1 /* $OpenBSD: check_expire.c,v 1.11 2015/03/15 00:41:27 millert Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Berkeley Software Design, 17 * Inc. 18 * 4. The name of Berkeley Software Design, Inc. may not be used to endorse 19 * or promote products derived from this software without specific prior 20 * written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN, INC. ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN, INC. BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * BSDI $From: check_expire.c,v 2.1 1997/08/08 18:38:25 prb Exp $ 35 */ 36 37 #include <sys/types.h> 38 39 #include <errno.h> 40 #include <fcntl.h> 41 #include <pwd.h> 42 #include <signal.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <syslog.h> 47 #include <time.h> 48 #include <login_cap.h> 49 #include <bsd_auth.h> 50 51 #include "util.h" 52 53 static char *pwd_update(const struct passwd *, const struct passwd *); 54 55 #define SECSPERDAY (24 * 60 * 60) 56 #define TWOWEEKS (2 * 7 * SECSPERDAY) 57 58 int 59 login_check_expire(FILE *back, struct passwd *pwd, char *class, int lastchance) 60 { 61 auth_session_t *as; 62 login_cap_t *lc; 63 quad_t dead, expire, warn; 64 char *p; 65 66 if ((as = auth_open()) == NULL) { 67 syslog(LOG_ERR, "failed to create auth session"); 68 return (1); 69 } 70 if (auth_setpwd(as, pwd) < 0) { 71 syslog(LOG_ERR, "failed to set pwd entry in auth session"); 72 return (1); 73 } 74 75 expire = auth_check_change(as); 76 auth_close(as); 77 78 if (expire != 0) { 79 fprintf(back, BI_VALUE " expire %qd\n", expire); 80 81 if (class == NULL) 82 class = pwd->pw_class; 83 84 if ((lc = login_getclass(class)) == NULL) { 85 dead = 0; 86 warn = 0; 87 } else { 88 dead = login_getcaptime(lc, "password-dead", 0, 0); 89 warn = login_getcaptime(lc, "password-warn", 90 TWOWEEKS, TWOWEEKS); 91 if (dead < 0) { 92 syslog(LOG_ERR, "class %s password-dead is %qd", 93 lc->lc_class, dead); 94 dead = 0; 95 } 96 if (warn < 0) { 97 syslog(LOG_ERR, "class %s password-warn is %qd", 98 lc->lc_class, warn); 99 warn = 0; 100 } 101 } 102 login_close(lc); 103 104 /* 105 * If their password is dead (expired longer than 106 * password-dead) then just reject them. If it is 107 * expired but not dead yet, reject them with a 108 * PWEXPIRED so login knows they can still sort of 109 * get in. 110 */ 111 if (expire < -dead) { 112 syslog(LOG_WARNING, "%s: dead password", pwd->pw_name); 113 fprintf(back, BI_VALUE 114 " errormsg Your password has expired\n"); 115 fprintf(back, BI_REJECT "\n"); 116 return (1); 117 } 118 if (expire < 0) { 119 if (lastchance) { 120 struct passwd *npwd; 121 122 endpwent(); 123 124 /* 125 * Only let them play this game once. 126 * Set their password change time to 1. 127 * This will most certainly cause any 128 * expired password to be dead, as well. 129 */ 130 npwd = pw_dup(pwd); 131 npwd->pw_change = 1; 132 p = pwd_update(npwd, pwd); 133 explicit_bzero(npwd->pw_passwd, 134 strlen(npwd->pw_passwd)); 135 free(npwd); 136 if (p != NULL) { 137 fprintf(back, BI_VALUE " errormsg %s", 138 auth_mkvalue(p)); 139 fprintf(back, BI_REJECT "\n"); 140 return (1); 141 } 142 } 143 syslog(LOG_WARNING, "%s: expired password", pwd->pw_name); 144 fprintf(back, BI_VALUE 145 " errormsg Your password has expired\n"); 146 fprintf(back, BI_PWEXPIRED "\n"); 147 return (1); 148 } 149 150 /* 151 * If their password is not expired but is about to expire 152 * then warn them. 153 */ 154 if (expire <= warn) { 155 fprintf(back, BI_VALUE 156 " warnmsg Your password expires on %s\n", 157 ctime(&pwd->pw_change)); 158 } 159 } 160 return (0); 161 } 162 163 static char * 164 pwd_update(const struct passwd *pwd, const struct passwd *opwd) 165 { 166 int tfd, pfd; 167 168 pw_init(); 169 tfd = pw_lock(0); 170 if (tfd < 0) { 171 if (errno == EEXIST) 172 return("the passwd file is busy."); 173 else 174 return("can't open passwd temp file"); 175 } 176 177 pfd = open(_PATH_MASTERPASSWD, O_RDONLY|O_CLOEXEC, 0); 178 if (pfd < 0) { 179 pw_abort(); 180 return(strerror(errno)); 181 } 182 183 pw_copy(pfd, tfd, pwd, opwd); 184 if (pw_mkdb(pwd->pw_name, 0) < 0) { 185 pw_abort(); 186 return("unable to update password database"); 187 } 188 189 return(NULL); 190 } 191