Differential D10512 Diff 31487 sys/boot/efi/libefi/geli_driver.c

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sys/boot/efi/libefi/geli_driver.c

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				/*-
				* Copyright (c) 2017 Eric McCorkle
				* 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 AUTHOR 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 AUTHOR 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.
				*
				* $FreeBSD$
				*/

				#include <efi.h>
				#include <efilib.h>
				#include <efiprot.h>
				#include <efisec.h>
				#include <sys/endian.h>
				#include <sys/gpt.h>
				#include <stand.h>
				#include <stdbool.h>
				#include <crypto/intake.h>

				#include "boot_crypto.h"
				#include "efi_drivers.h"
				#include "key_inject.h"

				#define _STRING_H_
				#define _STRINGS_H_
				#define _STDIO_H_
				#include <geom/eli/g_eli.h>
				#include <geom/eli/pkcs5v2.h>

				#define MAXPWLEN 256

				typedef struct {
				struct g_eli_metadata md;
				struct g_eli_softc sc;
				EFI_DISK_IO *diskio;
				EFI_BLOCK_IO *blkio;
				EFI_HANDLE dev;
				} geli_info_t;

				static EFI_GUID DiskIOProtocolGUID = DISK_IO_PROTOCOL;
				static EFI_GUID BlockIOProtocolGUID = BLOCK_IO_PROTOCOL;
				static EFI_GUID DevicePathGUID = DEVICE_PATH_PROTOCOL;
				static EFI_GUID DriverBindingProtocolGUID = DRIVER_BINDING_PROTOCOL;
				static EFI_GUID EfiKmsProtocolGuid = EFI_KMS_PROTOCOL;
				static EFI_GUID KernelKeyInjectorGuid = KERNEL_KEY_INJECTOR_GUID;
				static EFI_GUID Generic512Guid = EFI_KMS_FORMAT_GENERIC_512_GUID;
				static EFI_GUID Generic2048Guid = EFI_KMS_FORMAT_GENERIC_2048_GUID;
				static EFI_GUID FreeBSDGELIGUID = FREEBSD_GELI_GUID;
				static EFI_DRIVER_BINDING geli_efi_driver;
				static EFI_KMS_SERVICE *kms;


				int
				geliboot_crypt(u_int algid, int enc, u_char *data, size_t datasize,
				const u_char key, size_t keysize, u_char iv)
				{
				const symmetric_alg_t* alg;

				alg = get_symmetric_alg(algid);

				if (alg == NULL) {
				printf("Unsupported crypto algorithm #%d\n", algid);
				return (1);
				}

				if(enc) {
				return encrypt_symmetric(alg, data, datasize, key, keysize, iv);
				} else {
				return decrypt_symmetric(alg, data, datasize, key, keysize, iv);
				}
				}

				static int
				g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize,
				const u_char *key, size_t keysize)
				{
				u_char iv[keysize];

				bzero(iv, sizeof(iv));
				return (geliboot_crypt(algo, enc, data, datasize, key, keysize, iv));
				}

				int
				g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize,
				const u_char *key, size_t keysize)
				{

				/* We prefer AES-CBC for metadata protection. */
				if (algo == CRYPTO_AES_XTS)
				algo = CRYPTO_AES_CBC;

				return (g_eli_crypto_cipher(algo, 1, data, datasize, key, keysize));
				}

				int
				g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize,
				const u_char *key, size_t keysize)
				{

				/* We prefer AES-CBC for metadata protection. */
				if (algo == CRYPTO_AES_XTS)
				algo = CRYPTO_AES_CBC;

				return (g_eli_crypto_cipher(algo, 0, data, datasize, key, keysize));
				}

				static void
				pwgets(char *buf, int n)
				{
				int c;
				char *lp;

				for (lp = buf;;)
				switch (c = getchar() & 0177) {
				case '\n':
				case '\r':
				*lp = '\0';
				putchar('\n');
				return;
				case '\b':
				case '\177':
				if (lp > buf) {
				lp--;
				putchar('\b');
				putchar(' ');
				putchar('\b');
				}
				break;
				case 'u' & 037:
				case 'w' & 037:
				allanjudeUnsubmitted Done Inline Actions this should be removed: https://svnweb.freebsd.org/base/head/sys/boot/geli/pwgets.c?r1=296963&r2=314213 allanjude: this should be removed: https://svnweb.freebsd.org/base/head/sys/boot/geli/pwgets.c?
				lp = buf;
				putchar('\n');
				break;
				default:
				if ((n < 1) \|\| ((lp - buf) < n - 1)) {
				*lp++ = c;
				putchar('*');
				}
				}
				}

