login_passwd/login.c

   1 /*      $OpenBSD: login.c,v 1.10 2012/06/01 01:43:19 dlg Exp $  */
   2
   3 /*-
   4  * Copyright (c) 1995 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: login_passwd.c,v 1.11 1997/08/08 18:58:24 prb Exp $
  35  */
  36
  37 #include "common.h"
  38
  39 FILE *back = NULL;
  40
  41 int
  42 main(int argc, char **argv)
  43 {
  44         int opt, mode = 0, ret, lastchance = 0;
  45         char *username, *password = NULL;
  46         char response[1024];
  47         int arg_login = 0, arg_notickets = 0;
  48         char invokinguser[LOGIN_NAME_MAX];
  49         char *wheel = NULL, *class = NULL;
  50
  51         invokinguser[0] = '\0';
  52
  53         setpriority(PRIO_PROCESS, 0, 0);
  54
  55         openlog(NULL, LOG_ODELAY, LOG_AUTH);
  56
  57         while ((opt = getopt(argc, argv, "ds:v:")) != -1) {
  58                 switch (opt) {
  59                 case 'd':
  60                         back = stdout;
  61                         break;
  62                 case 's':       /* service */
  63                         if (strcmp(optarg, "login") == 0)
  64                                 mode = MODE_LOGIN;
  65                         else if (strcmp(optarg, "challenge") == 0)
  66                                 mode = MODE_CHALLENGE;
  67                         else if (strcmp(optarg, "response") == 0)
  68                                 mode = MODE_RESPONSE;
  69                         else {
  70                                 syslog(LOG_ERR, "%s: invalid service", optarg);
  71                                 exit(1);
  72                         }
  73                         break;
  74                 case 'v':
  75                         if (strncmp(optarg, "wheel=", 6) == 0)
  76                                 wheel = optarg + 6;
  77                         else if (strncmp(optarg, "lastchance=", 11) == 0)
  78                                 lastchance = (strcmp(optarg + 11, "yes") == 0);
  79                         else if (strcmp(optarg, "login=yes") == 0)
  80                                 arg_login = 1;
  81                         else if (strcmp(optarg, "notickets=yes") == 0)
  82                                 arg_notickets = 1;
  83                         else if (strncmp(optarg, "invokinguser=", 13) == 0)
  84                                 snprintf(invokinguser, sizeof(invokinguser),
  85                                     "%s", &optarg[13]);
  86                         /* Silently ignore unsupported variables */
  87                         break;
  88                 default:
  89                         syslog(LOG_ERR, "usage error1");
  90                         exit(1);
  91                 }
  92         }
  93
  94         switch (argc - optind) {
  95         case 2:
  96                 class = argv[optind + 1];
  97                 /*FALLTHROUGH*/
  98         case 1:
  99                 username = argv[optind];
 100                 break;
 101         default:
 102                 syslog(LOG_ERR, "usage error2");
 103                 exit(1);
 104         }
 105
 106         if (back == NULL && (back = fdopen(3, "r+")) == NULL) {
 107                 syslog(LOG_ERR, "reopening back channel: %m");
 108                 exit(1);
 109         }
 110
 111         /*
 112          * Read password, either as from the terminal or if the
 113          * response mode is active from the caller program.
 114          *
 115          * XXX  This is completely ungrokkable, and should be rewritten.
 116          */
 117         switch (mode) {
 118         case MODE_RESPONSE: {
 119                 int count;
 120                 mode = 0;
 121                 count = -1;
 122                 while (++count < sizeof(response) &&
 123                     read(3, &response[count], (size_t)1) == (ssize_t)1) {
 124                         if (response[count] == '\0' && ++mode == 2)
 125                                 break;
 126                         if (response[count] == '\0' && mode == 1) {
 127                                 password = response + count + 1;
 128                         }
 129                 }
 130                 if (mode < 2) {
 131                         syslog(LOG_ERR, "protocol error on back channel");
 132                         exit(1);
 133                 }
 134                 break;
 135         }
 136
 137         case MODE_LOGIN:
 138                 password = getpass("Password:");
 139                 break;
 140         case MODE_CHALLENGE:
 141                 fprintf(back, BI_AUTH "\n");
 142                 exit(0);
 143                 break;
 144         default:
 145                 syslog(LOG_ERR, "%d: unknown mode", mode);
 146                 exit(1);
 147                 break;
 148         }
 149
 150         ret = AUTH_FAILED;
 151 #ifdef KRB5
 152         ret = krb5_login(username, invokinguser, password, arg_login,
 153                          !arg_notickets, class);
 154 #endif
 155 #ifdef PASSWD
 156         if (ret != AUTH_OK)
 157                 ret = pwd_login(username, password, wheel, lastchance, class);
 158 #endif
 159
 160         if (password != NULL)
 161                 memset(password, 0, strlen(password));
 162         if (ret != AUTH_OK)
 163                 fprintf(back, BI_REJECT "\n");
 164
 165         closelog();
 166
 167         exit(0);
 168 }