Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2 | * |
| 3 | * login.c |
| 4 | * |
| 5 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 6 | * |
| 7 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 8 | * All rights reserved |
| 9 | * |
| 10 | * Created: Fri Mar 24 14:51:08 1995 ylo |
| 11 | * |
| 12 | * This file performs some of the things login(1) normally does. We cannot |
| 13 | * easily use something like login -p -h host -f user, because there are |
| 14 | * several different logins around, and it is hard to determined what kind of |
| 15 | * login the current system has. Also, we want to be able to execute commands |
| 16 | * on a tty. |
| 17 | * |
| 18 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 19 | |
| 20 | #include "includes.h" |
Damien Miller | bf1c9b2 | 1999-12-09 10:16:54 +1100 | [diff] [blame] | 21 | RCSID("$Id: login.c,v 1.6 1999/12/08 23:16:55 damien Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 22 | |
Damien Miller | bf1c9b2 | 1999-12-09 10:16:54 +1100 | [diff] [blame] | 23 | #ifdef HAVE_UTMPX_H |
| 24 | # include <utmpx.h> |
| 25 | #endif |
| 26 | #ifdef HAVE_UTMP_H |
| 27 | # include <utmp.h> |
| 28 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 29 | #include "ssh.h" |
Damien Miller | ab18c41 | 1999-11-11 10:40:23 +1100 | [diff] [blame] | 30 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 31 | #ifdef HAVE_UTIL_H |
| 32 | # include <util.h> |
| 33 | #endif |
Damien Miller | ab18c41 | 1999-11-11 10:40:23 +1100 | [diff] [blame] | 34 | #ifdef HAVE_LASTLOG_H |
| 35 | # include <lastlog.h> |
| 36 | #endif |
Damien Miller | 063fdf8 | 1999-11-25 13:08:31 +1100 | [diff] [blame] | 37 | #ifdef HAVE_LOGIN_H |
| 38 | # include <login.h> |
| 39 | #endif |
Damien Miller | ab18c41 | 1999-11-11 10:40:23 +1100 | [diff] [blame] | 40 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 41 | /* |
| 42 | * Returns the time when the user last logged in. Returns 0 if the |
| 43 | * information is not available. This must be called before record_login. |
| 44 | * The host the user logged in from will be returned in buf. |
| 45 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 46 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 47 | /* |
| 48 | * Returns the time when the user last logged in (or 0 if no previous login |
| 49 | * is found). The name of the host used last time is returned in buf. |
| 50 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 51 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 52 | unsigned long |
| 53 | get_last_login_time(uid_t uid, const char *logname, |
| 54 | char *buf, unsigned int bufsize) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 55 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 56 | struct lastlog ll; |
| 57 | char *lastlog; |
| 58 | int fd; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 59 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 60 | lastlog = _PATH_LASTLOG; |
| 61 | buf[0] = '\0'; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 62 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 63 | fd = open(lastlog, O_RDONLY); |
| 64 | if (fd < 0) |
| 65 | return 0; |
| 66 | lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET); |
| 67 | if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) { |
| 68 | close(fd); |
| 69 | return 0; |
| 70 | } |
| 71 | close(fd); |
| 72 | if (bufsize > sizeof(ll.ll_host) + 1) |
| 73 | bufsize = sizeof(ll.ll_host) + 1; |
| 74 | strncpy(buf, ll.ll_host, bufsize - 1); |
| 75 | buf[bufsize - 1] = 0; |
| 76 | return ll.ll_time; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 77 | } |
| 78 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 79 | /* |
| 80 | * Records that the user has logged in. I these parts of operating systems |
| 81 | * were more standardized. |
| 82 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 83 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 84 | void |
| 85 | record_login(int pid, const char *ttyname, const char *user, uid_t uid, |
| 86 | const char *host, struct sockaddr_in * addr) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 87 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 88 | int fd; |
| 89 | struct lastlog ll; |
| 90 | char *lastlog; |
Damien Miller | bf1c9b2 | 1999-12-09 10:16:54 +1100 | [diff] [blame] | 91 | struct UTMP_STR u; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 92 | const char *utmp, *wtmp; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 93 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 94 | /* Construct an utmp/wtmp entry. */ |
| 95 | memset(&u, 0, sizeof(u)); |
| 96 | strncpy(u.ut_line, ttyname + 5, sizeof(u.ut_line)); |
Damien Miller | bf1c9b2 | 1999-12-09 10:16:54 +1100 | [diff] [blame] | 97 | #ifdef HAVE_UTMPX_H |
| 98 | u.ut_tv.tv_sec = time(NULL); |
| 99 | strncpy(u.ut_user, user, sizeof(u.ut_name)); |
| 100 | #else |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 101 | u.ut_time = time(NULL); |
| 102 | strncpy(u.ut_name, user, sizeof(u.ut_name)); |
Damien Miller | bf1c9b2 | 1999-12-09 10:16:54 +1100 | [diff] [blame] | 103 | #endif |
| 104 | #if defined(HAVE_HOST_IN_UTMP) || defined(HAVE_HOST_IN_UTMPX) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 105 | strncpy(u.ut_host, host, sizeof(u.ut_host)); |
Damien Miller | ab18c41 | 1999-11-11 10:40:23 +1100 | [diff] [blame] | 106 | #endif |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 107 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 108 | /* Figure out the file names. */ |
| 109 | utmp = _PATH_UTMP; |
| 110 | wtmp = _PATH_WTMP; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 111 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 112 | login(&u); |
| 113 | lastlog = _PATH_LASTLOG; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 114 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 115 | /* Update lastlog unless actually recording a logout. */ |
| 116 | if (strcmp(user, "") != 0) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 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 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 121 | memset(&ll, 0, sizeof(ll)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 122 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 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 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 134 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 135 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 136 | |
| 137 | /* Records that the user has logged out. */ |
| 138 | |
| 139 | void |
| 140 | record_logout(int pid, const char *ttyname) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 141 | { |
Damien Miller | ab18c41 | 1999-11-11 10:40:23 +1100 | [diff] [blame] | 142 | #ifdef HAVE_LIBUTIL_LOGIN |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 143 | const char *line = ttyname + 5; /* /dev/ttyq8 -> ttyq8 */ |
| 144 | if (logout(line)) |
| 145 | logwtmp(line, "", ""); |
Damien Miller | ab18c41 | 1999-11-11 10:40:23 +1100 | [diff] [blame] | 146 | #else /* HAVE_LIBUTIL_LOGIN */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 147 | record_login(pid, ttyname, "", -1, "", NULL); |
Damien Miller | ab18c41 | 1999-11-11 10:40:23 +1100 | [diff] [blame] | 148 | #endif /* HAVE_LIBUTIL_LOGIN */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 149 | } |