Mercurial > projects > pwm

comparison pw.c @ 12:8768fbd09bc5

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Add generatepassword command to generate random passwords Refactor and generalize handling of named arguments.
author Guido Berhoerster <guido+pwm@berhoerster.name>
date Thu, 03 Aug 2017 10:22:07 +0200
parents
children fa93d2ff9c62
comparison
equal deleted inserted replaced
11:85bce13237cf 12:8768fbd09bc5
1 /*
2 * Copyright (C) 2017 Guido Berhoerster <guido+pwm@berhoerster.name>
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included
13 * in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23
24 #include "compat.h"
25
26 #ifdef HAVE_ERR_H
27 #include <err.h>
28 #endif /* HAVE_ERR_H */
29 #include <pws.h>
30 #include <stdint.h>
31 #include <string.h>
32
33 #include "pw.h"
34 #include "rand.h"
35 #include "util.h"
36
37 int
38 pw_genrandom(struct pw_char_group groups[], size_t groups_len, char *password,
39 size_t password_len)
40 {
41 int retval = -1;
42 char *password_buf = NULL;
43 size_t *group_matches = NULL;
44 size_t i;
45 size_t chars_len = 0;
46 char *chars;
47 size_t j;
48 uint32_t r;
49 size_t k;
50
51 password_buf = xmalloc(password_len + 1);
52 password_buf[password_len] = '\0';
53
54 group_matches = xmalloc(groups_len * sizeof (size_t));
55
56 for (i = 0; i < groups_len; i++) {
57 chars_len += strlen(groups[i].chars);
58 }
59
60 chars = xmalloc(chars_len + 1);
61 chars[0] = '\0';
62 for (i = 0; i < groups_len; i++) {
63 strcat(chars, groups[i].chars);
64 }
65
66 for (k = 0; k < 100000; k++) {
67 memset(group_matches, 0, groups_len * sizeof (size_t));
68
69 for (j = 0; j < password_len; j++) {
70 r = rand_uniform(chars_len);
71 password_buf[j] = chars[r];
72
73 for (i = 0; i < groups_len; i++) {
74 if (strchr(groups[i].chars, chars[r]) != NULL) {
75 group_matches[i]++;
76 break;
77 }
78 }
79 }
80
81 for (i = 0; i < groups_len; i++) {
82 if (group_matches[i] < groups[i].chars_min) {
83 /* try again */
84 break;
85 }
86 }
87 if (i == groups_len) {
88 /* password meets all constraints */
89 strcpy(password, password_buf);
90 retval = 0;
91 break;
92 }
93 }
94
95 free(chars);
96 free(group_matches);
97 free(password_buf);
98
99 return (retval);
100 }