Annotation of src/usr.bin/ssh/login.c, Revision 1.13.2.3
1.1 deraadt 1: /*
1.9 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
5: * This file performs some of the things login(1) normally does. We cannot
6: * easily use something like login -p -h host -f user, because there are
7: * several different logins around, and it is hard to determined what kind of
8: * login the current system has. Also, we want to be able to execute commands
9: * on a tty.
1.12 markus 10: *
1.13.2.2 jason 11: * As far as I am concerned, the code I have written for this software
12: * can be used freely for any purpose. Any derived versions of this
13: * software must be clearly marked as such, and if the derived work is
14: * incompatible with the protocol description in the RFC file, it must be
15: * called by a name other than "ssh" or "Secure Shell".
16: *
17: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
18: * Copyright (c) 1999 Markus Friedl. All rights reserved.
19: *
20: * Redistribution and use in source and binary forms, with or without
21: * modification, are permitted provided that the following conditions
22: * are met:
23: * 1. Redistributions of source code must retain the above copyright
24: * notice, this list of conditions and the following disclaimer.
25: * 2. Redistributions in binary form must reproduce the above copyright
26: * notice, this list of conditions and the following disclaimer in the
27: * documentation and/or other materials provided with the distribution.
28: *
29: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
30: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
31: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
32: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
33: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
34: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
38: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.9 deraadt 39: */
1.1 deraadt 40:
41: #include "includes.h"
1.13.2.3! jason 42: RCSID("$OpenBSD: login.c,v 1.17 2001/01/21 19:05:51 markus Exp $");
1.1 deraadt 43:
1.2 dugsong 44: #include <util.h>
1.1 deraadt 45: #include <utmp.h>
1.13.2.3! jason 46: #include "login.h"
! 47: #include "log.h"
1.1 deraadt 48:
1.10 markus 49: /*
50: * Returns the time when the user last logged in. Returns 0 if the
51: * information is not available. This must be called before record_login.
52: * The host the user logged in from will be returned in buf.
53: */
54:
55: /*
56: * Returns the time when the user last logged in (or 0 if no previous login
57: * is found). The name of the host used last time is returned in buf.
58: */
1.1 deraadt 59:
1.13.2.3! jason 60: u_long
1.8 markus 61: get_last_login_time(uid_t uid, const char *logname,
1.13.2.3! jason 62: char *buf, u_int bufsize)
1.1 deraadt 63: {
1.8 markus 64: struct lastlog ll;
65: char *lastlog;
66: int fd;
67:
68: lastlog = _PATH_LASTLOG;
69: buf[0] = '\0';
70:
71: fd = open(lastlog, O_RDONLY);
72: if (fd < 0)
73: return 0;
74: lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
75: if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
76: close(fd);
77: return 0;
78: }
79: close(fd);
80: if (bufsize > sizeof(ll.ll_host) + 1)
81: bufsize = sizeof(ll.ll_host) + 1;
82: strncpy(buf, ll.ll_host, bufsize - 1);
83: buf[bufsize - 1] = 0;
84: return ll.ll_time;
1.1 deraadt 85: }
86:
1.10 markus 87: /*
88: * Records that the user has logged in. I these parts of operating systems
89: * were more standardized.
90: */
1.1 deraadt 91:
1.12 markus 92: void
1.13 deraadt 93: record_login(pid_t pid, const char *ttyname, const char *user, uid_t uid,
1.11 markus 94: const char *host, struct sockaddr * addr)
1.1 deraadt 95: {
1.8 markus 96: int fd;
97: struct lastlog ll;
98: char *lastlog;
99: struct utmp u;
100: const char *utmp, *wtmp;
101:
102: /* Construct an utmp/wtmp entry. */
103: memset(&u, 0, sizeof(u));
104: strncpy(u.ut_line, ttyname + 5, sizeof(u.ut_line));
105: u.ut_time = time(NULL);
106: strncpy(u.ut_name, user, sizeof(u.ut_name));
107: strncpy(u.ut_host, host, sizeof(u.ut_host));
108:
109: /* Figure out the file names. */
110: utmp = _PATH_UTMP;
111: wtmp = _PATH_WTMP;
112:
113: login(&u);
114: lastlog = _PATH_LASTLOG;
115:
116: /* Update lastlog unless actually recording a logout. */
117: if (strcmp(user, "") != 0) {
1.10 markus 118: /*
119: * It is safer to bzero the lastlog structure first because
120: * some systems might have some extra fields in it (e.g. SGI)
121: */
1.8 markus 122: memset(&ll, 0, sizeof(ll));
123:
124: /* Update lastlog. */
125: ll.ll_time = time(NULL);
126: strncpy(ll.ll_line, ttyname + 5, sizeof(ll.ll_line));
127: strncpy(ll.ll_host, host, sizeof(ll.ll_host));
128: fd = open(lastlog, O_RDWR);
129: if (fd >= 0) {
130: lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
131: if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
132: log("Could not write %.100s: %.100s", lastlog, strerror(errno));
133: close(fd);
134: }
1.1 deraadt 135: }
136: }
1.8 markus 137:
1.1 deraadt 138: /* Records that the user has logged out. */
139:
1.12 markus 140: void
1.13 deraadt 141: record_logout(pid_t pid, const char *ttyname)
1.1 deraadt 142: {
1.8 markus 143: const char *line = ttyname + 5; /* /dev/ttyq8 -> ttyq8 */
144: if (logout(line))
145: logwtmp(line, "", "");
1.1 deraadt 146: }
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