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annotate loginrec.c @ 1622:e11ed628708b

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- Add adaptive authentication failure delay - Rework monotonic_now/gettime_wrapper and use clock_gettime on more platforms
author Matt Johnston <matt@ucc.asn.au>
date Mon, 05 Nov 2018 23:36:34 +0800
parents c7675aa88880
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2000 Andre Lucas. All rights reserved.
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3 * Portions copyright (c) 1998 Todd C. Miller
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4 * Portions copyright (c) 1996 Jason Downs
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5 * Portions copyright (c) 1996 Theo de Raadt
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6 *
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7 * Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following conditions
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9 * are met:
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10 * 1. Redistributions of source code must retain the above copyright
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11 * notice, this list of conditions and the following disclaimer.
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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26 */
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27
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28 /**
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29 ** loginrec.c: platform-independent login recording and lastlog retrieval
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30 **/
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31
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82fcf3185616 Cleaning out various dead wood found with -dead_strip
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32 /* For now lastlog code has been removed as it wasn't being used by Dropbear. */
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34 /*
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35 The new login code explained
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36 ============================
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37
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38 This code attempts to provide a common interface to login recording
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39 (utmp and friends) and last login time retrieval.
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40
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41 Its primary means of achieving this is to use 'struct logininfo', a
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42 union of all the useful fields in the various different types of
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43 system login record structures one finds on UNIX variants.
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44
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45 We depend on autoconf to define which recording methods are to be
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46 used, and which fields are contained in the relevant data structures
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47 on the local system. Many C preprocessor symbols affect which code
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48 gets compiled here.
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49
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50 The code is designed to make it easy to modify a particular
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51 recording method, without affecting other methods nor requiring so
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52 many nested conditional compilation blocks as were commonplace in
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53 the old code.
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54
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55 For login recording, we try to use the local system's libraries as
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56 these are clearly most likely to work correctly. For utmp systems
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57 this usually means login() and logout() or setutent() etc., probably
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58 in libutil, along with logwtmp() etc. On these systems, we fall back
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59 to writing the files directly if we have to, though this method
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60 requires very thorough testing so we do not corrupt local auditing
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61 information. These files and their access methods are very system
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62 specific indeed.
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63
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64 For utmpx systems, the corresponding library functions are
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65 setutxent() etc. To the author's knowledge, all utmpx systems have
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66 these library functions and so no direct write is attempted. If such
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67 a system exists and needs support, direct analogues of the [uw]tmp
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68 code should suffice.
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69
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70 Retrieving the time of last login ('lastlog') is in some ways even
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71 more problemmatic than login recording. Some systems provide a
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72 simple table of all users which we seek based on uid and retrieve a
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73 relatively standard structure. Others record the same information in
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74 a directory with a separate file, and others don't record the
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75 information separately at all. For systems in the latter category,
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76 we look backwards in the wtmp or wtmpx file for the last login entry
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77 for our user. Naturally this is slower and on busy systems could
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78 incur a significant performance penalty.
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79
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80 Calling the new code
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81 --------------------
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82
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83 In OpenSSH all login recording and retrieval is performed in
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84 login.c. Here you'll find working examples. Also, in the logintest.c
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85 program there are more examples.
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86
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87 Internal handler calling method
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88 -------------------------------
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89
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90 When a call is made to login_login() or login_logout(), both
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91 routines set a struct logininfo flag defining which action (log in,
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92 or log out) is to be taken. They both then call login_write(), which
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93 calls whichever of the many structure-specific handlers autoconf
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94 selects for the local system.
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95
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96 The handlers themselves handle system data structure specifics. Both
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97 struct utmp and struct utmpx have utility functions (see
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98 construct_utmp*()) to try to make it simpler to add extra systems
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99 that introduce new features to either structure.
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100
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101 While it may seem terribly wasteful to replicate so much similar
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102 code for each method, experience has shown that maintaining code to
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103 write both struct utmp and utmpx in one function, whilst maintaining
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104 support for all systems whether they have library support or not, is
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105 a difficult and time-consuming task.
