Annotation of src/usr.bin/ssh/login.c, Revision 1.13.2.2
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"
1.13.2.2! jason 42: RCSID("$OpenBSD: login.c,v 1.15 2000/09/07 20:27:52 deraadt Exp $");
1.1 deraadt 43:
1.2 dugsong 44: #include <util.h>
1.1 deraadt 45: #include <utmp.h>
46: #include "ssh.h"
47:
1.10 markus 48: /*
49: * Returns the time when the user last logged in. Returns 0 if the
50: * information is not available. This must be called before record_login.
51: * The host the user logged in from will be returned in buf.
52: */
53:
54: /*
55: * Returns the time when the user last logged in (or 0 if no previous login
56: * is found). The name of the host used last time is returned in buf.
57: */
1.1 deraadt 58:
1.12 markus 59: unsigned long
1.8 markus 60: get_last_login_time(uid_t uid, const char *logname,
61: char *buf, unsigned int bufsize)
1.1 deraadt 62: {
1.8 markus 63: struct lastlog ll;
64: char *lastlog;
65: int fd;
66:
67: lastlog = _PATH_LASTLOG;
68: buf[0] = '\0';
69:
70: fd = open(lastlog, O_RDONLY);
71: if (fd < 0)
72: return 0;
73: lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
74: if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
75: close(fd);
76: return 0;
77: }
78: close(fd);
79: if (bufsize > sizeof(ll.ll_host) + 1)
80: bufsize = sizeof(ll.ll_host) + 1;
81: strncpy(buf, ll.ll_host, bufsize - 1);
82: buf[bufsize - 1] = 0;
83: return ll.ll_time;
1.1 deraadt 84: }
85:
1.10 markus 86: /*
87: * Records that the user has logged in. I these parts of operating systems
88: * were more standardized.
89: */
1.1 deraadt 90:
1.12 markus 91: void
1.13 deraadt 92: record_login(pid_t pid, const char *ttyname, const char *user, uid_t uid,
1.11 markus 93: const char *host, struct sockaddr * addr)
1.1 deraadt 94: {
1.8 markus 95: int fd;
96: struct lastlog ll;
97: char *lastlog;
98: struct utmp u;
99: const char *utmp, *wtmp;
100:
101: /* Construct an utmp/wtmp entry. */
102: memset(&u, 0, sizeof(u));
103: strncpy(u.ut_line, ttyname + 5, sizeof(u.ut_line));
104: u.ut_time = time(NULL);
105: strncpy(u.ut_name, user, sizeof(u.ut_name));
106: strncpy(u.ut_host, host, sizeof(u.ut_host));
107:
108: /* Figure out the file names. */
109: utmp = _PATH_UTMP;
110: wtmp = _PATH_WTMP;
111:
112: login(&u);
113: lastlog = _PATH_LASTLOG;
114:
115: /* Update lastlog unless actually recording a logout. */
116: if (strcmp(user, "") != 0) {
1.10 markus 117: /*
118: * It is safer to bzero the lastlog structure first because
119: * some systems might have some extra fields in it (e.g. SGI)
120: */
1.8 markus 121: memset(&ll, 0, sizeof(ll));
122:
123: /* Update lastlog. */
124: ll.ll_time = time(NULL);
125: strncpy(ll.ll_line, ttyname + 5, sizeof(ll.ll_line));
126: strncpy(ll.ll_host, host, sizeof(ll.ll_host));
127: fd = open(lastlog, O_RDWR);
128: if (fd >= 0) {
129: lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
130: if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
131: log("Could not write %.100s: %.100s", lastlog, strerror(errno));
132: close(fd);
133: }
1.1 deraadt 134: }
135: }
1.8 markus 136:
1.1 deraadt 137: /* Records that the user has logged out. */
138:
1.12 markus 139: void
1.13 deraadt 140: record_logout(pid_t pid, const char *ttyname)
1.1 deraadt 141: {
1.8 markus 142: const char *line = ttyname + 5; /* /dev/ttyq8 -> ttyq8 */
143: if (logout(line))
144: logwtmp(line, "", "");
1.1 deraadt 145: }
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