_POLICY_FLAG_DIRECT_KEY) { + if (ctx->flags & FSCRYPT_POLICY_FLAG_DIRECT_KEY) { if (mode->ivsize < offsetofend(union fscrypt_iv, nonce)) { fscrypt_warn(inode->i_sb, "direct key mode not allowed with %s", @@ -269,14 +269,14 @@ allocate_skcipher_for_mode(struct fscrypt_mode *mode, const u8 *raw_key, return ERR_PTR(err); } -/* Master key referenced by FS_POLICY_FLAG_DIRECT_KEY policy */ +/* Master key referenced by DIRECT_KEY policy */ struct fscrypt_master_key { struct hlist_node mk_node; refcount_t mk_refcount; const struct fscrypt_mode *mk_mode; struct crypto_skcipher *mk_ctfm; - u8 mk_descriptor[FS_KEY_DESCRIPTOR_SIZE]; - u8 mk_raw[FS_MAX_KEY_SIZE]; + u8 mk_descriptor[FSCRYPT_KEY_DESCRIPTOR_SIZE]; + u8 mk_raw[FSCRYPT_MAX_KEY_SIZE]; }; static void free_master_key(struct fscrypt_master_key *mk) @@ -317,13 +317,13 @@ find_or_insert_master_key(struct fscrypt_master_key *to_insert, * raw key, and use crypto_memneq() when comparing raw keys. */ - BUILD_BUG_ON(sizeof(hash_key) > FS_KEY_DESCRIPTOR_SIZE); + BUILD_BUG_ON(sizeof(hash_key) > FSCRYPT_KEY_DESCRIPTOR_SIZE); memcpy(&hash_key, ci->ci_master_key_descriptor, sizeof(hash_key)); spin_lock(&fscrypt_master_keys_lock); hash_for_each_possible(fscrypt_master_keys, mk, mk_node, hash_key) { if (memcmp(ci->ci_master_key_descriptor, mk->mk_descriptor, - FS_KEY_DESCRIPTOR_SIZE) != 0) + FSCRYPT_KEY_DESCRIPTOR_SIZE) != 0) continue; if (mode != mk->mk_mode) continue; @@ -367,7 +367,7 @@ fscrypt_get_master_key(const struct fscrypt_info *ci, struct fscrypt_mode *mode, goto err_free_mk; } memcpy(mk->mk_descriptor, ci->ci_master_key_descriptor, - FS_KEY_DESCRIPTOR_SIZE); + FSCRYPT_KEY_DESCRIPTOR_SIZE); memcpy(mk->mk_raw, raw_key, mode->keysize); return find_or_insert_master_key(mk, raw_key, mode, ci); @@ -446,8 +446,8 @@ void __exit fscrypt_essiv_cleanup(void) /* * Given the encryption mode and key (normally the derived key, but for - * FS_POLICY_FLAG_DIRECT_KEY mode it's the master key), set up the inode's - * symmetric cipher transform object(s). + * DIRECT_KEY mode it's the master key), set up the inode's symmetric cipher + * transform object(s). */ static int setup_crypto_transform(struct fscrypt_info *ci, struct fscrypt_mode *mode, @@ -457,7 +457,7 @@ static int setup_crypto_transform(struct fscrypt_info *ci, struct crypto_skcipher *ctfm; int err; - if (ci->ci_flags & FS_POLICY_FLAG_DIRECT_KEY) { + if (ci->ci_flags & FSCRYPT_POLICY_FLAG_DIRECT_KEY) { mk = fscrypt_get_master_key(ci, mode, raw_key, inode); if (IS_ERR(mk)) return PTR_ERR(mk); @@ -474,7 +474,7 @@ static int setup_crypto_transform(struct fscrypt_info *ci, if (mode->needs_essiv) { /* ESSIV implies 16-byte IVs which implies !DIRECT_KEY */ WARN_ON(mode->ivsize != AES_BLOCK_SIZE); - WARN_ON(ci->ci_flags & FS_POLICY_FLAG_DIRECT_KEY); + WARN_ON(ci->ci_flags & FSCRYPT_POLICY_FLAG_DIRECT_KEY); err = init_essiv_generator(ci, raw_key, mode->keysize); if (err) { @@ -524,9 +524,10 @@ int fscrypt_get_encryption_info(struct inode *inode) /* Fake up a context for an unencrypted directory */ memset(&ctx, 0, sizeof(ctx)); ctx.format = FS_ENCRYPTION_CONTEXT_FORMAT_V1; - ctx.contents_encryption_mode = FS_ENCRYPTION_MODE_AES_256_XTS; - ctx.filenames_encryption_mode = FS_ENCRYPTION_MODE_AES_256_CTS; - memset(ctx.master_key_descriptor, 0x42, FS_KEY_DESCRIPTOR_SIZE); + ctx.contents_encryption_mode = FSCRYPT_MODE_AES_256_XTS; + ctx.filenames_encryption_mode = FSCRYPT_MODE_AES_256_CTS; + memset(ctx.master_key_descriptor, 0x42, + FSCRYPT_KEY_DESCRIPTOR_SIZE); } else if (res != sizeof(ctx)) { return -EINVAL; } @@ -534,7 +535,7 @@ int fscrypt_get_encryption_info(struct inode *inode) if (ctx.format != FS_ENCRYPTION_CONTEXT_FORMAT_V1) return -EINVAL; - if (ctx.flags & ~FS_POLICY_FLAGS_VALID) + if (ctx.flags & ~FSCRYPT_POLICY_FLAGS_VALID) return -EINVAL; crypt_info = kmem_cache_zalloc(fscrypt_info_cachep, GFP_NOFS); @@ -545,7 +546,7 @@ int fscrypt_get_encryption_info(struct inode *inode) crypt_info->ci_data_mode = ctx.contents_encryption_mode; crypt_info->ci_filename_mode = ctx.filenames_encryption_mode; memcpy(crypt_info->ci_master_key_descriptor, ctx.master_key_descriptor, - FS_KEY_DESCRIPTOR_SIZE); + FSCRYPT_KEY_DESCRIPTOR_SIZE); memcpy(crypt_info->ci_nonce, ctx.nonce, FS_KEY_DERIVATION_NONCE_SIZE); mode = select_encryption_mode(crypt_info, inode); diff --git a/fs/crypto/policy.c b/fs/crypto/policy.c index bd7eaf9b3f00..1e0563cea1a5 100644 --- a/fs/crypto/policy.c +++ b/fs/crypto/policy.c @@ -22,7 +22,7 @@ static bool is_encryption_context_consistent_with_policy( const struct fscrypt_policy *policy) { return memcmp(ctx->master_key_descriptor, policy->master_key_descriptor, - FS_KEY_DESCRIPTOR_SIZE) == 0 && + FSCRYPT_KEY_DESCRIPTOR_SIZE) == 0 && (ctx->flags == policy->flags) && (ctx->contents_encryption_mode == policy->contents_encryption_mode) && @@ -37,13 +37,13 @@ static int create_encryption_context_from_policy(struct inode *inode, ctx.format = FS_ENCRYPTION_CONTEXT_FORMAT_V1; memcpy(ctx.master_key_descriptor, policy->master_key_descriptor, - FS_KEY_DESCRIPTOR_SIZE); + FSCRYPT_KEY_DESCRIPTOR_SIZE); if (!fscrypt_valid_enc_modes(policy->contents_encryption_mode, policy->filenames_encryption_mode)) return -EINVAL; - if (policy->flags & ~FS_POLICY_FLAGS_VALID) + if (policy->flags & ~FSCRYPT_POLICY_FLAGS_VALID) return -EINVAL; ctx.contents_encryption_mode = policy->contents_encryption_mode; @@ -126,7 +126,7 @@ int fscrypt_ioctl_get_policy(struct file *filp, void __user *arg) policy.filenames_encryption_mode = ctx.filenames_encryption_mode; policy.flags = ctx.flags; memcpy(policy.master_key_descriptor, ctx.master_key_descriptor, - FS_KEY_DESCRIPTOR_SIZE); + FSCRYPT_KEY_DESCRIPTOR_SIZE); if (copy_to_user(arg, &policy, sizeof(policy))) return -EFAULT; @@ -200,7 +200,7 @@ int fscrypt_has_permitted_context(struct inode *parent, struct inode *child) if (parent_ci && child_ci) { return memcmp(parent_ci->ci_master_key_descriptor, child_ci->ci_master_key_descriptor, - FS_KEY_DESCRIPTOR_SIZE) == 0 && + FSCRYPT_KEY_DESCRIPTOR_SIZE) == 0 && (parent_ci->ci_data_mode == child_ci->ci_data_mode) && (parent_ci->ci_filename_mode == child_ci->ci_filename_mode) && @@ -217,7 +217,7 @@ int fscrypt_has_permitted_context(struct inode *parent, struct inode *child) return memcmp(parent_ctx.master_key_descriptor, child_ctx.master_key_descriptor, - FS_KEY_DESCRIPTOR_SIZE) == 0 && + FSCRYPT_KEY_DESCRIPTOR_SIZE) == 0 && (parent_ctx.contents_encryption_mode == child_ctx.contents_encryption_mode) && (parent_ctx.filenames_encryption_mode == @@ -255,7 +255,7 @@ int fscrypt_inherit_context(struct inode *parent, struct inode *child, ctx.filenames_encryption_mode = ci->ci_filename_mode; ctx.flags = ci->ci_flags; memcpy(ctx.master_key_descriptor, ci->ci_master_key_descriptor, - FS_KEY_DESCRIPTOR_SIZE); + FSCRYPT_KEY_DESCRIPTOR_SIZE); get_random_bytes(ctx.nonce, FS_KEY_DERIVATION_NONCE_SIZE); BUILD_BUG_ON(sizeof(ctx) != FSCRYPT_SET_CONTEXT_MAX_SIZE); res = parent->i_sb->s_cop->set_context(child, &ctx, diff --git a/include/uapi/linux/fscrypt.h b/include/uapi/linux/fscrypt.h index f9b99cc028bc..3bbc5dfbde21 100644 --- a/include/uapi/linux/fscrypt.h +++ b/include/uapi/linux/fscrypt.h @@ -53,6 +53,7 @@ struct fscrypt_key { /**********************************************************************/ /* old names; don't add anything new here! */ +#ifndef __KERNEL__ #define FS_KEY_DESCRIPTOR_SIZE FSCRYPT_KEY_DESCRIPTOR_SIZE #define FS_POLICY_FLAGS_PAD_4 FSCRYPT_POLICY_FLAGS_PAD_4 #define FS_POLICY_FLAGS_PAD_8 FSCRYPT_POLICY_FLAGS_PAD_8 @@ -74,5 +75,6 @@ struct fscrypt_key { #define FS_KEY_DESC_PREFIX FSCRYPT_KEY_DESC_PREFIX #define FS_KEY_DESC_PREFIX_SIZE FSCRYPT_KEY_DESC_PREFIX_SIZE #define FS_MAX_KEY_SIZE FSCRYPT_MAX_KEY_SIZE +#endif /* !__KERNEL__ */ #endif /* _UAPI_LINUX_FSCRYPT_H */

[RFC,v3,03/18] fscrypt: use FSCRYPT_* definitions, not FS_*

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