				static EFI_STATUS
				decrypt(unsigned int algid, u_char data, size_t datasize, u_char key,
				size_t keysize, u_char *iv)
				{
				const symmetric_alg_t *alg;

				alg = get_symmetric_alg(algid);

				allanjudeUnsubmitted Done Inline Actions how is this not reached? it looks perfectly reachable. allanjude: how is this not reached? it looks perfectly reachable.
				if (alg == NULL) {
				return (EFI_INVALID_PARAMETER);
				}

				return decrypt_symmetric(alg, data, datasize, key, keysize, iv);
				}

				#define KEY_ID_SIZE 5

				static unsigned int keyid = 0;

				static EFI_STATUS
				register_key(const struct g_eli_softc sc, const char passphrase,
				const u_char key[G_ELI_USERKEYLEN])
				{
				EFI_STATUS status;
				char id_buf[EFI_KMS_KEY_IDENTIFIER_MAX_SIZE + 1];
				UINT16 count = 1;
				EFI_KMS_KEY_DESCRIPTOR desc;
				UINT8 key_id_size;

				snprintf(id_buf, EFI_KMS_KEY_IDENTIFIER_MAX_SIZE, "GELI%u", keyid);
				key_id_size = strlen(id_buf);
				desc.KeyIdentifierSize = key_id_size;
				desc.KeyIdentifier = id_buf;
				memcpy(&(desc.KeyFormat), &Generic512Guid, sizeof(EFI_GUID));
				desc.KeyValue = (void*)key;

				status = kms->AddKey(kms, NULL, &count, &desc, NULL, NULL);

				if (EFI_ERROR(status)) {
				printf("Failed to add key %lu\n", EFI_ERROR_CODE(status));
				return (status);
				}

				status = kms->AddKeyAttributes(kms, NULL, &key_id_size, id_buf, &count,
				key_attr_service_id_geli, NULL, NULL);

				if (EFI_ERROR(status)) {
				printf("Failed to add key attributes %lu\n",
				EFI_ERROR_CODE(status));
				return (status);
				}

				if (passphrase != NULL) {
				snprintf(id_buf, EFI_KMS_KEY_IDENTIFIER_MAX_SIZE, "GELIPASS%u",
				keyid);
				key_id_size = strlen(id_buf);
				desc.KeyIdentifierSize = key_id_size;
				desc.KeyIdentifier = id_buf;
				memcpy(&(desc.KeyFormat), &Generic2048Guid, sizeof(EFI_GUID));
				desc.KeyValue = (void*)passphrase;

				status = kms->AddKey(kms, NULL, &count, &desc, NULL, NULL);

				if (EFI_ERROR(status)) {
				printf("Failed to add key %lu\n",
				EFI_ERROR_CODE(status));
				return (status);
				}

				status = kms->AddKeyAttributes(kms, NULL, &key_id_size, id_buf,
				&count, key_attr_service_id_passphrase, NULL, NULL);

				if (EFI_ERROR(status)) {
				printf("Failed to add key attributes %lu\n",
				EFI_ERROR_CODE(status));
				return (status);
				}
				}

				keyid++;

				return (EFI_SUCCESS);
				}

				static EFI_STATUS
				try_password(struct g_eli_metadata md, struct g_eli_softc sc,
				char *passphrase, bool register_pw)
				{
				u_char key[G_ELI_USERKEYLEN], mkey[G_ELI_DATAIVKEYLEN], *mkp;
				u_int keynum;
				struct hmac_ctx ctx;
				int error;

				g_eli_crypto_hmac_init(&ctx, NULL, 0);
				/*
				* Prepare Derived-Key from the user passphrase.
				*/
				if (md->md_iterations == 0) {
				g_eli_crypto_hmac_update(&ctx, md->md_salt,
				sizeof(md->md_salt));
				g_eli_crypto_hmac_update(&ctx, passphrase,
				strlen(passphrase));
				} else if (md->md_iterations > 0) {
				u_char dkey[G_ELI_USERKEYLEN];

