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 #endif /* not lint */ 45 #include <sys/cdefs.h> 46 #include <sys/types.h> 47 48 #include <ctype.h> 49 #include <stdint.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <time.h> 54 #include <unistd.h> 55 56 #include "chpass.h" 57 58 static const char *months[] = 59 { "January", "February", "March", "April", "May", "June", 60 "July", "August", "September", "October", "November", 61 "December", NULL }; 62 63 char * 64 ttoa(time_t tval) 65 { 66 struct tm *tp; 67 static char tbuf[50]; 68 69 if (tval) { 70 tp = localtime(&tval); 71 (void)sprintf(tbuf, "%s %d, %d", months[tp->tm_mon], 72 tp->tm_mday, tp->tm_year + 1900); 73 } 74 else 75 *tbuf = '\0'; 76 return (tbuf); 77 } 78 79 int 80 atot(char *p, time_t *store) 81 { 82 static struct tm *lt; 83 char *t; 84 const char **mp; 85 time_t tval; 86 int day, month, year; 87 88 if (!*p) { 89 *store = 0; 90 return (0); 91 } 92 if (!lt) { 93 unsetenv("TZ"); 94 (void)time(&tval); 95 lt = localtime(&tval); 96 } 97 if (!(t = strtok(p, " \t"))) 98 goto bad; 99 if (isdigit(*t)) { 100 month = atoi(t); 101 } else { 102 for (mp = months;; ++mp) { 103 if (!*mp) 104 goto bad; 105 if (!strncasecmp(*mp, t, 3)) { 106 month = mp - months + 1; 107 break; 108 } 109 } 110 } 111 if (!(t = strtok(NULL, " \t,")) || !isdigit(*t)) 112 goto bad; 113 day = atoi(t); 114 if (!(t = strtok(NULL, " \t,")) || !isdigit(*t)) 115 goto bad; 116 year = atoi(t); 117 if (day < 1 || day > 31 || month < 1 || month > 12) 118 goto bad; 119 /* Allow two digit years 1969-2068 */ 120 if (year < 69) 121 year += 2000; 122 else if (year < 100) 123 year += 1900; 124 if (year < 1969) 125 bad: return (1); 126 lt->tm_year = year - 1900; 127 lt->tm_mon = month - 1; 128 lt->tm_mday = day; 129 lt->tm_hour = 0; 130 lt->tm_min = 0; 131 lt->tm_sec = 0; 132 lt->tm_isdst = -1; 133 if ((tval = mktime(lt)) < 0) 134 return (1); 135 #ifndef __i386__ 136 /* 137 * PR227589: The pwd.db and spwd.db files store the change and expire 138 * dates as unsigned 32-bit ints which overflow in 2106, so larger 139 * values must be rejected until the introduction of a v5 password 140 * database. i386 has 32-bit time_t and so dates beyond y2038 are 141 * already rejected by mktime above. 142 */ 143 if (tval > UINT32_MAX) 144 return (1); 145 #endif 146 *store = tval; 147 return (0); 148 } 149 150 int 151 ok_shell(char *name) 152 { 153 char *p, *sh; 154 155 setusershell(); 156 while ((sh = getusershell())) { 157 if (!strcmp(name, sh)) { 158 endusershell(); 159 return (1); 160 } 161 /* allow just shell name, but use "real" path */ 162 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0) { 163 endusershell(); 164 return (1); 165 } 166 } 167 endusershell(); 168 return (0); 169 } 170 171 char * 172 dup_shell(char *name) 173 { 174 char *p, *sh, *ret; 175 176 setusershell(); 177 while ((sh = getusershell())) { 178 if (!strcmp(name, sh)) { 179 endusershell(); 180 return (strdup(name)); 181 } 182 /* allow just shell name, but use "real" path */ 183 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0) { 184 ret = strdup(sh); 185 endusershell(); 186 return (ret); 187 } 188 } 189 endusershell(); 190 return (NULL); 191 } 192