Mercurial > dropbear
annotate dbutil.c @ 1773:c3ca130d193a
fuzzing - avoid sha1 for random seed every iteration
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 01 Nov 2020 14:01:37 +0800 |
parents | a339b1c4b9f2 |
children | 870f6e386a0b |
rev | line source |
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1 /* |
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2 * Dropbear - a SSH2 server |
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3 * |
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4 * Copyright (c) 2002,2003 Matt Johnston |
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5 * All rights reserved. |
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6 * |
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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8 * of this software and associated documentation files (the "Software"), to deal |
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9 * in the Software without restriction, including without limitation the rights |
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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11 * copies of the Software, and to permit persons to whom the Software is |
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12 * furnished to do so, subject to the following conditions: |
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13 * |
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14 * The above copyright notice and this permission notice shall be included in |
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15 * all copies or substantial portions of the Software. |
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16 * |
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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23 * SOFTWARE. |
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24 * |
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25 * strlcat() is copyright as follows: |
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26 * Copyright (c) 1998 Todd C. Miller <[email protected]> |
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27 * All rights reserved. |
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28 * |
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29 * Redistribution and use in source and binary forms, with or without |
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30 * modification, are permitted provided that the following conditions |
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31 * are met: |
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32 * 1. Redistributions of source code must retain the above copyright |
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33 * notice, this list of conditions and the following disclaimer. |
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34 * 2. Redistributions in binary form must reproduce the above copyright |
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35 * notice, this list of conditions and the following disclaimer in the |
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36 * documentation and/or other materials provided with the distribution. |
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37 * 3. The name of the author may not be used to endorse or promote products |
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38 * derived from this software without specific prior written permission. |
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39 * |
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40 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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41 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
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42 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL |
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43 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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44 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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45 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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46 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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47 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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48 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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49 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ |
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50 |
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51 #include "config.h" |
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52 |
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53 #ifdef __linux__ |
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54 #define _GNU_SOURCE |
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55 /* To call clock_gettime() directly */ |
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56 #include <sys/syscall.h> |
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57 #endif /* __linux */ |
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58 |
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59 #ifdef HAVE_MACH_MACH_TIME_H |
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60 #include <mach/mach_time.h> |
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61 #include <mach/mach.h> |
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62 #endif |
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63 |
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64 #include "includes.h" |
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65 #include "dbutil.h" |
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66 #include "buffer.h" |
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67 #include "session.h" |
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68 #include "atomicio.h" |
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69 |
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70 #define MAX_FMT 100 |
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71 |
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72 static void generic_dropbear_exit(int exitcode, const char* format, |
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73 va_list param) ATTRIB_NORETURN; |
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74 static void generic_dropbear_log(int priority, const char* format, |
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75 va_list param); |
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76 |
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77 void (*_dropbear_exit)(int exitcode, const char* format, va_list param) ATTRIB_NORETURN |
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78 = generic_dropbear_exit; |
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79 void (*_dropbear_log)(int priority, const char* format, va_list param) |
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80 = generic_dropbear_log; |
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81 |
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82 #if DEBUG_TRACE |
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83 int debug_trace = 0; |
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84 #endif |
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85 |
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86 #ifndef DISABLE_SYSLOG |
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87 void startsyslog(const char *ident) { |
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88 |
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89 openlog(ident, LOG_PID, LOG_AUTHPRIV); |
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90 |
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91 } |
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92 #endif /* DISABLE_SYSLOG */ |
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93 |
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94 /* the "format" string must be <= 100 characters */ |
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95 void dropbear_close(const char* format, ...) { |