				pkcs5v2_genkey(dkey, sizeof(dkey), md->md_salt,
				sizeof(md->md_salt), passphrase,
				md->md_iterations);
				g_eli_crypto_hmac_update(&ctx, dkey, sizeof(dkey));
				explicit_bzero(&dkey, sizeof(dkey));
				}

				g_eli_crypto_hmac_final(&ctx, key, 0);

				error = g_eli_mkey_decrypt(md, key, mkey, &keynum);
				if (error == -1) {
				bzero(&key, sizeof(key));
				bzero(&mkey, sizeof(mkey));
				return (EFI_ACCESS_DENIED);
				} else if (error != 0) {
				bzero(&key, sizeof(key));
				bzero(&mkey, sizeof(mkey));
				printf("Failed to decrypt GELI master key: %d\n", error);
				return (EFI_LOAD_ERROR);
				}

				/* Register the new key */
				if (register_pw)
				register_key(sc, passphrase, key);
				else
				register_key(sc, NULL, key);

				bzero(&key, sizeof(key));

				/* Store the keys */
				bcopy(mkey, sc->sc_mkey, sizeof(sc->sc_mkey));
				bcopy(mkey, sc->sc_ivkey, sizeof(sc->sc_ivkey));
				mkp = mkey + sizeof(sc->sc_ivkey);
				if ((sc->sc_flags & G_ELI_FLAG_AUTH) == 0) {
				bcopy(mkp, sc->sc_ekey, G_ELI_DATAKEYLEN);
				} else {
				/*
				* The encryption key is: ekey = HMAC_SHA512(Data-Key, 0x10)
				*/
				g_eli_crypto_hmac(mkp, G_ELI_MAXKEYLEN, "\x10", 1,
				sc->sc_ekey, 0);
				}
				bzero(&mkey, sizeof(mkey));

				/* Initialize the per-sector IV */
				switch (sc->sc_ealgo) {
				case CRYPTO_AES_XTS:
				break;
				default:
				SHA256_Init(&sc->sc_ivctx);
				SHA256_Update(&sc->sc_ivctx, sc->sc_ivkey,
				sizeof(sc->sc_ivkey));
				break;
				}
				return (EFI_SUCCESS);
				}

				static EFI_STATUS
				try_cached_passphrases(struct g_eli_metadata md, struct g_eli_softc sc)
				{
				EFI_STATUS status;
				UINTN i;
				UINTN count = 1;
				UINTN nkeydescs = 0;
				EFI_KMS_KEY_DESCRIPTOR *keydescs;

				status = kms->GetKeyByAttributes(kms, NULL, &count,
				key_attr_service_id_passphrase, &nkeydescs, NULL, NULL, NULL);

				/* We might get EFI_SUCCESS if there are no keys */
				if (status == EFI_SUCCESS \|\| status == EFI_NOT_FOUND \|\|
				nkeydescs == 0) {
				return (EFI_ACCESS_DENIED);
				} else if (status != EFI_BUFFER_TOO_SMALL) {
				printf("Error getting number of passphrases: %lu\n",
				EFI_ERROR_CODE(status));
				return (status);
				}

				keydescs = malloc(nkeydescs * sizeof(EFI_KMS_KEY_DESCRIPTOR));

				for(i = 0; i < nkeydescs; i++) {
				keydescs[i].KeyValue = malloc(MAX_KEY_BYTES);
				}

				if(keydescs == NULL) {
				return (EFI_OUT_OF_RESOURCES);
				}

				status = kms->GetKeyByAttributes(kms, NULL, &count,
				key_attr_service_id_passphrase, &nkeydescs, keydescs, NULL, NULL);

				if (EFI_ERROR(status)) {
				printf("Error getting passphrases: %lu\n",
				EFI_ERROR_CODE(status));
				free(keydescs);

				return (status);
				}

				for(i = 0; i < nkeydescs; i++) {
				status = try_password(md, sc, keydescs[i].KeyValue, false);

				if (status != EFI_ACCESS_DENIED) {
				for(; i < nkeydescs; i++) {
				memset(keydescs[i].KeyValue, 0, MAX_KEY_BYTES);
				free(keydescs[i].KeyValue);

