368 lines
11 KiB
C
368 lines
11 KiB
C
/*-
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* Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _G_ELI_H_
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#define _G_ELI_H_
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#include <sys/endian.h>
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#include <sys/errno.h>
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#include <sys/malloc.h>
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#include <crypto/sha2/sha2.h>
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#include <opencrypto/cryptodev.h>
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#ifdef _KERNEL
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#include <sys/bio.h>
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#include <sys/libkern.h>
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#include <geom/geom.h>
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#else
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#include <stdio.h>
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#include <string.h>
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#include <strings.h>
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#endif
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#ifndef _OpenSSL_
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#include <sys/md5.h>
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#endif
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#define G_ELI_CLASS_NAME "ELI"
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#define G_ELI_MAGIC "GEOM::ELI"
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#define G_ELI_SUFFIX ".eli"
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/*
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* Version history:
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* 0 - Initial version number.
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*/
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#define G_ELI_VERSION 0
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/* Use random, onetime keys. */
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#define G_ELI_FLAG_ONETIME 0x00000001
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/* Ask for the passphrase from the kernel, before mounting root. */
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#define G_ELI_FLAG_BOOT 0x00000002
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/* Detach on last close, if we were open for writing. */
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#define G_ELI_FLAG_WO_DETACH 0x00000004
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/* Detach on last close. */
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#define G_ELI_FLAG_RW_DETACH 0x00000008
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/* Provider was open for writing. */
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#define G_ELI_FLAG_WOPEN 0x00010000
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/* Destroy device. */
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#define G_ELI_FLAG_DESTROY 0x00020000
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#define SHA512_MDLEN 64
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#define G_ELI_MAXMKEYS 2
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#define G_ELI_MAXKEYLEN 64
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#define G_ELI_USERKEYLEN G_ELI_MAXKEYLEN
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#define G_ELI_DATAKEYLEN G_ELI_MAXKEYLEN
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#define G_ELI_IVKEYLEN G_ELI_MAXKEYLEN
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#define G_ELI_SALTLEN 64
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#define G_ELI_DATAIVKEYLEN (G_ELI_DATAKEYLEN + G_ELI_IVKEYLEN)
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/* Data-Key, IV-Key, HMAC_SHA512(Derived-Key, Data-Key+IV-Key) */
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#define G_ELI_MKEYLEN (G_ELI_DATAIVKEYLEN + SHA512_MDLEN)
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#ifdef _KERNEL
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extern u_int g_eli_debug;
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extern u_int g_eli_overwrites;
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#define G_ELI_CRYPTO_HW 1
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#define G_ELI_CRYPTO_SW 2
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#define G_ELI_DEBUG(lvl, ...) do { \
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if (g_eli_debug >= (lvl)) { \
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printf("GEOM_ELI"); \
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if (g_eli_debug > 0) \
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printf("[%u]", lvl); \
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printf(": "); \
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printf(__VA_ARGS__); \
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printf("\n"); \
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} \
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} while (0)
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#define G_ELI_LOGREQ(lvl, bp, ...) do { \
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if (g_eli_debug >= (lvl)) { \
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printf("GEOM_ELI"); \
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if (g_eli_debug > 0) \
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printf("[%u]", lvl); \
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printf(": "); \
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printf(__VA_ARGS__); \
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printf(" "); \
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g_print_bio(bp); \
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printf("\n"); \
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} \
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} while (0)
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struct g_eli_worker {
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struct g_eli_softc *w_softc;
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struct proc *w_proc;
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u_int w_number;
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uint64_t w_sid;
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LIST_ENTRY(g_eli_worker) w_next;
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};
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struct g_eli_softc {
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struct g_geom *sc_geom;
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u_int sc_crypto;
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uint8_t sc_datakey[G_ELI_DATAKEYLEN];
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uint8_t sc_ivkey[G_ELI_IVKEYLEN];
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SHA256_CTX sc_ivctx;
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u_int sc_algo;
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u_int sc_keylen;
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int sc_nkey;
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uint32_t sc_flags;
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/* Only for software cryptography. */
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struct bio_queue_head sc_queue;
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struct mtx sc_queue_mtx;
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LIST_HEAD(, g_eli_worker) sc_workers;
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};
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#define sc_name sc_geom->name
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#endif /* _KERNEL */
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struct g_eli_metadata {
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char md_magic[16]; /* Magic value. */
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uint32_t md_version; /* Version number. */
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uint32_t md_flags; /* Additional flags. */
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uint16_t md_algo; /* Encryption algorithm. */
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uint16_t md_keylen; /* Key length. */
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uint64_t md_provsize; /* Provider's size. */