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96 |
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97 va_list param; |
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98 |
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99 va_start(param, format); |
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100 _dropbear_exit(EXIT_SUCCESS, format, param); |
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101 va_end(param); |
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102 |
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103 } |
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104 |
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105 void dropbear_exit(const char* format, ...) { |
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106 |
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107 va_list param; |
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108 |
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109 va_start(param, format); |
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110 _dropbear_exit(EXIT_FAILURE, format, param); |
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111 va_end(param); |
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112 } |
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113 |
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114 static void generic_dropbear_exit(int exitcode, const char* format, |
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115 va_list param) { |
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116 |
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117 char fmtbuf[300]; |
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118 |
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119 snprintf(fmtbuf, sizeof(fmtbuf), "Exited: %s", format); |
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120 |
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121 _dropbear_log(LOG_INFO, fmtbuf, param); |
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122 |
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123 #if DROPBEAR_FUZZ |
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124 if (fuzz.do_jmp) { |
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126 } | |
127 #endif | |
128 | |
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129 exit(exitcode); |
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130 } |
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131 |
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132 void fail_assert(const char* expr, const char* file, int line) { |
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133 dropbear_exit("Failed assertion (%s:%d): `%s'", file, line, expr); |
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134 } |
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135 |
108
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136 static void generic_dropbear_log(int UNUSED(priority), const char* format, |
73
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137 va_list param) { |
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138 |
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139 char printbuf[1024]; |
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140 |
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141 vsnprintf(printbuf, sizeof(printbuf), format, param); |
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142 |
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143 fprintf(stderr, "%s\n", printbuf); |
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144 |
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145 } |
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146 |
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147 /* this is what can be called to write arbitrary log messages */ |
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148 void dropbear_log(int priority, const char* format, ...) { |
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149 |
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150 va_list param; |
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151 |
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152 va_start(param, format); |
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153 _dropbear_log(priority, format, param); |
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154 va_end(param); |
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155 } |
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156 |
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157 |
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158 #if DEBUG_TRACE |
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159 |
1021
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160 static double debug_start_time = -1; |
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161 |
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162 void debug_start_net() |
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163 { |
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164 if (getenv("DROPBEAR_DEBUG_NET_TIMESTAMP")) |
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165 { |
1250 | 166 /* Timestamps start from first network activity */ |
167 struct timeval tv; | |
168 gettimeofday(&tv, NULL); | |
169 debug_start_time = tv.tv_sec + (tv.tv_usec / 1000000.0); | |
170 TRACE(("Resetting Dropbear TRACE timestamps")) | |
1021
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171 } |
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172 } |
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173 |
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174 static double time_since_start() |
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175 { |
1250 | 176 double nowf; |
177 struct timeval tv; | |
178 gettimeofday(&tv, NULL); | |
179 nowf = tv.tv_sec + (tv.tv_usec / 1000000.0); | |
180 if (debug_start_time < 0) | |
181 { | |
182 debug_start_time = nowf; | |
183 return 0; | |
184 } | |
185 return nowf - debug_start_time; | |
1016
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186 } |
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187 |
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188 void dropbear_trace(const char* format, ...) { |
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189 va_list param; |
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190 |
1319 | 191 if (!debug_trace) { |
94
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192 return; |
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193 } |
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194 |
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195 va_start(param, format); |
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196 fprintf(stderr, "TRACE (%d) %f: ", getpid(), time_since_start()); |
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197 vfprintf(stderr, format, param); |
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198 fprintf(stderr, "\n"); |
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199 va_end(param); |
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200 } |
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201 |
731
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202 void dropbear_trace2(const char* format, ...) { |
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203 static int trace_env = -1; |
731
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204 va_list param; |
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205 |
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206 if (trace_env == -1) { |
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207 trace_env = getenv("DROPBEAR_TRACE2") ? 1 : 0; |
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208 } |
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209 |
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210 if (!(debug_trace && trace_env)) { |
731
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211 return; |
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|
212 } |
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|
213 |
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|
214 va_start(param, format); |
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215 fprintf(stderr, "TRACE2 (%d) %f: ", getpid(), time_since_start()); |
