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
|
#define TAG "ext4_utils"
#include "ext4_crypt.h"
#include <string>
#include <fstream>
#include <map>
#include <errno.h>
#include <sys/mount.h>
#include <cutils/klog.h>
#include <cutils/properties.h>
#include "unencrypted_properties.h"
namespace {
std::map<std::string, std::string> s_password_store;
}
bool e4crypt_non_default_key(const char* dir)
{
int type = e4crypt_get_password_type(dir);
// ext4enc:TODO Use consts, not 1 here
return type != -1 && type != 1;
}
int e4crypt_get_password_type(const char* path)
{
UnencryptedProperties props(path);
if (props.Get<std::string>(properties::key).empty()) {
KLOG_INFO(TAG, "No master key, so not ext4enc\n");
return -1;
}
return props.Get<int>(properties::type, 1);
}
int e4crypt_change_password(const char* path, int crypt_type,
const char* password)
{
// ext4enc:TODO Encrypt master key with password securely. Store hash of
// master key for validation
UnencryptedProperties props(path);
if ( props.Set(properties::password, password)
&& props.Set(properties::type, crypt_type))
return 0;
return -1;
}
int e4crypt_crypto_complete(const char* path)
{
KLOG_INFO(TAG, "ext4 crypto complete called on %s\n", path);
if (UnencryptedProperties(path).Get<std::string>(properties::key).empty()) {
KLOG_INFO(TAG, "No master key, so not ext4enc\n");
return -1;
}
return 0;
}
int e4crypt_check_passwd(const char* path, const char* password)
{
UnencryptedProperties props(path);
if (props.Get<std::string>(properties::key).empty()) {
KLOG_INFO(TAG, "No master key, so not ext4enc\n");
return -1;
}
auto actual_password = props.Get<std::string>(properties::password);
if (actual_password == password) {
s_password_store[path] = password;
return 0;
} else {
return -1;
}
}
int e4crypt_restart(const char* path)
{
int rc = 0;
KLOG_INFO(TAG, "ext4 restart called on %s\n", path);
property_set("vold.decrypt", "trigger_reset_main");
KLOG_INFO(TAG, "Just asked init to shut down class main\n");
sleep(2);
std::string tmp_path = std::string() + path + "/tmp_mnt";
// ext4enc:TODO add retry logic
rc = umount(tmp_path.c_str());
if (rc) {
KLOG_ERROR(TAG, "umount %s failed with rc %d, msg %s\n",
tmp_path.c_str(), rc, strerror(errno));
return rc;
}
// ext4enc:TODO add retry logic
rc = umount(path);
if (rc) {
KLOG_ERROR(TAG, "umount %s failed with rc %d, msg %s\n",
path, rc, strerror(errno));
return rc;
}
return 0;
}
const char* e4crypt_get_password(const char* path)
{
// ext4enc:TODO scrub password after timeout
auto i = s_password_store.find(path);
if (i == s_password_store.end()) {
return 0;
} else {
return i->second.c_str();
}
}
|
