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 #include <sys/types.h> 44 45 #include <ctype.h> 46 #include <stdint.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <time.h> 51 #include <unistd.h> 52 53 #include "chpass.h" 54 55 static const char *months[] = 56 { "January", "February", "March", "April", "May", "June", 57 "July", "August", "September", "October", "November", 58 "December", NULL }; 59 60 char * 61 ttoa(time_t tval) 62 { 63 struct tm *tp; 64 static char tbuf[50]; 65 66 if (tval) { 67 tp = localtime(&tval); 68 (void)sprintf(tbuf, "%s %d, %d", months[tp->tm_mon], 69 tp->tm_mday, tp->tm_year + 1900); 70 } 71 else 72 *tbuf = '\0'; 73 return (tbuf); 74 } 75 76 int 77 atot(char *p, time_t *store) 78 { 79 static struct tm *lt; 80 char *t; 81 const char **mp; 82 time_t tval; 83 int day, month, year; 84 85 if (!*p) { 86 *store = 0; 87 return (0); 88 } 89 if (!lt) { 90 unsetenv("TZ"); 91 (void)time(&tval); 92 lt = localtime(&tval); 93 } 94 if (!(t = strtok(p, " \t"))) 95 goto bad; 96 if (isdigit(*t)) { 97 month = atoi(t); 98 } else { 99 for (mp = months;; ++mp) { 100 if (!*mp) 101 goto bad; 102 if (!strncasecmp(*mp, t, 3)) { 103 month = mp - months + 1; 104 break; 105 } 106 } 107 } 108 if (!(t = strtok(NULL, " \t,")) || !isdigit(*t)) 109 goto bad; 110 day = atoi(t); 111 if (!(t = strtok(NULL, " \t,")) || !isdigit(*t)) 112 goto bad; 113 year = atoi(t); 114 if (day < 1 || day > 31 || month < 1 || month > 12) 115 goto bad; 116 /* Allow two digit years 1969-2068 */ 117 if (year < 69) 118 year += 2000; 119 else if (year < 100) 120 year += 1900; 121 if (year < 1969) 122 bad: return (1); 123 lt->tm_year = year - 1900; 124 lt->tm_mon = month - 1; 125 lt->tm_mday = day; 126 lt->tm_hour = 0; 127 lt->tm_min = 0; 128 lt->tm_sec = 0; 129 lt->tm_isdst = -1; 130 if ((tval = mktime(lt)) < 0) 131 return (1); 132 #ifndef __i386__ 133 /* 134 * PR227589: The pwd.db and spwd.db files store the change and expire 135 * dates as unsigned 32-bit ints which overflow in 2106, so larger 136 * values must be rejected until the introduction of a v5 password 137 * database. i386 has 32-bit time_t and so dates beyond y2038 are 138 * already rejected by mktime above. 139 */ 140 if (tval > UINT32_MAX) 141 return (1); 142 #endif 143 *store = tval; 144 return (0); 145 } 146 147 int 148 ok_shell(char *name) 149 { 150 char *p, *sh; 151 152 setusershell(); 153 while ((sh = getusershell())) { 154 if (!strcmp(name, sh)) { 155 endusershell(); 156 return (1); 157 } 158 /* allow just shell name, but use "real" path */ 159 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0) { 160 endusershell(); 161 return (1); 162 } 163 } 164 endusershell(); 165 return (0); 166 } 167 168 char * 169 dup_shell(char *name) 170 { 171 char *p, *sh, *ret; 172 173 setusershell(); 174 while ((sh = getusershell())) { 175 if (!strcmp(name, sh)) { 176 endusershell(); 177 return (strdup(name)); 178 } 179 /* allow just shell name, but use "real" path */ 180 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0) { 181 ret = strdup(sh); 182 endusershell(); 183 return (ret); 184 } 185 } 186 endusershell(); 187 return (NULL); 188 } 189