| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: banned.c,v 1.2 1999/04/21 09:07:55 mdw Exp $ |
| 4 | * |
| 5 | * Ban a user from logging in |
| 6 | * |
| 7 | * (c) 1999 Mark Wooding |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with this program; if not, write to the Free Software Foundation, |
| 24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 25 | */ |
| 26 | |
| 27 | /*----- Revision history --------------------------------------------------* |
| 28 | * |
| 29 | * $Log: banned.c,v $ |
| 30 | * Revision 1.2 1999/04/21 09:07:55 mdw |
| 31 | * Fiddle with copyright messages so that they're correct. |
| 32 | * |
| 33 | * Revision 1.1.1.1 1999/04/20 00:19:04 mdw |
| 34 | * Initial versions. |
| 35 | * |
| 36 | */ |
| 37 | |
| 38 | /*----- Header files ------------------------------------------------------*/ |
| 39 | |
| 40 | #include <errno.h> |
| 41 | #include <stdio.h> |
| 42 | #include <stdlib.h> |
| 43 | #include <string.h> |
| 44 | #include <sys/types.h> |
| 45 | #include <pwd.h> |
| 46 | #include <unistd.h> |
| 47 | #include <fcntl.h> |
| 48 | #include <syslog.h> |
| 49 | |
| 50 | /*----- Main code ---------------------------------------------------------*/ |
| 51 | |
| 52 | static const char *quis = "banned"; |
| 53 | |
| 54 | int main(int argc, char *argv[]) |
| 55 | { |
| 56 | struct passwd *pw; |
| 57 | int fd; |
| 58 | char buf[BUFSIZ]; |
| 59 | int r; |
| 60 | |
| 61 | /* --- Resolve the program name --- */ |
| 62 | |
| 63 | { |
| 64 | char *p, *q; |
| 65 | p = argv[0]; |
| 66 | for (q = argv[0]; *q; q++) { |
| 67 | if (*q == '/') |
| 68 | p = q + 1; |
| 69 | } |
| 70 | quis = p; |
| 71 | } |
| 72 | |
| 73 | /* --- Read the user's name --- */ |
| 74 | |
| 75 | pw = getpwuid(getuid()); |
| 76 | if (!pw) { |
| 77 | fprintf(stderr, "%s: you don't exist. Go away.\n", quis); |
| 78 | exit(EXIT_FAILURE); |
| 79 | } |
| 80 | |
| 81 | /* --- Open the log file --- */ |
| 82 | |
| 83 | openlog(quis, 0, LOG_AUTH); |
| 84 | syslog(LOG_CRIT, "banned user `%s' attempted to log in", pw->pw_name); |
| 85 | |
| 86 | /* --- Change directory to the user's home --- */ |
| 87 | |
| 88 | if (chdir(pw->pw_dir) < 0) { |
| 89 | fprintf(stderr, "%s: couldn't change directory: %s\n", |
| 90 | quis, strerror(errno)); |
| 91 | exit(EXIT_FAILURE); |
| 92 | } |
| 93 | |
| 94 | /* --- Open the reason file --- */ |
| 95 | |
| 96 | if ((fd = open(".banned", O_RDONLY)) < 0) { |
| 97 | fprintf(stderr, "%s: couldn't open `.banned' file: %s\n", |
| 98 | quis, strerror(errno)); |
| 99 | exit(EXIT_FAILURE); |
| 100 | } |
| 101 | |
| 102 | /* --- Dump the reason information out --- */ |
| 103 | |
| 104 | for (;;) { |
| 105 | r = read(fd, buf, sizeof(buf)); |
| 106 | if (r == 0) |
| 107 | break; |
| 108 | else if (r < 0) { |
| 109 | fprintf(stderr, "%s: couldn't read: %s\n", quis, strerror(errno)); |
| 110 | exit(EXIT_FAILURE); |
| 111 | } |
| 112 | write(STDOUT_FILENO, buf, r); |
| 113 | } |
| 114 | |
| 115 | /* --- Done --- */ |
| 116 | |
| 117 | close(fd); |
| 118 | return (EXIT_FAILURE); |
| 119 | } |
| 120 | |
| 121 | /*----- That's all, folks -------------------------------------------------*/ |