				}

				free(keydescs);
				return (status);
				}

				memset(keydescs[i].KeyValue, 0, MAX_KEY_BYTES);
				free(keydescs[i].KeyValue);
				}

				free(keydescs);

				return (EFI_ACCESS_DENIED);
				}

				static EFI_STATUS
				try_keys(struct g_eli_metadata md, struct g_eli_softc sc)
				{
				EFI_STATUS status;
				UINTN i;
				UINTN count = 1;
				UINTN nkeydescs = 0;
				EFI_KMS_KEY_DESCRIPTOR *keydescs;
				u_char mkey[G_ELI_DATAIVKEYLEN], *mkp;
				u_int keynum;

				status = kms->GetKeyByAttributes(kms, NULL, &count,
				key_attr_service_id_geli, &nkeydescs, NULL, NULL, NULL);

				/* We might get EFI_SUCCESS if there are no keys */
				if (status == EFI_SUCCESS \|\| status == EFI_NOT_FOUND \|\|
				nkeydescs == 0) {
				return (try_cached_passphrases(md, sc));
				} else if (status != EFI_BUFFER_TOO_SMALL) {
				printf("Error getting number of keys: %lu\n",
				EFI_ERROR_CODE(status));
				return (status);
				}

				keydescs = malloc(nkeydescs * sizeof(EFI_KMS_KEY_DESCRIPTOR));

				for(i = 0; i < nkeydescs; i++) {
				keydescs[i].KeyValue = malloc(MAX_KEY_BYTES);
				}

				if(keydescs == NULL) {
				return (EFI_OUT_OF_RESOURCES);
				}

				status = kms->GetKeyByAttributes(kms, NULL, &count,
				key_attr_service_id_geli, &nkeydescs, keydescs, NULL, NULL);

				if (EFI_ERROR(status)) {
				printf("Error getting keys: %lu\n", EFI_ERROR_CODE(status));
				free(keydescs);

				return (status);
				}

				/* Try all keys with the right encryption type */
				for(i = 0; i < nkeydescs; i++) {
				if(g_eli_mkey_decrypt(md, keydescs[i].KeyValue,
				mkey, &keynum) == 0) {
				for(; i < nkeydescs; i++) {
				memset(keydescs[i].KeyValue, 0, MAX_KEY_BYTES);
				free(keydescs[i].KeyValue);

				}

				free(keydescs);

				/* Store the keys */
				bcopy(mkey, sc->sc_mkey, sizeof(sc->sc_mkey));
				bcopy(mkey, sc->sc_ivkey, sizeof(sc->sc_ivkey));
				mkp = mkey + sizeof(sc->sc_ivkey);
				if ((sc->sc_flags & G_ELI_FLAG_AUTH) == 0) {
				bcopy(mkp, sc->sc_ekey, G_ELI_DATAKEYLEN);
				} else {
				/*
				* The encryption key is: ekey = HMAC_SHA512(Data-Key, 0x10)
				*/
				g_eli_crypto_hmac(mkp, G_ELI_MAXKEYLEN, "\x10", 1,
				sc->sc_ekey, 0);
				}
				bzero(&mkey, sizeof(mkey));

				/* Initialize the per-sector IV */
				switch (sc->sc_ealgo) {
				case CRYPTO_AES_XTS:
				break;
				default:
				SHA256_Init(&sc->sc_ivctx);
				SHA256_Update(&sc->sc_ivctx, sc->sc_ivkey,
				sizeof(sc->sc_ivkey));
				break;
				}

				memset(keydescs, 0,
				nkeydescs * sizeof(EFI_KMS_KEY_DESCRIPTOR));
				free(keydescs);

				return (EFI_SUCCESS);
				} else {
				memset(keydescs[i].KeyValue, 0, MAX_KEY_BYTES);
				free(keydescs[i].KeyValue);
				}

				memset(keydescs[i].KeyValue, 0, MAX_KEY_BYTES);
				}

				memset(keydescs, 0, nkeydescs * sizeof(EFI_KMS_KEY_DESCRIPTOR));
				free(keydescs);

				return (try_cached_passphrases(md, sc));
				}

				static EFI_STATUS
				ask_password(struct g_eli_metadata md, struct g_eli_softc sc) {
				char pwbuf[MAXPWLEN + 1];
				EFI_STATUS status;
				UINTN i;