731
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216 vfprintf(stderr, format, param); |
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217 fprintf(stderr, "\n"); |
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218 va_end(param); |
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219 } |
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220 #endif /* DEBUG_TRACE */ |
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221 |
547
cf376c696dfc
Make it compile, update for changes in channel structure.
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500
diff
changeset
|
222 /* Connect to a given unix socket. The socket is blocking */ |
1499
2d450c1056e3
options: Complete the transition to numeric toggles (`#if')
Michael Witten <mfwitten@gmail.com>
parents:
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223 #if ENABLE_CONNECT_UNIX |
550
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diff
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|
224 int connect_unix(const char* path) { |
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diff
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|
225 struct sockaddr_un addr; |
225
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226 int fd = -1; |
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227 |
550
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diff
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228 memset((void*)&addr, 0x0, sizeof(addr)); |
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diff
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|
229 addr.sun_family = AF_UNIX; |
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|
230 strlcpy(addr.sun_path, path, sizeof(addr.sun_path)); |
225
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diff
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231 fd = socket(PF_UNIX, SOCK_STREAM, 0); |
550
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|
232 if (fd < 0) { |
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233 TRACE(("Failed to open unix socket")) |
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234 return -1; |
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|
235 } |
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|
236 if (connect(fd, (struct sockaddr*)&addr, sizeof(addr)) < 0) { |
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|
237 TRACE(("Failed to connect to '%s' socket", path)) |
615
e3ac0a426bd0
Fix FD leak if connect() fails, found by Klocwork
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614
diff
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|
238 m_close(fd); |
550
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239 return -1; |
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240 } |
225
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|
241 return fd; |
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|
242 } |
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|
243 #endif |
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244 |
481
357a2e2e9bcc
- Generalise spawn_command function
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245 /* Sets up a pipe for a, returning three non-blocking file descriptors |
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|
246 * and the pid. exec_fn is the function that will actually execute the child process, |
484
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247 * it will be run after the child has fork()ed, and is passed exec_data. |
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248 * If ret_errfd == NULL then stderr will not be captured. |
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249 * ret_pid can be passed as NULL to discard the pid. */ |
1460
58a74cb829b8
Pointer parameter could be declared as pointing to const (callback)
Francois Perrad <francois.perrad@gadz.org>
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1343
diff
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|
250 int spawn_command(void(*exec_fn)(const void *user_data), const void *exec_data, |
482
7ad49f34a122
- Add run_shell_command() function to run a "sh -c" command, handling
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diff
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251 int *ret_writefd, int *ret_readfd, int *ret_errfd, pid_t *ret_pid) { |
481
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- Generalise spawn_command function
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diff
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252 int infds[2]; |
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- Generalise spawn_command function
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253 int outfds[2]; |
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- Generalise spawn_command function
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254 int errfds[2]; |
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- Generalise spawn_command function
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255 pid_t pid; |
357a2e2e9bcc
- Generalise spawn_command function
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256 |
357a2e2e9bcc
- Generalise spawn_command function
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|
257 const int FDIN = 0; |
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- Generalise spawn_command function
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|
258 const int FDOUT = 1; |
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- Generalise spawn_command function
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259 |
1740
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Make wrapfd share a common buffer for all FDs
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diff
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|
260 #if DROPBEAR_FUZZ |
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Make wrapfd share a common buffer for all FDs
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diff
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|
261 if (fuzz.fuzzing) { |
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Make wrapfd share a common buffer for all FDs
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262 return fuzz_spawn_command(ret_writefd, ret_readfd, ret_errfd, ret_pid); |
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Make wrapfd share a common buffer for all FDs
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263 } |
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Make wrapfd share a common buffer for all FDs
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264 #endif |
dfbe947bdf0d
Make wrapfd share a common buffer for all FDs
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265 |
481
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- Generalise spawn_command function
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266 /* redirect stdin/stdout/stderr */ |
484
effb4a25b1ae
Don't capture stderr from spawned processes in proxycommand mode
Matt Johnston <matt@ucc.asn.au>
parents:
482
diff
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267 if (pipe(infds) != 0) { |
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268 return DROPBEAR_FAILURE; |
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269 } |
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270 if (pipe(outfds) != 0) { |
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271 return DROPBEAR_FAILURE; |
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272 } |
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273 if (ret_errfd && pipe(errfds) != 0) { |
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274 return DROPBEAR_FAILURE; |
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275 } |
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276 |
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277 #if DROPBEAR_VFORK |
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278 pid = vfork(); |
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279 #else |
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280 pid = fork(); |
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281 #endif |
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282 |
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283 if (pid < 0) { |