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uint32_t md_sectorsize; /* Sector size. */
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uint8_t md_keys; /* Available keys. */
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int32_t md_iterations; /* Number of iterations for PKCS#5v2 */
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uint8_t md_salt[G_ELI_SALTLEN]; /* Salt. */
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/* Encrypted master key (IV-key, Data-key, HMAC). */
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uint8_t md_mkeys[G_ELI_MAXMKEYS * G_ELI_MKEYLEN];
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u_char md_hash[16]; /* MD5 hash. */
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};
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#ifndef _OpenSSL_
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static __inline void
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eli_metadata_encode(struct g_eli_metadata *md, u_char *data)
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{
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MD5_CTX ctx;
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u_char *p;
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p = data;
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bcopy(md->md_magic, p, sizeof(md->md_magic)); p += sizeof(md->md_magic);
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le32enc(p, md->md_version); p += sizeof(md->md_version);
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le32enc(p, md->md_flags); p += sizeof(md->md_flags);
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le16enc(p, md->md_algo); p += sizeof(md->md_algo);
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le16enc(p, md->md_keylen); p += sizeof(md->md_keylen);
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le64enc(p, md->md_provsize); p += sizeof(md->md_provsize);
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le32enc(p, md->md_sectorsize); p += sizeof(md->md_sectorsize);
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*p = md->md_keys; p += sizeof(md->md_keys);
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le32enc(p, md->md_iterations); p += sizeof(md->md_iterations);
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bcopy(md->md_salt, p, sizeof(md->md_salt)); p += sizeof(md->md_salt);
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bcopy(md->md_mkeys, p, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys);
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MD5Init(&ctx);
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MD5Update(&ctx, data, p - data);
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MD5Final(md->md_hash, &ctx);
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bcopy(md->md_hash, p, sizeof(md->md_hash));
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}
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static __inline int
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eli_metadata_decode_v0(const u_char *data, struct g_eli_metadata *md)
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{
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MD5_CTX ctx;
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const u_char *p;
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p = data + sizeof(md->md_magic) + sizeof(md->md_version);
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md->md_flags = le32dec(p); p += sizeof(md->md_flags);
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md->md_algo = le16dec(p); p += sizeof(md->md_algo);
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md->md_keylen = le16dec(p); p += sizeof(md->md_keylen);
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md->md_provsize = le64dec(p); p += sizeof(md->md_provsize);
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md->md_sectorsize = le32dec(p); p += sizeof(md->md_sectorsize);
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md->md_keys = *p; p += sizeof(md->md_keys);
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md->md_iterations = le32dec(p); p += sizeof(md->md_iterations);
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bcopy(p, md->md_salt, sizeof(md->md_salt)); p += sizeof(md->md_salt);
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bcopy(p, md->md_mkeys, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys);
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MD5Init(&ctx);
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MD5Update(&ctx, data, p - data);
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MD5Final(md->md_hash, &ctx);
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if (bcmp(md->md_hash, p, 16) != 0)
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return (EINVAL);
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return (0);
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}
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static __inline int
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eli_metadata_decode(const u_char *data, struct g_eli_metadata *md)
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{
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int error;
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bcopy(data, md->md_magic, sizeof(md->md_magic));
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md->md_version = le32dec(data + sizeof(md->md_magic));
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switch (md->md_version) {
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case 0:
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error = eli_metadata_decode_v0(data, md);
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break;
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default:
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error = EINVAL;
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break;
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}
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return (error);
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}
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#endif /* !_OpenSSL */
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static __inline u_int
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g_eli_str2algo(const char *name)
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{
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if (strcasecmp("null", name) == 0)
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return (CRYPTO_NULL_CBC);
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else if (strcasecmp("aes", name) == 0)
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return (CRYPTO_AES_CBC);
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else if (strcasecmp("blowfish", name) == 0)
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return (CRYPTO_BLF_CBC);
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else if (strcasecmp("3des", name) == 0)
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return (CRYPTO_3DES_CBC);
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return (CRYPTO_ALGORITHM_MIN - 1);
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}
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static __inline const char *
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g_eli_algo2str(u_int algo)
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{
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switch (algo) {
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case CRYPTO_NULL_CBC:
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return ("NULL");
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case CRYPTO_AES_CBC:
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return ("AES");
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case CRYPTO_BLF_CBC:
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return ("Blowfish");
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case CRYPTO_3DES_CBC:
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return ("3DES");
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}
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return ("unknown");
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}
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static __inline void
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eli_metadata_dump(const struct g_eli_metadata *md)
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{
