summaryrefslogtreecommitdiffstats
path: root/utils/sbtools/sb.h
blob: 548b3ef55aad1efb042d92d29ff3ccda4f3c92bb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2011 Amaury Pouly
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#ifndef __SB_H__
#define __SB_H__

#include <stdint.h>
#include <stdbool.h>

#include "misc.h"

#define BLOCK_SIZE      16

/* All fields are in big-endian BCD */
struct sb_version_t
{
    uint16_t major;
    uint16_t pad0;
    uint16_t minor;
    uint16_t pad1;
    uint16_t revision;
    uint16_t pad2;
};

struct sb_header_t
{
    uint8_t sha1_header[20]; /* SHA-1 of the rest of the header */
    uint8_t signature[4]; /* Signature "STMP" */
    uint8_t major_ver; /* Should be 1 */
    uint8_t minor_ver; /* Should be 1 */
    uint16_t flags;
    uint32_t image_size; /* In blocks (=16bytes) */
    uint32_t first_boot_tag_off; /* Offset in blocks */
    uint32_t first_boot_sec_id; /* First bootable section ID */
    uint16_t nr_keys; /* Number of encryption keys */
    uint16_t key_dict_off; /* Offset to key dictionary (in blocks) */
    uint16_t header_size; /* In blocks */
    uint16_t nr_sections; /* Number of sections */
    uint16_t sec_hdr_size; /* Section header size (in blocks) */
    uint8_t rand_pad0[6]; /* Random padding */
    uint64_t timestamp; /* In microseconds since 2000/1/1 00:00:00 */
    struct sb_version_t product_ver;
    struct sb_version_t component_ver;
    uint16_t drive_tag; /* first tag to boot ? */
    uint8_t rand_pad1[6]; /* Random padding */
} __attribute__((packed));

struct sb_section_header_t
{
    uint32_t identifier;
    uint32_t offset; /* In blocks */
    uint32_t size; /* In blocks */
    uint32_t flags;
} __attribute__((packed));

struct sb_key_dictionary_entry_t
{
    uint8_t hdr_cbc_mac[16]; /* CBC-MAC of the header */
    uint8_t key[16]; /* Actual AES Key (encrypted by the global key) */
} __attribute__((packed));

#define IMAGE_MAJOR_VERSION     1
#define IMAGE_MINOR_VERSION     1

#define SECTION_BOOTABLE        (1 << 0)
#define SECTION_CLEARTEXT       (1 << 1)

#define SB_INST_NOP     0x0
#define SB_INST_TAG     0x1
#define SB_INST_LOAD    0x2
#define SB_INST_FILL    0x3
#define SB_INST_JUMP    0x4
#define SB_INST_CALL    0x5
#define SB_INST_MODE    0x6

/* flags */
#define SB_INST_LAST_TAG    1 /* for TAG */
#define SB_INST_LOAD_DCD    1 /* for LOAD */
#define SB_INST_FILL_BYTE   0 /* for FILL */
#define SB_INST_FILL_HWORD  1 /* for FILL */
#define SB_INST_FILL_WORD   2 /* for FILL */
#define SB_INST_HAB_EXEC    1 /* for JUMP/CALL */

struct sb_instruction_header_t
{
    uint8_t checksum;
    uint8_t opcode;
    uint16_t flags;
} __attribute__((packed));

struct sb_instruction_common_t
{
    struct sb_instruction_header_t hdr;
    uint32_t addr;
    uint32_t len;
    uint32_t data;
} __attribute__((packed));

struct sb_instruction_load_t
{
    struct sb_instruction_header_t hdr;
    uint32_t addr;
    uint32_t len;
    uint32_t crc;
} __attribute__((packed));

struct sb_instruction_fill_t
{
    struct sb_instruction_header_t hdr;
    uint32_t addr;
    uint32_t len;
    uint32_t pattern;
} __attribute__((packed));

struct sb_instruction_mode_t
{
    struct sb_instruction_header_t hdr;
    uint32_t zero1;
    uint32_t zero2;
    uint32_t mode;
} __attribute__((packed));

struct sb_instruction_call_t
{
    struct sb_instruction_header_t hdr;
    uint32_t addr;
    uint32_t zero;
    uint32_t arg;
} __attribute__((packed));

struct sb_instruction_tag_t
{
    struct sb_instruction_header_t hdr;
    uint32_t identifier; /* section identifier */
    uint32_t len; /* length of the section */
    uint32_t flags; /* section flags */
} __attribute__((packed));

/*******
 * API *
 *******/

#define SB_INST_DATA    0xff

struct sb_inst_t
{
    uint8_t inst; /* SB_INST_* */
    uint32_t size;
    uint32_t addr;
    // <union>
    void *data;
    uint32_t pattern;
    // </union>
    uint32_t argument; // for call, jump and mode
    /* for production use */
    uint32_t padding_size;
    uint8_t *padding;
};

struct sb_section_t
{
    uint32_t identifier;
    bool is_data;
    bool is_cleartext;
    uint32_t alignment;
    // data sections are handled as one or more SB_INST_DATA virtual instruction 
    int nr_insts;
    struct sb_inst_t *insts;
    /* for production use */
    uint32_t file_offset; /* in blocks */
    uint32_t sec_size; /* in blocks */
};

struct sb_file_t
{
    /* override real, otherwise it is randomly generated */
    uint8_t (*real_key)[16];
    /* override crypto IV, use with caution ! Use NULL to generate it */
    uint8_t (*crypto_iv)[16];
    
    int nr_sections;
    uint16_t drive_tag;
    uint32_t first_boot_sec_id;
    uint16_t flags;
    uint8_t minor_version;
    struct sb_section_t *sections;
    struct sb_version_t product_ver;
    struct sb_version_t component_ver;
    /* for production use */
    uint32_t image_size; /* in blocks */
};

void sb_write_file(struct sb_file_t *sb, const char *filename);

typedef void (*sb_color_printf)(void *u, bool err, color_t c, const char *f, ...);
struct sb_file_t *sb_read_file(const char *filename, bool raw_mode, void *u,
    sb_color_printf printf);

void sb_dump(struct sb_file_t *file, void *u, sb_color_printf printf);

#endif /* __SB_H__ */