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284 return DROPBEAR_FAILURE; |
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285 } |
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286 |
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287 if (!pid) { |
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288 /* child */ |
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289 |
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290 TRACE(("back to normal sigchld")) |
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291 /* Revert to normal sigchld handling */ |
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292 if (signal(SIGCHLD, SIG_DFL) == SIG_ERR) { |
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293 dropbear_exit("signal() error"); |
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294 } |
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295 |
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296 /* redirect stdin/stdout */ |
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297 |
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298 if ((dup2(infds[FDIN], STDIN_FILENO) < 0) || |
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299 (dup2(outfds[FDOUT], STDOUT_FILENO) < 0) || |
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300 (ret_errfd && dup2(errfds[FDOUT], STDERR_FILENO) < 0)) { |
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301 TRACE(("leave noptycommand: error redirecting FDs")) |
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302 dropbear_exit("Child dup2() failure"); |
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303 } |
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304 |
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305 close(infds[FDOUT]); |
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306 close(infds[FDIN]); |
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307 close(outfds[FDIN]); |
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308 close(outfds[FDOUT]); |
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309 if (ret_errfd) |
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310 { |
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311 close(errfds[FDIN]); |
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312 close(errfds[FDOUT]); |
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313 } |
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314 |
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315 exec_fn(exec_data); |
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316 /* not reached */ |
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317 return DROPBEAR_FAILURE; |
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318 } else { |
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319 /* parent */ |
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320 close(infds[FDIN]); |
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321 close(outfds[FDOUT]); |
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322 |
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323 setnonblocking(outfds[FDIN]); |
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324 setnonblocking(infds[FDOUT]); |
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325 |
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326 if (ret_errfd) { |
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327 close(errfds[FDOUT]); |
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328 setnonblocking(errfds[FDIN]); |
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329 } |
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330 |
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331 if (ret_pid) { |
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332 *ret_pid = pid; |
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333 } |
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334 |
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335 *ret_writefd = infds[FDOUT]; |
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336 *ret_readfd = outfds[FDIN]; |
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337 if (ret_errfd) { |
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338 *ret_errfd = errfds[FDIN]; |
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339 } |
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340 return DROPBEAR_SUCCESS; |
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341 } |
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342 } |
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343 |
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344 /* Runs a command with "sh -c". Will close FDs (except stdin/stdout/stderr) and |
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345 * re-enabled SIGPIPE. If cmd is NULL, will run a login shell. |
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346 */ |
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347 void run_shell_command(const char* cmd, unsigned int maxfd, char* usershell) { |
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348 char * argv[4]; |
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349 char * baseshell = NULL; |
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350 unsigned int i; |
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351 |
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352 baseshell = basename(usershell); |
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353 |
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354 if (cmd != NULL) { |
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355 argv[0] = baseshell; |
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356 } else { |
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357 /* a login shell should be "-bash" for "/bin/bash" etc */ |
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358 int len = strlen(baseshell) + 2; /* 2 for "-" */ |
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359 argv[0] = (char*)m_malloc(len); |
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360 snprintf(argv[0], len, "-%s", baseshell); |
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361 } |
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362 |
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363 if (cmd != NULL) { |
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364 argv[1] = "-c"; |
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365 argv[2] = (char*)cmd; |
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366 argv[3] = NULL; |
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367 } else { |
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368 /* construct a shell of the form "-bash" etc */ |
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369 argv[1] = NULL; |
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370 } |
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371 |
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372 /* Re-enable SIGPIPE for the executed process */ |
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373 if (signal(SIGPIPE, SIG_DFL) == SIG_ERR) { |
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374 dropbear_exit("signal() error"); |
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375 } |
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376 |
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377 /* close file descriptors except stdin/stdout/stderr |
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378 * Need to be sure FDs are closed here to avoid reading files as root */ |
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379 for (i = 3; i <= maxfd; i++) { |
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380 m_close(i); |
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381 } |
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382 |
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383 execv(usershell, argv); |
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384 } |
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385 |
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386 #if DEBUG_TRACE |
198
65585699d980
* add a "label" argument to printhex()
Matt Johnston <matt@ucc.asn.au>
parents:
173
diff
changeset
|
