1 /*
2 * ProFTPD - FTP server daemon
3 * Copyright (c) 2006-2017 The ProFTPD Project team
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
18 *
19 * As a special exemption, The ProFTPD Project team and other respective
20 * copyright holders give permission to link this program with OpenSSL, and
21 * distribute the resulting executable, without including the source code for
22 * OpenSSL in the source distribution.
23 */
24
25 /* Lastlog code */
26
27 #include "conf.h"
28
29 #ifdef PR_USE_LASTLOG
30
log_lastlog(uid_t uid,const char * user_name,const char * tty,const pr_netaddr_t * remote_addr)31 int log_lastlog(uid_t uid, const char *user_name, const char *tty,
32 const pr_netaddr_t *remote_addr) {
33 struct lastlog ll;
34 struct stat st;
35 int fd, res;
36 char path[PR_TUNABLE_PATH_MAX] = {'\0'};
37
38 memset(&ll, 0, sizeof(ll));
39 sstrncpy(ll.ll_line, tty, sizeof(ll.ll_line));
40 sstrncpy(ll.ll_host, pr_netaddr_get_ipstr(remote_addr),
41 sizeof(ll.ll_host));
42 time((time_t *) &ll.ll_time);
43
44 /* Determine whether lastlog is a file or a directory, and act
45 * appropriately.
46 */
47 if (stat(PR_LASTLOG_PATH, &st) < 0) {
48 int xerrno = errno;
49
50 pr_log_pri(PR_LOG_NOTICE, "unable to stat '%s': %s",
51 PR_LASTLOG_PATH, strerror(xerrno));
52
53 errno = xerrno;
54 return -1;
55 }
56
57 if (S_ISDIR(st.st_mode)) {
58 memset(path, '\0', sizeof(path));
59 pr_snprintf(path, sizeof(path), "%s/%s", PR_LASTLOG_PATH, user_name);
60 path[sizeof(path)-1] = '\0';
61
62 fd = open(path, O_RDWR|O_CREAT, 0600);
63 if (fd < 0) {
64 int xerrno = errno;
65
66 pr_log_pri(PR_LOG_NOTICE, "unable to open '%s': %s", path,
67 strerror(xerrno));
68
69 errno = xerrno;
70 return -1;
71 }
72
73 } else if (S_ISREG(st.st_mode)) {
74 off_t offset;
75
76 sstrncpy(path, PR_LASTLOG_PATH, sizeof(path));
77
78 fd = open(path, O_RDWR|O_CREAT, 0600);
79 if (fd < 0) {
80 int xerrno = errno;
81
82 pr_log_pri(PR_LOG_NOTICE, "unable to open '%s': %s", path,
83 strerror(xerrno));
84
85 errno = xerrno;
86 return -1;
87 }
88
89 /* Seek to the offset in the lastlog file for this UID. */
90 offset = (off_t) ((long) uid * sizeof(ll));
91
92 if (lseek(fd, offset, SEEK_SET) != offset) {
93 int xerrno = errno;
94
95 pr_log_pri(PR_LOG_NOTICE, "unable to seek to correct lastlog location "
96 "in '%s': %s", path, strerror(xerrno));
97 (void) close(fd);
98
99 errno = xerrno;
100 return -1;
101 }
102
103 } else {
104 pr_log_pri(PR_LOG_NOTICE, "%s is not a file or directory",
105 PR_LASTLOG_PATH);
106 errno = EINVAL;
107 return -1;
108 }
109
110 res = write(fd, &ll, sizeof(ll));
111 if (res != sizeof(ll)) {
112 int xerrno = errno;
113
114 pr_log_pri(PR_LOG_WARNING, "error updating lastlog: %s",
115 strerror(xerrno));
116 (void) close(fd);
117
118 errno = xerrno;
119 return -1;
120 }
121
122 (void) close(fd);
123 return 0;
124 }
125
126 #endif /* PR_USE_LASTLOG */
127