1 files changed, 366 insertions, 0 deletions

diff --git a/sys/geom/eli/g_eli.h b/sys/geom/eli/g_eli.h
new file mode 100644
index 0000000..62bee40
--- /dev/null
+++ b/sys/geom/eli/g_eli.h
@@ -0,0 +1,366 @@
+/*-
+ * Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	_G_ELI_H_
+#define	_G_ELI_H_
+
+#include <sys/endian.h>
+#include <sys/errno.h>
+#include <sys/malloc.h>
+#include <crypto/sha2/sha2.h>
+#include <opencrypto/cryptodev.h>
+#ifdef _KERNEL
+#include <sys/bio.h>
+#include <sys/libkern.h>
+#include <geom/geom.h>
+#else
+#include <stdio.h>
+#include <string.h>
+#endif
+#ifndef _OpenSSL_
+#include <sys/md5.h>
+#endif
+
+#define	G_ELI_CLASS_NAME	"ELI"
+#define	G_ELI_MAGIC		"GEOM::ELI"
+#define	G_ELI_SUFFIX		".eli"
+
+/*
+ * Version history:
+ * 0 - Initial version number.
+ */
+#define	G_ELI_VERSION		0
+
+/* Use random, onetime keys. */
+#define	G_ELI_FLAG_ONETIME	0x00000001
+/* Ask for the passphrase from the kernel, before mounting root. */
+#define	G_ELI_FLAG_BOOT		0x00000002
+/* Detach on last close, if we were open for writing. */
+#define	G_ELI_FLAG_WO_DETACH	0x00000004
+/* Detach on last close. */
+#define	G_ELI_FLAG_RW_DETACH	0x00000008
+/* Provider was open for writing. */
+#define	G_ELI_FLAG_WOPEN	0x00010000
+/* Destroy device. */
+#define	G_ELI_FLAG_DESTROY	0x00020000
+
+#define	SHA512_MDLEN		64
+
+#define	G_ELI_MAXMKEYS		2
+#define	G_ELI_MAXKEYLEN		64
+#define	G_ELI_USERKEYLEN	G_ELI_MAXKEYLEN
+#define	G_ELI_DATAKEYLEN	G_ELI_MAXKEYLEN
+#define	G_ELI_IVKEYLEN		G_ELI_MAXKEYLEN
+#define	G_ELI_SALTLEN		64
+#define	G_ELI_DATAIVKEYLEN	(G_ELI_DATAKEYLEN + G_ELI_IVKEYLEN)
+/* Data-Key, IV-Key, HMAC_SHA512(Derived-Key, Data-Key+IV-Key) */
+#define	G_ELI_MKEYLEN		(G_ELI_DATAIVKEYLEN + SHA512_MDLEN)
+
+#ifdef _KERNEL
+extern u_int g_eli_debug;
+extern u_int g_eli_overwrites;
+
+#define	G_ELI_CRYPTO_HW		1
+#define	G_ELI_CRYPTO_SW		2
+
+#define	G_ELI_DEBUG(lvl, ...)	do {					\
+	if (g_eli_debug >= (lvl)) {					\
+		printf("GEOM_ELI");					\
+		if (g_eli_debug > 0)					\
+			printf("[%u]", lvl);				\
+		printf(": ");						\
+		printf(__VA_ARGS__);					\
+		printf("\n");						\
+	}								\
+} while (0)
+#define	G_ELI_LOGREQ(lvl, bp, ...)	do {				\
+	if (g_eli_debug >= (lvl)) {					\
+		printf("GEOM_ELI");					\
+		if (g_eli_debug > 0)					\
+			printf("[%u]", lvl);				\
+		printf(": ");						\
+		printf(__VA_ARGS__);					\
+		printf(" ");						\
+		g_print_bio(bp);					\
+		printf("\n");						\
+	}								\
+} while (0)
+
+struct g_eli_worker {
+	struct g_eli_softc	*w_softc;
+	struct proc		*w_proc;
+	u_int			 w_number;
+	uint64_t		 w_sid;
+	LIST_ENTRY(g_eli_worker) w_next;
+};
+
+struct g_eli_softc {
+	struct g_geom	*sc_geom;
+	u_int		 sc_crypto;
+	uint8_t		 sc_datakey[G_ELI_DATAKEYLEN];
+	uint8_t		 sc_ivkey[G_ELI_IVKEYLEN];
+	SHA256_CTX	 sc_ivctx;
+	u_int		 sc_algo;
+	u_int		 sc_keylen;
+	int		 sc_nkey;
+	uint32_t	 sc_flags;
+
+	/* Only for software cryptography. */
+	struct bio_queue_head sc_queue;
+	struct mtx	 sc_queue_mtx;
+	LIST_HEAD(, g_eli_worker) sc_workers;
+};
+#define	sc_name		 sc_geom->name
+#endif	/* _KERNEL */
+
+struct g_eli_metadata {
+	char		md_magic[16];	/* Magic value. */
+	uint32_t	md_version;	/* Version number. */
+	uint32_t	md_flags;	/* Additional flags. */
+	uint16_t	md_algo;	/* Encryption algorithm. */
+	uint16_t	md_keylen;	/* Key length. */
+	uint64_t	md_provsize;	/* Provider's size. */
