6a205a3252
This patch adds a general mechanism for providing encryption keys to the kernel from the boot loader. This is intended to enable GELI support at boot time, providing a better mechanism for passing keys to the kernel than environment variables. It is designed to be extensible to other applications, and can easily handle multiple encrypted volumes with different keys. This mechanism is currently used by the pending GELI EFI work. Additionally, this mechanism can potentially be used to interface with GRUB, opening up options for coreboot+GRUB configurations with completely encrypted disks. Another benefit over the existing system is that it does not require re-deriving the user key from the password at each boot stage. Most of this patch was written by Eric McCorkle. It was extended by Allan Jude with a number of minor enhancements and extending the keybuf feature into boot2. GELI user keys are now derived once, in boot2, then passed to the loader, which reuses the key, then passes it to the kernel, where the GELI module destroys the keybuf after decrypting the volumes. Submitted by: Eric McCorkle <eric@metricspace.net> (Original Version) Reviewed by: oshogbo (earlier version), cem (earlier version) MFC after: 3 weeks Relnotes: yes Sponsored by: ScaleEngine Inc. Differential Revision: https://reviews.freebsd.org/D9575
69 lines
2.6 KiB
C
69 lines
2.6 KiB
C
/*-
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* Copyright (c) 2015 Allan Jude <allanjude@FreeBSD.org>
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* Copyright (c) 2005-2011 Pawel Jakub Dawidek <pawel@dawidek.net>
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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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#include <crypto/intake.h>
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#ifndef _GELIBOOT_H_
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#define _GELIBOOT_H_
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#ifndef DEV_BSIZE
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#define DEV_BSIZE 512
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#endif
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#ifndef DEV_GELIBOOT_BSIZE
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#define DEV_GELIBOOT_BSIZE 4096
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#endif
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#ifndef MIN
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#define MIN(a,b) (((a) < (b)) ? (a) : (b))
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#endif
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#define GELI_MAX_KEYS 64
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#define GELI_PW_MAXLEN 256
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extern void pwgets(char *buf, int n);
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void geli_init(void);
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int geli_taste(int read_func(void *vdev, void *priv, off_t off,
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void *buf, size_t bytes), struct dsk *dsk, daddr_t lastsector);
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int geli_attach(struct dsk *dskp, const char *passphrase, const u_char *mkeyp);
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int is_geli(struct dsk *dsk);
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int geli_read(struct dsk *dsk, off_t offset, u_char *buf, size_t bytes);
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int geli_decrypt(u_int algo, u_char *data, size_t datasize,
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const u_char *key, size_t keysize, const uint8_t* iv);
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int geli_havekey(struct dsk *dskp);
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int geli_passphrase(char *pw, int disk, int parttype, int part, struct dsk *dskp);
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int geliboot_crypt(u_int algo, int enc, u_char *data, size_t datasize,
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const u_char *key, size_t keysize, u_char *iv);
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void geli_fill_keybuf(struct keybuf *keybuf);
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void geli_save_keybuf(struct keybuf *keybuf);
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#endif /* _GELIBOOT_H_ */
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