				for(i = 0, status = EFI_ACCESS_DENIED;
				i < 5 && status == EFI_ACCESS_DENIED; i++) {
				printf("Enter passphrase for encrypted volume: ");
				pwgets(pwbuf, MAXPWLEN);
				status = try_password(md, sc, pwbuf, true);
				memset(pwbuf, 0, MAXPWLEN);

				if (status == EFI_SUCCESS) {
				printf("OK\n");
				} else if (status == EFI_ACCESS_DENIED) {
				printf("Incorrect\n");
				} else {
				printf("Error!\n");
				}
				}

				if (status == EFI_ACCESS_DENIED) {
				printf("Access denied: too many tries\n");
				}

				return (status);
				}

				static EFI_STATUS
				discover(struct g_eli_metadata md, struct g_eli_softc sc, EFI_BLOCK_IO *inner,
				EFI_HANDLE dev)
				{
				u_char buf[inner->Media->BlockSize];
				int error;
				EFI_STATUS status;

				memset(md, 0, sizeof(struct g_eli_metadata));
				memset(sc, 0, sizeof(struct g_eli_softc));
				status = inner->ReadBlocks(inner, inner->Media->MediaId,
				inner->Media->LastBlock, inner->Media->BlockSize, buf);

				if (status != EFI_SUCCESS) {
				if (status != EFI_NO_MEDIA && status != EFI_MEDIA_CHANGED) {
				printf("Failed to read last block (%lu)\n",
				EFI_ERROR_CODE(status));
				}
				return (status);
				}

				error = eli_metadata_decode(buf, md);

				/* EINVAL means not found */
				if (error == EINVAL) {
				return (EFI_NOT_FOUND);
				} else if (error == EOPNOTSUPP) {
				return (EFI_UNSUPPORTED);
				} else if (error != 0) {
				return (EFI_LOAD_ERROR);
				}

				if ((md->md_flags & G_ELI_FLAG_ONETIME)) {
				/* Swap device, skip it */
				return (EFI_NOT_FOUND);
				}

				if (!(md->md_flags & G_ELI_FLAG_BOOT)) {
				/* Disk is not GELI boot device, skip it */
				return (EFI_NOT_FOUND);
				}

				/* First, try all the existing keys */
				status = try_keys(md, sc);

				if (status != EFI_SUCCESS) {
				/* If none of them work, give the user five tries to input a
				* new password
				*/
				if (status == EFI_ACCESS_DENIED) {
				status = ask_password(md, sc);

				if (status != EFI_SUCCESS) {
				return (status);
				}
				} else {
				return (status);
				}
				}

				eli_metadata_softc(sc, md, inner->Media->BlockSize,
				(inner->Media->LastBlock * inner->Media->BlockSize) +
				inner->Media->BlockSize);

				return (EFI_SUCCESS);
				}

				static EFI_STATUS EFIAPI
				reset_impl(EFI_BLOCK_IO *This, BOOLEAN ev)
				{
				geli_info_t info = (geli_info_t)(This + 1);

				return info->blkio->Reset(info->blkio, ev);
				}

				static EFI_STATUS EFIAPI
				read_impl(EFI_BLOCK_IO *This, UINT32 MediaID, EFI_LBA LBA,
				UINTN BufferSize, VOID *Buffer)
				{
				geli_info_t info = (geli_info_t)(This + 1);
				char iv[G_ELI_IVKEYLEN];
				char *pbuf = Buffer;
				off_t offset;
				uint64_t keyno;
				size_t n, nb;
				struct g_eli_key gkey;
				EFI_STATUS status;

				// Read the raw data
				status = info->blkio->ReadBlocks(info->blkio,
				info->blkio->Media->MediaId, LBA, BufferSize, Buffer);

				if (EFI_ERROR(status)) {
				printf("Error reading encrypted blocks (%lu)\n",
				EFI_ERROR_CODE(status));
				return (status);
				}

				nb = BufferSize / info->sc.sc_sectorsize;

				for (n = 0; n < nb; n++) {
				offset = (LBA * info->blkio->Media->BlockSize) +
				(n * info->sc.sc_sectorsize);
				pbuf = (char)Buffer + (n info->sc.sc_sectorsize);

				g_eli_crypto_ivgen(&(info->sc), offset, iv, G_ELI_IVKEYLEN);

