1 | /* |
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2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
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3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
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4 | * All rights reserved |
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5 | * This file performs some of the things login(1) normally does. We cannot |
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6 | * easily use something like login -p -h host -f user, because there are |
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7 | * several different logins around, and it is hard to determined what kind of |
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8 | * login the current system has. Also, we want to be able to execute commands |
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9 | * on a tty. |
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10 | * |
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11 | * As far as I am concerned, the code I have written for this software |
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12 | * can be used freely for any purpose. Any derived versions of this |
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13 | * software must be clearly marked as such, and if the derived work is |
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14 | * incompatible with the protocol description in the RFC file, it must be |
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15 | * called by a name other than "ssh" or "Secure Shell". |
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16 | * |
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17 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. |
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18 | * Copyright (c) 1999 Markus Friedl. All rights reserved. |
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19 | * |
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20 | * Redistribution and use in source and binary forms, with or without |
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21 | * modification, are permitted provided that the following conditions |
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22 | * are met: |
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23 | * 1. Redistributions of source code must retain the above copyright |
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24 | * notice, this list of conditions and the following disclaimer. |
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25 | * 2. Redistributions in binary form must reproduce the above copyright |
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26 | * notice, this list of conditions and the following disclaimer in the |
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27 | * documentation and/or other materials provided with the distribution. |
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28 | * |
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29 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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30 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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31 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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32 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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33 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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34 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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35 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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36 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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37 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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38 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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39 | */ |
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40 | |
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41 | #include "includes.h" |
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42 | RCSID("$OpenBSD: sshlogin.c,v 1.13 2004/08/12 09:18:24 djm Exp $"); |
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43 | |
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44 | #include "loginrec.h" |
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45 | #include "log.h" |
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46 | #include "buffer.h" |
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47 | #include "servconf.h" |
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48 | |
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49 | extern Buffer loginmsg; |
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50 | extern ServerOptions options; |
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51 | |
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52 | /* |
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53 | * Returns the time when the user last logged in. Returns 0 if the |
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54 | * information is not available. This must be called before record_login. |
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55 | * The host the user logged in from will be returned in buf. |
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56 | */ |
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57 | u_long |
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58 | get_last_login_time(uid_t uid, const char *logname, |
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59 | char *buf, u_int bufsize) |
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60 | { |
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61 | struct logininfo li; |
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62 | |
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63 | login_get_lastlog(&li, uid); |
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64 | strlcpy(buf, li.hostname, bufsize); |
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65 | return li.tv_sec; |
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66 | } |
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67 | |
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68 | /* |
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69 | * Generate and store last login message. This must be done before |
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70 | * login_login() is called and lastlog is updated. |
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71 | */ |
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72 | static void |
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73 | store_lastlog_message(const char *user, uid_t uid) |
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74 | { |
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75 | char *time_string, hostname[MAXHOSTNAMELEN] = "", buf[512]; |
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76 | time_t last_login_time; |
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77 | |
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78 | #ifndef NO_SSH_LASTLOG |
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79 | if (!options.print_lastlog) |
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80 | return; |
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81 | |
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82 | last_login_time = get_last_login_time(uid, user, hostname, |
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83 | sizeof(hostname)); |
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84 | |
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85 | if (last_login_time != 0) { |
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86 | time_string = ctime(&last_login_time); |
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87 | if (strchr(time_string, '\n')) |
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88 | *strchr(time_string, '\n') = '\0'; |
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89 | if (strcmp(hostname, "") == 0) |
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90 | snprintf(buf, sizeof(buf), "Last login: %s\r\n", |
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91 | time_string); |
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92 | else |
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93 | snprintf(buf, sizeof(buf), "Last login: %s from %s\r\n", |
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94 | time_string, hostname); |
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95 | buffer_append(&loginmsg, buf, strlen(buf)); |
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96 | } |
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97 | #endif /* NO_SSH_LASTLOG */ |
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98 | } |
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99 | |
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100 | /* |
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101 | * Records that the user has logged in. I wish these parts of operating |
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102 | * systems were more standardized. |
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103 | */ |
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104 | void |
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105 | record_login(pid_t pid, const char *tty, const char *user, uid_t uid, |
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106 | const char *host, struct sockaddr * addr, socklen_t addrlen) |
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107 | { |
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108 | struct logininfo *li; |
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109 | |
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110 | /* save previous login details before writing new */ |
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111 | store_lastlog_message(user, uid); |
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112 | |
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113 | li = login_alloc_entry(pid, user, host, tty); |
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114 | login_set_addr(li, addr, addrlen); |
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115 | login_login(li); |
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116 | login_free_entry(li); |
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117 | } |
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118 | |
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119 | #ifdef LOGIN_NEEDS_UTMPX |
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120 | void |
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121 | record_utmp_only(pid_t pid, const char *ttyname, const char *user, |
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122 | const char *host, struct sockaddr * addr, socklen_t addrlen) |
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123 | { |
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124 | struct logininfo *li; |
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125 | |
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126 | li = login_alloc_entry(pid, user, host, ttyname); |
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127 | login_set_addr(li, addr, addrlen); |
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128 | login_utmp_only(li); |
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129 | login_free_entry(li); |
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130 | } |
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131 | #endif |
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132 | |
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133 | /* Records that the user has logged out. */ |
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134 | void |
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135 | record_logout(pid_t pid, const char *tty, const char *user) |
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136 | { |
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137 | struct logininfo *li; |
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138 | |
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139 | li = login_alloc_entry(pid, user, NULL, tty); |
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140 | login_logout(li); |
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141 | login_free_entry(li); |
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142 | } |
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