chpass/util.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-4-Clause
   3  *
   4  * Copyright (c) 1988, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  * Copyright (c) 2002 Networks Associates Technology, Inc.
   7  * All rights reserved.
   8  *
   9  * Portions of this software were developed for the FreeBSD Project by
  10  * ThinkSec AS and NAI Labs, the Security Research Division of Network
  11  * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
  12  * ("CBOSS"), as part of the DARPA CHATS research program.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  * 3. All advertising materials mentioning features or use of this software
  23  *    must display the following acknowledgement:
  24  *      This product includes software developed by the University of
  25  *      California, Berkeley and its contributors.
  26  * 4. Neither the name of the University nor the names of its contributors
  27  *    may be used to endorse or promote products derived from this software
  28  *    without specific prior written permission.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  31  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  34  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  35  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  36  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  38  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  39  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  40  * SUCH DAMAGE.
  41  */
  42
  43 #ifndef lint
  44 #if 0
  45 static char sccsid[] = "@(#)util.c      8.4 (Berkeley) 4/2/94";
  46 #endif
  47 #endif /* not lint */
  48 #include <sys/cdefs.h>
  49 __FBSDID("$FreeBSD$");
  50
  51 #include <sys/types.h>
  52
  53 #include <ctype.h>
  54 #include <stdint.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <time.h>
  59 #include <unistd.h>
  60
  61 #include "chpass.h"
  62
  63 static const char *months[] =
  64         { "January", "February", "March", "April", "May", "June",
  65           "July", "August", "September", "October", "November",
  66           "December", NULL };
  67
  68 char *
  69 ttoa(time_t tval)
  70 {
  71         struct tm *tp;
  72         static char tbuf[50];
  73
  74         if (tval) {
  75                 tp = localtime(&tval);
  76                 (void)sprintf(tbuf, "%s %d, %d", months[tp->tm_mon],
  77                     tp->tm_mday, tp->tm_year + 1900);
  78         }
  79         else
  80                 *tbuf = '\0';
  81         return (tbuf);
  82 }
  83
  84 int
  85 atot(char *p, time_t *store)
  86 {
  87         static struct tm *lt;
  88         char *t;
  89         const char **mp;
  90         time_t tval;
  91         int day, month, year;
  92
  93         if (!*p) {
  94                 *store = 0;
  95                 return (0);
  96         }
  97         if (!lt) {
  98                 unsetenv("TZ");
  99                 (void)time(&tval);
 100                 lt = localtime(&tval);
 101         }
 102         if (!(t = strtok(p, " \t")))
 103                 goto bad;
 104         if (isdigit(*t)) {
 105                 month = atoi(t);
 106         } else {
 107                 for (mp = months;; ++mp) {
 108                         if (!*mp)
 109                                 goto bad;
 110                         if (!strncasecmp(*mp, t, 3)) {
 111                                 month = mp - months + 1;
 112                                 break;
 113                         }
 114                 }
 115         }
 116         if (!(t = strtok(NULL, " \t,")) || !isdigit(*t))
 117                 goto bad;
 118         day = atoi(t);
 119         if (!(t = strtok(NULL, " \t,")) || !isdigit(*t))
 120                 goto bad;
 121         year = atoi(t);
 122         if (day < 1 || day > 31 || month < 1 || month > 12)
 123                 goto bad;
 124         /* Allow two digit years 1969-2068 */
 125         if (year < 69)
 126                 year += 2000;
 127         else if (year < 100)
 128                 year += 1900;
 129         if (year < 1969)
 130 bad:            return (1);
 131         lt->tm_year = year - 1900;
 132         lt->tm_mon = month - 1;
 133         lt->tm_mday = day;
 134         lt->tm_hour = 0;
 135         lt->tm_min = 0;
 136         lt->tm_sec = 0;
 137         lt->tm_isdst = -1;
 138         if ((tval = mktime(lt)) < 0)
 139                 return (1);
 140 #ifndef __i386__
 141         /*
 142          * PR227589: The pwd.db and spwd.db files store the change and expire
 143          * dates as unsigned 32-bit ints which overflow in 2106, so larger
 144          * values must be rejected until the introduction of a v5 password
 145          * database.  i386 has 32-bit time_t and so dates beyond y2038 are
 146          * already rejected by mktime above.
 147          */
 148         if (tval > UINT32_MAX)
 149                 return (1);
 150 #endif
 151         *store = tval;
 152         return (0);
 153 }
 154
 155 int
 156 ok_shell(char *name)
 157 {
 158         char *p, *sh;
 159
 160         setusershell();
 161         while ((sh = getusershell())) {
 162                 if (!strcmp(name, sh)) {
 163                         endusershell();
 164                         return (1);
 165                 }
 166                 /* allow just shell name, but use "real" path */
 167                 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0) {
 168                         endusershell();
 169                         return (1);
 170                 }
 171         }
 172         endusershell();
 173         return (0);
 174 }
 175
 176 char *
 177 dup_shell(char *name)
 178 {
 179         char *p, *sh, *ret;
 180
 181         setusershell();
 182         while ((sh = getusershell())) {
 183                 if (!strcmp(name, sh)) {
 184                         endusershell();
 185                         return (strdup(name));
 186                 }
 187                 /* allow just shell name, but use "real" path */
 188                 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0) {
 189                         ret = strdup(sh);
 190                         endusershell();
 191                         return (ret);
 192                 }
 193         }
 194         endusershell();
 195         return (NULL);
 196 }