granicus.if.org Git - linux-pam/blob - modules/pam_unix/pam_unix_acct.c

   1 /*
   2  * Copyright Elliot Lee, 1996.  All rights reserved.
   3  * Copyright Jan Rêkorajski, 1999.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, and the entire permission notice in its entirety,
  10  *    including the disclaimer of warranties.
  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. The name of the author may not be used to endorse or promote
  15  *    products derived from this software without specific prior
  16  *    written permission.
  17  *
  18  * ALTERNATIVELY, this product may be distributed under the terms of
  19  * the GNU Public License, in which case the provisions of the GPL are
  20  * required INSTEAD OF the above restrictions.  (This clause is
  21  * necessary due to a potential bad interaction between the GPL and
  22  * the restrictions contained in a BSD-style copyright.)
  23  *
  24  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  25  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  26  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  27  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  28  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  29  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  30  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  32  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  34  * OF THE POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include <security/_pam_aconf.h>
  38
  39 #include <stdlib.h>
  40 #include <stdio.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43 #include <sys/types.h>
  44 #include <syslog.h>
  45 #include <pwd.h>
  46 #include <shadow.h>
  47 #include <time.h>               /* for time() */
  48
  49 #include <security/_pam_macros.h>
  50
  51 /* indicate that the following groups are defined */
  52
  53 #define PAM_SM_ACCOUNT
  54
  55 #include <security/pam_modules.h>
  56
  57 #ifndef LINUX_PAM
  58 #include <security/pam_appl.h>
  59 #endif                          /* LINUX_PAM */
  60
  61 #include "support.h"
  62
  63 /*
  64  * PAM framework looks for this entry-point to pass control to the
  65  * account management module.
  66  */
  67
  68 PAM_EXTERN int pam_sm_acct_mgmt(pam_handle_t * pamh, int flags,
  69                                 int argc, const char **argv)
  70 {
  71         unsigned int ctrl;
  72         const char *uname;
  73         int retval, daysleft;
  74         time_t curdays;
  75         struct spwd *spent;
  76         struct passwd *pwent;
  77         char buf[80];
  78
  79         D(("called."));
  80
  81         ctrl = _set_ctrl(flags, NULL, argc, argv);
  82
  83         retval = pam_get_item(pamh, PAM_USER, (const void **) &uname);
  84         D(("user = `%s'", uname));
  85         if (retval != PAM_SUCCESS || uname == NULL) {
  86                 _log_err(LOG_ALERT
  87                          ,"could not identify user (from uid=%d)"
  88                          ,getuid());
  89                 return PAM_USER_UNKNOWN;
  90         }
  91
  92         pwent = getpwnam(uname);
  93         if (!pwent) {
  94                 _log_err(LOG_ALERT
  95                          ,"could not identify user (from getpwnam(%s))"
  96                          ,uname);
  97                 return PAM_USER_UNKNOWN;
  98         }
  99
 100         if (!strcmp( pwent->pw_passwd, "*NP*" )) { /* NIS+ */
 101                 uid_t save_euid, save_uid;
 102
 103                 save_euid = geteuid();
 104                 save_uid = getuid();
 105                 if (save_uid == pwent->pw_uid)
 106                         setreuid( save_euid, save_uid );
 107                 else  {
 108                         setreuid( 0, -1 );
 109                         if (setreuid( -1, pwent->pw_uid ) == -1) {
 110                                 setreuid( -1, 0 );
 111                                 setreuid( 0, -1 );
 112                                 if(setreuid( -1, pwent->pw_uid ) == -1)
 113                                         return PAM_CRED_INSUFFICIENT;
 114                         }
 115                 }
 116                 spent = getspnam( uname );
 117                 if (save_uid == pwent->pw_uid)
 118                         setreuid( save_uid, save_euid );
 119                 else {
 120                         if (setreuid( -1, 0 ) == -1)
 121                         setreuid( save_uid, -1 );
 122                         setreuid( -1, save_euid );
 123                 }
 124
 125         } else if (!strcmp( pwent->pw_passwd, "x" )) {
 126                 spent = getspnam(uname);
 127         } else {
 128                 return PAM_SUCCESS;
 129         }
 130
 131         if (!spent)
 132                 return PAM_AUTHINFO_UNAVAIL;    /* Couldn't get username from shadow */
 133
 134         curdays = time(NULL) / (60 * 60 * 24);
 135         D(("today is %d, last change %d", curdays, spent->sp_lstchg));
 136         if ((curdays > spent->sp_expire) && (spent->sp_expire != -1)
 137             && (spent->sp_lstchg != 0)) {
 138                 _log_err(LOG_NOTICE
 139                          ,"account %s has expired (account expired)"
 140                          ,uname);
 141                 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
 142                             "Your account has expired; please contact your system administrator");
 143                 D(("account expired"));
 144                 return PAM_ACCT_EXPIRED;
 145         }
 146         if ((curdays > (spent->sp_lstchg + spent->sp_max + spent->sp_inact))
 147             && (spent->sp_max != -1) && (spent->sp_inact != -1)
 148             && (spent->sp_lstchg != 0)) {
 149                 _log_err(LOG_NOTICE
 150                     ,"account %s has expired (failed to change password)"
 151                          ,uname);
 152                 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
 153                             "Your account has expired; please contact your system administrator");
 154                 D(("account expired 2"));
 155                 return PAM_ACCT_EXPIRED;
 156         }
 157         D(("when was the last change"));
 158         if (spent->sp_lstchg == 0) {
 159                 _log_err(LOG_NOTICE
 160                          ,"expired password for user %s (root enforced)"
 161                          ,uname);
 162                 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
 163                             "You are required to change your password immediately (root enforced)");
 164                 D(("need a new password"));
 165                 return PAM_NEW_AUTHTOK_REQD;
 166         }
 167         if (((spent->sp_lstchg + spent->sp_max) < curdays) && (spent->sp_max != -1)) {
 168                 _log_err(LOG_DEBUG
 169                          ,"expired password for user %s (password aged)"
 170                          ,uname);
 171                 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
 172                             "You are required to change your password immediately (password aged)");
 173                 D(("need a new password 2"));
 174                 return PAM_NEW_AUTHTOK_REQD;
 175         }
 176         if ((curdays > (spent->sp_lstchg + spent->sp_max - spent->sp_warn))
 177             && (spent->sp_max != -1) && (spent->sp_warn != -1)) {
 178                 daysleft = (spent->sp_lstchg + spent->sp_max) - curdays;
 179                 _log_err(LOG_DEBUG
 180                          ,"password for user %s will expire in %d days"
 181                          ,uname, daysleft);
 182                 snprintf(buf, 80, "Warning: your password will expire in %d day%.2s",
 183                          daysleft, daysleft == 1 ? "" : "s");
 184                 _make_remark(pamh, ctrl, PAM_TEXT_INFO, buf);
 185         }
 186
 187         D(("all done"));
 188
 189         return PAM_SUCCESS;
 190 }
 191
 192
 193 /* static module data */
 194 #ifdef PAM_STATIC
 195 struct pam_module _pam_unix_acct_modstruct = {
 196     "pam_unix_acct",
 197     NULL,
 198     NULL,
 199     pam_sm_acct_mgmt,
 200     NULL,
 201     NULL,
 202     NULL,
 203 };
 204 #endif