				/* Get the key that corresponds to this offset */
				keyno = (offset >> G_ELI_KEY_SHIFT) /
				info->sc.sc_sectorsize;

				g_eli_key_fill(&(info->sc), &gkey, keyno);

				status = decrypt(info->sc.sc_ealgo, pbuf,
				info->sc.sc_sectorsize, gkey.gek_key,
				info->sc.sc_ekeylen, iv);

				if (status != EFI_SUCCESS) {
				printf("Error decrypting blocks %lu\n",
				EFI_ERROR_CODE(status));
				explicit_bzero(&gkey, sizeof(gkey));
				return (status);
				}
				}

				explicit_bzero(&gkey, sizeof(gkey));

				return (EFI_SUCCESS);
				}

				static EFI_STATUS EFIAPI
				write_impl(EFI_BLOCK_IO *This __unused, UINT32 MediaID __unused,
				EFI_LBA LBA __unused, UINTN BufferSize __unused, VOID *Buffer __unused)
				{
				return (EFI_UNSUPPORTED);
				}

				static EFI_STATUS EFIAPI
				flush_impl(EFI_BLOCK_IO *This)
				{
				geli_info_t info = (geli_info_t)(This + 1);

				return info->blkio->FlushBlocks(info->blkio);
				}

				static EFI_BLOCK_IO*
				make_block_io_iface(struct g_eli_metadata md, struct g_eli_softc sc,
				EFI_BLOCK_IO *inner, EFI_HANDLE dev)
				{
				EFI_BLOCK_IO *blkio;
				geli_info_t *info;

				if ((blkio = malloc(sizeof(EFI_BLOCK_IO) + sizeof(geli_info_t))) ==
				NULL) {
				return NULL;
				}

				if ((blkio->Media = malloc(sizeof(EFI_BLOCK_IO_MEDIA))) == NULL) {
				free(blkio);

				return NULL;
				}

				info = (geli_info_t*)(blkio + 1);
				blkio->Revision = EFI_BLOCK_IO_INTERFACE_REVISION;
				blkio->Media->MediaId = inner->Media->MediaId;
				blkio->Media->RemovableMedia = false;
				blkio->Media->MediaPresent = true;
				blkio->Media->LogicalPartition = true;
				blkio->Media->ReadOnly = true;
				blkio->Media->WriteCaching = false;
				blkio->Media->BlockSize = inner->Media->BlockSize;
				blkio->Media->IoAlign = inner->Media->IoAlign;
				blkio->Media->LastBlock = inner->Media->LastBlock - 1;
				blkio->Reset = reset_impl;
				blkio->ReadBlocks = read_impl;
				blkio->WriteBlocks = write_impl;
				blkio->FlushBlocks = flush_impl;
				memcpy(&(info->md), md, sizeof(struct g_eli_metadata));
				memcpy(&(info->sc), sc, sizeof(struct g_eli_softc));
				info->dev = dev;

				return blkio;
				}

				static EFI_STATUS EFIAPI
				supported_impl(EFI_DRIVER_BINDING *This, EFI_HANDLE handle,
				EFI_DEVICE_PATH *RemainingDevicePath __unused)
				{
				return (BS->OpenProtocol(handle, &BlockIOProtocolGUID, NULL,
				This->DriverBindingHandle, handle,
				EFI_OPEN_PROTOCOL_TEST_PROTOCOL));
				}

				static EFI_STATUS EFIAPI
				start_impl(EFI_DRIVER_BINDING *This, EFI_HANDLE handle,
				EFI_DEVICE_PATH *RemainingDevicePath __unused)
				{
				EFI_BLOCK_IO *blkio;
				EFI_DISK_IO *driver_diskio;
				EFI_STATUS status;
				EFI_BLOCK_IO *newio;
				EFI_HANDLE newhandle = NULL;
				EFI_DEVICE_PATH devpath, newpath, currpath, newcurr;
				VENDOR_DEVICE_PATH *vendornode;
				struct g_eli_metadata md;
				struct g_eli_softc sc;
				UINTN pathlen;
				geli_info_t *info;

