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
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <stdio.h>
#include <sys/stat.h>
#include "alloc-util.h"
#include "cryptsetup-util.h"
#include "fileio.h"
#include "hexdecoct.h"
#include "integrity-util.h"
#include "log.h"
#include "main-func.h"
#include "memory-util.h"
#include "parse-util.h"
#include "path-util.h"
#include "pretty-print.h"
#include "process-util.h"
#include "string-util.h"
#include "terminal-util.h"
static uint32_t arg_activate_flags;
static int arg_percent;
static usec_t arg_commit_time;
static char *arg_existing_data_device;
static char *arg_integrity_algorithm;
STATIC_DESTRUCTOR_REGISTER(arg_existing_data_device, freep);
STATIC_DESTRUCTOR_REGISTER(arg_integrity_algorithm, freep);
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-integritysetup@.service", "8", &link);
if (r < 0)
return log_oom();
printf("%s attach VOLUME DEVICE [HMAC_KEY_FILE|-] [OPTIONS]\n"
"%s detach VOLUME\n\n"
"Attach or detach an integrity protected block device.\n"
"\nSee the %s for details.\n",
program_invocation_short_name,
program_invocation_short_name,
link);
return 0;
}
static int load_key_file(
const char *key_file,
void **ret_key_file_contents,
size_t *ret_key_file_size) {
int r;
_cleanup_(erase_and_freep) char *tmp_key_file_contents = NULL;
size_t tmp_key_file_size;
if (!path_is_absolute(key_file))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "key file not absolute path: %s", key_file);
r = read_full_file_full(
AT_FDCWD, key_file, UINT64_MAX, DM_MAX_KEY_SIZE,
READ_FULL_FILE_SECURE|READ_FULL_FILE_WARN_WORLD_READABLE|READ_FULL_FILE_CONNECT_SOCKET|READ_FULL_FILE_FAIL_WHEN_LARGER,
NULL,
&tmp_key_file_contents, &tmp_key_file_size);
if (r < 0)
return log_error_errno(r, "Failed to process key file: %m");
if (ret_key_file_contents && ret_key_file_size) {
*ret_key_file_contents = TAKE_PTR(tmp_key_file_contents);
*ret_key_file_size = tmp_key_file_size;
}
return 0;
}
static const char *integrity_algorithm_select(const void *key_file_buf) {
/* To keep a bit of sanity for end users, the subset of integrity
algorithms we support will match what is used in integritysetup */
if (arg_integrity_algorithm) {
if (streq("hmac-sha256", arg_integrity_algorithm))
return DM_HMAC_256;
return arg_integrity_algorithm;
} else if (key_file_buf)
return DM_HMAC_256;
return "crc32c";
}
static int run(int argc, char *argv[]) {
_cleanup_(crypt_freep) struct crypt_device *cd = NULL;
char *verb, *volume;
int r;
if (argv_looks_like_help(argc, argv))
return help();
if (argc < 3)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "This program requires at least two arguments.");
verb = argv[1];
volume = argv[2];
log_setup();
cryptsetup_enable_logging(NULL);
umask(0022);
if (streq(verb, "attach")) {
/* attach name device optional_key_file optional_options */
crypt_status_info status;
_cleanup_(erase_and_freep) void *key_buf = NULL;
const char *device, *key_file, *options;
size_t key_buf_size = 0;
if (argc < 4)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "attach requires at least three arguments.");
if (argc > 6)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "attach has a maximum of five arguments.");
device = argv[3];
key_file = mangle_none(argc > 4 ? argv[4] : NULL);
options = mangle_none(argc > 5 ? argv[5] : NULL);
if (!filename_is_valid(volume))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Volume name '%s' is not valid.", volume);
if (key_file) {
r = load_key_file(key_file, &key_buf, &key_buf_size);
if (r < 0)
return r;
}
if (options) {
r = parse_integrity_options(options, &arg_activate_flags, &arg_percent,
&arg_commit_time, &arg_existing_data_device, &arg_integrity_algorithm);
if (r < 0)
return r;
}
r = crypt_init(&cd, device);
if (r < 0)
return log_error_errno(r, "Failed to open integrity device %s: %m", device);
cryptsetup_enable_logging(cd);
status = crypt_status(cd, volume);
if (IN_SET(status, CRYPT_ACTIVE, CRYPT_BUSY)) {
log_info("Volume %s already active.", volume);
return 0;
}
r = crypt_load(cd,
CRYPT_INTEGRITY,
&(struct crypt_params_integrity) {
.journal_watermark = arg_percent,
.journal_commit_time = DIV_ROUND_UP(arg_commit_time, USEC_PER_SEC),
.integrity = integrity_algorithm_select(key_buf),
});
if (r < 0)
return log_error_errno(r, "Failed to load integrity superblock: %m");
if (!isempty(arg_existing_data_device)) {
r = crypt_set_data_device(cd, arg_existing_data_device);
if (r < 0)
return log_error_errno(r, "Failed to add separate data device: %m");
}
r = crypt_activate_by_volume_key(cd, volume, key_buf, key_buf_size, arg_activate_flags);
if (r < 0)
return log_error_errno(r, "Failed to set up integrity device: %m");
} else if (streq(verb, "detach")) {
if (argc > 3)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "detach has a maximum of two arguments.");
if (!filename_is_valid(volume))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Volume name '%s' is not valid.", volume);
r = crypt_init_by_name(&cd, volume);
if (r == -ENODEV) {
log_info("Volume %s already inactive.", volume);
return 0;
}
if (r < 0)
return log_error_errno(r, "crypt_init_by_name() failed: %m");
cryptsetup_enable_logging(cd);
r = crypt_deactivate(cd, volume);
if (r < 0)
return log_error_errno(r, "Failed to deactivate: %m");
} else
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown verb %s.", verb);
return 0;
}
DEFINE_MAIN_FUNCTION(run);
|
