Annotation of src/usr.bin/passwd/pwd_gensalt.c, Revision 1.26
1.26 ! thib 1: /* $OpenBSD: pwd_gensalt.c,v 1.25 2006/04/02 04:13:08 deraadt Exp $ */
1.17 deraadt 2:
1.1 provos 3: /*
4: * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
1.2 provos 17: * This product includes software developed by Niels Provos.
1.1 provos 18: * 4. The name of the author may not be used to endorse or promote products
19: * derived from this software without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31: */
32:
1.7 provos 33: #include <sys/types.h>
1.1 provos 34: #include <stdio.h>
1.4 weingart 35: #include <stdlib.h>
1.1 provos 36: #include <string.h>
37: #include <err.h>
1.7 provos 38: #include <grp.h>
1.1 provos 39: #include <pwd.h>
1.4 weingart 40: #include <time.h>
1.10 millert 41: #include <login_cap.h>
1.1 provos 42:
1.25 deraadt 43: void to64(char *, u_int32_t, int n);
44: char *bcrypt_gensalt(u_int8_t);
45: int pwd_gensalt(char *, int, login_cap_t *, char);
1.1 provos 46:
1.20 millert 47: #define YPCIPHER_DEF "old"
48: #define LOCALCIPHER_DEF "blowfish,6"
49:
1.2 provos 50: int
1.18 millert 51: pwd_gensalt(char *salt, int saltlen, login_cap_t *lc, char type)
1.1 provos 52: {
1.21 otto 53: char *next, *now, *oldnext;
1.14 deraadt 54:
1.1 provos 55: *salt = '\0';
56:
57: switch (type) {
58: case 'y':
1.21 otto 59: next = login_getcapstr(lc, "ypcipher", NULL, NULL);
60: if (next == NULL && (next = strdup(YPCIPHER_DEF)) == NULL) {
61: warn(NULL);
62: return 0;
63: }
1.1 provos 64: break;
65: case 'l':
66: default:
1.21 otto 67: next = login_getcapstr(lc, "localcipher", NULL, NULL);
68: if (next == NULL && (next = strdup(LOCALCIPHER_DEF)) == NULL) {
69: warn(NULL);
70: return 0;
71: }
1.1 provos 72: break;
73: }
74:
1.21 otto 75: oldnext = next;
1.1 provos 76: now = strsep(&next, ",");
77: if (!strcmp(now, "old")) {
1.21 otto 78: if (saltlen < 3) {
79: free(oldnext);
1.2 provos 80: return 0;
1.21 otto 81: }
1.5 provos 82: to64(&salt[0], arc4random(), 2);
1.2 provos 83: salt[2] = '\0';
1.3 provos 84: } else if (!strcmp(now, "newsalt")) {
1.22 moritz 85: u_int32_t rounds = 7250;
1.14 deraadt 86:
1.22 moritz 87: if (next)
88: rounds = atol(next);
1.21 otto 89: if (saltlen < 10) {
90: free(oldnext);
1.3 provos 91: return 0;
1.21 otto 92: }
1.9 provos 93: /* Check rounds, 24 bit is max */
94: if (rounds < 7250)
95: rounds = 7250;
96: else if (rounds > 0xffffff)
1.14 deraadt 97: rounds = 0xffffff;
1.3 provos 98: salt[0] = _PASSWORD_EFMT1;
1.23 deraadt 99: to64(&salt[1], (u_int32_t)rounds, 4);
1.5 provos 100: to64(&salt[5], arc4random(), 4);
1.3 provos 101: salt[9] = '\0';
102: } else if (!strcmp(now, "md5")) {
1.21 otto 103: if (saltlen < 13) { /* $1$8salt$\0 */
104: free(oldnext);
1.3 provos 105: return 0;
1.21 otto 106: }
1.14 deraadt 107:
108: strlcpy(salt, "$1$", saltlen);
1.5 provos 109: to64(&salt[3], arc4random(), 4);
110: to64(&salt[7], arc4random(), 4);
1.16 deraadt 111: strlcpy(&salt[11], "$", saltlen - 11);
1.3 provos 112: } else if (!strcmp(now, "blowfish")) {
1.22 moritz 113: int rounds = 6;
1.14 deraadt 114:
1.22 moritz 115: if (next)
116: rounds = atoi(next);
1.3 provos 117: if (rounds < 4)
118: rounds = 4;
1.22 moritz 119: if (rounds > 31)
120: rounds = 31;
1.14 deraadt 121: strlcpy(salt, bcrypt_gensalt(rounds), saltlen);
1.3 provos 122: } else {
1.15 henning 123: warnx("Unknown option %s.", now);
1.22 moritz 124: free(oldnext);
125: return 0;
1.3 provos 126: }
1.21 otto 127: free(oldnext);
1.2 provos 128: return 1;
129: }
130:
1.6 deraadt 131: static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
132: "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
1.2 provos 133:
1.25 deraadt 134: void
1.24 deraadt 135: to64(char *s, u_int32_t v, int n)
1.2 provos 136: {
1.6 deraadt 137: while (--n >= 0) {
138: *s++ = itoa64[v&0x3f];
1.24 deraadt 139: v >>= 6;
1.6 deraadt 140: }
1.1 provos 141: }
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