+	uint32_t	md_sectorsize;	/* Sector size. */
+	uint8_t		md_keys;	/* Available keys. */
+	int32_t		md_iterations;	/* Number of iterations for PKCS#5v2 */
+	uint8_t		md_salt[G_ELI_SALTLEN]; /* Salt. */
+			/* Encrypted master key (IV-key, Data-key, HMAC). */
+	uint8_t		md_mkeys[G_ELI_MAXMKEYS * G_ELI_MKEYLEN];
+	u_char		md_hash[16];	/* MD5 hash. */
+};
+#ifndef _OpenSSL_
+static __inline void
+eli_metadata_encode(struct g_eli_metadata *md, u_char *data)
+{
+	MD5_CTX ctx;
+	u_char *p;
+
+	p = data;
+	bcopy(md->md_magic, p, sizeof(md->md_magic)); p += sizeof(md->md_magic);
+	le32enc(p, md->md_version);	p += sizeof(md->md_version);
+	le32enc(p, md->md_flags);	p += sizeof(md->md_flags);
+	le16enc(p, md->md_algo);	p += sizeof(md->md_algo);
+	le16enc(p, md->md_keylen);	p += sizeof(md->md_keylen);
+	le64enc(p, md->md_provsize);	p += sizeof(md->md_provsize);
+	le32enc(p, md->md_sectorsize);	p += sizeof(md->md_sectorsize);
+	*p = md->md_keys;		p += sizeof(md->md_keys);
+	le32enc(p, md->md_iterations);	p += sizeof(md->md_iterations);
+	bcopy(md->md_salt, p, sizeof(md->md_salt)); p += sizeof(md->md_salt);
+	bcopy(md->md_mkeys, p, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys);
+	MD5Init(&ctx);
+	MD5Update(&ctx, data, p - data);
+	MD5Final(md->md_hash, &ctx);
+	bcopy(md->md_hash, p, sizeof(md->md_hash));
+}
+static __inline int
+eli_metadata_decode_v0(const u_char *data, struct g_eli_metadata *md)
+{
+	MD5_CTX ctx;
+	const u_char *p;
+
+	p = data + sizeof(md->md_magic) + sizeof(md->md_version);
+	md->md_flags = le32dec(p);	p += sizeof(md->md_flags);
+	md->md_algo = le16dec(p);	p += sizeof(md->md_algo);
+	md->md_keylen = le16dec(p);	p += sizeof(md->md_keylen);
+	md->md_provsize = le64dec(p);	p += sizeof(md->md_provsize);
+	md->md_sectorsize = le32dec(p);	p += sizeof(md->md_sectorsize);
+	md->md_keys = *p;		p += sizeof(md->md_keys);
+	md->md_iterations = le32dec(p);	p += sizeof(md->md_iterations);
+	bcopy(p, md->md_salt, sizeof(md->md_salt)); p += sizeof(md->md_salt);
+	bcopy(p, md->md_mkeys, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys);
+	MD5Init(&ctx);
+	MD5Update(&ctx, data, p - data);
+	MD5Final(md->md_hash, &ctx);
+	if (bcmp(md->md_hash, p, 16) != 0)
+		return (EINVAL);
+	return (0);
+}
+static __inline int
+eli_metadata_decode(const u_char *data, struct g_eli_metadata *md)
+{
+	int error;
+
+	bcopy(data, md->md_magic, sizeof(md->md_magic));
+	md->md_version = le32dec(data + sizeof(md->md_magic));
+	switch (md->md_version) {
+	case 0:
+		error = eli_metadata_decode_v0(data, md);
+		break;
+	default:
+		error = EINVAL;
+		break;
+	}
+	return (error);
+}
+#endif	/* !_OpenSSL */
+
+static __inline u_int
+g_eli_str2algo(const char *name)
+{
+
+	if (strcmp("null", name) == 0)
+		return (CRYPTO_NULL_CBC);
+	if (strcmp("aes", name) == 0)
+		return (CRYPTO_AES_CBC);
+	else if (strcmp("blowfish", name) == 0)
+		return (CRYPTO_BLF_CBC);
+	else if (strcmp("3des", name) == 0)
+		return (CRYPTO_3DES_CBC);
+	return (CRYPTO_ALGORITHM_MIN - 1);
+}
+
+static __inline const char *
+g_eli_algo2str(u_int algo)
+{
+
+	switch (algo) {
+	case CRYPTO_NULL_CBC:
+		return ("NULL");
+	case CRYPTO_AES_CBC:
+		return ("AES");
+	case CRYPTO_BLF_CBC:
+		return ("Blowfish");
+	case CRYPTO_3DES_CBC:
+		return ("3DES");
+	}
+	return ("unknown");
+}
+
+static __inline void
+eli_metadata_dump(const struct g_eli_metadata *md)
+{
+	static const char hex[] = "0123456789abcdef";