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106
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107 Lastlog support proceeds similarly. Functions login_get_lastlog()
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108 (and its OpenSSH-tuned friend login_get_lastlog_time()) call
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109 getlast_entry(), which tries one of three methods to find the last
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110 login time. It uses local system lastlog support if it can,
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111 otherwise it tries wtmp or wtmpx before giving up and returning 0,
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112 meaning "tilt".
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113
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114 Maintenance
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115 -----------
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116
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117 In many cases it's possible to tweak autoconf to select the correct
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118 methods for a particular platform, either by improving the detection
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119 code (best), or by presetting DISABLE_<method> or CONF_<method>_FILE
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120 symbols for the platform.
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121
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122 Use logintest to check which symbols are defined before modifying
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123 configure.ac and loginrec.c. (You have to build logintest yourself
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124 with 'make logintest' as it's not built by default.)
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125
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126 Otherwise, patches to the specific method(s) are very helpful!
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127
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128 */
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129
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130 /**
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131 ** TODO:
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132 ** homegrown ttyslot()
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133 ** test, test, test
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134 **
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135 ** Platform status:
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136 ** ----------------
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137 **
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138 ** Known good:
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139 ** Linux (Redhat 6.2, Debian)
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140 ** Solaris
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141 ** HP-UX 10.20 (gcc only)
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142 ** IRIX
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143 ** NeXT - M68k/HPPA/Sparc (4.2/3.3)
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144 **
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145 ** Testing required: Please send reports!
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146 ** NetBSD
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147 ** HP-UX 11
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148 ** AIX
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149 **
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150 ** Platforms with known problems:
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151 ** Some variants of Slackware Linux
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152 **
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153 **/
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154
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155
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156 #include "includes.h"
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157 #include "loginrec.h"
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158 #include "dbutil.h"
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159 #include "atomicio.h"
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160
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161 /**
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162 ** prototypes for helper functions in this file
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163 **/
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164
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165 #if HAVE_UTMP_H
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166 void set_utmp_time(struct logininfo *li, struct utmp *ut);
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167 void construct_utmp(struct logininfo *li, struct utmp *ut);
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168 #endif
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169
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170 #ifdef HAVE_UTMPX_H
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171 void set_utmpx_time(struct logininfo *li, struct utmpx *ut);
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172 void construct_utmpx(struct logininfo *li, struct utmpx *ut);
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173 #endif
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174
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175 int utmp_write_entry(struct logininfo *li);
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176 int utmpx_write_entry(struct logininfo *li);
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177 int wtmp_write_entry(struct logininfo *li);
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178 int wtmpx_write_entry(struct logininfo *li);
153
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179 int lastlog_write_entry(struct logininfo *li);
4
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180 int syslogin_write_entry(struct logininfo *li);
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181
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182 int wtmp_get_entry(struct logininfo *li);
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183 int wtmpx_get_entry(struct logininfo *li);
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184
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185 /* pick the shortest string */
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186 #define MIN_SIZEOF(s1,s2) ( sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2) )
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187
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188 /**
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189 ** platform-independent login functions
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190 **/
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191
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192 /* login_login(struct logininfo *) -Record a login
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193 *
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194 * Call with a pointer to a struct logininfo initialised with
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195 * login_init_entry() or login_alloc_entry()
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196 *
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197 * Returns:
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198 * >0 if successful
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199 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
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200 */
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201 int
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202 login_login (struct logininfo *li)
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203 {
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204 li->type = LTYPE_LOGIN;
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205 return login_write(li);
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206 }
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207
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208
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209 /* login_logout(struct logininfo *) - Record a logout
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210 *
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211 * Call as with login_login()
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212 *
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213 * Returns:
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214 * >0 if successful
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215 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
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216 */
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217 int
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218 login_logout(struct logininfo *li)
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219 {
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220 li->type = LTYPE_LOGOUT;
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221 return login_write(li);
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222 }
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223
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224
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225 /* login_alloc_entry(int, char*, char*, char*) - Allocate and initialise
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226 * a logininfo structure
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227 *
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228 * This function creates a new struct logininfo, a data structure
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229 * meant to carry the information required to portably record login info.
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230 *
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231 * Returns a pointer to a newly created struct logininfo. If memory
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232 * allocation fails, the program halts.
