Annotation of src/usr.bin/login/failedlogin.c, Revision 1.3
1.3 ! art 1: /* $OpenBSD: failedlogin.c,v 1.2 1996/12/04 04:04:41 millert Exp $ */
1.1 millert 2:
3: /*
4: * Copyright (c) 1996 Todd C. Miller <Todd.Miller@courtesan.com>
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by Todd C. Miller.
18: * 4. The name of the author may not be used to endorse or promote products
19: * derived from this software without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
22: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
23: * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
24: * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
27: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
28: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
29: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
30: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31: */
32:
33: #ifndef lint
1.3 ! art 34: static char rcsid[] = "$OpenBSD: failedlogin.c,v 1.2 1996/12/04 04:04:41 millert Exp $";
1.1 millert 35: #endif /* not lint */
36:
37: /*
38: * failedlogin.c
39: * Log to failedlogin file and read from it, reporting the number of
40: * failed logins since the last good login and when/from where
41: * the last failed login was.
42: */
43:
44: #include <sys/file.h>
45: #include <sys/param.h>
46: #include <sys/stat.h>
47: #include <sys/time.h>
48:
49: #include <stdio.h>
50: #include <string.h>
51: #include <unistd.h>
52: #include <utmp.h>
53:
54: #include "pathnames.h"
55:
56: struct badlogin {
57: char bl_line[UT_LINESIZE]; /* tty used */
1.2 millert 58: char bl_name[UT_NAMESIZE]; /* remote username */
1.1 millert 59: char bl_host[UT_HOSTSIZE]; /* remote host */
1.2 millert 60: time_t bl_time; /* time of the login attempt */
61: size_t count; /* number of bad logins */
1.1 millert 62: };
63:
64: /*
65: * Log a bad login to the failedlogin file.
66: */
67: void
1.2 millert 68: log_failedlogin(uid, host, name, tty)
1.1 millert 69: uid_t uid;
1.2 millert 70: char *host, *name, *tty;
1.1 millert 71: {
72: struct badlogin failedlogin;
73: int fd;
74:
75: /* Add O_CREAT if you want to create failedlogin if it doesn't exist */
76: if ((fd = open(_PATH_FAILEDLOGIN, O_RDWR, S_IREAD|S_IWRITE)) >= 0) {
77: (void)lseek(fd, (off_t)uid * sizeof(failedlogin), L_SET);
78:
79: /* Read in last bad login so can get the count */
80: if (read(fd, (char *)&failedlogin, sizeof(failedlogin)) !=
81: sizeof(failedlogin) || failedlogin.bl_time == 0)
82: memset((void *)&failedlogin, 0, sizeof(failedlogin));
83:
84: (void)lseek(fd, (off_t)uid * sizeof(failedlogin), L_SET);
85: /* Increment count of bad logins */
86: ++failedlogin.count;
87: (void)time(&failedlogin.bl_time);
88: strncpy(failedlogin.bl_line, tty, sizeof(failedlogin.bl_line));
89: if (host)
90: strncpy(failedlogin.bl_host, host, sizeof(failedlogin.bl_host));
91: else
92: *failedlogin.bl_host = '\0'; /* NULL host field */
1.2 millert 93: if (name)
94: strncpy(failedlogin.bl_name, name, sizeof(failedlogin.bl_name));
95: else
96: *failedlogin.bl_name = '\0'; /* NULL name field */
1.1 millert 97: (void)write(fd, (char *)&failedlogin, sizeof(failedlogin));
98: (void)close(fd);
99: }
100: }
101:
102: /*
103: * Check the failedlogin file and report about the number of unsuccessful
104: * logins and info about the last one in lastlogin style.
105: * NOTE: zeros the count field since this is assumed to be called after the
106: * user has been validated.
107: */
108: int
109: check_failedlogin(uid)
110: uid_t uid;
111: {
112: int fd;
113: struct badlogin failedlogin;
114: int was_bad = 0;
115:
116: (void)memset((void *)&failedlogin, 0, sizeof(failedlogin));
117:
118: if ((fd = open(_PATH_FAILEDLOGIN, O_RDWR, 0)) >= 0) {
119: (void)lseek(fd, (off_t)uid * sizeof(failedlogin), L_SET);
120: if (read(fd, (char *)&failedlogin, sizeof(failedlogin)) ==
121: sizeof(failedlogin) && failedlogin.count > 0 ) {
122: /* There was a bad login */
123: was_bad = 1;
124: if (failedlogin.count > 1)
125: (void)printf("There have been %u unsuccessful login attempts to your account.\n",
126: failedlogin.count);
127: (void)printf("Last unsucessful login: %.*s", 24-5,
128: (char *)ctime(&failedlogin.bl_time));
129: (void)printf(" on %.*s",
130: (int)sizeof(failedlogin.bl_line),
131: failedlogin.bl_line);
1.3 ! art 132: if (*failedlogin.bl_host != '\0') {
1.2 millert 133: if (*failedlogin.bl_name != '\0')
134: (void)printf(" from %.*s@%.*s",
135: (int)sizeof(failedlogin.bl_name),
136: failedlogin.bl_name,
137: (int)sizeof(failedlogin.bl_host),
138: failedlogin.bl_host);
139: else
140: (void)printf(" from %.*s",
141: (int)sizeof(failedlogin.bl_host),
142: failedlogin.bl_host);
1.3 ! art 143: }
1.1 millert 144: (void)putchar('\n');
145:
146: /* Reset since this is a good login and write record */
147: failedlogin.count = 0;
148: (void)lseek(fd, (off_t)uid * sizeof(failedlogin), L_SET);
149: (void)write(fd, (char *)&failedlogin, sizeof(failedlogin));
150: }
151: (void)close(fd);
152: }
153: return(was_bad);
154: }
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