Annotation of src/usr.bin/passwd/pwd_gensalt.c, Revision 1.18
1.18 ! millert 1: /* $OpenBSD: pwd_gensalt.c,v 1.17 2003/07/02 21:04:10 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:
1.2 provos 33: #include <sys/syslimits.h>
1.7 provos 34: #include <sys/types.h>
1.1 provos 35: #include <stdio.h>
1.4 weingart 36: #include <stdlib.h>
1.1 provos 37: #include <string.h>
38: #include <err.h>
1.7 provos 39: #include <grp.h>
1.1 provos 40: #include <pwd.h>
1.4 weingart 41: #include <time.h>
1.10 millert 42: #include <login_cap.h>
1.1 provos 43:
1.14 deraadt 44: void to64(char *, int32_t, int n);
45: char *bcrypt_gensalt(u_int8_t);
1.18 ! millert 46: int pwd_gensalt(char *, int, login_cap_t *, char);
1.1 provos 47:
1.2 provos 48: int
1.18 ! millert 49: pwd_gensalt(char *salt, int saltlen, login_cap_t *lc, char type)
1.1 provos 50: {
1.14 deraadt 51: char option[LINE_MAX], *next, *now, *cipher;
52:
1.18 ! millert 53: option[0] = '\0';
1.1 provos 54: *salt = '\0';
55:
56: switch (type) {
57: case 'y':
1.14 deraadt 58: cipher = "ypcipher";
1.1 provos 59: break;
60: case 'l':
61: default:
1.14 deraadt 62: cipher = "localcipher";
1.1 provos 63: break;
1.7 provos 64: }
65:
1.10 millert 66: /*
1.18 ! millert 67: * Check login.conf
1.10 millert 68: */
69: if ((next = login_getcapstr(lc, cipher, NULL, NULL)) != NULL) {
70: strlcpy(option, next, sizeof(option));
71: free(next);
1.18 ! millert 72: }
1.10 millert 73:
1.18 ! millert 74: if (*option == 0) {
! 75: if (type == 'l')
! 76: strlcpy(option, "old", sizeof(option));
! 77: else
! 78: strlcpy(option, "blowfish,6", sizeof(option));
1.1 provos 79: }
80:
81: next = option;
82: now = strsep(&next, ",");
83: if (!strcmp(now, "old")) {
1.14 deraadt 84: if (saltlen < 3)
1.2 provos 85: return 0;
1.5 provos 86: to64(&salt[0], arc4random(), 2);
1.2 provos 87: salt[2] = '\0';
1.3 provos 88: } else if (!strcmp(now, "newsalt")) {
1.8 provos 89: u_int32_t rounds = atol(next);
1.14 deraadt 90:
91: if (saltlen < 10)
1.3 provos 92: return 0;
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;
1.8 provos 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")) {
1.14 deraadt 103: if (saltlen < 13) /* $1$8salt$\0 */
1.3 provos 104: return 0;
1.14 deraadt 105:
106: strlcpy(salt, "$1$", saltlen);
1.5 provos 107: to64(&salt[3], arc4random(), 4);
108: to64(&salt[7], arc4random(), 4);
1.16 deraadt 109: strlcpy(&salt[11], "$", saltlen - 11);
1.3 provos 110: } else if (!strcmp(now, "blowfish")) {
1.14 deraadt 111: int rounds = atoi(next);
112:
1.3 provos 113: if (rounds < 4)
114: rounds = 4;
1.14 deraadt 115: strlcpy(salt, bcrypt_gensalt(rounds), saltlen);
1.3 provos 116: } else {
1.14 deraadt 117: strlcpy(salt, ":", saltlen);
1.15 henning 118: warnx("Unknown option %s.", now);
1.3 provos 119: }
1.2 provos 120: return 1;
121: }
122:
1.6 deraadt 123: static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
124: "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
1.2 provos 125:
1.6 deraadt 126: void
1.14 deraadt 127: to64(char *s, int32_t v, int n)
1.2 provos 128: {
1.6 deraadt 129: while (--n >= 0) {
130: *s++ = itoa64[v&0x3f];
131: v >>= 6;
132: }
1.1 provos 133: }
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