1 /* 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. 10 * 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. 39 */ 40 41 #include "includes.h" 42 RCSID("$OpenBSD: sshlogin.c,v 1.13 2004/08/12 09:18:24 djm Exp $"); 43 44 #include "loginrec.h" 45 #include "log.h" 46 #include "buffer.h" 47 #include "servconf.h" 48 49 extern Buffer loginmsg; 50 extern ServerOptions options; 51 52 /* 53 * Returns the time when the user last logged in. Returns 0 if the 54 * information is not available. This must be called before record_login. 55 * The host the user logged in from will be returned in buf. 56 */ 57 u_long 58 get_last_login_time(uid_t uid, const char *logname, 59 char *buf, u_int bufsize) 60 { 61 struct logininfo li; 62 63 login_get_lastlog(&li, uid); 64 strlcpy(buf, li.hostname, bufsize); 65 return li.tv_sec; 66 } 67 68 /* 69 * Generate and store last login message. This must be done before 70 * login_login() is called and lastlog is updated. 71 */ 72 static void 73 store_lastlog_message(const char *user, uid_t uid) 74 { 75 char *time_string, hostname[MAXHOSTNAMELEN] = "", buf[512]; 76 time_t last_login_time; 77 78 #ifndef NO_SSH_LASTLOG 79 if (!options.print_lastlog) 80 return; 81 82 last_login_time = get_last_login_time(uid, user, hostname, 83 sizeof(hostname)); 84 85 if (last_login_time != 0) { 86 time_string = ctime(&last_login_time); 87 if (strchr(time_string, '\n')) 88 *strchr(time_string, '\n') = '\0'; 89 if (strcmp(hostname, "") == 0) 90 snprintf(buf, sizeof(buf), "Last login: %s\r\n", 91 time_string); 92 else 93 snprintf(buf, sizeof(buf), "Last login: %s from %s\r\n", 94 time_string, hostname); 95 buffer_append(&loginmsg, buf, strlen(buf)); 96 } 97 #endif /* NO_SSH_LASTLOG */ 98 } 99 100 /* 101 * Records that the user has logged in. I wish these parts of operating 102 * systems were more standardized. 103 */ 104 void 105 record_login(pid_t pid, const char *tty, const char *user, uid_t uid, 106 const char *host, struct sockaddr * addr, socklen_t addrlen) 107 { 108 struct logininfo *li; 109 110 /* save previous login details before writing new */ 111 store_lastlog_message(user, uid); 112 113 li = login_alloc_entry(pid, user, host, tty); 114 login_set_addr(li, addr, addrlen); 115 login_login(li); 116 login_free_entry(li); 117 } 118 119 #ifdef LOGIN_NEEDS_UTMPX 120 void 121 record_utmp_only(pid_t pid, const char *ttyname, const char *user, 122 const char *host, struct sockaddr * addr, socklen_t addrlen) 123 { 124 struct logininfo *li; 125 126 li = login_alloc_entry(pid, user, host, ttyname); 127 login_set_addr(li, addr, addrlen); 128 login_utmp_only(li); 129 login_free_entry(li); 130 } 131 #endif 132 133 /* Records that the user has logged out. */ 134 void 135 record_logout(pid_t pid, const char *tty, const char *user) 136 { 137 struct logininfo *li; 138 139 li = login_alloc_entry(pid, user, NULL, tty); 140 login_logout(li); 141 login_free_entry(li); 142 } 143