1 /* $OpenBSD: sshlogin.c,v 1.25 2006/08/03 03:34:42 deraadt Exp $ */ 2 /* 3 * Author: Tatu Ylonen <ylo@cs.hut.fi> 4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 5 * All rights reserved 6 * This file performs some of the things login(1) normally does. We cannot 7 * easily use something like login -p -h host -f user, because there are 8 * several different logins around, and it is hard to determined what kind of 9 * login the current system has. Also, we want to be able to execute commands 10 * on a tty. 11 * 12 * As far as I am concerned, the code I have written for this software 13 * can be used freely for any purpose. Any derived versions of this 14 * software must be clearly marked as such, and if the derived work is 15 * incompatible with the protocol description in the RFC file, it must be 16 * called by a name other than "ssh" or "Secure Shell". 17 * 18 * Copyright (c) 1999 Theo de Raadt. All rights reserved. 19 * Copyright (c) 1999 Markus Friedl. All rights reserved. 20 * 21 * Redistribution and use in source and binary forms, with or without 22 * modification, are permitted provided that the following conditions 23 * are met: 24 * 1. Redistributions of source code must retain the above copyright 25 * notice, this list of conditions and the following disclaimer. 26 * 2. Redistributions in binary form must reproduce the above copyright 27 * notice, this list of conditions and the following disclaimer in the 28 * documentation and/or other materials provided with the distribution. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 31 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 33 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 34 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 35 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 39 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 40 */ 41 42 #include "includes.h" 43 44 #include <sys/types.h> 45 #include <sys/param.h> 46 #include <sys/socket.h> 47 48 #include <netinet/in.h> 49 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <stdarg.h> 53 #include <stdio.h> 54 #include <string.h> 55 #include <time.h> 56 #include <unistd.h> 57 58 #include "loginrec.h" 59 #include "log.h" 60 #include "buffer.h" 61 #include "servconf.h" 62 63 extern Buffer loginmsg; 64 extern ServerOptions options; 65 66 /* 67 * Returns the time when the user last logged in. Returns 0 if the 68 * information is not available. This must be called before record_login. 69 * The host the user logged in from will be returned in buf. 70 */ 71 time_t 72 get_last_login_time(uid_t uid, const char *logname, 73 char *buf, size_t bufsize) 74 { 75 struct logininfo li; 76 77 login_get_lastlog(&li, uid); 78 strlcpy(buf, li.hostname, bufsize); 79 return (time_t)li.tv_sec; 80 } 81 82 /* 83 * Generate and store last login message. This must be done before 84 * login_login() is called and lastlog is updated. 85 */ 86 static void 87 store_lastlog_message(const char *user, uid_t uid) 88 { 89 char *time_string, hostname[MAXHOSTNAMELEN] = "", buf[512]; 90 time_t last_login_time; 91 92 #ifndef NO_SSH_LASTLOG 93 if (!options.print_lastlog) 94 return; 95 96 last_login_time = get_last_login_time(uid, user, hostname, 97 sizeof(hostname)); 98 99 if (last_login_time != 0) { 100 time_string = ctime(&last_login_time); 101 if (strchr(time_string, '\n')) 102 *strchr(time_string, '\n') = '\0'; 103 if (strcmp(hostname, "") == 0) 104 snprintf(buf, sizeof(buf), "Last login: %s\r\n", 105 time_string); 106 else 107 snprintf(buf, sizeof(buf), "Last login: %s from %s\r\n", 108 time_string, hostname); 109 buffer_append(&loginmsg, buf, strlen(buf)); 110 } 111 #endif /* NO_SSH_LASTLOG */ 112 } 113 114 /* 115 * Records that the user has logged in. I wish these parts of operating 116 * systems were more standardized. 117 */ 118 void 119 record_login(pid_t pid, const char *tty, const char *user, uid_t uid, 120 const char *host, struct sockaddr *addr, socklen_t addrlen) 121 { 122 struct logininfo *li; 123 124 /* save previous login details before writing new */ 125 store_lastlog_message(user, uid); 126 127 li = login_alloc_entry(pid, user, host, tty); 128 login_set_addr(li, addr, addrlen); 129 login_login(li); 130 login_free_entry(li); 131 } 132 133 #ifdef LOGIN_NEEDS_UTMPX 134 void 135 record_utmp_only(pid_t pid, const char *ttyname, const char *user, 136 const char *host, struct sockaddr *addr, socklen_t addrlen) 137 { 138 struct logininfo *li; 139 140 li = login_alloc_entry(pid, user, host, ttyname); 141 login_set_addr(li, addr, addrlen); 142 login_utmp_only(li); 143 login_free_entry(li); 144 } 145 #endif 146 147 /* Records that the user has logged out. */ 148 void 149 record_logout(pid_t pid, const char *tty, const char *user) 150 { 151 struct logininfo *li; 152 153 li = login_alloc_entry(pid, user, NULL, tty); 154 login_logout(li); 155 login_free_entry(li); 156 } 157