summaryrefslogtreecommitdiffstats
path: root/common/password.c
blob: 4c33152dbe6a0a919816b9322286d4881ad9c701 (plain)
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
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
/*
 * Copyright (c) 2008-2010 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <common.h>
#include <password.h>
#include <errno.h>
#include <readkey.h>
#include <fs.h>
#include <fcntl.h>
#include <digest.h>
#include <malloc.h>
#include <xfuncs.h>
#include <clock.h>
#include <generated/passwd.h>

#if defined(CONFIG_PASSWD_SUM_MD5)
#define PASSWD_SUM "md5"
#elif defined(CONFIG_PASSWD_SUM_SHA1)
#define PASSWD_SUM "sha1"
#elif defined(CONFIG_PASSWD_SUM_SHA256)
#define PASSWD_SUM "sha256"
#endif

int password(unsigned char *passwd, size_t length, int flags, int timeout)
{
	unsigned char *buf = passwd;
	int pos = 0;
	unsigned char ch;
	uint64_t start;

	if (!passwd)
		return -EINVAL;

	start = get_time_ns();

	do {
		if (tstc()) {
			ch = getc();

			switch (ch) {
			case '\r':
			case '\n':
				*buf = '\0';
				puts("\r\n");
				return pos;
			case '\0':
			case '\t':
				continue;
			case CTL_CH('c'):
				passwd[0] = '\0';
				puts("\r\n");
				return 0;
			case CTL_CH('h'):
			case BB_KEY_DEL7:
			case BB_KEY_DEL:
				if (pos > 0) {
					if (flags & STAR)
						puts("\b \b");

					*buf = '\0';
					buf--;
					pos--;
				}
				continue;
			default:
				if (pos < length - 1) {
					if (flags & STAR)
						putchar('*');
					else if (flags & CLEAR)
						putchar(ch);

					*buf = ch;
					buf++;
					pos++;
				} else {
					if (flags & STAR)
						putchar('\a');
				}
			}
		}
	} while (!is_timeout(start, timeout * SECOND) || timeout == 0);

	return -1;
}
EXPORT_SYMBOL(password);

int is_passwd_default_enable(void)
{
	return strlen(default_passwd) > 0;
}
EXPORT_SYMBOL(is_passwd_default_enable);

int is_passwd_env_enable(void)
{
	int fd;

	fd = open(PASSWD_FILE, O_RDONLY);

	if (fd < 0)
		return 0;

	close(fd);

	return 1;
}
EXPORT_SYMBOL(is_passwd_env_enable);

int passwd_env_disable(void)
{
	return unlink(PASSWD_FILE);
}
EXPORT_SYMBOL(passwd_env_disable);

static unsigned char to_digit(unsigned char c)
{
	if (c >= '0' && c <= '9')
		c -= '0';
	else
		c -= 'a' - 10;

	return c;
}

static unsigned char to_hexa(unsigned char c)
{
	if (c < 10)
		c += '0';
	else
		c += 'a' - 10;

	return c;
}

int read_passwd(unsigned char *sum, size_t length)
{
	if (is_passwd_env_enable())
		return read_env_passwd(sum, length);
	else if (is_passwd_default_enable())
		return read_default_passwd(sum, length);
	else
		return -EINVAL;
}

int read_default_passwd(unsigned char *sum, size_t length)
{
	int i = 0;
	int len = strlen(default_passwd);
	unsigned char *buf = (unsigned char *)default_passwd;
	unsigned char c;

	if (!sum || length < 1)
		return -EINVAL;

	for (i = 0; i < len && length > 0; i++) {
		c = buf[i];
		i++;

		*sum = to_digit(c) << 4;

		c = buf[i];