387 void printhex(const char * label, const unsigned char * buf, int len) { |
1764
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
388 int i, j; |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
389 |
198
65585699d980
* add a "label" argument to printhex()
Matt Johnston <matt@ucc.asn.au>
parents:
173
diff
changeset
|
390 fprintf(stderr, "%s\n", label); |
1764
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
391 /* for each 16 byte line */ |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
392 for (j = 0; j < len; j += 16) { |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
393 const int linelen = MIN(16, len - j); |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
394 |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
395 /* print hex digits */ |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
396 for (i = 0; i < 16; i++) { |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
397 if (i < linelen) { |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
398 fprintf(stderr, "%02x", buf[j+i]); |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
399 } else { |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
400 fprintf(stderr, " "); |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
401 } |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
402 // separator between pairs |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
403 if (i % 2 ==1) { |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
404 fprintf(stderr, " "); |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
405 } |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
406 } |
1764
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
407 |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
408 /* print characters */ |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
409 fprintf(stderr, " "); |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
410 for (i = 0; i < linelen; i++) { |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
411 char c = buf[j+i]; |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
412 if (!isprint(c)) { |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
413 c = '.'; |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
414 } |
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
415 fputc(c, stderr); |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
416 } |
1764
a339b1c4b9f2
Print ascii in printhex too
Matt Johnston <matt@ucc.asn.au>
parents:
1740
diff
changeset
|
417 fprintf(stderr, "\n"); |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
418 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
419 } |
764
2202e854d187
add printmpint() for debugging
Matt Johnston <matt@ucc.asn.au>
parents:
667
diff
changeset
|
420 |
2202e854d187
add printmpint() for debugging
Matt Johnston <matt@ucc.asn.au>
parents:
667
diff
changeset
|
421 void printmpint(const char *label, mp_int *mp) { |
2202e854d187
add printmpint() for debugging
Matt Johnston <matt@ucc.asn.au>
parents:
667
diff
changeset
|
422 buffer *buf = buf_new(1000); |
2202e854d187
add printmpint() for debugging
Matt Johnston <matt@ucc.asn.au>
parents:
667
diff
changeset
|
423 buf_putmpint(buf, mp); |
1432 | 424 fprintf(stderr, "%d bits ", mp_count_bits(mp)); |
764
2202e854d187
add printmpint() for debugging
Matt Johnston <matt@ucc.asn.au>
parents:
667
diff
changeset
|
425 printhex(label, buf->data, buf->len); |
2202e854d187
add printmpint() for debugging
Matt Johnston <matt@ucc.asn.au>
parents:
667
diff
changeset
|
426 buf_free(buf); |
2202e854d187
add printmpint() for debugging
Matt Johnston <matt@ucc.asn.au>
parents:
667
diff
changeset
|
427 |
2202e854d187
add printmpint() for debugging
Matt Johnston <matt@ucc.asn.au>
parents:
667
diff
changeset
|
428 } |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
429 #endif |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
430 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
431 /* Strip all control characters from text (a null-terminated string), except |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
432 * for '\n', '\r' and '\t'. |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
433 * The result returned is a newly allocated string, this must be free()d after |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
434 * use */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
435 char * stripcontrol(const char * text) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
436 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
437 char * ret; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
438 int len, pos; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
439 int i; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
440 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
441 len = strlen(text); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
442 ret = m_malloc(len+1); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
443 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
444 pos = 0; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
445 for (i = 0; i < len; i++) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
446 if ((text[i] <= '~' && text[i] >= ' ') /* normal printable range */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
447 || text[i] == '\n' || text[i] == '\r' || text[i] == '\t') { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
448 ret[pos] = text[i]; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
449 pos++; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
450 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
451 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
452 ret[pos] = 0x0; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
453 return ret; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
454 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
455 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
456 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
457 /* reads the contents of filename into the buffer buf, from the current |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
458 * position, either to the end of the file, or the buffer being full. |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
459 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
460 int buf_readfile(buffer* buf, const char* filename) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
461 |
357
9e2ad1023978
Handle failure reading a file (such as a key file)
Matt Johnston <matt@ucc.asn.au>
parents:
335
diff
changeset
|
462 int fd = -1; |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
463 int len; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
464 int maxlen; |
358
e81d3bc1dc78
Forgot variable declaration.
Matt Johnston <matt@ucc.asn.au>
parents:
357
diff
changeset
|
465 int ret = DROPBEAR_FAILURE; |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
466 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
467 fd = open(filename, O_RDONLY); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
468 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
469 if (fd < 0) { |
357
9e2ad1023978
Handle failure reading a file (such as a key file)
Matt Johnston <matt@ucc.asn.au>
parents:
335
diff
changeset
|
470 goto out; |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
471 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
472 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
473 do { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
474 maxlen = buf->size - buf->pos; |
357
9e2ad1023978
Handle failure reading a file (such as a key file)
Matt Johnston <matt@ucc.asn.au>
parents:
335
diff
changeset
|
475 len = read(fd, buf_getwriteptr(buf, maxlen), maxlen); |
9e2ad1023978
Handle failure reading a file (such as a key file)
Matt Johnston <matt@ucc.asn.au>
parents:
335
diff
changeset
|
476 if (len < 0) { |
9e2ad1023978
Handle failure reading a file (such as a key file)
Matt Johnston <matt@ucc.asn.au>
parents:
335
diff
changeset
|
477 if (errno == EINTR || errno == EAGAIN) { |
9e2ad1023978
Handle failure reading a file (such as a key file)
Matt Johnston <matt@ucc.asn.au>
parents:
335
diff
changeset
|
478 continue; |
9e2ad1023978
Handle failure reading a file (such as a key file)
Matt Johnston <matt@ucc.asn.au>
parents:
335
diff
changeset
|
479 } |
9e2ad1023978
Handle failure reading a file (such as a key file)