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233 */
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234 struct
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235 logininfo *login_alloc_entry(int pid, const char *username,
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236 const char *hostname, const char *line)
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237 {
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238 struct logininfo *newli;
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239
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240 newli = (struct logininfo *) m_malloc (sizeof(*newli));
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241 (void)login_init_entry(newli, pid, username, hostname, line);
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242 return newli;
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243 }
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244
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245
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246 /* login_free_entry(struct logininfo *) - free struct memory */
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247 void
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248 login_free_entry(struct logininfo *li)
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249 {
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250 m_free(li);
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251 }
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252
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253
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254 /* login_init_entry(struct logininfo *, int, char*, char*, char*)
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255 * - initialise a struct logininfo
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256 *
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257 * Populates a new struct logininfo, a data structure meant to carry
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258 * the information required to portably record login info.
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259 *
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260 * Returns: 1
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261 */
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262 int
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263 login_init_entry(struct logininfo *li, int pid, const char *username,
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264 const char *hostname, const char *line)
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265 {
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266 struct passwd *pw;
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267
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268 memset(li, 0, sizeof(*li));
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269
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270 li->pid = pid;
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271
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272 /* set the line information */
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273 if (line)
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274 line_fullname(li->line, line, sizeof(li->line));
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275
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276 if (username) {
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277 strlcpy(li->username, username, sizeof(li->username));
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278 pw = getpwnam(li->username);
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279 if (pw == NULL)
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280 dropbear_exit("login_init_entry: Cannot find user \"%s\"",
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281 li->username);
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282 li->uid = pw->pw_uid;
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283 }
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284
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285 if (hostname)
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286 strlcpy(li->hostname, hostname, sizeof(li->hostname));
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287
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288 return 1;
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289 }
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290
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291 /* login_set_current_time(struct logininfo *) - set the current time
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292 *
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293 * Set the current time in a logininfo structure. This function is
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294 * meant to eliminate the need to deal with system dependencies for
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295 * time handling.
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296 */
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297 void
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298 login_set_current_time(struct logininfo *li)
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299 {
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300 struct timeval tv;
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301
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302 gettimeofday(&tv, NULL);
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303
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304 li->tv_sec = tv.tv_sec;
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305 li->tv_usec = tv.tv_usec;
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306 }
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307
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308 /**
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309 ** login_write: Call low-level recording functions based on autoconf
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310 ** results
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311 **/
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312 int
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313 login_write (struct logininfo *li)
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314 {
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315 #ifndef HAVE_CYGWIN
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316 if ((int)geteuid() != 0) {
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317 return 1;
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318 }
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319 #endif
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320
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321 /* set the timestamp */
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322 login_set_current_time(li);
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323 #ifdef USE_LOGIN
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324 syslogin_write_entry(li);
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325 #endif
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326 #ifdef USE_LASTLOG
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327 if (li->type == LTYPE_LOGIN) {
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328 lastlog_write_entry(li);
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329 }
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330 #endif
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331 #ifdef USE_UTMP
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332 utmp_write_entry(li);
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333 #endif
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334 #ifdef USE_WTMP
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335 wtmp_write_entry(li);
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336 #endif
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337 #ifdef USE_UTMPX
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338 utmpx_write_entry(li);
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339 #endif
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340 #ifdef USE_WTMPX
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341 wtmpx_write_entry(li);
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342 #endif
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343 return 0;
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344 }
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345
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346 #ifdef LOGIN_NEEDS_UTMPX
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347 int
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348 login_utmp_only(struct logininfo *li)
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349 {
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350 li->type = LTYPE_LOGIN;
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351 login_set_current_time(li);
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352 # ifdef USE_UTMP
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353 utmp_write_entry(li);
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354 # endif
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355 # ifdef USE_WTMP
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356 wtmp_write_entry(li);
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357 # endif
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358 # ifdef USE_UTMPX
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359 utmpx_write_entry(li);
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360 # endif
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361 # ifdef USE_WTMPX
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362 wtmpx_write_entry(li);
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363 # endif
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364 return 0;
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365 }
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366 #endif
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367
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368
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