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Annotation of src/usr.bin/passwd/pwd_gensalt.c, Revision 1.5

1.1       provos      1: /*
                      2:  * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  * 3. All advertising materials mentioning features or use of this software
                     14:  *    must display the following acknowledgement:
1.2       provos     15:  *      This product includes software developed by Niels Provos.
1.1       provos     16:  * 4. The name of the author may not be used to endorse or promote products
                     17:  *    derived from this software without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     20:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     21:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     22:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     23:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     24:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     25:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     26:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     27:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     28:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     29:  */
                     30:
1.2       provos     31: #include <sys/syslimits.h>
1.1       provos     32: #include <stdio.h>
1.4       weingart   33: #include <stdlib.h>
1.1       provos     34: #include <string.h>
                     35: #include <err.h>
                     36: #include <pwd.h>
1.2       provos     37: #include <util.h>
1.4       weingart   38: #include <time.h>
1.1       provos     39:
1.2       provos     40: void to64( char *, long, int n);
1.1       provos     41:
1.2       provos     42: int
1.1       provos     43: pwd_gensalt(salt, max, pwd, type)
                     44:        char   *salt;
                     45:        int     max;
                     46:        struct passwd *pwd;
                     47:        char    type;
                     48: {
                     49:        char   *bcrypt_gensalt __P((u_int8_t));
                     50:        char    option[LINE_MAX];
                     51:        char   *next, *now;
                     52:        *salt = '\0';
                     53:
                     54:        switch (type) {
                     55:        case 'y':
1.2       provos     56:                pw_getconf(option, LINE_MAX, pwd->pw_name, "ypcipher");
1.1       provos     57:                break;
                     58:        case 'l':
                     59:        default:
1.2       provos     60:                pw_getconf(option, LINE_MAX, pwd->pw_name, "localcipher");
1.1       provos     61:                break;
                     62:        }
                     63:
                     64:        next = option;
                     65:        now = strsep(&next, ",");
                     66:        if (!strcmp(now, "old")) {
1.2       provos     67:                if( max < 3 )
                     68:                        return 0;
1.5     ! provos     69:                to64(&salt[0], arc4random(), 2);
1.2       provos     70:                salt[2] = '\0';
1.3       provos     71:        } else if (!strcmp(now, "newsalt")) {
                     72:                if( max < 10 )
                     73:                        return 0;
                     74:                salt[0] = _PASSWORD_EFMT1;
                     75:                to64(&salt[1], (long) (29 * 25), 4);
1.5     ! provos     76:                to64(&salt[5], arc4random(), 4);
1.3       provos     77:                salt[9] = '\0';
                     78:        } else if (!strcmp(now, "md5")) {
                     79:                if( max < 13 )  /* $1$8salt$\0 */
                     80:                        return 0;
                     81:                strcpy(salt, "$1$");
1.5     ! provos     82:                to64(&salt[3], arc4random(), 4);
        !            83:                to64(&salt[7], arc4random(), 4);
1.3       provos     84:                strcpy(&salt[11], "$");
                     85:        } else if (!strcmp(now, "blowfish")) {
                     86:                int     rounds = atoi(next);
                     87:                if (rounds < 4)
                     88:                        rounds = 4;
                     89:                strncpy(salt, bcrypt_gensalt(rounds), max - 1);
                     90:                salt[max - 1] = 0;
                     91:        } else {
                     92:                strcpy(salt, ":");
                     93:                warnx("Unkown option %s.", now);
                     94:        }
1.2       provos     95:        return 1;
                     96: }
                     97:
                     98: static unsigned char itoa64[] =         /* 0 ... 63 => ascii - 64 */
                     99:         "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
                    100:
                    101: void to64(s, v, n)
                    102:         register char *s;
                    103:         register long v;
                    104:         register int n;
                    105: {
                    106:         while (--n >= 0) {
                    107:                 *s++ = itoa64[v&0x3f];
                    108:                 v >>= 6;
                    109:         }
1.1       provos    110: }