Matt Johnston <matt@ucc.asn.au>
parents:
335
diff
changeset
|
480 goto out; |
9e2ad1023978
Handle failure reading a file (such as a key file)
Matt Johnston <matt@ucc.asn.au>
parents:
335
diff
changeset
|
481 } |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
482 buf_incrwritepos(buf, len); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
483 } while (len < maxlen && len > 0); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
484 |
357
9e2ad1023978
Handle failure reading a file (such as a key file)
Matt Johnston <matt@ucc.asn.au>
parents:
335
diff
changeset
|
485 ret = DROPBEAR_SUCCESS; |
9e2ad1023978
Handle failure reading a file (such as a key file)
Matt Johnston <matt@ucc.asn.au>
parents:
335
diff
changeset
|
486 |
9e2ad1023978
Handle failure reading a file (such as a key file)
Matt Johnston <matt@ucc.asn.au>
parents:
335
diff
changeset
|
487 out: |
9e2ad1023978
Handle failure reading a file (such as a key file)
Matt Johnston <matt@ucc.asn.au>
parents:
335
diff
changeset
|
488 if (fd >= 0) { |
9e2ad1023978
Handle failure reading a file (such as a key file)
Matt Johnston <matt@ucc.asn.au>
parents:
335
diff
changeset
|
489 m_close(fd); |
9e2ad1023978
Handle failure reading a file (such as a key file)
Matt Johnston <matt@ucc.asn.au>
parents:
335
diff
changeset
|
490 } |
9e2ad1023978
Handle failure reading a file (such as a key file)
Matt Johnston <matt@ucc.asn.au>
parents:
335
diff
changeset
|
491 return ret; |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
492 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
493 |
51
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
494 /* get a line from the file into buffer in the style expected for an |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
495 * authkeys file. |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
496 * Will return DROPBEAR_SUCCESS if data is read, or DROPBEAR_FAILURE on EOF.*/ |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
497 /* Only used for ~/.ssh/known_hosts and ~/.ssh/authorized_keys */ |
1295
750ec4ec4cbe
Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents:
1283
diff
changeset
|
498 #if DROPBEAR_CLIENT || DROPBEAR_SVR_PUBKEY_AUTH |
51
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
499 int buf_getline(buffer * line, FILE * authfile) { |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
500 |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
501 int c = EOF; |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
502 |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
503 buf_setpos(line, 0); |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
504 buf_setlen(line, 0); |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
505 |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
506 while (line->pos < line->size) { |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
507 |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
508 c = fgetc(authfile); /*getc() is weird with some uClibc systems*/ |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
509 if (c == EOF || c == '\n' || c == '\r') { |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
510 goto out; |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
511 } |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
512 |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
513 buf_putbyte(line, (unsigned char)c); |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
514 } |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
515 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
161
diff
changeset
|
516 TRACE(("leave getauthline: line too long")) |
51
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
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45
diff
changeset
|
517 /* We return success, but the line length will be zeroed - ie we just |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
518 * ignore that line */ |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
changeset
|
519 buf_setlen(line, 0); |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
520 |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
521 out: |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
522 |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
523 |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
524 /* if we didn't read anything before EOF or error, exit */ |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
525 if (c == EOF && line->pos == 0) { |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
526 return DROPBEAR_FAILURE; |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
527 } else { |
117
e0acad552a92
Read the last line of a file without a finishing '\n' correctly
Matt Johnston <matt@ucc.asn.au>
parents:
109
diff
changeset
|
528 buf_setpos(line, 0); |
51
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
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parents:
45
diff
changeset
|
529 return DROPBEAR_SUCCESS; |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
530 } |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
531 |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
532 } |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
533 #endif |
095d689fed16
- Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents:
45
diff
changeset
|
534 |
277
044bc108b9b3
* Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
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258
diff
changeset
|
535 /* make sure that the socket closes */ |
044bc108b9b3
* Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents:
258
diff
changeset
|
536 void m_close(int fd) { |
1038
d3925ed45a85
Fix for old compilers, variable declarations at beginning of functions
Thorsten Horstmann <thorsten.horstmann@web.de>
parents:
1022
diff
changeset
|
537 int val; |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
538 |
1453
336cae2238ca
test close < 0, from Marco Wenzel
Matt Johnston <matt@ucc.asn.au>
parents:
1343
diff
changeset
|
539 if (fd < 0) { |
883
ff597bf2cfb0
DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default
Matt Johnston <matt@ucc.asn.au>
parents:
871
diff
changeset
|
540 return; |
ff597bf2cfb0
DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default
Matt Johnston <matt@ucc.asn.au>
parents:
871
diff
changeset
|
541 } |
ff597bf2cfb0
DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default
Matt Johnston <matt@ucc.asn.au>
parents:
871
diff
changeset
|
542 |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
543 do { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
544 val = close(fd); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
545 } while (val < 0 && errno == EINTR); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
546 |
277
044bc108b9b3
* Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents:
258
diff
changeset
|
547 if (val < 0 && errno != EBADF) { |
044bc108b9b3
* Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents:
258
diff
changeset
|
548 /* Linux says EIO can happen */ |
044bc108b9b3
* Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents:
258
diff
changeset
|
549 dropbear_exit("Error closing fd %d, %s", fd, strerror(errno)); |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
550 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
551 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
552 |
109
2e9d1f29c50f
merge of 50be59810e462f9f44f55e421227d6aa0b31982b
Matt Johnston <matt@ucc.asn.au>
parents:
108
diff
changeset
|
553 void setnonblocking(int fd) { |
2e9d1f29c50f
merge of 50be59810e462f9f44f55e421227d6aa0b31982b
Matt Johnston <matt@ucc.asn.au>
parents:
108
diff
changeset
|
554 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
161
diff
changeset
|
555 TRACE(("setnonblocking: %d", fd)) |
109
2e9d1f29c50f
merge of 50be59810e462f9f44f55e421227d6aa0b31982b
Matt Johnston <matt@ucc.asn.au>
parents:
108
diff
changeset
|
556 |
1558
2f64cb3d3007
- #if not #ifdef for DROPBEAR_FUZZ
Matt Johnston <matt@ucc.asn.au>
parents:
1511
diff
changeset
|
557 #if DROPBEAR_FUZZ |
1383
f03cfe9c76ac
Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents:
1375
diff
changeset
|
558 if (fuzz.fuzzing) { |
f03cfe9c76ac
Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents:
1375
diff
changeset
|
559 return; |
f03cfe9c76ac
Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents:
1375
