1 /* $OpenBSD: sshlogin.c,v 1.27 2011/01/11 06:06:09 djm Exp $ */ 2 /* 3 * Author: Tatu Ylonen <ylo (at) cs.hut.fi> 4 * Copyright (c) 1995 Tatu Ylonen <ylo (at) 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 #ifndef NO_SSH_LASTLOG 90 char *time_string, hostname[MAXHOSTNAMELEN] = "", buf[512]; 91 time_t last_login_time; 92 93 if (!options.print_lastlog) 94 return; 95 96 # ifdef CUSTOM_SYS_AUTH_GET_LASTLOGIN_MSG 97 time_string = sys_auth_get_lastlogin_msg(user, uid); 98 if (time_string != NULL) { 99 buffer_append(&loginmsg, time_string, strlen(time_string)); 100 xfree(time_string); 101 } 102 # else 103 last_login_time = get_last_login_time(uid, user, hostname, 104 sizeof(hostname)); 105 106 if (last_login_time != 0) { 107 time_string = ctime(&last_login_time); 108 time_string[strcspn(time_string, "\n")] = '\0'; 109 if (strcmp(hostname, "") == 0) 110 snprintf(buf, sizeof(buf), "Last login: %s\r\n", 111 time_string); 112 else 113 snprintf(buf, sizeof(buf), "Last login: %s from %s\r\n", 114 time_string, hostname); 115 buffer_append(&loginmsg, buf, strlen(buf)); 116 } 117 # endif /* CUSTOM_SYS_AUTH_GET_LASTLOGIN_MSG */ 118 #endif /* NO_SSH_LASTLOG */ 119 } 120 121 /* 122 * Records that the user has logged in. I wish these parts of operating 123 * systems were more standardized. 124 */ 125 void 126 record_login(pid_t pid, const char *tty, const char *user, uid_t uid, 127 const char *host, struct sockaddr *addr, socklen_t addrlen) 128 { 129 struct logininfo *li; 130 131 /* save previous login details before writing new */ 132 store_lastlog_message(user, uid); 133 134 li = login_alloc_entry(pid, user, host, tty); 135 login_set_addr(li, addr, addrlen); 136 login_login(li); 137 login_free_entry(li); 138 } 139 140 #ifdef LOGIN_NEEDS_UTMPX 141 void 142 record_utmp_only(pid_t pid, const char *ttyname, const char *user, 143 const char *host, struct sockaddr *addr, socklen_t addrlen) 144 { 145 struct logininfo *li; 146 147 li = login_alloc_entry(pid, user, host, ttyname); 148 login_set_addr(li, addr, addrlen); 149 login_utmp_only(li); 150 login_free_entry(li); 151 } 152 #endif 153 154 /* Records that the user has logged out. */ 155 void 156 record_logout(pid_t pid, const char *tty, const char *user) 157 { 158 struct logininfo *li; 159 160 li = login_alloc_entry(pid, user, NULL, tty); 161 login_logout(li); 162 login_free_entry(li); 163 } 164
