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homed: move homectl's recovery key generation/modhex code to src/shared/

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This allows us to later reuse the code to generate recovery keys for
traditional LUKS volumes, too and share the code.
This commit is contained in:
Lennart Poettering 2020-11-24 13:55:02 +01:00
parent 95231c7215
commit 73d874bacd
9 changed files with 58 additions and 68 deletions
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2
src/basic/meson.build
View File

@ -187,6 +187,8 @@ basic_sources = files('''
ratelimit.h
raw-clone.h
raw-reboot.h
recovery-key.c
recovery-key.h
replace-var.c
replace-var.h
rlimit-util.c

54
src/home/modhex.c → src/basic/recovery-key.c
View File

@ -1,10 +1,8 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include "modhex.h"
#include "macro.h"
#include "memory-util.h"
#include "random-util.h"
#include "recovery-key.h"
const char modhex_alphabet[16] = {
'c', 'b', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'n', 'r', 't', 'u', 'v'
@ -29,24 +27,24 @@ int normalize_recovery_key(const char *password, char **ret) {
l = strlen(password);
if (!IN_SET(l,
MODHEX_RAW_LENGTH*2, /* syntax without dashes */
MODHEX_FORMATTED_LENGTH-1)) /* syntax with dashes */
RECOVERY_KEY_MODHEX_RAW_LENGTH*2, /* syntax without dashes */
RECOVERY_KEY_MODHEX_FORMATTED_LENGTH-1)) /* syntax with dashes */
return -EINVAL;
mangled = new(char, MODHEX_FORMATTED_LENGTH);
mangled = new(char, RECOVERY_KEY_MODHEX_FORMATTED_LENGTH);
if (!mangled)
return -ENOMEM;
for (size_t i = 0, j = 0; i < MODHEX_RAW_LENGTH; i++) {
for (size_t i = 0, j = 0; i < RECOVERY_KEY_MODHEX_RAW_LENGTH; i++) {
size_t k;
int a, b;
if (l == MODHEX_RAW_LENGTH*2)
if (l == RECOVERY_KEY_MODHEX_RAW_LENGTH*2)
/* Syntax without dashes */
k = i * 2;
else {
/* Syntax with dashes */
assert(l == MODHEX_FORMATTED_LENGTH-1);
assert(l == RECOVERY_KEY_MODHEX_FORMATTED_LENGTH-1);
k = i * 2 + i / 4;
if (i > 0 && i % 4 == 0 && password[k-1] != '-')
@ -67,8 +65,42 @@ int normalize_recovery_key(const char *password, char **ret) {
mangled[j++] = '-';
}
mangled[MODHEX_FORMATTED_LENGTH-1] = 0;
mangled[RECOVERY_KEY_MODHEX_FORMATTED_LENGTH-1] = 0;
*ret = TAKE_PTR(mangled);
return 0;
}
int make_recovery_key(char **ret) {
_cleanup_(erase_and_freep) char *formatted = NULL;
_cleanup_(erase_and_freep) uint8_t *key = NULL;
int r;
assert(ret);
key = new(uint8_t, RECOVERY_KEY_MODHEX_RAW_LENGTH);
if (!key)
return -ENOMEM;
r = genuine_random_bytes(key, RECOVERY_KEY_MODHEX_RAW_LENGTH, RANDOM_BLOCK);
if (r < 0)
return r;
/* Let's now format it as 64 modhex chars, and after each 8 chars insert a dash */
formatted = new(char, RECOVERY_KEY_MODHEX_FORMATTED_LENGTH);
if (!formatted)
return -ENOMEM;
for (size_t i = 0, j = 0; i < RECOVERY_KEY_MODHEX_RAW_LENGTH; i++) {
formatted[j++] = modhex_alphabet[key[i] >> 4];
formatted[j++] = modhex_alphabet[key[i] & 0xF];
if (i % 4 == 3)
formatted[j++] = '-';
}
formatted[RECOVERY_KEY_MODHEX_FORMATTED_LENGTH-1] = 0;
*ret = TAKE_PTR(formatted);
return 0;
}

6
src/home/modhex.h → src/basic/recovery-key.h
View File

@ -2,10 +2,12 @@
#pragma once
/* 256 bit keys = 32 bytes */
#define MODHEX_RAW_LENGTH 32
#define RECOVERY_KEY_MODHEX_RAW_LENGTH 32
/* Formatted as sequences of 64 modhex characters, with dashes inserted after multiples of 8 chars (incl. trailing NUL) */
#define MODHEX_FORMATTED_LENGTH (MODHEX_RAW_LENGTH*2/8*9)
#define RECOVERY_KEY_MODHEX_FORMATTED_LENGTH (RECOVERY_KEY_MODHEX_RAW_LENGTH*2/8*9)
int make_recovery_key(char **ret);
extern const char modhex_alphabet[16];