				/* Grab Disk IO to make sure that we don't end up registering
				* this handle twice.
				*/
				status = BS->OpenProtocol(handle, &DiskIOProtocolGUID,
				(void**)&driver_diskio, This->DriverBindingHandle, handle,
				EFI_OPEN_PROTOCOL_BY_DRIVER);

				if (EFI_ERROR(status)) {
				if (status != EFI_ACCESS_DENIED &&
				status != EFI_ALREADY_STARTED &&
				status != EFI_UNSUPPORTED) {
				printf("Could not open device %lu\n",
				EFI_ERROR_CODE(status));
				}

				return (status);
				}

				/* Build device path */
				status = BS->OpenProtocol(handle, &DevicePathGUID, (void**)&devpath,
				This->DriverBindingHandle, handle, EFI_OPEN_PROTOCOL_GET_PROTOCOL);

				if (EFI_ERROR(status)) {
				printf("Failed to obtain device path %lu\n",
				EFI_ERROR_CODE(status));
				free(newio);

				return (status);
				}

				currpath = devpath;
				pathlen = 0;

				while (!IsDevicePathEnd(currpath)) {
				pathlen += DevicePathNodeLength(currpath);
				currpath = NextDevicePathNode(currpath);
				}

				pathlen += sizeof(EFI_DEVICE_PATH);
				pathlen += sizeof(VENDOR_DEVICE_PATH);
				newpath = malloc(pathlen);

				if (newpath == NULL) {
				printf("Failed to create new device path\n");

				return (status);
				}

				currpath = devpath;
				newcurr = newpath;

				while (!IsDevicePathEnd(currpath)) {
				memcpy(newcurr, currpath, DevicePathNodeLength(currpath));
				currpath = NextDevicePathNode(currpath);
				newcurr = NextDevicePathNode(newcurr);
				}

				vendornode = (VENDOR_DEVICE_PATH *)newcurr;
				vendornode->Header.Type = MEDIA_DEVICE_PATH;
				vendornode->Header.SubType = MEDIA_VENDOR_DP;
				vendornode->Header.Length[0] = sizeof(VENDOR_DEVICE_PATH);
				vendornode->Header.Length[1] = 0;
				memcpy(&(vendornode->Guid), &FreeBSDGELIGUID, sizeof(EFI_GUID));
				newcurr = NextDevicePathNode(newcurr);
				SetDevicePathEndNode(newcurr);
				devpath = newpath;

				BS->CloseProtocol(handle, &DevicePathGUID, This->DriverBindingHandle,
				handle);

				/* Get block IO */
				status = BS->OpenProtocol(handle, &BlockIOProtocolGUID, (void**)&blkio,
				This->DriverBindingHandle, handle, EFI_OPEN_PROTOCOL_GET_PROTOCOL);

				if (EFI_ERROR(status)) {
				printf("Could not open device %lu\n", EFI_ERROR_CODE(status));
				free(newpath);

				return (status);
				}

				/* Test for GELI presence */
				status = discover(&md, &sc, blkio, handle);

				if (EFI_ERROR(status)) {
				BS->CloseProtocol(handle, &BlockIOProtocolGUID,
				This->DriverBindingHandle, handle);
				free(newpath);

				return (status);
				}

				/* Make Block IO interface */
				newio = make_block_io_iface(&md, &sc, blkio, handle);
				info = (geli_info_t*)(newio + 1);
				info->diskio = driver_diskio;
				BS->CloseProtocol(handle, &BlockIOProtocolGUID,
				This->DriverBindingHandle, handle);

				if (newio == NULL) {
				free(newpath);
				printf("Failed to create new IO interface!\n");
				return (EFI_OUT_OF_RESOURCES);
				}

