1 /* $OpenBSD: check_expire.c,v 1.8 2004/04/20 23:21:23 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 <tzfile.h> 49 #include <login_cap.h> 50 #include <bsd_auth.h> 51 52 #include "util.h" 53 54 static char *pwd_update(const struct passwd *, const struct passwd *); 55 56 int 57 login_check_expire(FILE *back, struct passwd *pwd, char *class, int lastchance) 58 { 59 auth_session_t *as; 60 login_cap_t *lc; 61 quad_t dead, expire, warn; 62 char *p; 63 64 if ((as = auth_open()) == NULL) { 65 syslog(LOG_ERR, "failed to create auth session"); 66 return (1); 67 } 68 if (auth_setpwd(as, pwd) < 0) { 69 syslog(LOG_ERR, "failed to set pwd entry in auth session"); 70 return (1); 71 } 72 73 expire = auth_check_change(as); 74 auth_close(as); 75 76 if (expire != 0) { 77 fprintf(back, BI_VALUE " expire %qd\n", expire); 78 79 if (class == NULL) 80 class = pwd->pw_class; 81 82 if ((lc = login_getclass(class)) == NULL) { 83 dead = 0; 84 warn = 0; 85 } else { 86 dead = login_getcaptime(lc, "password-dead", 0, 0); 87 warn = login_getcaptime(lc, "password-warn", 88 2 * DAYSPERWEEK * SECSPERDAY, 89 2 * DAYSPERWEEK * SECSPERDAY); 90 if (dead < 0) { 91 syslog(LOG_ERR, "class %s password-dead is %qd", 92 lc->lc_class, dead); 93 dead = 0; 94 } 95 if (warn < 0) { 96 syslog(LOG_ERR, "class %s password-warn is %qd", 97 lc->lc_class, warn); 98 warn = 0; 99 } 100 } 101 login_close(lc); 102 103 /* 104 * If their password is dead (expired longer than 105 * password-dead) then just reject them. If it is 106 * expired but not dead yet, reject them with a 107 * PWEXPIRED so login knows they can still sort of 108 * get in. 109 */ 110 if (expire < -dead) { 111 syslog(LOG_WARNING, "%s: dead password", pwd->pw_name); 112 fprintf(back, BI_VALUE 113 " errormsg Your password has expired\n"); 114 fprintf(back, BI_REJECT "\n"); 115 return (1); 116 } 117 if (expire < 0) { 118 if (lastchance) { 119 struct passwd *npwd; 120 121 endpwent(); 122 123 /* 124 * Only let them play this game once. 125 * Set their password change time to 1. 126 * This will most certainly cause any 127 * expired password to be dead, as well. 128 */ 129 npwd = pw_dup(pwd); 130 npwd->pw_change = 1; 131 p = pwd_update(npwd, pwd); 132 memset(npwd->pw_passwd, 0, 133 strlen(npwd->pw_passwd)); 134 free(npwd); 135 if (p != NULL) { 136 fprintf(back, BI_VALUE " errormsg %s", 137 auth_mkvalue(p)); 138 fprintf(back, BI_REJECT "\n"); 139 return (1); 140 } 141 } 142 syslog(LOG_WARNING, "%s: expired password", pwd->pw_name); 143 fprintf(back, BI_VALUE 144 " errormsg Your password has expired\n"); 145 fprintf(back, BI_PWEXPIRED "\n"); 146 return (1); 147 } 148 149 /* 150 * If their password is not expired but is about to expire 151 * then warn them. 152 */ 153 if (expire <= warn) { 154 fprintf(back, BI_VALUE 155 " warnmsg Your password expires on %s\n", 156 ctime(&pwd->pw_change)); 157 } 158 } 159 return (0); 160 } 161 162 static char * 163 pwd_update(const struct passwd *pwd, const struct passwd *opwd) 164 { 165 int tfd, pfd; 166 167 pw_init(); 168 tfd = pw_lock(0); 169 if (tfd < 0) { 170 if (errno == EEXIST) 171 return("the passwd file is busy."); 172 else 173 return("can't open passwd temp file"); 174 } 175 176 pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0); 177 if (pfd < 0 || fcntl(pfd, F_SETFD, 1) == -1) { 178 pw_abort(); 179 return(strerror(errno)); 180 } 181 182 pw_copy(pfd, tfd, pwd, opwd); 183 if (pw_mkdb(pwd->pw_name, 0) < 0) { 184 pw_abort(); 185 return("unable to update password database"); 186 } 187 188 return(NULL); 189 } 190