38
src/home/homectl-recovery-key.c
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@ -5,46 +5,12 @@
#include "libcrypt-util.h"
#include "locale-util.h"
#include "memory-util.h"
#include "modhex.h"
#include "qrcode-util.h"
#include "random-util.h"
#include "recovery-key.h"
#include "strv.h"
#include "terminal-util.h"
static int make_recovery_key(char **ret) {
_cleanup_(erase_and_freep) char *formatted = NULL;
_cleanup_(erase_and_freep) uint8_t *key = NULL;
int r;
assert(ret);
key = new(uint8_t, MODHEX_RAW_LENGTH);
if (!key)
return log_oom();
r = genuine_random_bytes(key, MODHEX_RAW_LENGTH, RANDOM_BLOCK);
if (r < 0)
return log_error_errno(r, "Failed to gather entropy for recovery key: %m");
/* Let's now format it as 64 modhex chars, and after each 8 chars insert a dash */
formatted = new(char, MODHEX_FORMATTED_LENGTH);
if (!formatted)
return log_oom();
for (size_t i = 0, j = 0; i < MODHEX_RAW_LENGTH; i++) {
formatted[j++] = modhex_alphabet[key[i] >> 4];
formatted[j++] = modhex_alphabet[key[i] & 0xF];
if (i % 4 == 3)
formatted[j++] = '-';
}
formatted[MODHEX_FORMATTED_LENGTH-1] = 0;
*ret = TAKE_PTR(formatted);
return 0;
}
static int add_privileged(JsonVariant **v, const char *hashed) {
_cleanup_(json_variant_unrefp) JsonVariant *e = NULL, *w = NULL, *l = NULL;
int r;
@ -144,7 +110,7 @@ int identity_add_recovery_key(JsonVariant **v) {
/* First, let's generate a secret key */
r = make_recovery_key(&password);
if (r < 0)
return r;
return log_error_errno(r, "Failed to generate recovery key: %m");
/* Let's UNIX hash it */
r = hash_password(password, &hashed);

2
src/home/homework.c
View File

@ -21,9 +21,9 @@
#include "main-func.h"
#include "memory-util.h"
#include "missing_magic.h"
#include "modhex.h"
#include "mount-util.h"
#include "path-util.h"
#include "recovery-key.h"
#include "rm-rf.h"
#include "stat-util.h"
#include "strv.h"

16
src/home/meson.build
View File

@ -19,8 +19,6 @@ systemd_homework_sources = files('''
homework-quota.h
homework.c
homework.h
modhex.c
modhex.h
user-record-util.c
user-record-util.h
'''.split())
@ -52,8 +50,6 @@ systemd_homed_sources = files('''
homed-varlink.c
homed-varlink.h
homed.c
modhex.c
modhex.h
user-record-pwquality.c
user-record-pwquality.h
user-record-sign.c
@ -80,8 +76,6 @@ homectl_sources = files('''
homectl-recovery-key.c
homectl-recovery-key.h
homectl.c
modhex.c
modhex.h
user-record-pwquality.c
user-record-pwquality.h
user-record-util.c
@ -92,8 +86,6 @@ pam_systemd_home_sym = 'src/home/pam_systemd_home.sym'
pam_systemd_home_c = files('''
home-util.c
home-util.h
modhex.c
modhex.h
pam_systemd_home.c
user-record-util.c
user-record-util.h
@ -112,11 +104,3 @@ if conf.get('ENABLE_HOMED') == 1
install_dir : pkgsysconfdir)
endif
endif
tests += [
[['src/home/test-modhex.c',
'src/home/modhex.c',
'src/home/modhex.h'],
[],
[]],
]

2
src/home/user-record-util.c
View File

@ -7,7 +7,7 @@
#include "id128-util.h"
#include "libcrypt-util.h"
#include "memory-util.h"
#include "modhex.h"
#include "recovery-key.h"
#include "mountpoint-util.h"
#include "path-util.h"
#include "stat-util.h"

4
src/test/meson.build
View File

@ -212,6 +212,10 @@ tests += [
[],
[]],
[['src/test/test-modhex.c'],
[],
[]],
[['src/test/test-libmount.c'],
[],
[threads,

2
src/home/test-modhex.c → src/test/test-modhex.c
View File

@ -1,6 +1,6 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "modhex.h"
#include "recovery-key.h"
#include "alloc-util.h"
#include "string-util.h"