		*sum |= to_digit(c);
		sum++;
		length--;
	}

	return 0;
}
EXPORT_SYMBOL(read_default_passwd);

int read_env_passwd(unsigned char *sum, size_t length)
{
	int fd;
	int ret = 0;
	unsigned char c;

	if (!sum && length < 1)
		return -EINVAL;

	fd = open(PASSWD_FILE, O_RDONLY);

	if (fd < 0)
		return fd;

	do {
		ret = read(fd, &c, sizeof(char));

		if (ret < 0)
			goto exit;

		*sum = to_digit(c) << 4;

		ret = read(fd, &c, sizeof(char));

		if (ret < 0)
			goto exit;

		*sum |= to_digit(c);
		sum++;
		length--;
	} while(length > 0);

exit:

	ret = 0;

	close(fd);

	return ret;
}
EXPORT_SYMBOL(read_env_passwd);

int write_env_passwd(unsigned char *sum, size_t length)
{
	int fd;
	unsigned char c;
	int ret = 0;

	if (!sum && length < 1)
		return -EINVAL;

	fd = open(PASSWD_DIR, O_RDONLY);

	if (fd < 0)
		mkdir(PASSWD_DIR, 644);

	close(fd);

	fd = open(PASSWD_FILE, O_WRONLY | O_CREAT, 600);

	if (fd < 0)
		return fd;

	do {
		c = to_hexa(*sum >> 4 & 0xf);

		ret = write(fd, &c, sizeof(unsigned char));

		if (ret < 0)
			goto exit;

		c = to_hexa(*sum & 0xf);

		ret = write(fd, &c, sizeof(unsigned char));

		if (ret < 0)
			goto exit;

		sum++;
		length--;
	} while(length > 0);

	ret = 0;

exit:
	close(fd);

	return ret;
}
EXPORT_SYMBOL(write_env_passwd);

static int __check_passwd(unsigned char* passwd, size_t length, int std)
{
	struct digest *d;
	unsigned char *passwd1_sum;
	unsigned char *passwd2_sum;
	int ret = 0;

	d = digest_alloc(PASSWD_SUM);

	passwd1_sum = calloc(digest_length(d), sizeof(unsigned char));

	if (!passwd1_sum)
		return -ENOMEM;

	passwd2_sum = calloc(digest_length(d), sizeof(unsigned char));

	if (!passwd2_sum) {
		ret = -ENOMEM;
		goto err1;
	}

	digest_init(d);

	digest_update(d, passwd, length);

	digest_final(d, passwd1_sum);

	if (std)
		ret = read_env_passwd(passwd2_sum, digest_length(d));
	else
		ret = read_default_passwd(passwd2_sum, digest_length(d));

	if (ret < 0)
		goto err2;

	if (strncmp(passwd1_sum, passwd2_sum, digest_length(d)) == 0)
		ret = 1;

err2:
	free(passwd2_sum);
err1:
	free(passwd1_sum);
	digest_free(d);

	return ret;
}

int check_default_passwd(unsigned char* passwd, size_t length)
{
	return __check_passwd(passwd, length, 0);
}
EXPORT_SYMBOL(check_default_passwd);

int check_env_passwd(unsigned char* passwd, size_t length)
{
	return __check_passwd(passwd, length, 1);
}
EXPORT_SYMBOL(check_env_passwd);

int check_passwd(unsigned char* passwd, size_t length)
{
	if (is_passwd_env_enable())
		return check_env_passwd(passwd, length);
	else if (is_passwd_default_enable())
		return check_default_passwd(passwd, length);
	else
		return -EINVAL;
}

int set_env_passwd(unsigned char* passwd, size_t length)
{
	struct digest *d;
	unsigned char *passwd_sum;
	int ret;

	d = digest_alloc(PASSWD_SUM);

	passwd_sum = calloc(digest_length(d), sizeof(unsigned char));

	if (!passwd_sum)
		return -ENOMEM;

	digest_init(d);

	digest_update(d, passwd, length);

	digest_final(d, passwd_sum);

	ret = write_env_passwd(passwd_sum, digest_length(d));

	free(passwd_sum);

	return ret;
}
EXPORT_SYMBOL(set_env_passwd);