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
|
#include <stdlib.h>
#include <stdint.h>
#include <sys/types.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>
#include <fcntl.h>
#include <unistd.h>
#include <efi.h>
#include <version.h>
#include <guid.h>
#include "efiauthenticated.h"
#include "variableformat.h"
static void
usage(const char *progname)
{
printf("Usage: %s: [-l] [-g <owner guid>] [-t <timestamp>] <flashfile> <var> <varcontentfile>\n", progname);
}
static void
help(const char *progname)
{
usage(progname);
printf("Poke a variable definition into a flash file\n\n"
"Options:\n"
"\t-g <owner guid> Variable owner GUID\n"
"\t-t <timestamp> Timestamp for the authenticated variable\n"
"\t-l List current flash variables\n"
);
}
int
main(int argc, char *argv[])
{
char *progname = argv[0], *buf, *vardata, *timestampstr = NULL;
uint32_t attributes = EFI_VARIABLE_NON_VOLATILE
| EFI_VARIABLE_RUNTIME_ACCESS
| EFI_VARIABLE_BOOTSERVICE_ACCESS
| EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS;
int flashfile, varfile, i, offset, varlen, varfilesize, listvars = 0;
const int chunk = 8;
wchar_t var[128];
struct stat st;
EFI_GUID *owner = NULL, guid;
EFI_TIME timestamp;
while (argc > 1 && argv[1][0] == '-') {
if (strcmp("--version", argv[1]) == 0) {
version(progname);
exit(0);
} else if (strcmp("--help", argv[1]) == 0) {
help(progname);
exit(0);
} else if (strcmp(argv[1], "-g") == 0) {
if (str_to_guid(argv[2], &guid)) {
fprintf(stderr, "Invalid GUID %s\n", argv[2]);
exit(1);
}
owner = &guid;
argv += 2;
argc -= 2;
} else if (strcmp("-t", argv[1]) == 0) {
timestampstr = argv[2];
argv += 2;
argc -= 2;
} else if (strcmp("-l", argv[1]) == 0) {
listvars = 1;
argv += 1;
argc -= 1;
} else {
/* unrecognised option */
break;
}
}
if ((argc != 4 && !listvars) || (argc != 2 && listvars)) {
usage(progname);
exit(1);
}
/* copy to wchar16_t including trailing zero */
for (i = 0; i < strlen(argv[2]) + 1; i++)
var[i] = argv[2][i];
varlen = i*2; /* size of storage including zero */
if (!owner)
owner = get_owner_guid(argv[2]);
if (!owner) {
fprintf(stderr, "variable %s has no defined guid, one must be specified\n", argv[2]);
exit(1);
}
memset(×tamp, 0, sizeof(timestamp));
time_t t;
struct tm *tm, tms;
memset(&tms, 0, sizeof(tms));
if (timestampstr) {
strptime(timestampstr, "%Y-%m-%d %H:%M:%S", &tms);
tm = &tms;
} else {
time(&t);
tm = localtime(&t);
}
/* timestamp.Year is from 0 not 1900 as tm year is */
timestamp.Year = tm->tm_year + 1900;
/* timestamp Month is 1-12 not 0-11 as tm_mon is */
timestamp.Month = tm->tm_mon + 1;
timestamp.Day = tm->tm_mday;
timestamp.Hour = tm->tm_hour;
timestamp.Minute = tm->tm_min;
timestamp.Second = tm->tm_sec;
printf("Timestamp is %d-%d-%d %02d:%02d:%02d\n", timestamp.Year,
timestamp.Month, timestamp.Day, timestamp.Hour, timestamp.Minute,
timestamp.Second);
flashfile = open(argv[1], O_RDWR);
if (flashfile < 0) {
fprintf(stderr, "Failed to read file %s:", argv[1]);
perror("");
}
varfile = open(argv[3], O_RDONLY);
if (varfile < 0) {
fprintf(stderr, "Failed to read file %s:", argv[1]);
perror("");
}
fstat(varfile, &st);
varfilesize = st.st_size;
vardata = malloc(varfilesize);
if (read(varfile, vardata, varfilesize) != varfilesize) {
perror("Failed to read variable file");
exit(1);
}
close(varfile);
buf = malloc(sizeof(EFI_GUID));
for (i = 0; ; i += chunk) {
lseek(flashfile, i, SEEK_SET);
if (read(flashfile, buf, sizeof(EFI_GUID)) != sizeof(EFI_GUID))
goto eof;
if (memcmp(buf, &SECURE_VARIABLE_GUID, sizeof(EFI_GUID)) == 0)
break;
}
offset = i;
printf("Variable header found at offset 0x%x\n", offset);
lseek(flashfile, offset, SEEK_SET);
free(buf);
buf = malloc(sizeof(VARIABLE_STORE_HEADER));
read(flashfile, buf, sizeof(VARIABLE_STORE_HEADER));
VARIABLE_STORE_HEADER *vsh = (VARIABLE_STORE_HEADER *)buf;
if (vsh->Format != VARIABLE_STORE_FORMATTED &&
vsh->State != VARIABLE_STORE_HEALTHY) {
fprintf(stderr, "Variable store header is corrupt\n");
exit(1);
}
UINT32 size = vsh->Size;
free(buf);
buf = malloc(size);
lseek(flashfile, offset, SEEK_SET);
read(flashfile, buf, size);
vsh = (VARIABLE_STORE_HEADER *)buf;
printf("Variable Store Size = 0x%x\n", vsh->Size);
VARIABLE_HEADER *vh = (void *)HEADER_ALIGN(vsh + 1);
printf("variables begin at 0x%x\n", (int)((char *)vh - (char *)vsh));
for (i = 0; IsValidVariableHeader(vh); i++) {
vh = (void *)HEADER_ALIGN((char *)(vh + 1) + vh->NameSize + vh->DataSize);
}
printf("Found %d variables, now at offset %ld\n", i, (long)((char *)vh - (char *)vsh));
memset(vh, 0, sizeof(*vh));
vh->StartId = VARIABLE_DATA;
vh->State = VAR_ADDED;
vh->Attributes = attributes;
vh->NameSize = varlen;
vh->DataSize = varfilesize;
vh->TimeStamp = timestamp;
vh->VendorGuid = *owner;
buf = (void *)(vh + 1);
memcpy (buf, var, varlen);
buf += varlen;
memcpy (buf, vardata, varfilesize);
lseek(flashfile, offset, SEEK_SET);
write(flashfile, vsh, vsh->Size);
close(flashfile);
exit(0);
eof:
printf("No variables found in file at offset 0x%x\n", i);
exit(2);
}
|
