ed36b0a2 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: banned.c,v 1.1 1999/04/20 00:19:04 mdw Exp $ |
4 | * |
5 | * Ban a user from logging in |
6 | * |
7 | * (c) 1999 Mark Wooding |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of banned. |
13 | * |
14 | * banned is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * banned is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with banned; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: banned.c,v $ |
32 | * Revision 1.1 1999/04/20 00:19:04 mdw |
33 | * Initial revision |
34 | * |
35 | */ |
36 | |
37 | /*----- Header files ------------------------------------------------------*/ |
38 | |
39 | #include <errno.h> |
40 | #include <stdio.h> |
41 | #include <stdlib.h> |
42 | #include <string.h> |
43 | #include <sys/types.h> |
44 | #include <pwd.h> |
45 | #include <unistd.h> |
46 | #include <fcntl.h> |
47 | #include <syslog.h> |
48 | |
49 | /*----- Main code ---------------------------------------------------------*/ |
50 | |
51 | static const char *quis = "banned"; |
52 | |
53 | int main(int argc, char *argv[]) |
54 | { |
55 | struct passwd *pw; |
56 | int fd; |
57 | char buf[BUFSIZ]; |
58 | int r; |
59 | |
60 | /* --- Resolve the program name --- */ |
61 | |
62 | { |
63 | char *p, *q; |
64 | p = argv[0]; |
65 | for (q = argv[0]; *q; q++) { |
66 | if (*q == '/') |
67 | p = q + 1; |
68 | } |
69 | quis = p; |
70 | } |
71 | |
72 | /* --- Read the user's name --- */ |
73 | |
74 | pw = getpwuid(getuid()); |
75 | if (!pw) { |
76 | fprintf(stderr, "%s: you don't exist. Go away.\n", quis); |
77 | exit(EXIT_FAILURE); |
78 | } |
79 | |
80 | /* --- Open the log file --- */ |
81 | |
82 | openlog(quis, 0, LOG_AUTH); |
83 | syslog(LOG_CRIT, "banned user `%s' attempted to log in", pw->pw_name); |
84 | |
85 | /* --- Change directory to the user's home --- */ |
86 | |
87 | if (chdir(pw->pw_dir) < 0) { |
88 | fprintf(stderr, "%s: couldn't change directory: %s\n", |
89 | quis, strerror(errno)); |
90 | exit(EXIT_FAILURE); |
91 | } |
92 | |
93 | /* --- Open the reason file --- */ |
94 | |
95 | if ((fd = open(".banned", O_RDONLY)) < 0) { |
96 | fprintf(stderr, "%s: couldn't open `.banned' file: %s\n", |
97 | quis, strerror(errno)); |
98 | exit(EXIT_FAILURE); |
99 | } |
100 | |
101 | /* --- Dump the reason information out --- */ |
102 | |
103 | for (;;) { |
104 | r = read(fd, buf, sizeof(buf)); |
105 | if (r == 0) |
106 | break; |
107 | else if (r < 0) { |
108 | fprintf(stderr, "%s: couldn't read: %s\n", quis, strerror(errno)); |
109 | exit(EXIT_FAILURE); |
110 | } |
111 | write(STDOUT_FILENO, buf, r); |
112 | } |
113 | |
114 | /* --- Done --- */ |
115 | |
116 | close(fd); |
117 | return (EXIT_FAILURE); |
118 | } |
119 | |
120 | /*----- That's all, folks -------------------------------------------------*/ |