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 #include <sys/types.h> 50 51 #include <ctype.h> 52 #include <stdint.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <time.h> 57 #include <unistd.h> 58 59 #include "chpass.h" 60 61 static const char *months[] = 62 { "January", "February", "March", "April", "May", "June", 63 "July", "August", "September", "October", "November", 64 "December", NULL }; 65 66 char * 67 ttoa(time_t tval) 68 { 69 struct tm *tp; 70 static char tbuf[50]; 71 72 if (tval) { 73 tp = localtime(&tval); 74 (void)sprintf(tbuf, "%s %d, %d", months[tp->tm_mon], 75 tp->tm_mday, tp->tm_year + 1900); 76 } 77 else 78 *tbuf = '\0'; 79 return (tbuf); 80 } 81 82 int 83 atot(char *p, time_t *store) 84 { 85 static struct tm *lt; 86 char *t; 87 const char **mp; 88 time_t tval; 89 int day, month, year; 90 91 if (!*p) { 92 *store = 0; 93 return (0); 94 } 95 if (!lt) { 96 unsetenv("TZ"); 97 (void)time(&tval); 98 lt = localtime(&tval); 99 } 100 if (!(t = strtok(p, " \t"))) 101 goto bad; 102 if (isdigit(*t)) { 103 month = atoi(t); 104 } else { 105 for (mp = months;; ++mp) { 106 if (!*mp) 107 goto bad; 108 if (!strncasecmp(*mp, t, 3)) { 109 month = mp - months + 1; 110 break; 111 } 112 } 113 } 114 if (!(t = strtok(NULL, " \t,")) || !isdigit(*t)) 115 goto bad; 116 day = atoi(t); 117 if (!(t = strtok(NULL, " \t,")) || !isdigit(*t)) 118 goto bad; 119 year = atoi(t); 120 if (day < 1 || day > 31 || month < 1 || month > 12) 121 goto bad; 122 /* Allow two digit years 1969-2068 */ 123 if (year < 69) 124 year += 2000; 125 else if (year < 100) 126 year += 1900; 127 if (year < 1969) 128 bad: return (1); 129 lt->tm_year = year - 1900; 130 lt->tm_mon = month - 1; 131 lt->tm_mday = day; 132 lt->tm_hour = 0; 133 lt->tm_min = 0; 134 lt->tm_sec = 0; 135 lt->tm_isdst = -1; 136 if ((tval = mktime(lt)) < 0) 137 return (1); 138 #ifndef __i386__ 139 /* 140 * PR227589: The pwd.db and spwd.db files store the change and expire 141 * dates as unsigned 32-bit ints which overflow in 2106, so larger 142 * values must be rejected until the introduction of a v5 password 143 * database. i386 has 32-bit time_t and so dates beyond y2038 are 144 * already rejected by mktime above. 145 */ 146 if (tval > UINT32_MAX) 147 return (1); 148 #endif 149 *store = tval; 150 return (0); 151 } 152 153 int 154 ok_shell(char *name) 155 { 156 char *p, *sh; 157 158 setusershell(); 159 while ((sh = getusershell())) { 160 if (!strcmp(name, sh)) { 161 endusershell(); 162 return (1); 163 } 164 /* allow just shell name, but use "real" path */ 165 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0) { 166 endusershell(); 167 return (1); 168 } 169 } 170 endusershell(); 171 return (0); 172 } 173 174 char * 175 dup_shell(char *name) 176 { 177 char *p, *sh, *ret; 178 179 setusershell(); 180 while ((sh = getusershell())) { 181 if (!strcmp(name, sh)) { 182 endusershell(); 183 return (strdup(name)); 184 } 185 /* allow just shell name, but use "real" path */ 186 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0) { 187 ret = strdup(sh); 188 endusershell(); 189 return (ret); 190 } 191 } 192 endusershell(); 193 return (NULL); 194 } 195