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
|
/*
* Copyright 2012 <James.Bottomley@HansenPartnership.com>
*
* see COPYING file
*
* Update a secure varible when in secure mode
*
* For instance append a signature to the KEK, db or dbx datbases
*/
#include <efi.h>
#include <efilib.h>
#include <simple_file.h>
#include <guid.h>
#include <variables.h>
#include <shell.h>
#include "efiauthenticated.h"
EFI_STATUS
efi_main (EFI_HANDLE image, EFI_SYSTEM_TABLE *systab)
{
EFI_STATUS status;
int argc, i, esl_mode = 0, hash_mode = 0;
CHAR16 **ARGV, *var, *name, *progname, *owner_guid;
EFI_FILE *file;
void *buf;
UINTN size, options = 0;
EFI_GUID *owner;
CHAR16 **variables;
EFI_GUID **owners;
InitializeLib(image, systab);
if (GetOSIndications() & EFI_OS_INDICATIONS_TIMESTAMP_REVOCATION) {
variables = (CHAR16 *[]){ L"PK", L"KEK", L"db", L"dbx", L"dbt", L"MokList" , NULL};
owners = (EFI_GUID *[]){ &GV_GUID, &GV_GUID, &SIG_DB, &SIG_DB, &SIG_DB, &MOK_OWNER };
} else {
variables = (CHAR16 *[]){ L"PK", L"KEK", L"db", L"dbx", L"MokList" , NULL};
owners = (EFI_GUID *[]){ &GV_GUID, &GV_GUID, &SIG_DB, &SIG_DB, &MOK_OWNER };
}
status = argsplit(image, &argc, &ARGV);
if (status != EFI_SUCCESS) {
Print(L"Failed to parse arguments: %d\n", status);
return status;
}
progname = ARGV[0];
while (argc > 1 && ARGV[1][0] == L'-') {
if (StrCmp(ARGV[1], L"-a") == 0) {
options |= EFI_VARIABLE_APPEND_WRITE;
ARGV += 1;
argc -= 1;
} else if (StrCmp(ARGV[1], L"-g") == 0) {
owner_guid = ARGV[2];
ARGV += 2;
argc -= 2;
} else if (StrCmp(ARGV[1], L"-e") == 0) {
esl_mode = 1;
ARGV += 1;
argc -= 1;
} else if (StrCmp(ARGV[1], L"-b") == 0) {
esl_mode = 1;
hash_mode = 1;
ARGV += 1;
argc -= 1;
} else {
/* unrecognised option */
break;
}
}
if (argc != 3 ) {
Print(L"Usage: %s: [-g guid] [-a] [-e] [-b] var file\n", progname);
return EFI_INVALID_PARAMETER;
}
var = ARGV[1];
name = ARGV[2];
for(i = 0; variables[i] != NULL; i++) {
if (StrCmp(var, variables[i]) == 0) {
owner = owners[i];
break;
}
}
if (variables[i] == NULL) {
Print(L"Invalid Variable %s\nVariable must be one of: ", var);
for (i = 0; variables[i] != NULL; i++)
Print(L"%s ", variables[i]);
Print(L"\n");
return EFI_INVALID_PARAMETER;
}
if (owner == &MOK_OWNER) {
if (!esl_mode) {
Print(L"MoK variables can only be updated in ESL mode\n");
return EFI_INVALID_PARAMETER;
}
/* hack: esl goes directly into MoK variables, so we now
* pretend we have a direct .auth update */
esl_mode = 0;
} else {
/* non MoK variables have runtime access and time based
* authentication, MoK ones don't */
options |= EFI_VARIABLE_RUNTIME_ACCESS
| EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS;
}
status = simple_file_open(image, name, &file, EFI_FILE_MODE_READ);
if (status != EFI_SUCCESS) {
Print(L"Failed to open file %s\n", name);
return status;
}
status = simple_file_read_all(file, &size, &buf);
if (status != EFI_SUCCESS) {
Print(L"Failed to read file %s\n", name);
return status;
}
simple_file_close(file);
if (hash_mode) {
UINT8 hash[SHA256_DIGEST_SIZE];
status = sha256_get_pecoff_digest_mem(buf, size, hash);
if (status != EFI_SUCCESS) {
Print(L"Failed to get hash of %s\n", name);
return status;
}
status = variable_enroll_hash(var, *owner, hash);
} else if (esl_mode) {
status = SetSecureVariable(var, buf, size, *owner, options, 0);
} else {
status = RT->SetVariable(var, owner,
EFI_VARIABLE_NON_VOLATILE
| EFI_VARIABLE_BOOTSERVICE_ACCESS
| options,
size, buf);
}
if (status != EFI_SUCCESS) {
Print(L"Failed to update variable %s: %d\n", var, status);
return status;
}
return EFI_SUCCESS;
}
|