				/* Create device handle and attach interfaces */
				status = BS->InstallMultipleProtocolInterfaces(&newhandle,
				&BlockIOProtocolGUID, newio, &DevicePathGUID, newpath, NULL);

				if (EFI_ERROR(status)) {
				printf("Could not create child device %lu\n",
				EFI_ERROR_CODE(status));
				free(newio);
				free(newpath);

				return (status);
				}

				status = BS->OpenProtocol(handle, &BlockIOProtocolGUID,
				(void**)&(info->blkio), This->DriverBindingHandle, newhandle,
				EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER);

				if (EFI_ERROR(status)) {
				printf("Could not associate child device %lu\n",
				EFI_ERROR_CODE(status));
				return (status);
				}

				return (EFI_SUCCESS);
				}

				static EFI_STATUS EFIAPI
				stop_impl(EFI_DRIVER_BINDING *This __unused, EFI_HANDLE handle __unused,
				UINTN NumberOfChildren __unused, EFI_HANDLE *ChildHandleBuffer __unused)
				{
				return (EFI_UNSUPPORTED);
				}

				static EFI_STATUS
				locate_kms(void)
				{
				EFI_HANDLE *handles;
				EFI_STATUS status;
				UINTN sz;
				u_int n, nin;

				/* Try and find a usable KMS */
				sz = 0;
				handles = NULL;
				status = BS->LocateHandle(ByProtocol, &EfiKmsProtocolGuid, NULL, &sz,
				NULL);

				if (status == EFI_BUFFER_TOO_SMALL) {
				handles = (EFI_HANDLE *)malloc(sz);
				status = BS->LocateHandle(ByProtocol, &EfiKmsProtocolGuid, 0,
				&sz, handles);
				if (EFI_ERROR(status)) {
				printf("Error getting KMS handles (%lu)\n",
				EFI_ERROR_CODE(status));
				free(handles);

				return (status);
				}
				} else {
				printf("Error getting size of KMS buffer (%lu)\n",
				EFI_ERROR_CODE(status));

				return (status);
				}

				nin = sz / sizeof(EFI_HANDLE);

				for (n = 0; n < nin; n++) {
				status = BS->OpenProtocol(handles[n], &EfiKmsProtocolGuid,
				(void**)&kms, IH, handles[n],
				EFI_OPEN_PROTOCOL_GET_PROTOCOL);

				if (EFI_ERROR(status)) {
				printf("Failed to obtain KMS protocol interface (%lu)\n",
				EFI_ERROR_CODE(status));
				return (status);
				}

				if (!memcmp(&KernelKeyInjectorGuid, &(kms->ServiceId),
				sizeof(EFI_GUID))) {
				free(handles);

				return (EFI_SUCCESS);
				}

				BS->CloseProtocol(handles[n], &KernelKeyInjectorGuid,
				IH, handles[n]);
				}

				return (EFI_NOT_FOUND);
				}

				static void
				init(void)
				{
				EFI_STATUS status;
				EFI_HANDLE *handles;
				UINTN nhandles, i, hsize;

				status = locate_kms();

				if (EFI_ERROR(status)) {
				printf("Error locating usable KMS (%lu)\n",
				EFI_ERROR_CODE(status));

				return;
				}

				geli_efi_driver.ImageHandle = IH;
				geli_efi_driver.DriverBindingHandle = NULL;
				status = BS->InstallMultipleProtocolInterfaces(
				&(geli_efi_driver.DriverBindingHandle), &DriverBindingProtocolGUID,
				&geli_efi_driver, NULL);

				if (EFI_ERROR(status)) {
				printf("Failed to install GELI driver (%ld)!\n",
				EFI_ERROR_CODE(status));

				return;
				}

				nhandles = 0;
				hsize = 0;
				status = BS->LocateHandle(ByProtocol, &BlockIOProtocolGUID, NULL,
				&hsize, NULL);

				if (status != EFI_BUFFER_TOO_SMALL) {
				printf("Could not get number of handles! (%ld)\n",
				EFI_ERROR_CODE(status));
				return;
				}

				handles = malloc(hsize);
				nhandles = hsize / sizeof(EFI_HANDLE);

				status = BS->LocateHandle(ByProtocol, &BlockIOProtocolGUID, NULL,
				&hsize, handles);

				if (EFI_ERROR(status)) {
				printf("Could not get handles! (%ld)\n",
				EFI_ERROR_CODE(status));
				return;
				}

				for (i = 0; i < nhandles; i++) {
				BS->ConnectController(handles[i], NULL, NULL, false);
				}

				free(handles);
				}

				static EFI_DRIVER_BINDING geli_efi_driver = {
				.Version = 0x10,
				.Supported = supported_impl,
				.Start = start_impl,
				.Stop = stop_impl
				};

				const efi_driver_t geli_driver =
				{
				.name = "GELI",
				.init = init,
				};