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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: banned.c,v 1.2 1999/04/21 09:07:55 mdw Exp $ |
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4 | * |
5 | * Ban a user from logging in |
6 | * |
7 | * (c) 1999 Mark Wooding |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
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12 | * This program is free software; you can redistribute it and/or modify |
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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 | * |
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17 | * This program is distributed in the hope that it will be useful, |
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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 |
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23 | * along with this program; if not, write to the Free Software Foundation, |
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24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
25 | */ |
26 | |
27 | /*----- Revision history --------------------------------------------------* |
28 | * |
29 | * $Log: banned.c,v $ |
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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. |
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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 -------------------------------------------------*/ |