diff
changeset
|
560 } |
f03cfe9c76ac
Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents:
1375
diff
changeset
|
561 #endif |
f03cfe9c76ac
Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents:
1375
diff
changeset
|
562 |
109
2e9d1f29c50f
merge of 50be59810e462f9f44f55e421227d6aa0b31982b
Matt Johnston <matt@ucc.asn.au>
parents:
108
diff
changeset
|
563 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) { |
173
257f09a63dab
* add SSH_ASKPASS support (based on patch from Paul Whittaker
Matt Johnston <matt@ucc.asn.au>
parents:
172
diff
changeset
|
564 if (errno == ENODEV) { |
257f09a63dab
* add SSH_ASKPASS support (based on patch from Paul Whittaker
Matt Johnston <matt@ucc.asn.au>
parents:
172
diff
changeset
|
565 /* Some devices (like /dev/null redirected in) |
257f09a63dab
* add SSH_ASKPASS support (based on patch from Paul Whittaker
Matt Johnston <matt@ucc.asn.au>
parents:
172
diff
changeset
|
566 * can't be set to non-blocking */ |
257f09a63dab
* add SSH_ASKPASS support (based on patch from Paul Whittaker
Matt Johnston <matt@ucc.asn.au>
parents:
172
diff
changeset
|
567 TRACE(("ignoring ENODEV for setnonblocking")) |
257f09a63dab
* add SSH_ASKPASS support (based on patch from Paul Whittaker
Matt Johnston <matt@ucc.asn.au>
parents:
172
diff
changeset
|
568 } else { |
1383
f03cfe9c76ac
Disable setnonblocking(), get_socket_address(), set_sock_priority()
Matt Johnston <matt@ucc.asn.au>
parents:
1375
diff
changeset
|
569 { |
173
257f09a63dab
* add SSH_ASKPASS support (based on patch from Paul Whittaker
Matt Johnston <matt@ucc.asn.au>
parents:
172
diff
changeset
|
570 dropbear_exit("Couldn't set nonblocking"); |
257f09a63dab
* add SSH_ASKPASS support (based on patch from Paul Whittaker
Matt Johnston <matt@ucc.asn.au>
parents:
172
diff
changeset
|
571 } |
257f09a63dab
* add SSH_ASKPASS support (based on patch from Paul Whittaker
Matt Johnston <matt@ucc.asn.au>
parents:
172
diff
changeset
|
572 } |
109
2e9d1f29c50f
merge of 50be59810e462f9f44f55e421227d6aa0b31982b
Matt Johnston <matt@ucc.asn.au>
parents:
108
diff
changeset
|
573 } |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
161
diff
changeset
|
574 TRACE(("leave setnonblocking")) |
109
2e9d1f29c50f
merge of 50be59810e462f9f44f55e421227d6aa0b31982b
Matt Johnston <matt@ucc.asn.au>
parents:
108
diff
changeset
|
575 } |
425 | 576 |
577 void disallow_core() { | |
578 struct rlimit lim; | |
579 lim.rlim_cur = lim.rlim_max = 0; | |
580 setrlimit(RLIMIT_CORE, &lim); | |
581 } | |
492
b956d6151600
Replace calls to strtoul() with a helper m_str_to_uint()
Matt Johnston <matt@ucc.asn.au>
parents:
490
diff
changeset
|
582 |
b956d6151600
Replace calls to strtoul() with a helper m_str_to_uint()
Matt Johnston <matt@ucc.asn.au>
parents:
490
diff
changeset
|
583 /* Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE, with the result in *val */ |
b956d6151600
Replace calls to strtoul() with a helper m_str_to_uint()
Matt Johnston <matt@ucc.asn.au>
parents:
490
diff
changeset
|
584 int m_str_to_uint(const char* str, unsigned int *val) { |
864 | 585 unsigned long l; |
492
b956d6151600
Replace calls to strtoul() with a helper m_str_to_uint()
Matt Johnston <matt@ucc.asn.au>
parents:
490
diff
changeset
|
586 errno = 0; |
864 | 587 l = strtoul(str, NULL, 10); |
492
b956d6151600
Replace calls to strtoul() with a helper m_str_to_uint()
Matt Johnston <matt@ucc.asn.au>
parents:
490
diff
changeset
|
588 /* The c99 spec doesn't actually seem to define EINVAL, but most platforms |
b956d6151600
Replace calls to strtoul() with a helper m_str_to_uint()
Matt Johnston <matt@ucc.asn.au>
parents:
490
diff
changeset
|
589 * I've looked at mention it in their manpage */ |
864 | 590 if ((l == 0 && errno == EINVAL) |
591 || (l == ULONG_MAX && errno == ERANGE) | |
592 || (l > UINT_MAX)) { | |
492
b956d6151600
Replace calls to strtoul() with a helper m_str_to_uint()
Matt Johnston <matt@ucc.asn.au>
parents:
490
diff
changeset
|
593 return DROPBEAR_FAILURE; |
b956d6151600
Replace calls to strtoul() with a helper m_str_to_uint()
Matt Johnston <matt@ucc.asn.au>
parents:
490
diff
changeset
|
594 } else { |
864 | 595 *val = l; |
492
b956d6151600
Replace calls to strtoul() with a helper m_str_to_uint()
Matt Johnston <matt@ucc.asn.au>
parents:
490
diff
changeset
|
596 return DROPBEAR_SUCCESS; |
b956d6151600
Replace calls to strtoul() with a helper m_str_to_uint()
Matt Johnston <matt@ucc.asn.au>
parents:
490
diff
changeset
|
597 } |
b956d6151600
Replace calls to strtoul() with a helper m_str_to_uint()
Matt Johnston <matt@ucc.asn.au>
parents:
490
diff
changeset
|
598 } |
817
a625f9e135a4
Constant time memcmp for the hmac and password crypt
Matt Johnston <matt@ucc.asn.au>
parents:
753
diff
changeset
|
599 |
1134
36557295418e
change DROPBEAR_DEFAULT_CLI_AUTHKEY to just prepend homedir
Matt Johnston <matt@ucc.asn.au>
parents:
1049
diff
changeset
|
600 /* Returns malloced path. inpath beginning with '/' is returned as-is, |
36557295418e
change DROPBEAR_DEFAULT_CLI_AUTHKEY to just prepend homedir
Matt Johnston <matt@ucc.asn.au>
parents:
1049
diff
changeset
|
601 otherwise home directory is prepended */ |
36557295418e
change DROPBEAR_DEFAULT_CLI_AUTHKEY to just prepend homedir
Matt Johnston <matt@ucc.asn.au>
parents:
1049
diff
changeset
|
602 char * expand_homedir_path(const char *inpath) { |
995
6fb4c010c448
Default client key path ~/.ssh/id_dropbear
Matt Johnston <matt@ucc.asn.au>
parents:
962
diff
changeset
|
603 struct passwd *pw = NULL; |
1134
36557295418e
change DROPBEAR_DEFAULT_CLI_AUTHKEY to just prepend homedir
Matt Johnston <matt@ucc.asn.au>
parents:
1049
diff
changeset
|
604 if (inpath[0] != '/') { |
995
6fb4c010c448
Default client key path ~/.ssh/id_dropbear
Matt Johnston <matt@ucc.asn.au>
parents:
962
diff
changeset
|
605 pw = getpwuid(getuid()); |
6fb4c010c448
Default client key path ~/.ssh/id_dropbear
Matt Johnston <matt@ucc.asn.au>
parents:
962
diff
changeset
|
606 if (pw && pw->pw_dir) { |
1134
36557295418e
change DROPBEAR_DEFAULT_CLI_AUTHKEY to just prepend homedir
Matt Johnston <matt@ucc.asn.au>
parents:
1049
diff
changeset
|
607 int len = strlen(inpath) + strlen(pw->pw_dir) + 2; |
995
6fb4c010c448
Default client key path ~/.ssh/id_dropbear
Matt Johnston <matt@ucc.asn.au>
parents:
962
diff
changeset
|
608 char *buf = m_malloc(len); |
1134
36557295418e
change DROPBEAR_DEFAULT_CLI_AUTHKEY to just prepend homedir
Matt Johnston <matt@ucc.asn.au>
parents:
1049
diff
changeset
|
609 snprintf(buf, len, "%s/%s", pw->pw_dir, inpath); |
995
6fb4c010c448
Default client key path ~/.ssh/id_dropbear
Matt Johnston <matt@ucc.asn.au>
parents:
962
diff
changeset
|
610 return buf; |
6fb4c010c448
Default client key path ~/.ssh/id_dropbear
Matt Johnston <matt@ucc.asn.au>
parents:
962
diff
changeset
|
611 } |
6fb4c010c448
Default client key path ~/.ssh/id_dropbear
Matt Johnston <matt@ucc.asn.au>
parents:
962
diff
changeset
|
612 } |
6fb4c010c448
Default client key path ~/.ssh/id_dropbear
Matt Johnston <matt@ucc.asn.au>
parents:
962
diff
changeset
|
613 |
6fb4c010c448
Default client key path ~/.ssh/id_dropbear
Matt Johnston <matt@ucc.asn.au>
parents:
962
diff
changeset
|
614 /* Fallback */ |
6fb4c010c448
Default client key path ~/.ssh/id_dropbear
Matt Johnston <matt@ucc.asn.au>
parents:
962
diff
changeset
|
615 return m_strdup(inpath); |
6fb4c010c448
Default client key path ~/.ssh/id_dropbear
Matt Johnston <matt@ucc.asn.au>
parents:
962
diff
changeset
|
616 } |
6fb4c010c448
Default client key path ~/.ssh/id_dropbear
Matt Johnston <matt@ucc.asn.au>
parents:
962
diff
changeset
|
617 |
817
a625f9e135a4
Constant time memcmp for the hmac and password crypt
Matt Johnston <matt@ucc.asn.au>
parents:
753
diff
changeset
|
618 int constant_time_memcmp(const void* a, const void *b, size_t n) |
a625f9e135a4
Constant time memcmp for the hmac and password crypt
Matt Johnston <matt@ucc.asn.au>
parents:
753
diff
changeset
|
619 { |
a625f9e135a4
Constant time memcmp for the hmac and password crypt
Matt Johnston <matt@ucc.asn.au>
parents:
753
diff
changeset
|
620 const char *xa = a, *xb = b; |
a625f9e135a4
Constant time memcmp for the hmac and password crypt
Matt Johnston <matt@ucc.asn.au>
parents:
753
diff
changeset
|
621 uint8_t c = 0; |
a625f9e135a4
Constant time memcmp for the hmac and password crypt
Matt Johnston <matt@ucc.asn.au>
parents:
753
diff
changeset
|