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static const char hex[] = "0123456789abcdef";
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char str[sizeof(md->md_mkeys) * 2 + 1];
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u_int i;
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printf(" magic: %s\n", md->md_magic);
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printf(" version: %u\n", (u_int)md->md_version);
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printf(" flags: 0x%x\n", (u_int)md->md_flags);
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printf(" algo: %s\n", g_eli_algo2str(md->md_algo));
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printf(" keylen: %u\n", (u_int)md->md_keylen);
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printf(" provsize: %ju\n", (uintmax_t)md->md_provsize);
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printf("sectorsize: %u\n", (u_int)md->md_sectorsize);
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printf(" keys: 0x%02x\n", (u_int)md->md_keys);
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printf("iterations: %u\n", (u_int)md->md_iterations);
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bzero(str, sizeof(str));
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for (i = 0; i < sizeof(md->md_salt); i++) {
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str[i * 2] = hex[md->md_salt[i] >> 4];
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str[i * 2 + 1] = hex[md->md_salt[i] & 0x0f];
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}
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printf(" Salt: %s\n", str);
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bzero(str, sizeof(str));
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for (i = 0; i < sizeof(md->md_mkeys); i++) {
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str[i * 2] = hex[md->md_mkeys[i] >> 4];
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str[i * 2 + 1] = hex[md->md_mkeys[i] & 0x0f];
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}
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printf("Master Key: %s\n", str);
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bzero(str, sizeof(str));
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for (i = 0; i < 16; i++) {
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str[i * 2] = hex[md->md_hash[i] >> 4];
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str[i * 2 + 1] = hex[md->md_hash[i] & 0x0f];
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}
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printf(" MD5 hash: %s\n", str);
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}
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static __inline u_int
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g_eli_keylen(u_int algo, u_int keylen)
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{
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switch (algo) {
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case CRYPTO_NULL_CBC:
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if (keylen == 0)
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keylen = 64 * 8;
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else {
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if (keylen > 64 * 8)
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keylen = 0;
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}
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return (keylen);
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case CRYPTO_AES_CBC:
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switch (keylen) {
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case 0:
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return (128);
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case 128:
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case 192:
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case 256:
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return (keylen);
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default:
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return (0);
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}
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case CRYPTO_BLF_CBC:
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if (keylen == 0)
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return (128);
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if (keylen < 128 || keylen > 448)
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return (0);
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if ((keylen % 32) != 0)
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return (0);
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return (keylen);
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case CRYPTO_3DES_CBC:
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if (keylen == 0 || keylen == 192)
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return (192);
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return (0);
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default:
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return (0);
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}
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}
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#ifdef _KERNEL
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int g_eli_read_metadata(struct g_class *mp, struct g_provider *pp,
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struct g_eli_metadata *md);
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struct g_geom *g_eli_create(struct gctl_req *req, struct g_class *mp,
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struct g_provider *bpp, const struct g_eli_metadata *md,
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const u_char *mkey, int nkey);
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int g_eli_destroy(struct g_eli_softc *sc, boolean_t force);
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int g_eli_access(struct g_provider *pp, int dr, int dw, int de);
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void g_eli_config(struct gctl_req *req, struct g_class *mp, const char *verb);
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#endif
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void g_eli_mkey_hmac(unsigned char *mkey, const unsigned char *key);
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int g_eli_mkey_decrypt(const struct g_eli_metadata *md,
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const unsigned char *key, unsigned char *mkey, unsigned *nkeyp);
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int g_eli_mkey_encrypt(unsigned algo, const unsigned char *key, unsigned keylen,
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unsigned char *mkey);
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int g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize,
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const u_char *key, size_t keysize);
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int g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize,
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const u_char *key, size_t keysize);
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struct hmac_ctx {
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SHA512_CTX shactx;
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u_char k_opad[128];
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};
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void g_eli_crypto_hmac_init(struct hmac_ctx *ctx, const uint8_t *hkey,
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size_t hkeylen);
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void g_eli_crypto_hmac_update(struct hmac_ctx *ctx, const uint8_t *data,
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size_t datasize);
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void g_eli_crypto_hmac_final(struct hmac_ctx *ctx, uint8_t *md, size_t mdsize);
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void g_eli_crypto_hmac(const uint8_t *hkey, size_t hkeysize,
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const uint8_t *data, size_t datasize, uint8_t *md, size_t mdsize);
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#endif /* !_G_ELI_H_ */
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