+	char str[sizeof(md->md_mkeys) * 2 + 1];
+	u_int i;
+
+	printf("     magic: %s\n", md->md_magic);
+	printf("   version: %u\n", (u_int)md->md_version);
+	printf("     flags: 0x%x\n", (u_int)md->md_flags);
+	printf("      algo: %s\n", g_eli_algo2str(md->md_algo));
+	printf("    keylen: %u\n", (u_int)md->md_keylen);
+	printf("  provsize: %ju\n", (uintmax_t)md->md_provsize);
+	printf("sectorsize: %u\n", (u_int)md->md_sectorsize);
+	printf("      keys: 0x%02x\n", (u_int)md->md_keys);
+	printf("iterations: %u\n", (u_int)md->md_iterations);
+	bzero(str, sizeof(str));
+	for (i = 0; i < sizeof(md->md_salt); i++) {
+		str[i * 2] = hex[md->md_salt[i] >> 4];
+		str[i * 2 + 1] = hex[md->md_salt[i] & 0x0f];
+	}
+	printf("        Salt: %s\n", str);
+	bzero(str, sizeof(str));
+	for (i = 0; i < sizeof(md->md_mkeys); i++) {
+		str[i * 2] = hex[md->md_mkeys[i] >> 4];
+		str[i * 2 + 1] = hex[md->md_mkeys[i] & 0x0f];
+	}
+	printf("Master Key: %s\n", str);
+	bzero(str, sizeof(str));
+	for (i = 0; i < 16; i++) {
+		str[i * 2] = hex[md->md_hash[i] >> 4];
+		str[i * 2 + 1] = hex[md->md_hash[i] & 0x0f];
+	}
+	printf("    MD5 hash: %s\n", str);
+}
+
+static __inline u_int
+g_eli_keylen(u_int algo, u_int keylen)
+{
+
+	switch (algo) {
+	case CRYPTO_NULL_CBC:
+		if (keylen == 0)
+			keylen = 64 * 8;
+		else {
+			if (keylen > 64 * 8)
+				keylen = 0;
+		}
+		return (keylen);
+	case CRYPTO_AES_CBC:
+		switch (keylen) {
+		case 0:
+			return (128);
+		case 128:
+		case 192:
+		case 256:
+			return (keylen);
+		default:
+			return (0);
+		}
+	case CRYPTO_BLF_CBC:
+		if (keylen == 0)
+			return (128);
+		if (keylen < 128 || keylen > 448)
+			return (0);
+		if ((keylen % 32) != 0)
+			return (0);
+		return (keylen);
+	case CRYPTO_3DES_CBC:
+		if (keylen == 0 || keylen == 192)
+			return (192);
+		return (0);
+	default:
+		return (0);
+	}
+}
+
+#ifdef _KERNEL
+int g_eli_read_metadata(struct g_class *mp, struct g_provider *pp,
+    struct g_eli_metadata *md);
+struct g_geom *g_eli_create(struct gctl_req *req, struct g_class *mp,
+    struct g_provider *bpp, const struct g_eli_metadata *md,
+    const u_char *mkey, int nkey);
+int g_eli_destroy(struct g_eli_softc *sc, boolean_t force);
+
+int g_eli_access(struct g_provider *pp, int dr, int dw, int de);
+void g_eli_config(struct gctl_req *req, struct g_class *mp, const char *verb);
+#endif
+
+void g_eli_mkey_hmac(unsigned char *mkey, const unsigned char *key);
+int g_eli_mkey_decrypt(const struct g_eli_metadata *md,
+    const unsigned char *key, unsigned char *mkey, unsigned *nkeyp);
+int g_eli_mkey_encrypt(unsigned algo, const unsigned char *key, unsigned keylen,
+    unsigned char *mkey);
+
+int g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize,
+    const u_char *key, size_t keysize);
+int g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize,
+    const u_char *key, size_t keysize);
+
+struct hmac_ctx {
+	SHA512_CTX	shactx;
+	u_char		k_opad[128];
+};
+
+void g_eli_crypto_hmac_init(struct hmac_ctx *ctx, const uint8_t *hkey,
+    size_t hkeylen);
+void g_eli_crypto_hmac_update(struct hmac_ctx *ctx, const uint8_t *data,
+    size_t datasize);
+void g_eli_crypto_hmac_final(struct hmac_ctx *ctx, uint8_t *md, size_t mdsize);
+void g_eli_crypto_hmac(const uint8_t *hkey, size_t hkeysize,
+    const uint8_t *data, size_t datasize, uint8_t *md, size_t mdsize);
+#endif	/* !_G_ELI_H_ */