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 #include <security/_pam_modutil.h>
  57
  58 #ifndef LINUX_PAM
  59 #include <security/pam_appl.h>
  60 #endif                          /* LINUX_PAM */
  61
  62 #include "support.h"
  63
  64 /*
  65  * PAM framework looks for this entry-point to pass control to the
  66  * account management module.
  67  */
  68
  69 PAM_EXTERN int pam_sm_acct_mgmt(pam_handle_t * pamh, int flags,
  70                                 int argc, const char **argv)
  71 {
  72         unsigned int ctrl;
  73         const char *uname;
  74         int retval, daysleft;
  75         time_t curdays;
  76         struct spwd *spent;
  77         struct passwd *pwent;
  78         char buf[80];
  79
  80         D(("called."));
  81
  82         ctrl = _set_ctrl(pamh, flags, NULL, argc, argv);
  83
  84         retval = pam_get_item(pamh, PAM_USER, (const void **) &uname);
  85         D(("user = `%s'", uname));
  86         if (retval != PAM_SUCCESS || uname == NULL) {
  87                 _log_err(LOG_ALERT, pamh
  88                          ,"could not identify user (from uid=%d)"
  89                          ,getuid());
  90                 return PAM_USER_UNKNOWN;
  91         }
  92
  93         pwent = _pammodutil_getpwnam(pamh, uname);
  94         if (!pwent) {
  95                 _log_err(LOG_ALERT, pamh
  96                          ,"could not identify user (from getpwnam(%s))"
  97                          ,uname);
  98                 return PAM_USER_UNKNOWN;
  99         }
 100
 101         if (!strcmp( pwent->pw_passwd, "*NP*" )) { /* NIS+ */
 102                 uid_t save_euid, save_uid;
 103
 104                 save_euid = geteuid();
 105                 save_uid = getuid();
 106                 if (save_uid == pwent->pw_uid)
 107                         setreuid( save_euid, save_uid );
 108                 else  {
 109                         setreuid( 0, -1 );
 110                         if (setreuid( -1, pwent->pw_uid ) == -1) {
 111                                 setreuid( -1, 0 );
 112                                 setreuid( 0, -1 );
 113                                 if(setreuid( -1, pwent->pw_uid ) == -1)
 114                                         return PAM_CRED_INSUFFICIENT;
 115                         }
 116                 }
 117                 spent = _pammodutil_getspnam (pamh, uname);
 118                 if (save_uid == pwent->pw_uid)
 119                         setreuid( save_uid, save_euid );
 120                 else {
 121                         if (setreuid( -1, 0 ) == -1)
 122                         setreuid( save_uid, -1 );
 123                         setreuid( -1, save_euid );
 124                 }
 125
 126         } else if (_unix_shadowed (pwent))
 127                 spent = _pammodutil_getspnam (pamh, uname);
 128         else
 129                 return PAM_SUCCESS;
 130
 131         if (!spent)
 132                 if (on(UNIX_BROKEN_SHADOW,ctrl))
 133                         return PAM_SUCCESS;
 134
 135         if (!spent)
 136                 return PAM_AUTHINFO_UNAVAIL;    /* Couldn't get username from shadow */
 137
 138         curdays = time(NULL) / (60 * 60 * 24);
 139         D(("today is %d, last change %d", curdays, spent->sp_lstchg));
 140         if ((curdays > spent->sp_expire) && (spent->sp_expire != -1)
 141             && (spent->sp_lstchg != 0)) {
 142                 _log_err(LOG_NOTICE, pamh
 143                          ,"account %s has expired (account expired)"
 144                          ,uname);
 145                 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
 146                             "Your account has expired; please contact your system administrator");
 147                 D(("account expired"));
 148                 return PAM_ACCT_EXPIRED;
 149         }
 150         if ((curdays > (spent->sp_lstchg + spent->sp_max + spent->sp_inact))
 151             && (spent->sp_max != -1) && (spent->sp_inact != -1)
 152             && (spent->sp_lstchg != 0)) {
 153                 _log_err(LOG_NOTICE, pamh
 154                     ,"account %s has expired (failed to change password)"
 155                          ,uname);
 156                 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
 157                             "Your account has expired; please contact your system administrator");
 158                 D(("account expired 2"));
 159                 return PAM_ACCT_EXPIRED;
 160         }
 161         D(("when was the last change"));
 162         if (spent->sp_lstchg == 0) {
 163                 _log_err(LOG_NOTICE, pamh
 164                          ,"expired password for user %s (root enforced)"
 165                          ,uname);
 166                 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
 167                             "You are required to change your password immediately (root enforced)");
 168                 D(("need a new password"));
 169                 return PAM_NEW_AUTHTOK_REQD;
 170         }
 171         if (((spent->sp_lstchg + spent->sp_max) < curdays) && (spent->sp_max != -1)) {
 172                 _log_err(LOG_DEBUG, pamh
 173                          ,"expired password for user %s (password aged)"
 174                          ,uname);
 175                 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
 176                             "You are required to change your password immediately (password aged)");
 177                 D(("need a new password 2"));
 178                 return PAM_NEW_AUTHTOK_REQD;
 179         }
 180         if ((curdays > (spent->sp_lstchg + spent->sp_max - spent->sp_warn))
 181             && (spent->sp_max != -1) && (spent->sp_warn != -1)) {
 182                 daysleft = (spent->sp_lstchg + spent->sp_max) - curdays;
 183                 _log_err(LOG_DEBUG, pamh
 184                          ,"password for user %s will expire in %d days"
 185                          ,uname, daysleft);
 186                 snprintf(buf, 80, "Warning: your password will expire in %d day%.2s",
 187                          daysleft, daysleft == 1 ? "" : "s");
 188                 _make_remark(pamh, ctrl, PAM_TEXT_INFO, buf);
 189         }
 190
 191         D(("all done"));
 192
 193         return PAM_SUCCESS;
 194 }
 195
 196
 197 /* static module data */
 198 #ifdef PAM_STATIC
 199 struct pam_module _pam_unix_acct_modstruct = {
 200     "pam_unix_acct",
 201     NULL,
 202     NULL,
 203     pam_sm_acct_mgmt,
 204     NULL,
 205     NULL,
 206     NULL,
 207 };
 208 #endif