622 size_t i; |
a625f9e135a4
Constant time memcmp for the hmac and password crypt
Matt Johnston <matt@ucc.asn.au>
parents:
753
diff
changeset
|
623 for (i = 0; i < n; i++) |
a625f9e135a4
Constant time memcmp for the hmac and password crypt
Matt Johnston <matt@ucc.asn.au>
parents:
753
diff
changeset
|
624 { |
a625f9e135a4
Constant time memcmp for the hmac and password crypt
Matt Johnston <matt@ucc.asn.au>
parents:
753
diff
changeset
|
625 c |= (xa[i] ^ xb[i]); |
a625f9e135a4
Constant time memcmp for the hmac and password crypt
Matt Johnston <matt@ucc.asn.au>
parents:
753
diff
changeset
|
626 } |
a625f9e135a4
Constant time memcmp for the hmac and password crypt
Matt Johnston <matt@ucc.asn.au>
parents:
753
diff
changeset
|
627 return c; |
a625f9e135a4
Constant time memcmp for the hmac and password crypt
Matt Johnston <matt@ucc.asn.au>
parents:
753
diff
changeset
|
628 } |
a625f9e135a4
Constant time memcmp for the hmac and password crypt
Matt Johnston <matt@ucc.asn.au>
parents:
753
diff
changeset
|
629 |
1622
e11ed628708b
- Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents:
1575
diff
changeset
|
630 /* higher-resolution monotonic timestamp, falls back to gettimeofday */ |
e11ed628708b
- Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents:
1575
diff
changeset
|
631 void gettime_wrapper(struct timespec *now) { |
e11ed628708b
- Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents:
1575
diff
changeset
|
632 struct timeval tv; |
1558
2f64cb3d3007
- #if not #ifdef for DROPBEAR_FUZZ
Matt Johnston <matt@ucc.asn.au>
parents:
1511
diff
changeset
|
633 #if DROPBEAR_FUZZ |
1375
d8215479a58a
fuzzing has a constant time
Matt Johnston <matt@ucc.asn.au>
parents:
1369
diff
changeset
|
634 if (fuzz.fuzzing) { |
d8215479a58a
fuzzing has a constant time
Matt Johnston <matt@ucc.asn.au>
parents:
1369
diff
changeset
|
635 /* time stands still when fuzzing */ |
1622
e11ed628708b
- Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents:
1575
diff
changeset
|
636 now->tv_sec = 5; |
e11ed628708b
- Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents:
1575
diff
changeset
|
637 now->tv_nsec = 0; |
1375
d8215479a58a
fuzzing has a constant time
Matt Johnston <matt@ucc.asn.au>
parents:
1369
diff
changeset
|
638 } |
d8215479a58a
fuzzing has a constant time
Matt Johnston <matt@ucc.asn.au>
parents:
1369
diff
changeset
|
639 #endif |
1622
e11ed628708b
- Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents:
1575
diff
changeset
|
640 |
e11ed628708b
- Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents:
1575
diff
changeset
|
641 #if defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_MONOTONIC) |
e11ed628708b
- Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents:
1575
diff
changeset
|
642 /* POSIX monotonic clock. Newer Linux, BSD, MacOSX >10.12 */ |
e11ed628708b
- Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents:
1575
diff
changeset
|
643 if (clock_gettime(CLOCK_MONOTONIC, now) == 0) { |
e11ed628708b
- Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents:
1575
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644 return; |
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645 } |
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646 #endif |
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647 |
952 | 648 #if defined(__linux__) && defined(SYS_clock_gettime) |
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649 { |
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650 /* Old linux toolchain - kernel might support it but not the build headers */ |
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651 /* Also glibc <2.17 requires -lrt which we neglect to add */ |
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652 static int linux_monotonic_failed = 0; |
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653 if (!linux_monotonic_failed) { |
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654 /* CLOCK_MONOTONIC isn't in some headers */ |
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655 int clock_source_monotonic = 1; |
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656 if (syscall(SYS_clock_gettime, clock_source_monotonic, now) == 0) { |
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657 return; |
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658 } else { |
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659 /* Don't try again */ |
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660 linux_monotonic_failed = 1; |
952 | 661 } |
662 } | |
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663 } |
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664 #endif /* linux fallback clock_gettime */ |
952 | 665 |
666 #if defined(HAVE_MACH_ABSOLUTE_TIME) | |
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667 { |
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668 /* OS X pre 10.12, see https://developer.apple.com/library/mac/qa/qa1398/_index.html */ |
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669 static mach_timebase_info_data_t timebase_info; |
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670 uint64_t scaled_time; |
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671 if (timebase_info.denom == 0) { |
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672 mach_timebase_info(&timebase_info); |
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673 } |
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674 scaled_time = mach_absolute_time() * timebase_info.numer / timebase_info.denom; |
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675 now->tv_sec = scaled_time / 1000000000; |
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676 now->tv_nsec = scaled_time % 1000000000; |
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677 } |
952 | 678 #endif /* osx mach_absolute_time */ |
679 | |
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680 /* Fallback for everything else - this will sometimes go backwards */ |
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681 gettimeofday(&tv, NULL); |
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682 now->tv_sec = tv.tv_sec; |
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683 now->tv_nsec = 1000*tv.tv_usec; |
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684 } |
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685 |
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686 /* second-resolution monotonic timestamp */ |
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687 time_t monotonic_now() { |
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688 struct timespec ts; |
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689 gettime_wrapper(&ts); |
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690 return ts.tv_sec; |
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691 } |
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692 |
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693 void fsync_parent_dir(const char* fn) { |
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694 #ifdef HAVE_LIBGEN_H |
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695 char *fn_dir = m_strdup(fn); |
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696 char *dir = dirname(fn_dir); |
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697 int dirfd = open(dir, O_RDONLY); |
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698 |
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699 if (dirfd != -1) { |
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700 if (fsync(dirfd) != 0) { |
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701 TRACE(("fsync of directory %s failed: %s", dir, strerror(errno))) |
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702 } |
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703 m_close(dirfd); |
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704 } else { |
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705 TRACE(("error opening directory %s for fsync: %s", dir, strerror(errno))) |
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706 } |
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707 |
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708 m_free(fn_dir); |
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709 #endif |
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710 } |